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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/printk.h> |
28 | #include <linux/proc_fs.h> |
29 | #include <linux/security.h> |
30 | #include <linux/ctype.h> |
31 | #include <linux/kmemcheck.h> |
32 | #include <linux/fs.h> |
33 | #include <linux/init.h> |
34 | #include <linux/kernel.h> |
35 | #include <linux/kobject.h> |
36 | #include <linux/net.h> |
37 | #include <linux/sysrq.h> |
38 | #include <linux/highuid.h> |
39 | #include <linux/writeback.h> |
40 | #include <linux/ratelimit.h> |
41 | #include <linux/compaction.h> |
42 | #include <linux/hugetlb.h> |
43 | #include <linux/initrd.h> |
44 | #include <linux/key.h> |
45 | #include <linux/times.h> |
46 | #include <linux/limits.h> |
47 | #include <linux/dcache.h> |
48 | #include <linux/dnotify.h> |
49 | #include <linux/syscalls.h> |
50 | #include <linux/vmstat.h> |
51 | #include <linux/nfs_fs.h> |
52 | #include <linux/acpi.h> |
53 | #include <linux/reboot.h> |
54 | #include <linux/ftrace.h> |
55 | #include <linux/perf_event.h> |
56 | #include <linux/kprobes.h> |
57 | #include <linux/pipe_fs_i.h> |
58 | #include <linux/oom.h> |
59 | |
60 | #include <asm/uaccess.h> |
61 | #include <asm/processor.h> |
62 | |
63 | #ifdef CONFIG_X86 |
64 | #include <asm/nmi.h> |
65 | #include <asm/stacktrace.h> |
66 | #include <asm/io.h> |
67 | #endif |
68 | #ifdef CONFIG_BSD_PROCESS_ACCT |
69 | #include <linux/acct.h> |
70 | #endif |
71 | #ifdef CONFIG_RT_MUTEXES |
72 | #include <linux/rtmutex.h> |
73 | #endif |
74 | #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT) |
75 | #include <linux/lockdep.h> |
76 | #endif |
77 | #ifdef CONFIG_CHR_DEV_SG |
78 | #include <scsi/sg.h> |
79 | #endif |
80 | |
81 | #ifdef CONFIG_LOCKUP_DETECTOR |
82 | #include <linux/nmi.h> |
83 | #endif |
84 | |
85 | |
86 | #if defined(CONFIG_SYSCTL) |
87 | |
88 | /* External variables not in a header file. */ |
89 | extern int sysctl_overcommit_memory; |
90 | extern int sysctl_overcommit_ratio; |
91 | extern int max_threads; |
92 | extern int core_uses_pid; |
93 | extern int suid_dumpable; |
94 | extern char core_pattern[]; |
95 | extern unsigned int core_pipe_limit; |
96 | extern int pid_max; |
97 | extern int min_free_kbytes; |
98 | extern int pid_max_min, pid_max_max; |
99 | extern int sysctl_drop_caches; |
100 | extern int percpu_pagelist_fraction; |
101 | extern int compat_log; |
102 | extern int latencytop_enabled; |
103 | extern int sysctl_nr_open_min, sysctl_nr_open_max; |
104 | #ifndef CONFIG_MMU |
105 | extern int sysctl_nr_trim_pages; |
106 | #endif |
107 | #ifdef CONFIG_BLOCK |
108 | extern int blk_iopoll_enabled; |
109 | #endif |
110 | |
111 | /* Constants used for minimum and maximum */ |
112 | #ifdef CONFIG_LOCKUP_DETECTOR |
113 | static int sixty = 60; |
114 | static int neg_one = -1; |
115 | #endif |
116 | |
117 | static int zero; |
118 | static int __maybe_unused one = 1; |
119 | static int __maybe_unused two = 2; |
120 | static unsigned long one_ul = 1; |
121 | static int one_hundred = 100; |
122 | #ifdef CONFIG_PRINTK |
123 | static int ten_thousand = 10000; |
124 | #endif |
125 | |
126 | /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */ |
127 | static unsigned long dirty_bytes_min = 2 * PAGE_SIZE; |
128 | |
129 | /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */ |
130 | static int maxolduid = 65535; |
131 | static int minolduid; |
132 | static int min_percpu_pagelist_fract = 8; |
133 | |
134 | static int ngroups_max = NGROUPS_MAX; |
135 | |
136 | #ifdef CONFIG_INOTIFY_USER |
137 | #include <linux/inotify.h> |
138 | #endif |
139 | #ifdef CONFIG_SPARC |
140 | #include <asm/system.h> |
141 | #endif |
142 | |
143 | #ifdef CONFIG_SPARC64 |
144 | extern int sysctl_tsb_ratio; |
145 | #endif |
146 | |
147 | #ifdef __hppa__ |
148 | extern int pwrsw_enabled; |
149 | extern int unaligned_enabled; |
150 | #endif |
151 | |
152 | #ifdef CONFIG_S390 |
153 | #ifdef CONFIG_MATHEMU |
154 | extern int sysctl_ieee_emulation_warnings; |
155 | #endif |
156 | extern int sysctl_userprocess_debug; |
157 | extern int spin_retry; |
158 | #endif |
159 | |
160 | #ifdef CONFIG_IA64 |
161 | extern int no_unaligned_warning; |
162 | extern int unaligned_dump_stack; |
163 | #endif |
164 | |
165 | #ifdef CONFIG_PROC_SYSCTL |
166 | static int proc_do_cad_pid(struct ctl_table *table, int write, |
167 | void __user *buffer, size_t *lenp, loff_t *ppos); |
168 | static int proc_taint(struct ctl_table *table, int write, |
169 | void __user *buffer, size_t *lenp, loff_t *ppos); |
170 | #endif |
171 | |
172 | #ifdef CONFIG_MAGIC_SYSRQ |
173 | /* Note: sysrq code uses it's own private copy */ |
174 | static int __sysrq_enabled = SYSRQ_DEFAULT_ENABLE; |
175 | |
176 | static int sysrq_sysctl_handler(ctl_table *table, int write, |
177 | void __user *buffer, size_t *lenp, |
178 | loff_t *ppos) |
179 | { |
180 | int error; |
181 | |
182 | error = proc_dointvec(table, write, buffer, lenp, ppos); |
183 | if (error) |
184 | return error; |
185 | |
186 | if (write) |
187 | sysrq_toggle_support(__sysrq_enabled); |
188 | |
189 | return 0; |
190 | } |
191 | |
192 | #endif |
193 | |
194 | static struct ctl_table root_table[]; |
195 | static struct ctl_table_root sysctl_table_root; |
196 | static struct ctl_table_header root_table_header = { |
197 | {{.count = 1, |
198 | .ctl_table = root_table, |
199 | .ctl_entry = LIST_HEAD_INIT(sysctl_table_root.default_set.list),}}, |
200 | .root = &sysctl_table_root, |
201 | .set = &sysctl_table_root.default_set, |
202 | }; |
203 | static struct ctl_table_root sysctl_table_root = { |
204 | .root_list = LIST_HEAD_INIT(sysctl_table_root.root_list), |
205 | .default_set.list = LIST_HEAD_INIT(root_table_header.ctl_entry), |
206 | }; |
207 | |
208 | static struct ctl_table kern_table[]; |
209 | static struct ctl_table vm_table[]; |
210 | static struct ctl_table fs_table[]; |
211 | static struct ctl_table debug_table[]; |
212 | static struct ctl_table dev_table[]; |
213 | extern struct ctl_table random_table[]; |
214 | #ifdef CONFIG_EPOLL |
215 | extern struct ctl_table epoll_table[]; |
216 | #endif |
217 | |
218 | #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT |
219 | int sysctl_legacy_va_layout; |
220 | #endif |
221 | |
222 | /* The default sysctl tables: */ |
223 | |
224 | static struct ctl_table root_table[] = { |
225 | { |
226 | .procname = "kernel", |
227 | .mode = 0555, |
228 | .child = kern_table, |
229 | }, |
230 | { |
231 | .procname = "vm", |
232 | .mode = 0555, |
233 | .child = vm_table, |
234 | }, |
235 | { |
236 | .procname = "fs", |
237 | .mode = 0555, |
238 | .child = fs_table, |
239 | }, |
240 | { |
241 | .procname = "debug", |
242 | .mode = 0555, |
243 | .child = debug_table, |
244 | }, |
245 | { |
246 | .procname = "dev", |
247 | .mode = 0555, |
248 | .child = dev_table, |
249 | }, |
250 | { } |
251 | }; |
252 | |
253 | #ifdef CONFIG_SCHED_DEBUG |
254 | static int min_sched_granularity_ns = 100000; /* 100 usecs */ |
255 | static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */ |
256 | static int min_wakeup_granularity_ns; /* 0 usecs */ |
257 | static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */ |
258 | static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE; |
259 | static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1; |
260 | #endif |
261 | |
262 | #ifdef CONFIG_COMPACTION |
263 | static int min_extfrag_threshold; |
264 | static int max_extfrag_threshold = 1000; |
265 | #endif |
266 | |
267 | static struct ctl_table kern_table[] = { |
268 | { |
269 | .procname = "sched_child_runs_first", |
270 | .data = &sysctl_sched_child_runs_first, |
271 | .maxlen = sizeof(unsigned int), |
272 | .mode = 0644, |
273 | .proc_handler = proc_dointvec, |
274 | }, |
275 | #ifdef CONFIG_SCHED_DEBUG |
276 | { |
277 | .procname = "sched_min_granularity_ns", |
278 | .data = &sysctl_sched_min_granularity, |
279 | .maxlen = sizeof(unsigned int), |
280 | .mode = 0644, |
281 | .proc_handler = sched_proc_update_handler, |
282 | .extra1 = &min_sched_granularity_ns, |
283 | .extra2 = &max_sched_granularity_ns, |
284 | }, |
285 | { |
286 | .procname = "sched_latency_ns", |
287 | .data = &sysctl_sched_latency, |
288 | .maxlen = sizeof(unsigned int), |
289 | .mode = 0644, |
290 | .proc_handler = sched_proc_update_handler, |
291 | .extra1 = &min_sched_granularity_ns, |
292 | .extra2 = &max_sched_granularity_ns, |
293 | }, |
294 | { |
295 | .procname = "sched_wakeup_granularity_ns", |
296 | .data = &sysctl_sched_wakeup_granularity, |
297 | .maxlen = sizeof(unsigned int), |
298 | .mode = 0644, |
299 | .proc_handler = sched_proc_update_handler, |
300 | .extra1 = &min_wakeup_granularity_ns, |
301 | .extra2 = &max_wakeup_granularity_ns, |
302 | }, |
303 | { |
304 | .procname = "sched_tunable_scaling", |
305 | .data = &sysctl_sched_tunable_scaling, |
306 | .maxlen = sizeof(enum sched_tunable_scaling), |
307 | .mode = 0644, |
308 | .proc_handler = sched_proc_update_handler, |
309 | .extra1 = &min_sched_tunable_scaling, |
310 | .extra2 = &max_sched_tunable_scaling, |
311 | }, |
312 | { |
313 | .procname = "sched_migration_cost", |
314 | .data = &sysctl_sched_migration_cost, |
315 | .maxlen = sizeof(unsigned int), |
316 | .mode = 0644, |
317 | .proc_handler = proc_dointvec, |
318 | }, |
319 | { |
320 | .procname = "sched_nr_migrate", |
321 | .data = &sysctl_sched_nr_migrate, |
322 | .maxlen = sizeof(unsigned int), |
323 | .mode = 0644, |
324 | .proc_handler = proc_dointvec, |
325 | }, |
326 | { |
327 | .procname = "sched_time_avg", |
328 | .data = &sysctl_sched_time_avg, |
329 | .maxlen = sizeof(unsigned int), |
330 | .mode = 0644, |
331 | .proc_handler = proc_dointvec, |
332 | }, |
333 | { |
334 | .procname = "sched_shares_window", |
335 | .data = &sysctl_sched_shares_window, |
336 | .maxlen = sizeof(unsigned int), |
337 | .mode = 0644, |
338 | .proc_handler = proc_dointvec, |
339 | }, |
340 | { |
341 | .procname = "timer_migration", |
342 | .data = &sysctl_timer_migration, |
343 | .maxlen = sizeof(unsigned int), |
344 | .mode = 0644, |
345 | .proc_handler = proc_dointvec_minmax, |
346 | .extra1 = &zero, |
347 | .extra2 = &one, |
348 | }, |
349 | #endif |
350 | { |
351 | .procname = "sched_rt_period_us", |
352 | .data = &sysctl_sched_rt_period, |
353 | .maxlen = sizeof(unsigned int), |
354 | .mode = 0644, |
355 | .proc_handler = sched_rt_handler, |
356 | }, |
357 | { |
358 | .procname = "sched_rt_runtime_us", |
359 | .data = &sysctl_sched_rt_runtime, |
360 | .maxlen = sizeof(int), |
361 | .mode = 0644, |
362 | .proc_handler = sched_rt_handler, |
363 | }, |
364 | { |
365 | .procname = "sched_compat_yield", |
366 | .data = &sysctl_sched_compat_yield, |
367 | .maxlen = sizeof(unsigned int), |
368 | .mode = 0644, |
369 | .proc_handler = proc_dointvec, |
370 | }, |
371 | #ifdef CONFIG_SCHED_AUTOGROUP |
372 | { |
373 | .procname = "sched_autogroup_enabled", |
374 | .data = &sysctl_sched_autogroup_enabled, |
375 | .maxlen = sizeof(unsigned int), |
376 | .mode = 0644, |
377 | .proc_handler = proc_dointvec, |
378 | .extra1 = &zero, |
379 | .extra2 = &one, |
380 | }, |
381 | #endif |
382 | #ifdef CONFIG_PROVE_LOCKING |
383 | { |
384 | .procname = "prove_locking", |
385 | .data = &prove_locking, |
386 | .maxlen = sizeof(int), |
387 | .mode = 0644, |
388 | .proc_handler = proc_dointvec, |
389 | }, |
390 | #endif |
391 | #ifdef CONFIG_LOCK_STAT |
392 | { |
393 | .procname = "lock_stat", |
394 | .data = &lock_stat, |
395 | .maxlen = sizeof(int), |
396 | .mode = 0644, |
397 | .proc_handler = proc_dointvec, |
398 | }, |
399 | #endif |
400 | { |
401 | .procname = "panic", |
402 | .data = &panic_timeout, |
403 | .maxlen = sizeof(int), |
404 | .mode = 0644, |
405 | .proc_handler = proc_dointvec, |
406 | }, |
407 | { |
408 | .procname = "core_uses_pid", |
409 | .data = &core_uses_pid, |
410 | .maxlen = sizeof(int), |
411 | .mode = 0644, |
412 | .proc_handler = proc_dointvec, |
413 | }, |
414 | { |
415 | .procname = "core_pattern", |
416 | .data = core_pattern, |
417 | .maxlen = CORENAME_MAX_SIZE, |
418 | .mode = 0644, |
419 | .proc_handler = proc_dostring, |
420 | }, |
421 | { |
422 | .procname = "core_pipe_limit", |
423 | .data = &core_pipe_limit, |
424 | .maxlen = sizeof(unsigned int), |
425 | .mode = 0644, |
426 | .proc_handler = proc_dointvec, |
427 | }, |
428 | #ifdef CONFIG_PROC_SYSCTL |
429 | { |
430 | .procname = "tainted", |
431 | .maxlen = sizeof(long), |
432 | .mode = 0644, |
433 | .proc_handler = proc_taint, |
434 | }, |
435 | #endif |
436 | #ifdef CONFIG_LATENCYTOP |
437 | { |
438 | .procname = "latencytop", |
439 | .data = &latencytop_enabled, |
440 | .maxlen = sizeof(int), |
441 | .mode = 0644, |
442 | .proc_handler = proc_dointvec, |
443 | }, |
444 | #endif |
445 | #ifdef CONFIG_BLK_DEV_INITRD |
446 | { |
447 | .procname = "real-root-dev", |
448 | .data = &real_root_dev, |
449 | .maxlen = sizeof(int), |
450 | .mode = 0644, |
451 | .proc_handler = proc_dointvec, |
452 | }, |
453 | #endif |
454 | { |
455 | .procname = "print-fatal-signals", |
456 | .data = &print_fatal_signals, |
457 | .maxlen = sizeof(int), |
458 | .mode = 0644, |
459 | .proc_handler = proc_dointvec, |
460 | }, |
461 | #ifdef CONFIG_SPARC |
462 | { |
463 | .procname = "reboot-cmd", |
464 | .data = reboot_command, |
465 | .maxlen = 256, |
466 | .mode = 0644, |
467 | .proc_handler = proc_dostring, |
468 | }, |
469 | { |
470 | .procname = "stop-a", |
471 | .data = &stop_a_enabled, |
472 | .maxlen = sizeof (int), |
473 | .mode = 0644, |
474 | .proc_handler = proc_dointvec, |
475 | }, |
476 | { |
477 | .procname = "scons-poweroff", |
478 | .data = &scons_pwroff, |
479 | .maxlen = sizeof (int), |
480 | .mode = 0644, |
481 | .proc_handler = proc_dointvec, |
482 | }, |
483 | #endif |
484 | #ifdef CONFIG_SPARC64 |
485 | { |
486 | .procname = "tsb-ratio", |
487 | .data = &sysctl_tsb_ratio, |
488 | .maxlen = sizeof (int), |
489 | .mode = 0644, |
490 | .proc_handler = proc_dointvec, |
491 | }, |
492 | #endif |
493 | #ifdef __hppa__ |
494 | { |
495 | .procname = "soft-power", |
496 | .data = &pwrsw_enabled, |
497 | .maxlen = sizeof (int), |
498 | .mode = 0644, |
499 | .proc_handler = proc_dointvec, |
500 | }, |
501 | { |
502 | .procname = "unaligned-trap", |
503 | .data = &unaligned_enabled, |
504 | .maxlen = sizeof (int), |
505 | .mode = 0644, |
506 | .proc_handler = proc_dointvec, |
507 | }, |
508 | #endif |
509 | { |
510 | .procname = "ctrl-alt-del", |
511 | .data = &C_A_D, |
512 | .maxlen = sizeof(int), |
513 | .mode = 0644, |
514 | .proc_handler = proc_dointvec, |
515 | }, |
516 | #ifdef CONFIG_FUNCTION_TRACER |
517 | { |
518 | .procname = "ftrace_enabled", |
519 | .data = &ftrace_enabled, |
520 | .maxlen = sizeof(int), |
521 | .mode = 0644, |
522 | .proc_handler = ftrace_enable_sysctl, |
523 | }, |
524 | #endif |
525 | #ifdef CONFIG_STACK_TRACER |
526 | { |
527 | .procname = "stack_tracer_enabled", |
528 | .data = &stack_tracer_enabled, |
529 | .maxlen = sizeof(int), |
530 | .mode = 0644, |
531 | .proc_handler = stack_trace_sysctl, |
532 | }, |
533 | #endif |
534 | #ifdef CONFIG_TRACING |
535 | { |
536 | .procname = "ftrace_dump_on_oops", |
537 | .data = &ftrace_dump_on_oops, |
538 | .maxlen = sizeof(int), |
539 | .mode = 0644, |
540 | .proc_handler = proc_dointvec, |
541 | }, |
542 | #endif |
543 | #ifdef CONFIG_MODULES |
544 | { |
545 | .procname = "modprobe", |
546 | .data = &modprobe_path, |
547 | .maxlen = KMOD_PATH_LEN, |
548 | .mode = 0644, |
549 | .proc_handler = proc_dostring, |
550 | }, |
551 | { |
552 | .procname = "modules_disabled", |
553 | .data = &modules_disabled, |
554 | .maxlen = sizeof(int), |
555 | .mode = 0644, |
556 | /* only handle a transition from default "0" to "1" */ |
557 | .proc_handler = proc_dointvec_minmax, |
558 | .extra1 = &one, |
559 | .extra2 = &one, |
560 | }, |
561 | #endif |
562 | #ifdef CONFIG_HOTPLUG |
563 | { |
564 | .procname = "hotplug", |
565 | .data = &uevent_helper, |
566 | .maxlen = UEVENT_HELPER_PATH_LEN, |
567 | .mode = 0644, |
568 | .proc_handler = proc_dostring, |
569 | }, |
570 | #endif |
571 | #ifdef CONFIG_CHR_DEV_SG |
572 | { |
573 | .procname = "sg-big-buff", |
574 | .data = &sg_big_buff, |
575 | .maxlen = sizeof (int), |
576 | .mode = 0444, |
577 | .proc_handler = proc_dointvec, |
578 | }, |
579 | #endif |
580 | #ifdef CONFIG_BSD_PROCESS_ACCT |
581 | { |
582 | .procname = "acct", |
583 | .data = &acct_parm, |
584 | .maxlen = 3*sizeof(int), |
585 | .mode = 0644, |
586 | .proc_handler = proc_dointvec, |
587 | }, |
588 | #endif |
589 | #ifdef CONFIG_MAGIC_SYSRQ |
590 | { |
591 | .procname = "sysrq", |
592 | .data = &__sysrq_enabled, |
593 | .maxlen = sizeof (int), |
594 | .mode = 0644, |
595 | .proc_handler = sysrq_sysctl_handler, |
596 | }, |
597 | #endif |
598 | #ifdef CONFIG_PROC_SYSCTL |
599 | { |
600 | .procname = "cad_pid", |
601 | .data = NULL, |
602 | .maxlen = sizeof (int), |
603 | .mode = 0600, |
604 | .proc_handler = proc_do_cad_pid, |
605 | }, |
606 | #endif |
607 | { |
608 | .procname = "threads-max", |
609 | .data = &max_threads, |
610 | .maxlen = sizeof(int), |
611 | .mode = 0644, |
612 | .proc_handler = proc_dointvec, |
613 | }, |
614 | { |
615 | .procname = "random", |
616 | .mode = 0555, |
617 | .child = random_table, |
618 | }, |
619 | { |
620 | .procname = "overflowuid", |
621 | .data = &overflowuid, |
622 | .maxlen = sizeof(int), |
623 | .mode = 0644, |
624 | .proc_handler = proc_dointvec_minmax, |
625 | .extra1 = &minolduid, |
626 | .extra2 = &maxolduid, |
627 | }, |
628 | { |
629 | .procname = "overflowgid", |
630 | .data = &overflowgid, |
631 | .maxlen = sizeof(int), |
632 | .mode = 0644, |
633 | .proc_handler = proc_dointvec_minmax, |
634 | .extra1 = &minolduid, |
635 | .extra2 = &maxolduid, |
636 | }, |
637 | #ifdef CONFIG_S390 |
638 | #ifdef CONFIG_MATHEMU |
639 | { |
640 | .procname = "ieee_emulation_warnings", |
641 | .data = &sysctl_ieee_emulation_warnings, |
642 | .maxlen = sizeof(int), |
643 | .mode = 0644, |
644 | .proc_handler = proc_dointvec, |
645 | }, |
646 | #endif |
647 | { |
648 | .procname = "userprocess_debug", |
649 | .data = &show_unhandled_signals, |
650 | .maxlen = sizeof(int), |
651 | .mode = 0644, |
652 | .proc_handler = proc_dointvec, |
653 | }, |
654 | #endif |
655 | { |
656 | .procname = "pid_max", |
657 | .data = &pid_max, |
658 | .maxlen = sizeof (int), |
659 | .mode = 0644, |
660 | .proc_handler = proc_dointvec_minmax, |
661 | .extra1 = &pid_max_min, |
662 | .extra2 = &pid_max_max, |
663 | }, |
664 | { |
665 | .procname = "panic_on_oops", |
666 | .data = &panic_on_oops, |
667 | .maxlen = sizeof(int), |
668 | .mode = 0644, |
669 | .proc_handler = proc_dointvec, |
670 | }, |
671 | #if defined CONFIG_PRINTK |
672 | { |
673 | .procname = "printk", |
674 | .data = &console_loglevel, |
675 | .maxlen = 4*sizeof(int), |
676 | .mode = 0644, |
677 | .proc_handler = proc_dointvec, |
678 | }, |
679 | { |
680 | .procname = "printk_ratelimit", |
681 | .data = &printk_ratelimit_state.interval, |
682 | .maxlen = sizeof(int), |
683 | .mode = 0644, |
684 | .proc_handler = proc_dointvec_jiffies, |
685 | }, |
686 | { |
687 | .procname = "printk_ratelimit_burst", |
688 | .data = &printk_ratelimit_state.burst, |
689 | .maxlen = sizeof(int), |
690 | .mode = 0644, |
691 | .proc_handler = proc_dointvec, |
692 | }, |
693 | { |
694 | .procname = "printk_delay", |
695 | .data = &printk_delay_msec, |
696 | .maxlen = sizeof(int), |
697 | .mode = 0644, |
698 | .proc_handler = proc_dointvec_minmax, |
699 | .extra1 = &zero, |
700 | .extra2 = &ten_thousand, |
701 | }, |
702 | { |
703 | .procname = "dmesg_restrict", |
704 | .data = &dmesg_restrict, |
705 | .maxlen = sizeof(int), |
706 | .mode = 0644, |
707 | .proc_handler = proc_dointvec_minmax, |
708 | .extra1 = &zero, |
709 | .extra2 = &one, |
710 | }, |
711 | { |
712 | .procname = "kptr_restrict", |
713 | .data = &kptr_restrict, |
714 | .maxlen = sizeof(int), |
715 | .mode = 0644, |
716 | .proc_handler = proc_dointvec_minmax, |
717 | .extra1 = &zero, |
718 | .extra2 = &two, |
719 | }, |
720 | #endif |
721 | { |
722 | .procname = "ngroups_max", |
723 | .data = &ngroups_max, |
724 | .maxlen = sizeof (int), |
725 | .mode = 0444, |
726 | .proc_handler = proc_dointvec, |
727 | }, |
728 | #if defined(CONFIG_LOCKUP_DETECTOR) |
729 | { |
730 | .procname = "watchdog", |
731 | .data = &watchdog_enabled, |
732 | .maxlen = sizeof (int), |
733 | .mode = 0644, |
734 | .proc_handler = proc_dowatchdog_enabled, |
735 | }, |
736 | { |
737 | .procname = "watchdog_thresh", |
738 | .data = &softlockup_thresh, |
739 | .maxlen = sizeof(int), |
740 | .mode = 0644, |
741 | .proc_handler = proc_dowatchdog_thresh, |
742 | .extra1 = &neg_one, |
743 | .extra2 = &sixty, |
744 | }, |
745 | { |
746 | .procname = "softlockup_panic", |
747 | .data = &softlockup_panic, |
748 | .maxlen = sizeof(int), |
749 | .mode = 0644, |
750 | .proc_handler = proc_dointvec_minmax, |
751 | .extra1 = &zero, |
752 | .extra2 = &one, |
753 | }, |
754 | { |
755 | .procname = "nmi_watchdog", |
756 | .data = &watchdog_enabled, |
757 | .maxlen = sizeof (int), |
758 | .mode = 0644, |
759 | .proc_handler = proc_dowatchdog_enabled, |
760 | }, |
761 | #endif |
762 | #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86) |
763 | { |
764 | .procname = "unknown_nmi_panic", |
765 | .data = &unknown_nmi_panic, |
766 | .maxlen = sizeof (int), |
767 | .mode = 0644, |
768 | .proc_handler = proc_dointvec, |
769 | }, |
770 | #endif |
771 | #if defined(CONFIG_X86) |
772 | { |
773 | .procname = "panic_on_unrecovered_nmi", |
774 | .data = &panic_on_unrecovered_nmi, |
775 | .maxlen = sizeof(int), |
776 | .mode = 0644, |
777 | .proc_handler = proc_dointvec, |
778 | }, |
779 | { |
780 | .procname = "panic_on_io_nmi", |
781 | .data = &panic_on_io_nmi, |
782 | .maxlen = sizeof(int), |
783 | .mode = 0644, |
784 | .proc_handler = proc_dointvec, |
785 | }, |
786 | { |
787 | .procname = "bootloader_type", |
788 | .data = &bootloader_type, |
789 | .maxlen = sizeof (int), |
790 | .mode = 0444, |
791 | .proc_handler = proc_dointvec, |
792 | }, |
793 | { |
794 | .procname = "bootloader_version", |
795 | .data = &bootloader_version, |
796 | .maxlen = sizeof (int), |
797 | .mode = 0444, |
798 | .proc_handler = proc_dointvec, |
799 | }, |
800 | { |
801 | .procname = "kstack_depth_to_print", |
802 | .data = &kstack_depth_to_print, |
803 | .maxlen = sizeof(int), |
804 | .mode = 0644, |
805 | .proc_handler = proc_dointvec, |
806 | }, |
807 | { |
808 | .procname = "io_delay_type", |
809 | .data = &io_delay_type, |
810 | .maxlen = sizeof(int), |
811 | .mode = 0644, |
812 | .proc_handler = proc_dointvec, |
813 | }, |
814 | #endif |
815 | #if defined(CONFIG_MMU) |
816 | { |
817 | .procname = "randomize_va_space", |
818 | .data = &randomize_va_space, |
819 | .maxlen = sizeof(int), |
820 | .mode = 0644, |
821 | .proc_handler = proc_dointvec, |
822 | }, |
823 | #endif |
824 | #if defined(CONFIG_S390) && defined(CONFIG_SMP) |
825 | { |
826 | .procname = "spin_retry", |
827 | .data = &spin_retry, |
828 | .maxlen = sizeof (int), |
829 | .mode = 0644, |
830 | .proc_handler = proc_dointvec, |
831 | }, |
832 | #endif |
833 | #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86) |
834 | { |
835 | .procname = "acpi_video_flags", |
836 | .data = &acpi_realmode_flags, |
837 | .maxlen = sizeof (unsigned long), |
838 | .mode = 0644, |
839 | .proc_handler = proc_doulongvec_minmax, |
840 | }, |
841 | #endif |
842 | #ifdef CONFIG_IA64 |
843 | { |
844 | .procname = "ignore-unaligned-usertrap", |
845 | .data = &no_unaligned_warning, |
846 | .maxlen = sizeof (int), |
847 | .mode = 0644, |
848 | .proc_handler = proc_dointvec, |
849 | }, |
850 | { |
851 | .procname = "unaligned-dump-stack", |
852 | .data = &unaligned_dump_stack, |
853 | .maxlen = sizeof (int), |
854 | .mode = 0644, |
855 | .proc_handler = proc_dointvec, |
856 | }, |
857 | #endif |
858 | #ifdef CONFIG_DETECT_HUNG_TASK |
859 | { |
860 | .procname = "hung_task_panic", |
861 | .data = &sysctl_hung_task_panic, |
862 | .maxlen = sizeof(int), |
863 | .mode = 0644, |
864 | .proc_handler = proc_dointvec_minmax, |
865 | .extra1 = &zero, |
866 | .extra2 = &one, |
867 | }, |
868 | { |
869 | .procname = "hung_task_check_count", |
870 | .data = &sysctl_hung_task_check_count, |
871 | .maxlen = sizeof(unsigned long), |
872 | .mode = 0644, |
873 | .proc_handler = proc_doulongvec_minmax, |
874 | }, |
875 | { |
876 | .procname = "hung_task_timeout_secs", |
877 | .data = &sysctl_hung_task_timeout_secs, |
878 | .maxlen = sizeof(unsigned long), |
879 | .mode = 0644, |
880 | .proc_handler = proc_dohung_task_timeout_secs, |
881 | }, |
882 | { |
883 | .procname = "hung_task_warnings", |
884 | .data = &sysctl_hung_task_warnings, |
885 | .maxlen = sizeof(unsigned long), |
886 | .mode = 0644, |
887 | .proc_handler = proc_doulongvec_minmax, |
888 | }, |
889 | #endif |
890 | #ifdef CONFIG_COMPAT |
891 | { |
892 | .procname = "compat-log", |
893 | .data = &compat_log, |
894 | .maxlen = sizeof (int), |
895 | .mode = 0644, |
896 | .proc_handler = proc_dointvec, |
897 | }, |
898 | #endif |
899 | #ifdef CONFIG_RT_MUTEXES |
900 | { |
901 | .procname = "max_lock_depth", |
902 | .data = &max_lock_depth, |
903 | .maxlen = sizeof(int), |
904 | .mode = 0644, |
905 | .proc_handler = proc_dointvec, |
906 | }, |
907 | #endif |
908 | { |
909 | .procname = "poweroff_cmd", |
910 | .data = &poweroff_cmd, |
911 | .maxlen = POWEROFF_CMD_PATH_LEN, |
912 | .mode = 0644, |
913 | .proc_handler = proc_dostring, |
914 | }, |
915 | #ifdef CONFIG_KEYS |
916 | { |
917 | .procname = "keys", |
918 | .mode = 0555, |
919 | .child = key_sysctls, |
920 | }, |
921 | #endif |
922 | #ifdef CONFIG_RCU_TORTURE_TEST |
923 | { |
924 | .procname = "rcutorture_runnable", |
925 | .data = &rcutorture_runnable, |
926 | .maxlen = sizeof(int), |
927 | .mode = 0644, |
928 | .proc_handler = proc_dointvec, |
929 | }, |
930 | #endif |
931 | #ifdef CONFIG_PERF_EVENTS |
932 | { |
933 | .procname = "perf_event_paranoid", |
934 | .data = &sysctl_perf_event_paranoid, |
935 | .maxlen = sizeof(sysctl_perf_event_paranoid), |
936 | .mode = 0644, |
937 | .proc_handler = proc_dointvec, |
938 | }, |
939 | { |
940 | .procname = "perf_event_mlock_kb", |
941 | .data = &sysctl_perf_event_mlock, |
942 | .maxlen = sizeof(sysctl_perf_event_mlock), |
943 | .mode = 0644, |
944 | .proc_handler = proc_dointvec, |
945 | }, |
946 | { |
947 | .procname = "perf_event_max_sample_rate", |
948 | .data = &sysctl_perf_event_sample_rate, |
949 | .maxlen = sizeof(sysctl_perf_event_sample_rate), |
950 | .mode = 0644, |
951 | .proc_handler = proc_dointvec, |
952 | }, |
953 | #endif |
954 | #ifdef CONFIG_KMEMCHECK |
955 | { |
956 | .procname = "kmemcheck", |
957 | .data = &kmemcheck_enabled, |
958 | .maxlen = sizeof(int), |
959 | .mode = 0644, |
960 | .proc_handler = proc_dointvec, |
961 | }, |
962 | #endif |
963 | #ifdef CONFIG_BLOCK |
964 | { |
965 | .procname = "blk_iopoll", |
966 | .data = &blk_iopoll_enabled, |
967 | .maxlen = sizeof(int), |
968 | .mode = 0644, |
969 | .proc_handler = proc_dointvec, |
970 | }, |
971 | #endif |
972 | { } |
973 | }; |
974 | |
975 | static struct ctl_table vm_table[] = { |
976 | { |
977 | .procname = "overcommit_memory", |
978 | .data = &sysctl_overcommit_memory, |
979 | .maxlen = sizeof(sysctl_overcommit_memory), |
980 | .mode = 0644, |
981 | .proc_handler = proc_dointvec, |
982 | }, |
983 | { |
984 | .procname = "panic_on_oom", |
985 | .data = &sysctl_panic_on_oom, |
986 | .maxlen = sizeof(sysctl_panic_on_oom), |
987 | .mode = 0644, |
988 | .proc_handler = proc_dointvec, |
989 | }, |
990 | { |
991 | .procname = "oom_kill_allocating_task", |
992 | .data = &sysctl_oom_kill_allocating_task, |
993 | .maxlen = sizeof(sysctl_oom_kill_allocating_task), |
994 | .mode = 0644, |
995 | .proc_handler = proc_dointvec, |
996 | }, |
997 | { |
998 | .procname = "oom_dump_tasks", |
999 | .data = &sysctl_oom_dump_tasks, |
1000 | .maxlen = sizeof(sysctl_oom_dump_tasks), |
1001 | .mode = 0644, |
1002 | .proc_handler = proc_dointvec, |
1003 | }, |
1004 | { |
1005 | .procname = "overcommit_ratio", |
1006 | .data = &sysctl_overcommit_ratio, |
1007 | .maxlen = sizeof(sysctl_overcommit_ratio), |
1008 | .mode = 0644, |
1009 | .proc_handler = proc_dointvec, |
1010 | }, |
1011 | { |
1012 | .procname = "page-cluster", |
1013 | .data = &page_cluster, |
1014 | .maxlen = sizeof(int), |
1015 | .mode = 0644, |
1016 | .proc_handler = proc_dointvec, |
1017 | }, |
1018 | { |
1019 | .procname = "dirty_background_ratio", |
1020 | .data = &dirty_background_ratio, |
1021 | .maxlen = sizeof(dirty_background_ratio), |
1022 | .mode = 0644, |
1023 | .proc_handler = dirty_background_ratio_handler, |
1024 | .extra1 = &zero, |
1025 | .extra2 = &one_hundred, |
1026 | }, |
1027 | { |
1028 | .procname = "dirty_background_bytes", |
1029 | .data = &dirty_background_bytes, |
1030 | .maxlen = sizeof(dirty_background_bytes), |
1031 | .mode = 0644, |
1032 | .proc_handler = dirty_background_bytes_handler, |
1033 | .extra1 = &one_ul, |
1034 | }, |
1035 | { |
1036 | .procname = "dirty_ratio", |
1037 | .data = &vm_dirty_ratio, |
1038 | .maxlen = sizeof(vm_dirty_ratio), |
1039 | .mode = 0644, |
1040 | .proc_handler = dirty_ratio_handler, |
1041 | .extra1 = &zero, |
1042 | .extra2 = &one_hundred, |
1043 | }, |
1044 | { |
1045 | .procname = "dirty_bytes", |
1046 | .data = &vm_dirty_bytes, |
1047 | .maxlen = sizeof(vm_dirty_bytes), |
1048 | .mode = 0644, |
1049 | .proc_handler = dirty_bytes_handler, |
1050 | .extra1 = &dirty_bytes_min, |
1051 | }, |
1052 | { |
1053 | .procname = "dirty_writeback_centisecs", |
1054 | .data = &dirty_writeback_interval, |
1055 | .maxlen = sizeof(dirty_writeback_interval), |
1056 | .mode = 0644, |
1057 | .proc_handler = dirty_writeback_centisecs_handler, |
1058 | }, |
1059 | { |
1060 | .procname = "dirty_expire_centisecs", |
1061 | .data = &dirty_expire_interval, |
1062 | .maxlen = sizeof(dirty_expire_interval), |
1063 | .mode = 0644, |
1064 | .proc_handler = proc_dointvec, |
1065 | }, |
1066 | { |
1067 | .procname = "nr_pdflush_threads", |
1068 | .data = &nr_pdflush_threads, |
1069 | .maxlen = sizeof nr_pdflush_threads, |
1070 | .mode = 0444 /* read-only*/, |
1071 | .proc_handler = proc_dointvec, |
1072 | }, |
1073 | { |
1074 | .procname = "swappiness", |
1075 | .data = &vm_swappiness, |
1076 | .maxlen = sizeof(vm_swappiness), |
1077 | .mode = 0644, |
1078 | .proc_handler = proc_dointvec_minmax, |
1079 | .extra1 = &zero, |
1080 | .extra2 = &one_hundred, |
1081 | }, |
1082 | #ifdef CONFIG_HUGETLB_PAGE |
1083 | { |
1084 | .procname = "nr_hugepages", |
1085 | .data = NULL, |
1086 | .maxlen = sizeof(unsigned long), |
1087 | .mode = 0644, |
1088 | .proc_handler = hugetlb_sysctl_handler, |
1089 | .extra1 = (void *)&hugetlb_zero, |
1090 | .extra2 = (void *)&hugetlb_infinity, |
1091 | }, |
1092 | #ifdef CONFIG_NUMA |
1093 | { |
1094 | .procname = "nr_hugepages_mempolicy", |
1095 | .data = NULL, |
1096 | .maxlen = sizeof(unsigned long), |
1097 | .mode = 0644, |
1098 | .proc_handler = &hugetlb_mempolicy_sysctl_handler, |
1099 | .extra1 = (void *)&hugetlb_zero, |
1100 | .extra2 = (void *)&hugetlb_infinity, |
1101 | }, |
1102 | #endif |
1103 | { |
1104 | .procname = "hugetlb_shm_group", |
1105 | .data = &sysctl_hugetlb_shm_group, |
1106 | .maxlen = sizeof(gid_t), |
1107 | .mode = 0644, |
1108 | .proc_handler = proc_dointvec, |
1109 | }, |
1110 | { |
1111 | .procname = "hugepages_treat_as_movable", |
1112 | .data = &hugepages_treat_as_movable, |
1113 | .maxlen = sizeof(int), |
1114 | .mode = 0644, |
1115 | .proc_handler = hugetlb_treat_movable_handler, |
1116 | }, |
1117 | { |
1118 | .procname = "nr_overcommit_hugepages", |
1119 | .data = NULL, |
1120 | .maxlen = sizeof(unsigned long), |
1121 | .mode = 0644, |
1122 | .proc_handler = hugetlb_overcommit_handler, |
1123 | .extra1 = (void *)&hugetlb_zero, |
1124 | .extra2 = (void *)&hugetlb_infinity, |
1125 | }, |
1126 | #endif |
1127 | { |
1128 | .procname = "lowmem_reserve_ratio", |
1129 | .data = &sysctl_lowmem_reserve_ratio, |
1130 | .maxlen = sizeof(sysctl_lowmem_reserve_ratio), |
1131 | .mode = 0644, |
1132 | .proc_handler = lowmem_reserve_ratio_sysctl_handler, |
1133 | }, |
1134 | { |
1135 | .procname = "drop_caches", |
1136 | .data = &sysctl_drop_caches, |
1137 | .maxlen = sizeof(int), |
1138 | .mode = 0644, |
1139 | .proc_handler = drop_caches_sysctl_handler, |
1140 | }, |
1141 | #ifdef CONFIG_COMPACTION |
1142 | { |
1143 | .procname = "compact_memory", |
1144 | .data = &sysctl_compact_memory, |
1145 | .maxlen = sizeof(int), |
1146 | .mode = 0200, |
1147 | .proc_handler = sysctl_compaction_handler, |
1148 | }, |
1149 | { |
1150 | .procname = "extfrag_threshold", |
1151 | .data = &sysctl_extfrag_threshold, |
1152 | .maxlen = sizeof(int), |
1153 | .mode = 0644, |
1154 | .proc_handler = sysctl_extfrag_handler, |
1155 | .extra1 = &min_extfrag_threshold, |
1156 | .extra2 = &max_extfrag_threshold, |
1157 | }, |
1158 | |
1159 | #endif /* CONFIG_COMPACTION */ |
1160 | { |
1161 | .procname = "min_free_kbytes", |
1162 | .data = &min_free_kbytes, |
1163 | .maxlen = sizeof(min_free_kbytes), |
1164 | .mode = 0644, |
1165 | .proc_handler = min_free_kbytes_sysctl_handler, |
1166 | .extra1 = &zero, |
1167 | }, |
1168 | { |
1169 | .procname = "percpu_pagelist_fraction", |
1170 | .data = &percpu_pagelist_fraction, |
1171 | .maxlen = sizeof(percpu_pagelist_fraction), |
1172 | .mode = 0644, |
1173 | .proc_handler = percpu_pagelist_fraction_sysctl_handler, |
1174 | .extra1 = &min_percpu_pagelist_fract, |
1175 | }, |
1176 | #ifdef CONFIG_MMU |
1177 | { |
1178 | .procname = "max_map_count", |
1179 | .data = &sysctl_max_map_count, |
1180 | .maxlen = sizeof(sysctl_max_map_count), |
1181 | .mode = 0644, |
1182 | .proc_handler = proc_dointvec_minmax, |
1183 | .extra1 = &zero, |
1184 | }, |
1185 | #else |
1186 | { |
1187 | .procname = "nr_trim_pages", |
1188 | .data = &sysctl_nr_trim_pages, |
1189 | .maxlen = sizeof(sysctl_nr_trim_pages), |
1190 | .mode = 0644, |
1191 | .proc_handler = proc_dointvec_minmax, |
1192 | .extra1 = &zero, |
1193 | }, |
1194 | #endif |
1195 | { |
1196 | .procname = "laptop_mode", |
1197 | .data = &laptop_mode, |
1198 | .maxlen = sizeof(laptop_mode), |
1199 | .mode = 0644, |
1200 | .proc_handler = proc_dointvec_jiffies, |
1201 | }, |
1202 | { |
1203 | .procname = "block_dump", |
1204 | .data = &block_dump, |
1205 | .maxlen = sizeof(block_dump), |
1206 | .mode = 0644, |
1207 | .proc_handler = proc_dointvec, |
1208 | .extra1 = &zero, |
1209 | }, |
1210 | { |
1211 | .procname = "vfs_cache_pressure", |
1212 | .data = &sysctl_vfs_cache_pressure, |
1213 | .maxlen = sizeof(sysctl_vfs_cache_pressure), |
1214 | .mode = 0644, |
1215 | .proc_handler = proc_dointvec, |
1216 | .extra1 = &zero, |
1217 | }, |
1218 | #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT |
1219 | { |
1220 | .procname = "legacy_va_layout", |
1221 | .data = &sysctl_legacy_va_layout, |
1222 | .maxlen = sizeof(sysctl_legacy_va_layout), |
1223 | .mode = 0644, |
1224 | .proc_handler = proc_dointvec, |
1225 | .extra1 = &zero, |
1226 | }, |
1227 | #endif |
1228 | #ifdef CONFIG_NUMA |
1229 | { |
1230 | .procname = "zone_reclaim_mode", |
1231 | .data = &zone_reclaim_mode, |
1232 | .maxlen = sizeof(zone_reclaim_mode), |
1233 | .mode = 0644, |
1234 | .proc_handler = proc_dointvec, |
1235 | .extra1 = &zero, |
1236 | }, |
1237 | { |
1238 | .procname = "min_unmapped_ratio", |
1239 | .data = &sysctl_min_unmapped_ratio, |
1240 | .maxlen = sizeof(sysctl_min_unmapped_ratio), |
1241 | .mode = 0644, |
1242 | .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler, |
1243 | .extra1 = &zero, |
1244 | .extra2 = &one_hundred, |
1245 | }, |
1246 | { |
1247 | .procname = "min_slab_ratio", |
1248 | .data = &sysctl_min_slab_ratio, |
1249 | .maxlen = sizeof(sysctl_min_slab_ratio), |
1250 | .mode = 0644, |
1251 | .proc_handler = sysctl_min_slab_ratio_sysctl_handler, |
1252 | .extra1 = &zero, |
1253 | .extra2 = &one_hundred, |
1254 | }, |
1255 | #endif |
1256 | #ifdef CONFIG_SMP |
1257 | { |
1258 | .procname = "stat_interval", |
1259 | .data = &sysctl_stat_interval, |
1260 | .maxlen = sizeof(sysctl_stat_interval), |
1261 | .mode = 0644, |
1262 | .proc_handler = proc_dointvec_jiffies, |
1263 | }, |
1264 | #endif |
1265 | #ifdef CONFIG_MMU |
1266 | { |
1267 | .procname = "mmap_min_addr", |
1268 | .data = &dac_mmap_min_addr, |
1269 | .maxlen = sizeof(unsigned long), |
1270 | .mode = 0644, |
1271 | .proc_handler = mmap_min_addr_handler, |
1272 | }, |
1273 | #endif |
1274 | #ifdef CONFIG_NUMA |
1275 | { |
1276 | .procname = "numa_zonelist_order", |
1277 | .data = &numa_zonelist_order, |
1278 | .maxlen = NUMA_ZONELIST_ORDER_LEN, |
1279 | .mode = 0644, |
1280 | .proc_handler = numa_zonelist_order_handler, |
1281 | }, |
1282 | #endif |
1283 | #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \ |
1284 | (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL)) |
1285 | { |
1286 | .procname = "vdso_enabled", |
1287 | .data = &vdso_enabled, |
1288 | .maxlen = sizeof(vdso_enabled), |
1289 | .mode = 0644, |
1290 | .proc_handler = proc_dointvec, |
1291 | .extra1 = &zero, |
1292 | }, |
1293 | #endif |
1294 | #ifdef CONFIG_HIGHMEM |
1295 | { |
1296 | .procname = "highmem_is_dirtyable", |
1297 | .data = &vm_highmem_is_dirtyable, |
1298 | .maxlen = sizeof(vm_highmem_is_dirtyable), |
1299 | .mode = 0644, |
1300 | .proc_handler = proc_dointvec_minmax, |
1301 | .extra1 = &zero, |
1302 | .extra2 = &one, |
1303 | }, |
1304 | #endif |
1305 | { |
1306 | .procname = "scan_unevictable_pages", |
1307 | .data = &scan_unevictable_pages, |
1308 | .maxlen = sizeof(scan_unevictable_pages), |
1309 | .mode = 0644, |
1310 | .proc_handler = scan_unevictable_handler, |
1311 | }, |
1312 | #ifdef CONFIG_MEMORY_FAILURE |
1313 | { |
1314 | .procname = "memory_failure_early_kill", |
1315 | .data = &sysctl_memory_failure_early_kill, |
1316 | .maxlen = sizeof(sysctl_memory_failure_early_kill), |
1317 | .mode = 0644, |
1318 | .proc_handler = proc_dointvec_minmax, |
1319 | .extra1 = &zero, |
1320 | .extra2 = &one, |
1321 | }, |
1322 | { |
1323 | .procname = "memory_failure_recovery", |
1324 | .data = &sysctl_memory_failure_recovery, |
1325 | .maxlen = sizeof(sysctl_memory_failure_recovery), |
1326 | .mode = 0644, |
1327 | .proc_handler = proc_dointvec_minmax, |
1328 | .extra1 = &zero, |
1329 | .extra2 = &one, |
1330 | }, |
1331 | #endif |
1332 | { } |
1333 | }; |
1334 | |
1335 | #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) |
1336 | static struct ctl_table binfmt_misc_table[] = { |
1337 | { } |
1338 | }; |
1339 | #endif |
1340 | |
1341 | static struct ctl_table fs_table[] = { |
1342 | { |
1343 | .procname = "inode-nr", |
1344 | .data = &inodes_stat, |
1345 | .maxlen = 2*sizeof(int), |
1346 | .mode = 0444, |
1347 | .proc_handler = proc_nr_inodes, |
1348 | }, |
1349 | { |
1350 | .procname = "inode-state", |
1351 | .data = &inodes_stat, |
1352 | .maxlen = 7*sizeof(int), |
1353 | .mode = 0444, |
1354 | .proc_handler = proc_nr_inodes, |
1355 | }, |
1356 | { |
1357 | .procname = "file-nr", |
1358 | .data = &files_stat, |
1359 | .maxlen = sizeof(files_stat), |
1360 | .mode = 0444, |
1361 | .proc_handler = proc_nr_files, |
1362 | }, |
1363 | { |
1364 | .procname = "file-max", |
1365 | .data = &files_stat.max_files, |
1366 | .maxlen = sizeof(files_stat.max_files), |
1367 | .mode = 0644, |
1368 | .proc_handler = proc_doulongvec_minmax, |
1369 | }, |
1370 | { |
1371 | .procname = "nr_open", |
1372 | .data = &sysctl_nr_open, |
1373 | .maxlen = sizeof(int), |
1374 | .mode = 0644, |
1375 | .proc_handler = proc_dointvec_minmax, |
1376 | .extra1 = &sysctl_nr_open_min, |
1377 | .extra2 = &sysctl_nr_open_max, |
1378 | }, |
1379 | { |
1380 | .procname = "dentry-state", |
1381 | .data = &dentry_stat, |
1382 | .maxlen = 6*sizeof(int), |
1383 | .mode = 0444, |
1384 | .proc_handler = proc_nr_dentry, |
1385 | }, |
1386 | { |
1387 | .procname = "overflowuid", |
1388 | .data = &fs_overflowuid, |
1389 | .maxlen = sizeof(int), |
1390 | .mode = 0644, |
1391 | .proc_handler = proc_dointvec_minmax, |
1392 | .extra1 = &minolduid, |
1393 | .extra2 = &maxolduid, |
1394 | }, |
1395 | { |
1396 | .procname = "overflowgid", |
1397 | .data = &fs_overflowgid, |
1398 | .maxlen = sizeof(int), |
1399 | .mode = 0644, |
1400 | .proc_handler = proc_dointvec_minmax, |
1401 | .extra1 = &minolduid, |
1402 | .extra2 = &maxolduid, |
1403 | }, |
1404 | #ifdef CONFIG_FILE_LOCKING |
1405 | { |
1406 | .procname = "leases-enable", |
1407 | .data = &leases_enable, |
1408 | .maxlen = sizeof(int), |
1409 | .mode = 0644, |
1410 | .proc_handler = proc_dointvec, |
1411 | }, |
1412 | #endif |
1413 | #ifdef CONFIG_DNOTIFY |
1414 | { |
1415 | .procname = "dir-notify-enable", |
1416 | .data = &dir_notify_enable, |
1417 | .maxlen = sizeof(int), |
1418 | .mode = 0644, |
1419 | .proc_handler = proc_dointvec, |
1420 | }, |
1421 | #endif |
1422 | #ifdef CONFIG_MMU |
1423 | #ifdef CONFIG_FILE_LOCKING |
1424 | { |
1425 | .procname = "lease-break-time", |
1426 | .data = &lease_break_time, |
1427 | .maxlen = sizeof(int), |
1428 | .mode = 0644, |
1429 | .proc_handler = proc_dointvec, |
1430 | }, |
1431 | #endif |
1432 | #ifdef CONFIG_AIO |
1433 | { |
1434 | .procname = "aio-nr", |
1435 | .data = &aio_nr, |
1436 | .maxlen = sizeof(aio_nr), |
1437 | .mode = 0444, |
1438 | .proc_handler = proc_doulongvec_minmax, |
1439 | }, |
1440 | { |
1441 | .procname = "aio-max-nr", |
1442 | .data = &aio_max_nr, |
1443 | .maxlen = sizeof(aio_max_nr), |
1444 | .mode = 0644, |
1445 | .proc_handler = proc_doulongvec_minmax, |
1446 | }, |
1447 | #endif /* CONFIG_AIO */ |
1448 | #ifdef CONFIG_INOTIFY_USER |
1449 | { |
1450 | .procname = "inotify", |
1451 | .mode = 0555, |
1452 | .child = inotify_table, |
1453 | }, |
1454 | #endif |
1455 | #ifdef CONFIG_EPOLL |
1456 | { |
1457 | .procname = "epoll", |
1458 | .mode = 0555, |
1459 | .child = epoll_table, |
1460 | }, |
1461 | #endif |
1462 | #endif |
1463 | { |
1464 | .procname = "suid_dumpable", |
1465 | .data = &suid_dumpable, |
1466 | .maxlen = sizeof(int), |
1467 | .mode = 0644, |
1468 | .proc_handler = proc_dointvec_minmax, |
1469 | .extra1 = &zero, |
1470 | .extra2 = &two, |
1471 | }, |
1472 | #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) |
1473 | { |
1474 | .procname = "binfmt_misc", |
1475 | .mode = 0555, |
1476 | .child = binfmt_misc_table, |
1477 | }, |
1478 | #endif |
1479 | { |
1480 | .procname = "pipe-max-size", |
1481 | .data = &pipe_max_size, |
1482 | .maxlen = sizeof(int), |
1483 | .mode = 0644, |
1484 | .proc_handler = &pipe_proc_fn, |
1485 | .extra1 = &pipe_min_size, |
1486 | }, |
1487 | { } |
1488 | }; |
1489 | |
1490 | static struct ctl_table debug_table[] = { |
1491 | #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_SPARC) || \ |
1492 | defined(CONFIG_S390) |
1493 | { |
1494 | .procname = "exception-trace", |
1495 | .data = &show_unhandled_signals, |
1496 | .maxlen = sizeof(int), |
1497 | .mode = 0644, |
1498 | .proc_handler = proc_dointvec |
1499 | }, |
1500 | #endif |
1501 | #if defined(CONFIG_OPTPROBES) |
1502 | { |
1503 | .procname = "kprobes-optimization", |
1504 | .data = &sysctl_kprobes_optimization, |
1505 | .maxlen = sizeof(int), |
1506 | .mode = 0644, |
1507 | .proc_handler = proc_kprobes_optimization_handler, |
1508 | .extra1 = &zero, |
1509 | .extra2 = &one, |
1510 | }, |
1511 | #endif |
1512 | { } |
1513 | }; |
1514 | |
1515 | static struct ctl_table dev_table[] = { |
1516 | { } |
1517 | }; |
1518 | |
1519 | static DEFINE_SPINLOCK(sysctl_lock); |
1520 | |
1521 | /* called under sysctl_lock */ |
1522 | static int use_table(struct ctl_table_header *p) |
1523 | { |
1524 | if (unlikely(p->unregistering)) |
1525 | return 0; |
1526 | p->used++; |
1527 | return 1; |
1528 | } |
1529 | |
1530 | /* called under sysctl_lock */ |
1531 | static void unuse_table(struct ctl_table_header *p) |
1532 | { |
1533 | if (!--p->used) |
1534 | if (unlikely(p->unregistering)) |
1535 | complete(p->unregistering); |
1536 | } |
1537 | |
1538 | /* called under sysctl_lock, will reacquire if has to wait */ |
1539 | static void start_unregistering(struct ctl_table_header *p) |
1540 | { |
1541 | /* |
1542 | * if p->used is 0, nobody will ever touch that entry again; |
1543 | * we'll eliminate all paths to it before dropping sysctl_lock |
1544 | */ |
1545 | if (unlikely(p->used)) { |
1546 | struct completion wait; |
1547 | init_completion(&wait); |
1548 | p->unregistering = &wait; |
1549 | spin_unlock(&sysctl_lock); |
1550 | wait_for_completion(&wait); |
1551 | spin_lock(&sysctl_lock); |
1552 | } else { |
1553 | /* anything non-NULL; we'll never dereference it */ |
1554 | p->unregistering = ERR_PTR(-EINVAL); |
1555 | } |
1556 | /* |
1557 | * do not remove from the list until nobody holds it; walking the |
1558 | * list in do_sysctl() relies on that. |
1559 | */ |
1560 | list_del_init(&p->ctl_entry); |
1561 | } |
1562 | |
1563 | void sysctl_head_get(struct ctl_table_header *head) |
1564 | { |
1565 | spin_lock(&sysctl_lock); |
1566 | head->count++; |
1567 | spin_unlock(&sysctl_lock); |
1568 | } |
1569 | |
1570 | static void free_head(struct rcu_head *rcu) |
1571 | { |
1572 | kfree(container_of(rcu, struct ctl_table_header, rcu)); |
1573 | } |
1574 | |
1575 | void sysctl_head_put(struct ctl_table_header *head) |
1576 | { |
1577 | spin_lock(&sysctl_lock); |
1578 | if (!--head->count) |
1579 | call_rcu(&head->rcu, free_head); |
1580 | spin_unlock(&sysctl_lock); |
1581 | } |
1582 | |
1583 | struct ctl_table_header *sysctl_head_grab(struct ctl_table_header *head) |
1584 | { |
1585 | if (!head) |
1586 | BUG(); |
1587 | spin_lock(&sysctl_lock); |
1588 | if (!use_table(head)) |
1589 | head = ERR_PTR(-ENOENT); |
1590 | spin_unlock(&sysctl_lock); |
1591 | return head; |
1592 | } |
1593 | |
1594 | void sysctl_head_finish(struct ctl_table_header *head) |
1595 | { |
1596 | if (!head) |
1597 | return; |
1598 | spin_lock(&sysctl_lock); |
1599 | unuse_table(head); |
1600 | spin_unlock(&sysctl_lock); |
1601 | } |
1602 | |
1603 | static struct ctl_table_set * |
1604 | lookup_header_set(struct ctl_table_root *root, struct nsproxy *namespaces) |
1605 | { |
1606 | struct ctl_table_set *set = &root->default_set; |
1607 | if (root->lookup) |
1608 | set = root->lookup(root, namespaces); |
1609 | return set; |
1610 | } |
1611 | |
1612 | static struct list_head * |
1613 | lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces) |
1614 | { |
1615 | struct ctl_table_set *set = lookup_header_set(root, namespaces); |
1616 | return &set->list; |
1617 | } |
1618 | |
1619 | struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces, |
1620 | struct ctl_table_header *prev) |
1621 | { |
1622 | struct ctl_table_root *root; |
1623 | struct list_head *header_list; |
1624 | struct ctl_table_header *head; |
1625 | struct list_head *tmp; |
1626 | |
1627 | spin_lock(&sysctl_lock); |
1628 | if (prev) { |
1629 | head = prev; |
1630 | tmp = &prev->ctl_entry; |
1631 | unuse_table(prev); |
1632 | goto next; |
1633 | } |
1634 | tmp = &root_table_header.ctl_entry; |
1635 | for (;;) { |
1636 | head = list_entry(tmp, struct ctl_table_header, ctl_entry); |
1637 | |
1638 | if (!use_table(head)) |
1639 | goto next; |
1640 | spin_unlock(&sysctl_lock); |
1641 | return head; |
1642 | next: |
1643 | root = head->root; |
1644 | tmp = tmp->next; |
1645 | header_list = lookup_header_list(root, namespaces); |
1646 | if (tmp != header_list) |
1647 | continue; |
1648 | |
1649 | do { |
1650 | root = list_entry(root->root_list.next, |
1651 | struct ctl_table_root, root_list); |
1652 | if (root == &sysctl_table_root) |
1653 | goto out; |
1654 | header_list = lookup_header_list(root, namespaces); |
1655 | } while (list_empty(header_list)); |
1656 | tmp = header_list->next; |
1657 | } |
1658 | out: |
1659 | spin_unlock(&sysctl_lock); |
1660 | return NULL; |
1661 | } |
1662 | |
1663 | struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev) |
1664 | { |
1665 | return __sysctl_head_next(current->nsproxy, prev); |
1666 | } |
1667 | |
1668 | void register_sysctl_root(struct ctl_table_root *root) |
1669 | { |
1670 | spin_lock(&sysctl_lock); |
1671 | list_add_tail(&root->root_list, &sysctl_table_root.root_list); |
1672 | spin_unlock(&sysctl_lock); |
1673 | } |
1674 | |
1675 | /* |
1676 | * sysctl_perm does NOT grant the superuser all rights automatically, because |
1677 | * some sysctl variables are readonly even to root. |
1678 | */ |
1679 | |
1680 | static int test_perm(int mode, int op) |
1681 | { |
1682 | if (!current_euid()) |
1683 | mode >>= 6; |
1684 | else if (in_egroup_p(0)) |
1685 | mode >>= 3; |
1686 | if ((op & ~mode & (MAY_READ|MAY_WRITE|MAY_EXEC)) == 0) |
1687 | return 0; |
1688 | return -EACCES; |
1689 | } |
1690 | |
1691 | int sysctl_perm(struct ctl_table_root *root, struct ctl_table *table, int op) |
1692 | { |
1693 | int error; |
1694 | int mode; |
1695 | |
1696 | error = security_sysctl(table, op & (MAY_READ | MAY_WRITE | MAY_EXEC)); |
1697 | if (error) |
1698 | return error; |
1699 | |
1700 | if (root->permissions) |
1701 | mode = root->permissions(root, current->nsproxy, table); |
1702 | else |
1703 | mode = table->mode; |
1704 | |
1705 | return test_perm(mode, op); |
1706 | } |
1707 | |
1708 | static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table) |
1709 | { |
1710 | for (; table->procname; table++) { |
1711 | table->parent = parent; |
1712 | if (table->child) |
1713 | sysctl_set_parent(table, table->child); |
1714 | } |
1715 | } |
1716 | |
1717 | static __init int sysctl_init(void) |
1718 | { |
1719 | sysctl_set_parent(NULL, root_table); |
1720 | #ifdef CONFIG_SYSCTL_SYSCALL_CHECK |
1721 | sysctl_check_table(current->nsproxy, root_table); |
1722 | #endif |
1723 | return 0; |
1724 | } |
1725 | |
1726 | core_initcall(sysctl_init); |
1727 | |
1728 | static struct ctl_table *is_branch_in(struct ctl_table *branch, |
1729 | struct ctl_table *table) |
1730 | { |
1731 | struct ctl_table *p; |
1732 | const char *s = branch->procname; |
1733 | |
1734 | /* branch should have named subdirectory as its first element */ |
1735 | if (!s || !branch->child) |
1736 | return NULL; |
1737 | |
1738 | /* ... and nothing else */ |
1739 | if (branch[1].procname) |
1740 | return NULL; |
1741 | |
1742 | /* table should contain subdirectory with the same name */ |
1743 | for (p = table; p->procname; p++) { |
1744 | if (!p->child) |
1745 | continue; |
1746 | if (p->procname && strcmp(p->procname, s) == 0) |
1747 | return p; |
1748 | } |
1749 | return NULL; |
1750 | } |
1751 | |
1752 | /* see if attaching q to p would be an improvement */ |
1753 | static void try_attach(struct ctl_table_header *p, struct ctl_table_header *q) |
1754 | { |
1755 | struct ctl_table *to = p->ctl_table, *by = q->ctl_table; |
1756 | struct ctl_table *next; |
1757 | int is_better = 0; |
1758 | int not_in_parent = !p->attached_by; |
1759 | |
1760 | while ((next = is_branch_in(by, to)) != NULL) { |
1761 | if (by == q->attached_by) |
1762 | is_better = 1; |
1763 | if (to == p->attached_by) |
1764 | not_in_parent = 1; |
1765 | by = by->child; |
1766 | to = next->child; |
1767 | } |
1768 | |
1769 | if (is_better && not_in_parent) { |
1770 | q->attached_by = by; |
1771 | q->attached_to = to; |
1772 | q->parent = p; |
1773 | } |
1774 | } |
1775 | |
1776 | /** |
1777 | * __register_sysctl_paths - register a sysctl hierarchy |
1778 | * @root: List of sysctl headers to register on |
1779 | * @namespaces: Data to compute which lists of sysctl entries are visible |
1780 | * @path: The path to the directory the sysctl table is in. |
1781 | * @table: the top-level table structure |
1782 | * |
1783 | * Register a sysctl table hierarchy. @table should be a filled in ctl_table |
1784 | * array. A completely 0 filled entry terminates the table. |
1785 | * |
1786 | * The members of the &struct ctl_table structure are used as follows: |
1787 | * |
1788 | * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not |
1789 | * enter a sysctl file |
1790 | * |
1791 | * data - a pointer to data for use by proc_handler |
1792 | * |
1793 | * maxlen - the maximum size in bytes of the data |
1794 | * |
1795 | * mode - the file permissions for the /proc/sys file, and for sysctl(2) |
1796 | * |
1797 | * child - a pointer to the child sysctl table if this entry is a directory, or |
1798 | * %NULL. |
1799 | * |
1800 | * proc_handler - the text handler routine (described below) |
1801 | * |
1802 | * de - for internal use by the sysctl routines |
1803 | * |
1804 | * extra1, extra2 - extra pointers usable by the proc handler routines |
1805 | * |
1806 | * Leaf nodes in the sysctl tree will be represented by a single file |
1807 | * under /proc; non-leaf nodes will be represented by directories. |
1808 | * |
1809 | * sysctl(2) can automatically manage read and write requests through |
1810 | * the sysctl table. The data and maxlen fields of the ctl_table |
1811 | * struct enable minimal validation of the values being written to be |
1812 | * performed, and the mode field allows minimal authentication. |
1813 | * |
1814 | * There must be a proc_handler routine for any terminal nodes |
1815 | * mirrored under /proc/sys (non-terminals are handled by a built-in |
1816 | * directory handler). Several default handlers are available to |
1817 | * cover common cases - |
1818 | * |
1819 | * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(), |
1820 | * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(), |
1821 | * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax() |
1822 | * |
1823 | * It is the handler's job to read the input buffer from user memory |
1824 | * and process it. The handler should return 0 on success. |
1825 | * |
1826 | * This routine returns %NULL on a failure to register, and a pointer |
1827 | * to the table header on success. |
1828 | */ |
1829 | struct ctl_table_header *__register_sysctl_paths( |
1830 | struct ctl_table_root *root, |
1831 | struct nsproxy *namespaces, |
1832 | const struct ctl_path *path, struct ctl_table *table) |
1833 | { |
1834 | struct ctl_table_header *header; |
1835 | struct ctl_table *new, **prevp; |
1836 | unsigned int n, npath; |
1837 | struct ctl_table_set *set; |
1838 | |
1839 | /* Count the path components */ |
1840 | for (npath = 0; path[npath].procname; ++npath) |
1841 | ; |
1842 | |
1843 | /* |
1844 | * For each path component, allocate a 2-element ctl_table array. |
1845 | * The first array element will be filled with the sysctl entry |
1846 | * for this, the second will be the sentinel (procname == 0). |
1847 | * |
1848 | * We allocate everything in one go so that we don't have to |
1849 | * worry about freeing additional memory in unregister_sysctl_table. |
1850 | */ |
1851 | header = kzalloc(sizeof(struct ctl_table_header) + |
1852 | (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL); |
1853 | if (!header) |
1854 | return NULL; |
1855 | |
1856 | new = (struct ctl_table *) (header + 1); |
1857 | |
1858 | /* Now connect the dots */ |
1859 | prevp = &header->ctl_table; |
1860 | for (n = 0; n < npath; ++n, ++path) { |
1861 | /* Copy the procname */ |
1862 | new->procname = path->procname; |
1863 | new->mode = 0555; |
1864 | |
1865 | *prevp = new; |
1866 | prevp = &new->child; |
1867 | |
1868 | new += 2; |
1869 | } |
1870 | *prevp = table; |
1871 | header->ctl_table_arg = table; |
1872 | |
1873 | INIT_LIST_HEAD(&header->ctl_entry); |
1874 | header->used = 0; |
1875 | header->unregistering = NULL; |
1876 | header->root = root; |
1877 | sysctl_set_parent(NULL, header->ctl_table); |
1878 | header->count = 1; |
1879 | #ifdef CONFIG_SYSCTL_SYSCALL_CHECK |
1880 | if (sysctl_check_table(namespaces, header->ctl_table)) { |
1881 | kfree(header); |
1882 | return NULL; |
1883 | } |
1884 | #endif |
1885 | spin_lock(&sysctl_lock); |
1886 | header->set = lookup_header_set(root, namespaces); |
1887 | header->attached_by = header->ctl_table; |
1888 | header->attached_to = root_table; |
1889 | header->parent = &root_table_header; |
1890 | for (set = header->set; set; set = set->parent) { |
1891 | struct ctl_table_header *p; |
1892 | list_for_each_entry(p, &set->list, ctl_entry) { |
1893 | if (p->unregistering) |
1894 | continue; |
1895 | try_attach(p, header); |
1896 | } |
1897 | } |
1898 | header->parent->count++; |
1899 | list_add_tail(&header->ctl_entry, &header->set->list); |
1900 | spin_unlock(&sysctl_lock); |
1901 | |
1902 | return header; |
1903 | } |
1904 | |
1905 | /** |
1906 | * register_sysctl_table_path - register a sysctl table hierarchy |
1907 | * @path: The path to the directory the sysctl table is in. |
1908 | * @table: the top-level table structure |
1909 | * |
1910 | * Register a sysctl table hierarchy. @table should be a filled in ctl_table |
1911 | * array. A completely 0 filled entry terminates the table. |
1912 | * |
1913 | * See __register_sysctl_paths for more details. |
1914 | */ |
1915 | struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path, |
1916 | struct ctl_table *table) |
1917 | { |
1918 | return __register_sysctl_paths(&sysctl_table_root, current->nsproxy, |
1919 | path, table); |
1920 | } |
1921 | |
1922 | /** |
1923 | * register_sysctl_table - register a sysctl table hierarchy |
1924 | * @table: the top-level table structure |
1925 | * |
1926 | * Register a sysctl table hierarchy. @table should be a filled in ctl_table |
1927 | * array. A completely 0 filled entry terminates the table. |
1928 | * |
1929 | * See register_sysctl_paths for more details. |
1930 | */ |
1931 | struct ctl_table_header *register_sysctl_table(struct ctl_table *table) |
1932 | { |
1933 | static const struct ctl_path null_path[] = { {} }; |
1934 | |
1935 | return register_sysctl_paths(null_path, table); |
1936 | } |
1937 | |
1938 | /** |
1939 | * unregister_sysctl_table - unregister a sysctl table hierarchy |
1940 | * @header: the header returned from register_sysctl_table |
1941 | * |
1942 | * Unregisters the sysctl table and all children. proc entries may not |
1943 | * actually be removed until they are no longer used by anyone. |
1944 | */ |
1945 | void unregister_sysctl_table(struct ctl_table_header * header) |
1946 | { |
1947 | might_sleep(); |
1948 | |
1949 | if (header == NULL) |
1950 | return; |
1951 | |
1952 | spin_lock(&sysctl_lock); |
1953 | start_unregistering(header); |
1954 | if (!--header->parent->count) { |
1955 | WARN_ON(1); |
1956 | call_rcu(&header->parent->rcu, free_head); |
1957 | } |
1958 | if (!--header->count) |
1959 | call_rcu(&header->rcu, free_head); |
1960 | spin_unlock(&sysctl_lock); |
1961 | } |
1962 | |
1963 | int sysctl_is_seen(struct ctl_table_header *p) |
1964 | { |
1965 | struct ctl_table_set *set = p->set; |
1966 | int res; |
1967 | spin_lock(&sysctl_lock); |
1968 | if (p->unregistering) |
1969 | res = 0; |
1970 | else if (!set->is_seen) |
1971 | res = 1; |
1972 | else |
1973 | res = set->is_seen(set); |
1974 | spin_unlock(&sysctl_lock); |
1975 | return res; |
1976 | } |
1977 | |
1978 | void setup_sysctl_set(struct ctl_table_set *p, |
1979 | struct ctl_table_set *parent, |
1980 | int (*is_seen)(struct ctl_table_set *)) |
1981 | { |
1982 | INIT_LIST_HEAD(&p->list); |
1983 | p->parent = parent ? parent : &sysctl_table_root.default_set; |
1984 | p->is_seen = is_seen; |
1985 | } |
1986 | |
1987 | #else /* !CONFIG_SYSCTL */ |
1988 | struct ctl_table_header *register_sysctl_table(struct ctl_table * table) |
1989 | { |
1990 | return NULL; |
1991 | } |
1992 | |
1993 | struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path, |
1994 | struct ctl_table *table) |
1995 | { |
1996 | return NULL; |
1997 | } |
1998 | |
1999 | void unregister_sysctl_table(struct ctl_table_header * table) |
2000 | { |
2001 | } |
2002 | |
2003 | void setup_sysctl_set(struct ctl_table_set *p, |
2004 | struct ctl_table_set *parent, |
2005 | int (*is_seen)(struct ctl_table_set *)) |
2006 | { |
2007 | } |
2008 | |
2009 | void sysctl_head_put(struct ctl_table_header *head) |
2010 | { |
2011 | } |
2012 | |
2013 | #endif /* CONFIG_SYSCTL */ |
2014 | |
2015 | /* |
2016 | * /proc/sys support |
2017 | */ |
2018 | |
2019 | #ifdef CONFIG_PROC_SYSCTL |
2020 | |
2021 | static int _proc_do_string(void* data, int maxlen, int write, |
2022 | void __user *buffer, |
2023 | size_t *lenp, loff_t *ppos) |
2024 | { |
2025 | size_t len; |
2026 | char __user *p; |
2027 | char c; |
2028 | |
2029 | if (!data || !maxlen || !*lenp) { |
2030 | *lenp = 0; |
2031 | return 0; |
2032 | } |
2033 | |
2034 | if (write) { |
2035 | len = 0; |
2036 | p = buffer; |
2037 | while (len < *lenp) { |
2038 | if (get_user(c, p++)) |
2039 | return -EFAULT; |
2040 | if (c == 0 || c == '\n') |
2041 | break; |
2042 | len++; |
2043 | } |
2044 | if (len >= maxlen) |
2045 | len = maxlen-1; |
2046 | if(copy_from_user(data, buffer, len)) |
2047 | return -EFAULT; |
2048 | ((char *) data)[len] = 0; |
2049 | *ppos += *lenp; |
2050 | } else { |
2051 | len = strlen(data); |
2052 | if (len > maxlen) |
2053 | len = maxlen; |
2054 | |
2055 | if (*ppos > len) { |
2056 | *lenp = 0; |
2057 | return 0; |
2058 | } |
2059 | |
2060 | data += *ppos; |
2061 | len -= *ppos; |
2062 | |
2063 | if (len > *lenp) |
2064 | len = *lenp; |
2065 | if (len) |
2066 | if(copy_to_user(buffer, data, len)) |
2067 | return -EFAULT; |
2068 | if (len < *lenp) { |
2069 | if(put_user('\n', ((char __user *) buffer) + len)) |
2070 | return -EFAULT; |
2071 | len++; |
2072 | } |
2073 | *lenp = len; |
2074 | *ppos += len; |
2075 | } |
2076 | return 0; |
2077 | } |
2078 | |
2079 | /** |
2080 | * proc_dostring - read a string sysctl |
2081 | * @table: the sysctl table |
2082 | * @write: %TRUE if this is a write to the sysctl file |
2083 | * @buffer: the user buffer |
2084 | * @lenp: the size of the user buffer |
2085 | * @ppos: file position |
2086 | * |
2087 | * Reads/writes a string from/to the user buffer. If the kernel |
2088 | * buffer provided is not large enough to hold the string, the |
2089 | * string is truncated. The copied string is %NULL-terminated. |
2090 | * If the string is being read by the user process, it is copied |
2091 | * and a newline '\n' is added. It is truncated if the buffer is |
2092 | * not large enough. |
2093 | * |
2094 | * Returns 0 on success. |
2095 | */ |
2096 | int proc_dostring(struct ctl_table *table, int write, |
2097 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2098 | { |
2099 | return _proc_do_string(table->data, table->maxlen, write, |
2100 | buffer, lenp, ppos); |
2101 | } |
2102 | |
2103 | static size_t proc_skip_spaces(char **buf) |
2104 | { |
2105 | size_t ret; |
2106 | char *tmp = skip_spaces(*buf); |
2107 | ret = tmp - *buf; |
2108 | *buf = tmp; |
2109 | return ret; |
2110 | } |
2111 | |
2112 | static void proc_skip_char(char **buf, size_t *size, const char v) |
2113 | { |
2114 | while (*size) { |
2115 | if (**buf != v) |
2116 | break; |
2117 | (*size)--; |
2118 | (*buf)++; |
2119 | } |
2120 | } |
2121 | |
2122 | #define TMPBUFLEN 22 |
2123 | /** |
2124 | * proc_get_long - reads an ASCII formatted integer from a user buffer |
2125 | * |
2126 | * @buf: a kernel buffer |
2127 | * @size: size of the kernel buffer |
2128 | * @val: this is where the number will be stored |
2129 | * @neg: set to %TRUE if number is negative |
2130 | * @perm_tr: a vector which contains the allowed trailers |
2131 | * @perm_tr_len: size of the perm_tr vector |
2132 | * @tr: pointer to store the trailer character |
2133 | * |
2134 | * In case of success %0 is returned and @buf and @size are updated with |
2135 | * the amount of bytes read. If @tr is non-NULL and a trailing |
2136 | * character exists (size is non-zero after returning from this |
2137 | * function), @tr is updated with the trailing character. |
2138 | */ |
2139 | static int proc_get_long(char **buf, size_t *size, |
2140 | unsigned long *val, bool *neg, |
2141 | const char *perm_tr, unsigned perm_tr_len, char *tr) |
2142 | { |
2143 | int len; |
2144 | char *p, tmp[TMPBUFLEN]; |
2145 | |
2146 | if (!*size) |
2147 | return -EINVAL; |
2148 | |
2149 | len = *size; |
2150 | if (len > TMPBUFLEN - 1) |
2151 | len = TMPBUFLEN - 1; |
2152 | |
2153 | memcpy(tmp, *buf, len); |
2154 | |
2155 | tmp[len] = 0; |
2156 | p = tmp; |
2157 | if (*p == '-' && *size > 1) { |
2158 | *neg = true; |
2159 | p++; |
2160 | } else |
2161 | *neg = false; |
2162 | if (!isdigit(*p)) |
2163 | return -EINVAL; |
2164 | |
2165 | *val = simple_strtoul(p, &p, 0); |
2166 | |
2167 | len = p - tmp; |
2168 | |
2169 | /* We don't know if the next char is whitespace thus we may accept |
2170 | * invalid integers (e.g. 1234...a) or two integers instead of one |
2171 | * (e.g. 123...1). So lets not allow such large numbers. */ |
2172 | if (len == TMPBUFLEN - 1) |
2173 | return -EINVAL; |
2174 | |
2175 | if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len)) |
2176 | return -EINVAL; |
2177 | |
2178 | if (tr && (len < *size)) |
2179 | *tr = *p; |
2180 | |
2181 | *buf += len; |
2182 | *size -= len; |
2183 | |
2184 | return 0; |
2185 | } |
2186 | |
2187 | /** |
2188 | * proc_put_long - converts an integer to a decimal ASCII formatted string |
2189 | * |
2190 | * @buf: the user buffer |
2191 | * @size: the size of the user buffer |
2192 | * @val: the integer to be converted |
2193 | * @neg: sign of the number, %TRUE for negative |
2194 | * |
2195 | * In case of success %0 is returned and @buf and @size are updated with |
2196 | * the amount of bytes written. |
2197 | */ |
2198 | static int proc_put_long(void __user **buf, size_t *size, unsigned long val, |
2199 | bool neg) |
2200 | { |
2201 | int len; |
2202 | char tmp[TMPBUFLEN], *p = tmp; |
2203 | |
2204 | sprintf(p, "%s%lu", neg ? "-" : "", val); |
2205 | len = strlen(tmp); |
2206 | if (len > *size) |
2207 | len = *size; |
2208 | if (copy_to_user(*buf, tmp, len)) |
2209 | return -EFAULT; |
2210 | *size -= len; |
2211 | *buf += len; |
2212 | return 0; |
2213 | } |
2214 | #undef TMPBUFLEN |
2215 | |
2216 | static int proc_put_char(void __user **buf, size_t *size, char c) |
2217 | { |
2218 | if (*size) { |
2219 | char __user **buffer = (char __user **)buf; |
2220 | if (put_user(c, *buffer)) |
2221 | return -EFAULT; |
2222 | (*size)--, (*buffer)++; |
2223 | *buf = *buffer; |
2224 | } |
2225 | return 0; |
2226 | } |
2227 | |
2228 | static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp, |
2229 | int *valp, |
2230 | int write, void *data) |
2231 | { |
2232 | if (write) { |
2233 | *valp = *negp ? -*lvalp : *lvalp; |
2234 | } else { |
2235 | int val = *valp; |
2236 | if (val < 0) { |
2237 | *negp = true; |
2238 | *lvalp = (unsigned long)-val; |
2239 | } else { |
2240 | *negp = false; |
2241 | *lvalp = (unsigned long)val; |
2242 | } |
2243 | } |
2244 | return 0; |
2245 | } |
2246 | |
2247 | static const char proc_wspace_sep[] = { ' ', '\t', '\n' }; |
2248 | |
2249 | static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table, |
2250 | int write, void __user *buffer, |
2251 | size_t *lenp, loff_t *ppos, |
2252 | int (*conv)(bool *negp, unsigned long *lvalp, int *valp, |
2253 | int write, void *data), |
2254 | void *data) |
2255 | { |
2256 | int *i, vleft, first = 1, err = 0; |
2257 | unsigned long page = 0; |
2258 | size_t left; |
2259 | char *kbuf; |
2260 | |
2261 | if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) { |
2262 | *lenp = 0; |
2263 | return 0; |
2264 | } |
2265 | |
2266 | i = (int *) tbl_data; |
2267 | vleft = table->maxlen / sizeof(*i); |
2268 | left = *lenp; |
2269 | |
2270 | if (!conv) |
2271 | conv = do_proc_dointvec_conv; |
2272 | |
2273 | if (write) { |
2274 | if (left > PAGE_SIZE - 1) |
2275 | left = PAGE_SIZE - 1; |
2276 | page = __get_free_page(GFP_TEMPORARY); |
2277 | kbuf = (char *) page; |
2278 | if (!kbuf) |
2279 | return -ENOMEM; |
2280 | if (copy_from_user(kbuf, buffer, left)) { |
2281 | err = -EFAULT; |
2282 | goto free; |
2283 | } |
2284 | kbuf[left] = 0; |
2285 | } |
2286 | |
2287 | for (; left && vleft--; i++, first=0) { |
2288 | unsigned long lval; |
2289 | bool neg; |
2290 | |
2291 | if (write) { |
2292 | left -= proc_skip_spaces(&kbuf); |
2293 | |
2294 | if (!left) |
2295 | break; |
2296 | err = proc_get_long(&kbuf, &left, &lval, &neg, |
2297 | proc_wspace_sep, |
2298 | sizeof(proc_wspace_sep), NULL); |
2299 | if (err) |
2300 | break; |
2301 | if (conv(&neg, &lval, i, 1, data)) { |
2302 | err = -EINVAL; |
2303 | break; |
2304 | } |
2305 | } else { |
2306 | if (conv(&neg, &lval, i, 0, data)) { |
2307 | err = -EINVAL; |
2308 | break; |
2309 | } |
2310 | if (!first) |
2311 | err = proc_put_char(&buffer, &left, '\t'); |
2312 | if (err) |
2313 | break; |
2314 | err = proc_put_long(&buffer, &left, lval, neg); |
2315 | if (err) |
2316 | break; |
2317 | } |
2318 | } |
2319 | |
2320 | if (!write && !first && left && !err) |
2321 | err = proc_put_char(&buffer, &left, '\n'); |
2322 | if (write && !err && left) |
2323 | left -= proc_skip_spaces(&kbuf); |
2324 | free: |
2325 | if (write) { |
2326 | free_page(page); |
2327 | if (first) |
2328 | return err ? : -EINVAL; |
2329 | } |
2330 | *lenp -= left; |
2331 | *ppos += *lenp; |
2332 | return err; |
2333 | } |
2334 | |
2335 | static int do_proc_dointvec(struct ctl_table *table, int write, |
2336 | void __user *buffer, size_t *lenp, loff_t *ppos, |
2337 | int (*conv)(bool *negp, unsigned long *lvalp, int *valp, |
2338 | int write, void *data), |
2339 | void *data) |
2340 | { |
2341 | return __do_proc_dointvec(table->data, table, write, |
2342 | buffer, lenp, ppos, conv, data); |
2343 | } |
2344 | |
2345 | /** |
2346 | * proc_dointvec - read a vector of integers |
2347 | * @table: the sysctl table |
2348 | * @write: %TRUE if this is a write to the sysctl file |
2349 | * @buffer: the user buffer |
2350 | * @lenp: the size of the user buffer |
2351 | * @ppos: file position |
2352 | * |
2353 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer |
2354 | * values from/to the user buffer, treated as an ASCII string. |
2355 | * |
2356 | * Returns 0 on success. |
2357 | */ |
2358 | int proc_dointvec(struct ctl_table *table, int write, |
2359 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2360 | { |
2361 | return do_proc_dointvec(table,write,buffer,lenp,ppos, |
2362 | NULL,NULL); |
2363 | } |
2364 | |
2365 | /* |
2366 | * Taint values can only be increased |
2367 | * This means we can safely use a temporary. |
2368 | */ |
2369 | static int proc_taint(struct ctl_table *table, int write, |
2370 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2371 | { |
2372 | struct ctl_table t; |
2373 | unsigned long tmptaint = get_taint(); |
2374 | int err; |
2375 | |
2376 | if (write && !capable(CAP_SYS_ADMIN)) |
2377 | return -EPERM; |
2378 | |
2379 | t = *table; |
2380 | t.data = &tmptaint; |
2381 | err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos); |
2382 | if (err < 0) |
2383 | return err; |
2384 | |
2385 | if (write) { |
2386 | /* |
2387 | * Poor man's atomic or. Not worth adding a primitive |
2388 | * to everyone's atomic.h for this |
2389 | */ |
2390 | int i; |
2391 | for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) { |
2392 | if ((tmptaint >> i) & 1) |
2393 | add_taint(i); |
2394 | } |
2395 | } |
2396 | |
2397 | return err; |
2398 | } |
2399 | |
2400 | struct do_proc_dointvec_minmax_conv_param { |
2401 | int *min; |
2402 | int *max; |
2403 | }; |
2404 | |
2405 | static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp, |
2406 | int *valp, |
2407 | int write, void *data) |
2408 | { |
2409 | struct do_proc_dointvec_minmax_conv_param *param = data; |
2410 | if (write) { |
2411 | int val = *negp ? -*lvalp : *lvalp; |
2412 | if ((param->min && *param->min > val) || |
2413 | (param->max && *param->max < val)) |
2414 | return -EINVAL; |
2415 | *valp = val; |
2416 | } else { |
2417 | int val = *valp; |
2418 | if (val < 0) { |
2419 | *negp = true; |
2420 | *lvalp = (unsigned long)-val; |
2421 | } else { |
2422 | *negp = false; |
2423 | *lvalp = (unsigned long)val; |
2424 | } |
2425 | } |
2426 | return 0; |
2427 | } |
2428 | |
2429 | /** |
2430 | * proc_dointvec_minmax - read a vector of integers with min/max values |
2431 | * @table: the sysctl table |
2432 | * @write: %TRUE if this is a write to the sysctl file |
2433 | * @buffer: the user buffer |
2434 | * @lenp: the size of the user buffer |
2435 | * @ppos: file position |
2436 | * |
2437 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer |
2438 | * values from/to the user buffer, treated as an ASCII string. |
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_dointvec_minmax(struct ctl_table *table, int write, |
2446 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2447 | { |
2448 | struct do_proc_dointvec_minmax_conv_param param = { |
2449 | .min = (int *) table->extra1, |
2450 | .max = (int *) table->extra2, |
2451 | }; |
2452 | return do_proc_dointvec(table, write, buffer, lenp, ppos, |
2453 | do_proc_dointvec_minmax_conv, ¶m); |
2454 | } |
2455 | |
2456 | static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write, |
2457 | void __user *buffer, |
2458 | size_t *lenp, loff_t *ppos, |
2459 | unsigned long convmul, |
2460 | unsigned long convdiv) |
2461 | { |
2462 | unsigned long *i, *min, *max; |
2463 | int vleft, first = 1, err = 0; |
2464 | unsigned long page = 0; |
2465 | size_t left; |
2466 | char *kbuf; |
2467 | |
2468 | if (!data || !table->maxlen || !*lenp || (*ppos && !write)) { |
2469 | *lenp = 0; |
2470 | return 0; |
2471 | } |
2472 | |
2473 | i = (unsigned long *) data; |
2474 | min = (unsigned long *) table->extra1; |
2475 | max = (unsigned long *) table->extra2; |
2476 | vleft = table->maxlen / sizeof(unsigned long); |
2477 | left = *lenp; |
2478 | |
2479 | if (write) { |
2480 | if (left > PAGE_SIZE - 1) |
2481 | left = PAGE_SIZE - 1; |
2482 | page = __get_free_page(GFP_TEMPORARY); |
2483 | kbuf = (char *) page; |
2484 | if (!kbuf) |
2485 | return -ENOMEM; |
2486 | if (copy_from_user(kbuf, buffer, left)) { |
2487 | err = -EFAULT; |
2488 | goto free; |
2489 | } |
2490 | kbuf[left] = 0; |
2491 | } |
2492 | |
2493 | for (; left && vleft--; i++, first = 0) { |
2494 | unsigned long val; |
2495 | |
2496 | if (write) { |
2497 | bool neg; |
2498 | |
2499 | left -= proc_skip_spaces(&kbuf); |
2500 | |
2501 | err = proc_get_long(&kbuf, &left, &val, &neg, |
2502 | proc_wspace_sep, |
2503 | sizeof(proc_wspace_sep), NULL); |
2504 | if (err) |
2505 | break; |
2506 | if (neg) |
2507 | continue; |
2508 | if ((min && val < *min) || (max && val > *max)) |
2509 | continue; |
2510 | *i = val; |
2511 | } else { |
2512 | val = convdiv * (*i) / convmul; |
2513 | if (!first) |
2514 | err = proc_put_char(&buffer, &left, '\t'); |
2515 | err = proc_put_long(&buffer, &left, val, false); |
2516 | if (err) |
2517 | break; |
2518 | } |
2519 | } |
2520 | |
2521 | if (!write && !first && left && !err) |
2522 | err = proc_put_char(&buffer, &left, '\n'); |
2523 | if (write && !err) |
2524 | left -= proc_skip_spaces(&kbuf); |
2525 | free: |
2526 | if (write) { |
2527 | free_page(page); |
2528 | if (first) |
2529 | return err ? : -EINVAL; |
2530 | } |
2531 | *lenp -= left; |
2532 | *ppos += *lenp; |
2533 | return err; |
2534 | } |
2535 | |
2536 | static int do_proc_doulongvec_minmax(struct ctl_table *table, int write, |
2537 | void __user *buffer, |
2538 | size_t *lenp, loff_t *ppos, |
2539 | unsigned long convmul, |
2540 | unsigned long convdiv) |
2541 | { |
2542 | return __do_proc_doulongvec_minmax(table->data, table, write, |
2543 | buffer, lenp, ppos, convmul, convdiv); |
2544 | } |
2545 | |
2546 | /** |
2547 | * proc_doulongvec_minmax - read a vector of long integers with min/max values |
2548 | * @table: the sysctl table |
2549 | * @write: %TRUE if this is a write to the sysctl file |
2550 | * @buffer: the user buffer |
2551 | * @lenp: the size of the user buffer |
2552 | * @ppos: file position |
2553 | * |
2554 | * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long |
2555 | * values from/to the user buffer, treated as an ASCII string. |
2556 | * |
2557 | * This routine will ensure the values are within the range specified by |
2558 | * table->extra1 (min) and table->extra2 (max). |
2559 | * |
2560 | * Returns 0 on success. |
2561 | */ |
2562 | int proc_doulongvec_minmax(struct ctl_table *table, int write, |
2563 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2564 | { |
2565 | return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l); |
2566 | } |
2567 | |
2568 | /** |
2569 | * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values |
2570 | * @table: the sysctl table |
2571 | * @write: %TRUE if this is a write to the sysctl file |
2572 | * @buffer: the user buffer |
2573 | * @lenp: the size of the user buffer |
2574 | * @ppos: file position |
2575 | * |
2576 | * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long |
2577 | * values from/to the user buffer, treated as an ASCII string. The values |
2578 | * are treated as milliseconds, and converted to jiffies when they are stored. |
2579 | * |
2580 | * This routine will ensure the values are within the range specified by |
2581 | * table->extra1 (min) and table->extra2 (max). |
2582 | * |
2583 | * Returns 0 on success. |
2584 | */ |
2585 | int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, |
2586 | void __user *buffer, |
2587 | size_t *lenp, loff_t *ppos) |
2588 | { |
2589 | return do_proc_doulongvec_minmax(table, write, buffer, |
2590 | lenp, ppos, HZ, 1000l); |
2591 | } |
2592 | |
2593 | |
2594 | static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp, |
2595 | int *valp, |
2596 | int write, void *data) |
2597 | { |
2598 | if (write) { |
2599 | if (*lvalp > LONG_MAX / HZ) |
2600 | return 1; |
2601 | *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ); |
2602 | } else { |
2603 | int val = *valp; |
2604 | unsigned long lval; |
2605 | if (val < 0) { |
2606 | *negp = true; |
2607 | lval = (unsigned long)-val; |
2608 | } else { |
2609 | *negp = false; |
2610 | lval = (unsigned long)val; |
2611 | } |
2612 | *lvalp = lval / HZ; |
2613 | } |
2614 | return 0; |
2615 | } |
2616 | |
2617 | static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp, |
2618 | int *valp, |
2619 | int write, void *data) |
2620 | { |
2621 | if (write) { |
2622 | if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ) |
2623 | return 1; |
2624 | *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp); |
2625 | } else { |
2626 | int val = *valp; |
2627 | unsigned long lval; |
2628 | if (val < 0) { |
2629 | *negp = true; |
2630 | lval = (unsigned long)-val; |
2631 | } else { |
2632 | *negp = false; |
2633 | lval = (unsigned long)val; |
2634 | } |
2635 | *lvalp = jiffies_to_clock_t(lval); |
2636 | } |
2637 | return 0; |
2638 | } |
2639 | |
2640 | static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp, |
2641 | int *valp, |
2642 | int write, void *data) |
2643 | { |
2644 | if (write) { |
2645 | *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp); |
2646 | } else { |
2647 | int val = *valp; |
2648 | unsigned long lval; |
2649 | if (val < 0) { |
2650 | *negp = true; |
2651 | lval = (unsigned long)-val; |
2652 | } else { |
2653 | *negp = false; |
2654 | lval = (unsigned long)val; |
2655 | } |
2656 | *lvalp = jiffies_to_msecs(lval); |
2657 | } |
2658 | return 0; |
2659 | } |
2660 | |
2661 | /** |
2662 | * proc_dointvec_jiffies - read a vector of integers as seconds |
2663 | * @table: the sysctl table |
2664 | * @write: %TRUE if this is a write to the sysctl file |
2665 | * @buffer: the user buffer |
2666 | * @lenp: the size of the user buffer |
2667 | * @ppos: file position |
2668 | * |
2669 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer |
2670 | * values from/to the user buffer, treated as an ASCII string. |
2671 | * The values read are assumed to be in seconds, and are converted into |
2672 | * jiffies. |
2673 | * |
2674 | * Returns 0 on success. |
2675 | */ |
2676 | int proc_dointvec_jiffies(struct ctl_table *table, int write, |
2677 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2678 | { |
2679 | return do_proc_dointvec(table,write,buffer,lenp,ppos, |
2680 | do_proc_dointvec_jiffies_conv,NULL); |
2681 | } |
2682 | |
2683 | /** |
2684 | * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds |
2685 | * @table: the sysctl table |
2686 | * @write: %TRUE if this is a write to the sysctl file |
2687 | * @buffer: the user buffer |
2688 | * @lenp: the size of the user buffer |
2689 | * @ppos: pointer to the file position |
2690 | * |
2691 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer |
2692 | * values from/to the user buffer, treated as an ASCII string. |
2693 | * The values read are assumed to be in 1/USER_HZ seconds, and |
2694 | * are converted into jiffies. |
2695 | * |
2696 | * Returns 0 on success. |
2697 | */ |
2698 | int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, |
2699 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2700 | { |
2701 | return do_proc_dointvec(table,write,buffer,lenp,ppos, |
2702 | do_proc_dointvec_userhz_jiffies_conv,NULL); |
2703 | } |
2704 | |
2705 | /** |
2706 | * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds |
2707 | * @table: the sysctl table |
2708 | * @write: %TRUE if this is a write to the sysctl file |
2709 | * @buffer: the user buffer |
2710 | * @lenp: the size of the user buffer |
2711 | * @ppos: file position |
2712 | * @ppos: the current position in the file |
2713 | * |
2714 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer |
2715 | * values from/to the user buffer, treated as an ASCII string. |
2716 | * The values read are assumed to be in 1/1000 seconds, and |
2717 | * are converted into jiffies. |
2718 | * |
2719 | * Returns 0 on success. |
2720 | */ |
2721 | int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, |
2722 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2723 | { |
2724 | return do_proc_dointvec(table, write, buffer, lenp, ppos, |
2725 | do_proc_dointvec_ms_jiffies_conv, NULL); |
2726 | } |
2727 | |
2728 | static int proc_do_cad_pid(struct ctl_table *table, int write, |
2729 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2730 | { |
2731 | struct pid *new_pid; |
2732 | pid_t tmp; |
2733 | int r; |
2734 | |
2735 | tmp = pid_vnr(cad_pid); |
2736 | |
2737 | r = __do_proc_dointvec(&tmp, table, write, buffer, |
2738 | lenp, ppos, NULL, NULL); |
2739 | if (r || !write) |
2740 | return r; |
2741 | |
2742 | new_pid = find_get_pid(tmp); |
2743 | if (!new_pid) |
2744 | return -ESRCH; |
2745 | |
2746 | put_pid(xchg(&cad_pid, new_pid)); |
2747 | return 0; |
2748 | } |
2749 | |
2750 | /** |
2751 | * proc_do_large_bitmap - read/write from/to a large bitmap |
2752 | * @table: the sysctl table |
2753 | * @write: %TRUE if this is a write to the sysctl file |
2754 | * @buffer: the user buffer |
2755 | * @lenp: the size of the user buffer |
2756 | * @ppos: file position |
2757 | * |
2758 | * The bitmap is stored at table->data and the bitmap length (in bits) |
2759 | * in table->maxlen. |
2760 | * |
2761 | * We use a range comma separated format (e.g. 1,3-4,10-10) so that |
2762 | * large bitmaps may be represented in a compact manner. Writing into |
2763 | * the file will clear the bitmap then update it with the given input. |
2764 | * |
2765 | * Returns 0 on success. |
2766 | */ |
2767 | int proc_do_large_bitmap(struct ctl_table *table, int write, |
2768 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2769 | { |
2770 | int err = 0; |
2771 | bool first = 1; |
2772 | size_t left = *lenp; |
2773 | unsigned long bitmap_len = table->maxlen; |
2774 | unsigned long *bitmap = (unsigned long *) table->data; |
2775 | unsigned long *tmp_bitmap = NULL; |
2776 | char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c; |
2777 | |
2778 | if (!bitmap_len || !left || (*ppos && !write)) { |
2779 | *lenp = 0; |
2780 | return 0; |
2781 | } |
2782 | |
2783 | if (write) { |
2784 | unsigned long page = 0; |
2785 | char *kbuf; |
2786 | |
2787 | if (left > PAGE_SIZE - 1) |
2788 | left = PAGE_SIZE - 1; |
2789 | |
2790 | page = __get_free_page(GFP_TEMPORARY); |
2791 | kbuf = (char *) page; |
2792 | if (!kbuf) |
2793 | return -ENOMEM; |
2794 | if (copy_from_user(kbuf, buffer, left)) { |
2795 | free_page(page); |
2796 | return -EFAULT; |
2797 | } |
2798 | kbuf[left] = 0; |
2799 | |
2800 | tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long), |
2801 | GFP_KERNEL); |
2802 | if (!tmp_bitmap) { |
2803 | free_page(page); |
2804 | return -ENOMEM; |
2805 | } |
2806 | proc_skip_char(&kbuf, &left, '\n'); |
2807 | while (!err && left) { |
2808 | unsigned long val_a, val_b; |
2809 | bool neg; |
2810 | |
2811 | err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a, |
2812 | sizeof(tr_a), &c); |
2813 | if (err) |
2814 | break; |
2815 | if (val_a >= bitmap_len || neg) { |
2816 | err = -EINVAL; |
2817 | break; |
2818 | } |
2819 | |
2820 | val_b = val_a; |
2821 | if (left) { |
2822 | kbuf++; |
2823 | left--; |
2824 | } |
2825 | |
2826 | if (c == '-') { |
2827 | err = proc_get_long(&kbuf, &left, &val_b, |
2828 | &neg, tr_b, sizeof(tr_b), |
2829 | &c); |
2830 | if (err) |
2831 | break; |
2832 | if (val_b >= bitmap_len || neg || |
2833 | val_a > val_b) { |
2834 | err = -EINVAL; |
2835 | break; |
2836 | } |
2837 | if (left) { |
2838 | kbuf++; |
2839 | left--; |
2840 | } |
2841 | } |
2842 | |
2843 | while (val_a <= val_b) |
2844 | set_bit(val_a++, tmp_bitmap); |
2845 | |
2846 | first = 0; |
2847 | proc_skip_char(&kbuf, &left, '\n'); |
2848 | } |
2849 | free_page(page); |
2850 | } else { |
2851 | unsigned long bit_a, bit_b = 0; |
2852 | |
2853 | while (left) { |
2854 | bit_a = find_next_bit(bitmap, bitmap_len, bit_b); |
2855 | if (bit_a >= bitmap_len) |
2856 | break; |
2857 | bit_b = find_next_zero_bit(bitmap, bitmap_len, |
2858 | bit_a + 1) - 1; |
2859 | |
2860 | if (!first) { |
2861 | err = proc_put_char(&buffer, &left, ','); |
2862 | if (err) |
2863 | break; |
2864 | } |
2865 | err = proc_put_long(&buffer, &left, bit_a, false); |
2866 | if (err) |
2867 | break; |
2868 | if (bit_a != bit_b) { |
2869 | err = proc_put_char(&buffer, &left, '-'); |
2870 | if (err) |
2871 | break; |
2872 | err = proc_put_long(&buffer, &left, bit_b, false); |
2873 | if (err) |
2874 | break; |
2875 | } |
2876 | |
2877 | first = 0; bit_b++; |
2878 | } |
2879 | if (!err) |
2880 | err = proc_put_char(&buffer, &left, '\n'); |
2881 | } |
2882 | |
2883 | if (!err) { |
2884 | if (write) { |
2885 | if (*ppos) |
2886 | bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len); |
2887 | else |
2888 | memcpy(bitmap, tmp_bitmap, |
2889 | BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long)); |
2890 | } |
2891 | kfree(tmp_bitmap); |
2892 | *lenp -= left; |
2893 | *ppos += *lenp; |
2894 | return 0; |
2895 | } else { |
2896 | kfree(tmp_bitmap); |
2897 | return err; |
2898 | } |
2899 | } |
2900 | |
2901 | #else /* CONFIG_PROC_SYSCTL */ |
2902 | |
2903 | int proc_dostring(struct ctl_table *table, int write, |
2904 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2905 | { |
2906 | return -ENOSYS; |
2907 | } |
2908 | |
2909 | int proc_dointvec(struct ctl_table *table, int write, |
2910 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2911 | { |
2912 | return -ENOSYS; |
2913 | } |
2914 | |
2915 | int proc_dointvec_minmax(struct ctl_table *table, int write, |
2916 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2917 | { |
2918 | return -ENOSYS; |
2919 | } |
2920 | |
2921 | int proc_dointvec_jiffies(struct ctl_table *table, int write, |
2922 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2923 | { |
2924 | return -ENOSYS; |
2925 | } |
2926 | |
2927 | int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, |
2928 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2929 | { |
2930 | return -ENOSYS; |
2931 | } |
2932 | |
2933 | int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, |
2934 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2935 | { |
2936 | return -ENOSYS; |
2937 | } |
2938 | |
2939 | int proc_doulongvec_minmax(struct ctl_table *table, int write, |
2940 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2941 | { |
2942 | return -ENOSYS; |
2943 | } |
2944 | |
2945 | int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, |
2946 | void __user *buffer, |
2947 | size_t *lenp, loff_t *ppos) |
2948 | { |
2949 | return -ENOSYS; |
2950 | } |
2951 | |
2952 | |
2953 | #endif /* CONFIG_PROC_SYSCTL */ |
2954 | |
2955 | /* |
2956 | * No sense putting this after each symbol definition, twice, |
2957 | * exception granted :-) |
2958 | */ |
2959 | EXPORT_SYMBOL(proc_dointvec); |
2960 | EXPORT_SYMBOL(proc_dointvec_jiffies); |
2961 | EXPORT_SYMBOL(proc_dointvec_minmax); |
2962 | EXPORT_SYMBOL(proc_dointvec_userhz_jiffies); |
2963 | EXPORT_SYMBOL(proc_dointvec_ms_jiffies); |
2964 | EXPORT_SYMBOL(proc_dostring); |
2965 | EXPORT_SYMBOL(proc_doulongvec_minmax); |
2966 | EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax); |
2967 | EXPORT_SYMBOL(register_sysctl_table); |
2968 | EXPORT_SYMBOL(register_sysctl_paths); |
2969 | EXPORT_SYMBOL(unregister_sysctl_table); |
2970 |
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