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