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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 | ||
21 | #include <linux/config.h> | |
22 | #include <linux/module.h> | |
23 | #include <linux/mm.h> | |
24 | #include <linux/swap.h> | |
25 | #include <linux/slab.h> | |
26 | #include <linux/sysctl.h> | |
27 | #include <linux/proc_fs.h> | |
c59ede7b | 28 | #include <linux/capability.h> |
1da177e4 LT |
29 | #include <linux/ctype.h> |
30 | #include <linux/utsname.h> | |
31 | #include <linux/capability.h> | |
32 | #include <linux/smp_lock.h> | |
33 | #include <linux/init.h> | |
34 | #include <linux/kernel.h> | |
0296b228 | 35 | #include <linux/kobject.h> |
20380731 | 36 | #include <linux/net.h> |
1da177e4 LT |
37 | #include <linux/sysrq.h> |
38 | #include <linux/highuid.h> | |
39 | #include <linux/writeback.h> | |
40 | #include <linux/hugetlb.h> | |
41 | #include <linux/security.h> | |
42 | #include <linux/initrd.h> | |
43 | #include <linux/times.h> | |
44 | #include <linux/limits.h> | |
45 | #include <linux/dcache.h> | |
46 | #include <linux/syscalls.h> | |
47 | ||
48 | #include <asm/uaccess.h> | |
49 | #include <asm/processor.h> | |
50 | ||
51 | #ifdef CONFIG_ROOT_NFS | |
52 | #include <linux/nfs_fs.h> | |
53 | #endif | |
54 | ||
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; | |
61 | extern int max_threads; | |
62 | extern int sysrq_enabled; | |
63 | extern int core_uses_pid; | |
d6e71144 | 64 | extern int suid_dumpable; |
1da177e4 LT |
65 | extern char core_pattern[]; |
66 | extern int cad_pid; | |
67 | extern int pid_max; | |
68 | extern int min_free_kbytes; | |
69 | extern int printk_ratelimit_jiffies; | |
70 | extern int printk_ratelimit_burst; | |
71 | extern int pid_max_min, pid_max_max; | |
9d0243bc | 72 | extern int sysctl_drop_caches; |
8ad4b1fb | 73 | extern int percpu_pagelist_fraction; |
1da177e4 LT |
74 | |
75 | #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86) | |
76 | int unknown_nmi_panic; | |
77 | extern int proc_unknown_nmi_panic(ctl_table *, int, struct file *, | |
78 | void __user *, size_t *, loff_t *); | |
79 | #endif | |
80 | ||
81 | /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */ | |
82 | static int maxolduid = 65535; | |
83 | static int minolduid; | |
8ad4b1fb | 84 | static int min_percpu_pagelist_fract = 8; |
1da177e4 LT |
85 | |
86 | static int ngroups_max = NGROUPS_MAX; | |
87 | ||
88 | #ifdef CONFIG_KMOD | |
89 | extern char modprobe_path[]; | |
90 | #endif | |
1da177e4 LT |
91 | #ifdef CONFIG_CHR_DEV_SG |
92 | extern int sg_big_buff; | |
93 | #endif | |
94 | #ifdef CONFIG_SYSVIPC | |
95 | extern size_t shm_ctlmax; | |
96 | extern size_t shm_ctlall; | |
97 | extern int shm_ctlmni; | |
98 | extern int msg_ctlmax; | |
99 | extern int msg_ctlmnb; | |
100 | extern int msg_ctlmni; | |
101 | extern int sem_ctls[]; | |
102 | #endif | |
103 | ||
104 | #ifdef __sparc__ | |
105 | extern char reboot_command []; | |
106 | extern int stop_a_enabled; | |
107 | extern int scons_pwroff; | |
108 | #endif | |
109 | ||
110 | #ifdef __hppa__ | |
111 | extern int pwrsw_enabled; | |
112 | extern int unaligned_enabled; | |
113 | #endif | |
114 | ||
347a8dc3 | 115 | #ifdef CONFIG_S390 |
1da177e4 LT |
116 | #ifdef CONFIG_MATHEMU |
117 | extern int sysctl_ieee_emulation_warnings; | |
118 | #endif | |
119 | extern int sysctl_userprocess_debug; | |
951f22d5 | 120 | extern int spin_retry; |
1da177e4 LT |
121 | #endif |
122 | ||
123 | extern int sysctl_hz_timer; | |
124 | ||
125 | #ifdef CONFIG_BSD_PROCESS_ACCT | |
126 | extern int acct_parm[]; | |
127 | #endif | |
128 | ||
1da177e4 LT |
129 | static int parse_table(int __user *, int, void __user *, size_t __user *, void __user *, size_t, |
130 | ctl_table *, void **); | |
131 | static int proc_doutsstring(ctl_table *table, int write, struct file *filp, | |
132 | void __user *buffer, size_t *lenp, loff_t *ppos); | |
133 | ||
134 | static ctl_table root_table[]; | |
135 | static struct ctl_table_header root_table_header = | |
136 | { root_table, LIST_HEAD_INIT(root_table_header.ctl_entry) }; | |
137 | ||
138 | static ctl_table kern_table[]; | |
139 | static ctl_table vm_table[]; | |
1da177e4 LT |
140 | static ctl_table proc_table[]; |
141 | static ctl_table fs_table[]; | |
142 | static ctl_table debug_table[]; | |
143 | static ctl_table dev_table[]; | |
144 | extern ctl_table random_table[]; | |
145 | #ifdef CONFIG_UNIX98_PTYS | |
146 | extern ctl_table pty_table[]; | |
147 | #endif | |
0399cb08 RL |
148 | #ifdef CONFIG_INOTIFY |
149 | extern ctl_table inotify_table[]; | |
150 | #endif | |
1da177e4 LT |
151 | |
152 | #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT | |
153 | int sysctl_legacy_va_layout; | |
154 | #endif | |
155 | ||
156 | /* /proc declarations: */ | |
157 | ||
158 | #ifdef CONFIG_PROC_FS | |
159 | ||
160 | static ssize_t proc_readsys(struct file *, char __user *, size_t, loff_t *); | |
161 | static ssize_t proc_writesys(struct file *, const char __user *, size_t, loff_t *); | |
162 | static int proc_opensys(struct inode *, struct file *); | |
163 | ||
164 | struct file_operations proc_sys_file_operations = { | |
165 | .open = proc_opensys, | |
166 | .read = proc_readsys, | |
167 | .write = proc_writesys, | |
168 | }; | |
169 | ||
170 | extern struct proc_dir_entry *proc_sys_root; | |
171 | ||
330d57fb | 172 | static void register_proc_table(ctl_table *, struct proc_dir_entry *, void *); |
1da177e4 LT |
173 | static void unregister_proc_table(ctl_table *, struct proc_dir_entry *); |
174 | #endif | |
175 | ||
176 | /* The default sysctl tables: */ | |
177 | ||
178 | static ctl_table root_table[] = { | |
179 | { | |
180 | .ctl_name = CTL_KERN, | |
181 | .procname = "kernel", | |
182 | .mode = 0555, | |
183 | .child = kern_table, | |
184 | }, | |
185 | { | |
186 | .ctl_name = CTL_VM, | |
187 | .procname = "vm", | |
188 | .mode = 0555, | |
189 | .child = vm_table, | |
190 | }, | |
191 | #ifdef CONFIG_NET | |
192 | { | |
193 | .ctl_name = CTL_NET, | |
194 | .procname = "net", | |
195 | .mode = 0555, | |
196 | .child = net_table, | |
197 | }, | |
198 | #endif | |
199 | { | |
200 | .ctl_name = CTL_PROC, | |
201 | .procname = "proc", | |
202 | .mode = 0555, | |
203 | .child = proc_table, | |
204 | }, | |
205 | { | |
206 | .ctl_name = CTL_FS, | |
207 | .procname = "fs", | |
208 | .mode = 0555, | |
209 | .child = fs_table, | |
210 | }, | |
211 | { | |
212 | .ctl_name = CTL_DEBUG, | |
213 | .procname = "debug", | |
214 | .mode = 0555, | |
215 | .child = debug_table, | |
216 | }, | |
217 | { | |
218 | .ctl_name = CTL_DEV, | |
219 | .procname = "dev", | |
220 | .mode = 0555, | |
221 | .child = dev_table, | |
222 | }, | |
0eeca283 | 223 | |
1da177e4 LT |
224 | { .ctl_name = 0 } |
225 | }; | |
226 | ||
227 | static ctl_table kern_table[] = { | |
228 | { | |
229 | .ctl_name = KERN_OSTYPE, | |
230 | .procname = "ostype", | |
231 | .data = system_utsname.sysname, | |
232 | .maxlen = sizeof(system_utsname.sysname), | |
233 | .mode = 0444, | |
234 | .proc_handler = &proc_doutsstring, | |
235 | .strategy = &sysctl_string, | |
236 | }, | |
237 | { | |
238 | .ctl_name = KERN_OSRELEASE, | |
239 | .procname = "osrelease", | |
240 | .data = system_utsname.release, | |
241 | .maxlen = sizeof(system_utsname.release), | |
242 | .mode = 0444, | |
243 | .proc_handler = &proc_doutsstring, | |
244 | .strategy = &sysctl_string, | |
245 | }, | |
246 | { | |
247 | .ctl_name = KERN_VERSION, | |
248 | .procname = "version", | |
249 | .data = system_utsname.version, | |
250 | .maxlen = sizeof(system_utsname.version), | |
251 | .mode = 0444, | |
252 | .proc_handler = &proc_doutsstring, | |
253 | .strategy = &sysctl_string, | |
254 | }, | |
255 | { | |
256 | .ctl_name = KERN_NODENAME, | |
257 | .procname = "hostname", | |
258 | .data = system_utsname.nodename, | |
259 | .maxlen = sizeof(system_utsname.nodename), | |
260 | .mode = 0644, | |
261 | .proc_handler = &proc_doutsstring, | |
262 | .strategy = &sysctl_string, | |
263 | }, | |
264 | { | |
265 | .ctl_name = KERN_DOMAINNAME, | |
266 | .procname = "domainname", | |
267 | .data = system_utsname.domainname, | |
268 | .maxlen = sizeof(system_utsname.domainname), | |
269 | .mode = 0644, | |
270 | .proc_handler = &proc_doutsstring, | |
271 | .strategy = &sysctl_string, | |
272 | }, | |
273 | { | |
274 | .ctl_name = KERN_PANIC, | |
275 | .procname = "panic", | |
276 | .data = &panic_timeout, | |
277 | .maxlen = sizeof(int), | |
278 | .mode = 0644, | |
279 | .proc_handler = &proc_dointvec, | |
280 | }, | |
281 | { | |
282 | .ctl_name = KERN_CORE_USES_PID, | |
283 | .procname = "core_uses_pid", | |
284 | .data = &core_uses_pid, | |
285 | .maxlen = sizeof(int), | |
286 | .mode = 0644, | |
287 | .proc_handler = &proc_dointvec, | |
288 | }, | |
289 | { | |
290 | .ctl_name = KERN_CORE_PATTERN, | |
291 | .procname = "core_pattern", | |
292 | .data = core_pattern, | |
293 | .maxlen = 64, | |
294 | .mode = 0644, | |
295 | .proc_handler = &proc_dostring, | |
296 | .strategy = &sysctl_string, | |
297 | }, | |
298 | { | |
299 | .ctl_name = KERN_TAINTED, | |
300 | .procname = "tainted", | |
301 | .data = &tainted, | |
302 | .maxlen = sizeof(int), | |
303 | .mode = 0444, | |
304 | .proc_handler = &proc_dointvec, | |
305 | }, | |
306 | { | |
307 | .ctl_name = KERN_CAP_BSET, | |
308 | .procname = "cap-bound", | |
309 | .data = &cap_bset, | |
310 | .maxlen = sizeof(kernel_cap_t), | |
311 | .mode = 0600, | |
312 | .proc_handler = &proc_dointvec_bset, | |
313 | }, | |
314 | #ifdef CONFIG_BLK_DEV_INITRD | |
315 | { | |
316 | .ctl_name = KERN_REALROOTDEV, | |
317 | .procname = "real-root-dev", | |
318 | .data = &real_root_dev, | |
319 | .maxlen = sizeof(int), | |
320 | .mode = 0644, | |
321 | .proc_handler = &proc_dointvec, | |
322 | }, | |
323 | #endif | |
324 | #ifdef __sparc__ | |
325 | { | |
326 | .ctl_name = KERN_SPARC_REBOOT, | |
327 | .procname = "reboot-cmd", | |
328 | .data = reboot_command, | |
329 | .maxlen = 256, | |
330 | .mode = 0644, | |
331 | .proc_handler = &proc_dostring, | |
332 | .strategy = &sysctl_string, | |
333 | }, | |
334 | { | |
335 | .ctl_name = KERN_SPARC_STOP_A, | |
336 | .procname = "stop-a", | |
337 | .data = &stop_a_enabled, | |
338 | .maxlen = sizeof (int), | |
339 | .mode = 0644, | |
340 | .proc_handler = &proc_dointvec, | |
341 | }, | |
342 | { | |
343 | .ctl_name = KERN_SPARC_SCONS_PWROFF, | |
344 | .procname = "scons-poweroff", | |
345 | .data = &scons_pwroff, | |
346 | .maxlen = sizeof (int), | |
347 | .mode = 0644, | |
348 | .proc_handler = &proc_dointvec, | |
349 | }, | |
350 | #endif | |
351 | #ifdef __hppa__ | |
352 | { | |
353 | .ctl_name = KERN_HPPA_PWRSW, | |
354 | .procname = "soft-power", | |
355 | .data = &pwrsw_enabled, | |
356 | .maxlen = sizeof (int), | |
357 | .mode = 0644, | |
358 | .proc_handler = &proc_dointvec, | |
359 | }, | |
360 | { | |
361 | .ctl_name = KERN_HPPA_UNALIGNED, | |
362 | .procname = "unaligned-trap", | |
363 | .data = &unaligned_enabled, | |
364 | .maxlen = sizeof (int), | |
365 | .mode = 0644, | |
366 | .proc_handler = &proc_dointvec, | |
367 | }, | |
368 | #endif | |
369 | { | |
370 | .ctl_name = KERN_CTLALTDEL, | |
371 | .procname = "ctrl-alt-del", | |
372 | .data = &C_A_D, | |
373 | .maxlen = sizeof(int), | |
374 | .mode = 0644, | |
375 | .proc_handler = &proc_dointvec, | |
376 | }, | |
377 | { | |
378 | .ctl_name = KERN_PRINTK, | |
379 | .procname = "printk", | |
380 | .data = &console_loglevel, | |
381 | .maxlen = 4*sizeof(int), | |
382 | .mode = 0644, | |
383 | .proc_handler = &proc_dointvec, | |
384 | }, | |
385 | #ifdef CONFIG_KMOD | |
386 | { | |
387 | .ctl_name = KERN_MODPROBE, | |
388 | .procname = "modprobe", | |
389 | .data = &modprobe_path, | |
390 | .maxlen = KMOD_PATH_LEN, | |
391 | .mode = 0644, | |
392 | .proc_handler = &proc_dostring, | |
393 | .strategy = &sysctl_string, | |
394 | }, | |
395 | #endif | |
396 | #ifdef CONFIG_HOTPLUG | |
397 | { | |
398 | .ctl_name = KERN_HOTPLUG, | |
399 | .procname = "hotplug", | |
312c004d KS |
400 | .data = &uevent_helper, |
401 | .maxlen = UEVENT_HELPER_PATH_LEN, | |
1da177e4 LT |
402 | .mode = 0644, |
403 | .proc_handler = &proc_dostring, | |
404 | .strategy = &sysctl_string, | |
405 | }, | |
406 | #endif | |
407 | #ifdef CONFIG_CHR_DEV_SG | |
408 | { | |
409 | .ctl_name = KERN_SG_BIG_BUFF, | |
410 | .procname = "sg-big-buff", | |
411 | .data = &sg_big_buff, | |
412 | .maxlen = sizeof (int), | |
413 | .mode = 0444, | |
414 | .proc_handler = &proc_dointvec, | |
415 | }, | |
416 | #endif | |
417 | #ifdef CONFIG_BSD_PROCESS_ACCT | |
418 | { | |
419 | .ctl_name = KERN_ACCT, | |
420 | .procname = "acct", | |
421 | .data = &acct_parm, | |
422 | .maxlen = 3*sizeof(int), | |
423 | .mode = 0644, | |
424 | .proc_handler = &proc_dointvec, | |
425 | }, | |
426 | #endif | |
427 | #ifdef CONFIG_SYSVIPC | |
428 | { | |
429 | .ctl_name = KERN_SHMMAX, | |
430 | .procname = "shmmax", | |
431 | .data = &shm_ctlmax, | |
432 | .maxlen = sizeof (size_t), | |
433 | .mode = 0644, | |
434 | .proc_handler = &proc_doulongvec_minmax, | |
435 | }, | |
436 | { | |
437 | .ctl_name = KERN_SHMALL, | |
438 | .procname = "shmall", | |
439 | .data = &shm_ctlall, | |
440 | .maxlen = sizeof (size_t), | |
441 | .mode = 0644, | |
442 | .proc_handler = &proc_doulongvec_minmax, | |
443 | }, | |
444 | { | |
445 | .ctl_name = KERN_SHMMNI, | |
446 | .procname = "shmmni", | |
447 | .data = &shm_ctlmni, | |
448 | .maxlen = sizeof (int), | |
449 | .mode = 0644, | |
450 | .proc_handler = &proc_dointvec, | |
451 | }, | |
452 | { | |
453 | .ctl_name = KERN_MSGMAX, | |
454 | .procname = "msgmax", | |
455 | .data = &msg_ctlmax, | |
456 | .maxlen = sizeof (int), | |
457 | .mode = 0644, | |
458 | .proc_handler = &proc_dointvec, | |
459 | }, | |
460 | { | |
461 | .ctl_name = KERN_MSGMNI, | |
462 | .procname = "msgmni", | |
463 | .data = &msg_ctlmni, | |
464 | .maxlen = sizeof (int), | |
465 | .mode = 0644, | |
466 | .proc_handler = &proc_dointvec, | |
467 | }, | |
468 | { | |
469 | .ctl_name = KERN_MSGMNB, | |
470 | .procname = "msgmnb", | |
471 | .data = &msg_ctlmnb, | |
472 | .maxlen = sizeof (int), | |
473 | .mode = 0644, | |
474 | .proc_handler = &proc_dointvec, | |
475 | }, | |
476 | { | |
477 | .ctl_name = KERN_SEM, | |
478 | .procname = "sem", | |
479 | .data = &sem_ctls, | |
480 | .maxlen = 4*sizeof (int), | |
481 | .mode = 0644, | |
482 | .proc_handler = &proc_dointvec, | |
483 | }, | |
484 | #endif | |
485 | #ifdef CONFIG_MAGIC_SYSRQ | |
486 | { | |
487 | .ctl_name = KERN_SYSRQ, | |
488 | .procname = "sysrq", | |
489 | .data = &sysrq_enabled, | |
490 | .maxlen = sizeof (int), | |
491 | .mode = 0644, | |
492 | .proc_handler = &proc_dointvec, | |
493 | }, | |
494 | #endif | |
495 | { | |
496 | .ctl_name = KERN_CADPID, | |
497 | .procname = "cad_pid", | |
498 | .data = &cad_pid, | |
499 | .maxlen = sizeof (int), | |
500 | .mode = 0600, | |
501 | .proc_handler = &proc_dointvec, | |
502 | }, | |
503 | { | |
504 | .ctl_name = KERN_MAX_THREADS, | |
505 | .procname = "threads-max", | |
506 | .data = &max_threads, | |
507 | .maxlen = sizeof(int), | |
508 | .mode = 0644, | |
509 | .proc_handler = &proc_dointvec, | |
510 | }, | |
511 | { | |
512 | .ctl_name = KERN_RANDOM, | |
513 | .procname = "random", | |
514 | .mode = 0555, | |
515 | .child = random_table, | |
516 | }, | |
517 | #ifdef CONFIG_UNIX98_PTYS | |
518 | { | |
519 | .ctl_name = KERN_PTY, | |
520 | .procname = "pty", | |
521 | .mode = 0555, | |
522 | .child = pty_table, | |
523 | }, | |
524 | #endif | |
525 | { | |
526 | .ctl_name = KERN_OVERFLOWUID, | |
527 | .procname = "overflowuid", | |
528 | .data = &overflowuid, | |
529 | .maxlen = sizeof(int), | |
530 | .mode = 0644, | |
531 | .proc_handler = &proc_dointvec_minmax, | |
532 | .strategy = &sysctl_intvec, | |
533 | .extra1 = &minolduid, | |
534 | .extra2 = &maxolduid, | |
535 | }, | |
536 | { | |
537 | .ctl_name = KERN_OVERFLOWGID, | |
538 | .procname = "overflowgid", | |
539 | .data = &overflowgid, | |
540 | .maxlen = sizeof(int), | |
541 | .mode = 0644, | |
542 | .proc_handler = &proc_dointvec_minmax, | |
543 | .strategy = &sysctl_intvec, | |
544 | .extra1 = &minolduid, | |
545 | .extra2 = &maxolduid, | |
546 | }, | |
347a8dc3 | 547 | #ifdef CONFIG_S390 |
1da177e4 LT |
548 | #ifdef CONFIG_MATHEMU |
549 | { | |
550 | .ctl_name = KERN_IEEE_EMULATION_WARNINGS, | |
551 | .procname = "ieee_emulation_warnings", | |
552 | .data = &sysctl_ieee_emulation_warnings, | |
553 | .maxlen = sizeof(int), | |
554 | .mode = 0644, | |
555 | .proc_handler = &proc_dointvec, | |
556 | }, | |
557 | #endif | |
558 | #ifdef CONFIG_NO_IDLE_HZ | |
559 | { | |
560 | .ctl_name = KERN_HZ_TIMER, | |
561 | .procname = "hz_timer", | |
562 | .data = &sysctl_hz_timer, | |
563 | .maxlen = sizeof(int), | |
564 | .mode = 0644, | |
565 | .proc_handler = &proc_dointvec, | |
566 | }, | |
567 | #endif | |
568 | { | |
569 | .ctl_name = KERN_S390_USER_DEBUG_LOGGING, | |
570 | .procname = "userprocess_debug", | |
571 | .data = &sysctl_userprocess_debug, | |
572 | .maxlen = sizeof(int), | |
573 | .mode = 0644, | |
574 | .proc_handler = &proc_dointvec, | |
575 | }, | |
576 | #endif | |
577 | { | |
578 | .ctl_name = KERN_PIDMAX, | |
579 | .procname = "pid_max", | |
580 | .data = &pid_max, | |
581 | .maxlen = sizeof (int), | |
582 | .mode = 0644, | |
583 | .proc_handler = &proc_dointvec_minmax, | |
584 | .strategy = sysctl_intvec, | |
585 | .extra1 = &pid_max_min, | |
586 | .extra2 = &pid_max_max, | |
587 | }, | |
588 | { | |
589 | .ctl_name = KERN_PANIC_ON_OOPS, | |
590 | .procname = "panic_on_oops", | |
591 | .data = &panic_on_oops, | |
592 | .maxlen = sizeof(int), | |
593 | .mode = 0644, | |
594 | .proc_handler = &proc_dointvec, | |
595 | }, | |
596 | { | |
597 | .ctl_name = KERN_PRINTK_RATELIMIT, | |
598 | .procname = "printk_ratelimit", | |
599 | .data = &printk_ratelimit_jiffies, | |
600 | .maxlen = sizeof(int), | |
601 | .mode = 0644, | |
602 | .proc_handler = &proc_dointvec_jiffies, | |
603 | .strategy = &sysctl_jiffies, | |
604 | }, | |
605 | { | |
606 | .ctl_name = KERN_PRINTK_RATELIMIT_BURST, | |
607 | .procname = "printk_ratelimit_burst", | |
608 | .data = &printk_ratelimit_burst, | |
609 | .maxlen = sizeof(int), | |
610 | .mode = 0644, | |
611 | .proc_handler = &proc_dointvec, | |
612 | }, | |
613 | { | |
614 | .ctl_name = KERN_NGROUPS_MAX, | |
615 | .procname = "ngroups_max", | |
616 | .data = &ngroups_max, | |
617 | .maxlen = sizeof (int), | |
618 | .mode = 0444, | |
619 | .proc_handler = &proc_dointvec, | |
620 | }, | |
621 | #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86) | |
622 | { | |
623 | .ctl_name = KERN_UNKNOWN_NMI_PANIC, | |
624 | .procname = "unknown_nmi_panic", | |
625 | .data = &unknown_nmi_panic, | |
626 | .maxlen = sizeof (int), | |
627 | .mode = 0644, | |
628 | .proc_handler = &proc_unknown_nmi_panic, | |
629 | }, | |
630 | #endif | |
631 | #if defined(CONFIG_X86) | |
632 | { | |
633 | .ctl_name = KERN_BOOTLOADER_TYPE, | |
634 | .procname = "bootloader_type", | |
635 | .data = &bootloader_type, | |
636 | .maxlen = sizeof (int), | |
637 | .mode = 0444, | |
638 | .proc_handler = &proc_dointvec, | |
639 | }, | |
640 | #endif | |
641 | { | |
642 | .ctl_name = KERN_RANDOMIZE, | |
643 | .procname = "randomize_va_space", | |
644 | .data = &randomize_va_space, | |
645 | .maxlen = sizeof(int), | |
646 | .mode = 0644, | |
647 | .proc_handler = &proc_dointvec, | |
648 | }, | |
0152fb37 | 649 | #if defined(CONFIG_S390) && defined(CONFIG_SMP) |
951f22d5 MS |
650 | { |
651 | .ctl_name = KERN_SPIN_RETRY, | |
652 | .procname = "spin_retry", | |
653 | .data = &spin_retry, | |
654 | .maxlen = sizeof (int), | |
655 | .mode = 0644, | |
656 | .proc_handler = &proc_dointvec, | |
657 | }, | |
658 | #endif | |
1da177e4 LT |
659 | { .ctl_name = 0 } |
660 | }; | |
661 | ||
662 | /* Constants for minimum and maximum testing in vm_table. | |
663 | We use these as one-element integer vectors. */ | |
664 | static int zero; | |
665 | static int one_hundred = 100; | |
666 | ||
667 | ||
668 | static ctl_table vm_table[] = { | |
669 | { | |
670 | .ctl_name = VM_OVERCOMMIT_MEMORY, | |
671 | .procname = "overcommit_memory", | |
672 | .data = &sysctl_overcommit_memory, | |
673 | .maxlen = sizeof(sysctl_overcommit_memory), | |
674 | .mode = 0644, | |
675 | .proc_handler = &proc_dointvec, | |
676 | }, | |
677 | { | |
678 | .ctl_name = VM_OVERCOMMIT_RATIO, | |
679 | .procname = "overcommit_ratio", | |
680 | .data = &sysctl_overcommit_ratio, | |
681 | .maxlen = sizeof(sysctl_overcommit_ratio), | |
682 | .mode = 0644, | |
683 | .proc_handler = &proc_dointvec, | |
684 | }, | |
685 | { | |
686 | .ctl_name = VM_PAGE_CLUSTER, | |
687 | .procname = "page-cluster", | |
688 | .data = &page_cluster, | |
689 | .maxlen = sizeof(int), | |
690 | .mode = 0644, | |
691 | .proc_handler = &proc_dointvec, | |
692 | }, | |
693 | { | |
694 | .ctl_name = VM_DIRTY_BACKGROUND, | |
695 | .procname = "dirty_background_ratio", | |
696 | .data = &dirty_background_ratio, | |
697 | .maxlen = sizeof(dirty_background_ratio), | |
698 | .mode = 0644, | |
699 | .proc_handler = &proc_dointvec_minmax, | |
700 | .strategy = &sysctl_intvec, | |
701 | .extra1 = &zero, | |
702 | .extra2 = &one_hundred, | |
703 | }, | |
704 | { | |
705 | .ctl_name = VM_DIRTY_RATIO, | |
706 | .procname = "dirty_ratio", | |
707 | .data = &vm_dirty_ratio, | |
708 | .maxlen = sizeof(vm_dirty_ratio), | |
709 | .mode = 0644, | |
710 | .proc_handler = &proc_dointvec_minmax, | |
711 | .strategy = &sysctl_intvec, | |
712 | .extra1 = &zero, | |
713 | .extra2 = &one_hundred, | |
714 | }, | |
715 | { | |
716 | .ctl_name = VM_DIRTY_WB_CS, | |
717 | .procname = "dirty_writeback_centisecs", | |
718 | .data = &dirty_writeback_centisecs, | |
719 | .maxlen = sizeof(dirty_writeback_centisecs), | |
720 | .mode = 0644, | |
721 | .proc_handler = &dirty_writeback_centisecs_handler, | |
722 | }, | |
723 | { | |
724 | .ctl_name = VM_DIRTY_EXPIRE_CS, | |
725 | .procname = "dirty_expire_centisecs", | |
726 | .data = &dirty_expire_centisecs, | |
727 | .maxlen = sizeof(dirty_expire_centisecs), | |
728 | .mode = 0644, | |
729 | .proc_handler = &proc_dointvec, | |
730 | }, | |
731 | { | |
732 | .ctl_name = VM_NR_PDFLUSH_THREADS, | |
733 | .procname = "nr_pdflush_threads", | |
734 | .data = &nr_pdflush_threads, | |
735 | .maxlen = sizeof nr_pdflush_threads, | |
736 | .mode = 0444 /* read-only*/, | |
737 | .proc_handler = &proc_dointvec, | |
738 | }, | |
739 | { | |
740 | .ctl_name = VM_SWAPPINESS, | |
741 | .procname = "swappiness", | |
742 | .data = &vm_swappiness, | |
743 | .maxlen = sizeof(vm_swappiness), | |
744 | .mode = 0644, | |
745 | .proc_handler = &proc_dointvec_minmax, | |
746 | .strategy = &sysctl_intvec, | |
747 | .extra1 = &zero, | |
748 | .extra2 = &one_hundred, | |
749 | }, | |
750 | #ifdef CONFIG_HUGETLB_PAGE | |
751 | { | |
752 | .ctl_name = VM_HUGETLB_PAGES, | |
753 | .procname = "nr_hugepages", | |
754 | .data = &max_huge_pages, | |
755 | .maxlen = sizeof(unsigned long), | |
756 | .mode = 0644, | |
757 | .proc_handler = &hugetlb_sysctl_handler, | |
758 | .extra1 = (void *)&hugetlb_zero, | |
759 | .extra2 = (void *)&hugetlb_infinity, | |
760 | }, | |
761 | { | |
762 | .ctl_name = VM_HUGETLB_GROUP, | |
763 | .procname = "hugetlb_shm_group", | |
764 | .data = &sysctl_hugetlb_shm_group, | |
765 | .maxlen = sizeof(gid_t), | |
766 | .mode = 0644, | |
767 | .proc_handler = &proc_dointvec, | |
768 | }, | |
769 | #endif | |
770 | { | |
771 | .ctl_name = VM_LOWMEM_RESERVE_RATIO, | |
772 | .procname = "lowmem_reserve_ratio", | |
773 | .data = &sysctl_lowmem_reserve_ratio, | |
774 | .maxlen = sizeof(sysctl_lowmem_reserve_ratio), | |
775 | .mode = 0644, | |
776 | .proc_handler = &lowmem_reserve_ratio_sysctl_handler, | |
777 | .strategy = &sysctl_intvec, | |
778 | }, | |
9d0243bc AM |
779 | { |
780 | .ctl_name = VM_DROP_PAGECACHE, | |
781 | .procname = "drop_caches", | |
782 | .data = &sysctl_drop_caches, | |
783 | .maxlen = sizeof(int), | |
784 | .mode = 0644, | |
785 | .proc_handler = drop_caches_sysctl_handler, | |
786 | .strategy = &sysctl_intvec, | |
787 | }, | |
1da177e4 LT |
788 | { |
789 | .ctl_name = VM_MIN_FREE_KBYTES, | |
790 | .procname = "min_free_kbytes", | |
791 | .data = &min_free_kbytes, | |
792 | .maxlen = sizeof(min_free_kbytes), | |
793 | .mode = 0644, | |
794 | .proc_handler = &min_free_kbytes_sysctl_handler, | |
795 | .strategy = &sysctl_intvec, | |
796 | .extra1 = &zero, | |
797 | }, | |
8ad4b1fb RS |
798 | { |
799 | .ctl_name = VM_PERCPU_PAGELIST_FRACTION, | |
800 | .procname = "percpu_pagelist_fraction", | |
801 | .data = &percpu_pagelist_fraction, | |
802 | .maxlen = sizeof(percpu_pagelist_fraction), | |
803 | .mode = 0644, | |
804 | .proc_handler = &percpu_pagelist_fraction_sysctl_handler, | |
805 | .strategy = &sysctl_intvec, | |
806 | .extra1 = &min_percpu_pagelist_fract, | |
807 | }, | |
1da177e4 LT |
808 | #ifdef CONFIG_MMU |
809 | { | |
810 | .ctl_name = VM_MAX_MAP_COUNT, | |
811 | .procname = "max_map_count", | |
812 | .data = &sysctl_max_map_count, | |
813 | .maxlen = sizeof(sysctl_max_map_count), | |
814 | .mode = 0644, | |
815 | .proc_handler = &proc_dointvec | |
816 | }, | |
817 | #endif | |
818 | { | |
819 | .ctl_name = VM_LAPTOP_MODE, | |
820 | .procname = "laptop_mode", | |
821 | .data = &laptop_mode, | |
822 | .maxlen = sizeof(laptop_mode), | |
823 | .mode = 0644, | |
824 | .proc_handler = &proc_dointvec, | |
825 | .strategy = &sysctl_intvec, | |
826 | .extra1 = &zero, | |
827 | }, | |
828 | { | |
829 | .ctl_name = VM_BLOCK_DUMP, | |
830 | .procname = "block_dump", | |
831 | .data = &block_dump, | |
832 | .maxlen = sizeof(block_dump), | |
833 | .mode = 0644, | |
834 | .proc_handler = &proc_dointvec, | |
835 | .strategy = &sysctl_intvec, | |
836 | .extra1 = &zero, | |
837 | }, | |
838 | { | |
839 | .ctl_name = VM_VFS_CACHE_PRESSURE, | |
840 | .procname = "vfs_cache_pressure", | |
841 | .data = &sysctl_vfs_cache_pressure, | |
842 | .maxlen = sizeof(sysctl_vfs_cache_pressure), | |
843 | .mode = 0644, | |
844 | .proc_handler = &proc_dointvec, | |
845 | .strategy = &sysctl_intvec, | |
846 | .extra1 = &zero, | |
847 | }, | |
848 | #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT | |
849 | { | |
850 | .ctl_name = VM_LEGACY_VA_LAYOUT, | |
851 | .procname = "legacy_va_layout", | |
852 | .data = &sysctl_legacy_va_layout, | |
853 | .maxlen = sizeof(sysctl_legacy_va_layout), | |
854 | .mode = 0644, | |
855 | .proc_handler = &proc_dointvec, | |
856 | .strategy = &sysctl_intvec, | |
857 | .extra1 = &zero, | |
858 | }, | |
859 | #endif | |
860 | #ifdef CONFIG_SWAP | |
861 | { | |
862 | .ctl_name = VM_SWAP_TOKEN_TIMEOUT, | |
863 | .procname = "swap_token_timeout", | |
864 | .data = &swap_token_default_timeout, | |
865 | .maxlen = sizeof(swap_token_default_timeout), | |
866 | .mode = 0644, | |
867 | .proc_handler = &proc_dointvec_jiffies, | |
868 | .strategy = &sysctl_jiffies, | |
869 | }, | |
1743660b CL |
870 | #endif |
871 | #ifdef CONFIG_NUMA | |
872 | { | |
873 | .ctl_name = VM_ZONE_RECLAIM_MODE, | |
874 | .procname = "zone_reclaim_mode", | |
875 | .data = &zone_reclaim_mode, | |
876 | .maxlen = sizeof(zone_reclaim_mode), | |
877 | .mode = 0644, | |
878 | .proc_handler = &proc_dointvec, | |
c84db23c CL |
879 | .strategy = &sysctl_intvec, |
880 | .extra1 = &zero, | |
1743660b | 881 | }, |
2a11ff06 CL |
882 | { |
883 | .ctl_name = VM_ZONE_RECLAIM_INTERVAL, | |
884 | .procname = "zone_reclaim_interval", | |
885 | .data = &zone_reclaim_interval, | |
886 | .maxlen = sizeof(zone_reclaim_interval), | |
887 | .mode = 0644, | |
888 | .proc_handler = &proc_dointvec_jiffies, | |
889 | .strategy = &sysctl_jiffies, | |
890 | }, | |
1da177e4 LT |
891 | #endif |
892 | { .ctl_name = 0 } | |
893 | }; | |
894 | ||
895 | static ctl_table proc_table[] = { | |
896 | { .ctl_name = 0 } | |
897 | }; | |
898 | ||
899 | static ctl_table fs_table[] = { | |
900 | { | |
901 | .ctl_name = FS_NRINODE, | |
902 | .procname = "inode-nr", | |
903 | .data = &inodes_stat, | |
904 | .maxlen = 2*sizeof(int), | |
905 | .mode = 0444, | |
906 | .proc_handler = &proc_dointvec, | |
907 | }, | |
908 | { | |
909 | .ctl_name = FS_STATINODE, | |
910 | .procname = "inode-state", | |
911 | .data = &inodes_stat, | |
912 | .maxlen = 7*sizeof(int), | |
913 | .mode = 0444, | |
914 | .proc_handler = &proc_dointvec, | |
915 | }, | |
916 | { | |
917 | .ctl_name = FS_NRFILE, | |
918 | .procname = "file-nr", | |
919 | .data = &files_stat, | |
920 | .maxlen = 3*sizeof(int), | |
921 | .mode = 0444, | |
922 | .proc_handler = &proc_dointvec, | |
923 | }, | |
924 | { | |
925 | .ctl_name = FS_MAXFILE, | |
926 | .procname = "file-max", | |
927 | .data = &files_stat.max_files, | |
928 | .maxlen = sizeof(int), | |
929 | .mode = 0644, | |
930 | .proc_handler = &proc_dointvec, | |
931 | }, | |
932 | { | |
933 | .ctl_name = FS_DENTRY, | |
934 | .procname = "dentry-state", | |
935 | .data = &dentry_stat, | |
936 | .maxlen = 6*sizeof(int), | |
937 | .mode = 0444, | |
938 | .proc_handler = &proc_dointvec, | |
939 | }, | |
940 | { | |
941 | .ctl_name = FS_OVERFLOWUID, | |
942 | .procname = "overflowuid", | |
943 | .data = &fs_overflowuid, | |
944 | .maxlen = sizeof(int), | |
945 | .mode = 0644, | |
946 | .proc_handler = &proc_dointvec_minmax, | |
947 | .strategy = &sysctl_intvec, | |
948 | .extra1 = &minolduid, | |
949 | .extra2 = &maxolduid, | |
950 | }, | |
951 | { | |
952 | .ctl_name = FS_OVERFLOWGID, | |
953 | .procname = "overflowgid", | |
954 | .data = &fs_overflowgid, | |
955 | .maxlen = sizeof(int), | |
956 | .mode = 0644, | |
957 | .proc_handler = &proc_dointvec_minmax, | |
958 | .strategy = &sysctl_intvec, | |
959 | .extra1 = &minolduid, | |
960 | .extra2 = &maxolduid, | |
961 | }, | |
962 | { | |
963 | .ctl_name = FS_LEASES, | |
964 | .procname = "leases-enable", | |
965 | .data = &leases_enable, | |
966 | .maxlen = sizeof(int), | |
967 | .mode = 0644, | |
968 | .proc_handler = &proc_dointvec, | |
969 | }, | |
970 | #ifdef CONFIG_DNOTIFY | |
971 | { | |
972 | .ctl_name = FS_DIR_NOTIFY, | |
973 | .procname = "dir-notify-enable", | |
974 | .data = &dir_notify_enable, | |
975 | .maxlen = sizeof(int), | |
976 | .mode = 0644, | |
977 | .proc_handler = &proc_dointvec, | |
978 | }, | |
979 | #endif | |
980 | #ifdef CONFIG_MMU | |
981 | { | |
982 | .ctl_name = FS_LEASE_TIME, | |
983 | .procname = "lease-break-time", | |
984 | .data = &lease_break_time, | |
985 | .maxlen = sizeof(int), | |
986 | .mode = 0644, | |
987 | .proc_handler = &proc_dointvec, | |
988 | }, | |
989 | { | |
990 | .ctl_name = FS_AIO_NR, | |
991 | .procname = "aio-nr", | |
992 | .data = &aio_nr, | |
993 | .maxlen = sizeof(aio_nr), | |
994 | .mode = 0444, | |
d55b5fda | 995 | .proc_handler = &proc_doulongvec_minmax, |
1da177e4 LT |
996 | }, |
997 | { | |
998 | .ctl_name = FS_AIO_MAX_NR, | |
999 | .procname = "aio-max-nr", | |
1000 | .data = &aio_max_nr, | |
1001 | .maxlen = sizeof(aio_max_nr), | |
1002 | .mode = 0644, | |
d55b5fda | 1003 | .proc_handler = &proc_doulongvec_minmax, |
1da177e4 | 1004 | }, |
0399cb08 RL |
1005 | #ifdef CONFIG_INOTIFY |
1006 | { | |
1007 | .ctl_name = FS_INOTIFY, | |
1008 | .procname = "inotify", | |
1009 | .mode = 0555, | |
1010 | .child = inotify_table, | |
1011 | }, | |
1012 | #endif | |
1da177e4 | 1013 | #endif |
d6e71144 AC |
1014 | { |
1015 | .ctl_name = KERN_SETUID_DUMPABLE, | |
1016 | .procname = "suid_dumpable", | |
1017 | .data = &suid_dumpable, | |
1018 | .maxlen = sizeof(int), | |
1019 | .mode = 0644, | |
1020 | .proc_handler = &proc_dointvec, | |
1021 | }, | |
1da177e4 LT |
1022 | { .ctl_name = 0 } |
1023 | }; | |
1024 | ||
1025 | static ctl_table debug_table[] = { | |
1026 | { .ctl_name = 0 } | |
1027 | }; | |
1028 | ||
1029 | static ctl_table dev_table[] = { | |
1030 | { .ctl_name = 0 } | |
0eeca283 | 1031 | }; |
1da177e4 LT |
1032 | |
1033 | extern void init_irq_proc (void); | |
1034 | ||
330d57fb AV |
1035 | static DEFINE_SPINLOCK(sysctl_lock); |
1036 | ||
1037 | /* called under sysctl_lock */ | |
1038 | static int use_table(struct ctl_table_header *p) | |
1039 | { | |
1040 | if (unlikely(p->unregistering)) | |
1041 | return 0; | |
1042 | p->used++; | |
1043 | return 1; | |
1044 | } | |
1045 | ||
1046 | /* called under sysctl_lock */ | |
1047 | static void unuse_table(struct ctl_table_header *p) | |
1048 | { | |
1049 | if (!--p->used) | |
1050 | if (unlikely(p->unregistering)) | |
1051 | complete(p->unregistering); | |
1052 | } | |
1053 | ||
1054 | /* called under sysctl_lock, will reacquire if has to wait */ | |
1055 | static void start_unregistering(struct ctl_table_header *p) | |
1056 | { | |
1057 | /* | |
1058 | * if p->used is 0, nobody will ever touch that entry again; | |
1059 | * we'll eliminate all paths to it before dropping sysctl_lock | |
1060 | */ | |
1061 | if (unlikely(p->used)) { | |
1062 | struct completion wait; | |
1063 | init_completion(&wait); | |
1064 | p->unregistering = &wait; | |
1065 | spin_unlock(&sysctl_lock); | |
1066 | wait_for_completion(&wait); | |
1067 | spin_lock(&sysctl_lock); | |
1068 | } | |
1069 | /* | |
1070 | * do not remove from the list until nobody holds it; walking the | |
1071 | * list in do_sysctl() relies on that. | |
1072 | */ | |
1073 | list_del_init(&p->ctl_entry); | |
1074 | } | |
1075 | ||
1da177e4 LT |
1076 | void __init sysctl_init(void) |
1077 | { | |
1078 | #ifdef CONFIG_PROC_FS | |
330d57fb | 1079 | register_proc_table(root_table, proc_sys_root, &root_table_header); |
1da177e4 LT |
1080 | init_irq_proc(); |
1081 | #endif | |
1082 | } | |
1083 | ||
1084 | int do_sysctl(int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp, | |
1085 | void __user *newval, size_t newlen) | |
1086 | { | |
1087 | struct list_head *tmp; | |
330d57fb | 1088 | int error = -ENOTDIR; |
1da177e4 LT |
1089 | |
1090 | if (nlen <= 0 || nlen >= CTL_MAXNAME) | |
1091 | return -ENOTDIR; | |
1092 | if (oldval) { | |
1093 | int old_len; | |
1094 | if (!oldlenp || get_user(old_len, oldlenp)) | |
1095 | return -EFAULT; | |
1096 | } | |
330d57fb | 1097 | spin_lock(&sysctl_lock); |
1da177e4 LT |
1098 | tmp = &root_table_header.ctl_entry; |
1099 | do { | |
1100 | struct ctl_table_header *head = | |
1101 | list_entry(tmp, struct ctl_table_header, ctl_entry); | |
1102 | void *context = NULL; | |
330d57fb AV |
1103 | |
1104 | if (!use_table(head)) | |
1105 | continue; | |
1106 | ||
1107 | spin_unlock(&sysctl_lock); | |
1108 | ||
1109 | error = parse_table(name, nlen, oldval, oldlenp, | |
1da177e4 LT |
1110 | newval, newlen, head->ctl_table, |
1111 | &context); | |
5a6b454f | 1112 | kfree(context); |
330d57fb AV |
1113 | |
1114 | spin_lock(&sysctl_lock); | |
1115 | unuse_table(head); | |
1da177e4 | 1116 | if (error != -ENOTDIR) |
330d57fb AV |
1117 | break; |
1118 | } while ((tmp = tmp->next) != &root_table_header.ctl_entry); | |
1119 | spin_unlock(&sysctl_lock); | |
1120 | return error; | |
1da177e4 LT |
1121 | } |
1122 | ||
1123 | asmlinkage long sys_sysctl(struct __sysctl_args __user *args) | |
1124 | { | |
1125 | struct __sysctl_args tmp; | |
1126 | int error; | |
1127 | ||
1128 | if (copy_from_user(&tmp, args, sizeof(tmp))) | |
1129 | return -EFAULT; | |
1130 | ||
1131 | lock_kernel(); | |
1132 | error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp, | |
1133 | tmp.newval, tmp.newlen); | |
1134 | unlock_kernel(); | |
1135 | return error; | |
1136 | } | |
1137 | ||
1138 | /* | |
1139 | * ctl_perm does NOT grant the superuser all rights automatically, because | |
1140 | * some sysctl variables are readonly even to root. | |
1141 | */ | |
1142 | ||
1143 | static int test_perm(int mode, int op) | |
1144 | { | |
1145 | if (!current->euid) | |
1146 | mode >>= 6; | |
1147 | else if (in_egroup_p(0)) | |
1148 | mode >>= 3; | |
1149 | if ((mode & op & 0007) == op) | |
1150 | return 0; | |
1151 | return -EACCES; | |
1152 | } | |
1153 | ||
1154 | static inline int ctl_perm(ctl_table *table, int op) | |
1155 | { | |
1156 | int error; | |
1157 | error = security_sysctl(table, op); | |
1158 | if (error) | |
1159 | return error; | |
1160 | return test_perm(table->mode, op); | |
1161 | } | |
1162 | ||
1163 | static int parse_table(int __user *name, int nlen, | |
1164 | void __user *oldval, size_t __user *oldlenp, | |
1165 | void __user *newval, size_t newlen, | |
1166 | ctl_table *table, void **context) | |
1167 | { | |
1168 | int n; | |
1169 | repeat: | |
1170 | if (!nlen) | |
1171 | return -ENOTDIR; | |
1172 | if (get_user(n, name)) | |
1173 | return -EFAULT; | |
1174 | for ( ; table->ctl_name; table++) { | |
1175 | if (n == table->ctl_name || table->ctl_name == CTL_ANY) { | |
1176 | int error; | |
1177 | if (table->child) { | |
1178 | if (ctl_perm(table, 001)) | |
1179 | return -EPERM; | |
1180 | if (table->strategy) { | |
1181 | error = table->strategy( | |
1182 | table, name, nlen, | |
1183 | oldval, oldlenp, | |
1184 | newval, newlen, context); | |
1185 | if (error) | |
1186 | return error; | |
1187 | } | |
1188 | name++; | |
1189 | nlen--; | |
1190 | table = table->child; | |
1191 | goto repeat; | |
1192 | } | |
1193 | error = do_sysctl_strategy(table, name, nlen, | |
1194 | oldval, oldlenp, | |
1195 | newval, newlen, context); | |
1196 | return error; | |
1197 | } | |
1198 | } | |
1199 | return -ENOTDIR; | |
1200 | } | |
1201 | ||
1202 | /* Perform the actual read/write of a sysctl table entry. */ | |
1203 | int do_sysctl_strategy (ctl_table *table, | |
1204 | int __user *name, int nlen, | |
1205 | void __user *oldval, size_t __user *oldlenp, | |
1206 | void __user *newval, size_t newlen, void **context) | |
1207 | { | |
1208 | int op = 0, rc; | |
1209 | size_t len; | |
1210 | ||
1211 | if (oldval) | |
1212 | op |= 004; | |
1213 | if (newval) | |
1214 | op |= 002; | |
1215 | if (ctl_perm(table, op)) | |
1216 | return -EPERM; | |
1217 | ||
1218 | if (table->strategy) { | |
1219 | rc = table->strategy(table, name, nlen, oldval, oldlenp, | |
1220 | newval, newlen, context); | |
1221 | if (rc < 0) | |
1222 | return rc; | |
1223 | if (rc > 0) | |
1224 | return 0; | |
1225 | } | |
1226 | ||
1227 | /* If there is no strategy routine, or if the strategy returns | |
1228 | * zero, proceed with automatic r/w */ | |
1229 | if (table->data && table->maxlen) { | |
1230 | if (oldval && oldlenp) { | |
1231 | if (get_user(len, oldlenp)) | |
1232 | return -EFAULT; | |
1233 | if (len) { | |
1234 | if (len > table->maxlen) | |
1235 | len = table->maxlen; | |
1236 | if(copy_to_user(oldval, table->data, len)) | |
1237 | return -EFAULT; | |
1238 | if(put_user(len, oldlenp)) | |
1239 | return -EFAULT; | |
1240 | } | |
1241 | } | |
1242 | if (newval && newlen) { | |
1243 | len = newlen; | |
1244 | if (len > table->maxlen) | |
1245 | len = table->maxlen; | |
1246 | if(copy_from_user(table->data, newval, len)) | |
1247 | return -EFAULT; | |
1248 | } | |
1249 | } | |
1250 | return 0; | |
1251 | } | |
1252 | ||
1253 | /** | |
1254 | * register_sysctl_table - register a sysctl hierarchy | |
1255 | * @table: the top-level table structure | |
1256 | * @insert_at_head: whether the entry should be inserted in front or at the end | |
1257 | * | |
1258 | * Register a sysctl table hierarchy. @table should be a filled in ctl_table | |
1259 | * array. An entry with a ctl_name of 0 terminates the table. | |
1260 | * | |
1261 | * The members of the &ctl_table structure are used as follows: | |
1262 | * | |
1263 | * ctl_name - This is the numeric sysctl value used by sysctl(2). The number | |
1264 | * must be unique within that level of sysctl | |
1265 | * | |
1266 | * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not | |
1267 | * enter a sysctl file | |
1268 | * | |
1269 | * data - a pointer to data for use by proc_handler | |
1270 | * | |
1271 | * maxlen - the maximum size in bytes of the data | |
1272 | * | |
1273 | * mode - the file permissions for the /proc/sys file, and for sysctl(2) | |
1274 | * | |
1275 | * child - a pointer to the child sysctl table if this entry is a directory, or | |
1276 | * %NULL. | |
1277 | * | |
1278 | * proc_handler - the text handler routine (described below) | |
1279 | * | |
1280 | * strategy - the strategy routine (described below) | |
1281 | * | |
1282 | * de - for internal use by the sysctl routines | |
1283 | * | |
1284 | * extra1, extra2 - extra pointers usable by the proc handler routines | |
1285 | * | |
1286 | * Leaf nodes in the sysctl tree will be represented by a single file | |
1287 | * under /proc; non-leaf nodes will be represented by directories. | |
1288 | * | |
1289 | * sysctl(2) can automatically manage read and write requests through | |
1290 | * the sysctl table. The data and maxlen fields of the ctl_table | |
1291 | * struct enable minimal validation of the values being written to be | |
1292 | * performed, and the mode field allows minimal authentication. | |
1293 | * | |
1294 | * More sophisticated management can be enabled by the provision of a | |
1295 | * strategy routine with the table entry. This will be called before | |
1296 | * any automatic read or write of the data is performed. | |
1297 | * | |
1298 | * The strategy routine may return | |
1299 | * | |
1300 | * < 0 - Error occurred (error is passed to user process) | |
1301 | * | |
1302 | * 0 - OK - proceed with automatic read or write. | |
1303 | * | |
1304 | * > 0 - OK - read or write has been done by the strategy routine, so | |
1305 | * return immediately. | |
1306 | * | |
1307 | * There must be a proc_handler routine for any terminal nodes | |
1308 | * mirrored under /proc/sys (non-terminals are handled by a built-in | |
1309 | * directory handler). Several default handlers are available to | |
1310 | * cover common cases - | |
1311 | * | |
1312 | * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(), | |
1313 | * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(), | |
1314 | * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax() | |
1315 | * | |
1316 | * It is the handler's job to read the input buffer from user memory | |
1317 | * and process it. The handler should return 0 on success. | |
1318 | * | |
1319 | * This routine returns %NULL on a failure to register, and a pointer | |
1320 | * to the table header on success. | |
1321 | */ | |
1322 | struct ctl_table_header *register_sysctl_table(ctl_table * table, | |
1323 | int insert_at_head) | |
1324 | { | |
1325 | struct ctl_table_header *tmp; | |
1326 | tmp = kmalloc(sizeof(struct ctl_table_header), GFP_KERNEL); | |
1327 | if (!tmp) | |
1328 | return NULL; | |
1329 | tmp->ctl_table = table; | |
1330 | INIT_LIST_HEAD(&tmp->ctl_entry); | |
330d57fb AV |
1331 | tmp->used = 0; |
1332 | tmp->unregistering = NULL; | |
1333 | spin_lock(&sysctl_lock); | |
1da177e4 LT |
1334 | if (insert_at_head) |
1335 | list_add(&tmp->ctl_entry, &root_table_header.ctl_entry); | |
1336 | else | |
1337 | list_add_tail(&tmp->ctl_entry, &root_table_header.ctl_entry); | |
330d57fb | 1338 | spin_unlock(&sysctl_lock); |
1da177e4 | 1339 | #ifdef CONFIG_PROC_FS |
330d57fb | 1340 | register_proc_table(table, proc_sys_root, tmp); |
1da177e4 LT |
1341 | #endif |
1342 | return tmp; | |
1343 | } | |
1344 | ||
1345 | /** | |
1346 | * unregister_sysctl_table - unregister a sysctl table hierarchy | |
1347 | * @header: the header returned from register_sysctl_table | |
1348 | * | |
1349 | * Unregisters the sysctl table and all children. proc entries may not | |
1350 | * actually be removed until they are no longer used by anyone. | |
1351 | */ | |
1352 | void unregister_sysctl_table(struct ctl_table_header * header) | |
1353 | { | |
330d57fb AV |
1354 | might_sleep(); |
1355 | spin_lock(&sysctl_lock); | |
1356 | start_unregistering(header); | |
1da177e4 LT |
1357 | #ifdef CONFIG_PROC_FS |
1358 | unregister_proc_table(header->ctl_table, proc_sys_root); | |
1359 | #endif | |
330d57fb | 1360 | spin_unlock(&sysctl_lock); |
1da177e4 LT |
1361 | kfree(header); |
1362 | } | |
1363 | ||
1364 | /* | |
1365 | * /proc/sys support | |
1366 | */ | |
1367 | ||
1368 | #ifdef CONFIG_PROC_FS | |
1369 | ||
1370 | /* Scan the sysctl entries in table and add them all into /proc */ | |
330d57fb | 1371 | static void register_proc_table(ctl_table * table, struct proc_dir_entry *root, void *set) |
1da177e4 LT |
1372 | { |
1373 | struct proc_dir_entry *de; | |
1374 | int len; | |
1375 | mode_t mode; | |
1376 | ||
1377 | for (; table->ctl_name; table++) { | |
1378 | /* Can't do anything without a proc name. */ | |
1379 | if (!table->procname) | |
1380 | continue; | |
1381 | /* Maybe we can't do anything with it... */ | |
1382 | if (!table->proc_handler && !table->child) { | |
1383 | printk(KERN_WARNING "SYSCTL: Can't register %s\n", | |
1384 | table->procname); | |
1385 | continue; | |
1386 | } | |
1387 | ||
1388 | len = strlen(table->procname); | |
1389 | mode = table->mode; | |
1390 | ||
1391 | de = NULL; | |
1392 | if (table->proc_handler) | |
1393 | mode |= S_IFREG; | |
1394 | else { | |
1395 | mode |= S_IFDIR; | |
1396 | for (de = root->subdir; de; de = de->next) { | |
1397 | if (proc_match(len, table->procname, de)) | |
1398 | break; | |
1399 | } | |
1400 | /* If the subdir exists already, de is non-NULL */ | |
1401 | } | |
1402 | ||
1403 | if (!de) { | |
1404 | de = create_proc_entry(table->procname, mode, root); | |
1405 | if (!de) | |
1406 | continue; | |
330d57fb | 1407 | de->set = set; |
1da177e4 LT |
1408 | de->data = (void *) table; |
1409 | if (table->proc_handler) | |
1410 | de->proc_fops = &proc_sys_file_operations; | |
1411 | } | |
1412 | table->de = de; | |
1413 | if (de->mode & S_IFDIR) | |
330d57fb | 1414 | register_proc_table(table->child, de, set); |
1da177e4 LT |
1415 | } |
1416 | } | |
1417 | ||
1418 | /* | |
1419 | * Unregister a /proc sysctl table and any subdirectories. | |
1420 | */ | |
1421 | static void unregister_proc_table(ctl_table * table, struct proc_dir_entry *root) | |
1422 | { | |
1423 | struct proc_dir_entry *de; | |
1424 | for (; table->ctl_name; table++) { | |
1425 | if (!(de = table->de)) | |
1426 | continue; | |
1427 | if (de->mode & S_IFDIR) { | |
1428 | if (!table->child) { | |
1429 | printk (KERN_ALERT "Help - malformed sysctl tree on free\n"); | |
1430 | continue; | |
1431 | } | |
1432 | unregister_proc_table(table->child, de); | |
1433 | ||
1434 | /* Don't unregister directories which still have entries.. */ | |
1435 | if (de->subdir) | |
1436 | continue; | |
1437 | } | |
1438 | ||
330d57fb AV |
1439 | /* |
1440 | * In any case, mark the entry as goner; we'll keep it | |
1441 | * around if it's busy, but we'll know to do nothing with | |
1442 | * its fields. We are under sysctl_lock here. | |
1443 | */ | |
1444 | de->data = NULL; | |
1445 | ||
1da177e4 LT |
1446 | /* Don't unregister proc entries that are still being used.. */ |
1447 | if (atomic_read(&de->count)) | |
1448 | continue; | |
1449 | ||
1450 | table->de = NULL; | |
1451 | remove_proc_entry(table->procname, root); | |
1452 | } | |
1453 | } | |
1454 | ||
1455 | static ssize_t do_rw_proc(int write, struct file * file, char __user * buf, | |
1456 | size_t count, loff_t *ppos) | |
1457 | { | |
1458 | int op; | |
330d57fb | 1459 | struct proc_dir_entry *de = PDE(file->f_dentry->d_inode); |
1da177e4 LT |
1460 | struct ctl_table *table; |
1461 | size_t res; | |
330d57fb | 1462 | ssize_t error = -ENOTDIR; |
1da177e4 | 1463 | |
330d57fb AV |
1464 | spin_lock(&sysctl_lock); |
1465 | if (de && de->data && use_table(de->set)) { | |
1466 | /* | |
1467 | * at that point we know that sysctl was not unregistered | |
1468 | * and won't be until we finish | |
1469 | */ | |
1470 | spin_unlock(&sysctl_lock); | |
1471 | table = (struct ctl_table *) de->data; | |
1472 | if (!table || !table->proc_handler) | |
1473 | goto out; | |
1474 | error = -EPERM; | |
1475 | op = (write ? 002 : 004); | |
1476 | if (ctl_perm(table, op)) | |
1477 | goto out; | |
1478 | ||
1479 | /* careful: calling conventions are nasty here */ | |
1480 | res = count; | |
1481 | error = (*table->proc_handler)(table, write, file, | |
1482 | buf, &res, ppos); | |
1483 | if (!error) | |
1484 | error = res; | |
1485 | out: | |
1486 | spin_lock(&sysctl_lock); | |
1487 | unuse_table(de->set); | |
1488 | } | |
1489 | spin_unlock(&sysctl_lock); | |
1490 | return error; | |
1da177e4 LT |
1491 | } |
1492 | ||
1493 | static int proc_opensys(struct inode *inode, struct file *file) | |
1494 | { | |
1495 | if (file->f_mode & FMODE_WRITE) { | |
1496 | /* | |
1497 | * sysctl entries that are not writable, | |
1498 | * are _NOT_ writable, capabilities or not. | |
1499 | */ | |
1500 | if (!(inode->i_mode & S_IWUSR)) | |
1501 | return -EPERM; | |
1502 | } | |
1503 | ||
1504 | return 0; | |
1505 | } | |
1506 | ||
1507 | static ssize_t proc_readsys(struct file * file, char __user * buf, | |
1508 | size_t count, loff_t *ppos) | |
1509 | { | |
1510 | return do_rw_proc(0, file, buf, count, ppos); | |
1511 | } | |
1512 | ||
1513 | static ssize_t proc_writesys(struct file * file, const char __user * buf, | |
1514 | size_t count, loff_t *ppos) | |
1515 | { | |
1516 | return do_rw_proc(1, file, (char __user *) buf, count, ppos); | |
1517 | } | |
1518 | ||
1519 | /** | |
1520 | * proc_dostring - read a string sysctl | |
1521 | * @table: the sysctl table | |
1522 | * @write: %TRUE if this is a write to the sysctl file | |
1523 | * @filp: the file structure | |
1524 | * @buffer: the user buffer | |
1525 | * @lenp: the size of the user buffer | |
1526 | * @ppos: file position | |
1527 | * | |
1528 | * Reads/writes a string from/to the user buffer. If the kernel | |
1529 | * buffer provided is not large enough to hold the string, the | |
1530 | * string is truncated. The copied string is %NULL-terminated. | |
1531 | * If the string is being read by the user process, it is copied | |
1532 | * and a newline '\n' is added. It is truncated if the buffer is | |
1533 | * not large enough. | |
1534 | * | |
1535 | * Returns 0 on success. | |
1536 | */ | |
1537 | int proc_dostring(ctl_table *table, int write, struct file *filp, | |
1538 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
1539 | { | |
1540 | size_t len; | |
1541 | char __user *p; | |
1542 | char c; | |
1543 | ||
1544 | if (!table->data || !table->maxlen || !*lenp || | |
1545 | (*ppos && !write)) { | |
1546 | *lenp = 0; | |
1547 | return 0; | |
1548 | } | |
1549 | ||
1550 | if (write) { | |
1551 | len = 0; | |
1552 | p = buffer; | |
1553 | while (len < *lenp) { | |
1554 | if (get_user(c, p++)) | |
1555 | return -EFAULT; | |
1556 | if (c == 0 || c == '\n') | |
1557 | break; | |
1558 | len++; | |
1559 | } | |
1560 | if (len >= table->maxlen) | |
1561 | len = table->maxlen-1; | |
1562 | if(copy_from_user(table->data, buffer, len)) | |
1563 | return -EFAULT; | |
1564 | ((char *) table->data)[len] = 0; | |
1565 | *ppos += *lenp; | |
1566 | } else { | |
1567 | len = strlen(table->data); | |
1568 | if (len > table->maxlen) | |
1569 | len = table->maxlen; | |
1570 | if (len > *lenp) | |
1571 | len = *lenp; | |
1572 | if (len) | |
1573 | if(copy_to_user(buffer, table->data, len)) | |
1574 | return -EFAULT; | |
1575 | if (len < *lenp) { | |
1576 | if(put_user('\n', ((char __user *) buffer) + len)) | |
1577 | return -EFAULT; | |
1578 | len++; | |
1579 | } | |
1580 | *lenp = len; | |
1581 | *ppos += len; | |
1582 | } | |
1583 | return 0; | |
1584 | } | |
1585 | ||
1586 | /* | |
1587 | * Special case of dostring for the UTS structure. This has locks | |
1588 | * to observe. Should this be in kernel/sys.c ???? | |
1589 | */ | |
1590 | ||
1591 | static int proc_doutsstring(ctl_table *table, int write, struct file *filp, | |
1592 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
1593 | { | |
1594 | int r; | |
1595 | ||
1596 | if (!write) { | |
1597 | down_read(&uts_sem); | |
1598 | r=proc_dostring(table,0,filp,buffer,lenp, ppos); | |
1599 | up_read(&uts_sem); | |
1600 | } else { | |
1601 | down_write(&uts_sem); | |
1602 | r=proc_dostring(table,1,filp,buffer,lenp, ppos); | |
1603 | up_write(&uts_sem); | |
1604 | } | |
1605 | return r; | |
1606 | } | |
1607 | ||
1608 | static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp, | |
1609 | int *valp, | |
1610 | int write, void *data) | |
1611 | { | |
1612 | if (write) { | |
1613 | *valp = *negp ? -*lvalp : *lvalp; | |
1614 | } else { | |
1615 | int val = *valp; | |
1616 | if (val < 0) { | |
1617 | *negp = -1; | |
1618 | *lvalp = (unsigned long)-val; | |
1619 | } else { | |
1620 | *negp = 0; | |
1621 | *lvalp = (unsigned long)val; | |
1622 | } | |
1623 | } | |
1624 | return 0; | |
1625 | } | |
1626 | ||
1627 | static int do_proc_dointvec(ctl_table *table, int write, struct file *filp, | |
1628 | void __user *buffer, size_t *lenp, loff_t *ppos, | |
1629 | int (*conv)(int *negp, unsigned long *lvalp, int *valp, | |
1630 | int write, void *data), | |
1631 | void *data) | |
1632 | { | |
1633 | #define TMPBUFLEN 21 | |
1634 | int *i, vleft, first=1, neg, val; | |
1635 | unsigned long lval; | |
1636 | size_t left, len; | |
1637 | ||
1638 | char buf[TMPBUFLEN], *p; | |
1639 | char __user *s = buffer; | |
1640 | ||
1641 | if (!table->data || !table->maxlen || !*lenp || | |
1642 | (*ppos && !write)) { | |
1643 | *lenp = 0; | |
1644 | return 0; | |
1645 | } | |
1646 | ||
1647 | i = (int *) table->data; | |
1648 | vleft = table->maxlen / sizeof(*i); | |
1649 | left = *lenp; | |
1650 | ||
1651 | if (!conv) | |
1652 | conv = do_proc_dointvec_conv; | |
1653 | ||
1654 | for (; left && vleft--; i++, first=0) { | |
1655 | if (write) { | |
1656 | while (left) { | |
1657 | char c; | |
1658 | if (get_user(c, s)) | |
1659 | return -EFAULT; | |
1660 | if (!isspace(c)) | |
1661 | break; | |
1662 | left--; | |
1663 | s++; | |
1664 | } | |
1665 | if (!left) | |
1666 | break; | |
1667 | neg = 0; | |
1668 | len = left; | |
1669 | if (len > sizeof(buf) - 1) | |
1670 | len = sizeof(buf) - 1; | |
1671 | if (copy_from_user(buf, s, len)) | |
1672 | return -EFAULT; | |
1673 | buf[len] = 0; | |
1674 | p = buf; | |
1675 | if (*p == '-' && left > 1) { | |
1676 | neg = 1; | |
1677 | left--, p++; | |
1678 | } | |
1679 | if (*p < '0' || *p > '9') | |
1680 | break; | |
1681 | ||
1682 | lval = simple_strtoul(p, &p, 0); | |
1683 | ||
1684 | len = p-buf; | |
1685 | if ((len < left) && *p && !isspace(*p)) | |
1686 | break; | |
1687 | if (neg) | |
1688 | val = -val; | |
1689 | s += len; | |
1690 | left -= len; | |
1691 | ||
1692 | if (conv(&neg, &lval, i, 1, data)) | |
1693 | break; | |
1694 | } else { | |
1695 | p = buf; | |
1696 | if (!first) | |
1697 | *p++ = '\t'; | |
1698 | ||
1699 | if (conv(&neg, &lval, i, 0, data)) | |
1700 | break; | |
1701 | ||
1702 | sprintf(p, "%s%lu", neg ? "-" : "", lval); | |
1703 | len = strlen(buf); | |
1704 | if (len > left) | |
1705 | len = left; | |
1706 | if(copy_to_user(s, buf, len)) | |
1707 | return -EFAULT; | |
1708 | left -= len; | |
1709 | s += len; | |
1710 | } | |
1711 | } | |
1712 | ||
1713 | if (!write && !first && left) { | |
1714 | if(put_user('\n', s)) | |
1715 | return -EFAULT; | |
1716 | left--, s++; | |
1717 | } | |
1718 | if (write) { | |
1719 | while (left) { | |
1720 | char c; | |
1721 | if (get_user(c, s++)) | |
1722 | return -EFAULT; | |
1723 | if (!isspace(c)) | |
1724 | break; | |
1725 | left--; | |
1726 | } | |
1727 | } | |
1728 | if (write && first) | |
1729 | return -EINVAL; | |
1730 | *lenp -= left; | |
1731 | *ppos += *lenp; | |
1732 | return 0; | |
1733 | #undef TMPBUFLEN | |
1734 | } | |
1735 | ||
1736 | /** | |
1737 | * proc_dointvec - read a vector of integers | |
1738 | * @table: the sysctl table | |
1739 | * @write: %TRUE if this is a write to the sysctl file | |
1740 | * @filp: the file structure | |
1741 | * @buffer: the user buffer | |
1742 | * @lenp: the size of the user buffer | |
1743 | * @ppos: file position | |
1744 | * | |
1745 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer | |
1746 | * values from/to the user buffer, treated as an ASCII string. | |
1747 | * | |
1748 | * Returns 0 on success. | |
1749 | */ | |
1750 | int proc_dointvec(ctl_table *table, int write, struct file *filp, | |
1751 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
1752 | { | |
1753 | return do_proc_dointvec(table,write,filp,buffer,lenp,ppos, | |
1754 | NULL,NULL); | |
1755 | } | |
1756 | ||
1757 | #define OP_SET 0 | |
1758 | #define OP_AND 1 | |
1759 | #define OP_OR 2 | |
1760 | #define OP_MAX 3 | |
1761 | #define OP_MIN 4 | |
1762 | ||
1763 | static int do_proc_dointvec_bset_conv(int *negp, unsigned long *lvalp, | |
1764 | int *valp, | |
1765 | int write, void *data) | |
1766 | { | |
1767 | int op = *(int *)data; | |
1768 | if (write) { | |
1769 | int val = *negp ? -*lvalp : *lvalp; | |
1770 | switch(op) { | |
1771 | case OP_SET: *valp = val; break; | |
1772 | case OP_AND: *valp &= val; break; | |
1773 | case OP_OR: *valp |= val; break; | |
1774 | case OP_MAX: if(*valp < val) | |
1775 | *valp = val; | |
1776 | break; | |
1777 | case OP_MIN: if(*valp > val) | |
1778 | *valp = val; | |
1779 | break; | |
1780 | } | |
1781 | } else { | |
1782 | int val = *valp; | |
1783 | if (val < 0) { | |
1784 | *negp = -1; | |
1785 | *lvalp = (unsigned long)-val; | |
1786 | } else { | |
1787 | *negp = 0; | |
1788 | *lvalp = (unsigned long)val; | |
1789 | } | |
1790 | } | |
1791 | return 0; | |
1792 | } | |
1793 | ||
1794 | /* | |
1795 | * init may raise the set. | |
1796 | */ | |
1797 | ||
1798 | int proc_dointvec_bset(ctl_table *table, int write, struct file *filp, | |
1799 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
1800 | { | |
1801 | int op; | |
1802 | ||
1803 | if (!capable(CAP_SYS_MODULE)) { | |
1804 | return -EPERM; | |
1805 | } | |
1806 | ||
1807 | op = (current->pid == 1) ? OP_SET : OP_AND; | |
1808 | return do_proc_dointvec(table,write,filp,buffer,lenp,ppos, | |
1809 | do_proc_dointvec_bset_conv,&op); | |
1810 | } | |
1811 | ||
1812 | struct do_proc_dointvec_minmax_conv_param { | |
1813 | int *min; | |
1814 | int *max; | |
1815 | }; | |
1816 | ||
1817 | static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp, | |
1818 | int *valp, | |
1819 | int write, void *data) | |
1820 | { | |
1821 | struct do_proc_dointvec_minmax_conv_param *param = data; | |
1822 | if (write) { | |
1823 | int val = *negp ? -*lvalp : *lvalp; | |
1824 | if ((param->min && *param->min > val) || | |
1825 | (param->max && *param->max < val)) | |
1826 | return -EINVAL; | |
1827 | *valp = val; | |
1828 | } else { | |
1829 | int val = *valp; | |
1830 | if (val < 0) { | |
1831 | *negp = -1; | |
1832 | *lvalp = (unsigned long)-val; | |
1833 | } else { | |
1834 | *negp = 0; | |
1835 | *lvalp = (unsigned long)val; | |
1836 | } | |
1837 | } | |
1838 | return 0; | |
1839 | } | |
1840 | ||
1841 | /** | |
1842 | * proc_dointvec_minmax - read a vector of integers with min/max values | |
1843 | * @table: the sysctl table | |
1844 | * @write: %TRUE if this is a write to the sysctl file | |
1845 | * @filp: the file structure | |
1846 | * @buffer: the user buffer | |
1847 | * @lenp: the size of the user buffer | |
1848 | * @ppos: file position | |
1849 | * | |
1850 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer | |
1851 | * values from/to the user buffer, treated as an ASCII string. | |
1852 | * | |
1853 | * This routine will ensure the values are within the range specified by | |
1854 | * table->extra1 (min) and table->extra2 (max). | |
1855 | * | |
1856 | * Returns 0 on success. | |
1857 | */ | |
1858 | int proc_dointvec_minmax(ctl_table *table, int write, struct file *filp, | |
1859 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
1860 | { | |
1861 | struct do_proc_dointvec_minmax_conv_param param = { | |
1862 | .min = (int *) table->extra1, | |
1863 | .max = (int *) table->extra2, | |
1864 | }; | |
1865 | return do_proc_dointvec(table, write, filp, buffer, lenp, ppos, | |
1866 | do_proc_dointvec_minmax_conv, ¶m); | |
1867 | } | |
1868 | ||
1869 | static int do_proc_doulongvec_minmax(ctl_table *table, int write, | |
1870 | struct file *filp, | |
1871 | void __user *buffer, | |
1872 | size_t *lenp, loff_t *ppos, | |
1873 | unsigned long convmul, | |
1874 | unsigned long convdiv) | |
1875 | { | |
1876 | #define TMPBUFLEN 21 | |
1877 | unsigned long *i, *min, *max, val; | |
1878 | int vleft, first=1, neg; | |
1879 | size_t len, left; | |
1880 | char buf[TMPBUFLEN], *p; | |
1881 | char __user *s = buffer; | |
1882 | ||
1883 | if (!table->data || !table->maxlen || !*lenp || | |
1884 | (*ppos && !write)) { | |
1885 | *lenp = 0; | |
1886 | return 0; | |
1887 | } | |
1888 | ||
1889 | i = (unsigned long *) table->data; | |
1890 | min = (unsigned long *) table->extra1; | |
1891 | max = (unsigned long *) table->extra2; | |
1892 | vleft = table->maxlen / sizeof(unsigned long); | |
1893 | left = *lenp; | |
1894 | ||
1895 | for (; left && vleft--; i++, min++, max++, first=0) { | |
1896 | if (write) { | |
1897 | while (left) { | |
1898 | char c; | |
1899 | if (get_user(c, s)) | |
1900 | return -EFAULT; | |
1901 | if (!isspace(c)) | |
1902 | break; | |
1903 | left--; | |
1904 | s++; | |
1905 | } | |
1906 | if (!left) | |
1907 | break; | |
1908 | neg = 0; | |
1909 | len = left; | |
1910 | if (len > TMPBUFLEN-1) | |
1911 | len = TMPBUFLEN-1; | |
1912 | if (copy_from_user(buf, s, len)) | |
1913 | return -EFAULT; | |
1914 | buf[len] = 0; | |
1915 | p = buf; | |
1916 | if (*p == '-' && left > 1) { | |
1917 | neg = 1; | |
1918 | left--, p++; | |
1919 | } | |
1920 | if (*p < '0' || *p > '9') | |
1921 | break; | |
1922 | val = simple_strtoul(p, &p, 0) * convmul / convdiv ; | |
1923 | len = p-buf; | |
1924 | if ((len < left) && *p && !isspace(*p)) | |
1925 | break; | |
1926 | if (neg) | |
1927 | val = -val; | |
1928 | s += len; | |
1929 | left -= len; | |
1930 | ||
1931 | if(neg) | |
1932 | continue; | |
1933 | if ((min && val < *min) || (max && val > *max)) | |
1934 | continue; | |
1935 | *i = val; | |
1936 | } else { | |
1937 | p = buf; | |
1938 | if (!first) | |
1939 | *p++ = '\t'; | |
1940 | sprintf(p, "%lu", convdiv * (*i) / convmul); | |
1941 | len = strlen(buf); | |
1942 | if (len > left) | |
1943 | len = left; | |
1944 | if(copy_to_user(s, buf, len)) | |
1945 | return -EFAULT; | |
1946 | left -= len; | |
1947 | s += len; | |
1948 | } | |
1949 | } | |
1950 | ||
1951 | if (!write && !first && left) { | |
1952 | if(put_user('\n', s)) | |
1953 | return -EFAULT; | |
1954 | left--, s++; | |
1955 | } | |
1956 | if (write) { | |
1957 | while (left) { | |
1958 | char c; | |
1959 | if (get_user(c, s++)) | |
1960 | return -EFAULT; | |
1961 | if (!isspace(c)) | |
1962 | break; | |
1963 | left--; | |
1964 | } | |
1965 | } | |
1966 | if (write && first) | |
1967 | return -EINVAL; | |
1968 | *lenp -= left; | |
1969 | *ppos += *lenp; | |
1970 | return 0; | |
1971 | #undef TMPBUFLEN | |
1972 | } | |
1973 | ||
1974 | /** | |
1975 | * proc_doulongvec_minmax - read a vector of long integers with min/max values | |
1976 | * @table: the sysctl table | |
1977 | * @write: %TRUE if this is a write to the sysctl file | |
1978 | * @filp: the file structure | |
1979 | * @buffer: the user buffer | |
1980 | * @lenp: the size of the user buffer | |
1981 | * @ppos: file position | |
1982 | * | |
1983 | * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long | |
1984 | * values from/to the user buffer, treated as an ASCII string. | |
1985 | * | |
1986 | * This routine will ensure the values are within the range specified by | |
1987 | * table->extra1 (min) and table->extra2 (max). | |
1988 | * | |
1989 | * Returns 0 on success. | |
1990 | */ | |
1991 | int proc_doulongvec_minmax(ctl_table *table, int write, struct file *filp, | |
1992 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
1993 | { | |
1994 | return do_proc_doulongvec_minmax(table, write, filp, buffer, lenp, ppos, 1l, 1l); | |
1995 | } | |
1996 | ||
1997 | /** | |
1998 | * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values | |
1999 | * @table: the sysctl table | |
2000 | * @write: %TRUE if this is a write to the sysctl file | |
2001 | * @filp: the file structure | |
2002 | * @buffer: the user buffer | |
2003 | * @lenp: the size of the user buffer | |
2004 | * @ppos: file position | |
2005 | * | |
2006 | * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long | |
2007 | * values from/to the user buffer, treated as an ASCII string. The values | |
2008 | * are treated as milliseconds, and converted to jiffies when they are stored. | |
2009 | * | |
2010 | * This routine will ensure the values are within the range specified by | |
2011 | * table->extra1 (min) and table->extra2 (max). | |
2012 | * | |
2013 | * Returns 0 on success. | |
2014 | */ | |
2015 | int proc_doulongvec_ms_jiffies_minmax(ctl_table *table, int write, | |
2016 | struct file *filp, | |
2017 | void __user *buffer, | |
2018 | size_t *lenp, loff_t *ppos) | |
2019 | { | |
2020 | return do_proc_doulongvec_minmax(table, write, filp, buffer, | |
2021 | lenp, ppos, HZ, 1000l); | |
2022 | } | |
2023 | ||
2024 | ||
2025 | static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp, | |
2026 | int *valp, | |
2027 | int write, void *data) | |
2028 | { | |
2029 | if (write) { | |
2030 | *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ); | |
2031 | } else { | |
2032 | int val = *valp; | |
2033 | unsigned long lval; | |
2034 | if (val < 0) { | |
2035 | *negp = -1; | |
2036 | lval = (unsigned long)-val; | |
2037 | } else { | |
2038 | *negp = 0; | |
2039 | lval = (unsigned long)val; | |
2040 | } | |
2041 | *lvalp = lval / HZ; | |
2042 | } | |
2043 | return 0; | |
2044 | } | |
2045 | ||
2046 | static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp, | |
2047 | int *valp, | |
2048 | int write, void *data) | |
2049 | { | |
2050 | if (write) { | |
2051 | *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp); | |
2052 | } else { | |
2053 | int val = *valp; | |
2054 | unsigned long lval; | |
2055 | if (val < 0) { | |
2056 | *negp = -1; | |
2057 | lval = (unsigned long)-val; | |
2058 | } else { | |
2059 | *negp = 0; | |
2060 | lval = (unsigned long)val; | |
2061 | } | |
2062 | *lvalp = jiffies_to_clock_t(lval); | |
2063 | } | |
2064 | return 0; | |
2065 | } | |
2066 | ||
2067 | static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp, | |
2068 | int *valp, | |
2069 | int write, void *data) | |
2070 | { | |
2071 | if (write) { | |
2072 | *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp); | |
2073 | } else { | |
2074 | int val = *valp; | |
2075 | unsigned long lval; | |
2076 | if (val < 0) { | |
2077 | *negp = -1; | |
2078 | lval = (unsigned long)-val; | |
2079 | } else { | |
2080 | *negp = 0; | |
2081 | lval = (unsigned long)val; | |
2082 | } | |
2083 | *lvalp = jiffies_to_msecs(lval); | |
2084 | } | |
2085 | return 0; | |
2086 | } | |
2087 | ||
2088 | /** | |
2089 | * proc_dointvec_jiffies - read a vector of integers as seconds | |
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 int) integer | |
2098 | * values from/to the user buffer, treated as an ASCII string. | |
2099 | * The values read are assumed to be in seconds, and are converted into | |
2100 | * jiffies. | |
2101 | * | |
2102 | * Returns 0 on success. | |
2103 | */ | |
2104 | int proc_dointvec_jiffies(ctl_table *table, int write, struct file *filp, | |
2105 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2106 | { | |
2107 | return do_proc_dointvec(table,write,filp,buffer,lenp,ppos, | |
2108 | do_proc_dointvec_jiffies_conv,NULL); | |
2109 | } | |
2110 | ||
2111 | /** | |
2112 | * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds | |
2113 | * @table: the sysctl table | |
2114 | * @write: %TRUE if this is a write to the sysctl file | |
2115 | * @filp: the file structure | |
2116 | * @buffer: the user buffer | |
2117 | * @lenp: the size of the user buffer | |
1e5d5331 | 2118 | * @ppos: pointer to the file position |
1da177e4 LT |
2119 | * |
2120 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer | |
2121 | * values from/to the user buffer, treated as an ASCII string. | |
2122 | * The values read are assumed to be in 1/USER_HZ seconds, and | |
2123 | * are converted into jiffies. | |
2124 | * | |
2125 | * Returns 0 on success. | |
2126 | */ | |
2127 | int proc_dointvec_userhz_jiffies(ctl_table *table, int write, struct file *filp, | |
2128 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2129 | { | |
2130 | return do_proc_dointvec(table,write,filp,buffer,lenp,ppos, | |
2131 | do_proc_dointvec_userhz_jiffies_conv,NULL); | |
2132 | } | |
2133 | ||
2134 | /** | |
2135 | * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds | |
2136 | * @table: the sysctl table | |
2137 | * @write: %TRUE if this is a write to the sysctl file | |
2138 | * @filp: the file structure | |
2139 | * @buffer: the user buffer | |
2140 | * @lenp: the size of the user buffer | |
67be2dd1 MW |
2141 | * @ppos: file position |
2142 | * @ppos: the current position in the file | |
1da177e4 LT |
2143 | * |
2144 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer | |
2145 | * values from/to the user buffer, treated as an ASCII string. | |
2146 | * The values read are assumed to be in 1/1000 seconds, and | |
2147 | * are converted into jiffies. | |
2148 | * | |
2149 | * Returns 0 on success. | |
2150 | */ | |
2151 | int proc_dointvec_ms_jiffies(ctl_table *table, int write, struct file *filp, | |
2152 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2153 | { | |
2154 | return do_proc_dointvec(table, write, filp, buffer, lenp, ppos, | |
2155 | do_proc_dointvec_ms_jiffies_conv, NULL); | |
2156 | } | |
2157 | ||
2158 | #else /* CONFIG_PROC_FS */ | |
2159 | ||
2160 | int proc_dostring(ctl_table *table, int write, struct file *filp, | |
2161 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2162 | { | |
2163 | return -ENOSYS; | |
2164 | } | |
2165 | ||
2166 | static int proc_doutsstring(ctl_table *table, int write, struct file *filp, | |
2167 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2168 | { | |
2169 | return -ENOSYS; | |
2170 | } | |
2171 | ||
2172 | int proc_dointvec(ctl_table *table, int write, struct file *filp, | |
2173 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2174 | { | |
2175 | return -ENOSYS; | |
2176 | } | |
2177 | ||
2178 | int proc_dointvec_bset(ctl_table *table, int write, struct file *filp, | |
2179 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2180 | { | |
2181 | return -ENOSYS; | |
2182 | } | |
2183 | ||
2184 | int proc_dointvec_minmax(ctl_table *table, int write, struct file *filp, | |
2185 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2186 | { | |
2187 | return -ENOSYS; | |
2188 | } | |
2189 | ||
2190 | int proc_dointvec_jiffies(ctl_table *table, int write, struct file *filp, | |
2191 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2192 | { | |
2193 | return -ENOSYS; | |
2194 | } | |
2195 | ||
2196 | int proc_dointvec_userhz_jiffies(ctl_table *table, int write, struct file *filp, | |
2197 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2198 | { | |
2199 | return -ENOSYS; | |
2200 | } | |
2201 | ||
2202 | int proc_dointvec_ms_jiffies(ctl_table *table, int write, struct file *filp, | |
2203 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2204 | { | |
2205 | return -ENOSYS; | |
2206 | } | |
2207 | ||
2208 | int proc_doulongvec_minmax(ctl_table *table, int write, struct file *filp, | |
2209 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2210 | { | |
2211 | return -ENOSYS; | |
2212 | } | |
2213 | ||
2214 | int proc_doulongvec_ms_jiffies_minmax(ctl_table *table, int write, | |
2215 | struct file *filp, | |
2216 | void __user *buffer, | |
2217 | size_t *lenp, loff_t *ppos) | |
2218 | { | |
2219 | return -ENOSYS; | |
2220 | } | |
2221 | ||
2222 | ||
2223 | #endif /* CONFIG_PROC_FS */ | |
2224 | ||
2225 | ||
2226 | /* | |
2227 | * General sysctl support routines | |
2228 | */ | |
2229 | ||
2230 | /* The generic string strategy routine: */ | |
2231 | int sysctl_string(ctl_table *table, int __user *name, int nlen, | |
2232 | void __user *oldval, size_t __user *oldlenp, | |
2233 | void __user *newval, size_t newlen, void **context) | |
2234 | { | |
1da177e4 LT |
2235 | if (!table->data || !table->maxlen) |
2236 | return -ENOTDIR; | |
2237 | ||
2238 | if (oldval && oldlenp) { | |
de9e007d LT |
2239 | size_t bufsize; |
2240 | if (get_user(bufsize, oldlenp)) | |
1da177e4 | 2241 | return -EFAULT; |
de9e007d LT |
2242 | if (bufsize) { |
2243 | size_t len = strlen(table->data), copied; | |
2244 | ||
2245 | /* This shouldn't trigger for a well-formed sysctl */ | |
2246 | if (len > table->maxlen) | |
1da177e4 | 2247 | len = table->maxlen; |
de9e007d LT |
2248 | |
2249 | /* Copy up to a max of bufsize-1 bytes of the string */ | |
2250 | copied = (len >= bufsize) ? bufsize - 1 : len; | |
2251 | ||
2252 | if (copy_to_user(oldval, table->data, copied) || | |
2253 | put_user(0, (char __user *)(oldval + copied))) | |
1da177e4 | 2254 | return -EFAULT; |
de9e007d | 2255 | if (put_user(len, oldlenp)) |
1da177e4 LT |
2256 | return -EFAULT; |
2257 | } | |
2258 | } | |
2259 | if (newval && newlen) { | |
de9e007d | 2260 | size_t len = newlen; |
1da177e4 LT |
2261 | if (len > table->maxlen) |
2262 | len = table->maxlen; | |
2263 | if(copy_from_user(table->data, newval, len)) | |
2264 | return -EFAULT; | |
2265 | if (len == table->maxlen) | |
2266 | len--; | |
2267 | ((char *) table->data)[len] = 0; | |
2268 | } | |
82c9df82 | 2269 | return 1; |
1da177e4 LT |
2270 | } |
2271 | ||
2272 | /* | |
2273 | * This function makes sure that all of the integers in the vector | |
2274 | * are between the minimum and maximum values given in the arrays | |
2275 | * table->extra1 and table->extra2, respectively. | |
2276 | */ | |
2277 | int sysctl_intvec(ctl_table *table, int __user *name, int nlen, | |
2278 | void __user *oldval, size_t __user *oldlenp, | |
2279 | void __user *newval, size_t newlen, void **context) | |
2280 | { | |
2281 | ||
2282 | if (newval && newlen) { | |
2283 | int __user *vec = (int __user *) newval; | |
2284 | int *min = (int *) table->extra1; | |
2285 | int *max = (int *) table->extra2; | |
2286 | size_t length; | |
2287 | int i; | |
2288 | ||
2289 | if (newlen % sizeof(int) != 0) | |
2290 | return -EINVAL; | |
2291 | ||
2292 | if (!table->extra1 && !table->extra2) | |
2293 | return 0; | |
2294 | ||
2295 | if (newlen > table->maxlen) | |
2296 | newlen = table->maxlen; | |
2297 | length = newlen / sizeof(int); | |
2298 | ||
2299 | for (i = 0; i < length; i++) { | |
2300 | int value; | |
2301 | if (get_user(value, vec + i)) | |
2302 | return -EFAULT; | |
2303 | if (min && value < min[i]) | |
2304 | return -EINVAL; | |
2305 | if (max && value > max[i]) | |
2306 | return -EINVAL; | |
2307 | } | |
2308 | } | |
2309 | return 0; | |
2310 | } | |
2311 | ||
2312 | /* Strategy function to convert jiffies to seconds */ | |
2313 | int sysctl_jiffies(ctl_table *table, int __user *name, int nlen, | |
2314 | void __user *oldval, size_t __user *oldlenp, | |
2315 | void __user *newval, size_t newlen, void **context) | |
2316 | { | |
2317 | if (oldval) { | |
2318 | size_t olen; | |
2319 | if (oldlenp) { | |
2320 | if (get_user(olen, oldlenp)) | |
2321 | return -EFAULT; | |
2322 | if (olen!=sizeof(int)) | |
2323 | return -EINVAL; | |
2324 | } | |
2325 | if (put_user(*(int *)(table->data)/HZ, (int __user *)oldval) || | |
2326 | (oldlenp && put_user(sizeof(int),oldlenp))) | |
2327 | return -EFAULT; | |
2328 | } | |
2329 | if (newval && newlen) { | |
2330 | int new; | |
2331 | if (newlen != sizeof(int)) | |
2332 | return -EINVAL; | |
2333 | if (get_user(new, (int __user *)newval)) | |
2334 | return -EFAULT; | |
2335 | *(int *)(table->data) = new*HZ; | |
2336 | } | |
2337 | return 1; | |
2338 | } | |
2339 | ||
2340 | /* Strategy function to convert jiffies to seconds */ | |
2341 | int sysctl_ms_jiffies(ctl_table *table, int __user *name, int nlen, | |
2342 | void __user *oldval, size_t __user *oldlenp, | |
2343 | void __user *newval, size_t newlen, void **context) | |
2344 | { | |
2345 | if (oldval) { | |
2346 | size_t olen; | |
2347 | if (oldlenp) { | |
2348 | if (get_user(olen, oldlenp)) | |
2349 | return -EFAULT; | |
2350 | if (olen!=sizeof(int)) | |
2351 | return -EINVAL; | |
2352 | } | |
2353 | if (put_user(jiffies_to_msecs(*(int *)(table->data)), (int __user *)oldval) || | |
2354 | (oldlenp && put_user(sizeof(int),oldlenp))) | |
2355 | return -EFAULT; | |
2356 | } | |
2357 | if (newval && newlen) { | |
2358 | int new; | |
2359 | if (newlen != sizeof(int)) | |
2360 | return -EINVAL; | |
2361 | if (get_user(new, (int __user *)newval)) | |
2362 | return -EFAULT; | |
2363 | *(int *)(table->data) = msecs_to_jiffies(new); | |
2364 | } | |
2365 | return 1; | |
2366 | } | |
2367 | ||
2368 | #else /* CONFIG_SYSCTL */ | |
2369 | ||
2370 | ||
2371 | asmlinkage long sys_sysctl(struct __sysctl_args __user *args) | |
2372 | { | |
2373 | return -ENOSYS; | |
2374 | } | |
2375 | ||
2376 | int sysctl_string(ctl_table *table, int __user *name, int nlen, | |
2377 | void __user *oldval, size_t __user *oldlenp, | |
2378 | void __user *newval, size_t newlen, void **context) | |
2379 | { | |
2380 | return -ENOSYS; | |
2381 | } | |
2382 | ||
2383 | int sysctl_intvec(ctl_table *table, int __user *name, int nlen, | |
2384 | void __user *oldval, size_t __user *oldlenp, | |
2385 | void __user *newval, size_t newlen, void **context) | |
2386 | { | |
2387 | return -ENOSYS; | |
2388 | } | |
2389 | ||
2390 | int sysctl_jiffies(ctl_table *table, int __user *name, int nlen, | |
2391 | void __user *oldval, size_t __user *oldlenp, | |
2392 | void __user *newval, size_t newlen, void **context) | |
2393 | { | |
2394 | return -ENOSYS; | |
2395 | } | |
2396 | ||
2397 | int sysctl_ms_jiffies(ctl_table *table, int __user *name, int nlen, | |
2398 | void __user *oldval, size_t __user *oldlenp, | |
2399 | void __user *newval, size_t newlen, void **context) | |
2400 | { | |
2401 | return -ENOSYS; | |
2402 | } | |
2403 | ||
2404 | int proc_dostring(ctl_table *table, int write, struct file *filp, | |
2405 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2406 | { | |
2407 | return -ENOSYS; | |
2408 | } | |
2409 | ||
2410 | int proc_dointvec(ctl_table *table, int write, struct file *filp, | |
2411 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2412 | { | |
2413 | return -ENOSYS; | |
2414 | } | |
2415 | ||
2416 | int proc_dointvec_bset(ctl_table *table, int write, struct file *filp, | |
2417 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2418 | { | |
2419 | return -ENOSYS; | |
2420 | } | |
2421 | ||
2422 | int proc_dointvec_minmax(ctl_table *table, int write, struct file *filp, | |
2423 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2424 | { | |
2425 | return -ENOSYS; | |
2426 | } | |
2427 | ||
2428 | int proc_dointvec_jiffies(ctl_table *table, int write, struct file *filp, | |
2429 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2430 | { | |
2431 | return -ENOSYS; | |
2432 | } | |
2433 | ||
2434 | int proc_dointvec_userhz_jiffies(ctl_table *table, int write, struct file *filp, | |
2435 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2436 | { | |
2437 | return -ENOSYS; | |
2438 | } | |
2439 | ||
2440 | int proc_dointvec_ms_jiffies(ctl_table *table, int write, struct file *filp, | |
2441 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2442 | { | |
2443 | return -ENOSYS; | |
2444 | } | |
2445 | ||
2446 | int proc_doulongvec_minmax(ctl_table *table, int write, struct file *filp, | |
2447 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2448 | { | |
2449 | return -ENOSYS; | |
2450 | } | |
2451 | ||
2452 | int proc_doulongvec_ms_jiffies_minmax(ctl_table *table, int write, | |
2453 | struct file *filp, | |
2454 | void __user *buffer, | |
2455 | size_t *lenp, loff_t *ppos) | |
2456 | { | |
2457 | return -ENOSYS; | |
2458 | } | |
2459 | ||
2460 | struct ctl_table_header * register_sysctl_table(ctl_table * table, | |
2461 | int insert_at_head) | |
2462 | { | |
2463 | return NULL; | |
2464 | } | |
2465 | ||
2466 | void unregister_sysctl_table(struct ctl_table_header * table) | |
2467 | { | |
2468 | } | |
2469 | ||
2470 | #endif /* CONFIG_SYSCTL */ | |
2471 | ||
2472 | /* | |
2473 | * No sense putting this after each symbol definition, twice, | |
2474 | * exception granted :-) | |
2475 | */ | |
2476 | EXPORT_SYMBOL(proc_dointvec); | |
2477 | EXPORT_SYMBOL(proc_dointvec_jiffies); | |
2478 | EXPORT_SYMBOL(proc_dointvec_minmax); | |
2479 | EXPORT_SYMBOL(proc_dointvec_userhz_jiffies); | |
2480 | EXPORT_SYMBOL(proc_dointvec_ms_jiffies); | |
2481 | EXPORT_SYMBOL(proc_dostring); | |
2482 | EXPORT_SYMBOL(proc_doulongvec_minmax); | |
2483 | EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax); | |
2484 | EXPORT_SYMBOL(register_sysctl_table); | |
2485 | EXPORT_SYMBOL(sysctl_intvec); | |
2486 | EXPORT_SYMBOL(sysctl_jiffies); | |
2487 | EXPORT_SYMBOL(sysctl_ms_jiffies); | |
2488 | EXPORT_SYMBOL(sysctl_string); | |
2489 | EXPORT_SYMBOL(unregister_sysctl_table); |