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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * sysctl.c: General linux system control interface | |
3 | * | |
4 | * Begun 24 March 1995, Stephen Tweedie | |
5 | * Added /proc support, Dec 1995 | |
6 | * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas. | |
7 | * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver. | |
8 | * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver. | |
9 | * Dynamic registration fixes, Stephen Tweedie. | |
10 | * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn. | |
11 | * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris | |
12 | * Horn. | |
13 | * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer. | |
14 | * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer. | |
15 | * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill | |
16 | * Wendling. | |
17 | * The list_for_each() macro wasn't appropriate for the sysctl loop. | |
18 | * Removed it and replaced it with older style, 03/23/00, Bill Wendling | |
19 | */ | |
20 | ||
1da177e4 LT |
21 | #include <linux/module.h> |
22 | #include <linux/mm.h> | |
23 | #include <linux/swap.h> | |
24 | #include <linux/slab.h> | |
25 | #include <linux/sysctl.h> | |
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; |
5096add8 | 83 | extern int maps_protect; |
9745512c | 84 | extern int latencytop_enabled; |
eceea0b3 | 85 | extern int sysctl_nr_open_min, sysctl_nr_open_max; |
31a72bce PM |
86 | #ifdef CONFIG_RCU_TORTURE_TEST |
87 | extern int rcutorture_runnable; | |
88 | #endif /* #ifdef CONFIG_RCU_TORTURE_TEST */ | |
1da177e4 | 89 | |
c4f3b63f | 90 | /* Constants used for minimum and maximum */ |
1c4cd6dd | 91 | #if defined(CONFIG_HIGHMEM) || defined(CONFIG_DETECT_SOFTLOCKUP) |
c4f3b63f | 92 | static int one = 1; |
195cf453 BG |
93 | #endif |
94 | ||
95 | #ifdef CONFIG_DETECT_SOFTLOCKUP | |
c4f3b63f | 96 | static int sixty = 60; |
9383d967 | 97 | static int neg_one = -1; |
c4f3b63f RT |
98 | #endif |
99 | ||
100 | #ifdef CONFIG_MMU | |
101 | static int two = 2; | |
102 | #endif | |
103 | ||
104 | static int zero; | |
105 | static int one_hundred = 100; | |
106 | ||
1da177e4 LT |
107 | /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */ |
108 | static int maxolduid = 65535; | |
109 | static int minolduid; | |
8ad4b1fb | 110 | static int min_percpu_pagelist_fract = 8; |
1da177e4 LT |
111 | |
112 | static int ngroups_max = NGROUPS_MAX; | |
113 | ||
a1ef5adb | 114 | #ifdef CONFIG_MODULES |
1da177e4 LT |
115 | extern char modprobe_path[]; |
116 | #endif | |
1da177e4 LT |
117 | #ifdef CONFIG_CHR_DEV_SG |
118 | extern int sg_big_buff; | |
119 | #endif | |
1da177e4 LT |
120 | |
121 | #ifdef __sparc__ | |
122 | extern char reboot_command []; | |
123 | extern int stop_a_enabled; | |
124 | extern int scons_pwroff; | |
125 | #endif | |
126 | ||
127 | #ifdef __hppa__ | |
128 | extern int pwrsw_enabled; | |
129 | extern int unaligned_enabled; | |
130 | #endif | |
131 | ||
347a8dc3 | 132 | #ifdef CONFIG_S390 |
1da177e4 LT |
133 | #ifdef CONFIG_MATHEMU |
134 | extern int sysctl_ieee_emulation_warnings; | |
135 | #endif | |
136 | extern int sysctl_userprocess_debug; | |
951f22d5 | 137 | extern int spin_retry; |
1da177e4 LT |
138 | #endif |
139 | ||
1da177e4 LT |
140 | #ifdef CONFIG_BSD_PROCESS_ACCT |
141 | extern int acct_parm[]; | |
142 | #endif | |
143 | ||
d2b176ed JS |
144 | #ifdef CONFIG_IA64 |
145 | extern int no_unaligned_warning; | |
146 | #endif | |
147 | ||
23f78d4a IM |
148 | #ifdef CONFIG_RT_MUTEXES |
149 | extern int max_lock_depth; | |
150 | #endif | |
151 | ||
d6f8ff73 | 152 | #ifdef CONFIG_PROC_SYSCTL |
d8217f07 | 153 | static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp, |
9ec52099 | 154 | void __user *buffer, size_t *lenp, loff_t *ppos); |
d8217f07 | 155 | static int proc_dointvec_taint(struct ctl_table *table, int write, struct file *filp, |
34f5a398 | 156 | void __user *buffer, size_t *lenp, loff_t *ppos); |
d6f8ff73 | 157 | #endif |
9ec52099 | 158 | |
d8217f07 | 159 | static struct ctl_table root_table[]; |
e51b6ba0 EB |
160 | static struct ctl_table_root sysctl_table_root; |
161 | static struct ctl_table_header root_table_header = { | |
b380b0d4 | 162 | .count = 1, |
e51b6ba0 | 163 | .ctl_table = root_table, |
73455092 | 164 | .ctl_entry = LIST_HEAD_INIT(sysctl_table_root.default_set.list), |
e51b6ba0 | 165 | .root = &sysctl_table_root, |
73455092 | 166 | .set = &sysctl_table_root.default_set, |
e51b6ba0 EB |
167 | }; |
168 | static struct ctl_table_root sysctl_table_root = { | |
169 | .root_list = LIST_HEAD_INIT(sysctl_table_root.root_list), | |
73455092 | 170 | .default_set.list = LIST_HEAD_INIT(root_table_header.ctl_entry), |
e51b6ba0 | 171 | }; |
1da177e4 | 172 | |
d8217f07 EB |
173 | static struct ctl_table kern_table[]; |
174 | static struct ctl_table vm_table[]; | |
175 | static struct ctl_table fs_table[]; | |
176 | static struct ctl_table debug_table[]; | |
177 | static struct ctl_table dev_table[]; | |
178 | extern struct ctl_table random_table[]; | |
2d9048e2 | 179 | #ifdef CONFIG_INOTIFY_USER |
d8217f07 | 180 | extern struct ctl_table inotify_table[]; |
0399cb08 | 181 | #endif |
1da177e4 LT |
182 | |
183 | #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT | |
184 | int sysctl_legacy_va_layout; | |
185 | #endif | |
186 | ||
f20786ff PZ |
187 | extern int prove_locking; |
188 | extern int lock_stat; | |
9bc9a6bd | 189 | |
1da177e4 LT |
190 | /* The default sysctl tables: */ |
191 | ||
d8217f07 | 192 | static struct ctl_table root_table[] = { |
1da177e4 LT |
193 | { |
194 | .ctl_name = CTL_KERN, | |
195 | .procname = "kernel", | |
196 | .mode = 0555, | |
197 | .child = kern_table, | |
198 | }, | |
199 | { | |
200 | .ctl_name = CTL_VM, | |
201 | .procname = "vm", | |
202 | .mode = 0555, | |
203 | .child = vm_table, | |
204 | }, | |
1da177e4 LT |
205 | { |
206 | .ctl_name = CTL_FS, | |
207 | .procname = "fs", | |
208 | .mode = 0555, | |
209 | .child = fs_table, | |
210 | }, | |
211 | { | |
212 | .ctl_name = CTL_DEBUG, | |
213 | .procname = "debug", | |
214 | .mode = 0555, | |
215 | .child = debug_table, | |
216 | }, | |
217 | { | |
218 | .ctl_name = CTL_DEV, | |
219 | .procname = "dev", | |
220 | .mode = 0555, | |
221 | .child = dev_table, | |
222 | }, | |
2be7fe07 AM |
223 | /* |
224 | * NOTE: do not add new entries to this table unless you have read | |
225 | * Documentation/sysctl/ctl_unnumbered.txt | |
226 | */ | |
1da177e4 LT |
227 | { .ctl_name = 0 } |
228 | }; | |
229 | ||
77e54a1f | 230 | #ifdef CONFIG_SCHED_DEBUG |
73c4efd2 ED |
231 | static int min_sched_granularity_ns = 100000; /* 100 usecs */ |
232 | static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */ | |
233 | static int min_wakeup_granularity_ns; /* 0 usecs */ | |
234 | static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */ | |
77e54a1f IM |
235 | #endif |
236 | ||
d8217f07 | 237 | static struct ctl_table kern_table[] = { |
77e54a1f IM |
238 | #ifdef CONFIG_SCHED_DEBUG |
239 | { | |
240 | .ctl_name = CTL_UNNUMBERED, | |
b2be5e96 PZ |
241 | .procname = "sched_min_granularity_ns", |
242 | .data = &sysctl_sched_min_granularity, | |
77e54a1f IM |
243 | .maxlen = sizeof(unsigned int), |
244 | .mode = 0644, | |
b2be5e96 PZ |
245 | .proc_handler = &sched_nr_latency_handler, |
246 | .strategy = &sysctl_intvec, | |
247 | .extra1 = &min_sched_granularity_ns, | |
248 | .extra2 = &max_sched_granularity_ns, | |
77e54a1f | 249 | }, |
21805085 PZ |
250 | { |
251 | .ctl_name = CTL_UNNUMBERED, | |
252 | .procname = "sched_latency_ns", | |
253 | .data = &sysctl_sched_latency, | |
254 | .maxlen = sizeof(unsigned int), | |
255 | .mode = 0644, | |
b2be5e96 | 256 | .proc_handler = &sched_nr_latency_handler, |
21805085 PZ |
257 | .strategy = &sysctl_intvec, |
258 | .extra1 = &min_sched_granularity_ns, | |
259 | .extra2 = &max_sched_granularity_ns, | |
260 | }, | |
77e54a1f IM |
261 | { |
262 | .ctl_name = CTL_UNNUMBERED, | |
263 | .procname = "sched_wakeup_granularity_ns", | |
264 | .data = &sysctl_sched_wakeup_granularity, | |
265 | .maxlen = sizeof(unsigned int), | |
266 | .mode = 0644, | |
267 | .proc_handler = &proc_dointvec_minmax, | |
268 | .strategy = &sysctl_intvec, | |
77e54a1f IM |
269 | .extra1 = &min_wakeup_granularity_ns, |
270 | .extra2 = &max_wakeup_granularity_ns, | |
271 | }, | |
2398f2c6 PZ |
272 | { |
273 | .ctl_name = CTL_UNNUMBERED, | |
274 | .procname = "sched_shares_ratelimit", | |
275 | .data = &sysctl_sched_shares_ratelimit, | |
276 | .maxlen = sizeof(unsigned int), | |
277 | .mode = 0644, | |
278 | .proc_handler = &proc_dointvec, | |
279 | }, | |
77e54a1f IM |
280 | { |
281 | .ctl_name = CTL_UNNUMBERED, | |
282 | .procname = "sched_child_runs_first", | |
283 | .data = &sysctl_sched_child_runs_first, | |
284 | .maxlen = sizeof(unsigned int), | |
285 | .mode = 0644, | |
286 | .proc_handler = &proc_dointvec, | |
287 | }, | |
1fc84aaa PZ |
288 | { |
289 | .ctl_name = CTL_UNNUMBERED, | |
290 | .procname = "sched_features", | |
291 | .data = &sysctl_sched_features, | |
292 | .maxlen = sizeof(unsigned int), | |
293 | .mode = 0644, | |
294 | .proc_handler = &proc_dointvec, | |
295 | }, | |
da84d961 IM |
296 | { |
297 | .ctl_name = CTL_UNNUMBERED, | |
298 | .procname = "sched_migration_cost", | |
299 | .data = &sysctl_sched_migration_cost, | |
300 | .maxlen = sizeof(unsigned int), | |
301 | .mode = 0644, | |
302 | .proc_handler = &proc_dointvec, | |
303 | }, | |
b82d9fdd PZ |
304 | { |
305 | .ctl_name = CTL_UNNUMBERED, | |
306 | .procname = "sched_nr_migrate", | |
307 | .data = &sysctl_sched_nr_migrate, | |
308 | .maxlen = sizeof(unsigned int), | |
fa85ae24 PZ |
309 | .mode = 0644, |
310 | .proc_handler = &proc_dointvec, | |
311 | }, | |
1fc84aaa | 312 | #endif |
9f0c1e56 PZ |
313 | { |
314 | .ctl_name = CTL_UNNUMBERED, | |
315 | .procname = "sched_rt_period_us", | |
316 | .data = &sysctl_sched_rt_period, | |
317 | .maxlen = sizeof(unsigned int), | |
318 | .mode = 0644, | |
d0b27fa7 | 319 | .proc_handler = &sched_rt_handler, |
9f0c1e56 PZ |
320 | }, |
321 | { | |
322 | .ctl_name = CTL_UNNUMBERED, | |
323 | .procname = "sched_rt_runtime_us", | |
324 | .data = &sysctl_sched_rt_runtime, | |
325 | .maxlen = sizeof(int), | |
326 | .mode = 0644, | |
d0b27fa7 | 327 | .proc_handler = &sched_rt_handler, |
9f0c1e56 | 328 | }, |
1799e35d IM |
329 | { |
330 | .ctl_name = CTL_UNNUMBERED, | |
331 | .procname = "sched_compat_yield", | |
332 | .data = &sysctl_sched_compat_yield, | |
333 | .maxlen = sizeof(unsigned int), | |
334 | .mode = 0644, | |
335 | .proc_handler = &proc_dointvec, | |
336 | }, | |
f20786ff PZ |
337 | #ifdef CONFIG_PROVE_LOCKING |
338 | { | |
339 | .ctl_name = CTL_UNNUMBERED, | |
340 | .procname = "prove_locking", | |
341 | .data = &prove_locking, | |
342 | .maxlen = sizeof(int), | |
343 | .mode = 0644, | |
344 | .proc_handler = &proc_dointvec, | |
345 | }, | |
346 | #endif | |
347 | #ifdef CONFIG_LOCK_STAT | |
348 | { | |
349 | .ctl_name = CTL_UNNUMBERED, | |
350 | .procname = "lock_stat", | |
351 | .data = &lock_stat, | |
352 | .maxlen = sizeof(int), | |
353 | .mode = 0644, | |
354 | .proc_handler = &proc_dointvec, | |
355 | }, | |
77e54a1f | 356 | #endif |
1da177e4 LT |
357 | { |
358 | .ctl_name = KERN_PANIC, | |
359 | .procname = "panic", | |
360 | .data = &panic_timeout, | |
361 | .maxlen = sizeof(int), | |
362 | .mode = 0644, | |
363 | .proc_handler = &proc_dointvec, | |
364 | }, | |
365 | { | |
366 | .ctl_name = KERN_CORE_USES_PID, | |
367 | .procname = "core_uses_pid", | |
368 | .data = &core_uses_pid, | |
369 | .maxlen = sizeof(int), | |
370 | .mode = 0644, | |
371 | .proc_handler = &proc_dointvec, | |
372 | }, | |
373 | { | |
374 | .ctl_name = KERN_CORE_PATTERN, | |
375 | .procname = "core_pattern", | |
376 | .data = core_pattern, | |
71ce92f3 | 377 | .maxlen = CORENAME_MAX_SIZE, |
1da177e4 LT |
378 | .mode = 0644, |
379 | .proc_handler = &proc_dostring, | |
380 | .strategy = &sysctl_string, | |
381 | }, | |
34f5a398 | 382 | #ifdef CONFIG_PROC_SYSCTL |
1da177e4 | 383 | { |
1da177e4 LT |
384 | .procname = "tainted", |
385 | .data = &tainted, | |
386 | .maxlen = sizeof(int), | |
34f5a398 TT |
387 | .mode = 0644, |
388 | .proc_handler = &proc_dointvec_taint, | |
1da177e4 | 389 | }, |
34f5a398 | 390 | #endif |
9745512c AV |
391 | #ifdef CONFIG_LATENCYTOP |
392 | { | |
393 | .procname = "latencytop", | |
394 | .data = &latencytop_enabled, | |
395 | .maxlen = sizeof(int), | |
396 | .mode = 0644, | |
397 | .proc_handler = &proc_dointvec, | |
398 | }, | |
399 | #endif | |
1da177e4 LT |
400 | #ifdef CONFIG_BLK_DEV_INITRD |
401 | { | |
402 | .ctl_name = KERN_REALROOTDEV, | |
403 | .procname = "real-root-dev", | |
404 | .data = &real_root_dev, | |
405 | .maxlen = sizeof(int), | |
406 | .mode = 0644, | |
407 | .proc_handler = &proc_dointvec, | |
408 | }, | |
409 | #endif | |
45807a1d IM |
410 | { |
411 | .ctl_name = CTL_UNNUMBERED, | |
412 | .procname = "print-fatal-signals", | |
413 | .data = &print_fatal_signals, | |
414 | .maxlen = sizeof(int), | |
415 | .mode = 0644, | |
416 | .proc_handler = &proc_dointvec, | |
417 | }, | |
1da177e4 LT |
418 | #ifdef __sparc__ |
419 | { | |
420 | .ctl_name = KERN_SPARC_REBOOT, | |
421 | .procname = "reboot-cmd", | |
422 | .data = reboot_command, | |
423 | .maxlen = 256, | |
424 | .mode = 0644, | |
425 | .proc_handler = &proc_dostring, | |
426 | .strategy = &sysctl_string, | |
427 | }, | |
428 | { | |
429 | .ctl_name = KERN_SPARC_STOP_A, | |
430 | .procname = "stop-a", | |
431 | .data = &stop_a_enabled, | |
432 | .maxlen = sizeof (int), | |
433 | .mode = 0644, | |
434 | .proc_handler = &proc_dointvec, | |
435 | }, | |
436 | { | |
437 | .ctl_name = KERN_SPARC_SCONS_PWROFF, | |
438 | .procname = "scons-poweroff", | |
439 | .data = &scons_pwroff, | |
440 | .maxlen = sizeof (int), | |
441 | .mode = 0644, | |
442 | .proc_handler = &proc_dointvec, | |
443 | }, | |
444 | #endif | |
445 | #ifdef __hppa__ | |
446 | { | |
447 | .ctl_name = KERN_HPPA_PWRSW, | |
448 | .procname = "soft-power", | |
449 | .data = &pwrsw_enabled, | |
450 | .maxlen = sizeof (int), | |
451 | .mode = 0644, | |
452 | .proc_handler = &proc_dointvec, | |
453 | }, | |
454 | { | |
455 | .ctl_name = KERN_HPPA_UNALIGNED, | |
456 | .procname = "unaligned-trap", | |
457 | .data = &unaligned_enabled, | |
458 | .maxlen = sizeof (int), | |
459 | .mode = 0644, | |
460 | .proc_handler = &proc_dointvec, | |
461 | }, | |
462 | #endif | |
463 | { | |
464 | .ctl_name = KERN_CTLALTDEL, | |
465 | .procname = "ctrl-alt-del", | |
466 | .data = &C_A_D, | |
467 | .maxlen = sizeof(int), | |
468 | .mode = 0644, | |
469 | .proc_handler = &proc_dointvec, | |
470 | }, | |
b0fc494f SR |
471 | #ifdef CONFIG_FTRACE |
472 | { | |
473 | .ctl_name = CTL_UNNUMBERED, | |
474 | .procname = "ftrace_enabled", | |
475 | .data = &ftrace_enabled, | |
476 | .maxlen = sizeof(int), | |
477 | .mode = 0644, | |
478 | .proc_handler = &ftrace_enable_sysctl, | |
479 | }, | |
480 | #endif | |
a1ef5adb | 481 | #ifdef CONFIG_MODULES |
1da177e4 LT |
482 | { |
483 | .ctl_name = KERN_MODPROBE, | |
484 | .procname = "modprobe", | |
485 | .data = &modprobe_path, | |
486 | .maxlen = KMOD_PATH_LEN, | |
487 | .mode = 0644, | |
488 | .proc_handler = &proc_dostring, | |
489 | .strategy = &sysctl_string, | |
490 | }, | |
491 | #endif | |
57ae2508 | 492 | #if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET) |
1da177e4 LT |
493 | { |
494 | .ctl_name = KERN_HOTPLUG, | |
495 | .procname = "hotplug", | |
312c004d KS |
496 | .data = &uevent_helper, |
497 | .maxlen = UEVENT_HELPER_PATH_LEN, | |
1da177e4 LT |
498 | .mode = 0644, |
499 | .proc_handler = &proc_dostring, | |
500 | .strategy = &sysctl_string, | |
501 | }, | |
502 | #endif | |
503 | #ifdef CONFIG_CHR_DEV_SG | |
504 | { | |
505 | .ctl_name = KERN_SG_BIG_BUFF, | |
506 | .procname = "sg-big-buff", | |
507 | .data = &sg_big_buff, | |
508 | .maxlen = sizeof (int), | |
509 | .mode = 0444, | |
510 | .proc_handler = &proc_dointvec, | |
511 | }, | |
512 | #endif | |
513 | #ifdef CONFIG_BSD_PROCESS_ACCT | |
514 | { | |
515 | .ctl_name = KERN_ACCT, | |
516 | .procname = "acct", | |
517 | .data = &acct_parm, | |
518 | .maxlen = 3*sizeof(int), | |
519 | .mode = 0644, | |
520 | .proc_handler = &proc_dointvec, | |
521 | }, | |
522 | #endif | |
1da177e4 LT |
523 | #ifdef CONFIG_MAGIC_SYSRQ |
524 | { | |
525 | .ctl_name = KERN_SYSRQ, | |
526 | .procname = "sysrq", | |
5d6f647f | 527 | .data = &__sysrq_enabled, |
1da177e4 LT |
528 | .maxlen = sizeof (int), |
529 | .mode = 0644, | |
530 | .proc_handler = &proc_dointvec, | |
531 | }, | |
532 | #endif | |
d6f8ff73 | 533 | #ifdef CONFIG_PROC_SYSCTL |
1da177e4 | 534 | { |
1da177e4 | 535 | .procname = "cad_pid", |
9ec52099 | 536 | .data = NULL, |
1da177e4 LT |
537 | .maxlen = sizeof (int), |
538 | .mode = 0600, | |
9ec52099 | 539 | .proc_handler = &proc_do_cad_pid, |
1da177e4 | 540 | }, |
d6f8ff73 | 541 | #endif |
1da177e4 LT |
542 | { |
543 | .ctl_name = KERN_MAX_THREADS, | |
544 | .procname = "threads-max", | |
545 | .data = &max_threads, | |
546 | .maxlen = sizeof(int), | |
547 | .mode = 0644, | |
548 | .proc_handler = &proc_dointvec, | |
549 | }, | |
550 | { | |
551 | .ctl_name = KERN_RANDOM, | |
552 | .procname = "random", | |
553 | .mode = 0555, | |
554 | .child = random_table, | |
555 | }, | |
1da177e4 LT |
556 | { |
557 | .ctl_name = KERN_OVERFLOWUID, | |
558 | .procname = "overflowuid", | |
559 | .data = &overflowuid, | |
560 | .maxlen = sizeof(int), | |
561 | .mode = 0644, | |
562 | .proc_handler = &proc_dointvec_minmax, | |
563 | .strategy = &sysctl_intvec, | |
564 | .extra1 = &minolduid, | |
565 | .extra2 = &maxolduid, | |
566 | }, | |
567 | { | |
568 | .ctl_name = KERN_OVERFLOWGID, | |
569 | .procname = "overflowgid", | |
570 | .data = &overflowgid, | |
571 | .maxlen = sizeof(int), | |
572 | .mode = 0644, | |
573 | .proc_handler = &proc_dointvec_minmax, | |
574 | .strategy = &sysctl_intvec, | |
575 | .extra1 = &minolduid, | |
576 | .extra2 = &maxolduid, | |
577 | }, | |
347a8dc3 | 578 | #ifdef CONFIG_S390 |
1da177e4 LT |
579 | #ifdef CONFIG_MATHEMU |
580 | { | |
581 | .ctl_name = KERN_IEEE_EMULATION_WARNINGS, | |
582 | .procname = "ieee_emulation_warnings", | |
583 | .data = &sysctl_ieee_emulation_warnings, | |
584 | .maxlen = sizeof(int), | |
585 | .mode = 0644, | |
586 | .proc_handler = &proc_dointvec, | |
587 | }, | |
1da177e4 LT |
588 | #endif |
589 | { | |
590 | .ctl_name = KERN_S390_USER_DEBUG_LOGGING, | |
591 | .procname = "userprocess_debug", | |
592 | .data = &sysctl_userprocess_debug, | |
593 | .maxlen = sizeof(int), | |
594 | .mode = 0644, | |
595 | .proc_handler = &proc_dointvec, | |
596 | }, | |
597 | #endif | |
598 | { | |
599 | .ctl_name = KERN_PIDMAX, | |
600 | .procname = "pid_max", | |
601 | .data = &pid_max, | |
602 | .maxlen = sizeof (int), | |
603 | .mode = 0644, | |
604 | .proc_handler = &proc_dointvec_minmax, | |
605 | .strategy = sysctl_intvec, | |
606 | .extra1 = &pid_max_min, | |
607 | .extra2 = &pid_max_max, | |
608 | }, | |
609 | { | |
610 | .ctl_name = KERN_PANIC_ON_OOPS, | |
611 | .procname = "panic_on_oops", | |
612 | .data = &panic_on_oops, | |
613 | .maxlen = sizeof(int), | |
614 | .mode = 0644, | |
615 | .proc_handler = &proc_dointvec, | |
616 | }, | |
7ef3d2fd JP |
617 | #if defined CONFIG_PRINTK |
618 | { | |
619 | .ctl_name = KERN_PRINTK, | |
620 | .procname = "printk", | |
621 | .data = &console_loglevel, | |
622 | .maxlen = 4*sizeof(int), | |
623 | .mode = 0644, | |
624 | .proc_handler = &proc_dointvec, | |
625 | }, | |
1da177e4 LT |
626 | { |
627 | .ctl_name = KERN_PRINTK_RATELIMIT, | |
628 | .procname = "printk_ratelimit", | |
717115e1 | 629 | .data = &printk_ratelimit_state.interval, |
1da177e4 LT |
630 | .maxlen = sizeof(int), |
631 | .mode = 0644, | |
632 | .proc_handler = &proc_dointvec_jiffies, | |
633 | .strategy = &sysctl_jiffies, | |
634 | }, | |
635 | { | |
636 | .ctl_name = KERN_PRINTK_RATELIMIT_BURST, | |
637 | .procname = "printk_ratelimit_burst", | |
717115e1 | 638 | .data = &printk_ratelimit_state.burst, |
1da177e4 LT |
639 | .maxlen = sizeof(int), |
640 | .mode = 0644, | |
641 | .proc_handler = &proc_dointvec, | |
642 | }, | |
7ef3d2fd | 643 | #endif |
1da177e4 LT |
644 | { |
645 | .ctl_name = KERN_NGROUPS_MAX, | |
646 | .procname = "ngroups_max", | |
647 | .data = &ngroups_max, | |
648 | .maxlen = sizeof (int), | |
649 | .mode = 0444, | |
650 | .proc_handler = &proc_dointvec, | |
651 | }, | |
652 | #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86) | |
653 | { | |
654 | .ctl_name = KERN_UNKNOWN_NMI_PANIC, | |
655 | .procname = "unknown_nmi_panic", | |
656 | .data = &unknown_nmi_panic, | |
657 | .maxlen = sizeof (int), | |
658 | .mode = 0644, | |
2fbe7b25 | 659 | .proc_handler = &proc_dointvec, |
1da177e4 | 660 | }, |
407984f1 | 661 | { |
407984f1 DZ |
662 | .procname = "nmi_watchdog", |
663 | .data = &nmi_watchdog_enabled, | |
664 | .maxlen = sizeof (int), | |
665 | .mode = 0644, | |
666 | .proc_handler = &proc_nmi_enabled, | |
1da177e4 LT |
667 | }, |
668 | #endif | |
669 | #if defined(CONFIG_X86) | |
8da5adda DZ |
670 | { |
671 | .ctl_name = KERN_PANIC_ON_NMI, | |
672 | .procname = "panic_on_unrecovered_nmi", | |
673 | .data = &panic_on_unrecovered_nmi, | |
674 | .maxlen = sizeof(int), | |
675 | .mode = 0644, | |
676 | .proc_handler = &proc_dointvec, | |
677 | }, | |
1da177e4 LT |
678 | { |
679 | .ctl_name = KERN_BOOTLOADER_TYPE, | |
680 | .procname = "bootloader_type", | |
681 | .data = &bootloader_type, | |
682 | .maxlen = sizeof (int), | |
683 | .mode = 0444, | |
684 | .proc_handler = &proc_dointvec, | |
685 | }, | |
0741f4d2 CE |
686 | { |
687 | .ctl_name = CTL_UNNUMBERED, | |
688 | .procname = "kstack_depth_to_print", | |
689 | .data = &kstack_depth_to_print, | |
690 | .maxlen = sizeof(int), | |
691 | .mode = 0644, | |
692 | .proc_handler = &proc_dointvec, | |
693 | }, | |
6e7c4025 IM |
694 | { |
695 | .ctl_name = CTL_UNNUMBERED, | |
696 | .procname = "io_delay_type", | |
697 | .data = &io_delay_type, | |
698 | .maxlen = sizeof(int), | |
699 | .mode = 0644, | |
700 | .proc_handler = &proc_dointvec, | |
701 | }, | |
1da177e4 | 702 | #endif |
7a9166e3 | 703 | #if defined(CONFIG_MMU) |
1da177e4 LT |
704 | { |
705 | .ctl_name = KERN_RANDOMIZE, | |
706 | .procname = "randomize_va_space", | |
707 | .data = &randomize_va_space, | |
708 | .maxlen = sizeof(int), | |
709 | .mode = 0644, | |
710 | .proc_handler = &proc_dointvec, | |
711 | }, | |
7a9166e3 | 712 | #endif |
0152fb37 | 713 | #if defined(CONFIG_S390) && defined(CONFIG_SMP) |
951f22d5 MS |
714 | { |
715 | .ctl_name = KERN_SPIN_RETRY, | |
716 | .procname = "spin_retry", | |
717 | .data = &spin_retry, | |
718 | .maxlen = sizeof (int), | |
719 | .mode = 0644, | |
720 | .proc_handler = &proc_dointvec, | |
721 | }, | |
c255d844 | 722 | #endif |
673d5b43 | 723 | #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86) |
c255d844 | 724 | { |
c255d844 | 725 | .procname = "acpi_video_flags", |
77afcf78 | 726 | .data = &acpi_realmode_flags, |
c255d844 PM |
727 | .maxlen = sizeof (unsigned long), |
728 | .mode = 0644, | |
7f99f06f | 729 | .proc_handler = &proc_doulongvec_minmax, |
c255d844 | 730 | }, |
d2b176ed JS |
731 | #endif |
732 | #ifdef CONFIG_IA64 | |
733 | { | |
734 | .ctl_name = KERN_IA64_UNALIGNED, | |
735 | .procname = "ignore-unaligned-usertrap", | |
736 | .data = &no_unaligned_warning, | |
737 | .maxlen = sizeof (int), | |
738 | .mode = 0644, | |
739 | .proc_handler = &proc_dointvec, | |
740 | }, | |
bebfa101 | 741 | #endif |
c4f3b63f | 742 | #ifdef CONFIG_DETECT_SOFTLOCKUP |
9c44bc03 IM |
743 | { |
744 | .ctl_name = CTL_UNNUMBERED, | |
745 | .procname = "softlockup_panic", | |
746 | .data = &softlockup_panic, | |
747 | .maxlen = sizeof(int), | |
748 | .mode = 0644, | |
4dca10a9 | 749 | .proc_handler = &proc_dointvec_minmax, |
9c44bc03 IM |
750 | .strategy = &sysctl_intvec, |
751 | .extra1 = &zero, | |
752 | .extra2 = &one, | |
753 | }, | |
c4f3b63f RT |
754 | { |
755 | .ctl_name = CTL_UNNUMBERED, | |
756 | .procname = "softlockup_thresh", | |
757 | .data = &softlockup_thresh, | |
9383d967 | 758 | .maxlen = sizeof(int), |
c4f3b63f | 759 | .mode = 0644, |
9383d967 | 760 | .proc_handler = &proc_dointvec_minmax, |
c4f3b63f | 761 | .strategy = &sysctl_intvec, |
9383d967 | 762 | .extra1 = &neg_one, |
c4f3b63f RT |
763 | .extra2 = &sixty, |
764 | }, | |
82a1fcb9 IM |
765 | { |
766 | .ctl_name = CTL_UNNUMBERED, | |
767 | .procname = "hung_task_check_count", | |
768 | .data = &sysctl_hung_task_check_count, | |
90739081 | 769 | .maxlen = sizeof(unsigned long), |
82a1fcb9 | 770 | .mode = 0644, |
90739081 | 771 | .proc_handler = &proc_doulongvec_minmax, |
82a1fcb9 IM |
772 | .strategy = &sysctl_intvec, |
773 | }, | |
774 | { | |
775 | .ctl_name = CTL_UNNUMBERED, | |
776 | .procname = "hung_task_timeout_secs", | |
777 | .data = &sysctl_hung_task_timeout_secs, | |
90739081 | 778 | .maxlen = sizeof(unsigned long), |
82a1fcb9 | 779 | .mode = 0644, |
90739081 | 780 | .proc_handler = &proc_doulongvec_minmax, |
82a1fcb9 IM |
781 | .strategy = &sysctl_intvec, |
782 | }, | |
783 | { | |
784 | .ctl_name = CTL_UNNUMBERED, | |
785 | .procname = "hung_task_warnings", | |
786 | .data = &sysctl_hung_task_warnings, | |
90739081 | 787 | .maxlen = sizeof(unsigned long), |
82a1fcb9 | 788 | .mode = 0644, |
90739081 | 789 | .proc_handler = &proc_doulongvec_minmax, |
82a1fcb9 IM |
790 | .strategy = &sysctl_intvec, |
791 | }, | |
c4f3b63f | 792 | #endif |
bebfa101 AK |
793 | #ifdef CONFIG_COMPAT |
794 | { | |
795 | .ctl_name = KERN_COMPAT_LOG, | |
796 | .procname = "compat-log", | |
797 | .data = &compat_log, | |
798 | .maxlen = sizeof (int), | |
799 | .mode = 0644, | |
800 | .proc_handler = &proc_dointvec, | |
801 | }, | |
951f22d5 | 802 | #endif |
23f78d4a IM |
803 | #ifdef CONFIG_RT_MUTEXES |
804 | { | |
805 | .ctl_name = KERN_MAX_LOCK_DEPTH, | |
806 | .procname = "max_lock_depth", | |
807 | .data = &max_lock_depth, | |
808 | .maxlen = sizeof(int), | |
809 | .mode = 0644, | |
810 | .proc_handler = &proc_dointvec, | |
811 | }, | |
812 | #endif | |
5096add8 KC |
813 | #ifdef CONFIG_PROC_FS |
814 | { | |
815 | .ctl_name = CTL_UNNUMBERED, | |
816 | .procname = "maps_protect", | |
817 | .data = &maps_protect, | |
818 | .maxlen = sizeof(int), | |
819 | .mode = 0644, | |
820 | .proc_handler = &proc_dointvec, | |
821 | }, | |
822 | #endif | |
10a0a8d4 JF |
823 | { |
824 | .ctl_name = CTL_UNNUMBERED, | |
825 | .procname = "poweroff_cmd", | |
826 | .data = &poweroff_cmd, | |
827 | .maxlen = POWEROFF_CMD_PATH_LEN, | |
828 | .mode = 0644, | |
829 | .proc_handler = &proc_dostring, | |
830 | .strategy = &sysctl_string, | |
831 | }, | |
0b77f5bf DH |
832 | #ifdef CONFIG_KEYS |
833 | { | |
834 | .ctl_name = CTL_UNNUMBERED, | |
835 | .procname = "keys", | |
836 | .mode = 0555, | |
837 | .child = key_sysctls, | |
838 | }, | |
839 | #endif | |
31a72bce PM |
840 | #ifdef CONFIG_RCU_TORTURE_TEST |
841 | { | |
842 | .ctl_name = CTL_UNNUMBERED, | |
843 | .procname = "rcutorture_runnable", | |
844 | .data = &rcutorture_runnable, | |
845 | .maxlen = sizeof(int), | |
846 | .mode = 0644, | |
847 | .proc_handler = &proc_dointvec, | |
848 | }, | |
849 | #endif | |
ed2c12f3 AM |
850 | /* |
851 | * NOTE: do not add new entries to this table unless you have read | |
852 | * Documentation/sysctl/ctl_unnumbered.txt | |
853 | */ | |
1da177e4 LT |
854 | { .ctl_name = 0 } |
855 | }; | |
856 | ||
d8217f07 | 857 | static struct ctl_table vm_table[] = { |
1da177e4 LT |
858 | { |
859 | .ctl_name = VM_OVERCOMMIT_MEMORY, | |
860 | .procname = "overcommit_memory", | |
861 | .data = &sysctl_overcommit_memory, | |
862 | .maxlen = sizeof(sysctl_overcommit_memory), | |
863 | .mode = 0644, | |
864 | .proc_handler = &proc_dointvec, | |
865 | }, | |
fadd8fbd KH |
866 | { |
867 | .ctl_name = VM_PANIC_ON_OOM, | |
868 | .procname = "panic_on_oom", | |
869 | .data = &sysctl_panic_on_oom, | |
870 | .maxlen = sizeof(sysctl_panic_on_oom), | |
871 | .mode = 0644, | |
872 | .proc_handler = &proc_dointvec, | |
873 | }, | |
fe071d7e DR |
874 | { |
875 | .ctl_name = CTL_UNNUMBERED, | |
876 | .procname = "oom_kill_allocating_task", | |
877 | .data = &sysctl_oom_kill_allocating_task, | |
878 | .maxlen = sizeof(sysctl_oom_kill_allocating_task), | |
879 | .mode = 0644, | |
880 | .proc_handler = &proc_dointvec, | |
881 | }, | |
fef1bdd6 DR |
882 | { |
883 | .ctl_name = CTL_UNNUMBERED, | |
884 | .procname = "oom_dump_tasks", | |
885 | .data = &sysctl_oom_dump_tasks, | |
886 | .maxlen = sizeof(sysctl_oom_dump_tasks), | |
887 | .mode = 0644, | |
888 | .proc_handler = &proc_dointvec, | |
889 | }, | |
1da177e4 LT |
890 | { |
891 | .ctl_name = VM_OVERCOMMIT_RATIO, | |
892 | .procname = "overcommit_ratio", | |
893 | .data = &sysctl_overcommit_ratio, | |
894 | .maxlen = sizeof(sysctl_overcommit_ratio), | |
895 | .mode = 0644, | |
896 | .proc_handler = &proc_dointvec, | |
897 | }, | |
898 | { | |
899 | .ctl_name = VM_PAGE_CLUSTER, | |
900 | .procname = "page-cluster", | |
901 | .data = &page_cluster, | |
902 | .maxlen = sizeof(int), | |
903 | .mode = 0644, | |
904 | .proc_handler = &proc_dointvec, | |
905 | }, | |
906 | { | |
907 | .ctl_name = VM_DIRTY_BACKGROUND, | |
908 | .procname = "dirty_background_ratio", | |
909 | .data = &dirty_background_ratio, | |
910 | .maxlen = sizeof(dirty_background_ratio), | |
911 | .mode = 0644, | |
912 | .proc_handler = &proc_dointvec_minmax, | |
913 | .strategy = &sysctl_intvec, | |
914 | .extra1 = &zero, | |
915 | .extra2 = &one_hundred, | |
916 | }, | |
917 | { | |
918 | .ctl_name = VM_DIRTY_RATIO, | |
919 | .procname = "dirty_ratio", | |
920 | .data = &vm_dirty_ratio, | |
921 | .maxlen = sizeof(vm_dirty_ratio), | |
922 | .mode = 0644, | |
04fbfdc1 | 923 | .proc_handler = &dirty_ratio_handler, |
1da177e4 LT |
924 | .strategy = &sysctl_intvec, |
925 | .extra1 = &zero, | |
926 | .extra2 = &one_hundred, | |
927 | }, | |
928 | { | |
1da177e4 | 929 | .procname = "dirty_writeback_centisecs", |
f6ef9438 BS |
930 | .data = &dirty_writeback_interval, |
931 | .maxlen = sizeof(dirty_writeback_interval), | |
1da177e4 LT |
932 | .mode = 0644, |
933 | .proc_handler = &dirty_writeback_centisecs_handler, | |
934 | }, | |
935 | { | |
1da177e4 | 936 | .procname = "dirty_expire_centisecs", |
f6ef9438 BS |
937 | .data = &dirty_expire_interval, |
938 | .maxlen = sizeof(dirty_expire_interval), | |
1da177e4 | 939 | .mode = 0644, |
f6ef9438 | 940 | .proc_handler = &proc_dointvec_userhz_jiffies, |
1da177e4 LT |
941 | }, |
942 | { | |
943 | .ctl_name = VM_NR_PDFLUSH_THREADS, | |
944 | .procname = "nr_pdflush_threads", | |
945 | .data = &nr_pdflush_threads, | |
946 | .maxlen = sizeof nr_pdflush_threads, | |
947 | .mode = 0444 /* read-only*/, | |
948 | .proc_handler = &proc_dointvec, | |
949 | }, | |
950 | { | |
951 | .ctl_name = VM_SWAPPINESS, | |
952 | .procname = "swappiness", | |
953 | .data = &vm_swappiness, | |
954 | .maxlen = sizeof(vm_swappiness), | |
955 | .mode = 0644, | |
956 | .proc_handler = &proc_dointvec_minmax, | |
957 | .strategy = &sysctl_intvec, | |
958 | .extra1 = &zero, | |
959 | .extra2 = &one_hundred, | |
960 | }, | |
961 | #ifdef CONFIG_HUGETLB_PAGE | |
962 | { | |
1da177e4 | 963 | .procname = "nr_hugepages", |
e5ff2159 | 964 | .data = NULL, |
1da177e4 LT |
965 | .maxlen = sizeof(unsigned long), |
966 | .mode = 0644, | |
967 | .proc_handler = &hugetlb_sysctl_handler, | |
968 | .extra1 = (void *)&hugetlb_zero, | |
969 | .extra2 = (void *)&hugetlb_infinity, | |
970 | }, | |
971 | { | |
972 | .ctl_name = VM_HUGETLB_GROUP, | |
973 | .procname = "hugetlb_shm_group", | |
974 | .data = &sysctl_hugetlb_shm_group, | |
975 | .maxlen = sizeof(gid_t), | |
976 | .mode = 0644, | |
977 | .proc_handler = &proc_dointvec, | |
978 | }, | |
396faf03 MG |
979 | { |
980 | .ctl_name = CTL_UNNUMBERED, | |
981 | .procname = "hugepages_treat_as_movable", | |
982 | .data = &hugepages_treat_as_movable, | |
983 | .maxlen = sizeof(int), | |
984 | .mode = 0644, | |
985 | .proc_handler = &hugetlb_treat_movable_handler, | |
986 | }, | |
d1c3fb1f NA |
987 | { |
988 | .ctl_name = CTL_UNNUMBERED, | |
989 | .procname = "nr_overcommit_hugepages", | |
e5ff2159 AK |
990 | .data = NULL, |
991 | .maxlen = sizeof(unsigned long), | |
d1c3fb1f | 992 | .mode = 0644, |
a3d0c6aa | 993 | .proc_handler = &hugetlb_overcommit_handler, |
e5ff2159 AK |
994 | .extra1 = (void *)&hugetlb_zero, |
995 | .extra2 = (void *)&hugetlb_infinity, | |
d1c3fb1f | 996 | }, |
1da177e4 LT |
997 | #endif |
998 | { | |
999 | .ctl_name = VM_LOWMEM_RESERVE_RATIO, | |
1000 | .procname = "lowmem_reserve_ratio", | |
1001 | .data = &sysctl_lowmem_reserve_ratio, | |
1002 | .maxlen = sizeof(sysctl_lowmem_reserve_ratio), | |
1003 | .mode = 0644, | |
1004 | .proc_handler = &lowmem_reserve_ratio_sysctl_handler, | |
1005 | .strategy = &sysctl_intvec, | |
1006 | }, | |
9d0243bc AM |
1007 | { |
1008 | .ctl_name = VM_DROP_PAGECACHE, | |
1009 | .procname = "drop_caches", | |
1010 | .data = &sysctl_drop_caches, | |
1011 | .maxlen = sizeof(int), | |
1012 | .mode = 0644, | |
1013 | .proc_handler = drop_caches_sysctl_handler, | |
1014 | .strategy = &sysctl_intvec, | |
1015 | }, | |
1da177e4 LT |
1016 | { |
1017 | .ctl_name = VM_MIN_FREE_KBYTES, | |
1018 | .procname = "min_free_kbytes", | |
1019 | .data = &min_free_kbytes, | |
1020 | .maxlen = sizeof(min_free_kbytes), | |
1021 | .mode = 0644, | |
1022 | .proc_handler = &min_free_kbytes_sysctl_handler, | |
1023 | .strategy = &sysctl_intvec, | |
1024 | .extra1 = &zero, | |
1025 | }, | |
8ad4b1fb RS |
1026 | { |
1027 | .ctl_name = VM_PERCPU_PAGELIST_FRACTION, | |
1028 | .procname = "percpu_pagelist_fraction", | |
1029 | .data = &percpu_pagelist_fraction, | |
1030 | .maxlen = sizeof(percpu_pagelist_fraction), | |
1031 | .mode = 0644, | |
1032 | .proc_handler = &percpu_pagelist_fraction_sysctl_handler, | |
1033 | .strategy = &sysctl_intvec, | |
1034 | .extra1 = &min_percpu_pagelist_fract, | |
1035 | }, | |
1da177e4 LT |
1036 | #ifdef CONFIG_MMU |
1037 | { | |
1038 | .ctl_name = VM_MAX_MAP_COUNT, | |
1039 | .procname = "max_map_count", | |
1040 | .data = &sysctl_max_map_count, | |
1041 | .maxlen = sizeof(sysctl_max_map_count), | |
1042 | .mode = 0644, | |
1043 | .proc_handler = &proc_dointvec | |
1044 | }, | |
1045 | #endif | |
1046 | { | |
1047 | .ctl_name = VM_LAPTOP_MODE, | |
1048 | .procname = "laptop_mode", | |
1049 | .data = &laptop_mode, | |
1050 | .maxlen = sizeof(laptop_mode), | |
1051 | .mode = 0644, | |
ed5b43f1 BS |
1052 | .proc_handler = &proc_dointvec_jiffies, |
1053 | .strategy = &sysctl_jiffies, | |
1da177e4 LT |
1054 | }, |
1055 | { | |
1056 | .ctl_name = VM_BLOCK_DUMP, | |
1057 | .procname = "block_dump", | |
1058 | .data = &block_dump, | |
1059 | .maxlen = sizeof(block_dump), | |
1060 | .mode = 0644, | |
1061 | .proc_handler = &proc_dointvec, | |
1062 | .strategy = &sysctl_intvec, | |
1063 | .extra1 = &zero, | |
1064 | }, | |
1065 | { | |
1066 | .ctl_name = VM_VFS_CACHE_PRESSURE, | |
1067 | .procname = "vfs_cache_pressure", | |
1068 | .data = &sysctl_vfs_cache_pressure, | |
1069 | .maxlen = sizeof(sysctl_vfs_cache_pressure), | |
1070 | .mode = 0644, | |
1071 | .proc_handler = &proc_dointvec, | |
1072 | .strategy = &sysctl_intvec, | |
1073 | .extra1 = &zero, | |
1074 | }, | |
1075 | #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT | |
1076 | { | |
1077 | .ctl_name = VM_LEGACY_VA_LAYOUT, | |
1078 | .procname = "legacy_va_layout", | |
1079 | .data = &sysctl_legacy_va_layout, | |
1080 | .maxlen = sizeof(sysctl_legacy_va_layout), | |
1081 | .mode = 0644, | |
1082 | .proc_handler = &proc_dointvec, | |
1083 | .strategy = &sysctl_intvec, | |
1084 | .extra1 = &zero, | |
1085 | }, | |
1086 | #endif | |
1743660b CL |
1087 | #ifdef CONFIG_NUMA |
1088 | { | |
1089 | .ctl_name = VM_ZONE_RECLAIM_MODE, | |
1090 | .procname = "zone_reclaim_mode", | |
1091 | .data = &zone_reclaim_mode, | |
1092 | .maxlen = sizeof(zone_reclaim_mode), | |
1093 | .mode = 0644, | |
1094 | .proc_handler = &proc_dointvec, | |
c84db23c CL |
1095 | .strategy = &sysctl_intvec, |
1096 | .extra1 = &zero, | |
1743660b | 1097 | }, |
9614634f CL |
1098 | { |
1099 | .ctl_name = VM_MIN_UNMAPPED, | |
1100 | .procname = "min_unmapped_ratio", | |
1101 | .data = &sysctl_min_unmapped_ratio, | |
1102 | .maxlen = sizeof(sysctl_min_unmapped_ratio), | |
1103 | .mode = 0644, | |
1104 | .proc_handler = &sysctl_min_unmapped_ratio_sysctl_handler, | |
1105 | .strategy = &sysctl_intvec, | |
1106 | .extra1 = &zero, | |
1107 | .extra2 = &one_hundred, | |
1108 | }, | |
0ff38490 CL |
1109 | { |
1110 | .ctl_name = VM_MIN_SLAB, | |
1111 | .procname = "min_slab_ratio", | |
1112 | .data = &sysctl_min_slab_ratio, | |
1113 | .maxlen = sizeof(sysctl_min_slab_ratio), | |
1114 | .mode = 0644, | |
1115 | .proc_handler = &sysctl_min_slab_ratio_sysctl_handler, | |
1116 | .strategy = &sysctl_intvec, | |
1117 | .extra1 = &zero, | |
1118 | .extra2 = &one_hundred, | |
1119 | }, | |
e6e5494c | 1120 | #endif |
77461ab3 CL |
1121 | #ifdef CONFIG_SMP |
1122 | { | |
1123 | .ctl_name = CTL_UNNUMBERED, | |
1124 | .procname = "stat_interval", | |
1125 | .data = &sysctl_stat_interval, | |
1126 | .maxlen = sizeof(sysctl_stat_interval), | |
1127 | .mode = 0644, | |
1128 | .proc_handler = &proc_dointvec_jiffies, | |
1129 | .strategy = &sysctl_jiffies, | |
1130 | }, | |
1131 | #endif | |
ed032189 EP |
1132 | #ifdef CONFIG_SECURITY |
1133 | { | |
1134 | .ctl_name = CTL_UNNUMBERED, | |
1135 | .procname = "mmap_min_addr", | |
1136 | .data = &mmap_min_addr, | |
1137 | .maxlen = sizeof(unsigned long), | |
1138 | .mode = 0644, | |
1139 | .proc_handler = &proc_doulongvec_minmax, | |
1140 | }, | |
8daec965 | 1141 | #endif |
f0c0b2b8 KH |
1142 | #ifdef CONFIG_NUMA |
1143 | { | |
1144 | .ctl_name = CTL_UNNUMBERED, | |
1145 | .procname = "numa_zonelist_order", | |
1146 | .data = &numa_zonelist_order, | |
1147 | .maxlen = NUMA_ZONELIST_ORDER_LEN, | |
1148 | .mode = 0644, | |
1149 | .proc_handler = &numa_zonelist_order_handler, | |
1150 | .strategy = &sysctl_string, | |
1151 | }, | |
1152 | #endif | |
2b8232ce | 1153 | #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \ |
5c36e657 | 1154 | (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL)) |
e6e5494c IM |
1155 | { |
1156 | .ctl_name = VM_VDSO_ENABLED, | |
1157 | .procname = "vdso_enabled", | |
1158 | .data = &vdso_enabled, | |
1159 | .maxlen = sizeof(vdso_enabled), | |
1160 | .mode = 0644, | |
1161 | .proc_handler = &proc_dointvec, | |
1162 | .strategy = &sysctl_intvec, | |
1163 | .extra1 = &zero, | |
1164 | }, | |
1da177e4 | 1165 | #endif |
195cf453 BG |
1166 | #ifdef CONFIG_HIGHMEM |
1167 | { | |
1168 | .ctl_name = CTL_UNNUMBERED, | |
1169 | .procname = "highmem_is_dirtyable", | |
1170 | .data = &vm_highmem_is_dirtyable, | |
1171 | .maxlen = sizeof(vm_highmem_is_dirtyable), | |
1172 | .mode = 0644, | |
1173 | .proc_handler = &proc_dointvec_minmax, | |
1174 | .strategy = &sysctl_intvec, | |
1175 | .extra1 = &zero, | |
1176 | .extra2 = &one, | |
1177 | }, | |
1178 | #endif | |
2be7fe07 AM |
1179 | /* |
1180 | * NOTE: do not add new entries to this table unless you have read | |
1181 | * Documentation/sysctl/ctl_unnumbered.txt | |
1182 | */ | |
1da177e4 LT |
1183 | { .ctl_name = 0 } |
1184 | }; | |
1185 | ||
2abc26fc | 1186 | #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) |
d8217f07 | 1187 | static struct ctl_table binfmt_misc_table[] = { |
2abc26fc EB |
1188 | { .ctl_name = 0 } |
1189 | }; | |
1190 | #endif | |
1191 | ||
d8217f07 | 1192 | static struct ctl_table fs_table[] = { |
1da177e4 LT |
1193 | { |
1194 | .ctl_name = FS_NRINODE, | |
1195 | .procname = "inode-nr", | |
1196 | .data = &inodes_stat, | |
1197 | .maxlen = 2*sizeof(int), | |
1198 | .mode = 0444, | |
1199 | .proc_handler = &proc_dointvec, | |
1200 | }, | |
1201 | { | |
1202 | .ctl_name = FS_STATINODE, | |
1203 | .procname = "inode-state", | |
1204 | .data = &inodes_stat, | |
1205 | .maxlen = 7*sizeof(int), | |
1206 | .mode = 0444, | |
1207 | .proc_handler = &proc_dointvec, | |
1208 | }, | |
1209 | { | |
1da177e4 LT |
1210 | .procname = "file-nr", |
1211 | .data = &files_stat, | |
1212 | .maxlen = 3*sizeof(int), | |
1213 | .mode = 0444, | |
529bf6be | 1214 | .proc_handler = &proc_nr_files, |
1da177e4 LT |
1215 | }, |
1216 | { | |
1217 | .ctl_name = FS_MAXFILE, | |
1218 | .procname = "file-max", | |
1219 | .data = &files_stat.max_files, | |
1220 | .maxlen = sizeof(int), | |
1221 | .mode = 0644, | |
1222 | .proc_handler = &proc_dointvec, | |
1223 | }, | |
9cfe015a ED |
1224 | { |
1225 | .ctl_name = CTL_UNNUMBERED, | |
1226 | .procname = "nr_open", | |
1227 | .data = &sysctl_nr_open, | |
1228 | .maxlen = sizeof(int), | |
1229 | .mode = 0644, | |
eceea0b3 AV |
1230 | .proc_handler = &proc_dointvec_minmax, |
1231 | .extra1 = &sysctl_nr_open_min, | |
1232 | .extra2 = &sysctl_nr_open_max, | |
9cfe015a | 1233 | }, |
1da177e4 LT |
1234 | { |
1235 | .ctl_name = FS_DENTRY, | |
1236 | .procname = "dentry-state", | |
1237 | .data = &dentry_stat, | |
1238 | .maxlen = 6*sizeof(int), | |
1239 | .mode = 0444, | |
1240 | .proc_handler = &proc_dointvec, | |
1241 | }, | |
1242 | { | |
1243 | .ctl_name = FS_OVERFLOWUID, | |
1244 | .procname = "overflowuid", | |
1245 | .data = &fs_overflowuid, | |
1246 | .maxlen = sizeof(int), | |
1247 | .mode = 0644, | |
1248 | .proc_handler = &proc_dointvec_minmax, | |
1249 | .strategy = &sysctl_intvec, | |
1250 | .extra1 = &minolduid, | |
1251 | .extra2 = &maxolduid, | |
1252 | }, | |
1253 | { | |
1254 | .ctl_name = FS_OVERFLOWGID, | |
1255 | .procname = "overflowgid", | |
1256 | .data = &fs_overflowgid, | |
1257 | .maxlen = sizeof(int), | |
1258 | .mode = 0644, | |
1259 | .proc_handler = &proc_dointvec_minmax, | |
1260 | .strategy = &sysctl_intvec, | |
1261 | .extra1 = &minolduid, | |
1262 | .extra2 = &maxolduid, | |
1263 | }, | |
1264 | { | |
1265 | .ctl_name = FS_LEASES, | |
1266 | .procname = "leases-enable", | |
1267 | .data = &leases_enable, | |
1268 | .maxlen = sizeof(int), | |
1269 | .mode = 0644, | |
1270 | .proc_handler = &proc_dointvec, | |
1271 | }, | |
1272 | #ifdef CONFIG_DNOTIFY | |
1273 | { | |
1274 | .ctl_name = FS_DIR_NOTIFY, | |
1275 | .procname = "dir-notify-enable", | |
1276 | .data = &dir_notify_enable, | |
1277 | .maxlen = sizeof(int), | |
1278 | .mode = 0644, | |
1279 | .proc_handler = &proc_dointvec, | |
1280 | }, | |
1281 | #endif | |
1282 | #ifdef CONFIG_MMU | |
1283 | { | |
1284 | .ctl_name = FS_LEASE_TIME, | |
1285 | .procname = "lease-break-time", | |
1286 | .data = &lease_break_time, | |
1287 | .maxlen = sizeof(int), | |
1288 | .mode = 0644, | |
76fdbb25 KH |
1289 | .proc_handler = &proc_dointvec_minmax, |
1290 | .strategy = &sysctl_intvec, | |
1291 | .extra1 = &zero, | |
1292 | .extra2 = &two, | |
1da177e4 LT |
1293 | }, |
1294 | { | |
1da177e4 LT |
1295 | .procname = "aio-nr", |
1296 | .data = &aio_nr, | |
1297 | .maxlen = sizeof(aio_nr), | |
1298 | .mode = 0444, | |
d55b5fda | 1299 | .proc_handler = &proc_doulongvec_minmax, |
1da177e4 LT |
1300 | }, |
1301 | { | |
1da177e4 LT |
1302 | .procname = "aio-max-nr", |
1303 | .data = &aio_max_nr, | |
1304 | .maxlen = sizeof(aio_max_nr), | |
1305 | .mode = 0644, | |
d55b5fda | 1306 | .proc_handler = &proc_doulongvec_minmax, |
1da177e4 | 1307 | }, |
2d9048e2 | 1308 | #ifdef CONFIG_INOTIFY_USER |
0399cb08 RL |
1309 | { |
1310 | .ctl_name = FS_INOTIFY, | |
1311 | .procname = "inotify", | |
1312 | .mode = 0555, | |
1313 | .child = inotify_table, | |
1314 | }, | |
1315 | #endif | |
1da177e4 | 1316 | #endif |
d6e71144 AC |
1317 | { |
1318 | .ctl_name = KERN_SETUID_DUMPABLE, | |
1319 | .procname = "suid_dumpable", | |
1320 | .data = &suid_dumpable, | |
1321 | .maxlen = sizeof(int), | |
1322 | .mode = 0644, | |
1323 | .proc_handler = &proc_dointvec, | |
1324 | }, | |
2abc26fc EB |
1325 | #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) |
1326 | { | |
1327 | .ctl_name = CTL_UNNUMBERED, | |
1328 | .procname = "binfmt_misc", | |
1329 | .mode = 0555, | |
1330 | .child = binfmt_misc_table, | |
1331 | }, | |
1332 | #endif | |
2be7fe07 AM |
1333 | /* |
1334 | * NOTE: do not add new entries to this table unless you have read | |
1335 | * Documentation/sysctl/ctl_unnumbered.txt | |
2be7fe07 | 1336 | */ |
1da177e4 LT |
1337 | { .ctl_name = 0 } |
1338 | }; | |
1339 | ||
d8217f07 | 1340 | static struct ctl_table debug_table[] = { |
d0c3d534 | 1341 | #if defined(CONFIG_X86) || defined(CONFIG_PPC) |
abd4f750 MAS |
1342 | { |
1343 | .ctl_name = CTL_UNNUMBERED, | |
1344 | .procname = "exception-trace", | |
1345 | .data = &show_unhandled_signals, | |
1346 | .maxlen = sizeof(int), | |
1347 | .mode = 0644, | |
1348 | .proc_handler = proc_dointvec | |
1349 | }, | |
1350 | #endif | |
1da177e4 LT |
1351 | { .ctl_name = 0 } |
1352 | }; | |
1353 | ||
d8217f07 | 1354 | static struct ctl_table dev_table[] = { |
1da177e4 | 1355 | { .ctl_name = 0 } |
0eeca283 | 1356 | }; |
1da177e4 | 1357 | |
330d57fb AV |
1358 | static DEFINE_SPINLOCK(sysctl_lock); |
1359 | ||
1360 | /* called under sysctl_lock */ | |
1361 | static int use_table(struct ctl_table_header *p) | |
1362 | { | |
1363 | if (unlikely(p->unregistering)) | |
1364 | return 0; | |
1365 | p->used++; | |
1366 | return 1; | |
1367 | } | |
1368 | ||
1369 | /* called under sysctl_lock */ | |
1370 | static void unuse_table(struct ctl_table_header *p) | |
1371 | { | |
1372 | if (!--p->used) | |
1373 | if (unlikely(p->unregistering)) | |
1374 | complete(p->unregistering); | |
1375 | } | |
1376 | ||
1377 | /* called under sysctl_lock, will reacquire if has to wait */ | |
1378 | static void start_unregistering(struct ctl_table_header *p) | |
1379 | { | |
1380 | /* | |
1381 | * if p->used is 0, nobody will ever touch that entry again; | |
1382 | * we'll eliminate all paths to it before dropping sysctl_lock | |
1383 | */ | |
1384 | if (unlikely(p->used)) { | |
1385 | struct completion wait; | |
1386 | init_completion(&wait); | |
1387 | p->unregistering = &wait; | |
1388 | spin_unlock(&sysctl_lock); | |
1389 | wait_for_completion(&wait); | |
1390 | spin_lock(&sysctl_lock); | |
f7e6ced4 AV |
1391 | } else { |
1392 | /* anything non-NULL; we'll never dereference it */ | |
1393 | p->unregistering = ERR_PTR(-EINVAL); | |
330d57fb AV |
1394 | } |
1395 | /* | |
1396 | * do not remove from the list until nobody holds it; walking the | |
1397 | * list in do_sysctl() relies on that. | |
1398 | */ | |
1399 | list_del_init(&p->ctl_entry); | |
1400 | } | |
1401 | ||
f7e6ced4 AV |
1402 | void sysctl_head_get(struct ctl_table_header *head) |
1403 | { | |
1404 | spin_lock(&sysctl_lock); | |
1405 | head->count++; | |
1406 | spin_unlock(&sysctl_lock); | |
1407 | } | |
1408 | ||
1409 | void sysctl_head_put(struct ctl_table_header *head) | |
1410 | { | |
1411 | spin_lock(&sysctl_lock); | |
1412 | if (!--head->count) | |
1413 | kfree(head); | |
1414 | spin_unlock(&sysctl_lock); | |
1415 | } | |
1416 | ||
1417 | struct ctl_table_header *sysctl_head_grab(struct ctl_table_header *head) | |
1418 | { | |
1419 | if (!head) | |
1420 | BUG(); | |
1421 | spin_lock(&sysctl_lock); | |
1422 | if (!use_table(head)) | |
1423 | head = ERR_PTR(-ENOENT); | |
1424 | spin_unlock(&sysctl_lock); | |
1425 | return head; | |
1426 | } | |
1427 | ||
805b5d5e EB |
1428 | void sysctl_head_finish(struct ctl_table_header *head) |
1429 | { | |
1430 | if (!head) | |
1431 | return; | |
1432 | spin_lock(&sysctl_lock); | |
1433 | unuse_table(head); | |
1434 | spin_unlock(&sysctl_lock); | |
1435 | } | |
1436 | ||
73455092 AV |
1437 | static struct ctl_table_set * |
1438 | lookup_header_set(struct ctl_table_root *root, struct nsproxy *namespaces) | |
1439 | { | |
1440 | struct ctl_table_set *set = &root->default_set; | |
1441 | if (root->lookup) | |
1442 | set = root->lookup(root, namespaces); | |
1443 | return set; | |
1444 | } | |
1445 | ||
e51b6ba0 EB |
1446 | static struct list_head * |
1447 | lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces) | |
805b5d5e | 1448 | { |
73455092 AV |
1449 | struct ctl_table_set *set = lookup_header_set(root, namespaces); |
1450 | return &set->list; | |
e51b6ba0 EB |
1451 | } |
1452 | ||
1453 | struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces, | |
1454 | struct ctl_table_header *prev) | |
1455 | { | |
1456 | struct ctl_table_root *root; | |
1457 | struct list_head *header_list; | |
805b5d5e EB |
1458 | struct ctl_table_header *head; |
1459 | struct list_head *tmp; | |
e51b6ba0 | 1460 | |
805b5d5e EB |
1461 | spin_lock(&sysctl_lock); |
1462 | if (prev) { | |
e51b6ba0 | 1463 | head = prev; |
805b5d5e EB |
1464 | tmp = &prev->ctl_entry; |
1465 | unuse_table(prev); | |
1466 | goto next; | |
1467 | } | |
1468 | tmp = &root_table_header.ctl_entry; | |
1469 | for (;;) { | |
1470 | head = list_entry(tmp, struct ctl_table_header, ctl_entry); | |
1471 | ||
1472 | if (!use_table(head)) | |
1473 | goto next; | |
1474 | spin_unlock(&sysctl_lock); | |
1475 | return head; | |
1476 | next: | |
e51b6ba0 | 1477 | root = head->root; |
805b5d5e | 1478 | tmp = tmp->next; |
e51b6ba0 EB |
1479 | header_list = lookup_header_list(root, namespaces); |
1480 | if (tmp != header_list) | |
1481 | continue; | |
1482 | ||
1483 | do { | |
1484 | root = list_entry(root->root_list.next, | |
1485 | struct ctl_table_root, root_list); | |
1486 | if (root == &sysctl_table_root) | |
1487 | goto out; | |
1488 | header_list = lookup_header_list(root, namespaces); | |
1489 | } while (list_empty(header_list)); | |
1490 | tmp = header_list->next; | |
805b5d5e | 1491 | } |
e51b6ba0 | 1492 | out: |
805b5d5e EB |
1493 | spin_unlock(&sysctl_lock); |
1494 | return NULL; | |
1495 | } | |
1496 | ||
e51b6ba0 EB |
1497 | struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev) |
1498 | { | |
1499 | return __sysctl_head_next(current->nsproxy, prev); | |
1500 | } | |
1501 | ||
1502 | void register_sysctl_root(struct ctl_table_root *root) | |
1503 | { | |
1504 | spin_lock(&sysctl_lock); | |
1505 | list_add_tail(&root->root_list, &sysctl_table_root.root_list); | |
1506 | spin_unlock(&sysctl_lock); | |
1507 | } | |
1508 | ||
b89a8171 | 1509 | #ifdef CONFIG_SYSCTL_SYSCALL |
2c4c7155 | 1510 | /* Perform the actual read/write of a sysctl table entry. */ |
d7321cd6 PE |
1511 | static int do_sysctl_strategy(struct ctl_table_root *root, |
1512 | struct ctl_table *table, | |
2c4c7155 PE |
1513 | int __user *name, int nlen, |
1514 | void __user *oldval, size_t __user *oldlenp, | |
1515 | void __user *newval, size_t newlen) | |
1516 | { | |
1517 | int op = 0, rc; | |
1518 | ||
1519 | if (oldval) | |
e6305c43 | 1520 | op |= MAY_READ; |
2c4c7155 | 1521 | if (newval) |
e6305c43 | 1522 | op |= MAY_WRITE; |
d7321cd6 | 1523 | if (sysctl_perm(root, table, op)) |
2c4c7155 PE |
1524 | return -EPERM; |
1525 | ||
1526 | if (table->strategy) { | |
1527 | rc = table->strategy(table, name, nlen, oldval, oldlenp, | |
1528 | newval, newlen); | |
1529 | if (rc < 0) | |
1530 | return rc; | |
1531 | if (rc > 0) | |
1532 | return 0; | |
1533 | } | |
1534 | ||
1535 | /* If there is no strategy routine, or if the strategy returns | |
1536 | * zero, proceed with automatic r/w */ | |
1537 | if (table->data && table->maxlen) { | |
1538 | rc = sysctl_data(table, name, nlen, oldval, oldlenp, | |
1539 | newval, newlen); | |
1540 | if (rc < 0) | |
1541 | return rc; | |
1542 | } | |
1543 | return 0; | |
1544 | } | |
1545 | ||
1546 | static int parse_table(int __user *name, int nlen, | |
1547 | void __user *oldval, size_t __user *oldlenp, | |
1548 | void __user *newval, size_t newlen, | |
d7321cd6 | 1549 | struct ctl_table_root *root, |
2c4c7155 PE |
1550 | struct ctl_table *table) |
1551 | { | |
1552 | int n; | |
1553 | repeat: | |
1554 | if (!nlen) | |
1555 | return -ENOTDIR; | |
1556 | if (get_user(n, name)) | |
1557 | return -EFAULT; | |
1558 | for ( ; table->ctl_name || table->procname; table++) { | |
1559 | if (!table->ctl_name) | |
1560 | continue; | |
1561 | if (n == table->ctl_name) { | |
1562 | int error; | |
1563 | if (table->child) { | |
e6305c43 | 1564 | if (sysctl_perm(root, table, MAY_EXEC)) |
2c4c7155 PE |
1565 | return -EPERM; |
1566 | name++; | |
1567 | nlen--; | |
1568 | table = table->child; | |
1569 | goto repeat; | |
1570 | } | |
d7321cd6 | 1571 | error = do_sysctl_strategy(root, table, name, nlen, |
2c4c7155 PE |
1572 | oldval, oldlenp, |
1573 | newval, newlen); | |
1574 | return error; | |
1575 | } | |
1576 | } | |
1577 | return -ENOTDIR; | |
1578 | } | |
1579 | ||
1da177e4 LT |
1580 | int do_sysctl(int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp, |
1581 | void __user *newval, size_t newlen) | |
1582 | { | |
805b5d5e | 1583 | struct ctl_table_header *head; |
330d57fb | 1584 | int error = -ENOTDIR; |
1da177e4 LT |
1585 | |
1586 | if (nlen <= 0 || nlen >= CTL_MAXNAME) | |
1587 | return -ENOTDIR; | |
1588 | if (oldval) { | |
1589 | int old_len; | |
1590 | if (!oldlenp || get_user(old_len, oldlenp)) | |
1591 | return -EFAULT; | |
1592 | } | |
330d57fb | 1593 | |
805b5d5e EB |
1594 | for (head = sysctl_head_next(NULL); head; |
1595 | head = sysctl_head_next(head)) { | |
330d57fb | 1596 | error = parse_table(name, nlen, oldval, oldlenp, |
d7321cd6 PE |
1597 | newval, newlen, |
1598 | head->root, head->ctl_table); | |
805b5d5e EB |
1599 | if (error != -ENOTDIR) { |
1600 | sysctl_head_finish(head); | |
330d57fb | 1601 | break; |
805b5d5e EB |
1602 | } |
1603 | } | |
330d57fb | 1604 | return error; |
1da177e4 LT |
1605 | } |
1606 | ||
1607 | asmlinkage long sys_sysctl(struct __sysctl_args __user *args) | |
1608 | { | |
1609 | struct __sysctl_args tmp; | |
1610 | int error; | |
1611 | ||
1612 | if (copy_from_user(&tmp, args, sizeof(tmp))) | |
1613 | return -EFAULT; | |
1614 | ||
7058cb02 EB |
1615 | error = deprecated_sysctl_warning(&tmp); |
1616 | if (error) | |
1617 | goto out; | |
1618 | ||
1da177e4 LT |
1619 | lock_kernel(); |
1620 | error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp, | |
1621 | tmp.newval, tmp.newlen); | |
1622 | unlock_kernel(); | |
7058cb02 | 1623 | out: |
1da177e4 LT |
1624 | return error; |
1625 | } | |
b89a8171 | 1626 | #endif /* CONFIG_SYSCTL_SYSCALL */ |
1da177e4 LT |
1627 | |
1628 | /* | |
1ff007eb | 1629 | * sysctl_perm does NOT grant the superuser all rights automatically, because |
1da177e4 LT |
1630 | * some sysctl variables are readonly even to root. |
1631 | */ | |
1632 | ||
1633 | static int test_perm(int mode, int op) | |
1634 | { | |
1635 | if (!current->euid) | |
1636 | mode >>= 6; | |
1637 | else if (in_egroup_p(0)) | |
1638 | mode >>= 3; | |
e6305c43 | 1639 | if ((op & ~mode & (MAY_READ|MAY_WRITE|MAY_EXEC)) == 0) |
1da177e4 LT |
1640 | return 0; |
1641 | return -EACCES; | |
1642 | } | |
1643 | ||
d7321cd6 | 1644 | int sysctl_perm(struct ctl_table_root *root, struct ctl_table *table, int op) |
1da177e4 LT |
1645 | { |
1646 | int error; | |
d7321cd6 PE |
1647 | int mode; |
1648 | ||
e6305c43 | 1649 | error = security_sysctl(table, op & (MAY_READ | MAY_WRITE | MAY_EXEC)); |
1da177e4 LT |
1650 | if (error) |
1651 | return error; | |
d7321cd6 PE |
1652 | |
1653 | if (root->permissions) | |
1654 | mode = root->permissions(root, current->nsproxy, table); | |
1655 | else | |
1656 | mode = table->mode; | |
1657 | ||
1658 | return test_perm(mode, op); | |
1da177e4 LT |
1659 | } |
1660 | ||
d912b0cc EB |
1661 | static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table) |
1662 | { | |
1663 | for (; table->ctl_name || table->procname; table++) { | |
1664 | table->parent = parent; | |
1665 | if (table->child) | |
1666 | sysctl_set_parent(table, table->child); | |
1667 | } | |
1668 | } | |
1669 | ||
1670 | static __init int sysctl_init(void) | |
1671 | { | |
1672 | sysctl_set_parent(NULL, root_table); | |
88f458e4 HS |
1673 | #ifdef CONFIG_SYSCTL_SYSCALL_CHECK |
1674 | { | |
1675 | int err; | |
1676 | err = sysctl_check_table(current->nsproxy, root_table); | |
1677 | } | |
1678 | #endif | |
d912b0cc EB |
1679 | return 0; |
1680 | } | |
1681 | ||
1682 | core_initcall(sysctl_init); | |
1683 | ||
bfbcf034 AV |
1684 | static struct ctl_table *is_branch_in(struct ctl_table *branch, |
1685 | struct ctl_table *table) | |
ae7edecc AV |
1686 | { |
1687 | struct ctl_table *p; | |
1688 | const char *s = branch->procname; | |
1689 | ||
1690 | /* branch should have named subdirectory as its first element */ | |
1691 | if (!s || !branch->child) | |
bfbcf034 | 1692 | return NULL; |
ae7edecc AV |
1693 | |
1694 | /* ... and nothing else */ | |
1695 | if (branch[1].procname || branch[1].ctl_name) | |
bfbcf034 | 1696 | return NULL; |
ae7edecc AV |
1697 | |
1698 | /* table should contain subdirectory with the same name */ | |
1699 | for (p = table; p->procname || p->ctl_name; p++) { | |
1700 | if (!p->child) | |
1701 | continue; | |
1702 | if (p->procname && strcmp(p->procname, s) == 0) | |
bfbcf034 | 1703 | return p; |
ae7edecc | 1704 | } |
bfbcf034 | 1705 | return NULL; |
ae7edecc AV |
1706 | } |
1707 | ||
1708 | /* see if attaching q to p would be an improvement */ | |
1709 | static void try_attach(struct ctl_table_header *p, struct ctl_table_header *q) | |
1710 | { | |
1711 | struct ctl_table *to = p->ctl_table, *by = q->ctl_table; | |
bfbcf034 | 1712 | struct ctl_table *next; |
ae7edecc AV |
1713 | int is_better = 0; |
1714 | int not_in_parent = !p->attached_by; | |
1715 | ||
bfbcf034 | 1716 | while ((next = is_branch_in(by, to)) != NULL) { |
ae7edecc AV |
1717 | if (by == q->attached_by) |
1718 | is_better = 1; | |
1719 | if (to == p->attached_by) | |
1720 | not_in_parent = 1; | |
1721 | by = by->child; | |
bfbcf034 | 1722 | to = next->child; |
ae7edecc AV |
1723 | } |
1724 | ||
1725 | if (is_better && not_in_parent) { | |
1726 | q->attached_by = by; | |
1727 | q->attached_to = to; | |
1728 | q->parent = p; | |
1729 | } | |
1730 | } | |
1731 | ||
1da177e4 | 1732 | /** |
e51b6ba0 EB |
1733 | * __register_sysctl_paths - register a sysctl hierarchy |
1734 | * @root: List of sysctl headers to register on | |
1735 | * @namespaces: Data to compute which lists of sysctl entries are visible | |
29e796fd | 1736 | * @path: The path to the directory the sysctl table is in. |
1da177e4 | 1737 | * @table: the top-level table structure |
1da177e4 LT |
1738 | * |
1739 | * Register a sysctl table hierarchy. @table should be a filled in ctl_table | |
29e796fd | 1740 | * array. A completely 0 filled entry terminates the table. |
1da177e4 | 1741 | * |
d8217f07 | 1742 | * The members of the &struct ctl_table structure are used as follows: |
1da177e4 LT |
1743 | * |
1744 | * ctl_name - This is the numeric sysctl value used by sysctl(2). The number | |
1745 | * must be unique within that level of sysctl | |
1746 | * | |
1747 | * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not | |
1748 | * enter a sysctl file | |
1749 | * | |
1750 | * data - a pointer to data for use by proc_handler | |
1751 | * | |
1752 | * maxlen - the maximum size in bytes of the data | |
1753 | * | |
1754 | * mode - the file permissions for the /proc/sys file, and for sysctl(2) | |
1755 | * | |
1756 | * child - a pointer to the child sysctl table if this entry is a directory, or | |
1757 | * %NULL. | |
1758 | * | |
1759 | * proc_handler - the text handler routine (described below) | |
1760 | * | |
1761 | * strategy - the strategy routine (described below) | |
1762 | * | |
1763 | * de - for internal use by the sysctl routines | |
1764 | * | |
1765 | * extra1, extra2 - extra pointers usable by the proc handler routines | |
1766 | * | |
1767 | * Leaf nodes in the sysctl tree will be represented by a single file | |
1768 | * under /proc; non-leaf nodes will be represented by directories. | |
1769 | * | |
1770 | * sysctl(2) can automatically manage read and write requests through | |
1771 | * the sysctl table. The data and maxlen fields of the ctl_table | |
1772 | * struct enable minimal validation of the values being written to be | |
1773 | * performed, and the mode field allows minimal authentication. | |
1774 | * | |
1775 | * More sophisticated management can be enabled by the provision of a | |
1776 | * strategy routine with the table entry. This will be called before | |
1777 | * any automatic read or write of the data is performed. | |
1778 | * | |
1779 | * The strategy routine may return | |
1780 | * | |
1781 | * < 0 - Error occurred (error is passed to user process) | |
1782 | * | |
1783 | * 0 - OK - proceed with automatic read or write. | |
1784 | * | |
1785 | * > 0 - OK - read or write has been done by the strategy routine, so | |
1786 | * return immediately. | |
1787 | * | |
1788 | * There must be a proc_handler routine for any terminal nodes | |
1789 | * mirrored under /proc/sys (non-terminals are handled by a built-in | |
1790 | * directory handler). Several default handlers are available to | |
1791 | * cover common cases - | |
1792 | * | |
1793 | * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(), | |
1794 | * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(), | |
1795 | * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax() | |
1796 | * | |
1797 | * It is the handler's job to read the input buffer from user memory | |
1798 | * and process it. The handler should return 0 on success. | |
1799 | * | |
1800 | * This routine returns %NULL on a failure to register, and a pointer | |
1801 | * to the table header on success. | |
1802 | */ | |
e51b6ba0 EB |
1803 | struct ctl_table_header *__register_sysctl_paths( |
1804 | struct ctl_table_root *root, | |
1805 | struct nsproxy *namespaces, | |
1806 | const struct ctl_path *path, struct ctl_table *table) | |
1da177e4 | 1807 | { |
29e796fd EB |
1808 | struct ctl_table_header *header; |
1809 | struct ctl_table *new, **prevp; | |
1810 | unsigned int n, npath; | |
ae7edecc | 1811 | struct ctl_table_set *set; |
29e796fd EB |
1812 | |
1813 | /* Count the path components */ | |
1814 | for (npath = 0; path[npath].ctl_name || path[npath].procname; ++npath) | |
1815 | ; | |
1816 | ||
1817 | /* | |
1818 | * For each path component, allocate a 2-element ctl_table array. | |
1819 | * The first array element will be filled with the sysctl entry | |
1820 | * for this, the second will be the sentinel (ctl_name == 0). | |
1821 | * | |
1822 | * We allocate everything in one go so that we don't have to | |
1823 | * worry about freeing additional memory in unregister_sysctl_table. | |
1824 | */ | |
1825 | header = kzalloc(sizeof(struct ctl_table_header) + | |
1826 | (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL); | |
1827 | if (!header) | |
1da177e4 | 1828 | return NULL; |
29e796fd EB |
1829 | |
1830 | new = (struct ctl_table *) (header + 1); | |
1831 | ||
1832 | /* Now connect the dots */ | |
1833 | prevp = &header->ctl_table; | |
1834 | for (n = 0; n < npath; ++n, ++path) { | |
1835 | /* Copy the procname */ | |
1836 | new->procname = path->procname; | |
1837 | new->ctl_name = path->ctl_name; | |
1838 | new->mode = 0555; | |
1839 | ||
1840 | *prevp = new; | |
1841 | prevp = &new->child; | |
1842 | ||
1843 | new += 2; | |
1844 | } | |
1845 | *prevp = table; | |
23eb06de | 1846 | header->ctl_table_arg = table; |
29e796fd EB |
1847 | |
1848 | INIT_LIST_HEAD(&header->ctl_entry); | |
1849 | header->used = 0; | |
1850 | header->unregistering = NULL; | |
e51b6ba0 | 1851 | header->root = root; |
29e796fd | 1852 | sysctl_set_parent(NULL, header->ctl_table); |
f7e6ced4 | 1853 | header->count = 1; |
88f458e4 | 1854 | #ifdef CONFIG_SYSCTL_SYSCALL_CHECK |
e51b6ba0 | 1855 | if (sysctl_check_table(namespaces, header->ctl_table)) { |
29e796fd | 1856 | kfree(header); |
fc6cd25b EB |
1857 | return NULL; |
1858 | } | |
88f458e4 | 1859 | #endif |
330d57fb | 1860 | spin_lock(&sysctl_lock); |
73455092 | 1861 | header->set = lookup_header_set(root, namespaces); |
ae7edecc AV |
1862 | header->attached_by = header->ctl_table; |
1863 | header->attached_to = root_table; | |
1864 | header->parent = &root_table_header; | |
1865 | for (set = header->set; set; set = set->parent) { | |
1866 | struct ctl_table_header *p; | |
1867 | list_for_each_entry(p, &set->list, ctl_entry) { | |
1868 | if (p->unregistering) | |
1869 | continue; | |
1870 | try_attach(p, header); | |
1871 | } | |
1872 | } | |
1873 | header->parent->count++; | |
73455092 | 1874 | list_add_tail(&header->ctl_entry, &header->set->list); |
330d57fb | 1875 | spin_unlock(&sysctl_lock); |
29e796fd EB |
1876 | |
1877 | return header; | |
1878 | } | |
1879 | ||
e51b6ba0 EB |
1880 | /** |
1881 | * register_sysctl_table_path - register a sysctl table hierarchy | |
1882 | * @path: The path to the directory the sysctl table is in. | |
1883 | * @table: the top-level table structure | |
1884 | * | |
1885 | * Register a sysctl table hierarchy. @table should be a filled in ctl_table | |
1886 | * array. A completely 0 filled entry terminates the table. | |
1887 | * | |
1888 | * See __register_sysctl_paths for more details. | |
1889 | */ | |
1890 | struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path, | |
1891 | struct ctl_table *table) | |
1892 | { | |
1893 | return __register_sysctl_paths(&sysctl_table_root, current->nsproxy, | |
1894 | path, table); | |
1895 | } | |
1896 | ||
29e796fd EB |
1897 | /** |
1898 | * register_sysctl_table - register a sysctl table hierarchy | |
1899 | * @table: the top-level table structure | |
1900 | * | |
1901 | * Register a sysctl table hierarchy. @table should be a filled in ctl_table | |
1902 | * array. A completely 0 filled entry terminates the table. | |
1903 | * | |
1904 | * See register_sysctl_paths for more details. | |
1905 | */ | |
1906 | struct ctl_table_header *register_sysctl_table(struct ctl_table *table) | |
1907 | { | |
1908 | static const struct ctl_path null_path[] = { {} }; | |
1909 | ||
1910 | return register_sysctl_paths(null_path, table); | |
1da177e4 LT |
1911 | } |
1912 | ||
1913 | /** | |
1914 | * unregister_sysctl_table - unregister a sysctl table hierarchy | |
1915 | * @header: the header returned from register_sysctl_table | |
1916 | * | |
1917 | * Unregisters the sysctl table and all children. proc entries may not | |
1918 | * actually be removed until they are no longer used by anyone. | |
1919 | */ | |
1920 | void unregister_sysctl_table(struct ctl_table_header * header) | |
1921 | { | |
330d57fb | 1922 | might_sleep(); |
f1dad166 PE |
1923 | |
1924 | if (header == NULL) | |
1925 | return; | |
1926 | ||
330d57fb AV |
1927 | spin_lock(&sysctl_lock); |
1928 | start_unregistering(header); | |
ae7edecc AV |
1929 | if (!--header->parent->count) { |
1930 | WARN_ON(1); | |
1931 | kfree(header->parent); | |
1932 | } | |
f7e6ced4 AV |
1933 | if (!--header->count) |
1934 | kfree(header); | |
330d57fb | 1935 | spin_unlock(&sysctl_lock); |
1da177e4 LT |
1936 | } |
1937 | ||
9043476f AV |
1938 | int sysctl_is_seen(struct ctl_table_header *p) |
1939 | { | |
1940 | struct ctl_table_set *set = p->set; | |
1941 | int res; | |
1942 | spin_lock(&sysctl_lock); | |
1943 | if (p->unregistering) | |
1944 | res = 0; | |
1945 | else if (!set->is_seen) | |
1946 | res = 1; | |
1947 | else | |
1948 | res = set->is_seen(set); | |
1949 | spin_unlock(&sysctl_lock); | |
1950 | return res; | |
1951 | } | |
1952 | ||
73455092 AV |
1953 | void setup_sysctl_set(struct ctl_table_set *p, |
1954 | struct ctl_table_set *parent, | |
1955 | int (*is_seen)(struct ctl_table_set *)) | |
1956 | { | |
1957 | INIT_LIST_HEAD(&p->list); | |
1958 | p->parent = parent ? parent : &sysctl_table_root.default_set; | |
1959 | p->is_seen = is_seen; | |
1960 | } | |
1961 | ||
b89a8171 | 1962 | #else /* !CONFIG_SYSCTL */ |
d8217f07 | 1963 | struct ctl_table_header *register_sysctl_table(struct ctl_table * table) |
b89a8171 EB |
1964 | { |
1965 | return NULL; | |
1966 | } | |
1967 | ||
29e796fd EB |
1968 | struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path, |
1969 | struct ctl_table *table) | |
1970 | { | |
1971 | return NULL; | |
1972 | } | |
1973 | ||
b89a8171 EB |
1974 | void unregister_sysctl_table(struct ctl_table_header * table) |
1975 | { | |
1976 | } | |
1977 | ||
73455092 AV |
1978 | void setup_sysctl_set(struct ctl_table_set *p, |
1979 | struct ctl_table_set *parent, | |
1980 | int (*is_seen)(struct ctl_table_set *)) | |
1981 | { | |
1982 | } | |
1983 | ||
f7e6ced4 AV |
1984 | void sysctl_head_put(struct ctl_table_header *head) |
1985 | { | |
1986 | } | |
1987 | ||
b89a8171 EB |
1988 | #endif /* CONFIG_SYSCTL */ |
1989 | ||
1da177e4 LT |
1990 | /* |
1991 | * /proc/sys support | |
1992 | */ | |
1993 | ||
b89a8171 | 1994 | #ifdef CONFIG_PROC_SYSCTL |
1da177e4 | 1995 | |
b1ba4ddd AB |
1996 | static int _proc_do_string(void* data, int maxlen, int write, |
1997 | struct file *filp, void __user *buffer, | |
1998 | size_t *lenp, loff_t *ppos) | |
1da177e4 LT |
1999 | { |
2000 | size_t len; | |
2001 | char __user *p; | |
2002 | char c; | |
8d060877 ON |
2003 | |
2004 | if (!data || !maxlen || !*lenp) { | |
1da177e4 LT |
2005 | *lenp = 0; |
2006 | return 0; | |
2007 | } | |
8d060877 | 2008 | |
1da177e4 LT |
2009 | if (write) { |
2010 | len = 0; | |
2011 | p = buffer; | |
2012 | while (len < *lenp) { | |
2013 | if (get_user(c, p++)) | |
2014 | return -EFAULT; | |
2015 | if (c == 0 || c == '\n') | |
2016 | break; | |
2017 | len++; | |
2018 | } | |
f5dd3d6f SV |
2019 | if (len >= maxlen) |
2020 | len = maxlen-1; | |
2021 | if(copy_from_user(data, buffer, len)) | |
1da177e4 | 2022 | return -EFAULT; |
f5dd3d6f | 2023 | ((char *) data)[len] = 0; |
1da177e4 LT |
2024 | *ppos += *lenp; |
2025 | } else { | |
f5dd3d6f SV |
2026 | len = strlen(data); |
2027 | if (len > maxlen) | |
2028 | len = maxlen; | |
8d060877 ON |
2029 | |
2030 | if (*ppos > len) { | |
2031 | *lenp = 0; | |
2032 | return 0; | |
2033 | } | |
2034 | ||
2035 | data += *ppos; | |
2036 | len -= *ppos; | |
2037 | ||
1da177e4 LT |
2038 | if (len > *lenp) |
2039 | len = *lenp; | |
2040 | if (len) | |
f5dd3d6f | 2041 | if(copy_to_user(buffer, data, len)) |
1da177e4 LT |
2042 | return -EFAULT; |
2043 | if (len < *lenp) { | |
2044 | if(put_user('\n', ((char __user *) buffer) + len)) | |
2045 | return -EFAULT; | |
2046 | len++; | |
2047 | } | |
2048 | *lenp = len; | |
2049 | *ppos += len; | |
2050 | } | |
2051 | return 0; | |
2052 | } | |
2053 | ||
f5dd3d6f SV |
2054 | /** |
2055 | * proc_dostring - read a string sysctl | |
2056 | * @table: the sysctl table | |
2057 | * @write: %TRUE if this is a write to the sysctl file | |
2058 | * @filp: the file structure | |
2059 | * @buffer: the user buffer | |
2060 | * @lenp: the size of the user buffer | |
2061 | * @ppos: file position | |
2062 | * | |
2063 | * Reads/writes a string from/to the user buffer. If the kernel | |
2064 | * buffer provided is not large enough to hold the string, the | |
2065 | * string is truncated. The copied string is %NULL-terminated. | |
2066 | * If the string is being read by the user process, it is copied | |
2067 | * and a newline '\n' is added. It is truncated if the buffer is | |
2068 | * not large enough. | |
2069 | * | |
2070 | * Returns 0 on success. | |
2071 | */ | |
d8217f07 | 2072 | int proc_dostring(struct ctl_table *table, int write, struct file *filp, |
f5dd3d6f SV |
2073 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2074 | { | |
2075 | return _proc_do_string(table->data, table->maxlen, write, filp, | |
2076 | buffer, lenp, ppos); | |
2077 | } | |
2078 | ||
1da177e4 LT |
2079 | |
2080 | static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp, | |
2081 | int *valp, | |
2082 | int write, void *data) | |
2083 | { | |
2084 | if (write) { | |
2085 | *valp = *negp ? -*lvalp : *lvalp; | |
2086 | } else { | |
2087 | int val = *valp; | |
2088 | if (val < 0) { | |
2089 | *negp = -1; | |
2090 | *lvalp = (unsigned long)-val; | |
2091 | } else { | |
2092 | *negp = 0; | |
2093 | *lvalp = (unsigned long)val; | |
2094 | } | |
2095 | } | |
2096 | return 0; | |
2097 | } | |
2098 | ||
d8217f07 | 2099 | static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table, |
fcfbd547 KK |
2100 | int write, struct file *filp, void __user *buffer, |
2101 | size_t *lenp, loff_t *ppos, | |
1da177e4 LT |
2102 | int (*conv)(int *negp, unsigned long *lvalp, int *valp, |
2103 | int write, void *data), | |
2104 | void *data) | |
2105 | { | |
2106 | #define TMPBUFLEN 21 | |
2107 | int *i, vleft, first=1, neg, val; | |
2108 | unsigned long lval; | |
2109 | size_t left, len; | |
2110 | ||
2111 | char buf[TMPBUFLEN], *p; | |
2112 | char __user *s = buffer; | |
2113 | ||
fcfbd547 | 2114 | if (!tbl_data || !table->maxlen || !*lenp || |
1da177e4 LT |
2115 | (*ppos && !write)) { |
2116 | *lenp = 0; | |
2117 | return 0; | |
2118 | } | |
2119 | ||
fcfbd547 | 2120 | i = (int *) tbl_data; |
1da177e4 LT |
2121 | vleft = table->maxlen / sizeof(*i); |
2122 | left = *lenp; | |
2123 | ||
2124 | if (!conv) | |
2125 | conv = do_proc_dointvec_conv; | |
2126 | ||
2127 | for (; left && vleft--; i++, first=0) { | |
2128 | if (write) { | |
2129 | while (left) { | |
2130 | char c; | |
2131 | if (get_user(c, s)) | |
2132 | return -EFAULT; | |
2133 | if (!isspace(c)) | |
2134 | break; | |
2135 | left--; | |
2136 | s++; | |
2137 | } | |
2138 | if (!left) | |
2139 | break; | |
2140 | neg = 0; | |
2141 | len = left; | |
2142 | if (len > sizeof(buf) - 1) | |
2143 | len = sizeof(buf) - 1; | |
2144 | if (copy_from_user(buf, s, len)) | |
2145 | return -EFAULT; | |
2146 | buf[len] = 0; | |
2147 | p = buf; | |
2148 | if (*p == '-' && left > 1) { | |
2149 | neg = 1; | |
bd9b0bac | 2150 | p++; |
1da177e4 LT |
2151 | } |
2152 | if (*p < '0' || *p > '9') | |
2153 | break; | |
2154 | ||
2155 | lval = simple_strtoul(p, &p, 0); | |
2156 | ||
2157 | len = p-buf; | |
2158 | if ((len < left) && *p && !isspace(*p)) | |
2159 | break; | |
2160 | if (neg) | |
2161 | val = -val; | |
2162 | s += len; | |
2163 | left -= len; | |
2164 | ||
2165 | if (conv(&neg, &lval, i, 1, data)) | |
2166 | break; | |
2167 | } else { | |
2168 | p = buf; | |
2169 | if (!first) | |
2170 | *p++ = '\t'; | |
2171 | ||
2172 | if (conv(&neg, &lval, i, 0, data)) | |
2173 | break; | |
2174 | ||
2175 | sprintf(p, "%s%lu", neg ? "-" : "", lval); | |
2176 | len = strlen(buf); | |
2177 | if (len > left) | |
2178 | len = left; | |
2179 | if(copy_to_user(s, buf, len)) | |
2180 | return -EFAULT; | |
2181 | left -= len; | |
2182 | s += len; | |
2183 | } | |
2184 | } | |
2185 | ||
2186 | if (!write && !first && left) { | |
2187 | if(put_user('\n', s)) | |
2188 | return -EFAULT; | |
2189 | left--, s++; | |
2190 | } | |
2191 | if (write) { | |
2192 | while (left) { | |
2193 | char c; | |
2194 | if (get_user(c, s++)) | |
2195 | return -EFAULT; | |
2196 | if (!isspace(c)) | |
2197 | break; | |
2198 | left--; | |
2199 | } | |
2200 | } | |
2201 | if (write && first) | |
2202 | return -EINVAL; | |
2203 | *lenp -= left; | |
2204 | *ppos += *lenp; | |
2205 | return 0; | |
2206 | #undef TMPBUFLEN | |
2207 | } | |
2208 | ||
d8217f07 | 2209 | static int do_proc_dointvec(struct ctl_table *table, int write, struct file *filp, |
fcfbd547 KK |
2210 | void __user *buffer, size_t *lenp, loff_t *ppos, |
2211 | int (*conv)(int *negp, unsigned long *lvalp, int *valp, | |
2212 | int write, void *data), | |
2213 | void *data) | |
2214 | { | |
2215 | return __do_proc_dointvec(table->data, table, write, filp, | |
2216 | buffer, lenp, ppos, conv, data); | |
2217 | } | |
2218 | ||
1da177e4 LT |
2219 | /** |
2220 | * proc_dointvec - read a vector of integers | |
2221 | * @table: the sysctl table | |
2222 | * @write: %TRUE if this is a write to the sysctl file | |
2223 | * @filp: the file structure | |
2224 | * @buffer: the user buffer | |
2225 | * @lenp: the size of the user buffer | |
2226 | * @ppos: file position | |
2227 | * | |
2228 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer | |
2229 | * values from/to the user buffer, treated as an ASCII string. | |
2230 | * | |
2231 | * Returns 0 on success. | |
2232 | */ | |
d8217f07 | 2233 | int proc_dointvec(struct ctl_table *table, int write, struct file *filp, |
1da177e4 LT |
2234 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2235 | { | |
2236 | return do_proc_dointvec(table,write,filp,buffer,lenp,ppos, | |
2237 | NULL,NULL); | |
2238 | } | |
2239 | ||
2240 | #define OP_SET 0 | |
2241 | #define OP_AND 1 | |
34f5a398 | 2242 | #define OP_OR 2 |
1da177e4 LT |
2243 | |
2244 | static int do_proc_dointvec_bset_conv(int *negp, unsigned long *lvalp, | |
2245 | int *valp, | |
2246 | int write, void *data) | |
2247 | { | |
2248 | int op = *(int *)data; | |
2249 | if (write) { | |
2250 | int val = *negp ? -*lvalp : *lvalp; | |
2251 | switch(op) { | |
2252 | case OP_SET: *valp = val; break; | |
2253 | case OP_AND: *valp &= val; break; | |
34f5a398 | 2254 | case OP_OR: *valp |= val; break; |
1da177e4 LT |
2255 | } |
2256 | } else { | |
2257 | int val = *valp; | |
2258 | if (val < 0) { | |
2259 | *negp = -1; | |
2260 | *lvalp = (unsigned long)-val; | |
2261 | } else { | |
2262 | *negp = 0; | |
2263 | *lvalp = (unsigned long)val; | |
2264 | } | |
2265 | } | |
2266 | return 0; | |
2267 | } | |
2268 | ||
34f5a398 TT |
2269 | /* |
2270 | * Taint values can only be increased | |
2271 | */ | |
d8217f07 | 2272 | static int proc_dointvec_taint(struct ctl_table *table, int write, struct file *filp, |
34f5a398 TT |
2273 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2274 | { | |
2275 | int op; | |
2276 | ||
91fcd412 | 2277 | if (write && !capable(CAP_SYS_ADMIN)) |
34f5a398 TT |
2278 | return -EPERM; |
2279 | ||
2280 | op = OP_OR; | |
2281 | return do_proc_dointvec(table,write,filp,buffer,lenp,ppos, | |
2282 | do_proc_dointvec_bset_conv,&op); | |
2283 | } | |
2284 | ||
1da177e4 LT |
2285 | struct do_proc_dointvec_minmax_conv_param { |
2286 | int *min; | |
2287 | int *max; | |
2288 | }; | |
2289 | ||
2290 | static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp, | |
2291 | int *valp, | |
2292 | int write, void *data) | |
2293 | { | |
2294 | struct do_proc_dointvec_minmax_conv_param *param = data; | |
2295 | if (write) { | |
2296 | int val = *negp ? -*lvalp : *lvalp; | |
2297 | if ((param->min && *param->min > val) || | |
2298 | (param->max && *param->max < val)) | |
2299 | return -EINVAL; | |
2300 | *valp = val; | |
2301 | } else { | |
2302 | int val = *valp; | |
2303 | if (val < 0) { | |
2304 | *negp = -1; | |
2305 | *lvalp = (unsigned long)-val; | |
2306 | } else { | |
2307 | *negp = 0; | |
2308 | *lvalp = (unsigned long)val; | |
2309 | } | |
2310 | } | |
2311 | return 0; | |
2312 | } | |
2313 | ||
2314 | /** | |
2315 | * proc_dointvec_minmax - read a vector of integers with min/max values | |
2316 | * @table: the sysctl table | |
2317 | * @write: %TRUE if this is a write to the sysctl file | |
2318 | * @filp: the file structure | |
2319 | * @buffer: the user buffer | |
2320 | * @lenp: the size of the user buffer | |
2321 | * @ppos: file position | |
2322 | * | |
2323 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer | |
2324 | * values from/to the user buffer, treated as an ASCII string. | |
2325 | * | |
2326 | * This routine will ensure the values are within the range specified by | |
2327 | * table->extra1 (min) and table->extra2 (max). | |
2328 | * | |
2329 | * Returns 0 on success. | |
2330 | */ | |
d8217f07 | 2331 | int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp, |
1da177e4 LT |
2332 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2333 | { | |
2334 | struct do_proc_dointvec_minmax_conv_param param = { | |
2335 | .min = (int *) table->extra1, | |
2336 | .max = (int *) table->extra2, | |
2337 | }; | |
2338 | return do_proc_dointvec(table, write, filp, buffer, lenp, ppos, | |
2339 | do_proc_dointvec_minmax_conv, ¶m); | |
2340 | } | |
2341 | ||
d8217f07 | 2342 | static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write, |
1da177e4 LT |
2343 | struct file *filp, |
2344 | void __user *buffer, | |
2345 | size_t *lenp, loff_t *ppos, | |
2346 | unsigned long convmul, | |
2347 | unsigned long convdiv) | |
2348 | { | |
2349 | #define TMPBUFLEN 21 | |
2350 | unsigned long *i, *min, *max, val; | |
2351 | int vleft, first=1, neg; | |
2352 | size_t len, left; | |
2353 | char buf[TMPBUFLEN], *p; | |
2354 | char __user *s = buffer; | |
2355 | ||
fcfbd547 | 2356 | if (!data || !table->maxlen || !*lenp || |
1da177e4 LT |
2357 | (*ppos && !write)) { |
2358 | *lenp = 0; | |
2359 | return 0; | |
2360 | } | |
2361 | ||
fcfbd547 | 2362 | i = (unsigned long *) data; |
1da177e4 LT |
2363 | min = (unsigned long *) table->extra1; |
2364 | max = (unsigned long *) table->extra2; | |
2365 | vleft = table->maxlen / sizeof(unsigned long); | |
2366 | left = *lenp; | |
2367 | ||
2368 | for (; left && vleft--; i++, min++, max++, first=0) { | |
2369 | if (write) { | |
2370 | while (left) { | |
2371 | char c; | |
2372 | if (get_user(c, s)) | |
2373 | return -EFAULT; | |
2374 | if (!isspace(c)) | |
2375 | break; | |
2376 | left--; | |
2377 | s++; | |
2378 | } | |
2379 | if (!left) | |
2380 | break; | |
2381 | neg = 0; | |
2382 | len = left; | |
2383 | if (len > TMPBUFLEN-1) | |
2384 | len = TMPBUFLEN-1; | |
2385 | if (copy_from_user(buf, s, len)) | |
2386 | return -EFAULT; | |
2387 | buf[len] = 0; | |
2388 | p = buf; | |
2389 | if (*p == '-' && left > 1) { | |
2390 | neg = 1; | |
bd9b0bac | 2391 | p++; |
1da177e4 LT |
2392 | } |
2393 | if (*p < '0' || *p > '9') | |
2394 | break; | |
2395 | val = simple_strtoul(p, &p, 0) * convmul / convdiv ; | |
2396 | len = p-buf; | |
2397 | if ((len < left) && *p && !isspace(*p)) | |
2398 | break; | |
2399 | if (neg) | |
2400 | val = -val; | |
2401 | s += len; | |
2402 | left -= len; | |
2403 | ||
2404 | if(neg) | |
2405 | continue; | |
2406 | if ((min && val < *min) || (max && val > *max)) | |
2407 | continue; | |
2408 | *i = val; | |
2409 | } else { | |
2410 | p = buf; | |
2411 | if (!first) | |
2412 | *p++ = '\t'; | |
2413 | sprintf(p, "%lu", convdiv * (*i) / convmul); | |
2414 | len = strlen(buf); | |
2415 | if (len > left) | |
2416 | len = left; | |
2417 | if(copy_to_user(s, buf, len)) | |
2418 | return -EFAULT; | |
2419 | left -= len; | |
2420 | s += len; | |
2421 | } | |
2422 | } | |
2423 | ||
2424 | if (!write && !first && left) { | |
2425 | if(put_user('\n', s)) | |
2426 | return -EFAULT; | |
2427 | left--, s++; | |
2428 | } | |
2429 | if (write) { | |
2430 | while (left) { | |
2431 | char c; | |
2432 | if (get_user(c, s++)) | |
2433 | return -EFAULT; | |
2434 | if (!isspace(c)) | |
2435 | break; | |
2436 | left--; | |
2437 | } | |
2438 | } | |
2439 | if (write && first) | |
2440 | return -EINVAL; | |
2441 | *lenp -= left; | |
2442 | *ppos += *lenp; | |
2443 | return 0; | |
2444 | #undef TMPBUFLEN | |
2445 | } | |
2446 | ||
d8217f07 | 2447 | static int do_proc_doulongvec_minmax(struct ctl_table *table, int write, |
fcfbd547 KK |
2448 | struct file *filp, |
2449 | void __user *buffer, | |
2450 | size_t *lenp, loff_t *ppos, | |
2451 | unsigned long convmul, | |
2452 | unsigned long convdiv) | |
2453 | { | |
2454 | return __do_proc_doulongvec_minmax(table->data, table, write, | |
2455 | filp, buffer, lenp, ppos, convmul, convdiv); | |
2456 | } | |
2457 | ||
1da177e4 LT |
2458 | /** |
2459 | * proc_doulongvec_minmax - read a vector of long integers with min/max values | |
2460 | * @table: the sysctl table | |
2461 | * @write: %TRUE if this is a write to the sysctl file | |
2462 | * @filp: the file structure | |
2463 | * @buffer: the user buffer | |
2464 | * @lenp: the size of the user buffer | |
2465 | * @ppos: file position | |
2466 | * | |
2467 | * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long | |
2468 | * values from/to the user buffer, treated as an ASCII string. | |
2469 | * | |
2470 | * This routine will ensure the values are within the range specified by | |
2471 | * table->extra1 (min) and table->extra2 (max). | |
2472 | * | |
2473 | * Returns 0 on success. | |
2474 | */ | |
d8217f07 | 2475 | int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp, |
1da177e4 LT |
2476 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2477 | { | |
2478 | return do_proc_doulongvec_minmax(table, write, filp, buffer, lenp, ppos, 1l, 1l); | |
2479 | } | |
2480 | ||
2481 | /** | |
2482 | * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values | |
2483 | * @table: the sysctl table | |
2484 | * @write: %TRUE if this is a write to the sysctl file | |
2485 | * @filp: the file structure | |
2486 | * @buffer: the user buffer | |
2487 | * @lenp: the size of the user buffer | |
2488 | * @ppos: file position | |
2489 | * | |
2490 | * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long | |
2491 | * values from/to the user buffer, treated as an ASCII string. The values | |
2492 | * are treated as milliseconds, and converted to jiffies when they are stored. | |
2493 | * | |
2494 | * This routine will ensure the values are within the range specified by | |
2495 | * table->extra1 (min) and table->extra2 (max). | |
2496 | * | |
2497 | * Returns 0 on success. | |
2498 | */ | |
d8217f07 | 2499 | int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, |
1da177e4 LT |
2500 | struct file *filp, |
2501 | void __user *buffer, | |
2502 | size_t *lenp, loff_t *ppos) | |
2503 | { | |
2504 | return do_proc_doulongvec_minmax(table, write, filp, buffer, | |
2505 | lenp, ppos, HZ, 1000l); | |
2506 | } | |
2507 | ||
2508 | ||
2509 | static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp, | |
2510 | int *valp, | |
2511 | int write, void *data) | |
2512 | { | |
2513 | if (write) { | |
cba9f33d BS |
2514 | if (*lvalp > LONG_MAX / HZ) |
2515 | return 1; | |
1da177e4 LT |
2516 | *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ); |
2517 | } else { | |
2518 | int val = *valp; | |
2519 | unsigned long lval; | |
2520 | if (val < 0) { | |
2521 | *negp = -1; | |
2522 | lval = (unsigned long)-val; | |
2523 | } else { | |
2524 | *negp = 0; | |
2525 | lval = (unsigned long)val; | |
2526 | } | |
2527 | *lvalp = lval / HZ; | |
2528 | } | |
2529 | return 0; | |
2530 | } | |
2531 | ||
2532 | static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp, | |
2533 | int *valp, | |
2534 | int write, void *data) | |
2535 | { | |
2536 | if (write) { | |
cba9f33d BS |
2537 | if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ) |
2538 | return 1; | |
1da177e4 LT |
2539 | *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp); |
2540 | } else { | |
2541 | int val = *valp; | |
2542 | unsigned long lval; | |
2543 | if (val < 0) { | |
2544 | *negp = -1; | |
2545 | lval = (unsigned long)-val; | |
2546 | } else { | |
2547 | *negp = 0; | |
2548 | lval = (unsigned long)val; | |
2549 | } | |
2550 | *lvalp = jiffies_to_clock_t(lval); | |
2551 | } | |
2552 | return 0; | |
2553 | } | |
2554 | ||
2555 | static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp, | |
2556 | int *valp, | |
2557 | int write, void *data) | |
2558 | { | |
2559 | if (write) { | |
2560 | *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp); | |
2561 | } else { | |
2562 | int val = *valp; | |
2563 | unsigned long lval; | |
2564 | if (val < 0) { | |
2565 | *negp = -1; | |
2566 | lval = (unsigned long)-val; | |
2567 | } else { | |
2568 | *negp = 0; | |
2569 | lval = (unsigned long)val; | |
2570 | } | |
2571 | *lvalp = jiffies_to_msecs(lval); | |
2572 | } | |
2573 | return 0; | |
2574 | } | |
2575 | ||
2576 | /** | |
2577 | * proc_dointvec_jiffies - read a vector of integers as seconds | |
2578 | * @table: the sysctl table | |
2579 | * @write: %TRUE if this is a write to the sysctl file | |
2580 | * @filp: the file structure | |
2581 | * @buffer: the user buffer | |
2582 | * @lenp: the size of the user buffer | |
2583 | * @ppos: file position | |
2584 | * | |
2585 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer | |
2586 | * values from/to the user buffer, treated as an ASCII string. | |
2587 | * The values read are assumed to be in seconds, and are converted into | |
2588 | * jiffies. | |
2589 | * | |
2590 | * Returns 0 on success. | |
2591 | */ | |
d8217f07 | 2592 | int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp, |
1da177e4 LT |
2593 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2594 | { | |
2595 | return do_proc_dointvec(table,write,filp,buffer,lenp,ppos, | |
2596 | do_proc_dointvec_jiffies_conv,NULL); | |
2597 | } | |
2598 | ||
2599 | /** | |
2600 | * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds | |
2601 | * @table: the sysctl table | |
2602 | * @write: %TRUE if this is a write to the sysctl file | |
2603 | * @filp: the file structure | |
2604 | * @buffer: the user buffer | |
2605 | * @lenp: the size of the user buffer | |
1e5d5331 | 2606 | * @ppos: pointer to the file position |
1da177e4 LT |
2607 | * |
2608 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer | |
2609 | * values from/to the user buffer, treated as an ASCII string. | |
2610 | * The values read are assumed to be in 1/USER_HZ seconds, and | |
2611 | * are converted into jiffies. | |
2612 | * | |
2613 | * Returns 0 on success. | |
2614 | */ | |
d8217f07 | 2615 | int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp, |
1da177e4 LT |
2616 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2617 | { | |
2618 | return do_proc_dointvec(table,write,filp,buffer,lenp,ppos, | |
2619 | do_proc_dointvec_userhz_jiffies_conv,NULL); | |
2620 | } | |
2621 | ||
2622 | /** | |
2623 | * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds | |
2624 | * @table: the sysctl table | |
2625 | * @write: %TRUE if this is a write to the sysctl file | |
2626 | * @filp: the file structure | |
2627 | * @buffer: the user buffer | |
2628 | * @lenp: the size of the user buffer | |
67be2dd1 MW |
2629 | * @ppos: file position |
2630 | * @ppos: the current position in the file | |
1da177e4 LT |
2631 | * |
2632 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer | |
2633 | * values from/to the user buffer, treated as an ASCII string. | |
2634 | * The values read are assumed to be in 1/1000 seconds, and | |
2635 | * are converted into jiffies. | |
2636 | * | |
2637 | * Returns 0 on success. | |
2638 | */ | |
d8217f07 | 2639 | int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp, |
1da177e4 LT |
2640 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2641 | { | |
2642 | return do_proc_dointvec(table, write, filp, buffer, lenp, ppos, | |
2643 | do_proc_dointvec_ms_jiffies_conv, NULL); | |
2644 | } | |
2645 | ||
d8217f07 | 2646 | static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp, |
9ec52099 CLG |
2647 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2648 | { | |
2649 | struct pid *new_pid; | |
2650 | pid_t tmp; | |
2651 | int r; | |
2652 | ||
6c5f3e7b | 2653 | tmp = pid_vnr(cad_pid); |
9ec52099 CLG |
2654 | |
2655 | r = __do_proc_dointvec(&tmp, table, write, filp, buffer, | |
2656 | lenp, ppos, NULL, NULL); | |
2657 | if (r || !write) | |
2658 | return r; | |
2659 | ||
2660 | new_pid = find_get_pid(tmp); | |
2661 | if (!new_pid) | |
2662 | return -ESRCH; | |
2663 | ||
2664 | put_pid(xchg(&cad_pid, new_pid)); | |
2665 | return 0; | |
2666 | } | |
2667 | ||
1da177e4 LT |
2668 | #else /* CONFIG_PROC_FS */ |
2669 | ||
d8217f07 | 2670 | int proc_dostring(struct ctl_table *table, int write, struct file *filp, |
1da177e4 LT |
2671 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2672 | { | |
2673 | return -ENOSYS; | |
2674 | } | |
2675 | ||
d8217f07 | 2676 | int proc_dointvec(struct ctl_table *table, int write, struct file *filp, |
1da177e4 | 2677 | void __user *buffer, size_t *lenp, loff_t *ppos) |
1da177e4 LT |
2678 | { |
2679 | return -ENOSYS; | |
2680 | } | |
2681 | ||
d8217f07 | 2682 | int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp, |
1da177e4 LT |
2683 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2684 | { | |
2685 | return -ENOSYS; | |
2686 | } | |
2687 | ||
d8217f07 | 2688 | int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp, |
1da177e4 LT |
2689 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2690 | { | |
2691 | return -ENOSYS; | |
2692 | } | |
2693 | ||
d8217f07 | 2694 | int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp, |
1da177e4 LT |
2695 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2696 | { | |
2697 | return -ENOSYS; | |
2698 | } | |
2699 | ||
d8217f07 | 2700 | int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp, |
1da177e4 LT |
2701 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2702 | { | |
2703 | return -ENOSYS; | |
2704 | } | |
2705 | ||
d8217f07 | 2706 | int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp, |
1da177e4 LT |
2707 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2708 | { | |
2709 | return -ENOSYS; | |
2710 | } | |
2711 | ||
d8217f07 | 2712 | int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, |
1da177e4 LT |
2713 | struct file *filp, |
2714 | void __user *buffer, | |
2715 | size_t *lenp, loff_t *ppos) | |
2716 | { | |
2717 | return -ENOSYS; | |
2718 | } | |
2719 | ||
2720 | ||
2721 | #endif /* CONFIG_PROC_FS */ | |
2722 | ||
2723 | ||
b89a8171 | 2724 | #ifdef CONFIG_SYSCTL_SYSCALL |
1da177e4 LT |
2725 | /* |
2726 | * General sysctl support routines | |
2727 | */ | |
2728 | ||
49a0c458 EB |
2729 | /* The generic sysctl data routine (used if no strategy routine supplied) */ |
2730 | int sysctl_data(struct ctl_table *table, int __user *name, int nlen, | |
2731 | void __user *oldval, size_t __user *oldlenp, | |
2732 | void __user *newval, size_t newlen) | |
2733 | { | |
2734 | size_t len; | |
2735 | ||
2736 | /* Get out of I don't have a variable */ | |
2737 | if (!table->data || !table->maxlen) | |
2738 | return -ENOTDIR; | |
2739 | ||
2740 | if (oldval && oldlenp) { | |
2741 | if (get_user(len, oldlenp)) | |
2742 | return -EFAULT; | |
2743 | if (len) { | |
2744 | if (len > table->maxlen) | |
2745 | len = table->maxlen; | |
2746 | if (copy_to_user(oldval, table->data, len)) | |
2747 | return -EFAULT; | |
2748 | if (put_user(len, oldlenp)) | |
2749 | return -EFAULT; | |
2750 | } | |
2751 | } | |
2752 | ||
2753 | if (newval && newlen) { | |
2754 | if (newlen > table->maxlen) | |
2755 | newlen = table->maxlen; | |
2756 | ||
2757 | if (copy_from_user(table->data, newval, newlen)) | |
2758 | return -EFAULT; | |
2759 | } | |
2760 | return 1; | |
2761 | } | |
2762 | ||
1da177e4 | 2763 | /* The generic string strategy routine: */ |
d8217f07 | 2764 | int sysctl_string(struct ctl_table *table, int __user *name, int nlen, |
1da177e4 | 2765 | void __user *oldval, size_t __user *oldlenp, |
1f29bcd7 | 2766 | void __user *newval, size_t newlen) |
1da177e4 | 2767 | { |
1da177e4 LT |
2768 | if (!table->data || !table->maxlen) |
2769 | return -ENOTDIR; | |
2770 | ||
2771 | if (oldval && oldlenp) { | |
de9e007d LT |
2772 | size_t bufsize; |
2773 | if (get_user(bufsize, oldlenp)) | |
1da177e4 | 2774 | return -EFAULT; |
de9e007d LT |
2775 | if (bufsize) { |
2776 | size_t len = strlen(table->data), copied; | |
2777 | ||
2778 | /* This shouldn't trigger for a well-formed sysctl */ | |
2779 | if (len > table->maxlen) | |
1da177e4 | 2780 | len = table->maxlen; |
de9e007d LT |
2781 | |
2782 | /* Copy up to a max of bufsize-1 bytes of the string */ | |
2783 | copied = (len >= bufsize) ? bufsize - 1 : len; | |
2784 | ||
2785 | if (copy_to_user(oldval, table->data, copied) || | |
2786 | put_user(0, (char __user *)(oldval + copied))) | |
1da177e4 | 2787 | return -EFAULT; |
de9e007d | 2788 | if (put_user(len, oldlenp)) |
1da177e4 LT |
2789 | return -EFAULT; |
2790 | } | |
2791 | } | |
2792 | if (newval && newlen) { | |
de9e007d | 2793 | size_t len = newlen; |
1da177e4 LT |
2794 | if (len > table->maxlen) |
2795 | len = table->maxlen; | |
2796 | if(copy_from_user(table->data, newval, len)) | |
2797 | return -EFAULT; | |
2798 | if (len == table->maxlen) | |
2799 | len--; | |
2800 | ((char *) table->data)[len] = 0; | |
2801 | } | |
82c9df82 | 2802 | return 1; |
1da177e4 LT |
2803 | } |
2804 | ||
2805 | /* | |
2806 | * This function makes sure that all of the integers in the vector | |
2807 | * are between the minimum and maximum values given in the arrays | |
2808 | * table->extra1 and table->extra2, respectively. | |
2809 | */ | |
d8217f07 | 2810 | int sysctl_intvec(struct ctl_table *table, int __user *name, int nlen, |
1da177e4 | 2811 | void __user *oldval, size_t __user *oldlenp, |
1f29bcd7 | 2812 | void __user *newval, size_t newlen) |
1da177e4 LT |
2813 | { |
2814 | ||
2815 | if (newval && newlen) { | |
2816 | int __user *vec = (int __user *) newval; | |
2817 | int *min = (int *) table->extra1; | |
2818 | int *max = (int *) table->extra2; | |
2819 | size_t length; | |
2820 | int i; | |
2821 | ||
2822 | if (newlen % sizeof(int) != 0) | |
2823 | return -EINVAL; | |
2824 | ||
2825 | if (!table->extra1 && !table->extra2) | |
2826 | return 0; | |
2827 | ||
2828 | if (newlen > table->maxlen) | |
2829 | newlen = table->maxlen; | |
2830 | length = newlen / sizeof(int); | |
2831 | ||
2832 | for (i = 0; i < length; i++) { | |
2833 | int value; | |
2834 | if (get_user(value, vec + i)) | |
2835 | return -EFAULT; | |
2836 | if (min && value < min[i]) | |
2837 | return -EINVAL; | |
2838 | if (max && value > max[i]) | |
2839 | return -EINVAL; | |
2840 | } | |
2841 | } | |
2842 | return 0; | |
2843 | } | |
2844 | ||
2845 | /* Strategy function to convert jiffies to seconds */ | |
d8217f07 | 2846 | int sysctl_jiffies(struct ctl_table *table, int __user *name, int nlen, |
1da177e4 | 2847 | void __user *oldval, size_t __user *oldlenp, |
1f29bcd7 | 2848 | void __user *newval, size_t newlen) |
1da177e4 | 2849 | { |
3ee75ac3 | 2850 | if (oldval && oldlenp) { |
1da177e4 | 2851 | size_t olen; |
3ee75ac3 AD |
2852 | |
2853 | if (get_user(olen, oldlenp)) | |
2854 | return -EFAULT; | |
2855 | if (olen) { | |
2856 | int val; | |
2857 | ||
2858 | if (olen < sizeof(int)) | |
2859 | return -EINVAL; | |
2860 | ||
2861 | val = *(int *)(table->data) / HZ; | |
2862 | if (put_user(val, (int __user *)oldval)) | |
2863 | return -EFAULT; | |
2864 | if (put_user(sizeof(int), oldlenp)) | |
1da177e4 | 2865 | return -EFAULT; |
1da177e4 | 2866 | } |
1da177e4 LT |
2867 | } |
2868 | if (newval && newlen) { | |
2869 | int new; | |
2870 | if (newlen != sizeof(int)) | |
2871 | return -EINVAL; | |
2872 | if (get_user(new, (int __user *)newval)) | |
2873 | return -EFAULT; | |
2874 | *(int *)(table->data) = new*HZ; | |
2875 | } | |
2876 | return 1; | |
2877 | } | |
2878 | ||
2879 | /* Strategy function to convert jiffies to seconds */ | |
d8217f07 | 2880 | int sysctl_ms_jiffies(struct ctl_table *table, int __user *name, int nlen, |
1da177e4 | 2881 | void __user *oldval, size_t __user *oldlenp, |
1f29bcd7 | 2882 | void __user *newval, size_t newlen) |
1da177e4 | 2883 | { |
3ee75ac3 | 2884 | if (oldval && oldlenp) { |
1da177e4 | 2885 | size_t olen; |
3ee75ac3 AD |
2886 | |
2887 | if (get_user(olen, oldlenp)) | |
2888 | return -EFAULT; | |
2889 | if (olen) { | |
2890 | int val; | |
2891 | ||
2892 | if (olen < sizeof(int)) | |
2893 | return -EINVAL; | |
2894 | ||
2895 | val = jiffies_to_msecs(*(int *)(table->data)); | |
2896 | if (put_user(val, (int __user *)oldval)) | |
2897 | return -EFAULT; | |
2898 | if (put_user(sizeof(int), oldlenp)) | |
1da177e4 | 2899 | return -EFAULT; |
1da177e4 | 2900 | } |
1da177e4 LT |
2901 | } |
2902 | if (newval && newlen) { | |
2903 | int new; | |
2904 | if (newlen != sizeof(int)) | |
2905 | return -EINVAL; | |
2906 | if (get_user(new, (int __user *)newval)) | |
2907 | return -EFAULT; | |
2908 | *(int *)(table->data) = msecs_to_jiffies(new); | |
2909 | } | |
2910 | return 1; | |
2911 | } | |
2912 | ||
c4b8b769 | 2913 | |
c4b8b769 | 2914 | |
b89a8171 | 2915 | #else /* CONFIG_SYSCTL_SYSCALL */ |
1da177e4 LT |
2916 | |
2917 | ||
2918 | asmlinkage long sys_sysctl(struct __sysctl_args __user *args) | |
2919 | { | |
0e009be8 | 2920 | struct __sysctl_args tmp; |
7058cb02 | 2921 | int error; |
0e009be8 | 2922 | |
0e009be8 EB |
2923 | if (copy_from_user(&tmp, args, sizeof(tmp))) |
2924 | return -EFAULT; | |
0e009be8 | 2925 | |
7058cb02 | 2926 | error = deprecated_sysctl_warning(&tmp); |
b89a8171 | 2927 | |
7058cb02 EB |
2928 | /* If no error reading the parameters then just -ENOSYS ... */ |
2929 | if (!error) | |
2930 | error = -ENOSYS; | |
2931 | ||
2932 | return error; | |
1da177e4 LT |
2933 | } |
2934 | ||
49a0c458 EB |
2935 | int sysctl_data(struct ctl_table *table, int __user *name, int nlen, |
2936 | void __user *oldval, size_t __user *oldlenp, | |
2937 | void __user *newval, size_t newlen) | |
2938 | { | |
2939 | return -ENOSYS; | |
2940 | } | |
2941 | ||
d8217f07 | 2942 | int sysctl_string(struct ctl_table *table, int __user *name, int nlen, |
1da177e4 | 2943 | void __user *oldval, size_t __user *oldlenp, |
1f29bcd7 | 2944 | void __user *newval, size_t newlen) |
1da177e4 LT |
2945 | { |
2946 | return -ENOSYS; | |
2947 | } | |
2948 | ||
d8217f07 | 2949 | int sysctl_intvec(struct ctl_table *table, int __user *name, int nlen, |
1da177e4 | 2950 | void __user *oldval, size_t __user *oldlenp, |
1f29bcd7 | 2951 | void __user *newval, size_t newlen) |
1da177e4 LT |
2952 | { |
2953 | return -ENOSYS; | |
2954 | } | |
2955 | ||
d8217f07 | 2956 | int sysctl_jiffies(struct ctl_table *table, int __user *name, int nlen, |
1da177e4 | 2957 | void __user *oldval, size_t __user *oldlenp, |
1f29bcd7 | 2958 | void __user *newval, size_t newlen) |
1da177e4 LT |
2959 | { |
2960 | return -ENOSYS; | |
2961 | } | |
2962 | ||
d8217f07 | 2963 | int sysctl_ms_jiffies(struct ctl_table *table, int __user *name, int nlen, |
1da177e4 | 2964 | void __user *oldval, size_t __user *oldlenp, |
1f29bcd7 | 2965 | void __user *newval, size_t newlen) |
1da177e4 LT |
2966 | { |
2967 | return -ENOSYS; | |
2968 | } | |
2969 | ||
b89a8171 | 2970 | #endif /* CONFIG_SYSCTL_SYSCALL */ |
1da177e4 | 2971 | |
7058cb02 EB |
2972 | static int deprecated_sysctl_warning(struct __sysctl_args *args) |
2973 | { | |
2974 | static int msg_count; | |
2975 | int name[CTL_MAXNAME]; | |
2976 | int i; | |
2977 | ||
6fc48af8 TH |
2978 | /* Check args->nlen. */ |
2979 | if (args->nlen < 0 || args->nlen > CTL_MAXNAME) | |
2980 | return -ENOTDIR; | |
2981 | ||
7058cb02 EB |
2982 | /* Read in the sysctl name for better debug message logging */ |
2983 | for (i = 0; i < args->nlen; i++) | |
2984 | if (get_user(name[i], args->name + i)) | |
2985 | return -EFAULT; | |
2986 | ||
2987 | /* Ignore accesses to kernel.version */ | |
2988 | if ((args->nlen == 2) && (name[0] == CTL_KERN) && (name[1] == KERN_VERSION)) | |
2989 | return 0; | |
2990 | ||
2991 | if (msg_count < 5) { | |
2992 | msg_count++; | |
2993 | printk(KERN_INFO | |
2994 | "warning: process `%s' used the deprecated sysctl " | |
2995 | "system call with ", current->comm); | |
2996 | for (i = 0; i < args->nlen; i++) | |
2997 | printk("%d.", name[i]); | |
2998 | printk("\n"); | |
2999 | } | |
3000 | return 0; | |
3001 | } | |
3002 | ||
1da177e4 LT |
3003 | /* |
3004 | * No sense putting this after each symbol definition, twice, | |
3005 | * exception granted :-) | |
3006 | */ | |
3007 | EXPORT_SYMBOL(proc_dointvec); | |
3008 | EXPORT_SYMBOL(proc_dointvec_jiffies); | |
3009 | EXPORT_SYMBOL(proc_dointvec_minmax); | |
3010 | EXPORT_SYMBOL(proc_dointvec_userhz_jiffies); | |
3011 | EXPORT_SYMBOL(proc_dointvec_ms_jiffies); | |
3012 | EXPORT_SYMBOL(proc_dostring); | |
3013 | EXPORT_SYMBOL(proc_doulongvec_minmax); | |
3014 | EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax); | |
3015 | EXPORT_SYMBOL(register_sysctl_table); | |
29e796fd | 3016 | EXPORT_SYMBOL(register_sysctl_paths); |
1da177e4 LT |
3017 | EXPORT_SYMBOL(sysctl_intvec); |
3018 | EXPORT_SYMBOL(sysctl_jiffies); | |
3019 | EXPORT_SYMBOL(sysctl_ms_jiffies); | |
3020 | EXPORT_SYMBOL(sysctl_string); | |
49a0c458 | 3021 | EXPORT_SYMBOL(sysctl_data); |
1da177e4 | 3022 | EXPORT_SYMBOL(unregister_sysctl_table); |