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1 | /* | |
2 | * sysctl.c: General linux system control interface | |
3 | * | |
4 | * Begun 24 March 1995, Stephen Tweedie | |
5 | * Added /proc support, Dec 1995 | |
6 | * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas. | |
7 | * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver. | |
8 | * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver. | |
9 | * Dynamic registration fixes, Stephen Tweedie. | |
10 | * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn. | |
11 | * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris | |
12 | * Horn. | |
13 | * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer. | |
14 | * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer. | |
15 | * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill | |
16 | * Wendling. | |
17 | * The list_for_each() macro wasn't appropriate for the sysctl loop. | |
18 | * Removed it and replaced it with older style, 03/23/00, Bill Wendling | |
19 | */ | |
20 | ||
21 | #include <linux/module.h> | |
22 | #include <linux/mm.h> | |
23 | #include <linux/swap.h> | |
24 | #include <linux/slab.h> | |
25 | #include <linux/sysctl.h> | |
26 | #include <linux/proc_fs.h> | |
27 | #include <linux/security.h> | |
28 | #include <linux/ctype.h> | |
29 | #include <linux/utsname.h> | |
30 | #include <linux/smp_lock.h> | |
31 | #include <linux/fs.h> | |
32 | #include <linux/init.h> | |
33 | #include <linux/kernel.h> | |
34 | #include <linux/kobject.h> | |
35 | #include <linux/net.h> | |
36 | #include <linux/sysrq.h> | |
37 | #include <linux/highuid.h> | |
38 | #include <linux/writeback.h> | |
39 | #include <linux/hugetlb.h> | |
40 | #include <linux/initrd.h> | |
41 | #include <linux/key.h> | |
42 | #include <linux/times.h> | |
43 | #include <linux/limits.h> | |
44 | #include <linux/dcache.h> | |
45 | #include <linux/syscalls.h> | |
46 | #include <linux/vmstat.h> | |
47 | #include <linux/nfs_fs.h> | |
48 | #include <linux/acpi.h> | |
49 | #include <linux/reboot.h> | |
50 | #include <linux/ftrace.h> | |
51 | ||
52 | #include <asm/uaccess.h> | |
53 | #include <asm/processor.h> | |
54 | ||
55 | #ifdef CONFIG_X86 | |
56 | #include <asm/nmi.h> | |
57 | #include <asm/stacktrace.h> | |
58 | #include <asm/io.h> | |
59 | #endif | |
60 | ||
61 | static int deprecated_sysctl_warning(struct __sysctl_args *args); | |
62 | ||
63 | #if defined(CONFIG_SYSCTL) | |
64 | ||
65 | /* External variables not in a header file. */ | |
66 | extern int C_A_D; | |
67 | extern int print_fatal_signals; | |
68 | extern int sysctl_overcommit_memory; | |
69 | extern int sysctl_overcommit_ratio; | |
70 | extern int sysctl_panic_on_oom; | |
71 | extern int sysctl_oom_kill_allocating_task; | |
72 | extern int sysctl_oom_dump_tasks; | |
73 | extern int max_threads; | |
74 | extern int core_uses_pid; | |
75 | extern int suid_dumpable; | |
76 | extern char core_pattern[]; | |
77 | extern int pid_max; | |
78 | extern int min_free_kbytes; | |
79 | extern int pid_max_min, pid_max_max; | |
80 | extern int sysctl_drop_caches; | |
81 | extern int percpu_pagelist_fraction; | |
82 | extern int compat_log; | |
83 | extern int latencytop_enabled; | |
84 | extern int sysctl_nr_open_min, sysctl_nr_open_max; | |
85 | #ifdef CONFIG_RCU_TORTURE_TEST | |
86 | extern int rcutorture_runnable; | |
87 | #endif /* #ifdef CONFIG_RCU_TORTURE_TEST */ | |
88 | ||
89 | /* Constants used for minimum and maximum */ | |
90 | #if defined(CONFIG_HIGHMEM) || defined(CONFIG_DETECT_SOFTLOCKUP) | |
91 | static int one = 1; | |
92 | #endif | |
93 | ||
94 | #ifdef CONFIG_DETECT_SOFTLOCKUP | |
95 | static int sixty = 60; | |
96 | static int neg_one = -1; | |
97 | #endif | |
98 | ||
99 | #if defined(CONFIG_MMU) && defined(CONFIG_FILE_LOCKING) | |
100 | static int two = 2; | |
101 | #endif | |
102 | ||
103 | static int zero; | |
104 | static int one_hundred = 100; | |
105 | ||
106 | /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */ | |
107 | static int maxolduid = 65535; | |
108 | static int minolduid; | |
109 | static int min_percpu_pagelist_fract = 8; | |
110 | ||
111 | static int ngroups_max = NGROUPS_MAX; | |
112 | ||
113 | #ifdef CONFIG_MODULES | |
114 | extern char modprobe_path[]; | |
115 | #endif | |
116 | #ifdef CONFIG_CHR_DEV_SG | |
117 | extern int sg_big_buff; | |
118 | #endif | |
119 | ||
120 | #ifdef CONFIG_SPARC | |
121 | #include <asm/system.h> | |
122 | #endif | |
123 | ||
124 | #ifdef __hppa__ | |
125 | extern int pwrsw_enabled; | |
126 | extern int unaligned_enabled; | |
127 | #endif | |
128 | ||
129 | #ifdef CONFIG_S390 | |
130 | #ifdef CONFIG_MATHEMU | |
131 | extern int sysctl_ieee_emulation_warnings; | |
132 | #endif | |
133 | extern int sysctl_userprocess_debug; | |
134 | extern int spin_retry; | |
135 | #endif | |
136 | ||
137 | #ifdef CONFIG_BSD_PROCESS_ACCT | |
138 | extern int acct_parm[]; | |
139 | #endif | |
140 | ||
141 | #ifdef CONFIG_IA64 | |
142 | extern int no_unaligned_warning; | |
143 | #endif | |
144 | ||
145 | #ifdef CONFIG_RT_MUTEXES | |
146 | extern int max_lock_depth; | |
147 | #endif | |
148 | ||
149 | #ifdef CONFIG_PROC_SYSCTL | |
150 | static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp, | |
151 | void __user *buffer, size_t *lenp, loff_t *ppos); | |
152 | static int proc_taint(struct ctl_table *table, int write, struct file *filp, | |
153 | void __user *buffer, size_t *lenp, loff_t *ppos); | |
154 | #endif | |
155 | ||
156 | static struct ctl_table root_table[]; | |
157 | static struct ctl_table_root sysctl_table_root; | |
158 | static struct ctl_table_header root_table_header = { | |
159 | .count = 1, | |
160 | .ctl_table = root_table, | |
161 | .ctl_entry = LIST_HEAD_INIT(sysctl_table_root.default_set.list), | |
162 | .root = &sysctl_table_root, | |
163 | .set = &sysctl_table_root.default_set, | |
164 | }; | |
165 | static struct ctl_table_root sysctl_table_root = { | |
166 | .root_list = LIST_HEAD_INIT(sysctl_table_root.root_list), | |
167 | .default_set.list = LIST_HEAD_INIT(root_table_header.ctl_entry), | |
168 | }; | |
169 | ||
170 | static struct ctl_table kern_table[]; | |
171 | static struct ctl_table vm_table[]; | |
172 | static struct ctl_table fs_table[]; | |
173 | static struct ctl_table debug_table[]; | |
174 | static struct ctl_table dev_table[]; | |
175 | extern struct ctl_table random_table[]; | |
176 | #ifdef CONFIG_INOTIFY_USER | |
177 | extern struct ctl_table inotify_table[]; | |
178 | #endif | |
179 | ||
180 | #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT | |
181 | int sysctl_legacy_va_layout; | |
182 | #endif | |
183 | ||
184 | extern int prove_locking; | |
185 | extern int lock_stat; | |
186 | ||
187 | /* The default sysctl tables: */ | |
188 | ||
189 | static struct ctl_table root_table[] = { | |
190 | { | |
191 | .ctl_name = CTL_KERN, | |
192 | .procname = "kernel", | |
193 | .mode = 0555, | |
194 | .child = kern_table, | |
195 | }, | |
196 | { | |
197 | .ctl_name = CTL_VM, | |
198 | .procname = "vm", | |
199 | .mode = 0555, | |
200 | .child = vm_table, | |
201 | }, | |
202 | { | |
203 | .ctl_name = CTL_FS, | |
204 | .procname = "fs", | |
205 | .mode = 0555, | |
206 | .child = fs_table, | |
207 | }, | |
208 | { | |
209 | .ctl_name = CTL_DEBUG, | |
210 | .procname = "debug", | |
211 | .mode = 0555, | |
212 | .child = debug_table, | |
213 | }, | |
214 | { | |
215 | .ctl_name = CTL_DEV, | |
216 | .procname = "dev", | |
217 | .mode = 0555, | |
218 | .child = dev_table, | |
219 | }, | |
220 | /* | |
221 | * NOTE: do not add new entries to this table unless you have read | |
222 | * Documentation/sysctl/ctl_unnumbered.txt | |
223 | */ | |
224 | { .ctl_name = 0 } | |
225 | }; | |
226 | ||
227 | #ifdef CONFIG_SCHED_DEBUG | |
228 | static int min_sched_granularity_ns = 100000; /* 100 usecs */ | |
229 | static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */ | |
230 | static int min_wakeup_granularity_ns; /* 0 usecs */ | |
231 | static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */ | |
232 | #endif | |
233 | ||
234 | static struct ctl_table kern_table[] = { | |
235 | #ifdef CONFIG_SCHED_DEBUG | |
236 | { | |
237 | .ctl_name = CTL_UNNUMBERED, | |
238 | .procname = "sched_min_granularity_ns", | |
239 | .data = &sysctl_sched_min_granularity, | |
240 | .maxlen = sizeof(unsigned int), | |
241 | .mode = 0644, | |
242 | .proc_handler = &sched_nr_latency_handler, | |
243 | .strategy = &sysctl_intvec, | |
244 | .extra1 = &min_sched_granularity_ns, | |
245 | .extra2 = &max_sched_granularity_ns, | |
246 | }, | |
247 | { | |
248 | .ctl_name = CTL_UNNUMBERED, | |
249 | .procname = "sched_latency_ns", | |
250 | .data = &sysctl_sched_latency, | |
251 | .maxlen = sizeof(unsigned int), | |
252 | .mode = 0644, | |
253 | .proc_handler = &sched_nr_latency_handler, | |
254 | .strategy = &sysctl_intvec, | |
255 | .extra1 = &min_sched_granularity_ns, | |
256 | .extra2 = &max_sched_granularity_ns, | |
257 | }, | |
258 | { | |
259 | .ctl_name = CTL_UNNUMBERED, | |
260 | .procname = "sched_wakeup_granularity_ns", | |
261 | .data = &sysctl_sched_wakeup_granularity, | |
262 | .maxlen = sizeof(unsigned int), | |
263 | .mode = 0644, | |
264 | .proc_handler = &proc_dointvec_minmax, | |
265 | .strategy = &sysctl_intvec, | |
266 | .extra1 = &min_wakeup_granularity_ns, | |
267 | .extra2 = &max_wakeup_granularity_ns, | |
268 | }, | |
269 | { | |
270 | .ctl_name = CTL_UNNUMBERED, | |
271 | .procname = "sched_shares_ratelimit", | |
272 | .data = &sysctl_sched_shares_ratelimit, | |
273 | .maxlen = sizeof(unsigned int), | |
274 | .mode = 0644, | |
275 | .proc_handler = &proc_dointvec, | |
276 | }, | |
277 | { | |
278 | .ctl_name = CTL_UNNUMBERED, | |
279 | .procname = "sched_child_runs_first", | |
280 | .data = &sysctl_sched_child_runs_first, | |
281 | .maxlen = sizeof(unsigned int), | |
282 | .mode = 0644, | |
283 | .proc_handler = &proc_dointvec, | |
284 | }, | |
285 | { | |
286 | .ctl_name = CTL_UNNUMBERED, | |
287 | .procname = "sched_features", | |
288 | .data = &sysctl_sched_features, | |
289 | .maxlen = sizeof(unsigned int), | |
290 | .mode = 0644, | |
291 | .proc_handler = &proc_dointvec, | |
292 | }, | |
293 | { | |
294 | .ctl_name = CTL_UNNUMBERED, | |
295 | .procname = "sched_migration_cost", | |
296 | .data = &sysctl_sched_migration_cost, | |
297 | .maxlen = sizeof(unsigned int), | |
298 | .mode = 0644, | |
299 | .proc_handler = &proc_dointvec, | |
300 | }, | |
301 | { | |
302 | .ctl_name = CTL_UNNUMBERED, | |
303 | .procname = "sched_nr_migrate", | |
304 | .data = &sysctl_sched_nr_migrate, | |
305 | .maxlen = sizeof(unsigned int), | |
306 | .mode = 0644, | |
307 | .proc_handler = &proc_dointvec, | |
308 | }, | |
309 | #endif | |
310 | { | |
311 | .ctl_name = CTL_UNNUMBERED, | |
312 | .procname = "sched_rt_period_us", | |
313 | .data = &sysctl_sched_rt_period, | |
314 | .maxlen = sizeof(unsigned int), | |
315 | .mode = 0644, | |
316 | .proc_handler = &sched_rt_handler, | |
317 | }, | |
318 | { | |
319 | .ctl_name = CTL_UNNUMBERED, | |
320 | .procname = "sched_rt_runtime_us", | |
321 | .data = &sysctl_sched_rt_runtime, | |
322 | .maxlen = sizeof(int), | |
323 | .mode = 0644, | |
324 | .proc_handler = &sched_rt_handler, | |
325 | }, | |
326 | { | |
327 | .ctl_name = CTL_UNNUMBERED, | |
328 | .procname = "sched_compat_yield", | |
329 | .data = &sysctl_sched_compat_yield, | |
330 | .maxlen = sizeof(unsigned int), | |
331 | .mode = 0644, | |
332 | .proc_handler = &proc_dointvec, | |
333 | }, | |
334 | #ifdef CONFIG_PROVE_LOCKING | |
335 | { | |
336 | .ctl_name = CTL_UNNUMBERED, | |
337 | .procname = "prove_locking", | |
338 | .data = &prove_locking, | |
339 | .maxlen = sizeof(int), | |
340 | .mode = 0644, | |
341 | .proc_handler = &proc_dointvec, | |
342 | }, | |
343 | #endif | |
344 | #ifdef CONFIG_LOCK_STAT | |
345 | { | |
346 | .ctl_name = CTL_UNNUMBERED, | |
347 | .procname = "lock_stat", | |
348 | .data = &lock_stat, | |
349 | .maxlen = sizeof(int), | |
350 | .mode = 0644, | |
351 | .proc_handler = &proc_dointvec, | |
352 | }, | |
353 | #endif | |
354 | { | |
355 | .ctl_name = KERN_PANIC, | |
356 | .procname = "panic", | |
357 | .data = &panic_timeout, | |
358 | .maxlen = sizeof(int), | |
359 | .mode = 0644, | |
360 | .proc_handler = &proc_dointvec, | |
361 | }, | |
362 | { | |
363 | .ctl_name = KERN_CORE_USES_PID, | |
364 | .procname = "core_uses_pid", | |
365 | .data = &core_uses_pid, | |
366 | .maxlen = sizeof(int), | |
367 | .mode = 0644, | |
368 | .proc_handler = &proc_dointvec, | |
369 | }, | |
370 | { | |
371 | .ctl_name = KERN_CORE_PATTERN, | |
372 | .procname = "core_pattern", | |
373 | .data = core_pattern, | |
374 | .maxlen = CORENAME_MAX_SIZE, | |
375 | .mode = 0644, | |
376 | .proc_handler = &proc_dostring, | |
377 | .strategy = &sysctl_string, | |
378 | }, | |
379 | #ifdef CONFIG_PROC_SYSCTL | |
380 | { | |
381 | .procname = "tainted", | |
382 | .maxlen = sizeof(long), | |
383 | .mode = 0644, | |
384 | .proc_handler = &proc_taint, | |
385 | }, | |
386 | #endif | |
387 | #ifdef CONFIG_LATENCYTOP | |
388 | { | |
389 | .procname = "latencytop", | |
390 | .data = &latencytop_enabled, | |
391 | .maxlen = sizeof(int), | |
392 | .mode = 0644, | |
393 | .proc_handler = &proc_dointvec, | |
394 | }, | |
395 | #endif | |
396 | #ifdef CONFIG_BLK_DEV_INITRD | |
397 | { | |
398 | .ctl_name = KERN_REALROOTDEV, | |
399 | .procname = "real-root-dev", | |
400 | .data = &real_root_dev, | |
401 | .maxlen = sizeof(int), | |
402 | .mode = 0644, | |
403 | .proc_handler = &proc_dointvec, | |
404 | }, | |
405 | #endif | |
406 | { | |
407 | .ctl_name = CTL_UNNUMBERED, | |
408 | .procname = "print-fatal-signals", | |
409 | .data = &print_fatal_signals, | |
410 | .maxlen = sizeof(int), | |
411 | .mode = 0644, | |
412 | .proc_handler = &proc_dointvec, | |
413 | }, | |
414 | #ifdef CONFIG_SPARC | |
415 | { | |
416 | .ctl_name = KERN_SPARC_REBOOT, | |
417 | .procname = "reboot-cmd", | |
418 | .data = reboot_command, | |
419 | .maxlen = 256, | |
420 | .mode = 0644, | |
421 | .proc_handler = &proc_dostring, | |
422 | .strategy = &sysctl_string, | |
423 | }, | |
424 | { | |
425 | .ctl_name = KERN_SPARC_STOP_A, | |
426 | .procname = "stop-a", | |
427 | .data = &stop_a_enabled, | |
428 | .maxlen = sizeof (int), | |
429 | .mode = 0644, | |
430 | .proc_handler = &proc_dointvec, | |
431 | }, | |
432 | { | |
433 | .ctl_name = KERN_SPARC_SCONS_PWROFF, | |
434 | .procname = "scons-poweroff", | |
435 | .data = &scons_pwroff, | |
436 | .maxlen = sizeof (int), | |
437 | .mode = 0644, | |
438 | .proc_handler = &proc_dointvec, | |
439 | }, | |
440 | #endif | |
441 | #ifdef __hppa__ | |
442 | { | |
443 | .ctl_name = KERN_HPPA_PWRSW, | |
444 | .procname = "soft-power", | |
445 | .data = &pwrsw_enabled, | |
446 | .maxlen = sizeof (int), | |
447 | .mode = 0644, | |
448 | .proc_handler = &proc_dointvec, | |
449 | }, | |
450 | { | |
451 | .ctl_name = KERN_HPPA_UNALIGNED, | |
452 | .procname = "unaligned-trap", | |
453 | .data = &unaligned_enabled, | |
454 | .maxlen = sizeof (int), | |
455 | .mode = 0644, | |
456 | .proc_handler = &proc_dointvec, | |
457 | }, | |
458 | #endif | |
459 | { | |
460 | .ctl_name = KERN_CTLALTDEL, | |
461 | .procname = "ctrl-alt-del", | |
462 | .data = &C_A_D, | |
463 | .maxlen = sizeof(int), | |
464 | .mode = 0644, | |
465 | .proc_handler = &proc_dointvec, | |
466 | }, | |
467 | #ifdef CONFIG_FTRACE | |
468 | { | |
469 | .ctl_name = CTL_UNNUMBERED, | |
470 | .procname = "ftrace_enabled", | |
471 | .data = &ftrace_enabled, | |
472 | .maxlen = sizeof(int), | |
473 | .mode = 0644, | |
474 | .proc_handler = &ftrace_enable_sysctl, | |
475 | }, | |
476 | #endif | |
477 | #ifdef CONFIG_MODULES | |
478 | { | |
479 | .ctl_name = KERN_MODPROBE, | |
480 | .procname = "modprobe", | |
481 | .data = &modprobe_path, | |
482 | .maxlen = KMOD_PATH_LEN, | |
483 | .mode = 0644, | |
484 | .proc_handler = &proc_dostring, | |
485 | .strategy = &sysctl_string, | |
486 | }, | |
487 | #endif | |
488 | #if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET) | |
489 | { | |
490 | .ctl_name = KERN_HOTPLUG, | |
491 | .procname = "hotplug", | |
492 | .data = &uevent_helper, | |
493 | .maxlen = UEVENT_HELPER_PATH_LEN, | |
494 | .mode = 0644, | |
495 | .proc_handler = &proc_dostring, | |
496 | .strategy = &sysctl_string, | |
497 | }, | |
498 | #endif | |
499 | #ifdef CONFIG_CHR_DEV_SG | |
500 | { | |
501 | .ctl_name = KERN_SG_BIG_BUFF, | |
502 | .procname = "sg-big-buff", | |
503 | .data = &sg_big_buff, | |
504 | .maxlen = sizeof (int), | |
505 | .mode = 0444, | |
506 | .proc_handler = &proc_dointvec, | |
507 | }, | |
508 | #endif | |
509 | #ifdef CONFIG_BSD_PROCESS_ACCT | |
510 | { | |
511 | .ctl_name = KERN_ACCT, | |
512 | .procname = "acct", | |
513 | .data = &acct_parm, | |
514 | .maxlen = 3*sizeof(int), | |
515 | .mode = 0644, | |
516 | .proc_handler = &proc_dointvec, | |
517 | }, | |
518 | #endif | |
519 | #ifdef CONFIG_MAGIC_SYSRQ | |
520 | { | |
521 | .ctl_name = KERN_SYSRQ, | |
522 | .procname = "sysrq", | |
523 | .data = &__sysrq_enabled, | |
524 | .maxlen = sizeof (int), | |
525 | .mode = 0644, | |
526 | .proc_handler = &proc_dointvec, | |
527 | }, | |
528 | #endif | |
529 | #ifdef CONFIG_PROC_SYSCTL | |
530 | { | |
531 | .procname = "cad_pid", | |
532 | .data = NULL, | |
533 | .maxlen = sizeof (int), | |
534 | .mode = 0600, | |
535 | .proc_handler = &proc_do_cad_pid, | |
536 | }, | |
537 | #endif | |
538 | { | |
539 | .ctl_name = KERN_MAX_THREADS, | |
540 | .procname = "threads-max", | |
541 | .data = &max_threads, | |
542 | .maxlen = sizeof(int), | |
543 | .mode = 0644, | |
544 | .proc_handler = &proc_dointvec, | |
545 | }, | |
546 | { | |
547 | .ctl_name = KERN_RANDOM, | |
548 | .procname = "random", | |
549 | .mode = 0555, | |
550 | .child = random_table, | |
551 | }, | |
552 | { | |
553 | .ctl_name = KERN_OVERFLOWUID, | |
554 | .procname = "overflowuid", | |
555 | .data = &overflowuid, | |
556 | .maxlen = sizeof(int), | |
557 | .mode = 0644, | |
558 | .proc_handler = &proc_dointvec_minmax, | |
559 | .strategy = &sysctl_intvec, | |
560 | .extra1 = &minolduid, | |
561 | .extra2 = &maxolduid, | |
562 | }, | |
563 | { | |
564 | .ctl_name = KERN_OVERFLOWGID, | |
565 | .procname = "overflowgid", | |
566 | .data = &overflowgid, | |
567 | .maxlen = sizeof(int), | |
568 | .mode = 0644, | |
569 | .proc_handler = &proc_dointvec_minmax, | |
570 | .strategy = &sysctl_intvec, | |
571 | .extra1 = &minolduid, | |
572 | .extra2 = &maxolduid, | |
573 | }, | |
574 | #ifdef CONFIG_S390 | |
575 | #ifdef CONFIG_MATHEMU | |
576 | { | |
577 | .ctl_name = KERN_IEEE_EMULATION_WARNINGS, | |
578 | .procname = "ieee_emulation_warnings", | |
579 | .data = &sysctl_ieee_emulation_warnings, | |
580 | .maxlen = sizeof(int), | |
581 | .mode = 0644, | |
582 | .proc_handler = &proc_dointvec, | |
583 | }, | |
584 | #endif | |
585 | { | |
586 | .ctl_name = KERN_S390_USER_DEBUG_LOGGING, | |
587 | .procname = "userprocess_debug", | |
588 | .data = &sysctl_userprocess_debug, | |
589 | .maxlen = sizeof(int), | |
590 | .mode = 0644, | |
591 | .proc_handler = &proc_dointvec, | |
592 | }, | |
593 | #endif | |
594 | { | |
595 | .ctl_name = KERN_PIDMAX, | |
596 | .procname = "pid_max", | |
597 | .data = &pid_max, | |
598 | .maxlen = sizeof (int), | |
599 | .mode = 0644, | |
600 | .proc_handler = &proc_dointvec_minmax, | |
601 | .strategy = sysctl_intvec, | |
602 | .extra1 = &pid_max_min, | |
603 | .extra2 = &pid_max_max, | |
604 | }, | |
605 | { | |
606 | .ctl_name = KERN_PANIC_ON_OOPS, | |
607 | .procname = "panic_on_oops", | |
608 | .data = &panic_on_oops, | |
609 | .maxlen = sizeof(int), | |
610 | .mode = 0644, | |
611 | .proc_handler = &proc_dointvec, | |
612 | }, | |
613 | #if defined CONFIG_PRINTK | |
614 | { | |
615 | .ctl_name = KERN_PRINTK, | |
616 | .procname = "printk", | |
617 | .data = &console_loglevel, | |
618 | .maxlen = 4*sizeof(int), | |
619 | .mode = 0644, | |
620 | .proc_handler = &proc_dointvec, | |
621 | }, | |
622 | { | |
623 | .ctl_name = KERN_PRINTK_RATELIMIT, | |
624 | .procname = "printk_ratelimit", | |
625 | .data = &printk_ratelimit_state.interval, | |
626 | .maxlen = sizeof(int), | |
627 | .mode = 0644, | |
628 | .proc_handler = &proc_dointvec_jiffies, | |
629 | .strategy = &sysctl_jiffies, | |
630 | }, | |
631 | { | |
632 | .ctl_name = KERN_PRINTK_RATELIMIT_BURST, | |
633 | .procname = "printk_ratelimit_burst", | |
634 | .data = &printk_ratelimit_state.burst, | |
635 | .maxlen = sizeof(int), | |
636 | .mode = 0644, | |
637 | .proc_handler = &proc_dointvec, | |
638 | }, | |
639 | #endif | |
640 | { | |
641 | .ctl_name = KERN_NGROUPS_MAX, | |
642 | .procname = "ngroups_max", | |
643 | .data = &ngroups_max, | |
644 | .maxlen = sizeof (int), | |
645 | .mode = 0444, | |
646 | .proc_handler = &proc_dointvec, | |
647 | }, | |
648 | #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86) | |
649 | { | |
650 | .ctl_name = KERN_UNKNOWN_NMI_PANIC, | |
651 | .procname = "unknown_nmi_panic", | |
652 | .data = &unknown_nmi_panic, | |
653 | .maxlen = sizeof (int), | |
654 | .mode = 0644, | |
655 | .proc_handler = &proc_dointvec, | |
656 | }, | |
657 | { | |
658 | .procname = "nmi_watchdog", | |
659 | .data = &nmi_watchdog_enabled, | |
660 | .maxlen = sizeof (int), | |
661 | .mode = 0644, | |
662 | .proc_handler = &proc_nmi_enabled, | |
663 | }, | |
664 | #endif | |
665 | #if defined(CONFIG_X86) | |
666 | { | |
667 | .ctl_name = KERN_PANIC_ON_NMI, | |
668 | .procname = "panic_on_unrecovered_nmi", | |
669 | .data = &panic_on_unrecovered_nmi, | |
670 | .maxlen = sizeof(int), | |
671 | .mode = 0644, | |
672 | .proc_handler = &proc_dointvec, | |
673 | }, | |
674 | { | |
675 | .ctl_name = KERN_BOOTLOADER_TYPE, | |
676 | .procname = "bootloader_type", | |
677 | .data = &bootloader_type, | |
678 | .maxlen = sizeof (int), | |
679 | .mode = 0444, | |
680 | .proc_handler = &proc_dointvec, | |
681 | }, | |
682 | { | |
683 | .ctl_name = CTL_UNNUMBERED, | |
684 | .procname = "kstack_depth_to_print", | |
685 | .data = &kstack_depth_to_print, | |
686 | .maxlen = sizeof(int), | |
687 | .mode = 0644, | |
688 | .proc_handler = &proc_dointvec, | |
689 | }, | |
690 | { | |
691 | .ctl_name = CTL_UNNUMBERED, | |
692 | .procname = "io_delay_type", | |
693 | .data = &io_delay_type, | |
694 | .maxlen = sizeof(int), | |
695 | .mode = 0644, | |
696 | .proc_handler = &proc_dointvec, | |
697 | }, | |
698 | #endif | |
699 | #if defined(CONFIG_MMU) | |
700 | { | |
701 | .ctl_name = KERN_RANDOMIZE, | |
702 | .procname = "randomize_va_space", | |
703 | .data = &randomize_va_space, | |
704 | .maxlen = sizeof(int), | |
705 | .mode = 0644, | |
706 | .proc_handler = &proc_dointvec, | |
707 | }, | |
708 | #endif | |
709 | #if defined(CONFIG_S390) && defined(CONFIG_SMP) | |
710 | { | |
711 | .ctl_name = KERN_SPIN_RETRY, | |
712 | .procname = "spin_retry", | |
713 | .data = &spin_retry, | |
714 | .maxlen = sizeof (int), | |
715 | .mode = 0644, | |
716 | .proc_handler = &proc_dointvec, | |
717 | }, | |
718 | #endif | |
719 | #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86) | |
720 | { | |
721 | .procname = "acpi_video_flags", | |
722 | .data = &acpi_realmode_flags, | |
723 | .maxlen = sizeof (unsigned long), | |
724 | .mode = 0644, | |
725 | .proc_handler = &proc_doulongvec_minmax, | |
726 | }, | |
727 | #endif | |
728 | #ifdef CONFIG_IA64 | |
729 | { | |
730 | .ctl_name = KERN_IA64_UNALIGNED, | |
731 | .procname = "ignore-unaligned-usertrap", | |
732 | .data = &no_unaligned_warning, | |
733 | .maxlen = sizeof (int), | |
734 | .mode = 0644, | |
735 | .proc_handler = &proc_dointvec, | |
736 | }, | |
737 | #endif | |
738 | #ifdef CONFIG_DETECT_SOFTLOCKUP | |
739 | { | |
740 | .ctl_name = CTL_UNNUMBERED, | |
741 | .procname = "softlockup_panic", | |
742 | .data = &softlockup_panic, | |
743 | .maxlen = sizeof(int), | |
744 | .mode = 0644, | |
745 | .proc_handler = &proc_dointvec_minmax, | |
746 | .strategy = &sysctl_intvec, | |
747 | .extra1 = &zero, | |
748 | .extra2 = &one, | |
749 | }, | |
750 | { | |
751 | .ctl_name = CTL_UNNUMBERED, | |
752 | .procname = "softlockup_thresh", | |
753 | .data = &softlockup_thresh, | |
754 | .maxlen = sizeof(int), | |
755 | .mode = 0644, | |
756 | .proc_handler = &proc_dointvec_minmax, | |
757 | .strategy = &sysctl_intvec, | |
758 | .extra1 = &neg_one, | |
759 | .extra2 = &sixty, | |
760 | }, | |
761 | { | |
762 | .ctl_name = CTL_UNNUMBERED, | |
763 | .procname = "hung_task_check_count", | |
764 | .data = &sysctl_hung_task_check_count, | |
765 | .maxlen = sizeof(unsigned long), | |
766 | .mode = 0644, | |
767 | .proc_handler = &proc_doulongvec_minmax, | |
768 | .strategy = &sysctl_intvec, | |
769 | }, | |
770 | { | |
771 | .ctl_name = CTL_UNNUMBERED, | |
772 | .procname = "hung_task_timeout_secs", | |
773 | .data = &sysctl_hung_task_timeout_secs, | |
774 | .maxlen = sizeof(unsigned long), | |
775 | .mode = 0644, | |
776 | .proc_handler = &proc_doulongvec_minmax, | |
777 | .strategy = &sysctl_intvec, | |
778 | }, | |
779 | { | |
780 | .ctl_name = CTL_UNNUMBERED, | |
781 | .procname = "hung_task_warnings", | |
782 | .data = &sysctl_hung_task_warnings, | |
783 | .maxlen = sizeof(unsigned long), | |
784 | .mode = 0644, | |
785 | .proc_handler = &proc_doulongvec_minmax, | |
786 | .strategy = &sysctl_intvec, | |
787 | }, | |
788 | #endif | |
789 | #ifdef CONFIG_COMPAT | |
790 | { | |
791 | .ctl_name = KERN_COMPAT_LOG, | |
792 | .procname = "compat-log", | |
793 | .data = &compat_log, | |
794 | .maxlen = sizeof (int), | |
795 | .mode = 0644, | |
796 | .proc_handler = &proc_dointvec, | |
797 | }, | |
798 | #endif | |
799 | #ifdef CONFIG_RT_MUTEXES | |
800 | { | |
801 | .ctl_name = KERN_MAX_LOCK_DEPTH, | |
802 | .procname = "max_lock_depth", | |
803 | .data = &max_lock_depth, | |
804 | .maxlen = sizeof(int), | |
805 | .mode = 0644, | |
806 | .proc_handler = &proc_dointvec, | |
807 | }, | |
808 | #endif | |
809 | { | |
810 | .ctl_name = CTL_UNNUMBERED, | |
811 | .procname = "poweroff_cmd", | |
812 | .data = &poweroff_cmd, | |
813 | .maxlen = POWEROFF_CMD_PATH_LEN, | |
814 | .mode = 0644, | |
815 | .proc_handler = &proc_dostring, | |
816 | .strategy = &sysctl_string, | |
817 | }, | |
818 | #ifdef CONFIG_KEYS | |
819 | { | |
820 | .ctl_name = CTL_UNNUMBERED, | |
821 | .procname = "keys", | |
822 | .mode = 0555, | |
823 | .child = key_sysctls, | |
824 | }, | |
825 | #endif | |
826 | #ifdef CONFIG_RCU_TORTURE_TEST | |
827 | { | |
828 | .ctl_name = CTL_UNNUMBERED, | |
829 | .procname = "rcutorture_runnable", | |
830 | .data = &rcutorture_runnable, | |
831 | .maxlen = sizeof(int), | |
832 | .mode = 0644, | |
833 | .proc_handler = &proc_dointvec, | |
834 | }, | |
835 | #endif | |
836 | /* | |
837 | * NOTE: do not add new entries to this table unless you have read | |
838 | * Documentation/sysctl/ctl_unnumbered.txt | |
839 | */ | |
840 | { .ctl_name = 0 } | |
841 | }; | |
842 | ||
843 | static struct ctl_table vm_table[] = { | |
844 | { | |
845 | .ctl_name = VM_OVERCOMMIT_MEMORY, | |
846 | .procname = "overcommit_memory", | |
847 | .data = &sysctl_overcommit_memory, | |
848 | .maxlen = sizeof(sysctl_overcommit_memory), | |
849 | .mode = 0644, | |
850 | .proc_handler = &proc_dointvec, | |
851 | }, | |
852 | { | |
853 | .ctl_name = VM_PANIC_ON_OOM, | |
854 | .procname = "panic_on_oom", | |
855 | .data = &sysctl_panic_on_oom, | |
856 | .maxlen = sizeof(sysctl_panic_on_oom), | |
857 | .mode = 0644, | |
858 | .proc_handler = &proc_dointvec, | |
859 | }, | |
860 | { | |
861 | .ctl_name = CTL_UNNUMBERED, | |
862 | .procname = "oom_kill_allocating_task", | |
863 | .data = &sysctl_oom_kill_allocating_task, | |
864 | .maxlen = sizeof(sysctl_oom_kill_allocating_task), | |
865 | .mode = 0644, | |
866 | .proc_handler = &proc_dointvec, | |
867 | }, | |
868 | { | |
869 | .ctl_name = CTL_UNNUMBERED, | |
870 | .procname = "oom_dump_tasks", | |
871 | .data = &sysctl_oom_dump_tasks, | |
872 | .maxlen = sizeof(sysctl_oom_dump_tasks), | |
873 | .mode = 0644, | |
874 | .proc_handler = &proc_dointvec, | |
875 | }, | |
876 | { | |
877 | .ctl_name = VM_OVERCOMMIT_RATIO, | |
878 | .procname = "overcommit_ratio", | |
879 | .data = &sysctl_overcommit_ratio, | |
880 | .maxlen = sizeof(sysctl_overcommit_ratio), | |
881 | .mode = 0644, | |
882 | .proc_handler = &proc_dointvec, | |
883 | }, | |
884 | { | |
885 | .ctl_name = VM_PAGE_CLUSTER, | |
886 | .procname = "page-cluster", | |
887 | .data = &page_cluster, | |
888 | .maxlen = sizeof(int), | |
889 | .mode = 0644, | |
890 | .proc_handler = &proc_dointvec, | |
891 | }, | |
892 | { | |
893 | .ctl_name = VM_DIRTY_BACKGROUND, | |
894 | .procname = "dirty_background_ratio", | |
895 | .data = &dirty_background_ratio, | |
896 | .maxlen = sizeof(dirty_background_ratio), | |
897 | .mode = 0644, | |
898 | .proc_handler = &proc_dointvec_minmax, | |
899 | .strategy = &sysctl_intvec, | |
900 | .extra1 = &zero, | |
901 | .extra2 = &one_hundred, | |
902 | }, | |
903 | { | |
904 | .ctl_name = VM_DIRTY_RATIO, | |
905 | .procname = "dirty_ratio", | |
906 | .data = &vm_dirty_ratio, | |
907 | .maxlen = sizeof(vm_dirty_ratio), | |
908 | .mode = 0644, | |
909 | .proc_handler = &dirty_ratio_handler, | |
910 | .strategy = &sysctl_intvec, | |
911 | .extra1 = &zero, | |
912 | .extra2 = &one_hundred, | |
913 | }, | |
914 | { | |
915 | .procname = "dirty_writeback_centisecs", | |
916 | .data = &dirty_writeback_interval, | |
917 | .maxlen = sizeof(dirty_writeback_interval), | |
918 | .mode = 0644, | |
919 | .proc_handler = &dirty_writeback_centisecs_handler, | |
920 | }, | |
921 | { | |
922 | .procname = "dirty_expire_centisecs", | |
923 | .data = &dirty_expire_interval, | |
924 | .maxlen = sizeof(dirty_expire_interval), | |
925 | .mode = 0644, | |
926 | .proc_handler = &proc_dointvec_userhz_jiffies, | |
927 | }, | |
928 | { | |
929 | .ctl_name = VM_NR_PDFLUSH_THREADS, | |
930 | .procname = "nr_pdflush_threads", | |
931 | .data = &nr_pdflush_threads, | |
932 | .maxlen = sizeof nr_pdflush_threads, | |
933 | .mode = 0444 /* read-only*/, | |
934 | .proc_handler = &proc_dointvec, | |
935 | }, | |
936 | { | |
937 | .ctl_name = VM_SWAPPINESS, | |
938 | .procname = "swappiness", | |
939 | .data = &vm_swappiness, | |
940 | .maxlen = sizeof(vm_swappiness), | |
941 | .mode = 0644, | |
942 | .proc_handler = &proc_dointvec_minmax, | |
943 | .strategy = &sysctl_intvec, | |
944 | .extra1 = &zero, | |
945 | .extra2 = &one_hundred, | |
946 | }, | |
947 | #ifdef CONFIG_HUGETLB_PAGE | |
948 | { | |
949 | .procname = "nr_hugepages", | |
950 | .data = NULL, | |
951 | .maxlen = sizeof(unsigned long), | |
952 | .mode = 0644, | |
953 | .proc_handler = &hugetlb_sysctl_handler, | |
954 | .extra1 = (void *)&hugetlb_zero, | |
955 | .extra2 = (void *)&hugetlb_infinity, | |
956 | }, | |
957 | { | |
958 | .ctl_name = VM_HUGETLB_GROUP, | |
959 | .procname = "hugetlb_shm_group", | |
960 | .data = &sysctl_hugetlb_shm_group, | |
961 | .maxlen = sizeof(gid_t), | |
962 | .mode = 0644, | |
963 | .proc_handler = &proc_dointvec, | |
964 | }, | |
965 | { | |
966 | .ctl_name = CTL_UNNUMBERED, | |
967 | .procname = "hugepages_treat_as_movable", | |
968 | .data = &hugepages_treat_as_movable, | |
969 | .maxlen = sizeof(int), | |
970 | .mode = 0644, | |
971 | .proc_handler = &hugetlb_treat_movable_handler, | |
972 | }, | |
973 | { | |
974 | .ctl_name = CTL_UNNUMBERED, | |
975 | .procname = "nr_overcommit_hugepages", | |
976 | .data = NULL, | |
977 | .maxlen = sizeof(unsigned long), | |
978 | .mode = 0644, | |
979 | .proc_handler = &hugetlb_overcommit_handler, | |
980 | .extra1 = (void *)&hugetlb_zero, | |
981 | .extra2 = (void *)&hugetlb_infinity, | |
982 | }, | |
983 | #endif | |
984 | { | |
985 | .ctl_name = VM_LOWMEM_RESERVE_RATIO, | |
986 | .procname = "lowmem_reserve_ratio", | |
987 | .data = &sysctl_lowmem_reserve_ratio, | |
988 | .maxlen = sizeof(sysctl_lowmem_reserve_ratio), | |
989 | .mode = 0644, | |
990 | .proc_handler = &lowmem_reserve_ratio_sysctl_handler, | |
991 | .strategy = &sysctl_intvec, | |
992 | }, | |
993 | { | |
994 | .ctl_name = VM_DROP_PAGECACHE, | |
995 | .procname = "drop_caches", | |
996 | .data = &sysctl_drop_caches, | |
997 | .maxlen = sizeof(int), | |
998 | .mode = 0644, | |
999 | .proc_handler = drop_caches_sysctl_handler, | |
1000 | .strategy = &sysctl_intvec, | |
1001 | }, | |
1002 | { | |
1003 | .ctl_name = VM_MIN_FREE_KBYTES, | |
1004 | .procname = "min_free_kbytes", | |
1005 | .data = &min_free_kbytes, | |
1006 | .maxlen = sizeof(min_free_kbytes), | |
1007 | .mode = 0644, | |
1008 | .proc_handler = &min_free_kbytes_sysctl_handler, | |
1009 | .strategy = &sysctl_intvec, | |
1010 | .extra1 = &zero, | |
1011 | }, | |
1012 | { | |
1013 | .ctl_name = VM_PERCPU_PAGELIST_FRACTION, | |
1014 | .procname = "percpu_pagelist_fraction", | |
1015 | .data = &percpu_pagelist_fraction, | |
1016 | .maxlen = sizeof(percpu_pagelist_fraction), | |
1017 | .mode = 0644, | |
1018 | .proc_handler = &percpu_pagelist_fraction_sysctl_handler, | |
1019 | .strategy = &sysctl_intvec, | |
1020 | .extra1 = &min_percpu_pagelist_fract, | |
1021 | }, | |
1022 | #ifdef CONFIG_MMU | |
1023 | { | |
1024 | .ctl_name = VM_MAX_MAP_COUNT, | |
1025 | .procname = "max_map_count", | |
1026 | .data = &sysctl_max_map_count, | |
1027 | .maxlen = sizeof(sysctl_max_map_count), | |
1028 | .mode = 0644, | |
1029 | .proc_handler = &proc_dointvec | |
1030 | }, | |
1031 | #endif | |
1032 | { | |
1033 | .ctl_name = VM_LAPTOP_MODE, | |
1034 | .procname = "laptop_mode", | |
1035 | .data = &laptop_mode, | |
1036 | .maxlen = sizeof(laptop_mode), | |
1037 | .mode = 0644, | |
1038 | .proc_handler = &proc_dointvec_jiffies, | |
1039 | .strategy = &sysctl_jiffies, | |
1040 | }, | |
1041 | { | |
1042 | .ctl_name = VM_BLOCK_DUMP, | |
1043 | .procname = "block_dump", | |
1044 | .data = &block_dump, | |
1045 | .maxlen = sizeof(block_dump), | |
1046 | .mode = 0644, | |
1047 | .proc_handler = &proc_dointvec, | |
1048 | .strategy = &sysctl_intvec, | |
1049 | .extra1 = &zero, | |
1050 | }, | |
1051 | { | |
1052 | .ctl_name = VM_VFS_CACHE_PRESSURE, | |
1053 | .procname = "vfs_cache_pressure", | |
1054 | .data = &sysctl_vfs_cache_pressure, | |
1055 | .maxlen = sizeof(sysctl_vfs_cache_pressure), | |
1056 | .mode = 0644, | |
1057 | .proc_handler = &proc_dointvec, | |
1058 | .strategy = &sysctl_intvec, | |
1059 | .extra1 = &zero, | |
1060 | }, | |
1061 | #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT | |
1062 | { | |
1063 | .ctl_name = VM_LEGACY_VA_LAYOUT, | |
1064 | .procname = "legacy_va_layout", | |
1065 | .data = &sysctl_legacy_va_layout, | |
1066 | .maxlen = sizeof(sysctl_legacy_va_layout), | |
1067 | .mode = 0644, | |
1068 | .proc_handler = &proc_dointvec, | |
1069 | .strategy = &sysctl_intvec, | |
1070 | .extra1 = &zero, | |
1071 | }, | |
1072 | #endif | |
1073 | #ifdef CONFIG_NUMA | |
1074 | { | |
1075 | .ctl_name = VM_ZONE_RECLAIM_MODE, | |
1076 | .procname = "zone_reclaim_mode", | |
1077 | .data = &zone_reclaim_mode, | |
1078 | .maxlen = sizeof(zone_reclaim_mode), | |
1079 | .mode = 0644, | |
1080 | .proc_handler = &proc_dointvec, | |
1081 | .strategy = &sysctl_intvec, | |
1082 | .extra1 = &zero, | |
1083 | }, | |
1084 | { | |
1085 | .ctl_name = VM_MIN_UNMAPPED, | |
1086 | .procname = "min_unmapped_ratio", | |
1087 | .data = &sysctl_min_unmapped_ratio, | |
1088 | .maxlen = sizeof(sysctl_min_unmapped_ratio), | |
1089 | .mode = 0644, | |
1090 | .proc_handler = &sysctl_min_unmapped_ratio_sysctl_handler, | |
1091 | .strategy = &sysctl_intvec, | |
1092 | .extra1 = &zero, | |
1093 | .extra2 = &one_hundred, | |
1094 | }, | |
1095 | { | |
1096 | .ctl_name = VM_MIN_SLAB, | |
1097 | .procname = "min_slab_ratio", | |
1098 | .data = &sysctl_min_slab_ratio, | |
1099 | .maxlen = sizeof(sysctl_min_slab_ratio), | |
1100 | .mode = 0644, | |
1101 | .proc_handler = &sysctl_min_slab_ratio_sysctl_handler, | |
1102 | .strategy = &sysctl_intvec, | |
1103 | .extra1 = &zero, | |
1104 | .extra2 = &one_hundred, | |
1105 | }, | |
1106 | #endif | |
1107 | #ifdef CONFIG_SMP | |
1108 | { | |
1109 | .ctl_name = CTL_UNNUMBERED, | |
1110 | .procname = "stat_interval", | |
1111 | .data = &sysctl_stat_interval, | |
1112 | .maxlen = sizeof(sysctl_stat_interval), | |
1113 | .mode = 0644, | |
1114 | .proc_handler = &proc_dointvec_jiffies, | |
1115 | .strategy = &sysctl_jiffies, | |
1116 | }, | |
1117 | #endif | |
1118 | #ifdef CONFIG_SECURITY | |
1119 | { | |
1120 | .ctl_name = CTL_UNNUMBERED, | |
1121 | .procname = "mmap_min_addr", | |
1122 | .data = &mmap_min_addr, | |
1123 | .maxlen = sizeof(unsigned long), | |
1124 | .mode = 0644, | |
1125 | .proc_handler = &proc_doulongvec_minmax, | |
1126 | }, | |
1127 | #endif | |
1128 | #ifdef CONFIG_NUMA | |
1129 | { | |
1130 | .ctl_name = CTL_UNNUMBERED, | |
1131 | .procname = "numa_zonelist_order", | |
1132 | .data = &numa_zonelist_order, | |
1133 | .maxlen = NUMA_ZONELIST_ORDER_LEN, | |
1134 | .mode = 0644, | |
1135 | .proc_handler = &numa_zonelist_order_handler, | |
1136 | .strategy = &sysctl_string, | |
1137 | }, | |
1138 | #endif | |
1139 | #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \ | |
1140 | (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL)) | |
1141 | { | |
1142 | .ctl_name = VM_VDSO_ENABLED, | |
1143 | .procname = "vdso_enabled", | |
1144 | .data = &vdso_enabled, | |
1145 | .maxlen = sizeof(vdso_enabled), | |
1146 | .mode = 0644, | |
1147 | .proc_handler = &proc_dointvec, | |
1148 | .strategy = &sysctl_intvec, | |
1149 | .extra1 = &zero, | |
1150 | }, | |
1151 | #endif | |
1152 | #ifdef CONFIG_HIGHMEM | |
1153 | { | |
1154 | .ctl_name = CTL_UNNUMBERED, | |
1155 | .procname = "highmem_is_dirtyable", | |
1156 | .data = &vm_highmem_is_dirtyable, | |
1157 | .maxlen = sizeof(vm_highmem_is_dirtyable), | |
1158 | .mode = 0644, | |
1159 | .proc_handler = &proc_dointvec_minmax, | |
1160 | .strategy = &sysctl_intvec, | |
1161 | .extra1 = &zero, | |
1162 | .extra2 = &one, | |
1163 | }, | |
1164 | #endif | |
1165 | /* | |
1166 | * NOTE: do not add new entries to this table unless you have read | |
1167 | * Documentation/sysctl/ctl_unnumbered.txt | |
1168 | */ | |
1169 | { .ctl_name = 0 } | |
1170 | }; | |
1171 | ||
1172 | #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) | |
1173 | static struct ctl_table binfmt_misc_table[] = { | |
1174 | { .ctl_name = 0 } | |
1175 | }; | |
1176 | #endif | |
1177 | ||
1178 | static struct ctl_table fs_table[] = { | |
1179 | { | |
1180 | .ctl_name = FS_NRINODE, | |
1181 | .procname = "inode-nr", | |
1182 | .data = &inodes_stat, | |
1183 | .maxlen = 2*sizeof(int), | |
1184 | .mode = 0444, | |
1185 | .proc_handler = &proc_dointvec, | |
1186 | }, | |
1187 | { | |
1188 | .ctl_name = FS_STATINODE, | |
1189 | .procname = "inode-state", | |
1190 | .data = &inodes_stat, | |
1191 | .maxlen = 7*sizeof(int), | |
1192 | .mode = 0444, | |
1193 | .proc_handler = &proc_dointvec, | |
1194 | }, | |
1195 | { | |
1196 | .procname = "file-nr", | |
1197 | .data = &files_stat, | |
1198 | .maxlen = 3*sizeof(int), | |
1199 | .mode = 0444, | |
1200 | .proc_handler = &proc_nr_files, | |
1201 | }, | |
1202 | { | |
1203 | .ctl_name = FS_MAXFILE, | |
1204 | .procname = "file-max", | |
1205 | .data = &files_stat.max_files, | |
1206 | .maxlen = sizeof(int), | |
1207 | .mode = 0644, | |
1208 | .proc_handler = &proc_dointvec, | |
1209 | }, | |
1210 | { | |
1211 | .ctl_name = CTL_UNNUMBERED, | |
1212 | .procname = "nr_open", | |
1213 | .data = &sysctl_nr_open, | |
1214 | .maxlen = sizeof(int), | |
1215 | .mode = 0644, | |
1216 | .proc_handler = &proc_dointvec_minmax, | |
1217 | .extra1 = &sysctl_nr_open_min, | |
1218 | .extra2 = &sysctl_nr_open_max, | |
1219 | }, | |
1220 | { | |
1221 | .ctl_name = FS_DENTRY, | |
1222 | .procname = "dentry-state", | |
1223 | .data = &dentry_stat, | |
1224 | .maxlen = 6*sizeof(int), | |
1225 | .mode = 0444, | |
1226 | .proc_handler = &proc_dointvec, | |
1227 | }, | |
1228 | { | |
1229 | .ctl_name = FS_OVERFLOWUID, | |
1230 | .procname = "overflowuid", | |
1231 | .data = &fs_overflowuid, | |
1232 | .maxlen = sizeof(int), | |
1233 | .mode = 0644, | |
1234 | .proc_handler = &proc_dointvec_minmax, | |
1235 | .strategy = &sysctl_intvec, | |
1236 | .extra1 = &minolduid, | |
1237 | .extra2 = &maxolduid, | |
1238 | }, | |
1239 | { | |
1240 | .ctl_name = FS_OVERFLOWGID, | |
1241 | .procname = "overflowgid", | |
1242 | .data = &fs_overflowgid, | |
1243 | .maxlen = sizeof(int), | |
1244 | .mode = 0644, | |
1245 | .proc_handler = &proc_dointvec_minmax, | |
1246 | .strategy = &sysctl_intvec, | |
1247 | .extra1 = &minolduid, | |
1248 | .extra2 = &maxolduid, | |
1249 | }, | |
1250 | #ifdef CONFIG_FILE_LOCKING | |
1251 | { | |
1252 | .ctl_name = FS_LEASES, | |
1253 | .procname = "leases-enable", | |
1254 | .data = &leases_enable, | |
1255 | .maxlen = sizeof(int), | |
1256 | .mode = 0644, | |
1257 | .proc_handler = &proc_dointvec, | |
1258 | }, | |
1259 | #endif | |
1260 | #ifdef CONFIG_DNOTIFY | |
1261 | { | |
1262 | .ctl_name = FS_DIR_NOTIFY, | |
1263 | .procname = "dir-notify-enable", | |
1264 | .data = &dir_notify_enable, | |
1265 | .maxlen = sizeof(int), | |
1266 | .mode = 0644, | |
1267 | .proc_handler = &proc_dointvec, | |
1268 | }, | |
1269 | #endif | |
1270 | #ifdef CONFIG_MMU | |
1271 | #ifdef CONFIG_FILE_LOCKING | |
1272 | { | |
1273 | .ctl_name = FS_LEASE_TIME, | |
1274 | .procname = "lease-break-time", | |
1275 | .data = &lease_break_time, | |
1276 | .maxlen = sizeof(int), | |
1277 | .mode = 0644, | |
1278 | .proc_handler = &proc_dointvec_minmax, | |
1279 | .strategy = &sysctl_intvec, | |
1280 | .extra1 = &zero, | |
1281 | .extra2 = &two, | |
1282 | }, | |
1283 | #endif | |
1284 | { | |
1285 | .procname = "aio-nr", | |
1286 | .data = &aio_nr, | |
1287 | .maxlen = sizeof(aio_nr), | |
1288 | .mode = 0444, | |
1289 | .proc_handler = &proc_doulongvec_minmax, | |
1290 | }, | |
1291 | { | |
1292 | .procname = "aio-max-nr", | |
1293 | .data = &aio_max_nr, | |
1294 | .maxlen = sizeof(aio_max_nr), | |
1295 | .mode = 0644, | |
1296 | .proc_handler = &proc_doulongvec_minmax, | |
1297 | }, | |
1298 | #ifdef CONFIG_INOTIFY_USER | |
1299 | { | |
1300 | .ctl_name = FS_INOTIFY, | |
1301 | .procname = "inotify", | |
1302 | .mode = 0555, | |
1303 | .child = inotify_table, | |
1304 | }, | |
1305 | #endif | |
1306 | #endif | |
1307 | { | |
1308 | .ctl_name = KERN_SETUID_DUMPABLE, | |
1309 | .procname = "suid_dumpable", | |
1310 | .data = &suid_dumpable, | |
1311 | .maxlen = sizeof(int), | |
1312 | .mode = 0644, | |
1313 | .proc_handler = &proc_dointvec, | |
1314 | }, | |
1315 | #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) | |
1316 | { | |
1317 | .ctl_name = CTL_UNNUMBERED, | |
1318 | .procname = "binfmt_misc", | |
1319 | .mode = 0555, | |
1320 | .child = binfmt_misc_table, | |
1321 | }, | |
1322 | #endif | |
1323 | /* | |
1324 | * NOTE: do not add new entries to this table unless you have read | |
1325 | * Documentation/sysctl/ctl_unnumbered.txt | |
1326 | */ | |
1327 | { .ctl_name = 0 } | |
1328 | }; | |
1329 | ||
1330 | static struct ctl_table debug_table[] = { | |
1331 | #if defined(CONFIG_X86) || defined(CONFIG_PPC) | |
1332 | { | |
1333 | .ctl_name = CTL_UNNUMBERED, | |
1334 | .procname = "exception-trace", | |
1335 | .data = &show_unhandled_signals, | |
1336 | .maxlen = sizeof(int), | |
1337 | .mode = 0644, | |
1338 | .proc_handler = proc_dointvec | |
1339 | }, | |
1340 | #endif | |
1341 | { .ctl_name = 0 } | |
1342 | }; | |
1343 | ||
1344 | static struct ctl_table dev_table[] = { | |
1345 | { .ctl_name = 0 } | |
1346 | }; | |
1347 | ||
1348 | static DEFINE_SPINLOCK(sysctl_lock); | |
1349 | ||
1350 | /* called under sysctl_lock */ | |
1351 | static int use_table(struct ctl_table_header *p) | |
1352 | { | |
1353 | if (unlikely(p->unregistering)) | |
1354 | return 0; | |
1355 | p->used++; | |
1356 | return 1; | |
1357 | } | |
1358 | ||
1359 | /* called under sysctl_lock */ | |
1360 | static void unuse_table(struct ctl_table_header *p) | |
1361 | { | |
1362 | if (!--p->used) | |
1363 | if (unlikely(p->unregistering)) | |
1364 | complete(p->unregistering); | |
1365 | } | |
1366 | ||
1367 | /* called under sysctl_lock, will reacquire if has to wait */ | |
1368 | static void start_unregistering(struct ctl_table_header *p) | |
1369 | { | |
1370 | /* | |
1371 | * if p->used is 0, nobody will ever touch that entry again; | |
1372 | * we'll eliminate all paths to it before dropping sysctl_lock | |
1373 | */ | |
1374 | if (unlikely(p->used)) { | |
1375 | struct completion wait; | |
1376 | init_completion(&wait); | |
1377 | p->unregistering = &wait; | |
1378 | spin_unlock(&sysctl_lock); | |
1379 | wait_for_completion(&wait); | |
1380 | spin_lock(&sysctl_lock); | |
1381 | } else { | |
1382 | /* anything non-NULL; we'll never dereference it */ | |
1383 | p->unregistering = ERR_PTR(-EINVAL); | |
1384 | } | |
1385 | /* | |
1386 | * do not remove from the list until nobody holds it; walking the | |
1387 | * list in do_sysctl() relies on that. | |
1388 | */ | |
1389 | list_del_init(&p->ctl_entry); | |
1390 | } | |
1391 | ||
1392 | void sysctl_head_get(struct ctl_table_header *head) | |
1393 | { | |
1394 | spin_lock(&sysctl_lock); | |
1395 | head->count++; | |
1396 | spin_unlock(&sysctl_lock); | |
1397 | } | |
1398 | ||
1399 | void sysctl_head_put(struct ctl_table_header *head) | |
1400 | { | |
1401 | spin_lock(&sysctl_lock); | |
1402 | if (!--head->count) | |
1403 | kfree(head); | |
1404 | spin_unlock(&sysctl_lock); | |
1405 | } | |
1406 | ||
1407 | struct ctl_table_header *sysctl_head_grab(struct ctl_table_header *head) | |
1408 | { | |
1409 | if (!head) | |
1410 | BUG(); | |
1411 | spin_lock(&sysctl_lock); | |
1412 | if (!use_table(head)) | |
1413 | head = ERR_PTR(-ENOENT); | |
1414 | spin_unlock(&sysctl_lock); | |
1415 | return head; | |
1416 | } | |
1417 | ||
1418 | void sysctl_head_finish(struct ctl_table_header *head) | |
1419 | { | |
1420 | if (!head) | |
1421 | return; | |
1422 | spin_lock(&sysctl_lock); | |
1423 | unuse_table(head); | |
1424 | spin_unlock(&sysctl_lock); | |
1425 | } | |
1426 | ||
1427 | static struct ctl_table_set * | |
1428 | lookup_header_set(struct ctl_table_root *root, struct nsproxy *namespaces) | |
1429 | { | |
1430 | struct ctl_table_set *set = &root->default_set; | |
1431 | if (root->lookup) | |
1432 | set = root->lookup(root, namespaces); | |
1433 | return set; | |
1434 | } | |
1435 | ||
1436 | static struct list_head * | |
1437 | lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces) | |
1438 | { | |
1439 | struct ctl_table_set *set = lookup_header_set(root, namespaces); | |
1440 | return &set->list; | |
1441 | } | |
1442 | ||
1443 | struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces, | |
1444 | struct ctl_table_header *prev) | |
1445 | { | |
1446 | struct ctl_table_root *root; | |
1447 | struct list_head *header_list; | |
1448 | struct ctl_table_header *head; | |
1449 | struct list_head *tmp; | |
1450 | ||
1451 | spin_lock(&sysctl_lock); | |
1452 | if (prev) { | |
1453 | head = prev; | |
1454 | tmp = &prev->ctl_entry; | |
1455 | unuse_table(prev); | |
1456 | goto next; | |
1457 | } | |
1458 | tmp = &root_table_header.ctl_entry; | |
1459 | for (;;) { | |
1460 | head = list_entry(tmp, struct ctl_table_header, ctl_entry); | |
1461 | ||
1462 | if (!use_table(head)) | |
1463 | goto next; | |
1464 | spin_unlock(&sysctl_lock); | |
1465 | return head; | |
1466 | next: | |
1467 | root = head->root; | |
1468 | tmp = tmp->next; | |
1469 | header_list = lookup_header_list(root, namespaces); | |
1470 | if (tmp != header_list) | |
1471 | continue; | |
1472 | ||
1473 | do { | |
1474 | root = list_entry(root->root_list.next, | |
1475 | struct ctl_table_root, root_list); | |
1476 | if (root == &sysctl_table_root) | |
1477 | goto out; | |
1478 | header_list = lookup_header_list(root, namespaces); | |
1479 | } while (list_empty(header_list)); | |
1480 | tmp = header_list->next; | |
1481 | } | |
1482 | out: | |
1483 | spin_unlock(&sysctl_lock); | |
1484 | return NULL; | |
1485 | } | |
1486 | ||
1487 | struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev) | |
1488 | { | |
1489 | return __sysctl_head_next(current->nsproxy, prev); | |
1490 | } | |
1491 | ||
1492 | void register_sysctl_root(struct ctl_table_root *root) | |
1493 | { | |
1494 | spin_lock(&sysctl_lock); | |
1495 | list_add_tail(&root->root_list, &sysctl_table_root.root_list); | |
1496 | spin_unlock(&sysctl_lock); | |
1497 | } | |
1498 | ||
1499 | #ifdef CONFIG_SYSCTL_SYSCALL | |
1500 | /* Perform the actual read/write of a sysctl table entry. */ | |
1501 | static int do_sysctl_strategy(struct ctl_table_root *root, | |
1502 | struct ctl_table *table, | |
1503 | void __user *oldval, size_t __user *oldlenp, | |
1504 | void __user *newval, size_t newlen) | |
1505 | { | |
1506 | int op = 0, rc; | |
1507 | ||
1508 | if (oldval) | |
1509 | op |= MAY_READ; | |
1510 | if (newval) | |
1511 | op |= MAY_WRITE; | |
1512 | if (sysctl_perm(root, table, op)) | |
1513 | return -EPERM; | |
1514 | ||
1515 | if (table->strategy) { | |
1516 | rc = table->strategy(table, oldval, oldlenp, newval, newlen); | |
1517 | if (rc < 0) | |
1518 | return rc; | |
1519 | if (rc > 0) | |
1520 | return 0; | |
1521 | } | |
1522 | ||
1523 | /* If there is no strategy routine, or if the strategy returns | |
1524 | * zero, proceed with automatic r/w */ | |
1525 | if (table->data && table->maxlen) { | |
1526 | rc = sysctl_data(table, oldval, oldlenp, newval, newlen); | |
1527 | if (rc < 0) | |
1528 | return rc; | |
1529 | } | |
1530 | return 0; | |
1531 | } | |
1532 | ||
1533 | static int parse_table(int __user *name, int nlen, | |
1534 | void __user *oldval, size_t __user *oldlenp, | |
1535 | void __user *newval, size_t newlen, | |
1536 | struct ctl_table_root *root, | |
1537 | struct ctl_table *table) | |
1538 | { | |
1539 | int n; | |
1540 | repeat: | |
1541 | if (!nlen) | |
1542 | return -ENOTDIR; | |
1543 | if (get_user(n, name)) | |
1544 | return -EFAULT; | |
1545 | for ( ; table->ctl_name || table->procname; table++) { | |
1546 | if (!table->ctl_name) | |
1547 | continue; | |
1548 | if (n == table->ctl_name) { | |
1549 | int error; | |
1550 | if (table->child) { | |
1551 | if (sysctl_perm(root, table, MAY_EXEC)) | |
1552 | return -EPERM; | |
1553 | name++; | |
1554 | nlen--; | |
1555 | table = table->child; | |
1556 | goto repeat; | |
1557 | } | |
1558 | error = do_sysctl_strategy(root, table, | |
1559 | oldval, oldlenp, | |
1560 | newval, newlen); | |
1561 | return error; | |
1562 | } | |
1563 | } | |
1564 | return -ENOTDIR; | |
1565 | } | |
1566 | ||
1567 | int do_sysctl(int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp, | |
1568 | void __user *newval, size_t newlen) | |
1569 | { | |
1570 | struct ctl_table_header *head; | |
1571 | int error = -ENOTDIR; | |
1572 | ||
1573 | if (nlen <= 0 || nlen >= CTL_MAXNAME) | |
1574 | return -ENOTDIR; | |
1575 | if (oldval) { | |
1576 | int old_len; | |
1577 | if (!oldlenp || get_user(old_len, oldlenp)) | |
1578 | return -EFAULT; | |
1579 | } | |
1580 | ||
1581 | for (head = sysctl_head_next(NULL); head; | |
1582 | head = sysctl_head_next(head)) { | |
1583 | error = parse_table(name, nlen, oldval, oldlenp, | |
1584 | newval, newlen, | |
1585 | head->root, head->ctl_table); | |
1586 | if (error != -ENOTDIR) { | |
1587 | sysctl_head_finish(head); | |
1588 | break; | |
1589 | } | |
1590 | } | |
1591 | return error; | |
1592 | } | |
1593 | ||
1594 | asmlinkage long sys_sysctl(struct __sysctl_args __user *args) | |
1595 | { | |
1596 | struct __sysctl_args tmp; | |
1597 | int error; | |
1598 | ||
1599 | if (copy_from_user(&tmp, args, sizeof(tmp))) | |
1600 | return -EFAULT; | |
1601 | ||
1602 | error = deprecated_sysctl_warning(&tmp); | |
1603 | if (error) | |
1604 | goto out; | |
1605 | ||
1606 | lock_kernel(); | |
1607 | error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp, | |
1608 | tmp.newval, tmp.newlen); | |
1609 | unlock_kernel(); | |
1610 | out: | |
1611 | return error; | |
1612 | } | |
1613 | #endif /* CONFIG_SYSCTL_SYSCALL */ | |
1614 | ||
1615 | /* | |
1616 | * sysctl_perm does NOT grant the superuser all rights automatically, because | |
1617 | * some sysctl variables are readonly even to root. | |
1618 | */ | |
1619 | ||
1620 | static int test_perm(int mode, int op) | |
1621 | { | |
1622 | if (!current->euid) | |
1623 | mode >>= 6; | |
1624 | else if (in_egroup_p(0)) | |
1625 | mode >>= 3; | |
1626 | if ((op & ~mode & (MAY_READ|MAY_WRITE|MAY_EXEC)) == 0) | |
1627 | return 0; | |
1628 | return -EACCES; | |
1629 | } | |
1630 | ||
1631 | int sysctl_perm(struct ctl_table_root *root, struct ctl_table *table, int op) | |
1632 | { | |
1633 | int error; | |
1634 | int mode; | |
1635 | ||
1636 | error = security_sysctl(table, op & (MAY_READ | MAY_WRITE | MAY_EXEC)); | |
1637 | if (error) | |
1638 | return error; | |
1639 | ||
1640 | if (root->permissions) | |
1641 | mode = root->permissions(root, current->nsproxy, table); | |
1642 | else | |
1643 | mode = table->mode; | |
1644 | ||
1645 | return test_perm(mode, op); | |
1646 | } | |
1647 | ||
1648 | static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table) | |
1649 | { | |
1650 | for (; table->ctl_name || table->procname; table++) { | |
1651 | table->parent = parent; | |
1652 | if (table->child) | |
1653 | sysctl_set_parent(table, table->child); | |
1654 | } | |
1655 | } | |
1656 | ||
1657 | static __init int sysctl_init(void) | |
1658 | { | |
1659 | sysctl_set_parent(NULL, root_table); | |
1660 | #ifdef CONFIG_SYSCTL_SYSCALL_CHECK | |
1661 | { | |
1662 | int err; | |
1663 | err = sysctl_check_table(current->nsproxy, root_table); | |
1664 | } | |
1665 | #endif | |
1666 | return 0; | |
1667 | } | |
1668 | ||
1669 | core_initcall(sysctl_init); | |
1670 | ||
1671 | static struct ctl_table *is_branch_in(struct ctl_table *branch, | |
1672 | struct ctl_table *table) | |
1673 | { | |
1674 | struct ctl_table *p; | |
1675 | const char *s = branch->procname; | |
1676 | ||
1677 | /* branch should have named subdirectory as its first element */ | |
1678 | if (!s || !branch->child) | |
1679 | return NULL; | |
1680 | ||
1681 | /* ... and nothing else */ | |
1682 | if (branch[1].procname || branch[1].ctl_name) | |
1683 | return NULL; | |
1684 | ||
1685 | /* table should contain subdirectory with the same name */ | |
1686 | for (p = table; p->procname || p->ctl_name; p++) { | |
1687 | if (!p->child) | |
1688 | continue; | |
1689 | if (p->procname && strcmp(p->procname, s) == 0) | |
1690 | return p; | |
1691 | } | |
1692 | return NULL; | |
1693 | } | |
1694 | ||
1695 | /* see if attaching q to p would be an improvement */ | |
1696 | static void try_attach(struct ctl_table_header *p, struct ctl_table_header *q) | |
1697 | { | |
1698 | struct ctl_table *to = p->ctl_table, *by = q->ctl_table; | |
1699 | struct ctl_table *next; | |
1700 | int is_better = 0; | |
1701 | int not_in_parent = !p->attached_by; | |
1702 | ||
1703 | while ((next = is_branch_in(by, to)) != NULL) { | |
1704 | if (by == q->attached_by) | |
1705 | is_better = 1; | |
1706 | if (to == p->attached_by) | |
1707 | not_in_parent = 1; | |
1708 | by = by->child; | |
1709 | to = next->child; | |
1710 | } | |
1711 | ||
1712 | if (is_better && not_in_parent) { | |
1713 | q->attached_by = by; | |
1714 | q->attached_to = to; | |
1715 | q->parent = p; | |
1716 | } | |
1717 | } | |
1718 | ||
1719 | /** | |
1720 | * __register_sysctl_paths - register a sysctl hierarchy | |
1721 | * @root: List of sysctl headers to register on | |
1722 | * @namespaces: Data to compute which lists of sysctl entries are visible | |
1723 | * @path: The path to the directory the sysctl table is in. | |
1724 | * @table: the top-level table structure | |
1725 | * | |
1726 | * Register a sysctl table hierarchy. @table should be a filled in ctl_table | |
1727 | * array. A completely 0 filled entry terminates the table. | |
1728 | * | |
1729 | * The members of the &struct ctl_table structure are used as follows: | |
1730 | * | |
1731 | * ctl_name - This is the numeric sysctl value used by sysctl(2). The number | |
1732 | * must be unique within that level of sysctl | |
1733 | * | |
1734 | * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not | |
1735 | * enter a sysctl file | |
1736 | * | |
1737 | * data - a pointer to data for use by proc_handler | |
1738 | * | |
1739 | * maxlen - the maximum size in bytes of the data | |
1740 | * | |
1741 | * mode - the file permissions for the /proc/sys file, and for sysctl(2) | |
1742 | * | |
1743 | * child - a pointer to the child sysctl table if this entry is a directory, or | |
1744 | * %NULL. | |
1745 | * | |
1746 | * proc_handler - the text handler routine (described below) | |
1747 | * | |
1748 | * strategy - the strategy routine (described below) | |
1749 | * | |
1750 | * de - for internal use by the sysctl routines | |
1751 | * | |
1752 | * extra1, extra2 - extra pointers usable by the proc handler routines | |
1753 | * | |
1754 | * Leaf nodes in the sysctl tree will be represented by a single file | |
1755 | * under /proc; non-leaf nodes will be represented by directories. | |
1756 | * | |
1757 | * sysctl(2) can automatically manage read and write requests through | |
1758 | * the sysctl table. The data and maxlen fields of the ctl_table | |
1759 | * struct enable minimal validation of the values being written to be | |
1760 | * performed, and the mode field allows minimal authentication. | |
1761 | * | |
1762 | * More sophisticated management can be enabled by the provision of a | |
1763 | * strategy routine with the table entry. This will be called before | |
1764 | * any automatic read or write of the data is performed. | |
1765 | * | |
1766 | * The strategy routine may return | |
1767 | * | |
1768 | * < 0 - Error occurred (error is passed to user process) | |
1769 | * | |
1770 | * 0 - OK - proceed with automatic read or write. | |
1771 | * | |
1772 | * > 0 - OK - read or write has been done by the strategy routine, so | |
1773 | * return immediately. | |
1774 | * | |
1775 | * There must be a proc_handler routine for any terminal nodes | |
1776 | * mirrored under /proc/sys (non-terminals are handled by a built-in | |
1777 | * directory handler). Several default handlers are available to | |
1778 | * cover common cases - | |
1779 | * | |
1780 | * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(), | |
1781 | * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(), | |
1782 | * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax() | |
1783 | * | |
1784 | * It is the handler's job to read the input buffer from user memory | |
1785 | * and process it. The handler should return 0 on success. | |
1786 | * | |
1787 | * This routine returns %NULL on a failure to register, and a pointer | |
1788 | * to the table header on success. | |
1789 | */ | |
1790 | struct ctl_table_header *__register_sysctl_paths( | |
1791 | struct ctl_table_root *root, | |
1792 | struct nsproxy *namespaces, | |
1793 | const struct ctl_path *path, struct ctl_table *table) | |
1794 | { | |
1795 | struct ctl_table_header *header; | |
1796 | struct ctl_table *new, **prevp; | |
1797 | unsigned int n, npath; | |
1798 | struct ctl_table_set *set; | |
1799 | ||
1800 | /* Count the path components */ | |
1801 | for (npath = 0; path[npath].ctl_name || path[npath].procname; ++npath) | |
1802 | ; | |
1803 | ||
1804 | /* | |
1805 | * For each path component, allocate a 2-element ctl_table array. | |
1806 | * The first array element will be filled with the sysctl entry | |
1807 | * for this, the second will be the sentinel (ctl_name == 0). | |
1808 | * | |
1809 | * We allocate everything in one go so that we don't have to | |
1810 | * worry about freeing additional memory in unregister_sysctl_table. | |
1811 | */ | |
1812 | header = kzalloc(sizeof(struct ctl_table_header) + | |
1813 | (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL); | |
1814 | if (!header) | |
1815 | return NULL; | |
1816 | ||
1817 | new = (struct ctl_table *) (header + 1); | |
1818 | ||
1819 | /* Now connect the dots */ | |
1820 | prevp = &header->ctl_table; | |
1821 | for (n = 0; n < npath; ++n, ++path) { | |
1822 | /* Copy the procname */ | |
1823 | new->procname = path->procname; | |
1824 | new->ctl_name = path->ctl_name; | |
1825 | new->mode = 0555; | |
1826 | ||
1827 | *prevp = new; | |
1828 | prevp = &new->child; | |
1829 | ||
1830 | new += 2; | |
1831 | } | |
1832 | *prevp = table; | |
1833 | header->ctl_table_arg = table; | |
1834 | ||
1835 | INIT_LIST_HEAD(&header->ctl_entry); | |
1836 | header->used = 0; | |
1837 | header->unregistering = NULL; | |
1838 | header->root = root; | |
1839 | sysctl_set_parent(NULL, header->ctl_table); | |
1840 | header->count = 1; | |
1841 | #ifdef CONFIG_SYSCTL_SYSCALL_CHECK | |
1842 | if (sysctl_check_table(namespaces, header->ctl_table)) { | |
1843 | kfree(header); | |
1844 | return NULL; | |
1845 | } | |
1846 | #endif | |
1847 | spin_lock(&sysctl_lock); | |
1848 | header->set = lookup_header_set(root, namespaces); | |
1849 | header->attached_by = header->ctl_table; | |
1850 | header->attached_to = root_table; | |
1851 | header->parent = &root_table_header; | |
1852 | for (set = header->set; set; set = set->parent) { | |
1853 | struct ctl_table_header *p; | |
1854 | list_for_each_entry(p, &set->list, ctl_entry) { | |
1855 | if (p->unregistering) | |
1856 | continue; | |
1857 | try_attach(p, header); | |
1858 | } | |
1859 | } | |
1860 | header->parent->count++; | |
1861 | list_add_tail(&header->ctl_entry, &header->set->list); | |
1862 | spin_unlock(&sysctl_lock); | |
1863 | ||
1864 | return header; | |
1865 | } | |
1866 | ||
1867 | /** | |
1868 | * register_sysctl_table_path - register a sysctl table hierarchy | |
1869 | * @path: The path to the directory the sysctl table is in. | |
1870 | * @table: the top-level table structure | |
1871 | * | |
1872 | * Register a sysctl table hierarchy. @table should be a filled in ctl_table | |
1873 | * array. A completely 0 filled entry terminates the table. | |
1874 | * | |
1875 | * See __register_sysctl_paths for more details. | |
1876 | */ | |
1877 | struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path, | |
1878 | struct ctl_table *table) | |
1879 | { | |
1880 | return __register_sysctl_paths(&sysctl_table_root, current->nsproxy, | |
1881 | path, table); | |
1882 | } | |
1883 | ||
1884 | /** | |
1885 | * register_sysctl_table - register a sysctl table hierarchy | |
1886 | * @table: the top-level table structure | |
1887 | * | |
1888 | * Register a sysctl table hierarchy. @table should be a filled in ctl_table | |
1889 | * array. A completely 0 filled entry terminates the table. | |
1890 | * | |
1891 | * See register_sysctl_paths for more details. | |
1892 | */ | |
1893 | struct ctl_table_header *register_sysctl_table(struct ctl_table *table) | |
1894 | { | |
1895 | static const struct ctl_path null_path[] = { {} }; | |
1896 | ||
1897 | return register_sysctl_paths(null_path, table); | |
1898 | } | |
1899 | ||
1900 | /** | |
1901 | * unregister_sysctl_table - unregister a sysctl table hierarchy | |
1902 | * @header: the header returned from register_sysctl_table | |
1903 | * | |
1904 | * Unregisters the sysctl table and all children. proc entries may not | |
1905 | * actually be removed until they are no longer used by anyone. | |
1906 | */ | |
1907 | void unregister_sysctl_table(struct ctl_table_header * header) | |
1908 | { | |
1909 | might_sleep(); | |
1910 | ||
1911 | if (header == NULL) | |
1912 | return; | |
1913 | ||
1914 | spin_lock(&sysctl_lock); | |
1915 | start_unregistering(header); | |
1916 | if (!--header->parent->count) { | |
1917 | WARN_ON(1); | |
1918 | kfree(header->parent); | |
1919 | } | |
1920 | if (!--header->count) | |
1921 | kfree(header); | |
1922 | spin_unlock(&sysctl_lock); | |
1923 | } | |
1924 | ||
1925 | int sysctl_is_seen(struct ctl_table_header *p) | |
1926 | { | |
1927 | struct ctl_table_set *set = p->set; | |
1928 | int res; | |
1929 | spin_lock(&sysctl_lock); | |
1930 | if (p->unregistering) | |
1931 | res = 0; | |
1932 | else if (!set->is_seen) | |
1933 | res = 1; | |
1934 | else | |
1935 | res = set->is_seen(set); | |
1936 | spin_unlock(&sysctl_lock); | |
1937 | return res; | |
1938 | } | |
1939 | ||
1940 | void setup_sysctl_set(struct ctl_table_set *p, | |
1941 | struct ctl_table_set *parent, | |
1942 | int (*is_seen)(struct ctl_table_set *)) | |
1943 | { | |
1944 | INIT_LIST_HEAD(&p->list); | |
1945 | p->parent = parent ? parent : &sysctl_table_root.default_set; | |
1946 | p->is_seen = is_seen; | |
1947 | } | |
1948 | ||
1949 | #else /* !CONFIG_SYSCTL */ | |
1950 | struct ctl_table_header *register_sysctl_table(struct ctl_table * table) | |
1951 | { | |
1952 | return NULL; | |
1953 | } | |
1954 | ||
1955 | struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path, | |
1956 | struct ctl_table *table) | |
1957 | { | |
1958 | return NULL; | |
1959 | } | |
1960 | ||
1961 | void unregister_sysctl_table(struct ctl_table_header * table) | |
1962 | { | |
1963 | } | |
1964 | ||
1965 | void setup_sysctl_set(struct ctl_table_set *p, | |
1966 | struct ctl_table_set *parent, | |
1967 | int (*is_seen)(struct ctl_table_set *)) | |
1968 | { | |
1969 | } | |
1970 | ||
1971 | void sysctl_head_put(struct ctl_table_header *head) | |
1972 | { | |
1973 | } | |
1974 | ||
1975 | #endif /* CONFIG_SYSCTL */ | |
1976 | ||
1977 | /* | |
1978 | * /proc/sys support | |
1979 | */ | |
1980 | ||
1981 | #ifdef CONFIG_PROC_SYSCTL | |
1982 | ||
1983 | static int _proc_do_string(void* data, int maxlen, int write, | |
1984 | struct file *filp, void __user *buffer, | |
1985 | size_t *lenp, loff_t *ppos) | |
1986 | { | |
1987 | size_t len; | |
1988 | char __user *p; | |
1989 | char c; | |
1990 | ||
1991 | if (!data || !maxlen || !*lenp) { | |
1992 | *lenp = 0; | |
1993 | return 0; | |
1994 | } | |
1995 | ||
1996 | if (write) { | |
1997 | len = 0; | |
1998 | p = buffer; | |
1999 | while (len < *lenp) { | |
2000 | if (get_user(c, p++)) | |
2001 | return -EFAULT; | |
2002 | if (c == 0 || c == '\n') | |
2003 | break; | |
2004 | len++; | |
2005 | } | |
2006 | if (len >= maxlen) | |
2007 | len = maxlen-1; | |
2008 | if(copy_from_user(data, buffer, len)) | |
2009 | return -EFAULT; | |
2010 | ((char *) data)[len] = 0; | |
2011 | *ppos += *lenp; | |
2012 | } else { | |
2013 | len = strlen(data); | |
2014 | if (len > maxlen) | |
2015 | len = maxlen; | |
2016 | ||
2017 | if (*ppos > len) { | |
2018 | *lenp = 0; | |
2019 | return 0; | |
2020 | } | |
2021 | ||
2022 | data += *ppos; | |
2023 | len -= *ppos; | |
2024 | ||
2025 | if (len > *lenp) | |
2026 | len = *lenp; | |
2027 | if (len) | |
2028 | if(copy_to_user(buffer, data, len)) | |
2029 | return -EFAULT; | |
2030 | if (len < *lenp) { | |
2031 | if(put_user('\n', ((char __user *) buffer) + len)) | |
2032 | return -EFAULT; | |
2033 | len++; | |
2034 | } | |
2035 | *lenp = len; | |
2036 | *ppos += len; | |
2037 | } | |
2038 | return 0; | |
2039 | } | |
2040 | ||
2041 | /** | |
2042 | * proc_dostring - read a string sysctl | |
2043 | * @table: the sysctl table | |
2044 | * @write: %TRUE if this is a write to the sysctl file | |
2045 | * @filp: the file structure | |
2046 | * @buffer: the user buffer | |
2047 | * @lenp: the size of the user buffer | |
2048 | * @ppos: file position | |
2049 | * | |
2050 | * Reads/writes a string from/to the user buffer. If the kernel | |
2051 | * buffer provided is not large enough to hold the string, the | |
2052 | * string is truncated. The copied string is %NULL-terminated. | |
2053 | * If the string is being read by the user process, it is copied | |
2054 | * and a newline '\n' is added. It is truncated if the buffer is | |
2055 | * not large enough. | |
2056 | * | |
2057 | * Returns 0 on success. | |
2058 | */ | |
2059 | int proc_dostring(struct ctl_table *table, int write, struct file *filp, | |
2060 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2061 | { | |
2062 | return _proc_do_string(table->data, table->maxlen, write, filp, | |
2063 | buffer, lenp, ppos); | |
2064 | } | |
2065 | ||
2066 | ||
2067 | static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp, | |
2068 | int *valp, | |
2069 | int write, void *data) | |
2070 | { | |
2071 | if (write) { | |
2072 | *valp = *negp ? -*lvalp : *lvalp; | |
2073 | } else { | |
2074 | int val = *valp; | |
2075 | if (val < 0) { | |
2076 | *negp = -1; | |
2077 | *lvalp = (unsigned long)-val; | |
2078 | } else { | |
2079 | *negp = 0; | |
2080 | *lvalp = (unsigned long)val; | |
2081 | } | |
2082 | } | |
2083 | return 0; | |
2084 | } | |
2085 | ||
2086 | static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table, | |
2087 | int write, struct file *filp, void __user *buffer, | |
2088 | size_t *lenp, loff_t *ppos, | |
2089 | int (*conv)(int *negp, unsigned long *lvalp, int *valp, | |
2090 | int write, void *data), | |
2091 | void *data) | |
2092 | { | |
2093 | #define TMPBUFLEN 21 | |
2094 | int *i, vleft, first=1, neg, val; | |
2095 | unsigned long lval; | |
2096 | size_t left, len; | |
2097 | ||
2098 | char buf[TMPBUFLEN], *p; | |
2099 | char __user *s = buffer; | |
2100 | ||
2101 | if (!tbl_data || !table->maxlen || !*lenp || | |
2102 | (*ppos && !write)) { | |
2103 | *lenp = 0; | |
2104 | return 0; | |
2105 | } | |
2106 | ||
2107 | i = (int *) tbl_data; | |
2108 | vleft = table->maxlen / sizeof(*i); | |
2109 | left = *lenp; | |
2110 | ||
2111 | if (!conv) | |
2112 | conv = do_proc_dointvec_conv; | |
2113 | ||
2114 | for (; left && vleft--; i++, first=0) { | |
2115 | if (write) { | |
2116 | while (left) { | |
2117 | char c; | |
2118 | if (get_user(c, s)) | |
2119 | return -EFAULT; | |
2120 | if (!isspace(c)) | |
2121 | break; | |
2122 | left--; | |
2123 | s++; | |
2124 | } | |
2125 | if (!left) | |
2126 | break; | |
2127 | neg = 0; | |
2128 | len = left; | |
2129 | if (len > sizeof(buf) - 1) | |
2130 | len = sizeof(buf) - 1; | |
2131 | if (copy_from_user(buf, s, len)) | |
2132 | return -EFAULT; | |
2133 | buf[len] = 0; | |
2134 | p = buf; | |
2135 | if (*p == '-' && left > 1) { | |
2136 | neg = 1; | |
2137 | p++; | |
2138 | } | |
2139 | if (*p < '0' || *p > '9') | |
2140 | break; | |
2141 | ||
2142 | lval = simple_strtoul(p, &p, 0); | |
2143 | ||
2144 | len = p-buf; | |
2145 | if ((len < left) && *p && !isspace(*p)) | |
2146 | break; | |
2147 | if (neg) | |
2148 | val = -val; | |
2149 | s += len; | |
2150 | left -= len; | |
2151 | ||
2152 | if (conv(&neg, &lval, i, 1, data)) | |
2153 | break; | |
2154 | } else { | |
2155 | p = buf; | |
2156 | if (!first) | |
2157 | *p++ = '\t'; | |
2158 | ||
2159 | if (conv(&neg, &lval, i, 0, data)) | |
2160 | break; | |
2161 | ||
2162 | sprintf(p, "%s%lu", neg ? "-" : "", lval); | |
2163 | len = strlen(buf); | |
2164 | if (len > left) | |
2165 | len = left; | |
2166 | if(copy_to_user(s, buf, len)) | |
2167 | return -EFAULT; | |
2168 | left -= len; | |
2169 | s += len; | |
2170 | } | |
2171 | } | |
2172 | ||
2173 | if (!write && !first && left) { | |
2174 | if(put_user('\n', s)) | |
2175 | return -EFAULT; | |
2176 | left--, s++; | |
2177 | } | |
2178 | if (write) { | |
2179 | while (left) { | |
2180 | char c; | |
2181 | if (get_user(c, s++)) | |
2182 | return -EFAULT; | |
2183 | if (!isspace(c)) | |
2184 | break; | |
2185 | left--; | |
2186 | } | |
2187 | } | |
2188 | if (write && first) | |
2189 | return -EINVAL; | |
2190 | *lenp -= left; | |
2191 | *ppos += *lenp; | |
2192 | return 0; | |
2193 | #undef TMPBUFLEN | |
2194 | } | |
2195 | ||
2196 | static int do_proc_dointvec(struct ctl_table *table, int write, struct file *filp, | |
2197 | void __user *buffer, size_t *lenp, loff_t *ppos, | |
2198 | int (*conv)(int *negp, unsigned long *lvalp, int *valp, | |
2199 | int write, void *data), | |
2200 | void *data) | |
2201 | { | |
2202 | return __do_proc_dointvec(table->data, table, write, filp, | |
2203 | buffer, lenp, ppos, conv, data); | |
2204 | } | |
2205 | ||
2206 | /** | |
2207 | * proc_dointvec - read a vector of integers | |
2208 | * @table: the sysctl table | |
2209 | * @write: %TRUE if this is a write to the sysctl file | |
2210 | * @filp: the file structure | |
2211 | * @buffer: the user buffer | |
2212 | * @lenp: the size of the user buffer | |
2213 | * @ppos: file position | |
2214 | * | |
2215 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer | |
2216 | * values from/to the user buffer, treated as an ASCII string. | |
2217 | * | |
2218 | * Returns 0 on success. | |
2219 | */ | |
2220 | int proc_dointvec(struct ctl_table *table, int write, struct file *filp, | |
2221 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2222 | { | |
2223 | return do_proc_dointvec(table,write,filp,buffer,lenp,ppos, | |
2224 | NULL,NULL); | |
2225 | } | |
2226 | ||
2227 | /* | |
2228 | * Taint values can only be increased | |
2229 | * This means we can safely use a temporary. | |
2230 | */ | |
2231 | static int proc_taint(struct ctl_table *table, int write, struct file *filp, | |
2232 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2233 | { | |
2234 | struct ctl_table t; | |
2235 | unsigned long tmptaint = get_taint(); | |
2236 | int err; | |
2237 | ||
2238 | if (write && !capable(CAP_SYS_ADMIN)) | |
2239 | return -EPERM; | |
2240 | ||
2241 | t = *table; | |
2242 | t.data = &tmptaint; | |
2243 | err = proc_doulongvec_minmax(&t, write, filp, buffer, lenp, ppos); | |
2244 | if (err < 0) | |
2245 | return err; | |
2246 | ||
2247 | if (write) { | |
2248 | /* | |
2249 | * Poor man's atomic or. Not worth adding a primitive | |
2250 | * to everyone's atomic.h for this | |
2251 | */ | |
2252 | int i; | |
2253 | for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) { | |
2254 | if ((tmptaint >> i) & 1) | |
2255 | add_taint(i); | |
2256 | } | |
2257 | } | |
2258 | ||
2259 | return err; | |
2260 | } | |
2261 | ||
2262 | struct do_proc_dointvec_minmax_conv_param { | |
2263 | int *min; | |
2264 | int *max; | |
2265 | }; | |
2266 | ||
2267 | static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp, | |
2268 | int *valp, | |
2269 | int write, void *data) | |
2270 | { | |
2271 | struct do_proc_dointvec_minmax_conv_param *param = data; | |
2272 | if (write) { | |
2273 | int val = *negp ? -*lvalp : *lvalp; | |
2274 | if ((param->min && *param->min > val) || | |
2275 | (param->max && *param->max < val)) | |
2276 | return -EINVAL; | |
2277 | *valp = val; | |
2278 | } else { | |
2279 | int val = *valp; | |
2280 | if (val < 0) { | |
2281 | *negp = -1; | |
2282 | *lvalp = (unsigned long)-val; | |
2283 | } else { | |
2284 | *negp = 0; | |
2285 | *lvalp = (unsigned long)val; | |
2286 | } | |
2287 | } | |
2288 | return 0; | |
2289 | } | |
2290 | ||
2291 | /** | |
2292 | * proc_dointvec_minmax - read a vector of integers with min/max values | |
2293 | * @table: the sysctl table | |
2294 | * @write: %TRUE if this is a write to the sysctl file | |
2295 | * @filp: the file structure | |
2296 | * @buffer: the user buffer | |
2297 | * @lenp: the size of the user buffer | |
2298 | * @ppos: file position | |
2299 | * | |
2300 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer | |
2301 | * values from/to the user buffer, treated as an ASCII string. | |
2302 | * | |
2303 | * This routine will ensure the values are within the range specified by | |
2304 | * table->extra1 (min) and table->extra2 (max). | |
2305 | * | |
2306 | * Returns 0 on success. | |
2307 | */ | |
2308 | int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp, | |
2309 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2310 | { | |
2311 | struct do_proc_dointvec_minmax_conv_param param = { | |
2312 | .min = (int *) table->extra1, | |
2313 | .max = (int *) table->extra2, | |
2314 | }; | |
2315 | return do_proc_dointvec(table, write, filp, buffer, lenp, ppos, | |
2316 | do_proc_dointvec_minmax_conv, ¶m); | |
2317 | } | |
2318 | ||
2319 | static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write, | |
2320 | struct file *filp, | |
2321 | void __user *buffer, | |
2322 | size_t *lenp, loff_t *ppos, | |
2323 | unsigned long convmul, | |
2324 | unsigned long convdiv) | |
2325 | { | |
2326 | #define TMPBUFLEN 21 | |
2327 | unsigned long *i, *min, *max, val; | |
2328 | int vleft, first=1, neg; | |
2329 | size_t len, left; | |
2330 | char buf[TMPBUFLEN], *p; | |
2331 | char __user *s = buffer; | |
2332 | ||
2333 | if (!data || !table->maxlen || !*lenp || | |
2334 | (*ppos && !write)) { | |
2335 | *lenp = 0; | |
2336 | return 0; | |
2337 | } | |
2338 | ||
2339 | i = (unsigned long *) data; | |
2340 | min = (unsigned long *) table->extra1; | |
2341 | max = (unsigned long *) table->extra2; | |
2342 | vleft = table->maxlen / sizeof(unsigned long); | |
2343 | left = *lenp; | |
2344 | ||
2345 | for (; left && vleft--; i++, min++, max++, first=0) { | |
2346 | if (write) { | |
2347 | while (left) { | |
2348 | char c; | |
2349 | if (get_user(c, s)) | |
2350 | return -EFAULT; | |
2351 | if (!isspace(c)) | |
2352 | break; | |
2353 | left--; | |
2354 | s++; | |
2355 | } | |
2356 | if (!left) | |
2357 | break; | |
2358 | neg = 0; | |
2359 | len = left; | |
2360 | if (len > TMPBUFLEN-1) | |
2361 | len = TMPBUFLEN-1; | |
2362 | if (copy_from_user(buf, s, len)) | |
2363 | return -EFAULT; | |
2364 | buf[len] = 0; | |
2365 | p = buf; | |
2366 | if (*p == '-' && left > 1) { | |
2367 | neg = 1; | |
2368 | p++; | |
2369 | } | |
2370 | if (*p < '0' || *p > '9') | |
2371 | break; | |
2372 | val = simple_strtoul(p, &p, 0) * convmul / convdiv ; | |
2373 | len = p-buf; | |
2374 | if ((len < left) && *p && !isspace(*p)) | |
2375 | break; | |
2376 | if (neg) | |
2377 | val = -val; | |
2378 | s += len; | |
2379 | left -= len; | |
2380 | ||
2381 | if(neg) | |
2382 | continue; | |
2383 | if ((min && val < *min) || (max && val > *max)) | |
2384 | continue; | |
2385 | *i = val; | |
2386 | } else { | |
2387 | p = buf; | |
2388 | if (!first) | |
2389 | *p++ = '\t'; | |
2390 | sprintf(p, "%lu", convdiv * (*i) / convmul); | |
2391 | len = strlen(buf); | |
2392 | if (len > left) | |
2393 | len = left; | |
2394 | if(copy_to_user(s, buf, len)) | |
2395 | return -EFAULT; | |
2396 | left -= len; | |
2397 | s += len; | |
2398 | } | |
2399 | } | |
2400 | ||
2401 | if (!write && !first && left) { | |
2402 | if(put_user('\n', s)) | |
2403 | return -EFAULT; | |
2404 | left--, s++; | |
2405 | } | |
2406 | if (write) { | |
2407 | while (left) { | |
2408 | char c; | |
2409 | if (get_user(c, s++)) | |
2410 | return -EFAULT; | |
2411 | if (!isspace(c)) | |
2412 | break; | |
2413 | left--; | |
2414 | } | |
2415 | } | |
2416 | if (write && first) | |
2417 | return -EINVAL; | |
2418 | *lenp -= left; | |
2419 | *ppos += *lenp; | |
2420 | return 0; | |
2421 | #undef TMPBUFLEN | |
2422 | } | |
2423 | ||
2424 | static int do_proc_doulongvec_minmax(struct ctl_table *table, int write, | |
2425 | struct file *filp, | |
2426 | void __user *buffer, | |
2427 | size_t *lenp, loff_t *ppos, | |
2428 | unsigned long convmul, | |
2429 | unsigned long convdiv) | |
2430 | { | |
2431 | return __do_proc_doulongvec_minmax(table->data, table, write, | |
2432 | filp, buffer, lenp, ppos, convmul, convdiv); | |
2433 | } | |
2434 | ||
2435 | /** | |
2436 | * proc_doulongvec_minmax - read a vector of long integers with min/max values | |
2437 | * @table: the sysctl table | |
2438 | * @write: %TRUE if this is a write to the sysctl file | |
2439 | * @filp: the file structure | |
2440 | * @buffer: the user buffer | |
2441 | * @lenp: the size of the user buffer | |
2442 | * @ppos: file position | |
2443 | * | |
2444 | * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long | |
2445 | * values from/to the user buffer, treated as an ASCII string. | |
2446 | * | |
2447 | * This routine will ensure the values are within the range specified by | |
2448 | * table->extra1 (min) and table->extra2 (max). | |
2449 | * | |
2450 | * Returns 0 on success. | |
2451 | */ | |
2452 | int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp, | |
2453 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2454 | { | |
2455 | return do_proc_doulongvec_minmax(table, write, filp, buffer, lenp, ppos, 1l, 1l); | |
2456 | } | |
2457 | ||
2458 | /** | |
2459 | * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values | |
2460 | * @table: the sysctl table | |
2461 | * @write: %TRUE if this is a write to the sysctl file | |
2462 | * @filp: the file structure | |
2463 | * @buffer: the user buffer | |
2464 | * @lenp: the size of the user buffer | |
2465 | * @ppos: file position | |
2466 | * | |
2467 | * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long | |
2468 | * values from/to the user buffer, treated as an ASCII string. The values | |
2469 | * are treated as milliseconds, and converted to jiffies when they are stored. | |
2470 | * | |
2471 | * This routine will ensure the values are within the range specified by | |
2472 | * table->extra1 (min) and table->extra2 (max). | |
2473 | * | |
2474 | * Returns 0 on success. | |
2475 | */ | |
2476 | int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, | |
2477 | struct file *filp, | |
2478 | void __user *buffer, | |
2479 | size_t *lenp, loff_t *ppos) | |
2480 | { | |
2481 | return do_proc_doulongvec_minmax(table, write, filp, buffer, | |
2482 | lenp, ppos, HZ, 1000l); | |
2483 | } | |
2484 | ||
2485 | ||
2486 | static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp, | |
2487 | int *valp, | |
2488 | int write, void *data) | |
2489 | { | |
2490 | if (write) { | |
2491 | if (*lvalp > LONG_MAX / HZ) | |
2492 | return 1; | |
2493 | *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ); | |
2494 | } else { | |
2495 | int val = *valp; | |
2496 | unsigned long lval; | |
2497 | if (val < 0) { | |
2498 | *negp = -1; | |
2499 | lval = (unsigned long)-val; | |
2500 | } else { | |
2501 | *negp = 0; | |
2502 | lval = (unsigned long)val; | |
2503 | } | |
2504 | *lvalp = lval / HZ; | |
2505 | } | |
2506 | return 0; | |
2507 | } | |
2508 | ||
2509 | static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp, | |
2510 | int *valp, | |
2511 | int write, void *data) | |
2512 | { | |
2513 | if (write) { | |
2514 | if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ) | |
2515 | return 1; | |
2516 | *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp); | |
2517 | } else { | |
2518 | int val = *valp; | |
2519 | unsigned long lval; | |
2520 | if (val < 0) { | |
2521 | *negp = -1; | |
2522 | lval = (unsigned long)-val; | |
2523 | } else { | |
2524 | *negp = 0; | |
2525 | lval = (unsigned long)val; | |
2526 | } | |
2527 | *lvalp = jiffies_to_clock_t(lval); | |
2528 | } | |
2529 | return 0; | |
2530 | } | |
2531 | ||
2532 | static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp, | |
2533 | int *valp, | |
2534 | int write, void *data) | |
2535 | { | |
2536 | if (write) { | |
2537 | *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp); | |
2538 | } else { | |
2539 | int val = *valp; | |
2540 | unsigned long lval; | |
2541 | if (val < 0) { | |
2542 | *negp = -1; | |
2543 | lval = (unsigned long)-val; | |
2544 | } else { | |
2545 | *negp = 0; | |
2546 | lval = (unsigned long)val; | |
2547 | } | |
2548 | *lvalp = jiffies_to_msecs(lval); | |
2549 | } | |
2550 | return 0; | |
2551 | } | |
2552 | ||
2553 | /** | |
2554 | * proc_dointvec_jiffies - read a vector of integers as seconds | |
2555 | * @table: the sysctl table | |
2556 | * @write: %TRUE if this is a write to the sysctl file | |
2557 | * @filp: the file structure | |
2558 | * @buffer: the user buffer | |
2559 | * @lenp: the size of the user buffer | |
2560 | * @ppos: file position | |
2561 | * | |
2562 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer | |
2563 | * values from/to the user buffer, treated as an ASCII string. | |
2564 | * The values read are assumed to be in seconds, and are converted into | |
2565 | * jiffies. | |
2566 | * | |
2567 | * Returns 0 on success. | |
2568 | */ | |
2569 | int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp, | |
2570 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2571 | { | |
2572 | return do_proc_dointvec(table,write,filp,buffer,lenp,ppos, | |
2573 | do_proc_dointvec_jiffies_conv,NULL); | |
2574 | } | |
2575 | ||
2576 | /** | |
2577 | * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds | |
2578 | * @table: the sysctl table | |
2579 | * @write: %TRUE if this is a write to the sysctl file | |
2580 | * @filp: the file structure | |
2581 | * @buffer: the user buffer | |
2582 | * @lenp: the size of the user buffer | |
2583 | * @ppos: pointer to the file position | |
2584 | * | |
2585 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer | |
2586 | * values from/to the user buffer, treated as an ASCII string. | |
2587 | * The values read are assumed to be in 1/USER_HZ seconds, and | |
2588 | * are converted into jiffies. | |
2589 | * | |
2590 | * Returns 0 on success. | |
2591 | */ | |
2592 | int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp, | |
2593 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2594 | { | |
2595 | return do_proc_dointvec(table,write,filp,buffer,lenp,ppos, | |
2596 | do_proc_dointvec_userhz_jiffies_conv,NULL); | |
2597 | } | |
2598 | ||
2599 | /** | |
2600 | * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds | |
2601 | * @table: the sysctl table | |
2602 | * @write: %TRUE if this is a write to the sysctl file | |
2603 | * @filp: the file structure | |
2604 | * @buffer: the user buffer | |
2605 | * @lenp: the size of the user buffer | |
2606 | * @ppos: file position | |
2607 | * @ppos: the current position in the file | |
2608 | * | |
2609 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer | |
2610 | * values from/to the user buffer, treated as an ASCII string. | |
2611 | * The values read are assumed to be in 1/1000 seconds, and | |
2612 | * are converted into jiffies. | |
2613 | * | |
2614 | * Returns 0 on success. | |
2615 | */ | |
2616 | int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp, | |
2617 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2618 | { | |
2619 | return do_proc_dointvec(table, write, filp, buffer, lenp, ppos, | |
2620 | do_proc_dointvec_ms_jiffies_conv, NULL); | |
2621 | } | |
2622 | ||
2623 | static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp, | |
2624 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2625 | { | |
2626 | struct pid *new_pid; | |
2627 | pid_t tmp; | |
2628 | int r; | |
2629 | ||
2630 | tmp = pid_vnr(cad_pid); | |
2631 | ||
2632 | r = __do_proc_dointvec(&tmp, table, write, filp, buffer, | |
2633 | lenp, ppos, NULL, NULL); | |
2634 | if (r || !write) | |
2635 | return r; | |
2636 | ||
2637 | new_pid = find_get_pid(tmp); | |
2638 | if (!new_pid) | |
2639 | return -ESRCH; | |
2640 | ||
2641 | put_pid(xchg(&cad_pid, new_pid)); | |
2642 | return 0; | |
2643 | } | |
2644 | ||
2645 | #else /* CONFIG_PROC_FS */ | |
2646 | ||
2647 | int proc_dostring(struct ctl_table *table, int write, struct file *filp, | |
2648 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2649 | { | |
2650 | return -ENOSYS; | |
2651 | } | |
2652 | ||
2653 | int proc_dointvec(struct ctl_table *table, int write, struct file *filp, | |
2654 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2655 | { | |
2656 | return -ENOSYS; | |
2657 | } | |
2658 | ||
2659 | int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp, | |
2660 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2661 | { | |
2662 | return -ENOSYS; | |
2663 | } | |
2664 | ||
2665 | int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp, | |
2666 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2667 | { | |
2668 | return -ENOSYS; | |
2669 | } | |
2670 | ||
2671 | int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp, | |
2672 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2673 | { | |
2674 | return -ENOSYS; | |
2675 | } | |
2676 | ||
2677 | int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp, | |
2678 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2679 | { | |
2680 | return -ENOSYS; | |
2681 | } | |
2682 | ||
2683 | int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp, | |
2684 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2685 | { | |
2686 | return -ENOSYS; | |
2687 | } | |
2688 | ||
2689 | int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, | |
2690 | struct file *filp, | |
2691 | void __user *buffer, | |
2692 | size_t *lenp, loff_t *ppos) | |
2693 | { | |
2694 | return -ENOSYS; | |
2695 | } | |
2696 | ||
2697 | ||
2698 | #endif /* CONFIG_PROC_FS */ | |
2699 | ||
2700 | ||
2701 | #ifdef CONFIG_SYSCTL_SYSCALL | |
2702 | /* | |
2703 | * General sysctl support routines | |
2704 | */ | |
2705 | ||
2706 | /* The generic sysctl data routine (used if no strategy routine supplied) */ | |
2707 | int sysctl_data(struct ctl_table *table, | |
2708 | void __user *oldval, size_t __user *oldlenp, | |
2709 | void __user *newval, size_t newlen) | |
2710 | { | |
2711 | size_t len; | |
2712 | ||
2713 | /* Get out of I don't have a variable */ | |
2714 | if (!table->data || !table->maxlen) | |
2715 | return -ENOTDIR; | |
2716 | ||
2717 | if (oldval && oldlenp) { | |
2718 | if (get_user(len, oldlenp)) | |
2719 | return -EFAULT; | |
2720 | if (len) { | |
2721 | if (len > table->maxlen) | |
2722 | len = table->maxlen; | |
2723 | if (copy_to_user(oldval, table->data, len)) | |
2724 | return -EFAULT; | |
2725 | if (put_user(len, oldlenp)) | |
2726 | return -EFAULT; | |
2727 | } | |
2728 | } | |
2729 | ||
2730 | if (newval && newlen) { | |
2731 | if (newlen > table->maxlen) | |
2732 | newlen = table->maxlen; | |
2733 | ||
2734 | if (copy_from_user(table->data, newval, newlen)) | |
2735 | return -EFAULT; | |
2736 | } | |
2737 | return 1; | |
2738 | } | |
2739 | ||
2740 | /* The generic string strategy routine: */ | |
2741 | int sysctl_string(struct ctl_table *table, | |
2742 | void __user *oldval, size_t __user *oldlenp, | |
2743 | void __user *newval, size_t newlen) | |
2744 | { | |
2745 | if (!table->data || !table->maxlen) | |
2746 | return -ENOTDIR; | |
2747 | ||
2748 | if (oldval && oldlenp) { | |
2749 | size_t bufsize; | |
2750 | if (get_user(bufsize, oldlenp)) | |
2751 | return -EFAULT; | |
2752 | if (bufsize) { | |
2753 | size_t len = strlen(table->data), copied; | |
2754 | ||
2755 | /* This shouldn't trigger for a well-formed sysctl */ | |
2756 | if (len > table->maxlen) | |
2757 | len = table->maxlen; | |
2758 | ||
2759 | /* Copy up to a max of bufsize-1 bytes of the string */ | |
2760 | copied = (len >= bufsize) ? bufsize - 1 : len; | |
2761 | ||
2762 | if (copy_to_user(oldval, table->data, copied) || | |
2763 | put_user(0, (char __user *)(oldval + copied))) | |
2764 | return -EFAULT; | |
2765 | if (put_user(len, oldlenp)) | |
2766 | return -EFAULT; | |
2767 | } | |
2768 | } | |
2769 | if (newval && newlen) { | |
2770 | size_t len = newlen; | |
2771 | if (len > table->maxlen) | |
2772 | len = table->maxlen; | |
2773 | if(copy_from_user(table->data, newval, len)) | |
2774 | return -EFAULT; | |
2775 | if (len == table->maxlen) | |
2776 | len--; | |
2777 | ((char *) table->data)[len] = 0; | |
2778 | } | |
2779 | return 1; | |
2780 | } | |
2781 | ||
2782 | /* | |
2783 | * This function makes sure that all of the integers in the vector | |
2784 | * are between the minimum and maximum values given in the arrays | |
2785 | * table->extra1 and table->extra2, respectively. | |
2786 | */ | |
2787 | int sysctl_intvec(struct ctl_table *table, | |
2788 | void __user *oldval, size_t __user *oldlenp, | |
2789 | void __user *newval, size_t newlen) | |
2790 | { | |
2791 | ||
2792 | if (newval && newlen) { | |
2793 | int __user *vec = (int __user *) newval; | |
2794 | int *min = (int *) table->extra1; | |
2795 | int *max = (int *) table->extra2; | |
2796 | size_t length; | |
2797 | int i; | |
2798 | ||
2799 | if (newlen % sizeof(int) != 0) | |
2800 | return -EINVAL; | |
2801 | ||
2802 | if (!table->extra1 && !table->extra2) | |
2803 | return 0; | |
2804 | ||
2805 | if (newlen > table->maxlen) | |
2806 | newlen = table->maxlen; | |
2807 | length = newlen / sizeof(int); | |
2808 | ||
2809 | for (i = 0; i < length; i++) { | |
2810 | int value; | |
2811 | if (get_user(value, vec + i)) | |
2812 | return -EFAULT; | |
2813 | if (min && value < min[i]) | |
2814 | return -EINVAL; | |
2815 | if (max && value > max[i]) | |
2816 | return -EINVAL; | |
2817 | } | |
2818 | } | |
2819 | return 0; | |
2820 | } | |
2821 | ||
2822 | /* Strategy function to convert jiffies to seconds */ | |
2823 | int sysctl_jiffies(struct ctl_table *table, | |
2824 | void __user *oldval, size_t __user *oldlenp, | |
2825 | void __user *newval, size_t newlen) | |
2826 | { | |
2827 | if (oldval && oldlenp) { | |
2828 | size_t olen; | |
2829 | ||
2830 | if (get_user(olen, oldlenp)) | |
2831 | return -EFAULT; | |
2832 | if (olen) { | |
2833 | int val; | |
2834 | ||
2835 | if (olen < sizeof(int)) | |
2836 | return -EINVAL; | |
2837 | ||
2838 | val = *(int *)(table->data) / HZ; | |
2839 | if (put_user(val, (int __user *)oldval)) | |
2840 | return -EFAULT; | |
2841 | if (put_user(sizeof(int), oldlenp)) | |
2842 | return -EFAULT; | |
2843 | } | |
2844 | } | |
2845 | if (newval && newlen) { | |
2846 | int new; | |
2847 | if (newlen != sizeof(int)) | |
2848 | return -EINVAL; | |
2849 | if (get_user(new, (int __user *)newval)) | |
2850 | return -EFAULT; | |
2851 | *(int *)(table->data) = new*HZ; | |
2852 | } | |
2853 | return 1; | |
2854 | } | |
2855 | ||
2856 | /* Strategy function to convert jiffies to seconds */ | |
2857 | int sysctl_ms_jiffies(struct ctl_table *table, | |
2858 | void __user *oldval, size_t __user *oldlenp, | |
2859 | void __user *newval, size_t newlen) | |
2860 | { | |
2861 | if (oldval && oldlenp) { | |
2862 | size_t olen; | |
2863 | ||
2864 | if (get_user(olen, oldlenp)) | |
2865 | return -EFAULT; | |
2866 | if (olen) { | |
2867 | int val; | |
2868 | ||
2869 | if (olen < sizeof(int)) | |
2870 | return -EINVAL; | |
2871 | ||
2872 | val = jiffies_to_msecs(*(int *)(table->data)); | |
2873 | if (put_user(val, (int __user *)oldval)) | |
2874 | return -EFAULT; | |
2875 | if (put_user(sizeof(int), oldlenp)) | |
2876 | return -EFAULT; | |
2877 | } | |
2878 | } | |
2879 | if (newval && newlen) { | |
2880 | int new; | |
2881 | if (newlen != sizeof(int)) | |
2882 | return -EINVAL; | |
2883 | if (get_user(new, (int __user *)newval)) | |
2884 | return -EFAULT; | |
2885 | *(int *)(table->data) = msecs_to_jiffies(new); | |
2886 | } | |
2887 | return 1; | |
2888 | } | |
2889 | ||
2890 | ||
2891 | ||
2892 | #else /* CONFIG_SYSCTL_SYSCALL */ | |
2893 | ||
2894 | ||
2895 | asmlinkage long sys_sysctl(struct __sysctl_args __user *args) | |
2896 | { | |
2897 | struct __sysctl_args tmp; | |
2898 | int error; | |
2899 | ||
2900 | if (copy_from_user(&tmp, args, sizeof(tmp))) | |
2901 | return -EFAULT; | |
2902 | ||
2903 | error = deprecated_sysctl_warning(&tmp); | |
2904 | ||
2905 | /* If no error reading the parameters then just -ENOSYS ... */ | |
2906 | if (!error) | |
2907 | error = -ENOSYS; | |
2908 | ||
2909 | return error; | |
2910 | } | |
2911 | ||
2912 | int sysctl_data(struct ctl_table *table, | |
2913 | void __user *oldval, size_t __user *oldlenp, | |
2914 | void __user *newval, size_t newlen) | |
2915 | { | |
2916 | return -ENOSYS; | |
2917 | } | |
2918 | ||
2919 | int sysctl_string(struct ctl_table *table, | |
2920 | void __user *oldval, size_t __user *oldlenp, | |
2921 | void __user *newval, size_t newlen) | |
2922 | { | |
2923 | return -ENOSYS; | |
2924 | } | |
2925 | ||
2926 | int sysctl_intvec(struct ctl_table *table, | |
2927 | void __user *oldval, size_t __user *oldlenp, | |
2928 | void __user *newval, size_t newlen) | |
2929 | { | |
2930 | return -ENOSYS; | |
2931 | } | |
2932 | ||
2933 | int sysctl_jiffies(struct ctl_table *table, | |
2934 | void __user *oldval, size_t __user *oldlenp, | |
2935 | void __user *newval, size_t newlen) | |
2936 | { | |
2937 | return -ENOSYS; | |
2938 | } | |
2939 | ||
2940 | int sysctl_ms_jiffies(struct ctl_table *table, | |
2941 | void __user *oldval, size_t __user *oldlenp, | |
2942 | void __user *newval, size_t newlen) | |
2943 | { | |
2944 | return -ENOSYS; | |
2945 | } | |
2946 | ||
2947 | #endif /* CONFIG_SYSCTL_SYSCALL */ | |
2948 | ||
2949 | static int deprecated_sysctl_warning(struct __sysctl_args *args) | |
2950 | { | |
2951 | static int msg_count; | |
2952 | int name[CTL_MAXNAME]; | |
2953 | int i; | |
2954 | ||
2955 | /* Check args->nlen. */ | |
2956 | if (args->nlen < 0 || args->nlen > CTL_MAXNAME) | |
2957 | return -ENOTDIR; | |
2958 | ||
2959 | /* Read in the sysctl name for better debug message logging */ | |
2960 | for (i = 0; i < args->nlen; i++) | |
2961 | if (get_user(name[i], args->name + i)) | |
2962 | return -EFAULT; | |
2963 | ||
2964 | /* Ignore accesses to kernel.version */ | |
2965 | if ((args->nlen == 2) && (name[0] == CTL_KERN) && (name[1] == KERN_VERSION)) | |
2966 | return 0; | |
2967 | ||
2968 | if (msg_count < 5) { | |
2969 | msg_count++; | |
2970 | printk(KERN_INFO | |
2971 | "warning: process `%s' used the deprecated sysctl " | |
2972 | "system call with ", current->comm); | |
2973 | for (i = 0; i < args->nlen; i++) | |
2974 | printk("%d.", name[i]); | |
2975 | printk("\n"); | |
2976 | } | |
2977 | return 0; | |
2978 | } | |
2979 | ||
2980 | /* | |
2981 | * No sense putting this after each symbol definition, twice, | |
2982 | * exception granted :-) | |
2983 | */ | |
2984 | EXPORT_SYMBOL(proc_dointvec); | |
2985 | EXPORT_SYMBOL(proc_dointvec_jiffies); | |
2986 | EXPORT_SYMBOL(proc_dointvec_minmax); | |
2987 | EXPORT_SYMBOL(proc_dointvec_userhz_jiffies); | |
2988 | EXPORT_SYMBOL(proc_dointvec_ms_jiffies); | |
2989 | EXPORT_SYMBOL(proc_dostring); | |
2990 | EXPORT_SYMBOL(proc_doulongvec_minmax); | |
2991 | EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax); | |
2992 | EXPORT_SYMBOL(register_sysctl_table); | |
2993 | EXPORT_SYMBOL(register_sysctl_paths); | |
2994 | EXPORT_SYMBOL(sysctl_intvec); | |
2995 | EXPORT_SYMBOL(sysctl_jiffies); | |
2996 | EXPORT_SYMBOL(sysctl_ms_jiffies); | |
2997 | EXPORT_SYMBOL(sysctl_string); | |
2998 | EXPORT_SYMBOL(sysctl_data); | |
2999 | EXPORT_SYMBOL(unregister_sysctl_table); |