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discard data after unsuccessful connect_neigh, implement unknown addrtype errorcode...
[cor_2_6_31.git] / kernel / sysctl.c
blob98e02328c67de053dc55bdee746ca381e526660e
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_minmax,
339 .strategy = &sysctl_intvec,
340 .extra1 = &zero,
341 .extra2 = &one,
342 },
343 #endif
344 {
345 .ctl_name = CTL_UNNUMBERED,
346 .procname = "sched_rt_period_us",
347 .data = &sysctl_sched_rt_period,
348 .maxlen = sizeof(unsigned int),
349 .mode = 0644,
350 .proc_handler = &sched_rt_handler,
351 },
352 {
353 .ctl_name = CTL_UNNUMBERED,
354 .procname = "sched_rt_runtime_us",
355 .data = &sysctl_sched_rt_runtime,
356 .maxlen = sizeof(int),
357 .mode = 0644,
358 .proc_handler = &sched_rt_handler,
359 },
360 {
361 .ctl_name = CTL_UNNUMBERED,
362 .procname = "sched_compat_yield",
363 .data = &sysctl_sched_compat_yield,
364 .maxlen = sizeof(unsigned int),
365 .mode = 0644,
366 .proc_handler = &proc_dointvec,
367 },
368 #ifdef CONFIG_PROVE_LOCKING
369 {
370 .ctl_name = CTL_UNNUMBERED,
371 .procname = "prove_locking",
372 .data = &prove_locking,
373 .maxlen = sizeof(int),
374 .mode = 0644,
375 .proc_handler = &proc_dointvec,
376 },
377 #endif
378 #ifdef CONFIG_LOCK_STAT
379 {
380 .ctl_name = CTL_UNNUMBERED,
381 .procname = "lock_stat",
382 .data = &lock_stat,
383 .maxlen = sizeof(int),
384 .mode = 0644,
385 .proc_handler = &proc_dointvec,
386 },
387 #endif
388 {
389 .ctl_name = KERN_PANIC,
390 .procname = "panic",
391 .data = &panic_timeout,
392 .maxlen = sizeof(int),
393 .mode = 0644,
394 .proc_handler = &proc_dointvec,
395 },
396 {
397 .ctl_name = KERN_CORE_USES_PID,
398 .procname = "core_uses_pid",
399 .data = &core_uses_pid,
400 .maxlen = sizeof(int),
401 .mode = 0644,
402 .proc_handler = &proc_dointvec,
403 },
404 {
405 .ctl_name = KERN_CORE_PATTERN,
406 .procname = "core_pattern",
407 .data = core_pattern,
408 .maxlen = CORENAME_MAX_SIZE,
409 .mode = 0644,
410 .proc_handler = &proc_dostring,
411 .strategy = &sysctl_string,
412 },
413 #ifdef CONFIG_PROC_SYSCTL
414 {
415 .procname = "tainted",
416 .maxlen = sizeof(long),
417 .mode = 0644,
418 .proc_handler = &proc_taint,
419 },
420 #endif
421 #ifdef CONFIG_LATENCYTOP
422 {
423 .procname = "latencytop",
424 .data = &latencytop_enabled,
425 .maxlen = sizeof(int),
426 .mode = 0644,
427 .proc_handler = &proc_dointvec,
428 },
429 #endif
430 #ifdef CONFIG_BLK_DEV_INITRD
431 {
432 .ctl_name = KERN_REALROOTDEV,
433 .procname = "real-root-dev",
434 .data = &real_root_dev,
435 .maxlen = sizeof(int),
436 .mode = 0644,
437 .proc_handler = &proc_dointvec,
438 },
439 #endif
440 {
441 .ctl_name = CTL_UNNUMBERED,
442 .procname = "print-fatal-signals",
443 .data = &print_fatal_signals,
444 .maxlen = sizeof(int),
445 .mode = 0644,
446 .proc_handler = &proc_dointvec,
447 },
448 #ifdef CONFIG_SPARC
449 {
450 .ctl_name = KERN_SPARC_REBOOT,
451 .procname = "reboot-cmd",
452 .data = reboot_command,
453 .maxlen = 256,
454 .mode = 0644,
455 .proc_handler = &proc_dostring,
456 .strategy = &sysctl_string,
457 },
458 {
459 .ctl_name = KERN_SPARC_STOP_A,
460 .procname = "stop-a",
461 .data = &stop_a_enabled,
462 .maxlen = sizeof (int),
463 .mode = 0644,
464 .proc_handler = &proc_dointvec,
465 },
466 {
467 .ctl_name = KERN_SPARC_SCONS_PWROFF,
468 .procname = "scons-poweroff",
469 .data = &scons_pwroff,
470 .maxlen = sizeof (int),
471 .mode = 0644,
472 .proc_handler = &proc_dointvec,
473 },
474 #endif
475 #ifdef CONFIG_SPARC64
476 {
477 .ctl_name = CTL_UNNUMBERED,
478 .procname = "tsb-ratio",
479 .data = &sysctl_tsb_ratio,
480 .maxlen = sizeof (int),
481 .mode = 0644,
482 .proc_handler = &proc_dointvec,
483 },
484 #endif
485 #ifdef __hppa__
486 {
487 .ctl_name = KERN_HPPA_PWRSW,
488 .procname = "soft-power",
489 .data = &pwrsw_enabled,
490 .maxlen = sizeof (int),
491 .mode = 0644,
492 .proc_handler = &proc_dointvec,
493 },
494 {
495 .ctl_name = KERN_HPPA_UNALIGNED,
496 .procname = "unaligned-trap",
497 .data = &unaligned_enabled,
498 .maxlen = sizeof (int),
499 .mode = 0644,
500 .proc_handler = &proc_dointvec,
501 },
502 #endif
503 {
504 .ctl_name = KERN_CTLALTDEL,
505 .procname = "ctrl-alt-del",
506 .data = &C_A_D,
507 .maxlen = sizeof(int),
508 .mode = 0644,
509 .proc_handler = &proc_dointvec,
510 },
511 #ifdef CONFIG_FUNCTION_TRACER
512 {
513 .ctl_name = CTL_UNNUMBERED,
514 .procname = "ftrace_enabled",
515 .data = &ftrace_enabled,
516 .maxlen = sizeof(int),
517 .mode = 0644,
518 .proc_handler = &ftrace_enable_sysctl,
519 },
520 #endif
521 #ifdef CONFIG_STACK_TRACER
522 {
523 .ctl_name = CTL_UNNUMBERED,
524 .procname = "stack_tracer_enabled",
525 .data = &stack_tracer_enabled,
526 .maxlen = sizeof(int),
527 .mode = 0644,
528 .proc_handler = &stack_trace_sysctl,
529 },
530 #endif
531 #ifdef CONFIG_TRACING
532 {
533 .ctl_name = CTL_UNNUMBERED,
534 .procname = "ftrace_dump_on_oops",
535 .data = &ftrace_dump_on_oops,
536 .maxlen = sizeof(int),
537 .mode = 0644,
538 .proc_handler = &proc_dointvec,
539 },
540 #endif
541 #ifdef CONFIG_MODULES
542 {
543 .ctl_name = KERN_MODPROBE,
544 .procname = "modprobe",
545 .data = &modprobe_path,
546 .maxlen = KMOD_PATH_LEN,
547 .mode = 0644,
548 .proc_handler = &proc_dostring,
549 .strategy = &sysctl_string,
550 },
551 {
552 .ctl_name = CTL_UNNUMBERED,
553 .procname = "modules_disabled",
554 .data = &modules_disabled,
555 .maxlen = sizeof(int),
556 .mode = 0644,
557 /* only handle a transition from default "0" to "1" */
558 .proc_handler = &proc_dointvec_minmax,
559 .extra1 = &one,
560 .extra2 = &one,
561 },
562 #endif
563 #if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET)
564 {
565 .ctl_name = KERN_HOTPLUG,
566 .procname = "hotplug",
567 .data = &uevent_helper,
568 .maxlen = UEVENT_HELPER_PATH_LEN,
569 .mode = 0644,
570 .proc_handler = &proc_dostring,
571 .strategy = &sysctl_string,
572 },
573 #endif
574 #ifdef CONFIG_CHR_DEV_SG
575 {
576 .ctl_name = KERN_SG_BIG_BUFF,
577 .procname = "sg-big-buff",
578 .data = &sg_big_buff,
579 .maxlen = sizeof (int),
580 .mode = 0444,
581 .proc_handler = &proc_dointvec,
582 },
583 #endif
584 #ifdef CONFIG_BSD_PROCESS_ACCT
585 {
586 .ctl_name = KERN_ACCT,
587 .procname = "acct",
588 .data = &acct_parm,
589 .maxlen = 3*sizeof(int),
590 .mode = 0644,
591 .proc_handler = &proc_dointvec,
592 },
593 #endif
594 #ifdef CONFIG_MAGIC_SYSRQ
595 {
596 .ctl_name = KERN_SYSRQ,
597 .procname = "sysrq",
598 .data = &__sysrq_enabled,
599 .maxlen = sizeof (int),
600 .mode = 0644,
601 .proc_handler = &proc_dointvec,
602 },
603 #endif
604 #ifdef CONFIG_PROC_SYSCTL
605 {
606 .procname = "cad_pid",
607 .data = NULL,
608 .maxlen = sizeof (int),
609 .mode = 0600,
610 .proc_handler = &proc_do_cad_pid,
611 },
612 #endif
613 {
614 .ctl_name = KERN_MAX_THREADS,
615 .procname = "threads-max",
616 .data = &max_threads,
617 .maxlen = sizeof(int),
618 .mode = 0644,
619 .proc_handler = &proc_dointvec,
620 },
621 {
622 .ctl_name = KERN_RANDOM,
623 .procname = "random",
624 .mode = 0555,
625 .child = random_table,
626 },
627 {
628 .ctl_name = KERN_OVERFLOWUID,
629 .procname = "overflowuid",
630 .data = &overflowuid,
631 .maxlen = sizeof(int),
632 .mode = 0644,
633 .proc_handler = &proc_dointvec_minmax,
634 .strategy = &sysctl_intvec,
635 .extra1 = &minolduid,
636 .extra2 = &maxolduid,
637 },
638 {
639 .ctl_name = KERN_OVERFLOWGID,
640 .procname = "overflowgid",
641 .data = &overflowgid,
642 .maxlen = sizeof(int),
643 .mode = 0644,
644 .proc_handler = &proc_dointvec_minmax,
645 .strategy = &sysctl_intvec,
646 .extra1 = &minolduid,
647 .extra2 = &maxolduid,
648 },
649 #ifdef CONFIG_S390
650 #ifdef CONFIG_MATHEMU
651 {
652 .ctl_name = KERN_IEEE_EMULATION_WARNINGS,
653 .procname = "ieee_emulation_warnings",
654 .data = &sysctl_ieee_emulation_warnings,
655 .maxlen = sizeof(int),
656 .mode = 0644,
657 .proc_handler = &proc_dointvec,
658 },
659 #endif
660 {
661 .ctl_name = KERN_S390_USER_DEBUG_LOGGING,
662 .procname = "userprocess_debug",
663 .data = &sysctl_userprocess_debug,
664 .maxlen = sizeof(int),
665 .mode = 0644,
666 .proc_handler = &proc_dointvec,
667 },
668 #endif
669 {
670 .ctl_name = KERN_PIDMAX,
671 .procname = "pid_max",
672 .data = &pid_max,
673 .maxlen = sizeof (int),
674 .mode = 0644,
675 .proc_handler = &proc_dointvec_minmax,
676 .strategy = sysctl_intvec,
677 .extra1 = &pid_max_min,
678 .extra2 = &pid_max_max,
679 },
680 {
681 .ctl_name = KERN_PANIC_ON_OOPS,
682 .procname = "panic_on_oops",
683 .data = &panic_on_oops,
684 .maxlen = sizeof(int),
685 .mode = 0644,
686 .proc_handler = &proc_dointvec,
687 },
688 #if defined CONFIG_PRINTK
689 {
690 .ctl_name = KERN_PRINTK,
691 .procname = "printk",
692 .data = &console_loglevel,
693 .maxlen = 4*sizeof(int),
694 .mode = 0644,
695 .proc_handler = &proc_dointvec,
696 },
697 {
698 .ctl_name = KERN_PRINTK_RATELIMIT,
699 .procname = "printk_ratelimit",
700 .data = &printk_ratelimit_state.interval,
701 .maxlen = sizeof(int),
702 .mode = 0644,
703 .proc_handler = &proc_dointvec_jiffies,
704 .strategy = &sysctl_jiffies,
705 },
706 {
707 .ctl_name = KERN_PRINTK_RATELIMIT_BURST,
708 .procname = "printk_ratelimit_burst",
709 .data = &printk_ratelimit_state.burst,
710 .maxlen = sizeof(int),
711 .mode = 0644,
712 .proc_handler = &proc_dointvec,
713 },
714 #endif
715 {
716 .ctl_name = KERN_NGROUPS_MAX,
717 .procname = "ngroups_max",
718 .data = &ngroups_max,
719 .maxlen = sizeof (int),
720 .mode = 0444,
721 .proc_handler = &proc_dointvec,
722 },
723 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
724 {
725 .ctl_name = KERN_UNKNOWN_NMI_PANIC,
726 .procname = "unknown_nmi_panic",
727 .data = &unknown_nmi_panic,
728 .maxlen = sizeof (int),
729 .mode = 0644,
730 .proc_handler = &proc_dointvec,
731 },
732 {
733 .procname = "nmi_watchdog",
734 .data = &nmi_watchdog_enabled,
735 .maxlen = sizeof (int),
736 .mode = 0644,
737 .proc_handler = &proc_nmi_enabled,
738 },
739 #endif
740 #if defined(CONFIG_X86)
741 {
742 .ctl_name = KERN_PANIC_ON_NMI,
743 .procname = "panic_on_unrecovered_nmi",
744 .data = &panic_on_unrecovered_nmi,
745 .maxlen = sizeof(int),
746 .mode = 0644,
747 .proc_handler = &proc_dointvec,
748 },
749 {
750 .ctl_name = CTL_UNNUMBERED,
751 .procname = "panic_on_io_nmi",
752 .data = &panic_on_io_nmi,
753 .maxlen = sizeof(int),
754 .mode = 0644,
755 .proc_handler = &proc_dointvec,
756 },
757 {
758 .ctl_name = KERN_BOOTLOADER_TYPE,
759 .procname = "bootloader_type",
760 .data = &bootloader_type,
761 .maxlen = sizeof (int),
762 .mode = 0444,
763 .proc_handler = &proc_dointvec,
764 },
765 {
766 .ctl_name = CTL_UNNUMBERED,
767 .procname = "bootloader_version",
768 .data = &bootloader_version,
769 .maxlen = sizeof (int),
770 .mode = 0444,
771 .proc_handler = &proc_dointvec,
772 },
773 {
774 .ctl_name = CTL_UNNUMBERED,
775 .procname = "kstack_depth_to_print",
776 .data = &kstack_depth_to_print,
777 .maxlen = sizeof(int),
778 .mode = 0644,
779 .proc_handler = &proc_dointvec,
780 },
781 {
782 .ctl_name = CTL_UNNUMBERED,
783 .procname = "io_delay_type",
784 .data = &io_delay_type,
785 .maxlen = sizeof(int),
786 .mode = 0644,
787 .proc_handler = &proc_dointvec,
788 },
789 #endif
790 #if defined(CONFIG_MMU)
791 {
792 .ctl_name = KERN_RANDOMIZE,
793 .procname = "randomize_va_space",
794 .data = &randomize_va_space,
795 .maxlen = sizeof(int),
796 .mode = 0644,
797 .proc_handler = &proc_dointvec,
798 },
799 #endif
800 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
801 {
802 .ctl_name = KERN_SPIN_RETRY,
803 .procname = "spin_retry",
804 .data = &spin_retry,
805 .maxlen = sizeof (int),
806 .mode = 0644,
807 .proc_handler = &proc_dointvec,
808 },
809 #endif
810 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
811 {
812 .procname = "acpi_video_flags",
813 .data = &acpi_realmode_flags,
814 .maxlen = sizeof (unsigned long),
815 .mode = 0644,
816 .proc_handler = &proc_doulongvec_minmax,
817 },
818 #endif
819 #ifdef CONFIG_IA64
820 {
821 .ctl_name = KERN_IA64_UNALIGNED,
822 .procname = "ignore-unaligned-usertrap",
823 .data = &no_unaligned_warning,
824 .maxlen = sizeof (int),
825 .mode = 0644,
826 .proc_handler = &proc_dointvec,
827 },
828 {
829 .ctl_name = CTL_UNNUMBERED,
830 .procname = "unaligned-dump-stack",
831 .data = &unaligned_dump_stack,
832 .maxlen = sizeof (int),
833 .mode = 0644,
834 .proc_handler = &proc_dointvec,
835 },
836 #endif
837 #ifdef CONFIG_DETECT_SOFTLOCKUP
838 {
839 .ctl_name = CTL_UNNUMBERED,
840 .procname = "softlockup_panic",
841 .data = &softlockup_panic,
842 .maxlen = sizeof(int),
843 .mode = 0644,
844 .proc_handler = &proc_dointvec_minmax,
845 .strategy = &sysctl_intvec,
846 .extra1 = &zero,
847 .extra2 = &one,
848 },
849 {
850 .ctl_name = CTL_UNNUMBERED,
851 .procname = "softlockup_thresh",
852 .data = &softlockup_thresh,
853 .maxlen = sizeof(int),
854 .mode = 0644,
855 .proc_handler = &proc_dosoftlockup_thresh,
856 .strategy = &sysctl_intvec,
857 .extra1 = &neg_one,
858 .extra2 = &sixty,
859 },
860 #endif
861 #ifdef CONFIG_DETECT_HUNG_TASK
862 {
863 .ctl_name = CTL_UNNUMBERED,
864 .procname = "hung_task_panic",
865 .data = &sysctl_hung_task_panic,
866 .maxlen = sizeof(int),
867 .mode = 0644,
868 .proc_handler = &proc_dointvec_minmax,
869 .strategy = &sysctl_intvec,
870 .extra1 = &zero,
871 .extra2 = &one,
872 },
873 {
874 .ctl_name = CTL_UNNUMBERED,
875 .procname = "hung_task_check_count",
876 .data = &sysctl_hung_task_check_count,
877 .maxlen = sizeof(unsigned long),
878 .mode = 0644,
879 .proc_handler = &proc_doulongvec_minmax,
880 .strategy = &sysctl_intvec,
881 },
882 {
883 .ctl_name = CTL_UNNUMBERED,
884 .procname = "hung_task_timeout_secs",
885 .data = &sysctl_hung_task_timeout_secs,
886 .maxlen = sizeof(unsigned long),
887 .mode = 0644,
888 .proc_handler = &proc_dohung_task_timeout_secs,
889 .strategy = &sysctl_intvec,
890 },
891 {
892 .ctl_name = CTL_UNNUMBERED,
893 .procname = "hung_task_warnings",
894 .data = &sysctl_hung_task_warnings,
895 .maxlen = sizeof(unsigned long),
896 .mode = 0644,
897 .proc_handler = &proc_doulongvec_minmax,
898 .strategy = &sysctl_intvec,
899 },
900 #endif
901 #ifdef CONFIG_COMPAT
902 {
903 .ctl_name = KERN_COMPAT_LOG,
904 .procname = "compat-log",
905 .data = &compat_log,
906 .maxlen = sizeof (int),
907 .mode = 0644,
908 .proc_handler = &proc_dointvec,
909 },
910 #endif
911 #ifdef CONFIG_RT_MUTEXES
912 {
913 .ctl_name = KERN_MAX_LOCK_DEPTH,
914 .procname = "max_lock_depth",
915 .data = &max_lock_depth,
916 .maxlen = sizeof(int),
917 .mode = 0644,
918 .proc_handler = &proc_dointvec,
919 },
920 #endif
921 {
922 .ctl_name = CTL_UNNUMBERED,
923 .procname = "poweroff_cmd",
924 .data = &poweroff_cmd,
925 .maxlen = POWEROFF_CMD_PATH_LEN,
926 .mode = 0644,
927 .proc_handler = &proc_dostring,
928 .strategy = &sysctl_string,
929 },
930 #ifdef CONFIG_KEYS
931 {
932 .ctl_name = CTL_UNNUMBERED,
933 .procname = "keys",
934 .mode = 0555,
935 .child = key_sysctls,
936 },
937 #endif
938 #ifdef CONFIG_RCU_TORTURE_TEST
939 {
940 .ctl_name = CTL_UNNUMBERED,
941 .procname = "rcutorture_runnable",
942 .data = &rcutorture_runnable,
943 .maxlen = sizeof(int),
944 .mode = 0644,
945 .proc_handler = &proc_dointvec,
946 },
947 #endif
948 #ifdef CONFIG_SLOW_WORK
949 {
950 .ctl_name = CTL_UNNUMBERED,
951 .procname = "slow-work",
952 .mode = 0555,
953 .child = slow_work_sysctls,
954 },
955 #endif
956 #ifdef CONFIG_PERF_COUNTERS
957 {
958 .ctl_name = CTL_UNNUMBERED,
959 .procname = "perf_counter_paranoid",
960 .data = &sysctl_perf_counter_paranoid,
961 .maxlen = sizeof(sysctl_perf_counter_paranoid),
962 .mode = 0644,
963 .proc_handler = &proc_dointvec,
964 },
965 {
966 .ctl_name = CTL_UNNUMBERED,
967 .procname = "perf_counter_mlock_kb",
968 .data = &sysctl_perf_counter_mlock,
969 .maxlen = sizeof(sysctl_perf_counter_mlock),
970 .mode = 0644,
971 .proc_handler = &proc_dointvec,
972 },
973 {
974 .ctl_name = CTL_UNNUMBERED,
975 .procname = "perf_counter_max_sample_rate",
976 .data = &sysctl_perf_counter_sample_rate,
977 .maxlen = sizeof(sysctl_perf_counter_sample_rate),
978 .mode = 0644,
979 .proc_handler = &proc_dointvec,
980 },
981 #endif
982 #ifdef CONFIG_KMEMCHECK
983 {
984 .ctl_name = CTL_UNNUMBERED,
985 .procname = "kmemcheck",
986 .data = &kmemcheck_enabled,
987 .maxlen = sizeof(int),
988 .mode = 0644,
989 .proc_handler = &proc_dointvec,
990 },
991 #endif
992
993 /*
994 * NOTE: do not add new entries to this table unless you have read
995 * Documentation/sysctl/ctl_unnumbered.txt
996 */
997 { .ctl_name = 0 }
998 };
999
1000 static struct ctl_table vm_table[] = {
1001 {
1002 .ctl_name = VM_OVERCOMMIT_MEMORY,
1003 .procname = "overcommit_memory",
1004 .data = &sysctl_overcommit_memory,
1005 .maxlen = sizeof(sysctl_overcommit_memory),
1006 .mode = 0644,
1007 .proc_handler = &proc_dointvec,
1008 },
1009 {
1010 .ctl_name = VM_PANIC_ON_OOM,
1011 .procname = "panic_on_oom",
1012 .data = &sysctl_panic_on_oom,
1013 .maxlen = sizeof(sysctl_panic_on_oom),
1014 .mode = 0644,
1015 .proc_handler = &proc_dointvec,
1016 },
1017 {
1018 .ctl_name = CTL_UNNUMBERED,
1019 .procname = "oom_kill_allocating_task",
1020 .data = &sysctl_oom_kill_allocating_task,
1021 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
1022 .mode = 0644,
1023 .proc_handler = &proc_dointvec,
1024 },
1025 {
1026 .ctl_name = CTL_UNNUMBERED,
1027 .procname = "oom_dump_tasks",
1028 .data = &sysctl_oom_dump_tasks,
1029 .maxlen = sizeof(sysctl_oom_dump_tasks),
1030 .mode = 0644,
1031 .proc_handler = &proc_dointvec,
1032 },
1033 {
1034 .ctl_name = VM_OVERCOMMIT_RATIO,
1035 .procname = "overcommit_ratio",
1036 .data = &sysctl_overcommit_ratio,
1037 .maxlen = sizeof(sysctl_overcommit_ratio),
1038 .mode = 0644,
1039 .proc_handler = &proc_dointvec,
1040 },
1041 {
1042 .ctl_name = VM_PAGE_CLUSTER,
1043 .procname = "page-cluster",
1044 .data = &page_cluster,
1045 .maxlen = sizeof(int),
1046 .mode = 0644,
1047 .proc_handler = &proc_dointvec,
1048 },
1049 {
1050 .ctl_name = VM_DIRTY_BACKGROUND,
1051 .procname = "dirty_background_ratio",
1052 .data = &dirty_background_ratio,
1053 .maxlen = sizeof(dirty_background_ratio),
1054 .mode = 0644,
1055 .proc_handler = &dirty_background_ratio_handler,
1056 .strategy = &sysctl_intvec,
1057 .extra1 = &zero,
1058 .extra2 = &one_hundred,
1059 },
1060 {
1061 .ctl_name = CTL_UNNUMBERED,
1062 .procname = "dirty_background_bytes",
1063 .data = &dirty_background_bytes,
1064 .maxlen = sizeof(dirty_background_bytes),
1065 .mode = 0644,
1066 .proc_handler = &dirty_background_bytes_handler,
1067 .strategy = &sysctl_intvec,
1068 .extra1 = &one_ul,
1069 },
1070 {
1071 .ctl_name = VM_DIRTY_RATIO,
1072 .procname = "dirty_ratio",
1073 .data = &vm_dirty_ratio,
1074 .maxlen = sizeof(vm_dirty_ratio),
1075 .mode = 0644,
1076 .proc_handler = &dirty_ratio_handler,
1077 .strategy = &sysctl_intvec,
1078 .extra1 = &zero,
1079 .extra2 = &one_hundred,
1080 },
1081 {
1082 .ctl_name = CTL_UNNUMBERED,
1083 .procname = "dirty_bytes",
1084 .data = &vm_dirty_bytes,
1085 .maxlen = sizeof(vm_dirty_bytes),
1086 .mode = 0644,
1087 .proc_handler = &dirty_bytes_handler,
1088 .strategy = &sysctl_intvec,
1089 .extra1 = &dirty_bytes_min,
1090 },
1091 {
1092 .procname = "dirty_writeback_centisecs",
1093 .data = &dirty_writeback_interval,
1094 .maxlen = sizeof(dirty_writeback_interval),
1095 .mode = 0644,
1096 .proc_handler = &dirty_writeback_centisecs_handler,
1097 },
1098 {
1099 .procname = "dirty_expire_centisecs",
1100 .data = &dirty_expire_interval,
1101 .maxlen = sizeof(dirty_expire_interval),
1102 .mode = 0644,
1103 .proc_handler = &proc_dointvec,
1104 },
1105 {
1106 .ctl_name = VM_NR_PDFLUSH_THREADS,
1107 .procname = "nr_pdflush_threads",
1108 .data = &nr_pdflush_threads,
1109 .maxlen = sizeof nr_pdflush_threads,
1110 .mode = 0444 /* read-only*/,
1111 .proc_handler = &proc_dointvec,
1112 },
1113 {
1114 .ctl_name = VM_SWAPPINESS,
1115 .procname = "swappiness",
1116 .data = &vm_swappiness,
1117 .maxlen = sizeof(vm_swappiness),
1118 .mode = 0644,
1119 .proc_handler = &proc_dointvec_minmax,
1120 .strategy = &sysctl_intvec,
1121 .extra1 = &zero,
1122 .extra2 = &one_hundred,
1123 },
1124 #ifdef CONFIG_HUGETLB_PAGE
1125 {
1126 .procname = "nr_hugepages",
1127 .data = NULL,
1128 .maxlen = sizeof(unsigned long),
1129 .mode = 0644,
1130 .proc_handler = &hugetlb_sysctl_handler,
1131 .extra1 = (void *)&hugetlb_zero,
1132 .extra2 = (void *)&hugetlb_infinity,
1133 },
1134 {
1135 .ctl_name = VM_HUGETLB_GROUP,
1136 .procname = "hugetlb_shm_group",
1137 .data = &sysctl_hugetlb_shm_group,
1138 .maxlen = sizeof(gid_t),
1139 .mode = 0644,
1140 .proc_handler = &proc_dointvec,
1141 },
1142 {
1143 .ctl_name = CTL_UNNUMBERED,
1144 .procname = "hugepages_treat_as_movable",
1145 .data = &hugepages_treat_as_movable,
1146 .maxlen = sizeof(int),
1147 .mode = 0644,
1148 .proc_handler = &hugetlb_treat_movable_handler,
1149 },
1150 {
1151 .ctl_name = CTL_UNNUMBERED,
1152 .procname = "nr_overcommit_hugepages",
1153 .data = NULL,
1154 .maxlen = sizeof(unsigned long),
1155 .mode = 0644,
1156 .proc_handler = &hugetlb_overcommit_handler,
1157 .extra1 = (void *)&hugetlb_zero,
1158 .extra2 = (void *)&hugetlb_infinity,
1159 },
1160 #endif
1161 {
1162 .ctl_name = VM_LOWMEM_RESERVE_RATIO,
1163 .procname = "lowmem_reserve_ratio",
1164 .data = &sysctl_lowmem_reserve_ratio,
1165 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1166 .mode = 0644,
1167 .proc_handler = &lowmem_reserve_ratio_sysctl_handler,
1168 .strategy = &sysctl_intvec,
1169 },
1170 {
1171 .ctl_name = VM_DROP_PAGECACHE,
1172 .procname = "drop_caches",
1173 .data = &sysctl_drop_caches,
1174 .maxlen = sizeof(int),
1175 .mode = 0644,
1176 .proc_handler = drop_caches_sysctl_handler,
1177 .strategy = &sysctl_intvec,
1178 },
1179 {
1180 .ctl_name = VM_MIN_FREE_KBYTES,
1181 .procname = "min_free_kbytes",
1182 .data = &min_free_kbytes,
1183 .maxlen = sizeof(min_free_kbytes),
1184 .mode = 0644,
1185 .proc_handler = &min_free_kbytes_sysctl_handler,
1186 .strategy = &sysctl_intvec,
1187 .extra1 = &zero,
1188 },
1189 {
1190 .ctl_name = VM_PERCPU_PAGELIST_FRACTION,
1191 .procname = "percpu_pagelist_fraction",
1192 .data = &percpu_pagelist_fraction,
1193 .maxlen = sizeof(percpu_pagelist_fraction),
1194 .mode = 0644,
1195 .proc_handler = &percpu_pagelist_fraction_sysctl_handler,
1196 .strategy = &sysctl_intvec,
1197 .extra1 = &min_percpu_pagelist_fract,
1198 },
1199 #ifdef CONFIG_MMU
1200 {
1201 .ctl_name = VM_MAX_MAP_COUNT,
1202 .procname = "max_map_count",
1203 .data = &sysctl_max_map_count,
1204 .maxlen = sizeof(sysctl_max_map_count),
1205 .mode = 0644,
1206 .proc_handler = &proc_dointvec
1207 },
1208 #else
1209 {
1210 .ctl_name = CTL_UNNUMBERED,
1211 .procname = "nr_trim_pages",
1212 .data = &sysctl_nr_trim_pages,
1213 .maxlen = sizeof(sysctl_nr_trim_pages),
1214 .mode = 0644,
1215 .proc_handler = &proc_dointvec_minmax,
1216 .strategy = &sysctl_intvec,
1217 .extra1 = &zero,
1218 },
1219 #endif
1220 {
1221 .ctl_name = VM_LAPTOP_MODE,
1222 .procname = "laptop_mode",
1223 .data = &laptop_mode,
1224 .maxlen = sizeof(laptop_mode),
1225 .mode = 0644,
1226 .proc_handler = &proc_dointvec_jiffies,
1227 .strategy = &sysctl_jiffies,
1228 },
1229 {
1230 .ctl_name = VM_BLOCK_DUMP,
1231 .procname = "block_dump",
1232 .data = &block_dump,
1233 .maxlen = sizeof(block_dump),
1234 .mode = 0644,
1235 .proc_handler = &proc_dointvec,
1236 .strategy = &sysctl_intvec,
1237 .extra1 = &zero,
1238 },
1239 {
1240 .ctl_name = VM_VFS_CACHE_PRESSURE,
1241 .procname = "vfs_cache_pressure",
1242 .data = &sysctl_vfs_cache_pressure,
1243 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1244 .mode = 0644,
1245 .proc_handler = &proc_dointvec,
1246 .strategy = &sysctl_intvec,
1247 .extra1 = &zero,
1248 },
1249 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1250 {
1251 .ctl_name = VM_LEGACY_VA_LAYOUT,
1252 .procname = "legacy_va_layout",
1253 .data = &sysctl_legacy_va_layout,
1254 .maxlen = sizeof(sysctl_legacy_va_layout),
1255 .mode = 0644,
1256 .proc_handler = &proc_dointvec,
1257 .strategy = &sysctl_intvec,
1258 .extra1 = &zero,
1259 },
1260 #endif
1261 #ifdef CONFIG_NUMA
1262 {
1263 .ctl_name = VM_ZONE_RECLAIM_MODE,
1264 .procname = "zone_reclaim_mode",
1265 .data = &zone_reclaim_mode,
1266 .maxlen = sizeof(zone_reclaim_mode),
1267 .mode = 0644,
1268 .proc_handler = &proc_dointvec,
1269 .strategy = &sysctl_intvec,
1270 .extra1 = &zero,
1271 },
1272 {
1273 .ctl_name = VM_MIN_UNMAPPED,
1274 .procname = "min_unmapped_ratio",
1275 .data = &sysctl_min_unmapped_ratio,
1276 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1277 .mode = 0644,
1278 .proc_handler = &sysctl_min_unmapped_ratio_sysctl_handler,
1279 .strategy = &sysctl_intvec,
1280 .extra1 = &zero,
1281 .extra2 = &one_hundred,
1282 },
1283 {
1284 .ctl_name = VM_MIN_SLAB,
1285 .procname = "min_slab_ratio",
1286 .data = &sysctl_min_slab_ratio,
1287 .maxlen = sizeof(sysctl_min_slab_ratio),
1288 .mode = 0644,
1289 .proc_handler = &sysctl_min_slab_ratio_sysctl_handler,
1290 .strategy = &sysctl_intvec,
1291 .extra1 = &zero,
1292 .extra2 = &one_hundred,
1293 },
1294 #endif
1295 #ifdef CONFIG_SMP
1296 {
1297 .ctl_name = CTL_UNNUMBERED,
1298 .procname = "stat_interval",
1299 .data = &sysctl_stat_interval,
1300 .maxlen = sizeof(sysctl_stat_interval),
1301 .mode = 0644,
1302 .proc_handler = &proc_dointvec_jiffies,
1303 .strategy = &sysctl_jiffies,
1304 },
1305 #endif
1306 {
1307 .ctl_name = CTL_UNNUMBERED,
1308 .procname = "mmap_min_addr",
1309 .data = &mmap_min_addr,
1310 .maxlen = sizeof(unsigned long),
1311 .mode = 0644,
1312 .proc_handler = &proc_doulongvec_minmax,
1313 },
1314 #ifdef CONFIG_NUMA
1315 {
1316 .ctl_name = CTL_UNNUMBERED,
1317 .procname = "numa_zonelist_order",
1318 .data = &numa_zonelist_order,
1319 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1320 .mode = 0644,
1321 .proc_handler = &numa_zonelist_order_handler,
1322 .strategy = &sysctl_string,
1323 },
1324 #endif
1325 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1326 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1327 {
1328 .ctl_name = VM_VDSO_ENABLED,
1329 .procname = "vdso_enabled",
1330 .data = &vdso_enabled,
1331 .maxlen = sizeof(vdso_enabled),
1332 .mode = 0644,
1333 .proc_handler = &proc_dointvec,
1334 .strategy = &sysctl_intvec,
1335 .extra1 = &zero,
1336 },
1337 #endif
1338 #ifdef CONFIG_HIGHMEM
1339 {
1340 .ctl_name = CTL_UNNUMBERED,
1341 .procname = "highmem_is_dirtyable",
1342 .data = &vm_highmem_is_dirtyable,
1343 .maxlen = sizeof(vm_highmem_is_dirtyable),
1344 .mode = 0644,
1345 .proc_handler = &proc_dointvec_minmax,
1346 .strategy = &sysctl_intvec,
1347 .extra1 = &zero,
1348 .extra2 = &one,
1349 },
1350 #endif
1351 {
1352 .ctl_name = CTL_UNNUMBERED,
1353 .procname = "scan_unevictable_pages",
1354 .data = &scan_unevictable_pages,
1355 .maxlen = sizeof(scan_unevictable_pages),
1356 .mode = 0644,
1357 .proc_handler = &scan_unevictable_handler,
1358 },
1359 /*
1360 * NOTE: do not add new entries to this table unless you have read
1361 * Documentation/sysctl/ctl_unnumbered.txt
1362 */
1363 { .ctl_name = 0 }
1364 };
1365
1366 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1367 static struct ctl_table binfmt_misc_table[] = {
1368 { .ctl_name = 0 }
1369 };
1370 #endif
1371
1372 static struct ctl_table fs_table[] = {
1373 {
1374 .ctl_name = FS_NRINODE,
1375 .procname = "inode-nr",
1376 .data = &inodes_stat,
1377 .maxlen = 2*sizeof(int),
1378 .mode = 0444,
1379 .proc_handler = &proc_dointvec,
1380 },
1381 {
1382 .ctl_name = FS_STATINODE,
1383 .procname = "inode-state",
1384 .data = &inodes_stat,
1385 .maxlen = 7*sizeof(int),
1386 .mode = 0444,
1387 .proc_handler = &proc_dointvec,
1388 },
1389 {
1390 .procname = "file-nr",
1391 .data = &files_stat,
1392 .maxlen = 3*sizeof(int),
1393 .mode = 0444,
1394 .proc_handler = &proc_nr_files,
1395 },
1396 {
1397 .ctl_name = FS_MAXFILE,
1398 .procname = "file-max",
1399 .data = &files_stat.max_files,
1400 .maxlen = sizeof(int),
1401 .mode = 0644,
1402 .proc_handler = &proc_dointvec,
1403 },
1404 {
1405 .ctl_name = CTL_UNNUMBERED,
1406 .procname = "nr_open",
1407 .data = &sysctl_nr_open,
1408 .maxlen = sizeof(int),
1409 .mode = 0644,
1410 .proc_handler = &proc_dointvec_minmax,
1411 .extra1 = &sysctl_nr_open_min,
1412 .extra2 = &sysctl_nr_open_max,
1413 },
1414 {
1415 .ctl_name = FS_DENTRY,
1416 .procname = "dentry-state",
1417 .data = &dentry_stat,
1418 .maxlen = 6*sizeof(int),
1419 .mode = 0444,
1420 .proc_handler = &proc_dointvec,
1421 },
1422 {
1423 .ctl_name = FS_OVERFLOWUID,
1424 .procname = "overflowuid",
1425 .data = &fs_overflowuid,
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 {
1434 .ctl_name = FS_OVERFLOWGID,
1435 .procname = "overflowgid",
1436 .data = &fs_overflowgid,
1437 .maxlen = sizeof(int),
1438 .mode = 0644,
1439 .proc_handler = &proc_dointvec_minmax,
1440 .strategy = &sysctl_intvec,
1441 .extra1 = &minolduid,
1442 .extra2 = &maxolduid,
1443 },
1444 #ifdef CONFIG_FILE_LOCKING
1445 {
1446 .ctl_name = FS_LEASES,
1447 .procname = "leases-enable",
1448 .data = &leases_enable,
1449 .maxlen = sizeof(int),
1450 .mode = 0644,
1451 .proc_handler = &proc_dointvec,
1452 },
1453 #endif
1454 #ifdef CONFIG_DNOTIFY
1455 {
1456 .ctl_name = FS_DIR_NOTIFY,
1457 .procname = "dir-notify-enable",
1458 .data = &dir_notify_enable,
1459 .maxlen = sizeof(int),
1460 .mode = 0644,
1461 .proc_handler = &proc_dointvec,
1462 },
1463 #endif
1464 #ifdef CONFIG_MMU
1465 #ifdef CONFIG_FILE_LOCKING
1466 {
1467 .ctl_name = FS_LEASE_TIME,
1468 .procname = "lease-break-time",
1469 .data = &lease_break_time,
1470 .maxlen = sizeof(int),
1471 .mode = 0644,
1472 .proc_handler = &proc_dointvec,
1473 },
1474 #endif
1475 #ifdef CONFIG_AIO
1476 {
1477 .procname = "aio-nr",
1478 .data = &aio_nr,
1479 .maxlen = sizeof(aio_nr),
1480 .mode = 0444,
1481 .proc_handler = &proc_doulongvec_minmax,
1482 },
1483 {
1484 .procname = "aio-max-nr",
1485 .data = &aio_max_nr,
1486 .maxlen = sizeof(aio_max_nr),
1487 .mode = 0644,
1488 .proc_handler = &proc_doulongvec_minmax,
1489 },
1490 #endif /* CONFIG_AIO */
1491 #ifdef CONFIG_INOTIFY_USER
1492 {
1493 .ctl_name = FS_INOTIFY,
1494 .procname = "inotify",
1495 .mode = 0555,
1496 .child = inotify_table,
1497 },
1498 #endif
1499 #ifdef CONFIG_EPOLL
1500 {
1501 .procname = "epoll",
1502 .mode = 0555,
1503 .child = epoll_table,
1504 },
1505 #endif
1506 #endif
1507 {
1508 .ctl_name = KERN_SETUID_DUMPABLE,
1509 .procname = "suid_dumpable",
1510 .data = &suid_dumpable,
1511 .maxlen = sizeof(int),
1512 .mode = 0644,
1513 .proc_handler = &proc_dointvec_minmax,
1514 .strategy = &sysctl_intvec,
1515 .extra1 = &zero,
1516 .extra2 = &two,
1517 },
1518 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1519 {
1520 .ctl_name = CTL_UNNUMBERED,
1521 .procname = "binfmt_misc",
1522 .mode = 0555,
1523 .child = binfmt_misc_table,
1524 },
1525 #endif
1526 /*
1527 * NOTE: do not add new entries to this table unless you have read
1528 * Documentation/sysctl/ctl_unnumbered.txt
1529 */
1530 { .ctl_name = 0 }
1531 };
1532
1533 static struct ctl_table debug_table[] = {
1534 #if defined(CONFIG_X86) || defined(CONFIG_PPC)
1535 {
1536 .ctl_name = CTL_UNNUMBERED,
1537 .procname = "exception-trace",
1538 .data = &show_unhandled_signals,
1539 .maxlen = sizeof(int),
1540 .mode = 0644,
1541 .proc_handler = proc_dointvec
1542 },
1543 #endif
1544 { .ctl_name = 0 }
1545 };
1546
1547 static struct ctl_table dev_table[] = {
1548 { .ctl_name = 0 }
1549 };
1550
1551 static DEFINE_SPINLOCK(sysctl_lock);
1552
1553 /* called under sysctl_lock */
1554 static int use_table(struct ctl_table_header *p)
1555 {
1556 if (unlikely(p->unregistering))
1557 return 0;
1558 p->used++;
1559 return 1;
1560 }
1561
1562 /* called under sysctl_lock */
1563 static void unuse_table(struct ctl_table_header *p)
1564 {
1565 if (!--p->used)
1566 if (unlikely(p->unregistering))
1567 complete(p->unregistering);
1568 }
1569
1570 /* called under sysctl_lock, will reacquire if has to wait */
1571 static void start_unregistering(struct ctl_table_header *p)
1572 {
1573 /*
1574 * if p->used is 0, nobody will ever touch that entry again;
1575 * we'll eliminate all paths to it before dropping sysctl_lock
1576 */
1577 if (unlikely(p->used)) {
1578 struct completion wait;
1579 init_completion(&wait);
1580 p->unregistering = &wait;
1581 spin_unlock(&sysctl_lock);
1582 wait_for_completion(&wait);
1583 spin_lock(&sysctl_lock);
1584 } else {
1585 /* anything non-NULL; we'll never dereference it */
1586 p->unregistering = ERR_PTR(-EINVAL);
1587 }
1588 /*
1589 * do not remove from the list until nobody holds it; walking the
1590 * list in do_sysctl() relies on that.
1591 */
1592 list_del_init(&p->ctl_entry);
1593 }
1594
1595 void sysctl_head_get(struct ctl_table_header *head)
1596 {
1597 spin_lock(&sysctl_lock);
1598 head->count++;
1599 spin_unlock(&sysctl_lock);
1600 }
1601
1602 void sysctl_head_put(struct ctl_table_header *head)
1603 {
1604 spin_lock(&sysctl_lock);
1605 if (!--head->count)
1606 kfree(head);
1607 spin_unlock(&sysctl_lock);
1608 }
1609
1610 struct ctl_table_header *sysctl_head_grab(struct ctl_table_header *head)
1611 {
1612 if (!head)
1613 BUG();
1614 spin_lock(&sysctl_lock);
1615 if (!use_table(head))
1616 head = ERR_PTR(-ENOENT);
1617 spin_unlock(&sysctl_lock);
1618 return head;
1619 }
1620
1621 void sysctl_head_finish(struct ctl_table_header *head)
1622 {
1623 if (!head)
1624 return;
1625 spin_lock(&sysctl_lock);
1626 unuse_table(head);
1627 spin_unlock(&sysctl_lock);
1628 }
1629
1630 static struct ctl_table_set *
1631 lookup_header_set(struct ctl_table_root *root, struct nsproxy *namespaces)
1632 {
1633 struct ctl_table_set *set = &root->default_set;
1634 if (root->lookup)
1635 set = root->lookup(root, namespaces);
1636 return set;
1637 }
1638
1639 static struct list_head *
1640 lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces)
1641 {
1642 struct ctl_table_set *set = lookup_header_set(root, namespaces);
1643 return &set->list;
1644 }
1645
1646 struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces,
1647 struct ctl_table_header *prev)
1648 {
1649 struct ctl_table_root *root;
1650 struct list_head *header_list;
1651 struct ctl_table_header *head;
1652 struct list_head *tmp;
1653
1654 spin_lock(&sysctl_lock);
1655 if (prev) {
1656 head = prev;
1657 tmp = &prev->ctl_entry;
1658 unuse_table(prev);
1659 goto next;
1660 }
1661 tmp = &root_table_header.ctl_entry;
1662 for (;;) {
1663 head = list_entry(tmp, struct ctl_table_header, ctl_entry);
1664
1665 if (!use_table(head))
1666 goto next;
1667 spin_unlock(&sysctl_lock);
1668 return head;
1669 next:
1670 root = head->root;
1671 tmp = tmp->next;
1672 header_list = lookup_header_list(root, namespaces);
1673 if (tmp != header_list)
1674 continue;
1675
1676 do {
1677 root = list_entry(root->root_list.next,
1678 struct ctl_table_root, root_list);
1679 if (root == &sysctl_table_root)
1680 goto out;
1681 header_list = lookup_header_list(root, namespaces);
1682 } while (list_empty(header_list));
1683 tmp = header_list->next;
1684 }
1685 out:
1686 spin_unlock(&sysctl_lock);
1687 return NULL;
1688 }
1689
1690 struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev)
1691 {
1692 return __sysctl_head_next(current->nsproxy, prev);
1693 }
1694
1695 void register_sysctl_root(struct ctl_table_root *root)
1696 {
1697 spin_lock(&sysctl_lock);
1698 list_add_tail(&root->root_list, &sysctl_table_root.root_list);
1699 spin_unlock(&sysctl_lock);
1700 }
1701
1702 #ifdef CONFIG_SYSCTL_SYSCALL
1703 /* Perform the actual read/write of a sysctl table entry. */
1704 static int do_sysctl_strategy(struct ctl_table_root *root,
1705 struct ctl_table *table,
1706 void __user *oldval, size_t __user *oldlenp,
1707 void __user *newval, size_t newlen)
1708 {
1709 int op = 0, rc;
1710
1711 if (oldval)
1712 op |= MAY_READ;
1713 if (newval)
1714 op |= MAY_WRITE;
1715 if (sysctl_perm(root, table, op))
1716 return -EPERM;
1717
1718 if (table->strategy) {
1719 rc = table->strategy(table, oldval, oldlenp, newval, newlen);
1720 if (rc < 0)
1721 return rc;
1722 if (rc > 0)
1723 return 0;
1724 }
1725
1726 /* If there is no strategy routine, or if the strategy returns
1727 * zero, proceed with automatic r/w */
1728 if (table->data && table->maxlen) {
1729 rc = sysctl_data(table, oldval, oldlenp, newval, newlen);
1730 if (rc < 0)
1731 return rc;
1732 }
1733 return 0;
1734 }
1735
1736 static int parse_table(int __user *name, int nlen,
1737 void __user *oldval, size_t __user *oldlenp,
1738 void __user *newval, size_t newlen,
1739 struct ctl_table_root *root,
1740 struct ctl_table *table)
1741 {
1742 int n;
1743 repeat:
1744 if (!nlen)
1745 return -ENOTDIR;
1746 if (get_user(n, name))
1747 return -EFAULT;
1748 for ( ; table->ctl_name || table->procname; table++) {
1749 if (!table->ctl_name)
1750 continue;
1751 if (n == table->ctl_name) {
1752 int error;
1753 if (table->child) {
1754 if (sysctl_perm(root, table, MAY_EXEC))
1755 return -EPERM;
1756 name++;
1757 nlen--;
1758 table = table->child;
1759 goto repeat;
1760 }
1761 error = do_sysctl_strategy(root, table,
1762 oldval, oldlenp,
1763 newval, newlen);
1764 return error;
1765 }
1766 }
1767 return -ENOTDIR;
1768 }
1769
1770 int do_sysctl(int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp,
1771 void __user *newval, size_t newlen)
1772 {
1773 struct ctl_table_header *head;
1774 int error = -ENOTDIR;
1775
1776 if (nlen <= 0 || nlen >= CTL_MAXNAME)
1777 return -ENOTDIR;
1778 if (oldval) {
1779 int old_len;
1780 if (!oldlenp || get_user(old_len, oldlenp))
1781 return -EFAULT;
1782 }
1783
1784 for (head = sysctl_head_next(NULL); head;
1785 head = sysctl_head_next(head)) {
1786 error = parse_table(name, nlen, oldval, oldlenp,
1787 newval, newlen,
1788 head->root, head->ctl_table);
1789 if (error != -ENOTDIR) {
1790 sysctl_head_finish(head);
1791 break;
1792 }
1793 }
1794 return error;
1795 }
1796
1797 SYSCALL_DEFINE1(sysctl, struct __sysctl_args __user *, args)
1798 {
1799 struct __sysctl_args tmp;
1800 int error;
1801
1802 if (copy_from_user(&tmp, args, sizeof(tmp)))
1803 return -EFAULT;
1804
1805 error = deprecated_sysctl_warning(&tmp);
1806 if (error)
1807 goto out;
1808
1809 lock_kernel();
1810 error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp,
1811 tmp.newval, tmp.newlen);
1812 unlock_kernel();
1813 out:
1814 return error;
1815 }
1816 #endif /* CONFIG_SYSCTL_SYSCALL */
1817
1818 /*
1819 * sysctl_perm does NOT grant the superuser all rights automatically, because
1820 * some sysctl variables are readonly even to root.
1821 */
1822
1823 static int test_perm(int mode, int op)
1824 {
1825 if (!current_euid())
1826 mode >>= 6;
1827 else if (in_egroup_p(0))
1828 mode >>= 3;
1829 if ((op & ~mode & (MAY_READ|MAY_WRITE|MAY_EXEC)) == 0)
1830 return 0;
1831 return -EACCES;
1832 }
1833
1834 int sysctl_perm(struct ctl_table_root *root, struct ctl_table *table, int op)
1835 {
1836 int error;
1837 int mode;
1838
1839 error = security_sysctl(table, op & (MAY_READ | MAY_WRITE | MAY_EXEC));
1840 if (error)
1841 return error;
1842
1843 if (root->permissions)
1844 mode = root->permissions(root, current->nsproxy, table);
1845 else
1846 mode = table->mode;
1847
1848 return test_perm(mode, op);
1849 }
1850
1851 static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table)
1852 {
1853 for (; table->ctl_name || table->procname; table++) {
1854 table->parent = parent;
1855 if (table->child)
1856 sysctl_set_parent(table, table->child);
1857 }
1858 }
1859
1860 static __init int sysctl_init(void)
1861 {
1862 sysctl_set_parent(NULL, root_table);
1863 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK
1864 {
1865 int err;
1866 err = sysctl_check_table(current->nsproxy, root_table);
1867 }
1868 #endif
1869 return 0;
1870 }
1871
1872 core_initcall(sysctl_init);
1873
1874 static struct ctl_table *is_branch_in(struct ctl_table *branch,
1875 struct ctl_table *table)
1876 {
1877 struct ctl_table *p;
1878 const char *s = branch->procname;
1879
1880 /* branch should have named subdirectory as its first element */
1881 if (!s || !branch->child)
1882 return NULL;
1883
1884 /* ... and nothing else */
1885 if (branch[1].procname || branch[1].ctl_name)
1886 return NULL;
1887
1888 /* table should contain subdirectory with the same name */
1889 for (p = table; p->procname || p->ctl_name; p++) {
1890 if (!p->child)
1891 continue;
1892 if (p->procname && strcmp(p->procname, s) == 0)
1893 return p;
1894 }
1895 return NULL;
1896 }
1897
1898 /* see if attaching q to p would be an improvement */
1899 static void try_attach(struct ctl_table_header *p, struct ctl_table_header *q)
1900 {
1901 struct ctl_table *to = p->ctl_table, *by = q->ctl_table;
1902 struct ctl_table *next;
1903 int is_better = 0;
1904 int not_in_parent = !p->attached_by;
1905
1906 while ((next = is_branch_in(by, to)) != NULL) {
1907 if (by == q->attached_by)
1908 is_better = 1;
1909 if (to == p->attached_by)
1910 not_in_parent = 1;
1911 by = by->child;
1912 to = next->child;
1913 }
1914
1915 if (is_better && not_in_parent) {
1916 q->attached_by = by;
1917 q->attached_to = to;
1918 q->parent = p;
1919 }
1920 }
1921
1922 /**
1923 * __register_sysctl_paths - register a sysctl hierarchy
1924 * @root: List of sysctl headers to register on
1925 * @namespaces: Data to compute which lists of sysctl entries are visible
1926 * @path: The path to the directory the sysctl table is in.
1927 * @table: the top-level table structure
1928 *
1929 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1930 * array. A completely 0 filled entry terminates the table.
1931 *
1932 * The members of the &struct ctl_table structure are used as follows:
1933 *
1934 * ctl_name - This is the numeric sysctl value used by sysctl(2). The number
1935 * must be unique within that level of sysctl
1936 *
1937 * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1938 * enter a sysctl file
1939 *
1940 * data - a pointer to data for use by proc_handler
1941 *
1942 * maxlen - the maximum size in bytes of the data
1943 *
1944 * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1945 *
1946 * child - a pointer to the child sysctl table if this entry is a directory, or
1947 * %NULL.
1948 *
1949 * proc_handler - the text handler routine (described below)
1950 *
1951 * strategy - the strategy routine (described below)
1952 *
1953 * de - for internal use by the sysctl routines
1954 *
1955 * extra1, extra2 - extra pointers usable by the proc handler routines
1956 *
1957 * Leaf nodes in the sysctl tree will be represented by a single file
1958 * under /proc; non-leaf nodes will be represented by directories.
1959 *
1960 * sysctl(2) can automatically manage read and write requests through
1961 * the sysctl table. The data and maxlen fields of the ctl_table
1962 * struct enable minimal validation of the values being written to be
1963 * performed, and the mode field allows minimal authentication.
1964 *
1965 * More sophisticated management can be enabled by the provision of a
1966 * strategy routine with the table entry. This will be called before
1967 * any automatic read or write of the data is performed.
1968 *
1969 * The strategy routine may return
1970 *
1971 * < 0 - Error occurred (error is passed to user process)
1972 *
1973 * 0 - OK - proceed with automatic read or write.
1974 *
1975 * > 0 - OK - read or write has been done by the strategy routine, so
1976 * return immediately.
1977 *
1978 * There must be a proc_handler routine for any terminal nodes
1979 * mirrored under /proc/sys (non-terminals are handled by a built-in
1980 * directory handler). Several default handlers are available to
1981 * cover common cases -
1982 *
1983 * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
1984 * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(),
1985 * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
1986 *
1987 * It is the handler's job to read the input buffer from user memory
1988 * and process it. The handler should return 0 on success.
1989 *
1990 * This routine returns %NULL on a failure to register, and a pointer
1991 * to the table header on success.
1992 */
1993 struct ctl_table_header *__register_sysctl_paths(
1994 struct ctl_table_root *root,
1995 struct nsproxy *namespaces,
1996 const struct ctl_path *path, struct ctl_table *table)
1997 {
1998 struct ctl_table_header *header;
1999 struct ctl_table *new, **prevp;
2000 unsigned int n, npath;
2001 struct ctl_table_set *set;
2002
2003 /* Count the path components */
2004 for (npath = 0; path[npath].ctl_name || path[npath].procname; ++npath)
2005 ;
2006
2007 /*
2008 * For each path component, allocate a 2-element ctl_table array.
2009 * The first array element will be filled with the sysctl entry
2010 * for this, the second will be the sentinel (ctl_name == 0).
2011 *
2012 * We allocate everything in one go so that we don't have to
2013 * worry about freeing additional memory in unregister_sysctl_table.
2014 */
2015 header = kzalloc(sizeof(struct ctl_table_header) +
2016 (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL);
2017 if (!header)
2018 return NULL;
2019
2020 new = (struct ctl_table *) (header + 1);
2021
2022 /* Now connect the dots */
2023 prevp = &header->ctl_table;
2024 for (n = 0; n < npath; ++n, ++path) {
2025 /* Copy the procname */
2026 new->procname = path->procname;
2027 new->ctl_name = path->ctl_name;
2028 new->mode = 0555;
2029
2030 *prevp = new;
2031 prevp = &new->child;
2032
2033 new += 2;
2034 }
2035 *prevp = table;
2036 header->ctl_table_arg = table;
2037
2038 INIT_LIST_HEAD(&header->ctl_entry);
2039 header->used = 0;
2040 header->unregistering = NULL;
2041 header->root = root;
2042 sysctl_set_parent(NULL, header->ctl_table);
2043 header->count = 1;
2044 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK
2045 if (sysctl_check_table(namespaces, header->ctl_table)) {
2046 kfree(header);
2047 return NULL;
2048 }
2049 #endif
2050 spin_lock(&sysctl_lock);
2051 header->set = lookup_header_set(root, namespaces);
2052 header->attached_by = header->ctl_table;
2053 header->attached_to = root_table;
2054 header->parent = &root_table_header;
2055 for (set = header->set; set; set = set->parent) {
2056 struct ctl_table_header *p;
2057 list_for_each_entry(p, &set->list, ctl_entry) {
2058 if (p->unregistering)
2059 continue;
2060 try_attach(p, header);
2061 }
2062 }
2063 header->parent->count++;
2064 list_add_tail(&header->ctl_entry, &header->set->list);
2065 spin_unlock(&sysctl_lock);
2066
2067 return header;
2068 }
2069
2070 /**
2071 * register_sysctl_table_path - register a sysctl table hierarchy
2072 * @path: The path to the directory the sysctl table is in.
2073 * @table: the top-level table structure
2074 *
2075 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
2076 * array. A completely 0 filled entry terminates the table.
2077 *
2078 * See __register_sysctl_paths for more details.
2079 */
2080 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
2081 struct ctl_table *table)
2082 {
2083 return __register_sysctl_paths(&sysctl_table_root, current->nsproxy,
2084 path, table);
2085 }
2086
2087 /**
2088 * register_sysctl_table - register a sysctl table hierarchy
2089 * @table: the top-level table structure
2090 *
2091 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
2092 * array. A completely 0 filled entry terminates the table.
2093 *
2094 * See register_sysctl_paths for more details.
2095 */
2096 struct ctl_table_header *register_sysctl_table(struct ctl_table *table)
2097 {
2098 static const struct ctl_path null_path[] = { {} };
2099
2100 return register_sysctl_paths(null_path, table);
2101 }
2102
2103 /**
2104 * unregister_sysctl_table - unregister a sysctl table hierarchy
2105 * @header: the header returned from register_sysctl_table
2106 *
2107 * Unregisters the sysctl table and all children. proc entries may not
2108 * actually be removed until they are no longer used by anyone.
2109 */
2110 void unregister_sysctl_table(struct ctl_table_header * header)
2111 {
2112 might_sleep();
2113
2114 if (header == NULL)
2115 return;
2116
2117 spin_lock(&sysctl_lock);
2118 start_unregistering(header);
2119 if (!--header->parent->count) {
2120 WARN_ON(1);
2121 kfree(header->parent);
2122 }
2123 if (!--header->count)
2124 kfree(header);
2125 spin_unlock(&sysctl_lock);
2126 }
2127
2128 int sysctl_is_seen(struct ctl_table_header *p)
2129 {
2130 struct ctl_table_set *set = p->set;
2131 int res;
2132 spin_lock(&sysctl_lock);
2133 if (p->unregistering)
2134 res = 0;
2135 else if (!set->is_seen)
2136 res = 1;
2137 else
2138 res = set->is_seen(set);
2139 spin_unlock(&sysctl_lock);
2140 return res;
2141 }
2142
2143 void setup_sysctl_set(struct ctl_table_set *p,
2144 struct ctl_table_set *parent,
2145 int (*is_seen)(struct ctl_table_set *))
2146 {
2147 INIT_LIST_HEAD(&p->list);
2148 p->parent = parent ? parent : &sysctl_table_root.default_set;
2149 p->is_seen = is_seen;
2150 }
2151
2152 #else /* !CONFIG_SYSCTL */
2153 struct ctl_table_header *register_sysctl_table(struct ctl_table * table)
2154 {
2155 return NULL;
2156 }
2157
2158 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
2159 struct ctl_table *table)
2160 {
2161 return NULL;
2162 }
2163
2164 void unregister_sysctl_table(struct ctl_table_header * table)
2165 {
2166 }
2167
2168 void setup_sysctl_set(struct ctl_table_set *p,
2169 struct ctl_table_set *parent,
2170 int (*is_seen)(struct ctl_table_set *))
2171 {
2172 }
2173
2174 void sysctl_head_put(struct ctl_table_header *head)
2175 {
2176 }
2177
2178 #endif /* CONFIG_SYSCTL */
2179
2180 /*
2181 * /proc/sys support
2182 */
2183
2184 #ifdef CONFIG_PROC_SYSCTL
2185
2186 static int _proc_do_string(void* data, int maxlen, int write,
2187 struct file *filp, void __user *buffer,
2188 size_t *lenp, loff_t *ppos)
2189 {
2190 size_t len;
2191 char __user *p;
2192 char c;
2193
2194 if (!data || !maxlen || !*lenp) {
2195 *lenp = 0;
2196 return 0;
2197 }
2198
2199 if (write) {
2200 len = 0;
2201 p = buffer;
2202 while (len < *lenp) {
2203 if (get_user(c, p++))
2204 return -EFAULT;
2205 if (c == 0 || c == '\n')
2206 break;
2207 len++;
2208 }
2209 if (len >= maxlen)
2210 len = maxlen-1;
2211 if(copy_from_user(data, buffer, len))
2212 return -EFAULT;
2213 ((char *) data)[len] = 0;
2214 *ppos += *lenp;
2215 } else {
2216 len = strlen(data);
2217 if (len > maxlen)
2218 len = maxlen;
2219
2220 if (*ppos > len) {
2221 *lenp = 0;
2222 return 0;
2223 }
2224
2225 data += *ppos;
2226 len -= *ppos;
2227
2228 if (len > *lenp)
2229 len = *lenp;
2230 if (len)
2231 if(copy_to_user(buffer, data, len))
2232 return -EFAULT;
2233 if (len < *lenp) {
2234 if(put_user('\n', ((char __user *) buffer) + len))
2235 return -EFAULT;
2236 len++;
2237 }
2238 *lenp = len;
2239 *ppos += len;
2240 }
2241 return 0;
2242 }
2243
2244 /**
2245 * proc_dostring - read a string sysctl
2246 * @table: the sysctl table
2247 * @write: %TRUE if this is a write to the sysctl file
2248 * @filp: the file structure
2249 * @buffer: the user buffer
2250 * @lenp: the size of the user buffer
2251 * @ppos: file position
2252 *
2253 * Reads/writes a string from/to the user buffer. If the kernel
2254 * buffer provided is not large enough to hold the string, the
2255 * string is truncated. The copied string is %NULL-terminated.
2256 * If the string is being read by the user process, it is copied
2257 * and a newline '\n' is added. It is truncated if the buffer is
2258 * not large enough.
2259 *
2260 * Returns 0 on success.
2261 */
2262 int proc_dostring(struct ctl_table *table, int write, struct file *filp,
2263 void __user *buffer, size_t *lenp, loff_t *ppos)
2264 {
2265 return _proc_do_string(table->data, table->maxlen, write, filp,
2266 buffer, lenp, ppos);
2267 }
2268
2269
2270 static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp,
2271 int *valp,
2272 int write, void *data)
2273 {
2274 if (write) {
2275 *valp = *negp ? -*lvalp : *lvalp;
2276 } else {
2277 int val = *valp;
2278 if (val < 0) {
2279 *negp = -1;
2280 *lvalp = (unsigned long)-val;
2281 } else {
2282 *negp = 0;
2283 *lvalp = (unsigned long)val;
2284 }
2285 }
2286 return 0;
2287 }
2288
2289 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
2290 int write, struct file *filp, void __user *buffer,
2291 size_t *lenp, loff_t *ppos,
2292 int (*conv)(int *negp, unsigned long *lvalp, int *valp,
2293 int write, void *data),
2294 void *data)
2295 {
2296 #define TMPBUFLEN 21
2297 int *i, vleft, first = 1, neg;
2298 unsigned long lval;
2299 size_t left, len;
2300
2301 char buf[TMPBUFLEN], *p;
2302 char __user *s = buffer;
2303
2304 if (!tbl_data || !table->maxlen || !*lenp ||
2305 (*ppos && !write)) {
2306 *lenp = 0;
2307 return 0;
2308 }
2309
2310 i = (int *) tbl_data;
2311 vleft = table->maxlen / sizeof(*i);
2312 left = *lenp;
2313
2314 if (!conv)
2315 conv = do_proc_dointvec_conv;
2316
2317 for (; left && vleft--; i++, first=0) {
2318 if (write) {
2319 while (left) {
2320 char c;
2321 if (get_user(c, s))
2322 return -EFAULT;
2323 if (!isspace(c))
2324 break;
2325 left--;
2326 s++;
2327 }
2328 if (!left)
2329 break;
2330 neg = 0;
2331 len = left;
2332 if (len > sizeof(buf) - 1)
2333 len = sizeof(buf) - 1;
2334 if (copy_from_user(buf, s, len))
2335 return -EFAULT;
2336 buf[len] = 0;
2337 p = buf;
2338 if (*p == '-' && left > 1) {
2339 neg = 1;
2340 p++;
2341 }
2342 if (*p < '0' || *p > '9')
2343 break;
2344
2345 lval = simple_strtoul(p, &p, 0);
2346
2347 len = p-buf;
2348 if ((len < left) && *p && !isspace(*p))
2349 break;
2350 s += len;
2351 left -= len;
2352
2353 if (conv(&neg, &lval, i, 1, data))
2354 break;
2355 } else {
2356 p = buf;
2357 if (!first)
2358 *p++ = '\t';
2359
2360 if (conv(&neg, &lval, i, 0, data))
2361 break;
2362
2363 sprintf(p, "%s%lu", neg ? "-" : "", lval);
2364 len = strlen(buf);
2365 if (len > left)
2366 len = left;
2367 if(copy_to_user(s, buf, len))
2368 return -EFAULT;
2369 left -= len;
2370 s += len;
2371 }
2372 }
2373
2374 if (!write && !first && left) {
2375 if(put_user('\n', s))
2376 return -EFAULT;
2377 left--, s++;
2378 }
2379 if (write) {
2380 while (left) {
2381 char c;
2382 if (get_user(c, s++))
2383 return -EFAULT;
2384 if (!isspace(c))
2385 break;
2386 left--;
2387 }
2388 }
2389 if (write && first)
2390 return -EINVAL;
2391 *lenp -= left;
2392 *ppos += *lenp;
2393 return 0;
2394 #undef TMPBUFLEN
2395 }
2396
2397 static int do_proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2398 void __user *buffer, size_t *lenp, loff_t *ppos,
2399 int (*conv)(int *negp, unsigned long *lvalp, int *valp,
2400 int write, void *data),
2401 void *data)
2402 {
2403 return __do_proc_dointvec(table->data, table, write, filp,
2404 buffer, lenp, ppos, conv, data);
2405 }
2406
2407 /**
2408 * proc_dointvec - read a vector of integers
2409 * @table: the sysctl table
2410 * @write: %TRUE if this is a write to the sysctl file
2411 * @filp: the file structure
2412 * @buffer: the user buffer
2413 * @lenp: the size of the user buffer
2414 * @ppos: file position
2415 *
2416 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2417 * values from/to the user buffer, treated as an ASCII string.
2418 *
2419 * Returns 0 on success.
2420 */
2421 int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2422 void __user *buffer, size_t *lenp, loff_t *ppos)
2423 {
2424 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2425 NULL,NULL);
2426 }
2427
2428 /*
2429 * Taint values can only be increased
2430 * This means we can safely use a temporary.
2431 */
2432 static int proc_taint(struct ctl_table *table, int write, struct file *filp,
2433 void __user *buffer, size_t *lenp, loff_t *ppos)
2434 {
2435 struct ctl_table t;
2436 unsigned long tmptaint = get_taint();
2437 int err;
2438
2439 if (write && !capable(CAP_SYS_ADMIN))
2440 return -EPERM;
2441
2442 t = *table;
2443 t.data = &tmptaint;
2444 err = proc_doulongvec_minmax(&t, write, filp, buffer, lenp, ppos);
2445 if (err < 0)
2446 return err;
2447
2448 if (write) {
2449 /*
2450 * Poor man's atomic or. Not worth adding a primitive
2451 * to everyone's atomic.h for this
2452 */
2453 int i;
2454 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2455 if ((tmptaint >> i) & 1)
2456 add_taint(i);
2457 }
2458 }
2459
2460 return err;
2461 }
2462
2463 struct do_proc_dointvec_minmax_conv_param {
2464 int *min;
2465 int *max;
2466 };
2467
2468 static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp,
2469 int *valp,
2470 int write, void *data)
2471 {
2472 struct do_proc_dointvec_minmax_conv_param *param = data;
2473 if (write) {
2474 int val = *negp ? -*lvalp : *lvalp;
2475 if ((param->min && *param->min > val) ||
2476 (param->max && *param->max < val))
2477 return -EINVAL;
2478 *valp = val;
2479 } else {
2480 int val = *valp;
2481 if (val < 0) {
2482 *negp = -1;
2483 *lvalp = (unsigned long)-val;
2484 } else {
2485 *negp = 0;
2486 *lvalp = (unsigned long)val;
2487 }
2488 }
2489 return 0;
2490 }
2491
2492 /**
2493 * proc_dointvec_minmax - read a vector of integers with min/max values
2494 * @table: the sysctl table
2495 * @write: %TRUE if this is a write to the sysctl file
2496 * @filp: the file structure
2497 * @buffer: the user buffer
2498 * @lenp: the size of the user buffer
2499 * @ppos: file position
2500 *
2501 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2502 * values from/to the user buffer, treated as an ASCII string.
2503 *
2504 * This routine will ensure the values are within the range specified by
2505 * table->extra1 (min) and table->extra2 (max).
2506 *
2507 * Returns 0 on success.
2508 */
2509 int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
2510 void __user *buffer, size_t *lenp, loff_t *ppos)
2511 {
2512 struct do_proc_dointvec_minmax_conv_param param = {
2513 .min = (int *) table->extra1,
2514 .max = (int *) table->extra2,
2515 };
2516 return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2517 do_proc_dointvec_minmax_conv, &param);
2518 }
2519
2520 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2521 struct file *filp,
2522 void __user *buffer,
2523 size_t *lenp, loff_t *ppos,
2524 unsigned long convmul,
2525 unsigned long convdiv)
2526 {
2527 #define TMPBUFLEN 21
2528 unsigned long *i, *min, *max, val;
2529 int vleft, first=1, neg;
2530 size_t len, left;
2531 char buf[TMPBUFLEN], *p;
2532 char __user *s = buffer;
2533
2534 if (!data || !table->maxlen || !*lenp ||
2535 (*ppos && !write)) {
2536 *lenp = 0;
2537 return 0;
2538 }
2539
2540 i = (unsigned long *) data;
2541 min = (unsigned long *) table->extra1;
2542 max = (unsigned long *) table->extra2;
2543 vleft = table->maxlen / sizeof(unsigned long);
2544 left = *lenp;
2545
2546 for (; left && vleft--; i++, min++, max++, first=0) {
2547 if (write) {
2548 while (left) {
2549 char c;
2550 if (get_user(c, s))
2551 return -EFAULT;
2552 if (!isspace(c))
2553 break;
2554 left--;
2555 s++;
2556 }
2557 if (!left)
2558 break;
2559 neg = 0;
2560 len = left;
2561 if (len > TMPBUFLEN-1)
2562 len = TMPBUFLEN-1;
2563 if (copy_from_user(buf, s, len))
2564 return -EFAULT;
2565 buf[len] = 0;
2566 p = buf;
2567 if (*p == '-' && left > 1) {
2568 neg = 1;
2569 p++;
2570 }
2571 if (*p < '0' || *p > '9')
2572 break;
2573 val = simple_strtoul(p, &p, 0) * convmul / convdiv ;
2574 len = p-buf;
2575 if ((len < left) && *p && !isspace(*p))
2576 break;
2577 if (neg)
2578 val = -val;
2579 s += len;
2580 left -= len;
2581
2582 if(neg)
2583 continue;
2584 if ((min && val < *min) || (max && val > *max))
2585 continue;
2586 *i = val;
2587 } else {
2588 p = buf;
2589 if (!first)
2590 *p++ = '\t';
2591 sprintf(p, "%lu", convdiv * (*i) / convmul);
2592 len = strlen(buf);
2593 if (len > left)
2594 len = left;
2595 if(copy_to_user(s, buf, len))
2596 return -EFAULT;
2597 left -= len;
2598 s += len;
2599 }
2600 }
2601
2602 if (!write && !first && left) {
2603 if(put_user('\n', s))
2604 return -EFAULT;
2605 left--, s++;
2606 }
2607 if (write) {
2608 while (left) {
2609 char c;
2610 if (get_user(c, s++))
2611 return -EFAULT;
2612 if (!isspace(c))
2613 break;
2614 left--;
2615 }
2616 }
2617 if (write && first)
2618 return -EINVAL;
2619 *lenp -= left;
2620 *ppos += *lenp;
2621 return 0;
2622 #undef TMPBUFLEN
2623 }
2624
2625 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2626 struct file *filp,
2627 void __user *buffer,
2628 size_t *lenp, loff_t *ppos,
2629 unsigned long convmul,
2630 unsigned long convdiv)
2631 {
2632 return __do_proc_doulongvec_minmax(table->data, table, write,
2633 filp, buffer, lenp, ppos, convmul, convdiv);
2634 }
2635
2636 /**
2637 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2638 * @table: the sysctl table
2639 * @write: %TRUE if this is a write to the sysctl file
2640 * @filp: the file structure
2641 * @buffer: the user buffer
2642 * @lenp: the size of the user buffer
2643 * @ppos: file position
2644 *
2645 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2646 * values from/to the user buffer, treated as an ASCII string.
2647 *
2648 * This routine will ensure the values are within the range specified by
2649 * table->extra1 (min) and table->extra2 (max).
2650 *
2651 * Returns 0 on success.
2652 */
2653 int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
2654 void __user *buffer, size_t *lenp, loff_t *ppos)
2655 {
2656 return do_proc_doulongvec_minmax(table, write, filp, buffer, lenp, ppos, 1l, 1l);
2657 }
2658
2659 /**
2660 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2661 * @table: the sysctl table
2662 * @write: %TRUE if this is a write to the sysctl file
2663 * @filp: the file structure
2664 * @buffer: the user buffer
2665 * @lenp: the size of the user buffer
2666 * @ppos: file position
2667 *
2668 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2669 * values from/to the user buffer, treated as an ASCII string. The values
2670 * are treated as milliseconds, and converted to jiffies when they are stored.
2671 *
2672 * This routine will ensure the values are within the range specified by
2673 * table->extra1 (min) and table->extra2 (max).
2674 *
2675 * Returns 0 on success.
2676 */
2677 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2678 struct file *filp,
2679 void __user *buffer,
2680 size_t *lenp, loff_t *ppos)
2681 {
2682 return do_proc_doulongvec_minmax(table, write, filp, buffer,
2683 lenp, ppos, HZ, 1000l);
2684 }
2685
2686
2687 static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp,
2688 int *valp,
2689 int write, void *data)
2690 {
2691 if (write) {
2692 if (*lvalp > LONG_MAX / HZ)
2693 return 1;
2694 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2695 } else {
2696 int val = *valp;
2697 unsigned long lval;
2698 if (val < 0) {
2699 *negp = -1;
2700 lval = (unsigned long)-val;
2701 } else {
2702 *negp = 0;
2703 lval = (unsigned long)val;
2704 }
2705 *lvalp = lval / HZ;
2706 }
2707 return 0;
2708 }
2709
2710 static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp,
2711 int *valp,
2712 int write, void *data)
2713 {
2714 if (write) {
2715 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2716 return 1;
2717 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2718 } else {
2719 int val = *valp;
2720 unsigned long lval;
2721 if (val < 0) {
2722 *negp = -1;
2723 lval = (unsigned long)-val;
2724 } else {
2725 *negp = 0;
2726 lval = (unsigned long)val;
2727 }
2728 *lvalp = jiffies_to_clock_t(lval);
2729 }
2730 return 0;
2731 }
2732
2733 static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp,
2734 int *valp,
2735 int write, void *data)
2736 {
2737 if (write) {
2738 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2739 } else {
2740 int val = *valp;
2741 unsigned long lval;
2742 if (val < 0) {
2743 *negp = -1;
2744 lval = (unsigned long)-val;
2745 } else {
2746 *negp = 0;
2747 lval = (unsigned long)val;
2748 }
2749 *lvalp = jiffies_to_msecs(lval);
2750 }
2751 return 0;
2752 }
2753
2754 /**
2755 * proc_dointvec_jiffies - read a vector of integers as seconds
2756 * @table: the sysctl table
2757 * @write: %TRUE if this is a write to the sysctl file
2758 * @filp: the file structure
2759 * @buffer: the user buffer
2760 * @lenp: the size of the user buffer
2761 * @ppos: file position
2762 *
2763 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2764 * values from/to the user buffer, treated as an ASCII string.
2765 * The values read are assumed to be in seconds, and are converted into
2766 * jiffies.
2767 *
2768 * Returns 0 on success.
2769 */
2770 int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
2771 void __user *buffer, size_t *lenp, loff_t *ppos)
2772 {
2773 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2774 do_proc_dointvec_jiffies_conv,NULL);
2775 }
2776
2777 /**
2778 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2779 * @table: the sysctl table
2780 * @write: %TRUE if this is a write to the sysctl file
2781 * @filp: the file structure
2782 * @buffer: the user buffer
2783 * @lenp: the size of the user buffer
2784 * @ppos: pointer to the file position
2785 *
2786 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2787 * values from/to the user buffer, treated as an ASCII string.
2788 * The values read are assumed to be in 1/USER_HZ seconds, and
2789 * are converted into jiffies.
2790 *
2791 * Returns 0 on success.
2792 */
2793 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
2794 void __user *buffer, size_t *lenp, loff_t *ppos)
2795 {
2796 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2797 do_proc_dointvec_userhz_jiffies_conv,NULL);
2798 }
2799
2800 /**
2801 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2802 * @table: the sysctl table
2803 * @write: %TRUE if this is a write to the sysctl file
2804 * @filp: the file structure
2805 * @buffer: the user buffer
2806 * @lenp: the size of the user buffer
2807 * @ppos: file position
2808 * @ppos: the current position in the file
2809 *
2810 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2811 * values from/to the user buffer, treated as an ASCII string.
2812 * The values read are assumed to be in 1/1000 seconds, and
2813 * are converted into jiffies.
2814 *
2815 * Returns 0 on success.
2816 */
2817 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
2818 void __user *buffer, size_t *lenp, loff_t *ppos)
2819 {
2820 return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2821 do_proc_dointvec_ms_jiffies_conv, NULL);
2822 }
2823
2824 static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
2825 void __user *buffer, size_t *lenp, loff_t *ppos)
2826 {
2827 struct pid *new_pid;
2828 pid_t tmp;
2829 int r;
2830
2831 tmp = pid_vnr(cad_pid);
2832
2833 r = __do_proc_dointvec(&tmp, table, write, filp, buffer,
2834 lenp, ppos, NULL, NULL);
2835 if (r || !write)
2836 return r;
2837
2838 new_pid = find_get_pid(tmp);
2839 if (!new_pid)
2840 return -ESRCH;
2841
2842 put_pid(xchg(&cad_pid, new_pid));
2843 return 0;
2844 }
2845
2846 #else /* CONFIG_PROC_FS */
2847
2848 int proc_dostring(struct ctl_table *table, int write, struct file *filp,
2849 void __user *buffer, size_t *lenp, loff_t *ppos)
2850 {
2851 return -ENOSYS;
2852 }
2853
2854 int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2855 void __user *buffer, size_t *lenp, loff_t *ppos)
2856 {
2857 return -ENOSYS;
2858 }
2859
2860 int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
2861 void __user *buffer, size_t *lenp, loff_t *ppos)
2862 {
2863 return -ENOSYS;
2864 }
2865
2866 int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
2867 void __user *buffer, size_t *lenp, loff_t *ppos)
2868 {
2869 return -ENOSYS;
2870 }
2871
2872 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
2873 void __user *buffer, size_t *lenp, loff_t *ppos)
2874 {
2875 return -ENOSYS;
2876 }
2877
2878 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
2879 void __user *buffer, size_t *lenp, loff_t *ppos)
2880 {
2881 return -ENOSYS;
2882 }
2883
2884 int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
2885 void __user *buffer, size_t *lenp, loff_t *ppos)
2886 {
2887 return -ENOSYS;
2888 }
2889
2890 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2891 struct file *filp,
2892 void __user *buffer,
2893 size_t *lenp, loff_t *ppos)
2894 {
2895 return -ENOSYS;
2896 }
2897
2898
2899 #endif /* CONFIG_PROC_FS */
2900
2901
2902 #ifdef CONFIG_SYSCTL_SYSCALL
2903 /*
2904 * General sysctl support routines
2905 */
2906
2907 /* The generic sysctl data routine (used if no strategy routine supplied) */
2908 int sysctl_data(struct ctl_table *table,
2909 void __user *oldval, size_t __user *oldlenp,
2910 void __user *newval, size_t newlen)
2911 {
2912 size_t len;
2913
2914 /* Get out of I don't have a variable */
2915 if (!table->data || !table->maxlen)
2916 return -ENOTDIR;
2917
2918 if (oldval && oldlenp) {
2919 if (get_user(len, oldlenp))
2920 return -EFAULT;
2921 if (len) {
2922 if (len > table->maxlen)
2923 len = table->maxlen;
2924 if (copy_to_user(oldval, table->data, len))
2925 return -EFAULT;
2926 if (put_user(len, oldlenp))
2927 return -EFAULT;
2928 }
2929 }
2930
2931 if (newval && newlen) {
2932 if (newlen > table->maxlen)
2933 newlen = table->maxlen;
2934
2935 if (copy_from_user(table->data, newval, newlen))
2936 return -EFAULT;
2937 }
2938 return 1;
2939 }
2940
2941 /* The generic string strategy routine: */
2942 int sysctl_string(struct ctl_table *table,
2943 void __user *oldval, size_t __user *oldlenp,
2944 void __user *newval, size_t newlen)
2945 {
2946 if (!table->data || !table->maxlen)
2947 return -ENOTDIR;
2948
2949 if (oldval && oldlenp) {
2950 size_t bufsize;
2951 if (get_user(bufsize, oldlenp))
2952 return -EFAULT;
2953 if (bufsize) {
2954 size_t len = strlen(table->data), copied;
2955
2956 /* This shouldn't trigger for a well-formed sysctl */
2957 if (len > table->maxlen)
2958 len = table->maxlen;
2959
2960 /* Copy up to a max of bufsize-1 bytes of the string */
2961 copied = (len >= bufsize) ? bufsize - 1 : len;
2962
2963 if (copy_to_user(oldval, table->data, copied) ||
2964 put_user(0, (char __user *)(oldval + copied)))
2965 return -EFAULT;
2966 if (put_user(len, oldlenp))
2967 return -EFAULT;
2968 }
2969 }
2970 if (newval && newlen) {
2971 size_t len = newlen;
2972 if (len > table->maxlen)
2973 len = table->maxlen;
2974 if(copy_from_user(table->data, newval, len))
2975 return -EFAULT;
2976 if (len == table->maxlen)
2977 len--;
2978 ((char *) table->data)[len] = 0;
2979 }
2980 return 1;
2981 }
2982
2983 /*
2984 * This function makes sure that all of the integers in the vector
2985 * are between the minimum and maximum values given in the arrays
2986 * table->extra1 and table->extra2, respectively.
2987 */
2988 int sysctl_intvec(struct ctl_table *table,
2989 void __user *oldval, size_t __user *oldlenp,
2990 void __user *newval, size_t newlen)
2991 {
2992
2993 if (newval && newlen) {
2994 int __user *vec = (int __user *) newval;
2995 int *min = (int *) table->extra1;
2996 int *max = (int *) table->extra2;
2997 size_t length;
2998 int i;
2999
3000 if (newlen % sizeof(int) != 0)
3001 return -EINVAL;
3002
3003 if (!table->extra1 && !table->extra2)
3004 return 0;
3005
3006 if (newlen > table->maxlen)
3007 newlen = table->maxlen;
3008 length = newlen / sizeof(int);
3009
3010 for (i = 0; i < length; i++) {
3011 int value;
3012 if (get_user(value, vec + i))
3013 return -EFAULT;
3014 if (min && value < min[i])
3015 return -EINVAL;
3016 if (max && value > max[i])
3017 return -EINVAL;
3018 }
3019 }
3020 return 0;
3021 }
3022
3023 /* Strategy function to convert jiffies to seconds */
3024 int sysctl_jiffies(struct ctl_table *table,
3025 void __user *oldval, size_t __user *oldlenp,
3026 void __user *newval, size_t newlen)
3027 {
3028 if (oldval && oldlenp) {
3029 size_t olen;
3030
3031 if (get_user(olen, oldlenp))
3032 return -EFAULT;
3033 if (olen) {
3034 int val;
3035
3036 if (olen < sizeof(int))
3037 return -EINVAL;
3038
3039 val = *(int *)(table->data) / HZ;
3040 if (put_user(val, (int __user *)oldval))
3041 return -EFAULT;
3042 if (put_user(sizeof(int), oldlenp))
3043 return -EFAULT;
3044 }
3045 }
3046 if (newval && newlen) {
3047 int new;
3048 if (newlen != sizeof(int))
3049 return -EINVAL;
3050 if (get_user(new, (int __user *)newval))
3051 return -EFAULT;
3052 *(int *)(table->data) = new*HZ;
3053 }
3054 return 1;
3055 }
3056
3057 /* Strategy function to convert jiffies to seconds */
3058 int sysctl_ms_jiffies(struct ctl_table *table,
3059 void __user *oldval, size_t __user *oldlenp,
3060 void __user *newval, size_t newlen)
3061 {
3062 if (oldval && oldlenp) {
3063 size_t olen;
3064
3065 if (get_user(olen, oldlenp))
3066 return -EFAULT;
3067 if (olen) {
3068 int val;
3069
3070 if (olen < sizeof(int))
3071 return -EINVAL;
3072
3073 val = jiffies_to_msecs(*(int *)(table->data));
3074 if (put_user(val, (int __user *)oldval))
3075 return -EFAULT;
3076 if (put_user(sizeof(int), oldlenp))
3077 return -EFAULT;
3078 }
3079 }
3080 if (newval && newlen) {
3081 int new;
3082 if (newlen != sizeof(int))
3083 return -EINVAL;
3084 if (get_user(new, (int __user *)newval))
3085 return -EFAULT;
3086 *(int *)(table->data) = msecs_to_jiffies(new);
3087 }
3088 return 1;
3089 }
3090
3091
3092
3093 #else /* CONFIG_SYSCTL_SYSCALL */
3094
3095
3096 SYSCALL_DEFINE1(sysctl, struct __sysctl_args __user *, args)
3097 {
3098 struct __sysctl_args tmp;
3099 int error;
3100
3101 if (copy_from_user(&tmp, args, sizeof(tmp)))
3102 return -EFAULT;
3103
3104 error = deprecated_sysctl_warning(&tmp);
3105
3106 /* If no error reading the parameters then just -ENOSYS ... */
3107 if (!error)
3108 error = -ENOSYS;
3109
3110 return error;
3111 }
3112
3113 int sysctl_data(struct ctl_table *table,
3114 void __user *oldval, size_t __user *oldlenp,
3115 void __user *newval, size_t newlen)
3116 {
3117 return -ENOSYS;
3118 }
3119
3120 int sysctl_string(struct ctl_table *table,
3121 void __user *oldval, size_t __user *oldlenp,
3122 void __user *newval, size_t newlen)
3123 {
3124 return -ENOSYS;
3125 }
3126
3127 int sysctl_intvec(struct ctl_table *table,
3128 void __user *oldval, size_t __user *oldlenp,
3129 void __user *newval, size_t newlen)
3130 {
3131 return -ENOSYS;
3132 }
3133
3134 int sysctl_jiffies(struct ctl_table *table,
3135 void __user *oldval, size_t __user *oldlenp,
3136 void __user *newval, size_t newlen)
3137 {
3138 return -ENOSYS;
3139 }
3140
3141 int sysctl_ms_jiffies(struct ctl_table *table,
3142 void __user *oldval, size_t __user *oldlenp,
3143 void __user *newval, size_t newlen)
3144 {
3145 return -ENOSYS;
3146 }
3147
3148 #endif /* CONFIG_SYSCTL_SYSCALL */
3149
3150 static int deprecated_sysctl_warning(struct __sysctl_args *args)
3151 {
3152 static int msg_count;
3153 int name[CTL_MAXNAME];
3154 int i;
3155
3156 /* Check args->nlen. */
3157 if (args->nlen < 0 || args->nlen > CTL_MAXNAME)
3158 return -ENOTDIR;
3159
3160 /* Read in the sysctl name for better debug message logging */
3161 for (i = 0; i < args->nlen; i++)
3162 if (get_user(name[i], args->name + i))
3163 return -EFAULT;
3164
3165 /* Ignore accesses to kernel.version */
3166 if ((args->nlen == 2) && (name[0] == CTL_KERN) && (name[1] == KERN_VERSION))
3167 return 0;
3168
3169 if (msg_count < 5) {
3170 msg_count++;
3171 printk(KERN_INFO
3172 "warning: process `%s' used the deprecated sysctl "
3173 "system call with ", current->comm);
3174 for (i = 0; i < args->nlen; i++)
3175 printk("%d.", name[i]);
3176 printk("\n");
3177 }
3178 return 0;
3179 }
3180
3181 /*
3182 * No sense putting this after each symbol definition, twice,
3183 * exception granted :-)
3184 */
3185 EXPORT_SYMBOL(proc_dointvec);
3186 EXPORT_SYMBOL(proc_dointvec_jiffies);
3187 EXPORT_SYMBOL(proc_dointvec_minmax);
3188 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
3189 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
3190 EXPORT_SYMBOL(proc_dostring);
3191 EXPORT_SYMBOL(proc_doulongvec_minmax);
3192 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
3193 EXPORT_SYMBOL(register_sysctl_table);
3194 EXPORT_SYMBOL(register_sysctl_paths);
3195 EXPORT_SYMBOL(sysctl_intvec);
3196 EXPORT_SYMBOL(sysctl_jiffies);
3197 EXPORT_SYMBOL(sysctl_ms_jiffies);
3198 EXPORT_SYMBOL(sysctl_string);
3199 EXPORT_SYMBOL(sysctl_data);
3200 EXPORT_SYMBOL(unregister_sysctl_table);
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