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Merge branch 'akpm' (patches from Andrew)
[deliverable/linux.git] / kernel / sysctl.c
1 /*
2 * sysctl.c: General linux system control interface
3 *
4 * Begun 24 March 1995, Stephen Tweedie
5 * Added /proc support, Dec 1995
6 * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas.
7 * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver.
8 * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver.
9 * Dynamic registration fixes, Stephen Tweedie.
10 * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn.
11 * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris
12 * Horn.
13 * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer.
14 * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer.
15 * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill
16 * Wendling.
17 * The list_for_each() macro wasn't appropriate for the sysctl loop.
18 * Removed it and replaced it with older style, 03/23/00, Bill Wendling
19 */
20
21 #include <linux/module.h>
22 #include <linux/aio.h>
23 #include <linux/mm.h>
24 #include <linux/swap.h>
25 #include <linux/slab.h>
26 #include <linux/sysctl.h>
27 #include <linux/bitmap.h>
28 #include <linux/signal.h>
29 #include <linux/printk.h>
30 #include <linux/proc_fs.h>
31 #include <linux/security.h>
32 #include <linux/ctype.h>
33 #include <linux/kmemcheck.h>
34 #include <linux/kmemleak.h>
35 #include <linux/fs.h>
36 #include <linux/init.h>
37 #include <linux/kernel.h>
38 #include <linux/kobject.h>
39 #include <linux/net.h>
40 #include <linux/sysrq.h>
41 #include <linux/highuid.h>
42 #include <linux/writeback.h>
43 #include <linux/ratelimit.h>
44 #include <linux/compaction.h>
45 #include <linux/hugetlb.h>
46 #include <linux/initrd.h>
47 #include <linux/key.h>
48 #include <linux/times.h>
49 #include <linux/limits.h>
50 #include <linux/dcache.h>
51 #include <linux/dnotify.h>
52 #include <linux/syscalls.h>
53 #include <linux/vmstat.h>
54 #include <linux/nfs_fs.h>
55 #include <linux/acpi.h>
56 #include <linux/reboot.h>
57 #include <linux/ftrace.h>
58 #include <linux/perf_event.h>
59 #include <linux/kprobes.h>
60 #include <linux/pipe_fs_i.h>
61 #include <linux/oom.h>
62 #include <linux/kmod.h>
63 #include <linux/capability.h>
64 #include <linux/binfmts.h>
65 #include <linux/sched/sysctl.h>
66 #include <linux/kexec.h>
67
68 #include <asm/uaccess.h>
69 #include <asm/processor.h>
70
71 #ifdef CONFIG_X86
72 #include <asm/nmi.h>
73 #include <asm/stacktrace.h>
74 #include <asm/io.h>
75 #endif
76 #ifdef CONFIG_SPARC
77 #include <asm/setup.h>
78 #endif
79 #ifdef CONFIG_BSD_PROCESS_ACCT
80 #include <linux/acct.h>
81 #endif
82 #ifdef CONFIG_RT_MUTEXES
83 #include <linux/rtmutex.h>
84 #endif
85 #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
86 #include <linux/lockdep.h>
87 #endif
88 #ifdef CONFIG_CHR_DEV_SG
89 #include <scsi/sg.h>
90 #endif
91
92 #ifdef CONFIG_LOCKUP_DETECTOR
93 #include <linux/nmi.h>
94 #endif
95
96 #if defined(CONFIG_SYSCTL)
97
98 /* External variables not in a header file. */
99 extern int suid_dumpable;
100 #ifdef CONFIG_COREDUMP
101 extern int core_uses_pid;
102 extern char core_pattern[];
103 extern unsigned int core_pipe_limit;
104 #endif
105 extern int pid_max;
106 extern int pid_max_min, pid_max_max;
107 extern int percpu_pagelist_fraction;
108 extern int compat_log;
109 extern int latencytop_enabled;
110 extern int sysctl_nr_open_min, sysctl_nr_open_max;
111 #ifndef CONFIG_MMU
112 extern int sysctl_nr_trim_pages;
113 #endif
114
115 /* Constants used for minimum and maximum */
116 #ifdef CONFIG_LOCKUP_DETECTOR
117 static int sixty = 60;
118 #endif
119
120 static int __maybe_unused neg_one = -1;
121
122 static int zero;
123 static int __maybe_unused one = 1;
124 static int __maybe_unused two = 2;
125 static int __maybe_unused four = 4;
126 static unsigned long one_ul = 1;
127 static int one_hundred = 100;
128 #ifdef CONFIG_PRINTK
129 static int ten_thousand = 10000;
130 #endif
131
132 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
133 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
134
135 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
136 static int maxolduid = 65535;
137 static int minolduid;
138
139 static int ngroups_max = NGROUPS_MAX;
140 static const int cap_last_cap = CAP_LAST_CAP;
141
142 /*this is needed for proc_doulongvec_minmax of sysctl_hung_task_timeout_secs */
143 #ifdef CONFIG_DETECT_HUNG_TASK
144 static unsigned long hung_task_timeout_max = (LONG_MAX/HZ);
145 #endif
146
147 #ifdef CONFIG_INOTIFY_USER
148 #include <linux/inotify.h>
149 #endif
150 #ifdef CONFIG_SPARC
151 #endif
152
153 #ifdef __hppa__
154 extern int pwrsw_enabled;
155 #endif
156
157 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
158 extern int unaligned_enabled;
159 #endif
160
161 #ifdef CONFIG_IA64
162 extern int unaligned_dump_stack;
163 #endif
164
165 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
166 extern int no_unaligned_warning;
167 #endif
168
169 #ifdef CONFIG_PROC_SYSCTL
170
171 #define SYSCTL_WRITES_LEGACY -1
172 #define SYSCTL_WRITES_WARN 0
173 #define SYSCTL_WRITES_STRICT 1
174
175 static int sysctl_writes_strict = SYSCTL_WRITES_WARN;
176
177 static int proc_do_cad_pid(struct ctl_table *table, int write,
178 void __user *buffer, size_t *lenp, loff_t *ppos);
179 static int proc_taint(struct ctl_table *table, int write,
180 void __user *buffer, size_t *lenp, loff_t *ppos);
181 #endif
182
183 #ifdef CONFIG_PRINTK
184 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
185 void __user *buffer, size_t *lenp, loff_t *ppos);
186 #endif
187
188 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
189 void __user *buffer, size_t *lenp, loff_t *ppos);
190 #ifdef CONFIG_COREDUMP
191 static int proc_dostring_coredump(struct ctl_table *table, int write,
192 void __user *buffer, size_t *lenp, loff_t *ppos);
193 #endif
194
195 #ifdef CONFIG_MAGIC_SYSRQ
196 /* Note: sysrq code uses it's own private copy */
197 static int __sysrq_enabled = CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE;
198
199 static int sysrq_sysctl_handler(struct ctl_table *table, int write,
200 void __user *buffer, size_t *lenp,
201 loff_t *ppos)
202 {
203 int error;
204
205 error = proc_dointvec(table, write, buffer, lenp, ppos);
206 if (error)
207 return error;
208
209 if (write)
210 sysrq_toggle_support(__sysrq_enabled);
211
212 return 0;
213 }
214
215 #endif
216
217 static struct ctl_table kern_table[];
218 static struct ctl_table vm_table[];
219 static struct ctl_table fs_table[];
220 static struct ctl_table debug_table[];
221 static struct ctl_table dev_table[];
222 extern struct ctl_table random_table[];
223 #ifdef CONFIG_EPOLL
224 extern struct ctl_table epoll_table[];
225 #endif
226
227 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
228 int sysctl_legacy_va_layout;
229 #endif
230
231 /* The default sysctl tables: */
232
233 static struct ctl_table sysctl_base_table[] = {
234 {
235 .procname = "kernel",
236 .mode = 0555,
237 .child = kern_table,
238 },
239 {
240 .procname = "vm",
241 .mode = 0555,
242 .child = vm_table,
243 },
244 {
245 .procname = "fs",
246 .mode = 0555,
247 .child = fs_table,
248 },
249 {
250 .procname = "debug",
251 .mode = 0555,
252 .child = debug_table,
253 },
254 {
255 .procname = "dev",
256 .mode = 0555,
257 .child = dev_table,
258 },
259 { }
260 };
261
262 #ifdef CONFIG_SCHED_DEBUG
263 static int min_sched_granularity_ns = 100000; /* 100 usecs */
264 static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */
265 static int min_wakeup_granularity_ns; /* 0 usecs */
266 static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */
267 #ifdef CONFIG_SMP
268 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
269 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
270 #endif /* CONFIG_SMP */
271 #endif /* CONFIG_SCHED_DEBUG */
272
273 #ifdef CONFIG_COMPACTION
274 static int min_extfrag_threshold;
275 static int max_extfrag_threshold = 1000;
276 #endif
277
278 static struct ctl_table kern_table[] = {
279 {
280 .procname = "sched_child_runs_first",
281 .data = &sysctl_sched_child_runs_first,
282 .maxlen = sizeof(unsigned int),
283 .mode = 0644,
284 .proc_handler = proc_dointvec,
285 },
286 #ifdef CONFIG_SCHED_DEBUG
287 {
288 .procname = "sched_min_granularity_ns",
289 .data = &sysctl_sched_min_granularity,
290 .maxlen = sizeof(unsigned int),
291 .mode = 0644,
292 .proc_handler = sched_proc_update_handler,
293 .extra1 = &min_sched_granularity_ns,
294 .extra2 = &max_sched_granularity_ns,
295 },
296 {
297 .procname = "sched_latency_ns",
298 .data = &sysctl_sched_latency,
299 .maxlen = sizeof(unsigned int),
300 .mode = 0644,
301 .proc_handler = sched_proc_update_handler,
302 .extra1 = &min_sched_granularity_ns,
303 .extra2 = &max_sched_granularity_ns,
304 },
305 {
306 .procname = "sched_wakeup_granularity_ns",
307 .data = &sysctl_sched_wakeup_granularity,
308 .maxlen = sizeof(unsigned int),
309 .mode = 0644,
310 .proc_handler = sched_proc_update_handler,
311 .extra1 = &min_wakeup_granularity_ns,
312 .extra2 = &max_wakeup_granularity_ns,
313 },
314 #ifdef CONFIG_SMP
315 {
316 .procname = "sched_tunable_scaling",
317 .data = &sysctl_sched_tunable_scaling,
318 .maxlen = sizeof(enum sched_tunable_scaling),
319 .mode = 0644,
320 .proc_handler = sched_proc_update_handler,
321 .extra1 = &min_sched_tunable_scaling,
322 .extra2 = &max_sched_tunable_scaling,
323 },
324 {
325 .procname = "sched_migration_cost_ns",
326 .data = &sysctl_sched_migration_cost,
327 .maxlen = sizeof(unsigned int),
328 .mode = 0644,
329 .proc_handler = proc_dointvec,
330 },
331 {
332 .procname = "sched_nr_migrate",
333 .data = &sysctl_sched_nr_migrate,
334 .maxlen = sizeof(unsigned int),
335 .mode = 0644,
336 .proc_handler = proc_dointvec,
337 },
338 {
339 .procname = "sched_time_avg_ms",
340 .data = &sysctl_sched_time_avg,
341 .maxlen = sizeof(unsigned int),
342 .mode = 0644,
343 .proc_handler = proc_dointvec,
344 },
345 {
346 .procname = "sched_shares_window_ns",
347 .data = &sysctl_sched_shares_window,
348 .maxlen = sizeof(unsigned int),
349 .mode = 0644,
350 .proc_handler = proc_dointvec,
351 },
352 #endif /* CONFIG_SMP */
353 #ifdef CONFIG_NUMA_BALANCING
354 {
355 .procname = "numa_balancing_scan_delay_ms",
356 .data = &sysctl_numa_balancing_scan_delay,
357 .maxlen = sizeof(unsigned int),
358 .mode = 0644,
359 .proc_handler = proc_dointvec,
360 },
361 {
362 .procname = "numa_balancing_scan_period_min_ms",
363 .data = &sysctl_numa_balancing_scan_period_min,
364 .maxlen = sizeof(unsigned int),
365 .mode = 0644,
366 .proc_handler = proc_dointvec,
367 },
368 {
369 .procname = "numa_balancing_scan_period_max_ms",
370 .data = &sysctl_numa_balancing_scan_period_max,
371 .maxlen = sizeof(unsigned int),
372 .mode = 0644,
373 .proc_handler = proc_dointvec,
374 },
375 {
376 .procname = "numa_balancing_scan_size_mb",
377 .data = &sysctl_numa_balancing_scan_size,
378 .maxlen = sizeof(unsigned int),
379 .mode = 0644,
380 .proc_handler = proc_dointvec_minmax,
381 .extra1 = &one,
382 },
383 {
384 .procname = "numa_balancing",
385 .data = NULL, /* filled in by handler */
386 .maxlen = sizeof(unsigned int),
387 .mode = 0644,
388 .proc_handler = sysctl_numa_balancing,
389 .extra1 = &zero,
390 .extra2 = &one,
391 },
392 #endif /* CONFIG_NUMA_BALANCING */
393 #endif /* CONFIG_SCHED_DEBUG */
394 {
395 .procname = "sched_rt_period_us",
396 .data = &sysctl_sched_rt_period,
397 .maxlen = sizeof(unsigned int),
398 .mode = 0644,
399 .proc_handler = sched_rt_handler,
400 },
401 {
402 .procname = "sched_rt_runtime_us",
403 .data = &sysctl_sched_rt_runtime,
404 .maxlen = sizeof(int),
405 .mode = 0644,
406 .proc_handler = sched_rt_handler,
407 },
408 {
409 .procname = "sched_rr_timeslice_ms",
410 .data = &sched_rr_timeslice,
411 .maxlen = sizeof(int),
412 .mode = 0644,
413 .proc_handler = sched_rr_handler,
414 },
415 #ifdef CONFIG_SCHED_AUTOGROUP
416 {
417 .procname = "sched_autogroup_enabled",
418 .data = &sysctl_sched_autogroup_enabled,
419 .maxlen = sizeof(unsigned int),
420 .mode = 0644,
421 .proc_handler = proc_dointvec_minmax,
422 .extra1 = &zero,
423 .extra2 = &one,
424 },
425 #endif
426 #ifdef CONFIG_CFS_BANDWIDTH
427 {
428 .procname = "sched_cfs_bandwidth_slice_us",
429 .data = &sysctl_sched_cfs_bandwidth_slice,
430 .maxlen = sizeof(unsigned int),
431 .mode = 0644,
432 .proc_handler = proc_dointvec_minmax,
433 .extra1 = &one,
434 },
435 #endif
436 #ifdef CONFIG_PROVE_LOCKING
437 {
438 .procname = "prove_locking",
439 .data = &prove_locking,
440 .maxlen = sizeof(int),
441 .mode = 0644,
442 .proc_handler = proc_dointvec,
443 },
444 #endif
445 #ifdef CONFIG_LOCK_STAT
446 {
447 .procname = "lock_stat",
448 .data = &lock_stat,
449 .maxlen = sizeof(int),
450 .mode = 0644,
451 .proc_handler = proc_dointvec,
452 },
453 #endif
454 {
455 .procname = "panic",
456 .data = &panic_timeout,
457 .maxlen = sizeof(int),
458 .mode = 0644,
459 .proc_handler = proc_dointvec,
460 },
461 #ifdef CONFIG_COREDUMP
462 {
463 .procname = "core_uses_pid",
464 .data = &core_uses_pid,
465 .maxlen = sizeof(int),
466 .mode = 0644,
467 .proc_handler = proc_dointvec,
468 },
469 {
470 .procname = "core_pattern",
471 .data = core_pattern,
472 .maxlen = CORENAME_MAX_SIZE,
473 .mode = 0644,
474 .proc_handler = proc_dostring_coredump,
475 },
476 {
477 .procname = "core_pipe_limit",
478 .data = &core_pipe_limit,
479 .maxlen = sizeof(unsigned int),
480 .mode = 0644,
481 .proc_handler = proc_dointvec,
482 },
483 #endif
484 #ifdef CONFIG_PROC_SYSCTL
485 {
486 .procname = "tainted",
487 .maxlen = sizeof(long),
488 .mode = 0644,
489 .proc_handler = proc_taint,
490 },
491 {
492 .procname = "sysctl_writes_strict",
493 .data = &sysctl_writes_strict,
494 .maxlen = sizeof(int),
495 .mode = 0644,
496 .proc_handler = proc_dointvec_minmax,
497 .extra1 = &neg_one,
498 .extra2 = &one,
499 },
500 #endif
501 #ifdef CONFIG_LATENCYTOP
502 {
503 .procname = "latencytop",
504 .data = &latencytop_enabled,
505 .maxlen = sizeof(int),
506 .mode = 0644,
507 .proc_handler = proc_dointvec,
508 },
509 #endif
510 #ifdef CONFIG_BLK_DEV_INITRD
511 {
512 .procname = "real-root-dev",
513 .data = &real_root_dev,
514 .maxlen = sizeof(int),
515 .mode = 0644,
516 .proc_handler = proc_dointvec,
517 },
518 #endif
519 {
520 .procname = "print-fatal-signals",
521 .data = &print_fatal_signals,
522 .maxlen = sizeof(int),
523 .mode = 0644,
524 .proc_handler = proc_dointvec,
525 },
526 #ifdef CONFIG_SPARC
527 {
528 .procname = "reboot-cmd",
529 .data = reboot_command,
530 .maxlen = 256,
531 .mode = 0644,
532 .proc_handler = proc_dostring,
533 },
534 {
535 .procname = "stop-a",
536 .data = &stop_a_enabled,
537 .maxlen = sizeof (int),
538 .mode = 0644,
539 .proc_handler = proc_dointvec,
540 },
541 {
542 .procname = "scons-poweroff",
543 .data = &scons_pwroff,
544 .maxlen = sizeof (int),
545 .mode = 0644,
546 .proc_handler = proc_dointvec,
547 },
548 #endif
549 #ifdef CONFIG_SPARC64
550 {
551 .procname = "tsb-ratio",
552 .data = &sysctl_tsb_ratio,
553 .maxlen = sizeof (int),
554 .mode = 0644,
555 .proc_handler = proc_dointvec,
556 },
557 #endif
558 #ifdef __hppa__
559 {
560 .procname = "soft-power",
561 .data = &pwrsw_enabled,
562 .maxlen = sizeof (int),
563 .mode = 0644,
564 .proc_handler = proc_dointvec,
565 },
566 #endif
567 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
568 {
569 .procname = "unaligned-trap",
570 .data = &unaligned_enabled,
571 .maxlen = sizeof (int),
572 .mode = 0644,
573 .proc_handler = proc_dointvec,
574 },
575 #endif
576 {
577 .procname = "ctrl-alt-del",
578 .data = &C_A_D,
579 .maxlen = sizeof(int),
580 .mode = 0644,
581 .proc_handler = proc_dointvec,
582 },
583 #ifdef CONFIG_FUNCTION_TRACER
584 {
585 .procname = "ftrace_enabled",
586 .data = &ftrace_enabled,
587 .maxlen = sizeof(int),
588 .mode = 0644,
589 .proc_handler = ftrace_enable_sysctl,
590 },
591 #endif
592 #ifdef CONFIG_STACK_TRACER
593 {
594 .procname = "stack_tracer_enabled",
595 .data = &stack_tracer_enabled,
596 .maxlen = sizeof(int),
597 .mode = 0644,
598 .proc_handler = stack_trace_sysctl,
599 },
600 #endif
601 #ifdef CONFIG_TRACING
602 {
603 .procname = "ftrace_dump_on_oops",
604 .data = &ftrace_dump_on_oops,
605 .maxlen = sizeof(int),
606 .mode = 0644,
607 .proc_handler = proc_dointvec,
608 },
609 {
610 .procname = "traceoff_on_warning",
611 .data = &__disable_trace_on_warning,
612 .maxlen = sizeof(__disable_trace_on_warning),
613 .mode = 0644,
614 .proc_handler = proc_dointvec,
615 },
616 {
617 .procname = "tracepoint_printk",
618 .data = &tracepoint_printk,
619 .maxlen = sizeof(tracepoint_printk),
620 .mode = 0644,
621 .proc_handler = proc_dointvec,
622 },
623 #endif
624 #ifdef CONFIG_KEXEC
625 {
626 .procname = "kexec_load_disabled",
627 .data = &kexec_load_disabled,
628 .maxlen = sizeof(int),
629 .mode = 0644,
630 /* only handle a transition from default "0" to "1" */
631 .proc_handler = proc_dointvec_minmax,
632 .extra1 = &one,
633 .extra2 = &one,
634 },
635 #endif
636 #ifdef CONFIG_MODULES
637 {
638 .procname = "modprobe",
639 .data = &modprobe_path,
640 .maxlen = KMOD_PATH_LEN,
641 .mode = 0644,
642 .proc_handler = proc_dostring,
643 },
644 {
645 .procname = "modules_disabled",
646 .data = &modules_disabled,
647 .maxlen = sizeof(int),
648 .mode = 0644,
649 /* only handle a transition from default "0" to "1" */
650 .proc_handler = proc_dointvec_minmax,
651 .extra1 = &one,
652 .extra2 = &one,
653 },
654 #endif
655 #ifdef CONFIG_UEVENT_HELPER
656 {
657 .procname = "hotplug",
658 .data = &uevent_helper,
659 .maxlen = UEVENT_HELPER_PATH_LEN,
660 .mode = 0644,
661 .proc_handler = proc_dostring,
662 },
663 #endif
664 #ifdef CONFIG_CHR_DEV_SG
665 {
666 .procname = "sg-big-buff",
667 .data = &sg_big_buff,
668 .maxlen = sizeof (int),
669 .mode = 0444,
670 .proc_handler = proc_dointvec,
671 },
672 #endif
673 #ifdef CONFIG_BSD_PROCESS_ACCT
674 {
675 .procname = "acct",
676 .data = &acct_parm,
677 .maxlen = 3*sizeof(int),
678 .mode = 0644,
679 .proc_handler = proc_dointvec,
680 },
681 #endif
682 #ifdef CONFIG_MAGIC_SYSRQ
683 {
684 .procname = "sysrq",
685 .data = &__sysrq_enabled,
686 .maxlen = sizeof (int),
687 .mode = 0644,
688 .proc_handler = sysrq_sysctl_handler,
689 },
690 #endif
691 #ifdef CONFIG_PROC_SYSCTL
692 {
693 .procname = "cad_pid",
694 .data = NULL,
695 .maxlen = sizeof (int),
696 .mode = 0600,
697 .proc_handler = proc_do_cad_pid,
698 },
699 #endif
700 {
701 .procname = "threads-max",
702 .data = NULL,
703 .maxlen = sizeof(int),
704 .mode = 0644,
705 .proc_handler = sysctl_max_threads,
706 },
707 {
708 .procname = "random",
709 .mode = 0555,
710 .child = random_table,
711 },
712 {
713 .procname = "usermodehelper",
714 .mode = 0555,
715 .child = usermodehelper_table,
716 },
717 {
718 .procname = "overflowuid",
719 .data = &overflowuid,
720 .maxlen = sizeof(int),
721 .mode = 0644,
722 .proc_handler = proc_dointvec_minmax,
723 .extra1 = &minolduid,
724 .extra2 = &maxolduid,
725 },
726 {
727 .procname = "overflowgid",
728 .data = &overflowgid,
729 .maxlen = sizeof(int),
730 .mode = 0644,
731 .proc_handler = proc_dointvec_minmax,
732 .extra1 = &minolduid,
733 .extra2 = &maxolduid,
734 },
735 #ifdef CONFIG_S390
736 #ifdef CONFIG_MATHEMU
737 {
738 .procname = "ieee_emulation_warnings",
739 .data = &sysctl_ieee_emulation_warnings,
740 .maxlen = sizeof(int),
741 .mode = 0644,
742 .proc_handler = proc_dointvec,
743 },
744 #endif
745 {
746 .procname = "userprocess_debug",
747 .data = &show_unhandled_signals,
748 .maxlen = sizeof(int),
749 .mode = 0644,
750 .proc_handler = proc_dointvec,
751 },
752 #endif
753 {
754 .procname = "pid_max",
755 .data = &pid_max,
756 .maxlen = sizeof (int),
757 .mode = 0644,
758 .proc_handler = proc_dointvec_minmax,
759 .extra1 = &pid_max_min,
760 .extra2 = &pid_max_max,
761 },
762 {
763 .procname = "panic_on_oops",
764 .data = &panic_on_oops,
765 .maxlen = sizeof(int),
766 .mode = 0644,
767 .proc_handler = proc_dointvec,
768 },
769 #if defined CONFIG_PRINTK
770 {
771 .procname = "printk",
772 .data = &console_loglevel,
773 .maxlen = 4*sizeof(int),
774 .mode = 0644,
775 .proc_handler = proc_dointvec,
776 },
777 {
778 .procname = "printk_ratelimit",
779 .data = &printk_ratelimit_state.interval,
780 .maxlen = sizeof(int),
781 .mode = 0644,
782 .proc_handler = proc_dointvec_jiffies,
783 },
784 {
785 .procname = "printk_ratelimit_burst",
786 .data = &printk_ratelimit_state.burst,
787 .maxlen = sizeof(int),
788 .mode = 0644,
789 .proc_handler = proc_dointvec,
790 },
791 {
792 .procname = "printk_delay",
793 .data = &printk_delay_msec,
794 .maxlen = sizeof(int),
795 .mode = 0644,
796 .proc_handler = proc_dointvec_minmax,
797 .extra1 = &zero,
798 .extra2 = &ten_thousand,
799 },
800 {
801 .procname = "dmesg_restrict",
802 .data = &dmesg_restrict,
803 .maxlen = sizeof(int),
804 .mode = 0644,
805 .proc_handler = proc_dointvec_minmax_sysadmin,
806 .extra1 = &zero,
807 .extra2 = &one,
808 },
809 {
810 .procname = "kptr_restrict",
811 .data = &kptr_restrict,
812 .maxlen = sizeof(int),
813 .mode = 0644,
814 .proc_handler = proc_dointvec_minmax_sysadmin,
815 .extra1 = &zero,
816 .extra2 = &two,
817 },
818 #endif
819 {
820 .procname = "ngroups_max",
821 .data = &ngroups_max,
822 .maxlen = sizeof (int),
823 .mode = 0444,
824 .proc_handler = proc_dointvec,
825 },
826 {
827 .procname = "cap_last_cap",
828 .data = (void *)&cap_last_cap,
829 .maxlen = sizeof(int),
830 .mode = 0444,
831 .proc_handler = proc_dointvec,
832 },
833 #if defined(CONFIG_LOCKUP_DETECTOR)
834 {
835 .procname = "watchdog",
836 .data = &watchdog_user_enabled,
837 .maxlen = sizeof (int),
838 .mode = 0644,
839 .proc_handler = proc_watchdog,
840 .extra1 = &zero,
841 .extra2 = &one,
842 },
843 {
844 .procname = "watchdog_thresh",
845 .data = &watchdog_thresh,
846 .maxlen = sizeof(int),
847 .mode = 0644,
848 .proc_handler = proc_watchdog_thresh,
849 .extra1 = &zero,
850 .extra2 = &sixty,
851 },
852 {
853 .procname = "nmi_watchdog",
854 .data = &nmi_watchdog_enabled,
855 .maxlen = sizeof (int),
856 .mode = 0644,
857 .proc_handler = proc_nmi_watchdog,
858 .extra1 = &zero,
859 #if defined(CONFIG_HAVE_NMI_WATCHDOG) || defined(CONFIG_HARDLOCKUP_DETECTOR)
860 .extra2 = &one,
861 #else
862 .extra2 = &zero,
863 #endif
864 },
865 {
866 .procname = "soft_watchdog",
867 .data = &soft_watchdog_enabled,
868 .maxlen = sizeof (int),
869 .mode = 0644,
870 .proc_handler = proc_soft_watchdog,
871 .extra1 = &zero,
872 .extra2 = &one,
873 },
874 {
875 .procname = "watchdog_cpumask",
876 .data = &watchdog_cpumask_bits,
877 .maxlen = NR_CPUS,
878 .mode = 0644,
879 .proc_handler = proc_watchdog_cpumask,
880 },
881 {
882 .procname = "softlockup_panic",
883 .data = &softlockup_panic,
884 .maxlen = sizeof(int),
885 .mode = 0644,
886 .proc_handler = proc_dointvec_minmax,
887 .extra1 = &zero,
888 .extra2 = &one,
889 },
890 #ifdef CONFIG_SMP
891 {
892 .procname = "softlockup_all_cpu_backtrace",
893 .data = &sysctl_softlockup_all_cpu_backtrace,
894 .maxlen = sizeof(int),
895 .mode = 0644,
896 .proc_handler = proc_dointvec_minmax,
897 .extra1 = &zero,
898 .extra2 = &one,
899 },
900 #endif /* CONFIG_SMP */
901 #endif
902 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
903 {
904 .procname = "unknown_nmi_panic",
905 .data = &unknown_nmi_panic,
906 .maxlen = sizeof (int),
907 .mode = 0644,
908 .proc_handler = proc_dointvec,
909 },
910 #endif
911 #if defined(CONFIG_X86)
912 {
913 .procname = "panic_on_unrecovered_nmi",
914 .data = &panic_on_unrecovered_nmi,
915 .maxlen = sizeof(int),
916 .mode = 0644,
917 .proc_handler = proc_dointvec,
918 },
919 {
920 .procname = "panic_on_io_nmi",
921 .data = &panic_on_io_nmi,
922 .maxlen = sizeof(int),
923 .mode = 0644,
924 .proc_handler = proc_dointvec,
925 },
926 #ifdef CONFIG_DEBUG_STACKOVERFLOW
927 {
928 .procname = "panic_on_stackoverflow",
929 .data = &sysctl_panic_on_stackoverflow,
930 .maxlen = sizeof(int),
931 .mode = 0644,
932 .proc_handler = proc_dointvec,
933 },
934 #endif
935 {
936 .procname = "bootloader_type",
937 .data = &bootloader_type,
938 .maxlen = sizeof (int),
939 .mode = 0444,
940 .proc_handler = proc_dointvec,
941 },
942 {
943 .procname = "bootloader_version",
944 .data = &bootloader_version,
945 .maxlen = sizeof (int),
946 .mode = 0444,
947 .proc_handler = proc_dointvec,
948 },
949 {
950 .procname = "kstack_depth_to_print",
951 .data = &kstack_depth_to_print,
952 .maxlen = sizeof(int),
953 .mode = 0644,
954 .proc_handler = proc_dointvec,
955 },
956 {
957 .procname = "io_delay_type",
958 .data = &io_delay_type,
959 .maxlen = sizeof(int),
960 .mode = 0644,
961 .proc_handler = proc_dointvec,
962 },
963 #endif
964 #if defined(CONFIG_MMU)
965 {
966 .procname = "randomize_va_space",
967 .data = &randomize_va_space,
968 .maxlen = sizeof(int),
969 .mode = 0644,
970 .proc_handler = proc_dointvec,
971 },
972 #endif
973 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
974 {
975 .procname = "spin_retry",
976 .data = &spin_retry,
977 .maxlen = sizeof (int),
978 .mode = 0644,
979 .proc_handler = proc_dointvec,
980 },
981 #endif
982 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
983 {
984 .procname = "acpi_video_flags",
985 .data = &acpi_realmode_flags,
986 .maxlen = sizeof (unsigned long),
987 .mode = 0644,
988 .proc_handler = proc_doulongvec_minmax,
989 },
990 #endif
991 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
992 {
993 .procname = "ignore-unaligned-usertrap",
994 .data = &no_unaligned_warning,
995 .maxlen = sizeof (int),
996 .mode = 0644,
997 .proc_handler = proc_dointvec,
998 },
999 #endif
1000 #ifdef CONFIG_IA64
1001 {
1002 .procname = "unaligned-dump-stack",
1003 .data = &unaligned_dump_stack,
1004 .maxlen = sizeof (int),
1005 .mode = 0644,
1006 .proc_handler = proc_dointvec,
1007 },
1008 #endif
1009 #ifdef CONFIG_DETECT_HUNG_TASK
1010 {
1011 .procname = "hung_task_panic",
1012 .data = &sysctl_hung_task_panic,
1013 .maxlen = sizeof(int),
1014 .mode = 0644,
1015 .proc_handler = proc_dointvec_minmax,
1016 .extra1 = &zero,
1017 .extra2 = &one,
1018 },
1019 {
1020 .procname = "hung_task_check_count",
1021 .data = &sysctl_hung_task_check_count,
1022 .maxlen = sizeof(int),
1023 .mode = 0644,
1024 .proc_handler = proc_dointvec_minmax,
1025 .extra1 = &zero,
1026 },
1027 {
1028 .procname = "hung_task_timeout_secs",
1029 .data = &sysctl_hung_task_timeout_secs,
1030 .maxlen = sizeof(unsigned long),
1031 .mode = 0644,
1032 .proc_handler = proc_dohung_task_timeout_secs,
1033 .extra2 = &hung_task_timeout_max,
1034 },
1035 {
1036 .procname = "hung_task_warnings",
1037 .data = &sysctl_hung_task_warnings,
1038 .maxlen = sizeof(int),
1039 .mode = 0644,
1040 .proc_handler = proc_dointvec_minmax,
1041 .extra1 = &neg_one,
1042 },
1043 #endif
1044 #ifdef CONFIG_COMPAT
1045 {
1046 .procname = "compat-log",
1047 .data = &compat_log,
1048 .maxlen = sizeof (int),
1049 .mode = 0644,
1050 .proc_handler = proc_dointvec,
1051 },
1052 #endif
1053 #ifdef CONFIG_RT_MUTEXES
1054 {
1055 .procname = "max_lock_depth",
1056 .data = &max_lock_depth,
1057 .maxlen = sizeof(int),
1058 .mode = 0644,
1059 .proc_handler = proc_dointvec,
1060 },
1061 #endif
1062 {
1063 .procname = "poweroff_cmd",
1064 .data = &poweroff_cmd,
1065 .maxlen = POWEROFF_CMD_PATH_LEN,
1066 .mode = 0644,
1067 .proc_handler = proc_dostring,
1068 },
1069 #ifdef CONFIG_KEYS
1070 {
1071 .procname = "keys",
1072 .mode = 0555,
1073 .child = key_sysctls,
1074 },
1075 #endif
1076 #ifdef CONFIG_PERF_EVENTS
1077 /*
1078 * User-space scripts rely on the existence of this file
1079 * as a feature check for perf_events being enabled.
1080 *
1081 * So it's an ABI, do not remove!
1082 */
1083 {
1084 .procname = "perf_event_paranoid",
1085 .data = &sysctl_perf_event_paranoid,
1086 .maxlen = sizeof(sysctl_perf_event_paranoid),
1087 .mode = 0644,
1088 .proc_handler = proc_dointvec,
1089 },
1090 {
1091 .procname = "perf_event_mlock_kb",
1092 .data = &sysctl_perf_event_mlock,
1093 .maxlen = sizeof(sysctl_perf_event_mlock),
1094 .mode = 0644,
1095 .proc_handler = proc_dointvec,
1096 },
1097 {
1098 .procname = "perf_event_max_sample_rate",
1099 .data = &sysctl_perf_event_sample_rate,
1100 .maxlen = sizeof(sysctl_perf_event_sample_rate),
1101 .mode = 0644,
1102 .proc_handler = perf_proc_update_handler,
1103 .extra1 = &one,
1104 },
1105 {
1106 .procname = "perf_cpu_time_max_percent",
1107 .data = &sysctl_perf_cpu_time_max_percent,
1108 .maxlen = sizeof(sysctl_perf_cpu_time_max_percent),
1109 .mode = 0644,
1110 .proc_handler = perf_cpu_time_max_percent_handler,
1111 .extra1 = &zero,
1112 .extra2 = &one_hundred,
1113 },
1114 #endif
1115 #ifdef CONFIG_KMEMCHECK
1116 {
1117 .procname = "kmemcheck",
1118 .data = &kmemcheck_enabled,
1119 .maxlen = sizeof(int),
1120 .mode = 0644,
1121 .proc_handler = proc_dointvec,
1122 },
1123 #endif
1124 {
1125 .procname = "panic_on_warn",
1126 .data = &panic_on_warn,
1127 .maxlen = sizeof(int),
1128 .mode = 0644,
1129 .proc_handler = proc_dointvec_minmax,
1130 .extra1 = &zero,
1131 .extra2 = &one,
1132 },
1133 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON)
1134 {
1135 .procname = "timer_migration",
1136 .data = &sysctl_timer_migration,
1137 .maxlen = sizeof(unsigned int),
1138 .mode = 0644,
1139 .proc_handler = timer_migration_handler,
1140 },
1141 #endif
1142 { }
1143 };
1144
1145 static struct ctl_table vm_table[] = {
1146 {
1147 .procname = "overcommit_memory",
1148 .data = &sysctl_overcommit_memory,
1149 .maxlen = sizeof(sysctl_overcommit_memory),
1150 .mode = 0644,
1151 .proc_handler = proc_dointvec_minmax,
1152 .extra1 = &zero,
1153 .extra2 = &two,
1154 },
1155 {
1156 .procname = "panic_on_oom",
1157 .data = &sysctl_panic_on_oom,
1158 .maxlen = sizeof(sysctl_panic_on_oom),
1159 .mode = 0644,
1160 .proc_handler = proc_dointvec_minmax,
1161 .extra1 = &zero,
1162 .extra2 = &two,
1163 },
1164 {
1165 .procname = "oom_kill_allocating_task",
1166 .data = &sysctl_oom_kill_allocating_task,
1167 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
1168 .mode = 0644,
1169 .proc_handler = proc_dointvec,
1170 },
1171 {
1172 .procname = "oom_dump_tasks",
1173 .data = &sysctl_oom_dump_tasks,
1174 .maxlen = sizeof(sysctl_oom_dump_tasks),
1175 .mode = 0644,
1176 .proc_handler = proc_dointvec,
1177 },
1178 {
1179 .procname = "overcommit_ratio",
1180 .data = &sysctl_overcommit_ratio,
1181 .maxlen = sizeof(sysctl_overcommit_ratio),
1182 .mode = 0644,
1183 .proc_handler = overcommit_ratio_handler,
1184 },
1185 {
1186 .procname = "overcommit_kbytes",
1187 .data = &sysctl_overcommit_kbytes,
1188 .maxlen = sizeof(sysctl_overcommit_kbytes),
1189 .mode = 0644,
1190 .proc_handler = overcommit_kbytes_handler,
1191 },
1192 {
1193 .procname = "page-cluster",
1194 .data = &page_cluster,
1195 .maxlen = sizeof(int),
1196 .mode = 0644,
1197 .proc_handler = proc_dointvec_minmax,
1198 .extra1 = &zero,
1199 },
1200 {
1201 .procname = "dirty_background_ratio",
1202 .data = &dirty_background_ratio,
1203 .maxlen = sizeof(dirty_background_ratio),
1204 .mode = 0644,
1205 .proc_handler = dirty_background_ratio_handler,
1206 .extra1 = &zero,
1207 .extra2 = &one_hundred,
1208 },
1209 {
1210 .procname = "dirty_background_bytes",
1211 .data = &dirty_background_bytes,
1212 .maxlen = sizeof(dirty_background_bytes),
1213 .mode = 0644,
1214 .proc_handler = dirty_background_bytes_handler,
1215 .extra1 = &one_ul,
1216 },
1217 {
1218 .procname = "dirty_ratio",
1219 .data = &vm_dirty_ratio,
1220 .maxlen = sizeof(vm_dirty_ratio),
1221 .mode = 0644,
1222 .proc_handler = dirty_ratio_handler,
1223 .extra1 = &zero,
1224 .extra2 = &one_hundred,
1225 },
1226 {
1227 .procname = "dirty_bytes",
1228 .data = &vm_dirty_bytes,
1229 .maxlen = sizeof(vm_dirty_bytes),
1230 .mode = 0644,
1231 .proc_handler = dirty_bytes_handler,
1232 .extra1 = &dirty_bytes_min,
1233 },
1234 {
1235 .procname = "dirty_writeback_centisecs",
1236 .data = &dirty_writeback_interval,
1237 .maxlen = sizeof(dirty_writeback_interval),
1238 .mode = 0644,
1239 .proc_handler = dirty_writeback_centisecs_handler,
1240 },
1241 {
1242 .procname = "dirty_expire_centisecs",
1243 .data = &dirty_expire_interval,
1244 .maxlen = sizeof(dirty_expire_interval),
1245 .mode = 0644,
1246 .proc_handler = proc_dointvec_minmax,
1247 .extra1 = &zero,
1248 },
1249 {
1250 .procname = "dirtytime_expire_seconds",
1251 .data = &dirtytime_expire_interval,
1252 .maxlen = sizeof(dirty_expire_interval),
1253 .mode = 0644,
1254 .proc_handler = dirtytime_interval_handler,
1255 .extra1 = &zero,
1256 },
1257 {
1258 .procname = "nr_pdflush_threads",
1259 .mode = 0444 /* read-only */,
1260 .proc_handler = pdflush_proc_obsolete,
1261 },
1262 {
1263 .procname = "swappiness",
1264 .data = &vm_swappiness,
1265 .maxlen = sizeof(vm_swappiness),
1266 .mode = 0644,
1267 .proc_handler = proc_dointvec_minmax,
1268 .extra1 = &zero,
1269 .extra2 = &one_hundred,
1270 },
1271 #ifdef CONFIG_HUGETLB_PAGE
1272 {
1273 .procname = "nr_hugepages",
1274 .data = NULL,
1275 .maxlen = sizeof(unsigned long),
1276 .mode = 0644,
1277 .proc_handler = hugetlb_sysctl_handler,
1278 },
1279 #ifdef CONFIG_NUMA
1280 {
1281 .procname = "nr_hugepages_mempolicy",
1282 .data = NULL,
1283 .maxlen = sizeof(unsigned long),
1284 .mode = 0644,
1285 .proc_handler = &hugetlb_mempolicy_sysctl_handler,
1286 },
1287 #endif
1288 {
1289 .procname = "hugetlb_shm_group",
1290 .data = &sysctl_hugetlb_shm_group,
1291 .maxlen = sizeof(gid_t),
1292 .mode = 0644,
1293 .proc_handler = proc_dointvec,
1294 },
1295 {
1296 .procname = "hugepages_treat_as_movable",
1297 .data = &hugepages_treat_as_movable,
1298 .maxlen = sizeof(int),
1299 .mode = 0644,
1300 .proc_handler = proc_dointvec,
1301 },
1302 {
1303 .procname = "nr_overcommit_hugepages",
1304 .data = NULL,
1305 .maxlen = sizeof(unsigned long),
1306 .mode = 0644,
1307 .proc_handler = hugetlb_overcommit_handler,
1308 },
1309 #endif
1310 {
1311 .procname = "lowmem_reserve_ratio",
1312 .data = &sysctl_lowmem_reserve_ratio,
1313 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1314 .mode = 0644,
1315 .proc_handler = lowmem_reserve_ratio_sysctl_handler,
1316 },
1317 {
1318 .procname = "drop_caches",
1319 .data = &sysctl_drop_caches,
1320 .maxlen = sizeof(int),
1321 .mode = 0644,
1322 .proc_handler = drop_caches_sysctl_handler,
1323 .extra1 = &one,
1324 .extra2 = &four,
1325 },
1326 #ifdef CONFIG_COMPACTION
1327 {
1328 .procname = "compact_memory",
1329 .data = &sysctl_compact_memory,
1330 .maxlen = sizeof(int),
1331 .mode = 0200,
1332 .proc_handler = sysctl_compaction_handler,
1333 },
1334 {
1335 .procname = "extfrag_threshold",
1336 .data = &sysctl_extfrag_threshold,
1337 .maxlen = sizeof(int),
1338 .mode = 0644,
1339 .proc_handler = sysctl_extfrag_handler,
1340 .extra1 = &min_extfrag_threshold,
1341 .extra2 = &max_extfrag_threshold,
1342 },
1343 {
1344 .procname = "compact_unevictable_allowed",
1345 .data = &sysctl_compact_unevictable_allowed,
1346 .maxlen = sizeof(int),
1347 .mode = 0644,
1348 .proc_handler = proc_dointvec,
1349 .extra1 = &zero,
1350 .extra2 = &one,
1351 },
1352
1353 #endif /* CONFIG_COMPACTION */
1354 {
1355 .procname = "min_free_kbytes",
1356 .data = &min_free_kbytes,
1357 .maxlen = sizeof(min_free_kbytes),
1358 .mode = 0644,
1359 .proc_handler = min_free_kbytes_sysctl_handler,
1360 .extra1 = &zero,
1361 },
1362 {
1363 .procname = "percpu_pagelist_fraction",
1364 .data = &percpu_pagelist_fraction,
1365 .maxlen = sizeof(percpu_pagelist_fraction),
1366 .mode = 0644,
1367 .proc_handler = percpu_pagelist_fraction_sysctl_handler,
1368 .extra1 = &zero,
1369 },
1370 #ifdef CONFIG_MMU
1371 {
1372 .procname = "max_map_count",
1373 .data = &sysctl_max_map_count,
1374 .maxlen = sizeof(sysctl_max_map_count),
1375 .mode = 0644,
1376 .proc_handler = proc_dointvec_minmax,
1377 .extra1 = &zero,
1378 },
1379 #else
1380 {
1381 .procname = "nr_trim_pages",
1382 .data = &sysctl_nr_trim_pages,
1383 .maxlen = sizeof(sysctl_nr_trim_pages),
1384 .mode = 0644,
1385 .proc_handler = proc_dointvec_minmax,
1386 .extra1 = &zero,
1387 },
1388 #endif
1389 {
1390 .procname = "laptop_mode",
1391 .data = &laptop_mode,
1392 .maxlen = sizeof(laptop_mode),
1393 .mode = 0644,
1394 .proc_handler = proc_dointvec_jiffies,
1395 },
1396 {
1397 .procname = "block_dump",
1398 .data = &block_dump,
1399 .maxlen = sizeof(block_dump),
1400 .mode = 0644,
1401 .proc_handler = proc_dointvec,
1402 .extra1 = &zero,
1403 },
1404 {
1405 .procname = "vfs_cache_pressure",
1406 .data = &sysctl_vfs_cache_pressure,
1407 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1408 .mode = 0644,
1409 .proc_handler = proc_dointvec,
1410 .extra1 = &zero,
1411 },
1412 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1413 {
1414 .procname = "legacy_va_layout",
1415 .data = &sysctl_legacy_va_layout,
1416 .maxlen = sizeof(sysctl_legacy_va_layout),
1417 .mode = 0644,
1418 .proc_handler = proc_dointvec,
1419 .extra1 = &zero,
1420 },
1421 #endif
1422 #ifdef CONFIG_NUMA
1423 {
1424 .procname = "zone_reclaim_mode",
1425 .data = &zone_reclaim_mode,
1426 .maxlen = sizeof(zone_reclaim_mode),
1427 .mode = 0644,
1428 .proc_handler = proc_dointvec,
1429 .extra1 = &zero,
1430 },
1431 {
1432 .procname = "min_unmapped_ratio",
1433 .data = &sysctl_min_unmapped_ratio,
1434 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1435 .mode = 0644,
1436 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler,
1437 .extra1 = &zero,
1438 .extra2 = &one_hundred,
1439 },
1440 {
1441 .procname = "min_slab_ratio",
1442 .data = &sysctl_min_slab_ratio,
1443 .maxlen = sizeof(sysctl_min_slab_ratio),
1444 .mode = 0644,
1445 .proc_handler = sysctl_min_slab_ratio_sysctl_handler,
1446 .extra1 = &zero,
1447 .extra2 = &one_hundred,
1448 },
1449 #endif
1450 #ifdef CONFIG_SMP
1451 {
1452 .procname = "stat_interval",
1453 .data = &sysctl_stat_interval,
1454 .maxlen = sizeof(sysctl_stat_interval),
1455 .mode = 0644,
1456 .proc_handler = proc_dointvec_jiffies,
1457 },
1458 #endif
1459 #ifdef CONFIG_MMU
1460 {
1461 .procname = "mmap_min_addr",
1462 .data = &dac_mmap_min_addr,
1463 .maxlen = sizeof(unsigned long),
1464 .mode = 0644,
1465 .proc_handler = mmap_min_addr_handler,
1466 },
1467 #endif
1468 #ifdef CONFIG_NUMA
1469 {
1470 .procname = "numa_zonelist_order",
1471 .data = &numa_zonelist_order,
1472 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1473 .mode = 0644,
1474 .proc_handler = numa_zonelist_order_handler,
1475 },
1476 #endif
1477 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1478 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1479 {
1480 .procname = "vdso_enabled",
1481 #ifdef CONFIG_X86_32
1482 .data = &vdso32_enabled,
1483 .maxlen = sizeof(vdso32_enabled),
1484 #else
1485 .data = &vdso_enabled,
1486 .maxlen = sizeof(vdso_enabled),
1487 #endif
1488 .mode = 0644,
1489 .proc_handler = proc_dointvec,
1490 .extra1 = &zero,
1491 },
1492 #endif
1493 #ifdef CONFIG_HIGHMEM
1494 {
1495 .procname = "highmem_is_dirtyable",
1496 .data = &vm_highmem_is_dirtyable,
1497 .maxlen = sizeof(vm_highmem_is_dirtyable),
1498 .mode = 0644,
1499 .proc_handler = proc_dointvec_minmax,
1500 .extra1 = &zero,
1501 .extra2 = &one,
1502 },
1503 #endif
1504 #ifdef CONFIG_MEMORY_FAILURE
1505 {
1506 .procname = "memory_failure_early_kill",
1507 .data = &sysctl_memory_failure_early_kill,
1508 .maxlen = sizeof(sysctl_memory_failure_early_kill),
1509 .mode = 0644,
1510 .proc_handler = proc_dointvec_minmax,
1511 .extra1 = &zero,
1512 .extra2 = &one,
1513 },
1514 {
1515 .procname = "memory_failure_recovery",
1516 .data = &sysctl_memory_failure_recovery,
1517 .maxlen = sizeof(sysctl_memory_failure_recovery),
1518 .mode = 0644,
1519 .proc_handler = proc_dointvec_minmax,
1520 .extra1 = &zero,
1521 .extra2 = &one,
1522 },
1523 #endif
1524 {
1525 .procname = "user_reserve_kbytes",
1526 .data = &sysctl_user_reserve_kbytes,
1527 .maxlen = sizeof(sysctl_user_reserve_kbytes),
1528 .mode = 0644,
1529 .proc_handler = proc_doulongvec_minmax,
1530 },
1531 {
1532 .procname = "admin_reserve_kbytes",
1533 .data = &sysctl_admin_reserve_kbytes,
1534 .maxlen = sizeof(sysctl_admin_reserve_kbytes),
1535 .mode = 0644,
1536 .proc_handler = proc_doulongvec_minmax,
1537 },
1538 { }
1539 };
1540
1541 static struct ctl_table fs_table[] = {
1542 {
1543 .procname = "inode-nr",
1544 .data = &inodes_stat,
1545 .maxlen = 2*sizeof(long),
1546 .mode = 0444,
1547 .proc_handler = proc_nr_inodes,
1548 },
1549 {
1550 .procname = "inode-state",
1551 .data = &inodes_stat,
1552 .maxlen = 7*sizeof(long),
1553 .mode = 0444,
1554 .proc_handler = proc_nr_inodes,
1555 },
1556 {
1557 .procname = "file-nr",
1558 .data = &files_stat,
1559 .maxlen = sizeof(files_stat),
1560 .mode = 0444,
1561 .proc_handler = proc_nr_files,
1562 },
1563 {
1564 .procname = "file-max",
1565 .data = &files_stat.max_files,
1566 .maxlen = sizeof(files_stat.max_files),
1567 .mode = 0644,
1568 .proc_handler = proc_doulongvec_minmax,
1569 },
1570 {
1571 .procname = "nr_open",
1572 .data = &sysctl_nr_open,
1573 .maxlen = sizeof(int),
1574 .mode = 0644,
1575 .proc_handler = proc_dointvec_minmax,
1576 .extra1 = &sysctl_nr_open_min,
1577 .extra2 = &sysctl_nr_open_max,
1578 },
1579 {
1580 .procname = "dentry-state",
1581 .data = &dentry_stat,
1582 .maxlen = 6*sizeof(long),
1583 .mode = 0444,
1584 .proc_handler = proc_nr_dentry,
1585 },
1586 {
1587 .procname = "overflowuid",
1588 .data = &fs_overflowuid,
1589 .maxlen = sizeof(int),
1590 .mode = 0644,
1591 .proc_handler = proc_dointvec_minmax,
1592 .extra1 = &minolduid,
1593 .extra2 = &maxolduid,
1594 },
1595 {
1596 .procname = "overflowgid",
1597 .data = &fs_overflowgid,
1598 .maxlen = sizeof(int),
1599 .mode = 0644,
1600 .proc_handler = proc_dointvec_minmax,
1601 .extra1 = &minolduid,
1602 .extra2 = &maxolduid,
1603 },
1604 #ifdef CONFIG_FILE_LOCKING
1605 {
1606 .procname = "leases-enable",
1607 .data = &leases_enable,
1608 .maxlen = sizeof(int),
1609 .mode = 0644,
1610 .proc_handler = proc_dointvec,
1611 },
1612 #endif
1613 #ifdef CONFIG_DNOTIFY
1614 {
1615 .procname = "dir-notify-enable",
1616 .data = &dir_notify_enable,
1617 .maxlen = sizeof(int),
1618 .mode = 0644,
1619 .proc_handler = proc_dointvec,
1620 },
1621 #endif
1622 #ifdef CONFIG_MMU
1623 #ifdef CONFIG_FILE_LOCKING
1624 {
1625 .procname = "lease-break-time",
1626 .data = &lease_break_time,
1627 .maxlen = sizeof(int),
1628 .mode = 0644,
1629 .proc_handler = proc_dointvec,
1630 },
1631 #endif
1632 #ifdef CONFIG_AIO
1633 {
1634 .procname = "aio-nr",
1635 .data = &aio_nr,
1636 .maxlen = sizeof(aio_nr),
1637 .mode = 0444,
1638 .proc_handler = proc_doulongvec_minmax,
1639 },
1640 {
1641 .procname = "aio-max-nr",
1642 .data = &aio_max_nr,
1643 .maxlen = sizeof(aio_max_nr),
1644 .mode = 0644,
1645 .proc_handler = proc_doulongvec_minmax,
1646 },
1647 #endif /* CONFIG_AIO */
1648 #ifdef CONFIG_INOTIFY_USER
1649 {
1650 .procname = "inotify",
1651 .mode = 0555,
1652 .child = inotify_table,
1653 },
1654 #endif
1655 #ifdef CONFIG_EPOLL
1656 {
1657 .procname = "epoll",
1658 .mode = 0555,
1659 .child = epoll_table,
1660 },
1661 #endif
1662 #endif
1663 {
1664 .procname = "protected_symlinks",
1665 .data = &sysctl_protected_symlinks,
1666 .maxlen = sizeof(int),
1667 .mode = 0600,
1668 .proc_handler = proc_dointvec_minmax,
1669 .extra1 = &zero,
1670 .extra2 = &one,
1671 },
1672 {
1673 .procname = "protected_hardlinks",
1674 .data = &sysctl_protected_hardlinks,
1675 .maxlen = sizeof(int),
1676 .mode = 0600,
1677 .proc_handler = proc_dointvec_minmax,
1678 .extra1 = &zero,
1679 .extra2 = &one,
1680 },
1681 {
1682 .procname = "suid_dumpable",
1683 .data = &suid_dumpable,
1684 .maxlen = sizeof(int),
1685 .mode = 0644,
1686 .proc_handler = proc_dointvec_minmax_coredump,
1687 .extra1 = &zero,
1688 .extra2 = &two,
1689 },
1690 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1691 {
1692 .procname = "binfmt_misc",
1693 .mode = 0555,
1694 .child = sysctl_mount_point,
1695 },
1696 #endif
1697 {
1698 .procname = "pipe-max-size",
1699 .data = &pipe_max_size,
1700 .maxlen = sizeof(int),
1701 .mode = 0644,
1702 .proc_handler = &pipe_proc_fn,
1703 .extra1 = &pipe_min_size,
1704 },
1705 { }
1706 };
1707
1708 static struct ctl_table debug_table[] = {
1709 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
1710 {
1711 .procname = "exception-trace",
1712 .data = &show_unhandled_signals,
1713 .maxlen = sizeof(int),
1714 .mode = 0644,
1715 .proc_handler = proc_dointvec
1716 },
1717 #endif
1718 #if defined(CONFIG_OPTPROBES)
1719 {
1720 .procname = "kprobes-optimization",
1721 .data = &sysctl_kprobes_optimization,
1722 .maxlen = sizeof(int),
1723 .mode = 0644,
1724 .proc_handler = proc_kprobes_optimization_handler,
1725 .extra1 = &zero,
1726 .extra2 = &one,
1727 },
1728 #endif
1729 { }
1730 };
1731
1732 static struct ctl_table dev_table[] = {
1733 { }
1734 };
1735
1736 int __init sysctl_init(void)
1737 {
1738 struct ctl_table_header *hdr;
1739
1740 hdr = register_sysctl_table(sysctl_base_table);
1741 kmemleak_not_leak(hdr);
1742 return 0;
1743 }
1744
1745 #endif /* CONFIG_SYSCTL */
1746
1747 /*
1748 * /proc/sys support
1749 */
1750
1751 #ifdef CONFIG_PROC_SYSCTL
1752
1753 static int _proc_do_string(char *data, int maxlen, int write,
1754 char __user *buffer,
1755 size_t *lenp, loff_t *ppos)
1756 {
1757 size_t len;
1758 char __user *p;
1759 char c;
1760
1761 if (!data || !maxlen || !*lenp) {
1762 *lenp = 0;
1763 return 0;
1764 }
1765
1766 if (write) {
1767 if (sysctl_writes_strict == SYSCTL_WRITES_STRICT) {
1768 /* Only continue writes not past the end of buffer. */
1769 len = strlen(data);
1770 if (len > maxlen - 1)
1771 len = maxlen - 1;
1772
1773 if (*ppos > len)
1774 return 0;
1775 len = *ppos;
1776 } else {
1777 /* Start writing from beginning of buffer. */
1778 len = 0;
1779 }
1780
1781 *ppos += *lenp;
1782 p = buffer;
1783 while ((p - buffer) < *lenp && len < maxlen - 1) {
1784 if (get_user(c, p++))
1785 return -EFAULT;
1786 if (c == 0 || c == '\n')
1787 break;
1788 data[len++] = c;
1789 }
1790 data[len] = 0;
1791 } else {
1792 len = strlen(data);
1793 if (len > maxlen)
1794 len = maxlen;
1795
1796 if (*ppos > len) {
1797 *lenp = 0;
1798 return 0;
1799 }
1800
1801 data += *ppos;
1802 len -= *ppos;
1803
1804 if (len > *lenp)
1805 len = *lenp;
1806 if (len)
1807 if (copy_to_user(buffer, data, len))
1808 return -EFAULT;
1809 if (len < *lenp) {
1810 if (put_user('\n', buffer + len))
1811 return -EFAULT;
1812 len++;
1813 }
1814 *lenp = len;
1815 *ppos += len;
1816 }
1817 return 0;
1818 }
1819
1820 static void warn_sysctl_write(struct ctl_table *table)
1821 {
1822 pr_warn_once("%s wrote to %s when file position was not 0!\n"
1823 "This will not be supported in the future. To silence this\n"
1824 "warning, set kernel.sysctl_writes_strict = -1\n",
1825 current->comm, table->procname);
1826 }
1827
1828 /**
1829 * proc_dostring - read a string sysctl
1830 * @table: the sysctl table
1831 * @write: %TRUE if this is a write to the sysctl file
1832 * @buffer: the user buffer
1833 * @lenp: the size of the user buffer
1834 * @ppos: file position
1835 *
1836 * Reads/writes a string from/to the user buffer. If the kernel
1837 * buffer provided is not large enough to hold the string, the
1838 * string is truncated. The copied string is %NULL-terminated.
1839 * If the string is being read by the user process, it is copied
1840 * and a newline '\n' is added. It is truncated if the buffer is
1841 * not large enough.
1842 *
1843 * Returns 0 on success.
1844 */
1845 int proc_dostring(struct ctl_table *table, int write,
1846 void __user *buffer, size_t *lenp, loff_t *ppos)
1847 {
1848 if (write && *ppos && sysctl_writes_strict == SYSCTL_WRITES_WARN)
1849 warn_sysctl_write(table);
1850
1851 return _proc_do_string((char *)(table->data), table->maxlen, write,
1852 (char __user *)buffer, lenp, ppos);
1853 }
1854
1855 static size_t proc_skip_spaces(char **buf)
1856 {
1857 size_t ret;
1858 char *tmp = skip_spaces(*buf);
1859 ret = tmp - *buf;
1860 *buf = tmp;
1861 return ret;
1862 }
1863
1864 static void proc_skip_char(char **buf, size_t *size, const char v)
1865 {
1866 while (*size) {
1867 if (**buf != v)
1868 break;
1869 (*size)--;
1870 (*buf)++;
1871 }
1872 }
1873
1874 #define TMPBUFLEN 22
1875 /**
1876 * proc_get_long - reads an ASCII formatted integer from a user buffer
1877 *
1878 * @buf: a kernel buffer
1879 * @size: size of the kernel buffer
1880 * @val: this is where the number will be stored
1881 * @neg: set to %TRUE if number is negative
1882 * @perm_tr: a vector which contains the allowed trailers
1883 * @perm_tr_len: size of the perm_tr vector
1884 * @tr: pointer to store the trailer character
1885 *
1886 * In case of success %0 is returned and @buf and @size are updated with
1887 * the amount of bytes read. If @tr is non-NULL and a trailing
1888 * character exists (size is non-zero after returning from this
1889 * function), @tr is updated with the trailing character.
1890 */
1891 static int proc_get_long(char **buf, size_t *size,
1892 unsigned long *val, bool *neg,
1893 const char *perm_tr, unsigned perm_tr_len, char *tr)
1894 {
1895 int len;
1896 char *p, tmp[TMPBUFLEN];
1897
1898 if (!*size)
1899 return -EINVAL;
1900
1901 len = *size;
1902 if (len > TMPBUFLEN - 1)
1903 len = TMPBUFLEN - 1;
1904
1905 memcpy(tmp, *buf, len);
1906
1907 tmp[len] = 0;
1908 p = tmp;
1909 if (*p == '-' && *size > 1) {
1910 *neg = true;
1911 p++;
1912 } else
1913 *neg = false;
1914 if (!isdigit(*p))
1915 return -EINVAL;
1916
1917 *val = simple_strtoul(p, &p, 0);
1918
1919 len = p - tmp;
1920
1921 /* We don't know if the next char is whitespace thus we may accept
1922 * invalid integers (e.g. 1234...a) or two integers instead of one
1923 * (e.g. 123...1). So lets not allow such large numbers. */
1924 if (len == TMPBUFLEN - 1)
1925 return -EINVAL;
1926
1927 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
1928 return -EINVAL;
1929
1930 if (tr && (len < *size))
1931 *tr = *p;
1932
1933 *buf += len;
1934 *size -= len;
1935
1936 return 0;
1937 }
1938
1939 /**
1940 * proc_put_long - converts an integer to a decimal ASCII formatted string
1941 *
1942 * @buf: the user buffer
1943 * @size: the size of the user buffer
1944 * @val: the integer to be converted
1945 * @neg: sign of the number, %TRUE for negative
1946 *
1947 * In case of success %0 is returned and @buf and @size are updated with
1948 * the amount of bytes written.
1949 */
1950 static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
1951 bool neg)
1952 {
1953 int len;
1954 char tmp[TMPBUFLEN], *p = tmp;
1955
1956 sprintf(p, "%s%lu", neg ? "-" : "", val);
1957 len = strlen(tmp);
1958 if (len > *size)
1959 len = *size;
1960 if (copy_to_user(*buf, tmp, len))
1961 return -EFAULT;
1962 *size -= len;
1963 *buf += len;
1964 return 0;
1965 }
1966 #undef TMPBUFLEN
1967
1968 static int proc_put_char(void __user **buf, size_t *size, char c)
1969 {
1970 if (*size) {
1971 char __user **buffer = (char __user **)buf;
1972 if (put_user(c, *buffer))
1973 return -EFAULT;
1974 (*size)--, (*buffer)++;
1975 *buf = *buffer;
1976 }
1977 return 0;
1978 }
1979
1980 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
1981 int *valp,
1982 int write, void *data)
1983 {
1984 if (write) {
1985 if (*negp) {
1986 if (*lvalp > (unsigned long) INT_MAX + 1)
1987 return -EINVAL;
1988 *valp = -*lvalp;
1989 } else {
1990 if (*lvalp > (unsigned long) INT_MAX)
1991 return -EINVAL;
1992 *valp = *lvalp;
1993 }
1994 } else {
1995 int val = *valp;
1996 if (val < 0) {
1997 *negp = true;
1998 *lvalp = (unsigned long)-val;
1999 } else {
2000 *negp = false;
2001 *lvalp = (unsigned long)val;
2002 }
2003 }
2004 return 0;
2005 }
2006
2007 static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
2008
2009 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
2010 int write, void __user *buffer,
2011 size_t *lenp, loff_t *ppos,
2012 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2013 int write, void *data),
2014 void *data)
2015 {
2016 int *i, vleft, first = 1, err = 0;
2017 unsigned long page = 0;
2018 size_t left;
2019 char *kbuf;
2020
2021 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
2022 *lenp = 0;
2023 return 0;
2024 }
2025
2026 i = (int *) tbl_data;
2027 vleft = table->maxlen / sizeof(*i);
2028 left = *lenp;
2029
2030 if (!conv)
2031 conv = do_proc_dointvec_conv;
2032
2033 if (write) {
2034 if (*ppos) {
2035 switch (sysctl_writes_strict) {
2036 case SYSCTL_WRITES_STRICT:
2037 goto out;
2038 case SYSCTL_WRITES_WARN:
2039 warn_sysctl_write(table);
2040 break;
2041 default:
2042 break;
2043 }
2044 }
2045
2046 if (left > PAGE_SIZE - 1)
2047 left = PAGE_SIZE - 1;
2048 page = __get_free_page(GFP_TEMPORARY);
2049 kbuf = (char *) page;
2050 if (!kbuf)
2051 return -ENOMEM;
2052 if (copy_from_user(kbuf, buffer, left)) {
2053 err = -EFAULT;
2054 goto free;
2055 }
2056 kbuf[left] = 0;
2057 }
2058
2059 for (; left && vleft--; i++, first=0) {
2060 unsigned long lval;
2061 bool neg;
2062
2063 if (write) {
2064 left -= proc_skip_spaces(&kbuf);
2065
2066 if (!left)
2067 break;
2068 err = proc_get_long(&kbuf, &left, &lval, &neg,
2069 proc_wspace_sep,
2070 sizeof(proc_wspace_sep), NULL);
2071 if (err)
2072 break;
2073 if (conv(&neg, &lval, i, 1, data)) {
2074 err = -EINVAL;
2075 break;
2076 }
2077 } else {
2078 if (conv(&neg, &lval, i, 0, data)) {
2079 err = -EINVAL;
2080 break;
2081 }
2082 if (!first)
2083 err = proc_put_char(&buffer, &left, '\t');
2084 if (err)
2085 break;
2086 err = proc_put_long(&buffer, &left, lval, neg);
2087 if (err)
2088 break;
2089 }
2090 }
2091
2092 if (!write && !first && left && !err)
2093 err = proc_put_char(&buffer, &left, '\n');
2094 if (write && !err && left)
2095 left -= proc_skip_spaces(&kbuf);
2096 free:
2097 if (write) {
2098 free_page(page);
2099 if (first)
2100 return err ? : -EINVAL;
2101 }
2102 *lenp -= left;
2103 out:
2104 *ppos += *lenp;
2105 return err;
2106 }
2107
2108 static int do_proc_dointvec(struct ctl_table *table, int write,
2109 void __user *buffer, size_t *lenp, loff_t *ppos,
2110 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2111 int write, void *data),
2112 void *data)
2113 {
2114 return __do_proc_dointvec(table->data, table, write,
2115 buffer, lenp, ppos, conv, data);
2116 }
2117
2118 /**
2119 * proc_dointvec - read a vector of integers
2120 * @table: the sysctl table
2121 * @write: %TRUE if this is a write to the sysctl file
2122 * @buffer: the user buffer
2123 * @lenp: the size of the user buffer
2124 * @ppos: file position
2125 *
2126 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2127 * values from/to the user buffer, treated as an ASCII string.
2128 *
2129 * Returns 0 on success.
2130 */
2131 int proc_dointvec(struct ctl_table *table, int write,
2132 void __user *buffer, size_t *lenp, loff_t *ppos)
2133 {
2134 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2135 NULL,NULL);
2136 }
2137
2138 /*
2139 * Taint values can only be increased
2140 * This means we can safely use a temporary.
2141 */
2142 static int proc_taint(struct ctl_table *table, int write,
2143 void __user *buffer, size_t *lenp, loff_t *ppos)
2144 {
2145 struct ctl_table t;
2146 unsigned long tmptaint = get_taint();
2147 int err;
2148
2149 if (write && !capable(CAP_SYS_ADMIN))
2150 return -EPERM;
2151
2152 t = *table;
2153 t.data = &tmptaint;
2154 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
2155 if (err < 0)
2156 return err;
2157
2158 if (write) {
2159 /*
2160 * Poor man's atomic or. Not worth adding a primitive
2161 * to everyone's atomic.h for this
2162 */
2163 int i;
2164 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2165 if ((tmptaint >> i) & 1)
2166 add_taint(i, LOCKDEP_STILL_OK);
2167 }
2168 }
2169
2170 return err;
2171 }
2172
2173 #ifdef CONFIG_PRINTK
2174 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
2175 void __user *buffer, size_t *lenp, loff_t *ppos)
2176 {
2177 if (write && !capable(CAP_SYS_ADMIN))
2178 return -EPERM;
2179
2180 return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2181 }
2182 #endif
2183
2184 struct do_proc_dointvec_minmax_conv_param {
2185 int *min;
2186 int *max;
2187 };
2188
2189 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
2190 int *valp,
2191 int write, void *data)
2192 {
2193 struct do_proc_dointvec_minmax_conv_param *param = data;
2194 if (write) {
2195 int val = *negp ? -*lvalp : *lvalp;
2196 if ((param->min && *param->min > val) ||
2197 (param->max && *param->max < val))
2198 return -EINVAL;
2199 *valp = val;
2200 } else {
2201 int val = *valp;
2202 if (val < 0) {
2203 *negp = true;
2204 *lvalp = (unsigned long)-val;
2205 } else {
2206 *negp = false;
2207 *lvalp = (unsigned long)val;
2208 }
2209 }
2210 return 0;
2211 }
2212
2213 /**
2214 * proc_dointvec_minmax - read a vector of integers with min/max values
2215 * @table: the sysctl table
2216 * @write: %TRUE if this is a write to the sysctl file
2217 * @buffer: the user buffer
2218 * @lenp: the size of the user buffer
2219 * @ppos: file position
2220 *
2221 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2222 * values from/to the user buffer, treated as an ASCII string.
2223 *
2224 * This routine will ensure the values are within the range specified by
2225 * table->extra1 (min) and table->extra2 (max).
2226 *
2227 * Returns 0 on success.
2228 */
2229 int proc_dointvec_minmax(struct ctl_table *table, int write,
2230 void __user *buffer, size_t *lenp, loff_t *ppos)
2231 {
2232 struct do_proc_dointvec_minmax_conv_param param = {
2233 .min = (int *) table->extra1,
2234 .max = (int *) table->extra2,
2235 };
2236 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2237 do_proc_dointvec_minmax_conv, &param);
2238 }
2239
2240 static void validate_coredump_safety(void)
2241 {
2242 #ifdef CONFIG_COREDUMP
2243 if (suid_dumpable == SUID_DUMP_ROOT &&
2244 core_pattern[0] != '/' && core_pattern[0] != '|') {
2245 printk(KERN_WARNING "Unsafe core_pattern used with "\
2246 "suid_dumpable=2. Pipe handler or fully qualified "\
2247 "core dump path required.\n");
2248 }
2249 #endif
2250 }
2251
2252 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
2253 void __user *buffer, size_t *lenp, loff_t *ppos)
2254 {
2255 int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2256 if (!error)
2257 validate_coredump_safety();
2258 return error;
2259 }
2260
2261 #ifdef CONFIG_COREDUMP
2262 static int proc_dostring_coredump(struct ctl_table *table, int write,
2263 void __user *buffer, size_t *lenp, loff_t *ppos)
2264 {
2265 int error = proc_dostring(table, write, buffer, lenp, ppos);
2266 if (!error)
2267 validate_coredump_safety();
2268 return error;
2269 }
2270 #endif
2271
2272 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2273 void __user *buffer,
2274 size_t *lenp, loff_t *ppos,
2275 unsigned long convmul,
2276 unsigned long convdiv)
2277 {
2278 unsigned long *i, *min, *max;
2279 int vleft, first = 1, err = 0;
2280 unsigned long page = 0;
2281 size_t left;
2282 char *kbuf;
2283
2284 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
2285 *lenp = 0;
2286 return 0;
2287 }
2288
2289 i = (unsigned long *) data;
2290 min = (unsigned long *) table->extra1;
2291 max = (unsigned long *) table->extra2;
2292 vleft = table->maxlen / sizeof(unsigned long);
2293 left = *lenp;
2294
2295 if (write) {
2296 if (*ppos) {
2297 switch (sysctl_writes_strict) {
2298 case SYSCTL_WRITES_STRICT:
2299 goto out;
2300 case SYSCTL_WRITES_WARN:
2301 warn_sysctl_write(table);
2302 break;
2303 default:
2304 break;
2305 }
2306 }
2307
2308 if (left > PAGE_SIZE - 1)
2309 left = PAGE_SIZE - 1;
2310 page = __get_free_page(GFP_TEMPORARY);
2311 kbuf = (char *) page;
2312 if (!kbuf)
2313 return -ENOMEM;
2314 if (copy_from_user(kbuf, buffer, left)) {
2315 err = -EFAULT;
2316 goto free;
2317 }
2318 kbuf[left] = 0;
2319 }
2320
2321 for (; left && vleft--; i++, first = 0) {
2322 unsigned long val;
2323
2324 if (write) {
2325 bool neg;
2326
2327 left -= proc_skip_spaces(&kbuf);
2328
2329 err = proc_get_long(&kbuf, &left, &val, &neg,
2330 proc_wspace_sep,
2331 sizeof(proc_wspace_sep), NULL);
2332 if (err)
2333 break;
2334 if (neg)
2335 continue;
2336 if ((min && val < *min) || (max && val > *max))
2337 continue;
2338 *i = val;
2339 } else {
2340 val = convdiv * (*i) / convmul;
2341 if (!first) {
2342 err = proc_put_char(&buffer, &left, '\t');
2343 if (err)
2344 break;
2345 }
2346 err = proc_put_long(&buffer, &left, val, false);
2347 if (err)
2348 break;
2349 }
2350 }
2351
2352 if (!write && !first && left && !err)
2353 err = proc_put_char(&buffer, &left, '\n');
2354 if (write && !err)
2355 left -= proc_skip_spaces(&kbuf);
2356 free:
2357 if (write) {
2358 free_page(page);
2359 if (first)
2360 return err ? : -EINVAL;
2361 }
2362 *lenp -= left;
2363 out:
2364 *ppos += *lenp;
2365 return err;
2366 }
2367
2368 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2369 void __user *buffer,
2370 size_t *lenp, loff_t *ppos,
2371 unsigned long convmul,
2372 unsigned long convdiv)
2373 {
2374 return __do_proc_doulongvec_minmax(table->data, table, write,
2375 buffer, lenp, ppos, convmul, convdiv);
2376 }
2377
2378 /**
2379 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2380 * @table: the sysctl table
2381 * @write: %TRUE if this is a write to the sysctl file
2382 * @buffer: the user buffer
2383 * @lenp: the size of the user buffer
2384 * @ppos: file position
2385 *
2386 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2387 * values from/to the user buffer, treated as an ASCII string.
2388 *
2389 * This routine will ensure the values are within the range specified by
2390 * table->extra1 (min) and table->extra2 (max).
2391 *
2392 * Returns 0 on success.
2393 */
2394 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2395 void __user *buffer, size_t *lenp, loff_t *ppos)
2396 {
2397 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
2398 }
2399
2400 /**
2401 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2402 * @table: the sysctl table
2403 * @write: %TRUE if this is a write to the sysctl file
2404 * @buffer: the user buffer
2405 * @lenp: the size of the user buffer
2406 * @ppos: file position
2407 *
2408 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2409 * values from/to the user buffer, treated as an ASCII string. The values
2410 * are treated as milliseconds, and converted to jiffies when they are stored.
2411 *
2412 * This routine will ensure the values are within the range specified by
2413 * table->extra1 (min) and table->extra2 (max).
2414 *
2415 * Returns 0 on success.
2416 */
2417 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2418 void __user *buffer,
2419 size_t *lenp, loff_t *ppos)
2420 {
2421 return do_proc_doulongvec_minmax(table, write, buffer,
2422 lenp, ppos, HZ, 1000l);
2423 }
2424
2425
2426 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
2427 int *valp,
2428 int write, void *data)
2429 {
2430 if (write) {
2431 if (*lvalp > LONG_MAX / HZ)
2432 return 1;
2433 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2434 } else {
2435 int val = *valp;
2436 unsigned long lval;
2437 if (val < 0) {
2438 *negp = true;
2439 lval = (unsigned long)-val;
2440 } else {
2441 *negp = false;
2442 lval = (unsigned long)val;
2443 }
2444 *lvalp = lval / HZ;
2445 }
2446 return 0;
2447 }
2448
2449 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
2450 int *valp,
2451 int write, void *data)
2452 {
2453 if (write) {
2454 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2455 return 1;
2456 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2457 } else {
2458 int val = *valp;
2459 unsigned long lval;
2460 if (val < 0) {
2461 *negp = true;
2462 lval = (unsigned long)-val;
2463 } else {
2464 *negp = false;
2465 lval = (unsigned long)val;
2466 }
2467 *lvalp = jiffies_to_clock_t(lval);
2468 }
2469 return 0;
2470 }
2471
2472 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
2473 int *valp,
2474 int write, void *data)
2475 {
2476 if (write) {
2477 unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2478
2479 if (jif > INT_MAX)
2480 return 1;
2481 *valp = (int)jif;
2482 } else {
2483 int val = *valp;
2484 unsigned long lval;
2485 if (val < 0) {
2486 *negp = true;
2487 lval = (unsigned long)-val;
2488 } else {
2489 *negp = false;
2490 lval = (unsigned long)val;
2491 }
2492 *lvalp = jiffies_to_msecs(lval);
2493 }
2494 return 0;
2495 }
2496
2497 /**
2498 * proc_dointvec_jiffies - read a vector of integers as seconds
2499 * @table: the sysctl table
2500 * @write: %TRUE if this is a write to the sysctl file
2501 * @buffer: the user buffer
2502 * @lenp: the size of the user buffer
2503 * @ppos: file position
2504 *
2505 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2506 * values from/to the user buffer, treated as an ASCII string.
2507 * The values read are assumed to be in seconds, and are converted into
2508 * jiffies.
2509 *
2510 * Returns 0 on success.
2511 */
2512 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2513 void __user *buffer, size_t *lenp, loff_t *ppos)
2514 {
2515 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2516 do_proc_dointvec_jiffies_conv,NULL);
2517 }
2518
2519 /**
2520 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2521 * @table: the sysctl table
2522 * @write: %TRUE if this is a write to the sysctl file
2523 * @buffer: the user buffer
2524 * @lenp: the size of the user buffer
2525 * @ppos: pointer to the file position
2526 *
2527 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2528 * values from/to the user buffer, treated as an ASCII string.
2529 * The values read are assumed to be in 1/USER_HZ seconds, and
2530 * are converted into jiffies.
2531 *
2532 * Returns 0 on success.
2533 */
2534 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2535 void __user *buffer, size_t *lenp, loff_t *ppos)
2536 {
2537 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2538 do_proc_dointvec_userhz_jiffies_conv,NULL);
2539 }
2540
2541 /**
2542 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2543 * @table: the sysctl table
2544 * @write: %TRUE if this is a write to the sysctl file
2545 * @buffer: the user buffer
2546 * @lenp: the size of the user buffer
2547 * @ppos: file position
2548 * @ppos: the current position in the file
2549 *
2550 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2551 * values from/to the user buffer, treated as an ASCII string.
2552 * The values read are assumed to be in 1/1000 seconds, and
2553 * are converted into jiffies.
2554 *
2555 * Returns 0 on success.
2556 */
2557 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2558 void __user *buffer, size_t *lenp, loff_t *ppos)
2559 {
2560 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2561 do_proc_dointvec_ms_jiffies_conv, NULL);
2562 }
2563
2564 static int proc_do_cad_pid(struct ctl_table *table, int write,
2565 void __user *buffer, size_t *lenp, loff_t *ppos)
2566 {
2567 struct pid *new_pid;
2568 pid_t tmp;
2569 int r;
2570
2571 tmp = pid_vnr(cad_pid);
2572
2573 r = __do_proc_dointvec(&tmp, table, write, buffer,
2574 lenp, ppos, NULL, NULL);
2575 if (r || !write)
2576 return r;
2577
2578 new_pid = find_get_pid(tmp);
2579 if (!new_pid)
2580 return -ESRCH;
2581
2582 put_pid(xchg(&cad_pid, new_pid));
2583 return 0;
2584 }
2585
2586 /**
2587 * proc_do_large_bitmap - read/write from/to a large bitmap
2588 * @table: the sysctl table
2589 * @write: %TRUE if this is a write to the sysctl file
2590 * @buffer: the user buffer
2591 * @lenp: the size of the user buffer
2592 * @ppos: file position
2593 *
2594 * The bitmap is stored at table->data and the bitmap length (in bits)
2595 * in table->maxlen.
2596 *
2597 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2598 * large bitmaps may be represented in a compact manner. Writing into
2599 * the file will clear the bitmap then update it with the given input.
2600 *
2601 * Returns 0 on success.
2602 */
2603 int proc_do_large_bitmap(struct ctl_table *table, int write,
2604 void __user *buffer, size_t *lenp, loff_t *ppos)
2605 {
2606 int err = 0;
2607 bool first = 1;
2608 size_t left = *lenp;
2609 unsigned long bitmap_len = table->maxlen;
2610 unsigned long *bitmap = *(unsigned long **) table->data;
2611 unsigned long *tmp_bitmap = NULL;
2612 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
2613
2614 if (!bitmap || !bitmap_len || !left || (*ppos && !write)) {
2615 *lenp = 0;
2616 return 0;
2617 }
2618
2619 if (write) {
2620 unsigned long page = 0;
2621 char *kbuf;
2622
2623 if (left > PAGE_SIZE - 1)
2624 left = PAGE_SIZE - 1;
2625
2626 page = __get_free_page(GFP_TEMPORARY);
2627 kbuf = (char *) page;
2628 if (!kbuf)
2629 return -ENOMEM;
2630 if (copy_from_user(kbuf, buffer, left)) {
2631 free_page(page);
2632 return -EFAULT;
2633 }
2634 kbuf[left] = 0;
2635
2636 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long),
2637 GFP_KERNEL);
2638 if (!tmp_bitmap) {
2639 free_page(page);
2640 return -ENOMEM;
2641 }
2642 proc_skip_char(&kbuf, &left, '\n');
2643 while (!err && left) {
2644 unsigned long val_a, val_b;
2645 bool neg;
2646
2647 err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a,
2648 sizeof(tr_a), &c);
2649 if (err)
2650 break;
2651 if (val_a >= bitmap_len || neg) {
2652 err = -EINVAL;
2653 break;
2654 }
2655
2656 val_b = val_a;
2657 if (left) {
2658 kbuf++;
2659 left--;
2660 }
2661
2662 if (c == '-') {
2663 err = proc_get_long(&kbuf, &left, &val_b,
2664 &neg, tr_b, sizeof(tr_b),
2665 &c);
2666 if (err)
2667 break;
2668 if (val_b >= bitmap_len || neg ||
2669 val_a > val_b) {
2670 err = -EINVAL;
2671 break;
2672 }
2673 if (left) {
2674 kbuf++;
2675 left--;
2676 }
2677 }
2678
2679 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
2680 first = 0;
2681 proc_skip_char(&kbuf, &left, '\n');
2682 }
2683 free_page(page);
2684 } else {
2685 unsigned long bit_a, bit_b = 0;
2686
2687 while (left) {
2688 bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
2689 if (bit_a >= bitmap_len)
2690 break;
2691 bit_b = find_next_zero_bit(bitmap, bitmap_len,
2692 bit_a + 1) - 1;
2693
2694 if (!first) {
2695 err = proc_put_char(&buffer, &left, ',');
2696 if (err)
2697 break;
2698 }
2699 err = proc_put_long(&buffer, &left, bit_a, false);
2700 if (err)
2701 break;
2702 if (bit_a != bit_b) {
2703 err = proc_put_char(&buffer, &left, '-');
2704 if (err)
2705 break;
2706 err = proc_put_long(&buffer, &left, bit_b, false);
2707 if (err)
2708 break;
2709 }
2710
2711 first = 0; bit_b++;
2712 }
2713 if (!err)
2714 err = proc_put_char(&buffer, &left, '\n');
2715 }
2716
2717 if (!err) {
2718 if (write) {
2719 if (*ppos)
2720 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
2721 else
2722 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
2723 }
2724 kfree(tmp_bitmap);
2725 *lenp -= left;
2726 *ppos += *lenp;
2727 return 0;
2728 } else {
2729 kfree(tmp_bitmap);
2730 return err;
2731 }
2732 }
2733
2734 #else /* CONFIG_PROC_SYSCTL */
2735
2736 int proc_dostring(struct ctl_table *table, int write,
2737 void __user *buffer, size_t *lenp, loff_t *ppos)
2738 {
2739 return -ENOSYS;
2740 }
2741
2742 int proc_dointvec(struct ctl_table *table, int write,
2743 void __user *buffer, size_t *lenp, loff_t *ppos)
2744 {
2745 return -ENOSYS;
2746 }
2747
2748 int proc_dointvec_minmax(struct ctl_table *table, int write,
2749 void __user *buffer, size_t *lenp, loff_t *ppos)
2750 {
2751 return -ENOSYS;
2752 }
2753
2754 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2755 void __user *buffer, size_t *lenp, loff_t *ppos)
2756 {
2757 return -ENOSYS;
2758 }
2759
2760 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2761 void __user *buffer, size_t *lenp, loff_t *ppos)
2762 {
2763 return -ENOSYS;
2764 }
2765
2766 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2767 void __user *buffer, size_t *lenp, loff_t *ppos)
2768 {
2769 return -ENOSYS;
2770 }
2771
2772 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2773 void __user *buffer, size_t *lenp, loff_t *ppos)
2774 {
2775 return -ENOSYS;
2776 }
2777
2778 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2779 void __user *buffer,
2780 size_t *lenp, loff_t *ppos)
2781 {
2782 return -ENOSYS;
2783 }
2784
2785
2786 #endif /* CONFIG_PROC_SYSCTL */
2787
2788 /*
2789 * No sense putting this after each symbol definition, twice,
2790 * exception granted :-)
2791 */
2792 EXPORT_SYMBOL(proc_dointvec);
2793 EXPORT_SYMBOL(proc_dointvec_jiffies);
2794 EXPORT_SYMBOL(proc_dointvec_minmax);
2795 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2796 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2797 EXPORT_SYMBOL(proc_dostring);
2798 EXPORT_SYMBOL(proc_doulongvec_minmax);
2799 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
Linux kernel - Deliverables
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