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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 #include <linux/kexec.h>
66
67 #include <asm/uaccess.h>
68 #include <asm/processor.h>
69
70 #ifdef CONFIG_X86
71 #include <asm/nmi.h>
72 #include <asm/stacktrace.h>
73 #include <asm/io.h>
74 #endif
75 #ifdef CONFIG_SPARC
76 #include <asm/setup.h>
77 #endif
78 #ifdef CONFIG_BSD_PROCESS_ACCT
79 #include <linux/acct.h>
80 #endif
81 #ifdef CONFIG_RT_MUTEXES
82 #include <linux/rtmutex.h>
83 #endif
84 #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
85 #include <linux/lockdep.h>
86 #endif
87 #ifdef CONFIG_CHR_DEV_SG
88 #include <scsi/sg.h>
89 #endif
90
91 #ifdef CONFIG_LOCKUP_DETECTOR
92 #include <linux/nmi.h>
93 #endif
94
95
96 #if defined(CONFIG_SYSCTL)
97
98 /* External variables not in a header file. */
99 extern int max_threads;
100 extern int suid_dumpable;
101 #ifdef CONFIG_COREDUMP
102 extern int core_uses_pid;
103 extern char core_pattern[];
104 extern unsigned int core_pipe_limit;
105 #endif
106 extern int pid_max;
107 extern int pid_max_min, pid_max_max;
108 extern int percpu_pagelist_fraction;
109 extern int compat_log;
110 extern int latencytop_enabled;
111 extern int sysctl_nr_open_min, sysctl_nr_open_max;
112 #ifndef CONFIG_MMU
113 extern int sysctl_nr_trim_pages;
114 #endif
115
116 /* Constants used for minimum and maximum */
117 #ifdef CONFIG_LOCKUP_DETECTOR
118 static int sixty = 60;
119 #endif
120
121 static int __maybe_unused neg_one = -1;
122
123 static int zero;
124 static int __maybe_unused one = 1;
125 static int __maybe_unused two = 2;
126 static int __maybe_unused three = 3;
127 static unsigned long one_ul = 1;
128 static int one_hundred = 100;
129 #ifdef CONFIG_PRINTK
130 static int ten_thousand = 10000;
131 #endif
132
133 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
134 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
135
136 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
137 static int maxolduid = 65535;
138 static int minolduid;
139 static int min_percpu_pagelist_fract = 8;
140
141 static int ngroups_max = NGROUPS_MAX;
142 static const int cap_last_cap = CAP_LAST_CAP;
143
144 #ifdef CONFIG_INOTIFY_USER
145 #include <linux/inotify.h>
146 #endif
147 #ifdef CONFIG_SPARC
148 #endif
149
150 #ifdef CONFIG_SPARC64
151 extern int sysctl_tsb_ratio;
152 #endif
153
154 #ifdef __hppa__
155 extern int pwrsw_enabled;
156 #endif
157
158 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
159 extern int unaligned_enabled;
160 #endif
161
162 #ifdef CONFIG_IA64
163 extern int unaligned_dump_stack;
164 #endif
165
166 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
167 extern int no_unaligned_warning;
168 #endif
169
170 #ifdef CONFIG_PROC_SYSCTL
171 static int proc_do_cad_pid(struct ctl_table *table, int write,
172 void __user *buffer, size_t *lenp, loff_t *ppos);
173 static int proc_taint(struct ctl_table *table, int write,
174 void __user *buffer, size_t *lenp, loff_t *ppos);
175 #endif
176
177 #ifdef CONFIG_PRINTK
178 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
179 void __user *buffer, size_t *lenp, loff_t *ppos);
180 #endif
181
182 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
183 void __user *buffer, size_t *lenp, loff_t *ppos);
184 #ifdef CONFIG_COREDUMP
185 static int proc_dostring_coredump(struct ctl_table *table, int write,
186 void __user *buffer, size_t *lenp, loff_t *ppos);
187 #endif
188
189 #ifdef CONFIG_MAGIC_SYSRQ
190 /* Note: sysrq code uses it's own private copy */
191 static int __sysrq_enabled = CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE;
192
193 static int sysrq_sysctl_handler(ctl_table *table, int write,
194 void __user *buffer, size_t *lenp,
195 loff_t *ppos)
196 {
197 int error;
198
199 error = proc_dointvec(table, write, buffer, lenp, ppos);
200 if (error)
201 return error;
202
203 if (write)
204 sysrq_toggle_support(__sysrq_enabled);
205
206 return 0;
207 }
208
209 #endif
210
211 static struct ctl_table kern_table[];
212 static struct ctl_table vm_table[];
213 static struct ctl_table fs_table[];
214 static struct ctl_table debug_table[];
215 static struct ctl_table dev_table[];
216 extern struct ctl_table random_table[];
217 #ifdef CONFIG_EPOLL
218 extern struct ctl_table epoll_table[];
219 #endif
220
221 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
222 int sysctl_legacy_va_layout;
223 #endif
224
225 /* The default sysctl tables: */
226
227 static struct ctl_table sysctl_base_table[] = {
228 {
229 .procname = "kernel",
230 .mode = 0555,
231 .child = kern_table,
232 },
233 {
234 .procname = "vm",
235 .mode = 0555,
236 .child = vm_table,
237 },
238 {
239 .procname = "fs",
240 .mode = 0555,
241 .child = fs_table,
242 },
243 {
244 .procname = "debug",
245 .mode = 0555,
246 .child = debug_table,
247 },
248 {
249 .procname = "dev",
250 .mode = 0555,
251 .child = dev_table,
252 },
253 { }
254 };
255
256 #ifdef CONFIG_SCHED_DEBUG
257 static int min_sched_granularity_ns = 100000; /* 100 usecs */
258 static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */
259 static int min_wakeup_granularity_ns; /* 0 usecs */
260 static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */
261 #ifdef CONFIG_SMP
262 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
263 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
264 #endif /* CONFIG_SMP */
265 #endif /* CONFIG_SCHED_DEBUG */
266
267 #ifdef CONFIG_COMPACTION
268 static int min_extfrag_threshold;
269 static int max_extfrag_threshold = 1000;
270 #endif
271
272 static struct ctl_table kern_table[] = {
273 {
274 .procname = "sched_child_runs_first",
275 .data = &sysctl_sched_child_runs_first,
276 .maxlen = sizeof(unsigned int),
277 .mode = 0644,
278 .proc_handler = proc_dointvec,
279 },
280 #ifdef CONFIG_SCHED_DEBUG
281 {
282 .procname = "sched_min_granularity_ns",
283 .data = &sysctl_sched_min_granularity,
284 .maxlen = sizeof(unsigned int),
285 .mode = 0644,
286 .proc_handler = sched_proc_update_handler,
287 .extra1 = &min_sched_granularity_ns,
288 .extra2 = &max_sched_granularity_ns,
289 },
290 {
291 .procname = "sched_latency_ns",
292 .data = &sysctl_sched_latency,
293 .maxlen = sizeof(unsigned int),
294 .mode = 0644,
295 .proc_handler = sched_proc_update_handler,
296 .extra1 = &min_sched_granularity_ns,
297 .extra2 = &max_sched_granularity_ns,
298 },
299 {
300 .procname = "sched_wakeup_granularity_ns",
301 .data = &sysctl_sched_wakeup_granularity,
302 .maxlen = sizeof(unsigned int),
303 .mode = 0644,
304 .proc_handler = sched_proc_update_handler,
305 .extra1 = &min_wakeup_granularity_ns,
306 .extra2 = &max_wakeup_granularity_ns,
307 },
308 #ifdef CONFIG_SMP
309 {
310 .procname = "sched_tunable_scaling",
311 .data = &sysctl_sched_tunable_scaling,
312 .maxlen = sizeof(enum sched_tunable_scaling),
313 .mode = 0644,
314 .proc_handler = sched_proc_update_handler,
315 .extra1 = &min_sched_tunable_scaling,
316 .extra2 = &max_sched_tunable_scaling,
317 },
318 {
319 .procname = "sched_migration_cost_ns",
320 .data = &sysctl_sched_migration_cost,
321 .maxlen = sizeof(unsigned int),
322 .mode = 0644,
323 .proc_handler = proc_dointvec,
324 },
325 {
326 .procname = "sched_nr_migrate",
327 .data = &sysctl_sched_nr_migrate,
328 .maxlen = sizeof(unsigned int),
329 .mode = 0644,
330 .proc_handler = proc_dointvec,
331 },
332 {
333 .procname = "sched_time_avg_ms",
334 .data = &sysctl_sched_time_avg,
335 .maxlen = sizeof(unsigned int),
336 .mode = 0644,
337 .proc_handler = proc_dointvec,
338 },
339 {
340 .procname = "sched_shares_window_ns",
341 .data = &sysctl_sched_shares_window,
342 .maxlen = sizeof(unsigned int),
343 .mode = 0644,
344 .proc_handler = proc_dointvec,
345 },
346 {
347 .procname = "timer_migration",
348 .data = &sysctl_timer_migration,
349 .maxlen = sizeof(unsigned int),
350 .mode = 0644,
351 .proc_handler = proc_dointvec_minmax,
352 .extra1 = &zero,
353 .extra2 = &one,
354 },
355 #endif /* CONFIG_SMP */
356 #ifdef CONFIG_NUMA_BALANCING
357 {
358 .procname = "numa_balancing_scan_delay_ms",
359 .data = &sysctl_numa_balancing_scan_delay,
360 .maxlen = sizeof(unsigned int),
361 .mode = 0644,
362 .proc_handler = proc_dointvec,
363 },
364 {
365 .procname = "numa_balancing_scan_period_min_ms",
366 .data = &sysctl_numa_balancing_scan_period_min,
367 .maxlen = sizeof(unsigned int),
368 .mode = 0644,
369 .proc_handler = proc_dointvec,
370 },
371 {
372 .procname = "numa_balancing_scan_period_max_ms",
373 .data = &sysctl_numa_balancing_scan_period_max,
374 .maxlen = sizeof(unsigned int),
375 .mode = 0644,
376 .proc_handler = proc_dointvec,
377 },
378 {
379 .procname = "numa_balancing_scan_size_mb",
380 .data = &sysctl_numa_balancing_scan_size,
381 .maxlen = sizeof(unsigned int),
382 .mode = 0644,
383 .proc_handler = proc_dointvec,
384 },
385 {
386 .procname = "numa_balancing",
387 .data = NULL, /* filled in by handler */
388 .maxlen = sizeof(unsigned int),
389 .mode = 0644,
390 .proc_handler = sysctl_numa_balancing,
391 .extra1 = &zero,
392 .extra2 = &one,
393 },
394 #endif /* CONFIG_NUMA_BALANCING */
395 #endif /* CONFIG_SCHED_DEBUG */
396 {
397 .procname = "sched_rt_period_us",
398 .data = &sysctl_sched_rt_period,
399 .maxlen = sizeof(unsigned int),
400 .mode = 0644,
401 .proc_handler = sched_rt_handler,
402 },
403 {
404 .procname = "sched_rt_runtime_us",
405 .data = &sysctl_sched_rt_runtime,
406 .maxlen = sizeof(int),
407 .mode = 0644,
408 .proc_handler = sched_rt_handler,
409 },
410 {
411 .procname = "sched_rr_timeslice_ms",
412 .data = &sched_rr_timeslice,
413 .maxlen = sizeof(int),
414 .mode = 0644,
415 .proc_handler = sched_rr_handler,
416 },
417 #ifdef CONFIG_SCHED_AUTOGROUP
418 {
419 .procname = "sched_autogroup_enabled",
420 .data = &sysctl_sched_autogroup_enabled,
421 .maxlen = sizeof(unsigned int),
422 .mode = 0644,
423 .proc_handler = proc_dointvec_minmax,
424 .extra1 = &zero,
425 .extra2 = &one,
426 },
427 #endif
428 #ifdef CONFIG_CFS_BANDWIDTH
429 {
430 .procname = "sched_cfs_bandwidth_slice_us",
431 .data = &sysctl_sched_cfs_bandwidth_slice,
432 .maxlen = sizeof(unsigned int),
433 .mode = 0644,
434 .proc_handler = proc_dointvec_minmax,
435 .extra1 = &one,
436 },
437 #endif
438 #ifdef CONFIG_PROVE_LOCKING
439 {
440 .procname = "prove_locking",
441 .data = &prove_locking,
442 .maxlen = sizeof(int),
443 .mode = 0644,
444 .proc_handler = proc_dointvec,
445 },
446 #endif
447 #ifdef CONFIG_LOCK_STAT
448 {
449 .procname = "lock_stat",
450 .data = &lock_stat,
451 .maxlen = sizeof(int),
452 .mode = 0644,
453 .proc_handler = proc_dointvec,
454 },
455 #endif
456 {
457 .procname = "panic",
458 .data = &panic_timeout,
459 .maxlen = sizeof(int),
460 .mode = 0644,
461 .proc_handler = proc_dointvec,
462 },
463 #ifdef CONFIG_COREDUMP
464 {
465 .procname = "core_uses_pid",
466 .data = &core_uses_pid,
467 .maxlen = sizeof(int),
468 .mode = 0644,
469 .proc_handler = proc_dointvec,
470 },
471 {
472 .procname = "core_pattern",
473 .data = core_pattern,
474 .maxlen = CORENAME_MAX_SIZE,
475 .mode = 0644,
476 .proc_handler = proc_dostring_coredump,
477 },
478 {
479 .procname = "core_pipe_limit",
480 .data = &core_pipe_limit,
481 .maxlen = sizeof(unsigned int),
482 .mode = 0644,
483 .proc_handler = proc_dointvec,
484 },
485 #endif
486 #ifdef CONFIG_PROC_SYSCTL
487 {
488 .procname = "tainted",
489 .maxlen = sizeof(long),
490 .mode = 0644,
491 .proc_handler = proc_taint,
492 },
493 #endif
494 #ifdef CONFIG_LATENCYTOP
495 {
496 .procname = "latencytop",
497 .data = &latencytop_enabled,
498 .maxlen = sizeof(int),
499 .mode = 0644,
500 .proc_handler = proc_dointvec,
501 },
502 #endif
503 #ifdef CONFIG_BLK_DEV_INITRD
504 {
505 .procname = "real-root-dev",
506 .data = &real_root_dev,
507 .maxlen = sizeof(int),
508 .mode = 0644,
509 .proc_handler = proc_dointvec,
510 },
511 #endif
512 {
513 .procname = "print-fatal-signals",
514 .data = &print_fatal_signals,
515 .maxlen = sizeof(int),
516 .mode = 0644,
517 .proc_handler = proc_dointvec,
518 },
519 #ifdef CONFIG_SPARC
520 {
521 .procname = "reboot-cmd",
522 .data = reboot_command,
523 .maxlen = 256,
524 .mode = 0644,
525 .proc_handler = proc_dostring,
526 },
527 {
528 .procname = "stop-a",
529 .data = &stop_a_enabled,
530 .maxlen = sizeof (int),
531 .mode = 0644,
532 .proc_handler = proc_dointvec,
533 },
534 {
535 .procname = "scons-poweroff",
536 .data = &scons_pwroff,
537 .maxlen = sizeof (int),
538 .mode = 0644,
539 .proc_handler = proc_dointvec,
540 },
541 #endif
542 #ifdef CONFIG_SPARC64
543 {
544 .procname = "tsb-ratio",
545 .data = &sysctl_tsb_ratio,
546 .maxlen = sizeof (int),
547 .mode = 0644,
548 .proc_handler = proc_dointvec,
549 },
550 #endif
551 #ifdef __hppa__
552 {
553 .procname = "soft-power",
554 .data = &pwrsw_enabled,
555 .maxlen = sizeof (int),
556 .mode = 0644,
557 .proc_handler = proc_dointvec,
558 },
559 #endif
560 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
561 {
562 .procname = "unaligned-trap",
563 .data = &unaligned_enabled,
564 .maxlen = sizeof (int),
565 .mode = 0644,
566 .proc_handler = proc_dointvec,
567 },
568 #endif
569 {
570 .procname = "ctrl-alt-del",
571 .data = &C_A_D,
572 .maxlen = sizeof(int),
573 .mode = 0644,
574 .proc_handler = proc_dointvec,
575 },
576 #ifdef CONFIG_FUNCTION_TRACER
577 {
578 .procname = "ftrace_enabled",
579 .data = &ftrace_enabled,
580 .maxlen = sizeof(int),
581 .mode = 0644,
582 .proc_handler = ftrace_enable_sysctl,
583 },
584 #endif
585 #ifdef CONFIG_STACK_TRACER
586 {
587 .procname = "stack_tracer_enabled",
588 .data = &stack_tracer_enabled,
589 .maxlen = sizeof(int),
590 .mode = 0644,
591 .proc_handler = stack_trace_sysctl,
592 },
593 #endif
594 #ifdef CONFIG_TRACING
595 {
596 .procname = "ftrace_dump_on_oops",
597 .data = &ftrace_dump_on_oops,
598 .maxlen = sizeof(int),
599 .mode = 0644,
600 .proc_handler = proc_dointvec,
601 },
602 {
603 .procname = "traceoff_on_warning",
604 .data = &__disable_trace_on_warning,
605 .maxlen = sizeof(__disable_trace_on_warning),
606 .mode = 0644,
607 .proc_handler = proc_dointvec,
608 },
609 #endif
610 #ifdef CONFIG_KEXEC
611 {
612 .procname = "kexec_load_disabled",
613 .data = &kexec_load_disabled,
614 .maxlen = sizeof(int),
615 .mode = 0644,
616 /* only handle a transition from default "0" to "1" */
617 .proc_handler = proc_dointvec_minmax,
618 .extra1 = &one,
619 .extra2 = &one,
620 },
621 #endif
622 #ifdef CONFIG_MODULES
623 {
624 .procname = "modprobe",
625 .data = &modprobe_path,
626 .maxlen = KMOD_PATH_LEN,
627 .mode = 0644,
628 .proc_handler = proc_dostring,
629 },
630 {
631 .procname = "modules_disabled",
632 .data = &modules_disabled,
633 .maxlen = sizeof(int),
634 .mode = 0644,
635 /* only handle a transition from default "0" to "1" */
636 .proc_handler = proc_dointvec_minmax,
637 .extra1 = &one,
638 .extra2 = &one,
639 },
640 #endif
641
642 {
643 .procname = "hotplug",
644 .data = &uevent_helper,
645 .maxlen = UEVENT_HELPER_PATH_LEN,
646 .mode = 0644,
647 .proc_handler = proc_dostring,
648 },
649
650 #ifdef CONFIG_CHR_DEV_SG
651 {
652 .procname = "sg-big-buff",
653 .data = &sg_big_buff,
654 .maxlen = sizeof (int),
655 .mode = 0444,
656 .proc_handler = proc_dointvec,
657 },
658 #endif
659 #ifdef CONFIG_BSD_PROCESS_ACCT
660 {
661 .procname = "acct",
662 .data = &acct_parm,
663 .maxlen = 3*sizeof(int),
664 .mode = 0644,
665 .proc_handler = proc_dointvec,
666 },
667 #endif
668 #ifdef CONFIG_MAGIC_SYSRQ
669 {
670 .procname = "sysrq",
671 .data = &__sysrq_enabled,
672 .maxlen = sizeof (int),
673 .mode = 0644,
674 .proc_handler = sysrq_sysctl_handler,
675 },
676 #endif
677 #ifdef CONFIG_PROC_SYSCTL
678 {
679 .procname = "cad_pid",
680 .data = NULL,
681 .maxlen = sizeof (int),
682 .mode = 0600,
683 .proc_handler = proc_do_cad_pid,
684 },
685 #endif
686 {
687 .procname = "threads-max",
688 .data = &max_threads,
689 .maxlen = sizeof(int),
690 .mode = 0644,
691 .proc_handler = proc_dointvec,
692 },
693 {
694 .procname = "random",
695 .mode = 0555,
696 .child = random_table,
697 },
698 {
699 .procname = "usermodehelper",
700 .mode = 0555,
701 .child = usermodehelper_table,
702 },
703 {
704 .procname = "overflowuid",
705 .data = &overflowuid,
706 .maxlen = sizeof(int),
707 .mode = 0644,
708 .proc_handler = proc_dointvec_minmax,
709 .extra1 = &minolduid,
710 .extra2 = &maxolduid,
711 },
712 {
713 .procname = "overflowgid",
714 .data = &overflowgid,
715 .maxlen = sizeof(int),
716 .mode = 0644,
717 .proc_handler = proc_dointvec_minmax,
718 .extra1 = &minolduid,
719 .extra2 = &maxolduid,
720 },
721 #ifdef CONFIG_S390
722 #ifdef CONFIG_MATHEMU
723 {
724 .procname = "ieee_emulation_warnings",
725 .data = &sysctl_ieee_emulation_warnings,
726 .maxlen = sizeof(int),
727 .mode = 0644,
728 .proc_handler = proc_dointvec,
729 },
730 #endif
731 {
732 .procname = "userprocess_debug",
733 .data = &show_unhandled_signals,
734 .maxlen = sizeof(int),
735 .mode = 0644,
736 .proc_handler = proc_dointvec,
737 },
738 #endif
739 {
740 .procname = "pid_max",
741 .data = &pid_max,
742 .maxlen = sizeof (int),
743 .mode = 0644,
744 .proc_handler = proc_dointvec_minmax,
745 .extra1 = &pid_max_min,
746 .extra2 = &pid_max_max,
747 },
748 {
749 .procname = "panic_on_oops",
750 .data = &panic_on_oops,
751 .maxlen = sizeof(int),
752 .mode = 0644,
753 .proc_handler = proc_dointvec,
754 },
755 #if defined CONFIG_PRINTK
756 {
757 .procname = "printk",
758 .data = &console_loglevel,
759 .maxlen = 4*sizeof(int),
760 .mode = 0644,
761 .proc_handler = proc_dointvec,
762 },
763 {
764 .procname = "printk_ratelimit",
765 .data = &printk_ratelimit_state.interval,
766 .maxlen = sizeof(int),
767 .mode = 0644,
768 .proc_handler = proc_dointvec_jiffies,
769 },
770 {
771 .procname = "printk_ratelimit_burst",
772 .data = &printk_ratelimit_state.burst,
773 .maxlen = sizeof(int),
774 .mode = 0644,
775 .proc_handler = proc_dointvec,
776 },
777 {
778 .procname = "printk_delay",
779 .data = &printk_delay_msec,
780 .maxlen = sizeof(int),
781 .mode = 0644,
782 .proc_handler = proc_dointvec_minmax,
783 .extra1 = &zero,
784 .extra2 = &ten_thousand,
785 },
786 {
787 .procname = "dmesg_restrict",
788 .data = &dmesg_restrict,
789 .maxlen = sizeof(int),
790 .mode = 0644,
791 .proc_handler = proc_dointvec_minmax_sysadmin,
792 .extra1 = &zero,
793 .extra2 = &one,
794 },
795 {
796 .procname = "kptr_restrict",
797 .data = &kptr_restrict,
798 .maxlen = sizeof(int),
799 .mode = 0644,
800 .proc_handler = proc_dointvec_minmax_sysadmin,
801 .extra1 = &zero,
802 .extra2 = &two,
803 },
804 #endif
805 {
806 .procname = "ngroups_max",
807 .data = &ngroups_max,
808 .maxlen = sizeof (int),
809 .mode = 0444,
810 .proc_handler = proc_dointvec,
811 },
812 {
813 .procname = "cap_last_cap",
814 .data = (void *)&cap_last_cap,
815 .maxlen = sizeof(int),
816 .mode = 0444,
817 .proc_handler = proc_dointvec,
818 },
819 #if defined(CONFIG_LOCKUP_DETECTOR)
820 {
821 .procname = "watchdog",
822 .data = &watchdog_user_enabled,
823 .maxlen = sizeof (int),
824 .mode = 0644,
825 .proc_handler = proc_dowatchdog,
826 .extra1 = &zero,
827 .extra2 = &one,
828 },
829 {
830 .procname = "watchdog_thresh",
831 .data = &watchdog_thresh,
832 .maxlen = sizeof(int),
833 .mode = 0644,
834 .proc_handler = proc_dowatchdog,
835 .extra1 = &zero,
836 .extra2 = &sixty,
837 },
838 {
839 .procname = "softlockup_panic",
840 .data = &softlockup_panic,
841 .maxlen = sizeof(int),
842 .mode = 0644,
843 .proc_handler = proc_dointvec_minmax,
844 .extra1 = &zero,
845 .extra2 = &one,
846 },
847 {
848 .procname = "nmi_watchdog",
849 .data = &watchdog_user_enabled,
850 .maxlen = sizeof (int),
851 .mode = 0644,
852 .proc_handler = proc_dowatchdog,
853 .extra1 = &zero,
854 .extra2 = &one,
855 },
856 #endif
857 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
858 {
859 .procname = "unknown_nmi_panic",
860 .data = &unknown_nmi_panic,
861 .maxlen = sizeof (int),
862 .mode = 0644,
863 .proc_handler = proc_dointvec,
864 },
865 #endif
866 #if defined(CONFIG_X86)
867 {
868 .procname = "panic_on_unrecovered_nmi",
869 .data = &panic_on_unrecovered_nmi,
870 .maxlen = sizeof(int),
871 .mode = 0644,
872 .proc_handler = proc_dointvec,
873 },
874 {
875 .procname = "panic_on_io_nmi",
876 .data = &panic_on_io_nmi,
877 .maxlen = sizeof(int),
878 .mode = 0644,
879 .proc_handler = proc_dointvec,
880 },
881 #ifdef CONFIG_DEBUG_STACKOVERFLOW
882 {
883 .procname = "panic_on_stackoverflow",
884 .data = &sysctl_panic_on_stackoverflow,
885 .maxlen = sizeof(int),
886 .mode = 0644,
887 .proc_handler = proc_dointvec,
888 },
889 #endif
890 {
891 .procname = "bootloader_type",
892 .data = &bootloader_type,
893 .maxlen = sizeof (int),
894 .mode = 0444,
895 .proc_handler = proc_dointvec,
896 },
897 {
898 .procname = "bootloader_version",
899 .data = &bootloader_version,
900 .maxlen = sizeof (int),
901 .mode = 0444,
902 .proc_handler = proc_dointvec,
903 },
904 {
905 .procname = "kstack_depth_to_print",
906 .data = &kstack_depth_to_print,
907 .maxlen = sizeof(int),
908 .mode = 0644,
909 .proc_handler = proc_dointvec,
910 },
911 {
912 .procname = "io_delay_type",
913 .data = &io_delay_type,
914 .maxlen = sizeof(int),
915 .mode = 0644,
916 .proc_handler = proc_dointvec,
917 },
918 #endif
919 #if defined(CONFIG_MMU)
920 {
921 .procname = "randomize_va_space",
922 .data = &randomize_va_space,
923 .maxlen = sizeof(int),
924 .mode = 0644,
925 .proc_handler = proc_dointvec,
926 },
927 #endif
928 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
929 {
930 .procname = "spin_retry",
931 .data = &spin_retry,
932 .maxlen = sizeof (int),
933 .mode = 0644,
934 .proc_handler = proc_dointvec,
935 },
936 #endif
937 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
938 {
939 .procname = "acpi_video_flags",
940 .data = &acpi_realmode_flags,
941 .maxlen = sizeof (unsigned long),
942 .mode = 0644,
943 .proc_handler = proc_doulongvec_minmax,
944 },
945 #endif
946 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
947 {
948 .procname = "ignore-unaligned-usertrap",
949 .data = &no_unaligned_warning,
950 .maxlen = sizeof (int),
951 .mode = 0644,
952 .proc_handler = proc_dointvec,
953 },
954 #endif
955 #ifdef CONFIG_IA64
956 {
957 .procname = "unaligned-dump-stack",
958 .data = &unaligned_dump_stack,
959 .maxlen = sizeof (int),
960 .mode = 0644,
961 .proc_handler = proc_dointvec,
962 },
963 #endif
964 #ifdef CONFIG_DETECT_HUNG_TASK
965 {
966 .procname = "hung_task_panic",
967 .data = &sysctl_hung_task_panic,
968 .maxlen = sizeof(int),
969 .mode = 0644,
970 .proc_handler = proc_dointvec_minmax,
971 .extra1 = &zero,
972 .extra2 = &one,
973 },
974 {
975 .procname = "hung_task_check_count",
976 .data = &sysctl_hung_task_check_count,
977 .maxlen = sizeof(int),
978 .mode = 0644,
979 .proc_handler = proc_dointvec_minmax,
980 .extra1 = &zero,
981 },
982 {
983 .procname = "hung_task_timeout_secs",
984 .data = &sysctl_hung_task_timeout_secs,
985 .maxlen = sizeof(unsigned long),
986 .mode = 0644,
987 .proc_handler = proc_dohung_task_timeout_secs,
988 },
989 {
990 .procname = "hung_task_warnings",
991 .data = &sysctl_hung_task_warnings,
992 .maxlen = sizeof(int),
993 .mode = 0644,
994 .proc_handler = proc_dointvec_minmax,
995 .extra1 = &neg_one,
996 },
997 #endif
998 #ifdef CONFIG_COMPAT
999 {
1000 .procname = "compat-log",
1001 .data = &compat_log,
1002 .maxlen = sizeof (int),
1003 .mode = 0644,
1004 .proc_handler = proc_dointvec,
1005 },
1006 #endif
1007 #ifdef CONFIG_RT_MUTEXES
1008 {
1009 .procname = "max_lock_depth",
1010 .data = &max_lock_depth,
1011 .maxlen = sizeof(int),
1012 .mode = 0644,
1013 .proc_handler = proc_dointvec,
1014 },
1015 #endif
1016 {
1017 .procname = "poweroff_cmd",
1018 .data = &poweroff_cmd,
1019 .maxlen = POWEROFF_CMD_PATH_LEN,
1020 .mode = 0644,
1021 .proc_handler = proc_dostring,
1022 },
1023 #ifdef CONFIG_KEYS
1024 {
1025 .procname = "keys",
1026 .mode = 0555,
1027 .child = key_sysctls,
1028 },
1029 #endif
1030 #ifdef CONFIG_RCU_TORTURE_TEST
1031 {
1032 .procname = "rcutorture_runnable",
1033 .data = &rcutorture_runnable,
1034 .maxlen = sizeof(int),
1035 .mode = 0644,
1036 .proc_handler = proc_dointvec,
1037 },
1038 #endif
1039 #ifdef CONFIG_PERF_EVENTS
1040 /*
1041 * User-space scripts rely on the existence of this file
1042 * as a feature check for perf_events being enabled.
1043 *
1044 * So it's an ABI, do not remove!
1045 */
1046 {
1047 .procname = "perf_event_paranoid",
1048 .data = &sysctl_perf_event_paranoid,
1049 .maxlen = sizeof(sysctl_perf_event_paranoid),
1050 .mode = 0644,
1051 .proc_handler = proc_dointvec,
1052 },
1053 {
1054 .procname = "perf_event_mlock_kb",
1055 .data = &sysctl_perf_event_mlock,
1056 .maxlen = sizeof(sysctl_perf_event_mlock),
1057 .mode = 0644,
1058 .proc_handler = proc_dointvec,
1059 },
1060 {
1061 .procname = "perf_event_max_sample_rate",
1062 .data = &sysctl_perf_event_sample_rate,
1063 .maxlen = sizeof(sysctl_perf_event_sample_rate),
1064 .mode = 0644,
1065 .proc_handler = perf_proc_update_handler,
1066 .extra1 = &one,
1067 },
1068 {
1069 .procname = "perf_cpu_time_max_percent",
1070 .data = &sysctl_perf_cpu_time_max_percent,
1071 .maxlen = sizeof(sysctl_perf_cpu_time_max_percent),
1072 .mode = 0644,
1073 .proc_handler = perf_cpu_time_max_percent_handler,
1074 .extra1 = &zero,
1075 .extra2 = &one_hundred,
1076 },
1077 #endif
1078 #ifdef CONFIG_KMEMCHECK
1079 {
1080 .procname = "kmemcheck",
1081 .data = &kmemcheck_enabled,
1082 .maxlen = sizeof(int),
1083 .mode = 0644,
1084 .proc_handler = proc_dointvec,
1085 },
1086 #endif
1087 { }
1088 };
1089
1090 static struct ctl_table vm_table[] = {
1091 {
1092 .procname = "overcommit_memory",
1093 .data = &sysctl_overcommit_memory,
1094 .maxlen = sizeof(sysctl_overcommit_memory),
1095 .mode = 0644,
1096 .proc_handler = proc_dointvec_minmax,
1097 .extra1 = &zero,
1098 .extra2 = &two,
1099 },
1100 {
1101 .procname = "panic_on_oom",
1102 .data = &sysctl_panic_on_oom,
1103 .maxlen = sizeof(sysctl_panic_on_oom),
1104 .mode = 0644,
1105 .proc_handler = proc_dointvec_minmax,
1106 .extra1 = &zero,
1107 .extra2 = &two,
1108 },
1109 {
1110 .procname = "oom_kill_allocating_task",
1111 .data = &sysctl_oom_kill_allocating_task,
1112 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
1113 .mode = 0644,
1114 .proc_handler = proc_dointvec,
1115 },
1116 {
1117 .procname = "oom_dump_tasks",
1118 .data = &sysctl_oom_dump_tasks,
1119 .maxlen = sizeof(sysctl_oom_dump_tasks),
1120 .mode = 0644,
1121 .proc_handler = proc_dointvec,
1122 },
1123 {
1124 .procname = "overcommit_ratio",
1125 .data = &sysctl_overcommit_ratio,
1126 .maxlen = sizeof(sysctl_overcommit_ratio),
1127 .mode = 0644,
1128 .proc_handler = overcommit_ratio_handler,
1129 },
1130 {
1131 .procname = "overcommit_kbytes",
1132 .data = &sysctl_overcommit_kbytes,
1133 .maxlen = sizeof(sysctl_overcommit_kbytes),
1134 .mode = 0644,
1135 .proc_handler = overcommit_kbytes_handler,
1136 },
1137 {
1138 .procname = "page-cluster",
1139 .data = &page_cluster,
1140 .maxlen = sizeof(int),
1141 .mode = 0644,
1142 .proc_handler = proc_dointvec_minmax,
1143 .extra1 = &zero,
1144 },
1145 {
1146 .procname = "dirty_background_ratio",
1147 .data = &dirty_background_ratio,
1148 .maxlen = sizeof(dirty_background_ratio),
1149 .mode = 0644,
1150 .proc_handler = dirty_background_ratio_handler,
1151 .extra1 = &zero,
1152 .extra2 = &one_hundred,
1153 },
1154 {
1155 .procname = "dirty_background_bytes",
1156 .data = &dirty_background_bytes,
1157 .maxlen = sizeof(dirty_background_bytes),
1158 .mode = 0644,
1159 .proc_handler = dirty_background_bytes_handler,
1160 .extra1 = &one_ul,
1161 },
1162 {
1163 .procname = "dirty_ratio",
1164 .data = &vm_dirty_ratio,
1165 .maxlen = sizeof(vm_dirty_ratio),
1166 .mode = 0644,
1167 .proc_handler = dirty_ratio_handler,
1168 .extra1 = &zero,
1169 .extra2 = &one_hundred,
1170 },
1171 {
1172 .procname = "dirty_bytes",
1173 .data = &vm_dirty_bytes,
1174 .maxlen = sizeof(vm_dirty_bytes),
1175 .mode = 0644,
1176 .proc_handler = dirty_bytes_handler,
1177 .extra1 = &dirty_bytes_min,
1178 },
1179 {
1180 .procname = "dirty_writeback_centisecs",
1181 .data = &dirty_writeback_interval,
1182 .maxlen = sizeof(dirty_writeback_interval),
1183 .mode = 0644,
1184 .proc_handler = dirty_writeback_centisecs_handler,
1185 },
1186 {
1187 .procname = "dirty_expire_centisecs",
1188 .data = &dirty_expire_interval,
1189 .maxlen = sizeof(dirty_expire_interval),
1190 .mode = 0644,
1191 .proc_handler = proc_dointvec_minmax,
1192 .extra1 = &zero,
1193 },
1194 {
1195 .procname = "nr_pdflush_threads",
1196 .mode = 0444 /* read-only */,
1197 .proc_handler = pdflush_proc_obsolete,
1198 },
1199 {
1200 .procname = "swappiness",
1201 .data = &vm_swappiness,
1202 .maxlen = sizeof(vm_swappiness),
1203 .mode = 0644,
1204 .proc_handler = proc_dointvec_minmax,
1205 .extra1 = &zero,
1206 .extra2 = &one_hundred,
1207 },
1208 #ifdef CONFIG_HUGETLB_PAGE
1209 {
1210 .procname = "nr_hugepages",
1211 .data = NULL,
1212 .maxlen = sizeof(unsigned long),
1213 .mode = 0644,
1214 .proc_handler = hugetlb_sysctl_handler,
1215 .extra1 = (void *)&hugetlb_zero,
1216 .extra2 = (void *)&hugetlb_infinity,
1217 },
1218 #ifdef CONFIG_NUMA
1219 {
1220 .procname = "nr_hugepages_mempolicy",
1221 .data = NULL,
1222 .maxlen = sizeof(unsigned long),
1223 .mode = 0644,
1224 .proc_handler = &hugetlb_mempolicy_sysctl_handler,
1225 .extra1 = (void *)&hugetlb_zero,
1226 .extra2 = (void *)&hugetlb_infinity,
1227 },
1228 #endif
1229 {
1230 .procname = "hugetlb_shm_group",
1231 .data = &sysctl_hugetlb_shm_group,
1232 .maxlen = sizeof(gid_t),
1233 .mode = 0644,
1234 .proc_handler = proc_dointvec,
1235 },
1236 {
1237 .procname = "hugepages_treat_as_movable",
1238 .data = &hugepages_treat_as_movable,
1239 .maxlen = sizeof(int),
1240 .mode = 0644,
1241 .proc_handler = proc_dointvec,
1242 },
1243 {
1244 .procname = "nr_overcommit_hugepages",
1245 .data = NULL,
1246 .maxlen = sizeof(unsigned long),
1247 .mode = 0644,
1248 .proc_handler = hugetlb_overcommit_handler,
1249 .extra1 = (void *)&hugetlb_zero,
1250 .extra2 = (void *)&hugetlb_infinity,
1251 },
1252 #endif
1253 {
1254 .procname = "lowmem_reserve_ratio",
1255 .data = &sysctl_lowmem_reserve_ratio,
1256 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1257 .mode = 0644,
1258 .proc_handler = lowmem_reserve_ratio_sysctl_handler,
1259 },
1260 {
1261 .procname = "drop_caches",
1262 .data = &sysctl_drop_caches,
1263 .maxlen = sizeof(int),
1264 .mode = 0644,
1265 .proc_handler = drop_caches_sysctl_handler,
1266 .extra1 = &one,
1267 .extra2 = &three,
1268 },
1269 #ifdef CONFIG_COMPACTION
1270 {
1271 .procname = "compact_memory",
1272 .data = &sysctl_compact_memory,
1273 .maxlen = sizeof(int),
1274 .mode = 0200,
1275 .proc_handler = sysctl_compaction_handler,
1276 },
1277 {
1278 .procname = "extfrag_threshold",
1279 .data = &sysctl_extfrag_threshold,
1280 .maxlen = sizeof(int),
1281 .mode = 0644,
1282 .proc_handler = sysctl_extfrag_handler,
1283 .extra1 = &min_extfrag_threshold,
1284 .extra2 = &max_extfrag_threshold,
1285 },
1286
1287 #endif /* CONFIG_COMPACTION */
1288 {
1289 .procname = "min_free_kbytes",
1290 .data = &min_free_kbytes,
1291 .maxlen = sizeof(min_free_kbytes),
1292 .mode = 0644,
1293 .proc_handler = min_free_kbytes_sysctl_handler,
1294 .extra1 = &zero,
1295 },
1296 {
1297 .procname = "percpu_pagelist_fraction",
1298 .data = &percpu_pagelist_fraction,
1299 .maxlen = sizeof(percpu_pagelist_fraction),
1300 .mode = 0644,
1301 .proc_handler = percpu_pagelist_fraction_sysctl_handler,
1302 .extra1 = &min_percpu_pagelist_fract,
1303 },
1304 #ifdef CONFIG_MMU
1305 {
1306 .procname = "max_map_count",
1307 .data = &sysctl_max_map_count,
1308 .maxlen = sizeof(sysctl_max_map_count),
1309 .mode = 0644,
1310 .proc_handler = proc_dointvec_minmax,
1311 .extra1 = &zero,
1312 },
1313 #else
1314 {
1315 .procname = "nr_trim_pages",
1316 .data = &sysctl_nr_trim_pages,
1317 .maxlen = sizeof(sysctl_nr_trim_pages),
1318 .mode = 0644,
1319 .proc_handler = proc_dointvec_minmax,
1320 .extra1 = &zero,
1321 },
1322 #endif
1323 {
1324 .procname = "laptop_mode",
1325 .data = &laptop_mode,
1326 .maxlen = sizeof(laptop_mode),
1327 .mode = 0644,
1328 .proc_handler = proc_dointvec_jiffies,
1329 },
1330 {
1331 .procname = "block_dump",
1332 .data = &block_dump,
1333 .maxlen = sizeof(block_dump),
1334 .mode = 0644,
1335 .proc_handler = proc_dointvec,
1336 .extra1 = &zero,
1337 },
1338 {
1339 .procname = "vfs_cache_pressure",
1340 .data = &sysctl_vfs_cache_pressure,
1341 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1342 .mode = 0644,
1343 .proc_handler = proc_dointvec,
1344 .extra1 = &zero,
1345 },
1346 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1347 {
1348 .procname = "legacy_va_layout",
1349 .data = &sysctl_legacy_va_layout,
1350 .maxlen = sizeof(sysctl_legacy_va_layout),
1351 .mode = 0644,
1352 .proc_handler = proc_dointvec,
1353 .extra1 = &zero,
1354 },
1355 #endif
1356 #ifdef CONFIG_NUMA
1357 {
1358 .procname = "zone_reclaim_mode",
1359 .data = &zone_reclaim_mode,
1360 .maxlen = sizeof(zone_reclaim_mode),
1361 .mode = 0644,
1362 .proc_handler = proc_dointvec,
1363 .extra1 = &zero,
1364 },
1365 {
1366 .procname = "min_unmapped_ratio",
1367 .data = &sysctl_min_unmapped_ratio,
1368 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1369 .mode = 0644,
1370 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler,
1371 .extra1 = &zero,
1372 .extra2 = &one_hundred,
1373 },
1374 {
1375 .procname = "min_slab_ratio",
1376 .data = &sysctl_min_slab_ratio,
1377 .maxlen = sizeof(sysctl_min_slab_ratio),
1378 .mode = 0644,
1379 .proc_handler = sysctl_min_slab_ratio_sysctl_handler,
1380 .extra1 = &zero,
1381 .extra2 = &one_hundred,
1382 },
1383 #endif
1384 #ifdef CONFIG_SMP
1385 {
1386 .procname = "stat_interval",
1387 .data = &sysctl_stat_interval,
1388 .maxlen = sizeof(sysctl_stat_interval),
1389 .mode = 0644,
1390 .proc_handler = proc_dointvec_jiffies,
1391 },
1392 #endif
1393 #ifdef CONFIG_MMU
1394 {
1395 .procname = "mmap_min_addr",
1396 .data = &dac_mmap_min_addr,
1397 .maxlen = sizeof(unsigned long),
1398 .mode = 0644,
1399 .proc_handler = mmap_min_addr_handler,
1400 },
1401 #endif
1402 #ifdef CONFIG_NUMA
1403 {
1404 .procname = "numa_zonelist_order",
1405 .data = &numa_zonelist_order,
1406 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1407 .mode = 0644,
1408 .proc_handler = numa_zonelist_order_handler,
1409 },
1410 #endif
1411 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1412 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1413 {
1414 .procname = "vdso_enabled",
1415 .data = &vdso_enabled,
1416 .maxlen = sizeof(vdso_enabled),
1417 .mode = 0644,
1418 .proc_handler = proc_dointvec,
1419 .extra1 = &zero,
1420 },
1421 #endif
1422 #ifdef CONFIG_HIGHMEM
1423 {
1424 .procname = "highmem_is_dirtyable",
1425 .data = &vm_highmem_is_dirtyable,
1426 .maxlen = sizeof(vm_highmem_is_dirtyable),
1427 .mode = 0644,
1428 .proc_handler = proc_dointvec_minmax,
1429 .extra1 = &zero,
1430 .extra2 = &one,
1431 },
1432 #endif
1433 {
1434 .procname = "scan_unevictable_pages",
1435 .data = &scan_unevictable_pages,
1436 .maxlen = sizeof(scan_unevictable_pages),
1437 .mode = 0644,
1438 .proc_handler = scan_unevictable_handler,
1439 },
1440 #ifdef CONFIG_MEMORY_FAILURE
1441 {
1442 .procname = "memory_failure_early_kill",
1443 .data = &sysctl_memory_failure_early_kill,
1444 .maxlen = sizeof(sysctl_memory_failure_early_kill),
1445 .mode = 0644,
1446 .proc_handler = proc_dointvec_minmax,
1447 .extra1 = &zero,
1448 .extra2 = &one,
1449 },
1450 {
1451 .procname = "memory_failure_recovery",
1452 .data = &sysctl_memory_failure_recovery,
1453 .maxlen = sizeof(sysctl_memory_failure_recovery),
1454 .mode = 0644,
1455 .proc_handler = proc_dointvec_minmax,
1456 .extra1 = &zero,
1457 .extra2 = &one,
1458 },
1459 #endif
1460 {
1461 .procname = "user_reserve_kbytes",
1462 .data = &sysctl_user_reserve_kbytes,
1463 .maxlen = sizeof(sysctl_user_reserve_kbytes),
1464 .mode = 0644,
1465 .proc_handler = proc_doulongvec_minmax,
1466 },
1467 {
1468 .procname = "admin_reserve_kbytes",
1469 .data = &sysctl_admin_reserve_kbytes,
1470 .maxlen = sizeof(sysctl_admin_reserve_kbytes),
1471 .mode = 0644,
1472 .proc_handler = proc_doulongvec_minmax,
1473 },
1474 { }
1475 };
1476
1477 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1478 static struct ctl_table binfmt_misc_table[] = {
1479 { }
1480 };
1481 #endif
1482
1483 static struct ctl_table fs_table[] = {
1484 {
1485 .procname = "inode-nr",
1486 .data = &inodes_stat,
1487 .maxlen = 2*sizeof(long),
1488 .mode = 0444,
1489 .proc_handler = proc_nr_inodes,
1490 },
1491 {
1492 .procname = "inode-state",
1493 .data = &inodes_stat,
1494 .maxlen = 7*sizeof(long),
1495 .mode = 0444,
1496 .proc_handler = proc_nr_inodes,
1497 },
1498 {
1499 .procname = "file-nr",
1500 .data = &files_stat,
1501 .maxlen = sizeof(files_stat),
1502 .mode = 0444,
1503 .proc_handler = proc_nr_files,
1504 },
1505 {
1506 .procname = "file-max",
1507 .data = &files_stat.max_files,
1508 .maxlen = sizeof(files_stat.max_files),
1509 .mode = 0644,
1510 .proc_handler = proc_doulongvec_minmax,
1511 },
1512 {
1513 .procname = "nr_open",
1514 .data = &sysctl_nr_open,
1515 .maxlen = sizeof(int),
1516 .mode = 0644,
1517 .proc_handler = proc_dointvec_minmax,
1518 .extra1 = &sysctl_nr_open_min,
1519 .extra2 = &sysctl_nr_open_max,
1520 },
1521 {
1522 .procname = "dentry-state",
1523 .data = &dentry_stat,
1524 .maxlen = 6*sizeof(long),
1525 .mode = 0444,
1526 .proc_handler = proc_nr_dentry,
1527 },
1528 {
1529 .procname = "overflowuid",
1530 .data = &fs_overflowuid,
1531 .maxlen = sizeof(int),
1532 .mode = 0644,
1533 .proc_handler = proc_dointvec_minmax,
1534 .extra1 = &minolduid,
1535 .extra2 = &maxolduid,
1536 },
1537 {
1538 .procname = "overflowgid",
1539 .data = &fs_overflowgid,
1540 .maxlen = sizeof(int),
1541 .mode = 0644,
1542 .proc_handler = proc_dointvec_minmax,
1543 .extra1 = &minolduid,
1544 .extra2 = &maxolduid,
1545 },
1546 #ifdef CONFIG_FILE_LOCKING
1547 {
1548 .procname = "leases-enable",
1549 .data = &leases_enable,
1550 .maxlen = sizeof(int),
1551 .mode = 0644,
1552 .proc_handler = proc_dointvec,
1553 },
1554 #endif
1555 #ifdef CONFIG_DNOTIFY
1556 {
1557 .procname = "dir-notify-enable",
1558 .data = &dir_notify_enable,
1559 .maxlen = sizeof(int),
1560 .mode = 0644,
1561 .proc_handler = proc_dointvec,
1562 },
1563 #endif
1564 #ifdef CONFIG_MMU
1565 #ifdef CONFIG_FILE_LOCKING
1566 {
1567 .procname = "lease-break-time",
1568 .data = &lease_break_time,
1569 .maxlen = sizeof(int),
1570 .mode = 0644,
1571 .proc_handler = proc_dointvec,
1572 },
1573 #endif
1574 #ifdef CONFIG_AIO
1575 {
1576 .procname = "aio-nr",
1577 .data = &aio_nr,
1578 .maxlen = sizeof(aio_nr),
1579 .mode = 0444,
1580 .proc_handler = proc_doulongvec_minmax,
1581 },
1582 {
1583 .procname = "aio-max-nr",
1584 .data = &aio_max_nr,
1585 .maxlen = sizeof(aio_max_nr),
1586 .mode = 0644,
1587 .proc_handler = proc_doulongvec_minmax,
1588 },
1589 #endif /* CONFIG_AIO */
1590 #ifdef CONFIG_INOTIFY_USER
1591 {
1592 .procname = "inotify",
1593 .mode = 0555,
1594 .child = inotify_table,
1595 },
1596 #endif
1597 #ifdef CONFIG_EPOLL
1598 {
1599 .procname = "epoll",
1600 .mode = 0555,
1601 .child = epoll_table,
1602 },
1603 #endif
1604 #endif
1605 {
1606 .procname = "protected_symlinks",
1607 .data = &sysctl_protected_symlinks,
1608 .maxlen = sizeof(int),
1609 .mode = 0600,
1610 .proc_handler = proc_dointvec_minmax,
1611 .extra1 = &zero,
1612 .extra2 = &one,
1613 },
1614 {
1615 .procname = "protected_hardlinks",
1616 .data = &sysctl_protected_hardlinks,
1617 .maxlen = sizeof(int),
1618 .mode = 0600,
1619 .proc_handler = proc_dointvec_minmax,
1620 .extra1 = &zero,
1621 .extra2 = &one,
1622 },
1623 {
1624 .procname = "suid_dumpable",
1625 .data = &suid_dumpable,
1626 .maxlen = sizeof(int),
1627 .mode = 0644,
1628 .proc_handler = proc_dointvec_minmax_coredump,
1629 .extra1 = &zero,
1630 .extra2 = &two,
1631 },
1632 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1633 {
1634 .procname = "binfmt_misc",
1635 .mode = 0555,
1636 .child = binfmt_misc_table,
1637 },
1638 #endif
1639 {
1640 .procname = "pipe-max-size",
1641 .data = &pipe_max_size,
1642 .maxlen = sizeof(int),
1643 .mode = 0644,
1644 .proc_handler = &pipe_proc_fn,
1645 .extra1 = &pipe_min_size,
1646 },
1647 { }
1648 };
1649
1650 static struct ctl_table debug_table[] = {
1651 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
1652 {
1653 .procname = "exception-trace",
1654 .data = &show_unhandled_signals,
1655 .maxlen = sizeof(int),
1656 .mode = 0644,
1657 .proc_handler = proc_dointvec
1658 },
1659 #endif
1660 #if defined(CONFIG_OPTPROBES)
1661 {
1662 .procname = "kprobes-optimization",
1663 .data = &sysctl_kprobes_optimization,
1664 .maxlen = sizeof(int),
1665 .mode = 0644,
1666 .proc_handler = proc_kprobes_optimization_handler,
1667 .extra1 = &zero,
1668 .extra2 = &one,
1669 },
1670 #endif
1671 { }
1672 };
1673
1674 static struct ctl_table dev_table[] = {
1675 { }
1676 };
1677
1678 int __init sysctl_init(void)
1679 {
1680 struct ctl_table_header *hdr;
1681
1682 hdr = register_sysctl_table(sysctl_base_table);
1683 kmemleak_not_leak(hdr);
1684 return 0;
1685 }
1686
1687 #endif /* CONFIG_SYSCTL */
1688
1689 /*
1690 * /proc/sys support
1691 */
1692
1693 #ifdef CONFIG_PROC_SYSCTL
1694
1695 static int _proc_do_string(void* data, int maxlen, int write,
1696 void __user *buffer,
1697 size_t *lenp, loff_t *ppos)
1698 {
1699 size_t len;
1700 char __user *p;
1701 char c;
1702
1703 if (!data || !maxlen || !*lenp) {
1704 *lenp = 0;
1705 return 0;
1706 }
1707
1708 if (write) {
1709 len = 0;
1710 p = buffer;
1711 while (len < *lenp) {
1712 if (get_user(c, p++))
1713 return -EFAULT;
1714 if (c == 0 || c == '\n')
1715 break;
1716 len++;
1717 }
1718 if (len >= maxlen)
1719 len = maxlen-1;
1720 if(copy_from_user(data, buffer, len))
1721 return -EFAULT;
1722 ((char *) data)[len] = 0;
1723 *ppos += *lenp;
1724 } else {
1725 len = strlen(data);
1726 if (len > maxlen)
1727 len = maxlen;
1728
1729 if (*ppos > len) {
1730 *lenp = 0;
1731 return 0;
1732 }
1733
1734 data += *ppos;
1735 len -= *ppos;
1736
1737 if (len > *lenp)
1738 len = *lenp;
1739 if (len)
1740 if(copy_to_user(buffer, data, len))
1741 return -EFAULT;
1742 if (len < *lenp) {
1743 if(put_user('\n', ((char __user *) buffer) + len))
1744 return -EFAULT;
1745 len++;
1746 }
1747 *lenp = len;
1748 *ppos += len;
1749 }
1750 return 0;
1751 }
1752
1753 /**
1754 * proc_dostring - read a string sysctl
1755 * @table: the sysctl table
1756 * @write: %TRUE if this is a write to the sysctl file
1757 * @buffer: the user buffer
1758 * @lenp: the size of the user buffer
1759 * @ppos: file position
1760 *
1761 * Reads/writes a string from/to the user buffer. If the kernel
1762 * buffer provided is not large enough to hold the string, the
1763 * string is truncated. The copied string is %NULL-terminated.
1764 * If the string is being read by the user process, it is copied
1765 * and a newline '\n' is added. It is truncated if the buffer is
1766 * not large enough.
1767 *
1768 * Returns 0 on success.
1769 */
1770 int proc_dostring(struct ctl_table *table, int write,
1771 void __user *buffer, size_t *lenp, loff_t *ppos)
1772 {
1773 return _proc_do_string(table->data, table->maxlen, write,
1774 buffer, lenp, ppos);
1775 }
1776
1777 static size_t proc_skip_spaces(char **buf)
1778 {
1779 size_t ret;
1780 char *tmp = skip_spaces(*buf);
1781 ret = tmp - *buf;
1782 *buf = tmp;
1783 return ret;
1784 }
1785
1786 static void proc_skip_char(char **buf, size_t *size, const char v)
1787 {
1788 while (*size) {
1789 if (**buf != v)
1790 break;
1791 (*size)--;
1792 (*buf)++;
1793 }
1794 }
1795
1796 #define TMPBUFLEN 22
1797 /**
1798 * proc_get_long - reads an ASCII formatted integer from a user buffer
1799 *
1800 * @buf: a kernel buffer
1801 * @size: size of the kernel buffer
1802 * @val: this is where the number will be stored
1803 * @neg: set to %TRUE if number is negative
1804 * @perm_tr: a vector which contains the allowed trailers
1805 * @perm_tr_len: size of the perm_tr vector
1806 * @tr: pointer to store the trailer character
1807 *
1808 * In case of success %0 is returned and @buf and @size are updated with
1809 * the amount of bytes read. If @tr is non-NULL and a trailing
1810 * character exists (size is non-zero after returning from this
1811 * function), @tr is updated with the trailing character.
1812 */
1813 static int proc_get_long(char **buf, size_t *size,
1814 unsigned long *val, bool *neg,
1815 const char *perm_tr, unsigned perm_tr_len, char *tr)
1816 {
1817 int len;
1818 char *p, tmp[TMPBUFLEN];
1819
1820 if (!*size)
1821 return -EINVAL;
1822
1823 len = *size;
1824 if (len > TMPBUFLEN - 1)
1825 len = TMPBUFLEN - 1;
1826
1827 memcpy(tmp, *buf, len);
1828
1829 tmp[len] = 0;
1830 p = tmp;
1831 if (*p == '-' && *size > 1) {
1832 *neg = true;
1833 p++;
1834 } else
1835 *neg = false;
1836 if (!isdigit(*p))
1837 return -EINVAL;
1838
1839 *val = simple_strtoul(p, &p, 0);
1840
1841 len = p - tmp;
1842
1843 /* We don't know if the next char is whitespace thus we may accept
1844 * invalid integers (e.g. 1234...a) or two integers instead of one
1845 * (e.g. 123...1). So lets not allow such large numbers. */
1846 if (len == TMPBUFLEN - 1)
1847 return -EINVAL;
1848
1849 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
1850 return -EINVAL;
1851
1852 if (tr && (len < *size))
1853 *tr = *p;
1854
1855 *buf += len;
1856 *size -= len;
1857
1858 return 0;
1859 }
1860
1861 /**
1862 * proc_put_long - converts an integer to a decimal ASCII formatted string
1863 *
1864 * @buf: the user buffer
1865 * @size: the size of the user buffer
1866 * @val: the integer to be converted
1867 * @neg: sign of the number, %TRUE for negative
1868 *
1869 * In case of success %0 is returned and @buf and @size are updated with
1870 * the amount of bytes written.
1871 */
1872 static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
1873 bool neg)
1874 {
1875 int len;
1876 char tmp[TMPBUFLEN], *p = tmp;
1877
1878 sprintf(p, "%s%lu", neg ? "-" : "", val);
1879 len = strlen(tmp);
1880 if (len > *size)
1881 len = *size;
1882 if (copy_to_user(*buf, tmp, len))
1883 return -EFAULT;
1884 *size -= len;
1885 *buf += len;
1886 return 0;
1887 }
1888 #undef TMPBUFLEN
1889
1890 static int proc_put_char(void __user **buf, size_t *size, char c)
1891 {
1892 if (*size) {
1893 char __user **buffer = (char __user **)buf;
1894 if (put_user(c, *buffer))
1895 return -EFAULT;
1896 (*size)--, (*buffer)++;
1897 *buf = *buffer;
1898 }
1899 return 0;
1900 }
1901
1902 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
1903 int *valp,
1904 int write, void *data)
1905 {
1906 if (write) {
1907 *valp = *negp ? -*lvalp : *lvalp;
1908 } else {
1909 int val = *valp;
1910 if (val < 0) {
1911 *negp = true;
1912 *lvalp = (unsigned long)-val;
1913 } else {
1914 *negp = false;
1915 *lvalp = (unsigned long)val;
1916 }
1917 }
1918 return 0;
1919 }
1920
1921 static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
1922
1923 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
1924 int write, void __user *buffer,
1925 size_t *lenp, loff_t *ppos,
1926 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
1927 int write, void *data),
1928 void *data)
1929 {
1930 int *i, vleft, first = 1, err = 0;
1931 unsigned long page = 0;
1932 size_t left;
1933 char *kbuf;
1934
1935 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
1936 *lenp = 0;
1937 return 0;
1938 }
1939
1940 i = (int *) tbl_data;
1941 vleft = table->maxlen / sizeof(*i);
1942 left = *lenp;
1943
1944 if (!conv)
1945 conv = do_proc_dointvec_conv;
1946
1947 if (write) {
1948 if (left > PAGE_SIZE - 1)
1949 left = PAGE_SIZE - 1;
1950 page = __get_free_page(GFP_TEMPORARY);
1951 kbuf = (char *) page;
1952 if (!kbuf)
1953 return -ENOMEM;
1954 if (copy_from_user(kbuf, buffer, left)) {
1955 err = -EFAULT;
1956 goto free;
1957 }
1958 kbuf[left] = 0;
1959 }
1960
1961 for (; left && vleft--; i++, first=0) {
1962 unsigned long lval;
1963 bool neg;
1964
1965 if (write) {
1966 left -= proc_skip_spaces(&kbuf);
1967
1968 if (!left)
1969 break;
1970 err = proc_get_long(&kbuf, &left, &lval, &neg,
1971 proc_wspace_sep,
1972 sizeof(proc_wspace_sep), NULL);
1973 if (err)
1974 break;
1975 if (conv(&neg, &lval, i, 1, data)) {
1976 err = -EINVAL;
1977 break;
1978 }
1979 } else {
1980 if (conv(&neg, &lval, i, 0, data)) {
1981 err = -EINVAL;
1982 break;
1983 }
1984 if (!first)
1985 err = proc_put_char(&buffer, &left, '\t');
1986 if (err)
1987 break;
1988 err = proc_put_long(&buffer, &left, lval, neg);
1989 if (err)
1990 break;
1991 }
1992 }
1993
1994 if (!write && !first && left && !err)
1995 err = proc_put_char(&buffer, &left, '\n');
1996 if (write && !err && left)
1997 left -= proc_skip_spaces(&kbuf);
1998 free:
1999 if (write) {
2000 free_page(page);
2001 if (first)
2002 return err ? : -EINVAL;
2003 }
2004 *lenp -= left;
2005 *ppos += *lenp;
2006 return err;
2007 }
2008
2009 static int do_proc_dointvec(struct ctl_table *table, int write,
2010 void __user *buffer, size_t *lenp, loff_t *ppos,
2011 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2012 int write, void *data),
2013 void *data)
2014 {
2015 return __do_proc_dointvec(table->data, table, write,
2016 buffer, lenp, ppos, conv, data);
2017 }
2018
2019 /**
2020 * proc_dointvec - read a vector of integers
2021 * @table: the sysctl table
2022 * @write: %TRUE if this is a write to the sysctl file
2023 * @buffer: the user buffer
2024 * @lenp: the size of the user buffer
2025 * @ppos: file position
2026 *
2027 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2028 * values from/to the user buffer, treated as an ASCII string.
2029 *
2030 * Returns 0 on success.
2031 */
2032 int proc_dointvec(struct ctl_table *table, int write,
2033 void __user *buffer, size_t *lenp, loff_t *ppos)
2034 {
2035 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2036 NULL,NULL);
2037 }
2038
2039 /*
2040 * Taint values can only be increased
2041 * This means we can safely use a temporary.
2042 */
2043 static int proc_taint(struct ctl_table *table, int write,
2044 void __user *buffer, size_t *lenp, loff_t *ppos)
2045 {
2046 struct ctl_table t;
2047 unsigned long tmptaint = get_taint();
2048 int err;
2049
2050 if (write && !capable(CAP_SYS_ADMIN))
2051 return -EPERM;
2052
2053 t = *table;
2054 t.data = &tmptaint;
2055 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
2056 if (err < 0)
2057 return err;
2058
2059 if (write) {
2060 /*
2061 * Poor man's atomic or. Not worth adding a primitive
2062 * to everyone's atomic.h for this
2063 */
2064 int i;
2065 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2066 if ((tmptaint >> i) & 1)
2067 add_taint(i, LOCKDEP_STILL_OK);
2068 }
2069 }
2070
2071 return err;
2072 }
2073
2074 #ifdef CONFIG_PRINTK
2075 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
2076 void __user *buffer, size_t *lenp, loff_t *ppos)
2077 {
2078 if (write && !capable(CAP_SYS_ADMIN))
2079 return -EPERM;
2080
2081 return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2082 }
2083 #endif
2084
2085 struct do_proc_dointvec_minmax_conv_param {
2086 int *min;
2087 int *max;
2088 };
2089
2090 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
2091 int *valp,
2092 int write, void *data)
2093 {
2094 struct do_proc_dointvec_minmax_conv_param *param = data;
2095 if (write) {
2096 int val = *negp ? -*lvalp : *lvalp;
2097 if ((param->min && *param->min > val) ||
2098 (param->max && *param->max < val))
2099 return -EINVAL;
2100 *valp = val;
2101 } else {
2102 int val = *valp;
2103 if (val < 0) {
2104 *negp = true;
2105 *lvalp = (unsigned long)-val;
2106 } else {
2107 *negp = false;
2108 *lvalp = (unsigned long)val;
2109 }
2110 }
2111 return 0;
2112 }
2113
2114 /**
2115 * proc_dointvec_minmax - read a vector of integers with min/max values
2116 * @table: the sysctl table
2117 * @write: %TRUE if this is a write to the sysctl file
2118 * @buffer: the user buffer
2119 * @lenp: the size of the user buffer
2120 * @ppos: file position
2121 *
2122 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2123 * values from/to the user buffer, treated as an ASCII string.
2124 *
2125 * This routine will ensure the values are within the range specified by
2126 * table->extra1 (min) and table->extra2 (max).
2127 *
2128 * Returns 0 on success.
2129 */
2130 int proc_dointvec_minmax(struct ctl_table *table, int write,
2131 void __user *buffer, size_t *lenp, loff_t *ppos)
2132 {
2133 struct do_proc_dointvec_minmax_conv_param param = {
2134 .min = (int *) table->extra1,
2135 .max = (int *) table->extra2,
2136 };
2137 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2138 do_proc_dointvec_minmax_conv, &param);
2139 }
2140
2141 static void validate_coredump_safety(void)
2142 {
2143 #ifdef CONFIG_COREDUMP
2144 if (suid_dumpable == SUID_DUMP_ROOT &&
2145 core_pattern[0] != '/' && core_pattern[0] != '|') {
2146 printk(KERN_WARNING "Unsafe core_pattern used with "\
2147 "suid_dumpable=2. Pipe handler or fully qualified "\
2148 "core dump path required.\n");
2149 }
2150 #endif
2151 }
2152
2153 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
2154 void __user *buffer, size_t *lenp, loff_t *ppos)
2155 {
2156 int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2157 if (!error)
2158 validate_coredump_safety();
2159 return error;
2160 }
2161
2162 #ifdef CONFIG_COREDUMP
2163 static int proc_dostring_coredump(struct ctl_table *table, int write,
2164 void __user *buffer, size_t *lenp, loff_t *ppos)
2165 {
2166 int error = proc_dostring(table, write, buffer, lenp, ppos);
2167 if (!error)
2168 validate_coredump_safety();
2169 return error;
2170 }
2171 #endif
2172
2173 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2174 void __user *buffer,
2175 size_t *lenp, loff_t *ppos,
2176 unsigned long convmul,
2177 unsigned long convdiv)
2178 {
2179 unsigned long *i, *min, *max;
2180 int vleft, first = 1, err = 0;
2181 unsigned long page = 0;
2182 size_t left;
2183 char *kbuf;
2184
2185 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
2186 *lenp = 0;
2187 return 0;
2188 }
2189
2190 i = (unsigned long *) data;
2191 min = (unsigned long *) table->extra1;
2192 max = (unsigned long *) table->extra2;
2193 vleft = table->maxlen / sizeof(unsigned long);
2194 left = *lenp;
2195
2196 if (write) {
2197 if (left > PAGE_SIZE - 1)
2198 left = PAGE_SIZE - 1;
2199 page = __get_free_page(GFP_TEMPORARY);
2200 kbuf = (char *) page;
2201 if (!kbuf)
2202 return -ENOMEM;
2203 if (copy_from_user(kbuf, buffer, left)) {
2204 err = -EFAULT;
2205 goto free;
2206 }
2207 kbuf[left] = 0;
2208 }
2209
2210 for (; left && vleft--; i++, first = 0) {
2211 unsigned long val;
2212
2213 if (write) {
2214 bool neg;
2215
2216 left -= proc_skip_spaces(&kbuf);
2217
2218 err = proc_get_long(&kbuf, &left, &val, &neg,
2219 proc_wspace_sep,
2220 sizeof(proc_wspace_sep), NULL);
2221 if (err)
2222 break;
2223 if (neg)
2224 continue;
2225 if ((min && val < *min) || (max && val > *max))
2226 continue;
2227 *i = val;
2228 } else {
2229 val = convdiv * (*i) / convmul;
2230 if (!first) {
2231 err = proc_put_char(&buffer, &left, '\t');
2232 if (err)
2233 break;
2234 }
2235 err = proc_put_long(&buffer, &left, val, false);
2236 if (err)
2237 break;
2238 }
2239 }
2240
2241 if (!write && !first && left && !err)
2242 err = proc_put_char(&buffer, &left, '\n');
2243 if (write && !err)
2244 left -= proc_skip_spaces(&kbuf);
2245 free:
2246 if (write) {
2247 free_page(page);
2248 if (first)
2249 return err ? : -EINVAL;
2250 }
2251 *lenp -= left;
2252 *ppos += *lenp;
2253 return err;
2254 }
2255
2256 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2257 void __user *buffer,
2258 size_t *lenp, loff_t *ppos,
2259 unsigned long convmul,
2260 unsigned long convdiv)
2261 {
2262 return __do_proc_doulongvec_minmax(table->data, table, write,
2263 buffer, lenp, ppos, convmul, convdiv);
2264 }
2265
2266 /**
2267 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2268 * @table: the sysctl table
2269 * @write: %TRUE if this is a write to the sysctl file
2270 * @buffer: the user buffer
2271 * @lenp: the size of the user buffer
2272 * @ppos: file position
2273 *
2274 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2275 * values from/to the user buffer, treated as an ASCII string.
2276 *
2277 * This routine will ensure the values are within the range specified by
2278 * table->extra1 (min) and table->extra2 (max).
2279 *
2280 * Returns 0 on success.
2281 */
2282 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2283 void __user *buffer, size_t *lenp, loff_t *ppos)
2284 {
2285 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
2286 }
2287
2288 /**
2289 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2290 * @table: the sysctl table
2291 * @write: %TRUE if this is a write to the sysctl file
2292 * @buffer: the user buffer
2293 * @lenp: the size of the user buffer
2294 * @ppos: file position
2295 *
2296 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2297 * values from/to the user buffer, treated as an ASCII string. The values
2298 * are treated as milliseconds, and converted to jiffies when they are stored.
2299 *
2300 * This routine will ensure the values are within the range specified by
2301 * table->extra1 (min) and table->extra2 (max).
2302 *
2303 * Returns 0 on success.
2304 */
2305 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2306 void __user *buffer,
2307 size_t *lenp, loff_t *ppos)
2308 {
2309 return do_proc_doulongvec_minmax(table, write, buffer,
2310 lenp, ppos, HZ, 1000l);
2311 }
2312
2313
2314 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
2315 int *valp,
2316 int write, void *data)
2317 {
2318 if (write) {
2319 if (*lvalp > LONG_MAX / HZ)
2320 return 1;
2321 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2322 } else {
2323 int val = *valp;
2324 unsigned long lval;
2325 if (val < 0) {
2326 *negp = true;
2327 lval = (unsigned long)-val;
2328 } else {
2329 *negp = false;
2330 lval = (unsigned long)val;
2331 }
2332 *lvalp = lval / HZ;
2333 }
2334 return 0;
2335 }
2336
2337 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
2338 int *valp,
2339 int write, void *data)
2340 {
2341 if (write) {
2342 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2343 return 1;
2344 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2345 } else {
2346 int val = *valp;
2347 unsigned long lval;
2348 if (val < 0) {
2349 *negp = true;
2350 lval = (unsigned long)-val;
2351 } else {
2352 *negp = false;
2353 lval = (unsigned long)val;
2354 }
2355 *lvalp = jiffies_to_clock_t(lval);
2356 }
2357 return 0;
2358 }
2359
2360 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
2361 int *valp,
2362 int write, void *data)
2363 {
2364 if (write) {
2365 unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2366
2367 if (jif > INT_MAX)
2368 return 1;
2369 *valp = (int)jif;
2370 } else {
2371 int val = *valp;
2372 unsigned long lval;
2373 if (val < 0) {
2374 *negp = true;
2375 lval = (unsigned long)-val;
2376 } else {
2377 *negp = false;
2378 lval = (unsigned long)val;
2379 }
2380 *lvalp = jiffies_to_msecs(lval);
2381 }
2382 return 0;
2383 }
2384
2385 /**
2386 * proc_dointvec_jiffies - read a vector of integers as seconds
2387 * @table: the sysctl table
2388 * @write: %TRUE if this is a write to the sysctl file
2389 * @buffer: the user buffer
2390 * @lenp: the size of the user buffer
2391 * @ppos: file position
2392 *
2393 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2394 * values from/to the user buffer, treated as an ASCII string.
2395 * The values read are assumed to be in seconds, and are converted into
2396 * jiffies.
2397 *
2398 * Returns 0 on success.
2399 */
2400 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2401 void __user *buffer, size_t *lenp, loff_t *ppos)
2402 {
2403 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2404 do_proc_dointvec_jiffies_conv,NULL);
2405 }
2406
2407 /**
2408 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2409 * @table: the sysctl table
2410 * @write: %TRUE if this is a write to the sysctl file
2411 * @buffer: the user buffer
2412 * @lenp: the size of the user buffer
2413 * @ppos: pointer to the file position
2414 *
2415 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2416 * values from/to the user buffer, treated as an ASCII string.
2417 * The values read are assumed to be in 1/USER_HZ seconds, and
2418 * are converted into jiffies.
2419 *
2420 * Returns 0 on success.
2421 */
2422 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2423 void __user *buffer, size_t *lenp, loff_t *ppos)
2424 {
2425 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2426 do_proc_dointvec_userhz_jiffies_conv,NULL);
2427 }
2428
2429 /**
2430 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2431 * @table: the sysctl table
2432 * @write: %TRUE if this is a write to the sysctl file
2433 * @buffer: the user buffer
2434 * @lenp: the size of the user buffer
2435 * @ppos: file position
2436 * @ppos: the current position in the file
2437 *
2438 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2439 * values from/to the user buffer, treated as an ASCII string.
2440 * The values read are assumed to be in 1/1000 seconds, and
2441 * are converted into jiffies.
2442 *
2443 * Returns 0 on success.
2444 */
2445 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2446 void __user *buffer, size_t *lenp, loff_t *ppos)
2447 {
2448 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2449 do_proc_dointvec_ms_jiffies_conv, NULL);
2450 }
2451
2452 static int proc_do_cad_pid(struct ctl_table *table, int write,
2453 void __user *buffer, size_t *lenp, loff_t *ppos)
2454 {
2455 struct pid *new_pid;
2456 pid_t tmp;
2457 int r;
2458
2459 tmp = pid_vnr(cad_pid);
2460
2461 r = __do_proc_dointvec(&tmp, table, write, buffer,
2462 lenp, ppos, NULL, NULL);
2463 if (r || !write)
2464 return r;
2465
2466 new_pid = find_get_pid(tmp);
2467 if (!new_pid)
2468 return -ESRCH;
2469
2470 put_pid(xchg(&cad_pid, new_pid));
2471 return 0;
2472 }
2473
2474 /**
2475 * proc_do_large_bitmap - read/write from/to a large bitmap
2476 * @table: the sysctl table
2477 * @write: %TRUE if this is a write to the sysctl file
2478 * @buffer: the user buffer
2479 * @lenp: the size of the user buffer
2480 * @ppos: file position
2481 *
2482 * The bitmap is stored at table->data and the bitmap length (in bits)
2483 * in table->maxlen.
2484 *
2485 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2486 * large bitmaps may be represented in a compact manner. Writing into
2487 * the file will clear the bitmap then update it with the given input.
2488 *
2489 * Returns 0 on success.
2490 */
2491 int proc_do_large_bitmap(struct ctl_table *table, int write,
2492 void __user *buffer, size_t *lenp, loff_t *ppos)
2493 {
2494 int err = 0;
2495 bool first = 1;
2496 size_t left = *lenp;
2497 unsigned long bitmap_len = table->maxlen;
2498 unsigned long *bitmap = (unsigned long *) table->data;
2499 unsigned long *tmp_bitmap = NULL;
2500 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
2501
2502 if (!bitmap_len || !left || (*ppos && !write)) {
2503 *lenp = 0;
2504 return 0;
2505 }
2506
2507 if (write) {
2508 unsigned long page = 0;
2509 char *kbuf;
2510
2511 if (left > PAGE_SIZE - 1)
2512 left = PAGE_SIZE - 1;
2513
2514 page = __get_free_page(GFP_TEMPORARY);
2515 kbuf = (char *) page;
2516 if (!kbuf)
2517 return -ENOMEM;
2518 if (copy_from_user(kbuf, buffer, left)) {
2519 free_page(page);
2520 return -EFAULT;
2521 }
2522 kbuf[left] = 0;
2523
2524 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long),
2525 GFP_KERNEL);
2526 if (!tmp_bitmap) {
2527 free_page(page);
2528 return -ENOMEM;
2529 }
2530 proc_skip_char(&kbuf, &left, '\n');
2531 while (!err && left) {
2532 unsigned long val_a, val_b;
2533 bool neg;
2534
2535 err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a,
2536 sizeof(tr_a), &c);
2537 if (err)
2538 break;
2539 if (val_a >= bitmap_len || neg) {
2540 err = -EINVAL;
2541 break;
2542 }
2543
2544 val_b = val_a;
2545 if (left) {
2546 kbuf++;
2547 left--;
2548 }
2549
2550 if (c == '-') {
2551 err = proc_get_long(&kbuf, &left, &val_b,
2552 &neg, tr_b, sizeof(tr_b),
2553 &c);
2554 if (err)
2555 break;
2556 if (val_b >= bitmap_len || neg ||
2557 val_a > val_b) {
2558 err = -EINVAL;
2559 break;
2560 }
2561 if (left) {
2562 kbuf++;
2563 left--;
2564 }
2565 }
2566
2567 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
2568 first = 0;
2569 proc_skip_char(&kbuf, &left, '\n');
2570 }
2571 free_page(page);
2572 } else {
2573 unsigned long bit_a, bit_b = 0;
2574
2575 while (left) {
2576 bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
2577 if (bit_a >= bitmap_len)
2578 break;
2579 bit_b = find_next_zero_bit(bitmap, bitmap_len,
2580 bit_a + 1) - 1;
2581
2582 if (!first) {
2583 err = proc_put_char(&buffer, &left, ',');
2584 if (err)
2585 break;
2586 }
2587 err = proc_put_long(&buffer, &left, bit_a, false);
2588 if (err)
2589 break;
2590 if (bit_a != bit_b) {
2591 err = proc_put_char(&buffer, &left, '-');
2592 if (err)
2593 break;
2594 err = proc_put_long(&buffer, &left, bit_b, false);
2595 if (err)
2596 break;
2597 }
2598
2599 first = 0; bit_b++;
2600 }
2601 if (!err)
2602 err = proc_put_char(&buffer, &left, '\n');
2603 }
2604
2605 if (!err) {
2606 if (write) {
2607 if (*ppos)
2608 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
2609 else
2610 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
2611 }
2612 kfree(tmp_bitmap);
2613 *lenp -= left;
2614 *ppos += *lenp;
2615 return 0;
2616 } else {
2617 kfree(tmp_bitmap);
2618 return err;
2619 }
2620 }
2621
2622 #else /* CONFIG_PROC_SYSCTL */
2623
2624 int proc_dostring(struct ctl_table *table, int write,
2625 void __user *buffer, size_t *lenp, loff_t *ppos)
2626 {
2627 return -ENOSYS;
2628 }
2629
2630 int proc_dointvec(struct ctl_table *table, int write,
2631 void __user *buffer, size_t *lenp, loff_t *ppos)
2632 {
2633 return -ENOSYS;
2634 }
2635
2636 int proc_dointvec_minmax(struct ctl_table *table, int write,
2637 void __user *buffer, size_t *lenp, loff_t *ppos)
2638 {
2639 return -ENOSYS;
2640 }
2641
2642 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2643 void __user *buffer, size_t *lenp, loff_t *ppos)
2644 {
2645 return -ENOSYS;
2646 }
2647
2648 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2649 void __user *buffer, size_t *lenp, loff_t *ppos)
2650 {
2651 return -ENOSYS;
2652 }
2653
2654 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2655 void __user *buffer, size_t *lenp, loff_t *ppos)
2656 {
2657 return -ENOSYS;
2658 }
2659
2660 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2661 void __user *buffer, size_t *lenp, loff_t *ppos)
2662 {
2663 return -ENOSYS;
2664 }
2665
2666 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2667 void __user *buffer,
2668 size_t *lenp, loff_t *ppos)
2669 {
2670 return -ENOSYS;
2671 }
2672
2673
2674 #endif /* CONFIG_PROC_SYSCTL */
2675
2676 /*
2677 * No sense putting this after each symbol definition, twice,
2678 * exception granted :-)
2679 */
2680 EXPORT_SYMBOL(proc_dointvec);
2681 EXPORT_SYMBOL(proc_dointvec_jiffies);
2682 EXPORT_SYMBOL(proc_dointvec_minmax);
2683 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2684 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2685 EXPORT_SYMBOL(proc_dostring);
2686 EXPORT_SYMBOL(proc_doulongvec_minmax);
2687 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
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