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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> | |
c59ede7b | 27 | #include <linux/capability.h> |
1da177e4 LT |
28 | #include <linux/ctype.h> |
29 | #include <linux/utsname.h> | |
30 | #include <linux/capability.h> | |
31 | #include <linux/smp_lock.h> | |
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> | |
1da177e4 LT |
48 | |
49 | #include <asm/uaccess.h> | |
50 | #include <asm/processor.h> | |
51 | ||
529bf6be DS |
52 | extern int proc_nr_files(ctl_table *table, int write, struct file *filp, |
53 | void __user *buffer, size_t *lenp, loff_t *ppos); | |
54 | ||
1da177e4 LT |
55 | #if defined(CONFIG_SYSCTL) |
56 | ||
57 | /* External variables not in a header file. */ | |
58 | extern int C_A_D; | |
59 | extern int sysctl_overcommit_memory; | |
60 | extern int sysctl_overcommit_ratio; | |
fadd8fbd | 61 | extern int sysctl_panic_on_oom; |
1da177e4 LT |
62 | extern int max_threads; |
63 | extern int sysrq_enabled; | |
64 | extern int core_uses_pid; | |
d6e71144 | 65 | extern int suid_dumpable; |
1da177e4 LT |
66 | extern char core_pattern[]; |
67 | extern int cad_pid; | |
68 | extern int pid_max; | |
69 | extern int min_free_kbytes; | |
70 | extern int printk_ratelimit_jiffies; | |
71 | extern int printk_ratelimit_burst; | |
72 | extern int pid_max_min, pid_max_max; | |
9d0243bc | 73 | extern int sysctl_drop_caches; |
8ad4b1fb | 74 | extern int percpu_pagelist_fraction; |
bebfa101 | 75 | extern int compat_log; |
1da177e4 LT |
76 | |
77 | #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86) | |
78 | int unknown_nmi_panic; | |
407984f1 DZ |
79 | int nmi_watchdog_enabled; |
80 | extern int proc_nmi_enabled(struct ctl_table *, int , struct file *, | |
81 | void __user *, size_t *, loff_t *); | |
1da177e4 LT |
82 | #endif |
83 | ||
84 | /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */ | |
85 | static int maxolduid = 65535; | |
86 | static int minolduid; | |
8ad4b1fb | 87 | static int min_percpu_pagelist_fract = 8; |
1da177e4 LT |
88 | |
89 | static int ngroups_max = NGROUPS_MAX; | |
90 | ||
91 | #ifdef CONFIG_KMOD | |
92 | extern char modprobe_path[]; | |
93 | #endif | |
1da177e4 LT |
94 | #ifdef CONFIG_CHR_DEV_SG |
95 | extern int sg_big_buff; | |
96 | #endif | |
97 | #ifdef CONFIG_SYSVIPC | |
98 | extern size_t shm_ctlmax; | |
99 | extern size_t shm_ctlall; | |
100 | extern int shm_ctlmni; | |
101 | extern int msg_ctlmax; | |
102 | extern int msg_ctlmnb; | |
103 | extern int msg_ctlmni; | |
104 | extern int sem_ctls[]; | |
105 | #endif | |
106 | ||
107 | #ifdef __sparc__ | |
108 | extern char reboot_command []; | |
109 | extern int stop_a_enabled; | |
110 | extern int scons_pwroff; | |
111 | #endif | |
112 | ||
113 | #ifdef __hppa__ | |
114 | extern int pwrsw_enabled; | |
115 | extern int unaligned_enabled; | |
116 | #endif | |
117 | ||
347a8dc3 | 118 | #ifdef CONFIG_S390 |
1da177e4 LT |
119 | #ifdef CONFIG_MATHEMU |
120 | extern int sysctl_ieee_emulation_warnings; | |
121 | #endif | |
122 | extern int sysctl_userprocess_debug; | |
951f22d5 | 123 | extern int spin_retry; |
1da177e4 LT |
124 | #endif |
125 | ||
126 | extern int sysctl_hz_timer; | |
127 | ||
128 | #ifdef CONFIG_BSD_PROCESS_ACCT | |
129 | extern int acct_parm[]; | |
130 | #endif | |
131 | ||
d2b176ed JS |
132 | #ifdef CONFIG_IA64 |
133 | extern int no_unaligned_warning; | |
134 | #endif | |
135 | ||
23f78d4a IM |
136 | #ifdef CONFIG_RT_MUTEXES |
137 | extern int max_lock_depth; | |
138 | #endif | |
139 | ||
1da177e4 LT |
140 | static int parse_table(int __user *, int, void __user *, size_t __user *, void __user *, size_t, |
141 | ctl_table *, void **); | |
142 | static int proc_doutsstring(ctl_table *table, int write, struct file *filp, | |
143 | void __user *buffer, size_t *lenp, loff_t *ppos); | |
144 | ||
145 | static ctl_table root_table[]; | |
146 | static struct ctl_table_header root_table_header = | |
147 | { root_table, LIST_HEAD_INIT(root_table_header.ctl_entry) }; | |
148 | ||
149 | static ctl_table kern_table[]; | |
150 | static ctl_table vm_table[]; | |
1da177e4 LT |
151 | static ctl_table fs_table[]; |
152 | static ctl_table debug_table[]; | |
153 | static ctl_table dev_table[]; | |
154 | extern ctl_table random_table[]; | |
155 | #ifdef CONFIG_UNIX98_PTYS | |
156 | extern ctl_table pty_table[]; | |
157 | #endif | |
2d9048e2 | 158 | #ifdef CONFIG_INOTIFY_USER |
0399cb08 RL |
159 | extern ctl_table inotify_table[]; |
160 | #endif | |
1da177e4 LT |
161 | |
162 | #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT | |
163 | int sysctl_legacy_va_layout; | |
164 | #endif | |
165 | ||
166 | /* /proc declarations: */ | |
167 | ||
168 | #ifdef CONFIG_PROC_FS | |
169 | ||
170 | static ssize_t proc_readsys(struct file *, char __user *, size_t, loff_t *); | |
171 | static ssize_t proc_writesys(struct file *, const char __user *, size_t, loff_t *); | |
172 | static int proc_opensys(struct inode *, struct file *); | |
173 | ||
174 | struct file_operations proc_sys_file_operations = { | |
175 | .open = proc_opensys, | |
176 | .read = proc_readsys, | |
177 | .write = proc_writesys, | |
178 | }; | |
179 | ||
180 | extern struct proc_dir_entry *proc_sys_root; | |
181 | ||
330d57fb | 182 | static void register_proc_table(ctl_table *, struct proc_dir_entry *, void *); |
1da177e4 LT |
183 | static void unregister_proc_table(ctl_table *, struct proc_dir_entry *); |
184 | #endif | |
185 | ||
186 | /* The default sysctl tables: */ | |
187 | ||
188 | static ctl_table root_table[] = { | |
189 | { | |
190 | .ctl_name = CTL_KERN, | |
191 | .procname = "kernel", | |
192 | .mode = 0555, | |
193 | .child = kern_table, | |
194 | }, | |
195 | { | |
196 | .ctl_name = CTL_VM, | |
197 | .procname = "vm", | |
198 | .mode = 0555, | |
199 | .child = vm_table, | |
200 | }, | |
201 | #ifdef CONFIG_NET | |
202 | { | |
203 | .ctl_name = CTL_NET, | |
204 | .procname = "net", | |
205 | .mode = 0555, | |
206 | .child = net_table, | |
207 | }, | |
208 | #endif | |
1da177e4 LT |
209 | { |
210 | .ctl_name = CTL_FS, | |
211 | .procname = "fs", | |
212 | .mode = 0555, | |
213 | .child = fs_table, | |
214 | }, | |
215 | { | |
216 | .ctl_name = CTL_DEBUG, | |
217 | .procname = "debug", | |
218 | .mode = 0555, | |
219 | .child = debug_table, | |
220 | }, | |
221 | { | |
222 | .ctl_name = CTL_DEV, | |
223 | .procname = "dev", | |
224 | .mode = 0555, | |
225 | .child = dev_table, | |
226 | }, | |
0eeca283 | 227 | |
1da177e4 LT |
228 | { .ctl_name = 0 } |
229 | }; | |
230 | ||
231 | static ctl_table kern_table[] = { | |
232 | { | |
233 | .ctl_name = KERN_OSTYPE, | |
234 | .procname = "ostype", | |
235 | .data = system_utsname.sysname, | |
236 | .maxlen = sizeof(system_utsname.sysname), | |
237 | .mode = 0444, | |
238 | .proc_handler = &proc_doutsstring, | |
239 | .strategy = &sysctl_string, | |
240 | }, | |
241 | { | |
242 | .ctl_name = KERN_OSRELEASE, | |
243 | .procname = "osrelease", | |
244 | .data = system_utsname.release, | |
245 | .maxlen = sizeof(system_utsname.release), | |
246 | .mode = 0444, | |
247 | .proc_handler = &proc_doutsstring, | |
248 | .strategy = &sysctl_string, | |
249 | }, | |
250 | { | |
251 | .ctl_name = KERN_VERSION, | |
252 | .procname = "version", | |
253 | .data = system_utsname.version, | |
254 | .maxlen = sizeof(system_utsname.version), | |
255 | .mode = 0444, | |
256 | .proc_handler = &proc_doutsstring, | |
257 | .strategy = &sysctl_string, | |
258 | }, | |
259 | { | |
260 | .ctl_name = KERN_NODENAME, | |
261 | .procname = "hostname", | |
262 | .data = system_utsname.nodename, | |
263 | .maxlen = sizeof(system_utsname.nodename), | |
264 | .mode = 0644, | |
265 | .proc_handler = &proc_doutsstring, | |
266 | .strategy = &sysctl_string, | |
267 | }, | |
268 | { | |
269 | .ctl_name = KERN_DOMAINNAME, | |
270 | .procname = "domainname", | |
271 | .data = system_utsname.domainname, | |
272 | .maxlen = sizeof(system_utsname.domainname), | |
273 | .mode = 0644, | |
274 | .proc_handler = &proc_doutsstring, | |
275 | .strategy = &sysctl_string, | |
276 | }, | |
277 | { | |
278 | .ctl_name = KERN_PANIC, | |
279 | .procname = "panic", | |
280 | .data = &panic_timeout, | |
281 | .maxlen = sizeof(int), | |
282 | .mode = 0644, | |
283 | .proc_handler = &proc_dointvec, | |
284 | }, | |
285 | { | |
286 | .ctl_name = KERN_CORE_USES_PID, | |
287 | .procname = "core_uses_pid", | |
288 | .data = &core_uses_pid, | |
289 | .maxlen = sizeof(int), | |
290 | .mode = 0644, | |
291 | .proc_handler = &proc_dointvec, | |
292 | }, | |
293 | { | |
294 | .ctl_name = KERN_CORE_PATTERN, | |
295 | .procname = "core_pattern", | |
296 | .data = core_pattern, | |
297 | .maxlen = 64, | |
298 | .mode = 0644, | |
299 | .proc_handler = &proc_dostring, | |
300 | .strategy = &sysctl_string, | |
301 | }, | |
302 | { | |
303 | .ctl_name = KERN_TAINTED, | |
304 | .procname = "tainted", | |
305 | .data = &tainted, | |
306 | .maxlen = sizeof(int), | |
307 | .mode = 0444, | |
308 | .proc_handler = &proc_dointvec, | |
309 | }, | |
310 | { | |
311 | .ctl_name = KERN_CAP_BSET, | |
312 | .procname = "cap-bound", | |
313 | .data = &cap_bset, | |
314 | .maxlen = sizeof(kernel_cap_t), | |
315 | .mode = 0600, | |
316 | .proc_handler = &proc_dointvec_bset, | |
317 | }, | |
318 | #ifdef CONFIG_BLK_DEV_INITRD | |
319 | { | |
320 | .ctl_name = KERN_REALROOTDEV, | |
321 | .procname = "real-root-dev", | |
322 | .data = &real_root_dev, | |
323 | .maxlen = sizeof(int), | |
324 | .mode = 0644, | |
325 | .proc_handler = &proc_dointvec, | |
326 | }, | |
327 | #endif | |
328 | #ifdef __sparc__ | |
329 | { | |
330 | .ctl_name = KERN_SPARC_REBOOT, | |
331 | .procname = "reboot-cmd", | |
332 | .data = reboot_command, | |
333 | .maxlen = 256, | |
334 | .mode = 0644, | |
335 | .proc_handler = &proc_dostring, | |
336 | .strategy = &sysctl_string, | |
337 | }, | |
338 | { | |
339 | .ctl_name = KERN_SPARC_STOP_A, | |
340 | .procname = "stop-a", | |
341 | .data = &stop_a_enabled, | |
342 | .maxlen = sizeof (int), | |
343 | .mode = 0644, | |
344 | .proc_handler = &proc_dointvec, | |
345 | }, | |
346 | { | |
347 | .ctl_name = KERN_SPARC_SCONS_PWROFF, | |
348 | .procname = "scons-poweroff", | |
349 | .data = &scons_pwroff, | |
350 | .maxlen = sizeof (int), | |
351 | .mode = 0644, | |
352 | .proc_handler = &proc_dointvec, | |
353 | }, | |
354 | #endif | |
355 | #ifdef __hppa__ | |
356 | { | |
357 | .ctl_name = KERN_HPPA_PWRSW, | |
358 | .procname = "soft-power", | |
359 | .data = &pwrsw_enabled, | |
360 | .maxlen = sizeof (int), | |
361 | .mode = 0644, | |
362 | .proc_handler = &proc_dointvec, | |
363 | }, | |
364 | { | |
365 | .ctl_name = KERN_HPPA_UNALIGNED, | |
366 | .procname = "unaligned-trap", | |
367 | .data = &unaligned_enabled, | |
368 | .maxlen = sizeof (int), | |
369 | .mode = 0644, | |
370 | .proc_handler = &proc_dointvec, | |
371 | }, | |
372 | #endif | |
373 | { | |
374 | .ctl_name = KERN_CTLALTDEL, | |
375 | .procname = "ctrl-alt-del", | |
376 | .data = &C_A_D, | |
377 | .maxlen = sizeof(int), | |
378 | .mode = 0644, | |
379 | .proc_handler = &proc_dointvec, | |
380 | }, | |
381 | { | |
382 | .ctl_name = KERN_PRINTK, | |
383 | .procname = "printk", | |
384 | .data = &console_loglevel, | |
385 | .maxlen = 4*sizeof(int), | |
386 | .mode = 0644, | |
387 | .proc_handler = &proc_dointvec, | |
388 | }, | |
389 | #ifdef CONFIG_KMOD | |
390 | { | |
391 | .ctl_name = KERN_MODPROBE, | |
392 | .procname = "modprobe", | |
393 | .data = &modprobe_path, | |
394 | .maxlen = KMOD_PATH_LEN, | |
395 | .mode = 0644, | |
396 | .proc_handler = &proc_dostring, | |
397 | .strategy = &sysctl_string, | |
398 | }, | |
399 | #endif | |
57ae2508 | 400 | #if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET) |
1da177e4 LT |
401 | { |
402 | .ctl_name = KERN_HOTPLUG, | |
403 | .procname = "hotplug", | |
312c004d KS |
404 | .data = &uevent_helper, |
405 | .maxlen = UEVENT_HELPER_PATH_LEN, | |
1da177e4 LT |
406 | .mode = 0644, |
407 | .proc_handler = &proc_dostring, | |
408 | .strategy = &sysctl_string, | |
409 | }, | |
410 | #endif | |
411 | #ifdef CONFIG_CHR_DEV_SG | |
412 | { | |
413 | .ctl_name = KERN_SG_BIG_BUFF, | |
414 | .procname = "sg-big-buff", | |
415 | .data = &sg_big_buff, | |
416 | .maxlen = sizeof (int), | |
417 | .mode = 0444, | |
418 | .proc_handler = &proc_dointvec, | |
419 | }, | |
420 | #endif | |
421 | #ifdef CONFIG_BSD_PROCESS_ACCT | |
422 | { | |
423 | .ctl_name = KERN_ACCT, | |
424 | .procname = "acct", | |
425 | .data = &acct_parm, | |
426 | .maxlen = 3*sizeof(int), | |
427 | .mode = 0644, | |
428 | .proc_handler = &proc_dointvec, | |
429 | }, | |
430 | #endif | |
431 | #ifdef CONFIG_SYSVIPC | |
432 | { | |
433 | .ctl_name = KERN_SHMMAX, | |
434 | .procname = "shmmax", | |
435 | .data = &shm_ctlmax, | |
436 | .maxlen = sizeof (size_t), | |
437 | .mode = 0644, | |
438 | .proc_handler = &proc_doulongvec_minmax, | |
439 | }, | |
440 | { | |
441 | .ctl_name = KERN_SHMALL, | |
442 | .procname = "shmall", | |
443 | .data = &shm_ctlall, | |
444 | .maxlen = sizeof (size_t), | |
445 | .mode = 0644, | |
446 | .proc_handler = &proc_doulongvec_minmax, | |
447 | }, | |
448 | { | |
449 | .ctl_name = KERN_SHMMNI, | |
450 | .procname = "shmmni", | |
451 | .data = &shm_ctlmni, | |
452 | .maxlen = sizeof (int), | |
453 | .mode = 0644, | |
454 | .proc_handler = &proc_dointvec, | |
455 | }, | |
456 | { | |
457 | .ctl_name = KERN_MSGMAX, | |
458 | .procname = "msgmax", | |
459 | .data = &msg_ctlmax, | |
460 | .maxlen = sizeof (int), | |
461 | .mode = 0644, | |
462 | .proc_handler = &proc_dointvec, | |
463 | }, | |
464 | { | |
465 | .ctl_name = KERN_MSGMNI, | |
466 | .procname = "msgmni", | |
467 | .data = &msg_ctlmni, | |
468 | .maxlen = sizeof (int), | |
469 | .mode = 0644, | |
470 | .proc_handler = &proc_dointvec, | |
471 | }, | |
472 | { | |
473 | .ctl_name = KERN_MSGMNB, | |
474 | .procname = "msgmnb", | |
475 | .data = &msg_ctlmnb, | |
476 | .maxlen = sizeof (int), | |
477 | .mode = 0644, | |
478 | .proc_handler = &proc_dointvec, | |
479 | }, | |
480 | { | |
481 | .ctl_name = KERN_SEM, | |
482 | .procname = "sem", | |
483 | .data = &sem_ctls, | |
484 | .maxlen = 4*sizeof (int), | |
485 | .mode = 0644, | |
486 | .proc_handler = &proc_dointvec, | |
487 | }, | |
488 | #endif | |
489 | #ifdef CONFIG_MAGIC_SYSRQ | |
490 | { | |
491 | .ctl_name = KERN_SYSRQ, | |
492 | .procname = "sysrq", | |
493 | .data = &sysrq_enabled, | |
494 | .maxlen = sizeof (int), | |
495 | .mode = 0644, | |
496 | .proc_handler = &proc_dointvec, | |
497 | }, | |
498 | #endif | |
499 | { | |
500 | .ctl_name = KERN_CADPID, | |
501 | .procname = "cad_pid", | |
502 | .data = &cad_pid, | |
503 | .maxlen = sizeof (int), | |
504 | .mode = 0600, | |
505 | .proc_handler = &proc_dointvec, | |
506 | }, | |
507 | { | |
508 | .ctl_name = KERN_MAX_THREADS, | |
509 | .procname = "threads-max", | |
510 | .data = &max_threads, | |
511 | .maxlen = sizeof(int), | |
512 | .mode = 0644, | |
513 | .proc_handler = &proc_dointvec, | |
514 | }, | |
515 | { | |
516 | .ctl_name = KERN_RANDOM, | |
517 | .procname = "random", | |
518 | .mode = 0555, | |
519 | .child = random_table, | |
520 | }, | |
521 | #ifdef CONFIG_UNIX98_PTYS | |
522 | { | |
523 | .ctl_name = KERN_PTY, | |
524 | .procname = "pty", | |
525 | .mode = 0555, | |
526 | .child = pty_table, | |
527 | }, | |
528 | #endif | |
529 | { | |
530 | .ctl_name = KERN_OVERFLOWUID, | |
531 | .procname = "overflowuid", | |
532 | .data = &overflowuid, | |
533 | .maxlen = sizeof(int), | |
534 | .mode = 0644, | |
535 | .proc_handler = &proc_dointvec_minmax, | |
536 | .strategy = &sysctl_intvec, | |
537 | .extra1 = &minolduid, | |
538 | .extra2 = &maxolduid, | |
539 | }, | |
540 | { | |
541 | .ctl_name = KERN_OVERFLOWGID, | |
542 | .procname = "overflowgid", | |
543 | .data = &overflowgid, | |
544 | .maxlen = sizeof(int), | |
545 | .mode = 0644, | |
546 | .proc_handler = &proc_dointvec_minmax, | |
547 | .strategy = &sysctl_intvec, | |
548 | .extra1 = &minolduid, | |
549 | .extra2 = &maxolduid, | |
550 | }, | |
347a8dc3 | 551 | #ifdef CONFIG_S390 |
1da177e4 LT |
552 | #ifdef CONFIG_MATHEMU |
553 | { | |
554 | .ctl_name = KERN_IEEE_EMULATION_WARNINGS, | |
555 | .procname = "ieee_emulation_warnings", | |
556 | .data = &sysctl_ieee_emulation_warnings, | |
557 | .maxlen = sizeof(int), | |
558 | .mode = 0644, | |
559 | .proc_handler = &proc_dointvec, | |
560 | }, | |
561 | #endif | |
562 | #ifdef CONFIG_NO_IDLE_HZ | |
563 | { | |
564 | .ctl_name = KERN_HZ_TIMER, | |
565 | .procname = "hz_timer", | |
566 | .data = &sysctl_hz_timer, | |
567 | .maxlen = sizeof(int), | |
568 | .mode = 0644, | |
569 | .proc_handler = &proc_dointvec, | |
570 | }, | |
571 | #endif | |
572 | { | |
573 | .ctl_name = KERN_S390_USER_DEBUG_LOGGING, | |
574 | .procname = "userprocess_debug", | |
575 | .data = &sysctl_userprocess_debug, | |
576 | .maxlen = sizeof(int), | |
577 | .mode = 0644, | |
578 | .proc_handler = &proc_dointvec, | |
579 | }, | |
580 | #endif | |
581 | { | |
582 | .ctl_name = KERN_PIDMAX, | |
583 | .procname = "pid_max", | |
584 | .data = &pid_max, | |
585 | .maxlen = sizeof (int), | |
586 | .mode = 0644, | |
587 | .proc_handler = &proc_dointvec_minmax, | |
588 | .strategy = sysctl_intvec, | |
589 | .extra1 = &pid_max_min, | |
590 | .extra2 = &pid_max_max, | |
591 | }, | |
592 | { | |
593 | .ctl_name = KERN_PANIC_ON_OOPS, | |
594 | .procname = "panic_on_oops", | |
595 | .data = &panic_on_oops, | |
596 | .maxlen = sizeof(int), | |
597 | .mode = 0644, | |
598 | .proc_handler = &proc_dointvec, | |
599 | }, | |
600 | { | |
601 | .ctl_name = KERN_PRINTK_RATELIMIT, | |
602 | .procname = "printk_ratelimit", | |
603 | .data = &printk_ratelimit_jiffies, | |
604 | .maxlen = sizeof(int), | |
605 | .mode = 0644, | |
606 | .proc_handler = &proc_dointvec_jiffies, | |
607 | .strategy = &sysctl_jiffies, | |
608 | }, | |
609 | { | |
610 | .ctl_name = KERN_PRINTK_RATELIMIT_BURST, | |
611 | .procname = "printk_ratelimit_burst", | |
612 | .data = &printk_ratelimit_burst, | |
613 | .maxlen = sizeof(int), | |
614 | .mode = 0644, | |
615 | .proc_handler = &proc_dointvec, | |
616 | }, | |
617 | { | |
618 | .ctl_name = KERN_NGROUPS_MAX, | |
619 | .procname = "ngroups_max", | |
620 | .data = &ngroups_max, | |
621 | .maxlen = sizeof (int), | |
622 | .mode = 0444, | |
623 | .proc_handler = &proc_dointvec, | |
624 | }, | |
625 | #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86) | |
626 | { | |
627 | .ctl_name = KERN_UNKNOWN_NMI_PANIC, | |
628 | .procname = "unknown_nmi_panic", | |
629 | .data = &unknown_nmi_panic, | |
630 | .maxlen = sizeof (int), | |
631 | .mode = 0644, | |
2fbe7b25 | 632 | .proc_handler = &proc_dointvec, |
1da177e4 | 633 | }, |
407984f1 DZ |
634 | { |
635 | .ctl_name = KERN_NMI_WATCHDOG, | |
636 | .procname = "nmi_watchdog", | |
637 | .data = &nmi_watchdog_enabled, | |
638 | .maxlen = sizeof (int), | |
639 | .mode = 0644, | |
640 | .proc_handler = &proc_nmi_enabled, | |
1da177e4 LT |
641 | }, |
642 | #endif | |
643 | #if defined(CONFIG_X86) | |
8da5adda DZ |
644 | { |
645 | .ctl_name = KERN_PANIC_ON_NMI, | |
646 | .procname = "panic_on_unrecovered_nmi", | |
647 | .data = &panic_on_unrecovered_nmi, | |
648 | .maxlen = sizeof(int), | |
649 | .mode = 0644, | |
650 | .proc_handler = &proc_dointvec, | |
651 | }, | |
1da177e4 LT |
652 | { |
653 | .ctl_name = KERN_BOOTLOADER_TYPE, | |
654 | .procname = "bootloader_type", | |
655 | .data = &bootloader_type, | |
656 | .maxlen = sizeof (int), | |
657 | .mode = 0444, | |
658 | .proc_handler = &proc_dointvec, | |
659 | }, | |
660 | #endif | |
7a9166e3 | 661 | #if defined(CONFIG_MMU) |
1da177e4 LT |
662 | { |
663 | .ctl_name = KERN_RANDOMIZE, | |
664 | .procname = "randomize_va_space", | |
665 | .data = &randomize_va_space, | |
666 | .maxlen = sizeof(int), | |
667 | .mode = 0644, | |
668 | .proc_handler = &proc_dointvec, | |
669 | }, | |
7a9166e3 | 670 | #endif |
0152fb37 | 671 | #if defined(CONFIG_S390) && defined(CONFIG_SMP) |
951f22d5 MS |
672 | { |
673 | .ctl_name = KERN_SPIN_RETRY, | |
674 | .procname = "spin_retry", | |
675 | .data = &spin_retry, | |
676 | .maxlen = sizeof (int), | |
677 | .mode = 0644, | |
678 | .proc_handler = &proc_dointvec, | |
679 | }, | |
c255d844 PM |
680 | #endif |
681 | #ifdef CONFIG_ACPI_SLEEP | |
682 | { | |
683 | .ctl_name = KERN_ACPI_VIDEO_FLAGS, | |
684 | .procname = "acpi_video_flags", | |
685 | .data = &acpi_video_flags, | |
686 | .maxlen = sizeof (unsigned long), | |
687 | .mode = 0644, | |
7f99f06f | 688 | .proc_handler = &proc_doulongvec_minmax, |
c255d844 | 689 | }, |
d2b176ed JS |
690 | #endif |
691 | #ifdef CONFIG_IA64 | |
692 | { | |
693 | .ctl_name = KERN_IA64_UNALIGNED, | |
694 | .procname = "ignore-unaligned-usertrap", | |
695 | .data = &no_unaligned_warning, | |
696 | .maxlen = sizeof (int), | |
697 | .mode = 0644, | |
698 | .proc_handler = &proc_dointvec, | |
699 | }, | |
bebfa101 AK |
700 | #endif |
701 | #ifdef CONFIG_COMPAT | |
702 | { | |
703 | .ctl_name = KERN_COMPAT_LOG, | |
704 | .procname = "compat-log", | |
705 | .data = &compat_log, | |
706 | .maxlen = sizeof (int), | |
707 | .mode = 0644, | |
708 | .proc_handler = &proc_dointvec, | |
709 | }, | |
951f22d5 | 710 | #endif |
23f78d4a IM |
711 | #ifdef CONFIG_RT_MUTEXES |
712 | { | |
713 | .ctl_name = KERN_MAX_LOCK_DEPTH, | |
714 | .procname = "max_lock_depth", | |
715 | .data = &max_lock_depth, | |
716 | .maxlen = sizeof(int), | |
717 | .mode = 0644, | |
718 | .proc_handler = &proc_dointvec, | |
719 | }, | |
720 | #endif | |
721 | ||
1da177e4 LT |
722 | { .ctl_name = 0 } |
723 | }; | |
724 | ||
725 | /* Constants for minimum and maximum testing in vm_table. | |
726 | We use these as one-element integer vectors. */ | |
727 | static int zero; | |
728 | static int one_hundred = 100; | |
729 | ||
730 | ||
731 | static ctl_table vm_table[] = { | |
732 | { | |
733 | .ctl_name = VM_OVERCOMMIT_MEMORY, | |
734 | .procname = "overcommit_memory", | |
735 | .data = &sysctl_overcommit_memory, | |
736 | .maxlen = sizeof(sysctl_overcommit_memory), | |
737 | .mode = 0644, | |
738 | .proc_handler = &proc_dointvec, | |
739 | }, | |
fadd8fbd KH |
740 | { |
741 | .ctl_name = VM_PANIC_ON_OOM, | |
742 | .procname = "panic_on_oom", | |
743 | .data = &sysctl_panic_on_oom, | |
744 | .maxlen = sizeof(sysctl_panic_on_oom), | |
745 | .mode = 0644, | |
746 | .proc_handler = &proc_dointvec, | |
747 | }, | |
1da177e4 LT |
748 | { |
749 | .ctl_name = VM_OVERCOMMIT_RATIO, | |
750 | .procname = "overcommit_ratio", | |
751 | .data = &sysctl_overcommit_ratio, | |
752 | .maxlen = sizeof(sysctl_overcommit_ratio), | |
753 | .mode = 0644, | |
754 | .proc_handler = &proc_dointvec, | |
755 | }, | |
756 | { | |
757 | .ctl_name = VM_PAGE_CLUSTER, | |
758 | .procname = "page-cluster", | |
759 | .data = &page_cluster, | |
760 | .maxlen = sizeof(int), | |
761 | .mode = 0644, | |
762 | .proc_handler = &proc_dointvec, | |
763 | }, | |
764 | { | |
765 | .ctl_name = VM_DIRTY_BACKGROUND, | |
766 | .procname = "dirty_background_ratio", | |
767 | .data = &dirty_background_ratio, | |
768 | .maxlen = sizeof(dirty_background_ratio), | |
769 | .mode = 0644, | |
770 | .proc_handler = &proc_dointvec_minmax, | |
771 | .strategy = &sysctl_intvec, | |
772 | .extra1 = &zero, | |
773 | .extra2 = &one_hundred, | |
774 | }, | |
775 | { | |
776 | .ctl_name = VM_DIRTY_RATIO, | |
777 | .procname = "dirty_ratio", | |
778 | .data = &vm_dirty_ratio, | |
779 | .maxlen = sizeof(vm_dirty_ratio), | |
780 | .mode = 0644, | |
781 | .proc_handler = &proc_dointvec_minmax, | |
782 | .strategy = &sysctl_intvec, | |
783 | .extra1 = &zero, | |
784 | .extra2 = &one_hundred, | |
785 | }, | |
786 | { | |
787 | .ctl_name = VM_DIRTY_WB_CS, | |
788 | .procname = "dirty_writeback_centisecs", | |
f6ef9438 BS |
789 | .data = &dirty_writeback_interval, |
790 | .maxlen = sizeof(dirty_writeback_interval), | |
1da177e4 LT |
791 | .mode = 0644, |
792 | .proc_handler = &dirty_writeback_centisecs_handler, | |
793 | }, | |
794 | { | |
795 | .ctl_name = VM_DIRTY_EXPIRE_CS, | |
796 | .procname = "dirty_expire_centisecs", | |
f6ef9438 BS |
797 | .data = &dirty_expire_interval, |
798 | .maxlen = sizeof(dirty_expire_interval), | |
1da177e4 | 799 | .mode = 0644, |
f6ef9438 | 800 | .proc_handler = &proc_dointvec_userhz_jiffies, |
1da177e4 LT |
801 | }, |
802 | { | |
803 | .ctl_name = VM_NR_PDFLUSH_THREADS, | |
804 | .procname = "nr_pdflush_threads", | |
805 | .data = &nr_pdflush_threads, | |
806 | .maxlen = sizeof nr_pdflush_threads, | |
807 | .mode = 0444 /* read-only*/, | |
808 | .proc_handler = &proc_dointvec, | |
809 | }, | |
810 | { | |
811 | .ctl_name = VM_SWAPPINESS, | |
812 | .procname = "swappiness", | |
813 | .data = &vm_swappiness, | |
814 | .maxlen = sizeof(vm_swappiness), | |
815 | .mode = 0644, | |
816 | .proc_handler = &proc_dointvec_minmax, | |
817 | .strategy = &sysctl_intvec, | |
818 | .extra1 = &zero, | |
819 | .extra2 = &one_hundred, | |
820 | }, | |
821 | #ifdef CONFIG_HUGETLB_PAGE | |
822 | { | |
823 | .ctl_name = VM_HUGETLB_PAGES, | |
824 | .procname = "nr_hugepages", | |
825 | .data = &max_huge_pages, | |
826 | .maxlen = sizeof(unsigned long), | |
827 | .mode = 0644, | |
828 | .proc_handler = &hugetlb_sysctl_handler, | |
829 | .extra1 = (void *)&hugetlb_zero, | |
830 | .extra2 = (void *)&hugetlb_infinity, | |
831 | }, | |
832 | { | |
833 | .ctl_name = VM_HUGETLB_GROUP, | |
834 | .procname = "hugetlb_shm_group", | |
835 | .data = &sysctl_hugetlb_shm_group, | |
836 | .maxlen = sizeof(gid_t), | |
837 | .mode = 0644, | |
838 | .proc_handler = &proc_dointvec, | |
839 | }, | |
840 | #endif | |
841 | { | |
842 | .ctl_name = VM_LOWMEM_RESERVE_RATIO, | |
843 | .procname = "lowmem_reserve_ratio", | |
844 | .data = &sysctl_lowmem_reserve_ratio, | |
845 | .maxlen = sizeof(sysctl_lowmem_reserve_ratio), | |
846 | .mode = 0644, | |
847 | .proc_handler = &lowmem_reserve_ratio_sysctl_handler, | |
848 | .strategy = &sysctl_intvec, | |
849 | }, | |
9d0243bc AM |
850 | { |
851 | .ctl_name = VM_DROP_PAGECACHE, | |
852 | .procname = "drop_caches", | |
853 | .data = &sysctl_drop_caches, | |
854 | .maxlen = sizeof(int), | |
855 | .mode = 0644, | |
856 | .proc_handler = drop_caches_sysctl_handler, | |
857 | .strategy = &sysctl_intvec, | |
858 | }, | |
1da177e4 LT |
859 | { |
860 | .ctl_name = VM_MIN_FREE_KBYTES, | |
861 | .procname = "min_free_kbytes", | |
862 | .data = &min_free_kbytes, | |
863 | .maxlen = sizeof(min_free_kbytes), | |
864 | .mode = 0644, | |
865 | .proc_handler = &min_free_kbytes_sysctl_handler, | |
866 | .strategy = &sysctl_intvec, | |
867 | .extra1 = &zero, | |
868 | }, | |
8ad4b1fb RS |
869 | { |
870 | .ctl_name = VM_PERCPU_PAGELIST_FRACTION, | |
871 | .procname = "percpu_pagelist_fraction", | |
872 | .data = &percpu_pagelist_fraction, | |
873 | .maxlen = sizeof(percpu_pagelist_fraction), | |
874 | .mode = 0644, | |
875 | .proc_handler = &percpu_pagelist_fraction_sysctl_handler, | |
876 | .strategy = &sysctl_intvec, | |
877 | .extra1 = &min_percpu_pagelist_fract, | |
878 | }, | |
1da177e4 LT |
879 | #ifdef CONFIG_MMU |
880 | { | |
881 | .ctl_name = VM_MAX_MAP_COUNT, | |
882 | .procname = "max_map_count", | |
883 | .data = &sysctl_max_map_count, | |
884 | .maxlen = sizeof(sysctl_max_map_count), | |
885 | .mode = 0644, | |
886 | .proc_handler = &proc_dointvec | |
887 | }, | |
888 | #endif | |
889 | { | |
890 | .ctl_name = VM_LAPTOP_MODE, | |
891 | .procname = "laptop_mode", | |
892 | .data = &laptop_mode, | |
893 | .maxlen = sizeof(laptop_mode), | |
894 | .mode = 0644, | |
ed5b43f1 BS |
895 | .proc_handler = &proc_dointvec_jiffies, |
896 | .strategy = &sysctl_jiffies, | |
1da177e4 LT |
897 | }, |
898 | { | |
899 | .ctl_name = VM_BLOCK_DUMP, | |
900 | .procname = "block_dump", | |
901 | .data = &block_dump, | |
902 | .maxlen = sizeof(block_dump), | |
903 | .mode = 0644, | |
904 | .proc_handler = &proc_dointvec, | |
905 | .strategy = &sysctl_intvec, | |
906 | .extra1 = &zero, | |
907 | }, | |
908 | { | |
909 | .ctl_name = VM_VFS_CACHE_PRESSURE, | |
910 | .procname = "vfs_cache_pressure", | |
911 | .data = &sysctl_vfs_cache_pressure, | |
912 | .maxlen = sizeof(sysctl_vfs_cache_pressure), | |
913 | .mode = 0644, | |
914 | .proc_handler = &proc_dointvec, | |
915 | .strategy = &sysctl_intvec, | |
916 | .extra1 = &zero, | |
917 | }, | |
918 | #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT | |
919 | { | |
920 | .ctl_name = VM_LEGACY_VA_LAYOUT, | |
921 | .procname = "legacy_va_layout", | |
922 | .data = &sysctl_legacy_va_layout, | |
923 | .maxlen = sizeof(sysctl_legacy_va_layout), | |
924 | .mode = 0644, | |
925 | .proc_handler = &proc_dointvec, | |
926 | .strategy = &sysctl_intvec, | |
927 | .extra1 = &zero, | |
928 | }, | |
929 | #endif | |
930 | #ifdef CONFIG_SWAP | |
931 | { | |
932 | .ctl_name = VM_SWAP_TOKEN_TIMEOUT, | |
933 | .procname = "swap_token_timeout", | |
934 | .data = &swap_token_default_timeout, | |
935 | .maxlen = sizeof(swap_token_default_timeout), | |
936 | .mode = 0644, | |
937 | .proc_handler = &proc_dointvec_jiffies, | |
938 | .strategy = &sysctl_jiffies, | |
939 | }, | |
1743660b CL |
940 | #endif |
941 | #ifdef CONFIG_NUMA | |
942 | { | |
943 | .ctl_name = VM_ZONE_RECLAIM_MODE, | |
944 | .procname = "zone_reclaim_mode", | |
945 | .data = &zone_reclaim_mode, | |
946 | .maxlen = sizeof(zone_reclaim_mode), | |
947 | .mode = 0644, | |
948 | .proc_handler = &proc_dointvec, | |
c84db23c CL |
949 | .strategy = &sysctl_intvec, |
950 | .extra1 = &zero, | |
1743660b | 951 | }, |
9614634f CL |
952 | { |
953 | .ctl_name = VM_MIN_UNMAPPED, | |
954 | .procname = "min_unmapped_ratio", | |
955 | .data = &sysctl_min_unmapped_ratio, | |
956 | .maxlen = sizeof(sysctl_min_unmapped_ratio), | |
957 | .mode = 0644, | |
958 | .proc_handler = &sysctl_min_unmapped_ratio_sysctl_handler, | |
959 | .strategy = &sysctl_intvec, | |
960 | .extra1 = &zero, | |
961 | .extra2 = &one_hundred, | |
962 | }, | |
0ff38490 CL |
963 | { |
964 | .ctl_name = VM_MIN_SLAB, | |
965 | .procname = "min_slab_ratio", | |
966 | .data = &sysctl_min_slab_ratio, | |
967 | .maxlen = sizeof(sysctl_min_slab_ratio), | |
968 | .mode = 0644, | |
969 | .proc_handler = &sysctl_min_slab_ratio_sysctl_handler, | |
970 | .strategy = &sysctl_intvec, | |
971 | .extra1 = &zero, | |
972 | .extra2 = &one_hundred, | |
973 | }, | |
e6e5494c IM |
974 | #endif |
975 | #ifdef CONFIG_X86_32 | |
976 | { | |
977 | .ctl_name = VM_VDSO_ENABLED, | |
978 | .procname = "vdso_enabled", | |
979 | .data = &vdso_enabled, | |
980 | .maxlen = sizeof(vdso_enabled), | |
981 | .mode = 0644, | |
982 | .proc_handler = &proc_dointvec, | |
983 | .strategy = &sysctl_intvec, | |
984 | .extra1 = &zero, | |
985 | }, | |
1da177e4 LT |
986 | #endif |
987 | { .ctl_name = 0 } | |
988 | }; | |
989 | ||
1da177e4 LT |
990 | static ctl_table fs_table[] = { |
991 | { | |
992 | .ctl_name = FS_NRINODE, | |
993 | .procname = "inode-nr", | |
994 | .data = &inodes_stat, | |
995 | .maxlen = 2*sizeof(int), | |
996 | .mode = 0444, | |
997 | .proc_handler = &proc_dointvec, | |
998 | }, | |
999 | { | |
1000 | .ctl_name = FS_STATINODE, | |
1001 | .procname = "inode-state", | |
1002 | .data = &inodes_stat, | |
1003 | .maxlen = 7*sizeof(int), | |
1004 | .mode = 0444, | |
1005 | .proc_handler = &proc_dointvec, | |
1006 | }, | |
1007 | { | |
1008 | .ctl_name = FS_NRFILE, | |
1009 | .procname = "file-nr", | |
1010 | .data = &files_stat, | |
1011 | .maxlen = 3*sizeof(int), | |
1012 | .mode = 0444, | |
529bf6be | 1013 | .proc_handler = &proc_nr_files, |
1da177e4 LT |
1014 | }, |
1015 | { | |
1016 | .ctl_name = FS_MAXFILE, | |
1017 | .procname = "file-max", | |
1018 | .data = &files_stat.max_files, | |
1019 | .maxlen = sizeof(int), | |
1020 | .mode = 0644, | |
1021 | .proc_handler = &proc_dointvec, | |
1022 | }, | |
1023 | { | |
1024 | .ctl_name = FS_DENTRY, | |
1025 | .procname = "dentry-state", | |
1026 | .data = &dentry_stat, | |
1027 | .maxlen = 6*sizeof(int), | |
1028 | .mode = 0444, | |
1029 | .proc_handler = &proc_dointvec, | |
1030 | }, | |
1031 | { | |
1032 | .ctl_name = FS_OVERFLOWUID, | |
1033 | .procname = "overflowuid", | |
1034 | .data = &fs_overflowuid, | |
1035 | .maxlen = sizeof(int), | |
1036 | .mode = 0644, | |
1037 | .proc_handler = &proc_dointvec_minmax, | |
1038 | .strategy = &sysctl_intvec, | |
1039 | .extra1 = &minolduid, | |
1040 | .extra2 = &maxolduid, | |
1041 | }, | |
1042 | { | |
1043 | .ctl_name = FS_OVERFLOWGID, | |
1044 | .procname = "overflowgid", | |
1045 | .data = &fs_overflowgid, | |
1046 | .maxlen = sizeof(int), | |
1047 | .mode = 0644, | |
1048 | .proc_handler = &proc_dointvec_minmax, | |
1049 | .strategy = &sysctl_intvec, | |
1050 | .extra1 = &minolduid, | |
1051 | .extra2 = &maxolduid, | |
1052 | }, | |
1053 | { | |
1054 | .ctl_name = FS_LEASES, | |
1055 | .procname = "leases-enable", | |
1056 | .data = &leases_enable, | |
1057 | .maxlen = sizeof(int), | |
1058 | .mode = 0644, | |
1059 | .proc_handler = &proc_dointvec, | |
1060 | }, | |
1061 | #ifdef CONFIG_DNOTIFY | |
1062 | { | |
1063 | .ctl_name = FS_DIR_NOTIFY, | |
1064 | .procname = "dir-notify-enable", | |
1065 | .data = &dir_notify_enable, | |
1066 | .maxlen = sizeof(int), | |
1067 | .mode = 0644, | |
1068 | .proc_handler = &proc_dointvec, | |
1069 | }, | |
1070 | #endif | |
1071 | #ifdef CONFIG_MMU | |
1072 | { | |
1073 | .ctl_name = FS_LEASE_TIME, | |
1074 | .procname = "lease-break-time", | |
1075 | .data = &lease_break_time, | |
1076 | .maxlen = sizeof(int), | |
1077 | .mode = 0644, | |
1078 | .proc_handler = &proc_dointvec, | |
1079 | }, | |
1080 | { | |
1081 | .ctl_name = FS_AIO_NR, | |
1082 | .procname = "aio-nr", | |
1083 | .data = &aio_nr, | |
1084 | .maxlen = sizeof(aio_nr), | |
1085 | .mode = 0444, | |
d55b5fda | 1086 | .proc_handler = &proc_doulongvec_minmax, |
1da177e4 LT |
1087 | }, |
1088 | { | |
1089 | .ctl_name = FS_AIO_MAX_NR, | |
1090 | .procname = "aio-max-nr", | |
1091 | .data = &aio_max_nr, | |
1092 | .maxlen = sizeof(aio_max_nr), | |
1093 | .mode = 0644, | |
d55b5fda | 1094 | .proc_handler = &proc_doulongvec_minmax, |
1da177e4 | 1095 | }, |
2d9048e2 | 1096 | #ifdef CONFIG_INOTIFY_USER |
0399cb08 RL |
1097 | { |
1098 | .ctl_name = FS_INOTIFY, | |
1099 | .procname = "inotify", | |
1100 | .mode = 0555, | |
1101 | .child = inotify_table, | |
1102 | }, | |
1103 | #endif | |
1da177e4 | 1104 | #endif |
d6e71144 AC |
1105 | { |
1106 | .ctl_name = KERN_SETUID_DUMPABLE, | |
1107 | .procname = "suid_dumpable", | |
1108 | .data = &suid_dumpable, | |
1109 | .maxlen = sizeof(int), | |
1110 | .mode = 0644, | |
1111 | .proc_handler = &proc_dointvec, | |
1112 | }, | |
1da177e4 LT |
1113 | { .ctl_name = 0 } |
1114 | }; | |
1115 | ||
1116 | static ctl_table debug_table[] = { | |
1117 | { .ctl_name = 0 } | |
1118 | }; | |
1119 | ||
1120 | static ctl_table dev_table[] = { | |
1121 | { .ctl_name = 0 } | |
0eeca283 | 1122 | }; |
1da177e4 LT |
1123 | |
1124 | extern void init_irq_proc (void); | |
1125 | ||
330d57fb AV |
1126 | static DEFINE_SPINLOCK(sysctl_lock); |
1127 | ||
1128 | /* called under sysctl_lock */ | |
1129 | static int use_table(struct ctl_table_header *p) | |
1130 | { | |
1131 | if (unlikely(p->unregistering)) | |
1132 | return 0; | |
1133 | p->used++; | |
1134 | return 1; | |
1135 | } | |
1136 | ||
1137 | /* called under sysctl_lock */ | |
1138 | static void unuse_table(struct ctl_table_header *p) | |
1139 | { | |
1140 | if (!--p->used) | |
1141 | if (unlikely(p->unregistering)) | |
1142 | complete(p->unregistering); | |
1143 | } | |
1144 | ||
1145 | /* called under sysctl_lock, will reacquire if has to wait */ | |
1146 | static void start_unregistering(struct ctl_table_header *p) | |
1147 | { | |
1148 | /* | |
1149 | * if p->used is 0, nobody will ever touch that entry again; | |
1150 | * we'll eliminate all paths to it before dropping sysctl_lock | |
1151 | */ | |
1152 | if (unlikely(p->used)) { | |
1153 | struct completion wait; | |
1154 | init_completion(&wait); | |
1155 | p->unregistering = &wait; | |
1156 | spin_unlock(&sysctl_lock); | |
1157 | wait_for_completion(&wait); | |
1158 | spin_lock(&sysctl_lock); | |
1159 | } | |
1160 | /* | |
1161 | * do not remove from the list until nobody holds it; walking the | |
1162 | * list in do_sysctl() relies on that. | |
1163 | */ | |
1164 | list_del_init(&p->ctl_entry); | |
1165 | } | |
1166 | ||
1da177e4 LT |
1167 | void __init sysctl_init(void) |
1168 | { | |
1169 | #ifdef CONFIG_PROC_FS | |
330d57fb | 1170 | register_proc_table(root_table, proc_sys_root, &root_table_header); |
1da177e4 LT |
1171 | init_irq_proc(); |
1172 | #endif | |
1173 | } | |
1174 | ||
1175 | int do_sysctl(int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp, | |
1176 | void __user *newval, size_t newlen) | |
1177 | { | |
1178 | struct list_head *tmp; | |
330d57fb | 1179 | int error = -ENOTDIR; |
1da177e4 LT |
1180 | |
1181 | if (nlen <= 0 || nlen >= CTL_MAXNAME) | |
1182 | return -ENOTDIR; | |
1183 | if (oldval) { | |
1184 | int old_len; | |
1185 | if (!oldlenp || get_user(old_len, oldlenp)) | |
1186 | return -EFAULT; | |
1187 | } | |
330d57fb | 1188 | spin_lock(&sysctl_lock); |
1da177e4 LT |
1189 | tmp = &root_table_header.ctl_entry; |
1190 | do { | |
1191 | struct ctl_table_header *head = | |
1192 | list_entry(tmp, struct ctl_table_header, ctl_entry); | |
1193 | void *context = NULL; | |
330d57fb AV |
1194 | |
1195 | if (!use_table(head)) | |
1196 | continue; | |
1197 | ||
1198 | spin_unlock(&sysctl_lock); | |
1199 | ||
1200 | error = parse_table(name, nlen, oldval, oldlenp, | |
1da177e4 LT |
1201 | newval, newlen, head->ctl_table, |
1202 | &context); | |
5a6b454f | 1203 | kfree(context); |
330d57fb AV |
1204 | |
1205 | spin_lock(&sysctl_lock); | |
1206 | unuse_table(head); | |
1da177e4 | 1207 | if (error != -ENOTDIR) |
330d57fb AV |
1208 | break; |
1209 | } while ((tmp = tmp->next) != &root_table_header.ctl_entry); | |
1210 | spin_unlock(&sysctl_lock); | |
1211 | return error; | |
1da177e4 LT |
1212 | } |
1213 | ||
1214 | asmlinkage long sys_sysctl(struct __sysctl_args __user *args) | |
1215 | { | |
1216 | struct __sysctl_args tmp; | |
1217 | int error; | |
1218 | ||
1219 | if (copy_from_user(&tmp, args, sizeof(tmp))) | |
1220 | return -EFAULT; | |
1221 | ||
1222 | lock_kernel(); | |
1223 | error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp, | |
1224 | tmp.newval, tmp.newlen); | |
1225 | unlock_kernel(); | |
1226 | return error; | |
1227 | } | |
1228 | ||
1229 | /* | |
1230 | * ctl_perm does NOT grant the superuser all rights automatically, because | |
1231 | * some sysctl variables are readonly even to root. | |
1232 | */ | |
1233 | ||
1234 | static int test_perm(int mode, int op) | |
1235 | { | |
1236 | if (!current->euid) | |
1237 | mode >>= 6; | |
1238 | else if (in_egroup_p(0)) | |
1239 | mode >>= 3; | |
1240 | if ((mode & op & 0007) == op) | |
1241 | return 0; | |
1242 | return -EACCES; | |
1243 | } | |
1244 | ||
1245 | static inline int ctl_perm(ctl_table *table, int op) | |
1246 | { | |
1247 | int error; | |
1248 | error = security_sysctl(table, op); | |
1249 | if (error) | |
1250 | return error; | |
1251 | return test_perm(table->mode, op); | |
1252 | } | |
1253 | ||
1254 | static int parse_table(int __user *name, int nlen, | |
1255 | void __user *oldval, size_t __user *oldlenp, | |
1256 | void __user *newval, size_t newlen, | |
1257 | ctl_table *table, void **context) | |
1258 | { | |
1259 | int n; | |
1260 | repeat: | |
1261 | if (!nlen) | |
1262 | return -ENOTDIR; | |
1263 | if (get_user(n, name)) | |
1264 | return -EFAULT; | |
1265 | for ( ; table->ctl_name; table++) { | |
1266 | if (n == table->ctl_name || table->ctl_name == CTL_ANY) { | |
1267 | int error; | |
1268 | if (table->child) { | |
1269 | if (ctl_perm(table, 001)) | |
1270 | return -EPERM; | |
1271 | if (table->strategy) { | |
1272 | error = table->strategy( | |
1273 | table, name, nlen, | |
1274 | oldval, oldlenp, | |
1275 | newval, newlen, context); | |
1276 | if (error) | |
1277 | return error; | |
1278 | } | |
1279 | name++; | |
1280 | nlen--; | |
1281 | table = table->child; | |
1282 | goto repeat; | |
1283 | } | |
1284 | error = do_sysctl_strategy(table, name, nlen, | |
1285 | oldval, oldlenp, | |
1286 | newval, newlen, context); | |
1287 | return error; | |
1288 | } | |
1289 | } | |
1290 | return -ENOTDIR; | |
1291 | } | |
1292 | ||
1293 | /* Perform the actual read/write of a sysctl table entry. */ | |
1294 | int do_sysctl_strategy (ctl_table *table, | |
1295 | int __user *name, int nlen, | |
1296 | void __user *oldval, size_t __user *oldlenp, | |
1297 | void __user *newval, size_t newlen, void **context) | |
1298 | { | |
1299 | int op = 0, rc; | |
1300 | size_t len; | |
1301 | ||
1302 | if (oldval) | |
1303 | op |= 004; | |
1304 | if (newval) | |
1305 | op |= 002; | |
1306 | if (ctl_perm(table, op)) | |
1307 | return -EPERM; | |
1308 | ||
1309 | if (table->strategy) { | |
1310 | rc = table->strategy(table, name, nlen, oldval, oldlenp, | |
1311 | newval, newlen, context); | |
1312 | if (rc < 0) | |
1313 | return rc; | |
1314 | if (rc > 0) | |
1315 | return 0; | |
1316 | } | |
1317 | ||
1318 | /* If there is no strategy routine, or if the strategy returns | |
1319 | * zero, proceed with automatic r/w */ | |
1320 | if (table->data && table->maxlen) { | |
1321 | if (oldval && oldlenp) { | |
1322 | if (get_user(len, oldlenp)) | |
1323 | return -EFAULT; | |
1324 | if (len) { | |
1325 | if (len > table->maxlen) | |
1326 | len = table->maxlen; | |
1327 | if(copy_to_user(oldval, table->data, len)) | |
1328 | return -EFAULT; | |
1329 | if(put_user(len, oldlenp)) | |
1330 | return -EFAULT; | |
1331 | } | |
1332 | } | |
1333 | if (newval && newlen) { | |
1334 | len = newlen; | |
1335 | if (len > table->maxlen) | |
1336 | len = table->maxlen; | |
1337 | if(copy_from_user(table->data, newval, len)) | |
1338 | return -EFAULT; | |
1339 | } | |
1340 | } | |
1341 | return 0; | |
1342 | } | |
1343 | ||
1344 | /** | |
1345 | * register_sysctl_table - register a sysctl hierarchy | |
1346 | * @table: the top-level table structure | |
1347 | * @insert_at_head: whether the entry should be inserted in front or at the end | |
1348 | * | |
1349 | * Register a sysctl table hierarchy. @table should be a filled in ctl_table | |
1350 | * array. An entry with a ctl_name of 0 terminates the table. | |
1351 | * | |
1352 | * The members of the &ctl_table structure are used as follows: | |
1353 | * | |
1354 | * ctl_name - This is the numeric sysctl value used by sysctl(2). The number | |
1355 | * must be unique within that level of sysctl | |
1356 | * | |
1357 | * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not | |
1358 | * enter a sysctl file | |
1359 | * | |
1360 | * data - a pointer to data for use by proc_handler | |
1361 | * | |
1362 | * maxlen - the maximum size in bytes of the data | |
1363 | * | |
1364 | * mode - the file permissions for the /proc/sys file, and for sysctl(2) | |
1365 | * | |
1366 | * child - a pointer to the child sysctl table if this entry is a directory, or | |
1367 | * %NULL. | |
1368 | * | |
1369 | * proc_handler - the text handler routine (described below) | |
1370 | * | |
1371 | * strategy - the strategy routine (described below) | |
1372 | * | |
1373 | * de - for internal use by the sysctl routines | |
1374 | * | |
1375 | * extra1, extra2 - extra pointers usable by the proc handler routines | |
1376 | * | |
1377 | * Leaf nodes in the sysctl tree will be represented by a single file | |
1378 | * under /proc; non-leaf nodes will be represented by directories. | |
1379 | * | |
1380 | * sysctl(2) can automatically manage read and write requests through | |
1381 | * the sysctl table. The data and maxlen fields of the ctl_table | |
1382 | * struct enable minimal validation of the values being written to be | |
1383 | * performed, and the mode field allows minimal authentication. | |
1384 | * | |
1385 | * More sophisticated management can be enabled by the provision of a | |
1386 | * strategy routine with the table entry. This will be called before | |
1387 | * any automatic read or write of the data is performed. | |
1388 | * | |
1389 | * The strategy routine may return | |
1390 | * | |
1391 | * < 0 - Error occurred (error is passed to user process) | |
1392 | * | |
1393 | * 0 - OK - proceed with automatic read or write. | |
1394 | * | |
1395 | * > 0 - OK - read or write has been done by the strategy routine, so | |
1396 | * return immediately. | |
1397 | * | |
1398 | * There must be a proc_handler routine for any terminal nodes | |
1399 | * mirrored under /proc/sys (non-terminals are handled by a built-in | |
1400 | * directory handler). Several default handlers are available to | |
1401 | * cover common cases - | |
1402 | * | |
1403 | * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(), | |
1404 | * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(), | |
1405 | * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax() | |
1406 | * | |
1407 | * It is the handler's job to read the input buffer from user memory | |
1408 | * and process it. The handler should return 0 on success. | |
1409 | * | |
1410 | * This routine returns %NULL on a failure to register, and a pointer | |
1411 | * to the table header on success. | |
1412 | */ | |
1413 | struct ctl_table_header *register_sysctl_table(ctl_table * table, | |
1414 | int insert_at_head) | |
1415 | { | |
1416 | struct ctl_table_header *tmp; | |
1417 | tmp = kmalloc(sizeof(struct ctl_table_header), GFP_KERNEL); | |
1418 | if (!tmp) | |
1419 | return NULL; | |
1420 | tmp->ctl_table = table; | |
1421 | INIT_LIST_HEAD(&tmp->ctl_entry); | |
330d57fb AV |
1422 | tmp->used = 0; |
1423 | tmp->unregistering = NULL; | |
1424 | spin_lock(&sysctl_lock); | |
1da177e4 LT |
1425 | if (insert_at_head) |
1426 | list_add(&tmp->ctl_entry, &root_table_header.ctl_entry); | |
1427 | else | |
1428 | list_add_tail(&tmp->ctl_entry, &root_table_header.ctl_entry); | |
330d57fb | 1429 | spin_unlock(&sysctl_lock); |
1da177e4 | 1430 | #ifdef CONFIG_PROC_FS |
330d57fb | 1431 | register_proc_table(table, proc_sys_root, tmp); |
1da177e4 LT |
1432 | #endif |
1433 | return tmp; | |
1434 | } | |
1435 | ||
1436 | /** | |
1437 | * unregister_sysctl_table - unregister a sysctl table hierarchy | |
1438 | * @header: the header returned from register_sysctl_table | |
1439 | * | |
1440 | * Unregisters the sysctl table and all children. proc entries may not | |
1441 | * actually be removed until they are no longer used by anyone. | |
1442 | */ | |
1443 | void unregister_sysctl_table(struct ctl_table_header * header) | |
1444 | { | |
330d57fb AV |
1445 | might_sleep(); |
1446 | spin_lock(&sysctl_lock); | |
1447 | start_unregistering(header); | |
1da177e4 LT |
1448 | #ifdef CONFIG_PROC_FS |
1449 | unregister_proc_table(header->ctl_table, proc_sys_root); | |
1450 | #endif | |
330d57fb | 1451 | spin_unlock(&sysctl_lock); |
1da177e4 LT |
1452 | kfree(header); |
1453 | } | |
1454 | ||
1455 | /* | |
1456 | * /proc/sys support | |
1457 | */ | |
1458 | ||
1459 | #ifdef CONFIG_PROC_FS | |
1460 | ||
1461 | /* Scan the sysctl entries in table and add them all into /proc */ | |
330d57fb | 1462 | static void register_proc_table(ctl_table * table, struct proc_dir_entry *root, void *set) |
1da177e4 LT |
1463 | { |
1464 | struct proc_dir_entry *de; | |
1465 | int len; | |
1466 | mode_t mode; | |
1467 | ||
1468 | for (; table->ctl_name; table++) { | |
1469 | /* Can't do anything without a proc name. */ | |
1470 | if (!table->procname) | |
1471 | continue; | |
1472 | /* Maybe we can't do anything with it... */ | |
1473 | if (!table->proc_handler && !table->child) { | |
1474 | printk(KERN_WARNING "SYSCTL: Can't register %s\n", | |
1475 | table->procname); | |
1476 | continue; | |
1477 | } | |
1478 | ||
1479 | len = strlen(table->procname); | |
1480 | mode = table->mode; | |
1481 | ||
1482 | de = NULL; | |
1483 | if (table->proc_handler) | |
1484 | mode |= S_IFREG; | |
1485 | else { | |
1486 | mode |= S_IFDIR; | |
1487 | for (de = root->subdir; de; de = de->next) { | |
1488 | if (proc_match(len, table->procname, de)) | |
1489 | break; | |
1490 | } | |
1491 | /* If the subdir exists already, de is non-NULL */ | |
1492 | } | |
1493 | ||
1494 | if (!de) { | |
1495 | de = create_proc_entry(table->procname, mode, root); | |
1496 | if (!de) | |
1497 | continue; | |
330d57fb | 1498 | de->set = set; |
1da177e4 LT |
1499 | de->data = (void *) table; |
1500 | if (table->proc_handler) | |
1501 | de->proc_fops = &proc_sys_file_operations; | |
1502 | } | |
1503 | table->de = de; | |
1504 | if (de->mode & S_IFDIR) | |
330d57fb | 1505 | register_proc_table(table->child, de, set); |
1da177e4 LT |
1506 | } |
1507 | } | |
1508 | ||
1509 | /* | |
1510 | * Unregister a /proc sysctl table and any subdirectories. | |
1511 | */ | |
1512 | static void unregister_proc_table(ctl_table * table, struct proc_dir_entry *root) | |
1513 | { | |
1514 | struct proc_dir_entry *de; | |
1515 | for (; table->ctl_name; table++) { | |
1516 | if (!(de = table->de)) | |
1517 | continue; | |
1518 | if (de->mode & S_IFDIR) { | |
1519 | if (!table->child) { | |
1520 | printk (KERN_ALERT "Help - malformed sysctl tree on free\n"); | |
1521 | continue; | |
1522 | } | |
1523 | unregister_proc_table(table->child, de); | |
1524 | ||
1525 | /* Don't unregister directories which still have entries.. */ | |
1526 | if (de->subdir) | |
1527 | continue; | |
1528 | } | |
1529 | ||
330d57fb AV |
1530 | /* |
1531 | * In any case, mark the entry as goner; we'll keep it | |
1532 | * around if it's busy, but we'll know to do nothing with | |
1533 | * its fields. We are under sysctl_lock here. | |
1534 | */ | |
1535 | de->data = NULL; | |
1536 | ||
1da177e4 LT |
1537 | /* Don't unregister proc entries that are still being used.. */ |
1538 | if (atomic_read(&de->count)) | |
1539 | continue; | |
1540 | ||
1541 | table->de = NULL; | |
1542 | remove_proc_entry(table->procname, root); | |
1543 | } | |
1544 | } | |
1545 | ||
1546 | static ssize_t do_rw_proc(int write, struct file * file, char __user * buf, | |
1547 | size_t count, loff_t *ppos) | |
1548 | { | |
1549 | int op; | |
330d57fb | 1550 | struct proc_dir_entry *de = PDE(file->f_dentry->d_inode); |
1da177e4 LT |
1551 | struct ctl_table *table; |
1552 | size_t res; | |
330d57fb | 1553 | ssize_t error = -ENOTDIR; |
1da177e4 | 1554 | |
330d57fb AV |
1555 | spin_lock(&sysctl_lock); |
1556 | if (de && de->data && use_table(de->set)) { | |
1557 | /* | |
1558 | * at that point we know that sysctl was not unregistered | |
1559 | * and won't be until we finish | |
1560 | */ | |
1561 | spin_unlock(&sysctl_lock); | |
1562 | table = (struct ctl_table *) de->data; | |
1563 | if (!table || !table->proc_handler) | |
1564 | goto out; | |
1565 | error = -EPERM; | |
1566 | op = (write ? 002 : 004); | |
1567 | if (ctl_perm(table, op)) | |
1568 | goto out; | |
1569 | ||
1570 | /* careful: calling conventions are nasty here */ | |
1571 | res = count; | |
1572 | error = (*table->proc_handler)(table, write, file, | |
1573 | buf, &res, ppos); | |
1574 | if (!error) | |
1575 | error = res; | |
1576 | out: | |
1577 | spin_lock(&sysctl_lock); | |
1578 | unuse_table(de->set); | |
1579 | } | |
1580 | spin_unlock(&sysctl_lock); | |
1581 | return error; | |
1da177e4 LT |
1582 | } |
1583 | ||
1584 | static int proc_opensys(struct inode *inode, struct file *file) | |
1585 | { | |
1586 | if (file->f_mode & FMODE_WRITE) { | |
1587 | /* | |
1588 | * sysctl entries that are not writable, | |
1589 | * are _NOT_ writable, capabilities or not. | |
1590 | */ | |
1591 | if (!(inode->i_mode & S_IWUSR)) | |
1592 | return -EPERM; | |
1593 | } | |
1594 | ||
1595 | return 0; | |
1596 | } | |
1597 | ||
1598 | static ssize_t proc_readsys(struct file * file, char __user * buf, | |
1599 | size_t count, loff_t *ppos) | |
1600 | { | |
1601 | return do_rw_proc(0, file, buf, count, ppos); | |
1602 | } | |
1603 | ||
1604 | static ssize_t proc_writesys(struct file * file, const char __user * buf, | |
1605 | size_t count, loff_t *ppos) | |
1606 | { | |
1607 | return do_rw_proc(1, file, (char __user *) buf, count, ppos); | |
1608 | } | |
1609 | ||
1610 | /** | |
1611 | * proc_dostring - read a string sysctl | |
1612 | * @table: the sysctl table | |
1613 | * @write: %TRUE if this is a write to the sysctl file | |
1614 | * @filp: the file structure | |
1615 | * @buffer: the user buffer | |
1616 | * @lenp: the size of the user buffer | |
1617 | * @ppos: file position | |
1618 | * | |
1619 | * Reads/writes a string from/to the user buffer. If the kernel | |
1620 | * buffer provided is not large enough to hold the string, the | |
1621 | * string is truncated. The copied string is %NULL-terminated. | |
1622 | * If the string is being read by the user process, it is copied | |
1623 | * and a newline '\n' is added. It is truncated if the buffer is | |
1624 | * not large enough. | |
1625 | * | |
1626 | * Returns 0 on success. | |
1627 | */ | |
1628 | int proc_dostring(ctl_table *table, int write, struct file *filp, | |
1629 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
1630 | { | |
1631 | size_t len; | |
1632 | char __user *p; | |
1633 | char c; | |
1634 | ||
1635 | if (!table->data || !table->maxlen || !*lenp || | |
1636 | (*ppos && !write)) { | |
1637 | *lenp = 0; | |
1638 | return 0; | |
1639 | } | |
1640 | ||
1641 | if (write) { | |
1642 | len = 0; | |
1643 | p = buffer; | |
1644 | while (len < *lenp) { | |
1645 | if (get_user(c, p++)) | |
1646 | return -EFAULT; | |
1647 | if (c == 0 || c == '\n') | |
1648 | break; | |
1649 | len++; | |
1650 | } | |
1651 | if (len >= table->maxlen) | |
1652 | len = table->maxlen-1; | |
1653 | if(copy_from_user(table->data, buffer, len)) | |
1654 | return -EFAULT; | |
1655 | ((char *) table->data)[len] = 0; | |
1656 | *ppos += *lenp; | |
1657 | } else { | |
1658 | len = strlen(table->data); | |
1659 | if (len > table->maxlen) | |
1660 | len = table->maxlen; | |
1661 | if (len > *lenp) | |
1662 | len = *lenp; | |
1663 | if (len) | |
1664 | if(copy_to_user(buffer, table->data, len)) | |
1665 | return -EFAULT; | |
1666 | if (len < *lenp) { | |
1667 | if(put_user('\n', ((char __user *) buffer) + len)) | |
1668 | return -EFAULT; | |
1669 | len++; | |
1670 | } | |
1671 | *lenp = len; | |
1672 | *ppos += len; | |
1673 | } | |
1674 | return 0; | |
1675 | } | |
1676 | ||
1677 | /* | |
1678 | * Special case of dostring for the UTS structure. This has locks | |
1679 | * to observe. Should this be in kernel/sys.c ???? | |
1680 | */ | |
1681 | ||
1682 | static int proc_doutsstring(ctl_table *table, int write, struct file *filp, | |
1683 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
1684 | { | |
1685 | int r; | |
1686 | ||
1687 | if (!write) { | |
1688 | down_read(&uts_sem); | |
1689 | r=proc_dostring(table,0,filp,buffer,lenp, ppos); | |
1690 | up_read(&uts_sem); | |
1691 | } else { | |
1692 | down_write(&uts_sem); | |
1693 | r=proc_dostring(table,1,filp,buffer,lenp, ppos); | |
1694 | up_write(&uts_sem); | |
1695 | } | |
1696 | return r; | |
1697 | } | |
1698 | ||
1699 | static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp, | |
1700 | int *valp, | |
1701 | int write, void *data) | |
1702 | { | |
1703 | if (write) { | |
1704 | *valp = *negp ? -*lvalp : *lvalp; | |
1705 | } else { | |
1706 | int val = *valp; | |
1707 | if (val < 0) { | |
1708 | *negp = -1; | |
1709 | *lvalp = (unsigned long)-val; | |
1710 | } else { | |
1711 | *negp = 0; | |
1712 | *lvalp = (unsigned long)val; | |
1713 | } | |
1714 | } | |
1715 | return 0; | |
1716 | } | |
1717 | ||
1718 | static int do_proc_dointvec(ctl_table *table, int write, struct file *filp, | |
1719 | void __user *buffer, size_t *lenp, loff_t *ppos, | |
1720 | int (*conv)(int *negp, unsigned long *lvalp, int *valp, | |
1721 | int write, void *data), | |
1722 | void *data) | |
1723 | { | |
1724 | #define TMPBUFLEN 21 | |
1725 | int *i, vleft, first=1, neg, val; | |
1726 | unsigned long lval; | |
1727 | size_t left, len; | |
1728 | ||
1729 | char buf[TMPBUFLEN], *p; | |
1730 | char __user *s = buffer; | |
1731 | ||
1732 | if (!table->data || !table->maxlen || !*lenp || | |
1733 | (*ppos && !write)) { | |
1734 | *lenp = 0; | |
1735 | return 0; | |
1736 | } | |
1737 | ||
1738 | i = (int *) table->data; | |
1739 | vleft = table->maxlen / sizeof(*i); | |
1740 | left = *lenp; | |
1741 | ||
1742 | if (!conv) | |
1743 | conv = do_proc_dointvec_conv; | |
1744 | ||
1745 | for (; left && vleft--; i++, first=0) { | |
1746 | if (write) { | |
1747 | while (left) { | |
1748 | char c; | |
1749 | if (get_user(c, s)) | |
1750 | return -EFAULT; | |
1751 | if (!isspace(c)) | |
1752 | break; | |
1753 | left--; | |
1754 | s++; | |
1755 | } | |
1756 | if (!left) | |
1757 | break; | |
1758 | neg = 0; | |
1759 | len = left; | |
1760 | if (len > sizeof(buf) - 1) | |
1761 | len = sizeof(buf) - 1; | |
1762 | if (copy_from_user(buf, s, len)) | |
1763 | return -EFAULT; | |
1764 | buf[len] = 0; | |
1765 | p = buf; | |
1766 | if (*p == '-' && left > 1) { | |
1767 | neg = 1; | |
1768 | left--, p++; | |
1769 | } | |
1770 | if (*p < '0' || *p > '9') | |
1771 | break; | |
1772 | ||
1773 | lval = simple_strtoul(p, &p, 0); | |
1774 | ||
1775 | len = p-buf; | |
1776 | if ((len < left) && *p && !isspace(*p)) | |
1777 | break; | |
1778 | if (neg) | |
1779 | val = -val; | |
1780 | s += len; | |
1781 | left -= len; | |
1782 | ||
1783 | if (conv(&neg, &lval, i, 1, data)) | |
1784 | break; | |
1785 | } else { | |
1786 | p = buf; | |
1787 | if (!first) | |
1788 | *p++ = '\t'; | |
1789 | ||
1790 | if (conv(&neg, &lval, i, 0, data)) | |
1791 | break; | |
1792 | ||
1793 | sprintf(p, "%s%lu", neg ? "-" : "", lval); | |
1794 | len = strlen(buf); | |
1795 | if (len > left) | |
1796 | len = left; | |
1797 | if(copy_to_user(s, buf, len)) | |
1798 | return -EFAULT; | |
1799 | left -= len; | |
1800 | s += len; | |
1801 | } | |
1802 | } | |
1803 | ||
1804 | if (!write && !first && left) { | |
1805 | if(put_user('\n', s)) | |
1806 | return -EFAULT; | |
1807 | left--, s++; | |
1808 | } | |
1809 | if (write) { | |
1810 | while (left) { | |
1811 | char c; | |
1812 | if (get_user(c, s++)) | |
1813 | return -EFAULT; | |
1814 | if (!isspace(c)) | |
1815 | break; | |
1816 | left--; | |
1817 | } | |
1818 | } | |
1819 | if (write && first) | |
1820 | return -EINVAL; | |
1821 | *lenp -= left; | |
1822 | *ppos += *lenp; | |
1823 | return 0; | |
1824 | #undef TMPBUFLEN | |
1825 | } | |
1826 | ||
1827 | /** | |
1828 | * proc_dointvec - read a vector of integers | |
1829 | * @table: the sysctl table | |
1830 | * @write: %TRUE if this is a write to the sysctl file | |
1831 | * @filp: the file structure | |
1832 | * @buffer: the user buffer | |
1833 | * @lenp: the size of the user buffer | |
1834 | * @ppos: file position | |
1835 | * | |
1836 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer | |
1837 | * values from/to the user buffer, treated as an ASCII string. | |
1838 | * | |
1839 | * Returns 0 on success. | |
1840 | */ | |
1841 | int proc_dointvec(ctl_table *table, int write, struct file *filp, | |
1842 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
1843 | { | |
1844 | return do_proc_dointvec(table,write,filp,buffer,lenp,ppos, | |
1845 | NULL,NULL); | |
1846 | } | |
1847 | ||
1848 | #define OP_SET 0 | |
1849 | #define OP_AND 1 | |
1850 | #define OP_OR 2 | |
1851 | #define OP_MAX 3 | |
1852 | #define OP_MIN 4 | |
1853 | ||
1854 | static int do_proc_dointvec_bset_conv(int *negp, unsigned long *lvalp, | |
1855 | int *valp, | |
1856 | int write, void *data) | |
1857 | { | |
1858 | int op = *(int *)data; | |
1859 | if (write) { | |
1860 | int val = *negp ? -*lvalp : *lvalp; | |
1861 | switch(op) { | |
1862 | case OP_SET: *valp = val; break; | |
1863 | case OP_AND: *valp &= val; break; | |
1864 | case OP_OR: *valp |= val; break; | |
1865 | case OP_MAX: if(*valp < val) | |
1866 | *valp = val; | |
1867 | break; | |
1868 | case OP_MIN: if(*valp > val) | |
1869 | *valp = val; | |
1870 | break; | |
1871 | } | |
1872 | } else { | |
1873 | int val = *valp; | |
1874 | if (val < 0) { | |
1875 | *negp = -1; | |
1876 | *lvalp = (unsigned long)-val; | |
1877 | } else { | |
1878 | *negp = 0; | |
1879 | *lvalp = (unsigned long)val; | |
1880 | } | |
1881 | } | |
1882 | return 0; | |
1883 | } | |
1884 | ||
1885 | /* | |
1886 | * init may raise the set. | |
1887 | */ | |
1888 | ||
1889 | int proc_dointvec_bset(ctl_table *table, int write, struct file *filp, | |
1890 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
1891 | { | |
1892 | int op; | |
1893 | ||
1894 | if (!capable(CAP_SYS_MODULE)) { | |
1895 | return -EPERM; | |
1896 | } | |
1897 | ||
1898 | op = (current->pid == 1) ? OP_SET : OP_AND; | |
1899 | return do_proc_dointvec(table,write,filp,buffer,lenp,ppos, | |
1900 | do_proc_dointvec_bset_conv,&op); | |
1901 | } | |
1902 | ||
1903 | struct do_proc_dointvec_minmax_conv_param { | |
1904 | int *min; | |
1905 | int *max; | |
1906 | }; | |
1907 | ||
1908 | static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp, | |
1909 | int *valp, | |
1910 | int write, void *data) | |
1911 | { | |
1912 | struct do_proc_dointvec_minmax_conv_param *param = data; | |
1913 | if (write) { | |
1914 | int val = *negp ? -*lvalp : *lvalp; | |
1915 | if ((param->min && *param->min > val) || | |
1916 | (param->max && *param->max < val)) | |
1917 | return -EINVAL; | |
1918 | *valp = val; | |
1919 | } else { | |
1920 | int val = *valp; | |
1921 | if (val < 0) { | |
1922 | *negp = -1; | |
1923 | *lvalp = (unsigned long)-val; | |
1924 | } else { | |
1925 | *negp = 0; | |
1926 | *lvalp = (unsigned long)val; | |
1927 | } | |
1928 | } | |
1929 | return 0; | |
1930 | } | |
1931 | ||
1932 | /** | |
1933 | * proc_dointvec_minmax - read a vector of integers with min/max values | |
1934 | * @table: the sysctl table | |
1935 | * @write: %TRUE if this is a write to the sysctl file | |
1936 | * @filp: the file structure | |
1937 | * @buffer: the user buffer | |
1938 | * @lenp: the size of the user buffer | |
1939 | * @ppos: file position | |
1940 | * | |
1941 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer | |
1942 | * values from/to the user buffer, treated as an ASCII string. | |
1943 | * | |
1944 | * This routine will ensure the values are within the range specified by | |
1945 | * table->extra1 (min) and table->extra2 (max). | |
1946 | * | |
1947 | * Returns 0 on success. | |
1948 | */ | |
1949 | int proc_dointvec_minmax(ctl_table *table, int write, struct file *filp, | |
1950 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
1951 | { | |
1952 | struct do_proc_dointvec_minmax_conv_param param = { | |
1953 | .min = (int *) table->extra1, | |
1954 | .max = (int *) table->extra2, | |
1955 | }; | |
1956 | return do_proc_dointvec(table, write, filp, buffer, lenp, ppos, | |
1957 | do_proc_dointvec_minmax_conv, ¶m); | |
1958 | } | |
1959 | ||
1960 | static int do_proc_doulongvec_minmax(ctl_table *table, int write, | |
1961 | struct file *filp, | |
1962 | void __user *buffer, | |
1963 | size_t *lenp, loff_t *ppos, | |
1964 | unsigned long convmul, | |
1965 | unsigned long convdiv) | |
1966 | { | |
1967 | #define TMPBUFLEN 21 | |
1968 | unsigned long *i, *min, *max, val; | |
1969 | int vleft, first=1, neg; | |
1970 | size_t len, left; | |
1971 | char buf[TMPBUFLEN], *p; | |
1972 | char __user *s = buffer; | |
1973 | ||
1974 | if (!table->data || !table->maxlen || !*lenp || | |
1975 | (*ppos && !write)) { | |
1976 | *lenp = 0; | |
1977 | return 0; | |
1978 | } | |
1979 | ||
1980 | i = (unsigned long *) table->data; | |
1981 | min = (unsigned long *) table->extra1; | |
1982 | max = (unsigned long *) table->extra2; | |
1983 | vleft = table->maxlen / sizeof(unsigned long); | |
1984 | left = *lenp; | |
1985 | ||
1986 | for (; left && vleft--; i++, min++, max++, first=0) { | |
1987 | if (write) { | |
1988 | while (left) { | |
1989 | char c; | |
1990 | if (get_user(c, s)) | |
1991 | return -EFAULT; | |
1992 | if (!isspace(c)) | |
1993 | break; | |
1994 | left--; | |
1995 | s++; | |
1996 | } | |
1997 | if (!left) | |
1998 | break; | |
1999 | neg = 0; | |
2000 | len = left; | |
2001 | if (len > TMPBUFLEN-1) | |
2002 | len = TMPBUFLEN-1; | |
2003 | if (copy_from_user(buf, s, len)) | |
2004 | return -EFAULT; | |
2005 | buf[len] = 0; | |
2006 | p = buf; | |
2007 | if (*p == '-' && left > 1) { | |
2008 | neg = 1; | |
2009 | left--, p++; | |
2010 | } | |
2011 | if (*p < '0' || *p > '9') | |
2012 | break; | |
2013 | val = simple_strtoul(p, &p, 0) * convmul / convdiv ; | |
2014 | len = p-buf; | |
2015 | if ((len < left) && *p && !isspace(*p)) | |
2016 | break; | |
2017 | if (neg) | |
2018 | val = -val; | |
2019 | s += len; | |
2020 | left -= len; | |
2021 | ||
2022 | if(neg) | |
2023 | continue; | |
2024 | if ((min && val < *min) || (max && val > *max)) | |
2025 | continue; | |
2026 | *i = val; | |
2027 | } else { | |
2028 | p = buf; | |
2029 | if (!first) | |
2030 | *p++ = '\t'; | |
2031 | sprintf(p, "%lu", convdiv * (*i) / convmul); | |
2032 | len = strlen(buf); | |
2033 | if (len > left) | |
2034 | len = left; | |
2035 | if(copy_to_user(s, buf, len)) | |
2036 | return -EFAULT; | |
2037 | left -= len; | |
2038 | s += len; | |
2039 | } | |
2040 | } | |
2041 | ||
2042 | if (!write && !first && left) { | |
2043 | if(put_user('\n', s)) | |
2044 | return -EFAULT; | |
2045 | left--, s++; | |
2046 | } | |
2047 | if (write) { | |
2048 | while (left) { | |
2049 | char c; | |
2050 | if (get_user(c, s++)) | |
2051 | return -EFAULT; | |
2052 | if (!isspace(c)) | |
2053 | break; | |
2054 | left--; | |
2055 | } | |
2056 | } | |
2057 | if (write && first) | |
2058 | return -EINVAL; | |
2059 | *lenp -= left; | |
2060 | *ppos += *lenp; | |
2061 | return 0; | |
2062 | #undef TMPBUFLEN | |
2063 | } | |
2064 | ||
2065 | /** | |
2066 | * proc_doulongvec_minmax - read a vector of long integers with min/max values | |
2067 | * @table: the sysctl table | |
2068 | * @write: %TRUE if this is a write to the sysctl file | |
2069 | * @filp: the file structure | |
2070 | * @buffer: the user buffer | |
2071 | * @lenp: the size of the user buffer | |
2072 | * @ppos: file position | |
2073 | * | |
2074 | * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long | |
2075 | * values from/to the user buffer, treated as an ASCII string. | |
2076 | * | |
2077 | * This routine will ensure the values are within the range specified by | |
2078 | * table->extra1 (min) and table->extra2 (max). | |
2079 | * | |
2080 | * Returns 0 on success. | |
2081 | */ | |
2082 | int proc_doulongvec_minmax(ctl_table *table, int write, struct file *filp, | |
2083 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2084 | { | |
2085 | return do_proc_doulongvec_minmax(table, write, filp, buffer, lenp, ppos, 1l, 1l); | |
2086 | } | |
2087 | ||
2088 | /** | |
2089 | * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values | |
2090 | * @table: the sysctl table | |
2091 | * @write: %TRUE if this is a write to the sysctl file | |
2092 | * @filp: the file structure | |
2093 | * @buffer: the user buffer | |
2094 | * @lenp: the size of the user buffer | |
2095 | * @ppos: file position | |
2096 | * | |
2097 | * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long | |
2098 | * values from/to the user buffer, treated as an ASCII string. The values | |
2099 | * are treated as milliseconds, and converted to jiffies when they are stored. | |
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 | */ | |
2106 | int proc_doulongvec_ms_jiffies_minmax(ctl_table *table, int write, | |
2107 | struct file *filp, | |
2108 | void __user *buffer, | |
2109 | size_t *lenp, loff_t *ppos) | |
2110 | { | |
2111 | return do_proc_doulongvec_minmax(table, write, filp, buffer, | |
2112 | lenp, ppos, HZ, 1000l); | |
2113 | } | |
2114 | ||
2115 | ||
2116 | static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp, | |
2117 | int *valp, | |
2118 | int write, void *data) | |
2119 | { | |
2120 | if (write) { | |
cba9f33d BS |
2121 | if (*lvalp > LONG_MAX / HZ) |
2122 | return 1; | |
1da177e4 LT |
2123 | *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ); |
2124 | } else { | |
2125 | int val = *valp; | |
2126 | unsigned long lval; | |
2127 | if (val < 0) { | |
2128 | *negp = -1; | |
2129 | lval = (unsigned long)-val; | |
2130 | } else { | |
2131 | *negp = 0; | |
2132 | lval = (unsigned long)val; | |
2133 | } | |
2134 | *lvalp = lval / HZ; | |
2135 | } | |
2136 | return 0; | |
2137 | } | |
2138 | ||
2139 | static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp, | |
2140 | int *valp, | |
2141 | int write, void *data) | |
2142 | { | |
2143 | if (write) { | |
cba9f33d BS |
2144 | if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ) |
2145 | return 1; | |
1da177e4 LT |
2146 | *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp); |
2147 | } else { | |
2148 | int val = *valp; | |
2149 | unsigned long lval; | |
2150 | if (val < 0) { | |
2151 | *negp = -1; | |
2152 | lval = (unsigned long)-val; | |
2153 | } else { | |
2154 | *negp = 0; | |
2155 | lval = (unsigned long)val; | |
2156 | } | |
2157 | *lvalp = jiffies_to_clock_t(lval); | |
2158 | } | |
2159 | return 0; | |
2160 | } | |
2161 | ||
2162 | static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp, | |
2163 | int *valp, | |
2164 | int write, void *data) | |
2165 | { | |
2166 | if (write) { | |
2167 | *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp); | |
2168 | } else { | |
2169 | int val = *valp; | |
2170 | unsigned long lval; | |
2171 | if (val < 0) { | |
2172 | *negp = -1; | |
2173 | lval = (unsigned long)-val; | |
2174 | } else { | |
2175 | *negp = 0; | |
2176 | lval = (unsigned long)val; | |
2177 | } | |
2178 | *lvalp = jiffies_to_msecs(lval); | |
2179 | } | |
2180 | return 0; | |
2181 | } | |
2182 | ||
2183 | /** | |
2184 | * proc_dointvec_jiffies - read a vector of integers as seconds | |
2185 | * @table: the sysctl table | |
2186 | * @write: %TRUE if this is a write to the sysctl file | |
2187 | * @filp: the file structure | |
2188 | * @buffer: the user buffer | |
2189 | * @lenp: the size of the user buffer | |
2190 | * @ppos: file position | |
2191 | * | |
2192 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer | |
2193 | * values from/to the user buffer, treated as an ASCII string. | |
2194 | * The values read are assumed to be in seconds, and are converted into | |
2195 | * jiffies. | |
2196 | * | |
2197 | * Returns 0 on success. | |
2198 | */ | |
2199 | int proc_dointvec_jiffies(ctl_table *table, int write, struct file *filp, | |
2200 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2201 | { | |
2202 | return do_proc_dointvec(table,write,filp,buffer,lenp,ppos, | |
2203 | do_proc_dointvec_jiffies_conv,NULL); | |
2204 | } | |
2205 | ||
2206 | /** | |
2207 | * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds | |
2208 | * @table: the sysctl table | |
2209 | * @write: %TRUE if this is a write to the sysctl file | |
2210 | * @filp: the file structure | |
2211 | * @buffer: the user buffer | |
2212 | * @lenp: the size of the user buffer | |
1e5d5331 | 2213 | * @ppos: pointer to the file position |
1da177e4 LT |
2214 | * |
2215 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer | |
2216 | * values from/to the user buffer, treated as an ASCII string. | |
2217 | * The values read are assumed to be in 1/USER_HZ seconds, and | |
2218 | * are converted into jiffies. | |
2219 | * | |
2220 | * Returns 0 on success. | |
2221 | */ | |
2222 | int proc_dointvec_userhz_jiffies(ctl_table *table, int write, struct file *filp, | |
2223 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2224 | { | |
2225 | return do_proc_dointvec(table,write,filp,buffer,lenp,ppos, | |
2226 | do_proc_dointvec_userhz_jiffies_conv,NULL); | |
2227 | } | |
2228 | ||
2229 | /** | |
2230 | * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds | |
2231 | * @table: the sysctl table | |
2232 | * @write: %TRUE if this is a write to the sysctl file | |
2233 | * @filp: the file structure | |
2234 | * @buffer: the user buffer | |
2235 | * @lenp: the size of the user buffer | |
67be2dd1 MW |
2236 | * @ppos: file position |
2237 | * @ppos: the current position in the file | |
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 1/1000 seconds, and | |
2242 | * are converted into jiffies. | |
2243 | * | |
2244 | * Returns 0 on success. | |
2245 | */ | |
2246 | int proc_dointvec_ms_jiffies(ctl_table *table, int write, struct file *filp, | |
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_ms_jiffies_conv, NULL); | |
2251 | } | |
2252 | ||
2253 | #else /* CONFIG_PROC_FS */ | |
2254 | ||
2255 | int proc_dostring(ctl_table *table, int write, struct file *filp, | |
2256 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2257 | { | |
2258 | return -ENOSYS; | |
2259 | } | |
2260 | ||
2261 | static int proc_doutsstring(ctl_table *table, int write, struct file *filp, | |
2262 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2263 | { | |
2264 | return -ENOSYS; | |
2265 | } | |
2266 | ||
2267 | int proc_dointvec(ctl_table *table, int write, struct file *filp, | |
2268 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2269 | { | |
2270 | return -ENOSYS; | |
2271 | } | |
2272 | ||
2273 | int proc_dointvec_bset(ctl_table *table, int write, struct file *filp, | |
2274 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2275 | { | |
2276 | return -ENOSYS; | |
2277 | } | |
2278 | ||
2279 | int proc_dointvec_minmax(ctl_table *table, int write, struct file *filp, | |
2280 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2281 | { | |
2282 | return -ENOSYS; | |
2283 | } | |
2284 | ||
2285 | int proc_dointvec_jiffies(ctl_table *table, int write, struct file *filp, | |
2286 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2287 | { | |
2288 | return -ENOSYS; | |
2289 | } | |
2290 | ||
2291 | int proc_dointvec_userhz_jiffies(ctl_table *table, int write, struct file *filp, | |
2292 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2293 | { | |
2294 | return -ENOSYS; | |
2295 | } | |
2296 | ||
2297 | int proc_dointvec_ms_jiffies(ctl_table *table, int write, struct file *filp, | |
2298 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2299 | { | |
2300 | return -ENOSYS; | |
2301 | } | |
2302 | ||
2303 | int proc_doulongvec_minmax(ctl_table *table, int write, struct file *filp, | |
2304 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2305 | { | |
2306 | return -ENOSYS; | |
2307 | } | |
2308 | ||
2309 | int proc_doulongvec_ms_jiffies_minmax(ctl_table *table, int write, | |
2310 | struct file *filp, | |
2311 | void __user *buffer, | |
2312 | size_t *lenp, loff_t *ppos) | |
2313 | { | |
2314 | return -ENOSYS; | |
2315 | } | |
2316 | ||
2317 | ||
2318 | #endif /* CONFIG_PROC_FS */ | |
2319 | ||
2320 | ||
2321 | /* | |
2322 | * General sysctl support routines | |
2323 | */ | |
2324 | ||
2325 | /* The generic string strategy routine: */ | |
2326 | int sysctl_string(ctl_table *table, int __user *name, int nlen, | |
2327 | void __user *oldval, size_t __user *oldlenp, | |
2328 | void __user *newval, size_t newlen, void **context) | |
2329 | { | |
1da177e4 LT |
2330 | if (!table->data || !table->maxlen) |
2331 | return -ENOTDIR; | |
2332 | ||
2333 | if (oldval && oldlenp) { | |
de9e007d LT |
2334 | size_t bufsize; |
2335 | if (get_user(bufsize, oldlenp)) | |
1da177e4 | 2336 | return -EFAULT; |
de9e007d LT |
2337 | if (bufsize) { |
2338 | size_t len = strlen(table->data), copied; | |
2339 | ||
2340 | /* This shouldn't trigger for a well-formed sysctl */ | |
2341 | if (len > table->maxlen) | |
1da177e4 | 2342 | len = table->maxlen; |
de9e007d LT |
2343 | |
2344 | /* Copy up to a max of bufsize-1 bytes of the string */ | |
2345 | copied = (len >= bufsize) ? bufsize - 1 : len; | |
2346 | ||
2347 | if (copy_to_user(oldval, table->data, copied) || | |
2348 | put_user(0, (char __user *)(oldval + copied))) | |
1da177e4 | 2349 | return -EFAULT; |
de9e007d | 2350 | if (put_user(len, oldlenp)) |
1da177e4 LT |
2351 | return -EFAULT; |
2352 | } | |
2353 | } | |
2354 | if (newval && newlen) { | |
de9e007d | 2355 | size_t len = newlen; |
1da177e4 LT |
2356 | if (len > table->maxlen) |
2357 | len = table->maxlen; | |
2358 | if(copy_from_user(table->data, newval, len)) | |
2359 | return -EFAULT; | |
2360 | if (len == table->maxlen) | |
2361 | len--; | |
2362 | ((char *) table->data)[len] = 0; | |
2363 | } | |
82c9df82 | 2364 | return 1; |
1da177e4 LT |
2365 | } |
2366 | ||
2367 | /* | |
2368 | * This function makes sure that all of the integers in the vector | |
2369 | * are between the minimum and maximum values given in the arrays | |
2370 | * table->extra1 and table->extra2, respectively. | |
2371 | */ | |
2372 | int sysctl_intvec(ctl_table *table, int __user *name, int nlen, | |
2373 | void __user *oldval, size_t __user *oldlenp, | |
2374 | void __user *newval, size_t newlen, void **context) | |
2375 | { | |
2376 | ||
2377 | if (newval && newlen) { | |
2378 | int __user *vec = (int __user *) newval; | |
2379 | int *min = (int *) table->extra1; | |
2380 | int *max = (int *) table->extra2; | |
2381 | size_t length; | |
2382 | int i; | |
2383 | ||
2384 | if (newlen % sizeof(int) != 0) | |
2385 | return -EINVAL; | |
2386 | ||
2387 | if (!table->extra1 && !table->extra2) | |
2388 | return 0; | |
2389 | ||
2390 | if (newlen > table->maxlen) | |
2391 | newlen = table->maxlen; | |
2392 | length = newlen / sizeof(int); | |
2393 | ||
2394 | for (i = 0; i < length; i++) { | |
2395 | int value; | |
2396 | if (get_user(value, vec + i)) | |
2397 | return -EFAULT; | |
2398 | if (min && value < min[i]) | |
2399 | return -EINVAL; | |
2400 | if (max && value > max[i]) | |
2401 | return -EINVAL; | |
2402 | } | |
2403 | } | |
2404 | return 0; | |
2405 | } | |
2406 | ||
2407 | /* Strategy function to convert jiffies to seconds */ | |
2408 | int sysctl_jiffies(ctl_table *table, int __user *name, int nlen, | |
2409 | void __user *oldval, size_t __user *oldlenp, | |
2410 | void __user *newval, size_t newlen, void **context) | |
2411 | { | |
2412 | if (oldval) { | |
2413 | size_t olen; | |
2414 | if (oldlenp) { | |
2415 | if (get_user(olen, oldlenp)) | |
2416 | return -EFAULT; | |
2417 | if (olen!=sizeof(int)) | |
2418 | return -EINVAL; | |
2419 | } | |
2420 | if (put_user(*(int *)(table->data)/HZ, (int __user *)oldval) || | |
2421 | (oldlenp && put_user(sizeof(int),oldlenp))) | |
2422 | return -EFAULT; | |
2423 | } | |
2424 | if (newval && newlen) { | |
2425 | int new; | |
2426 | if (newlen != sizeof(int)) | |
2427 | return -EINVAL; | |
2428 | if (get_user(new, (int __user *)newval)) | |
2429 | return -EFAULT; | |
2430 | *(int *)(table->data) = new*HZ; | |
2431 | } | |
2432 | return 1; | |
2433 | } | |
2434 | ||
2435 | /* Strategy function to convert jiffies to seconds */ | |
2436 | int sysctl_ms_jiffies(ctl_table *table, int __user *name, int nlen, | |
2437 | void __user *oldval, size_t __user *oldlenp, | |
2438 | void __user *newval, size_t newlen, void **context) | |
2439 | { | |
2440 | if (oldval) { | |
2441 | size_t olen; | |
2442 | if (oldlenp) { | |
2443 | if (get_user(olen, oldlenp)) | |
2444 | return -EFAULT; | |
2445 | if (olen!=sizeof(int)) | |
2446 | return -EINVAL; | |
2447 | } | |
2448 | if (put_user(jiffies_to_msecs(*(int *)(table->data)), (int __user *)oldval) || | |
2449 | (oldlenp && put_user(sizeof(int),oldlenp))) | |
2450 | return -EFAULT; | |
2451 | } | |
2452 | if (newval && newlen) { | |
2453 | int new; | |
2454 | if (newlen != sizeof(int)) | |
2455 | return -EINVAL; | |
2456 | if (get_user(new, (int __user *)newval)) | |
2457 | return -EFAULT; | |
2458 | *(int *)(table->data) = msecs_to_jiffies(new); | |
2459 | } | |
2460 | return 1; | |
2461 | } | |
2462 | ||
2463 | #else /* CONFIG_SYSCTL */ | |
2464 | ||
2465 | ||
2466 | asmlinkage long sys_sysctl(struct __sysctl_args __user *args) | |
2467 | { | |
2468 | return -ENOSYS; | |
2469 | } | |
2470 | ||
2471 | int sysctl_string(ctl_table *table, int __user *name, int nlen, | |
2472 | void __user *oldval, size_t __user *oldlenp, | |
2473 | void __user *newval, size_t newlen, void **context) | |
2474 | { | |
2475 | return -ENOSYS; | |
2476 | } | |
2477 | ||
2478 | int sysctl_intvec(ctl_table *table, int __user *name, int nlen, | |
2479 | void __user *oldval, size_t __user *oldlenp, | |
2480 | void __user *newval, size_t newlen, void **context) | |
2481 | { | |
2482 | return -ENOSYS; | |
2483 | } | |
2484 | ||
2485 | int sysctl_jiffies(ctl_table *table, int __user *name, int nlen, | |
2486 | void __user *oldval, size_t __user *oldlenp, | |
2487 | void __user *newval, size_t newlen, void **context) | |
2488 | { | |
2489 | return -ENOSYS; | |
2490 | } | |
2491 | ||
2492 | int sysctl_ms_jiffies(ctl_table *table, int __user *name, int nlen, | |
2493 | void __user *oldval, size_t __user *oldlenp, | |
2494 | void __user *newval, size_t newlen, void **context) | |
2495 | { | |
2496 | return -ENOSYS; | |
2497 | } | |
2498 | ||
2499 | int proc_dostring(ctl_table *table, int write, struct file *filp, | |
2500 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2501 | { | |
2502 | return -ENOSYS; | |
2503 | } | |
2504 | ||
2505 | int proc_dointvec(ctl_table *table, int write, struct file *filp, | |
2506 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2507 | { | |
2508 | return -ENOSYS; | |
2509 | } | |
2510 | ||
2511 | int proc_dointvec_bset(ctl_table *table, int write, struct file *filp, | |
2512 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2513 | { | |
2514 | return -ENOSYS; | |
2515 | } | |
2516 | ||
2517 | int proc_dointvec_minmax(ctl_table *table, int write, struct file *filp, | |
2518 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2519 | { | |
2520 | return -ENOSYS; | |
2521 | } | |
2522 | ||
2523 | int proc_dointvec_jiffies(ctl_table *table, int write, struct file *filp, | |
2524 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2525 | { | |
2526 | return -ENOSYS; | |
2527 | } | |
2528 | ||
2529 | int proc_dointvec_userhz_jiffies(ctl_table *table, int write, struct file *filp, | |
2530 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2531 | { | |
2532 | return -ENOSYS; | |
2533 | } | |
2534 | ||
2535 | int proc_dointvec_ms_jiffies(ctl_table *table, int write, struct file *filp, | |
2536 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2537 | { | |
2538 | return -ENOSYS; | |
2539 | } | |
2540 | ||
2541 | int proc_doulongvec_minmax(ctl_table *table, int write, struct file *filp, | |
2542 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2543 | { | |
2544 | return -ENOSYS; | |
2545 | } | |
2546 | ||
2547 | int proc_doulongvec_ms_jiffies_minmax(ctl_table *table, int write, | |
2548 | struct file *filp, | |
2549 | void __user *buffer, | |
2550 | size_t *lenp, loff_t *ppos) | |
2551 | { | |
2552 | return -ENOSYS; | |
2553 | } | |
2554 | ||
2555 | struct ctl_table_header * register_sysctl_table(ctl_table * table, | |
2556 | int insert_at_head) | |
2557 | { | |
2558 | return NULL; | |
2559 | } | |
2560 | ||
2561 | void unregister_sysctl_table(struct ctl_table_header * table) | |
2562 | { | |
2563 | } | |
2564 | ||
2565 | #endif /* CONFIG_SYSCTL */ | |
2566 | ||
2567 | /* | |
2568 | * No sense putting this after each symbol definition, twice, | |
2569 | * exception granted :-) | |
2570 | */ | |
2571 | EXPORT_SYMBOL(proc_dointvec); | |
2572 | EXPORT_SYMBOL(proc_dointvec_jiffies); | |
2573 | EXPORT_SYMBOL(proc_dointvec_minmax); | |
2574 | EXPORT_SYMBOL(proc_dointvec_userhz_jiffies); | |
2575 | EXPORT_SYMBOL(proc_dointvec_ms_jiffies); | |
2576 | EXPORT_SYMBOL(proc_dostring); | |
2577 | EXPORT_SYMBOL(proc_doulongvec_minmax); | |
2578 | EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax); | |
2579 | EXPORT_SYMBOL(register_sysctl_table); | |
2580 | EXPORT_SYMBOL(sysctl_intvec); | |
2581 | EXPORT_SYMBOL(sysctl_jiffies); | |
2582 | EXPORT_SYMBOL(sysctl_ms_jiffies); | |
2583 | EXPORT_SYMBOL(sysctl_string); | |
2584 | EXPORT_SYMBOL(unregister_sysctl_table); |