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tracing: Prevent buffer overwrite disabled for latency tracers
[deliverable/linux.git] / kernel / sysctl.c
1 /*
2 * sysctl.c: General linux system control interface
3 *
4 * Begun 24 March 1995, Stephen Tweedie
5 * Added /proc support, Dec 1995
6 * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas.
7 * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver.
8 * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver.
9 * Dynamic registration fixes, Stephen Tweedie.
10 * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn.
11 * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris
12 * Horn.
13 * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer.
14 * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer.
15 * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill
16 * Wendling.
17 * The list_for_each() macro wasn't appropriate for the sysctl loop.
18 * Removed it and replaced it with older style, 03/23/00, Bill Wendling
19 */
20
21 #include <linux/module.h>
22 #include <linux/mm.h>
23 #include <linux/swap.h>
24 #include <linux/slab.h>
25 #include <linux/sysctl.h>
26 #include <linux/bitmap.h>
27 #include <linux/signal.h>
28 #include <linux/printk.h>
29 #include <linux/proc_fs.h>
30 #include <linux/security.h>
31 #include <linux/ctype.h>
32 #include <linux/kmemcheck.h>
33 #include <linux/kmemleak.h>
34 #include <linux/fs.h>
35 #include <linux/init.h>
36 #include <linux/kernel.h>
37 #include <linux/kobject.h>
38 #include <linux/net.h>
39 #include <linux/sysrq.h>
40 #include <linux/highuid.h>
41 #include <linux/writeback.h>
42 #include <linux/ratelimit.h>
43 #include <linux/compaction.h>
44 #include <linux/hugetlb.h>
45 #include <linux/initrd.h>
46 #include <linux/key.h>
47 #include <linux/times.h>
48 #include <linux/limits.h>
49 #include <linux/dcache.h>
50 #include <linux/dnotify.h>
51 #include <linux/syscalls.h>
52 #include <linux/vmstat.h>
53 #include <linux/nfs_fs.h>
54 #include <linux/acpi.h>
55 #include <linux/reboot.h>
56 #include <linux/ftrace.h>
57 #include <linux/perf_event.h>
58 #include <linux/kprobes.h>
59 #include <linux/pipe_fs_i.h>
60 #include <linux/oom.h>
61 #include <linux/kmod.h>
62 #include <linux/capability.h>
63 #include <linux/binfmts.h>
64 #include <linux/sched/sysctl.h>
65
66 #include <asm/uaccess.h>
67 #include <asm/processor.h>
68
69 #ifdef CONFIG_X86
70 #include <asm/nmi.h>
71 #include <asm/stacktrace.h>
72 #include <asm/io.h>
73 #endif
74 #ifdef CONFIG_SPARC
75 #include <asm/setup.h>
76 #endif
77 #ifdef CONFIG_BSD_PROCESS_ACCT
78 #include <linux/acct.h>
79 #endif
80 #ifdef CONFIG_RT_MUTEXES
81 #include <linux/rtmutex.h>
82 #endif
83 #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
84 #include <linux/lockdep.h>
85 #endif
86 #ifdef CONFIG_CHR_DEV_SG
87 #include <scsi/sg.h>
88 #endif
89
90 #ifdef CONFIG_LOCKUP_DETECTOR
91 #include <linux/nmi.h>
92 #endif
93
94
95 #if defined(CONFIG_SYSCTL)
96
97 /* External variables not in a header file. */
98 extern int sysctl_overcommit_memory;
99 extern int sysctl_overcommit_ratio;
100 extern int max_threads;
101 extern int suid_dumpable;
102 #ifdef CONFIG_COREDUMP
103 extern int core_uses_pid;
104 extern char core_pattern[];
105 extern unsigned int core_pipe_limit;
106 #endif
107 extern int pid_max;
108 extern int 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 no_unaligned_warning;
166 extern int unaligned_dump_stack;
167 #endif
168
169 #ifdef CONFIG_PROC_SYSCTL
170 static int proc_do_cad_pid(struct ctl_table *table, int write,
171 void __user *buffer, size_t *lenp, loff_t *ppos);
172 static int proc_taint(struct ctl_table *table, int write,
173 void __user *buffer, size_t *lenp, loff_t *ppos);
174 #endif
175
176 #ifdef CONFIG_PRINTK
177 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
178 void __user *buffer, size_t *lenp, loff_t *ppos);
179 #endif
180
181 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
182 void __user *buffer, size_t *lenp, loff_t *ppos);
183 #ifdef CONFIG_COREDUMP
184 static int proc_dostring_coredump(struct ctl_table *table, int write,
185 void __user *buffer, size_t *lenp, loff_t *ppos);
186 #endif
187
188 #ifdef CONFIG_MAGIC_SYSRQ
189 /* Note: sysrq code uses it's own private copy */
190 static int __sysrq_enabled = SYSRQ_DEFAULT_ENABLE;
191
192 static int sysrq_sysctl_handler(ctl_table *table, int write,
193 void __user *buffer, size_t *lenp,
194 loff_t *ppos)
195 {
196 int error;
197
198 error = proc_dointvec(table, write, buffer, lenp, ppos);
199 if (error)
200 return error;
201
202 if (write)
203 sysrq_toggle_support(__sysrq_enabled);
204
205 return 0;
206 }
207
208 #endif
209
210 static struct ctl_table kern_table[];
211 static struct ctl_table vm_table[];
212 static struct ctl_table fs_table[];
213 static struct ctl_table debug_table[];
214 static struct ctl_table dev_table[];
215 extern struct ctl_table random_table[];
216 #ifdef CONFIG_EPOLL
217 extern struct ctl_table epoll_table[];
218 #endif
219
220 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
221 int sysctl_legacy_va_layout;
222 #endif
223
224 /* The default sysctl tables: */
225
226 static struct ctl_table sysctl_base_table[] = {
227 {
228 .procname = "kernel",
229 .mode = 0555,
230 .child = kern_table,
231 },
232 {
233 .procname = "vm",
234 .mode = 0555,
235 .child = vm_table,
236 },
237 {
238 .procname = "fs",
239 .mode = 0555,
240 .child = fs_table,
241 },
242 {
243 .procname = "debug",
244 .mode = 0555,
245 .child = debug_table,
246 },
247 {
248 .procname = "dev",
249 .mode = 0555,
250 .child = dev_table,
251 },
252 { }
253 };
254
255 #ifdef CONFIG_SCHED_DEBUG
256 static int min_sched_granularity_ns = 100000; /* 100 usecs */
257 static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */
258 static int min_wakeup_granularity_ns; /* 0 usecs */
259 static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */
260 #ifdef CONFIG_SMP
261 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
262 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
263 #endif /* CONFIG_SMP */
264 #endif /* CONFIG_SCHED_DEBUG */
265
266 #ifdef CONFIG_COMPACTION
267 static int min_extfrag_threshold;
268 static int max_extfrag_threshold = 1000;
269 #endif
270
271 static struct ctl_table kern_table[] = {
272 {
273 .procname = "sched_child_runs_first",
274 .data = &sysctl_sched_child_runs_first,
275 .maxlen = sizeof(unsigned int),
276 .mode = 0644,
277 .proc_handler = proc_dointvec,
278 },
279 #ifdef CONFIG_SCHED_DEBUG
280 {
281 .procname = "sched_min_granularity_ns",
282 .data = &sysctl_sched_min_granularity,
283 .maxlen = sizeof(unsigned int),
284 .mode = 0644,
285 .proc_handler = sched_proc_update_handler,
286 .extra1 = &min_sched_granularity_ns,
287 .extra2 = &max_sched_granularity_ns,
288 },
289 {
290 .procname = "sched_latency_ns",
291 .data = &sysctl_sched_latency,
292 .maxlen = sizeof(unsigned int),
293 .mode = 0644,
294 .proc_handler = sched_proc_update_handler,
295 .extra1 = &min_sched_granularity_ns,
296 .extra2 = &max_sched_granularity_ns,
297 },
298 {
299 .procname = "sched_wakeup_granularity_ns",
300 .data = &sysctl_sched_wakeup_granularity,
301 .maxlen = sizeof(unsigned int),
302 .mode = 0644,
303 .proc_handler = sched_proc_update_handler,
304 .extra1 = &min_wakeup_granularity_ns,
305 .extra2 = &max_wakeup_granularity_ns,
306 },
307 #ifdef CONFIG_SMP
308 {
309 .procname = "sched_tunable_scaling",
310 .data = &sysctl_sched_tunable_scaling,
311 .maxlen = sizeof(enum sched_tunable_scaling),
312 .mode = 0644,
313 .proc_handler = sched_proc_update_handler,
314 .extra1 = &min_sched_tunable_scaling,
315 .extra2 = &max_sched_tunable_scaling,
316 },
317 {
318 .procname = "sched_migration_cost_ns",
319 .data = &sysctl_sched_migration_cost,
320 .maxlen = sizeof(unsigned int),
321 .mode = 0644,
322 .proc_handler = proc_dointvec,
323 },
324 {
325 .procname = "sched_nr_migrate",
326 .data = &sysctl_sched_nr_migrate,
327 .maxlen = sizeof(unsigned int),
328 .mode = 0644,
329 .proc_handler = proc_dointvec,
330 },
331 {
332 .procname = "sched_time_avg_ms",
333 .data = &sysctl_sched_time_avg,
334 .maxlen = sizeof(unsigned int),
335 .mode = 0644,
336 .proc_handler = proc_dointvec,
337 },
338 {
339 .procname = "sched_shares_window_ns",
340 .data = &sysctl_sched_shares_window,
341 .maxlen = sizeof(unsigned int),
342 .mode = 0644,
343 .proc_handler = proc_dointvec,
344 },
345 {
346 .procname = "timer_migration",
347 .data = &sysctl_timer_migration,
348 .maxlen = sizeof(unsigned int),
349 .mode = 0644,
350 .proc_handler = proc_dointvec_minmax,
351 .extra1 = &zero,
352 .extra2 = &one,
353 },
354 #endif /* CONFIG_SMP */
355 #ifdef CONFIG_NUMA_BALANCING
356 {
357 .procname = "numa_balancing_scan_delay_ms",
358 .data = &sysctl_numa_balancing_scan_delay,
359 .maxlen = sizeof(unsigned int),
360 .mode = 0644,
361 .proc_handler = proc_dointvec,
362 },
363 {
364 .procname = "numa_balancing_scan_period_min_ms",
365 .data = &sysctl_numa_balancing_scan_period_min,
366 .maxlen = sizeof(unsigned int),
367 .mode = 0644,
368 .proc_handler = proc_dointvec,
369 },
370 {
371 .procname = "numa_balancing_scan_period_reset",
372 .data = &sysctl_numa_balancing_scan_period_reset,
373 .maxlen = sizeof(unsigned int),
374 .mode = 0644,
375 .proc_handler = proc_dointvec,
376 },
377 {
378 .procname = "numa_balancing_scan_period_max_ms",
379 .data = &sysctl_numa_balancing_scan_period_max,
380 .maxlen = sizeof(unsigned int),
381 .mode = 0644,
382 .proc_handler = proc_dointvec,
383 },
384 {
385 .procname = "numa_balancing_scan_size_mb",
386 .data = &sysctl_numa_balancing_scan_size,
387 .maxlen = sizeof(unsigned int),
388 .mode = 0644,
389 .proc_handler = proc_dointvec,
390 },
391 #endif /* CONFIG_NUMA_BALANCING */
392 #endif /* CONFIG_SCHED_DEBUG */
393 {
394 .procname = "sched_rt_period_us",
395 .data = &sysctl_sched_rt_period,
396 .maxlen = sizeof(unsigned int),
397 .mode = 0644,
398 .proc_handler = sched_rt_handler,
399 },
400 {
401 .procname = "sched_rt_runtime_us",
402 .data = &sysctl_sched_rt_runtime,
403 .maxlen = sizeof(int),
404 .mode = 0644,
405 .proc_handler = sched_rt_handler,
406 },
407 {
408 .procname = "sched_rr_timeslice_ms",
409 .data = &sched_rr_timeslice,
410 .maxlen = sizeof(int),
411 .mode = 0644,
412 .proc_handler = sched_rr_handler,
413 },
414 #ifdef CONFIG_SCHED_AUTOGROUP
415 {
416 .procname = "sched_autogroup_enabled",
417 .data = &sysctl_sched_autogroup_enabled,
418 .maxlen = sizeof(unsigned int),
419 .mode = 0644,
420 .proc_handler = proc_dointvec_minmax,
421 .extra1 = &zero,
422 .extra2 = &one,
423 },
424 #endif
425 #ifdef CONFIG_CFS_BANDWIDTH
426 {
427 .procname = "sched_cfs_bandwidth_slice_us",
428 .data = &sysctl_sched_cfs_bandwidth_slice,
429 .maxlen = sizeof(unsigned int),
430 .mode = 0644,
431 .proc_handler = proc_dointvec_minmax,
432 .extra1 = &one,
433 },
434 #endif
435 #ifdef CONFIG_PROVE_LOCKING
436 {
437 .procname = "prove_locking",
438 .data = &prove_locking,
439 .maxlen = sizeof(int),
440 .mode = 0644,
441 .proc_handler = proc_dointvec,
442 },
443 #endif
444 #ifdef CONFIG_LOCK_STAT
445 {
446 .procname = "lock_stat",
447 .data = &lock_stat,
448 .maxlen = sizeof(int),
449 .mode = 0644,
450 .proc_handler = proc_dointvec,
451 },
452 #endif
453 {
454 .procname = "panic",
455 .data = &panic_timeout,
456 .maxlen = sizeof(int),
457 .mode = 0644,
458 .proc_handler = proc_dointvec,
459 },
460 #ifdef CONFIG_COREDUMP
461 {
462 .procname = "core_uses_pid",
463 .data = &core_uses_pid,
464 .maxlen = sizeof(int),
465 .mode = 0644,
466 .proc_handler = proc_dointvec,
467 },
468 {
469 .procname = "core_pattern",
470 .data = core_pattern,
471 .maxlen = CORENAME_MAX_SIZE,
472 .mode = 0644,
473 .proc_handler = proc_dostring_coredump,
474 },
475 {
476 .procname = "core_pipe_limit",
477 .data = &core_pipe_limit,
478 .maxlen = sizeof(unsigned int),
479 .mode = 0644,
480 .proc_handler = proc_dointvec,
481 },
482 #endif
483 #ifdef CONFIG_PROC_SYSCTL
484 {
485 .procname = "tainted",
486 .maxlen = sizeof(long),
487 .mode = 0644,
488 .proc_handler = proc_taint,
489 },
490 #endif
491 #ifdef CONFIG_LATENCYTOP
492 {
493 .procname = "latencytop",
494 .data = &latencytop_enabled,
495 .maxlen = sizeof(int),
496 .mode = 0644,
497 .proc_handler = proc_dointvec,
498 },
499 #endif
500 #ifdef CONFIG_BLK_DEV_INITRD
501 {
502 .procname = "real-root-dev",
503 .data = &real_root_dev,
504 .maxlen = sizeof(int),
505 .mode = 0644,
506 .proc_handler = proc_dointvec,
507 },
508 #endif
509 {
510 .procname = "print-fatal-signals",
511 .data = &print_fatal_signals,
512 .maxlen = sizeof(int),
513 .mode = 0644,
514 .proc_handler = proc_dointvec,
515 },
516 #ifdef CONFIG_SPARC
517 {
518 .procname = "reboot-cmd",
519 .data = reboot_command,
520 .maxlen = 256,
521 .mode = 0644,
522 .proc_handler = proc_dostring,
523 },
524 {
525 .procname = "stop-a",
526 .data = &stop_a_enabled,
527 .maxlen = sizeof (int),
528 .mode = 0644,
529 .proc_handler = proc_dointvec,
530 },
531 {
532 .procname = "scons-poweroff",
533 .data = &scons_pwroff,
534 .maxlen = sizeof (int),
535 .mode = 0644,
536 .proc_handler = proc_dointvec,
537 },
538 #endif
539 #ifdef CONFIG_SPARC64
540 {
541 .procname = "tsb-ratio",
542 .data = &sysctl_tsb_ratio,
543 .maxlen = sizeof (int),
544 .mode = 0644,
545 .proc_handler = proc_dointvec,
546 },
547 #endif
548 #ifdef __hppa__
549 {
550 .procname = "soft-power",
551 .data = &pwrsw_enabled,
552 .maxlen = sizeof (int),
553 .mode = 0644,
554 .proc_handler = proc_dointvec,
555 },
556 {
557 .procname = "unaligned-trap",
558 .data = &unaligned_enabled,
559 .maxlen = sizeof (int),
560 .mode = 0644,
561 .proc_handler = proc_dointvec,
562 },
563 #endif
564 {
565 .procname = "ctrl-alt-del",
566 .data = &C_A_D,
567 .maxlen = sizeof(int),
568 .mode = 0644,
569 .proc_handler = proc_dointvec,
570 },
571 #ifdef CONFIG_FUNCTION_TRACER
572 {
573 .procname = "ftrace_enabled",
574 .data = &ftrace_enabled,
575 .maxlen = sizeof(int),
576 .mode = 0644,
577 .proc_handler = ftrace_enable_sysctl,
578 },
579 #endif
580 #ifdef CONFIG_STACK_TRACER
581 {
582 .procname = "stack_tracer_enabled",
583 .data = &stack_tracer_enabled,
584 .maxlen = sizeof(int),
585 .mode = 0644,
586 .proc_handler = stack_trace_sysctl,
587 },
588 #endif
589 #ifdef CONFIG_TRACING
590 {
591 .procname = "ftrace_dump_on_oops",
592 .data = &ftrace_dump_on_oops,
593 .maxlen = sizeof(int),
594 .mode = 0644,
595 .proc_handler = proc_dointvec,
596 },
597 #endif
598 #ifdef CONFIG_MODULES
599 {
600 .procname = "modprobe",
601 .data = &modprobe_path,
602 .maxlen = KMOD_PATH_LEN,
603 .mode = 0644,
604 .proc_handler = proc_dostring,
605 },
606 {
607 .procname = "modules_disabled",
608 .data = &modules_disabled,
609 .maxlen = sizeof(int),
610 .mode = 0644,
611 /* only handle a transition from default "0" to "1" */
612 .proc_handler = proc_dointvec_minmax,
613 .extra1 = &one,
614 .extra2 = &one,
615 },
616 #endif
617
618 {
619 .procname = "hotplug",
620 .data = &uevent_helper,
621 .maxlen = UEVENT_HELPER_PATH_LEN,
622 .mode = 0644,
623 .proc_handler = proc_dostring,
624 },
625
626 #ifdef CONFIG_CHR_DEV_SG
627 {
628 .procname = "sg-big-buff",
629 .data = &sg_big_buff,
630 .maxlen = sizeof (int),
631 .mode = 0444,
632 .proc_handler = proc_dointvec,
633 },
634 #endif
635 #ifdef CONFIG_BSD_PROCESS_ACCT
636 {
637 .procname = "acct",
638 .data = &acct_parm,
639 .maxlen = 3*sizeof(int),
640 .mode = 0644,
641 .proc_handler = proc_dointvec,
642 },
643 #endif
644 #ifdef CONFIG_MAGIC_SYSRQ
645 {
646 .procname = "sysrq",
647 .data = &__sysrq_enabled,
648 .maxlen = sizeof (int),
649 .mode = 0644,
650 .proc_handler = sysrq_sysctl_handler,
651 },
652 #endif
653 #ifdef CONFIG_PROC_SYSCTL
654 {
655 .procname = "cad_pid",
656 .data = NULL,
657 .maxlen = sizeof (int),
658 .mode = 0600,
659 .proc_handler = proc_do_cad_pid,
660 },
661 #endif
662 {
663 .procname = "threads-max",
664 .data = &max_threads,
665 .maxlen = sizeof(int),
666 .mode = 0644,
667 .proc_handler = proc_dointvec,
668 },
669 {
670 .procname = "random",
671 .mode = 0555,
672 .child = random_table,
673 },
674 {
675 .procname = "usermodehelper",
676 .mode = 0555,
677 .child = usermodehelper_table,
678 },
679 {
680 .procname = "overflowuid",
681 .data = &overflowuid,
682 .maxlen = sizeof(int),
683 .mode = 0644,
684 .proc_handler = proc_dointvec_minmax,
685 .extra1 = &minolduid,
686 .extra2 = &maxolduid,
687 },
688 {
689 .procname = "overflowgid",
690 .data = &overflowgid,
691 .maxlen = sizeof(int),
692 .mode = 0644,
693 .proc_handler = proc_dointvec_minmax,
694 .extra1 = &minolduid,
695 .extra2 = &maxolduid,
696 },
697 #ifdef CONFIG_S390
698 #ifdef CONFIG_MATHEMU
699 {
700 .procname = "ieee_emulation_warnings",
701 .data = &sysctl_ieee_emulation_warnings,
702 .maxlen = sizeof(int),
703 .mode = 0644,
704 .proc_handler = proc_dointvec,
705 },
706 #endif
707 {
708 .procname = "userprocess_debug",
709 .data = &show_unhandled_signals,
710 .maxlen = sizeof(int),
711 .mode = 0644,
712 .proc_handler = proc_dointvec,
713 },
714 #endif
715 {
716 .procname = "pid_max",
717 .data = &pid_max,
718 .maxlen = sizeof (int),
719 .mode = 0644,
720 .proc_handler = proc_dointvec_minmax,
721 .extra1 = &pid_max_min,
722 .extra2 = &pid_max_max,
723 },
724 {
725 .procname = "panic_on_oops",
726 .data = &panic_on_oops,
727 .maxlen = sizeof(int),
728 .mode = 0644,
729 .proc_handler = proc_dointvec,
730 },
731 #if defined CONFIG_PRINTK
732 {
733 .procname = "printk",
734 .data = &console_loglevel,
735 .maxlen = 4*sizeof(int),
736 .mode = 0644,
737 .proc_handler = proc_dointvec,
738 },
739 {
740 .procname = "printk_ratelimit",
741 .data = &printk_ratelimit_state.interval,
742 .maxlen = sizeof(int),
743 .mode = 0644,
744 .proc_handler = proc_dointvec_jiffies,
745 },
746 {
747 .procname = "printk_ratelimit_burst",
748 .data = &printk_ratelimit_state.burst,
749 .maxlen = sizeof(int),
750 .mode = 0644,
751 .proc_handler = proc_dointvec,
752 },
753 {
754 .procname = "printk_delay",
755 .data = &printk_delay_msec,
756 .maxlen = sizeof(int),
757 .mode = 0644,
758 .proc_handler = proc_dointvec_minmax,
759 .extra1 = &zero,
760 .extra2 = &ten_thousand,
761 },
762 {
763 .procname = "dmesg_restrict",
764 .data = &dmesg_restrict,
765 .maxlen = sizeof(int),
766 .mode = 0644,
767 .proc_handler = proc_dointvec_minmax_sysadmin,
768 .extra1 = &zero,
769 .extra2 = &one,
770 },
771 {
772 .procname = "kptr_restrict",
773 .data = &kptr_restrict,
774 .maxlen = sizeof(int),
775 .mode = 0644,
776 .proc_handler = proc_dointvec_minmax_sysadmin,
777 .extra1 = &zero,
778 .extra2 = &two,
779 },
780 #endif
781 {
782 .procname = "ngroups_max",
783 .data = &ngroups_max,
784 .maxlen = sizeof (int),
785 .mode = 0444,
786 .proc_handler = proc_dointvec,
787 },
788 {
789 .procname = "cap_last_cap",
790 .data = (void *)&cap_last_cap,
791 .maxlen = sizeof(int),
792 .mode = 0444,
793 .proc_handler = proc_dointvec,
794 },
795 #if defined(CONFIG_LOCKUP_DETECTOR)
796 {
797 .procname = "watchdog",
798 .data = &watchdog_enabled,
799 .maxlen = sizeof (int),
800 .mode = 0644,
801 .proc_handler = proc_dowatchdog,
802 .extra1 = &zero,
803 .extra2 = &one,
804 },
805 {
806 .procname = "watchdog_thresh",
807 .data = &watchdog_thresh,
808 .maxlen = sizeof(int),
809 .mode = 0644,
810 .proc_handler = proc_dowatchdog,
811 .extra1 = &neg_one,
812 .extra2 = &sixty,
813 },
814 {
815 .procname = "softlockup_panic",
816 .data = &softlockup_panic,
817 .maxlen = sizeof(int),
818 .mode = 0644,
819 .proc_handler = proc_dointvec_minmax,
820 .extra1 = &zero,
821 .extra2 = &one,
822 },
823 {
824 .procname = "nmi_watchdog",
825 .data = &watchdog_enabled,
826 .maxlen = sizeof (int),
827 .mode = 0644,
828 .proc_handler = proc_dowatchdog,
829 .extra1 = &zero,
830 .extra2 = &one,
831 },
832 #endif
833 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
834 {
835 .procname = "unknown_nmi_panic",
836 .data = &unknown_nmi_panic,
837 .maxlen = sizeof (int),
838 .mode = 0644,
839 .proc_handler = proc_dointvec,
840 },
841 #endif
842 #if defined(CONFIG_X86)
843 {
844 .procname = "panic_on_unrecovered_nmi",
845 .data = &panic_on_unrecovered_nmi,
846 .maxlen = sizeof(int),
847 .mode = 0644,
848 .proc_handler = proc_dointvec,
849 },
850 {
851 .procname = "panic_on_io_nmi",
852 .data = &panic_on_io_nmi,
853 .maxlen = sizeof(int),
854 .mode = 0644,
855 .proc_handler = proc_dointvec,
856 },
857 #ifdef CONFIG_DEBUG_STACKOVERFLOW
858 {
859 .procname = "panic_on_stackoverflow",
860 .data = &sysctl_panic_on_stackoverflow,
861 .maxlen = sizeof(int),
862 .mode = 0644,
863 .proc_handler = proc_dointvec,
864 },
865 #endif
866 {
867 .procname = "bootloader_type",
868 .data = &bootloader_type,
869 .maxlen = sizeof (int),
870 .mode = 0444,
871 .proc_handler = proc_dointvec,
872 },
873 {
874 .procname = "bootloader_version",
875 .data = &bootloader_version,
876 .maxlen = sizeof (int),
877 .mode = 0444,
878 .proc_handler = proc_dointvec,
879 },
880 {
881 .procname = "kstack_depth_to_print",
882 .data = &kstack_depth_to_print,
883 .maxlen = sizeof(int),
884 .mode = 0644,
885 .proc_handler = proc_dointvec,
886 },
887 {
888 .procname = "io_delay_type",
889 .data = &io_delay_type,
890 .maxlen = sizeof(int),
891 .mode = 0644,
892 .proc_handler = proc_dointvec,
893 },
894 #endif
895 #if defined(CONFIG_MMU)
896 {
897 .procname = "randomize_va_space",
898 .data = &randomize_va_space,
899 .maxlen = sizeof(int),
900 .mode = 0644,
901 .proc_handler = proc_dointvec,
902 },
903 #endif
904 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
905 {
906 .procname = "spin_retry",
907 .data = &spin_retry,
908 .maxlen = sizeof (int),
909 .mode = 0644,
910 .proc_handler = proc_dointvec,
911 },
912 #endif
913 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
914 {
915 .procname = "acpi_video_flags",
916 .data = &acpi_realmode_flags,
917 .maxlen = sizeof (unsigned long),
918 .mode = 0644,
919 .proc_handler = proc_doulongvec_minmax,
920 },
921 #endif
922 #ifdef CONFIG_IA64
923 {
924 .procname = "ignore-unaligned-usertrap",
925 .data = &no_unaligned_warning,
926 .maxlen = sizeof (int),
927 .mode = 0644,
928 .proc_handler = proc_dointvec,
929 },
930 {
931 .procname = "unaligned-dump-stack",
932 .data = &unaligned_dump_stack,
933 .maxlen = sizeof (int),
934 .mode = 0644,
935 .proc_handler = proc_dointvec,
936 },
937 #endif
938 #ifdef CONFIG_DETECT_HUNG_TASK
939 {
940 .procname = "hung_task_panic",
941 .data = &sysctl_hung_task_panic,
942 .maxlen = sizeof(int),
943 .mode = 0644,
944 .proc_handler = proc_dointvec_minmax,
945 .extra1 = &zero,
946 .extra2 = &one,
947 },
948 {
949 .procname = "hung_task_check_count",
950 .data = &sysctl_hung_task_check_count,
951 .maxlen = sizeof(unsigned long),
952 .mode = 0644,
953 .proc_handler = proc_doulongvec_minmax,
954 },
955 {
956 .procname = "hung_task_timeout_secs",
957 .data = &sysctl_hung_task_timeout_secs,
958 .maxlen = sizeof(unsigned long),
959 .mode = 0644,
960 .proc_handler = proc_dohung_task_timeout_secs,
961 },
962 {
963 .procname = "hung_task_warnings",
964 .data = &sysctl_hung_task_warnings,
965 .maxlen = sizeof(unsigned long),
966 .mode = 0644,
967 .proc_handler = proc_doulongvec_minmax,
968 },
969 #endif
970 #ifdef CONFIG_COMPAT
971 {
972 .procname = "compat-log",
973 .data = &compat_log,
974 .maxlen = sizeof (int),
975 .mode = 0644,
976 .proc_handler = proc_dointvec,
977 },
978 #endif
979 #ifdef CONFIG_RT_MUTEXES
980 {
981 .procname = "max_lock_depth",
982 .data = &max_lock_depth,
983 .maxlen = sizeof(int),
984 .mode = 0644,
985 .proc_handler = proc_dointvec,
986 },
987 #endif
988 {
989 .procname = "poweroff_cmd",
990 .data = &poweroff_cmd,
991 .maxlen = POWEROFF_CMD_PATH_LEN,
992 .mode = 0644,
993 .proc_handler = proc_dostring,
994 },
995 #ifdef CONFIG_KEYS
996 {
997 .procname = "keys",
998 .mode = 0555,
999 .child = key_sysctls,
1000 },
1001 #endif
1002 #ifdef CONFIG_RCU_TORTURE_TEST
1003 {
1004 .procname = "rcutorture_runnable",
1005 .data = &rcutorture_runnable,
1006 .maxlen = sizeof(int),
1007 .mode = 0644,
1008 .proc_handler = proc_dointvec,
1009 },
1010 #endif
1011 #ifdef CONFIG_PERF_EVENTS
1012 /*
1013 * User-space scripts rely on the existence of this file
1014 * as a feature check for perf_events being enabled.
1015 *
1016 * So it's an ABI, do not remove!
1017 */
1018 {
1019 .procname = "perf_event_paranoid",
1020 .data = &sysctl_perf_event_paranoid,
1021 .maxlen = sizeof(sysctl_perf_event_paranoid),
1022 .mode = 0644,
1023 .proc_handler = proc_dointvec,
1024 },
1025 {
1026 .procname = "perf_event_mlock_kb",
1027 .data = &sysctl_perf_event_mlock,
1028 .maxlen = sizeof(sysctl_perf_event_mlock),
1029 .mode = 0644,
1030 .proc_handler = proc_dointvec,
1031 },
1032 {
1033 .procname = "perf_event_max_sample_rate",
1034 .data = &sysctl_perf_event_sample_rate,
1035 .maxlen = sizeof(sysctl_perf_event_sample_rate),
1036 .mode = 0644,
1037 .proc_handler = perf_proc_update_handler,
1038 },
1039 #endif
1040 #ifdef CONFIG_KMEMCHECK
1041 {
1042 .procname = "kmemcheck",
1043 .data = &kmemcheck_enabled,
1044 .maxlen = sizeof(int),
1045 .mode = 0644,
1046 .proc_handler = proc_dointvec,
1047 },
1048 #endif
1049 #ifdef CONFIG_BLOCK
1050 {
1051 .procname = "blk_iopoll",
1052 .data = &blk_iopoll_enabled,
1053 .maxlen = sizeof(int),
1054 .mode = 0644,
1055 .proc_handler = proc_dointvec,
1056 },
1057 #endif
1058 { }
1059 };
1060
1061 static struct ctl_table vm_table[] = {
1062 {
1063 .procname = "overcommit_memory",
1064 .data = &sysctl_overcommit_memory,
1065 .maxlen = sizeof(sysctl_overcommit_memory),
1066 .mode = 0644,
1067 .proc_handler = proc_dointvec_minmax,
1068 .extra1 = &zero,
1069 .extra2 = &two,
1070 },
1071 {
1072 .procname = "panic_on_oom",
1073 .data = &sysctl_panic_on_oom,
1074 .maxlen = sizeof(sysctl_panic_on_oom),
1075 .mode = 0644,
1076 .proc_handler = proc_dointvec_minmax,
1077 .extra1 = &zero,
1078 .extra2 = &two,
1079 },
1080 {
1081 .procname = "oom_kill_allocating_task",
1082 .data = &sysctl_oom_kill_allocating_task,
1083 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
1084 .mode = 0644,
1085 .proc_handler = proc_dointvec,
1086 },
1087 {
1088 .procname = "oom_dump_tasks",
1089 .data = &sysctl_oom_dump_tasks,
1090 .maxlen = sizeof(sysctl_oom_dump_tasks),
1091 .mode = 0644,
1092 .proc_handler = proc_dointvec,
1093 },
1094 {
1095 .procname = "overcommit_ratio",
1096 .data = &sysctl_overcommit_ratio,
1097 .maxlen = sizeof(sysctl_overcommit_ratio),
1098 .mode = 0644,
1099 .proc_handler = proc_dointvec,
1100 },
1101 {
1102 .procname = "page-cluster",
1103 .data = &page_cluster,
1104 .maxlen = sizeof(int),
1105 .mode = 0644,
1106 .proc_handler = proc_dointvec_minmax,
1107 .extra1 = &zero,
1108 },
1109 {
1110 .procname = "dirty_background_ratio",
1111 .data = &dirty_background_ratio,
1112 .maxlen = sizeof(dirty_background_ratio),
1113 .mode = 0644,
1114 .proc_handler = dirty_background_ratio_handler,
1115 .extra1 = &zero,
1116 .extra2 = &one_hundred,
1117 },
1118 {
1119 .procname = "dirty_background_bytes",
1120 .data = &dirty_background_bytes,
1121 .maxlen = sizeof(dirty_background_bytes),
1122 .mode = 0644,
1123 .proc_handler = dirty_background_bytes_handler,
1124 .extra1 = &one_ul,
1125 },
1126 {
1127 .procname = "dirty_ratio",
1128 .data = &vm_dirty_ratio,
1129 .maxlen = sizeof(vm_dirty_ratio),
1130 .mode = 0644,
1131 .proc_handler = dirty_ratio_handler,
1132 .extra1 = &zero,
1133 .extra2 = &one_hundred,
1134 },
1135 {
1136 .procname = "dirty_bytes",
1137 .data = &vm_dirty_bytes,
1138 .maxlen = sizeof(vm_dirty_bytes),
1139 .mode = 0644,
1140 .proc_handler = dirty_bytes_handler,
1141 .extra1 = &dirty_bytes_min,
1142 },
1143 {
1144 .procname = "dirty_writeback_centisecs",
1145 .data = &dirty_writeback_interval,
1146 .maxlen = sizeof(dirty_writeback_interval),
1147 .mode = 0644,
1148 .proc_handler = dirty_writeback_centisecs_handler,
1149 },
1150 {
1151 .procname = "dirty_expire_centisecs",
1152 .data = &dirty_expire_interval,
1153 .maxlen = sizeof(dirty_expire_interval),
1154 .mode = 0644,
1155 .proc_handler = proc_dointvec_minmax,
1156 .extra1 = &zero,
1157 },
1158 {
1159 .procname = "nr_pdflush_threads",
1160 .mode = 0444 /* read-only */,
1161 .proc_handler = pdflush_proc_obsolete,
1162 },
1163 {
1164 .procname = "swappiness",
1165 .data = &vm_swappiness,
1166 .maxlen = sizeof(vm_swappiness),
1167 .mode = 0644,
1168 .proc_handler = proc_dointvec_minmax,
1169 .extra1 = &zero,
1170 .extra2 = &one_hundred,
1171 },
1172 #ifdef CONFIG_HUGETLB_PAGE
1173 {
1174 .procname = "nr_hugepages",
1175 .data = NULL,
1176 .maxlen = sizeof(unsigned long),
1177 .mode = 0644,
1178 .proc_handler = hugetlb_sysctl_handler,
1179 .extra1 = (void *)&hugetlb_zero,
1180 .extra2 = (void *)&hugetlb_infinity,
1181 },
1182 #ifdef CONFIG_NUMA
1183 {
1184 .procname = "nr_hugepages_mempolicy",
1185 .data = NULL,
1186 .maxlen = sizeof(unsigned long),
1187 .mode = 0644,
1188 .proc_handler = &hugetlb_mempolicy_sysctl_handler,
1189 .extra1 = (void *)&hugetlb_zero,
1190 .extra2 = (void *)&hugetlb_infinity,
1191 },
1192 #endif
1193 {
1194 .procname = "hugetlb_shm_group",
1195 .data = &sysctl_hugetlb_shm_group,
1196 .maxlen = sizeof(gid_t),
1197 .mode = 0644,
1198 .proc_handler = proc_dointvec,
1199 },
1200 {
1201 .procname = "hugepages_treat_as_movable",
1202 .data = &hugepages_treat_as_movable,
1203 .maxlen = sizeof(int),
1204 .mode = 0644,
1205 .proc_handler = hugetlb_treat_movable_handler,
1206 },
1207 {
1208 .procname = "nr_overcommit_hugepages",
1209 .data = NULL,
1210 .maxlen = sizeof(unsigned long),
1211 .mode = 0644,
1212 .proc_handler = hugetlb_overcommit_handler,
1213 .extra1 = (void *)&hugetlb_zero,
1214 .extra2 = (void *)&hugetlb_infinity,
1215 },
1216 #endif
1217 {
1218 .procname = "lowmem_reserve_ratio",
1219 .data = &sysctl_lowmem_reserve_ratio,
1220 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1221 .mode = 0644,
1222 .proc_handler = lowmem_reserve_ratio_sysctl_handler,
1223 },
1224 {
1225 .procname = "drop_caches",
1226 .data = &sysctl_drop_caches,
1227 .maxlen = sizeof(int),
1228 .mode = 0644,
1229 .proc_handler = drop_caches_sysctl_handler,
1230 .extra1 = &one,
1231 .extra2 = &three,
1232 },
1233 #ifdef CONFIG_COMPACTION
1234 {
1235 .procname = "compact_memory",
1236 .data = &sysctl_compact_memory,
1237 .maxlen = sizeof(int),
1238 .mode = 0200,
1239 .proc_handler = sysctl_compaction_handler,
1240 },
1241 {
1242 .procname = "extfrag_threshold",
1243 .data = &sysctl_extfrag_threshold,
1244 .maxlen = sizeof(int),
1245 .mode = 0644,
1246 .proc_handler = sysctl_extfrag_handler,
1247 .extra1 = &min_extfrag_threshold,
1248 .extra2 = &max_extfrag_threshold,
1249 },
1250
1251 #endif /* CONFIG_COMPACTION */
1252 {
1253 .procname = "min_free_kbytes",
1254 .data = &min_free_kbytes,
1255 .maxlen = sizeof(min_free_kbytes),
1256 .mode = 0644,
1257 .proc_handler = min_free_kbytes_sysctl_handler,
1258 .extra1 = &zero,
1259 },
1260 {
1261 .procname = "percpu_pagelist_fraction",
1262 .data = &percpu_pagelist_fraction,
1263 .maxlen = sizeof(percpu_pagelist_fraction),
1264 .mode = 0644,
1265 .proc_handler = percpu_pagelist_fraction_sysctl_handler,
1266 .extra1 = &min_percpu_pagelist_fract,
1267 },
1268 #ifdef CONFIG_MMU
1269 {
1270 .procname = "max_map_count",
1271 .data = &sysctl_max_map_count,
1272 .maxlen = sizeof(sysctl_max_map_count),
1273 .mode = 0644,
1274 .proc_handler = proc_dointvec_minmax,
1275 .extra1 = &zero,
1276 },
1277 #else
1278 {
1279 .procname = "nr_trim_pages",
1280 .data = &sysctl_nr_trim_pages,
1281 .maxlen = sizeof(sysctl_nr_trim_pages),
1282 .mode = 0644,
1283 .proc_handler = proc_dointvec_minmax,
1284 .extra1 = &zero,
1285 },
1286 #endif
1287 {
1288 .procname = "laptop_mode",
1289 .data = &laptop_mode,
1290 .maxlen = sizeof(laptop_mode),
1291 .mode = 0644,
1292 .proc_handler = proc_dointvec_jiffies,
1293 },
1294 {
1295 .procname = "block_dump",
1296 .data = &block_dump,
1297 .maxlen = sizeof(block_dump),
1298 .mode = 0644,
1299 .proc_handler = proc_dointvec,
1300 .extra1 = &zero,
1301 },
1302 {
1303 .procname = "vfs_cache_pressure",
1304 .data = &sysctl_vfs_cache_pressure,
1305 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1306 .mode = 0644,
1307 .proc_handler = proc_dointvec,
1308 .extra1 = &zero,
1309 },
1310 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1311 {
1312 .procname = "legacy_va_layout",
1313 .data = &sysctl_legacy_va_layout,
1314 .maxlen = sizeof(sysctl_legacy_va_layout),
1315 .mode = 0644,
1316 .proc_handler = proc_dointvec,
1317 .extra1 = &zero,
1318 },
1319 #endif
1320 #ifdef CONFIG_NUMA
1321 {
1322 .procname = "zone_reclaim_mode",
1323 .data = &zone_reclaim_mode,
1324 .maxlen = sizeof(zone_reclaim_mode),
1325 .mode = 0644,
1326 .proc_handler = proc_dointvec,
1327 .extra1 = &zero,
1328 },
1329 {
1330 .procname = "min_unmapped_ratio",
1331 .data = &sysctl_min_unmapped_ratio,
1332 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1333 .mode = 0644,
1334 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler,
1335 .extra1 = &zero,
1336 .extra2 = &one_hundred,
1337 },
1338 {
1339 .procname = "min_slab_ratio",
1340 .data = &sysctl_min_slab_ratio,
1341 .maxlen = sizeof(sysctl_min_slab_ratio),
1342 .mode = 0644,
1343 .proc_handler = sysctl_min_slab_ratio_sysctl_handler,
1344 .extra1 = &zero,
1345 .extra2 = &one_hundred,
1346 },
1347 #endif
1348 #ifdef CONFIG_SMP
1349 {
1350 .procname = "stat_interval",
1351 .data = &sysctl_stat_interval,
1352 .maxlen = sizeof(sysctl_stat_interval),
1353 .mode = 0644,
1354 .proc_handler = proc_dointvec_jiffies,
1355 },
1356 #endif
1357 #ifdef CONFIG_MMU
1358 {
1359 .procname = "mmap_min_addr",
1360 .data = &dac_mmap_min_addr,
1361 .maxlen = sizeof(unsigned long),
1362 .mode = 0644,
1363 .proc_handler = mmap_min_addr_handler,
1364 },
1365 #endif
1366 #ifdef CONFIG_NUMA
1367 {
1368 .procname = "numa_zonelist_order",
1369 .data = &numa_zonelist_order,
1370 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1371 .mode = 0644,
1372 .proc_handler = numa_zonelist_order_handler,
1373 },
1374 #endif
1375 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1376 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1377 {
1378 .procname = "vdso_enabled",
1379 .data = &vdso_enabled,
1380 .maxlen = sizeof(vdso_enabled),
1381 .mode = 0644,
1382 .proc_handler = proc_dointvec,
1383 .extra1 = &zero,
1384 },
1385 #endif
1386 #ifdef CONFIG_HIGHMEM
1387 {
1388 .procname = "highmem_is_dirtyable",
1389 .data = &vm_highmem_is_dirtyable,
1390 .maxlen = sizeof(vm_highmem_is_dirtyable),
1391 .mode = 0644,
1392 .proc_handler = proc_dointvec_minmax,
1393 .extra1 = &zero,
1394 .extra2 = &one,
1395 },
1396 #endif
1397 {
1398 .procname = "scan_unevictable_pages",
1399 .data = &scan_unevictable_pages,
1400 .maxlen = sizeof(scan_unevictable_pages),
1401 .mode = 0644,
1402 .proc_handler = scan_unevictable_handler,
1403 },
1404 #ifdef CONFIG_MEMORY_FAILURE
1405 {
1406 .procname = "memory_failure_early_kill",
1407 .data = &sysctl_memory_failure_early_kill,
1408 .maxlen = sizeof(sysctl_memory_failure_early_kill),
1409 .mode = 0644,
1410 .proc_handler = proc_dointvec_minmax,
1411 .extra1 = &zero,
1412 .extra2 = &one,
1413 },
1414 {
1415 .procname = "memory_failure_recovery",
1416 .data = &sysctl_memory_failure_recovery,
1417 .maxlen = sizeof(sysctl_memory_failure_recovery),
1418 .mode = 0644,
1419 .proc_handler = proc_dointvec_minmax,
1420 .extra1 = &zero,
1421 .extra2 = &one,
1422 },
1423 #endif
1424 { }
1425 };
1426
1427 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1428 static struct ctl_table binfmt_misc_table[] = {
1429 { }
1430 };
1431 #endif
1432
1433 static struct ctl_table fs_table[] = {
1434 {
1435 .procname = "inode-nr",
1436 .data = &inodes_stat,
1437 .maxlen = 2*sizeof(int),
1438 .mode = 0444,
1439 .proc_handler = proc_nr_inodes,
1440 },
1441 {
1442 .procname = "inode-state",
1443 .data = &inodes_stat,
1444 .maxlen = 7*sizeof(int),
1445 .mode = 0444,
1446 .proc_handler = proc_nr_inodes,
1447 },
1448 {
1449 .procname = "file-nr",
1450 .data = &files_stat,
1451 .maxlen = sizeof(files_stat),
1452 .mode = 0444,
1453 .proc_handler = proc_nr_files,
1454 },
1455 {
1456 .procname = "file-max",
1457 .data = &files_stat.max_files,
1458 .maxlen = sizeof(files_stat.max_files),
1459 .mode = 0644,
1460 .proc_handler = proc_doulongvec_minmax,
1461 },
1462 {
1463 .procname = "nr_open",
1464 .data = &sysctl_nr_open,
1465 .maxlen = sizeof(int),
1466 .mode = 0644,
1467 .proc_handler = proc_dointvec_minmax,
1468 .extra1 = &sysctl_nr_open_min,
1469 .extra2 = &sysctl_nr_open_max,
1470 },
1471 {
1472 .procname = "dentry-state",
1473 .data = &dentry_stat,
1474 .maxlen = 6*sizeof(int),
1475 .mode = 0444,
1476 .proc_handler = proc_nr_dentry,
1477 },
1478 {
1479 .procname = "overflowuid",
1480 .data = &fs_overflowuid,
1481 .maxlen = sizeof(int),
1482 .mode = 0644,
1483 .proc_handler = proc_dointvec_minmax,
1484 .extra1 = &minolduid,
1485 .extra2 = &maxolduid,
1486 },
1487 {
1488 .procname = "overflowgid",
1489 .data = &fs_overflowgid,
1490 .maxlen = sizeof(int),
1491 .mode = 0644,
1492 .proc_handler = proc_dointvec_minmax,
1493 .extra1 = &minolduid,
1494 .extra2 = &maxolduid,
1495 },
1496 #ifdef CONFIG_FILE_LOCKING
1497 {
1498 .procname = "leases-enable",
1499 .data = &leases_enable,
1500 .maxlen = sizeof(int),
1501 .mode = 0644,
1502 .proc_handler = proc_dointvec,
1503 },
1504 #endif
1505 #ifdef CONFIG_DNOTIFY
1506 {
1507 .procname = "dir-notify-enable",
1508 .data = &dir_notify_enable,
1509 .maxlen = sizeof(int),
1510 .mode = 0644,
1511 .proc_handler = proc_dointvec,
1512 },
1513 #endif
1514 #ifdef CONFIG_MMU
1515 #ifdef CONFIG_FILE_LOCKING
1516 {
1517 .procname = "lease-break-time",
1518 .data = &lease_break_time,
1519 .maxlen = sizeof(int),
1520 .mode = 0644,
1521 .proc_handler = proc_dointvec,
1522 },
1523 #endif
1524 #ifdef CONFIG_AIO
1525 {
1526 .procname = "aio-nr",
1527 .data = &aio_nr,
1528 .maxlen = sizeof(aio_nr),
1529 .mode = 0444,
1530 .proc_handler = proc_doulongvec_minmax,
1531 },
1532 {
1533 .procname = "aio-max-nr",
1534 .data = &aio_max_nr,
1535 .maxlen = sizeof(aio_max_nr),
1536 .mode = 0644,
1537 .proc_handler = proc_doulongvec_minmax,
1538 },
1539 #endif /* CONFIG_AIO */
1540 #ifdef CONFIG_INOTIFY_USER
1541 {
1542 .procname = "inotify",
1543 .mode = 0555,
1544 .child = inotify_table,
1545 },
1546 #endif
1547 #ifdef CONFIG_EPOLL
1548 {
1549 .procname = "epoll",
1550 .mode = 0555,
1551 .child = epoll_table,
1552 },
1553 #endif
1554 #endif
1555 {
1556 .procname = "protected_symlinks",
1557 .data = &sysctl_protected_symlinks,
1558 .maxlen = sizeof(int),
1559 .mode = 0600,
1560 .proc_handler = proc_dointvec_minmax,
1561 .extra1 = &zero,
1562 .extra2 = &one,
1563 },
1564 {
1565 .procname = "protected_hardlinks",
1566 .data = &sysctl_protected_hardlinks,
1567 .maxlen = sizeof(int),
1568 .mode = 0600,
1569 .proc_handler = proc_dointvec_minmax,
1570 .extra1 = &zero,
1571 .extra2 = &one,
1572 },
1573 {
1574 .procname = "suid_dumpable",
1575 .data = &suid_dumpable,
1576 .maxlen = sizeof(int),
1577 .mode = 0644,
1578 .proc_handler = proc_dointvec_minmax_coredump,
1579 .extra1 = &zero,
1580 .extra2 = &two,
1581 },
1582 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1583 {
1584 .procname = "binfmt_misc",
1585 .mode = 0555,
1586 .child = binfmt_misc_table,
1587 },
1588 #endif
1589 {
1590 .procname = "pipe-max-size",
1591 .data = &pipe_max_size,
1592 .maxlen = sizeof(int),
1593 .mode = 0644,
1594 .proc_handler = &pipe_proc_fn,
1595 .extra1 = &pipe_min_size,
1596 },
1597 { }
1598 };
1599
1600 static struct ctl_table debug_table[] = {
1601 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
1602 {
1603 .procname = "exception-trace",
1604 .data = &show_unhandled_signals,
1605 .maxlen = sizeof(int),
1606 .mode = 0644,
1607 .proc_handler = proc_dointvec
1608 },
1609 #endif
1610 #if defined(CONFIG_OPTPROBES)
1611 {
1612 .procname = "kprobes-optimization",
1613 .data = &sysctl_kprobes_optimization,
1614 .maxlen = sizeof(int),
1615 .mode = 0644,
1616 .proc_handler = proc_kprobes_optimization_handler,
1617 .extra1 = &zero,
1618 .extra2 = &one,
1619 },
1620 #endif
1621 { }
1622 };
1623
1624 static struct ctl_table dev_table[] = {
1625 { }
1626 };
1627
1628 int __init sysctl_init(void)
1629 {
1630 struct ctl_table_header *hdr;
1631
1632 hdr = register_sysctl_table(sysctl_base_table);
1633 kmemleak_not_leak(hdr);
1634 return 0;
1635 }
1636
1637 #endif /* CONFIG_SYSCTL */
1638
1639 /*
1640 * /proc/sys support
1641 */
1642
1643 #ifdef CONFIG_PROC_SYSCTL
1644
1645 static int _proc_do_string(void* data, int maxlen, int write,
1646 void __user *buffer,
1647 size_t *lenp, loff_t *ppos)
1648 {
1649 size_t len;
1650 char __user *p;
1651 char c;
1652
1653 if (!data || !maxlen || !*lenp) {
1654 *lenp = 0;
1655 return 0;
1656 }
1657
1658 if (write) {
1659 len = 0;
1660 p = buffer;
1661 while (len < *lenp) {
1662 if (get_user(c, p++))
1663 return -EFAULT;
1664 if (c == 0 || c == '\n')
1665 break;
1666 len++;
1667 }
1668 if (len >= maxlen)
1669 len = maxlen-1;
1670 if(copy_from_user(data, buffer, len))
1671 return -EFAULT;
1672 ((char *) data)[len] = 0;
1673 *ppos += *lenp;
1674 } else {
1675 len = strlen(data);
1676 if (len > maxlen)
1677 len = maxlen;
1678
1679 if (*ppos > len) {
1680 *lenp = 0;
1681 return 0;
1682 }
1683
1684 data += *ppos;
1685 len -= *ppos;
1686
1687 if (len > *lenp)
1688 len = *lenp;
1689 if (len)
1690 if(copy_to_user(buffer, data, len))
1691 return -EFAULT;
1692 if (len < *lenp) {
1693 if(put_user('\n', ((char __user *) buffer) + len))
1694 return -EFAULT;
1695 len++;
1696 }
1697 *lenp = len;
1698 *ppos += len;
1699 }
1700 return 0;
1701 }
1702
1703 /**
1704 * proc_dostring - read a string sysctl
1705 * @table: the sysctl table
1706 * @write: %TRUE if this is a write to the sysctl file
1707 * @buffer: the user buffer
1708 * @lenp: the size of the user buffer
1709 * @ppos: file position
1710 *
1711 * Reads/writes a string from/to the user buffer. If the kernel
1712 * buffer provided is not large enough to hold the string, the
1713 * string is truncated. The copied string is %NULL-terminated.
1714 * If the string is being read by the user process, it is copied
1715 * and a newline '\n' is added. It is truncated if the buffer is
1716 * not large enough.
1717 *
1718 * Returns 0 on success.
1719 */
1720 int proc_dostring(struct ctl_table *table, int write,
1721 void __user *buffer, size_t *lenp, loff_t *ppos)
1722 {
1723 return _proc_do_string(table->data, table->maxlen, write,
1724 buffer, lenp, ppos);
1725 }
1726
1727 static size_t proc_skip_spaces(char **buf)
1728 {
1729 size_t ret;
1730 char *tmp = skip_spaces(*buf);
1731 ret = tmp - *buf;
1732 *buf = tmp;
1733 return ret;
1734 }
1735
1736 static void proc_skip_char(char **buf, size_t *size, const char v)
1737 {
1738 while (*size) {
1739 if (**buf != v)
1740 break;
1741 (*size)--;
1742 (*buf)++;
1743 }
1744 }
1745
1746 #define TMPBUFLEN 22
1747 /**
1748 * proc_get_long - reads an ASCII formatted integer from a user buffer
1749 *
1750 * @buf: a kernel buffer
1751 * @size: size of the kernel buffer
1752 * @val: this is where the number will be stored
1753 * @neg: set to %TRUE if number is negative
1754 * @perm_tr: a vector which contains the allowed trailers
1755 * @perm_tr_len: size of the perm_tr vector
1756 * @tr: pointer to store the trailer character
1757 *
1758 * In case of success %0 is returned and @buf and @size are updated with
1759 * the amount of bytes read. If @tr is non-NULL and a trailing
1760 * character exists (size is non-zero after returning from this
1761 * function), @tr is updated with the trailing character.
1762 */
1763 static int proc_get_long(char **buf, size_t *size,
1764 unsigned long *val, bool *neg,
1765 const char *perm_tr, unsigned perm_tr_len, char *tr)
1766 {
1767 int len;
1768 char *p, tmp[TMPBUFLEN];
1769
1770 if (!*size)
1771 return -EINVAL;
1772
1773 len = *size;
1774 if (len > TMPBUFLEN - 1)
1775 len = TMPBUFLEN - 1;
1776
1777 memcpy(tmp, *buf, len);
1778
1779 tmp[len] = 0;
1780 p = tmp;
1781 if (*p == '-' && *size > 1) {
1782 *neg = true;
1783 p++;
1784 } else
1785 *neg = false;
1786 if (!isdigit(*p))
1787 return -EINVAL;
1788
1789 *val = simple_strtoul(p, &p, 0);
1790
1791 len = p - tmp;
1792
1793 /* We don't know if the next char is whitespace thus we may accept
1794 * invalid integers (e.g. 1234...a) or two integers instead of one
1795 * (e.g. 123...1). So lets not allow such large numbers. */
1796 if (len == TMPBUFLEN - 1)
1797 return -EINVAL;
1798
1799 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
1800 return -EINVAL;
1801
1802 if (tr && (len < *size))
1803 *tr = *p;
1804
1805 *buf += len;
1806 *size -= len;
1807
1808 return 0;
1809 }
1810
1811 /**
1812 * proc_put_long - converts an integer to a decimal ASCII formatted string
1813 *
1814 * @buf: the user buffer
1815 * @size: the size of the user buffer
1816 * @val: the integer to be converted
1817 * @neg: sign of the number, %TRUE for negative
1818 *
1819 * In case of success %0 is returned and @buf and @size are updated with
1820 * the amount of bytes written.
1821 */
1822 static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
1823 bool neg)
1824 {
1825 int len;
1826 char tmp[TMPBUFLEN], *p = tmp;
1827
1828 sprintf(p, "%s%lu", neg ? "-" : "", val);
1829 len = strlen(tmp);
1830 if (len > *size)
1831 len = *size;
1832 if (copy_to_user(*buf, tmp, len))
1833 return -EFAULT;
1834 *size -= len;
1835 *buf += len;
1836 return 0;
1837 }
1838 #undef TMPBUFLEN
1839
1840 static int proc_put_char(void __user **buf, size_t *size, char c)
1841 {
1842 if (*size) {
1843 char __user **buffer = (char __user **)buf;
1844 if (put_user(c, *buffer))
1845 return -EFAULT;
1846 (*size)--, (*buffer)++;
1847 *buf = *buffer;
1848 }
1849 return 0;
1850 }
1851
1852 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
1853 int *valp,
1854 int write, void *data)
1855 {
1856 if (write) {
1857 *valp = *negp ? -*lvalp : *lvalp;
1858 } else {
1859 int val = *valp;
1860 if (val < 0) {
1861 *negp = true;
1862 *lvalp = (unsigned long)-val;
1863 } else {
1864 *negp = false;
1865 *lvalp = (unsigned long)val;
1866 }
1867 }
1868 return 0;
1869 }
1870
1871 static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
1872
1873 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
1874 int write, void __user *buffer,
1875 size_t *lenp, loff_t *ppos,
1876 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
1877 int write, void *data),
1878 void *data)
1879 {
1880 int *i, vleft, first = 1, err = 0;
1881 unsigned long page = 0;
1882 size_t left;
1883 char *kbuf;
1884
1885 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
1886 *lenp = 0;
1887 return 0;
1888 }
1889
1890 i = (int *) tbl_data;
1891 vleft = table->maxlen / sizeof(*i);
1892 left = *lenp;
1893
1894 if (!conv)
1895 conv = do_proc_dointvec_conv;
1896
1897 if (write) {
1898 if (left > PAGE_SIZE - 1)
1899 left = PAGE_SIZE - 1;
1900 page = __get_free_page(GFP_TEMPORARY);
1901 kbuf = (char *) page;
1902 if (!kbuf)
1903 return -ENOMEM;
1904 if (copy_from_user(kbuf, buffer, left)) {
1905 err = -EFAULT;
1906 goto free;
1907 }
1908 kbuf[left] = 0;
1909 }
1910
1911 for (; left && vleft--; i++, first=0) {
1912 unsigned long lval;
1913 bool neg;
1914
1915 if (write) {
1916 left -= proc_skip_spaces(&kbuf);
1917
1918 if (!left)
1919 break;
1920 err = proc_get_long(&kbuf, &left, &lval, &neg,
1921 proc_wspace_sep,
1922 sizeof(proc_wspace_sep), NULL);
1923 if (err)
1924 break;
1925 if (conv(&neg, &lval, i, 1, data)) {
1926 err = -EINVAL;
1927 break;
1928 }
1929 } else {
1930 if (conv(&neg, &lval, i, 0, data)) {
1931 err = -EINVAL;
1932 break;
1933 }
1934 if (!first)
1935 err = proc_put_char(&buffer, &left, '\t');
1936 if (err)
1937 break;
1938 err = proc_put_long(&buffer, &left, lval, neg);
1939 if (err)
1940 break;
1941 }
1942 }
1943
1944 if (!write && !first && left && !err)
1945 err = proc_put_char(&buffer, &left, '\n');
1946 if (write && !err && left)
1947 left -= proc_skip_spaces(&kbuf);
1948 free:
1949 if (write) {
1950 free_page(page);
1951 if (first)
1952 return err ? : -EINVAL;
1953 }
1954 *lenp -= left;
1955 *ppos += *lenp;
1956 return err;
1957 }
1958
1959 static int do_proc_dointvec(struct ctl_table *table, int write,
1960 void __user *buffer, size_t *lenp, loff_t *ppos,
1961 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
1962 int write, void *data),
1963 void *data)
1964 {
1965 return __do_proc_dointvec(table->data, table, write,
1966 buffer, lenp, ppos, conv, data);
1967 }
1968
1969 /**
1970 * proc_dointvec - read a vector of integers
1971 * @table: the sysctl table
1972 * @write: %TRUE if this is a write to the sysctl file
1973 * @buffer: the user buffer
1974 * @lenp: the size of the user buffer
1975 * @ppos: file position
1976 *
1977 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1978 * values from/to the user buffer, treated as an ASCII string.
1979 *
1980 * Returns 0 on success.
1981 */
1982 int proc_dointvec(struct ctl_table *table, int write,
1983 void __user *buffer, size_t *lenp, loff_t *ppos)
1984 {
1985 return do_proc_dointvec(table,write,buffer,lenp,ppos,
1986 NULL,NULL);
1987 }
1988
1989 /*
1990 * Taint values can only be increased
1991 * This means we can safely use a temporary.
1992 */
1993 static int proc_taint(struct ctl_table *table, int write,
1994 void __user *buffer, size_t *lenp, loff_t *ppos)
1995 {
1996 struct ctl_table t;
1997 unsigned long tmptaint = get_taint();
1998 int err;
1999
2000 if (write && !capable(CAP_SYS_ADMIN))
2001 return -EPERM;
2002
2003 t = *table;
2004 t.data = &tmptaint;
2005 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
2006 if (err < 0)
2007 return err;
2008
2009 if (write) {
2010 /*
2011 * Poor man's atomic or. Not worth adding a primitive
2012 * to everyone's atomic.h for this
2013 */
2014 int i;
2015 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2016 if ((tmptaint >> i) & 1)
2017 add_taint(i);
2018 }
2019 }
2020
2021 return err;
2022 }
2023
2024 #ifdef CONFIG_PRINTK
2025 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
2026 void __user *buffer, size_t *lenp, loff_t *ppos)
2027 {
2028 if (write && !capable(CAP_SYS_ADMIN))
2029 return -EPERM;
2030
2031 return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2032 }
2033 #endif
2034
2035 struct do_proc_dointvec_minmax_conv_param {
2036 int *min;
2037 int *max;
2038 };
2039
2040 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
2041 int *valp,
2042 int write, void *data)
2043 {
2044 struct do_proc_dointvec_minmax_conv_param *param = data;
2045 if (write) {
2046 int val = *negp ? -*lvalp : *lvalp;
2047 if ((param->min && *param->min > val) ||
2048 (param->max && *param->max < val))
2049 return -EINVAL;
2050 *valp = val;
2051 } else {
2052 int val = *valp;
2053 if (val < 0) {
2054 *negp = true;
2055 *lvalp = (unsigned long)-val;
2056 } else {
2057 *negp = false;
2058 *lvalp = (unsigned long)val;
2059 }
2060 }
2061 return 0;
2062 }
2063
2064 /**
2065 * proc_dointvec_minmax - read a vector of integers with min/max values
2066 * @table: the sysctl table
2067 * @write: %TRUE if this is a write to the sysctl file
2068 * @buffer: the user buffer
2069 * @lenp: the size of the user buffer
2070 * @ppos: file position
2071 *
2072 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2073 * values from/to the user buffer, treated as an ASCII string.
2074 *
2075 * This routine will ensure the values are within the range specified by
2076 * table->extra1 (min) and table->extra2 (max).
2077 *
2078 * Returns 0 on success.
2079 */
2080 int proc_dointvec_minmax(struct ctl_table *table, int write,
2081 void __user *buffer, size_t *lenp, loff_t *ppos)
2082 {
2083 struct do_proc_dointvec_minmax_conv_param param = {
2084 .min = (int *) table->extra1,
2085 .max = (int *) table->extra2,
2086 };
2087 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2088 do_proc_dointvec_minmax_conv, &param);
2089 }
2090
2091 static void validate_coredump_safety(void)
2092 {
2093 #ifdef CONFIG_COREDUMP
2094 if (suid_dumpable == SUID_DUMPABLE_SAFE &&
2095 core_pattern[0] != '/' && core_pattern[0] != '|') {
2096 printk(KERN_WARNING "Unsafe core_pattern used with "\
2097 "suid_dumpable=2. Pipe handler or fully qualified "\
2098 "core dump path required.\n");
2099 }
2100 #endif
2101 }
2102
2103 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
2104 void __user *buffer, size_t *lenp, loff_t *ppos)
2105 {
2106 int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2107 if (!error)
2108 validate_coredump_safety();
2109 return error;
2110 }
2111
2112 #ifdef CONFIG_COREDUMP
2113 static int proc_dostring_coredump(struct ctl_table *table, int write,
2114 void __user *buffer, size_t *lenp, loff_t *ppos)
2115 {
2116 int error = proc_dostring(table, write, buffer, lenp, ppos);
2117 if (!error)
2118 validate_coredump_safety();
2119 return error;
2120 }
2121 #endif
2122
2123 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2124 void __user *buffer,
2125 size_t *lenp, loff_t *ppos,
2126 unsigned long convmul,
2127 unsigned long convdiv)
2128 {
2129 unsigned long *i, *min, *max;
2130 int vleft, first = 1, err = 0;
2131 unsigned long page = 0;
2132 size_t left;
2133 char *kbuf;
2134
2135 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
2136 *lenp = 0;
2137 return 0;
2138 }
2139
2140 i = (unsigned long *) data;
2141 min = (unsigned long *) table->extra1;
2142 max = (unsigned long *) table->extra2;
2143 vleft = table->maxlen / sizeof(unsigned long);
2144 left = *lenp;
2145
2146 if (write) {
2147 if (left > PAGE_SIZE - 1)
2148 left = PAGE_SIZE - 1;
2149 page = __get_free_page(GFP_TEMPORARY);
2150 kbuf = (char *) page;
2151 if (!kbuf)
2152 return -ENOMEM;
2153 if (copy_from_user(kbuf, buffer, left)) {
2154 err = -EFAULT;
2155 goto free;
2156 }
2157 kbuf[left] = 0;
2158 }
2159
2160 for (; left && vleft--; i++, first = 0) {
2161 unsigned long val;
2162
2163 if (write) {
2164 bool neg;
2165
2166 left -= proc_skip_spaces(&kbuf);
2167
2168 err = proc_get_long(&kbuf, &left, &val, &neg,
2169 proc_wspace_sep,
2170 sizeof(proc_wspace_sep), NULL);
2171 if (err)
2172 break;
2173 if (neg)
2174 continue;
2175 if ((min && val < *min) || (max && val > *max))
2176 continue;
2177 *i = val;
2178 } else {
2179 val = convdiv * (*i) / convmul;
2180 if (!first)
2181 err = proc_put_char(&buffer, &left, '\t');
2182 err = proc_put_long(&buffer, &left, val, false);
2183 if (err)
2184 break;
2185 }
2186 }
2187
2188 if (!write && !first && left && !err)
2189 err = proc_put_char(&buffer, &left, '\n');
2190 if (write && !err)
2191 left -= proc_skip_spaces(&kbuf);
2192 free:
2193 if (write) {
2194 free_page(page);
2195 if (first)
2196 return err ? : -EINVAL;
2197 }
2198 *lenp -= left;
2199 *ppos += *lenp;
2200 return err;
2201 }
2202
2203 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2204 void __user *buffer,
2205 size_t *lenp, loff_t *ppos,
2206 unsigned long convmul,
2207 unsigned long convdiv)
2208 {
2209 return __do_proc_doulongvec_minmax(table->data, table, write,
2210 buffer, lenp, ppos, convmul, convdiv);
2211 }
2212
2213 /**
2214 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2215 * @table: the sysctl table
2216 * @write: %TRUE if this is a write to the sysctl file
2217 * @buffer: the user buffer
2218 * @lenp: the size of the user buffer
2219 * @ppos: file position
2220 *
2221 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2222 * values from/to the user buffer, treated as an ASCII string.
2223 *
2224 * This routine will ensure the values are within the range specified by
2225 * table->extra1 (min) and table->extra2 (max).
2226 *
2227 * Returns 0 on success.
2228 */
2229 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2230 void __user *buffer, size_t *lenp, loff_t *ppos)
2231 {
2232 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
2233 }
2234
2235 /**
2236 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2237 * @table: the sysctl table
2238 * @write: %TRUE if this is a write to the sysctl file
2239 * @buffer: the user buffer
2240 * @lenp: the size of the user buffer
2241 * @ppos: file position
2242 *
2243 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2244 * values from/to the user buffer, treated as an ASCII string. The values
2245 * are treated as milliseconds, and converted to jiffies when they are stored.
2246 *
2247 * This routine will ensure the values are within the range specified by
2248 * table->extra1 (min) and table->extra2 (max).
2249 *
2250 * Returns 0 on success.
2251 */
2252 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2253 void __user *buffer,
2254 size_t *lenp, loff_t *ppos)
2255 {
2256 return do_proc_doulongvec_minmax(table, write, buffer,
2257 lenp, ppos, HZ, 1000l);
2258 }
2259
2260
2261 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
2262 int *valp,
2263 int write, void *data)
2264 {
2265 if (write) {
2266 if (*lvalp > LONG_MAX / HZ)
2267 return 1;
2268 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2269 } else {
2270 int val = *valp;
2271 unsigned long lval;
2272 if (val < 0) {
2273 *negp = true;
2274 lval = (unsigned long)-val;
2275 } else {
2276 *negp = false;
2277 lval = (unsigned long)val;
2278 }
2279 *lvalp = lval / HZ;
2280 }
2281 return 0;
2282 }
2283
2284 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
2285 int *valp,
2286 int write, void *data)
2287 {
2288 if (write) {
2289 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2290 return 1;
2291 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2292 } else {
2293 int val = *valp;
2294 unsigned long lval;
2295 if (val < 0) {
2296 *negp = true;
2297 lval = (unsigned long)-val;
2298 } else {
2299 *negp = false;
2300 lval = (unsigned long)val;
2301 }
2302 *lvalp = jiffies_to_clock_t(lval);
2303 }
2304 return 0;
2305 }
2306
2307 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
2308 int *valp,
2309 int write, void *data)
2310 {
2311 if (write) {
2312 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2313 } else {
2314 int val = *valp;
2315 unsigned long lval;
2316 if (val < 0) {
2317 *negp = true;
2318 lval = (unsigned long)-val;
2319 } else {
2320 *negp = false;
2321 lval = (unsigned long)val;
2322 }
2323 *lvalp = jiffies_to_msecs(lval);
2324 }
2325 return 0;
2326 }
2327
2328 /**
2329 * proc_dointvec_jiffies - read a vector of integers as seconds
2330 * @table: the sysctl table
2331 * @write: %TRUE if this is a write to the sysctl file
2332 * @buffer: the user buffer
2333 * @lenp: the size of the user buffer
2334 * @ppos: file position
2335 *
2336 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2337 * values from/to the user buffer, treated as an ASCII string.
2338 * The values read are assumed to be in seconds, and are converted into
2339 * jiffies.
2340 *
2341 * Returns 0 on success.
2342 */
2343 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2344 void __user *buffer, size_t *lenp, loff_t *ppos)
2345 {
2346 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2347 do_proc_dointvec_jiffies_conv,NULL);
2348 }
2349
2350 /**
2351 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2352 * @table: the sysctl table
2353 * @write: %TRUE if this is a write to the sysctl file
2354 * @buffer: the user buffer
2355 * @lenp: the size of the user buffer
2356 * @ppos: pointer to the file position
2357 *
2358 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2359 * values from/to the user buffer, treated as an ASCII string.
2360 * The values read are assumed to be in 1/USER_HZ seconds, and
2361 * are converted into jiffies.
2362 *
2363 * Returns 0 on success.
2364 */
2365 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2366 void __user *buffer, size_t *lenp, loff_t *ppos)
2367 {
2368 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2369 do_proc_dointvec_userhz_jiffies_conv,NULL);
2370 }
2371
2372 /**
2373 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2374 * @table: the sysctl table
2375 * @write: %TRUE if this is a write to the sysctl file
2376 * @buffer: the user buffer
2377 * @lenp: the size of the user buffer
2378 * @ppos: file position
2379 * @ppos: the current position in the file
2380 *
2381 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2382 * values from/to the user buffer, treated as an ASCII string.
2383 * The values read are assumed to be in 1/1000 seconds, and
2384 * are converted into jiffies.
2385 *
2386 * Returns 0 on success.
2387 */
2388 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2389 void __user *buffer, size_t *lenp, loff_t *ppos)
2390 {
2391 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2392 do_proc_dointvec_ms_jiffies_conv, NULL);
2393 }
2394
2395 static int proc_do_cad_pid(struct ctl_table *table, int write,
2396 void __user *buffer, size_t *lenp, loff_t *ppos)
2397 {
2398 struct pid *new_pid;
2399 pid_t tmp;
2400 int r;
2401
2402 tmp = pid_vnr(cad_pid);
2403
2404 r = __do_proc_dointvec(&tmp, table, write, buffer,
2405 lenp, ppos, NULL, NULL);
2406 if (r || !write)
2407 return r;
2408
2409 new_pid = find_get_pid(tmp);
2410 if (!new_pid)
2411 return -ESRCH;
2412
2413 put_pid(xchg(&cad_pid, new_pid));
2414 return 0;
2415 }
2416
2417 /**
2418 * proc_do_large_bitmap - read/write from/to a large bitmap
2419 * @table: the sysctl table
2420 * @write: %TRUE if this is a write to the sysctl file
2421 * @buffer: the user buffer
2422 * @lenp: the size of the user buffer
2423 * @ppos: file position
2424 *
2425 * The bitmap is stored at table->data and the bitmap length (in bits)
2426 * in table->maxlen.
2427 *
2428 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2429 * large bitmaps may be represented in a compact manner. Writing into
2430 * the file will clear the bitmap then update it with the given input.
2431 *
2432 * Returns 0 on success.
2433 */
2434 int proc_do_large_bitmap(struct ctl_table *table, int write,
2435 void __user *buffer, size_t *lenp, loff_t *ppos)
2436 {
2437 int err = 0;
2438 bool first = 1;
2439 size_t left = *lenp;
2440 unsigned long bitmap_len = table->maxlen;
2441 unsigned long *bitmap = (unsigned long *) table->data;
2442 unsigned long *tmp_bitmap = NULL;
2443 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
2444
2445 if (!bitmap_len || !left || (*ppos && !write)) {
2446 *lenp = 0;
2447 return 0;
2448 }
2449
2450 if (write) {
2451 unsigned long page = 0;
2452 char *kbuf;
2453
2454 if (left > PAGE_SIZE - 1)
2455 left = PAGE_SIZE - 1;
2456
2457 page = __get_free_page(GFP_TEMPORARY);
2458 kbuf = (char *) page;
2459 if (!kbuf)
2460 return -ENOMEM;
2461 if (copy_from_user(kbuf, buffer, left)) {
2462 free_page(page);
2463 return -EFAULT;
2464 }
2465 kbuf[left] = 0;
2466
2467 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long),
2468 GFP_KERNEL);
2469 if (!tmp_bitmap) {
2470 free_page(page);
2471 return -ENOMEM;
2472 }
2473 proc_skip_char(&kbuf, &left, '\n');
2474 while (!err && left) {
2475 unsigned long val_a, val_b;
2476 bool neg;
2477
2478 err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a,
2479 sizeof(tr_a), &c);
2480 if (err)
2481 break;
2482 if (val_a >= bitmap_len || neg) {
2483 err = -EINVAL;
2484 break;
2485 }
2486
2487 val_b = val_a;
2488 if (left) {
2489 kbuf++;
2490 left--;
2491 }
2492
2493 if (c == '-') {
2494 err = proc_get_long(&kbuf, &left, &val_b,
2495 &neg, tr_b, sizeof(tr_b),
2496 &c);
2497 if (err)
2498 break;
2499 if (val_b >= bitmap_len || neg ||
2500 val_a > val_b) {
2501 err = -EINVAL;
2502 break;
2503 }
2504 if (left) {
2505 kbuf++;
2506 left--;
2507 }
2508 }
2509
2510 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
2511 first = 0;
2512 proc_skip_char(&kbuf, &left, '\n');
2513 }
2514 free_page(page);
2515 } else {
2516 unsigned long bit_a, bit_b = 0;
2517
2518 while (left) {
2519 bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
2520 if (bit_a >= bitmap_len)
2521 break;
2522 bit_b = find_next_zero_bit(bitmap, bitmap_len,
2523 bit_a + 1) - 1;
2524
2525 if (!first) {
2526 err = proc_put_char(&buffer, &left, ',');
2527 if (err)
2528 break;
2529 }
2530 err = proc_put_long(&buffer, &left, bit_a, false);
2531 if (err)
2532 break;
2533 if (bit_a != bit_b) {
2534 err = proc_put_char(&buffer, &left, '-');
2535 if (err)
2536 break;
2537 err = proc_put_long(&buffer, &left, bit_b, false);
2538 if (err)
2539 break;
2540 }
2541
2542 first = 0; bit_b++;
2543 }
2544 if (!err)
2545 err = proc_put_char(&buffer, &left, '\n');
2546 }
2547
2548 if (!err) {
2549 if (write) {
2550 if (*ppos)
2551 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
2552 else
2553 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
2554 }
2555 kfree(tmp_bitmap);
2556 *lenp -= left;
2557 *ppos += *lenp;
2558 return 0;
2559 } else {
2560 kfree(tmp_bitmap);
2561 return err;
2562 }
2563 }
2564
2565 #else /* CONFIG_PROC_SYSCTL */
2566
2567 int proc_dostring(struct ctl_table *table, int write,
2568 void __user *buffer, size_t *lenp, loff_t *ppos)
2569 {
2570 return -ENOSYS;
2571 }
2572
2573 int proc_dointvec(struct ctl_table *table, int write,
2574 void __user *buffer, size_t *lenp, loff_t *ppos)
2575 {
2576 return -ENOSYS;
2577 }
2578
2579 int proc_dointvec_minmax(struct ctl_table *table, int write,
2580 void __user *buffer, size_t *lenp, loff_t *ppos)
2581 {
2582 return -ENOSYS;
2583 }
2584
2585 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2586 void __user *buffer, size_t *lenp, loff_t *ppos)
2587 {
2588 return -ENOSYS;
2589 }
2590
2591 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2592 void __user *buffer, size_t *lenp, loff_t *ppos)
2593 {
2594 return -ENOSYS;
2595 }
2596
2597 int proc_dointvec_ms_jiffies(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_doulongvec_minmax(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_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2610 void __user *buffer,
2611 size_t *lenp, loff_t *ppos)
2612 {
2613 return -ENOSYS;
2614 }
2615
2616
2617 #endif /* CONFIG_PROC_SYSCTL */
2618
2619 /*
2620 * No sense putting this after each symbol definition, twice,
2621 * exception granted :-)
2622 */
2623 EXPORT_SYMBOL(proc_dointvec);
2624 EXPORT_SYMBOL(proc_dointvec_jiffies);
2625 EXPORT_SYMBOL(proc_dointvec_minmax);
2626 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2627 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2628 EXPORT_SYMBOL(proc_dostring);
2629 EXPORT_SYMBOL(proc_doulongvec_minmax);
2630 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
Linux kernel - Deliverables
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