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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> |
76ab0f53 | 40 | #include <linux/compaction.h> |
1da177e4 | 41 | #include <linux/hugetlb.h> |
1da177e4 | 42 | #include <linux/initrd.h> |
0b77f5bf | 43 | #include <linux/key.h> |
1da177e4 LT |
44 | #include <linux/times.h> |
45 | #include <linux/limits.h> | |
46 | #include <linux/dcache.h> | |
47 | #include <linux/syscalls.h> | |
c748e134 | 48 | #include <linux/vmstat.h> |
c255d844 PM |
49 | #include <linux/nfs_fs.h> |
50 | #include <linux/acpi.h> | |
10a0a8d4 | 51 | #include <linux/reboot.h> |
b0fc494f | 52 | #include <linux/ftrace.h> |
12e22c5e | 53 | #include <linux/slow-work.h> |
cdd6c482 | 54 | #include <linux/perf_event.h> |
b2be84df | 55 | #include <linux/kprobes.h> |
b492e95b | 56 | #include <linux/pipe_fs_i.h> |
1da177e4 LT |
57 | |
58 | #include <asm/uaccess.h> | |
59 | #include <asm/processor.h> | |
60 | ||
29cbc78b AK |
61 | #ifdef CONFIG_X86 |
62 | #include <asm/nmi.h> | |
0741f4d2 | 63 | #include <asm/stacktrace.h> |
6e7c4025 | 64 | #include <asm/io.h> |
29cbc78b | 65 | #endif |
c55b7c3e DY |
66 | #ifdef CONFIG_BSD_PROCESS_ACCT |
67 | #include <linux/acct.h> | |
68 | #endif | |
4f0e056f DY |
69 | #ifdef CONFIG_RT_MUTEXES |
70 | #include <linux/rtmutex.h> | |
71 | #endif | |
2edf5e49 DY |
72 | #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT) |
73 | #include <linux/lockdep.h> | |
74 | #endif | |
15485a46 DY |
75 | #ifdef CONFIG_CHR_DEV_SG |
76 | #include <scsi/sg.h> | |
77 | #endif | |
29cbc78b | 78 | |
7058cb02 | 79 | |
1da177e4 LT |
80 | #if defined(CONFIG_SYSCTL) |
81 | ||
82 | /* External variables not in a header file. */ | |
1da177e4 LT |
83 | extern int sysctl_overcommit_memory; |
84 | extern int sysctl_overcommit_ratio; | |
fadd8fbd | 85 | extern int sysctl_panic_on_oom; |
fe071d7e | 86 | extern int sysctl_oom_kill_allocating_task; |
fef1bdd6 | 87 | extern int sysctl_oom_dump_tasks; |
1da177e4 | 88 | extern int max_threads; |
1da177e4 | 89 | extern int core_uses_pid; |
d6e71144 | 90 | extern int suid_dumpable; |
1da177e4 | 91 | extern char core_pattern[]; |
a293980c | 92 | extern unsigned int core_pipe_limit; |
1da177e4 LT |
93 | extern int pid_max; |
94 | extern int min_free_kbytes; | |
1da177e4 | 95 | extern int pid_max_min, pid_max_max; |
9d0243bc | 96 | extern int sysctl_drop_caches; |
8ad4b1fb | 97 | extern int percpu_pagelist_fraction; |
bebfa101 | 98 | extern int compat_log; |
9745512c | 99 | extern int latencytop_enabled; |
eceea0b3 | 100 | extern int sysctl_nr_open_min, sysctl_nr_open_max; |
dd8632a1 PM |
101 | #ifndef CONFIG_MMU |
102 | extern int sysctl_nr_trim_pages; | |
103 | #endif | |
cb684b5b | 104 | #ifdef CONFIG_BLOCK |
5e605b64 | 105 | extern int blk_iopoll_enabled; |
cb684b5b | 106 | #endif |
1da177e4 | 107 | |
c4f3b63f | 108 | /* Constants used for minimum and maximum */ |
195cf453 | 109 | #ifdef CONFIG_DETECT_SOFTLOCKUP |
c4f3b63f | 110 | static int sixty = 60; |
9383d967 | 111 | static int neg_one = -1; |
c4f3b63f RT |
112 | #endif |
113 | ||
c4f3b63f | 114 | static int zero; |
cd5f9a4c LT |
115 | static int __maybe_unused one = 1; |
116 | static int __maybe_unused two = 2; | |
fc3501d4 | 117 | static unsigned long one_ul = 1; |
c4f3b63f | 118 | static int one_hundred = 100; |
af91322e DY |
119 | #ifdef CONFIG_PRINTK |
120 | static int ten_thousand = 10000; | |
121 | #endif | |
c4f3b63f | 122 | |
9e4a5bda AR |
123 | /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */ |
124 | static unsigned long dirty_bytes_min = 2 * PAGE_SIZE; | |
125 | ||
1da177e4 LT |
126 | /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */ |
127 | static int maxolduid = 65535; | |
128 | static int minolduid; | |
8ad4b1fb | 129 | static int min_percpu_pagelist_fract = 8; |
1da177e4 LT |
130 | |
131 | static int ngroups_max = NGROUPS_MAX; | |
132 | ||
72c57ed5 | 133 | #ifdef CONFIG_SPARC |
17f04fbb | 134 | #include <asm/system.h> |
1da177e4 LT |
135 | #endif |
136 | ||
0871420f DM |
137 | #ifdef CONFIG_SPARC64 |
138 | extern int sysctl_tsb_ratio; | |
139 | #endif | |
140 | ||
1da177e4 LT |
141 | #ifdef __hppa__ |
142 | extern int pwrsw_enabled; | |
143 | extern int unaligned_enabled; | |
144 | #endif | |
145 | ||
347a8dc3 | 146 | #ifdef CONFIG_S390 |
1da177e4 LT |
147 | #ifdef CONFIG_MATHEMU |
148 | extern int sysctl_ieee_emulation_warnings; | |
149 | #endif | |
150 | extern int sysctl_userprocess_debug; | |
951f22d5 | 151 | extern int spin_retry; |
1da177e4 LT |
152 | #endif |
153 | ||
d2b176ed JS |
154 | #ifdef CONFIG_IA64 |
155 | extern int no_unaligned_warning; | |
88fc241f | 156 | extern int unaligned_dump_stack; |
d2b176ed JS |
157 | #endif |
158 | ||
3fff4c42 IM |
159 | extern struct ratelimit_state printk_ratelimit_state; |
160 | ||
d6f8ff73 | 161 | #ifdef CONFIG_PROC_SYSCTL |
8d65af78 | 162 | static int proc_do_cad_pid(struct ctl_table *table, int write, |
9ec52099 | 163 | void __user *buffer, size_t *lenp, loff_t *ppos); |
8d65af78 | 164 | static int proc_taint(struct ctl_table *table, int write, |
34f5a398 | 165 | void __user *buffer, size_t *lenp, loff_t *ppos); |
d6f8ff73 | 166 | #endif |
9ec52099 | 167 | |
97f5f0cd DT |
168 | #ifdef CONFIG_MAGIC_SYSRQ |
169 | static int __sysrq_enabled; /* Note: sysrq code ises it's own private copy */ | |
170 | ||
171 | static int sysrq_sysctl_handler(ctl_table *table, int write, | |
172 | void __user *buffer, size_t *lenp, | |
173 | loff_t *ppos) | |
174 | { | |
175 | int error; | |
176 | ||
177 | error = proc_dointvec(table, write, buffer, lenp, ppos); | |
178 | if (error) | |
179 | return error; | |
180 | ||
181 | if (write) | |
182 | sysrq_toggle_support(__sysrq_enabled); | |
183 | ||
184 | return 0; | |
185 | } | |
186 | ||
187 | #endif | |
188 | ||
d8217f07 | 189 | static struct ctl_table root_table[]; |
e51b6ba0 EB |
190 | static struct ctl_table_root sysctl_table_root; |
191 | static struct ctl_table_header root_table_header = { | |
b380b0d4 | 192 | .count = 1, |
e51b6ba0 | 193 | .ctl_table = root_table, |
73455092 | 194 | .ctl_entry = LIST_HEAD_INIT(sysctl_table_root.default_set.list), |
e51b6ba0 | 195 | .root = &sysctl_table_root, |
73455092 | 196 | .set = &sysctl_table_root.default_set, |
e51b6ba0 EB |
197 | }; |
198 | static struct ctl_table_root sysctl_table_root = { | |
199 | .root_list = LIST_HEAD_INIT(sysctl_table_root.root_list), | |
73455092 | 200 | .default_set.list = LIST_HEAD_INIT(root_table_header.ctl_entry), |
e51b6ba0 | 201 | }; |
1da177e4 | 202 | |
d8217f07 EB |
203 | static struct ctl_table kern_table[]; |
204 | static struct ctl_table vm_table[]; | |
205 | static struct ctl_table fs_table[]; | |
206 | static struct ctl_table debug_table[]; | |
207 | static struct ctl_table dev_table[]; | |
208 | extern struct ctl_table random_table[]; | |
2d9048e2 | 209 | #ifdef CONFIG_INOTIFY_USER |
d8217f07 | 210 | extern struct ctl_table inotify_table[]; |
0399cb08 | 211 | #endif |
7ef9964e DL |
212 | #ifdef CONFIG_EPOLL |
213 | extern struct ctl_table epoll_table[]; | |
214 | #endif | |
1da177e4 LT |
215 | |
216 | #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT | |
217 | int sysctl_legacy_va_layout; | |
218 | #endif | |
219 | ||
1da177e4 LT |
220 | /* The default sysctl tables: */ |
221 | ||
d8217f07 | 222 | static struct ctl_table root_table[] = { |
1da177e4 | 223 | { |
1da177e4 LT |
224 | .procname = "kernel", |
225 | .mode = 0555, | |
226 | .child = kern_table, | |
227 | }, | |
228 | { | |
1da177e4 LT |
229 | .procname = "vm", |
230 | .mode = 0555, | |
231 | .child = vm_table, | |
232 | }, | |
1da177e4 | 233 | { |
1da177e4 LT |
234 | .procname = "fs", |
235 | .mode = 0555, | |
236 | .child = fs_table, | |
237 | }, | |
238 | { | |
1da177e4 LT |
239 | .procname = "debug", |
240 | .mode = 0555, | |
241 | .child = debug_table, | |
242 | }, | |
243 | { | |
1da177e4 LT |
244 | .procname = "dev", |
245 | .mode = 0555, | |
246 | .child = dev_table, | |
247 | }, | |
2be7fe07 AM |
248 | /* |
249 | * NOTE: do not add new entries to this table unless you have read | |
250 | * Documentation/sysctl/ctl_unnumbered.txt | |
251 | */ | |
6fce56ec | 252 | { } |
1da177e4 LT |
253 | }; |
254 | ||
77e54a1f | 255 | #ifdef CONFIG_SCHED_DEBUG |
73c4efd2 ED |
256 | static int min_sched_granularity_ns = 100000; /* 100 usecs */ |
257 | static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */ | |
258 | static int min_wakeup_granularity_ns; /* 0 usecs */ | |
259 | static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */ | |
1983a922 CE |
260 | static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE; |
261 | static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1; | |
acb4a848 CE |
262 | static int min_sched_shares_ratelimit = 100000; /* 100 usec */ |
263 | static int max_sched_shares_ratelimit = NSEC_PER_SEC; /* 1 second */ | |
77e54a1f IM |
264 | #endif |
265 | ||
d8217f07 | 266 | static struct ctl_table kern_table[] = { |
2bba22c5 | 267 | { |
2bba22c5 MG |
268 | .procname = "sched_child_runs_first", |
269 | .data = &sysctl_sched_child_runs_first, | |
270 | .maxlen = sizeof(unsigned int), | |
271 | .mode = 0644, | |
6d456111 | 272 | .proc_handler = proc_dointvec, |
2bba22c5 | 273 | }, |
77e54a1f IM |
274 | #ifdef CONFIG_SCHED_DEBUG |
275 | { | |
b2be5e96 PZ |
276 | .procname = "sched_min_granularity_ns", |
277 | .data = &sysctl_sched_min_granularity, | |
77e54a1f IM |
278 | .maxlen = sizeof(unsigned int), |
279 | .mode = 0644, | |
702a7c76 | 280 | .proc_handler = sched_proc_update_handler, |
b2be5e96 PZ |
281 | .extra1 = &min_sched_granularity_ns, |
282 | .extra2 = &max_sched_granularity_ns, | |
77e54a1f | 283 | }, |
21805085 | 284 | { |
21805085 PZ |
285 | .procname = "sched_latency_ns", |
286 | .data = &sysctl_sched_latency, | |
287 | .maxlen = sizeof(unsigned int), | |
288 | .mode = 0644, | |
702a7c76 | 289 | .proc_handler = sched_proc_update_handler, |
21805085 PZ |
290 | .extra1 = &min_sched_granularity_ns, |
291 | .extra2 = &max_sched_granularity_ns, | |
292 | }, | |
77e54a1f | 293 | { |
77e54a1f IM |
294 | .procname = "sched_wakeup_granularity_ns", |
295 | .data = &sysctl_sched_wakeup_granularity, | |
296 | .maxlen = sizeof(unsigned int), | |
297 | .mode = 0644, | |
702a7c76 | 298 | .proc_handler = sched_proc_update_handler, |
77e54a1f IM |
299 | .extra1 = &min_wakeup_granularity_ns, |
300 | .extra2 = &max_wakeup_granularity_ns, | |
301 | }, | |
2398f2c6 | 302 | { |
2398f2c6 PZ |
303 | .procname = "sched_shares_ratelimit", |
304 | .data = &sysctl_sched_shares_ratelimit, | |
305 | .maxlen = sizeof(unsigned int), | |
306 | .mode = 0644, | |
702a7c76 | 307 | .proc_handler = sched_proc_update_handler, |
acb4a848 CE |
308 | .extra1 = &min_sched_shares_ratelimit, |
309 | .extra2 = &max_sched_shares_ratelimit, | |
2398f2c6 | 310 | }, |
1983a922 | 311 | { |
1983a922 CE |
312 | .procname = "sched_tunable_scaling", |
313 | .data = &sysctl_sched_tunable_scaling, | |
314 | .maxlen = sizeof(enum sched_tunable_scaling), | |
315 | .mode = 0644, | |
702a7c76 | 316 | .proc_handler = sched_proc_update_handler, |
1983a922 CE |
317 | .extra1 = &min_sched_tunable_scaling, |
318 | .extra2 = &max_sched_tunable_scaling, | |
2398f2c6 | 319 | }, |
ffda12a1 | 320 | { |
ffda12a1 PZ |
321 | .procname = "sched_shares_thresh", |
322 | .data = &sysctl_sched_shares_thresh, | |
323 | .maxlen = sizeof(unsigned int), | |
324 | .mode = 0644, | |
6d456111 | 325 | .proc_handler = proc_dointvec_minmax, |
ffda12a1 PZ |
326 | .extra1 = &zero, |
327 | }, | |
da84d961 | 328 | { |
da84d961 IM |
329 | .procname = "sched_migration_cost", |
330 | .data = &sysctl_sched_migration_cost, | |
331 | .maxlen = sizeof(unsigned int), | |
332 | .mode = 0644, | |
6d456111 | 333 | .proc_handler = proc_dointvec, |
da84d961 | 334 | }, |
b82d9fdd | 335 | { |
b82d9fdd PZ |
336 | .procname = "sched_nr_migrate", |
337 | .data = &sysctl_sched_nr_migrate, | |
338 | .maxlen = sizeof(unsigned int), | |
fa85ae24 | 339 | .mode = 0644, |
6d456111 | 340 | .proc_handler = proc_dointvec, |
fa85ae24 | 341 | }, |
e9e9250b | 342 | { |
e9e9250b PZ |
343 | .procname = "sched_time_avg", |
344 | .data = &sysctl_sched_time_avg, | |
345 | .maxlen = sizeof(unsigned int), | |
346 | .mode = 0644, | |
6d456111 | 347 | .proc_handler = proc_dointvec, |
e9e9250b | 348 | }, |
cd1bb94b | 349 | { |
cd1bb94b AB |
350 | .procname = "timer_migration", |
351 | .data = &sysctl_timer_migration, | |
352 | .maxlen = sizeof(unsigned int), | |
353 | .mode = 0644, | |
6d456111 | 354 | .proc_handler = proc_dointvec_minmax, |
bfdb4d9f AB |
355 | .extra1 = &zero, |
356 | .extra2 = &one, | |
fa85ae24 | 357 | }, |
1fc84aaa | 358 | #endif |
9f0c1e56 | 359 | { |
9f0c1e56 PZ |
360 | .procname = "sched_rt_period_us", |
361 | .data = &sysctl_sched_rt_period, | |
362 | .maxlen = sizeof(unsigned int), | |
363 | .mode = 0644, | |
6d456111 | 364 | .proc_handler = sched_rt_handler, |
9f0c1e56 PZ |
365 | }, |
366 | { | |
9f0c1e56 PZ |
367 | .procname = "sched_rt_runtime_us", |
368 | .data = &sysctl_sched_rt_runtime, | |
369 | .maxlen = sizeof(int), | |
370 | .mode = 0644, | |
6d456111 | 371 | .proc_handler = sched_rt_handler, |
9f0c1e56 | 372 | }, |
1799e35d | 373 | { |
1799e35d IM |
374 | .procname = "sched_compat_yield", |
375 | .data = &sysctl_sched_compat_yield, | |
376 | .maxlen = sizeof(unsigned int), | |
377 | .mode = 0644, | |
6d456111 | 378 | .proc_handler = proc_dointvec, |
1799e35d | 379 | }, |
f20786ff PZ |
380 | #ifdef CONFIG_PROVE_LOCKING |
381 | { | |
f20786ff PZ |
382 | .procname = "prove_locking", |
383 | .data = &prove_locking, | |
384 | .maxlen = sizeof(int), | |
385 | .mode = 0644, | |
6d456111 | 386 | .proc_handler = proc_dointvec, |
f20786ff PZ |
387 | }, |
388 | #endif | |
389 | #ifdef CONFIG_LOCK_STAT | |
390 | { | |
f20786ff PZ |
391 | .procname = "lock_stat", |
392 | .data = &lock_stat, | |
393 | .maxlen = sizeof(int), | |
394 | .mode = 0644, | |
6d456111 | 395 | .proc_handler = proc_dointvec, |
f20786ff | 396 | }, |
77e54a1f | 397 | #endif |
1da177e4 | 398 | { |
1da177e4 LT |
399 | .procname = "panic", |
400 | .data = &panic_timeout, | |
401 | .maxlen = sizeof(int), | |
402 | .mode = 0644, | |
6d456111 | 403 | .proc_handler = proc_dointvec, |
1da177e4 LT |
404 | }, |
405 | { | |
1da177e4 LT |
406 | .procname = "core_uses_pid", |
407 | .data = &core_uses_pid, | |
408 | .maxlen = sizeof(int), | |
409 | .mode = 0644, | |
6d456111 | 410 | .proc_handler = proc_dointvec, |
1da177e4 LT |
411 | }, |
412 | { | |
1da177e4 LT |
413 | .procname = "core_pattern", |
414 | .data = core_pattern, | |
71ce92f3 | 415 | .maxlen = CORENAME_MAX_SIZE, |
1da177e4 | 416 | .mode = 0644, |
6d456111 | 417 | .proc_handler = proc_dostring, |
1da177e4 | 418 | }, |
a293980c | 419 | { |
a293980c NH |
420 | .procname = "core_pipe_limit", |
421 | .data = &core_pipe_limit, | |
422 | .maxlen = sizeof(unsigned int), | |
423 | .mode = 0644, | |
6d456111 | 424 | .proc_handler = proc_dointvec, |
a293980c | 425 | }, |
34f5a398 | 426 | #ifdef CONFIG_PROC_SYSCTL |
1da177e4 | 427 | { |
1da177e4 | 428 | .procname = "tainted", |
25ddbb18 | 429 | .maxlen = sizeof(long), |
34f5a398 | 430 | .mode = 0644, |
6d456111 | 431 | .proc_handler = proc_taint, |
1da177e4 | 432 | }, |
34f5a398 | 433 | #endif |
9745512c AV |
434 | #ifdef CONFIG_LATENCYTOP |
435 | { | |
436 | .procname = "latencytop", | |
437 | .data = &latencytop_enabled, | |
438 | .maxlen = sizeof(int), | |
439 | .mode = 0644, | |
6d456111 | 440 | .proc_handler = proc_dointvec, |
9745512c AV |
441 | }, |
442 | #endif | |
1da177e4 LT |
443 | #ifdef CONFIG_BLK_DEV_INITRD |
444 | { | |
1da177e4 LT |
445 | .procname = "real-root-dev", |
446 | .data = &real_root_dev, | |
447 | .maxlen = sizeof(int), | |
448 | .mode = 0644, | |
6d456111 | 449 | .proc_handler = proc_dointvec, |
1da177e4 LT |
450 | }, |
451 | #endif | |
45807a1d | 452 | { |
45807a1d IM |
453 | .procname = "print-fatal-signals", |
454 | .data = &print_fatal_signals, | |
455 | .maxlen = sizeof(int), | |
456 | .mode = 0644, | |
6d456111 | 457 | .proc_handler = proc_dointvec, |
45807a1d | 458 | }, |
72c57ed5 | 459 | #ifdef CONFIG_SPARC |
1da177e4 | 460 | { |
1da177e4 LT |
461 | .procname = "reboot-cmd", |
462 | .data = reboot_command, | |
463 | .maxlen = 256, | |
464 | .mode = 0644, | |
6d456111 | 465 | .proc_handler = proc_dostring, |
1da177e4 LT |
466 | }, |
467 | { | |
1da177e4 LT |
468 | .procname = "stop-a", |
469 | .data = &stop_a_enabled, | |
470 | .maxlen = sizeof (int), | |
471 | .mode = 0644, | |
6d456111 | 472 | .proc_handler = proc_dointvec, |
1da177e4 LT |
473 | }, |
474 | { | |
1da177e4 LT |
475 | .procname = "scons-poweroff", |
476 | .data = &scons_pwroff, | |
477 | .maxlen = sizeof (int), | |
478 | .mode = 0644, | |
6d456111 | 479 | .proc_handler = proc_dointvec, |
1da177e4 LT |
480 | }, |
481 | #endif | |
0871420f DM |
482 | #ifdef CONFIG_SPARC64 |
483 | { | |
0871420f DM |
484 | .procname = "tsb-ratio", |
485 | .data = &sysctl_tsb_ratio, | |
486 | .maxlen = sizeof (int), | |
487 | .mode = 0644, | |
6d456111 | 488 | .proc_handler = proc_dointvec, |
0871420f DM |
489 | }, |
490 | #endif | |
1da177e4 LT |
491 | #ifdef __hppa__ |
492 | { | |
1da177e4 LT |
493 | .procname = "soft-power", |
494 | .data = &pwrsw_enabled, | |
495 | .maxlen = sizeof (int), | |
496 | .mode = 0644, | |
6d456111 | 497 | .proc_handler = proc_dointvec, |
1da177e4 LT |
498 | }, |
499 | { | |
1da177e4 LT |
500 | .procname = "unaligned-trap", |
501 | .data = &unaligned_enabled, | |
502 | .maxlen = sizeof (int), | |
503 | .mode = 0644, | |
6d456111 | 504 | .proc_handler = proc_dointvec, |
1da177e4 LT |
505 | }, |
506 | #endif | |
507 | { | |
1da177e4 LT |
508 | .procname = "ctrl-alt-del", |
509 | .data = &C_A_D, | |
510 | .maxlen = sizeof(int), | |
511 | .mode = 0644, | |
6d456111 | 512 | .proc_handler = proc_dointvec, |
1da177e4 | 513 | }, |
606576ce | 514 | #ifdef CONFIG_FUNCTION_TRACER |
b0fc494f | 515 | { |
b0fc494f SR |
516 | .procname = "ftrace_enabled", |
517 | .data = &ftrace_enabled, | |
518 | .maxlen = sizeof(int), | |
519 | .mode = 0644, | |
6d456111 | 520 | .proc_handler = ftrace_enable_sysctl, |
b0fc494f SR |
521 | }, |
522 | #endif | |
f38f1d2a SR |
523 | #ifdef CONFIG_STACK_TRACER |
524 | { | |
f38f1d2a SR |
525 | .procname = "stack_tracer_enabled", |
526 | .data = &stack_tracer_enabled, | |
527 | .maxlen = sizeof(int), | |
528 | .mode = 0644, | |
6d456111 | 529 | .proc_handler = stack_trace_sysctl, |
f38f1d2a SR |
530 | }, |
531 | #endif | |
944ac425 SR |
532 | #ifdef CONFIG_TRACING |
533 | { | |
3299b4dd | 534 | .procname = "ftrace_dump_on_oops", |
944ac425 SR |
535 | .data = &ftrace_dump_on_oops, |
536 | .maxlen = sizeof(int), | |
537 | .mode = 0644, | |
6d456111 | 538 | .proc_handler = proc_dointvec, |
944ac425 SR |
539 | }, |
540 | #endif | |
a1ef5adb | 541 | #ifdef CONFIG_MODULES |
1da177e4 | 542 | { |
1da177e4 LT |
543 | .procname = "modprobe", |
544 | .data = &modprobe_path, | |
545 | .maxlen = KMOD_PATH_LEN, | |
546 | .mode = 0644, | |
6d456111 | 547 | .proc_handler = proc_dostring, |
1da177e4 | 548 | }, |
3d43321b | 549 | { |
3d43321b KC |
550 | .procname = "modules_disabled", |
551 | .data = &modules_disabled, | |
552 | .maxlen = sizeof(int), | |
553 | .mode = 0644, | |
554 | /* only handle a transition from default "0" to "1" */ | |
6d456111 | 555 | .proc_handler = proc_dointvec_minmax, |
3d43321b KC |
556 | .extra1 = &one, |
557 | .extra2 = &one, | |
558 | }, | |
1da177e4 | 559 | #endif |
57ae2508 | 560 | #if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET) |
1da177e4 | 561 | { |
1da177e4 | 562 | .procname = "hotplug", |
312c004d KS |
563 | .data = &uevent_helper, |
564 | .maxlen = UEVENT_HELPER_PATH_LEN, | |
1da177e4 | 565 | .mode = 0644, |
6d456111 | 566 | .proc_handler = proc_dostring, |
1da177e4 LT |
567 | }, |
568 | #endif | |
569 | #ifdef CONFIG_CHR_DEV_SG | |
570 | { | |
1da177e4 LT |
571 | .procname = "sg-big-buff", |
572 | .data = &sg_big_buff, | |
573 | .maxlen = sizeof (int), | |
574 | .mode = 0444, | |
6d456111 | 575 | .proc_handler = proc_dointvec, |
1da177e4 LT |
576 | }, |
577 | #endif | |
578 | #ifdef CONFIG_BSD_PROCESS_ACCT | |
579 | { | |
1da177e4 LT |
580 | .procname = "acct", |
581 | .data = &acct_parm, | |
582 | .maxlen = 3*sizeof(int), | |
583 | .mode = 0644, | |
6d456111 | 584 | .proc_handler = proc_dointvec, |
1da177e4 LT |
585 | }, |
586 | #endif | |
1da177e4 LT |
587 | #ifdef CONFIG_MAGIC_SYSRQ |
588 | { | |
1da177e4 | 589 | .procname = "sysrq", |
5d6f647f | 590 | .data = &__sysrq_enabled, |
1da177e4 LT |
591 | .maxlen = sizeof (int), |
592 | .mode = 0644, | |
97f5f0cd | 593 | .proc_handler = sysrq_sysctl_handler, |
1da177e4 LT |
594 | }, |
595 | #endif | |
d6f8ff73 | 596 | #ifdef CONFIG_PROC_SYSCTL |
1da177e4 | 597 | { |
1da177e4 | 598 | .procname = "cad_pid", |
9ec52099 | 599 | .data = NULL, |
1da177e4 LT |
600 | .maxlen = sizeof (int), |
601 | .mode = 0600, | |
6d456111 | 602 | .proc_handler = proc_do_cad_pid, |
1da177e4 | 603 | }, |
d6f8ff73 | 604 | #endif |
1da177e4 | 605 | { |
1da177e4 LT |
606 | .procname = "threads-max", |
607 | .data = &max_threads, | |
608 | .maxlen = sizeof(int), | |
609 | .mode = 0644, | |
6d456111 | 610 | .proc_handler = proc_dointvec, |
1da177e4 LT |
611 | }, |
612 | { | |
1da177e4 LT |
613 | .procname = "random", |
614 | .mode = 0555, | |
615 | .child = random_table, | |
616 | }, | |
1da177e4 | 617 | { |
1da177e4 LT |
618 | .procname = "overflowuid", |
619 | .data = &overflowuid, | |
620 | .maxlen = sizeof(int), | |
621 | .mode = 0644, | |
6d456111 | 622 | .proc_handler = proc_dointvec_minmax, |
1da177e4 LT |
623 | .extra1 = &minolduid, |
624 | .extra2 = &maxolduid, | |
625 | }, | |
626 | { | |
1da177e4 LT |
627 | .procname = "overflowgid", |
628 | .data = &overflowgid, | |
629 | .maxlen = sizeof(int), | |
630 | .mode = 0644, | |
6d456111 | 631 | .proc_handler = proc_dointvec_minmax, |
1da177e4 LT |
632 | .extra1 = &minolduid, |
633 | .extra2 = &maxolduid, | |
634 | }, | |
347a8dc3 | 635 | #ifdef CONFIG_S390 |
1da177e4 LT |
636 | #ifdef CONFIG_MATHEMU |
637 | { | |
1da177e4 LT |
638 | .procname = "ieee_emulation_warnings", |
639 | .data = &sysctl_ieee_emulation_warnings, | |
640 | .maxlen = sizeof(int), | |
641 | .mode = 0644, | |
6d456111 | 642 | .proc_handler = proc_dointvec, |
1da177e4 | 643 | }, |
1da177e4 LT |
644 | #endif |
645 | { | |
1da177e4 | 646 | .procname = "userprocess_debug", |
ab3c68ee | 647 | .data = &show_unhandled_signals, |
1da177e4 LT |
648 | .maxlen = sizeof(int), |
649 | .mode = 0644, | |
6d456111 | 650 | .proc_handler = proc_dointvec, |
1da177e4 LT |
651 | }, |
652 | #endif | |
653 | { | |
1da177e4 LT |
654 | .procname = "pid_max", |
655 | .data = &pid_max, | |
656 | .maxlen = sizeof (int), | |
657 | .mode = 0644, | |
6d456111 | 658 | .proc_handler = proc_dointvec_minmax, |
1da177e4 LT |
659 | .extra1 = &pid_max_min, |
660 | .extra2 = &pid_max_max, | |
661 | }, | |
662 | { | |
1da177e4 LT |
663 | .procname = "panic_on_oops", |
664 | .data = &panic_on_oops, | |
665 | .maxlen = sizeof(int), | |
666 | .mode = 0644, | |
6d456111 | 667 | .proc_handler = proc_dointvec, |
1da177e4 | 668 | }, |
7ef3d2fd JP |
669 | #if defined CONFIG_PRINTK |
670 | { | |
7ef3d2fd JP |
671 | .procname = "printk", |
672 | .data = &console_loglevel, | |
673 | .maxlen = 4*sizeof(int), | |
674 | .mode = 0644, | |
6d456111 | 675 | .proc_handler = proc_dointvec, |
7ef3d2fd | 676 | }, |
1da177e4 | 677 | { |
1da177e4 | 678 | .procname = "printk_ratelimit", |
717115e1 | 679 | .data = &printk_ratelimit_state.interval, |
1da177e4 LT |
680 | .maxlen = sizeof(int), |
681 | .mode = 0644, | |
6d456111 | 682 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
683 | }, |
684 | { | |
1da177e4 | 685 | .procname = "printk_ratelimit_burst", |
717115e1 | 686 | .data = &printk_ratelimit_state.burst, |
1da177e4 LT |
687 | .maxlen = sizeof(int), |
688 | .mode = 0644, | |
6d456111 | 689 | .proc_handler = proc_dointvec, |
1da177e4 | 690 | }, |
af91322e | 691 | { |
af91322e DY |
692 | .procname = "printk_delay", |
693 | .data = &printk_delay_msec, | |
694 | .maxlen = sizeof(int), | |
695 | .mode = 0644, | |
6d456111 | 696 | .proc_handler = proc_dointvec_minmax, |
af91322e DY |
697 | .extra1 = &zero, |
698 | .extra2 = &ten_thousand, | |
699 | }, | |
7ef3d2fd | 700 | #endif |
1da177e4 | 701 | { |
1da177e4 LT |
702 | .procname = "ngroups_max", |
703 | .data = &ngroups_max, | |
704 | .maxlen = sizeof (int), | |
705 | .mode = 0444, | |
6d456111 | 706 | .proc_handler = proc_dointvec, |
1da177e4 LT |
707 | }, |
708 | #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86) | |
709 | { | |
1da177e4 LT |
710 | .procname = "unknown_nmi_panic", |
711 | .data = &unknown_nmi_panic, | |
712 | .maxlen = sizeof (int), | |
713 | .mode = 0644, | |
6d456111 | 714 | .proc_handler = proc_dointvec, |
1da177e4 | 715 | }, |
407984f1 | 716 | { |
407984f1 DZ |
717 | .procname = "nmi_watchdog", |
718 | .data = &nmi_watchdog_enabled, | |
719 | .maxlen = sizeof (int), | |
720 | .mode = 0644, | |
6d456111 | 721 | .proc_handler = proc_nmi_enabled, |
1da177e4 LT |
722 | }, |
723 | #endif | |
724 | #if defined(CONFIG_X86) | |
8da5adda | 725 | { |
8da5adda DZ |
726 | .procname = "panic_on_unrecovered_nmi", |
727 | .data = &panic_on_unrecovered_nmi, | |
728 | .maxlen = sizeof(int), | |
729 | .mode = 0644, | |
6d456111 | 730 | .proc_handler = proc_dointvec, |
8da5adda | 731 | }, |
5211a242 | 732 | { |
5211a242 KG |
733 | .procname = "panic_on_io_nmi", |
734 | .data = &panic_on_io_nmi, | |
735 | .maxlen = sizeof(int), | |
736 | .mode = 0644, | |
6d456111 | 737 | .proc_handler = proc_dointvec, |
5211a242 | 738 | }, |
1da177e4 | 739 | { |
1da177e4 LT |
740 | .procname = "bootloader_type", |
741 | .data = &bootloader_type, | |
742 | .maxlen = sizeof (int), | |
743 | .mode = 0444, | |
6d456111 | 744 | .proc_handler = proc_dointvec, |
1da177e4 | 745 | }, |
5031296c | 746 | { |
5031296c PA |
747 | .procname = "bootloader_version", |
748 | .data = &bootloader_version, | |
749 | .maxlen = sizeof (int), | |
750 | .mode = 0444, | |
6d456111 | 751 | .proc_handler = proc_dointvec, |
5031296c | 752 | }, |
0741f4d2 | 753 | { |
0741f4d2 CE |
754 | .procname = "kstack_depth_to_print", |
755 | .data = &kstack_depth_to_print, | |
756 | .maxlen = sizeof(int), | |
757 | .mode = 0644, | |
6d456111 | 758 | .proc_handler = proc_dointvec, |
0741f4d2 | 759 | }, |
6e7c4025 | 760 | { |
6e7c4025 IM |
761 | .procname = "io_delay_type", |
762 | .data = &io_delay_type, | |
763 | .maxlen = sizeof(int), | |
764 | .mode = 0644, | |
6d456111 | 765 | .proc_handler = proc_dointvec, |
6e7c4025 | 766 | }, |
1da177e4 | 767 | #endif |
7a9166e3 | 768 | #if defined(CONFIG_MMU) |
1da177e4 | 769 | { |
1da177e4 LT |
770 | .procname = "randomize_va_space", |
771 | .data = &randomize_va_space, | |
772 | .maxlen = sizeof(int), | |
773 | .mode = 0644, | |
6d456111 | 774 | .proc_handler = proc_dointvec, |
1da177e4 | 775 | }, |
7a9166e3 | 776 | #endif |
0152fb37 | 777 | #if defined(CONFIG_S390) && defined(CONFIG_SMP) |
951f22d5 | 778 | { |
951f22d5 MS |
779 | .procname = "spin_retry", |
780 | .data = &spin_retry, | |
781 | .maxlen = sizeof (int), | |
782 | .mode = 0644, | |
6d456111 | 783 | .proc_handler = proc_dointvec, |
951f22d5 | 784 | }, |
c255d844 | 785 | #endif |
673d5b43 | 786 | #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86) |
c255d844 | 787 | { |
c255d844 | 788 | .procname = "acpi_video_flags", |
77afcf78 | 789 | .data = &acpi_realmode_flags, |
c255d844 PM |
790 | .maxlen = sizeof (unsigned long), |
791 | .mode = 0644, | |
6d456111 | 792 | .proc_handler = proc_doulongvec_minmax, |
c255d844 | 793 | }, |
d2b176ed JS |
794 | #endif |
795 | #ifdef CONFIG_IA64 | |
796 | { | |
d2b176ed JS |
797 | .procname = "ignore-unaligned-usertrap", |
798 | .data = &no_unaligned_warning, | |
799 | .maxlen = sizeof (int), | |
800 | .mode = 0644, | |
6d456111 | 801 | .proc_handler = proc_dointvec, |
d2b176ed | 802 | }, |
88fc241f | 803 | { |
88fc241f DC |
804 | .procname = "unaligned-dump-stack", |
805 | .data = &unaligned_dump_stack, | |
806 | .maxlen = sizeof (int), | |
807 | .mode = 0644, | |
6d456111 | 808 | .proc_handler = proc_dointvec, |
88fc241f | 809 | }, |
bebfa101 | 810 | #endif |
c4f3b63f | 811 | #ifdef CONFIG_DETECT_SOFTLOCKUP |
9c44bc03 | 812 | { |
9c44bc03 IM |
813 | .procname = "softlockup_panic", |
814 | .data = &softlockup_panic, | |
815 | .maxlen = sizeof(int), | |
816 | .mode = 0644, | |
6d456111 | 817 | .proc_handler = proc_dointvec_minmax, |
9c44bc03 IM |
818 | .extra1 = &zero, |
819 | .extra2 = &one, | |
820 | }, | |
c4f3b63f | 821 | { |
c4f3b63f RT |
822 | .procname = "softlockup_thresh", |
823 | .data = &softlockup_thresh, | |
9383d967 | 824 | .maxlen = sizeof(int), |
c4f3b63f | 825 | .mode = 0644, |
6d456111 | 826 | .proc_handler = proc_dosoftlockup_thresh, |
9383d967 | 827 | .extra1 = &neg_one, |
c4f3b63f RT |
828 | .extra2 = &sixty, |
829 | }, | |
e162b39a MSB |
830 | #endif |
831 | #ifdef CONFIG_DETECT_HUNG_TASK | |
832 | { | |
e162b39a MSB |
833 | .procname = "hung_task_panic", |
834 | .data = &sysctl_hung_task_panic, | |
835 | .maxlen = sizeof(int), | |
836 | .mode = 0644, | |
6d456111 | 837 | .proc_handler = proc_dointvec_minmax, |
e162b39a MSB |
838 | .extra1 = &zero, |
839 | .extra2 = &one, | |
840 | }, | |
82a1fcb9 | 841 | { |
82a1fcb9 IM |
842 | .procname = "hung_task_check_count", |
843 | .data = &sysctl_hung_task_check_count, | |
90739081 | 844 | .maxlen = sizeof(unsigned long), |
82a1fcb9 | 845 | .mode = 0644, |
6d456111 | 846 | .proc_handler = proc_doulongvec_minmax, |
82a1fcb9 IM |
847 | }, |
848 | { | |
82a1fcb9 IM |
849 | .procname = "hung_task_timeout_secs", |
850 | .data = &sysctl_hung_task_timeout_secs, | |
90739081 | 851 | .maxlen = sizeof(unsigned long), |
82a1fcb9 | 852 | .mode = 0644, |
6d456111 | 853 | .proc_handler = proc_dohung_task_timeout_secs, |
82a1fcb9 IM |
854 | }, |
855 | { | |
82a1fcb9 IM |
856 | .procname = "hung_task_warnings", |
857 | .data = &sysctl_hung_task_warnings, | |
90739081 | 858 | .maxlen = sizeof(unsigned long), |
82a1fcb9 | 859 | .mode = 0644, |
6d456111 | 860 | .proc_handler = proc_doulongvec_minmax, |
82a1fcb9 | 861 | }, |
c4f3b63f | 862 | #endif |
bebfa101 AK |
863 | #ifdef CONFIG_COMPAT |
864 | { | |
bebfa101 AK |
865 | .procname = "compat-log", |
866 | .data = &compat_log, | |
867 | .maxlen = sizeof (int), | |
868 | .mode = 0644, | |
6d456111 | 869 | .proc_handler = proc_dointvec, |
bebfa101 | 870 | }, |
951f22d5 | 871 | #endif |
23f78d4a IM |
872 | #ifdef CONFIG_RT_MUTEXES |
873 | { | |
23f78d4a IM |
874 | .procname = "max_lock_depth", |
875 | .data = &max_lock_depth, | |
876 | .maxlen = sizeof(int), | |
877 | .mode = 0644, | |
6d456111 | 878 | .proc_handler = proc_dointvec, |
23f78d4a | 879 | }, |
5096add8 | 880 | #endif |
10a0a8d4 | 881 | { |
10a0a8d4 JF |
882 | .procname = "poweroff_cmd", |
883 | .data = &poweroff_cmd, | |
884 | .maxlen = POWEROFF_CMD_PATH_LEN, | |
885 | .mode = 0644, | |
6d456111 | 886 | .proc_handler = proc_dostring, |
10a0a8d4 | 887 | }, |
0b77f5bf DH |
888 | #ifdef CONFIG_KEYS |
889 | { | |
0b77f5bf DH |
890 | .procname = "keys", |
891 | .mode = 0555, | |
892 | .child = key_sysctls, | |
893 | }, | |
894 | #endif | |
31a72bce PM |
895 | #ifdef CONFIG_RCU_TORTURE_TEST |
896 | { | |
31a72bce PM |
897 | .procname = "rcutorture_runnable", |
898 | .data = &rcutorture_runnable, | |
899 | .maxlen = sizeof(int), | |
900 | .mode = 0644, | |
6d456111 | 901 | .proc_handler = proc_dointvec, |
31a72bce PM |
902 | }, |
903 | #endif | |
12e22c5e DH |
904 | #ifdef CONFIG_SLOW_WORK |
905 | { | |
12e22c5e DH |
906 | .procname = "slow-work", |
907 | .mode = 0555, | |
908 | .child = slow_work_sysctls, | |
909 | }, | |
910 | #endif | |
cdd6c482 | 911 | #ifdef CONFIG_PERF_EVENTS |
1ccd1549 | 912 | { |
cdd6c482 IM |
913 | .procname = "perf_event_paranoid", |
914 | .data = &sysctl_perf_event_paranoid, | |
915 | .maxlen = sizeof(sysctl_perf_event_paranoid), | |
1ccd1549 | 916 | .mode = 0644, |
6d456111 | 917 | .proc_handler = proc_dointvec, |
1ccd1549 | 918 | }, |
c5078f78 | 919 | { |
cdd6c482 IM |
920 | .procname = "perf_event_mlock_kb", |
921 | .data = &sysctl_perf_event_mlock, | |
922 | .maxlen = sizeof(sysctl_perf_event_mlock), | |
c5078f78 | 923 | .mode = 0644, |
6d456111 | 924 | .proc_handler = proc_dointvec, |
c5078f78 | 925 | }, |
a78ac325 | 926 | { |
cdd6c482 IM |
927 | .procname = "perf_event_max_sample_rate", |
928 | .data = &sysctl_perf_event_sample_rate, | |
929 | .maxlen = sizeof(sysctl_perf_event_sample_rate), | |
a78ac325 | 930 | .mode = 0644, |
6d456111 | 931 | .proc_handler = proc_dointvec, |
a78ac325 | 932 | }, |
1ccd1549 | 933 | #endif |
dfec072e VN |
934 | #ifdef CONFIG_KMEMCHECK |
935 | { | |
dfec072e VN |
936 | .procname = "kmemcheck", |
937 | .data = &kmemcheck_enabled, | |
938 | .maxlen = sizeof(int), | |
939 | .mode = 0644, | |
6d456111 | 940 | .proc_handler = proc_dointvec, |
dfec072e VN |
941 | }, |
942 | #endif | |
cb684b5b | 943 | #ifdef CONFIG_BLOCK |
5e605b64 | 944 | { |
5e605b64 JA |
945 | .procname = "blk_iopoll", |
946 | .data = &blk_iopoll_enabled, | |
947 | .maxlen = sizeof(int), | |
948 | .mode = 0644, | |
6d456111 | 949 | .proc_handler = proc_dointvec, |
5e605b64 | 950 | }, |
cb684b5b | 951 | #endif |
ed2c12f3 AM |
952 | /* |
953 | * NOTE: do not add new entries to this table unless you have read | |
954 | * Documentation/sysctl/ctl_unnumbered.txt | |
955 | */ | |
6fce56ec | 956 | { } |
1da177e4 LT |
957 | }; |
958 | ||
d8217f07 | 959 | static struct ctl_table vm_table[] = { |
1da177e4 | 960 | { |
1da177e4 LT |
961 | .procname = "overcommit_memory", |
962 | .data = &sysctl_overcommit_memory, | |
963 | .maxlen = sizeof(sysctl_overcommit_memory), | |
964 | .mode = 0644, | |
6d456111 | 965 | .proc_handler = proc_dointvec, |
1da177e4 | 966 | }, |
fadd8fbd | 967 | { |
fadd8fbd KH |
968 | .procname = "panic_on_oom", |
969 | .data = &sysctl_panic_on_oom, | |
970 | .maxlen = sizeof(sysctl_panic_on_oom), | |
971 | .mode = 0644, | |
6d456111 | 972 | .proc_handler = proc_dointvec, |
fadd8fbd | 973 | }, |
fe071d7e | 974 | { |
fe071d7e DR |
975 | .procname = "oom_kill_allocating_task", |
976 | .data = &sysctl_oom_kill_allocating_task, | |
977 | .maxlen = sizeof(sysctl_oom_kill_allocating_task), | |
978 | .mode = 0644, | |
6d456111 | 979 | .proc_handler = proc_dointvec, |
fe071d7e | 980 | }, |
fef1bdd6 | 981 | { |
fef1bdd6 DR |
982 | .procname = "oom_dump_tasks", |
983 | .data = &sysctl_oom_dump_tasks, | |
984 | .maxlen = sizeof(sysctl_oom_dump_tasks), | |
985 | .mode = 0644, | |
6d456111 | 986 | .proc_handler = proc_dointvec, |
fef1bdd6 | 987 | }, |
1da177e4 | 988 | { |
1da177e4 LT |
989 | .procname = "overcommit_ratio", |
990 | .data = &sysctl_overcommit_ratio, | |
991 | .maxlen = sizeof(sysctl_overcommit_ratio), | |
992 | .mode = 0644, | |
6d456111 | 993 | .proc_handler = proc_dointvec, |
1da177e4 LT |
994 | }, |
995 | { | |
1da177e4 LT |
996 | .procname = "page-cluster", |
997 | .data = &page_cluster, | |
998 | .maxlen = sizeof(int), | |
999 | .mode = 0644, | |
6d456111 | 1000 | .proc_handler = proc_dointvec, |
1da177e4 LT |
1001 | }, |
1002 | { | |
1da177e4 LT |
1003 | .procname = "dirty_background_ratio", |
1004 | .data = &dirty_background_ratio, | |
1005 | .maxlen = sizeof(dirty_background_ratio), | |
1006 | .mode = 0644, | |
6d456111 | 1007 | .proc_handler = dirty_background_ratio_handler, |
1da177e4 LT |
1008 | .extra1 = &zero, |
1009 | .extra2 = &one_hundred, | |
1010 | }, | |
2da02997 | 1011 | { |
2da02997 DR |
1012 | .procname = "dirty_background_bytes", |
1013 | .data = &dirty_background_bytes, | |
1014 | .maxlen = sizeof(dirty_background_bytes), | |
1015 | .mode = 0644, | |
6d456111 | 1016 | .proc_handler = dirty_background_bytes_handler, |
fc3501d4 | 1017 | .extra1 = &one_ul, |
2da02997 | 1018 | }, |
1da177e4 | 1019 | { |
1da177e4 LT |
1020 | .procname = "dirty_ratio", |
1021 | .data = &vm_dirty_ratio, | |
1022 | .maxlen = sizeof(vm_dirty_ratio), | |
1023 | .mode = 0644, | |
6d456111 | 1024 | .proc_handler = dirty_ratio_handler, |
1da177e4 LT |
1025 | .extra1 = &zero, |
1026 | .extra2 = &one_hundred, | |
1027 | }, | |
2da02997 | 1028 | { |
2da02997 DR |
1029 | .procname = "dirty_bytes", |
1030 | .data = &vm_dirty_bytes, | |
1031 | .maxlen = sizeof(vm_dirty_bytes), | |
1032 | .mode = 0644, | |
6d456111 | 1033 | .proc_handler = dirty_bytes_handler, |
9e4a5bda | 1034 | .extra1 = &dirty_bytes_min, |
2da02997 | 1035 | }, |
1da177e4 | 1036 | { |
1da177e4 | 1037 | .procname = "dirty_writeback_centisecs", |
f6ef9438 BS |
1038 | .data = &dirty_writeback_interval, |
1039 | .maxlen = sizeof(dirty_writeback_interval), | |
1da177e4 | 1040 | .mode = 0644, |
6d456111 | 1041 | .proc_handler = dirty_writeback_centisecs_handler, |
1da177e4 LT |
1042 | }, |
1043 | { | |
1da177e4 | 1044 | .procname = "dirty_expire_centisecs", |
f6ef9438 BS |
1045 | .data = &dirty_expire_interval, |
1046 | .maxlen = sizeof(dirty_expire_interval), | |
1da177e4 | 1047 | .mode = 0644, |
6d456111 | 1048 | .proc_handler = proc_dointvec, |
1da177e4 LT |
1049 | }, |
1050 | { | |
1da177e4 LT |
1051 | .procname = "nr_pdflush_threads", |
1052 | .data = &nr_pdflush_threads, | |
1053 | .maxlen = sizeof nr_pdflush_threads, | |
1054 | .mode = 0444 /* read-only*/, | |
6d456111 | 1055 | .proc_handler = proc_dointvec, |
1da177e4 LT |
1056 | }, |
1057 | { | |
1da177e4 LT |
1058 | .procname = "swappiness", |
1059 | .data = &vm_swappiness, | |
1060 | .maxlen = sizeof(vm_swappiness), | |
1061 | .mode = 0644, | |
6d456111 | 1062 | .proc_handler = proc_dointvec_minmax, |
1da177e4 LT |
1063 | .extra1 = &zero, |
1064 | .extra2 = &one_hundred, | |
1065 | }, | |
1066 | #ifdef CONFIG_HUGETLB_PAGE | |
06808b08 | 1067 | { |
1da177e4 | 1068 | .procname = "nr_hugepages", |
e5ff2159 | 1069 | .data = NULL, |
1da177e4 LT |
1070 | .maxlen = sizeof(unsigned long), |
1071 | .mode = 0644, | |
6d456111 | 1072 | .proc_handler = hugetlb_sysctl_handler, |
1da177e4 LT |
1073 | .extra1 = (void *)&hugetlb_zero, |
1074 | .extra2 = (void *)&hugetlb_infinity, | |
06808b08 LS |
1075 | }, |
1076 | #ifdef CONFIG_NUMA | |
1077 | { | |
1078 | .procname = "nr_hugepages_mempolicy", | |
1079 | .data = NULL, | |
1080 | .maxlen = sizeof(unsigned long), | |
1081 | .mode = 0644, | |
1082 | .proc_handler = &hugetlb_mempolicy_sysctl_handler, | |
1083 | .extra1 = (void *)&hugetlb_zero, | |
1084 | .extra2 = (void *)&hugetlb_infinity, | |
1085 | }, | |
1086 | #endif | |
1da177e4 | 1087 | { |
1da177e4 LT |
1088 | .procname = "hugetlb_shm_group", |
1089 | .data = &sysctl_hugetlb_shm_group, | |
1090 | .maxlen = sizeof(gid_t), | |
1091 | .mode = 0644, | |
6d456111 | 1092 | .proc_handler = proc_dointvec, |
1da177e4 | 1093 | }, |
396faf03 | 1094 | { |
396faf03 MG |
1095 | .procname = "hugepages_treat_as_movable", |
1096 | .data = &hugepages_treat_as_movable, | |
1097 | .maxlen = sizeof(int), | |
1098 | .mode = 0644, | |
6d456111 | 1099 | .proc_handler = hugetlb_treat_movable_handler, |
396faf03 | 1100 | }, |
d1c3fb1f | 1101 | { |
d1c3fb1f | 1102 | .procname = "nr_overcommit_hugepages", |
e5ff2159 AK |
1103 | .data = NULL, |
1104 | .maxlen = sizeof(unsigned long), | |
d1c3fb1f | 1105 | .mode = 0644, |
6d456111 | 1106 | .proc_handler = hugetlb_overcommit_handler, |
e5ff2159 AK |
1107 | .extra1 = (void *)&hugetlb_zero, |
1108 | .extra2 = (void *)&hugetlb_infinity, | |
d1c3fb1f | 1109 | }, |
1da177e4 LT |
1110 | #endif |
1111 | { | |
1da177e4 LT |
1112 | .procname = "lowmem_reserve_ratio", |
1113 | .data = &sysctl_lowmem_reserve_ratio, | |
1114 | .maxlen = sizeof(sysctl_lowmem_reserve_ratio), | |
1115 | .mode = 0644, | |
6d456111 | 1116 | .proc_handler = lowmem_reserve_ratio_sysctl_handler, |
1da177e4 | 1117 | }, |
9d0243bc | 1118 | { |
9d0243bc AM |
1119 | .procname = "drop_caches", |
1120 | .data = &sysctl_drop_caches, | |
1121 | .maxlen = sizeof(int), | |
1122 | .mode = 0644, | |
1123 | .proc_handler = drop_caches_sysctl_handler, | |
9d0243bc | 1124 | }, |
76ab0f53 MG |
1125 | #ifdef CONFIG_COMPACTION |
1126 | { | |
1127 | .procname = "compact_memory", | |
1128 | .data = &sysctl_compact_memory, | |
1129 | .maxlen = sizeof(int), | |
1130 | .mode = 0200, | |
1131 | .proc_handler = sysctl_compaction_handler, | |
1132 | }, | |
1133 | #endif /* CONFIG_COMPACTION */ | |
1da177e4 | 1134 | { |
1da177e4 LT |
1135 | .procname = "min_free_kbytes", |
1136 | .data = &min_free_kbytes, | |
1137 | .maxlen = sizeof(min_free_kbytes), | |
1138 | .mode = 0644, | |
6d456111 | 1139 | .proc_handler = min_free_kbytes_sysctl_handler, |
1da177e4 LT |
1140 | .extra1 = &zero, |
1141 | }, | |
8ad4b1fb | 1142 | { |
8ad4b1fb RS |
1143 | .procname = "percpu_pagelist_fraction", |
1144 | .data = &percpu_pagelist_fraction, | |
1145 | .maxlen = sizeof(percpu_pagelist_fraction), | |
1146 | .mode = 0644, | |
6d456111 | 1147 | .proc_handler = percpu_pagelist_fraction_sysctl_handler, |
8ad4b1fb RS |
1148 | .extra1 = &min_percpu_pagelist_fract, |
1149 | }, | |
1da177e4 LT |
1150 | #ifdef CONFIG_MMU |
1151 | { | |
1da177e4 LT |
1152 | .procname = "max_map_count", |
1153 | .data = &sysctl_max_map_count, | |
1154 | .maxlen = sizeof(sysctl_max_map_count), | |
1155 | .mode = 0644, | |
3e26120c | 1156 | .proc_handler = proc_dointvec_minmax, |
70da2340 | 1157 | .extra1 = &zero, |
1da177e4 | 1158 | }, |
dd8632a1 PM |
1159 | #else |
1160 | { | |
dd8632a1 PM |
1161 | .procname = "nr_trim_pages", |
1162 | .data = &sysctl_nr_trim_pages, | |
1163 | .maxlen = sizeof(sysctl_nr_trim_pages), | |
1164 | .mode = 0644, | |
6d456111 | 1165 | .proc_handler = proc_dointvec_minmax, |
dd8632a1 PM |
1166 | .extra1 = &zero, |
1167 | }, | |
1da177e4 LT |
1168 | #endif |
1169 | { | |
1da177e4 LT |
1170 | .procname = "laptop_mode", |
1171 | .data = &laptop_mode, | |
1172 | .maxlen = sizeof(laptop_mode), | |
1173 | .mode = 0644, | |
6d456111 | 1174 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
1175 | }, |
1176 | { | |
1da177e4 LT |
1177 | .procname = "block_dump", |
1178 | .data = &block_dump, | |
1179 | .maxlen = sizeof(block_dump), | |
1180 | .mode = 0644, | |
6d456111 | 1181 | .proc_handler = proc_dointvec, |
1da177e4 LT |
1182 | .extra1 = &zero, |
1183 | }, | |
1184 | { | |
1da177e4 LT |
1185 | .procname = "vfs_cache_pressure", |
1186 | .data = &sysctl_vfs_cache_pressure, | |
1187 | .maxlen = sizeof(sysctl_vfs_cache_pressure), | |
1188 | .mode = 0644, | |
6d456111 | 1189 | .proc_handler = proc_dointvec, |
1da177e4 LT |
1190 | .extra1 = &zero, |
1191 | }, | |
1192 | #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT | |
1193 | { | |
1da177e4 LT |
1194 | .procname = "legacy_va_layout", |
1195 | .data = &sysctl_legacy_va_layout, | |
1196 | .maxlen = sizeof(sysctl_legacy_va_layout), | |
1197 | .mode = 0644, | |
6d456111 | 1198 | .proc_handler = proc_dointvec, |
1da177e4 LT |
1199 | .extra1 = &zero, |
1200 | }, | |
1201 | #endif | |
1743660b CL |
1202 | #ifdef CONFIG_NUMA |
1203 | { | |
1743660b CL |
1204 | .procname = "zone_reclaim_mode", |
1205 | .data = &zone_reclaim_mode, | |
1206 | .maxlen = sizeof(zone_reclaim_mode), | |
1207 | .mode = 0644, | |
6d456111 | 1208 | .proc_handler = proc_dointvec, |
c84db23c | 1209 | .extra1 = &zero, |
1743660b | 1210 | }, |
9614634f | 1211 | { |
9614634f CL |
1212 | .procname = "min_unmapped_ratio", |
1213 | .data = &sysctl_min_unmapped_ratio, | |
1214 | .maxlen = sizeof(sysctl_min_unmapped_ratio), | |
1215 | .mode = 0644, | |
6d456111 | 1216 | .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler, |
9614634f CL |
1217 | .extra1 = &zero, |
1218 | .extra2 = &one_hundred, | |
1219 | }, | |
0ff38490 | 1220 | { |
0ff38490 CL |
1221 | .procname = "min_slab_ratio", |
1222 | .data = &sysctl_min_slab_ratio, | |
1223 | .maxlen = sizeof(sysctl_min_slab_ratio), | |
1224 | .mode = 0644, | |
6d456111 | 1225 | .proc_handler = sysctl_min_slab_ratio_sysctl_handler, |
0ff38490 CL |
1226 | .extra1 = &zero, |
1227 | .extra2 = &one_hundred, | |
1228 | }, | |
e6e5494c | 1229 | #endif |
77461ab3 CL |
1230 | #ifdef CONFIG_SMP |
1231 | { | |
77461ab3 CL |
1232 | .procname = "stat_interval", |
1233 | .data = &sysctl_stat_interval, | |
1234 | .maxlen = sizeof(sysctl_stat_interval), | |
1235 | .mode = 0644, | |
6d456111 | 1236 | .proc_handler = proc_dointvec_jiffies, |
77461ab3 CL |
1237 | }, |
1238 | #endif | |
6e141546 | 1239 | #ifdef CONFIG_MMU |
ed032189 | 1240 | { |
ed032189 | 1241 | .procname = "mmap_min_addr", |
788084ab EP |
1242 | .data = &dac_mmap_min_addr, |
1243 | .maxlen = sizeof(unsigned long), | |
ed032189 | 1244 | .mode = 0644, |
6d456111 | 1245 | .proc_handler = mmap_min_addr_handler, |
ed032189 | 1246 | }, |
6e141546 | 1247 | #endif |
f0c0b2b8 KH |
1248 | #ifdef CONFIG_NUMA |
1249 | { | |
f0c0b2b8 KH |
1250 | .procname = "numa_zonelist_order", |
1251 | .data = &numa_zonelist_order, | |
1252 | .maxlen = NUMA_ZONELIST_ORDER_LEN, | |
1253 | .mode = 0644, | |
6d456111 | 1254 | .proc_handler = numa_zonelist_order_handler, |
f0c0b2b8 KH |
1255 | }, |
1256 | #endif | |
2b8232ce | 1257 | #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \ |
5c36e657 | 1258 | (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL)) |
e6e5494c | 1259 | { |
e6e5494c IM |
1260 | .procname = "vdso_enabled", |
1261 | .data = &vdso_enabled, | |
1262 | .maxlen = sizeof(vdso_enabled), | |
1263 | .mode = 0644, | |
6d456111 | 1264 | .proc_handler = proc_dointvec, |
e6e5494c IM |
1265 | .extra1 = &zero, |
1266 | }, | |
1da177e4 | 1267 | #endif |
195cf453 BG |
1268 | #ifdef CONFIG_HIGHMEM |
1269 | { | |
195cf453 BG |
1270 | .procname = "highmem_is_dirtyable", |
1271 | .data = &vm_highmem_is_dirtyable, | |
1272 | .maxlen = sizeof(vm_highmem_is_dirtyable), | |
1273 | .mode = 0644, | |
6d456111 | 1274 | .proc_handler = proc_dointvec_minmax, |
195cf453 BG |
1275 | .extra1 = &zero, |
1276 | .extra2 = &one, | |
1277 | }, | |
1278 | #endif | |
4be6f6bb | 1279 | { |
4be6f6bb PZ |
1280 | .procname = "scan_unevictable_pages", |
1281 | .data = &scan_unevictable_pages, | |
1282 | .maxlen = sizeof(scan_unevictable_pages), | |
1283 | .mode = 0644, | |
6d456111 | 1284 | .proc_handler = scan_unevictable_handler, |
4be6f6bb | 1285 | }, |
6a46079c AK |
1286 | #ifdef CONFIG_MEMORY_FAILURE |
1287 | { | |
6a46079c AK |
1288 | .procname = "memory_failure_early_kill", |
1289 | .data = &sysctl_memory_failure_early_kill, | |
1290 | .maxlen = sizeof(sysctl_memory_failure_early_kill), | |
1291 | .mode = 0644, | |
6d456111 | 1292 | .proc_handler = proc_dointvec_minmax, |
6a46079c AK |
1293 | .extra1 = &zero, |
1294 | .extra2 = &one, | |
1295 | }, | |
1296 | { | |
6a46079c AK |
1297 | .procname = "memory_failure_recovery", |
1298 | .data = &sysctl_memory_failure_recovery, | |
1299 | .maxlen = sizeof(sysctl_memory_failure_recovery), | |
1300 | .mode = 0644, | |
6d456111 | 1301 | .proc_handler = proc_dointvec_minmax, |
6a46079c AK |
1302 | .extra1 = &zero, |
1303 | .extra2 = &one, | |
1304 | }, | |
1305 | #endif | |
1306 | ||
2be7fe07 AM |
1307 | /* |
1308 | * NOTE: do not add new entries to this table unless you have read | |
1309 | * Documentation/sysctl/ctl_unnumbered.txt | |
1310 | */ | |
6fce56ec | 1311 | { } |
1da177e4 LT |
1312 | }; |
1313 | ||
2abc26fc | 1314 | #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) |
d8217f07 | 1315 | static struct ctl_table binfmt_misc_table[] = { |
6fce56ec | 1316 | { } |
2abc26fc EB |
1317 | }; |
1318 | #endif | |
1319 | ||
d8217f07 | 1320 | static struct ctl_table fs_table[] = { |
1da177e4 | 1321 | { |
1da177e4 LT |
1322 | .procname = "inode-nr", |
1323 | .data = &inodes_stat, | |
1324 | .maxlen = 2*sizeof(int), | |
1325 | .mode = 0444, | |
6d456111 | 1326 | .proc_handler = proc_dointvec, |
1da177e4 LT |
1327 | }, |
1328 | { | |
1da177e4 LT |
1329 | .procname = "inode-state", |
1330 | .data = &inodes_stat, | |
1331 | .maxlen = 7*sizeof(int), | |
1332 | .mode = 0444, | |
6d456111 | 1333 | .proc_handler = proc_dointvec, |
1da177e4 LT |
1334 | }, |
1335 | { | |
1da177e4 LT |
1336 | .procname = "file-nr", |
1337 | .data = &files_stat, | |
1338 | .maxlen = 3*sizeof(int), | |
1339 | .mode = 0444, | |
6d456111 | 1340 | .proc_handler = proc_nr_files, |
1da177e4 LT |
1341 | }, |
1342 | { | |
1da177e4 LT |
1343 | .procname = "file-max", |
1344 | .data = &files_stat.max_files, | |
1345 | .maxlen = sizeof(int), | |
1346 | .mode = 0644, | |
6d456111 | 1347 | .proc_handler = proc_dointvec, |
1da177e4 | 1348 | }, |
9cfe015a | 1349 | { |
9cfe015a ED |
1350 | .procname = "nr_open", |
1351 | .data = &sysctl_nr_open, | |
1352 | .maxlen = sizeof(int), | |
1353 | .mode = 0644, | |
6d456111 | 1354 | .proc_handler = proc_dointvec_minmax, |
eceea0b3 AV |
1355 | .extra1 = &sysctl_nr_open_min, |
1356 | .extra2 = &sysctl_nr_open_max, | |
9cfe015a | 1357 | }, |
1da177e4 | 1358 | { |
1da177e4 LT |
1359 | .procname = "dentry-state", |
1360 | .data = &dentry_stat, | |
1361 | .maxlen = 6*sizeof(int), | |
1362 | .mode = 0444, | |
6d456111 | 1363 | .proc_handler = proc_dointvec, |
1da177e4 LT |
1364 | }, |
1365 | { | |
1da177e4 LT |
1366 | .procname = "overflowuid", |
1367 | .data = &fs_overflowuid, | |
1368 | .maxlen = sizeof(int), | |
1369 | .mode = 0644, | |
6d456111 | 1370 | .proc_handler = proc_dointvec_minmax, |
1da177e4 LT |
1371 | .extra1 = &minolduid, |
1372 | .extra2 = &maxolduid, | |
1373 | }, | |
1374 | { | |
1da177e4 LT |
1375 | .procname = "overflowgid", |
1376 | .data = &fs_overflowgid, | |
1377 | .maxlen = sizeof(int), | |
1378 | .mode = 0644, | |
6d456111 | 1379 | .proc_handler = proc_dointvec_minmax, |
1da177e4 LT |
1380 | .extra1 = &minolduid, |
1381 | .extra2 = &maxolduid, | |
1382 | }, | |
bfcd17a6 | 1383 | #ifdef CONFIG_FILE_LOCKING |
1da177e4 | 1384 | { |
1da177e4 LT |
1385 | .procname = "leases-enable", |
1386 | .data = &leases_enable, | |
1387 | .maxlen = sizeof(int), | |
1388 | .mode = 0644, | |
6d456111 | 1389 | .proc_handler = proc_dointvec, |
1da177e4 | 1390 | }, |
bfcd17a6 | 1391 | #endif |
1da177e4 LT |
1392 | #ifdef CONFIG_DNOTIFY |
1393 | { | |
1da177e4 LT |
1394 | .procname = "dir-notify-enable", |
1395 | .data = &dir_notify_enable, | |
1396 | .maxlen = sizeof(int), | |
1397 | .mode = 0644, | |
6d456111 | 1398 | .proc_handler = proc_dointvec, |
1da177e4 LT |
1399 | }, |
1400 | #endif | |
1401 | #ifdef CONFIG_MMU | |
bfcd17a6 | 1402 | #ifdef CONFIG_FILE_LOCKING |
1da177e4 | 1403 | { |
1da177e4 LT |
1404 | .procname = "lease-break-time", |
1405 | .data = &lease_break_time, | |
1406 | .maxlen = sizeof(int), | |
1407 | .mode = 0644, | |
6d456111 | 1408 | .proc_handler = proc_dointvec, |
1da177e4 | 1409 | }, |
bfcd17a6 | 1410 | #endif |
ebf3f09c | 1411 | #ifdef CONFIG_AIO |
1da177e4 | 1412 | { |
1da177e4 LT |
1413 | .procname = "aio-nr", |
1414 | .data = &aio_nr, | |
1415 | .maxlen = sizeof(aio_nr), | |
1416 | .mode = 0444, | |
6d456111 | 1417 | .proc_handler = proc_doulongvec_minmax, |
1da177e4 LT |
1418 | }, |
1419 | { | |
1da177e4 LT |
1420 | .procname = "aio-max-nr", |
1421 | .data = &aio_max_nr, | |
1422 | .maxlen = sizeof(aio_max_nr), | |
1423 | .mode = 0644, | |
6d456111 | 1424 | .proc_handler = proc_doulongvec_minmax, |
1da177e4 | 1425 | }, |
ebf3f09c | 1426 | #endif /* CONFIG_AIO */ |
2d9048e2 | 1427 | #ifdef CONFIG_INOTIFY_USER |
0399cb08 | 1428 | { |
0399cb08 RL |
1429 | .procname = "inotify", |
1430 | .mode = 0555, | |
1431 | .child = inotify_table, | |
1432 | }, | |
1433 | #endif | |
7ef9964e DL |
1434 | #ifdef CONFIG_EPOLL |
1435 | { | |
1436 | .procname = "epoll", | |
1437 | .mode = 0555, | |
1438 | .child = epoll_table, | |
1439 | }, | |
1440 | #endif | |
1da177e4 | 1441 | #endif |
d6e71144 | 1442 | { |
d6e71144 AC |
1443 | .procname = "suid_dumpable", |
1444 | .data = &suid_dumpable, | |
1445 | .maxlen = sizeof(int), | |
1446 | .mode = 0644, | |
6d456111 | 1447 | .proc_handler = proc_dointvec_minmax, |
8e654fba MW |
1448 | .extra1 = &zero, |
1449 | .extra2 = &two, | |
d6e71144 | 1450 | }, |
2abc26fc EB |
1451 | #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) |
1452 | { | |
2abc26fc EB |
1453 | .procname = "binfmt_misc", |
1454 | .mode = 0555, | |
1455 | .child = binfmt_misc_table, | |
1456 | }, | |
1457 | #endif | |
b492e95b JA |
1458 | { |
1459 | .procname = "pipe-max-pages", | |
1460 | .data = &pipe_max_pages, | |
1461 | .maxlen = sizeof(int), | |
1462 | .mode = 0644, | |
1463 | .proc_handler = &proc_dointvec_minmax, | |
1464 | .extra1 = &two, | |
1465 | }, | |
2be7fe07 AM |
1466 | /* |
1467 | * NOTE: do not add new entries to this table unless you have read | |
1468 | * Documentation/sysctl/ctl_unnumbered.txt | |
2be7fe07 | 1469 | */ |
6fce56ec | 1470 | { } |
1da177e4 LT |
1471 | }; |
1472 | ||
d8217f07 | 1473 | static struct ctl_table debug_table[] = { |
ab3c68ee HC |
1474 | #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_SPARC) || \ |
1475 | defined(CONFIG_S390) | |
abd4f750 | 1476 | { |
abd4f750 MAS |
1477 | .procname = "exception-trace", |
1478 | .data = &show_unhandled_signals, | |
1479 | .maxlen = sizeof(int), | |
1480 | .mode = 0644, | |
1481 | .proc_handler = proc_dointvec | |
1482 | }, | |
b2be84df MH |
1483 | #endif |
1484 | #if defined(CONFIG_OPTPROBES) | |
1485 | { | |
1486 | .procname = "kprobes-optimization", | |
1487 | .data = &sysctl_kprobes_optimization, | |
1488 | .maxlen = sizeof(int), | |
1489 | .mode = 0644, | |
1490 | .proc_handler = proc_kprobes_optimization_handler, | |
1491 | .extra1 = &zero, | |
1492 | .extra2 = &one, | |
1493 | }, | |
abd4f750 | 1494 | #endif |
6fce56ec | 1495 | { } |
1da177e4 LT |
1496 | }; |
1497 | ||
d8217f07 | 1498 | static struct ctl_table dev_table[] = { |
6fce56ec | 1499 | { } |
0eeca283 | 1500 | }; |
1da177e4 | 1501 | |
330d57fb AV |
1502 | static DEFINE_SPINLOCK(sysctl_lock); |
1503 | ||
1504 | /* called under sysctl_lock */ | |
1505 | static int use_table(struct ctl_table_header *p) | |
1506 | { | |
1507 | if (unlikely(p->unregistering)) | |
1508 | return 0; | |
1509 | p->used++; | |
1510 | return 1; | |
1511 | } | |
1512 | ||
1513 | /* called under sysctl_lock */ | |
1514 | static void unuse_table(struct ctl_table_header *p) | |
1515 | { | |
1516 | if (!--p->used) | |
1517 | if (unlikely(p->unregistering)) | |
1518 | complete(p->unregistering); | |
1519 | } | |
1520 | ||
1521 | /* called under sysctl_lock, will reacquire if has to wait */ | |
1522 | static void start_unregistering(struct ctl_table_header *p) | |
1523 | { | |
1524 | /* | |
1525 | * if p->used is 0, nobody will ever touch that entry again; | |
1526 | * we'll eliminate all paths to it before dropping sysctl_lock | |
1527 | */ | |
1528 | if (unlikely(p->used)) { | |
1529 | struct completion wait; | |
1530 | init_completion(&wait); | |
1531 | p->unregistering = &wait; | |
1532 | spin_unlock(&sysctl_lock); | |
1533 | wait_for_completion(&wait); | |
1534 | spin_lock(&sysctl_lock); | |
f7e6ced4 AV |
1535 | } else { |
1536 | /* anything non-NULL; we'll never dereference it */ | |
1537 | p->unregistering = ERR_PTR(-EINVAL); | |
330d57fb AV |
1538 | } |
1539 | /* | |
1540 | * do not remove from the list until nobody holds it; walking the | |
1541 | * list in do_sysctl() relies on that. | |
1542 | */ | |
1543 | list_del_init(&p->ctl_entry); | |
1544 | } | |
1545 | ||
f7e6ced4 AV |
1546 | void sysctl_head_get(struct ctl_table_header *head) |
1547 | { | |
1548 | spin_lock(&sysctl_lock); | |
1549 | head->count++; | |
1550 | spin_unlock(&sysctl_lock); | |
1551 | } | |
1552 | ||
1553 | void sysctl_head_put(struct ctl_table_header *head) | |
1554 | { | |
1555 | spin_lock(&sysctl_lock); | |
1556 | if (!--head->count) | |
1557 | kfree(head); | |
1558 | spin_unlock(&sysctl_lock); | |
1559 | } | |
1560 | ||
1561 | struct ctl_table_header *sysctl_head_grab(struct ctl_table_header *head) | |
1562 | { | |
1563 | if (!head) | |
1564 | BUG(); | |
1565 | spin_lock(&sysctl_lock); | |
1566 | if (!use_table(head)) | |
1567 | head = ERR_PTR(-ENOENT); | |
1568 | spin_unlock(&sysctl_lock); | |
1569 | return head; | |
1570 | } | |
1571 | ||
805b5d5e EB |
1572 | void sysctl_head_finish(struct ctl_table_header *head) |
1573 | { | |
1574 | if (!head) | |
1575 | return; | |
1576 | spin_lock(&sysctl_lock); | |
1577 | unuse_table(head); | |
1578 | spin_unlock(&sysctl_lock); | |
1579 | } | |
1580 | ||
73455092 AV |
1581 | static struct ctl_table_set * |
1582 | lookup_header_set(struct ctl_table_root *root, struct nsproxy *namespaces) | |
1583 | { | |
1584 | struct ctl_table_set *set = &root->default_set; | |
1585 | if (root->lookup) | |
1586 | set = root->lookup(root, namespaces); | |
1587 | return set; | |
1588 | } | |
1589 | ||
e51b6ba0 EB |
1590 | static struct list_head * |
1591 | lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces) | |
805b5d5e | 1592 | { |
73455092 AV |
1593 | struct ctl_table_set *set = lookup_header_set(root, namespaces); |
1594 | return &set->list; | |
e51b6ba0 EB |
1595 | } |
1596 | ||
1597 | struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces, | |
1598 | struct ctl_table_header *prev) | |
1599 | { | |
1600 | struct ctl_table_root *root; | |
1601 | struct list_head *header_list; | |
805b5d5e EB |
1602 | struct ctl_table_header *head; |
1603 | struct list_head *tmp; | |
e51b6ba0 | 1604 | |
805b5d5e EB |
1605 | spin_lock(&sysctl_lock); |
1606 | if (prev) { | |
e51b6ba0 | 1607 | head = prev; |
805b5d5e EB |
1608 | tmp = &prev->ctl_entry; |
1609 | unuse_table(prev); | |
1610 | goto next; | |
1611 | } | |
1612 | tmp = &root_table_header.ctl_entry; | |
1613 | for (;;) { | |
1614 | head = list_entry(tmp, struct ctl_table_header, ctl_entry); | |
1615 | ||
1616 | if (!use_table(head)) | |
1617 | goto next; | |
1618 | spin_unlock(&sysctl_lock); | |
1619 | return head; | |
1620 | next: | |
e51b6ba0 | 1621 | root = head->root; |
805b5d5e | 1622 | tmp = tmp->next; |
e51b6ba0 EB |
1623 | header_list = lookup_header_list(root, namespaces); |
1624 | if (tmp != header_list) | |
1625 | continue; | |
1626 | ||
1627 | do { | |
1628 | root = list_entry(root->root_list.next, | |
1629 | struct ctl_table_root, root_list); | |
1630 | if (root == &sysctl_table_root) | |
1631 | goto out; | |
1632 | header_list = lookup_header_list(root, namespaces); | |
1633 | } while (list_empty(header_list)); | |
1634 | tmp = header_list->next; | |
805b5d5e | 1635 | } |
e51b6ba0 | 1636 | out: |
805b5d5e EB |
1637 | spin_unlock(&sysctl_lock); |
1638 | return NULL; | |
1639 | } | |
1640 | ||
e51b6ba0 EB |
1641 | struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev) |
1642 | { | |
1643 | return __sysctl_head_next(current->nsproxy, prev); | |
1644 | } | |
1645 | ||
1646 | void register_sysctl_root(struct ctl_table_root *root) | |
1647 | { | |
1648 | spin_lock(&sysctl_lock); | |
1649 | list_add_tail(&root->root_list, &sysctl_table_root.root_list); | |
1650 | spin_unlock(&sysctl_lock); | |
1651 | } | |
1652 | ||
1da177e4 | 1653 | /* |
1ff007eb | 1654 | * sysctl_perm does NOT grant the superuser all rights automatically, because |
1da177e4 LT |
1655 | * some sysctl variables are readonly even to root. |
1656 | */ | |
1657 | ||
1658 | static int test_perm(int mode, int op) | |
1659 | { | |
76aac0e9 | 1660 | if (!current_euid()) |
1da177e4 LT |
1661 | mode >>= 6; |
1662 | else if (in_egroup_p(0)) | |
1663 | mode >>= 3; | |
e6305c43 | 1664 | if ((op & ~mode & (MAY_READ|MAY_WRITE|MAY_EXEC)) == 0) |
1da177e4 LT |
1665 | return 0; |
1666 | return -EACCES; | |
1667 | } | |
1668 | ||
d7321cd6 | 1669 | int sysctl_perm(struct ctl_table_root *root, struct ctl_table *table, int op) |
1da177e4 LT |
1670 | { |
1671 | int error; | |
d7321cd6 PE |
1672 | int mode; |
1673 | ||
e6305c43 | 1674 | error = security_sysctl(table, op & (MAY_READ | MAY_WRITE | MAY_EXEC)); |
1da177e4 LT |
1675 | if (error) |
1676 | return error; | |
d7321cd6 PE |
1677 | |
1678 | if (root->permissions) | |
1679 | mode = root->permissions(root, current->nsproxy, table); | |
1680 | else | |
1681 | mode = table->mode; | |
1682 | ||
1683 | return test_perm(mode, op); | |
1da177e4 LT |
1684 | } |
1685 | ||
d912b0cc EB |
1686 | static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table) |
1687 | { | |
2315ffa0 | 1688 | for (; table->procname; table++) { |
d912b0cc EB |
1689 | table->parent = parent; |
1690 | if (table->child) | |
1691 | sysctl_set_parent(table, table->child); | |
1692 | } | |
1693 | } | |
1694 | ||
1695 | static __init int sysctl_init(void) | |
1696 | { | |
1697 | sysctl_set_parent(NULL, root_table); | |
88f458e4 HS |
1698 | #ifdef CONFIG_SYSCTL_SYSCALL_CHECK |
1699 | { | |
1700 | int err; | |
1701 | err = sysctl_check_table(current->nsproxy, root_table); | |
1702 | } | |
1703 | #endif | |
d912b0cc EB |
1704 | return 0; |
1705 | } | |
1706 | ||
1707 | core_initcall(sysctl_init); | |
1708 | ||
bfbcf034 AV |
1709 | static struct ctl_table *is_branch_in(struct ctl_table *branch, |
1710 | struct ctl_table *table) | |
ae7edecc AV |
1711 | { |
1712 | struct ctl_table *p; | |
1713 | const char *s = branch->procname; | |
1714 | ||
1715 | /* branch should have named subdirectory as its first element */ | |
1716 | if (!s || !branch->child) | |
bfbcf034 | 1717 | return NULL; |
ae7edecc AV |
1718 | |
1719 | /* ... and nothing else */ | |
2315ffa0 | 1720 | if (branch[1].procname) |
bfbcf034 | 1721 | return NULL; |
ae7edecc AV |
1722 | |
1723 | /* table should contain subdirectory with the same name */ | |
2315ffa0 | 1724 | for (p = table; p->procname; p++) { |
ae7edecc AV |
1725 | if (!p->child) |
1726 | continue; | |
1727 | if (p->procname && strcmp(p->procname, s) == 0) | |
bfbcf034 | 1728 | return p; |
ae7edecc | 1729 | } |
bfbcf034 | 1730 | return NULL; |
ae7edecc AV |
1731 | } |
1732 | ||
1733 | /* see if attaching q to p would be an improvement */ | |
1734 | static void try_attach(struct ctl_table_header *p, struct ctl_table_header *q) | |
1735 | { | |
1736 | struct ctl_table *to = p->ctl_table, *by = q->ctl_table; | |
bfbcf034 | 1737 | struct ctl_table *next; |
ae7edecc AV |
1738 | int is_better = 0; |
1739 | int not_in_parent = !p->attached_by; | |
1740 | ||
bfbcf034 | 1741 | while ((next = is_branch_in(by, to)) != NULL) { |
ae7edecc AV |
1742 | if (by == q->attached_by) |
1743 | is_better = 1; | |
1744 | if (to == p->attached_by) | |
1745 | not_in_parent = 1; | |
1746 | by = by->child; | |
bfbcf034 | 1747 | to = next->child; |
ae7edecc AV |
1748 | } |
1749 | ||
1750 | if (is_better && not_in_parent) { | |
1751 | q->attached_by = by; | |
1752 | q->attached_to = to; | |
1753 | q->parent = p; | |
1754 | } | |
1755 | } | |
1756 | ||
1da177e4 | 1757 | /** |
e51b6ba0 EB |
1758 | * __register_sysctl_paths - register a sysctl hierarchy |
1759 | * @root: List of sysctl headers to register on | |
1760 | * @namespaces: Data to compute which lists of sysctl entries are visible | |
29e796fd | 1761 | * @path: The path to the directory the sysctl table is in. |
1da177e4 | 1762 | * @table: the top-level table structure |
1da177e4 LT |
1763 | * |
1764 | * Register a sysctl table hierarchy. @table should be a filled in ctl_table | |
29e796fd | 1765 | * array. A completely 0 filled entry terminates the table. |
1da177e4 | 1766 | * |
d8217f07 | 1767 | * The members of the &struct ctl_table structure are used as follows: |
1da177e4 | 1768 | * |
1da177e4 LT |
1769 | * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not |
1770 | * enter a sysctl file | |
1771 | * | |
1772 | * data - a pointer to data for use by proc_handler | |
1773 | * | |
1774 | * maxlen - the maximum size in bytes of the data | |
1775 | * | |
1776 | * mode - the file permissions for the /proc/sys file, and for sysctl(2) | |
1777 | * | |
1778 | * child - a pointer to the child sysctl table if this entry is a directory, or | |
1779 | * %NULL. | |
1780 | * | |
1781 | * proc_handler - the text handler routine (described below) | |
1782 | * | |
1da177e4 LT |
1783 | * de - for internal use by the sysctl routines |
1784 | * | |
1785 | * extra1, extra2 - extra pointers usable by the proc handler routines | |
1786 | * | |
1787 | * Leaf nodes in the sysctl tree will be represented by a single file | |
1788 | * under /proc; non-leaf nodes will be represented by directories. | |
1789 | * | |
1790 | * sysctl(2) can automatically manage read and write requests through | |
1791 | * the sysctl table. The data and maxlen fields of the ctl_table | |
1792 | * struct enable minimal validation of the values being written to be | |
1793 | * performed, and the mode field allows minimal authentication. | |
1794 | * | |
1da177e4 LT |
1795 | * There must be a proc_handler routine for any terminal nodes |
1796 | * mirrored under /proc/sys (non-terminals are handled by a built-in | |
1797 | * directory handler). Several default handlers are available to | |
1798 | * cover common cases - | |
1799 | * | |
1800 | * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(), | |
1801 | * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(), | |
1802 | * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax() | |
1803 | * | |
1804 | * It is the handler's job to read the input buffer from user memory | |
1805 | * and process it. The handler should return 0 on success. | |
1806 | * | |
1807 | * This routine returns %NULL on a failure to register, and a pointer | |
1808 | * to the table header on success. | |
1809 | */ | |
e51b6ba0 EB |
1810 | struct ctl_table_header *__register_sysctl_paths( |
1811 | struct ctl_table_root *root, | |
1812 | struct nsproxy *namespaces, | |
1813 | const struct ctl_path *path, struct ctl_table *table) | |
1da177e4 | 1814 | { |
29e796fd EB |
1815 | struct ctl_table_header *header; |
1816 | struct ctl_table *new, **prevp; | |
1817 | unsigned int n, npath; | |
ae7edecc | 1818 | struct ctl_table_set *set; |
29e796fd EB |
1819 | |
1820 | /* Count the path components */ | |
2315ffa0 | 1821 | for (npath = 0; path[npath].procname; ++npath) |
29e796fd EB |
1822 | ; |
1823 | ||
1824 | /* | |
1825 | * For each path component, allocate a 2-element ctl_table array. | |
1826 | * The first array element will be filled with the sysctl entry | |
2315ffa0 | 1827 | * for this, the second will be the sentinel (procname == 0). |
29e796fd EB |
1828 | * |
1829 | * We allocate everything in one go so that we don't have to | |
1830 | * worry about freeing additional memory in unregister_sysctl_table. | |
1831 | */ | |
1832 | header = kzalloc(sizeof(struct ctl_table_header) + | |
1833 | (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL); | |
1834 | if (!header) | |
1da177e4 | 1835 | return NULL; |
29e796fd EB |
1836 | |
1837 | new = (struct ctl_table *) (header + 1); | |
1838 | ||
1839 | /* Now connect the dots */ | |
1840 | prevp = &header->ctl_table; | |
1841 | for (n = 0; n < npath; ++n, ++path) { | |
1842 | /* Copy the procname */ | |
1843 | new->procname = path->procname; | |
29e796fd EB |
1844 | new->mode = 0555; |
1845 | ||
1846 | *prevp = new; | |
1847 | prevp = &new->child; | |
1848 | ||
1849 | new += 2; | |
1850 | } | |
1851 | *prevp = table; | |
23eb06de | 1852 | header->ctl_table_arg = table; |
29e796fd EB |
1853 | |
1854 | INIT_LIST_HEAD(&header->ctl_entry); | |
1855 | header->used = 0; | |
1856 | header->unregistering = NULL; | |
e51b6ba0 | 1857 | header->root = root; |
29e796fd | 1858 | sysctl_set_parent(NULL, header->ctl_table); |
f7e6ced4 | 1859 | header->count = 1; |
88f458e4 | 1860 | #ifdef CONFIG_SYSCTL_SYSCALL_CHECK |
e51b6ba0 | 1861 | if (sysctl_check_table(namespaces, header->ctl_table)) { |
29e796fd | 1862 | kfree(header); |
fc6cd25b EB |
1863 | return NULL; |
1864 | } | |
88f458e4 | 1865 | #endif |
330d57fb | 1866 | spin_lock(&sysctl_lock); |
73455092 | 1867 | header->set = lookup_header_set(root, namespaces); |
ae7edecc AV |
1868 | header->attached_by = header->ctl_table; |
1869 | header->attached_to = root_table; | |
1870 | header->parent = &root_table_header; | |
1871 | for (set = header->set; set; set = set->parent) { | |
1872 | struct ctl_table_header *p; | |
1873 | list_for_each_entry(p, &set->list, ctl_entry) { | |
1874 | if (p->unregistering) | |
1875 | continue; | |
1876 | try_attach(p, header); | |
1877 | } | |
1878 | } | |
1879 | header->parent->count++; | |
73455092 | 1880 | list_add_tail(&header->ctl_entry, &header->set->list); |
330d57fb | 1881 | spin_unlock(&sysctl_lock); |
29e796fd EB |
1882 | |
1883 | return header; | |
1884 | } | |
1885 | ||
e51b6ba0 EB |
1886 | /** |
1887 | * register_sysctl_table_path - register a sysctl table hierarchy | |
1888 | * @path: The path to the directory the sysctl table is in. | |
1889 | * @table: the top-level table structure | |
1890 | * | |
1891 | * Register a sysctl table hierarchy. @table should be a filled in ctl_table | |
1892 | * array. A completely 0 filled entry terminates the table. | |
1893 | * | |
1894 | * See __register_sysctl_paths for more details. | |
1895 | */ | |
1896 | struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path, | |
1897 | struct ctl_table *table) | |
1898 | { | |
1899 | return __register_sysctl_paths(&sysctl_table_root, current->nsproxy, | |
1900 | path, table); | |
1901 | } | |
1902 | ||
29e796fd EB |
1903 | /** |
1904 | * register_sysctl_table - register a sysctl table hierarchy | |
1905 | * @table: the top-level table structure | |
1906 | * | |
1907 | * Register a sysctl table hierarchy. @table should be a filled in ctl_table | |
1908 | * array. A completely 0 filled entry terminates the table. | |
1909 | * | |
1910 | * See register_sysctl_paths for more details. | |
1911 | */ | |
1912 | struct ctl_table_header *register_sysctl_table(struct ctl_table *table) | |
1913 | { | |
1914 | static const struct ctl_path null_path[] = { {} }; | |
1915 | ||
1916 | return register_sysctl_paths(null_path, table); | |
1da177e4 LT |
1917 | } |
1918 | ||
1919 | /** | |
1920 | * unregister_sysctl_table - unregister a sysctl table hierarchy | |
1921 | * @header: the header returned from register_sysctl_table | |
1922 | * | |
1923 | * Unregisters the sysctl table and all children. proc entries may not | |
1924 | * actually be removed until they are no longer used by anyone. | |
1925 | */ | |
1926 | void unregister_sysctl_table(struct ctl_table_header * header) | |
1927 | { | |
330d57fb | 1928 | might_sleep(); |
f1dad166 PE |
1929 | |
1930 | if (header == NULL) | |
1931 | return; | |
1932 | ||
330d57fb AV |
1933 | spin_lock(&sysctl_lock); |
1934 | start_unregistering(header); | |
ae7edecc AV |
1935 | if (!--header->parent->count) { |
1936 | WARN_ON(1); | |
1937 | kfree(header->parent); | |
1938 | } | |
f7e6ced4 AV |
1939 | if (!--header->count) |
1940 | kfree(header); | |
330d57fb | 1941 | spin_unlock(&sysctl_lock); |
1da177e4 LT |
1942 | } |
1943 | ||
9043476f AV |
1944 | int sysctl_is_seen(struct ctl_table_header *p) |
1945 | { | |
1946 | struct ctl_table_set *set = p->set; | |
1947 | int res; | |
1948 | spin_lock(&sysctl_lock); | |
1949 | if (p->unregistering) | |
1950 | res = 0; | |
1951 | else if (!set->is_seen) | |
1952 | res = 1; | |
1953 | else | |
1954 | res = set->is_seen(set); | |
1955 | spin_unlock(&sysctl_lock); | |
1956 | return res; | |
1957 | } | |
1958 | ||
73455092 AV |
1959 | void setup_sysctl_set(struct ctl_table_set *p, |
1960 | struct ctl_table_set *parent, | |
1961 | int (*is_seen)(struct ctl_table_set *)) | |
1962 | { | |
1963 | INIT_LIST_HEAD(&p->list); | |
1964 | p->parent = parent ? parent : &sysctl_table_root.default_set; | |
1965 | p->is_seen = is_seen; | |
1966 | } | |
1967 | ||
b89a8171 | 1968 | #else /* !CONFIG_SYSCTL */ |
d8217f07 | 1969 | struct ctl_table_header *register_sysctl_table(struct ctl_table * table) |
b89a8171 EB |
1970 | { |
1971 | return NULL; | |
1972 | } | |
1973 | ||
29e796fd EB |
1974 | struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path, |
1975 | struct ctl_table *table) | |
1976 | { | |
1977 | return NULL; | |
1978 | } | |
1979 | ||
b89a8171 EB |
1980 | void unregister_sysctl_table(struct ctl_table_header * table) |
1981 | { | |
1982 | } | |
1983 | ||
73455092 AV |
1984 | void setup_sysctl_set(struct ctl_table_set *p, |
1985 | struct ctl_table_set *parent, | |
1986 | int (*is_seen)(struct ctl_table_set *)) | |
1987 | { | |
1988 | } | |
1989 | ||
f7e6ced4 AV |
1990 | void sysctl_head_put(struct ctl_table_header *head) |
1991 | { | |
1992 | } | |
1993 | ||
b89a8171 EB |
1994 | #endif /* CONFIG_SYSCTL */ |
1995 | ||
1da177e4 LT |
1996 | /* |
1997 | * /proc/sys support | |
1998 | */ | |
1999 | ||
b89a8171 | 2000 | #ifdef CONFIG_PROC_SYSCTL |
1da177e4 | 2001 | |
b1ba4ddd | 2002 | static int _proc_do_string(void* data, int maxlen, int write, |
8d65af78 | 2003 | void __user *buffer, |
b1ba4ddd | 2004 | size_t *lenp, loff_t *ppos) |
1da177e4 LT |
2005 | { |
2006 | size_t len; | |
2007 | char __user *p; | |
2008 | char c; | |
8d060877 ON |
2009 | |
2010 | if (!data || !maxlen || !*lenp) { | |
1da177e4 LT |
2011 | *lenp = 0; |
2012 | return 0; | |
2013 | } | |
8d060877 | 2014 | |
1da177e4 LT |
2015 | if (write) { |
2016 | len = 0; | |
2017 | p = buffer; | |
2018 | while (len < *lenp) { | |
2019 | if (get_user(c, p++)) | |
2020 | return -EFAULT; | |
2021 | if (c == 0 || c == '\n') | |
2022 | break; | |
2023 | len++; | |
2024 | } | |
f5dd3d6f SV |
2025 | if (len >= maxlen) |
2026 | len = maxlen-1; | |
2027 | if(copy_from_user(data, buffer, len)) | |
1da177e4 | 2028 | return -EFAULT; |
f5dd3d6f | 2029 | ((char *) data)[len] = 0; |
1da177e4 LT |
2030 | *ppos += *lenp; |
2031 | } else { | |
f5dd3d6f SV |
2032 | len = strlen(data); |
2033 | if (len > maxlen) | |
2034 | len = maxlen; | |
8d060877 ON |
2035 | |
2036 | if (*ppos > len) { | |
2037 | *lenp = 0; | |
2038 | return 0; | |
2039 | } | |
2040 | ||
2041 | data += *ppos; | |
2042 | len -= *ppos; | |
2043 | ||
1da177e4 LT |
2044 | if (len > *lenp) |
2045 | len = *lenp; | |
2046 | if (len) | |
f5dd3d6f | 2047 | if(copy_to_user(buffer, data, len)) |
1da177e4 LT |
2048 | return -EFAULT; |
2049 | if (len < *lenp) { | |
2050 | if(put_user('\n', ((char __user *) buffer) + len)) | |
2051 | return -EFAULT; | |
2052 | len++; | |
2053 | } | |
2054 | *lenp = len; | |
2055 | *ppos += len; | |
2056 | } | |
2057 | return 0; | |
2058 | } | |
2059 | ||
f5dd3d6f SV |
2060 | /** |
2061 | * proc_dostring - read a string sysctl | |
2062 | * @table: the sysctl table | |
2063 | * @write: %TRUE if this is a write to the sysctl file | |
f5dd3d6f SV |
2064 | * @buffer: the user buffer |
2065 | * @lenp: the size of the user buffer | |
2066 | * @ppos: file position | |
2067 | * | |
2068 | * Reads/writes a string from/to the user buffer. If the kernel | |
2069 | * buffer provided is not large enough to hold the string, the | |
2070 | * string is truncated. The copied string is %NULL-terminated. | |
2071 | * If the string is being read by the user process, it is copied | |
2072 | * and a newline '\n' is added. It is truncated if the buffer is | |
2073 | * not large enough. | |
2074 | * | |
2075 | * Returns 0 on success. | |
2076 | */ | |
8d65af78 | 2077 | int proc_dostring(struct ctl_table *table, int write, |
f5dd3d6f SV |
2078 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2079 | { | |
8d65af78 | 2080 | return _proc_do_string(table->data, table->maxlen, write, |
f5dd3d6f SV |
2081 | buffer, lenp, ppos); |
2082 | } | |
2083 | ||
00b7c339 AW |
2084 | static size_t proc_skip_spaces(char **buf) |
2085 | { | |
2086 | size_t ret; | |
2087 | char *tmp = skip_spaces(*buf); | |
2088 | ret = tmp - *buf; | |
2089 | *buf = tmp; | |
2090 | return ret; | |
2091 | } | |
2092 | ||
9f977fb7 OP |
2093 | static void proc_skip_char(char **buf, size_t *size, const char v) |
2094 | { | |
2095 | while (*size) { | |
2096 | if (**buf != v) | |
2097 | break; | |
2098 | (*size)--; | |
2099 | (*buf)++; | |
2100 | } | |
2101 | } | |
2102 | ||
00b7c339 AW |
2103 | #define TMPBUFLEN 22 |
2104 | /** | |
0fc377bd | 2105 | * proc_get_long - reads an ASCII formatted integer from a user buffer |
00b7c339 | 2106 | * |
0fc377bd RD |
2107 | * @buf: a kernel buffer |
2108 | * @size: size of the kernel buffer | |
2109 | * @val: this is where the number will be stored | |
2110 | * @neg: set to %TRUE if number is negative | |
2111 | * @perm_tr: a vector which contains the allowed trailers | |
2112 | * @perm_tr_len: size of the perm_tr vector | |
2113 | * @tr: pointer to store the trailer character | |
00b7c339 | 2114 | * |
0fc377bd RD |
2115 | * In case of success %0 is returned and @buf and @size are updated with |
2116 | * the amount of bytes read. If @tr is non-NULL and a trailing | |
2117 | * character exists (size is non-zero after returning from this | |
2118 | * function), @tr is updated with the trailing character. | |
00b7c339 AW |
2119 | */ |
2120 | static int proc_get_long(char **buf, size_t *size, | |
2121 | unsigned long *val, bool *neg, | |
2122 | const char *perm_tr, unsigned perm_tr_len, char *tr) | |
2123 | { | |
2124 | int len; | |
2125 | char *p, tmp[TMPBUFLEN]; | |
2126 | ||
2127 | if (!*size) | |
2128 | return -EINVAL; | |
2129 | ||
2130 | len = *size; | |
2131 | if (len > TMPBUFLEN - 1) | |
2132 | len = TMPBUFLEN - 1; | |
2133 | ||
2134 | memcpy(tmp, *buf, len); | |
2135 | ||
2136 | tmp[len] = 0; | |
2137 | p = tmp; | |
2138 | if (*p == '-' && *size > 1) { | |
2139 | *neg = true; | |
2140 | p++; | |
2141 | } else | |
2142 | *neg = false; | |
2143 | if (!isdigit(*p)) | |
2144 | return -EINVAL; | |
2145 | ||
2146 | *val = simple_strtoul(p, &p, 0); | |
2147 | ||
2148 | len = p - tmp; | |
2149 | ||
2150 | /* We don't know if the next char is whitespace thus we may accept | |
2151 | * invalid integers (e.g. 1234...a) or two integers instead of one | |
2152 | * (e.g. 123...1). So lets not allow such large numbers. */ | |
2153 | if (len == TMPBUFLEN - 1) | |
2154 | return -EINVAL; | |
2155 | ||
2156 | if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len)) | |
2157 | return -EINVAL; | |
1da177e4 | 2158 | |
00b7c339 AW |
2159 | if (tr && (len < *size)) |
2160 | *tr = *p; | |
2161 | ||
2162 | *buf += len; | |
2163 | *size -= len; | |
2164 | ||
2165 | return 0; | |
2166 | } | |
2167 | ||
2168 | /** | |
0fc377bd | 2169 | * proc_put_long - converts an integer to a decimal ASCII formatted string |
00b7c339 | 2170 | * |
0fc377bd RD |
2171 | * @buf: the user buffer |
2172 | * @size: the size of the user buffer | |
2173 | * @val: the integer to be converted | |
2174 | * @neg: sign of the number, %TRUE for negative | |
00b7c339 | 2175 | * |
0fc377bd RD |
2176 | * In case of success %0 is returned and @buf and @size are updated with |
2177 | * the amount of bytes written. | |
00b7c339 AW |
2178 | */ |
2179 | static int proc_put_long(void __user **buf, size_t *size, unsigned long val, | |
2180 | bool neg) | |
2181 | { | |
2182 | int len; | |
2183 | char tmp[TMPBUFLEN], *p = tmp; | |
2184 | ||
2185 | sprintf(p, "%s%lu", neg ? "-" : "", val); | |
2186 | len = strlen(tmp); | |
2187 | if (len > *size) | |
2188 | len = *size; | |
2189 | if (copy_to_user(*buf, tmp, len)) | |
2190 | return -EFAULT; | |
2191 | *size -= len; | |
2192 | *buf += len; | |
2193 | return 0; | |
2194 | } | |
2195 | #undef TMPBUFLEN | |
2196 | ||
2197 | static int proc_put_char(void __user **buf, size_t *size, char c) | |
2198 | { | |
2199 | if (*size) { | |
2200 | char __user **buffer = (char __user **)buf; | |
2201 | if (put_user(c, *buffer)) | |
2202 | return -EFAULT; | |
2203 | (*size)--, (*buffer)++; | |
2204 | *buf = *buffer; | |
2205 | } | |
2206 | return 0; | |
2207 | } | |
1da177e4 | 2208 | |
00b7c339 | 2209 | static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp, |
1da177e4 LT |
2210 | int *valp, |
2211 | int write, void *data) | |
2212 | { | |
2213 | if (write) { | |
2214 | *valp = *negp ? -*lvalp : *lvalp; | |
2215 | } else { | |
2216 | int val = *valp; | |
2217 | if (val < 0) { | |
00b7c339 | 2218 | *negp = true; |
1da177e4 LT |
2219 | *lvalp = (unsigned long)-val; |
2220 | } else { | |
00b7c339 | 2221 | *negp = false; |
1da177e4 LT |
2222 | *lvalp = (unsigned long)val; |
2223 | } | |
2224 | } | |
2225 | return 0; | |
2226 | } | |
2227 | ||
00b7c339 AW |
2228 | static const char proc_wspace_sep[] = { ' ', '\t', '\n' }; |
2229 | ||
d8217f07 | 2230 | static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table, |
8d65af78 | 2231 | int write, void __user *buffer, |
fcfbd547 | 2232 | size_t *lenp, loff_t *ppos, |
00b7c339 | 2233 | int (*conv)(bool *negp, unsigned long *lvalp, int *valp, |
1da177e4 LT |
2234 | int write, void *data), |
2235 | void *data) | |
2236 | { | |
00b7c339 AW |
2237 | int *i, vleft, first = 1, err = 0; |
2238 | unsigned long page = 0; | |
2239 | size_t left; | |
2240 | char *kbuf; | |
1da177e4 | 2241 | |
00b7c339 | 2242 | if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) { |
1da177e4 LT |
2243 | *lenp = 0; |
2244 | return 0; | |
2245 | } | |
2246 | ||
fcfbd547 | 2247 | i = (int *) tbl_data; |
1da177e4 LT |
2248 | vleft = table->maxlen / sizeof(*i); |
2249 | left = *lenp; | |
2250 | ||
2251 | if (!conv) | |
2252 | conv = do_proc_dointvec_conv; | |
2253 | ||
00b7c339 AW |
2254 | if (write) { |
2255 | if (left > PAGE_SIZE - 1) | |
2256 | left = PAGE_SIZE - 1; | |
2257 | page = __get_free_page(GFP_TEMPORARY); | |
2258 | kbuf = (char *) page; | |
2259 | if (!kbuf) | |
2260 | return -ENOMEM; | |
2261 | if (copy_from_user(kbuf, buffer, left)) { | |
2262 | err = -EFAULT; | |
2263 | goto free; | |
2264 | } | |
2265 | kbuf[left] = 0; | |
2266 | } | |
2267 | ||
1da177e4 | 2268 | for (; left && vleft--; i++, first=0) { |
00b7c339 AW |
2269 | unsigned long lval; |
2270 | bool neg; | |
1da177e4 | 2271 | |
00b7c339 AW |
2272 | if (write) { |
2273 | left -= proc_skip_spaces(&kbuf); | |
1da177e4 | 2274 | |
00b7c339 AW |
2275 | err = proc_get_long(&kbuf, &left, &lval, &neg, |
2276 | proc_wspace_sep, | |
2277 | sizeof(proc_wspace_sep), NULL); | |
2278 | if (err) | |
1da177e4 | 2279 | break; |
00b7c339 AW |
2280 | if (conv(&neg, &lval, i, 1, data)) { |
2281 | err = -EINVAL; | |
1da177e4 | 2282 | break; |
00b7c339 | 2283 | } |
1da177e4 | 2284 | } else { |
00b7c339 AW |
2285 | if (conv(&neg, &lval, i, 0, data)) { |
2286 | err = -EINVAL; | |
2287 | break; | |
2288 | } | |
1da177e4 | 2289 | if (!first) |
00b7c339 AW |
2290 | err = proc_put_char(&buffer, &left, '\t'); |
2291 | if (err) | |
2292 | break; | |
2293 | err = proc_put_long(&buffer, &left, lval, neg); | |
2294 | if (err) | |
1da177e4 | 2295 | break; |
1da177e4 LT |
2296 | } |
2297 | } | |
2298 | ||
00b7c339 AW |
2299 | if (!write && !first && left && !err) |
2300 | err = proc_put_char(&buffer, &left, '\n'); | |
2301 | if (write && !err) | |
2302 | left -= proc_skip_spaces(&kbuf); | |
2303 | free: | |
1da177e4 | 2304 | if (write) { |
00b7c339 AW |
2305 | free_page(page); |
2306 | if (first) | |
2307 | return err ? : -EINVAL; | |
1da177e4 | 2308 | } |
1da177e4 LT |
2309 | *lenp -= left; |
2310 | *ppos += *lenp; | |
00b7c339 | 2311 | return err; |
1da177e4 LT |
2312 | } |
2313 | ||
8d65af78 | 2314 | static int do_proc_dointvec(struct ctl_table *table, int write, |
fcfbd547 | 2315 | void __user *buffer, size_t *lenp, loff_t *ppos, |
00b7c339 | 2316 | int (*conv)(bool *negp, unsigned long *lvalp, int *valp, |
fcfbd547 KK |
2317 | int write, void *data), |
2318 | void *data) | |
2319 | { | |
8d65af78 | 2320 | return __do_proc_dointvec(table->data, table, write, |
fcfbd547 KK |
2321 | buffer, lenp, ppos, conv, data); |
2322 | } | |
2323 | ||
1da177e4 LT |
2324 | /** |
2325 | * proc_dointvec - read a vector of integers | |
2326 | * @table: the sysctl table | |
2327 | * @write: %TRUE if this is a write to the sysctl file | |
1da177e4 LT |
2328 | * @buffer: the user buffer |
2329 | * @lenp: the size of the user buffer | |
2330 | * @ppos: file position | |
2331 | * | |
2332 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer | |
2333 | * values from/to the user buffer, treated as an ASCII string. | |
2334 | * | |
2335 | * Returns 0 on success. | |
2336 | */ | |
8d65af78 | 2337 | int proc_dointvec(struct ctl_table *table, int write, |
1da177e4 LT |
2338 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2339 | { | |
8d65af78 | 2340 | return do_proc_dointvec(table,write,buffer,lenp,ppos, |
1da177e4 LT |
2341 | NULL,NULL); |
2342 | } | |
2343 | ||
34f5a398 | 2344 | /* |
25ddbb18 AK |
2345 | * Taint values can only be increased |
2346 | * This means we can safely use a temporary. | |
34f5a398 | 2347 | */ |
8d65af78 | 2348 | static int proc_taint(struct ctl_table *table, int write, |
34f5a398 TT |
2349 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2350 | { | |
25ddbb18 AK |
2351 | struct ctl_table t; |
2352 | unsigned long tmptaint = get_taint(); | |
2353 | int err; | |
34f5a398 | 2354 | |
91fcd412 | 2355 | if (write && !capable(CAP_SYS_ADMIN)) |
34f5a398 TT |
2356 | return -EPERM; |
2357 | ||
25ddbb18 AK |
2358 | t = *table; |
2359 | t.data = &tmptaint; | |
8d65af78 | 2360 | err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos); |
25ddbb18 AK |
2361 | if (err < 0) |
2362 | return err; | |
2363 | ||
2364 | if (write) { | |
2365 | /* | |
2366 | * Poor man's atomic or. Not worth adding a primitive | |
2367 | * to everyone's atomic.h for this | |
2368 | */ | |
2369 | int i; | |
2370 | for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) { | |
2371 | if ((tmptaint >> i) & 1) | |
2372 | add_taint(i); | |
2373 | } | |
2374 | } | |
2375 | ||
2376 | return err; | |
34f5a398 TT |
2377 | } |
2378 | ||
1da177e4 LT |
2379 | struct do_proc_dointvec_minmax_conv_param { |
2380 | int *min; | |
2381 | int *max; | |
2382 | }; | |
2383 | ||
00b7c339 AW |
2384 | static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp, |
2385 | int *valp, | |
1da177e4 LT |
2386 | int write, void *data) |
2387 | { | |
2388 | struct do_proc_dointvec_minmax_conv_param *param = data; | |
2389 | if (write) { | |
2390 | int val = *negp ? -*lvalp : *lvalp; | |
2391 | if ((param->min && *param->min > val) || | |
2392 | (param->max && *param->max < val)) | |
2393 | return -EINVAL; | |
2394 | *valp = val; | |
2395 | } else { | |
2396 | int val = *valp; | |
2397 | if (val < 0) { | |
00b7c339 | 2398 | *negp = true; |
1da177e4 LT |
2399 | *lvalp = (unsigned long)-val; |
2400 | } else { | |
00b7c339 | 2401 | *negp = false; |
1da177e4 LT |
2402 | *lvalp = (unsigned long)val; |
2403 | } | |
2404 | } | |
2405 | return 0; | |
2406 | } | |
2407 | ||
2408 | /** | |
2409 | * proc_dointvec_minmax - read a vector of integers with min/max values | |
2410 | * @table: the sysctl table | |
2411 | * @write: %TRUE if this is a write to the sysctl file | |
1da177e4 LT |
2412 | * @buffer: the user buffer |
2413 | * @lenp: the size of the user buffer | |
2414 | * @ppos: file position | |
2415 | * | |
2416 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer | |
2417 | * values from/to the user buffer, treated as an ASCII string. | |
2418 | * | |
2419 | * This routine will ensure the values are within the range specified by | |
2420 | * table->extra1 (min) and table->extra2 (max). | |
2421 | * | |
2422 | * Returns 0 on success. | |
2423 | */ | |
8d65af78 | 2424 | int proc_dointvec_minmax(struct ctl_table *table, int write, |
1da177e4 LT |
2425 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2426 | { | |
2427 | struct do_proc_dointvec_minmax_conv_param param = { | |
2428 | .min = (int *) table->extra1, | |
2429 | .max = (int *) table->extra2, | |
2430 | }; | |
8d65af78 | 2431 | return do_proc_dointvec(table, write, buffer, lenp, ppos, |
1da177e4 LT |
2432 | do_proc_dointvec_minmax_conv, ¶m); |
2433 | } | |
2434 | ||
d8217f07 | 2435 | static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write, |
1da177e4 LT |
2436 | void __user *buffer, |
2437 | size_t *lenp, loff_t *ppos, | |
2438 | unsigned long convmul, | |
2439 | unsigned long convdiv) | |
2440 | { | |
00b7c339 AW |
2441 | unsigned long *i, *min, *max; |
2442 | int vleft, first = 1, err = 0; | |
2443 | unsigned long page = 0; | |
2444 | size_t left; | |
2445 | char *kbuf; | |
2446 | ||
2447 | if (!data || !table->maxlen || !*lenp || (*ppos && !write)) { | |
1da177e4 LT |
2448 | *lenp = 0; |
2449 | return 0; | |
2450 | } | |
00b7c339 | 2451 | |
fcfbd547 | 2452 | i = (unsigned long *) data; |
1da177e4 LT |
2453 | min = (unsigned long *) table->extra1; |
2454 | max = (unsigned long *) table->extra2; | |
2455 | vleft = table->maxlen / sizeof(unsigned long); | |
2456 | left = *lenp; | |
00b7c339 AW |
2457 | |
2458 | if (write) { | |
2459 | if (left > PAGE_SIZE - 1) | |
2460 | left = PAGE_SIZE - 1; | |
2461 | page = __get_free_page(GFP_TEMPORARY); | |
2462 | kbuf = (char *) page; | |
2463 | if (!kbuf) | |
2464 | return -ENOMEM; | |
2465 | if (copy_from_user(kbuf, buffer, left)) { | |
2466 | err = -EFAULT; | |
2467 | goto free; | |
2468 | } | |
2469 | kbuf[left] = 0; | |
2470 | } | |
2471 | ||
1da177e4 | 2472 | for (; left && vleft--; i++, min++, max++, first=0) { |
00b7c339 AW |
2473 | unsigned long val; |
2474 | ||
1da177e4 | 2475 | if (write) { |
00b7c339 AW |
2476 | bool neg; |
2477 | ||
2478 | left -= proc_skip_spaces(&kbuf); | |
2479 | ||
2480 | err = proc_get_long(&kbuf, &left, &val, &neg, | |
2481 | proc_wspace_sep, | |
2482 | sizeof(proc_wspace_sep), NULL); | |
2483 | if (err) | |
1da177e4 LT |
2484 | break; |
2485 | if (neg) | |
1da177e4 LT |
2486 | continue; |
2487 | if ((min && val < *min) || (max && val > *max)) | |
2488 | continue; | |
2489 | *i = val; | |
2490 | } else { | |
00b7c339 | 2491 | val = convdiv * (*i) / convmul; |
1da177e4 | 2492 | if (!first) |
00b7c339 AW |
2493 | err = proc_put_char(&buffer, &left, '\t'); |
2494 | err = proc_put_long(&buffer, &left, val, false); | |
2495 | if (err) | |
2496 | break; | |
1da177e4 LT |
2497 | } |
2498 | } | |
2499 | ||
00b7c339 AW |
2500 | if (!write && !first && left && !err) |
2501 | err = proc_put_char(&buffer, &left, '\n'); | |
2502 | if (write && !err) | |
2503 | left -= proc_skip_spaces(&kbuf); | |
2504 | free: | |
1da177e4 | 2505 | if (write) { |
00b7c339 AW |
2506 | free_page(page); |
2507 | if (first) | |
2508 | return err ? : -EINVAL; | |
1da177e4 | 2509 | } |
1da177e4 LT |
2510 | *lenp -= left; |
2511 | *ppos += *lenp; | |
00b7c339 | 2512 | return err; |
1da177e4 LT |
2513 | } |
2514 | ||
d8217f07 | 2515 | static int do_proc_doulongvec_minmax(struct ctl_table *table, int write, |
fcfbd547 KK |
2516 | void __user *buffer, |
2517 | size_t *lenp, loff_t *ppos, | |
2518 | unsigned long convmul, | |
2519 | unsigned long convdiv) | |
2520 | { | |
2521 | return __do_proc_doulongvec_minmax(table->data, table, write, | |
8d65af78 | 2522 | buffer, lenp, ppos, convmul, convdiv); |
fcfbd547 KK |
2523 | } |
2524 | ||
1da177e4 LT |
2525 | /** |
2526 | * proc_doulongvec_minmax - read a vector of long integers with min/max values | |
2527 | * @table: the sysctl table | |
2528 | * @write: %TRUE if this is a write to the sysctl file | |
1da177e4 LT |
2529 | * @buffer: the user buffer |
2530 | * @lenp: the size of the user buffer | |
2531 | * @ppos: file position | |
2532 | * | |
2533 | * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long | |
2534 | * values from/to the user buffer, treated as an ASCII string. | |
2535 | * | |
2536 | * This routine will ensure the values are within the range specified by | |
2537 | * table->extra1 (min) and table->extra2 (max). | |
2538 | * | |
2539 | * Returns 0 on success. | |
2540 | */ | |
8d65af78 | 2541 | int proc_doulongvec_minmax(struct ctl_table *table, int write, |
1da177e4 LT |
2542 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2543 | { | |
8d65af78 | 2544 | return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l); |
1da177e4 LT |
2545 | } |
2546 | ||
2547 | /** | |
2548 | * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values | |
2549 | * @table: the sysctl table | |
2550 | * @write: %TRUE if this is a write to the sysctl file | |
1da177e4 LT |
2551 | * @buffer: the user buffer |
2552 | * @lenp: the size of the user buffer | |
2553 | * @ppos: file position | |
2554 | * | |
2555 | * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long | |
2556 | * values from/to the user buffer, treated as an ASCII string. The values | |
2557 | * are treated as milliseconds, and converted to jiffies when they are stored. | |
2558 | * | |
2559 | * This routine will ensure the values are within the range specified by | |
2560 | * table->extra1 (min) and table->extra2 (max). | |
2561 | * | |
2562 | * Returns 0 on success. | |
2563 | */ | |
d8217f07 | 2564 | int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, |
1da177e4 LT |
2565 | void __user *buffer, |
2566 | size_t *lenp, loff_t *ppos) | |
2567 | { | |
8d65af78 | 2568 | return do_proc_doulongvec_minmax(table, write, buffer, |
1da177e4 LT |
2569 | lenp, ppos, HZ, 1000l); |
2570 | } | |
2571 | ||
2572 | ||
00b7c339 | 2573 | static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp, |
1da177e4 LT |
2574 | int *valp, |
2575 | int write, void *data) | |
2576 | { | |
2577 | if (write) { | |
cba9f33d BS |
2578 | if (*lvalp > LONG_MAX / HZ) |
2579 | return 1; | |
1da177e4 LT |
2580 | *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ); |
2581 | } else { | |
2582 | int val = *valp; | |
2583 | unsigned long lval; | |
2584 | if (val < 0) { | |
00b7c339 | 2585 | *negp = true; |
1da177e4 LT |
2586 | lval = (unsigned long)-val; |
2587 | } else { | |
00b7c339 | 2588 | *negp = false; |
1da177e4 LT |
2589 | lval = (unsigned long)val; |
2590 | } | |
2591 | *lvalp = lval / HZ; | |
2592 | } | |
2593 | return 0; | |
2594 | } | |
2595 | ||
00b7c339 | 2596 | static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp, |
1da177e4 LT |
2597 | int *valp, |
2598 | int write, void *data) | |
2599 | { | |
2600 | if (write) { | |
cba9f33d BS |
2601 | if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ) |
2602 | return 1; | |
1da177e4 LT |
2603 | *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp); |
2604 | } else { | |
2605 | int val = *valp; | |
2606 | unsigned long lval; | |
2607 | if (val < 0) { | |
00b7c339 | 2608 | *negp = true; |
1da177e4 LT |
2609 | lval = (unsigned long)-val; |
2610 | } else { | |
00b7c339 | 2611 | *negp = false; |
1da177e4 LT |
2612 | lval = (unsigned long)val; |
2613 | } | |
2614 | *lvalp = jiffies_to_clock_t(lval); | |
2615 | } | |
2616 | return 0; | |
2617 | } | |
2618 | ||
00b7c339 | 2619 | static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp, |
1da177e4 LT |
2620 | int *valp, |
2621 | int write, void *data) | |
2622 | { | |
2623 | if (write) { | |
2624 | *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp); | |
2625 | } else { | |
2626 | int val = *valp; | |
2627 | unsigned long lval; | |
2628 | if (val < 0) { | |
00b7c339 | 2629 | *negp = true; |
1da177e4 LT |
2630 | lval = (unsigned long)-val; |
2631 | } else { | |
00b7c339 | 2632 | *negp = false; |
1da177e4 LT |
2633 | lval = (unsigned long)val; |
2634 | } | |
2635 | *lvalp = jiffies_to_msecs(lval); | |
2636 | } | |
2637 | return 0; | |
2638 | } | |
2639 | ||
2640 | /** | |
2641 | * proc_dointvec_jiffies - read a vector of integers as seconds | |
2642 | * @table: the sysctl table | |
2643 | * @write: %TRUE if this is a write to the sysctl file | |
1da177e4 LT |
2644 | * @buffer: the user buffer |
2645 | * @lenp: the size of the user buffer | |
2646 | * @ppos: file position | |
2647 | * | |
2648 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer | |
2649 | * values from/to the user buffer, treated as an ASCII string. | |
2650 | * The values read are assumed to be in seconds, and are converted into | |
2651 | * jiffies. | |
2652 | * | |
2653 | * Returns 0 on success. | |
2654 | */ | |
8d65af78 | 2655 | int proc_dointvec_jiffies(struct ctl_table *table, int write, |
1da177e4 LT |
2656 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2657 | { | |
8d65af78 | 2658 | return do_proc_dointvec(table,write,buffer,lenp,ppos, |
1da177e4 LT |
2659 | do_proc_dointvec_jiffies_conv,NULL); |
2660 | } | |
2661 | ||
2662 | /** | |
2663 | * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds | |
2664 | * @table: the sysctl table | |
2665 | * @write: %TRUE if this is a write to the sysctl file | |
1da177e4 LT |
2666 | * @buffer: the user buffer |
2667 | * @lenp: the size of the user buffer | |
1e5d5331 | 2668 | * @ppos: pointer to the file position |
1da177e4 LT |
2669 | * |
2670 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer | |
2671 | * values from/to the user buffer, treated as an ASCII string. | |
2672 | * The values read are assumed to be in 1/USER_HZ seconds, and | |
2673 | * are converted into jiffies. | |
2674 | * | |
2675 | * Returns 0 on success. | |
2676 | */ | |
8d65af78 | 2677 | int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, |
1da177e4 LT |
2678 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2679 | { | |
8d65af78 | 2680 | return do_proc_dointvec(table,write,buffer,lenp,ppos, |
1da177e4 LT |
2681 | do_proc_dointvec_userhz_jiffies_conv,NULL); |
2682 | } | |
2683 | ||
2684 | /** | |
2685 | * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds | |
2686 | * @table: the sysctl table | |
2687 | * @write: %TRUE if this is a write to the sysctl file | |
1da177e4 LT |
2688 | * @buffer: the user buffer |
2689 | * @lenp: the size of the user buffer | |
67be2dd1 MW |
2690 | * @ppos: file position |
2691 | * @ppos: the current position in the file | |
1da177e4 LT |
2692 | * |
2693 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer | |
2694 | * values from/to the user buffer, treated as an ASCII string. | |
2695 | * The values read are assumed to be in 1/1000 seconds, and | |
2696 | * are converted into jiffies. | |
2697 | * | |
2698 | * Returns 0 on success. | |
2699 | */ | |
8d65af78 | 2700 | int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, |
1da177e4 LT |
2701 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2702 | { | |
8d65af78 | 2703 | return do_proc_dointvec(table, write, buffer, lenp, ppos, |
1da177e4 LT |
2704 | do_proc_dointvec_ms_jiffies_conv, NULL); |
2705 | } | |
2706 | ||
8d65af78 | 2707 | static int proc_do_cad_pid(struct ctl_table *table, int write, |
9ec52099 CLG |
2708 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2709 | { | |
2710 | struct pid *new_pid; | |
2711 | pid_t tmp; | |
2712 | int r; | |
2713 | ||
6c5f3e7b | 2714 | tmp = pid_vnr(cad_pid); |
9ec52099 | 2715 | |
8d65af78 | 2716 | r = __do_proc_dointvec(&tmp, table, write, buffer, |
9ec52099 CLG |
2717 | lenp, ppos, NULL, NULL); |
2718 | if (r || !write) | |
2719 | return r; | |
2720 | ||
2721 | new_pid = find_get_pid(tmp); | |
2722 | if (!new_pid) | |
2723 | return -ESRCH; | |
2724 | ||
2725 | put_pid(xchg(&cad_pid, new_pid)); | |
2726 | return 0; | |
2727 | } | |
2728 | ||
9f977fb7 OP |
2729 | /** |
2730 | * proc_do_large_bitmap - read/write from/to a large bitmap | |
2731 | * @table: the sysctl table | |
2732 | * @write: %TRUE if this is a write to the sysctl file | |
2733 | * @buffer: the user buffer | |
2734 | * @lenp: the size of the user buffer | |
2735 | * @ppos: file position | |
2736 | * | |
2737 | * The bitmap is stored at table->data and the bitmap length (in bits) | |
2738 | * in table->maxlen. | |
2739 | * | |
2740 | * We use a range comma separated format (e.g. 1,3-4,10-10) so that | |
2741 | * large bitmaps may be represented in a compact manner. Writing into | |
2742 | * the file will clear the bitmap then update it with the given input. | |
2743 | * | |
2744 | * Returns 0 on success. | |
2745 | */ | |
2746 | int proc_do_large_bitmap(struct ctl_table *table, int write, | |
2747 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2748 | { | |
2749 | int err = 0; | |
2750 | bool first = 1; | |
2751 | size_t left = *lenp; | |
2752 | unsigned long bitmap_len = table->maxlen; | |
2753 | unsigned long *bitmap = (unsigned long *) table->data; | |
2754 | unsigned long *tmp_bitmap = NULL; | |
2755 | char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c; | |
2756 | ||
2757 | if (!bitmap_len || !left || (*ppos && !write)) { | |
2758 | *lenp = 0; | |
2759 | return 0; | |
2760 | } | |
2761 | ||
2762 | if (write) { | |
2763 | unsigned long page = 0; | |
2764 | char *kbuf; | |
2765 | ||
2766 | if (left > PAGE_SIZE - 1) | |
2767 | left = PAGE_SIZE - 1; | |
2768 | ||
2769 | page = __get_free_page(GFP_TEMPORARY); | |
2770 | kbuf = (char *) page; | |
2771 | if (!kbuf) | |
2772 | return -ENOMEM; | |
2773 | if (copy_from_user(kbuf, buffer, left)) { | |
2774 | free_page(page); | |
2775 | return -EFAULT; | |
2776 | } | |
2777 | kbuf[left] = 0; | |
2778 | ||
2779 | tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long), | |
2780 | GFP_KERNEL); | |
2781 | if (!tmp_bitmap) { | |
2782 | free_page(page); | |
2783 | return -ENOMEM; | |
2784 | } | |
2785 | proc_skip_char(&kbuf, &left, '\n'); | |
2786 | while (!err && left) { | |
2787 | unsigned long val_a, val_b; | |
2788 | bool neg; | |
2789 | ||
2790 | err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a, | |
2791 | sizeof(tr_a), &c); | |
2792 | if (err) | |
2793 | break; | |
2794 | if (val_a >= bitmap_len || neg) { | |
2795 | err = -EINVAL; | |
2796 | break; | |
2797 | } | |
2798 | ||
2799 | val_b = val_a; | |
2800 | if (left) { | |
2801 | kbuf++; | |
2802 | left--; | |
2803 | } | |
2804 | ||
2805 | if (c == '-') { | |
2806 | err = proc_get_long(&kbuf, &left, &val_b, | |
2807 | &neg, tr_b, sizeof(tr_b), | |
2808 | &c); | |
2809 | if (err) | |
2810 | break; | |
2811 | if (val_b >= bitmap_len || neg || | |
2812 | val_a > val_b) { | |
2813 | err = -EINVAL; | |
2814 | break; | |
2815 | } | |
2816 | if (left) { | |
2817 | kbuf++; | |
2818 | left--; | |
2819 | } | |
2820 | } | |
2821 | ||
2822 | while (val_a <= val_b) | |
2823 | set_bit(val_a++, tmp_bitmap); | |
2824 | ||
2825 | first = 0; | |
2826 | proc_skip_char(&kbuf, &left, '\n'); | |
2827 | } | |
2828 | free_page(page); | |
2829 | } else { | |
2830 | unsigned long bit_a, bit_b = 0; | |
2831 | ||
2832 | while (left) { | |
2833 | bit_a = find_next_bit(bitmap, bitmap_len, bit_b); | |
2834 | if (bit_a >= bitmap_len) | |
2835 | break; | |
2836 | bit_b = find_next_zero_bit(bitmap, bitmap_len, | |
2837 | bit_a + 1) - 1; | |
2838 | ||
2839 | if (!first) { | |
2840 | err = proc_put_char(&buffer, &left, ','); | |
2841 | if (err) | |
2842 | break; | |
2843 | } | |
2844 | err = proc_put_long(&buffer, &left, bit_a, false); | |
2845 | if (err) | |
2846 | break; | |
2847 | if (bit_a != bit_b) { | |
2848 | err = proc_put_char(&buffer, &left, '-'); | |
2849 | if (err) | |
2850 | break; | |
2851 | err = proc_put_long(&buffer, &left, bit_b, false); | |
2852 | if (err) | |
2853 | break; | |
2854 | } | |
2855 | ||
2856 | first = 0; bit_b++; | |
2857 | } | |
2858 | if (!err) | |
2859 | err = proc_put_char(&buffer, &left, '\n'); | |
2860 | } | |
2861 | ||
2862 | if (!err) { | |
2863 | if (write) { | |
2864 | if (*ppos) | |
2865 | bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len); | |
2866 | else | |
2867 | memcpy(bitmap, tmp_bitmap, | |
2868 | BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long)); | |
2869 | } | |
2870 | kfree(tmp_bitmap); | |
2871 | *lenp -= left; | |
2872 | *ppos += *lenp; | |
2873 | return 0; | |
2874 | } else { | |
2875 | kfree(tmp_bitmap); | |
2876 | return err; | |
2877 | } | |
2878 | } | |
2879 | ||
1da177e4 LT |
2880 | #else /* CONFIG_PROC_FS */ |
2881 | ||
8d65af78 | 2882 | int proc_dostring(struct ctl_table *table, int write, |
1da177e4 LT |
2883 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2884 | { | |
2885 | return -ENOSYS; | |
2886 | } | |
2887 | ||
8d65af78 | 2888 | int proc_dointvec(struct ctl_table *table, int write, |
1da177e4 | 2889 | void __user *buffer, size_t *lenp, loff_t *ppos) |
1da177e4 LT |
2890 | { |
2891 | return -ENOSYS; | |
2892 | } | |
2893 | ||
8d65af78 | 2894 | int proc_dointvec_minmax(struct ctl_table *table, int write, |
1da177e4 LT |
2895 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2896 | { | |
2897 | return -ENOSYS; | |
2898 | } | |
2899 | ||
8d65af78 | 2900 | int proc_dointvec_jiffies(struct ctl_table *table, int write, |
1da177e4 LT |
2901 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2902 | { | |
2903 | return -ENOSYS; | |
2904 | } | |
2905 | ||
8d65af78 | 2906 | int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, |
1da177e4 LT |
2907 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2908 | { | |
2909 | return -ENOSYS; | |
2910 | } | |
2911 | ||
8d65af78 | 2912 | int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, |
1da177e4 LT |
2913 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2914 | { | |
2915 | return -ENOSYS; | |
2916 | } | |
2917 | ||
8d65af78 | 2918 | int proc_doulongvec_minmax(struct ctl_table *table, int write, |
1da177e4 LT |
2919 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2920 | { | |
2921 | return -ENOSYS; | |
2922 | } | |
2923 | ||
d8217f07 | 2924 | int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, |
1da177e4 LT |
2925 | void __user *buffer, |
2926 | size_t *lenp, loff_t *ppos) | |
2927 | { | |
2928 | return -ENOSYS; | |
2929 | } | |
2930 | ||
2931 | ||
2932 | #endif /* CONFIG_PROC_FS */ | |
2933 | ||
1da177e4 LT |
2934 | /* |
2935 | * No sense putting this after each symbol definition, twice, | |
2936 | * exception granted :-) | |
2937 | */ | |
2938 | EXPORT_SYMBOL(proc_dointvec); | |
2939 | EXPORT_SYMBOL(proc_dointvec_jiffies); | |
2940 | EXPORT_SYMBOL(proc_dointvec_minmax); | |
2941 | EXPORT_SYMBOL(proc_dointvec_userhz_jiffies); | |
2942 | EXPORT_SYMBOL(proc_dointvec_ms_jiffies); | |
2943 | EXPORT_SYMBOL(proc_dostring); | |
2944 | EXPORT_SYMBOL(proc_doulongvec_minmax); | |
2945 | EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax); | |
2946 | EXPORT_SYMBOL(register_sysctl_table); | |
29e796fd | 2947 | EXPORT_SYMBOL(register_sysctl_paths); |
1da177e4 | 2948 | EXPORT_SYMBOL(unregister_sysctl_table); |