projects / deliverable / linux.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
x86: Add sysctl to allow panic on IOCK NMI error
[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/kmemcheck.h>
31 #include <linux/smp_lock.h>
32 #include <linux/fs.h>
33 #include <linux/init.h>
34 #include <linux/kernel.h>
35 #include <linux/kobject.h>
36 #include <linux/net.h>
37 #include <linux/sysrq.h>
38 #include <linux/highuid.h>
39 #include <linux/writeback.h>
40 #include <linux/hugetlb.h>
41 #include <linux/initrd.h>
42 #include <linux/key.h>
43 #include <linux/times.h>
44 #include <linux/limits.h>
45 #include <linux/dcache.h>
46 #include <linux/syscalls.h>
47 #include <linux/vmstat.h>
48 #include <linux/nfs_fs.h>
49 #include <linux/acpi.h>
50 #include <linux/reboot.h>
51 #include <linux/ftrace.h>
52 #include <linux/slow-work.h>
53 #include <linux/perf_counter.h>
54
55 #include <asm/uaccess.h>
56 #include <asm/processor.h>
57
58 #ifdef CONFIG_X86
59 #include <asm/nmi.h>
60 #include <asm/stacktrace.h>
61 #include <asm/io.h>
62 #endif
63
64 static int deprecated_sysctl_warning(struct __sysctl_args *args);
65
66 #if defined(CONFIG_SYSCTL)
67
68 /* External variables not in a header file. */
69 extern int C_A_D;
70 extern int print_fatal_signals;
71 extern int sysctl_overcommit_memory;
72 extern int sysctl_overcommit_ratio;
73 extern int sysctl_panic_on_oom;
74 extern int sysctl_oom_kill_allocating_task;
75 extern int sysctl_oom_dump_tasks;
76 extern int max_threads;
77 extern int core_uses_pid;
78 extern int suid_dumpable;
79 extern char core_pattern[];
80 extern int pid_max;
81 extern int min_free_kbytes;
82 extern int pid_max_min, pid_max_max;
83 extern int sysctl_drop_caches;
84 extern int percpu_pagelist_fraction;
85 extern int compat_log;
86 extern int latencytop_enabled;
87 extern int sysctl_nr_open_min, sysctl_nr_open_max;
88 #ifndef CONFIG_MMU
89 extern int sysctl_nr_trim_pages;
90 #endif
91 #ifdef CONFIG_RCU_TORTURE_TEST
92 extern int rcutorture_runnable;
93 #endif /* #ifdef CONFIG_RCU_TORTURE_TEST */
94
95 /* Constants used for minimum and maximum */
96 #ifdef CONFIG_DETECT_SOFTLOCKUP
97 static int sixty = 60;
98 static int neg_one = -1;
99 #endif
100
101 static int zero;
102 static int __maybe_unused one = 1;
103 static int __maybe_unused two = 2;
104 static unsigned long one_ul = 1;
105 static int one_hundred = 100;
106
107 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
108 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
109
110 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
111 static int maxolduid = 65535;
112 static int minolduid;
113 static int min_percpu_pagelist_fract = 8;
114
115 static int ngroups_max = NGROUPS_MAX;
116
117 #ifdef CONFIG_MODULES
118 extern char modprobe_path[];
119 extern int modules_disabled;
120 #endif
121 #ifdef CONFIG_CHR_DEV_SG
122 extern int sg_big_buff;
123 #endif
124
125 #ifdef CONFIG_SPARC
126 #include <asm/system.h>
127 #endif
128
129 #ifdef CONFIG_SPARC64
130 extern int sysctl_tsb_ratio;
131 #endif
132
133 #ifdef __hppa__
134 extern int pwrsw_enabled;
135 extern int unaligned_enabled;
136 #endif
137
138 #ifdef CONFIG_S390
139 #ifdef CONFIG_MATHEMU
140 extern int sysctl_ieee_emulation_warnings;
141 #endif
142 extern int sysctl_userprocess_debug;
143 extern int spin_retry;
144 #endif
145
146 #ifdef CONFIG_BSD_PROCESS_ACCT
147 extern int acct_parm[];
148 #endif
149
150 #ifdef CONFIG_IA64
151 extern int no_unaligned_warning;
152 extern int unaligned_dump_stack;
153 #endif
154
155 #ifdef CONFIG_RT_MUTEXES
156 extern int max_lock_depth;
157 #endif
158
159 #ifdef CONFIG_PROC_SYSCTL
160 static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
161 void __user *buffer, size_t *lenp, loff_t *ppos);
162 static int proc_taint(struct ctl_table *table, int write, struct file *filp,
163 void __user *buffer, size_t *lenp, loff_t *ppos);
164 #endif
165
166 static struct ctl_table root_table[];
167 static struct ctl_table_root sysctl_table_root;
168 static struct ctl_table_header root_table_header = {
169 .count = 1,
170 .ctl_table = root_table,
171 .ctl_entry = LIST_HEAD_INIT(sysctl_table_root.default_set.list),
172 .root = &sysctl_table_root,
173 .set = &sysctl_table_root.default_set,
174 };
175 static struct ctl_table_root sysctl_table_root = {
176 .root_list = LIST_HEAD_INIT(sysctl_table_root.root_list),
177 .default_set.list = LIST_HEAD_INIT(root_table_header.ctl_entry),
178 };
179
180 static struct ctl_table kern_table[];
181 static struct ctl_table vm_table[];
182 static struct ctl_table fs_table[];
183 static struct ctl_table debug_table[];
184 static struct ctl_table dev_table[];
185 extern struct ctl_table random_table[];
186 #ifdef CONFIG_INOTIFY_USER
187 extern struct ctl_table inotify_table[];
188 #endif
189 #ifdef CONFIG_EPOLL
190 extern struct ctl_table epoll_table[];
191 #endif
192
193 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
194 int sysctl_legacy_va_layout;
195 #endif
196
197 extern int prove_locking;
198 extern int lock_stat;
199
200 /* The default sysctl tables: */
201
202 static struct ctl_table root_table[] = {
203 {
204 .ctl_name = CTL_KERN,
205 .procname = "kernel",
206 .mode = 0555,
207 .child = kern_table,
208 },
209 {
210 .ctl_name = CTL_VM,
211 .procname = "vm",
212 .mode = 0555,
213 .child = vm_table,
214 },
215 {
216 .ctl_name = CTL_FS,
217 .procname = "fs",
218 .mode = 0555,
219 .child = fs_table,
220 },
221 {
222 .ctl_name = CTL_DEBUG,
223 .procname = "debug",
224 .mode = 0555,
225 .child = debug_table,
226 },
227 {
228 .ctl_name = CTL_DEV,
229 .procname = "dev",
230 .mode = 0555,
231 .child = dev_table,
232 },
233 /*
234 * NOTE: do not add new entries to this table unless you have read
235 * Documentation/sysctl/ctl_unnumbered.txt
236 */
237 { .ctl_name = 0 }
238 };
239
240 #ifdef CONFIG_SCHED_DEBUG
241 static int min_sched_granularity_ns = 100000; /* 100 usecs */
242 static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */
243 static int min_wakeup_granularity_ns; /* 0 usecs */
244 static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */
245 #endif
246
247 static struct ctl_table kern_table[] = {
248 #ifdef CONFIG_SCHED_DEBUG
249 {
250 .ctl_name = CTL_UNNUMBERED,
251 .procname = "sched_min_granularity_ns",
252 .data = &sysctl_sched_min_granularity,
253 .maxlen = sizeof(unsigned int),
254 .mode = 0644,
255 .proc_handler = &sched_nr_latency_handler,
256 .strategy = &sysctl_intvec,
257 .extra1 = &min_sched_granularity_ns,
258 .extra2 = &max_sched_granularity_ns,
259 },
260 {
261 .ctl_name = CTL_UNNUMBERED,
262 .procname = "sched_latency_ns",
263 .data = &sysctl_sched_latency,
264 .maxlen = sizeof(unsigned int),
265 .mode = 0644,
266 .proc_handler = &sched_nr_latency_handler,
267 .strategy = &sysctl_intvec,
268 .extra1 = &min_sched_granularity_ns,
269 .extra2 = &max_sched_granularity_ns,
270 },
271 {
272 .ctl_name = CTL_UNNUMBERED,
273 .procname = "sched_wakeup_granularity_ns",
274 .data = &sysctl_sched_wakeup_granularity,
275 .maxlen = sizeof(unsigned int),
276 .mode = 0644,
277 .proc_handler = &proc_dointvec_minmax,
278 .strategy = &sysctl_intvec,
279 .extra1 = &min_wakeup_granularity_ns,
280 .extra2 = &max_wakeup_granularity_ns,
281 },
282 {
283 .ctl_name = CTL_UNNUMBERED,
284 .procname = "sched_shares_ratelimit",
285 .data = &sysctl_sched_shares_ratelimit,
286 .maxlen = sizeof(unsigned int),
287 .mode = 0644,
288 .proc_handler = &proc_dointvec,
289 },
290 {
291 .ctl_name = CTL_UNNUMBERED,
292 .procname = "sched_shares_thresh",
293 .data = &sysctl_sched_shares_thresh,
294 .maxlen = sizeof(unsigned int),
295 .mode = 0644,
296 .proc_handler = &proc_dointvec_minmax,
297 .strategy = &sysctl_intvec,
298 .extra1 = &zero,
299 },
300 {
301 .ctl_name = CTL_UNNUMBERED,
302 .procname = "sched_child_runs_first",
303 .data = &sysctl_sched_child_runs_first,
304 .maxlen = sizeof(unsigned int),
305 .mode = 0644,
306 .proc_handler = &proc_dointvec,
307 },
308 {
309 .ctl_name = CTL_UNNUMBERED,
310 .procname = "sched_features",
311 .data = &sysctl_sched_features,
312 .maxlen = sizeof(unsigned int),
313 .mode = 0644,
314 .proc_handler = &proc_dointvec,
315 },
316 {
317 .ctl_name = CTL_UNNUMBERED,
318 .procname = "sched_migration_cost",
319 .data = &sysctl_sched_migration_cost,
320 .maxlen = sizeof(unsigned int),
321 .mode = 0644,
322 .proc_handler = &proc_dointvec,
323 },
324 {
325 .ctl_name = CTL_UNNUMBERED,
326 .procname = "sched_nr_migrate",
327 .data = &sysctl_sched_nr_migrate,
328 .maxlen = sizeof(unsigned int),
329 .mode = 0644,
330 .proc_handler = &proc_dointvec,
331 },
332 {
333 .ctl_name = CTL_UNNUMBERED,
334 .procname = "timer_migration",
335 .data = &sysctl_timer_migration,
336 .maxlen = sizeof(unsigned int),
337 .mode = 0644,
338 .proc_handler = &proc_dointvec,
339 },
340 #endif
341 {
342 .ctl_name = CTL_UNNUMBERED,
343 .procname = "sched_rt_period_us",
344 .data = &sysctl_sched_rt_period,
345 .maxlen = sizeof(unsigned int),
346 .mode = 0644,
347 .proc_handler = &sched_rt_handler,
348 },
349 {
350 .ctl_name = CTL_UNNUMBERED,
351 .procname = "sched_rt_runtime_us",
352 .data = &sysctl_sched_rt_runtime,
353 .maxlen = sizeof(int),
354 .mode = 0644,
355 .proc_handler = &sched_rt_handler,
356 },
357 {
358 .ctl_name = CTL_UNNUMBERED,
359 .procname = "sched_compat_yield",
360 .data = &sysctl_sched_compat_yield,
361 .maxlen = sizeof(unsigned int),
362 .mode = 0644,
363 .proc_handler = &proc_dointvec,
364 },
365 #ifdef CONFIG_PROVE_LOCKING
366 {
367 .ctl_name = CTL_UNNUMBERED,
368 .procname = "prove_locking",
369 .data = &prove_locking,
370 .maxlen = sizeof(int),
371 .mode = 0644,
372 .proc_handler = &proc_dointvec,
373 },
374 #endif
375 #ifdef CONFIG_LOCK_STAT
376 {
377 .ctl_name = CTL_UNNUMBERED,
378 .procname = "lock_stat",
379 .data = &lock_stat,
380 .maxlen = sizeof(int),
381 .mode = 0644,
382 .proc_handler = &proc_dointvec,
383 },
384 #endif
385 {
386 .ctl_name = KERN_PANIC,
387 .procname = "panic",
388 .data = &panic_timeout,
389 .maxlen = sizeof(int),
390 .mode = 0644,
391 .proc_handler = &proc_dointvec,
392 },
393 {
394 .ctl_name = KERN_CORE_USES_PID,
395 .procname = "core_uses_pid",
396 .data = &core_uses_pid,
397 .maxlen = sizeof(int),
398 .mode = 0644,
399 .proc_handler = &proc_dointvec,
400 },
401 {
402 .ctl_name = KERN_CORE_PATTERN,
403 .procname = "core_pattern",
404 .data = core_pattern,
405 .maxlen = CORENAME_MAX_SIZE,
406 .mode = 0644,
407 .proc_handler = &proc_dostring,
408 .strategy = &sysctl_string,
409 },
410 #ifdef CONFIG_PROC_SYSCTL
411 {
412 .procname = "tainted",
413 .maxlen = sizeof(long),
414 .mode = 0644,
415 .proc_handler = &proc_taint,
416 },
417 #endif
418 #ifdef CONFIG_LATENCYTOP
419 {
420 .procname = "latencytop",
421 .data = &latencytop_enabled,
422 .maxlen = sizeof(int),
423 .mode = 0644,
424 .proc_handler = &proc_dointvec,
425 },
426 #endif
427 #ifdef CONFIG_BLK_DEV_INITRD
428 {
429 .ctl_name = KERN_REALROOTDEV,
430 .procname = "real-root-dev",
431 .data = &real_root_dev,
432 .maxlen = sizeof(int),
433 .mode = 0644,
434 .proc_handler = &proc_dointvec,
435 },
436 #endif
437 {
438 .ctl_name = CTL_UNNUMBERED,
439 .procname = "print-fatal-signals",
440 .data = &print_fatal_signals,
441 .maxlen = sizeof(int),
442 .mode = 0644,
443 .proc_handler = &proc_dointvec,
444 },
445 #ifdef CONFIG_SPARC
446 {
447 .ctl_name = KERN_SPARC_REBOOT,
448 .procname = "reboot-cmd",
449 .data = reboot_command,
450 .maxlen = 256,
451 .mode = 0644,
452 .proc_handler = &proc_dostring,
453 .strategy = &sysctl_string,
454 },
455 {
456 .ctl_name = KERN_SPARC_STOP_A,
457 .procname = "stop-a",
458 .data = &stop_a_enabled,
459 .maxlen = sizeof (int),
460 .mode = 0644,
461 .proc_handler = &proc_dointvec,
462 },
463 {
464 .ctl_name = KERN_SPARC_SCONS_PWROFF,
465 .procname = "scons-poweroff",
466 .data = &scons_pwroff,
467 .maxlen = sizeof (int),
468 .mode = 0644,
469 .proc_handler = &proc_dointvec,
470 },
471 #endif
472 #ifdef CONFIG_SPARC64
473 {
474 .ctl_name = CTL_UNNUMBERED,
475 .procname = "tsb-ratio",
476 .data = &sysctl_tsb_ratio,
477 .maxlen = sizeof (int),
478 .mode = 0644,
479 .proc_handler = &proc_dointvec,
480 },
481 #endif
482 #ifdef __hppa__
483 {
484 .ctl_name = KERN_HPPA_PWRSW,
485 .procname = "soft-power",
486 .data = &pwrsw_enabled,
487 .maxlen = sizeof (int),
488 .mode = 0644,
489 .proc_handler = &proc_dointvec,
490 },
491 {
492 .ctl_name = KERN_HPPA_UNALIGNED,
493 .procname = "unaligned-trap",
494 .data = &unaligned_enabled,
495 .maxlen = sizeof (int),
496 .mode = 0644,
497 .proc_handler = &proc_dointvec,
498 },
499 #endif
500 {
501 .ctl_name = KERN_CTLALTDEL,
502 .procname = "ctrl-alt-del",
503 .data = &C_A_D,
504 .maxlen = sizeof(int),
505 .mode = 0644,
506 .proc_handler = &proc_dointvec,
507 },
508 #ifdef CONFIG_FUNCTION_TRACER
509 {
510 .ctl_name = CTL_UNNUMBERED,
511 .procname = "ftrace_enabled",
512 .data = &ftrace_enabled,
513 .maxlen = sizeof(int),
514 .mode = 0644,
515 .proc_handler = &ftrace_enable_sysctl,
516 },
517 #endif
518 #ifdef CONFIG_STACK_TRACER
519 {
520 .ctl_name = CTL_UNNUMBERED,
521 .procname = "stack_tracer_enabled",
522 .data = &stack_tracer_enabled,
523 .maxlen = sizeof(int),
524 .mode = 0644,
525 .proc_handler = &stack_trace_sysctl,
526 },
527 #endif
528 #ifdef CONFIG_TRACING
529 {
530 .ctl_name = CTL_UNNUMBERED,
531 .procname = "ftrace_dump_on_oops",
532 .data = &ftrace_dump_on_oops,
533 .maxlen = sizeof(int),
534 .mode = 0644,
535 .proc_handler = &proc_dointvec,
536 },
537 #endif
538 #ifdef CONFIG_MODULES
539 {
540 .ctl_name = KERN_MODPROBE,
541 .procname = "modprobe",
542 .data = &modprobe_path,
543 .maxlen = KMOD_PATH_LEN,
544 .mode = 0644,
545 .proc_handler = &proc_dostring,
546 .strategy = &sysctl_string,
547 },
548 {
549 .ctl_name = CTL_UNNUMBERED,
550 .procname = "modules_disabled",
551 .data = &modules_disabled,
552 .maxlen = sizeof(int),
553 .mode = 0644,
554 /* only handle a transition from default "0" to "1" */
555 .proc_handler = &proc_dointvec_minmax,
556 .extra1 = &one,
557 .extra2 = &one,
558 },
559 #endif
560 #if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET)
561 {
562 .ctl_name = KERN_HOTPLUG,
563 .procname = "hotplug",
564 .data = &uevent_helper,
565 .maxlen = UEVENT_HELPER_PATH_LEN,
566 .mode = 0644,
567 .proc_handler = &proc_dostring,
568 .strategy = &sysctl_string,
569 },
570 #endif
571 #ifdef CONFIG_CHR_DEV_SG
572 {
573 .ctl_name = KERN_SG_BIG_BUFF,
574 .procname = "sg-big-buff",
575 .data = &sg_big_buff,
576 .maxlen = sizeof (int),
577 .mode = 0444,
578 .proc_handler = &proc_dointvec,
579 },
580 #endif
581 #ifdef CONFIG_BSD_PROCESS_ACCT
582 {
583 .ctl_name = KERN_ACCT,
584 .procname = "acct",
585 .data = &acct_parm,
586 .maxlen = 3*sizeof(int),
587 .mode = 0644,
588 .proc_handler = &proc_dointvec,
589 },
590 #endif
591 #ifdef CONFIG_MAGIC_SYSRQ
592 {
593 .ctl_name = KERN_SYSRQ,
594 .procname = "sysrq",
595 .data = &__sysrq_enabled,
596 .maxlen = sizeof (int),
597 .mode = 0644,
598 .proc_handler = &proc_dointvec,
599 },
600 #endif
601 #ifdef CONFIG_PROC_SYSCTL
602 {
603 .procname = "cad_pid",
604 .data = NULL,
605 .maxlen = sizeof (int),
606 .mode = 0600,
607 .proc_handler = &proc_do_cad_pid,
608 },
609 #endif
610 {
611 .ctl_name = KERN_MAX_THREADS,
612 .procname = "threads-max",
613 .data = &max_threads,
614 .maxlen = sizeof(int),
615 .mode = 0644,
616 .proc_handler = &proc_dointvec,
617 },
618 {
619 .ctl_name = KERN_RANDOM,
620 .procname = "random",
621 .mode = 0555,
622 .child = random_table,
623 },
624 {
625 .ctl_name = KERN_OVERFLOWUID,
626 .procname = "overflowuid",
627 .data = &overflowuid,
628 .maxlen = sizeof(int),
629 .mode = 0644,
630 .proc_handler = &proc_dointvec_minmax,
631 .strategy = &sysctl_intvec,
632 .extra1 = &minolduid,
633 .extra2 = &maxolduid,
634 },
635 {
636 .ctl_name = KERN_OVERFLOWGID,
637 .procname = "overflowgid",
638 .data = &overflowgid,
639 .maxlen = sizeof(int),
640 .mode = 0644,
641 .proc_handler = &proc_dointvec_minmax,
642 .strategy = &sysctl_intvec,
643 .extra1 = &minolduid,
644 .extra2 = &maxolduid,
645 },
646 #ifdef CONFIG_S390
647 #ifdef CONFIG_MATHEMU
648 {
649 .ctl_name = KERN_IEEE_EMULATION_WARNINGS,
650 .procname = "ieee_emulation_warnings",
651 .data = &sysctl_ieee_emulation_warnings,
652 .maxlen = sizeof(int),
653 .mode = 0644,
654 .proc_handler = &proc_dointvec,
655 },
656 #endif
657 {
658 .ctl_name = KERN_S390_USER_DEBUG_LOGGING,
659 .procname = "userprocess_debug",
660 .data = &sysctl_userprocess_debug,
661 .maxlen = sizeof(int),
662 .mode = 0644,
663 .proc_handler = &proc_dointvec,
664 },
665 #endif
666 {
667 .ctl_name = KERN_PIDMAX,
668 .procname = "pid_max",
669 .data = &pid_max,
670 .maxlen = sizeof (int),
671 .mode = 0644,
672 .proc_handler = &proc_dointvec_minmax,
673 .strategy = sysctl_intvec,
674 .extra1 = &pid_max_min,
675 .extra2 = &pid_max_max,
676 },
677 {
678 .ctl_name = KERN_PANIC_ON_OOPS,
679 .procname = "panic_on_oops",
680 .data = &panic_on_oops,
681 .maxlen = sizeof(int),
682 .mode = 0644,
683 .proc_handler = &proc_dointvec,
684 },
685 #if defined CONFIG_PRINTK
686 {
687 .ctl_name = KERN_PRINTK,
688 .procname = "printk",
689 .data = &console_loglevel,
690 .maxlen = 4*sizeof(int),
691 .mode = 0644,
692 .proc_handler = &proc_dointvec,
693 },
694 {
695 .ctl_name = KERN_PRINTK_RATELIMIT,
696 .procname = "printk_ratelimit",
697 .data = &printk_ratelimit_state.interval,
698 .maxlen = sizeof(int),
699 .mode = 0644,
700 .proc_handler = &proc_dointvec_jiffies,
701 .strategy = &sysctl_jiffies,
702 },
703 {
704 .ctl_name = KERN_PRINTK_RATELIMIT_BURST,
705 .procname = "printk_ratelimit_burst",
706 .data = &printk_ratelimit_state.burst,
707 .maxlen = sizeof(int),
708 .mode = 0644,
709 .proc_handler = &proc_dointvec,
710 },
711 #endif
712 {
713 .ctl_name = KERN_NGROUPS_MAX,
714 .procname = "ngroups_max",
715 .data = &ngroups_max,
716 .maxlen = sizeof (int),
717 .mode = 0444,
718 .proc_handler = &proc_dointvec,
719 },
720 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
721 {
722 .ctl_name = KERN_UNKNOWN_NMI_PANIC,
723 .procname = "unknown_nmi_panic",
724 .data = &unknown_nmi_panic,
725 .maxlen = sizeof (int),
726 .mode = 0644,
727 .proc_handler = &proc_dointvec,
728 },
729 {
730 .procname = "nmi_watchdog",
731 .data = &nmi_watchdog_enabled,
732 .maxlen = sizeof (int),
733 .mode = 0644,
734 .proc_handler = &proc_nmi_enabled,
735 },
736 #endif
737 #if defined(CONFIG_X86)
738 {
739 .ctl_name = KERN_PANIC_ON_NMI,
740 .procname = "panic_on_unrecovered_nmi",
741 .data = &panic_on_unrecovered_nmi,
742 .maxlen = sizeof(int),
743 .mode = 0644,
744 .proc_handler = &proc_dointvec,
745 },
746 {
747 .ctl_name = CTL_UNNUMBERED,
748 .procname = "panic_on_io_nmi",
749 .data = &panic_on_io_nmi,
750 .maxlen = sizeof(int),
751 .mode = 0644,
752 .proc_handler = &proc_dointvec,
753 },
754 {
755 .ctl_name = KERN_BOOTLOADER_TYPE,
756 .procname = "bootloader_type",
757 .data = &bootloader_type,
758 .maxlen = sizeof (int),
759 .mode = 0444,
760 .proc_handler = &proc_dointvec,
761 },
762 {
763 .ctl_name = CTL_UNNUMBERED,
764 .procname = "bootloader_version",
765 .data = &bootloader_version,
766 .maxlen = sizeof (int),
767 .mode = 0444,
768 .proc_handler = &proc_dointvec,
769 },
770 {
771 .ctl_name = CTL_UNNUMBERED,
772 .procname = "kstack_depth_to_print",
773 .data = &kstack_depth_to_print,
774 .maxlen = sizeof(int),
775 .mode = 0644,
776 .proc_handler = &proc_dointvec,
777 },
778 {
779 .ctl_name = CTL_UNNUMBERED,
780 .procname = "io_delay_type",
781 .data = &io_delay_type,
782 .maxlen = sizeof(int),
783 .mode = 0644,
784 .proc_handler = &proc_dointvec,
785 },
786 #endif
787 #if defined(CONFIG_MMU)
788 {
789 .ctl_name = KERN_RANDOMIZE,
790 .procname = "randomize_va_space",
791 .data = &randomize_va_space,
792 .maxlen = sizeof(int),
793 .mode = 0644,
794 .proc_handler = &proc_dointvec,
795 },
796 #endif
797 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
798 {
799 .ctl_name = KERN_SPIN_RETRY,
800 .procname = "spin_retry",
801 .data = &spin_retry,
802 .maxlen = sizeof (int),
803 .mode = 0644,
804 .proc_handler = &proc_dointvec,
805 },
806 #endif
807 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
808 {
809 .procname = "acpi_video_flags",
810 .data = &acpi_realmode_flags,
811 .maxlen = sizeof (unsigned long),
812 .mode = 0644,
813 .proc_handler = &proc_doulongvec_minmax,
814 },
815 #endif
816 #ifdef CONFIG_IA64
817 {
818 .ctl_name = KERN_IA64_UNALIGNED,
819 .procname = "ignore-unaligned-usertrap",
820 .data = &no_unaligned_warning,
821 .maxlen = sizeof (int),
822 .mode = 0644,
823 .proc_handler = &proc_dointvec,
824 },
825 {
826 .ctl_name = CTL_UNNUMBERED,
827 .procname = "unaligned-dump-stack",
828 .data = &unaligned_dump_stack,
829 .maxlen = sizeof (int),
830 .mode = 0644,
831 .proc_handler = &proc_dointvec,
832 },
833 #endif
834 #ifdef CONFIG_DETECT_SOFTLOCKUP
835 {
836 .ctl_name = CTL_UNNUMBERED,
837 .procname = "softlockup_panic",
838 .data = &softlockup_panic,
839 .maxlen = sizeof(int),
840 .mode = 0644,
841 .proc_handler = &proc_dointvec_minmax,
842 .strategy = &sysctl_intvec,
843 .extra1 = &zero,
844 .extra2 = &one,
845 },
846 {
847 .ctl_name = CTL_UNNUMBERED,
848 .procname = "softlockup_thresh",
849 .data = &softlockup_thresh,
850 .maxlen = sizeof(int),
851 .mode = 0644,
852 .proc_handler = &proc_dosoftlockup_thresh,
853 .strategy = &sysctl_intvec,
854 .extra1 = &neg_one,
855 .extra2 = &sixty,
856 },
857 #endif
858 #ifdef CONFIG_DETECT_HUNG_TASK
859 {
860 .ctl_name = CTL_UNNUMBERED,
861 .procname = "hung_task_panic",
862 .data = &sysctl_hung_task_panic,
863 .maxlen = sizeof(int),
864 .mode = 0644,
865 .proc_handler = &proc_dointvec_minmax,
866 .strategy = &sysctl_intvec,
867 .extra1 = &zero,
868 .extra2 = &one,
869 },
870 {
871 .ctl_name = CTL_UNNUMBERED,
872 .procname = "hung_task_check_count",
873 .data = &sysctl_hung_task_check_count,
874 .maxlen = sizeof(unsigned long),
875 .mode = 0644,
876 .proc_handler = &proc_doulongvec_minmax,
877 .strategy = &sysctl_intvec,
878 },
879 {
880 .ctl_name = CTL_UNNUMBERED,
881 .procname = "hung_task_timeout_secs",
882 .data = &sysctl_hung_task_timeout_secs,
883 .maxlen = sizeof(unsigned long),
884 .mode = 0644,
885 .proc_handler = &proc_dohung_task_timeout_secs,
886 .strategy = &sysctl_intvec,
887 },
888 {
889 .ctl_name = CTL_UNNUMBERED,
890 .procname = "hung_task_warnings",
891 .data = &sysctl_hung_task_warnings,
892 .maxlen = sizeof(unsigned long),
893 .mode = 0644,
894 .proc_handler = &proc_doulongvec_minmax,
895 .strategy = &sysctl_intvec,
896 },
897 #endif
898 #ifdef CONFIG_COMPAT
899 {
900 .ctl_name = KERN_COMPAT_LOG,
901 .procname = "compat-log",
902 .data = &compat_log,
903 .maxlen = sizeof (int),
904 .mode = 0644,
905 .proc_handler = &proc_dointvec,
906 },
907 #endif
908 #ifdef CONFIG_RT_MUTEXES
909 {
910 .ctl_name = KERN_MAX_LOCK_DEPTH,
911 .procname = "max_lock_depth",
912 .data = &max_lock_depth,
913 .maxlen = sizeof(int),
914 .mode = 0644,
915 .proc_handler = &proc_dointvec,
916 },
917 #endif
918 {
919 .ctl_name = CTL_UNNUMBERED,
920 .procname = "poweroff_cmd",
921 .data = &poweroff_cmd,
922 .maxlen = POWEROFF_CMD_PATH_LEN,
923 .mode = 0644,
924 .proc_handler = &proc_dostring,
925 .strategy = &sysctl_string,
926 },
927 #ifdef CONFIG_KEYS
928 {
929 .ctl_name = CTL_UNNUMBERED,
930 .procname = "keys",
931 .mode = 0555,
932 .child = key_sysctls,
933 },
934 #endif
935 #ifdef CONFIG_RCU_TORTURE_TEST
936 {
937 .ctl_name = CTL_UNNUMBERED,
938 .procname = "rcutorture_runnable",
939 .data = &rcutorture_runnable,
940 .maxlen = sizeof(int),
941 .mode = 0644,
942 .proc_handler = &proc_dointvec,
943 },
944 #endif
945 #ifdef CONFIG_SLOW_WORK
946 {
947 .ctl_name = CTL_UNNUMBERED,
948 .procname = "slow-work",
949 .mode = 0555,
950 .child = slow_work_sysctls,
951 },
952 #endif
953 #ifdef CONFIG_PERF_COUNTERS
954 {
955 .ctl_name = CTL_UNNUMBERED,
956 .procname = "perf_counter_paranoid",
957 .data = &sysctl_perf_counter_paranoid,
958 .maxlen = sizeof(sysctl_perf_counter_paranoid),
959 .mode = 0644,
960 .proc_handler = &proc_dointvec,
961 },
962 {
963 .ctl_name = CTL_UNNUMBERED,
964 .procname = "perf_counter_mlock_kb",
965 .data = &sysctl_perf_counter_mlock,
966 .maxlen = sizeof(sysctl_perf_counter_mlock),
967 .mode = 0644,
968 .proc_handler = &proc_dointvec,
969 },
970 {
971 .ctl_name = CTL_UNNUMBERED,
972 .procname = "perf_counter_max_sample_rate",
973 .data = &sysctl_perf_counter_sample_rate,
974 .maxlen = sizeof(sysctl_perf_counter_sample_rate),
975 .mode = 0644,
976 .proc_handler = &proc_dointvec,
977 },
978 #endif
979 #ifdef CONFIG_KMEMCHECK
980 {
981 .ctl_name = CTL_UNNUMBERED,
982 .procname = "kmemcheck",
983 .data = &kmemcheck_enabled,
984 .maxlen = sizeof(int),
985 .mode = 0644,
986 .proc_handler = &proc_dointvec,
987 },
988 #endif
989
990 /*
991 * NOTE: do not add new entries to this table unless you have read
992 * Documentation/sysctl/ctl_unnumbered.txt
993 */
994 { .ctl_name = 0 }
995 };
996
997 static struct ctl_table vm_table[] = {
998 {
999 .ctl_name = VM_OVERCOMMIT_MEMORY,
1000 .procname = "overcommit_memory",
1001 .data = &sysctl_overcommit_memory,
1002 .maxlen = sizeof(sysctl_overcommit_memory),
1003 .mode = 0644,
1004 .proc_handler = &proc_dointvec,
1005 },
1006 {
1007 .ctl_name = VM_PANIC_ON_OOM,
1008 .procname = "panic_on_oom",
1009 .data = &sysctl_panic_on_oom,
1010 .maxlen = sizeof(sysctl_panic_on_oom),
1011 .mode = 0644,
1012 .proc_handler = &proc_dointvec,
1013 },
1014 {
1015 .ctl_name = CTL_UNNUMBERED,
1016 .procname = "oom_kill_allocating_task",
1017 .data = &sysctl_oom_kill_allocating_task,
1018 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
1019 .mode = 0644,
1020 .proc_handler = &proc_dointvec,
1021 },
1022 {
1023 .ctl_name = CTL_UNNUMBERED,
1024 .procname = "oom_dump_tasks",
1025 .data = &sysctl_oom_dump_tasks,
1026 .maxlen = sizeof(sysctl_oom_dump_tasks),
1027 .mode = 0644,
1028 .proc_handler = &proc_dointvec,
1029 },
1030 {
1031 .ctl_name = VM_OVERCOMMIT_RATIO,
1032 .procname = "overcommit_ratio",
1033 .data = &sysctl_overcommit_ratio,
1034 .maxlen = sizeof(sysctl_overcommit_ratio),
1035 .mode = 0644,
1036 .proc_handler = &proc_dointvec,
1037 },
1038 {
1039 .ctl_name = VM_PAGE_CLUSTER,
1040 .procname = "page-cluster",
1041 .data = &page_cluster,
1042 .maxlen = sizeof(int),
1043 .mode = 0644,
1044 .proc_handler = &proc_dointvec,
1045 },
1046 {
1047 .ctl_name = VM_DIRTY_BACKGROUND,
1048 .procname = "dirty_background_ratio",
1049 .data = &dirty_background_ratio,
1050 .maxlen = sizeof(dirty_background_ratio),
1051 .mode = 0644,
1052 .proc_handler = &dirty_background_ratio_handler,
1053 .strategy = &sysctl_intvec,
1054 .extra1 = &zero,
1055 .extra2 = &one_hundred,
1056 },
1057 {
1058 .ctl_name = CTL_UNNUMBERED,
1059 .procname = "dirty_background_bytes",
1060 .data = &dirty_background_bytes,
1061 .maxlen = sizeof(dirty_background_bytes),
1062 .mode = 0644,
1063 .proc_handler = &dirty_background_bytes_handler,
1064 .strategy = &sysctl_intvec,
1065 .extra1 = &one_ul,
1066 },
1067 {
1068 .ctl_name = VM_DIRTY_RATIO,
1069 .procname = "dirty_ratio",
1070 .data = &vm_dirty_ratio,
1071 .maxlen = sizeof(vm_dirty_ratio),
1072 .mode = 0644,
1073 .proc_handler = &dirty_ratio_handler,
1074 .strategy = &sysctl_intvec,
1075 .extra1 = &zero,
1076 .extra2 = &one_hundred,
1077 },
1078 {
1079 .ctl_name = CTL_UNNUMBERED,
1080 .procname = "dirty_bytes",
1081 .data = &vm_dirty_bytes,
1082 .maxlen = sizeof(vm_dirty_bytes),
1083 .mode = 0644,
1084 .proc_handler = &dirty_bytes_handler,
1085 .strategy = &sysctl_intvec,
1086 .extra1 = &dirty_bytes_min,
1087 },
1088 {
1089 .procname = "dirty_writeback_centisecs",
1090 .data = &dirty_writeback_interval,
1091 .maxlen = sizeof(dirty_writeback_interval),
1092 .mode = 0644,
1093 .proc_handler = &dirty_writeback_centisecs_handler,
1094 },
1095 {
1096 .procname = "dirty_expire_centisecs",
1097 .data = &dirty_expire_interval,
1098 .maxlen = sizeof(dirty_expire_interval),
1099 .mode = 0644,
1100 .proc_handler = &proc_dointvec,
1101 },
1102 {
1103 .ctl_name = VM_NR_PDFLUSH_THREADS,
1104 .procname = "nr_pdflush_threads",
1105 .data = &nr_pdflush_threads,
1106 .maxlen = sizeof nr_pdflush_threads,
1107 .mode = 0444 /* read-only*/,
1108 .proc_handler = &proc_dointvec,
1109 },
1110 {
1111 .ctl_name = VM_SWAPPINESS,
1112 .procname = "swappiness",
1113 .data = &vm_swappiness,
1114 .maxlen = sizeof(vm_swappiness),
1115 .mode = 0644,
1116 .proc_handler = &proc_dointvec_minmax,
1117 .strategy = &sysctl_intvec,
1118 .extra1 = &zero,
1119 .extra2 = &one_hundred,
1120 },
1121 #ifdef CONFIG_HUGETLB_PAGE
1122 {
1123 .procname = "nr_hugepages",
1124 .data = NULL,
1125 .maxlen = sizeof(unsigned long),
1126 .mode = 0644,
1127 .proc_handler = &hugetlb_sysctl_handler,
1128 .extra1 = (void *)&hugetlb_zero,
1129 .extra2 = (void *)&hugetlb_infinity,
1130 },
1131 {
1132 .ctl_name = VM_HUGETLB_GROUP,
1133 .procname = "hugetlb_shm_group",
1134 .data = &sysctl_hugetlb_shm_group,
1135 .maxlen = sizeof(gid_t),
1136 .mode = 0644,
1137 .proc_handler = &proc_dointvec,
1138 },
1139 {
1140 .ctl_name = CTL_UNNUMBERED,
1141 .procname = "hugepages_treat_as_movable",
1142 .data = &hugepages_treat_as_movable,
1143 .maxlen = sizeof(int),
1144 .mode = 0644,
1145 .proc_handler = &hugetlb_treat_movable_handler,
1146 },
1147 {
1148 .ctl_name = CTL_UNNUMBERED,
1149 .procname = "nr_overcommit_hugepages",
1150 .data = NULL,
1151 .maxlen = sizeof(unsigned long),
1152 .mode = 0644,
1153 .proc_handler = &hugetlb_overcommit_handler,
1154 .extra1 = (void *)&hugetlb_zero,
1155 .extra2 = (void *)&hugetlb_infinity,
1156 },
1157 #endif
1158 {
1159 .ctl_name = VM_LOWMEM_RESERVE_RATIO,
1160 .procname = "lowmem_reserve_ratio",
1161 .data = &sysctl_lowmem_reserve_ratio,
1162 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1163 .mode = 0644,
1164 .proc_handler = &lowmem_reserve_ratio_sysctl_handler,
1165 .strategy = &sysctl_intvec,
1166 },
1167 {
1168 .ctl_name = VM_DROP_PAGECACHE,
1169 .procname = "drop_caches",
1170 .data = &sysctl_drop_caches,
1171 .maxlen = sizeof(int),
1172 .mode = 0644,
1173 .proc_handler = drop_caches_sysctl_handler,
1174 .strategy = &sysctl_intvec,
1175 },
1176 {
1177 .ctl_name = VM_MIN_FREE_KBYTES,
1178 .procname = "min_free_kbytes",
1179 .data = &min_free_kbytes,
1180 .maxlen = sizeof(min_free_kbytes),
1181 .mode = 0644,
1182 .proc_handler = &min_free_kbytes_sysctl_handler,
1183 .strategy = &sysctl_intvec,
1184 .extra1 = &zero,
1185 },
1186 {
1187 .ctl_name = VM_PERCPU_PAGELIST_FRACTION,
1188 .procname = "percpu_pagelist_fraction",
1189 .data = &percpu_pagelist_fraction,
1190 .maxlen = sizeof(percpu_pagelist_fraction),
1191 .mode = 0644,
1192 .proc_handler = &percpu_pagelist_fraction_sysctl_handler,
1193 .strategy = &sysctl_intvec,
1194 .extra1 = &min_percpu_pagelist_fract,
1195 },
1196 #ifdef CONFIG_MMU
1197 {
1198 .ctl_name = VM_MAX_MAP_COUNT,
1199 .procname = "max_map_count",
1200 .data = &sysctl_max_map_count,
1201 .maxlen = sizeof(sysctl_max_map_count),
1202 .mode = 0644,
1203 .proc_handler = &proc_dointvec
1204 },
1205 #else
1206 {
1207 .ctl_name = CTL_UNNUMBERED,
1208 .procname = "nr_trim_pages",
1209 .data = &sysctl_nr_trim_pages,
1210 .maxlen = sizeof(sysctl_nr_trim_pages),
1211 .mode = 0644,
1212 .proc_handler = &proc_dointvec_minmax,
1213 .strategy = &sysctl_intvec,
1214 .extra1 = &zero,
1215 },
1216 #endif
1217 {
1218 .ctl_name = VM_LAPTOP_MODE,
1219 .procname = "laptop_mode",
1220 .data = &laptop_mode,
1221 .maxlen = sizeof(laptop_mode),
1222 .mode = 0644,
1223 .proc_handler = &proc_dointvec_jiffies,
1224 .strategy = &sysctl_jiffies,
1225 },
1226 {
1227 .ctl_name = VM_BLOCK_DUMP,
1228 .procname = "block_dump",
1229 .data = &block_dump,
1230 .maxlen = sizeof(block_dump),
1231 .mode = 0644,
1232 .proc_handler = &proc_dointvec,
1233 .strategy = &sysctl_intvec,
1234 .extra1 = &zero,
1235 },
1236 {
1237 .ctl_name = VM_VFS_CACHE_PRESSURE,
1238 .procname = "vfs_cache_pressure",
1239 .data = &sysctl_vfs_cache_pressure,
1240 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1241 .mode = 0644,
1242 .proc_handler = &proc_dointvec,
1243 .strategy = &sysctl_intvec,
1244 .extra1 = &zero,
1245 },
1246 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1247 {
1248 .ctl_name = VM_LEGACY_VA_LAYOUT,
1249 .procname = "legacy_va_layout",
1250 .data = &sysctl_legacy_va_layout,
1251 .maxlen = sizeof(sysctl_legacy_va_layout),
1252 .mode = 0644,
1253 .proc_handler = &proc_dointvec,
1254 .strategy = &sysctl_intvec,
1255 .extra1 = &zero,
1256 },
1257 #endif
1258 #ifdef CONFIG_NUMA
1259 {
1260 .ctl_name = VM_ZONE_RECLAIM_MODE,
1261 .procname = "zone_reclaim_mode",
1262 .data = &zone_reclaim_mode,
1263 .maxlen = sizeof(zone_reclaim_mode),
1264 .mode = 0644,
1265 .proc_handler = &proc_dointvec,
1266 .strategy = &sysctl_intvec,
1267 .extra1 = &zero,
1268 },
1269 {
1270 .ctl_name = VM_MIN_UNMAPPED,
1271 .procname = "min_unmapped_ratio",
1272 .data = &sysctl_min_unmapped_ratio,
1273 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1274 .mode = 0644,
1275 .proc_handler = &sysctl_min_unmapped_ratio_sysctl_handler,
1276 .strategy = &sysctl_intvec,
1277 .extra1 = &zero,
1278 .extra2 = &one_hundred,
1279 },
1280 {
1281 .ctl_name = VM_MIN_SLAB,
1282 .procname = "min_slab_ratio",
1283 .data = &sysctl_min_slab_ratio,
1284 .maxlen = sizeof(sysctl_min_slab_ratio),
1285 .mode = 0644,
1286 .proc_handler = &sysctl_min_slab_ratio_sysctl_handler,
1287 .strategy = &sysctl_intvec,
1288 .extra1 = &zero,
1289 .extra2 = &one_hundred,
1290 },
1291 #endif
1292 #ifdef CONFIG_SMP
1293 {
1294 .ctl_name = CTL_UNNUMBERED,
1295 .procname = "stat_interval",
1296 .data = &sysctl_stat_interval,
1297 .maxlen = sizeof(sysctl_stat_interval),
1298 .mode = 0644,
1299 .proc_handler = &proc_dointvec_jiffies,
1300 .strategy = &sysctl_jiffies,
1301 },
1302 #endif
1303 {
1304 .ctl_name = CTL_UNNUMBERED,
1305 .procname = "mmap_min_addr",
1306 .data = &mmap_min_addr,
1307 .maxlen = sizeof(unsigned long),
1308 .mode = 0644,
1309 .proc_handler = &proc_doulongvec_minmax,
1310 },
1311 #ifdef CONFIG_NUMA
1312 {
1313 .ctl_name = CTL_UNNUMBERED,
1314 .procname = "numa_zonelist_order",
1315 .data = &numa_zonelist_order,
1316 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1317 .mode = 0644,
1318 .proc_handler = &numa_zonelist_order_handler,
1319 .strategy = &sysctl_string,
1320 },
1321 #endif
1322 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1323 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1324 {
1325 .ctl_name = VM_VDSO_ENABLED,
1326 .procname = "vdso_enabled",
1327 .data = &vdso_enabled,
1328 .maxlen = sizeof(vdso_enabled),
1329 .mode = 0644,
1330 .proc_handler = &proc_dointvec,
1331 .strategy = &sysctl_intvec,
1332 .extra1 = &zero,
1333 },
1334 #endif
1335 #ifdef CONFIG_HIGHMEM
1336 {
1337 .ctl_name = CTL_UNNUMBERED,
1338 .procname = "highmem_is_dirtyable",
1339 .data = &vm_highmem_is_dirtyable,
1340 .maxlen = sizeof(vm_highmem_is_dirtyable),
1341 .mode = 0644,
1342 .proc_handler = &proc_dointvec_minmax,
1343 .strategy = &sysctl_intvec,
1344 .extra1 = &zero,
1345 .extra2 = &one,
1346 },
1347 #endif
1348 {
1349 .ctl_name = CTL_UNNUMBERED,
1350 .procname = "scan_unevictable_pages",
1351 .data = &scan_unevictable_pages,
1352 .maxlen = sizeof(scan_unevictable_pages),
1353 .mode = 0644,
1354 .proc_handler = &scan_unevictable_handler,
1355 },
1356 /*
1357 * NOTE: do not add new entries to this table unless you have read
1358 * Documentation/sysctl/ctl_unnumbered.txt
1359 */
1360 { .ctl_name = 0 }
1361 };
1362
1363 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1364 static struct ctl_table binfmt_misc_table[] = {
1365 { .ctl_name = 0 }
1366 };
1367 #endif
1368
1369 static struct ctl_table fs_table[] = {
1370 {
1371 .ctl_name = FS_NRINODE,
1372 .procname = "inode-nr",
1373 .data = &inodes_stat,
1374 .maxlen = 2*sizeof(int),
1375 .mode = 0444,
1376 .proc_handler = &proc_dointvec,
1377 },
1378 {
1379 .ctl_name = FS_STATINODE,
1380 .procname = "inode-state",
1381 .data = &inodes_stat,
1382 .maxlen = 7*sizeof(int),
1383 .mode = 0444,
1384 .proc_handler = &proc_dointvec,
1385 },
1386 {
1387 .procname = "file-nr",
1388 .data = &files_stat,
1389 .maxlen = 3*sizeof(int),
1390 .mode = 0444,
1391 .proc_handler = &proc_nr_files,
1392 },
1393 {
1394 .ctl_name = FS_MAXFILE,
1395 .procname = "file-max",
1396 .data = &files_stat.max_files,
1397 .maxlen = sizeof(int),
1398 .mode = 0644,
1399 .proc_handler = &proc_dointvec,
1400 },
1401 {
1402 .ctl_name = CTL_UNNUMBERED,
1403 .procname = "nr_open",
1404 .data = &sysctl_nr_open,
1405 .maxlen = sizeof(int),
1406 .mode = 0644,
1407 .proc_handler = &proc_dointvec_minmax,
1408 .extra1 = &sysctl_nr_open_min,
1409 .extra2 = &sysctl_nr_open_max,
1410 },
1411 {
1412 .ctl_name = FS_DENTRY,
1413 .procname = "dentry-state",
1414 .data = &dentry_stat,
1415 .maxlen = 6*sizeof(int),
1416 .mode = 0444,
1417 .proc_handler = &proc_dointvec,
1418 },
1419 {
1420 .ctl_name = FS_OVERFLOWUID,
1421 .procname = "overflowuid",
1422 .data = &fs_overflowuid,
1423 .maxlen = sizeof(int),
1424 .mode = 0644,
1425 .proc_handler = &proc_dointvec_minmax,
1426 .strategy = &sysctl_intvec,
1427 .extra1 = &minolduid,
1428 .extra2 = &maxolduid,
1429 },
1430 {
1431 .ctl_name = FS_OVERFLOWGID,
1432 .procname = "overflowgid",
1433 .data = &fs_overflowgid,
1434 .maxlen = sizeof(int),
1435 .mode = 0644,
1436 .proc_handler = &proc_dointvec_minmax,
1437 .strategy = &sysctl_intvec,
1438 .extra1 = &minolduid,
1439 .extra2 = &maxolduid,
1440 },
1441 #ifdef CONFIG_FILE_LOCKING
1442 {
1443 .ctl_name = FS_LEASES,
1444 .procname = "leases-enable",
1445 .data = &leases_enable,
1446 .maxlen = sizeof(int),
1447 .mode = 0644,
1448 .proc_handler = &proc_dointvec,
1449 },
1450 #endif
1451 #ifdef CONFIG_DNOTIFY
1452 {
1453 .ctl_name = FS_DIR_NOTIFY,
1454 .procname = "dir-notify-enable",
1455 .data = &dir_notify_enable,
1456 .maxlen = sizeof(int),
1457 .mode = 0644,
1458 .proc_handler = &proc_dointvec,
1459 },
1460 #endif
1461 #ifdef CONFIG_MMU
1462 #ifdef CONFIG_FILE_LOCKING
1463 {
1464 .ctl_name = FS_LEASE_TIME,
1465 .procname = "lease-break-time",
1466 .data = &lease_break_time,
1467 .maxlen = sizeof(int),
1468 .mode = 0644,
1469 .proc_handler = &proc_dointvec,
1470 },
1471 #endif
1472 #ifdef CONFIG_AIO
1473 {
1474 .procname = "aio-nr",
1475 .data = &aio_nr,
1476 .maxlen = sizeof(aio_nr),
1477 .mode = 0444,
1478 .proc_handler = &proc_doulongvec_minmax,
1479 },
1480 {
1481 .procname = "aio-max-nr",
1482 .data = &aio_max_nr,
1483 .maxlen = sizeof(aio_max_nr),
1484 .mode = 0644,
1485 .proc_handler = &proc_doulongvec_minmax,
1486 },
1487 #endif /* CONFIG_AIO */
1488 #ifdef CONFIG_INOTIFY_USER
1489 {
1490 .ctl_name = FS_INOTIFY,
1491 .procname = "inotify",
1492 .mode = 0555,
1493 .child = inotify_table,
1494 },
1495 #endif
1496 #ifdef CONFIG_EPOLL
1497 {
1498 .procname = "epoll",
1499 .mode = 0555,
1500 .child = epoll_table,
1501 },
1502 #endif
1503 #endif
1504 {
1505 .ctl_name = KERN_SETUID_DUMPABLE,
1506 .procname = "suid_dumpable",
1507 .data = &suid_dumpable,
1508 .maxlen = sizeof(int),
1509 .mode = 0644,
1510 .proc_handler = &proc_dointvec_minmax,
1511 .strategy = &sysctl_intvec,
1512 .extra1 = &zero,
1513 .extra2 = &two,
1514 },
1515 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1516 {
1517 .ctl_name = CTL_UNNUMBERED,
1518 .procname = "binfmt_misc",
1519 .mode = 0555,
1520 .child = binfmt_misc_table,
1521 },
1522 #endif
1523 /*
1524 * NOTE: do not add new entries to this table unless you have read
1525 * Documentation/sysctl/ctl_unnumbered.txt
1526 */
1527 { .ctl_name = 0 }
1528 };
1529
1530 static struct ctl_table debug_table[] = {
1531 #if defined(CONFIG_X86) || defined(CONFIG_PPC)
1532 {
1533 .ctl_name = CTL_UNNUMBERED,
1534 .procname = "exception-trace",
1535 .data = &show_unhandled_signals,
1536 .maxlen = sizeof(int),
1537 .mode = 0644,
1538 .proc_handler = proc_dointvec
1539 },
1540 #endif
1541 { .ctl_name = 0 }
1542 };
1543
1544 static struct ctl_table dev_table[] = {
1545 { .ctl_name = 0 }
1546 };
1547
1548 static DEFINE_SPINLOCK(sysctl_lock);
1549
1550 /* called under sysctl_lock */
1551 static int use_table(struct ctl_table_header *p)
1552 {
1553 if (unlikely(p->unregistering))
1554 return 0;
1555 p->used++;
1556 return 1;
1557 }
1558
1559 /* called under sysctl_lock */
1560 static void unuse_table(struct ctl_table_header *p)
1561 {
1562 if (!--p->used)
1563 if (unlikely(p->unregistering))
1564 complete(p->unregistering);
1565 }
1566
1567 /* called under sysctl_lock, will reacquire if has to wait */
1568 static void start_unregistering(struct ctl_table_header *p)
1569 {
1570 /*
1571 * if p->used is 0, nobody will ever touch that entry again;
1572 * we'll eliminate all paths to it before dropping sysctl_lock
1573 */
1574 if (unlikely(p->used)) {
1575 struct completion wait;
1576 init_completion(&wait);
1577 p->unregistering = &wait;
1578 spin_unlock(&sysctl_lock);
1579 wait_for_completion(&wait);
1580 spin_lock(&sysctl_lock);
1581 } else {
1582 /* anything non-NULL; we'll never dereference it */
1583 p->unregistering = ERR_PTR(-EINVAL);
1584 }
1585 /*
1586 * do not remove from the list until nobody holds it; walking the
1587 * list in do_sysctl() relies on that.
1588 */
1589 list_del_init(&p->ctl_entry);
1590 }
1591
1592 void sysctl_head_get(struct ctl_table_header *head)
1593 {
1594 spin_lock(&sysctl_lock);
1595 head->count++;
1596 spin_unlock(&sysctl_lock);
1597 }
1598
1599 void sysctl_head_put(struct ctl_table_header *head)
1600 {
1601 spin_lock(&sysctl_lock);
1602 if (!--head->count)
1603 kfree(head);
1604 spin_unlock(&sysctl_lock);
1605 }
1606
1607 struct ctl_table_header *sysctl_head_grab(struct ctl_table_header *head)
1608 {
1609 if (!head)
1610 BUG();
1611 spin_lock(&sysctl_lock);
1612 if (!use_table(head))
1613 head = ERR_PTR(-ENOENT);
1614 spin_unlock(&sysctl_lock);
1615 return head;
1616 }
1617
1618 void sysctl_head_finish(struct ctl_table_header *head)
1619 {
1620 if (!head)
1621 return;
1622 spin_lock(&sysctl_lock);
1623 unuse_table(head);
1624 spin_unlock(&sysctl_lock);
1625 }
1626
1627 static struct ctl_table_set *
1628 lookup_header_set(struct ctl_table_root *root, struct nsproxy *namespaces)
1629 {
1630 struct ctl_table_set *set = &root->default_set;
1631 if (root->lookup)
1632 set = root->lookup(root, namespaces);
1633 return set;
1634 }
1635
1636 static struct list_head *
1637 lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces)
1638 {
1639 struct ctl_table_set *set = lookup_header_set(root, namespaces);
1640 return &set->list;
1641 }
1642
1643 struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces,
1644 struct ctl_table_header *prev)
1645 {
1646 struct ctl_table_root *root;
1647 struct list_head *header_list;
1648 struct ctl_table_header *head;
1649 struct list_head *tmp;
1650
1651 spin_lock(&sysctl_lock);
1652 if (prev) {
1653 head = prev;
1654 tmp = &prev->ctl_entry;
1655 unuse_table(prev);
1656 goto next;
1657 }
1658 tmp = &root_table_header.ctl_entry;
1659 for (;;) {
1660 head = list_entry(tmp, struct ctl_table_header, ctl_entry);
1661
1662 if (!use_table(head))
1663 goto next;
1664 spin_unlock(&sysctl_lock);
1665 return head;
1666 next:
1667 root = head->root;
1668 tmp = tmp->next;
1669 header_list = lookup_header_list(root, namespaces);
1670 if (tmp != header_list)
1671 continue;
1672
1673 do {
1674 root = list_entry(root->root_list.next,
1675 struct ctl_table_root, root_list);
1676 if (root == &sysctl_table_root)
1677 goto out;
1678 header_list = lookup_header_list(root, namespaces);
1679 } while (list_empty(header_list));
1680 tmp = header_list->next;
1681 }
1682 out:
1683 spin_unlock(&sysctl_lock);
1684 return NULL;
1685 }
1686
1687 struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev)
1688 {
1689 return __sysctl_head_next(current->nsproxy, prev);
1690 }
1691
1692 void register_sysctl_root(struct ctl_table_root *root)
1693 {
1694 spin_lock(&sysctl_lock);
1695 list_add_tail(&root->root_list, &sysctl_table_root.root_list);
1696 spin_unlock(&sysctl_lock);
1697 }
1698
1699 #ifdef CONFIG_SYSCTL_SYSCALL
1700 /* Perform the actual read/write of a sysctl table entry. */
1701 static int do_sysctl_strategy(struct ctl_table_root *root,
1702 struct ctl_table *table,
1703 void __user *oldval, size_t __user *oldlenp,
1704 void __user *newval, size_t newlen)
1705 {
1706 int op = 0, rc;
1707
1708 if (oldval)
1709 op |= MAY_READ;
1710 if (newval)
1711 op |= MAY_WRITE;
1712 if (sysctl_perm(root, table, op))
1713 return -EPERM;
1714
1715 if (table->strategy) {
1716 rc = table->strategy(table, oldval, oldlenp, newval, newlen);
1717 if (rc < 0)
1718 return rc;
1719 if (rc > 0)
1720 return 0;
1721 }
1722
1723 /* If there is no strategy routine, or if the strategy returns
1724 * zero, proceed with automatic r/w */
1725 if (table->data && table->maxlen) {
1726 rc = sysctl_data(table, oldval, oldlenp, newval, newlen);
1727 if (rc < 0)
1728 return rc;
1729 }
1730 return 0;
1731 }
1732
1733 static int parse_table(int __user *name, int nlen,
1734 void __user *oldval, size_t __user *oldlenp,
1735 void __user *newval, size_t newlen,
1736 struct ctl_table_root *root,
1737 struct ctl_table *table)
1738 {
1739 int n;
1740 repeat:
1741 if (!nlen)
1742 return -ENOTDIR;
1743 if (get_user(n, name))
1744 return -EFAULT;
1745 for ( ; table->ctl_name || table->procname; table++) {
1746 if (!table->ctl_name)
1747 continue;
1748 if (n == table->ctl_name) {
1749 int error;
1750 if (table->child) {
1751 if (sysctl_perm(root, table, MAY_EXEC))
1752 return -EPERM;
1753 name++;
1754 nlen--;
1755 table = table->child;
1756 goto repeat;
1757 }
1758 error = do_sysctl_strategy(root, table,
1759 oldval, oldlenp,
1760 newval, newlen);
1761 return error;
1762 }
1763 }
1764 return -ENOTDIR;
1765 }
1766
1767 int do_sysctl(int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp,
1768 void __user *newval, size_t newlen)
1769 {
1770 struct ctl_table_header *head;
1771 int error = -ENOTDIR;
1772
1773 if (nlen <= 0 || nlen >= CTL_MAXNAME)
1774 return -ENOTDIR;
1775 if (oldval) {
1776 int old_len;
1777 if (!oldlenp || get_user(old_len, oldlenp))
1778 return -EFAULT;
1779 }
1780
1781 for (head = sysctl_head_next(NULL); head;
1782 head = sysctl_head_next(head)) {
1783 error = parse_table(name, nlen, oldval, oldlenp,
1784 newval, newlen,
1785 head->root, head->ctl_table);
1786 if (error != -ENOTDIR) {
1787 sysctl_head_finish(head);
1788 break;
1789 }
1790 }
1791 return error;
1792 }
1793
1794 SYSCALL_DEFINE1(sysctl, struct __sysctl_args __user *, args)
1795 {
1796 struct __sysctl_args tmp;
1797 int error;
1798
1799 if (copy_from_user(&tmp, args, sizeof(tmp)))
1800 return -EFAULT;
1801
1802 error = deprecated_sysctl_warning(&tmp);
1803 if (error)
1804 goto out;
1805
1806 lock_kernel();
1807 error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp,
1808 tmp.newval, tmp.newlen);
1809 unlock_kernel();
1810 out:
1811 return error;
1812 }
1813 #endif /* CONFIG_SYSCTL_SYSCALL */
1814
1815 /*
1816 * sysctl_perm does NOT grant the superuser all rights automatically, because
1817 * some sysctl variables are readonly even to root.
1818 */
1819
1820 static int test_perm(int mode, int op)
1821 {
1822 if (!current_euid())
1823 mode >>= 6;
1824 else if (in_egroup_p(0))
1825 mode >>= 3;
1826 if ((op & ~mode & (MAY_READ|MAY_WRITE|MAY_EXEC)) == 0)
1827 return 0;
1828 return -EACCES;
1829 }
1830
1831 int sysctl_perm(struct ctl_table_root *root, struct ctl_table *table, int op)
1832 {
1833 int error;
1834 int mode;
1835
1836 error = security_sysctl(table, op & (MAY_READ | MAY_WRITE | MAY_EXEC));
1837 if (error)
1838 return error;
1839
1840 if (root->permissions)
1841 mode = root->permissions(root, current->nsproxy, table);
1842 else
1843 mode = table->mode;
1844
1845 return test_perm(mode, op);
1846 }
1847
1848 static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table)
1849 {
1850 for (; table->ctl_name || table->procname; table++) {
1851 table->parent = parent;
1852 if (table->child)
1853 sysctl_set_parent(table, table->child);
1854 }
1855 }
1856
1857 static __init int sysctl_init(void)
1858 {
1859 sysctl_set_parent(NULL, root_table);
1860 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK
1861 {
1862 int err;
1863 err = sysctl_check_table(current->nsproxy, root_table);
1864 }
1865 #endif
1866 return 0;
1867 }
1868
1869 core_initcall(sysctl_init);
1870
1871 static struct ctl_table *is_branch_in(struct ctl_table *branch,
1872 struct ctl_table *table)
1873 {
1874 struct ctl_table *p;
1875 const char *s = branch->procname;
1876
1877 /* branch should have named subdirectory as its first element */
1878 if (!s || !branch->child)
1879 return NULL;
1880
1881 /* ... and nothing else */
1882 if (branch[1].procname || branch[1].ctl_name)
1883 return NULL;
1884
1885 /* table should contain subdirectory with the same name */
1886 for (p = table; p->procname || p->ctl_name; p++) {
1887 if (!p->child)
1888 continue;
1889 if (p->procname && strcmp(p->procname, s) == 0)
1890 return p;
1891 }
1892 return NULL;
1893 }
1894
1895 /* see if attaching q to p would be an improvement */
1896 static void try_attach(struct ctl_table_header *p, struct ctl_table_header *q)
1897 {
1898 struct ctl_table *to = p->ctl_table, *by = q->ctl_table;
1899 struct ctl_table *next;
1900 int is_better = 0;
1901 int not_in_parent = !p->attached_by;
1902
1903 while ((next = is_branch_in(by, to)) != NULL) {
1904 if (by == q->attached_by)
1905 is_better = 1;
1906 if (to == p->attached_by)
1907 not_in_parent = 1;
1908 by = by->child;
1909 to = next->child;
1910 }
1911
1912 if (is_better && not_in_parent) {
1913 q->attached_by = by;
1914 q->attached_to = to;
1915 q->parent = p;
1916 }
1917 }
1918
1919 /**
1920 * __register_sysctl_paths - register a sysctl hierarchy
1921 * @root: List of sysctl headers to register on
1922 * @namespaces: Data to compute which lists of sysctl entries are visible
1923 * @path: The path to the directory the sysctl table is in.
1924 * @table: the top-level table structure
1925 *
1926 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1927 * array. A completely 0 filled entry terminates the table.
1928 *
1929 * The members of the &struct ctl_table structure are used as follows:
1930 *
1931 * ctl_name - This is the numeric sysctl value used by sysctl(2). The number
1932 * must be unique within that level of sysctl
1933 *
1934 * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1935 * enter a sysctl file
1936 *
1937 * data - a pointer to data for use by proc_handler
1938 *
1939 * maxlen - the maximum size in bytes of the data
1940 *
1941 * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1942 *
1943 * child - a pointer to the child sysctl table if this entry is a directory, or
1944 * %NULL.
1945 *
1946 * proc_handler - the text handler routine (described below)
1947 *
1948 * strategy - the strategy routine (described below)
1949 *
1950 * de - for internal use by the sysctl routines
1951 *
1952 * extra1, extra2 - extra pointers usable by the proc handler routines
1953 *
1954 * Leaf nodes in the sysctl tree will be represented by a single file
1955 * under /proc; non-leaf nodes will be represented by directories.
1956 *
1957 * sysctl(2) can automatically manage read and write requests through
1958 * the sysctl table. The data and maxlen fields of the ctl_table
1959 * struct enable minimal validation of the values being written to be
1960 * performed, and the mode field allows minimal authentication.
1961 *
1962 * More sophisticated management can be enabled by the provision of a
1963 * strategy routine with the table entry. This will be called before
1964 * any automatic read or write of the data is performed.
1965 *
1966 * The strategy routine may return
1967 *
1968 * < 0 - Error occurred (error is passed to user process)
1969 *
1970 * 0 - OK - proceed with automatic read or write.
1971 *
1972 * > 0 - OK - read or write has been done by the strategy routine, so
1973 * return immediately.
1974 *
1975 * There must be a proc_handler routine for any terminal nodes
1976 * mirrored under /proc/sys (non-terminals are handled by a built-in
1977 * directory handler). Several default handlers are available to
1978 * cover common cases -
1979 *
1980 * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
1981 * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(),
1982 * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
1983 *
1984 * It is the handler's job to read the input buffer from user memory
1985 * and process it. The handler should return 0 on success.
1986 *
1987 * This routine returns %NULL on a failure to register, and a pointer
1988 * to the table header on success.
1989 */
1990 struct ctl_table_header *__register_sysctl_paths(
1991 struct ctl_table_root *root,
1992 struct nsproxy *namespaces,
1993 const struct ctl_path *path, struct ctl_table *table)
1994 {
1995 struct ctl_table_header *header;
1996 struct ctl_table *new, **prevp;
1997 unsigned int n, npath;
1998 struct ctl_table_set *set;
1999
2000 /* Count the path components */
2001 for (npath = 0; path[npath].ctl_name || path[npath].procname; ++npath)
2002 ;
2003
2004 /*
2005 * For each path component, allocate a 2-element ctl_table array.
2006 * The first array element will be filled with the sysctl entry
2007 * for this, the second will be the sentinel (ctl_name == 0).
2008 *
2009 * We allocate everything in one go so that we don't have to
2010 * worry about freeing additional memory in unregister_sysctl_table.
2011 */
2012 header = kzalloc(sizeof(struct ctl_table_header) +
2013 (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL);
2014 if (!header)
2015 return NULL;
2016
2017 new = (struct ctl_table *) (header + 1);
2018
2019 /* Now connect the dots */
2020 prevp = &header->ctl_table;
2021 for (n = 0; n < npath; ++n, ++path) {
2022 /* Copy the procname */
2023 new->procname = path->procname;
2024 new->ctl_name = path->ctl_name;
2025 new->mode = 0555;
2026
2027 *prevp = new;
2028 prevp = &new->child;
2029
2030 new += 2;
2031 }
2032 *prevp = table;
2033 header->ctl_table_arg = table;
2034
2035 INIT_LIST_HEAD(&header->ctl_entry);
2036 header->used = 0;
2037 header->unregistering = NULL;
2038 header->root = root;
2039 sysctl_set_parent(NULL, header->ctl_table);
2040 header->count = 1;
2041 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK
2042 if (sysctl_check_table(namespaces, header->ctl_table)) {
2043 kfree(header);
2044 return NULL;
2045 }
2046 #endif
2047 spin_lock(&sysctl_lock);
2048 header->set = lookup_header_set(root, namespaces);
2049 header->attached_by = header->ctl_table;
2050 header->attached_to = root_table;
2051 header->parent = &root_table_header;
2052 for (set = header->set; set; set = set->parent) {
2053 struct ctl_table_header *p;
2054 list_for_each_entry(p, &set->list, ctl_entry) {
2055 if (p->unregistering)
2056 continue;
2057 try_attach(p, header);
2058 }
2059 }
2060 header->parent->count++;
2061 list_add_tail(&header->ctl_entry, &header->set->list);
2062 spin_unlock(&sysctl_lock);
2063
2064 return header;
2065 }
2066
2067 /**
2068 * register_sysctl_table_path - register a sysctl table hierarchy
2069 * @path: The path to the directory the sysctl table is in.
2070 * @table: the top-level table structure
2071 *
2072 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
2073 * array. A completely 0 filled entry terminates the table.
2074 *
2075 * See __register_sysctl_paths for more details.
2076 */
2077 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
2078 struct ctl_table *table)
2079 {
2080 return __register_sysctl_paths(&sysctl_table_root, current->nsproxy,
2081 path, table);
2082 }
2083
2084 /**
2085 * register_sysctl_table - register a sysctl table hierarchy
2086 * @table: the top-level table structure
2087 *
2088 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
2089 * array. A completely 0 filled entry terminates the table.
2090 *
2091 * See register_sysctl_paths for more details.
2092 */
2093 struct ctl_table_header *register_sysctl_table(struct ctl_table *table)
2094 {
2095 static const struct ctl_path null_path[] = { {} };
2096
2097 return register_sysctl_paths(null_path, table);
2098 }
2099
2100 /**
2101 * unregister_sysctl_table - unregister a sysctl table hierarchy
2102 * @header: the header returned from register_sysctl_table
2103 *
2104 * Unregisters the sysctl table and all children. proc entries may not
2105 * actually be removed until they are no longer used by anyone.
2106 */
2107 void unregister_sysctl_table(struct ctl_table_header * header)
2108 {
2109 might_sleep();
2110
2111 if (header == NULL)
2112 return;
2113
2114 spin_lock(&sysctl_lock);
2115 start_unregistering(header);
2116 if (!--header->parent->count) {
2117 WARN_ON(1);
2118 kfree(header->parent);
2119 }
2120 if (!--header->count)
2121 kfree(header);
2122 spin_unlock(&sysctl_lock);
2123 }
2124
2125 int sysctl_is_seen(struct ctl_table_header *p)
2126 {
2127 struct ctl_table_set *set = p->set;
2128 int res;
2129 spin_lock(&sysctl_lock);
2130 if (p->unregistering)
2131 res = 0;
2132 else if (!set->is_seen)
2133 res = 1;
2134 else
2135 res = set->is_seen(set);
2136 spin_unlock(&sysctl_lock);
2137 return res;
2138 }
2139
2140 void setup_sysctl_set(struct ctl_table_set *p,
2141 struct ctl_table_set *parent,
2142 int (*is_seen)(struct ctl_table_set *))
2143 {
2144 INIT_LIST_HEAD(&p->list);
2145 p->parent = parent ? parent : &sysctl_table_root.default_set;
2146 p->is_seen = is_seen;
2147 }
2148
2149 #else /* !CONFIG_SYSCTL */
2150 struct ctl_table_header *register_sysctl_table(struct ctl_table * table)
2151 {
2152 return NULL;
2153 }
2154
2155 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
2156 struct ctl_table *table)
2157 {
2158 return NULL;
2159 }
2160
2161 void unregister_sysctl_table(struct ctl_table_header * table)
2162 {
2163 }
2164
2165 void setup_sysctl_set(struct ctl_table_set *p,
2166 struct ctl_table_set *parent,
2167 int (*is_seen)(struct ctl_table_set *))
2168 {
2169 }
2170
2171 void sysctl_head_put(struct ctl_table_header *head)
2172 {
2173 }
2174
2175 #endif /* CONFIG_SYSCTL */
2176
2177 /*
2178 * /proc/sys support
2179 */
2180
2181 #ifdef CONFIG_PROC_SYSCTL
2182
2183 static int _proc_do_string(void* data, int maxlen, int write,
2184 struct file *filp, void __user *buffer,
2185 size_t *lenp, loff_t *ppos)
2186 {
2187 size_t len;
2188 char __user *p;
2189 char c;
2190
2191 if (!data || !maxlen || !*lenp) {
2192 *lenp = 0;
2193 return 0;
2194 }
2195
2196 if (write) {
2197 len = 0;
2198 p = buffer;
2199 while (len < *lenp) {
2200 if (get_user(c, p++))
2201 return -EFAULT;
2202 if (c == 0 || c == '\n')
2203 break;
2204 len++;
2205 }
2206 if (len >= maxlen)
2207 len = maxlen-1;
2208 if(copy_from_user(data, buffer, len))
2209 return -EFAULT;
2210 ((char *) data)[len] = 0;
2211 *ppos += *lenp;
2212 } else {
2213 len = strlen(data);
2214 if (len > maxlen)
2215 len = maxlen;
2216
2217 if (*ppos > len) {
2218 *lenp = 0;
2219 return 0;
2220 }
2221
2222 data += *ppos;
2223 len -= *ppos;
2224
2225 if (len > *lenp)
2226 len = *lenp;
2227 if (len)
2228 if(copy_to_user(buffer, data, len))
2229 return -EFAULT;
2230 if (len < *lenp) {
2231 if(put_user('\n', ((char __user *) buffer) + len))
2232 return -EFAULT;
2233 len++;
2234 }
2235 *lenp = len;
2236 *ppos += len;
2237 }
2238 return 0;
2239 }
2240
2241 /**
2242 * proc_dostring - read a string sysctl
2243 * @table: the sysctl table
2244 * @write: %TRUE if this is a write to the sysctl file
2245 * @filp: the file structure
2246 * @buffer: the user buffer
2247 * @lenp: the size of the user buffer
2248 * @ppos: file position
2249 *
2250 * Reads/writes a string from/to the user buffer. If the kernel
2251 * buffer provided is not large enough to hold the string, the
2252 * string is truncated. The copied string is %NULL-terminated.
2253 * If the string is being read by the user process, it is copied
2254 * and a newline '\n' is added. It is truncated if the buffer is
2255 * not large enough.
2256 *
2257 * Returns 0 on success.
2258 */
2259 int proc_dostring(struct ctl_table *table, int write, struct file *filp,
2260 void __user *buffer, size_t *lenp, loff_t *ppos)
2261 {
2262 return _proc_do_string(table->data, table->maxlen, write, filp,
2263 buffer, lenp, ppos);
2264 }
2265
2266
2267 static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp,
2268 int *valp,
2269 int write, void *data)
2270 {
2271 if (write) {
2272 *valp = *negp ? -*lvalp : *lvalp;
2273 } else {
2274 int val = *valp;
2275 if (val < 0) {
2276 *negp = -1;
2277 *lvalp = (unsigned long)-val;
2278 } else {
2279 *negp = 0;
2280 *lvalp = (unsigned long)val;
2281 }
2282 }
2283 return 0;
2284 }
2285
2286 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
2287 int write, struct file *filp, void __user *buffer,
2288 size_t *lenp, loff_t *ppos,
2289 int (*conv)(int *negp, unsigned long *lvalp, int *valp,
2290 int write, void *data),
2291 void *data)
2292 {
2293 #define TMPBUFLEN 21
2294 int *i, vleft, first = 1, neg;
2295 unsigned long lval;
2296 size_t left, len;
2297
2298 char buf[TMPBUFLEN], *p;
2299 char __user *s = buffer;
2300
2301 if (!tbl_data || !table->maxlen || !*lenp ||
2302 (*ppos && !write)) {
2303 *lenp = 0;
2304 return 0;
2305 }
2306
2307 i = (int *) tbl_data;
2308 vleft = table->maxlen / sizeof(*i);
2309 left = *lenp;
2310
2311 if (!conv)
2312 conv = do_proc_dointvec_conv;
2313
2314 for (; left && vleft--; i++, first=0) {
2315 if (write) {
2316 while (left) {
2317 char c;
2318 if (get_user(c, s))
2319 return -EFAULT;
2320 if (!isspace(c))
2321 break;
2322 left--;
2323 s++;
2324 }
2325 if (!left)
2326 break;
2327 neg = 0;
2328 len = left;
2329 if (len > sizeof(buf) - 1)
2330 len = sizeof(buf) - 1;
2331 if (copy_from_user(buf, s, len))
2332 return -EFAULT;
2333 buf[len] = 0;
2334 p = buf;
2335 if (*p == '-' && left > 1) {
2336 neg = 1;
2337 p++;
2338 }
2339 if (*p < '0' || *p > '9')
2340 break;
2341
2342 lval = simple_strtoul(p, &p, 0);
2343
2344 len = p-buf;
2345 if ((len < left) && *p && !isspace(*p))
2346 break;
2347 s += len;
2348 left -= len;
2349
2350 if (conv(&neg, &lval, i, 1, data))
2351 break;
2352 } else {
2353 p = buf;
2354 if (!first)
2355 *p++ = '\t';
2356
2357 if (conv(&neg, &lval, i, 0, data))
2358 break;
2359
2360 sprintf(p, "%s%lu", neg ? "-" : "", lval);
2361 len = strlen(buf);
2362 if (len > left)
2363 len = left;
2364 if(copy_to_user(s, buf, len))
2365 return -EFAULT;
2366 left -= len;
2367 s += len;
2368 }
2369 }
2370
2371 if (!write && !first && left) {
2372 if(put_user('\n', s))
2373 return -EFAULT;
2374 left--, s++;
2375 }
2376 if (write) {
2377 while (left) {
2378 char c;
2379 if (get_user(c, s++))
2380 return -EFAULT;
2381 if (!isspace(c))
2382 break;
2383 left--;
2384 }
2385 }
2386 if (write && first)
2387 return -EINVAL;
2388 *lenp -= left;
2389 *ppos += *lenp;
2390 return 0;
2391 #undef TMPBUFLEN
2392 }
2393
2394 static int do_proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2395 void __user *buffer, size_t *lenp, loff_t *ppos,
2396 int (*conv)(int *negp, unsigned long *lvalp, int *valp,
2397 int write, void *data),
2398 void *data)
2399 {
2400 return __do_proc_dointvec(table->data, table, write, filp,
2401 buffer, lenp, ppos, conv, data);
2402 }
2403
2404 /**
2405 * proc_dointvec - read a vector of integers
2406 * @table: the sysctl table
2407 * @write: %TRUE if this is a write to the sysctl file
2408 * @filp: the file structure
2409 * @buffer: the user buffer
2410 * @lenp: the size of the user buffer
2411 * @ppos: file position
2412 *
2413 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2414 * values from/to the user buffer, treated as an ASCII string.
2415 *
2416 * Returns 0 on success.
2417 */
2418 int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2419 void __user *buffer, size_t *lenp, loff_t *ppos)
2420 {
2421 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2422 NULL,NULL);
2423 }
2424
2425 /*
2426 * Taint values can only be increased
2427 * This means we can safely use a temporary.
2428 */
2429 static int proc_taint(struct ctl_table *table, int write, struct file *filp,
2430 void __user *buffer, size_t *lenp, loff_t *ppos)
2431 {
2432 struct ctl_table t;
2433 unsigned long tmptaint = get_taint();
2434 int err;
2435
2436 if (write && !capable(CAP_SYS_ADMIN))
2437 return -EPERM;
2438
2439 t = *table;
2440 t.data = &tmptaint;
2441 err = proc_doulongvec_minmax(&t, write, filp, buffer, lenp, ppos);
2442 if (err < 0)
2443 return err;
2444
2445 if (write) {
2446 /*
2447 * Poor man's atomic or. Not worth adding a primitive
2448 * to everyone's atomic.h for this
2449 */
2450 int i;
2451 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2452 if ((tmptaint >> i) & 1)
2453 add_taint(i);
2454 }
2455 }
2456
2457 return err;
2458 }
2459
2460 struct do_proc_dointvec_minmax_conv_param {
2461 int *min;
2462 int *max;
2463 };
2464
2465 static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp,
2466 int *valp,
2467 int write, void *data)
2468 {
2469 struct do_proc_dointvec_minmax_conv_param *param = data;
2470 if (write) {
2471 int val = *negp ? -*lvalp : *lvalp;
2472 if ((param->min && *param->min > val) ||
2473 (param->max && *param->max < val))
2474 return -EINVAL;
2475 *valp = val;
2476 } else {
2477 int val = *valp;
2478 if (val < 0) {
2479 *negp = -1;
2480 *lvalp = (unsigned long)-val;
2481 } else {
2482 *negp = 0;
2483 *lvalp = (unsigned long)val;
2484 }
2485 }
2486 return 0;
2487 }
2488
2489 /**
2490 * proc_dointvec_minmax - read a vector of integers with min/max values
2491 * @table: the sysctl table
2492 * @write: %TRUE if this is a write to the sysctl file
2493 * @filp: the file structure
2494 * @buffer: the user buffer
2495 * @lenp: the size of the user buffer
2496 * @ppos: file position
2497 *
2498 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2499 * values from/to the user buffer, treated as an ASCII string.
2500 *
2501 * This routine will ensure the values are within the range specified by
2502 * table->extra1 (min) and table->extra2 (max).
2503 *
2504 * Returns 0 on success.
2505 */
2506 int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
2507 void __user *buffer, size_t *lenp, loff_t *ppos)
2508 {
2509 struct do_proc_dointvec_minmax_conv_param param = {
2510 .min = (int *) table->extra1,
2511 .max = (int *) table->extra2,
2512 };
2513 return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2514 do_proc_dointvec_minmax_conv, &param);
2515 }
2516
2517 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2518 struct file *filp,
2519 void __user *buffer,
2520 size_t *lenp, loff_t *ppos,
2521 unsigned long convmul,
2522 unsigned long convdiv)
2523 {
2524 #define TMPBUFLEN 21
2525 unsigned long *i, *min, *max, val;
2526 int vleft, first=1, neg;
2527 size_t len, left;
2528 char buf[TMPBUFLEN], *p;
2529 char __user *s = buffer;
2530
2531 if (!data || !table->maxlen || !*lenp ||
2532 (*ppos && !write)) {
2533 *lenp = 0;
2534 return 0;
2535 }
2536
2537 i = (unsigned long *) data;
2538 min = (unsigned long *) table->extra1;
2539 max = (unsigned long *) table->extra2;
2540 vleft = table->maxlen / sizeof(unsigned long);
2541 left = *lenp;
2542
2543 for (; left && vleft--; i++, min++, max++, first=0) {
2544 if (write) {
2545 while (left) {
2546 char c;
2547 if (get_user(c, s))
2548 return -EFAULT;
2549 if (!isspace(c))
2550 break;
2551 left--;
2552 s++;
2553 }
2554 if (!left)
2555 break;
2556 neg = 0;
2557 len = left;
2558 if (len > TMPBUFLEN-1)
2559 len = TMPBUFLEN-1;
2560 if (copy_from_user(buf, s, len))
2561 return -EFAULT;
2562 buf[len] = 0;
2563 p = buf;
2564 if (*p == '-' && left > 1) {
2565 neg = 1;
2566 p++;
2567 }
2568 if (*p < '0' || *p > '9')
2569 break;
2570 val = simple_strtoul(p, &p, 0) * convmul / convdiv ;
2571 len = p-buf;
2572 if ((len < left) && *p && !isspace(*p))
2573 break;
2574 if (neg)
2575 val = -val;
2576 s += len;
2577 left -= len;
2578
2579 if(neg)
2580 continue;
2581 if ((min && val < *min) || (max && val > *max))
2582 continue;
2583 *i = val;
2584 } else {
2585 p = buf;
2586 if (!first)
2587 *p++ = '\t';
2588 sprintf(p, "%lu", convdiv * (*i) / convmul);
2589 len = strlen(buf);
2590 if (len > left)
2591 len = left;
2592 if(copy_to_user(s, buf, len))
2593 return -EFAULT;
2594 left -= len;
2595 s += len;
2596 }
2597 }
2598
2599 if (!write && !first && left) {
2600 if(put_user('\n', s))
2601 return -EFAULT;
2602 left--, s++;
2603 }
2604 if (write) {
2605 while (left) {
2606 char c;
2607 if (get_user(c, s++))
2608 return -EFAULT;
2609 if (!isspace(c))
2610 break;
2611 left--;
2612 }
2613 }
2614 if (write && first)
2615 return -EINVAL;
2616 *lenp -= left;
2617 *ppos += *lenp;
2618 return 0;
2619 #undef TMPBUFLEN
2620 }
2621
2622 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2623 struct file *filp,
2624 void __user *buffer,
2625 size_t *lenp, loff_t *ppos,
2626 unsigned long convmul,
2627 unsigned long convdiv)
2628 {
2629 return __do_proc_doulongvec_minmax(table->data, table, write,
2630 filp, buffer, lenp, ppos, convmul, convdiv);
2631 }
2632
2633 /**
2634 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2635 * @table: the sysctl table
2636 * @write: %TRUE if this is a write to the sysctl file
2637 * @filp: the file structure
2638 * @buffer: the user buffer
2639 * @lenp: the size of the user buffer
2640 * @ppos: file position
2641 *
2642 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2643 * values from/to the user buffer, treated as an ASCII string.
2644 *
2645 * This routine will ensure the values are within the range specified by
2646 * table->extra1 (min) and table->extra2 (max).
2647 *
2648 * Returns 0 on success.
2649 */
2650 int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
2651 void __user *buffer, size_t *lenp, loff_t *ppos)
2652 {
2653 return do_proc_doulongvec_minmax(table, write, filp, buffer, lenp, ppos, 1l, 1l);
2654 }
2655
2656 /**
2657 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2658 * @table: the sysctl table
2659 * @write: %TRUE if this is a write to the sysctl file
2660 * @filp: the file structure
2661 * @buffer: the user buffer
2662 * @lenp: the size of the user buffer
2663 * @ppos: file position
2664 *
2665 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2666 * values from/to the user buffer, treated as an ASCII string. The values
2667 * are treated as milliseconds, and converted to jiffies when they are stored.
2668 *
2669 * This routine will ensure the values are within the range specified by
2670 * table->extra1 (min) and table->extra2 (max).
2671 *
2672 * Returns 0 on success.
2673 */
2674 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2675 struct file *filp,
2676 void __user *buffer,
2677 size_t *lenp, loff_t *ppos)
2678 {
2679 return do_proc_doulongvec_minmax(table, write, filp, buffer,
2680 lenp, ppos, HZ, 1000l);
2681 }
2682
2683
2684 static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp,
2685 int *valp,
2686 int write, void *data)
2687 {
2688 if (write) {
2689 if (*lvalp > LONG_MAX / HZ)
2690 return 1;
2691 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2692 } else {
2693 int val = *valp;
2694 unsigned long lval;
2695 if (val < 0) {
2696 *negp = -1;
2697 lval = (unsigned long)-val;
2698 } else {
2699 *negp = 0;
2700 lval = (unsigned long)val;
2701 }
2702 *lvalp = lval / HZ;
2703 }
2704 return 0;
2705 }
2706
2707 static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp,
2708 int *valp,
2709 int write, void *data)
2710 {
2711 if (write) {
2712 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2713 return 1;
2714 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2715 } else {
2716 int val = *valp;
2717 unsigned long lval;
2718 if (val < 0) {
2719 *negp = -1;
2720 lval = (unsigned long)-val;
2721 } else {
2722 *negp = 0;
2723 lval = (unsigned long)val;
2724 }
2725 *lvalp = jiffies_to_clock_t(lval);
2726 }
2727 return 0;
2728 }
2729
2730 static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp,
2731 int *valp,
2732 int write, void *data)
2733 {
2734 if (write) {
2735 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2736 } else {
2737 int val = *valp;
2738 unsigned long lval;
2739 if (val < 0) {
2740 *negp = -1;
2741 lval = (unsigned long)-val;
2742 } else {
2743 *negp = 0;
2744 lval = (unsigned long)val;
2745 }
2746 *lvalp = jiffies_to_msecs(lval);
2747 }
2748 return 0;
2749 }
2750
2751 /**
2752 * proc_dointvec_jiffies - read a vector of integers as seconds
2753 * @table: the sysctl table
2754 * @write: %TRUE if this is a write to the sysctl file
2755 * @filp: the file structure
2756 * @buffer: the user buffer
2757 * @lenp: the size of the user buffer
2758 * @ppos: file position
2759 *
2760 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2761 * values from/to the user buffer, treated as an ASCII string.
2762 * The values read are assumed to be in seconds, and are converted into
2763 * jiffies.
2764 *
2765 * Returns 0 on success.
2766 */
2767 int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
2768 void __user *buffer, size_t *lenp, loff_t *ppos)
2769 {
2770 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2771 do_proc_dointvec_jiffies_conv,NULL);
2772 }
2773
2774 /**
2775 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2776 * @table: the sysctl table
2777 * @write: %TRUE if this is a write to the sysctl file
2778 * @filp: the file structure
2779 * @buffer: the user buffer
2780 * @lenp: the size of the user buffer
2781 * @ppos: pointer to the file position
2782 *
2783 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2784 * values from/to the user buffer, treated as an ASCII string.
2785 * The values read are assumed to be in 1/USER_HZ seconds, and
2786 * are converted into jiffies.
2787 *
2788 * Returns 0 on success.
2789 */
2790 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
2791 void __user *buffer, size_t *lenp, loff_t *ppos)
2792 {
2793 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2794 do_proc_dointvec_userhz_jiffies_conv,NULL);
2795 }
2796
2797 /**
2798 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2799 * @table: the sysctl table
2800 * @write: %TRUE if this is a write to the sysctl file
2801 * @filp: the file structure
2802 * @buffer: the user buffer
2803 * @lenp: the size of the user buffer
2804 * @ppos: file position
2805 * @ppos: the current position in the file
2806 *
2807 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2808 * values from/to the user buffer, treated as an ASCII string.
2809 * The values read are assumed to be in 1/1000 seconds, and
2810 * are converted into jiffies.
2811 *
2812 * Returns 0 on success.
2813 */
2814 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
2815 void __user *buffer, size_t *lenp, loff_t *ppos)
2816 {
2817 return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2818 do_proc_dointvec_ms_jiffies_conv, NULL);
2819 }
2820
2821 static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
2822 void __user *buffer, size_t *lenp, loff_t *ppos)
2823 {
2824 struct pid *new_pid;
2825 pid_t tmp;
2826 int r;
2827
2828 tmp = pid_vnr(cad_pid);
2829
2830 r = __do_proc_dointvec(&tmp, table, write, filp, buffer,
2831 lenp, ppos, NULL, NULL);
2832 if (r || !write)
2833 return r;
2834
2835 new_pid = find_get_pid(tmp);
2836 if (!new_pid)
2837 return -ESRCH;
2838
2839 put_pid(xchg(&cad_pid, new_pid));
2840 return 0;
2841 }
2842
2843 #else /* CONFIG_PROC_FS */
2844
2845 int proc_dostring(struct ctl_table *table, int write, struct file *filp,
2846 void __user *buffer, size_t *lenp, loff_t *ppos)
2847 {
2848 return -ENOSYS;
2849 }
2850
2851 int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2852 void __user *buffer, size_t *lenp, loff_t *ppos)
2853 {
2854 return -ENOSYS;
2855 }
2856
2857 int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
2858 void __user *buffer, size_t *lenp, loff_t *ppos)
2859 {
2860 return -ENOSYS;
2861 }
2862
2863 int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
2864 void __user *buffer, size_t *lenp, loff_t *ppos)
2865 {
2866 return -ENOSYS;
2867 }
2868
2869 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
2870 void __user *buffer, size_t *lenp, loff_t *ppos)
2871 {
2872 return -ENOSYS;
2873 }
2874
2875 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
2876 void __user *buffer, size_t *lenp, loff_t *ppos)
2877 {
2878 return -ENOSYS;
2879 }
2880
2881 int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
2882 void __user *buffer, size_t *lenp, loff_t *ppos)
2883 {
2884 return -ENOSYS;
2885 }
2886
2887 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2888 struct file *filp,
2889 void __user *buffer,
2890 size_t *lenp, loff_t *ppos)
2891 {
2892 return -ENOSYS;
2893 }
2894
2895
2896 #endif /* CONFIG_PROC_FS */
2897
2898
2899 #ifdef CONFIG_SYSCTL_SYSCALL
2900 /*
2901 * General sysctl support routines
2902 */
2903
2904 /* The generic sysctl data routine (used if no strategy routine supplied) */
2905 int sysctl_data(struct ctl_table *table,
2906 void __user *oldval, size_t __user *oldlenp,
2907 void __user *newval, size_t newlen)
2908 {
2909 size_t len;
2910
2911 /* Get out of I don't have a variable */
2912 if (!table->data || !table->maxlen)
2913 return -ENOTDIR;
2914
2915 if (oldval && oldlenp) {
2916 if (get_user(len, oldlenp))
2917 return -EFAULT;
2918 if (len) {
2919 if (len > table->maxlen)
2920 len = table->maxlen;
2921 if (copy_to_user(oldval, table->data, len))
2922 return -EFAULT;
2923 if (put_user(len, oldlenp))
2924 return -EFAULT;
2925 }
2926 }
2927
2928 if (newval && newlen) {
2929 if (newlen > table->maxlen)
2930 newlen = table->maxlen;
2931
2932 if (copy_from_user(table->data, newval, newlen))
2933 return -EFAULT;
2934 }
2935 return 1;
2936 }
2937
2938 /* The generic string strategy routine: */
2939 int sysctl_string(struct ctl_table *table,
2940 void __user *oldval, size_t __user *oldlenp,
2941 void __user *newval, size_t newlen)
2942 {
2943 if (!table->data || !table->maxlen)
2944 return -ENOTDIR;
2945
2946 if (oldval && oldlenp) {
2947 size_t bufsize;
2948 if (get_user(bufsize, oldlenp))
2949 return -EFAULT;
2950 if (bufsize) {
2951 size_t len = strlen(table->data), copied;
2952
2953 /* This shouldn't trigger for a well-formed sysctl */
2954 if (len > table->maxlen)
2955 len = table->maxlen;
2956
2957 /* Copy up to a max of bufsize-1 bytes of the string */
2958 copied = (len >= bufsize) ? bufsize - 1 : len;
2959
2960 if (copy_to_user(oldval, table->data, copied) ||
2961 put_user(0, (char __user *)(oldval + copied)))
2962 return -EFAULT;
2963 if (put_user(len, oldlenp))
2964 return -EFAULT;
2965 }
2966 }
2967 if (newval && newlen) {
2968 size_t len = newlen;
2969 if (len > table->maxlen)
2970 len = table->maxlen;
2971 if(copy_from_user(table->data, newval, len))
2972 return -EFAULT;
2973 if (len == table->maxlen)
2974 len--;
2975 ((char *) table->data)[len] = 0;
2976 }
2977 return 1;
2978 }
2979
2980 /*
2981 * This function makes sure that all of the integers in the vector
2982 * are between the minimum and maximum values given in the arrays
2983 * table->extra1 and table->extra2, respectively.
2984 */
2985 int sysctl_intvec(struct ctl_table *table,
2986 void __user *oldval, size_t __user *oldlenp,
2987 void __user *newval, size_t newlen)
2988 {
2989
2990 if (newval && newlen) {
2991 int __user *vec = (int __user *) newval;
2992 int *min = (int *) table->extra1;
2993 int *max = (int *) table->extra2;
2994 size_t length;
2995 int i;
2996
2997 if (newlen % sizeof(int) != 0)
2998 return -EINVAL;
2999
3000 if (!table->extra1 && !table->extra2)
3001 return 0;
3002
3003 if (newlen > table->maxlen)
3004 newlen = table->maxlen;
3005 length = newlen / sizeof(int);
3006
3007 for (i = 0; i < length; i++) {
3008 int value;
3009 if (get_user(value, vec + i))
3010 return -EFAULT;
3011 if (min && value < min[i])
3012 return -EINVAL;
3013 if (max && value > max[i])
3014 return -EINVAL;
3015 }
3016 }
3017 return 0;
3018 }
3019
3020 /* Strategy function to convert jiffies to seconds */
3021 int sysctl_jiffies(struct ctl_table *table,
3022 void __user *oldval, size_t __user *oldlenp,
3023 void __user *newval, size_t newlen)
3024 {
3025 if (oldval && oldlenp) {
3026 size_t olen;
3027
3028 if (get_user(olen, oldlenp))
3029 return -EFAULT;
3030 if (olen) {
3031 int val;
3032
3033 if (olen < sizeof(int))
3034 return -EINVAL;
3035
3036 val = *(int *)(table->data) / HZ;
3037 if (put_user(val, (int __user *)oldval))
3038 return -EFAULT;
3039 if (put_user(sizeof(int), oldlenp))
3040 return -EFAULT;
3041 }
3042 }
3043 if (newval && newlen) {
3044 int new;
3045 if (newlen != sizeof(int))
3046 return -EINVAL;
3047 if (get_user(new, (int __user *)newval))
3048 return -EFAULT;
3049 *(int *)(table->data) = new*HZ;
3050 }
3051 return 1;
3052 }
3053
3054 /* Strategy function to convert jiffies to seconds */
3055 int sysctl_ms_jiffies(struct ctl_table *table,
3056 void __user *oldval, size_t __user *oldlenp,
3057 void __user *newval, size_t newlen)
3058 {
3059 if (oldval && oldlenp) {
3060 size_t olen;
3061
3062 if (get_user(olen, oldlenp))
3063 return -EFAULT;
3064 if (olen) {
3065 int val;
3066
3067 if (olen < sizeof(int))
3068 return -EINVAL;
3069
3070 val = jiffies_to_msecs(*(int *)(table->data));
3071 if (put_user(val, (int __user *)oldval))
3072 return -EFAULT;
3073 if (put_user(sizeof(int), oldlenp))
3074 return -EFAULT;
3075 }
3076 }
3077 if (newval && newlen) {
3078 int new;
3079 if (newlen != sizeof(int))
3080 return -EINVAL;
3081 if (get_user(new, (int __user *)newval))
3082 return -EFAULT;
3083 *(int *)(table->data) = msecs_to_jiffies(new);
3084 }
3085 return 1;
3086 }
3087
3088
3089
3090 #else /* CONFIG_SYSCTL_SYSCALL */
3091
3092
3093 SYSCALL_DEFINE1(sysctl, struct __sysctl_args __user *, args)
3094 {
3095 struct __sysctl_args tmp;
3096 int error;
3097
3098 if (copy_from_user(&tmp, args, sizeof(tmp)))
3099 return -EFAULT;
3100
3101 error = deprecated_sysctl_warning(&tmp);
3102
3103 /* If no error reading the parameters then just -ENOSYS ... */
3104 if (!error)
3105 error = -ENOSYS;
3106
3107 return error;
3108 }
3109
3110 int sysctl_data(struct ctl_table *table,
3111 void __user *oldval, size_t __user *oldlenp,
3112 void __user *newval, size_t newlen)
3113 {
3114 return -ENOSYS;
3115 }
3116
3117 int sysctl_string(struct ctl_table *table,
3118 void __user *oldval, size_t __user *oldlenp,
3119 void __user *newval, size_t newlen)
3120 {
3121 return -ENOSYS;
3122 }
3123
3124 int sysctl_intvec(struct ctl_table *table,
3125 void __user *oldval, size_t __user *oldlenp,
3126 void __user *newval, size_t newlen)
3127 {
3128 return -ENOSYS;
3129 }
3130
3131 int sysctl_jiffies(struct ctl_table *table,
3132 void __user *oldval, size_t __user *oldlenp,
3133 void __user *newval, size_t newlen)
3134 {
3135 return -ENOSYS;
3136 }
3137
3138 int sysctl_ms_jiffies(struct ctl_table *table,
3139 void __user *oldval, size_t __user *oldlenp,
3140 void __user *newval, size_t newlen)
3141 {
3142 return -ENOSYS;
3143 }
3144
3145 #endif /* CONFIG_SYSCTL_SYSCALL */
3146
3147 static int deprecated_sysctl_warning(struct __sysctl_args *args)
3148 {
3149 static int msg_count;
3150 int name[CTL_MAXNAME];
3151 int i;
3152
3153 /* Check args->nlen. */
3154 if (args->nlen < 0 || args->nlen > CTL_MAXNAME)
3155 return -ENOTDIR;
3156
3157 /* Read in the sysctl name for better debug message logging */
3158 for (i = 0; i < args->nlen; i++)
3159 if (get_user(name[i], args->name + i))
3160 return -EFAULT;
3161
3162 /* Ignore accesses to kernel.version */
3163 if ((args->nlen == 2) && (name[0] == CTL_KERN) && (name[1] == KERN_VERSION))
3164 return 0;
3165
3166 if (msg_count < 5) {
3167 msg_count++;
3168 printk(KERN_INFO
3169 "warning: process `%s' used the deprecated sysctl "
3170 "system call with ", current->comm);
3171 for (i = 0; i < args->nlen; i++)
3172 printk("%d.", name[i]);
3173 printk("\n");
3174 }
3175 return 0;
3176 }
3177
3178 /*
3179 * No sense putting this after each symbol definition, twice,
3180 * exception granted :-)
3181 */
3182 EXPORT_SYMBOL(proc_dointvec);
3183 EXPORT_SYMBOL(proc_dointvec_jiffies);
3184 EXPORT_SYMBOL(proc_dointvec_minmax);
3185 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
3186 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
3187 EXPORT_SYMBOL(proc_dostring);
3188 EXPORT_SYMBOL(proc_doulongvec_minmax);
3189 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
3190 EXPORT_SYMBOL(register_sysctl_table);
3191 EXPORT_SYMBOL(register_sysctl_paths);
3192 EXPORT_SYMBOL(sysctl_intvec);
3193 EXPORT_SYMBOL(sysctl_jiffies);
3194 EXPORT_SYMBOL(sysctl_ms_jiffies);
3195 EXPORT_SYMBOL(sysctl_string);
3196 EXPORT_SYMBOL(sysctl_data);
3197 EXPORT_SYMBOL(unregister_sysctl_table);
Linux kernel - Deliverables
This page took 0.101093 seconds and 5 git commands to generate.