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1da177e4 LT |
1 | /* |
2 | * sysctl.c: General linux system control interface | |
3 | * | |
4 | * Begun 24 March 1995, Stephen Tweedie | |
5 | * Added /proc support, Dec 1995 | |
6 | * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas. | |
7 | * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver. | |
8 | * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver. | |
9 | * Dynamic registration fixes, Stephen Tweedie. | |
10 | * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn. | |
11 | * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris | |
12 | * Horn. | |
13 | * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer. | |
14 | * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer. | |
15 | * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill | |
16 | * Wendling. | |
17 | * The list_for_each() macro wasn't appropriate for the sysctl loop. | |
18 | * Removed it and replaced it with older style, 03/23/00, Bill Wendling | |
19 | */ | |
20 | ||
1da177e4 LT |
21 | #include <linux/module.h> |
22 | #include <linux/mm.h> | |
23 | #include <linux/swap.h> | |
24 | #include <linux/slab.h> | |
25 | #include <linux/sysctl.h> | |
26 | #include <linux/proc_fs.h> | |
72c2d582 | 27 | #include <linux/security.h> |
1da177e4 LT |
28 | #include <linux/ctype.h> |
29 | #include <linux/utsname.h> | |
1da177e4 | 30 | #include <linux/smp_lock.h> |
62239ac2 | 31 | #include <linux/fs.h> |
1da177e4 LT |
32 | #include <linux/init.h> |
33 | #include <linux/kernel.h> | |
0296b228 | 34 | #include <linux/kobject.h> |
20380731 | 35 | #include <linux/net.h> |
1da177e4 LT |
36 | #include <linux/sysrq.h> |
37 | #include <linux/highuid.h> | |
38 | #include <linux/writeback.h> | |
39 | #include <linux/hugetlb.h> | |
1da177e4 | 40 | #include <linux/initrd.h> |
0b77f5bf | 41 | #include <linux/key.h> |
1da177e4 LT |
42 | #include <linux/times.h> |
43 | #include <linux/limits.h> | |
44 | #include <linux/dcache.h> | |
45 | #include <linux/syscalls.h> | |
c748e134 | 46 | #include <linux/vmstat.h> |
c255d844 PM |
47 | #include <linux/nfs_fs.h> |
48 | #include <linux/acpi.h> | |
10a0a8d4 | 49 | #include <linux/reboot.h> |
b0fc494f | 50 | #include <linux/ftrace.h> |
1da177e4 LT |
51 | |
52 | #include <asm/uaccess.h> | |
53 | #include <asm/processor.h> | |
54 | ||
29cbc78b AK |
55 | #ifdef CONFIG_X86 |
56 | #include <asm/nmi.h> | |
0741f4d2 | 57 | #include <asm/stacktrace.h> |
6e7c4025 | 58 | #include <asm/io.h> |
29cbc78b AK |
59 | #endif |
60 | ||
7058cb02 EB |
61 | static int deprecated_sysctl_warning(struct __sysctl_args *args); |
62 | ||
1da177e4 LT |
63 | #if defined(CONFIG_SYSCTL) |
64 | ||
65 | /* External variables not in a header file. */ | |
66 | extern int C_A_D; | |
45807a1d | 67 | extern int print_fatal_signals; |
1da177e4 LT |
68 | extern int sysctl_overcommit_memory; |
69 | extern int sysctl_overcommit_ratio; | |
fadd8fbd | 70 | extern int sysctl_panic_on_oom; |
fe071d7e | 71 | extern int sysctl_oom_kill_allocating_task; |
fef1bdd6 | 72 | extern int sysctl_oom_dump_tasks; |
1da177e4 | 73 | extern int max_threads; |
1da177e4 | 74 | extern int core_uses_pid; |
d6e71144 | 75 | extern int suid_dumpable; |
1da177e4 | 76 | extern char core_pattern[]; |
1da177e4 LT |
77 | extern int pid_max; |
78 | extern int min_free_kbytes; | |
1da177e4 | 79 | extern int pid_max_min, pid_max_max; |
9d0243bc | 80 | extern int sysctl_drop_caches; |
8ad4b1fb | 81 | extern int percpu_pagelist_fraction; |
bebfa101 | 82 | extern int compat_log; |
9745512c | 83 | extern int latencytop_enabled; |
eceea0b3 | 84 | extern int sysctl_nr_open_min, sysctl_nr_open_max; |
31a72bce PM |
85 | #ifdef CONFIG_RCU_TORTURE_TEST |
86 | extern int rcutorture_runnable; | |
87 | #endif /* #ifdef CONFIG_RCU_TORTURE_TEST */ | |
1da177e4 | 88 | |
c4f3b63f | 89 | /* Constants used for minimum and maximum */ |
1c4cd6dd | 90 | #if defined(CONFIG_HIGHMEM) || defined(CONFIG_DETECT_SOFTLOCKUP) |
c4f3b63f | 91 | static int one = 1; |
195cf453 BG |
92 | #endif |
93 | ||
94 | #ifdef CONFIG_DETECT_SOFTLOCKUP | |
c4f3b63f | 95 | static int sixty = 60; |
9383d967 | 96 | static int neg_one = -1; |
c4f3b63f RT |
97 | #endif |
98 | ||
bfcd17a6 | 99 | #if defined(CONFIG_MMU) && defined(CONFIG_FILE_LOCKING) |
c4f3b63f RT |
100 | static int two = 2; |
101 | #endif | |
102 | ||
103 | static int zero; | |
104 | static int one_hundred = 100; | |
105 | ||
1da177e4 LT |
106 | /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */ |
107 | static int maxolduid = 65535; | |
108 | static int minolduid; | |
8ad4b1fb | 109 | static int min_percpu_pagelist_fract = 8; |
1da177e4 LT |
110 | |
111 | static int ngroups_max = NGROUPS_MAX; | |
112 | ||
a1ef5adb | 113 | #ifdef CONFIG_MODULES |
1da177e4 LT |
114 | extern char modprobe_path[]; |
115 | #endif | |
1da177e4 LT |
116 | #ifdef CONFIG_CHR_DEV_SG |
117 | extern int sg_big_buff; | |
118 | #endif | |
1da177e4 | 119 | |
72c57ed5 | 120 | #ifdef CONFIG_SPARC |
17f04fbb | 121 | #include <asm/system.h> |
1da177e4 LT |
122 | #endif |
123 | ||
0871420f DM |
124 | #ifdef CONFIG_SPARC64 |
125 | extern int sysctl_tsb_ratio; | |
126 | #endif | |
127 | ||
1da177e4 LT |
128 | #ifdef __hppa__ |
129 | extern int pwrsw_enabled; | |
130 | extern int unaligned_enabled; | |
131 | #endif | |
132 | ||
347a8dc3 | 133 | #ifdef CONFIG_S390 |
1da177e4 LT |
134 | #ifdef CONFIG_MATHEMU |
135 | extern int sysctl_ieee_emulation_warnings; | |
136 | #endif | |
137 | extern int sysctl_userprocess_debug; | |
951f22d5 | 138 | extern int spin_retry; |
1da177e4 LT |
139 | #endif |
140 | ||
1da177e4 LT |
141 | #ifdef CONFIG_BSD_PROCESS_ACCT |
142 | extern int acct_parm[]; | |
143 | #endif | |
144 | ||
d2b176ed JS |
145 | #ifdef CONFIG_IA64 |
146 | extern int no_unaligned_warning; | |
147 | #endif | |
148 | ||
23f78d4a IM |
149 | #ifdef CONFIG_RT_MUTEXES |
150 | extern int max_lock_depth; | |
151 | #endif | |
152 | ||
d6f8ff73 | 153 | #ifdef CONFIG_PROC_SYSCTL |
d8217f07 | 154 | static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp, |
9ec52099 | 155 | void __user *buffer, size_t *lenp, loff_t *ppos); |
25ddbb18 | 156 | static int proc_taint(struct ctl_table *table, int write, struct file *filp, |
34f5a398 | 157 | void __user *buffer, size_t *lenp, loff_t *ppos); |
d6f8ff73 | 158 | #endif |
9ec52099 | 159 | |
d8217f07 | 160 | static struct ctl_table root_table[]; |
e51b6ba0 EB |
161 | static struct ctl_table_root sysctl_table_root; |
162 | static struct ctl_table_header root_table_header = { | |
b380b0d4 | 163 | .count = 1, |
e51b6ba0 | 164 | .ctl_table = root_table, |
73455092 | 165 | .ctl_entry = LIST_HEAD_INIT(sysctl_table_root.default_set.list), |
e51b6ba0 | 166 | .root = &sysctl_table_root, |
73455092 | 167 | .set = &sysctl_table_root.default_set, |
e51b6ba0 EB |
168 | }; |
169 | static struct ctl_table_root sysctl_table_root = { | |
170 | .root_list = LIST_HEAD_INIT(sysctl_table_root.root_list), | |
73455092 | 171 | .default_set.list = LIST_HEAD_INIT(root_table_header.ctl_entry), |
e51b6ba0 | 172 | }; |
1da177e4 | 173 | |
d8217f07 EB |
174 | static struct ctl_table kern_table[]; |
175 | static struct ctl_table vm_table[]; | |
176 | static struct ctl_table fs_table[]; | |
177 | static struct ctl_table debug_table[]; | |
178 | static struct ctl_table dev_table[]; | |
179 | extern struct ctl_table random_table[]; | |
2d9048e2 | 180 | #ifdef CONFIG_INOTIFY_USER |
d8217f07 | 181 | extern struct ctl_table inotify_table[]; |
0399cb08 | 182 | #endif |
7ef9964e DL |
183 | #ifdef CONFIG_EPOLL |
184 | extern struct ctl_table epoll_table[]; | |
185 | #endif | |
1da177e4 LT |
186 | |
187 | #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT | |
188 | int sysctl_legacy_va_layout; | |
189 | #endif | |
190 | ||
f20786ff PZ |
191 | extern int prove_locking; |
192 | extern int lock_stat; | |
9bc9a6bd | 193 | |
1da177e4 LT |
194 | /* The default sysctl tables: */ |
195 | ||
d8217f07 | 196 | static struct ctl_table root_table[] = { |
1da177e4 LT |
197 | { |
198 | .ctl_name = CTL_KERN, | |
199 | .procname = "kernel", | |
200 | .mode = 0555, | |
201 | .child = kern_table, | |
202 | }, | |
203 | { | |
204 | .ctl_name = CTL_VM, | |
205 | .procname = "vm", | |
206 | .mode = 0555, | |
207 | .child = vm_table, | |
208 | }, | |
1da177e4 LT |
209 | { |
210 | .ctl_name = CTL_FS, | |
211 | .procname = "fs", | |
212 | .mode = 0555, | |
213 | .child = fs_table, | |
214 | }, | |
215 | { | |
216 | .ctl_name = CTL_DEBUG, | |
217 | .procname = "debug", | |
218 | .mode = 0555, | |
219 | .child = debug_table, | |
220 | }, | |
221 | { | |
222 | .ctl_name = CTL_DEV, | |
223 | .procname = "dev", | |
224 | .mode = 0555, | |
225 | .child = dev_table, | |
226 | }, | |
2be7fe07 AM |
227 | /* |
228 | * NOTE: do not add new entries to this table unless you have read | |
229 | * Documentation/sysctl/ctl_unnumbered.txt | |
230 | */ | |
1da177e4 LT |
231 | { .ctl_name = 0 } |
232 | }; | |
233 | ||
77e54a1f | 234 | #ifdef CONFIG_SCHED_DEBUG |
73c4efd2 ED |
235 | static int min_sched_granularity_ns = 100000; /* 100 usecs */ |
236 | static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */ | |
237 | static int min_wakeup_granularity_ns; /* 0 usecs */ | |
238 | static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */ | |
77e54a1f IM |
239 | #endif |
240 | ||
d8217f07 | 241 | static struct ctl_table kern_table[] = { |
77e54a1f IM |
242 | #ifdef CONFIG_SCHED_DEBUG |
243 | { | |
244 | .ctl_name = CTL_UNNUMBERED, | |
b2be5e96 PZ |
245 | .procname = "sched_min_granularity_ns", |
246 | .data = &sysctl_sched_min_granularity, | |
77e54a1f IM |
247 | .maxlen = sizeof(unsigned int), |
248 | .mode = 0644, | |
b2be5e96 PZ |
249 | .proc_handler = &sched_nr_latency_handler, |
250 | .strategy = &sysctl_intvec, | |
251 | .extra1 = &min_sched_granularity_ns, | |
252 | .extra2 = &max_sched_granularity_ns, | |
77e54a1f | 253 | }, |
21805085 PZ |
254 | { |
255 | .ctl_name = CTL_UNNUMBERED, | |
256 | .procname = "sched_latency_ns", | |
257 | .data = &sysctl_sched_latency, | |
258 | .maxlen = sizeof(unsigned int), | |
259 | .mode = 0644, | |
b2be5e96 | 260 | .proc_handler = &sched_nr_latency_handler, |
21805085 PZ |
261 | .strategy = &sysctl_intvec, |
262 | .extra1 = &min_sched_granularity_ns, | |
263 | .extra2 = &max_sched_granularity_ns, | |
264 | }, | |
77e54a1f IM |
265 | { |
266 | .ctl_name = CTL_UNNUMBERED, | |
267 | .procname = "sched_wakeup_granularity_ns", | |
268 | .data = &sysctl_sched_wakeup_granularity, | |
269 | .maxlen = sizeof(unsigned int), | |
270 | .mode = 0644, | |
271 | .proc_handler = &proc_dointvec_minmax, | |
272 | .strategy = &sysctl_intvec, | |
77e54a1f IM |
273 | .extra1 = &min_wakeup_granularity_ns, |
274 | .extra2 = &max_wakeup_granularity_ns, | |
275 | }, | |
2398f2c6 PZ |
276 | { |
277 | .ctl_name = CTL_UNNUMBERED, | |
278 | .procname = "sched_shares_ratelimit", | |
279 | .data = &sysctl_sched_shares_ratelimit, | |
280 | .maxlen = sizeof(unsigned int), | |
281 | .mode = 0644, | |
282 | .proc_handler = &proc_dointvec, | |
283 | }, | |
ffda12a1 PZ |
284 | { |
285 | .ctl_name = CTL_UNNUMBERED, | |
286 | .procname = "sched_shares_thresh", | |
287 | .data = &sysctl_sched_shares_thresh, | |
288 | .maxlen = sizeof(unsigned int), | |
289 | .mode = 0644, | |
290 | .proc_handler = &proc_dointvec_minmax, | |
291 | .strategy = &sysctl_intvec, | |
292 | .extra1 = &zero, | |
293 | }, | |
77e54a1f IM |
294 | { |
295 | .ctl_name = CTL_UNNUMBERED, | |
296 | .procname = "sched_child_runs_first", | |
297 | .data = &sysctl_sched_child_runs_first, | |
298 | .maxlen = sizeof(unsigned int), | |
299 | .mode = 0644, | |
300 | .proc_handler = &proc_dointvec, | |
301 | }, | |
1fc84aaa PZ |
302 | { |
303 | .ctl_name = CTL_UNNUMBERED, | |
304 | .procname = "sched_features", | |
305 | .data = &sysctl_sched_features, | |
306 | .maxlen = sizeof(unsigned int), | |
307 | .mode = 0644, | |
308 | .proc_handler = &proc_dointvec, | |
309 | }, | |
da84d961 IM |
310 | { |
311 | .ctl_name = CTL_UNNUMBERED, | |
312 | .procname = "sched_migration_cost", | |
313 | .data = &sysctl_sched_migration_cost, | |
314 | .maxlen = sizeof(unsigned int), | |
315 | .mode = 0644, | |
316 | .proc_handler = &proc_dointvec, | |
317 | }, | |
b82d9fdd PZ |
318 | { |
319 | .ctl_name = CTL_UNNUMBERED, | |
320 | .procname = "sched_nr_migrate", | |
321 | .data = &sysctl_sched_nr_migrate, | |
322 | .maxlen = sizeof(unsigned int), | |
fa85ae24 PZ |
323 | .mode = 0644, |
324 | .proc_handler = &proc_dointvec, | |
325 | }, | |
1fc84aaa | 326 | #endif |
9f0c1e56 PZ |
327 | { |
328 | .ctl_name = CTL_UNNUMBERED, | |
329 | .procname = "sched_rt_period_us", | |
330 | .data = &sysctl_sched_rt_period, | |
331 | .maxlen = sizeof(unsigned int), | |
332 | .mode = 0644, | |
d0b27fa7 | 333 | .proc_handler = &sched_rt_handler, |
9f0c1e56 PZ |
334 | }, |
335 | { | |
336 | .ctl_name = CTL_UNNUMBERED, | |
337 | .procname = "sched_rt_runtime_us", | |
338 | .data = &sysctl_sched_rt_runtime, | |
339 | .maxlen = sizeof(int), | |
340 | .mode = 0644, | |
d0b27fa7 | 341 | .proc_handler = &sched_rt_handler, |
9f0c1e56 | 342 | }, |
1799e35d IM |
343 | { |
344 | .ctl_name = CTL_UNNUMBERED, | |
345 | .procname = "sched_compat_yield", | |
346 | .data = &sysctl_sched_compat_yield, | |
347 | .maxlen = sizeof(unsigned int), | |
348 | .mode = 0644, | |
349 | .proc_handler = &proc_dointvec, | |
350 | }, | |
f20786ff PZ |
351 | #ifdef CONFIG_PROVE_LOCKING |
352 | { | |
353 | .ctl_name = CTL_UNNUMBERED, | |
354 | .procname = "prove_locking", | |
355 | .data = &prove_locking, | |
356 | .maxlen = sizeof(int), | |
357 | .mode = 0644, | |
358 | .proc_handler = &proc_dointvec, | |
359 | }, | |
360 | #endif | |
361 | #ifdef CONFIG_LOCK_STAT | |
362 | { | |
363 | .ctl_name = CTL_UNNUMBERED, | |
364 | .procname = "lock_stat", | |
365 | .data = &lock_stat, | |
366 | .maxlen = sizeof(int), | |
367 | .mode = 0644, | |
368 | .proc_handler = &proc_dointvec, | |
369 | }, | |
77e54a1f | 370 | #endif |
1da177e4 LT |
371 | { |
372 | .ctl_name = KERN_PANIC, | |
373 | .procname = "panic", | |
374 | .data = &panic_timeout, | |
375 | .maxlen = sizeof(int), | |
376 | .mode = 0644, | |
377 | .proc_handler = &proc_dointvec, | |
378 | }, | |
379 | { | |
380 | .ctl_name = KERN_CORE_USES_PID, | |
381 | .procname = "core_uses_pid", | |
382 | .data = &core_uses_pid, | |
383 | .maxlen = sizeof(int), | |
384 | .mode = 0644, | |
385 | .proc_handler = &proc_dointvec, | |
386 | }, | |
387 | { | |
388 | .ctl_name = KERN_CORE_PATTERN, | |
389 | .procname = "core_pattern", | |
390 | .data = core_pattern, | |
71ce92f3 | 391 | .maxlen = CORENAME_MAX_SIZE, |
1da177e4 LT |
392 | .mode = 0644, |
393 | .proc_handler = &proc_dostring, | |
394 | .strategy = &sysctl_string, | |
395 | }, | |
34f5a398 | 396 | #ifdef CONFIG_PROC_SYSCTL |
1da177e4 | 397 | { |
1da177e4 | 398 | .procname = "tainted", |
25ddbb18 | 399 | .maxlen = sizeof(long), |
34f5a398 | 400 | .mode = 0644, |
25ddbb18 | 401 | .proc_handler = &proc_taint, |
1da177e4 | 402 | }, |
34f5a398 | 403 | #endif |
9745512c AV |
404 | #ifdef CONFIG_LATENCYTOP |
405 | { | |
406 | .procname = "latencytop", | |
407 | .data = &latencytop_enabled, | |
408 | .maxlen = sizeof(int), | |
409 | .mode = 0644, | |
410 | .proc_handler = &proc_dointvec, | |
411 | }, | |
412 | #endif | |
1da177e4 LT |
413 | #ifdef CONFIG_BLK_DEV_INITRD |
414 | { | |
415 | .ctl_name = KERN_REALROOTDEV, | |
416 | .procname = "real-root-dev", | |
417 | .data = &real_root_dev, | |
418 | .maxlen = sizeof(int), | |
419 | .mode = 0644, | |
420 | .proc_handler = &proc_dointvec, | |
421 | }, | |
422 | #endif | |
45807a1d IM |
423 | { |
424 | .ctl_name = CTL_UNNUMBERED, | |
425 | .procname = "print-fatal-signals", | |
426 | .data = &print_fatal_signals, | |
427 | .maxlen = sizeof(int), | |
428 | .mode = 0644, | |
429 | .proc_handler = &proc_dointvec, | |
430 | }, | |
72c57ed5 | 431 | #ifdef CONFIG_SPARC |
1da177e4 LT |
432 | { |
433 | .ctl_name = KERN_SPARC_REBOOT, | |
434 | .procname = "reboot-cmd", | |
435 | .data = reboot_command, | |
436 | .maxlen = 256, | |
437 | .mode = 0644, | |
438 | .proc_handler = &proc_dostring, | |
439 | .strategy = &sysctl_string, | |
440 | }, | |
441 | { | |
442 | .ctl_name = KERN_SPARC_STOP_A, | |
443 | .procname = "stop-a", | |
444 | .data = &stop_a_enabled, | |
445 | .maxlen = sizeof (int), | |
446 | .mode = 0644, | |
447 | .proc_handler = &proc_dointvec, | |
448 | }, | |
449 | { | |
450 | .ctl_name = KERN_SPARC_SCONS_PWROFF, | |
451 | .procname = "scons-poweroff", | |
452 | .data = &scons_pwroff, | |
453 | .maxlen = sizeof (int), | |
454 | .mode = 0644, | |
455 | .proc_handler = &proc_dointvec, | |
456 | }, | |
457 | #endif | |
0871420f DM |
458 | #ifdef CONFIG_SPARC64 |
459 | { | |
460 | .ctl_name = CTL_UNNUMBERED, | |
461 | .procname = "tsb-ratio", | |
462 | .data = &sysctl_tsb_ratio, | |
463 | .maxlen = sizeof (int), | |
464 | .mode = 0644, | |
465 | .proc_handler = &proc_dointvec, | |
466 | }, | |
467 | #endif | |
1da177e4 LT |
468 | #ifdef __hppa__ |
469 | { | |
470 | .ctl_name = KERN_HPPA_PWRSW, | |
471 | .procname = "soft-power", | |
472 | .data = &pwrsw_enabled, | |
473 | .maxlen = sizeof (int), | |
474 | .mode = 0644, | |
475 | .proc_handler = &proc_dointvec, | |
476 | }, | |
477 | { | |
478 | .ctl_name = KERN_HPPA_UNALIGNED, | |
479 | .procname = "unaligned-trap", | |
480 | .data = &unaligned_enabled, | |
481 | .maxlen = sizeof (int), | |
482 | .mode = 0644, | |
483 | .proc_handler = &proc_dointvec, | |
484 | }, | |
485 | #endif | |
486 | { | |
487 | .ctl_name = KERN_CTLALTDEL, | |
488 | .procname = "ctrl-alt-del", | |
489 | .data = &C_A_D, | |
490 | .maxlen = sizeof(int), | |
491 | .mode = 0644, | |
492 | .proc_handler = &proc_dointvec, | |
493 | }, | |
606576ce | 494 | #ifdef CONFIG_FUNCTION_TRACER |
b0fc494f SR |
495 | { |
496 | .ctl_name = CTL_UNNUMBERED, | |
497 | .procname = "ftrace_enabled", | |
498 | .data = &ftrace_enabled, | |
499 | .maxlen = sizeof(int), | |
500 | .mode = 0644, | |
501 | .proc_handler = &ftrace_enable_sysctl, | |
502 | }, | |
503 | #endif | |
f38f1d2a SR |
504 | #ifdef CONFIG_STACK_TRACER |
505 | { | |
506 | .ctl_name = CTL_UNNUMBERED, | |
507 | .procname = "stack_tracer_enabled", | |
508 | .data = &stack_tracer_enabled, | |
509 | .maxlen = sizeof(int), | |
510 | .mode = 0644, | |
511 | .proc_handler = &stack_trace_sysctl, | |
512 | }, | |
513 | #endif | |
944ac425 SR |
514 | #ifdef CONFIG_TRACING |
515 | { | |
516 | .ctl_name = CTL_UNNUMBERED, | |
3299b4dd | 517 | .procname = "ftrace_dump_on_oops", |
944ac425 SR |
518 | .data = &ftrace_dump_on_oops, |
519 | .maxlen = sizeof(int), | |
520 | .mode = 0644, | |
521 | .proc_handler = &proc_dointvec, | |
522 | }, | |
523 | #endif | |
a1ef5adb | 524 | #ifdef CONFIG_MODULES |
1da177e4 LT |
525 | { |
526 | .ctl_name = KERN_MODPROBE, | |
527 | .procname = "modprobe", | |
528 | .data = &modprobe_path, | |
529 | .maxlen = KMOD_PATH_LEN, | |
530 | .mode = 0644, | |
531 | .proc_handler = &proc_dostring, | |
532 | .strategy = &sysctl_string, | |
533 | }, | |
534 | #endif | |
57ae2508 | 535 | #if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET) |
1da177e4 LT |
536 | { |
537 | .ctl_name = KERN_HOTPLUG, | |
538 | .procname = "hotplug", | |
312c004d KS |
539 | .data = &uevent_helper, |
540 | .maxlen = UEVENT_HELPER_PATH_LEN, | |
1da177e4 LT |
541 | .mode = 0644, |
542 | .proc_handler = &proc_dostring, | |
543 | .strategy = &sysctl_string, | |
544 | }, | |
545 | #endif | |
546 | #ifdef CONFIG_CHR_DEV_SG | |
547 | { | |
548 | .ctl_name = KERN_SG_BIG_BUFF, | |
549 | .procname = "sg-big-buff", | |
550 | .data = &sg_big_buff, | |
551 | .maxlen = sizeof (int), | |
552 | .mode = 0444, | |
553 | .proc_handler = &proc_dointvec, | |
554 | }, | |
555 | #endif | |
556 | #ifdef CONFIG_BSD_PROCESS_ACCT | |
557 | { | |
558 | .ctl_name = KERN_ACCT, | |
559 | .procname = "acct", | |
560 | .data = &acct_parm, | |
561 | .maxlen = 3*sizeof(int), | |
562 | .mode = 0644, | |
563 | .proc_handler = &proc_dointvec, | |
564 | }, | |
565 | #endif | |
1da177e4 LT |
566 | #ifdef CONFIG_MAGIC_SYSRQ |
567 | { | |
568 | .ctl_name = KERN_SYSRQ, | |
569 | .procname = "sysrq", | |
5d6f647f | 570 | .data = &__sysrq_enabled, |
1da177e4 LT |
571 | .maxlen = sizeof (int), |
572 | .mode = 0644, | |
573 | .proc_handler = &proc_dointvec, | |
574 | }, | |
575 | #endif | |
d6f8ff73 | 576 | #ifdef CONFIG_PROC_SYSCTL |
1da177e4 | 577 | { |
1da177e4 | 578 | .procname = "cad_pid", |
9ec52099 | 579 | .data = NULL, |
1da177e4 LT |
580 | .maxlen = sizeof (int), |
581 | .mode = 0600, | |
9ec52099 | 582 | .proc_handler = &proc_do_cad_pid, |
1da177e4 | 583 | }, |
d6f8ff73 | 584 | #endif |
1da177e4 LT |
585 | { |
586 | .ctl_name = KERN_MAX_THREADS, | |
587 | .procname = "threads-max", | |
588 | .data = &max_threads, | |
589 | .maxlen = sizeof(int), | |
590 | .mode = 0644, | |
591 | .proc_handler = &proc_dointvec, | |
592 | }, | |
593 | { | |
594 | .ctl_name = KERN_RANDOM, | |
595 | .procname = "random", | |
596 | .mode = 0555, | |
597 | .child = random_table, | |
598 | }, | |
1da177e4 LT |
599 | { |
600 | .ctl_name = KERN_OVERFLOWUID, | |
601 | .procname = "overflowuid", | |
602 | .data = &overflowuid, | |
603 | .maxlen = sizeof(int), | |
604 | .mode = 0644, | |
605 | .proc_handler = &proc_dointvec_minmax, | |
606 | .strategy = &sysctl_intvec, | |
607 | .extra1 = &minolduid, | |
608 | .extra2 = &maxolduid, | |
609 | }, | |
610 | { | |
611 | .ctl_name = KERN_OVERFLOWGID, | |
612 | .procname = "overflowgid", | |
613 | .data = &overflowgid, | |
614 | .maxlen = sizeof(int), | |
615 | .mode = 0644, | |
616 | .proc_handler = &proc_dointvec_minmax, | |
617 | .strategy = &sysctl_intvec, | |
618 | .extra1 = &minolduid, | |
619 | .extra2 = &maxolduid, | |
620 | }, | |
347a8dc3 | 621 | #ifdef CONFIG_S390 |
1da177e4 LT |
622 | #ifdef CONFIG_MATHEMU |
623 | { | |
624 | .ctl_name = KERN_IEEE_EMULATION_WARNINGS, | |
625 | .procname = "ieee_emulation_warnings", | |
626 | .data = &sysctl_ieee_emulation_warnings, | |
627 | .maxlen = sizeof(int), | |
628 | .mode = 0644, | |
629 | .proc_handler = &proc_dointvec, | |
630 | }, | |
1da177e4 LT |
631 | #endif |
632 | { | |
633 | .ctl_name = KERN_S390_USER_DEBUG_LOGGING, | |
634 | .procname = "userprocess_debug", | |
635 | .data = &sysctl_userprocess_debug, | |
636 | .maxlen = sizeof(int), | |
637 | .mode = 0644, | |
638 | .proc_handler = &proc_dointvec, | |
639 | }, | |
640 | #endif | |
641 | { | |
642 | .ctl_name = KERN_PIDMAX, | |
643 | .procname = "pid_max", | |
644 | .data = &pid_max, | |
645 | .maxlen = sizeof (int), | |
646 | .mode = 0644, | |
647 | .proc_handler = &proc_dointvec_minmax, | |
648 | .strategy = sysctl_intvec, | |
649 | .extra1 = &pid_max_min, | |
650 | .extra2 = &pid_max_max, | |
651 | }, | |
652 | { | |
653 | .ctl_name = KERN_PANIC_ON_OOPS, | |
654 | .procname = "panic_on_oops", | |
655 | .data = &panic_on_oops, | |
656 | .maxlen = sizeof(int), | |
657 | .mode = 0644, | |
658 | .proc_handler = &proc_dointvec, | |
659 | }, | |
7ef3d2fd JP |
660 | #if defined CONFIG_PRINTK |
661 | { | |
662 | .ctl_name = KERN_PRINTK, | |
663 | .procname = "printk", | |
664 | .data = &console_loglevel, | |
665 | .maxlen = 4*sizeof(int), | |
666 | .mode = 0644, | |
667 | .proc_handler = &proc_dointvec, | |
668 | }, | |
1da177e4 LT |
669 | { |
670 | .ctl_name = KERN_PRINTK_RATELIMIT, | |
671 | .procname = "printk_ratelimit", | |
717115e1 | 672 | .data = &printk_ratelimit_state.interval, |
1da177e4 LT |
673 | .maxlen = sizeof(int), |
674 | .mode = 0644, | |
675 | .proc_handler = &proc_dointvec_jiffies, | |
676 | .strategy = &sysctl_jiffies, | |
677 | }, | |
678 | { | |
679 | .ctl_name = KERN_PRINTK_RATELIMIT_BURST, | |
680 | .procname = "printk_ratelimit_burst", | |
717115e1 | 681 | .data = &printk_ratelimit_state.burst, |
1da177e4 LT |
682 | .maxlen = sizeof(int), |
683 | .mode = 0644, | |
684 | .proc_handler = &proc_dointvec, | |
685 | }, | |
7ef3d2fd | 686 | #endif |
1da177e4 LT |
687 | { |
688 | .ctl_name = KERN_NGROUPS_MAX, | |
689 | .procname = "ngroups_max", | |
690 | .data = &ngroups_max, | |
691 | .maxlen = sizeof (int), | |
692 | .mode = 0444, | |
693 | .proc_handler = &proc_dointvec, | |
694 | }, | |
695 | #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86) | |
696 | { | |
697 | .ctl_name = KERN_UNKNOWN_NMI_PANIC, | |
698 | .procname = "unknown_nmi_panic", | |
699 | .data = &unknown_nmi_panic, | |
700 | .maxlen = sizeof (int), | |
701 | .mode = 0644, | |
2fbe7b25 | 702 | .proc_handler = &proc_dointvec, |
1da177e4 | 703 | }, |
407984f1 | 704 | { |
407984f1 DZ |
705 | .procname = "nmi_watchdog", |
706 | .data = &nmi_watchdog_enabled, | |
707 | .maxlen = sizeof (int), | |
708 | .mode = 0644, | |
709 | .proc_handler = &proc_nmi_enabled, | |
1da177e4 LT |
710 | }, |
711 | #endif | |
712 | #if defined(CONFIG_X86) | |
8da5adda DZ |
713 | { |
714 | .ctl_name = KERN_PANIC_ON_NMI, | |
715 | .procname = "panic_on_unrecovered_nmi", | |
716 | .data = &panic_on_unrecovered_nmi, | |
717 | .maxlen = sizeof(int), | |
718 | .mode = 0644, | |
719 | .proc_handler = &proc_dointvec, | |
720 | }, | |
1da177e4 LT |
721 | { |
722 | .ctl_name = KERN_BOOTLOADER_TYPE, | |
723 | .procname = "bootloader_type", | |
724 | .data = &bootloader_type, | |
725 | .maxlen = sizeof (int), | |
726 | .mode = 0444, | |
727 | .proc_handler = &proc_dointvec, | |
728 | }, | |
0741f4d2 CE |
729 | { |
730 | .ctl_name = CTL_UNNUMBERED, | |
731 | .procname = "kstack_depth_to_print", | |
732 | .data = &kstack_depth_to_print, | |
733 | .maxlen = sizeof(int), | |
734 | .mode = 0644, | |
735 | .proc_handler = &proc_dointvec, | |
736 | }, | |
6e7c4025 IM |
737 | { |
738 | .ctl_name = CTL_UNNUMBERED, | |
739 | .procname = "io_delay_type", | |
740 | .data = &io_delay_type, | |
741 | .maxlen = sizeof(int), | |
742 | .mode = 0644, | |
743 | .proc_handler = &proc_dointvec, | |
744 | }, | |
1da177e4 | 745 | #endif |
7a9166e3 | 746 | #if defined(CONFIG_MMU) |
1da177e4 LT |
747 | { |
748 | .ctl_name = KERN_RANDOMIZE, | |
749 | .procname = "randomize_va_space", | |
750 | .data = &randomize_va_space, | |
751 | .maxlen = sizeof(int), | |
752 | .mode = 0644, | |
753 | .proc_handler = &proc_dointvec, | |
754 | }, | |
7a9166e3 | 755 | #endif |
0152fb37 | 756 | #if defined(CONFIG_S390) && defined(CONFIG_SMP) |
951f22d5 MS |
757 | { |
758 | .ctl_name = KERN_SPIN_RETRY, | |
759 | .procname = "spin_retry", | |
760 | .data = &spin_retry, | |
761 | .maxlen = sizeof (int), | |
762 | .mode = 0644, | |
763 | .proc_handler = &proc_dointvec, | |
764 | }, | |
c255d844 | 765 | #endif |
673d5b43 | 766 | #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86) |
c255d844 | 767 | { |
c255d844 | 768 | .procname = "acpi_video_flags", |
77afcf78 | 769 | .data = &acpi_realmode_flags, |
c255d844 PM |
770 | .maxlen = sizeof (unsigned long), |
771 | .mode = 0644, | |
7f99f06f | 772 | .proc_handler = &proc_doulongvec_minmax, |
c255d844 | 773 | }, |
d2b176ed JS |
774 | #endif |
775 | #ifdef CONFIG_IA64 | |
776 | { | |
777 | .ctl_name = KERN_IA64_UNALIGNED, | |
778 | .procname = "ignore-unaligned-usertrap", | |
779 | .data = &no_unaligned_warning, | |
780 | .maxlen = sizeof (int), | |
781 | .mode = 0644, | |
782 | .proc_handler = &proc_dointvec, | |
783 | }, | |
bebfa101 | 784 | #endif |
c4f3b63f | 785 | #ifdef CONFIG_DETECT_SOFTLOCKUP |
9c44bc03 IM |
786 | { |
787 | .ctl_name = CTL_UNNUMBERED, | |
788 | .procname = "softlockup_panic", | |
789 | .data = &softlockup_panic, | |
790 | .maxlen = sizeof(int), | |
791 | .mode = 0644, | |
4dca10a9 | 792 | .proc_handler = &proc_dointvec_minmax, |
9c44bc03 IM |
793 | .strategy = &sysctl_intvec, |
794 | .extra1 = &zero, | |
795 | .extra2 = &one, | |
796 | }, | |
c4f3b63f RT |
797 | { |
798 | .ctl_name = CTL_UNNUMBERED, | |
799 | .procname = "softlockup_thresh", | |
800 | .data = &softlockup_thresh, | |
9383d967 | 801 | .maxlen = sizeof(int), |
c4f3b63f | 802 | .mode = 0644, |
9383d967 | 803 | .proc_handler = &proc_dointvec_minmax, |
c4f3b63f | 804 | .strategy = &sysctl_intvec, |
9383d967 | 805 | .extra1 = &neg_one, |
c4f3b63f RT |
806 | .extra2 = &sixty, |
807 | }, | |
82a1fcb9 IM |
808 | { |
809 | .ctl_name = CTL_UNNUMBERED, | |
810 | .procname = "hung_task_check_count", | |
811 | .data = &sysctl_hung_task_check_count, | |
90739081 | 812 | .maxlen = sizeof(unsigned long), |
82a1fcb9 | 813 | .mode = 0644, |
90739081 | 814 | .proc_handler = &proc_doulongvec_minmax, |
82a1fcb9 IM |
815 | .strategy = &sysctl_intvec, |
816 | }, | |
817 | { | |
818 | .ctl_name = CTL_UNNUMBERED, | |
819 | .procname = "hung_task_timeout_secs", | |
820 | .data = &sysctl_hung_task_timeout_secs, | |
90739081 | 821 | .maxlen = sizeof(unsigned long), |
82a1fcb9 | 822 | .mode = 0644, |
90739081 | 823 | .proc_handler = &proc_doulongvec_minmax, |
82a1fcb9 IM |
824 | .strategy = &sysctl_intvec, |
825 | }, | |
826 | { | |
827 | .ctl_name = CTL_UNNUMBERED, | |
828 | .procname = "hung_task_warnings", | |
829 | .data = &sysctl_hung_task_warnings, | |
90739081 | 830 | .maxlen = sizeof(unsigned long), |
82a1fcb9 | 831 | .mode = 0644, |
90739081 | 832 | .proc_handler = &proc_doulongvec_minmax, |
82a1fcb9 IM |
833 | .strategy = &sysctl_intvec, |
834 | }, | |
c4f3b63f | 835 | #endif |
bebfa101 AK |
836 | #ifdef CONFIG_COMPAT |
837 | { | |
838 | .ctl_name = KERN_COMPAT_LOG, | |
839 | .procname = "compat-log", | |
840 | .data = &compat_log, | |
841 | .maxlen = sizeof (int), | |
842 | .mode = 0644, | |
843 | .proc_handler = &proc_dointvec, | |
844 | }, | |
951f22d5 | 845 | #endif |
23f78d4a IM |
846 | #ifdef CONFIG_RT_MUTEXES |
847 | { | |
848 | .ctl_name = KERN_MAX_LOCK_DEPTH, | |
849 | .procname = "max_lock_depth", | |
850 | .data = &max_lock_depth, | |
851 | .maxlen = sizeof(int), | |
852 | .mode = 0644, | |
853 | .proc_handler = &proc_dointvec, | |
854 | }, | |
5096add8 | 855 | #endif |
10a0a8d4 JF |
856 | { |
857 | .ctl_name = CTL_UNNUMBERED, | |
858 | .procname = "poweroff_cmd", | |
859 | .data = &poweroff_cmd, | |
860 | .maxlen = POWEROFF_CMD_PATH_LEN, | |
861 | .mode = 0644, | |
862 | .proc_handler = &proc_dostring, | |
863 | .strategy = &sysctl_string, | |
864 | }, | |
0b77f5bf DH |
865 | #ifdef CONFIG_KEYS |
866 | { | |
867 | .ctl_name = CTL_UNNUMBERED, | |
868 | .procname = "keys", | |
869 | .mode = 0555, | |
870 | .child = key_sysctls, | |
871 | }, | |
872 | #endif | |
31a72bce PM |
873 | #ifdef CONFIG_RCU_TORTURE_TEST |
874 | { | |
875 | .ctl_name = CTL_UNNUMBERED, | |
876 | .procname = "rcutorture_runnable", | |
877 | .data = &rcutorture_runnable, | |
878 | .maxlen = sizeof(int), | |
879 | .mode = 0644, | |
880 | .proc_handler = &proc_dointvec, | |
881 | }, | |
882 | #endif | |
af936a16 LS |
883 | #ifdef CONFIG_UNEVICTABLE_LRU |
884 | { | |
885 | .ctl_name = CTL_UNNUMBERED, | |
886 | .procname = "scan_unevictable_pages", | |
887 | .data = &scan_unevictable_pages, | |
888 | .maxlen = sizeof(scan_unevictable_pages), | |
889 | .mode = 0644, | |
890 | .proc_handler = &scan_unevictable_handler, | |
891 | }, | |
892 | #endif | |
ed2c12f3 AM |
893 | /* |
894 | * NOTE: do not add new entries to this table unless you have read | |
895 | * Documentation/sysctl/ctl_unnumbered.txt | |
896 | */ | |
1da177e4 LT |
897 | { .ctl_name = 0 } |
898 | }; | |
899 | ||
d8217f07 | 900 | static struct ctl_table vm_table[] = { |
1da177e4 LT |
901 | { |
902 | .ctl_name = VM_OVERCOMMIT_MEMORY, | |
903 | .procname = "overcommit_memory", | |
904 | .data = &sysctl_overcommit_memory, | |
905 | .maxlen = sizeof(sysctl_overcommit_memory), | |
906 | .mode = 0644, | |
907 | .proc_handler = &proc_dointvec, | |
908 | }, | |
fadd8fbd KH |
909 | { |
910 | .ctl_name = VM_PANIC_ON_OOM, | |
911 | .procname = "panic_on_oom", | |
912 | .data = &sysctl_panic_on_oom, | |
913 | .maxlen = sizeof(sysctl_panic_on_oom), | |
914 | .mode = 0644, | |
915 | .proc_handler = &proc_dointvec, | |
916 | }, | |
fe071d7e DR |
917 | { |
918 | .ctl_name = CTL_UNNUMBERED, | |
919 | .procname = "oom_kill_allocating_task", | |
920 | .data = &sysctl_oom_kill_allocating_task, | |
921 | .maxlen = sizeof(sysctl_oom_kill_allocating_task), | |
922 | .mode = 0644, | |
923 | .proc_handler = &proc_dointvec, | |
924 | }, | |
fef1bdd6 DR |
925 | { |
926 | .ctl_name = CTL_UNNUMBERED, | |
927 | .procname = "oom_dump_tasks", | |
928 | .data = &sysctl_oom_dump_tasks, | |
929 | .maxlen = sizeof(sysctl_oom_dump_tasks), | |
930 | .mode = 0644, | |
931 | .proc_handler = &proc_dointvec, | |
932 | }, | |
1da177e4 LT |
933 | { |
934 | .ctl_name = VM_OVERCOMMIT_RATIO, | |
935 | .procname = "overcommit_ratio", | |
936 | .data = &sysctl_overcommit_ratio, | |
937 | .maxlen = sizeof(sysctl_overcommit_ratio), | |
938 | .mode = 0644, | |
939 | .proc_handler = &proc_dointvec, | |
940 | }, | |
941 | { | |
942 | .ctl_name = VM_PAGE_CLUSTER, | |
943 | .procname = "page-cluster", | |
944 | .data = &page_cluster, | |
945 | .maxlen = sizeof(int), | |
946 | .mode = 0644, | |
947 | .proc_handler = &proc_dointvec, | |
948 | }, | |
949 | { | |
950 | .ctl_name = VM_DIRTY_BACKGROUND, | |
951 | .procname = "dirty_background_ratio", | |
952 | .data = &dirty_background_ratio, | |
953 | .maxlen = sizeof(dirty_background_ratio), | |
954 | .mode = 0644, | |
955 | .proc_handler = &proc_dointvec_minmax, | |
956 | .strategy = &sysctl_intvec, | |
957 | .extra1 = &zero, | |
958 | .extra2 = &one_hundred, | |
959 | }, | |
960 | { | |
961 | .ctl_name = VM_DIRTY_RATIO, | |
962 | .procname = "dirty_ratio", | |
963 | .data = &vm_dirty_ratio, | |
964 | .maxlen = sizeof(vm_dirty_ratio), | |
965 | .mode = 0644, | |
04fbfdc1 | 966 | .proc_handler = &dirty_ratio_handler, |
1da177e4 LT |
967 | .strategy = &sysctl_intvec, |
968 | .extra1 = &zero, | |
969 | .extra2 = &one_hundred, | |
970 | }, | |
971 | { | |
1da177e4 | 972 | .procname = "dirty_writeback_centisecs", |
f6ef9438 BS |
973 | .data = &dirty_writeback_interval, |
974 | .maxlen = sizeof(dirty_writeback_interval), | |
1da177e4 LT |
975 | .mode = 0644, |
976 | .proc_handler = &dirty_writeback_centisecs_handler, | |
977 | }, | |
978 | { | |
1da177e4 | 979 | .procname = "dirty_expire_centisecs", |
f6ef9438 BS |
980 | .data = &dirty_expire_interval, |
981 | .maxlen = sizeof(dirty_expire_interval), | |
1da177e4 | 982 | .mode = 0644, |
f6ef9438 | 983 | .proc_handler = &proc_dointvec_userhz_jiffies, |
1da177e4 LT |
984 | }, |
985 | { | |
986 | .ctl_name = VM_NR_PDFLUSH_THREADS, | |
987 | .procname = "nr_pdflush_threads", | |
988 | .data = &nr_pdflush_threads, | |
989 | .maxlen = sizeof nr_pdflush_threads, | |
990 | .mode = 0444 /* read-only*/, | |
991 | .proc_handler = &proc_dointvec, | |
992 | }, | |
993 | { | |
994 | .ctl_name = VM_SWAPPINESS, | |
995 | .procname = "swappiness", | |
996 | .data = &vm_swappiness, | |
997 | .maxlen = sizeof(vm_swappiness), | |
998 | .mode = 0644, | |
999 | .proc_handler = &proc_dointvec_minmax, | |
1000 | .strategy = &sysctl_intvec, | |
1001 | .extra1 = &zero, | |
1002 | .extra2 = &one_hundred, | |
1003 | }, | |
1004 | #ifdef CONFIG_HUGETLB_PAGE | |
1005 | { | |
1da177e4 | 1006 | .procname = "nr_hugepages", |
e5ff2159 | 1007 | .data = NULL, |
1da177e4 LT |
1008 | .maxlen = sizeof(unsigned long), |
1009 | .mode = 0644, | |
1010 | .proc_handler = &hugetlb_sysctl_handler, | |
1011 | .extra1 = (void *)&hugetlb_zero, | |
1012 | .extra2 = (void *)&hugetlb_infinity, | |
1013 | }, | |
1014 | { | |
1015 | .ctl_name = VM_HUGETLB_GROUP, | |
1016 | .procname = "hugetlb_shm_group", | |
1017 | .data = &sysctl_hugetlb_shm_group, | |
1018 | .maxlen = sizeof(gid_t), | |
1019 | .mode = 0644, | |
1020 | .proc_handler = &proc_dointvec, | |
1021 | }, | |
396faf03 MG |
1022 | { |
1023 | .ctl_name = CTL_UNNUMBERED, | |
1024 | .procname = "hugepages_treat_as_movable", | |
1025 | .data = &hugepages_treat_as_movable, | |
1026 | .maxlen = sizeof(int), | |
1027 | .mode = 0644, | |
1028 | .proc_handler = &hugetlb_treat_movable_handler, | |
1029 | }, | |
d1c3fb1f NA |
1030 | { |
1031 | .ctl_name = CTL_UNNUMBERED, | |
1032 | .procname = "nr_overcommit_hugepages", | |
e5ff2159 AK |
1033 | .data = NULL, |
1034 | .maxlen = sizeof(unsigned long), | |
d1c3fb1f | 1035 | .mode = 0644, |
a3d0c6aa | 1036 | .proc_handler = &hugetlb_overcommit_handler, |
e5ff2159 AK |
1037 | .extra1 = (void *)&hugetlb_zero, |
1038 | .extra2 = (void *)&hugetlb_infinity, | |
d1c3fb1f | 1039 | }, |
1da177e4 LT |
1040 | #endif |
1041 | { | |
1042 | .ctl_name = VM_LOWMEM_RESERVE_RATIO, | |
1043 | .procname = "lowmem_reserve_ratio", | |
1044 | .data = &sysctl_lowmem_reserve_ratio, | |
1045 | .maxlen = sizeof(sysctl_lowmem_reserve_ratio), | |
1046 | .mode = 0644, | |
1047 | .proc_handler = &lowmem_reserve_ratio_sysctl_handler, | |
1048 | .strategy = &sysctl_intvec, | |
1049 | }, | |
9d0243bc AM |
1050 | { |
1051 | .ctl_name = VM_DROP_PAGECACHE, | |
1052 | .procname = "drop_caches", | |
1053 | .data = &sysctl_drop_caches, | |
1054 | .maxlen = sizeof(int), | |
1055 | .mode = 0644, | |
1056 | .proc_handler = drop_caches_sysctl_handler, | |
1057 | .strategy = &sysctl_intvec, | |
1058 | }, | |
1da177e4 LT |
1059 | { |
1060 | .ctl_name = VM_MIN_FREE_KBYTES, | |
1061 | .procname = "min_free_kbytes", | |
1062 | .data = &min_free_kbytes, | |
1063 | .maxlen = sizeof(min_free_kbytes), | |
1064 | .mode = 0644, | |
1065 | .proc_handler = &min_free_kbytes_sysctl_handler, | |
1066 | .strategy = &sysctl_intvec, | |
1067 | .extra1 = &zero, | |
1068 | }, | |
8ad4b1fb RS |
1069 | { |
1070 | .ctl_name = VM_PERCPU_PAGELIST_FRACTION, | |
1071 | .procname = "percpu_pagelist_fraction", | |
1072 | .data = &percpu_pagelist_fraction, | |
1073 | .maxlen = sizeof(percpu_pagelist_fraction), | |
1074 | .mode = 0644, | |
1075 | .proc_handler = &percpu_pagelist_fraction_sysctl_handler, | |
1076 | .strategy = &sysctl_intvec, | |
1077 | .extra1 = &min_percpu_pagelist_fract, | |
1078 | }, | |
1da177e4 LT |
1079 | #ifdef CONFIG_MMU |
1080 | { | |
1081 | .ctl_name = VM_MAX_MAP_COUNT, | |
1082 | .procname = "max_map_count", | |
1083 | .data = &sysctl_max_map_count, | |
1084 | .maxlen = sizeof(sysctl_max_map_count), | |
1085 | .mode = 0644, | |
1086 | .proc_handler = &proc_dointvec | |
1087 | }, | |
1088 | #endif | |
1089 | { | |
1090 | .ctl_name = VM_LAPTOP_MODE, | |
1091 | .procname = "laptop_mode", | |
1092 | .data = &laptop_mode, | |
1093 | .maxlen = sizeof(laptop_mode), | |
1094 | .mode = 0644, | |
ed5b43f1 BS |
1095 | .proc_handler = &proc_dointvec_jiffies, |
1096 | .strategy = &sysctl_jiffies, | |
1da177e4 LT |
1097 | }, |
1098 | { | |
1099 | .ctl_name = VM_BLOCK_DUMP, | |
1100 | .procname = "block_dump", | |
1101 | .data = &block_dump, | |
1102 | .maxlen = sizeof(block_dump), | |
1103 | .mode = 0644, | |
1104 | .proc_handler = &proc_dointvec, | |
1105 | .strategy = &sysctl_intvec, | |
1106 | .extra1 = &zero, | |
1107 | }, | |
1108 | { | |
1109 | .ctl_name = VM_VFS_CACHE_PRESSURE, | |
1110 | .procname = "vfs_cache_pressure", | |
1111 | .data = &sysctl_vfs_cache_pressure, | |
1112 | .maxlen = sizeof(sysctl_vfs_cache_pressure), | |
1113 | .mode = 0644, | |
1114 | .proc_handler = &proc_dointvec, | |
1115 | .strategy = &sysctl_intvec, | |
1116 | .extra1 = &zero, | |
1117 | }, | |
1118 | #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT | |
1119 | { | |
1120 | .ctl_name = VM_LEGACY_VA_LAYOUT, | |
1121 | .procname = "legacy_va_layout", | |
1122 | .data = &sysctl_legacy_va_layout, | |
1123 | .maxlen = sizeof(sysctl_legacy_va_layout), | |
1124 | .mode = 0644, | |
1125 | .proc_handler = &proc_dointvec, | |
1126 | .strategy = &sysctl_intvec, | |
1127 | .extra1 = &zero, | |
1128 | }, | |
1129 | #endif | |
1743660b CL |
1130 | #ifdef CONFIG_NUMA |
1131 | { | |
1132 | .ctl_name = VM_ZONE_RECLAIM_MODE, | |
1133 | .procname = "zone_reclaim_mode", | |
1134 | .data = &zone_reclaim_mode, | |
1135 | .maxlen = sizeof(zone_reclaim_mode), | |
1136 | .mode = 0644, | |
1137 | .proc_handler = &proc_dointvec, | |
c84db23c CL |
1138 | .strategy = &sysctl_intvec, |
1139 | .extra1 = &zero, | |
1743660b | 1140 | }, |
9614634f CL |
1141 | { |
1142 | .ctl_name = VM_MIN_UNMAPPED, | |
1143 | .procname = "min_unmapped_ratio", | |
1144 | .data = &sysctl_min_unmapped_ratio, | |
1145 | .maxlen = sizeof(sysctl_min_unmapped_ratio), | |
1146 | .mode = 0644, | |
1147 | .proc_handler = &sysctl_min_unmapped_ratio_sysctl_handler, | |
1148 | .strategy = &sysctl_intvec, | |
1149 | .extra1 = &zero, | |
1150 | .extra2 = &one_hundred, | |
1151 | }, | |
0ff38490 CL |
1152 | { |
1153 | .ctl_name = VM_MIN_SLAB, | |
1154 | .procname = "min_slab_ratio", | |
1155 | .data = &sysctl_min_slab_ratio, | |
1156 | .maxlen = sizeof(sysctl_min_slab_ratio), | |
1157 | .mode = 0644, | |
1158 | .proc_handler = &sysctl_min_slab_ratio_sysctl_handler, | |
1159 | .strategy = &sysctl_intvec, | |
1160 | .extra1 = &zero, | |
1161 | .extra2 = &one_hundred, | |
1162 | }, | |
e6e5494c | 1163 | #endif |
77461ab3 CL |
1164 | #ifdef CONFIG_SMP |
1165 | { | |
1166 | .ctl_name = CTL_UNNUMBERED, | |
1167 | .procname = "stat_interval", | |
1168 | .data = &sysctl_stat_interval, | |
1169 | .maxlen = sizeof(sysctl_stat_interval), | |
1170 | .mode = 0644, | |
1171 | .proc_handler = &proc_dointvec_jiffies, | |
1172 | .strategy = &sysctl_jiffies, | |
1173 | }, | |
1174 | #endif | |
ed032189 EP |
1175 | #ifdef CONFIG_SECURITY |
1176 | { | |
1177 | .ctl_name = CTL_UNNUMBERED, | |
1178 | .procname = "mmap_min_addr", | |
1179 | .data = &mmap_min_addr, | |
1180 | .maxlen = sizeof(unsigned long), | |
1181 | .mode = 0644, | |
1182 | .proc_handler = &proc_doulongvec_minmax, | |
1183 | }, | |
8daec965 | 1184 | #endif |
f0c0b2b8 KH |
1185 | #ifdef CONFIG_NUMA |
1186 | { | |
1187 | .ctl_name = CTL_UNNUMBERED, | |
1188 | .procname = "numa_zonelist_order", | |
1189 | .data = &numa_zonelist_order, | |
1190 | .maxlen = NUMA_ZONELIST_ORDER_LEN, | |
1191 | .mode = 0644, | |
1192 | .proc_handler = &numa_zonelist_order_handler, | |
1193 | .strategy = &sysctl_string, | |
1194 | }, | |
1195 | #endif | |
2b8232ce | 1196 | #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \ |
5c36e657 | 1197 | (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL)) |
e6e5494c IM |
1198 | { |
1199 | .ctl_name = VM_VDSO_ENABLED, | |
1200 | .procname = "vdso_enabled", | |
1201 | .data = &vdso_enabled, | |
1202 | .maxlen = sizeof(vdso_enabled), | |
1203 | .mode = 0644, | |
1204 | .proc_handler = &proc_dointvec, | |
1205 | .strategy = &sysctl_intvec, | |
1206 | .extra1 = &zero, | |
1207 | }, | |
1da177e4 | 1208 | #endif |
195cf453 BG |
1209 | #ifdef CONFIG_HIGHMEM |
1210 | { | |
1211 | .ctl_name = CTL_UNNUMBERED, | |
1212 | .procname = "highmem_is_dirtyable", | |
1213 | .data = &vm_highmem_is_dirtyable, | |
1214 | .maxlen = sizeof(vm_highmem_is_dirtyable), | |
1215 | .mode = 0644, | |
1216 | .proc_handler = &proc_dointvec_minmax, | |
1217 | .strategy = &sysctl_intvec, | |
1218 | .extra1 = &zero, | |
1219 | .extra2 = &one, | |
1220 | }, | |
1221 | #endif | |
2be7fe07 AM |
1222 | /* |
1223 | * NOTE: do not add new entries to this table unless you have read | |
1224 | * Documentation/sysctl/ctl_unnumbered.txt | |
1225 | */ | |
1da177e4 LT |
1226 | { .ctl_name = 0 } |
1227 | }; | |
1228 | ||
2abc26fc | 1229 | #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) |
d8217f07 | 1230 | static struct ctl_table binfmt_misc_table[] = { |
2abc26fc EB |
1231 | { .ctl_name = 0 } |
1232 | }; | |
1233 | #endif | |
1234 | ||
d8217f07 | 1235 | static struct ctl_table fs_table[] = { |
1da177e4 LT |
1236 | { |
1237 | .ctl_name = FS_NRINODE, | |
1238 | .procname = "inode-nr", | |
1239 | .data = &inodes_stat, | |
1240 | .maxlen = 2*sizeof(int), | |
1241 | .mode = 0444, | |
1242 | .proc_handler = &proc_dointvec, | |
1243 | }, | |
1244 | { | |
1245 | .ctl_name = FS_STATINODE, | |
1246 | .procname = "inode-state", | |
1247 | .data = &inodes_stat, | |
1248 | .maxlen = 7*sizeof(int), | |
1249 | .mode = 0444, | |
1250 | .proc_handler = &proc_dointvec, | |
1251 | }, | |
1252 | { | |
1da177e4 LT |
1253 | .procname = "file-nr", |
1254 | .data = &files_stat, | |
1255 | .maxlen = 3*sizeof(int), | |
1256 | .mode = 0444, | |
529bf6be | 1257 | .proc_handler = &proc_nr_files, |
1da177e4 LT |
1258 | }, |
1259 | { | |
1260 | .ctl_name = FS_MAXFILE, | |
1261 | .procname = "file-max", | |
1262 | .data = &files_stat.max_files, | |
1263 | .maxlen = sizeof(int), | |
1264 | .mode = 0644, | |
1265 | .proc_handler = &proc_dointvec, | |
1266 | }, | |
9cfe015a ED |
1267 | { |
1268 | .ctl_name = CTL_UNNUMBERED, | |
1269 | .procname = "nr_open", | |
1270 | .data = &sysctl_nr_open, | |
1271 | .maxlen = sizeof(int), | |
1272 | .mode = 0644, | |
eceea0b3 AV |
1273 | .proc_handler = &proc_dointvec_minmax, |
1274 | .extra1 = &sysctl_nr_open_min, | |
1275 | .extra2 = &sysctl_nr_open_max, | |
9cfe015a | 1276 | }, |
1da177e4 LT |
1277 | { |
1278 | .ctl_name = FS_DENTRY, | |
1279 | .procname = "dentry-state", | |
1280 | .data = &dentry_stat, | |
1281 | .maxlen = 6*sizeof(int), | |
1282 | .mode = 0444, | |
1283 | .proc_handler = &proc_dointvec, | |
1284 | }, | |
1285 | { | |
1286 | .ctl_name = FS_OVERFLOWUID, | |
1287 | .procname = "overflowuid", | |
1288 | .data = &fs_overflowuid, | |
1289 | .maxlen = sizeof(int), | |
1290 | .mode = 0644, | |
1291 | .proc_handler = &proc_dointvec_minmax, | |
1292 | .strategy = &sysctl_intvec, | |
1293 | .extra1 = &minolduid, | |
1294 | .extra2 = &maxolduid, | |
1295 | }, | |
1296 | { | |
1297 | .ctl_name = FS_OVERFLOWGID, | |
1298 | .procname = "overflowgid", | |
1299 | .data = &fs_overflowgid, | |
1300 | .maxlen = sizeof(int), | |
1301 | .mode = 0644, | |
1302 | .proc_handler = &proc_dointvec_minmax, | |
1303 | .strategy = &sysctl_intvec, | |
1304 | .extra1 = &minolduid, | |
1305 | .extra2 = &maxolduid, | |
1306 | }, | |
bfcd17a6 | 1307 | #ifdef CONFIG_FILE_LOCKING |
1da177e4 LT |
1308 | { |
1309 | .ctl_name = FS_LEASES, | |
1310 | .procname = "leases-enable", | |
1311 | .data = &leases_enable, | |
1312 | .maxlen = sizeof(int), | |
1313 | .mode = 0644, | |
1314 | .proc_handler = &proc_dointvec, | |
1315 | }, | |
bfcd17a6 | 1316 | #endif |
1da177e4 LT |
1317 | #ifdef CONFIG_DNOTIFY |
1318 | { | |
1319 | .ctl_name = FS_DIR_NOTIFY, | |
1320 | .procname = "dir-notify-enable", | |
1321 | .data = &dir_notify_enable, | |
1322 | .maxlen = sizeof(int), | |
1323 | .mode = 0644, | |
1324 | .proc_handler = &proc_dointvec, | |
1325 | }, | |
1326 | #endif | |
1327 | #ifdef CONFIG_MMU | |
bfcd17a6 | 1328 | #ifdef CONFIG_FILE_LOCKING |
1da177e4 LT |
1329 | { |
1330 | .ctl_name = FS_LEASE_TIME, | |
1331 | .procname = "lease-break-time", | |
1332 | .data = &lease_break_time, | |
1333 | .maxlen = sizeof(int), | |
1334 | .mode = 0644, | |
76fdbb25 KH |
1335 | .proc_handler = &proc_dointvec_minmax, |
1336 | .strategy = &sysctl_intvec, | |
1337 | .extra1 = &zero, | |
1338 | .extra2 = &two, | |
1da177e4 | 1339 | }, |
bfcd17a6 | 1340 | #endif |
ebf3f09c | 1341 | #ifdef CONFIG_AIO |
1da177e4 | 1342 | { |
1da177e4 LT |
1343 | .procname = "aio-nr", |
1344 | .data = &aio_nr, | |
1345 | .maxlen = sizeof(aio_nr), | |
1346 | .mode = 0444, | |
d55b5fda | 1347 | .proc_handler = &proc_doulongvec_minmax, |
1da177e4 LT |
1348 | }, |
1349 | { | |
1da177e4 LT |
1350 | .procname = "aio-max-nr", |
1351 | .data = &aio_max_nr, | |
1352 | .maxlen = sizeof(aio_max_nr), | |
1353 | .mode = 0644, | |
d55b5fda | 1354 | .proc_handler = &proc_doulongvec_minmax, |
1da177e4 | 1355 | }, |
ebf3f09c | 1356 | #endif /* CONFIG_AIO */ |
2d9048e2 | 1357 | #ifdef CONFIG_INOTIFY_USER |
0399cb08 RL |
1358 | { |
1359 | .ctl_name = FS_INOTIFY, | |
1360 | .procname = "inotify", | |
1361 | .mode = 0555, | |
1362 | .child = inotify_table, | |
1363 | }, | |
1364 | #endif | |
7ef9964e DL |
1365 | #ifdef CONFIG_EPOLL |
1366 | { | |
1367 | .procname = "epoll", | |
1368 | .mode = 0555, | |
1369 | .child = epoll_table, | |
1370 | }, | |
1371 | #endif | |
1da177e4 | 1372 | #endif |
d6e71144 AC |
1373 | { |
1374 | .ctl_name = KERN_SETUID_DUMPABLE, | |
1375 | .procname = "suid_dumpable", | |
1376 | .data = &suid_dumpable, | |
1377 | .maxlen = sizeof(int), | |
1378 | .mode = 0644, | |
1379 | .proc_handler = &proc_dointvec, | |
1380 | }, | |
2abc26fc EB |
1381 | #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) |
1382 | { | |
1383 | .ctl_name = CTL_UNNUMBERED, | |
1384 | .procname = "binfmt_misc", | |
1385 | .mode = 0555, | |
1386 | .child = binfmt_misc_table, | |
1387 | }, | |
1388 | #endif | |
2be7fe07 AM |
1389 | /* |
1390 | * NOTE: do not add new entries to this table unless you have read | |
1391 | * Documentation/sysctl/ctl_unnumbered.txt | |
2be7fe07 | 1392 | */ |
1da177e4 LT |
1393 | { .ctl_name = 0 } |
1394 | }; | |
1395 | ||
d8217f07 | 1396 | static struct ctl_table debug_table[] = { |
d0c3d534 | 1397 | #if defined(CONFIG_X86) || defined(CONFIG_PPC) |
abd4f750 MAS |
1398 | { |
1399 | .ctl_name = CTL_UNNUMBERED, | |
1400 | .procname = "exception-trace", | |
1401 | .data = &show_unhandled_signals, | |
1402 | .maxlen = sizeof(int), | |
1403 | .mode = 0644, | |
1404 | .proc_handler = proc_dointvec | |
1405 | }, | |
1406 | #endif | |
1da177e4 LT |
1407 | { .ctl_name = 0 } |
1408 | }; | |
1409 | ||
d8217f07 | 1410 | static struct ctl_table dev_table[] = { |
1da177e4 | 1411 | { .ctl_name = 0 } |
0eeca283 | 1412 | }; |
1da177e4 | 1413 | |
330d57fb AV |
1414 | static DEFINE_SPINLOCK(sysctl_lock); |
1415 | ||
1416 | /* called under sysctl_lock */ | |
1417 | static int use_table(struct ctl_table_header *p) | |
1418 | { | |
1419 | if (unlikely(p->unregistering)) | |
1420 | return 0; | |
1421 | p->used++; | |
1422 | return 1; | |
1423 | } | |
1424 | ||
1425 | /* called under sysctl_lock */ | |
1426 | static void unuse_table(struct ctl_table_header *p) | |
1427 | { | |
1428 | if (!--p->used) | |
1429 | if (unlikely(p->unregistering)) | |
1430 | complete(p->unregistering); | |
1431 | } | |
1432 | ||
1433 | /* called under sysctl_lock, will reacquire if has to wait */ | |
1434 | static void start_unregistering(struct ctl_table_header *p) | |
1435 | { | |
1436 | /* | |
1437 | * if p->used is 0, nobody will ever touch that entry again; | |
1438 | * we'll eliminate all paths to it before dropping sysctl_lock | |
1439 | */ | |
1440 | if (unlikely(p->used)) { | |
1441 | struct completion wait; | |
1442 | init_completion(&wait); | |
1443 | p->unregistering = &wait; | |
1444 | spin_unlock(&sysctl_lock); | |
1445 | wait_for_completion(&wait); | |
1446 | spin_lock(&sysctl_lock); | |
f7e6ced4 AV |
1447 | } else { |
1448 | /* anything non-NULL; we'll never dereference it */ | |
1449 | p->unregistering = ERR_PTR(-EINVAL); | |
330d57fb AV |
1450 | } |
1451 | /* | |
1452 | * do not remove from the list until nobody holds it; walking the | |
1453 | * list in do_sysctl() relies on that. | |
1454 | */ | |
1455 | list_del_init(&p->ctl_entry); | |
1456 | } | |
1457 | ||
f7e6ced4 AV |
1458 | void sysctl_head_get(struct ctl_table_header *head) |
1459 | { | |
1460 | spin_lock(&sysctl_lock); | |
1461 | head->count++; | |
1462 | spin_unlock(&sysctl_lock); | |
1463 | } | |
1464 | ||
1465 | void sysctl_head_put(struct ctl_table_header *head) | |
1466 | { | |
1467 | spin_lock(&sysctl_lock); | |
1468 | if (!--head->count) | |
1469 | kfree(head); | |
1470 | spin_unlock(&sysctl_lock); | |
1471 | } | |
1472 | ||
1473 | struct ctl_table_header *sysctl_head_grab(struct ctl_table_header *head) | |
1474 | { | |
1475 | if (!head) | |
1476 | BUG(); | |
1477 | spin_lock(&sysctl_lock); | |
1478 | if (!use_table(head)) | |
1479 | head = ERR_PTR(-ENOENT); | |
1480 | spin_unlock(&sysctl_lock); | |
1481 | return head; | |
1482 | } | |
1483 | ||
805b5d5e EB |
1484 | void sysctl_head_finish(struct ctl_table_header *head) |
1485 | { | |
1486 | if (!head) | |
1487 | return; | |
1488 | spin_lock(&sysctl_lock); | |
1489 | unuse_table(head); | |
1490 | spin_unlock(&sysctl_lock); | |
1491 | } | |
1492 | ||
73455092 AV |
1493 | static struct ctl_table_set * |
1494 | lookup_header_set(struct ctl_table_root *root, struct nsproxy *namespaces) | |
1495 | { | |
1496 | struct ctl_table_set *set = &root->default_set; | |
1497 | if (root->lookup) | |
1498 | set = root->lookup(root, namespaces); | |
1499 | return set; | |
1500 | } | |
1501 | ||
e51b6ba0 EB |
1502 | static struct list_head * |
1503 | lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces) | |
805b5d5e | 1504 | { |
73455092 AV |
1505 | struct ctl_table_set *set = lookup_header_set(root, namespaces); |
1506 | return &set->list; | |
e51b6ba0 EB |
1507 | } |
1508 | ||
1509 | struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces, | |
1510 | struct ctl_table_header *prev) | |
1511 | { | |
1512 | struct ctl_table_root *root; | |
1513 | struct list_head *header_list; | |
805b5d5e EB |
1514 | struct ctl_table_header *head; |
1515 | struct list_head *tmp; | |
e51b6ba0 | 1516 | |
805b5d5e EB |
1517 | spin_lock(&sysctl_lock); |
1518 | if (prev) { | |
e51b6ba0 | 1519 | head = prev; |
805b5d5e EB |
1520 | tmp = &prev->ctl_entry; |
1521 | unuse_table(prev); | |
1522 | goto next; | |
1523 | } | |
1524 | tmp = &root_table_header.ctl_entry; | |
1525 | for (;;) { | |
1526 | head = list_entry(tmp, struct ctl_table_header, ctl_entry); | |
1527 | ||
1528 | if (!use_table(head)) | |
1529 | goto next; | |
1530 | spin_unlock(&sysctl_lock); | |
1531 | return head; | |
1532 | next: | |
e51b6ba0 | 1533 | root = head->root; |
805b5d5e | 1534 | tmp = tmp->next; |
e51b6ba0 EB |
1535 | header_list = lookup_header_list(root, namespaces); |
1536 | if (tmp != header_list) | |
1537 | continue; | |
1538 | ||
1539 | do { | |
1540 | root = list_entry(root->root_list.next, | |
1541 | struct ctl_table_root, root_list); | |
1542 | if (root == &sysctl_table_root) | |
1543 | goto out; | |
1544 | header_list = lookup_header_list(root, namespaces); | |
1545 | } while (list_empty(header_list)); | |
1546 | tmp = header_list->next; | |
805b5d5e | 1547 | } |
e51b6ba0 | 1548 | out: |
805b5d5e EB |
1549 | spin_unlock(&sysctl_lock); |
1550 | return NULL; | |
1551 | } | |
1552 | ||
e51b6ba0 EB |
1553 | struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev) |
1554 | { | |
1555 | return __sysctl_head_next(current->nsproxy, prev); | |
1556 | } | |
1557 | ||
1558 | void register_sysctl_root(struct ctl_table_root *root) | |
1559 | { | |
1560 | spin_lock(&sysctl_lock); | |
1561 | list_add_tail(&root->root_list, &sysctl_table_root.root_list); | |
1562 | spin_unlock(&sysctl_lock); | |
1563 | } | |
1564 | ||
b89a8171 | 1565 | #ifdef CONFIG_SYSCTL_SYSCALL |
2c4c7155 | 1566 | /* Perform the actual read/write of a sysctl table entry. */ |
d7321cd6 PE |
1567 | static int do_sysctl_strategy(struct ctl_table_root *root, |
1568 | struct ctl_table *table, | |
2c4c7155 PE |
1569 | void __user *oldval, size_t __user *oldlenp, |
1570 | void __user *newval, size_t newlen) | |
1571 | { | |
1572 | int op = 0, rc; | |
1573 | ||
1574 | if (oldval) | |
e6305c43 | 1575 | op |= MAY_READ; |
2c4c7155 | 1576 | if (newval) |
e6305c43 | 1577 | op |= MAY_WRITE; |
d7321cd6 | 1578 | if (sysctl_perm(root, table, op)) |
2c4c7155 PE |
1579 | return -EPERM; |
1580 | ||
1581 | if (table->strategy) { | |
f221e726 | 1582 | rc = table->strategy(table, oldval, oldlenp, newval, newlen); |
2c4c7155 PE |
1583 | if (rc < 0) |
1584 | return rc; | |
1585 | if (rc > 0) | |
1586 | return 0; | |
1587 | } | |
1588 | ||
1589 | /* If there is no strategy routine, or if the strategy returns | |
1590 | * zero, proceed with automatic r/w */ | |
1591 | if (table->data && table->maxlen) { | |
f221e726 | 1592 | rc = sysctl_data(table, oldval, oldlenp, newval, newlen); |
2c4c7155 PE |
1593 | if (rc < 0) |
1594 | return rc; | |
1595 | } | |
1596 | return 0; | |
1597 | } | |
1598 | ||
1599 | static int parse_table(int __user *name, int nlen, | |
1600 | void __user *oldval, size_t __user *oldlenp, | |
1601 | void __user *newval, size_t newlen, | |
d7321cd6 | 1602 | struct ctl_table_root *root, |
2c4c7155 PE |
1603 | struct ctl_table *table) |
1604 | { | |
1605 | int n; | |
1606 | repeat: | |
1607 | if (!nlen) | |
1608 | return -ENOTDIR; | |
1609 | if (get_user(n, name)) | |
1610 | return -EFAULT; | |
1611 | for ( ; table->ctl_name || table->procname; table++) { | |
1612 | if (!table->ctl_name) | |
1613 | continue; | |
1614 | if (n == table->ctl_name) { | |
1615 | int error; | |
1616 | if (table->child) { | |
e6305c43 | 1617 | if (sysctl_perm(root, table, MAY_EXEC)) |
2c4c7155 PE |
1618 | return -EPERM; |
1619 | name++; | |
1620 | nlen--; | |
1621 | table = table->child; | |
1622 | goto repeat; | |
1623 | } | |
f221e726 | 1624 | error = do_sysctl_strategy(root, table, |
2c4c7155 PE |
1625 | oldval, oldlenp, |
1626 | newval, newlen); | |
1627 | return error; | |
1628 | } | |
1629 | } | |
1630 | return -ENOTDIR; | |
1631 | } | |
1632 | ||
1da177e4 LT |
1633 | int do_sysctl(int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp, |
1634 | void __user *newval, size_t newlen) | |
1635 | { | |
805b5d5e | 1636 | struct ctl_table_header *head; |
330d57fb | 1637 | int error = -ENOTDIR; |
1da177e4 LT |
1638 | |
1639 | if (nlen <= 0 || nlen >= CTL_MAXNAME) | |
1640 | return -ENOTDIR; | |
1641 | if (oldval) { | |
1642 | int old_len; | |
1643 | if (!oldlenp || get_user(old_len, oldlenp)) | |
1644 | return -EFAULT; | |
1645 | } | |
330d57fb | 1646 | |
805b5d5e EB |
1647 | for (head = sysctl_head_next(NULL); head; |
1648 | head = sysctl_head_next(head)) { | |
330d57fb | 1649 | error = parse_table(name, nlen, oldval, oldlenp, |
d7321cd6 PE |
1650 | newval, newlen, |
1651 | head->root, head->ctl_table); | |
805b5d5e EB |
1652 | if (error != -ENOTDIR) { |
1653 | sysctl_head_finish(head); | |
330d57fb | 1654 | break; |
805b5d5e EB |
1655 | } |
1656 | } | |
330d57fb | 1657 | return error; |
1da177e4 LT |
1658 | } |
1659 | ||
1660 | asmlinkage long sys_sysctl(struct __sysctl_args __user *args) | |
1661 | { | |
1662 | struct __sysctl_args tmp; | |
1663 | int error; | |
1664 | ||
1665 | if (copy_from_user(&tmp, args, sizeof(tmp))) | |
1666 | return -EFAULT; | |
1667 | ||
7058cb02 EB |
1668 | error = deprecated_sysctl_warning(&tmp); |
1669 | if (error) | |
1670 | goto out; | |
1671 | ||
1da177e4 LT |
1672 | lock_kernel(); |
1673 | error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp, | |
1674 | tmp.newval, tmp.newlen); | |
1675 | unlock_kernel(); | |
7058cb02 | 1676 | out: |
1da177e4 LT |
1677 | return error; |
1678 | } | |
b89a8171 | 1679 | #endif /* CONFIG_SYSCTL_SYSCALL */ |
1da177e4 LT |
1680 | |
1681 | /* | |
1ff007eb | 1682 | * sysctl_perm does NOT grant the superuser all rights automatically, because |
1da177e4 LT |
1683 | * some sysctl variables are readonly even to root. |
1684 | */ | |
1685 | ||
1686 | static int test_perm(int mode, int op) | |
1687 | { | |
76aac0e9 | 1688 | if (!current_euid()) |
1da177e4 LT |
1689 | mode >>= 6; |
1690 | else if (in_egroup_p(0)) | |
1691 | mode >>= 3; | |
e6305c43 | 1692 | if ((op & ~mode & (MAY_READ|MAY_WRITE|MAY_EXEC)) == 0) |
1da177e4 LT |
1693 | return 0; |
1694 | return -EACCES; | |
1695 | } | |
1696 | ||
d7321cd6 | 1697 | int sysctl_perm(struct ctl_table_root *root, struct ctl_table *table, int op) |
1da177e4 LT |
1698 | { |
1699 | int error; | |
d7321cd6 PE |
1700 | int mode; |
1701 | ||
e6305c43 | 1702 | error = security_sysctl(table, op & (MAY_READ | MAY_WRITE | MAY_EXEC)); |
1da177e4 LT |
1703 | if (error) |
1704 | return error; | |
d7321cd6 PE |
1705 | |
1706 | if (root->permissions) | |
1707 | mode = root->permissions(root, current->nsproxy, table); | |
1708 | else | |
1709 | mode = table->mode; | |
1710 | ||
1711 | return test_perm(mode, op); | |
1da177e4 LT |
1712 | } |
1713 | ||
d912b0cc EB |
1714 | static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table) |
1715 | { | |
1716 | for (; table->ctl_name || table->procname; table++) { | |
1717 | table->parent = parent; | |
1718 | if (table->child) | |
1719 | sysctl_set_parent(table, table->child); | |
1720 | } | |
1721 | } | |
1722 | ||
1723 | static __init int sysctl_init(void) | |
1724 | { | |
1725 | sysctl_set_parent(NULL, root_table); | |
88f458e4 HS |
1726 | #ifdef CONFIG_SYSCTL_SYSCALL_CHECK |
1727 | { | |
1728 | int err; | |
1729 | err = sysctl_check_table(current->nsproxy, root_table); | |
1730 | } | |
1731 | #endif | |
d912b0cc EB |
1732 | return 0; |
1733 | } | |
1734 | ||
1735 | core_initcall(sysctl_init); | |
1736 | ||
bfbcf034 AV |
1737 | static struct ctl_table *is_branch_in(struct ctl_table *branch, |
1738 | struct ctl_table *table) | |
ae7edecc AV |
1739 | { |
1740 | struct ctl_table *p; | |
1741 | const char *s = branch->procname; | |
1742 | ||
1743 | /* branch should have named subdirectory as its first element */ | |
1744 | if (!s || !branch->child) | |
bfbcf034 | 1745 | return NULL; |
ae7edecc AV |
1746 | |
1747 | /* ... and nothing else */ | |
1748 | if (branch[1].procname || branch[1].ctl_name) | |
bfbcf034 | 1749 | return NULL; |
ae7edecc AV |
1750 | |
1751 | /* table should contain subdirectory with the same name */ | |
1752 | for (p = table; p->procname || p->ctl_name; p++) { | |
1753 | if (!p->child) | |
1754 | continue; | |
1755 | if (p->procname && strcmp(p->procname, s) == 0) | |
bfbcf034 | 1756 | return p; |
ae7edecc | 1757 | } |
bfbcf034 | 1758 | return NULL; |
ae7edecc AV |
1759 | } |
1760 | ||
1761 | /* see if attaching q to p would be an improvement */ | |
1762 | static void try_attach(struct ctl_table_header *p, struct ctl_table_header *q) | |
1763 | { | |
1764 | struct ctl_table *to = p->ctl_table, *by = q->ctl_table; | |
bfbcf034 | 1765 | struct ctl_table *next; |
ae7edecc AV |
1766 | int is_better = 0; |
1767 | int not_in_parent = !p->attached_by; | |
1768 | ||
bfbcf034 | 1769 | while ((next = is_branch_in(by, to)) != NULL) { |
ae7edecc AV |
1770 | if (by == q->attached_by) |
1771 | is_better = 1; | |
1772 | if (to == p->attached_by) | |
1773 | not_in_parent = 1; | |
1774 | by = by->child; | |
bfbcf034 | 1775 | to = next->child; |
ae7edecc AV |
1776 | } |
1777 | ||
1778 | if (is_better && not_in_parent) { | |
1779 | q->attached_by = by; | |
1780 | q->attached_to = to; | |
1781 | q->parent = p; | |
1782 | } | |
1783 | } | |
1784 | ||
1da177e4 | 1785 | /** |
e51b6ba0 EB |
1786 | * __register_sysctl_paths - register a sysctl hierarchy |
1787 | * @root: List of sysctl headers to register on | |
1788 | * @namespaces: Data to compute which lists of sysctl entries are visible | |
29e796fd | 1789 | * @path: The path to the directory the sysctl table is in. |
1da177e4 | 1790 | * @table: the top-level table structure |
1da177e4 LT |
1791 | * |
1792 | * Register a sysctl table hierarchy. @table should be a filled in ctl_table | |
29e796fd | 1793 | * array. A completely 0 filled entry terminates the table. |
1da177e4 | 1794 | * |
d8217f07 | 1795 | * The members of the &struct ctl_table structure are used as follows: |
1da177e4 LT |
1796 | * |
1797 | * ctl_name - This is the numeric sysctl value used by sysctl(2). The number | |
1798 | * must be unique within that level of sysctl | |
1799 | * | |
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 | * | |
1814 | * strategy - the strategy routine (described below) | |
1815 | * | |
1816 | * de - for internal use by the sysctl routines | |
1817 | * | |
1818 | * extra1, extra2 - extra pointers usable by the proc handler routines | |
1819 | * | |
1820 | * Leaf nodes in the sysctl tree will be represented by a single file | |
1821 | * under /proc; non-leaf nodes will be represented by directories. | |
1822 | * | |
1823 | * sysctl(2) can automatically manage read and write requests through | |
1824 | * the sysctl table. The data and maxlen fields of the ctl_table | |
1825 | * struct enable minimal validation of the values being written to be | |
1826 | * performed, and the mode field allows minimal authentication. | |
1827 | * | |
1828 | * More sophisticated management can be enabled by the provision of a | |
1829 | * strategy routine with the table entry. This will be called before | |
1830 | * any automatic read or write of the data is performed. | |
1831 | * | |
1832 | * The strategy routine may return | |
1833 | * | |
1834 | * < 0 - Error occurred (error is passed to user process) | |
1835 | * | |
1836 | * 0 - OK - proceed with automatic read or write. | |
1837 | * | |
1838 | * > 0 - OK - read or write has been done by the strategy routine, so | |
1839 | * return immediately. | |
1840 | * | |
1841 | * There must be a proc_handler routine for any terminal nodes | |
1842 | * mirrored under /proc/sys (non-terminals are handled by a built-in | |
1843 | * directory handler). Several default handlers are available to | |
1844 | * cover common cases - | |
1845 | * | |
1846 | * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(), | |
1847 | * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(), | |
1848 | * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax() | |
1849 | * | |
1850 | * It is the handler's job to read the input buffer from user memory | |
1851 | * and process it. The handler should return 0 on success. | |
1852 | * | |
1853 | * This routine returns %NULL on a failure to register, and a pointer | |
1854 | * to the table header on success. | |
1855 | */ | |
e51b6ba0 EB |
1856 | struct ctl_table_header *__register_sysctl_paths( |
1857 | struct ctl_table_root *root, | |
1858 | struct nsproxy *namespaces, | |
1859 | const struct ctl_path *path, struct ctl_table *table) | |
1da177e4 | 1860 | { |
29e796fd EB |
1861 | struct ctl_table_header *header; |
1862 | struct ctl_table *new, **prevp; | |
1863 | unsigned int n, npath; | |
ae7edecc | 1864 | struct ctl_table_set *set; |
29e796fd EB |
1865 | |
1866 | /* Count the path components */ | |
1867 | for (npath = 0; path[npath].ctl_name || path[npath].procname; ++npath) | |
1868 | ; | |
1869 | ||
1870 | /* | |
1871 | * For each path component, allocate a 2-element ctl_table array. | |
1872 | * The first array element will be filled with the sysctl entry | |
1873 | * for this, the second will be the sentinel (ctl_name == 0). | |
1874 | * | |
1875 | * We allocate everything in one go so that we don't have to | |
1876 | * worry about freeing additional memory in unregister_sysctl_table. | |
1877 | */ | |
1878 | header = kzalloc(sizeof(struct ctl_table_header) + | |
1879 | (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL); | |
1880 | if (!header) | |
1da177e4 | 1881 | return NULL; |
29e796fd EB |
1882 | |
1883 | new = (struct ctl_table *) (header + 1); | |
1884 | ||
1885 | /* Now connect the dots */ | |
1886 | prevp = &header->ctl_table; | |
1887 | for (n = 0; n < npath; ++n, ++path) { | |
1888 | /* Copy the procname */ | |
1889 | new->procname = path->procname; | |
1890 | new->ctl_name = path->ctl_name; | |
1891 | new->mode = 0555; | |
1892 | ||
1893 | *prevp = new; | |
1894 | prevp = &new->child; | |
1895 | ||
1896 | new += 2; | |
1897 | } | |
1898 | *prevp = table; | |
23eb06de | 1899 | header->ctl_table_arg = table; |
29e796fd EB |
1900 | |
1901 | INIT_LIST_HEAD(&header->ctl_entry); | |
1902 | header->used = 0; | |
1903 | header->unregistering = NULL; | |
e51b6ba0 | 1904 | header->root = root; |
29e796fd | 1905 | sysctl_set_parent(NULL, header->ctl_table); |
f7e6ced4 | 1906 | header->count = 1; |
88f458e4 | 1907 | #ifdef CONFIG_SYSCTL_SYSCALL_CHECK |
e51b6ba0 | 1908 | if (sysctl_check_table(namespaces, header->ctl_table)) { |
29e796fd | 1909 | kfree(header); |
fc6cd25b EB |
1910 | return NULL; |
1911 | } | |
88f458e4 | 1912 | #endif |
330d57fb | 1913 | spin_lock(&sysctl_lock); |
73455092 | 1914 | header->set = lookup_header_set(root, namespaces); |
ae7edecc AV |
1915 | header->attached_by = header->ctl_table; |
1916 | header->attached_to = root_table; | |
1917 | header->parent = &root_table_header; | |
1918 | for (set = header->set; set; set = set->parent) { | |
1919 | struct ctl_table_header *p; | |
1920 | list_for_each_entry(p, &set->list, ctl_entry) { | |
1921 | if (p->unregistering) | |
1922 | continue; | |
1923 | try_attach(p, header); | |
1924 | } | |
1925 | } | |
1926 | header->parent->count++; | |
73455092 | 1927 | list_add_tail(&header->ctl_entry, &header->set->list); |
330d57fb | 1928 | spin_unlock(&sysctl_lock); |
29e796fd EB |
1929 | |
1930 | return header; | |
1931 | } | |
1932 | ||
e51b6ba0 EB |
1933 | /** |
1934 | * register_sysctl_table_path - register a sysctl table hierarchy | |
1935 | * @path: The path to the directory the sysctl table is in. | |
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_paths(const struct ctl_path *path, | |
1944 | struct ctl_table *table) | |
1945 | { | |
1946 | return __register_sysctl_paths(&sysctl_table_root, current->nsproxy, | |
1947 | path, table); | |
1948 | } | |
1949 | ||
29e796fd EB |
1950 | /** |
1951 | * register_sysctl_table - register a sysctl table hierarchy | |
1952 | * @table: the top-level table structure | |
1953 | * | |
1954 | * Register a sysctl table hierarchy. @table should be a filled in ctl_table | |
1955 | * array. A completely 0 filled entry terminates the table. | |
1956 | * | |
1957 | * See register_sysctl_paths for more details. | |
1958 | */ | |
1959 | struct ctl_table_header *register_sysctl_table(struct ctl_table *table) | |
1960 | { | |
1961 | static const struct ctl_path null_path[] = { {} }; | |
1962 | ||
1963 | return register_sysctl_paths(null_path, table); | |
1da177e4 LT |
1964 | } |
1965 | ||
1966 | /** | |
1967 | * unregister_sysctl_table - unregister a sysctl table hierarchy | |
1968 | * @header: the header returned from register_sysctl_table | |
1969 | * | |
1970 | * Unregisters the sysctl table and all children. proc entries may not | |
1971 | * actually be removed until they are no longer used by anyone. | |
1972 | */ | |
1973 | void unregister_sysctl_table(struct ctl_table_header * header) | |
1974 | { | |
330d57fb | 1975 | might_sleep(); |
f1dad166 PE |
1976 | |
1977 | if (header == NULL) | |
1978 | return; | |
1979 | ||
330d57fb AV |
1980 | spin_lock(&sysctl_lock); |
1981 | start_unregistering(header); | |
ae7edecc AV |
1982 | if (!--header->parent->count) { |
1983 | WARN_ON(1); | |
1984 | kfree(header->parent); | |
1985 | } | |
f7e6ced4 AV |
1986 | if (!--header->count) |
1987 | kfree(header); | |
330d57fb | 1988 | spin_unlock(&sysctl_lock); |
1da177e4 LT |
1989 | } |
1990 | ||
9043476f AV |
1991 | int sysctl_is_seen(struct ctl_table_header *p) |
1992 | { | |
1993 | struct ctl_table_set *set = p->set; | |
1994 | int res; | |
1995 | spin_lock(&sysctl_lock); | |
1996 | if (p->unregistering) | |
1997 | res = 0; | |
1998 | else if (!set->is_seen) | |
1999 | res = 1; | |
2000 | else | |
2001 | res = set->is_seen(set); | |
2002 | spin_unlock(&sysctl_lock); | |
2003 | return res; | |
2004 | } | |
2005 | ||
73455092 AV |
2006 | void setup_sysctl_set(struct ctl_table_set *p, |
2007 | struct ctl_table_set *parent, | |
2008 | int (*is_seen)(struct ctl_table_set *)) | |
2009 | { | |
2010 | INIT_LIST_HEAD(&p->list); | |
2011 | p->parent = parent ? parent : &sysctl_table_root.default_set; | |
2012 | p->is_seen = is_seen; | |
2013 | } | |
2014 | ||
b89a8171 | 2015 | #else /* !CONFIG_SYSCTL */ |
d8217f07 | 2016 | struct ctl_table_header *register_sysctl_table(struct ctl_table * table) |
b89a8171 EB |
2017 | { |
2018 | return NULL; | |
2019 | } | |
2020 | ||
29e796fd EB |
2021 | struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path, |
2022 | struct ctl_table *table) | |
2023 | { | |
2024 | return NULL; | |
2025 | } | |
2026 | ||
b89a8171 EB |
2027 | void unregister_sysctl_table(struct ctl_table_header * table) |
2028 | { | |
2029 | } | |
2030 | ||
73455092 AV |
2031 | void setup_sysctl_set(struct ctl_table_set *p, |
2032 | struct ctl_table_set *parent, | |
2033 | int (*is_seen)(struct ctl_table_set *)) | |
2034 | { | |
2035 | } | |
2036 | ||
f7e6ced4 AV |
2037 | void sysctl_head_put(struct ctl_table_header *head) |
2038 | { | |
2039 | } | |
2040 | ||
b89a8171 EB |
2041 | #endif /* CONFIG_SYSCTL */ |
2042 | ||
1da177e4 LT |
2043 | /* |
2044 | * /proc/sys support | |
2045 | */ | |
2046 | ||
b89a8171 | 2047 | #ifdef CONFIG_PROC_SYSCTL |
1da177e4 | 2048 | |
b1ba4ddd AB |
2049 | static int _proc_do_string(void* data, int maxlen, int write, |
2050 | struct file *filp, void __user *buffer, | |
2051 | size_t *lenp, loff_t *ppos) | |
1da177e4 LT |
2052 | { |
2053 | size_t len; | |
2054 | char __user *p; | |
2055 | char c; | |
8d060877 ON |
2056 | |
2057 | if (!data || !maxlen || !*lenp) { | |
1da177e4 LT |
2058 | *lenp = 0; |
2059 | return 0; | |
2060 | } | |
8d060877 | 2061 | |
1da177e4 LT |
2062 | if (write) { |
2063 | len = 0; | |
2064 | p = buffer; | |
2065 | while (len < *lenp) { | |
2066 | if (get_user(c, p++)) | |
2067 | return -EFAULT; | |
2068 | if (c == 0 || c == '\n') | |
2069 | break; | |
2070 | len++; | |
2071 | } | |
f5dd3d6f SV |
2072 | if (len >= maxlen) |
2073 | len = maxlen-1; | |
2074 | if(copy_from_user(data, buffer, len)) | |
1da177e4 | 2075 | return -EFAULT; |
f5dd3d6f | 2076 | ((char *) data)[len] = 0; |
1da177e4 LT |
2077 | *ppos += *lenp; |
2078 | } else { | |
f5dd3d6f SV |
2079 | len = strlen(data); |
2080 | if (len > maxlen) | |
2081 | len = maxlen; | |
8d060877 ON |
2082 | |
2083 | if (*ppos > len) { | |
2084 | *lenp = 0; | |
2085 | return 0; | |
2086 | } | |
2087 | ||
2088 | data += *ppos; | |
2089 | len -= *ppos; | |
2090 | ||
1da177e4 LT |
2091 | if (len > *lenp) |
2092 | len = *lenp; | |
2093 | if (len) | |
f5dd3d6f | 2094 | if(copy_to_user(buffer, data, len)) |
1da177e4 LT |
2095 | return -EFAULT; |
2096 | if (len < *lenp) { | |
2097 | if(put_user('\n', ((char __user *) buffer) + len)) | |
2098 | return -EFAULT; | |
2099 | len++; | |
2100 | } | |
2101 | *lenp = len; | |
2102 | *ppos += len; | |
2103 | } | |
2104 | return 0; | |
2105 | } | |
2106 | ||
f5dd3d6f SV |
2107 | /** |
2108 | * proc_dostring - read a string sysctl | |
2109 | * @table: the sysctl table | |
2110 | * @write: %TRUE if this is a write to the sysctl file | |
2111 | * @filp: the file structure | |
2112 | * @buffer: the user buffer | |
2113 | * @lenp: the size of the user buffer | |
2114 | * @ppos: file position | |
2115 | * | |
2116 | * Reads/writes a string from/to the user buffer. If the kernel | |
2117 | * buffer provided is not large enough to hold the string, the | |
2118 | * string is truncated. The copied string is %NULL-terminated. | |
2119 | * If the string is being read by the user process, it is copied | |
2120 | * and a newline '\n' is added. It is truncated if the buffer is | |
2121 | * not large enough. | |
2122 | * | |
2123 | * Returns 0 on success. | |
2124 | */ | |
d8217f07 | 2125 | int proc_dostring(struct ctl_table *table, int write, struct file *filp, |
f5dd3d6f SV |
2126 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2127 | { | |
2128 | return _proc_do_string(table->data, table->maxlen, write, filp, | |
2129 | buffer, lenp, ppos); | |
2130 | } | |
2131 | ||
1da177e4 LT |
2132 | |
2133 | static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp, | |
2134 | int *valp, | |
2135 | int write, void *data) | |
2136 | { | |
2137 | if (write) { | |
2138 | *valp = *negp ? -*lvalp : *lvalp; | |
2139 | } else { | |
2140 | int val = *valp; | |
2141 | if (val < 0) { | |
2142 | *negp = -1; | |
2143 | *lvalp = (unsigned long)-val; | |
2144 | } else { | |
2145 | *negp = 0; | |
2146 | *lvalp = (unsigned long)val; | |
2147 | } | |
2148 | } | |
2149 | return 0; | |
2150 | } | |
2151 | ||
d8217f07 | 2152 | static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table, |
fcfbd547 KK |
2153 | int write, struct file *filp, void __user *buffer, |
2154 | size_t *lenp, loff_t *ppos, | |
1da177e4 LT |
2155 | int (*conv)(int *negp, unsigned long *lvalp, int *valp, |
2156 | int write, void *data), | |
2157 | void *data) | |
2158 | { | |
2159 | #define TMPBUFLEN 21 | |
2160 | int *i, vleft, first=1, neg, val; | |
2161 | unsigned long lval; | |
2162 | size_t left, len; | |
2163 | ||
2164 | char buf[TMPBUFLEN], *p; | |
2165 | char __user *s = buffer; | |
2166 | ||
fcfbd547 | 2167 | if (!tbl_data || !table->maxlen || !*lenp || |
1da177e4 LT |
2168 | (*ppos && !write)) { |
2169 | *lenp = 0; | |
2170 | return 0; | |
2171 | } | |
2172 | ||
fcfbd547 | 2173 | i = (int *) tbl_data; |
1da177e4 LT |
2174 | vleft = table->maxlen / sizeof(*i); |
2175 | left = *lenp; | |
2176 | ||
2177 | if (!conv) | |
2178 | conv = do_proc_dointvec_conv; | |
2179 | ||
2180 | for (; left && vleft--; i++, first=0) { | |
2181 | if (write) { | |
2182 | while (left) { | |
2183 | char c; | |
2184 | if (get_user(c, s)) | |
2185 | return -EFAULT; | |
2186 | if (!isspace(c)) | |
2187 | break; | |
2188 | left--; | |
2189 | s++; | |
2190 | } | |
2191 | if (!left) | |
2192 | break; | |
2193 | neg = 0; | |
2194 | len = left; | |
2195 | if (len > sizeof(buf) - 1) | |
2196 | len = sizeof(buf) - 1; | |
2197 | if (copy_from_user(buf, s, len)) | |
2198 | return -EFAULT; | |
2199 | buf[len] = 0; | |
2200 | p = buf; | |
2201 | if (*p == '-' && left > 1) { | |
2202 | neg = 1; | |
bd9b0bac | 2203 | p++; |
1da177e4 LT |
2204 | } |
2205 | if (*p < '0' || *p > '9') | |
2206 | break; | |
2207 | ||
2208 | lval = simple_strtoul(p, &p, 0); | |
2209 | ||
2210 | len = p-buf; | |
2211 | if ((len < left) && *p && !isspace(*p)) | |
2212 | break; | |
2213 | if (neg) | |
2214 | val = -val; | |
2215 | s += len; | |
2216 | left -= len; | |
2217 | ||
2218 | if (conv(&neg, &lval, i, 1, data)) | |
2219 | break; | |
2220 | } else { | |
2221 | p = buf; | |
2222 | if (!first) | |
2223 | *p++ = '\t'; | |
2224 | ||
2225 | if (conv(&neg, &lval, i, 0, data)) | |
2226 | break; | |
2227 | ||
2228 | sprintf(p, "%s%lu", neg ? "-" : "", lval); | |
2229 | len = strlen(buf); | |
2230 | if (len > left) | |
2231 | len = left; | |
2232 | if(copy_to_user(s, buf, len)) | |
2233 | return -EFAULT; | |
2234 | left -= len; | |
2235 | s += len; | |
2236 | } | |
2237 | } | |
2238 | ||
2239 | if (!write && !first && left) { | |
2240 | if(put_user('\n', s)) | |
2241 | return -EFAULT; | |
2242 | left--, s++; | |
2243 | } | |
2244 | if (write) { | |
2245 | while (left) { | |
2246 | char c; | |
2247 | if (get_user(c, s++)) | |
2248 | return -EFAULT; | |
2249 | if (!isspace(c)) | |
2250 | break; | |
2251 | left--; | |
2252 | } | |
2253 | } | |
2254 | if (write && first) | |
2255 | return -EINVAL; | |
2256 | *lenp -= left; | |
2257 | *ppos += *lenp; | |
2258 | return 0; | |
2259 | #undef TMPBUFLEN | |
2260 | } | |
2261 | ||
d8217f07 | 2262 | static int do_proc_dointvec(struct ctl_table *table, int write, struct file *filp, |
fcfbd547 KK |
2263 | void __user *buffer, size_t *lenp, loff_t *ppos, |
2264 | int (*conv)(int *negp, unsigned long *lvalp, int *valp, | |
2265 | int write, void *data), | |
2266 | void *data) | |
2267 | { | |
2268 | return __do_proc_dointvec(table->data, table, write, filp, | |
2269 | buffer, lenp, ppos, conv, data); | |
2270 | } | |
2271 | ||
1da177e4 LT |
2272 | /** |
2273 | * proc_dointvec - read a vector of integers | |
2274 | * @table: the sysctl table | |
2275 | * @write: %TRUE if this is a write to the sysctl file | |
2276 | * @filp: the file structure | |
2277 | * @buffer: the user buffer | |
2278 | * @lenp: the size of the user buffer | |
2279 | * @ppos: file position | |
2280 | * | |
2281 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer | |
2282 | * values from/to the user buffer, treated as an ASCII string. | |
2283 | * | |
2284 | * Returns 0 on success. | |
2285 | */ | |
d8217f07 | 2286 | int proc_dointvec(struct ctl_table *table, int write, struct file *filp, |
1da177e4 LT |
2287 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2288 | { | |
2289 | return do_proc_dointvec(table,write,filp,buffer,lenp,ppos, | |
2290 | NULL,NULL); | |
2291 | } | |
2292 | ||
34f5a398 | 2293 | /* |
25ddbb18 AK |
2294 | * Taint values can only be increased |
2295 | * This means we can safely use a temporary. | |
34f5a398 | 2296 | */ |
25ddbb18 | 2297 | static int proc_taint(struct ctl_table *table, int write, struct file *filp, |
34f5a398 TT |
2298 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2299 | { | |
25ddbb18 AK |
2300 | struct ctl_table t; |
2301 | unsigned long tmptaint = get_taint(); | |
2302 | int err; | |
34f5a398 | 2303 | |
91fcd412 | 2304 | if (write && !capable(CAP_SYS_ADMIN)) |
34f5a398 TT |
2305 | return -EPERM; |
2306 | ||
25ddbb18 AK |
2307 | t = *table; |
2308 | t.data = &tmptaint; | |
2309 | err = proc_doulongvec_minmax(&t, write, filp, buffer, lenp, ppos); | |
2310 | if (err < 0) | |
2311 | return err; | |
2312 | ||
2313 | if (write) { | |
2314 | /* | |
2315 | * Poor man's atomic or. Not worth adding a primitive | |
2316 | * to everyone's atomic.h for this | |
2317 | */ | |
2318 | int i; | |
2319 | for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) { | |
2320 | if ((tmptaint >> i) & 1) | |
2321 | add_taint(i); | |
2322 | } | |
2323 | } | |
2324 | ||
2325 | return err; | |
34f5a398 TT |
2326 | } |
2327 | ||
1da177e4 LT |
2328 | struct do_proc_dointvec_minmax_conv_param { |
2329 | int *min; | |
2330 | int *max; | |
2331 | }; | |
2332 | ||
2333 | static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp, | |
2334 | int *valp, | |
2335 | int write, void *data) | |
2336 | { | |
2337 | struct do_proc_dointvec_minmax_conv_param *param = data; | |
2338 | if (write) { | |
2339 | int val = *negp ? -*lvalp : *lvalp; | |
2340 | if ((param->min && *param->min > val) || | |
2341 | (param->max && *param->max < val)) | |
2342 | return -EINVAL; | |
2343 | *valp = val; | |
2344 | } else { | |
2345 | int val = *valp; | |
2346 | if (val < 0) { | |
2347 | *negp = -1; | |
2348 | *lvalp = (unsigned long)-val; | |
2349 | } else { | |
2350 | *negp = 0; | |
2351 | *lvalp = (unsigned long)val; | |
2352 | } | |
2353 | } | |
2354 | return 0; | |
2355 | } | |
2356 | ||
2357 | /** | |
2358 | * proc_dointvec_minmax - read a vector of integers with min/max values | |
2359 | * @table: the sysctl table | |
2360 | * @write: %TRUE if this is a write to the sysctl file | |
2361 | * @filp: the file structure | |
2362 | * @buffer: the user buffer | |
2363 | * @lenp: the size of the user buffer | |
2364 | * @ppos: file position | |
2365 | * | |
2366 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer | |
2367 | * values from/to the user buffer, treated as an ASCII string. | |
2368 | * | |
2369 | * This routine will ensure the values are within the range specified by | |
2370 | * table->extra1 (min) and table->extra2 (max). | |
2371 | * | |
2372 | * Returns 0 on success. | |
2373 | */ | |
d8217f07 | 2374 | int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp, |
1da177e4 LT |
2375 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2376 | { | |
2377 | struct do_proc_dointvec_minmax_conv_param param = { | |
2378 | .min = (int *) table->extra1, | |
2379 | .max = (int *) table->extra2, | |
2380 | }; | |
2381 | return do_proc_dointvec(table, write, filp, buffer, lenp, ppos, | |
2382 | do_proc_dointvec_minmax_conv, ¶m); | |
2383 | } | |
2384 | ||
d8217f07 | 2385 | static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write, |
1da177e4 LT |
2386 | struct file *filp, |
2387 | void __user *buffer, | |
2388 | size_t *lenp, loff_t *ppos, | |
2389 | unsigned long convmul, | |
2390 | unsigned long convdiv) | |
2391 | { | |
2392 | #define TMPBUFLEN 21 | |
2393 | unsigned long *i, *min, *max, val; | |
2394 | int vleft, first=1, neg; | |
2395 | size_t len, left; | |
2396 | char buf[TMPBUFLEN], *p; | |
2397 | char __user *s = buffer; | |
2398 | ||
fcfbd547 | 2399 | if (!data || !table->maxlen || !*lenp || |
1da177e4 LT |
2400 | (*ppos && !write)) { |
2401 | *lenp = 0; | |
2402 | return 0; | |
2403 | } | |
2404 | ||
fcfbd547 | 2405 | i = (unsigned long *) data; |
1da177e4 LT |
2406 | min = (unsigned long *) table->extra1; |
2407 | max = (unsigned long *) table->extra2; | |
2408 | vleft = table->maxlen / sizeof(unsigned long); | |
2409 | left = *lenp; | |
2410 | ||
2411 | for (; left && vleft--; i++, min++, max++, first=0) { | |
2412 | if (write) { | |
2413 | while (left) { | |
2414 | char c; | |
2415 | if (get_user(c, s)) | |
2416 | return -EFAULT; | |
2417 | if (!isspace(c)) | |
2418 | break; | |
2419 | left--; | |
2420 | s++; | |
2421 | } | |
2422 | if (!left) | |
2423 | break; | |
2424 | neg = 0; | |
2425 | len = left; | |
2426 | if (len > TMPBUFLEN-1) | |
2427 | len = TMPBUFLEN-1; | |
2428 | if (copy_from_user(buf, s, len)) | |
2429 | return -EFAULT; | |
2430 | buf[len] = 0; | |
2431 | p = buf; | |
2432 | if (*p == '-' && left > 1) { | |
2433 | neg = 1; | |
bd9b0bac | 2434 | p++; |
1da177e4 LT |
2435 | } |
2436 | if (*p < '0' || *p > '9') | |
2437 | break; | |
2438 | val = simple_strtoul(p, &p, 0) * convmul / convdiv ; | |
2439 | len = p-buf; | |
2440 | if ((len < left) && *p && !isspace(*p)) | |
2441 | break; | |
2442 | if (neg) | |
2443 | val = -val; | |
2444 | s += len; | |
2445 | left -= len; | |
2446 | ||
2447 | if(neg) | |
2448 | continue; | |
2449 | if ((min && val < *min) || (max && val > *max)) | |
2450 | continue; | |
2451 | *i = val; | |
2452 | } else { | |
2453 | p = buf; | |
2454 | if (!first) | |
2455 | *p++ = '\t'; | |
2456 | sprintf(p, "%lu", convdiv * (*i) / convmul); | |
2457 | len = strlen(buf); | |
2458 | if (len > left) | |
2459 | len = left; | |
2460 | if(copy_to_user(s, buf, len)) | |
2461 | return -EFAULT; | |
2462 | left -= len; | |
2463 | s += len; | |
2464 | } | |
2465 | } | |
2466 | ||
2467 | if (!write && !first && left) { | |
2468 | if(put_user('\n', s)) | |
2469 | return -EFAULT; | |
2470 | left--, s++; | |
2471 | } | |
2472 | if (write) { | |
2473 | while (left) { | |
2474 | char c; | |
2475 | if (get_user(c, s++)) | |
2476 | return -EFAULT; | |
2477 | if (!isspace(c)) | |
2478 | break; | |
2479 | left--; | |
2480 | } | |
2481 | } | |
2482 | if (write && first) | |
2483 | return -EINVAL; | |
2484 | *lenp -= left; | |
2485 | *ppos += *lenp; | |
2486 | return 0; | |
2487 | #undef TMPBUFLEN | |
2488 | } | |
2489 | ||
d8217f07 | 2490 | static int do_proc_doulongvec_minmax(struct ctl_table *table, int write, |
fcfbd547 KK |
2491 | struct file *filp, |
2492 | void __user *buffer, | |
2493 | size_t *lenp, loff_t *ppos, | |
2494 | unsigned long convmul, | |
2495 | unsigned long convdiv) | |
2496 | { | |
2497 | return __do_proc_doulongvec_minmax(table->data, table, write, | |
2498 | filp, buffer, lenp, ppos, convmul, convdiv); | |
2499 | } | |
2500 | ||
1da177e4 LT |
2501 | /** |
2502 | * proc_doulongvec_minmax - read a vector of long integers with min/max values | |
2503 | * @table: the sysctl table | |
2504 | * @write: %TRUE if this is a write to the sysctl file | |
2505 | * @filp: the file structure | |
2506 | * @buffer: the user buffer | |
2507 | * @lenp: the size of the user buffer | |
2508 | * @ppos: file position | |
2509 | * | |
2510 | * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long | |
2511 | * values from/to the user buffer, treated as an ASCII string. | |
2512 | * | |
2513 | * This routine will ensure the values are within the range specified by | |
2514 | * table->extra1 (min) and table->extra2 (max). | |
2515 | * | |
2516 | * Returns 0 on success. | |
2517 | */ | |
d8217f07 | 2518 | int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp, |
1da177e4 LT |
2519 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2520 | { | |
2521 | return do_proc_doulongvec_minmax(table, write, filp, buffer, lenp, ppos, 1l, 1l); | |
2522 | } | |
2523 | ||
2524 | /** | |
2525 | * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values | |
2526 | * @table: the sysctl table | |
2527 | * @write: %TRUE if this is a write to the sysctl file | |
2528 | * @filp: the file structure | |
2529 | * @buffer: the user buffer | |
2530 | * @lenp: the size of the user buffer | |
2531 | * @ppos: file position | |
2532 | * | |
2533 | * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long | |
2534 | * values from/to the user buffer, treated as an ASCII string. The values | |
2535 | * are treated as milliseconds, and converted to jiffies when they are stored. | |
2536 | * | |
2537 | * This routine will ensure the values are within the range specified by | |
2538 | * table->extra1 (min) and table->extra2 (max). | |
2539 | * | |
2540 | * Returns 0 on success. | |
2541 | */ | |
d8217f07 | 2542 | int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, |
1da177e4 LT |
2543 | struct file *filp, |
2544 | void __user *buffer, | |
2545 | size_t *lenp, loff_t *ppos) | |
2546 | { | |
2547 | return do_proc_doulongvec_minmax(table, write, filp, buffer, | |
2548 | lenp, ppos, HZ, 1000l); | |
2549 | } | |
2550 | ||
2551 | ||
2552 | static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp, | |
2553 | int *valp, | |
2554 | int write, void *data) | |
2555 | { | |
2556 | if (write) { | |
cba9f33d BS |
2557 | if (*lvalp > LONG_MAX / HZ) |
2558 | return 1; | |
1da177e4 LT |
2559 | *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ); |
2560 | } else { | |
2561 | int val = *valp; | |
2562 | unsigned long lval; | |
2563 | if (val < 0) { | |
2564 | *negp = -1; | |
2565 | lval = (unsigned long)-val; | |
2566 | } else { | |
2567 | *negp = 0; | |
2568 | lval = (unsigned long)val; | |
2569 | } | |
2570 | *lvalp = lval / HZ; | |
2571 | } | |
2572 | return 0; | |
2573 | } | |
2574 | ||
2575 | static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp, | |
2576 | int *valp, | |
2577 | int write, void *data) | |
2578 | { | |
2579 | if (write) { | |
cba9f33d BS |
2580 | if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ) |
2581 | return 1; | |
1da177e4 LT |
2582 | *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp); |
2583 | } else { | |
2584 | int val = *valp; | |
2585 | unsigned long lval; | |
2586 | if (val < 0) { | |
2587 | *negp = -1; | |
2588 | lval = (unsigned long)-val; | |
2589 | } else { | |
2590 | *negp = 0; | |
2591 | lval = (unsigned long)val; | |
2592 | } | |
2593 | *lvalp = jiffies_to_clock_t(lval); | |
2594 | } | |
2595 | return 0; | |
2596 | } | |
2597 | ||
2598 | static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp, | |
2599 | int *valp, | |
2600 | int write, void *data) | |
2601 | { | |
2602 | if (write) { | |
2603 | *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp); | |
2604 | } else { | |
2605 | int val = *valp; | |
2606 | unsigned long lval; | |
2607 | if (val < 0) { | |
2608 | *negp = -1; | |
2609 | lval = (unsigned long)-val; | |
2610 | } else { | |
2611 | *negp = 0; | |
2612 | lval = (unsigned long)val; | |
2613 | } | |
2614 | *lvalp = jiffies_to_msecs(lval); | |
2615 | } | |
2616 | return 0; | |
2617 | } | |
2618 | ||
2619 | /** | |
2620 | * proc_dointvec_jiffies - read a vector of integers as seconds | |
2621 | * @table: the sysctl table | |
2622 | * @write: %TRUE if this is a write to the sysctl file | |
2623 | * @filp: the file structure | |
2624 | * @buffer: the user buffer | |
2625 | * @lenp: the size of the user buffer | |
2626 | * @ppos: file position | |
2627 | * | |
2628 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer | |
2629 | * values from/to the user buffer, treated as an ASCII string. | |
2630 | * The values read are assumed to be in seconds, and are converted into | |
2631 | * jiffies. | |
2632 | * | |
2633 | * Returns 0 on success. | |
2634 | */ | |
d8217f07 | 2635 | int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp, |
1da177e4 LT |
2636 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2637 | { | |
2638 | return do_proc_dointvec(table,write,filp,buffer,lenp,ppos, | |
2639 | do_proc_dointvec_jiffies_conv,NULL); | |
2640 | } | |
2641 | ||
2642 | /** | |
2643 | * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds | |
2644 | * @table: the sysctl table | |
2645 | * @write: %TRUE if this is a write to the sysctl file | |
2646 | * @filp: the file structure | |
2647 | * @buffer: the user buffer | |
2648 | * @lenp: the size of the user buffer | |
1e5d5331 | 2649 | * @ppos: pointer to the file position |
1da177e4 LT |
2650 | * |
2651 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer | |
2652 | * values from/to the user buffer, treated as an ASCII string. | |
2653 | * The values read are assumed to be in 1/USER_HZ seconds, and | |
2654 | * are converted into jiffies. | |
2655 | * | |
2656 | * Returns 0 on success. | |
2657 | */ | |
d8217f07 | 2658 | int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp, |
1da177e4 LT |
2659 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2660 | { | |
2661 | return do_proc_dointvec(table,write,filp,buffer,lenp,ppos, | |
2662 | do_proc_dointvec_userhz_jiffies_conv,NULL); | |
2663 | } | |
2664 | ||
2665 | /** | |
2666 | * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds | |
2667 | * @table: the sysctl table | |
2668 | * @write: %TRUE if this is a write to the sysctl file | |
2669 | * @filp: the file structure | |
2670 | * @buffer: the user buffer | |
2671 | * @lenp: the size of the user buffer | |
67be2dd1 MW |
2672 | * @ppos: file position |
2673 | * @ppos: the current position in the file | |
1da177e4 LT |
2674 | * |
2675 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer | |
2676 | * values from/to the user buffer, treated as an ASCII string. | |
2677 | * The values read are assumed to be in 1/1000 seconds, and | |
2678 | * are converted into jiffies. | |
2679 | * | |
2680 | * Returns 0 on success. | |
2681 | */ | |
d8217f07 | 2682 | int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp, |
1da177e4 LT |
2683 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2684 | { | |
2685 | return do_proc_dointvec(table, write, filp, buffer, lenp, ppos, | |
2686 | do_proc_dointvec_ms_jiffies_conv, NULL); | |
2687 | } | |
2688 | ||
d8217f07 | 2689 | static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp, |
9ec52099 CLG |
2690 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2691 | { | |
2692 | struct pid *new_pid; | |
2693 | pid_t tmp; | |
2694 | int r; | |
2695 | ||
6c5f3e7b | 2696 | tmp = pid_vnr(cad_pid); |
9ec52099 CLG |
2697 | |
2698 | r = __do_proc_dointvec(&tmp, table, write, filp, buffer, | |
2699 | lenp, ppos, NULL, NULL); | |
2700 | if (r || !write) | |
2701 | return r; | |
2702 | ||
2703 | new_pid = find_get_pid(tmp); | |
2704 | if (!new_pid) | |
2705 | return -ESRCH; | |
2706 | ||
2707 | put_pid(xchg(&cad_pid, new_pid)); | |
2708 | return 0; | |
2709 | } | |
2710 | ||
1da177e4 LT |
2711 | #else /* CONFIG_PROC_FS */ |
2712 | ||
d8217f07 | 2713 | int proc_dostring(struct ctl_table *table, int write, struct file *filp, |
1da177e4 LT |
2714 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2715 | { | |
2716 | return -ENOSYS; | |
2717 | } | |
2718 | ||
d8217f07 | 2719 | int proc_dointvec(struct ctl_table *table, int write, struct file *filp, |
1da177e4 | 2720 | void __user *buffer, size_t *lenp, loff_t *ppos) |
1da177e4 LT |
2721 | { |
2722 | return -ENOSYS; | |
2723 | } | |
2724 | ||
d8217f07 | 2725 | int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp, |
1da177e4 LT |
2726 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2727 | { | |
2728 | return -ENOSYS; | |
2729 | } | |
2730 | ||
d8217f07 | 2731 | int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp, |
1da177e4 LT |
2732 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2733 | { | |
2734 | return -ENOSYS; | |
2735 | } | |
2736 | ||
d8217f07 | 2737 | int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp, |
1da177e4 LT |
2738 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2739 | { | |
2740 | return -ENOSYS; | |
2741 | } | |
2742 | ||
d8217f07 | 2743 | int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp, |
1da177e4 LT |
2744 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2745 | { | |
2746 | return -ENOSYS; | |
2747 | } | |
2748 | ||
d8217f07 | 2749 | int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp, |
1da177e4 LT |
2750 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2751 | { | |
2752 | return -ENOSYS; | |
2753 | } | |
2754 | ||
d8217f07 | 2755 | int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, |
1da177e4 LT |
2756 | struct file *filp, |
2757 | void __user *buffer, | |
2758 | size_t *lenp, loff_t *ppos) | |
2759 | { | |
2760 | return -ENOSYS; | |
2761 | } | |
2762 | ||
2763 | ||
2764 | #endif /* CONFIG_PROC_FS */ | |
2765 | ||
2766 | ||
b89a8171 | 2767 | #ifdef CONFIG_SYSCTL_SYSCALL |
1da177e4 LT |
2768 | /* |
2769 | * General sysctl support routines | |
2770 | */ | |
2771 | ||
49a0c458 | 2772 | /* The generic sysctl data routine (used if no strategy routine supplied) */ |
f221e726 | 2773 | int sysctl_data(struct ctl_table *table, |
49a0c458 EB |
2774 | void __user *oldval, size_t __user *oldlenp, |
2775 | void __user *newval, size_t newlen) | |
2776 | { | |
2777 | size_t len; | |
2778 | ||
2779 | /* Get out of I don't have a variable */ | |
2780 | if (!table->data || !table->maxlen) | |
2781 | return -ENOTDIR; | |
2782 | ||
2783 | if (oldval && oldlenp) { | |
2784 | if (get_user(len, oldlenp)) | |
2785 | return -EFAULT; | |
2786 | if (len) { | |
2787 | if (len > table->maxlen) | |
2788 | len = table->maxlen; | |
2789 | if (copy_to_user(oldval, table->data, len)) | |
2790 | return -EFAULT; | |
2791 | if (put_user(len, oldlenp)) | |
2792 | return -EFAULT; | |
2793 | } | |
2794 | } | |
2795 | ||
2796 | if (newval && newlen) { | |
2797 | if (newlen > table->maxlen) | |
2798 | newlen = table->maxlen; | |
2799 | ||
2800 | if (copy_from_user(table->data, newval, newlen)) | |
2801 | return -EFAULT; | |
2802 | } | |
2803 | return 1; | |
2804 | } | |
2805 | ||
1da177e4 | 2806 | /* The generic string strategy routine: */ |
f221e726 | 2807 | int sysctl_string(struct ctl_table *table, |
1da177e4 | 2808 | void __user *oldval, size_t __user *oldlenp, |
1f29bcd7 | 2809 | void __user *newval, size_t newlen) |
1da177e4 | 2810 | { |
1da177e4 LT |
2811 | if (!table->data || !table->maxlen) |
2812 | return -ENOTDIR; | |
2813 | ||
2814 | if (oldval && oldlenp) { | |
de9e007d LT |
2815 | size_t bufsize; |
2816 | if (get_user(bufsize, oldlenp)) | |
1da177e4 | 2817 | return -EFAULT; |
de9e007d LT |
2818 | if (bufsize) { |
2819 | size_t len = strlen(table->data), copied; | |
2820 | ||
2821 | /* This shouldn't trigger for a well-formed sysctl */ | |
2822 | if (len > table->maxlen) | |
1da177e4 | 2823 | len = table->maxlen; |
de9e007d LT |
2824 | |
2825 | /* Copy up to a max of bufsize-1 bytes of the string */ | |
2826 | copied = (len >= bufsize) ? bufsize - 1 : len; | |
2827 | ||
2828 | if (copy_to_user(oldval, table->data, copied) || | |
2829 | put_user(0, (char __user *)(oldval + copied))) | |
1da177e4 | 2830 | return -EFAULT; |
de9e007d | 2831 | if (put_user(len, oldlenp)) |
1da177e4 LT |
2832 | return -EFAULT; |
2833 | } | |
2834 | } | |
2835 | if (newval && newlen) { | |
de9e007d | 2836 | size_t len = newlen; |
1da177e4 LT |
2837 | if (len > table->maxlen) |
2838 | len = table->maxlen; | |
2839 | if(copy_from_user(table->data, newval, len)) | |
2840 | return -EFAULT; | |
2841 | if (len == table->maxlen) | |
2842 | len--; | |
2843 | ((char *) table->data)[len] = 0; | |
2844 | } | |
82c9df82 | 2845 | return 1; |
1da177e4 LT |
2846 | } |
2847 | ||
2848 | /* | |
2849 | * This function makes sure that all of the integers in the vector | |
2850 | * are between the minimum and maximum values given in the arrays | |
2851 | * table->extra1 and table->extra2, respectively. | |
2852 | */ | |
f221e726 | 2853 | int sysctl_intvec(struct ctl_table *table, |
1da177e4 | 2854 | void __user *oldval, size_t __user *oldlenp, |
1f29bcd7 | 2855 | void __user *newval, size_t newlen) |
1da177e4 LT |
2856 | { |
2857 | ||
2858 | if (newval && newlen) { | |
2859 | int __user *vec = (int __user *) newval; | |
2860 | int *min = (int *) table->extra1; | |
2861 | int *max = (int *) table->extra2; | |
2862 | size_t length; | |
2863 | int i; | |
2864 | ||
2865 | if (newlen % sizeof(int) != 0) | |
2866 | return -EINVAL; | |
2867 | ||
2868 | if (!table->extra1 && !table->extra2) | |
2869 | return 0; | |
2870 | ||
2871 | if (newlen > table->maxlen) | |
2872 | newlen = table->maxlen; | |
2873 | length = newlen / sizeof(int); | |
2874 | ||
2875 | for (i = 0; i < length; i++) { | |
2876 | int value; | |
2877 | if (get_user(value, vec + i)) | |
2878 | return -EFAULT; | |
2879 | if (min && value < min[i]) | |
2880 | return -EINVAL; | |
2881 | if (max && value > max[i]) | |
2882 | return -EINVAL; | |
2883 | } | |
2884 | } | |
2885 | return 0; | |
2886 | } | |
2887 | ||
2888 | /* Strategy function to convert jiffies to seconds */ | |
f221e726 | 2889 | int sysctl_jiffies(struct ctl_table *table, |
1da177e4 | 2890 | void __user *oldval, size_t __user *oldlenp, |
1f29bcd7 | 2891 | void __user *newval, size_t newlen) |
1da177e4 | 2892 | { |
3ee75ac3 | 2893 | if (oldval && oldlenp) { |
1da177e4 | 2894 | size_t olen; |
3ee75ac3 AD |
2895 | |
2896 | if (get_user(olen, oldlenp)) | |
2897 | return -EFAULT; | |
2898 | if (olen) { | |
2899 | int val; | |
2900 | ||
2901 | if (olen < sizeof(int)) | |
2902 | return -EINVAL; | |
2903 | ||
2904 | val = *(int *)(table->data) / HZ; | |
2905 | if (put_user(val, (int __user *)oldval)) | |
2906 | return -EFAULT; | |
2907 | if (put_user(sizeof(int), oldlenp)) | |
1da177e4 | 2908 | return -EFAULT; |
1da177e4 | 2909 | } |
1da177e4 LT |
2910 | } |
2911 | if (newval && newlen) { | |
2912 | int new; | |
2913 | if (newlen != sizeof(int)) | |
2914 | return -EINVAL; | |
2915 | if (get_user(new, (int __user *)newval)) | |
2916 | return -EFAULT; | |
2917 | *(int *)(table->data) = new*HZ; | |
2918 | } | |
2919 | return 1; | |
2920 | } | |
2921 | ||
2922 | /* Strategy function to convert jiffies to seconds */ | |
f221e726 | 2923 | int sysctl_ms_jiffies(struct ctl_table *table, |
1da177e4 | 2924 | void __user *oldval, size_t __user *oldlenp, |
1f29bcd7 | 2925 | void __user *newval, size_t newlen) |
1da177e4 | 2926 | { |
3ee75ac3 | 2927 | if (oldval && oldlenp) { |
1da177e4 | 2928 | size_t olen; |
3ee75ac3 AD |
2929 | |
2930 | if (get_user(olen, oldlenp)) | |
2931 | return -EFAULT; | |
2932 | if (olen) { | |
2933 | int val; | |
2934 | ||
2935 | if (olen < sizeof(int)) | |
2936 | return -EINVAL; | |
2937 | ||
2938 | val = jiffies_to_msecs(*(int *)(table->data)); | |
2939 | if (put_user(val, (int __user *)oldval)) | |
2940 | return -EFAULT; | |
2941 | if (put_user(sizeof(int), oldlenp)) | |
1da177e4 | 2942 | return -EFAULT; |
1da177e4 | 2943 | } |
1da177e4 LT |
2944 | } |
2945 | if (newval && newlen) { | |
2946 | int new; | |
2947 | if (newlen != sizeof(int)) | |
2948 | return -EINVAL; | |
2949 | if (get_user(new, (int __user *)newval)) | |
2950 | return -EFAULT; | |
2951 | *(int *)(table->data) = msecs_to_jiffies(new); | |
2952 | } | |
2953 | return 1; | |
2954 | } | |
2955 | ||
c4b8b769 | 2956 | |
c4b8b769 | 2957 | |
b89a8171 | 2958 | #else /* CONFIG_SYSCTL_SYSCALL */ |
1da177e4 LT |
2959 | |
2960 | ||
2961 | asmlinkage long sys_sysctl(struct __sysctl_args __user *args) | |
2962 | { | |
0e009be8 | 2963 | struct __sysctl_args tmp; |
7058cb02 | 2964 | int error; |
0e009be8 | 2965 | |
0e009be8 EB |
2966 | if (copy_from_user(&tmp, args, sizeof(tmp))) |
2967 | return -EFAULT; | |
0e009be8 | 2968 | |
7058cb02 | 2969 | error = deprecated_sysctl_warning(&tmp); |
b89a8171 | 2970 | |
7058cb02 EB |
2971 | /* If no error reading the parameters then just -ENOSYS ... */ |
2972 | if (!error) | |
2973 | error = -ENOSYS; | |
2974 | ||
2975 | return error; | |
1da177e4 LT |
2976 | } |
2977 | ||
f221e726 | 2978 | int sysctl_data(struct ctl_table *table, |
49a0c458 EB |
2979 | void __user *oldval, size_t __user *oldlenp, |
2980 | void __user *newval, size_t newlen) | |
2981 | { | |
2982 | return -ENOSYS; | |
2983 | } | |
2984 | ||
f221e726 | 2985 | int sysctl_string(struct ctl_table *table, |
1da177e4 | 2986 | void __user *oldval, size_t __user *oldlenp, |
1f29bcd7 | 2987 | void __user *newval, size_t newlen) |
1da177e4 LT |
2988 | { |
2989 | return -ENOSYS; | |
2990 | } | |
2991 | ||
f221e726 | 2992 | int sysctl_intvec(struct ctl_table *table, |
1da177e4 | 2993 | void __user *oldval, size_t __user *oldlenp, |
1f29bcd7 | 2994 | void __user *newval, size_t newlen) |
1da177e4 LT |
2995 | { |
2996 | return -ENOSYS; | |
2997 | } | |
2998 | ||
f221e726 | 2999 | int sysctl_jiffies(struct ctl_table *table, |
1da177e4 | 3000 | void __user *oldval, size_t __user *oldlenp, |
1f29bcd7 | 3001 | void __user *newval, size_t newlen) |
1da177e4 LT |
3002 | { |
3003 | return -ENOSYS; | |
3004 | } | |
3005 | ||
f221e726 | 3006 | int sysctl_ms_jiffies(struct ctl_table *table, |
1da177e4 | 3007 | void __user *oldval, size_t __user *oldlenp, |
1f29bcd7 | 3008 | void __user *newval, size_t newlen) |
1da177e4 LT |
3009 | { |
3010 | return -ENOSYS; | |
3011 | } | |
3012 | ||
b89a8171 | 3013 | #endif /* CONFIG_SYSCTL_SYSCALL */ |
1da177e4 | 3014 | |
7058cb02 EB |
3015 | static int deprecated_sysctl_warning(struct __sysctl_args *args) |
3016 | { | |
3017 | static int msg_count; | |
3018 | int name[CTL_MAXNAME]; | |
3019 | int i; | |
3020 | ||
6fc48af8 TH |
3021 | /* Check args->nlen. */ |
3022 | if (args->nlen < 0 || args->nlen > CTL_MAXNAME) | |
3023 | return -ENOTDIR; | |
3024 | ||
7058cb02 EB |
3025 | /* Read in the sysctl name for better debug message logging */ |
3026 | for (i = 0; i < args->nlen; i++) | |
3027 | if (get_user(name[i], args->name + i)) | |
3028 | return -EFAULT; | |
3029 | ||
3030 | /* Ignore accesses to kernel.version */ | |
3031 | if ((args->nlen == 2) && (name[0] == CTL_KERN) && (name[1] == KERN_VERSION)) | |
3032 | return 0; | |
3033 | ||
3034 | if (msg_count < 5) { | |
3035 | msg_count++; | |
3036 | printk(KERN_INFO | |
3037 | "warning: process `%s' used the deprecated sysctl " | |
3038 | "system call with ", current->comm); | |
3039 | for (i = 0; i < args->nlen; i++) | |
3040 | printk("%d.", name[i]); | |
3041 | printk("\n"); | |
3042 | } | |
3043 | return 0; | |
3044 | } | |
3045 | ||
1da177e4 LT |
3046 | /* |
3047 | * No sense putting this after each symbol definition, twice, | |
3048 | * exception granted :-) | |
3049 | */ | |
3050 | EXPORT_SYMBOL(proc_dointvec); | |
3051 | EXPORT_SYMBOL(proc_dointvec_jiffies); | |
3052 | EXPORT_SYMBOL(proc_dointvec_minmax); | |
3053 | EXPORT_SYMBOL(proc_dointvec_userhz_jiffies); | |
3054 | EXPORT_SYMBOL(proc_dointvec_ms_jiffies); | |
3055 | EXPORT_SYMBOL(proc_dostring); | |
3056 | EXPORT_SYMBOL(proc_doulongvec_minmax); | |
3057 | EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax); | |
3058 | EXPORT_SYMBOL(register_sysctl_table); | |
29e796fd | 3059 | EXPORT_SYMBOL(register_sysctl_paths); |
1da177e4 LT |
3060 | EXPORT_SYMBOL(sysctl_intvec); |
3061 | EXPORT_SYMBOL(sysctl_jiffies); | |
3062 | EXPORT_SYMBOL(sysctl_ms_jiffies); | |
3063 | EXPORT_SYMBOL(sysctl_string); | |
49a0c458 | 3064 | EXPORT_SYMBOL(sysctl_data); |
1da177e4 | 3065 | EXPORT_SYMBOL(unregister_sysctl_table); |