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block: add partition attribute for partition number
[linux-2.6/mini2440.git] / kernel / sysctl.c
blob617d41e4d6a08eae69152515e1ac47a9c8a3fc85
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/key.h>
42 #include <linux/times.h>
43 #include <linux/limits.h>
44 #include <linux/dcache.h>
45 #include <linux/syscalls.h>
46 #include <linux/vmstat.h>
47 #include <linux/nfs_fs.h>
48 #include <linux/acpi.h>
49 #include <linux/reboot.h>
50 #include <linux/ftrace.h>
51
52 #include <asm/uaccess.h>
53 #include <asm/processor.h>
54
55 #ifdef CONFIG_X86
56 #include <asm/nmi.h>
57 #include <asm/stacktrace.h>
58 #include <asm/io.h>
59 #endif
60
61 static int deprecated_sysctl_warning(struct __sysctl_args *args);
62
63 #if defined(CONFIG_SYSCTL)
64
65 /* External variables not in a header file. */
66 extern int C_A_D;
67 extern int print_fatal_signals;
68 extern int sysctl_overcommit_memory;
69 extern int sysctl_overcommit_ratio;
70 extern int sysctl_panic_on_oom;
71 extern int sysctl_oom_kill_allocating_task;
72 extern int sysctl_oom_dump_tasks;
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 latencytop_enabled;
84 extern int sysctl_nr_open_min, sysctl_nr_open_max;
85 #ifdef CONFIG_RCU_TORTURE_TEST
86 extern int rcutorture_runnable;
87 #endif /* #ifdef CONFIG_RCU_TORTURE_TEST */
88
89 /* Constants used for minimum and maximum */
90 #if defined(CONFIG_HIGHMEM) || defined(CONFIG_DETECT_SOFTLOCKUP)
91 static int one = 1;
92 #endif
93
94 #ifdef CONFIG_DETECT_SOFTLOCKUP
95 static int sixty = 60;
96 static int neg_one = -1;
97 #endif
98
99 #if defined(CONFIG_MMU) && defined(CONFIG_FILE_LOCKING)
100 static int two = 2;
101 #endif
102
103 static int zero;
104 static int one_hundred = 100;
105
106 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
107 static int maxolduid = 65535;
108 static int minolduid;
109 static int min_percpu_pagelist_fract = 8;
110
111 static int ngroups_max = NGROUPS_MAX;
112
113 #ifdef CONFIG_MODULES
114 extern char modprobe_path[];
115 #endif
116 #ifdef CONFIG_CHR_DEV_SG
117 extern int sg_big_buff;
118 #endif
119
120 #ifdef CONFIG_SPARC
121 #include <asm/system.h>
122 #endif
123
124 #ifdef __hppa__
125 extern int pwrsw_enabled;
126 extern int unaligned_enabled;
127 #endif
128
129 #ifdef CONFIG_S390
130 #ifdef CONFIG_MATHEMU
131 extern int sysctl_ieee_emulation_warnings;
132 #endif
133 extern int sysctl_userprocess_debug;
134 extern int spin_retry;
135 #endif
136
137 #ifdef CONFIG_BSD_PROCESS_ACCT
138 extern int acct_parm[];
139 #endif
140
141 #ifdef CONFIG_IA64
142 extern int no_unaligned_warning;
143 #endif
144
145 #ifdef CONFIG_RT_MUTEXES
146 extern int max_lock_depth;
147 #endif
148
149 #ifdef CONFIG_PROC_SYSCTL
150 static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
151 void __user *buffer, size_t *lenp, loff_t *ppos);
152 static int proc_taint(struct ctl_table *table, int write, struct file *filp,
153 void __user *buffer, size_t *lenp, loff_t *ppos);
154 #endif
155
156 static struct ctl_table root_table[];
157 static struct ctl_table_root sysctl_table_root;
158 static struct ctl_table_header root_table_header = {
159 .count = 1,
160 .ctl_table = root_table,
161 .ctl_entry = LIST_HEAD_INIT(sysctl_table_root.default_set.list),
162 .root = &sysctl_table_root,
163 .set = &sysctl_table_root.default_set,
164 };
165 static struct ctl_table_root sysctl_table_root = {
166 .root_list = LIST_HEAD_INIT(sysctl_table_root.root_list),
167 .default_set.list = LIST_HEAD_INIT(root_table_header.ctl_entry),
168 };
169
170 static struct ctl_table kern_table[];
171 static struct ctl_table vm_table[];
172 static struct ctl_table fs_table[];
173 static struct ctl_table debug_table[];
174 static struct ctl_table dev_table[];
175 extern struct ctl_table random_table[];
176 #ifdef CONFIG_INOTIFY_USER
177 extern struct ctl_table inotify_table[];
178 #endif
179
180 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
181 int sysctl_legacy_va_layout;
182 #endif
183
184 extern int prove_locking;
185 extern int lock_stat;
186
187 /* The default sysctl tables: */
188
189 static struct ctl_table root_table[] = {
190 {
191 .ctl_name = CTL_KERN,
192 .procname = "kernel",
193 .mode = 0555,
194 .child = kern_table,
195 },
196 {
197 .ctl_name = CTL_VM,
198 .procname = "vm",
199 .mode = 0555,
200 .child = vm_table,
201 },
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 int min_sched_granularity_ns = 100000; /* 100 usecs */
229 static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */
230 static int min_wakeup_granularity_ns; /* 0 usecs */
231 static int 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_shares_ratelimit",
272 .data = &sysctl_sched_shares_ratelimit,
273 .maxlen = sizeof(unsigned int),
274 .mode = 0644,
275 .proc_handler = &proc_dointvec,
276 },
277 {
278 .ctl_name = CTL_UNNUMBERED,
279 .procname = "sched_child_runs_first",
280 .data = &sysctl_sched_child_runs_first,
281 .maxlen = sizeof(unsigned int),
282 .mode = 0644,
283 .proc_handler = &proc_dointvec,
284 },
285 {
286 .ctl_name = CTL_UNNUMBERED,
287 .procname = "sched_features",
288 .data = &sysctl_sched_features,
289 .maxlen = sizeof(unsigned int),
290 .mode = 0644,
291 .proc_handler = &proc_dointvec,
292 },
293 {
294 .ctl_name = CTL_UNNUMBERED,
295 .procname = "sched_migration_cost",
296 .data = &sysctl_sched_migration_cost,
297 .maxlen = sizeof(unsigned int),
298 .mode = 0644,
299 .proc_handler = &proc_dointvec,
300 },
301 {
302 .ctl_name = CTL_UNNUMBERED,
303 .procname = "sched_nr_migrate",
304 .data = &sysctl_sched_nr_migrate,
305 .maxlen = sizeof(unsigned int),
306 .mode = 0644,
307 .proc_handler = &proc_dointvec,
308 },
309 #endif
310 {
311 .ctl_name = CTL_UNNUMBERED,
312 .procname = "sched_rt_period_us",
313 .data = &sysctl_sched_rt_period,
314 .maxlen = sizeof(unsigned int),
315 .mode = 0644,
316 .proc_handler = &sched_rt_handler,
317 },
318 {
319 .ctl_name = CTL_UNNUMBERED,
320 .procname = "sched_rt_runtime_us",
321 .data = &sysctl_sched_rt_runtime,
322 .maxlen = sizeof(int),
323 .mode = 0644,
324 .proc_handler = &sched_rt_handler,
325 },
326 {
327 .ctl_name = CTL_UNNUMBERED,
328 .procname = "sched_compat_yield",
329 .data = &sysctl_sched_compat_yield,
330 .maxlen = sizeof(unsigned int),
331 .mode = 0644,
332 .proc_handler = &proc_dointvec,
333 },
334 #ifdef CONFIG_PROVE_LOCKING
335 {
336 .ctl_name = CTL_UNNUMBERED,
337 .procname = "prove_locking",
338 .data = &prove_locking,
339 .maxlen = sizeof(int),
340 .mode = 0644,
341 .proc_handler = &proc_dointvec,
342 },
343 #endif
344 #ifdef CONFIG_LOCK_STAT
345 {
346 .ctl_name = CTL_UNNUMBERED,
347 .procname = "lock_stat",
348 .data = &lock_stat,
349 .maxlen = sizeof(int),
350 .mode = 0644,
351 .proc_handler = &proc_dointvec,
352 },
353 #endif
354 {
355 .ctl_name = KERN_PANIC,
356 .procname = "panic",
357 .data = &panic_timeout,
358 .maxlen = sizeof(int),
359 .mode = 0644,
360 .proc_handler = &proc_dointvec,
361 },
362 {
363 .ctl_name = KERN_CORE_USES_PID,
364 .procname = "core_uses_pid",
365 .data = &core_uses_pid,
366 .maxlen = sizeof(int),
367 .mode = 0644,
368 .proc_handler = &proc_dointvec,
369 },
370 {
371 .ctl_name = KERN_CORE_PATTERN,
372 .procname = "core_pattern",
373 .data = core_pattern,
374 .maxlen = CORENAME_MAX_SIZE,
375 .mode = 0644,
376 .proc_handler = &proc_dostring,
377 .strategy = &sysctl_string,
378 },
379 #ifdef CONFIG_PROC_SYSCTL
380 {
381 .procname = "tainted",
382 .maxlen = sizeof(long),
383 .mode = 0644,
384 .proc_handler = &proc_taint,
385 },
386 #endif
387 #ifdef CONFIG_LATENCYTOP
388 {
389 .procname = "latencytop",
390 .data = &latencytop_enabled,
391 .maxlen = sizeof(int),
392 .mode = 0644,
393 .proc_handler = &proc_dointvec,
394 },
395 #endif
396 #ifdef CONFIG_BLK_DEV_INITRD
397 {
398 .ctl_name = KERN_REALROOTDEV,
399 .procname = "real-root-dev",
400 .data = &real_root_dev,
401 .maxlen = sizeof(int),
402 .mode = 0644,
403 .proc_handler = &proc_dointvec,
404 },
405 #endif
406 {
407 .ctl_name = CTL_UNNUMBERED,
408 .procname = "print-fatal-signals",
409 .data = &print_fatal_signals,
410 .maxlen = sizeof(int),
411 .mode = 0644,
412 .proc_handler = &proc_dointvec,
413 },
414 #ifdef CONFIG_SPARC
415 {
416 .ctl_name = KERN_SPARC_REBOOT,
417 .procname = "reboot-cmd",
418 .data = reboot_command,
419 .maxlen = 256,
420 .mode = 0644,
421 .proc_handler = &proc_dostring,
422 .strategy = &sysctl_string,
423 },
424 {
425 .ctl_name = KERN_SPARC_STOP_A,
426 .procname = "stop-a",
427 .data = &stop_a_enabled,
428 .maxlen = sizeof (int),
429 .mode = 0644,
430 .proc_handler = &proc_dointvec,
431 },
432 {
433 .ctl_name = KERN_SPARC_SCONS_PWROFF,
434 .procname = "scons-poweroff",
435 .data = &scons_pwroff,
436 .maxlen = sizeof (int),
437 .mode = 0644,
438 .proc_handler = &proc_dointvec,
439 },
440 #endif
441 #ifdef __hppa__
442 {
443 .ctl_name = KERN_HPPA_PWRSW,
444 .procname = "soft-power",
445 .data = &pwrsw_enabled,
446 .maxlen = sizeof (int),
447 .mode = 0644,
448 .proc_handler = &proc_dointvec,
449 },
450 {
451 .ctl_name = KERN_HPPA_UNALIGNED,
452 .procname = "unaligned-trap",
453 .data = &unaligned_enabled,
454 .maxlen = sizeof (int),
455 .mode = 0644,
456 .proc_handler = &proc_dointvec,
457 },
458 #endif
459 {
460 .ctl_name = KERN_CTLALTDEL,
461 .procname = "ctrl-alt-del",
462 .data = &C_A_D,
463 .maxlen = sizeof(int),
464 .mode = 0644,
465 .proc_handler = &proc_dointvec,
466 },
467 #ifdef CONFIG_FTRACE
468 {
469 .ctl_name = CTL_UNNUMBERED,
470 .procname = "ftrace_enabled",
471 .data = &ftrace_enabled,
472 .maxlen = sizeof(int),
473 .mode = 0644,
474 .proc_handler = &ftrace_enable_sysctl,
475 },
476 #endif
477 #ifdef CONFIG_MODULES
478 {
479 .ctl_name = KERN_MODPROBE,
480 .procname = "modprobe",
481 .data = &modprobe_path,
482 .maxlen = KMOD_PATH_LEN,
483 .mode = 0644,
484 .proc_handler = &proc_dostring,
485 .strategy = &sysctl_string,
486 },
487 #endif
488 #if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET)
489 {
490 .ctl_name = KERN_HOTPLUG,
491 .procname = "hotplug",
492 .data = &uevent_helper,
493 .maxlen = UEVENT_HELPER_PATH_LEN,
494 .mode = 0644,
495 .proc_handler = &proc_dostring,
496 .strategy = &sysctl_string,
497 },
498 #endif
499 #ifdef CONFIG_CHR_DEV_SG
500 {
501 .ctl_name = KERN_SG_BIG_BUFF,
502 .procname = "sg-big-buff",
503 .data = &sg_big_buff,
504 .maxlen = sizeof (int),
505 .mode = 0444,
506 .proc_handler = &proc_dointvec,
507 },
508 #endif
509 #ifdef CONFIG_BSD_PROCESS_ACCT
510 {
511 .ctl_name = KERN_ACCT,
512 .procname = "acct",
513 .data = &acct_parm,
514 .maxlen = 3*sizeof(int),
515 .mode = 0644,
516 .proc_handler = &proc_dointvec,
517 },
518 #endif
519 #ifdef CONFIG_MAGIC_SYSRQ
520 {
521 .ctl_name = KERN_SYSRQ,
522 .procname = "sysrq",
523 .data = &__sysrq_enabled,
524 .maxlen = sizeof (int),
525 .mode = 0644,
526 .proc_handler = &proc_dointvec,
527 },
528 #endif
529 #ifdef CONFIG_PROC_SYSCTL
530 {
531 .procname = "cad_pid",
532 .data = NULL,
533 .maxlen = sizeof (int),
534 .mode = 0600,
535 .proc_handler = &proc_do_cad_pid,
536 },
537 #endif
538 {
539 .ctl_name = KERN_MAX_THREADS,
540 .procname = "threads-max",
541 .data = &max_threads,
542 .maxlen = sizeof(int),
543 .mode = 0644,
544 .proc_handler = &proc_dointvec,
545 },
546 {
547 .ctl_name = KERN_RANDOM,
548 .procname = "random",
549 .mode = 0555,
550 .child = random_table,
551 },
552 {
553 .ctl_name = KERN_OVERFLOWUID,
554 .procname = "overflowuid",
555 .data = &overflowuid,
556 .maxlen = sizeof(int),
557 .mode = 0644,
558 .proc_handler = &proc_dointvec_minmax,
559 .strategy = &sysctl_intvec,
560 .extra1 = &minolduid,
561 .extra2 = &maxolduid,
562 },
563 {
564 .ctl_name = KERN_OVERFLOWGID,
565 .procname = "overflowgid",
566 .data = &overflowgid,
567 .maxlen = sizeof(int),
568 .mode = 0644,
569 .proc_handler = &proc_dointvec_minmax,
570 .strategy = &sysctl_intvec,
571 .extra1 = &minolduid,
572 .extra2 = &maxolduid,
573 },
574 #ifdef CONFIG_S390
575 #ifdef CONFIG_MATHEMU
576 {
577 .ctl_name = KERN_IEEE_EMULATION_WARNINGS,
578 .procname = "ieee_emulation_warnings",
579 .data = &sysctl_ieee_emulation_warnings,
580 .maxlen = sizeof(int),
581 .mode = 0644,
582 .proc_handler = &proc_dointvec,
583 },
584 #endif
585 {
586 .ctl_name = KERN_S390_USER_DEBUG_LOGGING,
587 .procname = "userprocess_debug",
588 .data = &sysctl_userprocess_debug,
589 .maxlen = sizeof(int),
590 .mode = 0644,
591 .proc_handler = &proc_dointvec,
592 },
593 #endif
594 {
595 .ctl_name = KERN_PIDMAX,
596 .procname = "pid_max",
597 .data = &pid_max,
598 .maxlen = sizeof (int),
599 .mode = 0644,
600 .proc_handler = &proc_dointvec_minmax,
601 .strategy = sysctl_intvec,
602 .extra1 = &pid_max_min,
603 .extra2 = &pid_max_max,
604 },
605 {
606 .ctl_name = KERN_PANIC_ON_OOPS,
607 .procname = "panic_on_oops",
608 .data = &panic_on_oops,
609 .maxlen = sizeof(int),
610 .mode = 0644,
611 .proc_handler = &proc_dointvec,
612 },
613 #if defined CONFIG_PRINTK
614 {
615 .ctl_name = KERN_PRINTK,
616 .procname = "printk",
617 .data = &console_loglevel,
618 .maxlen = 4*sizeof(int),
619 .mode = 0644,
620 .proc_handler = &proc_dointvec,
621 },
622 {
623 .ctl_name = KERN_PRINTK_RATELIMIT,
624 .procname = "printk_ratelimit",
625 .data = &printk_ratelimit_state.interval,
626 .maxlen = sizeof(int),
627 .mode = 0644,
628 .proc_handler = &proc_dointvec_jiffies,
629 .strategy = &sysctl_jiffies,
630 },
631 {
632 .ctl_name = KERN_PRINTK_RATELIMIT_BURST,
633 .procname = "printk_ratelimit_burst",
634 .data = &printk_ratelimit_state.burst,
635 .maxlen = sizeof(int),
636 .mode = 0644,
637 .proc_handler = &proc_dointvec,
638 },
639 #endif
640 {
641 .ctl_name = KERN_NGROUPS_MAX,
642 .procname = "ngroups_max",
643 .data = &ngroups_max,
644 .maxlen = sizeof (int),
645 .mode = 0444,
646 .proc_handler = &proc_dointvec,
647 },
648 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
649 {
650 .ctl_name = KERN_UNKNOWN_NMI_PANIC,
651 .procname = "unknown_nmi_panic",
652 .data = &unknown_nmi_panic,
653 .maxlen = sizeof (int),
654 .mode = 0644,
655 .proc_handler = &proc_dointvec,
656 },
657 {
658 .procname = "nmi_watchdog",
659 .data = &nmi_watchdog_enabled,
660 .maxlen = sizeof (int),
661 .mode = 0644,
662 .proc_handler = &proc_nmi_enabled,
663 },
664 #endif
665 #if defined(CONFIG_X86)
666 {
667 .ctl_name = KERN_PANIC_ON_NMI,
668 .procname = "panic_on_unrecovered_nmi",
669 .data = &panic_on_unrecovered_nmi,
670 .maxlen = sizeof(int),
671 .mode = 0644,
672 .proc_handler = &proc_dointvec,
673 },
674 {
675 .ctl_name = KERN_BOOTLOADER_TYPE,
676 .procname = "bootloader_type",
677 .data = &bootloader_type,
678 .maxlen = sizeof (int),
679 .mode = 0444,
680 .proc_handler = &proc_dointvec,
681 },
682 {
683 .ctl_name = CTL_UNNUMBERED,
684 .procname = "kstack_depth_to_print",
685 .data = &kstack_depth_to_print,
686 .maxlen = sizeof(int),
687 .mode = 0644,
688 .proc_handler = &proc_dointvec,
689 },
690 {
691 .ctl_name = CTL_UNNUMBERED,
692 .procname = "io_delay_type",
693 .data = &io_delay_type,
694 .maxlen = sizeof(int),
695 .mode = 0644,
696 .proc_handler = &proc_dointvec,
697 },
698 #endif
699 #if defined(CONFIG_MMU)
700 {
701 .ctl_name = KERN_RANDOMIZE,
702 .procname = "randomize_va_space",
703 .data = &randomize_va_space,
704 .maxlen = sizeof(int),
705 .mode = 0644,
706 .proc_handler = &proc_dointvec,
707 },
708 #endif
709 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
710 {
711 .ctl_name = KERN_SPIN_RETRY,
712 .procname = "spin_retry",
713 .data = &spin_retry,
714 .maxlen = sizeof (int),
715 .mode = 0644,
716 .proc_handler = &proc_dointvec,
717 },
718 #endif
719 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
720 {
721 .procname = "acpi_video_flags",
722 .data = &acpi_realmode_flags,
723 .maxlen = sizeof (unsigned long),
724 .mode = 0644,
725 .proc_handler = &proc_doulongvec_minmax,
726 },
727 #endif
728 #ifdef CONFIG_IA64
729 {
730 .ctl_name = KERN_IA64_UNALIGNED,
731 .procname = "ignore-unaligned-usertrap",
732 .data = &no_unaligned_warning,
733 .maxlen = sizeof (int),
734 .mode = 0644,
735 .proc_handler = &proc_dointvec,
736 },
737 #endif
738 #ifdef CONFIG_DETECT_SOFTLOCKUP
739 {
740 .ctl_name = CTL_UNNUMBERED,
741 .procname = "softlockup_panic",
742 .data = &softlockup_panic,
743 .maxlen = sizeof(int),
744 .mode = 0644,
745 .proc_handler = &proc_dointvec_minmax,
746 .strategy = &sysctl_intvec,
747 .extra1 = &zero,
748 .extra2 = &one,
749 },
750 {
751 .ctl_name = CTL_UNNUMBERED,
752 .procname = "softlockup_thresh",
753 .data = &softlockup_thresh,
754 .maxlen = sizeof(int),
755 .mode = 0644,
756 .proc_handler = &proc_dointvec_minmax,
757 .strategy = &sysctl_intvec,
758 .extra1 = &neg_one,
759 .extra2 = &sixty,
760 },
761 {
762 .ctl_name = CTL_UNNUMBERED,
763 .procname = "hung_task_check_count",
764 .data = &sysctl_hung_task_check_count,
765 .maxlen = sizeof(unsigned long),
766 .mode = 0644,
767 .proc_handler = &proc_doulongvec_minmax,
768 .strategy = &sysctl_intvec,
769 },
770 {
771 .ctl_name = CTL_UNNUMBERED,
772 .procname = "hung_task_timeout_secs",
773 .data = &sysctl_hung_task_timeout_secs,
774 .maxlen = sizeof(unsigned long),
775 .mode = 0644,
776 .proc_handler = &proc_doulongvec_minmax,
777 .strategy = &sysctl_intvec,
778 },
779 {
780 .ctl_name = CTL_UNNUMBERED,
781 .procname = "hung_task_warnings",
782 .data = &sysctl_hung_task_warnings,
783 .maxlen = sizeof(unsigned long),
784 .mode = 0644,
785 .proc_handler = &proc_doulongvec_minmax,
786 .strategy = &sysctl_intvec,
787 },
788 #endif
789 #ifdef CONFIG_COMPAT
790 {
791 .ctl_name = KERN_COMPAT_LOG,
792 .procname = "compat-log",
793 .data = &compat_log,
794 .maxlen = sizeof (int),
795 .mode = 0644,
796 .proc_handler = &proc_dointvec,
797 },
798 #endif
799 #ifdef CONFIG_RT_MUTEXES
800 {
801 .ctl_name = KERN_MAX_LOCK_DEPTH,
802 .procname = "max_lock_depth",
803 .data = &max_lock_depth,
804 .maxlen = sizeof(int),
805 .mode = 0644,
806 .proc_handler = &proc_dointvec,
807 },
808 #endif
809 {
810 .ctl_name = CTL_UNNUMBERED,
811 .procname = "poweroff_cmd",
812 .data = &poweroff_cmd,
813 .maxlen = POWEROFF_CMD_PATH_LEN,
814 .mode = 0644,
815 .proc_handler = &proc_dostring,
816 .strategy = &sysctl_string,
817 },
818 #ifdef CONFIG_KEYS
819 {
820 .ctl_name = CTL_UNNUMBERED,
821 .procname = "keys",
822 .mode = 0555,
823 .child = key_sysctls,
824 },
825 #endif
826 #ifdef CONFIG_RCU_TORTURE_TEST
827 {
828 .ctl_name = CTL_UNNUMBERED,
829 .procname = "rcutorture_runnable",
830 .data = &rcutorture_runnable,
831 .maxlen = sizeof(int),
832 .mode = 0644,
833 .proc_handler = &proc_dointvec,
834 },
835 #endif
836 /*
837 * NOTE: do not add new entries to this table unless you have read
838 * Documentation/sysctl/ctl_unnumbered.txt
839 */
840 { .ctl_name = 0 }
841 };
842
843 static struct ctl_table vm_table[] = {
844 {
845 .ctl_name = VM_OVERCOMMIT_MEMORY,
846 .procname = "overcommit_memory",
847 .data = &sysctl_overcommit_memory,
848 .maxlen = sizeof(sysctl_overcommit_memory),
849 .mode = 0644,
850 .proc_handler = &proc_dointvec,
851 },
852 {
853 .ctl_name = VM_PANIC_ON_OOM,
854 .procname = "panic_on_oom",
855 .data = &sysctl_panic_on_oom,
856 .maxlen = sizeof(sysctl_panic_on_oom),
857 .mode = 0644,
858 .proc_handler = &proc_dointvec,
859 },
860 {
861 .ctl_name = CTL_UNNUMBERED,
862 .procname = "oom_kill_allocating_task",
863 .data = &sysctl_oom_kill_allocating_task,
864 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
865 .mode = 0644,
866 .proc_handler = &proc_dointvec,
867 },
868 {
869 .ctl_name = CTL_UNNUMBERED,
870 .procname = "oom_dump_tasks",
871 .data = &sysctl_oom_dump_tasks,
872 .maxlen = sizeof(sysctl_oom_dump_tasks),
873 .mode = 0644,
874 .proc_handler = &proc_dointvec,
875 },
876 {
877 .ctl_name = VM_OVERCOMMIT_RATIO,
878 .procname = "overcommit_ratio",
879 .data = &sysctl_overcommit_ratio,
880 .maxlen = sizeof(sysctl_overcommit_ratio),
881 .mode = 0644,
882 .proc_handler = &proc_dointvec,
883 },
884 {
885 .ctl_name = VM_PAGE_CLUSTER,
886 .procname = "page-cluster",
887 .data = &page_cluster,
888 .maxlen = sizeof(int),
889 .mode = 0644,
890 .proc_handler = &proc_dointvec,
891 },
892 {
893 .ctl_name = VM_DIRTY_BACKGROUND,
894 .procname = "dirty_background_ratio",
895 .data = &dirty_background_ratio,
896 .maxlen = sizeof(dirty_background_ratio),
897 .mode = 0644,
898 .proc_handler = &proc_dointvec_minmax,
899 .strategy = &sysctl_intvec,
900 .extra1 = &zero,
901 .extra2 = &one_hundred,
902 },
903 {
904 .ctl_name = VM_DIRTY_RATIO,
905 .procname = "dirty_ratio",
906 .data = &vm_dirty_ratio,
907 .maxlen = sizeof(vm_dirty_ratio),
908 .mode = 0644,
909 .proc_handler = &dirty_ratio_handler,
910 .strategy = &sysctl_intvec,
911 .extra1 = &zero,
912 .extra2 = &one_hundred,
913 },
914 {
915 .procname = "dirty_writeback_centisecs",
916 .data = &dirty_writeback_interval,
917 .maxlen = sizeof(dirty_writeback_interval),
918 .mode = 0644,
919 .proc_handler = &dirty_writeback_centisecs_handler,
920 },
921 {
922 .procname = "dirty_expire_centisecs",
923 .data = &dirty_expire_interval,
924 .maxlen = sizeof(dirty_expire_interval),
925 .mode = 0644,
926 .proc_handler = &proc_dointvec_userhz_jiffies,
927 },
928 {
929 .ctl_name = VM_NR_PDFLUSH_THREADS,
930 .procname = "nr_pdflush_threads",
931 .data = &nr_pdflush_threads,
932 .maxlen = sizeof nr_pdflush_threads,
933 .mode = 0444 /* read-only*/,
934 .proc_handler = &proc_dointvec,
935 },
936 {
937 .ctl_name = VM_SWAPPINESS,
938 .procname = "swappiness",
939 .data = &vm_swappiness,
940 .maxlen = sizeof(vm_swappiness),
941 .mode = 0644,
942 .proc_handler = &proc_dointvec_minmax,
943 .strategy = &sysctl_intvec,
944 .extra1 = &zero,
945 .extra2 = &one_hundred,
946 },
947 #ifdef CONFIG_HUGETLB_PAGE
948 {
949 .procname = "nr_hugepages",
950 .data = NULL,
951 .maxlen = sizeof(unsigned long),
952 .mode = 0644,
953 .proc_handler = &hugetlb_sysctl_handler,
954 .extra1 = (void *)&hugetlb_zero,
955 .extra2 = (void *)&hugetlb_infinity,
956 },
957 {
958 .ctl_name = VM_HUGETLB_GROUP,
959 .procname = "hugetlb_shm_group",
960 .data = &sysctl_hugetlb_shm_group,
961 .maxlen = sizeof(gid_t),
962 .mode = 0644,
963 .proc_handler = &proc_dointvec,
964 },
965 {
966 .ctl_name = CTL_UNNUMBERED,
967 .procname = "hugepages_treat_as_movable",
968 .data = &hugepages_treat_as_movable,
969 .maxlen = sizeof(int),
970 .mode = 0644,
971 .proc_handler = &hugetlb_treat_movable_handler,
972 },
973 {
974 .ctl_name = CTL_UNNUMBERED,
975 .procname = "nr_overcommit_hugepages",
976 .data = NULL,
977 .maxlen = sizeof(unsigned long),
978 .mode = 0644,
979 .proc_handler = &hugetlb_overcommit_handler,
980 .extra1 = (void *)&hugetlb_zero,
981 .extra2 = (void *)&hugetlb_infinity,
982 },
983 #endif
984 {
985 .ctl_name = VM_LOWMEM_RESERVE_RATIO,
986 .procname = "lowmem_reserve_ratio",
987 .data = &sysctl_lowmem_reserve_ratio,
988 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
989 .mode = 0644,
990 .proc_handler = &lowmem_reserve_ratio_sysctl_handler,
991 .strategy = &sysctl_intvec,
992 },
993 {
994 .ctl_name = VM_DROP_PAGECACHE,
995 .procname = "drop_caches",
996 .data = &sysctl_drop_caches,
997 .maxlen = sizeof(int),
998 .mode = 0644,
999 .proc_handler = drop_caches_sysctl_handler,
1000 .strategy = &sysctl_intvec,
1001 },
1002 {
1003 .ctl_name = VM_MIN_FREE_KBYTES,
1004 .procname = "min_free_kbytes",
1005 .data = &min_free_kbytes,
1006 .maxlen = sizeof(min_free_kbytes),
1007 .mode = 0644,
1008 .proc_handler = &min_free_kbytes_sysctl_handler,
1009 .strategy = &sysctl_intvec,
1010 .extra1 = &zero,
1011 },
1012 {
1013 .ctl_name = VM_PERCPU_PAGELIST_FRACTION,
1014 .procname = "percpu_pagelist_fraction",
1015 .data = &percpu_pagelist_fraction,
1016 .maxlen = sizeof(percpu_pagelist_fraction),
1017 .mode = 0644,
1018 .proc_handler = &percpu_pagelist_fraction_sysctl_handler,
1019 .strategy = &sysctl_intvec,
1020 .extra1 = &min_percpu_pagelist_fract,
1021 },
1022 #ifdef CONFIG_MMU
1023 {
1024 .ctl_name = VM_MAX_MAP_COUNT,
1025 .procname = "max_map_count",
1026 .data = &sysctl_max_map_count,
1027 .maxlen = sizeof(sysctl_max_map_count),
1028 .mode = 0644,
1029 .proc_handler = &proc_dointvec
1030 },
1031 #endif
1032 {
1033 .ctl_name = VM_LAPTOP_MODE,
1034 .procname = "laptop_mode",
1035 .data = &laptop_mode,
1036 .maxlen = sizeof(laptop_mode),
1037 .mode = 0644,
1038 .proc_handler = &proc_dointvec_jiffies,
1039 .strategy = &sysctl_jiffies,
1040 },
1041 {
1042 .ctl_name = VM_BLOCK_DUMP,
1043 .procname = "block_dump",
1044 .data = &block_dump,
1045 .maxlen = sizeof(block_dump),
1046 .mode = 0644,
1047 .proc_handler = &proc_dointvec,
1048 .strategy = &sysctl_intvec,
1049 .extra1 = &zero,
1050 },
1051 {
1052 .ctl_name = VM_VFS_CACHE_PRESSURE,
1053 .procname = "vfs_cache_pressure",
1054 .data = &sysctl_vfs_cache_pressure,
1055 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1056 .mode = 0644,
1057 .proc_handler = &proc_dointvec,
1058 .strategy = &sysctl_intvec,
1059 .extra1 = &zero,
1060 },
1061 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1062 {
1063 .ctl_name = VM_LEGACY_VA_LAYOUT,
1064 .procname = "legacy_va_layout",
1065 .data = &sysctl_legacy_va_layout,
1066 .maxlen = sizeof(sysctl_legacy_va_layout),
1067 .mode = 0644,
1068 .proc_handler = &proc_dointvec,
1069 .strategy = &sysctl_intvec,
1070 .extra1 = &zero,
1071 },
1072 #endif
1073 #ifdef CONFIG_NUMA
1074 {
1075 .ctl_name = VM_ZONE_RECLAIM_MODE,
1076 .procname = "zone_reclaim_mode",
1077 .data = &zone_reclaim_mode,
1078 .maxlen = sizeof(zone_reclaim_mode),
1079 .mode = 0644,
1080 .proc_handler = &proc_dointvec,
1081 .strategy = &sysctl_intvec,
1082 .extra1 = &zero,
1083 },
1084 {
1085 .ctl_name = VM_MIN_UNMAPPED,
1086 .procname = "min_unmapped_ratio",
1087 .data = &sysctl_min_unmapped_ratio,
1088 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1089 .mode = 0644,
1090 .proc_handler = &sysctl_min_unmapped_ratio_sysctl_handler,
1091 .strategy = &sysctl_intvec,
1092 .extra1 = &zero,
1093 .extra2 = &one_hundred,
1094 },
1095 {
1096 .ctl_name = VM_MIN_SLAB,
1097 .procname = "min_slab_ratio",
1098 .data = &sysctl_min_slab_ratio,
1099 .maxlen = sizeof(sysctl_min_slab_ratio),
1100 .mode = 0644,
1101 .proc_handler = &sysctl_min_slab_ratio_sysctl_handler,
1102 .strategy = &sysctl_intvec,
1103 .extra1 = &zero,
1104 .extra2 = &one_hundred,
1105 },
1106 #endif
1107 #ifdef CONFIG_SMP
1108 {
1109 .ctl_name = CTL_UNNUMBERED,
1110 .procname = "stat_interval",
1111 .data = &sysctl_stat_interval,
1112 .maxlen = sizeof(sysctl_stat_interval),
1113 .mode = 0644,
1114 .proc_handler = &proc_dointvec_jiffies,
1115 .strategy = &sysctl_jiffies,
1116 },
1117 #endif
1118 #ifdef CONFIG_SECURITY
1119 {
1120 .ctl_name = CTL_UNNUMBERED,
1121 .procname = "mmap_min_addr",
1122 .data = &mmap_min_addr,
1123 .maxlen = sizeof(unsigned long),
1124 .mode = 0644,
1125 .proc_handler = &proc_doulongvec_minmax,
1126 },
1127 #endif
1128 #ifdef CONFIG_NUMA
1129 {
1130 .ctl_name = CTL_UNNUMBERED,
1131 .procname = "numa_zonelist_order",
1132 .data = &numa_zonelist_order,
1133 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1134 .mode = 0644,
1135 .proc_handler = &numa_zonelist_order_handler,
1136 .strategy = &sysctl_string,
1137 },
1138 #endif
1139 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1140 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1141 {
1142 .ctl_name = VM_VDSO_ENABLED,
1143 .procname = "vdso_enabled",
1144 .data = &vdso_enabled,
1145 .maxlen = sizeof(vdso_enabled),
1146 .mode = 0644,
1147 .proc_handler = &proc_dointvec,
1148 .strategy = &sysctl_intvec,
1149 .extra1 = &zero,
1150 },
1151 #endif
1152 #ifdef CONFIG_HIGHMEM
1153 {
1154 .ctl_name = CTL_UNNUMBERED,
1155 .procname = "highmem_is_dirtyable",
1156 .data = &vm_highmem_is_dirtyable,
1157 .maxlen = sizeof(vm_highmem_is_dirtyable),
1158 .mode = 0644,
1159 .proc_handler = &proc_dointvec_minmax,
1160 .strategy = &sysctl_intvec,
1161 .extra1 = &zero,
1162 .extra2 = &one,
1163 },
1164 #endif
1165 /*
1166 * NOTE: do not add new entries to this table unless you have read
1167 * Documentation/sysctl/ctl_unnumbered.txt
1168 */
1169 { .ctl_name = 0 }
1170 };
1171
1172 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1173 static struct ctl_table binfmt_misc_table[] = {
1174 { .ctl_name = 0 }
1175 };
1176 #endif
1177
1178 static struct ctl_table fs_table[] = {
1179 {
1180 .ctl_name = FS_NRINODE,
1181 .procname = "inode-nr",
1182 .data = &inodes_stat,
1183 .maxlen = 2*sizeof(int),
1184 .mode = 0444,
1185 .proc_handler = &proc_dointvec,
1186 },
1187 {
1188 .ctl_name = FS_STATINODE,
1189 .procname = "inode-state",
1190 .data = &inodes_stat,
1191 .maxlen = 7*sizeof(int),
1192 .mode = 0444,
1193 .proc_handler = &proc_dointvec,
1194 },
1195 {
1196 .procname = "file-nr",
1197 .data = &files_stat,
1198 .maxlen = 3*sizeof(int),
1199 .mode = 0444,
1200 .proc_handler = &proc_nr_files,
1201 },
1202 {
1203 .ctl_name = FS_MAXFILE,
1204 .procname = "file-max",
1205 .data = &files_stat.max_files,
1206 .maxlen = sizeof(int),
1207 .mode = 0644,
1208 .proc_handler = &proc_dointvec,
1209 },
1210 {
1211 .ctl_name = CTL_UNNUMBERED,
1212 .procname = "nr_open",
1213 .data = &sysctl_nr_open,
1214 .maxlen = sizeof(int),
1215 .mode = 0644,
1216 .proc_handler = &proc_dointvec_minmax,
1217 .extra1 = &sysctl_nr_open_min,
1218 .extra2 = &sysctl_nr_open_max,
1219 },
1220 {
1221 .ctl_name = FS_DENTRY,
1222 .procname = "dentry-state",
1223 .data = &dentry_stat,
1224 .maxlen = 6*sizeof(int),
1225 .mode = 0444,
1226 .proc_handler = &proc_dointvec,
1227 },
1228 {
1229 .ctl_name = FS_OVERFLOWUID,
1230 .procname = "overflowuid",
1231 .data = &fs_overflowuid,
1232 .maxlen = sizeof(int),
1233 .mode = 0644,
1234 .proc_handler = &proc_dointvec_minmax,
1235 .strategy = &sysctl_intvec,
1236 .extra1 = &minolduid,
1237 .extra2 = &maxolduid,
1238 },
1239 {
1240 .ctl_name = FS_OVERFLOWGID,
1241 .procname = "overflowgid",
1242 .data = &fs_overflowgid,
1243 .maxlen = sizeof(int),
1244 .mode = 0644,
1245 .proc_handler = &proc_dointvec_minmax,
1246 .strategy = &sysctl_intvec,
1247 .extra1 = &minolduid,
1248 .extra2 = &maxolduid,
1249 },
1250 #ifdef CONFIG_FILE_LOCKING
1251 {
1252 .ctl_name = FS_LEASES,
1253 .procname = "leases-enable",
1254 .data = &leases_enable,
1255 .maxlen = sizeof(int),
1256 .mode = 0644,
1257 .proc_handler = &proc_dointvec,
1258 },
1259 #endif
1260 #ifdef CONFIG_DNOTIFY
1261 {
1262 .ctl_name = FS_DIR_NOTIFY,
1263 .procname = "dir-notify-enable",
1264 .data = &dir_notify_enable,
1265 .maxlen = sizeof(int),
1266 .mode = 0644,
1267 .proc_handler = &proc_dointvec,
1268 },
1269 #endif
1270 #ifdef CONFIG_MMU
1271 #ifdef CONFIG_FILE_LOCKING
1272 {
1273 .ctl_name = FS_LEASE_TIME,
1274 .procname = "lease-break-time",
1275 .data = &lease_break_time,
1276 .maxlen = sizeof(int),
1277 .mode = 0644,
1278 .proc_handler = &proc_dointvec_minmax,
1279 .strategy = &sysctl_intvec,
1280 .extra1 = &zero,
1281 .extra2 = &two,
1282 },
1283 #endif
1284 #ifdef CONFIG_AIO
1285 {
1286 .procname = "aio-nr",
1287 .data = &aio_nr,
1288 .maxlen = sizeof(aio_nr),
1289 .mode = 0444,
1290 .proc_handler = &proc_doulongvec_minmax,
1291 },
1292 {
1293 .procname = "aio-max-nr",
1294 .data = &aio_max_nr,
1295 .maxlen = sizeof(aio_max_nr),
1296 .mode = 0644,
1297 .proc_handler = &proc_doulongvec_minmax,
1298 },
1299 #endif /* CONFIG_AIO */
1300 #ifdef CONFIG_INOTIFY_USER
1301 {
1302 .ctl_name = FS_INOTIFY,
1303 .procname = "inotify",
1304 .mode = 0555,
1305 .child = inotify_table,
1306 },
1307 #endif
1308 #endif
1309 {
1310 .ctl_name = KERN_SETUID_DUMPABLE,
1311 .procname = "suid_dumpable",
1312 .data = &suid_dumpable,
1313 .maxlen = sizeof(int),
1314 .mode = 0644,
1315 .proc_handler = &proc_dointvec,
1316 },
1317 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1318 {
1319 .ctl_name = CTL_UNNUMBERED,
1320 .procname = "binfmt_misc",
1321 .mode = 0555,
1322 .child = binfmt_misc_table,
1323 },
1324 #endif
1325 /*
1326 * NOTE: do not add new entries to this table unless you have read
1327 * Documentation/sysctl/ctl_unnumbered.txt
1328 */
1329 { .ctl_name = 0 }
1330 };
1331
1332 static struct ctl_table debug_table[] = {
1333 #if defined(CONFIG_X86) || defined(CONFIG_PPC)
1334 {
1335 .ctl_name = CTL_UNNUMBERED,
1336 .procname = "exception-trace",
1337 .data = &show_unhandled_signals,
1338 .maxlen = sizeof(int),
1339 .mode = 0644,
1340 .proc_handler = proc_dointvec
1341 },
1342 #endif
1343 { .ctl_name = 0 }
1344 };
1345
1346 static struct ctl_table dev_table[] = {
1347 { .ctl_name = 0 }
1348 };
1349
1350 static DEFINE_SPINLOCK(sysctl_lock);
1351
1352 /* called under sysctl_lock */
1353 static int use_table(struct ctl_table_header *p)
1354 {
1355 if (unlikely(p->unregistering))
1356 return 0;
1357 p->used++;
1358 return 1;
1359 }
1360
1361 /* called under sysctl_lock */
1362 static void unuse_table(struct ctl_table_header *p)
1363 {
1364 if (!--p->used)
1365 if (unlikely(p->unregistering))
1366 complete(p->unregistering);
1367 }
1368
1369 /* called under sysctl_lock, will reacquire if has to wait */
1370 static void start_unregistering(struct ctl_table_header *p)
1371 {
1372 /*
1373 * if p->used is 0, nobody will ever touch that entry again;
1374 * we'll eliminate all paths to it before dropping sysctl_lock
1375 */
1376 if (unlikely(p->used)) {
1377 struct completion wait;
1378 init_completion(&wait);
1379 p->unregistering = &wait;
1380 spin_unlock(&sysctl_lock);
1381 wait_for_completion(&wait);
1382 spin_lock(&sysctl_lock);
1383 } else {
1384 /* anything non-NULL; we'll never dereference it */
1385 p->unregistering = ERR_PTR(-EINVAL);
1386 }
1387 /*
1388 * do not remove from the list until nobody holds it; walking the
1389 * list in do_sysctl() relies on that.
1390 */
1391 list_del_init(&p->ctl_entry);
1392 }
1393
1394 void sysctl_head_get(struct ctl_table_header *head)
1395 {
1396 spin_lock(&sysctl_lock);
1397 head->count++;
1398 spin_unlock(&sysctl_lock);
1399 }
1400
1401 void sysctl_head_put(struct ctl_table_header *head)
1402 {
1403 spin_lock(&sysctl_lock);
1404 if (!--head->count)
1405 kfree(head);
1406 spin_unlock(&sysctl_lock);
1407 }
1408
1409 struct ctl_table_header *sysctl_head_grab(struct ctl_table_header *head)
1410 {
1411 if (!head)
1412 BUG();
1413 spin_lock(&sysctl_lock);
1414 if (!use_table(head))
1415 head = ERR_PTR(-ENOENT);
1416 spin_unlock(&sysctl_lock);
1417 return head;
1418 }
1419
1420 void sysctl_head_finish(struct ctl_table_header *head)
1421 {
1422 if (!head)
1423 return;
1424 spin_lock(&sysctl_lock);
1425 unuse_table(head);
1426 spin_unlock(&sysctl_lock);
1427 }
1428
1429 static struct ctl_table_set *
1430 lookup_header_set(struct ctl_table_root *root, struct nsproxy *namespaces)
1431 {
1432 struct ctl_table_set *set = &root->default_set;
1433 if (root->lookup)
1434 set = root->lookup(root, namespaces);
1435 return set;
1436 }
1437
1438 static struct list_head *
1439 lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces)
1440 {
1441 struct ctl_table_set *set = lookup_header_set(root, namespaces);
1442 return &set->list;
1443 }
1444
1445 struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces,
1446 struct ctl_table_header *prev)
1447 {
1448 struct ctl_table_root *root;
1449 struct list_head *header_list;
1450 struct ctl_table_header *head;
1451 struct list_head *tmp;
1452
1453 spin_lock(&sysctl_lock);
1454 if (prev) {
1455 head = prev;
1456 tmp = &prev->ctl_entry;
1457 unuse_table(prev);
1458 goto next;
1459 }
1460 tmp = &root_table_header.ctl_entry;
1461 for (;;) {
1462 head = list_entry(tmp, struct ctl_table_header, ctl_entry);
1463
1464 if (!use_table(head))
1465 goto next;
1466 spin_unlock(&sysctl_lock);
1467 return head;
1468 next:
1469 root = head->root;
1470 tmp = tmp->next;
1471 header_list = lookup_header_list(root, namespaces);
1472 if (tmp != header_list)
1473 continue;
1474
1475 do {
1476 root = list_entry(root->root_list.next,
1477 struct ctl_table_root, root_list);
1478 if (root == &sysctl_table_root)
1479 goto out;
1480 header_list = lookup_header_list(root, namespaces);
1481 } while (list_empty(header_list));
1482 tmp = header_list->next;
1483 }
1484 out:
1485 spin_unlock(&sysctl_lock);
1486 return NULL;
1487 }
1488
1489 struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev)
1490 {
1491 return __sysctl_head_next(current->nsproxy, prev);
1492 }
1493
1494 void register_sysctl_root(struct ctl_table_root *root)
1495 {
1496 spin_lock(&sysctl_lock);
1497 list_add_tail(&root->root_list, &sysctl_table_root.root_list);
1498 spin_unlock(&sysctl_lock);
1499 }
1500
1501 #ifdef CONFIG_SYSCTL_SYSCALL
1502 /* Perform the actual read/write of a sysctl table entry. */
1503 static int do_sysctl_strategy(struct ctl_table_root *root,
1504 struct ctl_table *table,
1505 void __user *oldval, size_t __user *oldlenp,
1506 void __user *newval, size_t newlen)
1507 {
1508 int op = 0, rc;
1509
1510 if (oldval)
1511 op |= MAY_READ;
1512 if (newval)
1513 op |= MAY_WRITE;
1514 if (sysctl_perm(root, table, op))
1515 return -EPERM;
1516
1517 if (table->strategy) {
1518 rc = table->strategy(table, oldval, oldlenp, newval, newlen);
1519 if (rc < 0)
1520 return rc;
1521 if (rc > 0)
1522 return 0;
1523 }
1524
1525 /* If there is no strategy routine, or if the strategy returns
1526 * zero, proceed with automatic r/w */
1527 if (table->data && table->maxlen) {
1528 rc = sysctl_data(table, oldval, oldlenp, newval, newlen);
1529 if (rc < 0)
1530 return rc;
1531 }
1532 return 0;
1533 }
1534
1535 static int parse_table(int __user *name, int nlen,
1536 void __user *oldval, size_t __user *oldlenp,
1537 void __user *newval, size_t newlen,
1538 struct ctl_table_root *root,
1539 struct ctl_table *table)
1540 {
1541 int n;
1542 repeat:
1543 if (!nlen)
1544 return -ENOTDIR;
1545 if (get_user(n, name))
1546 return -EFAULT;
1547 for ( ; table->ctl_name || table->procname; table++) {
1548 if (!table->ctl_name)
1549 continue;
1550 if (n == table->ctl_name) {
1551 int error;
1552 if (table->child) {
1553 if (sysctl_perm(root, table, MAY_EXEC))
1554 return -EPERM;
1555 name++;
1556 nlen--;
1557 table = table->child;
1558 goto repeat;
1559 }
1560 error = do_sysctl_strategy(root, table,
1561 oldval, oldlenp,
1562 newval, newlen);
1563 return error;
1564 }
1565 }
1566 return -ENOTDIR;
1567 }
1568
1569 int do_sysctl(int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp,
1570 void __user *newval, size_t newlen)
1571 {
1572 struct ctl_table_header *head;
1573 int error = -ENOTDIR;
1574
1575 if (nlen <= 0 || nlen >= CTL_MAXNAME)
1576 return -ENOTDIR;
1577 if (oldval) {
1578 int old_len;
1579 if (!oldlenp || get_user(old_len, oldlenp))
1580 return -EFAULT;
1581 }
1582
1583 for (head = sysctl_head_next(NULL); head;
1584 head = sysctl_head_next(head)) {
1585 error = parse_table(name, nlen, oldval, oldlenp,
1586 newval, newlen,
1587 head->root, head->ctl_table);
1588 if (error != -ENOTDIR) {
1589 sysctl_head_finish(head);
1590 break;
1591 }
1592 }
1593 return error;
1594 }
1595
1596 asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
1597 {
1598 struct __sysctl_args tmp;
1599 int error;
1600
1601 if (copy_from_user(&tmp, args, sizeof(tmp)))
1602 return -EFAULT;
1603
1604 error = deprecated_sysctl_warning(&tmp);
1605 if (error)
1606 goto out;
1607
1608 lock_kernel();
1609 error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp,
1610 tmp.newval, tmp.newlen);
1611 unlock_kernel();
1612 out:
1613 return error;
1614 }
1615 #endif /* CONFIG_SYSCTL_SYSCALL */
1616
1617 /*
1618 * sysctl_perm does NOT grant the superuser all rights automatically, because
1619 * some sysctl variables are readonly even to root.
1620 */
1621
1622 static int test_perm(int mode, int op)
1623 {
1624 if (!current->euid)
1625 mode >>= 6;
1626 else if (in_egroup_p(0))
1627 mode >>= 3;
1628 if ((op & ~mode & (MAY_READ|MAY_WRITE|MAY_EXEC)) == 0)
1629 return 0;
1630 return -EACCES;
1631 }
1632
1633 int sysctl_perm(struct ctl_table_root *root, struct ctl_table *table, int op)
1634 {
1635 int error;
1636 int mode;
1637
1638 error = security_sysctl(table, op & (MAY_READ | MAY_WRITE | MAY_EXEC));
1639 if (error)
1640 return error;
1641
1642 if (root->permissions)
1643 mode = root->permissions(root, current->nsproxy, table);
1644 else
1645 mode = table->mode;
1646
1647 return test_perm(mode, op);
1648 }
1649
1650 static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table)
1651 {
1652 for (; table->ctl_name || table->procname; table++) {
1653 table->parent = parent;
1654 if (table->child)
1655 sysctl_set_parent(table, table->child);
1656 }
1657 }
1658
1659 static __init int sysctl_init(void)
1660 {
1661 sysctl_set_parent(NULL, root_table);
1662 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK
1663 {
1664 int err;
1665 err = sysctl_check_table(current->nsproxy, root_table);
1666 }
1667 #endif
1668 return 0;
1669 }
1670
1671 core_initcall(sysctl_init);
1672
1673 static struct ctl_table *is_branch_in(struct ctl_table *branch,
1674 struct ctl_table *table)
1675 {
1676 struct ctl_table *p;
1677 const char *s = branch->procname;
1678
1679 /* branch should have named subdirectory as its first element */
1680 if (!s || !branch->child)
1681 return NULL;
1682
1683 /* ... and nothing else */
1684 if (branch[1].procname || branch[1].ctl_name)
1685 return NULL;
1686
1687 /* table should contain subdirectory with the same name */
1688 for (p = table; p->procname || p->ctl_name; p++) {
1689 if (!p->child)
1690 continue;
1691 if (p->procname && strcmp(p->procname, s) == 0)
1692 return p;
1693 }
1694 return NULL;
1695 }
1696
1697 /* see if attaching q to p would be an improvement */
1698 static void try_attach(struct ctl_table_header *p, struct ctl_table_header *q)
1699 {
1700 struct ctl_table *to = p->ctl_table, *by = q->ctl_table;
1701 struct ctl_table *next;
1702 int is_better = 0;
1703 int not_in_parent = !p->attached_by;
1704
1705 while ((next = is_branch_in(by, to)) != NULL) {
1706 if (by == q->attached_by)
1707 is_better = 1;
1708 if (to == p->attached_by)
1709 not_in_parent = 1;
1710 by = by->child;
1711 to = next->child;
1712 }
1713
1714 if (is_better && not_in_parent) {
1715 q->attached_by = by;
1716 q->attached_to = to;
1717 q->parent = p;
1718 }
1719 }
1720
1721 /**
1722 * __register_sysctl_paths - register a sysctl hierarchy
1723 * @root: List of sysctl headers to register on
1724 * @namespaces: Data to compute which lists of sysctl entries are visible
1725 * @path: The path to the directory the sysctl table is in.
1726 * @table: the top-level table structure
1727 *
1728 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1729 * array. A completely 0 filled entry terminates the table.
1730 *
1731 * The members of the &struct ctl_table structure are used as follows:
1732 *
1733 * ctl_name - This is the numeric sysctl value used by sysctl(2). The number
1734 * must be unique within that level of sysctl
1735 *
1736 * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1737 * enter a sysctl file
1738 *
1739 * data - a pointer to data for use by proc_handler
1740 *
1741 * maxlen - the maximum size in bytes of the data
1742 *
1743 * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1744 *
1745 * child - a pointer to the child sysctl table if this entry is a directory, or
1746 * %NULL.
1747 *
1748 * proc_handler - the text handler routine (described below)
1749 *
1750 * strategy - the strategy routine (described below)
1751 *
1752 * de - for internal use by the sysctl routines
1753 *
1754 * extra1, extra2 - extra pointers usable by the proc handler routines
1755 *
1756 * Leaf nodes in the sysctl tree will be represented by a single file
1757 * under /proc; non-leaf nodes will be represented by directories.
1758 *
1759 * sysctl(2) can automatically manage read and write requests through
1760 * the sysctl table. The data and maxlen fields of the ctl_table
1761 * struct enable minimal validation of the values being written to be
1762 * performed, and the mode field allows minimal authentication.
1763 *
1764 * More sophisticated management can be enabled by the provision of a
1765 * strategy routine with the table entry. This will be called before
1766 * any automatic read or write of the data is performed.
1767 *
1768 * The strategy routine may return
1769 *
1770 * < 0 - Error occurred (error is passed to user process)
1771 *
1772 * 0 - OK - proceed with automatic read or write.
1773 *
1774 * > 0 - OK - read or write has been done by the strategy routine, so
1775 * return immediately.
1776 *
1777 * There must be a proc_handler routine for any terminal nodes
1778 * mirrored under /proc/sys (non-terminals are handled by a built-in
1779 * directory handler). Several default handlers are available to
1780 * cover common cases -
1781 *
1782 * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
1783 * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(),
1784 * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
1785 *
1786 * It is the handler's job to read the input buffer from user memory
1787 * and process it. The handler should return 0 on success.
1788 *
1789 * This routine returns %NULL on a failure to register, and a pointer
1790 * to the table header on success.
1791 */
1792 struct ctl_table_header *__register_sysctl_paths(
1793 struct ctl_table_root *root,
1794 struct nsproxy *namespaces,
1795 const struct ctl_path *path, struct ctl_table *table)
1796 {
1797 struct ctl_table_header *header;
1798 struct ctl_table *new, **prevp;
1799 unsigned int n, npath;
1800 struct ctl_table_set *set;
1801
1802 /* Count the path components */
1803 for (npath = 0; path[npath].ctl_name || path[npath].procname; ++npath)
1804 ;
1805
1806 /*
1807 * For each path component, allocate a 2-element ctl_table array.
1808 * The first array element will be filled with the sysctl entry
1809 * for this, the second will be the sentinel (ctl_name == 0).
1810 *
1811 * We allocate everything in one go so that we don't have to
1812 * worry about freeing additional memory in unregister_sysctl_table.
1813 */
1814 header = kzalloc(sizeof(struct ctl_table_header) +
1815 (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL);
1816 if (!header)
1817 return NULL;
1818
1819 new = (struct ctl_table *) (header + 1);
1820
1821 /* Now connect the dots */
1822 prevp = &header->ctl_table;
1823 for (n = 0; n < npath; ++n, ++path) {
1824 /* Copy the procname */
1825 new->procname = path->procname;
1826 new->ctl_name = path->ctl_name;
1827 new->mode = 0555;
1828
1829 *prevp = new;
1830 prevp = &new->child;
1831
1832 new += 2;
1833 }
1834 *prevp = table;
1835 header->ctl_table_arg = table;
1836
1837 INIT_LIST_HEAD(&header->ctl_entry);
1838 header->used = 0;
1839 header->unregistering = NULL;
1840 header->root = root;
1841 sysctl_set_parent(NULL, header->ctl_table);
1842 header->count = 1;
1843 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK
1844 if (sysctl_check_table(namespaces, header->ctl_table)) {
1845 kfree(header);
1846 return NULL;
1847 }
1848 #endif
1849 spin_lock(&sysctl_lock);
1850 header->set = lookup_header_set(root, namespaces);
1851 header->attached_by = header->ctl_table;
1852 header->attached_to = root_table;
1853 header->parent = &root_table_header;
1854 for (set = header->set; set; set = set->parent) {
1855 struct ctl_table_header *p;
1856 list_for_each_entry(p, &set->list, ctl_entry) {
1857 if (p->unregistering)
1858 continue;
1859 try_attach(p, header);
1860 }
1861 }
1862 header->parent->count++;
1863 list_add_tail(&header->ctl_entry, &header->set->list);
1864 spin_unlock(&sysctl_lock);
1865
1866 return header;
1867 }
1868
1869 /**
1870 * register_sysctl_table_path - register a sysctl table hierarchy
1871 * @path: The path to the directory the sysctl table is in.
1872 * @table: the top-level table structure
1873 *
1874 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1875 * array. A completely 0 filled entry terminates the table.
1876 *
1877 * See __register_sysctl_paths for more details.
1878 */
1879 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
1880 struct ctl_table *table)
1881 {
1882 return __register_sysctl_paths(&sysctl_table_root, current->nsproxy,
1883 path, table);
1884 }
1885
1886 /**
1887 * register_sysctl_table - register a sysctl table hierarchy
1888 * @table: the top-level table structure
1889 *
1890 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1891 * array. A completely 0 filled entry terminates the table.
1892 *
1893 * See register_sysctl_paths for more details.
1894 */
1895 struct ctl_table_header *register_sysctl_table(struct ctl_table *table)
1896 {
1897 static const struct ctl_path null_path[] = { {} };
1898
1899 return register_sysctl_paths(null_path, table);
1900 }
1901
1902 /**
1903 * unregister_sysctl_table - unregister a sysctl table hierarchy
1904 * @header: the header returned from register_sysctl_table
1905 *
1906 * Unregisters the sysctl table and all children. proc entries may not
1907 * actually be removed until they are no longer used by anyone.
1908 */
1909 void unregister_sysctl_table(struct ctl_table_header * header)
1910 {
1911 might_sleep();
1912
1913 if (header == NULL)
1914 return;
1915
1916 spin_lock(&sysctl_lock);
1917 start_unregistering(header);
1918 if (!--header->parent->count) {
1919 WARN_ON(1);
1920 kfree(header->parent);
1921 }
1922 if (!--header->count)
1923 kfree(header);
1924 spin_unlock(&sysctl_lock);
1925 }
1926
1927 int sysctl_is_seen(struct ctl_table_header *p)
1928 {
1929 struct ctl_table_set *set = p->set;
1930 int res;
1931 spin_lock(&sysctl_lock);
1932 if (p->unregistering)
1933 res = 0;
1934 else if (!set->is_seen)
1935 res = 1;
1936 else
1937 res = set->is_seen(set);
1938 spin_unlock(&sysctl_lock);
1939 return res;
1940 }
1941
1942 void setup_sysctl_set(struct ctl_table_set *p,
1943 struct ctl_table_set *parent,
1944 int (*is_seen)(struct ctl_table_set *))
1945 {
1946 INIT_LIST_HEAD(&p->list);
1947 p->parent = parent ? parent : &sysctl_table_root.default_set;
1948 p->is_seen = is_seen;
1949 }
1950
1951 #else /* !CONFIG_SYSCTL */
1952 struct ctl_table_header *register_sysctl_table(struct ctl_table * table)
1953 {
1954 return NULL;
1955 }
1956
1957 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
1958 struct ctl_table *table)
1959 {
1960 return NULL;
1961 }
1962
1963 void unregister_sysctl_table(struct ctl_table_header * table)
1964 {
1965 }
1966
1967 void setup_sysctl_set(struct ctl_table_set *p,
1968 struct ctl_table_set *parent,
1969 int (*is_seen)(struct ctl_table_set *))
1970 {
1971 }
1972
1973 void sysctl_head_put(struct ctl_table_header *head)
1974 {
1975 }
1976
1977 #endif /* CONFIG_SYSCTL */
1978
1979 /*
1980 * /proc/sys support
1981 */
1982
1983 #ifdef CONFIG_PROC_SYSCTL
1984
1985 static int _proc_do_string(void* data, int maxlen, int write,
1986 struct file *filp, void __user *buffer,
1987 size_t *lenp, loff_t *ppos)
1988 {
1989 size_t len;
1990 char __user *p;
1991 char c;
1992
1993 if (!data || !maxlen || !*lenp) {
1994 *lenp = 0;
1995 return 0;
1996 }
1997
1998 if (write) {
1999 len = 0;
2000 p = buffer;
2001 while (len < *lenp) {
2002 if (get_user(c, p++))
2003 return -EFAULT;
2004 if (c == 0 || c == '\n')
2005 break;
2006 len++;
2007 }
2008 if (len >= maxlen)
2009 len = maxlen-1;
2010 if(copy_from_user(data, buffer, len))
2011 return -EFAULT;
2012 ((char *) data)[len] = 0;
2013 *ppos += *lenp;
2014 } else {
2015 len = strlen(data);
2016 if (len > maxlen)
2017 len = maxlen;
2018
2019 if (*ppos > len) {
2020 *lenp = 0;
2021 return 0;
2022 }
2023
2024 data += *ppos;
2025 len -= *ppos;
2026
2027 if (len > *lenp)
2028 len = *lenp;
2029 if (len)
2030 if(copy_to_user(buffer, data, len))
2031 return -EFAULT;
2032 if (len < *lenp) {
2033 if(put_user('\n', ((char __user *) buffer) + len))
2034 return -EFAULT;
2035 len++;
2036 }
2037 *lenp = len;
2038 *ppos += len;
2039 }
2040 return 0;
2041 }
2042
2043 /**
2044 * proc_dostring - read a string sysctl
2045 * @table: the sysctl table
2046 * @write: %TRUE if this is a write to the sysctl file
2047 * @filp: the file structure
2048 * @buffer: the user buffer
2049 * @lenp: the size of the user buffer
2050 * @ppos: file position
2051 *
2052 * Reads/writes a string from/to the user buffer. If the kernel
2053 * buffer provided is not large enough to hold the string, the
2054 * string is truncated. The copied string is %NULL-terminated.
2055 * If the string is being read by the user process, it is copied
2056 * and a newline '\n' is added. It is truncated if the buffer is
2057 * not large enough.
2058 *
2059 * Returns 0 on success.
2060 */
2061 int proc_dostring(struct ctl_table *table, int write, struct file *filp,
2062 void __user *buffer, size_t *lenp, loff_t *ppos)
2063 {
2064 return _proc_do_string(table->data, table->maxlen, write, filp,
2065 buffer, lenp, ppos);
2066 }
2067
2068
2069 static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp,
2070 int *valp,
2071 int write, void *data)
2072 {
2073 if (write) {
2074 *valp = *negp ? -*lvalp : *lvalp;
2075 } else {
2076 int val = *valp;
2077 if (val < 0) {
2078 *negp = -1;
2079 *lvalp = (unsigned long)-val;
2080 } else {
2081 *negp = 0;
2082 *lvalp = (unsigned long)val;
2083 }
2084 }
2085 return 0;
2086 }
2087
2088 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
2089 int write, struct file *filp, void __user *buffer,
2090 size_t *lenp, loff_t *ppos,
2091 int (*conv)(int *negp, unsigned long *lvalp, int *valp,
2092 int write, void *data),
2093 void *data)
2094 {
2095 #define TMPBUFLEN 21
2096 int *i, vleft, first=1, neg, val;
2097 unsigned long lval;
2098 size_t left, len;
2099
2100 char buf[TMPBUFLEN], *p;
2101 char __user *s = buffer;
2102
2103 if (!tbl_data || !table->maxlen || !*lenp ||
2104 (*ppos && !write)) {
2105 *lenp = 0;
2106 return 0;
2107 }
2108
2109 i = (int *) tbl_data;
2110 vleft = table->maxlen / sizeof(*i);
2111 left = *lenp;
2112
2113 if (!conv)
2114 conv = do_proc_dointvec_conv;
2115
2116 for (; left && vleft--; i++, first=0) {
2117 if (write) {
2118 while (left) {
2119 char c;
2120 if (get_user(c, s))
2121 return -EFAULT;
2122 if (!isspace(c))
2123 break;
2124 left--;
2125 s++;
2126 }
2127 if (!left)
2128 break;
2129 neg = 0;
2130 len = left;
2131 if (len > sizeof(buf) - 1)
2132 len = sizeof(buf) - 1;
2133 if (copy_from_user(buf, s, len))
2134 return -EFAULT;
2135 buf[len] = 0;
2136 p = buf;
2137 if (*p == '-' && left > 1) {
2138 neg = 1;
2139 p++;
2140 }
2141 if (*p < '0' || *p > '9')
2142 break;
2143
2144 lval = simple_strtoul(p, &p, 0);
2145
2146 len = p-buf;
2147 if ((len < left) && *p && !isspace(*p))
2148 break;
2149 if (neg)
2150 val = -val;
2151 s += len;
2152 left -= len;
2153
2154 if (conv(&neg, &lval, i, 1, data))
2155 break;
2156 } else {
2157 p = buf;
2158 if (!first)
2159 *p++ = '\t';
2160
2161 if (conv(&neg, &lval, i, 0, data))
2162 break;
2163
2164 sprintf(p, "%s%lu", neg ? "-" : "", lval);
2165 len = strlen(buf);
2166 if (len > left)
2167 len = left;
2168 if(copy_to_user(s, buf, len))
2169 return -EFAULT;
2170 left -= len;
2171 s += len;
2172 }
2173 }
2174
2175 if (!write && !first && left) {
2176 if(put_user('\n', s))
2177 return -EFAULT;
2178 left--, s++;
2179 }
2180 if (write) {
2181 while (left) {
2182 char c;
2183 if (get_user(c, s++))
2184 return -EFAULT;
2185 if (!isspace(c))
2186 break;
2187 left--;
2188 }
2189 }
2190 if (write && first)
2191 return -EINVAL;
2192 *lenp -= left;
2193 *ppos += *lenp;
2194 return 0;
2195 #undef TMPBUFLEN
2196 }
2197
2198 static int do_proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2199 void __user *buffer, size_t *lenp, loff_t *ppos,
2200 int (*conv)(int *negp, unsigned long *lvalp, int *valp,
2201 int write, void *data),
2202 void *data)
2203 {
2204 return __do_proc_dointvec(table->data, table, write, filp,
2205 buffer, lenp, ppos, conv, data);
2206 }
2207
2208 /**
2209 * proc_dointvec - read a vector of integers
2210 * @table: the sysctl table
2211 * @write: %TRUE if this is a write to the sysctl file
2212 * @filp: the file structure
2213 * @buffer: the user buffer
2214 * @lenp: the size of the user buffer
2215 * @ppos: file position
2216 *
2217 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2218 * values from/to the user buffer, treated as an ASCII string.
2219 *
2220 * Returns 0 on success.
2221 */
2222 int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2223 void __user *buffer, size_t *lenp, loff_t *ppos)
2224 {
2225 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2226 NULL,NULL);
2227 }
2228
2229 /*
2230 * Taint values can only be increased
2231 * This means we can safely use a temporary.
2232 */
2233 static int proc_taint(struct ctl_table *table, int write, struct file *filp,
2234 void __user *buffer, size_t *lenp, loff_t *ppos)
2235 {
2236 struct ctl_table t;
2237 unsigned long tmptaint = get_taint();
2238 int err;
2239
2240 if (write && !capable(CAP_SYS_ADMIN))
2241 return -EPERM;
2242
2243 t = *table;
2244 t.data = &tmptaint;
2245 err = proc_doulongvec_minmax(&t, write, filp, buffer, lenp, ppos);
2246 if (err < 0)
2247 return err;
2248
2249 if (write) {
2250 /*
2251 * Poor man's atomic or. Not worth adding a primitive
2252 * to everyone's atomic.h for this
2253 */
2254 int i;
2255 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2256 if ((tmptaint >> i) & 1)
2257 add_taint(i);
2258 }
2259 }
2260
2261 return err;
2262 }
2263
2264 struct do_proc_dointvec_minmax_conv_param {
2265 int *min;
2266 int *max;
2267 };
2268
2269 static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp,
2270 int *valp,
2271 int write, void *data)
2272 {
2273 struct do_proc_dointvec_minmax_conv_param *param = data;
2274 if (write) {
2275 int val = *negp ? -*lvalp : *lvalp;
2276 if ((param->min && *param->min > val) ||
2277 (param->max && *param->max < val))
2278 return -EINVAL;
2279 *valp = val;
2280 } else {
2281 int val = *valp;
2282 if (val < 0) {
2283 *negp = -1;
2284 *lvalp = (unsigned long)-val;
2285 } else {
2286 *negp = 0;
2287 *lvalp = (unsigned long)val;
2288 }
2289 }
2290 return 0;
2291 }
2292
2293 /**
2294 * proc_dointvec_minmax - read a vector of integers with min/max values
2295 * @table: the sysctl table
2296 * @write: %TRUE if this is a write to the sysctl file
2297 * @filp: the file structure
2298 * @buffer: the user buffer
2299 * @lenp: the size of the user buffer
2300 * @ppos: file position
2301 *
2302 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2303 * values from/to the user buffer, treated as an ASCII string.
2304 *
2305 * This routine will ensure the values are within the range specified by
2306 * table->extra1 (min) and table->extra2 (max).
2307 *
2308 * Returns 0 on success.
2309 */
2310 int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
2311 void __user *buffer, size_t *lenp, loff_t *ppos)
2312 {
2313 struct do_proc_dointvec_minmax_conv_param param = {
2314 .min = (int *) table->extra1,
2315 .max = (int *) table->extra2,
2316 };
2317 return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2318 do_proc_dointvec_minmax_conv, &param);
2319 }
2320
2321 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2322 struct file *filp,
2323 void __user *buffer,
2324 size_t *lenp, loff_t *ppos,
2325 unsigned long convmul,
2326 unsigned long convdiv)
2327 {
2328 #define TMPBUFLEN 21
2329 unsigned long *i, *min, *max, val;
2330 int vleft, first=1, neg;
2331 size_t len, left;
2332 char buf[TMPBUFLEN], *p;
2333 char __user *s = buffer;
2334
2335 if (!data || !table->maxlen || !*lenp ||
2336 (*ppos && !write)) {
2337 *lenp = 0;
2338 return 0;
2339 }
2340
2341 i = (unsigned long *) data;
2342 min = (unsigned long *) table->extra1;
2343 max = (unsigned long *) table->extra2;
2344 vleft = table->maxlen / sizeof(unsigned long);
2345 left = *lenp;
2346
2347 for (; left && vleft--; i++, min++, max++, first=0) {
2348 if (write) {
2349 while (left) {
2350 char c;
2351 if (get_user(c, s))
2352 return -EFAULT;
2353 if (!isspace(c))
2354 break;
2355 left--;
2356 s++;
2357 }
2358 if (!left)
2359 break;
2360 neg = 0;
2361 len = left;
2362 if (len > TMPBUFLEN-1)
2363 len = TMPBUFLEN-1;
2364 if (copy_from_user(buf, s, len))
2365 return -EFAULT;
2366 buf[len] = 0;
2367 p = buf;
2368 if (*p == '-' && left > 1) {
2369 neg = 1;
2370 p++;
2371 }
2372 if (*p < '0' || *p > '9')
2373 break;
2374 val = simple_strtoul(p, &p, 0) * convmul / convdiv ;
2375 len = p-buf;
2376 if ((len < left) && *p && !isspace(*p))
2377 break;
2378 if (neg)
2379 val = -val;
2380 s += len;
2381 left -= len;
2382
2383 if(neg)
2384 continue;
2385 if ((min && val < *min) || (max && val > *max))
2386 continue;
2387 *i = val;
2388 } else {
2389 p = buf;
2390 if (!first)
2391 *p++ = '\t';
2392 sprintf(p, "%lu", convdiv * (*i) / convmul);
2393 len = strlen(buf);
2394 if (len > left)
2395 len = left;
2396 if(copy_to_user(s, buf, len))
2397 return -EFAULT;
2398 left -= len;
2399 s += len;
2400 }
2401 }
2402
2403 if (!write && !first && left) {
2404 if(put_user('\n', s))
2405 return -EFAULT;
2406 left--, s++;
2407 }
2408 if (write) {
2409 while (left) {
2410 char c;
2411 if (get_user(c, s++))
2412 return -EFAULT;
2413 if (!isspace(c))
2414 break;
2415 left--;
2416 }
2417 }
2418 if (write && first)
2419 return -EINVAL;
2420 *lenp -= left;
2421 *ppos += *lenp;
2422 return 0;
2423 #undef TMPBUFLEN
2424 }
2425
2426 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2427 struct file *filp,
2428 void __user *buffer,
2429 size_t *lenp, loff_t *ppos,
2430 unsigned long convmul,
2431 unsigned long convdiv)
2432 {
2433 return __do_proc_doulongvec_minmax(table->data, table, write,
2434 filp, buffer, lenp, ppos, convmul, convdiv);
2435 }
2436
2437 /**
2438 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2439 * @table: the sysctl table
2440 * @write: %TRUE if this is a write to the sysctl file
2441 * @filp: the file structure
2442 * @buffer: the user buffer
2443 * @lenp: the size of the user buffer
2444 * @ppos: file position
2445 *
2446 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2447 * values from/to the user buffer, treated as an ASCII string.
2448 *
2449 * This routine will ensure the values are within the range specified by
2450 * table->extra1 (min) and table->extra2 (max).
2451 *
2452 * Returns 0 on success.
2453 */
2454 int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
2455 void __user *buffer, size_t *lenp, loff_t *ppos)
2456 {
2457 return do_proc_doulongvec_minmax(table, write, filp, buffer, lenp, ppos, 1l, 1l);
2458 }
2459
2460 /**
2461 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2462 * @table: the sysctl table
2463 * @write: %TRUE if this is a write to the sysctl file
2464 * @filp: the file structure
2465 * @buffer: the user buffer
2466 * @lenp: the size of the user buffer
2467 * @ppos: file position
2468 *
2469 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2470 * values from/to the user buffer, treated as an ASCII string. The values
2471 * are treated as milliseconds, and converted to jiffies when they are stored.
2472 *
2473 * This routine will ensure the values are within the range specified by
2474 * table->extra1 (min) and table->extra2 (max).
2475 *
2476 * Returns 0 on success.
2477 */
2478 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2479 struct file *filp,
2480 void __user *buffer,
2481 size_t *lenp, loff_t *ppos)
2482 {
2483 return do_proc_doulongvec_minmax(table, write, filp, buffer,
2484 lenp, ppos, HZ, 1000l);
2485 }
2486
2487
2488 static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp,
2489 int *valp,
2490 int write, void *data)
2491 {
2492 if (write) {
2493 if (*lvalp > LONG_MAX / HZ)
2494 return 1;
2495 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2496 } else {
2497 int val = *valp;
2498 unsigned long lval;
2499 if (val < 0) {
2500 *negp = -1;
2501 lval = (unsigned long)-val;
2502 } else {
2503 *negp = 0;
2504 lval = (unsigned long)val;
2505 }
2506 *lvalp = lval / HZ;
2507 }
2508 return 0;
2509 }
2510
2511 static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp,
2512 int *valp,
2513 int write, void *data)
2514 {
2515 if (write) {
2516 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2517 return 1;
2518 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2519 } else {
2520 int val = *valp;
2521 unsigned long lval;
2522 if (val < 0) {
2523 *negp = -1;
2524 lval = (unsigned long)-val;
2525 } else {
2526 *negp = 0;
2527 lval = (unsigned long)val;
2528 }
2529 *lvalp = jiffies_to_clock_t(lval);
2530 }
2531 return 0;
2532 }
2533
2534 static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp,
2535 int *valp,
2536 int write, void *data)
2537 {
2538 if (write) {
2539 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2540 } else {
2541 int val = *valp;
2542 unsigned long lval;
2543 if (val < 0) {
2544 *negp = -1;
2545 lval = (unsigned long)-val;
2546 } else {
2547 *negp = 0;
2548 lval = (unsigned long)val;
2549 }
2550 *lvalp = jiffies_to_msecs(lval);
2551 }
2552 return 0;
2553 }
2554
2555 /**
2556 * proc_dointvec_jiffies - read a vector of integers as seconds
2557 * @table: the sysctl table
2558 * @write: %TRUE if this is a write to the sysctl file
2559 * @filp: the file structure
2560 * @buffer: the user buffer
2561 * @lenp: the size of the user buffer
2562 * @ppos: file position
2563 *
2564 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2565 * values from/to the user buffer, treated as an ASCII string.
2566 * The values read are assumed to be in seconds, and are converted into
2567 * jiffies.
2568 *
2569 * Returns 0 on success.
2570 */
2571 int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
2572 void __user *buffer, size_t *lenp, loff_t *ppos)
2573 {
2574 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2575 do_proc_dointvec_jiffies_conv,NULL);
2576 }
2577
2578 /**
2579 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2580 * @table: the sysctl table
2581 * @write: %TRUE if this is a write to the sysctl file
2582 * @filp: the file structure
2583 * @buffer: the user buffer
2584 * @lenp: the size of the user buffer
2585 * @ppos: pointer to the file position
2586 *
2587 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2588 * values from/to the user buffer, treated as an ASCII string.
2589 * The values read are assumed to be in 1/USER_HZ seconds, and
2590 * are converted into jiffies.
2591 *
2592 * Returns 0 on success.
2593 */
2594 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
2595 void __user *buffer, size_t *lenp, loff_t *ppos)
2596 {
2597 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2598 do_proc_dointvec_userhz_jiffies_conv,NULL);
2599 }
2600
2601 /**
2602 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2603 * @table: the sysctl table
2604 * @write: %TRUE if this is a write to the sysctl file
2605 * @filp: the file structure
2606 * @buffer: the user buffer
2607 * @lenp: the size of the user buffer
2608 * @ppos: file position
2609 * @ppos: the current position in the file
2610 *
2611 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2612 * values from/to the user buffer, treated as an ASCII string.
2613 * The values read are assumed to be in 1/1000 seconds, and
2614 * are converted into jiffies.
2615 *
2616 * Returns 0 on success.
2617 */
2618 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
2619 void __user *buffer, size_t *lenp, loff_t *ppos)
2620 {
2621 return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2622 do_proc_dointvec_ms_jiffies_conv, NULL);
2623 }
2624
2625 static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
2626 void __user *buffer, size_t *lenp, loff_t *ppos)
2627 {
2628 struct pid *new_pid;
2629 pid_t tmp;
2630 int r;
2631
2632 tmp = pid_vnr(cad_pid);
2633
2634 r = __do_proc_dointvec(&tmp, table, write, filp, buffer,
2635 lenp, ppos, NULL, NULL);
2636 if (r || !write)
2637 return r;
2638
2639 new_pid = find_get_pid(tmp);
2640 if (!new_pid)
2641 return -ESRCH;
2642
2643 put_pid(xchg(&cad_pid, new_pid));
2644 return 0;
2645 }
2646
2647 #else /* CONFIG_PROC_FS */
2648
2649 int proc_dostring(struct ctl_table *table, int write, struct file *filp,
2650 void __user *buffer, size_t *lenp, loff_t *ppos)
2651 {
2652 return -ENOSYS;
2653 }
2654
2655 int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2656 void __user *buffer, size_t *lenp, loff_t *ppos)
2657 {
2658 return -ENOSYS;
2659 }
2660
2661 int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
2662 void __user *buffer, size_t *lenp, loff_t *ppos)
2663 {
2664 return -ENOSYS;
2665 }
2666
2667 int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
2668 void __user *buffer, size_t *lenp, loff_t *ppos)
2669 {
2670 return -ENOSYS;
2671 }
2672
2673 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
2674 void __user *buffer, size_t *lenp, loff_t *ppos)
2675 {
2676 return -ENOSYS;
2677 }
2678
2679 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
2680 void __user *buffer, size_t *lenp, loff_t *ppos)
2681 {
2682 return -ENOSYS;
2683 }
2684
2685 int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
2686 void __user *buffer, size_t *lenp, loff_t *ppos)
2687 {
2688 return -ENOSYS;
2689 }
2690
2691 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2692 struct file *filp,
2693 void __user *buffer,
2694 size_t *lenp, loff_t *ppos)
2695 {
2696 return -ENOSYS;
2697 }
2698
2699
2700 #endif /* CONFIG_PROC_FS */
2701
2702
2703 #ifdef CONFIG_SYSCTL_SYSCALL
2704 /*
2705 * General sysctl support routines
2706 */
2707
2708 /* The generic sysctl data routine (used if no strategy routine supplied) */
2709 int sysctl_data(struct ctl_table *table,
2710 void __user *oldval, size_t __user *oldlenp,
2711 void __user *newval, size_t newlen)
2712 {
2713 size_t len;
2714
2715 /* Get out of I don't have a variable */
2716 if (!table->data || !table->maxlen)
2717 return -ENOTDIR;
2718
2719 if (oldval && oldlenp) {
2720 if (get_user(len, oldlenp))
2721 return -EFAULT;
2722 if (len) {
2723 if (len > table->maxlen)
2724 len = table->maxlen;
2725 if (copy_to_user(oldval, table->data, len))
2726 return -EFAULT;
2727 if (put_user(len, oldlenp))
2728 return -EFAULT;
2729 }
2730 }
2731
2732 if (newval && newlen) {
2733 if (newlen > table->maxlen)
2734 newlen = table->maxlen;
2735
2736 if (copy_from_user(table->data, newval, newlen))
2737 return -EFAULT;
2738 }
2739 return 1;
2740 }
2741
2742 /* The generic string strategy routine: */
2743 int sysctl_string(struct ctl_table *table,
2744 void __user *oldval, size_t __user *oldlenp,
2745 void __user *newval, size_t newlen)
2746 {
2747 if (!table->data || !table->maxlen)
2748 return -ENOTDIR;
2749
2750 if (oldval && oldlenp) {
2751 size_t bufsize;
2752 if (get_user(bufsize, oldlenp))
2753 return -EFAULT;
2754 if (bufsize) {
2755 size_t len = strlen(table->data), copied;
2756
2757 /* This shouldn't trigger for a well-formed sysctl */
2758 if (len > table->maxlen)
2759 len = table->maxlen;
2760
2761 /* Copy up to a max of bufsize-1 bytes of the string */
2762 copied = (len >= bufsize) ? bufsize - 1 : len;
2763
2764 if (copy_to_user(oldval, table->data, copied) ||
2765 put_user(0, (char __user *)(oldval + copied)))
2766 return -EFAULT;
2767 if (put_user(len, oldlenp))
2768 return -EFAULT;
2769 }
2770 }
2771 if (newval && newlen) {
2772 size_t len = newlen;
2773 if (len > table->maxlen)
2774 len = table->maxlen;
2775 if(copy_from_user(table->data, newval, len))
2776 return -EFAULT;
2777 if (len == table->maxlen)
2778 len--;
2779 ((char *) table->data)[len] = 0;
2780 }
2781 return 1;
2782 }
2783
2784 /*
2785 * This function makes sure that all of the integers in the vector
2786 * are between the minimum and maximum values given in the arrays
2787 * table->extra1 and table->extra2, respectively.
2788 */
2789 int sysctl_intvec(struct ctl_table *table,
2790 void __user *oldval, size_t __user *oldlenp,
2791 void __user *newval, size_t newlen)
2792 {
2793
2794 if (newval && newlen) {
2795 int __user *vec = (int __user *) newval;
2796 int *min = (int *) table->extra1;
2797 int *max = (int *) table->extra2;
2798 size_t length;
2799 int i;
2800
2801 if (newlen % sizeof(int) != 0)
2802 return -EINVAL;
2803
2804 if (!table->extra1 && !table->extra2)
2805 return 0;
2806
2807 if (newlen > table->maxlen)
2808 newlen = table->maxlen;
2809 length = newlen / sizeof(int);
2810
2811 for (i = 0; i < length; i++) {
2812 int value;
2813 if (get_user(value, vec + i))
2814 return -EFAULT;
2815 if (min && value < min[i])
2816 return -EINVAL;
2817 if (max && value > max[i])
2818 return -EINVAL;
2819 }
2820 }
2821 return 0;
2822 }
2823
2824 /* Strategy function to convert jiffies to seconds */
2825 int sysctl_jiffies(struct ctl_table *table,
2826 void __user *oldval, size_t __user *oldlenp,
2827 void __user *newval, size_t newlen)
2828 {
2829 if (oldval && oldlenp) {
2830 size_t olen;
2831
2832 if (get_user(olen, oldlenp))
2833 return -EFAULT;
2834 if (olen) {
2835 int val;
2836
2837 if (olen < sizeof(int))
2838 return -EINVAL;
2839
2840 val = *(int *)(table->data) / HZ;
2841 if (put_user(val, (int __user *)oldval))
2842 return -EFAULT;
2843 if (put_user(sizeof(int), oldlenp))
2844 return -EFAULT;
2845 }
2846 }
2847 if (newval && newlen) {
2848 int new;
2849 if (newlen != sizeof(int))
2850 return -EINVAL;
2851 if (get_user(new, (int __user *)newval))
2852 return -EFAULT;
2853 *(int *)(table->data) = new*HZ;
2854 }
2855 return 1;
2856 }
2857
2858 /* Strategy function to convert jiffies to seconds */
2859 int sysctl_ms_jiffies(struct ctl_table *table,
2860 void __user *oldval, size_t __user *oldlenp,
2861 void __user *newval, size_t newlen)
2862 {
2863 if (oldval && oldlenp) {
2864 size_t olen;
2865
2866 if (get_user(olen, oldlenp))
2867 return -EFAULT;
2868 if (olen) {
2869 int val;
2870
2871 if (olen < sizeof(int))
2872 return -EINVAL;
2873
2874 val = jiffies_to_msecs(*(int *)(table->data));
2875 if (put_user(val, (int __user *)oldval))
2876 return -EFAULT;
2877 if (put_user(sizeof(int), oldlenp))
2878 return -EFAULT;
2879 }
2880 }
2881 if (newval && newlen) {
2882 int new;
2883 if (newlen != sizeof(int))
2884 return -EINVAL;
2885 if (get_user(new, (int __user *)newval))
2886 return -EFAULT;
2887 *(int *)(table->data) = msecs_to_jiffies(new);
2888 }
2889 return 1;
2890 }
2891
2892
2893
2894 #else /* CONFIG_SYSCTL_SYSCALL */
2895
2896
2897 asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
2898 {
2899 struct __sysctl_args tmp;
2900 int error;
2901
2902 if (copy_from_user(&tmp, args, sizeof(tmp)))
2903 return -EFAULT;
2904
2905 error = deprecated_sysctl_warning(&tmp);
2906
2907 /* If no error reading the parameters then just -ENOSYS ... */
2908 if (!error)
2909 error = -ENOSYS;
2910
2911 return error;
2912 }
2913
2914 int sysctl_data(struct ctl_table *table,
2915 void __user *oldval, size_t __user *oldlenp,
2916 void __user *newval, size_t newlen)
2917 {
2918 return -ENOSYS;
2919 }
2920
2921 int sysctl_string(struct ctl_table *table,
2922 void __user *oldval, size_t __user *oldlenp,
2923 void __user *newval, size_t newlen)
2924 {
2925 return -ENOSYS;
2926 }
2927
2928 int sysctl_intvec(struct ctl_table *table,
2929 void __user *oldval, size_t __user *oldlenp,
2930 void __user *newval, size_t newlen)
2931 {
2932 return -ENOSYS;
2933 }
2934
2935 int sysctl_jiffies(struct ctl_table *table,
2936 void __user *oldval, size_t __user *oldlenp,
2937 void __user *newval, size_t newlen)
2938 {
2939 return -ENOSYS;
2940 }
2941
2942 int sysctl_ms_jiffies(struct ctl_table *table,
2943 void __user *oldval, size_t __user *oldlenp,
2944 void __user *newval, size_t newlen)
2945 {
2946 return -ENOSYS;
2947 }
2948
2949 #endif /* CONFIG_SYSCTL_SYSCALL */
2950
2951 static int deprecated_sysctl_warning(struct __sysctl_args *args)
2952 {
2953 static int msg_count;
2954 int name[CTL_MAXNAME];
2955 int i;
2956
2957 /* Check args->nlen. */
2958 if (args->nlen < 0 || args->nlen > CTL_MAXNAME)
2959 return -ENOTDIR;
2960
2961 /* Read in the sysctl name for better debug message logging */
2962 for (i = 0; i < args->nlen; i++)
2963 if (get_user(name[i], args->name + i))
2964 return -EFAULT;
2965
2966 /* Ignore accesses to kernel.version */
2967 if ((args->nlen == 2) && (name[0] == CTL_KERN) && (name[1] == KERN_VERSION))
2968 return 0;
2969
2970 if (msg_count < 5) {
2971 msg_count++;
2972 printk(KERN_INFO
2973 "warning: process `%s' used the deprecated sysctl "
2974 "system call with ", current->comm);
2975 for (i = 0; i < args->nlen; i++)
2976 printk("%d.", name[i]);
2977 printk("\n");
2978 }
2979 return 0;
2980 }
2981
2982 /*
2983 * No sense putting this after each symbol definition, twice,
2984 * exception granted :-)
2985 */
2986 EXPORT_SYMBOL(proc_dointvec);
2987 EXPORT_SYMBOL(proc_dointvec_jiffies);
2988 EXPORT_SYMBOL(proc_dointvec_minmax);
2989 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2990 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2991 EXPORT_SYMBOL(proc_dostring);
2992 EXPORT_SYMBOL(proc_doulongvec_minmax);
2993 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
2994 EXPORT_SYMBOL(register_sysctl_table);
2995 EXPORT_SYMBOL(register_sysctl_paths);
2996 EXPORT_SYMBOL(sysctl_intvec);
2997 EXPORT_SYMBOL(sysctl_jiffies);
2998 EXPORT_SYMBOL(sysctl_ms_jiffies);
2999 EXPORT_SYMBOL(sysctl_string);
3000 EXPORT_SYMBOL(sysctl_data);
3001 EXPORT_SYMBOL(unregister_sysctl_table);
Support for the Chinese Samsung S3C2440 based development boards