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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 | #include <linux/kexec.h> | |
66 | ||
67 | #include <asm/uaccess.h> | |
68 | #include <asm/processor.h> | |
69 | ||
70 | #ifdef CONFIG_X86 | |
71 | #include <asm/nmi.h> | |
72 | #include <asm/stacktrace.h> | |
73 | #include <asm/io.h> | |
74 | #endif | |
75 | #ifdef CONFIG_SPARC | |
76 | #include <asm/setup.h> | |
77 | #endif | |
78 | #ifdef CONFIG_BSD_PROCESS_ACCT | |
79 | #include <linux/acct.h> | |
80 | #endif | |
81 | #ifdef CONFIG_RT_MUTEXES | |
82 | #include <linux/rtmutex.h> | |
83 | #endif | |
84 | #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT) | |
85 | #include <linux/lockdep.h> | |
86 | #endif | |
87 | #ifdef CONFIG_CHR_DEV_SG | |
88 | #include <scsi/sg.h> | |
89 | #endif | |
90 | ||
91 | #ifdef CONFIG_LOCKUP_DETECTOR | |
92 | #include <linux/nmi.h> | |
93 | #endif | |
94 | ||
95 | ||
96 | #if defined(CONFIG_SYSCTL) | |
97 | ||
98 | /* External variables not in a header file. */ | |
99 | extern int max_threads; | |
100 | extern int suid_dumpable; | |
101 | #ifdef CONFIG_COREDUMP | |
102 | extern int core_uses_pid; | |
103 | extern char core_pattern[]; | |
104 | extern unsigned int core_pipe_limit; | |
105 | #endif | |
106 | extern int pid_max; | |
107 | extern int pid_max_min, pid_max_max; | |
108 | extern int percpu_pagelist_fraction; | |
109 | extern int compat_log; | |
110 | extern int latencytop_enabled; | |
111 | extern int sysctl_nr_open_min, sysctl_nr_open_max; | |
112 | #ifndef CONFIG_MMU | |
113 | extern int sysctl_nr_trim_pages; | |
114 | #endif | |
115 | ||
116 | /* Constants used for minimum and maximum */ | |
117 | #ifdef CONFIG_LOCKUP_DETECTOR | |
118 | static int sixty = 60; | |
119 | #endif | |
120 | ||
121 | static int __maybe_unused neg_one = -1; | |
122 | ||
123 | static int zero; | |
124 | static int __maybe_unused one = 1; | |
125 | static int __maybe_unused two = 2; | |
126 | static int __maybe_unused four = 4; | |
127 | static unsigned long one_ul = 1; | |
128 | static int one_hundred = 100; | |
129 | #ifdef CONFIG_PRINTK | |
130 | static int ten_thousand = 10000; | |
131 | #endif | |
132 | ||
133 | /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */ | |
134 | static unsigned long dirty_bytes_min = 2 * PAGE_SIZE; | |
135 | ||
136 | /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */ | |
137 | static int maxolduid = 65535; | |
138 | static int minolduid; | |
139 | ||
140 | static int ngroups_max = NGROUPS_MAX; | |
141 | static const int cap_last_cap = CAP_LAST_CAP; | |
142 | ||
143 | /*this is needed for proc_doulongvec_minmax of sysctl_hung_task_timeout_secs */ | |
144 | #ifdef CONFIG_DETECT_HUNG_TASK | |
145 | static unsigned long hung_task_timeout_max = (LONG_MAX/HZ); | |
146 | #endif | |
147 | ||
148 | #ifdef CONFIG_INOTIFY_USER | |
149 | #include <linux/inotify.h> | |
150 | #endif | |
151 | #ifdef CONFIG_SPARC | |
152 | #endif | |
153 | ||
154 | #ifdef __hppa__ | |
155 | extern int pwrsw_enabled; | |
156 | #endif | |
157 | ||
158 | #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW | |
159 | extern int unaligned_enabled; | |
160 | #endif | |
161 | ||
162 | #ifdef CONFIG_IA64 | |
163 | extern int unaligned_dump_stack; | |
164 | #endif | |
165 | ||
166 | #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN | |
167 | extern int no_unaligned_warning; | |
168 | #endif | |
169 | ||
170 | #ifdef CONFIG_PROC_SYSCTL | |
171 | ||
172 | #define SYSCTL_WRITES_LEGACY -1 | |
173 | #define SYSCTL_WRITES_WARN 0 | |
174 | #define SYSCTL_WRITES_STRICT 1 | |
175 | ||
176 | static int sysctl_writes_strict = SYSCTL_WRITES_WARN; | |
177 | ||
178 | static int proc_do_cad_pid(struct ctl_table *table, int write, | |
179 | void __user *buffer, size_t *lenp, loff_t *ppos); | |
180 | static int proc_taint(struct ctl_table *table, int write, | |
181 | void __user *buffer, size_t *lenp, loff_t *ppos); | |
182 | #endif | |
183 | ||
184 | #ifdef CONFIG_PRINTK | |
185 | static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write, | |
186 | void __user *buffer, size_t *lenp, loff_t *ppos); | |
187 | #endif | |
188 | ||
189 | static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write, | |
190 | void __user *buffer, size_t *lenp, loff_t *ppos); | |
191 | #ifdef CONFIG_COREDUMP | |
192 | static int proc_dostring_coredump(struct ctl_table *table, int write, | |
193 | void __user *buffer, size_t *lenp, loff_t *ppos); | |
194 | #endif | |
195 | ||
196 | #ifdef CONFIG_MAGIC_SYSRQ | |
197 | /* Note: sysrq code uses it's own private copy */ | |
198 | static int __sysrq_enabled = CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE; | |
199 | ||
200 | static int sysrq_sysctl_handler(struct ctl_table *table, int write, | |
201 | void __user *buffer, size_t *lenp, | |
202 | loff_t *ppos) | |
203 | { | |
204 | int error; | |
205 | ||
206 | error = proc_dointvec(table, write, buffer, lenp, ppos); | |
207 | if (error) | |
208 | return error; | |
209 | ||
210 | if (write) | |
211 | sysrq_toggle_support(__sysrq_enabled); | |
212 | ||
213 | return 0; | |
214 | } | |
215 | ||
216 | #endif | |
217 | ||
218 | static struct ctl_table kern_table[]; | |
219 | static struct ctl_table vm_table[]; | |
220 | static struct ctl_table fs_table[]; | |
221 | static struct ctl_table debug_table[]; | |
222 | static struct ctl_table dev_table[]; | |
223 | extern struct ctl_table random_table[]; | |
224 | #ifdef CONFIG_EPOLL | |
225 | extern struct ctl_table epoll_table[]; | |
226 | #endif | |
227 | ||
228 | #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT | |
229 | int sysctl_legacy_va_layout; | |
230 | #endif | |
231 | ||
232 | /* The default sysctl tables: */ | |
233 | ||
234 | static struct ctl_table sysctl_base_table[] = { | |
235 | { | |
236 | .procname = "kernel", | |
237 | .mode = 0555, | |
238 | .child = kern_table, | |
239 | }, | |
240 | { | |
241 | .procname = "vm", | |
242 | .mode = 0555, | |
243 | .child = vm_table, | |
244 | }, | |
245 | { | |
246 | .procname = "fs", | |
247 | .mode = 0555, | |
248 | .child = fs_table, | |
249 | }, | |
250 | { | |
251 | .procname = "debug", | |
252 | .mode = 0555, | |
253 | .child = debug_table, | |
254 | }, | |
255 | { | |
256 | .procname = "dev", | |
257 | .mode = 0555, | |
258 | .child = dev_table, | |
259 | }, | |
260 | { } | |
261 | }; | |
262 | ||
263 | #ifdef CONFIG_SCHED_DEBUG | |
264 | static int min_sched_granularity_ns = 100000; /* 100 usecs */ | |
265 | static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */ | |
266 | static int min_wakeup_granularity_ns; /* 0 usecs */ | |
267 | static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */ | |
268 | #ifdef CONFIG_SMP | |
269 | static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE; | |
270 | static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1; | |
271 | #endif /* CONFIG_SMP */ | |
272 | #endif /* CONFIG_SCHED_DEBUG */ | |
273 | ||
274 | #ifdef CONFIG_COMPACTION | |
275 | static int min_extfrag_threshold; | |
276 | static int max_extfrag_threshold = 1000; | |
277 | #endif | |
278 | ||
279 | static struct ctl_table kern_table[] = { | |
280 | { | |
281 | .procname = "sched_child_runs_first", | |
282 | .data = &sysctl_sched_child_runs_first, | |
283 | .maxlen = sizeof(unsigned int), | |
284 | .mode = 0644, | |
285 | .proc_handler = proc_dointvec, | |
286 | }, | |
287 | #ifdef CONFIG_SCHED_DEBUG | |
288 | { | |
289 | .procname = "sched_min_granularity_ns", | |
290 | .data = &sysctl_sched_min_granularity, | |
291 | .maxlen = sizeof(unsigned int), | |
292 | .mode = 0644, | |
293 | .proc_handler = sched_proc_update_handler, | |
294 | .extra1 = &min_sched_granularity_ns, | |
295 | .extra2 = &max_sched_granularity_ns, | |
296 | }, | |
297 | { | |
298 | .procname = "sched_latency_ns", | |
299 | .data = &sysctl_sched_latency, | |
300 | .maxlen = sizeof(unsigned int), | |
301 | .mode = 0644, | |
302 | .proc_handler = sched_proc_update_handler, | |
303 | .extra1 = &min_sched_granularity_ns, | |
304 | .extra2 = &max_sched_granularity_ns, | |
305 | }, | |
306 | { | |
307 | .procname = "sched_wakeup_granularity_ns", | |
308 | .data = &sysctl_sched_wakeup_granularity, | |
309 | .maxlen = sizeof(unsigned int), | |
310 | .mode = 0644, | |
311 | .proc_handler = sched_proc_update_handler, | |
312 | .extra1 = &min_wakeup_granularity_ns, | |
313 | .extra2 = &max_wakeup_granularity_ns, | |
314 | }, | |
315 | #ifdef CONFIG_SMP | |
316 | { | |
317 | .procname = "sched_tunable_scaling", | |
318 | .data = &sysctl_sched_tunable_scaling, | |
319 | .maxlen = sizeof(enum sched_tunable_scaling), | |
320 | .mode = 0644, | |
321 | .proc_handler = sched_proc_update_handler, | |
322 | .extra1 = &min_sched_tunable_scaling, | |
323 | .extra2 = &max_sched_tunable_scaling, | |
324 | }, | |
325 | { | |
326 | .procname = "sched_migration_cost_ns", | |
327 | .data = &sysctl_sched_migration_cost, | |
328 | .maxlen = sizeof(unsigned int), | |
329 | .mode = 0644, | |
330 | .proc_handler = proc_dointvec, | |
331 | }, | |
332 | { | |
333 | .procname = "sched_nr_migrate", | |
334 | .data = &sysctl_sched_nr_migrate, | |
335 | .maxlen = sizeof(unsigned int), | |
336 | .mode = 0644, | |
337 | .proc_handler = proc_dointvec, | |
338 | }, | |
339 | { | |
340 | .procname = "sched_time_avg_ms", | |
341 | .data = &sysctl_sched_time_avg, | |
342 | .maxlen = sizeof(unsigned int), | |
343 | .mode = 0644, | |
344 | .proc_handler = proc_dointvec, | |
345 | }, | |
346 | { | |
347 | .procname = "sched_shares_window_ns", | |
348 | .data = &sysctl_sched_shares_window, | |
349 | .maxlen = sizeof(unsigned int), | |
350 | .mode = 0644, | |
351 | .proc_handler = proc_dointvec, | |
352 | }, | |
353 | { | |
354 | .procname = "timer_migration", | |
355 | .data = &sysctl_timer_migration, | |
356 | .maxlen = sizeof(unsigned int), | |
357 | .mode = 0644, | |
358 | .proc_handler = proc_dointvec_minmax, | |
359 | .extra1 = &zero, | |
360 | .extra2 = &one, | |
361 | }, | |
362 | #endif /* CONFIG_SMP */ | |
363 | #ifdef CONFIG_NUMA_BALANCING | |
364 | { | |
365 | .procname = "numa_balancing_scan_delay_ms", | |
366 | .data = &sysctl_numa_balancing_scan_delay, | |
367 | .maxlen = sizeof(unsigned int), | |
368 | .mode = 0644, | |
369 | .proc_handler = proc_dointvec, | |
370 | }, | |
371 | { | |
372 | .procname = "numa_balancing_scan_period_min_ms", | |
373 | .data = &sysctl_numa_balancing_scan_period_min, | |
374 | .maxlen = sizeof(unsigned int), | |
375 | .mode = 0644, | |
376 | .proc_handler = proc_dointvec, | |
377 | }, | |
378 | { | |
379 | .procname = "numa_balancing_scan_period_max_ms", | |
380 | .data = &sysctl_numa_balancing_scan_period_max, | |
381 | .maxlen = sizeof(unsigned int), | |
382 | .mode = 0644, | |
383 | .proc_handler = proc_dointvec, | |
384 | }, | |
385 | { | |
386 | .procname = "numa_balancing_scan_size_mb", | |
387 | .data = &sysctl_numa_balancing_scan_size, | |
388 | .maxlen = sizeof(unsigned int), | |
389 | .mode = 0644, | |
390 | .proc_handler = proc_dointvec_minmax, | |
391 | .extra1 = &one, | |
392 | }, | |
393 | { | |
394 | .procname = "numa_balancing", | |
395 | .data = NULL, /* filled in by handler */ | |
396 | .maxlen = sizeof(unsigned int), | |
397 | .mode = 0644, | |
398 | .proc_handler = sysctl_numa_balancing, | |
399 | .extra1 = &zero, | |
400 | .extra2 = &one, | |
401 | }, | |
402 | #endif /* CONFIG_NUMA_BALANCING */ | |
403 | #endif /* CONFIG_SCHED_DEBUG */ | |
404 | { | |
405 | .procname = "sched_rt_period_us", | |
406 | .data = &sysctl_sched_rt_period, | |
407 | .maxlen = sizeof(unsigned int), | |
408 | .mode = 0644, | |
409 | .proc_handler = sched_rt_handler, | |
410 | }, | |
411 | { | |
412 | .procname = "sched_rt_runtime_us", | |
413 | .data = &sysctl_sched_rt_runtime, | |
414 | .maxlen = sizeof(int), | |
415 | .mode = 0644, | |
416 | .proc_handler = sched_rt_handler, | |
417 | }, | |
418 | { | |
419 | .procname = "sched_rr_timeslice_ms", | |
420 | .data = &sched_rr_timeslice, | |
421 | .maxlen = sizeof(int), | |
422 | .mode = 0644, | |
423 | .proc_handler = sched_rr_handler, | |
424 | }, | |
425 | #ifdef CONFIG_SCHED_AUTOGROUP | |
426 | { | |
427 | .procname = "sched_autogroup_enabled", | |
428 | .data = &sysctl_sched_autogroup_enabled, | |
429 | .maxlen = sizeof(unsigned int), | |
430 | .mode = 0644, | |
431 | .proc_handler = proc_dointvec_minmax, | |
432 | .extra1 = &zero, | |
433 | .extra2 = &one, | |
434 | }, | |
435 | #endif | |
436 | #ifdef CONFIG_CFS_BANDWIDTH | |
437 | { | |
438 | .procname = "sched_cfs_bandwidth_slice_us", | |
439 | .data = &sysctl_sched_cfs_bandwidth_slice, | |
440 | .maxlen = sizeof(unsigned int), | |
441 | .mode = 0644, | |
442 | .proc_handler = proc_dointvec_minmax, | |
443 | .extra1 = &one, | |
444 | }, | |
445 | #endif | |
446 | #ifdef CONFIG_PROVE_LOCKING | |
447 | { | |
448 | .procname = "prove_locking", | |
449 | .data = &prove_locking, | |
450 | .maxlen = sizeof(int), | |
451 | .mode = 0644, | |
452 | .proc_handler = proc_dointvec, | |
453 | }, | |
454 | #endif | |
455 | #ifdef CONFIG_LOCK_STAT | |
456 | { | |
457 | .procname = "lock_stat", | |
458 | .data = &lock_stat, | |
459 | .maxlen = sizeof(int), | |
460 | .mode = 0644, | |
461 | .proc_handler = proc_dointvec, | |
462 | }, | |
463 | #endif | |
464 | { | |
465 | .procname = "panic", | |
466 | .data = &panic_timeout, | |
467 | .maxlen = sizeof(int), | |
468 | .mode = 0644, | |
469 | .proc_handler = proc_dointvec, | |
470 | }, | |
471 | #ifdef CONFIG_COREDUMP | |
472 | { | |
473 | .procname = "core_uses_pid", | |
474 | .data = &core_uses_pid, | |
475 | .maxlen = sizeof(int), | |
476 | .mode = 0644, | |
477 | .proc_handler = proc_dointvec, | |
478 | }, | |
479 | { | |
480 | .procname = "core_pattern", | |
481 | .data = core_pattern, | |
482 | .maxlen = CORENAME_MAX_SIZE, | |
483 | .mode = 0644, | |
484 | .proc_handler = proc_dostring_coredump, | |
485 | }, | |
486 | { | |
487 | .procname = "core_pipe_limit", | |
488 | .data = &core_pipe_limit, | |
489 | .maxlen = sizeof(unsigned int), | |
490 | .mode = 0644, | |
491 | .proc_handler = proc_dointvec, | |
492 | }, | |
493 | #endif | |
494 | #ifdef CONFIG_PROC_SYSCTL | |
495 | { | |
496 | .procname = "tainted", | |
497 | .maxlen = sizeof(long), | |
498 | .mode = 0644, | |
499 | .proc_handler = proc_taint, | |
500 | }, | |
501 | { | |
502 | .procname = "sysctl_writes_strict", | |
503 | .data = &sysctl_writes_strict, | |
504 | .maxlen = sizeof(int), | |
505 | .mode = 0644, | |
506 | .proc_handler = proc_dointvec_minmax, | |
507 | .extra1 = &neg_one, | |
508 | .extra2 = &one, | |
509 | }, | |
510 | #endif | |
511 | #ifdef CONFIG_LATENCYTOP | |
512 | { | |
513 | .procname = "latencytop", | |
514 | .data = &latencytop_enabled, | |
515 | .maxlen = sizeof(int), | |
516 | .mode = 0644, | |
517 | .proc_handler = proc_dointvec, | |
518 | }, | |
519 | #endif | |
520 | #ifdef CONFIG_BLK_DEV_INITRD | |
521 | { | |
522 | .procname = "real-root-dev", | |
523 | .data = &real_root_dev, | |
524 | .maxlen = sizeof(int), | |
525 | .mode = 0644, | |
526 | .proc_handler = proc_dointvec, | |
527 | }, | |
528 | #endif | |
529 | { | |
530 | .procname = "print-fatal-signals", | |
531 | .data = &print_fatal_signals, | |
532 | .maxlen = sizeof(int), | |
533 | .mode = 0644, | |
534 | .proc_handler = proc_dointvec, | |
535 | }, | |
536 | #ifdef CONFIG_SPARC | |
537 | { | |
538 | .procname = "reboot-cmd", | |
539 | .data = reboot_command, | |
540 | .maxlen = 256, | |
541 | .mode = 0644, | |
542 | .proc_handler = proc_dostring, | |
543 | }, | |
544 | { | |
545 | .procname = "stop-a", | |
546 | .data = &stop_a_enabled, | |
547 | .maxlen = sizeof (int), | |
548 | .mode = 0644, | |
549 | .proc_handler = proc_dointvec, | |
550 | }, | |
551 | { | |
552 | .procname = "scons-poweroff", | |
553 | .data = &scons_pwroff, | |
554 | .maxlen = sizeof (int), | |
555 | .mode = 0644, | |
556 | .proc_handler = proc_dointvec, | |
557 | }, | |
558 | #endif | |
559 | #ifdef CONFIG_SPARC64 | |
560 | { | |
561 | .procname = "tsb-ratio", | |
562 | .data = &sysctl_tsb_ratio, | |
563 | .maxlen = sizeof (int), | |
564 | .mode = 0644, | |
565 | .proc_handler = proc_dointvec, | |
566 | }, | |
567 | #endif | |
568 | #ifdef __hppa__ | |
569 | { | |
570 | .procname = "soft-power", | |
571 | .data = &pwrsw_enabled, | |
572 | .maxlen = sizeof (int), | |
573 | .mode = 0644, | |
574 | .proc_handler = proc_dointvec, | |
575 | }, | |
576 | #endif | |
577 | #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW | |
578 | { | |
579 | .procname = "unaligned-trap", | |
580 | .data = &unaligned_enabled, | |
581 | .maxlen = sizeof (int), | |
582 | .mode = 0644, | |
583 | .proc_handler = proc_dointvec, | |
584 | }, | |
585 | #endif | |
586 | { | |
587 | .procname = "ctrl-alt-del", | |
588 | .data = &C_A_D, | |
589 | .maxlen = sizeof(int), | |
590 | .mode = 0644, | |
591 | .proc_handler = proc_dointvec, | |
592 | }, | |
593 | #ifdef CONFIG_FUNCTION_TRACER | |
594 | { | |
595 | .procname = "ftrace_enabled", | |
596 | .data = &ftrace_enabled, | |
597 | .maxlen = sizeof(int), | |
598 | .mode = 0644, | |
599 | .proc_handler = ftrace_enable_sysctl, | |
600 | }, | |
601 | #endif | |
602 | #ifdef CONFIG_STACK_TRACER | |
603 | { | |
604 | .procname = "stack_tracer_enabled", | |
605 | .data = &stack_tracer_enabled, | |
606 | .maxlen = sizeof(int), | |
607 | .mode = 0644, | |
608 | .proc_handler = stack_trace_sysctl, | |
609 | }, | |
610 | #endif | |
611 | #ifdef CONFIG_TRACING | |
612 | { | |
613 | .procname = "ftrace_dump_on_oops", | |
614 | .data = &ftrace_dump_on_oops, | |
615 | .maxlen = sizeof(int), | |
616 | .mode = 0644, | |
617 | .proc_handler = proc_dointvec, | |
618 | }, | |
619 | { | |
620 | .procname = "traceoff_on_warning", | |
621 | .data = &__disable_trace_on_warning, | |
622 | .maxlen = sizeof(__disable_trace_on_warning), | |
623 | .mode = 0644, | |
624 | .proc_handler = proc_dointvec, | |
625 | }, | |
626 | { | |
627 | .procname = "tracepoint_printk", | |
628 | .data = &tracepoint_printk, | |
629 | .maxlen = sizeof(tracepoint_printk), | |
630 | .mode = 0644, | |
631 | .proc_handler = proc_dointvec, | |
632 | }, | |
633 | #endif | |
634 | #ifdef CONFIG_KEXEC | |
635 | { | |
636 | .procname = "kexec_load_disabled", | |
637 | .data = &kexec_load_disabled, | |
638 | .maxlen = sizeof(int), | |
639 | .mode = 0644, | |
640 | /* only handle a transition from default "0" to "1" */ | |
641 | .proc_handler = proc_dointvec_minmax, | |
642 | .extra1 = &one, | |
643 | .extra2 = &one, | |
644 | }, | |
645 | #endif | |
646 | #ifdef CONFIG_MODULES | |
647 | { | |
648 | .procname = "modprobe", | |
649 | .data = &modprobe_path, | |
650 | .maxlen = KMOD_PATH_LEN, | |
651 | .mode = 0644, | |
652 | .proc_handler = proc_dostring, | |
653 | }, | |
654 | { | |
655 | .procname = "modules_disabled", | |
656 | .data = &modules_disabled, | |
657 | .maxlen = sizeof(int), | |
658 | .mode = 0644, | |
659 | /* only handle a transition from default "0" to "1" */ | |
660 | .proc_handler = proc_dointvec_minmax, | |
661 | .extra1 = &one, | |
662 | .extra2 = &one, | |
663 | }, | |
664 | #endif | |
665 | #ifdef CONFIG_UEVENT_HELPER | |
666 | { | |
667 | .procname = "hotplug", | |
668 | .data = &uevent_helper, | |
669 | .maxlen = UEVENT_HELPER_PATH_LEN, | |
670 | .mode = 0644, | |
671 | .proc_handler = proc_dostring, | |
672 | }, | |
673 | #endif | |
674 | #ifdef CONFIG_CHR_DEV_SG | |
675 | { | |
676 | .procname = "sg-big-buff", | |
677 | .data = &sg_big_buff, | |
678 | .maxlen = sizeof (int), | |
679 | .mode = 0444, | |
680 | .proc_handler = proc_dointvec, | |
681 | }, | |
682 | #endif | |
683 | #ifdef CONFIG_BSD_PROCESS_ACCT | |
684 | { | |
685 | .procname = "acct", | |
686 | .data = &acct_parm, | |
687 | .maxlen = 3*sizeof(int), | |
688 | .mode = 0644, | |
689 | .proc_handler = proc_dointvec, | |
690 | }, | |
691 | #endif | |
692 | #ifdef CONFIG_MAGIC_SYSRQ | |
693 | { | |
694 | .procname = "sysrq", | |
695 | .data = &__sysrq_enabled, | |
696 | .maxlen = sizeof (int), | |
697 | .mode = 0644, | |
698 | .proc_handler = sysrq_sysctl_handler, | |
699 | }, | |
700 | #endif | |
701 | #ifdef CONFIG_PROC_SYSCTL | |
702 | { | |
703 | .procname = "cad_pid", | |
704 | .data = NULL, | |
705 | .maxlen = sizeof (int), | |
706 | .mode = 0600, | |
707 | .proc_handler = proc_do_cad_pid, | |
708 | }, | |
709 | #endif | |
710 | { | |
711 | .procname = "threads-max", | |
712 | .data = &max_threads, | |
713 | .maxlen = sizeof(int), | |
714 | .mode = 0644, | |
715 | .proc_handler = proc_dointvec, | |
716 | }, | |
717 | { | |
718 | .procname = "random", | |
719 | .mode = 0555, | |
720 | .child = random_table, | |
721 | }, | |
722 | { | |
723 | .procname = "usermodehelper", | |
724 | .mode = 0555, | |
725 | .child = usermodehelper_table, | |
726 | }, | |
727 | { | |
728 | .procname = "overflowuid", | |
729 | .data = &overflowuid, | |
730 | .maxlen = sizeof(int), | |
731 | .mode = 0644, | |
732 | .proc_handler = proc_dointvec_minmax, | |
733 | .extra1 = &minolduid, | |
734 | .extra2 = &maxolduid, | |
735 | }, | |
736 | { | |
737 | .procname = "overflowgid", | |
738 | .data = &overflowgid, | |
739 | .maxlen = sizeof(int), | |
740 | .mode = 0644, | |
741 | .proc_handler = proc_dointvec_minmax, | |
742 | .extra1 = &minolduid, | |
743 | .extra2 = &maxolduid, | |
744 | }, | |
745 | #ifdef CONFIG_S390 | |
746 | #ifdef CONFIG_MATHEMU | |
747 | { | |
748 | .procname = "ieee_emulation_warnings", | |
749 | .data = &sysctl_ieee_emulation_warnings, | |
750 | .maxlen = sizeof(int), | |
751 | .mode = 0644, | |
752 | .proc_handler = proc_dointvec, | |
753 | }, | |
754 | #endif | |
755 | { | |
756 | .procname = "userprocess_debug", | |
757 | .data = &show_unhandled_signals, | |
758 | .maxlen = sizeof(int), | |
759 | .mode = 0644, | |
760 | .proc_handler = proc_dointvec, | |
761 | }, | |
762 | #endif | |
763 | { | |
764 | .procname = "pid_max", | |
765 | .data = &pid_max, | |
766 | .maxlen = sizeof (int), | |
767 | .mode = 0644, | |
768 | .proc_handler = proc_dointvec_minmax, | |
769 | .extra1 = &pid_max_min, | |
770 | .extra2 = &pid_max_max, | |
771 | }, | |
772 | { | |
773 | .procname = "panic_on_oops", | |
774 | .data = &panic_on_oops, | |
775 | .maxlen = sizeof(int), | |
776 | .mode = 0644, | |
777 | .proc_handler = proc_dointvec, | |
778 | }, | |
779 | #if defined CONFIG_PRINTK | |
780 | { | |
781 | .procname = "printk", | |
782 | .data = &console_loglevel, | |
783 | .maxlen = 4*sizeof(int), | |
784 | .mode = 0644, | |
785 | .proc_handler = proc_dointvec, | |
786 | }, | |
787 | { | |
788 | .procname = "printk_ratelimit", | |
789 | .data = &printk_ratelimit_state.interval, | |
790 | .maxlen = sizeof(int), | |
791 | .mode = 0644, | |
792 | .proc_handler = proc_dointvec_jiffies, | |
793 | }, | |
794 | { | |
795 | .procname = "printk_ratelimit_burst", | |
796 | .data = &printk_ratelimit_state.burst, | |
797 | .maxlen = sizeof(int), | |
798 | .mode = 0644, | |
799 | .proc_handler = proc_dointvec, | |
800 | }, | |
801 | { | |
802 | .procname = "printk_delay", | |
803 | .data = &printk_delay_msec, | |
804 | .maxlen = sizeof(int), | |
805 | .mode = 0644, | |
806 | .proc_handler = proc_dointvec_minmax, | |
807 | .extra1 = &zero, | |
808 | .extra2 = &ten_thousand, | |
809 | }, | |
810 | { | |
811 | .procname = "dmesg_restrict", | |
812 | .data = &dmesg_restrict, | |
813 | .maxlen = sizeof(int), | |
814 | .mode = 0644, | |
815 | .proc_handler = proc_dointvec_minmax_sysadmin, | |
816 | .extra1 = &zero, | |
817 | .extra2 = &one, | |
818 | }, | |
819 | { | |
820 | .procname = "kptr_restrict", | |
821 | .data = &kptr_restrict, | |
822 | .maxlen = sizeof(int), | |
823 | .mode = 0644, | |
824 | .proc_handler = proc_dointvec_minmax_sysadmin, | |
825 | .extra1 = &zero, | |
826 | .extra2 = &two, | |
827 | }, | |
828 | #endif | |
829 | { | |
830 | .procname = "ngroups_max", | |
831 | .data = &ngroups_max, | |
832 | .maxlen = sizeof (int), | |
833 | .mode = 0444, | |
834 | .proc_handler = proc_dointvec, | |
835 | }, | |
836 | { | |
837 | .procname = "cap_last_cap", | |
838 | .data = (void *)&cap_last_cap, | |
839 | .maxlen = sizeof(int), | |
840 | .mode = 0444, | |
841 | .proc_handler = proc_dointvec, | |
842 | }, | |
843 | #if defined(CONFIG_LOCKUP_DETECTOR) | |
844 | { | |
845 | .procname = "watchdog", | |
846 | .data = &watchdog_user_enabled, | |
847 | .maxlen = sizeof (int), | |
848 | .mode = 0644, | |
849 | .proc_handler = proc_dowatchdog, | |
850 | .extra1 = &zero, | |
851 | .extra2 = &one, | |
852 | }, | |
853 | { | |
854 | .procname = "watchdog_thresh", | |
855 | .data = &watchdog_thresh, | |
856 | .maxlen = sizeof(int), | |
857 | .mode = 0644, | |
858 | .proc_handler = proc_dowatchdog, | |
859 | .extra1 = &zero, | |
860 | .extra2 = &sixty, | |
861 | }, | |
862 | { | |
863 | .procname = "softlockup_panic", | |
864 | .data = &softlockup_panic, | |
865 | .maxlen = sizeof(int), | |
866 | .mode = 0644, | |
867 | .proc_handler = proc_dointvec_minmax, | |
868 | .extra1 = &zero, | |
869 | .extra2 = &one, | |
870 | }, | |
871 | #ifdef CONFIG_SMP | |
872 | { | |
873 | .procname = "softlockup_all_cpu_backtrace", | |
874 | .data = &sysctl_softlockup_all_cpu_backtrace, | |
875 | .maxlen = sizeof(int), | |
876 | .mode = 0644, | |
877 | .proc_handler = proc_dointvec_minmax, | |
878 | .extra1 = &zero, | |
879 | .extra2 = &one, | |
880 | }, | |
881 | #endif /* CONFIG_SMP */ | |
882 | { | |
883 | .procname = "nmi_watchdog", | |
884 | .data = &watchdog_user_enabled, | |
885 | .maxlen = sizeof (int), | |
886 | .mode = 0644, | |
887 | .proc_handler = proc_dowatchdog, | |
888 | .extra1 = &zero, | |
889 | .extra2 = &one, | |
890 | }, | |
891 | #endif | |
892 | #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86) | |
893 | { | |
894 | .procname = "unknown_nmi_panic", | |
895 | .data = &unknown_nmi_panic, | |
896 | .maxlen = sizeof (int), | |
897 | .mode = 0644, | |
898 | .proc_handler = proc_dointvec, | |
899 | }, | |
900 | #endif | |
901 | #if defined(CONFIG_X86) | |
902 | { | |
903 | .procname = "panic_on_unrecovered_nmi", | |
904 | .data = &panic_on_unrecovered_nmi, | |
905 | .maxlen = sizeof(int), | |
906 | .mode = 0644, | |
907 | .proc_handler = proc_dointvec, | |
908 | }, | |
909 | { | |
910 | .procname = "panic_on_io_nmi", | |
911 | .data = &panic_on_io_nmi, | |
912 | .maxlen = sizeof(int), | |
913 | .mode = 0644, | |
914 | .proc_handler = proc_dointvec, | |
915 | }, | |
916 | #ifdef CONFIG_DEBUG_STACKOVERFLOW | |
917 | { | |
918 | .procname = "panic_on_stackoverflow", | |
919 | .data = &sysctl_panic_on_stackoverflow, | |
920 | .maxlen = sizeof(int), | |
921 | .mode = 0644, | |
922 | .proc_handler = proc_dointvec, | |
923 | }, | |
924 | #endif | |
925 | { | |
926 | .procname = "bootloader_type", | |
927 | .data = &bootloader_type, | |
928 | .maxlen = sizeof (int), | |
929 | .mode = 0444, | |
930 | .proc_handler = proc_dointvec, | |
931 | }, | |
932 | { | |
933 | .procname = "bootloader_version", | |
934 | .data = &bootloader_version, | |
935 | .maxlen = sizeof (int), | |
936 | .mode = 0444, | |
937 | .proc_handler = proc_dointvec, | |
938 | }, | |
939 | { | |
940 | .procname = "kstack_depth_to_print", | |
941 | .data = &kstack_depth_to_print, | |
942 | .maxlen = sizeof(int), | |
943 | .mode = 0644, | |
944 | .proc_handler = proc_dointvec, | |
945 | }, | |
946 | { | |
947 | .procname = "io_delay_type", | |
948 | .data = &io_delay_type, | |
949 | .maxlen = sizeof(int), | |
950 | .mode = 0644, | |
951 | .proc_handler = proc_dointvec, | |
952 | }, | |
953 | #endif | |
954 | #if defined(CONFIG_MMU) | |
955 | { | |
956 | .procname = "randomize_va_space", | |
957 | .data = &randomize_va_space, | |
958 | .maxlen = sizeof(int), | |
959 | .mode = 0644, | |
960 | .proc_handler = proc_dointvec, | |
961 | }, | |
962 | #endif | |
963 | #if defined(CONFIG_S390) && defined(CONFIG_SMP) | |
964 | { | |
965 | .procname = "spin_retry", | |
966 | .data = &spin_retry, | |
967 | .maxlen = sizeof (int), | |
968 | .mode = 0644, | |
969 | .proc_handler = proc_dointvec, | |
970 | }, | |
971 | #endif | |
972 | #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86) | |
973 | { | |
974 | .procname = "acpi_video_flags", | |
975 | .data = &acpi_realmode_flags, | |
976 | .maxlen = sizeof (unsigned long), | |
977 | .mode = 0644, | |
978 | .proc_handler = proc_doulongvec_minmax, | |
979 | }, | |
980 | #endif | |
981 | #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN | |
982 | { | |
983 | .procname = "ignore-unaligned-usertrap", | |
984 | .data = &no_unaligned_warning, | |
985 | .maxlen = sizeof (int), | |
986 | .mode = 0644, | |
987 | .proc_handler = proc_dointvec, | |
988 | }, | |
989 | #endif | |
990 | #ifdef CONFIG_IA64 | |
991 | { | |
992 | .procname = "unaligned-dump-stack", | |
993 | .data = &unaligned_dump_stack, | |
994 | .maxlen = sizeof (int), | |
995 | .mode = 0644, | |
996 | .proc_handler = proc_dointvec, | |
997 | }, | |
998 | #endif | |
999 | #ifdef CONFIG_DETECT_HUNG_TASK | |
1000 | { | |
1001 | .procname = "hung_task_panic", | |
1002 | .data = &sysctl_hung_task_panic, | |
1003 | .maxlen = sizeof(int), | |
1004 | .mode = 0644, | |
1005 | .proc_handler = proc_dointvec_minmax, | |
1006 | .extra1 = &zero, | |
1007 | .extra2 = &one, | |
1008 | }, | |
1009 | { | |
1010 | .procname = "hung_task_check_count", | |
1011 | .data = &sysctl_hung_task_check_count, | |
1012 | .maxlen = sizeof(int), | |
1013 | .mode = 0644, | |
1014 | .proc_handler = proc_dointvec_minmax, | |
1015 | .extra1 = &zero, | |
1016 | }, | |
1017 | { | |
1018 | .procname = "hung_task_timeout_secs", | |
1019 | .data = &sysctl_hung_task_timeout_secs, | |
1020 | .maxlen = sizeof(unsigned long), | |
1021 | .mode = 0644, | |
1022 | .proc_handler = proc_dohung_task_timeout_secs, | |
1023 | .extra2 = &hung_task_timeout_max, | |
1024 | }, | |
1025 | { | |
1026 | .procname = "hung_task_warnings", | |
1027 | .data = &sysctl_hung_task_warnings, | |
1028 | .maxlen = sizeof(int), | |
1029 | .mode = 0644, | |
1030 | .proc_handler = proc_dointvec_minmax, | |
1031 | .extra1 = &neg_one, | |
1032 | }, | |
1033 | #endif | |
1034 | #ifdef CONFIG_COMPAT | |
1035 | { | |
1036 | .procname = "compat-log", | |
1037 | .data = &compat_log, | |
1038 | .maxlen = sizeof (int), | |
1039 | .mode = 0644, | |
1040 | .proc_handler = proc_dointvec, | |
1041 | }, | |
1042 | #endif | |
1043 | #ifdef CONFIG_RT_MUTEXES | |
1044 | { | |
1045 | .procname = "max_lock_depth", | |
1046 | .data = &max_lock_depth, | |
1047 | .maxlen = sizeof(int), | |
1048 | .mode = 0644, | |
1049 | .proc_handler = proc_dointvec, | |
1050 | }, | |
1051 | #endif | |
1052 | { | |
1053 | .procname = "poweroff_cmd", | |
1054 | .data = &poweroff_cmd, | |
1055 | .maxlen = POWEROFF_CMD_PATH_LEN, | |
1056 | .mode = 0644, | |
1057 | .proc_handler = proc_dostring, | |
1058 | }, | |
1059 | #ifdef CONFIG_KEYS | |
1060 | { | |
1061 | .procname = "keys", | |
1062 | .mode = 0555, | |
1063 | .child = key_sysctls, | |
1064 | }, | |
1065 | #endif | |
1066 | #ifdef CONFIG_PERF_EVENTS | |
1067 | /* | |
1068 | * User-space scripts rely on the existence of this file | |
1069 | * as a feature check for perf_events being enabled. | |
1070 | * | |
1071 | * So it's an ABI, do not remove! | |
1072 | */ | |
1073 | { | |
1074 | .procname = "perf_event_paranoid", | |
1075 | .data = &sysctl_perf_event_paranoid, | |
1076 | .maxlen = sizeof(sysctl_perf_event_paranoid), | |
1077 | .mode = 0644, | |
1078 | .proc_handler = proc_dointvec, | |
1079 | }, | |
1080 | { | |
1081 | .procname = "perf_event_mlock_kb", | |
1082 | .data = &sysctl_perf_event_mlock, | |
1083 | .maxlen = sizeof(sysctl_perf_event_mlock), | |
1084 | .mode = 0644, | |
1085 | .proc_handler = proc_dointvec, | |
1086 | }, | |
1087 | { | |
1088 | .procname = "perf_event_max_sample_rate", | |
1089 | .data = &sysctl_perf_event_sample_rate, | |
1090 | .maxlen = sizeof(sysctl_perf_event_sample_rate), | |
1091 | .mode = 0644, | |
1092 | .proc_handler = perf_proc_update_handler, | |
1093 | .extra1 = &one, | |
1094 | }, | |
1095 | { | |
1096 | .procname = "perf_cpu_time_max_percent", | |
1097 | .data = &sysctl_perf_cpu_time_max_percent, | |
1098 | .maxlen = sizeof(sysctl_perf_cpu_time_max_percent), | |
1099 | .mode = 0644, | |
1100 | .proc_handler = perf_cpu_time_max_percent_handler, | |
1101 | .extra1 = &zero, | |
1102 | .extra2 = &one_hundred, | |
1103 | }, | |
1104 | #endif | |
1105 | #ifdef CONFIG_KMEMCHECK | |
1106 | { | |
1107 | .procname = "kmemcheck", | |
1108 | .data = &kmemcheck_enabled, | |
1109 | .maxlen = sizeof(int), | |
1110 | .mode = 0644, | |
1111 | .proc_handler = proc_dointvec, | |
1112 | }, | |
1113 | #endif | |
1114 | { | |
1115 | .procname = "panic_on_warn", | |
1116 | .data = &panic_on_warn, | |
1117 | .maxlen = sizeof(int), | |
1118 | .mode = 0644, | |
1119 | .proc_handler = proc_dointvec_minmax, | |
1120 | .extra1 = &zero, | |
1121 | .extra2 = &one, | |
1122 | }, | |
1123 | { } | |
1124 | }; | |
1125 | ||
1126 | static struct ctl_table vm_table[] = { | |
1127 | { | |
1128 | .procname = "overcommit_memory", | |
1129 | .data = &sysctl_overcommit_memory, | |
1130 | .maxlen = sizeof(sysctl_overcommit_memory), | |
1131 | .mode = 0644, | |
1132 | .proc_handler = proc_dointvec_minmax, | |
1133 | .extra1 = &zero, | |
1134 | .extra2 = &two, | |
1135 | }, | |
1136 | { | |
1137 | .procname = "panic_on_oom", | |
1138 | .data = &sysctl_panic_on_oom, | |
1139 | .maxlen = sizeof(sysctl_panic_on_oom), | |
1140 | .mode = 0644, | |
1141 | .proc_handler = proc_dointvec_minmax, | |
1142 | .extra1 = &zero, | |
1143 | .extra2 = &two, | |
1144 | }, | |
1145 | { | |
1146 | .procname = "oom_kill_allocating_task", | |
1147 | .data = &sysctl_oom_kill_allocating_task, | |
1148 | .maxlen = sizeof(sysctl_oom_kill_allocating_task), | |
1149 | .mode = 0644, | |
1150 | .proc_handler = proc_dointvec, | |
1151 | }, | |
1152 | { | |
1153 | .procname = "oom_dump_tasks", | |
1154 | .data = &sysctl_oom_dump_tasks, | |
1155 | .maxlen = sizeof(sysctl_oom_dump_tasks), | |
1156 | .mode = 0644, | |
1157 | .proc_handler = proc_dointvec, | |
1158 | }, | |
1159 | { | |
1160 | .procname = "overcommit_ratio", | |
1161 | .data = &sysctl_overcommit_ratio, | |
1162 | .maxlen = sizeof(sysctl_overcommit_ratio), | |
1163 | .mode = 0644, | |
1164 | .proc_handler = overcommit_ratio_handler, | |
1165 | }, | |
1166 | { | |
1167 | .procname = "overcommit_kbytes", | |
1168 | .data = &sysctl_overcommit_kbytes, | |
1169 | .maxlen = sizeof(sysctl_overcommit_kbytes), | |
1170 | .mode = 0644, | |
1171 | .proc_handler = overcommit_kbytes_handler, | |
1172 | }, | |
1173 | { | |
1174 | .procname = "page-cluster", | |
1175 | .data = &page_cluster, | |
1176 | .maxlen = sizeof(int), | |
1177 | .mode = 0644, | |
1178 | .proc_handler = proc_dointvec_minmax, | |
1179 | .extra1 = &zero, | |
1180 | }, | |
1181 | { | |
1182 | .procname = "dirty_background_ratio", | |
1183 | .data = &dirty_background_ratio, | |
1184 | .maxlen = sizeof(dirty_background_ratio), | |
1185 | .mode = 0644, | |
1186 | .proc_handler = dirty_background_ratio_handler, | |
1187 | .extra1 = &zero, | |
1188 | .extra2 = &one_hundred, | |
1189 | }, | |
1190 | { | |
1191 | .procname = "dirty_background_bytes", | |
1192 | .data = &dirty_background_bytes, | |
1193 | .maxlen = sizeof(dirty_background_bytes), | |
1194 | .mode = 0644, | |
1195 | .proc_handler = dirty_background_bytes_handler, | |
1196 | .extra1 = &one_ul, | |
1197 | }, | |
1198 | { | |
1199 | .procname = "dirty_ratio", | |
1200 | .data = &vm_dirty_ratio, | |
1201 | .maxlen = sizeof(vm_dirty_ratio), | |
1202 | .mode = 0644, | |
1203 | .proc_handler = dirty_ratio_handler, | |
1204 | .extra1 = &zero, | |
1205 | .extra2 = &one_hundred, | |
1206 | }, | |
1207 | { | |
1208 | .procname = "dirty_bytes", | |
1209 | .data = &vm_dirty_bytes, | |
1210 | .maxlen = sizeof(vm_dirty_bytes), | |
1211 | .mode = 0644, | |
1212 | .proc_handler = dirty_bytes_handler, | |
1213 | .extra1 = &dirty_bytes_min, | |
1214 | }, | |
1215 | { | |
1216 | .procname = "dirty_writeback_centisecs", | |
1217 | .data = &dirty_writeback_interval, | |
1218 | .maxlen = sizeof(dirty_writeback_interval), | |
1219 | .mode = 0644, | |
1220 | .proc_handler = dirty_writeback_centisecs_handler, | |
1221 | }, | |
1222 | { | |
1223 | .procname = "dirty_expire_centisecs", | |
1224 | .data = &dirty_expire_interval, | |
1225 | .maxlen = sizeof(dirty_expire_interval), | |
1226 | .mode = 0644, | |
1227 | .proc_handler = proc_dointvec_minmax, | |
1228 | .extra1 = &zero, | |
1229 | }, | |
1230 | { | |
1231 | .procname = "nr_pdflush_threads", | |
1232 | .mode = 0444 /* read-only */, | |
1233 | .proc_handler = pdflush_proc_obsolete, | |
1234 | }, | |
1235 | { | |
1236 | .procname = "swappiness", | |
1237 | .data = &vm_swappiness, | |
1238 | .maxlen = sizeof(vm_swappiness), | |
1239 | .mode = 0644, | |
1240 | .proc_handler = proc_dointvec_minmax, | |
1241 | .extra1 = &zero, | |
1242 | .extra2 = &one_hundred, | |
1243 | }, | |
1244 | #ifdef CONFIG_HUGETLB_PAGE | |
1245 | { | |
1246 | .procname = "nr_hugepages", | |
1247 | .data = NULL, | |
1248 | .maxlen = sizeof(unsigned long), | |
1249 | .mode = 0644, | |
1250 | .proc_handler = hugetlb_sysctl_handler, | |
1251 | }, | |
1252 | #ifdef CONFIG_NUMA | |
1253 | { | |
1254 | .procname = "nr_hugepages_mempolicy", | |
1255 | .data = NULL, | |
1256 | .maxlen = sizeof(unsigned long), | |
1257 | .mode = 0644, | |
1258 | .proc_handler = &hugetlb_mempolicy_sysctl_handler, | |
1259 | }, | |
1260 | #endif | |
1261 | { | |
1262 | .procname = "hugetlb_shm_group", | |
1263 | .data = &sysctl_hugetlb_shm_group, | |
1264 | .maxlen = sizeof(gid_t), | |
1265 | .mode = 0644, | |
1266 | .proc_handler = proc_dointvec, | |
1267 | }, | |
1268 | { | |
1269 | .procname = "hugepages_treat_as_movable", | |
1270 | .data = &hugepages_treat_as_movable, | |
1271 | .maxlen = sizeof(int), | |
1272 | .mode = 0644, | |
1273 | .proc_handler = proc_dointvec, | |
1274 | }, | |
1275 | { | |
1276 | .procname = "nr_overcommit_hugepages", | |
1277 | .data = NULL, | |
1278 | .maxlen = sizeof(unsigned long), | |
1279 | .mode = 0644, | |
1280 | .proc_handler = hugetlb_overcommit_handler, | |
1281 | }, | |
1282 | #endif | |
1283 | { | |
1284 | .procname = "lowmem_reserve_ratio", | |
1285 | .data = &sysctl_lowmem_reserve_ratio, | |
1286 | .maxlen = sizeof(sysctl_lowmem_reserve_ratio), | |
1287 | .mode = 0644, | |
1288 | .proc_handler = lowmem_reserve_ratio_sysctl_handler, | |
1289 | }, | |
1290 | { | |
1291 | .procname = "drop_caches", | |
1292 | .data = &sysctl_drop_caches, | |
1293 | .maxlen = sizeof(int), | |
1294 | .mode = 0644, | |
1295 | .proc_handler = drop_caches_sysctl_handler, | |
1296 | .extra1 = &one, | |
1297 | .extra2 = &four, | |
1298 | }, | |
1299 | #ifdef CONFIG_COMPACTION | |
1300 | { | |
1301 | .procname = "compact_memory", | |
1302 | .data = &sysctl_compact_memory, | |
1303 | .maxlen = sizeof(int), | |
1304 | .mode = 0200, | |
1305 | .proc_handler = sysctl_compaction_handler, | |
1306 | }, | |
1307 | { | |
1308 | .procname = "extfrag_threshold", | |
1309 | .data = &sysctl_extfrag_threshold, | |
1310 | .maxlen = sizeof(int), | |
1311 | .mode = 0644, | |
1312 | .proc_handler = sysctl_extfrag_handler, | |
1313 | .extra1 = &min_extfrag_threshold, | |
1314 | .extra2 = &max_extfrag_threshold, | |
1315 | }, | |
1316 | ||
1317 | #endif /* CONFIG_COMPACTION */ | |
1318 | { | |
1319 | .procname = "min_free_kbytes", | |
1320 | .data = &min_free_kbytes, | |
1321 | .maxlen = sizeof(min_free_kbytes), | |
1322 | .mode = 0644, | |
1323 | .proc_handler = min_free_kbytes_sysctl_handler, | |
1324 | .extra1 = &zero, | |
1325 | }, | |
1326 | { | |
1327 | .procname = "percpu_pagelist_fraction", | |
1328 | .data = &percpu_pagelist_fraction, | |
1329 | .maxlen = sizeof(percpu_pagelist_fraction), | |
1330 | .mode = 0644, | |
1331 | .proc_handler = percpu_pagelist_fraction_sysctl_handler, | |
1332 | .extra1 = &zero, | |
1333 | }, | |
1334 | #ifdef CONFIG_MMU | |
1335 | { | |
1336 | .procname = "max_map_count", | |
1337 | .data = &sysctl_max_map_count, | |
1338 | .maxlen = sizeof(sysctl_max_map_count), | |
1339 | .mode = 0644, | |
1340 | .proc_handler = proc_dointvec_minmax, | |
1341 | .extra1 = &zero, | |
1342 | }, | |
1343 | #else | |
1344 | { | |
1345 | .procname = "nr_trim_pages", | |
1346 | .data = &sysctl_nr_trim_pages, | |
1347 | .maxlen = sizeof(sysctl_nr_trim_pages), | |
1348 | .mode = 0644, | |
1349 | .proc_handler = proc_dointvec_minmax, | |
1350 | .extra1 = &zero, | |
1351 | }, | |
1352 | #endif | |
1353 | { | |
1354 | .procname = "laptop_mode", | |
1355 | .data = &laptop_mode, | |
1356 | .maxlen = sizeof(laptop_mode), | |
1357 | .mode = 0644, | |
1358 | .proc_handler = proc_dointvec_jiffies, | |
1359 | }, | |
1360 | { | |
1361 | .procname = "block_dump", | |
1362 | .data = &block_dump, | |
1363 | .maxlen = sizeof(block_dump), | |
1364 | .mode = 0644, | |
1365 | .proc_handler = proc_dointvec, | |
1366 | .extra1 = &zero, | |
1367 | }, | |
1368 | { | |
1369 | .procname = "vfs_cache_pressure", | |
1370 | .data = &sysctl_vfs_cache_pressure, | |
1371 | .maxlen = sizeof(sysctl_vfs_cache_pressure), | |
1372 | .mode = 0644, | |
1373 | .proc_handler = proc_dointvec, | |
1374 | .extra1 = &zero, | |
1375 | }, | |
1376 | #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT | |
1377 | { | |
1378 | .procname = "legacy_va_layout", | |
1379 | .data = &sysctl_legacy_va_layout, | |
1380 | .maxlen = sizeof(sysctl_legacy_va_layout), | |
1381 | .mode = 0644, | |
1382 | .proc_handler = proc_dointvec, | |
1383 | .extra1 = &zero, | |
1384 | }, | |
1385 | #endif | |
1386 | #ifdef CONFIG_NUMA | |
1387 | { | |
1388 | .procname = "zone_reclaim_mode", | |
1389 | .data = &zone_reclaim_mode, | |
1390 | .maxlen = sizeof(zone_reclaim_mode), | |
1391 | .mode = 0644, | |
1392 | .proc_handler = proc_dointvec, | |
1393 | .extra1 = &zero, | |
1394 | }, | |
1395 | { | |
1396 | .procname = "min_unmapped_ratio", | |
1397 | .data = &sysctl_min_unmapped_ratio, | |
1398 | .maxlen = sizeof(sysctl_min_unmapped_ratio), | |
1399 | .mode = 0644, | |
1400 | .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler, | |
1401 | .extra1 = &zero, | |
1402 | .extra2 = &one_hundred, | |
1403 | }, | |
1404 | { | |
1405 | .procname = "min_slab_ratio", | |
1406 | .data = &sysctl_min_slab_ratio, | |
1407 | .maxlen = sizeof(sysctl_min_slab_ratio), | |
1408 | .mode = 0644, | |
1409 | .proc_handler = sysctl_min_slab_ratio_sysctl_handler, | |
1410 | .extra1 = &zero, | |
1411 | .extra2 = &one_hundred, | |
1412 | }, | |
1413 | #endif | |
1414 | #ifdef CONFIG_SMP | |
1415 | { | |
1416 | .procname = "stat_interval", | |
1417 | .data = &sysctl_stat_interval, | |
1418 | .maxlen = sizeof(sysctl_stat_interval), | |
1419 | .mode = 0644, | |
1420 | .proc_handler = proc_dointvec_jiffies, | |
1421 | }, | |
1422 | #endif | |
1423 | #ifdef CONFIG_MMU | |
1424 | { | |
1425 | .procname = "mmap_min_addr", | |
1426 | .data = &dac_mmap_min_addr, | |
1427 | .maxlen = sizeof(unsigned long), | |
1428 | .mode = 0644, | |
1429 | .proc_handler = mmap_min_addr_handler, | |
1430 | }, | |
1431 | #endif | |
1432 | #ifdef CONFIG_NUMA | |
1433 | { | |
1434 | .procname = "numa_zonelist_order", | |
1435 | .data = &numa_zonelist_order, | |
1436 | .maxlen = NUMA_ZONELIST_ORDER_LEN, | |
1437 | .mode = 0644, | |
1438 | .proc_handler = numa_zonelist_order_handler, | |
1439 | }, | |
1440 | #endif | |
1441 | #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \ | |
1442 | (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL)) | |
1443 | { | |
1444 | .procname = "vdso_enabled", | |
1445 | #ifdef CONFIG_X86_32 | |
1446 | .data = &vdso32_enabled, | |
1447 | .maxlen = sizeof(vdso32_enabled), | |
1448 | #else | |
1449 | .data = &vdso_enabled, | |
1450 | .maxlen = sizeof(vdso_enabled), | |
1451 | #endif | |
1452 | .mode = 0644, | |
1453 | .proc_handler = proc_dointvec, | |
1454 | .extra1 = &zero, | |
1455 | }, | |
1456 | #endif | |
1457 | #ifdef CONFIG_HIGHMEM | |
1458 | { | |
1459 | .procname = "highmem_is_dirtyable", | |
1460 | .data = &vm_highmem_is_dirtyable, | |
1461 | .maxlen = sizeof(vm_highmem_is_dirtyable), | |
1462 | .mode = 0644, | |
1463 | .proc_handler = proc_dointvec_minmax, | |
1464 | .extra1 = &zero, | |
1465 | .extra2 = &one, | |
1466 | }, | |
1467 | #endif | |
1468 | #ifdef CONFIG_MEMORY_FAILURE | |
1469 | { | |
1470 | .procname = "memory_failure_early_kill", | |
1471 | .data = &sysctl_memory_failure_early_kill, | |
1472 | .maxlen = sizeof(sysctl_memory_failure_early_kill), | |
1473 | .mode = 0644, | |
1474 | .proc_handler = proc_dointvec_minmax, | |
1475 | .extra1 = &zero, | |
1476 | .extra2 = &one, | |
1477 | }, | |
1478 | { | |
1479 | .procname = "memory_failure_recovery", | |
1480 | .data = &sysctl_memory_failure_recovery, | |
1481 | .maxlen = sizeof(sysctl_memory_failure_recovery), | |
1482 | .mode = 0644, | |
1483 | .proc_handler = proc_dointvec_minmax, | |
1484 | .extra1 = &zero, | |
1485 | .extra2 = &one, | |
1486 | }, | |
1487 | #endif | |
1488 | { | |
1489 | .procname = "user_reserve_kbytes", | |
1490 | .data = &sysctl_user_reserve_kbytes, | |
1491 | .maxlen = sizeof(sysctl_user_reserve_kbytes), | |
1492 | .mode = 0644, | |
1493 | .proc_handler = proc_doulongvec_minmax, | |
1494 | }, | |
1495 | { | |
1496 | .procname = "admin_reserve_kbytes", | |
1497 | .data = &sysctl_admin_reserve_kbytes, | |
1498 | .maxlen = sizeof(sysctl_admin_reserve_kbytes), | |
1499 | .mode = 0644, | |
1500 | .proc_handler = proc_doulongvec_minmax, | |
1501 | }, | |
1502 | { } | |
1503 | }; | |
1504 | ||
1505 | #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) | |
1506 | static struct ctl_table binfmt_misc_table[] = { | |
1507 | { } | |
1508 | }; | |
1509 | #endif | |
1510 | ||
1511 | static struct ctl_table fs_table[] = { | |
1512 | { | |
1513 | .procname = "inode-nr", | |
1514 | .data = &inodes_stat, | |
1515 | .maxlen = 2*sizeof(long), | |
1516 | .mode = 0444, | |
1517 | .proc_handler = proc_nr_inodes, | |
1518 | }, | |
1519 | { | |
1520 | .procname = "inode-state", | |
1521 | .data = &inodes_stat, | |
1522 | .maxlen = 7*sizeof(long), | |
1523 | .mode = 0444, | |
1524 | .proc_handler = proc_nr_inodes, | |
1525 | }, | |
1526 | { | |
1527 | .procname = "file-nr", | |
1528 | .data = &files_stat, | |
1529 | .maxlen = sizeof(files_stat), | |
1530 | .mode = 0444, | |
1531 | .proc_handler = proc_nr_files, | |
1532 | }, | |
1533 | { | |
1534 | .procname = "file-max", | |
1535 | .data = &files_stat.max_files, | |
1536 | .maxlen = sizeof(files_stat.max_files), | |
1537 | .mode = 0644, | |
1538 | .proc_handler = proc_doulongvec_minmax, | |
1539 | }, | |
1540 | { | |
1541 | .procname = "nr_open", | |
1542 | .data = &sysctl_nr_open, | |
1543 | .maxlen = sizeof(int), | |
1544 | .mode = 0644, | |
1545 | .proc_handler = proc_dointvec_minmax, | |
1546 | .extra1 = &sysctl_nr_open_min, | |
1547 | .extra2 = &sysctl_nr_open_max, | |
1548 | }, | |
1549 | { | |
1550 | .procname = "dentry-state", | |
1551 | .data = &dentry_stat, | |
1552 | .maxlen = 6*sizeof(long), | |
1553 | .mode = 0444, | |
1554 | .proc_handler = proc_nr_dentry, | |
1555 | }, | |
1556 | { | |
1557 | .procname = "overflowuid", | |
1558 | .data = &fs_overflowuid, | |
1559 | .maxlen = sizeof(int), | |
1560 | .mode = 0644, | |
1561 | .proc_handler = proc_dointvec_minmax, | |
1562 | .extra1 = &minolduid, | |
1563 | .extra2 = &maxolduid, | |
1564 | }, | |
1565 | { | |
1566 | .procname = "overflowgid", | |
1567 | .data = &fs_overflowgid, | |
1568 | .maxlen = sizeof(int), | |
1569 | .mode = 0644, | |
1570 | .proc_handler = proc_dointvec_minmax, | |
1571 | .extra1 = &minolduid, | |
1572 | .extra2 = &maxolduid, | |
1573 | }, | |
1574 | #ifdef CONFIG_FILE_LOCKING | |
1575 | { | |
1576 | .procname = "leases-enable", | |
1577 | .data = &leases_enable, | |
1578 | .maxlen = sizeof(int), | |
1579 | .mode = 0644, | |
1580 | .proc_handler = proc_dointvec, | |
1581 | }, | |
1582 | #endif | |
1583 | #ifdef CONFIG_DNOTIFY | |
1584 | { | |
1585 | .procname = "dir-notify-enable", | |
1586 | .data = &dir_notify_enable, | |
1587 | .maxlen = sizeof(int), | |
1588 | .mode = 0644, | |
1589 | .proc_handler = proc_dointvec, | |
1590 | }, | |
1591 | #endif | |
1592 | #ifdef CONFIG_MMU | |
1593 | #ifdef CONFIG_FILE_LOCKING | |
1594 | { | |
1595 | .procname = "lease-break-time", | |
1596 | .data = &lease_break_time, | |
1597 | .maxlen = sizeof(int), | |
1598 | .mode = 0644, | |
1599 | .proc_handler = proc_dointvec, | |
1600 | }, | |
1601 | #endif | |
1602 | #ifdef CONFIG_AIO | |
1603 | { | |
1604 | .procname = "aio-nr", | |
1605 | .data = &aio_nr, | |
1606 | .maxlen = sizeof(aio_nr), | |
1607 | .mode = 0444, | |
1608 | .proc_handler = proc_doulongvec_minmax, | |
1609 | }, | |
1610 | { | |
1611 | .procname = "aio-max-nr", | |
1612 | .data = &aio_max_nr, | |
1613 | .maxlen = sizeof(aio_max_nr), | |
1614 | .mode = 0644, | |
1615 | .proc_handler = proc_doulongvec_minmax, | |
1616 | }, | |
1617 | #endif /* CONFIG_AIO */ | |
1618 | #ifdef CONFIG_INOTIFY_USER | |
1619 | { | |
1620 | .procname = "inotify", | |
1621 | .mode = 0555, | |
1622 | .child = inotify_table, | |
1623 | }, | |
1624 | #endif | |
1625 | #ifdef CONFIG_EPOLL | |
1626 | { | |
1627 | .procname = "epoll", | |
1628 | .mode = 0555, | |
1629 | .child = epoll_table, | |
1630 | }, | |
1631 | #endif | |
1632 | #endif | |
1633 | { | |
1634 | .procname = "protected_symlinks", | |
1635 | .data = &sysctl_protected_symlinks, | |
1636 | .maxlen = sizeof(int), | |
1637 | .mode = 0600, | |
1638 | .proc_handler = proc_dointvec_minmax, | |
1639 | .extra1 = &zero, | |
1640 | .extra2 = &one, | |
1641 | }, | |
1642 | { | |
1643 | .procname = "protected_hardlinks", | |
1644 | .data = &sysctl_protected_hardlinks, | |
1645 | .maxlen = sizeof(int), | |
1646 | .mode = 0600, | |
1647 | .proc_handler = proc_dointvec_minmax, | |
1648 | .extra1 = &zero, | |
1649 | .extra2 = &one, | |
1650 | }, | |
1651 | { | |
1652 | .procname = "suid_dumpable", | |
1653 | .data = &suid_dumpable, | |
1654 | .maxlen = sizeof(int), | |
1655 | .mode = 0644, | |
1656 | .proc_handler = proc_dointvec_minmax_coredump, | |
1657 | .extra1 = &zero, | |
1658 | .extra2 = &two, | |
1659 | }, | |
1660 | #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) | |
1661 | { | |
1662 | .procname = "binfmt_misc", | |
1663 | .mode = 0555, | |
1664 | .child = binfmt_misc_table, | |
1665 | }, | |
1666 | #endif | |
1667 | { | |
1668 | .procname = "pipe-max-size", | |
1669 | .data = &pipe_max_size, | |
1670 | .maxlen = sizeof(int), | |
1671 | .mode = 0644, | |
1672 | .proc_handler = &pipe_proc_fn, | |
1673 | .extra1 = &pipe_min_size, | |
1674 | }, | |
1675 | { } | |
1676 | }; | |
1677 | ||
1678 | static struct ctl_table debug_table[] = { | |
1679 | #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE | |
1680 | { | |
1681 | .procname = "exception-trace", | |
1682 | .data = &show_unhandled_signals, | |
1683 | .maxlen = sizeof(int), | |
1684 | .mode = 0644, | |
1685 | .proc_handler = proc_dointvec | |
1686 | }, | |
1687 | #endif | |
1688 | #if defined(CONFIG_OPTPROBES) | |
1689 | { | |
1690 | .procname = "kprobes-optimization", | |
1691 | .data = &sysctl_kprobes_optimization, | |
1692 | .maxlen = sizeof(int), | |
1693 | .mode = 0644, | |
1694 | .proc_handler = proc_kprobes_optimization_handler, | |
1695 | .extra1 = &zero, | |
1696 | .extra2 = &one, | |
1697 | }, | |
1698 | #endif | |
1699 | { } | |
1700 | }; | |
1701 | ||
1702 | static struct ctl_table dev_table[] = { | |
1703 | { } | |
1704 | }; | |
1705 | ||
1706 | int __init sysctl_init(void) | |
1707 | { | |
1708 | struct ctl_table_header *hdr; | |
1709 | ||
1710 | hdr = register_sysctl_table(sysctl_base_table); | |
1711 | kmemleak_not_leak(hdr); | |
1712 | return 0; | |
1713 | } | |
1714 | ||
1715 | #endif /* CONFIG_SYSCTL */ | |
1716 | ||
1717 | /* | |
1718 | * /proc/sys support | |
1719 | */ | |
1720 | ||
1721 | #ifdef CONFIG_PROC_SYSCTL | |
1722 | ||
1723 | static int _proc_do_string(char *data, int maxlen, int write, | |
1724 | char __user *buffer, | |
1725 | size_t *lenp, loff_t *ppos) | |
1726 | { | |
1727 | size_t len; | |
1728 | char __user *p; | |
1729 | char c; | |
1730 | ||
1731 | if (!data || !maxlen || !*lenp) { | |
1732 | *lenp = 0; | |
1733 | return 0; | |
1734 | } | |
1735 | ||
1736 | if (write) { | |
1737 | if (sysctl_writes_strict == SYSCTL_WRITES_STRICT) { | |
1738 | /* Only continue writes not past the end of buffer. */ | |
1739 | len = strlen(data); | |
1740 | if (len > maxlen - 1) | |
1741 | len = maxlen - 1; | |
1742 | ||
1743 | if (*ppos > len) | |
1744 | return 0; | |
1745 | len = *ppos; | |
1746 | } else { | |
1747 | /* Start writing from beginning of buffer. */ | |
1748 | len = 0; | |
1749 | } | |
1750 | ||
1751 | *ppos += *lenp; | |
1752 | p = buffer; | |
1753 | while ((p - buffer) < *lenp && len < maxlen - 1) { | |
1754 | if (get_user(c, p++)) | |
1755 | return -EFAULT; | |
1756 | if (c == 0 || c == '\n') | |
1757 | break; | |
1758 | data[len++] = c; | |
1759 | } | |
1760 | data[len] = 0; | |
1761 | } else { | |
1762 | len = strlen(data); | |
1763 | if (len > maxlen) | |
1764 | len = maxlen; | |
1765 | ||
1766 | if (*ppos > len) { | |
1767 | *lenp = 0; | |
1768 | return 0; | |
1769 | } | |
1770 | ||
1771 | data += *ppos; | |
1772 | len -= *ppos; | |
1773 | ||
1774 | if (len > *lenp) | |
1775 | len = *lenp; | |
1776 | if (len) | |
1777 | if (copy_to_user(buffer, data, len)) | |
1778 | return -EFAULT; | |
1779 | if (len < *lenp) { | |
1780 | if (put_user('\n', buffer + len)) | |
1781 | return -EFAULT; | |
1782 | len++; | |
1783 | } | |
1784 | *lenp = len; | |
1785 | *ppos += len; | |
1786 | } | |
1787 | return 0; | |
1788 | } | |
1789 | ||
1790 | static void warn_sysctl_write(struct ctl_table *table) | |
1791 | { | |
1792 | pr_warn_once("%s wrote to %s when file position was not 0!\n" | |
1793 | "This will not be supported in the future. To silence this\n" | |
1794 | "warning, set kernel.sysctl_writes_strict = -1\n", | |
1795 | current->comm, table->procname); | |
1796 | } | |
1797 | ||
1798 | /** | |
1799 | * proc_dostring - read a string sysctl | |
1800 | * @table: the sysctl table | |
1801 | * @write: %TRUE if this is a write to the sysctl file | |
1802 | * @buffer: the user buffer | |
1803 | * @lenp: the size of the user buffer | |
1804 | * @ppos: file position | |
1805 | * | |
1806 | * Reads/writes a string from/to the user buffer. If the kernel | |
1807 | * buffer provided is not large enough to hold the string, the | |
1808 | * string is truncated. The copied string is %NULL-terminated. | |
1809 | * If the string is being read by the user process, it is copied | |
1810 | * and a newline '\n' is added. It is truncated if the buffer is | |
1811 | * not large enough. | |
1812 | * | |
1813 | * Returns 0 on success. | |
1814 | */ | |
1815 | int proc_dostring(struct ctl_table *table, int write, | |
1816 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
1817 | { | |
1818 | if (write && *ppos && sysctl_writes_strict == SYSCTL_WRITES_WARN) | |
1819 | warn_sysctl_write(table); | |
1820 | ||
1821 | return _proc_do_string((char *)(table->data), table->maxlen, write, | |
1822 | (char __user *)buffer, lenp, ppos); | |
1823 | } | |
1824 | ||
1825 | static size_t proc_skip_spaces(char **buf) | |
1826 | { | |
1827 | size_t ret; | |
1828 | char *tmp = skip_spaces(*buf); | |
1829 | ret = tmp - *buf; | |
1830 | *buf = tmp; | |
1831 | return ret; | |
1832 | } | |
1833 | ||
1834 | static void proc_skip_char(char **buf, size_t *size, const char v) | |
1835 | { | |
1836 | while (*size) { | |
1837 | if (**buf != v) | |
1838 | break; | |
1839 | (*size)--; | |
1840 | (*buf)++; | |
1841 | } | |
1842 | } | |
1843 | ||
1844 | #define TMPBUFLEN 22 | |
1845 | /** | |
1846 | * proc_get_long - reads an ASCII formatted integer from a user buffer | |
1847 | * | |
1848 | * @buf: a kernel buffer | |
1849 | * @size: size of the kernel buffer | |
1850 | * @val: this is where the number will be stored | |
1851 | * @neg: set to %TRUE if number is negative | |
1852 | * @perm_tr: a vector which contains the allowed trailers | |
1853 | * @perm_tr_len: size of the perm_tr vector | |
1854 | * @tr: pointer to store the trailer character | |
1855 | * | |
1856 | * In case of success %0 is returned and @buf and @size are updated with | |
1857 | * the amount of bytes read. If @tr is non-NULL and a trailing | |
1858 | * character exists (size is non-zero after returning from this | |
1859 | * function), @tr is updated with the trailing character. | |
1860 | */ | |
1861 | static int proc_get_long(char **buf, size_t *size, | |
1862 | unsigned long *val, bool *neg, | |
1863 | const char *perm_tr, unsigned perm_tr_len, char *tr) | |
1864 | { | |
1865 | int len; | |
1866 | char *p, tmp[TMPBUFLEN]; | |
1867 | ||
1868 | if (!*size) | |
1869 | return -EINVAL; | |
1870 | ||
1871 | len = *size; | |
1872 | if (len > TMPBUFLEN - 1) | |
1873 | len = TMPBUFLEN - 1; | |
1874 | ||
1875 | memcpy(tmp, *buf, len); | |
1876 | ||
1877 | tmp[len] = 0; | |
1878 | p = tmp; | |
1879 | if (*p == '-' && *size > 1) { | |
1880 | *neg = true; | |
1881 | p++; | |
1882 | } else | |
1883 | *neg = false; | |
1884 | if (!isdigit(*p)) | |
1885 | return -EINVAL; | |
1886 | ||
1887 | *val = simple_strtoul(p, &p, 0); | |
1888 | ||
1889 | len = p - tmp; | |
1890 | ||
1891 | /* We don't know if the next char is whitespace thus we may accept | |
1892 | * invalid integers (e.g. 1234...a) or two integers instead of one | |
1893 | * (e.g. 123...1). So lets not allow such large numbers. */ | |
1894 | if (len == TMPBUFLEN - 1) | |
1895 | return -EINVAL; | |
1896 | ||
1897 | if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len)) | |
1898 | return -EINVAL; | |
1899 | ||
1900 | if (tr && (len < *size)) | |
1901 | *tr = *p; | |
1902 | ||
1903 | *buf += len; | |
1904 | *size -= len; | |
1905 | ||
1906 | return 0; | |
1907 | } | |
1908 | ||
1909 | /** | |
1910 | * proc_put_long - converts an integer to a decimal ASCII formatted string | |
1911 | * | |
1912 | * @buf: the user buffer | |
1913 | * @size: the size of the user buffer | |
1914 | * @val: the integer to be converted | |
1915 | * @neg: sign of the number, %TRUE for negative | |
1916 | * | |
1917 | * In case of success %0 is returned and @buf and @size are updated with | |
1918 | * the amount of bytes written. | |
1919 | */ | |
1920 | static int proc_put_long(void __user **buf, size_t *size, unsigned long val, | |
1921 | bool neg) | |
1922 | { | |
1923 | int len; | |
1924 | char tmp[TMPBUFLEN], *p = tmp; | |
1925 | ||
1926 | sprintf(p, "%s%lu", neg ? "-" : "", val); | |
1927 | len = strlen(tmp); | |
1928 | if (len > *size) | |
1929 | len = *size; | |
1930 | if (copy_to_user(*buf, tmp, len)) | |
1931 | return -EFAULT; | |
1932 | *size -= len; | |
1933 | *buf += len; | |
1934 | return 0; | |
1935 | } | |
1936 | #undef TMPBUFLEN | |
1937 | ||
1938 | static int proc_put_char(void __user **buf, size_t *size, char c) | |
1939 | { | |
1940 | if (*size) { | |
1941 | char __user **buffer = (char __user **)buf; | |
1942 | if (put_user(c, *buffer)) | |
1943 | return -EFAULT; | |
1944 | (*size)--, (*buffer)++; | |
1945 | *buf = *buffer; | |
1946 | } | |
1947 | return 0; | |
1948 | } | |
1949 | ||
1950 | static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp, | |
1951 | int *valp, | |
1952 | int write, void *data) | |
1953 | { | |
1954 | if (write) { | |
1955 | *valp = *negp ? -*lvalp : *lvalp; | |
1956 | } else { | |
1957 | int val = *valp; | |
1958 | if (val < 0) { | |
1959 | *negp = true; | |
1960 | *lvalp = (unsigned long)-val; | |
1961 | } else { | |
1962 | *negp = false; | |
1963 | *lvalp = (unsigned long)val; | |
1964 | } | |
1965 | } | |
1966 | return 0; | |
1967 | } | |
1968 | ||
1969 | static const char proc_wspace_sep[] = { ' ', '\t', '\n' }; | |
1970 | ||
1971 | static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table, | |
1972 | int write, void __user *buffer, | |
1973 | size_t *lenp, loff_t *ppos, | |
1974 | int (*conv)(bool *negp, unsigned long *lvalp, int *valp, | |
1975 | int write, void *data), | |
1976 | void *data) | |
1977 | { | |
1978 | int *i, vleft, first = 1, err = 0; | |
1979 | unsigned long page = 0; | |
1980 | size_t left; | |
1981 | char *kbuf; | |
1982 | ||
1983 | if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) { | |
1984 | *lenp = 0; | |
1985 | return 0; | |
1986 | } | |
1987 | ||
1988 | i = (int *) tbl_data; | |
1989 | vleft = table->maxlen / sizeof(*i); | |
1990 | left = *lenp; | |
1991 | ||
1992 | if (!conv) | |
1993 | conv = do_proc_dointvec_conv; | |
1994 | ||
1995 | if (write) { | |
1996 | if (*ppos) { | |
1997 | switch (sysctl_writes_strict) { | |
1998 | case SYSCTL_WRITES_STRICT: | |
1999 | goto out; | |
2000 | case SYSCTL_WRITES_WARN: | |
2001 | warn_sysctl_write(table); | |
2002 | break; | |
2003 | default: | |
2004 | break; | |
2005 | } | |
2006 | } | |
2007 | ||
2008 | if (left > PAGE_SIZE - 1) | |
2009 | left = PAGE_SIZE - 1; | |
2010 | page = __get_free_page(GFP_TEMPORARY); | |
2011 | kbuf = (char *) page; | |
2012 | if (!kbuf) | |
2013 | return -ENOMEM; | |
2014 | if (copy_from_user(kbuf, buffer, left)) { | |
2015 | err = -EFAULT; | |
2016 | goto free; | |
2017 | } | |
2018 | kbuf[left] = 0; | |
2019 | } | |
2020 | ||
2021 | for (; left && vleft--; i++, first=0) { | |
2022 | unsigned long lval; | |
2023 | bool neg; | |
2024 | ||
2025 | if (write) { | |
2026 | left -= proc_skip_spaces(&kbuf); | |
2027 | ||
2028 | if (!left) | |
2029 | break; | |
2030 | err = proc_get_long(&kbuf, &left, &lval, &neg, | |
2031 | proc_wspace_sep, | |
2032 | sizeof(proc_wspace_sep), NULL); | |
2033 | if (err) | |
2034 | break; | |
2035 | if (conv(&neg, &lval, i, 1, data)) { | |
2036 | err = -EINVAL; | |
2037 | break; | |
2038 | } | |
2039 | } else { | |
2040 | if (conv(&neg, &lval, i, 0, data)) { | |
2041 | err = -EINVAL; | |
2042 | break; | |
2043 | } | |
2044 | if (!first) | |
2045 | err = proc_put_char(&buffer, &left, '\t'); | |
2046 | if (err) | |
2047 | break; | |
2048 | err = proc_put_long(&buffer, &left, lval, neg); | |
2049 | if (err) | |
2050 | break; | |
2051 | } | |
2052 | } | |
2053 | ||
2054 | if (!write && !first && left && !err) | |
2055 | err = proc_put_char(&buffer, &left, '\n'); | |
2056 | if (write && !err && left) | |
2057 | left -= proc_skip_spaces(&kbuf); | |
2058 | free: | |
2059 | if (write) { | |
2060 | free_page(page); | |
2061 | if (first) | |
2062 | return err ? : -EINVAL; | |
2063 | } | |
2064 | *lenp -= left; | |
2065 | out: | |
2066 | *ppos += *lenp; | |
2067 | return err; | |
2068 | } | |
2069 | ||
2070 | static int do_proc_dointvec(struct ctl_table *table, int write, | |
2071 | void __user *buffer, size_t *lenp, loff_t *ppos, | |
2072 | int (*conv)(bool *negp, unsigned long *lvalp, int *valp, | |
2073 | int write, void *data), | |
2074 | void *data) | |
2075 | { | |
2076 | return __do_proc_dointvec(table->data, table, write, | |
2077 | buffer, lenp, ppos, conv, data); | |
2078 | } | |
2079 | ||
2080 | /** | |
2081 | * proc_dointvec - read a vector of integers | |
2082 | * @table: the sysctl table | |
2083 | * @write: %TRUE if this is a write to the sysctl file | |
2084 | * @buffer: the user buffer | |
2085 | * @lenp: the size of the user buffer | |
2086 | * @ppos: file position | |
2087 | * | |
2088 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer | |
2089 | * values from/to the user buffer, treated as an ASCII string. | |
2090 | * | |
2091 | * Returns 0 on success. | |
2092 | */ | |
2093 | int proc_dointvec(struct ctl_table *table, int write, | |
2094 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2095 | { | |
2096 | return do_proc_dointvec(table,write,buffer,lenp,ppos, | |
2097 | NULL,NULL); | |
2098 | } | |
2099 | ||
2100 | /* | |
2101 | * Taint values can only be increased | |
2102 | * This means we can safely use a temporary. | |
2103 | */ | |
2104 | static int proc_taint(struct ctl_table *table, int write, | |
2105 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2106 | { | |
2107 | struct ctl_table t; | |
2108 | unsigned long tmptaint = get_taint(); | |
2109 | int err; | |
2110 | ||
2111 | if (write && !capable(CAP_SYS_ADMIN)) | |
2112 | return -EPERM; | |
2113 | ||
2114 | t = *table; | |
2115 | t.data = &tmptaint; | |
2116 | err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos); | |
2117 | if (err < 0) | |
2118 | return err; | |
2119 | ||
2120 | if (write) { | |
2121 | /* | |
2122 | * Poor man's atomic or. Not worth adding a primitive | |
2123 | * to everyone's atomic.h for this | |
2124 | */ | |
2125 | int i; | |
2126 | for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) { | |
2127 | if ((tmptaint >> i) & 1) | |
2128 | add_taint(i, LOCKDEP_STILL_OK); | |
2129 | } | |
2130 | } | |
2131 | ||
2132 | return err; | |
2133 | } | |
2134 | ||
2135 | #ifdef CONFIG_PRINTK | |
2136 | static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write, | |
2137 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2138 | { | |
2139 | if (write && !capable(CAP_SYS_ADMIN)) | |
2140 | return -EPERM; | |
2141 | ||
2142 | return proc_dointvec_minmax(table, write, buffer, lenp, ppos); | |
2143 | } | |
2144 | #endif | |
2145 | ||
2146 | struct do_proc_dointvec_minmax_conv_param { | |
2147 | int *min; | |
2148 | int *max; | |
2149 | }; | |
2150 | ||
2151 | static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp, | |
2152 | int *valp, | |
2153 | int write, void *data) | |
2154 | { | |
2155 | struct do_proc_dointvec_minmax_conv_param *param = data; | |
2156 | if (write) { | |
2157 | int val = *negp ? -*lvalp : *lvalp; | |
2158 | if ((param->min && *param->min > val) || | |
2159 | (param->max && *param->max < val)) | |
2160 | return -EINVAL; | |
2161 | *valp = val; | |
2162 | } else { | |
2163 | int val = *valp; | |
2164 | if (val < 0) { | |
2165 | *negp = true; | |
2166 | *lvalp = (unsigned long)-val; | |
2167 | } else { | |
2168 | *negp = false; | |
2169 | *lvalp = (unsigned long)val; | |
2170 | } | |
2171 | } | |
2172 | return 0; | |
2173 | } | |
2174 | ||
2175 | /** | |
2176 | * proc_dointvec_minmax - read a vector of integers with min/max values | |
2177 | * @table: the sysctl table | |
2178 | * @write: %TRUE if this is a write to the sysctl file | |
2179 | * @buffer: the user buffer | |
2180 | * @lenp: the size of the user buffer | |
2181 | * @ppos: file position | |
2182 | * | |
2183 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer | |
2184 | * values from/to the user buffer, treated as an ASCII string. | |
2185 | * | |
2186 | * This routine will ensure the values are within the range specified by | |
2187 | * table->extra1 (min) and table->extra2 (max). | |
2188 | * | |
2189 | * Returns 0 on success. | |
2190 | */ | |
2191 | int proc_dointvec_minmax(struct ctl_table *table, int write, | |
2192 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2193 | { | |
2194 | struct do_proc_dointvec_minmax_conv_param param = { | |
2195 | .min = (int *) table->extra1, | |
2196 | .max = (int *) table->extra2, | |
2197 | }; | |
2198 | return do_proc_dointvec(table, write, buffer, lenp, ppos, | |
2199 | do_proc_dointvec_minmax_conv, ¶m); | |
2200 | } | |
2201 | ||
2202 | static void validate_coredump_safety(void) | |
2203 | { | |
2204 | #ifdef CONFIG_COREDUMP | |
2205 | if (suid_dumpable == SUID_DUMP_ROOT && | |
2206 | core_pattern[0] != '/' && core_pattern[0] != '|') { | |
2207 | printk(KERN_WARNING "Unsafe core_pattern used with "\ | |
2208 | "suid_dumpable=2. Pipe handler or fully qualified "\ | |
2209 | "core dump path required.\n"); | |
2210 | } | |
2211 | #endif | |
2212 | } | |
2213 | ||
2214 | static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write, | |
2215 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2216 | { | |
2217 | int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos); | |
2218 | if (!error) | |
2219 | validate_coredump_safety(); | |
2220 | return error; | |
2221 | } | |
2222 | ||
2223 | #ifdef CONFIG_COREDUMP | |
2224 | static int proc_dostring_coredump(struct ctl_table *table, int write, | |
2225 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2226 | { | |
2227 | int error = proc_dostring(table, write, buffer, lenp, ppos); | |
2228 | if (!error) | |
2229 | validate_coredump_safety(); | |
2230 | return error; | |
2231 | } | |
2232 | #endif | |
2233 | ||
2234 | static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write, | |
2235 | void __user *buffer, | |
2236 | size_t *lenp, loff_t *ppos, | |
2237 | unsigned long convmul, | |
2238 | unsigned long convdiv) | |
2239 | { | |
2240 | unsigned long *i, *min, *max; | |
2241 | int vleft, first = 1, err = 0; | |
2242 | unsigned long page = 0; | |
2243 | size_t left; | |
2244 | char *kbuf; | |
2245 | ||
2246 | if (!data || !table->maxlen || !*lenp || (*ppos && !write)) { | |
2247 | *lenp = 0; | |
2248 | return 0; | |
2249 | } | |
2250 | ||
2251 | i = (unsigned long *) data; | |
2252 | min = (unsigned long *) table->extra1; | |
2253 | max = (unsigned long *) table->extra2; | |
2254 | vleft = table->maxlen / sizeof(unsigned long); | |
2255 | left = *lenp; | |
2256 | ||
2257 | if (write) { | |
2258 | if (*ppos) { | |
2259 | switch (sysctl_writes_strict) { | |
2260 | case SYSCTL_WRITES_STRICT: | |
2261 | goto out; | |
2262 | case SYSCTL_WRITES_WARN: | |
2263 | warn_sysctl_write(table); | |
2264 | break; | |
2265 | default: | |
2266 | break; | |
2267 | } | |
2268 | } | |
2269 | ||
2270 | if (left > PAGE_SIZE - 1) | |
2271 | left = PAGE_SIZE - 1; | |
2272 | page = __get_free_page(GFP_TEMPORARY); | |
2273 | kbuf = (char *) page; | |
2274 | if (!kbuf) | |
2275 | return -ENOMEM; | |
2276 | if (copy_from_user(kbuf, buffer, left)) { | |
2277 | err = -EFAULT; | |
2278 | goto free; | |
2279 | } | |
2280 | kbuf[left] = 0; | |
2281 | } | |
2282 | ||
2283 | for (; left && vleft--; i++, first = 0) { | |
2284 | unsigned long val; | |
2285 | ||
2286 | if (write) { | |
2287 | bool neg; | |
2288 | ||
2289 | left -= proc_skip_spaces(&kbuf); | |
2290 | ||
2291 | err = proc_get_long(&kbuf, &left, &val, &neg, | |
2292 | proc_wspace_sep, | |
2293 | sizeof(proc_wspace_sep), NULL); | |
2294 | if (err) | |
2295 | break; | |
2296 | if (neg) | |
2297 | continue; | |
2298 | if ((min && val < *min) || (max && val > *max)) | |
2299 | continue; | |
2300 | *i = val; | |
2301 | } else { | |
2302 | val = convdiv * (*i) / convmul; | |
2303 | if (!first) { | |
2304 | err = proc_put_char(&buffer, &left, '\t'); | |
2305 | if (err) | |
2306 | break; | |
2307 | } | |
2308 | err = proc_put_long(&buffer, &left, val, false); | |
2309 | if (err) | |
2310 | break; | |
2311 | } | |
2312 | } | |
2313 | ||
2314 | if (!write && !first && left && !err) | |
2315 | err = proc_put_char(&buffer, &left, '\n'); | |
2316 | if (write && !err) | |
2317 | left -= proc_skip_spaces(&kbuf); | |
2318 | free: | |
2319 | if (write) { | |
2320 | free_page(page); | |
2321 | if (first) | |
2322 | return err ? : -EINVAL; | |
2323 | } | |
2324 | *lenp -= left; | |
2325 | out: | |
2326 | *ppos += *lenp; | |
2327 | return err; | |
2328 | } | |
2329 | ||
2330 | static int do_proc_doulongvec_minmax(struct ctl_table *table, int write, | |
2331 | void __user *buffer, | |
2332 | size_t *lenp, loff_t *ppos, | |
2333 | unsigned long convmul, | |
2334 | unsigned long convdiv) | |
2335 | { | |
2336 | return __do_proc_doulongvec_minmax(table->data, table, write, | |
2337 | buffer, lenp, ppos, convmul, convdiv); | |
2338 | } | |
2339 | ||
2340 | /** | |
2341 | * proc_doulongvec_minmax - read a vector of long integers with min/max values | |
2342 | * @table: the sysctl table | |
2343 | * @write: %TRUE if this is a write to the sysctl file | |
2344 | * @buffer: the user buffer | |
2345 | * @lenp: the size of the user buffer | |
2346 | * @ppos: file position | |
2347 | * | |
2348 | * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long | |
2349 | * values from/to the user buffer, treated as an ASCII string. | |
2350 | * | |
2351 | * This routine will ensure the values are within the range specified by | |
2352 | * table->extra1 (min) and table->extra2 (max). | |
2353 | * | |
2354 | * Returns 0 on success. | |
2355 | */ | |
2356 | int proc_doulongvec_minmax(struct ctl_table *table, int write, | |
2357 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2358 | { | |
2359 | return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l); | |
2360 | } | |
2361 | ||
2362 | /** | |
2363 | * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values | |
2364 | * @table: the sysctl table | |
2365 | * @write: %TRUE if this is a write to the sysctl file | |
2366 | * @buffer: the user buffer | |
2367 | * @lenp: the size of the user buffer | |
2368 | * @ppos: file position | |
2369 | * | |
2370 | * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long | |
2371 | * values from/to the user buffer, treated as an ASCII string. The values | |
2372 | * are treated as milliseconds, and converted to jiffies when they are stored. | |
2373 | * | |
2374 | * This routine will ensure the values are within the range specified by | |
2375 | * table->extra1 (min) and table->extra2 (max). | |
2376 | * | |
2377 | * Returns 0 on success. | |
2378 | */ | |
2379 | int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, | |
2380 | void __user *buffer, | |
2381 | size_t *lenp, loff_t *ppos) | |
2382 | { | |
2383 | return do_proc_doulongvec_minmax(table, write, buffer, | |
2384 | lenp, ppos, HZ, 1000l); | |
2385 | } | |
2386 | ||
2387 | ||
2388 | static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp, | |
2389 | int *valp, | |
2390 | int write, void *data) | |
2391 | { | |
2392 | if (write) { | |
2393 | if (*lvalp > LONG_MAX / HZ) | |
2394 | return 1; | |
2395 | *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ); | |
2396 | } else { | |
2397 | int val = *valp; | |
2398 | unsigned long lval; | |
2399 | if (val < 0) { | |
2400 | *negp = true; | |
2401 | lval = (unsigned long)-val; | |
2402 | } else { | |
2403 | *negp = false; | |
2404 | lval = (unsigned long)val; | |
2405 | } | |
2406 | *lvalp = lval / HZ; | |
2407 | } | |
2408 | return 0; | |
2409 | } | |
2410 | ||
2411 | static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp, | |
2412 | int *valp, | |
2413 | int write, void *data) | |
2414 | { | |
2415 | if (write) { | |
2416 | if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ) | |
2417 | return 1; | |
2418 | *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp); | |
2419 | } else { | |
2420 | int val = *valp; | |
2421 | unsigned long lval; | |
2422 | if (val < 0) { | |
2423 | *negp = true; | |
2424 | lval = (unsigned long)-val; | |
2425 | } else { | |
2426 | *negp = false; | |
2427 | lval = (unsigned long)val; | |
2428 | } | |
2429 | *lvalp = jiffies_to_clock_t(lval); | |
2430 | } | |
2431 | return 0; | |
2432 | } | |
2433 | ||
2434 | static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp, | |
2435 | int *valp, | |
2436 | int write, void *data) | |
2437 | { | |
2438 | if (write) { | |
2439 | unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp); | |
2440 | ||
2441 | if (jif > INT_MAX) | |
2442 | return 1; | |
2443 | *valp = (int)jif; | |
2444 | } else { | |
2445 | int val = *valp; | |
2446 | unsigned long lval; | |
2447 | if (val < 0) { | |
2448 | *negp = true; | |
2449 | lval = (unsigned long)-val; | |
2450 | } else { | |
2451 | *negp = false; | |
2452 | lval = (unsigned long)val; | |
2453 | } | |
2454 | *lvalp = jiffies_to_msecs(lval); | |
2455 | } | |
2456 | return 0; | |
2457 | } | |
2458 | ||
2459 | /** | |
2460 | * proc_dointvec_jiffies - read a vector of integers as seconds | |
2461 | * @table: the sysctl table | |
2462 | * @write: %TRUE if this is a write to the sysctl file | |
2463 | * @buffer: the user buffer | |
2464 | * @lenp: the size of the user buffer | |
2465 | * @ppos: file position | |
2466 | * | |
2467 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer | |
2468 | * values from/to the user buffer, treated as an ASCII string. | |
2469 | * The values read are assumed to be in seconds, and are converted into | |
2470 | * jiffies. | |
2471 | * | |
2472 | * Returns 0 on success. | |
2473 | */ | |
2474 | int proc_dointvec_jiffies(struct ctl_table *table, int write, | |
2475 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2476 | { | |
2477 | return do_proc_dointvec(table,write,buffer,lenp,ppos, | |
2478 | do_proc_dointvec_jiffies_conv,NULL); | |
2479 | } | |
2480 | ||
2481 | /** | |
2482 | * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds | |
2483 | * @table: the sysctl table | |
2484 | * @write: %TRUE if this is a write to the sysctl file | |
2485 | * @buffer: the user buffer | |
2486 | * @lenp: the size of the user buffer | |
2487 | * @ppos: pointer to the file position | |
2488 | * | |
2489 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer | |
2490 | * values from/to the user buffer, treated as an ASCII string. | |
2491 | * The values read are assumed to be in 1/USER_HZ seconds, and | |
2492 | * are converted into jiffies. | |
2493 | * | |
2494 | * Returns 0 on success. | |
2495 | */ | |
2496 | int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, | |
2497 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2498 | { | |
2499 | return do_proc_dointvec(table,write,buffer,lenp,ppos, | |
2500 | do_proc_dointvec_userhz_jiffies_conv,NULL); | |
2501 | } | |
2502 | ||
2503 | /** | |
2504 | * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds | |
2505 | * @table: the sysctl table | |
2506 | * @write: %TRUE if this is a write to the sysctl file | |
2507 | * @buffer: the user buffer | |
2508 | * @lenp: the size of the user buffer | |
2509 | * @ppos: file position | |
2510 | * @ppos: the current position in the file | |
2511 | * | |
2512 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer | |
2513 | * values from/to the user buffer, treated as an ASCII string. | |
2514 | * The values read are assumed to be in 1/1000 seconds, and | |
2515 | * are converted into jiffies. | |
2516 | * | |
2517 | * Returns 0 on success. | |
2518 | */ | |
2519 | int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, | |
2520 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2521 | { | |
2522 | return do_proc_dointvec(table, write, buffer, lenp, ppos, | |
2523 | do_proc_dointvec_ms_jiffies_conv, NULL); | |
2524 | } | |
2525 | ||
2526 | static int proc_do_cad_pid(struct ctl_table *table, int write, | |
2527 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2528 | { | |
2529 | struct pid *new_pid; | |
2530 | pid_t tmp; | |
2531 | int r; | |
2532 | ||
2533 | tmp = pid_vnr(cad_pid); | |
2534 | ||
2535 | r = __do_proc_dointvec(&tmp, table, write, buffer, | |
2536 | lenp, ppos, NULL, NULL); | |
2537 | if (r || !write) | |
2538 | return r; | |
2539 | ||
2540 | new_pid = find_get_pid(tmp); | |
2541 | if (!new_pid) | |
2542 | return -ESRCH; | |
2543 | ||
2544 | put_pid(xchg(&cad_pid, new_pid)); | |
2545 | return 0; | |
2546 | } | |
2547 | ||
2548 | /** | |
2549 | * proc_do_large_bitmap - read/write from/to a large bitmap | |
2550 | * @table: the sysctl table | |
2551 | * @write: %TRUE if this is a write to the sysctl file | |
2552 | * @buffer: the user buffer | |
2553 | * @lenp: the size of the user buffer | |
2554 | * @ppos: file position | |
2555 | * | |
2556 | * The bitmap is stored at table->data and the bitmap length (in bits) | |
2557 | * in table->maxlen. | |
2558 | * | |
2559 | * We use a range comma separated format (e.g. 1,3-4,10-10) so that | |
2560 | * large bitmaps may be represented in a compact manner. Writing into | |
2561 | * the file will clear the bitmap then update it with the given input. | |
2562 | * | |
2563 | * Returns 0 on success. | |
2564 | */ | |
2565 | int proc_do_large_bitmap(struct ctl_table *table, int write, | |
2566 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2567 | { | |
2568 | int err = 0; | |
2569 | bool first = 1; | |
2570 | size_t left = *lenp; | |
2571 | unsigned long bitmap_len = table->maxlen; | |
2572 | unsigned long *bitmap = *(unsigned long **) table->data; | |
2573 | unsigned long *tmp_bitmap = NULL; | |
2574 | char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c; | |
2575 | ||
2576 | if (!bitmap || !bitmap_len || !left || (*ppos && !write)) { | |
2577 | *lenp = 0; | |
2578 | return 0; | |
2579 | } | |
2580 | ||
2581 | if (write) { | |
2582 | unsigned long page = 0; | |
2583 | char *kbuf; | |
2584 | ||
2585 | if (left > PAGE_SIZE - 1) | |
2586 | left = PAGE_SIZE - 1; | |
2587 | ||
2588 | page = __get_free_page(GFP_TEMPORARY); | |
2589 | kbuf = (char *) page; | |
2590 | if (!kbuf) | |
2591 | return -ENOMEM; | |
2592 | if (copy_from_user(kbuf, buffer, left)) { | |
2593 | free_page(page); | |
2594 | return -EFAULT; | |
2595 | } | |
2596 | kbuf[left] = 0; | |
2597 | ||
2598 | tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long), | |
2599 | GFP_KERNEL); | |
2600 | if (!tmp_bitmap) { | |
2601 | free_page(page); | |
2602 | return -ENOMEM; | |
2603 | } | |
2604 | proc_skip_char(&kbuf, &left, '\n'); | |
2605 | while (!err && left) { | |
2606 | unsigned long val_a, val_b; | |
2607 | bool neg; | |
2608 | ||
2609 | err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a, | |
2610 | sizeof(tr_a), &c); | |
2611 | if (err) | |
2612 | break; | |
2613 | if (val_a >= bitmap_len || neg) { | |
2614 | err = -EINVAL; | |
2615 | break; | |
2616 | } | |
2617 | ||
2618 | val_b = val_a; | |
2619 | if (left) { | |
2620 | kbuf++; | |
2621 | left--; | |
2622 | } | |
2623 | ||
2624 | if (c == '-') { | |
2625 | err = proc_get_long(&kbuf, &left, &val_b, | |
2626 | &neg, tr_b, sizeof(tr_b), | |
2627 | &c); | |
2628 | if (err) | |
2629 | break; | |
2630 | if (val_b >= bitmap_len || neg || | |
2631 | val_a > val_b) { | |
2632 | err = -EINVAL; | |
2633 | break; | |
2634 | } | |
2635 | if (left) { | |
2636 | kbuf++; | |
2637 | left--; | |
2638 | } | |
2639 | } | |
2640 | ||
2641 | bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1); | |
2642 | first = 0; | |
2643 | proc_skip_char(&kbuf, &left, '\n'); | |
2644 | } | |
2645 | free_page(page); | |
2646 | } else { | |
2647 | unsigned long bit_a, bit_b = 0; | |
2648 | ||
2649 | while (left) { | |
2650 | bit_a = find_next_bit(bitmap, bitmap_len, bit_b); | |
2651 | if (bit_a >= bitmap_len) | |
2652 | break; | |
2653 | bit_b = find_next_zero_bit(bitmap, bitmap_len, | |
2654 | bit_a + 1) - 1; | |
2655 | ||
2656 | if (!first) { | |
2657 | err = proc_put_char(&buffer, &left, ','); | |
2658 | if (err) | |
2659 | break; | |
2660 | } | |
2661 | err = proc_put_long(&buffer, &left, bit_a, false); | |
2662 | if (err) | |
2663 | break; | |
2664 | if (bit_a != bit_b) { | |
2665 | err = proc_put_char(&buffer, &left, '-'); | |
2666 | if (err) | |
2667 | break; | |
2668 | err = proc_put_long(&buffer, &left, bit_b, false); | |
2669 | if (err) | |
2670 | break; | |
2671 | } | |
2672 | ||
2673 | first = 0; bit_b++; | |
2674 | } | |
2675 | if (!err) | |
2676 | err = proc_put_char(&buffer, &left, '\n'); | |
2677 | } | |
2678 | ||
2679 | if (!err) { | |
2680 | if (write) { | |
2681 | if (*ppos) | |
2682 | bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len); | |
2683 | else | |
2684 | bitmap_copy(bitmap, tmp_bitmap, bitmap_len); | |
2685 | } | |
2686 | kfree(tmp_bitmap); | |
2687 | *lenp -= left; | |
2688 | *ppos += *lenp; | |
2689 | return 0; | |
2690 | } else { | |
2691 | kfree(tmp_bitmap); | |
2692 | return err; | |
2693 | } | |
2694 | } | |
2695 | ||
2696 | #else /* CONFIG_PROC_SYSCTL */ | |
2697 | ||
2698 | int proc_dostring(struct ctl_table *table, int write, | |
2699 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2700 | { | |
2701 | return -ENOSYS; | |
2702 | } | |
2703 | ||
2704 | int proc_dointvec(struct ctl_table *table, int write, | |
2705 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2706 | { | |
2707 | return -ENOSYS; | |
2708 | } | |
2709 | ||
2710 | int proc_dointvec_minmax(struct ctl_table *table, int write, | |
2711 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2712 | { | |
2713 | return -ENOSYS; | |
2714 | } | |
2715 | ||
2716 | int proc_dointvec_jiffies(struct ctl_table *table, int write, | |
2717 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2718 | { | |
2719 | return -ENOSYS; | |
2720 | } | |
2721 | ||
2722 | int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, | |
2723 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2724 | { | |
2725 | return -ENOSYS; | |
2726 | } | |
2727 | ||
2728 | int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, | |
2729 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2730 | { | |
2731 | return -ENOSYS; | |
2732 | } | |
2733 | ||
2734 | int proc_doulongvec_minmax(struct ctl_table *table, int write, | |
2735 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2736 | { | |
2737 | return -ENOSYS; | |
2738 | } | |
2739 | ||
2740 | int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, | |
2741 | void __user *buffer, | |
2742 | size_t *lenp, loff_t *ppos) | |
2743 | { | |
2744 | return -ENOSYS; | |
2745 | } | |
2746 | ||
2747 | ||
2748 | #endif /* CONFIG_PROC_SYSCTL */ | |
2749 | ||
2750 | /* | |
2751 | * No sense putting this after each symbol definition, twice, | |
2752 | * exception granted :-) | |
2753 | */ | |
2754 | EXPORT_SYMBOL(proc_dointvec); | |
2755 | EXPORT_SYMBOL(proc_dointvec_jiffies); | |
2756 | EXPORT_SYMBOL(proc_dointvec_minmax); | |
2757 | EXPORT_SYMBOL(proc_dointvec_userhz_jiffies); | |
2758 | EXPORT_SYMBOL(proc_dointvec_ms_jiffies); | |
2759 | EXPORT_SYMBOL(proc_dostring); | |
2760 | EXPORT_SYMBOL(proc_doulongvec_minmax); | |
2761 | EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax); |