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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/aio.h> | |
23 | #include <linux/mm.h> | |
24 | #include <linux/swap.h> | |
25 | #include <linux/slab.h> | |
26 | #include <linux/sysctl.h> | |
27 | #include <linux/bitmap.h> | |
28 | #include <linux/signal.h> | |
29 | #include <linux/printk.h> | |
30 | #include <linux/proc_fs.h> | |
31 | #include <linux/security.h> | |
32 | #include <linux/ctype.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/sched/coredump.h> | |
66 | #include <linux/kexec.h> | |
67 | #include <linux/bpf.h> | |
68 | #include <linux/mount.h> | |
69 | ||
70 | #include <linux/uaccess.h> | |
71 | #include <asm/processor.h> | |
72 | ||
73 | #ifdef CONFIG_X86 | |
74 | #include <asm/nmi.h> | |
75 | #include <asm/stacktrace.h> | |
76 | #include <asm/io.h> | |
77 | #endif | |
78 | #ifdef CONFIG_SPARC | |
79 | #include <asm/setup.h> | |
80 | #endif | |
81 | #ifdef CONFIG_BSD_PROCESS_ACCT | |
82 | #include <linux/acct.h> | |
83 | #endif | |
84 | #ifdef CONFIG_RT_MUTEXES | |
85 | #include <linux/rtmutex.h> | |
86 | #endif | |
87 | #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT) | |
88 | #include <linux/lockdep.h> | |
89 | #endif | |
90 | #ifdef CONFIG_CHR_DEV_SG | |
91 | #include <scsi/sg.h> | |
92 | #endif | |
93 | #ifdef CONFIG_STACKLEAK_RUNTIME_DISABLE | |
94 | #include <linux/stackleak.h> | |
95 | #endif | |
96 | #ifdef CONFIG_LOCKUP_DETECTOR | |
97 | #include <linux/nmi.h> | |
98 | #endif | |
99 | ||
100 | #if defined(CONFIG_SYSCTL) | |
101 | ||
102 | /* External variables not in a header file. */ | |
103 | extern int suid_dumpable; | |
104 | #ifdef CONFIG_COREDUMP | |
105 | extern int core_uses_pid; | |
106 | extern char core_pattern[]; | |
107 | extern unsigned int core_pipe_limit; | |
108 | #endif | |
109 | extern int pid_max; | |
110 | extern int pid_max_min, pid_max_max; | |
111 | extern int percpu_pagelist_fraction; | |
112 | extern int latencytop_enabled; | |
113 | extern unsigned int sysctl_nr_open_min, sysctl_nr_open_max; | |
114 | #ifndef CONFIG_MMU | |
115 | extern int sysctl_nr_trim_pages; | |
116 | #endif | |
117 | ||
118 | /* Constants used for minimum and maximum */ | |
119 | #ifdef CONFIG_LOCKUP_DETECTOR | |
120 | static int sixty = 60; | |
121 | #endif | |
122 | ||
123 | static int __maybe_unused neg_one = -1; | |
124 | ||
125 | static int zero; | |
126 | static int __maybe_unused one = 1; | |
127 | static int __maybe_unused two = 2; | |
128 | static int __maybe_unused four = 4; | |
129 | static unsigned long one_ul = 1; | |
130 | static int one_hundred = 100; | |
131 | static int one_thousand = 1000; | |
132 | #ifdef CONFIG_PRINTK | |
133 | static int ten_thousand = 10000; | |
134 | #endif | |
135 | #ifdef CONFIG_PERF_EVENTS | |
136 | static int six_hundred_forty_kb = 640 * 1024; | |
137 | #endif | |
138 | ||
139 | /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */ | |
140 | static unsigned long dirty_bytes_min = 2 * PAGE_SIZE; | |
141 | ||
142 | /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */ | |
143 | static int maxolduid = 65535; | |
144 | static int minolduid; | |
145 | ||
146 | static int ngroups_max = NGROUPS_MAX; | |
147 | static const int cap_last_cap = CAP_LAST_CAP; | |
148 | ||
149 | /* | |
150 | * This is needed for proc_doulongvec_minmax of sysctl_hung_task_timeout_secs | |
151 | * and hung_task_check_interval_secs | |
152 | */ | |
153 | #ifdef CONFIG_DETECT_HUNG_TASK | |
154 | static unsigned long hung_task_timeout_max = (LONG_MAX/HZ); | |
155 | #endif | |
156 | ||
157 | #ifdef CONFIG_INOTIFY_USER | |
158 | #include <linux/inotify.h> | |
159 | #endif | |
160 | #ifdef CONFIG_SPARC | |
161 | #endif | |
162 | ||
163 | #ifdef __hppa__ | |
164 | extern int pwrsw_enabled; | |
165 | #endif | |
166 | ||
167 | #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW | |
168 | extern int unaligned_enabled; | |
169 | #endif | |
170 | ||
171 | #ifdef CONFIG_IA64 | |
172 | extern int unaligned_dump_stack; | |
173 | #endif | |
174 | ||
175 | #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN | |
176 | extern int no_unaligned_warning; | |
177 | #endif | |
178 | ||
179 | #ifdef CONFIG_PROC_SYSCTL | |
180 | ||
181 | /** | |
182 | * enum sysctl_writes_mode - supported sysctl write modes | |
183 | * | |
184 | * @SYSCTL_WRITES_LEGACY: each write syscall must fully contain the sysctl value | |
185 | * to be written, and multiple writes on the same sysctl file descriptor | |
186 | * will rewrite the sysctl value, regardless of file position. No warning | |
187 | * is issued when the initial position is not 0. | |
188 | * @SYSCTL_WRITES_WARN: same as above but warn when the initial file position is | |
189 | * not 0. | |
190 | * @SYSCTL_WRITES_STRICT: writes to numeric sysctl entries must always be at | |
191 | * file position 0 and the value must be fully contained in the buffer | |
192 | * sent to the write syscall. If dealing with strings respect the file | |
193 | * position, but restrict this to the max length of the buffer, anything | |
194 | * passed the max lenght will be ignored. Multiple writes will append | |
195 | * to the buffer. | |
196 | * | |
197 | * These write modes control how current file position affects the behavior of | |
198 | * updating sysctl values through the proc interface on each write. | |
199 | */ | |
200 | enum sysctl_writes_mode { | |
201 | SYSCTL_WRITES_LEGACY = -1, | |
202 | SYSCTL_WRITES_WARN = 0, | |
203 | SYSCTL_WRITES_STRICT = 1, | |
204 | }; | |
205 | ||
206 | static enum sysctl_writes_mode sysctl_writes_strict = SYSCTL_WRITES_STRICT; | |
207 | ||
208 | static int proc_do_cad_pid(struct ctl_table *table, int write, | |
209 | void __user *buffer, size_t *lenp, loff_t *ppos); | |
210 | static int proc_taint(struct ctl_table *table, int write, | |
211 | void __user *buffer, size_t *lenp, loff_t *ppos); | |
212 | #endif | |
213 | ||
214 | #ifdef CONFIG_PRINTK | |
215 | static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write, | |
216 | void __user *buffer, size_t *lenp, loff_t *ppos); | |
217 | #endif | |
218 | ||
219 | static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write, | |
220 | void __user *buffer, size_t *lenp, loff_t *ppos); | |
221 | #ifdef CONFIG_COREDUMP | |
222 | static int proc_dostring_coredump(struct ctl_table *table, int write, | |
223 | void __user *buffer, size_t *lenp, loff_t *ppos); | |
224 | #endif | |
225 | static int proc_dopipe_max_size(struct ctl_table *table, int write, | |
226 | void __user *buffer, size_t *lenp, loff_t *ppos); | |
227 | ||
228 | #ifdef CONFIG_MAGIC_SYSRQ | |
229 | /* Note: sysrq code uses its own private copy */ | |
230 | static int __sysrq_enabled = CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE; | |
231 | ||
232 | static int sysrq_sysctl_handler(struct ctl_table *table, int write, | |
233 | void __user *buffer, size_t *lenp, | |
234 | loff_t *ppos) | |
235 | { | |
236 | int error; | |
237 | ||
238 | error = proc_dointvec(table, write, buffer, lenp, ppos); | |
239 | if (error) | |
240 | return error; | |
241 | ||
242 | if (write) | |
243 | sysrq_toggle_support(__sysrq_enabled); | |
244 | ||
245 | return 0; | |
246 | } | |
247 | ||
248 | #endif | |
249 | ||
250 | static struct ctl_table kern_table[]; | |
251 | static struct ctl_table vm_table[]; | |
252 | static struct ctl_table fs_table[]; | |
253 | static struct ctl_table debug_table[]; | |
254 | static struct ctl_table dev_table[]; | |
255 | extern struct ctl_table random_table[]; | |
256 | #ifdef CONFIG_EPOLL | |
257 | extern struct ctl_table epoll_table[]; | |
258 | #endif | |
259 | ||
260 | #ifdef CONFIG_FW_LOADER_USER_HELPER | |
261 | extern struct ctl_table firmware_config_table[]; | |
262 | #endif | |
263 | ||
264 | #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT | |
265 | int sysctl_legacy_va_layout; | |
266 | #endif | |
267 | ||
268 | /* The default sysctl tables: */ | |
269 | ||
270 | static struct ctl_table sysctl_base_table[] = { | |
271 | { | |
272 | .procname = "kernel", | |
273 | .mode = 0555, | |
274 | .child = kern_table, | |
275 | }, | |
276 | { | |
277 | .procname = "vm", | |
278 | .mode = 0555, | |
279 | .child = vm_table, | |
280 | }, | |
281 | { | |
282 | .procname = "fs", | |
283 | .mode = 0555, | |
284 | .child = fs_table, | |
285 | }, | |
286 | { | |
287 | .procname = "debug", | |
288 | .mode = 0555, | |
289 | .child = debug_table, | |
290 | }, | |
291 | { | |
292 | .procname = "dev", | |
293 | .mode = 0555, | |
294 | .child = dev_table, | |
295 | }, | |
296 | { } | |
297 | }; | |
298 | ||
299 | #ifdef CONFIG_SCHED_DEBUG | |
300 | static int min_sched_granularity_ns = 100000; /* 100 usecs */ | |
301 | static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */ | |
302 | static int min_wakeup_granularity_ns; /* 0 usecs */ | |
303 | static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */ | |
304 | #ifdef CONFIG_SMP | |
305 | static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE; | |
306 | static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1; | |
307 | #endif /* CONFIG_SMP */ | |
308 | #endif /* CONFIG_SCHED_DEBUG */ | |
309 | ||
310 | #ifdef CONFIG_COMPACTION | |
311 | static int min_extfrag_threshold; | |
312 | static int max_extfrag_threshold = 1000; | |
313 | #endif | |
314 | ||
315 | static struct ctl_table kern_table[] = { | |
316 | { | |
317 | .procname = "sched_child_runs_first", | |
318 | .data = &sysctl_sched_child_runs_first, | |
319 | .maxlen = sizeof(unsigned int), | |
320 | .mode = 0644, | |
321 | .proc_handler = proc_dointvec, | |
322 | }, | |
323 | #ifdef CONFIG_SCHED_DEBUG | |
324 | { | |
325 | .procname = "sched_min_granularity_ns", | |
326 | .data = &sysctl_sched_min_granularity, | |
327 | .maxlen = sizeof(unsigned int), | |
328 | .mode = 0644, | |
329 | .proc_handler = sched_proc_update_handler, | |
330 | .extra1 = &min_sched_granularity_ns, | |
331 | .extra2 = &max_sched_granularity_ns, | |
332 | }, | |
333 | { | |
334 | .procname = "sched_latency_ns", | |
335 | .data = &sysctl_sched_latency, | |
336 | .maxlen = sizeof(unsigned int), | |
337 | .mode = 0644, | |
338 | .proc_handler = sched_proc_update_handler, | |
339 | .extra1 = &min_sched_granularity_ns, | |
340 | .extra2 = &max_sched_granularity_ns, | |
341 | }, | |
342 | { | |
343 | .procname = "sched_wakeup_granularity_ns", | |
344 | .data = &sysctl_sched_wakeup_granularity, | |
345 | .maxlen = sizeof(unsigned int), | |
346 | .mode = 0644, | |
347 | .proc_handler = sched_proc_update_handler, | |
348 | .extra1 = &min_wakeup_granularity_ns, | |
349 | .extra2 = &max_wakeup_granularity_ns, | |
350 | }, | |
351 | #ifdef CONFIG_SMP | |
352 | { | |
353 | .procname = "sched_tunable_scaling", | |
354 | .data = &sysctl_sched_tunable_scaling, | |
355 | .maxlen = sizeof(enum sched_tunable_scaling), | |
356 | .mode = 0644, | |
357 | .proc_handler = sched_proc_update_handler, | |
358 | .extra1 = &min_sched_tunable_scaling, | |
359 | .extra2 = &max_sched_tunable_scaling, | |
360 | }, | |
361 | { | |
362 | .procname = "sched_migration_cost_ns", | |
363 | .data = &sysctl_sched_migration_cost, | |
364 | .maxlen = sizeof(unsigned int), | |
365 | .mode = 0644, | |
366 | .proc_handler = proc_dointvec, | |
367 | }, | |
368 | { | |
369 | .procname = "sched_nr_migrate", | |
370 | .data = &sysctl_sched_nr_migrate, | |
371 | .maxlen = sizeof(unsigned int), | |
372 | .mode = 0644, | |
373 | .proc_handler = proc_dointvec, | |
374 | }, | |
375 | #ifdef CONFIG_SCHEDSTATS | |
376 | { | |
377 | .procname = "sched_schedstats", | |
378 | .data = NULL, | |
379 | .maxlen = sizeof(unsigned int), | |
380 | .mode = 0644, | |
381 | .proc_handler = sysctl_schedstats, | |
382 | .extra1 = &zero, | |
383 | .extra2 = &one, | |
384 | }, | |
385 | #endif /* CONFIG_SCHEDSTATS */ | |
386 | #endif /* CONFIG_SMP */ | |
387 | #ifdef CONFIG_NUMA_BALANCING | |
388 | { | |
389 | .procname = "numa_balancing_scan_delay_ms", | |
390 | .data = &sysctl_numa_balancing_scan_delay, | |
391 | .maxlen = sizeof(unsigned int), | |
392 | .mode = 0644, | |
393 | .proc_handler = proc_dointvec, | |
394 | }, | |
395 | { | |
396 | .procname = "numa_balancing_scan_period_min_ms", | |
397 | .data = &sysctl_numa_balancing_scan_period_min, | |
398 | .maxlen = sizeof(unsigned int), | |
399 | .mode = 0644, | |
400 | .proc_handler = proc_dointvec, | |
401 | }, | |
402 | { | |
403 | .procname = "numa_balancing_scan_period_max_ms", | |
404 | .data = &sysctl_numa_balancing_scan_period_max, | |
405 | .maxlen = sizeof(unsigned int), | |
406 | .mode = 0644, | |
407 | .proc_handler = proc_dointvec, | |
408 | }, | |
409 | { | |
410 | .procname = "numa_balancing_scan_size_mb", | |
411 | .data = &sysctl_numa_balancing_scan_size, | |
412 | .maxlen = sizeof(unsigned int), | |
413 | .mode = 0644, | |
414 | .proc_handler = proc_dointvec_minmax, | |
415 | .extra1 = &one, | |
416 | }, | |
417 | { | |
418 | .procname = "numa_balancing", | |
419 | .data = NULL, /* filled in by handler */ | |
420 | .maxlen = sizeof(unsigned int), | |
421 | .mode = 0644, | |
422 | .proc_handler = sysctl_numa_balancing, | |
423 | .extra1 = &zero, | |
424 | .extra2 = &one, | |
425 | }, | |
426 | #endif /* CONFIG_NUMA_BALANCING */ | |
427 | #endif /* CONFIG_SCHED_DEBUG */ | |
428 | { | |
429 | .procname = "sched_rt_period_us", | |
430 | .data = &sysctl_sched_rt_period, | |
431 | .maxlen = sizeof(unsigned int), | |
432 | .mode = 0644, | |
433 | .proc_handler = sched_rt_handler, | |
434 | }, | |
435 | { | |
436 | .procname = "sched_rt_runtime_us", | |
437 | .data = &sysctl_sched_rt_runtime, | |
438 | .maxlen = sizeof(int), | |
439 | .mode = 0644, | |
440 | .proc_handler = sched_rt_handler, | |
441 | }, | |
442 | { | |
443 | .procname = "sched_rr_timeslice_ms", | |
444 | .data = &sysctl_sched_rr_timeslice, | |
445 | .maxlen = sizeof(int), | |
446 | .mode = 0644, | |
447 | .proc_handler = sched_rr_handler, | |
448 | }, | |
449 | #ifdef CONFIG_SCHED_AUTOGROUP | |
450 | { | |
451 | .procname = "sched_autogroup_enabled", | |
452 | .data = &sysctl_sched_autogroup_enabled, | |
453 | .maxlen = sizeof(unsigned int), | |
454 | .mode = 0644, | |
455 | .proc_handler = proc_dointvec_minmax, | |
456 | .extra1 = &zero, | |
457 | .extra2 = &one, | |
458 | }, | |
459 | #endif | |
460 | #ifdef CONFIG_CFS_BANDWIDTH | |
461 | { | |
462 | .procname = "sched_cfs_bandwidth_slice_us", | |
463 | .data = &sysctl_sched_cfs_bandwidth_slice, | |
464 | .maxlen = sizeof(unsigned int), | |
465 | .mode = 0644, | |
466 | .proc_handler = proc_dointvec_minmax, | |
467 | .extra1 = &one, | |
468 | }, | |
469 | #endif | |
470 | #ifdef CONFIG_PROVE_LOCKING | |
471 | { | |
472 | .procname = "prove_locking", | |
473 | .data = &prove_locking, | |
474 | .maxlen = sizeof(int), | |
475 | .mode = 0644, | |
476 | .proc_handler = proc_dointvec, | |
477 | }, | |
478 | #endif | |
479 | #ifdef CONFIG_LOCK_STAT | |
480 | { | |
481 | .procname = "lock_stat", | |
482 | .data = &lock_stat, | |
483 | .maxlen = sizeof(int), | |
484 | .mode = 0644, | |
485 | .proc_handler = proc_dointvec, | |
486 | }, | |
487 | #endif | |
488 | { | |
489 | .procname = "panic", | |
490 | .data = &panic_timeout, | |
491 | .maxlen = sizeof(int), | |
492 | .mode = 0644, | |
493 | .proc_handler = proc_dointvec, | |
494 | }, | |
495 | #ifdef CONFIG_COREDUMP | |
496 | { | |
497 | .procname = "core_uses_pid", | |
498 | .data = &core_uses_pid, | |
499 | .maxlen = sizeof(int), | |
500 | .mode = 0644, | |
501 | .proc_handler = proc_dointvec, | |
502 | }, | |
503 | { | |
504 | .procname = "core_pattern", | |
505 | .data = core_pattern, | |
506 | .maxlen = CORENAME_MAX_SIZE, | |
507 | .mode = 0644, | |
508 | .proc_handler = proc_dostring_coredump, | |
509 | }, | |
510 | { | |
511 | .procname = "core_pipe_limit", | |
512 | .data = &core_pipe_limit, | |
513 | .maxlen = sizeof(unsigned int), | |
514 | .mode = 0644, | |
515 | .proc_handler = proc_dointvec, | |
516 | }, | |
517 | #endif | |
518 | #ifdef CONFIG_PROC_SYSCTL | |
519 | { | |
520 | .procname = "tainted", | |
521 | .maxlen = sizeof(long), | |
522 | .mode = 0644, | |
523 | .proc_handler = proc_taint, | |
524 | }, | |
525 | { | |
526 | .procname = "sysctl_writes_strict", | |
527 | .data = &sysctl_writes_strict, | |
528 | .maxlen = sizeof(int), | |
529 | .mode = 0644, | |
530 | .proc_handler = proc_dointvec_minmax, | |
531 | .extra1 = &neg_one, | |
532 | .extra2 = &one, | |
533 | }, | |
534 | #endif | |
535 | #ifdef CONFIG_LATENCYTOP | |
536 | { | |
537 | .procname = "latencytop", | |
538 | .data = &latencytop_enabled, | |
539 | .maxlen = sizeof(int), | |
540 | .mode = 0644, | |
541 | .proc_handler = sysctl_latencytop, | |
542 | }, | |
543 | #endif | |
544 | #ifdef CONFIG_BLK_DEV_INITRD | |
545 | { | |
546 | .procname = "real-root-dev", | |
547 | .data = &real_root_dev, | |
548 | .maxlen = sizeof(int), | |
549 | .mode = 0644, | |
550 | .proc_handler = proc_dointvec, | |
551 | }, | |
552 | #endif | |
553 | { | |
554 | .procname = "print-fatal-signals", | |
555 | .data = &print_fatal_signals, | |
556 | .maxlen = sizeof(int), | |
557 | .mode = 0644, | |
558 | .proc_handler = proc_dointvec, | |
559 | }, | |
560 | #ifdef CONFIG_SPARC | |
561 | { | |
562 | .procname = "reboot-cmd", | |
563 | .data = reboot_command, | |
564 | .maxlen = 256, | |
565 | .mode = 0644, | |
566 | .proc_handler = proc_dostring, | |
567 | }, | |
568 | { | |
569 | .procname = "stop-a", | |
570 | .data = &stop_a_enabled, | |
571 | .maxlen = sizeof (int), | |
572 | .mode = 0644, | |
573 | .proc_handler = proc_dointvec, | |
574 | }, | |
575 | { | |
576 | .procname = "scons-poweroff", | |
577 | .data = &scons_pwroff, | |
578 | .maxlen = sizeof (int), | |
579 | .mode = 0644, | |
580 | .proc_handler = proc_dointvec, | |
581 | }, | |
582 | #endif | |
583 | #ifdef CONFIG_SPARC64 | |
584 | { | |
585 | .procname = "tsb-ratio", | |
586 | .data = &sysctl_tsb_ratio, | |
587 | .maxlen = sizeof (int), | |
588 | .mode = 0644, | |
589 | .proc_handler = proc_dointvec, | |
590 | }, | |
591 | #endif | |
592 | #ifdef __hppa__ | |
593 | { | |
594 | .procname = "soft-power", | |
595 | .data = &pwrsw_enabled, | |
596 | .maxlen = sizeof (int), | |
597 | .mode = 0644, | |
598 | .proc_handler = proc_dointvec, | |
599 | }, | |
600 | #endif | |
601 | #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW | |
602 | { | |
603 | .procname = "unaligned-trap", | |
604 | .data = &unaligned_enabled, | |
605 | .maxlen = sizeof (int), | |
606 | .mode = 0644, | |
607 | .proc_handler = proc_dointvec, | |
608 | }, | |
609 | #endif | |
610 | { | |
611 | .procname = "ctrl-alt-del", | |
612 | .data = &C_A_D, | |
613 | .maxlen = sizeof(int), | |
614 | .mode = 0644, | |
615 | .proc_handler = proc_dointvec, | |
616 | }, | |
617 | #ifdef CONFIG_FUNCTION_TRACER | |
618 | { | |
619 | .procname = "ftrace_enabled", | |
620 | .data = &ftrace_enabled, | |
621 | .maxlen = sizeof(int), | |
622 | .mode = 0644, | |
623 | .proc_handler = ftrace_enable_sysctl, | |
624 | }, | |
625 | #endif | |
626 | #ifdef CONFIG_STACK_TRACER | |
627 | { | |
628 | .procname = "stack_tracer_enabled", | |
629 | .data = &stack_tracer_enabled, | |
630 | .maxlen = sizeof(int), | |
631 | .mode = 0644, | |
632 | .proc_handler = stack_trace_sysctl, | |
633 | }, | |
634 | #endif | |
635 | #ifdef CONFIG_TRACING | |
636 | { | |
637 | .procname = "ftrace_dump_on_oops", | |
638 | .data = &ftrace_dump_on_oops, | |
639 | .maxlen = sizeof(int), | |
640 | .mode = 0644, | |
641 | .proc_handler = proc_dointvec, | |
642 | }, | |
643 | { | |
644 | .procname = "traceoff_on_warning", | |
645 | .data = &__disable_trace_on_warning, | |
646 | .maxlen = sizeof(__disable_trace_on_warning), | |
647 | .mode = 0644, | |
648 | .proc_handler = proc_dointvec, | |
649 | }, | |
650 | { | |
651 | .procname = "tracepoint_printk", | |
652 | .data = &tracepoint_printk, | |
653 | .maxlen = sizeof(tracepoint_printk), | |
654 | .mode = 0644, | |
655 | .proc_handler = tracepoint_printk_sysctl, | |
656 | }, | |
657 | #endif | |
658 | #ifdef CONFIG_KEXEC_CORE | |
659 | { | |
660 | .procname = "kexec_load_disabled", | |
661 | .data = &kexec_load_disabled, | |
662 | .maxlen = sizeof(int), | |
663 | .mode = 0644, | |
664 | /* only handle a transition from default "0" to "1" */ | |
665 | .proc_handler = proc_dointvec_minmax, | |
666 | .extra1 = &one, | |
667 | .extra2 = &one, | |
668 | }, | |
669 | #endif | |
670 | #ifdef CONFIG_MODULES | |
671 | { | |
672 | .procname = "modprobe", | |
673 | .data = &modprobe_path, | |
674 | .maxlen = KMOD_PATH_LEN, | |
675 | .mode = 0644, | |
676 | .proc_handler = proc_dostring, | |
677 | }, | |
678 | { | |
679 | .procname = "modules_disabled", | |
680 | .data = &modules_disabled, | |
681 | .maxlen = sizeof(int), | |
682 | .mode = 0644, | |
683 | /* only handle a transition from default "0" to "1" */ | |
684 | .proc_handler = proc_dointvec_minmax, | |
685 | .extra1 = &one, | |
686 | .extra2 = &one, | |
687 | }, | |
688 | #endif | |
689 | #ifdef CONFIG_UEVENT_HELPER | |
690 | { | |
691 | .procname = "hotplug", | |
692 | .data = &uevent_helper, | |
693 | .maxlen = UEVENT_HELPER_PATH_LEN, | |
694 | .mode = 0644, | |
695 | .proc_handler = proc_dostring, | |
696 | }, | |
697 | #endif | |
698 | #ifdef CONFIG_CHR_DEV_SG | |
699 | { | |
700 | .procname = "sg-big-buff", | |
701 | .data = &sg_big_buff, | |
702 | .maxlen = sizeof (int), | |
703 | .mode = 0444, | |
704 | .proc_handler = proc_dointvec, | |
705 | }, | |
706 | #endif | |
707 | #ifdef CONFIG_BSD_PROCESS_ACCT | |
708 | { | |
709 | .procname = "acct", | |
710 | .data = &acct_parm, | |
711 | .maxlen = 3*sizeof(int), | |
712 | .mode = 0644, | |
713 | .proc_handler = proc_dointvec, | |
714 | }, | |
715 | #endif | |
716 | #ifdef CONFIG_MAGIC_SYSRQ | |
717 | { | |
718 | .procname = "sysrq", | |
719 | .data = &__sysrq_enabled, | |
720 | .maxlen = sizeof (int), | |
721 | .mode = 0644, | |
722 | .proc_handler = sysrq_sysctl_handler, | |
723 | }, | |
724 | #endif | |
725 | #ifdef CONFIG_PROC_SYSCTL | |
726 | { | |
727 | .procname = "cad_pid", | |
728 | .data = NULL, | |
729 | .maxlen = sizeof (int), | |
730 | .mode = 0600, | |
731 | .proc_handler = proc_do_cad_pid, | |
732 | }, | |
733 | #endif | |
734 | { | |
735 | .procname = "threads-max", | |
736 | .data = NULL, | |
737 | .maxlen = sizeof(int), | |
738 | .mode = 0644, | |
739 | .proc_handler = sysctl_max_threads, | |
740 | }, | |
741 | { | |
742 | .procname = "random", | |
743 | .mode = 0555, | |
744 | .child = random_table, | |
745 | }, | |
746 | { | |
747 | .procname = "usermodehelper", | |
748 | .mode = 0555, | |
749 | .child = usermodehelper_table, | |
750 | }, | |
751 | #ifdef CONFIG_FW_LOADER_USER_HELPER | |
752 | { | |
753 | .procname = "firmware_config", | |
754 | .mode = 0555, | |
755 | .child = firmware_config_table, | |
756 | }, | |
757 | #endif | |
758 | { | |
759 | .procname = "overflowuid", | |
760 | .data = &overflowuid, | |
761 | .maxlen = sizeof(int), | |
762 | .mode = 0644, | |
763 | .proc_handler = proc_dointvec_minmax, | |
764 | .extra1 = &minolduid, | |
765 | .extra2 = &maxolduid, | |
766 | }, | |
767 | { | |
768 | .procname = "overflowgid", | |
769 | .data = &overflowgid, | |
770 | .maxlen = sizeof(int), | |
771 | .mode = 0644, | |
772 | .proc_handler = proc_dointvec_minmax, | |
773 | .extra1 = &minolduid, | |
774 | .extra2 = &maxolduid, | |
775 | }, | |
776 | #ifdef CONFIG_S390 | |
777 | #ifdef CONFIG_MATHEMU | |
778 | { | |
779 | .procname = "ieee_emulation_warnings", | |
780 | .data = &sysctl_ieee_emulation_warnings, | |
781 | .maxlen = sizeof(int), | |
782 | .mode = 0644, | |
783 | .proc_handler = proc_dointvec, | |
784 | }, | |
785 | #endif | |
786 | { | |
787 | .procname = "userprocess_debug", | |
788 | .data = &show_unhandled_signals, | |
789 | .maxlen = sizeof(int), | |
790 | .mode = 0644, | |
791 | .proc_handler = proc_dointvec, | |
792 | }, | |
793 | #endif | |
794 | { | |
795 | .procname = "pid_max", | |
796 | .data = &pid_max, | |
797 | .maxlen = sizeof (int), | |
798 | .mode = 0644, | |
799 | .proc_handler = proc_dointvec_minmax, | |
800 | .extra1 = &pid_max_min, | |
801 | .extra2 = &pid_max_max, | |
802 | }, | |
803 | { | |
804 | .procname = "panic_on_oops", | |
805 | .data = &panic_on_oops, | |
806 | .maxlen = sizeof(int), | |
807 | .mode = 0644, | |
808 | .proc_handler = proc_dointvec, | |
809 | }, | |
810 | #if defined CONFIG_PRINTK | |
811 | { | |
812 | .procname = "printk", | |
813 | .data = &console_loglevel, | |
814 | .maxlen = 4*sizeof(int), | |
815 | .mode = 0644, | |
816 | .proc_handler = proc_dointvec, | |
817 | }, | |
818 | { | |
819 | .procname = "printk_ratelimit", | |
820 | .data = &printk_ratelimit_state.interval, | |
821 | .maxlen = sizeof(int), | |
822 | .mode = 0644, | |
823 | .proc_handler = proc_dointvec_jiffies, | |
824 | }, | |
825 | { | |
826 | .procname = "printk_ratelimit_burst", | |
827 | .data = &printk_ratelimit_state.burst, | |
828 | .maxlen = sizeof(int), | |
829 | .mode = 0644, | |
830 | .proc_handler = proc_dointvec, | |
831 | }, | |
832 | { | |
833 | .procname = "printk_delay", | |
834 | .data = &printk_delay_msec, | |
835 | .maxlen = sizeof(int), | |
836 | .mode = 0644, | |
837 | .proc_handler = proc_dointvec_minmax, | |
838 | .extra1 = &zero, | |
839 | .extra2 = &ten_thousand, | |
840 | }, | |
841 | { | |
842 | .procname = "printk_devkmsg", | |
843 | .data = devkmsg_log_str, | |
844 | .maxlen = DEVKMSG_STR_MAX_SIZE, | |
845 | .mode = 0644, | |
846 | .proc_handler = devkmsg_sysctl_set_loglvl, | |
847 | }, | |
848 | { | |
849 | .procname = "dmesg_restrict", | |
850 | .data = &dmesg_restrict, | |
851 | .maxlen = sizeof(int), | |
852 | .mode = 0644, | |
853 | .proc_handler = proc_dointvec_minmax_sysadmin, | |
854 | .extra1 = &zero, | |
855 | .extra2 = &one, | |
856 | }, | |
857 | { | |
858 | .procname = "kptr_restrict", | |
859 | .data = &kptr_restrict, | |
860 | .maxlen = sizeof(int), | |
861 | .mode = 0644, | |
862 | .proc_handler = proc_dointvec_minmax_sysadmin, | |
863 | .extra1 = &zero, | |
864 | .extra2 = &two, | |
865 | }, | |
866 | #endif | |
867 | { | |
868 | .procname = "ngroups_max", | |
869 | .data = &ngroups_max, | |
870 | .maxlen = sizeof (int), | |
871 | .mode = 0444, | |
872 | .proc_handler = proc_dointvec, | |
873 | }, | |
874 | { | |
875 | .procname = "cap_last_cap", | |
876 | .data = (void *)&cap_last_cap, | |
877 | .maxlen = sizeof(int), | |
878 | .mode = 0444, | |
879 | .proc_handler = proc_dointvec, | |
880 | }, | |
881 | #if defined(CONFIG_LOCKUP_DETECTOR) | |
882 | { | |
883 | .procname = "watchdog", | |
884 | .data = &watchdog_user_enabled, | |
885 | .maxlen = sizeof(int), | |
886 | .mode = 0644, | |
887 | .proc_handler = proc_watchdog, | |
888 | .extra1 = &zero, | |
889 | .extra2 = &one, | |
890 | }, | |
891 | { | |
892 | .procname = "watchdog_thresh", | |
893 | .data = &watchdog_thresh, | |
894 | .maxlen = sizeof(int), | |
895 | .mode = 0644, | |
896 | .proc_handler = proc_watchdog_thresh, | |
897 | .extra1 = &zero, | |
898 | .extra2 = &sixty, | |
899 | }, | |
900 | { | |
901 | .procname = "nmi_watchdog", | |
902 | .data = &nmi_watchdog_user_enabled, | |
903 | .maxlen = sizeof(int), | |
904 | .mode = NMI_WATCHDOG_SYSCTL_PERM, | |
905 | .proc_handler = proc_nmi_watchdog, | |
906 | .extra1 = &zero, | |
907 | .extra2 = &one, | |
908 | }, | |
909 | { | |
910 | .procname = "watchdog_cpumask", | |
911 | .data = &watchdog_cpumask_bits, | |
912 | .maxlen = NR_CPUS, | |
913 | .mode = 0644, | |
914 | .proc_handler = proc_watchdog_cpumask, | |
915 | }, | |
916 | #ifdef CONFIG_SOFTLOCKUP_DETECTOR | |
917 | { | |
918 | .procname = "soft_watchdog", | |
919 | .data = &soft_watchdog_user_enabled, | |
920 | .maxlen = sizeof(int), | |
921 | .mode = 0644, | |
922 | .proc_handler = proc_soft_watchdog, | |
923 | .extra1 = &zero, | |
924 | .extra2 = &one, | |
925 | }, | |
926 | { | |
927 | .procname = "softlockup_panic", | |
928 | .data = &softlockup_panic, | |
929 | .maxlen = sizeof(int), | |
930 | .mode = 0644, | |
931 | .proc_handler = proc_dointvec_minmax, | |
932 | .extra1 = &zero, | |
933 | .extra2 = &one, | |
934 | }, | |
935 | #ifdef CONFIG_SMP | |
936 | { | |
937 | .procname = "softlockup_all_cpu_backtrace", | |
938 | .data = &sysctl_softlockup_all_cpu_backtrace, | |
939 | .maxlen = sizeof(int), | |
940 | .mode = 0644, | |
941 | .proc_handler = proc_dointvec_minmax, | |
942 | .extra1 = &zero, | |
943 | .extra2 = &one, | |
944 | }, | |
945 | #endif /* CONFIG_SMP */ | |
946 | #endif | |
947 | #ifdef CONFIG_HARDLOCKUP_DETECTOR | |
948 | { | |
949 | .procname = "hardlockup_panic", | |
950 | .data = &hardlockup_panic, | |
951 | .maxlen = sizeof(int), | |
952 | .mode = 0644, | |
953 | .proc_handler = proc_dointvec_minmax, | |
954 | .extra1 = &zero, | |
955 | .extra2 = &one, | |
956 | }, | |
957 | #ifdef CONFIG_SMP | |
958 | { | |
959 | .procname = "hardlockup_all_cpu_backtrace", | |
960 | .data = &sysctl_hardlockup_all_cpu_backtrace, | |
961 | .maxlen = sizeof(int), | |
962 | .mode = 0644, | |
963 | .proc_handler = proc_dointvec_minmax, | |
964 | .extra1 = &zero, | |
965 | .extra2 = &one, | |
966 | }, | |
967 | #endif /* CONFIG_SMP */ | |
968 | #endif | |
969 | #endif | |
970 | ||
971 | #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86) | |
972 | { | |
973 | .procname = "unknown_nmi_panic", | |
974 | .data = &unknown_nmi_panic, | |
975 | .maxlen = sizeof (int), | |
976 | .mode = 0644, | |
977 | .proc_handler = proc_dointvec, | |
978 | }, | |
979 | #endif | |
980 | #if defined(CONFIG_X86) | |
981 | { | |
982 | .procname = "panic_on_unrecovered_nmi", | |
983 | .data = &panic_on_unrecovered_nmi, | |
984 | .maxlen = sizeof(int), | |
985 | .mode = 0644, | |
986 | .proc_handler = proc_dointvec, | |
987 | }, | |
988 | { | |
989 | .procname = "panic_on_io_nmi", | |
990 | .data = &panic_on_io_nmi, | |
991 | .maxlen = sizeof(int), | |
992 | .mode = 0644, | |
993 | .proc_handler = proc_dointvec, | |
994 | }, | |
995 | #ifdef CONFIG_DEBUG_STACKOVERFLOW | |
996 | { | |
997 | .procname = "panic_on_stackoverflow", | |
998 | .data = &sysctl_panic_on_stackoverflow, | |
999 | .maxlen = sizeof(int), | |
1000 | .mode = 0644, | |
1001 | .proc_handler = proc_dointvec, | |
1002 | }, | |
1003 | #endif | |
1004 | { | |
1005 | .procname = "bootloader_type", | |
1006 | .data = &bootloader_type, | |
1007 | .maxlen = sizeof (int), | |
1008 | .mode = 0444, | |
1009 | .proc_handler = proc_dointvec, | |
1010 | }, | |
1011 | { | |
1012 | .procname = "bootloader_version", | |
1013 | .data = &bootloader_version, | |
1014 | .maxlen = sizeof (int), | |
1015 | .mode = 0444, | |
1016 | .proc_handler = proc_dointvec, | |
1017 | }, | |
1018 | { | |
1019 | .procname = "io_delay_type", | |
1020 | .data = &io_delay_type, | |
1021 | .maxlen = sizeof(int), | |
1022 | .mode = 0644, | |
1023 | .proc_handler = proc_dointvec, | |
1024 | }, | |
1025 | #endif | |
1026 | #if defined(CONFIG_MMU) | |
1027 | { | |
1028 | .procname = "randomize_va_space", | |
1029 | .data = &randomize_va_space, | |
1030 | .maxlen = sizeof(int), | |
1031 | .mode = 0644, | |
1032 | .proc_handler = proc_dointvec, | |
1033 | }, | |
1034 | #endif | |
1035 | #if defined(CONFIG_S390) && defined(CONFIG_SMP) | |
1036 | { | |
1037 | .procname = "spin_retry", | |
1038 | .data = &spin_retry, | |
1039 | .maxlen = sizeof (int), | |
1040 | .mode = 0644, | |
1041 | .proc_handler = proc_dointvec, | |
1042 | }, | |
1043 | #endif | |
1044 | #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86) | |
1045 | { | |
1046 | .procname = "acpi_video_flags", | |
1047 | .data = &acpi_realmode_flags, | |
1048 | .maxlen = sizeof (unsigned long), | |
1049 | .mode = 0644, | |
1050 | .proc_handler = proc_doulongvec_minmax, | |
1051 | }, | |
1052 | #endif | |
1053 | #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN | |
1054 | { | |
1055 | .procname = "ignore-unaligned-usertrap", | |
1056 | .data = &no_unaligned_warning, | |
1057 | .maxlen = sizeof (int), | |
1058 | .mode = 0644, | |
1059 | .proc_handler = proc_dointvec, | |
1060 | }, | |
1061 | #endif | |
1062 | #ifdef CONFIG_IA64 | |
1063 | { | |
1064 | .procname = "unaligned-dump-stack", | |
1065 | .data = &unaligned_dump_stack, | |
1066 | .maxlen = sizeof (int), | |
1067 | .mode = 0644, | |
1068 | .proc_handler = proc_dointvec, | |
1069 | }, | |
1070 | #endif | |
1071 | #ifdef CONFIG_DETECT_HUNG_TASK | |
1072 | { | |
1073 | .procname = "hung_task_panic", | |
1074 | .data = &sysctl_hung_task_panic, | |
1075 | .maxlen = sizeof(int), | |
1076 | .mode = 0644, | |
1077 | .proc_handler = proc_dointvec_minmax, | |
1078 | .extra1 = &zero, | |
1079 | .extra2 = &one, | |
1080 | }, | |
1081 | { | |
1082 | .procname = "hung_task_check_count", | |
1083 | .data = &sysctl_hung_task_check_count, | |
1084 | .maxlen = sizeof(int), | |
1085 | .mode = 0644, | |
1086 | .proc_handler = proc_dointvec_minmax, | |
1087 | .extra1 = &zero, | |
1088 | }, | |
1089 | { | |
1090 | .procname = "hung_task_timeout_secs", | |
1091 | .data = &sysctl_hung_task_timeout_secs, | |
1092 | .maxlen = sizeof(unsigned long), | |
1093 | .mode = 0644, | |
1094 | .proc_handler = proc_dohung_task_timeout_secs, | |
1095 | .extra2 = &hung_task_timeout_max, | |
1096 | }, | |
1097 | { | |
1098 | .procname = "hung_task_check_interval_secs", | |
1099 | .data = &sysctl_hung_task_check_interval_secs, | |
1100 | .maxlen = sizeof(unsigned long), | |
1101 | .mode = 0644, | |
1102 | .proc_handler = proc_dohung_task_timeout_secs, | |
1103 | .extra2 = &hung_task_timeout_max, | |
1104 | }, | |
1105 | { | |
1106 | .procname = "hung_task_warnings", | |
1107 | .data = &sysctl_hung_task_warnings, | |
1108 | .maxlen = sizeof(int), | |
1109 | .mode = 0644, | |
1110 | .proc_handler = proc_dointvec_minmax, | |
1111 | .extra1 = &neg_one, | |
1112 | }, | |
1113 | #endif | |
1114 | #ifdef CONFIG_RT_MUTEXES | |
1115 | { | |
1116 | .procname = "max_lock_depth", | |
1117 | .data = &max_lock_depth, | |
1118 | .maxlen = sizeof(int), | |
1119 | .mode = 0644, | |
1120 | .proc_handler = proc_dointvec, | |
1121 | }, | |
1122 | #endif | |
1123 | { | |
1124 | .procname = "poweroff_cmd", | |
1125 | .data = &poweroff_cmd, | |
1126 | .maxlen = POWEROFF_CMD_PATH_LEN, | |
1127 | .mode = 0644, | |
1128 | .proc_handler = proc_dostring, | |
1129 | }, | |
1130 | #ifdef CONFIG_KEYS | |
1131 | { | |
1132 | .procname = "keys", | |
1133 | .mode = 0555, | |
1134 | .child = key_sysctls, | |
1135 | }, | |
1136 | #endif | |
1137 | #ifdef CONFIG_PERF_EVENTS | |
1138 | /* | |
1139 | * User-space scripts rely on the existence of this file | |
1140 | * as a feature check for perf_events being enabled. | |
1141 | * | |
1142 | * So it's an ABI, do not remove! | |
1143 | */ | |
1144 | { | |
1145 | .procname = "perf_event_paranoid", | |
1146 | .data = &sysctl_perf_event_paranoid, | |
1147 | .maxlen = sizeof(sysctl_perf_event_paranoid), | |
1148 | .mode = 0644, | |
1149 | .proc_handler = proc_dointvec, | |
1150 | }, | |
1151 | { | |
1152 | .procname = "perf_event_mlock_kb", | |
1153 | .data = &sysctl_perf_event_mlock, | |
1154 | .maxlen = sizeof(sysctl_perf_event_mlock), | |
1155 | .mode = 0644, | |
1156 | .proc_handler = proc_dointvec, | |
1157 | }, | |
1158 | { | |
1159 | .procname = "perf_event_max_sample_rate", | |
1160 | .data = &sysctl_perf_event_sample_rate, | |
1161 | .maxlen = sizeof(sysctl_perf_event_sample_rate), | |
1162 | .mode = 0644, | |
1163 | .proc_handler = perf_proc_update_handler, | |
1164 | .extra1 = &one, | |
1165 | }, | |
1166 | { | |
1167 | .procname = "perf_cpu_time_max_percent", | |
1168 | .data = &sysctl_perf_cpu_time_max_percent, | |
1169 | .maxlen = sizeof(sysctl_perf_cpu_time_max_percent), | |
1170 | .mode = 0644, | |
1171 | .proc_handler = perf_cpu_time_max_percent_handler, | |
1172 | .extra1 = &zero, | |
1173 | .extra2 = &one_hundred, | |
1174 | }, | |
1175 | { | |
1176 | .procname = "perf_event_max_stack", | |
1177 | .data = &sysctl_perf_event_max_stack, | |
1178 | .maxlen = sizeof(sysctl_perf_event_max_stack), | |
1179 | .mode = 0644, | |
1180 | .proc_handler = perf_event_max_stack_handler, | |
1181 | .extra1 = &zero, | |
1182 | .extra2 = &six_hundred_forty_kb, | |
1183 | }, | |
1184 | { | |
1185 | .procname = "perf_event_max_contexts_per_stack", | |
1186 | .data = &sysctl_perf_event_max_contexts_per_stack, | |
1187 | .maxlen = sizeof(sysctl_perf_event_max_contexts_per_stack), | |
1188 | .mode = 0644, | |
1189 | .proc_handler = perf_event_max_stack_handler, | |
1190 | .extra1 = &zero, | |
1191 | .extra2 = &one_thousand, | |
1192 | }, | |
1193 | #endif | |
1194 | { | |
1195 | .procname = "panic_on_warn", | |
1196 | .data = &panic_on_warn, | |
1197 | .maxlen = sizeof(int), | |
1198 | .mode = 0644, | |
1199 | .proc_handler = proc_dointvec_minmax, | |
1200 | .extra1 = &zero, | |
1201 | .extra2 = &one, | |
1202 | }, | |
1203 | #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON) | |
1204 | { | |
1205 | .procname = "timer_migration", | |
1206 | .data = &sysctl_timer_migration, | |
1207 | .maxlen = sizeof(unsigned int), | |
1208 | .mode = 0644, | |
1209 | .proc_handler = timer_migration_handler, | |
1210 | .extra1 = &zero, | |
1211 | .extra2 = &one, | |
1212 | }, | |
1213 | #endif | |
1214 | #ifdef CONFIG_BPF_SYSCALL | |
1215 | { | |
1216 | .procname = "unprivileged_bpf_disabled", | |
1217 | .data = &sysctl_unprivileged_bpf_disabled, | |
1218 | .maxlen = sizeof(sysctl_unprivileged_bpf_disabled), | |
1219 | .mode = 0644, | |
1220 | /* only handle a transition from default "0" to "1" */ | |
1221 | .proc_handler = proc_dointvec_minmax, | |
1222 | .extra1 = &one, | |
1223 | .extra2 = &one, | |
1224 | }, | |
1225 | #endif | |
1226 | #if defined(CONFIG_TREE_RCU) || defined(CONFIG_PREEMPT_RCU) | |
1227 | { | |
1228 | .procname = "panic_on_rcu_stall", | |
1229 | .data = &sysctl_panic_on_rcu_stall, | |
1230 | .maxlen = sizeof(sysctl_panic_on_rcu_stall), | |
1231 | .mode = 0644, | |
1232 | .proc_handler = proc_dointvec_minmax, | |
1233 | .extra1 = &zero, | |
1234 | .extra2 = &one, | |
1235 | }, | |
1236 | #endif | |
1237 | #ifdef CONFIG_STACKLEAK_RUNTIME_DISABLE | |
1238 | { | |
1239 | .procname = "stack_erasing", | |
1240 | .data = NULL, | |
1241 | .maxlen = sizeof(int), | |
1242 | .mode = 0600, | |
1243 | .proc_handler = stack_erasing_sysctl, | |
1244 | .extra1 = &zero, | |
1245 | .extra2 = &one, | |
1246 | }, | |
1247 | #endif | |
1248 | { } | |
1249 | }; | |
1250 | ||
1251 | static struct ctl_table vm_table[] = { | |
1252 | { | |
1253 | .procname = "overcommit_memory", | |
1254 | .data = &sysctl_overcommit_memory, | |
1255 | .maxlen = sizeof(sysctl_overcommit_memory), | |
1256 | .mode = 0644, | |
1257 | .proc_handler = proc_dointvec_minmax, | |
1258 | .extra1 = &zero, | |
1259 | .extra2 = &two, | |
1260 | }, | |
1261 | { | |
1262 | .procname = "panic_on_oom", | |
1263 | .data = &sysctl_panic_on_oom, | |
1264 | .maxlen = sizeof(sysctl_panic_on_oom), | |
1265 | .mode = 0644, | |
1266 | .proc_handler = proc_dointvec_minmax, | |
1267 | .extra1 = &zero, | |
1268 | .extra2 = &two, | |
1269 | }, | |
1270 | { | |
1271 | .procname = "oom_kill_allocating_task", | |
1272 | .data = &sysctl_oom_kill_allocating_task, | |
1273 | .maxlen = sizeof(sysctl_oom_kill_allocating_task), | |
1274 | .mode = 0644, | |
1275 | .proc_handler = proc_dointvec, | |
1276 | }, | |
1277 | { | |
1278 | .procname = "oom_dump_tasks", | |
1279 | .data = &sysctl_oom_dump_tasks, | |
1280 | .maxlen = sizeof(sysctl_oom_dump_tasks), | |
1281 | .mode = 0644, | |
1282 | .proc_handler = proc_dointvec, | |
1283 | }, | |
1284 | { | |
1285 | .procname = "overcommit_ratio", | |
1286 | .data = &sysctl_overcommit_ratio, | |
1287 | .maxlen = sizeof(sysctl_overcommit_ratio), | |
1288 | .mode = 0644, | |
1289 | .proc_handler = overcommit_ratio_handler, | |
1290 | }, | |
1291 | { | |
1292 | .procname = "overcommit_kbytes", | |
1293 | .data = &sysctl_overcommit_kbytes, | |
1294 | .maxlen = sizeof(sysctl_overcommit_kbytes), | |
1295 | .mode = 0644, | |
1296 | .proc_handler = overcommit_kbytes_handler, | |
1297 | }, | |
1298 | { | |
1299 | .procname = "page-cluster", | |
1300 | .data = &page_cluster, | |
1301 | .maxlen = sizeof(int), | |
1302 | .mode = 0644, | |
1303 | .proc_handler = proc_dointvec_minmax, | |
1304 | .extra1 = &zero, | |
1305 | }, | |
1306 | { | |
1307 | .procname = "dirty_background_ratio", | |
1308 | .data = &dirty_background_ratio, | |
1309 | .maxlen = sizeof(dirty_background_ratio), | |
1310 | .mode = 0644, | |
1311 | .proc_handler = dirty_background_ratio_handler, | |
1312 | .extra1 = &zero, | |
1313 | .extra2 = &one_hundred, | |
1314 | }, | |
1315 | { | |
1316 | .procname = "dirty_background_bytes", | |
1317 | .data = &dirty_background_bytes, | |
1318 | .maxlen = sizeof(dirty_background_bytes), | |
1319 | .mode = 0644, | |
1320 | .proc_handler = dirty_background_bytes_handler, | |
1321 | .extra1 = &one_ul, | |
1322 | }, | |
1323 | { | |
1324 | .procname = "dirty_ratio", | |
1325 | .data = &vm_dirty_ratio, | |
1326 | .maxlen = sizeof(vm_dirty_ratio), | |
1327 | .mode = 0644, | |
1328 | .proc_handler = dirty_ratio_handler, | |
1329 | .extra1 = &zero, | |
1330 | .extra2 = &one_hundred, | |
1331 | }, | |
1332 | { | |
1333 | .procname = "dirty_bytes", | |
1334 | .data = &vm_dirty_bytes, | |
1335 | .maxlen = sizeof(vm_dirty_bytes), | |
1336 | .mode = 0644, | |
1337 | .proc_handler = dirty_bytes_handler, | |
1338 | .extra1 = &dirty_bytes_min, | |
1339 | }, | |
1340 | { | |
1341 | .procname = "dirty_writeback_centisecs", | |
1342 | .data = &dirty_writeback_interval, | |
1343 | .maxlen = sizeof(dirty_writeback_interval), | |
1344 | .mode = 0644, | |
1345 | .proc_handler = dirty_writeback_centisecs_handler, | |
1346 | }, | |
1347 | { | |
1348 | .procname = "dirty_expire_centisecs", | |
1349 | .data = &dirty_expire_interval, | |
1350 | .maxlen = sizeof(dirty_expire_interval), | |
1351 | .mode = 0644, | |
1352 | .proc_handler = proc_dointvec_minmax, | |
1353 | .extra1 = &zero, | |
1354 | }, | |
1355 | { | |
1356 | .procname = "dirtytime_expire_seconds", | |
1357 | .data = &dirtytime_expire_interval, | |
1358 | .maxlen = sizeof(dirtytime_expire_interval), | |
1359 | .mode = 0644, | |
1360 | .proc_handler = dirtytime_interval_handler, | |
1361 | .extra1 = &zero, | |
1362 | }, | |
1363 | { | |
1364 | .procname = "swappiness", | |
1365 | .data = &vm_swappiness, | |
1366 | .maxlen = sizeof(vm_swappiness), | |
1367 | .mode = 0644, | |
1368 | .proc_handler = proc_dointvec_minmax, | |
1369 | .extra1 = &zero, | |
1370 | .extra2 = &one_hundred, | |
1371 | }, | |
1372 | #ifdef CONFIG_HUGETLB_PAGE | |
1373 | { | |
1374 | .procname = "nr_hugepages", | |
1375 | .data = NULL, | |
1376 | .maxlen = sizeof(unsigned long), | |
1377 | .mode = 0644, | |
1378 | .proc_handler = hugetlb_sysctl_handler, | |
1379 | }, | |
1380 | #ifdef CONFIG_NUMA | |
1381 | { | |
1382 | .procname = "nr_hugepages_mempolicy", | |
1383 | .data = NULL, | |
1384 | .maxlen = sizeof(unsigned long), | |
1385 | .mode = 0644, | |
1386 | .proc_handler = &hugetlb_mempolicy_sysctl_handler, | |
1387 | }, | |
1388 | { | |
1389 | .procname = "numa_stat", | |
1390 | .data = &sysctl_vm_numa_stat, | |
1391 | .maxlen = sizeof(int), | |
1392 | .mode = 0644, | |
1393 | .proc_handler = sysctl_vm_numa_stat_handler, | |
1394 | .extra1 = &zero, | |
1395 | .extra2 = &one, | |
1396 | }, | |
1397 | #endif | |
1398 | { | |
1399 | .procname = "hugetlb_shm_group", | |
1400 | .data = &sysctl_hugetlb_shm_group, | |
1401 | .maxlen = sizeof(gid_t), | |
1402 | .mode = 0644, | |
1403 | .proc_handler = proc_dointvec, | |
1404 | }, | |
1405 | { | |
1406 | .procname = "nr_overcommit_hugepages", | |
1407 | .data = NULL, | |
1408 | .maxlen = sizeof(unsigned long), | |
1409 | .mode = 0644, | |
1410 | .proc_handler = hugetlb_overcommit_handler, | |
1411 | }, | |
1412 | #endif | |
1413 | { | |
1414 | .procname = "lowmem_reserve_ratio", | |
1415 | .data = &sysctl_lowmem_reserve_ratio, | |
1416 | .maxlen = sizeof(sysctl_lowmem_reserve_ratio), | |
1417 | .mode = 0644, | |
1418 | .proc_handler = lowmem_reserve_ratio_sysctl_handler, | |
1419 | }, | |
1420 | { | |
1421 | .procname = "drop_caches", | |
1422 | .data = &sysctl_drop_caches, | |
1423 | .maxlen = sizeof(int), | |
1424 | .mode = 0644, | |
1425 | .proc_handler = drop_caches_sysctl_handler, | |
1426 | .extra1 = &one, | |
1427 | .extra2 = &four, | |
1428 | }, | |
1429 | #ifdef CONFIG_COMPACTION | |
1430 | { | |
1431 | .procname = "compact_memory", | |
1432 | .data = &sysctl_compact_memory, | |
1433 | .maxlen = sizeof(int), | |
1434 | .mode = 0200, | |
1435 | .proc_handler = sysctl_compaction_handler, | |
1436 | }, | |
1437 | { | |
1438 | .procname = "extfrag_threshold", | |
1439 | .data = &sysctl_extfrag_threshold, | |
1440 | .maxlen = sizeof(int), | |
1441 | .mode = 0644, | |
1442 | .proc_handler = sysctl_extfrag_handler, | |
1443 | .extra1 = &min_extfrag_threshold, | |
1444 | .extra2 = &max_extfrag_threshold, | |
1445 | }, | |
1446 | { | |
1447 | .procname = "compact_unevictable_allowed", | |
1448 | .data = &sysctl_compact_unevictable_allowed, | |
1449 | .maxlen = sizeof(int), | |
1450 | .mode = 0644, | |
1451 | .proc_handler = proc_dointvec, | |
1452 | .extra1 = &zero, | |
1453 | .extra2 = &one, | |
1454 | }, | |
1455 | ||
1456 | #endif /* CONFIG_COMPACTION */ | |
1457 | { | |
1458 | .procname = "min_free_kbytes", | |
1459 | .data = &min_free_kbytes, | |
1460 | .maxlen = sizeof(min_free_kbytes), | |
1461 | .mode = 0644, | |
1462 | .proc_handler = min_free_kbytes_sysctl_handler, | |
1463 | .extra1 = &zero, | |
1464 | }, | |
1465 | { | |
1466 | .procname = "watermark_scale_factor", | |
1467 | .data = &watermark_scale_factor, | |
1468 | .maxlen = sizeof(watermark_scale_factor), | |
1469 | .mode = 0644, | |
1470 | .proc_handler = watermark_scale_factor_sysctl_handler, | |
1471 | .extra1 = &one, | |
1472 | .extra2 = &one_thousand, | |
1473 | }, | |
1474 | { | |
1475 | .procname = "percpu_pagelist_fraction", | |
1476 | .data = &percpu_pagelist_fraction, | |
1477 | .maxlen = sizeof(percpu_pagelist_fraction), | |
1478 | .mode = 0644, | |
1479 | .proc_handler = percpu_pagelist_fraction_sysctl_handler, | |
1480 | .extra1 = &zero, | |
1481 | }, | |
1482 | #ifdef CONFIG_MMU | |
1483 | { | |
1484 | .procname = "max_map_count", | |
1485 | .data = &sysctl_max_map_count, | |
1486 | .maxlen = sizeof(sysctl_max_map_count), | |
1487 | .mode = 0644, | |
1488 | .proc_handler = proc_dointvec_minmax, | |
1489 | .extra1 = &zero, | |
1490 | }, | |
1491 | #else | |
1492 | { | |
1493 | .procname = "nr_trim_pages", | |
1494 | .data = &sysctl_nr_trim_pages, | |
1495 | .maxlen = sizeof(sysctl_nr_trim_pages), | |
1496 | .mode = 0644, | |
1497 | .proc_handler = proc_dointvec_minmax, | |
1498 | .extra1 = &zero, | |
1499 | }, | |
1500 | #endif | |
1501 | { | |
1502 | .procname = "laptop_mode", | |
1503 | .data = &laptop_mode, | |
1504 | .maxlen = sizeof(laptop_mode), | |
1505 | .mode = 0644, | |
1506 | .proc_handler = proc_dointvec_jiffies, | |
1507 | }, | |
1508 | { | |
1509 | .procname = "block_dump", | |
1510 | .data = &block_dump, | |
1511 | .maxlen = sizeof(block_dump), | |
1512 | .mode = 0644, | |
1513 | .proc_handler = proc_dointvec, | |
1514 | .extra1 = &zero, | |
1515 | }, | |
1516 | { | |
1517 | .procname = "vfs_cache_pressure", | |
1518 | .data = &sysctl_vfs_cache_pressure, | |
1519 | .maxlen = sizeof(sysctl_vfs_cache_pressure), | |
1520 | .mode = 0644, | |
1521 | .proc_handler = proc_dointvec, | |
1522 | .extra1 = &zero, | |
1523 | }, | |
1524 | #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT | |
1525 | { | |
1526 | .procname = "legacy_va_layout", | |
1527 | .data = &sysctl_legacy_va_layout, | |
1528 | .maxlen = sizeof(sysctl_legacy_va_layout), | |
1529 | .mode = 0644, | |
1530 | .proc_handler = proc_dointvec, | |
1531 | .extra1 = &zero, | |
1532 | }, | |
1533 | #endif | |
1534 | #ifdef CONFIG_NUMA | |
1535 | { | |
1536 | .procname = "zone_reclaim_mode", | |
1537 | .data = &node_reclaim_mode, | |
1538 | .maxlen = sizeof(node_reclaim_mode), | |
1539 | .mode = 0644, | |
1540 | .proc_handler = proc_dointvec, | |
1541 | .extra1 = &zero, | |
1542 | }, | |
1543 | { | |
1544 | .procname = "min_unmapped_ratio", | |
1545 | .data = &sysctl_min_unmapped_ratio, | |
1546 | .maxlen = sizeof(sysctl_min_unmapped_ratio), | |
1547 | .mode = 0644, | |
1548 | .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler, | |
1549 | .extra1 = &zero, | |
1550 | .extra2 = &one_hundred, | |
1551 | }, | |
1552 | { | |
1553 | .procname = "min_slab_ratio", | |
1554 | .data = &sysctl_min_slab_ratio, | |
1555 | .maxlen = sizeof(sysctl_min_slab_ratio), | |
1556 | .mode = 0644, | |
1557 | .proc_handler = sysctl_min_slab_ratio_sysctl_handler, | |
1558 | .extra1 = &zero, | |
1559 | .extra2 = &one_hundred, | |
1560 | }, | |
1561 | #endif | |
1562 | #ifdef CONFIG_SMP | |
1563 | { | |
1564 | .procname = "stat_interval", | |
1565 | .data = &sysctl_stat_interval, | |
1566 | .maxlen = sizeof(sysctl_stat_interval), | |
1567 | .mode = 0644, | |
1568 | .proc_handler = proc_dointvec_jiffies, | |
1569 | }, | |
1570 | { | |
1571 | .procname = "stat_refresh", | |
1572 | .data = NULL, | |
1573 | .maxlen = 0, | |
1574 | .mode = 0600, | |
1575 | .proc_handler = vmstat_refresh, | |
1576 | }, | |
1577 | #endif | |
1578 | #ifdef CONFIG_MMU | |
1579 | { | |
1580 | .procname = "mmap_min_addr", | |
1581 | .data = &dac_mmap_min_addr, | |
1582 | .maxlen = sizeof(unsigned long), | |
1583 | .mode = 0644, | |
1584 | .proc_handler = mmap_min_addr_handler, | |
1585 | }, | |
1586 | #endif | |
1587 | #ifdef CONFIG_NUMA | |
1588 | { | |
1589 | .procname = "numa_zonelist_order", | |
1590 | .data = &numa_zonelist_order, | |
1591 | .maxlen = NUMA_ZONELIST_ORDER_LEN, | |
1592 | .mode = 0644, | |
1593 | .proc_handler = numa_zonelist_order_handler, | |
1594 | }, | |
1595 | #endif | |
1596 | #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \ | |
1597 | (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL)) | |
1598 | { | |
1599 | .procname = "vdso_enabled", | |
1600 | #ifdef CONFIG_X86_32 | |
1601 | .data = &vdso32_enabled, | |
1602 | .maxlen = sizeof(vdso32_enabled), | |
1603 | #else | |
1604 | .data = &vdso_enabled, | |
1605 | .maxlen = sizeof(vdso_enabled), | |
1606 | #endif | |
1607 | .mode = 0644, | |
1608 | .proc_handler = proc_dointvec, | |
1609 | .extra1 = &zero, | |
1610 | }, | |
1611 | #endif | |
1612 | #ifdef CONFIG_HIGHMEM | |
1613 | { | |
1614 | .procname = "highmem_is_dirtyable", | |
1615 | .data = &vm_highmem_is_dirtyable, | |
1616 | .maxlen = sizeof(vm_highmem_is_dirtyable), | |
1617 | .mode = 0644, | |
1618 | .proc_handler = proc_dointvec_minmax, | |
1619 | .extra1 = &zero, | |
1620 | .extra2 = &one, | |
1621 | }, | |
1622 | #endif | |
1623 | #ifdef CONFIG_MEMORY_FAILURE | |
1624 | { | |
1625 | .procname = "memory_failure_early_kill", | |
1626 | .data = &sysctl_memory_failure_early_kill, | |
1627 | .maxlen = sizeof(sysctl_memory_failure_early_kill), | |
1628 | .mode = 0644, | |
1629 | .proc_handler = proc_dointvec_minmax, | |
1630 | .extra1 = &zero, | |
1631 | .extra2 = &one, | |
1632 | }, | |
1633 | { | |
1634 | .procname = "memory_failure_recovery", | |
1635 | .data = &sysctl_memory_failure_recovery, | |
1636 | .maxlen = sizeof(sysctl_memory_failure_recovery), | |
1637 | .mode = 0644, | |
1638 | .proc_handler = proc_dointvec_minmax, | |
1639 | .extra1 = &zero, | |
1640 | .extra2 = &one, | |
1641 | }, | |
1642 | #endif | |
1643 | { | |
1644 | .procname = "user_reserve_kbytes", | |
1645 | .data = &sysctl_user_reserve_kbytes, | |
1646 | .maxlen = sizeof(sysctl_user_reserve_kbytes), | |
1647 | .mode = 0644, | |
1648 | .proc_handler = proc_doulongvec_minmax, | |
1649 | }, | |
1650 | { | |
1651 | .procname = "admin_reserve_kbytes", | |
1652 | .data = &sysctl_admin_reserve_kbytes, | |
1653 | .maxlen = sizeof(sysctl_admin_reserve_kbytes), | |
1654 | .mode = 0644, | |
1655 | .proc_handler = proc_doulongvec_minmax, | |
1656 | }, | |
1657 | #ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS | |
1658 | { | |
1659 | .procname = "mmap_rnd_bits", | |
1660 | .data = &mmap_rnd_bits, | |
1661 | .maxlen = sizeof(mmap_rnd_bits), | |
1662 | .mode = 0600, | |
1663 | .proc_handler = proc_dointvec_minmax, | |
1664 | .extra1 = (void *)&mmap_rnd_bits_min, | |
1665 | .extra2 = (void *)&mmap_rnd_bits_max, | |
1666 | }, | |
1667 | #endif | |
1668 | #ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS | |
1669 | { | |
1670 | .procname = "mmap_rnd_compat_bits", | |
1671 | .data = &mmap_rnd_compat_bits, | |
1672 | .maxlen = sizeof(mmap_rnd_compat_bits), | |
1673 | .mode = 0600, | |
1674 | .proc_handler = proc_dointvec_minmax, | |
1675 | .extra1 = (void *)&mmap_rnd_compat_bits_min, | |
1676 | .extra2 = (void *)&mmap_rnd_compat_bits_max, | |
1677 | }, | |
1678 | #endif | |
1679 | { } | |
1680 | }; | |
1681 | ||
1682 | static struct ctl_table fs_table[] = { | |
1683 | { | |
1684 | .procname = "inode-nr", | |
1685 | .data = &inodes_stat, | |
1686 | .maxlen = 2*sizeof(long), | |
1687 | .mode = 0444, | |
1688 | .proc_handler = proc_nr_inodes, | |
1689 | }, | |
1690 | { | |
1691 | .procname = "inode-state", | |
1692 | .data = &inodes_stat, | |
1693 | .maxlen = 7*sizeof(long), | |
1694 | .mode = 0444, | |
1695 | .proc_handler = proc_nr_inodes, | |
1696 | }, | |
1697 | { | |
1698 | .procname = "file-nr", | |
1699 | .data = &files_stat, | |
1700 | .maxlen = sizeof(files_stat), | |
1701 | .mode = 0444, | |
1702 | .proc_handler = proc_nr_files, | |
1703 | }, | |
1704 | { | |
1705 | .procname = "file-max", | |
1706 | .data = &files_stat.max_files, | |
1707 | .maxlen = sizeof(files_stat.max_files), | |
1708 | .mode = 0644, | |
1709 | .proc_handler = proc_doulongvec_minmax, | |
1710 | }, | |
1711 | { | |
1712 | .procname = "nr_open", | |
1713 | .data = &sysctl_nr_open, | |
1714 | .maxlen = sizeof(unsigned int), | |
1715 | .mode = 0644, | |
1716 | .proc_handler = proc_dointvec_minmax, | |
1717 | .extra1 = &sysctl_nr_open_min, | |
1718 | .extra2 = &sysctl_nr_open_max, | |
1719 | }, | |
1720 | { | |
1721 | .procname = "dentry-state", | |
1722 | .data = &dentry_stat, | |
1723 | .maxlen = 6*sizeof(long), | |
1724 | .mode = 0444, | |
1725 | .proc_handler = proc_nr_dentry, | |
1726 | }, | |
1727 | { | |
1728 | .procname = "overflowuid", | |
1729 | .data = &fs_overflowuid, | |
1730 | .maxlen = sizeof(int), | |
1731 | .mode = 0644, | |
1732 | .proc_handler = proc_dointvec_minmax, | |
1733 | .extra1 = &minolduid, | |
1734 | .extra2 = &maxolduid, | |
1735 | }, | |
1736 | { | |
1737 | .procname = "overflowgid", | |
1738 | .data = &fs_overflowgid, | |
1739 | .maxlen = sizeof(int), | |
1740 | .mode = 0644, | |
1741 | .proc_handler = proc_dointvec_minmax, | |
1742 | .extra1 = &minolduid, | |
1743 | .extra2 = &maxolduid, | |
1744 | }, | |
1745 | #ifdef CONFIG_FILE_LOCKING | |
1746 | { | |
1747 | .procname = "leases-enable", | |
1748 | .data = &leases_enable, | |
1749 | .maxlen = sizeof(int), | |
1750 | .mode = 0644, | |
1751 | .proc_handler = proc_dointvec, | |
1752 | }, | |
1753 | #endif | |
1754 | #ifdef CONFIG_DNOTIFY | |
1755 | { | |
1756 | .procname = "dir-notify-enable", | |
1757 | .data = &dir_notify_enable, | |
1758 | .maxlen = sizeof(int), | |
1759 | .mode = 0644, | |
1760 | .proc_handler = proc_dointvec, | |
1761 | }, | |
1762 | #endif | |
1763 | #ifdef CONFIG_MMU | |
1764 | #ifdef CONFIG_FILE_LOCKING | |
1765 | { | |
1766 | .procname = "lease-break-time", | |
1767 | .data = &lease_break_time, | |
1768 | .maxlen = sizeof(int), | |
1769 | .mode = 0644, | |
1770 | .proc_handler = proc_dointvec, | |
1771 | }, | |
1772 | #endif | |
1773 | #ifdef CONFIG_AIO | |
1774 | { | |
1775 | .procname = "aio-nr", | |
1776 | .data = &aio_nr, | |
1777 | .maxlen = sizeof(aio_nr), | |
1778 | .mode = 0444, | |
1779 | .proc_handler = proc_doulongvec_minmax, | |
1780 | }, | |
1781 | { | |
1782 | .procname = "aio-max-nr", | |
1783 | .data = &aio_max_nr, | |
1784 | .maxlen = sizeof(aio_max_nr), | |
1785 | .mode = 0644, | |
1786 | .proc_handler = proc_doulongvec_minmax, | |
1787 | }, | |
1788 | #endif /* CONFIG_AIO */ | |
1789 | #ifdef CONFIG_INOTIFY_USER | |
1790 | { | |
1791 | .procname = "inotify", | |
1792 | .mode = 0555, | |
1793 | .child = inotify_table, | |
1794 | }, | |
1795 | #endif | |
1796 | #ifdef CONFIG_EPOLL | |
1797 | { | |
1798 | .procname = "epoll", | |
1799 | .mode = 0555, | |
1800 | .child = epoll_table, | |
1801 | }, | |
1802 | #endif | |
1803 | #endif | |
1804 | { | |
1805 | .procname = "protected_symlinks", | |
1806 | .data = &sysctl_protected_symlinks, | |
1807 | .maxlen = sizeof(int), | |
1808 | .mode = 0600, | |
1809 | .proc_handler = proc_dointvec_minmax, | |
1810 | .extra1 = &zero, | |
1811 | .extra2 = &one, | |
1812 | }, | |
1813 | { | |
1814 | .procname = "protected_hardlinks", | |
1815 | .data = &sysctl_protected_hardlinks, | |
1816 | .maxlen = sizeof(int), | |
1817 | .mode = 0600, | |
1818 | .proc_handler = proc_dointvec_minmax, | |
1819 | .extra1 = &zero, | |
1820 | .extra2 = &one, | |
1821 | }, | |
1822 | { | |
1823 | .procname = "protected_fifos", | |
1824 | .data = &sysctl_protected_fifos, | |
1825 | .maxlen = sizeof(int), | |
1826 | .mode = 0600, | |
1827 | .proc_handler = proc_dointvec_minmax, | |
1828 | .extra1 = &zero, | |
1829 | .extra2 = &two, | |
1830 | }, | |
1831 | { | |
1832 | .procname = "protected_regular", | |
1833 | .data = &sysctl_protected_regular, | |
1834 | .maxlen = sizeof(int), | |
1835 | .mode = 0600, | |
1836 | .proc_handler = proc_dointvec_minmax, | |
1837 | .extra1 = &zero, | |
1838 | .extra2 = &two, | |
1839 | }, | |
1840 | { | |
1841 | .procname = "suid_dumpable", | |
1842 | .data = &suid_dumpable, | |
1843 | .maxlen = sizeof(int), | |
1844 | .mode = 0644, | |
1845 | .proc_handler = proc_dointvec_minmax_coredump, | |
1846 | .extra1 = &zero, | |
1847 | .extra2 = &two, | |
1848 | }, | |
1849 | #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) | |
1850 | { | |
1851 | .procname = "binfmt_misc", | |
1852 | .mode = 0555, | |
1853 | .child = sysctl_mount_point, | |
1854 | }, | |
1855 | #endif | |
1856 | { | |
1857 | .procname = "pipe-max-size", | |
1858 | .data = &pipe_max_size, | |
1859 | .maxlen = sizeof(pipe_max_size), | |
1860 | .mode = 0644, | |
1861 | .proc_handler = proc_dopipe_max_size, | |
1862 | }, | |
1863 | { | |
1864 | .procname = "pipe-user-pages-hard", | |
1865 | .data = &pipe_user_pages_hard, | |
1866 | .maxlen = sizeof(pipe_user_pages_hard), | |
1867 | .mode = 0644, | |
1868 | .proc_handler = proc_doulongvec_minmax, | |
1869 | }, | |
1870 | { | |
1871 | .procname = "pipe-user-pages-soft", | |
1872 | .data = &pipe_user_pages_soft, | |
1873 | .maxlen = sizeof(pipe_user_pages_soft), | |
1874 | .mode = 0644, | |
1875 | .proc_handler = proc_doulongvec_minmax, | |
1876 | }, | |
1877 | { | |
1878 | .procname = "mount-max", | |
1879 | .data = &sysctl_mount_max, | |
1880 | .maxlen = sizeof(unsigned int), | |
1881 | .mode = 0644, | |
1882 | .proc_handler = proc_dointvec_minmax, | |
1883 | .extra1 = &one, | |
1884 | }, | |
1885 | { } | |
1886 | }; | |
1887 | ||
1888 | static struct ctl_table debug_table[] = { | |
1889 | #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE | |
1890 | { | |
1891 | .procname = "exception-trace", | |
1892 | .data = &show_unhandled_signals, | |
1893 | .maxlen = sizeof(int), | |
1894 | .mode = 0644, | |
1895 | .proc_handler = proc_dointvec | |
1896 | }, | |
1897 | #endif | |
1898 | #if defined(CONFIG_OPTPROBES) | |
1899 | { | |
1900 | .procname = "kprobes-optimization", | |
1901 | .data = &sysctl_kprobes_optimization, | |
1902 | .maxlen = sizeof(int), | |
1903 | .mode = 0644, | |
1904 | .proc_handler = proc_kprobes_optimization_handler, | |
1905 | .extra1 = &zero, | |
1906 | .extra2 = &one, | |
1907 | }, | |
1908 | #endif | |
1909 | { } | |
1910 | }; | |
1911 | ||
1912 | static struct ctl_table dev_table[] = { | |
1913 | { } | |
1914 | }; | |
1915 | ||
1916 | int __init sysctl_init(void) | |
1917 | { | |
1918 | struct ctl_table_header *hdr; | |
1919 | ||
1920 | hdr = register_sysctl_table(sysctl_base_table); | |
1921 | kmemleak_not_leak(hdr); | |
1922 | return 0; | |
1923 | } | |
1924 | ||
1925 | #endif /* CONFIG_SYSCTL */ | |
1926 | ||
1927 | /* | |
1928 | * /proc/sys support | |
1929 | */ | |
1930 | ||
1931 | #ifdef CONFIG_PROC_SYSCTL | |
1932 | ||
1933 | static int _proc_do_string(char *data, int maxlen, int write, | |
1934 | char __user *buffer, | |
1935 | size_t *lenp, loff_t *ppos) | |
1936 | { | |
1937 | size_t len; | |
1938 | char __user *p; | |
1939 | char c; | |
1940 | ||
1941 | if (!data || !maxlen || !*lenp) { | |
1942 | *lenp = 0; | |
1943 | return 0; | |
1944 | } | |
1945 | ||
1946 | if (write) { | |
1947 | if (sysctl_writes_strict == SYSCTL_WRITES_STRICT) { | |
1948 | /* Only continue writes not past the end of buffer. */ | |
1949 | len = strlen(data); | |
1950 | if (len > maxlen - 1) | |
1951 | len = maxlen - 1; | |
1952 | ||
1953 | if (*ppos > len) | |
1954 | return 0; | |
1955 | len = *ppos; | |
1956 | } else { | |
1957 | /* Start writing from beginning of buffer. */ | |
1958 | len = 0; | |
1959 | } | |
1960 | ||
1961 | *ppos += *lenp; | |
1962 | p = buffer; | |
1963 | while ((p - buffer) < *lenp && len < maxlen - 1) { | |
1964 | if (get_user(c, p++)) | |
1965 | return -EFAULT; | |
1966 | if (c == 0 || c == '\n') | |
1967 | break; | |
1968 | data[len++] = c; | |
1969 | } | |
1970 | data[len] = 0; | |
1971 | } else { | |
1972 | len = strlen(data); | |
1973 | if (len > maxlen) | |
1974 | len = maxlen; | |
1975 | ||
1976 | if (*ppos > len) { | |
1977 | *lenp = 0; | |
1978 | return 0; | |
1979 | } | |
1980 | ||
1981 | data += *ppos; | |
1982 | len -= *ppos; | |
1983 | ||
1984 | if (len > *lenp) | |
1985 | len = *lenp; | |
1986 | if (len) | |
1987 | if (copy_to_user(buffer, data, len)) | |
1988 | return -EFAULT; | |
1989 | if (len < *lenp) { | |
1990 | if (put_user('\n', buffer + len)) | |
1991 | return -EFAULT; | |
1992 | len++; | |
1993 | } | |
1994 | *lenp = len; | |
1995 | *ppos += len; | |
1996 | } | |
1997 | return 0; | |
1998 | } | |
1999 | ||
2000 | static void warn_sysctl_write(struct ctl_table *table) | |
2001 | { | |
2002 | pr_warn_once("%s wrote to %s when file position was not 0!\n" | |
2003 | "This will not be supported in the future. To silence this\n" | |
2004 | "warning, set kernel.sysctl_writes_strict = -1\n", | |
2005 | current->comm, table->procname); | |
2006 | } | |
2007 | ||
2008 | /** | |
2009 | * proc_first_pos_non_zero_ignore - check if first position is allowed | |
2010 | * @ppos: file position | |
2011 | * @table: the sysctl table | |
2012 | * | |
2013 | * Returns true if the first position is non-zero and the sysctl_writes_strict | |
2014 | * mode indicates this is not allowed for numeric input types. String proc | |
2015 | * handlers can ignore the return value. | |
2016 | */ | |
2017 | static bool proc_first_pos_non_zero_ignore(loff_t *ppos, | |
2018 | struct ctl_table *table) | |
2019 | { | |
2020 | if (!*ppos) | |
2021 | return false; | |
2022 | ||
2023 | switch (sysctl_writes_strict) { | |
2024 | case SYSCTL_WRITES_STRICT: | |
2025 | return true; | |
2026 | case SYSCTL_WRITES_WARN: | |
2027 | warn_sysctl_write(table); | |
2028 | return false; | |
2029 | default: | |
2030 | return false; | |
2031 | } | |
2032 | } | |
2033 | ||
2034 | /** | |
2035 | * proc_dostring - read a string sysctl | |
2036 | * @table: the sysctl table | |
2037 | * @write: %TRUE if this is a write to the sysctl file | |
2038 | * @buffer: the user buffer | |
2039 | * @lenp: the size of the user buffer | |
2040 | * @ppos: file position | |
2041 | * | |
2042 | * Reads/writes a string from/to the user buffer. If the kernel | |
2043 | * buffer provided is not large enough to hold the string, the | |
2044 | * string is truncated. The copied string is %NULL-terminated. | |
2045 | * If the string is being read by the user process, it is copied | |
2046 | * and a newline '\n' is added. It is truncated if the buffer is | |
2047 | * not large enough. | |
2048 | * | |
2049 | * Returns 0 on success. | |
2050 | */ | |
2051 | int proc_dostring(struct ctl_table *table, int write, | |
2052 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2053 | { | |
2054 | if (write) | |
2055 | proc_first_pos_non_zero_ignore(ppos, table); | |
2056 | ||
2057 | return _proc_do_string((char *)(table->data), table->maxlen, write, | |
2058 | (char __user *)buffer, lenp, ppos); | |
2059 | } | |
2060 | ||
2061 | static size_t proc_skip_spaces(char **buf) | |
2062 | { | |
2063 | size_t ret; | |
2064 | char *tmp = skip_spaces(*buf); | |
2065 | ret = tmp - *buf; | |
2066 | *buf = tmp; | |
2067 | return ret; | |
2068 | } | |
2069 | ||
2070 | static void proc_skip_char(char **buf, size_t *size, const char v) | |
2071 | { | |
2072 | while (*size) { | |
2073 | if (**buf != v) | |
2074 | break; | |
2075 | (*size)--; | |
2076 | (*buf)++; | |
2077 | } | |
2078 | } | |
2079 | ||
2080 | #define TMPBUFLEN 22 | |
2081 | /** | |
2082 | * proc_get_long - reads an ASCII formatted integer from a user buffer | |
2083 | * | |
2084 | * @buf: a kernel buffer | |
2085 | * @size: size of the kernel buffer | |
2086 | * @val: this is where the number will be stored | |
2087 | * @neg: set to %TRUE if number is negative | |
2088 | * @perm_tr: a vector which contains the allowed trailers | |
2089 | * @perm_tr_len: size of the perm_tr vector | |
2090 | * @tr: pointer to store the trailer character | |
2091 | * | |
2092 | * In case of success %0 is returned and @buf and @size are updated with | |
2093 | * the amount of bytes read. If @tr is non-NULL and a trailing | |
2094 | * character exists (size is non-zero after returning from this | |
2095 | * function), @tr is updated with the trailing character. | |
2096 | */ | |
2097 | static int proc_get_long(char **buf, size_t *size, | |
2098 | unsigned long *val, bool *neg, | |
2099 | const char *perm_tr, unsigned perm_tr_len, char *tr) | |
2100 | { | |
2101 | int len; | |
2102 | char *p, tmp[TMPBUFLEN]; | |
2103 | ||
2104 | if (!*size) | |
2105 | return -EINVAL; | |
2106 | ||
2107 | len = *size; | |
2108 | if (len > TMPBUFLEN - 1) | |
2109 | len = TMPBUFLEN - 1; | |
2110 | ||
2111 | memcpy(tmp, *buf, len); | |
2112 | ||
2113 | tmp[len] = 0; | |
2114 | p = tmp; | |
2115 | if (*p == '-' && *size > 1) { | |
2116 | *neg = true; | |
2117 | p++; | |
2118 | } else | |
2119 | *neg = false; | |
2120 | if (!isdigit(*p)) | |
2121 | return -EINVAL; | |
2122 | ||
2123 | *val = simple_strtoul(p, &p, 0); | |
2124 | ||
2125 | len = p - tmp; | |
2126 | ||
2127 | /* We don't know if the next char is whitespace thus we may accept | |
2128 | * invalid integers (e.g. 1234...a) or two integers instead of one | |
2129 | * (e.g. 123...1). So lets not allow such large numbers. */ | |
2130 | if (len == TMPBUFLEN - 1) | |
2131 | return -EINVAL; | |
2132 | ||
2133 | if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len)) | |
2134 | return -EINVAL; | |
2135 | ||
2136 | if (tr && (len < *size)) | |
2137 | *tr = *p; | |
2138 | ||
2139 | *buf += len; | |
2140 | *size -= len; | |
2141 | ||
2142 | return 0; | |
2143 | } | |
2144 | ||
2145 | /** | |
2146 | * proc_put_long - converts an integer to a decimal ASCII formatted string | |
2147 | * | |
2148 | * @buf: the user buffer | |
2149 | * @size: the size of the user buffer | |
2150 | * @val: the integer to be converted | |
2151 | * @neg: sign of the number, %TRUE for negative | |
2152 | * | |
2153 | * In case of success %0 is returned and @buf and @size are updated with | |
2154 | * the amount of bytes written. | |
2155 | */ | |
2156 | static int proc_put_long(void __user **buf, size_t *size, unsigned long val, | |
2157 | bool neg) | |
2158 | { | |
2159 | int len; | |
2160 | char tmp[TMPBUFLEN], *p = tmp; | |
2161 | ||
2162 | sprintf(p, "%s%lu", neg ? "-" : "", val); | |
2163 | len = strlen(tmp); | |
2164 | if (len > *size) | |
2165 | len = *size; | |
2166 | if (copy_to_user(*buf, tmp, len)) | |
2167 | return -EFAULT; | |
2168 | *size -= len; | |
2169 | *buf += len; | |
2170 | return 0; | |
2171 | } | |
2172 | #undef TMPBUFLEN | |
2173 | ||
2174 | static int proc_put_char(void __user **buf, size_t *size, char c) | |
2175 | { | |
2176 | if (*size) { | |
2177 | char __user **buffer = (char __user **)buf; | |
2178 | if (put_user(c, *buffer)) | |
2179 | return -EFAULT; | |
2180 | (*size)--, (*buffer)++; | |
2181 | *buf = *buffer; | |
2182 | } | |
2183 | return 0; | |
2184 | } | |
2185 | ||
2186 | static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp, | |
2187 | int *valp, | |
2188 | int write, void *data) | |
2189 | { | |
2190 | if (write) { | |
2191 | if (*negp) { | |
2192 | if (*lvalp > (unsigned long) INT_MAX + 1) | |
2193 | return -EINVAL; | |
2194 | *valp = -*lvalp; | |
2195 | } else { | |
2196 | if (*lvalp > (unsigned long) INT_MAX) | |
2197 | return -EINVAL; | |
2198 | *valp = *lvalp; | |
2199 | } | |
2200 | } else { | |
2201 | int val = *valp; | |
2202 | if (val < 0) { | |
2203 | *negp = true; | |
2204 | *lvalp = -(unsigned long)val; | |
2205 | } else { | |
2206 | *negp = false; | |
2207 | *lvalp = (unsigned long)val; | |
2208 | } | |
2209 | } | |
2210 | return 0; | |
2211 | } | |
2212 | ||
2213 | static int do_proc_douintvec_conv(unsigned long *lvalp, | |
2214 | unsigned int *valp, | |
2215 | int write, void *data) | |
2216 | { | |
2217 | if (write) { | |
2218 | if (*lvalp > UINT_MAX) | |
2219 | return -EINVAL; | |
2220 | *valp = *lvalp; | |
2221 | } else { | |
2222 | unsigned int val = *valp; | |
2223 | *lvalp = (unsigned long)val; | |
2224 | } | |
2225 | return 0; | |
2226 | } | |
2227 | ||
2228 | static const char proc_wspace_sep[] = { ' ', '\t', '\n' }; | |
2229 | ||
2230 | static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table, | |
2231 | int write, void __user *buffer, | |
2232 | size_t *lenp, loff_t *ppos, | |
2233 | int (*conv)(bool *negp, unsigned long *lvalp, int *valp, | |
2234 | int write, void *data), | |
2235 | void *data) | |
2236 | { | |
2237 | int *i, vleft, first = 1, err = 0; | |
2238 | size_t left; | |
2239 | char *kbuf = NULL, *p; | |
2240 | ||
2241 | if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) { | |
2242 | *lenp = 0; | |
2243 | return 0; | |
2244 | } | |
2245 | ||
2246 | i = (int *) tbl_data; | |
2247 | vleft = table->maxlen / sizeof(*i); | |
2248 | left = *lenp; | |
2249 | ||
2250 | if (!conv) | |
2251 | conv = do_proc_dointvec_conv; | |
2252 | ||
2253 | if (write) { | |
2254 | if (proc_first_pos_non_zero_ignore(ppos, table)) | |
2255 | goto out; | |
2256 | ||
2257 | if (left > PAGE_SIZE - 1) | |
2258 | left = PAGE_SIZE - 1; | |
2259 | p = kbuf = memdup_user_nul(buffer, left); | |
2260 | if (IS_ERR(kbuf)) | |
2261 | return PTR_ERR(kbuf); | |
2262 | } | |
2263 | ||
2264 | for (; left && vleft--; i++, first=0) { | |
2265 | unsigned long lval; | |
2266 | bool neg; | |
2267 | ||
2268 | if (write) { | |
2269 | left -= proc_skip_spaces(&p); | |
2270 | ||
2271 | if (!left) | |
2272 | break; | |
2273 | err = proc_get_long(&p, &left, &lval, &neg, | |
2274 | proc_wspace_sep, | |
2275 | sizeof(proc_wspace_sep), NULL); | |
2276 | if (err) | |
2277 | break; | |
2278 | if (conv(&neg, &lval, i, 1, data)) { | |
2279 | err = -EINVAL; | |
2280 | break; | |
2281 | } | |
2282 | } else { | |
2283 | if (conv(&neg, &lval, i, 0, data)) { | |
2284 | err = -EINVAL; | |
2285 | break; | |
2286 | } | |
2287 | if (!first) | |
2288 | err = proc_put_char(&buffer, &left, '\t'); | |
2289 | if (err) | |
2290 | break; | |
2291 | err = proc_put_long(&buffer, &left, lval, neg); | |
2292 | if (err) | |
2293 | break; | |
2294 | } | |
2295 | } | |
2296 | ||
2297 | if (!write && !first && left && !err) | |
2298 | err = proc_put_char(&buffer, &left, '\n'); | |
2299 | if (write && !err && left) | |
2300 | left -= proc_skip_spaces(&p); | |
2301 | if (write) { | |
2302 | kfree(kbuf); | |
2303 | if (first) | |
2304 | return err ? : -EINVAL; | |
2305 | } | |
2306 | *lenp -= left; | |
2307 | out: | |
2308 | *ppos += *lenp; | |
2309 | return err; | |
2310 | } | |
2311 | ||
2312 | static int do_proc_dointvec(struct ctl_table *table, int write, | |
2313 | void __user *buffer, size_t *lenp, loff_t *ppos, | |
2314 | int (*conv)(bool *negp, unsigned long *lvalp, int *valp, | |
2315 | int write, void *data), | |
2316 | void *data) | |
2317 | { | |
2318 | return __do_proc_dointvec(table->data, table, write, | |
2319 | buffer, lenp, ppos, conv, data); | |
2320 | } | |
2321 | ||
2322 | static int do_proc_douintvec_w(unsigned int *tbl_data, | |
2323 | struct ctl_table *table, | |
2324 | void __user *buffer, | |
2325 | size_t *lenp, loff_t *ppos, | |
2326 | int (*conv)(unsigned long *lvalp, | |
2327 | unsigned int *valp, | |
2328 | int write, void *data), | |
2329 | void *data) | |
2330 | { | |
2331 | unsigned long lval; | |
2332 | int err = 0; | |
2333 | size_t left; | |
2334 | bool neg; | |
2335 | char *kbuf = NULL, *p; | |
2336 | ||
2337 | left = *lenp; | |
2338 | ||
2339 | if (proc_first_pos_non_zero_ignore(ppos, table)) | |
2340 | goto bail_early; | |
2341 | ||
2342 | if (left > PAGE_SIZE - 1) | |
2343 | left = PAGE_SIZE - 1; | |
2344 | ||
2345 | p = kbuf = memdup_user_nul(buffer, left); | |
2346 | if (IS_ERR(kbuf)) | |
2347 | return -EINVAL; | |
2348 | ||
2349 | left -= proc_skip_spaces(&p); | |
2350 | if (!left) { | |
2351 | err = -EINVAL; | |
2352 | goto out_free; | |
2353 | } | |
2354 | ||
2355 | err = proc_get_long(&p, &left, &lval, &neg, | |
2356 | proc_wspace_sep, | |
2357 | sizeof(proc_wspace_sep), NULL); | |
2358 | if (err || neg) { | |
2359 | err = -EINVAL; | |
2360 | goto out_free; | |
2361 | } | |
2362 | ||
2363 | if (conv(&lval, tbl_data, 1, data)) { | |
2364 | err = -EINVAL; | |
2365 | goto out_free; | |
2366 | } | |
2367 | ||
2368 | if (!err && left) | |
2369 | left -= proc_skip_spaces(&p); | |
2370 | ||
2371 | out_free: | |
2372 | kfree(kbuf); | |
2373 | if (err) | |
2374 | return -EINVAL; | |
2375 | ||
2376 | return 0; | |
2377 | ||
2378 | /* This is in keeping with old __do_proc_dointvec() */ | |
2379 | bail_early: | |
2380 | *ppos += *lenp; | |
2381 | return err; | |
2382 | } | |
2383 | ||
2384 | static int do_proc_douintvec_r(unsigned int *tbl_data, void __user *buffer, | |
2385 | size_t *lenp, loff_t *ppos, | |
2386 | int (*conv)(unsigned long *lvalp, | |
2387 | unsigned int *valp, | |
2388 | int write, void *data), | |
2389 | void *data) | |
2390 | { | |
2391 | unsigned long lval; | |
2392 | int err = 0; | |
2393 | size_t left; | |
2394 | ||
2395 | left = *lenp; | |
2396 | ||
2397 | if (conv(&lval, tbl_data, 0, data)) { | |
2398 | err = -EINVAL; | |
2399 | goto out; | |
2400 | } | |
2401 | ||
2402 | err = proc_put_long(&buffer, &left, lval, false); | |
2403 | if (err || !left) | |
2404 | goto out; | |
2405 | ||
2406 | err = proc_put_char(&buffer, &left, '\n'); | |
2407 | ||
2408 | out: | |
2409 | *lenp -= left; | |
2410 | *ppos += *lenp; | |
2411 | ||
2412 | return err; | |
2413 | } | |
2414 | ||
2415 | static int __do_proc_douintvec(void *tbl_data, struct ctl_table *table, | |
2416 | int write, void __user *buffer, | |
2417 | size_t *lenp, loff_t *ppos, | |
2418 | int (*conv)(unsigned long *lvalp, | |
2419 | unsigned int *valp, | |
2420 | int write, void *data), | |
2421 | void *data) | |
2422 | { | |
2423 | unsigned int *i, vleft; | |
2424 | ||
2425 | if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) { | |
2426 | *lenp = 0; | |
2427 | return 0; | |
2428 | } | |
2429 | ||
2430 | i = (unsigned int *) tbl_data; | |
2431 | vleft = table->maxlen / sizeof(*i); | |
2432 | ||
2433 | /* | |
2434 | * Arrays are not supported, keep this simple. *Do not* add | |
2435 | * support for them. | |
2436 | */ | |
2437 | if (vleft != 1) { | |
2438 | *lenp = 0; | |
2439 | return -EINVAL; | |
2440 | } | |
2441 | ||
2442 | if (!conv) | |
2443 | conv = do_proc_douintvec_conv; | |
2444 | ||
2445 | if (write) | |
2446 | return do_proc_douintvec_w(i, table, buffer, lenp, ppos, | |
2447 | conv, data); | |
2448 | return do_proc_douintvec_r(i, buffer, lenp, ppos, conv, data); | |
2449 | } | |
2450 | ||
2451 | static int do_proc_douintvec(struct ctl_table *table, int write, | |
2452 | void __user *buffer, size_t *lenp, loff_t *ppos, | |
2453 | int (*conv)(unsigned long *lvalp, | |
2454 | unsigned int *valp, | |
2455 | int write, void *data), | |
2456 | void *data) | |
2457 | { | |
2458 | return __do_proc_douintvec(table->data, table, write, | |
2459 | buffer, lenp, ppos, conv, data); | |
2460 | } | |
2461 | ||
2462 | /** | |
2463 | * proc_dointvec - read a vector of integers | |
2464 | * @table: the sysctl table | |
2465 | * @write: %TRUE if this is a write to the sysctl file | |
2466 | * @buffer: the user buffer | |
2467 | * @lenp: the size of the user buffer | |
2468 | * @ppos: file position | |
2469 | * | |
2470 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer | |
2471 | * values from/to the user buffer, treated as an ASCII string. | |
2472 | * | |
2473 | * Returns 0 on success. | |
2474 | */ | |
2475 | int proc_dointvec(struct ctl_table *table, int write, | |
2476 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2477 | { | |
2478 | return do_proc_dointvec(table, write, buffer, lenp, ppos, NULL, NULL); | |
2479 | } | |
2480 | ||
2481 | /** | |
2482 | * proc_douintvec - read a vector of unsigned integers | |
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: file position | |
2488 | * | |
2489 | * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer | |
2490 | * values from/to the user buffer, treated as an ASCII string. | |
2491 | * | |
2492 | * Returns 0 on success. | |
2493 | */ | |
2494 | int proc_douintvec(struct ctl_table *table, int write, | |
2495 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2496 | { | |
2497 | return do_proc_douintvec(table, write, buffer, lenp, ppos, | |
2498 | do_proc_douintvec_conv, NULL); | |
2499 | } | |
2500 | ||
2501 | /* | |
2502 | * Taint values can only be increased | |
2503 | * This means we can safely use a temporary. | |
2504 | */ | |
2505 | static int proc_taint(struct ctl_table *table, int write, | |
2506 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2507 | { | |
2508 | struct ctl_table t; | |
2509 | unsigned long tmptaint = get_taint(); | |
2510 | int err; | |
2511 | ||
2512 | if (write && !capable(CAP_SYS_ADMIN)) | |
2513 | return -EPERM; | |
2514 | ||
2515 | t = *table; | |
2516 | t.data = &tmptaint; | |
2517 | err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos); | |
2518 | if (err < 0) | |
2519 | return err; | |
2520 | ||
2521 | if (write) { | |
2522 | /* | |
2523 | * Poor man's atomic or. Not worth adding a primitive | |
2524 | * to everyone's atomic.h for this | |
2525 | */ | |
2526 | int i; | |
2527 | for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) { | |
2528 | if ((tmptaint >> i) & 1) | |
2529 | add_taint(i, LOCKDEP_STILL_OK); | |
2530 | } | |
2531 | } | |
2532 | ||
2533 | return err; | |
2534 | } | |
2535 | ||
2536 | #ifdef CONFIG_PRINTK | |
2537 | static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write, | |
2538 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2539 | { | |
2540 | if (write && !capable(CAP_SYS_ADMIN)) | |
2541 | return -EPERM; | |
2542 | ||
2543 | return proc_dointvec_minmax(table, write, buffer, lenp, ppos); | |
2544 | } | |
2545 | #endif | |
2546 | ||
2547 | /** | |
2548 | * struct do_proc_dointvec_minmax_conv_param - proc_dointvec_minmax() range checking structure | |
2549 | * @min: pointer to minimum allowable value | |
2550 | * @max: pointer to maximum allowable value | |
2551 | * | |
2552 | * The do_proc_dointvec_minmax_conv_param structure provides the | |
2553 | * minimum and maximum values for doing range checking for those sysctl | |
2554 | * parameters that use the proc_dointvec_minmax() handler. | |
2555 | */ | |
2556 | struct do_proc_dointvec_minmax_conv_param { | |
2557 | int *min; | |
2558 | int *max; | |
2559 | }; | |
2560 | ||
2561 | static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp, | |
2562 | int *valp, | |
2563 | int write, void *data) | |
2564 | { | |
2565 | struct do_proc_dointvec_minmax_conv_param *param = data; | |
2566 | if (write) { | |
2567 | int val = *negp ? -*lvalp : *lvalp; | |
2568 | if ((param->min && *param->min > val) || | |
2569 | (param->max && *param->max < val)) | |
2570 | return -EINVAL; | |
2571 | *valp = val; | |
2572 | } else { | |
2573 | int val = *valp; | |
2574 | if (val < 0) { | |
2575 | *negp = true; | |
2576 | *lvalp = -(unsigned long)val; | |
2577 | } else { | |
2578 | *negp = false; | |
2579 | *lvalp = (unsigned long)val; | |
2580 | } | |
2581 | } | |
2582 | return 0; | |
2583 | } | |
2584 | ||
2585 | /** | |
2586 | * proc_dointvec_minmax - read a vector of integers with min/max values | |
2587 | * @table: the sysctl table | |
2588 | * @write: %TRUE if this is a write to the sysctl file | |
2589 | * @buffer: the user buffer | |
2590 | * @lenp: the size of the user buffer | |
2591 | * @ppos: file position | |
2592 | * | |
2593 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer | |
2594 | * values from/to the user buffer, treated as an ASCII string. | |
2595 | * | |
2596 | * This routine will ensure the values are within the range specified by | |
2597 | * table->extra1 (min) and table->extra2 (max). | |
2598 | * | |
2599 | * Returns 0 on success or -EINVAL on write when the range check fails. | |
2600 | */ | |
2601 | int proc_dointvec_minmax(struct ctl_table *table, int write, | |
2602 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2603 | { | |
2604 | struct do_proc_dointvec_minmax_conv_param param = { | |
2605 | .min = (int *) table->extra1, | |
2606 | .max = (int *) table->extra2, | |
2607 | }; | |
2608 | return do_proc_dointvec(table, write, buffer, lenp, ppos, | |
2609 | do_proc_dointvec_minmax_conv, ¶m); | |
2610 | } | |
2611 | ||
2612 | /** | |
2613 | * struct do_proc_douintvec_minmax_conv_param - proc_douintvec_minmax() range checking structure | |
2614 | * @min: pointer to minimum allowable value | |
2615 | * @max: pointer to maximum allowable value | |
2616 | * | |
2617 | * The do_proc_douintvec_minmax_conv_param structure provides the | |
2618 | * minimum and maximum values for doing range checking for those sysctl | |
2619 | * parameters that use the proc_douintvec_minmax() handler. | |
2620 | */ | |
2621 | struct do_proc_douintvec_minmax_conv_param { | |
2622 | unsigned int *min; | |
2623 | unsigned int *max; | |
2624 | }; | |
2625 | ||
2626 | static int do_proc_douintvec_minmax_conv(unsigned long *lvalp, | |
2627 | unsigned int *valp, | |
2628 | int write, void *data) | |
2629 | { | |
2630 | struct do_proc_douintvec_minmax_conv_param *param = data; | |
2631 | ||
2632 | if (write) { | |
2633 | unsigned int val = *lvalp; | |
2634 | ||
2635 | if (*lvalp > UINT_MAX) | |
2636 | return -EINVAL; | |
2637 | ||
2638 | if ((param->min && *param->min > val) || | |
2639 | (param->max && *param->max < val)) | |
2640 | return -ERANGE; | |
2641 | ||
2642 | *valp = val; | |
2643 | } else { | |
2644 | unsigned int val = *valp; | |
2645 | *lvalp = (unsigned long) val; | |
2646 | } | |
2647 | ||
2648 | return 0; | |
2649 | } | |
2650 | ||
2651 | /** | |
2652 | * proc_douintvec_minmax - read a vector of unsigned ints with min/max values | |
2653 | * @table: the sysctl table | |
2654 | * @write: %TRUE if this is a write to the sysctl file | |
2655 | * @buffer: the user buffer | |
2656 | * @lenp: the size of the user buffer | |
2657 | * @ppos: file position | |
2658 | * | |
2659 | * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer | |
2660 | * values from/to the user buffer, treated as an ASCII string. Negative | |
2661 | * strings are not allowed. | |
2662 | * | |
2663 | * This routine will ensure the values are within the range specified by | |
2664 | * table->extra1 (min) and table->extra2 (max). There is a final sanity | |
2665 | * check for UINT_MAX to avoid having to support wrap around uses from | |
2666 | * userspace. | |
2667 | * | |
2668 | * Returns 0 on success or -ERANGE on write when the range check fails. | |
2669 | */ | |
2670 | int proc_douintvec_minmax(struct ctl_table *table, int write, | |
2671 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2672 | { | |
2673 | struct do_proc_douintvec_minmax_conv_param param = { | |
2674 | .min = (unsigned int *) table->extra1, | |
2675 | .max = (unsigned int *) table->extra2, | |
2676 | }; | |
2677 | return do_proc_douintvec(table, write, buffer, lenp, ppos, | |
2678 | do_proc_douintvec_minmax_conv, ¶m); | |
2679 | } | |
2680 | ||
2681 | static int do_proc_dopipe_max_size_conv(unsigned long *lvalp, | |
2682 | unsigned int *valp, | |
2683 | int write, void *data) | |
2684 | { | |
2685 | if (write) { | |
2686 | unsigned int val; | |
2687 | ||
2688 | val = round_pipe_size(*lvalp); | |
2689 | if (val == 0) | |
2690 | return -EINVAL; | |
2691 | ||
2692 | *valp = val; | |
2693 | } else { | |
2694 | unsigned int val = *valp; | |
2695 | *lvalp = (unsigned long) val; | |
2696 | } | |
2697 | ||
2698 | return 0; | |
2699 | } | |
2700 | ||
2701 | static int proc_dopipe_max_size(struct ctl_table *table, int write, | |
2702 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2703 | { | |
2704 | return do_proc_douintvec(table, write, buffer, lenp, ppos, | |
2705 | do_proc_dopipe_max_size_conv, NULL); | |
2706 | } | |
2707 | ||
2708 | static void validate_coredump_safety(void) | |
2709 | { | |
2710 | #ifdef CONFIG_COREDUMP | |
2711 | if (suid_dumpable == SUID_DUMP_ROOT && | |
2712 | core_pattern[0] != '/' && core_pattern[0] != '|') { | |
2713 | printk(KERN_WARNING | |
2714 | "Unsafe core_pattern used with fs.suid_dumpable=2.\n" | |
2715 | "Pipe handler or fully qualified core dump path required.\n" | |
2716 | "Set kernel.core_pattern before fs.suid_dumpable.\n" | |
2717 | ); | |
2718 | } | |
2719 | #endif | |
2720 | } | |
2721 | ||
2722 | static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write, | |
2723 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2724 | { | |
2725 | int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos); | |
2726 | if (!error) | |
2727 | validate_coredump_safety(); | |
2728 | return error; | |
2729 | } | |
2730 | ||
2731 | #ifdef CONFIG_COREDUMP | |
2732 | static int proc_dostring_coredump(struct ctl_table *table, int write, | |
2733 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2734 | { | |
2735 | int error = proc_dostring(table, write, buffer, lenp, ppos); | |
2736 | if (!error) | |
2737 | validate_coredump_safety(); | |
2738 | return error; | |
2739 | } | |
2740 | #endif | |
2741 | ||
2742 | static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write, | |
2743 | void __user *buffer, | |
2744 | size_t *lenp, loff_t *ppos, | |
2745 | unsigned long convmul, | |
2746 | unsigned long convdiv) | |
2747 | { | |
2748 | unsigned long *i, *min, *max; | |
2749 | int vleft, first = 1, err = 0; | |
2750 | size_t left; | |
2751 | char *kbuf = NULL, *p; | |
2752 | ||
2753 | if (!data || !table->maxlen || !*lenp || (*ppos && !write)) { | |
2754 | *lenp = 0; | |
2755 | return 0; | |
2756 | } | |
2757 | ||
2758 | i = (unsigned long *) data; | |
2759 | min = (unsigned long *) table->extra1; | |
2760 | max = (unsigned long *) table->extra2; | |
2761 | vleft = table->maxlen / sizeof(unsigned long); | |
2762 | left = *lenp; | |
2763 | ||
2764 | if (write) { | |
2765 | if (proc_first_pos_non_zero_ignore(ppos, table)) | |
2766 | goto out; | |
2767 | ||
2768 | if (left > PAGE_SIZE - 1) | |
2769 | left = PAGE_SIZE - 1; | |
2770 | p = kbuf = memdup_user_nul(buffer, left); | |
2771 | if (IS_ERR(kbuf)) | |
2772 | return PTR_ERR(kbuf); | |
2773 | } | |
2774 | ||
2775 | for (; left && vleft--; i++, first = 0) { | |
2776 | unsigned long val; | |
2777 | ||
2778 | if (write) { | |
2779 | bool neg; | |
2780 | ||
2781 | left -= proc_skip_spaces(&p); | |
2782 | ||
2783 | err = proc_get_long(&p, &left, &val, &neg, | |
2784 | proc_wspace_sep, | |
2785 | sizeof(proc_wspace_sep), NULL); | |
2786 | if (err) | |
2787 | break; | |
2788 | if (neg) | |
2789 | continue; | |
2790 | val = convmul * val / convdiv; | |
2791 | if ((min && val < *min) || (max && val > *max)) | |
2792 | continue; | |
2793 | *i = val; | |
2794 | } else { | |
2795 | val = convdiv * (*i) / convmul; | |
2796 | if (!first) { | |
2797 | err = proc_put_char(&buffer, &left, '\t'); | |
2798 | if (err) | |
2799 | break; | |
2800 | } | |
2801 | err = proc_put_long(&buffer, &left, val, false); | |
2802 | if (err) | |
2803 | break; | |
2804 | } | |
2805 | } | |
2806 | ||
2807 | if (!write && !first && left && !err) | |
2808 | err = proc_put_char(&buffer, &left, '\n'); | |
2809 | if (write && !err) | |
2810 | left -= proc_skip_spaces(&p); | |
2811 | if (write) { | |
2812 | kfree(kbuf); | |
2813 | if (first) | |
2814 | return err ? : -EINVAL; | |
2815 | } | |
2816 | *lenp -= left; | |
2817 | out: | |
2818 | *ppos += *lenp; | |
2819 | return err; | |
2820 | } | |
2821 | ||
2822 | static int do_proc_doulongvec_minmax(struct ctl_table *table, int write, | |
2823 | void __user *buffer, | |
2824 | size_t *lenp, loff_t *ppos, | |
2825 | unsigned long convmul, | |
2826 | unsigned long convdiv) | |
2827 | { | |
2828 | return __do_proc_doulongvec_minmax(table->data, table, write, | |
2829 | buffer, lenp, ppos, convmul, convdiv); | |
2830 | } | |
2831 | ||
2832 | /** | |
2833 | * proc_doulongvec_minmax - read a vector of long integers with min/max values | |
2834 | * @table: the sysctl table | |
2835 | * @write: %TRUE if this is a write to the sysctl file | |
2836 | * @buffer: the user buffer | |
2837 | * @lenp: the size of the user buffer | |
2838 | * @ppos: file position | |
2839 | * | |
2840 | * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long | |
2841 | * values from/to the user buffer, treated as an ASCII string. | |
2842 | * | |
2843 | * This routine will ensure the values are within the range specified by | |
2844 | * table->extra1 (min) and table->extra2 (max). | |
2845 | * | |
2846 | * Returns 0 on success. | |
2847 | */ | |
2848 | int proc_doulongvec_minmax(struct ctl_table *table, int write, | |
2849 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2850 | { | |
2851 | return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l); | |
2852 | } | |
2853 | ||
2854 | /** | |
2855 | * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values | |
2856 | * @table: the sysctl table | |
2857 | * @write: %TRUE if this is a write to the sysctl file | |
2858 | * @buffer: the user buffer | |
2859 | * @lenp: the size of the user buffer | |
2860 | * @ppos: file position | |
2861 | * | |
2862 | * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long | |
2863 | * values from/to the user buffer, treated as an ASCII string. The values | |
2864 | * are treated as milliseconds, and converted to jiffies when they are stored. | |
2865 | * | |
2866 | * This routine will ensure the values are within the range specified by | |
2867 | * table->extra1 (min) and table->extra2 (max). | |
2868 | * | |
2869 | * Returns 0 on success. | |
2870 | */ | |
2871 | int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, | |
2872 | void __user *buffer, | |
2873 | size_t *lenp, loff_t *ppos) | |
2874 | { | |
2875 | return do_proc_doulongvec_minmax(table, write, buffer, | |
2876 | lenp, ppos, HZ, 1000l); | |
2877 | } | |
2878 | ||
2879 | ||
2880 | static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp, | |
2881 | int *valp, | |
2882 | int write, void *data) | |
2883 | { | |
2884 | if (write) { | |
2885 | if (*lvalp > INT_MAX / HZ) | |
2886 | return 1; | |
2887 | *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ); | |
2888 | } else { | |
2889 | int val = *valp; | |
2890 | unsigned long lval; | |
2891 | if (val < 0) { | |
2892 | *negp = true; | |
2893 | lval = -(unsigned long)val; | |
2894 | } else { | |
2895 | *negp = false; | |
2896 | lval = (unsigned long)val; | |
2897 | } | |
2898 | *lvalp = lval / HZ; | |
2899 | } | |
2900 | return 0; | |
2901 | } | |
2902 | ||
2903 | static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp, | |
2904 | int *valp, | |
2905 | int write, void *data) | |
2906 | { | |
2907 | if (write) { | |
2908 | if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ) | |
2909 | return 1; | |
2910 | *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp); | |
2911 | } else { | |
2912 | int val = *valp; | |
2913 | unsigned long lval; | |
2914 | if (val < 0) { | |
2915 | *negp = true; | |
2916 | lval = -(unsigned long)val; | |
2917 | } else { | |
2918 | *negp = false; | |
2919 | lval = (unsigned long)val; | |
2920 | } | |
2921 | *lvalp = jiffies_to_clock_t(lval); | |
2922 | } | |
2923 | return 0; | |
2924 | } | |
2925 | ||
2926 | static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp, | |
2927 | int *valp, | |
2928 | int write, void *data) | |
2929 | { | |
2930 | if (write) { | |
2931 | unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp); | |
2932 | ||
2933 | if (jif > INT_MAX) | |
2934 | return 1; | |
2935 | *valp = (int)jif; | |
2936 | } else { | |
2937 | int val = *valp; | |
2938 | unsigned long lval; | |
2939 | if (val < 0) { | |
2940 | *negp = true; | |
2941 | lval = -(unsigned long)val; | |
2942 | } else { | |
2943 | *negp = false; | |
2944 | lval = (unsigned long)val; | |
2945 | } | |
2946 | *lvalp = jiffies_to_msecs(lval); | |
2947 | } | |
2948 | return 0; | |
2949 | } | |
2950 | ||
2951 | /** | |
2952 | * proc_dointvec_jiffies - read a vector of integers as seconds | |
2953 | * @table: the sysctl table | |
2954 | * @write: %TRUE if this is a write to the sysctl file | |
2955 | * @buffer: the user buffer | |
2956 | * @lenp: the size of the user buffer | |
2957 | * @ppos: file position | |
2958 | * | |
2959 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer | |
2960 | * values from/to the user buffer, treated as an ASCII string. | |
2961 | * The values read are assumed to be in seconds, and are converted into | |
2962 | * jiffies. | |
2963 | * | |
2964 | * Returns 0 on success. | |
2965 | */ | |
2966 | int proc_dointvec_jiffies(struct ctl_table *table, int write, | |
2967 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2968 | { | |
2969 | return do_proc_dointvec(table,write,buffer,lenp,ppos, | |
2970 | do_proc_dointvec_jiffies_conv,NULL); | |
2971 | } | |
2972 | ||
2973 | /** | |
2974 | * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds | |
2975 | * @table: the sysctl table | |
2976 | * @write: %TRUE if this is a write to the sysctl file | |
2977 | * @buffer: the user buffer | |
2978 | * @lenp: the size of the user buffer | |
2979 | * @ppos: pointer to the file position | |
2980 | * | |
2981 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer | |
2982 | * values from/to the user buffer, treated as an ASCII string. | |
2983 | * The values read are assumed to be in 1/USER_HZ seconds, and | |
2984 | * are converted into jiffies. | |
2985 | * | |
2986 | * Returns 0 on success. | |
2987 | */ | |
2988 | int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, | |
2989 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2990 | { | |
2991 | return do_proc_dointvec(table,write,buffer,lenp,ppos, | |
2992 | do_proc_dointvec_userhz_jiffies_conv,NULL); | |
2993 | } | |
2994 | ||
2995 | /** | |
2996 | * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds | |
2997 | * @table: the sysctl table | |
2998 | * @write: %TRUE if this is a write to the sysctl file | |
2999 | * @buffer: the user buffer | |
3000 | * @lenp: the size of the user buffer | |
3001 | * @ppos: file position | |
3002 | * @ppos: the current position in the file | |
3003 | * | |
3004 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer | |
3005 | * values from/to the user buffer, treated as an ASCII string. | |
3006 | * The values read are assumed to be in 1/1000 seconds, and | |
3007 | * are converted into jiffies. | |
3008 | * | |
3009 | * Returns 0 on success. | |
3010 | */ | |
3011 | int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, | |
3012 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
3013 | { | |
3014 | return do_proc_dointvec(table, write, buffer, lenp, ppos, | |
3015 | do_proc_dointvec_ms_jiffies_conv, NULL); | |
3016 | } | |
3017 | ||
3018 | static int proc_do_cad_pid(struct ctl_table *table, int write, | |
3019 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
3020 | { | |
3021 | struct pid *new_pid; | |
3022 | pid_t tmp; | |
3023 | int r; | |
3024 | ||
3025 | tmp = pid_vnr(cad_pid); | |
3026 | ||
3027 | r = __do_proc_dointvec(&tmp, table, write, buffer, | |
3028 | lenp, ppos, NULL, NULL); | |
3029 | if (r || !write) | |
3030 | return r; | |
3031 | ||
3032 | new_pid = find_get_pid(tmp); | |
3033 | if (!new_pid) | |
3034 | return -ESRCH; | |
3035 | ||
3036 | put_pid(xchg(&cad_pid, new_pid)); | |
3037 | return 0; | |
3038 | } | |
3039 | ||
3040 | /** | |
3041 | * proc_do_large_bitmap - read/write from/to a large bitmap | |
3042 | * @table: the sysctl table | |
3043 | * @write: %TRUE if this is a write to the sysctl file | |
3044 | * @buffer: the user buffer | |
3045 | * @lenp: the size of the user buffer | |
3046 | * @ppos: file position | |
3047 | * | |
3048 | * The bitmap is stored at table->data and the bitmap length (in bits) | |
3049 | * in table->maxlen. | |
3050 | * | |
3051 | * We use a range comma separated format (e.g. 1,3-4,10-10) so that | |
3052 | * large bitmaps may be represented in a compact manner. Writing into | |
3053 | * the file will clear the bitmap then update it with the given input. | |
3054 | * | |
3055 | * Returns 0 on success. | |
3056 | */ | |
3057 | int proc_do_large_bitmap(struct ctl_table *table, int write, | |
3058 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
3059 | { | |
3060 | int err = 0; | |
3061 | bool first = 1; | |
3062 | size_t left = *lenp; | |
3063 | unsigned long bitmap_len = table->maxlen; | |
3064 | unsigned long *bitmap = *(unsigned long **) table->data; | |
3065 | unsigned long *tmp_bitmap = NULL; | |
3066 | char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c; | |
3067 | ||
3068 | if (!bitmap || !bitmap_len || !left || (*ppos && !write)) { | |
3069 | *lenp = 0; | |
3070 | return 0; | |
3071 | } | |
3072 | ||
3073 | if (write) { | |
3074 | char *kbuf, *p; | |
3075 | ||
3076 | if (left > PAGE_SIZE - 1) | |
3077 | left = PAGE_SIZE - 1; | |
3078 | ||
3079 | p = kbuf = memdup_user_nul(buffer, left); | |
3080 | if (IS_ERR(kbuf)) | |
3081 | return PTR_ERR(kbuf); | |
3082 | ||
3083 | tmp_bitmap = kcalloc(BITS_TO_LONGS(bitmap_len), | |
3084 | sizeof(unsigned long), | |
3085 | GFP_KERNEL); | |
3086 | if (!tmp_bitmap) { | |
3087 | kfree(kbuf); | |
3088 | return -ENOMEM; | |
3089 | } | |
3090 | proc_skip_char(&p, &left, '\n'); | |
3091 | while (!err && left) { | |
3092 | unsigned long val_a, val_b; | |
3093 | bool neg; | |
3094 | ||
3095 | err = proc_get_long(&p, &left, &val_a, &neg, tr_a, | |
3096 | sizeof(tr_a), &c); | |
3097 | if (err) | |
3098 | break; | |
3099 | if (val_a >= bitmap_len || neg) { | |
3100 | err = -EINVAL; | |
3101 | break; | |
3102 | } | |
3103 | ||
3104 | val_b = val_a; | |
3105 | if (left) { | |
3106 | p++; | |
3107 | left--; | |
3108 | } | |
3109 | ||
3110 | if (c == '-') { | |
3111 | err = proc_get_long(&p, &left, &val_b, | |
3112 | &neg, tr_b, sizeof(tr_b), | |
3113 | &c); | |
3114 | if (err) | |
3115 | break; | |
3116 | if (val_b >= bitmap_len || neg || | |
3117 | val_a > val_b) { | |
3118 | err = -EINVAL; | |
3119 | break; | |
3120 | } | |
3121 | if (left) { | |
3122 | p++; | |
3123 | left--; | |
3124 | } | |
3125 | } | |
3126 | ||
3127 | bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1); | |
3128 | first = 0; | |
3129 | proc_skip_char(&p, &left, '\n'); | |
3130 | } | |
3131 | kfree(kbuf); | |
3132 | } else { | |
3133 | unsigned long bit_a, bit_b = 0; | |
3134 | ||
3135 | while (left) { | |
3136 | bit_a = find_next_bit(bitmap, bitmap_len, bit_b); | |
3137 | if (bit_a >= bitmap_len) | |
3138 | break; | |
3139 | bit_b = find_next_zero_bit(bitmap, bitmap_len, | |
3140 | bit_a + 1) - 1; | |
3141 | ||
3142 | if (!first) { | |
3143 | err = proc_put_char(&buffer, &left, ','); | |
3144 | if (err) | |
3145 | break; | |
3146 | } | |
3147 | err = proc_put_long(&buffer, &left, bit_a, false); | |
3148 | if (err) | |
3149 | break; | |
3150 | if (bit_a != bit_b) { | |
3151 | err = proc_put_char(&buffer, &left, '-'); | |
3152 | if (err) | |
3153 | break; | |
3154 | err = proc_put_long(&buffer, &left, bit_b, false); | |
3155 | if (err) | |
3156 | break; | |
3157 | } | |
3158 | ||
3159 | first = 0; bit_b++; | |
3160 | } | |
3161 | if (!err) | |
3162 | err = proc_put_char(&buffer, &left, '\n'); | |
3163 | } | |
3164 | ||
3165 | if (!err) { | |
3166 | if (write) { | |
3167 | if (*ppos) | |
3168 | bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len); | |
3169 | else | |
3170 | bitmap_copy(bitmap, tmp_bitmap, bitmap_len); | |
3171 | } | |
3172 | *lenp -= left; | |
3173 | *ppos += *lenp; | |
3174 | } | |
3175 | ||
3176 | kfree(tmp_bitmap); | |
3177 | return err; | |
3178 | } | |
3179 | ||
3180 | #else /* CONFIG_PROC_SYSCTL */ | |
3181 | ||
3182 | int proc_dostring(struct ctl_table *table, int write, | |
3183 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
3184 | { | |
3185 | return -ENOSYS; | |
3186 | } | |
3187 | ||
3188 | int proc_dointvec(struct ctl_table *table, int write, | |
3189 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
3190 | { | |
3191 | return -ENOSYS; | |
3192 | } | |
3193 | ||
3194 | int proc_douintvec(struct ctl_table *table, int write, | |
3195 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
3196 | { | |
3197 | return -ENOSYS; | |
3198 | } | |
3199 | ||
3200 | int proc_dointvec_minmax(struct ctl_table *table, int write, | |
3201 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
3202 | { | |
3203 | return -ENOSYS; | |
3204 | } | |
3205 | ||
3206 | int proc_douintvec_minmax(struct ctl_table *table, int write, | |
3207 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
3208 | { | |
3209 | return -ENOSYS; | |
3210 | } | |
3211 | ||
3212 | int proc_dointvec_jiffies(struct ctl_table *table, int write, | |
3213 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
3214 | { | |
3215 | return -ENOSYS; | |
3216 | } | |
3217 | ||
3218 | int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, | |
3219 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
3220 | { | |
3221 | return -ENOSYS; | |
3222 | } | |
3223 | ||
3224 | int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, | |
3225 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
3226 | { | |
3227 | return -ENOSYS; | |
3228 | } | |
3229 | ||
3230 | int proc_doulongvec_minmax(struct ctl_table *table, int write, | |
3231 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
3232 | { | |
3233 | return -ENOSYS; | |
3234 | } | |
3235 | ||
3236 | int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, | |
3237 | void __user *buffer, | |
3238 | size_t *lenp, loff_t *ppos) | |
3239 | { | |
3240 | return -ENOSYS; | |
3241 | } | |
3242 | ||
3243 | ||
3244 | #endif /* CONFIG_PROC_SYSCTL */ | |
3245 | ||
3246 | /* | |
3247 | * No sense putting this after each symbol definition, twice, | |
3248 | * exception granted :-) | |
3249 | */ | |
3250 | EXPORT_SYMBOL(proc_dointvec); | |
3251 | EXPORT_SYMBOL(proc_douintvec); | |
3252 | EXPORT_SYMBOL(proc_dointvec_jiffies); | |
3253 | EXPORT_SYMBOL(proc_dointvec_minmax); | |
3254 | EXPORT_SYMBOL_GPL(proc_douintvec_minmax); | |
3255 | EXPORT_SYMBOL(proc_dointvec_userhz_jiffies); | |
3256 | EXPORT_SYMBOL(proc_dointvec_ms_jiffies); | |
3257 | EXPORT_SYMBOL(proc_dostring); | |
3258 | EXPORT_SYMBOL(proc_doulongvec_minmax); | |
3259 | EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax); |