1 /*
2 * sysctl.c: General linux system control interface
3 *
4 * Begun 24 March 1995, Stephen Tweedie
5 * Added /proc support, Dec 1995
6 * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas.
7 * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver.
8 * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver.
9 * Dynamic registration fixes, Stephen Tweedie.
10 * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn.
11 * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris
12 * Horn.
13 * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer.
14 * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer.
15 * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill
16 * Wendling.
17 * The list_for_each() macro wasn't appropriate for the sysctl loop.
18 * Removed it and replaced it with older style, 03/23/00, Bill Wendling
19 */
20
21 #include <linux/module.h>
22 #include <linux/mm.h>
23 #include <linux/swap.h>
24 #include <linux/slab.h>
25 #include <linux/sysctl.h>
26 #include <linux/proc_fs.h>
27 #include <linux/security.h>
28 #include <linux/ctype.h>
29 #include <linux/utsname.h>
30 #include <linux/smp_lock.h>
31 #include <linux/fs.h>
32 #include <linux/init.h>
33 #include <linux/kernel.h>
34 #include <linux/kobject.h>
35 #include <linux/net.h>
36 #include <linux/sysrq.h>
37 #include <linux/highuid.h>
38 #include <linux/writeback.h>
39 #include <linux/hugetlb.h>
40 #include <linux/initrd.h>
41 #include <linux/times.h>
42 #include <linux/limits.h>
43 #include <linux/dcache.h>
44 #include <linux/syscalls.h>
45 #include <linux/nfs_fs.h>
46 #include <linux/acpi.h>
47 #include <linux/reboot.h>
48 #include <linux/ftrace.h>
49 #include <linux/profile.h>
50
51 #include <asm/uaccess.h>
52 #include <asm/processor.h>
53
54 #ifdef CONFIG_X86
55 #include <asm/nmi.h>
56 #include <asm/stacktrace.h>
57 #include <asm/io.h>
58 #endif
59
60 static int deprecated_sysctl_warning(struct __sysctl_args *args);
61
62 #if defined(CONFIG_SYSCTL)
63
64 /* External variables not in a header file. */
65 extern int C_A_D;
66 extern int print_fatal_signals;
67 extern int sysctl_overcommit_memory;
68 extern int sysctl_overcommit_ratio;
69 extern int sysctl_panic_on_oom;
70 extern int sysctl_oom_kill_allocating_task;
71 extern int sysctl_oom_dump_tasks;
72 extern int futex_performance_hack;
73 extern int max_threads;
74 extern int core_uses_pid;
75 extern int suid_dumpable;
76 extern char core_pattern[];
77 extern int pid_max;
78 extern int min_free_kbytes;
79 extern int pid_max_min, pid_max_max;
80 extern int sysctl_drop_caches;
81 extern int percpu_pagelist_fraction;
82 extern int compat_log;
83 extern int maps_protect;
84 extern int sysctl_stat_interval;
85 extern int latencytop_enabled;
86
87 /* Constants used for minimum and maximum */
88 #if defined(CONFIG_DETECT_SOFTLOCKUP) || defined(CONFIG_HIGHMEM)
89 static int one = 1;
90 #endif
91
92 #ifdef CONFIG_DETECT_SOFTLOCKUP
93 static int sixty = 60;
94 #endif
95
96 #ifdef CONFIG_MMU
97 static int two = 2;
98 #endif
99
100 static int zero;
101 static int one_hundred = 100;
102
103 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
104 static int maxolduid = 65535;
105 static int minolduid;
106 static int min_percpu_pagelist_fract = 8;
107
108 static int ngroups_max = NGROUPS_MAX;
109
110 #ifdef CONFIG_KMOD
111 extern char modprobe_path[];
112 #endif
113 #ifdef CONFIG_CHR_DEV_SG
114 extern int sg_big_buff;
115 #endif
116
117 #ifdef __sparc__
118 extern char reboot_command [];
119 extern int stop_a_enabled;
120 extern int scons_pwroff;
121 #endif
122
123 #ifdef __hppa__
124 extern int pwrsw_enabled;
125 extern int unaligned_enabled;
126 #endif
127
128 #ifdef CONFIG_S390
129 #ifdef CONFIG_MATHEMU
130 extern int sysctl_ieee_emulation_warnings;
131 #endif
132 extern int sysctl_userprocess_debug;
133 extern int spin_retry;
134 #endif
135
136 extern int sysctl_hz_timer;
137
138 #ifdef CONFIG_BSD_PROCESS_ACCT
139 extern int acct_parm[];
140 #endif
141
142 #ifdef CONFIG_IA64
143 extern int no_unaligned_warning;
144 #endif
145
146 #ifdef CONFIG_RT_MUTEXES
147 extern int max_lock_depth;
148 #endif
149
150 #ifdef CONFIG_SYSCTL_SYSCALL
151 static int parse_table(int __user *, int, void __user *, size_t __user *,
152 void __user *, size_t, struct ctl_table *);
153 #endif
154
155 #ifdef CONFIG_PREEMPT_RT
156 extern int rt_rwlock_limit;
157 #endif
158
159
160 #ifdef CONFIG_PROC_SYSCTL
161 static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
162 void __user *buffer, size_t *lenp, loff_t *ppos);
163 static int proc_dointvec_taint(struct ctl_table *table, int write, struct file *filp,
164 void __user *buffer, size_t *lenp, loff_t *ppos);
165 #endif
166
167 static struct ctl_table root_table[];
168 static struct ctl_table_root sysctl_table_root;
169 static struct ctl_table_header root_table_header = {
170 .ctl_table = root_table,
171 .ctl_entry = LIST_HEAD_INIT(sysctl_table_root.header_list),
172 .root = &sysctl_table_root,
173 };
174 static struct ctl_table_root sysctl_table_root = {
175 .root_list = LIST_HEAD_INIT(sysctl_table_root.root_list),
176 .header_list = LIST_HEAD_INIT(root_table_header.ctl_entry),
177 };
178
179 static struct ctl_table kern_table[];
180 static struct ctl_table vm_table[];
181 static struct ctl_table fs_table[];
182 static struct ctl_table debug_table[];
183 static struct ctl_table dev_table[];
184 extern struct ctl_table random_table[];
185 #ifdef CONFIG_INOTIFY_USER
186 extern struct ctl_table inotify_table[];
187 #endif
188
189 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
190 int sysctl_legacy_va_layout;
191 #endif
192
193 extern int prove_locking;
194 extern int lock_stat;
195
196 /* The default sysctl tables: */
197
198 static struct ctl_table root_table[] = {
199 {
200 .ctl_name = CTL_KERN,
201 .procname = "kernel",
202 .mode = 0555,
203 .child = kern_table,
204 },
205 {
206 .ctl_name = CTL_VM,
207 .procname = "vm",
208 .mode = 0555,
209 .child = vm_table,
210 },
211 {
212 .ctl_name = CTL_FS,
213 .procname = "fs",
214 .mode = 0555,
215 .child = fs_table,
216 },
217 {
218 .ctl_name = CTL_DEBUG,
219 .procname = "debug",
220 .mode = 0555,
221 .child = debug_table,
222 },
223 {
224 .ctl_name = CTL_DEV,
225 .procname = "dev",
226 .mode = 0555,
227 .child = dev_table,
228 },
229 /*
230 * NOTE: do not add new entries to this table unless you have read
231 * Documentation/sysctl/ctl_unnumbered.txt
232 */
233 { .ctl_name = 0 }
234 };
235
236 #ifdef CONFIG_SCHED_DEBUG
237 static int min_sched_granularity_ns = 100000; /* 100 usecs */
238 static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */
239 static int min_wakeup_granularity_ns; /* 0 usecs */
240 static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */
241 #endif
242
243 static struct ctl_table kern_table[] = {
244 #ifdef CONFIG_SCHED_DEBUG
245 {
246 .ctl_name = CTL_UNNUMBERED,
247 .procname = "sched_min_granularity_ns",
248 .data = &sysctl_sched_min_granularity,
249 .maxlen = sizeof(unsigned int),
250 .mode = 0644,
251 .proc_handler = &sched_nr_latency_handler,
252 .strategy = &sysctl_intvec,
253 .extra1 = &min_sched_granularity_ns,
254 .extra2 = &max_sched_granularity_ns,
255 },
256 {
257 .ctl_name = CTL_UNNUMBERED,
258 .procname = "sched_latency_ns",
259 .data = &sysctl_sched_latency,
260 .maxlen = sizeof(unsigned int),
261 .mode = 0644,
262 .proc_handler = &sched_nr_latency_handler,
263 .strategy = &sysctl_intvec,
264 .extra1 = &min_sched_granularity_ns,
265 .extra2 = &max_sched_granularity_ns,
266 },
267 {
268 .ctl_name = CTL_UNNUMBERED,
269 .procname = "sched_wakeup_granularity_ns",
270 .data = &sysctl_sched_wakeup_granularity,
271 .maxlen = sizeof(unsigned int),
272 .mode = 0644,
273 .proc_handler = &proc_dointvec_minmax,
274 .strategy = &sysctl_intvec,
275 .extra1 = &min_wakeup_granularity_ns,
276 .extra2 = &max_wakeup_granularity_ns,
277 },
278 {
279 .ctl_name = CTL_UNNUMBERED,
280 .procname = "sched_batch_wakeup_granularity_ns",
281 .data = &sysctl_sched_batch_wakeup_granularity,
282 .maxlen = sizeof(unsigned int),
283 .mode = 0644,
284 .proc_handler = &proc_dointvec_minmax,
285 .strategy = &sysctl_intvec,
286 .extra1 = &min_wakeup_granularity_ns,
287 .extra2 = &max_wakeup_granularity_ns,
288 },
289 {
290 .ctl_name = CTL_UNNUMBERED,
291 .procname = "sched_child_runs_first",
292 .data = &sysctl_sched_child_runs_first,
293 .maxlen = sizeof(unsigned int),
294 .mode = 0644,
295 .proc_handler = &proc_dointvec,
296 },
297 {
298 .ctl_name = CTL_UNNUMBERED,
299 .procname = "sched_features",
300 .data = &sysctl_sched_features,
301 .maxlen = sizeof(unsigned int),
302 .mode = 0644,
303 .proc_handler = &proc_dointvec,
304 },
305 {
306 .ctl_name = CTL_UNNUMBERED,
307 .procname = "sched_migration_cost",
308 .data = &sysctl_sched_migration_cost,
309 .maxlen = sizeof(unsigned int),
310 .mode = 0644,
311 .proc_handler = &proc_dointvec,
312 },
313 {
314 .ctl_name = CTL_UNNUMBERED,
315 .procname = "sched_nr_migrate",
316 .data = &sysctl_sched_nr_migrate,
317 .maxlen = sizeof(unsigned int),
318 .mode = 0644,
319 .proc_handler = &proc_dointvec,
320 },
321 #endif
322 {
323 .ctl_name = CTL_UNNUMBERED,
324 .procname = "sched_rt_period_us",
325 .data = &sysctl_sched_rt_period,
326 .maxlen = sizeof(unsigned int),
327 .mode = 0644,
328 .proc_handler = &proc_dointvec,
329 },
330 {
331 .ctl_name = CTL_UNNUMBERED,
332 .procname = "sched_rt_runtime_us",
333 .data = &sysctl_sched_rt_runtime,
334 .maxlen = sizeof(int),
335 .mode = 0644,
336 .proc_handler = &proc_dointvec,
337 },
338 {
339 .ctl_name = CTL_UNNUMBERED,
340 .procname = "sched_compat_yield",
341 .data = &sysctl_sched_compat_yield,
342 .maxlen = sizeof(unsigned int),
343 .mode = 0644,
344 .proc_handler = &proc_dointvec,
345 },
346 #ifdef CONFIG_PROVE_LOCKING
347 {
348 .ctl_name = CTL_UNNUMBERED,
349 .procname = "prove_locking",
350 .data = &prove_locking,
351 .maxlen = sizeof(int),
352 .mode = 0644,
353 .proc_handler = &proc_dointvec,
354 },
355 #endif
356 #ifdef CONFIG_LOCK_STAT
357 {
358 .ctl_name = CTL_UNNUMBERED,
359 .procname = "lock_stat",
360 .data = &lock_stat,
361 .maxlen = sizeof(int),
362 .mode = 0644,
363 .proc_handler = &proc_dointvec,
364 },
365 #endif
366 #ifdef CONFIG_FUTEX
367 {
368 .ctl_name = CTL_UNNUMBERED,
369 .procname = "futex_performance_hack",
370 .data = &futex_performance_hack,
371 .maxlen = sizeof(int),
372 .mode = 0644,
373 .proc_handler = &proc_dointvec,
374 },
375 #endif
376 {
377 .ctl_name = CTL_UNNUMBERED,
378 .procname = "prof_pid",
379 .data = &prof_pid,
380 .maxlen = sizeof(int),
381 .mode = 0644,
382 .proc_handler = &proc_dointvec,
383 },
384 #ifdef CONFIG_PREEMPT
385 {
386 .ctl_name = CTL_UNNUMBERED,
387 .procname = "kernel_preemption",
388 .data = &kernel_preemption,
389 .maxlen = sizeof(int),
390 .mode = 0644,
391 .proc_handler = &proc_dointvec,
392 },
393 #endif
394 #ifdef CONFIG_PREEMPT_VOLUNTARY
395 {
396 .ctl_name = CTL_UNNUMBERED,
397 .procname = "voluntary_preemption",
398 .data = &voluntary_preemption,
399 .maxlen = sizeof(int),
400 .mode = 0644,
401 .proc_handler = &proc_dointvec,
402 },
403 #endif
404 #if defined(CONFIG_PREEMPT_SOFTIRQS) && !defined(CONFIG_PREEMPT_RT)
405 {
406 .ctl_name = CTL_UNNUMBERED,
407 .procname = "softirq_preemption",
408 .data = &softirq_preemption,
409 .maxlen = sizeof(int),
410 .mode = 0644,
411 .proc_handler = &proc_dointvec,
412 },
413 #endif
414 #if defined(CONFIG_PREEMPT_HARDIRQS) && !defined(CONFIG_PREEMPT_RT)
415 {
416 .ctl_name = CTL_UNNUMBERED,
417 .procname = "hardirq_preemption",
418 .data = &hardirq_preemption,
419 .maxlen = sizeof(int),
420 .mode = 0644,
421 .proc_handler = &proc_dointvec,
422 },
423 #endif
424 #ifdef CONFIG_PREEMPT_RT
425 {
426 .ctl_name = CTL_UNNUMBERED,
427 .procname = "rwlock_reader_limit",
428 .data = &rt_rwlock_limit,
429 .maxlen = sizeof(int),
430 .mode = 0644,
431 .proc_handler = &proc_dointvec,
432 },
433 #endif
434 {
435 .ctl_name = KERN_PANIC,
436 .procname = "panic",
437 .data = &panic_timeout,
438 .maxlen = sizeof(int),
439 .mode = 0644,
440 .proc_handler = &proc_dointvec,
441 },
442 #ifdef CONFIG_GENERIC_HARDIRQS
443 {
444 .ctl_name = CTL_UNNUMBERED,
445 .procname = "debug_direct_keyboard",
446 .data = &debug_direct_keyboard,
447 .maxlen = sizeof(int),
448 .mode = 0644,
449 .proc_handler = &proc_dointvec,
450 },
451 #endif
452 {
453 .ctl_name = KERN_CORE_USES_PID,
454 .procname = "core_uses_pid",
455 .data = &core_uses_pid,
456 .maxlen = sizeof(int),
457 .mode = 0644,
458 .proc_handler = &proc_dointvec,
459 },
460 {
461 .ctl_name = KERN_CORE_PATTERN,
462 .procname = "core_pattern",
463 .data = core_pattern,
464 .maxlen = CORENAME_MAX_SIZE,
465 .mode = 0644,
466 .proc_handler = &proc_dostring,
467 .strategy = &sysctl_string,
468 },
469 #ifdef CONFIG_PROC_SYSCTL
470 {
471 .procname = "tainted",
472 .data = &tainted,
473 .maxlen = sizeof(int),
474 .mode = 0644,
475 .proc_handler = &proc_dointvec_taint,
476 },
477 #endif
478 #ifdef CONFIG_LATENCYTOP
479 {
480 .procname = "latencytop",
481 .data = &latencytop_enabled,
482 .maxlen = sizeof(int),
483 .mode = 0644,
484 .proc_handler = &proc_dointvec,
485 },
486 #endif
487 #ifdef CONFIG_BLK_DEV_INITRD
488 {
489 .ctl_name = KERN_REALROOTDEV,
490 .procname = "real-root-dev",
491 .data = &real_root_dev,
492 .maxlen = sizeof(int),
493 .mode = 0644,
494 .proc_handler = &proc_dointvec,
495 },
496 #endif
497 {
498 .ctl_name = CTL_UNNUMBERED,
499 .procname = "print-fatal-signals",
500 .data = &print_fatal_signals,
501 .maxlen = sizeof(int),
502 .mode = 0644,
503 .proc_handler = &proc_dointvec,
504 },
505 #ifdef __sparc__
506 {
507 .ctl_name = KERN_SPARC_REBOOT,
508 .procname = "reboot-cmd",
509 .data = reboot_command,
510 .maxlen = 256,
511 .mode = 0644,
512 .proc_handler = &proc_dostring,
513 .strategy = &sysctl_string,
514 },
515 {
516 .ctl_name = KERN_SPARC_STOP_A,
517 .procname = "stop-a",
518 .data = &stop_a_enabled,
519 .maxlen = sizeof (int),
520 .mode = 0644,
521 .proc_handler = &proc_dointvec,
522 },
523 {
524 .ctl_name = KERN_SPARC_SCONS_PWROFF,
525 .procname = "scons-poweroff",
526 .data = &scons_pwroff,
527 .maxlen = sizeof (int),
528 .mode = 0644,
529 .proc_handler = &proc_dointvec,
530 },
531 #endif
532 #ifdef __hppa__
533 {
534 .ctl_name = KERN_HPPA_PWRSW,
535 .procname = "soft-power",
536 .data = &pwrsw_enabled,
537 .maxlen = sizeof (int),
538 .mode = 0644,
539 .proc_handler = &proc_dointvec,
540 },
541 {
542 .ctl_name = KERN_HPPA_UNALIGNED,
543 .procname = "unaligned-trap",
544 .data = &unaligned_enabled,
545 .maxlen = sizeof (int),
546 .mode = 0644,
547 .proc_handler = &proc_dointvec,
548 },
549 #endif
550 {
551 .ctl_name = KERN_CTLALTDEL,
552 .procname = "ctrl-alt-del",
553 .data = &C_A_D,
554 .maxlen = sizeof(int),
555 .mode = 0644,
556 .proc_handler = &proc_dointvec,
557 },
558 #ifdef CONFIG_FTRACE
559 {
560 .ctl_name = CTL_UNNUMBERED,
561 .procname = "ftrace_enabled",
562 .data = &ftrace_enabled,
563 .maxlen = sizeof(int),
564 .mode = 0644,
565 .proc_handler = &ftrace_enable_sysctl,
566 },
567 #endif
568 #ifdef CONFIG_KMOD
569 {
570 .ctl_name = KERN_MODPROBE,
571 .procname = "modprobe",
572 .data = &modprobe_path,
573 .maxlen = KMOD_PATH_LEN,
574 .mode = 0644,
575 .proc_handler = &proc_dostring,
576 .strategy = &sysctl_string,
577 },
578 #endif
579 #if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET)
580 {
581 .ctl_name = KERN_HOTPLUG,
582 .procname = "hotplug",
583 .data = &uevent_helper,
584 .maxlen = UEVENT_HELPER_PATH_LEN,
585 .mode = 0644,
586 .proc_handler = &proc_dostring,
587 .strategy = &sysctl_string,
588 },
589 #endif
590 #ifdef CONFIG_CHR_DEV_SG
591 {
592 .ctl_name = KERN_SG_BIG_BUFF,
593 .procname = "sg-big-buff",
594 .data = &sg_big_buff,
595 .maxlen = sizeof (int),
596 .mode = 0444,
597 .proc_handler = &proc_dointvec,
598 },
599 #endif
600 #ifdef CONFIG_BSD_PROCESS_ACCT
601 {
602 .ctl_name = KERN_ACCT,
603 .procname = "acct",
604 .data = &acct_parm,
605 .maxlen = 3*sizeof(int),
606 .mode = 0644,
607 .proc_handler = &proc_dointvec,
608 },
609 #endif
610 #ifdef CONFIG_MAGIC_SYSRQ
611 {
612 .ctl_name = KERN_SYSRQ,
613 .procname = "sysrq",
614 .data = &__sysrq_enabled,
615 .maxlen = sizeof (int),
616 .mode = 0644,
617 .proc_handler = &proc_dointvec,
618 },
619 #endif
620 #ifdef CONFIG_PROC_SYSCTL
621 {
622 .procname = "cad_pid",
623 .data = NULL,
624 .maxlen = sizeof (int),
625 .mode = 0600,
626 .proc_handler = &proc_do_cad_pid,
627 },
628 #endif
629 {
630 .ctl_name = KERN_MAX_THREADS,
631 .procname = "threads-max",
632 .data = &max_threads,
633 .maxlen = sizeof(int),
634 .mode = 0644,
635 .proc_handler = &proc_dointvec,
636 },
637 {
638 .ctl_name = KERN_RANDOM,
639 .procname = "random",
640 .mode = 0555,
641 .child = random_table,
642 },
643 {
644 .ctl_name = KERN_OVERFLOWUID,
645 .procname = "overflowuid",
646 .data = &overflowuid,
647 .maxlen = sizeof(int),
648 .mode = 0644,
649 .proc_handler = &proc_dointvec_minmax,
650 .strategy = &sysctl_intvec,
651 .extra1 = &minolduid,
652 .extra2 = &maxolduid,
653 },
654 {
655 .ctl_name = KERN_OVERFLOWGID,
656 .procname = "overflowgid",
657 .data = &overflowgid,
658 .maxlen = sizeof(int),
659 .mode = 0644,
660 .proc_handler = &proc_dointvec_minmax,
661 .strategy = &sysctl_intvec,
662 .extra1 = &minolduid,
663 .extra2 = &maxolduid,
664 },
665 #ifdef CONFIG_S390
666 #ifdef CONFIG_MATHEMU
667 {
668 .ctl_name = KERN_IEEE_EMULATION_WARNINGS,
669 .procname = "ieee_emulation_warnings",
670 .data = &sysctl_ieee_emulation_warnings,
671 .maxlen = sizeof(int),
672 .mode = 0644,
673 .proc_handler = &proc_dointvec,
674 },
675 #endif
676 #ifdef CONFIG_NO_IDLE_HZ
677 {
678 .ctl_name = KERN_HZ_TIMER,
679 .procname = "hz_timer",
680 .data = &sysctl_hz_timer,
681 .maxlen = sizeof(int),
682 .mode = 0644,
683 .proc_handler = &proc_dointvec,
684 },
685 #endif
686 {
687 .ctl_name = KERN_S390_USER_DEBUG_LOGGING,
688 .procname = "userprocess_debug",
689 .data = &sysctl_userprocess_debug,
690 .maxlen = sizeof(int),
691 .mode = 0644,
692 .proc_handler = &proc_dointvec,
693 },
694 #endif
695 {
696 .ctl_name = KERN_PIDMAX,
697 .procname = "pid_max",
698 .data = &pid_max,
699 .maxlen = sizeof (int),
700 .mode = 0644,
701 .proc_handler = &proc_dointvec_minmax,
702 .strategy = sysctl_intvec,
703 .extra1 = &pid_max_min,
704 .extra2 = &pid_max_max,
705 },
706 {
707 .ctl_name = KERN_PANIC_ON_OOPS,
708 .procname = "panic_on_oops",
709 .data = &panic_on_oops,
710 .maxlen = sizeof(int),
711 .mode = 0644,
712 .proc_handler = &proc_dointvec,
713 },
714 #if defined CONFIG_PRINTK
715 {
716 .ctl_name = KERN_PRINTK,
717 .procname = "printk",
718 .data = &console_loglevel,
719 .maxlen = 4*sizeof(int),
720 .mode = 0644,
721 .proc_handler = &proc_dointvec,
722 },
723 {
724 .ctl_name = KERN_PRINTK_RATELIMIT,
725 .procname = "printk_ratelimit",
726 .data = &printk_ratelimit_jiffies,
727 .maxlen = sizeof(int),
728 .mode = 0644,
729 .proc_handler = &proc_dointvec_jiffies,
730 .strategy = &sysctl_jiffies,
731 },
732 {
733 .ctl_name = KERN_PRINTK_RATELIMIT_BURST,
734 .procname = "printk_ratelimit_burst",
735 .data = &printk_ratelimit_burst,
736 .maxlen = sizeof(int),
737 .mode = 0644,
738 .proc_handler = &proc_dointvec,
739 },
740 #endif
741 {
742 .ctl_name = KERN_NGROUPS_MAX,
743 .procname = "ngroups_max",
744 .data = &ngroups_max,
745 .maxlen = sizeof (int),
746 .mode = 0444,
747 .proc_handler = &proc_dointvec,
748 },
749 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
750 {
751 .ctl_name = KERN_UNKNOWN_NMI_PANIC,
752 .procname = "unknown_nmi_panic",
753 .data = &unknown_nmi_panic,
754 .maxlen = sizeof (int),
755 .mode = 0644,
756 .proc_handler = &proc_dointvec,
757 },
758 {
759 .procname = "nmi_watchdog",
760 .data = &nmi_watchdog_enabled,
761 .maxlen = sizeof (int),
762 .mode = 0644,
763 .proc_handler = &proc_nmi_enabled,
764 },
765 #endif
766 #if defined(CONFIG_X86)
767 {
768 .ctl_name = KERN_PANIC_ON_NMI,
769 .procname = "panic_on_unrecovered_nmi",
770 .data = &panic_on_unrecovered_nmi,
771 .maxlen = sizeof(int),
772 .mode = 0644,
773 .proc_handler = &proc_dointvec,
774 },
775 {
776 .ctl_name = KERN_BOOTLOADER_TYPE,
777 .procname = "bootloader_type",
778 .data = &bootloader_type,
779 .maxlen = sizeof (int),
780 .mode = 0444,
781 .proc_handler = &proc_dointvec,
782 },
783 {
784 .ctl_name = CTL_UNNUMBERED,
785 .procname = "kstack_depth_to_print",
786 .data = &kstack_depth_to_print,
787 .maxlen = sizeof(int),
788 .mode = 0644,
789 .proc_handler = &proc_dointvec,
790 },
791 {
792 .ctl_name = CTL_UNNUMBERED,
793 .procname = "io_delay_type",
794 .data = &io_delay_type,
795 .maxlen = sizeof(int),
796 .mode = 0644,
797 .proc_handler = &proc_dointvec,
798 },
799 #endif
800 #if defined(CONFIG_MMU)
801 {
802 .ctl_name = KERN_RANDOMIZE,
803 .procname = "randomize_va_space",
804 .data = &randomize_va_space,
805 .maxlen = sizeof(int),
806 .mode = 0644,
807 .proc_handler = &proc_dointvec,
808 },
809 #endif
810 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
811 {
812 .ctl_name = KERN_SPIN_RETRY,
813 .procname = "spin_retry",
814 .data = &spin_retry,
815 .maxlen = sizeof (int),
816 .mode = 0644,
817 .proc_handler = &proc_dointvec,
818 },
819 #endif
820 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
821 {
822 .procname = "acpi_video_flags",
823 .data = &acpi_realmode_flags,
824 .maxlen = sizeof (unsigned long),
825 .mode = 0644,
826 .proc_handler = &proc_doulongvec_minmax,
827 },
828 #endif
829 #ifdef CONFIG_IA64
830 {
831 .ctl_name = KERN_IA64_UNALIGNED,
832 .procname = "ignore-unaligned-usertrap",
833 .data = &no_unaligned_warning,
834 .maxlen = sizeof (int),
835 .mode = 0644,
836 .proc_handler = &proc_dointvec,
837 },
838 #endif
839 #ifdef CONFIG_DETECT_SOFTLOCKUP
840 {
841 .ctl_name = CTL_UNNUMBERED,
842 .procname = "softlockup_thresh",
843 .data = &softlockup_thresh,
844 .maxlen = sizeof(unsigned long),
845 .mode = 0644,
846 .proc_handler = &proc_doulongvec_minmax,
847 .strategy = &sysctl_intvec,
848 .extra1 = &one,
849 .extra2 = &sixty,
850 },
851 {
852 .ctl_name = CTL_UNNUMBERED,
853 .procname = "hung_task_check_count",
854 .data = &sysctl_hung_task_check_count,
855 .maxlen = sizeof(unsigned long),
856 .mode = 0644,
857 .proc_handler = &proc_doulongvec_minmax,
858 .strategy = &sysctl_intvec,
859 },
860 {
861 .ctl_name = CTL_UNNUMBERED,
862 .procname = "hung_task_timeout_secs",
863 .data = &sysctl_hung_task_timeout_secs,
864 .maxlen = sizeof(unsigned long),
865 .mode = 0644,
866 .proc_handler = &proc_doulongvec_minmax,
867 .strategy = &sysctl_intvec,
868 },
869 {
870 .ctl_name = CTL_UNNUMBERED,
871 .procname = "hung_task_warnings",
872 .data = &sysctl_hung_task_warnings,
873 .maxlen = sizeof(unsigned long),
874 .mode = 0644,
875 .proc_handler = &proc_doulongvec_minmax,
876 .strategy = &sysctl_intvec,
877 },
878 #endif
879 #ifdef CONFIG_COMPAT
880 {
881 .ctl_name = KERN_COMPAT_LOG,
882 .procname = "compat-log",
883 .data = &compat_log,
884 .maxlen = sizeof (int),
885 .mode = 0644,
886 .proc_handler = &proc_dointvec,
887 },
888 #endif
889 #ifdef CONFIG_RT_MUTEXES
890 {
891 .ctl_name = KERN_MAX_LOCK_DEPTH,
892 .procname = "max_lock_depth",
893 .data = &max_lock_depth,
894 .maxlen = sizeof(int),
895 .mode = 0644,
896 .proc_handler = &proc_dointvec,
897 },
898 #endif
899 #ifdef CONFIG_PROC_FS
900 {
901 .ctl_name = CTL_UNNUMBERED,
902 .procname = "maps_protect",
903 .data = &maps_protect,
904 .maxlen = sizeof(int),
905 .mode = 0644,
906 .proc_handler = &proc_dointvec,
907 },
908 #endif
909 {
910 .ctl_name = CTL_UNNUMBERED,
911 .procname = "poweroff_cmd",
912 .data = &poweroff_cmd,
913 .maxlen = POWEROFF_CMD_PATH_LEN,
914 .mode = 0644,
915 .proc_handler = &proc_dostring,
916 .strategy = &sysctl_string,
917 },
918 /*
919 * NOTE: do not add new entries to this table unless you have read
920 * Documentation/sysctl/ctl_unnumbered.txt
921 */
922 { .ctl_name = 0 }
923 };
924
925 static struct ctl_table vm_table[] = {
926 {
927 .ctl_name = VM_OVERCOMMIT_MEMORY,
928 .procname = "overcommit_memory",
929 .data = &sysctl_overcommit_memory,
930 .maxlen = sizeof(sysctl_overcommit_memory),
931 .mode = 0644,
932 .proc_handler = &proc_dointvec,
933 },
934 {
935 .ctl_name = VM_PANIC_ON_OOM,
936 .procname = "panic_on_oom",
937 .data = &sysctl_panic_on_oom,
938 .maxlen = sizeof(sysctl_panic_on_oom),
939 .mode = 0644,
940 .proc_handler = &proc_dointvec,
941 },
942 {
943 .ctl_name = CTL_UNNUMBERED,
944 .procname = "oom_kill_allocating_task",
945 .data = &sysctl_oom_kill_allocating_task,
946 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
947 .mode = 0644,
948 .proc_handler = &proc_dointvec,
949 },
950 {
951 .ctl_name = CTL_UNNUMBERED,
952 .procname = "oom_dump_tasks",
953 .data = &sysctl_oom_dump_tasks,
954 .maxlen = sizeof(sysctl_oom_dump_tasks),
955 .mode = 0644,
956 .proc_handler = &proc_dointvec,
957 },
958 {
959 .ctl_name = VM_OVERCOMMIT_RATIO,
960 .procname = "overcommit_ratio",
961 .data = &sysctl_overcommit_ratio,
962 .maxlen = sizeof(sysctl_overcommit_ratio),
963 .mode = 0644,
964 .proc_handler = &proc_dointvec,
965 },
966 {
967 .ctl_name = VM_PAGE_CLUSTER,
968 .procname = "page-cluster",
969 .data = &page_cluster,
970 .maxlen = sizeof(int),
971 .mode = 0644,
972 .proc_handler = &proc_dointvec,
973 },
974 {
975 .ctl_name = VM_DIRTY_BACKGROUND,
976 .procname = "dirty_background_ratio",
977 .data = &dirty_background_ratio,
978 .maxlen = sizeof(dirty_background_ratio),
979 .mode = 0644,
980 .proc_handler = &proc_dointvec_minmax,
981 .strategy = &sysctl_intvec,
982 .extra1 = &zero,
983 .extra2 = &one_hundred,
984 },
985 {
986 .ctl_name = VM_DIRTY_RATIO,
987 .procname = "dirty_ratio",
988 .data = &vm_dirty_ratio,
989 .maxlen = sizeof(vm_dirty_ratio),
990 .mode = 0644,
991 .proc_handler = &dirty_ratio_handler,
992 .strategy = &sysctl_intvec,
993 .extra1 = &zero,
994 .extra2 = &one_hundred,
995 },
996 {
997 .procname = "dirty_writeback_centisecs",
998 .data = &dirty_writeback_interval,
999 .maxlen = sizeof(dirty_writeback_interval),
1000 .mode = 0644,
1001 .proc_handler = &dirty_writeback_centisecs_handler,
1002 },
1003 {
1004 .procname = "dirty_expire_centisecs",
1005 .data = &dirty_expire_interval,
1006 .maxlen = sizeof(dirty_expire_interval),
1007 .mode = 0644,
1008 .proc_handler = &proc_dointvec_userhz_jiffies,
1009 },
1010 {
1011 .ctl_name = VM_NR_PDFLUSH_THREADS,
1012 .procname = "nr_pdflush_threads",
1013 .data = &nr_pdflush_threads,
1014 .maxlen = sizeof nr_pdflush_threads,
1015 .mode = 0444 /* read-only*/,
1016 .proc_handler = &proc_dointvec,
1017 },
1018 {
1019 .ctl_name = VM_SWAPPINESS,
1020 .procname = "swappiness",
1021 .data = &vm_swappiness,
1022 .maxlen = sizeof(vm_swappiness),
1023 .mode = 0644,
1024 .proc_handler = &proc_dointvec_minmax,
1025 .strategy = &sysctl_intvec,
1026 .extra1 = &zero,
1027 .extra2 = &one_hundred,
1028 },
1029 #ifdef CONFIG_HUGETLB_PAGE
1030 {
1031 .procname = "nr_hugepages",
1032 .data = &max_huge_pages,
1033 .maxlen = sizeof(unsigned long),
1034 .mode = 0644,
1035 .proc_handler = &hugetlb_sysctl_handler,
1036 .extra1 = (void *)&hugetlb_zero,
1037 .extra2 = (void *)&hugetlb_infinity,
1038 },
1039 {
1040 .ctl_name = VM_HUGETLB_GROUP,
1041 .procname = "hugetlb_shm_group",
1042 .data = &sysctl_hugetlb_shm_group,
1043 .maxlen = sizeof(gid_t),
1044 .mode = 0644,
1045 .proc_handler = &proc_dointvec,
1046 },
1047 {
1048 .ctl_name = CTL_UNNUMBERED,
1049 .procname = "hugepages_treat_as_movable",
1050 .data = &hugepages_treat_as_movable,
1051 .maxlen = sizeof(int),
1052 .mode = 0644,
1053 .proc_handler = &hugetlb_treat_movable_handler,
1054 },
1055 {
1056 .ctl_name = CTL_UNNUMBERED,
1057 .procname = "nr_overcommit_hugepages",
1058 .data = &sysctl_overcommit_huge_pages,
1059 .maxlen = sizeof(sysctl_overcommit_huge_pages),
1060 .mode = 0644,
1061 .proc_handler = &hugetlb_overcommit_handler,
1062 },
1063 #endif
1064 {
1065 .ctl_name = VM_LOWMEM_RESERVE_RATIO,
1066 .procname = "lowmem_reserve_ratio",
1067 .data = &sysctl_lowmem_reserve_ratio,
1068 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1069 .mode = 0644,
1070 .proc_handler = &lowmem_reserve_ratio_sysctl_handler,
1071 .strategy = &sysctl_intvec,
1072 },
1073 {
1074 .ctl_name = VM_DROP_PAGECACHE,
1075 .procname = "drop_caches",
1076 .data = &sysctl_drop_caches,
1077 .maxlen = sizeof(int),
1078 .mode = 0644,
1079 .proc_handler = drop_caches_sysctl_handler,
1080 .strategy = &sysctl_intvec,
1081 },
1082 {
1083 .ctl_name = VM_MIN_FREE_KBYTES,
1084 .procname = "min_free_kbytes",
1085 .data = &min_free_kbytes,
1086 .maxlen = sizeof(min_free_kbytes),
1087 .mode = 0644,
1088 .proc_handler = &min_free_kbytes_sysctl_handler,
1089 .strategy = &sysctl_intvec,
1090 .extra1 = &zero,
1091 },
1092 {
1093 .ctl_name = VM_PERCPU_PAGELIST_FRACTION,
1094 .procname = "percpu_pagelist_fraction",
1095 .data = &percpu_pagelist_fraction,
1096 .maxlen = sizeof(percpu_pagelist_fraction),
1097 .mode = 0644,
1098 .proc_handler = &percpu_pagelist_fraction_sysctl_handler,
1099 .strategy = &sysctl_intvec,
1100 .extra1 = &min_percpu_pagelist_fract,
1101 },
1102 #ifdef CONFIG_MMU
1103 {
1104 .ctl_name = VM_MAX_MAP_COUNT,
1105 .procname = "max_map_count",
1106 .data = &sysctl_max_map_count,
1107 .maxlen = sizeof(sysctl_max_map_count),
1108 .mode = 0644,
1109 .proc_handler = &proc_dointvec
1110 },
1111 #endif
1112 {
1113 .ctl_name = VM_LAPTOP_MODE,
1114 .procname = "laptop_mode",
1115 .data = &laptop_mode,
1116 .maxlen = sizeof(laptop_mode),
1117 .mode = 0644,
1118 .proc_handler = &proc_dointvec_jiffies,
1119 .strategy = &sysctl_jiffies,
1120 },
1121 {
1122 .ctl_name = VM_BLOCK_DUMP,
1123 .procname = "block_dump",
1124 .data = &block_dump,
1125 .maxlen = sizeof(block_dump),
1126 .mode = 0644,
1127 .proc_handler = &proc_dointvec,
1128 .strategy = &sysctl_intvec,
1129 .extra1 = &zero,
1130 },
1131 {
1132 .ctl_name = VM_VFS_CACHE_PRESSURE,
1133 .procname = "vfs_cache_pressure",
1134 .data = &sysctl_vfs_cache_pressure,
1135 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1136 .mode = 0644,
1137 .proc_handler = &proc_dointvec,
1138 .strategy = &sysctl_intvec,
1139 .extra1 = &zero,
1140 },
1141 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1142 {
1143 .ctl_name = VM_LEGACY_VA_LAYOUT,
1144 .procname = "legacy_va_layout",
1145 .data = &sysctl_legacy_va_layout,
1146 .maxlen = sizeof(sysctl_legacy_va_layout),
1147 .mode = 0644,
1148 .proc_handler = &proc_dointvec,
1149 .strategy = &sysctl_intvec,
1150 .extra1 = &zero,
1151 },
1152 #endif
1153 #ifdef CONFIG_NUMA
1154 {
1155 .ctl_name = VM_ZONE_RECLAIM_MODE,
1156 .procname = "zone_reclaim_mode",
1157 .data = &zone_reclaim_mode,
1158 .maxlen = sizeof(zone_reclaim_mode),
1159 .mode = 0644,
1160 .proc_handler = &proc_dointvec,
1161 .strategy = &sysctl_intvec,
1162 .extra1 = &zero,
1163 },
1164 {
1165 .ctl_name = VM_MIN_UNMAPPED,
1166 .procname = "min_unmapped_ratio",
1167 .data = &sysctl_min_unmapped_ratio,
1168 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1169 .mode = 0644,
1170 .proc_handler = &sysctl_min_unmapped_ratio_sysctl_handler,
1171 .strategy = &sysctl_intvec,
1172 .extra1 = &zero,
1173 .extra2 = &one_hundred,
1174 },
1175 {
1176 .ctl_name = VM_MIN_SLAB,
1177 .procname = "min_slab_ratio",
1178 .data = &sysctl_min_slab_ratio,
1179 .maxlen = sizeof(sysctl_min_slab_ratio),
1180 .mode = 0644,
1181 .proc_handler = &sysctl_min_slab_ratio_sysctl_handler,
1182 .strategy = &sysctl_intvec,
1183 .extra1 = &zero,
1184 .extra2 = &one_hundred,
1185 },
1186 #endif
1187 #ifdef CONFIG_SMP
1188 {
1189 .ctl_name = CTL_UNNUMBERED,
1190 .procname = "stat_interval",
1191 .data = &sysctl_stat_interval,
1192 .maxlen = sizeof(sysctl_stat_interval),
1193 .mode = 0644,
1194 .proc_handler = &proc_dointvec_jiffies,
1195 .strategy = &sysctl_jiffies,
1196 },
1197 #endif
1198 #ifdef CONFIG_SECURITY
1199 {
1200 .ctl_name = CTL_UNNUMBERED,
1201 .procname = "mmap_min_addr",
1202 .data = &mmap_min_addr,
1203 .maxlen = sizeof(unsigned long),
1204 .mode = 0644,
1205 .proc_handler = &proc_doulongvec_minmax,
1206 },
1207 #endif
1208 #ifdef CONFIG_NUMA
1209 {
1210 .ctl_name = CTL_UNNUMBERED,
1211 .procname = "numa_zonelist_order",
1212 .data = &numa_zonelist_order,
1213 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1214 .mode = 0644,
1215 .proc_handler = &numa_zonelist_order_handler,
1216 .strategy = &sysctl_string,
1217 },
1218 #endif
1219 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1220 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1221 {
1222 .ctl_name = VM_VDSO_ENABLED,
1223 .procname = "vdso_enabled",
1224 .data = &vdso_enabled,
1225 .maxlen = sizeof(vdso_enabled),
1226 .mode = 0644,
1227 .proc_handler = &proc_dointvec,
1228 .strategy = &sysctl_intvec,
1229 .extra1 = &zero,
1230 },
1231 #endif
1232 #ifdef CONFIG_HIGHMEM
1233 {
1234 .ctl_name = CTL_UNNUMBERED,
1235 .procname = "highmem_is_dirtyable",
1236 .data = &vm_highmem_is_dirtyable,
1237 .maxlen = sizeof(vm_highmem_is_dirtyable),
1238 .mode = 0644,
1239 .proc_handler = &proc_dointvec_minmax,
1240 .strategy = &sysctl_intvec,
1241 .extra1 = &zero,
1242 .extra2 = &one,
1243 },
1244 #endif
1245 /*
1246 * NOTE: do not add new entries to this table unless you have read
1247 * Documentation/sysctl/ctl_unnumbered.txt
1248 */
1249 { .ctl_name = 0 }
1250 };
1251
1252 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1253 static struct ctl_table binfmt_misc_table[] = {
1254 { .ctl_name = 0 }
1255 };
1256 #endif
1257
1258 static struct ctl_table fs_table[] = {
1259 {
1260 .ctl_name = FS_NRINODE,
1261 .procname = "inode-nr",
1262 .data = &inodes_stat,
1263 .maxlen = 2*sizeof(int),
1264 .mode = 0444,
1265 .proc_handler = &proc_dointvec,
1266 },
1267 {
1268 .ctl_name = FS_STATINODE,
1269 .procname = "inode-state",
1270 .data = &inodes_stat,
1271 .maxlen = 7*sizeof(int),
1272 .mode = 0444,
1273 .proc_handler = &proc_dointvec,
1274 },
1275 {
1276 .procname = "file-nr",
1277 .data = &files_stat,
1278 .maxlen = 3*sizeof(int),
1279 .mode = 0444,
1280 .proc_handler = &proc_nr_files,
1281 },
1282 {
1283 .ctl_name = FS_MAXFILE,
1284 .procname = "file-max",
1285 .data = &files_stat.max_files,
1286 .maxlen = sizeof(int),
1287 .mode = 0644,
1288 .proc_handler = &proc_dointvec,
1289 },
1290 {
1291 .ctl_name = CTL_UNNUMBERED,
1292 .procname = "nr_open",
1293 .data = &sysctl_nr_open,
1294 .maxlen = sizeof(int),
1295 .mode = 0644,
1296 .proc_handler = &proc_dointvec,
1297 },
1298 {
1299 .ctl_name = FS_DENTRY,
1300 .procname = "dentry-state",
1301 .data = &dentry_stat,
1302 .maxlen = 6*sizeof(int),
1303 .mode = 0444,
1304 .proc_handler = &proc_dointvec,
1305 },
1306 {
1307 .ctl_name = FS_OVERFLOWUID,
1308 .procname = "overflowuid",
1309 .data = &fs_overflowuid,
1310 .maxlen = sizeof(int),
1311 .mode = 0644,
1312 .proc_handler = &proc_dointvec_minmax,
1313 .strategy = &sysctl_intvec,
1314 .extra1 = &minolduid,
1315 .extra2 = &maxolduid,
1316 },
1317 {
1318 .ctl_name = FS_OVERFLOWGID,
1319 .procname = "overflowgid",
1320 .data = &fs_overflowgid,
1321 .maxlen = sizeof(int),
1322 .mode = 0644,
1323 .proc_handler = &proc_dointvec_minmax,
1324 .strategy = &sysctl_intvec,
1325 .extra1 = &minolduid,
1326 .extra2 = &maxolduid,
1327 },
1328 {
1329 .ctl_name = FS_LEASES,
1330 .procname = "leases-enable",
1331 .data = &leases_enable,
1332 .maxlen = sizeof(int),
1333 .mode = 0644,
1334 .proc_handler = &proc_dointvec,
1335 },
1336 #ifdef CONFIG_DNOTIFY
1337 {
1338 .ctl_name = FS_DIR_NOTIFY,
1339 .procname = "dir-notify-enable",
1340 .data = &dir_notify_enable,
1341 .maxlen = sizeof(int),
1342 .mode = 0644,
1343 .proc_handler = &proc_dointvec,
1344 },
1345 #endif
1346 #ifdef CONFIG_MMU
1347 {
1348 .ctl_name = FS_LEASE_TIME,
1349 .procname = "lease-break-time",
1350 .data = &lease_break_time,
1351 .maxlen = sizeof(int),
1352 .mode = 0644,
1353 .proc_handler = &proc_dointvec_minmax,
1354 .strategy = &sysctl_intvec,
1355 .extra1 = &zero,
1356 .extra2 = &two,
1357 },
1358 {
1359 .procname = "aio-nr",
1360 .data = &aio_nr,
1361 .maxlen = sizeof(aio_nr),
1362 .mode = 0444,
1363 .proc_handler = &proc_doulongvec_minmax,
1364 },
1365 {
1366 .procname = "aio-max-nr",
1367 .data = &aio_max_nr,
1368 .maxlen = sizeof(aio_max_nr),
1369 .mode = 0644,
1370 .proc_handler = &proc_doulongvec_minmax,
1371 },
1372 #ifdef CONFIG_INOTIFY_USER
1373 {
1374 .ctl_name = FS_INOTIFY,
1375 .procname = "inotify",
1376 .mode = 0555,
1377 .child = inotify_table,
1378 },
1379 #endif
1380 #endif
1381 {
1382 .ctl_name = KERN_SETUID_DUMPABLE,
1383 .procname = "suid_dumpable",
1384 .data = &suid_dumpable,
1385 .maxlen = sizeof(int),
1386 .mode = 0644,
1387 .proc_handler = &proc_dointvec,
1388 },
1389 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1390 {
1391 .ctl_name = CTL_UNNUMBERED,
1392 .procname = "binfmt_misc",
1393 .mode = 0555,
1394 .child = binfmt_misc_table,
1395 },
1396 #endif
1397 /*
1398 * NOTE: do not add new entries to this table unless you have read
1399 * Documentation/sysctl/ctl_unnumbered.txt
1400 */
1401 { .ctl_name = 0 }
1402 };
1403
1404 static struct ctl_table debug_table[] = {
1405 #if defined(CONFIG_X86) || defined(CONFIG_PPC)
1406 {
1407 .ctl_name = CTL_UNNUMBERED,
1408 .procname = "exception-trace",
1409 .data = &show_unhandled_signals,
1410 .maxlen = sizeof(int),
1411 .mode = 0644,
1412 .proc_handler = proc_dointvec
1413 },
1414 #endif
1415 { .ctl_name = 0 }
1416 };
1417
1418 static struct ctl_table dev_table[] = {
1419 { .ctl_name = 0 }
1420 };
1421
1422 static DEFINE_SPINLOCK(sysctl_lock);
1423
1424 /* called under sysctl_lock */
1425 static int use_table(struct ctl_table_header *p)
1426 {
1427 if (unlikely(p->unregistering))
1428 return 0;
1429 p->used++;
1430 return 1;
1431 }
1432
1433 /* called under sysctl_lock */
1434 static void unuse_table(struct ctl_table_header *p)
1435 {
1436 if (!--p->used)
1437 if (unlikely(p->unregistering))
1438 complete(p->unregistering);
1439 }
1440
1441 /* called under sysctl_lock, will reacquire if has to wait */
1442 static void start_unregistering(struct ctl_table_header *p)
1443 {
1444 /*
1445 * if p->used is 0, nobody will ever touch that entry again;
1446 * we'll eliminate all paths to it before dropping sysctl_lock
1447 */
1448 if (unlikely(p->used)) {
1449 struct completion wait;
1450 init_completion(&wait);
1451 p->unregistering = &wait;
1452 spin_unlock(&sysctl_lock);
1453 wait_for_completion(&wait);
1454 spin_lock(&sysctl_lock);
1455 }
1456 /*
1457 * do not remove from the list until nobody holds it; walking the
1458 * list in do_sysctl() relies on that.
1459 */
1460 list_del_init(&p->ctl_entry);
1461 }
1462
1463 void sysctl_head_finish(struct ctl_table_header *head)
1464 {
1465 if (!head)
1466 return;
1467 spin_lock(&sysctl_lock);
1468 unuse_table(head);
1469 spin_unlock(&sysctl_lock);
1470 }
1471
1472 static struct list_head *
1473 lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces)
1474 {
1475 struct list_head *header_list;
1476 header_list = &root->header_list;
1477 if (root->lookup)
1478 header_list = root->lookup(root, namespaces);
1479 return header_list;
1480 }
1481
1482 struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces,
1483 struct ctl_table_header *prev)
1484 {
1485 struct ctl_table_root *root;
1486 struct list_head *header_list;
1487 struct ctl_table_header *head;
1488 struct list_head *tmp;
1489
1490 spin_lock(&sysctl_lock);
1491 if (prev) {
1492 head = prev;
1493 tmp = &prev->ctl_entry;
1494 unuse_table(prev);
1495 goto next;
1496 }
1497 tmp = &root_table_header.ctl_entry;
1498 for (;;) {
1499 head = list_entry(tmp, struct ctl_table_header, ctl_entry);
1500
1501 if (!use_table(head))
1502 goto next;
1503 spin_unlock(&sysctl_lock);
1504 return head;
1505 next:
1506 root = head->root;
1507 tmp = tmp->next;
1508 header_list = lookup_header_list(root, namespaces);
1509 if (tmp != header_list)
1510 continue;
1511
1512 do {
1513 root = list_entry(root->root_list.next,
1514 struct ctl_table_root, root_list);
1515 if (root == &sysctl_table_root)
1516 goto out;
1517 header_list = lookup_header_list(root, namespaces);
1518 } while (list_empty(header_list));
1519 tmp = header_list->next;
1520 }
1521 out:
1522 spin_unlock(&sysctl_lock);
1523 return NULL;
1524 }
1525
1526 struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev)
1527 {
1528 return __sysctl_head_next(current->nsproxy, prev);
1529 }
1530
1531 void register_sysctl_root(struct ctl_table_root *root)
1532 {
1533 spin_lock(&sysctl_lock);
1534 list_add_tail(&root->root_list, &sysctl_table_root.root_list);
1535 spin_unlock(&sysctl_lock);
1536 }
1537
1538 #ifdef CONFIG_SYSCTL_SYSCALL
1539 int do_sysctl(int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp,
1540 void __user *newval, size_t newlen)
1541 {
1542 struct ctl_table_header *head;
1543 int error = -ENOTDIR;
1544
1545 if (nlen <= 0 || nlen >= CTL_MAXNAME)
1546 return -ENOTDIR;
1547 if (oldval) {
1548 int old_len;
1549 if (!oldlenp || get_user(old_len, oldlenp))
1550 return -EFAULT;
1551 }
1552
1553 for (head = sysctl_head_next(NULL); head;
1554 head = sysctl_head_next(head)) {
1555 error = parse_table(name, nlen, oldval, oldlenp,
1556 newval, newlen, head->ctl_table);
1557 if (error != -ENOTDIR) {
1558 sysctl_head_finish(head);
1559 break;
1560 }
1561 }
1562 return error;
1563 }
1564
1565 asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
1566 {
1567 struct __sysctl_args tmp;
1568 int error;
1569
1570 if (copy_from_user(&tmp, args, sizeof(tmp)))
1571 return -EFAULT;
1572
1573 error = deprecated_sysctl_warning(&tmp);
1574 if (error)
1575 goto out;
1576
1577 lock_kernel();
1578 error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp,
1579 tmp.newval, tmp.newlen);
1580 unlock_kernel();
1581 out:
1582 return error;
1583 }
1584 #endif /* CONFIG_SYSCTL_SYSCALL */
1585
1586 /*
1587 * sysctl_perm does NOT grant the superuser all rights automatically, because
1588 * some sysctl variables are readonly even to root.
1589 */
1590
1591 static int test_perm(int mode, int op)
1592 {
1593 if (!current->euid)
1594 mode >>= 6;
1595 else if (in_egroup_p(0))
1596 mode >>= 3;
1597 if ((mode & op & 0007) == op)
1598 return 0;
1599 return -EACCES;
1600 }
1601
1602 int sysctl_perm(struct ctl_table *table, int op)
1603 {
1604 int error;
1605 error = security_sysctl(table, op);
1606 if (error)
1607 return error;
1608 return test_perm(table->mode, op);
1609 }
1610
1611 #ifdef CONFIG_SYSCTL_SYSCALL
1612 static int parse_table(int __user *name, int nlen,
1613 void __user *oldval, size_t __user *oldlenp,
1614 void __user *newval, size_t newlen,
1615 struct ctl_table *table)
1616 {
1617 int n;
1618 repeat:
1619 if (!nlen)
1620 return -ENOTDIR;
1621 if (get_user(n, name))
1622 return -EFAULT;
1623 for ( ; table->ctl_name || table->procname; table++) {
1624 if (!table->ctl_name)
1625 continue;
1626 if (n == table->ctl_name) {
1627 int error;
1628 if (table->child) {
1629 if (sysctl_perm(table, 001))
1630 return -EPERM;
1631 name++;
1632 nlen--;
1633 table = table->child;
1634 goto repeat;
1635 }
1636 error = do_sysctl_strategy(table, name, nlen,
1637 oldval, oldlenp,
1638 newval, newlen);
1639 return error;
1640 }
1641 }
1642 return -ENOTDIR;
1643 }
1644
1645 /* Perform the actual read/write of a sysctl table entry. */
1646 int do_sysctl_strategy (struct ctl_table *table,
1647 int __user *name, int nlen,
1648 void __user *oldval, size_t __user *oldlenp,
1649 void __user *newval, size_t newlen)
1650 {
1651 int op = 0, rc;
1652
1653 if (oldval)
1654 op |= 004;
1655 if (newval)
1656 op |= 002;
1657 if (sysctl_perm(table, op))
1658 return -EPERM;
1659
1660 if (table->strategy) {
1661 rc = table->strategy(table, name, nlen, oldval, oldlenp,
1662 newval, newlen);
1663 if (rc < 0)
1664 return rc;
1665 if (rc > 0)
1666 return 0;
1667 }
1668
1669 /* If there is no strategy routine, or if the strategy returns
1670 * zero, proceed with automatic r/w */
1671 if (table->data && table->maxlen) {
1672 rc = sysctl_data(table, name, nlen, oldval, oldlenp,
1673 newval, newlen);
1674 if (rc < 0)
1675 return rc;
1676 }
1677 return 0;
1678 }
1679 #endif /* CONFIG_SYSCTL_SYSCALL */
1680
1681 static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table)
1682 {
1683 for (; table->ctl_name || table->procname; table++) {
1684 table->parent = parent;
1685 if (table->child)
1686 sysctl_set_parent(table, table->child);
1687 }
1688 }
1689
1690 static __init int sysctl_init(void)
1691 {
1692 int err;
1693 sysctl_set_parent(NULL, root_table);
1694 err = sysctl_check_table(current->nsproxy, root_table);
1695 return 0;
1696 }
1697
1698 core_initcall(sysctl_init);
1699
1700 /**
1701 * __register_sysctl_paths - register a sysctl hierarchy
1702 * @root: List of sysctl headers to register on
1703 * @namespaces: Data to compute which lists of sysctl entries are visible
1704 * @path: The path to the directory the sysctl table is in.
1705 * @table: the top-level table structure
1706 *
1707 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1708 * array. A completely 0 filled entry terminates the table.
1709 *
1710 * The members of the &struct ctl_table structure are used as follows:
1711 *
1712 * ctl_name - This is the numeric sysctl value used by sysctl(2). The number
1713 * must be unique within that level of sysctl
1714 *
1715 * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1716 * enter a sysctl file
1717 *
1718 * data - a pointer to data for use by proc_handler
1719 *
1720 * maxlen - the maximum size in bytes of the data
1721 *
1722 * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1723 *
1724 * child - a pointer to the child sysctl table if this entry is a directory, or
1725 * %NULL.
1726 *
1727 * proc_handler - the text handler routine (described below)
1728 *
1729 * strategy - the strategy routine (described below)
1730 *
1731 * de - for internal use by the sysctl routines
1732 *
1733 * extra1, extra2 - extra pointers usable by the proc handler routines
1734 *
1735 * Leaf nodes in the sysctl tree will be represented by a single file
1736 * under /proc; non-leaf nodes will be represented by directories.
1737 *
1738 * sysctl(2) can automatically manage read and write requests through
1739 * the sysctl table. The data and maxlen fields of the ctl_table
1740 * struct enable minimal validation of the values being written to be
1741 * performed, and the mode field allows minimal authentication.
1742 *
1743 * More sophisticated management can be enabled by the provision of a
1744 * strategy routine with the table entry. This will be called before
1745 * any automatic read or write of the data is performed.
1746 *
1747 * The strategy routine may return
1748 *
1749 * < 0 - Error occurred (error is passed to user process)
1750 *
1751 * 0 - OK - proceed with automatic read or write.
1752 *
1753 * > 0 - OK - read or write has been done by the strategy routine, so
1754 * return immediately.
1755 *
1756 * There must be a proc_handler routine for any terminal nodes
1757 * mirrored under /proc/sys (non-terminals are handled by a built-in
1758 * directory handler). Several default handlers are available to
1759 * cover common cases -
1760 *
1761 * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
1762 * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(),
1763 * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
1764 *
1765 * It is the handler's job to read the input buffer from user memory
1766 * and process it. The handler should return 0 on success.
1767 *
1768 * This routine returns %NULL on a failure to register, and a pointer
1769 * to the table header on success.
1770 */
1771 struct ctl_table_header *__register_sysctl_paths(
1772 struct ctl_table_root *root,
1773 struct nsproxy *namespaces,
1774 const struct ctl_path *path, struct ctl_table *table)
1775 {
1776 struct list_head *header_list;
1777 struct ctl_table_header *header;
1778 struct ctl_table *new, **prevp;
1779 unsigned int n, npath;
1780
1781 /* Count the path components */
1782 for (npath = 0; path[npath].ctl_name || path[npath].procname; ++npath)
1783 ;
1784
1785 /*
1786 * For each path component, allocate a 2-element ctl_table array.
1787 * The first array element will be filled with the sysctl entry
1788 * for this, the second will be the sentinel (ctl_name == 0).
1789 *
1790 * We allocate everything in one go so that we don't have to
1791 * worry about freeing additional memory in unregister_sysctl_table.
1792 */
1793 header = kzalloc(sizeof(struct ctl_table_header) +
1794 (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL);
1795 if (!header)
1796 return NULL;
1797
1798 new = (struct ctl_table *) (header + 1);
1799
1800 /* Now connect the dots */
1801 prevp = &header->ctl_table;
1802 for (n = 0; n < npath; ++n, ++path) {
1803 /* Copy the procname */
1804 new->procname = path->procname;
1805 new->ctl_name = path->ctl_name;
1806 new->mode = 0555;
1807
1808 *prevp = new;
1809 prevp = &new->child;
1810
1811 new += 2;
1812 }
1813 *prevp = table;
1814 header->ctl_table_arg = table;
1815
1816 INIT_LIST_HEAD(&header->ctl_entry);
1817 header->used = 0;
1818 header->unregistering = NULL;
1819 header->root = root;
1820 sysctl_set_parent(NULL, header->ctl_table);
1821 if (sysctl_check_table(namespaces, header->ctl_table)) {
1822 kfree(header);
1823 return NULL;
1824 }
1825 spin_lock(&sysctl_lock);
1826 header_list = lookup_header_list(root, namespaces);
1827 list_add_tail(&header->ctl_entry, header_list);
1828 spin_unlock(&sysctl_lock);
1829
1830 return header;
1831 }
1832
1833 /**
1834 * register_sysctl_table_path - register a sysctl table hierarchy
1835 * @path: The path to the directory the sysctl table is in.
1836 * @table: the top-level table structure
1837 *
1838 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1839 * array. A completely 0 filled entry terminates the table.
1840 *
1841 * See __register_sysctl_paths for more details.
1842 */
1843 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
1844 struct ctl_table *table)
1845 {
1846 return __register_sysctl_paths(&sysctl_table_root, current->nsproxy,
1847 path, table);
1848 }
1849
1850 /**
1851 * register_sysctl_table - register a sysctl table hierarchy
1852 * @table: the top-level table structure
1853 *
1854 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1855 * array. A completely 0 filled entry terminates the table.
1856 *
1857 * See register_sysctl_paths for more details.
1858 */
1859 struct ctl_table_header *register_sysctl_table(struct ctl_table *table)
1860 {
1861 static const struct ctl_path null_path[] = { {} };
1862
1863 return register_sysctl_paths(null_path, table);
1864 }
1865
1866 /**
1867 * unregister_sysctl_table - unregister a sysctl table hierarchy
1868 * @header: the header returned from register_sysctl_table
1869 *
1870 * Unregisters the sysctl table and all children. proc entries may not
1871 * actually be removed until they are no longer used by anyone.
1872 */
1873 void unregister_sysctl_table(struct ctl_table_header * header)
1874 {
1875 might_sleep();
1876
1877 if (header == NULL)
1878 return;
1879
1880 spin_lock(&sysctl_lock);
1881 start_unregistering(header);
1882 spin_unlock(&sysctl_lock);
1883 kfree(header);
1884 }
1885
1886 #else /* !CONFIG_SYSCTL */
1887 struct ctl_table_header *register_sysctl_table(struct ctl_table * table)
1888 {
1889 return NULL;
1890 }
1891
1892 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
1893 struct ctl_table *table)
1894 {
1895 return NULL;
1896 }
1897
1898 void unregister_sysctl_table(struct ctl_table_header * table)
1899 {
1900 }
1901
1902 #endif /* CONFIG_SYSCTL */
1903
1904 /*
1905 * /proc/sys support
1906 */
1907
1908 #ifdef CONFIG_PROC_SYSCTL
1909
1910 static int _proc_do_string(void* data, int maxlen, int write,
1911 struct file *filp, void __user *buffer,
1912 size_t *lenp, loff_t *ppos)
1913 {
1914 size_t len;
1915 char __user *p;
1916 char c;
1917
1918 if (!data || !maxlen || !*lenp) {
1919 *lenp = 0;
1920 return 0;
1921 }
1922
1923 if (write) {
1924 len = 0;
1925 p = buffer;
1926 while (len < *lenp) {
1927 if (get_user(c, p++))
1928 return -EFAULT;
1929 if (c == 0 || c == '\n')
1930 break;
1931 len++;
1932 }
1933 if (len >= maxlen)
1934 len = maxlen-1;
1935 if(copy_from_user(data, buffer, len))
1936 return -EFAULT;
1937 ((char *) data)[len] = 0;
1938 *ppos += *lenp;
1939 } else {
1940 len = strlen(data);
1941 if (len > maxlen)
1942 len = maxlen;
1943
1944 if (*ppos > len) {
1945 *lenp = 0;
1946 return 0;
1947 }
1948
1949 data += *ppos;
1950 len -= *ppos;
1951
1952 if (len > *lenp)
1953 len = *lenp;
1954 if (len)
1955 if(copy_to_user(buffer, data, len))
1956 return -EFAULT;
1957 if (len < *lenp) {
1958 if(put_user('\n', ((char __user *) buffer) + len))
1959 return -EFAULT;
1960 len++;
1961 }
1962 *lenp = len;
1963 *ppos += len;
1964 }
1965 return 0;
1966 }
1967
1968 /**
1969 * proc_dostring - read a string sysctl
1970 * @table: the sysctl table
1971 * @write: %TRUE if this is a write to the sysctl file
1972 * @filp: the file structure
1973 * @buffer: the user buffer
1974 * @lenp: the size of the user buffer
1975 * @ppos: file position
1976 *
1977 * Reads/writes a string from/to the user buffer. If the kernel
1978 * buffer provided is not large enough to hold the string, the
1979 * string is truncated. The copied string is %NULL-terminated.
1980 * If the string is being read by the user process, it is copied
1981 * and a newline '\n' is added. It is truncated if the buffer is
1982 * not large enough.
1983 *
1984 * Returns 0 on success.
1985 */
1986 int proc_dostring(struct ctl_table *table, int write, struct file *filp,
1987 void __user *buffer, size_t *lenp, loff_t *ppos)
1988 {
1989 return _proc_do_string(table->data, table->maxlen, write, filp,
1990 buffer, lenp, ppos);
1991 }
1992
1993
1994 static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp,
1995 int *valp,
1996 int write, void *data)
1997 {
1998 if (write) {
1999 *valp = *negp ? -*lvalp : *lvalp;
2000 } else {
2001 int val = *valp;
2002 if (val < 0) {
2003 *negp = -1;
2004 *lvalp = (unsigned long)-val;
2005 } else {
2006 *negp = 0;
2007 *lvalp = (unsigned long)val;
2008 }
2009 }
2010 return 0;
2011 }
2012
2013 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
2014 int write, struct file *filp, void __user *buffer,
2015 size_t *lenp, loff_t *ppos,
2016 int (*conv)(int *negp, unsigned long *lvalp, int *valp,
2017 int write, void *data),
2018 void *data)
2019 {
2020 #define TMPBUFLEN 21
2021 int *i, vleft, first=1, neg, val;
2022 unsigned long lval;
2023 size_t left, len;
2024
2025 char buf[TMPBUFLEN], *p;
2026 char __user *s = buffer;
2027
2028 if (!tbl_data || !table->maxlen || !*lenp ||
2029 (*ppos && !write)) {
2030 *lenp = 0;
2031 return 0;
2032 }
2033
2034 i = (int *) tbl_data;
2035 vleft = table->maxlen / sizeof(*i);
2036 left = *lenp;
2037
2038 if (!conv)
2039 conv = do_proc_dointvec_conv;
2040
2041 for (; left && vleft--; i++, first=0) {
2042 if (write) {
2043 while (left) {
2044 char c;
2045 if (get_user(c, s))
2046 return -EFAULT;
2047 if (!isspace(c))
2048 break;
2049 left--;
2050 s++;
2051 }
2052 if (!left)
2053 break;
2054 neg = 0;
2055 len = left;
2056 if (len > sizeof(buf) - 1)
2057 len = sizeof(buf) - 1;
2058 if (copy_from_user(buf, s, len))
2059 return -EFAULT;
2060 buf[len] = 0;
2061 p = buf;
2062 if (*p == '-' && left > 1) {
2063 neg = 1;
2064 p++;
2065 }
2066 if (*p < '' || *p > '9')
2067 break;
2068
2069 lval = simple_strtoul(p, &p, 0);
2070
2071 len = p-buf;
2072 if ((len < left) && *p && !isspace(*p))
2073 break;
2074 if (neg)
2075 val = -val;
2076 s += len;
2077 left -= len;
2078
2079 if (conv(&neg, &lval, i, 1, data))
2080 break;
2081 } else {
2082 p = buf;
2083 if (!first)
2084 *p++ = '\t';
2085
2086 if (conv(&neg, &lval, i, 0, data))
2087 break;
2088
2089 sprintf(p, "%s%lu", neg ? "-" : "", lval);
2090 len = strlen(buf);
2091 if (len > left)
2092 len = left;
2093 if(copy_to_user(s, buf, len))
2094 return -EFAULT;
2095 left -= len;
2096 s += len;
2097 }
2098 }
2099
2100 if (!write && !first && left) {
2101 if(put_user('\n', s))
2102 return -EFAULT;
2103 left--, s++;
2104 }
2105 if (write) {
2106 while (left) {
2107 char c;
2108 if (get_user(c, s++))
2109 return -EFAULT;
2110 if (!isspace(c))
2111 break;
2112 left--;
2113 }
2114 }
2115 if (write && first)
2116 return -EINVAL;
2117 *lenp -= left;
2118 *ppos += *lenp;
2119 return 0;
2120 #undef TMPBUFLEN
2121 }
2122
2123 static int do_proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2124 void __user *buffer, size_t *lenp, loff_t *ppos,
2125 int (*conv)(int *negp, unsigned long *lvalp, int *valp,
2126 int write, void *data),
2127 void *data)
2128 {
2129 return __do_proc_dointvec(table->data, table, write, filp,
2130 buffer, lenp, ppos, conv, data);
2131 }
2132
2133 /**
2134 * proc_dointvec - read a vector of integers
2135 * @table: the sysctl table
2136 * @write: %TRUE if this is a write to the sysctl file
2137 * @filp: the file structure
2138 * @buffer: the user buffer
2139 * @lenp: the size of the user buffer
2140 * @ppos: file position
2141 *
2142 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2143 * values from/to the user buffer, treated as an ASCII string.
2144 *
2145 * Returns 0 on success.
2146 */
2147 int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2148 void __user *buffer, size_t *lenp, loff_t *ppos)
2149 {
2150 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2151 NULL,NULL);
2152 }
2153
2154 #define OP_SET 0
2155 #define OP_AND 1
2156 #define OP_OR 2
2157
2158 static int do_proc_dointvec_bset_conv(int *negp, unsigned long *lvalp,
2159 int *valp,
2160 int write, void *data)
2161 {
2162 int op = *(int *)data;
2163 if (write) {
2164 int val = *negp ? -*lvalp : *lvalp;
2165 switch(op) {
2166 case OP_SET: *valp = val; break;
2167 case OP_AND: *valp &= val; break;
2168 case OP_OR: *valp |= val; break;
2169 }
2170 } else {
2171 int val = *valp;
2172 if (val < 0) {
2173 *negp = -1;
2174 *lvalp = (unsigned long)-val;
2175 } else {
2176 *negp = 0;
2177 *lvalp = (unsigned long)val;
2178 }
2179 }
2180 return 0;
2181 }
2182
2183 /*
2184 * Taint values can only be increased
2185 */
2186 static int proc_dointvec_taint(struct ctl_table *table, int write, struct file *filp,
2187 void __user *buffer, size_t *lenp, loff_t *ppos)
2188 {
2189 int op;
2190
2191 if (write && !capable(CAP_SYS_ADMIN))
2192 return -EPERM;
2193
2194 op = OP_OR;
2195 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2196 do_proc_dointvec_bset_conv,&op);
2197 }
2198
2199 struct do_proc_dointvec_minmax_conv_param {
2200 int *min;
2201 int *max;
2202 };
2203
2204 static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp,
2205 int *valp,
2206 int write, void *data)
2207 {
2208 struct do_proc_dointvec_minmax_conv_param *param = data;
2209 if (write) {
2210 int val = *negp ? -*lvalp : *lvalp;
2211 if ((param->min && *param->min > val) ||
2212 (param->max && *param->max < val))
2213 return -EINVAL;
2214 *valp = val;
2215 } else {
2216 int val = *valp;
2217 if (val < 0) {
2218 *negp = -1;
2219 *lvalp = (unsigned long)-val;
2220 } else {
2221 *negp = 0;
2222 *lvalp = (unsigned long)val;
2223 }
2224 }
2225 return 0;
2226 }
2227
2228 /**
2229 * proc_dointvec_minmax - read a vector of integers with min/max values
2230 * @table: the sysctl table
2231 * @write: %TRUE if this is a write to the sysctl file
2232 * @filp: the file structure
2233 * @buffer: the user buffer
2234 * @lenp: the size of the user buffer
2235 * @ppos: file position
2236 *
2237 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2238 * values from/to the user buffer, treated as an ASCII string.
2239 *
2240 * This routine will ensure the values are within the range specified by
2241 * table->extra1 (min) and table->extra2 (max).
2242 *
2243 * Returns 0 on success.
2244 */
2245 int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
2246 void __user *buffer, size_t *lenp, loff_t *ppos)
2247 {
2248 struct do_proc_dointvec_minmax_conv_param param = {
2249 .min = (int *) table->extra1,
2250 .max = (int *) table->extra2,
2251 };
2252 return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2253 do_proc_dointvec_minmax_conv, ¶m);
2254 }
2255
2256 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2257 struct file *filp,
2258 void __user *buffer,
2259 size_t *lenp, loff_t *ppos,
2260 unsigned long convmul,
2261 unsigned long convdiv)
2262 {
2263 #define TMPBUFLEN 21
2264 unsigned long *i, *min, *max, val;
2265 int vleft, first=1, neg;
2266 size_t len, left;
2267 char buf[TMPBUFLEN], *p;
2268 char __user *s = buffer;
2269
2270 if (!data || !table->maxlen || !*lenp ||
2271 (*ppos && !write)) {
2272 *lenp = 0;
2273 return 0;
2274 }
2275
2276 i = (unsigned long *) data;
2277 min = (unsigned long *) table->extra1;
2278 max = (unsigned long *) table->extra2;
2279 vleft = table->maxlen / sizeof(unsigned long);
2280 left = *lenp;
2281
2282 for (; left && vleft--; i++, min++, max++, first=0) {
2283 if (write) {
2284 while (left) {
2285 char c;
2286 if (get_user(c, s))
2287 return -EFAULT;
2288 if (!isspace(c))
2289 break;
2290 left--;
2291 s++;
2292 }
2293 if (!left)
2294 break;
2295 neg = 0;
2296 len = left;
2297 if (len > TMPBUFLEN-1)
2298 len = TMPBUFLEN-1;
2299 if (copy_from_user(buf, s, len))
2300 return -EFAULT;
2301 buf[len] = 0;
2302 p = buf;
2303 if (*p == '-' && left > 1) {
2304 neg = 1;
2305 p++;
2306 }
2307 if (*p < '' || *p > '9')
2308 break;
2309 val = simple_strtoul(p, &p, 0) * convmul / convdiv ;
2310 len = p-buf;
2311 if ((len < left) && *p && !isspace(*p))
2312 break;
2313 if (neg)
2314 val = -val;
2315 s += len;
2316 left -= len;
2317
2318 if(neg)
2319 continue;
2320 if ((min && val < *min) || (max && val > *max))
2321 continue;
2322 *i = val;
2323 } else {
2324 p = buf;
2325 if (!first)
2326 *p++ = '\t';
2327 sprintf(p, "%lu", convdiv * (*i) / convmul);
2328 len = strlen(buf);
2329 if (len > left)
2330 len = left;
2331 if(copy_to_user(s, buf, len))
2332 return -EFAULT;
2333 left -= len;
2334 s += len;
2335 }
2336 }
2337
2338 if (!write && !first && left) {
2339 if(put_user('\n', s))
2340 return -EFAULT;
2341 left--, s++;
2342 }
2343 if (write) {
2344 while (left) {
2345 char c;
2346 if (get_user(c, s++))
2347 return -EFAULT;
2348 if (!isspace(c))
2349 break;
2350 left--;
2351 }
2352 }
2353 if (write && first)
2354 return -EINVAL;
2355 *lenp -= left;
2356 *ppos += *lenp;
2357 return 0;
2358 #undef TMPBUFLEN
2359 }
2360
2361 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2362 struct file *filp,
2363 void __user *buffer,
2364 size_t *lenp, loff_t *ppos,
2365 unsigned long convmul,
2366 unsigned long convdiv)
2367 {
2368 return __do_proc_doulongvec_minmax(table->data, table, write,
2369 filp, buffer, lenp, ppos, convmul, convdiv);
2370 }
2371
2372 /**
2373 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2374 * @table: the sysctl table
2375 * @write: %TRUE if this is a write to the sysctl file
2376 * @filp: the file structure
2377 * @buffer: the user buffer
2378 * @lenp: the size of the user buffer
2379 * @ppos: file position
2380 *
2381 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2382 * values from/to the user buffer, treated as an ASCII string.
2383 *
2384 * This routine will ensure the values are within the range specified by
2385 * table->extra1 (min) and table->extra2 (max).
2386 *
2387 * Returns 0 on success.
2388 */
2389 int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
2390 void __user *buffer, size_t *lenp, loff_t *ppos)
2391 {
2392 return do_proc_doulongvec_minmax(table, write, filp, buffer, lenp, ppos, 1l, 1l);
2393 }
2394
2395 /**
2396 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2397 * @table: the sysctl table
2398 * @write: %TRUE if this is a write to the sysctl file
2399 * @filp: the file structure
2400 * @buffer: the user buffer
2401 * @lenp: the size of the user buffer
2402 * @ppos: file position
2403 *
2404 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2405 * values from/to the user buffer, treated as an ASCII string. The values
2406 * are treated as milliseconds, and converted to jiffies when they are stored.
2407 *
2408 * This routine will ensure the values are within the range specified by
2409 * table->extra1 (min) and table->extra2 (max).
2410 *
2411 * Returns 0 on success.
2412 */
2413 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2414 struct file *filp,
2415 void __user *buffer,
2416 size_t *lenp, loff_t *ppos)
2417 {
2418 return do_proc_doulongvec_minmax(table, write, filp, buffer,
2419 lenp, ppos, HZ, 1000l);
2420 }
2421
2422
2423 static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp,
2424 int *valp,
2425 int write, void *data)
2426 {
2427 if (write) {
2428 if (*lvalp > LONG_MAX / HZ)
2429 return 1;
2430 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2431 } else {
2432 int val = *valp;
2433 unsigned long lval;
2434 if (val < 0) {
2435 *negp = -1;
2436 lval = (unsigned long)-val;
2437 } else {
2438 *negp = 0;
2439 lval = (unsigned long)val;
2440 }
2441 *lvalp = lval / HZ;
2442 }
2443 return 0;
2444 }
2445
2446 static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp,
2447 int *valp,
2448 int write, void *data)
2449 {
2450 if (write) {
2451 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2452 return 1;
2453 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2454 } else {
2455 int val = *valp;
2456 unsigned long lval;
2457 if (val < 0) {
2458 *negp = -1;
2459 lval = (unsigned long)-val;
2460 } else {
2461 *negp = 0;
2462 lval = (unsigned long)val;
2463 }
2464 *lvalp = jiffies_to_clock_t(lval);
2465 }
2466 return 0;
2467 }
2468
2469 static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp,
2470 int *valp,
2471 int write, void *data)
2472 {
2473 if (write) {
2474 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2475 } else {
2476 int val = *valp;
2477 unsigned long lval;
2478 if (val < 0) {
2479 *negp = -1;
2480 lval = (unsigned long)-val;
2481 } else {
2482 *negp = 0;
2483 lval = (unsigned long)val;
2484 }
2485 *lvalp = jiffies_to_msecs(lval);
2486 }
2487 return 0;
2488 }
2489
2490 /**
2491 * proc_dointvec_jiffies - read a vector of integers as seconds
2492 * @table: the sysctl table
2493 * @write: %TRUE if this is a write to the sysctl file
2494 * @filp: the file structure
2495 * @buffer: the user buffer
2496 * @lenp: the size of the user buffer
2497 * @ppos: file position
2498 *
2499 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2500 * values from/to the user buffer, treated as an ASCII string.
2501 * The values read are assumed to be in seconds, and are converted into
2502 * jiffies.
2503 *
2504 * Returns 0 on success.
2505 */
2506 int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
2507 void __user *buffer, size_t *lenp, loff_t *ppos)
2508 {
2509 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2510 do_proc_dointvec_jiffies_conv,NULL);
2511 }
2512
2513 /**
2514 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2515 * @table: the sysctl table
2516 * @write: %TRUE if this is a write to the sysctl file
2517 * @filp: the file structure
2518 * @buffer: the user buffer
2519 * @lenp: the size of the user buffer
2520 * @ppos: pointer to the file position
2521 *
2522 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2523 * values from/to the user buffer, treated as an ASCII string.
2524 * The values read are assumed to be in 1/USER_HZ seconds, and
2525 * are converted into jiffies.
2526 *
2527 * Returns 0 on success.
2528 */
2529 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
2530 void __user *buffer, size_t *lenp, loff_t *ppos)
2531 {
2532 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2533 do_proc_dointvec_userhz_jiffies_conv,NULL);
2534 }
2535
2536 /**
2537 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2538 * @table: the sysctl table
2539 * @write: %TRUE if this is a write to the sysctl file
2540 * @filp: the file structure
2541 * @buffer: the user buffer
2542 * @lenp: the size of the user buffer
2543 * @ppos: file position
2544 * @ppos: the current position in the file
2545 *
2546 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2547 * values from/to the user buffer, treated as an ASCII string.
2548 * The values read are assumed to be in 1/1000 seconds, and
2549 * are converted into jiffies.
2550 *
2551 * Returns 0 on success.
2552 */
2553 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
2554 void __user *buffer, size_t *lenp, loff_t *ppos)
2555 {
2556 return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2557 do_proc_dointvec_ms_jiffies_conv, NULL);
2558 }
2559
2560 static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
2561 void __user *buffer, size_t *lenp, loff_t *ppos)
2562 {
2563 struct pid *new_pid;
2564 pid_t tmp;
2565 int r;
2566
2567 tmp = pid_vnr(cad_pid);
2568
2569 r = __do_proc_dointvec(&tmp, table, write, filp, buffer,
2570 lenp, ppos, NULL, NULL);
2571 if (r || !write)
2572 return r;
2573
2574 new_pid = find_get_pid(tmp);
2575 if (!new_pid)
2576 return -ESRCH;
2577
2578 put_pid(xchg(&cad_pid, new_pid));
2579 return 0;
2580 }
2581
2582 #else /* CONFIG_PROC_FS */
2583
2584 int proc_dostring(struct ctl_table *table, int write, struct file *filp,
2585 void __user *buffer, size_t *lenp, loff_t *ppos)
2586 {
2587 return -ENOSYS;
2588 }
2589
2590 int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2591 void __user *buffer, size_t *lenp, loff_t *ppos)
2592 {
2593 return -ENOSYS;
2594 }
2595
2596 int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
2597 void __user *buffer, size_t *lenp, loff_t *ppos)
2598 {
2599 return -ENOSYS;
2600 }
2601
2602 int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
2603 void __user *buffer, size_t *lenp, loff_t *ppos)
2604 {
2605 return -ENOSYS;
2606 }
2607
2608 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
2609 void __user *buffer, size_t *lenp, loff_t *ppos)
2610 {
2611 return -ENOSYS;
2612 }
2613
2614 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
2615 void __user *buffer, size_t *lenp, loff_t *ppos)
2616 {
2617 return -ENOSYS;
2618 }
2619
2620 int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
2621 void __user *buffer, size_t *lenp, loff_t *ppos)
2622 {
2623 return -ENOSYS;
2624 }
2625
2626 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2627 struct file *filp,
2628 void __user *buffer,
2629 size_t *lenp, loff_t *ppos)
2630 {
2631 return -ENOSYS;
2632 }
2633
2634
2635 #endif /* CONFIG_PROC_FS */
2636
2637
2638 #ifdef CONFIG_SYSCTL_SYSCALL
2639 /*
2640 * General sysctl support routines
2641 */
2642
2643 /* The generic sysctl data routine (used if no strategy routine supplied) */
2644 int sysctl_data(struct ctl_table *table, int __user *name, int nlen,
2645 void __user *oldval, size_t __user *oldlenp,
2646 void __user *newval, size_t newlen)
2647 {
2648 size_t len;
2649
2650 /* Get out of I don't have a variable */
2651 if (!table->data || !table->maxlen)
2652 return -ENOTDIR;
2653
2654 if (oldval && oldlenp) {
2655 if (get_user(len, oldlenp))
2656 return -EFAULT;
2657 if (len) {
2658 if (len > table->maxlen)
2659 len = table->maxlen;
2660 if (copy_to_user(oldval, table->data, len))
2661 return -EFAULT;
2662 if (put_user(len, oldlenp))
2663 return -EFAULT;
2664 }
2665 }
2666
2667 if (newval && newlen) {
2668 if (newlen > table->maxlen)
2669 newlen = table->maxlen;
2670
2671 if (copy_from_user(table->data, newval, newlen))
2672 return -EFAULT;
2673 }
2674 return 1;
2675 }
2676
2677 /* The generic string strategy routine: */
2678 int sysctl_string(struct ctl_table *table, int __user *name, int nlen,
2679 void __user *oldval, size_t __user *oldlenp,
2680 void __user *newval, size_t newlen)
2681 {
2682 if (!table->data || !table->maxlen)
2683 return -ENOTDIR;
2684
2685 if (oldval && oldlenp) {
2686 size_t bufsize;
2687 if (get_user(bufsize, oldlenp))
2688 return -EFAULT;
2689 if (bufsize) {
2690 size_t len = strlen(table->data), copied;
2691
2692 /* This shouldn't trigger for a well-formed sysctl */
2693 if (len > table->maxlen)
2694 len = table->maxlen;
2695
2696 /* Copy up to a max of bufsize-1 bytes of the string */
2697 copied = (len >= bufsize) ? bufsize - 1 : len;
2698
2699 if (copy_to_user(oldval, table->data, copied) ||
2700 put_user(0, (char __user *)(oldval + copied)))
2701 return -EFAULT;
2702 if (put_user(len, oldlenp))
2703 return -EFAULT;
2704 }
2705 }
2706 if (newval && newlen) {
2707 size_t len = newlen;
2708 if (len > table->maxlen)
2709 len = table->maxlen;
2710 if(copy_from_user(table->data, newval, len))
2711 return -EFAULT;
2712 if (len == table->maxlen)
2713 len--;
2714 ((char *) table->data)[len] = 0;
2715 }
2716 return 1;
2717 }
2718
2719 /*
2720 * This function makes sure that all of the integers in the vector
2721 * are between the minimum and maximum values given in the arrays
2722 * table->extra1 and table->extra2, respectively.
2723 */
2724 int sysctl_intvec(struct ctl_table *table, int __user *name, int nlen,
2725 void __user *oldval, size_t __user *oldlenp,
2726 void __user *newval, size_t newlen)
2727 {
2728
2729 if (newval && newlen) {
2730 int __user *vec = (int __user *) newval;
2731 int *min = (int *) table->extra1;
2732 int *max = (int *) table->extra2;
2733 size_t length;
2734 int i;
2735
2736 if (newlen % sizeof(int) != 0)
2737 return -EINVAL;
2738
2739 if (!table->extra1 && !table->extra2)
2740 return 0;
2741
2742 if (newlen > table->maxlen)
2743 newlen = table->maxlen;
2744 length = newlen / sizeof(int);
2745
2746 for (i = 0; i < length; i++) {
2747 int value;
2748 if (get_user(value, vec + i))
2749 return -EFAULT;
2750 if (min && value < min[i])
2751 return -EINVAL;
2752 if (max && value > max[i])
2753 return -EINVAL;
2754 }
2755 }
2756 return 0;
2757 }
2758
2759 /* Strategy function to convert jiffies to seconds */
2760 int sysctl_jiffies(struct ctl_table *table, int __user *name, int nlen,
2761 void __user *oldval, size_t __user *oldlenp,
2762 void __user *newval, size_t newlen)
2763 {
2764 if (oldval && oldlenp) {
2765 size_t olen;
2766
2767 if (get_user(olen, oldlenp))
2768 return -EFAULT;
2769 if (olen) {
2770 int val;
2771
2772 if (olen < sizeof(int))
2773 return -EINVAL;
2774
2775 val = *(int *)(table->data) / HZ;
2776 if (put_user(val, (int __user *)oldval))
2777 return -EFAULT;
2778 if (put_user(sizeof(int), oldlenp))
2779 return -EFAULT;
2780 }
2781 }
2782 if (newval && newlen) {
2783 int new;
2784 if (newlen != sizeof(int))
2785 return -EINVAL;
2786 if (get_user(new, (int __user *)newval))
2787 return -EFAULT;
2788 *(int *)(table->data) = new*HZ;
2789 }
2790 return 1;
2791 }
2792
2793 /* Strategy function to convert jiffies to seconds */
2794 int sysctl_ms_jiffies(struct ctl_table *table, int __user *name, int nlen,
2795 void __user *oldval, size_t __user *oldlenp,
2796 void __user *newval, size_t newlen)
2797 {
2798 if (oldval && oldlenp) {
2799 size_t olen;
2800
2801 if (get_user(olen, oldlenp))
2802 return -EFAULT;
2803 if (olen) {
2804 int val;
2805
2806 if (olen < sizeof(int))
2807 return -EINVAL;
2808
2809 val = jiffies_to_msecs(*(int *)(table->data));
2810 if (put_user(val, (int __user *)oldval))
2811 return -EFAULT;
2812 if (put_user(sizeof(int), oldlenp))
2813 return -EFAULT;
2814 }
2815 }
2816 if (newval && newlen) {
2817 int new;
2818 if (newlen != sizeof(int))
2819 return -EINVAL;
2820 if (get_user(new, (int __user *)newval))
2821 return -EFAULT;
2822 *(int *)(table->data) = msecs_to_jiffies(new);
2823 }
2824 return 1;
2825 }
2826
2827
2828
2829 #else /* CONFIG_SYSCTL_SYSCALL */
2830
2831
2832 asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
2833 {
2834 struct __sysctl_args tmp;
2835 int error;
2836
2837 if (copy_from_user(&tmp, args, sizeof(tmp)))
2838 return -EFAULT;
2839
2840 error = deprecated_sysctl_warning(&tmp);
2841
2842 /* If no error reading the parameters then just -ENOSYS ... */
2843 if (!error)
2844 error = -ENOSYS;
2845
2846 return error;
2847 }
2848
2849 int sysctl_data(struct ctl_table *table, int __user *name, int nlen,
2850 void __user *oldval, size_t __user *oldlenp,
2851 void __user *newval, size_t newlen)
2852 {
2853 return -ENOSYS;
2854 }
2855
2856 int sysctl_string(struct ctl_table *table, int __user *name, int nlen,
2857 void __user *oldval, size_t __user *oldlenp,
2858 void __user *newval, size_t newlen)
2859 {
2860 return -ENOSYS;
2861 }
2862
2863 int sysctl_intvec(struct ctl_table *table, int __user *name, int nlen,
2864 void __user *oldval, size_t __user *oldlenp,
2865 void __user *newval, size_t newlen)
2866 {
2867 return -ENOSYS;
2868 }
2869
2870 int sysctl_jiffies(struct ctl_table *table, int __user *name, int nlen,
2871 void __user *oldval, size_t __user *oldlenp,
2872 void __user *newval, size_t newlen)
2873 {
2874 return -ENOSYS;
2875 }
2876
2877 int sysctl_ms_jiffies(struct ctl_table *table, int __user *name, int nlen,
2878 void __user *oldval, size_t __user *oldlenp,
2879 void __user *newval, size_t newlen)
2880 {
2881 return -ENOSYS;
2882 }
2883
2884 #endif /* CONFIG_SYSCTL_SYSCALL */
2885
2886 static int deprecated_sysctl_warning(struct __sysctl_args *args)
2887 {
2888 static int msg_count;
2889 int name[CTL_MAXNAME];
2890 int i;
2891
2892 /* Check args->nlen. */
2893 if (args->nlen < 0 || args->nlen > CTL_MAXNAME)
2894 return -ENOTDIR;
2895
2896 /* Read in the sysctl name for better debug message logging */
2897 for (i = 0; i < args->nlen; i++)
2898 if (get_user(name[i], args->name + i))
2899 return -EFAULT;
2900
2901 /* Ignore accesses to kernel.version */
2902 if ((args->nlen == 2) && (name[0] == CTL_KERN) && (name[1] == KERN_VERSION))
2903 return 0;
2904
2905 if (msg_count < 5) {
2906 msg_count++;
2907 printk(KERN_INFO
2908 "warning: process `%s' used the deprecated sysctl "
2909 "system call with ", current->comm);
2910 for (i = 0; i < args->nlen; i++)
2911 printk("%d.", name[i]);
2912 printk("\n");
2913 }
2914 return 0;
2915 }
2916
2917 /*
2918 * No sense putting this after each symbol definition, twice,
2919 * exception granted :-)
2920 */
2921 EXPORT_SYMBOL(proc_dointvec);
2922 EXPORT_SYMBOL(proc_dointvec_jiffies);
2923 EXPORT_SYMBOL(proc_dointvec_minmax);
2924 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2925 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2926 EXPORT_SYMBOL(proc_dostring);
2927 EXPORT_SYMBOL(proc_doulongvec_minmax);
2928 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
2929 EXPORT_SYMBOL(register_sysctl_table);
2930 EXPORT_SYMBOL(register_sysctl_paths);
2931 EXPORT_SYMBOL(sysctl_intvec);
2932 EXPORT_SYMBOL(sysctl_jiffies);
2933 EXPORT_SYMBOL(sysctl_ms_jiffies);
2934 EXPORT_SYMBOL(sysctl_string);
2935 EXPORT_SYMBOL(sysctl_data);
2936 EXPORT_SYMBOL(unregister_sysctl_table);
2937
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