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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/signal.h> |
27 | #include <linux/proc_fs.h> |
28 | #include <linux/security.h> |
29 | #include <linux/ctype.h> |
30 | #include <linux/kmemcheck.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/ratelimit.h> |
40 | #include <linux/hugetlb.h> |
41 | #include <linux/initrd.h> |
42 | #include <linux/key.h> |
43 | #include <linux/times.h> |
44 | #include <linux/limits.h> |
45 | #include <linux/dcache.h> |
46 | #include <linux/syscalls.h> |
47 | #include <linux/vmstat.h> |
48 | #include <linux/nfs_fs.h> |
49 | #include <linux/acpi.h> |
50 | #include <linux/reboot.h> |
51 | #include <linux/ftrace.h> |
52 | #include <linux/slow-work.h> |
53 | #include <linux/perf_event.h> |
54 | #include <linux/kprobes.h> |
55 | |
56 | #include <asm/uaccess.h> |
57 | #include <asm/processor.h> |
58 | |
59 | #ifdef CONFIG_X86 |
60 | #include <asm/nmi.h> |
61 | #include <asm/stacktrace.h> |
62 | #include <asm/io.h> |
63 | #endif |
64 | #ifdef CONFIG_BSD_PROCESS_ACCT |
65 | #include <linux/acct.h> |
66 | #endif |
67 | #ifdef CONFIG_RT_MUTEXES |
68 | #include <linux/rtmutex.h> |
69 | #endif |
70 | #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT) |
71 | #include <linux/lockdep.h> |
72 | #endif |
73 | #ifdef CONFIG_CHR_DEV_SG |
74 | #include <scsi/sg.h> |
75 | #endif |
76 | |
77 | |
78 | #if defined(CONFIG_SYSCTL) |
79 | |
80 | /* External variables not in a header file. */ |
81 | extern int sysctl_overcommit_memory; |
82 | extern int sysctl_overcommit_ratio; |
83 | extern int sysctl_panic_on_oom; |
84 | extern int sysctl_oom_kill_allocating_task; |
85 | extern int sysctl_oom_dump_tasks; |
86 | extern int max_threads; |
87 | extern int core_uses_pid; |
88 | extern int suid_dumpable; |
89 | extern char core_pattern[]; |
90 | extern unsigned int core_pipe_limit; |
91 | extern int pid_max; |
92 | extern int min_free_kbytes; |
93 | extern int pid_max_min, pid_max_max; |
94 | extern int sysctl_drop_caches; |
95 | extern int percpu_pagelist_fraction; |
96 | extern int compat_log; |
97 | extern int latencytop_enabled; |
98 | extern int sysctl_nr_open_min, sysctl_nr_open_max; |
99 | #ifndef CONFIG_MMU |
100 | extern int sysctl_nr_trim_pages; |
101 | #endif |
102 | #ifdef CONFIG_BLOCK |
103 | extern int blk_iopoll_enabled; |
104 | #endif |
105 | |
106 | /* Constants used for minimum and maximum */ |
107 | #ifdef CONFIG_DETECT_SOFTLOCKUP |
108 | static int sixty = 60; |
109 | static int neg_one = -1; |
110 | #endif |
111 | |
112 | static int zero; |
113 | static int __maybe_unused one = 1; |
114 | static int __maybe_unused two = 2; |
115 | static unsigned long one_ul = 1; |
116 | static int one_hundred = 100; |
117 | #ifdef CONFIG_PRINTK |
118 | static int ten_thousand = 10000; |
119 | #endif |
120 | |
121 | /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */ |
122 | static unsigned long dirty_bytes_min = 2 * PAGE_SIZE; |
123 | |
124 | /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */ |
125 | static int maxolduid = 65535; |
126 | static int minolduid; |
127 | static int min_percpu_pagelist_fract = 8; |
128 | |
129 | static int ngroups_max = NGROUPS_MAX; |
130 | |
131 | #ifdef CONFIG_SPARC |
132 | #include <asm/system.h> |
133 | #endif |
134 | |
135 | #ifdef CONFIG_SPARC64 |
136 | extern int sysctl_tsb_ratio; |
137 | #endif |
138 | |
139 | #ifdef __hppa__ |
140 | extern int pwrsw_enabled; |
141 | extern int unaligned_enabled; |
142 | #endif |
143 | |
144 | #ifdef CONFIG_S390 |
145 | #ifdef CONFIG_MATHEMU |
146 | extern int sysctl_ieee_emulation_warnings; |
147 | #endif |
148 | extern int sysctl_userprocess_debug; |
149 | extern int spin_retry; |
150 | #endif |
151 | |
152 | #ifdef CONFIG_IA64 |
153 | extern int no_unaligned_warning; |
154 | extern int unaligned_dump_stack; |
155 | #endif |
156 | |
157 | extern struct ratelimit_state printk_ratelimit_state; |
158 | |
159 | #ifdef CONFIG_PROC_SYSCTL |
160 | static int proc_do_cad_pid(struct ctl_table *table, int write, |
161 | void __user *buffer, size_t *lenp, loff_t *ppos); |
162 | static int proc_taint(struct ctl_table *table, int write, |
163 | void __user *buffer, size_t *lenp, loff_t *ppos); |
164 | #endif |
165 | |
166 | static struct ctl_table root_table[]; |
167 | static struct ctl_table_root sysctl_table_root; |
168 | static struct ctl_table_header root_table_header = { |
169 | .count = 1, |
170 | .ctl_table = root_table, |
171 | .ctl_entry = LIST_HEAD_INIT(sysctl_table_root.default_set.list), |
172 | .root = &sysctl_table_root, |
173 | .set = &sysctl_table_root.default_set, |
174 | }; |
175 | static struct ctl_table_root sysctl_table_root = { |
176 | .root_list = LIST_HEAD_INIT(sysctl_table_root.root_list), |
177 | .default_set.list = LIST_HEAD_INIT(root_table_header.ctl_entry), |
178 | }; |
179 | |
180 | static struct ctl_table kern_table[]; |
181 | static struct ctl_table vm_table[]; |
182 | static struct ctl_table fs_table[]; |
183 | static struct ctl_table debug_table[]; |
184 | static struct ctl_table dev_table[]; |
185 | extern struct ctl_table random_table[]; |
186 | #ifdef CONFIG_INOTIFY_USER |
187 | extern struct ctl_table inotify_table[]; |
188 | #endif |
189 | #ifdef CONFIG_EPOLL |
190 | extern struct ctl_table epoll_table[]; |
191 | #endif |
192 | |
193 | #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT |
194 | int sysctl_legacy_va_layout; |
195 | #endif |
196 | |
197 | /* The default sysctl tables: */ |
198 | |
199 | static struct ctl_table root_table[] = { |
200 | { |
201 | .procname = "kernel", |
202 | .mode = 0555, |
203 | .child = kern_table, |
204 | }, |
205 | { |
206 | .procname = "vm", |
207 | .mode = 0555, |
208 | .child = vm_table, |
209 | }, |
210 | { |
211 | .procname = "fs", |
212 | .mode = 0555, |
213 | .child = fs_table, |
214 | }, |
215 | { |
216 | .procname = "debug", |
217 | .mode = 0555, |
218 | .child = debug_table, |
219 | }, |
220 | { |
221 | .procname = "dev", |
222 | .mode = 0555, |
223 | .child = dev_table, |
224 | }, |
225 | /* |
226 | * NOTE: do not add new entries to this table unless you have read |
227 | * Documentation/sysctl/ctl_unnumbered.txt |
228 | */ |
229 | { } |
230 | }; |
231 | |
232 | #ifdef CONFIG_SCHED_DEBUG |
233 | static int min_sched_granularity_ns = 100000; /* 100 usecs */ |
234 | static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */ |
235 | static int min_wakeup_granularity_ns; /* 0 usecs */ |
236 | static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */ |
237 | static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE; |
238 | static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1; |
239 | static int min_sched_shares_ratelimit = 100000; /* 100 usec */ |
240 | static int max_sched_shares_ratelimit = NSEC_PER_SEC; /* 1 second */ |
241 | #endif |
242 | |
243 | static struct ctl_table kern_table[] = { |
244 | { |
245 | .procname = "sched_child_runs_first", |
246 | .data = &sysctl_sched_child_runs_first, |
247 | .maxlen = sizeof(unsigned int), |
248 | .mode = 0644, |
249 | .proc_handler = proc_dointvec, |
250 | }, |
251 | #ifdef CONFIG_SCHED_DEBUG |
252 | { |
253 | .procname = "sched_min_granularity_ns", |
254 | .data = &sysctl_sched_min_granularity, |
255 | .maxlen = sizeof(unsigned int), |
256 | .mode = 0644, |
257 | .proc_handler = sched_proc_update_handler, |
258 | .extra1 = &min_sched_granularity_ns, |
259 | .extra2 = &max_sched_granularity_ns, |
260 | }, |
261 | { |
262 | .procname = "sched_latency_ns", |
263 | .data = &sysctl_sched_latency, |
264 | .maxlen = sizeof(unsigned int), |
265 | .mode = 0644, |
266 | .proc_handler = sched_proc_update_handler, |
267 | .extra1 = &min_sched_granularity_ns, |
268 | .extra2 = &max_sched_granularity_ns, |
269 | }, |
270 | { |
271 | .procname = "sched_wakeup_granularity_ns", |
272 | .data = &sysctl_sched_wakeup_granularity, |
273 | .maxlen = sizeof(unsigned int), |
274 | .mode = 0644, |
275 | .proc_handler = sched_proc_update_handler, |
276 | .extra1 = &min_wakeup_granularity_ns, |
277 | .extra2 = &max_wakeup_granularity_ns, |
278 | }, |
279 | { |
280 | .procname = "sched_shares_ratelimit", |
281 | .data = &sysctl_sched_shares_ratelimit, |
282 | .maxlen = sizeof(unsigned int), |
283 | .mode = 0644, |
284 | .proc_handler = sched_proc_update_handler, |
285 | .extra1 = &min_sched_shares_ratelimit, |
286 | .extra2 = &max_sched_shares_ratelimit, |
287 | }, |
288 | { |
289 | .procname = "sched_tunable_scaling", |
290 | .data = &sysctl_sched_tunable_scaling, |
291 | .maxlen = sizeof(enum sched_tunable_scaling), |
292 | .mode = 0644, |
293 | .proc_handler = sched_proc_update_handler, |
294 | .extra1 = &min_sched_tunable_scaling, |
295 | .extra2 = &max_sched_tunable_scaling, |
296 | }, |
297 | { |
298 | .procname = "sched_shares_thresh", |
299 | .data = &sysctl_sched_shares_thresh, |
300 | .maxlen = sizeof(unsigned int), |
301 | .mode = 0644, |
302 | .proc_handler = proc_dointvec_minmax, |
303 | .extra1 = &zero, |
304 | }, |
305 | { |
306 | .procname = "sched_migration_cost", |
307 | .data = &sysctl_sched_migration_cost, |
308 | .maxlen = sizeof(unsigned int), |
309 | .mode = 0644, |
310 | .proc_handler = proc_dointvec, |
311 | }, |
312 | { |
313 | .procname = "sched_nr_migrate", |
314 | .data = &sysctl_sched_nr_migrate, |
315 | .maxlen = sizeof(unsigned int), |
316 | .mode = 0644, |
317 | .proc_handler = proc_dointvec, |
318 | }, |
319 | { |
320 | .procname = "sched_time_avg", |
321 | .data = &sysctl_sched_time_avg, |
322 | .maxlen = sizeof(unsigned int), |
323 | .mode = 0644, |
324 | .proc_handler = proc_dointvec, |
325 | }, |
326 | { |
327 | .procname = "timer_migration", |
328 | .data = &sysctl_timer_migration, |
329 | .maxlen = sizeof(unsigned int), |
330 | .mode = 0644, |
331 | .proc_handler = proc_dointvec_minmax, |
332 | .extra1 = &zero, |
333 | .extra2 = &one, |
334 | }, |
335 | #endif |
336 | { |
337 | .procname = "sched_rt_period_us", |
338 | .data = &sysctl_sched_rt_period, |
339 | .maxlen = sizeof(unsigned int), |
340 | .mode = 0644, |
341 | .proc_handler = sched_rt_handler, |
342 | }, |
343 | { |
344 | .procname = "sched_rt_runtime_us", |
345 | .data = &sysctl_sched_rt_runtime, |
346 | .maxlen = sizeof(int), |
347 | .mode = 0644, |
348 | .proc_handler = sched_rt_handler, |
349 | }, |
350 | { |
351 | .procname = "sched_compat_yield", |
352 | .data = &sysctl_sched_compat_yield, |
353 | .maxlen = sizeof(unsigned int), |
354 | .mode = 0644, |
355 | .proc_handler = proc_dointvec, |
356 | }, |
357 | #ifdef CONFIG_PROVE_LOCKING |
358 | { |
359 | .procname = "prove_locking", |
360 | .data = &prove_locking, |
361 | .maxlen = sizeof(int), |
362 | .mode = 0644, |
363 | .proc_handler = proc_dointvec, |
364 | }, |
365 | #endif |
366 | #ifdef CONFIG_LOCK_STAT |
367 | { |
368 | .procname = "lock_stat", |
369 | .data = &lock_stat, |
370 | .maxlen = sizeof(int), |
371 | .mode = 0644, |
372 | .proc_handler = proc_dointvec, |
373 | }, |
374 | #endif |
375 | { |
376 | .procname = "panic", |
377 | .data = &panic_timeout, |
378 | .maxlen = sizeof(int), |
379 | .mode = 0644, |
380 | .proc_handler = proc_dointvec, |
381 | }, |
382 | { |
383 | .procname = "core_uses_pid", |
384 | .data = &core_uses_pid, |
385 | .maxlen = sizeof(int), |
386 | .mode = 0644, |
387 | .proc_handler = proc_dointvec, |
388 | }, |
389 | { |
390 | .procname = "core_pattern", |
391 | .data = core_pattern, |
392 | .maxlen = CORENAME_MAX_SIZE, |
393 | .mode = 0644, |
394 | .proc_handler = proc_dostring, |
395 | }, |
396 | { |
397 | .procname = "core_pipe_limit", |
398 | .data = &core_pipe_limit, |
399 | .maxlen = sizeof(unsigned int), |
400 | .mode = 0644, |
401 | .proc_handler = proc_dointvec, |
402 | }, |
403 | #ifdef CONFIG_PROC_SYSCTL |
404 | { |
405 | .procname = "tainted", |
406 | .maxlen = sizeof(long), |
407 | .mode = 0644, |
408 | .proc_handler = proc_taint, |
409 | }, |
410 | #endif |
411 | #ifdef CONFIG_LATENCYTOP |
412 | { |
413 | .procname = "latencytop", |
414 | .data = &latencytop_enabled, |
415 | .maxlen = sizeof(int), |
416 | .mode = 0644, |
417 | .proc_handler = proc_dointvec, |
418 | }, |
419 | #endif |
420 | #ifdef CONFIG_BLK_DEV_INITRD |
421 | { |
422 | .procname = "real-root-dev", |
423 | .data = &real_root_dev, |
424 | .maxlen = sizeof(int), |
425 | .mode = 0644, |
426 | .proc_handler = proc_dointvec, |
427 | }, |
428 | #endif |
429 | { |
430 | .procname = "print-fatal-signals", |
431 | .data = &print_fatal_signals, |
432 | .maxlen = sizeof(int), |
433 | .mode = 0644, |
434 | .proc_handler = proc_dointvec, |
435 | }, |
436 | #ifdef CONFIG_SPARC |
437 | { |
438 | .procname = "reboot-cmd", |
439 | .data = reboot_command, |
440 | .maxlen = 256, |
441 | .mode = 0644, |
442 | .proc_handler = proc_dostring, |
443 | }, |
444 | { |
445 | .procname = "stop-a", |
446 | .data = &stop_a_enabled, |
447 | .maxlen = sizeof (int), |
448 | .mode = 0644, |
449 | .proc_handler = proc_dointvec, |
450 | }, |
451 | { |
452 | .procname = "scons-poweroff", |
453 | .data = &scons_pwroff, |
454 | .maxlen = sizeof (int), |
455 | .mode = 0644, |
456 | .proc_handler = proc_dointvec, |
457 | }, |
458 | #endif |
459 | #ifdef CONFIG_SPARC64 |
460 | { |
461 | .procname = "tsb-ratio", |
462 | .data = &sysctl_tsb_ratio, |
463 | .maxlen = sizeof (int), |
464 | .mode = 0644, |
465 | .proc_handler = proc_dointvec, |
466 | }, |
467 | #endif |
468 | #ifdef __hppa__ |
469 | { |
470 | .procname = "soft-power", |
471 | .data = &pwrsw_enabled, |
472 | .maxlen = sizeof (int), |
473 | .mode = 0644, |
474 | .proc_handler = proc_dointvec, |
475 | }, |
476 | { |
477 | .procname = "unaligned-trap", |
478 | .data = &unaligned_enabled, |
479 | .maxlen = sizeof (int), |
480 | .mode = 0644, |
481 | .proc_handler = proc_dointvec, |
482 | }, |
483 | #endif |
484 | { |
485 | .procname = "ctrl-alt-del", |
486 | .data = &C_A_D, |
487 | .maxlen = sizeof(int), |
488 | .mode = 0644, |
489 | .proc_handler = proc_dointvec, |
490 | }, |
491 | #ifdef CONFIG_FUNCTION_TRACER |
492 | { |
493 | .procname = "ftrace_enabled", |
494 | .data = &ftrace_enabled, |
495 | .maxlen = sizeof(int), |
496 | .mode = 0644, |
497 | .proc_handler = ftrace_enable_sysctl, |
498 | }, |
499 | #endif |
500 | #ifdef CONFIG_STACK_TRACER |
501 | { |
502 | .procname = "stack_tracer_enabled", |
503 | .data = &stack_tracer_enabled, |
504 | .maxlen = sizeof(int), |
505 | .mode = 0644, |
506 | .proc_handler = stack_trace_sysctl, |
507 | }, |
508 | #endif |
509 | #ifdef CONFIG_TRACING |
510 | { |
511 | .procname = "ftrace_dump_on_oops", |
512 | .data = &ftrace_dump_on_oops, |
513 | .maxlen = sizeof(int), |
514 | .mode = 0644, |
515 | .proc_handler = proc_dointvec, |
516 | }, |
517 | #endif |
518 | #ifdef CONFIG_MODULES |
519 | { |
520 | .procname = "modprobe", |
521 | .data = &modprobe_path, |
522 | .maxlen = KMOD_PATH_LEN, |
523 | .mode = 0644, |
524 | .proc_handler = proc_dostring, |
525 | }, |
526 | { |
527 | .procname = "modules_disabled", |
528 | .data = &modules_disabled, |
529 | .maxlen = sizeof(int), |
530 | .mode = 0644, |
531 | /* only handle a transition from default "0" to "1" */ |
532 | .proc_handler = proc_dointvec_minmax, |
533 | .extra1 = &one, |
534 | .extra2 = &one, |
535 | }, |
536 | #endif |
537 | #if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET) |
538 | { |
539 | .procname = "hotplug", |
540 | .data = &uevent_helper, |
541 | .maxlen = UEVENT_HELPER_PATH_LEN, |
542 | .mode = 0644, |
543 | .proc_handler = proc_dostring, |
544 | }, |
545 | #endif |
546 | #ifdef CONFIG_CHR_DEV_SG |
547 | { |
548 | .procname = "sg-big-buff", |
549 | .data = &sg_big_buff, |
550 | .maxlen = sizeof (int), |
551 | .mode = 0444, |
552 | .proc_handler = proc_dointvec, |
553 | }, |
554 | #endif |
555 | #ifdef CONFIG_BSD_PROCESS_ACCT |
556 | { |
557 | .procname = "acct", |
558 | .data = &acct_parm, |
559 | .maxlen = 3*sizeof(int), |
560 | .mode = 0644, |
561 | .proc_handler = proc_dointvec, |
562 | }, |
563 | #endif |
564 | #ifdef CONFIG_MAGIC_SYSRQ |
565 | { |
566 | .procname = "sysrq", |
567 | .data = &__sysrq_enabled, |
568 | .maxlen = sizeof (int), |
569 | .mode = 0644, |
570 | .proc_handler = proc_dointvec, |
571 | }, |
572 | #endif |
573 | #ifdef CONFIG_PROC_SYSCTL |
574 | { |
575 | .procname = "cad_pid", |
576 | .data = NULL, |
577 | .maxlen = sizeof (int), |
578 | .mode = 0600, |
579 | .proc_handler = proc_do_cad_pid, |
580 | }, |
581 | #endif |
582 | { |
583 | .procname = "threads-max", |
584 | .data = &max_threads, |
585 | .maxlen = sizeof(int), |
586 | .mode = 0644, |
587 | .proc_handler = proc_dointvec, |
588 | }, |
589 | { |
590 | .procname = "random", |
591 | .mode = 0555, |
592 | .child = random_table, |
593 | }, |
594 | { |
595 | .procname = "overflowuid", |
596 | .data = &overflowuid, |
597 | .maxlen = sizeof(int), |
598 | .mode = 0644, |
599 | .proc_handler = proc_dointvec_minmax, |
600 | .extra1 = &minolduid, |
601 | .extra2 = &maxolduid, |
602 | }, |
603 | { |
604 | .procname = "overflowgid", |
605 | .data = &overflowgid, |
606 | .maxlen = sizeof(int), |
607 | .mode = 0644, |
608 | .proc_handler = proc_dointvec_minmax, |
609 | .extra1 = &minolduid, |
610 | .extra2 = &maxolduid, |
611 | }, |
612 | #ifdef CONFIG_S390 |
613 | #ifdef CONFIG_MATHEMU |
614 | { |
615 | .procname = "ieee_emulation_warnings", |
616 | .data = &sysctl_ieee_emulation_warnings, |
617 | .maxlen = sizeof(int), |
618 | .mode = 0644, |
619 | .proc_handler = proc_dointvec, |
620 | }, |
621 | #endif |
622 | { |
623 | .procname = "userprocess_debug", |
624 | .data = &sysctl_userprocess_debug, |
625 | .maxlen = sizeof(int), |
626 | .mode = 0644, |
627 | .proc_handler = proc_dointvec, |
628 | }, |
629 | #endif |
630 | { |
631 | .procname = "pid_max", |
632 | .data = &pid_max, |
633 | .maxlen = sizeof (int), |
634 | .mode = 0644, |
635 | .proc_handler = proc_dointvec_minmax, |
636 | .extra1 = &pid_max_min, |
637 | .extra2 = &pid_max_max, |
638 | }, |
639 | { |
640 | .procname = "panic_on_oops", |
641 | .data = &panic_on_oops, |
642 | .maxlen = sizeof(int), |
643 | .mode = 0644, |
644 | .proc_handler = proc_dointvec, |
645 | }, |
646 | #if defined CONFIG_PRINTK |
647 | { |
648 | .procname = "printk", |
649 | .data = &console_loglevel, |
650 | .maxlen = 4*sizeof(int), |
651 | .mode = 0644, |
652 | .proc_handler = proc_dointvec, |
653 | }, |
654 | { |
655 | .procname = "printk_ratelimit", |
656 | .data = &printk_ratelimit_state.interval, |
657 | .maxlen = sizeof(int), |
658 | .mode = 0644, |
659 | .proc_handler = proc_dointvec_jiffies, |
660 | }, |
661 | { |
662 | .procname = "printk_ratelimit_burst", |
663 | .data = &printk_ratelimit_state.burst, |
664 | .maxlen = sizeof(int), |
665 | .mode = 0644, |
666 | .proc_handler = proc_dointvec, |
667 | }, |
668 | { |
669 | .procname = "printk_delay", |
670 | .data = &printk_delay_msec, |
671 | .maxlen = sizeof(int), |
672 | .mode = 0644, |
673 | .proc_handler = proc_dointvec_minmax, |
674 | .extra1 = &zero, |
675 | .extra2 = &ten_thousand, |
676 | }, |
677 | #endif |
678 | { |
679 | .procname = "ngroups_max", |
680 | .data = &ngroups_max, |
681 | .maxlen = sizeof (int), |
682 | .mode = 0444, |
683 | .proc_handler = proc_dointvec, |
684 | }, |
685 | #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86) |
686 | { |
687 | .procname = "unknown_nmi_panic", |
688 | .data = &unknown_nmi_panic, |
689 | .maxlen = sizeof (int), |
690 | .mode = 0644, |
691 | .proc_handler = proc_dointvec, |
692 | }, |
693 | { |
694 | .procname = "nmi_watchdog", |
695 | .data = &nmi_watchdog_enabled, |
696 | .maxlen = sizeof (int), |
697 | .mode = 0644, |
698 | .proc_handler = proc_nmi_enabled, |
699 | }, |
700 | #endif |
701 | #if defined(CONFIG_X86) |
702 | { |
703 | .procname = "panic_on_unrecovered_nmi", |
704 | .data = &panic_on_unrecovered_nmi, |
705 | .maxlen = sizeof(int), |
706 | .mode = 0644, |
707 | .proc_handler = proc_dointvec, |
708 | }, |
709 | { |
710 | .procname = "panic_on_io_nmi", |
711 | .data = &panic_on_io_nmi, |
712 | .maxlen = sizeof(int), |
713 | .mode = 0644, |
714 | .proc_handler = proc_dointvec, |
715 | }, |
716 | { |
717 | .procname = "bootloader_type", |
718 | .data = &bootloader_type, |
719 | .maxlen = sizeof (int), |
720 | .mode = 0444, |
721 | .proc_handler = proc_dointvec, |
722 | }, |
723 | { |
724 | .procname = "bootloader_version", |
725 | .data = &bootloader_version, |
726 | .maxlen = sizeof (int), |
727 | .mode = 0444, |
728 | .proc_handler = proc_dointvec, |
729 | }, |
730 | { |
731 | .procname = "kstack_depth_to_print", |
732 | .data = &kstack_depth_to_print, |
733 | .maxlen = sizeof(int), |
734 | .mode = 0644, |
735 | .proc_handler = proc_dointvec, |
736 | }, |
737 | { |
738 | .procname = "io_delay_type", |
739 | .data = &io_delay_type, |
740 | .maxlen = sizeof(int), |
741 | .mode = 0644, |
742 | .proc_handler = proc_dointvec, |
743 | }, |
744 | #endif |
745 | #if defined(CONFIG_MMU) |
746 | { |
747 | .procname = "randomize_va_space", |
748 | .data = &randomize_va_space, |
749 | .maxlen = sizeof(int), |
750 | .mode = 0644, |
751 | .proc_handler = proc_dointvec, |
752 | }, |
753 | #endif |
754 | #if defined(CONFIG_S390) && defined(CONFIG_SMP) |
755 | { |
756 | .procname = "spin_retry", |
757 | .data = &spin_retry, |
758 | .maxlen = sizeof (int), |
759 | .mode = 0644, |
760 | .proc_handler = proc_dointvec, |
761 | }, |
762 | #endif |
763 | #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86) |
764 | { |
765 | .procname = "acpi_video_flags", |
766 | .data = &acpi_realmode_flags, |
767 | .maxlen = sizeof (unsigned long), |
768 | .mode = 0644, |
769 | .proc_handler = proc_doulongvec_minmax, |
770 | }, |
771 | #endif |
772 | #ifdef CONFIG_IA64 |
773 | { |
774 | .procname = "ignore-unaligned-usertrap", |
775 | .data = &no_unaligned_warning, |
776 | .maxlen = sizeof (int), |
777 | .mode = 0644, |
778 | .proc_handler = proc_dointvec, |
779 | }, |
780 | { |
781 | .procname = "unaligned-dump-stack", |
782 | .data = &unaligned_dump_stack, |
783 | .maxlen = sizeof (int), |
784 | .mode = 0644, |
785 | .proc_handler = proc_dointvec, |
786 | }, |
787 | #endif |
788 | #ifdef CONFIG_DETECT_SOFTLOCKUP |
789 | { |
790 | .procname = "softlockup_panic", |
791 | .data = &softlockup_panic, |
792 | .maxlen = sizeof(int), |
793 | .mode = 0644, |
794 | .proc_handler = proc_dointvec_minmax, |
795 | .extra1 = &zero, |
796 | .extra2 = &one, |
797 | }, |
798 | { |
799 | .procname = "softlockup_thresh", |
800 | .data = &softlockup_thresh, |
801 | .maxlen = sizeof(int), |
802 | .mode = 0644, |
803 | .proc_handler = proc_dosoftlockup_thresh, |
804 | .extra1 = &neg_one, |
805 | .extra2 = &sixty, |
806 | }, |
807 | #endif |
808 | #ifdef CONFIG_DETECT_HUNG_TASK |
809 | { |
810 | .procname = "hung_task_panic", |
811 | .data = &sysctl_hung_task_panic, |
812 | .maxlen = sizeof(int), |
813 | .mode = 0644, |
814 | .proc_handler = proc_dointvec_minmax, |
815 | .extra1 = &zero, |
816 | .extra2 = &one, |
817 | }, |
818 | { |
819 | .procname = "hung_task_check_count", |
820 | .data = &sysctl_hung_task_check_count, |
821 | .maxlen = sizeof(unsigned long), |
822 | .mode = 0644, |
823 | .proc_handler = proc_doulongvec_minmax, |
824 | }, |
825 | { |
826 | .procname = "hung_task_timeout_secs", |
827 | .data = &sysctl_hung_task_timeout_secs, |
828 | .maxlen = sizeof(unsigned long), |
829 | .mode = 0644, |
830 | .proc_handler = proc_dohung_task_timeout_secs, |
831 | }, |
832 | { |
833 | .procname = "hung_task_warnings", |
834 | .data = &sysctl_hung_task_warnings, |
835 | .maxlen = sizeof(unsigned long), |
836 | .mode = 0644, |
837 | .proc_handler = proc_doulongvec_minmax, |
838 | }, |
839 | #endif |
840 | #ifdef CONFIG_COMPAT |
841 | { |
842 | .procname = "compat-log", |
843 | .data = &compat_log, |
844 | .maxlen = sizeof (int), |
845 | .mode = 0644, |
846 | .proc_handler = proc_dointvec, |
847 | }, |
848 | #endif |
849 | #ifdef CONFIG_RT_MUTEXES |
850 | { |
851 | .procname = "max_lock_depth", |
852 | .data = &max_lock_depth, |
853 | .maxlen = sizeof(int), |
854 | .mode = 0644, |
855 | .proc_handler = proc_dointvec, |
856 | }, |
857 | #endif |
858 | { |
859 | .procname = "poweroff_cmd", |
860 | .data = &poweroff_cmd, |
861 | .maxlen = POWEROFF_CMD_PATH_LEN, |
862 | .mode = 0644, |
863 | .proc_handler = proc_dostring, |
864 | }, |
865 | #ifdef CONFIG_KEYS |
866 | { |
867 | .procname = "keys", |
868 | .mode = 0555, |
869 | .child = key_sysctls, |
870 | }, |
871 | #endif |
872 | #ifdef CONFIG_RCU_TORTURE_TEST |
873 | { |
874 | .procname = "rcutorture_runnable", |
875 | .data = &rcutorture_runnable, |
876 | .maxlen = sizeof(int), |
877 | .mode = 0644, |
878 | .proc_handler = proc_dointvec, |
879 | }, |
880 | #endif |
881 | #ifdef CONFIG_SLOW_WORK |
882 | { |
883 | .procname = "slow-work", |
884 | .mode = 0555, |
885 | .child = slow_work_sysctls, |
886 | }, |
887 | #endif |
888 | #ifdef CONFIG_PERF_EVENTS |
889 | { |
890 | .procname = "perf_event_paranoid", |
891 | .data = &sysctl_perf_event_paranoid, |
892 | .maxlen = sizeof(sysctl_perf_event_paranoid), |
893 | .mode = 0644, |
894 | .proc_handler = proc_dointvec, |
895 | }, |
896 | { |
897 | .procname = "perf_event_mlock_kb", |
898 | .data = &sysctl_perf_event_mlock, |
899 | .maxlen = sizeof(sysctl_perf_event_mlock), |
900 | .mode = 0644, |
901 | .proc_handler = proc_dointvec, |
902 | }, |
903 | { |
904 | .procname = "perf_event_max_sample_rate", |
905 | .data = &sysctl_perf_event_sample_rate, |
906 | .maxlen = sizeof(sysctl_perf_event_sample_rate), |
907 | .mode = 0644, |
908 | .proc_handler = proc_dointvec, |
909 | }, |
910 | #endif |
911 | #ifdef CONFIG_KMEMCHECK |
912 | { |
913 | .procname = "kmemcheck", |
914 | .data = &kmemcheck_enabled, |
915 | .maxlen = sizeof(int), |
916 | .mode = 0644, |
917 | .proc_handler = proc_dointvec, |
918 | }, |
919 | #endif |
920 | #ifdef CONFIG_BLOCK |
921 | { |
922 | .procname = "blk_iopoll", |
923 | .data = &blk_iopoll_enabled, |
924 | .maxlen = sizeof(int), |
925 | .mode = 0644, |
926 | .proc_handler = proc_dointvec, |
927 | }, |
928 | #endif |
929 | /* |
930 | * NOTE: do not add new entries to this table unless you have read |
931 | * Documentation/sysctl/ctl_unnumbered.txt |
932 | */ |
933 | { } |
934 | }; |
935 | |
936 | static struct ctl_table vm_table[] = { |
937 | { |
938 | .procname = "overcommit_memory", |
939 | .data = &sysctl_overcommit_memory, |
940 | .maxlen = sizeof(sysctl_overcommit_memory), |
941 | .mode = 0644, |
942 | .proc_handler = proc_dointvec, |
943 | }, |
944 | { |
945 | .procname = "panic_on_oom", |
946 | .data = &sysctl_panic_on_oom, |
947 | .maxlen = sizeof(sysctl_panic_on_oom), |
948 | .mode = 0644, |
949 | .proc_handler = proc_dointvec, |
950 | }, |
951 | { |
952 | .procname = "oom_kill_allocating_task", |
953 | .data = &sysctl_oom_kill_allocating_task, |
954 | .maxlen = sizeof(sysctl_oom_kill_allocating_task), |
955 | .mode = 0644, |
956 | .proc_handler = proc_dointvec, |
957 | }, |
958 | { |
959 | .procname = "oom_dump_tasks", |
960 | .data = &sysctl_oom_dump_tasks, |
961 | .maxlen = sizeof(sysctl_oom_dump_tasks), |
962 | .mode = 0644, |
963 | .proc_handler = proc_dointvec, |
964 | }, |
965 | { |
966 | .procname = "overcommit_ratio", |
967 | .data = &sysctl_overcommit_ratio, |
968 | .maxlen = sizeof(sysctl_overcommit_ratio), |
969 | .mode = 0644, |
970 | .proc_handler = proc_dointvec, |
971 | }, |
972 | { |
973 | .procname = "page-cluster", |
974 | .data = &page_cluster, |
975 | .maxlen = sizeof(int), |
976 | .mode = 0644, |
977 | .proc_handler = proc_dointvec, |
978 | }, |
979 | { |
980 | .procname = "dirty_background_ratio", |
981 | .data = &dirty_background_ratio, |
982 | .maxlen = sizeof(dirty_background_ratio), |
983 | .mode = 0644, |
984 | .proc_handler = dirty_background_ratio_handler, |
985 | .extra1 = &zero, |
986 | .extra2 = &one_hundred, |
987 | }, |
988 | { |
989 | .procname = "dirty_background_bytes", |
990 | .data = &dirty_background_bytes, |
991 | .maxlen = sizeof(dirty_background_bytes), |
992 | .mode = 0644, |
993 | .proc_handler = dirty_background_bytes_handler, |
994 | .extra1 = &one_ul, |
995 | }, |
996 | { |
997 | .procname = "dirty_ratio", |
998 | .data = &vm_dirty_ratio, |
999 | .maxlen = sizeof(vm_dirty_ratio), |
1000 | .mode = 0644, |
1001 | .proc_handler = dirty_ratio_handler, |
1002 | .extra1 = &zero, |
1003 | .extra2 = &one_hundred, |
1004 | }, |
1005 | { |
1006 | .procname = "dirty_bytes", |
1007 | .data = &vm_dirty_bytes, |
1008 | .maxlen = sizeof(vm_dirty_bytes), |
1009 | .mode = 0644, |
1010 | .proc_handler = dirty_bytes_handler, |
1011 | .extra1 = &dirty_bytes_min, |
1012 | }, |
1013 | { |
1014 | .procname = "dirty_writeback_centisecs", |
1015 | .data = &dirty_writeback_interval, |
1016 | .maxlen = sizeof(dirty_writeback_interval), |
1017 | .mode = 0644, |
1018 | .proc_handler = dirty_writeback_centisecs_handler, |
1019 | }, |
1020 | { |
1021 | .procname = "dirty_expire_centisecs", |
1022 | .data = &dirty_expire_interval, |
1023 | .maxlen = sizeof(dirty_expire_interval), |
1024 | .mode = 0644, |
1025 | .proc_handler = proc_dointvec, |
1026 | }, |
1027 | { |
1028 | .procname = "nr_pdflush_threads", |
1029 | .data = &nr_pdflush_threads, |
1030 | .maxlen = sizeof nr_pdflush_threads, |
1031 | .mode = 0444 /* read-only*/, |
1032 | .proc_handler = proc_dointvec, |
1033 | }, |
1034 | { |
1035 | .procname = "swappiness", |
1036 | .data = &vm_swappiness, |
1037 | .maxlen = sizeof(vm_swappiness), |
1038 | .mode = 0644, |
1039 | .proc_handler = proc_dointvec_minmax, |
1040 | .extra1 = &zero, |
1041 | .extra2 = &one_hundred, |
1042 | }, |
1043 | #ifdef CONFIG_HUGETLB_PAGE |
1044 | { |
1045 | .procname = "nr_hugepages", |
1046 | .data = NULL, |
1047 | .maxlen = sizeof(unsigned long), |
1048 | .mode = 0644, |
1049 | .proc_handler = hugetlb_sysctl_handler, |
1050 | .extra1 = (void *)&hugetlb_zero, |
1051 | .extra2 = (void *)&hugetlb_infinity, |
1052 | }, |
1053 | #ifdef CONFIG_NUMA |
1054 | { |
1055 | .procname = "nr_hugepages_mempolicy", |
1056 | .data = NULL, |
1057 | .maxlen = sizeof(unsigned long), |
1058 | .mode = 0644, |
1059 | .proc_handler = &hugetlb_mempolicy_sysctl_handler, |
1060 | .extra1 = (void *)&hugetlb_zero, |
1061 | .extra2 = (void *)&hugetlb_infinity, |
1062 | }, |
1063 | #endif |
1064 | { |
1065 | .procname = "hugetlb_shm_group", |
1066 | .data = &sysctl_hugetlb_shm_group, |
1067 | .maxlen = sizeof(gid_t), |
1068 | .mode = 0644, |
1069 | .proc_handler = proc_dointvec, |
1070 | }, |
1071 | { |
1072 | .procname = "hugepages_treat_as_movable", |
1073 | .data = &hugepages_treat_as_movable, |
1074 | .maxlen = sizeof(int), |
1075 | .mode = 0644, |
1076 | .proc_handler = hugetlb_treat_movable_handler, |
1077 | }, |
1078 | { |
1079 | .procname = "nr_overcommit_hugepages", |
1080 | .data = NULL, |
1081 | .maxlen = sizeof(unsigned long), |
1082 | .mode = 0644, |
1083 | .proc_handler = hugetlb_overcommit_handler, |
1084 | .extra1 = (void *)&hugetlb_zero, |
1085 | .extra2 = (void *)&hugetlb_infinity, |
1086 | }, |
1087 | #endif |
1088 | { |
1089 | .procname = "lowmem_reserve_ratio", |
1090 | .data = &sysctl_lowmem_reserve_ratio, |
1091 | .maxlen = sizeof(sysctl_lowmem_reserve_ratio), |
1092 | .mode = 0644, |
1093 | .proc_handler = lowmem_reserve_ratio_sysctl_handler, |
1094 | }, |
1095 | { |
1096 | .procname = "drop_caches", |
1097 | .data = &sysctl_drop_caches, |
1098 | .maxlen = sizeof(int), |
1099 | .mode = 0644, |
1100 | .proc_handler = drop_caches_sysctl_handler, |
1101 | }, |
1102 | { |
1103 | .procname = "min_free_kbytes", |
1104 | .data = &min_free_kbytes, |
1105 | .maxlen = sizeof(min_free_kbytes), |
1106 | .mode = 0644, |
1107 | .proc_handler = min_free_kbytes_sysctl_handler, |
1108 | .extra1 = &zero, |
1109 | }, |
1110 | { |
1111 | .procname = "percpu_pagelist_fraction", |
1112 | .data = &percpu_pagelist_fraction, |
1113 | .maxlen = sizeof(percpu_pagelist_fraction), |
1114 | .mode = 0644, |
1115 | .proc_handler = percpu_pagelist_fraction_sysctl_handler, |
1116 | .extra1 = &min_percpu_pagelist_fract, |
1117 | }, |
1118 | #ifdef CONFIG_MMU |
1119 | { |
1120 | .procname = "max_map_count", |
1121 | .data = &sysctl_max_map_count, |
1122 | .maxlen = sizeof(sysctl_max_map_count), |
1123 | .mode = 0644, |
1124 | .proc_handler = proc_dointvec_minmax, |
1125 | .extra1 = &zero, |
1126 | }, |
1127 | #else |
1128 | { |
1129 | .procname = "nr_trim_pages", |
1130 | .data = &sysctl_nr_trim_pages, |
1131 | .maxlen = sizeof(sysctl_nr_trim_pages), |
1132 | .mode = 0644, |
1133 | .proc_handler = proc_dointvec_minmax, |
1134 | .extra1 = &zero, |
1135 | }, |
1136 | #endif |
1137 | { |
1138 | .procname = "laptop_mode", |
1139 | .data = &laptop_mode, |
1140 | .maxlen = sizeof(laptop_mode), |
1141 | .mode = 0644, |
1142 | .proc_handler = proc_dointvec_jiffies, |
1143 | }, |
1144 | { |
1145 | .procname = "block_dump", |
1146 | .data = &block_dump, |
1147 | .maxlen = sizeof(block_dump), |
1148 | .mode = 0644, |
1149 | .proc_handler = proc_dointvec, |
1150 | .extra1 = &zero, |
1151 | }, |
1152 | { |
1153 | .procname = "vfs_cache_pressure", |
1154 | .data = &sysctl_vfs_cache_pressure, |
1155 | .maxlen = sizeof(sysctl_vfs_cache_pressure), |
1156 | .mode = 0644, |
1157 | .proc_handler = proc_dointvec, |
1158 | .extra1 = &zero, |
1159 | }, |
1160 | #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT |
1161 | { |
1162 | .procname = "legacy_va_layout", |
1163 | .data = &sysctl_legacy_va_layout, |
1164 | .maxlen = sizeof(sysctl_legacy_va_layout), |
1165 | .mode = 0644, |
1166 | .proc_handler = proc_dointvec, |
1167 | .extra1 = &zero, |
1168 | }, |
1169 | #endif |
1170 | #ifdef CONFIG_NUMA |
1171 | { |
1172 | .procname = "zone_reclaim_mode", |
1173 | .data = &zone_reclaim_mode, |
1174 | .maxlen = sizeof(zone_reclaim_mode), |
1175 | .mode = 0644, |
1176 | .proc_handler = proc_dointvec, |
1177 | .extra1 = &zero, |
1178 | }, |
1179 | { |
1180 | .procname = "min_unmapped_ratio", |
1181 | .data = &sysctl_min_unmapped_ratio, |
1182 | .maxlen = sizeof(sysctl_min_unmapped_ratio), |
1183 | .mode = 0644, |
1184 | .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler, |
1185 | .extra1 = &zero, |
1186 | .extra2 = &one_hundred, |
1187 | }, |
1188 | { |
1189 | .procname = "min_slab_ratio", |
1190 | .data = &sysctl_min_slab_ratio, |
1191 | .maxlen = sizeof(sysctl_min_slab_ratio), |
1192 | .mode = 0644, |
1193 | .proc_handler = sysctl_min_slab_ratio_sysctl_handler, |
1194 | .extra1 = &zero, |
1195 | .extra2 = &one_hundred, |
1196 | }, |
1197 | #endif |
1198 | #ifdef CONFIG_SMP |
1199 | { |
1200 | .procname = "stat_interval", |
1201 | .data = &sysctl_stat_interval, |
1202 | .maxlen = sizeof(sysctl_stat_interval), |
1203 | .mode = 0644, |
1204 | .proc_handler = proc_dointvec_jiffies, |
1205 | }, |
1206 | #endif |
1207 | #ifdef CONFIG_MMU |
1208 | { |
1209 | .procname = "mmap_min_addr", |
1210 | .data = &dac_mmap_min_addr, |
1211 | .maxlen = sizeof(unsigned long), |
1212 | .mode = 0644, |
1213 | .proc_handler = mmap_min_addr_handler, |
1214 | }, |
1215 | #endif |
1216 | #ifdef CONFIG_NUMA |
1217 | { |
1218 | .procname = "numa_zonelist_order", |
1219 | .data = &numa_zonelist_order, |
1220 | .maxlen = NUMA_ZONELIST_ORDER_LEN, |
1221 | .mode = 0644, |
1222 | .proc_handler = numa_zonelist_order_handler, |
1223 | }, |
1224 | #endif |
1225 | #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \ |
1226 | (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL)) |
1227 | { |
1228 | .procname = "vdso_enabled", |
1229 | .data = &vdso_enabled, |
1230 | .maxlen = sizeof(vdso_enabled), |
1231 | .mode = 0644, |
1232 | .proc_handler = proc_dointvec, |
1233 | .extra1 = &zero, |
1234 | }, |
1235 | #endif |
1236 | #ifdef CONFIG_HIGHMEM |
1237 | { |
1238 | .procname = "highmem_is_dirtyable", |
1239 | .data = &vm_highmem_is_dirtyable, |
1240 | .maxlen = sizeof(vm_highmem_is_dirtyable), |
1241 | .mode = 0644, |
1242 | .proc_handler = proc_dointvec_minmax, |
1243 | .extra1 = &zero, |
1244 | .extra2 = &one, |
1245 | }, |
1246 | #endif |
1247 | { |
1248 | .procname = "scan_unevictable_pages", |
1249 | .data = &scan_unevictable_pages, |
1250 | .maxlen = sizeof(scan_unevictable_pages), |
1251 | .mode = 0644, |
1252 | .proc_handler = scan_unevictable_handler, |
1253 | }, |
1254 | #ifdef CONFIG_MEMORY_FAILURE |
1255 | { |
1256 | .procname = "memory_failure_early_kill", |
1257 | .data = &sysctl_memory_failure_early_kill, |
1258 | .maxlen = sizeof(sysctl_memory_failure_early_kill), |
1259 | .mode = 0644, |
1260 | .proc_handler = proc_dointvec_minmax, |
1261 | .extra1 = &zero, |
1262 | .extra2 = &one, |
1263 | }, |
1264 | { |
1265 | .procname = "memory_failure_recovery", |
1266 | .data = &sysctl_memory_failure_recovery, |
1267 | .maxlen = sizeof(sysctl_memory_failure_recovery), |
1268 | .mode = 0644, |
1269 | .proc_handler = proc_dointvec_minmax, |
1270 | .extra1 = &zero, |
1271 | .extra2 = &one, |
1272 | }, |
1273 | #endif |
1274 | |
1275 | /* |
1276 | * NOTE: do not add new entries to this table unless you have read |
1277 | * Documentation/sysctl/ctl_unnumbered.txt |
1278 | */ |
1279 | { } |
1280 | }; |
1281 | |
1282 | #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) |
1283 | static struct ctl_table binfmt_misc_table[] = { |
1284 | { } |
1285 | }; |
1286 | #endif |
1287 | |
1288 | static struct ctl_table fs_table[] = { |
1289 | { |
1290 | .procname = "inode-nr", |
1291 | .data = &inodes_stat, |
1292 | .maxlen = 2*sizeof(int), |
1293 | .mode = 0444, |
1294 | .proc_handler = proc_dointvec, |
1295 | }, |
1296 | { |
1297 | .procname = "inode-state", |
1298 | .data = &inodes_stat, |
1299 | .maxlen = 7*sizeof(int), |
1300 | .mode = 0444, |
1301 | .proc_handler = proc_dointvec, |
1302 | }, |
1303 | { |
1304 | .procname = "file-nr", |
1305 | .data = &files_stat, |
1306 | .maxlen = 3*sizeof(int), |
1307 | .mode = 0444, |
1308 | .proc_handler = proc_nr_files, |
1309 | }, |
1310 | { |
1311 | .procname = "file-max", |
1312 | .data = &files_stat.max_files, |
1313 | .maxlen = sizeof(int), |
1314 | .mode = 0644, |
1315 | .proc_handler = proc_dointvec, |
1316 | }, |
1317 | { |
1318 | .procname = "nr_open", |
1319 | .data = &sysctl_nr_open, |
1320 | .maxlen = sizeof(int), |
1321 | .mode = 0644, |
1322 | .proc_handler = proc_dointvec_minmax, |
1323 | .extra1 = &sysctl_nr_open_min, |
1324 | .extra2 = &sysctl_nr_open_max, |
1325 | }, |
1326 | { |
1327 | .procname = "dentry-state", |
1328 | .data = &dentry_stat, |
1329 | .maxlen = 6*sizeof(int), |
1330 | .mode = 0444, |
1331 | .proc_handler = proc_dointvec, |
1332 | }, |
1333 | { |
1334 | .procname = "overflowuid", |
1335 | .data = &fs_overflowuid, |
1336 | .maxlen = sizeof(int), |
1337 | .mode = 0644, |
1338 | .proc_handler = proc_dointvec_minmax, |
1339 | .extra1 = &minolduid, |
1340 | .extra2 = &maxolduid, |
1341 | }, |
1342 | { |
1343 | .procname = "overflowgid", |
1344 | .data = &fs_overflowgid, |
1345 | .maxlen = sizeof(int), |
1346 | .mode = 0644, |
1347 | .proc_handler = proc_dointvec_minmax, |
1348 | .extra1 = &minolduid, |
1349 | .extra2 = &maxolduid, |
1350 | }, |
1351 | #ifdef CONFIG_FILE_LOCKING |
1352 | { |
1353 | .procname = "leases-enable", |
1354 | .data = &leases_enable, |
1355 | .maxlen = sizeof(int), |
1356 | .mode = 0644, |
1357 | .proc_handler = proc_dointvec, |
1358 | }, |
1359 | #endif |
1360 | #ifdef CONFIG_DNOTIFY |
1361 | { |
1362 | .procname = "dir-notify-enable", |
1363 | .data = &dir_notify_enable, |
1364 | .maxlen = sizeof(int), |
1365 | .mode = 0644, |
1366 | .proc_handler = proc_dointvec, |
1367 | }, |
1368 | #endif |
1369 | #ifdef CONFIG_MMU |
1370 | #ifdef CONFIG_FILE_LOCKING |
1371 | { |
1372 | .procname = "lease-break-time", |
1373 | .data = &lease_break_time, |
1374 | .maxlen = sizeof(int), |
1375 | .mode = 0644, |
1376 | .proc_handler = proc_dointvec, |
1377 | }, |
1378 | #endif |
1379 | #ifdef CONFIG_AIO |
1380 | { |
1381 | .procname = "aio-nr", |
1382 | .data = &aio_nr, |
1383 | .maxlen = sizeof(aio_nr), |
1384 | .mode = 0444, |
1385 | .proc_handler = proc_doulongvec_minmax, |
1386 | }, |
1387 | { |
1388 | .procname = "aio-max-nr", |
1389 | .data = &aio_max_nr, |
1390 | .maxlen = sizeof(aio_max_nr), |
1391 | .mode = 0644, |
1392 | .proc_handler = proc_doulongvec_minmax, |
1393 | }, |
1394 | #endif /* CONFIG_AIO */ |
1395 | #ifdef CONFIG_INOTIFY_USER |
1396 | { |
1397 | .procname = "inotify", |
1398 | .mode = 0555, |
1399 | .child = inotify_table, |
1400 | }, |
1401 | #endif |
1402 | #ifdef CONFIG_EPOLL |
1403 | { |
1404 | .procname = "epoll", |
1405 | .mode = 0555, |
1406 | .child = epoll_table, |
1407 | }, |
1408 | #endif |
1409 | #endif |
1410 | { |
1411 | .procname = "suid_dumpable", |
1412 | .data = &suid_dumpable, |
1413 | .maxlen = sizeof(int), |
1414 | .mode = 0644, |
1415 | .proc_handler = proc_dointvec_minmax, |
1416 | .extra1 = &zero, |
1417 | .extra2 = &two, |
1418 | }, |
1419 | #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) |
1420 | { |
1421 | .procname = "binfmt_misc", |
1422 | .mode = 0555, |
1423 | .child = binfmt_misc_table, |
1424 | }, |
1425 | #endif |
1426 | /* |
1427 | * NOTE: do not add new entries to this table unless you have read |
1428 | * Documentation/sysctl/ctl_unnumbered.txt |
1429 | */ |
1430 | { } |
1431 | }; |
1432 | |
1433 | static struct ctl_table debug_table[] = { |
1434 | #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_SPARC) |
1435 | { |
1436 | .procname = "exception-trace", |
1437 | .data = &show_unhandled_signals, |
1438 | .maxlen = sizeof(int), |
1439 | .mode = 0644, |
1440 | .proc_handler = proc_dointvec |
1441 | }, |
1442 | #endif |
1443 | #if defined(CONFIG_OPTPROBES) |
1444 | { |
1445 | .procname = "kprobes-optimization", |
1446 | .data = &sysctl_kprobes_optimization, |
1447 | .maxlen = sizeof(int), |
1448 | .mode = 0644, |
1449 | .proc_handler = proc_kprobes_optimization_handler, |
1450 | .extra1 = &zero, |
1451 | .extra2 = &one, |
1452 | }, |
1453 | #endif |
1454 | { } |
1455 | }; |
1456 | |
1457 | static struct ctl_table dev_table[] = { |
1458 | { } |
1459 | }; |
1460 | |
1461 | static DEFINE_SPINLOCK(sysctl_lock); |
1462 | |
1463 | /* called under sysctl_lock */ |
1464 | static int use_table(struct ctl_table_header *p) |
1465 | { |
1466 | if (unlikely(p->unregistering)) |
1467 | return 0; |
1468 | p->used++; |
1469 | return 1; |
1470 | } |
1471 | |
1472 | /* called under sysctl_lock */ |
1473 | static void unuse_table(struct ctl_table_header *p) |
1474 | { |
1475 | if (!--p->used) |
1476 | if (unlikely(p->unregistering)) |
1477 | complete(p->unregistering); |
1478 | } |
1479 | |
1480 | /* called under sysctl_lock, will reacquire if has to wait */ |
1481 | static void start_unregistering(struct ctl_table_header *p) |
1482 | { |
1483 | /* |
1484 | * if p->used is 0, nobody will ever touch that entry again; |
1485 | * we'll eliminate all paths to it before dropping sysctl_lock |
1486 | */ |
1487 | if (unlikely(p->used)) { |
1488 | struct completion wait; |
1489 | init_completion(&wait); |
1490 | p->unregistering = &wait; |
1491 | spin_unlock(&sysctl_lock); |
1492 | wait_for_completion(&wait); |
1493 | spin_lock(&sysctl_lock); |
1494 | } else { |
1495 | /* anything non-NULL; we'll never dereference it */ |
1496 | p->unregistering = ERR_PTR(-EINVAL); |
1497 | } |
1498 | /* |
1499 | * do not remove from the list until nobody holds it; walking the |
1500 | * list in do_sysctl() relies on that. |
1501 | */ |
1502 | list_del_init(&p->ctl_entry); |
1503 | } |
1504 | |
1505 | void sysctl_head_get(struct ctl_table_header *head) |
1506 | { |
1507 | spin_lock(&sysctl_lock); |
1508 | head->count++; |
1509 | spin_unlock(&sysctl_lock); |
1510 | } |
1511 | |
1512 | void sysctl_head_put(struct ctl_table_header *head) |
1513 | { |
1514 | spin_lock(&sysctl_lock); |
1515 | if (!--head->count) |
1516 | kfree(head); |
1517 | spin_unlock(&sysctl_lock); |
1518 | } |
1519 | |
1520 | struct ctl_table_header *sysctl_head_grab(struct ctl_table_header *head) |
1521 | { |
1522 | if (!head) |
1523 | BUG(); |
1524 | spin_lock(&sysctl_lock); |
1525 | if (!use_table(head)) |
1526 | head = ERR_PTR(-ENOENT); |
1527 | spin_unlock(&sysctl_lock); |
1528 | return head; |
1529 | } |
1530 | |
1531 | void sysctl_head_finish(struct ctl_table_header *head) |
1532 | { |
1533 | if (!head) |
1534 | return; |
1535 | spin_lock(&sysctl_lock); |
1536 | unuse_table(head); |
1537 | spin_unlock(&sysctl_lock); |
1538 | } |
1539 | |
1540 | static struct ctl_table_set * |
1541 | lookup_header_set(struct ctl_table_root *root, struct nsproxy *namespaces) |
1542 | { |
1543 | struct ctl_table_set *set = &root->default_set; |
1544 | if (root->lookup) |
1545 | set = root->lookup(root, namespaces); |
1546 | return set; |
1547 | } |
1548 | |
1549 | static struct list_head * |
1550 | lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces) |
1551 | { |
1552 | struct ctl_table_set *set = lookup_header_set(root, namespaces); |
1553 | return &set->list; |
1554 | } |
1555 | |
1556 | struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces, |
1557 | struct ctl_table_header *prev) |
1558 | { |
1559 | struct ctl_table_root *root; |
1560 | struct list_head *header_list; |
1561 | struct ctl_table_header *head; |
1562 | struct list_head *tmp; |
1563 | |
1564 | spin_lock(&sysctl_lock); |
1565 | if (prev) { |
1566 | head = prev; |
1567 | tmp = &prev->ctl_entry; |
1568 | unuse_table(prev); |
1569 | goto next; |
1570 | } |
1571 | tmp = &root_table_header.ctl_entry; |
1572 | for (;;) { |
1573 | head = list_entry(tmp, struct ctl_table_header, ctl_entry); |
1574 | |
1575 | if (!use_table(head)) |
1576 | goto next; |
1577 | spin_unlock(&sysctl_lock); |
1578 | return head; |
1579 | next: |
1580 | root = head->root; |
1581 | tmp = tmp->next; |
1582 | header_list = lookup_header_list(root, namespaces); |
1583 | if (tmp != header_list) |
1584 | continue; |
1585 | |
1586 | do { |
1587 | root = list_entry(root->root_list.next, |
1588 | struct ctl_table_root, root_list); |
1589 | if (root == &sysctl_table_root) |
1590 | goto out; |
1591 | header_list = lookup_header_list(root, namespaces); |
1592 | } while (list_empty(header_list)); |
1593 | tmp = header_list->next; |
1594 | } |
1595 | out: |
1596 | spin_unlock(&sysctl_lock); |
1597 | return NULL; |
1598 | } |
1599 | |
1600 | struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev) |
1601 | { |
1602 | return __sysctl_head_next(current->nsproxy, prev); |
1603 | } |
1604 | |
1605 | void register_sysctl_root(struct ctl_table_root *root) |
1606 | { |
1607 | spin_lock(&sysctl_lock); |
1608 | list_add_tail(&root->root_list, &sysctl_table_root.root_list); |
1609 | spin_unlock(&sysctl_lock); |
1610 | } |
1611 | |
1612 | /* |
1613 | * sysctl_perm does NOT grant the superuser all rights automatically, because |
1614 | * some sysctl variables are readonly even to root. |
1615 | */ |
1616 | |
1617 | static int test_perm(int mode, int op) |
1618 | { |
1619 | if (!current_euid()) |
1620 | mode >>= 6; |
1621 | else if (in_egroup_p(0)) |
1622 | mode >>= 3; |
1623 | if ((op & ~mode & (MAY_READ|MAY_WRITE|MAY_EXEC)) == 0) |
1624 | return 0; |
1625 | return -EACCES; |
1626 | } |
1627 | |
1628 | int sysctl_perm(struct ctl_table_root *root, struct ctl_table *table, int op) |
1629 | { |
1630 | int error; |
1631 | int mode; |
1632 | |
1633 | error = security_sysctl(table, op & (MAY_READ | MAY_WRITE | MAY_EXEC)); |
1634 | if (error) |
1635 | return error; |
1636 | |
1637 | if (root->permissions) |
1638 | mode = root->permissions(root, current->nsproxy, table); |
1639 | else |
1640 | mode = table->mode; |
1641 | |
1642 | return test_perm(mode, op); |
1643 | } |
1644 | |
1645 | static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table) |
1646 | { |
1647 | for (; table->procname; table++) { |
1648 | table->parent = parent; |
1649 | if (table->child) |
1650 | sysctl_set_parent(table, table->child); |
1651 | } |
1652 | } |
1653 | |
1654 | static __init int sysctl_init(void) |
1655 | { |
1656 | sysctl_set_parent(NULL, root_table); |
1657 | #ifdef CONFIG_SYSCTL_SYSCALL_CHECK |
1658 | { |
1659 | int err; |
1660 | err = sysctl_check_table(current->nsproxy, root_table); |
1661 | } |
1662 | #endif |
1663 | return 0; |
1664 | } |
1665 | |
1666 | core_initcall(sysctl_init); |
1667 | |
1668 | static struct ctl_table *is_branch_in(struct ctl_table *branch, |
1669 | struct ctl_table *table) |
1670 | { |
1671 | struct ctl_table *p; |
1672 | const char *s = branch->procname; |
1673 | |
1674 | /* branch should have named subdirectory as its first element */ |
1675 | if (!s || !branch->child) |
1676 | return NULL; |
1677 | |
1678 | /* ... and nothing else */ |
1679 | if (branch[1].procname) |
1680 | return NULL; |
1681 | |
1682 | /* table should contain subdirectory with the same name */ |
1683 | for (p = table; p->procname; p++) { |
1684 | if (!p->child) |
1685 | continue; |
1686 | if (p->procname && strcmp(p->procname, s) == 0) |
1687 | return p; |
1688 | } |
1689 | return NULL; |
1690 | } |
1691 | |
1692 | /* see if attaching q to p would be an improvement */ |
1693 | static void try_attach(struct ctl_table_header *p, struct ctl_table_header *q) |
1694 | { |
1695 | struct ctl_table *to = p->ctl_table, *by = q->ctl_table; |
1696 | struct ctl_table *next; |
1697 | int is_better = 0; |
1698 | int not_in_parent = !p->attached_by; |
1699 | |
1700 | while ((next = is_branch_in(by, to)) != NULL) { |
1701 | if (by == q->attached_by) |
1702 | is_better = 1; |
1703 | if (to == p->attached_by) |
1704 | not_in_parent = 1; |
1705 | by = by->child; |
1706 | to = next->child; |
1707 | } |
1708 | |
1709 | if (is_better && not_in_parent) { |
1710 | q->attached_by = by; |
1711 | q->attached_to = to; |
1712 | q->parent = p; |
1713 | } |
1714 | } |
1715 | |
1716 | /** |
1717 | * __register_sysctl_paths - register a sysctl hierarchy |
1718 | * @root: List of sysctl headers to register on |
1719 | * @namespaces: Data to compute which lists of sysctl entries are visible |
1720 | * @path: The path to the directory the sysctl table is in. |
1721 | * @table: the top-level table structure |
1722 | * |
1723 | * Register a sysctl table hierarchy. @table should be a filled in ctl_table |
1724 | * array. A completely 0 filled entry terminates the table. |
1725 | * |
1726 | * The members of the &struct ctl_table structure are used as follows: |
1727 | * |
1728 | * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not |
1729 | * enter a sysctl file |
1730 | * |
1731 | * data - a pointer to data for use by proc_handler |
1732 | * |
1733 | * maxlen - the maximum size in bytes of the data |
1734 | * |
1735 | * mode - the file permissions for the /proc/sys file, and for sysctl(2) |
1736 | * |
1737 | * child - a pointer to the child sysctl table if this entry is a directory, or |
1738 | * %NULL. |
1739 | * |
1740 | * proc_handler - the text handler routine (described below) |
1741 | * |
1742 | * de - for internal use by the sysctl routines |
1743 | * |
1744 | * extra1, extra2 - extra pointers usable by the proc handler routines |
1745 | * |
1746 | * Leaf nodes in the sysctl tree will be represented by a single file |
1747 | * under /proc; non-leaf nodes will be represented by directories. |
1748 | * |
1749 | * sysctl(2) can automatically manage read and write requests through |
1750 | * the sysctl table. The data and maxlen fields of the ctl_table |
1751 | * struct enable minimal validation of the values being written to be |
1752 | * performed, and the mode field allows minimal authentication. |
1753 | * |
1754 | * There must be a proc_handler routine for any terminal nodes |
1755 | * mirrored under /proc/sys (non-terminals are handled by a built-in |
1756 | * directory handler). Several default handlers are available to |
1757 | * cover common cases - |
1758 | * |
1759 | * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(), |
1760 | * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(), |
1761 | * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax() |
1762 | * |
1763 | * It is the handler's job to read the input buffer from user memory |
1764 | * and process it. The handler should return 0 on success. |
1765 | * |
1766 | * This routine returns %NULL on a failure to register, and a pointer |
1767 | * to the table header on success. |
1768 | */ |
1769 | struct ctl_table_header *__register_sysctl_paths( |
1770 | struct ctl_table_root *root, |
1771 | struct nsproxy *namespaces, |
1772 | const struct ctl_path *path, struct ctl_table *table) |
1773 | { |
1774 | struct ctl_table_header *header; |
1775 | struct ctl_table *new, **prevp; |
1776 | unsigned int n, npath; |
1777 | struct ctl_table_set *set; |
1778 | |
1779 | /* Count the path components */ |
1780 | for (npath = 0; path[npath].procname; ++npath) |
1781 | ; |
1782 | |
1783 | /* |
1784 | * For each path component, allocate a 2-element ctl_table array. |
1785 | * The first array element will be filled with the sysctl entry |
1786 | * for this, the second will be the sentinel (procname == 0). |
1787 | * |
1788 | * We allocate everything in one go so that we don't have to |
1789 | * worry about freeing additional memory in unregister_sysctl_table. |
1790 | */ |
1791 | header = kzalloc(sizeof(struct ctl_table_header) + |
1792 | (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL); |
1793 | if (!header) |
1794 | return NULL; |
1795 | |
1796 | new = (struct ctl_table *) (header + 1); |
1797 | |
1798 | /* Now connect the dots */ |
1799 | prevp = &header->ctl_table; |
1800 | for (n = 0; n < npath; ++n, ++path) { |
1801 | /* Copy the procname */ |
1802 | new->procname = path->procname; |
1803 | new->mode = 0555; |
1804 | |
1805 | *prevp = new; |
1806 | prevp = &new->child; |
1807 | |
1808 | new += 2; |
1809 | } |
1810 | *prevp = table; |
1811 | header->ctl_table_arg = table; |
1812 | |
1813 | INIT_LIST_HEAD(&header->ctl_entry); |
1814 | header->used = 0; |
1815 | header->unregistering = NULL; |
1816 | header->root = root; |
1817 | sysctl_set_parent(NULL, header->ctl_table); |
1818 | header->count = 1; |
1819 | #ifdef CONFIG_SYSCTL_SYSCALL_CHECK |
1820 | if (sysctl_check_table(namespaces, header->ctl_table)) { |
1821 | kfree(header); |
1822 | return NULL; |
1823 | } |
1824 | #endif |
1825 | spin_lock(&sysctl_lock); |
1826 | header->set = lookup_header_set(root, namespaces); |
1827 | header->attached_by = header->ctl_table; |
1828 | header->attached_to = root_table; |
1829 | header->parent = &root_table_header; |
1830 | for (set = header->set; set; set = set->parent) { |
1831 | struct ctl_table_header *p; |
1832 | list_for_each_entry(p, &set->list, ctl_entry) { |
1833 | if (p->unregistering) |
1834 | continue; |
1835 | try_attach(p, header); |
1836 | } |
1837 | } |
1838 | header->parent->count++; |
1839 | list_add_tail(&header->ctl_entry, &header->set->list); |
1840 | spin_unlock(&sysctl_lock); |
1841 | |
1842 | return header; |
1843 | } |
1844 | |
1845 | /** |
1846 | * register_sysctl_table_path - register a sysctl table hierarchy |
1847 | * @path: The path to the directory the sysctl table is in. |
1848 | * @table: the top-level table structure |
1849 | * |
1850 | * Register a sysctl table hierarchy. @table should be a filled in ctl_table |
1851 | * array. A completely 0 filled entry terminates the table. |
1852 | * |
1853 | * See __register_sysctl_paths for more details. |
1854 | */ |
1855 | struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path, |
1856 | struct ctl_table *table) |
1857 | { |
1858 | return __register_sysctl_paths(&sysctl_table_root, current->nsproxy, |
1859 | path, table); |
1860 | } |
1861 | |
1862 | /** |
1863 | * register_sysctl_table - register a sysctl table hierarchy |
1864 | * @table: the top-level table structure |
1865 | * |
1866 | * Register a sysctl table hierarchy. @table should be a filled in ctl_table |
1867 | * array. A completely 0 filled entry terminates the table. |
1868 | * |
1869 | * See register_sysctl_paths for more details. |
1870 | */ |
1871 | struct ctl_table_header *register_sysctl_table(struct ctl_table *table) |
1872 | { |
1873 | static const struct ctl_path null_path[] = { {} }; |
1874 | |
1875 | return register_sysctl_paths(null_path, table); |
1876 | } |
1877 | |
1878 | /** |
1879 | * unregister_sysctl_table - unregister a sysctl table hierarchy |
1880 | * @header: the header returned from register_sysctl_table |
1881 | * |
1882 | * Unregisters the sysctl table and all children. proc entries may not |
1883 | * actually be removed until they are no longer used by anyone. |
1884 | */ |
1885 | void unregister_sysctl_table(struct ctl_table_header * header) |
1886 | { |
1887 | might_sleep(); |
1888 | |
1889 | if (header == NULL) |
1890 | return; |
1891 | |
1892 | spin_lock(&sysctl_lock); |
1893 | start_unregistering(header); |
1894 | if (!--header->parent->count) { |
1895 | WARN_ON(1); |
1896 | kfree(header->parent); |
1897 | } |
1898 | if (!--header->count) |
1899 | kfree(header); |
1900 | spin_unlock(&sysctl_lock); |
1901 | } |
1902 | |
1903 | int sysctl_is_seen(struct ctl_table_header *p) |
1904 | { |
1905 | struct ctl_table_set *set = p->set; |
1906 | int res; |
1907 | spin_lock(&sysctl_lock); |
1908 | if (p->unregistering) |
1909 | res = 0; |
1910 | else if (!set->is_seen) |
1911 | res = 1; |
1912 | else |
1913 | res = set->is_seen(set); |
1914 | spin_unlock(&sysctl_lock); |
1915 | return res; |
1916 | } |
1917 | |
1918 | void setup_sysctl_set(struct ctl_table_set *p, |
1919 | struct ctl_table_set *parent, |
1920 | int (*is_seen)(struct ctl_table_set *)) |
1921 | { |
1922 | INIT_LIST_HEAD(&p->list); |
1923 | p->parent = parent ? parent : &sysctl_table_root.default_set; |
1924 | p->is_seen = is_seen; |
1925 | } |
1926 | |
1927 | #else /* !CONFIG_SYSCTL */ |
1928 | struct ctl_table_header *register_sysctl_table(struct ctl_table * table) |
1929 | { |
1930 | return NULL; |
1931 | } |
1932 | |
1933 | struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path, |
1934 | struct ctl_table *table) |
1935 | { |
1936 | return NULL; |
1937 | } |
1938 | |
1939 | void unregister_sysctl_table(struct ctl_table_header * table) |
1940 | { |
1941 | } |
1942 | |
1943 | void setup_sysctl_set(struct ctl_table_set *p, |
1944 | struct ctl_table_set *parent, |
1945 | int (*is_seen)(struct ctl_table_set *)) |
1946 | { |
1947 | } |
1948 | |
1949 | void sysctl_head_put(struct ctl_table_header *head) |
1950 | { |
1951 | } |
1952 | |
1953 | #endif /* CONFIG_SYSCTL */ |
1954 | |
1955 | /* |
1956 | * /proc/sys support |
1957 | */ |
1958 | |
1959 | #ifdef CONFIG_PROC_SYSCTL |
1960 | |
1961 | static int _proc_do_string(void* data, int maxlen, int write, |
1962 | void __user *buffer, |
1963 | size_t *lenp, loff_t *ppos) |
1964 | { |
1965 | size_t len; |
1966 | char __user *p; |
1967 | char c; |
1968 | |
1969 | if (!data || !maxlen || !*lenp) { |
1970 | *lenp = 0; |
1971 | return 0; |
1972 | } |
1973 | |
1974 | if (write) { |
1975 | len = 0; |
1976 | p = buffer; |
1977 | while (len < *lenp) { |
1978 | if (get_user(c, p++)) |
1979 | return -EFAULT; |
1980 | if (c == 0 || c == '\n') |
1981 | break; |
1982 | len++; |
1983 | } |
1984 | if (len >= maxlen) |
1985 | len = maxlen-1; |
1986 | if(copy_from_user(data, buffer, len)) |
1987 | return -EFAULT; |
1988 | ((char *) data)[len] = 0; |
1989 | *ppos += *lenp; |
1990 | } else { |
1991 | len = strlen(data); |
1992 | if (len > maxlen) |
1993 | len = maxlen; |
1994 | |
1995 | if (*ppos > len) { |
1996 | *lenp = 0; |
1997 | return 0; |
1998 | } |
1999 | |
2000 | data += *ppos; |
2001 | len -= *ppos; |
2002 | |
2003 | if (len > *lenp) |
2004 | len = *lenp; |
2005 | if (len) |
2006 | if(copy_to_user(buffer, data, len)) |
2007 | return -EFAULT; |
2008 | if (len < *lenp) { |
2009 | if(put_user('\n', ((char __user *) buffer) + len)) |
2010 | return -EFAULT; |
2011 | len++; |
2012 | } |
2013 | *lenp = len; |
2014 | *ppos += len; |
2015 | } |
2016 | return 0; |
2017 | } |
2018 | |
2019 | /** |
2020 | * proc_dostring - read a string sysctl |
2021 | * @table: the sysctl table |
2022 | * @write: %TRUE if this is a write to the sysctl file |
2023 | * @buffer: the user buffer |
2024 | * @lenp: the size of the user buffer |
2025 | * @ppos: file position |
2026 | * |
2027 | * Reads/writes a string from/to the user buffer. If the kernel |
2028 | * buffer provided is not large enough to hold the string, the |
2029 | * string is truncated. The copied string is %NULL-terminated. |
2030 | * If the string is being read by the user process, it is copied |
2031 | * and a newline '\n' is added. It is truncated if the buffer is |
2032 | * not large enough. |
2033 | * |
2034 | * Returns 0 on success. |
2035 | */ |
2036 | int proc_dostring(struct ctl_table *table, int write, |
2037 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2038 | { |
2039 | return _proc_do_string(table->data, table->maxlen, write, |
2040 | buffer, lenp, ppos); |
2041 | } |
2042 | |
2043 | |
2044 | static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp, |
2045 | int *valp, |
2046 | int write, void *data) |
2047 | { |
2048 | if (write) { |
2049 | *valp = *negp ? -*lvalp : *lvalp; |
2050 | } else { |
2051 | int val = *valp; |
2052 | if (val < 0) { |
2053 | *negp = -1; |
2054 | *lvalp = (unsigned long)-val; |
2055 | } else { |
2056 | *negp = 0; |
2057 | *lvalp = (unsigned long)val; |
2058 | } |
2059 | } |
2060 | return 0; |
2061 | } |
2062 | |
2063 | static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table, |
2064 | int write, void __user *buffer, |
2065 | size_t *lenp, loff_t *ppos, |
2066 | int (*conv)(int *negp, unsigned long *lvalp, int *valp, |
2067 | int write, void *data), |
2068 | void *data) |
2069 | { |
2070 | #define TMPBUFLEN 21 |
2071 | int *i, vleft, first = 1, neg; |
2072 | unsigned long lval; |
2073 | size_t left, len; |
2074 | |
2075 | char buf[TMPBUFLEN], *p; |
2076 | char __user *s = buffer; |
2077 | |
2078 | if (!tbl_data || !table->maxlen || !*lenp || |
2079 | (*ppos && !write)) { |
2080 | *lenp = 0; |
2081 | return 0; |
2082 | } |
2083 | |
2084 | i = (int *) tbl_data; |
2085 | vleft = table->maxlen / sizeof(*i); |
2086 | left = *lenp; |
2087 | |
2088 | if (!conv) |
2089 | conv = do_proc_dointvec_conv; |
2090 | |
2091 | for (; left && vleft--; i++, first=0) { |
2092 | if (write) { |
2093 | while (left) { |
2094 | char c; |
2095 | if (get_user(c, s)) |
2096 | return -EFAULT; |
2097 | if (!isspace(c)) |
2098 | break; |
2099 | left--; |
2100 | s++; |
2101 | } |
2102 | if (!left) |
2103 | break; |
2104 | neg = 0; |
2105 | len = left; |
2106 | if (len > sizeof(buf) - 1) |
2107 | len = sizeof(buf) - 1; |
2108 | if (copy_from_user(buf, s, len)) |
2109 | return -EFAULT; |
2110 | buf[len] = 0; |
2111 | p = buf; |
2112 | if (*p == '-' && left > 1) { |
2113 | neg = 1; |
2114 | p++; |
2115 | } |
2116 | if (*p < '0' || *p > '9') |
2117 | break; |
2118 | |
2119 | lval = simple_strtoul(p, &p, 0); |
2120 | |
2121 | len = p-buf; |
2122 | if ((len < left) && *p && !isspace(*p)) |
2123 | break; |
2124 | s += len; |
2125 | left -= len; |
2126 | |
2127 | if (conv(&neg, &lval, i, 1, data)) |
2128 | break; |
2129 | } else { |
2130 | p = buf; |
2131 | if (!first) |
2132 | *p++ = '\t'; |
2133 | |
2134 | if (conv(&neg, &lval, i, 0, data)) |
2135 | break; |
2136 | |
2137 | sprintf(p, "%s%lu", neg ? "-" : "", lval); |
2138 | len = strlen(buf); |
2139 | if (len > left) |
2140 | len = left; |
2141 | if(copy_to_user(s, buf, len)) |
2142 | return -EFAULT; |
2143 | left -= len; |
2144 | s += len; |
2145 | } |
2146 | } |
2147 | |
2148 | if (!write && !first && left) { |
2149 | if(put_user('\n', s)) |
2150 | return -EFAULT; |
2151 | left--, s++; |
2152 | } |
2153 | if (write) { |
2154 | while (left) { |
2155 | char c; |
2156 | if (get_user(c, s++)) |
2157 | return -EFAULT; |
2158 | if (!isspace(c)) |
2159 | break; |
2160 | left--; |
2161 | } |
2162 | } |
2163 | if (write && first) |
2164 | return -EINVAL; |
2165 | *lenp -= left; |
2166 | *ppos += *lenp; |
2167 | return 0; |
2168 | #undef TMPBUFLEN |
2169 | } |
2170 | |
2171 | static int do_proc_dointvec(struct ctl_table *table, int write, |
2172 | void __user *buffer, size_t *lenp, loff_t *ppos, |
2173 | int (*conv)(int *negp, unsigned long *lvalp, int *valp, |
2174 | int write, void *data), |
2175 | void *data) |
2176 | { |
2177 | return __do_proc_dointvec(table->data, table, write, |
2178 | buffer, lenp, ppos, conv, data); |
2179 | } |
2180 | |
2181 | /** |
2182 | * proc_dointvec - read a vector of integers |
2183 | * @table: the sysctl table |
2184 | * @write: %TRUE if this is a write to the sysctl file |
2185 | * @buffer: the user buffer |
2186 | * @lenp: the size of the user buffer |
2187 | * @ppos: file position |
2188 | * |
2189 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer |
2190 | * values from/to the user buffer, treated as an ASCII string. |
2191 | * |
2192 | * Returns 0 on success. |
2193 | */ |
2194 | int proc_dointvec(struct ctl_table *table, int write, |
2195 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2196 | { |
2197 | return do_proc_dointvec(table,write,buffer,lenp,ppos, |
2198 | NULL,NULL); |
2199 | } |
2200 | |
2201 | /* |
2202 | * Taint values can only be increased |
2203 | * This means we can safely use a temporary. |
2204 | */ |
2205 | static int proc_taint(struct ctl_table *table, int write, |
2206 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2207 | { |
2208 | struct ctl_table t; |
2209 | unsigned long tmptaint = get_taint(); |
2210 | int err; |
2211 | |
2212 | if (write && !capable(CAP_SYS_ADMIN)) |
2213 | return -EPERM; |
2214 | |
2215 | t = *table; |
2216 | t.data = &tmptaint; |
2217 | err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos); |
2218 | if (err < 0) |
2219 | return err; |
2220 | |
2221 | if (write) { |
2222 | /* |
2223 | * Poor man's atomic or. Not worth adding a primitive |
2224 | * to everyone's atomic.h for this |
2225 | */ |
2226 | int i; |
2227 | for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) { |
2228 | if ((tmptaint >> i) & 1) |
2229 | add_taint(i); |
2230 | } |
2231 | } |
2232 | |
2233 | return err; |
2234 | } |
2235 | |
2236 | struct do_proc_dointvec_minmax_conv_param { |
2237 | int *min; |
2238 | int *max; |
2239 | }; |
2240 | |
2241 | static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp, |
2242 | int *valp, |
2243 | int write, void *data) |
2244 | { |
2245 | struct do_proc_dointvec_minmax_conv_param *param = data; |
2246 | if (write) { |
2247 | int val = *negp ? -*lvalp : *lvalp; |
2248 | if ((param->min && *param->min > val) || |
2249 | (param->max && *param->max < val)) |
2250 | return -EINVAL; |
2251 | *valp = val; |
2252 | } else { |
2253 | int val = *valp; |
2254 | if (val < 0) { |
2255 | *negp = -1; |
2256 | *lvalp = (unsigned long)-val; |
2257 | } else { |
2258 | *negp = 0; |
2259 | *lvalp = (unsigned long)val; |
2260 | } |
2261 | } |
2262 | return 0; |
2263 | } |
2264 | |
2265 | /** |
2266 | * proc_dointvec_minmax - read a vector of integers with min/max values |
2267 | * @table: the sysctl table |
2268 | * @write: %TRUE if this is a write to the sysctl file |
2269 | * @buffer: the user buffer |
2270 | * @lenp: the size of the user buffer |
2271 | * @ppos: file position |
2272 | * |
2273 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer |
2274 | * values from/to the user buffer, treated as an ASCII string. |
2275 | * |
2276 | * This routine will ensure the values are within the range specified by |
2277 | * table->extra1 (min) and table->extra2 (max). |
2278 | * |
2279 | * Returns 0 on success. |
2280 | */ |
2281 | int proc_dointvec_minmax(struct ctl_table *table, int write, |
2282 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2283 | { |
2284 | struct do_proc_dointvec_minmax_conv_param param = { |
2285 | .min = (int *) table->extra1, |
2286 | .max = (int *) table->extra2, |
2287 | }; |
2288 | return do_proc_dointvec(table, write, buffer, lenp, ppos, |
2289 | do_proc_dointvec_minmax_conv, ¶m); |
2290 | } |
2291 | |
2292 | static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write, |
2293 | void __user *buffer, |
2294 | size_t *lenp, loff_t *ppos, |
2295 | unsigned long convmul, |
2296 | unsigned long convdiv) |
2297 | { |
2298 | #define TMPBUFLEN 21 |
2299 | unsigned long *i, *min, *max, val; |
2300 | int vleft, first=1, neg; |
2301 | size_t len, left; |
2302 | char buf[TMPBUFLEN], *p; |
2303 | char __user *s = buffer; |
2304 | |
2305 | if (!data || !table->maxlen || !*lenp || |
2306 | (*ppos && !write)) { |
2307 | *lenp = 0; |
2308 | return 0; |
2309 | } |
2310 | |
2311 | i = (unsigned long *) data; |
2312 | min = (unsigned long *) table->extra1; |
2313 | max = (unsigned long *) table->extra2; |
2314 | vleft = table->maxlen / sizeof(unsigned long); |
2315 | left = *lenp; |
2316 | |
2317 | for (; left && vleft--; i++, min++, max++, first=0) { |
2318 | if (write) { |
2319 | while (left) { |
2320 | char c; |
2321 | if (get_user(c, s)) |
2322 | return -EFAULT; |
2323 | if (!isspace(c)) |
2324 | break; |
2325 | left--; |
2326 | s++; |
2327 | } |
2328 | if (!left) |
2329 | break; |
2330 | neg = 0; |
2331 | len = left; |
2332 | if (len > TMPBUFLEN-1) |
2333 | len = TMPBUFLEN-1; |
2334 | if (copy_from_user(buf, s, len)) |
2335 | return -EFAULT; |
2336 | buf[len] = 0; |
2337 | p = buf; |
2338 | if (*p == '-' && left > 1) { |
2339 | neg = 1; |
2340 | p++; |
2341 | } |
2342 | if (*p < '0' || *p > '9') |
2343 | break; |
2344 | val = simple_strtoul(p, &p, 0) * convmul / convdiv ; |
2345 | len = p-buf; |
2346 | if ((len < left) && *p && !isspace(*p)) |
2347 | break; |
2348 | if (neg) |
2349 | val = -val; |
2350 | s += len; |
2351 | left -= len; |
2352 | |
2353 | if(neg) |
2354 | continue; |
2355 | if ((min && val < *min) || (max && val > *max)) |
2356 | continue; |
2357 | *i = val; |
2358 | } else { |
2359 | p = buf; |
2360 | if (!first) |
2361 | *p++ = '\t'; |
2362 | sprintf(p, "%lu", convdiv * (*i) / convmul); |
2363 | len = strlen(buf); |
2364 | if (len > left) |
2365 | len = left; |
2366 | if(copy_to_user(s, buf, len)) |
2367 | return -EFAULT; |
2368 | left -= len; |
2369 | s += len; |
2370 | } |
2371 | } |
2372 | |
2373 | if (!write && !first && left) { |
2374 | if(put_user('\n', s)) |
2375 | return -EFAULT; |
2376 | left--, s++; |
2377 | } |
2378 | if (write) { |
2379 | while (left) { |
2380 | char c; |
2381 | if (get_user(c, s++)) |
2382 | return -EFAULT; |
2383 | if (!isspace(c)) |
2384 | break; |
2385 | left--; |
2386 | } |
2387 | } |
2388 | if (write && first) |
2389 | return -EINVAL; |
2390 | *lenp -= left; |
2391 | *ppos += *lenp; |
2392 | return 0; |
2393 | #undef TMPBUFLEN |
2394 | } |
2395 | |
2396 | static int do_proc_doulongvec_minmax(struct ctl_table *table, int write, |
2397 | void __user *buffer, |
2398 | size_t *lenp, loff_t *ppos, |
2399 | unsigned long convmul, |
2400 | unsigned long convdiv) |
2401 | { |
2402 | return __do_proc_doulongvec_minmax(table->data, table, write, |
2403 | buffer, lenp, ppos, convmul, convdiv); |
2404 | } |
2405 | |
2406 | /** |
2407 | * proc_doulongvec_minmax - read a vector of long integers with min/max values |
2408 | * @table: the sysctl table |
2409 | * @write: %TRUE if this is a write to the sysctl file |
2410 | * @buffer: the user buffer |
2411 | * @lenp: the size of the user buffer |
2412 | * @ppos: file position |
2413 | * |
2414 | * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long |
2415 | * values from/to the user buffer, treated as an ASCII string. |
2416 | * |
2417 | * This routine will ensure the values are within the range specified by |
2418 | * table->extra1 (min) and table->extra2 (max). |
2419 | * |
2420 | * Returns 0 on success. |
2421 | */ |
2422 | int proc_doulongvec_minmax(struct ctl_table *table, int write, |
2423 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2424 | { |
2425 | return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l); |
2426 | } |
2427 | |
2428 | /** |
2429 | * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values |
2430 | * @table: the sysctl table |
2431 | * @write: %TRUE if this is a write to the sysctl file |
2432 | * @buffer: the user buffer |
2433 | * @lenp: the size of the user buffer |
2434 | * @ppos: file position |
2435 | * |
2436 | * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long |
2437 | * values from/to the user buffer, treated as an ASCII string. The values |
2438 | * are treated as milliseconds, and converted to jiffies when they are stored. |
2439 | * |
2440 | * This routine will ensure the values are within the range specified by |
2441 | * table->extra1 (min) and table->extra2 (max). |
2442 | * |
2443 | * Returns 0 on success. |
2444 | */ |
2445 | int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, |
2446 | void __user *buffer, |
2447 | size_t *lenp, loff_t *ppos) |
2448 | { |
2449 | return do_proc_doulongvec_minmax(table, write, buffer, |
2450 | lenp, ppos, HZ, 1000l); |
2451 | } |
2452 | |
2453 | |
2454 | static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp, |
2455 | int *valp, |
2456 | int write, void *data) |
2457 | { |
2458 | if (write) { |
2459 | if (*lvalp > LONG_MAX / HZ) |
2460 | return 1; |
2461 | *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ); |
2462 | } else { |
2463 | int val = *valp; |
2464 | unsigned long lval; |
2465 | if (val < 0) { |
2466 | *negp = -1; |
2467 | lval = (unsigned long)-val; |
2468 | } else { |
2469 | *negp = 0; |
2470 | lval = (unsigned long)val; |
2471 | } |
2472 | *lvalp = lval / HZ; |
2473 | } |
2474 | return 0; |
2475 | } |
2476 | |
2477 | static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp, |
2478 | int *valp, |
2479 | int write, void *data) |
2480 | { |
2481 | if (write) { |
2482 | if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ) |
2483 | return 1; |
2484 | *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp); |
2485 | } else { |
2486 | int val = *valp; |
2487 | unsigned long lval; |
2488 | if (val < 0) { |
2489 | *negp = -1; |
2490 | lval = (unsigned long)-val; |
2491 | } else { |
2492 | *negp = 0; |
2493 | lval = (unsigned long)val; |
2494 | } |
2495 | *lvalp = jiffies_to_clock_t(lval); |
2496 | } |
2497 | return 0; |
2498 | } |
2499 | |
2500 | static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp, |
2501 | int *valp, |
2502 | int write, void *data) |
2503 | { |
2504 | if (write) { |
2505 | *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp); |
2506 | } else { |
2507 | int val = *valp; |
2508 | unsigned long lval; |
2509 | if (val < 0) { |
2510 | *negp = -1; |
2511 | lval = (unsigned long)-val; |
2512 | } else { |
2513 | *negp = 0; |
2514 | lval = (unsigned long)val; |
2515 | } |
2516 | *lvalp = jiffies_to_msecs(lval); |
2517 | } |
2518 | return 0; |
2519 | } |
2520 | |
2521 | /** |
2522 | * proc_dointvec_jiffies - read a vector of integers as seconds |
2523 | * @table: the sysctl table |
2524 | * @write: %TRUE if this is a write to the sysctl file |
2525 | * @buffer: the user buffer |
2526 | * @lenp: the size of the user buffer |
2527 | * @ppos: file position |
2528 | * |
2529 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer |
2530 | * values from/to the user buffer, treated as an ASCII string. |
2531 | * The values read are assumed to be in seconds, and are converted into |
2532 | * jiffies. |
2533 | * |
2534 | * Returns 0 on success. |
2535 | */ |
2536 | int proc_dointvec_jiffies(struct ctl_table *table, int write, |
2537 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2538 | { |
2539 | return do_proc_dointvec(table,write,buffer,lenp,ppos, |
2540 | do_proc_dointvec_jiffies_conv,NULL); |
2541 | } |
2542 | |
2543 | /** |
2544 | * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds |
2545 | * @table: the sysctl table |
2546 | * @write: %TRUE if this is a write to the sysctl file |
2547 | * @buffer: the user buffer |
2548 | * @lenp: the size of the user buffer |
2549 | * @ppos: pointer to the file position |
2550 | * |
2551 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer |
2552 | * values from/to the user buffer, treated as an ASCII string. |
2553 | * The values read are assumed to be in 1/USER_HZ seconds, and |
2554 | * are converted into jiffies. |
2555 | * |
2556 | * Returns 0 on success. |
2557 | */ |
2558 | int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, |
2559 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2560 | { |
2561 | return do_proc_dointvec(table,write,buffer,lenp,ppos, |
2562 | do_proc_dointvec_userhz_jiffies_conv,NULL); |
2563 | } |
2564 | |
2565 | /** |
2566 | * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds |
2567 | * @table: the sysctl table |
2568 | * @write: %TRUE if this is a write to the sysctl file |
2569 | * @buffer: the user buffer |
2570 | * @lenp: the size of the user buffer |
2571 | * @ppos: file position |
2572 | * @ppos: the current position in the file |
2573 | * |
2574 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer |
2575 | * values from/to the user buffer, treated as an ASCII string. |
2576 | * The values read are assumed to be in 1/1000 seconds, and |
2577 | * are converted into jiffies. |
2578 | * |
2579 | * Returns 0 on success. |
2580 | */ |
2581 | int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, |
2582 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2583 | { |
2584 | return do_proc_dointvec(table, write, buffer, lenp, ppos, |
2585 | do_proc_dointvec_ms_jiffies_conv, NULL); |
2586 | } |
2587 | |
2588 | static int proc_do_cad_pid(struct ctl_table *table, int write, |
2589 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2590 | { |
2591 | struct pid *new_pid; |
2592 | pid_t tmp; |
2593 | int r; |
2594 | |
2595 | tmp = pid_vnr(cad_pid); |
2596 | |
2597 | r = __do_proc_dointvec(&tmp, table, write, buffer, |
2598 | lenp, ppos, NULL, NULL); |
2599 | if (r || !write) |
2600 | return r; |
2601 | |
2602 | new_pid = find_get_pid(tmp); |
2603 | if (!new_pid) |
2604 | return -ESRCH; |
2605 | |
2606 | put_pid(xchg(&cad_pid, new_pid)); |
2607 | return 0; |
2608 | } |
2609 | |
2610 | #else /* CONFIG_PROC_FS */ |
2611 | |
2612 | int proc_dostring(struct ctl_table *table, int write, |
2613 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2614 | { |
2615 | return -ENOSYS; |
2616 | } |
2617 | |
2618 | int proc_dointvec(struct ctl_table *table, int write, |
2619 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2620 | { |
2621 | return -ENOSYS; |
2622 | } |
2623 | |
2624 | int proc_dointvec_minmax(struct ctl_table *table, int write, |
2625 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2626 | { |
2627 | return -ENOSYS; |
2628 | } |
2629 | |
2630 | int proc_dointvec_jiffies(struct ctl_table *table, int write, |
2631 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2632 | { |
2633 | return -ENOSYS; |
2634 | } |
2635 | |
2636 | int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, |
2637 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2638 | { |
2639 | return -ENOSYS; |
2640 | } |
2641 | |
2642 | int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, |
2643 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2644 | { |
2645 | return -ENOSYS; |
2646 | } |
2647 | |
2648 | int proc_doulongvec_minmax(struct ctl_table *table, int write, |
2649 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2650 | { |
2651 | return -ENOSYS; |
2652 | } |
2653 | |
2654 | int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, |
2655 | void __user *buffer, |
2656 | size_t *lenp, loff_t *ppos) |
2657 | { |
2658 | return -ENOSYS; |
2659 | } |
2660 | |
2661 | |
2662 | #endif /* CONFIG_PROC_FS */ |
2663 | |
2664 | /* |
2665 | * No sense putting this after each symbol definition, twice, |
2666 | * exception granted :-) |
2667 | */ |
2668 | EXPORT_SYMBOL(proc_dointvec); |
2669 | EXPORT_SYMBOL(proc_dointvec_jiffies); |
2670 | EXPORT_SYMBOL(proc_dointvec_minmax); |
2671 | EXPORT_SYMBOL(proc_dointvec_userhz_jiffies); |
2672 | EXPORT_SYMBOL(proc_dointvec_ms_jiffies); |
2673 | EXPORT_SYMBOL(proc_dostring); |
2674 | EXPORT_SYMBOL(proc_doulongvec_minmax); |
2675 | EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax); |
2676 | EXPORT_SYMBOL(register_sysctl_table); |
2677 | EXPORT_SYMBOL(register_sysctl_paths); |
2678 | EXPORT_SYMBOL(unregister_sysctl_table); |
2679 |
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