Contents of /alx-src/tags/kernel26-2.6.12-alx-r9/kernel/sysctl.c
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Wed Mar 4 11:03:09 2009 UTC (15 years, 3 months ago) by niro
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Wed Mar 4 11:03:09 2009 UTC (15 years, 3 months ago) by niro
File MIME type: text/plain
File size: 56348 byte(s)
Tag kernel26-2.6.12-alx-r9
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> |
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> |
34 | #include <linux/sysrq.h> |
35 | #include <linux/highuid.h> |
36 | #include <linux/writeback.h> |
37 | #include <linux/hugetlb.h> |
38 | #include <linux/security.h> |
39 | #include <linux/initrd.h> |
40 | #include <linux/times.h> |
41 | #include <linux/limits.h> |
42 | #include <linux/dcache.h> |
43 | #include <linux/syscalls.h> |
44 | |
45 | #include <asm/uaccess.h> |
46 | #include <asm/processor.h> |
47 | |
48 | #ifdef CONFIG_ROOT_NFS |
49 | #include <linux/nfs_fs.h> |
50 | #endif |
51 | |
52 | #if defined(CONFIG_SYSCTL) |
53 | |
54 | /* External variables not in a header file. */ |
55 | extern int C_A_D; |
56 | extern int sysctl_overcommit_memory; |
57 | extern int sysctl_overcommit_ratio; |
58 | extern int max_threads; |
59 | extern int sysrq_enabled; |
60 | extern int core_uses_pid; |
61 | extern char core_pattern[]; |
62 | extern int cad_pid; |
63 | extern int pid_max; |
64 | extern int min_free_kbytes; |
65 | extern int printk_ratelimit_jiffies; |
66 | extern int printk_ratelimit_burst; |
67 | extern int pid_max_min, pid_max_max; |
68 | |
69 | #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86) |
70 | int unknown_nmi_panic; |
71 | extern int proc_unknown_nmi_panic(ctl_table *, int, struct file *, |
72 | void __user *, size_t *, loff_t *); |
73 | #endif |
74 | |
75 | /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */ |
76 | static int maxolduid = 65535; |
77 | static int minolduid; |
78 | |
79 | static int ngroups_max = NGROUPS_MAX; |
80 | |
81 | #ifdef CONFIG_KMOD |
82 | extern char modprobe_path[]; |
83 | #endif |
84 | #ifdef CONFIG_HOTPLUG |
85 | extern char hotplug_path[]; |
86 | #endif |
87 | #ifdef CONFIG_FB_SPLASH |
88 | extern char fbsplash_path[]; |
89 | #endif |
90 | #ifdef CONFIG_CHR_DEV_SG |
91 | extern int sg_big_buff; |
92 | #endif |
93 | #ifdef CONFIG_SYSVIPC |
94 | extern size_t shm_ctlmax; |
95 | extern size_t shm_ctlall; |
96 | extern int shm_ctlmni; |
97 | extern int msg_ctlmax; |
98 | extern int msg_ctlmnb; |
99 | extern int msg_ctlmni; |
100 | extern int sem_ctls[]; |
101 | #endif |
102 | |
103 | #ifdef __sparc__ |
104 | extern char reboot_command []; |
105 | extern int stop_a_enabled; |
106 | extern int scons_pwroff; |
107 | #endif |
108 | |
109 | #ifdef __hppa__ |
110 | extern int pwrsw_enabled; |
111 | extern int unaligned_enabled; |
112 | #endif |
113 | |
114 | #ifdef CONFIG_ARCH_S390 |
115 | #ifdef CONFIG_MATHEMU |
116 | extern int sysctl_ieee_emulation_warnings; |
117 | #endif |
118 | extern int sysctl_userprocess_debug; |
119 | #endif |
120 | |
121 | extern int sysctl_hz_timer; |
122 | |
123 | #ifdef CONFIG_BSD_PROCESS_ACCT |
124 | extern int acct_parm[]; |
125 | #endif |
126 | |
127 | int randomize_va_space = 1; |
128 | |
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[]; |
140 | #ifdef CONFIG_NET |
141 | extern ctl_table net_table[]; |
142 | #endif |
143 | static ctl_table proc_table[]; |
144 | static ctl_table fs_table[]; |
145 | static ctl_table debug_table[]; |
146 | static ctl_table dev_table[]; |
147 | extern ctl_table random_table[]; |
148 | #ifdef CONFIG_UNIX98_PTYS |
149 | extern ctl_table pty_table[]; |
150 | #endif |
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 | |
172 | static void register_proc_table(ctl_table *, struct proc_dir_entry *); |
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 | }, |
223 | { .ctl_name = 0 } |
224 | }; |
225 | |
226 | static ctl_table kern_table[] = { |
227 | { |
228 | .ctl_name = KERN_OSTYPE, |
229 | .procname = "ostype", |
230 | .data = system_utsname.sysname, |
231 | .maxlen = sizeof(system_utsname.sysname), |
232 | .mode = 0444, |
233 | .proc_handler = &proc_doutsstring, |
234 | .strategy = &sysctl_string, |
235 | }, |
236 | { |
237 | .ctl_name = KERN_OSRELEASE, |
238 | .procname = "osrelease", |
239 | .data = system_utsname.release, |
240 | .maxlen = sizeof(system_utsname.release), |
241 | .mode = 0444, |
242 | .proc_handler = &proc_doutsstring, |
243 | .strategy = &sysctl_string, |
244 | }, |
245 | { |
246 | .ctl_name = KERN_VERSION, |
247 | .procname = "version", |
248 | .data = system_utsname.version, |
249 | .maxlen = sizeof(system_utsname.version), |
250 | .mode = 0444, |
251 | .proc_handler = &proc_doutsstring, |
252 | .strategy = &sysctl_string, |
253 | }, |
254 | { |
255 | .ctl_name = KERN_NODENAME, |
256 | .procname = "hostname", |
257 | .data = system_utsname.nodename, |
258 | .maxlen = sizeof(system_utsname.nodename), |
259 | .mode = 0644, |
260 | .proc_handler = &proc_doutsstring, |
261 | .strategy = &sysctl_string, |
262 | }, |
263 | { |
264 | .ctl_name = KERN_DOMAINNAME, |
265 | .procname = "domainname", |
266 | .data = system_utsname.domainname, |
267 | .maxlen = sizeof(system_utsname.domainname), |
268 | .mode = 0644, |
269 | .proc_handler = &proc_doutsstring, |
270 | .strategy = &sysctl_string, |
271 | }, |
272 | { |
273 | .ctl_name = KERN_PANIC, |
274 | .procname = "panic", |
275 | .data = &panic_timeout, |
276 | .maxlen = sizeof(int), |
277 | .mode = 0644, |
278 | .proc_handler = &proc_dointvec, |
279 | }, |
280 | { |
281 | .ctl_name = KERN_CORE_USES_PID, |
282 | .procname = "core_uses_pid", |
283 | .data = &core_uses_pid, |
284 | .maxlen = sizeof(int), |
285 | .mode = 0644, |
286 | .proc_handler = &proc_dointvec, |
287 | }, |
288 | { |
289 | .ctl_name = KERN_CORE_PATTERN, |
290 | .procname = "core_pattern", |
291 | .data = core_pattern, |
292 | .maxlen = 64, |
293 | .mode = 0644, |
294 | .proc_handler = &proc_dostring, |
295 | .strategy = &sysctl_string, |
296 | }, |
297 | { |
298 | .ctl_name = KERN_TAINTED, |
299 | .procname = "tainted", |
300 | .data = &tainted, |
301 | .maxlen = sizeof(int), |
302 | .mode = 0444, |
303 | .proc_handler = &proc_dointvec, |
304 | }, |
305 | { |
306 | .ctl_name = KERN_CAP_BSET, |
307 | .procname = "cap-bound", |
308 | .data = &cap_bset, |
309 | .maxlen = sizeof(kernel_cap_t), |
310 | .mode = 0600, |
311 | .proc_handler = &proc_dointvec_bset, |
312 | }, |
313 | #ifdef CONFIG_BLK_DEV_INITRD |
314 | { |
315 | .ctl_name = KERN_REALROOTDEV, |
316 | .procname = "real-root-dev", |
317 | .data = &real_root_dev, |
318 | .maxlen = sizeof(int), |
319 | .mode = 0644, |
320 | .proc_handler = &proc_dointvec, |
321 | }, |
322 | #endif |
323 | #ifdef __sparc__ |
324 | { |
325 | .ctl_name = KERN_SPARC_REBOOT, |
326 | .procname = "reboot-cmd", |
327 | .data = reboot_command, |
328 | .maxlen = 256, |
329 | .mode = 0644, |
330 | .proc_handler = &proc_dostring, |
331 | .strategy = &sysctl_string, |
332 | }, |
333 | { |
334 | .ctl_name = KERN_SPARC_STOP_A, |
335 | .procname = "stop-a", |
336 | .data = &stop_a_enabled, |
337 | .maxlen = sizeof (int), |
338 | .mode = 0644, |
339 | .proc_handler = &proc_dointvec, |
340 | }, |
341 | { |
342 | .ctl_name = KERN_SPARC_SCONS_PWROFF, |
343 | .procname = "scons-poweroff", |
344 | .data = &scons_pwroff, |
345 | .maxlen = sizeof (int), |
346 | .mode = 0644, |
347 | .proc_handler = &proc_dointvec, |
348 | }, |
349 | #endif |
350 | #ifdef __hppa__ |
351 | { |
352 | .ctl_name = KERN_HPPA_PWRSW, |
353 | .procname = "soft-power", |
354 | .data = &pwrsw_enabled, |
355 | .maxlen = sizeof (int), |
356 | .mode = 0644, |
357 | .proc_handler = &proc_dointvec, |
358 | }, |
359 | { |
360 | .ctl_name = KERN_HPPA_UNALIGNED, |
361 | .procname = "unaligned-trap", |
362 | .data = &unaligned_enabled, |
363 | .maxlen = sizeof (int), |
364 | .mode = 0644, |
365 | .proc_handler = &proc_dointvec, |
366 | }, |
367 | #endif |
368 | { |
369 | .ctl_name = KERN_CTLALTDEL, |
370 | .procname = "ctrl-alt-del", |
371 | .data = &C_A_D, |
372 | .maxlen = sizeof(int), |
373 | .mode = 0644, |
374 | .proc_handler = &proc_dointvec, |
375 | }, |
376 | { |
377 | .ctl_name = KERN_PRINTK, |
378 | .procname = "printk", |
379 | .data = &console_loglevel, |
380 | .maxlen = 4*sizeof(int), |
381 | .mode = 0644, |
382 | .proc_handler = &proc_dointvec, |
383 | }, |
384 | #ifdef CONFIG_KMOD |
385 | { |
386 | .ctl_name = KERN_MODPROBE, |
387 | .procname = "modprobe", |
388 | .data = &modprobe_path, |
389 | .maxlen = KMOD_PATH_LEN, |
390 | .mode = 0644, |
391 | .proc_handler = &proc_dostring, |
392 | .strategy = &sysctl_string, |
393 | }, |
394 | #endif |
395 | #ifdef CONFIG_HOTPLUG |
396 | { |
397 | .ctl_name = KERN_HOTPLUG, |
398 | .procname = "hotplug", |
399 | .data = &hotplug_path, |
400 | .maxlen = HOTPLUG_PATH_LEN, |
401 | .mode = 0644, |
402 | .proc_handler = &proc_dostring, |
403 | .strategy = &sysctl_string, |
404 | }, |
405 | #endif |
406 | #ifdef CONFIG_FB_SPLASH |
407 | { |
408 | .ctl_name = KERN_FBSPLASH, |
409 | .procname = "fbsplash", |
410 | .data = &fbsplash_path, |
411 | .maxlen = KMOD_PATH_LEN, |
412 | .mode = 0644, |
413 | .proc_handler = &proc_dostring, |
414 | .strategy = &sysctl_string, |
415 | }, |
416 | #endif |
417 | #ifdef CONFIG_CHR_DEV_SG |
418 | { |
419 | .ctl_name = KERN_SG_BIG_BUFF, |
420 | .procname = "sg-big-buff", |
421 | .data = &sg_big_buff, |
422 | .maxlen = sizeof (int), |
423 | .mode = 0444, |
424 | .proc_handler = &proc_dointvec, |
425 | }, |
426 | #endif |
427 | #ifdef CONFIG_BSD_PROCESS_ACCT |
428 | { |
429 | .ctl_name = KERN_ACCT, |
430 | .procname = "acct", |
431 | .data = &acct_parm, |
432 | .maxlen = 3*sizeof(int), |
433 | .mode = 0644, |
434 | .proc_handler = &proc_dointvec, |
435 | }, |
436 | #endif |
437 | #ifdef CONFIG_SYSVIPC |
438 | { |
439 | .ctl_name = KERN_SHMMAX, |
440 | .procname = "shmmax", |
441 | .data = &shm_ctlmax, |
442 | .maxlen = sizeof (size_t), |
443 | .mode = 0644, |
444 | .proc_handler = &proc_doulongvec_minmax, |
445 | }, |
446 | { |
447 | .ctl_name = KERN_SHMALL, |
448 | .procname = "shmall", |
449 | .data = &shm_ctlall, |
450 | .maxlen = sizeof (size_t), |
451 | .mode = 0644, |
452 | .proc_handler = &proc_doulongvec_minmax, |
453 | }, |
454 | { |
455 | .ctl_name = KERN_SHMMNI, |
456 | .procname = "shmmni", |
457 | .data = &shm_ctlmni, |
458 | .maxlen = sizeof (int), |
459 | .mode = 0644, |
460 | .proc_handler = &proc_dointvec, |
461 | }, |
462 | { |
463 | .ctl_name = KERN_MSGMAX, |
464 | .procname = "msgmax", |
465 | .data = &msg_ctlmax, |
466 | .maxlen = sizeof (int), |
467 | .mode = 0644, |
468 | .proc_handler = &proc_dointvec, |
469 | }, |
470 | { |
471 | .ctl_name = KERN_MSGMNI, |
472 | .procname = "msgmni", |
473 | .data = &msg_ctlmni, |
474 | .maxlen = sizeof (int), |
475 | .mode = 0644, |
476 | .proc_handler = &proc_dointvec, |
477 | }, |
478 | { |
479 | .ctl_name = KERN_MSGMNB, |
480 | .procname = "msgmnb", |
481 | .data = &msg_ctlmnb, |
482 | .maxlen = sizeof (int), |
483 | .mode = 0644, |
484 | .proc_handler = &proc_dointvec, |
485 | }, |
486 | { |
487 | .ctl_name = KERN_SEM, |
488 | .procname = "sem", |
489 | .data = &sem_ctls, |
490 | .maxlen = 4*sizeof (int), |
491 | .mode = 0644, |
492 | .proc_handler = &proc_dointvec, |
493 | }, |
494 | #endif |
495 | #ifdef CONFIG_MAGIC_SYSRQ |
496 | { |
497 | .ctl_name = KERN_SYSRQ, |
498 | .procname = "sysrq", |
499 | .data = &sysrq_enabled, |
500 | .maxlen = sizeof (int), |
501 | .mode = 0644, |
502 | .proc_handler = &proc_dointvec, |
503 | }, |
504 | #endif |
505 | { |
506 | .ctl_name = KERN_CADPID, |
507 | .procname = "cad_pid", |
508 | .data = &cad_pid, |
509 | .maxlen = sizeof (int), |
510 | .mode = 0600, |
511 | .proc_handler = &proc_dointvec, |
512 | }, |
513 | { |
514 | .ctl_name = KERN_MAX_THREADS, |
515 | .procname = "threads-max", |
516 | .data = &max_threads, |
517 | .maxlen = sizeof(int), |
518 | .mode = 0644, |
519 | .proc_handler = &proc_dointvec, |
520 | }, |
521 | { |
522 | .ctl_name = KERN_RANDOM, |
523 | .procname = "random", |
524 | .mode = 0555, |
525 | .child = random_table, |
526 | }, |
527 | #ifdef CONFIG_UNIX98_PTYS |
528 | { |
529 | .ctl_name = KERN_PTY, |
530 | .procname = "pty", |
531 | .mode = 0555, |
532 | .child = pty_table, |
533 | }, |
534 | #endif |
535 | { |
536 | .ctl_name = KERN_OVERFLOWUID, |
537 | .procname = "overflowuid", |
538 | .data = &overflowuid, |
539 | .maxlen = sizeof(int), |
540 | .mode = 0644, |
541 | .proc_handler = &proc_dointvec_minmax, |
542 | .strategy = &sysctl_intvec, |
543 | .extra1 = &minolduid, |
544 | .extra2 = &maxolduid, |
545 | }, |
546 | { |
547 | .ctl_name = KERN_OVERFLOWGID, |
548 | .procname = "overflowgid", |
549 | .data = &overflowgid, |
550 | .maxlen = sizeof(int), |
551 | .mode = 0644, |
552 | .proc_handler = &proc_dointvec_minmax, |
553 | .strategy = &sysctl_intvec, |
554 | .extra1 = &minolduid, |
555 | .extra2 = &maxolduid, |
556 | }, |
557 | #ifdef CONFIG_ARCH_S390 |
558 | #ifdef CONFIG_MATHEMU |
559 | { |
560 | .ctl_name = KERN_IEEE_EMULATION_WARNINGS, |
561 | .procname = "ieee_emulation_warnings", |
562 | .data = &sysctl_ieee_emulation_warnings, |
563 | .maxlen = sizeof(int), |
564 | .mode = 0644, |
565 | .proc_handler = &proc_dointvec, |
566 | }, |
567 | #endif |
568 | #ifdef CONFIG_NO_IDLE_HZ |
569 | { |
570 | .ctl_name = KERN_HZ_TIMER, |
571 | .procname = "hz_timer", |
572 | .data = &sysctl_hz_timer, |
573 | .maxlen = sizeof(int), |
574 | .mode = 0644, |
575 | .proc_handler = &proc_dointvec, |
576 | }, |
577 | #endif |
578 | { |
579 | .ctl_name = KERN_S390_USER_DEBUG_LOGGING, |
580 | .procname = "userprocess_debug", |
581 | .data = &sysctl_userprocess_debug, |
582 | .maxlen = sizeof(int), |
583 | .mode = 0644, |
584 | .proc_handler = &proc_dointvec, |
585 | }, |
586 | #endif |
587 | { |
588 | .ctl_name = KERN_PIDMAX, |
589 | .procname = "pid_max", |
590 | .data = &pid_max, |
591 | .maxlen = sizeof (int), |
592 | .mode = 0644, |
593 | .proc_handler = &proc_dointvec_minmax, |
594 | .strategy = sysctl_intvec, |
595 | .extra1 = &pid_max_min, |
596 | .extra2 = &pid_max_max, |
597 | }, |
598 | { |
599 | .ctl_name = KERN_PANIC_ON_OOPS, |
600 | .procname = "panic_on_oops", |
601 | .data = &panic_on_oops, |
602 | .maxlen = sizeof(int), |
603 | .mode = 0644, |
604 | .proc_handler = &proc_dointvec, |
605 | }, |
606 | { |
607 | .ctl_name = KERN_PRINTK_RATELIMIT, |
608 | .procname = "printk_ratelimit", |
609 | .data = &printk_ratelimit_jiffies, |
610 | .maxlen = sizeof(int), |
611 | .mode = 0644, |
612 | .proc_handler = &proc_dointvec_jiffies, |
613 | .strategy = &sysctl_jiffies, |
614 | }, |
615 | { |
616 | .ctl_name = KERN_PRINTK_RATELIMIT_BURST, |
617 | .procname = "printk_ratelimit_burst", |
618 | .data = &printk_ratelimit_burst, |
619 | .maxlen = sizeof(int), |
620 | .mode = 0644, |
621 | .proc_handler = &proc_dointvec, |
622 | }, |
623 | { |
624 | .ctl_name = KERN_NGROUPS_MAX, |
625 | .procname = "ngroups_max", |
626 | .data = &ngroups_max, |
627 | .maxlen = sizeof (int), |
628 | .mode = 0444, |
629 | .proc_handler = &proc_dointvec, |
630 | }, |
631 | { |
632 | .ctl_name = KERN_INTERACTIVE, |
633 | .procname = "interactive", |
634 | .data = &sched_interactive, |
635 | .maxlen = sizeof (int), |
636 | .mode = 0644, |
637 | .proc_handler = &proc_dointvec, |
638 | }, |
639 | { |
640 | .ctl_name = KERN_COMPUTE, |
641 | .procname = "compute", |
642 | .data = &sched_compute, |
643 | .maxlen = sizeof (int), |
644 | .mode = 0644, |
645 | .proc_handler = &proc_dointvec, |
646 | }, |
647 | #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86) |
648 | { |
649 | .ctl_name = KERN_UNKNOWN_NMI_PANIC, |
650 | .procname = "unknown_nmi_panic", |
651 | .data = &unknown_nmi_panic, |
652 | .maxlen = sizeof (int), |
653 | .mode = 0644, |
654 | .proc_handler = &proc_unknown_nmi_panic, |
655 | }, |
656 | #endif |
657 | #if defined(CONFIG_X86) |
658 | { |
659 | .ctl_name = KERN_BOOTLOADER_TYPE, |
660 | .procname = "bootloader_type", |
661 | .data = &bootloader_type, |
662 | .maxlen = sizeof (int), |
663 | .mode = 0444, |
664 | .proc_handler = &proc_dointvec, |
665 | }, |
666 | #endif |
667 | { |
668 | .ctl_name = KERN_RANDOMIZE, |
669 | .procname = "randomize_va_space", |
670 | .data = &randomize_va_space, |
671 | .maxlen = sizeof(int), |
672 | .mode = 0644, |
673 | .proc_handler = &proc_dointvec, |
674 | }, |
675 | |
676 | { .ctl_name = 0 } |
677 | }; |
678 | |
679 | /* Constants for minimum and maximum testing in vm_table. |
680 | We use these as one-element integer vectors. */ |
681 | static int zero; |
682 | static int one_hundred = 100; |
683 | |
684 | |
685 | static ctl_table vm_table[] = { |
686 | { |
687 | .ctl_name = VM_OVERCOMMIT_MEMORY, |
688 | .procname = "overcommit_memory", |
689 | .data = &sysctl_overcommit_memory, |
690 | .maxlen = sizeof(sysctl_overcommit_memory), |
691 | .mode = 0644, |
692 | .proc_handler = &proc_dointvec, |
693 | }, |
694 | { |
695 | .ctl_name = VM_OVERCOMMIT_RATIO, |
696 | .procname = "overcommit_ratio", |
697 | .data = &sysctl_overcommit_ratio, |
698 | .maxlen = sizeof(sysctl_overcommit_ratio), |
699 | .mode = 0644, |
700 | .proc_handler = &proc_dointvec, |
701 | }, |
702 | { |
703 | .ctl_name = VM_PAGE_CLUSTER, |
704 | .procname = "page-cluster", |
705 | .data = &page_cluster, |
706 | .maxlen = sizeof(int), |
707 | .mode = 0644, |
708 | .proc_handler = &proc_dointvec, |
709 | }, |
710 | { |
711 | .ctl_name = VM_DIRTY_BACKGROUND, |
712 | .procname = "dirty_background_ratio", |
713 | .data = &dirty_background_ratio, |
714 | .maxlen = sizeof(dirty_background_ratio), |
715 | .mode = 0644, |
716 | .proc_handler = &proc_dointvec_minmax, |
717 | .strategy = &sysctl_intvec, |
718 | .extra1 = &zero, |
719 | .extra2 = &one_hundred, |
720 | }, |
721 | { |
722 | .ctl_name = VM_DIRTY_RATIO, |
723 | .procname = "dirty_ratio", |
724 | .data = &vm_dirty_ratio, |
725 | .maxlen = sizeof(vm_dirty_ratio), |
726 | .mode = 0644, |
727 | .proc_handler = &proc_dointvec_minmax, |
728 | .strategy = &sysctl_intvec, |
729 | .extra1 = &zero, |
730 | .extra2 = &one_hundred, |
731 | }, |
732 | { |
733 | .ctl_name = VM_DIRTY_WB_CS, |
734 | .procname = "dirty_writeback_centisecs", |
735 | .data = &dirty_writeback_centisecs, |
736 | .maxlen = sizeof(dirty_writeback_centisecs), |
737 | .mode = 0644, |
738 | .proc_handler = &dirty_writeback_centisecs_handler, |
739 | }, |
740 | { |
741 | .ctl_name = VM_DIRTY_EXPIRE_CS, |
742 | .procname = "dirty_expire_centisecs", |
743 | .data = &dirty_expire_centisecs, |
744 | .maxlen = sizeof(dirty_expire_centisecs), |
745 | .mode = 0644, |
746 | .proc_handler = &proc_dointvec, |
747 | }, |
748 | { |
749 | .ctl_name = VM_NR_PDFLUSH_THREADS, |
750 | .procname = "nr_pdflush_threads", |
751 | .data = &nr_pdflush_threads, |
752 | .maxlen = sizeof nr_pdflush_threads, |
753 | .mode = 0444 /* read-only*/, |
754 | .proc_handler = &proc_dointvec, |
755 | }, |
756 | { |
757 | .ctl_name = VM_MAPPED, |
758 | .procname = "mapped", |
759 | .data = &vm_mapped, |
760 | .maxlen = sizeof(vm_mapped), |
761 | .mode = 0644, |
762 | .proc_handler = &proc_dointvec_minmax, |
763 | .strategy = &sysctl_intvec, |
764 | .extra1 = &zero, |
765 | .extra2 = &one_hundred, |
766 | }, |
767 | { |
768 | .ctl_name = VM_HARDMAPLIMIT, |
769 | .procname = "hardmaplimit", |
770 | .data = &vm_hardmaplimit, |
771 | .maxlen = sizeof(int), |
772 | .mode = 0644, |
773 | .proc_handler = &proc_dointvec, |
774 | }, |
775 | #ifdef CONFIG_HUGETLB_PAGE |
776 | { |
777 | .ctl_name = VM_HUGETLB_PAGES, |
778 | .procname = "nr_hugepages", |
779 | .data = &max_huge_pages, |
780 | .maxlen = sizeof(unsigned long), |
781 | .mode = 0644, |
782 | .proc_handler = &hugetlb_sysctl_handler, |
783 | .extra1 = (void *)&hugetlb_zero, |
784 | .extra2 = (void *)&hugetlb_infinity, |
785 | }, |
786 | { |
787 | .ctl_name = VM_HUGETLB_GROUP, |
788 | .procname = "hugetlb_shm_group", |
789 | .data = &sysctl_hugetlb_shm_group, |
790 | .maxlen = sizeof(gid_t), |
791 | .mode = 0644, |
792 | .proc_handler = &proc_dointvec, |
793 | }, |
794 | #endif |
795 | { |
796 | .ctl_name = VM_LOWMEM_RESERVE_RATIO, |
797 | .procname = "lowmem_reserve_ratio", |
798 | .data = &sysctl_lowmem_reserve_ratio, |
799 | .maxlen = sizeof(sysctl_lowmem_reserve_ratio), |
800 | .mode = 0644, |
801 | .proc_handler = &lowmem_reserve_ratio_sysctl_handler, |
802 | .strategy = &sysctl_intvec, |
803 | }, |
804 | { |
805 | .ctl_name = VM_MIN_FREE_KBYTES, |
806 | .procname = "min_free_kbytes", |
807 | .data = &min_free_kbytes, |
808 | .maxlen = sizeof(min_free_kbytes), |
809 | .mode = 0644, |
810 | .proc_handler = &min_free_kbytes_sysctl_handler, |
811 | .strategy = &sysctl_intvec, |
812 | .extra1 = &zero, |
813 | }, |
814 | #ifdef CONFIG_MMU |
815 | { |
816 | .ctl_name = VM_MAX_MAP_COUNT, |
817 | .procname = "max_map_count", |
818 | .data = &sysctl_max_map_count, |
819 | .maxlen = sizeof(sysctl_max_map_count), |
820 | .mode = 0644, |
821 | .proc_handler = &proc_dointvec |
822 | }, |
823 | #endif |
824 | { |
825 | .ctl_name = VM_LAPTOP_MODE, |
826 | .procname = "laptop_mode", |
827 | .data = &laptop_mode, |
828 | .maxlen = sizeof(laptop_mode), |
829 | .mode = 0644, |
830 | .proc_handler = &proc_dointvec, |
831 | .strategy = &sysctl_intvec, |
832 | .extra1 = &zero, |
833 | }, |
834 | { |
835 | .ctl_name = VM_BLOCK_DUMP, |
836 | .procname = "block_dump", |
837 | .data = &block_dump, |
838 | .maxlen = sizeof(block_dump), |
839 | .mode = 0644, |
840 | .proc_handler = &proc_dointvec, |
841 | .strategy = &sysctl_intvec, |
842 | .extra1 = &zero, |
843 | }, |
844 | { |
845 | .ctl_name = VM_VFS_CACHE_PRESSURE, |
846 | .procname = "vfs_cache_pressure", |
847 | .data = &sysctl_vfs_cache_pressure, |
848 | .maxlen = sizeof(sysctl_vfs_cache_pressure), |
849 | .mode = 0644, |
850 | .proc_handler = &proc_dointvec, |
851 | .strategy = &sysctl_intvec, |
852 | .extra1 = &zero, |
853 | }, |
854 | #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT |
855 | { |
856 | .ctl_name = VM_LEGACY_VA_LAYOUT, |
857 | .procname = "legacy_va_layout", |
858 | .data = &sysctl_legacy_va_layout, |
859 | .maxlen = sizeof(sysctl_legacy_va_layout), |
860 | .mode = 0644, |
861 | .proc_handler = &proc_dointvec, |
862 | .strategy = &sysctl_intvec, |
863 | .extra1 = &zero, |
864 | }, |
865 | #endif |
866 | #ifdef CONFIG_SWAP |
867 | { |
868 | .ctl_name = VM_SWAP_TOKEN_TIMEOUT, |
869 | .procname = "swap_token_timeout", |
870 | .data = &swap_token_default_timeout, |
871 | .maxlen = sizeof(swap_token_default_timeout), |
872 | .mode = 0644, |
873 | .proc_handler = &proc_dointvec_jiffies, |
874 | .strategy = &sysctl_jiffies, |
875 | }, |
876 | #endif |
877 | { .ctl_name = 0 } |
878 | }; |
879 | |
880 | static ctl_table proc_table[] = { |
881 | { .ctl_name = 0 } |
882 | }; |
883 | |
884 | static ctl_table fs_table[] = { |
885 | { |
886 | .ctl_name = FS_NRINODE, |
887 | .procname = "inode-nr", |
888 | .data = &inodes_stat, |
889 | .maxlen = 2*sizeof(int), |
890 | .mode = 0444, |
891 | .proc_handler = &proc_dointvec, |
892 | }, |
893 | { |
894 | .ctl_name = FS_STATINODE, |
895 | .procname = "inode-state", |
896 | .data = &inodes_stat, |
897 | .maxlen = 7*sizeof(int), |
898 | .mode = 0444, |
899 | .proc_handler = &proc_dointvec, |
900 | }, |
901 | { |
902 | .ctl_name = FS_NRFILE, |
903 | .procname = "file-nr", |
904 | .data = &files_stat, |
905 | .maxlen = 3*sizeof(int), |
906 | .mode = 0444, |
907 | .proc_handler = &proc_dointvec, |
908 | }, |
909 | { |
910 | .ctl_name = FS_MAXFILE, |
911 | .procname = "file-max", |
912 | .data = &files_stat.max_files, |
913 | .maxlen = sizeof(int), |
914 | .mode = 0644, |
915 | .proc_handler = &proc_dointvec, |
916 | }, |
917 | { |
918 | .ctl_name = FS_DENTRY, |
919 | .procname = "dentry-state", |
920 | .data = &dentry_stat, |
921 | .maxlen = 6*sizeof(int), |
922 | .mode = 0444, |
923 | .proc_handler = &proc_dointvec, |
924 | }, |
925 | { |
926 | .ctl_name = FS_OVERFLOWUID, |
927 | .procname = "overflowuid", |
928 | .data = &fs_overflowuid, |
929 | .maxlen = sizeof(int), |
930 | .mode = 0644, |
931 | .proc_handler = &proc_dointvec_minmax, |
932 | .strategy = &sysctl_intvec, |
933 | .extra1 = &minolduid, |
934 | .extra2 = &maxolduid, |
935 | }, |
936 | { |
937 | .ctl_name = FS_OVERFLOWGID, |
938 | .procname = "overflowgid", |
939 | .data = &fs_overflowgid, |
940 | .maxlen = sizeof(int), |
941 | .mode = 0644, |
942 | .proc_handler = &proc_dointvec_minmax, |
943 | .strategy = &sysctl_intvec, |
944 | .extra1 = &minolduid, |
945 | .extra2 = &maxolduid, |
946 | }, |
947 | { |
948 | .ctl_name = FS_LEASES, |
949 | .procname = "leases-enable", |
950 | .data = &leases_enable, |
951 | .maxlen = sizeof(int), |
952 | .mode = 0644, |
953 | .proc_handler = &proc_dointvec, |
954 | }, |
955 | #ifdef CONFIG_DNOTIFY |
956 | { |
957 | .ctl_name = FS_DIR_NOTIFY, |
958 | .procname = "dir-notify-enable", |
959 | .data = &dir_notify_enable, |
960 | .maxlen = sizeof(int), |
961 | .mode = 0644, |
962 | .proc_handler = &proc_dointvec, |
963 | }, |
964 | #endif |
965 | #ifdef CONFIG_MMU |
966 | { |
967 | .ctl_name = FS_LEASE_TIME, |
968 | .procname = "lease-break-time", |
969 | .data = &lease_break_time, |
970 | .maxlen = sizeof(int), |
971 | .mode = 0644, |
972 | .proc_handler = &proc_dointvec, |
973 | }, |
974 | { |
975 | .ctl_name = FS_AIO_NR, |
976 | .procname = "aio-nr", |
977 | .data = &aio_nr, |
978 | .maxlen = sizeof(aio_nr), |
979 | .mode = 0444, |
980 | .proc_handler = &proc_dointvec, |
981 | }, |
982 | { |
983 | .ctl_name = FS_AIO_MAX_NR, |
984 | .procname = "aio-max-nr", |
985 | .data = &aio_max_nr, |
986 | .maxlen = sizeof(aio_max_nr), |
987 | .mode = 0644, |
988 | .proc_handler = &proc_dointvec, |
989 | }, |
990 | #endif |
991 | { .ctl_name = 0 } |
992 | }; |
993 | |
994 | static ctl_table debug_table[] = { |
995 | { .ctl_name = 0 } |
996 | }; |
997 | |
998 | static ctl_table dev_table[] = { |
999 | { .ctl_name = 0 } |
1000 | }; |
1001 | |
1002 | extern void init_irq_proc (void); |
1003 | |
1004 | void __init sysctl_init(void) |
1005 | { |
1006 | #ifdef CONFIG_PROC_FS |
1007 | register_proc_table(root_table, proc_sys_root); |
1008 | init_irq_proc(); |
1009 | #endif |
1010 | } |
1011 | |
1012 | int do_sysctl(int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp, |
1013 | void __user *newval, size_t newlen) |
1014 | { |
1015 | struct list_head *tmp; |
1016 | |
1017 | if (nlen <= 0 || nlen >= CTL_MAXNAME) |
1018 | return -ENOTDIR; |
1019 | if (oldval) { |
1020 | int old_len; |
1021 | if (!oldlenp || get_user(old_len, oldlenp)) |
1022 | return -EFAULT; |
1023 | } |
1024 | tmp = &root_table_header.ctl_entry; |
1025 | do { |
1026 | struct ctl_table_header *head = |
1027 | list_entry(tmp, struct ctl_table_header, ctl_entry); |
1028 | void *context = NULL; |
1029 | int error = parse_table(name, nlen, oldval, oldlenp, |
1030 | newval, newlen, head->ctl_table, |
1031 | &context); |
1032 | if (context) |
1033 | kfree(context); |
1034 | if (error != -ENOTDIR) |
1035 | return error; |
1036 | tmp = tmp->next; |
1037 | } while (tmp != &root_table_header.ctl_entry); |
1038 | return -ENOTDIR; |
1039 | } |
1040 | |
1041 | asmlinkage long sys_sysctl(struct __sysctl_args __user *args) |
1042 | { |
1043 | struct __sysctl_args tmp; |
1044 | int error; |
1045 | |
1046 | if (copy_from_user(&tmp, args, sizeof(tmp))) |
1047 | return -EFAULT; |
1048 | |
1049 | lock_kernel(); |
1050 | error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp, |
1051 | tmp.newval, tmp.newlen); |
1052 | unlock_kernel(); |
1053 | return error; |
1054 | } |
1055 | |
1056 | /* |
1057 | * ctl_perm does NOT grant the superuser all rights automatically, because |
1058 | * some sysctl variables are readonly even to root. |
1059 | */ |
1060 | |
1061 | static int test_perm(int mode, int op) |
1062 | { |
1063 | if (!current->euid) |
1064 | mode >>= 6; |
1065 | else if (in_egroup_p(0)) |
1066 | mode >>= 3; |
1067 | if ((mode & op & 0007) == op) |
1068 | return 0; |
1069 | return -EACCES; |
1070 | } |
1071 | |
1072 | static inline int ctl_perm(ctl_table *table, int op) |
1073 | { |
1074 | int error; |
1075 | error = security_sysctl(table, op); |
1076 | if (error) |
1077 | return error; |
1078 | return test_perm(table->mode, op); |
1079 | } |
1080 | |
1081 | static int parse_table(int __user *name, int nlen, |
1082 | void __user *oldval, size_t __user *oldlenp, |
1083 | void __user *newval, size_t newlen, |
1084 | ctl_table *table, void **context) |
1085 | { |
1086 | int n; |
1087 | repeat: |
1088 | if (!nlen) |
1089 | return -ENOTDIR; |
1090 | if (get_user(n, name)) |
1091 | return -EFAULT; |
1092 | for ( ; table->ctl_name; table++) { |
1093 | if (n == table->ctl_name || table->ctl_name == CTL_ANY) { |
1094 | int error; |
1095 | if (table->child) { |
1096 | if (ctl_perm(table, 001)) |
1097 | return -EPERM; |
1098 | if (table->strategy) { |
1099 | error = table->strategy( |
1100 | table, name, nlen, |
1101 | oldval, oldlenp, |
1102 | newval, newlen, context); |
1103 | if (error) |
1104 | return error; |
1105 | } |
1106 | name++; |
1107 | nlen--; |
1108 | table = table->child; |
1109 | goto repeat; |
1110 | } |
1111 | error = do_sysctl_strategy(table, name, nlen, |
1112 | oldval, oldlenp, |
1113 | newval, newlen, context); |
1114 | return error; |
1115 | } |
1116 | } |
1117 | return -ENOTDIR; |
1118 | } |
1119 | |
1120 | /* Perform the actual read/write of a sysctl table entry. */ |
1121 | int do_sysctl_strategy (ctl_table *table, |
1122 | int __user *name, int nlen, |
1123 | void __user *oldval, size_t __user *oldlenp, |
1124 | void __user *newval, size_t newlen, void **context) |
1125 | { |
1126 | int op = 0, rc; |
1127 | size_t len; |
1128 | |
1129 | if (oldval) |
1130 | op |= 004; |
1131 | if (newval) |
1132 | op |= 002; |
1133 | if (ctl_perm(table, op)) |
1134 | return -EPERM; |
1135 | |
1136 | if (table->strategy) { |
1137 | rc = table->strategy(table, name, nlen, oldval, oldlenp, |
1138 | newval, newlen, context); |
1139 | if (rc < 0) |
1140 | return rc; |
1141 | if (rc > 0) |
1142 | return 0; |
1143 | } |
1144 | |
1145 | /* If there is no strategy routine, or if the strategy returns |
1146 | * zero, proceed with automatic r/w */ |
1147 | if (table->data && table->maxlen) { |
1148 | if (oldval && oldlenp) { |
1149 | if (get_user(len, oldlenp)) |
1150 | return -EFAULT; |
1151 | if (len) { |
1152 | if (len > table->maxlen) |
1153 | len = table->maxlen; |
1154 | if(copy_to_user(oldval, table->data, len)) |
1155 | return -EFAULT; |
1156 | if(put_user(len, oldlenp)) |
1157 | return -EFAULT; |
1158 | } |
1159 | } |
1160 | if (newval && newlen) { |
1161 | len = newlen; |
1162 | if (len > table->maxlen) |
1163 | len = table->maxlen; |
1164 | if(copy_from_user(table->data, newval, len)) |
1165 | return -EFAULT; |
1166 | } |
1167 | } |
1168 | return 0; |
1169 | } |
1170 | |
1171 | /** |
1172 | * register_sysctl_table - register a sysctl hierarchy |
1173 | * @table: the top-level table structure |
1174 | * @insert_at_head: whether the entry should be inserted in front or at the end |
1175 | * |
1176 | * Register a sysctl table hierarchy. @table should be a filled in ctl_table |
1177 | * array. An entry with a ctl_name of 0 terminates the table. |
1178 | * |
1179 | * The members of the &ctl_table structure are used as follows: |
1180 | * |
1181 | * ctl_name - This is the numeric sysctl value used by sysctl(2). The number |
1182 | * must be unique within that level of sysctl |
1183 | * |
1184 | * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not |
1185 | * enter a sysctl file |
1186 | * |
1187 | * data - a pointer to data for use by proc_handler |
1188 | * |
1189 | * maxlen - the maximum size in bytes of the data |
1190 | * |
1191 | * mode - the file permissions for the /proc/sys file, and for sysctl(2) |
1192 | * |
1193 | * child - a pointer to the child sysctl table if this entry is a directory, or |
1194 | * %NULL. |
1195 | * |
1196 | * proc_handler - the text handler routine (described below) |
1197 | * |
1198 | * strategy - the strategy routine (described below) |
1199 | * |
1200 | * de - for internal use by the sysctl routines |
1201 | * |
1202 | * extra1, extra2 - extra pointers usable by the proc handler routines |
1203 | * |
1204 | * Leaf nodes in the sysctl tree will be represented by a single file |
1205 | * under /proc; non-leaf nodes will be represented by directories. |
1206 | * |
1207 | * sysctl(2) can automatically manage read and write requests through |
1208 | * the sysctl table. The data and maxlen fields of the ctl_table |
1209 | * struct enable minimal validation of the values being written to be |
1210 | * performed, and the mode field allows minimal authentication. |
1211 | * |
1212 | * More sophisticated management can be enabled by the provision of a |
1213 | * strategy routine with the table entry. This will be called before |
1214 | * any automatic read or write of the data is performed. |
1215 | * |
1216 | * The strategy routine may return |
1217 | * |
1218 | * < 0 - Error occurred (error is passed to user process) |
1219 | * |
1220 | * 0 - OK - proceed with automatic read or write. |
1221 | * |
1222 | * > 0 - OK - read or write has been done by the strategy routine, so |
1223 | * return immediately. |
1224 | * |
1225 | * There must be a proc_handler routine for any terminal nodes |
1226 | * mirrored under /proc/sys (non-terminals are handled by a built-in |
1227 | * directory handler). Several default handlers are available to |
1228 | * cover common cases - |
1229 | * |
1230 | * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(), |
1231 | * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(), |
1232 | * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax() |
1233 | * |
1234 | * It is the handler's job to read the input buffer from user memory |
1235 | * and process it. The handler should return 0 on success. |
1236 | * |
1237 | * This routine returns %NULL on a failure to register, and a pointer |
1238 | * to the table header on success. |
1239 | */ |
1240 | struct ctl_table_header *register_sysctl_table(ctl_table * table, |
1241 | int insert_at_head) |
1242 | { |
1243 | struct ctl_table_header *tmp; |
1244 | tmp = kmalloc(sizeof(struct ctl_table_header), GFP_KERNEL); |
1245 | if (!tmp) |
1246 | return NULL; |
1247 | tmp->ctl_table = table; |
1248 | INIT_LIST_HEAD(&tmp->ctl_entry); |
1249 | if (insert_at_head) |
1250 | list_add(&tmp->ctl_entry, &root_table_header.ctl_entry); |
1251 | else |
1252 | list_add_tail(&tmp->ctl_entry, &root_table_header.ctl_entry); |
1253 | #ifdef CONFIG_PROC_FS |
1254 | register_proc_table(table, proc_sys_root); |
1255 | #endif |
1256 | return tmp; |
1257 | } |
1258 | |
1259 | /** |
1260 | * unregister_sysctl_table - unregister a sysctl table hierarchy |
1261 | * @header: the header returned from register_sysctl_table |
1262 | * |
1263 | * Unregisters the sysctl table and all children. proc entries may not |
1264 | * actually be removed until they are no longer used by anyone. |
1265 | */ |
1266 | void unregister_sysctl_table(struct ctl_table_header * header) |
1267 | { |
1268 | list_del(&header->ctl_entry); |
1269 | #ifdef CONFIG_PROC_FS |
1270 | unregister_proc_table(header->ctl_table, proc_sys_root); |
1271 | #endif |
1272 | kfree(header); |
1273 | } |
1274 | |
1275 | /* |
1276 | * /proc/sys support |
1277 | */ |
1278 | |
1279 | #ifdef CONFIG_PROC_FS |
1280 | |
1281 | /* Scan the sysctl entries in table and add them all into /proc */ |
1282 | static void register_proc_table(ctl_table * table, struct proc_dir_entry *root) |
1283 | { |
1284 | struct proc_dir_entry *de; |
1285 | int len; |
1286 | mode_t mode; |
1287 | |
1288 | for (; table->ctl_name; table++) { |
1289 | /* Can't do anything without a proc name. */ |
1290 | if (!table->procname) |
1291 | continue; |
1292 | /* Maybe we can't do anything with it... */ |
1293 | if (!table->proc_handler && !table->child) { |
1294 | printk(KERN_WARNING "SYSCTL: Can't register %s\n", |
1295 | table->procname); |
1296 | continue; |
1297 | } |
1298 | |
1299 | len = strlen(table->procname); |
1300 | mode = table->mode; |
1301 | |
1302 | de = NULL; |
1303 | if (table->proc_handler) |
1304 | mode |= S_IFREG; |
1305 | else { |
1306 | mode |= S_IFDIR; |
1307 | for (de = root->subdir; de; de = de->next) { |
1308 | if (proc_match(len, table->procname, de)) |
1309 | break; |
1310 | } |
1311 | /* If the subdir exists already, de is non-NULL */ |
1312 | } |
1313 | |
1314 | if (!de) { |
1315 | de = create_proc_entry(table->procname, mode, root); |
1316 | if (!de) |
1317 | continue; |
1318 | de->data = (void *) table; |
1319 | if (table->proc_handler) |
1320 | de->proc_fops = &proc_sys_file_operations; |
1321 | } |
1322 | table->de = de; |
1323 | if (de->mode & S_IFDIR) |
1324 | register_proc_table(table->child, de); |
1325 | } |
1326 | } |
1327 | |
1328 | /* |
1329 | * Unregister a /proc sysctl table and any subdirectories. |
1330 | */ |
1331 | static void unregister_proc_table(ctl_table * table, struct proc_dir_entry *root) |
1332 | { |
1333 | struct proc_dir_entry *de; |
1334 | for (; table->ctl_name; table++) { |
1335 | if (!(de = table->de)) |
1336 | continue; |
1337 | if (de->mode & S_IFDIR) { |
1338 | if (!table->child) { |
1339 | printk (KERN_ALERT "Help - malformed sysctl tree on free\n"); |
1340 | continue; |
1341 | } |
1342 | unregister_proc_table(table->child, de); |
1343 | |
1344 | /* Don't unregister directories which still have entries.. */ |
1345 | if (de->subdir) |
1346 | continue; |
1347 | } |
1348 | |
1349 | /* Don't unregister proc entries that are still being used.. */ |
1350 | if (atomic_read(&de->count)) |
1351 | continue; |
1352 | |
1353 | table->de = NULL; |
1354 | remove_proc_entry(table->procname, root); |
1355 | } |
1356 | } |
1357 | |
1358 | static ssize_t do_rw_proc(int write, struct file * file, char __user * buf, |
1359 | size_t count, loff_t *ppos) |
1360 | { |
1361 | int op; |
1362 | struct proc_dir_entry *de; |
1363 | struct ctl_table *table; |
1364 | size_t res; |
1365 | ssize_t error; |
1366 | |
1367 | de = PDE(file->f_dentry->d_inode); |
1368 | if (!de || !de->data) |
1369 | return -ENOTDIR; |
1370 | table = (struct ctl_table *) de->data; |
1371 | if (!table || !table->proc_handler) |
1372 | return -ENOTDIR; |
1373 | op = (write ? 002 : 004); |
1374 | if (ctl_perm(table, op)) |
1375 | return -EPERM; |
1376 | |
1377 | res = count; |
1378 | |
1379 | error = (*table->proc_handler) (table, write, file, buf, &res, ppos); |
1380 | if (error) |
1381 | return error; |
1382 | return res; |
1383 | } |
1384 | |
1385 | static int proc_opensys(struct inode *inode, struct file *file) |
1386 | { |
1387 | if (file->f_mode & FMODE_WRITE) { |
1388 | /* |
1389 | * sysctl entries that are not writable, |
1390 | * are _NOT_ writable, capabilities or not. |
1391 | */ |
1392 | if (!(inode->i_mode & S_IWUSR)) |
1393 | return -EPERM; |
1394 | } |
1395 | |
1396 | return 0; |
1397 | } |
1398 | |
1399 | static ssize_t proc_readsys(struct file * file, char __user * buf, |
1400 | size_t count, loff_t *ppos) |
1401 | { |
1402 | return do_rw_proc(0, file, buf, count, ppos); |
1403 | } |
1404 | |
1405 | static ssize_t proc_writesys(struct file * file, const char __user * buf, |
1406 | size_t count, loff_t *ppos) |
1407 | { |
1408 | return do_rw_proc(1, file, (char __user *) buf, count, ppos); |
1409 | } |
1410 | |
1411 | /** |
1412 | * proc_dostring - read a string sysctl |
1413 | * @table: the sysctl table |
1414 | * @write: %TRUE if this is a write to the sysctl file |
1415 | * @filp: the file structure |
1416 | * @buffer: the user buffer |
1417 | * @lenp: the size of the user buffer |
1418 | * @ppos: file position |
1419 | * |
1420 | * Reads/writes a string from/to the user buffer. If the kernel |
1421 | * buffer provided is not large enough to hold the string, the |
1422 | * string is truncated. The copied string is %NULL-terminated. |
1423 | * If the string is being read by the user process, it is copied |
1424 | * and a newline '\n' is added. It is truncated if the buffer is |
1425 | * not large enough. |
1426 | * |
1427 | * Returns 0 on success. |
1428 | */ |
1429 | int proc_dostring(ctl_table *table, int write, struct file *filp, |
1430 | void __user *buffer, size_t *lenp, loff_t *ppos) |
1431 | { |
1432 | size_t len; |
1433 | char __user *p; |
1434 | char c; |
1435 | |
1436 | if (!table->data || !table->maxlen || !*lenp || |
1437 | (*ppos && !write)) { |
1438 | *lenp = 0; |
1439 | return 0; |
1440 | } |
1441 | |
1442 | if (write) { |
1443 | len = 0; |
1444 | p = buffer; |
1445 | while (len < *lenp) { |
1446 | if (get_user(c, p++)) |
1447 | return -EFAULT; |
1448 | if (c == 0 || c == '\n') |
1449 | break; |
1450 | len++; |
1451 | } |
1452 | if (len >= table->maxlen) |
1453 | len = table->maxlen-1; |
1454 | if(copy_from_user(table->data, buffer, len)) |
1455 | return -EFAULT; |
1456 | ((char *) table->data)[len] = 0; |
1457 | *ppos += *lenp; |
1458 | } else { |
1459 | len = strlen(table->data); |
1460 | if (len > table->maxlen) |
1461 | len = table->maxlen; |
1462 | if (len > *lenp) |
1463 | len = *lenp; |
1464 | if (len) |
1465 | if(copy_to_user(buffer, table->data, len)) |
1466 | return -EFAULT; |
1467 | if (len < *lenp) { |
1468 | if(put_user('\n', ((char __user *) buffer) + len)) |
1469 | return -EFAULT; |
1470 | len++; |
1471 | } |
1472 | *lenp = len; |
1473 | *ppos += len; |
1474 | } |
1475 | return 0; |
1476 | } |
1477 | |
1478 | /* |
1479 | * Special case of dostring for the UTS structure. This has locks |
1480 | * to observe. Should this be in kernel/sys.c ???? |
1481 | */ |
1482 | |
1483 | static int proc_doutsstring(ctl_table *table, int write, struct file *filp, |
1484 | void __user *buffer, size_t *lenp, loff_t *ppos) |
1485 | { |
1486 | int r; |
1487 | |
1488 | if (!write) { |
1489 | down_read(&uts_sem); |
1490 | r=proc_dostring(table,0,filp,buffer,lenp, ppos); |
1491 | up_read(&uts_sem); |
1492 | } else { |
1493 | down_write(&uts_sem); |
1494 | r=proc_dostring(table,1,filp,buffer,lenp, ppos); |
1495 | up_write(&uts_sem); |
1496 | } |
1497 | return r; |
1498 | } |
1499 | |
1500 | static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp, |
1501 | int *valp, |
1502 | int write, void *data) |
1503 | { |
1504 | if (write) { |
1505 | *valp = *negp ? -*lvalp : *lvalp; |
1506 | } else { |
1507 | int val = *valp; |
1508 | if (val < 0) { |
1509 | *negp = -1; |
1510 | *lvalp = (unsigned long)-val; |
1511 | } else { |
1512 | *negp = 0; |
1513 | *lvalp = (unsigned long)val; |
1514 | } |
1515 | } |
1516 | return 0; |
1517 | } |
1518 | |
1519 | static int do_proc_dointvec(ctl_table *table, int write, struct file *filp, |
1520 | void __user *buffer, size_t *lenp, loff_t *ppos, |
1521 | int (*conv)(int *negp, unsigned long *lvalp, int *valp, |
1522 | int write, void *data), |
1523 | void *data) |
1524 | { |
1525 | #define TMPBUFLEN 21 |
1526 | int *i, vleft, first=1, neg, val; |
1527 | unsigned long lval; |
1528 | size_t left, len; |
1529 | |
1530 | char buf[TMPBUFLEN], *p; |
1531 | char __user *s = buffer; |
1532 | |
1533 | if (!table->data || !table->maxlen || !*lenp || |
1534 | (*ppos && !write)) { |
1535 | *lenp = 0; |
1536 | return 0; |
1537 | } |
1538 | |
1539 | i = (int *) table->data; |
1540 | vleft = table->maxlen / sizeof(*i); |
1541 | left = *lenp; |
1542 | |
1543 | if (!conv) |
1544 | conv = do_proc_dointvec_conv; |
1545 | |
1546 | for (; left && vleft--; i++, first=0) { |
1547 | if (write) { |
1548 | while (left) { |
1549 | char c; |
1550 | if (get_user(c, s)) |
1551 | return -EFAULT; |
1552 | if (!isspace(c)) |
1553 | break; |
1554 | left--; |
1555 | s++; |
1556 | } |
1557 | if (!left) |
1558 | break; |
1559 | neg = 0; |
1560 | len = left; |
1561 | if (len > sizeof(buf) - 1) |
1562 | len = sizeof(buf) - 1; |
1563 | if (copy_from_user(buf, s, len)) |
1564 | return -EFAULT; |
1565 | buf[len] = 0; |
1566 | p = buf; |
1567 | if (*p == '-' && left > 1) { |
1568 | neg = 1; |
1569 | left--, p++; |
1570 | } |
1571 | if (*p < '0' || *p > '9') |
1572 | break; |
1573 | |
1574 | lval = simple_strtoul(p, &p, 0); |
1575 | |
1576 | len = p-buf; |
1577 | if ((len < left) && *p && !isspace(*p)) |
1578 | break; |
1579 | if (neg) |
1580 | val = -val; |
1581 | s += len; |
1582 | left -= len; |
1583 | |
1584 | if (conv(&neg, &lval, i, 1, data)) |
1585 | break; |
1586 | } else { |
1587 | p = buf; |
1588 | if (!first) |
1589 | *p++ = '\t'; |
1590 | |
1591 | if (conv(&neg, &lval, i, 0, data)) |
1592 | break; |
1593 | |
1594 | sprintf(p, "%s%lu", neg ? "-" : "", lval); |
1595 | len = strlen(buf); |
1596 | if (len > left) |
1597 | len = left; |
1598 | if(copy_to_user(s, buf, len)) |
1599 | return -EFAULT; |
1600 | left -= len; |
1601 | s += len; |
1602 | } |
1603 | } |
1604 | |
1605 | if (!write && !first && left) { |
1606 | if(put_user('\n', s)) |
1607 | return -EFAULT; |
1608 | left--, s++; |
1609 | } |
1610 | if (write) { |
1611 | while (left) { |
1612 | char c; |
1613 | if (get_user(c, s++)) |
1614 | return -EFAULT; |
1615 | if (!isspace(c)) |
1616 | break; |
1617 | left--; |
1618 | } |
1619 | } |
1620 | if (write && first) |
1621 | return -EINVAL; |
1622 | *lenp -= left; |
1623 | *ppos += *lenp; |
1624 | return 0; |
1625 | #undef TMPBUFLEN |
1626 | } |
1627 | |
1628 | /** |
1629 | * proc_dointvec - read a vector of integers |
1630 | * @table: the sysctl table |
1631 | * @write: %TRUE if this is a write to the sysctl file |
1632 | * @filp: the file structure |
1633 | * @buffer: the user buffer |
1634 | * @lenp: the size of the user buffer |
1635 | * @ppos: file position |
1636 | * |
1637 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer |
1638 | * values from/to the user buffer, treated as an ASCII string. |
1639 | * |
1640 | * Returns 0 on success. |
1641 | */ |
1642 | int proc_dointvec(ctl_table *table, int write, struct file *filp, |
1643 | void __user *buffer, size_t *lenp, loff_t *ppos) |
1644 | { |
1645 | return do_proc_dointvec(table,write,filp,buffer,lenp,ppos, |
1646 | NULL,NULL); |
1647 | } |
1648 | |
1649 | #define OP_SET 0 |
1650 | #define OP_AND 1 |
1651 | #define OP_OR 2 |
1652 | #define OP_MAX 3 |
1653 | #define OP_MIN 4 |
1654 | |
1655 | static int do_proc_dointvec_bset_conv(int *negp, unsigned long *lvalp, |
1656 | int *valp, |
1657 | int write, void *data) |
1658 | { |
1659 | int op = *(int *)data; |
1660 | if (write) { |
1661 | int val = *negp ? -*lvalp : *lvalp; |
1662 | switch(op) { |
1663 | case OP_SET: *valp = val; break; |
1664 | case OP_AND: *valp &= val; break; |
1665 | case OP_OR: *valp |= val; break; |
1666 | case OP_MAX: if(*valp < val) |
1667 | *valp = val; |
1668 | break; |
1669 | case OP_MIN: if(*valp > val) |
1670 | *valp = val; |
1671 | break; |
1672 | } |
1673 | } else { |
1674 | int val = *valp; |
1675 | if (val < 0) { |
1676 | *negp = -1; |
1677 | *lvalp = (unsigned long)-val; |
1678 | } else { |
1679 | *negp = 0; |
1680 | *lvalp = (unsigned long)val; |
1681 | } |
1682 | } |
1683 | return 0; |
1684 | } |
1685 | |
1686 | /* |
1687 | * init may raise the set. |
1688 | */ |
1689 | |
1690 | int proc_dointvec_bset(ctl_table *table, int write, struct file *filp, |
1691 | void __user *buffer, size_t *lenp, loff_t *ppos) |
1692 | { |
1693 | int op; |
1694 | |
1695 | if (!capable(CAP_SYS_MODULE)) { |
1696 | return -EPERM; |
1697 | } |
1698 | |
1699 | op = (current->pid == 1) ? OP_SET : OP_AND; |
1700 | return do_proc_dointvec(table,write,filp,buffer,lenp,ppos, |
1701 | do_proc_dointvec_bset_conv,&op); |
1702 | } |
1703 | |
1704 | struct do_proc_dointvec_minmax_conv_param { |
1705 | int *min; |
1706 | int *max; |
1707 | }; |
1708 | |
1709 | static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp, |
1710 | int *valp, |
1711 | int write, void *data) |
1712 | { |
1713 | struct do_proc_dointvec_minmax_conv_param *param = data; |
1714 | if (write) { |
1715 | int val = *negp ? -*lvalp : *lvalp; |
1716 | if ((param->min && *param->min > val) || |
1717 | (param->max && *param->max < val)) |
1718 | return -EINVAL; |
1719 | *valp = val; |
1720 | } else { |
1721 | int val = *valp; |
1722 | if (val < 0) { |
1723 | *negp = -1; |
1724 | *lvalp = (unsigned long)-val; |
1725 | } else { |
1726 | *negp = 0; |
1727 | *lvalp = (unsigned long)val; |
1728 | } |
1729 | } |
1730 | return 0; |
1731 | } |
1732 | |
1733 | /** |
1734 | * proc_dointvec_minmax - read a vector of integers with min/max values |
1735 | * @table: the sysctl table |
1736 | * @write: %TRUE if this is a write to the sysctl file |
1737 | * @filp: the file structure |
1738 | * @buffer: the user buffer |
1739 | * @lenp: the size of the user buffer |
1740 | * @ppos: file position |
1741 | * |
1742 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer |
1743 | * values from/to the user buffer, treated as an ASCII string. |
1744 | * |
1745 | * This routine will ensure the values are within the range specified by |
1746 | * table->extra1 (min) and table->extra2 (max). |
1747 | * |
1748 | * Returns 0 on success. |
1749 | */ |
1750 | int proc_dointvec_minmax(ctl_table *table, int write, struct file *filp, |
1751 | void __user *buffer, size_t *lenp, loff_t *ppos) |
1752 | { |
1753 | struct do_proc_dointvec_minmax_conv_param param = { |
1754 | .min = (int *) table->extra1, |
1755 | .max = (int *) table->extra2, |
1756 | }; |
1757 | return do_proc_dointvec(table, write, filp, buffer, lenp, ppos, |
1758 | do_proc_dointvec_minmax_conv, ¶m); |
1759 | } |
1760 | |
1761 | static int do_proc_doulongvec_minmax(ctl_table *table, int write, |
1762 | struct file *filp, |
1763 | void __user *buffer, |
1764 | size_t *lenp, loff_t *ppos, |
1765 | unsigned long convmul, |
1766 | unsigned long convdiv) |
1767 | { |
1768 | #define TMPBUFLEN 21 |
1769 | unsigned long *i, *min, *max, val; |
1770 | int vleft, first=1, neg; |
1771 | size_t len, left; |
1772 | char buf[TMPBUFLEN], *p; |
1773 | char __user *s = buffer; |
1774 | |
1775 | if (!table->data || !table->maxlen || !*lenp || |
1776 | (*ppos && !write)) { |
1777 | *lenp = 0; |
1778 | return 0; |
1779 | } |
1780 | |
1781 | i = (unsigned long *) table->data; |
1782 | min = (unsigned long *) table->extra1; |
1783 | max = (unsigned long *) table->extra2; |
1784 | vleft = table->maxlen / sizeof(unsigned long); |
1785 | left = *lenp; |
1786 | |
1787 | for (; left && vleft--; i++, min++, max++, first=0) { |
1788 | if (write) { |
1789 | while (left) { |
1790 | char c; |
1791 | if (get_user(c, s)) |
1792 | return -EFAULT; |
1793 | if (!isspace(c)) |
1794 | break; |
1795 | left--; |
1796 | s++; |
1797 | } |
1798 | if (!left) |
1799 | break; |
1800 | neg = 0; |
1801 | len = left; |
1802 | if (len > TMPBUFLEN-1) |
1803 | len = TMPBUFLEN-1; |
1804 | if (copy_from_user(buf, s, len)) |
1805 | return -EFAULT; |
1806 | buf[len] = 0; |
1807 | p = buf; |
1808 | if (*p == '-' && left > 1) { |
1809 | neg = 1; |
1810 | left--, p++; |
1811 | } |
1812 | if (*p < '0' || *p > '9') |
1813 | break; |
1814 | val = simple_strtoul(p, &p, 0) * convmul / convdiv ; |
1815 | len = p-buf; |
1816 | if ((len < left) && *p && !isspace(*p)) |
1817 | break; |
1818 | if (neg) |
1819 | val = -val; |
1820 | s += len; |
1821 | left -= len; |
1822 | |
1823 | if(neg) |
1824 | continue; |
1825 | if ((min && val < *min) || (max && val > *max)) |
1826 | continue; |
1827 | *i = val; |
1828 | } else { |
1829 | p = buf; |
1830 | if (!first) |
1831 | *p++ = '\t'; |
1832 | sprintf(p, "%lu", convdiv * (*i) / convmul); |
1833 | len = strlen(buf); |
1834 | if (len > left) |
1835 | len = left; |
1836 | if(copy_to_user(s, buf, len)) |
1837 | return -EFAULT; |
1838 | left -= len; |
1839 | s += len; |
1840 | } |
1841 | } |
1842 | |
1843 | if (!write && !first && left) { |
1844 | if(put_user('\n', s)) |
1845 | return -EFAULT; |
1846 | left--, s++; |
1847 | } |
1848 | if (write) { |
1849 | while (left) { |
1850 | char c; |
1851 | if (get_user(c, s++)) |
1852 | return -EFAULT; |
1853 | if (!isspace(c)) |
1854 | break; |
1855 | left--; |
1856 | } |
1857 | } |
1858 | if (write && first) |
1859 | return -EINVAL; |
1860 | *lenp -= left; |
1861 | *ppos += *lenp; |
1862 | return 0; |
1863 | #undef TMPBUFLEN |
1864 | } |
1865 | |
1866 | /** |
1867 | * proc_doulongvec_minmax - read a vector of long integers with min/max values |
1868 | * @table: the sysctl table |
1869 | * @write: %TRUE if this is a write to the sysctl file |
1870 | * @filp: the file structure |
1871 | * @buffer: the user buffer |
1872 | * @lenp: the size of the user buffer |
1873 | * @ppos: file position |
1874 | * |
1875 | * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long |
1876 | * values from/to the user buffer, treated as an ASCII string. |
1877 | * |
1878 | * This routine will ensure the values are within the range specified by |
1879 | * table->extra1 (min) and table->extra2 (max). |
1880 | * |
1881 | * Returns 0 on success. |
1882 | */ |
1883 | int proc_doulongvec_minmax(ctl_table *table, int write, struct file *filp, |
1884 | void __user *buffer, size_t *lenp, loff_t *ppos) |
1885 | { |
1886 | return do_proc_doulongvec_minmax(table, write, filp, buffer, lenp, ppos, 1l, 1l); |
1887 | } |
1888 | |
1889 | /** |
1890 | * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values |
1891 | * @table: the sysctl table |
1892 | * @write: %TRUE if this is a write to the sysctl file |
1893 | * @filp: the file structure |
1894 | * @buffer: the user buffer |
1895 | * @lenp: the size of the user buffer |
1896 | * @ppos: file position |
1897 | * |
1898 | * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long |
1899 | * values from/to the user buffer, treated as an ASCII string. The values |
1900 | * are treated as milliseconds, and converted to jiffies when they are stored. |
1901 | * |
1902 | * This routine will ensure the values are within the range specified by |
1903 | * table->extra1 (min) and table->extra2 (max). |
1904 | * |
1905 | * Returns 0 on success. |
1906 | */ |
1907 | int proc_doulongvec_ms_jiffies_minmax(ctl_table *table, int write, |
1908 | struct file *filp, |
1909 | void __user *buffer, |
1910 | size_t *lenp, loff_t *ppos) |
1911 | { |
1912 | return do_proc_doulongvec_minmax(table, write, filp, buffer, |
1913 | lenp, ppos, HZ, 1000l); |
1914 | } |
1915 | |
1916 | |
1917 | static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp, |
1918 | int *valp, |
1919 | int write, void *data) |
1920 | { |
1921 | if (write) { |
1922 | *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ); |
1923 | } else { |
1924 | int val = *valp; |
1925 | unsigned long lval; |
1926 | if (val < 0) { |
1927 | *negp = -1; |
1928 | lval = (unsigned long)-val; |
1929 | } else { |
1930 | *negp = 0; |
1931 | lval = (unsigned long)val; |
1932 | } |
1933 | *lvalp = lval / HZ; |
1934 | } |
1935 | return 0; |
1936 | } |
1937 | |
1938 | static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp, |
1939 | int *valp, |
1940 | int write, void *data) |
1941 | { |
1942 | if (write) { |
1943 | *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp); |
1944 | } else { |
1945 | int val = *valp; |
1946 | unsigned long lval; |
1947 | if (val < 0) { |
1948 | *negp = -1; |
1949 | lval = (unsigned long)-val; |
1950 | } else { |
1951 | *negp = 0; |
1952 | lval = (unsigned long)val; |
1953 | } |
1954 | *lvalp = jiffies_to_clock_t(lval); |
1955 | } |
1956 | return 0; |
1957 | } |
1958 | |
1959 | static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp, |
1960 | int *valp, |
1961 | int write, void *data) |
1962 | { |
1963 | if (write) { |
1964 | *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp); |
1965 | } else { |
1966 | int val = *valp; |
1967 | unsigned long lval; |
1968 | if (val < 0) { |
1969 | *negp = -1; |
1970 | lval = (unsigned long)-val; |
1971 | } else { |
1972 | *negp = 0; |
1973 | lval = (unsigned long)val; |
1974 | } |
1975 | *lvalp = jiffies_to_msecs(lval); |
1976 | } |
1977 | return 0; |
1978 | } |
1979 | |
1980 | /** |
1981 | * proc_dointvec_jiffies - read a vector of integers as seconds |
1982 | * @table: the sysctl table |
1983 | * @write: %TRUE if this is a write to the sysctl file |
1984 | * @filp: the file structure |
1985 | * @buffer: the user buffer |
1986 | * @lenp: the size of the user buffer |
1987 | * @ppos: file position |
1988 | * |
1989 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer |
1990 | * values from/to the user buffer, treated as an ASCII string. |
1991 | * The values read are assumed to be in seconds, and are converted into |
1992 | * jiffies. |
1993 | * |
1994 | * Returns 0 on success. |
1995 | */ |
1996 | int proc_dointvec_jiffies(ctl_table *table, int write, struct file *filp, |
1997 | void __user *buffer, size_t *lenp, loff_t *ppos) |
1998 | { |
1999 | return do_proc_dointvec(table,write,filp,buffer,lenp,ppos, |
2000 | do_proc_dointvec_jiffies_conv,NULL); |
2001 | } |
2002 | |
2003 | /** |
2004 | * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds |
2005 | * @table: the sysctl table |
2006 | * @write: %TRUE if this is a write to the sysctl file |
2007 | * @filp: the file structure |
2008 | * @buffer: the user buffer |
2009 | * @lenp: the size of the user buffer |
2010 | * |
2011 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer |
2012 | * values from/to the user buffer, treated as an ASCII string. |
2013 | * The values read are assumed to be in 1/USER_HZ seconds, and |
2014 | * are converted into jiffies. |
2015 | * |
2016 | * Returns 0 on success. |
2017 | */ |
2018 | int proc_dointvec_userhz_jiffies(ctl_table *table, int write, struct file *filp, |
2019 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2020 | { |
2021 | return do_proc_dointvec(table,write,filp,buffer,lenp,ppos, |
2022 | do_proc_dointvec_userhz_jiffies_conv,NULL); |
2023 | } |
2024 | |
2025 | /** |
2026 | * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds |
2027 | * @table: the sysctl table |
2028 | * @write: %TRUE if this is a write to the sysctl file |
2029 | * @filp: the file structure |
2030 | * @buffer: the user buffer |
2031 | * @lenp: the size of the user buffer |
2032 | * @ppos: file position |
2033 | * @ppos: the current position in the file |
2034 | * |
2035 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer |
2036 | * values from/to the user buffer, treated as an ASCII string. |
2037 | * The values read are assumed to be in 1/1000 seconds, and |
2038 | * are converted into jiffies. |
2039 | * |
2040 | * Returns 0 on success. |
2041 | */ |
2042 | int proc_dointvec_ms_jiffies(ctl_table *table, int write, struct file *filp, |
2043 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2044 | { |
2045 | return do_proc_dointvec(table, write, filp, buffer, lenp, ppos, |
2046 | do_proc_dointvec_ms_jiffies_conv, NULL); |
2047 | } |
2048 | |
2049 | #else /* CONFIG_PROC_FS */ |
2050 | |
2051 | int proc_dostring(ctl_table *table, int write, struct file *filp, |
2052 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2053 | { |
2054 | return -ENOSYS; |
2055 | } |
2056 | |
2057 | static int proc_doutsstring(ctl_table *table, int write, struct file *filp, |
2058 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2059 | { |
2060 | return -ENOSYS; |
2061 | } |
2062 | |
2063 | int proc_dointvec(ctl_table *table, int write, struct file *filp, |
2064 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2065 | { |
2066 | return -ENOSYS; |
2067 | } |
2068 | |
2069 | int proc_dointvec_bset(ctl_table *table, int write, struct file *filp, |
2070 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2071 | { |
2072 | return -ENOSYS; |
2073 | } |
2074 | |
2075 | int proc_dointvec_minmax(ctl_table *table, int write, struct file *filp, |
2076 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2077 | { |
2078 | return -ENOSYS; |
2079 | } |
2080 | |
2081 | int proc_dointvec_jiffies(ctl_table *table, int write, struct file *filp, |
2082 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2083 | { |
2084 | return -ENOSYS; |
2085 | } |
2086 | |
2087 | int proc_dointvec_userhz_jiffies(ctl_table *table, int write, struct file *filp, |
2088 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2089 | { |
2090 | return -ENOSYS; |
2091 | } |
2092 | |
2093 | int proc_dointvec_ms_jiffies(ctl_table *table, int write, struct file *filp, |
2094 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2095 | { |
2096 | return -ENOSYS; |
2097 | } |
2098 | |
2099 | int proc_doulongvec_minmax(ctl_table *table, int write, struct file *filp, |
2100 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2101 | { |
2102 | return -ENOSYS; |
2103 | } |
2104 | |
2105 | int proc_doulongvec_ms_jiffies_minmax(ctl_table *table, int write, |
2106 | struct file *filp, |
2107 | void __user *buffer, |
2108 | size_t *lenp, loff_t *ppos) |
2109 | { |
2110 | return -ENOSYS; |
2111 | } |
2112 | |
2113 | |
2114 | #endif /* CONFIG_PROC_FS */ |
2115 | |
2116 | |
2117 | /* |
2118 | * General sysctl support routines |
2119 | */ |
2120 | |
2121 | /* The generic string strategy routine: */ |
2122 | int sysctl_string(ctl_table *table, int __user *name, int nlen, |
2123 | void __user *oldval, size_t __user *oldlenp, |
2124 | void __user *newval, size_t newlen, void **context) |
2125 | { |
2126 | size_t l, len; |
2127 | |
2128 | if (!table->data || !table->maxlen) |
2129 | return -ENOTDIR; |
2130 | |
2131 | if (oldval && oldlenp) { |
2132 | if (get_user(len, oldlenp)) |
2133 | return -EFAULT; |
2134 | if (len) { |
2135 | l = strlen(table->data); |
2136 | if (len > l) len = l; |
2137 | if (len >= table->maxlen) |
2138 | len = table->maxlen; |
2139 | if(copy_to_user(oldval, table->data, len)) |
2140 | return -EFAULT; |
2141 | if(put_user(0, ((char __user *) oldval) + len)) |
2142 | return -EFAULT; |
2143 | if(put_user(len, oldlenp)) |
2144 | return -EFAULT; |
2145 | } |
2146 | } |
2147 | if (newval && newlen) { |
2148 | len = newlen; |
2149 | if (len > table->maxlen) |
2150 | len = table->maxlen; |
2151 | if(copy_from_user(table->data, newval, len)) |
2152 | return -EFAULT; |
2153 | if (len == table->maxlen) |
2154 | len--; |
2155 | ((char *) table->data)[len] = 0; |
2156 | } |
2157 | return 0; |
2158 | } |
2159 | |
2160 | /* |
2161 | * This function makes sure that all of the integers in the vector |
2162 | * are between the minimum and maximum values given in the arrays |
2163 | * table->extra1 and table->extra2, respectively. |
2164 | */ |
2165 | int sysctl_intvec(ctl_table *table, int __user *name, int nlen, |
2166 | void __user *oldval, size_t __user *oldlenp, |
2167 | void __user *newval, size_t newlen, void **context) |
2168 | { |
2169 | |
2170 | if (newval && newlen) { |
2171 | int __user *vec = (int __user *) newval; |
2172 | int *min = (int *) table->extra1; |
2173 | int *max = (int *) table->extra2; |
2174 | size_t length; |
2175 | int i; |
2176 | |
2177 | if (newlen % sizeof(int) != 0) |
2178 | return -EINVAL; |
2179 | |
2180 | if (!table->extra1 && !table->extra2) |
2181 | return 0; |
2182 | |
2183 | if (newlen > table->maxlen) |
2184 | newlen = table->maxlen; |
2185 | length = newlen / sizeof(int); |
2186 | |
2187 | for (i = 0; i < length; i++) { |
2188 | int value; |
2189 | if (get_user(value, vec + i)) |
2190 | return -EFAULT; |
2191 | if (min && value < min[i]) |
2192 | return -EINVAL; |
2193 | if (max && value > max[i]) |
2194 | return -EINVAL; |
2195 | } |
2196 | } |
2197 | return 0; |
2198 | } |
2199 | |
2200 | /* Strategy function to convert jiffies to seconds */ |
2201 | int sysctl_jiffies(ctl_table *table, int __user *name, int nlen, |
2202 | void __user *oldval, size_t __user *oldlenp, |
2203 | void __user *newval, size_t newlen, void **context) |
2204 | { |
2205 | if (oldval) { |
2206 | size_t olen; |
2207 | if (oldlenp) { |
2208 | if (get_user(olen, oldlenp)) |
2209 | return -EFAULT; |
2210 | if (olen!=sizeof(int)) |
2211 | return -EINVAL; |
2212 | } |
2213 | if (put_user(*(int *)(table->data)/HZ, (int __user *)oldval) || |
2214 | (oldlenp && put_user(sizeof(int),oldlenp))) |
2215 | return -EFAULT; |
2216 | } |
2217 | if (newval && newlen) { |
2218 | int new; |
2219 | if (newlen != sizeof(int)) |
2220 | return -EINVAL; |
2221 | if (get_user(new, (int __user *)newval)) |
2222 | return -EFAULT; |
2223 | *(int *)(table->data) = new*HZ; |
2224 | } |
2225 | return 1; |
2226 | } |
2227 | |
2228 | /* Strategy function to convert jiffies to seconds */ |
2229 | int sysctl_ms_jiffies(ctl_table *table, int __user *name, int nlen, |
2230 | void __user *oldval, size_t __user *oldlenp, |
2231 | void __user *newval, size_t newlen, void **context) |
2232 | { |
2233 | if (oldval) { |
2234 | size_t olen; |
2235 | if (oldlenp) { |
2236 | if (get_user(olen, oldlenp)) |
2237 | return -EFAULT; |
2238 | if (olen!=sizeof(int)) |
2239 | return -EINVAL; |
2240 | } |
2241 | if (put_user(jiffies_to_msecs(*(int *)(table->data)), (int __user *)oldval) || |
2242 | (oldlenp && put_user(sizeof(int),oldlenp))) |
2243 | return -EFAULT; |
2244 | } |
2245 | if (newval && newlen) { |
2246 | int new; |
2247 | if (newlen != sizeof(int)) |
2248 | return -EINVAL; |
2249 | if (get_user(new, (int __user *)newval)) |
2250 | return -EFAULT; |
2251 | *(int *)(table->data) = msecs_to_jiffies(new); |
2252 | } |
2253 | return 1; |
2254 | } |
2255 | |
2256 | #else /* CONFIG_SYSCTL */ |
2257 | |
2258 | |
2259 | asmlinkage long sys_sysctl(struct __sysctl_args __user *args) |
2260 | { |
2261 | return -ENOSYS; |
2262 | } |
2263 | |
2264 | int sysctl_string(ctl_table *table, int __user *name, int nlen, |
2265 | void __user *oldval, size_t __user *oldlenp, |
2266 | void __user *newval, size_t newlen, void **context) |
2267 | { |
2268 | return -ENOSYS; |
2269 | } |
2270 | |
2271 | int sysctl_intvec(ctl_table *table, int __user *name, int nlen, |
2272 | void __user *oldval, size_t __user *oldlenp, |
2273 | void __user *newval, size_t newlen, void **context) |
2274 | { |
2275 | return -ENOSYS; |
2276 | } |
2277 | |
2278 | int sysctl_jiffies(ctl_table *table, int __user *name, int nlen, |
2279 | void __user *oldval, size_t __user *oldlenp, |
2280 | void __user *newval, size_t newlen, void **context) |
2281 | { |
2282 | return -ENOSYS; |
2283 | } |
2284 | |
2285 | int sysctl_ms_jiffies(ctl_table *table, int __user *name, int nlen, |
2286 | void __user *oldval, size_t __user *oldlenp, |
2287 | void __user *newval, size_t newlen, void **context) |
2288 | { |
2289 | return -ENOSYS; |
2290 | } |
2291 | |
2292 | int proc_dostring(ctl_table *table, int write, struct file *filp, |
2293 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2294 | { |
2295 | return -ENOSYS; |
2296 | } |
2297 | |
2298 | int proc_dointvec(ctl_table *table, int write, struct file *filp, |
2299 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2300 | { |
2301 | return -ENOSYS; |
2302 | } |
2303 | |
2304 | int proc_dointvec_bset(ctl_table *table, int write, struct file *filp, |
2305 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2306 | { |
2307 | return -ENOSYS; |
2308 | } |
2309 | |
2310 | int proc_dointvec_minmax(ctl_table *table, int write, struct file *filp, |
2311 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2312 | { |
2313 | return -ENOSYS; |
2314 | } |
2315 | |
2316 | int proc_dointvec_jiffies(ctl_table *table, int write, struct file *filp, |
2317 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2318 | { |
2319 | return -ENOSYS; |
2320 | } |
2321 | |
2322 | int proc_dointvec_userhz_jiffies(ctl_table *table, int write, struct file *filp, |
2323 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2324 | { |
2325 | return -ENOSYS; |
2326 | } |
2327 | |
2328 | int proc_dointvec_ms_jiffies(ctl_table *table, int write, struct file *filp, |
2329 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2330 | { |
2331 | return -ENOSYS; |
2332 | } |
2333 | |
2334 | int proc_doulongvec_minmax(ctl_table *table, int write, struct file *filp, |
2335 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2336 | { |
2337 | return -ENOSYS; |
2338 | } |
2339 | |
2340 | int proc_doulongvec_ms_jiffies_minmax(ctl_table *table, int write, |
2341 | struct file *filp, |
2342 | void __user *buffer, |
2343 | size_t *lenp, loff_t *ppos) |
2344 | { |
2345 | return -ENOSYS; |
2346 | } |
2347 | |
2348 | struct ctl_table_header * register_sysctl_table(ctl_table * table, |
2349 | int insert_at_head) |
2350 | { |
2351 | return NULL; |
2352 | } |
2353 | |
2354 | void unregister_sysctl_table(struct ctl_table_header * table) |
2355 | { |
2356 | } |
2357 | |
2358 | #endif /* CONFIG_SYSCTL */ |
2359 | |
2360 | /* |
2361 | * No sense putting this after each symbol definition, twice, |
2362 | * exception granted :-) |
2363 | */ |
2364 | EXPORT_SYMBOL(proc_dointvec); |
2365 | EXPORT_SYMBOL(proc_dointvec_jiffies); |
2366 | EXPORT_SYMBOL(proc_dointvec_minmax); |
2367 | EXPORT_SYMBOL(proc_dointvec_userhz_jiffies); |
2368 | EXPORT_SYMBOL(proc_dointvec_ms_jiffies); |
2369 | EXPORT_SYMBOL(proc_dostring); |
2370 | EXPORT_SYMBOL(proc_doulongvec_minmax); |
2371 | EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax); |
2372 | EXPORT_SYMBOL(register_sysctl_table); |
2373 | EXPORT_SYMBOL(sysctl_intvec); |
2374 | EXPORT_SYMBOL(sysctl_jiffies); |
2375 | EXPORT_SYMBOL(sysctl_ms_jiffies); |
2376 | EXPORT_SYMBOL(sysctl_string); |
2377 | EXPORT_SYMBOL(unregister_sysctl_table); |