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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> | |
d33ed52d | 26 | #include <linux/signal.h> |
1da177e4 | 27 | #include <linux/proc_fs.h> |
72c2d582 | 28 | #include <linux/security.h> |
1da177e4 | 29 | #include <linux/ctype.h> |
dfec072e | 30 | #include <linux/kmemcheck.h> |
62239ac2 | 31 | #include <linux/fs.h> |
1da177e4 LT |
32 | #include <linux/init.h> |
33 | #include <linux/kernel.h> | |
0296b228 | 34 | #include <linux/kobject.h> |
20380731 | 35 | #include <linux/net.h> |
1da177e4 LT |
36 | #include <linux/sysrq.h> |
37 | #include <linux/highuid.h> | |
38 | #include <linux/writeback.h> | |
3fff4c42 | 39 | #include <linux/ratelimit.h> |
1da177e4 | 40 | #include <linux/hugetlb.h> |
1da177e4 | 41 | #include <linux/initrd.h> |
0b77f5bf | 42 | #include <linux/key.h> |
1da177e4 LT |
43 | #include <linux/times.h> |
44 | #include <linux/limits.h> | |
45 | #include <linux/dcache.h> | |
46 | #include <linux/syscalls.h> | |
c748e134 | 47 | #include <linux/vmstat.h> |
c255d844 PM |
48 | #include <linux/nfs_fs.h> |
49 | #include <linux/acpi.h> | |
10a0a8d4 | 50 | #include <linux/reboot.h> |
b0fc494f | 51 | #include <linux/ftrace.h> |
12e22c5e | 52 | #include <linux/slow-work.h> |
cdd6c482 | 53 | #include <linux/perf_event.h> |
b2be84df | 54 | #include <linux/kprobes.h> |
b492e95b | 55 | #include <linux/pipe_fs_i.h> |
1da177e4 LT |
56 | |
57 | #include <asm/uaccess.h> | |
58 | #include <asm/processor.h> | |
59 | ||
29cbc78b AK |
60 | #ifdef CONFIG_X86 |
61 | #include <asm/nmi.h> | |
0741f4d2 | 62 | #include <asm/stacktrace.h> |
6e7c4025 | 63 | #include <asm/io.h> |
29cbc78b | 64 | #endif |
c55b7c3e DY |
65 | #ifdef CONFIG_BSD_PROCESS_ACCT |
66 | #include <linux/acct.h> | |
67 | #endif | |
4f0e056f DY |
68 | #ifdef CONFIG_RT_MUTEXES |
69 | #include <linux/rtmutex.h> | |
70 | #endif | |
2edf5e49 DY |
71 | #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT) |
72 | #include <linux/lockdep.h> | |
73 | #endif | |
15485a46 DY |
74 | #ifdef CONFIG_CHR_DEV_SG |
75 | #include <scsi/sg.h> | |
76 | #endif | |
29cbc78b | 77 | |
7058cb02 | 78 | |
1da177e4 LT |
79 | #if defined(CONFIG_SYSCTL) |
80 | ||
81 | /* External variables not in a header file. */ | |
1da177e4 LT |
82 | extern int sysctl_overcommit_memory; |
83 | extern int sysctl_overcommit_ratio; | |
fadd8fbd | 84 | extern int sysctl_panic_on_oom; |
fe071d7e | 85 | extern int sysctl_oom_kill_allocating_task; |
fef1bdd6 | 86 | extern int sysctl_oom_dump_tasks; |
1da177e4 | 87 | extern int max_threads; |
1da177e4 | 88 | extern int core_uses_pid; |
d6e71144 | 89 | extern int suid_dumpable; |
1da177e4 | 90 | extern char core_pattern[]; |
a293980c | 91 | extern unsigned int core_pipe_limit; |
1da177e4 LT |
92 | extern int pid_max; |
93 | extern int min_free_kbytes; | |
1da177e4 | 94 | extern int pid_max_min, pid_max_max; |
9d0243bc | 95 | extern int sysctl_drop_caches; |
8ad4b1fb | 96 | extern int percpu_pagelist_fraction; |
bebfa101 | 97 | extern int compat_log; |
9745512c | 98 | extern int latencytop_enabled; |
eceea0b3 | 99 | extern int sysctl_nr_open_min, sysctl_nr_open_max; |
dd8632a1 PM |
100 | #ifndef CONFIG_MMU |
101 | extern int sysctl_nr_trim_pages; | |
102 | #endif | |
cb684b5b | 103 | #ifdef CONFIG_BLOCK |
5e605b64 | 104 | extern int blk_iopoll_enabled; |
cb684b5b | 105 | #endif |
1da177e4 | 106 | |
c4f3b63f | 107 | /* Constants used for minimum and maximum */ |
195cf453 | 108 | #ifdef CONFIG_DETECT_SOFTLOCKUP |
c4f3b63f | 109 | static int sixty = 60; |
9383d967 | 110 | static int neg_one = -1; |
c4f3b63f RT |
111 | #endif |
112 | ||
c4f3b63f | 113 | static int zero; |
cd5f9a4c LT |
114 | static int __maybe_unused one = 1; |
115 | static int __maybe_unused two = 2; | |
fc3501d4 | 116 | static unsigned long one_ul = 1; |
c4f3b63f | 117 | static int one_hundred = 100; |
af91322e DY |
118 | #ifdef CONFIG_PRINTK |
119 | static int ten_thousand = 10000; | |
120 | #endif | |
c4f3b63f | 121 | |
9e4a5bda AR |
122 | /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */ |
123 | static unsigned long dirty_bytes_min = 2 * PAGE_SIZE; | |
124 | ||
1da177e4 LT |
125 | /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */ |
126 | static int maxolduid = 65535; | |
127 | static int minolduid; | |
8ad4b1fb | 128 | static int min_percpu_pagelist_fract = 8; |
1da177e4 LT |
129 | |
130 | static int ngroups_max = NGROUPS_MAX; | |
131 | ||
72c57ed5 | 132 | #ifdef CONFIG_SPARC |
17f04fbb | 133 | #include <asm/system.h> |
1da177e4 LT |
134 | #endif |
135 | ||
0871420f DM |
136 | #ifdef CONFIG_SPARC64 |
137 | extern int sysctl_tsb_ratio; | |
138 | #endif | |
139 | ||
1da177e4 LT |
140 | #ifdef __hppa__ |
141 | extern int pwrsw_enabled; | |
142 | extern int unaligned_enabled; | |
143 | #endif | |
144 | ||
347a8dc3 | 145 | #ifdef CONFIG_S390 |
1da177e4 LT |
146 | #ifdef CONFIG_MATHEMU |
147 | extern int sysctl_ieee_emulation_warnings; | |
148 | #endif | |
149 | extern int sysctl_userprocess_debug; | |
951f22d5 | 150 | extern int spin_retry; |
1da177e4 LT |
151 | #endif |
152 | ||
d2b176ed JS |
153 | #ifdef CONFIG_IA64 |
154 | extern int no_unaligned_warning; | |
88fc241f | 155 | extern int unaligned_dump_stack; |
d2b176ed JS |
156 | #endif |
157 | ||
3fff4c42 IM |
158 | extern struct ratelimit_state printk_ratelimit_state; |
159 | ||
d6f8ff73 | 160 | #ifdef CONFIG_PROC_SYSCTL |
8d65af78 | 161 | static int proc_do_cad_pid(struct ctl_table *table, int write, |
9ec52099 | 162 | void __user *buffer, size_t *lenp, loff_t *ppos); |
8d65af78 | 163 | static int proc_taint(struct ctl_table *table, int write, |
34f5a398 | 164 | void __user *buffer, size_t *lenp, loff_t *ppos); |
d6f8ff73 | 165 | #endif |
9ec52099 | 166 | |
97f5f0cd DT |
167 | #ifdef CONFIG_MAGIC_SYSRQ |
168 | static int __sysrq_enabled; /* Note: sysrq code ises it's own private copy */ | |
169 | ||
170 | static int sysrq_sysctl_handler(ctl_table *table, int write, | |
171 | void __user *buffer, size_t *lenp, | |
172 | loff_t *ppos) | |
173 | { | |
174 | int error; | |
175 | ||
176 | error = proc_dointvec(table, write, buffer, lenp, ppos); | |
177 | if (error) | |
178 | return error; | |
179 | ||
180 | if (write) | |
181 | sysrq_toggle_support(__sysrq_enabled); | |
182 | ||
183 | return 0; | |
184 | } | |
185 | ||
186 | #endif | |
187 | ||
d8217f07 | 188 | static struct ctl_table root_table[]; |
e51b6ba0 EB |
189 | static struct ctl_table_root sysctl_table_root; |
190 | static struct ctl_table_header root_table_header = { | |
b380b0d4 | 191 | .count = 1, |
e51b6ba0 | 192 | .ctl_table = root_table, |
73455092 | 193 | .ctl_entry = LIST_HEAD_INIT(sysctl_table_root.default_set.list), |
e51b6ba0 | 194 | .root = &sysctl_table_root, |
73455092 | 195 | .set = &sysctl_table_root.default_set, |
e51b6ba0 EB |
196 | }; |
197 | static struct ctl_table_root sysctl_table_root = { | |
198 | .root_list = LIST_HEAD_INIT(sysctl_table_root.root_list), | |
73455092 | 199 | .default_set.list = LIST_HEAD_INIT(root_table_header.ctl_entry), |
e51b6ba0 | 200 | }; |
1da177e4 | 201 | |
d8217f07 EB |
202 | static struct ctl_table kern_table[]; |
203 | static struct ctl_table vm_table[]; | |
204 | static struct ctl_table fs_table[]; | |
205 | static struct ctl_table debug_table[]; | |
206 | static struct ctl_table dev_table[]; | |
207 | extern struct ctl_table random_table[]; | |
2d9048e2 | 208 | #ifdef CONFIG_INOTIFY_USER |
d8217f07 | 209 | extern struct ctl_table inotify_table[]; |
0399cb08 | 210 | #endif |
7ef9964e DL |
211 | #ifdef CONFIG_EPOLL |
212 | extern struct ctl_table epoll_table[]; | |
213 | #endif | |
1da177e4 LT |
214 | |
215 | #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT | |
216 | int sysctl_legacy_va_layout; | |
217 | #endif | |
218 | ||
1da177e4 LT |
219 | /* The default sysctl tables: */ |
220 | ||
d8217f07 | 221 | static struct ctl_table root_table[] = { |
1da177e4 | 222 | { |
1da177e4 LT |
223 | .procname = "kernel", |
224 | .mode = 0555, | |
225 | .child = kern_table, | |
226 | }, | |
227 | { | |
1da177e4 LT |
228 | .procname = "vm", |
229 | .mode = 0555, | |
230 | .child = vm_table, | |
231 | }, | |
1da177e4 | 232 | { |
1da177e4 LT |
233 | .procname = "fs", |
234 | .mode = 0555, | |
235 | .child = fs_table, | |
236 | }, | |
237 | { | |
1da177e4 LT |
238 | .procname = "debug", |
239 | .mode = 0555, | |
240 | .child = debug_table, | |
241 | }, | |
242 | { | |
1da177e4 LT |
243 | .procname = "dev", |
244 | .mode = 0555, | |
245 | .child = dev_table, | |
246 | }, | |
2be7fe07 AM |
247 | /* |
248 | * NOTE: do not add new entries to this table unless you have read | |
249 | * Documentation/sysctl/ctl_unnumbered.txt | |
250 | */ | |
6fce56ec | 251 | { } |
1da177e4 LT |
252 | }; |
253 | ||
77e54a1f | 254 | #ifdef CONFIG_SCHED_DEBUG |
73c4efd2 ED |
255 | static int min_sched_granularity_ns = 100000; /* 100 usecs */ |
256 | static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */ | |
257 | static int min_wakeup_granularity_ns; /* 0 usecs */ | |
258 | static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */ | |
1983a922 CE |
259 | static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE; |
260 | static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1; | |
acb4a848 CE |
261 | static int min_sched_shares_ratelimit = 100000; /* 100 usec */ |
262 | static int max_sched_shares_ratelimit = NSEC_PER_SEC; /* 1 second */ | |
77e54a1f IM |
263 | #endif |
264 | ||
d8217f07 | 265 | static struct ctl_table kern_table[] = { |
2bba22c5 | 266 | { |
2bba22c5 MG |
267 | .procname = "sched_child_runs_first", |
268 | .data = &sysctl_sched_child_runs_first, | |
269 | .maxlen = sizeof(unsigned int), | |
270 | .mode = 0644, | |
6d456111 | 271 | .proc_handler = proc_dointvec, |
2bba22c5 | 272 | }, |
77e54a1f IM |
273 | #ifdef CONFIG_SCHED_DEBUG |
274 | { | |
b2be5e96 PZ |
275 | .procname = "sched_min_granularity_ns", |
276 | .data = &sysctl_sched_min_granularity, | |
77e54a1f IM |
277 | .maxlen = sizeof(unsigned int), |
278 | .mode = 0644, | |
702a7c76 | 279 | .proc_handler = sched_proc_update_handler, |
b2be5e96 PZ |
280 | .extra1 = &min_sched_granularity_ns, |
281 | .extra2 = &max_sched_granularity_ns, | |
77e54a1f | 282 | }, |
21805085 | 283 | { |
21805085 PZ |
284 | .procname = "sched_latency_ns", |
285 | .data = &sysctl_sched_latency, | |
286 | .maxlen = sizeof(unsigned int), | |
287 | .mode = 0644, | |
702a7c76 | 288 | .proc_handler = sched_proc_update_handler, |
21805085 PZ |
289 | .extra1 = &min_sched_granularity_ns, |
290 | .extra2 = &max_sched_granularity_ns, | |
291 | }, | |
77e54a1f | 292 | { |
77e54a1f IM |
293 | .procname = "sched_wakeup_granularity_ns", |
294 | .data = &sysctl_sched_wakeup_granularity, | |
295 | .maxlen = sizeof(unsigned int), | |
296 | .mode = 0644, | |
702a7c76 | 297 | .proc_handler = sched_proc_update_handler, |
77e54a1f IM |
298 | .extra1 = &min_wakeup_granularity_ns, |
299 | .extra2 = &max_wakeup_granularity_ns, | |
300 | }, | |
2398f2c6 | 301 | { |
2398f2c6 PZ |
302 | .procname = "sched_shares_ratelimit", |
303 | .data = &sysctl_sched_shares_ratelimit, | |
304 | .maxlen = sizeof(unsigned int), | |
305 | .mode = 0644, | |
702a7c76 | 306 | .proc_handler = sched_proc_update_handler, |
acb4a848 CE |
307 | .extra1 = &min_sched_shares_ratelimit, |
308 | .extra2 = &max_sched_shares_ratelimit, | |
2398f2c6 | 309 | }, |
1983a922 | 310 | { |
1983a922 CE |
311 | .procname = "sched_tunable_scaling", |
312 | .data = &sysctl_sched_tunable_scaling, | |
313 | .maxlen = sizeof(enum sched_tunable_scaling), | |
314 | .mode = 0644, | |
702a7c76 | 315 | .proc_handler = sched_proc_update_handler, |
1983a922 CE |
316 | .extra1 = &min_sched_tunable_scaling, |
317 | .extra2 = &max_sched_tunable_scaling, | |
2398f2c6 | 318 | }, |
ffda12a1 | 319 | { |
ffda12a1 PZ |
320 | .procname = "sched_shares_thresh", |
321 | .data = &sysctl_sched_shares_thresh, | |
322 | .maxlen = sizeof(unsigned int), | |
323 | .mode = 0644, | |
6d456111 | 324 | .proc_handler = proc_dointvec_minmax, |
ffda12a1 PZ |
325 | .extra1 = &zero, |
326 | }, | |
da84d961 | 327 | { |
da84d961 IM |
328 | .procname = "sched_migration_cost", |
329 | .data = &sysctl_sched_migration_cost, | |
330 | .maxlen = sizeof(unsigned int), | |
331 | .mode = 0644, | |
6d456111 | 332 | .proc_handler = proc_dointvec, |
da84d961 | 333 | }, |
b82d9fdd | 334 | { |
b82d9fdd PZ |
335 | .procname = "sched_nr_migrate", |
336 | .data = &sysctl_sched_nr_migrate, | |
337 | .maxlen = sizeof(unsigned int), | |
fa85ae24 | 338 | .mode = 0644, |
6d456111 | 339 | .proc_handler = proc_dointvec, |
fa85ae24 | 340 | }, |
e9e9250b | 341 | { |
e9e9250b PZ |
342 | .procname = "sched_time_avg", |
343 | .data = &sysctl_sched_time_avg, | |
344 | .maxlen = sizeof(unsigned int), | |
345 | .mode = 0644, | |
6d456111 | 346 | .proc_handler = proc_dointvec, |
e9e9250b | 347 | }, |
cd1bb94b | 348 | { |
cd1bb94b AB |
349 | .procname = "timer_migration", |
350 | .data = &sysctl_timer_migration, | |
351 | .maxlen = sizeof(unsigned int), | |
352 | .mode = 0644, | |
6d456111 | 353 | .proc_handler = proc_dointvec_minmax, |
bfdb4d9f AB |
354 | .extra1 = &zero, |
355 | .extra2 = &one, | |
fa85ae24 | 356 | }, |
1fc84aaa | 357 | #endif |
9f0c1e56 | 358 | { |
9f0c1e56 PZ |
359 | .procname = "sched_rt_period_us", |
360 | .data = &sysctl_sched_rt_period, | |
361 | .maxlen = sizeof(unsigned int), | |
362 | .mode = 0644, | |
6d456111 | 363 | .proc_handler = sched_rt_handler, |
9f0c1e56 PZ |
364 | }, |
365 | { | |
9f0c1e56 PZ |
366 | .procname = "sched_rt_runtime_us", |
367 | .data = &sysctl_sched_rt_runtime, | |
368 | .maxlen = sizeof(int), | |
369 | .mode = 0644, | |
6d456111 | 370 | .proc_handler = sched_rt_handler, |
9f0c1e56 | 371 | }, |
1799e35d | 372 | { |
1799e35d IM |
373 | .procname = "sched_compat_yield", |
374 | .data = &sysctl_sched_compat_yield, | |
375 | .maxlen = sizeof(unsigned int), | |
376 | .mode = 0644, | |
6d456111 | 377 | .proc_handler = proc_dointvec, |
1799e35d | 378 | }, |
f20786ff PZ |
379 | #ifdef CONFIG_PROVE_LOCKING |
380 | { | |
f20786ff PZ |
381 | .procname = "prove_locking", |
382 | .data = &prove_locking, | |
383 | .maxlen = sizeof(int), | |
384 | .mode = 0644, | |
6d456111 | 385 | .proc_handler = proc_dointvec, |
f20786ff PZ |
386 | }, |
387 | #endif | |
388 | #ifdef CONFIG_LOCK_STAT | |
389 | { | |
f20786ff PZ |
390 | .procname = "lock_stat", |
391 | .data = &lock_stat, | |
392 | .maxlen = sizeof(int), | |
393 | .mode = 0644, | |
6d456111 | 394 | .proc_handler = proc_dointvec, |
f20786ff | 395 | }, |
77e54a1f | 396 | #endif |
1da177e4 | 397 | { |
1da177e4 LT |
398 | .procname = "panic", |
399 | .data = &panic_timeout, | |
400 | .maxlen = sizeof(int), | |
401 | .mode = 0644, | |
6d456111 | 402 | .proc_handler = proc_dointvec, |
1da177e4 LT |
403 | }, |
404 | { | |
1da177e4 LT |
405 | .procname = "core_uses_pid", |
406 | .data = &core_uses_pid, | |
407 | .maxlen = sizeof(int), | |
408 | .mode = 0644, | |
6d456111 | 409 | .proc_handler = proc_dointvec, |
1da177e4 LT |
410 | }, |
411 | { | |
1da177e4 LT |
412 | .procname = "core_pattern", |
413 | .data = core_pattern, | |
71ce92f3 | 414 | .maxlen = CORENAME_MAX_SIZE, |
1da177e4 | 415 | .mode = 0644, |
6d456111 | 416 | .proc_handler = proc_dostring, |
1da177e4 | 417 | }, |
a293980c | 418 | { |
a293980c NH |
419 | .procname = "core_pipe_limit", |
420 | .data = &core_pipe_limit, | |
421 | .maxlen = sizeof(unsigned int), | |
422 | .mode = 0644, | |
6d456111 | 423 | .proc_handler = proc_dointvec, |
a293980c | 424 | }, |
34f5a398 | 425 | #ifdef CONFIG_PROC_SYSCTL |
1da177e4 | 426 | { |
1da177e4 | 427 | .procname = "tainted", |
25ddbb18 | 428 | .maxlen = sizeof(long), |
34f5a398 | 429 | .mode = 0644, |
6d456111 | 430 | .proc_handler = proc_taint, |
1da177e4 | 431 | }, |
34f5a398 | 432 | #endif |
9745512c AV |
433 | #ifdef CONFIG_LATENCYTOP |
434 | { | |
435 | .procname = "latencytop", | |
436 | .data = &latencytop_enabled, | |
437 | .maxlen = sizeof(int), | |
438 | .mode = 0644, | |
6d456111 | 439 | .proc_handler = proc_dointvec, |
9745512c AV |
440 | }, |
441 | #endif | |
1da177e4 LT |
442 | #ifdef CONFIG_BLK_DEV_INITRD |
443 | { | |
1da177e4 LT |
444 | .procname = "real-root-dev", |
445 | .data = &real_root_dev, | |
446 | .maxlen = sizeof(int), | |
447 | .mode = 0644, | |
6d456111 | 448 | .proc_handler = proc_dointvec, |
1da177e4 LT |
449 | }, |
450 | #endif | |
45807a1d | 451 | { |
45807a1d IM |
452 | .procname = "print-fatal-signals", |
453 | .data = &print_fatal_signals, | |
454 | .maxlen = sizeof(int), | |
455 | .mode = 0644, | |
6d456111 | 456 | .proc_handler = proc_dointvec, |
45807a1d | 457 | }, |
72c57ed5 | 458 | #ifdef CONFIG_SPARC |
1da177e4 | 459 | { |
1da177e4 LT |
460 | .procname = "reboot-cmd", |
461 | .data = reboot_command, | |
462 | .maxlen = 256, | |
463 | .mode = 0644, | |
6d456111 | 464 | .proc_handler = proc_dostring, |
1da177e4 LT |
465 | }, |
466 | { | |
1da177e4 LT |
467 | .procname = "stop-a", |
468 | .data = &stop_a_enabled, | |
469 | .maxlen = sizeof (int), | |
470 | .mode = 0644, | |
6d456111 | 471 | .proc_handler = proc_dointvec, |
1da177e4 LT |
472 | }, |
473 | { | |
1da177e4 LT |
474 | .procname = "scons-poweroff", |
475 | .data = &scons_pwroff, | |
476 | .maxlen = sizeof (int), | |
477 | .mode = 0644, | |
6d456111 | 478 | .proc_handler = proc_dointvec, |
1da177e4 LT |
479 | }, |
480 | #endif | |
0871420f DM |
481 | #ifdef CONFIG_SPARC64 |
482 | { | |
0871420f DM |
483 | .procname = "tsb-ratio", |
484 | .data = &sysctl_tsb_ratio, | |
485 | .maxlen = sizeof (int), | |
486 | .mode = 0644, | |
6d456111 | 487 | .proc_handler = proc_dointvec, |
0871420f DM |
488 | }, |
489 | #endif | |
1da177e4 LT |
490 | #ifdef __hppa__ |
491 | { | |
1da177e4 LT |
492 | .procname = "soft-power", |
493 | .data = &pwrsw_enabled, | |
494 | .maxlen = sizeof (int), | |
495 | .mode = 0644, | |
6d456111 | 496 | .proc_handler = proc_dointvec, |
1da177e4 LT |
497 | }, |
498 | { | |
1da177e4 LT |
499 | .procname = "unaligned-trap", |
500 | .data = &unaligned_enabled, | |
501 | .maxlen = sizeof (int), | |
502 | .mode = 0644, | |
6d456111 | 503 | .proc_handler = proc_dointvec, |
1da177e4 LT |
504 | }, |
505 | #endif | |
506 | { | |
1da177e4 LT |
507 | .procname = "ctrl-alt-del", |
508 | .data = &C_A_D, | |
509 | .maxlen = sizeof(int), | |
510 | .mode = 0644, | |
6d456111 | 511 | .proc_handler = proc_dointvec, |
1da177e4 | 512 | }, |
606576ce | 513 | #ifdef CONFIG_FUNCTION_TRACER |
b0fc494f | 514 | { |
b0fc494f SR |
515 | .procname = "ftrace_enabled", |
516 | .data = &ftrace_enabled, | |
517 | .maxlen = sizeof(int), | |
518 | .mode = 0644, | |
6d456111 | 519 | .proc_handler = ftrace_enable_sysctl, |
b0fc494f SR |
520 | }, |
521 | #endif | |
f38f1d2a SR |
522 | #ifdef CONFIG_STACK_TRACER |
523 | { | |
f38f1d2a SR |
524 | .procname = "stack_tracer_enabled", |
525 | .data = &stack_tracer_enabled, | |
526 | .maxlen = sizeof(int), | |
527 | .mode = 0644, | |
6d456111 | 528 | .proc_handler = stack_trace_sysctl, |
f38f1d2a SR |
529 | }, |
530 | #endif | |
944ac425 SR |
531 | #ifdef CONFIG_TRACING |
532 | { | |
3299b4dd | 533 | .procname = "ftrace_dump_on_oops", |
944ac425 SR |
534 | .data = &ftrace_dump_on_oops, |
535 | .maxlen = sizeof(int), | |
536 | .mode = 0644, | |
6d456111 | 537 | .proc_handler = proc_dointvec, |
944ac425 SR |
538 | }, |
539 | #endif | |
a1ef5adb | 540 | #ifdef CONFIG_MODULES |
1da177e4 | 541 | { |
1da177e4 LT |
542 | .procname = "modprobe", |
543 | .data = &modprobe_path, | |
544 | .maxlen = KMOD_PATH_LEN, | |
545 | .mode = 0644, | |
6d456111 | 546 | .proc_handler = proc_dostring, |
1da177e4 | 547 | }, |
3d43321b | 548 | { |
3d43321b KC |
549 | .procname = "modules_disabled", |
550 | .data = &modules_disabled, | |
551 | .maxlen = sizeof(int), | |
552 | .mode = 0644, | |
553 | /* only handle a transition from default "0" to "1" */ | |
6d456111 | 554 | .proc_handler = proc_dointvec_minmax, |
3d43321b KC |
555 | .extra1 = &one, |
556 | .extra2 = &one, | |
557 | }, | |
1da177e4 | 558 | #endif |
57ae2508 | 559 | #if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET) |
1da177e4 | 560 | { |
1da177e4 | 561 | .procname = "hotplug", |
312c004d KS |
562 | .data = &uevent_helper, |
563 | .maxlen = UEVENT_HELPER_PATH_LEN, | |
1da177e4 | 564 | .mode = 0644, |
6d456111 | 565 | .proc_handler = proc_dostring, |
1da177e4 LT |
566 | }, |
567 | #endif | |
568 | #ifdef CONFIG_CHR_DEV_SG | |
569 | { | |
1da177e4 LT |
570 | .procname = "sg-big-buff", |
571 | .data = &sg_big_buff, | |
572 | .maxlen = sizeof (int), | |
573 | .mode = 0444, | |
6d456111 | 574 | .proc_handler = proc_dointvec, |
1da177e4 LT |
575 | }, |
576 | #endif | |
577 | #ifdef CONFIG_BSD_PROCESS_ACCT | |
578 | { | |
1da177e4 LT |
579 | .procname = "acct", |
580 | .data = &acct_parm, | |
581 | .maxlen = 3*sizeof(int), | |
582 | .mode = 0644, | |
6d456111 | 583 | .proc_handler = proc_dointvec, |
1da177e4 LT |
584 | }, |
585 | #endif | |
1da177e4 LT |
586 | #ifdef CONFIG_MAGIC_SYSRQ |
587 | { | |
1da177e4 | 588 | .procname = "sysrq", |
5d6f647f | 589 | .data = &__sysrq_enabled, |
1da177e4 LT |
590 | .maxlen = sizeof (int), |
591 | .mode = 0644, | |
97f5f0cd | 592 | .proc_handler = sysrq_sysctl_handler, |
1da177e4 LT |
593 | }, |
594 | #endif | |
d6f8ff73 | 595 | #ifdef CONFIG_PROC_SYSCTL |
1da177e4 | 596 | { |
1da177e4 | 597 | .procname = "cad_pid", |
9ec52099 | 598 | .data = NULL, |
1da177e4 LT |
599 | .maxlen = sizeof (int), |
600 | .mode = 0600, | |
6d456111 | 601 | .proc_handler = proc_do_cad_pid, |
1da177e4 | 602 | }, |
d6f8ff73 | 603 | #endif |
1da177e4 | 604 | { |
1da177e4 LT |
605 | .procname = "threads-max", |
606 | .data = &max_threads, | |
607 | .maxlen = sizeof(int), | |
608 | .mode = 0644, | |
6d456111 | 609 | .proc_handler = proc_dointvec, |
1da177e4 LT |
610 | }, |
611 | { | |
1da177e4 LT |
612 | .procname = "random", |
613 | .mode = 0555, | |
614 | .child = random_table, | |
615 | }, | |
1da177e4 | 616 | { |
1da177e4 LT |
617 | .procname = "overflowuid", |
618 | .data = &overflowuid, | |
619 | .maxlen = sizeof(int), | |
620 | .mode = 0644, | |
6d456111 | 621 | .proc_handler = proc_dointvec_minmax, |
1da177e4 LT |
622 | .extra1 = &minolduid, |
623 | .extra2 = &maxolduid, | |
624 | }, | |
625 | { | |
1da177e4 LT |
626 | .procname = "overflowgid", |
627 | .data = &overflowgid, | |
628 | .maxlen = sizeof(int), | |
629 | .mode = 0644, | |
6d456111 | 630 | .proc_handler = proc_dointvec_minmax, |
1da177e4 LT |
631 | .extra1 = &minolduid, |
632 | .extra2 = &maxolduid, | |
633 | }, | |
347a8dc3 | 634 | #ifdef CONFIG_S390 |
1da177e4 LT |
635 | #ifdef CONFIG_MATHEMU |
636 | { | |
1da177e4 LT |
637 | .procname = "ieee_emulation_warnings", |
638 | .data = &sysctl_ieee_emulation_warnings, | |
639 | .maxlen = sizeof(int), | |
640 | .mode = 0644, | |
6d456111 | 641 | .proc_handler = proc_dointvec, |
1da177e4 | 642 | }, |
1da177e4 LT |
643 | #endif |
644 | { | |
1da177e4 | 645 | .procname = "userprocess_debug", |
ab3c68ee | 646 | .data = &show_unhandled_signals, |
1da177e4 LT |
647 | .maxlen = sizeof(int), |
648 | .mode = 0644, | |
6d456111 | 649 | .proc_handler = proc_dointvec, |
1da177e4 LT |
650 | }, |
651 | #endif | |
652 | { | |
1da177e4 LT |
653 | .procname = "pid_max", |
654 | .data = &pid_max, | |
655 | .maxlen = sizeof (int), | |
656 | .mode = 0644, | |
6d456111 | 657 | .proc_handler = proc_dointvec_minmax, |
1da177e4 LT |
658 | .extra1 = &pid_max_min, |
659 | .extra2 = &pid_max_max, | |
660 | }, | |
661 | { | |
1da177e4 LT |
662 | .procname = "panic_on_oops", |
663 | .data = &panic_on_oops, | |
664 | .maxlen = sizeof(int), | |
665 | .mode = 0644, | |
6d456111 | 666 | .proc_handler = proc_dointvec, |
1da177e4 | 667 | }, |
7ef3d2fd JP |
668 | #if defined CONFIG_PRINTK |
669 | { | |
7ef3d2fd JP |
670 | .procname = "printk", |
671 | .data = &console_loglevel, | |
672 | .maxlen = 4*sizeof(int), | |
673 | .mode = 0644, | |
6d456111 | 674 | .proc_handler = proc_dointvec, |
7ef3d2fd | 675 | }, |
1da177e4 | 676 | { |
1da177e4 | 677 | .procname = "printk_ratelimit", |
717115e1 | 678 | .data = &printk_ratelimit_state.interval, |
1da177e4 LT |
679 | .maxlen = sizeof(int), |
680 | .mode = 0644, | |
6d456111 | 681 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
682 | }, |
683 | { | |
1da177e4 | 684 | .procname = "printk_ratelimit_burst", |
717115e1 | 685 | .data = &printk_ratelimit_state.burst, |
1da177e4 LT |
686 | .maxlen = sizeof(int), |
687 | .mode = 0644, | |
6d456111 | 688 | .proc_handler = proc_dointvec, |
1da177e4 | 689 | }, |
af91322e | 690 | { |
af91322e DY |
691 | .procname = "printk_delay", |
692 | .data = &printk_delay_msec, | |
693 | .maxlen = sizeof(int), | |
694 | .mode = 0644, | |
6d456111 | 695 | .proc_handler = proc_dointvec_minmax, |
af91322e DY |
696 | .extra1 = &zero, |
697 | .extra2 = &ten_thousand, | |
698 | }, | |
7ef3d2fd | 699 | #endif |
1da177e4 | 700 | { |
1da177e4 LT |
701 | .procname = "ngroups_max", |
702 | .data = &ngroups_max, | |
703 | .maxlen = sizeof (int), | |
704 | .mode = 0444, | |
6d456111 | 705 | .proc_handler = proc_dointvec, |
1da177e4 LT |
706 | }, |
707 | #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86) | |
708 | { | |
1da177e4 LT |
709 | .procname = "unknown_nmi_panic", |
710 | .data = &unknown_nmi_panic, | |
711 | .maxlen = sizeof (int), | |
712 | .mode = 0644, | |
6d456111 | 713 | .proc_handler = proc_dointvec, |
1da177e4 | 714 | }, |
407984f1 | 715 | { |
407984f1 DZ |
716 | .procname = "nmi_watchdog", |
717 | .data = &nmi_watchdog_enabled, | |
718 | .maxlen = sizeof (int), | |
719 | .mode = 0644, | |
6d456111 | 720 | .proc_handler = proc_nmi_enabled, |
1da177e4 LT |
721 | }, |
722 | #endif | |
723 | #if defined(CONFIG_X86) | |
8da5adda | 724 | { |
8da5adda DZ |
725 | .procname = "panic_on_unrecovered_nmi", |
726 | .data = &panic_on_unrecovered_nmi, | |
727 | .maxlen = sizeof(int), | |
728 | .mode = 0644, | |
6d456111 | 729 | .proc_handler = proc_dointvec, |
8da5adda | 730 | }, |
5211a242 | 731 | { |
5211a242 KG |
732 | .procname = "panic_on_io_nmi", |
733 | .data = &panic_on_io_nmi, | |
734 | .maxlen = sizeof(int), | |
735 | .mode = 0644, | |
6d456111 | 736 | .proc_handler = proc_dointvec, |
5211a242 | 737 | }, |
1da177e4 | 738 | { |
1da177e4 LT |
739 | .procname = "bootloader_type", |
740 | .data = &bootloader_type, | |
741 | .maxlen = sizeof (int), | |
742 | .mode = 0444, | |
6d456111 | 743 | .proc_handler = proc_dointvec, |
1da177e4 | 744 | }, |
5031296c | 745 | { |
5031296c PA |
746 | .procname = "bootloader_version", |
747 | .data = &bootloader_version, | |
748 | .maxlen = sizeof (int), | |
749 | .mode = 0444, | |
6d456111 | 750 | .proc_handler = proc_dointvec, |
5031296c | 751 | }, |
0741f4d2 | 752 | { |
0741f4d2 CE |
753 | .procname = "kstack_depth_to_print", |
754 | .data = &kstack_depth_to_print, | |
755 | .maxlen = sizeof(int), | |
756 | .mode = 0644, | |
6d456111 | 757 | .proc_handler = proc_dointvec, |
0741f4d2 | 758 | }, |
6e7c4025 | 759 | { |
6e7c4025 IM |
760 | .procname = "io_delay_type", |
761 | .data = &io_delay_type, | |
762 | .maxlen = sizeof(int), | |
763 | .mode = 0644, | |
6d456111 | 764 | .proc_handler = proc_dointvec, |
6e7c4025 | 765 | }, |
1da177e4 | 766 | #endif |
7a9166e3 | 767 | #if defined(CONFIG_MMU) |
1da177e4 | 768 | { |
1da177e4 LT |
769 | .procname = "randomize_va_space", |
770 | .data = &randomize_va_space, | |
771 | .maxlen = sizeof(int), | |
772 | .mode = 0644, | |
6d456111 | 773 | .proc_handler = proc_dointvec, |
1da177e4 | 774 | }, |
7a9166e3 | 775 | #endif |
0152fb37 | 776 | #if defined(CONFIG_S390) && defined(CONFIG_SMP) |
951f22d5 | 777 | { |
951f22d5 MS |
778 | .procname = "spin_retry", |
779 | .data = &spin_retry, | |
780 | .maxlen = sizeof (int), | |
781 | .mode = 0644, | |
6d456111 | 782 | .proc_handler = proc_dointvec, |
951f22d5 | 783 | }, |
c255d844 | 784 | #endif |
673d5b43 | 785 | #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86) |
c255d844 | 786 | { |
c255d844 | 787 | .procname = "acpi_video_flags", |
77afcf78 | 788 | .data = &acpi_realmode_flags, |
c255d844 PM |
789 | .maxlen = sizeof (unsigned long), |
790 | .mode = 0644, | |
6d456111 | 791 | .proc_handler = proc_doulongvec_minmax, |
c255d844 | 792 | }, |
d2b176ed JS |
793 | #endif |
794 | #ifdef CONFIG_IA64 | |
795 | { | |
d2b176ed JS |
796 | .procname = "ignore-unaligned-usertrap", |
797 | .data = &no_unaligned_warning, | |
798 | .maxlen = sizeof (int), | |
799 | .mode = 0644, | |
6d456111 | 800 | .proc_handler = proc_dointvec, |
d2b176ed | 801 | }, |
88fc241f | 802 | { |
88fc241f DC |
803 | .procname = "unaligned-dump-stack", |
804 | .data = &unaligned_dump_stack, | |
805 | .maxlen = sizeof (int), | |
806 | .mode = 0644, | |
6d456111 | 807 | .proc_handler = proc_dointvec, |
88fc241f | 808 | }, |
bebfa101 | 809 | #endif |
c4f3b63f | 810 | #ifdef CONFIG_DETECT_SOFTLOCKUP |
9c44bc03 | 811 | { |
9c44bc03 IM |
812 | .procname = "softlockup_panic", |
813 | .data = &softlockup_panic, | |
814 | .maxlen = sizeof(int), | |
815 | .mode = 0644, | |
6d456111 | 816 | .proc_handler = proc_dointvec_minmax, |
9c44bc03 IM |
817 | .extra1 = &zero, |
818 | .extra2 = &one, | |
819 | }, | |
c4f3b63f | 820 | { |
c4f3b63f RT |
821 | .procname = "softlockup_thresh", |
822 | .data = &softlockup_thresh, | |
9383d967 | 823 | .maxlen = sizeof(int), |
c4f3b63f | 824 | .mode = 0644, |
6d456111 | 825 | .proc_handler = proc_dosoftlockup_thresh, |
9383d967 | 826 | .extra1 = &neg_one, |
c4f3b63f RT |
827 | .extra2 = &sixty, |
828 | }, | |
e162b39a MSB |
829 | #endif |
830 | #ifdef CONFIG_DETECT_HUNG_TASK | |
831 | { | |
e162b39a MSB |
832 | .procname = "hung_task_panic", |
833 | .data = &sysctl_hung_task_panic, | |
834 | .maxlen = sizeof(int), | |
835 | .mode = 0644, | |
6d456111 | 836 | .proc_handler = proc_dointvec_minmax, |
e162b39a MSB |
837 | .extra1 = &zero, |
838 | .extra2 = &one, | |
839 | }, | |
82a1fcb9 | 840 | { |
82a1fcb9 IM |
841 | .procname = "hung_task_check_count", |
842 | .data = &sysctl_hung_task_check_count, | |
90739081 | 843 | .maxlen = sizeof(unsigned long), |
82a1fcb9 | 844 | .mode = 0644, |
6d456111 | 845 | .proc_handler = proc_doulongvec_minmax, |
82a1fcb9 IM |
846 | }, |
847 | { | |
82a1fcb9 IM |
848 | .procname = "hung_task_timeout_secs", |
849 | .data = &sysctl_hung_task_timeout_secs, | |
90739081 | 850 | .maxlen = sizeof(unsigned long), |
82a1fcb9 | 851 | .mode = 0644, |
6d456111 | 852 | .proc_handler = proc_dohung_task_timeout_secs, |
82a1fcb9 IM |
853 | }, |
854 | { | |
82a1fcb9 IM |
855 | .procname = "hung_task_warnings", |
856 | .data = &sysctl_hung_task_warnings, | |
90739081 | 857 | .maxlen = sizeof(unsigned long), |
82a1fcb9 | 858 | .mode = 0644, |
6d456111 | 859 | .proc_handler = proc_doulongvec_minmax, |
82a1fcb9 | 860 | }, |
c4f3b63f | 861 | #endif |
bebfa101 AK |
862 | #ifdef CONFIG_COMPAT |
863 | { | |
bebfa101 AK |
864 | .procname = "compat-log", |
865 | .data = &compat_log, | |
866 | .maxlen = sizeof (int), | |
867 | .mode = 0644, | |
6d456111 | 868 | .proc_handler = proc_dointvec, |
bebfa101 | 869 | }, |
951f22d5 | 870 | #endif |
23f78d4a IM |
871 | #ifdef CONFIG_RT_MUTEXES |
872 | { | |
23f78d4a IM |
873 | .procname = "max_lock_depth", |
874 | .data = &max_lock_depth, | |
875 | .maxlen = sizeof(int), | |
876 | .mode = 0644, | |
6d456111 | 877 | .proc_handler = proc_dointvec, |
23f78d4a | 878 | }, |
5096add8 | 879 | #endif |
10a0a8d4 | 880 | { |
10a0a8d4 JF |
881 | .procname = "poweroff_cmd", |
882 | .data = &poweroff_cmd, | |
883 | .maxlen = POWEROFF_CMD_PATH_LEN, | |
884 | .mode = 0644, | |
6d456111 | 885 | .proc_handler = proc_dostring, |
10a0a8d4 | 886 | }, |
0b77f5bf DH |
887 | #ifdef CONFIG_KEYS |
888 | { | |
0b77f5bf DH |
889 | .procname = "keys", |
890 | .mode = 0555, | |
891 | .child = key_sysctls, | |
892 | }, | |
893 | #endif | |
31a72bce PM |
894 | #ifdef CONFIG_RCU_TORTURE_TEST |
895 | { | |
31a72bce PM |
896 | .procname = "rcutorture_runnable", |
897 | .data = &rcutorture_runnable, | |
898 | .maxlen = sizeof(int), | |
899 | .mode = 0644, | |
6d456111 | 900 | .proc_handler = proc_dointvec, |
31a72bce PM |
901 | }, |
902 | #endif | |
12e22c5e DH |
903 | #ifdef CONFIG_SLOW_WORK |
904 | { | |
12e22c5e DH |
905 | .procname = "slow-work", |
906 | .mode = 0555, | |
907 | .child = slow_work_sysctls, | |
908 | }, | |
909 | #endif | |
cdd6c482 | 910 | #ifdef CONFIG_PERF_EVENTS |
1ccd1549 | 911 | { |
cdd6c482 IM |
912 | .procname = "perf_event_paranoid", |
913 | .data = &sysctl_perf_event_paranoid, | |
914 | .maxlen = sizeof(sysctl_perf_event_paranoid), | |
1ccd1549 | 915 | .mode = 0644, |
6d456111 | 916 | .proc_handler = proc_dointvec, |
1ccd1549 | 917 | }, |
c5078f78 | 918 | { |
cdd6c482 IM |
919 | .procname = "perf_event_mlock_kb", |
920 | .data = &sysctl_perf_event_mlock, | |
921 | .maxlen = sizeof(sysctl_perf_event_mlock), | |
c5078f78 | 922 | .mode = 0644, |
6d456111 | 923 | .proc_handler = proc_dointvec, |
c5078f78 | 924 | }, |
a78ac325 | 925 | { |
cdd6c482 IM |
926 | .procname = "perf_event_max_sample_rate", |
927 | .data = &sysctl_perf_event_sample_rate, | |
928 | .maxlen = sizeof(sysctl_perf_event_sample_rate), | |
a78ac325 | 929 | .mode = 0644, |
6d456111 | 930 | .proc_handler = proc_dointvec, |
a78ac325 | 931 | }, |
1ccd1549 | 932 | #endif |
dfec072e VN |
933 | #ifdef CONFIG_KMEMCHECK |
934 | { | |
dfec072e VN |
935 | .procname = "kmemcheck", |
936 | .data = &kmemcheck_enabled, | |
937 | .maxlen = sizeof(int), | |
938 | .mode = 0644, | |
6d456111 | 939 | .proc_handler = proc_dointvec, |
dfec072e VN |
940 | }, |
941 | #endif | |
cb684b5b | 942 | #ifdef CONFIG_BLOCK |
5e605b64 | 943 | { |
5e605b64 JA |
944 | .procname = "blk_iopoll", |
945 | .data = &blk_iopoll_enabled, | |
946 | .maxlen = sizeof(int), | |
947 | .mode = 0644, | |
6d456111 | 948 | .proc_handler = proc_dointvec, |
5e605b64 | 949 | }, |
cb684b5b | 950 | #endif |
ed2c12f3 AM |
951 | /* |
952 | * NOTE: do not add new entries to this table unless you have read | |
953 | * Documentation/sysctl/ctl_unnumbered.txt | |
954 | */ | |
6fce56ec | 955 | { } |
1da177e4 LT |
956 | }; |
957 | ||
d8217f07 | 958 | static struct ctl_table vm_table[] = { |
1da177e4 | 959 | { |
1da177e4 LT |
960 | .procname = "overcommit_memory", |
961 | .data = &sysctl_overcommit_memory, | |
962 | .maxlen = sizeof(sysctl_overcommit_memory), | |
963 | .mode = 0644, | |
6d456111 | 964 | .proc_handler = proc_dointvec, |
1da177e4 | 965 | }, |
fadd8fbd | 966 | { |
fadd8fbd KH |
967 | .procname = "panic_on_oom", |
968 | .data = &sysctl_panic_on_oom, | |
969 | .maxlen = sizeof(sysctl_panic_on_oom), | |
970 | .mode = 0644, | |
6d456111 | 971 | .proc_handler = proc_dointvec, |
fadd8fbd | 972 | }, |
fe071d7e | 973 | { |
fe071d7e DR |
974 | .procname = "oom_kill_allocating_task", |
975 | .data = &sysctl_oom_kill_allocating_task, | |
976 | .maxlen = sizeof(sysctl_oom_kill_allocating_task), | |
977 | .mode = 0644, | |
6d456111 | 978 | .proc_handler = proc_dointvec, |
fe071d7e | 979 | }, |
fef1bdd6 | 980 | { |
fef1bdd6 DR |
981 | .procname = "oom_dump_tasks", |
982 | .data = &sysctl_oom_dump_tasks, | |
983 | .maxlen = sizeof(sysctl_oom_dump_tasks), | |
984 | .mode = 0644, | |
6d456111 | 985 | .proc_handler = proc_dointvec, |
fef1bdd6 | 986 | }, |
1da177e4 | 987 | { |
1da177e4 LT |
988 | .procname = "overcommit_ratio", |
989 | .data = &sysctl_overcommit_ratio, | |
990 | .maxlen = sizeof(sysctl_overcommit_ratio), | |
991 | .mode = 0644, | |
6d456111 | 992 | .proc_handler = proc_dointvec, |
1da177e4 LT |
993 | }, |
994 | { | |
1da177e4 LT |
995 | .procname = "page-cluster", |
996 | .data = &page_cluster, | |
997 | .maxlen = sizeof(int), | |
998 | .mode = 0644, | |
6d456111 | 999 | .proc_handler = proc_dointvec, |
1da177e4 LT |
1000 | }, |
1001 | { | |
1da177e4 LT |
1002 | .procname = "dirty_background_ratio", |
1003 | .data = &dirty_background_ratio, | |
1004 | .maxlen = sizeof(dirty_background_ratio), | |
1005 | .mode = 0644, | |
6d456111 | 1006 | .proc_handler = dirty_background_ratio_handler, |
1da177e4 LT |
1007 | .extra1 = &zero, |
1008 | .extra2 = &one_hundred, | |
1009 | }, | |
2da02997 | 1010 | { |
2da02997 DR |
1011 | .procname = "dirty_background_bytes", |
1012 | .data = &dirty_background_bytes, | |
1013 | .maxlen = sizeof(dirty_background_bytes), | |
1014 | .mode = 0644, | |
6d456111 | 1015 | .proc_handler = dirty_background_bytes_handler, |
fc3501d4 | 1016 | .extra1 = &one_ul, |
2da02997 | 1017 | }, |
1da177e4 | 1018 | { |
1da177e4 LT |
1019 | .procname = "dirty_ratio", |
1020 | .data = &vm_dirty_ratio, | |
1021 | .maxlen = sizeof(vm_dirty_ratio), | |
1022 | .mode = 0644, | |
6d456111 | 1023 | .proc_handler = dirty_ratio_handler, |
1da177e4 LT |
1024 | .extra1 = &zero, |
1025 | .extra2 = &one_hundred, | |
1026 | }, | |
2da02997 | 1027 | { |
2da02997 DR |
1028 | .procname = "dirty_bytes", |
1029 | .data = &vm_dirty_bytes, | |
1030 | .maxlen = sizeof(vm_dirty_bytes), | |
1031 | .mode = 0644, | |
6d456111 | 1032 | .proc_handler = dirty_bytes_handler, |
9e4a5bda | 1033 | .extra1 = &dirty_bytes_min, |
2da02997 | 1034 | }, |
1da177e4 | 1035 | { |
1da177e4 | 1036 | .procname = "dirty_writeback_centisecs", |
f6ef9438 BS |
1037 | .data = &dirty_writeback_interval, |
1038 | .maxlen = sizeof(dirty_writeback_interval), | |
1da177e4 | 1039 | .mode = 0644, |
6d456111 | 1040 | .proc_handler = dirty_writeback_centisecs_handler, |
1da177e4 LT |
1041 | }, |
1042 | { | |
1da177e4 | 1043 | .procname = "dirty_expire_centisecs", |
f6ef9438 BS |
1044 | .data = &dirty_expire_interval, |
1045 | .maxlen = sizeof(dirty_expire_interval), | |
1da177e4 | 1046 | .mode = 0644, |
6d456111 | 1047 | .proc_handler = proc_dointvec, |
1da177e4 LT |
1048 | }, |
1049 | { | |
1da177e4 LT |
1050 | .procname = "nr_pdflush_threads", |
1051 | .data = &nr_pdflush_threads, | |
1052 | .maxlen = sizeof nr_pdflush_threads, | |
1053 | .mode = 0444 /* read-only*/, | |
6d456111 | 1054 | .proc_handler = proc_dointvec, |
1da177e4 LT |
1055 | }, |
1056 | { | |
1da177e4 LT |
1057 | .procname = "swappiness", |
1058 | .data = &vm_swappiness, | |
1059 | .maxlen = sizeof(vm_swappiness), | |
1060 | .mode = 0644, | |
6d456111 | 1061 | .proc_handler = proc_dointvec_minmax, |
1da177e4 LT |
1062 | .extra1 = &zero, |
1063 | .extra2 = &one_hundred, | |
1064 | }, | |
1065 | #ifdef CONFIG_HUGETLB_PAGE | |
06808b08 | 1066 | { |
1da177e4 | 1067 | .procname = "nr_hugepages", |
e5ff2159 | 1068 | .data = NULL, |
1da177e4 LT |
1069 | .maxlen = sizeof(unsigned long), |
1070 | .mode = 0644, | |
6d456111 | 1071 | .proc_handler = hugetlb_sysctl_handler, |
1da177e4 LT |
1072 | .extra1 = (void *)&hugetlb_zero, |
1073 | .extra2 = (void *)&hugetlb_infinity, | |
06808b08 LS |
1074 | }, |
1075 | #ifdef CONFIG_NUMA | |
1076 | { | |
1077 | .procname = "nr_hugepages_mempolicy", | |
1078 | .data = NULL, | |
1079 | .maxlen = sizeof(unsigned long), | |
1080 | .mode = 0644, | |
1081 | .proc_handler = &hugetlb_mempolicy_sysctl_handler, | |
1082 | .extra1 = (void *)&hugetlb_zero, | |
1083 | .extra2 = (void *)&hugetlb_infinity, | |
1084 | }, | |
1085 | #endif | |
1da177e4 | 1086 | { |
1da177e4 LT |
1087 | .procname = "hugetlb_shm_group", |
1088 | .data = &sysctl_hugetlb_shm_group, | |
1089 | .maxlen = sizeof(gid_t), | |
1090 | .mode = 0644, | |
6d456111 | 1091 | .proc_handler = proc_dointvec, |
1da177e4 | 1092 | }, |
396faf03 | 1093 | { |
396faf03 MG |
1094 | .procname = "hugepages_treat_as_movable", |
1095 | .data = &hugepages_treat_as_movable, | |
1096 | .maxlen = sizeof(int), | |
1097 | .mode = 0644, | |
6d456111 | 1098 | .proc_handler = hugetlb_treat_movable_handler, |
396faf03 | 1099 | }, |
d1c3fb1f | 1100 | { |
d1c3fb1f | 1101 | .procname = "nr_overcommit_hugepages", |
e5ff2159 AK |
1102 | .data = NULL, |
1103 | .maxlen = sizeof(unsigned long), | |
d1c3fb1f | 1104 | .mode = 0644, |
6d456111 | 1105 | .proc_handler = hugetlb_overcommit_handler, |
e5ff2159 AK |
1106 | .extra1 = (void *)&hugetlb_zero, |
1107 | .extra2 = (void *)&hugetlb_infinity, | |
d1c3fb1f | 1108 | }, |
1da177e4 LT |
1109 | #endif |
1110 | { | |
1da177e4 LT |
1111 | .procname = "lowmem_reserve_ratio", |
1112 | .data = &sysctl_lowmem_reserve_ratio, | |
1113 | .maxlen = sizeof(sysctl_lowmem_reserve_ratio), | |
1114 | .mode = 0644, | |
6d456111 | 1115 | .proc_handler = lowmem_reserve_ratio_sysctl_handler, |
1da177e4 | 1116 | }, |
9d0243bc | 1117 | { |
9d0243bc AM |
1118 | .procname = "drop_caches", |
1119 | .data = &sysctl_drop_caches, | |
1120 | .maxlen = sizeof(int), | |
1121 | .mode = 0644, | |
1122 | .proc_handler = drop_caches_sysctl_handler, | |
9d0243bc | 1123 | }, |
1da177e4 | 1124 | { |
1da177e4 LT |
1125 | .procname = "min_free_kbytes", |
1126 | .data = &min_free_kbytes, | |
1127 | .maxlen = sizeof(min_free_kbytes), | |
1128 | .mode = 0644, | |
6d456111 | 1129 | .proc_handler = min_free_kbytes_sysctl_handler, |
1da177e4 LT |
1130 | .extra1 = &zero, |
1131 | }, | |
8ad4b1fb | 1132 | { |
8ad4b1fb RS |
1133 | .procname = "percpu_pagelist_fraction", |
1134 | .data = &percpu_pagelist_fraction, | |
1135 | .maxlen = sizeof(percpu_pagelist_fraction), | |
1136 | .mode = 0644, | |
6d456111 | 1137 | .proc_handler = percpu_pagelist_fraction_sysctl_handler, |
8ad4b1fb RS |
1138 | .extra1 = &min_percpu_pagelist_fract, |
1139 | }, | |
1da177e4 LT |
1140 | #ifdef CONFIG_MMU |
1141 | { | |
1da177e4 LT |
1142 | .procname = "max_map_count", |
1143 | .data = &sysctl_max_map_count, | |
1144 | .maxlen = sizeof(sysctl_max_map_count), | |
1145 | .mode = 0644, | |
3e26120c | 1146 | .proc_handler = proc_dointvec_minmax, |
70da2340 | 1147 | .extra1 = &zero, |
1da177e4 | 1148 | }, |
dd8632a1 PM |
1149 | #else |
1150 | { | |
dd8632a1 PM |
1151 | .procname = "nr_trim_pages", |
1152 | .data = &sysctl_nr_trim_pages, | |
1153 | .maxlen = sizeof(sysctl_nr_trim_pages), | |
1154 | .mode = 0644, | |
6d456111 | 1155 | .proc_handler = proc_dointvec_minmax, |
dd8632a1 PM |
1156 | .extra1 = &zero, |
1157 | }, | |
1da177e4 LT |
1158 | #endif |
1159 | { | |
1da177e4 LT |
1160 | .procname = "laptop_mode", |
1161 | .data = &laptop_mode, | |
1162 | .maxlen = sizeof(laptop_mode), | |
1163 | .mode = 0644, | |
6d456111 | 1164 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
1165 | }, |
1166 | { | |
1da177e4 LT |
1167 | .procname = "block_dump", |
1168 | .data = &block_dump, | |
1169 | .maxlen = sizeof(block_dump), | |
1170 | .mode = 0644, | |
6d456111 | 1171 | .proc_handler = proc_dointvec, |
1da177e4 LT |
1172 | .extra1 = &zero, |
1173 | }, | |
1174 | { | |
1da177e4 LT |
1175 | .procname = "vfs_cache_pressure", |
1176 | .data = &sysctl_vfs_cache_pressure, | |
1177 | .maxlen = sizeof(sysctl_vfs_cache_pressure), | |
1178 | .mode = 0644, | |
6d456111 | 1179 | .proc_handler = proc_dointvec, |
1da177e4 LT |
1180 | .extra1 = &zero, |
1181 | }, | |
1182 | #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT | |
1183 | { | |
1da177e4 LT |
1184 | .procname = "legacy_va_layout", |
1185 | .data = &sysctl_legacy_va_layout, | |
1186 | .maxlen = sizeof(sysctl_legacy_va_layout), | |
1187 | .mode = 0644, | |
6d456111 | 1188 | .proc_handler = proc_dointvec, |
1da177e4 LT |
1189 | .extra1 = &zero, |
1190 | }, | |
1191 | #endif | |
1743660b CL |
1192 | #ifdef CONFIG_NUMA |
1193 | { | |
1743660b CL |
1194 | .procname = "zone_reclaim_mode", |
1195 | .data = &zone_reclaim_mode, | |
1196 | .maxlen = sizeof(zone_reclaim_mode), | |
1197 | .mode = 0644, | |
6d456111 | 1198 | .proc_handler = proc_dointvec, |
c84db23c | 1199 | .extra1 = &zero, |
1743660b | 1200 | }, |
9614634f | 1201 | { |
9614634f CL |
1202 | .procname = "min_unmapped_ratio", |
1203 | .data = &sysctl_min_unmapped_ratio, | |
1204 | .maxlen = sizeof(sysctl_min_unmapped_ratio), | |
1205 | .mode = 0644, | |
6d456111 | 1206 | .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler, |
9614634f CL |
1207 | .extra1 = &zero, |
1208 | .extra2 = &one_hundred, | |
1209 | }, | |
0ff38490 | 1210 | { |
0ff38490 CL |
1211 | .procname = "min_slab_ratio", |
1212 | .data = &sysctl_min_slab_ratio, | |
1213 | .maxlen = sizeof(sysctl_min_slab_ratio), | |
1214 | .mode = 0644, | |
6d456111 | 1215 | .proc_handler = sysctl_min_slab_ratio_sysctl_handler, |
0ff38490 CL |
1216 | .extra1 = &zero, |
1217 | .extra2 = &one_hundred, | |
1218 | }, | |
e6e5494c | 1219 | #endif |
77461ab3 CL |
1220 | #ifdef CONFIG_SMP |
1221 | { | |
77461ab3 CL |
1222 | .procname = "stat_interval", |
1223 | .data = &sysctl_stat_interval, | |
1224 | .maxlen = sizeof(sysctl_stat_interval), | |
1225 | .mode = 0644, | |
6d456111 | 1226 | .proc_handler = proc_dointvec_jiffies, |
77461ab3 CL |
1227 | }, |
1228 | #endif | |
6e141546 | 1229 | #ifdef CONFIG_MMU |
ed032189 | 1230 | { |
ed032189 | 1231 | .procname = "mmap_min_addr", |
788084ab EP |
1232 | .data = &dac_mmap_min_addr, |
1233 | .maxlen = sizeof(unsigned long), | |
ed032189 | 1234 | .mode = 0644, |
6d456111 | 1235 | .proc_handler = mmap_min_addr_handler, |
ed032189 | 1236 | }, |
6e141546 | 1237 | #endif |
f0c0b2b8 KH |
1238 | #ifdef CONFIG_NUMA |
1239 | { | |
f0c0b2b8 KH |
1240 | .procname = "numa_zonelist_order", |
1241 | .data = &numa_zonelist_order, | |
1242 | .maxlen = NUMA_ZONELIST_ORDER_LEN, | |
1243 | .mode = 0644, | |
6d456111 | 1244 | .proc_handler = numa_zonelist_order_handler, |
f0c0b2b8 KH |
1245 | }, |
1246 | #endif | |
2b8232ce | 1247 | #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \ |
5c36e657 | 1248 | (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL)) |
e6e5494c | 1249 | { |
e6e5494c IM |
1250 | .procname = "vdso_enabled", |
1251 | .data = &vdso_enabled, | |
1252 | .maxlen = sizeof(vdso_enabled), | |
1253 | .mode = 0644, | |
6d456111 | 1254 | .proc_handler = proc_dointvec, |
e6e5494c IM |
1255 | .extra1 = &zero, |
1256 | }, | |
1da177e4 | 1257 | #endif |
195cf453 BG |
1258 | #ifdef CONFIG_HIGHMEM |
1259 | { | |
195cf453 BG |
1260 | .procname = "highmem_is_dirtyable", |
1261 | .data = &vm_highmem_is_dirtyable, | |
1262 | .maxlen = sizeof(vm_highmem_is_dirtyable), | |
1263 | .mode = 0644, | |
6d456111 | 1264 | .proc_handler = proc_dointvec_minmax, |
195cf453 BG |
1265 | .extra1 = &zero, |
1266 | .extra2 = &one, | |
1267 | }, | |
1268 | #endif | |
4be6f6bb | 1269 | { |
4be6f6bb PZ |
1270 | .procname = "scan_unevictable_pages", |
1271 | .data = &scan_unevictable_pages, | |
1272 | .maxlen = sizeof(scan_unevictable_pages), | |
1273 | .mode = 0644, | |
6d456111 | 1274 | .proc_handler = scan_unevictable_handler, |
4be6f6bb | 1275 | }, |
6a46079c AK |
1276 | #ifdef CONFIG_MEMORY_FAILURE |
1277 | { | |
6a46079c AK |
1278 | .procname = "memory_failure_early_kill", |
1279 | .data = &sysctl_memory_failure_early_kill, | |
1280 | .maxlen = sizeof(sysctl_memory_failure_early_kill), | |
1281 | .mode = 0644, | |
6d456111 | 1282 | .proc_handler = proc_dointvec_minmax, |
6a46079c AK |
1283 | .extra1 = &zero, |
1284 | .extra2 = &one, | |
1285 | }, | |
1286 | { | |
6a46079c AK |
1287 | .procname = "memory_failure_recovery", |
1288 | .data = &sysctl_memory_failure_recovery, | |
1289 | .maxlen = sizeof(sysctl_memory_failure_recovery), | |
1290 | .mode = 0644, | |
6d456111 | 1291 | .proc_handler = proc_dointvec_minmax, |
6a46079c AK |
1292 | .extra1 = &zero, |
1293 | .extra2 = &one, | |
1294 | }, | |
1295 | #endif | |
1296 | ||
2be7fe07 AM |
1297 | /* |
1298 | * NOTE: do not add new entries to this table unless you have read | |
1299 | * Documentation/sysctl/ctl_unnumbered.txt | |
1300 | */ | |
6fce56ec | 1301 | { } |
1da177e4 LT |
1302 | }; |
1303 | ||
2abc26fc | 1304 | #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) |
d8217f07 | 1305 | static struct ctl_table binfmt_misc_table[] = { |
6fce56ec | 1306 | { } |
2abc26fc EB |
1307 | }; |
1308 | #endif | |
1309 | ||
d8217f07 | 1310 | static struct ctl_table fs_table[] = { |
1da177e4 | 1311 | { |
1da177e4 LT |
1312 | .procname = "inode-nr", |
1313 | .data = &inodes_stat, | |
1314 | .maxlen = 2*sizeof(int), | |
1315 | .mode = 0444, | |
6d456111 | 1316 | .proc_handler = proc_dointvec, |
1da177e4 LT |
1317 | }, |
1318 | { | |
1da177e4 LT |
1319 | .procname = "inode-state", |
1320 | .data = &inodes_stat, | |
1321 | .maxlen = 7*sizeof(int), | |
1322 | .mode = 0444, | |
6d456111 | 1323 | .proc_handler = proc_dointvec, |
1da177e4 LT |
1324 | }, |
1325 | { | |
1da177e4 LT |
1326 | .procname = "file-nr", |
1327 | .data = &files_stat, | |
1328 | .maxlen = 3*sizeof(int), | |
1329 | .mode = 0444, | |
6d456111 | 1330 | .proc_handler = proc_nr_files, |
1da177e4 LT |
1331 | }, |
1332 | { | |
1da177e4 LT |
1333 | .procname = "file-max", |
1334 | .data = &files_stat.max_files, | |
1335 | .maxlen = sizeof(int), | |
1336 | .mode = 0644, | |
6d456111 | 1337 | .proc_handler = proc_dointvec, |
1da177e4 | 1338 | }, |
9cfe015a | 1339 | { |
9cfe015a ED |
1340 | .procname = "nr_open", |
1341 | .data = &sysctl_nr_open, | |
1342 | .maxlen = sizeof(int), | |
1343 | .mode = 0644, | |
6d456111 | 1344 | .proc_handler = proc_dointvec_minmax, |
eceea0b3 AV |
1345 | .extra1 = &sysctl_nr_open_min, |
1346 | .extra2 = &sysctl_nr_open_max, | |
9cfe015a | 1347 | }, |
1da177e4 | 1348 | { |
1da177e4 LT |
1349 | .procname = "dentry-state", |
1350 | .data = &dentry_stat, | |
1351 | .maxlen = 6*sizeof(int), | |
1352 | .mode = 0444, | |
6d456111 | 1353 | .proc_handler = proc_dointvec, |
1da177e4 LT |
1354 | }, |
1355 | { | |
1da177e4 LT |
1356 | .procname = "overflowuid", |
1357 | .data = &fs_overflowuid, | |
1358 | .maxlen = sizeof(int), | |
1359 | .mode = 0644, | |
6d456111 | 1360 | .proc_handler = proc_dointvec_minmax, |
1da177e4 LT |
1361 | .extra1 = &minolduid, |
1362 | .extra2 = &maxolduid, | |
1363 | }, | |
1364 | { | |
1da177e4 LT |
1365 | .procname = "overflowgid", |
1366 | .data = &fs_overflowgid, | |
1367 | .maxlen = sizeof(int), | |
1368 | .mode = 0644, | |
6d456111 | 1369 | .proc_handler = proc_dointvec_minmax, |
1da177e4 LT |
1370 | .extra1 = &minolduid, |
1371 | .extra2 = &maxolduid, | |
1372 | }, | |
bfcd17a6 | 1373 | #ifdef CONFIG_FILE_LOCKING |
1da177e4 | 1374 | { |
1da177e4 LT |
1375 | .procname = "leases-enable", |
1376 | .data = &leases_enable, | |
1377 | .maxlen = sizeof(int), | |
1378 | .mode = 0644, | |
6d456111 | 1379 | .proc_handler = proc_dointvec, |
1da177e4 | 1380 | }, |
bfcd17a6 | 1381 | #endif |
1da177e4 LT |
1382 | #ifdef CONFIG_DNOTIFY |
1383 | { | |
1da177e4 LT |
1384 | .procname = "dir-notify-enable", |
1385 | .data = &dir_notify_enable, | |
1386 | .maxlen = sizeof(int), | |
1387 | .mode = 0644, | |
6d456111 | 1388 | .proc_handler = proc_dointvec, |
1da177e4 LT |
1389 | }, |
1390 | #endif | |
1391 | #ifdef CONFIG_MMU | |
bfcd17a6 | 1392 | #ifdef CONFIG_FILE_LOCKING |
1da177e4 | 1393 | { |
1da177e4 LT |
1394 | .procname = "lease-break-time", |
1395 | .data = &lease_break_time, | |
1396 | .maxlen = sizeof(int), | |
1397 | .mode = 0644, | |
6d456111 | 1398 | .proc_handler = proc_dointvec, |
1da177e4 | 1399 | }, |
bfcd17a6 | 1400 | #endif |
ebf3f09c | 1401 | #ifdef CONFIG_AIO |
1da177e4 | 1402 | { |
1da177e4 LT |
1403 | .procname = "aio-nr", |
1404 | .data = &aio_nr, | |
1405 | .maxlen = sizeof(aio_nr), | |
1406 | .mode = 0444, | |
6d456111 | 1407 | .proc_handler = proc_doulongvec_minmax, |
1da177e4 LT |
1408 | }, |
1409 | { | |
1da177e4 LT |
1410 | .procname = "aio-max-nr", |
1411 | .data = &aio_max_nr, | |
1412 | .maxlen = sizeof(aio_max_nr), | |
1413 | .mode = 0644, | |
6d456111 | 1414 | .proc_handler = proc_doulongvec_minmax, |
1da177e4 | 1415 | }, |
ebf3f09c | 1416 | #endif /* CONFIG_AIO */ |
2d9048e2 | 1417 | #ifdef CONFIG_INOTIFY_USER |
0399cb08 | 1418 | { |
0399cb08 RL |
1419 | .procname = "inotify", |
1420 | .mode = 0555, | |
1421 | .child = inotify_table, | |
1422 | }, | |
1423 | #endif | |
7ef9964e DL |
1424 | #ifdef CONFIG_EPOLL |
1425 | { | |
1426 | .procname = "epoll", | |
1427 | .mode = 0555, | |
1428 | .child = epoll_table, | |
1429 | }, | |
1430 | #endif | |
1da177e4 | 1431 | #endif |
d6e71144 | 1432 | { |
d6e71144 AC |
1433 | .procname = "suid_dumpable", |
1434 | .data = &suid_dumpable, | |
1435 | .maxlen = sizeof(int), | |
1436 | .mode = 0644, | |
6d456111 | 1437 | .proc_handler = proc_dointvec_minmax, |
8e654fba MW |
1438 | .extra1 = &zero, |
1439 | .extra2 = &two, | |
d6e71144 | 1440 | }, |
2abc26fc EB |
1441 | #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) |
1442 | { | |
2abc26fc EB |
1443 | .procname = "binfmt_misc", |
1444 | .mode = 0555, | |
1445 | .child = binfmt_misc_table, | |
1446 | }, | |
1447 | #endif | |
b492e95b JA |
1448 | { |
1449 | .procname = "pipe-max-pages", | |
1450 | .data = &pipe_max_pages, | |
1451 | .maxlen = sizeof(int), | |
1452 | .mode = 0644, | |
1453 | .proc_handler = &proc_dointvec_minmax, | |
1454 | .extra1 = &two, | |
1455 | }, | |
2be7fe07 AM |
1456 | /* |
1457 | * NOTE: do not add new entries to this table unless you have read | |
1458 | * Documentation/sysctl/ctl_unnumbered.txt | |
2be7fe07 | 1459 | */ |
6fce56ec | 1460 | { } |
1da177e4 LT |
1461 | }; |
1462 | ||
d8217f07 | 1463 | static struct ctl_table debug_table[] = { |
ab3c68ee HC |
1464 | #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_SPARC) || \ |
1465 | defined(CONFIG_S390) | |
abd4f750 | 1466 | { |
abd4f750 MAS |
1467 | .procname = "exception-trace", |
1468 | .data = &show_unhandled_signals, | |
1469 | .maxlen = sizeof(int), | |
1470 | .mode = 0644, | |
1471 | .proc_handler = proc_dointvec | |
1472 | }, | |
b2be84df MH |
1473 | #endif |
1474 | #if defined(CONFIG_OPTPROBES) | |
1475 | { | |
1476 | .procname = "kprobes-optimization", | |
1477 | .data = &sysctl_kprobes_optimization, | |
1478 | .maxlen = sizeof(int), | |
1479 | .mode = 0644, | |
1480 | .proc_handler = proc_kprobes_optimization_handler, | |
1481 | .extra1 = &zero, | |
1482 | .extra2 = &one, | |
1483 | }, | |
abd4f750 | 1484 | #endif |
6fce56ec | 1485 | { } |
1da177e4 LT |
1486 | }; |
1487 | ||
d8217f07 | 1488 | static struct ctl_table dev_table[] = { |
6fce56ec | 1489 | { } |
0eeca283 | 1490 | }; |
1da177e4 | 1491 | |
330d57fb AV |
1492 | static DEFINE_SPINLOCK(sysctl_lock); |
1493 | ||
1494 | /* called under sysctl_lock */ | |
1495 | static int use_table(struct ctl_table_header *p) | |
1496 | { | |
1497 | if (unlikely(p->unregistering)) | |
1498 | return 0; | |
1499 | p->used++; | |
1500 | return 1; | |
1501 | } | |
1502 | ||
1503 | /* called under sysctl_lock */ | |
1504 | static void unuse_table(struct ctl_table_header *p) | |
1505 | { | |
1506 | if (!--p->used) | |
1507 | if (unlikely(p->unregistering)) | |
1508 | complete(p->unregistering); | |
1509 | } | |
1510 | ||
1511 | /* called under sysctl_lock, will reacquire if has to wait */ | |
1512 | static void start_unregistering(struct ctl_table_header *p) | |
1513 | { | |
1514 | /* | |
1515 | * if p->used is 0, nobody will ever touch that entry again; | |
1516 | * we'll eliminate all paths to it before dropping sysctl_lock | |
1517 | */ | |
1518 | if (unlikely(p->used)) { | |
1519 | struct completion wait; | |
1520 | init_completion(&wait); | |
1521 | p->unregistering = &wait; | |
1522 | spin_unlock(&sysctl_lock); | |
1523 | wait_for_completion(&wait); | |
1524 | spin_lock(&sysctl_lock); | |
f7e6ced4 AV |
1525 | } else { |
1526 | /* anything non-NULL; we'll never dereference it */ | |
1527 | p->unregistering = ERR_PTR(-EINVAL); | |
330d57fb AV |
1528 | } |
1529 | /* | |
1530 | * do not remove from the list until nobody holds it; walking the | |
1531 | * list in do_sysctl() relies on that. | |
1532 | */ | |
1533 | list_del_init(&p->ctl_entry); | |
1534 | } | |
1535 | ||
f7e6ced4 AV |
1536 | void sysctl_head_get(struct ctl_table_header *head) |
1537 | { | |
1538 | spin_lock(&sysctl_lock); | |
1539 | head->count++; | |
1540 | spin_unlock(&sysctl_lock); | |
1541 | } | |
1542 | ||
1543 | void sysctl_head_put(struct ctl_table_header *head) | |
1544 | { | |
1545 | spin_lock(&sysctl_lock); | |
1546 | if (!--head->count) | |
1547 | kfree(head); | |
1548 | spin_unlock(&sysctl_lock); | |
1549 | } | |
1550 | ||
1551 | struct ctl_table_header *sysctl_head_grab(struct ctl_table_header *head) | |
1552 | { | |
1553 | if (!head) | |
1554 | BUG(); | |
1555 | spin_lock(&sysctl_lock); | |
1556 | if (!use_table(head)) | |
1557 | head = ERR_PTR(-ENOENT); | |
1558 | spin_unlock(&sysctl_lock); | |
1559 | return head; | |
1560 | } | |
1561 | ||
805b5d5e EB |
1562 | void sysctl_head_finish(struct ctl_table_header *head) |
1563 | { | |
1564 | if (!head) | |
1565 | return; | |
1566 | spin_lock(&sysctl_lock); | |
1567 | unuse_table(head); | |
1568 | spin_unlock(&sysctl_lock); | |
1569 | } | |
1570 | ||
73455092 AV |
1571 | static struct ctl_table_set * |
1572 | lookup_header_set(struct ctl_table_root *root, struct nsproxy *namespaces) | |
1573 | { | |
1574 | struct ctl_table_set *set = &root->default_set; | |
1575 | if (root->lookup) | |
1576 | set = root->lookup(root, namespaces); | |
1577 | return set; | |
1578 | } | |
1579 | ||
e51b6ba0 EB |
1580 | static struct list_head * |
1581 | lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces) | |
805b5d5e | 1582 | { |
73455092 AV |
1583 | struct ctl_table_set *set = lookup_header_set(root, namespaces); |
1584 | return &set->list; | |
e51b6ba0 EB |
1585 | } |
1586 | ||
1587 | struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces, | |
1588 | struct ctl_table_header *prev) | |
1589 | { | |
1590 | struct ctl_table_root *root; | |
1591 | struct list_head *header_list; | |
805b5d5e EB |
1592 | struct ctl_table_header *head; |
1593 | struct list_head *tmp; | |
e51b6ba0 | 1594 | |
805b5d5e EB |
1595 | spin_lock(&sysctl_lock); |
1596 | if (prev) { | |
e51b6ba0 | 1597 | head = prev; |
805b5d5e EB |
1598 | tmp = &prev->ctl_entry; |
1599 | unuse_table(prev); | |
1600 | goto next; | |
1601 | } | |
1602 | tmp = &root_table_header.ctl_entry; | |
1603 | for (;;) { | |
1604 | head = list_entry(tmp, struct ctl_table_header, ctl_entry); | |
1605 | ||
1606 | if (!use_table(head)) | |
1607 | goto next; | |
1608 | spin_unlock(&sysctl_lock); | |
1609 | return head; | |
1610 | next: | |
e51b6ba0 | 1611 | root = head->root; |
805b5d5e | 1612 | tmp = tmp->next; |
e51b6ba0 EB |
1613 | header_list = lookup_header_list(root, namespaces); |
1614 | if (tmp != header_list) | |
1615 | continue; | |
1616 | ||
1617 | do { | |
1618 | root = list_entry(root->root_list.next, | |
1619 | struct ctl_table_root, root_list); | |
1620 | if (root == &sysctl_table_root) | |
1621 | goto out; | |
1622 | header_list = lookup_header_list(root, namespaces); | |
1623 | } while (list_empty(header_list)); | |
1624 | tmp = header_list->next; | |
805b5d5e | 1625 | } |
e51b6ba0 | 1626 | out: |
805b5d5e EB |
1627 | spin_unlock(&sysctl_lock); |
1628 | return NULL; | |
1629 | } | |
1630 | ||
e51b6ba0 EB |
1631 | struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev) |
1632 | { | |
1633 | return __sysctl_head_next(current->nsproxy, prev); | |
1634 | } | |
1635 | ||
1636 | void register_sysctl_root(struct ctl_table_root *root) | |
1637 | { | |
1638 | spin_lock(&sysctl_lock); | |
1639 | list_add_tail(&root->root_list, &sysctl_table_root.root_list); | |
1640 | spin_unlock(&sysctl_lock); | |
1641 | } | |
1642 | ||
1da177e4 | 1643 | /* |
1ff007eb | 1644 | * sysctl_perm does NOT grant the superuser all rights automatically, because |
1da177e4 LT |
1645 | * some sysctl variables are readonly even to root. |
1646 | */ | |
1647 | ||
1648 | static int test_perm(int mode, int op) | |
1649 | { | |
76aac0e9 | 1650 | if (!current_euid()) |
1da177e4 LT |
1651 | mode >>= 6; |
1652 | else if (in_egroup_p(0)) | |
1653 | mode >>= 3; | |
e6305c43 | 1654 | if ((op & ~mode & (MAY_READ|MAY_WRITE|MAY_EXEC)) == 0) |
1da177e4 LT |
1655 | return 0; |
1656 | return -EACCES; | |
1657 | } | |
1658 | ||
d7321cd6 | 1659 | int sysctl_perm(struct ctl_table_root *root, struct ctl_table *table, int op) |
1da177e4 LT |
1660 | { |
1661 | int error; | |
d7321cd6 PE |
1662 | int mode; |
1663 | ||
e6305c43 | 1664 | error = security_sysctl(table, op & (MAY_READ | MAY_WRITE | MAY_EXEC)); |
1da177e4 LT |
1665 | if (error) |
1666 | return error; | |
d7321cd6 PE |
1667 | |
1668 | if (root->permissions) | |
1669 | mode = root->permissions(root, current->nsproxy, table); | |
1670 | else | |
1671 | mode = table->mode; | |
1672 | ||
1673 | return test_perm(mode, op); | |
1da177e4 LT |
1674 | } |
1675 | ||
d912b0cc EB |
1676 | static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table) |
1677 | { | |
2315ffa0 | 1678 | for (; table->procname; table++) { |
d912b0cc EB |
1679 | table->parent = parent; |
1680 | if (table->child) | |
1681 | sysctl_set_parent(table, table->child); | |
1682 | } | |
1683 | } | |
1684 | ||
1685 | static __init int sysctl_init(void) | |
1686 | { | |
1687 | sysctl_set_parent(NULL, root_table); | |
88f458e4 HS |
1688 | #ifdef CONFIG_SYSCTL_SYSCALL_CHECK |
1689 | { | |
1690 | int err; | |
1691 | err = sysctl_check_table(current->nsproxy, root_table); | |
1692 | } | |
1693 | #endif | |
d912b0cc EB |
1694 | return 0; |
1695 | } | |
1696 | ||
1697 | core_initcall(sysctl_init); | |
1698 | ||
bfbcf034 AV |
1699 | static struct ctl_table *is_branch_in(struct ctl_table *branch, |
1700 | struct ctl_table *table) | |
ae7edecc AV |
1701 | { |
1702 | struct ctl_table *p; | |
1703 | const char *s = branch->procname; | |
1704 | ||
1705 | /* branch should have named subdirectory as its first element */ | |
1706 | if (!s || !branch->child) | |
bfbcf034 | 1707 | return NULL; |
ae7edecc AV |
1708 | |
1709 | /* ... and nothing else */ | |
2315ffa0 | 1710 | if (branch[1].procname) |
bfbcf034 | 1711 | return NULL; |
ae7edecc AV |
1712 | |
1713 | /* table should contain subdirectory with the same name */ | |
2315ffa0 | 1714 | for (p = table; p->procname; p++) { |
ae7edecc AV |
1715 | if (!p->child) |
1716 | continue; | |
1717 | if (p->procname && strcmp(p->procname, s) == 0) | |
bfbcf034 | 1718 | return p; |
ae7edecc | 1719 | } |
bfbcf034 | 1720 | return NULL; |
ae7edecc AV |
1721 | } |
1722 | ||
1723 | /* see if attaching q to p would be an improvement */ | |
1724 | static void try_attach(struct ctl_table_header *p, struct ctl_table_header *q) | |
1725 | { | |
1726 | struct ctl_table *to = p->ctl_table, *by = q->ctl_table; | |
bfbcf034 | 1727 | struct ctl_table *next; |
ae7edecc AV |
1728 | int is_better = 0; |
1729 | int not_in_parent = !p->attached_by; | |
1730 | ||
bfbcf034 | 1731 | while ((next = is_branch_in(by, to)) != NULL) { |
ae7edecc AV |
1732 | if (by == q->attached_by) |
1733 | is_better = 1; | |
1734 | if (to == p->attached_by) | |
1735 | not_in_parent = 1; | |
1736 | by = by->child; | |
bfbcf034 | 1737 | to = next->child; |
ae7edecc AV |
1738 | } |
1739 | ||
1740 | if (is_better && not_in_parent) { | |
1741 | q->attached_by = by; | |
1742 | q->attached_to = to; | |
1743 | q->parent = p; | |
1744 | } | |
1745 | } | |
1746 | ||
1da177e4 | 1747 | /** |
e51b6ba0 EB |
1748 | * __register_sysctl_paths - register a sysctl hierarchy |
1749 | * @root: List of sysctl headers to register on | |
1750 | * @namespaces: Data to compute which lists of sysctl entries are visible | |
29e796fd | 1751 | * @path: The path to the directory the sysctl table is in. |
1da177e4 | 1752 | * @table: the top-level table structure |
1da177e4 LT |
1753 | * |
1754 | * Register a sysctl table hierarchy. @table should be a filled in ctl_table | |
29e796fd | 1755 | * array. A completely 0 filled entry terminates the table. |
1da177e4 | 1756 | * |
d8217f07 | 1757 | * The members of the &struct ctl_table structure are used as follows: |
1da177e4 | 1758 | * |
1da177e4 LT |
1759 | * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not |
1760 | * enter a sysctl file | |
1761 | * | |
1762 | * data - a pointer to data for use by proc_handler | |
1763 | * | |
1764 | * maxlen - the maximum size in bytes of the data | |
1765 | * | |
1766 | * mode - the file permissions for the /proc/sys file, and for sysctl(2) | |
1767 | * | |
1768 | * child - a pointer to the child sysctl table if this entry is a directory, or | |
1769 | * %NULL. | |
1770 | * | |
1771 | * proc_handler - the text handler routine (described below) | |
1772 | * | |
1da177e4 LT |
1773 | * de - for internal use by the sysctl routines |
1774 | * | |
1775 | * extra1, extra2 - extra pointers usable by the proc handler routines | |
1776 | * | |
1777 | * Leaf nodes in the sysctl tree will be represented by a single file | |
1778 | * under /proc; non-leaf nodes will be represented by directories. | |
1779 | * | |
1780 | * sysctl(2) can automatically manage read and write requests through | |
1781 | * the sysctl table. The data and maxlen fields of the ctl_table | |
1782 | * struct enable minimal validation of the values being written to be | |
1783 | * performed, and the mode field allows minimal authentication. | |
1784 | * | |
1da177e4 LT |
1785 | * There must be a proc_handler routine for any terminal nodes |
1786 | * mirrored under /proc/sys (non-terminals are handled by a built-in | |
1787 | * directory handler). Several default handlers are available to | |
1788 | * cover common cases - | |
1789 | * | |
1790 | * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(), | |
1791 | * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(), | |
1792 | * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax() | |
1793 | * | |
1794 | * It is the handler's job to read the input buffer from user memory | |
1795 | * and process it. The handler should return 0 on success. | |
1796 | * | |
1797 | * This routine returns %NULL on a failure to register, and a pointer | |
1798 | * to the table header on success. | |
1799 | */ | |
e51b6ba0 EB |
1800 | struct ctl_table_header *__register_sysctl_paths( |
1801 | struct ctl_table_root *root, | |
1802 | struct nsproxy *namespaces, | |
1803 | const struct ctl_path *path, struct ctl_table *table) | |
1da177e4 | 1804 | { |
29e796fd EB |
1805 | struct ctl_table_header *header; |
1806 | struct ctl_table *new, **prevp; | |
1807 | unsigned int n, npath; | |
ae7edecc | 1808 | struct ctl_table_set *set; |
29e796fd EB |
1809 | |
1810 | /* Count the path components */ | |
2315ffa0 | 1811 | for (npath = 0; path[npath].procname; ++npath) |
29e796fd EB |
1812 | ; |
1813 | ||
1814 | /* | |
1815 | * For each path component, allocate a 2-element ctl_table array. | |
1816 | * The first array element will be filled with the sysctl entry | |
2315ffa0 | 1817 | * for this, the second will be the sentinel (procname == 0). |
29e796fd EB |
1818 | * |
1819 | * We allocate everything in one go so that we don't have to | |
1820 | * worry about freeing additional memory in unregister_sysctl_table. | |
1821 | */ | |
1822 | header = kzalloc(sizeof(struct ctl_table_header) + | |
1823 | (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL); | |
1824 | if (!header) | |
1da177e4 | 1825 | return NULL; |
29e796fd EB |
1826 | |
1827 | new = (struct ctl_table *) (header + 1); | |
1828 | ||
1829 | /* Now connect the dots */ | |
1830 | prevp = &header->ctl_table; | |
1831 | for (n = 0; n < npath; ++n, ++path) { | |
1832 | /* Copy the procname */ | |
1833 | new->procname = path->procname; | |
29e796fd EB |
1834 | new->mode = 0555; |
1835 | ||
1836 | *prevp = new; | |
1837 | prevp = &new->child; | |
1838 | ||
1839 | new += 2; | |
1840 | } | |
1841 | *prevp = table; | |
23eb06de | 1842 | header->ctl_table_arg = table; |
29e796fd EB |
1843 | |
1844 | INIT_LIST_HEAD(&header->ctl_entry); | |
1845 | header->used = 0; | |
1846 | header->unregistering = NULL; | |
e51b6ba0 | 1847 | header->root = root; |
29e796fd | 1848 | sysctl_set_parent(NULL, header->ctl_table); |
f7e6ced4 | 1849 | header->count = 1; |
88f458e4 | 1850 | #ifdef CONFIG_SYSCTL_SYSCALL_CHECK |
e51b6ba0 | 1851 | if (sysctl_check_table(namespaces, header->ctl_table)) { |
29e796fd | 1852 | kfree(header); |
fc6cd25b EB |
1853 | return NULL; |
1854 | } | |
88f458e4 | 1855 | #endif |
330d57fb | 1856 | spin_lock(&sysctl_lock); |
73455092 | 1857 | header->set = lookup_header_set(root, namespaces); |
ae7edecc AV |
1858 | header->attached_by = header->ctl_table; |
1859 | header->attached_to = root_table; | |
1860 | header->parent = &root_table_header; | |
1861 | for (set = header->set; set; set = set->parent) { | |
1862 | struct ctl_table_header *p; | |
1863 | list_for_each_entry(p, &set->list, ctl_entry) { | |
1864 | if (p->unregistering) | |
1865 | continue; | |
1866 | try_attach(p, header); | |
1867 | } | |
1868 | } | |
1869 | header->parent->count++; | |
73455092 | 1870 | list_add_tail(&header->ctl_entry, &header->set->list); |
330d57fb | 1871 | spin_unlock(&sysctl_lock); |
29e796fd EB |
1872 | |
1873 | return header; | |
1874 | } | |
1875 | ||
e51b6ba0 EB |
1876 | /** |
1877 | * register_sysctl_table_path - register a sysctl table hierarchy | |
1878 | * @path: The path to the directory the sysctl table is in. | |
1879 | * @table: the top-level table structure | |
1880 | * | |
1881 | * Register a sysctl table hierarchy. @table should be a filled in ctl_table | |
1882 | * array. A completely 0 filled entry terminates the table. | |
1883 | * | |
1884 | * See __register_sysctl_paths for more details. | |
1885 | */ | |
1886 | struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path, | |
1887 | struct ctl_table *table) | |
1888 | { | |
1889 | return __register_sysctl_paths(&sysctl_table_root, current->nsproxy, | |
1890 | path, table); | |
1891 | } | |
1892 | ||
29e796fd EB |
1893 | /** |
1894 | * register_sysctl_table - register a sysctl table hierarchy | |
1895 | * @table: the top-level table structure | |
1896 | * | |
1897 | * Register a sysctl table hierarchy. @table should be a filled in ctl_table | |
1898 | * array. A completely 0 filled entry terminates the table. | |
1899 | * | |
1900 | * See register_sysctl_paths for more details. | |
1901 | */ | |
1902 | struct ctl_table_header *register_sysctl_table(struct ctl_table *table) | |
1903 | { | |
1904 | static const struct ctl_path null_path[] = { {} }; | |
1905 | ||
1906 | return register_sysctl_paths(null_path, table); | |
1da177e4 LT |
1907 | } |
1908 | ||
1909 | /** | |
1910 | * unregister_sysctl_table - unregister a sysctl table hierarchy | |
1911 | * @header: the header returned from register_sysctl_table | |
1912 | * | |
1913 | * Unregisters the sysctl table and all children. proc entries may not | |
1914 | * actually be removed until they are no longer used by anyone. | |
1915 | */ | |
1916 | void unregister_sysctl_table(struct ctl_table_header * header) | |
1917 | { | |
330d57fb | 1918 | might_sleep(); |
f1dad166 PE |
1919 | |
1920 | if (header == NULL) | |
1921 | return; | |
1922 | ||
330d57fb AV |
1923 | spin_lock(&sysctl_lock); |
1924 | start_unregistering(header); | |
ae7edecc AV |
1925 | if (!--header->parent->count) { |
1926 | WARN_ON(1); | |
1927 | kfree(header->parent); | |
1928 | } | |
f7e6ced4 AV |
1929 | if (!--header->count) |
1930 | kfree(header); | |
330d57fb | 1931 | spin_unlock(&sysctl_lock); |
1da177e4 LT |
1932 | } |
1933 | ||
9043476f AV |
1934 | int sysctl_is_seen(struct ctl_table_header *p) |
1935 | { | |
1936 | struct ctl_table_set *set = p->set; | |
1937 | int res; | |
1938 | spin_lock(&sysctl_lock); | |
1939 | if (p->unregistering) | |
1940 | res = 0; | |
1941 | else if (!set->is_seen) | |
1942 | res = 1; | |
1943 | else | |
1944 | res = set->is_seen(set); | |
1945 | spin_unlock(&sysctl_lock); | |
1946 | return res; | |
1947 | } | |
1948 | ||
73455092 AV |
1949 | void setup_sysctl_set(struct ctl_table_set *p, |
1950 | struct ctl_table_set *parent, | |
1951 | int (*is_seen)(struct ctl_table_set *)) | |
1952 | { | |
1953 | INIT_LIST_HEAD(&p->list); | |
1954 | p->parent = parent ? parent : &sysctl_table_root.default_set; | |
1955 | p->is_seen = is_seen; | |
1956 | } | |
1957 | ||
b89a8171 | 1958 | #else /* !CONFIG_SYSCTL */ |
d8217f07 | 1959 | struct ctl_table_header *register_sysctl_table(struct ctl_table * table) |
b89a8171 EB |
1960 | { |
1961 | return NULL; | |
1962 | } | |
1963 | ||
29e796fd EB |
1964 | struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path, |
1965 | struct ctl_table *table) | |
1966 | { | |
1967 | return NULL; | |
1968 | } | |
1969 | ||
b89a8171 EB |
1970 | void unregister_sysctl_table(struct ctl_table_header * table) |
1971 | { | |
1972 | } | |
1973 | ||
73455092 AV |
1974 | void setup_sysctl_set(struct ctl_table_set *p, |
1975 | struct ctl_table_set *parent, | |
1976 | int (*is_seen)(struct ctl_table_set *)) | |
1977 | { | |
1978 | } | |
1979 | ||
f7e6ced4 AV |
1980 | void sysctl_head_put(struct ctl_table_header *head) |
1981 | { | |
1982 | } | |
1983 | ||
b89a8171 EB |
1984 | #endif /* CONFIG_SYSCTL */ |
1985 | ||
1da177e4 LT |
1986 | /* |
1987 | * /proc/sys support | |
1988 | */ | |
1989 | ||
b89a8171 | 1990 | #ifdef CONFIG_PROC_SYSCTL |
1da177e4 | 1991 | |
b1ba4ddd | 1992 | static int _proc_do_string(void* data, int maxlen, int write, |
8d65af78 | 1993 | void __user *buffer, |
b1ba4ddd | 1994 | size_t *lenp, loff_t *ppos) |
1da177e4 LT |
1995 | { |
1996 | size_t len; | |
1997 | char __user *p; | |
1998 | char c; | |
8d060877 ON |
1999 | |
2000 | if (!data || !maxlen || !*lenp) { | |
1da177e4 LT |
2001 | *lenp = 0; |
2002 | return 0; | |
2003 | } | |
8d060877 | 2004 | |
1da177e4 LT |
2005 | if (write) { |
2006 | len = 0; | |
2007 | p = buffer; | |
2008 | while (len < *lenp) { | |
2009 | if (get_user(c, p++)) | |
2010 | return -EFAULT; | |
2011 | if (c == 0 || c == '\n') | |
2012 | break; | |
2013 | len++; | |
2014 | } | |
f5dd3d6f SV |
2015 | if (len >= maxlen) |
2016 | len = maxlen-1; | |
2017 | if(copy_from_user(data, buffer, len)) | |
1da177e4 | 2018 | return -EFAULT; |
f5dd3d6f | 2019 | ((char *) data)[len] = 0; |
1da177e4 LT |
2020 | *ppos += *lenp; |
2021 | } else { | |
f5dd3d6f SV |
2022 | len = strlen(data); |
2023 | if (len > maxlen) | |
2024 | len = maxlen; | |
8d060877 ON |
2025 | |
2026 | if (*ppos > len) { | |
2027 | *lenp = 0; | |
2028 | return 0; | |
2029 | } | |
2030 | ||
2031 | data += *ppos; | |
2032 | len -= *ppos; | |
2033 | ||
1da177e4 LT |
2034 | if (len > *lenp) |
2035 | len = *lenp; | |
2036 | if (len) | |
f5dd3d6f | 2037 | if(copy_to_user(buffer, data, len)) |
1da177e4 LT |
2038 | return -EFAULT; |
2039 | if (len < *lenp) { | |
2040 | if(put_user('\n', ((char __user *) buffer) + len)) | |
2041 | return -EFAULT; | |
2042 | len++; | |
2043 | } | |
2044 | *lenp = len; | |
2045 | *ppos += len; | |
2046 | } | |
2047 | return 0; | |
2048 | } | |
2049 | ||
f5dd3d6f SV |
2050 | /** |
2051 | * proc_dostring - read a string sysctl | |
2052 | * @table: the sysctl table | |
2053 | * @write: %TRUE if this is a write to the sysctl file | |
f5dd3d6f SV |
2054 | * @buffer: the user buffer |
2055 | * @lenp: the size of the user buffer | |
2056 | * @ppos: file position | |
2057 | * | |
2058 | * Reads/writes a string from/to the user buffer. If the kernel | |
2059 | * buffer provided is not large enough to hold the string, the | |
2060 | * string is truncated. The copied string is %NULL-terminated. | |
2061 | * If the string is being read by the user process, it is copied | |
2062 | * and a newline '\n' is added. It is truncated if the buffer is | |
2063 | * not large enough. | |
2064 | * | |
2065 | * Returns 0 on success. | |
2066 | */ | |
8d65af78 | 2067 | int proc_dostring(struct ctl_table *table, int write, |
f5dd3d6f SV |
2068 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2069 | { | |
8d65af78 | 2070 | return _proc_do_string(table->data, table->maxlen, write, |
f5dd3d6f SV |
2071 | buffer, lenp, ppos); |
2072 | } | |
2073 | ||
00b7c339 AW |
2074 | static size_t proc_skip_spaces(char **buf) |
2075 | { | |
2076 | size_t ret; | |
2077 | char *tmp = skip_spaces(*buf); | |
2078 | ret = tmp - *buf; | |
2079 | *buf = tmp; | |
2080 | return ret; | |
2081 | } | |
2082 | ||
9f977fb7 OP |
2083 | static void proc_skip_char(char **buf, size_t *size, const char v) |
2084 | { | |
2085 | while (*size) { | |
2086 | if (**buf != v) | |
2087 | break; | |
2088 | (*size)--; | |
2089 | (*buf)++; | |
2090 | } | |
2091 | } | |
2092 | ||
00b7c339 AW |
2093 | #define TMPBUFLEN 22 |
2094 | /** | |
0fc377bd | 2095 | * proc_get_long - reads an ASCII formatted integer from a user buffer |
00b7c339 | 2096 | * |
0fc377bd RD |
2097 | * @buf: a kernel buffer |
2098 | * @size: size of the kernel buffer | |
2099 | * @val: this is where the number will be stored | |
2100 | * @neg: set to %TRUE if number is negative | |
2101 | * @perm_tr: a vector which contains the allowed trailers | |
2102 | * @perm_tr_len: size of the perm_tr vector | |
2103 | * @tr: pointer to store the trailer character | |
00b7c339 | 2104 | * |
0fc377bd RD |
2105 | * In case of success %0 is returned and @buf and @size are updated with |
2106 | * the amount of bytes read. If @tr is non-NULL and a trailing | |
2107 | * character exists (size is non-zero after returning from this | |
2108 | * function), @tr is updated with the trailing character. | |
00b7c339 AW |
2109 | */ |
2110 | static int proc_get_long(char **buf, size_t *size, | |
2111 | unsigned long *val, bool *neg, | |
2112 | const char *perm_tr, unsigned perm_tr_len, char *tr) | |
2113 | { | |
2114 | int len; | |
2115 | char *p, tmp[TMPBUFLEN]; | |
2116 | ||
2117 | if (!*size) | |
2118 | return -EINVAL; | |
2119 | ||
2120 | len = *size; | |
2121 | if (len > TMPBUFLEN - 1) | |
2122 | len = TMPBUFLEN - 1; | |
2123 | ||
2124 | memcpy(tmp, *buf, len); | |
2125 | ||
2126 | tmp[len] = 0; | |
2127 | p = tmp; | |
2128 | if (*p == '-' && *size > 1) { | |
2129 | *neg = true; | |
2130 | p++; | |
2131 | } else | |
2132 | *neg = false; | |
2133 | if (!isdigit(*p)) | |
2134 | return -EINVAL; | |
2135 | ||
2136 | *val = simple_strtoul(p, &p, 0); | |
2137 | ||
2138 | len = p - tmp; | |
2139 | ||
2140 | /* We don't know if the next char is whitespace thus we may accept | |
2141 | * invalid integers (e.g. 1234...a) or two integers instead of one | |
2142 | * (e.g. 123...1). So lets not allow such large numbers. */ | |
2143 | if (len == TMPBUFLEN - 1) | |
2144 | return -EINVAL; | |
2145 | ||
2146 | if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len)) | |
2147 | return -EINVAL; | |
1da177e4 | 2148 | |
00b7c339 AW |
2149 | if (tr && (len < *size)) |
2150 | *tr = *p; | |
2151 | ||
2152 | *buf += len; | |
2153 | *size -= len; | |
2154 | ||
2155 | return 0; | |
2156 | } | |
2157 | ||
2158 | /** | |
0fc377bd | 2159 | * proc_put_long - converts an integer to a decimal ASCII formatted string |
00b7c339 | 2160 | * |
0fc377bd RD |
2161 | * @buf: the user buffer |
2162 | * @size: the size of the user buffer | |
2163 | * @val: the integer to be converted | |
2164 | * @neg: sign of the number, %TRUE for negative | |
00b7c339 | 2165 | * |
0fc377bd RD |
2166 | * In case of success %0 is returned and @buf and @size are updated with |
2167 | * the amount of bytes written. | |
00b7c339 AW |
2168 | */ |
2169 | static int proc_put_long(void __user **buf, size_t *size, unsigned long val, | |
2170 | bool neg) | |
2171 | { | |
2172 | int len; | |
2173 | char tmp[TMPBUFLEN], *p = tmp; | |
2174 | ||
2175 | sprintf(p, "%s%lu", neg ? "-" : "", val); | |
2176 | len = strlen(tmp); | |
2177 | if (len > *size) | |
2178 | len = *size; | |
2179 | if (copy_to_user(*buf, tmp, len)) | |
2180 | return -EFAULT; | |
2181 | *size -= len; | |
2182 | *buf += len; | |
2183 | return 0; | |
2184 | } | |
2185 | #undef TMPBUFLEN | |
2186 | ||
2187 | static int proc_put_char(void __user **buf, size_t *size, char c) | |
2188 | { | |
2189 | if (*size) { | |
2190 | char __user **buffer = (char __user **)buf; | |
2191 | if (put_user(c, *buffer)) | |
2192 | return -EFAULT; | |
2193 | (*size)--, (*buffer)++; | |
2194 | *buf = *buffer; | |
2195 | } | |
2196 | return 0; | |
2197 | } | |
1da177e4 | 2198 | |
00b7c339 | 2199 | static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp, |
1da177e4 LT |
2200 | int *valp, |
2201 | int write, void *data) | |
2202 | { | |
2203 | if (write) { | |
2204 | *valp = *negp ? -*lvalp : *lvalp; | |
2205 | } else { | |
2206 | int val = *valp; | |
2207 | if (val < 0) { | |
00b7c339 | 2208 | *negp = true; |
1da177e4 LT |
2209 | *lvalp = (unsigned long)-val; |
2210 | } else { | |
00b7c339 | 2211 | *negp = false; |
1da177e4 LT |
2212 | *lvalp = (unsigned long)val; |
2213 | } | |
2214 | } | |
2215 | return 0; | |
2216 | } | |
2217 | ||
00b7c339 AW |
2218 | static const char proc_wspace_sep[] = { ' ', '\t', '\n' }; |
2219 | ||
d8217f07 | 2220 | static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table, |
8d65af78 | 2221 | int write, void __user *buffer, |
fcfbd547 | 2222 | size_t *lenp, loff_t *ppos, |
00b7c339 | 2223 | int (*conv)(bool *negp, unsigned long *lvalp, int *valp, |
1da177e4 LT |
2224 | int write, void *data), |
2225 | void *data) | |
2226 | { | |
00b7c339 AW |
2227 | int *i, vleft, first = 1, err = 0; |
2228 | unsigned long page = 0; | |
2229 | size_t left; | |
2230 | char *kbuf; | |
1da177e4 | 2231 | |
00b7c339 | 2232 | if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) { |
1da177e4 LT |
2233 | *lenp = 0; |
2234 | return 0; | |
2235 | } | |
2236 | ||
fcfbd547 | 2237 | i = (int *) tbl_data; |
1da177e4 LT |
2238 | vleft = table->maxlen / sizeof(*i); |
2239 | left = *lenp; | |
2240 | ||
2241 | if (!conv) | |
2242 | conv = do_proc_dointvec_conv; | |
2243 | ||
00b7c339 AW |
2244 | if (write) { |
2245 | if (left > PAGE_SIZE - 1) | |
2246 | left = PAGE_SIZE - 1; | |
2247 | page = __get_free_page(GFP_TEMPORARY); | |
2248 | kbuf = (char *) page; | |
2249 | if (!kbuf) | |
2250 | return -ENOMEM; | |
2251 | if (copy_from_user(kbuf, buffer, left)) { | |
2252 | err = -EFAULT; | |
2253 | goto free; | |
2254 | } | |
2255 | kbuf[left] = 0; | |
2256 | } | |
2257 | ||
1da177e4 | 2258 | for (; left && vleft--; i++, first=0) { |
00b7c339 AW |
2259 | unsigned long lval; |
2260 | bool neg; | |
1da177e4 | 2261 | |
00b7c339 AW |
2262 | if (write) { |
2263 | left -= proc_skip_spaces(&kbuf); | |
1da177e4 | 2264 | |
00b7c339 AW |
2265 | err = proc_get_long(&kbuf, &left, &lval, &neg, |
2266 | proc_wspace_sep, | |
2267 | sizeof(proc_wspace_sep), NULL); | |
2268 | if (err) | |
1da177e4 | 2269 | break; |
00b7c339 AW |
2270 | if (conv(&neg, &lval, i, 1, data)) { |
2271 | err = -EINVAL; | |
1da177e4 | 2272 | break; |
00b7c339 | 2273 | } |
1da177e4 | 2274 | } else { |
00b7c339 AW |
2275 | if (conv(&neg, &lval, i, 0, data)) { |
2276 | err = -EINVAL; | |
2277 | break; | |
2278 | } | |
1da177e4 | 2279 | if (!first) |
00b7c339 AW |
2280 | err = proc_put_char(&buffer, &left, '\t'); |
2281 | if (err) | |
2282 | break; | |
2283 | err = proc_put_long(&buffer, &left, lval, neg); | |
2284 | if (err) | |
1da177e4 | 2285 | break; |
1da177e4 LT |
2286 | } |
2287 | } | |
2288 | ||
00b7c339 AW |
2289 | if (!write && !first && left && !err) |
2290 | err = proc_put_char(&buffer, &left, '\n'); | |
2291 | if (write && !err) | |
2292 | left -= proc_skip_spaces(&kbuf); | |
2293 | free: | |
1da177e4 | 2294 | if (write) { |
00b7c339 AW |
2295 | free_page(page); |
2296 | if (first) | |
2297 | return err ? : -EINVAL; | |
1da177e4 | 2298 | } |
1da177e4 LT |
2299 | *lenp -= left; |
2300 | *ppos += *lenp; | |
00b7c339 | 2301 | return err; |
1da177e4 LT |
2302 | } |
2303 | ||
8d65af78 | 2304 | static int do_proc_dointvec(struct ctl_table *table, int write, |
fcfbd547 | 2305 | void __user *buffer, size_t *lenp, loff_t *ppos, |
00b7c339 | 2306 | int (*conv)(bool *negp, unsigned long *lvalp, int *valp, |
fcfbd547 KK |
2307 | int write, void *data), |
2308 | void *data) | |
2309 | { | |
8d65af78 | 2310 | return __do_proc_dointvec(table->data, table, write, |
fcfbd547 KK |
2311 | buffer, lenp, ppos, conv, data); |
2312 | } | |
2313 | ||
1da177e4 LT |
2314 | /** |
2315 | * proc_dointvec - read a vector of integers | |
2316 | * @table: the sysctl table | |
2317 | * @write: %TRUE if this is a write to the sysctl file | |
1da177e4 LT |
2318 | * @buffer: the user buffer |
2319 | * @lenp: the size of the user buffer | |
2320 | * @ppos: file position | |
2321 | * | |
2322 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer | |
2323 | * values from/to the user buffer, treated as an ASCII string. | |
2324 | * | |
2325 | * Returns 0 on success. | |
2326 | */ | |
8d65af78 | 2327 | int proc_dointvec(struct ctl_table *table, int write, |
1da177e4 LT |
2328 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2329 | { | |
8d65af78 | 2330 | return do_proc_dointvec(table,write,buffer,lenp,ppos, |
1da177e4 LT |
2331 | NULL,NULL); |
2332 | } | |
2333 | ||
34f5a398 | 2334 | /* |
25ddbb18 AK |
2335 | * Taint values can only be increased |
2336 | * This means we can safely use a temporary. | |
34f5a398 | 2337 | */ |
8d65af78 | 2338 | static int proc_taint(struct ctl_table *table, int write, |
34f5a398 TT |
2339 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2340 | { | |
25ddbb18 AK |
2341 | struct ctl_table t; |
2342 | unsigned long tmptaint = get_taint(); | |
2343 | int err; | |
34f5a398 | 2344 | |
91fcd412 | 2345 | if (write && !capable(CAP_SYS_ADMIN)) |
34f5a398 TT |
2346 | return -EPERM; |
2347 | ||
25ddbb18 AK |
2348 | t = *table; |
2349 | t.data = &tmptaint; | |
8d65af78 | 2350 | err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos); |
25ddbb18 AK |
2351 | if (err < 0) |
2352 | return err; | |
2353 | ||
2354 | if (write) { | |
2355 | /* | |
2356 | * Poor man's atomic or. Not worth adding a primitive | |
2357 | * to everyone's atomic.h for this | |
2358 | */ | |
2359 | int i; | |
2360 | for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) { | |
2361 | if ((tmptaint >> i) & 1) | |
2362 | add_taint(i); | |
2363 | } | |
2364 | } | |
2365 | ||
2366 | return err; | |
34f5a398 TT |
2367 | } |
2368 | ||
1da177e4 LT |
2369 | struct do_proc_dointvec_minmax_conv_param { |
2370 | int *min; | |
2371 | int *max; | |
2372 | }; | |
2373 | ||
00b7c339 AW |
2374 | static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp, |
2375 | int *valp, | |
1da177e4 LT |
2376 | int write, void *data) |
2377 | { | |
2378 | struct do_proc_dointvec_minmax_conv_param *param = data; | |
2379 | if (write) { | |
2380 | int val = *negp ? -*lvalp : *lvalp; | |
2381 | if ((param->min && *param->min > val) || | |
2382 | (param->max && *param->max < val)) | |
2383 | return -EINVAL; | |
2384 | *valp = val; | |
2385 | } else { | |
2386 | int val = *valp; | |
2387 | if (val < 0) { | |
00b7c339 | 2388 | *negp = true; |
1da177e4 LT |
2389 | *lvalp = (unsigned long)-val; |
2390 | } else { | |
00b7c339 | 2391 | *negp = false; |
1da177e4 LT |
2392 | *lvalp = (unsigned long)val; |
2393 | } | |
2394 | } | |
2395 | return 0; | |
2396 | } | |
2397 | ||
2398 | /** | |
2399 | * proc_dointvec_minmax - read a vector of integers with min/max values | |
2400 | * @table: the sysctl table | |
2401 | * @write: %TRUE if this is a write to the sysctl file | |
1da177e4 LT |
2402 | * @buffer: the user buffer |
2403 | * @lenp: the size of the user buffer | |
2404 | * @ppos: file position | |
2405 | * | |
2406 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer | |
2407 | * values from/to the user buffer, treated as an ASCII string. | |
2408 | * | |
2409 | * This routine will ensure the values are within the range specified by | |
2410 | * table->extra1 (min) and table->extra2 (max). | |
2411 | * | |
2412 | * Returns 0 on success. | |
2413 | */ | |
8d65af78 | 2414 | int proc_dointvec_minmax(struct ctl_table *table, int write, |
1da177e4 LT |
2415 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2416 | { | |
2417 | struct do_proc_dointvec_minmax_conv_param param = { | |
2418 | .min = (int *) table->extra1, | |
2419 | .max = (int *) table->extra2, | |
2420 | }; | |
8d65af78 | 2421 | return do_proc_dointvec(table, write, buffer, lenp, ppos, |
1da177e4 LT |
2422 | do_proc_dointvec_minmax_conv, ¶m); |
2423 | } | |
2424 | ||
d8217f07 | 2425 | static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write, |
1da177e4 LT |
2426 | void __user *buffer, |
2427 | size_t *lenp, loff_t *ppos, | |
2428 | unsigned long convmul, | |
2429 | unsigned long convdiv) | |
2430 | { | |
00b7c339 AW |
2431 | unsigned long *i, *min, *max; |
2432 | int vleft, first = 1, err = 0; | |
2433 | unsigned long page = 0; | |
2434 | size_t left; | |
2435 | char *kbuf; | |
2436 | ||
2437 | if (!data || !table->maxlen || !*lenp || (*ppos && !write)) { | |
1da177e4 LT |
2438 | *lenp = 0; |
2439 | return 0; | |
2440 | } | |
00b7c339 | 2441 | |
fcfbd547 | 2442 | i = (unsigned long *) data; |
1da177e4 LT |
2443 | min = (unsigned long *) table->extra1; |
2444 | max = (unsigned long *) table->extra2; | |
2445 | vleft = table->maxlen / sizeof(unsigned long); | |
2446 | left = *lenp; | |
00b7c339 AW |
2447 | |
2448 | if (write) { | |
2449 | if (left > PAGE_SIZE - 1) | |
2450 | left = PAGE_SIZE - 1; | |
2451 | page = __get_free_page(GFP_TEMPORARY); | |
2452 | kbuf = (char *) page; | |
2453 | if (!kbuf) | |
2454 | return -ENOMEM; | |
2455 | if (copy_from_user(kbuf, buffer, left)) { | |
2456 | err = -EFAULT; | |
2457 | goto free; | |
2458 | } | |
2459 | kbuf[left] = 0; | |
2460 | } | |
2461 | ||
1da177e4 | 2462 | for (; left && vleft--; i++, min++, max++, first=0) { |
00b7c339 AW |
2463 | unsigned long val; |
2464 | ||
1da177e4 | 2465 | if (write) { |
00b7c339 AW |
2466 | bool neg; |
2467 | ||
2468 | left -= proc_skip_spaces(&kbuf); | |
2469 | ||
2470 | err = proc_get_long(&kbuf, &left, &val, &neg, | |
2471 | proc_wspace_sep, | |
2472 | sizeof(proc_wspace_sep), NULL); | |
2473 | if (err) | |
1da177e4 LT |
2474 | break; |
2475 | if (neg) | |
1da177e4 LT |
2476 | continue; |
2477 | if ((min && val < *min) || (max && val > *max)) | |
2478 | continue; | |
2479 | *i = val; | |
2480 | } else { | |
00b7c339 | 2481 | val = convdiv * (*i) / convmul; |
1da177e4 | 2482 | if (!first) |
00b7c339 AW |
2483 | err = proc_put_char(&buffer, &left, '\t'); |
2484 | err = proc_put_long(&buffer, &left, val, false); | |
2485 | if (err) | |
2486 | break; | |
1da177e4 LT |
2487 | } |
2488 | } | |
2489 | ||
00b7c339 AW |
2490 | if (!write && !first && left && !err) |
2491 | err = proc_put_char(&buffer, &left, '\n'); | |
2492 | if (write && !err) | |
2493 | left -= proc_skip_spaces(&kbuf); | |
2494 | free: | |
1da177e4 | 2495 | if (write) { |
00b7c339 AW |
2496 | free_page(page); |
2497 | if (first) | |
2498 | return err ? : -EINVAL; | |
1da177e4 | 2499 | } |
1da177e4 LT |
2500 | *lenp -= left; |
2501 | *ppos += *lenp; | |
00b7c339 | 2502 | return err; |
1da177e4 LT |
2503 | } |
2504 | ||
d8217f07 | 2505 | static int do_proc_doulongvec_minmax(struct ctl_table *table, int write, |
fcfbd547 KK |
2506 | void __user *buffer, |
2507 | size_t *lenp, loff_t *ppos, | |
2508 | unsigned long convmul, | |
2509 | unsigned long convdiv) | |
2510 | { | |
2511 | return __do_proc_doulongvec_minmax(table->data, table, write, | |
8d65af78 | 2512 | buffer, lenp, ppos, convmul, convdiv); |
fcfbd547 KK |
2513 | } |
2514 | ||
1da177e4 LT |
2515 | /** |
2516 | * proc_doulongvec_minmax - read a vector of long integers with min/max values | |
2517 | * @table: the sysctl table | |
2518 | * @write: %TRUE if this is a write to the sysctl file | |
1da177e4 LT |
2519 | * @buffer: the user buffer |
2520 | * @lenp: the size of the user buffer | |
2521 | * @ppos: file position | |
2522 | * | |
2523 | * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long | |
2524 | * values from/to the user buffer, treated as an ASCII string. | |
2525 | * | |
2526 | * This routine will ensure the values are within the range specified by | |
2527 | * table->extra1 (min) and table->extra2 (max). | |
2528 | * | |
2529 | * Returns 0 on success. | |
2530 | */ | |
8d65af78 | 2531 | int proc_doulongvec_minmax(struct ctl_table *table, int write, |
1da177e4 LT |
2532 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2533 | { | |
8d65af78 | 2534 | return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l); |
1da177e4 LT |
2535 | } |
2536 | ||
2537 | /** | |
2538 | * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values | |
2539 | * @table: the sysctl table | |
2540 | * @write: %TRUE if this is a write to the sysctl file | |
1da177e4 LT |
2541 | * @buffer: the user buffer |
2542 | * @lenp: the size of the user buffer | |
2543 | * @ppos: file position | |
2544 | * | |
2545 | * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long | |
2546 | * values from/to the user buffer, treated as an ASCII string. The values | |
2547 | * are treated as milliseconds, and converted to jiffies when they are stored. | |
2548 | * | |
2549 | * This routine will ensure the values are within the range specified by | |
2550 | * table->extra1 (min) and table->extra2 (max). | |
2551 | * | |
2552 | * Returns 0 on success. | |
2553 | */ | |
d8217f07 | 2554 | int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, |
1da177e4 LT |
2555 | void __user *buffer, |
2556 | size_t *lenp, loff_t *ppos) | |
2557 | { | |
8d65af78 | 2558 | return do_proc_doulongvec_minmax(table, write, buffer, |
1da177e4 LT |
2559 | lenp, ppos, HZ, 1000l); |
2560 | } | |
2561 | ||
2562 | ||
00b7c339 | 2563 | static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp, |
1da177e4 LT |
2564 | int *valp, |
2565 | int write, void *data) | |
2566 | { | |
2567 | if (write) { | |
cba9f33d BS |
2568 | if (*lvalp > LONG_MAX / HZ) |
2569 | return 1; | |
1da177e4 LT |
2570 | *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ); |
2571 | } else { | |
2572 | int val = *valp; | |
2573 | unsigned long lval; | |
2574 | if (val < 0) { | |
00b7c339 | 2575 | *negp = true; |
1da177e4 LT |
2576 | lval = (unsigned long)-val; |
2577 | } else { | |
00b7c339 | 2578 | *negp = false; |
1da177e4 LT |
2579 | lval = (unsigned long)val; |
2580 | } | |
2581 | *lvalp = lval / HZ; | |
2582 | } | |
2583 | return 0; | |
2584 | } | |
2585 | ||
00b7c339 | 2586 | static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp, |
1da177e4 LT |
2587 | int *valp, |
2588 | int write, void *data) | |
2589 | { | |
2590 | if (write) { | |
cba9f33d BS |
2591 | if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ) |
2592 | return 1; | |
1da177e4 LT |
2593 | *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp); |
2594 | } else { | |
2595 | int val = *valp; | |
2596 | unsigned long lval; | |
2597 | if (val < 0) { | |
00b7c339 | 2598 | *negp = true; |
1da177e4 LT |
2599 | lval = (unsigned long)-val; |
2600 | } else { | |
00b7c339 | 2601 | *negp = false; |
1da177e4 LT |
2602 | lval = (unsigned long)val; |
2603 | } | |
2604 | *lvalp = jiffies_to_clock_t(lval); | |
2605 | } | |
2606 | return 0; | |
2607 | } | |
2608 | ||
00b7c339 | 2609 | static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp, |
1da177e4 LT |
2610 | int *valp, |
2611 | int write, void *data) | |
2612 | { | |
2613 | if (write) { | |
2614 | *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp); | |
2615 | } else { | |
2616 | int val = *valp; | |
2617 | unsigned long lval; | |
2618 | if (val < 0) { | |
00b7c339 | 2619 | *negp = true; |
1da177e4 LT |
2620 | lval = (unsigned long)-val; |
2621 | } else { | |
00b7c339 | 2622 | *negp = false; |
1da177e4 LT |
2623 | lval = (unsigned long)val; |
2624 | } | |
2625 | *lvalp = jiffies_to_msecs(lval); | |
2626 | } | |
2627 | return 0; | |
2628 | } | |
2629 | ||
2630 | /** | |
2631 | * proc_dointvec_jiffies - read a vector of integers as seconds | |
2632 | * @table: the sysctl table | |
2633 | * @write: %TRUE if this is a write to the sysctl file | |
1da177e4 LT |
2634 | * @buffer: the user buffer |
2635 | * @lenp: the size of the user buffer | |
2636 | * @ppos: file position | |
2637 | * | |
2638 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer | |
2639 | * values from/to the user buffer, treated as an ASCII string. | |
2640 | * The values read are assumed to be in seconds, and are converted into | |
2641 | * jiffies. | |
2642 | * | |
2643 | * Returns 0 on success. | |
2644 | */ | |
8d65af78 | 2645 | int proc_dointvec_jiffies(struct ctl_table *table, int write, |
1da177e4 LT |
2646 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2647 | { | |
8d65af78 | 2648 | return do_proc_dointvec(table,write,buffer,lenp,ppos, |
1da177e4 LT |
2649 | do_proc_dointvec_jiffies_conv,NULL); |
2650 | } | |
2651 | ||
2652 | /** | |
2653 | * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds | |
2654 | * @table: the sysctl table | |
2655 | * @write: %TRUE if this is a write to the sysctl file | |
1da177e4 LT |
2656 | * @buffer: the user buffer |
2657 | * @lenp: the size of the user buffer | |
1e5d5331 | 2658 | * @ppos: pointer to the file position |
1da177e4 LT |
2659 | * |
2660 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer | |
2661 | * values from/to the user buffer, treated as an ASCII string. | |
2662 | * The values read are assumed to be in 1/USER_HZ seconds, and | |
2663 | * are converted into jiffies. | |
2664 | * | |
2665 | * Returns 0 on success. | |
2666 | */ | |
8d65af78 | 2667 | int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, |
1da177e4 LT |
2668 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2669 | { | |
8d65af78 | 2670 | return do_proc_dointvec(table,write,buffer,lenp,ppos, |
1da177e4 LT |
2671 | do_proc_dointvec_userhz_jiffies_conv,NULL); |
2672 | } | |
2673 | ||
2674 | /** | |
2675 | * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds | |
2676 | * @table: the sysctl table | |
2677 | * @write: %TRUE if this is a write to the sysctl file | |
1da177e4 LT |
2678 | * @buffer: the user buffer |
2679 | * @lenp: the size of the user buffer | |
67be2dd1 MW |
2680 | * @ppos: file position |
2681 | * @ppos: the current position in the file | |
1da177e4 LT |
2682 | * |
2683 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer | |
2684 | * values from/to the user buffer, treated as an ASCII string. | |
2685 | * The values read are assumed to be in 1/1000 seconds, and | |
2686 | * are converted into jiffies. | |
2687 | * | |
2688 | * Returns 0 on success. | |
2689 | */ | |
8d65af78 | 2690 | int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, |
1da177e4 LT |
2691 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2692 | { | |
8d65af78 | 2693 | return do_proc_dointvec(table, write, buffer, lenp, ppos, |
1da177e4 LT |
2694 | do_proc_dointvec_ms_jiffies_conv, NULL); |
2695 | } | |
2696 | ||
8d65af78 | 2697 | static int proc_do_cad_pid(struct ctl_table *table, int write, |
9ec52099 CLG |
2698 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2699 | { | |
2700 | struct pid *new_pid; | |
2701 | pid_t tmp; | |
2702 | int r; | |
2703 | ||
6c5f3e7b | 2704 | tmp = pid_vnr(cad_pid); |
9ec52099 | 2705 | |
8d65af78 | 2706 | r = __do_proc_dointvec(&tmp, table, write, buffer, |
9ec52099 CLG |
2707 | lenp, ppos, NULL, NULL); |
2708 | if (r || !write) | |
2709 | return r; | |
2710 | ||
2711 | new_pid = find_get_pid(tmp); | |
2712 | if (!new_pid) | |
2713 | return -ESRCH; | |
2714 | ||
2715 | put_pid(xchg(&cad_pid, new_pid)); | |
2716 | return 0; | |
2717 | } | |
2718 | ||
9f977fb7 OP |
2719 | /** |
2720 | * proc_do_large_bitmap - read/write from/to a large bitmap | |
2721 | * @table: the sysctl table | |
2722 | * @write: %TRUE if this is a write to the sysctl file | |
2723 | * @buffer: the user buffer | |
2724 | * @lenp: the size of the user buffer | |
2725 | * @ppos: file position | |
2726 | * | |
2727 | * The bitmap is stored at table->data and the bitmap length (in bits) | |
2728 | * in table->maxlen. | |
2729 | * | |
2730 | * We use a range comma separated format (e.g. 1,3-4,10-10) so that | |
2731 | * large bitmaps may be represented in a compact manner. Writing into | |
2732 | * the file will clear the bitmap then update it with the given input. | |
2733 | * | |
2734 | * Returns 0 on success. | |
2735 | */ | |
2736 | int proc_do_large_bitmap(struct ctl_table *table, int write, | |
2737 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2738 | { | |
2739 | int err = 0; | |
2740 | bool first = 1; | |
2741 | size_t left = *lenp; | |
2742 | unsigned long bitmap_len = table->maxlen; | |
2743 | unsigned long *bitmap = (unsigned long *) table->data; | |
2744 | unsigned long *tmp_bitmap = NULL; | |
2745 | char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c; | |
2746 | ||
2747 | if (!bitmap_len || !left || (*ppos && !write)) { | |
2748 | *lenp = 0; | |
2749 | return 0; | |
2750 | } | |
2751 | ||
2752 | if (write) { | |
2753 | unsigned long page = 0; | |
2754 | char *kbuf; | |
2755 | ||
2756 | if (left > PAGE_SIZE - 1) | |
2757 | left = PAGE_SIZE - 1; | |
2758 | ||
2759 | page = __get_free_page(GFP_TEMPORARY); | |
2760 | kbuf = (char *) page; | |
2761 | if (!kbuf) | |
2762 | return -ENOMEM; | |
2763 | if (copy_from_user(kbuf, buffer, left)) { | |
2764 | free_page(page); | |
2765 | return -EFAULT; | |
2766 | } | |
2767 | kbuf[left] = 0; | |
2768 | ||
2769 | tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long), | |
2770 | GFP_KERNEL); | |
2771 | if (!tmp_bitmap) { | |
2772 | free_page(page); | |
2773 | return -ENOMEM; | |
2774 | } | |
2775 | proc_skip_char(&kbuf, &left, '\n'); | |
2776 | while (!err && left) { | |
2777 | unsigned long val_a, val_b; | |
2778 | bool neg; | |
2779 | ||
2780 | err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a, | |
2781 | sizeof(tr_a), &c); | |
2782 | if (err) | |
2783 | break; | |
2784 | if (val_a >= bitmap_len || neg) { | |
2785 | err = -EINVAL; | |
2786 | break; | |
2787 | } | |
2788 | ||
2789 | val_b = val_a; | |
2790 | if (left) { | |
2791 | kbuf++; | |
2792 | left--; | |
2793 | } | |
2794 | ||
2795 | if (c == '-') { | |
2796 | err = proc_get_long(&kbuf, &left, &val_b, | |
2797 | &neg, tr_b, sizeof(tr_b), | |
2798 | &c); | |
2799 | if (err) | |
2800 | break; | |
2801 | if (val_b >= bitmap_len || neg || | |
2802 | val_a > val_b) { | |
2803 | err = -EINVAL; | |
2804 | break; | |
2805 | } | |
2806 | if (left) { | |
2807 | kbuf++; | |
2808 | left--; | |
2809 | } | |
2810 | } | |
2811 | ||
2812 | while (val_a <= val_b) | |
2813 | set_bit(val_a++, tmp_bitmap); | |
2814 | ||
2815 | first = 0; | |
2816 | proc_skip_char(&kbuf, &left, '\n'); | |
2817 | } | |
2818 | free_page(page); | |
2819 | } else { | |
2820 | unsigned long bit_a, bit_b = 0; | |
2821 | ||
2822 | while (left) { | |
2823 | bit_a = find_next_bit(bitmap, bitmap_len, bit_b); | |
2824 | if (bit_a >= bitmap_len) | |
2825 | break; | |
2826 | bit_b = find_next_zero_bit(bitmap, bitmap_len, | |
2827 | bit_a + 1) - 1; | |
2828 | ||
2829 | if (!first) { | |
2830 | err = proc_put_char(&buffer, &left, ','); | |
2831 | if (err) | |
2832 | break; | |
2833 | } | |
2834 | err = proc_put_long(&buffer, &left, bit_a, false); | |
2835 | if (err) | |
2836 | break; | |
2837 | if (bit_a != bit_b) { | |
2838 | err = proc_put_char(&buffer, &left, '-'); | |
2839 | if (err) | |
2840 | break; | |
2841 | err = proc_put_long(&buffer, &left, bit_b, false); | |
2842 | if (err) | |
2843 | break; | |
2844 | } | |
2845 | ||
2846 | first = 0; bit_b++; | |
2847 | } | |
2848 | if (!err) | |
2849 | err = proc_put_char(&buffer, &left, '\n'); | |
2850 | } | |
2851 | ||
2852 | if (!err) { | |
2853 | if (write) { | |
2854 | if (*ppos) | |
2855 | bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len); | |
2856 | else | |
2857 | memcpy(bitmap, tmp_bitmap, | |
2858 | BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long)); | |
2859 | } | |
2860 | kfree(tmp_bitmap); | |
2861 | *lenp -= left; | |
2862 | *ppos += *lenp; | |
2863 | return 0; | |
2864 | } else { | |
2865 | kfree(tmp_bitmap); | |
2866 | return err; | |
2867 | } | |
2868 | } | |
2869 | ||
1da177e4 LT |
2870 | #else /* CONFIG_PROC_FS */ |
2871 | ||
8d65af78 | 2872 | int proc_dostring(struct ctl_table *table, int write, |
1da177e4 LT |
2873 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2874 | { | |
2875 | return -ENOSYS; | |
2876 | } | |
2877 | ||
8d65af78 | 2878 | int proc_dointvec(struct ctl_table *table, int write, |
1da177e4 | 2879 | void __user *buffer, size_t *lenp, loff_t *ppos) |
1da177e4 LT |
2880 | { |
2881 | return -ENOSYS; | |
2882 | } | |
2883 | ||
8d65af78 | 2884 | int proc_dointvec_minmax(struct ctl_table *table, int write, |
1da177e4 LT |
2885 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2886 | { | |
2887 | return -ENOSYS; | |
2888 | } | |
2889 | ||
8d65af78 | 2890 | int proc_dointvec_jiffies(struct ctl_table *table, int write, |
1da177e4 LT |
2891 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2892 | { | |
2893 | return -ENOSYS; | |
2894 | } | |
2895 | ||
8d65af78 | 2896 | int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, |
1da177e4 LT |
2897 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2898 | { | |
2899 | return -ENOSYS; | |
2900 | } | |
2901 | ||
8d65af78 | 2902 | int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, |
1da177e4 LT |
2903 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2904 | { | |
2905 | return -ENOSYS; | |
2906 | } | |
2907 | ||
8d65af78 | 2908 | int proc_doulongvec_minmax(struct ctl_table *table, int write, |
1da177e4 LT |
2909 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2910 | { | |
2911 | return -ENOSYS; | |
2912 | } | |
2913 | ||
d8217f07 | 2914 | int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, |
1da177e4 LT |
2915 | void __user *buffer, |
2916 | size_t *lenp, loff_t *ppos) | |
2917 | { | |
2918 | return -ENOSYS; | |
2919 | } | |
2920 | ||
2921 | ||
2922 | #endif /* CONFIG_PROC_FS */ | |
2923 | ||
1da177e4 LT |
2924 | /* |
2925 | * No sense putting this after each symbol definition, twice, | |
2926 | * exception granted :-) | |
2927 | */ | |
2928 | EXPORT_SYMBOL(proc_dointvec); | |
2929 | EXPORT_SYMBOL(proc_dointvec_jiffies); | |
2930 | EXPORT_SYMBOL(proc_dointvec_minmax); | |
2931 | EXPORT_SYMBOL(proc_dointvec_userhz_jiffies); | |
2932 | EXPORT_SYMBOL(proc_dointvec_ms_jiffies); | |
2933 | EXPORT_SYMBOL(proc_dostring); | |
2934 | EXPORT_SYMBOL(proc_doulongvec_minmax); | |
2935 | EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax); | |
2936 | EXPORT_SYMBOL(register_sysctl_table); | |
29e796fd | 2937 | EXPORT_SYMBOL(register_sysctl_paths); |
1da177e4 | 2938 | EXPORT_SYMBOL(unregister_sysctl_table); |