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sched: Move sched.h sysctl bits into separate header
[mirror_ubuntu-bionic-kernel.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 #ifdef CONFIG_SCHED_AUTOGROUP
408 {
409 .procname = "sched_autogroup_enabled",
410 .data = &sysctl_sched_autogroup_enabled,
411 .maxlen = sizeof(unsigned int),
412 .mode = 0644,
413 .proc_handler = proc_dointvec_minmax,
414 .extra1 = &zero,
415 .extra2 = &one,
416 },
417 #endif
418 #ifdef CONFIG_CFS_BANDWIDTH
419 {
420 .procname = "sched_cfs_bandwidth_slice_us",
421 .data = &sysctl_sched_cfs_bandwidth_slice,
422 .maxlen = sizeof(unsigned int),
423 .mode = 0644,
424 .proc_handler = proc_dointvec_minmax,
425 .extra1 = &one,
426 },
427 #endif
428 #ifdef CONFIG_PROVE_LOCKING
429 {
430 .procname = "prove_locking",
431 .data = &prove_locking,
432 .maxlen = sizeof(int),
433 .mode = 0644,
434 .proc_handler = proc_dointvec,
435 },
436 #endif
437 #ifdef CONFIG_LOCK_STAT
438 {
439 .procname = "lock_stat",
440 .data = &lock_stat,
441 .maxlen = sizeof(int),
442 .mode = 0644,
443 .proc_handler = proc_dointvec,
444 },
445 #endif
446 {
447 .procname = "panic",
448 .data = &panic_timeout,
449 .maxlen = sizeof(int),
450 .mode = 0644,
451 .proc_handler = proc_dointvec,
452 },
453 #ifdef CONFIG_COREDUMP
454 {
455 .procname = "core_uses_pid",
456 .data = &core_uses_pid,
457 .maxlen = sizeof(int),
458 .mode = 0644,
459 .proc_handler = proc_dointvec,
460 },
461 {
462 .procname = "core_pattern",
463 .data = core_pattern,
464 .maxlen = CORENAME_MAX_SIZE,
465 .mode = 0644,
466 .proc_handler = proc_dostring_coredump,
467 },
468 {
469 .procname = "core_pipe_limit",
470 .data = &core_pipe_limit,
471 .maxlen = sizeof(unsigned int),
472 .mode = 0644,
473 .proc_handler = proc_dointvec,
474 },
475 #endif
476 #ifdef CONFIG_PROC_SYSCTL
477 {
478 .procname = "tainted",
479 .maxlen = sizeof(long),
480 .mode = 0644,
481 .proc_handler = proc_taint,
482 },
483 #endif
484 #ifdef CONFIG_LATENCYTOP
485 {
486 .procname = "latencytop",
487 .data = &latencytop_enabled,
488 .maxlen = sizeof(int),
489 .mode = 0644,
490 .proc_handler = proc_dointvec,
491 },
492 #endif
493 #ifdef CONFIG_BLK_DEV_INITRD
494 {
495 .procname = "real-root-dev",
496 .data = &real_root_dev,
497 .maxlen = sizeof(int),
498 .mode = 0644,
499 .proc_handler = proc_dointvec,
500 },
501 #endif
502 {
503 .procname = "print-fatal-signals",
504 .data = &print_fatal_signals,
505 .maxlen = sizeof(int),
506 .mode = 0644,
507 .proc_handler = proc_dointvec,
508 },
509 #ifdef CONFIG_SPARC
510 {
511 .procname = "reboot-cmd",
512 .data = reboot_command,
513 .maxlen = 256,
514 .mode = 0644,
515 .proc_handler = proc_dostring,
516 },
517 {
518 .procname = "stop-a",
519 .data = &stop_a_enabled,
520 .maxlen = sizeof (int),
521 .mode = 0644,
522 .proc_handler = proc_dointvec,
523 },
524 {
525 .procname = "scons-poweroff",
526 .data = &scons_pwroff,
527 .maxlen = sizeof (int),
528 .mode = 0644,
529 .proc_handler = proc_dointvec,
530 },
531 #endif
532 #ifdef CONFIG_SPARC64
533 {
534 .procname = "tsb-ratio",
535 .data = &sysctl_tsb_ratio,
536 .maxlen = sizeof (int),
537 .mode = 0644,
538 .proc_handler = proc_dointvec,
539 },
540 #endif
541 #ifdef __hppa__
542 {
543 .procname = "soft-power",
544 .data = &pwrsw_enabled,
545 .maxlen = sizeof (int),
546 .mode = 0644,
547 .proc_handler = proc_dointvec,
548 },
549 {
550 .procname = "unaligned-trap",
551 .data = &unaligned_enabled,
552 .maxlen = sizeof (int),
553 .mode = 0644,
554 .proc_handler = proc_dointvec,
555 },
556 #endif
557 {
558 .procname = "ctrl-alt-del",
559 .data = &C_A_D,
560 .maxlen = sizeof(int),
561 .mode = 0644,
562 .proc_handler = proc_dointvec,
563 },
564 #ifdef CONFIG_FUNCTION_TRACER
565 {
566 .procname = "ftrace_enabled",
567 .data = &ftrace_enabled,
568 .maxlen = sizeof(int),
569 .mode = 0644,
570 .proc_handler = ftrace_enable_sysctl,
571 },
572 #endif
573 #ifdef CONFIG_STACK_TRACER
574 {
575 .procname = "stack_tracer_enabled",
576 .data = &stack_tracer_enabled,
577 .maxlen = sizeof(int),
578 .mode = 0644,
579 .proc_handler = stack_trace_sysctl,
580 },
581 #endif
582 #ifdef CONFIG_TRACING
583 {
584 .procname = "ftrace_dump_on_oops",
585 .data = &ftrace_dump_on_oops,
586 .maxlen = sizeof(int),
587 .mode = 0644,
588 .proc_handler = proc_dointvec,
589 },
590 #endif
591 #ifdef CONFIG_MODULES
592 {
593 .procname = "modprobe",
594 .data = &modprobe_path,
595 .maxlen = KMOD_PATH_LEN,
596 .mode = 0644,
597 .proc_handler = proc_dostring,
598 },
599 {
600 .procname = "modules_disabled",
601 .data = &modules_disabled,
602 .maxlen = sizeof(int),
603 .mode = 0644,
604 /* only handle a transition from default "0" to "1" */
605 .proc_handler = proc_dointvec_minmax,
606 .extra1 = &one,
607 .extra2 = &one,
608 },
609 #endif
610
611 {
612 .procname = "hotplug",
613 .data = &uevent_helper,
614 .maxlen = UEVENT_HELPER_PATH_LEN,
615 .mode = 0644,
616 .proc_handler = proc_dostring,
617 },
618
619 #ifdef CONFIG_CHR_DEV_SG
620 {
621 .procname = "sg-big-buff",
622 .data = &sg_big_buff,
623 .maxlen = sizeof (int),
624 .mode = 0444,
625 .proc_handler = proc_dointvec,
626 },
627 #endif
628 #ifdef CONFIG_BSD_PROCESS_ACCT
629 {
630 .procname = "acct",
631 .data = &acct_parm,
632 .maxlen = 3*sizeof(int),
633 .mode = 0644,
634 .proc_handler = proc_dointvec,
635 },
636 #endif
637 #ifdef CONFIG_MAGIC_SYSRQ
638 {
639 .procname = "sysrq",
640 .data = &__sysrq_enabled,
641 .maxlen = sizeof (int),
642 .mode = 0644,
643 .proc_handler = sysrq_sysctl_handler,
644 },
645 #endif
646 #ifdef CONFIG_PROC_SYSCTL
647 {
648 .procname = "cad_pid",
649 .data = NULL,
650 .maxlen = sizeof (int),
651 .mode = 0600,
652 .proc_handler = proc_do_cad_pid,
653 },
654 #endif
655 {
656 .procname = "threads-max",
657 .data = &max_threads,
658 .maxlen = sizeof(int),
659 .mode = 0644,
660 .proc_handler = proc_dointvec,
661 },
662 {
663 .procname = "random",
664 .mode = 0555,
665 .child = random_table,
666 },
667 {
668 .procname = "usermodehelper",
669 .mode = 0555,
670 .child = usermodehelper_table,
671 },
672 {
673 .procname = "overflowuid",
674 .data = &overflowuid,
675 .maxlen = sizeof(int),
676 .mode = 0644,
677 .proc_handler = proc_dointvec_minmax,
678 .extra1 = &minolduid,
679 .extra2 = &maxolduid,
680 },
681 {
682 .procname = "overflowgid",
683 .data = &overflowgid,
684 .maxlen = sizeof(int),
685 .mode = 0644,
686 .proc_handler = proc_dointvec_minmax,
687 .extra1 = &minolduid,
688 .extra2 = &maxolduid,
689 },
690 #ifdef CONFIG_S390
691 #ifdef CONFIG_MATHEMU
692 {
693 .procname = "ieee_emulation_warnings",
694 .data = &sysctl_ieee_emulation_warnings,
695 .maxlen = sizeof(int),
696 .mode = 0644,
697 .proc_handler = proc_dointvec,
698 },
699 #endif
700 {
701 .procname = "userprocess_debug",
702 .data = &show_unhandled_signals,
703 .maxlen = sizeof(int),
704 .mode = 0644,
705 .proc_handler = proc_dointvec,
706 },
707 #endif
708 {
709 .procname = "pid_max",
710 .data = &pid_max,
711 .maxlen = sizeof (int),
712 .mode = 0644,
713 .proc_handler = proc_dointvec_minmax,
714 .extra1 = &pid_max_min,
715 .extra2 = &pid_max_max,
716 },
717 {
718 .procname = "panic_on_oops",
719 .data = &panic_on_oops,
720 .maxlen = sizeof(int),
721 .mode = 0644,
722 .proc_handler = proc_dointvec,
723 },
724 #if defined CONFIG_PRINTK
725 {
726 .procname = "printk",
727 .data = &console_loglevel,
728 .maxlen = 4*sizeof(int),
729 .mode = 0644,
730 .proc_handler = proc_dointvec,
731 },
732 {
733 .procname = "printk_ratelimit",
734 .data = &printk_ratelimit_state.interval,
735 .maxlen = sizeof(int),
736 .mode = 0644,
737 .proc_handler = proc_dointvec_jiffies,
738 },
739 {
740 .procname = "printk_ratelimit_burst",
741 .data = &printk_ratelimit_state.burst,
742 .maxlen = sizeof(int),
743 .mode = 0644,
744 .proc_handler = proc_dointvec,
745 },
746 {
747 .procname = "printk_delay",
748 .data = &printk_delay_msec,
749 .maxlen = sizeof(int),
750 .mode = 0644,
751 .proc_handler = proc_dointvec_minmax,
752 .extra1 = &zero,
753 .extra2 = &ten_thousand,
754 },
755 {
756 .procname = "dmesg_restrict",
757 .data = &dmesg_restrict,
758 .maxlen = sizeof(int),
759 .mode = 0644,
760 .proc_handler = proc_dointvec_minmax_sysadmin,
761 .extra1 = &zero,
762 .extra2 = &one,
763 },
764 {
765 .procname = "kptr_restrict",
766 .data = &kptr_restrict,
767 .maxlen = sizeof(int),
768 .mode = 0644,
769 .proc_handler = proc_dointvec_minmax_sysadmin,
770 .extra1 = &zero,
771 .extra2 = &two,
772 },
773 #endif
774 {
775 .procname = "ngroups_max",
776 .data = &ngroups_max,
777 .maxlen = sizeof (int),
778 .mode = 0444,
779 .proc_handler = proc_dointvec,
780 },
781 {
782 .procname = "cap_last_cap",
783 .data = (void *)&cap_last_cap,
784 .maxlen = sizeof(int),
785 .mode = 0444,
786 .proc_handler = proc_dointvec,
787 },
788 #if defined(CONFIG_LOCKUP_DETECTOR)
789 {
790 .procname = "watchdog",
791 .data = &watchdog_enabled,
792 .maxlen = sizeof (int),
793 .mode = 0644,
794 .proc_handler = proc_dowatchdog,
795 .extra1 = &zero,
796 .extra2 = &one,
797 },
798 {
799 .procname = "watchdog_thresh",
800 .data = &watchdog_thresh,
801 .maxlen = sizeof(int),
802 .mode = 0644,
803 .proc_handler = proc_dowatchdog,
804 .extra1 = &neg_one,
805 .extra2 = &sixty,
806 },
807 {
808 .procname = "softlockup_panic",
809 .data = &softlockup_panic,
810 .maxlen = sizeof(int),
811 .mode = 0644,
812 .proc_handler = proc_dointvec_minmax,
813 .extra1 = &zero,
814 .extra2 = &one,
815 },
816 {
817 .procname = "nmi_watchdog",
818 .data = &watchdog_enabled,
819 .maxlen = sizeof (int),
820 .mode = 0644,
821 .proc_handler = proc_dowatchdog,
822 .extra1 = &zero,
823 .extra2 = &one,
824 },
825 #endif
826 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
827 {
828 .procname = "unknown_nmi_panic",
829 .data = &unknown_nmi_panic,
830 .maxlen = sizeof (int),
831 .mode = 0644,
832 .proc_handler = proc_dointvec,
833 },
834 #endif
835 #if defined(CONFIG_X86)
836 {
837 .procname = "panic_on_unrecovered_nmi",
838 .data = &panic_on_unrecovered_nmi,
839 .maxlen = sizeof(int),
840 .mode = 0644,
841 .proc_handler = proc_dointvec,
842 },
843 {
844 .procname = "panic_on_io_nmi",
845 .data = &panic_on_io_nmi,
846 .maxlen = sizeof(int),
847 .mode = 0644,
848 .proc_handler = proc_dointvec,
849 },
850 #ifdef CONFIG_DEBUG_STACKOVERFLOW
851 {
852 .procname = "panic_on_stackoverflow",
853 .data = &sysctl_panic_on_stackoverflow,
854 .maxlen = sizeof(int),
855 .mode = 0644,
856 .proc_handler = proc_dointvec,
857 },
858 #endif
859 {
860 .procname = "bootloader_type",
861 .data = &bootloader_type,
862 .maxlen = sizeof (int),
863 .mode = 0444,
864 .proc_handler = proc_dointvec,
865 },
866 {
867 .procname = "bootloader_version",
868 .data = &bootloader_version,
869 .maxlen = sizeof (int),
870 .mode = 0444,
871 .proc_handler = proc_dointvec,
872 },
873 {
874 .procname = "kstack_depth_to_print",
875 .data = &kstack_depth_to_print,
876 .maxlen = sizeof(int),
877 .mode = 0644,
878 .proc_handler = proc_dointvec,
879 },
880 {
881 .procname = "io_delay_type",
882 .data = &io_delay_type,
883 .maxlen = sizeof(int),
884 .mode = 0644,
885 .proc_handler = proc_dointvec,
886 },
887 #endif
888 #if defined(CONFIG_MMU)
889 {
890 .procname = "randomize_va_space",
891 .data = &randomize_va_space,
892 .maxlen = sizeof(int),
893 .mode = 0644,
894 .proc_handler = proc_dointvec,
895 },
896 #endif
897 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
898 {
899 .procname = "spin_retry",
900 .data = &spin_retry,
901 .maxlen = sizeof (int),
902 .mode = 0644,
903 .proc_handler = proc_dointvec,
904 },
905 #endif
906 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
907 {
908 .procname = "acpi_video_flags",
909 .data = &acpi_realmode_flags,
910 .maxlen = sizeof (unsigned long),
911 .mode = 0644,
912 .proc_handler = proc_doulongvec_minmax,
913 },
914 #endif
915 #ifdef CONFIG_IA64
916 {
917 .procname = "ignore-unaligned-usertrap",
918 .data = &no_unaligned_warning,
919 .maxlen = sizeof (int),
920 .mode = 0644,
921 .proc_handler = proc_dointvec,
922 },
923 {
924 .procname = "unaligned-dump-stack",
925 .data = &unaligned_dump_stack,
926 .maxlen = sizeof (int),
927 .mode = 0644,
928 .proc_handler = proc_dointvec,
929 },
930 #endif
931 #ifdef CONFIG_DETECT_HUNG_TASK
932 {
933 .procname = "hung_task_panic",
934 .data = &sysctl_hung_task_panic,
935 .maxlen = sizeof(int),
936 .mode = 0644,
937 .proc_handler = proc_dointvec_minmax,
938 .extra1 = &zero,
939 .extra2 = &one,
940 },
941 {
942 .procname = "hung_task_check_count",
943 .data = &sysctl_hung_task_check_count,
944 .maxlen = sizeof(unsigned long),
945 .mode = 0644,
946 .proc_handler = proc_doulongvec_minmax,
947 },
948 {
949 .procname = "hung_task_timeout_secs",
950 .data = &sysctl_hung_task_timeout_secs,
951 .maxlen = sizeof(unsigned long),
952 .mode = 0644,
953 .proc_handler = proc_dohung_task_timeout_secs,
954 },
955 {
956 .procname = "hung_task_warnings",
957 .data = &sysctl_hung_task_warnings,
958 .maxlen = sizeof(unsigned long),
959 .mode = 0644,
960 .proc_handler = proc_doulongvec_minmax,
961 },
962 #endif
963 #ifdef CONFIG_COMPAT
964 {
965 .procname = "compat-log",
966 .data = &compat_log,
967 .maxlen = sizeof (int),
968 .mode = 0644,
969 .proc_handler = proc_dointvec,
970 },
971 #endif
972 #ifdef CONFIG_RT_MUTEXES
973 {
974 .procname = "max_lock_depth",
975 .data = &max_lock_depth,
976 .maxlen = sizeof(int),
977 .mode = 0644,
978 .proc_handler = proc_dointvec,
979 },
980 #endif
981 {
982 .procname = "poweroff_cmd",
983 .data = &poweroff_cmd,
984 .maxlen = POWEROFF_CMD_PATH_LEN,
985 .mode = 0644,
986 .proc_handler = proc_dostring,
987 },
988 #ifdef CONFIG_KEYS
989 {
990 .procname = "keys",
991 .mode = 0555,
992 .child = key_sysctls,
993 },
994 #endif
995 #ifdef CONFIG_RCU_TORTURE_TEST
996 {
997 .procname = "rcutorture_runnable",
998 .data = &rcutorture_runnable,
999 .maxlen = sizeof(int),
1000 .mode = 0644,
1001 .proc_handler = proc_dointvec,
1002 },
1003 #endif
1004 #ifdef CONFIG_PERF_EVENTS
1005 /*
1006 * User-space scripts rely on the existence of this file
1007 * as a feature check for perf_events being enabled.
1008 *
1009 * So it's an ABI, do not remove!
1010 */
1011 {
1012 .procname = "perf_event_paranoid",
1013 .data = &sysctl_perf_event_paranoid,
1014 .maxlen = sizeof(sysctl_perf_event_paranoid),
1015 .mode = 0644,
1016 .proc_handler = proc_dointvec,
1017 },
1018 {
1019 .procname = "perf_event_mlock_kb",
1020 .data = &sysctl_perf_event_mlock,
1021 .maxlen = sizeof(sysctl_perf_event_mlock),
1022 .mode = 0644,
1023 .proc_handler = proc_dointvec,
1024 },
1025 {
1026 .procname = "perf_event_max_sample_rate",
1027 .data = &sysctl_perf_event_sample_rate,
1028 .maxlen = sizeof(sysctl_perf_event_sample_rate),
1029 .mode = 0644,
1030 .proc_handler = perf_proc_update_handler,
1031 },
1032 #endif
1033 #ifdef CONFIG_KMEMCHECK
1034 {
1035 .procname = "kmemcheck",
1036 .data = &kmemcheck_enabled,
1037 .maxlen = sizeof(int),
1038 .mode = 0644,
1039 .proc_handler = proc_dointvec,
1040 },
1041 #endif
1042 #ifdef CONFIG_BLOCK
1043 {
1044 .procname = "blk_iopoll",
1045 .data = &blk_iopoll_enabled,
1046 .maxlen = sizeof(int),
1047 .mode = 0644,
1048 .proc_handler = proc_dointvec,
1049 },
1050 #endif
1051 { }
1052 };
1053
1054 static struct ctl_table vm_table[] = {
1055 {
1056 .procname = "overcommit_memory",
1057 .data = &sysctl_overcommit_memory,
1058 .maxlen = sizeof(sysctl_overcommit_memory),
1059 .mode = 0644,
1060 .proc_handler = proc_dointvec_minmax,
1061 .extra1 = &zero,
1062 .extra2 = &two,
1063 },
1064 {
1065 .procname = "panic_on_oom",
1066 .data = &sysctl_panic_on_oom,
1067 .maxlen = sizeof(sysctl_panic_on_oom),
1068 .mode = 0644,
1069 .proc_handler = proc_dointvec_minmax,
1070 .extra1 = &zero,
1071 .extra2 = &two,
1072 },
1073 {
1074 .procname = "oom_kill_allocating_task",
1075 .data = &sysctl_oom_kill_allocating_task,
1076 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
1077 .mode = 0644,
1078 .proc_handler = proc_dointvec,
1079 },
1080 {
1081 .procname = "oom_dump_tasks",
1082 .data = &sysctl_oom_dump_tasks,
1083 .maxlen = sizeof(sysctl_oom_dump_tasks),
1084 .mode = 0644,
1085 .proc_handler = proc_dointvec,
1086 },
1087 {
1088 .procname = "overcommit_ratio",
1089 .data = &sysctl_overcommit_ratio,
1090 .maxlen = sizeof(sysctl_overcommit_ratio),
1091 .mode = 0644,
1092 .proc_handler = proc_dointvec,
1093 },
1094 {
1095 .procname = "page-cluster",
1096 .data = &page_cluster,
1097 .maxlen = sizeof(int),
1098 .mode = 0644,
1099 .proc_handler = proc_dointvec_minmax,
1100 .extra1 = &zero,
1101 },
1102 {
1103 .procname = "dirty_background_ratio",
1104 .data = &dirty_background_ratio,
1105 .maxlen = sizeof(dirty_background_ratio),
1106 .mode = 0644,
1107 .proc_handler = dirty_background_ratio_handler,
1108 .extra1 = &zero,
1109 .extra2 = &one_hundred,
1110 },
1111 {
1112 .procname = "dirty_background_bytes",
1113 .data = &dirty_background_bytes,
1114 .maxlen = sizeof(dirty_background_bytes),
1115 .mode = 0644,
1116 .proc_handler = dirty_background_bytes_handler,
1117 .extra1 = &one_ul,
1118 },
1119 {
1120 .procname = "dirty_ratio",
1121 .data = &vm_dirty_ratio,
1122 .maxlen = sizeof(vm_dirty_ratio),
1123 .mode = 0644,
1124 .proc_handler = dirty_ratio_handler,
1125 .extra1 = &zero,
1126 .extra2 = &one_hundred,
1127 },
1128 {
1129 .procname = "dirty_bytes",
1130 .data = &vm_dirty_bytes,
1131 .maxlen = sizeof(vm_dirty_bytes),
1132 .mode = 0644,
1133 .proc_handler = dirty_bytes_handler,
1134 .extra1 = &dirty_bytes_min,
1135 },
1136 {
1137 .procname = "dirty_writeback_centisecs",
1138 .data = &dirty_writeback_interval,
1139 .maxlen = sizeof(dirty_writeback_interval),
1140 .mode = 0644,
1141 .proc_handler = dirty_writeback_centisecs_handler,
1142 },
1143 {
1144 .procname = "dirty_expire_centisecs",
1145 .data = &dirty_expire_interval,
1146 .maxlen = sizeof(dirty_expire_interval),
1147 .mode = 0644,
1148 .proc_handler = proc_dointvec_minmax,
1149 .extra1 = &zero,
1150 },
1151 {
1152 .procname = "nr_pdflush_threads",
1153 .mode = 0444 /* read-only */,
1154 .proc_handler = pdflush_proc_obsolete,
1155 },
1156 {
1157 .procname = "swappiness",
1158 .data = &vm_swappiness,
1159 .maxlen = sizeof(vm_swappiness),
1160 .mode = 0644,
1161 .proc_handler = proc_dointvec_minmax,
1162 .extra1 = &zero,
1163 .extra2 = &one_hundred,
1164 },
1165 #ifdef CONFIG_HUGETLB_PAGE
1166 {
1167 .procname = "nr_hugepages",
1168 .data = NULL,
1169 .maxlen = sizeof(unsigned long),
1170 .mode = 0644,
1171 .proc_handler = hugetlb_sysctl_handler,
1172 .extra1 = (void *)&hugetlb_zero,
1173 .extra2 = (void *)&hugetlb_infinity,
1174 },
1175 #ifdef CONFIG_NUMA
1176 {
1177 .procname = "nr_hugepages_mempolicy",
1178 .data = NULL,
1179 .maxlen = sizeof(unsigned long),
1180 .mode = 0644,
1181 .proc_handler = &hugetlb_mempolicy_sysctl_handler,
1182 .extra1 = (void *)&hugetlb_zero,
1183 .extra2 = (void *)&hugetlb_infinity,
1184 },
1185 #endif
1186 {
1187 .procname = "hugetlb_shm_group",
1188 .data = &sysctl_hugetlb_shm_group,
1189 .maxlen = sizeof(gid_t),
1190 .mode = 0644,
1191 .proc_handler = proc_dointvec,
1192 },
1193 {
1194 .procname = "hugepages_treat_as_movable",
1195 .data = &hugepages_treat_as_movable,
1196 .maxlen = sizeof(int),
1197 .mode = 0644,
1198 .proc_handler = hugetlb_treat_movable_handler,
1199 },
1200 {
1201 .procname = "nr_overcommit_hugepages",
1202 .data = NULL,
1203 .maxlen = sizeof(unsigned long),
1204 .mode = 0644,
1205 .proc_handler = hugetlb_overcommit_handler,
1206 .extra1 = (void *)&hugetlb_zero,
1207 .extra2 = (void *)&hugetlb_infinity,
1208 },
1209 #endif
1210 {
1211 .procname = "lowmem_reserve_ratio",
1212 .data = &sysctl_lowmem_reserve_ratio,
1213 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1214 .mode = 0644,
1215 .proc_handler = lowmem_reserve_ratio_sysctl_handler,
1216 },
1217 {
1218 .procname = "drop_caches",
1219 .data = &sysctl_drop_caches,
1220 .maxlen = sizeof(int),
1221 .mode = 0644,
1222 .proc_handler = drop_caches_sysctl_handler,
1223 .extra1 = &one,
1224 .extra2 = &three,
1225 },
1226 #ifdef CONFIG_COMPACTION
1227 {
1228 .procname = "compact_memory",
1229 .data = &sysctl_compact_memory,
1230 .maxlen = sizeof(int),
1231 .mode = 0200,
1232 .proc_handler = sysctl_compaction_handler,
1233 },
1234 {
1235 .procname = "extfrag_threshold",
1236 .data = &sysctl_extfrag_threshold,
1237 .maxlen = sizeof(int),
1238 .mode = 0644,
1239 .proc_handler = sysctl_extfrag_handler,
1240 .extra1 = &min_extfrag_threshold,
1241 .extra2 = &max_extfrag_threshold,
1242 },
1243
1244 #endif /* CONFIG_COMPACTION */
1245 {
1246 .procname = "min_free_kbytes",
1247 .data = &min_free_kbytes,
1248 .maxlen = sizeof(min_free_kbytes),
1249 .mode = 0644,
1250 .proc_handler = min_free_kbytes_sysctl_handler,
1251 .extra1 = &zero,
1252 },
1253 {
1254 .procname = "percpu_pagelist_fraction",
1255 .data = &percpu_pagelist_fraction,
1256 .maxlen = sizeof(percpu_pagelist_fraction),
1257 .mode = 0644,
1258 .proc_handler = percpu_pagelist_fraction_sysctl_handler,
1259 .extra1 = &min_percpu_pagelist_fract,
1260 },
1261 #ifdef CONFIG_MMU
1262 {
1263 .procname = "max_map_count",
1264 .data = &sysctl_max_map_count,
1265 .maxlen = sizeof(sysctl_max_map_count),
1266 .mode = 0644,
1267 .proc_handler = proc_dointvec_minmax,
1268 .extra1 = &zero,
1269 },
1270 #else
1271 {
1272 .procname = "nr_trim_pages",
1273 .data = &sysctl_nr_trim_pages,
1274 .maxlen = sizeof(sysctl_nr_trim_pages),
1275 .mode = 0644,
1276 .proc_handler = proc_dointvec_minmax,
1277 .extra1 = &zero,
1278 },
1279 #endif
1280 {
1281 .procname = "laptop_mode",
1282 .data = &laptop_mode,
1283 .maxlen = sizeof(laptop_mode),
1284 .mode = 0644,
1285 .proc_handler = proc_dointvec_jiffies,
1286 },
1287 {
1288 .procname = "block_dump",
1289 .data = &block_dump,
1290 .maxlen = sizeof(block_dump),
1291 .mode = 0644,
1292 .proc_handler = proc_dointvec,
1293 .extra1 = &zero,
1294 },
1295 {
1296 .procname = "vfs_cache_pressure",
1297 .data = &sysctl_vfs_cache_pressure,
1298 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1299 .mode = 0644,
1300 .proc_handler = proc_dointvec,
1301 .extra1 = &zero,
1302 },
1303 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1304 {
1305 .procname = "legacy_va_layout",
1306 .data = &sysctl_legacy_va_layout,
1307 .maxlen = sizeof(sysctl_legacy_va_layout),
1308 .mode = 0644,
1309 .proc_handler = proc_dointvec,
1310 .extra1 = &zero,
1311 },
1312 #endif
1313 #ifdef CONFIG_NUMA
1314 {
1315 .procname = "zone_reclaim_mode",
1316 .data = &zone_reclaim_mode,
1317 .maxlen = sizeof(zone_reclaim_mode),
1318 .mode = 0644,
1319 .proc_handler = proc_dointvec,
1320 .extra1 = &zero,
1321 },
1322 {
1323 .procname = "min_unmapped_ratio",
1324 .data = &sysctl_min_unmapped_ratio,
1325 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1326 .mode = 0644,
1327 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler,
1328 .extra1 = &zero,
1329 .extra2 = &one_hundred,
1330 },
1331 {
1332 .procname = "min_slab_ratio",
1333 .data = &sysctl_min_slab_ratio,
1334 .maxlen = sizeof(sysctl_min_slab_ratio),
1335 .mode = 0644,
1336 .proc_handler = sysctl_min_slab_ratio_sysctl_handler,
1337 .extra1 = &zero,
1338 .extra2 = &one_hundred,
1339 },
1340 #endif
1341 #ifdef CONFIG_SMP
1342 {
1343 .procname = "stat_interval",
1344 .data = &sysctl_stat_interval,
1345 .maxlen = sizeof(sysctl_stat_interval),
1346 .mode = 0644,
1347 .proc_handler = proc_dointvec_jiffies,
1348 },
1349 #endif
1350 #ifdef CONFIG_MMU
1351 {
1352 .procname = "mmap_min_addr",
1353 .data = &dac_mmap_min_addr,
1354 .maxlen = sizeof(unsigned long),
1355 .mode = 0644,
1356 .proc_handler = mmap_min_addr_handler,
1357 },
1358 #endif
1359 #ifdef CONFIG_NUMA
1360 {
1361 .procname = "numa_zonelist_order",
1362 .data = &numa_zonelist_order,
1363 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1364 .mode = 0644,
1365 .proc_handler = numa_zonelist_order_handler,
1366 },
1367 #endif
1368 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1369 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1370 {
1371 .procname = "vdso_enabled",
1372 .data = &vdso_enabled,
1373 .maxlen = sizeof(vdso_enabled),
1374 .mode = 0644,
1375 .proc_handler = proc_dointvec,
1376 .extra1 = &zero,
1377 },
1378 #endif
1379 #ifdef CONFIG_HIGHMEM
1380 {
1381 .procname = "highmem_is_dirtyable",
1382 .data = &vm_highmem_is_dirtyable,
1383 .maxlen = sizeof(vm_highmem_is_dirtyable),
1384 .mode = 0644,
1385 .proc_handler = proc_dointvec_minmax,
1386 .extra1 = &zero,
1387 .extra2 = &one,
1388 },
1389 #endif
1390 {
1391 .procname = "scan_unevictable_pages",
1392 .data = &scan_unevictable_pages,
1393 .maxlen = sizeof(scan_unevictable_pages),
1394 .mode = 0644,
1395 .proc_handler = scan_unevictable_handler,
1396 },
1397 #ifdef CONFIG_MEMORY_FAILURE
1398 {
1399 .procname = "memory_failure_early_kill",
1400 .data = &sysctl_memory_failure_early_kill,
1401 .maxlen = sizeof(sysctl_memory_failure_early_kill),
1402 .mode = 0644,
1403 .proc_handler = proc_dointvec_minmax,
1404 .extra1 = &zero,
1405 .extra2 = &one,
1406 },
1407 {
1408 .procname = "memory_failure_recovery",
1409 .data = &sysctl_memory_failure_recovery,
1410 .maxlen = sizeof(sysctl_memory_failure_recovery),
1411 .mode = 0644,
1412 .proc_handler = proc_dointvec_minmax,
1413 .extra1 = &zero,
1414 .extra2 = &one,
1415 },
1416 #endif
1417 { }
1418 };
1419
1420 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1421 static struct ctl_table binfmt_misc_table[] = {
1422 { }
1423 };
1424 #endif
1425
1426 static struct ctl_table fs_table[] = {
1427 {
1428 .procname = "inode-nr",
1429 .data = &inodes_stat,
1430 .maxlen = 2*sizeof(int),
1431 .mode = 0444,
1432 .proc_handler = proc_nr_inodes,
1433 },
1434 {
1435 .procname = "inode-state",
1436 .data = &inodes_stat,
1437 .maxlen = 7*sizeof(int),
1438 .mode = 0444,
1439 .proc_handler = proc_nr_inodes,
1440 },
1441 {
1442 .procname = "file-nr",
1443 .data = &files_stat,
1444 .maxlen = sizeof(files_stat),
1445 .mode = 0444,
1446 .proc_handler = proc_nr_files,
1447 },
1448 {
1449 .procname = "file-max",
1450 .data = &files_stat.max_files,
1451 .maxlen = sizeof(files_stat.max_files),
1452 .mode = 0644,
1453 .proc_handler = proc_doulongvec_minmax,
1454 },
1455 {
1456 .procname = "nr_open",
1457 .data = &sysctl_nr_open,
1458 .maxlen = sizeof(int),
1459 .mode = 0644,
1460 .proc_handler = proc_dointvec_minmax,
1461 .extra1 = &sysctl_nr_open_min,
1462 .extra2 = &sysctl_nr_open_max,
1463 },
1464 {
1465 .procname = "dentry-state",
1466 .data = &dentry_stat,
1467 .maxlen = 6*sizeof(int),
1468 .mode = 0444,
1469 .proc_handler = proc_nr_dentry,
1470 },
1471 {
1472 .procname = "overflowuid",
1473 .data = &fs_overflowuid,
1474 .maxlen = sizeof(int),
1475 .mode = 0644,
1476 .proc_handler = proc_dointvec_minmax,
1477 .extra1 = &minolduid,
1478 .extra2 = &maxolduid,
1479 },
1480 {
1481 .procname = "overflowgid",
1482 .data = &fs_overflowgid,
1483 .maxlen = sizeof(int),
1484 .mode = 0644,
1485 .proc_handler = proc_dointvec_minmax,
1486 .extra1 = &minolduid,
1487 .extra2 = &maxolduid,
1488 },
1489 #ifdef CONFIG_FILE_LOCKING
1490 {
1491 .procname = "leases-enable",
1492 .data = &leases_enable,
1493 .maxlen = sizeof(int),
1494 .mode = 0644,
1495 .proc_handler = proc_dointvec,
1496 },
1497 #endif
1498 #ifdef CONFIG_DNOTIFY
1499 {
1500 .procname = "dir-notify-enable",
1501 .data = &dir_notify_enable,
1502 .maxlen = sizeof(int),
1503 .mode = 0644,
1504 .proc_handler = proc_dointvec,
1505 },
1506 #endif
1507 #ifdef CONFIG_MMU
1508 #ifdef CONFIG_FILE_LOCKING
1509 {
1510 .procname = "lease-break-time",
1511 .data = &lease_break_time,
1512 .maxlen = sizeof(int),
1513 .mode = 0644,
1514 .proc_handler = proc_dointvec,
1515 },
1516 #endif
1517 #ifdef CONFIG_AIO
1518 {
1519 .procname = "aio-nr",
1520 .data = &aio_nr,
1521 .maxlen = sizeof(aio_nr),
1522 .mode = 0444,
1523 .proc_handler = proc_doulongvec_minmax,
1524 },
1525 {
1526 .procname = "aio-max-nr",
1527 .data = &aio_max_nr,
1528 .maxlen = sizeof(aio_max_nr),
1529 .mode = 0644,
1530 .proc_handler = proc_doulongvec_minmax,
1531 },
1532 #endif /* CONFIG_AIO */
1533 #ifdef CONFIG_INOTIFY_USER
1534 {
1535 .procname = "inotify",
1536 .mode = 0555,
1537 .child = inotify_table,
1538 },
1539 #endif
1540 #ifdef CONFIG_EPOLL
1541 {
1542 .procname = "epoll",
1543 .mode = 0555,
1544 .child = epoll_table,
1545 },
1546 #endif
1547 #endif
1548 {
1549 .procname = "protected_symlinks",
1550 .data = &sysctl_protected_symlinks,
1551 .maxlen = sizeof(int),
1552 .mode = 0600,
1553 .proc_handler = proc_dointvec_minmax,
1554 .extra1 = &zero,
1555 .extra2 = &one,
1556 },
1557 {
1558 .procname = "protected_hardlinks",
1559 .data = &sysctl_protected_hardlinks,
1560 .maxlen = sizeof(int),
1561 .mode = 0600,
1562 .proc_handler = proc_dointvec_minmax,
1563 .extra1 = &zero,
1564 .extra2 = &one,
1565 },
1566 {
1567 .procname = "suid_dumpable",
1568 .data = &suid_dumpable,
1569 .maxlen = sizeof(int),
1570 .mode = 0644,
1571 .proc_handler = proc_dointvec_minmax_coredump,
1572 .extra1 = &zero,
1573 .extra2 = &two,
1574 },
1575 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1576 {
1577 .procname = "binfmt_misc",
1578 .mode = 0555,
1579 .child = binfmt_misc_table,
1580 },
1581 #endif
1582 {
1583 .procname = "pipe-max-size",
1584 .data = &pipe_max_size,
1585 .maxlen = sizeof(int),
1586 .mode = 0644,
1587 .proc_handler = &pipe_proc_fn,
1588 .extra1 = &pipe_min_size,
1589 },
1590 { }
1591 };
1592
1593 static struct ctl_table debug_table[] = {
1594 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
1595 {
1596 .procname = "exception-trace",
1597 .data = &show_unhandled_signals,
1598 .maxlen = sizeof(int),
1599 .mode = 0644,
1600 .proc_handler = proc_dointvec
1601 },
1602 #endif
1603 #if defined(CONFIG_OPTPROBES)
1604 {
1605 .procname = "kprobes-optimization",
1606 .data = &sysctl_kprobes_optimization,
1607 .maxlen = sizeof(int),
1608 .mode = 0644,
1609 .proc_handler = proc_kprobes_optimization_handler,
1610 .extra1 = &zero,
1611 .extra2 = &one,
1612 },
1613 #endif
1614 { }
1615 };
1616
1617 static struct ctl_table dev_table[] = {
1618 { }
1619 };
1620
1621 int __init sysctl_init(void)
1622 {
1623 struct ctl_table_header *hdr;
1624
1625 hdr = register_sysctl_table(sysctl_base_table);
1626 kmemleak_not_leak(hdr);
1627 return 0;
1628 }
1629
1630 #endif /* CONFIG_SYSCTL */
1631
1632 /*
1633 * /proc/sys support
1634 */
1635
1636 #ifdef CONFIG_PROC_SYSCTL
1637
1638 static int _proc_do_string(void* data, int maxlen, int write,
1639 void __user *buffer,
1640 size_t *lenp, loff_t *ppos)
1641 {
1642 size_t len;
1643 char __user *p;
1644 char c;
1645
1646 if (!data || !maxlen || !*lenp) {
1647 *lenp = 0;
1648 return 0;
1649 }
1650
1651 if (write) {
1652 len = 0;
1653 p = buffer;
1654 while (len < *lenp) {
1655 if (get_user(c, p++))
1656 return -EFAULT;
1657 if (c == 0 || c == '\n')
1658 break;
1659 len++;
1660 }
1661 if (len >= maxlen)
1662 len = maxlen-1;
1663 if(copy_from_user(data, buffer, len))
1664 return -EFAULT;
1665 ((char *) data)[len] = 0;
1666 *ppos += *lenp;
1667 } else {
1668 len = strlen(data);
1669 if (len > maxlen)
1670 len = maxlen;
1671
1672 if (*ppos > len) {
1673 *lenp = 0;
1674 return 0;
1675 }
1676
1677 data += *ppos;
1678 len -= *ppos;
1679
1680 if (len > *lenp)
1681 len = *lenp;
1682 if (len)
1683 if(copy_to_user(buffer, data, len))
1684 return -EFAULT;
1685 if (len < *lenp) {
1686 if(put_user('\n', ((char __user *) buffer) + len))
1687 return -EFAULT;
1688 len++;
1689 }
1690 *lenp = len;
1691 *ppos += len;
1692 }
1693 return 0;
1694 }
1695
1696 /**
1697 * proc_dostring - read a string sysctl
1698 * @table: the sysctl table
1699 * @write: %TRUE if this is a write to the sysctl file
1700 * @buffer: the user buffer
1701 * @lenp: the size of the user buffer
1702 * @ppos: file position
1703 *
1704 * Reads/writes a string from/to the user buffer. If the kernel
1705 * buffer provided is not large enough to hold the string, the
1706 * string is truncated. The copied string is %NULL-terminated.
1707 * If the string is being read by the user process, it is copied
1708 * and a newline '\n' is added. It is truncated if the buffer is
1709 * not large enough.
1710 *
1711 * Returns 0 on success.
1712 */
1713 int proc_dostring(struct ctl_table *table, int write,
1714 void __user *buffer, size_t *lenp, loff_t *ppos)
1715 {
1716 return _proc_do_string(table->data, table->maxlen, write,
1717 buffer, lenp, ppos);
1718 }
1719
1720 static size_t proc_skip_spaces(char **buf)
1721 {
1722 size_t ret;
1723 char *tmp = skip_spaces(*buf);
1724 ret = tmp - *buf;
1725 *buf = tmp;
1726 return ret;
1727 }
1728
1729 static void proc_skip_char(char **buf, size_t *size, const char v)
1730 {
1731 while (*size) {
1732 if (**buf != v)
1733 break;
1734 (*size)--;
1735 (*buf)++;
1736 }
1737 }
1738
1739 #define TMPBUFLEN 22
1740 /**
1741 * proc_get_long - reads an ASCII formatted integer from a user buffer
1742 *
1743 * @buf: a kernel buffer
1744 * @size: size of the kernel buffer
1745 * @val: this is where the number will be stored
1746 * @neg: set to %TRUE if number is negative
1747 * @perm_tr: a vector which contains the allowed trailers
1748 * @perm_tr_len: size of the perm_tr vector
1749 * @tr: pointer to store the trailer character
1750 *
1751 * In case of success %0 is returned and @buf and @size are updated with
1752 * the amount of bytes read. If @tr is non-NULL and a trailing
1753 * character exists (size is non-zero after returning from this
1754 * function), @tr is updated with the trailing character.
1755 */
1756 static int proc_get_long(char **buf, size_t *size,
1757 unsigned long *val, bool *neg,
1758 const char *perm_tr, unsigned perm_tr_len, char *tr)
1759 {
1760 int len;
1761 char *p, tmp[TMPBUFLEN];
1762
1763 if (!*size)
1764 return -EINVAL;
1765
1766 len = *size;
1767 if (len > TMPBUFLEN - 1)
1768 len = TMPBUFLEN - 1;
1769
1770 memcpy(tmp, *buf, len);
1771
1772 tmp[len] = 0;
1773 p = tmp;
1774 if (*p == '-' && *size > 1) {
1775 *neg = true;
1776 p++;
1777 } else
1778 *neg = false;
1779 if (!isdigit(*p))
1780 return -EINVAL;
1781
1782 *val = simple_strtoul(p, &p, 0);
1783
1784 len = p - tmp;
1785
1786 /* We don't know if the next char is whitespace thus we may accept
1787 * invalid integers (e.g. 1234...a) or two integers instead of one
1788 * (e.g. 123...1). So lets not allow such large numbers. */
1789 if (len == TMPBUFLEN - 1)
1790 return -EINVAL;
1791
1792 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
1793 return -EINVAL;
1794
1795 if (tr && (len < *size))
1796 *tr = *p;
1797
1798 *buf += len;
1799 *size -= len;
1800
1801 return 0;
1802 }
1803
1804 /**
1805 * proc_put_long - converts an integer to a decimal ASCII formatted string
1806 *
1807 * @buf: the user buffer
1808 * @size: the size of the user buffer
1809 * @val: the integer to be converted
1810 * @neg: sign of the number, %TRUE for negative
1811 *
1812 * In case of success %0 is returned and @buf and @size are updated with
1813 * the amount of bytes written.
1814 */
1815 static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
1816 bool neg)
1817 {
1818 int len;
1819 char tmp[TMPBUFLEN], *p = tmp;
1820
1821 sprintf(p, "%s%lu", neg ? "-" : "", val);
1822 len = strlen(tmp);
1823 if (len > *size)
1824 len = *size;
1825 if (copy_to_user(*buf, tmp, len))
1826 return -EFAULT;
1827 *size -= len;
1828 *buf += len;
1829 return 0;
1830 }
1831 #undef TMPBUFLEN
1832
1833 static int proc_put_char(void __user **buf, size_t *size, char c)
1834 {
1835 if (*size) {
1836 char __user **buffer = (char __user **)buf;
1837 if (put_user(c, *buffer))
1838 return -EFAULT;
1839 (*size)--, (*buffer)++;
1840 *buf = *buffer;
1841 }
1842 return 0;
1843 }
1844
1845 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
1846 int *valp,
1847 int write, void *data)
1848 {
1849 if (write) {
1850 *valp = *negp ? -*lvalp : *lvalp;
1851 } else {
1852 int val = *valp;
1853 if (val < 0) {
1854 *negp = true;
1855 *lvalp = (unsigned long)-val;
1856 } else {
1857 *negp = false;
1858 *lvalp = (unsigned long)val;
1859 }
1860 }
1861 return 0;
1862 }
1863
1864 static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
1865
1866 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
1867 int write, void __user *buffer,
1868 size_t *lenp, loff_t *ppos,
1869 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
1870 int write, void *data),
1871 void *data)
1872 {
1873 int *i, vleft, first = 1, err = 0;
1874 unsigned long page = 0;
1875 size_t left;
1876 char *kbuf;
1877
1878 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
1879 *lenp = 0;
1880 return 0;
1881 }
1882
1883 i = (int *) tbl_data;
1884 vleft = table->maxlen / sizeof(*i);
1885 left = *lenp;
1886
1887 if (!conv)
1888 conv = do_proc_dointvec_conv;
1889
1890 if (write) {
1891 if (left > PAGE_SIZE - 1)
1892 left = PAGE_SIZE - 1;
1893 page = __get_free_page(GFP_TEMPORARY);
1894 kbuf = (char *) page;
1895 if (!kbuf)
1896 return -ENOMEM;
1897 if (copy_from_user(kbuf, buffer, left)) {
1898 err = -EFAULT;
1899 goto free;
1900 }
1901 kbuf[left] = 0;
1902 }
1903
1904 for (; left && vleft--; i++, first=0) {
1905 unsigned long lval;
1906 bool neg;
1907
1908 if (write) {
1909 left -= proc_skip_spaces(&kbuf);
1910
1911 if (!left)
1912 break;
1913 err = proc_get_long(&kbuf, &left, &lval, &neg,
1914 proc_wspace_sep,
1915 sizeof(proc_wspace_sep), NULL);
1916 if (err)
1917 break;
1918 if (conv(&neg, &lval, i, 1, data)) {
1919 err = -EINVAL;
1920 break;
1921 }
1922 } else {
1923 if (conv(&neg, &lval, i, 0, data)) {
1924 err = -EINVAL;
1925 break;
1926 }
1927 if (!first)
1928 err = proc_put_char(&buffer, &left, '\t');
1929 if (err)
1930 break;
1931 err = proc_put_long(&buffer, &left, lval, neg);
1932 if (err)
1933 break;
1934 }
1935 }
1936
1937 if (!write && !first && left && !err)
1938 err = proc_put_char(&buffer, &left, '\n');
1939 if (write && !err && left)
1940 left -= proc_skip_spaces(&kbuf);
1941 free:
1942 if (write) {
1943 free_page(page);
1944 if (first)
1945 return err ? : -EINVAL;
1946 }
1947 *lenp -= left;
1948 *ppos += *lenp;
1949 return err;
1950 }
1951
1952 static int do_proc_dointvec(struct ctl_table *table, int write,
1953 void __user *buffer, size_t *lenp, loff_t *ppos,
1954 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
1955 int write, void *data),
1956 void *data)
1957 {
1958 return __do_proc_dointvec(table->data, table, write,
1959 buffer, lenp, ppos, conv, data);
1960 }
1961
1962 /**
1963 * proc_dointvec - read a vector of integers
1964 * @table: the sysctl table
1965 * @write: %TRUE if this is a write to the sysctl file
1966 * @buffer: the user buffer
1967 * @lenp: the size of the user buffer
1968 * @ppos: file position
1969 *
1970 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1971 * values from/to the user buffer, treated as an ASCII string.
1972 *
1973 * Returns 0 on success.
1974 */
1975 int proc_dointvec(struct ctl_table *table, int write,
1976 void __user *buffer, size_t *lenp, loff_t *ppos)
1977 {
1978 return do_proc_dointvec(table,write,buffer,lenp,ppos,
1979 NULL,NULL);
1980 }
1981
1982 /*
1983 * Taint values can only be increased
1984 * This means we can safely use a temporary.
1985 */
1986 static int proc_taint(struct ctl_table *table, int write,
1987 void __user *buffer, size_t *lenp, loff_t *ppos)
1988 {
1989 struct ctl_table t;
1990 unsigned long tmptaint = get_taint();
1991 int err;
1992
1993 if (write && !capable(CAP_SYS_ADMIN))
1994 return -EPERM;
1995
1996 t = *table;
1997 t.data = &tmptaint;
1998 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
1999 if (err < 0)
2000 return err;
2001
2002 if (write) {
2003 /*
2004 * Poor man's atomic or. Not worth adding a primitive
2005 * to everyone's atomic.h for this
2006 */
2007 int i;
2008 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2009 if ((tmptaint >> i) & 1)
2010 add_taint(i);
2011 }
2012 }
2013
2014 return err;
2015 }
2016
2017 #ifdef CONFIG_PRINTK
2018 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
2019 void __user *buffer, size_t *lenp, loff_t *ppos)
2020 {
2021 if (write && !capable(CAP_SYS_ADMIN))
2022 return -EPERM;
2023
2024 return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2025 }
2026 #endif
2027
2028 struct do_proc_dointvec_minmax_conv_param {
2029 int *min;
2030 int *max;
2031 };
2032
2033 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
2034 int *valp,
2035 int write, void *data)
2036 {
2037 struct do_proc_dointvec_minmax_conv_param *param = data;
2038 if (write) {
2039 int val = *negp ? -*lvalp : *lvalp;
2040 if ((param->min && *param->min > val) ||
2041 (param->max && *param->max < val))
2042 return -EINVAL;
2043 *valp = val;
2044 } else {
2045 int val = *valp;
2046 if (val < 0) {
2047 *negp = true;
2048 *lvalp = (unsigned long)-val;
2049 } else {
2050 *negp = false;
2051 *lvalp = (unsigned long)val;
2052 }
2053 }
2054 return 0;
2055 }
2056
2057 /**
2058 * proc_dointvec_minmax - read a vector of integers with min/max values
2059 * @table: the sysctl table
2060 * @write: %TRUE if this is a write to the sysctl file
2061 * @buffer: the user buffer
2062 * @lenp: the size of the user buffer
2063 * @ppos: file position
2064 *
2065 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2066 * values from/to the user buffer, treated as an ASCII string.
2067 *
2068 * This routine will ensure the values are within the range specified by
2069 * table->extra1 (min) and table->extra2 (max).
2070 *
2071 * Returns 0 on success.
2072 */
2073 int proc_dointvec_minmax(struct ctl_table *table, int write,
2074 void __user *buffer, size_t *lenp, loff_t *ppos)
2075 {
2076 struct do_proc_dointvec_minmax_conv_param param = {
2077 .min = (int *) table->extra1,
2078 .max = (int *) table->extra2,
2079 };
2080 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2081 do_proc_dointvec_minmax_conv, &param);
2082 }
2083
2084 static void validate_coredump_safety(void)
2085 {
2086 #ifdef CONFIG_COREDUMP
2087 if (suid_dumpable == SUID_DUMPABLE_SAFE &&
2088 core_pattern[0] != '/' && core_pattern[0] != '|') {
2089 printk(KERN_WARNING "Unsafe core_pattern used with "\
2090 "suid_dumpable=2. Pipe handler or fully qualified "\
2091 "core dump path required.\n");
2092 }
2093 #endif
2094 }
2095
2096 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
2097 void __user *buffer, size_t *lenp, loff_t *ppos)
2098 {
2099 int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2100 if (!error)
2101 validate_coredump_safety();
2102 return error;
2103 }
2104
2105 #ifdef CONFIG_COREDUMP
2106 static int proc_dostring_coredump(struct ctl_table *table, int write,
2107 void __user *buffer, size_t *lenp, loff_t *ppos)
2108 {
2109 int error = proc_dostring(table, write, buffer, lenp, ppos);
2110 if (!error)
2111 validate_coredump_safety();
2112 return error;
2113 }
2114 #endif
2115
2116 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2117 void __user *buffer,
2118 size_t *lenp, loff_t *ppos,
2119 unsigned long convmul,
2120 unsigned long convdiv)
2121 {
2122 unsigned long *i, *min, *max;
2123 int vleft, first = 1, err = 0;
2124 unsigned long page = 0;
2125 size_t left;
2126 char *kbuf;
2127
2128 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
2129 *lenp = 0;
2130 return 0;
2131 }
2132
2133 i = (unsigned long *) data;
2134 min = (unsigned long *) table->extra1;
2135 max = (unsigned long *) table->extra2;
2136 vleft = table->maxlen / sizeof(unsigned long);
2137 left = *lenp;
2138
2139 if (write) {
2140 if (left > PAGE_SIZE - 1)
2141 left = PAGE_SIZE - 1;
2142 page = __get_free_page(GFP_TEMPORARY);
2143 kbuf = (char *) page;
2144 if (!kbuf)
2145 return -ENOMEM;
2146 if (copy_from_user(kbuf, buffer, left)) {
2147 err = -EFAULT;
2148 goto free;
2149 }
2150 kbuf[left] = 0;
2151 }
2152
2153 for (; left && vleft--; i++, first = 0) {
2154 unsigned long val;
2155
2156 if (write) {
2157 bool neg;
2158
2159 left -= proc_skip_spaces(&kbuf);
2160
2161 err = proc_get_long(&kbuf, &left, &val, &neg,
2162 proc_wspace_sep,
2163 sizeof(proc_wspace_sep), NULL);
2164 if (err)
2165 break;
2166 if (neg)
2167 continue;
2168 if ((min && val < *min) || (max && val > *max))
2169 continue;
2170 *i = val;
2171 } else {
2172 val = convdiv * (*i) / convmul;
2173 if (!first)
2174 err = proc_put_char(&buffer, &left, '\t');
2175 err = proc_put_long(&buffer, &left, val, false);
2176 if (err)
2177 break;
2178 }
2179 }
2180
2181 if (!write && !first && left && !err)
2182 err = proc_put_char(&buffer, &left, '\n');
2183 if (write && !err)
2184 left -= proc_skip_spaces(&kbuf);
2185 free:
2186 if (write) {
2187 free_page(page);
2188 if (first)
2189 return err ? : -EINVAL;
2190 }
2191 *lenp -= left;
2192 *ppos += *lenp;
2193 return err;
2194 }
2195
2196 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2197 void __user *buffer,
2198 size_t *lenp, loff_t *ppos,
2199 unsigned long convmul,
2200 unsigned long convdiv)
2201 {
2202 return __do_proc_doulongvec_minmax(table->data, table, write,
2203 buffer, lenp, ppos, convmul, convdiv);
2204 }
2205
2206 /**
2207 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2208 * @table: the sysctl table
2209 * @write: %TRUE if this is a write to the sysctl file
2210 * @buffer: the user buffer
2211 * @lenp: the size of the user buffer
2212 * @ppos: file position
2213 *
2214 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2215 * values from/to the user buffer, treated as an ASCII string.
2216 *
2217 * This routine will ensure the values are within the range specified by
2218 * table->extra1 (min) and table->extra2 (max).
2219 *
2220 * Returns 0 on success.
2221 */
2222 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2223 void __user *buffer, size_t *lenp, loff_t *ppos)
2224 {
2225 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
2226 }
2227
2228 /**
2229 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2230 * @table: the sysctl table
2231 * @write: %TRUE if this is a write to the sysctl file
2232 * @buffer: the user buffer
2233 * @lenp: the size of the user buffer
2234 * @ppos: file position
2235 *
2236 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2237 * values from/to the user buffer, treated as an ASCII string. The values
2238 * are treated as milliseconds, and converted to jiffies when they are stored.
2239 *
2240 * This routine will ensure the values are within the range specified by
2241 * table->extra1 (min) and table->extra2 (max).
2242 *
2243 * Returns 0 on success.
2244 */
2245 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2246 void __user *buffer,
2247 size_t *lenp, loff_t *ppos)
2248 {
2249 return do_proc_doulongvec_minmax(table, write, buffer,
2250 lenp, ppos, HZ, 1000l);
2251 }
2252
2253
2254 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
2255 int *valp,
2256 int write, void *data)
2257 {
2258 if (write) {
2259 if (*lvalp > LONG_MAX / HZ)
2260 return 1;
2261 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2262 } else {
2263 int val = *valp;
2264 unsigned long lval;
2265 if (val < 0) {
2266 *negp = true;
2267 lval = (unsigned long)-val;
2268 } else {
2269 *negp = false;
2270 lval = (unsigned long)val;
2271 }
2272 *lvalp = lval / HZ;
2273 }
2274 return 0;
2275 }
2276
2277 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
2278 int *valp,
2279 int write, void *data)
2280 {
2281 if (write) {
2282 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2283 return 1;
2284 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2285 } else {
2286 int val = *valp;
2287 unsigned long lval;
2288 if (val < 0) {
2289 *negp = true;
2290 lval = (unsigned long)-val;
2291 } else {
2292 *negp = false;
2293 lval = (unsigned long)val;
2294 }
2295 *lvalp = jiffies_to_clock_t(lval);
2296 }
2297 return 0;
2298 }
2299
2300 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
2301 int *valp,
2302 int write, void *data)
2303 {
2304 if (write) {
2305 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2306 } else {
2307 int val = *valp;
2308 unsigned long lval;
2309 if (val < 0) {
2310 *negp = true;
2311 lval = (unsigned long)-val;
2312 } else {
2313 *negp = false;
2314 lval = (unsigned long)val;
2315 }
2316 *lvalp = jiffies_to_msecs(lval);
2317 }
2318 return 0;
2319 }
2320
2321 /**
2322 * proc_dointvec_jiffies - read a vector of integers as seconds
2323 * @table: the sysctl table
2324 * @write: %TRUE if this is a write to the sysctl file
2325 * @buffer: the user buffer
2326 * @lenp: the size of the user buffer
2327 * @ppos: file position
2328 *
2329 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2330 * values from/to the user buffer, treated as an ASCII string.
2331 * The values read are assumed to be in seconds, and are converted into
2332 * jiffies.
2333 *
2334 * Returns 0 on success.
2335 */
2336 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2337 void __user *buffer, size_t *lenp, loff_t *ppos)
2338 {
2339 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2340 do_proc_dointvec_jiffies_conv,NULL);
2341 }
2342
2343 /**
2344 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2345 * @table: the sysctl table
2346 * @write: %TRUE if this is a write to the sysctl file
2347 * @buffer: the user buffer
2348 * @lenp: the size of the user buffer
2349 * @ppos: pointer to the file position
2350 *
2351 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2352 * values from/to the user buffer, treated as an ASCII string.
2353 * The values read are assumed to be in 1/USER_HZ seconds, and
2354 * are converted into jiffies.
2355 *
2356 * Returns 0 on success.
2357 */
2358 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2359 void __user *buffer, size_t *lenp, loff_t *ppos)
2360 {
2361 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2362 do_proc_dointvec_userhz_jiffies_conv,NULL);
2363 }
2364
2365 /**
2366 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2367 * @table: the sysctl table
2368 * @write: %TRUE if this is a write to the sysctl file
2369 * @buffer: the user buffer
2370 * @lenp: the size of the user buffer
2371 * @ppos: file position
2372 * @ppos: the current position in the file
2373 *
2374 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2375 * values from/to the user buffer, treated as an ASCII string.
2376 * The values read are assumed to be in 1/1000 seconds, and
2377 * are converted into jiffies.
2378 *
2379 * Returns 0 on success.
2380 */
2381 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2382 void __user *buffer, size_t *lenp, loff_t *ppos)
2383 {
2384 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2385 do_proc_dointvec_ms_jiffies_conv, NULL);
2386 }
2387
2388 static int proc_do_cad_pid(struct ctl_table *table, int write,
2389 void __user *buffer, size_t *lenp, loff_t *ppos)
2390 {
2391 struct pid *new_pid;
2392 pid_t tmp;
2393 int r;
2394
2395 tmp = pid_vnr(cad_pid);
2396
2397 r = __do_proc_dointvec(&tmp, table, write, buffer,
2398 lenp, ppos, NULL, NULL);
2399 if (r || !write)
2400 return r;
2401
2402 new_pid = find_get_pid(tmp);
2403 if (!new_pid)
2404 return -ESRCH;
2405
2406 put_pid(xchg(&cad_pid, new_pid));
2407 return 0;
2408 }
2409
2410 /**
2411 * proc_do_large_bitmap - read/write from/to a large bitmap
2412 * @table: the sysctl table
2413 * @write: %TRUE if this is a write to the sysctl file
2414 * @buffer: the user buffer
2415 * @lenp: the size of the user buffer
2416 * @ppos: file position
2417 *
2418 * The bitmap is stored at table->data and the bitmap length (in bits)
2419 * in table->maxlen.
2420 *
2421 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2422 * large bitmaps may be represented in a compact manner. Writing into
2423 * the file will clear the bitmap then update it with the given input.
2424 *
2425 * Returns 0 on success.
2426 */
2427 int proc_do_large_bitmap(struct ctl_table *table, int write,
2428 void __user *buffer, size_t *lenp, loff_t *ppos)
2429 {
2430 int err = 0;
2431 bool first = 1;
2432 size_t left = *lenp;
2433 unsigned long bitmap_len = table->maxlen;
2434 unsigned long *bitmap = (unsigned long *) table->data;
2435 unsigned long *tmp_bitmap = NULL;
2436 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
2437
2438 if (!bitmap_len || !left || (*ppos && !write)) {
2439 *lenp = 0;
2440 return 0;
2441 }
2442
2443 if (write) {
2444 unsigned long page = 0;
2445 char *kbuf;
2446
2447 if (left > PAGE_SIZE - 1)
2448 left = PAGE_SIZE - 1;
2449
2450 page = __get_free_page(GFP_TEMPORARY);
2451 kbuf = (char *) page;
2452 if (!kbuf)
2453 return -ENOMEM;
2454 if (copy_from_user(kbuf, buffer, left)) {
2455 free_page(page);
2456 return -EFAULT;
2457 }
2458 kbuf[left] = 0;
2459
2460 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long),
2461 GFP_KERNEL);
2462 if (!tmp_bitmap) {
2463 free_page(page);
2464 return -ENOMEM;
2465 }
2466 proc_skip_char(&kbuf, &left, '\n');
2467 while (!err && left) {
2468 unsigned long val_a, val_b;
2469 bool neg;
2470
2471 err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a,
2472 sizeof(tr_a), &c);
2473 if (err)
2474 break;
2475 if (val_a >= bitmap_len || neg) {
2476 err = -EINVAL;
2477 break;
2478 }
2479
2480 val_b = val_a;
2481 if (left) {
2482 kbuf++;
2483 left--;
2484 }
2485
2486 if (c == '-') {
2487 err = proc_get_long(&kbuf, &left, &val_b,
2488 &neg, tr_b, sizeof(tr_b),
2489 &c);
2490 if (err)
2491 break;
2492 if (val_b >= bitmap_len || neg ||
2493 val_a > val_b) {
2494 err = -EINVAL;
2495 break;
2496 }
2497 if (left) {
2498 kbuf++;
2499 left--;
2500 }
2501 }
2502
2503 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
2504 first = 0;
2505 proc_skip_char(&kbuf, &left, '\n');
2506 }
2507 free_page(page);
2508 } else {
2509 unsigned long bit_a, bit_b = 0;
2510
2511 while (left) {
2512 bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
2513 if (bit_a >= bitmap_len)
2514 break;
2515 bit_b = find_next_zero_bit(bitmap, bitmap_len,
2516 bit_a + 1) - 1;
2517
2518 if (!first) {
2519 err = proc_put_char(&buffer, &left, ',');
2520 if (err)
2521 break;
2522 }
2523 err = proc_put_long(&buffer, &left, bit_a, false);
2524 if (err)
2525 break;
2526 if (bit_a != bit_b) {
2527 err = proc_put_char(&buffer, &left, '-');
2528 if (err)
2529 break;
2530 err = proc_put_long(&buffer, &left, bit_b, false);
2531 if (err)
2532 break;
2533 }
2534
2535 first = 0; bit_b++;
2536 }
2537 if (!err)
2538 err = proc_put_char(&buffer, &left, '\n');
2539 }
2540
2541 if (!err) {
2542 if (write) {
2543 if (*ppos)
2544 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
2545 else
2546 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
2547 }
2548 kfree(tmp_bitmap);
2549 *lenp -= left;
2550 *ppos += *lenp;
2551 return 0;
2552 } else {
2553 kfree(tmp_bitmap);
2554 return err;
2555 }
2556 }
2557
2558 #else /* CONFIG_PROC_SYSCTL */
2559
2560 int proc_dostring(struct ctl_table *table, int write,
2561 void __user *buffer, size_t *lenp, loff_t *ppos)
2562 {
2563 return -ENOSYS;
2564 }
2565
2566 int proc_dointvec(struct ctl_table *table, int write,
2567 void __user *buffer, size_t *lenp, loff_t *ppos)
2568 {
2569 return -ENOSYS;
2570 }
2571
2572 int proc_dointvec_minmax(struct ctl_table *table, int write,
2573 void __user *buffer, size_t *lenp, loff_t *ppos)
2574 {
2575 return -ENOSYS;
2576 }
2577
2578 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2579 void __user *buffer, size_t *lenp, loff_t *ppos)
2580 {
2581 return -ENOSYS;
2582 }
2583
2584 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2585 void __user *buffer, size_t *lenp, loff_t *ppos)
2586 {
2587 return -ENOSYS;
2588 }
2589
2590 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2591 void __user *buffer, size_t *lenp, loff_t *ppos)
2592 {
2593 return -ENOSYS;
2594 }
2595
2596 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2597 void __user *buffer, size_t *lenp, loff_t *ppos)
2598 {
2599 return -ENOSYS;
2600 }
2601
2602 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2603 void __user *buffer,
2604 size_t *lenp, loff_t *ppos)
2605 {
2606 return -ENOSYS;
2607 }
2608
2609
2610 #endif /* CONFIG_PROC_SYSCTL */
2611
2612 /*
2613 * No sense putting this after each symbol definition, twice,
2614 * exception granted :-)
2615 */
2616 EXPORT_SYMBOL(proc_dointvec);
2617 EXPORT_SYMBOL(proc_dointvec_jiffies);
2618 EXPORT_SYMBOL(proc_dointvec_minmax);
2619 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2620 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2621 EXPORT_SYMBOL(proc_dostring);
2622 EXPORT_SYMBOL(proc_doulongvec_minmax);
2623 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
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