Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * sysctl.c: General linux system control interface | |
3 | * | |
4 | * Begun 24 March 1995, Stephen Tweedie | |
5 | * Added /proc support, Dec 1995 | |
6 | * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas. | |
7 | * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver. | |
8 | * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver. | |
9 | * Dynamic registration fixes, Stephen Tweedie. | |
10 | * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn. | |
11 | * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris | |
12 | * Horn. | |
13 | * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer. | |
14 | * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer. | |
15 | * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill | |
16 | * Wendling. | |
17 | * The list_for_each() macro wasn't appropriate for the sysctl loop. | |
18 | * Removed it and replaced it with older style, 03/23/00, Bill Wendling | |
19 | */ | |
20 | ||
1da177e4 LT |
21 | #include <linux/module.h> |
22 | #include <linux/mm.h> | |
23 | #include <linux/swap.h> | |
24 | #include <linux/slab.h> | |
25 | #include <linux/sysctl.h> | |
d33ed52d | 26 | #include <linux/signal.h> |
1da177e4 | 27 | #include <linux/proc_fs.h> |
72c2d582 | 28 | #include <linux/security.h> |
1da177e4 | 29 | #include <linux/ctype.h> |
dfec072e | 30 | #include <linux/kmemcheck.h> |
62239ac2 | 31 | #include <linux/fs.h> |
1da177e4 LT |
32 | #include <linux/init.h> |
33 | #include <linux/kernel.h> | |
0296b228 | 34 | #include <linux/kobject.h> |
20380731 | 35 | #include <linux/net.h> |
1da177e4 LT |
36 | #include <linux/sysrq.h> |
37 | #include <linux/highuid.h> | |
38 | #include <linux/writeback.h> | |
3fff4c42 | 39 | #include <linux/ratelimit.h> |
1da177e4 | 40 | #include <linux/hugetlb.h> |
1da177e4 | 41 | #include <linux/initrd.h> |
0b77f5bf | 42 | #include <linux/key.h> |
1da177e4 LT |
43 | #include <linux/times.h> |
44 | #include <linux/limits.h> | |
45 | #include <linux/dcache.h> | |
46 | #include <linux/syscalls.h> | |
c748e134 | 47 | #include <linux/vmstat.h> |
c255d844 PM |
48 | #include <linux/nfs_fs.h> |
49 | #include <linux/acpi.h> | |
10a0a8d4 | 50 | #include <linux/reboot.h> |
b0fc494f | 51 | #include <linux/ftrace.h> |
12e22c5e | 52 | #include <linux/slow-work.h> |
cdd6c482 | 53 | #include <linux/perf_event.h> |
b2be84df | 54 | #include <linux/kprobes.h> |
1da177e4 LT |
55 | |
56 | #include <asm/uaccess.h> | |
57 | #include <asm/processor.h> | |
58 | ||
29cbc78b AK |
59 | #ifdef CONFIG_X86 |
60 | #include <asm/nmi.h> | |
0741f4d2 | 61 | #include <asm/stacktrace.h> |
6e7c4025 | 62 | #include <asm/io.h> |
29cbc78b | 63 | #endif |
c55b7c3e DY |
64 | #ifdef CONFIG_BSD_PROCESS_ACCT |
65 | #include <linux/acct.h> | |
66 | #endif | |
4f0e056f DY |
67 | #ifdef CONFIG_RT_MUTEXES |
68 | #include <linux/rtmutex.h> | |
69 | #endif | |
2edf5e49 DY |
70 | #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT) |
71 | #include <linux/lockdep.h> | |
72 | #endif | |
15485a46 DY |
73 | #ifdef CONFIG_CHR_DEV_SG |
74 | #include <scsi/sg.h> | |
75 | #endif | |
29cbc78b | 76 | |
7058cb02 | 77 | |
1da177e4 LT |
78 | #if defined(CONFIG_SYSCTL) |
79 | ||
80 | /* External variables not in a header file. */ | |
1da177e4 LT |
81 | extern int sysctl_overcommit_memory; |
82 | extern int sysctl_overcommit_ratio; | |
fadd8fbd | 83 | extern int sysctl_panic_on_oom; |
fe071d7e | 84 | extern int sysctl_oom_kill_allocating_task; |
fef1bdd6 | 85 | extern int sysctl_oom_dump_tasks; |
1da177e4 | 86 | extern int max_threads; |
1da177e4 | 87 | extern int core_uses_pid; |
d6e71144 | 88 | extern int suid_dumpable; |
1da177e4 | 89 | extern char core_pattern[]; |
a293980c | 90 | extern unsigned int core_pipe_limit; |
1da177e4 LT |
91 | extern int pid_max; |
92 | extern int min_free_kbytes; | |
1da177e4 | 93 | extern int pid_max_min, pid_max_max; |
9d0243bc | 94 | extern int sysctl_drop_caches; |
8ad4b1fb | 95 | extern int percpu_pagelist_fraction; |
bebfa101 | 96 | extern int compat_log; |
9745512c | 97 | extern int latencytop_enabled; |
eceea0b3 | 98 | extern int sysctl_nr_open_min, sysctl_nr_open_max; |
dd8632a1 PM |
99 | #ifndef CONFIG_MMU |
100 | extern int sysctl_nr_trim_pages; | |
101 | #endif | |
cb684b5b | 102 | #ifdef CONFIG_BLOCK |
5e605b64 | 103 | extern int blk_iopoll_enabled; |
cb684b5b | 104 | #endif |
1da177e4 | 105 | |
c4f3b63f | 106 | /* Constants used for minimum and maximum */ |
195cf453 | 107 | #ifdef CONFIG_DETECT_SOFTLOCKUP |
c4f3b63f | 108 | static int sixty = 60; |
9383d967 | 109 | static int neg_one = -1; |
c4f3b63f RT |
110 | #endif |
111 | ||
c4f3b63f | 112 | static int zero; |
cd5f9a4c LT |
113 | static int __maybe_unused one = 1; |
114 | static int __maybe_unused two = 2; | |
fc3501d4 | 115 | static unsigned long one_ul = 1; |
c4f3b63f | 116 | static int one_hundred = 100; |
af91322e DY |
117 | #ifdef CONFIG_PRINTK |
118 | static int ten_thousand = 10000; | |
119 | #endif | |
c4f3b63f | 120 | |
9e4a5bda AR |
121 | /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */ |
122 | static unsigned long dirty_bytes_min = 2 * PAGE_SIZE; | |
123 | ||
1da177e4 LT |
124 | /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */ |
125 | static int maxolduid = 65535; | |
126 | static int minolduid; | |
8ad4b1fb | 127 | static int min_percpu_pagelist_fract = 8; |
1da177e4 LT |
128 | |
129 | static int ngroups_max = NGROUPS_MAX; | |
130 | ||
72c57ed5 | 131 | #ifdef CONFIG_SPARC |
17f04fbb | 132 | #include <asm/system.h> |
1da177e4 LT |
133 | #endif |
134 | ||
0871420f DM |
135 | #ifdef CONFIG_SPARC64 |
136 | extern int sysctl_tsb_ratio; | |
137 | #endif | |
138 | ||
1da177e4 LT |
139 | #ifdef __hppa__ |
140 | extern int pwrsw_enabled; | |
141 | extern int unaligned_enabled; | |
142 | #endif | |
143 | ||
347a8dc3 | 144 | #ifdef CONFIG_S390 |
1da177e4 LT |
145 | #ifdef CONFIG_MATHEMU |
146 | extern int sysctl_ieee_emulation_warnings; | |
147 | #endif | |
148 | extern int sysctl_userprocess_debug; | |
951f22d5 | 149 | extern int spin_retry; |
1da177e4 LT |
150 | #endif |
151 | ||
d2b176ed JS |
152 | #ifdef CONFIG_IA64 |
153 | extern int no_unaligned_warning; | |
88fc241f | 154 | extern int unaligned_dump_stack; |
d2b176ed JS |
155 | #endif |
156 | ||
3fff4c42 IM |
157 | extern struct ratelimit_state printk_ratelimit_state; |
158 | ||
d6f8ff73 | 159 | #ifdef CONFIG_PROC_SYSCTL |
8d65af78 | 160 | static int proc_do_cad_pid(struct ctl_table *table, int write, |
9ec52099 | 161 | void __user *buffer, size_t *lenp, loff_t *ppos); |
8d65af78 | 162 | static int proc_taint(struct ctl_table *table, int write, |
34f5a398 | 163 | void __user *buffer, size_t *lenp, loff_t *ppos); |
d6f8ff73 | 164 | #endif |
9ec52099 | 165 | |
97f5f0cd DT |
166 | #ifdef CONFIG_MAGIC_SYSRQ |
167 | static int __sysrq_enabled; /* Note: sysrq code ises it's own private copy */ | |
168 | ||
169 | static int sysrq_sysctl_handler(ctl_table *table, int write, | |
170 | void __user *buffer, size_t *lenp, | |
171 | loff_t *ppos) | |
172 | { | |
173 | int error; | |
174 | ||
175 | error = proc_dointvec(table, write, buffer, lenp, ppos); | |
176 | if (error) | |
177 | return error; | |
178 | ||
179 | if (write) | |
180 | sysrq_toggle_support(__sysrq_enabled); | |
181 | ||
182 | return 0; | |
183 | } | |
184 | ||
185 | #endif | |
186 | ||
d8217f07 | 187 | static struct ctl_table root_table[]; |
e51b6ba0 EB |
188 | static struct ctl_table_root sysctl_table_root; |
189 | static struct ctl_table_header root_table_header = { | |
b380b0d4 | 190 | .count = 1, |
e51b6ba0 | 191 | .ctl_table = root_table, |
73455092 | 192 | .ctl_entry = LIST_HEAD_INIT(sysctl_table_root.default_set.list), |
e51b6ba0 | 193 | .root = &sysctl_table_root, |
73455092 | 194 | .set = &sysctl_table_root.default_set, |
e51b6ba0 EB |
195 | }; |
196 | static struct ctl_table_root sysctl_table_root = { | |
197 | .root_list = LIST_HEAD_INIT(sysctl_table_root.root_list), | |
73455092 | 198 | .default_set.list = LIST_HEAD_INIT(root_table_header.ctl_entry), |
e51b6ba0 | 199 | }; |
1da177e4 | 200 | |
d8217f07 EB |
201 | static struct ctl_table kern_table[]; |
202 | static struct ctl_table vm_table[]; | |
203 | static struct ctl_table fs_table[]; | |
204 | static struct ctl_table debug_table[]; | |
205 | static struct ctl_table dev_table[]; | |
206 | extern struct ctl_table random_table[]; | |
2d9048e2 | 207 | #ifdef CONFIG_INOTIFY_USER |
d8217f07 | 208 | extern struct ctl_table inotify_table[]; |
0399cb08 | 209 | #endif |
7ef9964e DL |
210 | #ifdef CONFIG_EPOLL |
211 | extern struct ctl_table epoll_table[]; | |
212 | #endif | |
1da177e4 LT |
213 | |
214 | #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT | |
215 | int sysctl_legacy_va_layout; | |
216 | #endif | |
217 | ||
1da177e4 LT |
218 | /* The default sysctl tables: */ |
219 | ||
d8217f07 | 220 | static struct ctl_table root_table[] = { |
1da177e4 | 221 | { |
1da177e4 LT |
222 | .procname = "kernel", |
223 | .mode = 0555, | |
224 | .child = kern_table, | |
225 | }, | |
226 | { | |
1da177e4 LT |
227 | .procname = "vm", |
228 | .mode = 0555, | |
229 | .child = vm_table, | |
230 | }, | |
1da177e4 | 231 | { |
1da177e4 LT |
232 | .procname = "fs", |
233 | .mode = 0555, | |
234 | .child = fs_table, | |
235 | }, | |
236 | { | |
1da177e4 LT |
237 | .procname = "debug", |
238 | .mode = 0555, | |
239 | .child = debug_table, | |
240 | }, | |
241 | { | |
1da177e4 LT |
242 | .procname = "dev", |
243 | .mode = 0555, | |
244 | .child = dev_table, | |
245 | }, | |
2be7fe07 AM |
246 | /* |
247 | * NOTE: do not add new entries to this table unless you have read | |
248 | * Documentation/sysctl/ctl_unnumbered.txt | |
249 | */ | |
6fce56ec | 250 | { } |
1da177e4 LT |
251 | }; |
252 | ||
77e54a1f | 253 | #ifdef CONFIG_SCHED_DEBUG |
73c4efd2 ED |
254 | static int min_sched_granularity_ns = 100000; /* 100 usecs */ |
255 | static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */ | |
256 | static int min_wakeup_granularity_ns; /* 0 usecs */ | |
257 | static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */ | |
1983a922 CE |
258 | static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE; |
259 | static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1; | |
acb4a848 CE |
260 | static int min_sched_shares_ratelimit = 100000; /* 100 usec */ |
261 | static int max_sched_shares_ratelimit = NSEC_PER_SEC; /* 1 second */ | |
77e54a1f IM |
262 | #endif |
263 | ||
d8217f07 | 264 | static struct ctl_table kern_table[] = { |
2bba22c5 | 265 | { |
2bba22c5 MG |
266 | .procname = "sched_child_runs_first", |
267 | .data = &sysctl_sched_child_runs_first, | |
268 | .maxlen = sizeof(unsigned int), | |
269 | .mode = 0644, | |
6d456111 | 270 | .proc_handler = proc_dointvec, |
2bba22c5 | 271 | }, |
77e54a1f IM |
272 | #ifdef CONFIG_SCHED_DEBUG |
273 | { | |
b2be5e96 PZ |
274 | .procname = "sched_min_granularity_ns", |
275 | .data = &sysctl_sched_min_granularity, | |
77e54a1f IM |
276 | .maxlen = sizeof(unsigned int), |
277 | .mode = 0644, | |
702a7c76 | 278 | .proc_handler = sched_proc_update_handler, |
b2be5e96 PZ |
279 | .extra1 = &min_sched_granularity_ns, |
280 | .extra2 = &max_sched_granularity_ns, | |
77e54a1f | 281 | }, |
21805085 | 282 | { |
21805085 PZ |
283 | .procname = "sched_latency_ns", |
284 | .data = &sysctl_sched_latency, | |
285 | .maxlen = sizeof(unsigned int), | |
286 | .mode = 0644, | |
702a7c76 | 287 | .proc_handler = sched_proc_update_handler, |
21805085 PZ |
288 | .extra1 = &min_sched_granularity_ns, |
289 | .extra2 = &max_sched_granularity_ns, | |
290 | }, | |
77e54a1f | 291 | { |
77e54a1f IM |
292 | .procname = "sched_wakeup_granularity_ns", |
293 | .data = &sysctl_sched_wakeup_granularity, | |
294 | .maxlen = sizeof(unsigned int), | |
295 | .mode = 0644, | |
702a7c76 | 296 | .proc_handler = sched_proc_update_handler, |
77e54a1f IM |
297 | .extra1 = &min_wakeup_granularity_ns, |
298 | .extra2 = &max_wakeup_granularity_ns, | |
299 | }, | |
2398f2c6 | 300 | { |
2398f2c6 PZ |
301 | .procname = "sched_shares_ratelimit", |
302 | .data = &sysctl_sched_shares_ratelimit, | |
303 | .maxlen = sizeof(unsigned int), | |
304 | .mode = 0644, | |
702a7c76 | 305 | .proc_handler = sched_proc_update_handler, |
acb4a848 CE |
306 | .extra1 = &min_sched_shares_ratelimit, |
307 | .extra2 = &max_sched_shares_ratelimit, | |
2398f2c6 | 308 | }, |
1983a922 | 309 | { |
1983a922 CE |
310 | .procname = "sched_tunable_scaling", |
311 | .data = &sysctl_sched_tunable_scaling, | |
312 | .maxlen = sizeof(enum sched_tunable_scaling), | |
313 | .mode = 0644, | |
702a7c76 | 314 | .proc_handler = sched_proc_update_handler, |
1983a922 CE |
315 | .extra1 = &min_sched_tunable_scaling, |
316 | .extra2 = &max_sched_tunable_scaling, | |
2398f2c6 | 317 | }, |
ffda12a1 | 318 | { |
ffda12a1 PZ |
319 | .procname = "sched_shares_thresh", |
320 | .data = &sysctl_sched_shares_thresh, | |
321 | .maxlen = sizeof(unsigned int), | |
322 | .mode = 0644, | |
6d456111 | 323 | .proc_handler = proc_dointvec_minmax, |
ffda12a1 PZ |
324 | .extra1 = &zero, |
325 | }, | |
da84d961 | 326 | { |
da84d961 IM |
327 | .procname = "sched_migration_cost", |
328 | .data = &sysctl_sched_migration_cost, | |
329 | .maxlen = sizeof(unsigned int), | |
330 | .mode = 0644, | |
6d456111 | 331 | .proc_handler = proc_dointvec, |
da84d961 | 332 | }, |
b82d9fdd | 333 | { |
b82d9fdd PZ |
334 | .procname = "sched_nr_migrate", |
335 | .data = &sysctl_sched_nr_migrate, | |
336 | .maxlen = sizeof(unsigned int), | |
fa85ae24 | 337 | .mode = 0644, |
6d456111 | 338 | .proc_handler = proc_dointvec, |
fa85ae24 | 339 | }, |
e9e9250b | 340 | { |
e9e9250b PZ |
341 | .procname = "sched_time_avg", |
342 | .data = &sysctl_sched_time_avg, | |
343 | .maxlen = sizeof(unsigned int), | |
344 | .mode = 0644, | |
6d456111 | 345 | .proc_handler = proc_dointvec, |
e9e9250b | 346 | }, |
cd1bb94b | 347 | { |
cd1bb94b AB |
348 | .procname = "timer_migration", |
349 | .data = &sysctl_timer_migration, | |
350 | .maxlen = sizeof(unsigned int), | |
351 | .mode = 0644, | |
6d456111 | 352 | .proc_handler = proc_dointvec_minmax, |
bfdb4d9f AB |
353 | .extra1 = &zero, |
354 | .extra2 = &one, | |
fa85ae24 | 355 | }, |
1fc84aaa | 356 | #endif |
9f0c1e56 | 357 | { |
9f0c1e56 PZ |
358 | .procname = "sched_rt_period_us", |
359 | .data = &sysctl_sched_rt_period, | |
360 | .maxlen = sizeof(unsigned int), | |
361 | .mode = 0644, | |
6d456111 | 362 | .proc_handler = sched_rt_handler, |
9f0c1e56 PZ |
363 | }, |
364 | { | |
9f0c1e56 PZ |
365 | .procname = "sched_rt_runtime_us", |
366 | .data = &sysctl_sched_rt_runtime, | |
367 | .maxlen = sizeof(int), | |
368 | .mode = 0644, | |
6d456111 | 369 | .proc_handler = sched_rt_handler, |
9f0c1e56 | 370 | }, |
1799e35d | 371 | { |
1799e35d IM |
372 | .procname = "sched_compat_yield", |
373 | .data = &sysctl_sched_compat_yield, | |
374 | .maxlen = sizeof(unsigned int), | |
375 | .mode = 0644, | |
6d456111 | 376 | .proc_handler = proc_dointvec, |
1799e35d | 377 | }, |
f20786ff PZ |
378 | #ifdef CONFIG_PROVE_LOCKING |
379 | { | |
f20786ff PZ |
380 | .procname = "prove_locking", |
381 | .data = &prove_locking, | |
382 | .maxlen = sizeof(int), | |
383 | .mode = 0644, | |
6d456111 | 384 | .proc_handler = proc_dointvec, |
f20786ff PZ |
385 | }, |
386 | #endif | |
387 | #ifdef CONFIG_LOCK_STAT | |
388 | { | |
f20786ff PZ |
389 | .procname = "lock_stat", |
390 | .data = &lock_stat, | |
391 | .maxlen = sizeof(int), | |
392 | .mode = 0644, | |
6d456111 | 393 | .proc_handler = proc_dointvec, |
f20786ff | 394 | }, |
77e54a1f | 395 | #endif |
1da177e4 | 396 | { |
1da177e4 LT |
397 | .procname = "panic", |
398 | .data = &panic_timeout, | |
399 | .maxlen = sizeof(int), | |
400 | .mode = 0644, | |
6d456111 | 401 | .proc_handler = proc_dointvec, |
1da177e4 LT |
402 | }, |
403 | { | |
1da177e4 LT |
404 | .procname = "core_uses_pid", |
405 | .data = &core_uses_pid, | |
406 | .maxlen = sizeof(int), | |
407 | .mode = 0644, | |
6d456111 | 408 | .proc_handler = proc_dointvec, |
1da177e4 LT |
409 | }, |
410 | { | |
1da177e4 LT |
411 | .procname = "core_pattern", |
412 | .data = core_pattern, | |
71ce92f3 | 413 | .maxlen = CORENAME_MAX_SIZE, |
1da177e4 | 414 | .mode = 0644, |
6d456111 | 415 | .proc_handler = proc_dostring, |
1da177e4 | 416 | }, |
a293980c | 417 | { |
a293980c NH |
418 | .procname = "core_pipe_limit", |
419 | .data = &core_pipe_limit, | |
420 | .maxlen = sizeof(unsigned int), | |
421 | .mode = 0644, | |
6d456111 | 422 | .proc_handler = proc_dointvec, |
a293980c | 423 | }, |
34f5a398 | 424 | #ifdef CONFIG_PROC_SYSCTL |
1da177e4 | 425 | { |
1da177e4 | 426 | .procname = "tainted", |
25ddbb18 | 427 | .maxlen = sizeof(long), |
34f5a398 | 428 | .mode = 0644, |
6d456111 | 429 | .proc_handler = proc_taint, |
1da177e4 | 430 | }, |
34f5a398 | 431 | #endif |
9745512c AV |
432 | #ifdef CONFIG_LATENCYTOP |
433 | { | |
434 | .procname = "latencytop", | |
435 | .data = &latencytop_enabled, | |
436 | .maxlen = sizeof(int), | |
437 | .mode = 0644, | |
6d456111 | 438 | .proc_handler = proc_dointvec, |
9745512c AV |
439 | }, |
440 | #endif | |
1da177e4 LT |
441 | #ifdef CONFIG_BLK_DEV_INITRD |
442 | { | |
1da177e4 LT |
443 | .procname = "real-root-dev", |
444 | .data = &real_root_dev, | |
445 | .maxlen = sizeof(int), | |
446 | .mode = 0644, | |
6d456111 | 447 | .proc_handler = proc_dointvec, |
1da177e4 LT |
448 | }, |
449 | #endif | |
45807a1d | 450 | { |
45807a1d IM |
451 | .procname = "print-fatal-signals", |
452 | .data = &print_fatal_signals, | |
453 | .maxlen = sizeof(int), | |
454 | .mode = 0644, | |
6d456111 | 455 | .proc_handler = proc_dointvec, |
45807a1d | 456 | }, |
72c57ed5 | 457 | #ifdef CONFIG_SPARC |
1da177e4 | 458 | { |
1da177e4 LT |
459 | .procname = "reboot-cmd", |
460 | .data = reboot_command, | |
461 | .maxlen = 256, | |
462 | .mode = 0644, | |
6d456111 | 463 | .proc_handler = proc_dostring, |
1da177e4 LT |
464 | }, |
465 | { | |
1da177e4 LT |
466 | .procname = "stop-a", |
467 | .data = &stop_a_enabled, | |
468 | .maxlen = sizeof (int), | |
469 | .mode = 0644, | |
6d456111 | 470 | .proc_handler = proc_dointvec, |
1da177e4 LT |
471 | }, |
472 | { | |
1da177e4 LT |
473 | .procname = "scons-poweroff", |
474 | .data = &scons_pwroff, | |
475 | .maxlen = sizeof (int), | |
476 | .mode = 0644, | |
6d456111 | 477 | .proc_handler = proc_dointvec, |
1da177e4 LT |
478 | }, |
479 | #endif | |
0871420f DM |
480 | #ifdef CONFIG_SPARC64 |
481 | { | |
0871420f DM |
482 | .procname = "tsb-ratio", |
483 | .data = &sysctl_tsb_ratio, | |
484 | .maxlen = sizeof (int), | |
485 | .mode = 0644, | |
6d456111 | 486 | .proc_handler = proc_dointvec, |
0871420f DM |
487 | }, |
488 | #endif | |
1da177e4 LT |
489 | #ifdef __hppa__ |
490 | { | |
1da177e4 LT |
491 | .procname = "soft-power", |
492 | .data = &pwrsw_enabled, | |
493 | .maxlen = sizeof (int), | |
494 | .mode = 0644, | |
6d456111 | 495 | .proc_handler = proc_dointvec, |
1da177e4 LT |
496 | }, |
497 | { | |
1da177e4 LT |
498 | .procname = "unaligned-trap", |
499 | .data = &unaligned_enabled, | |
500 | .maxlen = sizeof (int), | |
501 | .mode = 0644, | |
6d456111 | 502 | .proc_handler = proc_dointvec, |
1da177e4 LT |
503 | }, |
504 | #endif | |
505 | { | |
1da177e4 LT |
506 | .procname = "ctrl-alt-del", |
507 | .data = &C_A_D, | |
508 | .maxlen = sizeof(int), | |
509 | .mode = 0644, | |
6d456111 | 510 | .proc_handler = proc_dointvec, |
1da177e4 | 511 | }, |
606576ce | 512 | #ifdef CONFIG_FUNCTION_TRACER |
b0fc494f | 513 | { |
b0fc494f SR |
514 | .procname = "ftrace_enabled", |
515 | .data = &ftrace_enabled, | |
516 | .maxlen = sizeof(int), | |
517 | .mode = 0644, | |
6d456111 | 518 | .proc_handler = ftrace_enable_sysctl, |
b0fc494f SR |
519 | }, |
520 | #endif | |
f38f1d2a SR |
521 | #ifdef CONFIG_STACK_TRACER |
522 | { | |
f38f1d2a SR |
523 | .procname = "stack_tracer_enabled", |
524 | .data = &stack_tracer_enabled, | |
525 | .maxlen = sizeof(int), | |
526 | .mode = 0644, | |
6d456111 | 527 | .proc_handler = stack_trace_sysctl, |
f38f1d2a SR |
528 | }, |
529 | #endif | |
944ac425 SR |
530 | #ifdef CONFIG_TRACING |
531 | { | |
3299b4dd | 532 | .procname = "ftrace_dump_on_oops", |
944ac425 SR |
533 | .data = &ftrace_dump_on_oops, |
534 | .maxlen = sizeof(int), | |
535 | .mode = 0644, | |
6d456111 | 536 | .proc_handler = proc_dointvec, |
944ac425 SR |
537 | }, |
538 | #endif | |
a1ef5adb | 539 | #ifdef CONFIG_MODULES |
1da177e4 | 540 | { |
1da177e4 LT |
541 | .procname = "modprobe", |
542 | .data = &modprobe_path, | |
543 | .maxlen = KMOD_PATH_LEN, | |
544 | .mode = 0644, | |
6d456111 | 545 | .proc_handler = proc_dostring, |
1da177e4 | 546 | }, |
3d43321b | 547 | { |
3d43321b KC |
548 | .procname = "modules_disabled", |
549 | .data = &modules_disabled, | |
550 | .maxlen = sizeof(int), | |
551 | .mode = 0644, | |
552 | /* only handle a transition from default "0" to "1" */ | |
6d456111 | 553 | .proc_handler = proc_dointvec_minmax, |
3d43321b KC |
554 | .extra1 = &one, |
555 | .extra2 = &one, | |
556 | }, | |
1da177e4 | 557 | #endif |
57ae2508 | 558 | #if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET) |
1da177e4 | 559 | { |
1da177e4 | 560 | .procname = "hotplug", |
312c004d KS |
561 | .data = &uevent_helper, |
562 | .maxlen = UEVENT_HELPER_PATH_LEN, | |
1da177e4 | 563 | .mode = 0644, |
6d456111 | 564 | .proc_handler = proc_dostring, |
1da177e4 LT |
565 | }, |
566 | #endif | |
567 | #ifdef CONFIG_CHR_DEV_SG | |
568 | { | |
1da177e4 LT |
569 | .procname = "sg-big-buff", |
570 | .data = &sg_big_buff, | |
571 | .maxlen = sizeof (int), | |
572 | .mode = 0444, | |
6d456111 | 573 | .proc_handler = proc_dointvec, |
1da177e4 LT |
574 | }, |
575 | #endif | |
576 | #ifdef CONFIG_BSD_PROCESS_ACCT | |
577 | { | |
1da177e4 LT |
578 | .procname = "acct", |
579 | .data = &acct_parm, | |
580 | .maxlen = 3*sizeof(int), | |
581 | .mode = 0644, | |
6d456111 | 582 | .proc_handler = proc_dointvec, |
1da177e4 LT |
583 | }, |
584 | #endif | |
1da177e4 LT |
585 | #ifdef CONFIG_MAGIC_SYSRQ |
586 | { | |
1da177e4 | 587 | .procname = "sysrq", |
5d6f647f | 588 | .data = &__sysrq_enabled, |
1da177e4 LT |
589 | .maxlen = sizeof (int), |
590 | .mode = 0644, | |
97f5f0cd | 591 | .proc_handler = sysrq_sysctl_handler, |
1da177e4 LT |
592 | }, |
593 | #endif | |
d6f8ff73 | 594 | #ifdef CONFIG_PROC_SYSCTL |
1da177e4 | 595 | { |
1da177e4 | 596 | .procname = "cad_pid", |
9ec52099 | 597 | .data = NULL, |
1da177e4 LT |
598 | .maxlen = sizeof (int), |
599 | .mode = 0600, | |
6d456111 | 600 | .proc_handler = proc_do_cad_pid, |
1da177e4 | 601 | }, |
d6f8ff73 | 602 | #endif |
1da177e4 | 603 | { |
1da177e4 LT |
604 | .procname = "threads-max", |
605 | .data = &max_threads, | |
606 | .maxlen = sizeof(int), | |
607 | .mode = 0644, | |
6d456111 | 608 | .proc_handler = proc_dointvec, |
1da177e4 LT |
609 | }, |
610 | { | |
1da177e4 LT |
611 | .procname = "random", |
612 | .mode = 0555, | |
613 | .child = random_table, | |
614 | }, | |
1da177e4 | 615 | { |
1da177e4 LT |
616 | .procname = "overflowuid", |
617 | .data = &overflowuid, | |
618 | .maxlen = sizeof(int), | |
619 | .mode = 0644, | |
6d456111 | 620 | .proc_handler = proc_dointvec_minmax, |
1da177e4 LT |
621 | .extra1 = &minolduid, |
622 | .extra2 = &maxolduid, | |
623 | }, | |
624 | { | |
1da177e4 LT |
625 | .procname = "overflowgid", |
626 | .data = &overflowgid, | |
627 | .maxlen = sizeof(int), | |
628 | .mode = 0644, | |
6d456111 | 629 | .proc_handler = proc_dointvec_minmax, |
1da177e4 LT |
630 | .extra1 = &minolduid, |
631 | .extra2 = &maxolduid, | |
632 | }, | |
347a8dc3 | 633 | #ifdef CONFIG_S390 |
1da177e4 LT |
634 | #ifdef CONFIG_MATHEMU |
635 | { | |
1da177e4 LT |
636 | .procname = "ieee_emulation_warnings", |
637 | .data = &sysctl_ieee_emulation_warnings, | |
638 | .maxlen = sizeof(int), | |
639 | .mode = 0644, | |
6d456111 | 640 | .proc_handler = proc_dointvec, |
1da177e4 | 641 | }, |
1da177e4 LT |
642 | #endif |
643 | { | |
1da177e4 | 644 | .procname = "userprocess_debug", |
ab3c68ee | 645 | .data = &show_unhandled_signals, |
1da177e4 LT |
646 | .maxlen = sizeof(int), |
647 | .mode = 0644, | |
6d456111 | 648 | .proc_handler = proc_dointvec, |
1da177e4 LT |
649 | }, |
650 | #endif | |
651 | { | |
1da177e4 LT |
652 | .procname = "pid_max", |
653 | .data = &pid_max, | |
654 | .maxlen = sizeof (int), | |
655 | .mode = 0644, | |
6d456111 | 656 | .proc_handler = proc_dointvec_minmax, |
1da177e4 LT |
657 | .extra1 = &pid_max_min, |
658 | .extra2 = &pid_max_max, | |
659 | }, | |
660 | { | |
1da177e4 LT |
661 | .procname = "panic_on_oops", |
662 | .data = &panic_on_oops, | |
663 | .maxlen = sizeof(int), | |
664 | .mode = 0644, | |
6d456111 | 665 | .proc_handler = proc_dointvec, |
1da177e4 | 666 | }, |
7ef3d2fd JP |
667 | #if defined CONFIG_PRINTK |
668 | { | |
7ef3d2fd JP |
669 | .procname = "printk", |
670 | .data = &console_loglevel, | |
671 | .maxlen = 4*sizeof(int), | |
672 | .mode = 0644, | |
6d456111 | 673 | .proc_handler = proc_dointvec, |
7ef3d2fd | 674 | }, |
1da177e4 | 675 | { |
1da177e4 | 676 | .procname = "printk_ratelimit", |
717115e1 | 677 | .data = &printk_ratelimit_state.interval, |
1da177e4 LT |
678 | .maxlen = sizeof(int), |
679 | .mode = 0644, | |
6d456111 | 680 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
681 | }, |
682 | { | |
1da177e4 | 683 | .procname = "printk_ratelimit_burst", |
717115e1 | 684 | .data = &printk_ratelimit_state.burst, |
1da177e4 LT |
685 | .maxlen = sizeof(int), |
686 | .mode = 0644, | |
6d456111 | 687 | .proc_handler = proc_dointvec, |
1da177e4 | 688 | }, |
af91322e | 689 | { |
af91322e DY |
690 | .procname = "printk_delay", |
691 | .data = &printk_delay_msec, | |
692 | .maxlen = sizeof(int), | |
693 | .mode = 0644, | |
6d456111 | 694 | .proc_handler = proc_dointvec_minmax, |
af91322e DY |
695 | .extra1 = &zero, |
696 | .extra2 = &ten_thousand, | |
697 | }, | |
7ef3d2fd | 698 | #endif |
1da177e4 | 699 | { |
1da177e4 LT |
700 | .procname = "ngroups_max", |
701 | .data = &ngroups_max, | |
702 | .maxlen = sizeof (int), | |
703 | .mode = 0444, | |
6d456111 | 704 | .proc_handler = proc_dointvec, |
1da177e4 LT |
705 | }, |
706 | #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86) | |
707 | { | |
1da177e4 LT |
708 | .procname = "unknown_nmi_panic", |
709 | .data = &unknown_nmi_panic, | |
710 | .maxlen = sizeof (int), | |
711 | .mode = 0644, | |
6d456111 | 712 | .proc_handler = proc_dointvec, |
1da177e4 | 713 | }, |
407984f1 | 714 | { |
407984f1 DZ |
715 | .procname = "nmi_watchdog", |
716 | .data = &nmi_watchdog_enabled, | |
717 | .maxlen = sizeof (int), | |
718 | .mode = 0644, | |
6d456111 | 719 | .proc_handler = proc_nmi_enabled, |
1da177e4 LT |
720 | }, |
721 | #endif | |
722 | #if defined(CONFIG_X86) | |
8da5adda | 723 | { |
8da5adda DZ |
724 | .procname = "panic_on_unrecovered_nmi", |
725 | .data = &panic_on_unrecovered_nmi, | |
726 | .maxlen = sizeof(int), | |
727 | .mode = 0644, | |
6d456111 | 728 | .proc_handler = proc_dointvec, |
8da5adda | 729 | }, |
5211a242 | 730 | { |
5211a242 KG |
731 | .procname = "panic_on_io_nmi", |
732 | .data = &panic_on_io_nmi, | |
733 | .maxlen = sizeof(int), | |
734 | .mode = 0644, | |
6d456111 | 735 | .proc_handler = proc_dointvec, |
5211a242 | 736 | }, |
1da177e4 | 737 | { |
1da177e4 LT |
738 | .procname = "bootloader_type", |
739 | .data = &bootloader_type, | |
740 | .maxlen = sizeof (int), | |
741 | .mode = 0444, | |
6d456111 | 742 | .proc_handler = proc_dointvec, |
1da177e4 | 743 | }, |
5031296c | 744 | { |
5031296c PA |
745 | .procname = "bootloader_version", |
746 | .data = &bootloader_version, | |
747 | .maxlen = sizeof (int), | |
748 | .mode = 0444, | |
6d456111 | 749 | .proc_handler = proc_dointvec, |
5031296c | 750 | }, |
0741f4d2 | 751 | { |
0741f4d2 CE |
752 | .procname = "kstack_depth_to_print", |
753 | .data = &kstack_depth_to_print, | |
754 | .maxlen = sizeof(int), | |
755 | .mode = 0644, | |
6d456111 | 756 | .proc_handler = proc_dointvec, |
0741f4d2 | 757 | }, |
6e7c4025 | 758 | { |
6e7c4025 IM |
759 | .procname = "io_delay_type", |
760 | .data = &io_delay_type, | |
761 | .maxlen = sizeof(int), | |
762 | .mode = 0644, | |
6d456111 | 763 | .proc_handler = proc_dointvec, |
6e7c4025 | 764 | }, |
1da177e4 | 765 | #endif |
7a9166e3 | 766 | #if defined(CONFIG_MMU) |
1da177e4 | 767 | { |
1da177e4 LT |
768 | .procname = "randomize_va_space", |
769 | .data = &randomize_va_space, | |
770 | .maxlen = sizeof(int), | |
771 | .mode = 0644, | |
6d456111 | 772 | .proc_handler = proc_dointvec, |
1da177e4 | 773 | }, |
7a9166e3 | 774 | #endif |
0152fb37 | 775 | #if defined(CONFIG_S390) && defined(CONFIG_SMP) |
951f22d5 | 776 | { |
951f22d5 MS |
777 | .procname = "spin_retry", |
778 | .data = &spin_retry, | |
779 | .maxlen = sizeof (int), | |
780 | .mode = 0644, | |
6d456111 | 781 | .proc_handler = proc_dointvec, |
951f22d5 | 782 | }, |
c255d844 | 783 | #endif |
673d5b43 | 784 | #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86) |
c255d844 | 785 | { |
c255d844 | 786 | .procname = "acpi_video_flags", |
77afcf78 | 787 | .data = &acpi_realmode_flags, |
c255d844 PM |
788 | .maxlen = sizeof (unsigned long), |
789 | .mode = 0644, | |
6d456111 | 790 | .proc_handler = proc_doulongvec_minmax, |
c255d844 | 791 | }, |
d2b176ed JS |
792 | #endif |
793 | #ifdef CONFIG_IA64 | |
794 | { | |
d2b176ed JS |
795 | .procname = "ignore-unaligned-usertrap", |
796 | .data = &no_unaligned_warning, | |
797 | .maxlen = sizeof (int), | |
798 | .mode = 0644, | |
6d456111 | 799 | .proc_handler = proc_dointvec, |
d2b176ed | 800 | }, |
88fc241f | 801 | { |
88fc241f DC |
802 | .procname = "unaligned-dump-stack", |
803 | .data = &unaligned_dump_stack, | |
804 | .maxlen = sizeof (int), | |
805 | .mode = 0644, | |
6d456111 | 806 | .proc_handler = proc_dointvec, |
88fc241f | 807 | }, |
bebfa101 | 808 | #endif |
c4f3b63f | 809 | #ifdef CONFIG_DETECT_SOFTLOCKUP |
9c44bc03 | 810 | { |
9c44bc03 IM |
811 | .procname = "softlockup_panic", |
812 | .data = &softlockup_panic, | |
813 | .maxlen = sizeof(int), | |
814 | .mode = 0644, | |
6d456111 | 815 | .proc_handler = proc_dointvec_minmax, |
9c44bc03 IM |
816 | .extra1 = &zero, |
817 | .extra2 = &one, | |
818 | }, | |
c4f3b63f | 819 | { |
c4f3b63f RT |
820 | .procname = "softlockup_thresh", |
821 | .data = &softlockup_thresh, | |
9383d967 | 822 | .maxlen = sizeof(int), |
c4f3b63f | 823 | .mode = 0644, |
6d456111 | 824 | .proc_handler = proc_dosoftlockup_thresh, |
9383d967 | 825 | .extra1 = &neg_one, |
c4f3b63f RT |
826 | .extra2 = &sixty, |
827 | }, | |
e162b39a MSB |
828 | #endif |
829 | #ifdef CONFIG_DETECT_HUNG_TASK | |
830 | { | |
e162b39a MSB |
831 | .procname = "hung_task_panic", |
832 | .data = &sysctl_hung_task_panic, | |
833 | .maxlen = sizeof(int), | |
834 | .mode = 0644, | |
6d456111 | 835 | .proc_handler = proc_dointvec_minmax, |
e162b39a MSB |
836 | .extra1 = &zero, |
837 | .extra2 = &one, | |
838 | }, | |
82a1fcb9 | 839 | { |
82a1fcb9 IM |
840 | .procname = "hung_task_check_count", |
841 | .data = &sysctl_hung_task_check_count, | |
90739081 | 842 | .maxlen = sizeof(unsigned long), |
82a1fcb9 | 843 | .mode = 0644, |
6d456111 | 844 | .proc_handler = proc_doulongvec_minmax, |
82a1fcb9 IM |
845 | }, |
846 | { | |
82a1fcb9 IM |
847 | .procname = "hung_task_timeout_secs", |
848 | .data = &sysctl_hung_task_timeout_secs, | |
90739081 | 849 | .maxlen = sizeof(unsigned long), |
82a1fcb9 | 850 | .mode = 0644, |
6d456111 | 851 | .proc_handler = proc_dohung_task_timeout_secs, |
82a1fcb9 IM |
852 | }, |
853 | { | |
82a1fcb9 IM |
854 | .procname = "hung_task_warnings", |
855 | .data = &sysctl_hung_task_warnings, | |
90739081 | 856 | .maxlen = sizeof(unsigned long), |
82a1fcb9 | 857 | .mode = 0644, |
6d456111 | 858 | .proc_handler = proc_doulongvec_minmax, |
82a1fcb9 | 859 | }, |
c4f3b63f | 860 | #endif |
bebfa101 AK |
861 | #ifdef CONFIG_COMPAT |
862 | { | |
bebfa101 AK |
863 | .procname = "compat-log", |
864 | .data = &compat_log, | |
865 | .maxlen = sizeof (int), | |
866 | .mode = 0644, | |
6d456111 | 867 | .proc_handler = proc_dointvec, |
bebfa101 | 868 | }, |
951f22d5 | 869 | #endif |
23f78d4a IM |
870 | #ifdef CONFIG_RT_MUTEXES |
871 | { | |
23f78d4a IM |
872 | .procname = "max_lock_depth", |
873 | .data = &max_lock_depth, | |
874 | .maxlen = sizeof(int), | |
875 | .mode = 0644, | |
6d456111 | 876 | .proc_handler = proc_dointvec, |
23f78d4a | 877 | }, |
5096add8 | 878 | #endif |
10a0a8d4 | 879 | { |
10a0a8d4 JF |
880 | .procname = "poweroff_cmd", |
881 | .data = &poweroff_cmd, | |
882 | .maxlen = POWEROFF_CMD_PATH_LEN, | |
883 | .mode = 0644, | |
6d456111 | 884 | .proc_handler = proc_dostring, |
10a0a8d4 | 885 | }, |
0b77f5bf DH |
886 | #ifdef CONFIG_KEYS |
887 | { | |
0b77f5bf DH |
888 | .procname = "keys", |
889 | .mode = 0555, | |
890 | .child = key_sysctls, | |
891 | }, | |
892 | #endif | |
31a72bce PM |
893 | #ifdef CONFIG_RCU_TORTURE_TEST |
894 | { | |
31a72bce PM |
895 | .procname = "rcutorture_runnable", |
896 | .data = &rcutorture_runnable, | |
897 | .maxlen = sizeof(int), | |
898 | .mode = 0644, | |
6d456111 | 899 | .proc_handler = proc_dointvec, |
31a72bce PM |
900 | }, |
901 | #endif | |
12e22c5e DH |
902 | #ifdef CONFIG_SLOW_WORK |
903 | { | |
12e22c5e DH |
904 | .procname = "slow-work", |
905 | .mode = 0555, | |
906 | .child = slow_work_sysctls, | |
907 | }, | |
908 | #endif | |
cdd6c482 | 909 | #ifdef CONFIG_PERF_EVENTS |
1ccd1549 | 910 | { |
cdd6c482 IM |
911 | .procname = "perf_event_paranoid", |
912 | .data = &sysctl_perf_event_paranoid, | |
913 | .maxlen = sizeof(sysctl_perf_event_paranoid), | |
1ccd1549 | 914 | .mode = 0644, |
6d456111 | 915 | .proc_handler = proc_dointvec, |
1ccd1549 | 916 | }, |
c5078f78 | 917 | { |
cdd6c482 IM |
918 | .procname = "perf_event_mlock_kb", |
919 | .data = &sysctl_perf_event_mlock, | |
920 | .maxlen = sizeof(sysctl_perf_event_mlock), | |
c5078f78 | 921 | .mode = 0644, |
6d456111 | 922 | .proc_handler = proc_dointvec, |
c5078f78 | 923 | }, |
a78ac325 | 924 | { |
cdd6c482 IM |
925 | .procname = "perf_event_max_sample_rate", |
926 | .data = &sysctl_perf_event_sample_rate, | |
927 | .maxlen = sizeof(sysctl_perf_event_sample_rate), | |
a78ac325 | 928 | .mode = 0644, |
6d456111 | 929 | .proc_handler = proc_dointvec, |
a78ac325 | 930 | }, |
1ccd1549 | 931 | #endif |
dfec072e VN |
932 | #ifdef CONFIG_KMEMCHECK |
933 | { | |
dfec072e VN |
934 | .procname = "kmemcheck", |
935 | .data = &kmemcheck_enabled, | |
936 | .maxlen = sizeof(int), | |
937 | .mode = 0644, | |
6d456111 | 938 | .proc_handler = proc_dointvec, |
dfec072e VN |
939 | }, |
940 | #endif | |
cb684b5b | 941 | #ifdef CONFIG_BLOCK |
5e605b64 | 942 | { |
5e605b64 JA |
943 | .procname = "blk_iopoll", |
944 | .data = &blk_iopoll_enabled, | |
945 | .maxlen = sizeof(int), | |
946 | .mode = 0644, | |
6d456111 | 947 | .proc_handler = proc_dointvec, |
5e605b64 | 948 | }, |
cb684b5b | 949 | #endif |
ed2c12f3 AM |
950 | /* |
951 | * NOTE: do not add new entries to this table unless you have read | |
952 | * Documentation/sysctl/ctl_unnumbered.txt | |
953 | */ | |
6fce56ec | 954 | { } |
1da177e4 LT |
955 | }; |
956 | ||
d8217f07 | 957 | static struct ctl_table vm_table[] = { |
1da177e4 | 958 | { |
1da177e4 LT |
959 | .procname = "overcommit_memory", |
960 | .data = &sysctl_overcommit_memory, | |
961 | .maxlen = sizeof(sysctl_overcommit_memory), | |
962 | .mode = 0644, | |
6d456111 | 963 | .proc_handler = proc_dointvec, |
1da177e4 | 964 | }, |
fadd8fbd | 965 | { |
fadd8fbd KH |
966 | .procname = "panic_on_oom", |
967 | .data = &sysctl_panic_on_oom, | |
968 | .maxlen = sizeof(sysctl_panic_on_oom), | |
969 | .mode = 0644, | |
6d456111 | 970 | .proc_handler = proc_dointvec, |
fadd8fbd | 971 | }, |
fe071d7e | 972 | { |
fe071d7e DR |
973 | .procname = "oom_kill_allocating_task", |
974 | .data = &sysctl_oom_kill_allocating_task, | |
975 | .maxlen = sizeof(sysctl_oom_kill_allocating_task), | |
976 | .mode = 0644, | |
6d456111 | 977 | .proc_handler = proc_dointvec, |
fe071d7e | 978 | }, |
fef1bdd6 | 979 | { |
fef1bdd6 DR |
980 | .procname = "oom_dump_tasks", |
981 | .data = &sysctl_oom_dump_tasks, | |
982 | .maxlen = sizeof(sysctl_oom_dump_tasks), | |
983 | .mode = 0644, | |
6d456111 | 984 | .proc_handler = proc_dointvec, |
fef1bdd6 | 985 | }, |
1da177e4 | 986 | { |
1da177e4 LT |
987 | .procname = "overcommit_ratio", |
988 | .data = &sysctl_overcommit_ratio, | |
989 | .maxlen = sizeof(sysctl_overcommit_ratio), | |
990 | .mode = 0644, | |
6d456111 | 991 | .proc_handler = proc_dointvec, |
1da177e4 LT |
992 | }, |
993 | { | |
1da177e4 LT |
994 | .procname = "page-cluster", |
995 | .data = &page_cluster, | |
996 | .maxlen = sizeof(int), | |
997 | .mode = 0644, | |
6d456111 | 998 | .proc_handler = proc_dointvec, |
1da177e4 LT |
999 | }, |
1000 | { | |
1da177e4 LT |
1001 | .procname = "dirty_background_ratio", |
1002 | .data = &dirty_background_ratio, | |
1003 | .maxlen = sizeof(dirty_background_ratio), | |
1004 | .mode = 0644, | |
6d456111 | 1005 | .proc_handler = dirty_background_ratio_handler, |
1da177e4 LT |
1006 | .extra1 = &zero, |
1007 | .extra2 = &one_hundred, | |
1008 | }, | |
2da02997 | 1009 | { |
2da02997 DR |
1010 | .procname = "dirty_background_bytes", |
1011 | .data = &dirty_background_bytes, | |
1012 | .maxlen = sizeof(dirty_background_bytes), | |
1013 | .mode = 0644, | |
6d456111 | 1014 | .proc_handler = dirty_background_bytes_handler, |
fc3501d4 | 1015 | .extra1 = &one_ul, |
2da02997 | 1016 | }, |
1da177e4 | 1017 | { |
1da177e4 LT |
1018 | .procname = "dirty_ratio", |
1019 | .data = &vm_dirty_ratio, | |
1020 | .maxlen = sizeof(vm_dirty_ratio), | |
1021 | .mode = 0644, | |
6d456111 | 1022 | .proc_handler = dirty_ratio_handler, |
1da177e4 LT |
1023 | .extra1 = &zero, |
1024 | .extra2 = &one_hundred, | |
1025 | }, | |
2da02997 | 1026 | { |
2da02997 DR |
1027 | .procname = "dirty_bytes", |
1028 | .data = &vm_dirty_bytes, | |
1029 | .maxlen = sizeof(vm_dirty_bytes), | |
1030 | .mode = 0644, | |
6d456111 | 1031 | .proc_handler = dirty_bytes_handler, |
9e4a5bda | 1032 | .extra1 = &dirty_bytes_min, |
2da02997 | 1033 | }, |
1da177e4 | 1034 | { |
1da177e4 | 1035 | .procname = "dirty_writeback_centisecs", |
f6ef9438 BS |
1036 | .data = &dirty_writeback_interval, |
1037 | .maxlen = sizeof(dirty_writeback_interval), | |
1da177e4 | 1038 | .mode = 0644, |
6d456111 | 1039 | .proc_handler = dirty_writeback_centisecs_handler, |
1da177e4 LT |
1040 | }, |
1041 | { | |
1da177e4 | 1042 | .procname = "dirty_expire_centisecs", |
f6ef9438 BS |
1043 | .data = &dirty_expire_interval, |
1044 | .maxlen = sizeof(dirty_expire_interval), | |
1da177e4 | 1045 | .mode = 0644, |
6d456111 | 1046 | .proc_handler = proc_dointvec, |
1da177e4 LT |
1047 | }, |
1048 | { | |
1da177e4 LT |
1049 | .procname = "nr_pdflush_threads", |
1050 | .data = &nr_pdflush_threads, | |
1051 | .maxlen = sizeof nr_pdflush_threads, | |
1052 | .mode = 0444 /* read-only*/, | |
6d456111 | 1053 | .proc_handler = proc_dointvec, |
1da177e4 LT |
1054 | }, |
1055 | { | |
1da177e4 LT |
1056 | .procname = "swappiness", |
1057 | .data = &vm_swappiness, | |
1058 | .maxlen = sizeof(vm_swappiness), | |
1059 | .mode = 0644, | |
6d456111 | 1060 | .proc_handler = proc_dointvec_minmax, |
1da177e4 LT |
1061 | .extra1 = &zero, |
1062 | .extra2 = &one_hundred, | |
1063 | }, | |
1064 | #ifdef CONFIG_HUGETLB_PAGE | |
06808b08 | 1065 | { |
1da177e4 | 1066 | .procname = "nr_hugepages", |
e5ff2159 | 1067 | .data = NULL, |
1da177e4 LT |
1068 | .maxlen = sizeof(unsigned long), |
1069 | .mode = 0644, | |
6d456111 | 1070 | .proc_handler = hugetlb_sysctl_handler, |
1da177e4 LT |
1071 | .extra1 = (void *)&hugetlb_zero, |
1072 | .extra2 = (void *)&hugetlb_infinity, | |
06808b08 LS |
1073 | }, |
1074 | #ifdef CONFIG_NUMA | |
1075 | { | |
1076 | .procname = "nr_hugepages_mempolicy", | |
1077 | .data = NULL, | |
1078 | .maxlen = sizeof(unsigned long), | |
1079 | .mode = 0644, | |
1080 | .proc_handler = &hugetlb_mempolicy_sysctl_handler, | |
1081 | .extra1 = (void *)&hugetlb_zero, | |
1082 | .extra2 = (void *)&hugetlb_infinity, | |
1083 | }, | |
1084 | #endif | |
1da177e4 | 1085 | { |
1da177e4 LT |
1086 | .procname = "hugetlb_shm_group", |
1087 | .data = &sysctl_hugetlb_shm_group, | |
1088 | .maxlen = sizeof(gid_t), | |
1089 | .mode = 0644, | |
6d456111 | 1090 | .proc_handler = proc_dointvec, |
1da177e4 | 1091 | }, |
396faf03 | 1092 | { |
396faf03 MG |
1093 | .procname = "hugepages_treat_as_movable", |
1094 | .data = &hugepages_treat_as_movable, | |
1095 | .maxlen = sizeof(int), | |
1096 | .mode = 0644, | |
6d456111 | 1097 | .proc_handler = hugetlb_treat_movable_handler, |
396faf03 | 1098 | }, |
d1c3fb1f | 1099 | { |
d1c3fb1f | 1100 | .procname = "nr_overcommit_hugepages", |
e5ff2159 AK |
1101 | .data = NULL, |
1102 | .maxlen = sizeof(unsigned long), | |
d1c3fb1f | 1103 | .mode = 0644, |
6d456111 | 1104 | .proc_handler = hugetlb_overcommit_handler, |
e5ff2159 AK |
1105 | .extra1 = (void *)&hugetlb_zero, |
1106 | .extra2 = (void *)&hugetlb_infinity, | |
d1c3fb1f | 1107 | }, |
1da177e4 LT |
1108 | #endif |
1109 | { | |
1da177e4 LT |
1110 | .procname = "lowmem_reserve_ratio", |
1111 | .data = &sysctl_lowmem_reserve_ratio, | |
1112 | .maxlen = sizeof(sysctl_lowmem_reserve_ratio), | |
1113 | .mode = 0644, | |
6d456111 | 1114 | .proc_handler = lowmem_reserve_ratio_sysctl_handler, |
1da177e4 | 1115 | }, |
9d0243bc | 1116 | { |
9d0243bc AM |
1117 | .procname = "drop_caches", |
1118 | .data = &sysctl_drop_caches, | |
1119 | .maxlen = sizeof(int), | |
1120 | .mode = 0644, | |
1121 | .proc_handler = drop_caches_sysctl_handler, | |
9d0243bc | 1122 | }, |
1da177e4 | 1123 | { |
1da177e4 LT |
1124 | .procname = "min_free_kbytes", |
1125 | .data = &min_free_kbytes, | |
1126 | .maxlen = sizeof(min_free_kbytes), | |
1127 | .mode = 0644, | |
6d456111 | 1128 | .proc_handler = min_free_kbytes_sysctl_handler, |
1da177e4 LT |
1129 | .extra1 = &zero, |
1130 | }, | |
8ad4b1fb | 1131 | { |
8ad4b1fb RS |
1132 | .procname = "percpu_pagelist_fraction", |
1133 | .data = &percpu_pagelist_fraction, | |
1134 | .maxlen = sizeof(percpu_pagelist_fraction), | |
1135 | .mode = 0644, | |
6d456111 | 1136 | .proc_handler = percpu_pagelist_fraction_sysctl_handler, |
8ad4b1fb RS |
1137 | .extra1 = &min_percpu_pagelist_fract, |
1138 | }, | |
1da177e4 LT |
1139 | #ifdef CONFIG_MMU |
1140 | { | |
1da177e4 LT |
1141 | .procname = "max_map_count", |
1142 | .data = &sysctl_max_map_count, | |
1143 | .maxlen = sizeof(sysctl_max_map_count), | |
1144 | .mode = 0644, | |
3e26120c | 1145 | .proc_handler = proc_dointvec_minmax, |
70da2340 | 1146 | .extra1 = &zero, |
1da177e4 | 1147 | }, |
dd8632a1 PM |
1148 | #else |
1149 | { | |
dd8632a1 PM |
1150 | .procname = "nr_trim_pages", |
1151 | .data = &sysctl_nr_trim_pages, | |
1152 | .maxlen = sizeof(sysctl_nr_trim_pages), | |
1153 | .mode = 0644, | |
6d456111 | 1154 | .proc_handler = proc_dointvec_minmax, |
dd8632a1 PM |
1155 | .extra1 = &zero, |
1156 | }, | |
1da177e4 LT |
1157 | #endif |
1158 | { | |
1da177e4 LT |
1159 | .procname = "laptop_mode", |
1160 | .data = &laptop_mode, | |
1161 | .maxlen = sizeof(laptop_mode), | |
1162 | .mode = 0644, | |
6d456111 | 1163 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
1164 | }, |
1165 | { | |
1da177e4 LT |
1166 | .procname = "block_dump", |
1167 | .data = &block_dump, | |
1168 | .maxlen = sizeof(block_dump), | |
1169 | .mode = 0644, | |
6d456111 | 1170 | .proc_handler = proc_dointvec, |
1da177e4 LT |
1171 | .extra1 = &zero, |
1172 | }, | |
1173 | { | |
1da177e4 LT |
1174 | .procname = "vfs_cache_pressure", |
1175 | .data = &sysctl_vfs_cache_pressure, | |
1176 | .maxlen = sizeof(sysctl_vfs_cache_pressure), | |
1177 | .mode = 0644, | |
6d456111 | 1178 | .proc_handler = proc_dointvec, |
1da177e4 LT |
1179 | .extra1 = &zero, |
1180 | }, | |
1181 | #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT | |
1182 | { | |
1da177e4 LT |
1183 | .procname = "legacy_va_layout", |
1184 | .data = &sysctl_legacy_va_layout, | |
1185 | .maxlen = sizeof(sysctl_legacy_va_layout), | |
1186 | .mode = 0644, | |
6d456111 | 1187 | .proc_handler = proc_dointvec, |
1da177e4 LT |
1188 | .extra1 = &zero, |
1189 | }, | |
1190 | #endif | |
1743660b CL |
1191 | #ifdef CONFIG_NUMA |
1192 | { | |
1743660b CL |
1193 | .procname = "zone_reclaim_mode", |
1194 | .data = &zone_reclaim_mode, | |
1195 | .maxlen = sizeof(zone_reclaim_mode), | |
1196 | .mode = 0644, | |
6d456111 | 1197 | .proc_handler = proc_dointvec, |
c84db23c | 1198 | .extra1 = &zero, |
1743660b | 1199 | }, |
9614634f | 1200 | { |
9614634f CL |
1201 | .procname = "min_unmapped_ratio", |
1202 | .data = &sysctl_min_unmapped_ratio, | |
1203 | .maxlen = sizeof(sysctl_min_unmapped_ratio), | |
1204 | .mode = 0644, | |
6d456111 | 1205 | .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler, |
9614634f CL |
1206 | .extra1 = &zero, |
1207 | .extra2 = &one_hundred, | |
1208 | }, | |
0ff38490 | 1209 | { |
0ff38490 CL |
1210 | .procname = "min_slab_ratio", |
1211 | .data = &sysctl_min_slab_ratio, | |
1212 | .maxlen = sizeof(sysctl_min_slab_ratio), | |
1213 | .mode = 0644, | |
6d456111 | 1214 | .proc_handler = sysctl_min_slab_ratio_sysctl_handler, |
0ff38490 CL |
1215 | .extra1 = &zero, |
1216 | .extra2 = &one_hundred, | |
1217 | }, | |
e6e5494c | 1218 | #endif |
77461ab3 CL |
1219 | #ifdef CONFIG_SMP |
1220 | { | |
77461ab3 CL |
1221 | .procname = "stat_interval", |
1222 | .data = &sysctl_stat_interval, | |
1223 | .maxlen = sizeof(sysctl_stat_interval), | |
1224 | .mode = 0644, | |
6d456111 | 1225 | .proc_handler = proc_dointvec_jiffies, |
77461ab3 CL |
1226 | }, |
1227 | #endif | |
6e141546 | 1228 | #ifdef CONFIG_MMU |
ed032189 | 1229 | { |
ed032189 | 1230 | .procname = "mmap_min_addr", |
788084ab EP |
1231 | .data = &dac_mmap_min_addr, |
1232 | .maxlen = sizeof(unsigned long), | |
ed032189 | 1233 | .mode = 0644, |
6d456111 | 1234 | .proc_handler = mmap_min_addr_handler, |
ed032189 | 1235 | }, |
6e141546 | 1236 | #endif |
f0c0b2b8 KH |
1237 | #ifdef CONFIG_NUMA |
1238 | { | |
f0c0b2b8 KH |
1239 | .procname = "numa_zonelist_order", |
1240 | .data = &numa_zonelist_order, | |
1241 | .maxlen = NUMA_ZONELIST_ORDER_LEN, | |
1242 | .mode = 0644, | |
6d456111 | 1243 | .proc_handler = numa_zonelist_order_handler, |
f0c0b2b8 KH |
1244 | }, |
1245 | #endif | |
2b8232ce | 1246 | #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \ |
5c36e657 | 1247 | (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL)) |
e6e5494c | 1248 | { |
e6e5494c IM |
1249 | .procname = "vdso_enabled", |
1250 | .data = &vdso_enabled, | |
1251 | .maxlen = sizeof(vdso_enabled), | |
1252 | .mode = 0644, | |
6d456111 | 1253 | .proc_handler = proc_dointvec, |
e6e5494c IM |
1254 | .extra1 = &zero, |
1255 | }, | |
1da177e4 | 1256 | #endif |
195cf453 BG |
1257 | #ifdef CONFIG_HIGHMEM |
1258 | { | |
195cf453 BG |
1259 | .procname = "highmem_is_dirtyable", |
1260 | .data = &vm_highmem_is_dirtyable, | |
1261 | .maxlen = sizeof(vm_highmem_is_dirtyable), | |
1262 | .mode = 0644, | |
6d456111 | 1263 | .proc_handler = proc_dointvec_minmax, |
195cf453 BG |
1264 | .extra1 = &zero, |
1265 | .extra2 = &one, | |
1266 | }, | |
1267 | #endif | |
4be6f6bb | 1268 | { |
4be6f6bb PZ |
1269 | .procname = "scan_unevictable_pages", |
1270 | .data = &scan_unevictable_pages, | |
1271 | .maxlen = sizeof(scan_unevictable_pages), | |
1272 | .mode = 0644, | |
6d456111 | 1273 | .proc_handler = scan_unevictable_handler, |
4be6f6bb | 1274 | }, |
6a46079c AK |
1275 | #ifdef CONFIG_MEMORY_FAILURE |
1276 | { | |
6a46079c AK |
1277 | .procname = "memory_failure_early_kill", |
1278 | .data = &sysctl_memory_failure_early_kill, | |
1279 | .maxlen = sizeof(sysctl_memory_failure_early_kill), | |
1280 | .mode = 0644, | |
6d456111 | 1281 | .proc_handler = proc_dointvec_minmax, |
6a46079c AK |
1282 | .extra1 = &zero, |
1283 | .extra2 = &one, | |
1284 | }, | |
1285 | { | |
6a46079c AK |
1286 | .procname = "memory_failure_recovery", |
1287 | .data = &sysctl_memory_failure_recovery, | |
1288 | .maxlen = sizeof(sysctl_memory_failure_recovery), | |
1289 | .mode = 0644, | |
6d456111 | 1290 | .proc_handler = proc_dointvec_minmax, |
6a46079c AK |
1291 | .extra1 = &zero, |
1292 | .extra2 = &one, | |
1293 | }, | |
1294 | #endif | |
1295 | ||
2be7fe07 AM |
1296 | /* |
1297 | * NOTE: do not add new entries to this table unless you have read | |
1298 | * Documentation/sysctl/ctl_unnumbered.txt | |
1299 | */ | |
6fce56ec | 1300 | { } |
1da177e4 LT |
1301 | }; |
1302 | ||
2abc26fc | 1303 | #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) |
d8217f07 | 1304 | static struct ctl_table binfmt_misc_table[] = { |
6fce56ec | 1305 | { } |
2abc26fc EB |
1306 | }; |
1307 | #endif | |
1308 | ||
d8217f07 | 1309 | static struct ctl_table fs_table[] = { |
1da177e4 | 1310 | { |
1da177e4 LT |
1311 | .procname = "inode-nr", |
1312 | .data = &inodes_stat, | |
1313 | .maxlen = 2*sizeof(int), | |
1314 | .mode = 0444, | |
6d456111 | 1315 | .proc_handler = proc_dointvec, |
1da177e4 LT |
1316 | }, |
1317 | { | |
1da177e4 LT |
1318 | .procname = "inode-state", |
1319 | .data = &inodes_stat, | |
1320 | .maxlen = 7*sizeof(int), | |
1321 | .mode = 0444, | |
6d456111 | 1322 | .proc_handler = proc_dointvec, |
1da177e4 LT |
1323 | }, |
1324 | { | |
1da177e4 LT |
1325 | .procname = "file-nr", |
1326 | .data = &files_stat, | |
1327 | .maxlen = 3*sizeof(int), | |
1328 | .mode = 0444, | |
6d456111 | 1329 | .proc_handler = proc_nr_files, |
1da177e4 LT |
1330 | }, |
1331 | { | |
1da177e4 LT |
1332 | .procname = "file-max", |
1333 | .data = &files_stat.max_files, | |
1334 | .maxlen = sizeof(int), | |
1335 | .mode = 0644, | |
6d456111 | 1336 | .proc_handler = proc_dointvec, |
1da177e4 | 1337 | }, |
9cfe015a | 1338 | { |
9cfe015a ED |
1339 | .procname = "nr_open", |
1340 | .data = &sysctl_nr_open, | |
1341 | .maxlen = sizeof(int), | |
1342 | .mode = 0644, | |
6d456111 | 1343 | .proc_handler = proc_dointvec_minmax, |
eceea0b3 AV |
1344 | .extra1 = &sysctl_nr_open_min, |
1345 | .extra2 = &sysctl_nr_open_max, | |
9cfe015a | 1346 | }, |
1da177e4 | 1347 | { |
1da177e4 LT |
1348 | .procname = "dentry-state", |
1349 | .data = &dentry_stat, | |
1350 | .maxlen = 6*sizeof(int), | |
1351 | .mode = 0444, | |
6d456111 | 1352 | .proc_handler = proc_dointvec, |
1da177e4 LT |
1353 | }, |
1354 | { | |
1da177e4 LT |
1355 | .procname = "overflowuid", |
1356 | .data = &fs_overflowuid, | |
1357 | .maxlen = sizeof(int), | |
1358 | .mode = 0644, | |
6d456111 | 1359 | .proc_handler = proc_dointvec_minmax, |
1da177e4 LT |
1360 | .extra1 = &minolduid, |
1361 | .extra2 = &maxolduid, | |
1362 | }, | |
1363 | { | |
1da177e4 LT |
1364 | .procname = "overflowgid", |
1365 | .data = &fs_overflowgid, | |
1366 | .maxlen = sizeof(int), | |
1367 | .mode = 0644, | |
6d456111 | 1368 | .proc_handler = proc_dointvec_minmax, |
1da177e4 LT |
1369 | .extra1 = &minolduid, |
1370 | .extra2 = &maxolduid, | |
1371 | }, | |
bfcd17a6 | 1372 | #ifdef CONFIG_FILE_LOCKING |
1da177e4 | 1373 | { |
1da177e4 LT |
1374 | .procname = "leases-enable", |
1375 | .data = &leases_enable, | |
1376 | .maxlen = sizeof(int), | |
1377 | .mode = 0644, | |
6d456111 | 1378 | .proc_handler = proc_dointvec, |
1da177e4 | 1379 | }, |
bfcd17a6 | 1380 | #endif |
1da177e4 LT |
1381 | #ifdef CONFIG_DNOTIFY |
1382 | { | |
1da177e4 LT |
1383 | .procname = "dir-notify-enable", |
1384 | .data = &dir_notify_enable, | |
1385 | .maxlen = sizeof(int), | |
1386 | .mode = 0644, | |
6d456111 | 1387 | .proc_handler = proc_dointvec, |
1da177e4 LT |
1388 | }, |
1389 | #endif | |
1390 | #ifdef CONFIG_MMU | |
bfcd17a6 | 1391 | #ifdef CONFIG_FILE_LOCKING |
1da177e4 | 1392 | { |
1da177e4 LT |
1393 | .procname = "lease-break-time", |
1394 | .data = &lease_break_time, | |
1395 | .maxlen = sizeof(int), | |
1396 | .mode = 0644, | |
6d456111 | 1397 | .proc_handler = proc_dointvec, |
1da177e4 | 1398 | }, |
bfcd17a6 | 1399 | #endif |
ebf3f09c | 1400 | #ifdef CONFIG_AIO |
1da177e4 | 1401 | { |
1da177e4 LT |
1402 | .procname = "aio-nr", |
1403 | .data = &aio_nr, | |
1404 | .maxlen = sizeof(aio_nr), | |
1405 | .mode = 0444, | |
6d456111 | 1406 | .proc_handler = proc_doulongvec_minmax, |
1da177e4 LT |
1407 | }, |
1408 | { | |
1da177e4 LT |
1409 | .procname = "aio-max-nr", |
1410 | .data = &aio_max_nr, | |
1411 | .maxlen = sizeof(aio_max_nr), | |
1412 | .mode = 0644, | |
6d456111 | 1413 | .proc_handler = proc_doulongvec_minmax, |
1da177e4 | 1414 | }, |
ebf3f09c | 1415 | #endif /* CONFIG_AIO */ |
2d9048e2 | 1416 | #ifdef CONFIG_INOTIFY_USER |
0399cb08 | 1417 | { |
0399cb08 RL |
1418 | .procname = "inotify", |
1419 | .mode = 0555, | |
1420 | .child = inotify_table, | |
1421 | }, | |
1422 | #endif | |
7ef9964e DL |
1423 | #ifdef CONFIG_EPOLL |
1424 | { | |
1425 | .procname = "epoll", | |
1426 | .mode = 0555, | |
1427 | .child = epoll_table, | |
1428 | }, | |
1429 | #endif | |
1da177e4 | 1430 | #endif |
d6e71144 | 1431 | { |
d6e71144 AC |
1432 | .procname = "suid_dumpable", |
1433 | .data = &suid_dumpable, | |
1434 | .maxlen = sizeof(int), | |
1435 | .mode = 0644, | |
6d456111 | 1436 | .proc_handler = proc_dointvec_minmax, |
8e654fba MW |
1437 | .extra1 = &zero, |
1438 | .extra2 = &two, | |
d6e71144 | 1439 | }, |
2abc26fc EB |
1440 | #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) |
1441 | { | |
2abc26fc EB |
1442 | .procname = "binfmt_misc", |
1443 | .mode = 0555, | |
1444 | .child = binfmt_misc_table, | |
1445 | }, | |
1446 | #endif | |
2be7fe07 AM |
1447 | /* |
1448 | * NOTE: do not add new entries to this table unless you have read | |
1449 | * Documentation/sysctl/ctl_unnumbered.txt | |
2be7fe07 | 1450 | */ |
6fce56ec | 1451 | { } |
1da177e4 LT |
1452 | }; |
1453 | ||
d8217f07 | 1454 | static struct ctl_table debug_table[] = { |
ab3c68ee HC |
1455 | #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_SPARC) || \ |
1456 | defined(CONFIG_S390) | |
abd4f750 | 1457 | { |
abd4f750 MAS |
1458 | .procname = "exception-trace", |
1459 | .data = &show_unhandled_signals, | |
1460 | .maxlen = sizeof(int), | |
1461 | .mode = 0644, | |
1462 | .proc_handler = proc_dointvec | |
1463 | }, | |
b2be84df MH |
1464 | #endif |
1465 | #if defined(CONFIG_OPTPROBES) | |
1466 | { | |
1467 | .procname = "kprobes-optimization", | |
1468 | .data = &sysctl_kprobes_optimization, | |
1469 | .maxlen = sizeof(int), | |
1470 | .mode = 0644, | |
1471 | .proc_handler = proc_kprobes_optimization_handler, | |
1472 | .extra1 = &zero, | |
1473 | .extra2 = &one, | |
1474 | }, | |
abd4f750 | 1475 | #endif |
6fce56ec | 1476 | { } |
1da177e4 LT |
1477 | }; |
1478 | ||
d8217f07 | 1479 | static struct ctl_table dev_table[] = { |
6fce56ec | 1480 | { } |
0eeca283 | 1481 | }; |
1da177e4 | 1482 | |
330d57fb AV |
1483 | static DEFINE_SPINLOCK(sysctl_lock); |
1484 | ||
1485 | /* called under sysctl_lock */ | |
1486 | static int use_table(struct ctl_table_header *p) | |
1487 | { | |
1488 | if (unlikely(p->unregistering)) | |
1489 | return 0; | |
1490 | p->used++; | |
1491 | return 1; | |
1492 | } | |
1493 | ||
1494 | /* called under sysctl_lock */ | |
1495 | static void unuse_table(struct ctl_table_header *p) | |
1496 | { | |
1497 | if (!--p->used) | |
1498 | if (unlikely(p->unregistering)) | |
1499 | complete(p->unregistering); | |
1500 | } | |
1501 | ||
1502 | /* called under sysctl_lock, will reacquire if has to wait */ | |
1503 | static void start_unregistering(struct ctl_table_header *p) | |
1504 | { | |
1505 | /* | |
1506 | * if p->used is 0, nobody will ever touch that entry again; | |
1507 | * we'll eliminate all paths to it before dropping sysctl_lock | |
1508 | */ | |
1509 | if (unlikely(p->used)) { | |
1510 | struct completion wait; | |
1511 | init_completion(&wait); | |
1512 | p->unregistering = &wait; | |
1513 | spin_unlock(&sysctl_lock); | |
1514 | wait_for_completion(&wait); | |
1515 | spin_lock(&sysctl_lock); | |
f7e6ced4 AV |
1516 | } else { |
1517 | /* anything non-NULL; we'll never dereference it */ | |
1518 | p->unregistering = ERR_PTR(-EINVAL); | |
330d57fb AV |
1519 | } |
1520 | /* | |
1521 | * do not remove from the list until nobody holds it; walking the | |
1522 | * list in do_sysctl() relies on that. | |
1523 | */ | |
1524 | list_del_init(&p->ctl_entry); | |
1525 | } | |
1526 | ||
f7e6ced4 AV |
1527 | void sysctl_head_get(struct ctl_table_header *head) |
1528 | { | |
1529 | spin_lock(&sysctl_lock); | |
1530 | head->count++; | |
1531 | spin_unlock(&sysctl_lock); | |
1532 | } | |
1533 | ||
1534 | void sysctl_head_put(struct ctl_table_header *head) | |
1535 | { | |
1536 | spin_lock(&sysctl_lock); | |
1537 | if (!--head->count) | |
1538 | kfree(head); | |
1539 | spin_unlock(&sysctl_lock); | |
1540 | } | |
1541 | ||
1542 | struct ctl_table_header *sysctl_head_grab(struct ctl_table_header *head) | |
1543 | { | |
1544 | if (!head) | |
1545 | BUG(); | |
1546 | spin_lock(&sysctl_lock); | |
1547 | if (!use_table(head)) | |
1548 | head = ERR_PTR(-ENOENT); | |
1549 | spin_unlock(&sysctl_lock); | |
1550 | return head; | |
1551 | } | |
1552 | ||
805b5d5e EB |
1553 | void sysctl_head_finish(struct ctl_table_header *head) |
1554 | { | |
1555 | if (!head) | |
1556 | return; | |
1557 | spin_lock(&sysctl_lock); | |
1558 | unuse_table(head); | |
1559 | spin_unlock(&sysctl_lock); | |
1560 | } | |
1561 | ||
73455092 AV |
1562 | static struct ctl_table_set * |
1563 | lookup_header_set(struct ctl_table_root *root, struct nsproxy *namespaces) | |
1564 | { | |
1565 | struct ctl_table_set *set = &root->default_set; | |
1566 | if (root->lookup) | |
1567 | set = root->lookup(root, namespaces); | |
1568 | return set; | |
1569 | } | |
1570 | ||
e51b6ba0 EB |
1571 | static struct list_head * |
1572 | lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces) | |
805b5d5e | 1573 | { |
73455092 AV |
1574 | struct ctl_table_set *set = lookup_header_set(root, namespaces); |
1575 | return &set->list; | |
e51b6ba0 EB |
1576 | } |
1577 | ||
1578 | struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces, | |
1579 | struct ctl_table_header *prev) | |
1580 | { | |
1581 | struct ctl_table_root *root; | |
1582 | struct list_head *header_list; | |
805b5d5e EB |
1583 | struct ctl_table_header *head; |
1584 | struct list_head *tmp; | |
e51b6ba0 | 1585 | |
805b5d5e EB |
1586 | spin_lock(&sysctl_lock); |
1587 | if (prev) { | |
e51b6ba0 | 1588 | head = prev; |
805b5d5e EB |
1589 | tmp = &prev->ctl_entry; |
1590 | unuse_table(prev); | |
1591 | goto next; | |
1592 | } | |
1593 | tmp = &root_table_header.ctl_entry; | |
1594 | for (;;) { | |
1595 | head = list_entry(tmp, struct ctl_table_header, ctl_entry); | |
1596 | ||
1597 | if (!use_table(head)) | |
1598 | goto next; | |
1599 | spin_unlock(&sysctl_lock); | |
1600 | return head; | |
1601 | next: | |
e51b6ba0 | 1602 | root = head->root; |
805b5d5e | 1603 | tmp = tmp->next; |
e51b6ba0 EB |
1604 | header_list = lookup_header_list(root, namespaces); |
1605 | if (tmp != header_list) | |
1606 | continue; | |
1607 | ||
1608 | do { | |
1609 | root = list_entry(root->root_list.next, | |
1610 | struct ctl_table_root, root_list); | |
1611 | if (root == &sysctl_table_root) | |
1612 | goto out; | |
1613 | header_list = lookup_header_list(root, namespaces); | |
1614 | } while (list_empty(header_list)); | |
1615 | tmp = header_list->next; | |
805b5d5e | 1616 | } |
e51b6ba0 | 1617 | out: |
805b5d5e EB |
1618 | spin_unlock(&sysctl_lock); |
1619 | return NULL; | |
1620 | } | |
1621 | ||
e51b6ba0 EB |
1622 | struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev) |
1623 | { | |
1624 | return __sysctl_head_next(current->nsproxy, prev); | |
1625 | } | |
1626 | ||
1627 | void register_sysctl_root(struct ctl_table_root *root) | |
1628 | { | |
1629 | spin_lock(&sysctl_lock); | |
1630 | list_add_tail(&root->root_list, &sysctl_table_root.root_list); | |
1631 | spin_unlock(&sysctl_lock); | |
1632 | } | |
1633 | ||
1da177e4 | 1634 | /* |
1ff007eb | 1635 | * sysctl_perm does NOT grant the superuser all rights automatically, because |
1da177e4 LT |
1636 | * some sysctl variables are readonly even to root. |
1637 | */ | |
1638 | ||
1639 | static int test_perm(int mode, int op) | |
1640 | { | |
76aac0e9 | 1641 | if (!current_euid()) |
1da177e4 LT |
1642 | mode >>= 6; |
1643 | else if (in_egroup_p(0)) | |
1644 | mode >>= 3; | |
e6305c43 | 1645 | if ((op & ~mode & (MAY_READ|MAY_WRITE|MAY_EXEC)) == 0) |
1da177e4 LT |
1646 | return 0; |
1647 | return -EACCES; | |
1648 | } | |
1649 | ||
d7321cd6 | 1650 | int sysctl_perm(struct ctl_table_root *root, struct ctl_table *table, int op) |
1da177e4 LT |
1651 | { |
1652 | int error; | |
d7321cd6 PE |
1653 | int mode; |
1654 | ||
e6305c43 | 1655 | error = security_sysctl(table, op & (MAY_READ | MAY_WRITE | MAY_EXEC)); |
1da177e4 LT |
1656 | if (error) |
1657 | return error; | |
d7321cd6 PE |
1658 | |
1659 | if (root->permissions) | |
1660 | mode = root->permissions(root, current->nsproxy, table); | |
1661 | else | |
1662 | mode = table->mode; | |
1663 | ||
1664 | return test_perm(mode, op); | |
1da177e4 LT |
1665 | } |
1666 | ||
d912b0cc EB |
1667 | static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table) |
1668 | { | |
2315ffa0 | 1669 | for (; table->procname; table++) { |
d912b0cc EB |
1670 | table->parent = parent; |
1671 | if (table->child) | |
1672 | sysctl_set_parent(table, table->child); | |
1673 | } | |
1674 | } | |
1675 | ||
1676 | static __init int sysctl_init(void) | |
1677 | { | |
1678 | sysctl_set_parent(NULL, root_table); | |
88f458e4 HS |
1679 | #ifdef CONFIG_SYSCTL_SYSCALL_CHECK |
1680 | { | |
1681 | int err; | |
1682 | err = sysctl_check_table(current->nsproxy, root_table); | |
1683 | } | |
1684 | #endif | |
d912b0cc EB |
1685 | return 0; |
1686 | } | |
1687 | ||
1688 | core_initcall(sysctl_init); | |
1689 | ||
bfbcf034 AV |
1690 | static struct ctl_table *is_branch_in(struct ctl_table *branch, |
1691 | struct ctl_table *table) | |
ae7edecc AV |
1692 | { |
1693 | struct ctl_table *p; | |
1694 | const char *s = branch->procname; | |
1695 | ||
1696 | /* branch should have named subdirectory as its first element */ | |
1697 | if (!s || !branch->child) | |
bfbcf034 | 1698 | return NULL; |
ae7edecc AV |
1699 | |
1700 | /* ... and nothing else */ | |
2315ffa0 | 1701 | if (branch[1].procname) |
bfbcf034 | 1702 | return NULL; |
ae7edecc AV |
1703 | |
1704 | /* table should contain subdirectory with the same name */ | |
2315ffa0 | 1705 | for (p = table; p->procname; p++) { |
ae7edecc AV |
1706 | if (!p->child) |
1707 | continue; | |
1708 | if (p->procname && strcmp(p->procname, s) == 0) | |
bfbcf034 | 1709 | return p; |
ae7edecc | 1710 | } |
bfbcf034 | 1711 | return NULL; |
ae7edecc AV |
1712 | } |
1713 | ||
1714 | /* see if attaching q to p would be an improvement */ | |
1715 | static void try_attach(struct ctl_table_header *p, struct ctl_table_header *q) | |
1716 | { | |
1717 | struct ctl_table *to = p->ctl_table, *by = q->ctl_table; | |
bfbcf034 | 1718 | struct ctl_table *next; |
ae7edecc AV |
1719 | int is_better = 0; |
1720 | int not_in_parent = !p->attached_by; | |
1721 | ||
bfbcf034 | 1722 | while ((next = is_branch_in(by, to)) != NULL) { |
ae7edecc AV |
1723 | if (by == q->attached_by) |
1724 | is_better = 1; | |
1725 | if (to == p->attached_by) | |
1726 | not_in_parent = 1; | |
1727 | by = by->child; | |
bfbcf034 | 1728 | to = next->child; |
ae7edecc AV |
1729 | } |
1730 | ||
1731 | if (is_better && not_in_parent) { | |
1732 | q->attached_by = by; | |
1733 | q->attached_to = to; | |
1734 | q->parent = p; | |
1735 | } | |
1736 | } | |
1737 | ||
1da177e4 | 1738 | /** |
e51b6ba0 EB |
1739 | * __register_sysctl_paths - register a sysctl hierarchy |
1740 | * @root: List of sysctl headers to register on | |
1741 | * @namespaces: Data to compute which lists of sysctl entries are visible | |
29e796fd | 1742 | * @path: The path to the directory the sysctl table is in. |
1da177e4 | 1743 | * @table: the top-level table structure |
1da177e4 LT |
1744 | * |
1745 | * Register a sysctl table hierarchy. @table should be a filled in ctl_table | |
29e796fd | 1746 | * array. A completely 0 filled entry terminates the table. |
1da177e4 | 1747 | * |
d8217f07 | 1748 | * The members of the &struct ctl_table structure are used as follows: |
1da177e4 | 1749 | * |
1da177e4 LT |
1750 | * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not |
1751 | * enter a sysctl file | |
1752 | * | |
1753 | * data - a pointer to data for use by proc_handler | |
1754 | * | |
1755 | * maxlen - the maximum size in bytes of the data | |
1756 | * | |
1757 | * mode - the file permissions for the /proc/sys file, and for sysctl(2) | |
1758 | * | |
1759 | * child - a pointer to the child sysctl table if this entry is a directory, or | |
1760 | * %NULL. | |
1761 | * | |
1762 | * proc_handler - the text handler routine (described below) | |
1763 | * | |
1da177e4 LT |
1764 | * de - for internal use by the sysctl routines |
1765 | * | |
1766 | * extra1, extra2 - extra pointers usable by the proc handler routines | |
1767 | * | |
1768 | * Leaf nodes in the sysctl tree will be represented by a single file | |
1769 | * under /proc; non-leaf nodes will be represented by directories. | |
1770 | * | |
1771 | * sysctl(2) can automatically manage read and write requests through | |
1772 | * the sysctl table. The data and maxlen fields of the ctl_table | |
1773 | * struct enable minimal validation of the values being written to be | |
1774 | * performed, and the mode field allows minimal authentication. | |
1775 | * | |
1da177e4 LT |
1776 | * There must be a proc_handler routine for any terminal nodes |
1777 | * mirrored under /proc/sys (non-terminals are handled by a built-in | |
1778 | * directory handler). Several default handlers are available to | |
1779 | * cover common cases - | |
1780 | * | |
1781 | * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(), | |
1782 | * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(), | |
1783 | * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax() | |
1784 | * | |
1785 | * It is the handler's job to read the input buffer from user memory | |
1786 | * and process it. The handler should return 0 on success. | |
1787 | * | |
1788 | * This routine returns %NULL on a failure to register, and a pointer | |
1789 | * to the table header on success. | |
1790 | */ | |
e51b6ba0 EB |
1791 | struct ctl_table_header *__register_sysctl_paths( |
1792 | struct ctl_table_root *root, | |
1793 | struct nsproxy *namespaces, | |
1794 | const struct ctl_path *path, struct ctl_table *table) | |
1da177e4 | 1795 | { |
29e796fd EB |
1796 | struct ctl_table_header *header; |
1797 | struct ctl_table *new, **prevp; | |
1798 | unsigned int n, npath; | |
ae7edecc | 1799 | struct ctl_table_set *set; |
29e796fd EB |
1800 | |
1801 | /* Count the path components */ | |
2315ffa0 | 1802 | for (npath = 0; path[npath].procname; ++npath) |
29e796fd EB |
1803 | ; |
1804 | ||
1805 | /* | |
1806 | * For each path component, allocate a 2-element ctl_table array. | |
1807 | * The first array element will be filled with the sysctl entry | |
2315ffa0 | 1808 | * for this, the second will be the sentinel (procname == 0). |
29e796fd EB |
1809 | * |
1810 | * We allocate everything in one go so that we don't have to | |
1811 | * worry about freeing additional memory in unregister_sysctl_table. | |
1812 | */ | |
1813 | header = kzalloc(sizeof(struct ctl_table_header) + | |
1814 | (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL); | |
1815 | if (!header) | |
1da177e4 | 1816 | return NULL; |
29e796fd EB |
1817 | |
1818 | new = (struct ctl_table *) (header + 1); | |
1819 | ||
1820 | /* Now connect the dots */ | |
1821 | prevp = &header->ctl_table; | |
1822 | for (n = 0; n < npath; ++n, ++path) { | |
1823 | /* Copy the procname */ | |
1824 | new->procname = path->procname; | |
29e796fd EB |
1825 | new->mode = 0555; |
1826 | ||
1827 | *prevp = new; | |
1828 | prevp = &new->child; | |
1829 | ||
1830 | new += 2; | |
1831 | } | |
1832 | *prevp = table; | |
23eb06de | 1833 | header->ctl_table_arg = table; |
29e796fd EB |
1834 | |
1835 | INIT_LIST_HEAD(&header->ctl_entry); | |
1836 | header->used = 0; | |
1837 | header->unregistering = NULL; | |
e51b6ba0 | 1838 | header->root = root; |
29e796fd | 1839 | sysctl_set_parent(NULL, header->ctl_table); |
f7e6ced4 | 1840 | header->count = 1; |
88f458e4 | 1841 | #ifdef CONFIG_SYSCTL_SYSCALL_CHECK |
e51b6ba0 | 1842 | if (sysctl_check_table(namespaces, header->ctl_table)) { |
29e796fd | 1843 | kfree(header); |
fc6cd25b EB |
1844 | return NULL; |
1845 | } | |
88f458e4 | 1846 | #endif |
330d57fb | 1847 | spin_lock(&sysctl_lock); |
73455092 | 1848 | header->set = lookup_header_set(root, namespaces); |
ae7edecc AV |
1849 | header->attached_by = header->ctl_table; |
1850 | header->attached_to = root_table; | |
1851 | header->parent = &root_table_header; | |
1852 | for (set = header->set; set; set = set->parent) { | |
1853 | struct ctl_table_header *p; | |
1854 | list_for_each_entry(p, &set->list, ctl_entry) { | |
1855 | if (p->unregistering) | |
1856 | continue; | |
1857 | try_attach(p, header); | |
1858 | } | |
1859 | } | |
1860 | header->parent->count++; | |
73455092 | 1861 | list_add_tail(&header->ctl_entry, &header->set->list); |
330d57fb | 1862 | spin_unlock(&sysctl_lock); |
29e796fd EB |
1863 | |
1864 | return header; | |
1865 | } | |
1866 | ||
e51b6ba0 EB |
1867 | /** |
1868 | * register_sysctl_table_path - register a sysctl table hierarchy | |
1869 | * @path: The path to the directory the sysctl table is in. | |
1870 | * @table: the top-level table structure | |
1871 | * | |
1872 | * Register a sysctl table hierarchy. @table should be a filled in ctl_table | |
1873 | * array. A completely 0 filled entry terminates the table. | |
1874 | * | |
1875 | * See __register_sysctl_paths for more details. | |
1876 | */ | |
1877 | struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path, | |
1878 | struct ctl_table *table) | |
1879 | { | |
1880 | return __register_sysctl_paths(&sysctl_table_root, current->nsproxy, | |
1881 | path, table); | |
1882 | } | |
1883 | ||
29e796fd EB |
1884 | /** |
1885 | * register_sysctl_table - register a sysctl table hierarchy | |
1886 | * @table: the top-level table structure | |
1887 | * | |
1888 | * Register a sysctl table hierarchy. @table should be a filled in ctl_table | |
1889 | * array. A completely 0 filled entry terminates the table. | |
1890 | * | |
1891 | * See register_sysctl_paths for more details. | |
1892 | */ | |
1893 | struct ctl_table_header *register_sysctl_table(struct ctl_table *table) | |
1894 | { | |
1895 | static const struct ctl_path null_path[] = { {} }; | |
1896 | ||
1897 | return register_sysctl_paths(null_path, table); | |
1da177e4 LT |
1898 | } |
1899 | ||
1900 | /** | |
1901 | * unregister_sysctl_table - unregister a sysctl table hierarchy | |
1902 | * @header: the header returned from register_sysctl_table | |
1903 | * | |
1904 | * Unregisters the sysctl table and all children. proc entries may not | |
1905 | * actually be removed until they are no longer used by anyone. | |
1906 | */ | |
1907 | void unregister_sysctl_table(struct ctl_table_header * header) | |
1908 | { | |
330d57fb | 1909 | might_sleep(); |
f1dad166 PE |
1910 | |
1911 | if (header == NULL) | |
1912 | return; | |
1913 | ||
330d57fb AV |
1914 | spin_lock(&sysctl_lock); |
1915 | start_unregistering(header); | |
ae7edecc AV |
1916 | if (!--header->parent->count) { |
1917 | WARN_ON(1); | |
1918 | kfree(header->parent); | |
1919 | } | |
f7e6ced4 AV |
1920 | if (!--header->count) |
1921 | kfree(header); | |
330d57fb | 1922 | spin_unlock(&sysctl_lock); |
1da177e4 LT |
1923 | } |
1924 | ||
9043476f AV |
1925 | int sysctl_is_seen(struct ctl_table_header *p) |
1926 | { | |
1927 | struct ctl_table_set *set = p->set; | |
1928 | int res; | |
1929 | spin_lock(&sysctl_lock); | |
1930 | if (p->unregistering) | |
1931 | res = 0; | |
1932 | else if (!set->is_seen) | |
1933 | res = 1; | |
1934 | else | |
1935 | res = set->is_seen(set); | |
1936 | spin_unlock(&sysctl_lock); | |
1937 | return res; | |
1938 | } | |
1939 | ||
73455092 AV |
1940 | void setup_sysctl_set(struct ctl_table_set *p, |
1941 | struct ctl_table_set *parent, | |
1942 | int (*is_seen)(struct ctl_table_set *)) | |
1943 | { | |
1944 | INIT_LIST_HEAD(&p->list); | |
1945 | p->parent = parent ? parent : &sysctl_table_root.default_set; | |
1946 | p->is_seen = is_seen; | |
1947 | } | |
1948 | ||
b89a8171 | 1949 | #else /* !CONFIG_SYSCTL */ |
d8217f07 | 1950 | struct ctl_table_header *register_sysctl_table(struct ctl_table * table) |
b89a8171 EB |
1951 | { |
1952 | return NULL; | |
1953 | } | |
1954 | ||
29e796fd EB |
1955 | struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path, |
1956 | struct ctl_table *table) | |
1957 | { | |
1958 | return NULL; | |
1959 | } | |
1960 | ||
b89a8171 EB |
1961 | void unregister_sysctl_table(struct ctl_table_header * table) |
1962 | { | |
1963 | } | |
1964 | ||
73455092 AV |
1965 | void setup_sysctl_set(struct ctl_table_set *p, |
1966 | struct ctl_table_set *parent, | |
1967 | int (*is_seen)(struct ctl_table_set *)) | |
1968 | { | |
1969 | } | |
1970 | ||
f7e6ced4 AV |
1971 | void sysctl_head_put(struct ctl_table_header *head) |
1972 | { | |
1973 | } | |
1974 | ||
b89a8171 EB |
1975 | #endif /* CONFIG_SYSCTL */ |
1976 | ||
1da177e4 LT |
1977 | /* |
1978 | * /proc/sys support | |
1979 | */ | |
1980 | ||
b89a8171 | 1981 | #ifdef CONFIG_PROC_SYSCTL |
1da177e4 | 1982 | |
b1ba4ddd | 1983 | static int _proc_do_string(void* data, int maxlen, int write, |
8d65af78 | 1984 | void __user *buffer, |
b1ba4ddd | 1985 | size_t *lenp, loff_t *ppos) |
1da177e4 LT |
1986 | { |
1987 | size_t len; | |
1988 | char __user *p; | |
1989 | char c; | |
8d060877 ON |
1990 | |
1991 | if (!data || !maxlen || !*lenp) { | |
1da177e4 LT |
1992 | *lenp = 0; |
1993 | return 0; | |
1994 | } | |
8d060877 | 1995 | |
1da177e4 LT |
1996 | if (write) { |
1997 | len = 0; | |
1998 | p = buffer; | |
1999 | while (len < *lenp) { | |
2000 | if (get_user(c, p++)) | |
2001 | return -EFAULT; | |
2002 | if (c == 0 || c == '\n') | |
2003 | break; | |
2004 | len++; | |
2005 | } | |
f5dd3d6f SV |
2006 | if (len >= maxlen) |
2007 | len = maxlen-1; | |
2008 | if(copy_from_user(data, buffer, len)) | |
1da177e4 | 2009 | return -EFAULT; |
f5dd3d6f | 2010 | ((char *) data)[len] = 0; |
1da177e4 LT |
2011 | *ppos += *lenp; |
2012 | } else { | |
f5dd3d6f SV |
2013 | len = strlen(data); |
2014 | if (len > maxlen) | |
2015 | len = maxlen; | |
8d060877 ON |
2016 | |
2017 | if (*ppos > len) { | |
2018 | *lenp = 0; | |
2019 | return 0; | |
2020 | } | |
2021 | ||
2022 | data += *ppos; | |
2023 | len -= *ppos; | |
2024 | ||
1da177e4 LT |
2025 | if (len > *lenp) |
2026 | len = *lenp; | |
2027 | if (len) | |
f5dd3d6f | 2028 | if(copy_to_user(buffer, data, len)) |
1da177e4 LT |
2029 | return -EFAULT; |
2030 | if (len < *lenp) { | |
2031 | if(put_user('\n', ((char __user *) buffer) + len)) | |
2032 | return -EFAULT; | |
2033 | len++; | |
2034 | } | |
2035 | *lenp = len; | |
2036 | *ppos += len; | |
2037 | } | |
2038 | return 0; | |
2039 | } | |
2040 | ||
f5dd3d6f SV |
2041 | /** |
2042 | * proc_dostring - read a string sysctl | |
2043 | * @table: the sysctl table | |
2044 | * @write: %TRUE if this is a write to the sysctl file | |
f5dd3d6f SV |
2045 | * @buffer: the user buffer |
2046 | * @lenp: the size of the user buffer | |
2047 | * @ppos: file position | |
2048 | * | |
2049 | * Reads/writes a string from/to the user buffer. If the kernel | |
2050 | * buffer provided is not large enough to hold the string, the | |
2051 | * string is truncated. The copied string is %NULL-terminated. | |
2052 | * If the string is being read by the user process, it is copied | |
2053 | * and a newline '\n' is added. It is truncated if the buffer is | |
2054 | * not large enough. | |
2055 | * | |
2056 | * Returns 0 on success. | |
2057 | */ | |
8d65af78 | 2058 | int proc_dostring(struct ctl_table *table, int write, |
f5dd3d6f SV |
2059 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2060 | { | |
8d65af78 | 2061 | return _proc_do_string(table->data, table->maxlen, write, |
f5dd3d6f SV |
2062 | buffer, lenp, ppos); |
2063 | } | |
2064 | ||
00b7c339 AW |
2065 | static size_t proc_skip_spaces(char **buf) |
2066 | { | |
2067 | size_t ret; | |
2068 | char *tmp = skip_spaces(*buf); | |
2069 | ret = tmp - *buf; | |
2070 | *buf = tmp; | |
2071 | return ret; | |
2072 | } | |
2073 | ||
9f977fb7 OP |
2074 | static void proc_skip_char(char **buf, size_t *size, const char v) |
2075 | { | |
2076 | while (*size) { | |
2077 | if (**buf != v) | |
2078 | break; | |
2079 | (*size)--; | |
2080 | (*buf)++; | |
2081 | } | |
2082 | } | |
2083 | ||
00b7c339 AW |
2084 | #define TMPBUFLEN 22 |
2085 | /** | |
2086 | * proc_get_long - reads an ASCII formated integer from a user buffer | |
2087 | * | |
2088 | * @buf - a kernel buffer | |
2089 | * @size - size of the kernel buffer | |
2090 | * @val - this is where the number will be stored | |
2091 | * @neg - set to %TRUE if number is negative | |
2092 | * @perm_tr - a vector which contains the allowed trailers | |
2093 | * @perm_tr_len - size of the perm_tr vector | |
2094 | * @tr - pointer to store the trailer character | |
2095 | * | |
2096 | * In case of success 0 is returned and buf and size are updated with | |
2097 | * the amount of bytes read. If tr is non NULL and a trailing | |
2098 | * character exist (size is non zero after returning from this | |
2099 | * function) tr is updated with the trailing character. | |
2100 | */ | |
2101 | static int proc_get_long(char **buf, size_t *size, | |
2102 | unsigned long *val, bool *neg, | |
2103 | const char *perm_tr, unsigned perm_tr_len, char *tr) | |
2104 | { | |
2105 | int len; | |
2106 | char *p, tmp[TMPBUFLEN]; | |
2107 | ||
2108 | if (!*size) | |
2109 | return -EINVAL; | |
2110 | ||
2111 | len = *size; | |
2112 | if (len > TMPBUFLEN - 1) | |
2113 | len = TMPBUFLEN - 1; | |
2114 | ||
2115 | memcpy(tmp, *buf, len); | |
2116 | ||
2117 | tmp[len] = 0; | |
2118 | p = tmp; | |
2119 | if (*p == '-' && *size > 1) { | |
2120 | *neg = true; | |
2121 | p++; | |
2122 | } else | |
2123 | *neg = false; | |
2124 | if (!isdigit(*p)) | |
2125 | return -EINVAL; | |
2126 | ||
2127 | *val = simple_strtoul(p, &p, 0); | |
2128 | ||
2129 | len = p - tmp; | |
2130 | ||
2131 | /* We don't know if the next char is whitespace thus we may accept | |
2132 | * invalid integers (e.g. 1234...a) or two integers instead of one | |
2133 | * (e.g. 123...1). So lets not allow such large numbers. */ | |
2134 | if (len == TMPBUFLEN - 1) | |
2135 | return -EINVAL; | |
2136 | ||
2137 | if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len)) | |
2138 | return -EINVAL; | |
1da177e4 | 2139 | |
00b7c339 AW |
2140 | if (tr && (len < *size)) |
2141 | *tr = *p; | |
2142 | ||
2143 | *buf += len; | |
2144 | *size -= len; | |
2145 | ||
2146 | return 0; | |
2147 | } | |
2148 | ||
2149 | /** | |
2150 | * proc_put_long - coverts an integer to a decimal ASCII formated string | |
2151 | * | |
2152 | * @buf - the user buffer | |
2153 | * @size - the size of the user buffer | |
2154 | * @val - the integer to be converted | |
2155 | * @neg - sign of the number, %TRUE for negative | |
2156 | * | |
2157 | * In case of success 0 is returned and buf and size are updated with | |
2158 | * the amount of bytes read. | |
2159 | */ | |
2160 | static int proc_put_long(void __user **buf, size_t *size, unsigned long val, | |
2161 | bool neg) | |
2162 | { | |
2163 | int len; | |
2164 | char tmp[TMPBUFLEN], *p = tmp; | |
2165 | ||
2166 | sprintf(p, "%s%lu", neg ? "-" : "", val); | |
2167 | len = strlen(tmp); | |
2168 | if (len > *size) | |
2169 | len = *size; | |
2170 | if (copy_to_user(*buf, tmp, len)) | |
2171 | return -EFAULT; | |
2172 | *size -= len; | |
2173 | *buf += len; | |
2174 | return 0; | |
2175 | } | |
2176 | #undef TMPBUFLEN | |
2177 | ||
2178 | static int proc_put_char(void __user **buf, size_t *size, char c) | |
2179 | { | |
2180 | if (*size) { | |
2181 | char __user **buffer = (char __user **)buf; | |
2182 | if (put_user(c, *buffer)) | |
2183 | return -EFAULT; | |
2184 | (*size)--, (*buffer)++; | |
2185 | *buf = *buffer; | |
2186 | } | |
2187 | return 0; | |
2188 | } | |
1da177e4 | 2189 | |
00b7c339 | 2190 | static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp, |
1da177e4 LT |
2191 | int *valp, |
2192 | int write, void *data) | |
2193 | { | |
2194 | if (write) { | |
2195 | *valp = *negp ? -*lvalp : *lvalp; | |
2196 | } else { | |
2197 | int val = *valp; | |
2198 | if (val < 0) { | |
00b7c339 | 2199 | *negp = true; |
1da177e4 LT |
2200 | *lvalp = (unsigned long)-val; |
2201 | } else { | |
00b7c339 | 2202 | *negp = false; |
1da177e4 LT |
2203 | *lvalp = (unsigned long)val; |
2204 | } | |
2205 | } | |
2206 | return 0; | |
2207 | } | |
2208 | ||
00b7c339 AW |
2209 | static const char proc_wspace_sep[] = { ' ', '\t', '\n' }; |
2210 | ||
d8217f07 | 2211 | static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table, |
8d65af78 | 2212 | int write, void __user *buffer, |
fcfbd547 | 2213 | size_t *lenp, loff_t *ppos, |
00b7c339 | 2214 | int (*conv)(bool *negp, unsigned long *lvalp, int *valp, |
1da177e4 LT |
2215 | int write, void *data), |
2216 | void *data) | |
2217 | { | |
00b7c339 AW |
2218 | int *i, vleft, first = 1, err = 0; |
2219 | unsigned long page = 0; | |
2220 | size_t left; | |
2221 | char *kbuf; | |
1da177e4 | 2222 | |
00b7c339 | 2223 | if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) { |
1da177e4 LT |
2224 | *lenp = 0; |
2225 | return 0; | |
2226 | } | |
2227 | ||
fcfbd547 | 2228 | i = (int *) tbl_data; |
1da177e4 LT |
2229 | vleft = table->maxlen / sizeof(*i); |
2230 | left = *lenp; | |
2231 | ||
2232 | if (!conv) | |
2233 | conv = do_proc_dointvec_conv; | |
2234 | ||
00b7c339 AW |
2235 | if (write) { |
2236 | if (left > PAGE_SIZE - 1) | |
2237 | left = PAGE_SIZE - 1; | |
2238 | page = __get_free_page(GFP_TEMPORARY); | |
2239 | kbuf = (char *) page; | |
2240 | if (!kbuf) | |
2241 | return -ENOMEM; | |
2242 | if (copy_from_user(kbuf, buffer, left)) { | |
2243 | err = -EFAULT; | |
2244 | goto free; | |
2245 | } | |
2246 | kbuf[left] = 0; | |
2247 | } | |
2248 | ||
1da177e4 | 2249 | for (; left && vleft--; i++, first=0) { |
00b7c339 AW |
2250 | unsigned long lval; |
2251 | bool neg; | |
1da177e4 | 2252 | |
00b7c339 AW |
2253 | if (write) { |
2254 | left -= proc_skip_spaces(&kbuf); | |
1da177e4 | 2255 | |
00b7c339 AW |
2256 | err = proc_get_long(&kbuf, &left, &lval, &neg, |
2257 | proc_wspace_sep, | |
2258 | sizeof(proc_wspace_sep), NULL); | |
2259 | if (err) | |
1da177e4 | 2260 | break; |
00b7c339 AW |
2261 | if (conv(&neg, &lval, i, 1, data)) { |
2262 | err = -EINVAL; | |
1da177e4 | 2263 | break; |
00b7c339 | 2264 | } |
1da177e4 | 2265 | } else { |
00b7c339 AW |
2266 | if (conv(&neg, &lval, i, 0, data)) { |
2267 | err = -EINVAL; | |
2268 | break; | |
2269 | } | |
1da177e4 | 2270 | if (!first) |
00b7c339 AW |
2271 | err = proc_put_char(&buffer, &left, '\t'); |
2272 | if (err) | |
2273 | break; | |
2274 | err = proc_put_long(&buffer, &left, lval, neg); | |
2275 | if (err) | |
1da177e4 | 2276 | break; |
1da177e4 LT |
2277 | } |
2278 | } | |
2279 | ||
00b7c339 AW |
2280 | if (!write && !first && left && !err) |
2281 | err = proc_put_char(&buffer, &left, '\n'); | |
2282 | if (write && !err) | |
2283 | left -= proc_skip_spaces(&kbuf); | |
2284 | free: | |
1da177e4 | 2285 | if (write) { |
00b7c339 AW |
2286 | free_page(page); |
2287 | if (first) | |
2288 | return err ? : -EINVAL; | |
1da177e4 | 2289 | } |
1da177e4 LT |
2290 | *lenp -= left; |
2291 | *ppos += *lenp; | |
00b7c339 | 2292 | return err; |
1da177e4 LT |
2293 | } |
2294 | ||
8d65af78 | 2295 | static int do_proc_dointvec(struct ctl_table *table, int write, |
fcfbd547 | 2296 | void __user *buffer, size_t *lenp, loff_t *ppos, |
00b7c339 | 2297 | int (*conv)(bool *negp, unsigned long *lvalp, int *valp, |
fcfbd547 KK |
2298 | int write, void *data), |
2299 | void *data) | |
2300 | { | |
8d65af78 | 2301 | return __do_proc_dointvec(table->data, table, write, |
fcfbd547 KK |
2302 | buffer, lenp, ppos, conv, data); |
2303 | } | |
2304 | ||
1da177e4 LT |
2305 | /** |
2306 | * proc_dointvec - read a vector of integers | |
2307 | * @table: the sysctl table | |
2308 | * @write: %TRUE if this is a write to the sysctl file | |
1da177e4 LT |
2309 | * @buffer: the user buffer |
2310 | * @lenp: the size of the user buffer | |
2311 | * @ppos: file position | |
2312 | * | |
2313 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer | |
2314 | * values from/to the user buffer, treated as an ASCII string. | |
2315 | * | |
2316 | * Returns 0 on success. | |
2317 | */ | |
8d65af78 | 2318 | int proc_dointvec(struct ctl_table *table, int write, |
1da177e4 LT |
2319 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2320 | { | |
8d65af78 | 2321 | return do_proc_dointvec(table,write,buffer,lenp,ppos, |
1da177e4 LT |
2322 | NULL,NULL); |
2323 | } | |
2324 | ||
34f5a398 | 2325 | /* |
25ddbb18 AK |
2326 | * Taint values can only be increased |
2327 | * This means we can safely use a temporary. | |
34f5a398 | 2328 | */ |
8d65af78 | 2329 | static int proc_taint(struct ctl_table *table, int write, |
34f5a398 TT |
2330 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2331 | { | |
25ddbb18 AK |
2332 | struct ctl_table t; |
2333 | unsigned long tmptaint = get_taint(); | |
2334 | int err; | |
34f5a398 | 2335 | |
91fcd412 | 2336 | if (write && !capable(CAP_SYS_ADMIN)) |
34f5a398 TT |
2337 | return -EPERM; |
2338 | ||
25ddbb18 AK |
2339 | t = *table; |
2340 | t.data = &tmptaint; | |
8d65af78 | 2341 | err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos); |
25ddbb18 AK |
2342 | if (err < 0) |
2343 | return err; | |
2344 | ||
2345 | if (write) { | |
2346 | /* | |
2347 | * Poor man's atomic or. Not worth adding a primitive | |
2348 | * to everyone's atomic.h for this | |
2349 | */ | |
2350 | int i; | |
2351 | for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) { | |
2352 | if ((tmptaint >> i) & 1) | |
2353 | add_taint(i); | |
2354 | } | |
2355 | } | |
2356 | ||
2357 | return err; | |
34f5a398 TT |
2358 | } |
2359 | ||
1da177e4 LT |
2360 | struct do_proc_dointvec_minmax_conv_param { |
2361 | int *min; | |
2362 | int *max; | |
2363 | }; | |
2364 | ||
00b7c339 AW |
2365 | static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp, |
2366 | int *valp, | |
1da177e4 LT |
2367 | int write, void *data) |
2368 | { | |
2369 | struct do_proc_dointvec_minmax_conv_param *param = data; | |
2370 | if (write) { | |
2371 | int val = *negp ? -*lvalp : *lvalp; | |
2372 | if ((param->min && *param->min > val) || | |
2373 | (param->max && *param->max < val)) | |
2374 | return -EINVAL; | |
2375 | *valp = val; | |
2376 | } else { | |
2377 | int val = *valp; | |
2378 | if (val < 0) { | |
00b7c339 | 2379 | *negp = true; |
1da177e4 LT |
2380 | *lvalp = (unsigned long)-val; |
2381 | } else { | |
00b7c339 | 2382 | *negp = false; |
1da177e4 LT |
2383 | *lvalp = (unsigned long)val; |
2384 | } | |
2385 | } | |
2386 | return 0; | |
2387 | } | |
2388 | ||
2389 | /** | |
2390 | * proc_dointvec_minmax - read a vector of integers with min/max values | |
2391 | * @table: the sysctl table | |
2392 | * @write: %TRUE if this is a write to the sysctl file | |
1da177e4 LT |
2393 | * @buffer: the user buffer |
2394 | * @lenp: the size of the user buffer | |
2395 | * @ppos: file position | |
2396 | * | |
2397 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer | |
2398 | * values from/to the user buffer, treated as an ASCII string. | |
2399 | * | |
2400 | * This routine will ensure the values are within the range specified by | |
2401 | * table->extra1 (min) and table->extra2 (max). | |
2402 | * | |
2403 | * Returns 0 on success. | |
2404 | */ | |
8d65af78 | 2405 | int proc_dointvec_minmax(struct ctl_table *table, int write, |
1da177e4 LT |
2406 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2407 | { | |
2408 | struct do_proc_dointvec_minmax_conv_param param = { | |
2409 | .min = (int *) table->extra1, | |
2410 | .max = (int *) table->extra2, | |
2411 | }; | |
8d65af78 | 2412 | return do_proc_dointvec(table, write, buffer, lenp, ppos, |
1da177e4 LT |
2413 | do_proc_dointvec_minmax_conv, ¶m); |
2414 | } | |
2415 | ||
d8217f07 | 2416 | static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write, |
1da177e4 LT |
2417 | void __user *buffer, |
2418 | size_t *lenp, loff_t *ppos, | |
2419 | unsigned long convmul, | |
2420 | unsigned long convdiv) | |
2421 | { | |
00b7c339 AW |
2422 | unsigned long *i, *min, *max; |
2423 | int vleft, first = 1, err = 0; | |
2424 | unsigned long page = 0; | |
2425 | size_t left; | |
2426 | char *kbuf; | |
2427 | ||
2428 | if (!data || !table->maxlen || !*lenp || (*ppos && !write)) { | |
1da177e4 LT |
2429 | *lenp = 0; |
2430 | return 0; | |
2431 | } | |
00b7c339 | 2432 | |
fcfbd547 | 2433 | i = (unsigned long *) data; |
1da177e4 LT |
2434 | min = (unsigned long *) table->extra1; |
2435 | max = (unsigned long *) table->extra2; | |
2436 | vleft = table->maxlen / sizeof(unsigned long); | |
2437 | left = *lenp; | |
00b7c339 AW |
2438 | |
2439 | if (write) { | |
2440 | if (left > PAGE_SIZE - 1) | |
2441 | left = PAGE_SIZE - 1; | |
2442 | page = __get_free_page(GFP_TEMPORARY); | |
2443 | kbuf = (char *) page; | |
2444 | if (!kbuf) | |
2445 | return -ENOMEM; | |
2446 | if (copy_from_user(kbuf, buffer, left)) { | |
2447 | err = -EFAULT; | |
2448 | goto free; | |
2449 | } | |
2450 | kbuf[left] = 0; | |
2451 | } | |
2452 | ||
1da177e4 | 2453 | for (; left && vleft--; i++, min++, max++, first=0) { |
00b7c339 AW |
2454 | unsigned long val; |
2455 | ||
1da177e4 | 2456 | if (write) { |
00b7c339 AW |
2457 | bool neg; |
2458 | ||
2459 | left -= proc_skip_spaces(&kbuf); | |
2460 | ||
2461 | err = proc_get_long(&kbuf, &left, &val, &neg, | |
2462 | proc_wspace_sep, | |
2463 | sizeof(proc_wspace_sep), NULL); | |
2464 | if (err) | |
1da177e4 LT |
2465 | break; |
2466 | if (neg) | |
1da177e4 LT |
2467 | continue; |
2468 | if ((min && val < *min) || (max && val > *max)) | |
2469 | continue; | |
2470 | *i = val; | |
2471 | } else { | |
00b7c339 | 2472 | val = convdiv * (*i) / convmul; |
1da177e4 | 2473 | if (!first) |
00b7c339 AW |
2474 | err = proc_put_char(&buffer, &left, '\t'); |
2475 | err = proc_put_long(&buffer, &left, val, false); | |
2476 | if (err) | |
2477 | break; | |
1da177e4 LT |
2478 | } |
2479 | } | |
2480 | ||
00b7c339 AW |
2481 | if (!write && !first && left && !err) |
2482 | err = proc_put_char(&buffer, &left, '\n'); | |
2483 | if (write && !err) | |
2484 | left -= proc_skip_spaces(&kbuf); | |
2485 | free: | |
1da177e4 | 2486 | if (write) { |
00b7c339 AW |
2487 | free_page(page); |
2488 | if (first) | |
2489 | return err ? : -EINVAL; | |
1da177e4 | 2490 | } |
1da177e4 LT |
2491 | *lenp -= left; |
2492 | *ppos += *lenp; | |
00b7c339 | 2493 | return err; |
1da177e4 LT |
2494 | } |
2495 | ||
d8217f07 | 2496 | static int do_proc_doulongvec_minmax(struct ctl_table *table, int write, |
fcfbd547 KK |
2497 | void __user *buffer, |
2498 | size_t *lenp, loff_t *ppos, | |
2499 | unsigned long convmul, | |
2500 | unsigned long convdiv) | |
2501 | { | |
2502 | return __do_proc_doulongvec_minmax(table->data, table, write, | |
8d65af78 | 2503 | buffer, lenp, ppos, convmul, convdiv); |
fcfbd547 KK |
2504 | } |
2505 | ||
1da177e4 LT |
2506 | /** |
2507 | * proc_doulongvec_minmax - read a vector of long integers with min/max values | |
2508 | * @table: the sysctl table | |
2509 | * @write: %TRUE if this is a write to the sysctl file | |
1da177e4 LT |
2510 | * @buffer: the user buffer |
2511 | * @lenp: the size of the user buffer | |
2512 | * @ppos: file position | |
2513 | * | |
2514 | * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long | |
2515 | * values from/to the user buffer, treated as an ASCII string. | |
2516 | * | |
2517 | * This routine will ensure the values are within the range specified by | |
2518 | * table->extra1 (min) and table->extra2 (max). | |
2519 | * | |
2520 | * Returns 0 on success. | |
2521 | */ | |
8d65af78 | 2522 | int proc_doulongvec_minmax(struct ctl_table *table, int write, |
1da177e4 LT |
2523 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2524 | { | |
8d65af78 | 2525 | return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l); |
1da177e4 LT |
2526 | } |
2527 | ||
2528 | /** | |
2529 | * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values | |
2530 | * @table: the sysctl table | |
2531 | * @write: %TRUE if this is a write to the sysctl file | |
1da177e4 LT |
2532 | * @buffer: the user buffer |
2533 | * @lenp: the size of the user buffer | |
2534 | * @ppos: file position | |
2535 | * | |
2536 | * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long | |
2537 | * values from/to the user buffer, treated as an ASCII string. The values | |
2538 | * are treated as milliseconds, and converted to jiffies when they are stored. | |
2539 | * | |
2540 | * This routine will ensure the values are within the range specified by | |
2541 | * table->extra1 (min) and table->extra2 (max). | |
2542 | * | |
2543 | * Returns 0 on success. | |
2544 | */ | |
d8217f07 | 2545 | int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, |
1da177e4 LT |
2546 | void __user *buffer, |
2547 | size_t *lenp, loff_t *ppos) | |
2548 | { | |
8d65af78 | 2549 | return do_proc_doulongvec_minmax(table, write, buffer, |
1da177e4 LT |
2550 | lenp, ppos, HZ, 1000l); |
2551 | } | |
2552 | ||
2553 | ||
00b7c339 | 2554 | static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp, |
1da177e4 LT |
2555 | int *valp, |
2556 | int write, void *data) | |
2557 | { | |
2558 | if (write) { | |
cba9f33d BS |
2559 | if (*lvalp > LONG_MAX / HZ) |
2560 | return 1; | |
1da177e4 LT |
2561 | *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ); |
2562 | } else { | |
2563 | int val = *valp; | |
2564 | unsigned long lval; | |
2565 | if (val < 0) { | |
00b7c339 | 2566 | *negp = true; |
1da177e4 LT |
2567 | lval = (unsigned long)-val; |
2568 | } else { | |
00b7c339 | 2569 | *negp = false; |
1da177e4 LT |
2570 | lval = (unsigned long)val; |
2571 | } | |
2572 | *lvalp = lval / HZ; | |
2573 | } | |
2574 | return 0; | |
2575 | } | |
2576 | ||
00b7c339 | 2577 | static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp, |
1da177e4 LT |
2578 | int *valp, |
2579 | int write, void *data) | |
2580 | { | |
2581 | if (write) { | |
cba9f33d BS |
2582 | if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ) |
2583 | return 1; | |
1da177e4 LT |
2584 | *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp); |
2585 | } else { | |
2586 | int val = *valp; | |
2587 | unsigned long lval; | |
2588 | if (val < 0) { | |
00b7c339 | 2589 | *negp = true; |
1da177e4 LT |
2590 | lval = (unsigned long)-val; |
2591 | } else { | |
00b7c339 | 2592 | *negp = false; |
1da177e4 LT |
2593 | lval = (unsigned long)val; |
2594 | } | |
2595 | *lvalp = jiffies_to_clock_t(lval); | |
2596 | } | |
2597 | return 0; | |
2598 | } | |
2599 | ||
00b7c339 | 2600 | static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp, |
1da177e4 LT |
2601 | int *valp, |
2602 | int write, void *data) | |
2603 | { | |
2604 | if (write) { | |
2605 | *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp); | |
2606 | } else { | |
2607 | int val = *valp; | |
2608 | unsigned long lval; | |
2609 | if (val < 0) { | |
00b7c339 | 2610 | *negp = true; |
1da177e4 LT |
2611 | lval = (unsigned long)-val; |
2612 | } else { | |
00b7c339 | 2613 | *negp = false; |
1da177e4 LT |
2614 | lval = (unsigned long)val; |
2615 | } | |
2616 | *lvalp = jiffies_to_msecs(lval); | |
2617 | } | |
2618 | return 0; | |
2619 | } | |
2620 | ||
2621 | /** | |
2622 | * proc_dointvec_jiffies - read a vector of integers as seconds | |
2623 | * @table: the sysctl table | |
2624 | * @write: %TRUE if this is a write to the sysctl file | |
1da177e4 LT |
2625 | * @buffer: the user buffer |
2626 | * @lenp: the size of the user buffer | |
2627 | * @ppos: file position | |
2628 | * | |
2629 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer | |
2630 | * values from/to the user buffer, treated as an ASCII string. | |
2631 | * The values read are assumed to be in seconds, and are converted into | |
2632 | * jiffies. | |
2633 | * | |
2634 | * Returns 0 on success. | |
2635 | */ | |
8d65af78 | 2636 | int proc_dointvec_jiffies(struct ctl_table *table, int write, |
1da177e4 LT |
2637 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2638 | { | |
8d65af78 | 2639 | return do_proc_dointvec(table,write,buffer,lenp,ppos, |
1da177e4 LT |
2640 | do_proc_dointvec_jiffies_conv,NULL); |
2641 | } | |
2642 | ||
2643 | /** | |
2644 | * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds | |
2645 | * @table: the sysctl table | |
2646 | * @write: %TRUE if this is a write to the sysctl file | |
1da177e4 LT |
2647 | * @buffer: the user buffer |
2648 | * @lenp: the size of the user buffer | |
1e5d5331 | 2649 | * @ppos: pointer to the file position |
1da177e4 LT |
2650 | * |
2651 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer | |
2652 | * values from/to the user buffer, treated as an ASCII string. | |
2653 | * The values read are assumed to be in 1/USER_HZ seconds, and | |
2654 | * are converted into jiffies. | |
2655 | * | |
2656 | * Returns 0 on success. | |
2657 | */ | |
8d65af78 | 2658 | int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, |
1da177e4 LT |
2659 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2660 | { | |
8d65af78 | 2661 | return do_proc_dointvec(table,write,buffer,lenp,ppos, |
1da177e4 LT |
2662 | do_proc_dointvec_userhz_jiffies_conv,NULL); |
2663 | } | |
2664 | ||
2665 | /** | |
2666 | * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds | |
2667 | * @table: the sysctl table | |
2668 | * @write: %TRUE if this is a write to the sysctl file | |
1da177e4 LT |
2669 | * @buffer: the user buffer |
2670 | * @lenp: the size of the user buffer | |
67be2dd1 MW |
2671 | * @ppos: file position |
2672 | * @ppos: the current position in the file | |
1da177e4 LT |
2673 | * |
2674 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer | |
2675 | * values from/to the user buffer, treated as an ASCII string. | |
2676 | * The values read are assumed to be in 1/1000 seconds, and | |
2677 | * are converted into jiffies. | |
2678 | * | |
2679 | * Returns 0 on success. | |
2680 | */ | |
8d65af78 | 2681 | int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, |
1da177e4 LT |
2682 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2683 | { | |
8d65af78 | 2684 | return do_proc_dointvec(table, write, buffer, lenp, ppos, |
1da177e4 LT |
2685 | do_proc_dointvec_ms_jiffies_conv, NULL); |
2686 | } | |
2687 | ||
8d65af78 | 2688 | static int proc_do_cad_pid(struct ctl_table *table, int write, |
9ec52099 CLG |
2689 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2690 | { | |
2691 | struct pid *new_pid; | |
2692 | pid_t tmp; | |
2693 | int r; | |
2694 | ||
6c5f3e7b | 2695 | tmp = pid_vnr(cad_pid); |
9ec52099 | 2696 | |
8d65af78 | 2697 | r = __do_proc_dointvec(&tmp, table, write, buffer, |
9ec52099 CLG |
2698 | lenp, ppos, NULL, NULL); |
2699 | if (r || !write) | |
2700 | return r; | |
2701 | ||
2702 | new_pid = find_get_pid(tmp); | |
2703 | if (!new_pid) | |
2704 | return -ESRCH; | |
2705 | ||
2706 | put_pid(xchg(&cad_pid, new_pid)); | |
2707 | return 0; | |
2708 | } | |
2709 | ||
9f977fb7 OP |
2710 | /** |
2711 | * proc_do_large_bitmap - read/write from/to a large bitmap | |
2712 | * @table: the sysctl table | |
2713 | * @write: %TRUE if this is a write to the sysctl file | |
2714 | * @buffer: the user buffer | |
2715 | * @lenp: the size of the user buffer | |
2716 | * @ppos: file position | |
2717 | * | |
2718 | * The bitmap is stored at table->data and the bitmap length (in bits) | |
2719 | * in table->maxlen. | |
2720 | * | |
2721 | * We use a range comma separated format (e.g. 1,3-4,10-10) so that | |
2722 | * large bitmaps may be represented in a compact manner. Writing into | |
2723 | * the file will clear the bitmap then update it with the given input. | |
2724 | * | |
2725 | * Returns 0 on success. | |
2726 | */ | |
2727 | int proc_do_large_bitmap(struct ctl_table *table, int write, | |
2728 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2729 | { | |
2730 | int err = 0; | |
2731 | bool first = 1; | |
2732 | size_t left = *lenp; | |
2733 | unsigned long bitmap_len = table->maxlen; | |
2734 | unsigned long *bitmap = (unsigned long *) table->data; | |
2735 | unsigned long *tmp_bitmap = NULL; | |
2736 | char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c; | |
2737 | ||
2738 | if (!bitmap_len || !left || (*ppos && !write)) { | |
2739 | *lenp = 0; | |
2740 | return 0; | |
2741 | } | |
2742 | ||
2743 | if (write) { | |
2744 | unsigned long page = 0; | |
2745 | char *kbuf; | |
2746 | ||
2747 | if (left > PAGE_SIZE - 1) | |
2748 | left = PAGE_SIZE - 1; | |
2749 | ||
2750 | page = __get_free_page(GFP_TEMPORARY); | |
2751 | kbuf = (char *) page; | |
2752 | if (!kbuf) | |
2753 | return -ENOMEM; | |
2754 | if (copy_from_user(kbuf, buffer, left)) { | |
2755 | free_page(page); | |
2756 | return -EFAULT; | |
2757 | } | |
2758 | kbuf[left] = 0; | |
2759 | ||
2760 | tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long), | |
2761 | GFP_KERNEL); | |
2762 | if (!tmp_bitmap) { | |
2763 | free_page(page); | |
2764 | return -ENOMEM; | |
2765 | } | |
2766 | proc_skip_char(&kbuf, &left, '\n'); | |
2767 | while (!err && left) { | |
2768 | unsigned long val_a, val_b; | |
2769 | bool neg; | |
2770 | ||
2771 | err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a, | |
2772 | sizeof(tr_a), &c); | |
2773 | if (err) | |
2774 | break; | |
2775 | if (val_a >= bitmap_len || neg) { | |
2776 | err = -EINVAL; | |
2777 | break; | |
2778 | } | |
2779 | ||
2780 | val_b = val_a; | |
2781 | if (left) { | |
2782 | kbuf++; | |
2783 | left--; | |
2784 | } | |
2785 | ||
2786 | if (c == '-') { | |
2787 | err = proc_get_long(&kbuf, &left, &val_b, | |
2788 | &neg, tr_b, sizeof(tr_b), | |
2789 | &c); | |
2790 | if (err) | |
2791 | break; | |
2792 | if (val_b >= bitmap_len || neg || | |
2793 | val_a > val_b) { | |
2794 | err = -EINVAL; | |
2795 | break; | |
2796 | } | |
2797 | if (left) { | |
2798 | kbuf++; | |
2799 | left--; | |
2800 | } | |
2801 | } | |
2802 | ||
2803 | while (val_a <= val_b) | |
2804 | set_bit(val_a++, tmp_bitmap); | |
2805 | ||
2806 | first = 0; | |
2807 | proc_skip_char(&kbuf, &left, '\n'); | |
2808 | } | |
2809 | free_page(page); | |
2810 | } else { | |
2811 | unsigned long bit_a, bit_b = 0; | |
2812 | ||
2813 | while (left) { | |
2814 | bit_a = find_next_bit(bitmap, bitmap_len, bit_b); | |
2815 | if (bit_a >= bitmap_len) | |
2816 | break; | |
2817 | bit_b = find_next_zero_bit(bitmap, bitmap_len, | |
2818 | bit_a + 1) - 1; | |
2819 | ||
2820 | if (!first) { | |
2821 | err = proc_put_char(&buffer, &left, ','); | |
2822 | if (err) | |
2823 | break; | |
2824 | } | |
2825 | err = proc_put_long(&buffer, &left, bit_a, false); | |
2826 | if (err) | |
2827 | break; | |
2828 | if (bit_a != bit_b) { | |
2829 | err = proc_put_char(&buffer, &left, '-'); | |
2830 | if (err) | |
2831 | break; | |
2832 | err = proc_put_long(&buffer, &left, bit_b, false); | |
2833 | if (err) | |
2834 | break; | |
2835 | } | |
2836 | ||
2837 | first = 0; bit_b++; | |
2838 | } | |
2839 | if (!err) | |
2840 | err = proc_put_char(&buffer, &left, '\n'); | |
2841 | } | |
2842 | ||
2843 | if (!err) { | |
2844 | if (write) { | |
2845 | if (*ppos) | |
2846 | bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len); | |
2847 | else | |
2848 | memcpy(bitmap, tmp_bitmap, | |
2849 | BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long)); | |
2850 | } | |
2851 | kfree(tmp_bitmap); | |
2852 | *lenp -= left; | |
2853 | *ppos += *lenp; | |
2854 | return 0; | |
2855 | } else { | |
2856 | kfree(tmp_bitmap); | |
2857 | return err; | |
2858 | } | |
2859 | } | |
2860 | ||
1da177e4 LT |
2861 | #else /* CONFIG_PROC_FS */ |
2862 | ||
8d65af78 | 2863 | int proc_dostring(struct ctl_table *table, int write, |
1da177e4 LT |
2864 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2865 | { | |
2866 | return -ENOSYS; | |
2867 | } | |
2868 | ||
8d65af78 | 2869 | int proc_dointvec(struct ctl_table *table, int write, |
1da177e4 | 2870 | void __user *buffer, size_t *lenp, loff_t *ppos) |
1da177e4 LT |
2871 | { |
2872 | return -ENOSYS; | |
2873 | } | |
2874 | ||
8d65af78 | 2875 | int proc_dointvec_minmax(struct ctl_table *table, int write, |
1da177e4 LT |
2876 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2877 | { | |
2878 | return -ENOSYS; | |
2879 | } | |
2880 | ||
8d65af78 | 2881 | int proc_dointvec_jiffies(struct ctl_table *table, int write, |
1da177e4 LT |
2882 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2883 | { | |
2884 | return -ENOSYS; | |
2885 | } | |
2886 | ||
8d65af78 | 2887 | int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, |
1da177e4 LT |
2888 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2889 | { | |
2890 | return -ENOSYS; | |
2891 | } | |
2892 | ||
8d65af78 | 2893 | int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, |
1da177e4 LT |
2894 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2895 | { | |
2896 | return -ENOSYS; | |
2897 | } | |
2898 | ||
8d65af78 | 2899 | int proc_doulongvec_minmax(struct ctl_table *table, int write, |
1da177e4 LT |
2900 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2901 | { | |
2902 | return -ENOSYS; | |
2903 | } | |
2904 | ||
d8217f07 | 2905 | int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, |
1da177e4 LT |
2906 | void __user *buffer, |
2907 | size_t *lenp, loff_t *ppos) | |
2908 | { | |
2909 | return -ENOSYS; | |
2910 | } | |
2911 | ||
2912 | ||
2913 | #endif /* CONFIG_PROC_FS */ | |
2914 | ||
1da177e4 LT |
2915 | /* |
2916 | * No sense putting this after each symbol definition, twice, | |
2917 | * exception granted :-) | |
2918 | */ | |
2919 | EXPORT_SYMBOL(proc_dointvec); | |
2920 | EXPORT_SYMBOL(proc_dointvec_jiffies); | |
2921 | EXPORT_SYMBOL(proc_dointvec_minmax); | |
2922 | EXPORT_SYMBOL(proc_dointvec_userhz_jiffies); | |
2923 | EXPORT_SYMBOL(proc_dointvec_ms_jiffies); | |
2924 | EXPORT_SYMBOL(proc_dostring); | |
2925 | EXPORT_SYMBOL(proc_doulongvec_minmax); | |
2926 | EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax); | |
2927 | EXPORT_SYMBOL(register_sysctl_table); | |
29e796fd | 2928 | EXPORT_SYMBOL(register_sysctl_paths); |
1da177e4 | 2929 | EXPORT_SYMBOL(unregister_sysctl_table); |