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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * sysctl.c: General linux system control interface | |
3 | * | |
4 | * Begun 24 March 1995, Stephen Tweedie | |
5 | * Added /proc support, Dec 1995 | |
6 | * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas. | |
7 | * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver. | |
8 | * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver. | |
9 | * Dynamic registration fixes, Stephen Tweedie. | |
10 | * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn. | |
11 | * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris | |
12 | * Horn. | |
13 | * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer. | |
14 | * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer. | |
15 | * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill | |
16 | * Wendling. | |
17 | * The list_for_each() macro wasn't appropriate for the sysctl loop. | |
18 | * Removed it and replaced it with older style, 03/23/00, Bill Wendling | |
19 | */ | |
20 | ||
1da177e4 LT |
21 | #include <linux/module.h> |
22 | #include <linux/mm.h> | |
23 | #include <linux/swap.h> | |
24 | #include <linux/slab.h> | |
25 | #include <linux/sysctl.h> | |
d33ed52d | 26 | #include <linux/signal.h> |
455cd5ab | 27 | #include <linux/printk.h> |
1da177e4 | 28 | #include <linux/proc_fs.h> |
72c2d582 | 29 | #include <linux/security.h> |
1da177e4 | 30 | #include <linux/ctype.h> |
dfec072e | 31 | #include <linux/kmemcheck.h> |
62239ac2 | 32 | #include <linux/fs.h> |
1da177e4 LT |
33 | #include <linux/init.h> |
34 | #include <linux/kernel.h> | |
0296b228 | 35 | #include <linux/kobject.h> |
20380731 | 36 | #include <linux/net.h> |
1da177e4 LT |
37 | #include <linux/sysrq.h> |
38 | #include <linux/highuid.h> | |
39 | #include <linux/writeback.h> | |
3fff4c42 | 40 | #include <linux/ratelimit.h> |
76ab0f53 | 41 | #include <linux/compaction.h> |
1da177e4 | 42 | #include <linux/hugetlb.h> |
1da177e4 | 43 | #include <linux/initrd.h> |
0b77f5bf | 44 | #include <linux/key.h> |
1da177e4 LT |
45 | #include <linux/times.h> |
46 | #include <linux/limits.h> | |
47 | #include <linux/dcache.h> | |
6e006701 | 48 | #include <linux/dnotify.h> |
1da177e4 | 49 | #include <linux/syscalls.h> |
c748e134 | 50 | #include <linux/vmstat.h> |
c255d844 PM |
51 | #include <linux/nfs_fs.h> |
52 | #include <linux/acpi.h> | |
10a0a8d4 | 53 | #include <linux/reboot.h> |
b0fc494f | 54 | #include <linux/ftrace.h> |
cdd6c482 | 55 | #include <linux/perf_event.h> |
b2be84df | 56 | #include <linux/kprobes.h> |
b492e95b | 57 | #include <linux/pipe_fs_i.h> |
8e4228e1 | 58 | #include <linux/oom.h> |
17f60a7d | 59 | #include <linux/kmod.h> |
1da177e4 LT |
60 | |
61 | #include <asm/uaccess.h> | |
62 | #include <asm/processor.h> | |
63 | ||
29cbc78b AK |
64 | #ifdef CONFIG_X86 |
65 | #include <asm/nmi.h> | |
0741f4d2 | 66 | #include <asm/stacktrace.h> |
6e7c4025 | 67 | #include <asm/io.h> |
29cbc78b | 68 | #endif |
c55b7c3e DY |
69 | #ifdef CONFIG_BSD_PROCESS_ACCT |
70 | #include <linux/acct.h> | |
71 | #endif | |
4f0e056f DY |
72 | #ifdef CONFIG_RT_MUTEXES |
73 | #include <linux/rtmutex.h> | |
74 | #endif | |
2edf5e49 DY |
75 | #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT) |
76 | #include <linux/lockdep.h> | |
77 | #endif | |
15485a46 DY |
78 | #ifdef CONFIG_CHR_DEV_SG |
79 | #include <scsi/sg.h> | |
80 | #endif | |
29cbc78b | 81 | |
58687acb | 82 | #ifdef CONFIG_LOCKUP_DETECTOR |
504d7cf1 DZ |
83 | #include <linux/nmi.h> |
84 | #endif | |
85 | ||
7058cb02 | 86 | |
1da177e4 LT |
87 | #if defined(CONFIG_SYSCTL) |
88 | ||
89 | /* External variables not in a header file. */ | |
1da177e4 LT |
90 | extern int sysctl_overcommit_memory; |
91 | extern int sysctl_overcommit_ratio; | |
92 | extern int max_threads; | |
1da177e4 | 93 | extern int core_uses_pid; |
d6e71144 | 94 | extern int suid_dumpable; |
1da177e4 | 95 | extern char core_pattern[]; |
a293980c | 96 | extern unsigned int core_pipe_limit; |
1da177e4 LT |
97 | extern int pid_max; |
98 | extern int min_free_kbytes; | |
1da177e4 | 99 | extern int pid_max_min, pid_max_max; |
9d0243bc | 100 | extern int sysctl_drop_caches; |
8ad4b1fb | 101 | extern int percpu_pagelist_fraction; |
bebfa101 | 102 | extern int compat_log; |
9745512c | 103 | extern int latencytop_enabled; |
eceea0b3 | 104 | extern int sysctl_nr_open_min, sysctl_nr_open_max; |
dd8632a1 PM |
105 | #ifndef CONFIG_MMU |
106 | extern int sysctl_nr_trim_pages; | |
107 | #endif | |
cb684b5b | 108 | #ifdef CONFIG_BLOCK |
5e605b64 | 109 | extern int blk_iopoll_enabled; |
cb684b5b | 110 | #endif |
1da177e4 | 111 | |
c4f3b63f | 112 | /* Constants used for minimum and maximum */ |
2508ce18 | 113 | #ifdef CONFIG_LOCKUP_DETECTOR |
c4f3b63f | 114 | static int sixty = 60; |
9383d967 | 115 | static int neg_one = -1; |
c4f3b63f RT |
116 | #endif |
117 | ||
c4f3b63f | 118 | static int zero; |
cd5f9a4c LT |
119 | static int __maybe_unused one = 1; |
120 | static int __maybe_unused two = 2; | |
cb16e95f | 121 | static int __maybe_unused three = 3; |
fc3501d4 | 122 | static unsigned long one_ul = 1; |
c4f3b63f | 123 | static int one_hundred = 100; |
af91322e DY |
124 | #ifdef CONFIG_PRINTK |
125 | static int ten_thousand = 10000; | |
126 | #endif | |
c4f3b63f | 127 | |
9e4a5bda AR |
128 | /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */ |
129 | static unsigned long dirty_bytes_min = 2 * PAGE_SIZE; | |
130 | ||
1da177e4 LT |
131 | /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */ |
132 | static int maxolduid = 65535; | |
133 | static int minolduid; | |
8ad4b1fb | 134 | static int min_percpu_pagelist_fract = 8; |
1da177e4 LT |
135 | |
136 | static int ngroups_max = NGROUPS_MAX; | |
137 | ||
d14f1729 DY |
138 | #ifdef CONFIG_INOTIFY_USER |
139 | #include <linux/inotify.h> | |
140 | #endif | |
72c57ed5 | 141 | #ifdef CONFIG_SPARC |
17f04fbb | 142 | #include <asm/system.h> |
1da177e4 LT |
143 | #endif |
144 | ||
0871420f DM |
145 | #ifdef CONFIG_SPARC64 |
146 | extern int sysctl_tsb_ratio; | |
147 | #endif | |
148 | ||
1da177e4 LT |
149 | #ifdef __hppa__ |
150 | extern int pwrsw_enabled; | |
151 | extern int unaligned_enabled; | |
152 | #endif | |
153 | ||
347a8dc3 | 154 | #ifdef CONFIG_S390 |
1da177e4 LT |
155 | #ifdef CONFIG_MATHEMU |
156 | extern int sysctl_ieee_emulation_warnings; | |
157 | #endif | |
158 | extern int sysctl_userprocess_debug; | |
951f22d5 | 159 | extern int spin_retry; |
1da177e4 LT |
160 | #endif |
161 | ||
d2b176ed JS |
162 | #ifdef CONFIG_IA64 |
163 | extern int no_unaligned_warning; | |
88fc241f | 164 | extern int unaligned_dump_stack; |
d2b176ed JS |
165 | #endif |
166 | ||
d6f8ff73 | 167 | #ifdef CONFIG_PROC_SYSCTL |
8d65af78 | 168 | static int proc_do_cad_pid(struct ctl_table *table, int write, |
9ec52099 | 169 | void __user *buffer, size_t *lenp, loff_t *ppos); |
8d65af78 | 170 | static int proc_taint(struct ctl_table *table, int write, |
34f5a398 | 171 | void __user *buffer, size_t *lenp, loff_t *ppos); |
d6f8ff73 | 172 | #endif |
9ec52099 | 173 | |
bfdc0b49 RW |
174 | #ifdef CONFIG_PRINTK |
175 | static int proc_dmesg_restrict(struct ctl_table *table, int write, | |
176 | void __user *buffer, size_t *lenp, loff_t *ppos); | |
177 | #endif | |
178 | ||
97f5f0cd | 179 | #ifdef CONFIG_MAGIC_SYSRQ |
8c6a98b2 AW |
180 | /* Note: sysrq code uses it's own private copy */ |
181 | static int __sysrq_enabled = SYSRQ_DEFAULT_ENABLE; | |
97f5f0cd DT |
182 | |
183 | static int sysrq_sysctl_handler(ctl_table *table, int write, | |
184 | void __user *buffer, size_t *lenp, | |
185 | loff_t *ppos) | |
186 | { | |
187 | int error; | |
188 | ||
189 | error = proc_dointvec(table, write, buffer, lenp, ppos); | |
190 | if (error) | |
191 | return error; | |
192 | ||
193 | if (write) | |
194 | sysrq_toggle_support(__sysrq_enabled); | |
195 | ||
196 | return 0; | |
197 | } | |
198 | ||
199 | #endif | |
200 | ||
d8217f07 | 201 | static struct ctl_table root_table[]; |
e51b6ba0 EB |
202 | static struct ctl_table_root sysctl_table_root; |
203 | static struct ctl_table_header root_table_header = { | |
dfef6dcd | 204 | {{.count = 1, |
e51b6ba0 | 205 | .ctl_table = root_table, |
dfef6dcd | 206 | .ctl_entry = LIST_HEAD_INIT(sysctl_table_root.default_set.list),}}, |
e51b6ba0 | 207 | .root = &sysctl_table_root, |
73455092 | 208 | .set = &sysctl_table_root.default_set, |
e51b6ba0 EB |
209 | }; |
210 | static struct ctl_table_root sysctl_table_root = { | |
211 | .root_list = LIST_HEAD_INIT(sysctl_table_root.root_list), | |
73455092 | 212 | .default_set.list = LIST_HEAD_INIT(root_table_header.ctl_entry), |
e51b6ba0 | 213 | }; |
1da177e4 | 214 | |
d8217f07 EB |
215 | static struct ctl_table kern_table[]; |
216 | static struct ctl_table vm_table[]; | |
217 | static struct ctl_table fs_table[]; | |
218 | static struct ctl_table debug_table[]; | |
219 | static struct ctl_table dev_table[]; | |
220 | extern struct ctl_table random_table[]; | |
7ef9964e DL |
221 | #ifdef CONFIG_EPOLL |
222 | extern struct ctl_table epoll_table[]; | |
223 | #endif | |
1da177e4 LT |
224 | |
225 | #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT | |
226 | int sysctl_legacy_va_layout; | |
227 | #endif | |
228 | ||
1da177e4 LT |
229 | /* The default sysctl tables: */ |
230 | ||
d8217f07 | 231 | static struct ctl_table root_table[] = { |
1da177e4 | 232 | { |
1da177e4 LT |
233 | .procname = "kernel", |
234 | .mode = 0555, | |
235 | .child = kern_table, | |
236 | }, | |
237 | { | |
1da177e4 LT |
238 | .procname = "vm", |
239 | .mode = 0555, | |
240 | .child = vm_table, | |
241 | }, | |
1da177e4 | 242 | { |
1da177e4 LT |
243 | .procname = "fs", |
244 | .mode = 0555, | |
245 | .child = fs_table, | |
246 | }, | |
247 | { | |
1da177e4 LT |
248 | .procname = "debug", |
249 | .mode = 0555, | |
250 | .child = debug_table, | |
251 | }, | |
252 | { | |
1da177e4 LT |
253 | .procname = "dev", |
254 | .mode = 0555, | |
255 | .child = dev_table, | |
256 | }, | |
6fce56ec | 257 | { } |
1da177e4 LT |
258 | }; |
259 | ||
77e54a1f | 260 | #ifdef CONFIG_SCHED_DEBUG |
73c4efd2 ED |
261 | static int min_sched_granularity_ns = 100000; /* 100 usecs */ |
262 | static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */ | |
263 | static int min_wakeup_granularity_ns; /* 0 usecs */ | |
264 | static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */ | |
1983a922 CE |
265 | static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE; |
266 | static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1; | |
77e54a1f IM |
267 | #endif |
268 | ||
5e771905 MG |
269 | #ifdef CONFIG_COMPACTION |
270 | static int min_extfrag_threshold; | |
271 | static int max_extfrag_threshold = 1000; | |
272 | #endif | |
273 | ||
d8217f07 | 274 | static struct ctl_table kern_table[] = { |
2bba22c5 | 275 | { |
2bba22c5 MG |
276 | .procname = "sched_child_runs_first", |
277 | .data = &sysctl_sched_child_runs_first, | |
278 | .maxlen = sizeof(unsigned int), | |
279 | .mode = 0644, | |
6d456111 | 280 | .proc_handler = proc_dointvec, |
2bba22c5 | 281 | }, |
77e54a1f IM |
282 | #ifdef CONFIG_SCHED_DEBUG |
283 | { | |
b2be5e96 PZ |
284 | .procname = "sched_min_granularity_ns", |
285 | .data = &sysctl_sched_min_granularity, | |
77e54a1f IM |
286 | .maxlen = sizeof(unsigned int), |
287 | .mode = 0644, | |
702a7c76 | 288 | .proc_handler = sched_proc_update_handler, |
b2be5e96 PZ |
289 | .extra1 = &min_sched_granularity_ns, |
290 | .extra2 = &max_sched_granularity_ns, | |
77e54a1f | 291 | }, |
21805085 | 292 | { |
21805085 PZ |
293 | .procname = "sched_latency_ns", |
294 | .data = &sysctl_sched_latency, | |
295 | .maxlen = sizeof(unsigned int), | |
296 | .mode = 0644, | |
702a7c76 | 297 | .proc_handler = sched_proc_update_handler, |
21805085 PZ |
298 | .extra1 = &min_sched_granularity_ns, |
299 | .extra2 = &max_sched_granularity_ns, | |
300 | }, | |
77e54a1f | 301 | { |
77e54a1f IM |
302 | .procname = "sched_wakeup_granularity_ns", |
303 | .data = &sysctl_sched_wakeup_granularity, | |
304 | .maxlen = sizeof(unsigned int), | |
305 | .mode = 0644, | |
702a7c76 | 306 | .proc_handler = sched_proc_update_handler, |
77e54a1f IM |
307 | .extra1 = &min_wakeup_granularity_ns, |
308 | .extra2 = &max_wakeup_granularity_ns, | |
309 | }, | |
1983a922 | 310 | { |
1983a922 CE |
311 | .procname = "sched_tunable_scaling", |
312 | .data = &sysctl_sched_tunable_scaling, | |
313 | .maxlen = sizeof(enum sched_tunable_scaling), | |
314 | .mode = 0644, | |
702a7c76 | 315 | .proc_handler = sched_proc_update_handler, |
1983a922 CE |
316 | .extra1 = &min_sched_tunable_scaling, |
317 | .extra2 = &max_sched_tunable_scaling, | |
2398f2c6 | 318 | }, |
da84d961 | 319 | { |
da84d961 IM |
320 | .procname = "sched_migration_cost", |
321 | .data = &sysctl_sched_migration_cost, | |
322 | .maxlen = sizeof(unsigned int), | |
323 | .mode = 0644, | |
6d456111 | 324 | .proc_handler = proc_dointvec, |
da84d961 | 325 | }, |
b82d9fdd | 326 | { |
b82d9fdd PZ |
327 | .procname = "sched_nr_migrate", |
328 | .data = &sysctl_sched_nr_migrate, | |
329 | .maxlen = sizeof(unsigned int), | |
fa85ae24 | 330 | .mode = 0644, |
6d456111 | 331 | .proc_handler = proc_dointvec, |
fa85ae24 | 332 | }, |
e9e9250b | 333 | { |
e9e9250b PZ |
334 | .procname = "sched_time_avg", |
335 | .data = &sysctl_sched_time_avg, | |
336 | .maxlen = sizeof(unsigned int), | |
337 | .mode = 0644, | |
6d456111 | 338 | .proc_handler = proc_dointvec, |
e9e9250b | 339 | }, |
a7a4f8a7 PT |
340 | { |
341 | .procname = "sched_shares_window", | |
342 | .data = &sysctl_sched_shares_window, | |
343 | .maxlen = sizeof(unsigned int), | |
344 | .mode = 0644, | |
345 | .proc_handler = proc_dointvec, | |
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 | }, |
5091faa4 MG |
371 | #ifdef CONFIG_SCHED_AUTOGROUP |
372 | { | |
373 | .procname = "sched_autogroup_enabled", | |
374 | .data = &sysctl_sched_autogroup_enabled, | |
375 | .maxlen = sizeof(unsigned int), | |
376 | .mode = 0644, | |
1747b21f | 377 | .proc_handler = proc_dointvec_minmax, |
5091faa4 MG |
378 | .extra1 = &zero, |
379 | .extra2 = &one, | |
380 | }, | |
381 | #endif | |
f20786ff PZ |
382 | #ifdef CONFIG_PROVE_LOCKING |
383 | { | |
f20786ff PZ |
384 | .procname = "prove_locking", |
385 | .data = &prove_locking, | |
386 | .maxlen = sizeof(int), | |
387 | .mode = 0644, | |
6d456111 | 388 | .proc_handler = proc_dointvec, |
f20786ff PZ |
389 | }, |
390 | #endif | |
391 | #ifdef CONFIG_LOCK_STAT | |
392 | { | |
f20786ff PZ |
393 | .procname = "lock_stat", |
394 | .data = &lock_stat, | |
395 | .maxlen = sizeof(int), | |
396 | .mode = 0644, | |
6d456111 | 397 | .proc_handler = proc_dointvec, |
f20786ff | 398 | }, |
77e54a1f | 399 | #endif |
1da177e4 | 400 | { |
1da177e4 LT |
401 | .procname = "panic", |
402 | .data = &panic_timeout, | |
403 | .maxlen = sizeof(int), | |
404 | .mode = 0644, | |
6d456111 | 405 | .proc_handler = proc_dointvec, |
1da177e4 LT |
406 | }, |
407 | { | |
1da177e4 LT |
408 | .procname = "core_uses_pid", |
409 | .data = &core_uses_pid, | |
410 | .maxlen = sizeof(int), | |
411 | .mode = 0644, | |
6d456111 | 412 | .proc_handler = proc_dointvec, |
1da177e4 LT |
413 | }, |
414 | { | |
1da177e4 LT |
415 | .procname = "core_pattern", |
416 | .data = core_pattern, | |
71ce92f3 | 417 | .maxlen = CORENAME_MAX_SIZE, |
1da177e4 | 418 | .mode = 0644, |
6d456111 | 419 | .proc_handler = proc_dostring, |
1da177e4 | 420 | }, |
a293980c | 421 | { |
a293980c NH |
422 | .procname = "core_pipe_limit", |
423 | .data = &core_pipe_limit, | |
424 | .maxlen = sizeof(unsigned int), | |
425 | .mode = 0644, | |
6d456111 | 426 | .proc_handler = proc_dointvec, |
a293980c | 427 | }, |
34f5a398 | 428 | #ifdef CONFIG_PROC_SYSCTL |
1da177e4 | 429 | { |
1da177e4 | 430 | .procname = "tainted", |
25ddbb18 | 431 | .maxlen = sizeof(long), |
34f5a398 | 432 | .mode = 0644, |
6d456111 | 433 | .proc_handler = proc_taint, |
1da177e4 | 434 | }, |
34f5a398 | 435 | #endif |
9745512c AV |
436 | #ifdef CONFIG_LATENCYTOP |
437 | { | |
438 | .procname = "latencytop", | |
439 | .data = &latencytop_enabled, | |
440 | .maxlen = sizeof(int), | |
441 | .mode = 0644, | |
6d456111 | 442 | .proc_handler = proc_dointvec, |
9745512c AV |
443 | }, |
444 | #endif | |
1da177e4 LT |
445 | #ifdef CONFIG_BLK_DEV_INITRD |
446 | { | |
1da177e4 LT |
447 | .procname = "real-root-dev", |
448 | .data = &real_root_dev, | |
449 | .maxlen = sizeof(int), | |
450 | .mode = 0644, | |
6d456111 | 451 | .proc_handler = proc_dointvec, |
1da177e4 LT |
452 | }, |
453 | #endif | |
45807a1d | 454 | { |
45807a1d IM |
455 | .procname = "print-fatal-signals", |
456 | .data = &print_fatal_signals, | |
457 | .maxlen = sizeof(int), | |
458 | .mode = 0644, | |
6d456111 | 459 | .proc_handler = proc_dointvec, |
45807a1d | 460 | }, |
72c57ed5 | 461 | #ifdef CONFIG_SPARC |
1da177e4 | 462 | { |
1da177e4 LT |
463 | .procname = "reboot-cmd", |
464 | .data = reboot_command, | |
465 | .maxlen = 256, | |
466 | .mode = 0644, | |
6d456111 | 467 | .proc_handler = proc_dostring, |
1da177e4 LT |
468 | }, |
469 | { | |
1da177e4 LT |
470 | .procname = "stop-a", |
471 | .data = &stop_a_enabled, | |
472 | .maxlen = sizeof (int), | |
473 | .mode = 0644, | |
6d456111 | 474 | .proc_handler = proc_dointvec, |
1da177e4 LT |
475 | }, |
476 | { | |
1da177e4 LT |
477 | .procname = "scons-poweroff", |
478 | .data = &scons_pwroff, | |
479 | .maxlen = sizeof (int), | |
480 | .mode = 0644, | |
6d456111 | 481 | .proc_handler = proc_dointvec, |
1da177e4 LT |
482 | }, |
483 | #endif | |
0871420f DM |
484 | #ifdef CONFIG_SPARC64 |
485 | { | |
0871420f DM |
486 | .procname = "tsb-ratio", |
487 | .data = &sysctl_tsb_ratio, | |
488 | .maxlen = sizeof (int), | |
489 | .mode = 0644, | |
6d456111 | 490 | .proc_handler = proc_dointvec, |
0871420f DM |
491 | }, |
492 | #endif | |
1da177e4 LT |
493 | #ifdef __hppa__ |
494 | { | |
1da177e4 LT |
495 | .procname = "soft-power", |
496 | .data = &pwrsw_enabled, | |
497 | .maxlen = sizeof (int), | |
498 | .mode = 0644, | |
6d456111 | 499 | .proc_handler = proc_dointvec, |
1da177e4 LT |
500 | }, |
501 | { | |
1da177e4 LT |
502 | .procname = "unaligned-trap", |
503 | .data = &unaligned_enabled, | |
504 | .maxlen = sizeof (int), | |
505 | .mode = 0644, | |
6d456111 | 506 | .proc_handler = proc_dointvec, |
1da177e4 LT |
507 | }, |
508 | #endif | |
509 | { | |
1da177e4 LT |
510 | .procname = "ctrl-alt-del", |
511 | .data = &C_A_D, | |
512 | .maxlen = sizeof(int), | |
513 | .mode = 0644, | |
6d456111 | 514 | .proc_handler = proc_dointvec, |
1da177e4 | 515 | }, |
606576ce | 516 | #ifdef CONFIG_FUNCTION_TRACER |
b0fc494f | 517 | { |
b0fc494f SR |
518 | .procname = "ftrace_enabled", |
519 | .data = &ftrace_enabled, | |
520 | .maxlen = sizeof(int), | |
521 | .mode = 0644, | |
6d456111 | 522 | .proc_handler = ftrace_enable_sysctl, |
b0fc494f SR |
523 | }, |
524 | #endif | |
f38f1d2a SR |
525 | #ifdef CONFIG_STACK_TRACER |
526 | { | |
f38f1d2a SR |
527 | .procname = "stack_tracer_enabled", |
528 | .data = &stack_tracer_enabled, | |
529 | .maxlen = sizeof(int), | |
530 | .mode = 0644, | |
6d456111 | 531 | .proc_handler = stack_trace_sysctl, |
f38f1d2a SR |
532 | }, |
533 | #endif | |
944ac425 SR |
534 | #ifdef CONFIG_TRACING |
535 | { | |
3299b4dd | 536 | .procname = "ftrace_dump_on_oops", |
944ac425 SR |
537 | .data = &ftrace_dump_on_oops, |
538 | .maxlen = sizeof(int), | |
539 | .mode = 0644, | |
6d456111 | 540 | .proc_handler = proc_dointvec, |
944ac425 SR |
541 | }, |
542 | #endif | |
a1ef5adb | 543 | #ifdef CONFIG_MODULES |
1da177e4 | 544 | { |
1da177e4 LT |
545 | .procname = "modprobe", |
546 | .data = &modprobe_path, | |
547 | .maxlen = KMOD_PATH_LEN, | |
548 | .mode = 0644, | |
6d456111 | 549 | .proc_handler = proc_dostring, |
1da177e4 | 550 | }, |
3d43321b | 551 | { |
3d43321b KC |
552 | .procname = "modules_disabled", |
553 | .data = &modules_disabled, | |
554 | .maxlen = sizeof(int), | |
555 | .mode = 0644, | |
556 | /* only handle a transition from default "0" to "1" */ | |
6d456111 | 557 | .proc_handler = proc_dointvec_minmax, |
3d43321b KC |
558 | .extra1 = &one, |
559 | .extra2 = &one, | |
560 | }, | |
1da177e4 | 561 | #endif |
94f17cd7 | 562 | #ifdef CONFIG_HOTPLUG |
1da177e4 | 563 | { |
1da177e4 | 564 | .procname = "hotplug", |
312c004d KS |
565 | .data = &uevent_helper, |
566 | .maxlen = UEVENT_HELPER_PATH_LEN, | |
1da177e4 | 567 | .mode = 0644, |
6d456111 | 568 | .proc_handler = proc_dostring, |
1da177e4 LT |
569 | }, |
570 | #endif | |
571 | #ifdef CONFIG_CHR_DEV_SG | |
572 | { | |
1da177e4 LT |
573 | .procname = "sg-big-buff", |
574 | .data = &sg_big_buff, | |
575 | .maxlen = sizeof (int), | |
576 | .mode = 0444, | |
6d456111 | 577 | .proc_handler = proc_dointvec, |
1da177e4 LT |
578 | }, |
579 | #endif | |
580 | #ifdef CONFIG_BSD_PROCESS_ACCT | |
581 | { | |
1da177e4 LT |
582 | .procname = "acct", |
583 | .data = &acct_parm, | |
584 | .maxlen = 3*sizeof(int), | |
585 | .mode = 0644, | |
6d456111 | 586 | .proc_handler = proc_dointvec, |
1da177e4 LT |
587 | }, |
588 | #endif | |
1da177e4 LT |
589 | #ifdef CONFIG_MAGIC_SYSRQ |
590 | { | |
1da177e4 | 591 | .procname = "sysrq", |
5d6f647f | 592 | .data = &__sysrq_enabled, |
1da177e4 LT |
593 | .maxlen = sizeof (int), |
594 | .mode = 0644, | |
97f5f0cd | 595 | .proc_handler = sysrq_sysctl_handler, |
1da177e4 LT |
596 | }, |
597 | #endif | |
d6f8ff73 | 598 | #ifdef CONFIG_PROC_SYSCTL |
1da177e4 | 599 | { |
1da177e4 | 600 | .procname = "cad_pid", |
9ec52099 | 601 | .data = NULL, |
1da177e4 LT |
602 | .maxlen = sizeof (int), |
603 | .mode = 0600, | |
6d456111 | 604 | .proc_handler = proc_do_cad_pid, |
1da177e4 | 605 | }, |
d6f8ff73 | 606 | #endif |
1da177e4 | 607 | { |
1da177e4 LT |
608 | .procname = "threads-max", |
609 | .data = &max_threads, | |
610 | .maxlen = sizeof(int), | |
611 | .mode = 0644, | |
6d456111 | 612 | .proc_handler = proc_dointvec, |
1da177e4 LT |
613 | }, |
614 | { | |
1da177e4 LT |
615 | .procname = "random", |
616 | .mode = 0555, | |
617 | .child = random_table, | |
618 | }, | |
17f60a7d EP |
619 | { |
620 | .procname = "usermodehelper", | |
621 | .mode = 0555, | |
622 | .child = usermodehelper_table, | |
623 | }, | |
1da177e4 | 624 | { |
1da177e4 LT |
625 | .procname = "overflowuid", |
626 | .data = &overflowuid, | |
627 | .maxlen = sizeof(int), | |
628 | .mode = 0644, | |
6d456111 | 629 | .proc_handler = proc_dointvec_minmax, |
1da177e4 LT |
630 | .extra1 = &minolduid, |
631 | .extra2 = &maxolduid, | |
632 | }, | |
633 | { | |
1da177e4 LT |
634 | .procname = "overflowgid", |
635 | .data = &overflowgid, | |
636 | .maxlen = sizeof(int), | |
637 | .mode = 0644, | |
6d456111 | 638 | .proc_handler = proc_dointvec_minmax, |
1da177e4 LT |
639 | .extra1 = &minolduid, |
640 | .extra2 = &maxolduid, | |
641 | }, | |
347a8dc3 | 642 | #ifdef CONFIG_S390 |
1da177e4 LT |
643 | #ifdef CONFIG_MATHEMU |
644 | { | |
1da177e4 LT |
645 | .procname = "ieee_emulation_warnings", |
646 | .data = &sysctl_ieee_emulation_warnings, | |
647 | .maxlen = sizeof(int), | |
648 | .mode = 0644, | |
6d456111 | 649 | .proc_handler = proc_dointvec, |
1da177e4 | 650 | }, |
1da177e4 LT |
651 | #endif |
652 | { | |
1da177e4 | 653 | .procname = "userprocess_debug", |
ab3c68ee | 654 | .data = &show_unhandled_signals, |
1da177e4 LT |
655 | .maxlen = sizeof(int), |
656 | .mode = 0644, | |
6d456111 | 657 | .proc_handler = proc_dointvec, |
1da177e4 LT |
658 | }, |
659 | #endif | |
660 | { | |
1da177e4 LT |
661 | .procname = "pid_max", |
662 | .data = &pid_max, | |
663 | .maxlen = sizeof (int), | |
664 | .mode = 0644, | |
6d456111 | 665 | .proc_handler = proc_dointvec_minmax, |
1da177e4 LT |
666 | .extra1 = &pid_max_min, |
667 | .extra2 = &pid_max_max, | |
668 | }, | |
669 | { | |
1da177e4 LT |
670 | .procname = "panic_on_oops", |
671 | .data = &panic_on_oops, | |
672 | .maxlen = sizeof(int), | |
673 | .mode = 0644, | |
6d456111 | 674 | .proc_handler = proc_dointvec, |
1da177e4 | 675 | }, |
7ef3d2fd JP |
676 | #if defined CONFIG_PRINTK |
677 | { | |
7ef3d2fd JP |
678 | .procname = "printk", |
679 | .data = &console_loglevel, | |
680 | .maxlen = 4*sizeof(int), | |
681 | .mode = 0644, | |
6d456111 | 682 | .proc_handler = proc_dointvec, |
7ef3d2fd | 683 | }, |
1da177e4 | 684 | { |
1da177e4 | 685 | .procname = "printk_ratelimit", |
717115e1 | 686 | .data = &printk_ratelimit_state.interval, |
1da177e4 LT |
687 | .maxlen = sizeof(int), |
688 | .mode = 0644, | |
6d456111 | 689 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
690 | }, |
691 | { | |
1da177e4 | 692 | .procname = "printk_ratelimit_burst", |
717115e1 | 693 | .data = &printk_ratelimit_state.burst, |
1da177e4 LT |
694 | .maxlen = sizeof(int), |
695 | .mode = 0644, | |
6d456111 | 696 | .proc_handler = proc_dointvec, |
1da177e4 | 697 | }, |
af91322e | 698 | { |
af91322e DY |
699 | .procname = "printk_delay", |
700 | .data = &printk_delay_msec, | |
701 | .maxlen = sizeof(int), | |
702 | .mode = 0644, | |
6d456111 | 703 | .proc_handler = proc_dointvec_minmax, |
af91322e DY |
704 | .extra1 = &zero, |
705 | .extra2 = &ten_thousand, | |
706 | }, | |
eaf06b24 DR |
707 | { |
708 | .procname = "dmesg_restrict", | |
709 | .data = &dmesg_restrict, | |
710 | .maxlen = sizeof(int), | |
711 | .mode = 0644, | |
712 | .proc_handler = proc_dointvec_minmax, | |
713 | .extra1 = &zero, | |
714 | .extra2 = &one, | |
715 | }, | |
455cd5ab DR |
716 | { |
717 | .procname = "kptr_restrict", | |
718 | .data = &kptr_restrict, | |
719 | .maxlen = sizeof(int), | |
720 | .mode = 0644, | |
bfdc0b49 | 721 | .proc_handler = proc_dmesg_restrict, |
455cd5ab DR |
722 | .extra1 = &zero, |
723 | .extra2 = &two, | |
724 | }, | |
df6e61d4 | 725 | #endif |
1da177e4 | 726 | { |
1da177e4 LT |
727 | .procname = "ngroups_max", |
728 | .data = &ngroups_max, | |
729 | .maxlen = sizeof (int), | |
730 | .mode = 0444, | |
6d456111 | 731 | .proc_handler = proc_dointvec, |
1da177e4 | 732 | }, |
58687acb | 733 | #if defined(CONFIG_LOCKUP_DETECTOR) |
504d7cf1 | 734 | { |
58687acb DZ |
735 | .procname = "watchdog", |
736 | .data = &watchdog_enabled, | |
504d7cf1 DZ |
737 | .maxlen = sizeof (int), |
738 | .mode = 0644, | |
586692a5 MSB |
739 | .proc_handler = proc_dowatchdog, |
740 | .extra1 = &zero, | |
741 | .extra2 = &one, | |
58687acb DZ |
742 | }, |
743 | { | |
744 | .procname = "watchdog_thresh", | |
586692a5 | 745 | .data = &watchdog_thresh, |
58687acb DZ |
746 | .maxlen = sizeof(int), |
747 | .mode = 0644, | |
586692a5 | 748 | .proc_handler = proc_dowatchdog, |
58687acb DZ |
749 | .extra1 = &neg_one, |
750 | .extra2 = &sixty, | |
504d7cf1 | 751 | }, |
2508ce18 DZ |
752 | { |
753 | .procname = "softlockup_panic", | |
754 | .data = &softlockup_panic, | |
755 | .maxlen = sizeof(int), | |
756 | .mode = 0644, | |
757 | .proc_handler = proc_dointvec_minmax, | |
758 | .extra1 = &zero, | |
759 | .extra2 = &one, | |
760 | }, | |
5dc30558 DZ |
761 | { |
762 | .procname = "nmi_watchdog", | |
763 | .data = &watchdog_enabled, | |
764 | .maxlen = sizeof (int), | |
765 | .mode = 0644, | |
586692a5 MSB |
766 | .proc_handler = proc_dowatchdog, |
767 | .extra1 = &zero, | |
768 | .extra2 = &one, | |
5dc30558 DZ |
769 | }, |
770 | #endif | |
771 | #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86) | |
772 | { | |
773 | .procname = "unknown_nmi_panic", | |
774 | .data = &unknown_nmi_panic, | |
775 | .maxlen = sizeof (int), | |
776 | .mode = 0644, | |
777 | .proc_handler = proc_dointvec, | |
778 | }, | |
504d7cf1 | 779 | #endif |
1da177e4 | 780 | #if defined(CONFIG_X86) |
8da5adda | 781 | { |
8da5adda DZ |
782 | .procname = "panic_on_unrecovered_nmi", |
783 | .data = &panic_on_unrecovered_nmi, | |
784 | .maxlen = sizeof(int), | |
785 | .mode = 0644, | |
6d456111 | 786 | .proc_handler = proc_dointvec, |
8da5adda | 787 | }, |
5211a242 | 788 | { |
5211a242 KG |
789 | .procname = "panic_on_io_nmi", |
790 | .data = &panic_on_io_nmi, | |
791 | .maxlen = sizeof(int), | |
792 | .mode = 0644, | |
6d456111 | 793 | .proc_handler = proc_dointvec, |
5211a242 | 794 | }, |
1da177e4 | 795 | { |
1da177e4 LT |
796 | .procname = "bootloader_type", |
797 | .data = &bootloader_type, | |
798 | .maxlen = sizeof (int), | |
799 | .mode = 0444, | |
6d456111 | 800 | .proc_handler = proc_dointvec, |
1da177e4 | 801 | }, |
5031296c | 802 | { |
5031296c PA |
803 | .procname = "bootloader_version", |
804 | .data = &bootloader_version, | |
805 | .maxlen = sizeof (int), | |
806 | .mode = 0444, | |
6d456111 | 807 | .proc_handler = proc_dointvec, |
5031296c | 808 | }, |
0741f4d2 | 809 | { |
0741f4d2 CE |
810 | .procname = "kstack_depth_to_print", |
811 | .data = &kstack_depth_to_print, | |
812 | .maxlen = sizeof(int), | |
813 | .mode = 0644, | |
6d456111 | 814 | .proc_handler = proc_dointvec, |
0741f4d2 | 815 | }, |
6e7c4025 | 816 | { |
6e7c4025 IM |
817 | .procname = "io_delay_type", |
818 | .data = &io_delay_type, | |
819 | .maxlen = sizeof(int), | |
820 | .mode = 0644, | |
6d456111 | 821 | .proc_handler = proc_dointvec, |
6e7c4025 | 822 | }, |
1da177e4 | 823 | #endif |
7a9166e3 | 824 | #if defined(CONFIG_MMU) |
1da177e4 | 825 | { |
1da177e4 LT |
826 | .procname = "randomize_va_space", |
827 | .data = &randomize_va_space, | |
828 | .maxlen = sizeof(int), | |
829 | .mode = 0644, | |
6d456111 | 830 | .proc_handler = proc_dointvec, |
1da177e4 | 831 | }, |
7a9166e3 | 832 | #endif |
0152fb37 | 833 | #if defined(CONFIG_S390) && defined(CONFIG_SMP) |
951f22d5 | 834 | { |
951f22d5 MS |
835 | .procname = "spin_retry", |
836 | .data = &spin_retry, | |
837 | .maxlen = sizeof (int), | |
838 | .mode = 0644, | |
6d456111 | 839 | .proc_handler = proc_dointvec, |
951f22d5 | 840 | }, |
c255d844 | 841 | #endif |
673d5b43 | 842 | #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86) |
c255d844 | 843 | { |
c255d844 | 844 | .procname = "acpi_video_flags", |
77afcf78 | 845 | .data = &acpi_realmode_flags, |
c255d844 PM |
846 | .maxlen = sizeof (unsigned long), |
847 | .mode = 0644, | |
6d456111 | 848 | .proc_handler = proc_doulongvec_minmax, |
c255d844 | 849 | }, |
d2b176ed JS |
850 | #endif |
851 | #ifdef CONFIG_IA64 | |
852 | { | |
d2b176ed JS |
853 | .procname = "ignore-unaligned-usertrap", |
854 | .data = &no_unaligned_warning, | |
855 | .maxlen = sizeof (int), | |
856 | .mode = 0644, | |
6d456111 | 857 | .proc_handler = proc_dointvec, |
d2b176ed | 858 | }, |
88fc241f | 859 | { |
88fc241f DC |
860 | .procname = "unaligned-dump-stack", |
861 | .data = &unaligned_dump_stack, | |
862 | .maxlen = sizeof (int), | |
863 | .mode = 0644, | |
6d456111 | 864 | .proc_handler = proc_dointvec, |
88fc241f | 865 | }, |
bebfa101 | 866 | #endif |
e162b39a MSB |
867 | #ifdef CONFIG_DETECT_HUNG_TASK |
868 | { | |
e162b39a MSB |
869 | .procname = "hung_task_panic", |
870 | .data = &sysctl_hung_task_panic, | |
871 | .maxlen = sizeof(int), | |
872 | .mode = 0644, | |
6d456111 | 873 | .proc_handler = proc_dointvec_minmax, |
e162b39a MSB |
874 | .extra1 = &zero, |
875 | .extra2 = &one, | |
876 | }, | |
82a1fcb9 | 877 | { |
82a1fcb9 IM |
878 | .procname = "hung_task_check_count", |
879 | .data = &sysctl_hung_task_check_count, | |
90739081 | 880 | .maxlen = sizeof(unsigned long), |
82a1fcb9 | 881 | .mode = 0644, |
6d456111 | 882 | .proc_handler = proc_doulongvec_minmax, |
82a1fcb9 IM |
883 | }, |
884 | { | |
82a1fcb9 IM |
885 | .procname = "hung_task_timeout_secs", |
886 | .data = &sysctl_hung_task_timeout_secs, | |
90739081 | 887 | .maxlen = sizeof(unsigned long), |
82a1fcb9 | 888 | .mode = 0644, |
6d456111 | 889 | .proc_handler = proc_dohung_task_timeout_secs, |
82a1fcb9 IM |
890 | }, |
891 | { | |
82a1fcb9 IM |
892 | .procname = "hung_task_warnings", |
893 | .data = &sysctl_hung_task_warnings, | |
90739081 | 894 | .maxlen = sizeof(unsigned long), |
82a1fcb9 | 895 | .mode = 0644, |
6d456111 | 896 | .proc_handler = proc_doulongvec_minmax, |
82a1fcb9 | 897 | }, |
c4f3b63f | 898 | #endif |
bebfa101 AK |
899 | #ifdef CONFIG_COMPAT |
900 | { | |
bebfa101 AK |
901 | .procname = "compat-log", |
902 | .data = &compat_log, | |
903 | .maxlen = sizeof (int), | |
904 | .mode = 0644, | |
6d456111 | 905 | .proc_handler = proc_dointvec, |
bebfa101 | 906 | }, |
951f22d5 | 907 | #endif |
23f78d4a IM |
908 | #ifdef CONFIG_RT_MUTEXES |
909 | { | |
23f78d4a IM |
910 | .procname = "max_lock_depth", |
911 | .data = &max_lock_depth, | |
912 | .maxlen = sizeof(int), | |
913 | .mode = 0644, | |
6d456111 | 914 | .proc_handler = proc_dointvec, |
23f78d4a | 915 | }, |
5096add8 | 916 | #endif |
10a0a8d4 | 917 | { |
10a0a8d4 JF |
918 | .procname = "poweroff_cmd", |
919 | .data = &poweroff_cmd, | |
920 | .maxlen = POWEROFF_CMD_PATH_LEN, | |
921 | .mode = 0644, | |
6d456111 | 922 | .proc_handler = proc_dostring, |
10a0a8d4 | 923 | }, |
0b77f5bf DH |
924 | #ifdef CONFIG_KEYS |
925 | { | |
0b77f5bf DH |
926 | .procname = "keys", |
927 | .mode = 0555, | |
928 | .child = key_sysctls, | |
929 | }, | |
930 | #endif | |
31a72bce PM |
931 | #ifdef CONFIG_RCU_TORTURE_TEST |
932 | { | |
31a72bce PM |
933 | .procname = "rcutorture_runnable", |
934 | .data = &rcutorture_runnable, | |
935 | .maxlen = sizeof(int), | |
936 | .mode = 0644, | |
6d456111 | 937 | .proc_handler = proc_dointvec, |
31a72bce PM |
938 | }, |
939 | #endif | |
cdd6c482 | 940 | #ifdef CONFIG_PERF_EVENTS |
1ccd1549 | 941 | { |
cdd6c482 IM |
942 | .procname = "perf_event_paranoid", |
943 | .data = &sysctl_perf_event_paranoid, | |
944 | .maxlen = sizeof(sysctl_perf_event_paranoid), | |
1ccd1549 | 945 | .mode = 0644, |
6d456111 | 946 | .proc_handler = proc_dointvec, |
1ccd1549 | 947 | }, |
c5078f78 | 948 | { |
cdd6c482 IM |
949 | .procname = "perf_event_mlock_kb", |
950 | .data = &sysctl_perf_event_mlock, | |
951 | .maxlen = sizeof(sysctl_perf_event_mlock), | |
c5078f78 | 952 | .mode = 0644, |
6d456111 | 953 | .proc_handler = proc_dointvec, |
c5078f78 | 954 | }, |
a78ac325 | 955 | { |
cdd6c482 IM |
956 | .procname = "perf_event_max_sample_rate", |
957 | .data = &sysctl_perf_event_sample_rate, | |
958 | .maxlen = sizeof(sysctl_perf_event_sample_rate), | |
a78ac325 | 959 | .mode = 0644, |
163ec435 | 960 | .proc_handler = perf_proc_update_handler, |
a78ac325 | 961 | }, |
1ccd1549 | 962 | #endif |
dfec072e VN |
963 | #ifdef CONFIG_KMEMCHECK |
964 | { | |
dfec072e VN |
965 | .procname = "kmemcheck", |
966 | .data = &kmemcheck_enabled, | |
967 | .maxlen = sizeof(int), | |
968 | .mode = 0644, | |
6d456111 | 969 | .proc_handler = proc_dointvec, |
dfec072e VN |
970 | }, |
971 | #endif | |
cb684b5b | 972 | #ifdef CONFIG_BLOCK |
5e605b64 | 973 | { |
5e605b64 JA |
974 | .procname = "blk_iopoll", |
975 | .data = &blk_iopoll_enabled, | |
976 | .maxlen = sizeof(int), | |
977 | .mode = 0644, | |
6d456111 | 978 | .proc_handler = proc_dointvec, |
5e605b64 | 979 | }, |
cb684b5b | 980 | #endif |
6fce56ec | 981 | { } |
1da177e4 LT |
982 | }; |
983 | ||
d8217f07 | 984 | static struct ctl_table vm_table[] = { |
1da177e4 | 985 | { |
1da177e4 LT |
986 | .procname = "overcommit_memory", |
987 | .data = &sysctl_overcommit_memory, | |
988 | .maxlen = sizeof(sysctl_overcommit_memory), | |
989 | .mode = 0644, | |
cb16e95f PH |
990 | .proc_handler = proc_dointvec_minmax, |
991 | .extra1 = &zero, | |
992 | .extra2 = &two, | |
1da177e4 | 993 | }, |
fadd8fbd | 994 | { |
fadd8fbd KH |
995 | .procname = "panic_on_oom", |
996 | .data = &sysctl_panic_on_oom, | |
997 | .maxlen = sizeof(sysctl_panic_on_oom), | |
998 | .mode = 0644, | |
cb16e95f PH |
999 | .proc_handler = proc_dointvec_minmax, |
1000 | .extra1 = &zero, | |
1001 | .extra2 = &two, | |
fadd8fbd | 1002 | }, |
fe071d7e | 1003 | { |
fe071d7e DR |
1004 | .procname = "oom_kill_allocating_task", |
1005 | .data = &sysctl_oom_kill_allocating_task, | |
1006 | .maxlen = sizeof(sysctl_oom_kill_allocating_task), | |
1007 | .mode = 0644, | |
6d456111 | 1008 | .proc_handler = proc_dointvec, |
fe071d7e | 1009 | }, |
fef1bdd6 | 1010 | { |
fef1bdd6 DR |
1011 | .procname = "oom_dump_tasks", |
1012 | .data = &sysctl_oom_dump_tasks, | |
1013 | .maxlen = sizeof(sysctl_oom_dump_tasks), | |
1014 | .mode = 0644, | |
6d456111 | 1015 | .proc_handler = proc_dointvec, |
fef1bdd6 | 1016 | }, |
1da177e4 | 1017 | { |
1da177e4 LT |
1018 | .procname = "overcommit_ratio", |
1019 | .data = &sysctl_overcommit_ratio, | |
1020 | .maxlen = sizeof(sysctl_overcommit_ratio), | |
1021 | .mode = 0644, | |
6d456111 | 1022 | .proc_handler = proc_dointvec, |
1da177e4 LT |
1023 | }, |
1024 | { | |
1da177e4 LT |
1025 | .procname = "page-cluster", |
1026 | .data = &page_cluster, | |
1027 | .maxlen = sizeof(int), | |
1028 | .mode = 0644, | |
cb16e95f PH |
1029 | .proc_handler = proc_dointvec_minmax, |
1030 | .extra1 = &zero, | |
1da177e4 LT |
1031 | }, |
1032 | { | |
1da177e4 LT |
1033 | .procname = "dirty_background_ratio", |
1034 | .data = &dirty_background_ratio, | |
1035 | .maxlen = sizeof(dirty_background_ratio), | |
1036 | .mode = 0644, | |
6d456111 | 1037 | .proc_handler = dirty_background_ratio_handler, |
1da177e4 LT |
1038 | .extra1 = &zero, |
1039 | .extra2 = &one_hundred, | |
1040 | }, | |
2da02997 | 1041 | { |
2da02997 DR |
1042 | .procname = "dirty_background_bytes", |
1043 | .data = &dirty_background_bytes, | |
1044 | .maxlen = sizeof(dirty_background_bytes), | |
1045 | .mode = 0644, | |
6d456111 | 1046 | .proc_handler = dirty_background_bytes_handler, |
fc3501d4 | 1047 | .extra1 = &one_ul, |
2da02997 | 1048 | }, |
1da177e4 | 1049 | { |
1da177e4 LT |
1050 | .procname = "dirty_ratio", |
1051 | .data = &vm_dirty_ratio, | |
1052 | .maxlen = sizeof(vm_dirty_ratio), | |
1053 | .mode = 0644, | |
6d456111 | 1054 | .proc_handler = dirty_ratio_handler, |
1da177e4 LT |
1055 | .extra1 = &zero, |
1056 | .extra2 = &one_hundred, | |
1057 | }, | |
2da02997 | 1058 | { |
2da02997 DR |
1059 | .procname = "dirty_bytes", |
1060 | .data = &vm_dirty_bytes, | |
1061 | .maxlen = sizeof(vm_dirty_bytes), | |
1062 | .mode = 0644, | |
6d456111 | 1063 | .proc_handler = dirty_bytes_handler, |
9e4a5bda | 1064 | .extra1 = &dirty_bytes_min, |
2da02997 | 1065 | }, |
1da177e4 | 1066 | { |
1da177e4 | 1067 | .procname = "dirty_writeback_centisecs", |
f6ef9438 BS |
1068 | .data = &dirty_writeback_interval, |
1069 | .maxlen = sizeof(dirty_writeback_interval), | |
1da177e4 | 1070 | .mode = 0644, |
6d456111 | 1071 | .proc_handler = dirty_writeback_centisecs_handler, |
1da177e4 LT |
1072 | }, |
1073 | { | |
1da177e4 | 1074 | .procname = "dirty_expire_centisecs", |
f6ef9438 BS |
1075 | .data = &dirty_expire_interval, |
1076 | .maxlen = sizeof(dirty_expire_interval), | |
1da177e4 | 1077 | .mode = 0644, |
cb16e95f PH |
1078 | .proc_handler = proc_dointvec_minmax, |
1079 | .extra1 = &zero, | |
1da177e4 LT |
1080 | }, |
1081 | { | |
1da177e4 LT |
1082 | .procname = "nr_pdflush_threads", |
1083 | .data = &nr_pdflush_threads, | |
1084 | .maxlen = sizeof nr_pdflush_threads, | |
1085 | .mode = 0444 /* read-only*/, | |
6d456111 | 1086 | .proc_handler = proc_dointvec, |
1da177e4 LT |
1087 | }, |
1088 | { | |
1da177e4 LT |
1089 | .procname = "swappiness", |
1090 | .data = &vm_swappiness, | |
1091 | .maxlen = sizeof(vm_swappiness), | |
1092 | .mode = 0644, | |
6d456111 | 1093 | .proc_handler = proc_dointvec_minmax, |
1da177e4 LT |
1094 | .extra1 = &zero, |
1095 | .extra2 = &one_hundred, | |
1096 | }, | |
1097 | #ifdef CONFIG_HUGETLB_PAGE | |
06808b08 | 1098 | { |
1da177e4 | 1099 | .procname = "nr_hugepages", |
e5ff2159 | 1100 | .data = NULL, |
1da177e4 LT |
1101 | .maxlen = sizeof(unsigned long), |
1102 | .mode = 0644, | |
6d456111 | 1103 | .proc_handler = hugetlb_sysctl_handler, |
1da177e4 LT |
1104 | .extra1 = (void *)&hugetlb_zero, |
1105 | .extra2 = (void *)&hugetlb_infinity, | |
06808b08 LS |
1106 | }, |
1107 | #ifdef CONFIG_NUMA | |
1108 | { | |
1109 | .procname = "nr_hugepages_mempolicy", | |
1110 | .data = NULL, | |
1111 | .maxlen = sizeof(unsigned long), | |
1112 | .mode = 0644, | |
1113 | .proc_handler = &hugetlb_mempolicy_sysctl_handler, | |
1114 | .extra1 = (void *)&hugetlb_zero, | |
1115 | .extra2 = (void *)&hugetlb_infinity, | |
1116 | }, | |
1117 | #endif | |
1da177e4 | 1118 | { |
1da177e4 LT |
1119 | .procname = "hugetlb_shm_group", |
1120 | .data = &sysctl_hugetlb_shm_group, | |
1121 | .maxlen = sizeof(gid_t), | |
1122 | .mode = 0644, | |
6d456111 | 1123 | .proc_handler = proc_dointvec, |
1da177e4 | 1124 | }, |
396faf03 | 1125 | { |
396faf03 MG |
1126 | .procname = "hugepages_treat_as_movable", |
1127 | .data = &hugepages_treat_as_movable, | |
1128 | .maxlen = sizeof(int), | |
1129 | .mode = 0644, | |
6d456111 | 1130 | .proc_handler = hugetlb_treat_movable_handler, |
396faf03 | 1131 | }, |
d1c3fb1f | 1132 | { |
d1c3fb1f | 1133 | .procname = "nr_overcommit_hugepages", |
e5ff2159 AK |
1134 | .data = NULL, |
1135 | .maxlen = sizeof(unsigned long), | |
d1c3fb1f | 1136 | .mode = 0644, |
6d456111 | 1137 | .proc_handler = hugetlb_overcommit_handler, |
e5ff2159 AK |
1138 | .extra1 = (void *)&hugetlb_zero, |
1139 | .extra2 = (void *)&hugetlb_infinity, | |
d1c3fb1f | 1140 | }, |
1da177e4 LT |
1141 | #endif |
1142 | { | |
1da177e4 LT |
1143 | .procname = "lowmem_reserve_ratio", |
1144 | .data = &sysctl_lowmem_reserve_ratio, | |
1145 | .maxlen = sizeof(sysctl_lowmem_reserve_ratio), | |
1146 | .mode = 0644, | |
6d456111 | 1147 | .proc_handler = lowmem_reserve_ratio_sysctl_handler, |
1da177e4 | 1148 | }, |
9d0243bc | 1149 | { |
9d0243bc AM |
1150 | .procname = "drop_caches", |
1151 | .data = &sysctl_drop_caches, | |
1152 | .maxlen = sizeof(int), | |
1153 | .mode = 0644, | |
1154 | .proc_handler = drop_caches_sysctl_handler, | |
cb16e95f PH |
1155 | .extra1 = &one, |
1156 | .extra2 = &three, | |
9d0243bc | 1157 | }, |
76ab0f53 MG |
1158 | #ifdef CONFIG_COMPACTION |
1159 | { | |
1160 | .procname = "compact_memory", | |
1161 | .data = &sysctl_compact_memory, | |
1162 | .maxlen = sizeof(int), | |
1163 | .mode = 0200, | |
1164 | .proc_handler = sysctl_compaction_handler, | |
1165 | }, | |
5e771905 MG |
1166 | { |
1167 | .procname = "extfrag_threshold", | |
1168 | .data = &sysctl_extfrag_threshold, | |
1169 | .maxlen = sizeof(int), | |
1170 | .mode = 0644, | |
1171 | .proc_handler = sysctl_extfrag_handler, | |
1172 | .extra1 = &min_extfrag_threshold, | |
1173 | .extra2 = &max_extfrag_threshold, | |
1174 | }, | |
1175 | ||
76ab0f53 | 1176 | #endif /* CONFIG_COMPACTION */ |
1da177e4 | 1177 | { |
1da177e4 LT |
1178 | .procname = "min_free_kbytes", |
1179 | .data = &min_free_kbytes, | |
1180 | .maxlen = sizeof(min_free_kbytes), | |
1181 | .mode = 0644, | |
6d456111 | 1182 | .proc_handler = min_free_kbytes_sysctl_handler, |
1da177e4 LT |
1183 | .extra1 = &zero, |
1184 | }, | |
8ad4b1fb | 1185 | { |
8ad4b1fb RS |
1186 | .procname = "percpu_pagelist_fraction", |
1187 | .data = &percpu_pagelist_fraction, | |
1188 | .maxlen = sizeof(percpu_pagelist_fraction), | |
1189 | .mode = 0644, | |
6d456111 | 1190 | .proc_handler = percpu_pagelist_fraction_sysctl_handler, |
8ad4b1fb RS |
1191 | .extra1 = &min_percpu_pagelist_fract, |
1192 | }, | |
1da177e4 LT |
1193 | #ifdef CONFIG_MMU |
1194 | { | |
1da177e4 LT |
1195 | .procname = "max_map_count", |
1196 | .data = &sysctl_max_map_count, | |
1197 | .maxlen = sizeof(sysctl_max_map_count), | |
1198 | .mode = 0644, | |
3e26120c | 1199 | .proc_handler = proc_dointvec_minmax, |
70da2340 | 1200 | .extra1 = &zero, |
1da177e4 | 1201 | }, |
dd8632a1 PM |
1202 | #else |
1203 | { | |
dd8632a1 PM |
1204 | .procname = "nr_trim_pages", |
1205 | .data = &sysctl_nr_trim_pages, | |
1206 | .maxlen = sizeof(sysctl_nr_trim_pages), | |
1207 | .mode = 0644, | |
6d456111 | 1208 | .proc_handler = proc_dointvec_minmax, |
dd8632a1 PM |
1209 | .extra1 = &zero, |
1210 | }, | |
1da177e4 LT |
1211 | #endif |
1212 | { | |
1da177e4 LT |
1213 | .procname = "laptop_mode", |
1214 | .data = &laptop_mode, | |
1215 | .maxlen = sizeof(laptop_mode), | |
1216 | .mode = 0644, | |
6d456111 | 1217 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
1218 | }, |
1219 | { | |
1da177e4 LT |
1220 | .procname = "block_dump", |
1221 | .data = &block_dump, | |
1222 | .maxlen = sizeof(block_dump), | |
1223 | .mode = 0644, | |
6d456111 | 1224 | .proc_handler = proc_dointvec, |
1da177e4 LT |
1225 | .extra1 = &zero, |
1226 | }, | |
1227 | { | |
1da177e4 LT |
1228 | .procname = "vfs_cache_pressure", |
1229 | .data = &sysctl_vfs_cache_pressure, | |
1230 | .maxlen = sizeof(sysctl_vfs_cache_pressure), | |
1231 | .mode = 0644, | |
6d456111 | 1232 | .proc_handler = proc_dointvec, |
1da177e4 LT |
1233 | .extra1 = &zero, |
1234 | }, | |
1235 | #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT | |
1236 | { | |
1da177e4 LT |
1237 | .procname = "legacy_va_layout", |
1238 | .data = &sysctl_legacy_va_layout, | |
1239 | .maxlen = sizeof(sysctl_legacy_va_layout), | |
1240 | .mode = 0644, | |
6d456111 | 1241 | .proc_handler = proc_dointvec, |
1da177e4 LT |
1242 | .extra1 = &zero, |
1243 | }, | |
1244 | #endif | |
1743660b CL |
1245 | #ifdef CONFIG_NUMA |
1246 | { | |
1743660b CL |
1247 | .procname = "zone_reclaim_mode", |
1248 | .data = &zone_reclaim_mode, | |
1249 | .maxlen = sizeof(zone_reclaim_mode), | |
1250 | .mode = 0644, | |
6d456111 | 1251 | .proc_handler = proc_dointvec, |
c84db23c | 1252 | .extra1 = &zero, |
1743660b | 1253 | }, |
9614634f | 1254 | { |
9614634f CL |
1255 | .procname = "min_unmapped_ratio", |
1256 | .data = &sysctl_min_unmapped_ratio, | |
1257 | .maxlen = sizeof(sysctl_min_unmapped_ratio), | |
1258 | .mode = 0644, | |
6d456111 | 1259 | .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler, |
9614634f CL |
1260 | .extra1 = &zero, |
1261 | .extra2 = &one_hundred, | |
1262 | }, | |
0ff38490 | 1263 | { |
0ff38490 CL |
1264 | .procname = "min_slab_ratio", |
1265 | .data = &sysctl_min_slab_ratio, | |
1266 | .maxlen = sizeof(sysctl_min_slab_ratio), | |
1267 | .mode = 0644, | |
6d456111 | 1268 | .proc_handler = sysctl_min_slab_ratio_sysctl_handler, |
0ff38490 CL |
1269 | .extra1 = &zero, |
1270 | .extra2 = &one_hundred, | |
1271 | }, | |
e6e5494c | 1272 | #endif |
77461ab3 CL |
1273 | #ifdef CONFIG_SMP |
1274 | { | |
77461ab3 CL |
1275 | .procname = "stat_interval", |
1276 | .data = &sysctl_stat_interval, | |
1277 | .maxlen = sizeof(sysctl_stat_interval), | |
1278 | .mode = 0644, | |
6d456111 | 1279 | .proc_handler = proc_dointvec_jiffies, |
77461ab3 CL |
1280 | }, |
1281 | #endif | |
6e141546 | 1282 | #ifdef CONFIG_MMU |
ed032189 | 1283 | { |
ed032189 | 1284 | .procname = "mmap_min_addr", |
788084ab EP |
1285 | .data = &dac_mmap_min_addr, |
1286 | .maxlen = sizeof(unsigned long), | |
ed032189 | 1287 | .mode = 0644, |
6d456111 | 1288 | .proc_handler = mmap_min_addr_handler, |
ed032189 | 1289 | }, |
6e141546 | 1290 | #endif |
f0c0b2b8 KH |
1291 | #ifdef CONFIG_NUMA |
1292 | { | |
f0c0b2b8 KH |
1293 | .procname = "numa_zonelist_order", |
1294 | .data = &numa_zonelist_order, | |
1295 | .maxlen = NUMA_ZONELIST_ORDER_LEN, | |
1296 | .mode = 0644, | |
6d456111 | 1297 | .proc_handler = numa_zonelist_order_handler, |
f0c0b2b8 KH |
1298 | }, |
1299 | #endif | |
2b8232ce | 1300 | #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \ |
5c36e657 | 1301 | (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL)) |
e6e5494c | 1302 | { |
e6e5494c IM |
1303 | .procname = "vdso_enabled", |
1304 | .data = &vdso_enabled, | |
1305 | .maxlen = sizeof(vdso_enabled), | |
1306 | .mode = 0644, | |
6d456111 | 1307 | .proc_handler = proc_dointvec, |
e6e5494c IM |
1308 | .extra1 = &zero, |
1309 | }, | |
1da177e4 | 1310 | #endif |
195cf453 BG |
1311 | #ifdef CONFIG_HIGHMEM |
1312 | { | |
195cf453 BG |
1313 | .procname = "highmem_is_dirtyable", |
1314 | .data = &vm_highmem_is_dirtyable, | |
1315 | .maxlen = sizeof(vm_highmem_is_dirtyable), | |
1316 | .mode = 0644, | |
6d456111 | 1317 | .proc_handler = proc_dointvec_minmax, |
195cf453 BG |
1318 | .extra1 = &zero, |
1319 | .extra2 = &one, | |
1320 | }, | |
1321 | #endif | |
4be6f6bb | 1322 | { |
4be6f6bb PZ |
1323 | .procname = "scan_unevictable_pages", |
1324 | .data = &scan_unevictable_pages, | |
1325 | .maxlen = sizeof(scan_unevictable_pages), | |
1326 | .mode = 0644, | |
6d456111 | 1327 | .proc_handler = scan_unevictable_handler, |
4be6f6bb | 1328 | }, |
6a46079c AK |
1329 | #ifdef CONFIG_MEMORY_FAILURE |
1330 | { | |
6a46079c AK |
1331 | .procname = "memory_failure_early_kill", |
1332 | .data = &sysctl_memory_failure_early_kill, | |
1333 | .maxlen = sizeof(sysctl_memory_failure_early_kill), | |
1334 | .mode = 0644, | |
6d456111 | 1335 | .proc_handler = proc_dointvec_minmax, |
6a46079c AK |
1336 | .extra1 = &zero, |
1337 | .extra2 = &one, | |
1338 | }, | |
1339 | { | |
6a46079c AK |
1340 | .procname = "memory_failure_recovery", |
1341 | .data = &sysctl_memory_failure_recovery, | |
1342 | .maxlen = sizeof(sysctl_memory_failure_recovery), | |
1343 | .mode = 0644, | |
6d456111 | 1344 | .proc_handler = proc_dointvec_minmax, |
6a46079c AK |
1345 | .extra1 = &zero, |
1346 | .extra2 = &one, | |
1347 | }, | |
1348 | #endif | |
6fce56ec | 1349 | { } |
1da177e4 LT |
1350 | }; |
1351 | ||
2abc26fc | 1352 | #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) |
d8217f07 | 1353 | static struct ctl_table binfmt_misc_table[] = { |
6fce56ec | 1354 | { } |
2abc26fc EB |
1355 | }; |
1356 | #endif | |
1357 | ||
d8217f07 | 1358 | static struct ctl_table fs_table[] = { |
1da177e4 | 1359 | { |
1da177e4 LT |
1360 | .procname = "inode-nr", |
1361 | .data = &inodes_stat, | |
1362 | .maxlen = 2*sizeof(int), | |
1363 | .mode = 0444, | |
cffbc8aa | 1364 | .proc_handler = proc_nr_inodes, |
1da177e4 LT |
1365 | }, |
1366 | { | |
1da177e4 LT |
1367 | .procname = "inode-state", |
1368 | .data = &inodes_stat, | |
1369 | .maxlen = 7*sizeof(int), | |
1370 | .mode = 0444, | |
cffbc8aa | 1371 | .proc_handler = proc_nr_inodes, |
1da177e4 LT |
1372 | }, |
1373 | { | |
1da177e4 LT |
1374 | .procname = "file-nr", |
1375 | .data = &files_stat, | |
518de9b3 | 1376 | .maxlen = sizeof(files_stat), |
1da177e4 | 1377 | .mode = 0444, |
6d456111 | 1378 | .proc_handler = proc_nr_files, |
1da177e4 LT |
1379 | }, |
1380 | { | |
1da177e4 LT |
1381 | .procname = "file-max", |
1382 | .data = &files_stat.max_files, | |
518de9b3 | 1383 | .maxlen = sizeof(files_stat.max_files), |
1da177e4 | 1384 | .mode = 0644, |
518de9b3 | 1385 | .proc_handler = proc_doulongvec_minmax, |
1da177e4 | 1386 | }, |
9cfe015a | 1387 | { |
9cfe015a ED |
1388 | .procname = "nr_open", |
1389 | .data = &sysctl_nr_open, | |
1390 | .maxlen = sizeof(int), | |
1391 | .mode = 0644, | |
6d456111 | 1392 | .proc_handler = proc_dointvec_minmax, |
eceea0b3 AV |
1393 | .extra1 = &sysctl_nr_open_min, |
1394 | .extra2 = &sysctl_nr_open_max, | |
9cfe015a | 1395 | }, |
1da177e4 | 1396 | { |
1da177e4 LT |
1397 | .procname = "dentry-state", |
1398 | .data = &dentry_stat, | |
1399 | .maxlen = 6*sizeof(int), | |
1400 | .mode = 0444, | |
312d3ca8 | 1401 | .proc_handler = proc_nr_dentry, |
1da177e4 LT |
1402 | }, |
1403 | { | |
1da177e4 LT |
1404 | .procname = "overflowuid", |
1405 | .data = &fs_overflowuid, | |
1406 | .maxlen = sizeof(int), | |
1407 | .mode = 0644, | |
6d456111 | 1408 | .proc_handler = proc_dointvec_minmax, |
1da177e4 LT |
1409 | .extra1 = &minolduid, |
1410 | .extra2 = &maxolduid, | |
1411 | }, | |
1412 | { | |
1da177e4 LT |
1413 | .procname = "overflowgid", |
1414 | .data = &fs_overflowgid, | |
1415 | .maxlen = sizeof(int), | |
1416 | .mode = 0644, | |
6d456111 | 1417 | .proc_handler = proc_dointvec_minmax, |
1da177e4 LT |
1418 | .extra1 = &minolduid, |
1419 | .extra2 = &maxolduid, | |
1420 | }, | |
bfcd17a6 | 1421 | #ifdef CONFIG_FILE_LOCKING |
1da177e4 | 1422 | { |
1da177e4 LT |
1423 | .procname = "leases-enable", |
1424 | .data = &leases_enable, | |
1425 | .maxlen = sizeof(int), | |
1426 | .mode = 0644, | |
6d456111 | 1427 | .proc_handler = proc_dointvec, |
1da177e4 | 1428 | }, |
bfcd17a6 | 1429 | #endif |
1da177e4 LT |
1430 | #ifdef CONFIG_DNOTIFY |
1431 | { | |
1da177e4 LT |
1432 | .procname = "dir-notify-enable", |
1433 | .data = &dir_notify_enable, | |
1434 | .maxlen = sizeof(int), | |
1435 | .mode = 0644, | |
6d456111 | 1436 | .proc_handler = proc_dointvec, |
1da177e4 LT |
1437 | }, |
1438 | #endif | |
1439 | #ifdef CONFIG_MMU | |
bfcd17a6 | 1440 | #ifdef CONFIG_FILE_LOCKING |
1da177e4 | 1441 | { |
1da177e4 LT |
1442 | .procname = "lease-break-time", |
1443 | .data = &lease_break_time, | |
1444 | .maxlen = sizeof(int), | |
1445 | .mode = 0644, | |
6d456111 | 1446 | .proc_handler = proc_dointvec, |
1da177e4 | 1447 | }, |
bfcd17a6 | 1448 | #endif |
ebf3f09c | 1449 | #ifdef CONFIG_AIO |
1da177e4 | 1450 | { |
1da177e4 LT |
1451 | .procname = "aio-nr", |
1452 | .data = &aio_nr, | |
1453 | .maxlen = sizeof(aio_nr), | |
1454 | .mode = 0444, | |
6d456111 | 1455 | .proc_handler = proc_doulongvec_minmax, |
1da177e4 LT |
1456 | }, |
1457 | { | |
1da177e4 LT |
1458 | .procname = "aio-max-nr", |
1459 | .data = &aio_max_nr, | |
1460 | .maxlen = sizeof(aio_max_nr), | |
1461 | .mode = 0644, | |
6d456111 | 1462 | .proc_handler = proc_doulongvec_minmax, |
1da177e4 | 1463 | }, |
ebf3f09c | 1464 | #endif /* CONFIG_AIO */ |
2d9048e2 | 1465 | #ifdef CONFIG_INOTIFY_USER |
0399cb08 | 1466 | { |
0399cb08 RL |
1467 | .procname = "inotify", |
1468 | .mode = 0555, | |
1469 | .child = inotify_table, | |
1470 | }, | |
1471 | #endif | |
7ef9964e DL |
1472 | #ifdef CONFIG_EPOLL |
1473 | { | |
1474 | .procname = "epoll", | |
1475 | .mode = 0555, | |
1476 | .child = epoll_table, | |
1477 | }, | |
1478 | #endif | |
1da177e4 | 1479 | #endif |
d6e71144 | 1480 | { |
d6e71144 AC |
1481 | .procname = "suid_dumpable", |
1482 | .data = &suid_dumpable, | |
1483 | .maxlen = sizeof(int), | |
1484 | .mode = 0644, | |
6d456111 | 1485 | .proc_handler = proc_dointvec_minmax, |
8e654fba MW |
1486 | .extra1 = &zero, |
1487 | .extra2 = &two, | |
d6e71144 | 1488 | }, |
2abc26fc EB |
1489 | #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) |
1490 | { | |
2abc26fc EB |
1491 | .procname = "binfmt_misc", |
1492 | .mode = 0555, | |
1493 | .child = binfmt_misc_table, | |
1494 | }, | |
1495 | #endif | |
b492e95b | 1496 | { |
ff9da691 JA |
1497 | .procname = "pipe-max-size", |
1498 | .data = &pipe_max_size, | |
b492e95b JA |
1499 | .maxlen = sizeof(int), |
1500 | .mode = 0644, | |
ff9da691 JA |
1501 | .proc_handler = &pipe_proc_fn, |
1502 | .extra1 = &pipe_min_size, | |
b492e95b | 1503 | }, |
6fce56ec | 1504 | { } |
1da177e4 LT |
1505 | }; |
1506 | ||
d8217f07 | 1507 | static struct ctl_table debug_table[] = { |
ab3c68ee | 1508 | #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_SPARC) || \ |
571d76ac | 1509 | defined(CONFIG_S390) || defined(CONFIG_TILE) |
abd4f750 | 1510 | { |
abd4f750 MAS |
1511 | .procname = "exception-trace", |
1512 | .data = &show_unhandled_signals, | |
1513 | .maxlen = sizeof(int), | |
1514 | .mode = 0644, | |
1515 | .proc_handler = proc_dointvec | |
1516 | }, | |
b2be84df MH |
1517 | #endif |
1518 | #if defined(CONFIG_OPTPROBES) | |
1519 | { | |
1520 | .procname = "kprobes-optimization", | |
1521 | .data = &sysctl_kprobes_optimization, | |
1522 | .maxlen = sizeof(int), | |
1523 | .mode = 0644, | |
1524 | .proc_handler = proc_kprobes_optimization_handler, | |
1525 | .extra1 = &zero, | |
1526 | .extra2 = &one, | |
1527 | }, | |
abd4f750 | 1528 | #endif |
6fce56ec | 1529 | { } |
1da177e4 LT |
1530 | }; |
1531 | ||
d8217f07 | 1532 | static struct ctl_table dev_table[] = { |
6fce56ec | 1533 | { } |
0eeca283 | 1534 | }; |
1da177e4 | 1535 | |
330d57fb AV |
1536 | static DEFINE_SPINLOCK(sysctl_lock); |
1537 | ||
1538 | /* called under sysctl_lock */ | |
1539 | static int use_table(struct ctl_table_header *p) | |
1540 | { | |
1541 | if (unlikely(p->unregistering)) | |
1542 | return 0; | |
1543 | p->used++; | |
1544 | return 1; | |
1545 | } | |
1546 | ||
1547 | /* called under sysctl_lock */ | |
1548 | static void unuse_table(struct ctl_table_header *p) | |
1549 | { | |
1550 | if (!--p->used) | |
1551 | if (unlikely(p->unregistering)) | |
1552 | complete(p->unregistering); | |
1553 | } | |
1554 | ||
1555 | /* called under sysctl_lock, will reacquire if has to wait */ | |
1556 | static void start_unregistering(struct ctl_table_header *p) | |
1557 | { | |
1558 | /* | |
1559 | * if p->used is 0, nobody will ever touch that entry again; | |
1560 | * we'll eliminate all paths to it before dropping sysctl_lock | |
1561 | */ | |
1562 | if (unlikely(p->used)) { | |
1563 | struct completion wait; | |
1564 | init_completion(&wait); | |
1565 | p->unregistering = &wait; | |
1566 | spin_unlock(&sysctl_lock); | |
1567 | wait_for_completion(&wait); | |
1568 | spin_lock(&sysctl_lock); | |
f7e6ced4 AV |
1569 | } else { |
1570 | /* anything non-NULL; we'll never dereference it */ | |
1571 | p->unregistering = ERR_PTR(-EINVAL); | |
330d57fb AV |
1572 | } |
1573 | /* | |
1574 | * do not remove from the list until nobody holds it; walking the | |
1575 | * list in do_sysctl() relies on that. | |
1576 | */ | |
1577 | list_del_init(&p->ctl_entry); | |
1578 | } | |
1579 | ||
f7e6ced4 AV |
1580 | void sysctl_head_get(struct ctl_table_header *head) |
1581 | { | |
1582 | spin_lock(&sysctl_lock); | |
1583 | head->count++; | |
1584 | spin_unlock(&sysctl_lock); | |
1585 | } | |
1586 | ||
dfef6dcd AV |
1587 | static void free_head(struct rcu_head *rcu) |
1588 | { | |
1589 | kfree(container_of(rcu, struct ctl_table_header, rcu)); | |
1590 | } | |
1591 | ||
f7e6ced4 AV |
1592 | void sysctl_head_put(struct ctl_table_header *head) |
1593 | { | |
1594 | spin_lock(&sysctl_lock); | |
1595 | if (!--head->count) | |
dfef6dcd | 1596 | call_rcu(&head->rcu, free_head); |
f7e6ced4 AV |
1597 | spin_unlock(&sysctl_lock); |
1598 | } | |
1599 | ||
1600 | struct ctl_table_header *sysctl_head_grab(struct ctl_table_header *head) | |
1601 | { | |
1602 | if (!head) | |
1603 | BUG(); | |
1604 | spin_lock(&sysctl_lock); | |
1605 | if (!use_table(head)) | |
1606 | head = ERR_PTR(-ENOENT); | |
1607 | spin_unlock(&sysctl_lock); | |
1608 | return head; | |
1609 | } | |
1610 | ||
805b5d5e EB |
1611 | void sysctl_head_finish(struct ctl_table_header *head) |
1612 | { | |
1613 | if (!head) | |
1614 | return; | |
1615 | spin_lock(&sysctl_lock); | |
1616 | unuse_table(head); | |
1617 | spin_unlock(&sysctl_lock); | |
1618 | } | |
1619 | ||
73455092 AV |
1620 | static struct ctl_table_set * |
1621 | lookup_header_set(struct ctl_table_root *root, struct nsproxy *namespaces) | |
1622 | { | |
1623 | struct ctl_table_set *set = &root->default_set; | |
1624 | if (root->lookup) | |
1625 | set = root->lookup(root, namespaces); | |
1626 | return set; | |
1627 | } | |
1628 | ||
e51b6ba0 EB |
1629 | static struct list_head * |
1630 | lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces) | |
805b5d5e | 1631 | { |
73455092 AV |
1632 | struct ctl_table_set *set = lookup_header_set(root, namespaces); |
1633 | return &set->list; | |
e51b6ba0 EB |
1634 | } |
1635 | ||
1636 | struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces, | |
1637 | struct ctl_table_header *prev) | |
1638 | { | |
1639 | struct ctl_table_root *root; | |
1640 | struct list_head *header_list; | |
805b5d5e EB |
1641 | struct ctl_table_header *head; |
1642 | struct list_head *tmp; | |
e51b6ba0 | 1643 | |
805b5d5e EB |
1644 | spin_lock(&sysctl_lock); |
1645 | if (prev) { | |
e51b6ba0 | 1646 | head = prev; |
805b5d5e EB |
1647 | tmp = &prev->ctl_entry; |
1648 | unuse_table(prev); | |
1649 | goto next; | |
1650 | } | |
1651 | tmp = &root_table_header.ctl_entry; | |
1652 | for (;;) { | |
1653 | head = list_entry(tmp, struct ctl_table_header, ctl_entry); | |
1654 | ||
1655 | if (!use_table(head)) | |
1656 | goto next; | |
1657 | spin_unlock(&sysctl_lock); | |
1658 | return head; | |
1659 | next: | |
e51b6ba0 | 1660 | root = head->root; |
805b5d5e | 1661 | tmp = tmp->next; |
e51b6ba0 EB |
1662 | header_list = lookup_header_list(root, namespaces); |
1663 | if (tmp != header_list) | |
1664 | continue; | |
1665 | ||
1666 | do { | |
1667 | root = list_entry(root->root_list.next, | |
1668 | struct ctl_table_root, root_list); | |
1669 | if (root == &sysctl_table_root) | |
1670 | goto out; | |
1671 | header_list = lookup_header_list(root, namespaces); | |
1672 | } while (list_empty(header_list)); | |
1673 | tmp = header_list->next; | |
805b5d5e | 1674 | } |
e51b6ba0 | 1675 | out: |
805b5d5e EB |
1676 | spin_unlock(&sysctl_lock); |
1677 | return NULL; | |
1678 | } | |
1679 | ||
e51b6ba0 EB |
1680 | struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev) |
1681 | { | |
1682 | return __sysctl_head_next(current->nsproxy, prev); | |
1683 | } | |
1684 | ||
1685 | void register_sysctl_root(struct ctl_table_root *root) | |
1686 | { | |
1687 | spin_lock(&sysctl_lock); | |
1688 | list_add_tail(&root->root_list, &sysctl_table_root.root_list); | |
1689 | spin_unlock(&sysctl_lock); | |
1690 | } | |
1691 | ||
1da177e4 | 1692 | /* |
1ff007eb | 1693 | * sysctl_perm does NOT grant the superuser all rights automatically, because |
1da177e4 LT |
1694 | * some sysctl variables are readonly even to root. |
1695 | */ | |
1696 | ||
1697 | static int test_perm(int mode, int op) | |
1698 | { | |
76aac0e9 | 1699 | if (!current_euid()) |
1da177e4 LT |
1700 | mode >>= 6; |
1701 | else if (in_egroup_p(0)) | |
1702 | mode >>= 3; | |
e6305c43 | 1703 | if ((op & ~mode & (MAY_READ|MAY_WRITE|MAY_EXEC)) == 0) |
1da177e4 LT |
1704 | return 0; |
1705 | return -EACCES; | |
1706 | } | |
1707 | ||
d7321cd6 | 1708 | int sysctl_perm(struct ctl_table_root *root, struct ctl_table *table, int op) |
1da177e4 | 1709 | { |
d7321cd6 PE |
1710 | int mode; |
1711 | ||
d7321cd6 PE |
1712 | if (root->permissions) |
1713 | mode = root->permissions(root, current->nsproxy, table); | |
1714 | else | |
1715 | mode = table->mode; | |
1716 | ||
1717 | return test_perm(mode, op); | |
1da177e4 LT |
1718 | } |
1719 | ||
d912b0cc EB |
1720 | static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table) |
1721 | { | |
2315ffa0 | 1722 | for (; table->procname; table++) { |
d912b0cc EB |
1723 | table->parent = parent; |
1724 | if (table->child) | |
1725 | sysctl_set_parent(table, table->child); | |
1726 | } | |
1727 | } | |
1728 | ||
1729 | static __init int sysctl_init(void) | |
1730 | { | |
1731 | sysctl_set_parent(NULL, root_table); | |
88f458e4 | 1732 | #ifdef CONFIG_SYSCTL_SYSCALL_CHECK |
b3bd3de6 | 1733 | sysctl_check_table(current->nsproxy, root_table); |
88f458e4 | 1734 | #endif |
d912b0cc EB |
1735 | return 0; |
1736 | } | |
1737 | ||
1738 | core_initcall(sysctl_init); | |
1739 | ||
bfbcf034 AV |
1740 | static struct ctl_table *is_branch_in(struct ctl_table *branch, |
1741 | struct ctl_table *table) | |
ae7edecc AV |
1742 | { |
1743 | struct ctl_table *p; | |
1744 | const char *s = branch->procname; | |
1745 | ||
1746 | /* branch should have named subdirectory as its first element */ | |
1747 | if (!s || !branch->child) | |
bfbcf034 | 1748 | return NULL; |
ae7edecc AV |
1749 | |
1750 | /* ... and nothing else */ | |
2315ffa0 | 1751 | if (branch[1].procname) |
bfbcf034 | 1752 | return NULL; |
ae7edecc AV |
1753 | |
1754 | /* table should contain subdirectory with the same name */ | |
2315ffa0 | 1755 | for (p = table; p->procname; p++) { |
ae7edecc AV |
1756 | if (!p->child) |
1757 | continue; | |
1758 | if (p->procname && strcmp(p->procname, s) == 0) | |
bfbcf034 | 1759 | return p; |
ae7edecc | 1760 | } |
bfbcf034 | 1761 | return NULL; |
ae7edecc AV |
1762 | } |
1763 | ||
1764 | /* see if attaching q to p would be an improvement */ | |
1765 | static void try_attach(struct ctl_table_header *p, struct ctl_table_header *q) | |
1766 | { | |
1767 | struct ctl_table *to = p->ctl_table, *by = q->ctl_table; | |
bfbcf034 | 1768 | struct ctl_table *next; |
ae7edecc AV |
1769 | int is_better = 0; |
1770 | int not_in_parent = !p->attached_by; | |
1771 | ||
bfbcf034 | 1772 | while ((next = is_branch_in(by, to)) != NULL) { |
ae7edecc AV |
1773 | if (by == q->attached_by) |
1774 | is_better = 1; | |
1775 | if (to == p->attached_by) | |
1776 | not_in_parent = 1; | |
1777 | by = by->child; | |
bfbcf034 | 1778 | to = next->child; |
ae7edecc AV |
1779 | } |
1780 | ||
1781 | if (is_better && not_in_parent) { | |
1782 | q->attached_by = by; | |
1783 | q->attached_to = to; | |
1784 | q->parent = p; | |
1785 | } | |
1786 | } | |
1787 | ||
1da177e4 | 1788 | /** |
e51b6ba0 EB |
1789 | * __register_sysctl_paths - register a sysctl hierarchy |
1790 | * @root: List of sysctl headers to register on | |
1791 | * @namespaces: Data to compute which lists of sysctl entries are visible | |
29e796fd | 1792 | * @path: The path to the directory the sysctl table is in. |
1da177e4 | 1793 | * @table: the top-level table structure |
1da177e4 LT |
1794 | * |
1795 | * Register a sysctl table hierarchy. @table should be a filled in ctl_table | |
29e796fd | 1796 | * array. A completely 0 filled entry terminates the table. |
1da177e4 | 1797 | * |
d8217f07 | 1798 | * The members of the &struct ctl_table structure are used as follows: |
1da177e4 | 1799 | * |
1da177e4 LT |
1800 | * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not |
1801 | * enter a sysctl file | |
1802 | * | |
1803 | * data - a pointer to data for use by proc_handler | |
1804 | * | |
1805 | * maxlen - the maximum size in bytes of the data | |
1806 | * | |
1807 | * mode - the file permissions for the /proc/sys file, and for sysctl(2) | |
1808 | * | |
1809 | * child - a pointer to the child sysctl table if this entry is a directory, or | |
1810 | * %NULL. | |
1811 | * | |
1812 | * proc_handler - the text handler routine (described below) | |
1813 | * | |
1da177e4 LT |
1814 | * de - for internal use by the sysctl routines |
1815 | * | |
1816 | * extra1, extra2 - extra pointers usable by the proc handler routines | |
1817 | * | |
1818 | * Leaf nodes in the sysctl tree will be represented by a single file | |
1819 | * under /proc; non-leaf nodes will be represented by directories. | |
1820 | * | |
1821 | * sysctl(2) can automatically manage read and write requests through | |
1822 | * the sysctl table. The data and maxlen fields of the ctl_table | |
1823 | * struct enable minimal validation of the values being written to be | |
1824 | * performed, and the mode field allows minimal authentication. | |
1825 | * | |
1da177e4 LT |
1826 | * There must be a proc_handler routine for any terminal nodes |
1827 | * mirrored under /proc/sys (non-terminals are handled by a built-in | |
1828 | * directory handler). Several default handlers are available to | |
1829 | * cover common cases - | |
1830 | * | |
1831 | * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(), | |
1832 | * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(), | |
1833 | * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax() | |
1834 | * | |
1835 | * It is the handler's job to read the input buffer from user memory | |
1836 | * and process it. The handler should return 0 on success. | |
1837 | * | |
1838 | * This routine returns %NULL on a failure to register, and a pointer | |
1839 | * to the table header on success. | |
1840 | */ | |
e51b6ba0 EB |
1841 | struct ctl_table_header *__register_sysctl_paths( |
1842 | struct ctl_table_root *root, | |
1843 | struct nsproxy *namespaces, | |
1844 | const struct ctl_path *path, struct ctl_table *table) | |
1da177e4 | 1845 | { |
29e796fd EB |
1846 | struct ctl_table_header *header; |
1847 | struct ctl_table *new, **prevp; | |
1848 | unsigned int n, npath; | |
ae7edecc | 1849 | struct ctl_table_set *set; |
29e796fd EB |
1850 | |
1851 | /* Count the path components */ | |
2315ffa0 | 1852 | for (npath = 0; path[npath].procname; ++npath) |
29e796fd EB |
1853 | ; |
1854 | ||
1855 | /* | |
1856 | * For each path component, allocate a 2-element ctl_table array. | |
1857 | * The first array element will be filled with the sysctl entry | |
2315ffa0 | 1858 | * for this, the second will be the sentinel (procname == 0). |
29e796fd EB |
1859 | * |
1860 | * We allocate everything in one go so that we don't have to | |
1861 | * worry about freeing additional memory in unregister_sysctl_table. | |
1862 | */ | |
1863 | header = kzalloc(sizeof(struct ctl_table_header) + | |
1864 | (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL); | |
1865 | if (!header) | |
1da177e4 | 1866 | return NULL; |
29e796fd EB |
1867 | |
1868 | new = (struct ctl_table *) (header + 1); | |
1869 | ||
1870 | /* Now connect the dots */ | |
1871 | prevp = &header->ctl_table; | |
1872 | for (n = 0; n < npath; ++n, ++path) { | |
1873 | /* Copy the procname */ | |
1874 | new->procname = path->procname; | |
29e796fd EB |
1875 | new->mode = 0555; |
1876 | ||
1877 | *prevp = new; | |
1878 | prevp = &new->child; | |
1879 | ||
1880 | new += 2; | |
1881 | } | |
1882 | *prevp = table; | |
23eb06de | 1883 | header->ctl_table_arg = table; |
29e796fd EB |
1884 | |
1885 | INIT_LIST_HEAD(&header->ctl_entry); | |
1886 | header->used = 0; | |
1887 | header->unregistering = NULL; | |
e51b6ba0 | 1888 | header->root = root; |
29e796fd | 1889 | sysctl_set_parent(NULL, header->ctl_table); |
f7e6ced4 | 1890 | header->count = 1; |
88f458e4 | 1891 | #ifdef CONFIG_SYSCTL_SYSCALL_CHECK |
e51b6ba0 | 1892 | if (sysctl_check_table(namespaces, header->ctl_table)) { |
29e796fd | 1893 | kfree(header); |
fc6cd25b EB |
1894 | return NULL; |
1895 | } | |
88f458e4 | 1896 | #endif |
330d57fb | 1897 | spin_lock(&sysctl_lock); |
73455092 | 1898 | header->set = lookup_header_set(root, namespaces); |
ae7edecc AV |
1899 | header->attached_by = header->ctl_table; |
1900 | header->attached_to = root_table; | |
1901 | header->parent = &root_table_header; | |
1902 | for (set = header->set; set; set = set->parent) { | |
1903 | struct ctl_table_header *p; | |
1904 | list_for_each_entry(p, &set->list, ctl_entry) { | |
1905 | if (p->unregistering) | |
1906 | continue; | |
1907 | try_attach(p, header); | |
1908 | } | |
1909 | } | |
1910 | header->parent->count++; | |
73455092 | 1911 | list_add_tail(&header->ctl_entry, &header->set->list); |
330d57fb | 1912 | spin_unlock(&sysctl_lock); |
29e796fd EB |
1913 | |
1914 | return header; | |
1915 | } | |
1916 | ||
e51b6ba0 EB |
1917 | /** |
1918 | * register_sysctl_table_path - register a sysctl table hierarchy | |
1919 | * @path: The path to the directory the sysctl table is in. | |
1920 | * @table: the top-level table structure | |
1921 | * | |
1922 | * Register a sysctl table hierarchy. @table should be a filled in ctl_table | |
1923 | * array. A completely 0 filled entry terminates the table. | |
1924 | * | |
1925 | * See __register_sysctl_paths for more details. | |
1926 | */ | |
1927 | struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path, | |
1928 | struct ctl_table *table) | |
1929 | { | |
1930 | return __register_sysctl_paths(&sysctl_table_root, current->nsproxy, | |
1931 | path, table); | |
1932 | } | |
1933 | ||
29e796fd EB |
1934 | /** |
1935 | * register_sysctl_table - register a sysctl table hierarchy | |
1936 | * @table: the top-level table structure | |
1937 | * | |
1938 | * Register a sysctl table hierarchy. @table should be a filled in ctl_table | |
1939 | * array. A completely 0 filled entry terminates the table. | |
1940 | * | |
1941 | * See register_sysctl_paths for more details. | |
1942 | */ | |
1943 | struct ctl_table_header *register_sysctl_table(struct ctl_table *table) | |
1944 | { | |
1945 | static const struct ctl_path null_path[] = { {} }; | |
1946 | ||
1947 | return register_sysctl_paths(null_path, table); | |
1da177e4 LT |
1948 | } |
1949 | ||
1950 | /** | |
1951 | * unregister_sysctl_table - unregister a sysctl table hierarchy | |
1952 | * @header: the header returned from register_sysctl_table | |
1953 | * | |
1954 | * Unregisters the sysctl table and all children. proc entries may not | |
1955 | * actually be removed until they are no longer used by anyone. | |
1956 | */ | |
1957 | void unregister_sysctl_table(struct ctl_table_header * header) | |
1958 | { | |
330d57fb | 1959 | might_sleep(); |
f1dad166 PE |
1960 | |
1961 | if (header == NULL) | |
1962 | return; | |
1963 | ||
330d57fb AV |
1964 | spin_lock(&sysctl_lock); |
1965 | start_unregistering(header); | |
ae7edecc AV |
1966 | if (!--header->parent->count) { |
1967 | WARN_ON(1); | |
dfef6dcd | 1968 | call_rcu(&header->parent->rcu, free_head); |
ae7edecc | 1969 | } |
f7e6ced4 | 1970 | if (!--header->count) |
dfef6dcd | 1971 | call_rcu(&header->rcu, free_head); |
330d57fb | 1972 | spin_unlock(&sysctl_lock); |
1da177e4 LT |
1973 | } |
1974 | ||
9043476f AV |
1975 | int sysctl_is_seen(struct ctl_table_header *p) |
1976 | { | |
1977 | struct ctl_table_set *set = p->set; | |
1978 | int res; | |
1979 | spin_lock(&sysctl_lock); | |
1980 | if (p->unregistering) | |
1981 | res = 0; | |
1982 | else if (!set->is_seen) | |
1983 | res = 1; | |
1984 | else | |
1985 | res = set->is_seen(set); | |
1986 | spin_unlock(&sysctl_lock); | |
1987 | return res; | |
1988 | } | |
1989 | ||
73455092 AV |
1990 | void setup_sysctl_set(struct ctl_table_set *p, |
1991 | struct ctl_table_set *parent, | |
1992 | int (*is_seen)(struct ctl_table_set *)) | |
1993 | { | |
1994 | INIT_LIST_HEAD(&p->list); | |
1995 | p->parent = parent ? parent : &sysctl_table_root.default_set; | |
1996 | p->is_seen = is_seen; | |
1997 | } | |
1998 | ||
b89a8171 | 1999 | #else /* !CONFIG_SYSCTL */ |
d8217f07 | 2000 | struct ctl_table_header *register_sysctl_table(struct ctl_table * table) |
b89a8171 EB |
2001 | { |
2002 | return NULL; | |
2003 | } | |
2004 | ||
29e796fd EB |
2005 | struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path, |
2006 | struct ctl_table *table) | |
2007 | { | |
2008 | return NULL; | |
2009 | } | |
2010 | ||
b89a8171 EB |
2011 | void unregister_sysctl_table(struct ctl_table_header * table) |
2012 | { | |
2013 | } | |
2014 | ||
73455092 AV |
2015 | void setup_sysctl_set(struct ctl_table_set *p, |
2016 | struct ctl_table_set *parent, | |
2017 | int (*is_seen)(struct ctl_table_set *)) | |
2018 | { | |
2019 | } | |
2020 | ||
f7e6ced4 AV |
2021 | void sysctl_head_put(struct ctl_table_header *head) |
2022 | { | |
2023 | } | |
2024 | ||
b89a8171 EB |
2025 | #endif /* CONFIG_SYSCTL */ |
2026 | ||
1da177e4 LT |
2027 | /* |
2028 | * /proc/sys support | |
2029 | */ | |
2030 | ||
b89a8171 | 2031 | #ifdef CONFIG_PROC_SYSCTL |
1da177e4 | 2032 | |
b1ba4ddd | 2033 | static int _proc_do_string(void* data, int maxlen, int write, |
8d65af78 | 2034 | void __user *buffer, |
b1ba4ddd | 2035 | size_t *lenp, loff_t *ppos) |
1da177e4 LT |
2036 | { |
2037 | size_t len; | |
2038 | char __user *p; | |
2039 | char c; | |
8d060877 ON |
2040 | |
2041 | if (!data || !maxlen || !*lenp) { | |
1da177e4 LT |
2042 | *lenp = 0; |
2043 | return 0; | |
2044 | } | |
8d060877 | 2045 | |
1da177e4 LT |
2046 | if (write) { |
2047 | len = 0; | |
2048 | p = buffer; | |
2049 | while (len < *lenp) { | |
2050 | if (get_user(c, p++)) | |
2051 | return -EFAULT; | |
2052 | if (c == 0 || c == '\n') | |
2053 | break; | |
2054 | len++; | |
2055 | } | |
f5dd3d6f SV |
2056 | if (len >= maxlen) |
2057 | len = maxlen-1; | |
2058 | if(copy_from_user(data, buffer, len)) | |
1da177e4 | 2059 | return -EFAULT; |
f5dd3d6f | 2060 | ((char *) data)[len] = 0; |
1da177e4 LT |
2061 | *ppos += *lenp; |
2062 | } else { | |
f5dd3d6f SV |
2063 | len = strlen(data); |
2064 | if (len > maxlen) | |
2065 | len = maxlen; | |
8d060877 ON |
2066 | |
2067 | if (*ppos > len) { | |
2068 | *lenp = 0; | |
2069 | return 0; | |
2070 | } | |
2071 | ||
2072 | data += *ppos; | |
2073 | len -= *ppos; | |
2074 | ||
1da177e4 LT |
2075 | if (len > *lenp) |
2076 | len = *lenp; | |
2077 | if (len) | |
f5dd3d6f | 2078 | if(copy_to_user(buffer, data, len)) |
1da177e4 LT |
2079 | return -EFAULT; |
2080 | if (len < *lenp) { | |
2081 | if(put_user('\n', ((char __user *) buffer) + len)) | |
2082 | return -EFAULT; | |
2083 | len++; | |
2084 | } | |
2085 | *lenp = len; | |
2086 | *ppos += len; | |
2087 | } | |
2088 | return 0; | |
2089 | } | |
2090 | ||
f5dd3d6f SV |
2091 | /** |
2092 | * proc_dostring - read a string sysctl | |
2093 | * @table: the sysctl table | |
2094 | * @write: %TRUE if this is a write to the sysctl file | |
f5dd3d6f SV |
2095 | * @buffer: the user buffer |
2096 | * @lenp: the size of the user buffer | |
2097 | * @ppos: file position | |
2098 | * | |
2099 | * Reads/writes a string from/to the user buffer. If the kernel | |
2100 | * buffer provided is not large enough to hold the string, the | |
2101 | * string is truncated. The copied string is %NULL-terminated. | |
2102 | * If the string is being read by the user process, it is copied | |
2103 | * and a newline '\n' is added. It is truncated if the buffer is | |
2104 | * not large enough. | |
2105 | * | |
2106 | * Returns 0 on success. | |
2107 | */ | |
8d65af78 | 2108 | int proc_dostring(struct ctl_table *table, int write, |
f5dd3d6f SV |
2109 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2110 | { | |
8d65af78 | 2111 | return _proc_do_string(table->data, table->maxlen, write, |
f5dd3d6f SV |
2112 | buffer, lenp, ppos); |
2113 | } | |
2114 | ||
00b7c339 AW |
2115 | static size_t proc_skip_spaces(char **buf) |
2116 | { | |
2117 | size_t ret; | |
2118 | char *tmp = skip_spaces(*buf); | |
2119 | ret = tmp - *buf; | |
2120 | *buf = tmp; | |
2121 | return ret; | |
2122 | } | |
2123 | ||
9f977fb7 OP |
2124 | static void proc_skip_char(char **buf, size_t *size, const char v) |
2125 | { | |
2126 | while (*size) { | |
2127 | if (**buf != v) | |
2128 | break; | |
2129 | (*size)--; | |
2130 | (*buf)++; | |
2131 | } | |
2132 | } | |
2133 | ||
00b7c339 AW |
2134 | #define TMPBUFLEN 22 |
2135 | /** | |
0fc377bd | 2136 | * proc_get_long - reads an ASCII formatted integer from a user buffer |
00b7c339 | 2137 | * |
0fc377bd RD |
2138 | * @buf: a kernel buffer |
2139 | * @size: size of the kernel buffer | |
2140 | * @val: this is where the number will be stored | |
2141 | * @neg: set to %TRUE if number is negative | |
2142 | * @perm_tr: a vector which contains the allowed trailers | |
2143 | * @perm_tr_len: size of the perm_tr vector | |
2144 | * @tr: pointer to store the trailer character | |
00b7c339 | 2145 | * |
0fc377bd RD |
2146 | * In case of success %0 is returned and @buf and @size are updated with |
2147 | * the amount of bytes read. If @tr is non-NULL and a trailing | |
2148 | * character exists (size is non-zero after returning from this | |
2149 | * function), @tr is updated with the trailing character. | |
00b7c339 AW |
2150 | */ |
2151 | static int proc_get_long(char **buf, size_t *size, | |
2152 | unsigned long *val, bool *neg, | |
2153 | const char *perm_tr, unsigned perm_tr_len, char *tr) | |
2154 | { | |
2155 | int len; | |
2156 | char *p, tmp[TMPBUFLEN]; | |
2157 | ||
2158 | if (!*size) | |
2159 | return -EINVAL; | |
2160 | ||
2161 | len = *size; | |
2162 | if (len > TMPBUFLEN - 1) | |
2163 | len = TMPBUFLEN - 1; | |
2164 | ||
2165 | memcpy(tmp, *buf, len); | |
2166 | ||
2167 | tmp[len] = 0; | |
2168 | p = tmp; | |
2169 | if (*p == '-' && *size > 1) { | |
2170 | *neg = true; | |
2171 | p++; | |
2172 | } else | |
2173 | *neg = false; | |
2174 | if (!isdigit(*p)) | |
2175 | return -EINVAL; | |
2176 | ||
2177 | *val = simple_strtoul(p, &p, 0); | |
2178 | ||
2179 | len = p - tmp; | |
2180 | ||
2181 | /* We don't know if the next char is whitespace thus we may accept | |
2182 | * invalid integers (e.g. 1234...a) or two integers instead of one | |
2183 | * (e.g. 123...1). So lets not allow such large numbers. */ | |
2184 | if (len == TMPBUFLEN - 1) | |
2185 | return -EINVAL; | |
2186 | ||
2187 | if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len)) | |
2188 | return -EINVAL; | |
1da177e4 | 2189 | |
00b7c339 AW |
2190 | if (tr && (len < *size)) |
2191 | *tr = *p; | |
2192 | ||
2193 | *buf += len; | |
2194 | *size -= len; | |
2195 | ||
2196 | return 0; | |
2197 | } | |
2198 | ||
2199 | /** | |
0fc377bd | 2200 | * proc_put_long - converts an integer to a decimal ASCII formatted string |
00b7c339 | 2201 | * |
0fc377bd RD |
2202 | * @buf: the user buffer |
2203 | * @size: the size of the user buffer | |
2204 | * @val: the integer to be converted | |
2205 | * @neg: sign of the number, %TRUE for negative | |
00b7c339 | 2206 | * |
0fc377bd RD |
2207 | * In case of success %0 is returned and @buf and @size are updated with |
2208 | * the amount of bytes written. | |
00b7c339 AW |
2209 | */ |
2210 | static int proc_put_long(void __user **buf, size_t *size, unsigned long val, | |
2211 | bool neg) | |
2212 | { | |
2213 | int len; | |
2214 | char tmp[TMPBUFLEN], *p = tmp; | |
2215 | ||
2216 | sprintf(p, "%s%lu", neg ? "-" : "", val); | |
2217 | len = strlen(tmp); | |
2218 | if (len > *size) | |
2219 | len = *size; | |
2220 | if (copy_to_user(*buf, tmp, len)) | |
2221 | return -EFAULT; | |
2222 | *size -= len; | |
2223 | *buf += len; | |
2224 | return 0; | |
2225 | } | |
2226 | #undef TMPBUFLEN | |
2227 | ||
2228 | static int proc_put_char(void __user **buf, size_t *size, char c) | |
2229 | { | |
2230 | if (*size) { | |
2231 | char __user **buffer = (char __user **)buf; | |
2232 | if (put_user(c, *buffer)) | |
2233 | return -EFAULT; | |
2234 | (*size)--, (*buffer)++; | |
2235 | *buf = *buffer; | |
2236 | } | |
2237 | return 0; | |
2238 | } | |
1da177e4 | 2239 | |
00b7c339 | 2240 | static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp, |
1da177e4 LT |
2241 | int *valp, |
2242 | int write, void *data) | |
2243 | { | |
2244 | if (write) { | |
2245 | *valp = *negp ? -*lvalp : *lvalp; | |
2246 | } else { | |
2247 | int val = *valp; | |
2248 | if (val < 0) { | |
00b7c339 | 2249 | *negp = true; |
1da177e4 LT |
2250 | *lvalp = (unsigned long)-val; |
2251 | } else { | |
00b7c339 | 2252 | *negp = false; |
1da177e4 LT |
2253 | *lvalp = (unsigned long)val; |
2254 | } | |
2255 | } | |
2256 | return 0; | |
2257 | } | |
2258 | ||
00b7c339 AW |
2259 | static const char proc_wspace_sep[] = { ' ', '\t', '\n' }; |
2260 | ||
d8217f07 | 2261 | static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table, |
8d65af78 | 2262 | int write, void __user *buffer, |
fcfbd547 | 2263 | size_t *lenp, loff_t *ppos, |
00b7c339 | 2264 | int (*conv)(bool *negp, unsigned long *lvalp, int *valp, |
1da177e4 LT |
2265 | int write, void *data), |
2266 | void *data) | |
2267 | { | |
00b7c339 AW |
2268 | int *i, vleft, first = 1, err = 0; |
2269 | unsigned long page = 0; | |
2270 | size_t left; | |
2271 | char *kbuf; | |
1da177e4 | 2272 | |
00b7c339 | 2273 | if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) { |
1da177e4 LT |
2274 | *lenp = 0; |
2275 | return 0; | |
2276 | } | |
2277 | ||
fcfbd547 | 2278 | i = (int *) tbl_data; |
1da177e4 LT |
2279 | vleft = table->maxlen / sizeof(*i); |
2280 | left = *lenp; | |
2281 | ||
2282 | if (!conv) | |
2283 | conv = do_proc_dointvec_conv; | |
2284 | ||
00b7c339 AW |
2285 | if (write) { |
2286 | if (left > PAGE_SIZE - 1) | |
2287 | left = PAGE_SIZE - 1; | |
2288 | page = __get_free_page(GFP_TEMPORARY); | |
2289 | kbuf = (char *) page; | |
2290 | if (!kbuf) | |
2291 | return -ENOMEM; | |
2292 | if (copy_from_user(kbuf, buffer, left)) { | |
2293 | err = -EFAULT; | |
2294 | goto free; | |
2295 | } | |
2296 | kbuf[left] = 0; | |
2297 | } | |
2298 | ||
1da177e4 | 2299 | for (; left && vleft--; i++, first=0) { |
00b7c339 AW |
2300 | unsigned long lval; |
2301 | bool neg; | |
1da177e4 | 2302 | |
00b7c339 AW |
2303 | if (write) { |
2304 | left -= proc_skip_spaces(&kbuf); | |
1da177e4 | 2305 | |
563b0467 O |
2306 | if (!left) |
2307 | break; | |
00b7c339 AW |
2308 | err = proc_get_long(&kbuf, &left, &lval, &neg, |
2309 | proc_wspace_sep, | |
2310 | sizeof(proc_wspace_sep), NULL); | |
2311 | if (err) | |
1da177e4 | 2312 | break; |
00b7c339 AW |
2313 | if (conv(&neg, &lval, i, 1, data)) { |
2314 | err = -EINVAL; | |
1da177e4 | 2315 | break; |
00b7c339 | 2316 | } |
1da177e4 | 2317 | } else { |
00b7c339 AW |
2318 | if (conv(&neg, &lval, i, 0, data)) { |
2319 | err = -EINVAL; | |
2320 | break; | |
2321 | } | |
1da177e4 | 2322 | if (!first) |
00b7c339 AW |
2323 | err = proc_put_char(&buffer, &left, '\t'); |
2324 | if (err) | |
2325 | break; | |
2326 | err = proc_put_long(&buffer, &left, lval, neg); | |
2327 | if (err) | |
1da177e4 | 2328 | break; |
1da177e4 LT |
2329 | } |
2330 | } | |
2331 | ||
00b7c339 AW |
2332 | if (!write && !first && left && !err) |
2333 | err = proc_put_char(&buffer, &left, '\n'); | |
563b0467 | 2334 | if (write && !err && left) |
00b7c339 AW |
2335 | left -= proc_skip_spaces(&kbuf); |
2336 | free: | |
1da177e4 | 2337 | if (write) { |
00b7c339 AW |
2338 | free_page(page); |
2339 | if (first) | |
2340 | return err ? : -EINVAL; | |
1da177e4 | 2341 | } |
1da177e4 LT |
2342 | *lenp -= left; |
2343 | *ppos += *lenp; | |
00b7c339 | 2344 | return err; |
1da177e4 LT |
2345 | } |
2346 | ||
8d65af78 | 2347 | static int do_proc_dointvec(struct ctl_table *table, int write, |
fcfbd547 | 2348 | void __user *buffer, size_t *lenp, loff_t *ppos, |
00b7c339 | 2349 | int (*conv)(bool *negp, unsigned long *lvalp, int *valp, |
fcfbd547 KK |
2350 | int write, void *data), |
2351 | void *data) | |
2352 | { | |
8d65af78 | 2353 | return __do_proc_dointvec(table->data, table, write, |
fcfbd547 KK |
2354 | buffer, lenp, ppos, conv, data); |
2355 | } | |
2356 | ||
1da177e4 LT |
2357 | /** |
2358 | * proc_dointvec - read a vector of integers | |
2359 | * @table: the sysctl table | |
2360 | * @write: %TRUE if this is a write to the sysctl file | |
1da177e4 LT |
2361 | * @buffer: the user buffer |
2362 | * @lenp: the size of the user buffer | |
2363 | * @ppos: file position | |
2364 | * | |
2365 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer | |
2366 | * values from/to the user buffer, treated as an ASCII string. | |
2367 | * | |
2368 | * Returns 0 on success. | |
2369 | */ | |
8d65af78 | 2370 | int proc_dointvec(struct ctl_table *table, int write, |
1da177e4 LT |
2371 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2372 | { | |
8d65af78 | 2373 | return do_proc_dointvec(table,write,buffer,lenp,ppos, |
1da177e4 LT |
2374 | NULL,NULL); |
2375 | } | |
2376 | ||
34f5a398 | 2377 | /* |
25ddbb18 AK |
2378 | * Taint values can only be increased |
2379 | * This means we can safely use a temporary. | |
34f5a398 | 2380 | */ |
8d65af78 | 2381 | static int proc_taint(struct ctl_table *table, int write, |
34f5a398 TT |
2382 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2383 | { | |
25ddbb18 AK |
2384 | struct ctl_table t; |
2385 | unsigned long tmptaint = get_taint(); | |
2386 | int err; | |
34f5a398 | 2387 | |
91fcd412 | 2388 | if (write && !capable(CAP_SYS_ADMIN)) |
34f5a398 TT |
2389 | return -EPERM; |
2390 | ||
25ddbb18 AK |
2391 | t = *table; |
2392 | t.data = &tmptaint; | |
8d65af78 | 2393 | err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos); |
25ddbb18 AK |
2394 | if (err < 0) |
2395 | return err; | |
2396 | ||
2397 | if (write) { | |
2398 | /* | |
2399 | * Poor man's atomic or. Not worth adding a primitive | |
2400 | * to everyone's atomic.h for this | |
2401 | */ | |
2402 | int i; | |
2403 | for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) { | |
2404 | if ((tmptaint >> i) & 1) | |
2405 | add_taint(i); | |
2406 | } | |
2407 | } | |
2408 | ||
2409 | return err; | |
34f5a398 TT |
2410 | } |
2411 | ||
bfdc0b49 RW |
2412 | #ifdef CONFIG_PRINTK |
2413 | static int proc_dmesg_restrict(struct ctl_table *table, int write, | |
2414 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2415 | { | |
2416 | if (write && !capable(CAP_SYS_ADMIN)) | |
2417 | return -EPERM; | |
2418 | ||
2419 | return proc_dointvec_minmax(table, write, buffer, lenp, ppos); | |
2420 | } | |
2421 | #endif | |
2422 | ||
1da177e4 LT |
2423 | struct do_proc_dointvec_minmax_conv_param { |
2424 | int *min; | |
2425 | int *max; | |
2426 | }; | |
2427 | ||
00b7c339 AW |
2428 | static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp, |
2429 | int *valp, | |
1da177e4 LT |
2430 | int write, void *data) |
2431 | { | |
2432 | struct do_proc_dointvec_minmax_conv_param *param = data; | |
2433 | if (write) { | |
2434 | int val = *negp ? -*lvalp : *lvalp; | |
2435 | if ((param->min && *param->min > val) || | |
2436 | (param->max && *param->max < val)) | |
2437 | return -EINVAL; | |
2438 | *valp = val; | |
2439 | } else { | |
2440 | int val = *valp; | |
2441 | if (val < 0) { | |
00b7c339 | 2442 | *negp = true; |
1da177e4 LT |
2443 | *lvalp = (unsigned long)-val; |
2444 | } else { | |
00b7c339 | 2445 | *negp = false; |
1da177e4 LT |
2446 | *lvalp = (unsigned long)val; |
2447 | } | |
2448 | } | |
2449 | return 0; | |
2450 | } | |
2451 | ||
2452 | /** | |
2453 | * proc_dointvec_minmax - read a vector of integers with min/max values | |
2454 | * @table: the sysctl table | |
2455 | * @write: %TRUE if this is a write to the sysctl file | |
1da177e4 LT |
2456 | * @buffer: the user buffer |
2457 | * @lenp: the size of the user buffer | |
2458 | * @ppos: file position | |
2459 | * | |
2460 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer | |
2461 | * values from/to the user buffer, treated as an ASCII string. | |
2462 | * | |
2463 | * This routine will ensure the values are within the range specified by | |
2464 | * table->extra1 (min) and table->extra2 (max). | |
2465 | * | |
2466 | * Returns 0 on success. | |
2467 | */ | |
8d65af78 | 2468 | int proc_dointvec_minmax(struct ctl_table *table, int write, |
1da177e4 LT |
2469 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2470 | { | |
2471 | struct do_proc_dointvec_minmax_conv_param param = { | |
2472 | .min = (int *) table->extra1, | |
2473 | .max = (int *) table->extra2, | |
2474 | }; | |
8d65af78 | 2475 | return do_proc_dointvec(table, write, buffer, lenp, ppos, |
1da177e4 LT |
2476 | do_proc_dointvec_minmax_conv, ¶m); |
2477 | } | |
2478 | ||
d8217f07 | 2479 | static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write, |
1da177e4 LT |
2480 | void __user *buffer, |
2481 | size_t *lenp, loff_t *ppos, | |
2482 | unsigned long convmul, | |
2483 | unsigned long convdiv) | |
2484 | { | |
00b7c339 AW |
2485 | unsigned long *i, *min, *max; |
2486 | int vleft, first = 1, err = 0; | |
2487 | unsigned long page = 0; | |
2488 | size_t left; | |
2489 | char *kbuf; | |
2490 | ||
2491 | if (!data || !table->maxlen || !*lenp || (*ppos && !write)) { | |
1da177e4 LT |
2492 | *lenp = 0; |
2493 | return 0; | |
2494 | } | |
00b7c339 | 2495 | |
fcfbd547 | 2496 | i = (unsigned long *) data; |
1da177e4 LT |
2497 | min = (unsigned long *) table->extra1; |
2498 | max = (unsigned long *) table->extra2; | |
2499 | vleft = table->maxlen / sizeof(unsigned long); | |
2500 | left = *lenp; | |
00b7c339 AW |
2501 | |
2502 | if (write) { | |
2503 | if (left > PAGE_SIZE - 1) | |
2504 | left = PAGE_SIZE - 1; | |
2505 | page = __get_free_page(GFP_TEMPORARY); | |
2506 | kbuf = (char *) page; | |
2507 | if (!kbuf) | |
2508 | return -ENOMEM; | |
2509 | if (copy_from_user(kbuf, buffer, left)) { | |
2510 | err = -EFAULT; | |
2511 | goto free; | |
2512 | } | |
2513 | kbuf[left] = 0; | |
2514 | } | |
2515 | ||
27b3d80a | 2516 | for (; left && vleft--; i++, first = 0) { |
00b7c339 AW |
2517 | unsigned long val; |
2518 | ||
1da177e4 | 2519 | if (write) { |
00b7c339 AW |
2520 | bool neg; |
2521 | ||
2522 | left -= proc_skip_spaces(&kbuf); | |
2523 | ||
2524 | err = proc_get_long(&kbuf, &left, &val, &neg, | |
2525 | proc_wspace_sep, | |
2526 | sizeof(proc_wspace_sep), NULL); | |
2527 | if (err) | |
1da177e4 LT |
2528 | break; |
2529 | if (neg) | |
1da177e4 LT |
2530 | continue; |
2531 | if ((min && val < *min) || (max && val > *max)) | |
2532 | continue; | |
2533 | *i = val; | |
2534 | } else { | |
00b7c339 | 2535 | val = convdiv * (*i) / convmul; |
1da177e4 | 2536 | if (!first) |
00b7c339 AW |
2537 | err = proc_put_char(&buffer, &left, '\t'); |
2538 | err = proc_put_long(&buffer, &left, val, false); | |
2539 | if (err) | |
2540 | break; | |
1da177e4 LT |
2541 | } |
2542 | } | |
2543 | ||
00b7c339 AW |
2544 | if (!write && !first && left && !err) |
2545 | err = proc_put_char(&buffer, &left, '\n'); | |
2546 | if (write && !err) | |
2547 | left -= proc_skip_spaces(&kbuf); | |
2548 | free: | |
1da177e4 | 2549 | if (write) { |
00b7c339 AW |
2550 | free_page(page); |
2551 | if (first) | |
2552 | return err ? : -EINVAL; | |
1da177e4 | 2553 | } |
1da177e4 LT |
2554 | *lenp -= left; |
2555 | *ppos += *lenp; | |
00b7c339 | 2556 | return err; |
1da177e4 LT |
2557 | } |
2558 | ||
d8217f07 | 2559 | static int do_proc_doulongvec_minmax(struct ctl_table *table, int write, |
fcfbd547 KK |
2560 | void __user *buffer, |
2561 | size_t *lenp, loff_t *ppos, | |
2562 | unsigned long convmul, | |
2563 | unsigned long convdiv) | |
2564 | { | |
2565 | return __do_proc_doulongvec_minmax(table->data, table, write, | |
8d65af78 | 2566 | buffer, lenp, ppos, convmul, convdiv); |
fcfbd547 KK |
2567 | } |
2568 | ||
1da177e4 LT |
2569 | /** |
2570 | * proc_doulongvec_minmax - read a vector of long integers with min/max values | |
2571 | * @table: the sysctl table | |
2572 | * @write: %TRUE if this is a write to the sysctl file | |
1da177e4 LT |
2573 | * @buffer: the user buffer |
2574 | * @lenp: the size of the user buffer | |
2575 | * @ppos: file position | |
2576 | * | |
2577 | * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long | |
2578 | * values from/to the user buffer, treated as an ASCII string. | |
2579 | * | |
2580 | * This routine will ensure the values are within the range specified by | |
2581 | * table->extra1 (min) and table->extra2 (max). | |
2582 | * | |
2583 | * Returns 0 on success. | |
2584 | */ | |
8d65af78 | 2585 | int proc_doulongvec_minmax(struct ctl_table *table, int write, |
1da177e4 LT |
2586 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2587 | { | |
8d65af78 | 2588 | return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l); |
1da177e4 LT |
2589 | } |
2590 | ||
2591 | /** | |
2592 | * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values | |
2593 | * @table: the sysctl table | |
2594 | * @write: %TRUE if this is a write to the sysctl file | |
1da177e4 LT |
2595 | * @buffer: the user buffer |
2596 | * @lenp: the size of the user buffer | |
2597 | * @ppos: file position | |
2598 | * | |
2599 | * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long | |
2600 | * values from/to the user buffer, treated as an ASCII string. The values | |
2601 | * are treated as milliseconds, and converted to jiffies when they are stored. | |
2602 | * | |
2603 | * This routine will ensure the values are within the range specified by | |
2604 | * table->extra1 (min) and table->extra2 (max). | |
2605 | * | |
2606 | * Returns 0 on success. | |
2607 | */ | |
d8217f07 | 2608 | int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, |
1da177e4 LT |
2609 | void __user *buffer, |
2610 | size_t *lenp, loff_t *ppos) | |
2611 | { | |
8d65af78 | 2612 | return do_proc_doulongvec_minmax(table, write, buffer, |
1da177e4 LT |
2613 | lenp, ppos, HZ, 1000l); |
2614 | } | |
2615 | ||
2616 | ||
00b7c339 | 2617 | static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp, |
1da177e4 LT |
2618 | int *valp, |
2619 | int write, void *data) | |
2620 | { | |
2621 | if (write) { | |
cba9f33d BS |
2622 | if (*lvalp > LONG_MAX / HZ) |
2623 | return 1; | |
1da177e4 LT |
2624 | *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ); |
2625 | } else { | |
2626 | int val = *valp; | |
2627 | unsigned long lval; | |
2628 | if (val < 0) { | |
00b7c339 | 2629 | *negp = true; |
1da177e4 LT |
2630 | lval = (unsigned long)-val; |
2631 | } else { | |
00b7c339 | 2632 | *negp = false; |
1da177e4 LT |
2633 | lval = (unsigned long)val; |
2634 | } | |
2635 | *lvalp = lval / HZ; | |
2636 | } | |
2637 | return 0; | |
2638 | } | |
2639 | ||
00b7c339 | 2640 | static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp, |
1da177e4 LT |
2641 | int *valp, |
2642 | int write, void *data) | |
2643 | { | |
2644 | if (write) { | |
cba9f33d BS |
2645 | if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ) |
2646 | return 1; | |
1da177e4 LT |
2647 | *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp); |
2648 | } else { | |
2649 | int val = *valp; | |
2650 | unsigned long lval; | |
2651 | if (val < 0) { | |
00b7c339 | 2652 | *negp = true; |
1da177e4 LT |
2653 | lval = (unsigned long)-val; |
2654 | } else { | |
00b7c339 | 2655 | *negp = false; |
1da177e4 LT |
2656 | lval = (unsigned long)val; |
2657 | } | |
2658 | *lvalp = jiffies_to_clock_t(lval); | |
2659 | } | |
2660 | return 0; | |
2661 | } | |
2662 | ||
00b7c339 | 2663 | static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp, |
1da177e4 LT |
2664 | int *valp, |
2665 | int write, void *data) | |
2666 | { | |
2667 | if (write) { | |
2668 | *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp); | |
2669 | } else { | |
2670 | int val = *valp; | |
2671 | unsigned long lval; | |
2672 | if (val < 0) { | |
00b7c339 | 2673 | *negp = true; |
1da177e4 LT |
2674 | lval = (unsigned long)-val; |
2675 | } else { | |
00b7c339 | 2676 | *negp = false; |
1da177e4 LT |
2677 | lval = (unsigned long)val; |
2678 | } | |
2679 | *lvalp = jiffies_to_msecs(lval); | |
2680 | } | |
2681 | return 0; | |
2682 | } | |
2683 | ||
2684 | /** | |
2685 | * proc_dointvec_jiffies - read a vector of integers as seconds | |
2686 | * @table: the sysctl table | |
2687 | * @write: %TRUE if this is a write to the sysctl file | |
1da177e4 LT |
2688 | * @buffer: the user buffer |
2689 | * @lenp: the size of the user buffer | |
2690 | * @ppos: file position | |
2691 | * | |
2692 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer | |
2693 | * values from/to the user buffer, treated as an ASCII string. | |
2694 | * The values read are assumed to be in seconds, and are converted into | |
2695 | * jiffies. | |
2696 | * | |
2697 | * Returns 0 on success. | |
2698 | */ | |
8d65af78 | 2699 | int proc_dointvec_jiffies(struct ctl_table *table, int write, |
1da177e4 LT |
2700 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2701 | { | |
8d65af78 | 2702 | return do_proc_dointvec(table,write,buffer,lenp,ppos, |
1da177e4 LT |
2703 | do_proc_dointvec_jiffies_conv,NULL); |
2704 | } | |
2705 | ||
2706 | /** | |
2707 | * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds | |
2708 | * @table: the sysctl table | |
2709 | * @write: %TRUE if this is a write to the sysctl file | |
1da177e4 LT |
2710 | * @buffer: the user buffer |
2711 | * @lenp: the size of the user buffer | |
1e5d5331 | 2712 | * @ppos: pointer to the file position |
1da177e4 LT |
2713 | * |
2714 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer | |
2715 | * values from/to the user buffer, treated as an ASCII string. | |
2716 | * The values read are assumed to be in 1/USER_HZ seconds, and | |
2717 | * are converted into jiffies. | |
2718 | * | |
2719 | * Returns 0 on success. | |
2720 | */ | |
8d65af78 | 2721 | int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, |
1da177e4 LT |
2722 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2723 | { | |
8d65af78 | 2724 | return do_proc_dointvec(table,write,buffer,lenp,ppos, |
1da177e4 LT |
2725 | do_proc_dointvec_userhz_jiffies_conv,NULL); |
2726 | } | |
2727 | ||
2728 | /** | |
2729 | * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds | |
2730 | * @table: the sysctl table | |
2731 | * @write: %TRUE if this is a write to the sysctl file | |
1da177e4 LT |
2732 | * @buffer: the user buffer |
2733 | * @lenp: the size of the user buffer | |
67be2dd1 MW |
2734 | * @ppos: file position |
2735 | * @ppos: the current position in the file | |
1da177e4 LT |
2736 | * |
2737 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer | |
2738 | * values from/to the user buffer, treated as an ASCII string. | |
2739 | * The values read are assumed to be in 1/1000 seconds, and | |
2740 | * are converted into jiffies. | |
2741 | * | |
2742 | * Returns 0 on success. | |
2743 | */ | |
8d65af78 | 2744 | int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, |
1da177e4 LT |
2745 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2746 | { | |
8d65af78 | 2747 | return do_proc_dointvec(table, write, buffer, lenp, ppos, |
1da177e4 LT |
2748 | do_proc_dointvec_ms_jiffies_conv, NULL); |
2749 | } | |
2750 | ||
8d65af78 | 2751 | static int proc_do_cad_pid(struct ctl_table *table, int write, |
9ec52099 CLG |
2752 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2753 | { | |
2754 | struct pid *new_pid; | |
2755 | pid_t tmp; | |
2756 | int r; | |
2757 | ||
6c5f3e7b | 2758 | tmp = pid_vnr(cad_pid); |
9ec52099 | 2759 | |
8d65af78 | 2760 | r = __do_proc_dointvec(&tmp, table, write, buffer, |
9ec52099 CLG |
2761 | lenp, ppos, NULL, NULL); |
2762 | if (r || !write) | |
2763 | return r; | |
2764 | ||
2765 | new_pid = find_get_pid(tmp); | |
2766 | if (!new_pid) | |
2767 | return -ESRCH; | |
2768 | ||
2769 | put_pid(xchg(&cad_pid, new_pid)); | |
2770 | return 0; | |
2771 | } | |
2772 | ||
9f977fb7 OP |
2773 | /** |
2774 | * proc_do_large_bitmap - read/write from/to a large bitmap | |
2775 | * @table: the sysctl table | |
2776 | * @write: %TRUE if this is a write to the sysctl file | |
2777 | * @buffer: the user buffer | |
2778 | * @lenp: the size of the user buffer | |
2779 | * @ppos: file position | |
2780 | * | |
2781 | * The bitmap is stored at table->data and the bitmap length (in bits) | |
2782 | * in table->maxlen. | |
2783 | * | |
2784 | * We use a range comma separated format (e.g. 1,3-4,10-10) so that | |
2785 | * large bitmaps may be represented in a compact manner. Writing into | |
2786 | * the file will clear the bitmap then update it with the given input. | |
2787 | * | |
2788 | * Returns 0 on success. | |
2789 | */ | |
2790 | int proc_do_large_bitmap(struct ctl_table *table, int write, | |
2791 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2792 | { | |
2793 | int err = 0; | |
2794 | bool first = 1; | |
2795 | size_t left = *lenp; | |
2796 | unsigned long bitmap_len = table->maxlen; | |
2797 | unsigned long *bitmap = (unsigned long *) table->data; | |
2798 | unsigned long *tmp_bitmap = NULL; | |
2799 | char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c; | |
2800 | ||
2801 | if (!bitmap_len || !left || (*ppos && !write)) { | |
2802 | *lenp = 0; | |
2803 | return 0; | |
2804 | } | |
2805 | ||
2806 | if (write) { | |
2807 | unsigned long page = 0; | |
2808 | char *kbuf; | |
2809 | ||
2810 | if (left > PAGE_SIZE - 1) | |
2811 | left = PAGE_SIZE - 1; | |
2812 | ||
2813 | page = __get_free_page(GFP_TEMPORARY); | |
2814 | kbuf = (char *) page; | |
2815 | if (!kbuf) | |
2816 | return -ENOMEM; | |
2817 | if (copy_from_user(kbuf, buffer, left)) { | |
2818 | free_page(page); | |
2819 | return -EFAULT; | |
2820 | } | |
2821 | kbuf[left] = 0; | |
2822 | ||
2823 | tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long), | |
2824 | GFP_KERNEL); | |
2825 | if (!tmp_bitmap) { | |
2826 | free_page(page); | |
2827 | return -ENOMEM; | |
2828 | } | |
2829 | proc_skip_char(&kbuf, &left, '\n'); | |
2830 | while (!err && left) { | |
2831 | unsigned long val_a, val_b; | |
2832 | bool neg; | |
2833 | ||
2834 | err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a, | |
2835 | sizeof(tr_a), &c); | |
2836 | if (err) | |
2837 | break; | |
2838 | if (val_a >= bitmap_len || neg) { | |
2839 | err = -EINVAL; | |
2840 | break; | |
2841 | } | |
2842 | ||
2843 | val_b = val_a; | |
2844 | if (left) { | |
2845 | kbuf++; | |
2846 | left--; | |
2847 | } | |
2848 | ||
2849 | if (c == '-') { | |
2850 | err = proc_get_long(&kbuf, &left, &val_b, | |
2851 | &neg, tr_b, sizeof(tr_b), | |
2852 | &c); | |
2853 | if (err) | |
2854 | break; | |
2855 | if (val_b >= bitmap_len || neg || | |
2856 | val_a > val_b) { | |
2857 | err = -EINVAL; | |
2858 | break; | |
2859 | } | |
2860 | if (left) { | |
2861 | kbuf++; | |
2862 | left--; | |
2863 | } | |
2864 | } | |
2865 | ||
2866 | while (val_a <= val_b) | |
2867 | set_bit(val_a++, tmp_bitmap); | |
2868 | ||
2869 | first = 0; | |
2870 | proc_skip_char(&kbuf, &left, '\n'); | |
2871 | } | |
2872 | free_page(page); | |
2873 | } else { | |
2874 | unsigned long bit_a, bit_b = 0; | |
2875 | ||
2876 | while (left) { | |
2877 | bit_a = find_next_bit(bitmap, bitmap_len, bit_b); | |
2878 | if (bit_a >= bitmap_len) | |
2879 | break; | |
2880 | bit_b = find_next_zero_bit(bitmap, bitmap_len, | |
2881 | bit_a + 1) - 1; | |
2882 | ||
2883 | if (!first) { | |
2884 | err = proc_put_char(&buffer, &left, ','); | |
2885 | if (err) | |
2886 | break; | |
2887 | } | |
2888 | err = proc_put_long(&buffer, &left, bit_a, false); | |
2889 | if (err) | |
2890 | break; | |
2891 | if (bit_a != bit_b) { | |
2892 | err = proc_put_char(&buffer, &left, '-'); | |
2893 | if (err) | |
2894 | break; | |
2895 | err = proc_put_long(&buffer, &left, bit_b, false); | |
2896 | if (err) | |
2897 | break; | |
2898 | } | |
2899 | ||
2900 | first = 0; bit_b++; | |
2901 | } | |
2902 | if (!err) | |
2903 | err = proc_put_char(&buffer, &left, '\n'); | |
2904 | } | |
2905 | ||
2906 | if (!err) { | |
2907 | if (write) { | |
2908 | if (*ppos) | |
2909 | bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len); | |
2910 | else | |
2911 | memcpy(bitmap, tmp_bitmap, | |
2912 | BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long)); | |
2913 | } | |
2914 | kfree(tmp_bitmap); | |
2915 | *lenp -= left; | |
2916 | *ppos += *lenp; | |
2917 | return 0; | |
2918 | } else { | |
2919 | kfree(tmp_bitmap); | |
2920 | return err; | |
2921 | } | |
2922 | } | |
2923 | ||
55610500 | 2924 | #else /* CONFIG_PROC_SYSCTL */ |
1da177e4 | 2925 | |
8d65af78 | 2926 | int proc_dostring(struct ctl_table *table, int write, |
1da177e4 LT |
2927 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2928 | { | |
2929 | return -ENOSYS; | |
2930 | } | |
2931 | ||
8d65af78 | 2932 | int proc_dointvec(struct ctl_table *table, int write, |
1da177e4 | 2933 | void __user *buffer, size_t *lenp, loff_t *ppos) |
1da177e4 LT |
2934 | { |
2935 | return -ENOSYS; | |
2936 | } | |
2937 | ||
8d65af78 | 2938 | int proc_dointvec_minmax(struct ctl_table *table, int write, |
1da177e4 LT |
2939 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2940 | { | |
2941 | return -ENOSYS; | |
2942 | } | |
2943 | ||
8d65af78 | 2944 | int proc_dointvec_jiffies(struct ctl_table *table, int write, |
1da177e4 LT |
2945 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2946 | { | |
2947 | return -ENOSYS; | |
2948 | } | |
2949 | ||
8d65af78 | 2950 | int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, |
1da177e4 LT |
2951 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2952 | { | |
2953 | return -ENOSYS; | |
2954 | } | |
2955 | ||
8d65af78 | 2956 | int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, |
1da177e4 LT |
2957 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2958 | { | |
2959 | return -ENOSYS; | |
2960 | } | |
2961 | ||
8d65af78 | 2962 | int proc_doulongvec_minmax(struct ctl_table *table, int write, |
1da177e4 LT |
2963 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2964 | { | |
2965 | return -ENOSYS; | |
2966 | } | |
2967 | ||
d8217f07 | 2968 | int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, |
1da177e4 LT |
2969 | void __user *buffer, |
2970 | size_t *lenp, loff_t *ppos) | |
2971 | { | |
2972 | return -ENOSYS; | |
2973 | } | |
2974 | ||
2975 | ||
55610500 | 2976 | #endif /* CONFIG_PROC_SYSCTL */ |
1da177e4 | 2977 | |
1da177e4 LT |
2978 | /* |
2979 | * No sense putting this after each symbol definition, twice, | |
2980 | * exception granted :-) | |
2981 | */ | |
2982 | EXPORT_SYMBOL(proc_dointvec); | |
2983 | EXPORT_SYMBOL(proc_dointvec_jiffies); | |
2984 | EXPORT_SYMBOL(proc_dointvec_minmax); | |
2985 | EXPORT_SYMBOL(proc_dointvec_userhz_jiffies); | |
2986 | EXPORT_SYMBOL(proc_dointvec_ms_jiffies); | |
2987 | EXPORT_SYMBOL(proc_dostring); | |
2988 | EXPORT_SYMBOL(proc_doulongvec_minmax); | |
2989 | EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax); | |
2990 | EXPORT_SYMBOL(register_sysctl_table); | |
29e796fd | 2991 | EXPORT_SYMBOL(register_sysctl_paths); |
1da177e4 | 2992 | EXPORT_SYMBOL(unregister_sysctl_table); |