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kmemcheck: remove useless check
[linux-2.6/linux-2.6-openrd.git] / kernel / sysctl.c
blob62e4ff9968b5fe64a06c9f8735af10d3b6a304b9
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 = KERN_BOOTLOADER_TYPE,
748 .procname = "bootloader_type",
749 .data = &bootloader_type,
750 .maxlen = sizeof (int),
751 .mode = 0444,
752 .proc_handler = &proc_dointvec,
753 },
754 {
755 .ctl_name = CTL_UNNUMBERED,
756 .procname = "bootloader_version",
757 .data = &bootloader_version,
758 .maxlen = sizeof (int),
759 .mode = 0444,
760 .proc_handler = &proc_dointvec,
761 },
762 {
763 .ctl_name = CTL_UNNUMBERED,
764 .procname = "kstack_depth_to_print",
765 .data = &kstack_depth_to_print,
766 .maxlen = sizeof(int),
767 .mode = 0644,
768 .proc_handler = &proc_dointvec,
769 },
770 {
771 .ctl_name = CTL_UNNUMBERED,
772 .procname = "io_delay_type",
773 .data = &io_delay_type,
774 .maxlen = sizeof(int),
775 .mode = 0644,
776 .proc_handler = &proc_dointvec,
777 },
778 #endif
779 #if defined(CONFIG_MMU)
780 {
781 .ctl_name = KERN_RANDOMIZE,
782 .procname = "randomize_va_space",
783 .data = &randomize_va_space,
784 .maxlen = sizeof(int),
785 .mode = 0644,
786 .proc_handler = &proc_dointvec,
787 },
788 #endif
789 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
790 {
791 .ctl_name = KERN_SPIN_RETRY,
792 .procname = "spin_retry",
793 .data = &spin_retry,
794 .maxlen = sizeof (int),
795 .mode = 0644,
796 .proc_handler = &proc_dointvec,
797 },
798 #endif
799 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
800 {
801 .procname = "acpi_video_flags",
802 .data = &acpi_realmode_flags,
803 .maxlen = sizeof (unsigned long),
804 .mode = 0644,
805 .proc_handler = &proc_doulongvec_minmax,
806 },
807 #endif
808 #ifdef CONFIG_IA64
809 {
810 .ctl_name = KERN_IA64_UNALIGNED,
811 .procname = "ignore-unaligned-usertrap",
812 .data = &no_unaligned_warning,
813 .maxlen = sizeof (int),
814 .mode = 0644,
815 .proc_handler = &proc_dointvec,
816 },
817 {
818 .ctl_name = CTL_UNNUMBERED,
819 .procname = "unaligned-dump-stack",
820 .data = &unaligned_dump_stack,
821 .maxlen = sizeof (int),
822 .mode = 0644,
823 .proc_handler = &proc_dointvec,
824 },
825 #endif
826 #ifdef CONFIG_DETECT_SOFTLOCKUP
827 {
828 .ctl_name = CTL_UNNUMBERED,
829 .procname = "softlockup_panic",
830 .data = &softlockup_panic,
831 .maxlen = sizeof(int),
832 .mode = 0644,
833 .proc_handler = &proc_dointvec_minmax,
834 .strategy = &sysctl_intvec,
835 .extra1 = &zero,
836 .extra2 = &one,
837 },
838 {
839 .ctl_name = CTL_UNNUMBERED,
840 .procname = "softlockup_thresh",
841 .data = &softlockup_thresh,
842 .maxlen = sizeof(int),
843 .mode = 0644,
844 .proc_handler = &proc_dosoftlockup_thresh,
845 .strategy = &sysctl_intvec,
846 .extra1 = &neg_one,
847 .extra2 = &sixty,
848 },
849 #endif
850 #ifdef CONFIG_DETECT_HUNG_TASK
851 {
852 .ctl_name = CTL_UNNUMBERED,
853 .procname = "hung_task_panic",
854 .data = &sysctl_hung_task_panic,
855 .maxlen = sizeof(int),
856 .mode = 0644,
857 .proc_handler = &proc_dointvec_minmax,
858 .strategy = &sysctl_intvec,
859 .extra1 = &zero,
860 .extra2 = &one,
861 },
862 {
863 .ctl_name = CTL_UNNUMBERED,
864 .procname = "hung_task_check_count",
865 .data = &sysctl_hung_task_check_count,
866 .maxlen = sizeof(unsigned long),
867 .mode = 0644,
868 .proc_handler = &proc_doulongvec_minmax,
869 .strategy = &sysctl_intvec,
870 },
871 {
872 .ctl_name = CTL_UNNUMBERED,
873 .procname = "hung_task_timeout_secs",
874 .data = &sysctl_hung_task_timeout_secs,
875 .maxlen = sizeof(unsigned long),
876 .mode = 0644,
877 .proc_handler = &proc_dohung_task_timeout_secs,
878 .strategy = &sysctl_intvec,
879 },
880 {
881 .ctl_name = CTL_UNNUMBERED,
882 .procname = "hung_task_warnings",
883 .data = &sysctl_hung_task_warnings,
884 .maxlen = sizeof(unsigned long),
885 .mode = 0644,
886 .proc_handler = &proc_doulongvec_minmax,
887 .strategy = &sysctl_intvec,
888 },
889 #endif
890 #ifdef CONFIG_COMPAT
891 {
892 .ctl_name = KERN_COMPAT_LOG,
893 .procname = "compat-log",
894 .data = &compat_log,
895 .maxlen = sizeof (int),
896 .mode = 0644,
897 .proc_handler = &proc_dointvec,
898 },
899 #endif
900 #ifdef CONFIG_RT_MUTEXES
901 {
902 .ctl_name = KERN_MAX_LOCK_DEPTH,
903 .procname = "max_lock_depth",
904 .data = &max_lock_depth,
905 .maxlen = sizeof(int),
906 .mode = 0644,
907 .proc_handler = &proc_dointvec,
908 },
909 #endif
910 {
911 .ctl_name = CTL_UNNUMBERED,
912 .procname = "poweroff_cmd",
913 .data = &poweroff_cmd,
914 .maxlen = POWEROFF_CMD_PATH_LEN,
915 .mode = 0644,
916 .proc_handler = &proc_dostring,
917 .strategy = &sysctl_string,
918 },
919 #ifdef CONFIG_KEYS
920 {
921 .ctl_name = CTL_UNNUMBERED,
922 .procname = "keys",
923 .mode = 0555,
924 .child = key_sysctls,
925 },
926 #endif
927 #ifdef CONFIG_RCU_TORTURE_TEST
928 {
929 .ctl_name = CTL_UNNUMBERED,
930 .procname = "rcutorture_runnable",
931 .data = &rcutorture_runnable,
932 .maxlen = sizeof(int),
933 .mode = 0644,
934 .proc_handler = &proc_dointvec,
935 },
936 #endif
937 #ifdef CONFIG_SLOW_WORK
938 {
939 .ctl_name = CTL_UNNUMBERED,
940 .procname = "slow-work",
941 .mode = 0555,
942 .child = slow_work_sysctls,
943 },
944 #endif
945 #ifdef CONFIG_PERF_COUNTERS
946 {
947 .ctl_name = CTL_UNNUMBERED,
948 .procname = "perf_counter_paranoid",
949 .data = &sysctl_perf_counter_paranoid,
950 .maxlen = sizeof(sysctl_perf_counter_paranoid),
951 .mode = 0644,
952 .proc_handler = &proc_dointvec,
953 },
954 {
955 .ctl_name = CTL_UNNUMBERED,
956 .procname = "perf_counter_mlock_kb",
957 .data = &sysctl_perf_counter_mlock,
958 .maxlen = sizeof(sysctl_perf_counter_mlock),
959 .mode = 0644,
960 .proc_handler = &proc_dointvec,
961 },
962 {
963 .ctl_name = CTL_UNNUMBERED,
964 .procname = "perf_counter_max_sample_rate",
965 .data = &sysctl_perf_counter_sample_rate,
966 .maxlen = sizeof(sysctl_perf_counter_sample_rate),
967 .mode = 0644,
968 .proc_handler = &proc_dointvec,
969 },
970 #endif
971 #ifdef CONFIG_KMEMCHECK
972 {
973 .ctl_name = CTL_UNNUMBERED,
974 .procname = "kmemcheck",
975 .data = &kmemcheck_enabled,
976 .maxlen = sizeof(int),
977 .mode = 0644,
978 .proc_handler = &proc_dointvec,
979 },
980 #endif
981
982 /*
983 * NOTE: do not add new entries to this table unless you have read
984 * Documentation/sysctl/ctl_unnumbered.txt
985 */
986 { .ctl_name = 0 }
987 };
988
989 static struct ctl_table vm_table[] = {
990 {
991 .ctl_name = VM_OVERCOMMIT_MEMORY,
992 .procname = "overcommit_memory",
993 .data = &sysctl_overcommit_memory,
994 .maxlen = sizeof(sysctl_overcommit_memory),
995 .mode = 0644,
996 .proc_handler = &proc_dointvec,
997 },
998 {
999 .ctl_name = VM_PANIC_ON_OOM,
1000 .procname = "panic_on_oom",
1001 .data = &sysctl_panic_on_oom,
1002 .maxlen = sizeof(sysctl_panic_on_oom),
1003 .mode = 0644,
1004 .proc_handler = &proc_dointvec,
1005 },
1006 {
1007 .ctl_name = CTL_UNNUMBERED,
1008 .procname = "oom_kill_allocating_task",
1009 .data = &sysctl_oom_kill_allocating_task,
1010 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
1011 .mode = 0644,
1012 .proc_handler = &proc_dointvec,
1013 },
1014 {
1015 .ctl_name = CTL_UNNUMBERED,
1016 .procname = "oom_dump_tasks",
1017 .data = &sysctl_oom_dump_tasks,
1018 .maxlen = sizeof(sysctl_oom_dump_tasks),
1019 .mode = 0644,
1020 .proc_handler = &proc_dointvec,
1021 },
1022 {
1023 .ctl_name = VM_OVERCOMMIT_RATIO,
1024 .procname = "overcommit_ratio",
1025 .data = &sysctl_overcommit_ratio,
1026 .maxlen = sizeof(sysctl_overcommit_ratio),
1027 .mode = 0644,
1028 .proc_handler = &proc_dointvec,
1029 },
1030 {
1031 .ctl_name = VM_PAGE_CLUSTER,
1032 .procname = "page-cluster",
1033 .data = &page_cluster,
1034 .maxlen = sizeof(int),
1035 .mode = 0644,
1036 .proc_handler = &proc_dointvec,
1037 },
1038 {
1039 .ctl_name = VM_DIRTY_BACKGROUND,
1040 .procname = "dirty_background_ratio",
1041 .data = &dirty_background_ratio,
1042 .maxlen = sizeof(dirty_background_ratio),
1043 .mode = 0644,
1044 .proc_handler = &dirty_background_ratio_handler,
1045 .strategy = &sysctl_intvec,
1046 .extra1 = &zero,
1047 .extra2 = &one_hundred,
1048 },
1049 {
1050 .ctl_name = CTL_UNNUMBERED,
1051 .procname = "dirty_background_bytes",
1052 .data = &dirty_background_bytes,
1053 .maxlen = sizeof(dirty_background_bytes),
1054 .mode = 0644,
1055 .proc_handler = &dirty_background_bytes_handler,
1056 .strategy = &sysctl_intvec,
1057 .extra1 = &one_ul,
1058 },
1059 {
1060 .ctl_name = VM_DIRTY_RATIO,
1061 .procname = "dirty_ratio",
1062 .data = &vm_dirty_ratio,
1063 .maxlen = sizeof(vm_dirty_ratio),
1064 .mode = 0644,
1065 .proc_handler = &dirty_ratio_handler,
1066 .strategy = &sysctl_intvec,
1067 .extra1 = &zero,
1068 .extra2 = &one_hundred,
1069 },
1070 {
1071 .ctl_name = CTL_UNNUMBERED,
1072 .procname = "dirty_bytes",
1073 .data = &vm_dirty_bytes,
1074 .maxlen = sizeof(vm_dirty_bytes),
1075 .mode = 0644,
1076 .proc_handler = &dirty_bytes_handler,
1077 .strategy = &sysctl_intvec,
1078 .extra1 = &dirty_bytes_min,
1079 },
1080 {
1081 .procname = "dirty_writeback_centisecs",
1082 .data = &dirty_writeback_interval,
1083 .maxlen = sizeof(dirty_writeback_interval),
1084 .mode = 0644,
1085 .proc_handler = &dirty_writeback_centisecs_handler,
1086 },
1087 {
1088 .procname = "dirty_expire_centisecs",
1089 .data = &dirty_expire_interval,
1090 .maxlen = sizeof(dirty_expire_interval),
1091 .mode = 0644,
1092 .proc_handler = &proc_dointvec,
1093 },
1094 {
1095 .ctl_name = VM_NR_PDFLUSH_THREADS,
1096 .procname = "nr_pdflush_threads",
1097 .data = &nr_pdflush_threads,
1098 .maxlen = sizeof nr_pdflush_threads,
1099 .mode = 0444 /* read-only*/,
1100 .proc_handler = &proc_dointvec,
1101 },
1102 {
1103 .ctl_name = VM_SWAPPINESS,
1104 .procname = "swappiness",
1105 .data = &vm_swappiness,
1106 .maxlen = sizeof(vm_swappiness),
1107 .mode = 0644,
1108 .proc_handler = &proc_dointvec_minmax,
1109 .strategy = &sysctl_intvec,
1110 .extra1 = &zero,
1111 .extra2 = &one_hundred,
1112 },
1113 #ifdef CONFIG_HUGETLB_PAGE
1114 {
1115 .procname = "nr_hugepages",
1116 .data = NULL,
1117 .maxlen = sizeof(unsigned long),
1118 .mode = 0644,
1119 .proc_handler = &hugetlb_sysctl_handler,
1120 .extra1 = (void *)&hugetlb_zero,
1121 .extra2 = (void *)&hugetlb_infinity,
1122 },
1123 {
1124 .ctl_name = VM_HUGETLB_GROUP,
1125 .procname = "hugetlb_shm_group",
1126 .data = &sysctl_hugetlb_shm_group,
1127 .maxlen = sizeof(gid_t),
1128 .mode = 0644,
1129 .proc_handler = &proc_dointvec,
1130 },
1131 {
1132 .ctl_name = CTL_UNNUMBERED,
1133 .procname = "hugepages_treat_as_movable",
1134 .data = &hugepages_treat_as_movable,
1135 .maxlen = sizeof(int),
1136 .mode = 0644,
1137 .proc_handler = &hugetlb_treat_movable_handler,
1138 },
1139 {
1140 .ctl_name = CTL_UNNUMBERED,
1141 .procname = "nr_overcommit_hugepages",
1142 .data = NULL,
1143 .maxlen = sizeof(unsigned long),
1144 .mode = 0644,
1145 .proc_handler = &hugetlb_overcommit_handler,
1146 .extra1 = (void *)&hugetlb_zero,
1147 .extra2 = (void *)&hugetlb_infinity,
1148 },
1149 #endif
1150 {
1151 .ctl_name = VM_LOWMEM_RESERVE_RATIO,
1152 .procname = "lowmem_reserve_ratio",
1153 .data = &sysctl_lowmem_reserve_ratio,
1154 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1155 .mode = 0644,
1156 .proc_handler = &lowmem_reserve_ratio_sysctl_handler,
1157 .strategy = &sysctl_intvec,
1158 },
1159 {
1160 .ctl_name = VM_DROP_PAGECACHE,
1161 .procname = "drop_caches",
1162 .data = &sysctl_drop_caches,
1163 .maxlen = sizeof(int),
1164 .mode = 0644,
1165 .proc_handler = drop_caches_sysctl_handler,
1166 .strategy = &sysctl_intvec,
1167 },
1168 {
1169 .ctl_name = VM_MIN_FREE_KBYTES,
1170 .procname = "min_free_kbytes",
1171 .data = &min_free_kbytes,
1172 .maxlen = sizeof(min_free_kbytes),
1173 .mode = 0644,
1174 .proc_handler = &min_free_kbytes_sysctl_handler,
1175 .strategy = &sysctl_intvec,
1176 .extra1 = &zero,
1177 },
1178 {
1179 .ctl_name = VM_PERCPU_PAGELIST_FRACTION,
1180 .procname = "percpu_pagelist_fraction",
1181 .data = &percpu_pagelist_fraction,
1182 .maxlen = sizeof(percpu_pagelist_fraction),
1183 .mode = 0644,
1184 .proc_handler = &percpu_pagelist_fraction_sysctl_handler,
1185 .strategy = &sysctl_intvec,
1186 .extra1 = &min_percpu_pagelist_fract,
1187 },
1188 #ifdef CONFIG_MMU
1189 {
1190 .ctl_name = VM_MAX_MAP_COUNT,
1191 .procname = "max_map_count",
1192 .data = &sysctl_max_map_count,
1193 .maxlen = sizeof(sysctl_max_map_count),
1194 .mode = 0644,
1195 .proc_handler = &proc_dointvec
1196 },
1197 #else
1198 {
1199 .ctl_name = CTL_UNNUMBERED,
1200 .procname = "nr_trim_pages",
1201 .data = &sysctl_nr_trim_pages,
1202 .maxlen = sizeof(sysctl_nr_trim_pages),
1203 .mode = 0644,
1204 .proc_handler = &proc_dointvec_minmax,
1205 .strategy = &sysctl_intvec,
1206 .extra1 = &zero,
1207 },
1208 #endif
1209 {
1210 .ctl_name = VM_LAPTOP_MODE,
1211 .procname = "laptop_mode",
1212 .data = &laptop_mode,
1213 .maxlen = sizeof(laptop_mode),
1214 .mode = 0644,
1215 .proc_handler = &proc_dointvec_jiffies,
1216 .strategy = &sysctl_jiffies,
1217 },
1218 {
1219 .ctl_name = VM_BLOCK_DUMP,
1220 .procname = "block_dump",
1221 .data = &block_dump,
1222 .maxlen = sizeof(block_dump),
1223 .mode = 0644,
1224 .proc_handler = &proc_dointvec,
1225 .strategy = &sysctl_intvec,
1226 .extra1 = &zero,
1227 },
1228 {
1229 .ctl_name = VM_VFS_CACHE_PRESSURE,
1230 .procname = "vfs_cache_pressure",
1231 .data = &sysctl_vfs_cache_pressure,
1232 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1233 .mode = 0644,
1234 .proc_handler = &proc_dointvec,
1235 .strategy = &sysctl_intvec,
1236 .extra1 = &zero,
1237 },
1238 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1239 {
1240 .ctl_name = VM_LEGACY_VA_LAYOUT,
1241 .procname = "legacy_va_layout",
1242 .data = &sysctl_legacy_va_layout,
1243 .maxlen = sizeof(sysctl_legacy_va_layout),
1244 .mode = 0644,
1245 .proc_handler = &proc_dointvec,
1246 .strategy = &sysctl_intvec,
1247 .extra1 = &zero,
1248 },
1249 #endif
1250 #ifdef CONFIG_NUMA
1251 {
1252 .ctl_name = VM_ZONE_RECLAIM_MODE,
1253 .procname = "zone_reclaim_mode",
1254 .data = &zone_reclaim_mode,
1255 .maxlen = sizeof(zone_reclaim_mode),
1256 .mode = 0644,
1257 .proc_handler = &proc_dointvec,
1258 .strategy = &sysctl_intvec,
1259 .extra1 = &zero,
1260 },
1261 {
1262 .ctl_name = VM_MIN_UNMAPPED,
1263 .procname = "min_unmapped_ratio",
1264 .data = &sysctl_min_unmapped_ratio,
1265 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1266 .mode = 0644,
1267 .proc_handler = &sysctl_min_unmapped_ratio_sysctl_handler,
1268 .strategy = &sysctl_intvec,
1269 .extra1 = &zero,
1270 .extra2 = &one_hundred,
1271 },
1272 {
1273 .ctl_name = VM_MIN_SLAB,
1274 .procname = "min_slab_ratio",
1275 .data = &sysctl_min_slab_ratio,
1276 .maxlen = sizeof(sysctl_min_slab_ratio),
1277 .mode = 0644,
1278 .proc_handler = &sysctl_min_slab_ratio_sysctl_handler,
1279 .strategy = &sysctl_intvec,
1280 .extra1 = &zero,
1281 .extra2 = &one_hundred,
1282 },
1283 #endif
1284 #ifdef CONFIG_SMP
1285 {
1286 .ctl_name = CTL_UNNUMBERED,
1287 .procname = "stat_interval",
1288 .data = &sysctl_stat_interval,
1289 .maxlen = sizeof(sysctl_stat_interval),
1290 .mode = 0644,
1291 .proc_handler = &proc_dointvec_jiffies,
1292 .strategy = &sysctl_jiffies,
1293 },
1294 #endif
1295 {
1296 .ctl_name = CTL_UNNUMBERED,
1297 .procname = "mmap_min_addr",
1298 .data = &mmap_min_addr,
1299 .maxlen = sizeof(unsigned long),
1300 .mode = 0644,
1301 .proc_handler = &proc_doulongvec_minmax,
1302 },
1303 #ifdef CONFIG_NUMA
1304 {
1305 .ctl_name = CTL_UNNUMBERED,
1306 .procname = "numa_zonelist_order",
1307 .data = &numa_zonelist_order,
1308 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1309 .mode = 0644,
1310 .proc_handler = &numa_zonelist_order_handler,
1311 .strategy = &sysctl_string,
1312 },
1313 #endif
1314 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1315 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1316 {
1317 .ctl_name = VM_VDSO_ENABLED,
1318 .procname = "vdso_enabled",
1319 .data = &vdso_enabled,
1320 .maxlen = sizeof(vdso_enabled),
1321 .mode = 0644,
1322 .proc_handler = &proc_dointvec,
1323 .strategy = &sysctl_intvec,
1324 .extra1 = &zero,
1325 },
1326 #endif
1327 #ifdef CONFIG_HIGHMEM
1328 {
1329 .ctl_name = CTL_UNNUMBERED,
1330 .procname = "highmem_is_dirtyable",
1331 .data = &vm_highmem_is_dirtyable,
1332 .maxlen = sizeof(vm_highmem_is_dirtyable),
1333 .mode = 0644,
1334 .proc_handler = &proc_dointvec_minmax,
1335 .strategy = &sysctl_intvec,
1336 .extra1 = &zero,
1337 .extra2 = &one,
1338 },
1339 #endif
1340 {
1341 .ctl_name = CTL_UNNUMBERED,
1342 .procname = "scan_unevictable_pages",
1343 .data = &scan_unevictable_pages,
1344 .maxlen = sizeof(scan_unevictable_pages),
1345 .mode = 0644,
1346 .proc_handler = &scan_unevictable_handler,
1347 },
1348 /*
1349 * NOTE: do not add new entries to this table unless you have read
1350 * Documentation/sysctl/ctl_unnumbered.txt
1351 */
1352 { .ctl_name = 0 }
1353 };
1354
1355 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1356 static struct ctl_table binfmt_misc_table[] = {
1357 { .ctl_name = 0 }
1358 };
1359 #endif
1360
1361 static struct ctl_table fs_table[] = {
1362 {
1363 .ctl_name = FS_NRINODE,
1364 .procname = "inode-nr",
1365 .data = &inodes_stat,
1366 .maxlen = 2*sizeof(int),
1367 .mode = 0444,
1368 .proc_handler = &proc_dointvec,
1369 },
1370 {
1371 .ctl_name = FS_STATINODE,
1372 .procname = "inode-state",
1373 .data = &inodes_stat,
1374 .maxlen = 7*sizeof(int),
1375 .mode = 0444,
1376 .proc_handler = &proc_dointvec,
1377 },
1378 {
1379 .procname = "file-nr",
1380 .data = &files_stat,
1381 .maxlen = 3*sizeof(int),
1382 .mode = 0444,
1383 .proc_handler = &proc_nr_files,
1384 },
1385 {
1386 .ctl_name = FS_MAXFILE,
1387 .procname = "file-max",
1388 .data = &files_stat.max_files,
1389 .maxlen = sizeof(int),
1390 .mode = 0644,
1391 .proc_handler = &proc_dointvec,
1392 },
1393 {
1394 .ctl_name = CTL_UNNUMBERED,
1395 .procname = "nr_open",
1396 .data = &sysctl_nr_open,
1397 .maxlen = sizeof(int),
1398 .mode = 0644,
1399 .proc_handler = &proc_dointvec_minmax,
1400 .extra1 = &sysctl_nr_open_min,
1401 .extra2 = &sysctl_nr_open_max,
1402 },
1403 {
1404 .ctl_name = FS_DENTRY,
1405 .procname = "dentry-state",
1406 .data = &dentry_stat,
1407 .maxlen = 6*sizeof(int),
1408 .mode = 0444,
1409 .proc_handler = &proc_dointvec,
1410 },
1411 {
1412 .ctl_name = FS_OVERFLOWUID,
1413 .procname = "overflowuid",
1414 .data = &fs_overflowuid,
1415 .maxlen = sizeof(int),
1416 .mode = 0644,
1417 .proc_handler = &proc_dointvec_minmax,
1418 .strategy = &sysctl_intvec,
1419 .extra1 = &minolduid,
1420 .extra2 = &maxolduid,
1421 },
1422 {
1423 .ctl_name = FS_OVERFLOWGID,
1424 .procname = "overflowgid",
1425 .data = &fs_overflowgid,
1426 .maxlen = sizeof(int),
1427 .mode = 0644,
1428 .proc_handler = &proc_dointvec_minmax,
1429 .strategy = &sysctl_intvec,
1430 .extra1 = &minolduid,
1431 .extra2 = &maxolduid,
1432 },
1433 #ifdef CONFIG_FILE_LOCKING
1434 {
1435 .ctl_name = FS_LEASES,
1436 .procname = "leases-enable",
1437 .data = &leases_enable,
1438 .maxlen = sizeof(int),
1439 .mode = 0644,
1440 .proc_handler = &proc_dointvec,
1441 },
1442 #endif
1443 #ifdef CONFIG_DNOTIFY
1444 {
1445 .ctl_name = FS_DIR_NOTIFY,
1446 .procname = "dir-notify-enable",
1447 .data = &dir_notify_enable,
1448 .maxlen = sizeof(int),
1449 .mode = 0644,
1450 .proc_handler = &proc_dointvec,
1451 },
1452 #endif
1453 #ifdef CONFIG_MMU
1454 #ifdef CONFIG_FILE_LOCKING
1455 {
1456 .ctl_name = FS_LEASE_TIME,
1457 .procname = "lease-break-time",
1458 .data = &lease_break_time,
1459 .maxlen = sizeof(int),
1460 .mode = 0644,
1461 .proc_handler = &proc_dointvec,
1462 },
1463 #endif
1464 #ifdef CONFIG_AIO
1465 {
1466 .procname = "aio-nr",
1467 .data = &aio_nr,
1468 .maxlen = sizeof(aio_nr),
1469 .mode = 0444,
1470 .proc_handler = &proc_doulongvec_minmax,
1471 },
1472 {
1473 .procname = "aio-max-nr",
1474 .data = &aio_max_nr,
1475 .maxlen = sizeof(aio_max_nr),
1476 .mode = 0644,
1477 .proc_handler = &proc_doulongvec_minmax,
1478 },
1479 #endif /* CONFIG_AIO */
1480 #ifdef CONFIG_INOTIFY_USER
1481 {
1482 .ctl_name = FS_INOTIFY,
1483 .procname = "inotify",
1484 .mode = 0555,
1485 .child = inotify_table,
1486 },
1487 #endif
1488 #ifdef CONFIG_EPOLL
1489 {
1490 .procname = "epoll",
1491 .mode = 0555,
1492 .child = epoll_table,
1493 },
1494 #endif
1495 #endif
1496 {
1497 .ctl_name = KERN_SETUID_DUMPABLE,
1498 .procname = "suid_dumpable",
1499 .data = &suid_dumpable,
1500 .maxlen = sizeof(int),
1501 .mode = 0644,
1502 .proc_handler = &proc_dointvec_minmax,
1503 .strategy = &sysctl_intvec,
1504 .extra1 = &zero,
1505 .extra2 = &two,
1506 },
1507 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1508 {
1509 .ctl_name = CTL_UNNUMBERED,
1510 .procname = "binfmt_misc",
1511 .mode = 0555,
1512 .child = binfmt_misc_table,
1513 },
1514 #endif
1515 /*
1516 * NOTE: do not add new entries to this table unless you have read
1517 * Documentation/sysctl/ctl_unnumbered.txt
1518 */
1519 { .ctl_name = 0 }
1520 };
1521
1522 static struct ctl_table debug_table[] = {
1523 #if defined(CONFIG_X86) || defined(CONFIG_PPC)
1524 {
1525 .ctl_name = CTL_UNNUMBERED,
1526 .procname = "exception-trace",
1527 .data = &show_unhandled_signals,
1528 .maxlen = sizeof(int),
1529 .mode = 0644,
1530 .proc_handler = proc_dointvec
1531 },
1532 #endif
1533 { .ctl_name = 0 }
1534 };
1535
1536 static struct ctl_table dev_table[] = {
1537 { .ctl_name = 0 }
1538 };
1539
1540 static DEFINE_SPINLOCK(sysctl_lock);
1541
1542 /* called under sysctl_lock */
1543 static int use_table(struct ctl_table_header *p)
1544 {
1545 if (unlikely(p->unregistering))
1546 return 0;
1547 p->used++;
1548 return 1;
1549 }
1550
1551 /* called under sysctl_lock */
1552 static void unuse_table(struct ctl_table_header *p)
1553 {
1554 if (!--p->used)
1555 if (unlikely(p->unregistering))
1556 complete(p->unregistering);
1557 }
1558
1559 /* called under sysctl_lock, will reacquire if has to wait */
1560 static void start_unregistering(struct ctl_table_header *p)
1561 {
1562 /*
1563 * if p->used is 0, nobody will ever touch that entry again;
1564 * we'll eliminate all paths to it before dropping sysctl_lock
1565 */
1566 if (unlikely(p->used)) {
1567 struct completion wait;
1568 init_completion(&wait);
1569 p->unregistering = &wait;
1570 spin_unlock(&sysctl_lock);
1571 wait_for_completion(&wait);
1572 spin_lock(&sysctl_lock);
1573 } else {
1574 /* anything non-NULL; we'll never dereference it */
1575 p->unregistering = ERR_PTR(-EINVAL);
1576 }
1577 /*
1578 * do not remove from the list until nobody holds it; walking the
1579 * list in do_sysctl() relies on that.
1580 */
1581 list_del_init(&p->ctl_entry);
1582 }
1583
1584 void sysctl_head_get(struct ctl_table_header *head)
1585 {
1586 spin_lock(&sysctl_lock);
1587 head->count++;
1588 spin_unlock(&sysctl_lock);
1589 }
1590
1591 void sysctl_head_put(struct ctl_table_header *head)
1592 {
1593 spin_lock(&sysctl_lock);
1594 if (!--head->count)
1595 kfree(head);
1596 spin_unlock(&sysctl_lock);
1597 }
1598
1599 struct ctl_table_header *sysctl_head_grab(struct ctl_table_header *head)
1600 {
1601 if (!head)
1602 BUG();
1603 spin_lock(&sysctl_lock);
1604 if (!use_table(head))
1605 head = ERR_PTR(-ENOENT);
1606 spin_unlock(&sysctl_lock);
1607 return head;
1608 }
1609
1610 void sysctl_head_finish(struct ctl_table_header *head)
1611 {
1612 if (!head)
1613 return;
1614 spin_lock(&sysctl_lock);
1615 unuse_table(head);
1616 spin_unlock(&sysctl_lock);
1617 }
1618
1619 static struct ctl_table_set *
1620 lookup_header_set(struct ctl_table_root *root, struct nsproxy *namespaces)
1621 {
1622 struct ctl_table_set *set = &root->default_set;
1623 if (root->lookup)
1624 set = root->lookup(root, namespaces);
1625 return set;
1626 }
1627
1628 static struct list_head *
1629 lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces)
1630 {
1631 struct ctl_table_set *set = lookup_header_set(root, namespaces);
1632 return &set->list;
1633 }
1634
1635 struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces,
1636 struct ctl_table_header *prev)
1637 {
1638 struct ctl_table_root *root;
1639 struct list_head *header_list;
1640 struct ctl_table_header *head;
1641 struct list_head *tmp;
1642
1643 spin_lock(&sysctl_lock);
1644 if (prev) {
1645 head = prev;
1646 tmp = &prev->ctl_entry;
1647 unuse_table(prev);
1648 goto next;
1649 }
1650 tmp = &root_table_header.ctl_entry;
1651 for (;;) {
1652 head = list_entry(tmp, struct ctl_table_header, ctl_entry);
1653
1654 if (!use_table(head))
1655 goto next;
1656 spin_unlock(&sysctl_lock);
1657 return head;
1658 next:
1659 root = head->root;
1660 tmp = tmp->next;
1661 header_list = lookup_header_list(root, namespaces);
1662 if (tmp != header_list)
1663 continue;
1664
1665 do {
1666 root = list_entry(root->root_list.next,
1667 struct ctl_table_root, root_list);
1668 if (root == &sysctl_table_root)
1669 goto out;
1670 header_list = lookup_header_list(root, namespaces);
1671 } while (list_empty(header_list));
1672 tmp = header_list->next;
1673 }
1674 out:
1675 spin_unlock(&sysctl_lock);
1676 return NULL;
1677 }
1678
1679 struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev)
1680 {
1681 return __sysctl_head_next(current->nsproxy, prev);
1682 }
1683
1684 void register_sysctl_root(struct ctl_table_root *root)
1685 {
1686 spin_lock(&sysctl_lock);
1687 list_add_tail(&root->root_list, &sysctl_table_root.root_list);
1688 spin_unlock(&sysctl_lock);
1689 }
1690
1691 #ifdef CONFIG_SYSCTL_SYSCALL
1692 /* Perform the actual read/write of a sysctl table entry. */
1693 static int do_sysctl_strategy(struct ctl_table_root *root,
1694 struct ctl_table *table,
1695 void __user *oldval, size_t __user *oldlenp,
1696 void __user *newval, size_t newlen)
1697 {
1698 int op = 0, rc;
1699
1700 if (oldval)
1701 op |= MAY_READ;
1702 if (newval)
1703 op |= MAY_WRITE;
1704 if (sysctl_perm(root, table, op))
1705 return -EPERM;
1706
1707 if (table->strategy) {
1708 rc = table->strategy(table, oldval, oldlenp, newval, newlen);
1709 if (rc < 0)
1710 return rc;
1711 if (rc > 0)
1712 return 0;
1713 }
1714
1715 /* If there is no strategy routine, or if the strategy returns
1716 * zero, proceed with automatic r/w */
1717 if (table->data && table->maxlen) {
1718 rc = sysctl_data(table, oldval, oldlenp, newval, newlen);
1719 if (rc < 0)
1720 return rc;
1721 }
1722 return 0;
1723 }
1724
1725 static int parse_table(int __user *name, int nlen,
1726 void __user *oldval, size_t __user *oldlenp,
1727 void __user *newval, size_t newlen,
1728 struct ctl_table_root *root,
1729 struct ctl_table *table)
1730 {
1731 int n;
1732 repeat:
1733 if (!nlen)
1734 return -ENOTDIR;
1735 if (get_user(n, name))
1736 return -EFAULT;
1737 for ( ; table->ctl_name || table->procname; table++) {
1738 if (!table->ctl_name)
1739 continue;
1740 if (n == table->ctl_name) {
1741 int error;
1742 if (table->child) {
1743 if (sysctl_perm(root, table, MAY_EXEC))
1744 return -EPERM;
1745 name++;
1746 nlen--;
1747 table = table->child;
1748 goto repeat;
1749 }
1750 error = do_sysctl_strategy(root, table,
1751 oldval, oldlenp,
1752 newval, newlen);
1753 return error;
1754 }
1755 }
1756 return -ENOTDIR;
1757 }
1758
1759 int do_sysctl(int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp,
1760 void __user *newval, size_t newlen)
1761 {
1762 struct ctl_table_header *head;
1763 int error = -ENOTDIR;
1764
1765 if (nlen <= 0 || nlen >= CTL_MAXNAME)
1766 return -ENOTDIR;
1767 if (oldval) {
1768 int old_len;
1769 if (!oldlenp || get_user(old_len, oldlenp))
1770 return -EFAULT;
1771 }
1772
1773 for (head = sysctl_head_next(NULL); head;
1774 head = sysctl_head_next(head)) {
1775 error = parse_table(name, nlen, oldval, oldlenp,
1776 newval, newlen,
1777 head->root, head->ctl_table);
1778 if (error != -ENOTDIR) {
1779 sysctl_head_finish(head);
1780 break;
1781 }
1782 }
1783 return error;
1784 }
1785
1786 SYSCALL_DEFINE1(sysctl, struct __sysctl_args __user *, args)
1787 {
1788 struct __sysctl_args tmp;
1789 int error;
1790
1791 if (copy_from_user(&tmp, args, sizeof(tmp)))
1792 return -EFAULT;
1793
1794 error = deprecated_sysctl_warning(&tmp);
1795 if (error)
1796 goto out;
1797
1798 lock_kernel();
1799 error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp,
1800 tmp.newval, tmp.newlen);
1801 unlock_kernel();
1802 out:
1803 return error;
1804 }
1805 #endif /* CONFIG_SYSCTL_SYSCALL */
1806
1807 /*
1808 * sysctl_perm does NOT grant the superuser all rights automatically, because
1809 * some sysctl variables are readonly even to root.
1810 */
1811
1812 static int test_perm(int mode, int op)
1813 {
1814 if (!current_euid())
1815 mode >>= 6;
1816 else if (in_egroup_p(0))
1817 mode >>= 3;
1818 if ((op & ~mode & (MAY_READ|MAY_WRITE|MAY_EXEC)) == 0)
1819 return 0;
1820 return -EACCES;
1821 }
1822
1823 int sysctl_perm(struct ctl_table_root *root, struct ctl_table *table, int op)
1824 {
1825 int error;
1826 int mode;
1827
1828 error = security_sysctl(table, op & (MAY_READ | MAY_WRITE | MAY_EXEC));
1829 if (error)
1830 return error;
1831
1832 if (root->permissions)
1833 mode = root->permissions(root, current->nsproxy, table);
1834 else
1835 mode = table->mode;
1836
1837 return test_perm(mode, op);
1838 }
1839
1840 static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table)
1841 {
1842 for (; table->ctl_name || table->procname; table++) {
1843 table->parent = parent;
1844 if (table->child)
1845 sysctl_set_parent(table, table->child);
1846 }
1847 }
1848
1849 static __init int sysctl_init(void)
1850 {
1851 sysctl_set_parent(NULL, root_table);
1852 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK
1853 {
1854 int err;
1855 err = sysctl_check_table(current->nsproxy, root_table);
1856 }
1857 #endif
1858 return 0;
1859 }
1860
1861 core_initcall(sysctl_init);
1862
1863 static struct ctl_table *is_branch_in(struct ctl_table *branch,
1864 struct ctl_table *table)
1865 {
1866 struct ctl_table *p;
1867 const char *s = branch->procname;
1868
1869 /* branch should have named subdirectory as its first element */
1870 if (!s || !branch->child)
1871 return NULL;
1872
1873 /* ... and nothing else */
1874 if (branch[1].procname || branch[1].ctl_name)
1875 return NULL;
1876
1877 /* table should contain subdirectory with the same name */
1878 for (p = table; p->procname || p->ctl_name; p++) {
1879 if (!p->child)
1880 continue;
1881 if (p->procname && strcmp(p->procname, s) == 0)
1882 return p;
1883 }
1884 return NULL;
1885 }
1886
1887 /* see if attaching q to p would be an improvement */
1888 static void try_attach(struct ctl_table_header *p, struct ctl_table_header *q)
1889 {
1890 struct ctl_table *to = p->ctl_table, *by = q->ctl_table;
1891 struct ctl_table *next;
1892 int is_better = 0;
1893 int not_in_parent = !p->attached_by;
1894
1895 while ((next = is_branch_in(by, to)) != NULL) {
1896 if (by == q->attached_by)
1897 is_better = 1;
1898 if (to == p->attached_by)
1899 not_in_parent = 1;
1900 by = by->child;
1901 to = next->child;
1902 }
1903
1904 if (is_better && not_in_parent) {
1905 q->attached_by = by;
1906 q->attached_to = to;
1907 q->parent = p;
1908 }
1909 }
1910
1911 /**
1912 * __register_sysctl_paths - register a sysctl hierarchy
1913 * @root: List of sysctl headers to register on
1914 * @namespaces: Data to compute which lists of sysctl entries are visible
1915 * @path: The path to the directory the sysctl table is in.
1916 * @table: the top-level table structure
1917 *
1918 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1919 * array. A completely 0 filled entry terminates the table.
1920 *
1921 * The members of the &struct ctl_table structure are used as follows:
1922 *
1923 * ctl_name - This is the numeric sysctl value used by sysctl(2). The number
1924 * must be unique within that level of sysctl
1925 *
1926 * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1927 * enter a sysctl file
1928 *
1929 * data - a pointer to data for use by proc_handler
1930 *
1931 * maxlen - the maximum size in bytes of the data
1932 *
1933 * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1934 *
1935 * child - a pointer to the child sysctl table if this entry is a directory, or
1936 * %NULL.
1937 *
1938 * proc_handler - the text handler routine (described below)
1939 *
1940 * strategy - the strategy routine (described below)
1941 *
1942 * de - for internal use by the sysctl routines
1943 *
1944 * extra1, extra2 - extra pointers usable by the proc handler routines
1945 *
1946 * Leaf nodes in the sysctl tree will be represented by a single file
1947 * under /proc; non-leaf nodes will be represented by directories.
1948 *
1949 * sysctl(2) can automatically manage read and write requests through
1950 * the sysctl table. The data and maxlen fields of the ctl_table
1951 * struct enable minimal validation of the values being written to be
1952 * performed, and the mode field allows minimal authentication.
1953 *
1954 * More sophisticated management can be enabled by the provision of a
1955 * strategy routine with the table entry. This will be called before
1956 * any automatic read or write of the data is performed.
1957 *
1958 * The strategy routine may return
1959 *
1960 * < 0 - Error occurred (error is passed to user process)
1961 *
1962 * 0 - OK - proceed with automatic read or write.
1963 *
1964 * > 0 - OK - read or write has been done by the strategy routine, so
1965 * return immediately.
1966 *
1967 * There must be a proc_handler routine for any terminal nodes
1968 * mirrored under /proc/sys (non-terminals are handled by a built-in
1969 * directory handler). Several default handlers are available to
1970 * cover common cases -
1971 *
1972 * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
1973 * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(),
1974 * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
1975 *
1976 * It is the handler's job to read the input buffer from user memory
1977 * and process it. The handler should return 0 on success.
1978 *
1979 * This routine returns %NULL on a failure to register, and a pointer
1980 * to the table header on success.
1981 */
1982 struct ctl_table_header *__register_sysctl_paths(
1983 struct ctl_table_root *root,
1984 struct nsproxy *namespaces,
1985 const struct ctl_path *path, struct ctl_table *table)
1986 {
1987 struct ctl_table_header *header;
1988 struct ctl_table *new, **prevp;
1989 unsigned int n, npath;
1990 struct ctl_table_set *set;
1991
1992 /* Count the path components */
1993 for (npath = 0; path[npath].ctl_name || path[npath].procname; ++npath)
1994 ;
1995
1996 /*
1997 * For each path component, allocate a 2-element ctl_table array.
1998 * The first array element will be filled with the sysctl entry
1999 * for this, the second will be the sentinel (ctl_name == 0).
2000 *
2001 * We allocate everything in one go so that we don't have to
2002 * worry about freeing additional memory in unregister_sysctl_table.
2003 */
2004 header = kzalloc(sizeof(struct ctl_table_header) +
2005 (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL);
2006 if (!header)
2007 return NULL;
2008
2009 new = (struct ctl_table *) (header + 1);
2010
2011 /* Now connect the dots */
2012 prevp = &header->ctl_table;
2013 for (n = 0; n < npath; ++n, ++path) {
2014 /* Copy the procname */
2015 new->procname = path->procname;
2016 new->ctl_name = path->ctl_name;
2017 new->mode = 0555;
2018
2019 *prevp = new;
2020 prevp = &new->child;
2021
2022 new += 2;
2023 }
2024 *prevp = table;
2025 header->ctl_table_arg = table;
2026
2027 INIT_LIST_HEAD(&header->ctl_entry);
2028 header->used = 0;
2029 header->unregistering = NULL;
2030 header->root = root;
2031 sysctl_set_parent(NULL, header->ctl_table);
2032 header->count = 1;
2033 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK
2034 if (sysctl_check_table(namespaces, header->ctl_table)) {
2035 kfree(header);
2036 return NULL;
2037 }
2038 #endif
2039 spin_lock(&sysctl_lock);
2040 header->set = lookup_header_set(root, namespaces);
2041 header->attached_by = header->ctl_table;
2042 header->attached_to = root_table;
2043 header->parent = &root_table_header;
2044 for (set = header->set; set; set = set->parent) {
2045 struct ctl_table_header *p;
2046 list_for_each_entry(p, &set->list, ctl_entry) {
2047 if (p->unregistering)
2048 continue;
2049 try_attach(p, header);
2050 }
2051 }
2052 header->parent->count++;
2053 list_add_tail(&header->ctl_entry, &header->set->list);
2054 spin_unlock(&sysctl_lock);
2055
2056 return header;
2057 }
2058
2059 /**
2060 * register_sysctl_table_path - register a sysctl table hierarchy
2061 * @path: The path to the directory the sysctl table is in.
2062 * @table: the top-level table structure
2063 *
2064 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
2065 * array. A completely 0 filled entry terminates the table.
2066 *
2067 * See __register_sysctl_paths for more details.
2068 */
2069 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
2070 struct ctl_table *table)
2071 {
2072 return __register_sysctl_paths(&sysctl_table_root, current->nsproxy,
2073 path, table);
2074 }
2075
2076 /**
2077 * register_sysctl_table - register a sysctl table hierarchy
2078 * @table: the top-level table structure
2079 *
2080 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
2081 * array. A completely 0 filled entry terminates the table.
2082 *
2083 * See register_sysctl_paths for more details.
2084 */
2085 struct ctl_table_header *register_sysctl_table(struct ctl_table *table)
2086 {
2087 static const struct ctl_path null_path[] = { {} };
2088
2089 return register_sysctl_paths(null_path, table);
2090 }
2091
2092 /**
2093 * unregister_sysctl_table - unregister a sysctl table hierarchy
2094 * @header: the header returned from register_sysctl_table
2095 *
2096 * Unregisters the sysctl table and all children. proc entries may not
2097 * actually be removed until they are no longer used by anyone.
2098 */
2099 void unregister_sysctl_table(struct ctl_table_header * header)
2100 {
2101 might_sleep();
2102
2103 if (header == NULL)
2104 return;
2105
2106 spin_lock(&sysctl_lock);
2107 start_unregistering(header);
2108 if (!--header->parent->count) {
2109 WARN_ON(1);
2110 kfree(header->parent);
2111 }
2112 if (!--header->count)
2113 kfree(header);
2114 spin_unlock(&sysctl_lock);
2115 }
2116
2117 int sysctl_is_seen(struct ctl_table_header *p)
2118 {
2119 struct ctl_table_set *set = p->set;
2120 int res;
2121 spin_lock(&sysctl_lock);
2122 if (p->unregistering)
2123 res = 0;
2124 else if (!set->is_seen)
2125 res = 1;
2126 else
2127 res = set->is_seen(set);
2128 spin_unlock(&sysctl_lock);
2129 return res;
2130 }
2131
2132 void setup_sysctl_set(struct ctl_table_set *p,
2133 struct ctl_table_set *parent,
2134 int (*is_seen)(struct ctl_table_set *))
2135 {
2136 INIT_LIST_HEAD(&p->list);
2137 p->parent = parent ? parent : &sysctl_table_root.default_set;
2138 p->is_seen = is_seen;
2139 }
2140
2141 #else /* !CONFIG_SYSCTL */
2142 struct ctl_table_header *register_sysctl_table(struct ctl_table * table)
2143 {
2144 return NULL;
2145 }
2146
2147 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
2148 struct ctl_table *table)
2149 {
2150 return NULL;
2151 }
2152
2153 void unregister_sysctl_table(struct ctl_table_header * table)
2154 {
2155 }
2156
2157 void setup_sysctl_set(struct ctl_table_set *p,
2158 struct ctl_table_set *parent,
2159 int (*is_seen)(struct ctl_table_set *))
2160 {
2161 }
2162
2163 void sysctl_head_put(struct ctl_table_header *head)
2164 {
2165 }
2166
2167 #endif /* CONFIG_SYSCTL */
2168
2169 /*
2170 * /proc/sys support
2171 */
2172
2173 #ifdef CONFIG_PROC_SYSCTL
2174
2175 static int _proc_do_string(void* data, int maxlen, int write,
2176 struct file *filp, void __user *buffer,
2177 size_t *lenp, loff_t *ppos)
2178 {
2179 size_t len;
2180 char __user *p;
2181 char c;
2182
2183 if (!data || !maxlen || !*lenp) {
2184 *lenp = 0;
2185 return 0;
2186 }
2187
2188 if (write) {
2189 len = 0;
2190 p = buffer;
2191 while (len < *lenp) {
2192 if (get_user(c, p++))
2193 return -EFAULT;
2194 if (c == 0 || c == '\n')
2195 break;
2196 len++;
2197 }
2198 if (len >= maxlen)
2199 len = maxlen-1;
2200 if(copy_from_user(data, buffer, len))
2201 return -EFAULT;
2202 ((char *) data)[len] = 0;
2203 *ppos += *lenp;
2204 } else {
2205 len = strlen(data);
2206 if (len > maxlen)
2207 len = maxlen;
2208
2209 if (*ppos > len) {
2210 *lenp = 0;
2211 return 0;
2212 }
2213
2214 data += *ppos;
2215 len -= *ppos;
2216
2217 if (len > *lenp)
2218 len = *lenp;
2219 if (len)
2220 if(copy_to_user(buffer, data, len))
2221 return -EFAULT;
2222 if (len < *lenp) {
2223 if(put_user('\n', ((char __user *) buffer) + len))
2224 return -EFAULT;
2225 len++;
2226 }
2227 *lenp = len;
2228 *ppos += len;
2229 }
2230 return 0;
2231 }
2232
2233 /**
2234 * proc_dostring - read a string sysctl
2235 * @table: the sysctl table
2236 * @write: %TRUE if this is a write to the sysctl file
2237 * @filp: the file structure
2238 * @buffer: the user buffer
2239 * @lenp: the size of the user buffer
2240 * @ppos: file position
2241 *
2242 * Reads/writes a string from/to the user buffer. If the kernel
2243 * buffer provided is not large enough to hold the string, the
2244 * string is truncated. The copied string is %NULL-terminated.
2245 * If the string is being read by the user process, it is copied
2246 * and a newline '\n' is added. It is truncated if the buffer is
2247 * not large enough.
2248 *
2249 * Returns 0 on success.
2250 */
2251 int proc_dostring(struct ctl_table *table, int write, struct file *filp,
2252 void __user *buffer, size_t *lenp, loff_t *ppos)
2253 {
2254 return _proc_do_string(table->data, table->maxlen, write, filp,
2255 buffer, lenp, ppos);
2256 }
2257
2258
2259 static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp,
2260 int *valp,
2261 int write, void *data)
2262 {
2263 if (write) {
2264 *valp = *negp ? -*lvalp : *lvalp;
2265 } else {
2266 int val = *valp;
2267 if (val < 0) {
2268 *negp = -1;
2269 *lvalp = (unsigned long)-val;
2270 } else {
2271 *negp = 0;
2272 *lvalp = (unsigned long)val;
2273 }
2274 }
2275 return 0;
2276 }
2277
2278 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
2279 int write, struct file *filp, void __user *buffer,
2280 size_t *lenp, loff_t *ppos,
2281 int (*conv)(int *negp, unsigned long *lvalp, int *valp,
2282 int write, void *data),
2283 void *data)
2284 {
2285 #define TMPBUFLEN 21
2286 int *i, vleft, first = 1, neg;
2287 unsigned long lval;
2288 size_t left, len;
2289
2290 char buf[TMPBUFLEN], *p;
2291 char __user *s = buffer;
2292
2293 if (!tbl_data || !table->maxlen || !*lenp ||
2294 (*ppos && !write)) {
2295 *lenp = 0;
2296 return 0;
2297 }
2298
2299 i = (int *) tbl_data;
2300 vleft = table->maxlen / sizeof(*i);
2301 left = *lenp;
2302
2303 if (!conv)
2304 conv = do_proc_dointvec_conv;
2305
2306 for (; left && vleft--; i++, first=0) {
2307 if (write) {
2308 while (left) {
2309 char c;
2310 if (get_user(c, s))
2311 return -EFAULT;
2312 if (!isspace(c))
2313 break;
2314 left--;
2315 s++;
2316 }
2317 if (!left)
2318 break;
2319 neg = 0;
2320 len = left;
2321 if (len > sizeof(buf) - 1)
2322 len = sizeof(buf) - 1;
2323 if (copy_from_user(buf, s, len))
2324 return -EFAULT;
2325 buf[len] = 0;
2326 p = buf;
2327 if (*p == '-' && left > 1) {
2328 neg = 1;
2329 p++;
2330 }
2331 if (*p < '0' || *p > '9')
2332 break;
2333
2334 lval = simple_strtoul(p, &p, 0);
2335
2336 len = p-buf;
2337 if ((len < left) && *p && !isspace(*p))
2338 break;
2339 s += len;
2340 left -= len;
2341
2342 if (conv(&neg, &lval, i, 1, data))
2343 break;
2344 } else {
2345 p = buf;
2346 if (!first)
2347 *p++ = '\t';
2348
2349 if (conv(&neg, &lval, i, 0, data))
2350 break;
2351
2352 sprintf(p, "%s%lu", neg ? "-" : "", lval);
2353 len = strlen(buf);
2354 if (len > left)
2355 len = left;
2356 if(copy_to_user(s, buf, len))
2357 return -EFAULT;
2358 left -= len;
2359 s += len;
2360 }
2361 }
2362
2363 if (!write && !first && left) {
2364 if(put_user('\n', s))
2365 return -EFAULT;
2366 left--, s++;
2367 }
2368 if (write) {
2369 while (left) {
2370 char c;
2371 if (get_user(c, s++))
2372 return -EFAULT;
2373 if (!isspace(c))
2374 break;
2375 left--;
2376 }
2377 }
2378 if (write && first)
2379 return -EINVAL;
2380 *lenp -= left;
2381 *ppos += *lenp;
2382 return 0;
2383 #undef TMPBUFLEN
2384 }
2385
2386 static int do_proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2387 void __user *buffer, size_t *lenp, loff_t *ppos,
2388 int (*conv)(int *negp, unsigned long *lvalp, int *valp,
2389 int write, void *data),
2390 void *data)
2391 {
2392 return __do_proc_dointvec(table->data, table, write, filp,
2393 buffer, lenp, ppos, conv, data);
2394 }
2395
2396 /**
2397 * proc_dointvec - read a vector of integers
2398 * @table: the sysctl table
2399 * @write: %TRUE if this is a write to the sysctl file
2400 * @filp: the file structure
2401 * @buffer: the user buffer
2402 * @lenp: the size of the user buffer
2403 * @ppos: file position
2404 *
2405 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2406 * values from/to the user buffer, treated as an ASCII string.
2407 *
2408 * Returns 0 on success.
2409 */
2410 int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2411 void __user *buffer, size_t *lenp, loff_t *ppos)
2412 {
2413 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2414 NULL,NULL);
2415 }
2416
2417 /*
2418 * Taint values can only be increased
2419 * This means we can safely use a temporary.
2420 */
2421 static int proc_taint(struct ctl_table *table, int write, struct file *filp,
2422 void __user *buffer, size_t *lenp, loff_t *ppos)
2423 {
2424 struct ctl_table t;
2425 unsigned long tmptaint = get_taint();
2426 int err;
2427
2428 if (write && !capable(CAP_SYS_ADMIN))
2429 return -EPERM;
2430
2431 t = *table;
2432 t.data = &tmptaint;
2433 err = proc_doulongvec_minmax(&t, write, filp, buffer, lenp, ppos);
2434 if (err < 0)
2435 return err;
2436
2437 if (write) {
2438 /*
2439 * Poor man's atomic or. Not worth adding a primitive
2440 * to everyone's atomic.h for this
2441 */
2442 int i;
2443 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2444 if ((tmptaint >> i) & 1)
2445 add_taint(i);
2446 }
2447 }
2448
2449 return err;
2450 }
2451
2452 struct do_proc_dointvec_minmax_conv_param {
2453 int *min;
2454 int *max;
2455 };
2456
2457 static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp,
2458 int *valp,
2459 int write, void *data)
2460 {
2461 struct do_proc_dointvec_minmax_conv_param *param = data;
2462 if (write) {
2463 int val = *negp ? -*lvalp : *lvalp;
2464 if ((param->min && *param->min > val) ||
2465 (param->max && *param->max < val))
2466 return -EINVAL;
2467 *valp = val;
2468 } else {
2469 int val = *valp;
2470 if (val < 0) {
2471 *negp = -1;
2472 *lvalp = (unsigned long)-val;
2473 } else {
2474 *negp = 0;
2475 *lvalp = (unsigned long)val;
2476 }
2477 }
2478 return 0;
2479 }
2480
2481 /**
2482 * proc_dointvec_minmax - read a vector of integers with min/max values
2483 * @table: the sysctl table
2484 * @write: %TRUE if this is a write to the sysctl file
2485 * @filp: the file structure
2486 * @buffer: the user buffer
2487 * @lenp: the size of the user buffer
2488 * @ppos: file position
2489 *
2490 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2491 * values from/to the user buffer, treated as an ASCII string.
2492 *
2493 * This routine will ensure the values are within the range specified by
2494 * table->extra1 (min) and table->extra2 (max).
2495 *
2496 * Returns 0 on success.
2497 */
2498 int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
2499 void __user *buffer, size_t *lenp, loff_t *ppos)
2500 {
2501 struct do_proc_dointvec_minmax_conv_param param = {
2502 .min = (int *) table->extra1,
2503 .max = (int *) table->extra2,
2504 };
2505 return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2506 do_proc_dointvec_minmax_conv, &param);
2507 }
2508
2509 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2510 struct file *filp,
2511 void __user *buffer,
2512 size_t *lenp, loff_t *ppos,
2513 unsigned long convmul,
2514 unsigned long convdiv)
2515 {
2516 #define TMPBUFLEN 21
2517 unsigned long *i, *min, *max, val;
2518 int vleft, first=1, neg;
2519 size_t len, left;
2520 char buf[TMPBUFLEN], *p;
2521 char __user *s = buffer;
2522
2523 if (!data || !table->maxlen || !*lenp ||
2524 (*ppos && !write)) {
2525 *lenp = 0;
2526 return 0;
2527 }
2528
2529 i = (unsigned long *) data;
2530 min = (unsigned long *) table->extra1;
2531 max = (unsigned long *) table->extra2;
2532 vleft = table->maxlen / sizeof(unsigned long);
2533 left = *lenp;
2534
2535 for (; left && vleft--; i++, min++, max++, first=0) {
2536 if (write) {
2537 while (left) {
2538 char c;
2539 if (get_user(c, s))
2540 return -EFAULT;
2541 if (!isspace(c))
2542 break;
2543 left--;
2544 s++;
2545 }
2546 if (!left)
2547 break;
2548 neg = 0;
2549 len = left;
2550 if (len > TMPBUFLEN-1)
2551 len = TMPBUFLEN-1;
2552 if (copy_from_user(buf, s, len))
2553 return -EFAULT;
2554 buf[len] = 0;
2555 p = buf;
2556 if (*p == '-' && left > 1) {
2557 neg = 1;
2558 p++;
2559 }
2560 if (*p < '0' || *p > '9')
2561 break;
2562 val = simple_strtoul(p, &p, 0) * convmul / convdiv ;
2563 len = p-buf;
2564 if ((len < left) && *p && !isspace(*p))
2565 break;
2566 if (neg)
2567 val = -val;
2568 s += len;
2569 left -= len;
2570
2571 if(neg)
2572 continue;
2573 if ((min && val < *min) || (max && val > *max))
2574 continue;
2575 *i = val;
2576 } else {
2577 p = buf;
2578 if (!first)
2579 *p++ = '\t';
2580 sprintf(p, "%lu", convdiv * (*i) / convmul);
2581 len = strlen(buf);
2582 if (len > left)
2583 len = left;
2584 if(copy_to_user(s, buf, len))
2585 return -EFAULT;
2586 left -= len;
2587 s += len;
2588 }
2589 }
2590
2591 if (!write && !first && left) {
2592 if(put_user('\n', s))
2593 return -EFAULT;
2594 left--, s++;
2595 }
2596 if (write) {
2597 while (left) {
2598 char c;
2599 if (get_user(c, s++))
2600 return -EFAULT;
2601 if (!isspace(c))
2602 break;
2603 left--;
2604 }
2605 }
2606 if (write && first)
2607 return -EINVAL;
2608 *lenp -= left;
2609 *ppos += *lenp;
2610 return 0;
2611 #undef TMPBUFLEN
2612 }
2613
2614 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2615 struct file *filp,
2616 void __user *buffer,
2617 size_t *lenp, loff_t *ppos,
2618 unsigned long convmul,
2619 unsigned long convdiv)
2620 {
2621 return __do_proc_doulongvec_minmax(table->data, table, write,
2622 filp, buffer, lenp, ppos, convmul, convdiv);
2623 }
2624
2625 /**
2626 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2627 * @table: the sysctl table
2628 * @write: %TRUE if this is a write to the sysctl file
2629 * @filp: the file structure
2630 * @buffer: the user buffer
2631 * @lenp: the size of the user buffer
2632 * @ppos: file position
2633 *
2634 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2635 * values from/to the user buffer, treated as an ASCII string.
2636 *
2637 * This routine will ensure the values are within the range specified by
2638 * table->extra1 (min) and table->extra2 (max).
2639 *
2640 * Returns 0 on success.
2641 */
2642 int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
2643 void __user *buffer, size_t *lenp, loff_t *ppos)
2644 {
2645 return do_proc_doulongvec_minmax(table, write, filp, buffer, lenp, ppos, 1l, 1l);
2646 }
2647
2648 /**
2649 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2650 * @table: the sysctl table
2651 * @write: %TRUE if this is a write to the sysctl file
2652 * @filp: the file structure
2653 * @buffer: the user buffer
2654 * @lenp: the size of the user buffer
2655 * @ppos: file position
2656 *
2657 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2658 * values from/to the user buffer, treated as an ASCII string. The values
2659 * are treated as milliseconds, and converted to jiffies when they are stored.
2660 *
2661 * This routine will ensure the values are within the range specified by
2662 * table->extra1 (min) and table->extra2 (max).
2663 *
2664 * Returns 0 on success.
2665 */
2666 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2667 struct file *filp,
2668 void __user *buffer,
2669 size_t *lenp, loff_t *ppos)
2670 {
2671 return do_proc_doulongvec_minmax(table, write, filp, buffer,
2672 lenp, ppos, HZ, 1000l);
2673 }
2674
2675
2676 static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp,
2677 int *valp,
2678 int write, void *data)
2679 {
2680 if (write) {
2681 if (*lvalp > LONG_MAX / HZ)
2682 return 1;
2683 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2684 } else {
2685 int val = *valp;
2686 unsigned long lval;
2687 if (val < 0) {
2688 *negp = -1;
2689 lval = (unsigned long)-val;
2690 } else {
2691 *negp = 0;
2692 lval = (unsigned long)val;
2693 }
2694 *lvalp = lval / HZ;
2695 }
2696 return 0;
2697 }
2698
2699 static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp,
2700 int *valp,
2701 int write, void *data)
2702 {
2703 if (write) {
2704 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2705 return 1;
2706 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2707 } else {
2708 int val = *valp;
2709 unsigned long lval;
2710 if (val < 0) {
2711 *negp = -1;
2712 lval = (unsigned long)-val;
2713 } else {
2714 *negp = 0;
2715 lval = (unsigned long)val;
2716 }
2717 *lvalp = jiffies_to_clock_t(lval);
2718 }
2719 return 0;
2720 }
2721
2722 static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp,
2723 int *valp,
2724 int write, void *data)
2725 {
2726 if (write) {
2727 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2728 } else {
2729 int val = *valp;
2730 unsigned long lval;
2731 if (val < 0) {
2732 *negp = -1;
2733 lval = (unsigned long)-val;
2734 } else {
2735 *negp = 0;
2736 lval = (unsigned long)val;
2737 }
2738 *lvalp = jiffies_to_msecs(lval);
2739 }
2740 return 0;
2741 }
2742
2743 /**
2744 * proc_dointvec_jiffies - read a vector of integers as seconds
2745 * @table: the sysctl table
2746 * @write: %TRUE if this is a write to the sysctl file
2747 * @filp: the file structure
2748 * @buffer: the user buffer
2749 * @lenp: the size of the user buffer
2750 * @ppos: file position
2751 *
2752 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2753 * values from/to the user buffer, treated as an ASCII string.
2754 * The values read are assumed to be in seconds, and are converted into
2755 * jiffies.
2756 *
2757 * Returns 0 on success.
2758 */
2759 int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
2760 void __user *buffer, size_t *lenp, loff_t *ppos)
2761 {
2762 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2763 do_proc_dointvec_jiffies_conv,NULL);
2764 }
2765
2766 /**
2767 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2768 * @table: the sysctl table
2769 * @write: %TRUE if this is a write to the sysctl file
2770 * @filp: the file structure
2771 * @buffer: the user buffer
2772 * @lenp: the size of the user buffer
2773 * @ppos: pointer to the file position
2774 *
2775 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2776 * values from/to the user buffer, treated as an ASCII string.
2777 * The values read are assumed to be in 1/USER_HZ seconds, and
2778 * are converted into jiffies.
2779 *
2780 * Returns 0 on success.
2781 */
2782 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
2783 void __user *buffer, size_t *lenp, loff_t *ppos)
2784 {
2785 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2786 do_proc_dointvec_userhz_jiffies_conv,NULL);
2787 }
2788
2789 /**
2790 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2791 * @table: the sysctl table
2792 * @write: %TRUE if this is a write to the sysctl file
2793 * @filp: the file structure
2794 * @buffer: the user buffer
2795 * @lenp: the size of the user buffer
2796 * @ppos: file position
2797 * @ppos: the current position in the file
2798 *
2799 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2800 * values from/to the user buffer, treated as an ASCII string.
2801 * The values read are assumed to be in 1/1000 seconds, and
2802 * are converted into jiffies.
2803 *
2804 * Returns 0 on success.
2805 */
2806 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
2807 void __user *buffer, size_t *lenp, loff_t *ppos)
2808 {
2809 return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2810 do_proc_dointvec_ms_jiffies_conv, NULL);
2811 }
2812
2813 static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
2814 void __user *buffer, size_t *lenp, loff_t *ppos)
2815 {
2816 struct pid *new_pid;
2817 pid_t tmp;
2818 int r;
2819
2820 tmp = pid_vnr(cad_pid);
2821
2822 r = __do_proc_dointvec(&tmp, table, write, filp, buffer,
2823 lenp, ppos, NULL, NULL);
2824 if (r || !write)
2825 return r;
2826
2827 new_pid = find_get_pid(tmp);
2828 if (!new_pid)
2829 return -ESRCH;
2830
2831 put_pid(xchg(&cad_pid, new_pid));
2832 return 0;
2833 }
2834
2835 #else /* CONFIG_PROC_FS */
2836
2837 int proc_dostring(struct ctl_table *table, int write, struct file *filp,
2838 void __user *buffer, size_t *lenp, loff_t *ppos)
2839 {
2840 return -ENOSYS;
2841 }
2842
2843 int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2844 void __user *buffer, size_t *lenp, loff_t *ppos)
2845 {
2846 return -ENOSYS;
2847 }
2848
2849 int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
2850 void __user *buffer, size_t *lenp, loff_t *ppos)
2851 {
2852 return -ENOSYS;
2853 }
2854
2855 int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
2856 void __user *buffer, size_t *lenp, loff_t *ppos)
2857 {
2858 return -ENOSYS;
2859 }
2860
2861 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
2862 void __user *buffer, size_t *lenp, loff_t *ppos)
2863 {
2864 return -ENOSYS;
2865 }
2866
2867 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
2868 void __user *buffer, size_t *lenp, loff_t *ppos)
2869 {
2870 return -ENOSYS;
2871 }
2872
2873 int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
2874 void __user *buffer, size_t *lenp, loff_t *ppos)
2875 {
2876 return -ENOSYS;
2877 }
2878
2879 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2880 struct file *filp,
2881 void __user *buffer,
2882 size_t *lenp, loff_t *ppos)
2883 {
2884 return -ENOSYS;
2885 }
2886
2887
2888 #endif /* CONFIG_PROC_FS */
2889
2890
2891 #ifdef CONFIG_SYSCTL_SYSCALL
2892 /*
2893 * General sysctl support routines
2894 */
2895
2896 /* The generic sysctl data routine (used if no strategy routine supplied) */
2897 int sysctl_data(struct ctl_table *table,
2898 void __user *oldval, size_t __user *oldlenp,
2899 void __user *newval, size_t newlen)
2900 {
2901 size_t len;
2902
2903 /* Get out of I don't have a variable */
2904 if (!table->data || !table->maxlen)
2905 return -ENOTDIR;
2906
2907 if (oldval && oldlenp) {
2908 if (get_user(len, oldlenp))
2909 return -EFAULT;
2910 if (len) {
2911 if (len > table->maxlen)
2912 len = table->maxlen;
2913 if (copy_to_user(oldval, table->data, len))
2914 return -EFAULT;
2915 if (put_user(len, oldlenp))
2916 return -EFAULT;
2917 }
2918 }
2919
2920 if (newval && newlen) {
2921 if (newlen > table->maxlen)
2922 newlen = table->maxlen;
2923
2924 if (copy_from_user(table->data, newval, newlen))
2925 return -EFAULT;
2926 }
2927 return 1;
2928 }
2929
2930 /* The generic string strategy routine: */
2931 int sysctl_string(struct ctl_table *table,
2932 void __user *oldval, size_t __user *oldlenp,
2933 void __user *newval, size_t newlen)
2934 {
2935 if (!table->data || !table->maxlen)
2936 return -ENOTDIR;
2937
2938 if (oldval && oldlenp) {
2939 size_t bufsize;
2940 if (get_user(bufsize, oldlenp))
2941 return -EFAULT;
2942 if (bufsize) {
2943 size_t len = strlen(table->data), copied;
2944
2945 /* This shouldn't trigger for a well-formed sysctl */
2946 if (len > table->maxlen)
2947 len = table->maxlen;
2948
2949 /* Copy up to a max of bufsize-1 bytes of the string */
2950 copied = (len >= bufsize) ? bufsize - 1 : len;
2951
2952 if (copy_to_user(oldval, table->data, copied) ||
2953 put_user(0, (char __user *)(oldval + copied)))
2954 return -EFAULT;
2955 if (put_user(len, oldlenp))
2956 return -EFAULT;
2957 }
2958 }
2959 if (newval && newlen) {
2960 size_t len = newlen;
2961 if (len > table->maxlen)
2962 len = table->maxlen;
2963 if(copy_from_user(table->data, newval, len))
2964 return -EFAULT;
2965 if (len == table->maxlen)
2966 len--;
2967 ((char *) table->data)[len] = 0;
2968 }
2969 return 1;
2970 }
2971
2972 /*
2973 * This function makes sure that all of the integers in the vector
2974 * are between the minimum and maximum values given in the arrays
2975 * table->extra1 and table->extra2, respectively.
2976 */
2977 int sysctl_intvec(struct ctl_table *table,
2978 void __user *oldval, size_t __user *oldlenp,
2979 void __user *newval, size_t newlen)
2980 {
2981
2982 if (newval && newlen) {
2983 int __user *vec = (int __user *) newval;
2984 int *min = (int *) table->extra1;
2985 int *max = (int *) table->extra2;
2986 size_t length;
2987 int i;
2988
2989 if (newlen % sizeof(int) != 0)
2990 return -EINVAL;
2991
2992 if (!table->extra1 && !table->extra2)
2993 return 0;
2994
2995 if (newlen > table->maxlen)
2996 newlen = table->maxlen;
2997 length = newlen / sizeof(int);
2998
2999 for (i = 0; i < length; i++) {
3000 int value;
3001 if (get_user(value, vec + i))
3002 return -EFAULT;
3003 if (min && value < min[i])
3004 return -EINVAL;
3005 if (max && value > max[i])
3006 return -EINVAL;
3007 }
3008 }
3009 return 0;
3010 }
3011
3012 /* Strategy function to convert jiffies to seconds */
3013 int sysctl_jiffies(struct ctl_table *table,
3014 void __user *oldval, size_t __user *oldlenp,
3015 void __user *newval, size_t newlen)
3016 {
3017 if (oldval && oldlenp) {
3018 size_t olen;
3019
3020 if (get_user(olen, oldlenp))
3021 return -EFAULT;
3022 if (olen) {
3023 int val;
3024
3025 if (olen < sizeof(int))
3026 return -EINVAL;
3027
3028 val = *(int *)(table->data) / HZ;
3029 if (put_user(val, (int __user *)oldval))
3030 return -EFAULT;
3031 if (put_user(sizeof(int), oldlenp))
3032 return -EFAULT;
3033 }
3034 }
3035 if (newval && newlen) {
3036 int new;
3037 if (newlen != sizeof(int))
3038 return -EINVAL;
3039 if (get_user(new, (int __user *)newval))
3040 return -EFAULT;
3041 *(int *)(table->data) = new*HZ;
3042 }
3043 return 1;
3044 }
3045
3046 /* Strategy function to convert jiffies to seconds */
3047 int sysctl_ms_jiffies(struct ctl_table *table,
3048 void __user *oldval, size_t __user *oldlenp,
3049 void __user *newval, size_t newlen)
3050 {
3051 if (oldval && oldlenp) {
3052 size_t olen;
3053
3054 if (get_user(olen, oldlenp))
3055 return -EFAULT;
3056 if (olen) {
3057 int val;
3058
3059 if (olen < sizeof(int))
3060 return -EINVAL;
3061
3062 val = jiffies_to_msecs(*(int *)(table->data));
3063 if (put_user(val, (int __user *)oldval))
3064 return -EFAULT;
3065 if (put_user(sizeof(int), oldlenp))
3066 return -EFAULT;
3067 }
3068 }
3069 if (newval && newlen) {
3070 int new;
3071 if (newlen != sizeof(int))
3072 return -EINVAL;
3073 if (get_user(new, (int __user *)newval))
3074 return -EFAULT;
3075 *(int *)(table->data) = msecs_to_jiffies(new);
3076 }
3077 return 1;
3078 }
3079
3080
3081
3082 #else /* CONFIG_SYSCTL_SYSCALL */
3083
3084
3085 SYSCALL_DEFINE1(sysctl, struct __sysctl_args __user *, args)
3086 {
3087 struct __sysctl_args tmp;
3088 int error;
3089
3090 if (copy_from_user(&tmp, args, sizeof(tmp)))
3091 return -EFAULT;
3092
3093 error = deprecated_sysctl_warning(&tmp);
3094
3095 /* If no error reading the parameters then just -ENOSYS ... */
3096 if (!error)
3097 error = -ENOSYS;
3098
3099 return error;
3100 }
3101
3102 int sysctl_data(struct ctl_table *table,
3103 void __user *oldval, size_t __user *oldlenp,
3104 void __user *newval, size_t newlen)
3105 {
3106 return -ENOSYS;
3107 }
3108
3109 int sysctl_string(struct ctl_table *table,
3110 void __user *oldval, size_t __user *oldlenp,
3111 void __user *newval, size_t newlen)
3112 {
3113 return -ENOSYS;
3114 }
3115
3116 int sysctl_intvec(struct ctl_table *table,
3117 void __user *oldval, size_t __user *oldlenp,
3118 void __user *newval, size_t newlen)
3119 {
3120 return -ENOSYS;
3121 }
3122
3123 int sysctl_jiffies(struct ctl_table *table,
3124 void __user *oldval, size_t __user *oldlenp,
3125 void __user *newval, size_t newlen)
3126 {
3127 return -ENOSYS;
3128 }
3129
3130 int sysctl_ms_jiffies(struct ctl_table *table,
3131 void __user *oldval, size_t __user *oldlenp,
3132 void __user *newval, size_t newlen)
3133 {
3134 return -ENOSYS;
3135 }
3136
3137 #endif /* CONFIG_SYSCTL_SYSCALL */
3138
3139 static int deprecated_sysctl_warning(struct __sysctl_args *args)
3140 {
3141 static int msg_count;
3142 int name[CTL_MAXNAME];
3143 int i;
3144
3145 /* Check args->nlen. */
3146 if (args->nlen < 0 || args->nlen > CTL_MAXNAME)
3147 return -ENOTDIR;
3148
3149 /* Read in the sysctl name for better debug message logging */
3150 for (i = 0; i < args->nlen; i++)
3151 if (get_user(name[i], args->name + i))
3152 return -EFAULT;
3153
3154 /* Ignore accesses to kernel.version */
3155 if ((args->nlen == 2) && (name[0] == CTL_KERN) && (name[1] == KERN_VERSION))
3156 return 0;
3157
3158 if (msg_count < 5) {
3159 msg_count++;
3160 printk(KERN_INFO
3161 "warning: process `%s' used the deprecated sysctl "
3162 "system call with ", current->comm);
3163 for (i = 0; i < args->nlen; i++)
3164 printk("%d.", name[i]);
3165 printk("\n");
3166 }
3167 return 0;
3168 }
3169
3170 /*
3171 * No sense putting this after each symbol definition, twice,
3172 * exception granted :-)
3173 */
3174 EXPORT_SYMBOL(proc_dointvec);
3175 EXPORT_SYMBOL(proc_dointvec_jiffies);
3176 EXPORT_SYMBOL(proc_dointvec_minmax);
3177 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
3178 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
3179 EXPORT_SYMBOL(proc_dostring);
3180 EXPORT_SYMBOL(proc_doulongvec_minmax);
3181 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
3182 EXPORT_SYMBOL(register_sysctl_table);
3183 EXPORT_SYMBOL(register_sysctl_paths);
3184 EXPORT_SYMBOL(sysctl_intvec);
3185 EXPORT_SYMBOL(sysctl_jiffies);
3186 EXPORT_SYMBOL(sysctl_ms_jiffies);
3187 EXPORT_SYMBOL(sysctl_string);
3188 EXPORT_SYMBOL(sysctl_data);
3189 EXPORT_SYMBOL(unregister_sysctl_table);
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