Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * sysctl.c: General linux system control interface | |
3 | * | |
4 | * Begun 24 March 1995, Stephen Tweedie | |
5 | * Added /proc support, Dec 1995 | |
6 | * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas. | |
7 | * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver. | |
8 | * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver. | |
9 | * Dynamic registration fixes, Stephen Tweedie. | |
10 | * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn. | |
11 | * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris | |
12 | * Horn. | |
13 | * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer. | |
14 | * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer. | |
15 | * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill | |
16 | * Wendling. | |
17 | * The list_for_each() macro wasn't appropriate for the sysctl loop. | |
18 | * Removed it and replaced it with older style, 03/23/00, Bill Wendling | |
19 | */ | |
20 | ||
1da177e4 LT |
21 | #include <linux/module.h> |
22 | #include <linux/mm.h> | |
23 | #include <linux/swap.h> | |
24 | #include <linux/slab.h> | |
25 | #include <linux/sysctl.h> | |
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> | |
40 | #include <linux/security.h> | |
41 | #include <linux/initrd.h> | |
42 | #include <linux/times.h> | |
43 | #include <linux/limits.h> | |
44 | #include <linux/dcache.h> | |
45 | #include <linux/syscalls.h> | |
c255d844 PM |
46 | #include <linux/nfs_fs.h> |
47 | #include <linux/acpi.h> | |
10a0a8d4 | 48 | #include <linux/reboot.h> |
1da177e4 LT |
49 | |
50 | #include <asm/uaccess.h> | |
51 | #include <asm/processor.h> | |
52 | ||
29cbc78b AK |
53 | #ifdef CONFIG_X86 |
54 | #include <asm/nmi.h> | |
0741f4d2 | 55 | #include <asm/stacktrace.h> |
29cbc78b AK |
56 | #endif |
57 | ||
7058cb02 EB |
58 | static int deprecated_sysctl_warning(struct __sysctl_args *args); |
59 | ||
1da177e4 LT |
60 | #if defined(CONFIG_SYSCTL) |
61 | ||
62 | /* External variables not in a header file. */ | |
63 | extern int C_A_D; | |
45807a1d | 64 | extern int print_fatal_signals; |
1da177e4 LT |
65 | extern int sysctl_overcommit_memory; |
66 | extern int sysctl_overcommit_ratio; | |
fadd8fbd | 67 | extern int sysctl_panic_on_oom; |
fe071d7e | 68 | extern int sysctl_oom_kill_allocating_task; |
1da177e4 | 69 | extern int max_threads; |
1da177e4 | 70 | extern int core_uses_pid; |
d6e71144 | 71 | extern int suid_dumpable; |
1da177e4 | 72 | extern char core_pattern[]; |
1da177e4 LT |
73 | extern int pid_max; |
74 | extern int min_free_kbytes; | |
75 | extern int printk_ratelimit_jiffies; | |
76 | extern int printk_ratelimit_burst; | |
77 | extern int pid_max_min, pid_max_max; | |
9d0243bc | 78 | extern int sysctl_drop_caches; |
8ad4b1fb | 79 | extern int percpu_pagelist_fraction; |
bebfa101 | 80 | extern int compat_log; |
5096add8 | 81 | extern int maps_protect; |
77461ab3 | 82 | extern int sysctl_stat_interval; |
bdf4c48a | 83 | extern int audit_argv_kb; |
1da177e4 | 84 | |
c4f3b63f RT |
85 | /* Constants used for minimum and maximum */ |
86 | #ifdef CONFIG_DETECT_SOFTLOCKUP | |
87 | static int one = 1; | |
88 | static int sixty = 60; | |
89 | #endif | |
90 | ||
91 | #ifdef CONFIG_MMU | |
92 | static int two = 2; | |
93 | #endif | |
94 | ||
95 | static int zero; | |
96 | static int one_hundred = 100; | |
97 | ||
1da177e4 LT |
98 | /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */ |
99 | static int maxolduid = 65535; | |
100 | static int minolduid; | |
8ad4b1fb | 101 | static int min_percpu_pagelist_fract = 8; |
1da177e4 LT |
102 | |
103 | static int ngroups_max = NGROUPS_MAX; | |
104 | ||
105 | #ifdef CONFIG_KMOD | |
106 | extern char modprobe_path[]; | |
107 | #endif | |
1da177e4 LT |
108 | #ifdef CONFIG_CHR_DEV_SG |
109 | extern int sg_big_buff; | |
110 | #endif | |
1da177e4 LT |
111 | |
112 | #ifdef __sparc__ | |
113 | extern char reboot_command []; | |
114 | extern int stop_a_enabled; | |
115 | extern int scons_pwroff; | |
116 | #endif | |
117 | ||
118 | #ifdef __hppa__ | |
119 | extern int pwrsw_enabled; | |
120 | extern int unaligned_enabled; | |
121 | #endif | |
122 | ||
347a8dc3 | 123 | #ifdef CONFIG_S390 |
1da177e4 LT |
124 | #ifdef CONFIG_MATHEMU |
125 | extern int sysctl_ieee_emulation_warnings; | |
126 | #endif | |
127 | extern int sysctl_userprocess_debug; | |
951f22d5 | 128 | extern int spin_retry; |
1da177e4 LT |
129 | #endif |
130 | ||
131 | extern int sysctl_hz_timer; | |
132 | ||
133 | #ifdef CONFIG_BSD_PROCESS_ACCT | |
134 | extern int acct_parm[]; | |
135 | #endif | |
136 | ||
d2b176ed JS |
137 | #ifdef CONFIG_IA64 |
138 | extern int no_unaligned_warning; | |
139 | #endif | |
140 | ||
23f78d4a IM |
141 | #ifdef CONFIG_RT_MUTEXES |
142 | extern int max_lock_depth; | |
143 | #endif | |
144 | ||
b89a8171 EB |
145 | #ifdef CONFIG_SYSCTL_SYSCALL |
146 | static int parse_table(int __user *, int, void __user *, size_t __user *, | |
d8217f07 | 147 | void __user *, size_t, struct ctl_table *); |
b89a8171 EB |
148 | #endif |
149 | ||
6b49a257 | 150 | |
d6f8ff73 | 151 | #ifdef CONFIG_PROC_SYSCTL |
d8217f07 | 152 | static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp, |
9ec52099 | 153 | void __user *buffer, size_t *lenp, loff_t *ppos); |
d8217f07 | 154 | static int proc_dointvec_taint(struct ctl_table *table, int write, struct file *filp, |
34f5a398 | 155 | void __user *buffer, size_t *lenp, loff_t *ppos); |
d6f8ff73 | 156 | #endif |
9ec52099 | 157 | |
d8217f07 | 158 | static struct ctl_table root_table[]; |
1da177e4 LT |
159 | static struct ctl_table_header root_table_header = |
160 | { root_table, LIST_HEAD_INIT(root_table_header.ctl_entry) }; | |
161 | ||
d8217f07 EB |
162 | static struct ctl_table kern_table[]; |
163 | static struct ctl_table vm_table[]; | |
164 | static struct ctl_table fs_table[]; | |
165 | static struct ctl_table debug_table[]; | |
166 | static struct ctl_table dev_table[]; | |
167 | extern struct ctl_table random_table[]; | |
2d9048e2 | 168 | #ifdef CONFIG_INOTIFY_USER |
d8217f07 | 169 | extern struct ctl_table inotify_table[]; |
0399cb08 | 170 | #endif |
1da177e4 LT |
171 | |
172 | #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT | |
173 | int sysctl_legacy_va_layout; | |
174 | #endif | |
175 | ||
f20786ff PZ |
176 | extern int prove_locking; |
177 | extern int lock_stat; | |
9bc9a6bd | 178 | |
1da177e4 LT |
179 | /* The default sysctl tables: */ |
180 | ||
d8217f07 | 181 | static struct ctl_table root_table[] = { |
1da177e4 LT |
182 | { |
183 | .ctl_name = CTL_KERN, | |
184 | .procname = "kernel", | |
185 | .mode = 0555, | |
186 | .child = kern_table, | |
187 | }, | |
188 | { | |
189 | .ctl_name = CTL_VM, | |
190 | .procname = "vm", | |
191 | .mode = 0555, | |
192 | .child = vm_table, | |
193 | }, | |
194 | #ifdef CONFIG_NET | |
195 | { | |
196 | .ctl_name = CTL_NET, | |
197 | .procname = "net", | |
198 | .mode = 0555, | |
199 | .child = net_table, | |
200 | }, | |
201 | #endif | |
1da177e4 LT |
202 | { |
203 | .ctl_name = CTL_FS, | |
204 | .procname = "fs", | |
205 | .mode = 0555, | |
206 | .child = fs_table, | |
207 | }, | |
208 | { | |
209 | .ctl_name = CTL_DEBUG, | |
210 | .procname = "debug", | |
211 | .mode = 0555, | |
212 | .child = debug_table, | |
213 | }, | |
214 | { | |
215 | .ctl_name = CTL_DEV, | |
216 | .procname = "dev", | |
217 | .mode = 0555, | |
218 | .child = dev_table, | |
219 | }, | |
2be7fe07 AM |
220 | /* |
221 | * NOTE: do not add new entries to this table unless you have read | |
222 | * Documentation/sysctl/ctl_unnumbered.txt | |
223 | */ | |
1da177e4 LT |
224 | { .ctl_name = 0 } |
225 | }; | |
226 | ||
77e54a1f IM |
227 | #ifdef CONFIG_SCHED_DEBUG |
228 | static unsigned long min_sched_granularity_ns = 100000; /* 100 usecs */ | |
229 | static unsigned long max_sched_granularity_ns = 1000000000; /* 1 second */ | |
230 | static unsigned long min_wakeup_granularity_ns; /* 0 usecs */ | |
231 | static unsigned long max_wakeup_granularity_ns = 1000000000; /* 1 second */ | |
232 | #endif | |
233 | ||
d8217f07 | 234 | static struct ctl_table kern_table[] = { |
77e54a1f IM |
235 | #ifdef CONFIG_SCHED_DEBUG |
236 | { | |
237 | .ctl_name = CTL_UNNUMBERED, | |
b2be5e96 PZ |
238 | .procname = "sched_min_granularity_ns", |
239 | .data = &sysctl_sched_min_granularity, | |
77e54a1f IM |
240 | .maxlen = sizeof(unsigned int), |
241 | .mode = 0644, | |
b2be5e96 PZ |
242 | .proc_handler = &sched_nr_latency_handler, |
243 | .strategy = &sysctl_intvec, | |
244 | .extra1 = &min_sched_granularity_ns, | |
245 | .extra2 = &max_sched_granularity_ns, | |
77e54a1f | 246 | }, |
21805085 PZ |
247 | { |
248 | .ctl_name = CTL_UNNUMBERED, | |
249 | .procname = "sched_latency_ns", | |
250 | .data = &sysctl_sched_latency, | |
251 | .maxlen = sizeof(unsigned int), | |
252 | .mode = 0644, | |
b2be5e96 | 253 | .proc_handler = &sched_nr_latency_handler, |
21805085 PZ |
254 | .strategy = &sysctl_intvec, |
255 | .extra1 = &min_sched_granularity_ns, | |
256 | .extra2 = &max_sched_granularity_ns, | |
257 | }, | |
77e54a1f IM |
258 | { |
259 | .ctl_name = CTL_UNNUMBERED, | |
260 | .procname = "sched_wakeup_granularity_ns", | |
261 | .data = &sysctl_sched_wakeup_granularity, | |
262 | .maxlen = sizeof(unsigned int), | |
263 | .mode = 0644, | |
264 | .proc_handler = &proc_dointvec_minmax, | |
265 | .strategy = &sysctl_intvec, | |
266 | .extra1 = &min_wakeup_granularity_ns, | |
267 | .extra2 = &max_wakeup_granularity_ns, | |
268 | }, | |
269 | { | |
270 | .ctl_name = CTL_UNNUMBERED, | |
271 | .procname = "sched_batch_wakeup_granularity_ns", | |
272 | .data = &sysctl_sched_batch_wakeup_granularity, | |
273 | .maxlen = sizeof(unsigned int), | |
274 | .mode = 0644, | |
275 | .proc_handler = &proc_dointvec_minmax, | |
276 | .strategy = &sysctl_intvec, | |
277 | .extra1 = &min_wakeup_granularity_ns, | |
278 | .extra2 = &max_wakeup_granularity_ns, | |
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 | }, | |
1fc84aaa | 304 | #endif |
1799e35d IM |
305 | { |
306 | .ctl_name = CTL_UNNUMBERED, | |
307 | .procname = "sched_compat_yield", | |
308 | .data = &sysctl_sched_compat_yield, | |
309 | .maxlen = sizeof(unsigned int), | |
310 | .mode = 0644, | |
311 | .proc_handler = &proc_dointvec, | |
312 | }, | |
f20786ff PZ |
313 | #ifdef CONFIG_PROVE_LOCKING |
314 | { | |
315 | .ctl_name = CTL_UNNUMBERED, | |
316 | .procname = "prove_locking", | |
317 | .data = &prove_locking, | |
318 | .maxlen = sizeof(int), | |
319 | .mode = 0644, | |
320 | .proc_handler = &proc_dointvec, | |
321 | }, | |
322 | #endif | |
323 | #ifdef CONFIG_LOCK_STAT | |
324 | { | |
325 | .ctl_name = CTL_UNNUMBERED, | |
326 | .procname = "lock_stat", | |
327 | .data = &lock_stat, | |
328 | .maxlen = sizeof(int), | |
329 | .mode = 0644, | |
330 | .proc_handler = &proc_dointvec, | |
331 | }, | |
77e54a1f | 332 | #endif |
1da177e4 LT |
333 | { |
334 | .ctl_name = KERN_PANIC, | |
335 | .procname = "panic", | |
336 | .data = &panic_timeout, | |
337 | .maxlen = sizeof(int), | |
338 | .mode = 0644, | |
339 | .proc_handler = &proc_dointvec, | |
340 | }, | |
341 | { | |
342 | .ctl_name = KERN_CORE_USES_PID, | |
343 | .procname = "core_uses_pid", | |
344 | .data = &core_uses_pid, | |
345 | .maxlen = sizeof(int), | |
346 | .mode = 0644, | |
347 | .proc_handler = &proc_dointvec, | |
348 | }, | |
bdf4c48a PZ |
349 | #ifdef CONFIG_AUDITSYSCALL |
350 | { | |
351 | .ctl_name = CTL_UNNUMBERED, | |
352 | .procname = "audit_argv_kb", | |
353 | .data = &audit_argv_kb, | |
354 | .maxlen = sizeof(int), | |
355 | .mode = 0644, | |
356 | .proc_handler = &proc_dointvec, | |
357 | }, | |
358 | #endif | |
1da177e4 LT |
359 | { |
360 | .ctl_name = KERN_CORE_PATTERN, | |
361 | .procname = "core_pattern", | |
362 | .data = core_pattern, | |
71ce92f3 | 363 | .maxlen = CORENAME_MAX_SIZE, |
1da177e4 LT |
364 | .mode = 0644, |
365 | .proc_handler = &proc_dostring, | |
366 | .strategy = &sysctl_string, | |
367 | }, | |
34f5a398 | 368 | #ifdef CONFIG_PROC_SYSCTL |
1da177e4 | 369 | { |
1da177e4 LT |
370 | .procname = "tainted", |
371 | .data = &tainted, | |
372 | .maxlen = sizeof(int), | |
34f5a398 TT |
373 | .mode = 0644, |
374 | .proc_handler = &proc_dointvec_taint, | |
1da177e4 | 375 | }, |
34f5a398 | 376 | #endif |
72c2d582 | 377 | #ifdef CONFIG_SECURITY_CAPABILITIES |
1da177e4 | 378 | { |
1da177e4 LT |
379 | .procname = "cap-bound", |
380 | .data = &cap_bset, | |
381 | .maxlen = sizeof(kernel_cap_t), | |
382 | .mode = 0600, | |
383 | .proc_handler = &proc_dointvec_bset, | |
384 | }, | |
72c2d582 | 385 | #endif /* def CONFIG_SECURITY_CAPABILITIES */ |
1da177e4 LT |
386 | #ifdef CONFIG_BLK_DEV_INITRD |
387 | { | |
388 | .ctl_name = KERN_REALROOTDEV, | |
389 | .procname = "real-root-dev", | |
390 | .data = &real_root_dev, | |
391 | .maxlen = sizeof(int), | |
392 | .mode = 0644, | |
393 | .proc_handler = &proc_dointvec, | |
394 | }, | |
395 | #endif | |
45807a1d IM |
396 | { |
397 | .ctl_name = CTL_UNNUMBERED, | |
398 | .procname = "print-fatal-signals", | |
399 | .data = &print_fatal_signals, | |
400 | .maxlen = sizeof(int), | |
401 | .mode = 0644, | |
402 | .proc_handler = &proc_dointvec, | |
403 | }, | |
1da177e4 LT |
404 | #ifdef __sparc__ |
405 | { | |
406 | .ctl_name = KERN_SPARC_REBOOT, | |
407 | .procname = "reboot-cmd", | |
408 | .data = reboot_command, | |
409 | .maxlen = 256, | |
410 | .mode = 0644, | |
411 | .proc_handler = &proc_dostring, | |
412 | .strategy = &sysctl_string, | |
413 | }, | |
414 | { | |
415 | .ctl_name = KERN_SPARC_STOP_A, | |
416 | .procname = "stop-a", | |
417 | .data = &stop_a_enabled, | |
418 | .maxlen = sizeof (int), | |
419 | .mode = 0644, | |
420 | .proc_handler = &proc_dointvec, | |
421 | }, | |
422 | { | |
423 | .ctl_name = KERN_SPARC_SCONS_PWROFF, | |
424 | .procname = "scons-poweroff", | |
425 | .data = &scons_pwroff, | |
426 | .maxlen = sizeof (int), | |
427 | .mode = 0644, | |
428 | .proc_handler = &proc_dointvec, | |
429 | }, | |
430 | #endif | |
431 | #ifdef __hppa__ | |
432 | { | |
433 | .ctl_name = KERN_HPPA_PWRSW, | |
434 | .procname = "soft-power", | |
435 | .data = &pwrsw_enabled, | |
436 | .maxlen = sizeof (int), | |
437 | .mode = 0644, | |
438 | .proc_handler = &proc_dointvec, | |
439 | }, | |
440 | { | |
441 | .ctl_name = KERN_HPPA_UNALIGNED, | |
442 | .procname = "unaligned-trap", | |
443 | .data = &unaligned_enabled, | |
444 | .maxlen = sizeof (int), | |
445 | .mode = 0644, | |
446 | .proc_handler = &proc_dointvec, | |
447 | }, | |
448 | #endif | |
449 | { | |
450 | .ctl_name = KERN_CTLALTDEL, | |
451 | .procname = "ctrl-alt-del", | |
452 | .data = &C_A_D, | |
453 | .maxlen = sizeof(int), | |
454 | .mode = 0644, | |
455 | .proc_handler = &proc_dointvec, | |
456 | }, | |
457 | { | |
458 | .ctl_name = KERN_PRINTK, | |
459 | .procname = "printk", | |
460 | .data = &console_loglevel, | |
461 | .maxlen = 4*sizeof(int), | |
462 | .mode = 0644, | |
463 | .proc_handler = &proc_dointvec, | |
464 | }, | |
465 | #ifdef CONFIG_KMOD | |
466 | { | |
467 | .ctl_name = KERN_MODPROBE, | |
468 | .procname = "modprobe", | |
469 | .data = &modprobe_path, | |
470 | .maxlen = KMOD_PATH_LEN, | |
471 | .mode = 0644, | |
472 | .proc_handler = &proc_dostring, | |
473 | .strategy = &sysctl_string, | |
474 | }, | |
475 | #endif | |
57ae2508 | 476 | #if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET) |
1da177e4 LT |
477 | { |
478 | .ctl_name = KERN_HOTPLUG, | |
479 | .procname = "hotplug", | |
312c004d KS |
480 | .data = &uevent_helper, |
481 | .maxlen = UEVENT_HELPER_PATH_LEN, | |
1da177e4 LT |
482 | .mode = 0644, |
483 | .proc_handler = &proc_dostring, | |
484 | .strategy = &sysctl_string, | |
485 | }, | |
486 | #endif | |
487 | #ifdef CONFIG_CHR_DEV_SG | |
488 | { | |
489 | .ctl_name = KERN_SG_BIG_BUFF, | |
490 | .procname = "sg-big-buff", | |
491 | .data = &sg_big_buff, | |
492 | .maxlen = sizeof (int), | |
493 | .mode = 0444, | |
494 | .proc_handler = &proc_dointvec, | |
495 | }, | |
496 | #endif | |
497 | #ifdef CONFIG_BSD_PROCESS_ACCT | |
498 | { | |
499 | .ctl_name = KERN_ACCT, | |
500 | .procname = "acct", | |
501 | .data = &acct_parm, | |
502 | .maxlen = 3*sizeof(int), | |
503 | .mode = 0644, | |
504 | .proc_handler = &proc_dointvec, | |
505 | }, | |
506 | #endif | |
1da177e4 LT |
507 | #ifdef CONFIG_MAGIC_SYSRQ |
508 | { | |
509 | .ctl_name = KERN_SYSRQ, | |
510 | .procname = "sysrq", | |
5d6f647f | 511 | .data = &__sysrq_enabled, |
1da177e4 LT |
512 | .maxlen = sizeof (int), |
513 | .mode = 0644, | |
514 | .proc_handler = &proc_dointvec, | |
515 | }, | |
516 | #endif | |
d6f8ff73 | 517 | #ifdef CONFIG_PROC_SYSCTL |
1da177e4 | 518 | { |
1da177e4 | 519 | .procname = "cad_pid", |
9ec52099 | 520 | .data = NULL, |
1da177e4 LT |
521 | .maxlen = sizeof (int), |
522 | .mode = 0600, | |
9ec52099 | 523 | .proc_handler = &proc_do_cad_pid, |
1da177e4 | 524 | }, |
d6f8ff73 | 525 | #endif |
1da177e4 LT |
526 | { |
527 | .ctl_name = KERN_MAX_THREADS, | |
528 | .procname = "threads-max", | |
529 | .data = &max_threads, | |
530 | .maxlen = sizeof(int), | |
531 | .mode = 0644, | |
532 | .proc_handler = &proc_dointvec, | |
533 | }, | |
534 | { | |
535 | .ctl_name = KERN_RANDOM, | |
536 | .procname = "random", | |
537 | .mode = 0555, | |
538 | .child = random_table, | |
539 | }, | |
1da177e4 LT |
540 | { |
541 | .ctl_name = KERN_OVERFLOWUID, | |
542 | .procname = "overflowuid", | |
543 | .data = &overflowuid, | |
544 | .maxlen = sizeof(int), | |
545 | .mode = 0644, | |
546 | .proc_handler = &proc_dointvec_minmax, | |
547 | .strategy = &sysctl_intvec, | |
548 | .extra1 = &minolduid, | |
549 | .extra2 = &maxolduid, | |
550 | }, | |
551 | { | |
552 | .ctl_name = KERN_OVERFLOWGID, | |
553 | .procname = "overflowgid", | |
554 | .data = &overflowgid, | |
555 | .maxlen = sizeof(int), | |
556 | .mode = 0644, | |
557 | .proc_handler = &proc_dointvec_minmax, | |
558 | .strategy = &sysctl_intvec, | |
559 | .extra1 = &minolduid, | |
560 | .extra2 = &maxolduid, | |
561 | }, | |
347a8dc3 | 562 | #ifdef CONFIG_S390 |
1da177e4 LT |
563 | #ifdef CONFIG_MATHEMU |
564 | { | |
565 | .ctl_name = KERN_IEEE_EMULATION_WARNINGS, | |
566 | .procname = "ieee_emulation_warnings", | |
567 | .data = &sysctl_ieee_emulation_warnings, | |
568 | .maxlen = sizeof(int), | |
569 | .mode = 0644, | |
570 | .proc_handler = &proc_dointvec, | |
571 | }, | |
572 | #endif | |
573 | #ifdef CONFIG_NO_IDLE_HZ | |
574 | { | |
575 | .ctl_name = KERN_HZ_TIMER, | |
576 | .procname = "hz_timer", | |
577 | .data = &sysctl_hz_timer, | |
578 | .maxlen = sizeof(int), | |
579 | .mode = 0644, | |
580 | .proc_handler = &proc_dointvec, | |
581 | }, | |
582 | #endif | |
583 | { | |
584 | .ctl_name = KERN_S390_USER_DEBUG_LOGGING, | |
585 | .procname = "userprocess_debug", | |
586 | .data = &sysctl_userprocess_debug, | |
587 | .maxlen = sizeof(int), | |
588 | .mode = 0644, | |
589 | .proc_handler = &proc_dointvec, | |
590 | }, | |
591 | #endif | |
592 | { | |
593 | .ctl_name = KERN_PIDMAX, | |
594 | .procname = "pid_max", | |
595 | .data = &pid_max, | |
596 | .maxlen = sizeof (int), | |
597 | .mode = 0644, | |
598 | .proc_handler = &proc_dointvec_minmax, | |
599 | .strategy = sysctl_intvec, | |
600 | .extra1 = &pid_max_min, | |
601 | .extra2 = &pid_max_max, | |
602 | }, | |
603 | { | |
604 | .ctl_name = KERN_PANIC_ON_OOPS, | |
605 | .procname = "panic_on_oops", | |
606 | .data = &panic_on_oops, | |
607 | .maxlen = sizeof(int), | |
608 | .mode = 0644, | |
609 | .proc_handler = &proc_dointvec, | |
610 | }, | |
611 | { | |
612 | .ctl_name = KERN_PRINTK_RATELIMIT, | |
613 | .procname = "printk_ratelimit", | |
614 | .data = &printk_ratelimit_jiffies, | |
615 | .maxlen = sizeof(int), | |
616 | .mode = 0644, | |
617 | .proc_handler = &proc_dointvec_jiffies, | |
618 | .strategy = &sysctl_jiffies, | |
619 | }, | |
620 | { | |
621 | .ctl_name = KERN_PRINTK_RATELIMIT_BURST, | |
622 | .procname = "printk_ratelimit_burst", | |
623 | .data = &printk_ratelimit_burst, | |
624 | .maxlen = sizeof(int), | |
625 | .mode = 0644, | |
626 | .proc_handler = &proc_dointvec, | |
627 | }, | |
628 | { | |
629 | .ctl_name = KERN_NGROUPS_MAX, | |
630 | .procname = "ngroups_max", | |
631 | .data = &ngroups_max, | |
632 | .maxlen = sizeof (int), | |
633 | .mode = 0444, | |
634 | .proc_handler = &proc_dointvec, | |
635 | }, | |
636 | #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86) | |
637 | { | |
638 | .ctl_name = KERN_UNKNOWN_NMI_PANIC, | |
639 | .procname = "unknown_nmi_panic", | |
640 | .data = &unknown_nmi_panic, | |
641 | .maxlen = sizeof (int), | |
642 | .mode = 0644, | |
2fbe7b25 | 643 | .proc_handler = &proc_dointvec, |
1da177e4 | 644 | }, |
407984f1 | 645 | { |
407984f1 DZ |
646 | .procname = "nmi_watchdog", |
647 | .data = &nmi_watchdog_enabled, | |
648 | .maxlen = sizeof (int), | |
649 | .mode = 0644, | |
650 | .proc_handler = &proc_nmi_enabled, | |
1da177e4 LT |
651 | }, |
652 | #endif | |
653 | #if defined(CONFIG_X86) | |
8da5adda DZ |
654 | { |
655 | .ctl_name = KERN_PANIC_ON_NMI, | |
656 | .procname = "panic_on_unrecovered_nmi", | |
657 | .data = &panic_on_unrecovered_nmi, | |
658 | .maxlen = sizeof(int), | |
659 | .mode = 0644, | |
660 | .proc_handler = &proc_dointvec, | |
661 | }, | |
1da177e4 LT |
662 | { |
663 | .ctl_name = KERN_BOOTLOADER_TYPE, | |
664 | .procname = "bootloader_type", | |
665 | .data = &bootloader_type, | |
666 | .maxlen = sizeof (int), | |
667 | .mode = 0444, | |
668 | .proc_handler = &proc_dointvec, | |
669 | }, | |
0741f4d2 CE |
670 | { |
671 | .ctl_name = CTL_UNNUMBERED, | |
672 | .procname = "kstack_depth_to_print", | |
673 | .data = &kstack_depth_to_print, | |
674 | .maxlen = sizeof(int), | |
675 | .mode = 0644, | |
676 | .proc_handler = &proc_dointvec, | |
677 | }, | |
1da177e4 | 678 | #endif |
7a9166e3 | 679 | #if defined(CONFIG_MMU) |
1da177e4 LT |
680 | { |
681 | .ctl_name = KERN_RANDOMIZE, | |
682 | .procname = "randomize_va_space", | |
683 | .data = &randomize_va_space, | |
684 | .maxlen = sizeof(int), | |
685 | .mode = 0644, | |
686 | .proc_handler = &proc_dointvec, | |
687 | }, | |
7a9166e3 | 688 | #endif |
0152fb37 | 689 | #if defined(CONFIG_S390) && defined(CONFIG_SMP) |
951f22d5 MS |
690 | { |
691 | .ctl_name = KERN_SPIN_RETRY, | |
692 | .procname = "spin_retry", | |
693 | .data = &spin_retry, | |
694 | .maxlen = sizeof (int), | |
695 | .mode = 0644, | |
696 | .proc_handler = &proc_dointvec, | |
697 | }, | |
c255d844 | 698 | #endif |
673d5b43 | 699 | #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86) |
c255d844 | 700 | { |
c255d844 | 701 | .procname = "acpi_video_flags", |
77afcf78 | 702 | .data = &acpi_realmode_flags, |
c255d844 PM |
703 | .maxlen = sizeof (unsigned long), |
704 | .mode = 0644, | |
7f99f06f | 705 | .proc_handler = &proc_doulongvec_minmax, |
c255d844 | 706 | }, |
d2b176ed JS |
707 | #endif |
708 | #ifdef CONFIG_IA64 | |
709 | { | |
710 | .ctl_name = KERN_IA64_UNALIGNED, | |
711 | .procname = "ignore-unaligned-usertrap", | |
712 | .data = &no_unaligned_warning, | |
713 | .maxlen = sizeof (int), | |
714 | .mode = 0644, | |
715 | .proc_handler = &proc_dointvec, | |
716 | }, | |
bebfa101 | 717 | #endif |
c4f3b63f RT |
718 | #ifdef CONFIG_DETECT_SOFTLOCKUP |
719 | { | |
720 | .ctl_name = CTL_UNNUMBERED, | |
721 | .procname = "softlockup_thresh", | |
722 | .data = &softlockup_thresh, | |
723 | .maxlen = sizeof(int), | |
724 | .mode = 0644, | |
725 | .proc_handler = &proc_dointvec_minmax, | |
726 | .strategy = &sysctl_intvec, | |
727 | .extra1 = &one, | |
728 | .extra2 = &sixty, | |
729 | }, | |
730 | #endif | |
bebfa101 AK |
731 | #ifdef CONFIG_COMPAT |
732 | { | |
733 | .ctl_name = KERN_COMPAT_LOG, | |
734 | .procname = "compat-log", | |
735 | .data = &compat_log, | |
736 | .maxlen = sizeof (int), | |
737 | .mode = 0644, | |
738 | .proc_handler = &proc_dointvec, | |
739 | }, | |
951f22d5 | 740 | #endif |
23f78d4a IM |
741 | #ifdef CONFIG_RT_MUTEXES |
742 | { | |
743 | .ctl_name = KERN_MAX_LOCK_DEPTH, | |
744 | .procname = "max_lock_depth", | |
745 | .data = &max_lock_depth, | |
746 | .maxlen = sizeof(int), | |
747 | .mode = 0644, | |
748 | .proc_handler = &proc_dointvec, | |
749 | }, | |
750 | #endif | |
5096add8 KC |
751 | #ifdef CONFIG_PROC_FS |
752 | { | |
753 | .ctl_name = CTL_UNNUMBERED, | |
754 | .procname = "maps_protect", | |
755 | .data = &maps_protect, | |
756 | .maxlen = sizeof(int), | |
757 | .mode = 0644, | |
758 | .proc_handler = &proc_dointvec, | |
759 | }, | |
760 | #endif | |
10a0a8d4 JF |
761 | { |
762 | .ctl_name = CTL_UNNUMBERED, | |
763 | .procname = "poweroff_cmd", | |
764 | .data = &poweroff_cmd, | |
765 | .maxlen = POWEROFF_CMD_PATH_LEN, | |
766 | .mode = 0644, | |
767 | .proc_handler = &proc_dostring, | |
768 | .strategy = &sysctl_string, | |
769 | }, | |
ed2c12f3 AM |
770 | /* |
771 | * NOTE: do not add new entries to this table unless you have read | |
772 | * Documentation/sysctl/ctl_unnumbered.txt | |
773 | */ | |
1da177e4 LT |
774 | { .ctl_name = 0 } |
775 | }; | |
776 | ||
d8217f07 | 777 | static struct ctl_table vm_table[] = { |
1da177e4 LT |
778 | { |
779 | .ctl_name = VM_OVERCOMMIT_MEMORY, | |
780 | .procname = "overcommit_memory", | |
781 | .data = &sysctl_overcommit_memory, | |
782 | .maxlen = sizeof(sysctl_overcommit_memory), | |
783 | .mode = 0644, | |
784 | .proc_handler = &proc_dointvec, | |
785 | }, | |
fadd8fbd KH |
786 | { |
787 | .ctl_name = VM_PANIC_ON_OOM, | |
788 | .procname = "panic_on_oom", | |
789 | .data = &sysctl_panic_on_oom, | |
790 | .maxlen = sizeof(sysctl_panic_on_oom), | |
791 | .mode = 0644, | |
792 | .proc_handler = &proc_dointvec, | |
793 | }, | |
fe071d7e DR |
794 | { |
795 | .ctl_name = CTL_UNNUMBERED, | |
796 | .procname = "oom_kill_allocating_task", | |
797 | .data = &sysctl_oom_kill_allocating_task, | |
798 | .maxlen = sizeof(sysctl_oom_kill_allocating_task), | |
799 | .mode = 0644, | |
800 | .proc_handler = &proc_dointvec, | |
801 | }, | |
1da177e4 LT |
802 | { |
803 | .ctl_name = VM_OVERCOMMIT_RATIO, | |
804 | .procname = "overcommit_ratio", | |
805 | .data = &sysctl_overcommit_ratio, | |
806 | .maxlen = sizeof(sysctl_overcommit_ratio), | |
807 | .mode = 0644, | |
808 | .proc_handler = &proc_dointvec, | |
809 | }, | |
810 | { | |
811 | .ctl_name = VM_PAGE_CLUSTER, | |
812 | .procname = "page-cluster", | |
813 | .data = &page_cluster, | |
814 | .maxlen = sizeof(int), | |
815 | .mode = 0644, | |
816 | .proc_handler = &proc_dointvec, | |
817 | }, | |
818 | { | |
819 | .ctl_name = VM_DIRTY_BACKGROUND, | |
820 | .procname = "dirty_background_ratio", | |
821 | .data = &dirty_background_ratio, | |
822 | .maxlen = sizeof(dirty_background_ratio), | |
823 | .mode = 0644, | |
824 | .proc_handler = &proc_dointvec_minmax, | |
825 | .strategy = &sysctl_intvec, | |
826 | .extra1 = &zero, | |
827 | .extra2 = &one_hundred, | |
828 | }, | |
829 | { | |
830 | .ctl_name = VM_DIRTY_RATIO, | |
831 | .procname = "dirty_ratio", | |
832 | .data = &vm_dirty_ratio, | |
833 | .maxlen = sizeof(vm_dirty_ratio), | |
834 | .mode = 0644, | |
04fbfdc1 | 835 | .proc_handler = &dirty_ratio_handler, |
1da177e4 LT |
836 | .strategy = &sysctl_intvec, |
837 | .extra1 = &zero, | |
838 | .extra2 = &one_hundred, | |
839 | }, | |
840 | { | |
1da177e4 | 841 | .procname = "dirty_writeback_centisecs", |
f6ef9438 BS |
842 | .data = &dirty_writeback_interval, |
843 | .maxlen = sizeof(dirty_writeback_interval), | |
1da177e4 LT |
844 | .mode = 0644, |
845 | .proc_handler = &dirty_writeback_centisecs_handler, | |
846 | }, | |
847 | { | |
1da177e4 | 848 | .procname = "dirty_expire_centisecs", |
f6ef9438 BS |
849 | .data = &dirty_expire_interval, |
850 | .maxlen = sizeof(dirty_expire_interval), | |
1da177e4 | 851 | .mode = 0644, |
f6ef9438 | 852 | .proc_handler = &proc_dointvec_userhz_jiffies, |
1da177e4 LT |
853 | }, |
854 | { | |
855 | .ctl_name = VM_NR_PDFLUSH_THREADS, | |
856 | .procname = "nr_pdflush_threads", | |
857 | .data = &nr_pdflush_threads, | |
858 | .maxlen = sizeof nr_pdflush_threads, | |
859 | .mode = 0444 /* read-only*/, | |
860 | .proc_handler = &proc_dointvec, | |
861 | }, | |
862 | { | |
863 | .ctl_name = VM_SWAPPINESS, | |
864 | .procname = "swappiness", | |
865 | .data = &vm_swappiness, | |
866 | .maxlen = sizeof(vm_swappiness), | |
867 | .mode = 0644, | |
868 | .proc_handler = &proc_dointvec_minmax, | |
869 | .strategy = &sysctl_intvec, | |
870 | .extra1 = &zero, | |
871 | .extra2 = &one_hundred, | |
872 | }, | |
873 | #ifdef CONFIG_HUGETLB_PAGE | |
874 | { | |
1da177e4 LT |
875 | .procname = "nr_hugepages", |
876 | .data = &max_huge_pages, | |
877 | .maxlen = sizeof(unsigned long), | |
878 | .mode = 0644, | |
879 | .proc_handler = &hugetlb_sysctl_handler, | |
880 | .extra1 = (void *)&hugetlb_zero, | |
881 | .extra2 = (void *)&hugetlb_infinity, | |
882 | }, | |
883 | { | |
884 | .ctl_name = VM_HUGETLB_GROUP, | |
885 | .procname = "hugetlb_shm_group", | |
886 | .data = &sysctl_hugetlb_shm_group, | |
887 | .maxlen = sizeof(gid_t), | |
888 | .mode = 0644, | |
889 | .proc_handler = &proc_dointvec, | |
890 | }, | |
396faf03 MG |
891 | { |
892 | .ctl_name = CTL_UNNUMBERED, | |
893 | .procname = "hugepages_treat_as_movable", | |
894 | .data = &hugepages_treat_as_movable, | |
895 | .maxlen = sizeof(int), | |
896 | .mode = 0644, | |
897 | .proc_handler = &hugetlb_treat_movable_handler, | |
898 | }, | |
54f9f80d AL |
899 | { |
900 | .ctl_name = CTL_UNNUMBERED, | |
901 | .procname = "hugetlb_dynamic_pool", | |
902 | .data = &hugetlb_dynamic_pool, | |
903 | .maxlen = sizeof(hugetlb_dynamic_pool), | |
904 | .mode = 0644, | |
905 | .proc_handler = &proc_dointvec, | |
906 | }, | |
1da177e4 LT |
907 | #endif |
908 | { | |
909 | .ctl_name = VM_LOWMEM_RESERVE_RATIO, | |
910 | .procname = "lowmem_reserve_ratio", | |
911 | .data = &sysctl_lowmem_reserve_ratio, | |
912 | .maxlen = sizeof(sysctl_lowmem_reserve_ratio), | |
913 | .mode = 0644, | |
914 | .proc_handler = &lowmem_reserve_ratio_sysctl_handler, | |
915 | .strategy = &sysctl_intvec, | |
916 | }, | |
9d0243bc AM |
917 | { |
918 | .ctl_name = VM_DROP_PAGECACHE, | |
919 | .procname = "drop_caches", | |
920 | .data = &sysctl_drop_caches, | |
921 | .maxlen = sizeof(int), | |
922 | .mode = 0644, | |
923 | .proc_handler = drop_caches_sysctl_handler, | |
924 | .strategy = &sysctl_intvec, | |
925 | }, | |
1da177e4 LT |
926 | { |
927 | .ctl_name = VM_MIN_FREE_KBYTES, | |
928 | .procname = "min_free_kbytes", | |
929 | .data = &min_free_kbytes, | |
930 | .maxlen = sizeof(min_free_kbytes), | |
931 | .mode = 0644, | |
932 | .proc_handler = &min_free_kbytes_sysctl_handler, | |
933 | .strategy = &sysctl_intvec, | |
934 | .extra1 = &zero, | |
935 | }, | |
8ad4b1fb RS |
936 | { |
937 | .ctl_name = VM_PERCPU_PAGELIST_FRACTION, | |
938 | .procname = "percpu_pagelist_fraction", | |
939 | .data = &percpu_pagelist_fraction, | |
940 | .maxlen = sizeof(percpu_pagelist_fraction), | |
941 | .mode = 0644, | |
942 | .proc_handler = &percpu_pagelist_fraction_sysctl_handler, | |
943 | .strategy = &sysctl_intvec, | |
944 | .extra1 = &min_percpu_pagelist_fract, | |
945 | }, | |
1da177e4 LT |
946 | #ifdef CONFIG_MMU |
947 | { | |
948 | .ctl_name = VM_MAX_MAP_COUNT, | |
949 | .procname = "max_map_count", | |
950 | .data = &sysctl_max_map_count, | |
951 | .maxlen = sizeof(sysctl_max_map_count), | |
952 | .mode = 0644, | |
953 | .proc_handler = &proc_dointvec | |
954 | }, | |
955 | #endif | |
956 | { | |
957 | .ctl_name = VM_LAPTOP_MODE, | |
958 | .procname = "laptop_mode", | |
959 | .data = &laptop_mode, | |
960 | .maxlen = sizeof(laptop_mode), | |
961 | .mode = 0644, | |
ed5b43f1 BS |
962 | .proc_handler = &proc_dointvec_jiffies, |
963 | .strategy = &sysctl_jiffies, | |
1da177e4 LT |
964 | }, |
965 | { | |
966 | .ctl_name = VM_BLOCK_DUMP, | |
967 | .procname = "block_dump", | |
968 | .data = &block_dump, | |
969 | .maxlen = sizeof(block_dump), | |
970 | .mode = 0644, | |
971 | .proc_handler = &proc_dointvec, | |
972 | .strategy = &sysctl_intvec, | |
973 | .extra1 = &zero, | |
974 | }, | |
975 | { | |
976 | .ctl_name = VM_VFS_CACHE_PRESSURE, | |
977 | .procname = "vfs_cache_pressure", | |
978 | .data = &sysctl_vfs_cache_pressure, | |
979 | .maxlen = sizeof(sysctl_vfs_cache_pressure), | |
980 | .mode = 0644, | |
981 | .proc_handler = &proc_dointvec, | |
982 | .strategy = &sysctl_intvec, | |
983 | .extra1 = &zero, | |
984 | }, | |
985 | #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT | |
986 | { | |
987 | .ctl_name = VM_LEGACY_VA_LAYOUT, | |
988 | .procname = "legacy_va_layout", | |
989 | .data = &sysctl_legacy_va_layout, | |
990 | .maxlen = sizeof(sysctl_legacy_va_layout), | |
991 | .mode = 0644, | |
992 | .proc_handler = &proc_dointvec, | |
993 | .strategy = &sysctl_intvec, | |
994 | .extra1 = &zero, | |
995 | }, | |
996 | #endif | |
1743660b CL |
997 | #ifdef CONFIG_NUMA |
998 | { | |
999 | .ctl_name = VM_ZONE_RECLAIM_MODE, | |
1000 | .procname = "zone_reclaim_mode", | |
1001 | .data = &zone_reclaim_mode, | |
1002 | .maxlen = sizeof(zone_reclaim_mode), | |
1003 | .mode = 0644, | |
1004 | .proc_handler = &proc_dointvec, | |
c84db23c CL |
1005 | .strategy = &sysctl_intvec, |
1006 | .extra1 = &zero, | |
1743660b | 1007 | }, |
9614634f CL |
1008 | { |
1009 | .ctl_name = VM_MIN_UNMAPPED, | |
1010 | .procname = "min_unmapped_ratio", | |
1011 | .data = &sysctl_min_unmapped_ratio, | |
1012 | .maxlen = sizeof(sysctl_min_unmapped_ratio), | |
1013 | .mode = 0644, | |
1014 | .proc_handler = &sysctl_min_unmapped_ratio_sysctl_handler, | |
1015 | .strategy = &sysctl_intvec, | |
1016 | .extra1 = &zero, | |
1017 | .extra2 = &one_hundred, | |
1018 | }, | |
0ff38490 CL |
1019 | { |
1020 | .ctl_name = VM_MIN_SLAB, | |
1021 | .procname = "min_slab_ratio", | |
1022 | .data = &sysctl_min_slab_ratio, | |
1023 | .maxlen = sizeof(sysctl_min_slab_ratio), | |
1024 | .mode = 0644, | |
1025 | .proc_handler = &sysctl_min_slab_ratio_sysctl_handler, | |
1026 | .strategy = &sysctl_intvec, | |
1027 | .extra1 = &zero, | |
1028 | .extra2 = &one_hundred, | |
1029 | }, | |
e6e5494c | 1030 | #endif |
77461ab3 CL |
1031 | #ifdef CONFIG_SMP |
1032 | { | |
1033 | .ctl_name = CTL_UNNUMBERED, | |
1034 | .procname = "stat_interval", | |
1035 | .data = &sysctl_stat_interval, | |
1036 | .maxlen = sizeof(sysctl_stat_interval), | |
1037 | .mode = 0644, | |
1038 | .proc_handler = &proc_dointvec_jiffies, | |
1039 | .strategy = &sysctl_jiffies, | |
1040 | }, | |
1041 | #endif | |
ed032189 EP |
1042 | #ifdef CONFIG_SECURITY |
1043 | { | |
1044 | .ctl_name = CTL_UNNUMBERED, | |
1045 | .procname = "mmap_min_addr", | |
1046 | .data = &mmap_min_addr, | |
1047 | .maxlen = sizeof(unsigned long), | |
1048 | .mode = 0644, | |
1049 | .proc_handler = &proc_doulongvec_minmax, | |
1050 | }, | |
8daec965 | 1051 | #endif |
f0c0b2b8 KH |
1052 | #ifdef CONFIG_NUMA |
1053 | { | |
1054 | .ctl_name = CTL_UNNUMBERED, | |
1055 | .procname = "numa_zonelist_order", | |
1056 | .data = &numa_zonelist_order, | |
1057 | .maxlen = NUMA_ZONELIST_ORDER_LEN, | |
1058 | .mode = 0644, | |
1059 | .proc_handler = &numa_zonelist_order_handler, | |
1060 | .strategy = &sysctl_string, | |
1061 | }, | |
1062 | #endif | |
2b8232ce | 1063 | #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \ |
5c36e657 | 1064 | (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL)) |
e6e5494c IM |
1065 | { |
1066 | .ctl_name = VM_VDSO_ENABLED, | |
1067 | .procname = "vdso_enabled", | |
1068 | .data = &vdso_enabled, | |
1069 | .maxlen = sizeof(vdso_enabled), | |
1070 | .mode = 0644, | |
1071 | .proc_handler = &proc_dointvec, | |
1072 | .strategy = &sysctl_intvec, | |
1073 | .extra1 = &zero, | |
1074 | }, | |
1da177e4 | 1075 | #endif |
2be7fe07 AM |
1076 | /* |
1077 | * NOTE: do not add new entries to this table unless you have read | |
1078 | * Documentation/sysctl/ctl_unnumbered.txt | |
1079 | */ | |
1da177e4 LT |
1080 | { .ctl_name = 0 } |
1081 | }; | |
1082 | ||
2abc26fc | 1083 | #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) |
d8217f07 | 1084 | static struct ctl_table binfmt_misc_table[] = { |
2abc26fc EB |
1085 | { .ctl_name = 0 } |
1086 | }; | |
1087 | #endif | |
1088 | ||
d8217f07 | 1089 | static struct ctl_table fs_table[] = { |
1da177e4 LT |
1090 | { |
1091 | .ctl_name = FS_NRINODE, | |
1092 | .procname = "inode-nr", | |
1093 | .data = &inodes_stat, | |
1094 | .maxlen = 2*sizeof(int), | |
1095 | .mode = 0444, | |
1096 | .proc_handler = &proc_dointvec, | |
1097 | }, | |
1098 | { | |
1099 | .ctl_name = FS_STATINODE, | |
1100 | .procname = "inode-state", | |
1101 | .data = &inodes_stat, | |
1102 | .maxlen = 7*sizeof(int), | |
1103 | .mode = 0444, | |
1104 | .proc_handler = &proc_dointvec, | |
1105 | }, | |
1106 | { | |
1da177e4 LT |
1107 | .procname = "file-nr", |
1108 | .data = &files_stat, | |
1109 | .maxlen = 3*sizeof(int), | |
1110 | .mode = 0444, | |
529bf6be | 1111 | .proc_handler = &proc_nr_files, |
1da177e4 LT |
1112 | }, |
1113 | { | |
1114 | .ctl_name = FS_MAXFILE, | |
1115 | .procname = "file-max", | |
1116 | .data = &files_stat.max_files, | |
1117 | .maxlen = sizeof(int), | |
1118 | .mode = 0644, | |
1119 | .proc_handler = &proc_dointvec, | |
1120 | }, | |
1121 | { | |
1122 | .ctl_name = FS_DENTRY, | |
1123 | .procname = "dentry-state", | |
1124 | .data = &dentry_stat, | |
1125 | .maxlen = 6*sizeof(int), | |
1126 | .mode = 0444, | |
1127 | .proc_handler = &proc_dointvec, | |
1128 | }, | |
1129 | { | |
1130 | .ctl_name = FS_OVERFLOWUID, | |
1131 | .procname = "overflowuid", | |
1132 | .data = &fs_overflowuid, | |
1133 | .maxlen = sizeof(int), | |
1134 | .mode = 0644, | |
1135 | .proc_handler = &proc_dointvec_minmax, | |
1136 | .strategy = &sysctl_intvec, | |
1137 | .extra1 = &minolduid, | |
1138 | .extra2 = &maxolduid, | |
1139 | }, | |
1140 | { | |
1141 | .ctl_name = FS_OVERFLOWGID, | |
1142 | .procname = "overflowgid", | |
1143 | .data = &fs_overflowgid, | |
1144 | .maxlen = sizeof(int), | |
1145 | .mode = 0644, | |
1146 | .proc_handler = &proc_dointvec_minmax, | |
1147 | .strategy = &sysctl_intvec, | |
1148 | .extra1 = &minolduid, | |
1149 | .extra2 = &maxolduid, | |
1150 | }, | |
1151 | { | |
1152 | .ctl_name = FS_LEASES, | |
1153 | .procname = "leases-enable", | |
1154 | .data = &leases_enable, | |
1155 | .maxlen = sizeof(int), | |
1156 | .mode = 0644, | |
1157 | .proc_handler = &proc_dointvec, | |
1158 | }, | |
1159 | #ifdef CONFIG_DNOTIFY | |
1160 | { | |
1161 | .ctl_name = FS_DIR_NOTIFY, | |
1162 | .procname = "dir-notify-enable", | |
1163 | .data = &dir_notify_enable, | |
1164 | .maxlen = sizeof(int), | |
1165 | .mode = 0644, | |
1166 | .proc_handler = &proc_dointvec, | |
1167 | }, | |
1168 | #endif | |
1169 | #ifdef CONFIG_MMU | |
1170 | { | |
1171 | .ctl_name = FS_LEASE_TIME, | |
1172 | .procname = "lease-break-time", | |
1173 | .data = &lease_break_time, | |
1174 | .maxlen = sizeof(int), | |
1175 | .mode = 0644, | |
76fdbb25 KH |
1176 | .proc_handler = &proc_dointvec_minmax, |
1177 | .strategy = &sysctl_intvec, | |
1178 | .extra1 = &zero, | |
1179 | .extra2 = &two, | |
1da177e4 LT |
1180 | }, |
1181 | { | |
1da177e4 LT |
1182 | .procname = "aio-nr", |
1183 | .data = &aio_nr, | |
1184 | .maxlen = sizeof(aio_nr), | |
1185 | .mode = 0444, | |
d55b5fda | 1186 | .proc_handler = &proc_doulongvec_minmax, |
1da177e4 LT |
1187 | }, |
1188 | { | |
1da177e4 LT |
1189 | .procname = "aio-max-nr", |
1190 | .data = &aio_max_nr, | |
1191 | .maxlen = sizeof(aio_max_nr), | |
1192 | .mode = 0644, | |
d55b5fda | 1193 | .proc_handler = &proc_doulongvec_minmax, |
1da177e4 | 1194 | }, |
2d9048e2 | 1195 | #ifdef CONFIG_INOTIFY_USER |
0399cb08 RL |
1196 | { |
1197 | .ctl_name = FS_INOTIFY, | |
1198 | .procname = "inotify", | |
1199 | .mode = 0555, | |
1200 | .child = inotify_table, | |
1201 | }, | |
1202 | #endif | |
1da177e4 | 1203 | #endif |
d6e71144 AC |
1204 | { |
1205 | .ctl_name = KERN_SETUID_DUMPABLE, | |
1206 | .procname = "suid_dumpable", | |
1207 | .data = &suid_dumpable, | |
1208 | .maxlen = sizeof(int), | |
1209 | .mode = 0644, | |
1210 | .proc_handler = &proc_dointvec, | |
1211 | }, | |
2abc26fc EB |
1212 | #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) |
1213 | { | |
1214 | .ctl_name = CTL_UNNUMBERED, | |
1215 | .procname = "binfmt_misc", | |
1216 | .mode = 0555, | |
1217 | .child = binfmt_misc_table, | |
1218 | }, | |
1219 | #endif | |
2be7fe07 AM |
1220 | /* |
1221 | * NOTE: do not add new entries to this table unless you have read | |
1222 | * Documentation/sysctl/ctl_unnumbered.txt | |
2be7fe07 | 1223 | */ |
1da177e4 LT |
1224 | { .ctl_name = 0 } |
1225 | }; | |
1226 | ||
d8217f07 | 1227 | static struct ctl_table debug_table[] = { |
d0c3d534 | 1228 | #if defined(CONFIG_X86) || defined(CONFIG_PPC) |
abd4f750 MAS |
1229 | { |
1230 | .ctl_name = CTL_UNNUMBERED, | |
1231 | .procname = "exception-trace", | |
1232 | .data = &show_unhandled_signals, | |
1233 | .maxlen = sizeof(int), | |
1234 | .mode = 0644, | |
1235 | .proc_handler = proc_dointvec | |
1236 | }, | |
1237 | #endif | |
1da177e4 LT |
1238 | { .ctl_name = 0 } |
1239 | }; | |
1240 | ||
d8217f07 | 1241 | static struct ctl_table dev_table[] = { |
1da177e4 | 1242 | { .ctl_name = 0 } |
0eeca283 | 1243 | }; |
1da177e4 | 1244 | |
330d57fb AV |
1245 | static DEFINE_SPINLOCK(sysctl_lock); |
1246 | ||
1247 | /* called under sysctl_lock */ | |
1248 | static int use_table(struct ctl_table_header *p) | |
1249 | { | |
1250 | if (unlikely(p->unregistering)) | |
1251 | return 0; | |
1252 | p->used++; | |
1253 | return 1; | |
1254 | } | |
1255 | ||
1256 | /* called under sysctl_lock */ | |
1257 | static void unuse_table(struct ctl_table_header *p) | |
1258 | { | |
1259 | if (!--p->used) | |
1260 | if (unlikely(p->unregistering)) | |
1261 | complete(p->unregistering); | |
1262 | } | |
1263 | ||
1264 | /* called under sysctl_lock, will reacquire if has to wait */ | |
1265 | static void start_unregistering(struct ctl_table_header *p) | |
1266 | { | |
1267 | /* | |
1268 | * if p->used is 0, nobody will ever touch that entry again; | |
1269 | * we'll eliminate all paths to it before dropping sysctl_lock | |
1270 | */ | |
1271 | if (unlikely(p->used)) { | |
1272 | struct completion wait; | |
1273 | init_completion(&wait); | |
1274 | p->unregistering = &wait; | |
1275 | spin_unlock(&sysctl_lock); | |
1276 | wait_for_completion(&wait); | |
1277 | spin_lock(&sysctl_lock); | |
1278 | } | |
1279 | /* | |
1280 | * do not remove from the list until nobody holds it; walking the | |
1281 | * list in do_sysctl() relies on that. | |
1282 | */ | |
1283 | list_del_init(&p->ctl_entry); | |
1284 | } | |
1285 | ||
805b5d5e EB |
1286 | void sysctl_head_finish(struct ctl_table_header *head) |
1287 | { | |
1288 | if (!head) | |
1289 | return; | |
1290 | spin_lock(&sysctl_lock); | |
1291 | unuse_table(head); | |
1292 | spin_unlock(&sysctl_lock); | |
1293 | } | |
1294 | ||
1295 | struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev) | |
1296 | { | |
1297 | struct ctl_table_header *head; | |
1298 | struct list_head *tmp; | |
1299 | spin_lock(&sysctl_lock); | |
1300 | if (prev) { | |
1301 | tmp = &prev->ctl_entry; | |
1302 | unuse_table(prev); | |
1303 | goto next; | |
1304 | } | |
1305 | tmp = &root_table_header.ctl_entry; | |
1306 | for (;;) { | |
1307 | head = list_entry(tmp, struct ctl_table_header, ctl_entry); | |
1308 | ||
1309 | if (!use_table(head)) | |
1310 | goto next; | |
1311 | spin_unlock(&sysctl_lock); | |
1312 | return head; | |
1313 | next: | |
1314 | tmp = tmp->next; | |
1315 | if (tmp == &root_table_header.ctl_entry) | |
1316 | break; | |
1317 | } | |
1318 | spin_unlock(&sysctl_lock); | |
1319 | return NULL; | |
1320 | } | |
1321 | ||
b89a8171 | 1322 | #ifdef CONFIG_SYSCTL_SYSCALL |
1da177e4 LT |
1323 | int do_sysctl(int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp, |
1324 | void __user *newval, size_t newlen) | |
1325 | { | |
805b5d5e | 1326 | struct ctl_table_header *head; |
330d57fb | 1327 | int error = -ENOTDIR; |
1da177e4 LT |
1328 | |
1329 | if (nlen <= 0 || nlen >= CTL_MAXNAME) | |
1330 | return -ENOTDIR; | |
1331 | if (oldval) { | |
1332 | int old_len; | |
1333 | if (!oldlenp || get_user(old_len, oldlenp)) | |
1334 | return -EFAULT; | |
1335 | } | |
330d57fb | 1336 | |
805b5d5e EB |
1337 | for (head = sysctl_head_next(NULL); head; |
1338 | head = sysctl_head_next(head)) { | |
330d57fb | 1339 | error = parse_table(name, nlen, oldval, oldlenp, |
1f29bcd7 | 1340 | newval, newlen, head->ctl_table); |
805b5d5e EB |
1341 | if (error != -ENOTDIR) { |
1342 | sysctl_head_finish(head); | |
330d57fb | 1343 | break; |
805b5d5e EB |
1344 | } |
1345 | } | |
330d57fb | 1346 | return error; |
1da177e4 LT |
1347 | } |
1348 | ||
1349 | asmlinkage long sys_sysctl(struct __sysctl_args __user *args) | |
1350 | { | |
1351 | struct __sysctl_args tmp; | |
1352 | int error; | |
1353 | ||
1354 | if (copy_from_user(&tmp, args, sizeof(tmp))) | |
1355 | return -EFAULT; | |
1356 | ||
7058cb02 EB |
1357 | error = deprecated_sysctl_warning(&tmp); |
1358 | if (error) | |
1359 | goto out; | |
1360 | ||
1da177e4 LT |
1361 | lock_kernel(); |
1362 | error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp, | |
1363 | tmp.newval, tmp.newlen); | |
1364 | unlock_kernel(); | |
7058cb02 | 1365 | out: |
1da177e4 LT |
1366 | return error; |
1367 | } | |
b89a8171 | 1368 | #endif /* CONFIG_SYSCTL_SYSCALL */ |
1da177e4 LT |
1369 | |
1370 | /* | |
1ff007eb | 1371 | * sysctl_perm does NOT grant the superuser all rights automatically, because |
1da177e4 LT |
1372 | * some sysctl variables are readonly even to root. |
1373 | */ | |
1374 | ||
1375 | static int test_perm(int mode, int op) | |
1376 | { | |
1377 | if (!current->euid) | |
1378 | mode >>= 6; | |
1379 | else if (in_egroup_p(0)) | |
1380 | mode >>= 3; | |
1381 | if ((mode & op & 0007) == op) | |
1382 | return 0; | |
1383 | return -EACCES; | |
1384 | } | |
1385 | ||
d8217f07 | 1386 | int sysctl_perm(struct ctl_table *table, int op) |
1da177e4 LT |
1387 | { |
1388 | int error; | |
1389 | error = security_sysctl(table, op); | |
1390 | if (error) | |
1391 | return error; | |
1392 | return test_perm(table->mode, op); | |
1393 | } | |
1394 | ||
b89a8171 | 1395 | #ifdef CONFIG_SYSCTL_SYSCALL |
1da177e4 LT |
1396 | static int parse_table(int __user *name, int nlen, |
1397 | void __user *oldval, size_t __user *oldlenp, | |
1398 | void __user *newval, size_t newlen, | |
d8217f07 | 1399 | struct ctl_table *table) |
1da177e4 LT |
1400 | { |
1401 | int n; | |
1402 | repeat: | |
1403 | if (!nlen) | |
1404 | return -ENOTDIR; | |
1405 | if (get_user(n, name)) | |
1406 | return -EFAULT; | |
d99f160a EB |
1407 | for ( ; table->ctl_name || table->procname; table++) { |
1408 | if (!table->ctl_name) | |
1409 | continue; | |
6703ddfc | 1410 | if (n == table->ctl_name) { |
1da177e4 LT |
1411 | int error; |
1412 | if (table->child) { | |
1ff007eb | 1413 | if (sysctl_perm(table, 001)) |
1da177e4 | 1414 | return -EPERM; |
1da177e4 LT |
1415 | name++; |
1416 | nlen--; | |
1417 | table = table->child; | |
1418 | goto repeat; | |
1419 | } | |
1420 | error = do_sysctl_strategy(table, name, nlen, | |
1421 | oldval, oldlenp, | |
1f29bcd7 | 1422 | newval, newlen); |
1da177e4 LT |
1423 | return error; |
1424 | } | |
1425 | } | |
1426 | return -ENOTDIR; | |
1427 | } | |
1428 | ||
1429 | /* Perform the actual read/write of a sysctl table entry. */ | |
d8217f07 | 1430 | int do_sysctl_strategy (struct ctl_table *table, |
1da177e4 LT |
1431 | int __user *name, int nlen, |
1432 | void __user *oldval, size_t __user *oldlenp, | |
1f29bcd7 | 1433 | void __user *newval, size_t newlen) |
1da177e4 LT |
1434 | { |
1435 | int op = 0, rc; | |
1da177e4 LT |
1436 | |
1437 | if (oldval) | |
1438 | op |= 004; | |
1439 | if (newval) | |
1440 | op |= 002; | |
1ff007eb | 1441 | if (sysctl_perm(table, op)) |
1da177e4 LT |
1442 | return -EPERM; |
1443 | ||
1444 | if (table->strategy) { | |
1445 | rc = table->strategy(table, name, nlen, oldval, oldlenp, | |
1f29bcd7 | 1446 | newval, newlen); |
1da177e4 LT |
1447 | if (rc < 0) |
1448 | return rc; | |
1449 | if (rc > 0) | |
1450 | return 0; | |
1451 | } | |
1452 | ||
1453 | /* If there is no strategy routine, or if the strategy returns | |
1454 | * zero, proceed with automatic r/w */ | |
1455 | if (table->data && table->maxlen) { | |
49a0c458 EB |
1456 | rc = sysctl_data(table, name, nlen, oldval, oldlenp, |
1457 | newval, newlen); | |
1458 | if (rc < 0) | |
1459 | return rc; | |
1da177e4 LT |
1460 | } |
1461 | return 0; | |
1462 | } | |
b89a8171 | 1463 | #endif /* CONFIG_SYSCTL_SYSCALL */ |
1da177e4 | 1464 | |
d912b0cc EB |
1465 | static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table) |
1466 | { | |
1467 | for (; table->ctl_name || table->procname; table++) { | |
1468 | table->parent = parent; | |
1469 | if (table->child) | |
1470 | sysctl_set_parent(table, table->child); | |
1471 | } | |
1472 | } | |
1473 | ||
1474 | static __init int sysctl_init(void) | |
1475 | { | |
fc6cd25b | 1476 | int err; |
d912b0cc | 1477 | sysctl_set_parent(NULL, root_table); |
fc6cd25b | 1478 | err = sysctl_check_table(root_table); |
d912b0cc EB |
1479 | return 0; |
1480 | } | |
1481 | ||
1482 | core_initcall(sysctl_init); | |
1483 | ||
1da177e4 LT |
1484 | /** |
1485 | * register_sysctl_table - register a sysctl hierarchy | |
1486 | * @table: the top-level table structure | |
1da177e4 LT |
1487 | * |
1488 | * Register a sysctl table hierarchy. @table should be a filled in ctl_table | |
1489 | * array. An entry with a ctl_name of 0 terminates the table. | |
1490 | * | |
d8217f07 | 1491 | * The members of the &struct ctl_table structure are used as follows: |
1da177e4 LT |
1492 | * |
1493 | * ctl_name - This is the numeric sysctl value used by sysctl(2). The number | |
1494 | * must be unique within that level of sysctl | |
1495 | * | |
1496 | * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not | |
1497 | * enter a sysctl file | |
1498 | * | |
1499 | * data - a pointer to data for use by proc_handler | |
1500 | * | |
1501 | * maxlen - the maximum size in bytes of the data | |
1502 | * | |
1503 | * mode - the file permissions for the /proc/sys file, and for sysctl(2) | |
1504 | * | |
1505 | * child - a pointer to the child sysctl table if this entry is a directory, or | |
1506 | * %NULL. | |
1507 | * | |
1508 | * proc_handler - the text handler routine (described below) | |
1509 | * | |
1510 | * strategy - the strategy routine (described below) | |
1511 | * | |
1512 | * de - for internal use by the sysctl routines | |
1513 | * | |
1514 | * extra1, extra2 - extra pointers usable by the proc handler routines | |
1515 | * | |
1516 | * Leaf nodes in the sysctl tree will be represented by a single file | |
1517 | * under /proc; non-leaf nodes will be represented by directories. | |
1518 | * | |
1519 | * sysctl(2) can automatically manage read and write requests through | |
1520 | * the sysctl table. The data and maxlen fields of the ctl_table | |
1521 | * struct enable minimal validation of the values being written to be | |
1522 | * performed, and the mode field allows minimal authentication. | |
1523 | * | |
1524 | * More sophisticated management can be enabled by the provision of a | |
1525 | * strategy routine with the table entry. This will be called before | |
1526 | * any automatic read or write of the data is performed. | |
1527 | * | |
1528 | * The strategy routine may return | |
1529 | * | |
1530 | * < 0 - Error occurred (error is passed to user process) | |
1531 | * | |
1532 | * 0 - OK - proceed with automatic read or write. | |
1533 | * | |
1534 | * > 0 - OK - read or write has been done by the strategy routine, so | |
1535 | * return immediately. | |
1536 | * | |
1537 | * There must be a proc_handler routine for any terminal nodes | |
1538 | * mirrored under /proc/sys (non-terminals are handled by a built-in | |
1539 | * directory handler). Several default handlers are available to | |
1540 | * cover common cases - | |
1541 | * | |
1542 | * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(), | |
1543 | * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(), | |
1544 | * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax() | |
1545 | * | |
1546 | * It is the handler's job to read the input buffer from user memory | |
1547 | * and process it. The handler should return 0 on success. | |
1548 | * | |
1549 | * This routine returns %NULL on a failure to register, and a pointer | |
1550 | * to the table header on success. | |
1551 | */ | |
d8217f07 | 1552 | struct ctl_table_header *register_sysctl_table(struct ctl_table * table) |
1da177e4 LT |
1553 | { |
1554 | struct ctl_table_header *tmp; | |
1555 | tmp = kmalloc(sizeof(struct ctl_table_header), GFP_KERNEL); | |
1556 | if (!tmp) | |
1557 | return NULL; | |
1558 | tmp->ctl_table = table; | |
1559 | INIT_LIST_HEAD(&tmp->ctl_entry); | |
330d57fb AV |
1560 | tmp->used = 0; |
1561 | tmp->unregistering = NULL; | |
d912b0cc | 1562 | sysctl_set_parent(NULL, table); |
fc6cd25b EB |
1563 | if (sysctl_check_table(tmp->ctl_table)) { |
1564 | kfree(tmp); | |
1565 | return NULL; | |
1566 | } | |
330d57fb | 1567 | spin_lock(&sysctl_lock); |
0b4d4147 | 1568 | list_add_tail(&tmp->ctl_entry, &root_table_header.ctl_entry); |
330d57fb | 1569 | spin_unlock(&sysctl_lock); |
1da177e4 LT |
1570 | return tmp; |
1571 | } | |
1572 | ||
1573 | /** | |
1574 | * unregister_sysctl_table - unregister a sysctl table hierarchy | |
1575 | * @header: the header returned from register_sysctl_table | |
1576 | * | |
1577 | * Unregisters the sysctl table and all children. proc entries may not | |
1578 | * actually be removed until they are no longer used by anyone. | |
1579 | */ | |
1580 | void unregister_sysctl_table(struct ctl_table_header * header) | |
1581 | { | |
330d57fb AV |
1582 | might_sleep(); |
1583 | spin_lock(&sysctl_lock); | |
1584 | start_unregistering(header); | |
330d57fb | 1585 | spin_unlock(&sysctl_lock); |
1da177e4 LT |
1586 | kfree(header); |
1587 | } | |
1588 | ||
b89a8171 | 1589 | #else /* !CONFIG_SYSCTL */ |
d8217f07 | 1590 | struct ctl_table_header *register_sysctl_table(struct ctl_table * table) |
b89a8171 EB |
1591 | { |
1592 | return NULL; | |
1593 | } | |
1594 | ||
1595 | void unregister_sysctl_table(struct ctl_table_header * table) | |
1596 | { | |
1597 | } | |
1598 | ||
1599 | #endif /* CONFIG_SYSCTL */ | |
1600 | ||
1da177e4 LT |
1601 | /* |
1602 | * /proc/sys support | |
1603 | */ | |
1604 | ||
b89a8171 | 1605 | #ifdef CONFIG_PROC_SYSCTL |
1da177e4 | 1606 | |
b1ba4ddd AB |
1607 | static int _proc_do_string(void* data, int maxlen, int write, |
1608 | struct file *filp, void __user *buffer, | |
1609 | size_t *lenp, loff_t *ppos) | |
1da177e4 LT |
1610 | { |
1611 | size_t len; | |
1612 | char __user *p; | |
1613 | char c; | |
8d060877 ON |
1614 | |
1615 | if (!data || !maxlen || !*lenp) { | |
1da177e4 LT |
1616 | *lenp = 0; |
1617 | return 0; | |
1618 | } | |
8d060877 | 1619 | |
1da177e4 LT |
1620 | if (write) { |
1621 | len = 0; | |
1622 | p = buffer; | |
1623 | while (len < *lenp) { | |
1624 | if (get_user(c, p++)) | |
1625 | return -EFAULT; | |
1626 | if (c == 0 || c == '\n') | |
1627 | break; | |
1628 | len++; | |
1629 | } | |
f5dd3d6f SV |
1630 | if (len >= maxlen) |
1631 | len = maxlen-1; | |
1632 | if(copy_from_user(data, buffer, len)) | |
1da177e4 | 1633 | return -EFAULT; |
f5dd3d6f | 1634 | ((char *) data)[len] = 0; |
1da177e4 LT |
1635 | *ppos += *lenp; |
1636 | } else { | |
f5dd3d6f SV |
1637 | len = strlen(data); |
1638 | if (len > maxlen) | |
1639 | len = maxlen; | |
8d060877 ON |
1640 | |
1641 | if (*ppos > len) { | |
1642 | *lenp = 0; | |
1643 | return 0; | |
1644 | } | |
1645 | ||
1646 | data += *ppos; | |
1647 | len -= *ppos; | |
1648 | ||
1da177e4 LT |
1649 | if (len > *lenp) |
1650 | len = *lenp; | |
1651 | if (len) | |
f5dd3d6f | 1652 | if(copy_to_user(buffer, data, len)) |
1da177e4 LT |
1653 | return -EFAULT; |
1654 | if (len < *lenp) { | |
1655 | if(put_user('\n', ((char __user *) buffer) + len)) | |
1656 | return -EFAULT; | |
1657 | len++; | |
1658 | } | |
1659 | *lenp = len; | |
1660 | *ppos += len; | |
1661 | } | |
1662 | return 0; | |
1663 | } | |
1664 | ||
f5dd3d6f SV |
1665 | /** |
1666 | * proc_dostring - read a string sysctl | |
1667 | * @table: the sysctl table | |
1668 | * @write: %TRUE if this is a write to the sysctl file | |
1669 | * @filp: the file structure | |
1670 | * @buffer: the user buffer | |
1671 | * @lenp: the size of the user buffer | |
1672 | * @ppos: file position | |
1673 | * | |
1674 | * Reads/writes a string from/to the user buffer. If the kernel | |
1675 | * buffer provided is not large enough to hold the string, the | |
1676 | * string is truncated. The copied string is %NULL-terminated. | |
1677 | * If the string is being read by the user process, it is copied | |
1678 | * and a newline '\n' is added. It is truncated if the buffer is | |
1679 | * not large enough. | |
1680 | * | |
1681 | * Returns 0 on success. | |
1682 | */ | |
d8217f07 | 1683 | int proc_dostring(struct ctl_table *table, int write, struct file *filp, |
f5dd3d6f SV |
1684 | void __user *buffer, size_t *lenp, loff_t *ppos) |
1685 | { | |
1686 | return _proc_do_string(table->data, table->maxlen, write, filp, | |
1687 | buffer, lenp, ppos); | |
1688 | } | |
1689 | ||
1da177e4 LT |
1690 | |
1691 | static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp, | |
1692 | int *valp, | |
1693 | int write, void *data) | |
1694 | { | |
1695 | if (write) { | |
1696 | *valp = *negp ? -*lvalp : *lvalp; | |
1697 | } else { | |
1698 | int val = *valp; | |
1699 | if (val < 0) { | |
1700 | *negp = -1; | |
1701 | *lvalp = (unsigned long)-val; | |
1702 | } else { | |
1703 | *negp = 0; | |
1704 | *lvalp = (unsigned long)val; | |
1705 | } | |
1706 | } | |
1707 | return 0; | |
1708 | } | |
1709 | ||
d8217f07 | 1710 | static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table, |
fcfbd547 KK |
1711 | int write, struct file *filp, void __user *buffer, |
1712 | size_t *lenp, loff_t *ppos, | |
1da177e4 LT |
1713 | int (*conv)(int *negp, unsigned long *lvalp, int *valp, |
1714 | int write, void *data), | |
1715 | void *data) | |
1716 | { | |
1717 | #define TMPBUFLEN 21 | |
1718 | int *i, vleft, first=1, neg, val; | |
1719 | unsigned long lval; | |
1720 | size_t left, len; | |
1721 | ||
1722 | char buf[TMPBUFLEN], *p; | |
1723 | char __user *s = buffer; | |
1724 | ||
fcfbd547 | 1725 | if (!tbl_data || !table->maxlen || !*lenp || |
1da177e4 LT |
1726 | (*ppos && !write)) { |
1727 | *lenp = 0; | |
1728 | return 0; | |
1729 | } | |
1730 | ||
fcfbd547 | 1731 | i = (int *) tbl_data; |
1da177e4 LT |
1732 | vleft = table->maxlen / sizeof(*i); |
1733 | left = *lenp; | |
1734 | ||
1735 | if (!conv) | |
1736 | conv = do_proc_dointvec_conv; | |
1737 | ||
1738 | for (; left && vleft--; i++, first=0) { | |
1739 | if (write) { | |
1740 | while (left) { | |
1741 | char c; | |
1742 | if (get_user(c, s)) | |
1743 | return -EFAULT; | |
1744 | if (!isspace(c)) | |
1745 | break; | |
1746 | left--; | |
1747 | s++; | |
1748 | } | |
1749 | if (!left) | |
1750 | break; | |
1751 | neg = 0; | |
1752 | len = left; | |
1753 | if (len > sizeof(buf) - 1) | |
1754 | len = sizeof(buf) - 1; | |
1755 | if (copy_from_user(buf, s, len)) | |
1756 | return -EFAULT; | |
1757 | buf[len] = 0; | |
1758 | p = buf; | |
1759 | if (*p == '-' && left > 1) { | |
1760 | neg = 1; | |
bd9b0bac | 1761 | p++; |
1da177e4 LT |
1762 | } |
1763 | if (*p < '0' || *p > '9') | |
1764 | break; | |
1765 | ||
1766 | lval = simple_strtoul(p, &p, 0); | |
1767 | ||
1768 | len = p-buf; | |
1769 | if ((len < left) && *p && !isspace(*p)) | |
1770 | break; | |
1771 | if (neg) | |
1772 | val = -val; | |
1773 | s += len; | |
1774 | left -= len; | |
1775 | ||
1776 | if (conv(&neg, &lval, i, 1, data)) | |
1777 | break; | |
1778 | } else { | |
1779 | p = buf; | |
1780 | if (!first) | |
1781 | *p++ = '\t'; | |
1782 | ||
1783 | if (conv(&neg, &lval, i, 0, data)) | |
1784 | break; | |
1785 | ||
1786 | sprintf(p, "%s%lu", neg ? "-" : "", lval); | |
1787 | len = strlen(buf); | |
1788 | if (len > left) | |
1789 | len = left; | |
1790 | if(copy_to_user(s, buf, len)) | |
1791 | return -EFAULT; | |
1792 | left -= len; | |
1793 | s += len; | |
1794 | } | |
1795 | } | |
1796 | ||
1797 | if (!write && !first && left) { | |
1798 | if(put_user('\n', s)) | |
1799 | return -EFAULT; | |
1800 | left--, s++; | |
1801 | } | |
1802 | if (write) { | |
1803 | while (left) { | |
1804 | char c; | |
1805 | if (get_user(c, s++)) | |
1806 | return -EFAULT; | |
1807 | if (!isspace(c)) | |
1808 | break; | |
1809 | left--; | |
1810 | } | |
1811 | } | |
1812 | if (write && first) | |
1813 | return -EINVAL; | |
1814 | *lenp -= left; | |
1815 | *ppos += *lenp; | |
1816 | return 0; | |
1817 | #undef TMPBUFLEN | |
1818 | } | |
1819 | ||
d8217f07 | 1820 | static int do_proc_dointvec(struct ctl_table *table, int write, struct file *filp, |
fcfbd547 KK |
1821 | void __user *buffer, size_t *lenp, loff_t *ppos, |
1822 | int (*conv)(int *negp, unsigned long *lvalp, int *valp, | |
1823 | int write, void *data), | |
1824 | void *data) | |
1825 | { | |
1826 | return __do_proc_dointvec(table->data, table, write, filp, | |
1827 | buffer, lenp, ppos, conv, data); | |
1828 | } | |
1829 | ||
1da177e4 LT |
1830 | /** |
1831 | * proc_dointvec - read a vector of integers | |
1832 | * @table: the sysctl table | |
1833 | * @write: %TRUE if this is a write to the sysctl file | |
1834 | * @filp: the file structure | |
1835 | * @buffer: the user buffer | |
1836 | * @lenp: the size of the user buffer | |
1837 | * @ppos: file position | |
1838 | * | |
1839 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer | |
1840 | * values from/to the user buffer, treated as an ASCII string. | |
1841 | * | |
1842 | * Returns 0 on success. | |
1843 | */ | |
d8217f07 | 1844 | int proc_dointvec(struct ctl_table *table, int write, struct file *filp, |
1da177e4 LT |
1845 | void __user *buffer, size_t *lenp, loff_t *ppos) |
1846 | { | |
1847 | return do_proc_dointvec(table,write,filp,buffer,lenp,ppos, | |
1848 | NULL,NULL); | |
1849 | } | |
1850 | ||
1851 | #define OP_SET 0 | |
1852 | #define OP_AND 1 | |
34f5a398 | 1853 | #define OP_OR 2 |
1da177e4 LT |
1854 | |
1855 | static int do_proc_dointvec_bset_conv(int *negp, unsigned long *lvalp, | |
1856 | int *valp, | |
1857 | int write, void *data) | |
1858 | { | |
1859 | int op = *(int *)data; | |
1860 | if (write) { | |
1861 | int val = *negp ? -*lvalp : *lvalp; | |
1862 | switch(op) { | |
1863 | case OP_SET: *valp = val; break; | |
1864 | case OP_AND: *valp &= val; break; | |
34f5a398 | 1865 | case OP_OR: *valp |= val; break; |
1da177e4 LT |
1866 | } |
1867 | } else { | |
1868 | int val = *valp; | |
1869 | if (val < 0) { | |
1870 | *negp = -1; | |
1871 | *lvalp = (unsigned long)-val; | |
1872 | } else { | |
1873 | *negp = 0; | |
1874 | *lvalp = (unsigned long)val; | |
1875 | } | |
1876 | } | |
1877 | return 0; | |
1878 | } | |
1879 | ||
72c2d582 | 1880 | #ifdef CONFIG_SECURITY_CAPABILITIES |
1da177e4 LT |
1881 | /* |
1882 | * init may raise the set. | |
1883 | */ | |
72c2d582 | 1884 | |
d8217f07 | 1885 | int proc_dointvec_bset(struct ctl_table *table, int write, struct file *filp, |
1da177e4 LT |
1886 | void __user *buffer, size_t *lenp, loff_t *ppos) |
1887 | { | |
1888 | int op; | |
1889 | ||
6ff1b442 | 1890 | if (write && !capable(CAP_SYS_MODULE)) { |
1da177e4 LT |
1891 | return -EPERM; |
1892 | } | |
1893 | ||
b460cbc5 | 1894 | op = is_global_init(current) ? OP_SET : OP_AND; |
1da177e4 LT |
1895 | return do_proc_dointvec(table,write,filp,buffer,lenp,ppos, |
1896 | do_proc_dointvec_bset_conv,&op); | |
1897 | } | |
72c2d582 | 1898 | #endif /* def CONFIG_SECURITY_CAPABILITIES */ |
1da177e4 | 1899 | |
34f5a398 TT |
1900 | /* |
1901 | * Taint values can only be increased | |
1902 | */ | |
d8217f07 | 1903 | static int proc_dointvec_taint(struct ctl_table *table, int write, struct file *filp, |
34f5a398 TT |
1904 | void __user *buffer, size_t *lenp, loff_t *ppos) |
1905 | { | |
1906 | int op; | |
1907 | ||
91fcd412 | 1908 | if (write && !capable(CAP_SYS_ADMIN)) |
34f5a398 TT |
1909 | return -EPERM; |
1910 | ||
1911 | op = OP_OR; | |
1912 | return do_proc_dointvec(table,write,filp,buffer,lenp,ppos, | |
1913 | do_proc_dointvec_bset_conv,&op); | |
1914 | } | |
1915 | ||
1da177e4 LT |
1916 | struct do_proc_dointvec_minmax_conv_param { |
1917 | int *min; | |
1918 | int *max; | |
1919 | }; | |
1920 | ||
1921 | static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp, | |
1922 | int *valp, | |
1923 | int write, void *data) | |
1924 | { | |
1925 | struct do_proc_dointvec_minmax_conv_param *param = data; | |
1926 | if (write) { | |
1927 | int val = *negp ? -*lvalp : *lvalp; | |
1928 | if ((param->min && *param->min > val) || | |
1929 | (param->max && *param->max < val)) | |
1930 | return -EINVAL; | |
1931 | *valp = val; | |
1932 | } else { | |
1933 | int val = *valp; | |
1934 | if (val < 0) { | |
1935 | *negp = -1; | |
1936 | *lvalp = (unsigned long)-val; | |
1937 | } else { | |
1938 | *negp = 0; | |
1939 | *lvalp = (unsigned long)val; | |
1940 | } | |
1941 | } | |
1942 | return 0; | |
1943 | } | |
1944 | ||
1945 | /** | |
1946 | * proc_dointvec_minmax - read a vector of integers with min/max values | |
1947 | * @table: the sysctl table | |
1948 | * @write: %TRUE if this is a write to the sysctl file | |
1949 | * @filp: the file structure | |
1950 | * @buffer: the user buffer | |
1951 | * @lenp: the size of the user buffer | |
1952 | * @ppos: file position | |
1953 | * | |
1954 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer | |
1955 | * values from/to the user buffer, treated as an ASCII string. | |
1956 | * | |
1957 | * This routine will ensure the values are within the range specified by | |
1958 | * table->extra1 (min) and table->extra2 (max). | |
1959 | * | |
1960 | * Returns 0 on success. | |
1961 | */ | |
d8217f07 | 1962 | int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp, |
1da177e4 LT |
1963 | void __user *buffer, size_t *lenp, loff_t *ppos) |
1964 | { | |
1965 | struct do_proc_dointvec_minmax_conv_param param = { | |
1966 | .min = (int *) table->extra1, | |
1967 | .max = (int *) table->extra2, | |
1968 | }; | |
1969 | return do_proc_dointvec(table, write, filp, buffer, lenp, ppos, | |
1970 | do_proc_dointvec_minmax_conv, ¶m); | |
1971 | } | |
1972 | ||
d8217f07 | 1973 | static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write, |
1da177e4 LT |
1974 | struct file *filp, |
1975 | void __user *buffer, | |
1976 | size_t *lenp, loff_t *ppos, | |
1977 | unsigned long convmul, | |
1978 | unsigned long convdiv) | |
1979 | { | |
1980 | #define TMPBUFLEN 21 | |
1981 | unsigned long *i, *min, *max, val; | |
1982 | int vleft, first=1, neg; | |
1983 | size_t len, left; | |
1984 | char buf[TMPBUFLEN], *p; | |
1985 | char __user *s = buffer; | |
1986 | ||
fcfbd547 | 1987 | if (!data || !table->maxlen || !*lenp || |
1da177e4 LT |
1988 | (*ppos && !write)) { |
1989 | *lenp = 0; | |
1990 | return 0; | |
1991 | } | |
1992 | ||
fcfbd547 | 1993 | i = (unsigned long *) data; |
1da177e4 LT |
1994 | min = (unsigned long *) table->extra1; |
1995 | max = (unsigned long *) table->extra2; | |
1996 | vleft = table->maxlen / sizeof(unsigned long); | |
1997 | left = *lenp; | |
1998 | ||
1999 | for (; left && vleft--; i++, min++, max++, first=0) { | |
2000 | if (write) { | |
2001 | while (left) { | |
2002 | char c; | |
2003 | if (get_user(c, s)) | |
2004 | return -EFAULT; | |
2005 | if (!isspace(c)) | |
2006 | break; | |
2007 | left--; | |
2008 | s++; | |
2009 | } | |
2010 | if (!left) | |
2011 | break; | |
2012 | neg = 0; | |
2013 | len = left; | |
2014 | if (len > TMPBUFLEN-1) | |
2015 | len = TMPBUFLEN-1; | |
2016 | if (copy_from_user(buf, s, len)) | |
2017 | return -EFAULT; | |
2018 | buf[len] = 0; | |
2019 | p = buf; | |
2020 | if (*p == '-' && left > 1) { | |
2021 | neg = 1; | |
bd9b0bac | 2022 | p++; |
1da177e4 LT |
2023 | } |
2024 | if (*p < '0' || *p > '9') | |
2025 | break; | |
2026 | val = simple_strtoul(p, &p, 0) * convmul / convdiv ; | |
2027 | len = p-buf; | |
2028 | if ((len < left) && *p && !isspace(*p)) | |
2029 | break; | |
2030 | if (neg) | |
2031 | val = -val; | |
2032 | s += len; | |
2033 | left -= len; | |
2034 | ||
2035 | if(neg) | |
2036 | continue; | |
2037 | if ((min && val < *min) || (max && val > *max)) | |
2038 | continue; | |
2039 | *i = val; | |
2040 | } else { | |
2041 | p = buf; | |
2042 | if (!first) | |
2043 | *p++ = '\t'; | |
2044 | sprintf(p, "%lu", convdiv * (*i) / convmul); | |
2045 | len = strlen(buf); | |
2046 | if (len > left) | |
2047 | len = left; | |
2048 | if(copy_to_user(s, buf, len)) | |
2049 | return -EFAULT; | |
2050 | left -= len; | |
2051 | s += len; | |
2052 | } | |
2053 | } | |
2054 | ||
2055 | if (!write && !first && left) { | |
2056 | if(put_user('\n', s)) | |
2057 | return -EFAULT; | |
2058 | left--, s++; | |
2059 | } | |
2060 | if (write) { | |
2061 | while (left) { | |
2062 | char c; | |
2063 | if (get_user(c, s++)) | |
2064 | return -EFAULT; | |
2065 | if (!isspace(c)) | |
2066 | break; | |
2067 | left--; | |
2068 | } | |
2069 | } | |
2070 | if (write && first) | |
2071 | return -EINVAL; | |
2072 | *lenp -= left; | |
2073 | *ppos += *lenp; | |
2074 | return 0; | |
2075 | #undef TMPBUFLEN | |
2076 | } | |
2077 | ||
d8217f07 | 2078 | static int do_proc_doulongvec_minmax(struct ctl_table *table, int write, |
fcfbd547 KK |
2079 | struct file *filp, |
2080 | void __user *buffer, | |
2081 | size_t *lenp, loff_t *ppos, | |
2082 | unsigned long convmul, | |
2083 | unsigned long convdiv) | |
2084 | { | |
2085 | return __do_proc_doulongvec_minmax(table->data, table, write, | |
2086 | filp, buffer, lenp, ppos, convmul, convdiv); | |
2087 | } | |
2088 | ||
1da177e4 LT |
2089 | /** |
2090 | * proc_doulongvec_minmax - read a vector of long integers with min/max values | |
2091 | * @table: the sysctl table | |
2092 | * @write: %TRUE if this is a write to the sysctl file | |
2093 | * @filp: the file structure | |
2094 | * @buffer: the user buffer | |
2095 | * @lenp: the size of the user buffer | |
2096 | * @ppos: file position | |
2097 | * | |
2098 | * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long | |
2099 | * values from/to the user buffer, treated as an ASCII string. | |
2100 | * | |
2101 | * This routine will ensure the values are within the range specified by | |
2102 | * table->extra1 (min) and table->extra2 (max). | |
2103 | * | |
2104 | * Returns 0 on success. | |
2105 | */ | |
d8217f07 | 2106 | int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp, |
1da177e4 LT |
2107 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2108 | { | |
2109 | return do_proc_doulongvec_minmax(table, write, filp, buffer, lenp, ppos, 1l, 1l); | |
2110 | } | |
2111 | ||
2112 | /** | |
2113 | * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values | |
2114 | * @table: the sysctl table | |
2115 | * @write: %TRUE if this is a write to the sysctl file | |
2116 | * @filp: the file structure | |
2117 | * @buffer: the user buffer | |
2118 | * @lenp: the size of the user buffer | |
2119 | * @ppos: file position | |
2120 | * | |
2121 | * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long | |
2122 | * values from/to the user buffer, treated as an ASCII string. The values | |
2123 | * are treated as milliseconds, and converted to jiffies when they are stored. | |
2124 | * | |
2125 | * This routine will ensure the values are within the range specified by | |
2126 | * table->extra1 (min) and table->extra2 (max). | |
2127 | * | |
2128 | * Returns 0 on success. | |
2129 | */ | |
d8217f07 | 2130 | int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, |
1da177e4 LT |
2131 | struct file *filp, |
2132 | void __user *buffer, | |
2133 | size_t *lenp, loff_t *ppos) | |
2134 | { | |
2135 | return do_proc_doulongvec_minmax(table, write, filp, buffer, | |
2136 | lenp, ppos, HZ, 1000l); | |
2137 | } | |
2138 | ||
2139 | ||
2140 | static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp, | |
2141 | int *valp, | |
2142 | int write, void *data) | |
2143 | { | |
2144 | if (write) { | |
cba9f33d BS |
2145 | if (*lvalp > LONG_MAX / HZ) |
2146 | return 1; | |
1da177e4 LT |
2147 | *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ); |
2148 | } else { | |
2149 | int val = *valp; | |
2150 | unsigned long lval; | |
2151 | if (val < 0) { | |
2152 | *negp = -1; | |
2153 | lval = (unsigned long)-val; | |
2154 | } else { | |
2155 | *negp = 0; | |
2156 | lval = (unsigned long)val; | |
2157 | } | |
2158 | *lvalp = lval / HZ; | |
2159 | } | |
2160 | return 0; | |
2161 | } | |
2162 | ||
2163 | static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp, | |
2164 | int *valp, | |
2165 | int write, void *data) | |
2166 | { | |
2167 | if (write) { | |
cba9f33d BS |
2168 | if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ) |
2169 | return 1; | |
1da177e4 LT |
2170 | *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp); |
2171 | } else { | |
2172 | int val = *valp; | |
2173 | unsigned long lval; | |
2174 | if (val < 0) { | |
2175 | *negp = -1; | |
2176 | lval = (unsigned long)-val; | |
2177 | } else { | |
2178 | *negp = 0; | |
2179 | lval = (unsigned long)val; | |
2180 | } | |
2181 | *lvalp = jiffies_to_clock_t(lval); | |
2182 | } | |
2183 | return 0; | |
2184 | } | |
2185 | ||
2186 | static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp, | |
2187 | int *valp, | |
2188 | int write, void *data) | |
2189 | { | |
2190 | if (write) { | |
2191 | *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp); | |
2192 | } else { | |
2193 | int val = *valp; | |
2194 | unsigned long lval; | |
2195 | if (val < 0) { | |
2196 | *negp = -1; | |
2197 | lval = (unsigned long)-val; | |
2198 | } else { | |
2199 | *negp = 0; | |
2200 | lval = (unsigned long)val; | |
2201 | } | |
2202 | *lvalp = jiffies_to_msecs(lval); | |
2203 | } | |
2204 | return 0; | |
2205 | } | |
2206 | ||
2207 | /** | |
2208 | * proc_dointvec_jiffies - read a vector of integers as seconds | |
2209 | * @table: the sysctl table | |
2210 | * @write: %TRUE if this is a write to the sysctl file | |
2211 | * @filp: the file structure | |
2212 | * @buffer: the user buffer | |
2213 | * @lenp: the size of the user buffer | |
2214 | * @ppos: file position | |
2215 | * | |
2216 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer | |
2217 | * values from/to the user buffer, treated as an ASCII string. | |
2218 | * The values read are assumed to be in seconds, and are converted into | |
2219 | * jiffies. | |
2220 | * | |
2221 | * Returns 0 on success. | |
2222 | */ | |
d8217f07 | 2223 | int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp, |
1da177e4 LT |
2224 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2225 | { | |
2226 | return do_proc_dointvec(table,write,filp,buffer,lenp,ppos, | |
2227 | do_proc_dointvec_jiffies_conv,NULL); | |
2228 | } | |
2229 | ||
2230 | /** | |
2231 | * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds | |
2232 | * @table: the sysctl table | |
2233 | * @write: %TRUE if this is a write to the sysctl file | |
2234 | * @filp: the file structure | |
2235 | * @buffer: the user buffer | |
2236 | * @lenp: the size of the user buffer | |
1e5d5331 | 2237 | * @ppos: pointer to the file position |
1da177e4 LT |
2238 | * |
2239 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer | |
2240 | * values from/to the user buffer, treated as an ASCII string. | |
2241 | * The values read are assumed to be in 1/USER_HZ seconds, and | |
2242 | * are converted into jiffies. | |
2243 | * | |
2244 | * Returns 0 on success. | |
2245 | */ | |
d8217f07 | 2246 | int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp, |
1da177e4 LT |
2247 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2248 | { | |
2249 | return do_proc_dointvec(table,write,filp,buffer,lenp,ppos, | |
2250 | do_proc_dointvec_userhz_jiffies_conv,NULL); | |
2251 | } | |
2252 | ||
2253 | /** | |
2254 | * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds | |
2255 | * @table: the sysctl table | |
2256 | * @write: %TRUE if this is a write to the sysctl file | |
2257 | * @filp: the file structure | |
2258 | * @buffer: the user buffer | |
2259 | * @lenp: the size of the user buffer | |
67be2dd1 MW |
2260 | * @ppos: file position |
2261 | * @ppos: the current position in the file | |
1da177e4 LT |
2262 | * |
2263 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer | |
2264 | * values from/to the user buffer, treated as an ASCII string. | |
2265 | * The values read are assumed to be in 1/1000 seconds, and | |
2266 | * are converted into jiffies. | |
2267 | * | |
2268 | * Returns 0 on success. | |
2269 | */ | |
d8217f07 | 2270 | int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp, |
1da177e4 LT |
2271 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2272 | { | |
2273 | return do_proc_dointvec(table, write, filp, buffer, lenp, ppos, | |
2274 | do_proc_dointvec_ms_jiffies_conv, NULL); | |
2275 | } | |
2276 | ||
d8217f07 | 2277 | static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp, |
9ec52099 CLG |
2278 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2279 | { | |
2280 | struct pid *new_pid; | |
2281 | pid_t tmp; | |
2282 | int r; | |
2283 | ||
b488893a | 2284 | tmp = pid_nr_ns(cad_pid, current->nsproxy->pid_ns); |
9ec52099 CLG |
2285 | |
2286 | r = __do_proc_dointvec(&tmp, table, write, filp, buffer, | |
2287 | lenp, ppos, NULL, NULL); | |
2288 | if (r || !write) | |
2289 | return r; | |
2290 | ||
2291 | new_pid = find_get_pid(tmp); | |
2292 | if (!new_pid) | |
2293 | return -ESRCH; | |
2294 | ||
2295 | put_pid(xchg(&cad_pid, new_pid)); | |
2296 | return 0; | |
2297 | } | |
2298 | ||
1da177e4 LT |
2299 | #else /* CONFIG_PROC_FS */ |
2300 | ||
d8217f07 | 2301 | int proc_dostring(struct ctl_table *table, int write, struct file *filp, |
1da177e4 LT |
2302 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2303 | { | |
2304 | return -ENOSYS; | |
2305 | } | |
2306 | ||
d8217f07 | 2307 | int proc_dointvec(struct ctl_table *table, int write, struct file *filp, |
1da177e4 LT |
2308 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2309 | { | |
2310 | return -ENOSYS; | |
2311 | } | |
2312 | ||
d8217f07 | 2313 | int proc_dointvec_bset(struct ctl_table *table, int write, struct file *filp, |
1da177e4 LT |
2314 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2315 | { | |
2316 | return -ENOSYS; | |
2317 | } | |
2318 | ||
d8217f07 | 2319 | int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp, |
1da177e4 LT |
2320 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2321 | { | |
2322 | return -ENOSYS; | |
2323 | } | |
2324 | ||
d8217f07 | 2325 | int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp, |
1da177e4 LT |
2326 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2327 | { | |
2328 | return -ENOSYS; | |
2329 | } | |
2330 | ||
d8217f07 | 2331 | int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp, |
1da177e4 LT |
2332 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2333 | { | |
2334 | return -ENOSYS; | |
2335 | } | |
2336 | ||
d8217f07 | 2337 | int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp, |
1da177e4 LT |
2338 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2339 | { | |
2340 | return -ENOSYS; | |
2341 | } | |
2342 | ||
d8217f07 | 2343 | int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp, |
1da177e4 LT |
2344 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2345 | { | |
2346 | return -ENOSYS; | |
2347 | } | |
2348 | ||
d8217f07 | 2349 | int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, |
1da177e4 LT |
2350 | struct file *filp, |
2351 | void __user *buffer, | |
2352 | size_t *lenp, loff_t *ppos) | |
2353 | { | |
2354 | return -ENOSYS; | |
2355 | } | |
2356 | ||
2357 | ||
2358 | #endif /* CONFIG_PROC_FS */ | |
2359 | ||
2360 | ||
b89a8171 | 2361 | #ifdef CONFIG_SYSCTL_SYSCALL |
1da177e4 LT |
2362 | /* |
2363 | * General sysctl support routines | |
2364 | */ | |
2365 | ||
49a0c458 EB |
2366 | /* The generic sysctl data routine (used if no strategy routine supplied) */ |
2367 | int sysctl_data(struct ctl_table *table, int __user *name, int nlen, | |
2368 | void __user *oldval, size_t __user *oldlenp, | |
2369 | void __user *newval, size_t newlen) | |
2370 | { | |
2371 | size_t len; | |
2372 | ||
2373 | /* Get out of I don't have a variable */ | |
2374 | if (!table->data || !table->maxlen) | |
2375 | return -ENOTDIR; | |
2376 | ||
2377 | if (oldval && oldlenp) { | |
2378 | if (get_user(len, oldlenp)) | |
2379 | return -EFAULT; | |
2380 | if (len) { | |
2381 | if (len > table->maxlen) | |
2382 | len = table->maxlen; | |
2383 | if (copy_to_user(oldval, table->data, len)) | |
2384 | return -EFAULT; | |
2385 | if (put_user(len, oldlenp)) | |
2386 | return -EFAULT; | |
2387 | } | |
2388 | } | |
2389 | ||
2390 | if (newval && newlen) { | |
2391 | if (newlen > table->maxlen) | |
2392 | newlen = table->maxlen; | |
2393 | ||
2394 | if (copy_from_user(table->data, newval, newlen)) | |
2395 | return -EFAULT; | |
2396 | } | |
2397 | return 1; | |
2398 | } | |
2399 | ||
1da177e4 | 2400 | /* The generic string strategy routine: */ |
d8217f07 | 2401 | int sysctl_string(struct ctl_table *table, int __user *name, int nlen, |
1da177e4 | 2402 | void __user *oldval, size_t __user *oldlenp, |
1f29bcd7 | 2403 | void __user *newval, size_t newlen) |
1da177e4 | 2404 | { |
1da177e4 LT |
2405 | if (!table->data || !table->maxlen) |
2406 | return -ENOTDIR; | |
2407 | ||
2408 | if (oldval && oldlenp) { | |
de9e007d LT |
2409 | size_t bufsize; |
2410 | if (get_user(bufsize, oldlenp)) | |
1da177e4 | 2411 | return -EFAULT; |
de9e007d LT |
2412 | if (bufsize) { |
2413 | size_t len = strlen(table->data), copied; | |
2414 | ||
2415 | /* This shouldn't trigger for a well-formed sysctl */ | |
2416 | if (len > table->maxlen) | |
1da177e4 | 2417 | len = table->maxlen; |
de9e007d LT |
2418 | |
2419 | /* Copy up to a max of bufsize-1 bytes of the string */ | |
2420 | copied = (len >= bufsize) ? bufsize - 1 : len; | |
2421 | ||
2422 | if (copy_to_user(oldval, table->data, copied) || | |
2423 | put_user(0, (char __user *)(oldval + copied))) | |
1da177e4 | 2424 | return -EFAULT; |
de9e007d | 2425 | if (put_user(len, oldlenp)) |
1da177e4 LT |
2426 | return -EFAULT; |
2427 | } | |
2428 | } | |
2429 | if (newval && newlen) { | |
de9e007d | 2430 | size_t len = newlen; |
1da177e4 LT |
2431 | if (len > table->maxlen) |
2432 | len = table->maxlen; | |
2433 | if(copy_from_user(table->data, newval, len)) | |
2434 | return -EFAULT; | |
2435 | if (len == table->maxlen) | |
2436 | len--; | |
2437 | ((char *) table->data)[len] = 0; | |
2438 | } | |
82c9df82 | 2439 | return 1; |
1da177e4 LT |
2440 | } |
2441 | ||
2442 | /* | |
2443 | * This function makes sure that all of the integers in the vector | |
2444 | * are between the minimum and maximum values given in the arrays | |
2445 | * table->extra1 and table->extra2, respectively. | |
2446 | */ | |
d8217f07 | 2447 | int sysctl_intvec(struct ctl_table *table, int __user *name, int nlen, |
1da177e4 | 2448 | void __user *oldval, size_t __user *oldlenp, |
1f29bcd7 | 2449 | void __user *newval, size_t newlen) |
1da177e4 LT |
2450 | { |
2451 | ||
2452 | if (newval && newlen) { | |
2453 | int __user *vec = (int __user *) newval; | |
2454 | int *min = (int *) table->extra1; | |
2455 | int *max = (int *) table->extra2; | |
2456 | size_t length; | |
2457 | int i; | |
2458 | ||
2459 | if (newlen % sizeof(int) != 0) | |
2460 | return -EINVAL; | |
2461 | ||
2462 | if (!table->extra1 && !table->extra2) | |
2463 | return 0; | |
2464 | ||
2465 | if (newlen > table->maxlen) | |
2466 | newlen = table->maxlen; | |
2467 | length = newlen / sizeof(int); | |
2468 | ||
2469 | for (i = 0; i < length; i++) { | |
2470 | int value; | |
2471 | if (get_user(value, vec + i)) | |
2472 | return -EFAULT; | |
2473 | if (min && value < min[i]) | |
2474 | return -EINVAL; | |
2475 | if (max && value > max[i]) | |
2476 | return -EINVAL; | |
2477 | } | |
2478 | } | |
2479 | return 0; | |
2480 | } | |
2481 | ||
2482 | /* Strategy function to convert jiffies to seconds */ | |
d8217f07 | 2483 | int sysctl_jiffies(struct ctl_table *table, int __user *name, int nlen, |
1da177e4 | 2484 | void __user *oldval, size_t __user *oldlenp, |
1f29bcd7 | 2485 | void __user *newval, size_t newlen) |
1da177e4 | 2486 | { |
3ee75ac3 | 2487 | if (oldval && oldlenp) { |
1da177e4 | 2488 | size_t olen; |
3ee75ac3 AD |
2489 | |
2490 | if (get_user(olen, oldlenp)) | |
2491 | return -EFAULT; | |
2492 | if (olen) { | |
2493 | int val; | |
2494 | ||
2495 | if (olen < sizeof(int)) | |
2496 | return -EINVAL; | |
2497 | ||
2498 | val = *(int *)(table->data) / HZ; | |
2499 | if (put_user(val, (int __user *)oldval)) | |
2500 | return -EFAULT; | |
2501 | if (put_user(sizeof(int), oldlenp)) | |
1da177e4 | 2502 | return -EFAULT; |
1da177e4 | 2503 | } |
1da177e4 LT |
2504 | } |
2505 | if (newval && newlen) { | |
2506 | int new; | |
2507 | if (newlen != sizeof(int)) | |
2508 | return -EINVAL; | |
2509 | if (get_user(new, (int __user *)newval)) | |
2510 | return -EFAULT; | |
2511 | *(int *)(table->data) = new*HZ; | |
2512 | } | |
2513 | return 1; | |
2514 | } | |
2515 | ||
2516 | /* Strategy function to convert jiffies to seconds */ | |
d8217f07 | 2517 | int sysctl_ms_jiffies(struct ctl_table *table, int __user *name, int nlen, |
1da177e4 | 2518 | void __user *oldval, size_t __user *oldlenp, |
1f29bcd7 | 2519 | void __user *newval, size_t newlen) |
1da177e4 | 2520 | { |
3ee75ac3 | 2521 | if (oldval && oldlenp) { |
1da177e4 | 2522 | size_t olen; |
3ee75ac3 AD |
2523 | |
2524 | if (get_user(olen, oldlenp)) | |
2525 | return -EFAULT; | |
2526 | if (olen) { | |
2527 | int val; | |
2528 | ||
2529 | if (olen < sizeof(int)) | |
2530 | return -EINVAL; | |
2531 | ||
2532 | val = jiffies_to_msecs(*(int *)(table->data)); | |
2533 | if (put_user(val, (int __user *)oldval)) | |
2534 | return -EFAULT; | |
2535 | if (put_user(sizeof(int), oldlenp)) | |
1da177e4 | 2536 | return -EFAULT; |
1da177e4 | 2537 | } |
1da177e4 LT |
2538 | } |
2539 | if (newval && newlen) { | |
2540 | int new; | |
2541 | if (newlen != sizeof(int)) | |
2542 | return -EINVAL; | |
2543 | if (get_user(new, (int __user *)newval)) | |
2544 | return -EFAULT; | |
2545 | *(int *)(table->data) = msecs_to_jiffies(new); | |
2546 | } | |
2547 | return 1; | |
2548 | } | |
2549 | ||
c4b8b769 | 2550 | |
c4b8b769 | 2551 | |
b89a8171 | 2552 | #else /* CONFIG_SYSCTL_SYSCALL */ |
1da177e4 LT |
2553 | |
2554 | ||
2555 | asmlinkage long sys_sysctl(struct __sysctl_args __user *args) | |
2556 | { | |
0e009be8 | 2557 | struct __sysctl_args tmp; |
7058cb02 | 2558 | int error; |
0e009be8 | 2559 | |
0e009be8 EB |
2560 | if (copy_from_user(&tmp, args, sizeof(tmp))) |
2561 | return -EFAULT; | |
0e009be8 | 2562 | |
7058cb02 | 2563 | error = deprecated_sysctl_warning(&tmp); |
b89a8171 | 2564 | |
7058cb02 EB |
2565 | /* If no error reading the parameters then just -ENOSYS ... */ |
2566 | if (!error) | |
2567 | error = -ENOSYS; | |
2568 | ||
2569 | return error; | |
1da177e4 LT |
2570 | } |
2571 | ||
49a0c458 EB |
2572 | int sysctl_data(struct ctl_table *table, int __user *name, int nlen, |
2573 | void __user *oldval, size_t __user *oldlenp, | |
2574 | void __user *newval, size_t newlen) | |
2575 | { | |
2576 | return -ENOSYS; | |
2577 | } | |
2578 | ||
d8217f07 | 2579 | int sysctl_string(struct ctl_table *table, int __user *name, int nlen, |
1da177e4 | 2580 | void __user *oldval, size_t __user *oldlenp, |
1f29bcd7 | 2581 | void __user *newval, size_t newlen) |
1da177e4 LT |
2582 | { |
2583 | return -ENOSYS; | |
2584 | } | |
2585 | ||
d8217f07 | 2586 | int sysctl_intvec(struct ctl_table *table, int __user *name, int nlen, |
1da177e4 | 2587 | void __user *oldval, size_t __user *oldlenp, |
1f29bcd7 | 2588 | void __user *newval, size_t newlen) |
1da177e4 LT |
2589 | { |
2590 | return -ENOSYS; | |
2591 | } | |
2592 | ||
d8217f07 | 2593 | int sysctl_jiffies(struct ctl_table *table, int __user *name, int nlen, |
1da177e4 | 2594 | void __user *oldval, size_t __user *oldlenp, |
1f29bcd7 | 2595 | void __user *newval, size_t newlen) |
1da177e4 LT |
2596 | { |
2597 | return -ENOSYS; | |
2598 | } | |
2599 | ||
d8217f07 | 2600 | int sysctl_ms_jiffies(struct ctl_table *table, int __user *name, int nlen, |
1da177e4 | 2601 | void __user *oldval, size_t __user *oldlenp, |
1f29bcd7 | 2602 | void __user *newval, size_t newlen) |
1da177e4 LT |
2603 | { |
2604 | return -ENOSYS; | |
2605 | } | |
2606 | ||
b89a8171 | 2607 | #endif /* CONFIG_SYSCTL_SYSCALL */ |
1da177e4 | 2608 | |
7058cb02 EB |
2609 | static int deprecated_sysctl_warning(struct __sysctl_args *args) |
2610 | { | |
2611 | static int msg_count; | |
2612 | int name[CTL_MAXNAME]; | |
2613 | int i; | |
2614 | ||
2615 | /* Read in the sysctl name for better debug message logging */ | |
2616 | for (i = 0; i < args->nlen; i++) | |
2617 | if (get_user(name[i], args->name + i)) | |
2618 | return -EFAULT; | |
2619 | ||
2620 | /* Ignore accesses to kernel.version */ | |
2621 | if ((args->nlen == 2) && (name[0] == CTL_KERN) && (name[1] == KERN_VERSION)) | |
2622 | return 0; | |
2623 | ||
2624 | if (msg_count < 5) { | |
2625 | msg_count++; | |
2626 | printk(KERN_INFO | |
2627 | "warning: process `%s' used the deprecated sysctl " | |
2628 | "system call with ", current->comm); | |
2629 | for (i = 0; i < args->nlen; i++) | |
2630 | printk("%d.", name[i]); | |
2631 | printk("\n"); | |
2632 | } | |
2633 | return 0; | |
2634 | } | |
2635 | ||
1da177e4 LT |
2636 | /* |
2637 | * No sense putting this after each symbol definition, twice, | |
2638 | * exception granted :-) | |
2639 | */ | |
2640 | EXPORT_SYMBOL(proc_dointvec); | |
2641 | EXPORT_SYMBOL(proc_dointvec_jiffies); | |
2642 | EXPORT_SYMBOL(proc_dointvec_minmax); | |
2643 | EXPORT_SYMBOL(proc_dointvec_userhz_jiffies); | |
2644 | EXPORT_SYMBOL(proc_dointvec_ms_jiffies); | |
2645 | EXPORT_SYMBOL(proc_dostring); | |
2646 | EXPORT_SYMBOL(proc_doulongvec_minmax); | |
2647 | EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax); | |
2648 | EXPORT_SYMBOL(register_sysctl_table); | |
2649 | EXPORT_SYMBOL(sysctl_intvec); | |
2650 | EXPORT_SYMBOL(sysctl_jiffies); | |
2651 | EXPORT_SYMBOL(sysctl_ms_jiffies); | |
2652 | EXPORT_SYMBOL(sysctl_string); | |
49a0c458 | 2653 | EXPORT_SYMBOL(sysctl_data); |
1da177e4 | 2654 | EXPORT_SYMBOL(unregister_sysctl_table); |