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V4L/DVB (6803): buf-core.c locking fixes
[linux-2.6/sactl.git] / kernel / sysctl.c
blob8ac51714b08ca7ec4261b8544fc62524dad8a3e4
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/security.h>
41 #include <linux/initrd.h>
42 #include <linux/times.h>
43 #include <linux/limits.h>
44 #include <linux/dcache.h>
45 #include <linux/syscalls.h>
46 #include <linux/nfs_fs.h>
47 #include <linux/acpi.h>
48 #include <linux/reboot.h>
49
50 #include <asm/uaccess.h>
51 #include <asm/processor.h>
52
53 #ifdef CONFIG_X86
54 #include <asm/nmi.h>
55 #include <asm/stacktrace.h>
56 #endif
57
58 static int deprecated_sysctl_warning(struct __sysctl_args *args);
59
60 #if defined(CONFIG_SYSCTL)
61
62 /* External variables not in a header file. */
63 extern int C_A_D;
64 extern int print_fatal_signals;
65 extern int sysctl_overcommit_memory;
66 extern int sysctl_overcommit_ratio;
67 extern int sysctl_panic_on_oom;
68 extern int sysctl_oom_kill_allocating_task;
69 extern int max_threads;
70 extern int core_uses_pid;
71 extern int suid_dumpable;
72 extern char core_pattern[];
73 extern int pid_max;
74 extern int min_free_kbytes;
75 extern int printk_ratelimit_jiffies;
76 extern int printk_ratelimit_burst;
77 extern int pid_max_min, pid_max_max;
78 extern int sysctl_drop_caches;
79 extern int percpu_pagelist_fraction;
80 extern int compat_log;
81 extern int maps_protect;
82 extern int sysctl_stat_interval;
83 extern int audit_argv_kb;
84
85 /* Constants used for minimum and maximum */
86 #ifdef CONFIG_DETECT_SOFTLOCKUP
87 static int one = 1;
88 static int sixty = 60;
89 #endif
90
91 #ifdef CONFIG_MMU
92 static int two = 2;
93 #endif
94
95 static int zero;
96 static int one_hundred = 100;
97
98 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
99 static int maxolduid = 65535;
100 static int minolduid;
101 static int min_percpu_pagelist_fract = 8;
102
103 static int ngroups_max = NGROUPS_MAX;
104
105 #ifdef CONFIG_KMOD
106 extern char modprobe_path[];
107 #endif
108 #ifdef CONFIG_CHR_DEV_SG
109 extern int sg_big_buff;
110 #endif
111
112 #ifdef __sparc__
113 extern char reboot_command [];
114 extern int stop_a_enabled;
115 extern int scons_pwroff;
116 #endif
117
118 #ifdef __hppa__
119 extern int pwrsw_enabled;
120 extern int unaligned_enabled;
121 #endif
122
123 #ifdef CONFIG_S390
124 #ifdef CONFIG_MATHEMU
125 extern int sysctl_ieee_emulation_warnings;
126 #endif
127 extern int sysctl_userprocess_debug;
128 extern int spin_retry;
129 #endif
130
131 extern int sysctl_hz_timer;
132
133 #ifdef CONFIG_BSD_PROCESS_ACCT
134 extern int acct_parm[];
135 #endif
136
137 #ifdef CONFIG_IA64
138 extern int no_unaligned_warning;
139 #endif
140
141 #ifdef CONFIG_RT_MUTEXES
142 extern int max_lock_depth;
143 #endif
144
145 #ifdef CONFIG_SYSCTL_SYSCALL
146 static int parse_table(int __user *, int, void __user *, size_t __user *,
147 void __user *, size_t, struct ctl_table *);
148 #endif
149
150
151 #ifdef CONFIG_PROC_SYSCTL
152 static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
153 void __user *buffer, size_t *lenp, loff_t *ppos);
154 static int proc_dointvec_taint(struct ctl_table *table, int write, struct file *filp,
155 void __user *buffer, size_t *lenp, loff_t *ppos);
156 #endif
157
158 static struct ctl_table root_table[];
159 static struct ctl_table_header root_table_header =
160 { root_table, LIST_HEAD_INIT(root_table_header.ctl_entry) };
161
162 static struct ctl_table kern_table[];
163 static struct ctl_table vm_table[];
164 static struct ctl_table fs_table[];
165 static struct ctl_table debug_table[];
166 static struct ctl_table dev_table[];
167 extern struct ctl_table random_table[];
168 #ifdef CONFIG_INOTIFY_USER
169 extern struct ctl_table inotify_table[];
170 #endif
171
172 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
173 int sysctl_legacy_va_layout;
174 #endif
175
176 extern int prove_locking;
177 extern int lock_stat;
178
179 /* The default sysctl tables: */
180
181 static struct ctl_table root_table[] = {
182 {
183 .ctl_name = CTL_KERN,
184 .procname = "kernel",
185 .mode = 0555,
186 .child = kern_table,
187 },
188 {
189 .ctl_name = CTL_VM,
190 .procname = "vm",
191 .mode = 0555,
192 .child = vm_table,
193 },
194 #ifdef CONFIG_NET
195 {
196 .ctl_name = CTL_NET,
197 .procname = "net",
198 .mode = 0555,
199 .child = net_table,
200 },
201 #endif
202 {
203 .ctl_name = CTL_FS,
204 .procname = "fs",
205 .mode = 0555,
206 .child = fs_table,
207 },
208 {
209 .ctl_name = CTL_DEBUG,
210 .procname = "debug",
211 .mode = 0555,
212 .child = debug_table,
213 },
214 {
215 .ctl_name = CTL_DEV,
216 .procname = "dev",
217 .mode = 0555,
218 .child = dev_table,
219 },
220 /*
221 * NOTE: do not add new entries to this table unless you have read
222 * Documentation/sysctl/ctl_unnumbered.txt
223 */
224 { .ctl_name = 0 }
225 };
226
227 #ifdef CONFIG_SCHED_DEBUG
228 static unsigned long min_sched_granularity_ns = 100000; /* 100 usecs */
229 static unsigned long max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */
230 static unsigned long min_wakeup_granularity_ns; /* 0 usecs */
231 static unsigned long max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */
232 #endif
233
234 static struct ctl_table kern_table[] = {
235 #ifdef CONFIG_SCHED_DEBUG
236 {
237 .ctl_name = CTL_UNNUMBERED,
238 .procname = "sched_min_granularity_ns",
239 .data = &sysctl_sched_min_granularity,
240 .maxlen = sizeof(unsigned int),
241 .mode = 0644,
242 .proc_handler = &sched_nr_latency_handler,
243 .strategy = &sysctl_intvec,
244 .extra1 = &min_sched_granularity_ns,
245 .extra2 = &max_sched_granularity_ns,
246 },
247 {
248 .ctl_name = CTL_UNNUMBERED,
249 .procname = "sched_latency_ns",
250 .data = &sysctl_sched_latency,
251 .maxlen = sizeof(unsigned int),
252 .mode = 0644,
253 .proc_handler = &sched_nr_latency_handler,
254 .strategy = &sysctl_intvec,
255 .extra1 = &min_sched_granularity_ns,
256 .extra2 = &max_sched_granularity_ns,
257 },
258 {
259 .ctl_name = CTL_UNNUMBERED,
260 .procname = "sched_wakeup_granularity_ns",
261 .data = &sysctl_sched_wakeup_granularity,
262 .maxlen = sizeof(unsigned int),
263 .mode = 0644,
264 .proc_handler = &proc_dointvec_minmax,
265 .strategy = &sysctl_intvec,
266 .extra1 = &min_wakeup_granularity_ns,
267 .extra2 = &max_wakeup_granularity_ns,
268 },
269 {
270 .ctl_name = CTL_UNNUMBERED,
271 .procname = "sched_batch_wakeup_granularity_ns",
272 .data = &sysctl_sched_batch_wakeup_granularity,
273 .maxlen = sizeof(unsigned int),
274 .mode = 0644,
275 .proc_handler = &proc_dointvec_minmax,
276 .strategy = &sysctl_intvec,
277 .extra1 = &min_wakeup_granularity_ns,
278 .extra2 = &max_wakeup_granularity_ns,
279 },
280 {
281 .ctl_name = CTL_UNNUMBERED,
282 .procname = "sched_child_runs_first",
283 .data = &sysctl_sched_child_runs_first,
284 .maxlen = sizeof(unsigned int),
285 .mode = 0644,
286 .proc_handler = &proc_dointvec,
287 },
288 {
289 .ctl_name = CTL_UNNUMBERED,
290 .procname = "sched_features",
291 .data = &sysctl_sched_features,
292 .maxlen = sizeof(unsigned int),
293 .mode = 0644,
294 .proc_handler = &proc_dointvec,
295 },
296 {
297 .ctl_name = CTL_UNNUMBERED,
298 .procname = "sched_migration_cost",
299 .data = &sysctl_sched_migration_cost,
300 .maxlen = sizeof(unsigned int),
301 .mode = 0644,
302 .proc_handler = &proc_dointvec,
303 },
304 {
305 .ctl_name = CTL_UNNUMBERED,
306 .procname = "sched_nr_migrate",
307 .data = &sysctl_sched_nr_migrate,
308 .maxlen = sizeof(unsigned int),
309 .mode = 644,
310 .proc_handler = &proc_dointvec,
311 },
312 #endif
313 {
314 .ctl_name = CTL_UNNUMBERED,
315 .procname = "sched_compat_yield",
316 .data = &sysctl_sched_compat_yield,
317 .maxlen = sizeof(unsigned int),
318 .mode = 0644,
319 .proc_handler = &proc_dointvec,
320 },
321 #ifdef CONFIG_PROVE_LOCKING
322 {
323 .ctl_name = CTL_UNNUMBERED,
324 .procname = "prove_locking",
325 .data = &prove_locking,
326 .maxlen = sizeof(int),
327 .mode = 0644,
328 .proc_handler = &proc_dointvec,
329 },
330 #endif
331 #ifdef CONFIG_LOCK_STAT
332 {
333 .ctl_name = CTL_UNNUMBERED,
334 .procname = "lock_stat",
335 .data = &lock_stat,
336 .maxlen = sizeof(int),
337 .mode = 0644,
338 .proc_handler = &proc_dointvec,
339 },
340 #endif
341 {
342 .ctl_name = KERN_PANIC,
343 .procname = "panic",
344 .data = &panic_timeout,
345 .maxlen = sizeof(int),
346 .mode = 0644,
347 .proc_handler = &proc_dointvec,
348 },
349 {
350 .ctl_name = KERN_CORE_USES_PID,
351 .procname = "core_uses_pid",
352 .data = &core_uses_pid,
353 .maxlen = sizeof(int),
354 .mode = 0644,
355 .proc_handler = &proc_dointvec,
356 },
357 #ifdef CONFIG_AUDITSYSCALL
358 {
359 .ctl_name = CTL_UNNUMBERED,
360 .procname = "audit_argv_kb",
361 .data = &audit_argv_kb,
362 .maxlen = sizeof(int),
363 .mode = 0644,
364 .proc_handler = &proc_dointvec,
365 },
366 #endif
367 {
368 .ctl_name = KERN_CORE_PATTERN,
369 .procname = "core_pattern",
370 .data = core_pattern,
371 .maxlen = CORENAME_MAX_SIZE,
372 .mode = 0644,
373 .proc_handler = &proc_dostring,
374 .strategy = &sysctl_string,
375 },
376 #ifdef CONFIG_PROC_SYSCTL
377 {
378 .procname = "tainted",
379 .data = &tainted,
380 .maxlen = sizeof(int),
381 .mode = 0644,
382 .proc_handler = &proc_dointvec_taint,
383 },
384 #endif
385 #ifdef CONFIG_SECURITY_CAPABILITIES
386 {
387 .procname = "cap-bound",
388 .data = &cap_bset,
389 .maxlen = sizeof(kernel_cap_t),
390 .mode = 0600,
391 .proc_handler = &proc_dointvec_bset,
392 },
393 #endif /* def CONFIG_SECURITY_CAPABILITIES */
394 #ifdef CONFIG_BLK_DEV_INITRD
395 {
396 .ctl_name = KERN_REALROOTDEV,
397 .procname = "real-root-dev",
398 .data = &real_root_dev,
399 .maxlen = sizeof(int),
400 .mode = 0644,
401 .proc_handler = &proc_dointvec,
402 },
403 #endif
404 {
405 .ctl_name = CTL_UNNUMBERED,
406 .procname = "print-fatal-signals",
407 .data = &print_fatal_signals,
408 .maxlen = sizeof(int),
409 .mode = 0644,
410 .proc_handler = &proc_dointvec,
411 },
412 #ifdef __sparc__
413 {
414 .ctl_name = KERN_SPARC_REBOOT,
415 .procname = "reboot-cmd",
416 .data = reboot_command,
417 .maxlen = 256,
418 .mode = 0644,
419 .proc_handler = &proc_dostring,
420 .strategy = &sysctl_string,
421 },
422 {
423 .ctl_name = KERN_SPARC_STOP_A,
424 .procname = "stop-a",
425 .data = &stop_a_enabled,
426 .maxlen = sizeof (int),
427 .mode = 0644,
428 .proc_handler = &proc_dointvec,
429 },
430 {
431 .ctl_name = KERN_SPARC_SCONS_PWROFF,
432 .procname = "scons-poweroff",
433 .data = &scons_pwroff,
434 .maxlen = sizeof (int),
435 .mode = 0644,
436 .proc_handler = &proc_dointvec,
437 },
438 #endif
439 #ifdef __hppa__
440 {
441 .ctl_name = KERN_HPPA_PWRSW,
442 .procname = "soft-power",
443 .data = &pwrsw_enabled,
444 .maxlen = sizeof (int),
445 .mode = 0644,
446 .proc_handler = &proc_dointvec,
447 },
448 {
449 .ctl_name = KERN_HPPA_UNALIGNED,
450 .procname = "unaligned-trap",
451 .data = &unaligned_enabled,
452 .maxlen = sizeof (int),
453 .mode = 0644,
454 .proc_handler = &proc_dointvec,
455 },
456 #endif
457 {
458 .ctl_name = KERN_CTLALTDEL,
459 .procname = "ctrl-alt-del",
460 .data = &C_A_D,
461 .maxlen = sizeof(int),
462 .mode = 0644,
463 .proc_handler = &proc_dointvec,
464 },
465 {
466 .ctl_name = KERN_PRINTK,
467 .procname = "printk",
468 .data = &console_loglevel,
469 .maxlen = 4*sizeof(int),
470 .mode = 0644,
471 .proc_handler = &proc_dointvec,
472 },
473 #ifdef CONFIG_KMOD
474 {
475 .ctl_name = KERN_MODPROBE,
476 .procname = "modprobe",
477 .data = &modprobe_path,
478 .maxlen = KMOD_PATH_LEN,
479 .mode = 0644,
480 .proc_handler = &proc_dostring,
481 .strategy = &sysctl_string,
482 },
483 #endif
484 #if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET)
485 {
486 .ctl_name = KERN_HOTPLUG,
487 .procname = "hotplug",
488 .data = &uevent_helper,
489 .maxlen = UEVENT_HELPER_PATH_LEN,
490 .mode = 0644,
491 .proc_handler = &proc_dostring,
492 .strategy = &sysctl_string,
493 },
494 #endif
495 #ifdef CONFIG_CHR_DEV_SG
496 {
497 .ctl_name = KERN_SG_BIG_BUFF,
498 .procname = "sg-big-buff",
499 .data = &sg_big_buff,
500 .maxlen = sizeof (int),
501 .mode = 0444,
502 .proc_handler = &proc_dointvec,
503 },
504 #endif
505 #ifdef CONFIG_BSD_PROCESS_ACCT
506 {
507 .ctl_name = KERN_ACCT,
508 .procname = "acct",
509 .data = &acct_parm,
510 .maxlen = 3*sizeof(int),
511 .mode = 0644,
512 .proc_handler = &proc_dointvec,
513 },
514 #endif
515 #ifdef CONFIG_MAGIC_SYSRQ
516 {
517 .ctl_name = KERN_SYSRQ,
518 .procname = "sysrq",
519 .data = &__sysrq_enabled,
520 .maxlen = sizeof (int),
521 .mode = 0644,
522 .proc_handler = &proc_dointvec,
523 },
524 #endif
525 #ifdef CONFIG_PROC_SYSCTL
526 {
527 .procname = "cad_pid",
528 .data = NULL,
529 .maxlen = sizeof (int),
530 .mode = 0600,
531 .proc_handler = &proc_do_cad_pid,
532 },
533 #endif
534 {
535 .ctl_name = KERN_MAX_THREADS,
536 .procname = "threads-max",
537 .data = &max_threads,
538 .maxlen = sizeof(int),
539 .mode = 0644,
540 .proc_handler = &proc_dointvec,
541 },
542 {
543 .ctl_name = KERN_RANDOM,
544 .procname = "random",
545 .mode = 0555,
546 .child = random_table,
547 },
548 {
549 .ctl_name = KERN_OVERFLOWUID,
550 .procname = "overflowuid",
551 .data = &overflowuid,
552 .maxlen = sizeof(int),
553 .mode = 0644,
554 .proc_handler = &proc_dointvec_minmax,
555 .strategy = &sysctl_intvec,
556 .extra1 = &minolduid,
557 .extra2 = &maxolduid,
558 },
559 {
560 .ctl_name = KERN_OVERFLOWGID,
561 .procname = "overflowgid",
562 .data = &overflowgid,
563 .maxlen = sizeof(int),
564 .mode = 0644,
565 .proc_handler = &proc_dointvec_minmax,
566 .strategy = &sysctl_intvec,
567 .extra1 = &minolduid,
568 .extra2 = &maxolduid,
569 },
570 #ifdef CONFIG_S390
571 #ifdef CONFIG_MATHEMU
572 {
573 .ctl_name = KERN_IEEE_EMULATION_WARNINGS,
574 .procname = "ieee_emulation_warnings",
575 .data = &sysctl_ieee_emulation_warnings,
576 .maxlen = sizeof(int),
577 .mode = 0644,
578 .proc_handler = &proc_dointvec,
579 },
580 #endif
581 #ifdef CONFIG_NO_IDLE_HZ
582 {
583 .ctl_name = KERN_HZ_TIMER,
584 .procname = "hz_timer",
585 .data = &sysctl_hz_timer,
586 .maxlen = sizeof(int),
587 .mode = 0644,
588 .proc_handler = &proc_dointvec,
589 },
590 #endif
591 {
592 .ctl_name = KERN_S390_USER_DEBUG_LOGGING,
593 .procname = "userprocess_debug",
594 .data = &sysctl_userprocess_debug,
595 .maxlen = sizeof(int),
596 .mode = 0644,
597 .proc_handler = &proc_dointvec,
598 },
599 #endif
600 {
601 .ctl_name = KERN_PIDMAX,
602 .procname = "pid_max",
603 .data = &pid_max,
604 .maxlen = sizeof (int),
605 .mode = 0644,
606 .proc_handler = &proc_dointvec_minmax,
607 .strategy = sysctl_intvec,
608 .extra1 = &pid_max_min,
609 .extra2 = &pid_max_max,
610 },
611 {
612 .ctl_name = KERN_PANIC_ON_OOPS,
613 .procname = "panic_on_oops",
614 .data = &panic_on_oops,
615 .maxlen = sizeof(int),
616 .mode = 0644,
617 .proc_handler = &proc_dointvec,
618 },
619 {
620 .ctl_name = KERN_PRINTK_RATELIMIT,
621 .procname = "printk_ratelimit",
622 .data = &printk_ratelimit_jiffies,
623 .maxlen = sizeof(int),
624 .mode = 0644,
625 .proc_handler = &proc_dointvec_jiffies,
626 .strategy = &sysctl_jiffies,
627 },
628 {
629 .ctl_name = KERN_PRINTK_RATELIMIT_BURST,
630 .procname = "printk_ratelimit_burst",
631 .data = &printk_ratelimit_burst,
632 .maxlen = sizeof(int),
633 .mode = 0644,
634 .proc_handler = &proc_dointvec,
635 },
636 {
637 .ctl_name = KERN_NGROUPS_MAX,
638 .procname = "ngroups_max",
639 .data = &ngroups_max,
640 .maxlen = sizeof (int),
641 .mode = 0444,
642 .proc_handler = &proc_dointvec,
643 },
644 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
645 {
646 .ctl_name = KERN_UNKNOWN_NMI_PANIC,
647 .procname = "unknown_nmi_panic",
648 .data = &unknown_nmi_panic,
649 .maxlen = sizeof (int),
650 .mode = 0644,
651 .proc_handler = &proc_dointvec,
652 },
653 {
654 .procname = "nmi_watchdog",
655 .data = &nmi_watchdog_enabled,
656 .maxlen = sizeof (int),
657 .mode = 0644,
658 .proc_handler = &proc_nmi_enabled,
659 },
660 #endif
661 #if defined(CONFIG_X86)
662 {
663 .ctl_name = KERN_PANIC_ON_NMI,
664 .procname = "panic_on_unrecovered_nmi",
665 .data = &panic_on_unrecovered_nmi,
666 .maxlen = sizeof(int),
667 .mode = 0644,
668 .proc_handler = &proc_dointvec,
669 },
670 {
671 .ctl_name = KERN_BOOTLOADER_TYPE,
672 .procname = "bootloader_type",
673 .data = &bootloader_type,
674 .maxlen = sizeof (int),
675 .mode = 0444,
676 .proc_handler = &proc_dointvec,
677 },
678 {
679 .ctl_name = CTL_UNNUMBERED,
680 .procname = "kstack_depth_to_print",
681 .data = &kstack_depth_to_print,
682 .maxlen = sizeof(int),
683 .mode = 0644,
684 .proc_handler = &proc_dointvec,
685 },
686 #endif
687 #if defined(CONFIG_MMU)
688 {
689 .ctl_name = KERN_RANDOMIZE,
690 .procname = "randomize_va_space",
691 .data = &randomize_va_space,
692 .maxlen = sizeof(int),
693 .mode = 0644,
694 .proc_handler = &proc_dointvec,
695 },
696 #endif
697 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
698 {
699 .ctl_name = KERN_SPIN_RETRY,
700 .procname = "spin_retry",
701 .data = &spin_retry,
702 .maxlen = sizeof (int),
703 .mode = 0644,
704 .proc_handler = &proc_dointvec,
705 },
706 #endif
707 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
708 {
709 .procname = "acpi_video_flags",
710 .data = &acpi_realmode_flags,
711 .maxlen = sizeof (unsigned long),
712 .mode = 0644,
713 .proc_handler = &proc_doulongvec_minmax,
714 },
715 #endif
716 #ifdef CONFIG_IA64
717 {
718 .ctl_name = KERN_IA64_UNALIGNED,
719 .procname = "ignore-unaligned-usertrap",
720 .data = &no_unaligned_warning,
721 .maxlen = sizeof (int),
722 .mode = 0644,
723 .proc_handler = &proc_dointvec,
724 },
725 #endif
726 #ifdef CONFIG_DETECT_SOFTLOCKUP
727 {
728 .ctl_name = CTL_UNNUMBERED,
729 .procname = "softlockup_thresh",
730 .data = &softlockup_thresh,
731 .maxlen = sizeof(int),
732 .mode = 0644,
733 .proc_handler = &proc_dointvec_minmax,
734 .strategy = &sysctl_intvec,
735 .extra1 = &one,
736 .extra2 = &sixty,
737 },
738 #endif
739 #ifdef CONFIG_COMPAT
740 {
741 .ctl_name = KERN_COMPAT_LOG,
742 .procname = "compat-log",
743 .data = &compat_log,
744 .maxlen = sizeof (int),
745 .mode = 0644,
746 .proc_handler = &proc_dointvec,
747 },
748 #endif
749 #ifdef CONFIG_RT_MUTEXES
750 {
751 .ctl_name = KERN_MAX_LOCK_DEPTH,
752 .procname = "max_lock_depth",
753 .data = &max_lock_depth,
754 .maxlen = sizeof(int),
755 .mode = 0644,
756 .proc_handler = &proc_dointvec,
757 },
758 #endif
759 #ifdef CONFIG_PROC_FS
760 {
761 .ctl_name = CTL_UNNUMBERED,
762 .procname = "maps_protect",
763 .data = &maps_protect,
764 .maxlen = sizeof(int),
765 .mode = 0644,
766 .proc_handler = &proc_dointvec,
767 },
768 #endif
769 {
770 .ctl_name = CTL_UNNUMBERED,
771 .procname = "poweroff_cmd",
772 .data = &poweroff_cmd,
773 .maxlen = POWEROFF_CMD_PATH_LEN,
774 .mode = 0644,
775 .proc_handler = &proc_dostring,
776 .strategy = &sysctl_string,
777 },
778 /*
779 * NOTE: do not add new entries to this table unless you have read
780 * Documentation/sysctl/ctl_unnumbered.txt
781 */
782 { .ctl_name = 0 }
783 };
784
785 static struct ctl_table vm_table[] = {
786 {
787 .ctl_name = VM_OVERCOMMIT_MEMORY,
788 .procname = "overcommit_memory",
789 .data = &sysctl_overcommit_memory,
790 .maxlen = sizeof(sysctl_overcommit_memory),
791 .mode = 0644,
792 .proc_handler = &proc_dointvec,
793 },
794 {
795 .ctl_name = VM_PANIC_ON_OOM,
796 .procname = "panic_on_oom",
797 .data = &sysctl_panic_on_oom,
798 .maxlen = sizeof(sysctl_panic_on_oom),
799 .mode = 0644,
800 .proc_handler = &proc_dointvec,
801 },
802 {
803 .ctl_name = CTL_UNNUMBERED,
804 .procname = "oom_kill_allocating_task",
805 .data = &sysctl_oom_kill_allocating_task,
806 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
807 .mode = 0644,
808 .proc_handler = &proc_dointvec,
809 },
810 {
811 .ctl_name = VM_OVERCOMMIT_RATIO,
812 .procname = "overcommit_ratio",
813 .data = &sysctl_overcommit_ratio,
814 .maxlen = sizeof(sysctl_overcommit_ratio),
815 .mode = 0644,
816 .proc_handler = &proc_dointvec,
817 },
818 {
819 .ctl_name = VM_PAGE_CLUSTER,
820 .procname = "page-cluster",
821 .data = &page_cluster,
822 .maxlen = sizeof(int),
823 .mode = 0644,
824 .proc_handler = &proc_dointvec,
825 },
826 {
827 .ctl_name = VM_DIRTY_BACKGROUND,
828 .procname = "dirty_background_ratio",
829 .data = &dirty_background_ratio,
830 .maxlen = sizeof(dirty_background_ratio),
831 .mode = 0644,
832 .proc_handler = &proc_dointvec_minmax,
833 .strategy = &sysctl_intvec,
834 .extra1 = &zero,
835 .extra2 = &one_hundred,
836 },
837 {
838 .ctl_name = VM_DIRTY_RATIO,
839 .procname = "dirty_ratio",
840 .data = &vm_dirty_ratio,
841 .maxlen = sizeof(vm_dirty_ratio),
842 .mode = 0644,
843 .proc_handler = &dirty_ratio_handler,
844 .strategy = &sysctl_intvec,
845 .extra1 = &zero,
846 .extra2 = &one_hundred,
847 },
848 {
849 .procname = "dirty_writeback_centisecs",
850 .data = &dirty_writeback_interval,
851 .maxlen = sizeof(dirty_writeback_interval),
852 .mode = 0644,
853 .proc_handler = &dirty_writeback_centisecs_handler,
854 },
855 {
856 .procname = "dirty_expire_centisecs",
857 .data = &dirty_expire_interval,
858 .maxlen = sizeof(dirty_expire_interval),
859 .mode = 0644,
860 .proc_handler = &proc_dointvec_userhz_jiffies,
861 },
862 {
863 .ctl_name = VM_NR_PDFLUSH_THREADS,
864 .procname = "nr_pdflush_threads",
865 .data = &nr_pdflush_threads,
866 .maxlen = sizeof nr_pdflush_threads,
867 .mode = 0444 /* read-only*/,
868 .proc_handler = &proc_dointvec,
869 },
870 {
871 .ctl_name = VM_SWAPPINESS,
872 .procname = "swappiness",
873 .data = &vm_swappiness,
874 .maxlen = sizeof(vm_swappiness),
875 .mode = 0644,
876 .proc_handler = &proc_dointvec_minmax,
877 .strategy = &sysctl_intvec,
878 .extra1 = &zero,
879 .extra2 = &one_hundred,
880 },
881 #ifdef CONFIG_HUGETLB_PAGE
882 {
883 .procname = "nr_hugepages",
884 .data = &max_huge_pages,
885 .maxlen = sizeof(unsigned long),
886 .mode = 0644,
887 .proc_handler = &hugetlb_sysctl_handler,
888 .extra1 = (void *)&hugetlb_zero,
889 .extra2 = (void *)&hugetlb_infinity,
890 },
891 {
892 .ctl_name = VM_HUGETLB_GROUP,
893 .procname = "hugetlb_shm_group",
894 .data = &sysctl_hugetlb_shm_group,
895 .maxlen = sizeof(gid_t),
896 .mode = 0644,
897 .proc_handler = &proc_dointvec,
898 },
899 {
900 .ctl_name = CTL_UNNUMBERED,
901 .procname = "hugepages_treat_as_movable",
902 .data = &hugepages_treat_as_movable,
903 .maxlen = sizeof(int),
904 .mode = 0644,
905 .proc_handler = &hugetlb_treat_movable_handler,
906 },
907 {
908 .ctl_name = CTL_UNNUMBERED,
909 .procname = "hugetlb_dynamic_pool",
910 .data = &hugetlb_dynamic_pool,
911 .maxlen = sizeof(hugetlb_dynamic_pool),
912 .mode = 0644,
913 .proc_handler = &proc_dointvec,
914 },
915 #endif
916 {
917 .ctl_name = VM_LOWMEM_RESERVE_RATIO,
918 .procname = "lowmem_reserve_ratio",
919 .data = &sysctl_lowmem_reserve_ratio,
920 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
921 .mode = 0644,
922 .proc_handler = &lowmem_reserve_ratio_sysctl_handler,
923 .strategy = &sysctl_intvec,
924 },
925 {
926 .ctl_name = VM_DROP_PAGECACHE,
927 .procname = "drop_caches",
928 .data = &sysctl_drop_caches,
929 .maxlen = sizeof(int),
930 .mode = 0644,
931 .proc_handler = drop_caches_sysctl_handler,
932 .strategy = &sysctl_intvec,
933 },
934 {
935 .ctl_name = VM_MIN_FREE_KBYTES,
936 .procname = "min_free_kbytes",
937 .data = &min_free_kbytes,
938 .maxlen = sizeof(min_free_kbytes),
939 .mode = 0644,
940 .proc_handler = &min_free_kbytes_sysctl_handler,
941 .strategy = &sysctl_intvec,
942 .extra1 = &zero,
943 },
944 {
945 .ctl_name = VM_PERCPU_PAGELIST_FRACTION,
946 .procname = "percpu_pagelist_fraction",
947 .data = &percpu_pagelist_fraction,
948 .maxlen = sizeof(percpu_pagelist_fraction),
949 .mode = 0644,
950 .proc_handler = &percpu_pagelist_fraction_sysctl_handler,
951 .strategy = &sysctl_intvec,
952 .extra1 = &min_percpu_pagelist_fract,
953 },
954 #ifdef CONFIG_MMU
955 {
956 .ctl_name = VM_MAX_MAP_COUNT,
957 .procname = "max_map_count",
958 .data = &sysctl_max_map_count,
959 .maxlen = sizeof(sysctl_max_map_count),
960 .mode = 0644,
961 .proc_handler = &proc_dointvec
962 },
963 #endif
964 {
965 .ctl_name = VM_LAPTOP_MODE,
966 .procname = "laptop_mode",
967 .data = &laptop_mode,
968 .maxlen = sizeof(laptop_mode),
969 .mode = 0644,
970 .proc_handler = &proc_dointvec_jiffies,
971 .strategy = &sysctl_jiffies,
972 },
973 {
974 .ctl_name = VM_BLOCK_DUMP,
975 .procname = "block_dump",
976 .data = &block_dump,
977 .maxlen = sizeof(block_dump),
978 .mode = 0644,
979 .proc_handler = &proc_dointvec,
980 .strategy = &sysctl_intvec,
981 .extra1 = &zero,
982 },
983 {
984 .ctl_name = VM_VFS_CACHE_PRESSURE,
985 .procname = "vfs_cache_pressure",
986 .data = &sysctl_vfs_cache_pressure,
987 .maxlen = sizeof(sysctl_vfs_cache_pressure),
988 .mode = 0644,
989 .proc_handler = &proc_dointvec,
990 .strategy = &sysctl_intvec,
991 .extra1 = &zero,
992 },
993 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
994 {
995 .ctl_name = VM_LEGACY_VA_LAYOUT,
996 .procname = "legacy_va_layout",
997 .data = &sysctl_legacy_va_layout,
998 .maxlen = sizeof(sysctl_legacy_va_layout),
999 .mode = 0644,
1000 .proc_handler = &proc_dointvec,
1001 .strategy = &sysctl_intvec,
1002 .extra1 = &zero,
1003 },
1004 #endif
1005 #ifdef CONFIG_NUMA
1006 {
1007 .ctl_name = VM_ZONE_RECLAIM_MODE,
1008 .procname = "zone_reclaim_mode",
1009 .data = &zone_reclaim_mode,
1010 .maxlen = sizeof(zone_reclaim_mode),
1011 .mode = 0644,
1012 .proc_handler = &proc_dointvec,
1013 .strategy = &sysctl_intvec,
1014 .extra1 = &zero,
1015 },
1016 {
1017 .ctl_name = VM_MIN_UNMAPPED,
1018 .procname = "min_unmapped_ratio",
1019 .data = &sysctl_min_unmapped_ratio,
1020 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1021 .mode = 0644,
1022 .proc_handler = &sysctl_min_unmapped_ratio_sysctl_handler,
1023 .strategy = &sysctl_intvec,
1024 .extra1 = &zero,
1025 .extra2 = &one_hundred,
1026 },
1027 {
1028 .ctl_name = VM_MIN_SLAB,
1029 .procname = "min_slab_ratio",
1030 .data = &sysctl_min_slab_ratio,
1031 .maxlen = sizeof(sysctl_min_slab_ratio),
1032 .mode = 0644,
1033 .proc_handler = &sysctl_min_slab_ratio_sysctl_handler,
1034 .strategy = &sysctl_intvec,
1035 .extra1 = &zero,
1036 .extra2 = &one_hundred,
1037 },
1038 #endif
1039 #ifdef CONFIG_SMP
1040 {
1041 .ctl_name = CTL_UNNUMBERED,
1042 .procname = "stat_interval",
1043 .data = &sysctl_stat_interval,
1044 .maxlen = sizeof(sysctl_stat_interval),
1045 .mode = 0644,
1046 .proc_handler = &proc_dointvec_jiffies,
1047 .strategy = &sysctl_jiffies,
1048 },
1049 #endif
1050 #ifdef CONFIG_SECURITY
1051 {
1052 .ctl_name = CTL_UNNUMBERED,
1053 .procname = "mmap_min_addr",
1054 .data = &mmap_min_addr,
1055 .maxlen = sizeof(unsigned long),
1056 .mode = 0644,
1057 .proc_handler = &proc_doulongvec_minmax,
1058 },
1059 #endif
1060 #ifdef CONFIG_NUMA
1061 {
1062 .ctl_name = CTL_UNNUMBERED,
1063 .procname = "numa_zonelist_order",
1064 .data = &numa_zonelist_order,
1065 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1066 .mode = 0644,
1067 .proc_handler = &numa_zonelist_order_handler,
1068 .strategy = &sysctl_string,
1069 },
1070 #endif
1071 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1072 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1073 {
1074 .ctl_name = VM_VDSO_ENABLED,
1075 .procname = "vdso_enabled",
1076 .data = &vdso_enabled,
1077 .maxlen = sizeof(vdso_enabled),
1078 .mode = 0644,
1079 .proc_handler = &proc_dointvec,
1080 .strategy = &sysctl_intvec,
1081 .extra1 = &zero,
1082 },
1083 #endif
1084 /*
1085 * NOTE: do not add new entries to this table unless you have read
1086 * Documentation/sysctl/ctl_unnumbered.txt
1087 */
1088 { .ctl_name = 0 }
1089 };
1090
1091 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1092 static struct ctl_table binfmt_misc_table[] = {
1093 { .ctl_name = 0 }
1094 };
1095 #endif
1096
1097 static struct ctl_table fs_table[] = {
1098 {
1099 .ctl_name = FS_NRINODE,
1100 .procname = "inode-nr",
1101 .data = &inodes_stat,
1102 .maxlen = 2*sizeof(int),
1103 .mode = 0444,
1104 .proc_handler = &proc_dointvec,
1105 },
1106 {
1107 .ctl_name = FS_STATINODE,
1108 .procname = "inode-state",
1109 .data = &inodes_stat,
1110 .maxlen = 7*sizeof(int),
1111 .mode = 0444,
1112 .proc_handler = &proc_dointvec,
1113 },
1114 {
1115 .procname = "file-nr",
1116 .data = &files_stat,
1117 .maxlen = 3*sizeof(int),
1118 .mode = 0444,
1119 .proc_handler = &proc_nr_files,
1120 },
1121 {
1122 .ctl_name = FS_MAXFILE,
1123 .procname = "file-max",
1124 .data = &files_stat.max_files,
1125 .maxlen = sizeof(int),
1126 .mode = 0644,
1127 .proc_handler = &proc_dointvec,
1128 },
1129 {
1130 .ctl_name = FS_DENTRY,
1131 .procname = "dentry-state",
1132 .data = &dentry_stat,
1133 .maxlen = 6*sizeof(int),
1134 .mode = 0444,
1135 .proc_handler = &proc_dointvec,
1136 },
1137 {
1138 .ctl_name = FS_OVERFLOWUID,
1139 .procname = "overflowuid",
1140 .data = &fs_overflowuid,
1141 .maxlen = sizeof(int),
1142 .mode = 0644,
1143 .proc_handler = &proc_dointvec_minmax,
1144 .strategy = &sysctl_intvec,
1145 .extra1 = &minolduid,
1146 .extra2 = &maxolduid,
1147 },
1148 {
1149 .ctl_name = FS_OVERFLOWGID,
1150 .procname = "overflowgid",
1151 .data = &fs_overflowgid,
1152 .maxlen = sizeof(int),
1153 .mode = 0644,
1154 .proc_handler = &proc_dointvec_minmax,
1155 .strategy = &sysctl_intvec,
1156 .extra1 = &minolduid,
1157 .extra2 = &maxolduid,
1158 },
1159 {
1160 .ctl_name = FS_LEASES,
1161 .procname = "leases-enable",
1162 .data = &leases_enable,
1163 .maxlen = sizeof(int),
1164 .mode = 0644,
1165 .proc_handler = &proc_dointvec,
1166 },
1167 #ifdef CONFIG_DNOTIFY
1168 {
1169 .ctl_name = FS_DIR_NOTIFY,
1170 .procname = "dir-notify-enable",
1171 .data = &dir_notify_enable,
1172 .maxlen = sizeof(int),
1173 .mode = 0644,
1174 .proc_handler = &proc_dointvec,
1175 },
1176 #endif
1177 #ifdef CONFIG_MMU
1178 {
1179 .ctl_name = FS_LEASE_TIME,
1180 .procname = "lease-break-time",
1181 .data = &lease_break_time,
1182 .maxlen = sizeof(int),
1183 .mode = 0644,
1184 .proc_handler = &proc_dointvec_minmax,
1185 .strategy = &sysctl_intvec,
1186 .extra1 = &zero,
1187 .extra2 = &two,
1188 },
1189 {
1190 .procname = "aio-nr",
1191 .data = &aio_nr,
1192 .maxlen = sizeof(aio_nr),
1193 .mode = 0444,
1194 .proc_handler = &proc_doulongvec_minmax,
1195 },
1196 {
1197 .procname = "aio-max-nr",
1198 .data = &aio_max_nr,
1199 .maxlen = sizeof(aio_max_nr),
1200 .mode = 0644,
1201 .proc_handler = &proc_doulongvec_minmax,
1202 },
1203 #ifdef CONFIG_INOTIFY_USER
1204 {
1205 .ctl_name = FS_INOTIFY,
1206 .procname = "inotify",
1207 .mode = 0555,
1208 .child = inotify_table,
1209 },
1210 #endif
1211 #endif
1212 {
1213 .ctl_name = KERN_SETUID_DUMPABLE,
1214 .procname = "suid_dumpable",
1215 .data = &suid_dumpable,
1216 .maxlen = sizeof(int),
1217 .mode = 0644,
1218 .proc_handler = &proc_dointvec,
1219 },
1220 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1221 {
1222 .ctl_name = CTL_UNNUMBERED,
1223 .procname = "binfmt_misc",
1224 .mode = 0555,
1225 .child = binfmt_misc_table,
1226 },
1227 #endif
1228 /*
1229 * NOTE: do not add new entries to this table unless you have read
1230 * Documentation/sysctl/ctl_unnumbered.txt
1231 */
1232 { .ctl_name = 0 }
1233 };
1234
1235 static struct ctl_table debug_table[] = {
1236 #if defined(CONFIG_X86) || defined(CONFIG_PPC)
1237 {
1238 .ctl_name = CTL_UNNUMBERED,
1239 .procname = "exception-trace",
1240 .data = &show_unhandled_signals,
1241 .maxlen = sizeof(int),
1242 .mode = 0644,
1243 .proc_handler = proc_dointvec
1244 },
1245 #endif
1246 { .ctl_name = 0 }
1247 };
1248
1249 static struct ctl_table dev_table[] = {
1250 { .ctl_name = 0 }
1251 };
1252
1253 static DEFINE_SPINLOCK(sysctl_lock);
1254
1255 /* called under sysctl_lock */
1256 static int use_table(struct ctl_table_header *p)
1257 {
1258 if (unlikely(p->unregistering))
1259 return 0;
1260 p->used++;
1261 return 1;
1262 }
1263
1264 /* called under sysctl_lock */
1265 static void unuse_table(struct ctl_table_header *p)
1266 {
1267 if (!--p->used)
1268 if (unlikely(p->unregistering))
1269 complete(p->unregistering);
1270 }
1271
1272 /* called under sysctl_lock, will reacquire if has to wait */
1273 static void start_unregistering(struct ctl_table_header *p)
1274 {
1275 /*
1276 * if p->used is 0, nobody will ever touch that entry again;
1277 * we'll eliminate all paths to it before dropping sysctl_lock
1278 */
1279 if (unlikely(p->used)) {
1280 struct completion wait;
1281 init_completion(&wait);
1282 p->unregistering = &wait;
1283 spin_unlock(&sysctl_lock);
1284 wait_for_completion(&wait);
1285 spin_lock(&sysctl_lock);
1286 }
1287 /*
1288 * do not remove from the list until nobody holds it; walking the
1289 * list in do_sysctl() relies on that.
1290 */
1291 list_del_init(&p->ctl_entry);
1292 }
1293
1294 void sysctl_head_finish(struct ctl_table_header *head)
1295 {
1296 if (!head)
1297 return;
1298 spin_lock(&sysctl_lock);
1299 unuse_table(head);
1300 spin_unlock(&sysctl_lock);
1301 }
1302
1303 struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev)
1304 {
1305 struct ctl_table_header *head;
1306 struct list_head *tmp;
1307 spin_lock(&sysctl_lock);
1308 if (prev) {
1309 tmp = &prev->ctl_entry;
1310 unuse_table(prev);
1311 goto next;
1312 }
1313 tmp = &root_table_header.ctl_entry;
1314 for (;;) {
1315 head = list_entry(tmp, struct ctl_table_header, ctl_entry);
1316
1317 if (!use_table(head))
1318 goto next;
1319 spin_unlock(&sysctl_lock);
1320 return head;
1321 next:
1322 tmp = tmp->next;
1323 if (tmp == &root_table_header.ctl_entry)
1324 break;
1325 }
1326 spin_unlock(&sysctl_lock);
1327 return NULL;
1328 }
1329
1330 #ifdef CONFIG_SYSCTL_SYSCALL
1331 int do_sysctl(int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp,
1332 void __user *newval, size_t newlen)
1333 {
1334 struct ctl_table_header *head;
1335 int error = -ENOTDIR;
1336
1337 if (nlen <= 0 || nlen >= CTL_MAXNAME)
1338 return -ENOTDIR;
1339 if (oldval) {
1340 int old_len;
1341 if (!oldlenp || get_user(old_len, oldlenp))
1342 return -EFAULT;
1343 }
1344
1345 for (head = sysctl_head_next(NULL); head;
1346 head = sysctl_head_next(head)) {
1347 error = parse_table(name, nlen, oldval, oldlenp,
1348 newval, newlen, head->ctl_table);
1349 if (error != -ENOTDIR) {
1350 sysctl_head_finish(head);
1351 break;
1352 }
1353 }
1354 return error;
1355 }
1356
1357 asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
1358 {
1359 struct __sysctl_args tmp;
1360 int error;
1361
1362 if (copy_from_user(&tmp, args, sizeof(tmp)))
1363 return -EFAULT;
1364
1365 error = deprecated_sysctl_warning(&tmp);
1366 if (error)
1367 goto out;
1368
1369 lock_kernel();
1370 error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp,
1371 tmp.newval, tmp.newlen);
1372 unlock_kernel();
1373 out:
1374 return error;
1375 }
1376 #endif /* CONFIG_SYSCTL_SYSCALL */
1377
1378 /*
1379 * sysctl_perm does NOT grant the superuser all rights automatically, because
1380 * some sysctl variables are readonly even to root.
1381 */
1382
1383 static int test_perm(int mode, int op)
1384 {
1385 if (!current->euid)
1386 mode >>= 6;
1387 else if (in_egroup_p(0))
1388 mode >>= 3;
1389 if ((mode & op & 0007) == op)
1390 return 0;
1391 return -EACCES;
1392 }
1393
1394 int sysctl_perm(struct ctl_table *table, int op)
1395 {
1396 int error;
1397 error = security_sysctl(table, op);
1398 if (error)
1399 return error;
1400 return test_perm(table->mode, op);
1401 }
1402
1403 #ifdef CONFIG_SYSCTL_SYSCALL
1404 static int parse_table(int __user *name, int nlen,
1405 void __user *oldval, size_t __user *oldlenp,
1406 void __user *newval, size_t newlen,
1407 struct ctl_table *table)
1408 {
1409 int n;
1410 repeat:
1411 if (!nlen)
1412 return -ENOTDIR;
1413 if (get_user(n, name))
1414 return -EFAULT;
1415 for ( ; table->ctl_name || table->procname; table++) {
1416 if (!table->ctl_name)
1417 continue;
1418 if (n == table->ctl_name) {
1419 int error;
1420 if (table->child) {
1421 if (sysctl_perm(table, 001))
1422 return -EPERM;
1423 name++;
1424 nlen--;
1425 table = table->child;
1426 goto repeat;
1427 }
1428 error = do_sysctl_strategy(table, name, nlen,
1429 oldval, oldlenp,
1430 newval, newlen);
1431 return error;
1432 }
1433 }
1434 return -ENOTDIR;
1435 }
1436
1437 /* Perform the actual read/write of a sysctl table entry. */
1438 int do_sysctl_strategy (struct ctl_table *table,
1439 int __user *name, int nlen,
1440 void __user *oldval, size_t __user *oldlenp,
1441 void __user *newval, size_t newlen)
1442 {
1443 int op = 0, rc;
1444
1445 if (oldval)
1446 op |= 004;
1447 if (newval)
1448 op |= 002;
1449 if (sysctl_perm(table, op))
1450 return -EPERM;
1451
1452 if (table->strategy) {
1453 rc = table->strategy(table, name, nlen, oldval, oldlenp,
1454 newval, newlen);
1455 if (rc < 0)
1456 return rc;
1457 if (rc > 0)
1458 return 0;
1459 }
1460
1461 /* If there is no strategy routine, or if the strategy returns
1462 * zero, proceed with automatic r/w */
1463 if (table->data && table->maxlen) {
1464 rc = sysctl_data(table, name, nlen, oldval, oldlenp,
1465 newval, newlen);
1466 if (rc < 0)
1467 return rc;
1468 }
1469 return 0;
1470 }
1471 #endif /* CONFIG_SYSCTL_SYSCALL */
1472
1473 static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table)
1474 {
1475 for (; table->ctl_name || table->procname; table++) {
1476 table->parent = parent;
1477 if (table->child)
1478 sysctl_set_parent(table, table->child);
1479 }
1480 }
1481
1482 static __init int sysctl_init(void)
1483 {
1484 int err;
1485 sysctl_set_parent(NULL, root_table);
1486 err = sysctl_check_table(root_table);
1487 return 0;
1488 }
1489
1490 core_initcall(sysctl_init);
1491
1492 /**
1493 * register_sysctl_table - register a sysctl hierarchy
1494 * @table: the top-level table structure
1495 *
1496 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1497 * array. An entry with a ctl_name of 0 terminates the table.
1498 *
1499 * The members of the &struct ctl_table structure are used as follows:
1500 *
1501 * ctl_name - This is the numeric sysctl value used by sysctl(2). The number
1502 * must be unique within that level of sysctl
1503 *
1504 * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1505 * enter a sysctl file
1506 *
1507 * data - a pointer to data for use by proc_handler
1508 *
1509 * maxlen - the maximum size in bytes of the data
1510 *
1511 * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1512 *
1513 * child - a pointer to the child sysctl table if this entry is a directory, or
1514 * %NULL.
1515 *
1516 * proc_handler - the text handler routine (described below)
1517 *
1518 * strategy - the strategy routine (described below)
1519 *
1520 * de - for internal use by the sysctl routines
1521 *
1522 * extra1, extra2 - extra pointers usable by the proc handler routines
1523 *
1524 * Leaf nodes in the sysctl tree will be represented by a single file
1525 * under /proc; non-leaf nodes will be represented by directories.
1526 *
1527 * sysctl(2) can automatically manage read and write requests through
1528 * the sysctl table. The data and maxlen fields of the ctl_table
1529 * struct enable minimal validation of the values being written to be
1530 * performed, and the mode field allows minimal authentication.
1531 *
1532 * More sophisticated management can be enabled by the provision of a
1533 * strategy routine with the table entry. This will be called before
1534 * any automatic read or write of the data is performed.
1535 *
1536 * The strategy routine may return
1537 *
1538 * < 0 - Error occurred (error is passed to user process)
1539 *
1540 * 0 - OK - proceed with automatic read or write.
1541 *
1542 * > 0 - OK - read or write has been done by the strategy routine, so
1543 * return immediately.
1544 *
1545 * There must be a proc_handler routine for any terminal nodes
1546 * mirrored under /proc/sys (non-terminals are handled by a built-in
1547 * directory handler). Several default handlers are available to
1548 * cover common cases -
1549 *
1550 * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
1551 * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(),
1552 * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
1553 *
1554 * It is the handler's job to read the input buffer from user memory
1555 * and process it. The handler should return 0 on success.
1556 *
1557 * This routine returns %NULL on a failure to register, and a pointer
1558 * to the table header on success.
1559 */
1560 struct ctl_table_header *register_sysctl_table(struct ctl_table * table)
1561 {
1562 struct ctl_table_header *tmp;
1563 tmp = kmalloc(sizeof(struct ctl_table_header), GFP_KERNEL);
1564 if (!tmp)
1565 return NULL;
1566 tmp->ctl_table = table;
1567 INIT_LIST_HEAD(&tmp->ctl_entry);
1568 tmp->used = 0;
1569 tmp->unregistering = NULL;
1570 sysctl_set_parent(NULL, table);
1571 if (sysctl_check_table(tmp->ctl_table)) {
1572 kfree(tmp);
1573 return NULL;
1574 }
1575 spin_lock(&sysctl_lock);
1576 list_add_tail(&tmp->ctl_entry, &root_table_header.ctl_entry);
1577 spin_unlock(&sysctl_lock);
1578 return tmp;
1579 }
1580
1581 /**
1582 * unregister_sysctl_table - unregister a sysctl table hierarchy
1583 * @header: the header returned from register_sysctl_table
1584 *
1585 * Unregisters the sysctl table and all children. proc entries may not
1586 * actually be removed until they are no longer used by anyone.
1587 */
1588 void unregister_sysctl_table(struct ctl_table_header * header)
1589 {
1590 might_sleep();
1591
1592 if (header == NULL)
1593 return;
1594
1595 spin_lock(&sysctl_lock);
1596 start_unregistering(header);
1597 spin_unlock(&sysctl_lock);
1598 kfree(header);
1599 }
1600
1601 #else /* !CONFIG_SYSCTL */
1602 struct ctl_table_header *register_sysctl_table(struct ctl_table * table)
1603 {
1604 return NULL;
1605 }
1606
1607 void unregister_sysctl_table(struct ctl_table_header * table)
1608 {
1609 }
1610
1611 #endif /* CONFIG_SYSCTL */
1612
1613 /*
1614 * /proc/sys support
1615 */
1616
1617 #ifdef CONFIG_PROC_SYSCTL
1618
1619 static int _proc_do_string(void* data, int maxlen, int write,
1620 struct file *filp, void __user *buffer,
1621 size_t *lenp, loff_t *ppos)
1622 {
1623 size_t len;
1624 char __user *p;
1625 char c;
1626
1627 if (!data || !maxlen || !*lenp) {
1628 *lenp = 0;
1629 return 0;
1630 }
1631
1632 if (write) {
1633 len = 0;
1634 p = buffer;
1635 while (len < *lenp) {
1636 if (get_user(c, p++))
1637 return -EFAULT;
1638 if (c == 0 || c == '\n')
1639 break;
1640 len++;
1641 }
1642 if (len >= maxlen)
1643 len = maxlen-1;
1644 if(copy_from_user(data, buffer, len))
1645 return -EFAULT;
1646 ((char *) data)[len] = 0;
1647 *ppos += *lenp;
1648 } else {
1649 len = strlen(data);
1650 if (len > maxlen)
1651 len = maxlen;
1652
1653 if (*ppos > len) {
1654 *lenp = 0;
1655 return 0;
1656 }
1657
1658 data += *ppos;
1659 len -= *ppos;
1660
1661 if (len > *lenp)
1662 len = *lenp;
1663 if (len)
1664 if(copy_to_user(buffer, data, len))
1665 return -EFAULT;
1666 if (len < *lenp) {
1667 if(put_user('\n', ((char __user *) buffer) + len))
1668 return -EFAULT;
1669 len++;
1670 }
1671 *lenp = len;
1672 *ppos += len;
1673 }
1674 return 0;
1675 }
1676
1677 /**
1678 * proc_dostring - read a string sysctl
1679 * @table: the sysctl table
1680 * @write: %TRUE if this is a write to the sysctl file
1681 * @filp: the file structure
1682 * @buffer: the user buffer
1683 * @lenp: the size of the user buffer
1684 * @ppos: file position
1685 *
1686 * Reads/writes a string from/to the user buffer. If the kernel
1687 * buffer provided is not large enough to hold the string, the
1688 * string is truncated. The copied string is %NULL-terminated.
1689 * If the string is being read by the user process, it is copied
1690 * and a newline '\n' is added. It is truncated if the buffer is
1691 * not large enough.
1692 *
1693 * Returns 0 on success.
1694 */
1695 int proc_dostring(struct ctl_table *table, int write, struct file *filp,
1696 void __user *buffer, size_t *lenp, loff_t *ppos)
1697 {
1698 return _proc_do_string(table->data, table->maxlen, write, filp,
1699 buffer, lenp, ppos);
1700 }
1701
1702
1703 static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp,
1704 int *valp,
1705 int write, void *data)
1706 {
1707 if (write) {
1708 *valp = *negp ? -*lvalp : *lvalp;
1709 } else {
1710 int val = *valp;
1711 if (val < 0) {
1712 *negp = -1;
1713 *lvalp = (unsigned long)-val;
1714 } else {
1715 *negp = 0;
1716 *lvalp = (unsigned long)val;
1717 }
1718 }
1719 return 0;
1720 }
1721
1722 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
1723 int write, struct file *filp, void __user *buffer,
1724 size_t *lenp, loff_t *ppos,
1725 int (*conv)(int *negp, unsigned long *lvalp, int *valp,
1726 int write, void *data),
1727 void *data)
1728 {
1729 #define TMPBUFLEN 21
1730 int *i, vleft, first=1, neg, val;
1731 unsigned long lval;
1732 size_t left, len;
1733
1734 char buf[TMPBUFLEN], *p;
1735 char __user *s = buffer;
1736
1737 if (!tbl_data || !table->maxlen || !*lenp ||
1738 (*ppos && !write)) {
1739 *lenp = 0;
1740 return 0;
1741 }
1742
1743 i = (int *) tbl_data;
1744 vleft = table->maxlen / sizeof(*i);
1745 left = *lenp;
1746
1747 if (!conv)
1748 conv = do_proc_dointvec_conv;
1749
1750 for (; left && vleft--; i++, first=0) {
1751 if (write) {
1752 while (left) {
1753 char c;
1754 if (get_user(c, s))
1755 return -EFAULT;
1756 if (!isspace(c))
1757 break;
1758 left--;
1759 s++;
1760 }
1761 if (!left)
1762 break;
1763 neg = 0;
1764 len = left;
1765 if (len > sizeof(buf) - 1)
1766 len = sizeof(buf) - 1;
1767 if (copy_from_user(buf, s, len))
1768 return -EFAULT;
1769 buf[len] = 0;
1770 p = buf;
1771 if (*p == '-' && left > 1) {
1772 neg = 1;
1773 p++;
1774 }
1775 if (*p < '0' || *p > '9')
1776 break;
1777
1778 lval = simple_strtoul(p, &p, 0);
1779
1780 len = p-buf;
1781 if ((len < left) && *p && !isspace(*p))
1782 break;
1783 if (neg)
1784 val = -val;
1785 s += len;
1786 left -= len;
1787
1788 if (conv(&neg, &lval, i, 1, data))
1789 break;
1790 } else {
1791 p = buf;
1792 if (!first)
1793 *p++ = '\t';
1794
1795 if (conv(&neg, &lval, i, 0, data))
1796 break;
1797
1798 sprintf(p, "%s%lu", neg ? "-" : "", lval);
1799 len = strlen(buf);
1800 if (len > left)
1801 len = left;
1802 if(copy_to_user(s, buf, len))
1803 return -EFAULT;
1804 left -= len;
1805 s += len;
1806 }
1807 }
1808
1809 if (!write && !first && left) {
1810 if(put_user('\n', s))
1811 return -EFAULT;
1812 left--, s++;
1813 }
1814 if (write) {
1815 while (left) {
1816 char c;
1817 if (get_user(c, s++))
1818 return -EFAULT;
1819 if (!isspace(c))
1820 break;
1821 left--;
1822 }
1823 }
1824 if (write && first)
1825 return -EINVAL;
1826 *lenp -= left;
1827 *ppos += *lenp;
1828 return 0;
1829 #undef TMPBUFLEN
1830 }
1831
1832 static int do_proc_dointvec(struct ctl_table *table, int write, struct file *filp,
1833 void __user *buffer, size_t *lenp, loff_t *ppos,
1834 int (*conv)(int *negp, unsigned long *lvalp, int *valp,
1835 int write, void *data),
1836 void *data)
1837 {
1838 return __do_proc_dointvec(table->data, table, write, filp,
1839 buffer, lenp, ppos, conv, data);
1840 }
1841
1842 /**
1843 * proc_dointvec - read a vector of integers
1844 * @table: the sysctl table
1845 * @write: %TRUE if this is a write to the sysctl file
1846 * @filp: the file structure
1847 * @buffer: the user buffer
1848 * @lenp: the size of the user buffer
1849 * @ppos: file position
1850 *
1851 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1852 * values from/to the user buffer, treated as an ASCII string.
1853 *
1854 * Returns 0 on success.
1855 */
1856 int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
1857 void __user *buffer, size_t *lenp, loff_t *ppos)
1858 {
1859 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
1860 NULL,NULL);
1861 }
1862
1863 #define OP_SET 0
1864 #define OP_AND 1
1865 #define OP_OR 2
1866
1867 static int do_proc_dointvec_bset_conv(int *negp, unsigned long *lvalp,
1868 int *valp,
1869 int write, void *data)
1870 {
1871 int op = *(int *)data;
1872 if (write) {
1873 int val = *negp ? -*lvalp : *lvalp;
1874 switch(op) {
1875 case OP_SET: *valp = val; break;
1876 case OP_AND: *valp &= val; break;
1877 case OP_OR: *valp |= val; break;
1878 }
1879 } else {
1880 int val = *valp;
1881 if (val < 0) {
1882 *negp = -1;
1883 *lvalp = (unsigned long)-val;
1884 } else {
1885 *negp = 0;
1886 *lvalp = (unsigned long)val;
1887 }
1888 }
1889 return 0;
1890 }
1891
1892 #ifdef CONFIG_SECURITY_CAPABILITIES
1893 /*
1894 * init may raise the set.
1895 */
1896
1897 int proc_dointvec_bset(struct ctl_table *table, int write, struct file *filp,
1898 void __user *buffer, size_t *lenp, loff_t *ppos)
1899 {
1900 int op;
1901
1902 if (write && !capable(CAP_SYS_MODULE)) {
1903 return -EPERM;
1904 }
1905
1906 op = is_global_init(current) ? OP_SET : OP_AND;
1907 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
1908 do_proc_dointvec_bset_conv,&op);
1909 }
1910 #endif /* def CONFIG_SECURITY_CAPABILITIES */
1911
1912 /*
1913 * Taint values can only be increased
1914 */
1915 static int proc_dointvec_taint(struct ctl_table *table, int write, struct file *filp,
1916 void __user *buffer, size_t *lenp, loff_t *ppos)
1917 {
1918 int op;
1919
1920 if (write && !capable(CAP_SYS_ADMIN))
1921 return -EPERM;
1922
1923 op = OP_OR;
1924 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
1925 do_proc_dointvec_bset_conv,&op);
1926 }
1927
1928 struct do_proc_dointvec_minmax_conv_param {
1929 int *min;
1930 int *max;
1931 };
1932
1933 static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp,
1934 int *valp,
1935 int write, void *data)
1936 {
1937 struct do_proc_dointvec_minmax_conv_param *param = data;
1938 if (write) {
1939 int val = *negp ? -*lvalp : *lvalp;
1940 if ((param->min && *param->min > val) ||
1941 (param->max && *param->max < val))
1942 return -EINVAL;
1943 *valp = val;
1944 } else {
1945 int val = *valp;
1946 if (val < 0) {
1947 *negp = -1;
1948 *lvalp = (unsigned long)-val;
1949 } else {
1950 *negp = 0;
1951 *lvalp = (unsigned long)val;
1952 }
1953 }
1954 return 0;
1955 }
1956
1957 /**
1958 * proc_dointvec_minmax - read a vector of integers with min/max values
1959 * @table: the sysctl table
1960 * @write: %TRUE if this is a write to the sysctl file
1961 * @filp: the file structure
1962 * @buffer: the user buffer
1963 * @lenp: the size of the user buffer
1964 * @ppos: file position
1965 *
1966 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1967 * values from/to the user buffer, treated as an ASCII string.
1968 *
1969 * This routine will ensure the values are within the range specified by
1970 * table->extra1 (min) and table->extra2 (max).
1971 *
1972 * Returns 0 on success.
1973 */
1974 int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
1975 void __user *buffer, size_t *lenp, loff_t *ppos)
1976 {
1977 struct do_proc_dointvec_minmax_conv_param param = {
1978 .min = (int *) table->extra1,
1979 .max = (int *) table->extra2,
1980 };
1981 return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
1982 do_proc_dointvec_minmax_conv, &param);
1983 }
1984
1985 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
1986 struct file *filp,
1987 void __user *buffer,
1988 size_t *lenp, loff_t *ppos,
1989 unsigned long convmul,
1990 unsigned long convdiv)
1991 {
1992 #define TMPBUFLEN 21
1993 unsigned long *i, *min, *max, val;
1994 int vleft, first=1, neg;
1995 size_t len, left;
1996 char buf[TMPBUFLEN], *p;
1997 char __user *s = buffer;
1998
1999 if (!data || !table->maxlen || !*lenp ||
2000 (*ppos && !write)) {
2001 *lenp = 0;
2002 return 0;
2003 }
2004
2005 i = (unsigned long *) data;
2006 min = (unsigned long *) table->extra1;
2007 max = (unsigned long *) table->extra2;
2008 vleft = table->maxlen / sizeof(unsigned long);
2009 left = *lenp;
2010
2011 for (; left && vleft--; i++, min++, max++, first=0) {
2012 if (write) {
2013 while (left) {
2014 char c;
2015 if (get_user(c, s))
2016 return -EFAULT;
2017 if (!isspace(c))
2018 break;
2019 left--;
2020 s++;
2021 }
2022 if (!left)
2023 break;
2024 neg = 0;
2025 len = left;
2026 if (len > TMPBUFLEN-1)
2027 len = TMPBUFLEN-1;
2028 if (copy_from_user(buf, s, len))
2029 return -EFAULT;
2030 buf[len] = 0;
2031 p = buf;
2032 if (*p == '-' && left > 1) {
2033 neg = 1;
2034 p++;
2035 }
2036 if (*p < '0' || *p > '9')
2037 break;
2038 val = simple_strtoul(p, &p, 0) * convmul / convdiv ;
2039 len = p-buf;
2040 if ((len < left) && *p && !isspace(*p))
2041 break;
2042 if (neg)
2043 val = -val;
2044 s += len;
2045 left -= len;
2046
2047 if(neg)
2048 continue;
2049 if ((min && val < *min) || (max && val > *max))
2050 continue;
2051 *i = val;
2052 } else {
2053 p = buf;
2054 if (!first)
2055 *p++ = '\t';
2056 sprintf(p, "%lu", convdiv * (*i) / convmul);
2057 len = strlen(buf);
2058 if (len > left)
2059 len = left;
2060 if(copy_to_user(s, buf, len))
2061 return -EFAULT;
2062 left -= len;
2063 s += len;
2064 }
2065 }
2066
2067 if (!write && !first && left) {
2068 if(put_user('\n', s))
2069 return -EFAULT;
2070 left--, s++;
2071 }
2072 if (write) {
2073 while (left) {
2074 char c;
2075 if (get_user(c, s++))
2076 return -EFAULT;
2077 if (!isspace(c))
2078 break;
2079 left--;
2080 }
2081 }
2082 if (write && first)
2083 return -EINVAL;
2084 *lenp -= left;
2085 *ppos += *lenp;
2086 return 0;
2087 #undef TMPBUFLEN
2088 }
2089
2090 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2091 struct file *filp,
2092 void __user *buffer,
2093 size_t *lenp, loff_t *ppos,
2094 unsigned long convmul,
2095 unsigned long convdiv)
2096 {
2097 return __do_proc_doulongvec_minmax(table->data, table, write,
2098 filp, buffer, lenp, ppos, convmul, convdiv);
2099 }
2100
2101 /**
2102 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2103 * @table: the sysctl table
2104 * @write: %TRUE if this is a write to the sysctl file
2105 * @filp: the file structure
2106 * @buffer: the user buffer
2107 * @lenp: the size of the user buffer
2108 * @ppos: file position
2109 *
2110 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2111 * values from/to the user buffer, treated as an ASCII string.
2112 *
2113 * This routine will ensure the values are within the range specified by
2114 * table->extra1 (min) and table->extra2 (max).
2115 *
2116 * Returns 0 on success.
2117 */
2118 int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
2119 void __user *buffer, size_t *lenp, loff_t *ppos)
2120 {
2121 return do_proc_doulongvec_minmax(table, write, filp, buffer, lenp, ppos, 1l, 1l);
2122 }
2123
2124 /**
2125 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2126 * @table: the sysctl table
2127 * @write: %TRUE if this is a write to the sysctl file
2128 * @filp: the file structure
2129 * @buffer: the user buffer
2130 * @lenp: the size of the user buffer
2131 * @ppos: file position
2132 *
2133 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2134 * values from/to the user buffer, treated as an ASCII string. The values
2135 * are treated as milliseconds, and converted to jiffies when they are stored.
2136 *
2137 * This routine will ensure the values are within the range specified by
2138 * table->extra1 (min) and table->extra2 (max).
2139 *
2140 * Returns 0 on success.
2141 */
2142 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2143 struct file *filp,
2144 void __user *buffer,
2145 size_t *lenp, loff_t *ppos)
2146 {
2147 return do_proc_doulongvec_minmax(table, write, filp, buffer,
2148 lenp, ppos, HZ, 1000l);
2149 }
2150
2151
2152 static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp,
2153 int *valp,
2154 int write, void *data)
2155 {
2156 if (write) {
2157 if (*lvalp > LONG_MAX / HZ)
2158 return 1;
2159 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2160 } else {
2161 int val = *valp;
2162 unsigned long lval;
2163 if (val < 0) {
2164 *negp = -1;
2165 lval = (unsigned long)-val;
2166 } else {
2167 *negp = 0;
2168 lval = (unsigned long)val;
2169 }
2170 *lvalp = lval / HZ;
2171 }
2172 return 0;
2173 }
2174
2175 static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp,
2176 int *valp,
2177 int write, void *data)
2178 {
2179 if (write) {
2180 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2181 return 1;
2182 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2183 } else {
2184 int val = *valp;
2185 unsigned long lval;
2186 if (val < 0) {
2187 *negp = -1;
2188 lval = (unsigned long)-val;
2189 } else {
2190 *negp = 0;
2191 lval = (unsigned long)val;
2192 }
2193 *lvalp = jiffies_to_clock_t(lval);
2194 }
2195 return 0;
2196 }
2197
2198 static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp,
2199 int *valp,
2200 int write, void *data)
2201 {
2202 if (write) {
2203 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2204 } else {
2205 int val = *valp;
2206 unsigned long lval;
2207 if (val < 0) {
2208 *negp = -1;
2209 lval = (unsigned long)-val;
2210 } else {
2211 *negp = 0;
2212 lval = (unsigned long)val;
2213 }
2214 *lvalp = jiffies_to_msecs(lval);
2215 }
2216 return 0;
2217 }
2218
2219 /**
2220 * proc_dointvec_jiffies - read a vector of integers as seconds
2221 * @table: the sysctl table
2222 * @write: %TRUE if this is a write to the sysctl file
2223 * @filp: the file structure
2224 * @buffer: the user buffer
2225 * @lenp: the size of the user buffer
2226 * @ppos: file position
2227 *
2228 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2229 * values from/to the user buffer, treated as an ASCII string.
2230 * The values read are assumed to be in seconds, and are converted into
2231 * jiffies.
2232 *
2233 * Returns 0 on success.
2234 */
2235 int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
2236 void __user *buffer, size_t *lenp, loff_t *ppos)
2237 {
2238 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2239 do_proc_dointvec_jiffies_conv,NULL);
2240 }
2241
2242 /**
2243 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2244 * @table: the sysctl table
2245 * @write: %TRUE if this is a write to the sysctl file
2246 * @filp: the file structure
2247 * @buffer: the user buffer
2248 * @lenp: the size of the user buffer
2249 * @ppos: pointer to the file position
2250 *
2251 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2252 * values from/to the user buffer, treated as an ASCII string.
2253 * The values read are assumed to be in 1/USER_HZ seconds, and
2254 * are converted into jiffies.
2255 *
2256 * Returns 0 on success.
2257 */
2258 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
2259 void __user *buffer, size_t *lenp, loff_t *ppos)
2260 {
2261 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2262 do_proc_dointvec_userhz_jiffies_conv,NULL);
2263 }
2264
2265 /**
2266 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2267 * @table: the sysctl table
2268 * @write: %TRUE if this is a write to the sysctl file
2269 * @filp: the file structure
2270 * @buffer: the user buffer
2271 * @lenp: the size of the user buffer
2272 * @ppos: file position
2273 * @ppos: the current position in the file
2274 *
2275 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2276 * values from/to the user buffer, treated as an ASCII string.
2277 * The values read are assumed to be in 1/1000 seconds, and
2278 * are converted into jiffies.
2279 *
2280 * Returns 0 on success.
2281 */
2282 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
2283 void __user *buffer, size_t *lenp, loff_t *ppos)
2284 {
2285 return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2286 do_proc_dointvec_ms_jiffies_conv, NULL);
2287 }
2288
2289 static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
2290 void __user *buffer, size_t *lenp, loff_t *ppos)
2291 {
2292 struct pid *new_pid;
2293 pid_t tmp;
2294 int r;
2295
2296 tmp = pid_nr_ns(cad_pid, current->nsproxy->pid_ns);
2297
2298 r = __do_proc_dointvec(&tmp, table, write, filp, buffer,
2299 lenp, ppos, NULL, NULL);
2300 if (r || !write)
2301 return r;
2302
2303 new_pid = find_get_pid(tmp);
2304 if (!new_pid)
2305 return -ESRCH;
2306
2307 put_pid(xchg(&cad_pid, new_pid));
2308 return 0;
2309 }
2310
2311 #else /* CONFIG_PROC_FS */
2312
2313 int proc_dostring(struct ctl_table *table, int write, struct file *filp,
2314 void __user *buffer, size_t *lenp, loff_t *ppos)
2315 {
2316 return -ENOSYS;
2317 }
2318
2319 int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2320 void __user *buffer, size_t *lenp, loff_t *ppos)
2321 {
2322 return -ENOSYS;
2323 }
2324
2325 int proc_dointvec_bset(struct ctl_table *table, int write, struct file *filp,
2326 void __user *buffer, size_t *lenp, loff_t *ppos)
2327 {
2328 return -ENOSYS;
2329 }
2330
2331 int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
2332 void __user *buffer, size_t *lenp, loff_t *ppos)
2333 {
2334 return -ENOSYS;
2335 }
2336
2337 int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
2338 void __user *buffer, size_t *lenp, loff_t *ppos)
2339 {
2340 return -ENOSYS;
2341 }
2342
2343 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
2344 void __user *buffer, size_t *lenp, loff_t *ppos)
2345 {
2346 return -ENOSYS;
2347 }
2348
2349 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
2350 void __user *buffer, size_t *lenp, loff_t *ppos)
2351 {
2352 return -ENOSYS;
2353 }
2354
2355 int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
2356 void __user *buffer, size_t *lenp, loff_t *ppos)
2357 {
2358 return -ENOSYS;
2359 }
2360
2361 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2362 struct file *filp,
2363 void __user *buffer,
2364 size_t *lenp, loff_t *ppos)
2365 {
2366 return -ENOSYS;
2367 }
2368
2369
2370 #endif /* CONFIG_PROC_FS */
2371
2372
2373 #ifdef CONFIG_SYSCTL_SYSCALL
2374 /*
2375 * General sysctl support routines
2376 */
2377
2378 /* The generic sysctl data routine (used if no strategy routine supplied) */
2379 int sysctl_data(struct ctl_table *table, int __user *name, int nlen,
2380 void __user *oldval, size_t __user *oldlenp,
2381 void __user *newval, size_t newlen)
2382 {
2383 size_t len;
2384
2385 /* Get out of I don't have a variable */
2386 if (!table->data || !table->maxlen)
2387 return -ENOTDIR;
2388
2389 if (oldval && oldlenp) {
2390 if (get_user(len, oldlenp))
2391 return -EFAULT;
2392 if (len) {
2393 if (len > table->maxlen)
2394 len = table->maxlen;
2395 if (copy_to_user(oldval, table->data, len))
2396 return -EFAULT;
2397 if (put_user(len, oldlenp))
2398 return -EFAULT;
2399 }
2400 }
2401
2402 if (newval && newlen) {
2403 if (newlen > table->maxlen)
2404 newlen = table->maxlen;
2405
2406 if (copy_from_user(table->data, newval, newlen))
2407 return -EFAULT;
2408 }
2409 return 1;
2410 }
2411
2412 /* The generic string strategy routine: */
2413 int sysctl_string(struct ctl_table *table, int __user *name, int nlen,
2414 void __user *oldval, size_t __user *oldlenp,
2415 void __user *newval, size_t newlen)
2416 {
2417 if (!table->data || !table->maxlen)
2418 return -ENOTDIR;
2419
2420 if (oldval && oldlenp) {
2421 size_t bufsize;
2422 if (get_user(bufsize, oldlenp))
2423 return -EFAULT;
2424 if (bufsize) {
2425 size_t len = strlen(table->data), copied;
2426
2427 /* This shouldn't trigger for a well-formed sysctl */
2428 if (len > table->maxlen)
2429 len = table->maxlen;
2430
2431 /* Copy up to a max of bufsize-1 bytes of the string */
2432 copied = (len >= bufsize) ? bufsize - 1 : len;
2433
2434 if (copy_to_user(oldval, table->data, copied) ||
2435 put_user(0, (char __user *)(oldval + copied)))
2436 return -EFAULT;
2437 if (put_user(len, oldlenp))
2438 return -EFAULT;
2439 }
2440 }
2441 if (newval && newlen) {
2442 size_t len = newlen;
2443 if (len > table->maxlen)
2444 len = table->maxlen;
2445 if(copy_from_user(table->data, newval, len))
2446 return -EFAULT;
2447 if (len == table->maxlen)
2448 len--;
2449 ((char *) table->data)[len] = 0;
2450 }
2451 return 1;
2452 }
2453
2454 /*
2455 * This function makes sure that all of the integers in the vector
2456 * are between the minimum and maximum values given in the arrays
2457 * table->extra1 and table->extra2, respectively.
2458 */
2459 int sysctl_intvec(struct ctl_table *table, int __user *name, int nlen,
2460 void __user *oldval, size_t __user *oldlenp,
2461 void __user *newval, size_t newlen)
2462 {
2463
2464 if (newval && newlen) {
2465 int __user *vec = (int __user *) newval;
2466 int *min = (int *) table->extra1;
2467 int *max = (int *) table->extra2;
2468 size_t length;
2469 int i;
2470
2471 if (newlen % sizeof(int) != 0)
2472 return -EINVAL;
2473
2474 if (!table->extra1 && !table->extra2)
2475 return 0;
2476
2477 if (newlen > table->maxlen)
2478 newlen = table->maxlen;
2479 length = newlen / sizeof(int);
2480
2481 for (i = 0; i < length; i++) {
2482 int value;
2483 if (get_user(value, vec + i))
2484 return -EFAULT;
2485 if (min && value < min[i])
2486 return -EINVAL;
2487 if (max && value > max[i])
2488 return -EINVAL;
2489 }
2490 }
2491 return 0;
2492 }
2493
2494 /* Strategy function to convert jiffies to seconds */
2495 int sysctl_jiffies(struct ctl_table *table, int __user *name, int nlen,
2496 void __user *oldval, size_t __user *oldlenp,
2497 void __user *newval, size_t newlen)
2498 {
2499 if (oldval && oldlenp) {
2500 size_t olen;
2501
2502 if (get_user(olen, oldlenp))
2503 return -EFAULT;
2504 if (olen) {
2505 int val;
2506
2507 if (olen < sizeof(int))
2508 return -EINVAL;
2509
2510 val = *(int *)(table->data) / HZ;
2511 if (put_user(val, (int __user *)oldval))
2512 return -EFAULT;
2513 if (put_user(sizeof(int), oldlenp))
2514 return -EFAULT;
2515 }
2516 }
2517 if (newval && newlen) {
2518 int new;
2519 if (newlen != sizeof(int))
2520 return -EINVAL;
2521 if (get_user(new, (int __user *)newval))
2522 return -EFAULT;
2523 *(int *)(table->data) = new*HZ;
2524 }
2525 return 1;
2526 }
2527
2528 /* Strategy function to convert jiffies to seconds */
2529 int sysctl_ms_jiffies(struct ctl_table *table, int __user *name, int nlen,
2530 void __user *oldval, size_t __user *oldlenp,
2531 void __user *newval, size_t newlen)
2532 {
2533 if (oldval && oldlenp) {
2534 size_t olen;
2535
2536 if (get_user(olen, oldlenp))
2537 return -EFAULT;
2538 if (olen) {
2539 int val;
2540
2541 if (olen < sizeof(int))
2542 return -EINVAL;
2543
2544 val = jiffies_to_msecs(*(int *)(table->data));
2545 if (put_user(val, (int __user *)oldval))
2546 return -EFAULT;
2547 if (put_user(sizeof(int), oldlenp))
2548 return -EFAULT;
2549 }
2550 }
2551 if (newval && newlen) {
2552 int new;
2553 if (newlen != sizeof(int))
2554 return -EINVAL;
2555 if (get_user(new, (int __user *)newval))
2556 return -EFAULT;
2557 *(int *)(table->data) = msecs_to_jiffies(new);
2558 }
2559 return 1;
2560 }
2561
2562
2563
2564 #else /* CONFIG_SYSCTL_SYSCALL */
2565
2566
2567 asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
2568 {
2569 struct __sysctl_args tmp;
2570 int error;
2571
2572 if (copy_from_user(&tmp, args, sizeof(tmp)))
2573 return -EFAULT;
2574
2575 error = deprecated_sysctl_warning(&tmp);
2576
2577 /* If no error reading the parameters then just -ENOSYS ... */
2578 if (!error)
2579 error = -ENOSYS;
2580
2581 return error;
2582 }
2583
2584 int sysctl_data(struct ctl_table *table, int __user *name, int nlen,
2585 void __user *oldval, size_t __user *oldlenp,
2586 void __user *newval, size_t newlen)
2587 {
2588 return -ENOSYS;
2589 }
2590
2591 int sysctl_string(struct ctl_table *table, int __user *name, int nlen,
2592 void __user *oldval, size_t __user *oldlenp,
2593 void __user *newval, size_t newlen)
2594 {
2595 return -ENOSYS;
2596 }
2597
2598 int sysctl_intvec(struct ctl_table *table, int __user *name, int nlen,
2599 void __user *oldval, size_t __user *oldlenp,
2600 void __user *newval, size_t newlen)
2601 {
2602 return -ENOSYS;
2603 }
2604
2605 int sysctl_jiffies(struct ctl_table *table, int __user *name, int nlen,
2606 void __user *oldval, size_t __user *oldlenp,
2607 void __user *newval, size_t newlen)
2608 {
2609 return -ENOSYS;
2610 }
2611
2612 int sysctl_ms_jiffies(struct ctl_table *table, int __user *name, int nlen,
2613 void __user *oldval, size_t __user *oldlenp,
2614 void __user *newval, size_t newlen)
2615 {
2616 return -ENOSYS;
2617 }
2618
2619 #endif /* CONFIG_SYSCTL_SYSCALL */
2620
2621 static int deprecated_sysctl_warning(struct __sysctl_args *args)
2622 {
2623 static int msg_count;
2624 int name[CTL_MAXNAME];
2625 int i;
2626
2627 /* Check args->nlen. */
2628 if (args->nlen < 0 || args->nlen > CTL_MAXNAME)
2629 return -ENOTDIR;
2630
2631 /* Read in the sysctl name for better debug message logging */
2632 for (i = 0; i < args->nlen; i++)
2633 if (get_user(name[i], args->name + i))
2634 return -EFAULT;
2635
2636 /* Ignore accesses to kernel.version */
2637 if ((args->nlen == 2) && (name[0] == CTL_KERN) && (name[1] == KERN_VERSION))
2638 return 0;
2639
2640 if (msg_count < 5) {
2641 msg_count++;
2642 printk(KERN_INFO
2643 "warning: process `%s' used the deprecated sysctl "
2644 "system call with ", current->comm);
2645 for (i = 0; i < args->nlen; i++)
2646 printk("%d.", name[i]);
2647 printk("\n");
2648 }
2649 return 0;
2650 }
2651
2652 /*
2653 * No sense putting this after each symbol definition, twice,
2654 * exception granted :-)
2655 */
2656 EXPORT_SYMBOL(proc_dointvec);
2657 EXPORT_SYMBOL(proc_dointvec_jiffies);
2658 EXPORT_SYMBOL(proc_dointvec_minmax);
2659 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2660 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2661 EXPORT_SYMBOL(proc_dostring);
2662 EXPORT_SYMBOL(proc_doulongvec_minmax);
2663 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
2664 EXPORT_SYMBOL(register_sysctl_table);
2665 EXPORT_SYMBOL(sysctl_intvec);
2666 EXPORT_SYMBOL(sysctl_jiffies);
2667 EXPORT_SYMBOL(sysctl_ms_jiffies);
2668 EXPORT_SYMBOL(sysctl_string);
2669 EXPORT_SYMBOL(sysctl_data);
2670 EXPORT_SYMBOL(unregister_sysctl_table);
SocketAccessConTroL development