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Commit | Line | Data |
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1da177e4 LT |
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 | ||
1da177e4 LT |
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> | |
72c2d582 | 27 | #include <linux/security.h> |
1da177e4 | 28 | #include <linux/ctype.h> |
dfec072e | 29 | #include <linux/kmemcheck.h> |
62239ac2 | 30 | #include <linux/fs.h> |
1da177e4 LT |
31 | #include <linux/init.h> |
32 | #include <linux/kernel.h> | |
0296b228 | 33 | #include <linux/kobject.h> |
20380731 | 34 | #include <linux/net.h> |
1da177e4 LT |
35 | #include <linux/sysrq.h> |
36 | #include <linux/highuid.h> | |
37 | #include <linux/writeback.h> | |
3fff4c42 | 38 | #include <linux/ratelimit.h> |
1da177e4 | 39 | #include <linux/hugetlb.h> |
1da177e4 | 40 | #include <linux/initrd.h> |
0b77f5bf | 41 | #include <linux/key.h> |
1da177e4 LT |
42 | #include <linux/times.h> |
43 | #include <linux/limits.h> | |
44 | #include <linux/dcache.h> | |
45 | #include <linux/syscalls.h> | |
c748e134 | 46 | #include <linux/vmstat.h> |
c255d844 PM |
47 | #include <linux/nfs_fs.h> |
48 | #include <linux/acpi.h> | |
10a0a8d4 | 49 | #include <linux/reboot.h> |
b0fc494f | 50 | #include <linux/ftrace.h> |
12e22c5e | 51 | #include <linux/slow-work.h> |
cdd6c482 | 52 | #include <linux/perf_event.h> |
1da177e4 LT |
53 | |
54 | #include <asm/uaccess.h> | |
55 | #include <asm/processor.h> | |
56 | ||
29cbc78b AK |
57 | #ifdef CONFIG_X86 |
58 | #include <asm/nmi.h> | |
0741f4d2 | 59 | #include <asm/stacktrace.h> |
6e7c4025 | 60 | #include <asm/io.h> |
29cbc78b AK |
61 | #endif |
62 | ||
7058cb02 | 63 | |
1da177e4 LT |
64 | #if defined(CONFIG_SYSCTL) |
65 | ||
66 | /* External variables not in a header file. */ | |
67 | extern int C_A_D; | |
45807a1d | 68 | extern int print_fatal_signals; |
1da177e4 LT |
69 | extern int sysctl_overcommit_memory; |
70 | extern int sysctl_overcommit_ratio; | |
fadd8fbd | 71 | extern int sysctl_panic_on_oom; |
fe071d7e | 72 | extern int sysctl_oom_kill_allocating_task; |
fef1bdd6 | 73 | extern int sysctl_oom_dump_tasks; |
1da177e4 | 74 | extern int max_threads; |
1da177e4 | 75 | extern int core_uses_pid; |
d6e71144 | 76 | extern int suid_dumpable; |
1da177e4 | 77 | extern char core_pattern[]; |
a293980c | 78 | extern unsigned int core_pipe_limit; |
1da177e4 LT |
79 | extern int pid_max; |
80 | extern int min_free_kbytes; | |
1da177e4 | 81 | extern int pid_max_min, pid_max_max; |
9d0243bc | 82 | extern int sysctl_drop_caches; |
8ad4b1fb | 83 | extern int percpu_pagelist_fraction; |
bebfa101 | 84 | extern int compat_log; |
9745512c | 85 | extern int latencytop_enabled; |
eceea0b3 | 86 | extern int sysctl_nr_open_min, sysctl_nr_open_max; |
dd8632a1 PM |
87 | #ifndef CONFIG_MMU |
88 | extern int sysctl_nr_trim_pages; | |
89 | #endif | |
31a72bce PM |
90 | #ifdef CONFIG_RCU_TORTURE_TEST |
91 | extern int rcutorture_runnable; | |
92 | #endif /* #ifdef CONFIG_RCU_TORTURE_TEST */ | |
cb684b5b | 93 | #ifdef CONFIG_BLOCK |
5e605b64 | 94 | extern int blk_iopoll_enabled; |
cb684b5b | 95 | #endif |
1da177e4 | 96 | |
c4f3b63f | 97 | /* Constants used for minimum and maximum */ |
195cf453 | 98 | #ifdef CONFIG_DETECT_SOFTLOCKUP |
c4f3b63f | 99 | static int sixty = 60; |
9383d967 | 100 | static int neg_one = -1; |
c4f3b63f RT |
101 | #endif |
102 | ||
c4f3b63f | 103 | static int zero; |
cd5f9a4c LT |
104 | static int __maybe_unused one = 1; |
105 | static int __maybe_unused two = 2; | |
fc3501d4 | 106 | static unsigned long one_ul = 1; |
c4f3b63f | 107 | static int one_hundred = 100; |
af91322e DY |
108 | #ifdef CONFIG_PRINTK |
109 | static int ten_thousand = 10000; | |
110 | #endif | |
c4f3b63f | 111 | |
9e4a5bda AR |
112 | /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */ |
113 | static unsigned long dirty_bytes_min = 2 * PAGE_SIZE; | |
114 | ||
1da177e4 LT |
115 | /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */ |
116 | static int maxolduid = 65535; | |
117 | static int minolduid; | |
8ad4b1fb | 118 | static int min_percpu_pagelist_fract = 8; |
1da177e4 LT |
119 | |
120 | static int ngroups_max = NGROUPS_MAX; | |
121 | ||
a1ef5adb | 122 | #ifdef CONFIG_MODULES |
1da177e4 | 123 | extern char modprobe_path[]; |
3d43321b | 124 | extern int modules_disabled; |
1da177e4 | 125 | #endif |
1da177e4 LT |
126 | #ifdef CONFIG_CHR_DEV_SG |
127 | extern int sg_big_buff; | |
128 | #endif | |
1da177e4 | 129 | |
72c57ed5 | 130 | #ifdef CONFIG_SPARC |
17f04fbb | 131 | #include <asm/system.h> |
1da177e4 LT |
132 | #endif |
133 | ||
0871420f DM |
134 | #ifdef CONFIG_SPARC64 |
135 | extern int sysctl_tsb_ratio; | |
136 | #endif | |
137 | ||
1da177e4 LT |
138 | #ifdef __hppa__ |
139 | extern int pwrsw_enabled; | |
140 | extern int unaligned_enabled; | |
141 | #endif | |
142 | ||
347a8dc3 | 143 | #ifdef CONFIG_S390 |
1da177e4 LT |
144 | #ifdef CONFIG_MATHEMU |
145 | extern int sysctl_ieee_emulation_warnings; | |
146 | #endif | |
147 | extern int sysctl_userprocess_debug; | |
951f22d5 | 148 | extern int spin_retry; |
1da177e4 LT |
149 | #endif |
150 | ||
1da177e4 LT |
151 | #ifdef CONFIG_BSD_PROCESS_ACCT |
152 | extern int acct_parm[]; | |
153 | #endif | |
154 | ||
d2b176ed JS |
155 | #ifdef CONFIG_IA64 |
156 | extern int no_unaligned_warning; | |
88fc241f | 157 | extern int unaligned_dump_stack; |
d2b176ed JS |
158 | #endif |
159 | ||
3fff4c42 IM |
160 | extern struct ratelimit_state printk_ratelimit_state; |
161 | ||
23f78d4a IM |
162 | #ifdef CONFIG_RT_MUTEXES |
163 | extern int max_lock_depth; | |
164 | #endif | |
165 | ||
d6f8ff73 | 166 | #ifdef CONFIG_PROC_SYSCTL |
8d65af78 | 167 | static int proc_do_cad_pid(struct ctl_table *table, int write, |
9ec52099 | 168 | void __user *buffer, size_t *lenp, loff_t *ppos); |
8d65af78 | 169 | static int proc_taint(struct ctl_table *table, int write, |
34f5a398 | 170 | void __user *buffer, size_t *lenp, loff_t *ppos); |
d6f8ff73 | 171 | #endif |
9ec52099 | 172 | |
d8217f07 | 173 | static struct ctl_table root_table[]; |
e51b6ba0 EB |
174 | static struct ctl_table_root sysctl_table_root; |
175 | static struct ctl_table_header root_table_header = { | |
b380b0d4 | 176 | .count = 1, |
e51b6ba0 | 177 | .ctl_table = root_table, |
73455092 | 178 | .ctl_entry = LIST_HEAD_INIT(sysctl_table_root.default_set.list), |
e51b6ba0 | 179 | .root = &sysctl_table_root, |
73455092 | 180 | .set = &sysctl_table_root.default_set, |
e51b6ba0 EB |
181 | }; |
182 | static struct ctl_table_root sysctl_table_root = { | |
183 | .root_list = LIST_HEAD_INIT(sysctl_table_root.root_list), | |
73455092 | 184 | .default_set.list = LIST_HEAD_INIT(root_table_header.ctl_entry), |
e51b6ba0 | 185 | }; |
1da177e4 | 186 | |
d8217f07 EB |
187 | static struct ctl_table kern_table[]; |
188 | static struct ctl_table vm_table[]; | |
189 | static struct ctl_table fs_table[]; | |
190 | static struct ctl_table debug_table[]; | |
191 | static struct ctl_table dev_table[]; | |
192 | extern struct ctl_table random_table[]; | |
2d9048e2 | 193 | #ifdef CONFIG_INOTIFY_USER |
d8217f07 | 194 | extern struct ctl_table inotify_table[]; |
0399cb08 | 195 | #endif |
7ef9964e DL |
196 | #ifdef CONFIG_EPOLL |
197 | extern struct ctl_table epoll_table[]; | |
198 | #endif | |
1da177e4 LT |
199 | |
200 | #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT | |
201 | int sysctl_legacy_va_layout; | |
202 | #endif | |
203 | ||
f20786ff PZ |
204 | extern int prove_locking; |
205 | extern int lock_stat; | |
9bc9a6bd | 206 | |
1da177e4 LT |
207 | /* The default sysctl tables: */ |
208 | ||
d8217f07 | 209 | static struct ctl_table root_table[] = { |
1da177e4 | 210 | { |
1da177e4 LT |
211 | .procname = "kernel", |
212 | .mode = 0555, | |
213 | .child = kern_table, | |
214 | }, | |
215 | { | |
1da177e4 LT |
216 | .procname = "vm", |
217 | .mode = 0555, | |
218 | .child = vm_table, | |
219 | }, | |
1da177e4 | 220 | { |
1da177e4 LT |
221 | .procname = "fs", |
222 | .mode = 0555, | |
223 | .child = fs_table, | |
224 | }, | |
225 | { | |
1da177e4 LT |
226 | .procname = "debug", |
227 | .mode = 0555, | |
228 | .child = debug_table, | |
229 | }, | |
230 | { | |
1da177e4 LT |
231 | .procname = "dev", |
232 | .mode = 0555, | |
233 | .child = dev_table, | |
234 | }, | |
2be7fe07 AM |
235 | /* |
236 | * NOTE: do not add new entries to this table unless you have read | |
237 | * Documentation/sysctl/ctl_unnumbered.txt | |
238 | */ | |
6fce56ec | 239 | { } |
1da177e4 LT |
240 | }; |
241 | ||
77e54a1f | 242 | #ifdef CONFIG_SCHED_DEBUG |
73c4efd2 ED |
243 | static int min_sched_granularity_ns = 100000; /* 100 usecs */ |
244 | static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */ | |
245 | static int min_wakeup_granularity_ns; /* 0 usecs */ | |
246 | static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */ | |
77e54a1f IM |
247 | #endif |
248 | ||
d8217f07 | 249 | static struct ctl_table kern_table[] = { |
2bba22c5 | 250 | { |
2bba22c5 MG |
251 | .procname = "sched_child_runs_first", |
252 | .data = &sysctl_sched_child_runs_first, | |
253 | .maxlen = sizeof(unsigned int), | |
254 | .mode = 0644, | |
6d456111 | 255 | .proc_handler = proc_dointvec, |
2bba22c5 | 256 | }, |
77e54a1f IM |
257 | #ifdef CONFIG_SCHED_DEBUG |
258 | { | |
b2be5e96 PZ |
259 | .procname = "sched_min_granularity_ns", |
260 | .data = &sysctl_sched_min_granularity, | |
77e54a1f IM |
261 | .maxlen = sizeof(unsigned int), |
262 | .mode = 0644, | |
6d456111 | 263 | .proc_handler = sched_nr_latency_handler, |
b2be5e96 PZ |
264 | .extra1 = &min_sched_granularity_ns, |
265 | .extra2 = &max_sched_granularity_ns, | |
77e54a1f | 266 | }, |
21805085 | 267 | { |
21805085 PZ |
268 | .procname = "sched_latency_ns", |
269 | .data = &sysctl_sched_latency, | |
270 | .maxlen = sizeof(unsigned int), | |
271 | .mode = 0644, | |
6d456111 | 272 | .proc_handler = sched_nr_latency_handler, |
21805085 PZ |
273 | .extra1 = &min_sched_granularity_ns, |
274 | .extra2 = &max_sched_granularity_ns, | |
275 | }, | |
77e54a1f | 276 | { |
77e54a1f IM |
277 | .procname = "sched_wakeup_granularity_ns", |
278 | .data = &sysctl_sched_wakeup_granularity, | |
279 | .maxlen = sizeof(unsigned int), | |
280 | .mode = 0644, | |
6d456111 | 281 | .proc_handler = proc_dointvec_minmax, |
77e54a1f IM |
282 | .extra1 = &min_wakeup_granularity_ns, |
283 | .extra2 = &max_wakeup_granularity_ns, | |
284 | }, | |
2398f2c6 | 285 | { |
2398f2c6 PZ |
286 | .procname = "sched_shares_ratelimit", |
287 | .data = &sysctl_sched_shares_ratelimit, | |
288 | .maxlen = sizeof(unsigned int), | |
289 | .mode = 0644, | |
6d456111 | 290 | .proc_handler = proc_dointvec, |
2398f2c6 | 291 | }, |
ffda12a1 | 292 | { |
ffda12a1 PZ |
293 | .procname = "sched_shares_thresh", |
294 | .data = &sysctl_sched_shares_thresh, | |
295 | .maxlen = sizeof(unsigned int), | |
296 | .mode = 0644, | |
6d456111 | 297 | .proc_handler = proc_dointvec_minmax, |
ffda12a1 PZ |
298 | .extra1 = &zero, |
299 | }, | |
1fc84aaa | 300 | { |
1fc84aaa PZ |
301 | .procname = "sched_features", |
302 | .data = &sysctl_sched_features, | |
303 | .maxlen = sizeof(unsigned int), | |
304 | .mode = 0644, | |
6d456111 | 305 | .proc_handler = proc_dointvec, |
1fc84aaa | 306 | }, |
da84d961 | 307 | { |
da84d961 IM |
308 | .procname = "sched_migration_cost", |
309 | .data = &sysctl_sched_migration_cost, | |
310 | .maxlen = sizeof(unsigned int), | |
311 | .mode = 0644, | |
6d456111 | 312 | .proc_handler = proc_dointvec, |
da84d961 | 313 | }, |
b82d9fdd | 314 | { |
b82d9fdd PZ |
315 | .procname = "sched_nr_migrate", |
316 | .data = &sysctl_sched_nr_migrate, | |
317 | .maxlen = sizeof(unsigned int), | |
fa85ae24 | 318 | .mode = 0644, |
6d456111 | 319 | .proc_handler = proc_dointvec, |
fa85ae24 | 320 | }, |
e9e9250b | 321 | { |
e9e9250b PZ |
322 | .procname = "sched_time_avg", |
323 | .data = &sysctl_sched_time_avg, | |
324 | .maxlen = sizeof(unsigned int), | |
325 | .mode = 0644, | |
6d456111 | 326 | .proc_handler = proc_dointvec, |
e9e9250b | 327 | }, |
cd1bb94b | 328 | { |
cd1bb94b AB |
329 | .procname = "timer_migration", |
330 | .data = &sysctl_timer_migration, | |
331 | .maxlen = sizeof(unsigned int), | |
332 | .mode = 0644, | |
6d456111 | 333 | .proc_handler = proc_dointvec_minmax, |
bfdb4d9f AB |
334 | .extra1 = &zero, |
335 | .extra2 = &one, | |
fa85ae24 | 336 | }, |
1fc84aaa | 337 | #endif |
9f0c1e56 | 338 | { |
9f0c1e56 PZ |
339 | .procname = "sched_rt_period_us", |
340 | .data = &sysctl_sched_rt_period, | |
341 | .maxlen = sizeof(unsigned int), | |
342 | .mode = 0644, | |
6d456111 | 343 | .proc_handler = sched_rt_handler, |
9f0c1e56 PZ |
344 | }, |
345 | { | |
9f0c1e56 PZ |
346 | .procname = "sched_rt_runtime_us", |
347 | .data = &sysctl_sched_rt_runtime, | |
348 | .maxlen = sizeof(int), | |
349 | .mode = 0644, | |
6d456111 | 350 | .proc_handler = sched_rt_handler, |
9f0c1e56 | 351 | }, |
1799e35d | 352 | { |
1799e35d IM |
353 | .procname = "sched_compat_yield", |
354 | .data = &sysctl_sched_compat_yield, | |
355 | .maxlen = sizeof(unsigned int), | |
356 | .mode = 0644, | |
6d456111 | 357 | .proc_handler = proc_dointvec, |
1799e35d | 358 | }, |
f20786ff PZ |
359 | #ifdef CONFIG_PROVE_LOCKING |
360 | { | |
f20786ff PZ |
361 | .procname = "prove_locking", |
362 | .data = &prove_locking, | |
363 | .maxlen = sizeof(int), | |
364 | .mode = 0644, | |
6d456111 | 365 | .proc_handler = proc_dointvec, |
f20786ff PZ |
366 | }, |
367 | #endif | |
368 | #ifdef CONFIG_LOCK_STAT | |
369 | { | |
f20786ff PZ |
370 | .procname = "lock_stat", |
371 | .data = &lock_stat, | |
372 | .maxlen = sizeof(int), | |
373 | .mode = 0644, | |
6d456111 | 374 | .proc_handler = proc_dointvec, |
f20786ff | 375 | }, |
77e54a1f | 376 | #endif |
1da177e4 | 377 | { |
1da177e4 LT |
378 | .procname = "panic", |
379 | .data = &panic_timeout, | |
380 | .maxlen = sizeof(int), | |
381 | .mode = 0644, | |
6d456111 | 382 | .proc_handler = proc_dointvec, |
1da177e4 LT |
383 | }, |
384 | { | |
1da177e4 LT |
385 | .procname = "core_uses_pid", |
386 | .data = &core_uses_pid, | |
387 | .maxlen = sizeof(int), | |
388 | .mode = 0644, | |
6d456111 | 389 | .proc_handler = proc_dointvec, |
1da177e4 LT |
390 | }, |
391 | { | |
1da177e4 LT |
392 | .procname = "core_pattern", |
393 | .data = core_pattern, | |
71ce92f3 | 394 | .maxlen = CORENAME_MAX_SIZE, |
1da177e4 | 395 | .mode = 0644, |
6d456111 | 396 | .proc_handler = proc_dostring, |
1da177e4 | 397 | }, |
a293980c | 398 | { |
a293980c NH |
399 | .procname = "core_pipe_limit", |
400 | .data = &core_pipe_limit, | |
401 | .maxlen = sizeof(unsigned int), | |
402 | .mode = 0644, | |
6d456111 | 403 | .proc_handler = proc_dointvec, |
a293980c | 404 | }, |
34f5a398 | 405 | #ifdef CONFIG_PROC_SYSCTL |
1da177e4 | 406 | { |
1da177e4 | 407 | .procname = "tainted", |
25ddbb18 | 408 | .maxlen = sizeof(long), |
34f5a398 | 409 | .mode = 0644, |
6d456111 | 410 | .proc_handler = proc_taint, |
1da177e4 | 411 | }, |
34f5a398 | 412 | #endif |
9745512c AV |
413 | #ifdef CONFIG_LATENCYTOP |
414 | { | |
415 | .procname = "latencytop", | |
416 | .data = &latencytop_enabled, | |
417 | .maxlen = sizeof(int), | |
418 | .mode = 0644, | |
6d456111 | 419 | .proc_handler = proc_dointvec, |
9745512c AV |
420 | }, |
421 | #endif | |
1da177e4 LT |
422 | #ifdef CONFIG_BLK_DEV_INITRD |
423 | { | |
1da177e4 LT |
424 | .procname = "real-root-dev", |
425 | .data = &real_root_dev, | |
426 | .maxlen = sizeof(int), | |
427 | .mode = 0644, | |
6d456111 | 428 | .proc_handler = proc_dointvec, |
1da177e4 LT |
429 | }, |
430 | #endif | |
45807a1d | 431 | { |
45807a1d IM |
432 | .procname = "print-fatal-signals", |
433 | .data = &print_fatal_signals, | |
434 | .maxlen = sizeof(int), | |
435 | .mode = 0644, | |
6d456111 | 436 | .proc_handler = proc_dointvec, |
45807a1d | 437 | }, |
72c57ed5 | 438 | #ifdef CONFIG_SPARC |
1da177e4 | 439 | { |
1da177e4 LT |
440 | .procname = "reboot-cmd", |
441 | .data = reboot_command, | |
442 | .maxlen = 256, | |
443 | .mode = 0644, | |
6d456111 | 444 | .proc_handler = proc_dostring, |
1da177e4 LT |
445 | }, |
446 | { | |
1da177e4 LT |
447 | .procname = "stop-a", |
448 | .data = &stop_a_enabled, | |
449 | .maxlen = sizeof (int), | |
450 | .mode = 0644, | |
6d456111 | 451 | .proc_handler = proc_dointvec, |
1da177e4 LT |
452 | }, |
453 | { | |
1da177e4 LT |
454 | .procname = "scons-poweroff", |
455 | .data = &scons_pwroff, | |
456 | .maxlen = sizeof (int), | |
457 | .mode = 0644, | |
6d456111 | 458 | .proc_handler = proc_dointvec, |
1da177e4 LT |
459 | }, |
460 | #endif | |
0871420f DM |
461 | #ifdef CONFIG_SPARC64 |
462 | { | |
0871420f DM |
463 | .procname = "tsb-ratio", |
464 | .data = &sysctl_tsb_ratio, | |
465 | .maxlen = sizeof (int), | |
466 | .mode = 0644, | |
6d456111 | 467 | .proc_handler = proc_dointvec, |
0871420f DM |
468 | }, |
469 | #endif | |
1da177e4 LT |
470 | #ifdef __hppa__ |
471 | { | |
1da177e4 LT |
472 | .procname = "soft-power", |
473 | .data = &pwrsw_enabled, | |
474 | .maxlen = sizeof (int), | |
475 | .mode = 0644, | |
6d456111 | 476 | .proc_handler = proc_dointvec, |
1da177e4 LT |
477 | }, |
478 | { | |
1da177e4 LT |
479 | .procname = "unaligned-trap", |
480 | .data = &unaligned_enabled, | |
481 | .maxlen = sizeof (int), | |
482 | .mode = 0644, | |
6d456111 | 483 | .proc_handler = proc_dointvec, |
1da177e4 LT |
484 | }, |
485 | #endif | |
486 | { | |
1da177e4 LT |
487 | .procname = "ctrl-alt-del", |
488 | .data = &C_A_D, | |
489 | .maxlen = sizeof(int), | |
490 | .mode = 0644, | |
6d456111 | 491 | .proc_handler = proc_dointvec, |
1da177e4 | 492 | }, |
606576ce | 493 | #ifdef CONFIG_FUNCTION_TRACER |
b0fc494f | 494 | { |
b0fc494f SR |
495 | .procname = "ftrace_enabled", |
496 | .data = &ftrace_enabled, | |
497 | .maxlen = sizeof(int), | |
498 | .mode = 0644, | |
6d456111 | 499 | .proc_handler = ftrace_enable_sysctl, |
b0fc494f SR |
500 | }, |
501 | #endif | |
f38f1d2a SR |
502 | #ifdef CONFIG_STACK_TRACER |
503 | { | |
f38f1d2a SR |
504 | .procname = "stack_tracer_enabled", |
505 | .data = &stack_tracer_enabled, | |
506 | .maxlen = sizeof(int), | |
507 | .mode = 0644, | |
6d456111 | 508 | .proc_handler = stack_trace_sysctl, |
f38f1d2a SR |
509 | }, |
510 | #endif | |
944ac425 SR |
511 | #ifdef CONFIG_TRACING |
512 | { | |
3299b4dd | 513 | .procname = "ftrace_dump_on_oops", |
944ac425 SR |
514 | .data = &ftrace_dump_on_oops, |
515 | .maxlen = sizeof(int), | |
516 | .mode = 0644, | |
6d456111 | 517 | .proc_handler = proc_dointvec, |
944ac425 SR |
518 | }, |
519 | #endif | |
a1ef5adb | 520 | #ifdef CONFIG_MODULES |
1da177e4 | 521 | { |
1da177e4 LT |
522 | .procname = "modprobe", |
523 | .data = &modprobe_path, | |
524 | .maxlen = KMOD_PATH_LEN, | |
525 | .mode = 0644, | |
6d456111 | 526 | .proc_handler = proc_dostring, |
1da177e4 | 527 | }, |
3d43321b | 528 | { |
3d43321b KC |
529 | .procname = "modules_disabled", |
530 | .data = &modules_disabled, | |
531 | .maxlen = sizeof(int), | |
532 | .mode = 0644, | |
533 | /* only handle a transition from default "0" to "1" */ | |
6d456111 | 534 | .proc_handler = proc_dointvec_minmax, |
3d43321b KC |
535 | .extra1 = &one, |
536 | .extra2 = &one, | |
537 | }, | |
1da177e4 | 538 | #endif |
57ae2508 | 539 | #if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET) |
1da177e4 | 540 | { |
1da177e4 | 541 | .procname = "hotplug", |
312c004d KS |
542 | .data = &uevent_helper, |
543 | .maxlen = UEVENT_HELPER_PATH_LEN, | |
1da177e4 | 544 | .mode = 0644, |
6d456111 | 545 | .proc_handler = proc_dostring, |
1da177e4 LT |
546 | }, |
547 | #endif | |
548 | #ifdef CONFIG_CHR_DEV_SG | |
549 | { | |
1da177e4 LT |
550 | .procname = "sg-big-buff", |
551 | .data = &sg_big_buff, | |
552 | .maxlen = sizeof (int), | |
553 | .mode = 0444, | |
6d456111 | 554 | .proc_handler = proc_dointvec, |
1da177e4 LT |
555 | }, |
556 | #endif | |
557 | #ifdef CONFIG_BSD_PROCESS_ACCT | |
558 | { | |
1da177e4 LT |
559 | .procname = "acct", |
560 | .data = &acct_parm, | |
561 | .maxlen = 3*sizeof(int), | |
562 | .mode = 0644, | |
6d456111 | 563 | .proc_handler = proc_dointvec, |
1da177e4 LT |
564 | }, |
565 | #endif | |
1da177e4 LT |
566 | #ifdef CONFIG_MAGIC_SYSRQ |
567 | { | |
1da177e4 | 568 | .procname = "sysrq", |
5d6f647f | 569 | .data = &__sysrq_enabled, |
1da177e4 LT |
570 | .maxlen = sizeof (int), |
571 | .mode = 0644, | |
6d456111 | 572 | .proc_handler = proc_dointvec, |
1da177e4 LT |
573 | }, |
574 | #endif | |
d6f8ff73 | 575 | #ifdef CONFIG_PROC_SYSCTL |
1da177e4 | 576 | { |
1da177e4 | 577 | .procname = "cad_pid", |
9ec52099 | 578 | .data = NULL, |
1da177e4 LT |
579 | .maxlen = sizeof (int), |
580 | .mode = 0600, | |
6d456111 | 581 | .proc_handler = proc_do_cad_pid, |
1da177e4 | 582 | }, |
d6f8ff73 | 583 | #endif |
1da177e4 | 584 | { |
1da177e4 LT |
585 | .procname = "threads-max", |
586 | .data = &max_threads, | |
587 | .maxlen = sizeof(int), | |
588 | .mode = 0644, | |
6d456111 | 589 | .proc_handler = proc_dointvec, |
1da177e4 LT |
590 | }, |
591 | { | |
1da177e4 LT |
592 | .procname = "random", |
593 | .mode = 0555, | |
594 | .child = random_table, | |
595 | }, | |
1da177e4 | 596 | { |
1da177e4 LT |
597 | .procname = "overflowuid", |
598 | .data = &overflowuid, | |
599 | .maxlen = sizeof(int), | |
600 | .mode = 0644, | |
6d456111 | 601 | .proc_handler = proc_dointvec_minmax, |
1da177e4 LT |
602 | .extra1 = &minolduid, |
603 | .extra2 = &maxolduid, | |
604 | }, | |
605 | { | |
1da177e4 LT |
606 | .procname = "overflowgid", |
607 | .data = &overflowgid, | |
608 | .maxlen = sizeof(int), | |
609 | .mode = 0644, | |
6d456111 | 610 | .proc_handler = proc_dointvec_minmax, |
1da177e4 LT |
611 | .extra1 = &minolduid, |
612 | .extra2 = &maxolduid, | |
613 | }, | |
347a8dc3 | 614 | #ifdef CONFIG_S390 |
1da177e4 LT |
615 | #ifdef CONFIG_MATHEMU |
616 | { | |
1da177e4 LT |
617 | .procname = "ieee_emulation_warnings", |
618 | .data = &sysctl_ieee_emulation_warnings, | |
619 | .maxlen = sizeof(int), | |
620 | .mode = 0644, | |
6d456111 | 621 | .proc_handler = proc_dointvec, |
1da177e4 | 622 | }, |
1da177e4 LT |
623 | #endif |
624 | { | |
1da177e4 LT |
625 | .procname = "userprocess_debug", |
626 | .data = &sysctl_userprocess_debug, | |
627 | .maxlen = sizeof(int), | |
628 | .mode = 0644, | |
6d456111 | 629 | .proc_handler = proc_dointvec, |
1da177e4 LT |
630 | }, |
631 | #endif | |
632 | { | |
1da177e4 LT |
633 | .procname = "pid_max", |
634 | .data = &pid_max, | |
635 | .maxlen = sizeof (int), | |
636 | .mode = 0644, | |
6d456111 | 637 | .proc_handler = proc_dointvec_minmax, |
1da177e4 LT |
638 | .extra1 = &pid_max_min, |
639 | .extra2 = &pid_max_max, | |
640 | }, | |
641 | { | |
1da177e4 LT |
642 | .procname = "panic_on_oops", |
643 | .data = &panic_on_oops, | |
644 | .maxlen = sizeof(int), | |
645 | .mode = 0644, | |
6d456111 | 646 | .proc_handler = proc_dointvec, |
1da177e4 | 647 | }, |
7ef3d2fd JP |
648 | #if defined CONFIG_PRINTK |
649 | { | |
7ef3d2fd JP |
650 | .procname = "printk", |
651 | .data = &console_loglevel, | |
652 | .maxlen = 4*sizeof(int), | |
653 | .mode = 0644, | |
6d456111 | 654 | .proc_handler = proc_dointvec, |
7ef3d2fd | 655 | }, |
1da177e4 | 656 | { |
1da177e4 | 657 | .procname = "printk_ratelimit", |
717115e1 | 658 | .data = &printk_ratelimit_state.interval, |
1da177e4 LT |
659 | .maxlen = sizeof(int), |
660 | .mode = 0644, | |
6d456111 | 661 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
662 | }, |
663 | { | |
1da177e4 | 664 | .procname = "printk_ratelimit_burst", |
717115e1 | 665 | .data = &printk_ratelimit_state.burst, |
1da177e4 LT |
666 | .maxlen = sizeof(int), |
667 | .mode = 0644, | |
6d456111 | 668 | .proc_handler = proc_dointvec, |
1da177e4 | 669 | }, |
af91322e | 670 | { |
af91322e DY |
671 | .procname = "printk_delay", |
672 | .data = &printk_delay_msec, | |
673 | .maxlen = sizeof(int), | |
674 | .mode = 0644, | |
6d456111 | 675 | .proc_handler = proc_dointvec_minmax, |
af91322e DY |
676 | .extra1 = &zero, |
677 | .extra2 = &ten_thousand, | |
678 | }, | |
7ef3d2fd | 679 | #endif |
1da177e4 | 680 | { |
1da177e4 LT |
681 | .procname = "ngroups_max", |
682 | .data = &ngroups_max, | |
683 | .maxlen = sizeof (int), | |
684 | .mode = 0444, | |
6d456111 | 685 | .proc_handler = proc_dointvec, |
1da177e4 LT |
686 | }, |
687 | #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86) | |
688 | { | |
1da177e4 LT |
689 | .procname = "unknown_nmi_panic", |
690 | .data = &unknown_nmi_panic, | |
691 | .maxlen = sizeof (int), | |
692 | .mode = 0644, | |
6d456111 | 693 | .proc_handler = proc_dointvec, |
1da177e4 | 694 | }, |
407984f1 | 695 | { |
407984f1 DZ |
696 | .procname = "nmi_watchdog", |
697 | .data = &nmi_watchdog_enabled, | |
698 | .maxlen = sizeof (int), | |
699 | .mode = 0644, | |
6d456111 | 700 | .proc_handler = proc_nmi_enabled, |
1da177e4 LT |
701 | }, |
702 | #endif | |
703 | #if defined(CONFIG_X86) | |
8da5adda | 704 | { |
8da5adda DZ |
705 | .procname = "panic_on_unrecovered_nmi", |
706 | .data = &panic_on_unrecovered_nmi, | |
707 | .maxlen = sizeof(int), | |
708 | .mode = 0644, | |
6d456111 | 709 | .proc_handler = proc_dointvec, |
8da5adda | 710 | }, |
5211a242 | 711 | { |
5211a242 KG |
712 | .procname = "panic_on_io_nmi", |
713 | .data = &panic_on_io_nmi, | |
714 | .maxlen = sizeof(int), | |
715 | .mode = 0644, | |
6d456111 | 716 | .proc_handler = proc_dointvec, |
5211a242 | 717 | }, |
1da177e4 | 718 | { |
1da177e4 LT |
719 | .procname = "bootloader_type", |
720 | .data = &bootloader_type, | |
721 | .maxlen = sizeof (int), | |
722 | .mode = 0444, | |
6d456111 | 723 | .proc_handler = proc_dointvec, |
1da177e4 | 724 | }, |
5031296c | 725 | { |
5031296c PA |
726 | .procname = "bootloader_version", |
727 | .data = &bootloader_version, | |
728 | .maxlen = sizeof (int), | |
729 | .mode = 0444, | |
6d456111 | 730 | .proc_handler = proc_dointvec, |
5031296c | 731 | }, |
0741f4d2 | 732 | { |
0741f4d2 CE |
733 | .procname = "kstack_depth_to_print", |
734 | .data = &kstack_depth_to_print, | |
735 | .maxlen = sizeof(int), | |
736 | .mode = 0644, | |
6d456111 | 737 | .proc_handler = proc_dointvec, |
0741f4d2 | 738 | }, |
6e7c4025 | 739 | { |
6e7c4025 IM |
740 | .procname = "io_delay_type", |
741 | .data = &io_delay_type, | |
742 | .maxlen = sizeof(int), | |
743 | .mode = 0644, | |
6d456111 | 744 | .proc_handler = proc_dointvec, |
6e7c4025 | 745 | }, |
1da177e4 | 746 | #endif |
7a9166e3 | 747 | #if defined(CONFIG_MMU) |
1da177e4 | 748 | { |
1da177e4 LT |
749 | .procname = "randomize_va_space", |
750 | .data = &randomize_va_space, | |
751 | .maxlen = sizeof(int), | |
752 | .mode = 0644, | |
6d456111 | 753 | .proc_handler = proc_dointvec, |
1da177e4 | 754 | }, |
7a9166e3 | 755 | #endif |
0152fb37 | 756 | #if defined(CONFIG_S390) && defined(CONFIG_SMP) |
951f22d5 | 757 | { |
951f22d5 MS |
758 | .procname = "spin_retry", |
759 | .data = &spin_retry, | |
760 | .maxlen = sizeof (int), | |
761 | .mode = 0644, | |
6d456111 | 762 | .proc_handler = proc_dointvec, |
951f22d5 | 763 | }, |
c255d844 | 764 | #endif |
673d5b43 | 765 | #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86) |
c255d844 | 766 | { |
c255d844 | 767 | .procname = "acpi_video_flags", |
77afcf78 | 768 | .data = &acpi_realmode_flags, |
c255d844 PM |
769 | .maxlen = sizeof (unsigned long), |
770 | .mode = 0644, | |
6d456111 | 771 | .proc_handler = proc_doulongvec_minmax, |
c255d844 | 772 | }, |
d2b176ed JS |
773 | #endif |
774 | #ifdef CONFIG_IA64 | |
775 | { | |
d2b176ed JS |
776 | .procname = "ignore-unaligned-usertrap", |
777 | .data = &no_unaligned_warning, | |
778 | .maxlen = sizeof (int), | |
779 | .mode = 0644, | |
6d456111 | 780 | .proc_handler = proc_dointvec, |
d2b176ed | 781 | }, |
88fc241f | 782 | { |
88fc241f DC |
783 | .procname = "unaligned-dump-stack", |
784 | .data = &unaligned_dump_stack, | |
785 | .maxlen = sizeof (int), | |
786 | .mode = 0644, | |
6d456111 | 787 | .proc_handler = proc_dointvec, |
88fc241f | 788 | }, |
bebfa101 | 789 | #endif |
c4f3b63f | 790 | #ifdef CONFIG_DETECT_SOFTLOCKUP |
9c44bc03 | 791 | { |
9c44bc03 IM |
792 | .procname = "softlockup_panic", |
793 | .data = &softlockup_panic, | |
794 | .maxlen = sizeof(int), | |
795 | .mode = 0644, | |
6d456111 | 796 | .proc_handler = proc_dointvec_minmax, |
9c44bc03 IM |
797 | .extra1 = &zero, |
798 | .extra2 = &one, | |
799 | }, | |
c4f3b63f | 800 | { |
c4f3b63f RT |
801 | .procname = "softlockup_thresh", |
802 | .data = &softlockup_thresh, | |
9383d967 | 803 | .maxlen = sizeof(int), |
c4f3b63f | 804 | .mode = 0644, |
6d456111 | 805 | .proc_handler = proc_dosoftlockup_thresh, |
9383d967 | 806 | .extra1 = &neg_one, |
c4f3b63f RT |
807 | .extra2 = &sixty, |
808 | }, | |
e162b39a MSB |
809 | #endif |
810 | #ifdef CONFIG_DETECT_HUNG_TASK | |
811 | { | |
e162b39a MSB |
812 | .procname = "hung_task_panic", |
813 | .data = &sysctl_hung_task_panic, | |
814 | .maxlen = sizeof(int), | |
815 | .mode = 0644, | |
6d456111 | 816 | .proc_handler = proc_dointvec_minmax, |
e162b39a MSB |
817 | .extra1 = &zero, |
818 | .extra2 = &one, | |
819 | }, | |
82a1fcb9 | 820 | { |
82a1fcb9 IM |
821 | .procname = "hung_task_check_count", |
822 | .data = &sysctl_hung_task_check_count, | |
90739081 | 823 | .maxlen = sizeof(unsigned long), |
82a1fcb9 | 824 | .mode = 0644, |
6d456111 | 825 | .proc_handler = proc_doulongvec_minmax, |
82a1fcb9 IM |
826 | }, |
827 | { | |
82a1fcb9 IM |
828 | .procname = "hung_task_timeout_secs", |
829 | .data = &sysctl_hung_task_timeout_secs, | |
90739081 | 830 | .maxlen = sizeof(unsigned long), |
82a1fcb9 | 831 | .mode = 0644, |
6d456111 | 832 | .proc_handler = proc_dohung_task_timeout_secs, |
82a1fcb9 IM |
833 | }, |
834 | { | |
82a1fcb9 IM |
835 | .procname = "hung_task_warnings", |
836 | .data = &sysctl_hung_task_warnings, | |
90739081 | 837 | .maxlen = sizeof(unsigned long), |
82a1fcb9 | 838 | .mode = 0644, |
6d456111 | 839 | .proc_handler = proc_doulongvec_minmax, |
82a1fcb9 | 840 | }, |
c4f3b63f | 841 | #endif |
bebfa101 AK |
842 | #ifdef CONFIG_COMPAT |
843 | { | |
bebfa101 AK |
844 | .procname = "compat-log", |
845 | .data = &compat_log, | |
846 | .maxlen = sizeof (int), | |
847 | .mode = 0644, | |
6d456111 | 848 | .proc_handler = proc_dointvec, |
bebfa101 | 849 | }, |
951f22d5 | 850 | #endif |
23f78d4a IM |
851 | #ifdef CONFIG_RT_MUTEXES |
852 | { | |
23f78d4a IM |
853 | .procname = "max_lock_depth", |
854 | .data = &max_lock_depth, | |
855 | .maxlen = sizeof(int), | |
856 | .mode = 0644, | |
6d456111 | 857 | .proc_handler = proc_dointvec, |
23f78d4a | 858 | }, |
5096add8 | 859 | #endif |
10a0a8d4 | 860 | { |
10a0a8d4 JF |
861 | .procname = "poweroff_cmd", |
862 | .data = &poweroff_cmd, | |
863 | .maxlen = POWEROFF_CMD_PATH_LEN, | |
864 | .mode = 0644, | |
6d456111 | 865 | .proc_handler = proc_dostring, |
10a0a8d4 | 866 | }, |
0b77f5bf DH |
867 | #ifdef CONFIG_KEYS |
868 | { | |
0b77f5bf DH |
869 | .procname = "keys", |
870 | .mode = 0555, | |
871 | .child = key_sysctls, | |
872 | }, | |
873 | #endif | |
31a72bce PM |
874 | #ifdef CONFIG_RCU_TORTURE_TEST |
875 | { | |
31a72bce PM |
876 | .procname = "rcutorture_runnable", |
877 | .data = &rcutorture_runnable, | |
878 | .maxlen = sizeof(int), | |
879 | .mode = 0644, | |
6d456111 | 880 | .proc_handler = proc_dointvec, |
31a72bce PM |
881 | }, |
882 | #endif | |
12e22c5e DH |
883 | #ifdef CONFIG_SLOW_WORK |
884 | { | |
12e22c5e DH |
885 | .procname = "slow-work", |
886 | .mode = 0555, | |
887 | .child = slow_work_sysctls, | |
888 | }, | |
889 | #endif | |
cdd6c482 | 890 | #ifdef CONFIG_PERF_EVENTS |
1ccd1549 | 891 | { |
cdd6c482 IM |
892 | .procname = "perf_event_paranoid", |
893 | .data = &sysctl_perf_event_paranoid, | |
894 | .maxlen = sizeof(sysctl_perf_event_paranoid), | |
1ccd1549 | 895 | .mode = 0644, |
6d456111 | 896 | .proc_handler = proc_dointvec, |
1ccd1549 | 897 | }, |
c5078f78 | 898 | { |
cdd6c482 IM |
899 | .procname = "perf_event_mlock_kb", |
900 | .data = &sysctl_perf_event_mlock, | |
901 | .maxlen = sizeof(sysctl_perf_event_mlock), | |
c5078f78 | 902 | .mode = 0644, |
6d456111 | 903 | .proc_handler = proc_dointvec, |
c5078f78 | 904 | }, |
a78ac325 | 905 | { |
cdd6c482 IM |
906 | .procname = "perf_event_max_sample_rate", |
907 | .data = &sysctl_perf_event_sample_rate, | |
908 | .maxlen = sizeof(sysctl_perf_event_sample_rate), | |
a78ac325 | 909 | .mode = 0644, |
6d456111 | 910 | .proc_handler = proc_dointvec, |
a78ac325 | 911 | }, |
1ccd1549 | 912 | #endif |
dfec072e VN |
913 | #ifdef CONFIG_KMEMCHECK |
914 | { | |
dfec072e VN |
915 | .procname = "kmemcheck", |
916 | .data = &kmemcheck_enabled, | |
917 | .maxlen = sizeof(int), | |
918 | .mode = 0644, | |
6d456111 | 919 | .proc_handler = proc_dointvec, |
dfec072e VN |
920 | }, |
921 | #endif | |
cb684b5b | 922 | #ifdef CONFIG_BLOCK |
5e605b64 | 923 | { |
5e605b64 JA |
924 | .procname = "blk_iopoll", |
925 | .data = &blk_iopoll_enabled, | |
926 | .maxlen = sizeof(int), | |
927 | .mode = 0644, | |
6d456111 | 928 | .proc_handler = proc_dointvec, |
5e605b64 | 929 | }, |
cb684b5b | 930 | #endif |
ed2c12f3 AM |
931 | /* |
932 | * NOTE: do not add new entries to this table unless you have read | |
933 | * Documentation/sysctl/ctl_unnumbered.txt | |
934 | */ | |
6fce56ec | 935 | { } |
1da177e4 LT |
936 | }; |
937 | ||
d8217f07 | 938 | static struct ctl_table vm_table[] = { |
1da177e4 | 939 | { |
1da177e4 LT |
940 | .procname = "overcommit_memory", |
941 | .data = &sysctl_overcommit_memory, | |
942 | .maxlen = sizeof(sysctl_overcommit_memory), | |
943 | .mode = 0644, | |
6d456111 | 944 | .proc_handler = proc_dointvec, |
1da177e4 | 945 | }, |
fadd8fbd | 946 | { |
fadd8fbd KH |
947 | .procname = "panic_on_oom", |
948 | .data = &sysctl_panic_on_oom, | |
949 | .maxlen = sizeof(sysctl_panic_on_oom), | |
950 | .mode = 0644, | |
6d456111 | 951 | .proc_handler = proc_dointvec, |
fadd8fbd | 952 | }, |
fe071d7e | 953 | { |
fe071d7e DR |
954 | .procname = "oom_kill_allocating_task", |
955 | .data = &sysctl_oom_kill_allocating_task, | |
956 | .maxlen = sizeof(sysctl_oom_kill_allocating_task), | |
957 | .mode = 0644, | |
6d456111 | 958 | .proc_handler = proc_dointvec, |
fe071d7e | 959 | }, |
fef1bdd6 | 960 | { |
fef1bdd6 DR |
961 | .procname = "oom_dump_tasks", |
962 | .data = &sysctl_oom_dump_tasks, | |
963 | .maxlen = sizeof(sysctl_oom_dump_tasks), | |
964 | .mode = 0644, | |
6d456111 | 965 | .proc_handler = proc_dointvec, |
fef1bdd6 | 966 | }, |
1da177e4 | 967 | { |
1da177e4 LT |
968 | .procname = "overcommit_ratio", |
969 | .data = &sysctl_overcommit_ratio, | |
970 | .maxlen = sizeof(sysctl_overcommit_ratio), | |
971 | .mode = 0644, | |
6d456111 | 972 | .proc_handler = proc_dointvec, |
1da177e4 LT |
973 | }, |
974 | { | |
1da177e4 LT |
975 | .procname = "page-cluster", |
976 | .data = &page_cluster, | |
977 | .maxlen = sizeof(int), | |
978 | .mode = 0644, | |
6d456111 | 979 | .proc_handler = proc_dointvec, |
1da177e4 LT |
980 | }, |
981 | { | |
1da177e4 LT |
982 | .procname = "dirty_background_ratio", |
983 | .data = &dirty_background_ratio, | |
984 | .maxlen = sizeof(dirty_background_ratio), | |
985 | .mode = 0644, | |
6d456111 | 986 | .proc_handler = dirty_background_ratio_handler, |
1da177e4 LT |
987 | .extra1 = &zero, |
988 | .extra2 = &one_hundred, | |
989 | }, | |
2da02997 | 990 | { |
2da02997 DR |
991 | .procname = "dirty_background_bytes", |
992 | .data = &dirty_background_bytes, | |
993 | .maxlen = sizeof(dirty_background_bytes), | |
994 | .mode = 0644, | |
6d456111 | 995 | .proc_handler = dirty_background_bytes_handler, |
fc3501d4 | 996 | .extra1 = &one_ul, |
2da02997 | 997 | }, |
1da177e4 | 998 | { |
1da177e4 LT |
999 | .procname = "dirty_ratio", |
1000 | .data = &vm_dirty_ratio, | |
1001 | .maxlen = sizeof(vm_dirty_ratio), | |
1002 | .mode = 0644, | |
6d456111 | 1003 | .proc_handler = dirty_ratio_handler, |
1da177e4 LT |
1004 | .extra1 = &zero, |
1005 | .extra2 = &one_hundred, | |
1006 | }, | |
2da02997 | 1007 | { |
2da02997 DR |
1008 | .procname = "dirty_bytes", |
1009 | .data = &vm_dirty_bytes, | |
1010 | .maxlen = sizeof(vm_dirty_bytes), | |
1011 | .mode = 0644, | |
6d456111 | 1012 | .proc_handler = dirty_bytes_handler, |
9e4a5bda | 1013 | .extra1 = &dirty_bytes_min, |
2da02997 | 1014 | }, |
1da177e4 | 1015 | { |
1da177e4 | 1016 | .procname = "dirty_writeback_centisecs", |
f6ef9438 BS |
1017 | .data = &dirty_writeback_interval, |
1018 | .maxlen = sizeof(dirty_writeback_interval), | |
1da177e4 | 1019 | .mode = 0644, |
6d456111 | 1020 | .proc_handler = dirty_writeback_centisecs_handler, |
1da177e4 LT |
1021 | }, |
1022 | { | |
1da177e4 | 1023 | .procname = "dirty_expire_centisecs", |
f6ef9438 BS |
1024 | .data = &dirty_expire_interval, |
1025 | .maxlen = sizeof(dirty_expire_interval), | |
1da177e4 | 1026 | .mode = 0644, |
6d456111 | 1027 | .proc_handler = proc_dointvec, |
1da177e4 LT |
1028 | }, |
1029 | { | |
1da177e4 LT |
1030 | .procname = "nr_pdflush_threads", |
1031 | .data = &nr_pdflush_threads, | |
1032 | .maxlen = sizeof nr_pdflush_threads, | |
1033 | .mode = 0444 /* read-only*/, | |
6d456111 | 1034 | .proc_handler = proc_dointvec, |
1da177e4 LT |
1035 | }, |
1036 | { | |
1da177e4 LT |
1037 | .procname = "swappiness", |
1038 | .data = &vm_swappiness, | |
1039 | .maxlen = sizeof(vm_swappiness), | |
1040 | .mode = 0644, | |
6d456111 | 1041 | .proc_handler = proc_dointvec_minmax, |
1da177e4 LT |
1042 | .extra1 = &zero, |
1043 | .extra2 = &one_hundred, | |
1044 | }, | |
1045 | #ifdef CONFIG_HUGETLB_PAGE | |
1046 | { | |
1da177e4 | 1047 | .procname = "nr_hugepages", |
e5ff2159 | 1048 | .data = NULL, |
1da177e4 LT |
1049 | .maxlen = sizeof(unsigned long), |
1050 | .mode = 0644, | |
6d456111 | 1051 | .proc_handler = hugetlb_sysctl_handler, |
1da177e4 LT |
1052 | .extra1 = (void *)&hugetlb_zero, |
1053 | .extra2 = (void *)&hugetlb_infinity, | |
1054 | }, | |
1055 | { | |
1da177e4 LT |
1056 | .procname = "hugetlb_shm_group", |
1057 | .data = &sysctl_hugetlb_shm_group, | |
1058 | .maxlen = sizeof(gid_t), | |
1059 | .mode = 0644, | |
6d456111 | 1060 | .proc_handler = proc_dointvec, |
1da177e4 | 1061 | }, |
396faf03 | 1062 | { |
396faf03 MG |
1063 | .procname = "hugepages_treat_as_movable", |
1064 | .data = &hugepages_treat_as_movable, | |
1065 | .maxlen = sizeof(int), | |
1066 | .mode = 0644, | |
6d456111 | 1067 | .proc_handler = hugetlb_treat_movable_handler, |
396faf03 | 1068 | }, |
d1c3fb1f | 1069 | { |
d1c3fb1f | 1070 | .procname = "nr_overcommit_hugepages", |
e5ff2159 AK |
1071 | .data = NULL, |
1072 | .maxlen = sizeof(unsigned long), | |
d1c3fb1f | 1073 | .mode = 0644, |
6d456111 | 1074 | .proc_handler = hugetlb_overcommit_handler, |
e5ff2159 AK |
1075 | .extra1 = (void *)&hugetlb_zero, |
1076 | .extra2 = (void *)&hugetlb_infinity, | |
d1c3fb1f | 1077 | }, |
1da177e4 LT |
1078 | #endif |
1079 | { | |
1da177e4 LT |
1080 | .procname = "lowmem_reserve_ratio", |
1081 | .data = &sysctl_lowmem_reserve_ratio, | |
1082 | .maxlen = sizeof(sysctl_lowmem_reserve_ratio), | |
1083 | .mode = 0644, | |
6d456111 | 1084 | .proc_handler = lowmem_reserve_ratio_sysctl_handler, |
1da177e4 | 1085 | }, |
9d0243bc | 1086 | { |
9d0243bc AM |
1087 | .procname = "drop_caches", |
1088 | .data = &sysctl_drop_caches, | |
1089 | .maxlen = sizeof(int), | |
1090 | .mode = 0644, | |
1091 | .proc_handler = drop_caches_sysctl_handler, | |
9d0243bc | 1092 | }, |
1da177e4 | 1093 | { |
1da177e4 LT |
1094 | .procname = "min_free_kbytes", |
1095 | .data = &min_free_kbytes, | |
1096 | .maxlen = sizeof(min_free_kbytes), | |
1097 | .mode = 0644, | |
6d456111 | 1098 | .proc_handler = min_free_kbytes_sysctl_handler, |
1da177e4 LT |
1099 | .extra1 = &zero, |
1100 | }, | |
8ad4b1fb | 1101 | { |
8ad4b1fb RS |
1102 | .procname = "percpu_pagelist_fraction", |
1103 | .data = &percpu_pagelist_fraction, | |
1104 | .maxlen = sizeof(percpu_pagelist_fraction), | |
1105 | .mode = 0644, | |
6d456111 | 1106 | .proc_handler = percpu_pagelist_fraction_sysctl_handler, |
8ad4b1fb RS |
1107 | .extra1 = &min_percpu_pagelist_fract, |
1108 | }, | |
1da177e4 LT |
1109 | #ifdef CONFIG_MMU |
1110 | { | |
1da177e4 LT |
1111 | .procname = "max_map_count", |
1112 | .data = &sysctl_max_map_count, | |
1113 | .maxlen = sizeof(sysctl_max_map_count), | |
1114 | .mode = 0644, | |
6d456111 | 1115 | .proc_handler = proc_dointvec |
1da177e4 | 1116 | }, |
dd8632a1 PM |
1117 | #else |
1118 | { | |
dd8632a1 PM |
1119 | .procname = "nr_trim_pages", |
1120 | .data = &sysctl_nr_trim_pages, | |
1121 | .maxlen = sizeof(sysctl_nr_trim_pages), | |
1122 | .mode = 0644, | |
6d456111 | 1123 | .proc_handler = proc_dointvec_minmax, |
dd8632a1 PM |
1124 | .extra1 = &zero, |
1125 | }, | |
1da177e4 LT |
1126 | #endif |
1127 | { | |
1da177e4 LT |
1128 | .procname = "laptop_mode", |
1129 | .data = &laptop_mode, | |
1130 | .maxlen = sizeof(laptop_mode), | |
1131 | .mode = 0644, | |
6d456111 | 1132 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
1133 | }, |
1134 | { | |
1da177e4 LT |
1135 | .procname = "block_dump", |
1136 | .data = &block_dump, | |
1137 | .maxlen = sizeof(block_dump), | |
1138 | .mode = 0644, | |
6d456111 | 1139 | .proc_handler = proc_dointvec, |
1da177e4 LT |
1140 | .extra1 = &zero, |
1141 | }, | |
1142 | { | |
1da177e4 LT |
1143 | .procname = "vfs_cache_pressure", |
1144 | .data = &sysctl_vfs_cache_pressure, | |
1145 | .maxlen = sizeof(sysctl_vfs_cache_pressure), | |
1146 | .mode = 0644, | |
6d456111 | 1147 | .proc_handler = proc_dointvec, |
1da177e4 LT |
1148 | .extra1 = &zero, |
1149 | }, | |
1150 | #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT | |
1151 | { | |
1da177e4 LT |
1152 | .procname = "legacy_va_layout", |
1153 | .data = &sysctl_legacy_va_layout, | |
1154 | .maxlen = sizeof(sysctl_legacy_va_layout), | |
1155 | .mode = 0644, | |
6d456111 | 1156 | .proc_handler = proc_dointvec, |
1da177e4 LT |
1157 | .extra1 = &zero, |
1158 | }, | |
1159 | #endif | |
1743660b CL |
1160 | #ifdef CONFIG_NUMA |
1161 | { | |
1743660b CL |
1162 | .procname = "zone_reclaim_mode", |
1163 | .data = &zone_reclaim_mode, | |
1164 | .maxlen = sizeof(zone_reclaim_mode), | |
1165 | .mode = 0644, | |
6d456111 | 1166 | .proc_handler = proc_dointvec, |
c84db23c | 1167 | .extra1 = &zero, |
1743660b | 1168 | }, |
9614634f | 1169 | { |
9614634f CL |
1170 | .procname = "min_unmapped_ratio", |
1171 | .data = &sysctl_min_unmapped_ratio, | |
1172 | .maxlen = sizeof(sysctl_min_unmapped_ratio), | |
1173 | .mode = 0644, | |
6d456111 | 1174 | .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler, |
9614634f CL |
1175 | .extra1 = &zero, |
1176 | .extra2 = &one_hundred, | |
1177 | }, | |
0ff38490 | 1178 | { |
0ff38490 CL |
1179 | .procname = "min_slab_ratio", |
1180 | .data = &sysctl_min_slab_ratio, | |
1181 | .maxlen = sizeof(sysctl_min_slab_ratio), | |
1182 | .mode = 0644, | |
6d456111 | 1183 | .proc_handler = sysctl_min_slab_ratio_sysctl_handler, |
0ff38490 CL |
1184 | .extra1 = &zero, |
1185 | .extra2 = &one_hundred, | |
1186 | }, | |
e6e5494c | 1187 | #endif |
77461ab3 CL |
1188 | #ifdef CONFIG_SMP |
1189 | { | |
77461ab3 CL |
1190 | .procname = "stat_interval", |
1191 | .data = &sysctl_stat_interval, | |
1192 | .maxlen = sizeof(sysctl_stat_interval), | |
1193 | .mode = 0644, | |
6d456111 | 1194 | .proc_handler = proc_dointvec_jiffies, |
77461ab3 CL |
1195 | }, |
1196 | #endif | |
ed032189 | 1197 | { |
ed032189 | 1198 | .procname = "mmap_min_addr", |
788084ab EP |
1199 | .data = &dac_mmap_min_addr, |
1200 | .maxlen = sizeof(unsigned long), | |
ed032189 | 1201 | .mode = 0644, |
6d456111 | 1202 | .proc_handler = mmap_min_addr_handler, |
ed032189 | 1203 | }, |
f0c0b2b8 KH |
1204 | #ifdef CONFIG_NUMA |
1205 | { | |
f0c0b2b8 KH |
1206 | .procname = "numa_zonelist_order", |
1207 | .data = &numa_zonelist_order, | |
1208 | .maxlen = NUMA_ZONELIST_ORDER_LEN, | |
1209 | .mode = 0644, | |
6d456111 | 1210 | .proc_handler = numa_zonelist_order_handler, |
f0c0b2b8 KH |
1211 | }, |
1212 | #endif | |
2b8232ce | 1213 | #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \ |
5c36e657 | 1214 | (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL)) |
e6e5494c | 1215 | { |
e6e5494c IM |
1216 | .procname = "vdso_enabled", |
1217 | .data = &vdso_enabled, | |
1218 | .maxlen = sizeof(vdso_enabled), | |
1219 | .mode = 0644, | |
6d456111 | 1220 | .proc_handler = proc_dointvec, |
e6e5494c IM |
1221 | .extra1 = &zero, |
1222 | }, | |
1da177e4 | 1223 | #endif |
195cf453 BG |
1224 | #ifdef CONFIG_HIGHMEM |
1225 | { | |
195cf453 BG |
1226 | .procname = "highmem_is_dirtyable", |
1227 | .data = &vm_highmem_is_dirtyable, | |
1228 | .maxlen = sizeof(vm_highmem_is_dirtyable), | |
1229 | .mode = 0644, | |
6d456111 | 1230 | .proc_handler = proc_dointvec_minmax, |
195cf453 BG |
1231 | .extra1 = &zero, |
1232 | .extra2 = &one, | |
1233 | }, | |
1234 | #endif | |
4be6f6bb | 1235 | { |
4be6f6bb PZ |
1236 | .procname = "scan_unevictable_pages", |
1237 | .data = &scan_unevictable_pages, | |
1238 | .maxlen = sizeof(scan_unevictable_pages), | |
1239 | .mode = 0644, | |
6d456111 | 1240 | .proc_handler = scan_unevictable_handler, |
4be6f6bb | 1241 | }, |
6a46079c AK |
1242 | #ifdef CONFIG_MEMORY_FAILURE |
1243 | { | |
6a46079c AK |
1244 | .procname = "memory_failure_early_kill", |
1245 | .data = &sysctl_memory_failure_early_kill, | |
1246 | .maxlen = sizeof(sysctl_memory_failure_early_kill), | |
1247 | .mode = 0644, | |
6d456111 | 1248 | .proc_handler = proc_dointvec_minmax, |
6a46079c AK |
1249 | .extra1 = &zero, |
1250 | .extra2 = &one, | |
1251 | }, | |
1252 | { | |
6a46079c AK |
1253 | .procname = "memory_failure_recovery", |
1254 | .data = &sysctl_memory_failure_recovery, | |
1255 | .maxlen = sizeof(sysctl_memory_failure_recovery), | |
1256 | .mode = 0644, | |
6d456111 | 1257 | .proc_handler = proc_dointvec_minmax, |
6a46079c AK |
1258 | .extra1 = &zero, |
1259 | .extra2 = &one, | |
1260 | }, | |
1261 | #endif | |
1262 | ||
2be7fe07 AM |
1263 | /* |
1264 | * NOTE: do not add new entries to this table unless you have read | |
1265 | * Documentation/sysctl/ctl_unnumbered.txt | |
1266 | */ | |
6fce56ec | 1267 | { } |
1da177e4 LT |
1268 | }; |
1269 | ||
2abc26fc | 1270 | #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) |
d8217f07 | 1271 | static struct ctl_table binfmt_misc_table[] = { |
6fce56ec | 1272 | { } |
2abc26fc EB |
1273 | }; |
1274 | #endif | |
1275 | ||
d8217f07 | 1276 | static struct ctl_table fs_table[] = { |
1da177e4 | 1277 | { |
1da177e4 LT |
1278 | .procname = "inode-nr", |
1279 | .data = &inodes_stat, | |
1280 | .maxlen = 2*sizeof(int), | |
1281 | .mode = 0444, | |
6d456111 | 1282 | .proc_handler = proc_dointvec, |
1da177e4 LT |
1283 | }, |
1284 | { | |
1da177e4 LT |
1285 | .procname = "inode-state", |
1286 | .data = &inodes_stat, | |
1287 | .maxlen = 7*sizeof(int), | |
1288 | .mode = 0444, | |
6d456111 | 1289 | .proc_handler = proc_dointvec, |
1da177e4 LT |
1290 | }, |
1291 | { | |
1da177e4 LT |
1292 | .procname = "file-nr", |
1293 | .data = &files_stat, | |
1294 | .maxlen = 3*sizeof(int), | |
1295 | .mode = 0444, | |
6d456111 | 1296 | .proc_handler = proc_nr_files, |
1da177e4 LT |
1297 | }, |
1298 | { | |
1da177e4 LT |
1299 | .procname = "file-max", |
1300 | .data = &files_stat.max_files, | |
1301 | .maxlen = sizeof(int), | |
1302 | .mode = 0644, | |
6d456111 | 1303 | .proc_handler = proc_dointvec, |
1da177e4 | 1304 | }, |
9cfe015a | 1305 | { |
9cfe015a ED |
1306 | .procname = "nr_open", |
1307 | .data = &sysctl_nr_open, | |
1308 | .maxlen = sizeof(int), | |
1309 | .mode = 0644, | |
6d456111 | 1310 | .proc_handler = proc_dointvec_minmax, |
eceea0b3 AV |
1311 | .extra1 = &sysctl_nr_open_min, |
1312 | .extra2 = &sysctl_nr_open_max, | |
9cfe015a | 1313 | }, |
1da177e4 | 1314 | { |
1da177e4 LT |
1315 | .procname = "dentry-state", |
1316 | .data = &dentry_stat, | |
1317 | .maxlen = 6*sizeof(int), | |
1318 | .mode = 0444, | |
6d456111 | 1319 | .proc_handler = proc_dointvec, |
1da177e4 LT |
1320 | }, |
1321 | { | |
1da177e4 LT |
1322 | .procname = "overflowuid", |
1323 | .data = &fs_overflowuid, | |
1324 | .maxlen = sizeof(int), | |
1325 | .mode = 0644, | |
6d456111 | 1326 | .proc_handler = proc_dointvec_minmax, |
1da177e4 LT |
1327 | .extra1 = &minolduid, |
1328 | .extra2 = &maxolduid, | |
1329 | }, | |
1330 | { | |
1da177e4 LT |
1331 | .procname = "overflowgid", |
1332 | .data = &fs_overflowgid, | |
1333 | .maxlen = sizeof(int), | |
1334 | .mode = 0644, | |
6d456111 | 1335 | .proc_handler = proc_dointvec_minmax, |
1da177e4 LT |
1336 | .extra1 = &minolduid, |
1337 | .extra2 = &maxolduid, | |
1338 | }, | |
bfcd17a6 | 1339 | #ifdef CONFIG_FILE_LOCKING |
1da177e4 | 1340 | { |
1da177e4 LT |
1341 | .procname = "leases-enable", |
1342 | .data = &leases_enable, | |
1343 | .maxlen = sizeof(int), | |
1344 | .mode = 0644, | |
6d456111 | 1345 | .proc_handler = proc_dointvec, |
1da177e4 | 1346 | }, |
bfcd17a6 | 1347 | #endif |
1da177e4 LT |
1348 | #ifdef CONFIG_DNOTIFY |
1349 | { | |
1da177e4 LT |
1350 | .procname = "dir-notify-enable", |
1351 | .data = &dir_notify_enable, | |
1352 | .maxlen = sizeof(int), | |
1353 | .mode = 0644, | |
6d456111 | 1354 | .proc_handler = proc_dointvec, |
1da177e4 LT |
1355 | }, |
1356 | #endif | |
1357 | #ifdef CONFIG_MMU | |
bfcd17a6 | 1358 | #ifdef CONFIG_FILE_LOCKING |
1da177e4 | 1359 | { |
1da177e4 LT |
1360 | .procname = "lease-break-time", |
1361 | .data = &lease_break_time, | |
1362 | .maxlen = sizeof(int), | |
1363 | .mode = 0644, | |
6d456111 | 1364 | .proc_handler = proc_dointvec, |
1da177e4 | 1365 | }, |
bfcd17a6 | 1366 | #endif |
ebf3f09c | 1367 | #ifdef CONFIG_AIO |
1da177e4 | 1368 | { |
1da177e4 LT |
1369 | .procname = "aio-nr", |
1370 | .data = &aio_nr, | |
1371 | .maxlen = sizeof(aio_nr), | |
1372 | .mode = 0444, | |
6d456111 | 1373 | .proc_handler = proc_doulongvec_minmax, |
1da177e4 LT |
1374 | }, |
1375 | { | |
1da177e4 LT |
1376 | .procname = "aio-max-nr", |
1377 | .data = &aio_max_nr, | |
1378 | .maxlen = sizeof(aio_max_nr), | |
1379 | .mode = 0644, | |
6d456111 | 1380 | .proc_handler = proc_doulongvec_minmax, |
1da177e4 | 1381 | }, |
ebf3f09c | 1382 | #endif /* CONFIG_AIO */ |
2d9048e2 | 1383 | #ifdef CONFIG_INOTIFY_USER |
0399cb08 | 1384 | { |
0399cb08 RL |
1385 | .procname = "inotify", |
1386 | .mode = 0555, | |
1387 | .child = inotify_table, | |
1388 | }, | |
1389 | #endif | |
7ef9964e DL |
1390 | #ifdef CONFIG_EPOLL |
1391 | { | |
1392 | .procname = "epoll", | |
1393 | .mode = 0555, | |
1394 | .child = epoll_table, | |
1395 | }, | |
1396 | #endif | |
1da177e4 | 1397 | #endif |
d6e71144 | 1398 | { |
d6e71144 AC |
1399 | .procname = "suid_dumpable", |
1400 | .data = &suid_dumpable, | |
1401 | .maxlen = sizeof(int), | |
1402 | .mode = 0644, | |
6d456111 | 1403 | .proc_handler = proc_dointvec_minmax, |
8e654fba MW |
1404 | .extra1 = &zero, |
1405 | .extra2 = &two, | |
d6e71144 | 1406 | }, |
2abc26fc EB |
1407 | #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) |
1408 | { | |
2abc26fc EB |
1409 | .procname = "binfmt_misc", |
1410 | .mode = 0555, | |
1411 | .child = binfmt_misc_table, | |
1412 | }, | |
1413 | #endif | |
2be7fe07 AM |
1414 | /* |
1415 | * NOTE: do not add new entries to this table unless you have read | |
1416 | * Documentation/sysctl/ctl_unnumbered.txt | |
2be7fe07 | 1417 | */ |
6fce56ec | 1418 | { } |
1da177e4 LT |
1419 | }; |
1420 | ||
d8217f07 | 1421 | static struct ctl_table debug_table[] = { |
d0c3d534 | 1422 | #if defined(CONFIG_X86) || defined(CONFIG_PPC) |
abd4f750 | 1423 | { |
abd4f750 MAS |
1424 | .procname = "exception-trace", |
1425 | .data = &show_unhandled_signals, | |
1426 | .maxlen = sizeof(int), | |
1427 | .mode = 0644, | |
1428 | .proc_handler = proc_dointvec | |
1429 | }, | |
1430 | #endif | |
6fce56ec | 1431 | { } |
1da177e4 LT |
1432 | }; |
1433 | ||
d8217f07 | 1434 | static struct ctl_table dev_table[] = { |
6fce56ec | 1435 | { } |
0eeca283 | 1436 | }; |
1da177e4 | 1437 | |
330d57fb AV |
1438 | static DEFINE_SPINLOCK(sysctl_lock); |
1439 | ||
1440 | /* called under sysctl_lock */ | |
1441 | static int use_table(struct ctl_table_header *p) | |
1442 | { | |
1443 | if (unlikely(p->unregistering)) | |
1444 | return 0; | |
1445 | p->used++; | |
1446 | return 1; | |
1447 | } | |
1448 | ||
1449 | /* called under sysctl_lock */ | |
1450 | static void unuse_table(struct ctl_table_header *p) | |
1451 | { | |
1452 | if (!--p->used) | |
1453 | if (unlikely(p->unregistering)) | |
1454 | complete(p->unregistering); | |
1455 | } | |
1456 | ||
1457 | /* called under sysctl_lock, will reacquire if has to wait */ | |
1458 | static void start_unregistering(struct ctl_table_header *p) | |
1459 | { | |
1460 | /* | |
1461 | * if p->used is 0, nobody will ever touch that entry again; | |
1462 | * we'll eliminate all paths to it before dropping sysctl_lock | |
1463 | */ | |
1464 | if (unlikely(p->used)) { | |
1465 | struct completion wait; | |
1466 | init_completion(&wait); | |
1467 | p->unregistering = &wait; | |
1468 | spin_unlock(&sysctl_lock); | |
1469 | wait_for_completion(&wait); | |
1470 | spin_lock(&sysctl_lock); | |
f7e6ced4 AV |
1471 | } else { |
1472 | /* anything non-NULL; we'll never dereference it */ | |
1473 | p->unregistering = ERR_PTR(-EINVAL); | |
330d57fb AV |
1474 | } |
1475 | /* | |
1476 | * do not remove from the list until nobody holds it; walking the | |
1477 | * list in do_sysctl() relies on that. | |
1478 | */ | |
1479 | list_del_init(&p->ctl_entry); | |
1480 | } | |
1481 | ||
f7e6ced4 AV |
1482 | void sysctl_head_get(struct ctl_table_header *head) |
1483 | { | |
1484 | spin_lock(&sysctl_lock); | |
1485 | head->count++; | |
1486 | spin_unlock(&sysctl_lock); | |
1487 | } | |
1488 | ||
1489 | void sysctl_head_put(struct ctl_table_header *head) | |
1490 | { | |
1491 | spin_lock(&sysctl_lock); | |
1492 | if (!--head->count) | |
1493 | kfree(head); | |
1494 | spin_unlock(&sysctl_lock); | |
1495 | } | |
1496 | ||
1497 | struct ctl_table_header *sysctl_head_grab(struct ctl_table_header *head) | |
1498 | { | |
1499 | if (!head) | |
1500 | BUG(); | |
1501 | spin_lock(&sysctl_lock); | |
1502 | if (!use_table(head)) | |
1503 | head = ERR_PTR(-ENOENT); | |
1504 | spin_unlock(&sysctl_lock); | |
1505 | return head; | |
1506 | } | |
1507 | ||
805b5d5e EB |
1508 | void sysctl_head_finish(struct ctl_table_header *head) |
1509 | { | |
1510 | if (!head) | |
1511 | return; | |
1512 | spin_lock(&sysctl_lock); | |
1513 | unuse_table(head); | |
1514 | spin_unlock(&sysctl_lock); | |
1515 | } | |
1516 | ||
73455092 AV |
1517 | static struct ctl_table_set * |
1518 | lookup_header_set(struct ctl_table_root *root, struct nsproxy *namespaces) | |
1519 | { | |
1520 | struct ctl_table_set *set = &root->default_set; | |
1521 | if (root->lookup) | |
1522 | set = root->lookup(root, namespaces); | |
1523 | return set; | |
1524 | } | |
1525 | ||
e51b6ba0 EB |
1526 | static struct list_head * |
1527 | lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces) | |
805b5d5e | 1528 | { |
73455092 AV |
1529 | struct ctl_table_set *set = lookup_header_set(root, namespaces); |
1530 | return &set->list; | |
e51b6ba0 EB |
1531 | } |
1532 | ||
1533 | struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces, | |
1534 | struct ctl_table_header *prev) | |
1535 | { | |
1536 | struct ctl_table_root *root; | |
1537 | struct list_head *header_list; | |
805b5d5e EB |
1538 | struct ctl_table_header *head; |
1539 | struct list_head *tmp; | |
e51b6ba0 | 1540 | |
805b5d5e EB |
1541 | spin_lock(&sysctl_lock); |
1542 | if (prev) { | |
e51b6ba0 | 1543 | head = prev; |
805b5d5e EB |
1544 | tmp = &prev->ctl_entry; |
1545 | unuse_table(prev); | |
1546 | goto next; | |
1547 | } | |
1548 | tmp = &root_table_header.ctl_entry; | |
1549 | for (;;) { | |
1550 | head = list_entry(tmp, struct ctl_table_header, ctl_entry); | |
1551 | ||
1552 | if (!use_table(head)) | |
1553 | goto next; | |
1554 | spin_unlock(&sysctl_lock); | |
1555 | return head; | |
1556 | next: | |
e51b6ba0 | 1557 | root = head->root; |
805b5d5e | 1558 | tmp = tmp->next; |
e51b6ba0 EB |
1559 | header_list = lookup_header_list(root, namespaces); |
1560 | if (tmp != header_list) | |
1561 | continue; | |
1562 | ||
1563 | do { | |
1564 | root = list_entry(root->root_list.next, | |
1565 | struct ctl_table_root, root_list); | |
1566 | if (root == &sysctl_table_root) | |
1567 | goto out; | |
1568 | header_list = lookup_header_list(root, namespaces); | |
1569 | } while (list_empty(header_list)); | |
1570 | tmp = header_list->next; | |
805b5d5e | 1571 | } |
e51b6ba0 | 1572 | out: |
805b5d5e EB |
1573 | spin_unlock(&sysctl_lock); |
1574 | return NULL; | |
1575 | } | |
1576 | ||
e51b6ba0 EB |
1577 | struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev) |
1578 | { | |
1579 | return __sysctl_head_next(current->nsproxy, prev); | |
1580 | } | |
1581 | ||
1582 | void register_sysctl_root(struct ctl_table_root *root) | |
1583 | { | |
1584 | spin_lock(&sysctl_lock); | |
1585 | list_add_tail(&root->root_list, &sysctl_table_root.root_list); | |
1586 | spin_unlock(&sysctl_lock); | |
1587 | } | |
1588 | ||
1da177e4 | 1589 | /* |
1ff007eb | 1590 | * sysctl_perm does NOT grant the superuser all rights automatically, because |
1da177e4 LT |
1591 | * some sysctl variables are readonly even to root. |
1592 | */ | |
1593 | ||
1594 | static int test_perm(int mode, int op) | |
1595 | { | |
76aac0e9 | 1596 | if (!current_euid()) |
1da177e4 LT |
1597 | mode >>= 6; |
1598 | else if (in_egroup_p(0)) | |
1599 | mode >>= 3; | |
e6305c43 | 1600 | if ((op & ~mode & (MAY_READ|MAY_WRITE|MAY_EXEC)) == 0) |
1da177e4 LT |
1601 | return 0; |
1602 | return -EACCES; | |
1603 | } | |
1604 | ||
d7321cd6 | 1605 | int sysctl_perm(struct ctl_table_root *root, struct ctl_table *table, int op) |
1da177e4 LT |
1606 | { |
1607 | int error; | |
d7321cd6 PE |
1608 | int mode; |
1609 | ||
e6305c43 | 1610 | error = security_sysctl(table, op & (MAY_READ | MAY_WRITE | MAY_EXEC)); |
1da177e4 LT |
1611 | if (error) |
1612 | return error; | |
d7321cd6 PE |
1613 | |
1614 | if (root->permissions) | |
1615 | mode = root->permissions(root, current->nsproxy, table); | |
1616 | else | |
1617 | mode = table->mode; | |
1618 | ||
1619 | return test_perm(mode, op); | |
1da177e4 LT |
1620 | } |
1621 | ||
d912b0cc EB |
1622 | static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table) |
1623 | { | |
2315ffa0 | 1624 | for (; table->procname; table++) { |
d912b0cc EB |
1625 | table->parent = parent; |
1626 | if (table->child) | |
1627 | sysctl_set_parent(table, table->child); | |
1628 | } | |
1629 | } | |
1630 | ||
1631 | static __init int sysctl_init(void) | |
1632 | { | |
1633 | sysctl_set_parent(NULL, root_table); | |
88f458e4 HS |
1634 | #ifdef CONFIG_SYSCTL_SYSCALL_CHECK |
1635 | { | |
1636 | int err; | |
1637 | err = sysctl_check_table(current->nsproxy, root_table); | |
1638 | } | |
1639 | #endif | |
d912b0cc EB |
1640 | return 0; |
1641 | } | |
1642 | ||
1643 | core_initcall(sysctl_init); | |
1644 | ||
bfbcf034 AV |
1645 | static struct ctl_table *is_branch_in(struct ctl_table *branch, |
1646 | struct ctl_table *table) | |
ae7edecc AV |
1647 | { |
1648 | struct ctl_table *p; | |
1649 | const char *s = branch->procname; | |
1650 | ||
1651 | /* branch should have named subdirectory as its first element */ | |
1652 | if (!s || !branch->child) | |
bfbcf034 | 1653 | return NULL; |
ae7edecc AV |
1654 | |
1655 | /* ... and nothing else */ | |
2315ffa0 | 1656 | if (branch[1].procname) |
bfbcf034 | 1657 | return NULL; |
ae7edecc AV |
1658 | |
1659 | /* table should contain subdirectory with the same name */ | |
2315ffa0 | 1660 | for (p = table; p->procname; p++) { |
ae7edecc AV |
1661 | if (!p->child) |
1662 | continue; | |
1663 | if (p->procname && strcmp(p->procname, s) == 0) | |
bfbcf034 | 1664 | return p; |
ae7edecc | 1665 | } |
bfbcf034 | 1666 | return NULL; |
ae7edecc AV |
1667 | } |
1668 | ||
1669 | /* see if attaching q to p would be an improvement */ | |
1670 | static void try_attach(struct ctl_table_header *p, struct ctl_table_header *q) | |
1671 | { | |
1672 | struct ctl_table *to = p->ctl_table, *by = q->ctl_table; | |
bfbcf034 | 1673 | struct ctl_table *next; |
ae7edecc AV |
1674 | int is_better = 0; |
1675 | int not_in_parent = !p->attached_by; | |
1676 | ||
bfbcf034 | 1677 | while ((next = is_branch_in(by, to)) != NULL) { |
ae7edecc AV |
1678 | if (by == q->attached_by) |
1679 | is_better = 1; | |
1680 | if (to == p->attached_by) | |
1681 | not_in_parent = 1; | |
1682 | by = by->child; | |
bfbcf034 | 1683 | to = next->child; |
ae7edecc AV |
1684 | } |
1685 | ||
1686 | if (is_better && not_in_parent) { | |
1687 | q->attached_by = by; | |
1688 | q->attached_to = to; | |
1689 | q->parent = p; | |
1690 | } | |
1691 | } | |
1692 | ||
1da177e4 | 1693 | /** |
e51b6ba0 EB |
1694 | * __register_sysctl_paths - register a sysctl hierarchy |
1695 | * @root: List of sysctl headers to register on | |
1696 | * @namespaces: Data to compute which lists of sysctl entries are visible | |
29e796fd | 1697 | * @path: The path to the directory the sysctl table is in. |
1da177e4 | 1698 | * @table: the top-level table structure |
1da177e4 LT |
1699 | * |
1700 | * Register a sysctl table hierarchy. @table should be a filled in ctl_table | |
29e796fd | 1701 | * array. A completely 0 filled entry terminates the table. |
1da177e4 | 1702 | * |
d8217f07 | 1703 | * The members of the &struct ctl_table structure are used as follows: |
1da177e4 | 1704 | * |
1da177e4 LT |
1705 | * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not |
1706 | * enter a sysctl file | |
1707 | * | |
1708 | * data - a pointer to data for use by proc_handler | |
1709 | * | |
1710 | * maxlen - the maximum size in bytes of the data | |
1711 | * | |
1712 | * mode - the file permissions for the /proc/sys file, and for sysctl(2) | |
1713 | * | |
1714 | * child - a pointer to the child sysctl table if this entry is a directory, or | |
1715 | * %NULL. | |
1716 | * | |
1717 | * proc_handler - the text handler routine (described below) | |
1718 | * | |
1da177e4 LT |
1719 | * de - for internal use by the sysctl routines |
1720 | * | |
1721 | * extra1, extra2 - extra pointers usable by the proc handler routines | |
1722 | * | |
1723 | * Leaf nodes in the sysctl tree will be represented by a single file | |
1724 | * under /proc; non-leaf nodes will be represented by directories. | |
1725 | * | |
1726 | * sysctl(2) can automatically manage read and write requests through | |
1727 | * the sysctl table. The data and maxlen fields of the ctl_table | |
1728 | * struct enable minimal validation of the values being written to be | |
1729 | * performed, and the mode field allows minimal authentication. | |
1730 | * | |
1da177e4 LT |
1731 | * There must be a proc_handler routine for any terminal nodes |
1732 | * mirrored under /proc/sys (non-terminals are handled by a built-in | |
1733 | * directory handler). Several default handlers are available to | |
1734 | * cover common cases - | |
1735 | * | |
1736 | * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(), | |
1737 | * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(), | |
1738 | * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax() | |
1739 | * | |
1740 | * It is the handler's job to read the input buffer from user memory | |
1741 | * and process it. The handler should return 0 on success. | |
1742 | * | |
1743 | * This routine returns %NULL on a failure to register, and a pointer | |
1744 | * to the table header on success. | |
1745 | */ | |
e51b6ba0 EB |
1746 | struct ctl_table_header *__register_sysctl_paths( |
1747 | struct ctl_table_root *root, | |
1748 | struct nsproxy *namespaces, | |
1749 | const struct ctl_path *path, struct ctl_table *table) | |
1da177e4 | 1750 | { |
29e796fd EB |
1751 | struct ctl_table_header *header; |
1752 | struct ctl_table *new, **prevp; | |
1753 | unsigned int n, npath; | |
ae7edecc | 1754 | struct ctl_table_set *set; |
29e796fd EB |
1755 | |
1756 | /* Count the path components */ | |
2315ffa0 | 1757 | for (npath = 0; path[npath].procname; ++npath) |
29e796fd EB |
1758 | ; |
1759 | ||
1760 | /* | |
1761 | * For each path component, allocate a 2-element ctl_table array. | |
1762 | * The first array element will be filled with the sysctl entry | |
2315ffa0 | 1763 | * for this, the second will be the sentinel (procname == 0). |
29e796fd EB |
1764 | * |
1765 | * We allocate everything in one go so that we don't have to | |
1766 | * worry about freeing additional memory in unregister_sysctl_table. | |
1767 | */ | |
1768 | header = kzalloc(sizeof(struct ctl_table_header) + | |
1769 | (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL); | |
1770 | if (!header) | |
1da177e4 | 1771 | return NULL; |
29e796fd EB |
1772 | |
1773 | new = (struct ctl_table *) (header + 1); | |
1774 | ||
1775 | /* Now connect the dots */ | |
1776 | prevp = &header->ctl_table; | |
1777 | for (n = 0; n < npath; ++n, ++path) { | |
1778 | /* Copy the procname */ | |
1779 | new->procname = path->procname; | |
29e796fd EB |
1780 | new->mode = 0555; |
1781 | ||
1782 | *prevp = new; | |
1783 | prevp = &new->child; | |
1784 | ||
1785 | new += 2; | |
1786 | } | |
1787 | *prevp = table; | |
23eb06de | 1788 | header->ctl_table_arg = table; |
29e796fd EB |
1789 | |
1790 | INIT_LIST_HEAD(&header->ctl_entry); | |
1791 | header->used = 0; | |
1792 | header->unregistering = NULL; | |
e51b6ba0 | 1793 | header->root = root; |
29e796fd | 1794 | sysctl_set_parent(NULL, header->ctl_table); |
f7e6ced4 | 1795 | header->count = 1; |
88f458e4 | 1796 | #ifdef CONFIG_SYSCTL_SYSCALL_CHECK |
e51b6ba0 | 1797 | if (sysctl_check_table(namespaces, header->ctl_table)) { |
29e796fd | 1798 | kfree(header); |
fc6cd25b EB |
1799 | return NULL; |
1800 | } | |
88f458e4 | 1801 | #endif |
330d57fb | 1802 | spin_lock(&sysctl_lock); |
73455092 | 1803 | header->set = lookup_header_set(root, namespaces); |
ae7edecc AV |
1804 | header->attached_by = header->ctl_table; |
1805 | header->attached_to = root_table; | |
1806 | header->parent = &root_table_header; | |
1807 | for (set = header->set; set; set = set->parent) { | |
1808 | struct ctl_table_header *p; | |
1809 | list_for_each_entry(p, &set->list, ctl_entry) { | |
1810 | if (p->unregistering) | |
1811 | continue; | |
1812 | try_attach(p, header); | |
1813 | } | |
1814 | } | |
1815 | header->parent->count++; | |
73455092 | 1816 | list_add_tail(&header->ctl_entry, &header->set->list); |
330d57fb | 1817 | spin_unlock(&sysctl_lock); |
29e796fd EB |
1818 | |
1819 | return header; | |
1820 | } | |
1821 | ||
e51b6ba0 EB |
1822 | /** |
1823 | * register_sysctl_table_path - register a sysctl table hierarchy | |
1824 | * @path: The path to the directory the sysctl table is in. | |
1825 | * @table: the top-level table structure | |
1826 | * | |
1827 | * Register a sysctl table hierarchy. @table should be a filled in ctl_table | |
1828 | * array. A completely 0 filled entry terminates the table. | |
1829 | * | |
1830 | * See __register_sysctl_paths for more details. | |
1831 | */ | |
1832 | struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path, | |
1833 | struct ctl_table *table) | |
1834 | { | |
1835 | return __register_sysctl_paths(&sysctl_table_root, current->nsproxy, | |
1836 | path, table); | |
1837 | } | |
1838 | ||
29e796fd EB |
1839 | /** |
1840 | * register_sysctl_table - register a sysctl table hierarchy | |
1841 | * @table: the top-level table structure | |
1842 | * | |
1843 | * Register a sysctl table hierarchy. @table should be a filled in ctl_table | |
1844 | * array. A completely 0 filled entry terminates the table. | |
1845 | * | |
1846 | * See register_sysctl_paths for more details. | |
1847 | */ | |
1848 | struct ctl_table_header *register_sysctl_table(struct ctl_table *table) | |
1849 | { | |
1850 | static const struct ctl_path null_path[] = { {} }; | |
1851 | ||
1852 | return register_sysctl_paths(null_path, table); | |
1da177e4 LT |
1853 | } |
1854 | ||
1855 | /** | |
1856 | * unregister_sysctl_table - unregister a sysctl table hierarchy | |
1857 | * @header: the header returned from register_sysctl_table | |
1858 | * | |
1859 | * Unregisters the sysctl table and all children. proc entries may not | |
1860 | * actually be removed until they are no longer used by anyone. | |
1861 | */ | |
1862 | void unregister_sysctl_table(struct ctl_table_header * header) | |
1863 | { | |
330d57fb | 1864 | might_sleep(); |
f1dad166 PE |
1865 | |
1866 | if (header == NULL) | |
1867 | return; | |
1868 | ||
330d57fb AV |
1869 | spin_lock(&sysctl_lock); |
1870 | start_unregistering(header); | |
ae7edecc AV |
1871 | if (!--header->parent->count) { |
1872 | WARN_ON(1); | |
1873 | kfree(header->parent); | |
1874 | } | |
f7e6ced4 AV |
1875 | if (!--header->count) |
1876 | kfree(header); | |
330d57fb | 1877 | spin_unlock(&sysctl_lock); |
1da177e4 LT |
1878 | } |
1879 | ||
9043476f AV |
1880 | int sysctl_is_seen(struct ctl_table_header *p) |
1881 | { | |
1882 | struct ctl_table_set *set = p->set; | |
1883 | int res; | |
1884 | spin_lock(&sysctl_lock); | |
1885 | if (p->unregistering) | |
1886 | res = 0; | |
1887 | else if (!set->is_seen) | |
1888 | res = 1; | |
1889 | else | |
1890 | res = set->is_seen(set); | |
1891 | spin_unlock(&sysctl_lock); | |
1892 | return res; | |
1893 | } | |
1894 | ||
73455092 AV |
1895 | void setup_sysctl_set(struct ctl_table_set *p, |
1896 | struct ctl_table_set *parent, | |
1897 | int (*is_seen)(struct ctl_table_set *)) | |
1898 | { | |
1899 | INIT_LIST_HEAD(&p->list); | |
1900 | p->parent = parent ? parent : &sysctl_table_root.default_set; | |
1901 | p->is_seen = is_seen; | |
1902 | } | |
1903 | ||
b89a8171 | 1904 | #else /* !CONFIG_SYSCTL */ |
d8217f07 | 1905 | struct ctl_table_header *register_sysctl_table(struct ctl_table * table) |
b89a8171 EB |
1906 | { |
1907 | return NULL; | |
1908 | } | |
1909 | ||
29e796fd EB |
1910 | struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path, |
1911 | struct ctl_table *table) | |
1912 | { | |
1913 | return NULL; | |
1914 | } | |
1915 | ||
b89a8171 EB |
1916 | void unregister_sysctl_table(struct ctl_table_header * table) |
1917 | { | |
1918 | } | |
1919 | ||
73455092 AV |
1920 | void setup_sysctl_set(struct ctl_table_set *p, |
1921 | struct ctl_table_set *parent, | |
1922 | int (*is_seen)(struct ctl_table_set *)) | |
1923 | { | |
1924 | } | |
1925 | ||
f7e6ced4 AV |
1926 | void sysctl_head_put(struct ctl_table_header *head) |
1927 | { | |
1928 | } | |
1929 | ||
b89a8171 EB |
1930 | #endif /* CONFIG_SYSCTL */ |
1931 | ||
1da177e4 LT |
1932 | /* |
1933 | * /proc/sys support | |
1934 | */ | |
1935 | ||
b89a8171 | 1936 | #ifdef CONFIG_PROC_SYSCTL |
1da177e4 | 1937 | |
b1ba4ddd | 1938 | static int _proc_do_string(void* data, int maxlen, int write, |
8d65af78 | 1939 | void __user *buffer, |
b1ba4ddd | 1940 | size_t *lenp, loff_t *ppos) |
1da177e4 LT |
1941 | { |
1942 | size_t len; | |
1943 | char __user *p; | |
1944 | char c; | |
8d060877 ON |
1945 | |
1946 | if (!data || !maxlen || !*lenp) { | |
1da177e4 LT |
1947 | *lenp = 0; |
1948 | return 0; | |
1949 | } | |
8d060877 | 1950 | |
1da177e4 LT |
1951 | if (write) { |
1952 | len = 0; | |
1953 | p = buffer; | |
1954 | while (len < *lenp) { | |
1955 | if (get_user(c, p++)) | |
1956 | return -EFAULT; | |
1957 | if (c == 0 || c == '\n') | |
1958 | break; | |
1959 | len++; | |
1960 | } | |
f5dd3d6f SV |
1961 | if (len >= maxlen) |
1962 | len = maxlen-1; | |
1963 | if(copy_from_user(data, buffer, len)) | |
1da177e4 | 1964 | return -EFAULT; |
f5dd3d6f | 1965 | ((char *) data)[len] = 0; |
1da177e4 LT |
1966 | *ppos += *lenp; |
1967 | } else { | |
f5dd3d6f SV |
1968 | len = strlen(data); |
1969 | if (len > maxlen) | |
1970 | len = maxlen; | |
8d060877 ON |
1971 | |
1972 | if (*ppos > len) { | |
1973 | *lenp = 0; | |
1974 | return 0; | |
1975 | } | |
1976 | ||
1977 | data += *ppos; | |
1978 | len -= *ppos; | |
1979 | ||
1da177e4 LT |
1980 | if (len > *lenp) |
1981 | len = *lenp; | |
1982 | if (len) | |
f5dd3d6f | 1983 | if(copy_to_user(buffer, data, len)) |
1da177e4 LT |
1984 | return -EFAULT; |
1985 | if (len < *lenp) { | |
1986 | if(put_user('\n', ((char __user *) buffer) + len)) | |
1987 | return -EFAULT; | |
1988 | len++; | |
1989 | } | |
1990 | *lenp = len; | |
1991 | *ppos += len; | |
1992 | } | |
1993 | return 0; | |
1994 | } | |
1995 | ||
f5dd3d6f SV |
1996 | /** |
1997 | * proc_dostring - read a string sysctl | |
1998 | * @table: the sysctl table | |
1999 | * @write: %TRUE if this is a write to the sysctl file | |
f5dd3d6f SV |
2000 | * @buffer: the user buffer |
2001 | * @lenp: the size of the user buffer | |
2002 | * @ppos: file position | |
2003 | * | |
2004 | * Reads/writes a string from/to the user buffer. If the kernel | |
2005 | * buffer provided is not large enough to hold the string, the | |
2006 | * string is truncated. The copied string is %NULL-terminated. | |
2007 | * If the string is being read by the user process, it is copied | |
2008 | * and a newline '\n' is added. It is truncated if the buffer is | |
2009 | * not large enough. | |
2010 | * | |
2011 | * Returns 0 on success. | |
2012 | */ | |
8d65af78 | 2013 | int proc_dostring(struct ctl_table *table, int write, |
f5dd3d6f SV |
2014 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2015 | { | |
8d65af78 | 2016 | return _proc_do_string(table->data, table->maxlen, write, |
f5dd3d6f SV |
2017 | buffer, lenp, ppos); |
2018 | } | |
2019 | ||
1da177e4 LT |
2020 | |
2021 | static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp, | |
2022 | int *valp, | |
2023 | int write, void *data) | |
2024 | { | |
2025 | if (write) { | |
2026 | *valp = *negp ? -*lvalp : *lvalp; | |
2027 | } else { | |
2028 | int val = *valp; | |
2029 | if (val < 0) { | |
2030 | *negp = -1; | |
2031 | *lvalp = (unsigned long)-val; | |
2032 | } else { | |
2033 | *negp = 0; | |
2034 | *lvalp = (unsigned long)val; | |
2035 | } | |
2036 | } | |
2037 | return 0; | |
2038 | } | |
2039 | ||
d8217f07 | 2040 | static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table, |
8d65af78 | 2041 | int write, void __user *buffer, |
fcfbd547 | 2042 | size_t *lenp, loff_t *ppos, |
1da177e4 LT |
2043 | int (*conv)(int *negp, unsigned long *lvalp, int *valp, |
2044 | int write, void *data), | |
2045 | void *data) | |
2046 | { | |
2047 | #define TMPBUFLEN 21 | |
7338f299 | 2048 | int *i, vleft, first = 1, neg; |
1da177e4 LT |
2049 | unsigned long lval; |
2050 | size_t left, len; | |
2051 | ||
2052 | char buf[TMPBUFLEN], *p; | |
2053 | char __user *s = buffer; | |
2054 | ||
fcfbd547 | 2055 | if (!tbl_data || !table->maxlen || !*lenp || |
1da177e4 LT |
2056 | (*ppos && !write)) { |
2057 | *lenp = 0; | |
2058 | return 0; | |
2059 | } | |
2060 | ||
fcfbd547 | 2061 | i = (int *) tbl_data; |
1da177e4 LT |
2062 | vleft = table->maxlen / sizeof(*i); |
2063 | left = *lenp; | |
2064 | ||
2065 | if (!conv) | |
2066 | conv = do_proc_dointvec_conv; | |
2067 | ||
2068 | for (; left && vleft--; i++, first=0) { | |
2069 | if (write) { | |
2070 | while (left) { | |
2071 | char c; | |
2072 | if (get_user(c, s)) | |
2073 | return -EFAULT; | |
2074 | if (!isspace(c)) | |
2075 | break; | |
2076 | left--; | |
2077 | s++; | |
2078 | } | |
2079 | if (!left) | |
2080 | break; | |
2081 | neg = 0; | |
2082 | len = left; | |
2083 | if (len > sizeof(buf) - 1) | |
2084 | len = sizeof(buf) - 1; | |
2085 | if (copy_from_user(buf, s, len)) | |
2086 | return -EFAULT; | |
2087 | buf[len] = 0; | |
2088 | p = buf; | |
2089 | if (*p == '-' && left > 1) { | |
2090 | neg = 1; | |
bd9b0bac | 2091 | p++; |
1da177e4 LT |
2092 | } |
2093 | if (*p < '0' || *p > '9') | |
2094 | break; | |
2095 | ||
2096 | lval = simple_strtoul(p, &p, 0); | |
2097 | ||
2098 | len = p-buf; | |
2099 | if ((len < left) && *p && !isspace(*p)) | |
2100 | break; | |
1da177e4 LT |
2101 | s += len; |
2102 | left -= len; | |
2103 | ||
2104 | if (conv(&neg, &lval, i, 1, data)) | |
2105 | break; | |
2106 | } else { | |
2107 | p = buf; | |
2108 | if (!first) | |
2109 | *p++ = '\t'; | |
2110 | ||
2111 | if (conv(&neg, &lval, i, 0, data)) | |
2112 | break; | |
2113 | ||
2114 | sprintf(p, "%s%lu", neg ? "-" : "", lval); | |
2115 | len = strlen(buf); | |
2116 | if (len > left) | |
2117 | len = left; | |
2118 | if(copy_to_user(s, buf, len)) | |
2119 | return -EFAULT; | |
2120 | left -= len; | |
2121 | s += len; | |
2122 | } | |
2123 | } | |
2124 | ||
2125 | if (!write && !first && left) { | |
2126 | if(put_user('\n', s)) | |
2127 | return -EFAULT; | |
2128 | left--, s++; | |
2129 | } | |
2130 | if (write) { | |
2131 | while (left) { | |
2132 | char c; | |
2133 | if (get_user(c, s++)) | |
2134 | return -EFAULT; | |
2135 | if (!isspace(c)) | |
2136 | break; | |
2137 | left--; | |
2138 | } | |
2139 | } | |
2140 | if (write && first) | |
2141 | return -EINVAL; | |
2142 | *lenp -= left; | |
2143 | *ppos += *lenp; | |
2144 | return 0; | |
2145 | #undef TMPBUFLEN | |
2146 | } | |
2147 | ||
8d65af78 | 2148 | static int do_proc_dointvec(struct ctl_table *table, int write, |
fcfbd547 KK |
2149 | void __user *buffer, size_t *lenp, loff_t *ppos, |
2150 | int (*conv)(int *negp, unsigned long *lvalp, int *valp, | |
2151 | int write, void *data), | |
2152 | void *data) | |
2153 | { | |
8d65af78 | 2154 | return __do_proc_dointvec(table->data, table, write, |
fcfbd547 KK |
2155 | buffer, lenp, ppos, conv, data); |
2156 | } | |
2157 | ||
1da177e4 LT |
2158 | /** |
2159 | * proc_dointvec - read a vector of integers | |
2160 | * @table: the sysctl table | |
2161 | * @write: %TRUE if this is a write to the sysctl file | |
1da177e4 LT |
2162 | * @buffer: the user buffer |
2163 | * @lenp: the size of the user buffer | |
2164 | * @ppos: file position | |
2165 | * | |
2166 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer | |
2167 | * values from/to the user buffer, treated as an ASCII string. | |
2168 | * | |
2169 | * Returns 0 on success. | |
2170 | */ | |
8d65af78 | 2171 | int proc_dointvec(struct ctl_table *table, int write, |
1da177e4 LT |
2172 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2173 | { | |
8d65af78 | 2174 | return do_proc_dointvec(table,write,buffer,lenp,ppos, |
1da177e4 LT |
2175 | NULL,NULL); |
2176 | } | |
2177 | ||
34f5a398 | 2178 | /* |
25ddbb18 AK |
2179 | * Taint values can only be increased |
2180 | * This means we can safely use a temporary. | |
34f5a398 | 2181 | */ |
8d65af78 | 2182 | static int proc_taint(struct ctl_table *table, int write, |
34f5a398 TT |
2183 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2184 | { | |
25ddbb18 AK |
2185 | struct ctl_table t; |
2186 | unsigned long tmptaint = get_taint(); | |
2187 | int err; | |
34f5a398 | 2188 | |
91fcd412 | 2189 | if (write && !capable(CAP_SYS_ADMIN)) |
34f5a398 TT |
2190 | return -EPERM; |
2191 | ||
25ddbb18 AK |
2192 | t = *table; |
2193 | t.data = &tmptaint; | |
8d65af78 | 2194 | err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos); |
25ddbb18 AK |
2195 | if (err < 0) |
2196 | return err; | |
2197 | ||
2198 | if (write) { | |
2199 | /* | |
2200 | * Poor man's atomic or. Not worth adding a primitive | |
2201 | * to everyone's atomic.h for this | |
2202 | */ | |
2203 | int i; | |
2204 | for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) { | |
2205 | if ((tmptaint >> i) & 1) | |
2206 | add_taint(i); | |
2207 | } | |
2208 | } | |
2209 | ||
2210 | return err; | |
34f5a398 TT |
2211 | } |
2212 | ||
1da177e4 LT |
2213 | struct do_proc_dointvec_minmax_conv_param { |
2214 | int *min; | |
2215 | int *max; | |
2216 | }; | |
2217 | ||
2218 | static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp, | |
2219 | int *valp, | |
2220 | int write, void *data) | |
2221 | { | |
2222 | struct do_proc_dointvec_minmax_conv_param *param = data; | |
2223 | if (write) { | |
2224 | int val = *negp ? -*lvalp : *lvalp; | |
2225 | if ((param->min && *param->min > val) || | |
2226 | (param->max && *param->max < val)) | |
2227 | return -EINVAL; | |
2228 | *valp = val; | |
2229 | } else { | |
2230 | int val = *valp; | |
2231 | if (val < 0) { | |
2232 | *negp = -1; | |
2233 | *lvalp = (unsigned long)-val; | |
2234 | } else { | |
2235 | *negp = 0; | |
2236 | *lvalp = (unsigned long)val; | |
2237 | } | |
2238 | } | |
2239 | return 0; | |
2240 | } | |
2241 | ||
2242 | /** | |
2243 | * proc_dointvec_minmax - read a vector of integers with min/max values | |
2244 | * @table: the sysctl table | |
2245 | * @write: %TRUE if this is a write to the sysctl file | |
1da177e4 LT |
2246 | * @buffer: the user buffer |
2247 | * @lenp: the size of the user buffer | |
2248 | * @ppos: file position | |
2249 | * | |
2250 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer | |
2251 | * values from/to the user buffer, treated as an ASCII string. | |
2252 | * | |
2253 | * This routine will ensure the values are within the range specified by | |
2254 | * table->extra1 (min) and table->extra2 (max). | |
2255 | * | |
2256 | * Returns 0 on success. | |
2257 | */ | |
8d65af78 | 2258 | int proc_dointvec_minmax(struct ctl_table *table, int write, |
1da177e4 LT |
2259 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2260 | { | |
2261 | struct do_proc_dointvec_minmax_conv_param param = { | |
2262 | .min = (int *) table->extra1, | |
2263 | .max = (int *) table->extra2, | |
2264 | }; | |
8d65af78 | 2265 | return do_proc_dointvec(table, write, buffer, lenp, ppos, |
1da177e4 LT |
2266 | do_proc_dointvec_minmax_conv, ¶m); |
2267 | } | |
2268 | ||
d8217f07 | 2269 | static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write, |
1da177e4 LT |
2270 | void __user *buffer, |
2271 | size_t *lenp, loff_t *ppos, | |
2272 | unsigned long convmul, | |
2273 | unsigned long convdiv) | |
2274 | { | |
2275 | #define TMPBUFLEN 21 | |
2276 | unsigned long *i, *min, *max, val; | |
2277 | int vleft, first=1, neg; | |
2278 | size_t len, left; | |
2279 | char buf[TMPBUFLEN], *p; | |
2280 | char __user *s = buffer; | |
2281 | ||
fcfbd547 | 2282 | if (!data || !table->maxlen || !*lenp || |
1da177e4 LT |
2283 | (*ppos && !write)) { |
2284 | *lenp = 0; | |
2285 | return 0; | |
2286 | } | |
2287 | ||
fcfbd547 | 2288 | i = (unsigned long *) data; |
1da177e4 LT |
2289 | min = (unsigned long *) table->extra1; |
2290 | max = (unsigned long *) table->extra2; | |
2291 | vleft = table->maxlen / sizeof(unsigned long); | |
2292 | left = *lenp; | |
2293 | ||
2294 | for (; left && vleft--; i++, min++, max++, first=0) { | |
2295 | if (write) { | |
2296 | while (left) { | |
2297 | char c; | |
2298 | if (get_user(c, s)) | |
2299 | return -EFAULT; | |
2300 | if (!isspace(c)) | |
2301 | break; | |
2302 | left--; | |
2303 | s++; | |
2304 | } | |
2305 | if (!left) | |
2306 | break; | |
2307 | neg = 0; | |
2308 | len = left; | |
2309 | if (len > TMPBUFLEN-1) | |
2310 | len = TMPBUFLEN-1; | |
2311 | if (copy_from_user(buf, s, len)) | |
2312 | return -EFAULT; | |
2313 | buf[len] = 0; | |
2314 | p = buf; | |
2315 | if (*p == '-' && left > 1) { | |
2316 | neg = 1; | |
bd9b0bac | 2317 | p++; |
1da177e4 LT |
2318 | } |
2319 | if (*p < '0' || *p > '9') | |
2320 | break; | |
2321 | val = simple_strtoul(p, &p, 0) * convmul / convdiv ; | |
2322 | len = p-buf; | |
2323 | if ((len < left) && *p && !isspace(*p)) | |
2324 | break; | |
2325 | if (neg) | |
2326 | val = -val; | |
2327 | s += len; | |
2328 | left -= len; | |
2329 | ||
2330 | if(neg) | |
2331 | continue; | |
2332 | if ((min && val < *min) || (max && val > *max)) | |
2333 | continue; | |
2334 | *i = val; | |
2335 | } else { | |
2336 | p = buf; | |
2337 | if (!first) | |
2338 | *p++ = '\t'; | |
2339 | sprintf(p, "%lu", convdiv * (*i) / convmul); | |
2340 | len = strlen(buf); | |
2341 | if (len > left) | |
2342 | len = left; | |
2343 | if(copy_to_user(s, buf, len)) | |
2344 | return -EFAULT; | |
2345 | left -= len; | |
2346 | s += len; | |
2347 | } | |
2348 | } | |
2349 | ||
2350 | if (!write && !first && left) { | |
2351 | if(put_user('\n', s)) | |
2352 | return -EFAULT; | |
2353 | left--, s++; | |
2354 | } | |
2355 | if (write) { | |
2356 | while (left) { | |
2357 | char c; | |
2358 | if (get_user(c, s++)) | |
2359 | return -EFAULT; | |
2360 | if (!isspace(c)) | |
2361 | break; | |
2362 | left--; | |
2363 | } | |
2364 | } | |
2365 | if (write && first) | |
2366 | return -EINVAL; | |
2367 | *lenp -= left; | |
2368 | *ppos += *lenp; | |
2369 | return 0; | |
2370 | #undef TMPBUFLEN | |
2371 | } | |
2372 | ||
d8217f07 | 2373 | static int do_proc_doulongvec_minmax(struct ctl_table *table, int write, |
fcfbd547 KK |
2374 | void __user *buffer, |
2375 | size_t *lenp, loff_t *ppos, | |
2376 | unsigned long convmul, | |
2377 | unsigned long convdiv) | |
2378 | { | |
2379 | return __do_proc_doulongvec_minmax(table->data, table, write, | |
8d65af78 | 2380 | buffer, lenp, ppos, convmul, convdiv); |
fcfbd547 KK |
2381 | } |
2382 | ||
1da177e4 LT |
2383 | /** |
2384 | * proc_doulongvec_minmax - read a vector of long integers with min/max values | |
2385 | * @table: the sysctl table | |
2386 | * @write: %TRUE if this is a write to the sysctl file | |
1da177e4 LT |
2387 | * @buffer: the user buffer |
2388 | * @lenp: the size of the user buffer | |
2389 | * @ppos: file position | |
2390 | * | |
2391 | * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long | |
2392 | * values from/to the user buffer, treated as an ASCII string. | |
2393 | * | |
2394 | * This routine will ensure the values are within the range specified by | |
2395 | * table->extra1 (min) and table->extra2 (max). | |
2396 | * | |
2397 | * Returns 0 on success. | |
2398 | */ | |
8d65af78 | 2399 | int proc_doulongvec_minmax(struct ctl_table *table, int write, |
1da177e4 LT |
2400 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2401 | { | |
8d65af78 | 2402 | return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l); |
1da177e4 LT |
2403 | } |
2404 | ||
2405 | /** | |
2406 | * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values | |
2407 | * @table: the sysctl table | |
2408 | * @write: %TRUE if this is a write to the sysctl file | |
1da177e4 LT |
2409 | * @buffer: the user buffer |
2410 | * @lenp: the size of the user buffer | |
2411 | * @ppos: file position | |
2412 | * | |
2413 | * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long | |
2414 | * values from/to the user buffer, treated as an ASCII string. The values | |
2415 | * are treated as milliseconds, and converted to jiffies when they are stored. | |
2416 | * | |
2417 | * This routine will ensure the values are within the range specified by | |
2418 | * table->extra1 (min) and table->extra2 (max). | |
2419 | * | |
2420 | * Returns 0 on success. | |
2421 | */ | |
d8217f07 | 2422 | int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, |
1da177e4 LT |
2423 | void __user *buffer, |
2424 | size_t *lenp, loff_t *ppos) | |
2425 | { | |
8d65af78 | 2426 | return do_proc_doulongvec_minmax(table, write, buffer, |
1da177e4 LT |
2427 | lenp, ppos, HZ, 1000l); |
2428 | } | |
2429 | ||
2430 | ||
2431 | static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp, | |
2432 | int *valp, | |
2433 | int write, void *data) | |
2434 | { | |
2435 | if (write) { | |
cba9f33d BS |
2436 | if (*lvalp > LONG_MAX / HZ) |
2437 | return 1; | |
1da177e4 LT |
2438 | *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ); |
2439 | } else { | |
2440 | int val = *valp; | |
2441 | unsigned long lval; | |
2442 | if (val < 0) { | |
2443 | *negp = -1; | |
2444 | lval = (unsigned long)-val; | |
2445 | } else { | |
2446 | *negp = 0; | |
2447 | lval = (unsigned long)val; | |
2448 | } | |
2449 | *lvalp = lval / HZ; | |
2450 | } | |
2451 | return 0; | |
2452 | } | |
2453 | ||
2454 | static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp, | |
2455 | int *valp, | |
2456 | int write, void *data) | |
2457 | { | |
2458 | if (write) { | |
cba9f33d BS |
2459 | if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ) |
2460 | return 1; | |
1da177e4 LT |
2461 | *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp); |
2462 | } else { | |
2463 | int val = *valp; | |
2464 | unsigned long lval; | |
2465 | if (val < 0) { | |
2466 | *negp = -1; | |
2467 | lval = (unsigned long)-val; | |
2468 | } else { | |
2469 | *negp = 0; | |
2470 | lval = (unsigned long)val; | |
2471 | } | |
2472 | *lvalp = jiffies_to_clock_t(lval); | |
2473 | } | |
2474 | return 0; | |
2475 | } | |
2476 | ||
2477 | static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp, | |
2478 | int *valp, | |
2479 | int write, void *data) | |
2480 | { | |
2481 | if (write) { | |
2482 | *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp); | |
2483 | } else { | |
2484 | int val = *valp; | |
2485 | unsigned long lval; | |
2486 | if (val < 0) { | |
2487 | *negp = -1; | |
2488 | lval = (unsigned long)-val; | |
2489 | } else { | |
2490 | *negp = 0; | |
2491 | lval = (unsigned long)val; | |
2492 | } | |
2493 | *lvalp = jiffies_to_msecs(lval); | |
2494 | } | |
2495 | return 0; | |
2496 | } | |
2497 | ||
2498 | /** | |
2499 | * proc_dointvec_jiffies - read a vector of integers as seconds | |
2500 | * @table: the sysctl table | |
2501 | * @write: %TRUE if this is a write to the sysctl file | |
1da177e4 LT |
2502 | * @buffer: the user buffer |
2503 | * @lenp: the size of the user buffer | |
2504 | * @ppos: file position | |
2505 | * | |
2506 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer | |
2507 | * values from/to the user buffer, treated as an ASCII string. | |
2508 | * The values read are assumed to be in seconds, and are converted into | |
2509 | * jiffies. | |
2510 | * | |
2511 | * Returns 0 on success. | |
2512 | */ | |
8d65af78 | 2513 | int proc_dointvec_jiffies(struct ctl_table *table, int write, |
1da177e4 LT |
2514 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2515 | { | |
8d65af78 | 2516 | return do_proc_dointvec(table,write,buffer,lenp,ppos, |
1da177e4 LT |
2517 | do_proc_dointvec_jiffies_conv,NULL); |
2518 | } | |
2519 | ||
2520 | /** | |
2521 | * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds | |
2522 | * @table: the sysctl table | |
2523 | * @write: %TRUE if this is a write to the sysctl file | |
1da177e4 LT |
2524 | * @buffer: the user buffer |
2525 | * @lenp: the size of the user buffer | |
1e5d5331 | 2526 | * @ppos: pointer to the file position |
1da177e4 LT |
2527 | * |
2528 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer | |
2529 | * values from/to the user buffer, treated as an ASCII string. | |
2530 | * The values read are assumed to be in 1/USER_HZ seconds, and | |
2531 | * are converted into jiffies. | |
2532 | * | |
2533 | * Returns 0 on success. | |
2534 | */ | |
8d65af78 | 2535 | int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, |
1da177e4 LT |
2536 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2537 | { | |
8d65af78 | 2538 | return do_proc_dointvec(table,write,buffer,lenp,ppos, |
1da177e4 LT |
2539 | do_proc_dointvec_userhz_jiffies_conv,NULL); |
2540 | } | |
2541 | ||
2542 | /** | |
2543 | * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds | |
2544 | * @table: the sysctl table | |
2545 | * @write: %TRUE if this is a write to the sysctl file | |
1da177e4 LT |
2546 | * @buffer: the user buffer |
2547 | * @lenp: the size of the user buffer | |
67be2dd1 MW |
2548 | * @ppos: file position |
2549 | * @ppos: the current position in the file | |
1da177e4 LT |
2550 | * |
2551 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer | |
2552 | * values from/to the user buffer, treated as an ASCII string. | |
2553 | * The values read are assumed to be in 1/1000 seconds, and | |
2554 | * are converted into jiffies. | |
2555 | * | |
2556 | * Returns 0 on success. | |
2557 | */ | |
8d65af78 | 2558 | int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, |
1da177e4 LT |
2559 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2560 | { | |
8d65af78 | 2561 | return do_proc_dointvec(table, write, buffer, lenp, ppos, |
1da177e4 LT |
2562 | do_proc_dointvec_ms_jiffies_conv, NULL); |
2563 | } | |
2564 | ||
8d65af78 | 2565 | static int proc_do_cad_pid(struct ctl_table *table, int write, |
9ec52099 CLG |
2566 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2567 | { | |
2568 | struct pid *new_pid; | |
2569 | pid_t tmp; | |
2570 | int r; | |
2571 | ||
6c5f3e7b | 2572 | tmp = pid_vnr(cad_pid); |
9ec52099 | 2573 | |
8d65af78 | 2574 | r = __do_proc_dointvec(&tmp, table, write, buffer, |
9ec52099 CLG |
2575 | lenp, ppos, NULL, NULL); |
2576 | if (r || !write) | |
2577 | return r; | |
2578 | ||
2579 | new_pid = find_get_pid(tmp); | |
2580 | if (!new_pid) | |
2581 | return -ESRCH; | |
2582 | ||
2583 | put_pid(xchg(&cad_pid, new_pid)); | |
2584 | return 0; | |
2585 | } | |
2586 | ||
1da177e4 LT |
2587 | #else /* CONFIG_PROC_FS */ |
2588 | ||
8d65af78 | 2589 | int proc_dostring(struct ctl_table *table, int write, |
1da177e4 LT |
2590 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2591 | { | |
2592 | return -ENOSYS; | |
2593 | } | |
2594 | ||
8d65af78 | 2595 | int proc_dointvec(struct ctl_table *table, int write, |
1da177e4 | 2596 | void __user *buffer, size_t *lenp, loff_t *ppos) |
1da177e4 LT |
2597 | { |
2598 | return -ENOSYS; | |
2599 | } | |
2600 | ||
8d65af78 | 2601 | int proc_dointvec_minmax(struct ctl_table *table, int write, |
1da177e4 LT |
2602 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2603 | { | |
2604 | return -ENOSYS; | |
2605 | } | |
2606 | ||
8d65af78 | 2607 | int proc_dointvec_jiffies(struct ctl_table *table, int write, |
1da177e4 LT |
2608 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2609 | { | |
2610 | return -ENOSYS; | |
2611 | } | |
2612 | ||
8d65af78 | 2613 | int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, |
1da177e4 LT |
2614 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2615 | { | |
2616 | return -ENOSYS; | |
2617 | } | |
2618 | ||
8d65af78 | 2619 | int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, |
1da177e4 LT |
2620 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2621 | { | |
2622 | return -ENOSYS; | |
2623 | } | |
2624 | ||
8d65af78 | 2625 | int proc_doulongvec_minmax(struct ctl_table *table, int write, |
1da177e4 LT |
2626 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2627 | { | |
2628 | return -ENOSYS; | |
2629 | } | |
2630 | ||
d8217f07 | 2631 | int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, |
1da177e4 LT |
2632 | void __user *buffer, |
2633 | size_t *lenp, loff_t *ppos) | |
2634 | { | |
2635 | return -ENOSYS; | |
2636 | } | |
2637 | ||
2638 | ||
2639 | #endif /* CONFIG_PROC_FS */ | |
2640 | ||
1da177e4 LT |
2641 | /* |
2642 | * No sense putting this after each symbol definition, twice, | |
2643 | * exception granted :-) | |
2644 | */ | |
2645 | EXPORT_SYMBOL(proc_dointvec); | |
2646 | EXPORT_SYMBOL(proc_dointvec_jiffies); | |
2647 | EXPORT_SYMBOL(proc_dointvec_minmax); | |
2648 | EXPORT_SYMBOL(proc_dointvec_userhz_jiffies); | |
2649 | EXPORT_SYMBOL(proc_dointvec_ms_jiffies); | |
2650 | EXPORT_SYMBOL(proc_dostring); | |
2651 | EXPORT_SYMBOL(proc_doulongvec_minmax); | |
2652 | EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax); | |
2653 | EXPORT_SYMBOL(register_sysctl_table); | |
29e796fd | 2654 | EXPORT_SYMBOL(register_sysctl_paths); |
1da177e4 | 2655 | EXPORT_SYMBOL(unregister_sysctl_table); |