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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/bitmap.h> | |
27 | #include <linux/signal.h> | |
28 | #include <linux/printk.h> | |
29 | #include <linux/proc_fs.h> | |
30 | #include <linux/security.h> | |
31 | #include <linux/ctype.h> | |
32 | #include <linux/kmemcheck.h> | |
33 | #include <linux/kmemleak.h> | |
34 | #include <linux/fs.h> | |
35 | #include <linux/init.h> | |
36 | #include <linux/kernel.h> | |
37 | #include <linux/kobject.h> | |
38 | #include <linux/net.h> | |
39 | #include <linux/sysrq.h> | |
40 | #include <linux/highuid.h> | |
41 | #include <linux/writeback.h> | |
42 | #include <linux/ratelimit.h> | |
43 | #include <linux/compaction.h> | |
44 | #include <linux/hugetlb.h> | |
45 | #include <linux/initrd.h> | |
46 | #include <linux/key.h> | |
47 | #include <linux/times.h> | |
48 | #include <linux/limits.h> | |
49 | #include <linux/dcache.h> | |
50 | #include <linux/dnotify.h> | |
51 | #include <linux/syscalls.h> | |
52 | #include <linux/vmstat.h> | |
53 | #include <linux/nfs_fs.h> | |
54 | #include <linux/acpi.h> | |
55 | #include <linux/reboot.h> | |
56 | #include <linux/ftrace.h> | |
57 | #include <linux/perf_event.h> | |
58 | #include <linux/kprobes.h> | |
59 | #include <linux/pipe_fs_i.h> | |
60 | #include <linux/oom.h> | |
61 | #include <linux/kmod.h> | |
62 | #include <linux/capability.h> | |
63 | #include <linux/binfmts.h> | |
64 | #include <linux/sched/sysctl.h> | |
65 | ||
66 | #include <asm/uaccess.h> | |
67 | #include <asm/processor.h> | |
68 | ||
69 | #ifdef CONFIG_X86 | |
70 | #include <asm/nmi.h> | |
71 | #include <asm/stacktrace.h> | |
72 | #include <asm/io.h> | |
73 | #endif | |
74 | #ifdef CONFIG_SPARC | |
75 | #include <asm/setup.h> | |
76 | #endif | |
77 | #ifdef CONFIG_BSD_PROCESS_ACCT | |
78 | #include <linux/acct.h> | |
79 | #endif | |
80 | #ifdef CONFIG_RT_MUTEXES | |
81 | #include <linux/rtmutex.h> | |
82 | #endif | |
83 | #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT) | |
84 | #include <linux/lockdep.h> | |
85 | #endif | |
86 | #ifdef CONFIG_CHR_DEV_SG | |
87 | #include <scsi/sg.h> | |
88 | #endif | |
89 | ||
90 | #ifdef CONFIG_LOCKUP_DETECTOR | |
91 | #include <linux/nmi.h> | |
92 | #endif | |
93 | ||
94 | ||
95 | #if defined(CONFIG_SYSCTL) | |
96 | ||
97 | /* External variables not in a header file. */ | |
98 | extern int sysctl_overcommit_memory; | |
99 | extern int sysctl_overcommit_ratio; | |
100 | extern int max_threads; | |
101 | extern int suid_dumpable; | |
102 | #ifdef CONFIG_COREDUMP | |
103 | extern int core_uses_pid; | |
104 | extern char core_pattern[]; | |
105 | extern unsigned int core_pipe_limit; | |
106 | #endif | |
107 | extern int pid_max; | |
108 | extern int pid_max_min, pid_max_max; | |
109 | extern int percpu_pagelist_fraction; | |
110 | extern int compat_log; | |
111 | extern int latencytop_enabled; | |
112 | extern int sysctl_nr_open_min, sysctl_nr_open_max; | |
113 | #ifndef CONFIG_MMU | |
114 | extern int sysctl_nr_trim_pages; | |
115 | #endif | |
116 | #ifdef CONFIG_BLOCK | |
117 | extern int blk_iopoll_enabled; | |
118 | #endif | |
119 | ||
120 | /* Constants used for minimum and maximum */ | |
121 | #ifdef CONFIG_LOCKUP_DETECTOR | |
122 | static int sixty = 60; | |
123 | #endif | |
124 | ||
125 | static int zero; | |
126 | static int __maybe_unused one = 1; | |
127 | static int __maybe_unused two = 2; | |
128 | static int __maybe_unused three = 3; | |
129 | static unsigned long one_ul = 1; | |
130 | static int one_hundred = 100; | |
131 | #ifdef CONFIG_PRINTK | |
132 | static int ten_thousand = 10000; | |
133 | #endif | |
134 | ||
135 | /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */ | |
136 | static unsigned long dirty_bytes_min = 2 * PAGE_SIZE; | |
137 | ||
138 | /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */ | |
139 | static int maxolduid = 65535; | |
140 | static int minolduid; | |
141 | static int min_percpu_pagelist_fract = 8; | |
142 | ||
143 | static int ngroups_max = NGROUPS_MAX; | |
144 | static const int cap_last_cap = CAP_LAST_CAP; | |
145 | ||
146 | #ifdef CONFIG_INOTIFY_USER | |
147 | #include <linux/inotify.h> | |
148 | #endif | |
149 | #ifdef CONFIG_SPARC | |
150 | #endif | |
151 | ||
152 | #ifdef CONFIG_SPARC64 | |
153 | extern int sysctl_tsb_ratio; | |
154 | #endif | |
155 | ||
156 | #ifdef __hppa__ | |
157 | extern int pwrsw_enabled; | |
158 | #endif | |
159 | ||
160 | #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW | |
161 | extern int unaligned_enabled; | |
162 | #endif | |
163 | ||
164 | #ifdef CONFIG_IA64 | |
165 | extern int unaligned_dump_stack; | |
166 | #endif | |
167 | ||
168 | #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN | |
169 | extern int no_unaligned_warning; | |
170 | #endif | |
171 | ||
172 | #ifdef CONFIG_PROC_SYSCTL | |
173 | static int proc_do_cad_pid(struct ctl_table *table, int write, | |
174 | void __user *buffer, size_t *lenp, loff_t *ppos); | |
175 | static int proc_taint(struct ctl_table *table, int write, | |
176 | void __user *buffer, size_t *lenp, loff_t *ppos); | |
177 | #endif | |
178 | ||
179 | #ifdef CONFIG_PRINTK | |
180 | static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write, | |
181 | void __user *buffer, size_t *lenp, loff_t *ppos); | |
182 | #endif | |
183 | ||
184 | static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write, | |
185 | void __user *buffer, size_t *lenp, loff_t *ppos); | |
186 | #ifdef CONFIG_COREDUMP | |
187 | static int proc_dostring_coredump(struct ctl_table *table, int write, | |
188 | void __user *buffer, size_t *lenp, loff_t *ppos); | |
189 | #endif | |
190 | ||
191 | #ifdef CONFIG_MAGIC_SYSRQ | |
192 | /* Note: sysrq code uses it's own private copy */ | |
193 | static int __sysrq_enabled = CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE; | |
194 | ||
195 | static int sysrq_sysctl_handler(ctl_table *table, int write, | |
196 | void __user *buffer, size_t *lenp, | |
197 | loff_t *ppos) | |
198 | { | |
199 | int error; | |
200 | ||
201 | error = proc_dointvec(table, write, buffer, lenp, ppos); | |
202 | if (error) | |
203 | return error; | |
204 | ||
205 | if (write) | |
206 | sysrq_toggle_support(__sysrq_enabled); | |
207 | ||
208 | return 0; | |
209 | } | |
210 | ||
211 | #endif | |
212 | ||
213 | static struct ctl_table kern_table[]; | |
214 | static struct ctl_table vm_table[]; | |
215 | static struct ctl_table fs_table[]; | |
216 | static struct ctl_table debug_table[]; | |
217 | static struct ctl_table dev_table[]; | |
218 | extern struct ctl_table random_table[]; | |
219 | #ifdef CONFIG_EPOLL | |
220 | extern struct ctl_table epoll_table[]; | |
221 | #endif | |
222 | ||
223 | #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT | |
224 | int sysctl_legacy_va_layout; | |
225 | #endif | |
226 | ||
227 | /* The default sysctl tables: */ | |
228 | ||
229 | static struct ctl_table sysctl_base_table[] = { | |
230 | { | |
231 | .procname = "kernel", | |
232 | .mode = 0555, | |
233 | .child = kern_table, | |
234 | }, | |
235 | { | |
236 | .procname = "vm", | |
237 | .mode = 0555, | |
238 | .child = vm_table, | |
239 | }, | |
240 | { | |
241 | .procname = "fs", | |
242 | .mode = 0555, | |
243 | .child = fs_table, | |
244 | }, | |
245 | { | |
246 | .procname = "debug", | |
247 | .mode = 0555, | |
248 | .child = debug_table, | |
249 | }, | |
250 | { | |
251 | .procname = "dev", | |
252 | .mode = 0555, | |
253 | .child = dev_table, | |
254 | }, | |
255 | { } | |
256 | }; | |
257 | ||
258 | #ifdef CONFIG_SCHED_DEBUG | |
259 | static int min_sched_granularity_ns = 100000; /* 100 usecs */ | |
260 | static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */ | |
261 | static int min_wakeup_granularity_ns; /* 0 usecs */ | |
262 | static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */ | |
263 | #ifdef CONFIG_SMP | |
264 | static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE; | |
265 | static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1; | |
266 | #endif /* CONFIG_SMP */ | |
267 | #endif /* CONFIG_SCHED_DEBUG */ | |
268 | ||
269 | #ifdef CONFIG_COMPACTION | |
270 | static int min_extfrag_threshold; | |
271 | static int max_extfrag_threshold = 1000; | |
272 | #endif | |
273 | ||
274 | static struct ctl_table kern_table[] = { | |
275 | { | |
276 | .procname = "sched_child_runs_first", | |
277 | .data = &sysctl_sched_child_runs_first, | |
278 | .maxlen = sizeof(unsigned int), | |
279 | .mode = 0644, | |
280 | .proc_handler = proc_dointvec, | |
281 | }, | |
282 | #ifdef CONFIG_SCHED_DEBUG | |
283 | { | |
284 | .procname = "sched_min_granularity_ns", | |
285 | .data = &sysctl_sched_min_granularity, | |
286 | .maxlen = sizeof(unsigned int), | |
287 | .mode = 0644, | |
288 | .proc_handler = sched_proc_update_handler, | |
289 | .extra1 = &min_sched_granularity_ns, | |
290 | .extra2 = &max_sched_granularity_ns, | |
291 | }, | |
292 | { | |
293 | .procname = "sched_latency_ns", | |
294 | .data = &sysctl_sched_latency, | |
295 | .maxlen = sizeof(unsigned int), | |
296 | .mode = 0644, | |
297 | .proc_handler = sched_proc_update_handler, | |
298 | .extra1 = &min_sched_granularity_ns, | |
299 | .extra2 = &max_sched_granularity_ns, | |
300 | }, | |
301 | { | |
302 | .procname = "sched_wakeup_granularity_ns", | |
303 | .data = &sysctl_sched_wakeup_granularity, | |
304 | .maxlen = sizeof(unsigned int), | |
305 | .mode = 0644, | |
306 | .proc_handler = sched_proc_update_handler, | |
307 | .extra1 = &min_wakeup_granularity_ns, | |
308 | .extra2 = &max_wakeup_granularity_ns, | |
309 | }, | |
310 | #ifdef CONFIG_SMP | |
311 | { | |
312 | .procname = "sched_tunable_scaling", | |
313 | .data = &sysctl_sched_tunable_scaling, | |
314 | .maxlen = sizeof(enum sched_tunable_scaling), | |
315 | .mode = 0644, | |
316 | .proc_handler = sched_proc_update_handler, | |
317 | .extra1 = &min_sched_tunable_scaling, | |
318 | .extra2 = &max_sched_tunable_scaling, | |
319 | }, | |
320 | { | |
321 | .procname = "sched_migration_cost_ns", | |
322 | .data = &sysctl_sched_migration_cost, | |
323 | .maxlen = sizeof(unsigned int), | |
324 | .mode = 0644, | |
325 | .proc_handler = proc_dointvec, | |
326 | }, | |
327 | { | |
328 | .procname = "sched_nr_migrate", | |
329 | .data = &sysctl_sched_nr_migrate, | |
330 | .maxlen = sizeof(unsigned int), | |
331 | .mode = 0644, | |
332 | .proc_handler = proc_dointvec, | |
333 | }, | |
334 | { | |
335 | .procname = "sched_time_avg_ms", | |
336 | .data = &sysctl_sched_time_avg, | |
337 | .maxlen = sizeof(unsigned int), | |
338 | .mode = 0644, | |
339 | .proc_handler = proc_dointvec, | |
340 | }, | |
341 | { | |
342 | .procname = "sched_shares_window_ns", | |
343 | .data = &sysctl_sched_shares_window, | |
344 | .maxlen = sizeof(unsigned int), | |
345 | .mode = 0644, | |
346 | .proc_handler = proc_dointvec, | |
347 | }, | |
348 | { | |
349 | .procname = "timer_migration", | |
350 | .data = &sysctl_timer_migration, | |
351 | .maxlen = sizeof(unsigned int), | |
352 | .mode = 0644, | |
353 | .proc_handler = proc_dointvec_minmax, | |
354 | .extra1 = &zero, | |
355 | .extra2 = &one, | |
356 | }, | |
357 | #endif /* CONFIG_SMP */ | |
358 | #ifdef CONFIG_NUMA_BALANCING | |
359 | { | |
360 | .procname = "numa_balancing_scan_delay_ms", | |
361 | .data = &sysctl_numa_balancing_scan_delay, | |
362 | .maxlen = sizeof(unsigned int), | |
363 | .mode = 0644, | |
364 | .proc_handler = proc_dointvec, | |
365 | }, | |
366 | { | |
367 | .procname = "numa_balancing_scan_period_min_ms", | |
368 | .data = &sysctl_numa_balancing_scan_period_min, | |
369 | .maxlen = sizeof(unsigned int), | |
370 | .mode = 0644, | |
371 | .proc_handler = proc_dointvec, | |
372 | }, | |
373 | { | |
374 | .procname = "numa_balancing_scan_period_max_ms", | |
375 | .data = &sysctl_numa_balancing_scan_period_max, | |
376 | .maxlen = sizeof(unsigned int), | |
377 | .mode = 0644, | |
378 | .proc_handler = proc_dointvec, | |
379 | }, | |
380 | { | |
381 | .procname = "numa_balancing_scan_size_mb", | |
382 | .data = &sysctl_numa_balancing_scan_size, | |
383 | .maxlen = sizeof(unsigned int), | |
384 | .mode = 0644, | |
385 | .proc_handler = proc_dointvec, | |
386 | }, | |
387 | { | |
388 | .procname = "numa_balancing_migrate_deferred", | |
389 | .data = &sysctl_numa_balancing_migrate_deferred, | |
390 | .maxlen = sizeof(unsigned int), | |
391 | .mode = 0644, | |
392 | .proc_handler = proc_dointvec, | |
393 | }, | |
394 | #endif /* CONFIG_NUMA_BALANCING */ | |
395 | #endif /* CONFIG_SCHED_DEBUG */ | |
396 | { | |
397 | .procname = "sched_rt_period_us", | |
398 | .data = &sysctl_sched_rt_period, | |
399 | .maxlen = sizeof(unsigned int), | |
400 | .mode = 0644, | |
401 | .proc_handler = sched_rt_handler, | |
402 | }, | |
403 | { | |
404 | .procname = "sched_rt_runtime_us", | |
405 | .data = &sysctl_sched_rt_runtime, | |
406 | .maxlen = sizeof(int), | |
407 | .mode = 0644, | |
408 | .proc_handler = sched_rt_handler, | |
409 | }, | |
410 | { | |
411 | .procname = "sched_rr_timeslice_ms", | |
412 | .data = &sched_rr_timeslice, | |
413 | .maxlen = sizeof(int), | |
414 | .mode = 0644, | |
415 | .proc_handler = sched_rr_handler, | |
416 | }, | |
417 | #ifdef CONFIG_SCHED_AUTOGROUP | |
418 | { | |
419 | .procname = "sched_autogroup_enabled", | |
420 | .data = &sysctl_sched_autogroup_enabled, | |
421 | .maxlen = sizeof(unsigned int), | |
422 | .mode = 0644, | |
423 | .proc_handler = proc_dointvec_minmax, | |
424 | .extra1 = &zero, | |
425 | .extra2 = &one, | |
426 | }, | |
427 | #endif | |
428 | #ifdef CONFIG_CFS_BANDWIDTH | |
429 | { | |
430 | .procname = "sched_cfs_bandwidth_slice_us", | |
431 | .data = &sysctl_sched_cfs_bandwidth_slice, | |
432 | .maxlen = sizeof(unsigned int), | |
433 | .mode = 0644, | |
434 | .proc_handler = proc_dointvec_minmax, | |
435 | .extra1 = &one, | |
436 | }, | |
437 | #endif | |
438 | #ifdef CONFIG_PROVE_LOCKING | |
439 | { | |
440 | .procname = "prove_locking", | |
441 | .data = &prove_locking, | |
442 | .maxlen = sizeof(int), | |
443 | .mode = 0644, | |
444 | .proc_handler = proc_dointvec, | |
445 | }, | |
446 | #endif | |
447 | #ifdef CONFIG_LOCK_STAT | |
448 | { | |
449 | .procname = "lock_stat", | |
450 | .data = &lock_stat, | |
451 | .maxlen = sizeof(int), | |
452 | .mode = 0644, | |
453 | .proc_handler = proc_dointvec, | |
454 | }, | |
455 | #endif | |
456 | { | |
457 | .procname = "panic", | |
458 | .data = &panic_timeout, | |
459 | .maxlen = sizeof(int), | |
460 | .mode = 0644, | |
461 | .proc_handler = proc_dointvec, | |
462 | }, | |
463 | #ifdef CONFIG_COREDUMP | |
464 | { | |
465 | .procname = "core_uses_pid", | |
466 | .data = &core_uses_pid, | |
467 | .maxlen = sizeof(int), | |
468 | .mode = 0644, | |
469 | .proc_handler = proc_dointvec, | |
470 | }, | |
471 | { | |
472 | .procname = "core_pattern", | |
473 | .data = core_pattern, | |
474 | .maxlen = CORENAME_MAX_SIZE, | |
475 | .mode = 0644, | |
476 | .proc_handler = proc_dostring_coredump, | |
477 | }, | |
478 | { | |
479 | .procname = "core_pipe_limit", | |
480 | .data = &core_pipe_limit, | |
481 | .maxlen = sizeof(unsigned int), | |
482 | .mode = 0644, | |
483 | .proc_handler = proc_dointvec, | |
484 | }, | |
485 | #endif | |
486 | #ifdef CONFIG_PROC_SYSCTL | |
487 | { | |
488 | .procname = "tainted", | |
489 | .maxlen = sizeof(long), | |
490 | .mode = 0644, | |
491 | .proc_handler = proc_taint, | |
492 | }, | |
493 | #endif | |
494 | #ifdef CONFIG_LATENCYTOP | |
495 | { | |
496 | .procname = "latencytop", | |
497 | .data = &latencytop_enabled, | |
498 | .maxlen = sizeof(int), | |
499 | .mode = 0644, | |
500 | .proc_handler = proc_dointvec, | |
501 | }, | |
502 | #endif | |
503 | #ifdef CONFIG_BLK_DEV_INITRD | |
504 | { | |
505 | .procname = "real-root-dev", | |
506 | .data = &real_root_dev, | |
507 | .maxlen = sizeof(int), | |
508 | .mode = 0644, | |
509 | .proc_handler = proc_dointvec, | |
510 | }, | |
511 | #endif | |
512 | { | |
513 | .procname = "print-fatal-signals", | |
514 | .data = &print_fatal_signals, | |
515 | .maxlen = sizeof(int), | |
516 | .mode = 0644, | |
517 | .proc_handler = proc_dointvec, | |
518 | }, | |
519 | #ifdef CONFIG_SPARC | |
520 | { | |
521 | .procname = "reboot-cmd", | |
522 | .data = reboot_command, | |
523 | .maxlen = 256, | |
524 | .mode = 0644, | |
525 | .proc_handler = proc_dostring, | |
526 | }, | |
527 | { | |
528 | .procname = "stop-a", | |
529 | .data = &stop_a_enabled, | |
530 | .maxlen = sizeof (int), | |
531 | .mode = 0644, | |
532 | .proc_handler = proc_dointvec, | |
533 | }, | |
534 | { | |
535 | .procname = "scons-poweroff", | |
536 | .data = &scons_pwroff, | |
537 | .maxlen = sizeof (int), | |
538 | .mode = 0644, | |
539 | .proc_handler = proc_dointvec, | |
540 | }, | |
541 | #endif | |
542 | #ifdef CONFIG_SPARC64 | |
543 | { | |
544 | .procname = "tsb-ratio", | |
545 | .data = &sysctl_tsb_ratio, | |
546 | .maxlen = sizeof (int), | |
547 | .mode = 0644, | |
548 | .proc_handler = proc_dointvec, | |
549 | }, | |
550 | #endif | |
551 | #ifdef __hppa__ | |
552 | { | |
553 | .procname = "soft-power", | |
554 | .data = &pwrsw_enabled, | |
555 | .maxlen = sizeof (int), | |
556 | .mode = 0644, | |
557 | .proc_handler = proc_dointvec, | |
558 | }, | |
559 | #endif | |
560 | #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW | |
561 | { | |
562 | .procname = "unaligned-trap", | |
563 | .data = &unaligned_enabled, | |
564 | .maxlen = sizeof (int), | |
565 | .mode = 0644, | |
566 | .proc_handler = proc_dointvec, | |
567 | }, | |
568 | #endif | |
569 | { | |
570 | .procname = "ctrl-alt-del", | |
571 | .data = &C_A_D, | |
572 | .maxlen = sizeof(int), | |
573 | .mode = 0644, | |
574 | .proc_handler = proc_dointvec, | |
575 | }, | |
576 | #ifdef CONFIG_FUNCTION_TRACER | |
577 | { | |
578 | .procname = "ftrace_enabled", | |
579 | .data = &ftrace_enabled, | |
580 | .maxlen = sizeof(int), | |
581 | .mode = 0644, | |
582 | .proc_handler = ftrace_enable_sysctl, | |
583 | }, | |
584 | #endif | |
585 | #ifdef CONFIG_STACK_TRACER | |
586 | { | |
587 | .procname = "stack_tracer_enabled", | |
588 | .data = &stack_tracer_enabled, | |
589 | .maxlen = sizeof(int), | |
590 | .mode = 0644, | |
591 | .proc_handler = stack_trace_sysctl, | |
592 | }, | |
593 | #endif | |
594 | #ifdef CONFIG_TRACING | |
595 | { | |
596 | .procname = "ftrace_dump_on_oops", | |
597 | .data = &ftrace_dump_on_oops, | |
598 | .maxlen = sizeof(int), | |
599 | .mode = 0644, | |
600 | .proc_handler = proc_dointvec, | |
601 | }, | |
602 | { | |
603 | .procname = "traceoff_on_warning", | |
604 | .data = &__disable_trace_on_warning, | |
605 | .maxlen = sizeof(__disable_trace_on_warning), | |
606 | .mode = 0644, | |
607 | .proc_handler = proc_dointvec, | |
608 | }, | |
609 | #endif | |
610 | #ifdef CONFIG_MODULES | |
611 | { | |
612 | .procname = "modprobe", | |
613 | .data = &modprobe_path, | |
614 | .maxlen = KMOD_PATH_LEN, | |
615 | .mode = 0644, | |
616 | .proc_handler = proc_dostring, | |
617 | }, | |
618 | { | |
619 | .procname = "modules_disabled", | |
620 | .data = &modules_disabled, | |
621 | .maxlen = sizeof(int), | |
622 | .mode = 0644, | |
623 | /* only handle a transition from default "0" to "1" */ | |
624 | .proc_handler = proc_dointvec_minmax, | |
625 | .extra1 = &one, | |
626 | .extra2 = &one, | |
627 | }, | |
628 | #endif | |
629 | ||
630 | { | |
631 | .procname = "hotplug", | |
632 | .data = &uevent_helper, | |
633 | .maxlen = UEVENT_HELPER_PATH_LEN, | |
634 | .mode = 0644, | |
635 | .proc_handler = proc_dostring, | |
636 | }, | |
637 | ||
638 | #ifdef CONFIG_CHR_DEV_SG | |
639 | { | |
640 | .procname = "sg-big-buff", | |
641 | .data = &sg_big_buff, | |
642 | .maxlen = sizeof (int), | |
643 | .mode = 0444, | |
644 | .proc_handler = proc_dointvec, | |
645 | }, | |
646 | #endif | |
647 | #ifdef CONFIG_BSD_PROCESS_ACCT | |
648 | { | |
649 | .procname = "acct", | |
650 | .data = &acct_parm, | |
651 | .maxlen = 3*sizeof(int), | |
652 | .mode = 0644, | |
653 | .proc_handler = proc_dointvec, | |
654 | }, | |
655 | #endif | |
656 | #ifdef CONFIG_MAGIC_SYSRQ | |
657 | { | |
658 | .procname = "sysrq", | |
659 | .data = &__sysrq_enabled, | |
660 | .maxlen = sizeof (int), | |
661 | .mode = 0644, | |
662 | .proc_handler = sysrq_sysctl_handler, | |
663 | }, | |
664 | #endif | |
665 | #ifdef CONFIG_PROC_SYSCTL | |
666 | { | |
667 | .procname = "cad_pid", | |
668 | .data = NULL, | |
669 | .maxlen = sizeof (int), | |
670 | .mode = 0600, | |
671 | .proc_handler = proc_do_cad_pid, | |
672 | }, | |
673 | #endif | |
674 | { | |
675 | .procname = "threads-max", | |
676 | .data = &max_threads, | |
677 | .maxlen = sizeof(int), | |
678 | .mode = 0644, | |
679 | .proc_handler = proc_dointvec, | |
680 | }, | |
681 | { | |
682 | .procname = "random", | |
683 | .mode = 0555, | |
684 | .child = random_table, | |
685 | }, | |
686 | { | |
687 | .procname = "usermodehelper", | |
688 | .mode = 0555, | |
689 | .child = usermodehelper_table, | |
690 | }, | |
691 | { | |
692 | .procname = "overflowuid", | |
693 | .data = &overflowuid, | |
694 | .maxlen = sizeof(int), | |
695 | .mode = 0644, | |
696 | .proc_handler = proc_dointvec_minmax, | |
697 | .extra1 = &minolduid, | |
698 | .extra2 = &maxolduid, | |
699 | }, | |
700 | { | |
701 | .procname = "overflowgid", | |
702 | .data = &overflowgid, | |
703 | .maxlen = sizeof(int), | |
704 | .mode = 0644, | |
705 | .proc_handler = proc_dointvec_minmax, | |
706 | .extra1 = &minolduid, | |
707 | .extra2 = &maxolduid, | |
708 | }, | |
709 | #ifdef CONFIG_S390 | |
710 | #ifdef CONFIG_MATHEMU | |
711 | { | |
712 | .procname = "ieee_emulation_warnings", | |
713 | .data = &sysctl_ieee_emulation_warnings, | |
714 | .maxlen = sizeof(int), | |
715 | .mode = 0644, | |
716 | .proc_handler = proc_dointvec, | |
717 | }, | |
718 | #endif | |
719 | { | |
720 | .procname = "userprocess_debug", | |
721 | .data = &show_unhandled_signals, | |
722 | .maxlen = sizeof(int), | |
723 | .mode = 0644, | |
724 | .proc_handler = proc_dointvec, | |
725 | }, | |
726 | #endif | |
727 | { | |
728 | .procname = "pid_max", | |
729 | .data = &pid_max, | |
730 | .maxlen = sizeof (int), | |
731 | .mode = 0644, | |
732 | .proc_handler = proc_dointvec_minmax, | |
733 | .extra1 = &pid_max_min, | |
734 | .extra2 = &pid_max_max, | |
735 | }, | |
736 | { | |
737 | .procname = "panic_on_oops", | |
738 | .data = &panic_on_oops, | |
739 | .maxlen = sizeof(int), | |
740 | .mode = 0644, | |
741 | .proc_handler = proc_dointvec, | |
742 | }, | |
743 | #if defined CONFIG_PRINTK | |
744 | { | |
745 | .procname = "printk", | |
746 | .data = &console_loglevel, | |
747 | .maxlen = 4*sizeof(int), | |
748 | .mode = 0644, | |
749 | .proc_handler = proc_dointvec, | |
750 | }, | |
751 | { | |
752 | .procname = "printk_ratelimit", | |
753 | .data = &printk_ratelimit_state.interval, | |
754 | .maxlen = sizeof(int), | |
755 | .mode = 0644, | |
756 | .proc_handler = proc_dointvec_jiffies, | |
757 | }, | |
758 | { | |
759 | .procname = "printk_ratelimit_burst", | |
760 | .data = &printk_ratelimit_state.burst, | |
761 | .maxlen = sizeof(int), | |
762 | .mode = 0644, | |
763 | .proc_handler = proc_dointvec, | |
764 | }, | |
765 | { | |
766 | .procname = "printk_delay", | |
767 | .data = &printk_delay_msec, | |
768 | .maxlen = sizeof(int), | |
769 | .mode = 0644, | |
770 | .proc_handler = proc_dointvec_minmax, | |
771 | .extra1 = &zero, | |
772 | .extra2 = &ten_thousand, | |
773 | }, | |
774 | { | |
775 | .procname = "dmesg_restrict", | |
776 | .data = &dmesg_restrict, | |
777 | .maxlen = sizeof(int), | |
778 | .mode = 0644, | |
779 | .proc_handler = proc_dointvec_minmax_sysadmin, | |
780 | .extra1 = &zero, | |
781 | .extra2 = &one, | |
782 | }, | |
783 | { | |
784 | .procname = "kptr_restrict", | |
785 | .data = &kptr_restrict, | |
786 | .maxlen = sizeof(int), | |
787 | .mode = 0644, | |
788 | .proc_handler = proc_dointvec_minmax_sysadmin, | |
789 | .extra1 = &zero, | |
790 | .extra2 = &two, | |
791 | }, | |
792 | #endif | |
793 | { | |
794 | .procname = "ngroups_max", | |
795 | .data = &ngroups_max, | |
796 | .maxlen = sizeof (int), | |
797 | .mode = 0444, | |
798 | .proc_handler = proc_dointvec, | |
799 | }, | |
800 | { | |
801 | .procname = "cap_last_cap", | |
802 | .data = (void *)&cap_last_cap, | |
803 | .maxlen = sizeof(int), | |
804 | .mode = 0444, | |
805 | .proc_handler = proc_dointvec, | |
806 | }, | |
807 | #if defined(CONFIG_LOCKUP_DETECTOR) | |
808 | { | |
809 | .procname = "watchdog", | |
810 | .data = &watchdog_user_enabled, | |
811 | .maxlen = sizeof (int), | |
812 | .mode = 0644, | |
813 | .proc_handler = proc_dowatchdog, | |
814 | .extra1 = &zero, | |
815 | .extra2 = &one, | |
816 | }, | |
817 | { | |
818 | .procname = "watchdog_thresh", | |
819 | .data = &watchdog_thresh, | |
820 | .maxlen = sizeof(int), | |
821 | .mode = 0644, | |
822 | .proc_handler = proc_dowatchdog, | |
823 | .extra1 = &zero, | |
824 | .extra2 = &sixty, | |
825 | }, | |
826 | { | |
827 | .procname = "softlockup_panic", | |
828 | .data = &softlockup_panic, | |
829 | .maxlen = sizeof(int), | |
830 | .mode = 0644, | |
831 | .proc_handler = proc_dointvec_minmax, | |
832 | .extra1 = &zero, | |
833 | .extra2 = &one, | |
834 | }, | |
835 | { | |
836 | .procname = "nmi_watchdog", | |
837 | .data = &watchdog_user_enabled, | |
838 | .maxlen = sizeof (int), | |
839 | .mode = 0644, | |
840 | .proc_handler = proc_dowatchdog, | |
841 | .extra1 = &zero, | |
842 | .extra2 = &one, | |
843 | }, | |
844 | #endif | |
845 | #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86) | |
846 | { | |
847 | .procname = "unknown_nmi_panic", | |
848 | .data = &unknown_nmi_panic, | |
849 | .maxlen = sizeof (int), | |
850 | .mode = 0644, | |
851 | .proc_handler = proc_dointvec, | |
852 | }, | |
853 | #endif | |
854 | #if defined(CONFIG_X86) | |
855 | { | |
856 | .procname = "panic_on_unrecovered_nmi", | |
857 | .data = &panic_on_unrecovered_nmi, | |
858 | .maxlen = sizeof(int), | |
859 | .mode = 0644, | |
860 | .proc_handler = proc_dointvec, | |
861 | }, | |
862 | { | |
863 | .procname = "panic_on_io_nmi", | |
864 | .data = &panic_on_io_nmi, | |
865 | .maxlen = sizeof(int), | |
866 | .mode = 0644, | |
867 | .proc_handler = proc_dointvec, | |
868 | }, | |
869 | #ifdef CONFIG_DEBUG_STACKOVERFLOW | |
870 | { | |
871 | .procname = "panic_on_stackoverflow", | |
872 | .data = &sysctl_panic_on_stackoverflow, | |
873 | .maxlen = sizeof(int), | |
874 | .mode = 0644, | |
875 | .proc_handler = proc_dointvec, | |
876 | }, | |
877 | #endif | |
878 | { | |
879 | .procname = "bootloader_type", | |
880 | .data = &bootloader_type, | |
881 | .maxlen = sizeof (int), | |
882 | .mode = 0444, | |
883 | .proc_handler = proc_dointvec, | |
884 | }, | |
885 | { | |
886 | .procname = "bootloader_version", | |
887 | .data = &bootloader_version, | |
888 | .maxlen = sizeof (int), | |
889 | .mode = 0444, | |
890 | .proc_handler = proc_dointvec, | |
891 | }, | |
892 | { | |
893 | .procname = "kstack_depth_to_print", | |
894 | .data = &kstack_depth_to_print, | |
895 | .maxlen = sizeof(int), | |
896 | .mode = 0644, | |
897 | .proc_handler = proc_dointvec, | |
898 | }, | |
899 | { | |
900 | .procname = "io_delay_type", | |
901 | .data = &io_delay_type, | |
902 | .maxlen = sizeof(int), | |
903 | .mode = 0644, | |
904 | .proc_handler = proc_dointvec, | |
905 | }, | |
906 | #endif | |
907 | #if defined(CONFIG_MMU) | |
908 | { | |
909 | .procname = "randomize_va_space", | |
910 | .data = &randomize_va_space, | |
911 | .maxlen = sizeof(int), | |
912 | .mode = 0644, | |
913 | .proc_handler = proc_dointvec, | |
914 | }, | |
915 | #endif | |
916 | #if defined(CONFIG_S390) && defined(CONFIG_SMP) | |
917 | { | |
918 | .procname = "spin_retry", | |
919 | .data = &spin_retry, | |
920 | .maxlen = sizeof (int), | |
921 | .mode = 0644, | |
922 | .proc_handler = proc_dointvec, | |
923 | }, | |
924 | #endif | |
925 | #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86) | |
926 | { | |
927 | .procname = "acpi_video_flags", | |
928 | .data = &acpi_realmode_flags, | |
929 | .maxlen = sizeof (unsigned long), | |
930 | .mode = 0644, | |
931 | .proc_handler = proc_doulongvec_minmax, | |
932 | }, | |
933 | #endif | |
934 | #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN | |
935 | { | |
936 | .procname = "ignore-unaligned-usertrap", | |
937 | .data = &no_unaligned_warning, | |
938 | .maxlen = sizeof (int), | |
939 | .mode = 0644, | |
940 | .proc_handler = proc_dointvec, | |
941 | }, | |
942 | #endif | |
943 | #ifdef CONFIG_IA64 | |
944 | { | |
945 | .procname = "unaligned-dump-stack", | |
946 | .data = &unaligned_dump_stack, | |
947 | .maxlen = sizeof (int), | |
948 | .mode = 0644, | |
949 | .proc_handler = proc_dointvec, | |
950 | }, | |
951 | #endif | |
952 | #ifdef CONFIG_DETECT_HUNG_TASK | |
953 | { | |
954 | .procname = "hung_task_panic", | |
955 | .data = &sysctl_hung_task_panic, | |
956 | .maxlen = sizeof(int), | |
957 | .mode = 0644, | |
958 | .proc_handler = proc_dointvec_minmax, | |
959 | .extra1 = &zero, | |
960 | .extra2 = &one, | |
961 | }, | |
962 | { | |
963 | .procname = "hung_task_check_count", | |
964 | .data = &sysctl_hung_task_check_count, | |
965 | .maxlen = sizeof(int), | |
966 | .mode = 0644, | |
967 | .proc_handler = proc_dointvec_minmax, | |
968 | .extra1 = &zero, | |
969 | }, | |
970 | { | |
971 | .procname = "hung_task_timeout_secs", | |
972 | .data = &sysctl_hung_task_timeout_secs, | |
973 | .maxlen = sizeof(unsigned long), | |
974 | .mode = 0644, | |
975 | .proc_handler = proc_dohung_task_timeout_secs, | |
976 | }, | |
977 | { | |
978 | .procname = "hung_task_warnings", | |
979 | .data = &sysctl_hung_task_warnings, | |
980 | .maxlen = sizeof(unsigned long), | |
981 | .mode = 0644, | |
982 | .proc_handler = proc_doulongvec_minmax, | |
983 | }, | |
984 | #endif | |
985 | #ifdef CONFIG_COMPAT | |
986 | { | |
987 | .procname = "compat-log", | |
988 | .data = &compat_log, | |
989 | .maxlen = sizeof (int), | |
990 | .mode = 0644, | |
991 | .proc_handler = proc_dointvec, | |
992 | }, | |
993 | #endif | |
994 | #ifdef CONFIG_RT_MUTEXES | |
995 | { | |
996 | .procname = "max_lock_depth", | |
997 | .data = &max_lock_depth, | |
998 | .maxlen = sizeof(int), | |
999 | .mode = 0644, | |
1000 | .proc_handler = proc_dointvec, | |
1001 | }, | |
1002 | #endif | |
1003 | { | |
1004 | .procname = "poweroff_cmd", | |
1005 | .data = &poweroff_cmd, | |
1006 | .maxlen = POWEROFF_CMD_PATH_LEN, | |
1007 | .mode = 0644, | |
1008 | .proc_handler = proc_dostring, | |
1009 | }, | |
1010 | #ifdef CONFIG_KEYS | |
1011 | { | |
1012 | .procname = "keys", | |
1013 | .mode = 0555, | |
1014 | .child = key_sysctls, | |
1015 | }, | |
1016 | #endif | |
1017 | #ifdef CONFIG_RCU_TORTURE_TEST | |
1018 | { | |
1019 | .procname = "rcutorture_runnable", | |
1020 | .data = &rcutorture_runnable, | |
1021 | .maxlen = sizeof(int), | |
1022 | .mode = 0644, | |
1023 | .proc_handler = proc_dointvec, | |
1024 | }, | |
1025 | #endif | |
1026 | #ifdef CONFIG_PERF_EVENTS | |
1027 | /* | |
1028 | * User-space scripts rely on the existence of this file | |
1029 | * as a feature check for perf_events being enabled. | |
1030 | * | |
1031 | * So it's an ABI, do not remove! | |
1032 | */ | |
1033 | { | |
1034 | .procname = "perf_event_paranoid", | |
1035 | .data = &sysctl_perf_event_paranoid, | |
1036 | .maxlen = sizeof(sysctl_perf_event_paranoid), | |
1037 | .mode = 0644, | |
1038 | .proc_handler = proc_dointvec, | |
1039 | }, | |
1040 | { | |
1041 | .procname = "perf_event_mlock_kb", | |
1042 | .data = &sysctl_perf_event_mlock, | |
1043 | .maxlen = sizeof(sysctl_perf_event_mlock), | |
1044 | .mode = 0644, | |
1045 | .proc_handler = proc_dointvec, | |
1046 | }, | |
1047 | { | |
1048 | .procname = "perf_event_max_sample_rate", | |
1049 | .data = &sysctl_perf_event_sample_rate, | |
1050 | .maxlen = sizeof(sysctl_perf_event_sample_rate), | |
1051 | .mode = 0644, | |
1052 | .proc_handler = perf_proc_update_handler, | |
1053 | .extra1 = &one, | |
1054 | }, | |
1055 | { | |
1056 | .procname = "perf_cpu_time_max_percent", | |
1057 | .data = &sysctl_perf_cpu_time_max_percent, | |
1058 | .maxlen = sizeof(sysctl_perf_cpu_time_max_percent), | |
1059 | .mode = 0644, | |
1060 | .proc_handler = perf_cpu_time_max_percent_handler, | |
1061 | .extra1 = &zero, | |
1062 | .extra2 = &one_hundred, | |
1063 | }, | |
1064 | #endif | |
1065 | #ifdef CONFIG_KMEMCHECK | |
1066 | { | |
1067 | .procname = "kmemcheck", | |
1068 | .data = &kmemcheck_enabled, | |
1069 | .maxlen = sizeof(int), | |
1070 | .mode = 0644, | |
1071 | .proc_handler = proc_dointvec, | |
1072 | }, | |
1073 | #endif | |
1074 | #ifdef CONFIG_BLOCK | |
1075 | { | |
1076 | .procname = "blk_iopoll", | |
1077 | .data = &blk_iopoll_enabled, | |
1078 | .maxlen = sizeof(int), | |
1079 | .mode = 0644, | |
1080 | .proc_handler = proc_dointvec, | |
1081 | }, | |
1082 | #endif | |
1083 | { } | |
1084 | }; | |
1085 | ||
1086 | static struct ctl_table vm_table[] = { | |
1087 | { | |
1088 | .procname = "overcommit_memory", | |
1089 | .data = &sysctl_overcommit_memory, | |
1090 | .maxlen = sizeof(sysctl_overcommit_memory), | |
1091 | .mode = 0644, | |
1092 | .proc_handler = proc_dointvec_minmax, | |
1093 | .extra1 = &zero, | |
1094 | .extra2 = &two, | |
1095 | }, | |
1096 | { | |
1097 | .procname = "panic_on_oom", | |
1098 | .data = &sysctl_panic_on_oom, | |
1099 | .maxlen = sizeof(sysctl_panic_on_oom), | |
1100 | .mode = 0644, | |
1101 | .proc_handler = proc_dointvec_minmax, | |
1102 | .extra1 = &zero, | |
1103 | .extra2 = &two, | |
1104 | }, | |
1105 | { | |
1106 | .procname = "oom_kill_allocating_task", | |
1107 | .data = &sysctl_oom_kill_allocating_task, | |
1108 | .maxlen = sizeof(sysctl_oom_kill_allocating_task), | |
1109 | .mode = 0644, | |
1110 | .proc_handler = proc_dointvec, | |
1111 | }, | |
1112 | { | |
1113 | .procname = "oom_dump_tasks", | |
1114 | .data = &sysctl_oom_dump_tasks, | |
1115 | .maxlen = sizeof(sysctl_oom_dump_tasks), | |
1116 | .mode = 0644, | |
1117 | .proc_handler = proc_dointvec, | |
1118 | }, | |
1119 | { | |
1120 | .procname = "overcommit_ratio", | |
1121 | .data = &sysctl_overcommit_ratio, | |
1122 | .maxlen = sizeof(sysctl_overcommit_ratio), | |
1123 | .mode = 0644, | |
1124 | .proc_handler = proc_dointvec, | |
1125 | }, | |
1126 | { | |
1127 | .procname = "page-cluster", | |
1128 | .data = &page_cluster, | |
1129 | .maxlen = sizeof(int), | |
1130 | .mode = 0644, | |
1131 | .proc_handler = proc_dointvec_minmax, | |
1132 | .extra1 = &zero, | |
1133 | }, | |
1134 | { | |
1135 | .procname = "dirty_background_ratio", | |
1136 | .data = &dirty_background_ratio, | |
1137 | .maxlen = sizeof(dirty_background_ratio), | |
1138 | .mode = 0644, | |
1139 | .proc_handler = dirty_background_ratio_handler, | |
1140 | .extra1 = &zero, | |
1141 | .extra2 = &one_hundred, | |
1142 | }, | |
1143 | { | |
1144 | .procname = "dirty_background_bytes", | |
1145 | .data = &dirty_background_bytes, | |
1146 | .maxlen = sizeof(dirty_background_bytes), | |
1147 | .mode = 0644, | |
1148 | .proc_handler = dirty_background_bytes_handler, | |
1149 | .extra1 = &one_ul, | |
1150 | }, | |
1151 | { | |
1152 | .procname = "dirty_ratio", | |
1153 | .data = &vm_dirty_ratio, | |
1154 | .maxlen = sizeof(vm_dirty_ratio), | |
1155 | .mode = 0644, | |
1156 | .proc_handler = dirty_ratio_handler, | |
1157 | .extra1 = &zero, | |
1158 | .extra2 = &one_hundred, | |
1159 | }, | |
1160 | { | |
1161 | .procname = "dirty_bytes", | |
1162 | .data = &vm_dirty_bytes, | |
1163 | .maxlen = sizeof(vm_dirty_bytes), | |
1164 | .mode = 0644, | |
1165 | .proc_handler = dirty_bytes_handler, | |
1166 | .extra1 = &dirty_bytes_min, | |
1167 | }, | |
1168 | { | |
1169 | .procname = "dirty_writeback_centisecs", | |
1170 | .data = &dirty_writeback_interval, | |
1171 | .maxlen = sizeof(dirty_writeback_interval), | |
1172 | .mode = 0644, | |
1173 | .proc_handler = dirty_writeback_centisecs_handler, | |
1174 | }, | |
1175 | { | |
1176 | .procname = "dirty_expire_centisecs", | |
1177 | .data = &dirty_expire_interval, | |
1178 | .maxlen = sizeof(dirty_expire_interval), | |
1179 | .mode = 0644, | |
1180 | .proc_handler = proc_dointvec_minmax, | |
1181 | .extra1 = &zero, | |
1182 | }, | |
1183 | { | |
1184 | .procname = "nr_pdflush_threads", | |
1185 | .mode = 0444 /* read-only */, | |
1186 | .proc_handler = pdflush_proc_obsolete, | |
1187 | }, | |
1188 | { | |
1189 | .procname = "swappiness", | |
1190 | .data = &vm_swappiness, | |
1191 | .maxlen = sizeof(vm_swappiness), | |
1192 | .mode = 0644, | |
1193 | .proc_handler = proc_dointvec_minmax, | |
1194 | .extra1 = &zero, | |
1195 | .extra2 = &one_hundred, | |
1196 | }, | |
1197 | #ifdef CONFIG_HUGETLB_PAGE | |
1198 | { | |
1199 | .procname = "nr_hugepages", | |
1200 | .data = NULL, | |
1201 | .maxlen = sizeof(unsigned long), | |
1202 | .mode = 0644, | |
1203 | .proc_handler = hugetlb_sysctl_handler, | |
1204 | .extra1 = (void *)&hugetlb_zero, | |
1205 | .extra2 = (void *)&hugetlb_infinity, | |
1206 | }, | |
1207 | #ifdef CONFIG_NUMA | |
1208 | { | |
1209 | .procname = "nr_hugepages_mempolicy", | |
1210 | .data = NULL, | |
1211 | .maxlen = sizeof(unsigned long), | |
1212 | .mode = 0644, | |
1213 | .proc_handler = &hugetlb_mempolicy_sysctl_handler, | |
1214 | .extra1 = (void *)&hugetlb_zero, | |
1215 | .extra2 = (void *)&hugetlb_infinity, | |
1216 | }, | |
1217 | #endif | |
1218 | { | |
1219 | .procname = "hugetlb_shm_group", | |
1220 | .data = &sysctl_hugetlb_shm_group, | |
1221 | .maxlen = sizeof(gid_t), | |
1222 | .mode = 0644, | |
1223 | .proc_handler = proc_dointvec, | |
1224 | }, | |
1225 | { | |
1226 | .procname = "hugepages_treat_as_movable", | |
1227 | .data = &hugepages_treat_as_movable, | |
1228 | .maxlen = sizeof(int), | |
1229 | .mode = 0644, | |
1230 | .proc_handler = proc_dointvec, | |
1231 | }, | |
1232 | { | |
1233 | .procname = "nr_overcommit_hugepages", | |
1234 | .data = NULL, | |
1235 | .maxlen = sizeof(unsigned long), | |
1236 | .mode = 0644, | |
1237 | .proc_handler = hugetlb_overcommit_handler, | |
1238 | .extra1 = (void *)&hugetlb_zero, | |
1239 | .extra2 = (void *)&hugetlb_infinity, | |
1240 | }, | |
1241 | #endif | |
1242 | { | |
1243 | .procname = "lowmem_reserve_ratio", | |
1244 | .data = &sysctl_lowmem_reserve_ratio, | |
1245 | .maxlen = sizeof(sysctl_lowmem_reserve_ratio), | |
1246 | .mode = 0644, | |
1247 | .proc_handler = lowmem_reserve_ratio_sysctl_handler, | |
1248 | }, | |
1249 | { | |
1250 | .procname = "drop_caches", | |
1251 | .data = &sysctl_drop_caches, | |
1252 | .maxlen = sizeof(int), | |
1253 | .mode = 0644, | |
1254 | .proc_handler = drop_caches_sysctl_handler, | |
1255 | .extra1 = &one, | |
1256 | .extra2 = &three, | |
1257 | }, | |
1258 | #ifdef CONFIG_COMPACTION | |
1259 | { | |
1260 | .procname = "compact_memory", | |
1261 | .data = &sysctl_compact_memory, | |
1262 | .maxlen = sizeof(int), | |
1263 | .mode = 0200, | |
1264 | .proc_handler = sysctl_compaction_handler, | |
1265 | }, | |
1266 | { | |
1267 | .procname = "extfrag_threshold", | |
1268 | .data = &sysctl_extfrag_threshold, | |
1269 | .maxlen = sizeof(int), | |
1270 | .mode = 0644, | |
1271 | .proc_handler = sysctl_extfrag_handler, | |
1272 | .extra1 = &min_extfrag_threshold, | |
1273 | .extra2 = &max_extfrag_threshold, | |
1274 | }, | |
1275 | ||
1276 | #endif /* CONFIG_COMPACTION */ | |
1277 | { | |
1278 | .procname = "min_free_kbytes", | |
1279 | .data = &min_free_kbytes, | |
1280 | .maxlen = sizeof(min_free_kbytes), | |
1281 | .mode = 0644, | |
1282 | .proc_handler = min_free_kbytes_sysctl_handler, | |
1283 | .extra1 = &zero, | |
1284 | }, | |
1285 | { | |
1286 | .procname = "percpu_pagelist_fraction", | |
1287 | .data = &percpu_pagelist_fraction, | |
1288 | .maxlen = sizeof(percpu_pagelist_fraction), | |
1289 | .mode = 0644, | |
1290 | .proc_handler = percpu_pagelist_fraction_sysctl_handler, | |
1291 | .extra1 = &min_percpu_pagelist_fract, | |
1292 | }, | |
1293 | #ifdef CONFIG_MMU | |
1294 | { | |
1295 | .procname = "max_map_count", | |
1296 | .data = &sysctl_max_map_count, | |
1297 | .maxlen = sizeof(sysctl_max_map_count), | |
1298 | .mode = 0644, | |
1299 | .proc_handler = proc_dointvec_minmax, | |
1300 | .extra1 = &zero, | |
1301 | }, | |
1302 | #else | |
1303 | { | |
1304 | .procname = "nr_trim_pages", | |
1305 | .data = &sysctl_nr_trim_pages, | |
1306 | .maxlen = sizeof(sysctl_nr_trim_pages), | |
1307 | .mode = 0644, | |
1308 | .proc_handler = proc_dointvec_minmax, | |
1309 | .extra1 = &zero, | |
1310 | }, | |
1311 | #endif | |
1312 | { | |
1313 | .procname = "laptop_mode", | |
1314 | .data = &laptop_mode, | |
1315 | .maxlen = sizeof(laptop_mode), | |
1316 | .mode = 0644, | |
1317 | .proc_handler = proc_dointvec_jiffies, | |
1318 | }, | |
1319 | { | |
1320 | .procname = "block_dump", | |
1321 | .data = &block_dump, | |
1322 | .maxlen = sizeof(block_dump), | |
1323 | .mode = 0644, | |
1324 | .proc_handler = proc_dointvec, | |
1325 | .extra1 = &zero, | |
1326 | }, | |
1327 | { | |
1328 | .procname = "vfs_cache_pressure", | |
1329 | .data = &sysctl_vfs_cache_pressure, | |
1330 | .maxlen = sizeof(sysctl_vfs_cache_pressure), | |
1331 | .mode = 0644, | |
1332 | .proc_handler = proc_dointvec, | |
1333 | .extra1 = &zero, | |
1334 | }, | |
1335 | #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT | |
1336 | { | |
1337 | .procname = "legacy_va_layout", | |
1338 | .data = &sysctl_legacy_va_layout, | |
1339 | .maxlen = sizeof(sysctl_legacy_va_layout), | |
1340 | .mode = 0644, | |
1341 | .proc_handler = proc_dointvec, | |
1342 | .extra1 = &zero, | |
1343 | }, | |
1344 | #endif | |
1345 | #ifdef CONFIG_NUMA | |
1346 | { | |
1347 | .procname = "zone_reclaim_mode", | |
1348 | .data = &zone_reclaim_mode, | |
1349 | .maxlen = sizeof(zone_reclaim_mode), | |
1350 | .mode = 0644, | |
1351 | .proc_handler = proc_dointvec, | |
1352 | .extra1 = &zero, | |
1353 | }, | |
1354 | { | |
1355 | .procname = "min_unmapped_ratio", | |
1356 | .data = &sysctl_min_unmapped_ratio, | |
1357 | .maxlen = sizeof(sysctl_min_unmapped_ratio), | |
1358 | .mode = 0644, | |
1359 | .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler, | |
1360 | .extra1 = &zero, | |
1361 | .extra2 = &one_hundred, | |
1362 | }, | |
1363 | { | |
1364 | .procname = "min_slab_ratio", | |
1365 | .data = &sysctl_min_slab_ratio, | |
1366 | .maxlen = sizeof(sysctl_min_slab_ratio), | |
1367 | .mode = 0644, | |
1368 | .proc_handler = sysctl_min_slab_ratio_sysctl_handler, | |
1369 | .extra1 = &zero, | |
1370 | .extra2 = &one_hundred, | |
1371 | }, | |
1372 | #endif | |
1373 | #ifdef CONFIG_SMP | |
1374 | { | |
1375 | .procname = "stat_interval", | |
1376 | .data = &sysctl_stat_interval, | |
1377 | .maxlen = sizeof(sysctl_stat_interval), | |
1378 | .mode = 0644, | |
1379 | .proc_handler = proc_dointvec_jiffies, | |
1380 | }, | |
1381 | #endif | |
1382 | #ifdef CONFIG_MMU | |
1383 | { | |
1384 | .procname = "mmap_min_addr", | |
1385 | .data = &dac_mmap_min_addr, | |
1386 | .maxlen = sizeof(unsigned long), | |
1387 | .mode = 0644, | |
1388 | .proc_handler = mmap_min_addr_handler, | |
1389 | }, | |
1390 | #endif | |
1391 | #ifdef CONFIG_NUMA | |
1392 | { | |
1393 | .procname = "numa_zonelist_order", | |
1394 | .data = &numa_zonelist_order, | |
1395 | .maxlen = NUMA_ZONELIST_ORDER_LEN, | |
1396 | .mode = 0644, | |
1397 | .proc_handler = numa_zonelist_order_handler, | |
1398 | }, | |
1399 | #endif | |
1400 | #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \ | |
1401 | (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL)) | |
1402 | { | |
1403 | .procname = "vdso_enabled", | |
1404 | .data = &vdso_enabled, | |
1405 | .maxlen = sizeof(vdso_enabled), | |
1406 | .mode = 0644, | |
1407 | .proc_handler = proc_dointvec, | |
1408 | .extra1 = &zero, | |
1409 | }, | |
1410 | #endif | |
1411 | #ifdef CONFIG_HIGHMEM | |
1412 | { | |
1413 | .procname = "highmem_is_dirtyable", | |
1414 | .data = &vm_highmem_is_dirtyable, | |
1415 | .maxlen = sizeof(vm_highmem_is_dirtyable), | |
1416 | .mode = 0644, | |
1417 | .proc_handler = proc_dointvec_minmax, | |
1418 | .extra1 = &zero, | |
1419 | .extra2 = &one, | |
1420 | }, | |
1421 | #endif | |
1422 | { | |
1423 | .procname = "scan_unevictable_pages", | |
1424 | .data = &scan_unevictable_pages, | |
1425 | .maxlen = sizeof(scan_unevictable_pages), | |
1426 | .mode = 0644, | |
1427 | .proc_handler = scan_unevictable_handler, | |
1428 | }, | |
1429 | #ifdef CONFIG_MEMORY_FAILURE | |
1430 | { | |
1431 | .procname = "memory_failure_early_kill", | |
1432 | .data = &sysctl_memory_failure_early_kill, | |
1433 | .maxlen = sizeof(sysctl_memory_failure_early_kill), | |
1434 | .mode = 0644, | |
1435 | .proc_handler = proc_dointvec_minmax, | |
1436 | .extra1 = &zero, | |
1437 | .extra2 = &one, | |
1438 | }, | |
1439 | { | |
1440 | .procname = "memory_failure_recovery", | |
1441 | .data = &sysctl_memory_failure_recovery, | |
1442 | .maxlen = sizeof(sysctl_memory_failure_recovery), | |
1443 | .mode = 0644, | |
1444 | .proc_handler = proc_dointvec_minmax, | |
1445 | .extra1 = &zero, | |
1446 | .extra2 = &one, | |
1447 | }, | |
1448 | #endif | |
1449 | { | |
1450 | .procname = "user_reserve_kbytes", | |
1451 | .data = &sysctl_user_reserve_kbytes, | |
1452 | .maxlen = sizeof(sysctl_user_reserve_kbytes), | |
1453 | .mode = 0644, | |
1454 | .proc_handler = proc_doulongvec_minmax, | |
1455 | }, | |
1456 | { | |
1457 | .procname = "admin_reserve_kbytes", | |
1458 | .data = &sysctl_admin_reserve_kbytes, | |
1459 | .maxlen = sizeof(sysctl_admin_reserve_kbytes), | |
1460 | .mode = 0644, | |
1461 | .proc_handler = proc_doulongvec_minmax, | |
1462 | }, | |
1463 | { } | |
1464 | }; | |
1465 | ||
1466 | #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) | |
1467 | static struct ctl_table binfmt_misc_table[] = { | |
1468 | { } | |
1469 | }; | |
1470 | #endif | |
1471 | ||
1472 | static struct ctl_table fs_table[] = { | |
1473 | { | |
1474 | .procname = "inode-nr", | |
1475 | .data = &inodes_stat, | |
1476 | .maxlen = 2*sizeof(long), | |
1477 | .mode = 0444, | |
1478 | .proc_handler = proc_nr_inodes, | |
1479 | }, | |
1480 | { | |
1481 | .procname = "inode-state", | |
1482 | .data = &inodes_stat, | |
1483 | .maxlen = 7*sizeof(long), | |
1484 | .mode = 0444, | |
1485 | .proc_handler = proc_nr_inodes, | |
1486 | }, | |
1487 | { | |
1488 | .procname = "file-nr", | |
1489 | .data = &files_stat, | |
1490 | .maxlen = sizeof(files_stat), | |
1491 | .mode = 0444, | |
1492 | .proc_handler = proc_nr_files, | |
1493 | }, | |
1494 | { | |
1495 | .procname = "file-max", | |
1496 | .data = &files_stat.max_files, | |
1497 | .maxlen = sizeof(files_stat.max_files), | |
1498 | .mode = 0644, | |
1499 | .proc_handler = proc_doulongvec_minmax, | |
1500 | }, | |
1501 | { | |
1502 | .procname = "nr_open", | |
1503 | .data = &sysctl_nr_open, | |
1504 | .maxlen = sizeof(int), | |
1505 | .mode = 0644, | |
1506 | .proc_handler = proc_dointvec_minmax, | |
1507 | .extra1 = &sysctl_nr_open_min, | |
1508 | .extra2 = &sysctl_nr_open_max, | |
1509 | }, | |
1510 | { | |
1511 | .procname = "dentry-state", | |
1512 | .data = &dentry_stat, | |
1513 | .maxlen = 6*sizeof(long), | |
1514 | .mode = 0444, | |
1515 | .proc_handler = proc_nr_dentry, | |
1516 | }, | |
1517 | { | |
1518 | .procname = "overflowuid", | |
1519 | .data = &fs_overflowuid, | |
1520 | .maxlen = sizeof(int), | |
1521 | .mode = 0644, | |
1522 | .proc_handler = proc_dointvec_minmax, | |
1523 | .extra1 = &minolduid, | |
1524 | .extra2 = &maxolduid, | |
1525 | }, | |
1526 | { | |
1527 | .procname = "overflowgid", | |
1528 | .data = &fs_overflowgid, | |
1529 | .maxlen = sizeof(int), | |
1530 | .mode = 0644, | |
1531 | .proc_handler = proc_dointvec_minmax, | |
1532 | .extra1 = &minolduid, | |
1533 | .extra2 = &maxolduid, | |
1534 | }, | |
1535 | #ifdef CONFIG_FILE_LOCKING | |
1536 | { | |
1537 | .procname = "leases-enable", | |
1538 | .data = &leases_enable, | |
1539 | .maxlen = sizeof(int), | |
1540 | .mode = 0644, | |
1541 | .proc_handler = proc_dointvec, | |
1542 | }, | |
1543 | #endif | |
1544 | #ifdef CONFIG_DNOTIFY | |
1545 | { | |
1546 | .procname = "dir-notify-enable", | |
1547 | .data = &dir_notify_enable, | |
1548 | .maxlen = sizeof(int), | |
1549 | .mode = 0644, | |
1550 | .proc_handler = proc_dointvec, | |
1551 | }, | |
1552 | #endif | |
1553 | #ifdef CONFIG_MMU | |
1554 | #ifdef CONFIG_FILE_LOCKING | |
1555 | { | |
1556 | .procname = "lease-break-time", | |
1557 | .data = &lease_break_time, | |
1558 | .maxlen = sizeof(int), | |
1559 | .mode = 0644, | |
1560 | .proc_handler = proc_dointvec, | |
1561 | }, | |
1562 | #endif | |
1563 | #ifdef CONFIG_AIO | |
1564 | { | |
1565 | .procname = "aio-nr", | |
1566 | .data = &aio_nr, | |
1567 | .maxlen = sizeof(aio_nr), | |
1568 | .mode = 0444, | |
1569 | .proc_handler = proc_doulongvec_minmax, | |
1570 | }, | |
1571 | { | |
1572 | .procname = "aio-max-nr", | |
1573 | .data = &aio_max_nr, | |
1574 | .maxlen = sizeof(aio_max_nr), | |
1575 | .mode = 0644, | |
1576 | .proc_handler = proc_doulongvec_minmax, | |
1577 | }, | |
1578 | #endif /* CONFIG_AIO */ | |
1579 | #ifdef CONFIG_INOTIFY_USER | |
1580 | { | |
1581 | .procname = "inotify", | |
1582 | .mode = 0555, | |
1583 | .child = inotify_table, | |
1584 | }, | |
1585 | #endif | |
1586 | #ifdef CONFIG_EPOLL | |
1587 | { | |
1588 | .procname = "epoll", | |
1589 | .mode = 0555, | |
1590 | .child = epoll_table, | |
1591 | }, | |
1592 | #endif | |
1593 | #endif | |
1594 | { | |
1595 | .procname = "protected_symlinks", | |
1596 | .data = &sysctl_protected_symlinks, | |
1597 | .maxlen = sizeof(int), | |
1598 | .mode = 0600, | |
1599 | .proc_handler = proc_dointvec_minmax, | |
1600 | .extra1 = &zero, | |
1601 | .extra2 = &one, | |
1602 | }, | |
1603 | { | |
1604 | .procname = "protected_hardlinks", | |
1605 | .data = &sysctl_protected_hardlinks, | |
1606 | .maxlen = sizeof(int), | |
1607 | .mode = 0600, | |
1608 | .proc_handler = proc_dointvec_minmax, | |
1609 | .extra1 = &zero, | |
1610 | .extra2 = &one, | |
1611 | }, | |
1612 | { | |
1613 | .procname = "suid_dumpable", | |
1614 | .data = &suid_dumpable, | |
1615 | .maxlen = sizeof(int), | |
1616 | .mode = 0644, | |
1617 | .proc_handler = proc_dointvec_minmax_coredump, | |
1618 | .extra1 = &zero, | |
1619 | .extra2 = &two, | |
1620 | }, | |
1621 | #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) | |
1622 | { | |
1623 | .procname = "binfmt_misc", | |
1624 | .mode = 0555, | |
1625 | .child = binfmt_misc_table, | |
1626 | }, | |
1627 | #endif | |
1628 | { | |
1629 | .procname = "pipe-max-size", | |
1630 | .data = &pipe_max_size, | |
1631 | .maxlen = sizeof(int), | |
1632 | .mode = 0644, | |
1633 | .proc_handler = &pipe_proc_fn, | |
1634 | .extra1 = &pipe_min_size, | |
1635 | }, | |
1636 | { } | |
1637 | }; | |
1638 | ||
1639 | static struct ctl_table debug_table[] = { | |
1640 | #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE | |
1641 | { | |
1642 | .procname = "exception-trace", | |
1643 | .data = &show_unhandled_signals, | |
1644 | .maxlen = sizeof(int), | |
1645 | .mode = 0644, | |
1646 | .proc_handler = proc_dointvec | |
1647 | }, | |
1648 | #endif | |
1649 | #if defined(CONFIG_OPTPROBES) | |
1650 | { | |
1651 | .procname = "kprobes-optimization", | |
1652 | .data = &sysctl_kprobes_optimization, | |
1653 | .maxlen = sizeof(int), | |
1654 | .mode = 0644, | |
1655 | .proc_handler = proc_kprobes_optimization_handler, | |
1656 | .extra1 = &zero, | |
1657 | .extra2 = &one, | |
1658 | }, | |
1659 | #endif | |
1660 | { } | |
1661 | }; | |
1662 | ||
1663 | static struct ctl_table dev_table[] = { | |
1664 | { } | |
1665 | }; | |
1666 | ||
1667 | int __init sysctl_init(void) | |
1668 | { | |
1669 | struct ctl_table_header *hdr; | |
1670 | ||
1671 | hdr = register_sysctl_table(sysctl_base_table); | |
1672 | kmemleak_not_leak(hdr); | |
1673 | return 0; | |
1674 | } | |
1675 | ||
1676 | #endif /* CONFIG_SYSCTL */ | |
1677 | ||
1678 | /* | |
1679 | * /proc/sys support | |
1680 | */ | |
1681 | ||
1682 | #ifdef CONFIG_PROC_SYSCTL | |
1683 | ||
1684 | static int _proc_do_string(void* data, int maxlen, int write, | |
1685 | void __user *buffer, | |
1686 | size_t *lenp, loff_t *ppos) | |
1687 | { | |
1688 | size_t len; | |
1689 | char __user *p; | |
1690 | char c; | |
1691 | ||
1692 | if (!data || !maxlen || !*lenp) { | |
1693 | *lenp = 0; | |
1694 | return 0; | |
1695 | } | |
1696 | ||
1697 | if (write) { | |
1698 | len = 0; | |
1699 | p = buffer; | |
1700 | while (len < *lenp) { | |
1701 | if (get_user(c, p++)) | |
1702 | return -EFAULT; | |
1703 | if (c == 0 || c == '\n') | |
1704 | break; | |
1705 | len++; | |
1706 | } | |
1707 | if (len >= maxlen) | |
1708 | len = maxlen-1; | |
1709 | if(copy_from_user(data, buffer, len)) | |
1710 | return -EFAULT; | |
1711 | ((char *) data)[len] = 0; | |
1712 | *ppos += *lenp; | |
1713 | } else { | |
1714 | len = strlen(data); | |
1715 | if (len > maxlen) | |
1716 | len = maxlen; | |
1717 | ||
1718 | if (*ppos > len) { | |
1719 | *lenp = 0; | |
1720 | return 0; | |
1721 | } | |
1722 | ||
1723 | data += *ppos; | |
1724 | len -= *ppos; | |
1725 | ||
1726 | if (len > *lenp) | |
1727 | len = *lenp; | |
1728 | if (len) | |
1729 | if(copy_to_user(buffer, data, len)) | |
1730 | return -EFAULT; | |
1731 | if (len < *lenp) { | |
1732 | if(put_user('\n', ((char __user *) buffer) + len)) | |
1733 | return -EFAULT; | |
1734 | len++; | |
1735 | } | |
1736 | *lenp = len; | |
1737 | *ppos += len; | |
1738 | } | |
1739 | return 0; | |
1740 | } | |
1741 | ||
1742 | /** | |
1743 | * proc_dostring - read a string sysctl | |
1744 | * @table: the sysctl table | |
1745 | * @write: %TRUE if this is a write to the sysctl file | |
1746 | * @buffer: the user buffer | |
1747 | * @lenp: the size of the user buffer | |
1748 | * @ppos: file position | |
1749 | * | |
1750 | * Reads/writes a string from/to the user buffer. If the kernel | |
1751 | * buffer provided is not large enough to hold the string, the | |
1752 | * string is truncated. The copied string is %NULL-terminated. | |
1753 | * If the string is being read by the user process, it is copied | |
1754 | * and a newline '\n' is added. It is truncated if the buffer is | |
1755 | * not large enough. | |
1756 | * | |
1757 | * Returns 0 on success. | |
1758 | */ | |
1759 | int proc_dostring(struct ctl_table *table, int write, | |
1760 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
1761 | { | |
1762 | return _proc_do_string(table->data, table->maxlen, write, | |
1763 | buffer, lenp, ppos); | |
1764 | } | |
1765 | ||
1766 | static size_t proc_skip_spaces(char **buf) | |
1767 | { | |
1768 | size_t ret; | |
1769 | char *tmp = skip_spaces(*buf); | |
1770 | ret = tmp - *buf; | |
1771 | *buf = tmp; | |
1772 | return ret; | |
1773 | } | |
1774 | ||
1775 | static void proc_skip_char(char **buf, size_t *size, const char v) | |
1776 | { | |
1777 | while (*size) { | |
1778 | if (**buf != v) | |
1779 | break; | |
1780 | (*size)--; | |
1781 | (*buf)++; | |
1782 | } | |
1783 | } | |
1784 | ||
1785 | #define TMPBUFLEN 22 | |
1786 | /** | |
1787 | * proc_get_long - reads an ASCII formatted integer from a user buffer | |
1788 | * | |
1789 | * @buf: a kernel buffer | |
1790 | * @size: size of the kernel buffer | |
1791 | * @val: this is where the number will be stored | |
1792 | * @neg: set to %TRUE if number is negative | |
1793 | * @perm_tr: a vector which contains the allowed trailers | |
1794 | * @perm_tr_len: size of the perm_tr vector | |
1795 | * @tr: pointer to store the trailer character | |
1796 | * | |
1797 | * In case of success %0 is returned and @buf and @size are updated with | |
1798 | * the amount of bytes read. If @tr is non-NULL and a trailing | |
1799 | * character exists (size is non-zero after returning from this | |
1800 | * function), @tr is updated with the trailing character. | |
1801 | */ | |
1802 | static int proc_get_long(char **buf, size_t *size, | |
1803 | unsigned long *val, bool *neg, | |
1804 | const char *perm_tr, unsigned perm_tr_len, char *tr) | |
1805 | { | |
1806 | int len; | |
1807 | char *p, tmp[TMPBUFLEN]; | |
1808 | ||
1809 | if (!*size) | |
1810 | return -EINVAL; | |
1811 | ||
1812 | len = *size; | |
1813 | if (len > TMPBUFLEN - 1) | |
1814 | len = TMPBUFLEN - 1; | |
1815 | ||
1816 | memcpy(tmp, *buf, len); | |
1817 | ||
1818 | tmp[len] = 0; | |
1819 | p = tmp; | |
1820 | if (*p == '-' && *size > 1) { | |
1821 | *neg = true; | |
1822 | p++; | |
1823 | } else | |
1824 | *neg = false; | |
1825 | if (!isdigit(*p)) | |
1826 | return -EINVAL; | |
1827 | ||
1828 | *val = simple_strtoul(p, &p, 0); | |
1829 | ||
1830 | len = p - tmp; | |
1831 | ||
1832 | /* We don't know if the next char is whitespace thus we may accept | |
1833 | * invalid integers (e.g. 1234...a) or two integers instead of one | |
1834 | * (e.g. 123...1). So lets not allow such large numbers. */ | |
1835 | if (len == TMPBUFLEN - 1) | |
1836 | return -EINVAL; | |
1837 | ||
1838 | if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len)) | |
1839 | return -EINVAL; | |
1840 | ||
1841 | if (tr && (len < *size)) | |
1842 | *tr = *p; | |
1843 | ||
1844 | *buf += len; | |
1845 | *size -= len; | |
1846 | ||
1847 | return 0; | |
1848 | } | |
1849 | ||
1850 | /** | |
1851 | * proc_put_long - converts an integer to a decimal ASCII formatted string | |
1852 | * | |
1853 | * @buf: the user buffer | |
1854 | * @size: the size of the user buffer | |
1855 | * @val: the integer to be converted | |
1856 | * @neg: sign of the number, %TRUE for negative | |
1857 | * | |
1858 | * In case of success %0 is returned and @buf and @size are updated with | |
1859 | * the amount of bytes written. | |
1860 | */ | |
1861 | static int proc_put_long(void __user **buf, size_t *size, unsigned long val, | |
1862 | bool neg) | |
1863 | { | |
1864 | int len; | |
1865 | char tmp[TMPBUFLEN], *p = tmp; | |
1866 | ||
1867 | sprintf(p, "%s%lu", neg ? "-" : "", val); | |
1868 | len = strlen(tmp); | |
1869 | if (len > *size) | |
1870 | len = *size; | |
1871 | if (copy_to_user(*buf, tmp, len)) | |
1872 | return -EFAULT; | |
1873 | *size -= len; | |
1874 | *buf += len; | |
1875 | return 0; | |
1876 | } | |
1877 | #undef TMPBUFLEN | |
1878 | ||
1879 | static int proc_put_char(void __user **buf, size_t *size, char c) | |
1880 | { | |
1881 | if (*size) { | |
1882 | char __user **buffer = (char __user **)buf; | |
1883 | if (put_user(c, *buffer)) | |
1884 | return -EFAULT; | |
1885 | (*size)--, (*buffer)++; | |
1886 | *buf = *buffer; | |
1887 | } | |
1888 | return 0; | |
1889 | } | |
1890 | ||
1891 | static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp, | |
1892 | int *valp, | |
1893 | int write, void *data) | |
1894 | { | |
1895 | if (write) { | |
1896 | *valp = *negp ? -*lvalp : *lvalp; | |
1897 | } else { | |
1898 | int val = *valp; | |
1899 | if (val < 0) { | |
1900 | *negp = true; | |
1901 | *lvalp = (unsigned long)-val; | |
1902 | } else { | |
1903 | *negp = false; | |
1904 | *lvalp = (unsigned long)val; | |
1905 | } | |
1906 | } | |
1907 | return 0; | |
1908 | } | |
1909 | ||
1910 | static const char proc_wspace_sep[] = { ' ', '\t', '\n' }; | |
1911 | ||
1912 | static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table, | |
1913 | int write, void __user *buffer, | |
1914 | size_t *lenp, loff_t *ppos, | |
1915 | int (*conv)(bool *negp, unsigned long *lvalp, int *valp, | |
1916 | int write, void *data), | |
1917 | void *data) | |
1918 | { | |
1919 | int *i, vleft, first = 1, err = 0; | |
1920 | unsigned long page = 0; | |
1921 | size_t left; | |
1922 | char *kbuf; | |
1923 | ||
1924 | if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) { | |
1925 | *lenp = 0; | |
1926 | return 0; | |
1927 | } | |
1928 | ||
1929 | i = (int *) tbl_data; | |
1930 | vleft = table->maxlen / sizeof(*i); | |
1931 | left = *lenp; | |
1932 | ||
1933 | if (!conv) | |
1934 | conv = do_proc_dointvec_conv; | |
1935 | ||
1936 | if (write) { | |
1937 | if (left > PAGE_SIZE - 1) | |
1938 | left = PAGE_SIZE - 1; | |
1939 | page = __get_free_page(GFP_TEMPORARY); | |
1940 | kbuf = (char *) page; | |
1941 | if (!kbuf) | |
1942 | return -ENOMEM; | |
1943 | if (copy_from_user(kbuf, buffer, left)) { | |
1944 | err = -EFAULT; | |
1945 | goto free; | |
1946 | } | |
1947 | kbuf[left] = 0; | |
1948 | } | |
1949 | ||
1950 | for (; left && vleft--; i++, first=0) { | |
1951 | unsigned long lval; | |
1952 | bool neg; | |
1953 | ||
1954 | if (write) { | |
1955 | left -= proc_skip_spaces(&kbuf); | |
1956 | ||
1957 | if (!left) | |
1958 | break; | |
1959 | err = proc_get_long(&kbuf, &left, &lval, &neg, | |
1960 | proc_wspace_sep, | |
1961 | sizeof(proc_wspace_sep), NULL); | |
1962 | if (err) | |
1963 | break; | |
1964 | if (conv(&neg, &lval, i, 1, data)) { | |
1965 | err = -EINVAL; | |
1966 | break; | |
1967 | } | |
1968 | } else { | |
1969 | if (conv(&neg, &lval, i, 0, data)) { | |
1970 | err = -EINVAL; | |
1971 | break; | |
1972 | } | |
1973 | if (!first) | |
1974 | err = proc_put_char(&buffer, &left, '\t'); | |
1975 | if (err) | |
1976 | break; | |
1977 | err = proc_put_long(&buffer, &left, lval, neg); | |
1978 | if (err) | |
1979 | break; | |
1980 | } | |
1981 | } | |
1982 | ||
1983 | if (!write && !first && left && !err) | |
1984 | err = proc_put_char(&buffer, &left, '\n'); | |
1985 | if (write && !err && left) | |
1986 | left -= proc_skip_spaces(&kbuf); | |
1987 | free: | |
1988 | if (write) { | |
1989 | free_page(page); | |
1990 | if (first) | |
1991 | return err ? : -EINVAL; | |
1992 | } | |
1993 | *lenp -= left; | |
1994 | *ppos += *lenp; | |
1995 | return err; | |
1996 | } | |
1997 | ||
1998 | static int do_proc_dointvec(struct ctl_table *table, int write, | |
1999 | void __user *buffer, size_t *lenp, loff_t *ppos, | |
2000 | int (*conv)(bool *negp, unsigned long *lvalp, int *valp, | |
2001 | int write, void *data), | |
2002 | void *data) | |
2003 | { | |
2004 | return __do_proc_dointvec(table->data, table, write, | |
2005 | buffer, lenp, ppos, conv, data); | |
2006 | } | |
2007 | ||
2008 | /** | |
2009 | * proc_dointvec - read a vector of integers | |
2010 | * @table: the sysctl table | |
2011 | * @write: %TRUE if this is a write to the sysctl file | |
2012 | * @buffer: the user buffer | |
2013 | * @lenp: the size of the user buffer | |
2014 | * @ppos: file position | |
2015 | * | |
2016 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer | |
2017 | * values from/to the user buffer, treated as an ASCII string. | |
2018 | * | |
2019 | * Returns 0 on success. | |
2020 | */ | |
2021 | int proc_dointvec(struct ctl_table *table, int write, | |
2022 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2023 | { | |
2024 | return do_proc_dointvec(table,write,buffer,lenp,ppos, | |
2025 | NULL,NULL); | |
2026 | } | |
2027 | ||
2028 | /* | |
2029 | * Taint values can only be increased | |
2030 | * This means we can safely use a temporary. | |
2031 | */ | |
2032 | static int proc_taint(struct ctl_table *table, int write, | |
2033 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2034 | { | |
2035 | struct ctl_table t; | |
2036 | unsigned long tmptaint = get_taint(); | |
2037 | int err; | |
2038 | ||
2039 | if (write && !capable(CAP_SYS_ADMIN)) | |
2040 | return -EPERM; | |
2041 | ||
2042 | t = *table; | |
2043 | t.data = &tmptaint; | |
2044 | err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos); | |
2045 | if (err < 0) | |
2046 | return err; | |
2047 | ||
2048 | if (write) { | |
2049 | /* | |
2050 | * Poor man's atomic or. Not worth adding a primitive | |
2051 | * to everyone's atomic.h for this | |
2052 | */ | |
2053 | int i; | |
2054 | for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) { | |
2055 | if ((tmptaint >> i) & 1) | |
2056 | add_taint(i, LOCKDEP_STILL_OK); | |
2057 | } | |
2058 | } | |
2059 | ||
2060 | return err; | |
2061 | } | |
2062 | ||
2063 | #ifdef CONFIG_PRINTK | |
2064 | static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write, | |
2065 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2066 | { | |
2067 | if (write && !capable(CAP_SYS_ADMIN)) | |
2068 | return -EPERM; | |
2069 | ||
2070 | return proc_dointvec_minmax(table, write, buffer, lenp, ppos); | |
2071 | } | |
2072 | #endif | |
2073 | ||
2074 | struct do_proc_dointvec_minmax_conv_param { | |
2075 | int *min; | |
2076 | int *max; | |
2077 | }; | |
2078 | ||
2079 | static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp, | |
2080 | int *valp, | |
2081 | int write, void *data) | |
2082 | { | |
2083 | struct do_proc_dointvec_minmax_conv_param *param = data; | |
2084 | if (write) { | |
2085 | int val = *negp ? -*lvalp : *lvalp; | |
2086 | if ((param->min && *param->min > val) || | |
2087 | (param->max && *param->max < val)) | |
2088 | return -EINVAL; | |
2089 | *valp = val; | |
2090 | } else { | |
2091 | int val = *valp; | |
2092 | if (val < 0) { | |
2093 | *negp = true; | |
2094 | *lvalp = (unsigned long)-val; | |
2095 | } else { | |
2096 | *negp = false; | |
2097 | *lvalp = (unsigned long)val; | |
2098 | } | |
2099 | } | |
2100 | return 0; | |
2101 | } | |
2102 | ||
2103 | /** | |
2104 | * proc_dointvec_minmax - read a vector of integers with min/max values | |
2105 | * @table: the sysctl table | |
2106 | * @write: %TRUE if this is a write to the sysctl file | |
2107 | * @buffer: the user buffer | |
2108 | * @lenp: the size of the user buffer | |
2109 | * @ppos: file position | |
2110 | * | |
2111 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer | |
2112 | * values from/to the user buffer, treated as an ASCII string. | |
2113 | * | |
2114 | * This routine will ensure the values are within the range specified by | |
2115 | * table->extra1 (min) and table->extra2 (max). | |
2116 | * | |
2117 | * Returns 0 on success. | |
2118 | */ | |
2119 | int proc_dointvec_minmax(struct ctl_table *table, int write, | |
2120 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2121 | { | |
2122 | struct do_proc_dointvec_minmax_conv_param param = { | |
2123 | .min = (int *) table->extra1, | |
2124 | .max = (int *) table->extra2, | |
2125 | }; | |
2126 | return do_proc_dointvec(table, write, buffer, lenp, ppos, | |
2127 | do_proc_dointvec_minmax_conv, ¶m); | |
2128 | } | |
2129 | ||
2130 | static void validate_coredump_safety(void) | |
2131 | { | |
2132 | #ifdef CONFIG_COREDUMP | |
2133 | if (suid_dumpable == SUID_DUMP_ROOT && | |
2134 | core_pattern[0] != '/' && core_pattern[0] != '|') { | |
2135 | printk(KERN_WARNING "Unsafe core_pattern used with "\ | |
2136 | "suid_dumpable=2. Pipe handler or fully qualified "\ | |
2137 | "core dump path required.\n"); | |
2138 | } | |
2139 | #endif | |
2140 | } | |
2141 | ||
2142 | static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write, | |
2143 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2144 | { | |
2145 | int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos); | |
2146 | if (!error) | |
2147 | validate_coredump_safety(); | |
2148 | return error; | |
2149 | } | |
2150 | ||
2151 | #ifdef CONFIG_COREDUMP | |
2152 | static int proc_dostring_coredump(struct ctl_table *table, int write, | |
2153 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2154 | { | |
2155 | int error = proc_dostring(table, write, buffer, lenp, ppos); | |
2156 | if (!error) | |
2157 | validate_coredump_safety(); | |
2158 | return error; | |
2159 | } | |
2160 | #endif | |
2161 | ||
2162 | static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write, | |
2163 | void __user *buffer, | |
2164 | size_t *lenp, loff_t *ppos, | |
2165 | unsigned long convmul, | |
2166 | unsigned long convdiv) | |
2167 | { | |
2168 | unsigned long *i, *min, *max; | |
2169 | int vleft, first = 1, err = 0; | |
2170 | unsigned long page = 0; | |
2171 | size_t left; | |
2172 | char *kbuf; | |
2173 | ||
2174 | if (!data || !table->maxlen || !*lenp || (*ppos && !write)) { | |
2175 | *lenp = 0; | |
2176 | return 0; | |
2177 | } | |
2178 | ||
2179 | i = (unsigned long *) data; | |
2180 | min = (unsigned long *) table->extra1; | |
2181 | max = (unsigned long *) table->extra2; | |
2182 | vleft = table->maxlen / sizeof(unsigned long); | |
2183 | left = *lenp; | |
2184 | ||
2185 | if (write) { | |
2186 | if (left > PAGE_SIZE - 1) | |
2187 | left = PAGE_SIZE - 1; | |
2188 | page = __get_free_page(GFP_TEMPORARY); | |
2189 | kbuf = (char *) page; | |
2190 | if (!kbuf) | |
2191 | return -ENOMEM; | |
2192 | if (copy_from_user(kbuf, buffer, left)) { | |
2193 | err = -EFAULT; | |
2194 | goto free; | |
2195 | } | |
2196 | kbuf[left] = 0; | |
2197 | } | |
2198 | ||
2199 | for (; left && vleft--; i++, first = 0) { | |
2200 | unsigned long val; | |
2201 | ||
2202 | if (write) { | |
2203 | bool neg; | |
2204 | ||
2205 | left -= proc_skip_spaces(&kbuf); | |
2206 | ||
2207 | err = proc_get_long(&kbuf, &left, &val, &neg, | |
2208 | proc_wspace_sep, | |
2209 | sizeof(proc_wspace_sep), NULL); | |
2210 | if (err) | |
2211 | break; | |
2212 | if (neg) | |
2213 | continue; | |
2214 | if ((min && val < *min) || (max && val > *max)) | |
2215 | continue; | |
2216 | *i = val; | |
2217 | } else { | |
2218 | val = convdiv * (*i) / convmul; | |
2219 | if (!first) { | |
2220 | err = proc_put_char(&buffer, &left, '\t'); | |
2221 | if (err) | |
2222 | break; | |
2223 | } | |
2224 | err = proc_put_long(&buffer, &left, val, false); | |
2225 | if (err) | |
2226 | break; | |
2227 | } | |
2228 | } | |
2229 | ||
2230 | if (!write && !first && left && !err) | |
2231 | err = proc_put_char(&buffer, &left, '\n'); | |
2232 | if (write && !err) | |
2233 | left -= proc_skip_spaces(&kbuf); | |
2234 | free: | |
2235 | if (write) { | |
2236 | free_page(page); | |
2237 | if (first) | |
2238 | return err ? : -EINVAL; | |
2239 | } | |
2240 | *lenp -= left; | |
2241 | *ppos += *lenp; | |
2242 | return err; | |
2243 | } | |
2244 | ||
2245 | static int do_proc_doulongvec_minmax(struct ctl_table *table, int write, | |
2246 | void __user *buffer, | |
2247 | size_t *lenp, loff_t *ppos, | |
2248 | unsigned long convmul, | |
2249 | unsigned long convdiv) | |
2250 | { | |
2251 | return __do_proc_doulongvec_minmax(table->data, table, write, | |
2252 | buffer, lenp, ppos, convmul, convdiv); | |
2253 | } | |
2254 | ||
2255 | /** | |
2256 | * proc_doulongvec_minmax - read a vector of long integers with min/max values | |
2257 | * @table: the sysctl table | |
2258 | * @write: %TRUE if this is a write to the sysctl file | |
2259 | * @buffer: the user buffer | |
2260 | * @lenp: the size of the user buffer | |
2261 | * @ppos: file position | |
2262 | * | |
2263 | * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long | |
2264 | * values from/to the user buffer, treated as an ASCII string. | |
2265 | * | |
2266 | * This routine will ensure the values are within the range specified by | |
2267 | * table->extra1 (min) and table->extra2 (max). | |
2268 | * | |
2269 | * Returns 0 on success. | |
2270 | */ | |
2271 | int proc_doulongvec_minmax(struct ctl_table *table, int write, | |
2272 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2273 | { | |
2274 | return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l); | |
2275 | } | |
2276 | ||
2277 | /** | |
2278 | * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values | |
2279 | * @table: the sysctl table | |
2280 | * @write: %TRUE if this is a write to the sysctl file | |
2281 | * @buffer: the user buffer | |
2282 | * @lenp: the size of the user buffer | |
2283 | * @ppos: file position | |
2284 | * | |
2285 | * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long | |
2286 | * values from/to the user buffer, treated as an ASCII string. The values | |
2287 | * are treated as milliseconds, and converted to jiffies when they are stored. | |
2288 | * | |
2289 | * This routine will ensure the values are within the range specified by | |
2290 | * table->extra1 (min) and table->extra2 (max). | |
2291 | * | |
2292 | * Returns 0 on success. | |
2293 | */ | |
2294 | int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, | |
2295 | void __user *buffer, | |
2296 | size_t *lenp, loff_t *ppos) | |
2297 | { | |
2298 | return do_proc_doulongvec_minmax(table, write, buffer, | |
2299 | lenp, ppos, HZ, 1000l); | |
2300 | } | |
2301 | ||
2302 | ||
2303 | static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp, | |
2304 | int *valp, | |
2305 | int write, void *data) | |
2306 | { | |
2307 | if (write) { | |
2308 | if (*lvalp > LONG_MAX / HZ) | |
2309 | return 1; | |
2310 | *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ); | |
2311 | } else { | |
2312 | int val = *valp; | |
2313 | unsigned long lval; | |
2314 | if (val < 0) { | |
2315 | *negp = true; | |
2316 | lval = (unsigned long)-val; | |
2317 | } else { | |
2318 | *negp = false; | |
2319 | lval = (unsigned long)val; | |
2320 | } | |
2321 | *lvalp = lval / HZ; | |
2322 | } | |
2323 | return 0; | |
2324 | } | |
2325 | ||
2326 | static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp, | |
2327 | int *valp, | |
2328 | int write, void *data) | |
2329 | { | |
2330 | if (write) { | |
2331 | if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ) | |
2332 | return 1; | |
2333 | *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp); | |
2334 | } else { | |
2335 | int val = *valp; | |
2336 | unsigned long lval; | |
2337 | if (val < 0) { | |
2338 | *negp = true; | |
2339 | lval = (unsigned long)-val; | |
2340 | } else { | |
2341 | *negp = false; | |
2342 | lval = (unsigned long)val; | |
2343 | } | |
2344 | *lvalp = jiffies_to_clock_t(lval); | |
2345 | } | |
2346 | return 0; | |
2347 | } | |
2348 | ||
2349 | static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp, | |
2350 | int *valp, | |
2351 | int write, void *data) | |
2352 | { | |
2353 | if (write) { | |
2354 | unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp); | |
2355 | ||
2356 | if (jif > INT_MAX) | |
2357 | return 1; | |
2358 | *valp = (int)jif; | |
2359 | } else { | |
2360 | int val = *valp; | |
2361 | unsigned long lval; | |
2362 | if (val < 0) { | |
2363 | *negp = true; | |
2364 | lval = (unsigned long)-val; | |
2365 | } else { | |
2366 | *negp = false; | |
2367 | lval = (unsigned long)val; | |
2368 | } | |
2369 | *lvalp = jiffies_to_msecs(lval); | |
2370 | } | |
2371 | return 0; | |
2372 | } | |
2373 | ||
2374 | /** | |
2375 | * proc_dointvec_jiffies - read a vector of integers as seconds | |
2376 | * @table: the sysctl table | |
2377 | * @write: %TRUE if this is a write to the sysctl file | |
2378 | * @buffer: the user buffer | |
2379 | * @lenp: the size of the user buffer | |
2380 | * @ppos: file position | |
2381 | * | |
2382 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer | |
2383 | * values from/to the user buffer, treated as an ASCII string. | |
2384 | * The values read are assumed to be in seconds, and are converted into | |
2385 | * jiffies. | |
2386 | * | |
2387 | * Returns 0 on success. | |
2388 | */ | |
2389 | int proc_dointvec_jiffies(struct ctl_table *table, int write, | |
2390 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2391 | { | |
2392 | return do_proc_dointvec(table,write,buffer,lenp,ppos, | |
2393 | do_proc_dointvec_jiffies_conv,NULL); | |
2394 | } | |
2395 | ||
2396 | /** | |
2397 | * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds | |
2398 | * @table: the sysctl table | |
2399 | * @write: %TRUE if this is a write to the sysctl file | |
2400 | * @buffer: the user buffer | |
2401 | * @lenp: the size of the user buffer | |
2402 | * @ppos: pointer to the file position | |
2403 | * | |
2404 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer | |
2405 | * values from/to the user buffer, treated as an ASCII string. | |
2406 | * The values read are assumed to be in 1/USER_HZ seconds, and | |
2407 | * are converted into jiffies. | |
2408 | * | |
2409 | * Returns 0 on success. | |
2410 | */ | |
2411 | int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, | |
2412 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2413 | { | |
2414 | return do_proc_dointvec(table,write,buffer,lenp,ppos, | |
2415 | do_proc_dointvec_userhz_jiffies_conv,NULL); | |
2416 | } | |
2417 | ||
2418 | /** | |
2419 | * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds | |
2420 | * @table: the sysctl table | |
2421 | * @write: %TRUE if this is a write to the sysctl file | |
2422 | * @buffer: the user buffer | |
2423 | * @lenp: the size of the user buffer | |
2424 | * @ppos: file position | |
2425 | * @ppos: the current position in the file | |
2426 | * | |
2427 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer | |
2428 | * values from/to the user buffer, treated as an ASCII string. | |
2429 | * The values read are assumed to be in 1/1000 seconds, and | |
2430 | * are converted into jiffies. | |
2431 | * | |
2432 | * Returns 0 on success. | |
2433 | */ | |
2434 | int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, | |
2435 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2436 | { | |
2437 | return do_proc_dointvec(table, write, buffer, lenp, ppos, | |
2438 | do_proc_dointvec_ms_jiffies_conv, NULL); | |
2439 | } | |
2440 | ||
2441 | static int proc_do_cad_pid(struct ctl_table *table, int write, | |
2442 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2443 | { | |
2444 | struct pid *new_pid; | |
2445 | pid_t tmp; | |
2446 | int r; | |
2447 | ||
2448 | tmp = pid_vnr(cad_pid); | |
2449 | ||
2450 | r = __do_proc_dointvec(&tmp, table, write, buffer, | |
2451 | lenp, ppos, NULL, NULL); | |
2452 | if (r || !write) | |
2453 | return r; | |
2454 | ||
2455 | new_pid = find_get_pid(tmp); | |
2456 | if (!new_pid) | |
2457 | return -ESRCH; | |
2458 | ||
2459 | put_pid(xchg(&cad_pid, new_pid)); | |
2460 | return 0; | |
2461 | } | |
2462 | ||
2463 | /** | |
2464 | * proc_do_large_bitmap - read/write from/to a large bitmap | |
2465 | * @table: the sysctl table | |
2466 | * @write: %TRUE if this is a write to the sysctl file | |
2467 | * @buffer: the user buffer | |
2468 | * @lenp: the size of the user buffer | |
2469 | * @ppos: file position | |
2470 | * | |
2471 | * The bitmap is stored at table->data and the bitmap length (in bits) | |
2472 | * in table->maxlen. | |
2473 | * | |
2474 | * We use a range comma separated format (e.g. 1,3-4,10-10) so that | |
2475 | * large bitmaps may be represented in a compact manner. Writing into | |
2476 | * the file will clear the bitmap then update it with the given input. | |
2477 | * | |
2478 | * Returns 0 on success. | |
2479 | */ | |
2480 | int proc_do_large_bitmap(struct ctl_table *table, int write, | |
2481 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2482 | { | |
2483 | int err = 0; | |
2484 | bool first = 1; | |
2485 | size_t left = *lenp; | |
2486 | unsigned long bitmap_len = table->maxlen; | |
2487 | unsigned long *bitmap = (unsigned long *) table->data; | |
2488 | unsigned long *tmp_bitmap = NULL; | |
2489 | char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c; | |
2490 | ||
2491 | if (!bitmap_len || !left || (*ppos && !write)) { | |
2492 | *lenp = 0; | |
2493 | return 0; | |
2494 | } | |
2495 | ||
2496 | if (write) { | |
2497 | unsigned long page = 0; | |
2498 | char *kbuf; | |
2499 | ||
2500 | if (left > PAGE_SIZE - 1) | |
2501 | left = PAGE_SIZE - 1; | |
2502 | ||
2503 | page = __get_free_page(GFP_TEMPORARY); | |
2504 | kbuf = (char *) page; | |
2505 | if (!kbuf) | |
2506 | return -ENOMEM; | |
2507 | if (copy_from_user(kbuf, buffer, left)) { | |
2508 | free_page(page); | |
2509 | return -EFAULT; | |
2510 | } | |
2511 | kbuf[left] = 0; | |
2512 | ||
2513 | tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long), | |
2514 | GFP_KERNEL); | |
2515 | if (!tmp_bitmap) { | |
2516 | free_page(page); | |
2517 | return -ENOMEM; | |
2518 | } | |
2519 | proc_skip_char(&kbuf, &left, '\n'); | |
2520 | while (!err && left) { | |
2521 | unsigned long val_a, val_b; | |
2522 | bool neg; | |
2523 | ||
2524 | err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a, | |
2525 | sizeof(tr_a), &c); | |
2526 | if (err) | |
2527 | break; | |
2528 | if (val_a >= bitmap_len || neg) { | |
2529 | err = -EINVAL; | |
2530 | break; | |
2531 | } | |
2532 | ||
2533 | val_b = val_a; | |
2534 | if (left) { | |
2535 | kbuf++; | |
2536 | left--; | |
2537 | } | |
2538 | ||
2539 | if (c == '-') { | |
2540 | err = proc_get_long(&kbuf, &left, &val_b, | |
2541 | &neg, tr_b, sizeof(tr_b), | |
2542 | &c); | |
2543 | if (err) | |
2544 | break; | |
2545 | if (val_b >= bitmap_len || neg || | |
2546 | val_a > val_b) { | |
2547 | err = -EINVAL; | |
2548 | break; | |
2549 | } | |
2550 | if (left) { | |
2551 | kbuf++; | |
2552 | left--; | |
2553 | } | |
2554 | } | |
2555 | ||
2556 | bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1); | |
2557 | first = 0; | |
2558 | proc_skip_char(&kbuf, &left, '\n'); | |
2559 | } | |
2560 | free_page(page); | |
2561 | } else { | |
2562 | unsigned long bit_a, bit_b = 0; | |
2563 | ||
2564 | while (left) { | |
2565 | bit_a = find_next_bit(bitmap, bitmap_len, bit_b); | |
2566 | if (bit_a >= bitmap_len) | |
2567 | break; | |
2568 | bit_b = find_next_zero_bit(bitmap, bitmap_len, | |
2569 | bit_a + 1) - 1; | |
2570 | ||
2571 | if (!first) { | |
2572 | err = proc_put_char(&buffer, &left, ','); | |
2573 | if (err) | |
2574 | break; | |
2575 | } | |
2576 | err = proc_put_long(&buffer, &left, bit_a, false); | |
2577 | if (err) | |
2578 | break; | |
2579 | if (bit_a != bit_b) { | |
2580 | err = proc_put_char(&buffer, &left, '-'); | |
2581 | if (err) | |
2582 | break; | |
2583 | err = proc_put_long(&buffer, &left, bit_b, false); | |
2584 | if (err) | |
2585 | break; | |
2586 | } | |
2587 | ||
2588 | first = 0; bit_b++; | |
2589 | } | |
2590 | if (!err) | |
2591 | err = proc_put_char(&buffer, &left, '\n'); | |
2592 | } | |
2593 | ||
2594 | if (!err) { | |
2595 | if (write) { | |
2596 | if (*ppos) | |
2597 | bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len); | |
2598 | else | |
2599 | bitmap_copy(bitmap, tmp_bitmap, bitmap_len); | |
2600 | } | |
2601 | kfree(tmp_bitmap); | |
2602 | *lenp -= left; | |
2603 | *ppos += *lenp; | |
2604 | return 0; | |
2605 | } else { | |
2606 | kfree(tmp_bitmap); | |
2607 | return err; | |
2608 | } | |
2609 | } | |
2610 | ||
2611 | #else /* CONFIG_PROC_SYSCTL */ | |
2612 | ||
2613 | int proc_dostring(struct ctl_table *table, int write, | |
2614 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2615 | { | |
2616 | return -ENOSYS; | |
2617 | } | |
2618 | ||
2619 | int proc_dointvec(struct ctl_table *table, int write, | |
2620 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2621 | { | |
2622 | return -ENOSYS; | |
2623 | } | |
2624 | ||
2625 | int proc_dointvec_minmax(struct ctl_table *table, int write, | |
2626 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2627 | { | |
2628 | return -ENOSYS; | |
2629 | } | |
2630 | ||
2631 | int proc_dointvec_jiffies(struct ctl_table *table, int write, | |
2632 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2633 | { | |
2634 | return -ENOSYS; | |
2635 | } | |
2636 | ||
2637 | int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, | |
2638 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2639 | { | |
2640 | return -ENOSYS; | |
2641 | } | |
2642 | ||
2643 | int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, | |
2644 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2645 | { | |
2646 | return -ENOSYS; | |
2647 | } | |
2648 | ||
2649 | int proc_doulongvec_minmax(struct ctl_table *table, int write, | |
2650 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2651 | { | |
2652 | return -ENOSYS; | |
2653 | } | |
2654 | ||
2655 | int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, | |
2656 | void __user *buffer, | |
2657 | size_t *lenp, loff_t *ppos) | |
2658 | { | |
2659 | return -ENOSYS; | |
2660 | } | |
2661 | ||
2662 | ||
2663 | #endif /* CONFIG_PROC_SYSCTL */ | |
2664 | ||
2665 | /* | |
2666 | * No sense putting this after each symbol definition, twice, | |
2667 | * exception granted :-) | |
2668 | */ | |
2669 | EXPORT_SYMBOL(proc_dointvec); | |
2670 | EXPORT_SYMBOL(proc_dointvec_jiffies); | |
2671 | EXPORT_SYMBOL(proc_dointvec_minmax); | |
2672 | EXPORT_SYMBOL(proc_dointvec_userhz_jiffies); | |
2673 | EXPORT_SYMBOL(proc_dointvec_ms_jiffies); | |
2674 | EXPORT_SYMBOL(proc_dostring); | |
2675 | EXPORT_SYMBOL(proc_doulongvec_minmax); | |
2676 | EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax); |