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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> | |
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> | |
20380731 | 34 | #include <linux/net.h> |
1da177e4 LT |
35 | #include <linux/sysrq.h> |
36 | #include <linux/highuid.h> | |
37 | #include <linux/writeback.h> | |
38 | #include <linux/hugetlb.h> | |
39 | #include <linux/security.h> | |
40 | #include <linux/initrd.h> | |
41 | #include <linux/times.h> | |
42 | #include <linux/limits.h> | |
43 | #include <linux/dcache.h> | |
44 | #include <linux/syscalls.h> | |
45 | ||
46 | #include <asm/uaccess.h> | |
47 | #include <asm/processor.h> | |
48 | ||
49 | #ifdef CONFIG_ROOT_NFS | |
50 | #include <linux/nfs_fs.h> | |
51 | #endif | |
52 | ||
53 | #if defined(CONFIG_SYSCTL) | |
54 | ||
55 | /* External variables not in a header file. */ | |
56 | extern int C_A_D; | |
57 | extern int sysctl_overcommit_memory; | |
58 | extern int sysctl_overcommit_ratio; | |
59 | extern int max_threads; | |
60 | extern int sysrq_enabled; | |
61 | extern int core_uses_pid; | |
d6e71144 | 62 | extern int suid_dumpable; |
1da177e4 LT |
63 | extern char core_pattern[]; |
64 | extern int cad_pid; | |
65 | extern int pid_max; | |
66 | extern int min_free_kbytes; | |
67 | extern int printk_ratelimit_jiffies; | |
68 | extern int printk_ratelimit_burst; | |
69 | extern int pid_max_min, pid_max_max; | |
70 | ||
71 | #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86) | |
72 | int unknown_nmi_panic; | |
73 | extern int proc_unknown_nmi_panic(ctl_table *, int, struct file *, | |
74 | void __user *, size_t *, loff_t *); | |
75 | #endif | |
76 | ||
77 | /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */ | |
78 | static int maxolduid = 65535; | |
79 | static int minolduid; | |
80 | ||
81 | static int ngroups_max = NGROUPS_MAX; | |
82 | ||
83 | #ifdef CONFIG_KMOD | |
84 | extern char modprobe_path[]; | |
85 | #endif | |
86 | #ifdef CONFIG_HOTPLUG | |
87 | extern char hotplug_path[]; | |
88 | #endif | |
89 | #ifdef CONFIG_CHR_DEV_SG | |
90 | extern int sg_big_buff; | |
91 | #endif | |
92 | #ifdef CONFIG_SYSVIPC | |
93 | extern size_t shm_ctlmax; | |
94 | extern size_t shm_ctlall; | |
95 | extern int shm_ctlmni; | |
96 | extern int msg_ctlmax; | |
97 | extern int msg_ctlmnb; | |
98 | extern int msg_ctlmni; | |
99 | extern int sem_ctls[]; | |
100 | #endif | |
101 | ||
102 | #ifdef __sparc__ | |
103 | extern char reboot_command []; | |
104 | extern int stop_a_enabled; | |
105 | extern int scons_pwroff; | |
106 | #endif | |
107 | ||
108 | #ifdef __hppa__ | |
109 | extern int pwrsw_enabled; | |
110 | extern int unaligned_enabled; | |
111 | #endif | |
112 | ||
113 | #ifdef CONFIG_ARCH_S390 | |
114 | #ifdef CONFIG_MATHEMU | |
115 | extern int sysctl_ieee_emulation_warnings; | |
116 | #endif | |
117 | extern int sysctl_userprocess_debug; | |
951f22d5 | 118 | extern int spin_retry; |
1da177e4 LT |
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[]; | |
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 | ||
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 | }, | |
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", | |
400 | .data = &hotplug_path, | |
401 | .maxlen = HOTPLUG_PATH_LEN, | |
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 | }, | |
547 | #ifdef CONFIG_ARCH_S390 | |
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 | }, | |
951f22d5 MS |
649 | #if defined(CONFIG_ARCH_S390) |
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 | }, | |
779 | { | |
780 | .ctl_name = VM_MIN_FREE_KBYTES, | |
781 | .procname = "min_free_kbytes", | |
782 | .data = &min_free_kbytes, | |
783 | .maxlen = sizeof(min_free_kbytes), | |
784 | .mode = 0644, | |
785 | .proc_handler = &min_free_kbytes_sysctl_handler, | |
786 | .strategy = &sysctl_intvec, | |
787 | .extra1 = &zero, | |
788 | }, | |
789 | #ifdef CONFIG_MMU | |
790 | { | |
791 | .ctl_name = VM_MAX_MAP_COUNT, | |
792 | .procname = "max_map_count", | |
793 | .data = &sysctl_max_map_count, | |
794 | .maxlen = sizeof(sysctl_max_map_count), | |
795 | .mode = 0644, | |
796 | .proc_handler = &proc_dointvec | |
797 | }, | |
798 | #endif | |
799 | { | |
800 | .ctl_name = VM_LAPTOP_MODE, | |
801 | .procname = "laptop_mode", | |
802 | .data = &laptop_mode, | |
803 | .maxlen = sizeof(laptop_mode), | |
804 | .mode = 0644, | |
805 | .proc_handler = &proc_dointvec, | |
806 | .strategy = &sysctl_intvec, | |
807 | .extra1 = &zero, | |
808 | }, | |
809 | { | |
810 | .ctl_name = VM_BLOCK_DUMP, | |
811 | .procname = "block_dump", | |
812 | .data = &block_dump, | |
813 | .maxlen = sizeof(block_dump), | |
814 | .mode = 0644, | |
815 | .proc_handler = &proc_dointvec, | |
816 | .strategy = &sysctl_intvec, | |
817 | .extra1 = &zero, | |
818 | }, | |
819 | { | |
820 | .ctl_name = VM_VFS_CACHE_PRESSURE, | |
821 | .procname = "vfs_cache_pressure", | |
822 | .data = &sysctl_vfs_cache_pressure, | |
823 | .maxlen = sizeof(sysctl_vfs_cache_pressure), | |
824 | .mode = 0644, | |
825 | .proc_handler = &proc_dointvec, | |
826 | .strategy = &sysctl_intvec, | |
827 | .extra1 = &zero, | |
828 | }, | |
829 | #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT | |
830 | { | |
831 | .ctl_name = VM_LEGACY_VA_LAYOUT, | |
832 | .procname = "legacy_va_layout", | |
833 | .data = &sysctl_legacy_va_layout, | |
834 | .maxlen = sizeof(sysctl_legacy_va_layout), | |
835 | .mode = 0644, | |
836 | .proc_handler = &proc_dointvec, | |
837 | .strategy = &sysctl_intvec, | |
838 | .extra1 = &zero, | |
839 | }, | |
840 | #endif | |
841 | #ifdef CONFIG_SWAP | |
842 | { | |
843 | .ctl_name = VM_SWAP_TOKEN_TIMEOUT, | |
844 | .procname = "swap_token_timeout", | |
845 | .data = &swap_token_default_timeout, | |
846 | .maxlen = sizeof(swap_token_default_timeout), | |
847 | .mode = 0644, | |
848 | .proc_handler = &proc_dointvec_jiffies, | |
849 | .strategy = &sysctl_jiffies, | |
850 | }, | |
851 | #endif | |
852 | { .ctl_name = 0 } | |
853 | }; | |
854 | ||
855 | static ctl_table proc_table[] = { | |
856 | { .ctl_name = 0 } | |
857 | }; | |
858 | ||
859 | static ctl_table fs_table[] = { | |
860 | { | |
861 | .ctl_name = FS_NRINODE, | |
862 | .procname = "inode-nr", | |
863 | .data = &inodes_stat, | |
864 | .maxlen = 2*sizeof(int), | |
865 | .mode = 0444, | |
866 | .proc_handler = &proc_dointvec, | |
867 | }, | |
868 | { | |
869 | .ctl_name = FS_STATINODE, | |
870 | .procname = "inode-state", | |
871 | .data = &inodes_stat, | |
872 | .maxlen = 7*sizeof(int), | |
873 | .mode = 0444, | |
874 | .proc_handler = &proc_dointvec, | |
875 | }, | |
876 | { | |
877 | .ctl_name = FS_NRFILE, | |
878 | .procname = "file-nr", | |
879 | .data = &files_stat, | |
880 | .maxlen = 3*sizeof(int), | |
881 | .mode = 0444, | |
882 | .proc_handler = &proc_dointvec, | |
883 | }, | |
884 | { | |
885 | .ctl_name = FS_MAXFILE, | |
886 | .procname = "file-max", | |
887 | .data = &files_stat.max_files, | |
888 | .maxlen = sizeof(int), | |
889 | .mode = 0644, | |
890 | .proc_handler = &proc_dointvec, | |
891 | }, | |
892 | { | |
893 | .ctl_name = FS_DENTRY, | |
894 | .procname = "dentry-state", | |
895 | .data = &dentry_stat, | |
896 | .maxlen = 6*sizeof(int), | |
897 | .mode = 0444, | |
898 | .proc_handler = &proc_dointvec, | |
899 | }, | |
900 | { | |
901 | .ctl_name = FS_OVERFLOWUID, | |
902 | .procname = "overflowuid", | |
903 | .data = &fs_overflowuid, | |
904 | .maxlen = sizeof(int), | |
905 | .mode = 0644, | |
906 | .proc_handler = &proc_dointvec_minmax, | |
907 | .strategy = &sysctl_intvec, | |
908 | .extra1 = &minolduid, | |
909 | .extra2 = &maxolduid, | |
910 | }, | |
911 | { | |
912 | .ctl_name = FS_OVERFLOWGID, | |
913 | .procname = "overflowgid", | |
914 | .data = &fs_overflowgid, | |
915 | .maxlen = sizeof(int), | |
916 | .mode = 0644, | |
917 | .proc_handler = &proc_dointvec_minmax, | |
918 | .strategy = &sysctl_intvec, | |
919 | .extra1 = &minolduid, | |
920 | .extra2 = &maxolduid, | |
921 | }, | |
922 | { | |
923 | .ctl_name = FS_LEASES, | |
924 | .procname = "leases-enable", | |
925 | .data = &leases_enable, | |
926 | .maxlen = sizeof(int), | |
927 | .mode = 0644, | |
928 | .proc_handler = &proc_dointvec, | |
929 | }, | |
930 | #ifdef CONFIG_DNOTIFY | |
931 | { | |
932 | .ctl_name = FS_DIR_NOTIFY, | |
933 | .procname = "dir-notify-enable", | |
934 | .data = &dir_notify_enable, | |
935 | .maxlen = sizeof(int), | |
936 | .mode = 0644, | |
937 | .proc_handler = &proc_dointvec, | |
938 | }, | |
939 | #endif | |
940 | #ifdef CONFIG_MMU | |
941 | { | |
942 | .ctl_name = FS_LEASE_TIME, | |
943 | .procname = "lease-break-time", | |
944 | .data = &lease_break_time, | |
945 | .maxlen = sizeof(int), | |
946 | .mode = 0644, | |
947 | .proc_handler = &proc_dointvec, | |
948 | }, | |
949 | { | |
950 | .ctl_name = FS_AIO_NR, | |
951 | .procname = "aio-nr", | |
952 | .data = &aio_nr, | |
953 | .maxlen = sizeof(aio_nr), | |
954 | .mode = 0444, | |
955 | .proc_handler = &proc_dointvec, | |
956 | }, | |
957 | { | |
958 | .ctl_name = FS_AIO_MAX_NR, | |
959 | .procname = "aio-max-nr", | |
960 | .data = &aio_max_nr, | |
961 | .maxlen = sizeof(aio_max_nr), | |
962 | .mode = 0644, | |
963 | .proc_handler = &proc_dointvec, | |
964 | }, | |
0399cb08 RL |
965 | #ifdef CONFIG_INOTIFY |
966 | { | |
967 | .ctl_name = FS_INOTIFY, | |
968 | .procname = "inotify", | |
969 | .mode = 0555, | |
970 | .child = inotify_table, | |
971 | }, | |
972 | #endif | |
1da177e4 | 973 | #endif |
d6e71144 AC |
974 | { |
975 | .ctl_name = KERN_SETUID_DUMPABLE, | |
976 | .procname = "suid_dumpable", | |
977 | .data = &suid_dumpable, | |
978 | .maxlen = sizeof(int), | |
979 | .mode = 0644, | |
980 | .proc_handler = &proc_dointvec, | |
981 | }, | |
1da177e4 LT |
982 | { .ctl_name = 0 } |
983 | }; | |
984 | ||
985 | static ctl_table debug_table[] = { | |
986 | { .ctl_name = 0 } | |
987 | }; | |
988 | ||
989 | static ctl_table dev_table[] = { | |
990 | { .ctl_name = 0 } | |
0eeca283 | 991 | }; |
1da177e4 LT |
992 | |
993 | extern void init_irq_proc (void); | |
994 | ||
995 | void __init sysctl_init(void) | |
996 | { | |
997 | #ifdef CONFIG_PROC_FS | |
998 | register_proc_table(root_table, proc_sys_root); | |
999 | init_irq_proc(); | |
1000 | #endif | |
1001 | } | |
1002 | ||
1003 | int do_sysctl(int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp, | |
1004 | void __user *newval, size_t newlen) | |
1005 | { | |
1006 | struct list_head *tmp; | |
1007 | ||
1008 | if (nlen <= 0 || nlen >= CTL_MAXNAME) | |
1009 | return -ENOTDIR; | |
1010 | if (oldval) { | |
1011 | int old_len; | |
1012 | if (!oldlenp || get_user(old_len, oldlenp)) | |
1013 | return -EFAULT; | |
1014 | } | |
1015 | tmp = &root_table_header.ctl_entry; | |
1016 | do { | |
1017 | struct ctl_table_header *head = | |
1018 | list_entry(tmp, struct ctl_table_header, ctl_entry); | |
1019 | void *context = NULL; | |
1020 | int error = parse_table(name, nlen, oldval, oldlenp, | |
1021 | newval, newlen, head->ctl_table, | |
1022 | &context); | |
5a6b454f | 1023 | kfree(context); |
1da177e4 LT |
1024 | if (error != -ENOTDIR) |
1025 | return error; | |
1026 | tmp = tmp->next; | |
1027 | } while (tmp != &root_table_header.ctl_entry); | |
1028 | return -ENOTDIR; | |
1029 | } | |
1030 | ||
1031 | asmlinkage long sys_sysctl(struct __sysctl_args __user *args) | |
1032 | { | |
1033 | struct __sysctl_args tmp; | |
1034 | int error; | |
1035 | ||
1036 | if (copy_from_user(&tmp, args, sizeof(tmp))) | |
1037 | return -EFAULT; | |
1038 | ||
1039 | lock_kernel(); | |
1040 | error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp, | |
1041 | tmp.newval, tmp.newlen); | |
1042 | unlock_kernel(); | |
1043 | return error; | |
1044 | } | |
1045 | ||
1046 | /* | |
1047 | * ctl_perm does NOT grant the superuser all rights automatically, because | |
1048 | * some sysctl variables are readonly even to root. | |
1049 | */ | |
1050 | ||
1051 | static int test_perm(int mode, int op) | |
1052 | { | |
1053 | if (!current->euid) | |
1054 | mode >>= 6; | |
1055 | else if (in_egroup_p(0)) | |
1056 | mode >>= 3; | |
1057 | if ((mode & op & 0007) == op) | |
1058 | return 0; | |
1059 | return -EACCES; | |
1060 | } | |
1061 | ||
1062 | static inline int ctl_perm(ctl_table *table, int op) | |
1063 | { | |
1064 | int error; | |
1065 | error = security_sysctl(table, op); | |
1066 | if (error) | |
1067 | return error; | |
1068 | return test_perm(table->mode, op); | |
1069 | } | |
1070 | ||
1071 | static int parse_table(int __user *name, int nlen, | |
1072 | void __user *oldval, size_t __user *oldlenp, | |
1073 | void __user *newval, size_t newlen, | |
1074 | ctl_table *table, void **context) | |
1075 | { | |
1076 | int n; | |
1077 | repeat: | |
1078 | if (!nlen) | |
1079 | return -ENOTDIR; | |
1080 | if (get_user(n, name)) | |
1081 | return -EFAULT; | |
1082 | for ( ; table->ctl_name; table++) { | |
1083 | if (n == table->ctl_name || table->ctl_name == CTL_ANY) { | |
1084 | int error; | |
1085 | if (table->child) { | |
1086 | if (ctl_perm(table, 001)) | |
1087 | return -EPERM; | |
1088 | if (table->strategy) { | |
1089 | error = table->strategy( | |
1090 | table, name, nlen, | |
1091 | oldval, oldlenp, | |
1092 | newval, newlen, context); | |
1093 | if (error) | |
1094 | return error; | |
1095 | } | |
1096 | name++; | |
1097 | nlen--; | |
1098 | table = table->child; | |
1099 | goto repeat; | |
1100 | } | |
1101 | error = do_sysctl_strategy(table, name, nlen, | |
1102 | oldval, oldlenp, | |
1103 | newval, newlen, context); | |
1104 | return error; | |
1105 | } | |
1106 | } | |
1107 | return -ENOTDIR; | |
1108 | } | |
1109 | ||
1110 | /* Perform the actual read/write of a sysctl table entry. */ | |
1111 | int do_sysctl_strategy (ctl_table *table, | |
1112 | int __user *name, int nlen, | |
1113 | void __user *oldval, size_t __user *oldlenp, | |
1114 | void __user *newval, size_t newlen, void **context) | |
1115 | { | |
1116 | int op = 0, rc; | |
1117 | size_t len; | |
1118 | ||
1119 | if (oldval) | |
1120 | op |= 004; | |
1121 | if (newval) | |
1122 | op |= 002; | |
1123 | if (ctl_perm(table, op)) | |
1124 | return -EPERM; | |
1125 | ||
1126 | if (table->strategy) { | |
1127 | rc = table->strategy(table, name, nlen, oldval, oldlenp, | |
1128 | newval, newlen, context); | |
1129 | if (rc < 0) | |
1130 | return rc; | |
1131 | if (rc > 0) | |
1132 | return 0; | |
1133 | } | |
1134 | ||
1135 | /* If there is no strategy routine, or if the strategy returns | |
1136 | * zero, proceed with automatic r/w */ | |
1137 | if (table->data && table->maxlen) { | |
1138 | if (oldval && oldlenp) { | |
1139 | if (get_user(len, oldlenp)) | |
1140 | return -EFAULT; | |
1141 | if (len) { | |
1142 | if (len > table->maxlen) | |
1143 | len = table->maxlen; | |
1144 | if(copy_to_user(oldval, table->data, len)) | |
1145 | return -EFAULT; | |
1146 | if(put_user(len, oldlenp)) | |
1147 | return -EFAULT; | |
1148 | } | |
1149 | } | |
1150 | if (newval && newlen) { | |
1151 | len = newlen; | |
1152 | if (len > table->maxlen) | |
1153 | len = table->maxlen; | |
1154 | if(copy_from_user(table->data, newval, len)) | |
1155 | return -EFAULT; | |
1156 | } | |
1157 | } | |
1158 | return 0; | |
1159 | } | |
1160 | ||
1161 | /** | |
1162 | * register_sysctl_table - register a sysctl hierarchy | |
1163 | * @table: the top-level table structure | |
1164 | * @insert_at_head: whether the entry should be inserted in front or at the end | |
1165 | * | |
1166 | * Register a sysctl table hierarchy. @table should be a filled in ctl_table | |
1167 | * array. An entry with a ctl_name of 0 terminates the table. | |
1168 | * | |
1169 | * The members of the &ctl_table structure are used as follows: | |
1170 | * | |
1171 | * ctl_name - This is the numeric sysctl value used by sysctl(2). The number | |
1172 | * must be unique within that level of sysctl | |
1173 | * | |
1174 | * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not | |
1175 | * enter a sysctl file | |
1176 | * | |
1177 | * data - a pointer to data for use by proc_handler | |
1178 | * | |
1179 | * maxlen - the maximum size in bytes of the data | |
1180 | * | |
1181 | * mode - the file permissions for the /proc/sys file, and for sysctl(2) | |
1182 | * | |
1183 | * child - a pointer to the child sysctl table if this entry is a directory, or | |
1184 | * %NULL. | |
1185 | * | |
1186 | * proc_handler - the text handler routine (described below) | |
1187 | * | |
1188 | * strategy - the strategy routine (described below) | |
1189 | * | |
1190 | * de - for internal use by the sysctl routines | |
1191 | * | |
1192 | * extra1, extra2 - extra pointers usable by the proc handler routines | |
1193 | * | |
1194 | * Leaf nodes in the sysctl tree will be represented by a single file | |
1195 | * under /proc; non-leaf nodes will be represented by directories. | |
1196 | * | |
1197 | * sysctl(2) can automatically manage read and write requests through | |
1198 | * the sysctl table. The data and maxlen fields of the ctl_table | |
1199 | * struct enable minimal validation of the values being written to be | |
1200 | * performed, and the mode field allows minimal authentication. | |
1201 | * | |
1202 | * More sophisticated management can be enabled by the provision of a | |
1203 | * strategy routine with the table entry. This will be called before | |
1204 | * any automatic read or write of the data is performed. | |
1205 | * | |
1206 | * The strategy routine may return | |
1207 | * | |
1208 | * < 0 - Error occurred (error is passed to user process) | |
1209 | * | |
1210 | * 0 - OK - proceed with automatic read or write. | |
1211 | * | |
1212 | * > 0 - OK - read or write has been done by the strategy routine, so | |
1213 | * return immediately. | |
1214 | * | |
1215 | * There must be a proc_handler routine for any terminal nodes | |
1216 | * mirrored under /proc/sys (non-terminals are handled by a built-in | |
1217 | * directory handler). Several default handlers are available to | |
1218 | * cover common cases - | |
1219 | * | |
1220 | * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(), | |
1221 | * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(), | |
1222 | * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax() | |
1223 | * | |
1224 | * It is the handler's job to read the input buffer from user memory | |
1225 | * and process it. The handler should return 0 on success. | |
1226 | * | |
1227 | * This routine returns %NULL on a failure to register, and a pointer | |
1228 | * to the table header on success. | |
1229 | */ | |
1230 | struct ctl_table_header *register_sysctl_table(ctl_table * table, | |
1231 | int insert_at_head) | |
1232 | { | |
1233 | struct ctl_table_header *tmp; | |
1234 | tmp = kmalloc(sizeof(struct ctl_table_header), GFP_KERNEL); | |
1235 | if (!tmp) | |
1236 | return NULL; | |
1237 | tmp->ctl_table = table; | |
1238 | INIT_LIST_HEAD(&tmp->ctl_entry); | |
1239 | if (insert_at_head) | |
1240 | list_add(&tmp->ctl_entry, &root_table_header.ctl_entry); | |
1241 | else | |
1242 | list_add_tail(&tmp->ctl_entry, &root_table_header.ctl_entry); | |
1243 | #ifdef CONFIG_PROC_FS | |
1244 | register_proc_table(table, proc_sys_root); | |
1245 | #endif | |
1246 | return tmp; | |
1247 | } | |
1248 | ||
1249 | /** | |
1250 | * unregister_sysctl_table - unregister a sysctl table hierarchy | |
1251 | * @header: the header returned from register_sysctl_table | |
1252 | * | |
1253 | * Unregisters the sysctl table and all children. proc entries may not | |
1254 | * actually be removed until they are no longer used by anyone. | |
1255 | */ | |
1256 | void unregister_sysctl_table(struct ctl_table_header * header) | |
1257 | { | |
1258 | list_del(&header->ctl_entry); | |
1259 | #ifdef CONFIG_PROC_FS | |
1260 | unregister_proc_table(header->ctl_table, proc_sys_root); | |
1261 | #endif | |
1262 | kfree(header); | |
1263 | } | |
1264 | ||
1265 | /* | |
1266 | * /proc/sys support | |
1267 | */ | |
1268 | ||
1269 | #ifdef CONFIG_PROC_FS | |
1270 | ||
1271 | /* Scan the sysctl entries in table and add them all into /proc */ | |
1272 | static void register_proc_table(ctl_table * table, struct proc_dir_entry *root) | |
1273 | { | |
1274 | struct proc_dir_entry *de; | |
1275 | int len; | |
1276 | mode_t mode; | |
1277 | ||
1278 | for (; table->ctl_name; table++) { | |
1279 | /* Can't do anything without a proc name. */ | |
1280 | if (!table->procname) | |
1281 | continue; | |
1282 | /* Maybe we can't do anything with it... */ | |
1283 | if (!table->proc_handler && !table->child) { | |
1284 | printk(KERN_WARNING "SYSCTL: Can't register %s\n", | |
1285 | table->procname); | |
1286 | continue; | |
1287 | } | |
1288 | ||
1289 | len = strlen(table->procname); | |
1290 | mode = table->mode; | |
1291 | ||
1292 | de = NULL; | |
1293 | if (table->proc_handler) | |
1294 | mode |= S_IFREG; | |
1295 | else { | |
1296 | mode |= S_IFDIR; | |
1297 | for (de = root->subdir; de; de = de->next) { | |
1298 | if (proc_match(len, table->procname, de)) | |
1299 | break; | |
1300 | } | |
1301 | /* If the subdir exists already, de is non-NULL */ | |
1302 | } | |
1303 | ||
1304 | if (!de) { | |
1305 | de = create_proc_entry(table->procname, mode, root); | |
1306 | if (!de) | |
1307 | continue; | |
1308 | de->data = (void *) table; | |
1309 | if (table->proc_handler) | |
1310 | de->proc_fops = &proc_sys_file_operations; | |
1311 | } | |
1312 | table->de = de; | |
1313 | if (de->mode & S_IFDIR) | |
1314 | register_proc_table(table->child, de); | |
1315 | } | |
1316 | } | |
1317 | ||
1318 | /* | |
1319 | * Unregister a /proc sysctl table and any subdirectories. | |
1320 | */ | |
1321 | static void unregister_proc_table(ctl_table * table, struct proc_dir_entry *root) | |
1322 | { | |
1323 | struct proc_dir_entry *de; | |
1324 | for (; table->ctl_name; table++) { | |
1325 | if (!(de = table->de)) | |
1326 | continue; | |
1327 | if (de->mode & S_IFDIR) { | |
1328 | if (!table->child) { | |
1329 | printk (KERN_ALERT "Help - malformed sysctl tree on free\n"); | |
1330 | continue; | |
1331 | } | |
1332 | unregister_proc_table(table->child, de); | |
1333 | ||
1334 | /* Don't unregister directories which still have entries.. */ | |
1335 | if (de->subdir) | |
1336 | continue; | |
1337 | } | |
1338 | ||
1339 | /* Don't unregister proc entries that are still being used.. */ | |
1340 | if (atomic_read(&de->count)) | |
1341 | continue; | |
1342 | ||
1343 | table->de = NULL; | |
1344 | remove_proc_entry(table->procname, root); | |
1345 | } | |
1346 | } | |
1347 | ||
1348 | static ssize_t do_rw_proc(int write, struct file * file, char __user * buf, | |
1349 | size_t count, loff_t *ppos) | |
1350 | { | |
1351 | int op; | |
1352 | struct proc_dir_entry *de; | |
1353 | struct ctl_table *table; | |
1354 | size_t res; | |
1355 | ssize_t error; | |
1356 | ||
1357 | de = PDE(file->f_dentry->d_inode); | |
1358 | if (!de || !de->data) | |
1359 | return -ENOTDIR; | |
1360 | table = (struct ctl_table *) de->data; | |
1361 | if (!table || !table->proc_handler) | |
1362 | return -ENOTDIR; | |
1363 | op = (write ? 002 : 004); | |
1364 | if (ctl_perm(table, op)) | |
1365 | return -EPERM; | |
1366 | ||
1367 | res = count; | |
1368 | ||
1369 | error = (*table->proc_handler) (table, write, file, buf, &res, ppos); | |
1370 | if (error) | |
1371 | return error; | |
1372 | return res; | |
1373 | } | |
1374 | ||
1375 | static int proc_opensys(struct inode *inode, struct file *file) | |
1376 | { | |
1377 | if (file->f_mode & FMODE_WRITE) { | |
1378 | /* | |
1379 | * sysctl entries that are not writable, | |
1380 | * are _NOT_ writable, capabilities or not. | |
1381 | */ | |
1382 | if (!(inode->i_mode & S_IWUSR)) | |
1383 | return -EPERM; | |
1384 | } | |
1385 | ||
1386 | return 0; | |
1387 | } | |
1388 | ||
1389 | static ssize_t proc_readsys(struct file * file, char __user * buf, | |
1390 | size_t count, loff_t *ppos) | |
1391 | { | |
1392 | return do_rw_proc(0, file, buf, count, ppos); | |
1393 | } | |
1394 | ||
1395 | static ssize_t proc_writesys(struct file * file, const char __user * buf, | |
1396 | size_t count, loff_t *ppos) | |
1397 | { | |
1398 | return do_rw_proc(1, file, (char __user *) buf, count, ppos); | |
1399 | } | |
1400 | ||
1401 | /** | |
1402 | * proc_dostring - read a string sysctl | |
1403 | * @table: the sysctl table | |
1404 | * @write: %TRUE if this is a write to the sysctl file | |
1405 | * @filp: the file structure | |
1406 | * @buffer: the user buffer | |
1407 | * @lenp: the size of the user buffer | |
1408 | * @ppos: file position | |
1409 | * | |
1410 | * Reads/writes a string from/to the user buffer. If the kernel | |
1411 | * buffer provided is not large enough to hold the string, the | |
1412 | * string is truncated. The copied string is %NULL-terminated. | |
1413 | * If the string is being read by the user process, it is copied | |
1414 | * and a newline '\n' is added. It is truncated if the buffer is | |
1415 | * not large enough. | |
1416 | * | |
1417 | * Returns 0 on success. | |
1418 | */ | |
1419 | int proc_dostring(ctl_table *table, int write, struct file *filp, | |
1420 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
1421 | { | |
1422 | size_t len; | |
1423 | char __user *p; | |
1424 | char c; | |
1425 | ||
1426 | if (!table->data || !table->maxlen || !*lenp || | |
1427 | (*ppos && !write)) { | |
1428 | *lenp = 0; | |
1429 | return 0; | |
1430 | } | |
1431 | ||
1432 | if (write) { | |
1433 | len = 0; | |
1434 | p = buffer; | |
1435 | while (len < *lenp) { | |
1436 | if (get_user(c, p++)) | |
1437 | return -EFAULT; | |
1438 | if (c == 0 || c == '\n') | |
1439 | break; | |
1440 | len++; | |
1441 | } | |
1442 | if (len >= table->maxlen) | |
1443 | len = table->maxlen-1; | |
1444 | if(copy_from_user(table->data, buffer, len)) | |
1445 | return -EFAULT; | |
1446 | ((char *) table->data)[len] = 0; | |
1447 | *ppos += *lenp; | |
1448 | } else { | |
1449 | len = strlen(table->data); | |
1450 | if (len > table->maxlen) | |
1451 | len = table->maxlen; | |
1452 | if (len > *lenp) | |
1453 | len = *lenp; | |
1454 | if (len) | |
1455 | if(copy_to_user(buffer, table->data, len)) | |
1456 | return -EFAULT; | |
1457 | if (len < *lenp) { | |
1458 | if(put_user('\n', ((char __user *) buffer) + len)) | |
1459 | return -EFAULT; | |
1460 | len++; | |
1461 | } | |
1462 | *lenp = len; | |
1463 | *ppos += len; | |
1464 | } | |
1465 | return 0; | |
1466 | } | |
1467 | ||
1468 | /* | |
1469 | * Special case of dostring for the UTS structure. This has locks | |
1470 | * to observe. Should this be in kernel/sys.c ???? | |
1471 | */ | |
1472 | ||
1473 | static int proc_doutsstring(ctl_table *table, int write, struct file *filp, | |
1474 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
1475 | { | |
1476 | int r; | |
1477 | ||
1478 | if (!write) { | |
1479 | down_read(&uts_sem); | |
1480 | r=proc_dostring(table,0,filp,buffer,lenp, ppos); | |
1481 | up_read(&uts_sem); | |
1482 | } else { | |
1483 | down_write(&uts_sem); | |
1484 | r=proc_dostring(table,1,filp,buffer,lenp, ppos); | |
1485 | up_write(&uts_sem); | |
1486 | } | |
1487 | return r; | |
1488 | } | |
1489 | ||
1490 | static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp, | |
1491 | int *valp, | |
1492 | int write, void *data) | |
1493 | { | |
1494 | if (write) { | |
1495 | *valp = *negp ? -*lvalp : *lvalp; | |
1496 | } else { | |
1497 | int val = *valp; | |
1498 | if (val < 0) { | |
1499 | *negp = -1; | |
1500 | *lvalp = (unsigned long)-val; | |
1501 | } else { | |
1502 | *negp = 0; | |
1503 | *lvalp = (unsigned long)val; | |
1504 | } | |
1505 | } | |
1506 | return 0; | |
1507 | } | |
1508 | ||
1509 | static int do_proc_dointvec(ctl_table *table, int write, struct file *filp, | |
1510 | void __user *buffer, size_t *lenp, loff_t *ppos, | |
1511 | int (*conv)(int *negp, unsigned long *lvalp, int *valp, | |
1512 | int write, void *data), | |
1513 | void *data) | |
1514 | { | |
1515 | #define TMPBUFLEN 21 | |
1516 | int *i, vleft, first=1, neg, val; | |
1517 | unsigned long lval; | |
1518 | size_t left, len; | |
1519 | ||
1520 | char buf[TMPBUFLEN], *p; | |
1521 | char __user *s = buffer; | |
1522 | ||
1523 | if (!table->data || !table->maxlen || !*lenp || | |
1524 | (*ppos && !write)) { | |
1525 | *lenp = 0; | |
1526 | return 0; | |
1527 | } | |
1528 | ||
1529 | i = (int *) table->data; | |
1530 | vleft = table->maxlen / sizeof(*i); | |
1531 | left = *lenp; | |
1532 | ||
1533 | if (!conv) | |
1534 | conv = do_proc_dointvec_conv; | |
1535 | ||
1536 | for (; left && vleft--; i++, first=0) { | |
1537 | if (write) { | |
1538 | while (left) { | |
1539 | char c; | |
1540 | if (get_user(c, s)) | |
1541 | return -EFAULT; | |
1542 | if (!isspace(c)) | |
1543 | break; | |
1544 | left--; | |
1545 | s++; | |
1546 | } | |
1547 | if (!left) | |
1548 | break; | |
1549 | neg = 0; | |
1550 | len = left; | |
1551 | if (len > sizeof(buf) - 1) | |
1552 | len = sizeof(buf) - 1; | |
1553 | if (copy_from_user(buf, s, len)) | |
1554 | return -EFAULT; | |
1555 | buf[len] = 0; | |
1556 | p = buf; | |
1557 | if (*p == '-' && left > 1) { | |
1558 | neg = 1; | |
1559 | left--, p++; | |
1560 | } | |
1561 | if (*p < '0' || *p > '9') | |
1562 | break; | |
1563 | ||
1564 | lval = simple_strtoul(p, &p, 0); | |
1565 | ||
1566 | len = p-buf; | |
1567 | if ((len < left) && *p && !isspace(*p)) | |
1568 | break; | |
1569 | if (neg) | |
1570 | val = -val; | |
1571 | s += len; | |
1572 | left -= len; | |
1573 | ||
1574 | if (conv(&neg, &lval, i, 1, data)) | |
1575 | break; | |
1576 | } else { | |
1577 | p = buf; | |
1578 | if (!first) | |
1579 | *p++ = '\t'; | |
1580 | ||
1581 | if (conv(&neg, &lval, i, 0, data)) | |
1582 | break; | |
1583 | ||
1584 | sprintf(p, "%s%lu", neg ? "-" : "", lval); | |
1585 | len = strlen(buf); | |
1586 | if (len > left) | |
1587 | len = left; | |
1588 | if(copy_to_user(s, buf, len)) | |
1589 | return -EFAULT; | |
1590 | left -= len; | |
1591 | s += len; | |
1592 | } | |
1593 | } | |
1594 | ||
1595 | if (!write && !first && left) { | |
1596 | if(put_user('\n', s)) | |
1597 | return -EFAULT; | |
1598 | left--, s++; | |
1599 | } | |
1600 | if (write) { | |
1601 | while (left) { | |
1602 | char c; | |
1603 | if (get_user(c, s++)) | |
1604 | return -EFAULT; | |
1605 | if (!isspace(c)) | |
1606 | break; | |
1607 | left--; | |
1608 | } | |
1609 | } | |
1610 | if (write && first) | |
1611 | return -EINVAL; | |
1612 | *lenp -= left; | |
1613 | *ppos += *lenp; | |
1614 | return 0; | |
1615 | #undef TMPBUFLEN | |
1616 | } | |
1617 | ||
1618 | /** | |
1619 | * proc_dointvec - read a vector of integers | |
1620 | * @table: the sysctl table | |
1621 | * @write: %TRUE if this is a write to the sysctl file | |
1622 | * @filp: the file structure | |
1623 | * @buffer: the user buffer | |
1624 | * @lenp: the size of the user buffer | |
1625 | * @ppos: file position | |
1626 | * | |
1627 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer | |
1628 | * values from/to the user buffer, treated as an ASCII string. | |
1629 | * | |
1630 | * Returns 0 on success. | |
1631 | */ | |
1632 | int proc_dointvec(ctl_table *table, int write, struct file *filp, | |
1633 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
1634 | { | |
1635 | return do_proc_dointvec(table,write,filp,buffer,lenp,ppos, | |
1636 | NULL,NULL); | |
1637 | } | |
1638 | ||
1639 | #define OP_SET 0 | |
1640 | #define OP_AND 1 | |
1641 | #define OP_OR 2 | |
1642 | #define OP_MAX 3 | |
1643 | #define OP_MIN 4 | |
1644 | ||
1645 | static int do_proc_dointvec_bset_conv(int *negp, unsigned long *lvalp, | |
1646 | int *valp, | |
1647 | int write, void *data) | |
1648 | { | |
1649 | int op = *(int *)data; | |
1650 | if (write) { | |
1651 | int val = *negp ? -*lvalp : *lvalp; | |
1652 | switch(op) { | |
1653 | case OP_SET: *valp = val; break; | |
1654 | case OP_AND: *valp &= val; break; | |
1655 | case OP_OR: *valp |= val; break; | |
1656 | case OP_MAX: if(*valp < val) | |
1657 | *valp = val; | |
1658 | break; | |
1659 | case OP_MIN: if(*valp > val) | |
1660 | *valp = val; | |
1661 | break; | |
1662 | } | |
1663 | } else { | |
1664 | int val = *valp; | |
1665 | if (val < 0) { | |
1666 | *negp = -1; | |
1667 | *lvalp = (unsigned long)-val; | |
1668 | } else { | |
1669 | *negp = 0; | |
1670 | *lvalp = (unsigned long)val; | |
1671 | } | |
1672 | } | |
1673 | return 0; | |
1674 | } | |
1675 | ||
1676 | /* | |
1677 | * init may raise the set. | |
1678 | */ | |
1679 | ||
1680 | int proc_dointvec_bset(ctl_table *table, int write, struct file *filp, | |
1681 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
1682 | { | |
1683 | int op; | |
1684 | ||
1685 | if (!capable(CAP_SYS_MODULE)) { | |
1686 | return -EPERM; | |
1687 | } | |
1688 | ||
1689 | op = (current->pid == 1) ? OP_SET : OP_AND; | |
1690 | return do_proc_dointvec(table,write,filp,buffer,lenp,ppos, | |
1691 | do_proc_dointvec_bset_conv,&op); | |
1692 | } | |
1693 | ||
1694 | struct do_proc_dointvec_minmax_conv_param { | |
1695 | int *min; | |
1696 | int *max; | |
1697 | }; | |
1698 | ||
1699 | static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp, | |
1700 | int *valp, | |
1701 | int write, void *data) | |
1702 | { | |
1703 | struct do_proc_dointvec_minmax_conv_param *param = data; | |
1704 | if (write) { | |
1705 | int val = *negp ? -*lvalp : *lvalp; | |
1706 | if ((param->min && *param->min > val) || | |
1707 | (param->max && *param->max < val)) | |
1708 | return -EINVAL; | |
1709 | *valp = val; | |
1710 | } else { | |
1711 | int val = *valp; | |
1712 | if (val < 0) { | |
1713 | *negp = -1; | |
1714 | *lvalp = (unsigned long)-val; | |
1715 | } else { | |
1716 | *negp = 0; | |
1717 | *lvalp = (unsigned long)val; | |
1718 | } | |
1719 | } | |
1720 | return 0; | |
1721 | } | |
1722 | ||
1723 | /** | |
1724 | * proc_dointvec_minmax - read a vector of integers with min/max values | |
1725 | * @table: the sysctl table | |
1726 | * @write: %TRUE if this is a write to the sysctl file | |
1727 | * @filp: the file structure | |
1728 | * @buffer: the user buffer | |
1729 | * @lenp: the size of the user buffer | |
1730 | * @ppos: file position | |
1731 | * | |
1732 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer | |
1733 | * values from/to the user buffer, treated as an ASCII string. | |
1734 | * | |
1735 | * This routine will ensure the values are within the range specified by | |
1736 | * table->extra1 (min) and table->extra2 (max). | |
1737 | * | |
1738 | * Returns 0 on success. | |
1739 | */ | |
1740 | int proc_dointvec_minmax(ctl_table *table, int write, struct file *filp, | |
1741 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
1742 | { | |
1743 | struct do_proc_dointvec_minmax_conv_param param = { | |
1744 | .min = (int *) table->extra1, | |
1745 | .max = (int *) table->extra2, | |
1746 | }; | |
1747 | return do_proc_dointvec(table, write, filp, buffer, lenp, ppos, | |
1748 | do_proc_dointvec_minmax_conv, ¶m); | |
1749 | } | |
1750 | ||
1751 | static int do_proc_doulongvec_minmax(ctl_table *table, int write, | |
1752 | struct file *filp, | |
1753 | void __user *buffer, | |
1754 | size_t *lenp, loff_t *ppos, | |
1755 | unsigned long convmul, | |
1756 | unsigned long convdiv) | |
1757 | { | |
1758 | #define TMPBUFLEN 21 | |
1759 | unsigned long *i, *min, *max, val; | |
1760 | int vleft, first=1, neg; | |
1761 | size_t len, left; | |
1762 | char buf[TMPBUFLEN], *p; | |
1763 | char __user *s = buffer; | |
1764 | ||
1765 | if (!table->data || !table->maxlen || !*lenp || | |
1766 | (*ppos && !write)) { | |
1767 | *lenp = 0; | |
1768 | return 0; | |
1769 | } | |
1770 | ||
1771 | i = (unsigned long *) table->data; | |
1772 | min = (unsigned long *) table->extra1; | |
1773 | max = (unsigned long *) table->extra2; | |
1774 | vleft = table->maxlen / sizeof(unsigned long); | |
1775 | left = *lenp; | |
1776 | ||
1777 | for (; left && vleft--; i++, min++, max++, first=0) { | |
1778 | if (write) { | |
1779 | while (left) { | |
1780 | char c; | |
1781 | if (get_user(c, s)) | |
1782 | return -EFAULT; | |
1783 | if (!isspace(c)) | |
1784 | break; | |
1785 | left--; | |
1786 | s++; | |
1787 | } | |
1788 | if (!left) | |
1789 | break; | |
1790 | neg = 0; | |
1791 | len = left; | |
1792 | if (len > TMPBUFLEN-1) | |
1793 | len = TMPBUFLEN-1; | |
1794 | if (copy_from_user(buf, s, len)) | |
1795 | return -EFAULT; | |
1796 | buf[len] = 0; | |
1797 | p = buf; | |
1798 | if (*p == '-' && left > 1) { | |
1799 | neg = 1; | |
1800 | left--, p++; | |
1801 | } | |
1802 | if (*p < '0' || *p > '9') | |
1803 | break; | |
1804 | val = simple_strtoul(p, &p, 0) * convmul / convdiv ; | |
1805 | len = p-buf; | |
1806 | if ((len < left) && *p && !isspace(*p)) | |
1807 | break; | |
1808 | if (neg) | |
1809 | val = -val; | |
1810 | s += len; | |
1811 | left -= len; | |
1812 | ||
1813 | if(neg) | |
1814 | continue; | |
1815 | if ((min && val < *min) || (max && val > *max)) | |
1816 | continue; | |
1817 | *i = val; | |
1818 | } else { | |
1819 | p = buf; | |
1820 | if (!first) | |
1821 | *p++ = '\t'; | |
1822 | sprintf(p, "%lu", convdiv * (*i) / convmul); | |
1823 | len = strlen(buf); | |
1824 | if (len > left) | |
1825 | len = left; | |
1826 | if(copy_to_user(s, buf, len)) | |
1827 | return -EFAULT; | |
1828 | left -= len; | |
1829 | s += len; | |
1830 | } | |
1831 | } | |
1832 | ||
1833 | if (!write && !first && left) { | |
1834 | if(put_user('\n', s)) | |
1835 | return -EFAULT; | |
1836 | left--, s++; | |
1837 | } | |
1838 | if (write) { | |
1839 | while (left) { | |
1840 | char c; | |
1841 | if (get_user(c, s++)) | |
1842 | return -EFAULT; | |
1843 | if (!isspace(c)) | |
1844 | break; | |
1845 | left--; | |
1846 | } | |
1847 | } | |
1848 | if (write && first) | |
1849 | return -EINVAL; | |
1850 | *lenp -= left; | |
1851 | *ppos += *lenp; | |
1852 | return 0; | |
1853 | #undef TMPBUFLEN | |
1854 | } | |
1855 | ||
1856 | /** | |
1857 | * proc_doulongvec_minmax - read a vector of long integers with min/max values | |
1858 | * @table: the sysctl table | |
1859 | * @write: %TRUE if this is a write to the sysctl file | |
1860 | * @filp: the file structure | |
1861 | * @buffer: the user buffer | |
1862 | * @lenp: the size of the user buffer | |
1863 | * @ppos: file position | |
1864 | * | |
1865 | * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long | |
1866 | * values from/to the user buffer, treated as an ASCII string. | |
1867 | * | |
1868 | * This routine will ensure the values are within the range specified by | |
1869 | * table->extra1 (min) and table->extra2 (max). | |
1870 | * | |
1871 | * Returns 0 on success. | |
1872 | */ | |
1873 | int proc_doulongvec_minmax(ctl_table *table, int write, struct file *filp, | |
1874 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
1875 | { | |
1876 | return do_proc_doulongvec_minmax(table, write, filp, buffer, lenp, ppos, 1l, 1l); | |
1877 | } | |
1878 | ||
1879 | /** | |
1880 | * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values | |
1881 | * @table: the sysctl table | |
1882 | * @write: %TRUE if this is a write to the sysctl file | |
1883 | * @filp: the file structure | |
1884 | * @buffer: the user buffer | |
1885 | * @lenp: the size of the user buffer | |
1886 | * @ppos: file position | |
1887 | * | |
1888 | * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long | |
1889 | * values from/to the user buffer, treated as an ASCII string. The values | |
1890 | * are treated as milliseconds, and converted to jiffies when they are stored. | |
1891 | * | |
1892 | * This routine will ensure the values are within the range specified by | |
1893 | * table->extra1 (min) and table->extra2 (max). | |
1894 | * | |
1895 | * Returns 0 on success. | |
1896 | */ | |
1897 | int proc_doulongvec_ms_jiffies_minmax(ctl_table *table, int write, | |
1898 | struct file *filp, | |
1899 | void __user *buffer, | |
1900 | size_t *lenp, loff_t *ppos) | |
1901 | { | |
1902 | return do_proc_doulongvec_minmax(table, write, filp, buffer, | |
1903 | lenp, ppos, HZ, 1000l); | |
1904 | } | |
1905 | ||
1906 | ||
1907 | static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp, | |
1908 | int *valp, | |
1909 | int write, void *data) | |
1910 | { | |
1911 | if (write) { | |
1912 | *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ); | |
1913 | } else { | |
1914 | int val = *valp; | |
1915 | unsigned long lval; | |
1916 | if (val < 0) { | |
1917 | *negp = -1; | |
1918 | lval = (unsigned long)-val; | |
1919 | } else { | |
1920 | *negp = 0; | |
1921 | lval = (unsigned long)val; | |
1922 | } | |
1923 | *lvalp = lval / HZ; | |
1924 | } | |
1925 | return 0; | |
1926 | } | |
1927 | ||
1928 | static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp, | |
1929 | int *valp, | |
1930 | int write, void *data) | |
1931 | { | |
1932 | if (write) { | |
1933 | *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp); | |
1934 | } else { | |
1935 | int val = *valp; | |
1936 | unsigned long lval; | |
1937 | if (val < 0) { | |
1938 | *negp = -1; | |
1939 | lval = (unsigned long)-val; | |
1940 | } else { | |
1941 | *negp = 0; | |
1942 | lval = (unsigned long)val; | |
1943 | } | |
1944 | *lvalp = jiffies_to_clock_t(lval); | |
1945 | } | |
1946 | return 0; | |
1947 | } | |
1948 | ||
1949 | static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp, | |
1950 | int *valp, | |
1951 | int write, void *data) | |
1952 | { | |
1953 | if (write) { | |
1954 | *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp); | |
1955 | } else { | |
1956 | int val = *valp; | |
1957 | unsigned long lval; | |
1958 | if (val < 0) { | |
1959 | *negp = -1; | |
1960 | lval = (unsigned long)-val; | |
1961 | } else { | |
1962 | *negp = 0; | |
1963 | lval = (unsigned long)val; | |
1964 | } | |
1965 | *lvalp = jiffies_to_msecs(lval); | |
1966 | } | |
1967 | return 0; | |
1968 | } | |
1969 | ||
1970 | /** | |
1971 | * proc_dointvec_jiffies - read a vector of integers as seconds | |
1972 | * @table: the sysctl table | |
1973 | * @write: %TRUE if this is a write to the sysctl file | |
1974 | * @filp: the file structure | |
1975 | * @buffer: the user buffer | |
1976 | * @lenp: the size of the user buffer | |
1977 | * @ppos: file position | |
1978 | * | |
1979 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer | |
1980 | * values from/to the user buffer, treated as an ASCII string. | |
1981 | * The values read are assumed to be in seconds, and are converted into | |
1982 | * jiffies. | |
1983 | * | |
1984 | * Returns 0 on success. | |
1985 | */ | |
1986 | int proc_dointvec_jiffies(ctl_table *table, int write, struct file *filp, | |
1987 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
1988 | { | |
1989 | return do_proc_dointvec(table,write,filp,buffer,lenp,ppos, | |
1990 | do_proc_dointvec_jiffies_conv,NULL); | |
1991 | } | |
1992 | ||
1993 | /** | |
1994 | * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds | |
1995 | * @table: the sysctl table | |
1996 | * @write: %TRUE if this is a write to the sysctl file | |
1997 | * @filp: the file structure | |
1998 | * @buffer: the user buffer | |
1999 | * @lenp: the size of the user buffer | |
2000 | * | |
2001 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer | |
2002 | * values from/to the user buffer, treated as an ASCII string. | |
2003 | * The values read are assumed to be in 1/USER_HZ seconds, and | |
2004 | * are converted into jiffies. | |
2005 | * | |
2006 | * Returns 0 on success. | |
2007 | */ | |
2008 | int proc_dointvec_userhz_jiffies(ctl_table *table, int write, struct file *filp, | |
2009 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2010 | { | |
2011 | return do_proc_dointvec(table,write,filp,buffer,lenp,ppos, | |
2012 | do_proc_dointvec_userhz_jiffies_conv,NULL); | |
2013 | } | |
2014 | ||
2015 | /** | |
2016 | * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds | |
2017 | * @table: the sysctl table | |
2018 | * @write: %TRUE if this is a write to the sysctl file | |
2019 | * @filp: the file structure | |
2020 | * @buffer: the user buffer | |
2021 | * @lenp: the size of the user buffer | |
67be2dd1 MW |
2022 | * @ppos: file position |
2023 | * @ppos: the current position in the file | |
1da177e4 LT |
2024 | * |
2025 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer | |
2026 | * values from/to the user buffer, treated as an ASCII string. | |
2027 | * The values read are assumed to be in 1/1000 seconds, and | |
2028 | * are converted into jiffies. | |
2029 | * | |
2030 | * Returns 0 on success. | |
2031 | */ | |
2032 | int proc_dointvec_ms_jiffies(ctl_table *table, int write, struct file *filp, | |
2033 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2034 | { | |
2035 | return do_proc_dointvec(table, write, filp, buffer, lenp, ppos, | |
2036 | do_proc_dointvec_ms_jiffies_conv, NULL); | |
2037 | } | |
2038 | ||
2039 | #else /* CONFIG_PROC_FS */ | |
2040 | ||
2041 | int proc_dostring(ctl_table *table, int write, struct file *filp, | |
2042 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2043 | { | |
2044 | return -ENOSYS; | |
2045 | } | |
2046 | ||
2047 | static int proc_doutsstring(ctl_table *table, int write, struct file *filp, | |
2048 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2049 | { | |
2050 | return -ENOSYS; | |
2051 | } | |
2052 | ||
2053 | int proc_dointvec(ctl_table *table, int write, struct file *filp, | |
2054 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2055 | { | |
2056 | return -ENOSYS; | |
2057 | } | |
2058 | ||
2059 | int proc_dointvec_bset(ctl_table *table, int write, struct file *filp, | |
2060 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2061 | { | |
2062 | return -ENOSYS; | |
2063 | } | |
2064 | ||
2065 | int proc_dointvec_minmax(ctl_table *table, int write, struct file *filp, | |
2066 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2067 | { | |
2068 | return -ENOSYS; | |
2069 | } | |
2070 | ||
2071 | int proc_dointvec_jiffies(ctl_table *table, int write, struct file *filp, | |
2072 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2073 | { | |
2074 | return -ENOSYS; | |
2075 | } | |
2076 | ||
2077 | int proc_dointvec_userhz_jiffies(ctl_table *table, int write, struct file *filp, | |
2078 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2079 | { | |
2080 | return -ENOSYS; | |
2081 | } | |
2082 | ||
2083 | int proc_dointvec_ms_jiffies(ctl_table *table, int write, struct file *filp, | |
2084 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2085 | { | |
2086 | return -ENOSYS; | |
2087 | } | |
2088 | ||
2089 | int proc_doulongvec_minmax(ctl_table *table, int write, struct file *filp, | |
2090 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2091 | { | |
2092 | return -ENOSYS; | |
2093 | } | |
2094 | ||
2095 | int proc_doulongvec_ms_jiffies_minmax(ctl_table *table, int write, | |
2096 | struct file *filp, | |
2097 | void __user *buffer, | |
2098 | size_t *lenp, loff_t *ppos) | |
2099 | { | |
2100 | return -ENOSYS; | |
2101 | } | |
2102 | ||
2103 | ||
2104 | #endif /* CONFIG_PROC_FS */ | |
2105 | ||
2106 | ||
2107 | /* | |
2108 | * General sysctl support routines | |
2109 | */ | |
2110 | ||
2111 | /* The generic string strategy routine: */ | |
2112 | int sysctl_string(ctl_table *table, int __user *name, int nlen, | |
2113 | void __user *oldval, size_t __user *oldlenp, | |
2114 | void __user *newval, size_t newlen, void **context) | |
2115 | { | |
2116 | size_t l, len; | |
2117 | ||
2118 | if (!table->data || !table->maxlen) | |
2119 | return -ENOTDIR; | |
2120 | ||
2121 | if (oldval && oldlenp) { | |
2122 | if (get_user(len, oldlenp)) | |
2123 | return -EFAULT; | |
2124 | if (len) { | |
2125 | l = strlen(table->data); | |
2126 | if (len > l) len = l; | |
2127 | if (len >= table->maxlen) | |
2128 | len = table->maxlen; | |
2129 | if(copy_to_user(oldval, table->data, len)) | |
2130 | return -EFAULT; | |
2131 | if(put_user(0, ((char __user *) oldval) + len)) | |
2132 | return -EFAULT; | |
2133 | if(put_user(len, oldlenp)) | |
2134 | return -EFAULT; | |
2135 | } | |
2136 | } | |
2137 | if (newval && newlen) { | |
2138 | len = newlen; | |
2139 | if (len > table->maxlen) | |
2140 | len = table->maxlen; | |
2141 | if(copy_from_user(table->data, newval, len)) | |
2142 | return -EFAULT; | |
2143 | if (len == table->maxlen) | |
2144 | len--; | |
2145 | ((char *) table->data)[len] = 0; | |
2146 | } | |
2147 | return 0; | |
2148 | } | |
2149 | ||
2150 | /* | |
2151 | * This function makes sure that all of the integers in the vector | |
2152 | * are between the minimum and maximum values given in the arrays | |
2153 | * table->extra1 and table->extra2, respectively. | |
2154 | */ | |
2155 | int sysctl_intvec(ctl_table *table, int __user *name, int nlen, | |
2156 | void __user *oldval, size_t __user *oldlenp, | |
2157 | void __user *newval, size_t newlen, void **context) | |
2158 | { | |
2159 | ||
2160 | if (newval && newlen) { | |
2161 | int __user *vec = (int __user *) newval; | |
2162 | int *min = (int *) table->extra1; | |
2163 | int *max = (int *) table->extra2; | |
2164 | size_t length; | |
2165 | int i; | |
2166 | ||
2167 | if (newlen % sizeof(int) != 0) | |
2168 | return -EINVAL; | |
2169 | ||
2170 | if (!table->extra1 && !table->extra2) | |
2171 | return 0; | |
2172 | ||
2173 | if (newlen > table->maxlen) | |
2174 | newlen = table->maxlen; | |
2175 | length = newlen / sizeof(int); | |
2176 | ||
2177 | for (i = 0; i < length; i++) { | |
2178 | int value; | |
2179 | if (get_user(value, vec + i)) | |
2180 | return -EFAULT; | |
2181 | if (min && value < min[i]) | |
2182 | return -EINVAL; | |
2183 | if (max && value > max[i]) | |
2184 | return -EINVAL; | |
2185 | } | |
2186 | } | |
2187 | return 0; | |
2188 | } | |
2189 | ||
2190 | /* Strategy function to convert jiffies to seconds */ | |
2191 | int sysctl_jiffies(ctl_table *table, int __user *name, int nlen, | |
2192 | void __user *oldval, size_t __user *oldlenp, | |
2193 | void __user *newval, size_t newlen, void **context) | |
2194 | { | |
2195 | if (oldval) { | |
2196 | size_t olen; | |
2197 | if (oldlenp) { | |
2198 | if (get_user(olen, oldlenp)) | |
2199 | return -EFAULT; | |
2200 | if (olen!=sizeof(int)) | |
2201 | return -EINVAL; | |
2202 | } | |
2203 | if (put_user(*(int *)(table->data)/HZ, (int __user *)oldval) || | |
2204 | (oldlenp && put_user(sizeof(int),oldlenp))) | |
2205 | return -EFAULT; | |
2206 | } | |
2207 | if (newval && newlen) { | |
2208 | int new; | |
2209 | if (newlen != sizeof(int)) | |
2210 | return -EINVAL; | |
2211 | if (get_user(new, (int __user *)newval)) | |
2212 | return -EFAULT; | |
2213 | *(int *)(table->data) = new*HZ; | |
2214 | } | |
2215 | return 1; | |
2216 | } | |
2217 | ||
2218 | /* Strategy function to convert jiffies to seconds */ | |
2219 | int sysctl_ms_jiffies(ctl_table *table, int __user *name, int nlen, | |
2220 | void __user *oldval, size_t __user *oldlenp, | |
2221 | void __user *newval, size_t newlen, void **context) | |
2222 | { | |
2223 | if (oldval) { | |
2224 | size_t olen; | |
2225 | if (oldlenp) { | |
2226 | if (get_user(olen, oldlenp)) | |
2227 | return -EFAULT; | |
2228 | if (olen!=sizeof(int)) | |
2229 | return -EINVAL; | |
2230 | } | |
2231 | if (put_user(jiffies_to_msecs(*(int *)(table->data)), (int __user *)oldval) || | |
2232 | (oldlenp && put_user(sizeof(int),oldlenp))) | |
2233 | return -EFAULT; | |
2234 | } | |
2235 | if (newval && newlen) { | |
2236 | int new; | |
2237 | if (newlen != sizeof(int)) | |
2238 | return -EINVAL; | |
2239 | if (get_user(new, (int __user *)newval)) | |
2240 | return -EFAULT; | |
2241 | *(int *)(table->data) = msecs_to_jiffies(new); | |
2242 | } | |
2243 | return 1; | |
2244 | } | |
2245 | ||
2246 | #else /* CONFIG_SYSCTL */ | |
2247 | ||
2248 | ||
2249 | asmlinkage long sys_sysctl(struct __sysctl_args __user *args) | |
2250 | { | |
2251 | return -ENOSYS; | |
2252 | } | |
2253 | ||
2254 | int sysctl_string(ctl_table *table, int __user *name, int nlen, | |
2255 | void __user *oldval, size_t __user *oldlenp, | |
2256 | void __user *newval, size_t newlen, void **context) | |
2257 | { | |
2258 | return -ENOSYS; | |
2259 | } | |
2260 | ||
2261 | int sysctl_intvec(ctl_table *table, int __user *name, int nlen, | |
2262 | void __user *oldval, size_t __user *oldlenp, | |
2263 | void __user *newval, size_t newlen, void **context) | |
2264 | { | |
2265 | return -ENOSYS; | |
2266 | } | |
2267 | ||
2268 | int sysctl_jiffies(ctl_table *table, int __user *name, int nlen, | |
2269 | void __user *oldval, size_t __user *oldlenp, | |
2270 | void __user *newval, size_t newlen, void **context) | |
2271 | { | |
2272 | return -ENOSYS; | |
2273 | } | |
2274 | ||
2275 | int sysctl_ms_jiffies(ctl_table *table, int __user *name, int nlen, | |
2276 | void __user *oldval, size_t __user *oldlenp, | |
2277 | void __user *newval, size_t newlen, void **context) | |
2278 | { | |
2279 | return -ENOSYS; | |
2280 | } | |
2281 | ||
2282 | int proc_dostring(ctl_table *table, int write, struct file *filp, | |
2283 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2284 | { | |
2285 | return -ENOSYS; | |
2286 | } | |
2287 | ||
2288 | int proc_dointvec(ctl_table *table, int write, struct file *filp, | |
2289 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2290 | { | |
2291 | return -ENOSYS; | |
2292 | } | |
2293 | ||
2294 | int proc_dointvec_bset(ctl_table *table, int write, struct file *filp, | |
2295 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2296 | { | |
2297 | return -ENOSYS; | |
2298 | } | |
2299 | ||
2300 | int proc_dointvec_minmax(ctl_table *table, int write, struct file *filp, | |
2301 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2302 | { | |
2303 | return -ENOSYS; | |
2304 | } | |
2305 | ||
2306 | int proc_dointvec_jiffies(ctl_table *table, int write, struct file *filp, | |
2307 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2308 | { | |
2309 | return -ENOSYS; | |
2310 | } | |
2311 | ||
2312 | int proc_dointvec_userhz_jiffies(ctl_table *table, int write, struct file *filp, | |
2313 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2314 | { | |
2315 | return -ENOSYS; | |
2316 | } | |
2317 | ||
2318 | int proc_dointvec_ms_jiffies(ctl_table *table, int write, struct file *filp, | |
2319 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2320 | { | |
2321 | return -ENOSYS; | |
2322 | } | |
2323 | ||
2324 | int proc_doulongvec_minmax(ctl_table *table, int write, struct file *filp, | |
2325 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2326 | { | |
2327 | return -ENOSYS; | |
2328 | } | |
2329 | ||
2330 | int proc_doulongvec_ms_jiffies_minmax(ctl_table *table, int write, | |
2331 | struct file *filp, | |
2332 | void __user *buffer, | |
2333 | size_t *lenp, loff_t *ppos) | |
2334 | { | |
2335 | return -ENOSYS; | |
2336 | } | |
2337 | ||
2338 | struct ctl_table_header * register_sysctl_table(ctl_table * table, | |
2339 | int insert_at_head) | |
2340 | { | |
2341 | return NULL; | |
2342 | } | |
2343 | ||
2344 | void unregister_sysctl_table(struct ctl_table_header * table) | |
2345 | { | |
2346 | } | |
2347 | ||
2348 | #endif /* CONFIG_SYSCTL */ | |
2349 | ||
2350 | /* | |
2351 | * No sense putting this after each symbol definition, twice, | |
2352 | * exception granted :-) | |
2353 | */ | |
2354 | EXPORT_SYMBOL(proc_dointvec); | |
2355 | EXPORT_SYMBOL(proc_dointvec_jiffies); | |
2356 | EXPORT_SYMBOL(proc_dointvec_minmax); | |
2357 | EXPORT_SYMBOL(proc_dointvec_userhz_jiffies); | |
2358 | EXPORT_SYMBOL(proc_dointvec_ms_jiffies); | |
2359 | EXPORT_SYMBOL(proc_dostring); | |
2360 | EXPORT_SYMBOL(proc_doulongvec_minmax); | |
2361 | EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax); | |
2362 | EXPORT_SYMBOL(register_sysctl_table); | |
2363 | EXPORT_SYMBOL(sysctl_intvec); | |
2364 | EXPORT_SYMBOL(sysctl_jiffies); | |
2365 | EXPORT_SYMBOL(sysctl_ms_jiffies); | |
2366 | EXPORT_SYMBOL(sysctl_string); | |
2367 | EXPORT_SYMBOL(unregister_sysctl_table); |