projects / deliverable / linux.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
Merge branch 'hwmon-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jdelv...
[deliverable/linux.git] / kernel / sysctl.c
1 /*
2 * sysctl.c: General linux system control interface
3 *
4 * Begun 24 March 1995, Stephen Tweedie
5 * Added /proc support, Dec 1995
6 * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas.
7 * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver.
8 * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver.
9 * Dynamic registration fixes, Stephen Tweedie.
10 * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn.
11 * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris
12 * Horn.
13 * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer.
14 * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer.
15 * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill
16 * Wendling.
17 * The list_for_each() macro wasn't appropriate for the sysctl loop.
18 * Removed it and replaced it with older style, 03/23/00, Bill Wendling
19 */
20
21 #include <linux/module.h>
22 #include <linux/mm.h>
23 #include <linux/swap.h>
24 #include <linux/slab.h>
25 #include <linux/sysctl.h>
26 #include <linux/proc_fs.h>
27 #include <linux/security.h>
28 #include <linux/ctype.h>
29 #include <linux/utsname.h>
30 #include <linux/smp_lock.h>
31 #include <linux/fs.h>
32 #include <linux/init.h>
33 #include <linux/kernel.h>
34 #include <linux/kobject.h>
35 #include <linux/net.h>
36 #include <linux/sysrq.h>
37 #include <linux/highuid.h>
38 #include <linux/writeback.h>
39 #include <linux/hugetlb.h>
40 #include <linux/initrd.h>
41 #include <linux/key.h>
42 #include <linux/times.h>
43 #include <linux/limits.h>
44 #include <linux/dcache.h>
45 #include <linux/syscalls.h>
46 #include <linux/vmstat.h>
47 #include <linux/nfs_fs.h>
48 #include <linux/acpi.h>
49 #include <linux/reboot.h>
50 #include <linux/ftrace.h>
51 #include <linux/slow-work.h>
52 #include <linux/perf_counter.h>
53
54 #include <asm/uaccess.h>
55 #include <asm/processor.h>
56
57 #ifdef CONFIG_X86
58 #include <asm/nmi.h>
59 #include <asm/stacktrace.h>
60 #include <asm/io.h>
61 #endif
62
63 static int deprecated_sysctl_warning(struct __sysctl_args *args);
64
65 #if defined(CONFIG_SYSCTL)
66
67 /* External variables not in a header file. */
68 extern int C_A_D;
69 extern int print_fatal_signals;
70 extern int sysctl_overcommit_memory;
71 extern int sysctl_overcommit_ratio;
72 extern int sysctl_panic_on_oom;
73 extern int sysctl_oom_kill_allocating_task;
74 extern int sysctl_oom_dump_tasks;
75 extern int max_threads;
76 extern int core_uses_pid;
77 extern int suid_dumpable;
78 extern char core_pattern[];
79 extern int pid_max;
80 extern int min_free_kbytes;
81 extern int pid_max_min, pid_max_max;
82 extern int sysctl_drop_caches;
83 extern int percpu_pagelist_fraction;
84 extern int compat_log;
85 extern int latencytop_enabled;
86 extern int sysctl_nr_open_min, sysctl_nr_open_max;
87 #ifndef CONFIG_MMU
88 extern int sysctl_nr_trim_pages;
89 #endif
90 #ifdef CONFIG_RCU_TORTURE_TEST
91 extern int rcutorture_runnable;
92 #endif /* #ifdef CONFIG_RCU_TORTURE_TEST */
93
94 /* Constants used for minimum and maximum */
95 #ifdef CONFIG_DETECT_SOFTLOCKUP
96 static int sixty = 60;
97 static int neg_one = -1;
98 #endif
99
100 static int zero;
101 static int __maybe_unused one = 1;
102 static int __maybe_unused two = 2;
103 static unsigned long one_ul = 1;
104 static int one_hundred = 100;
105
106 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
107 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
108
109 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
110 static int maxolduid = 65535;
111 static int minolduid;
112 static int min_percpu_pagelist_fract = 8;
113
114 static int ngroups_max = NGROUPS_MAX;
115
116 #ifdef CONFIG_MODULES
117 extern char modprobe_path[];
118 extern int modules_disabled;
119 #endif
120 #ifdef CONFIG_CHR_DEV_SG
121 extern int sg_big_buff;
122 #endif
123
124 #ifdef CONFIG_SPARC
125 #include <asm/system.h>
126 #endif
127
128 #ifdef CONFIG_SPARC64
129 extern int sysctl_tsb_ratio;
130 #endif
131
132 #ifdef __hppa__
133 extern int pwrsw_enabled;
134 extern int unaligned_enabled;
135 #endif
136
137 #ifdef CONFIG_S390
138 #ifdef CONFIG_MATHEMU
139 extern int sysctl_ieee_emulation_warnings;
140 #endif
141 extern int sysctl_userprocess_debug;
142 extern int spin_retry;
143 #endif
144
145 #ifdef CONFIG_BSD_PROCESS_ACCT
146 extern int acct_parm[];
147 #endif
148
149 #ifdef CONFIG_IA64
150 extern int no_unaligned_warning;
151 extern int unaligned_dump_stack;
152 #endif
153
154 #ifdef CONFIG_RT_MUTEXES
155 extern int max_lock_depth;
156 #endif
157
158 #ifdef CONFIG_PROC_SYSCTL
159 static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
160 void __user *buffer, size_t *lenp, loff_t *ppos);
161 static int proc_taint(struct ctl_table *table, int write, struct file *filp,
162 void __user *buffer, size_t *lenp, loff_t *ppos);
163 #endif
164
165 static struct ctl_table root_table[];
166 static struct ctl_table_root sysctl_table_root;
167 static struct ctl_table_header root_table_header = {
168 .count = 1,
169 .ctl_table = root_table,
170 .ctl_entry = LIST_HEAD_INIT(sysctl_table_root.default_set.list),
171 .root = &sysctl_table_root,
172 .set = &sysctl_table_root.default_set,
173 };
174 static struct ctl_table_root sysctl_table_root = {
175 .root_list = LIST_HEAD_INIT(sysctl_table_root.root_list),
176 .default_set.list = LIST_HEAD_INIT(root_table_header.ctl_entry),
177 };
178
179 static struct ctl_table kern_table[];
180 static struct ctl_table vm_table[];
181 static struct ctl_table fs_table[];
182 static struct ctl_table debug_table[];
183 static struct ctl_table dev_table[];
184 extern struct ctl_table random_table[];
185 #ifdef CONFIG_INOTIFY_USER
186 extern struct ctl_table inotify_table[];
187 #endif
188 #ifdef CONFIG_EPOLL
189 extern struct ctl_table epoll_table[];
190 #endif
191
192 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
193 int sysctl_legacy_va_layout;
194 #endif
195
196 extern int prove_locking;
197 extern int lock_stat;
198
199 /* The default sysctl tables: */
200
201 static struct ctl_table root_table[] = {
202 {
203 .ctl_name = CTL_KERN,
204 .procname = "kernel",
205 .mode = 0555,
206 .child = kern_table,
207 },
208 {
209 .ctl_name = CTL_VM,
210 .procname = "vm",
211 .mode = 0555,
212 .child = vm_table,
213 },
214 {
215 .ctl_name = CTL_FS,
216 .procname = "fs",
217 .mode = 0555,
218 .child = fs_table,
219 },
220 {
221 .ctl_name = CTL_DEBUG,
222 .procname = "debug",
223 .mode = 0555,
224 .child = debug_table,
225 },
226 {
227 .ctl_name = CTL_DEV,
228 .procname = "dev",
229 .mode = 0555,
230 .child = dev_table,
231 },
232 /*
233 * NOTE: do not add new entries to this table unless you have read
234 * Documentation/sysctl/ctl_unnumbered.txt
235 */
236 { .ctl_name = 0 }
237 };
238
239 #ifdef CONFIG_SCHED_DEBUG
240 static int min_sched_granularity_ns = 100000; /* 100 usecs */
241 static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */
242 static int min_wakeup_granularity_ns; /* 0 usecs */
243 static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */
244 #endif
245
246 static struct ctl_table kern_table[] = {
247 #ifdef CONFIG_SCHED_DEBUG
248 {
249 .ctl_name = CTL_UNNUMBERED,
250 .procname = "sched_min_granularity_ns",
251 .data = &sysctl_sched_min_granularity,
252 .maxlen = sizeof(unsigned int),
253 .mode = 0644,
254 .proc_handler = &sched_nr_latency_handler,
255 .strategy = &sysctl_intvec,
256 .extra1 = &min_sched_granularity_ns,
257 .extra2 = &max_sched_granularity_ns,
258 },
259 {
260 .ctl_name = CTL_UNNUMBERED,
261 .procname = "sched_latency_ns",
262 .data = &sysctl_sched_latency,
263 .maxlen = sizeof(unsigned int),
264 .mode = 0644,
265 .proc_handler = &sched_nr_latency_handler,
266 .strategy = &sysctl_intvec,
267 .extra1 = &min_sched_granularity_ns,
268 .extra2 = &max_sched_granularity_ns,
269 },
270 {
271 .ctl_name = CTL_UNNUMBERED,
272 .procname = "sched_wakeup_granularity_ns",
273 .data = &sysctl_sched_wakeup_granularity,
274 .maxlen = sizeof(unsigned int),
275 .mode = 0644,
276 .proc_handler = &proc_dointvec_minmax,
277 .strategy = &sysctl_intvec,
278 .extra1 = &min_wakeup_granularity_ns,
279 .extra2 = &max_wakeup_granularity_ns,
280 },
281 {
282 .ctl_name = CTL_UNNUMBERED,
283 .procname = "sched_shares_ratelimit",
284 .data = &sysctl_sched_shares_ratelimit,
285 .maxlen = sizeof(unsigned int),
286 .mode = 0644,
287 .proc_handler = &proc_dointvec,
288 },
289 {
290 .ctl_name = CTL_UNNUMBERED,
291 .procname = "sched_shares_thresh",
292 .data = &sysctl_sched_shares_thresh,
293 .maxlen = sizeof(unsigned int),
294 .mode = 0644,
295 .proc_handler = &proc_dointvec_minmax,
296 .strategy = &sysctl_intvec,
297 .extra1 = &zero,
298 },
299 {
300 .ctl_name = CTL_UNNUMBERED,
301 .procname = "sched_child_runs_first",
302 .data = &sysctl_sched_child_runs_first,
303 .maxlen = sizeof(unsigned int),
304 .mode = 0644,
305 .proc_handler = &proc_dointvec,
306 },
307 {
308 .ctl_name = CTL_UNNUMBERED,
309 .procname = "sched_features",
310 .data = &sysctl_sched_features,
311 .maxlen = sizeof(unsigned int),
312 .mode = 0644,
313 .proc_handler = &proc_dointvec,
314 },
315 {
316 .ctl_name = CTL_UNNUMBERED,
317 .procname = "sched_migration_cost",
318 .data = &sysctl_sched_migration_cost,
319 .maxlen = sizeof(unsigned int),
320 .mode = 0644,
321 .proc_handler = &proc_dointvec,
322 },
323 {
324 .ctl_name = CTL_UNNUMBERED,
325 .procname = "sched_nr_migrate",
326 .data = &sysctl_sched_nr_migrate,
327 .maxlen = sizeof(unsigned int),
328 .mode = 0644,
329 .proc_handler = &proc_dointvec,
330 },
331 {
332 .ctl_name = CTL_UNNUMBERED,
333 .procname = "timer_migration",
334 .data = &sysctl_timer_migration,
335 .maxlen = sizeof(unsigned int),
336 .mode = 0644,
337 .proc_handler = &proc_dointvec,
338 },
339 #endif
340 {
341 .ctl_name = CTL_UNNUMBERED,
342 .procname = "sched_rt_period_us",
343 .data = &sysctl_sched_rt_period,
344 .maxlen = sizeof(unsigned int),
345 .mode = 0644,
346 .proc_handler = &sched_rt_handler,
347 },
348 {
349 .ctl_name = CTL_UNNUMBERED,
350 .procname = "sched_rt_runtime_us",
351 .data = &sysctl_sched_rt_runtime,
352 .maxlen = sizeof(int),
353 .mode = 0644,
354 .proc_handler = &sched_rt_handler,
355 },
356 {
357 .ctl_name = CTL_UNNUMBERED,
358 .procname = "sched_compat_yield",
359 .data = &sysctl_sched_compat_yield,
360 .maxlen = sizeof(unsigned int),
361 .mode = 0644,
362 .proc_handler = &proc_dointvec,
363 },
364 #ifdef CONFIG_PROVE_LOCKING
365 {
366 .ctl_name = CTL_UNNUMBERED,
367 .procname = "prove_locking",
368 .data = &prove_locking,
369 .maxlen = sizeof(int),
370 .mode = 0644,
371 .proc_handler = &proc_dointvec,
372 },
373 #endif
374 #ifdef CONFIG_LOCK_STAT
375 {
376 .ctl_name = CTL_UNNUMBERED,
377 .procname = "lock_stat",
378 .data = &lock_stat,
379 .maxlen = sizeof(int),
380 .mode = 0644,
381 .proc_handler = &proc_dointvec,
382 },
383 #endif
384 {
385 .ctl_name = KERN_PANIC,
386 .procname = "panic",
387 .data = &panic_timeout,
388 .maxlen = sizeof(int),
389 .mode = 0644,
390 .proc_handler = &proc_dointvec,
391 },
392 {
393 .ctl_name = KERN_CORE_USES_PID,
394 .procname = "core_uses_pid",
395 .data = &core_uses_pid,
396 .maxlen = sizeof(int),
397 .mode = 0644,
398 .proc_handler = &proc_dointvec,
399 },
400 {
401 .ctl_name = KERN_CORE_PATTERN,
402 .procname = "core_pattern",
403 .data = core_pattern,
404 .maxlen = CORENAME_MAX_SIZE,
405 .mode = 0644,
406 .proc_handler = &proc_dostring,
407 .strategy = &sysctl_string,
408 },
409 #ifdef CONFIG_PROC_SYSCTL
410 {
411 .procname = "tainted",
412 .maxlen = sizeof(long),
413 .mode = 0644,
414 .proc_handler = &proc_taint,
415 },
416 #endif
417 #ifdef CONFIG_LATENCYTOP
418 {
419 .procname = "latencytop",
420 .data = &latencytop_enabled,
421 .maxlen = sizeof(int),
422 .mode = 0644,
423 .proc_handler = &proc_dointvec,
424 },
425 #endif
426 #ifdef CONFIG_BLK_DEV_INITRD
427 {
428 .ctl_name = KERN_REALROOTDEV,
429 .procname = "real-root-dev",
430 .data = &real_root_dev,
431 .maxlen = sizeof(int),
432 .mode = 0644,
433 .proc_handler = &proc_dointvec,
434 },
435 #endif
436 {
437 .ctl_name = CTL_UNNUMBERED,
438 .procname = "print-fatal-signals",
439 .data = &print_fatal_signals,
440 .maxlen = sizeof(int),
441 .mode = 0644,
442 .proc_handler = &proc_dointvec,
443 },
444 #ifdef CONFIG_SPARC
445 {
446 .ctl_name = KERN_SPARC_REBOOT,
447 .procname = "reboot-cmd",
448 .data = reboot_command,
449 .maxlen = 256,
450 .mode = 0644,
451 .proc_handler = &proc_dostring,
452 .strategy = &sysctl_string,
453 },
454 {
455 .ctl_name = KERN_SPARC_STOP_A,
456 .procname = "stop-a",
457 .data = &stop_a_enabled,
458 .maxlen = sizeof (int),
459 .mode = 0644,
460 .proc_handler = &proc_dointvec,
461 },
462 {
463 .ctl_name = KERN_SPARC_SCONS_PWROFF,
464 .procname = "scons-poweroff",
465 .data = &scons_pwroff,
466 .maxlen = sizeof (int),
467 .mode = 0644,
468 .proc_handler = &proc_dointvec,
469 },
470 #endif
471 #ifdef CONFIG_SPARC64
472 {
473 .ctl_name = CTL_UNNUMBERED,
474 .procname = "tsb-ratio",
475 .data = &sysctl_tsb_ratio,
476 .maxlen = sizeof (int),
477 .mode = 0644,
478 .proc_handler = &proc_dointvec,
479 },
480 #endif
481 #ifdef __hppa__
482 {
483 .ctl_name = KERN_HPPA_PWRSW,
484 .procname = "soft-power",
485 .data = &pwrsw_enabled,
486 .maxlen = sizeof (int),
487 .mode = 0644,
488 .proc_handler = &proc_dointvec,
489 },
490 {
491 .ctl_name = KERN_HPPA_UNALIGNED,
492 .procname = "unaligned-trap",
493 .data = &unaligned_enabled,
494 .maxlen = sizeof (int),
495 .mode = 0644,
496 .proc_handler = &proc_dointvec,
497 },
498 #endif
499 {
500 .ctl_name = KERN_CTLALTDEL,
501 .procname = "ctrl-alt-del",
502 .data = &C_A_D,
503 .maxlen = sizeof(int),
504 .mode = 0644,
505 .proc_handler = &proc_dointvec,
506 },
507 #ifdef CONFIG_FUNCTION_TRACER
508 {
509 .ctl_name = CTL_UNNUMBERED,
510 .procname = "ftrace_enabled",
511 .data = &ftrace_enabled,
512 .maxlen = sizeof(int),
513 .mode = 0644,
514 .proc_handler = &ftrace_enable_sysctl,
515 },
516 #endif
517 #ifdef CONFIG_STACK_TRACER
518 {
519 .ctl_name = CTL_UNNUMBERED,
520 .procname = "stack_tracer_enabled",
521 .data = &stack_tracer_enabled,
522 .maxlen = sizeof(int),
523 .mode = 0644,
524 .proc_handler = &stack_trace_sysctl,
525 },
526 #endif
527 #ifdef CONFIG_TRACING
528 {
529 .ctl_name = CTL_UNNUMBERED,
530 .procname = "ftrace_dump_on_oops",
531 .data = &ftrace_dump_on_oops,
532 .maxlen = sizeof(int),
533 .mode = 0644,
534 .proc_handler = &proc_dointvec,
535 },
536 #endif
537 #ifdef CONFIG_MODULES
538 {
539 .ctl_name = KERN_MODPROBE,
540 .procname = "modprobe",
541 .data = &modprobe_path,
542 .maxlen = KMOD_PATH_LEN,
543 .mode = 0644,
544 .proc_handler = &proc_dostring,
545 .strategy = &sysctl_string,
546 },
547 {
548 .ctl_name = CTL_UNNUMBERED,
549 .procname = "modules_disabled",
550 .data = &modules_disabled,
551 .maxlen = sizeof(int),
552 .mode = 0644,
553 /* only handle a transition from default "0" to "1" */
554 .proc_handler = &proc_dointvec_minmax,
555 .extra1 = &one,
556 .extra2 = &one,
557 },
558 #endif
559 #if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET)
560 {
561 .ctl_name = KERN_HOTPLUG,
562 .procname = "hotplug",
563 .data = &uevent_helper,
564 .maxlen = UEVENT_HELPER_PATH_LEN,
565 .mode = 0644,
566 .proc_handler = &proc_dostring,
567 .strategy = &sysctl_string,
568 },
569 #endif
570 #ifdef CONFIG_CHR_DEV_SG
571 {
572 .ctl_name = KERN_SG_BIG_BUFF,
573 .procname = "sg-big-buff",
574 .data = &sg_big_buff,
575 .maxlen = sizeof (int),
576 .mode = 0444,
577 .proc_handler = &proc_dointvec,
578 },
579 #endif
580 #ifdef CONFIG_BSD_PROCESS_ACCT
581 {
582 .ctl_name = KERN_ACCT,
583 .procname = "acct",
584 .data = &acct_parm,
585 .maxlen = 3*sizeof(int),
586 .mode = 0644,
587 .proc_handler = &proc_dointvec,
588 },
589 #endif
590 #ifdef CONFIG_MAGIC_SYSRQ
591 {
592 .ctl_name = KERN_SYSRQ,
593 .procname = "sysrq",
594 .data = &__sysrq_enabled,
595 .maxlen = sizeof (int),
596 .mode = 0644,
597 .proc_handler = &proc_dointvec,
598 },
599 #endif
600 #ifdef CONFIG_PROC_SYSCTL
601 {
602 .procname = "cad_pid",
603 .data = NULL,
604 .maxlen = sizeof (int),
605 .mode = 0600,
606 .proc_handler = &proc_do_cad_pid,
607 },
608 #endif
609 {
610 .ctl_name = KERN_MAX_THREADS,
611 .procname = "threads-max",
612 .data = &max_threads,
613 .maxlen = sizeof(int),
614 .mode = 0644,
615 .proc_handler = &proc_dointvec,
616 },
617 {
618 .ctl_name = KERN_RANDOM,
619 .procname = "random",
620 .mode = 0555,
621 .child = random_table,
622 },
623 {
624 .ctl_name = KERN_OVERFLOWUID,
625 .procname = "overflowuid",
626 .data = &overflowuid,
627 .maxlen = sizeof(int),
628 .mode = 0644,
629 .proc_handler = &proc_dointvec_minmax,
630 .strategy = &sysctl_intvec,
631 .extra1 = &minolduid,
632 .extra2 = &maxolduid,
633 },
634 {
635 .ctl_name = KERN_OVERFLOWGID,
636 .procname = "overflowgid",
637 .data = &overflowgid,
638 .maxlen = sizeof(int),
639 .mode = 0644,
640 .proc_handler = &proc_dointvec_minmax,
641 .strategy = &sysctl_intvec,
642 .extra1 = &minolduid,
643 .extra2 = &maxolduid,
644 },
645 #ifdef CONFIG_S390
646 #ifdef CONFIG_MATHEMU
647 {
648 .ctl_name = KERN_IEEE_EMULATION_WARNINGS,
649 .procname = "ieee_emulation_warnings",
650 .data = &sysctl_ieee_emulation_warnings,
651 .maxlen = sizeof(int),
652 .mode = 0644,
653 .proc_handler = &proc_dointvec,
654 },
655 #endif
656 {
657 .ctl_name = KERN_S390_USER_DEBUG_LOGGING,
658 .procname = "userprocess_debug",
659 .data = &sysctl_userprocess_debug,
660 .maxlen = sizeof(int),
661 .mode = 0644,
662 .proc_handler = &proc_dointvec,
663 },
664 #endif
665 {
666 .ctl_name = KERN_PIDMAX,
667 .procname = "pid_max",
668 .data = &pid_max,
669 .maxlen = sizeof (int),
670 .mode = 0644,
671 .proc_handler = &proc_dointvec_minmax,
672 .strategy = sysctl_intvec,
673 .extra1 = &pid_max_min,
674 .extra2 = &pid_max_max,
675 },
676 {
677 .ctl_name = KERN_PANIC_ON_OOPS,
678 .procname = "panic_on_oops",
679 .data = &panic_on_oops,
680 .maxlen = sizeof(int),
681 .mode = 0644,
682 .proc_handler = &proc_dointvec,
683 },
684 #if defined CONFIG_PRINTK
685 {
686 .ctl_name = KERN_PRINTK,
687 .procname = "printk",
688 .data = &console_loglevel,
689 .maxlen = 4*sizeof(int),
690 .mode = 0644,
691 .proc_handler = &proc_dointvec,
692 },
693 {
694 .ctl_name = KERN_PRINTK_RATELIMIT,
695 .procname = "printk_ratelimit",
696 .data = &printk_ratelimit_state.interval,
697 .maxlen = sizeof(int),
698 .mode = 0644,
699 .proc_handler = &proc_dointvec_jiffies,
700 .strategy = &sysctl_jiffies,
701 },
702 {
703 .ctl_name = KERN_PRINTK_RATELIMIT_BURST,
704 .procname = "printk_ratelimit_burst",
705 .data = &printk_ratelimit_state.burst,
706 .maxlen = sizeof(int),
707 .mode = 0644,
708 .proc_handler = &proc_dointvec,
709 },
710 #endif
711 {
712 .ctl_name = KERN_NGROUPS_MAX,
713 .procname = "ngroups_max",
714 .data = &ngroups_max,
715 .maxlen = sizeof (int),
716 .mode = 0444,
717 .proc_handler = &proc_dointvec,
718 },
719 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
720 {
721 .ctl_name = KERN_UNKNOWN_NMI_PANIC,
722 .procname = "unknown_nmi_panic",
723 .data = &unknown_nmi_panic,
724 .maxlen = sizeof (int),
725 .mode = 0644,
726 .proc_handler = &proc_dointvec,
727 },
728 {
729 .procname = "nmi_watchdog",
730 .data = &nmi_watchdog_enabled,
731 .maxlen = sizeof (int),
732 .mode = 0644,
733 .proc_handler = &proc_nmi_enabled,
734 },
735 #endif
736 #if defined(CONFIG_X86)
737 {
738 .ctl_name = KERN_PANIC_ON_NMI,
739 .procname = "panic_on_unrecovered_nmi",
740 .data = &panic_on_unrecovered_nmi,
741 .maxlen = sizeof(int),
742 .mode = 0644,
743 .proc_handler = &proc_dointvec,
744 },
745 {
746 .ctl_name = KERN_BOOTLOADER_TYPE,
747 .procname = "bootloader_type",
748 .data = &bootloader_type,
749 .maxlen = sizeof (int),
750 .mode = 0444,
751 .proc_handler = &proc_dointvec,
752 },
753 {
754 .ctl_name = CTL_UNNUMBERED,
755 .procname = "bootloader_version",
756 .data = &bootloader_version,
757 .maxlen = sizeof (int),
758 .mode = 0444,
759 .proc_handler = &proc_dointvec,
760 },
761 {
762 .ctl_name = CTL_UNNUMBERED,
763 .procname = "kstack_depth_to_print",
764 .data = &kstack_depth_to_print,
765 .maxlen = sizeof(int),
766 .mode = 0644,
767 .proc_handler = &proc_dointvec,
768 },
769 {
770 .ctl_name = CTL_UNNUMBERED,
771 .procname = "io_delay_type",
772 .data = &io_delay_type,
773 .maxlen = sizeof(int),
774 .mode = 0644,
775 .proc_handler = &proc_dointvec,
776 },
777 #endif
778 #if defined(CONFIG_MMU)
779 {
780 .ctl_name = KERN_RANDOMIZE,
781 .procname = "randomize_va_space",
782 .data = &randomize_va_space,
783 .maxlen = sizeof(int),
784 .mode = 0644,
785 .proc_handler = &proc_dointvec,
786 },
787 #endif
788 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
789 {
790 .ctl_name = KERN_SPIN_RETRY,
791 .procname = "spin_retry",
792 .data = &spin_retry,
793 .maxlen = sizeof (int),
794 .mode = 0644,
795 .proc_handler = &proc_dointvec,
796 },
797 #endif
798 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
799 {
800 .procname = "acpi_video_flags",
801 .data = &acpi_realmode_flags,
802 .maxlen = sizeof (unsigned long),
803 .mode = 0644,
804 .proc_handler = &proc_doulongvec_minmax,
805 },
806 #endif
807 #ifdef CONFIG_IA64
808 {
809 .ctl_name = KERN_IA64_UNALIGNED,
810 .procname = "ignore-unaligned-usertrap",
811 .data = &no_unaligned_warning,
812 .maxlen = sizeof (int),
813 .mode = 0644,
814 .proc_handler = &proc_dointvec,
815 },
816 {
817 .ctl_name = CTL_UNNUMBERED,
818 .procname = "unaligned-dump-stack",
819 .data = &unaligned_dump_stack,
820 .maxlen = sizeof (int),
821 .mode = 0644,
822 .proc_handler = &proc_dointvec,
823 },
824 #endif
825 #ifdef CONFIG_DETECT_SOFTLOCKUP
826 {
827 .ctl_name = CTL_UNNUMBERED,
828 .procname = "softlockup_panic",
829 .data = &softlockup_panic,
830 .maxlen = sizeof(int),
831 .mode = 0644,
832 .proc_handler = &proc_dointvec_minmax,
833 .strategy = &sysctl_intvec,
834 .extra1 = &zero,
835 .extra2 = &one,
836 },
837 {
838 .ctl_name = CTL_UNNUMBERED,
839 .procname = "softlockup_thresh",
840 .data = &softlockup_thresh,
841 .maxlen = sizeof(int),
842 .mode = 0644,
843 .proc_handler = &proc_dosoftlockup_thresh,
844 .strategy = &sysctl_intvec,
845 .extra1 = &neg_one,
846 .extra2 = &sixty,
847 },
848 #endif
849 #ifdef CONFIG_DETECT_HUNG_TASK
850 {
851 .ctl_name = CTL_UNNUMBERED,
852 .procname = "hung_task_panic",
853 .data = &sysctl_hung_task_panic,
854 .maxlen = sizeof(int),
855 .mode = 0644,
856 .proc_handler = &proc_dointvec_minmax,
857 .strategy = &sysctl_intvec,
858 .extra1 = &zero,
859 .extra2 = &one,
860 },
861 {
862 .ctl_name = CTL_UNNUMBERED,
863 .procname = "hung_task_check_count",
864 .data = &sysctl_hung_task_check_count,
865 .maxlen = sizeof(unsigned long),
866 .mode = 0644,
867 .proc_handler = &proc_doulongvec_minmax,
868 .strategy = &sysctl_intvec,
869 },
870 {
871 .ctl_name = CTL_UNNUMBERED,
872 .procname = "hung_task_timeout_secs",
873 .data = &sysctl_hung_task_timeout_secs,
874 .maxlen = sizeof(unsigned long),
875 .mode = 0644,
876 .proc_handler = &proc_dohung_task_timeout_secs,
877 .strategy = &sysctl_intvec,
878 },
879 {
880 .ctl_name = CTL_UNNUMBERED,
881 .procname = "hung_task_warnings",
882 .data = &sysctl_hung_task_warnings,
883 .maxlen = sizeof(unsigned long),
884 .mode = 0644,
885 .proc_handler = &proc_doulongvec_minmax,
886 .strategy = &sysctl_intvec,
887 },
888 #endif
889 #ifdef CONFIG_COMPAT
890 {
891 .ctl_name = KERN_COMPAT_LOG,
892 .procname = "compat-log",
893 .data = &compat_log,
894 .maxlen = sizeof (int),
895 .mode = 0644,
896 .proc_handler = &proc_dointvec,
897 },
898 #endif
899 #ifdef CONFIG_RT_MUTEXES
900 {
901 .ctl_name = KERN_MAX_LOCK_DEPTH,
902 .procname = "max_lock_depth",
903 .data = &max_lock_depth,
904 .maxlen = sizeof(int),
905 .mode = 0644,
906 .proc_handler = &proc_dointvec,
907 },
908 #endif
909 {
910 .ctl_name = CTL_UNNUMBERED,
911 .procname = "poweroff_cmd",
912 .data = &poweroff_cmd,
913 .maxlen = POWEROFF_CMD_PATH_LEN,
914 .mode = 0644,
915 .proc_handler = &proc_dostring,
916 .strategy = &sysctl_string,
917 },
918 #ifdef CONFIG_KEYS
919 {
920 .ctl_name = CTL_UNNUMBERED,
921 .procname = "keys",
922 .mode = 0555,
923 .child = key_sysctls,
924 },
925 #endif
926 #ifdef CONFIG_RCU_TORTURE_TEST
927 {
928 .ctl_name = CTL_UNNUMBERED,
929 .procname = "rcutorture_runnable",
930 .data = &rcutorture_runnable,
931 .maxlen = sizeof(int),
932 .mode = 0644,
933 .proc_handler = &proc_dointvec,
934 },
935 #endif
936 #ifdef CONFIG_SLOW_WORK
937 {
938 .ctl_name = CTL_UNNUMBERED,
939 .procname = "slow-work",
940 .mode = 0555,
941 .child = slow_work_sysctls,
942 },
943 #endif
944 #ifdef CONFIG_PERF_COUNTERS
945 {
946 .ctl_name = CTL_UNNUMBERED,
947 .procname = "perf_counter_paranoid",
948 .data = &sysctl_perf_counter_paranoid,
949 .maxlen = sizeof(sysctl_perf_counter_paranoid),
950 .mode = 0644,
951 .proc_handler = &proc_dointvec,
952 },
953 {
954 .ctl_name = CTL_UNNUMBERED,
955 .procname = "perf_counter_mlock_kb",
956 .data = &sysctl_perf_counter_mlock,
957 .maxlen = sizeof(sysctl_perf_counter_mlock),
958 .mode = 0644,
959 .proc_handler = &proc_dointvec,
960 },
961 {
962 .ctl_name = CTL_UNNUMBERED,
963 .procname = "perf_counter_max_sample_rate",
964 .data = &sysctl_perf_counter_sample_rate,
965 .maxlen = sizeof(sysctl_perf_counter_sample_rate),
966 .mode = 0644,
967 .proc_handler = &proc_dointvec,
968 },
969 #endif
970 /*
971 * NOTE: do not add new entries to this table unless you have read
972 * Documentation/sysctl/ctl_unnumbered.txt
973 */
974 { .ctl_name = 0 }
975 };
976
977 static struct ctl_table vm_table[] = {
978 {
979 .ctl_name = VM_OVERCOMMIT_MEMORY,
980 .procname = "overcommit_memory",
981 .data = &sysctl_overcommit_memory,
982 .maxlen = sizeof(sysctl_overcommit_memory),
983 .mode = 0644,
984 .proc_handler = &proc_dointvec,
985 },
986 {
987 .ctl_name = VM_PANIC_ON_OOM,
988 .procname = "panic_on_oom",
989 .data = &sysctl_panic_on_oom,
990 .maxlen = sizeof(sysctl_panic_on_oom),
991 .mode = 0644,
992 .proc_handler = &proc_dointvec,
993 },
994 {
995 .ctl_name = CTL_UNNUMBERED,
996 .procname = "oom_kill_allocating_task",
997 .data = &sysctl_oom_kill_allocating_task,
998 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
999 .mode = 0644,
1000 .proc_handler = &proc_dointvec,
1001 },
1002 {
1003 .ctl_name = CTL_UNNUMBERED,
1004 .procname = "oom_dump_tasks",
1005 .data = &sysctl_oom_dump_tasks,
1006 .maxlen = sizeof(sysctl_oom_dump_tasks),
1007 .mode = 0644,
1008 .proc_handler = &proc_dointvec,
1009 },
1010 {
1011 .ctl_name = VM_OVERCOMMIT_RATIO,
1012 .procname = "overcommit_ratio",
1013 .data = &sysctl_overcommit_ratio,
1014 .maxlen = sizeof(sysctl_overcommit_ratio),
1015 .mode = 0644,
1016 .proc_handler = &proc_dointvec,
1017 },
1018 {
1019 .ctl_name = VM_PAGE_CLUSTER,
1020 .procname = "page-cluster",
1021 .data = &page_cluster,
1022 .maxlen = sizeof(int),
1023 .mode = 0644,
1024 .proc_handler = &proc_dointvec,
1025 },
1026 {
1027 .ctl_name = VM_DIRTY_BACKGROUND,
1028 .procname = "dirty_background_ratio",
1029 .data = &dirty_background_ratio,
1030 .maxlen = sizeof(dirty_background_ratio),
1031 .mode = 0644,
1032 .proc_handler = &dirty_background_ratio_handler,
1033 .strategy = &sysctl_intvec,
1034 .extra1 = &zero,
1035 .extra2 = &one_hundred,
1036 },
1037 {
1038 .ctl_name = CTL_UNNUMBERED,
1039 .procname = "dirty_background_bytes",
1040 .data = &dirty_background_bytes,
1041 .maxlen = sizeof(dirty_background_bytes),
1042 .mode = 0644,
1043 .proc_handler = &dirty_background_bytes_handler,
1044 .strategy = &sysctl_intvec,
1045 .extra1 = &one_ul,
1046 },
1047 {
1048 .ctl_name = VM_DIRTY_RATIO,
1049 .procname = "dirty_ratio",
1050 .data = &vm_dirty_ratio,
1051 .maxlen = sizeof(vm_dirty_ratio),
1052 .mode = 0644,
1053 .proc_handler = &dirty_ratio_handler,
1054 .strategy = &sysctl_intvec,
1055 .extra1 = &zero,
1056 .extra2 = &one_hundred,
1057 },
1058 {
1059 .ctl_name = CTL_UNNUMBERED,
1060 .procname = "dirty_bytes",
1061 .data = &vm_dirty_bytes,
1062 .maxlen = sizeof(vm_dirty_bytes),
1063 .mode = 0644,
1064 .proc_handler = &dirty_bytes_handler,
1065 .strategy = &sysctl_intvec,
1066 .extra1 = &dirty_bytes_min,
1067 },
1068 {
1069 .procname = "dirty_writeback_centisecs",
1070 .data = &dirty_writeback_interval,
1071 .maxlen = sizeof(dirty_writeback_interval),
1072 .mode = 0644,
1073 .proc_handler = &dirty_writeback_centisecs_handler,
1074 },
1075 {
1076 .procname = "dirty_expire_centisecs",
1077 .data = &dirty_expire_interval,
1078 .maxlen = sizeof(dirty_expire_interval),
1079 .mode = 0644,
1080 .proc_handler = &proc_dointvec,
1081 },
1082 {
1083 .ctl_name = VM_NR_PDFLUSH_THREADS,
1084 .procname = "nr_pdflush_threads",
1085 .data = &nr_pdflush_threads,
1086 .maxlen = sizeof nr_pdflush_threads,
1087 .mode = 0444 /* read-only*/,
1088 .proc_handler = &proc_dointvec,
1089 },
1090 {
1091 .ctl_name = VM_SWAPPINESS,
1092 .procname = "swappiness",
1093 .data = &vm_swappiness,
1094 .maxlen = sizeof(vm_swappiness),
1095 .mode = 0644,
1096 .proc_handler = &proc_dointvec_minmax,
1097 .strategy = &sysctl_intvec,
1098 .extra1 = &zero,
1099 .extra2 = &one_hundred,
1100 },
1101 #ifdef CONFIG_HUGETLB_PAGE
1102 {
1103 .procname = "nr_hugepages",
1104 .data = NULL,
1105 .maxlen = sizeof(unsigned long),
1106 .mode = 0644,
1107 .proc_handler = &hugetlb_sysctl_handler,
1108 .extra1 = (void *)&hugetlb_zero,
1109 .extra2 = (void *)&hugetlb_infinity,
1110 },
1111 {
1112 .ctl_name = VM_HUGETLB_GROUP,
1113 .procname = "hugetlb_shm_group",
1114 .data = &sysctl_hugetlb_shm_group,
1115 .maxlen = sizeof(gid_t),
1116 .mode = 0644,
1117 .proc_handler = &proc_dointvec,
1118 },
1119 {
1120 .ctl_name = CTL_UNNUMBERED,
1121 .procname = "hugepages_treat_as_movable",
1122 .data = &hugepages_treat_as_movable,
1123 .maxlen = sizeof(int),
1124 .mode = 0644,
1125 .proc_handler = &hugetlb_treat_movable_handler,
1126 },
1127 {
1128 .ctl_name = CTL_UNNUMBERED,
1129 .procname = "nr_overcommit_hugepages",
1130 .data = NULL,
1131 .maxlen = sizeof(unsigned long),
1132 .mode = 0644,
1133 .proc_handler = &hugetlb_overcommit_handler,
1134 .extra1 = (void *)&hugetlb_zero,
1135 .extra2 = (void *)&hugetlb_infinity,
1136 },
1137 #endif
1138 {
1139 .ctl_name = VM_LOWMEM_RESERVE_RATIO,
1140 .procname = "lowmem_reserve_ratio",
1141 .data = &sysctl_lowmem_reserve_ratio,
1142 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1143 .mode = 0644,
1144 .proc_handler = &lowmem_reserve_ratio_sysctl_handler,
1145 .strategy = &sysctl_intvec,
1146 },
1147 {
1148 .ctl_name = VM_DROP_PAGECACHE,
1149 .procname = "drop_caches",
1150 .data = &sysctl_drop_caches,
1151 .maxlen = sizeof(int),
1152 .mode = 0644,
1153 .proc_handler = drop_caches_sysctl_handler,
1154 .strategy = &sysctl_intvec,
1155 },
1156 {
1157 .ctl_name = VM_MIN_FREE_KBYTES,
1158 .procname = "min_free_kbytes",
1159 .data = &min_free_kbytes,
1160 .maxlen = sizeof(min_free_kbytes),
1161 .mode = 0644,
1162 .proc_handler = &min_free_kbytes_sysctl_handler,
1163 .strategy = &sysctl_intvec,
1164 .extra1 = &zero,
1165 },
1166 {
1167 .ctl_name = VM_PERCPU_PAGELIST_FRACTION,
1168 .procname = "percpu_pagelist_fraction",
1169 .data = &percpu_pagelist_fraction,
1170 .maxlen = sizeof(percpu_pagelist_fraction),
1171 .mode = 0644,
1172 .proc_handler = &percpu_pagelist_fraction_sysctl_handler,
1173 .strategy = &sysctl_intvec,
1174 .extra1 = &min_percpu_pagelist_fract,
1175 },
1176 #ifdef CONFIG_MMU
1177 {
1178 .ctl_name = VM_MAX_MAP_COUNT,
1179 .procname = "max_map_count",
1180 .data = &sysctl_max_map_count,
1181 .maxlen = sizeof(sysctl_max_map_count),
1182 .mode = 0644,
1183 .proc_handler = &proc_dointvec
1184 },
1185 #else
1186 {
1187 .ctl_name = CTL_UNNUMBERED,
1188 .procname = "nr_trim_pages",
1189 .data = &sysctl_nr_trim_pages,
1190 .maxlen = sizeof(sysctl_nr_trim_pages),
1191 .mode = 0644,
1192 .proc_handler = &proc_dointvec_minmax,
1193 .strategy = &sysctl_intvec,
1194 .extra1 = &zero,
1195 },
1196 #endif
1197 {
1198 .ctl_name = VM_LAPTOP_MODE,
1199 .procname = "laptop_mode",
1200 .data = &laptop_mode,
1201 .maxlen = sizeof(laptop_mode),
1202 .mode = 0644,
1203 .proc_handler = &proc_dointvec_jiffies,
1204 .strategy = &sysctl_jiffies,
1205 },
1206 {
1207 .ctl_name = VM_BLOCK_DUMP,
1208 .procname = "block_dump",
1209 .data = &block_dump,
1210 .maxlen = sizeof(block_dump),
1211 .mode = 0644,
1212 .proc_handler = &proc_dointvec,
1213 .strategy = &sysctl_intvec,
1214 .extra1 = &zero,
1215 },
1216 {
1217 .ctl_name = VM_VFS_CACHE_PRESSURE,
1218 .procname = "vfs_cache_pressure",
1219 .data = &sysctl_vfs_cache_pressure,
1220 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1221 .mode = 0644,
1222 .proc_handler = &proc_dointvec,
1223 .strategy = &sysctl_intvec,
1224 .extra1 = &zero,
1225 },
1226 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1227 {
1228 .ctl_name = VM_LEGACY_VA_LAYOUT,
1229 .procname = "legacy_va_layout",
1230 .data = &sysctl_legacy_va_layout,
1231 .maxlen = sizeof(sysctl_legacy_va_layout),
1232 .mode = 0644,
1233 .proc_handler = &proc_dointvec,
1234 .strategy = &sysctl_intvec,
1235 .extra1 = &zero,
1236 },
1237 #endif
1238 #ifdef CONFIG_NUMA
1239 {
1240 .ctl_name = VM_ZONE_RECLAIM_MODE,
1241 .procname = "zone_reclaim_mode",
1242 .data = &zone_reclaim_mode,
1243 .maxlen = sizeof(zone_reclaim_mode),
1244 .mode = 0644,
1245 .proc_handler = &proc_dointvec,
1246 .strategy = &sysctl_intvec,
1247 .extra1 = &zero,
1248 },
1249 {
1250 .ctl_name = VM_MIN_UNMAPPED,
1251 .procname = "min_unmapped_ratio",
1252 .data = &sysctl_min_unmapped_ratio,
1253 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1254 .mode = 0644,
1255 .proc_handler = &sysctl_min_unmapped_ratio_sysctl_handler,
1256 .strategy = &sysctl_intvec,
1257 .extra1 = &zero,
1258 .extra2 = &one_hundred,
1259 },
1260 {
1261 .ctl_name = VM_MIN_SLAB,
1262 .procname = "min_slab_ratio",
1263 .data = &sysctl_min_slab_ratio,
1264 .maxlen = sizeof(sysctl_min_slab_ratio),
1265 .mode = 0644,
1266 .proc_handler = &sysctl_min_slab_ratio_sysctl_handler,
1267 .strategy = &sysctl_intvec,
1268 .extra1 = &zero,
1269 .extra2 = &one_hundred,
1270 },
1271 #endif
1272 #ifdef CONFIG_SMP
1273 {
1274 .ctl_name = CTL_UNNUMBERED,
1275 .procname = "stat_interval",
1276 .data = &sysctl_stat_interval,
1277 .maxlen = sizeof(sysctl_stat_interval),
1278 .mode = 0644,
1279 .proc_handler = &proc_dointvec_jiffies,
1280 .strategy = &sysctl_jiffies,
1281 },
1282 #endif
1283 {
1284 .ctl_name = CTL_UNNUMBERED,
1285 .procname = "mmap_min_addr",
1286 .data = &mmap_min_addr,
1287 .maxlen = sizeof(unsigned long),
1288 .mode = 0644,
1289 .proc_handler = &proc_doulongvec_minmax,
1290 },
1291 #ifdef CONFIG_NUMA
1292 {
1293 .ctl_name = CTL_UNNUMBERED,
1294 .procname = "numa_zonelist_order",
1295 .data = &numa_zonelist_order,
1296 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1297 .mode = 0644,
1298 .proc_handler = &numa_zonelist_order_handler,
1299 .strategy = &sysctl_string,
1300 },
1301 #endif
1302 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1303 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1304 {
1305 .ctl_name = VM_VDSO_ENABLED,
1306 .procname = "vdso_enabled",
1307 .data = &vdso_enabled,
1308 .maxlen = sizeof(vdso_enabled),
1309 .mode = 0644,
1310 .proc_handler = &proc_dointvec,
1311 .strategy = &sysctl_intvec,
1312 .extra1 = &zero,
1313 },
1314 #endif
1315 #ifdef CONFIG_HIGHMEM
1316 {
1317 .ctl_name = CTL_UNNUMBERED,
1318 .procname = "highmem_is_dirtyable",
1319 .data = &vm_highmem_is_dirtyable,
1320 .maxlen = sizeof(vm_highmem_is_dirtyable),
1321 .mode = 0644,
1322 .proc_handler = &proc_dointvec_minmax,
1323 .strategy = &sysctl_intvec,
1324 .extra1 = &zero,
1325 .extra2 = &one,
1326 },
1327 #endif
1328 #ifdef CONFIG_UNEVICTABLE_LRU
1329 {
1330 .ctl_name = CTL_UNNUMBERED,
1331 .procname = "scan_unevictable_pages",
1332 .data = &scan_unevictable_pages,
1333 .maxlen = sizeof(scan_unevictable_pages),
1334 .mode = 0644,
1335 .proc_handler = &scan_unevictable_handler,
1336 },
1337 #endif
1338 /*
1339 * NOTE: do not add new entries to this table unless you have read
1340 * Documentation/sysctl/ctl_unnumbered.txt
1341 */
1342 { .ctl_name = 0 }
1343 };
1344
1345 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1346 static struct ctl_table binfmt_misc_table[] = {
1347 { .ctl_name = 0 }
1348 };
1349 #endif
1350
1351 static struct ctl_table fs_table[] = {
1352 {
1353 .ctl_name = FS_NRINODE,
1354 .procname = "inode-nr",
1355 .data = &inodes_stat,
1356 .maxlen = 2*sizeof(int),
1357 .mode = 0444,
1358 .proc_handler = &proc_dointvec,
1359 },
1360 {
1361 .ctl_name = FS_STATINODE,
1362 .procname = "inode-state",
1363 .data = &inodes_stat,
1364 .maxlen = 7*sizeof(int),
1365 .mode = 0444,
1366 .proc_handler = &proc_dointvec,
1367 },
1368 {
1369 .procname = "file-nr",
1370 .data = &files_stat,
1371 .maxlen = 3*sizeof(int),
1372 .mode = 0444,
1373 .proc_handler = &proc_nr_files,
1374 },
1375 {
1376 .ctl_name = FS_MAXFILE,
1377 .procname = "file-max",
1378 .data = &files_stat.max_files,
1379 .maxlen = sizeof(int),
1380 .mode = 0644,
1381 .proc_handler = &proc_dointvec,
1382 },
1383 {
1384 .ctl_name = CTL_UNNUMBERED,
1385 .procname = "nr_open",
1386 .data = &sysctl_nr_open,
1387 .maxlen = sizeof(int),
1388 .mode = 0644,
1389 .proc_handler = &proc_dointvec_minmax,
1390 .extra1 = &sysctl_nr_open_min,
1391 .extra2 = &sysctl_nr_open_max,
1392 },
1393 {
1394 .ctl_name = FS_DENTRY,
1395 .procname = "dentry-state",
1396 .data = &dentry_stat,
1397 .maxlen = 6*sizeof(int),
1398 .mode = 0444,
1399 .proc_handler = &proc_dointvec,
1400 },
1401 {
1402 .ctl_name = FS_OVERFLOWUID,
1403 .procname = "overflowuid",
1404 .data = &fs_overflowuid,
1405 .maxlen = sizeof(int),
1406 .mode = 0644,
1407 .proc_handler = &proc_dointvec_minmax,
1408 .strategy = &sysctl_intvec,
1409 .extra1 = &minolduid,
1410 .extra2 = &maxolduid,
1411 },
1412 {
1413 .ctl_name = FS_OVERFLOWGID,
1414 .procname = "overflowgid",
1415 .data = &fs_overflowgid,
1416 .maxlen = sizeof(int),
1417 .mode = 0644,
1418 .proc_handler = &proc_dointvec_minmax,
1419 .strategy = &sysctl_intvec,
1420 .extra1 = &minolduid,
1421 .extra2 = &maxolduid,
1422 },
1423 #ifdef CONFIG_FILE_LOCKING
1424 {
1425 .ctl_name = FS_LEASES,
1426 .procname = "leases-enable",
1427 .data = &leases_enable,
1428 .maxlen = sizeof(int),
1429 .mode = 0644,
1430 .proc_handler = &proc_dointvec,
1431 },
1432 #endif
1433 #ifdef CONFIG_DNOTIFY
1434 {
1435 .ctl_name = FS_DIR_NOTIFY,
1436 .procname = "dir-notify-enable",
1437 .data = &dir_notify_enable,
1438 .maxlen = sizeof(int),
1439 .mode = 0644,
1440 .proc_handler = &proc_dointvec,
1441 },
1442 #endif
1443 #ifdef CONFIG_MMU
1444 #ifdef CONFIG_FILE_LOCKING
1445 {
1446 .ctl_name = FS_LEASE_TIME,
1447 .procname = "lease-break-time",
1448 .data = &lease_break_time,
1449 .maxlen = sizeof(int),
1450 .mode = 0644,
1451 .proc_handler = &proc_dointvec,
1452 },
1453 #endif
1454 #ifdef CONFIG_AIO
1455 {
1456 .procname = "aio-nr",
1457 .data = &aio_nr,
1458 .maxlen = sizeof(aio_nr),
1459 .mode = 0444,
1460 .proc_handler = &proc_doulongvec_minmax,
1461 },
1462 {
1463 .procname = "aio-max-nr",
1464 .data = &aio_max_nr,
1465 .maxlen = sizeof(aio_max_nr),
1466 .mode = 0644,
1467 .proc_handler = &proc_doulongvec_minmax,
1468 },
1469 #endif /* CONFIG_AIO */
1470 #ifdef CONFIG_INOTIFY_USER
1471 {
1472 .ctl_name = FS_INOTIFY,
1473 .procname = "inotify",
1474 .mode = 0555,
1475 .child = inotify_table,
1476 },
1477 #endif
1478 #ifdef CONFIG_EPOLL
1479 {
1480 .procname = "epoll",
1481 .mode = 0555,
1482 .child = epoll_table,
1483 },
1484 #endif
1485 #endif
1486 {
1487 .ctl_name = KERN_SETUID_DUMPABLE,
1488 .procname = "suid_dumpable",
1489 .data = &suid_dumpable,
1490 .maxlen = sizeof(int),
1491 .mode = 0644,
1492 .proc_handler = &proc_dointvec_minmax,
1493 .strategy = &sysctl_intvec,
1494 .extra1 = &zero,
1495 .extra2 = &two,
1496 },
1497 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1498 {
1499 .ctl_name = CTL_UNNUMBERED,
1500 .procname = "binfmt_misc",
1501 .mode = 0555,
1502 .child = binfmt_misc_table,
1503 },
1504 #endif
1505 /*
1506 * NOTE: do not add new entries to this table unless you have read
1507 * Documentation/sysctl/ctl_unnumbered.txt
1508 */
1509 { .ctl_name = 0 }
1510 };
1511
1512 static struct ctl_table debug_table[] = {
1513 #if defined(CONFIG_X86) || defined(CONFIG_PPC)
1514 {
1515 .ctl_name = CTL_UNNUMBERED,
1516 .procname = "exception-trace",
1517 .data = &show_unhandled_signals,
1518 .maxlen = sizeof(int),
1519 .mode = 0644,
1520 .proc_handler = proc_dointvec
1521 },
1522 #endif
1523 { .ctl_name = 0 }
1524 };
1525
1526 static struct ctl_table dev_table[] = {
1527 { .ctl_name = 0 }
1528 };
1529
1530 static DEFINE_SPINLOCK(sysctl_lock);
1531
1532 /* called under sysctl_lock */
1533 static int use_table(struct ctl_table_header *p)
1534 {
1535 if (unlikely(p->unregistering))
1536 return 0;
1537 p->used++;
1538 return 1;
1539 }
1540
1541 /* called under sysctl_lock */
1542 static void unuse_table(struct ctl_table_header *p)
1543 {
1544 if (!--p->used)
1545 if (unlikely(p->unregistering))
1546 complete(p->unregistering);
1547 }
1548
1549 /* called under sysctl_lock, will reacquire if has to wait */
1550 static void start_unregistering(struct ctl_table_header *p)
1551 {
1552 /*
1553 * if p->used is 0, nobody will ever touch that entry again;
1554 * we'll eliminate all paths to it before dropping sysctl_lock
1555 */
1556 if (unlikely(p->used)) {
1557 struct completion wait;
1558 init_completion(&wait);
1559 p->unregistering = &wait;
1560 spin_unlock(&sysctl_lock);
1561 wait_for_completion(&wait);
1562 spin_lock(&sysctl_lock);
1563 } else {
1564 /* anything non-NULL; we'll never dereference it */
1565 p->unregistering = ERR_PTR(-EINVAL);
1566 }
1567 /*
1568 * do not remove from the list until nobody holds it; walking the
1569 * list in do_sysctl() relies on that.
1570 */
1571 list_del_init(&p->ctl_entry);
1572 }
1573
1574 void sysctl_head_get(struct ctl_table_header *head)
1575 {
1576 spin_lock(&sysctl_lock);
1577 head->count++;
1578 spin_unlock(&sysctl_lock);
1579 }
1580
1581 void sysctl_head_put(struct ctl_table_header *head)
1582 {
1583 spin_lock(&sysctl_lock);
1584 if (!--head->count)
1585 kfree(head);
1586 spin_unlock(&sysctl_lock);
1587 }
1588
1589 struct ctl_table_header *sysctl_head_grab(struct ctl_table_header *head)
1590 {
1591 if (!head)
1592 BUG();
1593 spin_lock(&sysctl_lock);
1594 if (!use_table(head))
1595 head = ERR_PTR(-ENOENT);
1596 spin_unlock(&sysctl_lock);
1597 return head;
1598 }
1599
1600 void sysctl_head_finish(struct ctl_table_header *head)
1601 {
1602 if (!head)
1603 return;
1604 spin_lock(&sysctl_lock);
1605 unuse_table(head);
1606 spin_unlock(&sysctl_lock);
1607 }
1608
1609 static struct ctl_table_set *
1610 lookup_header_set(struct ctl_table_root *root, struct nsproxy *namespaces)
1611 {
1612 struct ctl_table_set *set = &root->default_set;
1613 if (root->lookup)
1614 set = root->lookup(root, namespaces);
1615 return set;
1616 }
1617
1618 static struct list_head *
1619 lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces)
1620 {
1621 struct ctl_table_set *set = lookup_header_set(root, namespaces);
1622 return &set->list;
1623 }
1624
1625 struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces,
1626 struct ctl_table_header *prev)
1627 {
1628 struct ctl_table_root *root;
1629 struct list_head *header_list;
1630 struct ctl_table_header *head;
1631 struct list_head *tmp;
1632
1633 spin_lock(&sysctl_lock);
1634 if (prev) {
1635 head = prev;
1636 tmp = &prev->ctl_entry;
1637 unuse_table(prev);
1638 goto next;
1639 }
1640 tmp = &root_table_header.ctl_entry;
1641 for (;;) {
1642 head = list_entry(tmp, struct ctl_table_header, ctl_entry);
1643
1644 if (!use_table(head))
1645 goto next;
1646 spin_unlock(&sysctl_lock);
1647 return head;
1648 next:
1649 root = head->root;
1650 tmp = tmp->next;
1651 header_list = lookup_header_list(root, namespaces);
1652 if (tmp != header_list)
1653 continue;
1654
1655 do {
1656 root = list_entry(root->root_list.next,
1657 struct ctl_table_root, root_list);
1658 if (root == &sysctl_table_root)
1659 goto out;
1660 header_list = lookup_header_list(root, namespaces);
1661 } while (list_empty(header_list));
1662 tmp = header_list->next;
1663 }
1664 out:
1665 spin_unlock(&sysctl_lock);
1666 return NULL;
1667 }
1668
1669 struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev)
1670 {
1671 return __sysctl_head_next(current->nsproxy, prev);
1672 }
1673
1674 void register_sysctl_root(struct ctl_table_root *root)
1675 {
1676 spin_lock(&sysctl_lock);
1677 list_add_tail(&root->root_list, &sysctl_table_root.root_list);
1678 spin_unlock(&sysctl_lock);
1679 }
1680
1681 #ifdef CONFIG_SYSCTL_SYSCALL
1682 /* Perform the actual read/write of a sysctl table entry. */
1683 static int do_sysctl_strategy(struct ctl_table_root *root,
1684 struct ctl_table *table,
1685 void __user *oldval, size_t __user *oldlenp,
1686 void __user *newval, size_t newlen)
1687 {
1688 int op = 0, rc;
1689
1690 if (oldval)
1691 op |= MAY_READ;
1692 if (newval)
1693 op |= MAY_WRITE;
1694 if (sysctl_perm(root, table, op))
1695 return -EPERM;
1696
1697 if (table->strategy) {
1698 rc = table->strategy(table, oldval, oldlenp, newval, newlen);
1699 if (rc < 0)
1700 return rc;
1701 if (rc > 0)
1702 return 0;
1703 }
1704
1705 /* If there is no strategy routine, or if the strategy returns
1706 * zero, proceed with automatic r/w */
1707 if (table->data && table->maxlen) {
1708 rc = sysctl_data(table, oldval, oldlenp, newval, newlen);
1709 if (rc < 0)
1710 return rc;
1711 }
1712 return 0;
1713 }
1714
1715 static int parse_table(int __user *name, int nlen,
1716 void __user *oldval, size_t __user *oldlenp,
1717 void __user *newval, size_t newlen,
1718 struct ctl_table_root *root,
1719 struct ctl_table *table)
1720 {
1721 int n;
1722 repeat:
1723 if (!nlen)
1724 return -ENOTDIR;
1725 if (get_user(n, name))
1726 return -EFAULT;
1727 for ( ; table->ctl_name || table->procname; table++) {
1728 if (!table->ctl_name)
1729 continue;
1730 if (n == table->ctl_name) {
1731 int error;
1732 if (table->child) {
1733 if (sysctl_perm(root, table, MAY_EXEC))
1734 return -EPERM;
1735 name++;
1736 nlen--;
1737 table = table->child;
1738 goto repeat;
1739 }
1740 error = do_sysctl_strategy(root, table,
1741 oldval, oldlenp,
1742 newval, newlen);
1743 return error;
1744 }
1745 }
1746 return -ENOTDIR;
1747 }
1748
1749 int do_sysctl(int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp,
1750 void __user *newval, size_t newlen)
1751 {
1752 struct ctl_table_header *head;
1753 int error = -ENOTDIR;
1754
1755 if (nlen <= 0 || nlen >= CTL_MAXNAME)
1756 return -ENOTDIR;
1757 if (oldval) {
1758 int old_len;
1759 if (!oldlenp || get_user(old_len, oldlenp))
1760 return -EFAULT;
1761 }
1762
1763 for (head = sysctl_head_next(NULL); head;
1764 head = sysctl_head_next(head)) {
1765 error = parse_table(name, nlen, oldval, oldlenp,
1766 newval, newlen,
1767 head->root, head->ctl_table);
1768 if (error != -ENOTDIR) {
1769 sysctl_head_finish(head);
1770 break;
1771 }
1772 }
1773 return error;
1774 }
1775
1776 SYSCALL_DEFINE1(sysctl, struct __sysctl_args __user *, args)
1777 {
1778 struct __sysctl_args tmp;
1779 int error;
1780
1781 if (copy_from_user(&tmp, args, sizeof(tmp)))
1782 return -EFAULT;
1783
1784 error = deprecated_sysctl_warning(&tmp);
1785 if (error)
1786 goto out;
1787
1788 lock_kernel();
1789 error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp,
1790 tmp.newval, tmp.newlen);
1791 unlock_kernel();
1792 out:
1793 return error;
1794 }
1795 #endif /* CONFIG_SYSCTL_SYSCALL */
1796
1797 /*
1798 * sysctl_perm does NOT grant the superuser all rights automatically, because
1799 * some sysctl variables are readonly even to root.
1800 */
1801
1802 static int test_perm(int mode, int op)
1803 {
1804 if (!current_euid())
1805 mode >>= 6;
1806 else if (in_egroup_p(0))
1807 mode >>= 3;
1808 if ((op & ~mode & (MAY_READ|MAY_WRITE|MAY_EXEC)) == 0)
1809 return 0;
1810 return -EACCES;
1811 }
1812
1813 int sysctl_perm(struct ctl_table_root *root, struct ctl_table *table, int op)
1814 {
1815 int error;
1816 int mode;
1817
1818 error = security_sysctl(table, op & (MAY_READ | MAY_WRITE | MAY_EXEC));
1819 if (error)
1820 return error;
1821
1822 if (root->permissions)
1823 mode = root->permissions(root, current->nsproxy, table);
1824 else
1825 mode = table->mode;
1826
1827 return test_perm(mode, op);
1828 }
1829
1830 static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table)
1831 {
1832 for (; table->ctl_name || table->procname; table++) {
1833 table->parent = parent;
1834 if (table->child)
1835 sysctl_set_parent(table, table->child);
1836 }
1837 }
1838
1839 static __init int sysctl_init(void)
1840 {
1841 sysctl_set_parent(NULL, root_table);
1842 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK
1843 {
1844 int err;
1845 err = sysctl_check_table(current->nsproxy, root_table);
1846 }
1847 #endif
1848 return 0;
1849 }
1850
1851 core_initcall(sysctl_init);
1852
1853 static struct ctl_table *is_branch_in(struct ctl_table *branch,
1854 struct ctl_table *table)
1855 {
1856 struct ctl_table *p;
1857 const char *s = branch->procname;
1858
1859 /* branch should have named subdirectory as its first element */
1860 if (!s || !branch->child)
1861 return NULL;
1862
1863 /* ... and nothing else */
1864 if (branch[1].procname || branch[1].ctl_name)
1865 return NULL;
1866
1867 /* table should contain subdirectory with the same name */
1868 for (p = table; p->procname || p->ctl_name; p++) {
1869 if (!p->child)
1870 continue;
1871 if (p->procname && strcmp(p->procname, s) == 0)
1872 return p;
1873 }
1874 return NULL;
1875 }
1876
1877 /* see if attaching q to p would be an improvement */
1878 static void try_attach(struct ctl_table_header *p, struct ctl_table_header *q)
1879 {
1880 struct ctl_table *to = p->ctl_table, *by = q->ctl_table;
1881 struct ctl_table *next;
1882 int is_better = 0;
1883 int not_in_parent = !p->attached_by;
1884
1885 while ((next = is_branch_in(by, to)) != NULL) {
1886 if (by == q->attached_by)
1887 is_better = 1;
1888 if (to == p->attached_by)
1889 not_in_parent = 1;
1890 by = by->child;
1891 to = next->child;
1892 }
1893
1894 if (is_better && not_in_parent) {
1895 q->attached_by = by;
1896 q->attached_to = to;
1897 q->parent = p;
1898 }
1899 }
1900
1901 /**
1902 * __register_sysctl_paths - register a sysctl hierarchy
1903 * @root: List of sysctl headers to register on
1904 * @namespaces: Data to compute which lists of sysctl entries are visible
1905 * @path: The path to the directory the sysctl table is in.
1906 * @table: the top-level table structure
1907 *
1908 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1909 * array. A completely 0 filled entry terminates the table.
1910 *
1911 * The members of the &struct ctl_table structure are used as follows:
1912 *
1913 * ctl_name - This is the numeric sysctl value used by sysctl(2). The number
1914 * must be unique within that level of sysctl
1915 *
1916 * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1917 * enter a sysctl file
1918 *
1919 * data - a pointer to data for use by proc_handler
1920 *
1921 * maxlen - the maximum size in bytes of the data
1922 *
1923 * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1924 *
1925 * child - a pointer to the child sysctl table if this entry is a directory, or
1926 * %NULL.
1927 *
1928 * proc_handler - the text handler routine (described below)
1929 *
1930 * strategy - the strategy routine (described below)
1931 *
1932 * de - for internal use by the sysctl routines
1933 *
1934 * extra1, extra2 - extra pointers usable by the proc handler routines
1935 *
1936 * Leaf nodes in the sysctl tree will be represented by a single file
1937 * under /proc; non-leaf nodes will be represented by directories.
1938 *
1939 * sysctl(2) can automatically manage read and write requests through
1940 * the sysctl table. The data and maxlen fields of the ctl_table
1941 * struct enable minimal validation of the values being written to be
1942 * performed, and the mode field allows minimal authentication.
1943 *
1944 * More sophisticated management can be enabled by the provision of a
1945 * strategy routine with the table entry. This will be called before
1946 * any automatic read or write of the data is performed.
1947 *
1948 * The strategy routine may return
1949 *
1950 * < 0 - Error occurred (error is passed to user process)
1951 *
1952 * 0 - OK - proceed with automatic read or write.
1953 *
1954 * > 0 - OK - read or write has been done by the strategy routine, so
1955 * return immediately.
1956 *
1957 * There must be a proc_handler routine for any terminal nodes
1958 * mirrored under /proc/sys (non-terminals are handled by a built-in
1959 * directory handler). Several default handlers are available to
1960 * cover common cases -
1961 *
1962 * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
1963 * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(),
1964 * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
1965 *
1966 * It is the handler's job to read the input buffer from user memory
1967 * and process it. The handler should return 0 on success.
1968 *
1969 * This routine returns %NULL on a failure to register, and a pointer
1970 * to the table header on success.
1971 */
1972 struct ctl_table_header *__register_sysctl_paths(
1973 struct ctl_table_root *root,
1974 struct nsproxy *namespaces,
1975 const struct ctl_path *path, struct ctl_table *table)
1976 {
1977 struct ctl_table_header *header;
1978 struct ctl_table *new, **prevp;
1979 unsigned int n, npath;
1980 struct ctl_table_set *set;
1981
1982 /* Count the path components */
1983 for (npath = 0; path[npath].ctl_name || path[npath].procname; ++npath)
1984 ;
1985
1986 /*
1987 * For each path component, allocate a 2-element ctl_table array.
1988 * The first array element will be filled with the sysctl entry
1989 * for this, the second will be the sentinel (ctl_name == 0).
1990 *
1991 * We allocate everything in one go so that we don't have to
1992 * worry about freeing additional memory in unregister_sysctl_table.
1993 */
1994 header = kzalloc(sizeof(struct ctl_table_header) +
1995 (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL);
1996 if (!header)
1997 return NULL;
1998
1999 new = (struct ctl_table *) (header + 1);
2000
2001 /* Now connect the dots */
2002 prevp = &header->ctl_table;
2003 for (n = 0; n < npath; ++n, ++path) {
2004 /* Copy the procname */
2005 new->procname = path->procname;
2006 new->ctl_name = path->ctl_name;
2007 new->mode = 0555;
2008
2009 *prevp = new;
2010 prevp = &new->child;
2011
2012 new += 2;
2013 }
2014 *prevp = table;
2015 header->ctl_table_arg = table;
2016
2017 INIT_LIST_HEAD(&header->ctl_entry);
2018 header->used = 0;
2019 header->unregistering = NULL;
2020 header->root = root;
2021 sysctl_set_parent(NULL, header->ctl_table);
2022 header->count = 1;
2023 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK
2024 if (sysctl_check_table(namespaces, header->ctl_table)) {
2025 kfree(header);
2026 return NULL;
2027 }
2028 #endif
2029 spin_lock(&sysctl_lock);
2030 header->set = lookup_header_set(root, namespaces);
2031 header->attached_by = header->ctl_table;
2032 header->attached_to = root_table;
2033 header->parent = &root_table_header;
2034 for (set = header->set; set; set = set->parent) {
2035 struct ctl_table_header *p;
2036 list_for_each_entry(p, &set->list, ctl_entry) {
2037 if (p->unregistering)
2038 continue;
2039 try_attach(p, header);
2040 }
2041 }
2042 header->parent->count++;
2043 list_add_tail(&header->ctl_entry, &header->set->list);
2044 spin_unlock(&sysctl_lock);
2045
2046 return header;
2047 }
2048
2049 /**
2050 * register_sysctl_table_path - register a sysctl table hierarchy
2051 * @path: The path to the directory the sysctl table is in.
2052 * @table: the top-level table structure
2053 *
2054 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
2055 * array. A completely 0 filled entry terminates the table.
2056 *
2057 * See __register_sysctl_paths for more details.
2058 */
2059 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
2060 struct ctl_table *table)
2061 {
2062 return __register_sysctl_paths(&sysctl_table_root, current->nsproxy,
2063 path, table);
2064 }
2065
2066 /**
2067 * register_sysctl_table - register a sysctl table hierarchy
2068 * @table: the top-level table structure
2069 *
2070 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
2071 * array. A completely 0 filled entry terminates the table.
2072 *
2073 * See register_sysctl_paths for more details.
2074 */
2075 struct ctl_table_header *register_sysctl_table(struct ctl_table *table)
2076 {
2077 static const struct ctl_path null_path[] = { {} };
2078
2079 return register_sysctl_paths(null_path, table);
2080 }
2081
2082 /**
2083 * unregister_sysctl_table - unregister a sysctl table hierarchy
2084 * @header: the header returned from register_sysctl_table
2085 *
2086 * Unregisters the sysctl table and all children. proc entries may not
2087 * actually be removed until they are no longer used by anyone.
2088 */
2089 void unregister_sysctl_table(struct ctl_table_header * header)
2090 {
2091 might_sleep();
2092
2093 if (header == NULL)
2094 return;
2095
2096 spin_lock(&sysctl_lock);
2097 start_unregistering(header);
2098 if (!--header->parent->count) {
2099 WARN_ON(1);
2100 kfree(header->parent);
2101 }
2102 if (!--header->count)
2103 kfree(header);
2104 spin_unlock(&sysctl_lock);
2105 }
2106
2107 int sysctl_is_seen(struct ctl_table_header *p)
2108 {
2109 struct ctl_table_set *set = p->set;
2110 int res;
2111 spin_lock(&sysctl_lock);
2112 if (p->unregistering)
2113 res = 0;
2114 else if (!set->is_seen)
2115 res = 1;
2116 else
2117 res = set->is_seen(set);
2118 spin_unlock(&sysctl_lock);
2119 return res;
2120 }
2121
2122 void setup_sysctl_set(struct ctl_table_set *p,
2123 struct ctl_table_set *parent,
2124 int (*is_seen)(struct ctl_table_set *))
2125 {
2126 INIT_LIST_HEAD(&p->list);
2127 p->parent = parent ? parent : &sysctl_table_root.default_set;
2128 p->is_seen = is_seen;
2129 }
2130
2131 #else /* !CONFIG_SYSCTL */
2132 struct ctl_table_header *register_sysctl_table(struct ctl_table * table)
2133 {
2134 return NULL;
2135 }
2136
2137 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
2138 struct ctl_table *table)
2139 {
2140 return NULL;
2141 }
2142
2143 void unregister_sysctl_table(struct ctl_table_header * table)
2144 {
2145 }
2146
2147 void setup_sysctl_set(struct ctl_table_set *p,
2148 struct ctl_table_set *parent,
2149 int (*is_seen)(struct ctl_table_set *))
2150 {
2151 }
2152
2153 void sysctl_head_put(struct ctl_table_header *head)
2154 {
2155 }
2156
2157 #endif /* CONFIG_SYSCTL */
2158
2159 /*
2160 * /proc/sys support
2161 */
2162
2163 #ifdef CONFIG_PROC_SYSCTL
2164
2165 static int _proc_do_string(void* data, int maxlen, int write,
2166 struct file *filp, void __user *buffer,
2167 size_t *lenp, loff_t *ppos)
2168 {
2169 size_t len;
2170 char __user *p;
2171 char c;
2172
2173 if (!data || !maxlen || !*lenp) {
2174 *lenp = 0;
2175 return 0;
2176 }
2177
2178 if (write) {
2179 len = 0;
2180 p = buffer;
2181 while (len < *lenp) {
2182 if (get_user(c, p++))
2183 return -EFAULT;
2184 if (c == 0 || c == '\n')
2185 break;
2186 len++;
2187 }
2188 if (len >= maxlen)
2189 len = maxlen-1;
2190 if(copy_from_user(data, buffer, len))
2191 return -EFAULT;
2192 ((char *) data)[len] = 0;
2193 *ppos += *lenp;
2194 } else {
2195 len = strlen(data);
2196 if (len > maxlen)
2197 len = maxlen;
2198
2199 if (*ppos > len) {
2200 *lenp = 0;
2201 return 0;
2202 }
2203
2204 data += *ppos;
2205 len -= *ppos;
2206
2207 if (len > *lenp)
2208 len = *lenp;
2209 if (len)
2210 if(copy_to_user(buffer, data, len))
2211 return -EFAULT;
2212 if (len < *lenp) {
2213 if(put_user('\n', ((char __user *) buffer) + len))
2214 return -EFAULT;
2215 len++;
2216 }
2217 *lenp = len;
2218 *ppos += len;
2219 }
2220 return 0;
2221 }
2222
2223 /**
2224 * proc_dostring - read a string sysctl
2225 * @table: the sysctl table
2226 * @write: %TRUE if this is a write to the sysctl file
2227 * @filp: the file structure
2228 * @buffer: the user buffer
2229 * @lenp: the size of the user buffer
2230 * @ppos: file position
2231 *
2232 * Reads/writes a string from/to the user buffer. If the kernel
2233 * buffer provided is not large enough to hold the string, the
2234 * string is truncated. The copied string is %NULL-terminated.
2235 * If the string is being read by the user process, it is copied
2236 * and a newline '\n' is added. It is truncated if the buffer is
2237 * not large enough.
2238 *
2239 * Returns 0 on success.
2240 */
2241 int proc_dostring(struct ctl_table *table, int write, struct file *filp,
2242 void __user *buffer, size_t *lenp, loff_t *ppos)
2243 {
2244 return _proc_do_string(table->data, table->maxlen, write, filp,
2245 buffer, lenp, ppos);
2246 }
2247
2248
2249 static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp,
2250 int *valp,
2251 int write, void *data)
2252 {
2253 if (write) {
2254 *valp = *negp ? -*lvalp : *lvalp;
2255 } else {
2256 int val = *valp;
2257 if (val < 0) {
2258 *negp = -1;
2259 *lvalp = (unsigned long)-val;
2260 } else {
2261 *negp = 0;
2262 *lvalp = (unsigned long)val;
2263 }
2264 }
2265 return 0;
2266 }
2267
2268 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
2269 int write, struct file *filp, void __user *buffer,
2270 size_t *lenp, loff_t *ppos,
2271 int (*conv)(int *negp, unsigned long *lvalp, int *valp,
2272 int write, void *data),
2273 void *data)
2274 {
2275 #define TMPBUFLEN 21
2276 int *i, vleft, first=1, neg, val;
2277 unsigned long lval;
2278 size_t left, len;
2279
2280 char buf[TMPBUFLEN], *p;
2281 char __user *s = buffer;
2282
2283 if (!tbl_data || !table->maxlen || !*lenp ||
2284 (*ppos && !write)) {
2285 *lenp = 0;
2286 return 0;
2287 }
2288
2289 i = (int *) tbl_data;
2290 vleft = table->maxlen / sizeof(*i);
2291 left = *lenp;
2292
2293 if (!conv)
2294 conv = do_proc_dointvec_conv;
2295
2296 for (; left && vleft--; i++, first=0) {
2297 if (write) {
2298 while (left) {
2299 char c;
2300 if (get_user(c, s))
2301 return -EFAULT;
2302 if (!isspace(c))
2303 break;
2304 left--;
2305 s++;
2306 }
2307 if (!left)
2308 break;
2309 neg = 0;
2310 len = left;
2311 if (len > sizeof(buf) - 1)
2312 len = sizeof(buf) - 1;
2313 if (copy_from_user(buf, s, len))
2314 return -EFAULT;
2315 buf[len] = 0;
2316 p = buf;
2317 if (*p == '-' && left > 1) {
2318 neg = 1;
2319 p++;
2320 }
2321 if (*p < '0' || *p > '9')
2322 break;
2323
2324 lval = simple_strtoul(p, &p, 0);
2325
2326 len = p-buf;
2327 if ((len < left) && *p && !isspace(*p))
2328 break;
2329 if (neg)
2330 val = -val;
2331 s += len;
2332 left -= len;
2333
2334 if (conv(&neg, &lval, i, 1, data))
2335 break;
2336 } else {
2337 p = buf;
2338 if (!first)
2339 *p++ = '\t';
2340
2341 if (conv(&neg, &lval, i, 0, data))
2342 break;
2343
2344 sprintf(p, "%s%lu", neg ? "-" : "", lval);
2345 len = strlen(buf);
2346 if (len > left)
2347 len = left;
2348 if(copy_to_user(s, buf, len))
2349 return -EFAULT;
2350 left -= len;
2351 s += len;
2352 }
2353 }
2354
2355 if (!write && !first && left) {
2356 if(put_user('\n', s))
2357 return -EFAULT;
2358 left--, s++;
2359 }
2360 if (write) {
2361 while (left) {
2362 char c;
2363 if (get_user(c, s++))
2364 return -EFAULT;
2365 if (!isspace(c))
2366 break;
2367 left--;
2368 }
2369 }
2370 if (write && first)
2371 return -EINVAL;
2372 *lenp -= left;
2373 *ppos += *lenp;
2374 return 0;
2375 #undef TMPBUFLEN
2376 }
2377
2378 static int do_proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2379 void __user *buffer, size_t *lenp, loff_t *ppos,
2380 int (*conv)(int *negp, unsigned long *lvalp, int *valp,
2381 int write, void *data),
2382 void *data)
2383 {
2384 return __do_proc_dointvec(table->data, table, write, filp,
2385 buffer, lenp, ppos, conv, data);
2386 }
2387
2388 /**
2389 * proc_dointvec - read a vector of integers
2390 * @table: the sysctl table
2391 * @write: %TRUE if this is a write to the sysctl file
2392 * @filp: the file structure
2393 * @buffer: the user buffer
2394 * @lenp: the size of the user buffer
2395 * @ppos: file position
2396 *
2397 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2398 * values from/to the user buffer, treated as an ASCII string.
2399 *
2400 * Returns 0 on success.
2401 */
2402 int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2403 void __user *buffer, size_t *lenp, loff_t *ppos)
2404 {
2405 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2406 NULL,NULL);
2407 }
2408
2409 /*
2410 * Taint values can only be increased
2411 * This means we can safely use a temporary.
2412 */
2413 static int proc_taint(struct ctl_table *table, int write, struct file *filp,
2414 void __user *buffer, size_t *lenp, loff_t *ppos)
2415 {
2416 struct ctl_table t;
2417 unsigned long tmptaint = get_taint();
2418 int err;
2419
2420 if (write && !capable(CAP_SYS_ADMIN))
2421 return -EPERM;
2422
2423 t = *table;
2424 t.data = &tmptaint;
2425 err = proc_doulongvec_minmax(&t, write, filp, buffer, lenp, ppos);
2426 if (err < 0)
2427 return err;
2428
2429 if (write) {
2430 /*
2431 * Poor man's atomic or. Not worth adding a primitive
2432 * to everyone's atomic.h for this
2433 */
2434 int i;
2435 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2436 if ((tmptaint >> i) & 1)
2437 add_taint(i);
2438 }
2439 }
2440
2441 return err;
2442 }
2443
2444 struct do_proc_dointvec_minmax_conv_param {
2445 int *min;
2446 int *max;
2447 };
2448
2449 static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp,
2450 int *valp,
2451 int write, void *data)
2452 {
2453 struct do_proc_dointvec_minmax_conv_param *param = data;
2454 if (write) {
2455 int val = *negp ? -*lvalp : *lvalp;
2456 if ((param->min && *param->min > val) ||
2457 (param->max && *param->max < val))
2458 return -EINVAL;
2459 *valp = val;
2460 } else {
2461 int val = *valp;
2462 if (val < 0) {
2463 *negp = -1;
2464 *lvalp = (unsigned long)-val;
2465 } else {
2466 *negp = 0;
2467 *lvalp = (unsigned long)val;
2468 }
2469 }
2470 return 0;
2471 }
2472
2473 /**
2474 * proc_dointvec_minmax - read a vector of integers with min/max values
2475 * @table: the sysctl table
2476 * @write: %TRUE if this is a write to the sysctl file
2477 * @filp: the file structure
2478 * @buffer: the user buffer
2479 * @lenp: the size of the user buffer
2480 * @ppos: file position
2481 *
2482 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2483 * values from/to the user buffer, treated as an ASCII string.
2484 *
2485 * This routine will ensure the values are within the range specified by
2486 * table->extra1 (min) and table->extra2 (max).
2487 *
2488 * Returns 0 on success.
2489 */
2490 int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
2491 void __user *buffer, size_t *lenp, loff_t *ppos)
2492 {
2493 struct do_proc_dointvec_minmax_conv_param param = {
2494 .min = (int *) table->extra1,
2495 .max = (int *) table->extra2,
2496 };
2497 return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2498 do_proc_dointvec_minmax_conv, &param);
2499 }
2500
2501 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2502 struct file *filp,
2503 void __user *buffer,
2504 size_t *lenp, loff_t *ppos,
2505 unsigned long convmul,
2506 unsigned long convdiv)
2507 {
2508 #define TMPBUFLEN 21
2509 unsigned long *i, *min, *max, val;
2510 int vleft, first=1, neg;
2511 size_t len, left;
2512 char buf[TMPBUFLEN], *p;
2513 char __user *s = buffer;
2514
2515 if (!data || !table->maxlen || !*lenp ||
2516 (*ppos && !write)) {
2517 *lenp = 0;
2518 return 0;
2519 }
2520
2521 i = (unsigned long *) data;
2522 min = (unsigned long *) table->extra1;
2523 max = (unsigned long *) table->extra2;
2524 vleft = table->maxlen / sizeof(unsigned long);
2525 left = *lenp;
2526
2527 for (; left && vleft--; i++, min++, max++, first=0) {
2528 if (write) {
2529 while (left) {
2530 char c;
2531 if (get_user(c, s))
2532 return -EFAULT;
2533 if (!isspace(c))
2534 break;
2535 left--;
2536 s++;
2537 }
2538 if (!left)
2539 break;
2540 neg = 0;
2541 len = left;
2542 if (len > TMPBUFLEN-1)
2543 len = TMPBUFLEN-1;
2544 if (copy_from_user(buf, s, len))
2545 return -EFAULT;
2546 buf[len] = 0;
2547 p = buf;
2548 if (*p == '-' && left > 1) {
2549 neg = 1;
2550 p++;
2551 }
2552 if (*p < '0' || *p > '9')
2553 break;
2554 val = simple_strtoul(p, &p, 0) * convmul / convdiv ;
2555 len = p-buf;
2556 if ((len < left) && *p && !isspace(*p))
2557 break;
2558 if (neg)
2559 val = -val;
2560 s += len;
2561 left -= len;
2562
2563 if(neg)
2564 continue;
2565 if ((min && val < *min) || (max && val > *max))
2566 continue;
2567 *i = val;
2568 } else {
2569 p = buf;
2570 if (!first)
2571 *p++ = '\t';
2572 sprintf(p, "%lu", convdiv * (*i) / convmul);
2573 len = strlen(buf);
2574 if (len > left)
2575 len = left;
2576 if(copy_to_user(s, buf, len))
2577 return -EFAULT;
2578 left -= len;
2579 s += len;
2580 }
2581 }
2582
2583 if (!write && !first && left) {
2584 if(put_user('\n', s))
2585 return -EFAULT;
2586 left--, s++;
2587 }
2588 if (write) {
2589 while (left) {
2590 char c;
2591 if (get_user(c, s++))
2592 return -EFAULT;
2593 if (!isspace(c))
2594 break;
2595 left--;
2596 }
2597 }
2598 if (write && first)
2599 return -EINVAL;
2600 *lenp -= left;
2601 *ppos += *lenp;
2602 return 0;
2603 #undef TMPBUFLEN
2604 }
2605
2606 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2607 struct file *filp,
2608 void __user *buffer,
2609 size_t *lenp, loff_t *ppos,
2610 unsigned long convmul,
2611 unsigned long convdiv)
2612 {
2613 return __do_proc_doulongvec_minmax(table->data, table, write,
2614 filp, buffer, lenp, ppos, convmul, convdiv);
2615 }
2616
2617 /**
2618 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2619 * @table: the sysctl table
2620 * @write: %TRUE if this is a write to the sysctl file
2621 * @filp: the file structure
2622 * @buffer: the user buffer
2623 * @lenp: the size of the user buffer
2624 * @ppos: file position
2625 *
2626 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2627 * values from/to the user buffer, treated as an ASCII string.
2628 *
2629 * This routine will ensure the values are within the range specified by
2630 * table->extra1 (min) and table->extra2 (max).
2631 *
2632 * Returns 0 on success.
2633 */
2634 int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
2635 void __user *buffer, size_t *lenp, loff_t *ppos)
2636 {
2637 return do_proc_doulongvec_minmax(table, write, filp, buffer, lenp, ppos, 1l, 1l);
2638 }
2639
2640 /**
2641 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2642 * @table: the sysctl table
2643 * @write: %TRUE if this is a write to the sysctl file
2644 * @filp: the file structure
2645 * @buffer: the user buffer
2646 * @lenp: the size of the user buffer
2647 * @ppos: file position
2648 *
2649 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2650 * values from/to the user buffer, treated as an ASCII string. The values
2651 * are treated as milliseconds, and converted to jiffies when they are stored.
2652 *
2653 * This routine will ensure the values are within the range specified by
2654 * table->extra1 (min) and table->extra2 (max).
2655 *
2656 * Returns 0 on success.
2657 */
2658 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2659 struct file *filp,
2660 void __user *buffer,
2661 size_t *lenp, loff_t *ppos)
2662 {
2663 return do_proc_doulongvec_minmax(table, write, filp, buffer,
2664 lenp, ppos, HZ, 1000l);
2665 }
2666
2667
2668 static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp,
2669 int *valp,
2670 int write, void *data)
2671 {
2672 if (write) {
2673 if (*lvalp > LONG_MAX / HZ)
2674 return 1;
2675 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2676 } else {
2677 int val = *valp;
2678 unsigned long lval;
2679 if (val < 0) {
2680 *negp = -1;
2681 lval = (unsigned long)-val;
2682 } else {
2683 *negp = 0;
2684 lval = (unsigned long)val;
2685 }
2686 *lvalp = lval / HZ;
2687 }
2688 return 0;
2689 }
2690
2691 static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp,
2692 int *valp,
2693 int write, void *data)
2694 {
2695 if (write) {
2696 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2697 return 1;
2698 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2699 } else {
2700 int val = *valp;
2701 unsigned long lval;
2702 if (val < 0) {
2703 *negp = -1;
2704 lval = (unsigned long)-val;
2705 } else {
2706 *negp = 0;
2707 lval = (unsigned long)val;
2708 }
2709 *lvalp = jiffies_to_clock_t(lval);
2710 }
2711 return 0;
2712 }
2713
2714 static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp,
2715 int *valp,
2716 int write, void *data)
2717 {
2718 if (write) {
2719 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2720 } else {
2721 int val = *valp;
2722 unsigned long lval;
2723 if (val < 0) {
2724 *negp = -1;
2725 lval = (unsigned long)-val;
2726 } else {
2727 *negp = 0;
2728 lval = (unsigned long)val;
2729 }
2730 *lvalp = jiffies_to_msecs(lval);
2731 }
2732 return 0;
2733 }
2734
2735 /**
2736 * proc_dointvec_jiffies - read a vector of integers as seconds
2737 * @table: the sysctl table
2738 * @write: %TRUE if this is a write to the sysctl file
2739 * @filp: the file structure
2740 * @buffer: the user buffer
2741 * @lenp: the size of the user buffer
2742 * @ppos: file position
2743 *
2744 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2745 * values from/to the user buffer, treated as an ASCII string.
2746 * The values read are assumed to be in seconds, and are converted into
2747 * jiffies.
2748 *
2749 * Returns 0 on success.
2750 */
2751 int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
2752 void __user *buffer, size_t *lenp, loff_t *ppos)
2753 {
2754 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2755 do_proc_dointvec_jiffies_conv,NULL);
2756 }
2757
2758 /**
2759 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2760 * @table: the sysctl table
2761 * @write: %TRUE if this is a write to the sysctl file
2762 * @filp: the file structure
2763 * @buffer: the user buffer
2764 * @lenp: the size of the user buffer
2765 * @ppos: pointer to the file position
2766 *
2767 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2768 * values from/to the user buffer, treated as an ASCII string.
2769 * The values read are assumed to be in 1/USER_HZ seconds, and
2770 * are converted into jiffies.
2771 *
2772 * Returns 0 on success.
2773 */
2774 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
2775 void __user *buffer, size_t *lenp, loff_t *ppos)
2776 {
2777 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2778 do_proc_dointvec_userhz_jiffies_conv,NULL);
2779 }
2780
2781 /**
2782 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2783 * @table: the sysctl table
2784 * @write: %TRUE if this is a write to the sysctl file
2785 * @filp: the file structure
2786 * @buffer: the user buffer
2787 * @lenp: the size of the user buffer
2788 * @ppos: file position
2789 * @ppos: the current position in the file
2790 *
2791 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2792 * values from/to the user buffer, treated as an ASCII string.
2793 * The values read are assumed to be in 1/1000 seconds, and
2794 * are converted into jiffies.
2795 *
2796 * Returns 0 on success.
2797 */
2798 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
2799 void __user *buffer, size_t *lenp, loff_t *ppos)
2800 {
2801 return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2802 do_proc_dointvec_ms_jiffies_conv, NULL);
2803 }
2804
2805 static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
2806 void __user *buffer, size_t *lenp, loff_t *ppos)
2807 {
2808 struct pid *new_pid;
2809 pid_t tmp;
2810 int r;
2811
2812 tmp = pid_vnr(cad_pid);
2813
2814 r = __do_proc_dointvec(&tmp, table, write, filp, buffer,
2815 lenp, ppos, NULL, NULL);
2816 if (r || !write)
2817 return r;
2818
2819 new_pid = find_get_pid(tmp);
2820 if (!new_pid)
2821 return -ESRCH;
2822
2823 put_pid(xchg(&cad_pid, new_pid));
2824 return 0;
2825 }
2826
2827 #else /* CONFIG_PROC_FS */
2828
2829 int proc_dostring(struct ctl_table *table, int write, struct file *filp,
2830 void __user *buffer, size_t *lenp, loff_t *ppos)
2831 {
2832 return -ENOSYS;
2833 }
2834
2835 int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2836 void __user *buffer, size_t *lenp, loff_t *ppos)
2837 {
2838 return -ENOSYS;
2839 }
2840
2841 int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
2842 void __user *buffer, size_t *lenp, loff_t *ppos)
2843 {
2844 return -ENOSYS;
2845 }
2846
2847 int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
2848 void __user *buffer, size_t *lenp, loff_t *ppos)
2849 {
2850 return -ENOSYS;
2851 }
2852
2853 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
2854 void __user *buffer, size_t *lenp, loff_t *ppos)
2855 {
2856 return -ENOSYS;
2857 }
2858
2859 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
2860 void __user *buffer, size_t *lenp, loff_t *ppos)
2861 {
2862 return -ENOSYS;
2863 }
2864
2865 int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
2866 void __user *buffer, size_t *lenp, loff_t *ppos)
2867 {
2868 return -ENOSYS;
2869 }
2870
2871 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2872 struct file *filp,
2873 void __user *buffer,
2874 size_t *lenp, loff_t *ppos)
2875 {
2876 return -ENOSYS;
2877 }
2878
2879
2880 #endif /* CONFIG_PROC_FS */
2881
2882
2883 #ifdef CONFIG_SYSCTL_SYSCALL
2884 /*
2885 * General sysctl support routines
2886 */
2887
2888 /* The generic sysctl data routine (used if no strategy routine supplied) */
2889 int sysctl_data(struct ctl_table *table,
2890 void __user *oldval, size_t __user *oldlenp,
2891 void __user *newval, size_t newlen)
2892 {
2893 size_t len;
2894
2895 /* Get out of I don't have a variable */
2896 if (!table->data || !table->maxlen)
2897 return -ENOTDIR;
2898
2899 if (oldval && oldlenp) {
2900 if (get_user(len, oldlenp))
2901 return -EFAULT;
2902 if (len) {
2903 if (len > table->maxlen)
2904 len = table->maxlen;
2905 if (copy_to_user(oldval, table->data, len))
2906 return -EFAULT;
2907 if (put_user(len, oldlenp))
2908 return -EFAULT;
2909 }
2910 }
2911
2912 if (newval && newlen) {
2913 if (newlen > table->maxlen)
2914 newlen = table->maxlen;
2915
2916 if (copy_from_user(table->data, newval, newlen))
2917 return -EFAULT;
2918 }
2919 return 1;
2920 }
2921
2922 /* The generic string strategy routine: */
2923 int sysctl_string(struct ctl_table *table,
2924 void __user *oldval, size_t __user *oldlenp,
2925 void __user *newval, size_t newlen)
2926 {
2927 if (!table->data || !table->maxlen)
2928 return -ENOTDIR;
2929
2930 if (oldval && oldlenp) {
2931 size_t bufsize;
2932 if (get_user(bufsize, oldlenp))
2933 return -EFAULT;
2934 if (bufsize) {
2935 size_t len = strlen(table->data), copied;
2936
2937 /* This shouldn't trigger for a well-formed sysctl */
2938 if (len > table->maxlen)
2939 len = table->maxlen;
2940
2941 /* Copy up to a max of bufsize-1 bytes of the string */
2942 copied = (len >= bufsize) ? bufsize - 1 : len;
2943
2944 if (copy_to_user(oldval, table->data, copied) ||
2945 put_user(0, (char __user *)(oldval + copied)))
2946 return -EFAULT;
2947 if (put_user(len, oldlenp))
2948 return -EFAULT;
2949 }
2950 }
2951 if (newval && newlen) {
2952 size_t len = newlen;
2953 if (len > table->maxlen)
2954 len = table->maxlen;
2955 if(copy_from_user(table->data, newval, len))
2956 return -EFAULT;
2957 if (len == table->maxlen)
2958 len--;
2959 ((char *) table->data)[len] = 0;
2960 }
2961 return 1;
2962 }
2963
2964 /*
2965 * This function makes sure that all of the integers in the vector
2966 * are between the minimum and maximum values given in the arrays
2967 * table->extra1 and table->extra2, respectively.
2968 */
2969 int sysctl_intvec(struct ctl_table *table,
2970 void __user *oldval, size_t __user *oldlenp,
2971 void __user *newval, size_t newlen)
2972 {
2973
2974 if (newval && newlen) {
2975 int __user *vec = (int __user *) newval;
2976 int *min = (int *) table->extra1;
2977 int *max = (int *) table->extra2;
2978 size_t length;
2979 int i;
2980
2981 if (newlen % sizeof(int) != 0)
2982 return -EINVAL;
2983
2984 if (!table->extra1 && !table->extra2)
2985 return 0;
2986
2987 if (newlen > table->maxlen)
2988 newlen = table->maxlen;
2989 length = newlen / sizeof(int);
2990
2991 for (i = 0; i < length; i++) {
2992 int value;
2993 if (get_user(value, vec + i))
2994 return -EFAULT;
2995 if (min && value < min[i])
2996 return -EINVAL;
2997 if (max && value > max[i])
2998 return -EINVAL;
2999 }
3000 }
3001 return 0;
3002 }
3003
3004 /* Strategy function to convert jiffies to seconds */
3005 int sysctl_jiffies(struct ctl_table *table,
3006 void __user *oldval, size_t __user *oldlenp,
3007 void __user *newval, size_t newlen)
3008 {
3009 if (oldval && oldlenp) {
3010 size_t olen;
3011
3012 if (get_user(olen, oldlenp))
3013 return -EFAULT;
3014 if (olen) {
3015 int val;
3016
3017 if (olen < sizeof(int))
3018 return -EINVAL;
3019
3020 val = *(int *)(table->data) / HZ;
3021 if (put_user(val, (int __user *)oldval))
3022 return -EFAULT;
3023 if (put_user(sizeof(int), oldlenp))
3024 return -EFAULT;
3025 }
3026 }
3027 if (newval && newlen) {
3028 int new;
3029 if (newlen != sizeof(int))
3030 return -EINVAL;
3031 if (get_user(new, (int __user *)newval))
3032 return -EFAULT;
3033 *(int *)(table->data) = new*HZ;
3034 }
3035 return 1;
3036 }
3037
3038 /* Strategy function to convert jiffies to seconds */
3039 int sysctl_ms_jiffies(struct ctl_table *table,
3040 void __user *oldval, size_t __user *oldlenp,
3041 void __user *newval, size_t newlen)
3042 {
3043 if (oldval && oldlenp) {
3044 size_t olen;
3045
3046 if (get_user(olen, oldlenp))
3047 return -EFAULT;
3048 if (olen) {
3049 int val;
3050
3051 if (olen < sizeof(int))
3052 return -EINVAL;
3053
3054 val = jiffies_to_msecs(*(int *)(table->data));
3055 if (put_user(val, (int __user *)oldval))
3056 return -EFAULT;
3057 if (put_user(sizeof(int), oldlenp))
3058 return -EFAULT;
3059 }
3060 }
3061 if (newval && newlen) {
3062 int new;
3063 if (newlen != sizeof(int))
3064 return -EINVAL;
3065 if (get_user(new, (int __user *)newval))
3066 return -EFAULT;
3067 *(int *)(table->data) = msecs_to_jiffies(new);
3068 }
3069 return 1;
3070 }
3071
3072
3073
3074 #else /* CONFIG_SYSCTL_SYSCALL */
3075
3076
3077 SYSCALL_DEFINE1(sysctl, struct __sysctl_args __user *, args)
3078 {
3079 struct __sysctl_args tmp;
3080 int error;
3081
3082 if (copy_from_user(&tmp, args, sizeof(tmp)))
3083 return -EFAULT;
3084
3085 error = deprecated_sysctl_warning(&tmp);
3086
3087 /* If no error reading the parameters then just -ENOSYS ... */
3088 if (!error)
3089 error = -ENOSYS;
3090
3091 return error;
3092 }
3093
3094 int sysctl_data(struct ctl_table *table,
3095 void __user *oldval, size_t __user *oldlenp,
3096 void __user *newval, size_t newlen)
3097 {
3098 return -ENOSYS;
3099 }
3100
3101 int sysctl_string(struct ctl_table *table,
3102 void __user *oldval, size_t __user *oldlenp,
3103 void __user *newval, size_t newlen)
3104 {
3105 return -ENOSYS;
3106 }
3107
3108 int sysctl_intvec(struct ctl_table *table,
3109 void __user *oldval, size_t __user *oldlenp,
3110 void __user *newval, size_t newlen)
3111 {
3112 return -ENOSYS;
3113 }
3114
3115 int sysctl_jiffies(struct ctl_table *table,
3116 void __user *oldval, size_t __user *oldlenp,
3117 void __user *newval, size_t newlen)
3118 {
3119 return -ENOSYS;
3120 }
3121
3122 int sysctl_ms_jiffies(struct ctl_table *table,
3123 void __user *oldval, size_t __user *oldlenp,
3124 void __user *newval, size_t newlen)
3125 {
3126 return -ENOSYS;
3127 }
3128
3129 #endif /* CONFIG_SYSCTL_SYSCALL */
3130
3131 static int deprecated_sysctl_warning(struct __sysctl_args *args)
3132 {
3133 static int msg_count;
3134 int name[CTL_MAXNAME];
3135 int i;
3136
3137 /* Check args->nlen. */
3138 if (args->nlen < 0 || args->nlen > CTL_MAXNAME)
3139 return -ENOTDIR;
3140
3141 /* Read in the sysctl name for better debug message logging */
3142 for (i = 0; i < args->nlen; i++)
3143 if (get_user(name[i], args->name + i))
3144 return -EFAULT;
3145
3146 /* Ignore accesses to kernel.version */
3147 if ((args->nlen == 2) && (name[0] == CTL_KERN) && (name[1] == KERN_VERSION))
3148 return 0;
3149
3150 if (msg_count < 5) {
3151 msg_count++;
3152 printk(KERN_INFO
3153 "warning: process `%s' used the deprecated sysctl "
3154 "system call with ", current->comm);
3155 for (i = 0; i < args->nlen; i++)
3156 printk("%d.", name[i]);
3157 printk("\n");
3158 }
3159 return 0;
3160 }
3161
3162 /*
3163 * No sense putting this after each symbol definition, twice,
3164 * exception granted :-)
3165 */
3166 EXPORT_SYMBOL(proc_dointvec);
3167 EXPORT_SYMBOL(proc_dointvec_jiffies);
3168 EXPORT_SYMBOL(proc_dointvec_minmax);
3169 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
3170 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
3171 EXPORT_SYMBOL(proc_dostring);
3172 EXPORT_SYMBOL(proc_doulongvec_minmax);
3173 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
3174 EXPORT_SYMBOL(register_sysctl_table);
3175 EXPORT_SYMBOL(register_sysctl_paths);
3176 EXPORT_SYMBOL(sysctl_intvec);
3177 EXPORT_SYMBOL(sysctl_jiffies);
3178 EXPORT_SYMBOL(sysctl_ms_jiffies);
3179 EXPORT_SYMBOL(sysctl_string);
3180 EXPORT_SYMBOL(sysctl_data);
3181 EXPORT_SYMBOL(unregister_sysctl_table);
Linux kernel - Deliverables
This page took 0.096189 seconds and 5 git commands to generate.