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[CIFS] Fix spaces in cifs kconfig entry
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / kernel / sysctl.c
blob9990e10192e8e645c62d1e640b67b48edefe762d
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/net.h>
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;
62 extern int suid_dumpable;
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;
118 extern int spin_retry;
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 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
148 #ifdef CONFIG_INOTIFY
149 extern ctl_table inotify_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 *, void *);
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
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 },
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
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_doulongvec_minmax,
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_doulongvec_minmax,
964 },
965 #ifdef CONFIG_INOTIFY
966 {
967 .ctl_name = FS_INOTIFY,
968 .procname = "inotify",
969 .mode = 0555,
970 .child = inotify_table,
971 },
972 #endif
973 #endif
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 },
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 }
991 };
992
993 extern void init_irq_proc (void);
994
995 static DEFINE_SPINLOCK(sysctl_lock);
996
997 /* called under sysctl_lock */
998 static int use_table(struct ctl_table_header *p)
999 {
1000 if (unlikely(p->unregistering))
1001 return 0;
1002 p->used++;
1003 return 1;
1004 }
1005
1006 /* called under sysctl_lock */
1007 static void unuse_table(struct ctl_table_header *p)
1008 {
1009 if (!--p->used)
1010 if (unlikely(p->unregistering))
1011 complete(p->unregistering);
1012 }
1013
1014 /* called under sysctl_lock, will reacquire if has to wait */
1015 static void start_unregistering(struct ctl_table_header *p)
1016 {
1017 /*
1018 * if p->used is 0, nobody will ever touch that entry again;
1019 * we'll eliminate all paths to it before dropping sysctl_lock
1020 */
1021 if (unlikely(p->used)) {
1022 struct completion wait;
1023 init_completion(&wait);
1024 p->unregistering = &wait;
1025 spin_unlock(&sysctl_lock);
1026 wait_for_completion(&wait);
1027 spin_lock(&sysctl_lock);
1028 }
1029 /*
1030 * do not remove from the list until nobody holds it; walking the
1031 * list in do_sysctl() relies on that.
1032 */
1033 list_del_init(&p->ctl_entry);
1034 }
1035
1036 void __init sysctl_init(void)
1037 {
1038 #ifdef CONFIG_PROC_FS
1039 register_proc_table(root_table, proc_sys_root, &root_table_header);
1040 init_irq_proc();
1041 #endif
1042 }
1043
1044 int do_sysctl(int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp,
1045 void __user *newval, size_t newlen)
1046 {
1047 struct list_head *tmp;
1048 int error = -ENOTDIR;
1049
1050 if (nlen <= 0 || nlen >= CTL_MAXNAME)
1051 return -ENOTDIR;
1052 if (oldval) {
1053 int old_len;
1054 if (!oldlenp || get_user(old_len, oldlenp))
1055 return -EFAULT;
1056 }
1057 spin_lock(&sysctl_lock);
1058 tmp = &root_table_header.ctl_entry;
1059 do {
1060 struct ctl_table_header *head =
1061 list_entry(tmp, struct ctl_table_header, ctl_entry);
1062 void *context = NULL;
1063
1064 if (!use_table(head))
1065 continue;
1066
1067 spin_unlock(&sysctl_lock);
1068
1069 error = parse_table(name, nlen, oldval, oldlenp,
1070 newval, newlen, head->ctl_table,
1071 &context);
1072 kfree(context);
1073
1074 spin_lock(&sysctl_lock);
1075 unuse_table(head);
1076 if (error != -ENOTDIR)
1077 break;
1078 } while ((tmp = tmp->next) != &root_table_header.ctl_entry);
1079 spin_unlock(&sysctl_lock);
1080 return error;
1081 }
1082
1083 asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
1084 {
1085 struct __sysctl_args tmp;
1086 int error;
1087
1088 if (copy_from_user(&tmp, args, sizeof(tmp)))
1089 return -EFAULT;
1090
1091 lock_kernel();
1092 error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp,
1093 tmp.newval, tmp.newlen);
1094 unlock_kernel();
1095 return error;
1096 }
1097
1098 /*
1099 * ctl_perm does NOT grant the superuser all rights automatically, because
1100 * some sysctl variables are readonly even to root.
1101 */
1102
1103 static int test_perm(int mode, int op)
1104 {
1105 if (!current->euid)
1106 mode >>= 6;
1107 else if (in_egroup_p(0))
1108 mode >>= 3;
1109 if ((mode & op & 0007) == op)
1110 return 0;
1111 return -EACCES;
1112 }
1113
1114 static inline int ctl_perm(ctl_table *table, int op)
1115 {
1116 int error;
1117 error = security_sysctl(table, op);
1118 if (error)
1119 return error;
1120 return test_perm(table->mode, op);
1121 }
1122
1123 static int parse_table(int __user *name, int nlen,
1124 void __user *oldval, size_t __user *oldlenp,
1125 void __user *newval, size_t newlen,
1126 ctl_table *table, void **context)
1127 {
1128 int n;
1129 repeat:
1130 if (!nlen)
1131 return -ENOTDIR;
1132 if (get_user(n, name))
1133 return -EFAULT;
1134 for ( ; table->ctl_name; table++) {
1135 if (n == table->ctl_name || table->ctl_name == CTL_ANY) {
1136 int error;
1137 if (table->child) {
1138 if (ctl_perm(table, 001))
1139 return -EPERM;
1140 if (table->strategy) {
1141 error = table->strategy(
1142 table, name, nlen,
1143 oldval, oldlenp,
1144 newval, newlen, context);
1145 if (error)
1146 return error;
1147 }
1148 name++;
1149 nlen--;
1150 table = table->child;
1151 goto repeat;
1152 }
1153 error = do_sysctl_strategy(table, name, nlen,
1154 oldval, oldlenp,
1155 newval, newlen, context);
1156 return error;
1157 }
1158 }
1159 return -ENOTDIR;
1160 }
1161
1162 /* Perform the actual read/write of a sysctl table entry. */
1163 int do_sysctl_strategy (ctl_table *table,
1164 int __user *name, int nlen,
1165 void __user *oldval, size_t __user *oldlenp,
1166 void __user *newval, size_t newlen, void **context)
1167 {
1168 int op = 0, rc;
1169 size_t len;
1170
1171 if (oldval)
1172 op |= 004;
1173 if (newval)
1174 op |= 002;
1175 if (ctl_perm(table, op))
1176 return -EPERM;
1177
1178 if (table->strategy) {
1179 rc = table->strategy(table, name, nlen, oldval, oldlenp,
1180 newval, newlen, context);
1181 if (rc < 0)
1182 return rc;
1183 if (rc > 0)
1184 return 0;
1185 }
1186
1187 /* If there is no strategy routine, or if the strategy returns
1188 * zero, proceed with automatic r/w */
1189 if (table->data && table->maxlen) {
1190 if (oldval && oldlenp) {
1191 if (get_user(len, oldlenp))
1192 return -EFAULT;
1193 if (len) {
1194 if (len > table->maxlen)
1195 len = table->maxlen;
1196 if(copy_to_user(oldval, table->data, len))
1197 return -EFAULT;
1198 if(put_user(len, oldlenp))
1199 return -EFAULT;
1200 }
1201 }
1202 if (newval && newlen) {
1203 len = newlen;
1204 if (len > table->maxlen)
1205 len = table->maxlen;
1206 if(copy_from_user(table->data, newval, len))
1207 return -EFAULT;
1208 }
1209 }
1210 return 0;
1211 }
1212
1213 /**
1214 * register_sysctl_table - register a sysctl hierarchy
1215 * @table: the top-level table structure
1216 * @insert_at_head: whether the entry should be inserted in front or at the end
1217 *
1218 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1219 * array. An entry with a ctl_name of 0 terminates the table.
1220 *
1221 * The members of the &ctl_table structure are used as follows:
1222 *
1223 * ctl_name - This is the numeric sysctl value used by sysctl(2). The number
1224 * must be unique within that level of sysctl
1225 *
1226 * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1227 * enter a sysctl file
1228 *
1229 * data - a pointer to data for use by proc_handler
1230 *
1231 * maxlen - the maximum size in bytes of the data
1232 *
1233 * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1234 *
1235 * child - a pointer to the child sysctl table if this entry is a directory, or
1236 * %NULL.
1237 *
1238 * proc_handler - the text handler routine (described below)
1239 *
1240 * strategy - the strategy routine (described below)
1241 *
1242 * de - for internal use by the sysctl routines
1243 *
1244 * extra1, extra2 - extra pointers usable by the proc handler routines
1245 *
1246 * Leaf nodes in the sysctl tree will be represented by a single file
1247 * under /proc; non-leaf nodes will be represented by directories.
1248 *
1249 * sysctl(2) can automatically manage read and write requests through
1250 * the sysctl table. The data and maxlen fields of the ctl_table
1251 * struct enable minimal validation of the values being written to be
1252 * performed, and the mode field allows minimal authentication.
1253 *
1254 * More sophisticated management can be enabled by the provision of a
1255 * strategy routine with the table entry. This will be called before
1256 * any automatic read or write of the data is performed.
1257 *
1258 * The strategy routine may return
1259 *
1260 * < 0 - Error occurred (error is passed to user process)
1261 *
1262 * 0 - OK - proceed with automatic read or write.
1263 *
1264 * > 0 - OK - read or write has been done by the strategy routine, so
1265 * return immediately.
1266 *
1267 * There must be a proc_handler routine for any terminal nodes
1268 * mirrored under /proc/sys (non-terminals are handled by a built-in
1269 * directory handler). Several default handlers are available to
1270 * cover common cases -
1271 *
1272 * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
1273 * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(),
1274 * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
1275 *
1276 * It is the handler's job to read the input buffer from user memory
1277 * and process it. The handler should return 0 on success.
1278 *
1279 * This routine returns %NULL on a failure to register, and a pointer
1280 * to the table header on success.
1281 */
1282 struct ctl_table_header *register_sysctl_table(ctl_table * table,
1283 int insert_at_head)
1284 {
1285 struct ctl_table_header *tmp;
1286 tmp = kmalloc(sizeof(struct ctl_table_header), GFP_KERNEL);
1287 if (!tmp)
1288 return NULL;
1289 tmp->ctl_table = table;
1290 INIT_LIST_HEAD(&tmp->ctl_entry);
1291 tmp->used = 0;
1292 tmp->unregistering = NULL;
1293 spin_lock(&sysctl_lock);
1294 if (insert_at_head)
1295 list_add(&tmp->ctl_entry, &root_table_header.ctl_entry);
1296 else
1297 list_add_tail(&tmp->ctl_entry, &root_table_header.ctl_entry);
1298 spin_unlock(&sysctl_lock);
1299 #ifdef CONFIG_PROC_FS
1300 register_proc_table(table, proc_sys_root, tmp);
1301 #endif
1302 return tmp;
1303 }
1304
1305 /**
1306 * unregister_sysctl_table - unregister a sysctl table hierarchy
1307 * @header: the header returned from register_sysctl_table
1308 *
1309 * Unregisters the sysctl table and all children. proc entries may not
1310 * actually be removed until they are no longer used by anyone.
1311 */
1312 void unregister_sysctl_table(struct ctl_table_header * header)
1313 {
1314 might_sleep();
1315 spin_lock(&sysctl_lock);
1316 start_unregistering(header);
1317 #ifdef CONFIG_PROC_FS
1318 unregister_proc_table(header->ctl_table, proc_sys_root);
1319 #endif
1320 spin_unlock(&sysctl_lock);
1321 kfree(header);
1322 }
1323
1324 /*
1325 * /proc/sys support
1326 */
1327
1328 #ifdef CONFIG_PROC_FS
1329
1330 /* Scan the sysctl entries in table and add them all into /proc */
1331 static void register_proc_table(ctl_table * table, struct proc_dir_entry *root, void *set)
1332 {
1333 struct proc_dir_entry *de;
1334 int len;
1335 mode_t mode;
1336
1337 for (; table->ctl_name; table++) {
1338 /* Can't do anything without a proc name. */
1339 if (!table->procname)
1340 continue;
1341 /* Maybe we can't do anything with it... */
1342 if (!table->proc_handler && !table->child) {
1343 printk(KERN_WARNING "SYSCTL: Can't register %s\n",
1344 table->procname);
1345 continue;
1346 }
1347
1348 len = strlen(table->procname);
1349 mode = table->mode;
1350
1351 de = NULL;
1352 if (table->proc_handler)
1353 mode |= S_IFREG;
1354 else {
1355 mode |= S_IFDIR;
1356 for (de = root->subdir; de; de = de->next) {
1357 if (proc_match(len, table->procname, de))
1358 break;
1359 }
1360 /* If the subdir exists already, de is non-NULL */
1361 }
1362
1363 if (!de) {
1364 de = create_proc_entry(table->procname, mode, root);
1365 if (!de)
1366 continue;
1367 de->set = set;
1368 de->data = (void *) table;
1369 if (table->proc_handler)
1370 de->proc_fops = &proc_sys_file_operations;
1371 }
1372 table->de = de;
1373 if (de->mode & S_IFDIR)
1374 register_proc_table(table->child, de, set);
1375 }
1376 }
1377
1378 /*
1379 * Unregister a /proc sysctl table and any subdirectories.
1380 */
1381 static void unregister_proc_table(ctl_table * table, struct proc_dir_entry *root)
1382 {
1383 struct proc_dir_entry *de;
1384 for (; table->ctl_name; table++) {
1385 if (!(de = table->de))
1386 continue;
1387 if (de->mode & S_IFDIR) {
1388 if (!table->child) {
1389 printk (KERN_ALERT "Help - malformed sysctl tree on free\n");
1390 continue;
1391 }
1392 unregister_proc_table(table->child, de);
1393
1394 /* Don't unregister directories which still have entries.. */
1395 if (de->subdir)
1396 continue;
1397 }
1398
1399 /*
1400 * In any case, mark the entry as goner; we'll keep it
1401 * around if it's busy, but we'll know to do nothing with
1402 * its fields. We are under sysctl_lock here.
1403 */
1404 de->data = NULL;
1405
1406 /* Don't unregister proc entries that are still being used.. */
1407 if (atomic_read(&de->count))
1408 continue;
1409
1410 table->de = NULL;
1411 remove_proc_entry(table->procname, root);
1412 }
1413 }
1414
1415 static ssize_t do_rw_proc(int write, struct file * file, char __user * buf,
1416 size_t count, loff_t *ppos)
1417 {
1418 int op;
1419 struct proc_dir_entry *de = PDE(file->f_dentry->d_inode);
1420 struct ctl_table *table;
1421 size_t res;
1422 ssize_t error = -ENOTDIR;
1423
1424 spin_lock(&sysctl_lock);
1425 if (de && de->data && use_table(de->set)) {
1426 /*
1427 * at that point we know that sysctl was not unregistered
1428 * and won't be until we finish
1429 */
1430 spin_unlock(&sysctl_lock);
1431 table = (struct ctl_table *) de->data;
1432 if (!table || !table->proc_handler)
1433 goto out;
1434 error = -EPERM;
1435 op = (write ? 002 : 004);
1436 if (ctl_perm(table, op))
1437 goto out;
1438
1439 /* careful: calling conventions are nasty here */
1440 res = count;
1441 error = (*table->proc_handler)(table, write, file,
1442 buf, &res, ppos);
1443 if (!error)
1444 error = res;
1445 out:
1446 spin_lock(&sysctl_lock);
1447 unuse_table(de->set);
1448 }
1449 spin_unlock(&sysctl_lock);
1450 return error;
1451 }
1452
1453 static int proc_opensys(struct inode *inode, struct file *file)
1454 {
1455 if (file->f_mode & FMODE_WRITE) {
1456 /*
1457 * sysctl entries that are not writable,
1458 * are _NOT_ writable, capabilities or not.
1459 */
1460 if (!(inode->i_mode & S_IWUSR))
1461 return -EPERM;
1462 }
1463
1464 return 0;
1465 }
1466
1467 static ssize_t proc_readsys(struct file * file, char __user * buf,
1468 size_t count, loff_t *ppos)
1469 {
1470 return do_rw_proc(0, file, buf, count, ppos);
1471 }
1472
1473 static ssize_t proc_writesys(struct file * file, const char __user * buf,
1474 size_t count, loff_t *ppos)
1475 {
1476 return do_rw_proc(1, file, (char __user *) buf, count, ppos);
1477 }
1478
1479 /**
1480 * proc_dostring - read a string sysctl
1481 * @table: the sysctl table
1482 * @write: %TRUE if this is a write to the sysctl file
1483 * @filp: the file structure
1484 * @buffer: the user buffer
1485 * @lenp: the size of the user buffer
1486 * @ppos: file position
1487 *
1488 * Reads/writes a string from/to the user buffer. If the kernel
1489 * buffer provided is not large enough to hold the string, the
1490 * string is truncated. The copied string is %NULL-terminated.
1491 * If the string is being read by the user process, it is copied
1492 * and a newline '\n' is added. It is truncated if the buffer is
1493 * not large enough.
1494 *
1495 * Returns 0 on success.
1496 */
1497 int proc_dostring(ctl_table *table, int write, struct file *filp,
1498 void __user *buffer, size_t *lenp, loff_t *ppos)
1499 {
1500 size_t len;
1501 char __user *p;
1502 char c;
1503
1504 if (!table->data || !table->maxlen || !*lenp ||
1505 (*ppos && !write)) {
1506 *lenp = 0;
1507 return 0;
1508 }
1509
1510 if (write) {
1511 len = 0;
1512 p = buffer;
1513 while (len < *lenp) {
1514 if (get_user(c, p++))
1515 return -EFAULT;
1516 if (c == 0 || c == '\n')
1517 break;
1518 len++;
1519 }
1520 if (len >= table->maxlen)
1521 len = table->maxlen-1;
1522 if(copy_from_user(table->data, buffer, len))
1523 return -EFAULT;
1524 ((char *) table->data)[len] = 0;
1525 *ppos += *lenp;
1526 } else {
1527 len = strlen(table->data);
1528 if (len > table->maxlen)
1529 len = table->maxlen;
1530 if (len > *lenp)
1531 len = *lenp;
1532 if (len)
1533 if(copy_to_user(buffer, table->data, len))
1534 return -EFAULT;
1535 if (len < *lenp) {
1536 if(put_user('\n', ((char __user *) buffer) + len))
1537 return -EFAULT;
1538 len++;
1539 }
1540 *lenp = len;
1541 *ppos += len;
1542 }
1543 return 0;
1544 }
1545
1546 /*
1547 * Special case of dostring for the UTS structure. This has locks
1548 * to observe. Should this be in kernel/sys.c ????
1549 */
1550
1551 static int proc_doutsstring(ctl_table *table, int write, struct file *filp,
1552 void __user *buffer, size_t *lenp, loff_t *ppos)
1553 {
1554 int r;
1555
1556 if (!write) {
1557 down_read(&uts_sem);
1558 r=proc_dostring(table,0,filp,buffer,lenp, ppos);
1559 up_read(&uts_sem);
1560 } else {
1561 down_write(&uts_sem);
1562 r=proc_dostring(table,1,filp,buffer,lenp, ppos);
1563 up_write(&uts_sem);
1564 }
1565 return r;
1566 }
1567
1568 static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp,
1569 int *valp,
1570 int write, void *data)
1571 {
1572 if (write) {
1573 *valp = *negp ? -*lvalp : *lvalp;
1574 } else {
1575 int val = *valp;
1576 if (val < 0) {
1577 *negp = -1;
1578 *lvalp = (unsigned long)-val;
1579 } else {
1580 *negp = 0;
1581 *lvalp = (unsigned long)val;
1582 }
1583 }
1584 return 0;
1585 }
1586
1587 static int do_proc_dointvec(ctl_table *table, int write, struct file *filp,
1588 void __user *buffer, size_t *lenp, loff_t *ppos,
1589 int (*conv)(int *negp, unsigned long *lvalp, int *valp,
1590 int write, void *data),
1591 void *data)
1592 {
1593 #define TMPBUFLEN 21
1594 int *i, vleft, first=1, neg, val;
1595 unsigned long lval;
1596 size_t left, len;
1597
1598 char buf[TMPBUFLEN], *p;
1599 char __user *s = buffer;
1600
1601 if (!table->data || !table->maxlen || !*lenp ||
1602 (*ppos && !write)) {
1603 *lenp = 0;
1604 return 0;
1605 }
1606
1607 i = (int *) table->data;
1608 vleft = table->maxlen / sizeof(*i);
1609 left = *lenp;
1610
1611 if (!conv)
1612 conv = do_proc_dointvec_conv;
1613
1614 for (; left && vleft--; i++, first=0) {
1615 if (write) {
1616 while (left) {
1617 char c;
1618 if (get_user(c, s))
1619 return -EFAULT;
1620 if (!isspace(c))
1621 break;
1622 left--;
1623 s++;
1624 }
1625 if (!left)
1626 break;
1627 neg = 0;
1628 len = left;
1629 if (len > sizeof(buf) - 1)
1630 len = sizeof(buf) - 1;
1631 if (copy_from_user(buf, s, len))
1632 return -EFAULT;
1633 buf[len] = 0;
1634 p = buf;
1635 if (*p == '-' && left > 1) {
1636 neg = 1;
1637 left--, p++;
1638 }
1639 if (*p < '0' || *p > '9')
1640 break;
1641
1642 lval = simple_strtoul(p, &p, 0);
1643
1644 len = p-buf;
1645 if ((len < left) && *p && !isspace(*p))
1646 break;
1647 if (neg)
1648 val = -val;
1649 s += len;
1650 left -= len;
1651
1652 if (conv(&neg, &lval, i, 1, data))
1653 break;
1654 } else {
1655 p = buf;
1656 if (!first)
1657 *p++ = '\t';
1658
1659 if (conv(&neg, &lval, i, 0, data))
1660 break;
1661
1662 sprintf(p, "%s%lu", neg ? "-" : "", lval);
1663 len = strlen(buf);
1664 if (len > left)
1665 len = left;
1666 if(copy_to_user(s, buf, len))
1667 return -EFAULT;
1668 left -= len;
1669 s += len;
1670 }
1671 }
1672
1673 if (!write && !first && left) {
1674 if(put_user('\n', s))
1675 return -EFAULT;
1676 left--, s++;
1677 }
1678 if (write) {
1679 while (left) {
1680 char c;
1681 if (get_user(c, s++))
1682 return -EFAULT;
1683 if (!isspace(c))
1684 break;
1685 left--;
1686 }
1687 }
1688 if (write && first)
1689 return -EINVAL;
1690 *lenp -= left;
1691 *ppos += *lenp;
1692 return 0;
1693 #undef TMPBUFLEN
1694 }
1695
1696 /**
1697 * proc_dointvec - read a vector of integers
1698 * @table: the sysctl table
1699 * @write: %TRUE if this is a write to the sysctl file
1700 * @filp: the file structure
1701 * @buffer: the user buffer
1702 * @lenp: the size of the user buffer
1703 * @ppos: file position
1704 *
1705 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1706 * values from/to the user buffer, treated as an ASCII string.
1707 *
1708 * Returns 0 on success.
1709 */
1710 int proc_dointvec(ctl_table *table, int write, struct file *filp,
1711 void __user *buffer, size_t *lenp, loff_t *ppos)
1712 {
1713 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
1714 NULL,NULL);
1715 }
1716
1717 #define OP_SET 0
1718 #define OP_AND 1
1719 #define OP_OR 2
1720 #define OP_MAX 3
1721 #define OP_MIN 4
1722
1723 static int do_proc_dointvec_bset_conv(int *negp, unsigned long *lvalp,
1724 int *valp,
1725 int write, void *data)
1726 {
1727 int op = *(int *)data;
1728 if (write) {
1729 int val = *negp ? -*lvalp : *lvalp;
1730 switch(op) {
1731 case OP_SET: *valp = val; break;
1732 case OP_AND: *valp &= val; break;
1733 case OP_OR: *valp |= val; break;
1734 case OP_MAX: if(*valp < val)
1735 *valp = val;
1736 break;
1737 case OP_MIN: if(*valp > val)
1738 *valp = val;
1739 break;
1740 }
1741 } else {
1742 int val = *valp;
1743 if (val < 0) {
1744 *negp = -1;
1745 *lvalp = (unsigned long)-val;
1746 } else {
1747 *negp = 0;
1748 *lvalp = (unsigned long)val;
1749 }
1750 }
1751 return 0;
1752 }
1753
1754 /*
1755 * init may raise the set.
1756 */
1757
1758 int proc_dointvec_bset(ctl_table *table, int write, struct file *filp,
1759 void __user *buffer, size_t *lenp, loff_t *ppos)
1760 {
1761 int op;
1762
1763 if (!capable(CAP_SYS_MODULE)) {
1764 return -EPERM;
1765 }
1766
1767 op = (current->pid == 1) ? OP_SET : OP_AND;
1768 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
1769 do_proc_dointvec_bset_conv,&op);
1770 }
1771
1772 struct do_proc_dointvec_minmax_conv_param {
1773 int *min;
1774 int *max;
1775 };
1776
1777 static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp,
1778 int *valp,
1779 int write, void *data)
1780 {
1781 struct do_proc_dointvec_minmax_conv_param *param = data;
1782 if (write) {
1783 int val = *negp ? -*lvalp : *lvalp;
1784 if ((param->min && *param->min > val) ||
1785 (param->max && *param->max < val))
1786 return -EINVAL;
1787 *valp = val;
1788 } else {
1789 int val = *valp;
1790 if (val < 0) {
1791 *negp = -1;
1792 *lvalp = (unsigned long)-val;
1793 } else {
1794 *negp = 0;
1795 *lvalp = (unsigned long)val;
1796 }
1797 }
1798 return 0;
1799 }
1800
1801 /**
1802 * proc_dointvec_minmax - read a vector of integers with min/max values
1803 * @table: the sysctl table
1804 * @write: %TRUE if this is a write to the sysctl file
1805 * @filp: the file structure
1806 * @buffer: the user buffer
1807 * @lenp: the size of the user buffer
1808 * @ppos: file position
1809 *
1810 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1811 * values from/to the user buffer, treated as an ASCII string.
1812 *
1813 * This routine will ensure the values are within the range specified by
1814 * table->extra1 (min) and table->extra2 (max).
1815 *
1816 * Returns 0 on success.
1817 */
1818 int proc_dointvec_minmax(ctl_table *table, int write, struct file *filp,
1819 void __user *buffer, size_t *lenp, loff_t *ppos)
1820 {
1821 struct do_proc_dointvec_minmax_conv_param param = {
1822 .min = (int *) table->extra1,
1823 .max = (int *) table->extra2,
1824 };
1825 return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
1826 do_proc_dointvec_minmax_conv, &param);
1827 }
1828
1829 static int do_proc_doulongvec_minmax(ctl_table *table, int write,
1830 struct file *filp,
1831 void __user *buffer,
1832 size_t *lenp, loff_t *ppos,
1833 unsigned long convmul,
1834 unsigned long convdiv)
1835 {
1836 #define TMPBUFLEN 21
1837 unsigned long *i, *min, *max, val;
1838 int vleft, first=1, neg;
1839 size_t len, left;
1840 char buf[TMPBUFLEN], *p;
1841 char __user *s = buffer;
1842
1843 if (!table->data || !table->maxlen || !*lenp ||
1844 (*ppos && !write)) {
1845 *lenp = 0;
1846 return 0;
1847 }
1848
1849 i = (unsigned long *) table->data;
1850 min = (unsigned long *) table->extra1;
1851 max = (unsigned long *) table->extra2;
1852 vleft = table->maxlen / sizeof(unsigned long);
1853 left = *lenp;
1854
1855 for (; left && vleft--; i++, min++, max++, first=0) {
1856 if (write) {
1857 while (left) {
1858 char c;
1859 if (get_user(c, s))
1860 return -EFAULT;
1861 if (!isspace(c))
1862 break;
1863 left--;
1864 s++;
1865 }
1866 if (!left)
1867 break;
1868 neg = 0;
1869 len = left;
1870 if (len > TMPBUFLEN-1)
1871 len = TMPBUFLEN-1;
1872 if (copy_from_user(buf, s, len))
1873 return -EFAULT;
1874 buf[len] = 0;
1875 p = buf;
1876 if (*p == '-' && left > 1) {
1877 neg = 1;
1878 left--, p++;
1879 }
1880 if (*p < '0' || *p > '9')
1881 break;
1882 val = simple_strtoul(p, &p, 0) * convmul / convdiv ;
1883 len = p-buf;
1884 if ((len < left) && *p && !isspace(*p))
1885 break;
1886 if (neg)
1887 val = -val;
1888 s += len;
1889 left -= len;
1890
1891 if(neg)
1892 continue;
1893 if ((min && val < *min) || (max && val > *max))
1894 continue;
1895 *i = val;
1896 } else {
1897 p = buf;
1898 if (!first)
1899 *p++ = '\t';
1900 sprintf(p, "%lu", convdiv * (*i) / convmul);
1901 len = strlen(buf);
1902 if (len > left)
1903 len = left;
1904 if(copy_to_user(s, buf, len))
1905 return -EFAULT;
1906 left -= len;
1907 s += len;
1908 }
1909 }
1910
1911 if (!write && !first && left) {
1912 if(put_user('\n', s))
1913 return -EFAULT;
1914 left--, s++;
1915 }
1916 if (write) {
1917 while (left) {
1918 char c;
1919 if (get_user(c, s++))
1920 return -EFAULT;
1921 if (!isspace(c))
1922 break;
1923 left--;
1924 }
1925 }
1926 if (write && first)
1927 return -EINVAL;
1928 *lenp -= left;
1929 *ppos += *lenp;
1930 return 0;
1931 #undef TMPBUFLEN
1932 }
1933
1934 /**
1935 * proc_doulongvec_minmax - read a vector of long integers with min/max values
1936 * @table: the sysctl table
1937 * @write: %TRUE if this is a write to the sysctl file
1938 * @filp: the file structure
1939 * @buffer: the user buffer
1940 * @lenp: the size of the user buffer
1941 * @ppos: file position
1942 *
1943 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
1944 * values from/to the user buffer, treated as an ASCII string.
1945 *
1946 * This routine will ensure the values are within the range specified by
1947 * table->extra1 (min) and table->extra2 (max).
1948 *
1949 * Returns 0 on success.
1950 */
1951 int proc_doulongvec_minmax(ctl_table *table, int write, struct file *filp,
1952 void __user *buffer, size_t *lenp, loff_t *ppos)
1953 {
1954 return do_proc_doulongvec_minmax(table, write, filp, buffer, lenp, ppos, 1l, 1l);
1955 }
1956
1957 /**
1958 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
1959 * @table: the sysctl table
1960 * @write: %TRUE if this is a write to the sysctl file
1961 * @filp: the file structure
1962 * @buffer: the user buffer
1963 * @lenp: the size of the user buffer
1964 * @ppos: file position
1965 *
1966 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
1967 * values from/to the user buffer, treated as an ASCII string. The values
1968 * are treated as milliseconds, and converted to jiffies when they are stored.
1969 *
1970 * This routine will ensure the values are within the range specified by
1971 * table->extra1 (min) and table->extra2 (max).
1972 *
1973 * Returns 0 on success.
1974 */
1975 int proc_doulongvec_ms_jiffies_minmax(ctl_table *table, int write,
1976 struct file *filp,
1977 void __user *buffer,
1978 size_t *lenp, loff_t *ppos)
1979 {
1980 return do_proc_doulongvec_minmax(table, write, filp, buffer,
1981 lenp, ppos, HZ, 1000l);
1982 }
1983
1984
1985 static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp,
1986 int *valp,
1987 int write, void *data)
1988 {
1989 if (write) {
1990 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
1991 } else {
1992 int val = *valp;
1993 unsigned long lval;
1994 if (val < 0) {
1995 *negp = -1;
1996 lval = (unsigned long)-val;
1997 } else {
1998 *negp = 0;
1999 lval = (unsigned long)val;
2000 }
2001 *lvalp = lval / HZ;
2002 }
2003 return 0;
2004 }
2005
2006 static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp,
2007 int *valp,
2008 int write, void *data)
2009 {
2010 if (write) {
2011 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2012 } else {
2013 int val = *valp;
2014 unsigned long lval;
2015 if (val < 0) {
2016 *negp = -1;
2017 lval = (unsigned long)-val;
2018 } else {
2019 *negp = 0;
2020 lval = (unsigned long)val;
2021 }
2022 *lvalp = jiffies_to_clock_t(lval);
2023 }
2024 return 0;
2025 }
2026
2027 static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp,
2028 int *valp,
2029 int write, void *data)
2030 {
2031 if (write) {
2032 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2033 } else {
2034 int val = *valp;
2035 unsigned long lval;
2036 if (val < 0) {
2037 *negp = -1;
2038 lval = (unsigned long)-val;
2039 } else {
2040 *negp = 0;
2041 lval = (unsigned long)val;
2042 }
2043 *lvalp = jiffies_to_msecs(lval);
2044 }
2045 return 0;
2046 }
2047
2048 /**
2049 * proc_dointvec_jiffies - read a vector of integers as seconds
2050 * @table: the sysctl table
2051 * @write: %TRUE if this is a write to the sysctl file
2052 * @filp: the file structure
2053 * @buffer: the user buffer
2054 * @lenp: the size of the user buffer
2055 * @ppos: file position
2056 *
2057 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2058 * values from/to the user buffer, treated as an ASCII string.
2059 * The values read are assumed to be in seconds, and are converted into
2060 * jiffies.
2061 *
2062 * Returns 0 on success.
2063 */
2064 int proc_dointvec_jiffies(ctl_table *table, int write, struct file *filp,
2065 void __user *buffer, size_t *lenp, loff_t *ppos)
2066 {
2067 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2068 do_proc_dointvec_jiffies_conv,NULL);
2069 }
2070
2071 /**
2072 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2073 * @table: the sysctl table
2074 * @write: %TRUE if this is a write to the sysctl file
2075 * @filp: the file structure
2076 * @buffer: the user buffer
2077 * @lenp: the size of the user buffer
2078 * @ppos: pointer to the file position
2079 *
2080 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2081 * values from/to the user buffer, treated as an ASCII string.
2082 * The values read are assumed to be in 1/USER_HZ seconds, and
2083 * are converted into jiffies.
2084 *
2085 * Returns 0 on success.
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 do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2091 do_proc_dointvec_userhz_jiffies_conv,NULL);
2092 }
2093
2094 /**
2095 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2096 * @table: the sysctl table
2097 * @write: %TRUE if this is a write to the sysctl file
2098 * @filp: the file structure
2099 * @buffer: the user buffer
2100 * @lenp: the size of the user buffer
2101 * @ppos: file position
2102 * @ppos: the current position in the file
2103 *
2104 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2105 * values from/to the user buffer, treated as an ASCII string.
2106 * The values read are assumed to be in 1/1000 seconds, and
2107 * are converted into jiffies.
2108 *
2109 * Returns 0 on success.
2110 */
2111 int proc_dointvec_ms_jiffies(ctl_table *table, int write, struct file *filp,
2112 void __user *buffer, size_t *lenp, loff_t *ppos)
2113 {
2114 return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2115 do_proc_dointvec_ms_jiffies_conv, NULL);
2116 }
2117
2118 #else /* CONFIG_PROC_FS */
2119
2120 int proc_dostring(ctl_table *table, int write, struct file *filp,
2121 void __user *buffer, size_t *lenp, loff_t *ppos)
2122 {
2123 return -ENOSYS;
2124 }
2125
2126 static int proc_doutsstring(ctl_table *table, int write, struct file *filp,
2127 void __user *buffer, size_t *lenp, loff_t *ppos)
2128 {
2129 return -ENOSYS;
2130 }
2131
2132 int proc_dointvec(ctl_table *table, int write, struct file *filp,
2133 void __user *buffer, size_t *lenp, loff_t *ppos)
2134 {
2135 return -ENOSYS;
2136 }
2137
2138 int proc_dointvec_bset(ctl_table *table, int write, struct file *filp,
2139 void __user *buffer, size_t *lenp, loff_t *ppos)
2140 {
2141 return -ENOSYS;
2142 }
2143
2144 int proc_dointvec_minmax(ctl_table *table, int write, struct file *filp,
2145 void __user *buffer, size_t *lenp, loff_t *ppos)
2146 {
2147 return -ENOSYS;
2148 }
2149
2150 int proc_dointvec_jiffies(ctl_table *table, int write, struct file *filp,
2151 void __user *buffer, size_t *lenp, loff_t *ppos)
2152 {
2153 return -ENOSYS;
2154 }
2155
2156 int proc_dointvec_userhz_jiffies(ctl_table *table, int write, struct file *filp,
2157 void __user *buffer, size_t *lenp, loff_t *ppos)
2158 {
2159 return -ENOSYS;
2160 }
2161
2162 int proc_dointvec_ms_jiffies(ctl_table *table, int write, struct file *filp,
2163 void __user *buffer, size_t *lenp, loff_t *ppos)
2164 {
2165 return -ENOSYS;
2166 }
2167
2168 int proc_doulongvec_minmax(ctl_table *table, int write, struct file *filp,
2169 void __user *buffer, size_t *lenp, loff_t *ppos)
2170 {
2171 return -ENOSYS;
2172 }
2173
2174 int proc_doulongvec_ms_jiffies_minmax(ctl_table *table, int write,
2175 struct file *filp,
2176 void __user *buffer,
2177 size_t *lenp, loff_t *ppos)
2178 {
2179 return -ENOSYS;
2180 }
2181
2182
2183 #endif /* CONFIG_PROC_FS */
2184
2185
2186 /*
2187 * General sysctl support routines
2188 */
2189
2190 /* The generic string strategy routine: */
2191 int sysctl_string(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 size_t l, len;
2196
2197 if (!table->data || !table->maxlen)
2198 return -ENOTDIR;
2199
2200 if (oldval && oldlenp) {
2201 if (get_user(len, oldlenp))
2202 return -EFAULT;
2203 if (len) {
2204 l = strlen(table->data);
2205 if (len > l) len = l;
2206 if (len >= table->maxlen)
2207 len = table->maxlen;
2208 if(copy_to_user(oldval, table->data, len))
2209 return -EFAULT;
2210 if(put_user(0, ((char __user *) oldval) + len))
2211 return -EFAULT;
2212 if(put_user(len, oldlenp))
2213 return -EFAULT;
2214 }
2215 }
2216 if (newval && newlen) {
2217 len = newlen;
2218 if (len > table->maxlen)
2219 len = table->maxlen;
2220 if(copy_from_user(table->data, newval, len))
2221 return -EFAULT;
2222 if (len == table->maxlen)
2223 len--;
2224 ((char *) table->data)[len] = 0;
2225 }
2226 return 0;
2227 }
2228
2229 /*
2230 * This function makes sure that all of the integers in the vector
2231 * are between the minimum and maximum values given in the arrays
2232 * table->extra1 and table->extra2, respectively.
2233 */
2234 int sysctl_intvec(ctl_table *table, int __user *name, int nlen,
2235 void __user *oldval, size_t __user *oldlenp,
2236 void __user *newval, size_t newlen, void **context)
2237 {
2238
2239 if (newval && newlen) {
2240 int __user *vec = (int __user *) newval;
2241 int *min = (int *) table->extra1;
2242 int *max = (int *) table->extra2;
2243 size_t length;
2244 int i;
2245
2246 if (newlen % sizeof(int) != 0)
2247 return -EINVAL;
2248
2249 if (!table->extra1 && !table->extra2)
2250 return 0;
2251
2252 if (newlen > table->maxlen)
2253 newlen = table->maxlen;
2254 length = newlen / sizeof(int);
2255
2256 for (i = 0; i < length; i++) {
2257 int value;
2258 if (get_user(value, vec + i))
2259 return -EFAULT;
2260 if (min && value < min[i])
2261 return -EINVAL;
2262 if (max && value > max[i])
2263 return -EINVAL;
2264 }
2265 }
2266 return 0;
2267 }
2268
2269 /* Strategy function to convert jiffies to seconds */
2270 int sysctl_jiffies(ctl_table *table, int __user *name, int nlen,
2271 void __user *oldval, size_t __user *oldlenp,
2272 void __user *newval, size_t newlen, void **context)
2273 {
2274 if (oldval) {
2275 size_t olen;
2276 if (oldlenp) {
2277 if (get_user(olen, oldlenp))
2278 return -EFAULT;
2279 if (olen!=sizeof(int))
2280 return -EINVAL;
2281 }
2282 if (put_user(*(int *)(table->data)/HZ, (int __user *)oldval) ||
2283 (oldlenp && put_user(sizeof(int),oldlenp)))
2284 return -EFAULT;
2285 }
2286 if (newval && newlen) {
2287 int new;
2288 if (newlen != sizeof(int))
2289 return -EINVAL;
2290 if (get_user(new, (int __user *)newval))
2291 return -EFAULT;
2292 *(int *)(table->data) = new*HZ;
2293 }
2294 return 1;
2295 }
2296
2297 /* Strategy function to convert jiffies to seconds */
2298 int sysctl_ms_jiffies(ctl_table *table, int __user *name, int nlen,
2299 void __user *oldval, size_t __user *oldlenp,
2300 void __user *newval, size_t newlen, void **context)
2301 {
2302 if (oldval) {
2303 size_t olen;
2304 if (oldlenp) {
2305 if (get_user(olen, oldlenp))
2306 return -EFAULT;
2307 if (olen!=sizeof(int))
2308 return -EINVAL;
2309 }
2310 if (put_user(jiffies_to_msecs(*(int *)(table->data)), (int __user *)oldval) ||
2311 (oldlenp && put_user(sizeof(int),oldlenp)))
2312 return -EFAULT;
2313 }
2314 if (newval && newlen) {
2315 int new;
2316 if (newlen != sizeof(int))
2317 return -EINVAL;
2318 if (get_user(new, (int __user *)newval))
2319 return -EFAULT;
2320 *(int *)(table->data) = msecs_to_jiffies(new);
2321 }
2322 return 1;
2323 }
2324
2325 #else /* CONFIG_SYSCTL */
2326
2327
2328 asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
2329 {
2330 return -ENOSYS;
2331 }
2332
2333 int sysctl_string(ctl_table *table, int __user *name, int nlen,
2334 void __user *oldval, size_t __user *oldlenp,
2335 void __user *newval, size_t newlen, void **context)
2336 {
2337 return -ENOSYS;
2338 }
2339
2340 int sysctl_intvec(ctl_table *table, int __user *name, int nlen,
2341 void __user *oldval, size_t __user *oldlenp,
2342 void __user *newval, size_t newlen, void **context)
2343 {
2344 return -ENOSYS;
2345 }
2346
2347 int sysctl_jiffies(ctl_table *table, int __user *name, int nlen,
2348 void __user *oldval, size_t __user *oldlenp,
2349 void __user *newval, size_t newlen, void **context)
2350 {
2351 return -ENOSYS;
2352 }
2353
2354 int sysctl_ms_jiffies(ctl_table *table, int __user *name, int nlen,
2355 void __user *oldval, size_t __user *oldlenp,
2356 void __user *newval, size_t newlen, void **context)
2357 {
2358 return -ENOSYS;
2359 }
2360
2361 int proc_dostring(ctl_table *table, int write, struct file *filp,
2362 void __user *buffer, size_t *lenp, loff_t *ppos)
2363 {
2364 return -ENOSYS;
2365 }
2366
2367 int proc_dointvec(ctl_table *table, int write, struct file *filp,
2368 void __user *buffer, size_t *lenp, loff_t *ppos)
2369 {
2370 return -ENOSYS;
2371 }
2372
2373 int proc_dointvec_bset(ctl_table *table, int write, struct file *filp,
2374 void __user *buffer, size_t *lenp, loff_t *ppos)
2375 {
2376 return -ENOSYS;
2377 }
2378
2379 int proc_dointvec_minmax(ctl_table *table, int write, struct file *filp,
2380 void __user *buffer, size_t *lenp, loff_t *ppos)
2381 {
2382 return -ENOSYS;
2383 }
2384
2385 int proc_dointvec_jiffies(ctl_table *table, int write, struct file *filp,
2386 void __user *buffer, size_t *lenp, loff_t *ppos)
2387 {
2388 return -ENOSYS;
2389 }
2390
2391 int proc_dointvec_userhz_jiffies(ctl_table *table, int write, struct file *filp,
2392 void __user *buffer, size_t *lenp, loff_t *ppos)
2393 {
2394 return -ENOSYS;
2395 }
2396
2397 int proc_dointvec_ms_jiffies(ctl_table *table, int write, struct file *filp,
2398 void __user *buffer, size_t *lenp, loff_t *ppos)
2399 {
2400 return -ENOSYS;
2401 }
2402
2403 int proc_doulongvec_minmax(ctl_table *table, int write, struct file *filp,
2404 void __user *buffer, size_t *lenp, loff_t *ppos)
2405 {
2406 return -ENOSYS;
2407 }
2408
2409 int proc_doulongvec_ms_jiffies_minmax(ctl_table *table, int write,
2410 struct file *filp,
2411 void __user *buffer,
2412 size_t *lenp, loff_t *ppos)
2413 {
2414 return -ENOSYS;
2415 }
2416
2417 struct ctl_table_header * register_sysctl_table(ctl_table * table,
2418 int insert_at_head)
2419 {
2420 return NULL;
2421 }
2422
2423 void unregister_sysctl_table(struct ctl_table_header * table)
2424 {
2425 }
2426
2427 #endif /* CONFIG_SYSCTL */
2428
2429 /*
2430 * No sense putting this after each symbol definition, twice,
2431 * exception granted :-)
2432 */
2433 EXPORT_SYMBOL(proc_dointvec);
2434 EXPORT_SYMBOL(proc_dointvec_jiffies);
2435 EXPORT_SYMBOL(proc_dointvec_minmax);
2436 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2437 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2438 EXPORT_SYMBOL(proc_dostring);
2439 EXPORT_SYMBOL(proc_doulongvec_minmax);
2440 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
2441 EXPORT_SYMBOL(register_sysctl_table);
2442 EXPORT_SYMBOL(sysctl_intvec);
2443 EXPORT_SYMBOL(sysctl_jiffies);
2444 EXPORT_SYMBOL(sysctl_ms_jiffies);
2445 EXPORT_SYMBOL(sysctl_string);
2446 EXPORT_SYMBOL(unregister_sysctl_table);
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree