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Merge branch 'x86/orig_ax' of git://git.kernel.org/pub/scm/linux/kernel/git/frob...
[deliverable/linux.git] / kernel / sysctl.c
1 /*
2 * sysctl.c: General linux system control interface
3 *
4 * Begun 24 March 1995, Stephen Tweedie
5 * Added /proc support, Dec 1995
6 * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas.
7 * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver.
8 * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver.
9 * Dynamic registration fixes, Stephen Tweedie.
10 * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn.
11 * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris
12 * Horn.
13 * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer.
14 * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer.
15 * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill
16 * Wendling.
17 * The list_for_each() macro wasn't appropriate for the sysctl loop.
18 * Removed it and replaced it with older style, 03/23/00, Bill Wendling
19 */
20
21 #include <linux/module.h>
22 #include <linux/mm.h>
23 #include <linux/swap.h>
24 #include <linux/slab.h>
25 #include <linux/sysctl.h>
26 #include <linux/proc_fs.h>
27 #include <linux/security.h>
28 #include <linux/ctype.h>
29 #include <linux/utsname.h>
30 #include <linux/kmemcheck.h>
31 #include <linux/smp_lock.h>
32 #include <linux/fs.h>
33 #include <linux/init.h>
34 #include <linux/kernel.h>
35 #include <linux/kobject.h>
36 #include <linux/net.h>
37 #include <linux/sysrq.h>
38 #include <linux/highuid.h>
39 #include <linux/writeback.h>
40 #include <linux/hugetlb.h>
41 #include <linux/initrd.h>
42 #include <linux/key.h>
43 #include <linux/times.h>
44 #include <linux/limits.h>
45 #include <linux/dcache.h>
46 #include <linux/syscalls.h>
47 #include <linux/vmstat.h>
48 #include <linux/nfs_fs.h>
49 #include <linux/acpi.h>
50 #include <linux/reboot.h>
51 #include <linux/ftrace.h>
52 #include <linux/slow-work.h>
53 #include <linux/perf_event.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 #ifdef CONFIG_BLOCK
95 extern int blk_iopoll_enabled;
96 #endif
97
98 /* Constants used for minimum and maximum */
99 #ifdef CONFIG_DETECT_SOFTLOCKUP
100 static int sixty = 60;
101 static int neg_one = -1;
102 #endif
103
104 static int zero;
105 static int __maybe_unused one = 1;
106 static int __maybe_unused two = 2;
107 static unsigned long one_ul = 1;
108 static int one_hundred = 100;
109 #ifdef CONFIG_PRINTK
110 static int ten_thousand = 10000;
111 #endif
112
113 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
114 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
115
116 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
117 static int maxolduid = 65535;
118 static int minolduid;
119 static int min_percpu_pagelist_fract = 8;
120
121 static int ngroups_max = NGROUPS_MAX;
122
123 #ifdef CONFIG_MODULES
124 extern char modprobe_path[];
125 extern int modules_disabled;
126 #endif
127 #ifdef CONFIG_CHR_DEV_SG
128 extern int sg_big_buff;
129 #endif
130
131 #ifdef CONFIG_SPARC
132 #include <asm/system.h>
133 #endif
134
135 #ifdef CONFIG_SPARC64
136 extern int sysctl_tsb_ratio;
137 #endif
138
139 #ifdef __hppa__
140 extern int pwrsw_enabled;
141 extern int unaligned_enabled;
142 #endif
143
144 #ifdef CONFIG_S390
145 #ifdef CONFIG_MATHEMU
146 extern int sysctl_ieee_emulation_warnings;
147 #endif
148 extern int sysctl_userprocess_debug;
149 extern int spin_retry;
150 #endif
151
152 #ifdef CONFIG_BSD_PROCESS_ACCT
153 extern int acct_parm[];
154 #endif
155
156 #ifdef CONFIG_IA64
157 extern int no_unaligned_warning;
158 extern int unaligned_dump_stack;
159 #endif
160
161 #ifdef CONFIG_RT_MUTEXES
162 extern int max_lock_depth;
163 #endif
164
165 #ifdef CONFIG_PROC_SYSCTL
166 static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
167 void __user *buffer, size_t *lenp, loff_t *ppos);
168 static int proc_taint(struct ctl_table *table, int write, struct file *filp,
169 void __user *buffer, size_t *lenp, loff_t *ppos);
170 #endif
171
172 static struct ctl_table root_table[];
173 static struct ctl_table_root sysctl_table_root;
174 static struct ctl_table_header root_table_header = {
175 .count = 1,
176 .ctl_table = root_table,
177 .ctl_entry = LIST_HEAD_INIT(sysctl_table_root.default_set.list),
178 .root = &sysctl_table_root,
179 .set = &sysctl_table_root.default_set,
180 };
181 static struct ctl_table_root sysctl_table_root = {
182 .root_list = LIST_HEAD_INIT(sysctl_table_root.root_list),
183 .default_set.list = LIST_HEAD_INIT(root_table_header.ctl_entry),
184 };
185
186 static struct ctl_table kern_table[];
187 static struct ctl_table vm_table[];
188 static struct ctl_table fs_table[];
189 static struct ctl_table debug_table[];
190 static struct ctl_table dev_table[];
191 extern struct ctl_table random_table[];
192 #ifdef CONFIG_INOTIFY_USER
193 extern struct ctl_table inotify_table[];
194 #endif
195 #ifdef CONFIG_EPOLL
196 extern struct ctl_table epoll_table[];
197 #endif
198
199 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
200 int sysctl_legacy_va_layout;
201 #endif
202
203 extern int prove_locking;
204 extern int lock_stat;
205
206 /* The default sysctl tables: */
207
208 static struct ctl_table root_table[] = {
209 {
210 .ctl_name = CTL_KERN,
211 .procname = "kernel",
212 .mode = 0555,
213 .child = kern_table,
214 },
215 {
216 .ctl_name = CTL_VM,
217 .procname = "vm",
218 .mode = 0555,
219 .child = vm_table,
220 },
221 {
222 .ctl_name = CTL_FS,
223 .procname = "fs",
224 .mode = 0555,
225 .child = fs_table,
226 },
227 {
228 .ctl_name = CTL_DEBUG,
229 .procname = "debug",
230 .mode = 0555,
231 .child = debug_table,
232 },
233 {
234 .ctl_name = CTL_DEV,
235 .procname = "dev",
236 .mode = 0555,
237 .child = dev_table,
238 },
239 /*
240 * NOTE: do not add new entries to this table unless you have read
241 * Documentation/sysctl/ctl_unnumbered.txt
242 */
243 { .ctl_name = 0 }
244 };
245
246 #ifdef CONFIG_SCHED_DEBUG
247 static int min_sched_granularity_ns = 100000; /* 100 usecs */
248 static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */
249 static int min_wakeup_granularity_ns; /* 0 usecs */
250 static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */
251 #endif
252
253 static struct ctl_table kern_table[] = {
254 {
255 .ctl_name = CTL_UNNUMBERED,
256 .procname = "sched_child_runs_first",
257 .data = &sysctl_sched_child_runs_first,
258 .maxlen = sizeof(unsigned int),
259 .mode = 0644,
260 .proc_handler = &proc_dointvec,
261 },
262 #ifdef CONFIG_SCHED_DEBUG
263 {
264 .ctl_name = CTL_UNNUMBERED,
265 .procname = "sched_min_granularity_ns",
266 .data = &sysctl_sched_min_granularity,
267 .maxlen = sizeof(unsigned int),
268 .mode = 0644,
269 .proc_handler = &sched_nr_latency_handler,
270 .strategy = &sysctl_intvec,
271 .extra1 = &min_sched_granularity_ns,
272 .extra2 = &max_sched_granularity_ns,
273 },
274 {
275 .ctl_name = CTL_UNNUMBERED,
276 .procname = "sched_latency_ns",
277 .data = &sysctl_sched_latency,
278 .maxlen = sizeof(unsigned int),
279 .mode = 0644,
280 .proc_handler = &sched_nr_latency_handler,
281 .strategy = &sysctl_intvec,
282 .extra1 = &min_sched_granularity_ns,
283 .extra2 = &max_sched_granularity_ns,
284 },
285 {
286 .ctl_name = CTL_UNNUMBERED,
287 .procname = "sched_wakeup_granularity_ns",
288 .data = &sysctl_sched_wakeup_granularity,
289 .maxlen = sizeof(unsigned int),
290 .mode = 0644,
291 .proc_handler = &proc_dointvec_minmax,
292 .strategy = &sysctl_intvec,
293 .extra1 = &min_wakeup_granularity_ns,
294 .extra2 = &max_wakeup_granularity_ns,
295 },
296 {
297 .ctl_name = CTL_UNNUMBERED,
298 .procname = "sched_shares_ratelimit",
299 .data = &sysctl_sched_shares_ratelimit,
300 .maxlen = sizeof(unsigned int),
301 .mode = 0644,
302 .proc_handler = &proc_dointvec,
303 },
304 {
305 .ctl_name = CTL_UNNUMBERED,
306 .procname = "sched_shares_thresh",
307 .data = &sysctl_sched_shares_thresh,
308 .maxlen = sizeof(unsigned int),
309 .mode = 0644,
310 .proc_handler = &proc_dointvec_minmax,
311 .strategy = &sysctl_intvec,
312 .extra1 = &zero,
313 },
314 {
315 .ctl_name = CTL_UNNUMBERED,
316 .procname = "sched_features",
317 .data = &sysctl_sched_features,
318 .maxlen = sizeof(unsigned int),
319 .mode = 0644,
320 .proc_handler = &proc_dointvec,
321 },
322 {
323 .ctl_name = CTL_UNNUMBERED,
324 .procname = "sched_migration_cost",
325 .data = &sysctl_sched_migration_cost,
326 .maxlen = sizeof(unsigned int),
327 .mode = 0644,
328 .proc_handler = &proc_dointvec,
329 },
330 {
331 .ctl_name = CTL_UNNUMBERED,
332 .procname = "sched_nr_migrate",
333 .data = &sysctl_sched_nr_migrate,
334 .maxlen = sizeof(unsigned int),
335 .mode = 0644,
336 .proc_handler = &proc_dointvec,
337 },
338 {
339 .ctl_name = CTL_UNNUMBERED,
340 .procname = "sched_time_avg",
341 .data = &sysctl_sched_time_avg,
342 .maxlen = sizeof(unsigned int),
343 .mode = 0644,
344 .proc_handler = &proc_dointvec,
345 },
346 {
347 .ctl_name = CTL_UNNUMBERED,
348 .procname = "timer_migration",
349 .data = &sysctl_timer_migration,
350 .maxlen = sizeof(unsigned int),
351 .mode = 0644,
352 .proc_handler = &proc_dointvec_minmax,
353 .strategy = &sysctl_intvec,
354 .extra1 = &zero,
355 .extra2 = &one,
356 },
357 #endif
358 {
359 .ctl_name = CTL_UNNUMBERED,
360 .procname = "sched_rt_period_us",
361 .data = &sysctl_sched_rt_period,
362 .maxlen = sizeof(unsigned int),
363 .mode = 0644,
364 .proc_handler = &sched_rt_handler,
365 },
366 {
367 .ctl_name = CTL_UNNUMBERED,
368 .procname = "sched_rt_runtime_us",
369 .data = &sysctl_sched_rt_runtime,
370 .maxlen = sizeof(int),
371 .mode = 0644,
372 .proc_handler = &sched_rt_handler,
373 },
374 {
375 .ctl_name = CTL_UNNUMBERED,
376 .procname = "sched_compat_yield",
377 .data = &sysctl_sched_compat_yield,
378 .maxlen = sizeof(unsigned int),
379 .mode = 0644,
380 .proc_handler = &proc_dointvec,
381 },
382 #ifdef CONFIG_PROVE_LOCKING
383 {
384 .ctl_name = CTL_UNNUMBERED,
385 .procname = "prove_locking",
386 .data = &prove_locking,
387 .maxlen = sizeof(int),
388 .mode = 0644,
389 .proc_handler = &proc_dointvec,
390 },
391 #endif
392 #ifdef CONFIG_LOCK_STAT
393 {
394 .ctl_name = CTL_UNNUMBERED,
395 .procname = "lock_stat",
396 .data = &lock_stat,
397 .maxlen = sizeof(int),
398 .mode = 0644,
399 .proc_handler = &proc_dointvec,
400 },
401 #endif
402 {
403 .ctl_name = KERN_PANIC,
404 .procname = "panic",
405 .data = &panic_timeout,
406 .maxlen = sizeof(int),
407 .mode = 0644,
408 .proc_handler = &proc_dointvec,
409 },
410 {
411 .ctl_name = KERN_CORE_USES_PID,
412 .procname = "core_uses_pid",
413 .data = &core_uses_pid,
414 .maxlen = sizeof(int),
415 .mode = 0644,
416 .proc_handler = &proc_dointvec,
417 },
418 {
419 .ctl_name = KERN_CORE_PATTERN,
420 .procname = "core_pattern",
421 .data = core_pattern,
422 .maxlen = CORENAME_MAX_SIZE,
423 .mode = 0644,
424 .proc_handler = &proc_dostring,
425 .strategy = &sysctl_string,
426 },
427 #ifdef CONFIG_PROC_SYSCTL
428 {
429 .procname = "tainted",
430 .maxlen = sizeof(long),
431 .mode = 0644,
432 .proc_handler = &proc_taint,
433 },
434 #endif
435 #ifdef CONFIG_LATENCYTOP
436 {
437 .procname = "latencytop",
438 .data = &latencytop_enabled,
439 .maxlen = sizeof(int),
440 .mode = 0644,
441 .proc_handler = &proc_dointvec,
442 },
443 #endif
444 #ifdef CONFIG_BLK_DEV_INITRD
445 {
446 .ctl_name = KERN_REALROOTDEV,
447 .procname = "real-root-dev",
448 .data = &real_root_dev,
449 .maxlen = sizeof(int),
450 .mode = 0644,
451 .proc_handler = &proc_dointvec,
452 },
453 #endif
454 {
455 .ctl_name = CTL_UNNUMBERED,
456 .procname = "print-fatal-signals",
457 .data = &print_fatal_signals,
458 .maxlen = sizeof(int),
459 .mode = 0644,
460 .proc_handler = &proc_dointvec,
461 },
462 #ifdef CONFIG_SPARC
463 {
464 .ctl_name = KERN_SPARC_REBOOT,
465 .procname = "reboot-cmd",
466 .data = reboot_command,
467 .maxlen = 256,
468 .mode = 0644,
469 .proc_handler = &proc_dostring,
470 .strategy = &sysctl_string,
471 },
472 {
473 .ctl_name = KERN_SPARC_STOP_A,
474 .procname = "stop-a",
475 .data = &stop_a_enabled,
476 .maxlen = sizeof (int),
477 .mode = 0644,
478 .proc_handler = &proc_dointvec,
479 },
480 {
481 .ctl_name = KERN_SPARC_SCONS_PWROFF,
482 .procname = "scons-poweroff",
483 .data = &scons_pwroff,
484 .maxlen = sizeof (int),
485 .mode = 0644,
486 .proc_handler = &proc_dointvec,
487 },
488 #endif
489 #ifdef CONFIG_SPARC64
490 {
491 .ctl_name = CTL_UNNUMBERED,
492 .procname = "tsb-ratio",
493 .data = &sysctl_tsb_ratio,
494 .maxlen = sizeof (int),
495 .mode = 0644,
496 .proc_handler = &proc_dointvec,
497 },
498 #endif
499 #ifdef __hppa__
500 {
501 .ctl_name = KERN_HPPA_PWRSW,
502 .procname = "soft-power",
503 .data = &pwrsw_enabled,
504 .maxlen = sizeof (int),
505 .mode = 0644,
506 .proc_handler = &proc_dointvec,
507 },
508 {
509 .ctl_name = KERN_HPPA_UNALIGNED,
510 .procname = "unaligned-trap",
511 .data = &unaligned_enabled,
512 .maxlen = sizeof (int),
513 .mode = 0644,
514 .proc_handler = &proc_dointvec,
515 },
516 #endif
517 {
518 .ctl_name = KERN_CTLALTDEL,
519 .procname = "ctrl-alt-del",
520 .data = &C_A_D,
521 .maxlen = sizeof(int),
522 .mode = 0644,
523 .proc_handler = &proc_dointvec,
524 },
525 #ifdef CONFIG_FUNCTION_TRACER
526 {
527 .ctl_name = CTL_UNNUMBERED,
528 .procname = "ftrace_enabled",
529 .data = &ftrace_enabled,
530 .maxlen = sizeof(int),
531 .mode = 0644,
532 .proc_handler = &ftrace_enable_sysctl,
533 },
534 #endif
535 #ifdef CONFIG_STACK_TRACER
536 {
537 .ctl_name = CTL_UNNUMBERED,
538 .procname = "stack_tracer_enabled",
539 .data = &stack_tracer_enabled,
540 .maxlen = sizeof(int),
541 .mode = 0644,
542 .proc_handler = &stack_trace_sysctl,
543 },
544 #endif
545 #ifdef CONFIG_TRACING
546 {
547 .ctl_name = CTL_UNNUMBERED,
548 .procname = "ftrace_dump_on_oops",
549 .data = &ftrace_dump_on_oops,
550 .maxlen = sizeof(int),
551 .mode = 0644,
552 .proc_handler = &proc_dointvec,
553 },
554 #endif
555 #ifdef CONFIG_MODULES
556 {
557 .ctl_name = KERN_MODPROBE,
558 .procname = "modprobe",
559 .data = &modprobe_path,
560 .maxlen = KMOD_PATH_LEN,
561 .mode = 0644,
562 .proc_handler = &proc_dostring,
563 .strategy = &sysctl_string,
564 },
565 {
566 .ctl_name = CTL_UNNUMBERED,
567 .procname = "modules_disabled",
568 .data = &modules_disabled,
569 .maxlen = sizeof(int),
570 .mode = 0644,
571 /* only handle a transition from default "0" to "1" */
572 .proc_handler = &proc_dointvec_minmax,
573 .extra1 = &one,
574 .extra2 = &one,
575 },
576 #endif
577 #if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET)
578 {
579 .ctl_name = KERN_HOTPLUG,
580 .procname = "hotplug",
581 .data = &uevent_helper,
582 .maxlen = UEVENT_HELPER_PATH_LEN,
583 .mode = 0644,
584 .proc_handler = &proc_dostring,
585 .strategy = &sysctl_string,
586 },
587 #endif
588 #ifdef CONFIG_CHR_DEV_SG
589 {
590 .ctl_name = KERN_SG_BIG_BUFF,
591 .procname = "sg-big-buff",
592 .data = &sg_big_buff,
593 .maxlen = sizeof (int),
594 .mode = 0444,
595 .proc_handler = &proc_dointvec,
596 },
597 #endif
598 #ifdef CONFIG_BSD_PROCESS_ACCT
599 {
600 .ctl_name = KERN_ACCT,
601 .procname = "acct",
602 .data = &acct_parm,
603 .maxlen = 3*sizeof(int),
604 .mode = 0644,
605 .proc_handler = &proc_dointvec,
606 },
607 #endif
608 #ifdef CONFIG_MAGIC_SYSRQ
609 {
610 .ctl_name = KERN_SYSRQ,
611 .procname = "sysrq",
612 .data = &__sysrq_enabled,
613 .maxlen = sizeof (int),
614 .mode = 0644,
615 .proc_handler = &proc_dointvec,
616 },
617 #endif
618 #ifdef CONFIG_PROC_SYSCTL
619 {
620 .procname = "cad_pid",
621 .data = NULL,
622 .maxlen = sizeof (int),
623 .mode = 0600,
624 .proc_handler = &proc_do_cad_pid,
625 },
626 #endif
627 {
628 .ctl_name = KERN_MAX_THREADS,
629 .procname = "threads-max",
630 .data = &max_threads,
631 .maxlen = sizeof(int),
632 .mode = 0644,
633 .proc_handler = &proc_dointvec,
634 },
635 {
636 .ctl_name = KERN_RANDOM,
637 .procname = "random",
638 .mode = 0555,
639 .child = random_table,
640 },
641 {
642 .ctl_name = KERN_OVERFLOWUID,
643 .procname = "overflowuid",
644 .data = &overflowuid,
645 .maxlen = sizeof(int),
646 .mode = 0644,
647 .proc_handler = &proc_dointvec_minmax,
648 .strategy = &sysctl_intvec,
649 .extra1 = &minolduid,
650 .extra2 = &maxolduid,
651 },
652 {
653 .ctl_name = KERN_OVERFLOWGID,
654 .procname = "overflowgid",
655 .data = &overflowgid,
656 .maxlen = sizeof(int),
657 .mode = 0644,
658 .proc_handler = &proc_dointvec_minmax,
659 .strategy = &sysctl_intvec,
660 .extra1 = &minolduid,
661 .extra2 = &maxolduid,
662 },
663 #ifdef CONFIG_S390
664 #ifdef CONFIG_MATHEMU
665 {
666 .ctl_name = KERN_IEEE_EMULATION_WARNINGS,
667 .procname = "ieee_emulation_warnings",
668 .data = &sysctl_ieee_emulation_warnings,
669 .maxlen = sizeof(int),
670 .mode = 0644,
671 .proc_handler = &proc_dointvec,
672 },
673 #endif
674 {
675 .ctl_name = KERN_S390_USER_DEBUG_LOGGING,
676 .procname = "userprocess_debug",
677 .data = &sysctl_userprocess_debug,
678 .maxlen = sizeof(int),
679 .mode = 0644,
680 .proc_handler = &proc_dointvec,
681 },
682 #endif
683 {
684 .ctl_name = KERN_PIDMAX,
685 .procname = "pid_max",
686 .data = &pid_max,
687 .maxlen = sizeof (int),
688 .mode = 0644,
689 .proc_handler = &proc_dointvec_minmax,
690 .strategy = sysctl_intvec,
691 .extra1 = &pid_max_min,
692 .extra2 = &pid_max_max,
693 },
694 {
695 .ctl_name = KERN_PANIC_ON_OOPS,
696 .procname = "panic_on_oops",
697 .data = &panic_on_oops,
698 .maxlen = sizeof(int),
699 .mode = 0644,
700 .proc_handler = &proc_dointvec,
701 },
702 #if defined CONFIG_PRINTK
703 {
704 .ctl_name = KERN_PRINTK,
705 .procname = "printk",
706 .data = &console_loglevel,
707 .maxlen = 4*sizeof(int),
708 .mode = 0644,
709 .proc_handler = &proc_dointvec,
710 },
711 {
712 .ctl_name = KERN_PRINTK_RATELIMIT,
713 .procname = "printk_ratelimit",
714 .data = &printk_ratelimit_state.interval,
715 .maxlen = sizeof(int),
716 .mode = 0644,
717 .proc_handler = &proc_dointvec_jiffies,
718 .strategy = &sysctl_jiffies,
719 },
720 {
721 .ctl_name = KERN_PRINTK_RATELIMIT_BURST,
722 .procname = "printk_ratelimit_burst",
723 .data = &printk_ratelimit_state.burst,
724 .maxlen = sizeof(int),
725 .mode = 0644,
726 .proc_handler = &proc_dointvec,
727 },
728 {
729 .ctl_name = CTL_UNNUMBERED,
730 .procname = "printk_delay",
731 .data = &printk_delay_msec,
732 .maxlen = sizeof(int),
733 .mode = 0644,
734 .proc_handler = &proc_dointvec_minmax,
735 .strategy = &sysctl_intvec,
736 .extra1 = &zero,
737 .extra2 = &ten_thousand,
738 },
739 #endif
740 {
741 .ctl_name = KERN_NGROUPS_MAX,
742 .procname = "ngroups_max",
743 .data = &ngroups_max,
744 .maxlen = sizeof (int),
745 .mode = 0444,
746 .proc_handler = &proc_dointvec,
747 },
748 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
749 {
750 .ctl_name = KERN_UNKNOWN_NMI_PANIC,
751 .procname = "unknown_nmi_panic",
752 .data = &unknown_nmi_panic,
753 .maxlen = sizeof (int),
754 .mode = 0644,
755 .proc_handler = &proc_dointvec,
756 },
757 {
758 .procname = "nmi_watchdog",
759 .data = &nmi_watchdog_enabled,
760 .maxlen = sizeof (int),
761 .mode = 0644,
762 .proc_handler = &proc_nmi_enabled,
763 },
764 #endif
765 #if defined(CONFIG_X86)
766 {
767 .ctl_name = KERN_PANIC_ON_NMI,
768 .procname = "panic_on_unrecovered_nmi",
769 .data = &panic_on_unrecovered_nmi,
770 .maxlen = sizeof(int),
771 .mode = 0644,
772 .proc_handler = &proc_dointvec,
773 },
774 {
775 .ctl_name = CTL_UNNUMBERED,
776 .procname = "panic_on_io_nmi",
777 .data = &panic_on_io_nmi,
778 .maxlen = sizeof(int),
779 .mode = 0644,
780 .proc_handler = &proc_dointvec,
781 },
782 {
783 .ctl_name = KERN_BOOTLOADER_TYPE,
784 .procname = "bootloader_type",
785 .data = &bootloader_type,
786 .maxlen = sizeof (int),
787 .mode = 0444,
788 .proc_handler = &proc_dointvec,
789 },
790 {
791 .ctl_name = CTL_UNNUMBERED,
792 .procname = "bootloader_version",
793 .data = &bootloader_version,
794 .maxlen = sizeof (int),
795 .mode = 0444,
796 .proc_handler = &proc_dointvec,
797 },
798 {
799 .ctl_name = CTL_UNNUMBERED,
800 .procname = "kstack_depth_to_print",
801 .data = &kstack_depth_to_print,
802 .maxlen = sizeof(int),
803 .mode = 0644,
804 .proc_handler = &proc_dointvec,
805 },
806 {
807 .ctl_name = CTL_UNNUMBERED,
808 .procname = "io_delay_type",
809 .data = &io_delay_type,
810 .maxlen = sizeof(int),
811 .mode = 0644,
812 .proc_handler = &proc_dointvec,
813 },
814 #endif
815 #if defined(CONFIG_MMU)
816 {
817 .ctl_name = KERN_RANDOMIZE,
818 .procname = "randomize_va_space",
819 .data = &randomize_va_space,
820 .maxlen = sizeof(int),
821 .mode = 0644,
822 .proc_handler = &proc_dointvec,
823 },
824 #endif
825 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
826 {
827 .ctl_name = KERN_SPIN_RETRY,
828 .procname = "spin_retry",
829 .data = &spin_retry,
830 .maxlen = sizeof (int),
831 .mode = 0644,
832 .proc_handler = &proc_dointvec,
833 },
834 #endif
835 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
836 {
837 .procname = "acpi_video_flags",
838 .data = &acpi_realmode_flags,
839 .maxlen = sizeof (unsigned long),
840 .mode = 0644,
841 .proc_handler = &proc_doulongvec_minmax,
842 },
843 #endif
844 #ifdef CONFIG_IA64
845 {
846 .ctl_name = KERN_IA64_UNALIGNED,
847 .procname = "ignore-unaligned-usertrap",
848 .data = &no_unaligned_warning,
849 .maxlen = sizeof (int),
850 .mode = 0644,
851 .proc_handler = &proc_dointvec,
852 },
853 {
854 .ctl_name = CTL_UNNUMBERED,
855 .procname = "unaligned-dump-stack",
856 .data = &unaligned_dump_stack,
857 .maxlen = sizeof (int),
858 .mode = 0644,
859 .proc_handler = &proc_dointvec,
860 },
861 #endif
862 #ifdef CONFIG_DETECT_SOFTLOCKUP
863 {
864 .ctl_name = CTL_UNNUMBERED,
865 .procname = "softlockup_panic",
866 .data = &softlockup_panic,
867 .maxlen = sizeof(int),
868 .mode = 0644,
869 .proc_handler = &proc_dointvec_minmax,
870 .strategy = &sysctl_intvec,
871 .extra1 = &zero,
872 .extra2 = &one,
873 },
874 {
875 .ctl_name = CTL_UNNUMBERED,
876 .procname = "softlockup_thresh",
877 .data = &softlockup_thresh,
878 .maxlen = sizeof(int),
879 .mode = 0644,
880 .proc_handler = &proc_dosoftlockup_thresh,
881 .strategy = &sysctl_intvec,
882 .extra1 = &neg_one,
883 .extra2 = &sixty,
884 },
885 #endif
886 #ifdef CONFIG_DETECT_HUNG_TASK
887 {
888 .ctl_name = CTL_UNNUMBERED,
889 .procname = "hung_task_panic",
890 .data = &sysctl_hung_task_panic,
891 .maxlen = sizeof(int),
892 .mode = 0644,
893 .proc_handler = &proc_dointvec_minmax,
894 .strategy = &sysctl_intvec,
895 .extra1 = &zero,
896 .extra2 = &one,
897 },
898 {
899 .ctl_name = CTL_UNNUMBERED,
900 .procname = "hung_task_check_count",
901 .data = &sysctl_hung_task_check_count,
902 .maxlen = sizeof(unsigned long),
903 .mode = 0644,
904 .proc_handler = &proc_doulongvec_minmax,
905 .strategy = &sysctl_intvec,
906 },
907 {
908 .ctl_name = CTL_UNNUMBERED,
909 .procname = "hung_task_timeout_secs",
910 .data = &sysctl_hung_task_timeout_secs,
911 .maxlen = sizeof(unsigned long),
912 .mode = 0644,
913 .proc_handler = &proc_dohung_task_timeout_secs,
914 .strategy = &sysctl_intvec,
915 },
916 {
917 .ctl_name = CTL_UNNUMBERED,
918 .procname = "hung_task_warnings",
919 .data = &sysctl_hung_task_warnings,
920 .maxlen = sizeof(unsigned long),
921 .mode = 0644,
922 .proc_handler = &proc_doulongvec_minmax,
923 .strategy = &sysctl_intvec,
924 },
925 #endif
926 #ifdef CONFIG_COMPAT
927 {
928 .ctl_name = KERN_COMPAT_LOG,
929 .procname = "compat-log",
930 .data = &compat_log,
931 .maxlen = sizeof (int),
932 .mode = 0644,
933 .proc_handler = &proc_dointvec,
934 },
935 #endif
936 #ifdef CONFIG_RT_MUTEXES
937 {
938 .ctl_name = KERN_MAX_LOCK_DEPTH,
939 .procname = "max_lock_depth",
940 .data = &max_lock_depth,
941 .maxlen = sizeof(int),
942 .mode = 0644,
943 .proc_handler = &proc_dointvec,
944 },
945 #endif
946 {
947 .ctl_name = CTL_UNNUMBERED,
948 .procname = "poweroff_cmd",
949 .data = &poweroff_cmd,
950 .maxlen = POWEROFF_CMD_PATH_LEN,
951 .mode = 0644,
952 .proc_handler = &proc_dostring,
953 .strategy = &sysctl_string,
954 },
955 #ifdef CONFIG_KEYS
956 {
957 .ctl_name = CTL_UNNUMBERED,
958 .procname = "keys",
959 .mode = 0555,
960 .child = key_sysctls,
961 },
962 #endif
963 #ifdef CONFIG_RCU_TORTURE_TEST
964 {
965 .ctl_name = CTL_UNNUMBERED,
966 .procname = "rcutorture_runnable",
967 .data = &rcutorture_runnable,
968 .maxlen = sizeof(int),
969 .mode = 0644,
970 .proc_handler = &proc_dointvec,
971 },
972 #endif
973 #ifdef CONFIG_SLOW_WORK
974 {
975 .ctl_name = CTL_UNNUMBERED,
976 .procname = "slow-work",
977 .mode = 0555,
978 .child = slow_work_sysctls,
979 },
980 #endif
981 #ifdef CONFIG_PERF_EVENTS
982 {
983 .ctl_name = CTL_UNNUMBERED,
984 .procname = "perf_event_paranoid",
985 .data = &sysctl_perf_event_paranoid,
986 .maxlen = sizeof(sysctl_perf_event_paranoid),
987 .mode = 0644,
988 .proc_handler = &proc_dointvec,
989 },
990 {
991 .ctl_name = CTL_UNNUMBERED,
992 .procname = "perf_event_mlock_kb",
993 .data = &sysctl_perf_event_mlock,
994 .maxlen = sizeof(sysctl_perf_event_mlock),
995 .mode = 0644,
996 .proc_handler = &proc_dointvec,
997 },
998 {
999 .ctl_name = CTL_UNNUMBERED,
1000 .procname = "perf_event_max_sample_rate",
1001 .data = &sysctl_perf_event_sample_rate,
1002 .maxlen = sizeof(sysctl_perf_event_sample_rate),
1003 .mode = 0644,
1004 .proc_handler = &proc_dointvec,
1005 },
1006 #endif
1007 #ifdef CONFIG_KMEMCHECK
1008 {
1009 .ctl_name = CTL_UNNUMBERED,
1010 .procname = "kmemcheck",
1011 .data = &kmemcheck_enabled,
1012 .maxlen = sizeof(int),
1013 .mode = 0644,
1014 .proc_handler = &proc_dointvec,
1015 },
1016 #endif
1017 #ifdef CONFIG_BLOCK
1018 {
1019 .ctl_name = CTL_UNNUMBERED,
1020 .procname = "blk_iopoll",
1021 .data = &blk_iopoll_enabled,
1022 .maxlen = sizeof(int),
1023 .mode = 0644,
1024 .proc_handler = &proc_dointvec,
1025 },
1026 #endif
1027 /*
1028 * NOTE: do not add new entries to this table unless you have read
1029 * Documentation/sysctl/ctl_unnumbered.txt
1030 */
1031 { .ctl_name = 0 }
1032 };
1033
1034 static struct ctl_table vm_table[] = {
1035 {
1036 .ctl_name = VM_OVERCOMMIT_MEMORY,
1037 .procname = "overcommit_memory",
1038 .data = &sysctl_overcommit_memory,
1039 .maxlen = sizeof(sysctl_overcommit_memory),
1040 .mode = 0644,
1041 .proc_handler = &proc_dointvec,
1042 },
1043 {
1044 .ctl_name = VM_PANIC_ON_OOM,
1045 .procname = "panic_on_oom",
1046 .data = &sysctl_panic_on_oom,
1047 .maxlen = sizeof(sysctl_panic_on_oom),
1048 .mode = 0644,
1049 .proc_handler = &proc_dointvec,
1050 },
1051 {
1052 .ctl_name = CTL_UNNUMBERED,
1053 .procname = "oom_kill_allocating_task",
1054 .data = &sysctl_oom_kill_allocating_task,
1055 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
1056 .mode = 0644,
1057 .proc_handler = &proc_dointvec,
1058 },
1059 {
1060 .ctl_name = CTL_UNNUMBERED,
1061 .procname = "oom_dump_tasks",
1062 .data = &sysctl_oom_dump_tasks,
1063 .maxlen = sizeof(sysctl_oom_dump_tasks),
1064 .mode = 0644,
1065 .proc_handler = &proc_dointvec,
1066 },
1067 {
1068 .ctl_name = VM_OVERCOMMIT_RATIO,
1069 .procname = "overcommit_ratio",
1070 .data = &sysctl_overcommit_ratio,
1071 .maxlen = sizeof(sysctl_overcommit_ratio),
1072 .mode = 0644,
1073 .proc_handler = &proc_dointvec,
1074 },
1075 {
1076 .ctl_name = VM_PAGE_CLUSTER,
1077 .procname = "page-cluster",
1078 .data = &page_cluster,
1079 .maxlen = sizeof(int),
1080 .mode = 0644,
1081 .proc_handler = &proc_dointvec,
1082 },
1083 {
1084 .ctl_name = VM_DIRTY_BACKGROUND,
1085 .procname = "dirty_background_ratio",
1086 .data = &dirty_background_ratio,
1087 .maxlen = sizeof(dirty_background_ratio),
1088 .mode = 0644,
1089 .proc_handler = &dirty_background_ratio_handler,
1090 .strategy = &sysctl_intvec,
1091 .extra1 = &zero,
1092 .extra2 = &one_hundred,
1093 },
1094 {
1095 .ctl_name = CTL_UNNUMBERED,
1096 .procname = "dirty_background_bytes",
1097 .data = &dirty_background_bytes,
1098 .maxlen = sizeof(dirty_background_bytes),
1099 .mode = 0644,
1100 .proc_handler = &dirty_background_bytes_handler,
1101 .strategy = &sysctl_intvec,
1102 .extra1 = &one_ul,
1103 },
1104 {
1105 .ctl_name = VM_DIRTY_RATIO,
1106 .procname = "dirty_ratio",
1107 .data = &vm_dirty_ratio,
1108 .maxlen = sizeof(vm_dirty_ratio),
1109 .mode = 0644,
1110 .proc_handler = &dirty_ratio_handler,
1111 .strategy = &sysctl_intvec,
1112 .extra1 = &zero,
1113 .extra2 = &one_hundred,
1114 },
1115 {
1116 .ctl_name = CTL_UNNUMBERED,
1117 .procname = "dirty_bytes",
1118 .data = &vm_dirty_bytes,
1119 .maxlen = sizeof(vm_dirty_bytes),
1120 .mode = 0644,
1121 .proc_handler = &dirty_bytes_handler,
1122 .strategy = &sysctl_intvec,
1123 .extra1 = &dirty_bytes_min,
1124 },
1125 {
1126 .procname = "dirty_writeback_centisecs",
1127 .data = &dirty_writeback_interval,
1128 .maxlen = sizeof(dirty_writeback_interval),
1129 .mode = 0644,
1130 .proc_handler = &dirty_writeback_centisecs_handler,
1131 },
1132 {
1133 .procname = "dirty_expire_centisecs",
1134 .data = &dirty_expire_interval,
1135 .maxlen = sizeof(dirty_expire_interval),
1136 .mode = 0644,
1137 .proc_handler = &proc_dointvec,
1138 },
1139 {
1140 .ctl_name = VM_NR_PDFLUSH_THREADS,
1141 .procname = "nr_pdflush_threads",
1142 .data = &nr_pdflush_threads,
1143 .maxlen = sizeof nr_pdflush_threads,
1144 .mode = 0444 /* read-only*/,
1145 .proc_handler = &proc_dointvec,
1146 },
1147 {
1148 .ctl_name = VM_SWAPPINESS,
1149 .procname = "swappiness",
1150 .data = &vm_swappiness,
1151 .maxlen = sizeof(vm_swappiness),
1152 .mode = 0644,
1153 .proc_handler = &proc_dointvec_minmax,
1154 .strategy = &sysctl_intvec,
1155 .extra1 = &zero,
1156 .extra2 = &one_hundred,
1157 },
1158 #ifdef CONFIG_HUGETLB_PAGE
1159 {
1160 .procname = "nr_hugepages",
1161 .data = NULL,
1162 .maxlen = sizeof(unsigned long),
1163 .mode = 0644,
1164 .proc_handler = &hugetlb_sysctl_handler,
1165 .extra1 = (void *)&hugetlb_zero,
1166 .extra2 = (void *)&hugetlb_infinity,
1167 },
1168 {
1169 .ctl_name = VM_HUGETLB_GROUP,
1170 .procname = "hugetlb_shm_group",
1171 .data = &sysctl_hugetlb_shm_group,
1172 .maxlen = sizeof(gid_t),
1173 .mode = 0644,
1174 .proc_handler = &proc_dointvec,
1175 },
1176 {
1177 .ctl_name = CTL_UNNUMBERED,
1178 .procname = "hugepages_treat_as_movable",
1179 .data = &hugepages_treat_as_movable,
1180 .maxlen = sizeof(int),
1181 .mode = 0644,
1182 .proc_handler = &hugetlb_treat_movable_handler,
1183 },
1184 {
1185 .ctl_name = CTL_UNNUMBERED,
1186 .procname = "nr_overcommit_hugepages",
1187 .data = NULL,
1188 .maxlen = sizeof(unsigned long),
1189 .mode = 0644,
1190 .proc_handler = &hugetlb_overcommit_handler,
1191 .extra1 = (void *)&hugetlb_zero,
1192 .extra2 = (void *)&hugetlb_infinity,
1193 },
1194 #endif
1195 {
1196 .ctl_name = VM_LOWMEM_RESERVE_RATIO,
1197 .procname = "lowmem_reserve_ratio",
1198 .data = &sysctl_lowmem_reserve_ratio,
1199 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1200 .mode = 0644,
1201 .proc_handler = &lowmem_reserve_ratio_sysctl_handler,
1202 .strategy = &sysctl_intvec,
1203 },
1204 {
1205 .ctl_name = VM_DROP_PAGECACHE,
1206 .procname = "drop_caches",
1207 .data = &sysctl_drop_caches,
1208 .maxlen = sizeof(int),
1209 .mode = 0644,
1210 .proc_handler = drop_caches_sysctl_handler,
1211 .strategy = &sysctl_intvec,
1212 },
1213 {
1214 .ctl_name = VM_MIN_FREE_KBYTES,
1215 .procname = "min_free_kbytes",
1216 .data = &min_free_kbytes,
1217 .maxlen = sizeof(min_free_kbytes),
1218 .mode = 0644,
1219 .proc_handler = &min_free_kbytes_sysctl_handler,
1220 .strategy = &sysctl_intvec,
1221 .extra1 = &zero,
1222 },
1223 {
1224 .ctl_name = VM_PERCPU_PAGELIST_FRACTION,
1225 .procname = "percpu_pagelist_fraction",
1226 .data = &percpu_pagelist_fraction,
1227 .maxlen = sizeof(percpu_pagelist_fraction),
1228 .mode = 0644,
1229 .proc_handler = &percpu_pagelist_fraction_sysctl_handler,
1230 .strategy = &sysctl_intvec,
1231 .extra1 = &min_percpu_pagelist_fract,
1232 },
1233 #ifdef CONFIG_MMU
1234 {
1235 .ctl_name = VM_MAX_MAP_COUNT,
1236 .procname = "max_map_count",
1237 .data = &sysctl_max_map_count,
1238 .maxlen = sizeof(sysctl_max_map_count),
1239 .mode = 0644,
1240 .proc_handler = &proc_dointvec
1241 },
1242 #else
1243 {
1244 .ctl_name = CTL_UNNUMBERED,
1245 .procname = "nr_trim_pages",
1246 .data = &sysctl_nr_trim_pages,
1247 .maxlen = sizeof(sysctl_nr_trim_pages),
1248 .mode = 0644,
1249 .proc_handler = &proc_dointvec_minmax,
1250 .strategy = &sysctl_intvec,
1251 .extra1 = &zero,
1252 },
1253 #endif
1254 {
1255 .ctl_name = VM_LAPTOP_MODE,
1256 .procname = "laptop_mode",
1257 .data = &laptop_mode,
1258 .maxlen = sizeof(laptop_mode),
1259 .mode = 0644,
1260 .proc_handler = &proc_dointvec_jiffies,
1261 .strategy = &sysctl_jiffies,
1262 },
1263 {
1264 .ctl_name = VM_BLOCK_DUMP,
1265 .procname = "block_dump",
1266 .data = &block_dump,
1267 .maxlen = sizeof(block_dump),
1268 .mode = 0644,
1269 .proc_handler = &proc_dointvec,
1270 .strategy = &sysctl_intvec,
1271 .extra1 = &zero,
1272 },
1273 {
1274 .ctl_name = VM_VFS_CACHE_PRESSURE,
1275 .procname = "vfs_cache_pressure",
1276 .data = &sysctl_vfs_cache_pressure,
1277 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1278 .mode = 0644,
1279 .proc_handler = &proc_dointvec,
1280 .strategy = &sysctl_intvec,
1281 .extra1 = &zero,
1282 },
1283 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1284 {
1285 .ctl_name = VM_LEGACY_VA_LAYOUT,
1286 .procname = "legacy_va_layout",
1287 .data = &sysctl_legacy_va_layout,
1288 .maxlen = sizeof(sysctl_legacy_va_layout),
1289 .mode = 0644,
1290 .proc_handler = &proc_dointvec,
1291 .strategy = &sysctl_intvec,
1292 .extra1 = &zero,
1293 },
1294 #endif
1295 #ifdef CONFIG_NUMA
1296 {
1297 .ctl_name = VM_ZONE_RECLAIM_MODE,
1298 .procname = "zone_reclaim_mode",
1299 .data = &zone_reclaim_mode,
1300 .maxlen = sizeof(zone_reclaim_mode),
1301 .mode = 0644,
1302 .proc_handler = &proc_dointvec,
1303 .strategy = &sysctl_intvec,
1304 .extra1 = &zero,
1305 },
1306 {
1307 .ctl_name = VM_MIN_UNMAPPED,
1308 .procname = "min_unmapped_ratio",
1309 .data = &sysctl_min_unmapped_ratio,
1310 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1311 .mode = 0644,
1312 .proc_handler = &sysctl_min_unmapped_ratio_sysctl_handler,
1313 .strategy = &sysctl_intvec,
1314 .extra1 = &zero,
1315 .extra2 = &one_hundred,
1316 },
1317 {
1318 .ctl_name = VM_MIN_SLAB,
1319 .procname = "min_slab_ratio",
1320 .data = &sysctl_min_slab_ratio,
1321 .maxlen = sizeof(sysctl_min_slab_ratio),
1322 .mode = 0644,
1323 .proc_handler = &sysctl_min_slab_ratio_sysctl_handler,
1324 .strategy = &sysctl_intvec,
1325 .extra1 = &zero,
1326 .extra2 = &one_hundred,
1327 },
1328 #endif
1329 #ifdef CONFIG_SMP
1330 {
1331 .ctl_name = CTL_UNNUMBERED,
1332 .procname = "stat_interval",
1333 .data = &sysctl_stat_interval,
1334 .maxlen = sizeof(sysctl_stat_interval),
1335 .mode = 0644,
1336 .proc_handler = &proc_dointvec_jiffies,
1337 .strategy = &sysctl_jiffies,
1338 },
1339 #endif
1340 {
1341 .ctl_name = CTL_UNNUMBERED,
1342 .procname = "mmap_min_addr",
1343 .data = &dac_mmap_min_addr,
1344 .maxlen = sizeof(unsigned long),
1345 .mode = 0644,
1346 .proc_handler = &mmap_min_addr_handler,
1347 },
1348 #ifdef CONFIG_NUMA
1349 {
1350 .ctl_name = CTL_UNNUMBERED,
1351 .procname = "numa_zonelist_order",
1352 .data = &numa_zonelist_order,
1353 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1354 .mode = 0644,
1355 .proc_handler = &numa_zonelist_order_handler,
1356 .strategy = &sysctl_string,
1357 },
1358 #endif
1359 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1360 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1361 {
1362 .ctl_name = VM_VDSO_ENABLED,
1363 .procname = "vdso_enabled",
1364 .data = &vdso_enabled,
1365 .maxlen = sizeof(vdso_enabled),
1366 .mode = 0644,
1367 .proc_handler = &proc_dointvec,
1368 .strategy = &sysctl_intvec,
1369 .extra1 = &zero,
1370 },
1371 #endif
1372 #ifdef CONFIG_HIGHMEM
1373 {
1374 .ctl_name = CTL_UNNUMBERED,
1375 .procname = "highmem_is_dirtyable",
1376 .data = &vm_highmem_is_dirtyable,
1377 .maxlen = sizeof(vm_highmem_is_dirtyable),
1378 .mode = 0644,
1379 .proc_handler = &proc_dointvec_minmax,
1380 .strategy = &sysctl_intvec,
1381 .extra1 = &zero,
1382 .extra2 = &one,
1383 },
1384 #endif
1385 {
1386 .ctl_name = CTL_UNNUMBERED,
1387 .procname = "scan_unevictable_pages",
1388 .data = &scan_unevictable_pages,
1389 .maxlen = sizeof(scan_unevictable_pages),
1390 .mode = 0644,
1391 .proc_handler = &scan_unevictable_handler,
1392 },
1393 /*
1394 * NOTE: do not add new entries to this table unless you have read
1395 * Documentation/sysctl/ctl_unnumbered.txt
1396 */
1397 { .ctl_name = 0 }
1398 };
1399
1400 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1401 static struct ctl_table binfmt_misc_table[] = {
1402 { .ctl_name = 0 }
1403 };
1404 #endif
1405
1406 static struct ctl_table fs_table[] = {
1407 {
1408 .ctl_name = FS_NRINODE,
1409 .procname = "inode-nr",
1410 .data = &inodes_stat,
1411 .maxlen = 2*sizeof(int),
1412 .mode = 0444,
1413 .proc_handler = &proc_dointvec,
1414 },
1415 {
1416 .ctl_name = FS_STATINODE,
1417 .procname = "inode-state",
1418 .data = &inodes_stat,
1419 .maxlen = 7*sizeof(int),
1420 .mode = 0444,
1421 .proc_handler = &proc_dointvec,
1422 },
1423 {
1424 .procname = "file-nr",
1425 .data = &files_stat,
1426 .maxlen = 3*sizeof(int),
1427 .mode = 0444,
1428 .proc_handler = &proc_nr_files,
1429 },
1430 {
1431 .ctl_name = FS_MAXFILE,
1432 .procname = "file-max",
1433 .data = &files_stat.max_files,
1434 .maxlen = sizeof(int),
1435 .mode = 0644,
1436 .proc_handler = &proc_dointvec,
1437 },
1438 {
1439 .ctl_name = CTL_UNNUMBERED,
1440 .procname = "nr_open",
1441 .data = &sysctl_nr_open,
1442 .maxlen = sizeof(int),
1443 .mode = 0644,
1444 .proc_handler = &proc_dointvec_minmax,
1445 .extra1 = &sysctl_nr_open_min,
1446 .extra2 = &sysctl_nr_open_max,
1447 },
1448 {
1449 .ctl_name = FS_DENTRY,
1450 .procname = "dentry-state",
1451 .data = &dentry_stat,
1452 .maxlen = 6*sizeof(int),
1453 .mode = 0444,
1454 .proc_handler = &proc_dointvec,
1455 },
1456 {
1457 .ctl_name = FS_OVERFLOWUID,
1458 .procname = "overflowuid",
1459 .data = &fs_overflowuid,
1460 .maxlen = sizeof(int),
1461 .mode = 0644,
1462 .proc_handler = &proc_dointvec_minmax,
1463 .strategy = &sysctl_intvec,
1464 .extra1 = &minolduid,
1465 .extra2 = &maxolduid,
1466 },
1467 {
1468 .ctl_name = FS_OVERFLOWGID,
1469 .procname = "overflowgid",
1470 .data = &fs_overflowgid,
1471 .maxlen = sizeof(int),
1472 .mode = 0644,
1473 .proc_handler = &proc_dointvec_minmax,
1474 .strategy = &sysctl_intvec,
1475 .extra1 = &minolduid,
1476 .extra2 = &maxolduid,
1477 },
1478 #ifdef CONFIG_FILE_LOCKING
1479 {
1480 .ctl_name = FS_LEASES,
1481 .procname = "leases-enable",
1482 .data = &leases_enable,
1483 .maxlen = sizeof(int),
1484 .mode = 0644,
1485 .proc_handler = &proc_dointvec,
1486 },
1487 #endif
1488 #ifdef CONFIG_DNOTIFY
1489 {
1490 .ctl_name = FS_DIR_NOTIFY,
1491 .procname = "dir-notify-enable",
1492 .data = &dir_notify_enable,
1493 .maxlen = sizeof(int),
1494 .mode = 0644,
1495 .proc_handler = &proc_dointvec,
1496 },
1497 #endif
1498 #ifdef CONFIG_MMU
1499 #ifdef CONFIG_FILE_LOCKING
1500 {
1501 .ctl_name = FS_LEASE_TIME,
1502 .procname = "lease-break-time",
1503 .data = &lease_break_time,
1504 .maxlen = sizeof(int),
1505 .mode = 0644,
1506 .proc_handler = &proc_dointvec,
1507 },
1508 #endif
1509 #ifdef CONFIG_AIO
1510 {
1511 .procname = "aio-nr",
1512 .data = &aio_nr,
1513 .maxlen = sizeof(aio_nr),
1514 .mode = 0444,
1515 .proc_handler = &proc_doulongvec_minmax,
1516 },
1517 {
1518 .procname = "aio-max-nr",
1519 .data = &aio_max_nr,
1520 .maxlen = sizeof(aio_max_nr),
1521 .mode = 0644,
1522 .proc_handler = &proc_doulongvec_minmax,
1523 },
1524 #endif /* CONFIG_AIO */
1525 #ifdef CONFIG_INOTIFY_USER
1526 {
1527 .ctl_name = FS_INOTIFY,
1528 .procname = "inotify",
1529 .mode = 0555,
1530 .child = inotify_table,
1531 },
1532 #endif
1533 #ifdef CONFIG_EPOLL
1534 {
1535 .procname = "epoll",
1536 .mode = 0555,
1537 .child = epoll_table,
1538 },
1539 #endif
1540 #endif
1541 {
1542 .ctl_name = KERN_SETUID_DUMPABLE,
1543 .procname = "suid_dumpable",
1544 .data = &suid_dumpable,
1545 .maxlen = sizeof(int),
1546 .mode = 0644,
1547 .proc_handler = &proc_dointvec_minmax,
1548 .strategy = &sysctl_intvec,
1549 .extra1 = &zero,
1550 .extra2 = &two,
1551 },
1552 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1553 {
1554 .ctl_name = CTL_UNNUMBERED,
1555 .procname = "binfmt_misc",
1556 .mode = 0555,
1557 .child = binfmt_misc_table,
1558 },
1559 #endif
1560 /*
1561 * NOTE: do not add new entries to this table unless you have read
1562 * Documentation/sysctl/ctl_unnumbered.txt
1563 */
1564 { .ctl_name = 0 }
1565 };
1566
1567 static struct ctl_table debug_table[] = {
1568 #if defined(CONFIG_X86) || defined(CONFIG_PPC)
1569 {
1570 .ctl_name = CTL_UNNUMBERED,
1571 .procname = "exception-trace",
1572 .data = &show_unhandled_signals,
1573 .maxlen = sizeof(int),
1574 .mode = 0644,
1575 .proc_handler = proc_dointvec
1576 },
1577 #endif
1578 { .ctl_name = 0 }
1579 };
1580
1581 static struct ctl_table dev_table[] = {
1582 { .ctl_name = 0 }
1583 };
1584
1585 static DEFINE_SPINLOCK(sysctl_lock);
1586
1587 /* called under sysctl_lock */
1588 static int use_table(struct ctl_table_header *p)
1589 {
1590 if (unlikely(p->unregistering))
1591 return 0;
1592 p->used++;
1593 return 1;
1594 }
1595
1596 /* called under sysctl_lock */
1597 static void unuse_table(struct ctl_table_header *p)
1598 {
1599 if (!--p->used)
1600 if (unlikely(p->unregistering))
1601 complete(p->unregistering);
1602 }
1603
1604 /* called under sysctl_lock, will reacquire if has to wait */
1605 static void start_unregistering(struct ctl_table_header *p)
1606 {
1607 /*
1608 * if p->used is 0, nobody will ever touch that entry again;
1609 * we'll eliminate all paths to it before dropping sysctl_lock
1610 */
1611 if (unlikely(p->used)) {
1612 struct completion wait;
1613 init_completion(&wait);
1614 p->unregistering = &wait;
1615 spin_unlock(&sysctl_lock);
1616 wait_for_completion(&wait);
1617 spin_lock(&sysctl_lock);
1618 } else {
1619 /* anything non-NULL; we'll never dereference it */
1620 p->unregistering = ERR_PTR(-EINVAL);
1621 }
1622 /*
1623 * do not remove from the list until nobody holds it; walking the
1624 * list in do_sysctl() relies on that.
1625 */
1626 list_del_init(&p->ctl_entry);
1627 }
1628
1629 void sysctl_head_get(struct ctl_table_header *head)
1630 {
1631 spin_lock(&sysctl_lock);
1632 head->count++;
1633 spin_unlock(&sysctl_lock);
1634 }
1635
1636 void sysctl_head_put(struct ctl_table_header *head)
1637 {
1638 spin_lock(&sysctl_lock);
1639 if (!--head->count)
1640 kfree(head);
1641 spin_unlock(&sysctl_lock);
1642 }
1643
1644 struct ctl_table_header *sysctl_head_grab(struct ctl_table_header *head)
1645 {
1646 if (!head)
1647 BUG();
1648 spin_lock(&sysctl_lock);
1649 if (!use_table(head))
1650 head = ERR_PTR(-ENOENT);
1651 spin_unlock(&sysctl_lock);
1652 return head;
1653 }
1654
1655 void sysctl_head_finish(struct ctl_table_header *head)
1656 {
1657 if (!head)
1658 return;
1659 spin_lock(&sysctl_lock);
1660 unuse_table(head);
1661 spin_unlock(&sysctl_lock);
1662 }
1663
1664 static struct ctl_table_set *
1665 lookup_header_set(struct ctl_table_root *root, struct nsproxy *namespaces)
1666 {
1667 struct ctl_table_set *set = &root->default_set;
1668 if (root->lookup)
1669 set = root->lookup(root, namespaces);
1670 return set;
1671 }
1672
1673 static struct list_head *
1674 lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces)
1675 {
1676 struct ctl_table_set *set = lookup_header_set(root, namespaces);
1677 return &set->list;
1678 }
1679
1680 struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces,
1681 struct ctl_table_header *prev)
1682 {
1683 struct ctl_table_root *root;
1684 struct list_head *header_list;
1685 struct ctl_table_header *head;
1686 struct list_head *tmp;
1687
1688 spin_lock(&sysctl_lock);
1689 if (prev) {
1690 head = prev;
1691 tmp = &prev->ctl_entry;
1692 unuse_table(prev);
1693 goto next;
1694 }
1695 tmp = &root_table_header.ctl_entry;
1696 for (;;) {
1697 head = list_entry(tmp, struct ctl_table_header, ctl_entry);
1698
1699 if (!use_table(head))
1700 goto next;
1701 spin_unlock(&sysctl_lock);
1702 return head;
1703 next:
1704 root = head->root;
1705 tmp = tmp->next;
1706 header_list = lookup_header_list(root, namespaces);
1707 if (tmp != header_list)
1708 continue;
1709
1710 do {
1711 root = list_entry(root->root_list.next,
1712 struct ctl_table_root, root_list);
1713 if (root == &sysctl_table_root)
1714 goto out;
1715 header_list = lookup_header_list(root, namespaces);
1716 } while (list_empty(header_list));
1717 tmp = header_list->next;
1718 }
1719 out:
1720 spin_unlock(&sysctl_lock);
1721 return NULL;
1722 }
1723
1724 struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev)
1725 {
1726 return __sysctl_head_next(current->nsproxy, prev);
1727 }
1728
1729 void register_sysctl_root(struct ctl_table_root *root)
1730 {
1731 spin_lock(&sysctl_lock);
1732 list_add_tail(&root->root_list, &sysctl_table_root.root_list);
1733 spin_unlock(&sysctl_lock);
1734 }
1735
1736 #ifdef CONFIG_SYSCTL_SYSCALL
1737 /* Perform the actual read/write of a sysctl table entry. */
1738 static int do_sysctl_strategy(struct ctl_table_root *root,
1739 struct ctl_table *table,
1740 void __user *oldval, size_t __user *oldlenp,
1741 void __user *newval, size_t newlen)
1742 {
1743 int op = 0, rc;
1744
1745 if (oldval)
1746 op |= MAY_READ;
1747 if (newval)
1748 op |= MAY_WRITE;
1749 if (sysctl_perm(root, table, op))
1750 return -EPERM;
1751
1752 if (table->strategy) {
1753 rc = table->strategy(table, oldval, oldlenp, newval, newlen);
1754 if (rc < 0)
1755 return rc;
1756 if (rc > 0)
1757 return 0;
1758 }
1759
1760 /* If there is no strategy routine, or if the strategy returns
1761 * zero, proceed with automatic r/w */
1762 if (table->data && table->maxlen) {
1763 rc = sysctl_data(table, oldval, oldlenp, newval, newlen);
1764 if (rc < 0)
1765 return rc;
1766 }
1767 return 0;
1768 }
1769
1770 static int parse_table(int __user *name, int nlen,
1771 void __user *oldval, size_t __user *oldlenp,
1772 void __user *newval, size_t newlen,
1773 struct ctl_table_root *root,
1774 struct ctl_table *table)
1775 {
1776 int n;
1777 repeat:
1778 if (!nlen)
1779 return -ENOTDIR;
1780 if (get_user(n, name))
1781 return -EFAULT;
1782 for ( ; table->ctl_name || table->procname; table++) {
1783 if (!table->ctl_name)
1784 continue;
1785 if (n == table->ctl_name) {
1786 int error;
1787 if (table->child) {
1788 if (sysctl_perm(root, table, MAY_EXEC))
1789 return -EPERM;
1790 name++;
1791 nlen--;
1792 table = table->child;
1793 goto repeat;
1794 }
1795 error = do_sysctl_strategy(root, table,
1796 oldval, oldlenp,
1797 newval, newlen);
1798 return error;
1799 }
1800 }
1801 return -ENOTDIR;
1802 }
1803
1804 int do_sysctl(int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp,
1805 void __user *newval, size_t newlen)
1806 {
1807 struct ctl_table_header *head;
1808 int error = -ENOTDIR;
1809
1810 if (nlen <= 0 || nlen >= CTL_MAXNAME)
1811 return -ENOTDIR;
1812 if (oldval) {
1813 int old_len;
1814 if (!oldlenp || get_user(old_len, oldlenp))
1815 return -EFAULT;
1816 }
1817
1818 for (head = sysctl_head_next(NULL); head;
1819 head = sysctl_head_next(head)) {
1820 error = parse_table(name, nlen, oldval, oldlenp,
1821 newval, newlen,
1822 head->root, head->ctl_table);
1823 if (error != -ENOTDIR) {
1824 sysctl_head_finish(head);
1825 break;
1826 }
1827 }
1828 return error;
1829 }
1830
1831 SYSCALL_DEFINE1(sysctl, struct __sysctl_args __user *, args)
1832 {
1833 struct __sysctl_args tmp;
1834 int error;
1835
1836 if (copy_from_user(&tmp, args, sizeof(tmp)))
1837 return -EFAULT;
1838
1839 error = deprecated_sysctl_warning(&tmp);
1840 if (error)
1841 goto out;
1842
1843 lock_kernel();
1844 error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp,
1845 tmp.newval, tmp.newlen);
1846 unlock_kernel();
1847 out:
1848 return error;
1849 }
1850 #endif /* CONFIG_SYSCTL_SYSCALL */
1851
1852 /*
1853 * sysctl_perm does NOT grant the superuser all rights automatically, because
1854 * some sysctl variables are readonly even to root.
1855 */
1856
1857 static int test_perm(int mode, int op)
1858 {
1859 if (!current_euid())
1860 mode >>= 6;
1861 else if (in_egroup_p(0))
1862 mode >>= 3;
1863 if ((op & ~mode & (MAY_READ|MAY_WRITE|MAY_EXEC)) == 0)
1864 return 0;
1865 return -EACCES;
1866 }
1867
1868 int sysctl_perm(struct ctl_table_root *root, struct ctl_table *table, int op)
1869 {
1870 int error;
1871 int mode;
1872
1873 error = security_sysctl(table, op & (MAY_READ | MAY_WRITE | MAY_EXEC));
1874 if (error)
1875 return error;
1876
1877 if (root->permissions)
1878 mode = root->permissions(root, current->nsproxy, table);
1879 else
1880 mode = table->mode;
1881
1882 return test_perm(mode, op);
1883 }
1884
1885 static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table)
1886 {
1887 for (; table->ctl_name || table->procname; table++) {
1888 table->parent = parent;
1889 if (table->child)
1890 sysctl_set_parent(table, table->child);
1891 }
1892 }
1893
1894 static __init int sysctl_init(void)
1895 {
1896 sysctl_set_parent(NULL, root_table);
1897 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK
1898 {
1899 int err;
1900 err = sysctl_check_table(current->nsproxy, root_table);
1901 }
1902 #endif
1903 return 0;
1904 }
1905
1906 core_initcall(sysctl_init);
1907
1908 static struct ctl_table *is_branch_in(struct ctl_table *branch,
1909 struct ctl_table *table)
1910 {
1911 struct ctl_table *p;
1912 const char *s = branch->procname;
1913
1914 /* branch should have named subdirectory as its first element */
1915 if (!s || !branch->child)
1916 return NULL;
1917
1918 /* ... and nothing else */
1919 if (branch[1].procname || branch[1].ctl_name)
1920 return NULL;
1921
1922 /* table should contain subdirectory with the same name */
1923 for (p = table; p->procname || p->ctl_name; p++) {
1924 if (!p->child)
1925 continue;
1926 if (p->procname && strcmp(p->procname, s) == 0)
1927 return p;
1928 }
1929 return NULL;
1930 }
1931
1932 /* see if attaching q to p would be an improvement */
1933 static void try_attach(struct ctl_table_header *p, struct ctl_table_header *q)
1934 {
1935 struct ctl_table *to = p->ctl_table, *by = q->ctl_table;
1936 struct ctl_table *next;
1937 int is_better = 0;
1938 int not_in_parent = !p->attached_by;
1939
1940 while ((next = is_branch_in(by, to)) != NULL) {
1941 if (by == q->attached_by)
1942 is_better = 1;
1943 if (to == p->attached_by)
1944 not_in_parent = 1;
1945 by = by->child;
1946 to = next->child;
1947 }
1948
1949 if (is_better && not_in_parent) {
1950 q->attached_by = by;
1951 q->attached_to = to;
1952 q->parent = p;
1953 }
1954 }
1955
1956 /**
1957 * __register_sysctl_paths - register a sysctl hierarchy
1958 * @root: List of sysctl headers to register on
1959 * @namespaces: Data to compute which lists of sysctl entries are visible
1960 * @path: The path to the directory the sysctl table is in.
1961 * @table: the top-level table structure
1962 *
1963 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1964 * array. A completely 0 filled entry terminates the table.
1965 *
1966 * The members of the &struct ctl_table structure are used as follows:
1967 *
1968 * ctl_name - This is the numeric sysctl value used by sysctl(2). The number
1969 * must be unique within that level of sysctl
1970 *
1971 * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1972 * enter a sysctl file
1973 *
1974 * data - a pointer to data for use by proc_handler
1975 *
1976 * maxlen - the maximum size in bytes of the data
1977 *
1978 * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1979 *
1980 * child - a pointer to the child sysctl table if this entry is a directory, or
1981 * %NULL.
1982 *
1983 * proc_handler - the text handler routine (described below)
1984 *
1985 * strategy - the strategy routine (described below)
1986 *
1987 * de - for internal use by the sysctl routines
1988 *
1989 * extra1, extra2 - extra pointers usable by the proc handler routines
1990 *
1991 * Leaf nodes in the sysctl tree will be represented by a single file
1992 * under /proc; non-leaf nodes will be represented by directories.
1993 *
1994 * sysctl(2) can automatically manage read and write requests through
1995 * the sysctl table. The data and maxlen fields of the ctl_table
1996 * struct enable minimal validation of the values being written to be
1997 * performed, and the mode field allows minimal authentication.
1998 *
1999 * More sophisticated management can be enabled by the provision of a
2000 * strategy routine with the table entry. This will be called before
2001 * any automatic read or write of the data is performed.
2002 *
2003 * The strategy routine may return
2004 *
2005 * < 0 - Error occurred (error is passed to user process)
2006 *
2007 * 0 - OK - proceed with automatic read or write.
2008 *
2009 * > 0 - OK - read or write has been done by the strategy routine, so
2010 * return immediately.
2011 *
2012 * There must be a proc_handler routine for any terminal nodes
2013 * mirrored under /proc/sys (non-terminals are handled by a built-in
2014 * directory handler). Several default handlers are available to
2015 * cover common cases -
2016 *
2017 * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
2018 * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(),
2019 * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
2020 *
2021 * It is the handler's job to read the input buffer from user memory
2022 * and process it. The handler should return 0 on success.
2023 *
2024 * This routine returns %NULL on a failure to register, and a pointer
2025 * to the table header on success.
2026 */
2027 struct ctl_table_header *__register_sysctl_paths(
2028 struct ctl_table_root *root,
2029 struct nsproxy *namespaces,
2030 const struct ctl_path *path, struct ctl_table *table)
2031 {
2032 struct ctl_table_header *header;
2033 struct ctl_table *new, **prevp;
2034 unsigned int n, npath;
2035 struct ctl_table_set *set;
2036
2037 /* Count the path components */
2038 for (npath = 0; path[npath].ctl_name || path[npath].procname; ++npath)
2039 ;
2040
2041 /*
2042 * For each path component, allocate a 2-element ctl_table array.
2043 * The first array element will be filled with the sysctl entry
2044 * for this, the second will be the sentinel (ctl_name == 0).
2045 *
2046 * We allocate everything in one go so that we don't have to
2047 * worry about freeing additional memory in unregister_sysctl_table.
2048 */
2049 header = kzalloc(sizeof(struct ctl_table_header) +
2050 (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL);
2051 if (!header)
2052 return NULL;
2053
2054 new = (struct ctl_table *) (header + 1);
2055
2056 /* Now connect the dots */
2057 prevp = &header->ctl_table;
2058 for (n = 0; n < npath; ++n, ++path) {
2059 /* Copy the procname */
2060 new->procname = path->procname;
2061 new->ctl_name = path->ctl_name;
2062 new->mode = 0555;
2063
2064 *prevp = new;
2065 prevp = &new->child;
2066
2067 new += 2;
2068 }
2069 *prevp = table;
2070 header->ctl_table_arg = table;
2071
2072 INIT_LIST_HEAD(&header->ctl_entry);
2073 header->used = 0;
2074 header->unregistering = NULL;
2075 header->root = root;
2076 sysctl_set_parent(NULL, header->ctl_table);
2077 header->count = 1;
2078 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK
2079 if (sysctl_check_table(namespaces, header->ctl_table)) {
2080 kfree(header);
2081 return NULL;
2082 }
2083 #endif
2084 spin_lock(&sysctl_lock);
2085 header->set = lookup_header_set(root, namespaces);
2086 header->attached_by = header->ctl_table;
2087 header->attached_to = root_table;
2088 header->parent = &root_table_header;
2089 for (set = header->set; set; set = set->parent) {
2090 struct ctl_table_header *p;
2091 list_for_each_entry(p, &set->list, ctl_entry) {
2092 if (p->unregistering)
2093 continue;
2094 try_attach(p, header);
2095 }
2096 }
2097 header->parent->count++;
2098 list_add_tail(&header->ctl_entry, &header->set->list);
2099 spin_unlock(&sysctl_lock);
2100
2101 return header;
2102 }
2103
2104 /**
2105 * register_sysctl_table_path - register a sysctl table hierarchy
2106 * @path: The path to the directory the sysctl table is in.
2107 * @table: the top-level table structure
2108 *
2109 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
2110 * array. A completely 0 filled entry terminates the table.
2111 *
2112 * See __register_sysctl_paths for more details.
2113 */
2114 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
2115 struct ctl_table *table)
2116 {
2117 return __register_sysctl_paths(&sysctl_table_root, current->nsproxy,
2118 path, table);
2119 }
2120
2121 /**
2122 * register_sysctl_table - register a sysctl table hierarchy
2123 * @table: the top-level table structure
2124 *
2125 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
2126 * array. A completely 0 filled entry terminates the table.
2127 *
2128 * See register_sysctl_paths for more details.
2129 */
2130 struct ctl_table_header *register_sysctl_table(struct ctl_table *table)
2131 {
2132 static const struct ctl_path null_path[] = { {} };
2133
2134 return register_sysctl_paths(null_path, table);
2135 }
2136
2137 /**
2138 * unregister_sysctl_table - unregister a sysctl table hierarchy
2139 * @header: the header returned from register_sysctl_table
2140 *
2141 * Unregisters the sysctl table and all children. proc entries may not
2142 * actually be removed until they are no longer used by anyone.
2143 */
2144 void unregister_sysctl_table(struct ctl_table_header * header)
2145 {
2146 might_sleep();
2147
2148 if (header == NULL)
2149 return;
2150
2151 spin_lock(&sysctl_lock);
2152 start_unregistering(header);
2153 if (!--header->parent->count) {
2154 WARN_ON(1);
2155 kfree(header->parent);
2156 }
2157 if (!--header->count)
2158 kfree(header);
2159 spin_unlock(&sysctl_lock);
2160 }
2161
2162 int sysctl_is_seen(struct ctl_table_header *p)
2163 {
2164 struct ctl_table_set *set = p->set;
2165 int res;
2166 spin_lock(&sysctl_lock);
2167 if (p->unregistering)
2168 res = 0;
2169 else if (!set->is_seen)
2170 res = 1;
2171 else
2172 res = set->is_seen(set);
2173 spin_unlock(&sysctl_lock);
2174 return res;
2175 }
2176
2177 void setup_sysctl_set(struct ctl_table_set *p,
2178 struct ctl_table_set *parent,
2179 int (*is_seen)(struct ctl_table_set *))
2180 {
2181 INIT_LIST_HEAD(&p->list);
2182 p->parent = parent ? parent : &sysctl_table_root.default_set;
2183 p->is_seen = is_seen;
2184 }
2185
2186 #else /* !CONFIG_SYSCTL */
2187 struct ctl_table_header *register_sysctl_table(struct ctl_table * table)
2188 {
2189 return NULL;
2190 }
2191
2192 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
2193 struct ctl_table *table)
2194 {
2195 return NULL;
2196 }
2197
2198 void unregister_sysctl_table(struct ctl_table_header * table)
2199 {
2200 }
2201
2202 void setup_sysctl_set(struct ctl_table_set *p,
2203 struct ctl_table_set *parent,
2204 int (*is_seen)(struct ctl_table_set *))
2205 {
2206 }
2207
2208 void sysctl_head_put(struct ctl_table_header *head)
2209 {
2210 }
2211
2212 #endif /* CONFIG_SYSCTL */
2213
2214 /*
2215 * /proc/sys support
2216 */
2217
2218 #ifdef CONFIG_PROC_SYSCTL
2219
2220 static int _proc_do_string(void* data, int maxlen, int write,
2221 struct file *filp, void __user *buffer,
2222 size_t *lenp, loff_t *ppos)
2223 {
2224 size_t len;
2225 char __user *p;
2226 char c;
2227
2228 if (!data || !maxlen || !*lenp) {
2229 *lenp = 0;
2230 return 0;
2231 }
2232
2233 if (write) {
2234 len = 0;
2235 p = buffer;
2236 while (len < *lenp) {
2237 if (get_user(c, p++))
2238 return -EFAULT;
2239 if (c == 0 || c == '\n')
2240 break;
2241 len++;
2242 }
2243 if (len >= maxlen)
2244 len = maxlen-1;
2245 if(copy_from_user(data, buffer, len))
2246 return -EFAULT;
2247 ((char *) data)[len] = 0;
2248 *ppos += *lenp;
2249 } else {
2250 len = strlen(data);
2251 if (len > maxlen)
2252 len = maxlen;
2253
2254 if (*ppos > len) {
2255 *lenp = 0;
2256 return 0;
2257 }
2258
2259 data += *ppos;
2260 len -= *ppos;
2261
2262 if (len > *lenp)
2263 len = *lenp;
2264 if (len)
2265 if(copy_to_user(buffer, data, len))
2266 return -EFAULT;
2267 if (len < *lenp) {
2268 if(put_user('\n', ((char __user *) buffer) + len))
2269 return -EFAULT;
2270 len++;
2271 }
2272 *lenp = len;
2273 *ppos += len;
2274 }
2275 return 0;
2276 }
2277
2278 /**
2279 * proc_dostring - read a string sysctl
2280 * @table: the sysctl table
2281 * @write: %TRUE if this is a write to the sysctl file
2282 * @filp: the file structure
2283 * @buffer: the user buffer
2284 * @lenp: the size of the user buffer
2285 * @ppos: file position
2286 *
2287 * Reads/writes a string from/to the user buffer. If the kernel
2288 * buffer provided is not large enough to hold the string, the
2289 * string is truncated. The copied string is %NULL-terminated.
2290 * If the string is being read by the user process, it is copied
2291 * and a newline '\n' is added. It is truncated if the buffer is
2292 * not large enough.
2293 *
2294 * Returns 0 on success.
2295 */
2296 int proc_dostring(struct ctl_table *table, int write, struct file *filp,
2297 void __user *buffer, size_t *lenp, loff_t *ppos)
2298 {
2299 return _proc_do_string(table->data, table->maxlen, write, filp,
2300 buffer, lenp, ppos);
2301 }
2302
2303
2304 static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp,
2305 int *valp,
2306 int write, void *data)
2307 {
2308 if (write) {
2309 *valp = *negp ? -*lvalp : *lvalp;
2310 } else {
2311 int val = *valp;
2312 if (val < 0) {
2313 *negp = -1;
2314 *lvalp = (unsigned long)-val;
2315 } else {
2316 *negp = 0;
2317 *lvalp = (unsigned long)val;
2318 }
2319 }
2320 return 0;
2321 }
2322
2323 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
2324 int write, struct file *filp, void __user *buffer,
2325 size_t *lenp, loff_t *ppos,
2326 int (*conv)(int *negp, unsigned long *lvalp, int *valp,
2327 int write, void *data),
2328 void *data)
2329 {
2330 #define TMPBUFLEN 21
2331 int *i, vleft, first = 1, neg;
2332 unsigned long lval;
2333 size_t left, len;
2334
2335 char buf[TMPBUFLEN], *p;
2336 char __user *s = buffer;
2337
2338 if (!tbl_data || !table->maxlen || !*lenp ||
2339 (*ppos && !write)) {
2340 *lenp = 0;
2341 return 0;
2342 }
2343
2344 i = (int *) tbl_data;
2345 vleft = table->maxlen / sizeof(*i);
2346 left = *lenp;
2347
2348 if (!conv)
2349 conv = do_proc_dointvec_conv;
2350
2351 for (; left && vleft--; i++, first=0) {
2352 if (write) {
2353 while (left) {
2354 char c;
2355 if (get_user(c, s))
2356 return -EFAULT;
2357 if (!isspace(c))
2358 break;
2359 left--;
2360 s++;
2361 }
2362 if (!left)
2363 break;
2364 neg = 0;
2365 len = left;
2366 if (len > sizeof(buf) - 1)
2367 len = sizeof(buf) - 1;
2368 if (copy_from_user(buf, s, len))
2369 return -EFAULT;
2370 buf[len] = 0;
2371 p = buf;
2372 if (*p == '-' && left > 1) {
2373 neg = 1;
2374 p++;
2375 }
2376 if (*p < '0' || *p > '9')
2377 break;
2378
2379 lval = simple_strtoul(p, &p, 0);
2380
2381 len = p-buf;
2382 if ((len < left) && *p && !isspace(*p))
2383 break;
2384 s += len;
2385 left -= len;
2386
2387 if (conv(&neg, &lval, i, 1, data))
2388 break;
2389 } else {
2390 p = buf;
2391 if (!first)
2392 *p++ = '\t';
2393
2394 if (conv(&neg, &lval, i, 0, data))
2395 break;
2396
2397 sprintf(p, "%s%lu", neg ? "-" : "", lval);
2398 len = strlen(buf);
2399 if (len > left)
2400 len = left;
2401 if(copy_to_user(s, buf, len))
2402 return -EFAULT;
2403 left -= len;
2404 s += len;
2405 }
2406 }
2407
2408 if (!write && !first && left) {
2409 if(put_user('\n', s))
2410 return -EFAULT;
2411 left--, s++;
2412 }
2413 if (write) {
2414 while (left) {
2415 char c;
2416 if (get_user(c, s++))
2417 return -EFAULT;
2418 if (!isspace(c))
2419 break;
2420 left--;
2421 }
2422 }
2423 if (write && first)
2424 return -EINVAL;
2425 *lenp -= left;
2426 *ppos += *lenp;
2427 return 0;
2428 #undef TMPBUFLEN
2429 }
2430
2431 static int do_proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2432 void __user *buffer, size_t *lenp, loff_t *ppos,
2433 int (*conv)(int *negp, unsigned long *lvalp, int *valp,
2434 int write, void *data),
2435 void *data)
2436 {
2437 return __do_proc_dointvec(table->data, table, write, filp,
2438 buffer, lenp, ppos, conv, data);
2439 }
2440
2441 /**
2442 * proc_dointvec - read a vector of integers
2443 * @table: the sysctl table
2444 * @write: %TRUE if this is a write to the sysctl file
2445 * @filp: the file structure
2446 * @buffer: the user buffer
2447 * @lenp: the size of the user buffer
2448 * @ppos: file position
2449 *
2450 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2451 * values from/to the user buffer, treated as an ASCII string.
2452 *
2453 * Returns 0 on success.
2454 */
2455 int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2456 void __user *buffer, size_t *lenp, loff_t *ppos)
2457 {
2458 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2459 NULL,NULL);
2460 }
2461
2462 /*
2463 * Taint values can only be increased
2464 * This means we can safely use a temporary.
2465 */
2466 static int proc_taint(struct ctl_table *table, int write, struct file *filp,
2467 void __user *buffer, size_t *lenp, loff_t *ppos)
2468 {
2469 struct ctl_table t;
2470 unsigned long tmptaint = get_taint();
2471 int err;
2472
2473 if (write && !capable(CAP_SYS_ADMIN))
2474 return -EPERM;
2475
2476 t = *table;
2477 t.data = &tmptaint;
2478 err = proc_doulongvec_minmax(&t, write, filp, buffer, lenp, ppos);
2479 if (err < 0)
2480 return err;
2481
2482 if (write) {
2483 /*
2484 * Poor man's atomic or. Not worth adding a primitive
2485 * to everyone's atomic.h for this
2486 */
2487 int i;
2488 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2489 if ((tmptaint >> i) & 1)
2490 add_taint(i);
2491 }
2492 }
2493
2494 return err;
2495 }
2496
2497 struct do_proc_dointvec_minmax_conv_param {
2498 int *min;
2499 int *max;
2500 };
2501
2502 static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp,
2503 int *valp,
2504 int write, void *data)
2505 {
2506 struct do_proc_dointvec_minmax_conv_param *param = data;
2507 if (write) {
2508 int val = *negp ? -*lvalp : *lvalp;
2509 if ((param->min && *param->min > val) ||
2510 (param->max && *param->max < val))
2511 return -EINVAL;
2512 *valp = val;
2513 } else {
2514 int val = *valp;
2515 if (val < 0) {
2516 *negp = -1;
2517 *lvalp = (unsigned long)-val;
2518 } else {
2519 *negp = 0;
2520 *lvalp = (unsigned long)val;
2521 }
2522 }
2523 return 0;
2524 }
2525
2526 /**
2527 * proc_dointvec_minmax - read a vector of integers with min/max values
2528 * @table: the sysctl table
2529 * @write: %TRUE if this is a write to the sysctl file
2530 * @filp: the file structure
2531 * @buffer: the user buffer
2532 * @lenp: the size of the user buffer
2533 * @ppos: file position
2534 *
2535 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2536 * values from/to the user buffer, treated as an ASCII string.
2537 *
2538 * This routine will ensure the values are within the range specified by
2539 * table->extra1 (min) and table->extra2 (max).
2540 *
2541 * Returns 0 on success.
2542 */
2543 int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
2544 void __user *buffer, size_t *lenp, loff_t *ppos)
2545 {
2546 struct do_proc_dointvec_minmax_conv_param param = {
2547 .min = (int *) table->extra1,
2548 .max = (int *) table->extra2,
2549 };
2550 return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2551 do_proc_dointvec_minmax_conv, &param);
2552 }
2553
2554 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2555 struct file *filp,
2556 void __user *buffer,
2557 size_t *lenp, loff_t *ppos,
2558 unsigned long convmul,
2559 unsigned long convdiv)
2560 {
2561 #define TMPBUFLEN 21
2562 unsigned long *i, *min, *max, val;
2563 int vleft, first=1, neg;
2564 size_t len, left;
2565 char buf[TMPBUFLEN], *p;
2566 char __user *s = buffer;
2567
2568 if (!data || !table->maxlen || !*lenp ||
2569 (*ppos && !write)) {
2570 *lenp = 0;
2571 return 0;
2572 }
2573
2574 i = (unsigned long *) data;
2575 min = (unsigned long *) table->extra1;
2576 max = (unsigned long *) table->extra2;
2577 vleft = table->maxlen / sizeof(unsigned long);
2578 left = *lenp;
2579
2580 for (; left && vleft--; i++, min++, max++, first=0) {
2581 if (write) {
2582 while (left) {
2583 char c;
2584 if (get_user(c, s))
2585 return -EFAULT;
2586 if (!isspace(c))
2587 break;
2588 left--;
2589 s++;
2590 }
2591 if (!left)
2592 break;
2593 neg = 0;
2594 len = left;
2595 if (len > TMPBUFLEN-1)
2596 len = TMPBUFLEN-1;
2597 if (copy_from_user(buf, s, len))
2598 return -EFAULT;
2599 buf[len] = 0;
2600 p = buf;
2601 if (*p == '-' && left > 1) {
2602 neg = 1;
2603 p++;
2604 }
2605 if (*p < '0' || *p > '9')
2606 break;
2607 val = simple_strtoul(p, &p, 0) * convmul / convdiv ;
2608 len = p-buf;
2609 if ((len < left) && *p && !isspace(*p))
2610 break;
2611 if (neg)
2612 val = -val;
2613 s += len;
2614 left -= len;
2615
2616 if(neg)
2617 continue;
2618 if ((min && val < *min) || (max && val > *max))
2619 continue;
2620 *i = val;
2621 } else {
2622 p = buf;
2623 if (!first)
2624 *p++ = '\t';
2625 sprintf(p, "%lu", convdiv * (*i) / convmul);
2626 len = strlen(buf);
2627 if (len > left)
2628 len = left;
2629 if(copy_to_user(s, buf, len))
2630 return -EFAULT;
2631 left -= len;
2632 s += len;
2633 }
2634 }
2635
2636 if (!write && !first && left) {
2637 if(put_user('\n', s))
2638 return -EFAULT;
2639 left--, s++;
2640 }
2641 if (write) {
2642 while (left) {
2643 char c;
2644 if (get_user(c, s++))
2645 return -EFAULT;
2646 if (!isspace(c))
2647 break;
2648 left--;
2649 }
2650 }
2651 if (write && first)
2652 return -EINVAL;
2653 *lenp -= left;
2654 *ppos += *lenp;
2655 return 0;
2656 #undef TMPBUFLEN
2657 }
2658
2659 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2660 struct file *filp,
2661 void __user *buffer,
2662 size_t *lenp, loff_t *ppos,
2663 unsigned long convmul,
2664 unsigned long convdiv)
2665 {
2666 return __do_proc_doulongvec_minmax(table->data, table, write,
2667 filp, buffer, lenp, ppos, convmul, convdiv);
2668 }
2669
2670 /**
2671 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2672 * @table: the sysctl table
2673 * @write: %TRUE if this is a write to the sysctl file
2674 * @filp: the file structure
2675 * @buffer: the user buffer
2676 * @lenp: the size of the user buffer
2677 * @ppos: file position
2678 *
2679 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2680 * values from/to the user buffer, treated as an ASCII string.
2681 *
2682 * This routine will ensure the values are within the range specified by
2683 * table->extra1 (min) and table->extra2 (max).
2684 *
2685 * Returns 0 on success.
2686 */
2687 int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
2688 void __user *buffer, size_t *lenp, loff_t *ppos)
2689 {
2690 return do_proc_doulongvec_minmax(table, write, filp, buffer, lenp, ppos, 1l, 1l);
2691 }
2692
2693 /**
2694 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2695 * @table: the sysctl table
2696 * @write: %TRUE if this is a write to the sysctl file
2697 * @filp: the file structure
2698 * @buffer: the user buffer
2699 * @lenp: the size of the user buffer
2700 * @ppos: file position
2701 *
2702 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2703 * values from/to the user buffer, treated as an ASCII string. The values
2704 * are treated as milliseconds, and converted to jiffies when they are stored.
2705 *
2706 * This routine will ensure the values are within the range specified by
2707 * table->extra1 (min) and table->extra2 (max).
2708 *
2709 * Returns 0 on success.
2710 */
2711 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2712 struct file *filp,
2713 void __user *buffer,
2714 size_t *lenp, loff_t *ppos)
2715 {
2716 return do_proc_doulongvec_minmax(table, write, filp, buffer,
2717 lenp, ppos, HZ, 1000l);
2718 }
2719
2720
2721 static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp,
2722 int *valp,
2723 int write, void *data)
2724 {
2725 if (write) {
2726 if (*lvalp > LONG_MAX / HZ)
2727 return 1;
2728 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2729 } else {
2730 int val = *valp;
2731 unsigned long lval;
2732 if (val < 0) {
2733 *negp = -1;
2734 lval = (unsigned long)-val;
2735 } else {
2736 *negp = 0;
2737 lval = (unsigned long)val;
2738 }
2739 *lvalp = lval / HZ;
2740 }
2741 return 0;
2742 }
2743
2744 static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp,
2745 int *valp,
2746 int write, void *data)
2747 {
2748 if (write) {
2749 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2750 return 1;
2751 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2752 } else {
2753 int val = *valp;
2754 unsigned long lval;
2755 if (val < 0) {
2756 *negp = -1;
2757 lval = (unsigned long)-val;
2758 } else {
2759 *negp = 0;
2760 lval = (unsigned long)val;
2761 }
2762 *lvalp = jiffies_to_clock_t(lval);
2763 }
2764 return 0;
2765 }
2766
2767 static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp,
2768 int *valp,
2769 int write, void *data)
2770 {
2771 if (write) {
2772 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2773 } else {
2774 int val = *valp;
2775 unsigned long lval;
2776 if (val < 0) {
2777 *negp = -1;
2778 lval = (unsigned long)-val;
2779 } else {
2780 *negp = 0;
2781 lval = (unsigned long)val;
2782 }
2783 *lvalp = jiffies_to_msecs(lval);
2784 }
2785 return 0;
2786 }
2787
2788 /**
2789 * proc_dointvec_jiffies - read a vector of integers as seconds
2790 * @table: the sysctl table
2791 * @write: %TRUE if this is a write to the sysctl file
2792 * @filp: the file structure
2793 * @buffer: the user buffer
2794 * @lenp: the size of the user buffer
2795 * @ppos: file position
2796 *
2797 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2798 * values from/to the user buffer, treated as an ASCII string.
2799 * The values read are assumed to be in seconds, and are converted into
2800 * jiffies.
2801 *
2802 * Returns 0 on success.
2803 */
2804 int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
2805 void __user *buffer, size_t *lenp, loff_t *ppos)
2806 {
2807 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2808 do_proc_dointvec_jiffies_conv,NULL);
2809 }
2810
2811 /**
2812 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2813 * @table: the sysctl table
2814 * @write: %TRUE if this is a write to the sysctl file
2815 * @filp: the file structure
2816 * @buffer: the user buffer
2817 * @lenp: the size of the user buffer
2818 * @ppos: pointer to the file position
2819 *
2820 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2821 * values from/to the user buffer, treated as an ASCII string.
2822 * The values read are assumed to be in 1/USER_HZ seconds, and
2823 * are converted into jiffies.
2824 *
2825 * Returns 0 on success.
2826 */
2827 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
2828 void __user *buffer, size_t *lenp, loff_t *ppos)
2829 {
2830 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2831 do_proc_dointvec_userhz_jiffies_conv,NULL);
2832 }
2833
2834 /**
2835 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2836 * @table: the sysctl table
2837 * @write: %TRUE if this is a write to the sysctl file
2838 * @filp: the file structure
2839 * @buffer: the user buffer
2840 * @lenp: the size of the user buffer
2841 * @ppos: file position
2842 * @ppos: the current position in the file
2843 *
2844 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2845 * values from/to the user buffer, treated as an ASCII string.
2846 * The values read are assumed to be in 1/1000 seconds, and
2847 * are converted into jiffies.
2848 *
2849 * Returns 0 on success.
2850 */
2851 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
2852 void __user *buffer, size_t *lenp, loff_t *ppos)
2853 {
2854 return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2855 do_proc_dointvec_ms_jiffies_conv, NULL);
2856 }
2857
2858 static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
2859 void __user *buffer, size_t *lenp, loff_t *ppos)
2860 {
2861 struct pid *new_pid;
2862 pid_t tmp;
2863 int r;
2864
2865 tmp = pid_vnr(cad_pid);
2866
2867 r = __do_proc_dointvec(&tmp, table, write, filp, buffer,
2868 lenp, ppos, NULL, NULL);
2869 if (r || !write)
2870 return r;
2871
2872 new_pid = find_get_pid(tmp);
2873 if (!new_pid)
2874 return -ESRCH;
2875
2876 put_pid(xchg(&cad_pid, new_pid));
2877 return 0;
2878 }
2879
2880 #else /* CONFIG_PROC_FS */
2881
2882 int proc_dostring(struct ctl_table *table, int write, struct file *filp,
2883 void __user *buffer, size_t *lenp, loff_t *ppos)
2884 {
2885 return -ENOSYS;
2886 }
2887
2888 int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2889 void __user *buffer, size_t *lenp, loff_t *ppos)
2890 {
2891 return -ENOSYS;
2892 }
2893
2894 int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
2895 void __user *buffer, size_t *lenp, loff_t *ppos)
2896 {
2897 return -ENOSYS;
2898 }
2899
2900 int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
2901 void __user *buffer, size_t *lenp, loff_t *ppos)
2902 {
2903 return -ENOSYS;
2904 }
2905
2906 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
2907 void __user *buffer, size_t *lenp, loff_t *ppos)
2908 {
2909 return -ENOSYS;
2910 }
2911
2912 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
2913 void __user *buffer, size_t *lenp, loff_t *ppos)
2914 {
2915 return -ENOSYS;
2916 }
2917
2918 int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
2919 void __user *buffer, size_t *lenp, loff_t *ppos)
2920 {
2921 return -ENOSYS;
2922 }
2923
2924 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2925 struct file *filp,
2926 void __user *buffer,
2927 size_t *lenp, loff_t *ppos)
2928 {
2929 return -ENOSYS;
2930 }
2931
2932
2933 #endif /* CONFIG_PROC_FS */
2934
2935
2936 #ifdef CONFIG_SYSCTL_SYSCALL
2937 /*
2938 * General sysctl support routines
2939 */
2940
2941 /* The generic sysctl data routine (used if no strategy routine supplied) */
2942 int sysctl_data(struct ctl_table *table,
2943 void __user *oldval, size_t __user *oldlenp,
2944 void __user *newval, size_t newlen)
2945 {
2946 size_t len;
2947
2948 /* Get out of I don't have a variable */
2949 if (!table->data || !table->maxlen)
2950 return -ENOTDIR;
2951
2952 if (oldval && oldlenp) {
2953 if (get_user(len, oldlenp))
2954 return -EFAULT;
2955 if (len) {
2956 if (len > table->maxlen)
2957 len = table->maxlen;
2958 if (copy_to_user(oldval, table->data, len))
2959 return -EFAULT;
2960 if (put_user(len, oldlenp))
2961 return -EFAULT;
2962 }
2963 }
2964
2965 if (newval && newlen) {
2966 if (newlen > table->maxlen)
2967 newlen = table->maxlen;
2968
2969 if (copy_from_user(table->data, newval, newlen))
2970 return -EFAULT;
2971 }
2972 return 1;
2973 }
2974
2975 /* The generic string strategy routine: */
2976 int sysctl_string(struct ctl_table *table,
2977 void __user *oldval, size_t __user *oldlenp,
2978 void __user *newval, size_t newlen)
2979 {
2980 if (!table->data || !table->maxlen)
2981 return -ENOTDIR;
2982
2983 if (oldval && oldlenp) {
2984 size_t bufsize;
2985 if (get_user(bufsize, oldlenp))
2986 return -EFAULT;
2987 if (bufsize) {
2988 size_t len = strlen(table->data), copied;
2989
2990 /* This shouldn't trigger for a well-formed sysctl */
2991 if (len > table->maxlen)
2992 len = table->maxlen;
2993
2994 /* Copy up to a max of bufsize-1 bytes of the string */
2995 copied = (len >= bufsize) ? bufsize - 1 : len;
2996
2997 if (copy_to_user(oldval, table->data, copied) ||
2998 put_user(0, (char __user *)(oldval + copied)))
2999 return -EFAULT;
3000 if (put_user(len, oldlenp))
3001 return -EFAULT;
3002 }
3003 }
3004 if (newval && newlen) {
3005 size_t len = newlen;
3006 if (len > table->maxlen)
3007 len = table->maxlen;
3008 if(copy_from_user(table->data, newval, len))
3009 return -EFAULT;
3010 if (len == table->maxlen)
3011 len--;
3012 ((char *) table->data)[len] = 0;
3013 }
3014 return 1;
3015 }
3016
3017 /*
3018 * This function makes sure that all of the integers in the vector
3019 * are between the minimum and maximum values given in the arrays
3020 * table->extra1 and table->extra2, respectively.
3021 */
3022 int sysctl_intvec(struct ctl_table *table,
3023 void __user *oldval, size_t __user *oldlenp,
3024 void __user *newval, size_t newlen)
3025 {
3026
3027 if (newval && newlen) {
3028 int __user *vec = (int __user *) newval;
3029 int *min = (int *) table->extra1;
3030 int *max = (int *) table->extra2;
3031 size_t length;
3032 int i;
3033
3034 if (newlen % sizeof(int) != 0)
3035 return -EINVAL;
3036
3037 if (!table->extra1 && !table->extra2)
3038 return 0;
3039
3040 if (newlen > table->maxlen)
3041 newlen = table->maxlen;
3042 length = newlen / sizeof(int);
3043
3044 for (i = 0; i < length; i++) {
3045 int value;
3046 if (get_user(value, vec + i))
3047 return -EFAULT;
3048 if (min && value < min[i])
3049 return -EINVAL;
3050 if (max && value > max[i])
3051 return -EINVAL;
3052 }
3053 }
3054 return 0;
3055 }
3056
3057 /* Strategy function to convert jiffies to seconds */
3058 int sysctl_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 = *(int *)(table->data) / HZ;
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) = new*HZ;
3087 }
3088 return 1;
3089 }
3090
3091 /* Strategy function to convert jiffies to seconds */
3092 int sysctl_ms_jiffies(struct ctl_table *table,
3093 void __user *oldval, size_t __user *oldlenp,
3094 void __user *newval, size_t newlen)
3095 {
3096 if (oldval && oldlenp) {
3097 size_t olen;
3098
3099 if (get_user(olen, oldlenp))
3100 return -EFAULT;
3101 if (olen) {
3102 int val;
3103
3104 if (olen < sizeof(int))
3105 return -EINVAL;
3106
3107 val = jiffies_to_msecs(*(int *)(table->data));
3108 if (put_user(val, (int __user *)oldval))
3109 return -EFAULT;
3110 if (put_user(sizeof(int), oldlenp))
3111 return -EFAULT;
3112 }
3113 }
3114 if (newval && newlen) {
3115 int new;
3116 if (newlen != sizeof(int))
3117 return -EINVAL;
3118 if (get_user(new, (int __user *)newval))
3119 return -EFAULT;
3120 *(int *)(table->data) = msecs_to_jiffies(new);
3121 }
3122 return 1;
3123 }
3124
3125
3126
3127 #else /* CONFIG_SYSCTL_SYSCALL */
3128
3129
3130 SYSCALL_DEFINE1(sysctl, struct __sysctl_args __user *, args)
3131 {
3132 struct __sysctl_args tmp;
3133 int error;
3134
3135 if (copy_from_user(&tmp, args, sizeof(tmp)))
3136 return -EFAULT;
3137
3138 error = deprecated_sysctl_warning(&tmp);
3139
3140 /* If no error reading the parameters then just -ENOSYS ... */
3141 if (!error)
3142 error = -ENOSYS;
3143
3144 return error;
3145 }
3146
3147 int sysctl_data(struct ctl_table *table,
3148 void __user *oldval, size_t __user *oldlenp,
3149 void __user *newval, size_t newlen)
3150 {
3151 return -ENOSYS;
3152 }
3153
3154 int sysctl_string(struct ctl_table *table,
3155 void __user *oldval, size_t __user *oldlenp,
3156 void __user *newval, size_t newlen)
3157 {
3158 return -ENOSYS;
3159 }
3160
3161 int sysctl_intvec(struct ctl_table *table,
3162 void __user *oldval, size_t __user *oldlenp,
3163 void __user *newval, size_t newlen)
3164 {
3165 return -ENOSYS;
3166 }
3167
3168 int sysctl_jiffies(struct ctl_table *table,
3169 void __user *oldval, size_t __user *oldlenp,
3170 void __user *newval, size_t newlen)
3171 {
3172 return -ENOSYS;
3173 }
3174
3175 int sysctl_ms_jiffies(struct ctl_table *table,
3176 void __user *oldval, size_t __user *oldlenp,
3177 void __user *newval, size_t newlen)
3178 {
3179 return -ENOSYS;
3180 }
3181
3182 #endif /* CONFIG_SYSCTL_SYSCALL */
3183
3184 static int deprecated_sysctl_warning(struct __sysctl_args *args)
3185 {
3186 static int msg_count;
3187 int name[CTL_MAXNAME];
3188 int i;
3189
3190 /* Check args->nlen. */
3191 if (args->nlen < 0 || args->nlen > CTL_MAXNAME)
3192 return -ENOTDIR;
3193
3194 /* Read in the sysctl name for better debug message logging */
3195 for (i = 0; i < args->nlen; i++)
3196 if (get_user(name[i], args->name + i))
3197 return -EFAULT;
3198
3199 /* Ignore accesses to kernel.version */
3200 if ((args->nlen == 2) && (name[0] == CTL_KERN) && (name[1] == KERN_VERSION))
3201 return 0;
3202
3203 if (msg_count < 5) {
3204 msg_count++;
3205 printk(KERN_INFO
3206 "warning: process `%s' used the deprecated sysctl "
3207 "system call with ", current->comm);
3208 for (i = 0; i < args->nlen; i++)
3209 printk("%d.", name[i]);
3210 printk("\n");
3211 }
3212 return 0;
3213 }
3214
3215 /*
3216 * No sense putting this after each symbol definition, twice,
3217 * exception granted :-)
3218 */
3219 EXPORT_SYMBOL(proc_dointvec);
3220 EXPORT_SYMBOL(proc_dointvec_jiffies);
3221 EXPORT_SYMBOL(proc_dointvec_minmax);
3222 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
3223 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
3224 EXPORT_SYMBOL(proc_dostring);
3225 EXPORT_SYMBOL(proc_doulongvec_minmax);
3226 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
3227 EXPORT_SYMBOL(register_sysctl_table);
3228 EXPORT_SYMBOL(register_sysctl_paths);
3229 EXPORT_SYMBOL(sysctl_intvec);
3230 EXPORT_SYMBOL(sysctl_jiffies);
3231 EXPORT_SYMBOL(sysctl_ms_jiffies);
3232 EXPORT_SYMBOL(sysctl_string);
3233 EXPORT_SYMBOL(sysctl_data);
3234 EXPORT_SYMBOL(unregister_sysctl_table);
Linux kernel - Deliverables
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