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[PATCH] proc: sysctl: add _proc_do_string helper
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / kernel / sysctl.c
blob8b5f4bb8ad2f305cc34d2fa45f02c2f71a45402a
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/module.h>
22 #include <linux/mm.h>
23 #include <linux/swap.h>
24 #include <linux/slab.h>
25 #include <linux/sysctl.h>
26 #include <linux/proc_fs.h>
27 #include <linux/capability.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/kobject.h>
35 #include <linux/net.h>
36 #include <linux/sysrq.h>
37 #include <linux/highuid.h>
38 #include <linux/writeback.h>
39 #include <linux/hugetlb.h>
40 #include <linux/security.h>
41 #include <linux/initrd.h>
42 #include <linux/times.h>
43 #include <linux/limits.h>
44 #include <linux/dcache.h>
45 #include <linux/syscalls.h>
46 #include <linux/nfs_fs.h>
47 #include <linux/acpi.h>
48
49 #include <asm/uaccess.h>
50 #include <asm/processor.h>
51
52 extern int proc_nr_files(ctl_table *table, int write, struct file *filp,
53 void __user *buffer, size_t *lenp, loff_t *ppos);
54
55 #ifdef CONFIG_X86
56 #include <asm/nmi.h>
57 #endif
58
59 #if defined(CONFIG_SYSCTL)
60
61 /* External variables not in a header file. */
62 extern int C_A_D;
63 extern int sysctl_overcommit_memory;
64 extern int sysctl_overcommit_ratio;
65 extern int sysctl_panic_on_oom;
66 extern int max_threads;
67 extern int sysrq_enabled;
68 extern int core_uses_pid;
69 extern int suid_dumpable;
70 extern char core_pattern[];
71 extern int cad_pid;
72 extern int pid_max;
73 extern int min_free_kbytes;
74 extern int printk_ratelimit_jiffies;
75 extern int printk_ratelimit_burst;
76 extern int pid_max_min, pid_max_max;
77 extern int sysctl_drop_caches;
78 extern int percpu_pagelist_fraction;
79 extern int compat_log;
80
81 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
82 static int maxolduid = 65535;
83 static int minolduid;
84 static int min_percpu_pagelist_fract = 8;
85
86 static int ngroups_max = NGROUPS_MAX;
87
88 #ifdef CONFIG_KMOD
89 extern char modprobe_path[];
90 #endif
91 #ifdef CONFIG_CHR_DEV_SG
92 extern int sg_big_buff;
93 #endif
94 #ifdef CONFIG_SYSVIPC
95 extern size_t shm_ctlmax;
96 extern size_t shm_ctlall;
97 extern int shm_ctlmni;
98 extern int msg_ctlmax;
99 extern int msg_ctlmnb;
100 extern int msg_ctlmni;
101 extern int sem_ctls[];
102 #endif
103
104 #ifdef __sparc__
105 extern char reboot_command [];
106 extern int stop_a_enabled;
107 extern int scons_pwroff;
108 #endif
109
110 #ifdef __hppa__
111 extern int pwrsw_enabled;
112 extern int unaligned_enabled;
113 #endif
114
115 #ifdef CONFIG_S390
116 #ifdef CONFIG_MATHEMU
117 extern int sysctl_ieee_emulation_warnings;
118 #endif
119 extern int sysctl_userprocess_debug;
120 extern int spin_retry;
121 #endif
122
123 extern int sysctl_hz_timer;
124
125 #ifdef CONFIG_BSD_PROCESS_ACCT
126 extern int acct_parm[];
127 #endif
128
129 #ifdef CONFIG_IA64
130 extern int no_unaligned_warning;
131 #endif
132
133 #ifdef CONFIG_RT_MUTEXES
134 extern int max_lock_depth;
135 #endif
136
137 #ifdef CONFIG_SYSCTL_SYSCALL
138 static int parse_table(int __user *, int, void __user *, size_t __user *,
139 void __user *, size_t, ctl_table *, void **);
140 #endif
141
142 static int proc_doutsstring(ctl_table *table, int write, struct file *filp,
143 void __user *buffer, size_t *lenp, loff_t *ppos);
144
145 static ctl_table root_table[];
146 static struct ctl_table_header root_table_header =
147 { root_table, LIST_HEAD_INIT(root_table_header.ctl_entry) };
148
149 static ctl_table kern_table[];
150 static ctl_table vm_table[];
151 static ctl_table fs_table[];
152 static ctl_table debug_table[];
153 static ctl_table dev_table[];
154 extern ctl_table random_table[];
155 #ifdef CONFIG_UNIX98_PTYS
156 extern ctl_table pty_table[];
157 #endif
158 #ifdef CONFIG_INOTIFY_USER
159 extern ctl_table inotify_table[];
160 #endif
161
162 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
163 int sysctl_legacy_va_layout;
164 #endif
165
166 /* /proc declarations: */
167
168 #ifdef CONFIG_PROC_SYSCTL
169
170 static ssize_t proc_readsys(struct file *, char __user *, size_t, loff_t *);
171 static ssize_t proc_writesys(struct file *, const char __user *, size_t, loff_t *);
172 static int proc_opensys(struct inode *, struct file *);
173
174 struct file_operations proc_sys_file_operations = {
175 .open = proc_opensys,
176 .read = proc_readsys,
177 .write = proc_writesys,
178 };
179
180 extern struct proc_dir_entry *proc_sys_root;
181
182 static void register_proc_table(ctl_table *, struct proc_dir_entry *, void *);
183 static void unregister_proc_table(ctl_table *, struct proc_dir_entry *);
184 #endif
185
186 /* The default sysctl tables: */
187
188 static ctl_table root_table[] = {
189 {
190 .ctl_name = CTL_KERN,
191 .procname = "kernel",
192 .mode = 0555,
193 .child = kern_table,
194 },
195 {
196 .ctl_name = CTL_VM,
197 .procname = "vm",
198 .mode = 0555,
199 .child = vm_table,
200 },
201 #ifdef CONFIG_NET
202 {
203 .ctl_name = CTL_NET,
204 .procname = "net",
205 .mode = 0555,
206 .child = net_table,
207 },
208 #endif
209 {
210 .ctl_name = CTL_FS,
211 .procname = "fs",
212 .mode = 0555,
213 .child = fs_table,
214 },
215 {
216 .ctl_name = CTL_DEBUG,
217 .procname = "debug",
218 .mode = 0555,
219 .child = debug_table,
220 },
221 {
222 .ctl_name = CTL_DEV,
223 .procname = "dev",
224 .mode = 0555,
225 .child = dev_table,
226 },
227
228 { .ctl_name = 0 }
229 };
230
231 static ctl_table kern_table[] = {
232 {
233 .ctl_name = KERN_OSTYPE,
234 .procname = "ostype",
235 .data = system_utsname.sysname,
236 .maxlen = sizeof(system_utsname.sysname),
237 .mode = 0444,
238 .proc_handler = &proc_doutsstring,
239 .strategy = &sysctl_string,
240 },
241 {
242 .ctl_name = KERN_OSRELEASE,
243 .procname = "osrelease",
244 .data = system_utsname.release,
245 .maxlen = sizeof(system_utsname.release),
246 .mode = 0444,
247 .proc_handler = &proc_doutsstring,
248 .strategy = &sysctl_string,
249 },
250 {
251 .ctl_name = KERN_VERSION,
252 .procname = "version",
253 .data = system_utsname.version,
254 .maxlen = sizeof(system_utsname.version),
255 .mode = 0444,
256 .proc_handler = &proc_doutsstring,
257 .strategy = &sysctl_string,
258 },
259 {
260 .ctl_name = KERN_NODENAME,
261 .procname = "hostname",
262 .data = system_utsname.nodename,
263 .maxlen = sizeof(system_utsname.nodename),
264 .mode = 0644,
265 .proc_handler = &proc_doutsstring,
266 .strategy = &sysctl_string,
267 },
268 {
269 .ctl_name = KERN_DOMAINNAME,
270 .procname = "domainname",
271 .data = system_utsname.domainname,
272 .maxlen = sizeof(system_utsname.domainname),
273 .mode = 0644,
274 .proc_handler = &proc_doutsstring,
275 .strategy = &sysctl_string,
276 },
277 {
278 .ctl_name = KERN_PANIC,
279 .procname = "panic",
280 .data = &panic_timeout,
281 .maxlen = sizeof(int),
282 .mode = 0644,
283 .proc_handler = &proc_dointvec,
284 },
285 {
286 .ctl_name = KERN_CORE_USES_PID,
287 .procname = "core_uses_pid",
288 .data = &core_uses_pid,
289 .maxlen = sizeof(int),
290 .mode = 0644,
291 .proc_handler = &proc_dointvec,
292 },
293 {
294 .ctl_name = KERN_CORE_PATTERN,
295 .procname = "core_pattern",
296 .data = core_pattern,
297 .maxlen = 128,
298 .mode = 0644,
299 .proc_handler = &proc_dostring,
300 .strategy = &sysctl_string,
301 },
302 {
303 .ctl_name = KERN_TAINTED,
304 .procname = "tainted",
305 .data = &tainted,
306 .maxlen = sizeof(int),
307 .mode = 0444,
308 .proc_handler = &proc_dointvec,
309 },
310 {
311 .ctl_name = KERN_CAP_BSET,
312 .procname = "cap-bound",
313 .data = &cap_bset,
314 .maxlen = sizeof(kernel_cap_t),
315 .mode = 0600,
316 .proc_handler = &proc_dointvec_bset,
317 },
318 #ifdef CONFIG_BLK_DEV_INITRD
319 {
320 .ctl_name = KERN_REALROOTDEV,
321 .procname = "real-root-dev",
322 .data = &real_root_dev,
323 .maxlen = sizeof(int),
324 .mode = 0644,
325 .proc_handler = &proc_dointvec,
326 },
327 #endif
328 #ifdef __sparc__
329 {
330 .ctl_name = KERN_SPARC_REBOOT,
331 .procname = "reboot-cmd",
332 .data = reboot_command,
333 .maxlen = 256,
334 .mode = 0644,
335 .proc_handler = &proc_dostring,
336 .strategy = &sysctl_string,
337 },
338 {
339 .ctl_name = KERN_SPARC_STOP_A,
340 .procname = "stop-a",
341 .data = &stop_a_enabled,
342 .maxlen = sizeof (int),
343 .mode = 0644,
344 .proc_handler = &proc_dointvec,
345 },
346 {
347 .ctl_name = KERN_SPARC_SCONS_PWROFF,
348 .procname = "scons-poweroff",
349 .data = &scons_pwroff,
350 .maxlen = sizeof (int),
351 .mode = 0644,
352 .proc_handler = &proc_dointvec,
353 },
354 #endif
355 #ifdef __hppa__
356 {
357 .ctl_name = KERN_HPPA_PWRSW,
358 .procname = "soft-power",
359 .data = &pwrsw_enabled,
360 .maxlen = sizeof (int),
361 .mode = 0644,
362 .proc_handler = &proc_dointvec,
363 },
364 {
365 .ctl_name = KERN_HPPA_UNALIGNED,
366 .procname = "unaligned-trap",
367 .data = &unaligned_enabled,
368 .maxlen = sizeof (int),
369 .mode = 0644,
370 .proc_handler = &proc_dointvec,
371 },
372 #endif
373 {
374 .ctl_name = KERN_CTLALTDEL,
375 .procname = "ctrl-alt-del",
376 .data = &C_A_D,
377 .maxlen = sizeof(int),
378 .mode = 0644,
379 .proc_handler = &proc_dointvec,
380 },
381 {
382 .ctl_name = KERN_PRINTK,
383 .procname = "printk",
384 .data = &console_loglevel,
385 .maxlen = 4*sizeof(int),
386 .mode = 0644,
387 .proc_handler = &proc_dointvec,
388 },
389 #ifdef CONFIG_KMOD
390 {
391 .ctl_name = KERN_MODPROBE,
392 .procname = "modprobe",
393 .data = &modprobe_path,
394 .maxlen = KMOD_PATH_LEN,
395 .mode = 0644,
396 .proc_handler = &proc_dostring,
397 .strategy = &sysctl_string,
398 },
399 #endif
400 #if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET)
401 {
402 .ctl_name = KERN_HOTPLUG,
403 .procname = "hotplug",
404 .data = &uevent_helper,
405 .maxlen = UEVENT_HELPER_PATH_LEN,
406 .mode = 0644,
407 .proc_handler = &proc_dostring,
408 .strategy = &sysctl_string,
409 },
410 #endif
411 #ifdef CONFIG_CHR_DEV_SG
412 {
413 .ctl_name = KERN_SG_BIG_BUFF,
414 .procname = "sg-big-buff",
415 .data = &sg_big_buff,
416 .maxlen = sizeof (int),
417 .mode = 0444,
418 .proc_handler = &proc_dointvec,
419 },
420 #endif
421 #ifdef CONFIG_BSD_PROCESS_ACCT
422 {
423 .ctl_name = KERN_ACCT,
424 .procname = "acct",
425 .data = &acct_parm,
426 .maxlen = 3*sizeof(int),
427 .mode = 0644,
428 .proc_handler = &proc_dointvec,
429 },
430 #endif
431 #ifdef CONFIG_SYSVIPC
432 {
433 .ctl_name = KERN_SHMMAX,
434 .procname = "shmmax",
435 .data = &shm_ctlmax,
436 .maxlen = sizeof (size_t),
437 .mode = 0644,
438 .proc_handler = &proc_doulongvec_minmax,
439 },
440 {
441 .ctl_name = KERN_SHMALL,
442 .procname = "shmall",
443 .data = &shm_ctlall,
444 .maxlen = sizeof (size_t),
445 .mode = 0644,
446 .proc_handler = &proc_doulongvec_minmax,
447 },
448 {
449 .ctl_name = KERN_SHMMNI,
450 .procname = "shmmni",
451 .data = &shm_ctlmni,
452 .maxlen = sizeof (int),
453 .mode = 0644,
454 .proc_handler = &proc_dointvec,
455 },
456 {
457 .ctl_name = KERN_MSGMAX,
458 .procname = "msgmax",
459 .data = &msg_ctlmax,
460 .maxlen = sizeof (int),
461 .mode = 0644,
462 .proc_handler = &proc_dointvec,
463 },
464 {
465 .ctl_name = KERN_MSGMNI,
466 .procname = "msgmni",
467 .data = &msg_ctlmni,
468 .maxlen = sizeof (int),
469 .mode = 0644,
470 .proc_handler = &proc_dointvec,
471 },
472 {
473 .ctl_name = KERN_MSGMNB,
474 .procname = "msgmnb",
475 .data = &msg_ctlmnb,
476 .maxlen = sizeof (int),
477 .mode = 0644,
478 .proc_handler = &proc_dointvec,
479 },
480 {
481 .ctl_name = KERN_SEM,
482 .procname = "sem",
483 .data = &sem_ctls,
484 .maxlen = 4*sizeof (int),
485 .mode = 0644,
486 .proc_handler = &proc_dointvec,
487 },
488 #endif
489 #ifdef CONFIG_MAGIC_SYSRQ
490 {
491 .ctl_name = KERN_SYSRQ,
492 .procname = "sysrq",
493 .data = &sysrq_enabled,
494 .maxlen = sizeof (int),
495 .mode = 0644,
496 .proc_handler = &proc_dointvec,
497 },
498 #endif
499 {
500 .ctl_name = KERN_CADPID,
501 .procname = "cad_pid",
502 .data = &cad_pid,
503 .maxlen = sizeof (int),
504 .mode = 0600,
505 .proc_handler = &proc_dointvec,
506 },
507 {
508 .ctl_name = KERN_MAX_THREADS,
509 .procname = "threads-max",
510 .data = &max_threads,
511 .maxlen = sizeof(int),
512 .mode = 0644,
513 .proc_handler = &proc_dointvec,
514 },
515 {
516 .ctl_name = KERN_RANDOM,
517 .procname = "random",
518 .mode = 0555,
519 .child = random_table,
520 },
521 #ifdef CONFIG_UNIX98_PTYS
522 {
523 .ctl_name = KERN_PTY,
524 .procname = "pty",
525 .mode = 0555,
526 .child = pty_table,
527 },
528 #endif
529 {
530 .ctl_name = KERN_OVERFLOWUID,
531 .procname = "overflowuid",
532 .data = &overflowuid,
533 .maxlen = sizeof(int),
534 .mode = 0644,
535 .proc_handler = &proc_dointvec_minmax,
536 .strategy = &sysctl_intvec,
537 .extra1 = &minolduid,
538 .extra2 = &maxolduid,
539 },
540 {
541 .ctl_name = KERN_OVERFLOWGID,
542 .procname = "overflowgid",
543 .data = &overflowgid,
544 .maxlen = sizeof(int),
545 .mode = 0644,
546 .proc_handler = &proc_dointvec_minmax,
547 .strategy = &sysctl_intvec,
548 .extra1 = &minolduid,
549 .extra2 = &maxolduid,
550 },
551 #ifdef CONFIG_S390
552 #ifdef CONFIG_MATHEMU
553 {
554 .ctl_name = KERN_IEEE_EMULATION_WARNINGS,
555 .procname = "ieee_emulation_warnings",
556 .data = &sysctl_ieee_emulation_warnings,
557 .maxlen = sizeof(int),
558 .mode = 0644,
559 .proc_handler = &proc_dointvec,
560 },
561 #endif
562 #ifdef CONFIG_NO_IDLE_HZ
563 {
564 .ctl_name = KERN_HZ_TIMER,
565 .procname = "hz_timer",
566 .data = &sysctl_hz_timer,
567 .maxlen = sizeof(int),
568 .mode = 0644,
569 .proc_handler = &proc_dointvec,
570 },
571 #endif
572 {
573 .ctl_name = KERN_S390_USER_DEBUG_LOGGING,
574 .procname = "userprocess_debug",
575 .data = &sysctl_userprocess_debug,
576 .maxlen = sizeof(int),
577 .mode = 0644,
578 .proc_handler = &proc_dointvec,
579 },
580 #endif
581 {
582 .ctl_name = KERN_PIDMAX,
583 .procname = "pid_max",
584 .data = &pid_max,
585 .maxlen = sizeof (int),
586 .mode = 0644,
587 .proc_handler = &proc_dointvec_minmax,
588 .strategy = sysctl_intvec,
589 .extra1 = &pid_max_min,
590 .extra2 = &pid_max_max,
591 },
592 {
593 .ctl_name = KERN_PANIC_ON_OOPS,
594 .procname = "panic_on_oops",
595 .data = &panic_on_oops,
596 .maxlen = sizeof(int),
597 .mode = 0644,
598 .proc_handler = &proc_dointvec,
599 },
600 {
601 .ctl_name = KERN_PRINTK_RATELIMIT,
602 .procname = "printk_ratelimit",
603 .data = &printk_ratelimit_jiffies,
604 .maxlen = sizeof(int),
605 .mode = 0644,
606 .proc_handler = &proc_dointvec_jiffies,
607 .strategy = &sysctl_jiffies,
608 },
609 {
610 .ctl_name = KERN_PRINTK_RATELIMIT_BURST,
611 .procname = "printk_ratelimit_burst",
612 .data = &printk_ratelimit_burst,
613 .maxlen = sizeof(int),
614 .mode = 0644,
615 .proc_handler = &proc_dointvec,
616 },
617 {
618 .ctl_name = KERN_NGROUPS_MAX,
619 .procname = "ngroups_max",
620 .data = &ngroups_max,
621 .maxlen = sizeof (int),
622 .mode = 0444,
623 .proc_handler = &proc_dointvec,
624 },
625 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
626 {
627 .ctl_name = KERN_UNKNOWN_NMI_PANIC,
628 .procname = "unknown_nmi_panic",
629 .data = &unknown_nmi_panic,
630 .maxlen = sizeof (int),
631 .mode = 0644,
632 .proc_handler = &proc_dointvec,
633 },
634 {
635 .ctl_name = KERN_NMI_WATCHDOG,
636 .procname = "nmi_watchdog",
637 .data = &nmi_watchdog_enabled,
638 .maxlen = sizeof (int),
639 .mode = 0644,
640 .proc_handler = &proc_nmi_enabled,
641 },
642 #endif
643 #if defined(CONFIG_X86)
644 {
645 .ctl_name = KERN_PANIC_ON_NMI,
646 .procname = "panic_on_unrecovered_nmi",
647 .data = &panic_on_unrecovered_nmi,
648 .maxlen = sizeof(int),
649 .mode = 0644,
650 .proc_handler = &proc_dointvec,
651 },
652 {
653 .ctl_name = KERN_BOOTLOADER_TYPE,
654 .procname = "bootloader_type",
655 .data = &bootloader_type,
656 .maxlen = sizeof (int),
657 .mode = 0444,
658 .proc_handler = &proc_dointvec,
659 },
660 #endif
661 #if defined(CONFIG_MMU)
662 {
663 .ctl_name = KERN_RANDOMIZE,
664 .procname = "randomize_va_space",
665 .data = &randomize_va_space,
666 .maxlen = sizeof(int),
667 .mode = 0644,
668 .proc_handler = &proc_dointvec,
669 },
670 #endif
671 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
672 {
673 .ctl_name = KERN_SPIN_RETRY,
674 .procname = "spin_retry",
675 .data = &spin_retry,
676 .maxlen = sizeof (int),
677 .mode = 0644,
678 .proc_handler = &proc_dointvec,
679 },
680 #endif
681 #ifdef CONFIG_ACPI_SLEEP
682 {
683 .ctl_name = KERN_ACPI_VIDEO_FLAGS,
684 .procname = "acpi_video_flags",
685 .data = &acpi_video_flags,
686 .maxlen = sizeof (unsigned long),
687 .mode = 0644,
688 .proc_handler = &proc_doulongvec_minmax,
689 },
690 #endif
691 #ifdef CONFIG_IA64
692 {
693 .ctl_name = KERN_IA64_UNALIGNED,
694 .procname = "ignore-unaligned-usertrap",
695 .data = &no_unaligned_warning,
696 .maxlen = sizeof (int),
697 .mode = 0644,
698 .proc_handler = &proc_dointvec,
699 },
700 #endif
701 #ifdef CONFIG_COMPAT
702 {
703 .ctl_name = KERN_COMPAT_LOG,
704 .procname = "compat-log",
705 .data = &compat_log,
706 .maxlen = sizeof (int),
707 .mode = 0644,
708 .proc_handler = &proc_dointvec,
709 },
710 #endif
711 #ifdef CONFIG_RT_MUTEXES
712 {
713 .ctl_name = KERN_MAX_LOCK_DEPTH,
714 .procname = "max_lock_depth",
715 .data = &max_lock_depth,
716 .maxlen = sizeof(int),
717 .mode = 0644,
718 .proc_handler = &proc_dointvec,
719 },
720 #endif
721
722 { .ctl_name = 0 }
723 };
724
725 /* Constants for minimum and maximum testing in vm_table.
726 We use these as one-element integer vectors. */
727 static int zero;
728 static int one_hundred = 100;
729
730
731 static ctl_table vm_table[] = {
732 {
733 .ctl_name = VM_OVERCOMMIT_MEMORY,
734 .procname = "overcommit_memory",
735 .data = &sysctl_overcommit_memory,
736 .maxlen = sizeof(sysctl_overcommit_memory),
737 .mode = 0644,
738 .proc_handler = &proc_dointvec,
739 },
740 {
741 .ctl_name = VM_PANIC_ON_OOM,
742 .procname = "panic_on_oom",
743 .data = &sysctl_panic_on_oom,
744 .maxlen = sizeof(sysctl_panic_on_oom),
745 .mode = 0644,
746 .proc_handler = &proc_dointvec,
747 },
748 {
749 .ctl_name = VM_OVERCOMMIT_RATIO,
750 .procname = "overcommit_ratio",
751 .data = &sysctl_overcommit_ratio,
752 .maxlen = sizeof(sysctl_overcommit_ratio),
753 .mode = 0644,
754 .proc_handler = &proc_dointvec,
755 },
756 {
757 .ctl_name = VM_PAGE_CLUSTER,
758 .procname = "page-cluster",
759 .data = &page_cluster,
760 .maxlen = sizeof(int),
761 .mode = 0644,
762 .proc_handler = &proc_dointvec,
763 },
764 {
765 .ctl_name = VM_DIRTY_BACKGROUND,
766 .procname = "dirty_background_ratio",
767 .data = &dirty_background_ratio,
768 .maxlen = sizeof(dirty_background_ratio),
769 .mode = 0644,
770 .proc_handler = &proc_dointvec_minmax,
771 .strategy = &sysctl_intvec,
772 .extra1 = &zero,
773 .extra2 = &one_hundred,
774 },
775 {
776 .ctl_name = VM_DIRTY_RATIO,
777 .procname = "dirty_ratio",
778 .data = &vm_dirty_ratio,
779 .maxlen = sizeof(vm_dirty_ratio),
780 .mode = 0644,
781 .proc_handler = &proc_dointvec_minmax,
782 .strategy = &sysctl_intvec,
783 .extra1 = &zero,
784 .extra2 = &one_hundred,
785 },
786 {
787 .ctl_name = VM_DIRTY_WB_CS,
788 .procname = "dirty_writeback_centisecs",
789 .data = &dirty_writeback_interval,
790 .maxlen = sizeof(dirty_writeback_interval),
791 .mode = 0644,
792 .proc_handler = &dirty_writeback_centisecs_handler,
793 },
794 {
795 .ctl_name = VM_DIRTY_EXPIRE_CS,
796 .procname = "dirty_expire_centisecs",
797 .data = &dirty_expire_interval,
798 .maxlen = sizeof(dirty_expire_interval),
799 .mode = 0644,
800 .proc_handler = &proc_dointvec_userhz_jiffies,
801 },
802 {
803 .ctl_name = VM_NR_PDFLUSH_THREADS,
804 .procname = "nr_pdflush_threads",
805 .data = &nr_pdflush_threads,
806 .maxlen = sizeof nr_pdflush_threads,
807 .mode = 0444 /* read-only*/,
808 .proc_handler = &proc_dointvec,
809 },
810 {
811 .ctl_name = VM_SWAPPINESS,
812 .procname = "swappiness",
813 .data = &vm_swappiness,
814 .maxlen = sizeof(vm_swappiness),
815 .mode = 0644,
816 .proc_handler = &proc_dointvec_minmax,
817 .strategy = &sysctl_intvec,
818 .extra1 = &zero,
819 .extra2 = &one_hundred,
820 },
821 #ifdef CONFIG_HUGETLB_PAGE
822 {
823 .ctl_name = VM_HUGETLB_PAGES,
824 .procname = "nr_hugepages",
825 .data = &max_huge_pages,
826 .maxlen = sizeof(unsigned long),
827 .mode = 0644,
828 .proc_handler = &hugetlb_sysctl_handler,
829 .extra1 = (void *)&hugetlb_zero,
830 .extra2 = (void *)&hugetlb_infinity,
831 },
832 {
833 .ctl_name = VM_HUGETLB_GROUP,
834 .procname = "hugetlb_shm_group",
835 .data = &sysctl_hugetlb_shm_group,
836 .maxlen = sizeof(gid_t),
837 .mode = 0644,
838 .proc_handler = &proc_dointvec,
839 },
840 #endif
841 {
842 .ctl_name = VM_LOWMEM_RESERVE_RATIO,
843 .procname = "lowmem_reserve_ratio",
844 .data = &sysctl_lowmem_reserve_ratio,
845 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
846 .mode = 0644,
847 .proc_handler = &lowmem_reserve_ratio_sysctl_handler,
848 .strategy = &sysctl_intvec,
849 },
850 {
851 .ctl_name = VM_DROP_PAGECACHE,
852 .procname = "drop_caches",
853 .data = &sysctl_drop_caches,
854 .maxlen = sizeof(int),
855 .mode = 0644,
856 .proc_handler = drop_caches_sysctl_handler,
857 .strategy = &sysctl_intvec,
858 },
859 {
860 .ctl_name = VM_MIN_FREE_KBYTES,
861 .procname = "min_free_kbytes",
862 .data = &min_free_kbytes,
863 .maxlen = sizeof(min_free_kbytes),
864 .mode = 0644,
865 .proc_handler = &min_free_kbytes_sysctl_handler,
866 .strategy = &sysctl_intvec,
867 .extra1 = &zero,
868 },
869 {
870 .ctl_name = VM_PERCPU_PAGELIST_FRACTION,
871 .procname = "percpu_pagelist_fraction",
872 .data = &percpu_pagelist_fraction,
873 .maxlen = sizeof(percpu_pagelist_fraction),
874 .mode = 0644,
875 .proc_handler = &percpu_pagelist_fraction_sysctl_handler,
876 .strategy = &sysctl_intvec,
877 .extra1 = &min_percpu_pagelist_fract,
878 },
879 #ifdef CONFIG_MMU
880 {
881 .ctl_name = VM_MAX_MAP_COUNT,
882 .procname = "max_map_count",
883 .data = &sysctl_max_map_count,
884 .maxlen = sizeof(sysctl_max_map_count),
885 .mode = 0644,
886 .proc_handler = &proc_dointvec
887 },
888 #endif
889 {
890 .ctl_name = VM_LAPTOP_MODE,
891 .procname = "laptop_mode",
892 .data = &laptop_mode,
893 .maxlen = sizeof(laptop_mode),
894 .mode = 0644,
895 .proc_handler = &proc_dointvec_jiffies,
896 .strategy = &sysctl_jiffies,
897 },
898 {
899 .ctl_name = VM_BLOCK_DUMP,
900 .procname = "block_dump",
901 .data = &block_dump,
902 .maxlen = sizeof(block_dump),
903 .mode = 0644,
904 .proc_handler = &proc_dointvec,
905 .strategy = &sysctl_intvec,
906 .extra1 = &zero,
907 },
908 {
909 .ctl_name = VM_VFS_CACHE_PRESSURE,
910 .procname = "vfs_cache_pressure",
911 .data = &sysctl_vfs_cache_pressure,
912 .maxlen = sizeof(sysctl_vfs_cache_pressure),
913 .mode = 0644,
914 .proc_handler = &proc_dointvec,
915 .strategy = &sysctl_intvec,
916 .extra1 = &zero,
917 },
918 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
919 {
920 .ctl_name = VM_LEGACY_VA_LAYOUT,
921 .procname = "legacy_va_layout",
922 .data = &sysctl_legacy_va_layout,
923 .maxlen = sizeof(sysctl_legacy_va_layout),
924 .mode = 0644,
925 .proc_handler = &proc_dointvec,
926 .strategy = &sysctl_intvec,
927 .extra1 = &zero,
928 },
929 #endif
930 #ifdef CONFIG_SWAP
931 {
932 .ctl_name = VM_SWAP_TOKEN_TIMEOUT,
933 .procname = "swap_token_timeout",
934 .data = &swap_token_default_timeout,
935 .maxlen = sizeof(swap_token_default_timeout),
936 .mode = 0644,
937 .proc_handler = &proc_dointvec_jiffies,
938 .strategy = &sysctl_jiffies,
939 },
940 #endif
941 #ifdef CONFIG_NUMA
942 {
943 .ctl_name = VM_ZONE_RECLAIM_MODE,
944 .procname = "zone_reclaim_mode",
945 .data = &zone_reclaim_mode,
946 .maxlen = sizeof(zone_reclaim_mode),
947 .mode = 0644,
948 .proc_handler = &proc_dointvec,
949 .strategy = &sysctl_intvec,
950 .extra1 = &zero,
951 },
952 {
953 .ctl_name = VM_MIN_UNMAPPED,
954 .procname = "min_unmapped_ratio",
955 .data = &sysctl_min_unmapped_ratio,
956 .maxlen = sizeof(sysctl_min_unmapped_ratio),
957 .mode = 0644,
958 .proc_handler = &sysctl_min_unmapped_ratio_sysctl_handler,
959 .strategy = &sysctl_intvec,
960 .extra1 = &zero,
961 .extra2 = &one_hundred,
962 },
963 {
964 .ctl_name = VM_MIN_SLAB,
965 .procname = "min_slab_ratio",
966 .data = &sysctl_min_slab_ratio,
967 .maxlen = sizeof(sysctl_min_slab_ratio),
968 .mode = 0644,
969 .proc_handler = &sysctl_min_slab_ratio_sysctl_handler,
970 .strategy = &sysctl_intvec,
971 .extra1 = &zero,
972 .extra2 = &one_hundred,
973 },
974 #endif
975 #ifdef CONFIG_X86_32
976 {
977 .ctl_name = VM_VDSO_ENABLED,
978 .procname = "vdso_enabled",
979 .data = &vdso_enabled,
980 .maxlen = sizeof(vdso_enabled),
981 .mode = 0644,
982 .proc_handler = &proc_dointvec,
983 .strategy = &sysctl_intvec,
984 .extra1 = &zero,
985 },
986 #endif
987 { .ctl_name = 0 }
988 };
989
990 static ctl_table fs_table[] = {
991 {
992 .ctl_name = FS_NRINODE,
993 .procname = "inode-nr",
994 .data = &inodes_stat,
995 .maxlen = 2*sizeof(int),
996 .mode = 0444,
997 .proc_handler = &proc_dointvec,
998 },
999 {
1000 .ctl_name = FS_STATINODE,
1001 .procname = "inode-state",
1002 .data = &inodes_stat,
1003 .maxlen = 7*sizeof(int),
1004 .mode = 0444,
1005 .proc_handler = &proc_dointvec,
1006 },
1007 {
1008 .ctl_name = FS_NRFILE,
1009 .procname = "file-nr",
1010 .data = &files_stat,
1011 .maxlen = 3*sizeof(int),
1012 .mode = 0444,
1013 .proc_handler = &proc_nr_files,
1014 },
1015 {
1016 .ctl_name = FS_MAXFILE,
1017 .procname = "file-max",
1018 .data = &files_stat.max_files,
1019 .maxlen = sizeof(int),
1020 .mode = 0644,
1021 .proc_handler = &proc_dointvec,
1022 },
1023 {
1024 .ctl_name = FS_DENTRY,
1025 .procname = "dentry-state",
1026 .data = &dentry_stat,
1027 .maxlen = 6*sizeof(int),
1028 .mode = 0444,
1029 .proc_handler = &proc_dointvec,
1030 },
1031 {
1032 .ctl_name = FS_OVERFLOWUID,
1033 .procname = "overflowuid",
1034 .data = &fs_overflowuid,
1035 .maxlen = sizeof(int),
1036 .mode = 0644,
1037 .proc_handler = &proc_dointvec_minmax,
1038 .strategy = &sysctl_intvec,
1039 .extra1 = &minolduid,
1040 .extra2 = &maxolduid,
1041 },
1042 {
1043 .ctl_name = FS_OVERFLOWGID,
1044 .procname = "overflowgid",
1045 .data = &fs_overflowgid,
1046 .maxlen = sizeof(int),
1047 .mode = 0644,
1048 .proc_handler = &proc_dointvec_minmax,
1049 .strategy = &sysctl_intvec,
1050 .extra1 = &minolduid,
1051 .extra2 = &maxolduid,
1052 },
1053 {
1054 .ctl_name = FS_LEASES,
1055 .procname = "leases-enable",
1056 .data = &leases_enable,
1057 .maxlen = sizeof(int),
1058 .mode = 0644,
1059 .proc_handler = &proc_dointvec,
1060 },
1061 #ifdef CONFIG_DNOTIFY
1062 {
1063 .ctl_name = FS_DIR_NOTIFY,
1064 .procname = "dir-notify-enable",
1065 .data = &dir_notify_enable,
1066 .maxlen = sizeof(int),
1067 .mode = 0644,
1068 .proc_handler = &proc_dointvec,
1069 },
1070 #endif
1071 #ifdef CONFIG_MMU
1072 {
1073 .ctl_name = FS_LEASE_TIME,
1074 .procname = "lease-break-time",
1075 .data = &lease_break_time,
1076 .maxlen = sizeof(int),
1077 .mode = 0644,
1078 .proc_handler = &proc_dointvec,
1079 },
1080 {
1081 .ctl_name = FS_AIO_NR,
1082 .procname = "aio-nr",
1083 .data = &aio_nr,
1084 .maxlen = sizeof(aio_nr),
1085 .mode = 0444,
1086 .proc_handler = &proc_doulongvec_minmax,
1087 },
1088 {
1089 .ctl_name = FS_AIO_MAX_NR,
1090 .procname = "aio-max-nr",
1091 .data = &aio_max_nr,
1092 .maxlen = sizeof(aio_max_nr),
1093 .mode = 0644,
1094 .proc_handler = &proc_doulongvec_minmax,
1095 },
1096 #ifdef CONFIG_INOTIFY_USER
1097 {
1098 .ctl_name = FS_INOTIFY,
1099 .procname = "inotify",
1100 .mode = 0555,
1101 .child = inotify_table,
1102 },
1103 #endif
1104 #endif
1105 {
1106 .ctl_name = KERN_SETUID_DUMPABLE,
1107 .procname = "suid_dumpable",
1108 .data = &suid_dumpable,
1109 .maxlen = sizeof(int),
1110 .mode = 0644,
1111 .proc_handler = &proc_dointvec,
1112 },
1113 { .ctl_name = 0 }
1114 };
1115
1116 static ctl_table debug_table[] = {
1117 { .ctl_name = 0 }
1118 };
1119
1120 static ctl_table dev_table[] = {
1121 { .ctl_name = 0 }
1122 };
1123
1124 extern void init_irq_proc (void);
1125
1126 static DEFINE_SPINLOCK(sysctl_lock);
1127
1128 /* called under sysctl_lock */
1129 static int use_table(struct ctl_table_header *p)
1130 {
1131 if (unlikely(p->unregistering))
1132 return 0;
1133 p->used++;
1134 return 1;
1135 }
1136
1137 /* called under sysctl_lock */
1138 static void unuse_table(struct ctl_table_header *p)
1139 {
1140 if (!--p->used)
1141 if (unlikely(p->unregistering))
1142 complete(p->unregistering);
1143 }
1144
1145 /* called under sysctl_lock, will reacquire if has to wait */
1146 static void start_unregistering(struct ctl_table_header *p)
1147 {
1148 /*
1149 * if p->used is 0, nobody will ever touch that entry again;
1150 * we'll eliminate all paths to it before dropping sysctl_lock
1151 */
1152 if (unlikely(p->used)) {
1153 struct completion wait;
1154 init_completion(&wait);
1155 p->unregistering = &wait;
1156 spin_unlock(&sysctl_lock);
1157 wait_for_completion(&wait);
1158 spin_lock(&sysctl_lock);
1159 }
1160 /*
1161 * do not remove from the list until nobody holds it; walking the
1162 * list in do_sysctl() relies on that.
1163 */
1164 list_del_init(&p->ctl_entry);
1165 }
1166
1167 void __init sysctl_init(void)
1168 {
1169 #ifdef CONFIG_PROC_SYSCTL
1170 register_proc_table(root_table, proc_sys_root, &root_table_header);
1171 init_irq_proc();
1172 #endif
1173 }
1174
1175 #ifdef CONFIG_SYSCTL_SYSCALL
1176 int do_sysctl(int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp,
1177 void __user *newval, size_t newlen)
1178 {
1179 struct list_head *tmp;
1180 int error = -ENOTDIR;
1181
1182 if (nlen <= 0 || nlen >= CTL_MAXNAME)
1183 return -ENOTDIR;
1184 if (oldval) {
1185 int old_len;
1186 if (!oldlenp || get_user(old_len, oldlenp))
1187 return -EFAULT;
1188 }
1189 spin_lock(&sysctl_lock);
1190 tmp = &root_table_header.ctl_entry;
1191 do {
1192 struct ctl_table_header *head =
1193 list_entry(tmp, struct ctl_table_header, ctl_entry);
1194 void *context = NULL;
1195
1196 if (!use_table(head))
1197 continue;
1198
1199 spin_unlock(&sysctl_lock);
1200
1201 error = parse_table(name, nlen, oldval, oldlenp,
1202 newval, newlen, head->ctl_table,
1203 &context);
1204 kfree(context);
1205
1206 spin_lock(&sysctl_lock);
1207 unuse_table(head);
1208 if (error != -ENOTDIR)
1209 break;
1210 } while ((tmp = tmp->next) != &root_table_header.ctl_entry);
1211 spin_unlock(&sysctl_lock);
1212 return error;
1213 }
1214
1215 asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
1216 {
1217 struct __sysctl_args tmp;
1218 int error;
1219
1220 if (copy_from_user(&tmp, args, sizeof(tmp)))
1221 return -EFAULT;
1222
1223 lock_kernel();
1224 error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp,
1225 tmp.newval, tmp.newlen);
1226 unlock_kernel();
1227 return error;
1228 }
1229 #endif /* CONFIG_SYSCTL_SYSCALL */
1230
1231 /*
1232 * ctl_perm does NOT grant the superuser all rights automatically, because
1233 * some sysctl variables are readonly even to root.
1234 */
1235
1236 static int test_perm(int mode, int op)
1237 {
1238 if (!current->euid)
1239 mode >>= 6;
1240 else if (in_egroup_p(0))
1241 mode >>= 3;
1242 if ((mode & op & 0007) == op)
1243 return 0;
1244 return -EACCES;
1245 }
1246
1247 static inline int ctl_perm(ctl_table *table, int op)
1248 {
1249 int error;
1250 error = security_sysctl(table, op);
1251 if (error)
1252 return error;
1253 return test_perm(table->mode, op);
1254 }
1255
1256 #ifdef CONFIG_SYSCTL_SYSCALL
1257 static int parse_table(int __user *name, int nlen,
1258 void __user *oldval, size_t __user *oldlenp,
1259 void __user *newval, size_t newlen,
1260 ctl_table *table, void **context)
1261 {
1262 int n;
1263 repeat:
1264 if (!nlen)
1265 return -ENOTDIR;
1266 if (get_user(n, name))
1267 return -EFAULT;
1268 for ( ; table->ctl_name; table++) {
1269 if (n == table->ctl_name || table->ctl_name == CTL_ANY) {
1270 int error;
1271 if (table->child) {
1272 if (ctl_perm(table, 001))
1273 return -EPERM;
1274 if (table->strategy) {
1275 error = table->strategy(
1276 table, name, nlen,
1277 oldval, oldlenp,
1278 newval, newlen, context);
1279 if (error)
1280 return error;
1281 }
1282 name++;
1283 nlen--;
1284 table = table->child;
1285 goto repeat;
1286 }
1287 error = do_sysctl_strategy(table, name, nlen,
1288 oldval, oldlenp,
1289 newval, newlen, context);
1290 return error;
1291 }
1292 }
1293 return -ENOTDIR;
1294 }
1295
1296 /* Perform the actual read/write of a sysctl table entry. */
1297 int do_sysctl_strategy (ctl_table *table,
1298 int __user *name, int nlen,
1299 void __user *oldval, size_t __user *oldlenp,
1300 void __user *newval, size_t newlen, void **context)
1301 {
1302 int op = 0, rc;
1303 size_t len;
1304
1305 if (oldval)
1306 op |= 004;
1307 if (newval)
1308 op |= 002;
1309 if (ctl_perm(table, op))
1310 return -EPERM;
1311
1312 if (table->strategy) {
1313 rc = table->strategy(table, name, nlen, oldval, oldlenp,
1314 newval, newlen, context);
1315 if (rc < 0)
1316 return rc;
1317 if (rc > 0)
1318 return 0;
1319 }
1320
1321 /* If there is no strategy routine, or if the strategy returns
1322 * zero, proceed with automatic r/w */
1323 if (table->data && table->maxlen) {
1324 if (oldval && oldlenp) {
1325 if (get_user(len, oldlenp))
1326 return -EFAULT;
1327 if (len) {
1328 if (len > table->maxlen)
1329 len = table->maxlen;
1330 if(copy_to_user(oldval, table->data, len))
1331 return -EFAULT;
1332 if(put_user(len, oldlenp))
1333 return -EFAULT;
1334 }
1335 }
1336 if (newval && newlen) {
1337 len = newlen;
1338 if (len > table->maxlen)
1339 len = table->maxlen;
1340 if(copy_from_user(table->data, newval, len))
1341 return -EFAULT;
1342 }
1343 }
1344 return 0;
1345 }
1346 #endif /* CONFIG_SYSCTL_SYSCALL */
1347
1348 /**
1349 * register_sysctl_table - register a sysctl hierarchy
1350 * @table: the top-level table structure
1351 * @insert_at_head: whether the entry should be inserted in front or at the end
1352 *
1353 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1354 * array. An entry with a ctl_name of 0 terminates the table.
1355 *
1356 * The members of the &ctl_table structure are used as follows:
1357 *
1358 * ctl_name - This is the numeric sysctl value used by sysctl(2). The number
1359 * must be unique within that level of sysctl
1360 *
1361 * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1362 * enter a sysctl file
1363 *
1364 * data - a pointer to data for use by proc_handler
1365 *
1366 * maxlen - the maximum size in bytes of the data
1367 *
1368 * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1369 *
1370 * child - a pointer to the child sysctl table if this entry is a directory, or
1371 * %NULL.
1372 *
1373 * proc_handler - the text handler routine (described below)
1374 *
1375 * strategy - the strategy routine (described below)
1376 *
1377 * de - for internal use by the sysctl routines
1378 *
1379 * extra1, extra2 - extra pointers usable by the proc handler routines
1380 *
1381 * Leaf nodes in the sysctl tree will be represented by a single file
1382 * under /proc; non-leaf nodes will be represented by directories.
1383 *
1384 * sysctl(2) can automatically manage read and write requests through
1385 * the sysctl table. The data and maxlen fields of the ctl_table
1386 * struct enable minimal validation of the values being written to be
1387 * performed, and the mode field allows minimal authentication.
1388 *
1389 * More sophisticated management can be enabled by the provision of a
1390 * strategy routine with the table entry. This will be called before
1391 * any automatic read or write of the data is performed.
1392 *
1393 * The strategy routine may return
1394 *
1395 * < 0 - Error occurred (error is passed to user process)
1396 *
1397 * 0 - OK - proceed with automatic read or write.
1398 *
1399 * > 0 - OK - read or write has been done by the strategy routine, so
1400 * return immediately.
1401 *
1402 * There must be a proc_handler routine for any terminal nodes
1403 * mirrored under /proc/sys (non-terminals are handled by a built-in
1404 * directory handler). Several default handlers are available to
1405 * cover common cases -
1406 *
1407 * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
1408 * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(),
1409 * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
1410 *
1411 * It is the handler's job to read the input buffer from user memory
1412 * and process it. The handler should return 0 on success.
1413 *
1414 * This routine returns %NULL on a failure to register, and a pointer
1415 * to the table header on success.
1416 */
1417 struct ctl_table_header *register_sysctl_table(ctl_table * table,
1418 int insert_at_head)
1419 {
1420 struct ctl_table_header *tmp;
1421 tmp = kmalloc(sizeof(struct ctl_table_header), GFP_KERNEL);
1422 if (!tmp)
1423 return NULL;
1424 tmp->ctl_table = table;
1425 INIT_LIST_HEAD(&tmp->ctl_entry);
1426 tmp->used = 0;
1427 tmp->unregistering = NULL;
1428 spin_lock(&sysctl_lock);
1429 if (insert_at_head)
1430 list_add(&tmp->ctl_entry, &root_table_header.ctl_entry);
1431 else
1432 list_add_tail(&tmp->ctl_entry, &root_table_header.ctl_entry);
1433 spin_unlock(&sysctl_lock);
1434 #ifdef CONFIG_PROC_SYSCTL
1435 register_proc_table(table, proc_sys_root, tmp);
1436 #endif
1437 return tmp;
1438 }
1439
1440 /**
1441 * unregister_sysctl_table - unregister a sysctl table hierarchy
1442 * @header: the header returned from register_sysctl_table
1443 *
1444 * Unregisters the sysctl table and all children. proc entries may not
1445 * actually be removed until they are no longer used by anyone.
1446 */
1447 void unregister_sysctl_table(struct ctl_table_header * header)
1448 {
1449 might_sleep();
1450 spin_lock(&sysctl_lock);
1451 start_unregistering(header);
1452 #ifdef CONFIG_PROC_SYSCTL
1453 unregister_proc_table(header->ctl_table, proc_sys_root);
1454 #endif
1455 spin_unlock(&sysctl_lock);
1456 kfree(header);
1457 }
1458
1459 #else /* !CONFIG_SYSCTL */
1460 struct ctl_table_header * register_sysctl_table(ctl_table * table,
1461 int insert_at_head)
1462 {
1463 return NULL;
1464 }
1465
1466 void unregister_sysctl_table(struct ctl_table_header * table)
1467 {
1468 }
1469
1470 #endif /* CONFIG_SYSCTL */
1471
1472 /*
1473 * /proc/sys support
1474 */
1475
1476 #ifdef CONFIG_PROC_SYSCTL
1477
1478 /* Scan the sysctl entries in table and add them all into /proc */
1479 static void register_proc_table(ctl_table * table, struct proc_dir_entry *root, void *set)
1480 {
1481 struct proc_dir_entry *de;
1482 int len;
1483 mode_t mode;
1484
1485 for (; table->ctl_name; table++) {
1486 /* Can't do anything without a proc name. */
1487 if (!table->procname)
1488 continue;
1489 /* Maybe we can't do anything with it... */
1490 if (!table->proc_handler && !table->child) {
1491 printk(KERN_WARNING "SYSCTL: Can't register %s\n",
1492 table->procname);
1493 continue;
1494 }
1495
1496 len = strlen(table->procname);
1497 mode = table->mode;
1498
1499 de = NULL;
1500 if (table->proc_handler)
1501 mode |= S_IFREG;
1502 else {
1503 mode |= S_IFDIR;
1504 for (de = root->subdir; de; de = de->next) {
1505 if (proc_match(len, table->procname, de))
1506 break;
1507 }
1508 /* If the subdir exists already, de is non-NULL */
1509 }
1510
1511 if (!de) {
1512 de = create_proc_entry(table->procname, mode, root);
1513 if (!de)
1514 continue;
1515 de->set = set;
1516 de->data = (void *) table;
1517 if (table->proc_handler)
1518 de->proc_fops = &proc_sys_file_operations;
1519 }
1520 table->de = de;
1521 if (de->mode & S_IFDIR)
1522 register_proc_table(table->child, de, set);
1523 }
1524 }
1525
1526 /*
1527 * Unregister a /proc sysctl table and any subdirectories.
1528 */
1529 static void unregister_proc_table(ctl_table * table, struct proc_dir_entry *root)
1530 {
1531 struct proc_dir_entry *de;
1532 for (; table->ctl_name; table++) {
1533 if (!(de = table->de))
1534 continue;
1535 if (de->mode & S_IFDIR) {
1536 if (!table->child) {
1537 printk (KERN_ALERT "Help - malformed sysctl tree on free\n");
1538 continue;
1539 }
1540 unregister_proc_table(table->child, de);
1541
1542 /* Don't unregister directories which still have entries.. */
1543 if (de->subdir)
1544 continue;
1545 }
1546
1547 /*
1548 * In any case, mark the entry as goner; we'll keep it
1549 * around if it's busy, but we'll know to do nothing with
1550 * its fields. We are under sysctl_lock here.
1551 */
1552 de->data = NULL;
1553
1554 /* Don't unregister proc entries that are still being used.. */
1555 if (atomic_read(&de->count))
1556 continue;
1557
1558 table->de = NULL;
1559 remove_proc_entry(table->procname, root);
1560 }
1561 }
1562
1563 static ssize_t do_rw_proc(int write, struct file * file, char __user * buf,
1564 size_t count, loff_t *ppos)
1565 {
1566 int op;
1567 struct proc_dir_entry *de = PDE(file->f_dentry->d_inode);
1568 struct ctl_table *table;
1569 size_t res;
1570 ssize_t error = -ENOTDIR;
1571
1572 spin_lock(&sysctl_lock);
1573 if (de && de->data && use_table(de->set)) {
1574 /*
1575 * at that point we know that sysctl was not unregistered
1576 * and won't be until we finish
1577 */
1578 spin_unlock(&sysctl_lock);
1579 table = (struct ctl_table *) de->data;
1580 if (!table || !table->proc_handler)
1581 goto out;
1582 error = -EPERM;
1583 op = (write ? 002 : 004);
1584 if (ctl_perm(table, op))
1585 goto out;
1586
1587 /* careful: calling conventions are nasty here */
1588 res = count;
1589 error = (*table->proc_handler)(table, write, file,
1590 buf, &res, ppos);
1591 if (!error)
1592 error = res;
1593 out:
1594 spin_lock(&sysctl_lock);
1595 unuse_table(de->set);
1596 }
1597 spin_unlock(&sysctl_lock);
1598 return error;
1599 }
1600
1601 static int proc_opensys(struct inode *inode, struct file *file)
1602 {
1603 if (file->f_mode & FMODE_WRITE) {
1604 /*
1605 * sysctl entries that are not writable,
1606 * are _NOT_ writable, capabilities or not.
1607 */
1608 if (!(inode->i_mode & S_IWUSR))
1609 return -EPERM;
1610 }
1611
1612 return 0;
1613 }
1614
1615 static ssize_t proc_readsys(struct file * file, char __user * buf,
1616 size_t count, loff_t *ppos)
1617 {
1618 return do_rw_proc(0, file, buf, count, ppos);
1619 }
1620
1621 static ssize_t proc_writesys(struct file * file, const char __user * buf,
1622 size_t count, loff_t *ppos)
1623 {
1624 return do_rw_proc(1, file, (char __user *) buf, count, ppos);
1625 }
1626
1627 int _proc_do_string(void* data, int maxlen, int write, struct file *filp,
1628 void __user *buffer, size_t *lenp, loff_t *ppos)
1629 {
1630 size_t len;
1631 char __user *p;
1632 char c;
1633
1634 if (!data || !maxlen || !*lenp ||
1635 (*ppos && !write)) {
1636 *lenp = 0;
1637 return 0;
1638 }
1639
1640 if (write) {
1641 len = 0;
1642 p = buffer;
1643 while (len < *lenp) {
1644 if (get_user(c, p++))
1645 return -EFAULT;
1646 if (c == 0 || c == '\n')
1647 break;
1648 len++;
1649 }
1650 if (len >= maxlen)
1651 len = maxlen-1;
1652 if(copy_from_user(data, buffer, len))
1653 return -EFAULT;
1654 ((char *) data)[len] = 0;
1655 *ppos += *lenp;
1656 } else {
1657 len = strlen(data);
1658 if (len > maxlen)
1659 len = maxlen;
1660 if (len > *lenp)
1661 len = *lenp;
1662 if (len)
1663 if(copy_to_user(buffer, data, len))
1664 return -EFAULT;
1665 if (len < *lenp) {
1666 if(put_user('\n', ((char __user *) buffer) + len))
1667 return -EFAULT;
1668 len++;
1669 }
1670 *lenp = len;
1671 *ppos += len;
1672 }
1673 return 0;
1674 }
1675
1676 /**
1677 * proc_dostring - read a string sysctl
1678 * @table: the sysctl table
1679 * @write: %TRUE if this is a write to the sysctl file
1680 * @filp: the file structure
1681 * @buffer: the user buffer
1682 * @lenp: the size of the user buffer
1683 * @ppos: file position
1684 *
1685 * Reads/writes a string from/to the user buffer. If the kernel
1686 * buffer provided is not large enough to hold the string, the
1687 * string is truncated. The copied string is %NULL-terminated.
1688 * If the string is being read by the user process, it is copied
1689 * and a newline '\n' is added. It is truncated if the buffer is
1690 * not large enough.
1691 *
1692 * Returns 0 on success.
1693 */
1694 int proc_dostring(ctl_table *table, int write, struct file *filp,
1695 void __user *buffer, size_t *lenp, loff_t *ppos)
1696 {
1697 return _proc_do_string(table->data, table->maxlen, write, filp,
1698 buffer, lenp, ppos);
1699 }
1700
1701 /*
1702 * Special case of dostring for the UTS structure. This has locks
1703 * to observe. Should this be in kernel/sys.c ????
1704 */
1705
1706 static int proc_doutsstring(ctl_table *table, int write, struct file *filp,
1707 void __user *buffer, size_t *lenp, loff_t *ppos)
1708 {
1709 int r;
1710
1711 if (!write) {
1712 down_read(&uts_sem);
1713 r=proc_dostring(table,0,filp,buffer,lenp, ppos);
1714 up_read(&uts_sem);
1715 } else {
1716 down_write(&uts_sem);
1717 r=proc_dostring(table,1,filp,buffer,lenp, ppos);
1718 up_write(&uts_sem);
1719 }
1720 return r;
1721 }
1722
1723 static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp,
1724 int *valp,
1725 int write, void *data)
1726 {
1727 if (write) {
1728 *valp = *negp ? -*lvalp : *lvalp;
1729 } else {
1730 int val = *valp;
1731 if (val < 0) {
1732 *negp = -1;
1733 *lvalp = (unsigned long)-val;
1734 } else {
1735 *negp = 0;
1736 *lvalp = (unsigned long)val;
1737 }
1738 }
1739 return 0;
1740 }
1741
1742 static int do_proc_dointvec(ctl_table *table, int write, struct file *filp,
1743 void __user *buffer, size_t *lenp, loff_t *ppos,
1744 int (*conv)(int *negp, unsigned long *lvalp, int *valp,
1745 int write, void *data),
1746 void *data)
1747 {
1748 #define TMPBUFLEN 21
1749 int *i, vleft, first=1, neg, val;
1750 unsigned long lval;
1751 size_t left, len;
1752
1753 char buf[TMPBUFLEN], *p;
1754 char __user *s = buffer;
1755
1756 if (!table->data || !table->maxlen || !*lenp ||
1757 (*ppos && !write)) {
1758 *lenp = 0;
1759 return 0;
1760 }
1761
1762 i = (int *) table->data;
1763 vleft = table->maxlen / sizeof(*i);
1764 left = *lenp;
1765
1766 if (!conv)
1767 conv = do_proc_dointvec_conv;
1768
1769 for (; left && vleft--; i++, first=0) {
1770 if (write) {
1771 while (left) {
1772 char c;
1773 if (get_user(c, s))
1774 return -EFAULT;
1775 if (!isspace(c))
1776 break;
1777 left--;
1778 s++;
1779 }
1780 if (!left)
1781 break;
1782 neg = 0;
1783 len = left;
1784 if (len > sizeof(buf) - 1)
1785 len = sizeof(buf) - 1;
1786 if (copy_from_user(buf, s, len))
1787 return -EFAULT;
1788 buf[len] = 0;
1789 p = buf;
1790 if (*p == '-' && left > 1) {
1791 neg = 1;
1792 left--, p++;
1793 }
1794 if (*p < '0' || *p > '9')
1795 break;
1796
1797 lval = simple_strtoul(p, &p, 0);
1798
1799 len = p-buf;
1800 if ((len < left) && *p && !isspace(*p))
1801 break;
1802 if (neg)
1803 val = -val;
1804 s += len;
1805 left -= len;
1806
1807 if (conv(&neg, &lval, i, 1, data))
1808 break;
1809 } else {
1810 p = buf;
1811 if (!first)
1812 *p++ = '\t';
1813
1814 if (conv(&neg, &lval, i, 0, data))
1815 break;
1816
1817 sprintf(p, "%s%lu", neg ? "-" : "", lval);
1818 len = strlen(buf);
1819 if (len > left)
1820 len = left;
1821 if(copy_to_user(s, buf, len))
1822 return -EFAULT;
1823 left -= len;
1824 s += len;
1825 }
1826 }
1827
1828 if (!write && !first && left) {
1829 if(put_user('\n', s))
1830 return -EFAULT;
1831 left--, s++;
1832 }
1833 if (write) {
1834 while (left) {
1835 char c;
1836 if (get_user(c, s++))
1837 return -EFAULT;
1838 if (!isspace(c))
1839 break;
1840 left--;
1841 }
1842 }
1843 if (write && first)
1844 return -EINVAL;
1845 *lenp -= left;
1846 *ppos += *lenp;
1847 return 0;
1848 #undef TMPBUFLEN
1849 }
1850
1851 /**
1852 * proc_dointvec - read a vector of integers
1853 * @table: the sysctl table
1854 * @write: %TRUE if this is a write to the sysctl file
1855 * @filp: the file structure
1856 * @buffer: the user buffer
1857 * @lenp: the size of the user buffer
1858 * @ppos: file position
1859 *
1860 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1861 * values from/to the user buffer, treated as an ASCII string.
1862 *
1863 * Returns 0 on success.
1864 */
1865 int proc_dointvec(ctl_table *table, int write, struct file *filp,
1866 void __user *buffer, size_t *lenp, loff_t *ppos)
1867 {
1868 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
1869 NULL,NULL);
1870 }
1871
1872 #define OP_SET 0
1873 #define OP_AND 1
1874 #define OP_OR 2
1875 #define OP_MAX 3
1876 #define OP_MIN 4
1877
1878 static int do_proc_dointvec_bset_conv(int *negp, unsigned long *lvalp,
1879 int *valp,
1880 int write, void *data)
1881 {
1882 int op = *(int *)data;
1883 if (write) {
1884 int val = *negp ? -*lvalp : *lvalp;
1885 switch(op) {
1886 case OP_SET: *valp = val; break;
1887 case OP_AND: *valp &= val; break;
1888 case OP_OR: *valp |= val; break;
1889 case OP_MAX: if(*valp < val)
1890 *valp = val;
1891 break;
1892 case OP_MIN: if(*valp > val)
1893 *valp = val;
1894 break;
1895 }
1896 } else {
1897 int val = *valp;
1898 if (val < 0) {
1899 *negp = -1;
1900 *lvalp = (unsigned long)-val;
1901 } else {
1902 *negp = 0;
1903 *lvalp = (unsigned long)val;
1904 }
1905 }
1906 return 0;
1907 }
1908
1909 /*
1910 * init may raise the set.
1911 */
1912
1913 int proc_dointvec_bset(ctl_table *table, int write, struct file *filp,
1914 void __user *buffer, size_t *lenp, loff_t *ppos)
1915 {
1916 int op;
1917
1918 if (!capable(CAP_SYS_MODULE)) {
1919 return -EPERM;
1920 }
1921
1922 op = is_init(current) ? OP_SET : OP_AND;
1923 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
1924 do_proc_dointvec_bset_conv,&op);
1925 }
1926
1927 struct do_proc_dointvec_minmax_conv_param {
1928 int *min;
1929 int *max;
1930 };
1931
1932 static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp,
1933 int *valp,
1934 int write, void *data)
1935 {
1936 struct do_proc_dointvec_minmax_conv_param *param = data;
1937 if (write) {
1938 int val = *negp ? -*lvalp : *lvalp;
1939 if ((param->min && *param->min > val) ||
1940 (param->max && *param->max < val))
1941 return -EINVAL;
1942 *valp = val;
1943 } else {
1944 int val = *valp;
1945 if (val < 0) {
1946 *negp = -1;
1947 *lvalp = (unsigned long)-val;
1948 } else {
1949 *negp = 0;
1950 *lvalp = (unsigned long)val;
1951 }
1952 }
1953 return 0;
1954 }
1955
1956 /**
1957 * proc_dointvec_minmax - read a vector of integers with min/max values
1958 * @table: the sysctl table
1959 * @write: %TRUE if this is a write to the sysctl file
1960 * @filp: the file structure
1961 * @buffer: the user buffer
1962 * @lenp: the size of the user buffer
1963 * @ppos: file position
1964 *
1965 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1966 * values from/to the user buffer, treated as an ASCII string.
1967 *
1968 * This routine will ensure the values are within the range specified by
1969 * table->extra1 (min) and table->extra2 (max).
1970 *
1971 * Returns 0 on success.
1972 */
1973 int proc_dointvec_minmax(ctl_table *table, int write, struct file *filp,
1974 void __user *buffer, size_t *lenp, loff_t *ppos)
1975 {
1976 struct do_proc_dointvec_minmax_conv_param param = {
1977 .min = (int *) table->extra1,
1978 .max = (int *) table->extra2,
1979 };
1980 return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
1981 do_proc_dointvec_minmax_conv, &param);
1982 }
1983
1984 static int do_proc_doulongvec_minmax(ctl_table *table, int write,
1985 struct file *filp,
1986 void __user *buffer,
1987 size_t *lenp, loff_t *ppos,
1988 unsigned long convmul,
1989 unsigned long convdiv)
1990 {
1991 #define TMPBUFLEN 21
1992 unsigned long *i, *min, *max, val;
1993 int vleft, first=1, neg;
1994 size_t len, left;
1995 char buf[TMPBUFLEN], *p;
1996 char __user *s = buffer;
1997
1998 if (!table->data || !table->maxlen || !*lenp ||
1999 (*ppos && !write)) {
2000 *lenp = 0;
2001 return 0;
2002 }
2003
2004 i = (unsigned long *) table->data;
2005 min = (unsigned long *) table->extra1;
2006 max = (unsigned long *) table->extra2;
2007 vleft = table->maxlen / sizeof(unsigned long);
2008 left = *lenp;
2009
2010 for (; left && vleft--; i++, min++, max++, first=0) {
2011 if (write) {
2012 while (left) {
2013 char c;
2014 if (get_user(c, s))
2015 return -EFAULT;
2016 if (!isspace(c))
2017 break;
2018 left--;
2019 s++;
2020 }
2021 if (!left)
2022 break;
2023 neg = 0;
2024 len = left;
2025 if (len > TMPBUFLEN-1)
2026 len = TMPBUFLEN-1;
2027 if (copy_from_user(buf, s, len))
2028 return -EFAULT;
2029 buf[len] = 0;
2030 p = buf;
2031 if (*p == '-' && left > 1) {
2032 neg = 1;
2033 left--, p++;
2034 }
2035 if (*p < '0' || *p > '9')
2036 break;
2037 val = simple_strtoul(p, &p, 0) * convmul / convdiv ;
2038 len = p-buf;
2039 if ((len < left) && *p && !isspace(*p))
2040 break;
2041 if (neg)
2042 val = -val;
2043 s += len;
2044 left -= len;
2045
2046 if(neg)
2047 continue;
2048 if ((min && val < *min) || (max && val > *max))
2049 continue;
2050 *i = val;
2051 } else {
2052 p = buf;
2053 if (!first)
2054 *p++ = '\t';
2055 sprintf(p, "%lu", convdiv * (*i) / convmul);
2056 len = strlen(buf);
2057 if (len > left)
2058 len = left;
2059 if(copy_to_user(s, buf, len))
2060 return -EFAULT;
2061 left -= len;
2062 s += len;
2063 }
2064 }
2065
2066 if (!write && !first && left) {
2067 if(put_user('\n', s))
2068 return -EFAULT;
2069 left--, s++;
2070 }
2071 if (write) {
2072 while (left) {
2073 char c;
2074 if (get_user(c, s++))
2075 return -EFAULT;
2076 if (!isspace(c))
2077 break;
2078 left--;
2079 }
2080 }
2081 if (write && first)
2082 return -EINVAL;
2083 *lenp -= left;
2084 *ppos += *lenp;
2085 return 0;
2086 #undef TMPBUFLEN
2087 }
2088
2089 /**
2090 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2091 * @table: the sysctl table
2092 * @write: %TRUE if this is a write to the sysctl file
2093 * @filp: the file structure
2094 * @buffer: the user buffer
2095 * @lenp: the size of the user buffer
2096 * @ppos: file position
2097 *
2098 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2099 * values from/to the user buffer, treated as an ASCII string.
2100 *
2101 * This routine will ensure the values are within the range specified by
2102 * table->extra1 (min) and table->extra2 (max).
2103 *
2104 * Returns 0 on success.
2105 */
2106 int proc_doulongvec_minmax(ctl_table *table, int write, struct file *filp,
2107 void __user *buffer, size_t *lenp, loff_t *ppos)
2108 {
2109 return do_proc_doulongvec_minmax(table, write, filp, buffer, lenp, ppos, 1l, 1l);
2110 }
2111
2112 /**
2113 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2114 * @table: the sysctl table
2115 * @write: %TRUE if this is a write to the sysctl file
2116 * @filp: the file structure
2117 * @buffer: the user buffer
2118 * @lenp: the size of the user buffer
2119 * @ppos: file position
2120 *
2121 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2122 * values from/to the user buffer, treated as an ASCII string. The values
2123 * are treated as milliseconds, and converted to jiffies when they are stored.
2124 *
2125 * This routine will ensure the values are within the range specified by
2126 * table->extra1 (min) and table->extra2 (max).
2127 *
2128 * Returns 0 on success.
2129 */
2130 int proc_doulongvec_ms_jiffies_minmax(ctl_table *table, int write,
2131 struct file *filp,
2132 void __user *buffer,
2133 size_t *lenp, loff_t *ppos)
2134 {
2135 return do_proc_doulongvec_minmax(table, write, filp, buffer,
2136 lenp, ppos, HZ, 1000l);
2137 }
2138
2139
2140 static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp,
2141 int *valp,
2142 int write, void *data)
2143 {
2144 if (write) {
2145 if (*lvalp > LONG_MAX / HZ)
2146 return 1;
2147 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2148 } else {
2149 int val = *valp;
2150 unsigned long lval;
2151 if (val < 0) {
2152 *negp = -1;
2153 lval = (unsigned long)-val;
2154 } else {
2155 *negp = 0;
2156 lval = (unsigned long)val;
2157 }
2158 *lvalp = lval / HZ;
2159 }
2160 return 0;
2161 }
2162
2163 static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp,
2164 int *valp,
2165 int write, void *data)
2166 {
2167 if (write) {
2168 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2169 return 1;
2170 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2171 } else {
2172 int val = *valp;
2173 unsigned long lval;
2174 if (val < 0) {
2175 *negp = -1;
2176 lval = (unsigned long)-val;
2177 } else {
2178 *negp = 0;
2179 lval = (unsigned long)val;
2180 }
2181 *lvalp = jiffies_to_clock_t(lval);
2182 }
2183 return 0;
2184 }
2185
2186 static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp,
2187 int *valp,
2188 int write, void *data)
2189 {
2190 if (write) {
2191 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2192 } else {
2193 int val = *valp;
2194 unsigned long lval;
2195 if (val < 0) {
2196 *negp = -1;
2197 lval = (unsigned long)-val;
2198 } else {
2199 *negp = 0;
2200 lval = (unsigned long)val;
2201 }
2202 *lvalp = jiffies_to_msecs(lval);
2203 }
2204 return 0;
2205 }
2206
2207 /**
2208 * proc_dointvec_jiffies - read a vector of integers as seconds
2209 * @table: the sysctl table
2210 * @write: %TRUE if this is a write to the sysctl file
2211 * @filp: the file structure
2212 * @buffer: the user buffer
2213 * @lenp: the size of the user buffer
2214 * @ppos: file position
2215 *
2216 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2217 * values from/to the user buffer, treated as an ASCII string.
2218 * The values read are assumed to be in seconds, and are converted into
2219 * jiffies.
2220 *
2221 * Returns 0 on success.
2222 */
2223 int proc_dointvec_jiffies(ctl_table *table, int write, struct file *filp,
2224 void __user *buffer, size_t *lenp, loff_t *ppos)
2225 {
2226 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2227 do_proc_dointvec_jiffies_conv,NULL);
2228 }
2229
2230 /**
2231 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2232 * @table: the sysctl table
2233 * @write: %TRUE if this is a write to the sysctl file
2234 * @filp: the file structure
2235 * @buffer: the user buffer
2236 * @lenp: the size of the user buffer
2237 * @ppos: pointer to the file position
2238 *
2239 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2240 * values from/to the user buffer, treated as an ASCII string.
2241 * The values read are assumed to be in 1/USER_HZ seconds, and
2242 * are converted into jiffies.
2243 *
2244 * Returns 0 on success.
2245 */
2246 int proc_dointvec_userhz_jiffies(ctl_table *table, int write, struct file *filp,
2247 void __user *buffer, size_t *lenp, loff_t *ppos)
2248 {
2249 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2250 do_proc_dointvec_userhz_jiffies_conv,NULL);
2251 }
2252
2253 /**
2254 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2255 * @table: the sysctl table
2256 * @write: %TRUE if this is a write to the sysctl file
2257 * @filp: the file structure
2258 * @buffer: the user buffer
2259 * @lenp: the size of the user buffer
2260 * @ppos: file position
2261 * @ppos: the current position in the file
2262 *
2263 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2264 * values from/to the user buffer, treated as an ASCII string.
2265 * The values read are assumed to be in 1/1000 seconds, and
2266 * are converted into jiffies.
2267 *
2268 * Returns 0 on success.
2269 */
2270 int proc_dointvec_ms_jiffies(ctl_table *table, int write, struct file *filp,
2271 void __user *buffer, size_t *lenp, loff_t *ppos)
2272 {
2273 return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2274 do_proc_dointvec_ms_jiffies_conv, NULL);
2275 }
2276
2277 #else /* CONFIG_PROC_FS */
2278
2279 int proc_dostring(ctl_table *table, int write, struct file *filp,
2280 void __user *buffer, size_t *lenp, loff_t *ppos)
2281 {
2282 return -ENOSYS;
2283 }
2284
2285 static int proc_doutsstring(ctl_table *table, int write, struct file *filp,
2286 void __user *buffer, size_t *lenp, loff_t *ppos)
2287 {
2288 return -ENOSYS;
2289 }
2290
2291 int proc_dointvec(ctl_table *table, int write, struct file *filp,
2292 void __user *buffer, size_t *lenp, loff_t *ppos)
2293 {
2294 return -ENOSYS;
2295 }
2296
2297 int proc_dointvec_bset(ctl_table *table, int write, struct file *filp,
2298 void __user *buffer, size_t *lenp, loff_t *ppos)
2299 {
2300 return -ENOSYS;
2301 }
2302
2303 int proc_dointvec_minmax(ctl_table *table, int write, struct file *filp,
2304 void __user *buffer, size_t *lenp, loff_t *ppos)
2305 {
2306 return -ENOSYS;
2307 }
2308
2309 int proc_dointvec_jiffies(ctl_table *table, int write, struct file *filp,
2310 void __user *buffer, size_t *lenp, loff_t *ppos)
2311 {
2312 return -ENOSYS;
2313 }
2314
2315 int proc_dointvec_userhz_jiffies(ctl_table *table, int write, struct file *filp,
2316 void __user *buffer, size_t *lenp, loff_t *ppos)
2317 {
2318 return -ENOSYS;
2319 }
2320
2321 int proc_dointvec_ms_jiffies(ctl_table *table, int write, struct file *filp,
2322 void __user *buffer, size_t *lenp, loff_t *ppos)
2323 {
2324 return -ENOSYS;
2325 }
2326
2327 int proc_doulongvec_minmax(ctl_table *table, int write, struct file *filp,
2328 void __user *buffer, size_t *lenp, loff_t *ppos)
2329 {
2330 return -ENOSYS;
2331 }
2332
2333 int proc_doulongvec_ms_jiffies_minmax(ctl_table *table, int write,
2334 struct file *filp,
2335 void __user *buffer,
2336 size_t *lenp, loff_t *ppos)
2337 {
2338 return -ENOSYS;
2339 }
2340
2341
2342 #endif /* CONFIG_PROC_FS */
2343
2344
2345 #ifdef CONFIG_SYSCTL_SYSCALL
2346 /*
2347 * General sysctl support routines
2348 */
2349
2350 /* The generic string strategy routine: */
2351 int sysctl_string(ctl_table *table, int __user *name, int nlen,
2352 void __user *oldval, size_t __user *oldlenp,
2353 void __user *newval, size_t newlen, void **context)
2354 {
2355 if (!table->data || !table->maxlen)
2356 return -ENOTDIR;
2357
2358 if (oldval && oldlenp) {
2359 size_t bufsize;
2360 if (get_user(bufsize, oldlenp))
2361 return -EFAULT;
2362 if (bufsize) {
2363 size_t len = strlen(table->data), copied;
2364
2365 /* This shouldn't trigger for a well-formed sysctl */
2366 if (len > table->maxlen)
2367 len = table->maxlen;
2368
2369 /* Copy up to a max of bufsize-1 bytes of the string */
2370 copied = (len >= bufsize) ? bufsize - 1 : len;
2371
2372 if (copy_to_user(oldval, table->data, copied) ||
2373 put_user(0, (char __user *)(oldval + copied)))
2374 return -EFAULT;
2375 if (put_user(len, oldlenp))
2376 return -EFAULT;
2377 }
2378 }
2379 if (newval && newlen) {
2380 size_t len = newlen;
2381 if (len > table->maxlen)
2382 len = table->maxlen;
2383 if(copy_from_user(table->data, newval, len))
2384 return -EFAULT;
2385 if (len == table->maxlen)
2386 len--;
2387 ((char *) table->data)[len] = 0;
2388 }
2389 return 1;
2390 }
2391
2392 /*
2393 * This function makes sure that all of the integers in the vector
2394 * are between the minimum and maximum values given in the arrays
2395 * table->extra1 and table->extra2, respectively.
2396 */
2397 int sysctl_intvec(ctl_table *table, int __user *name, int nlen,
2398 void __user *oldval, size_t __user *oldlenp,
2399 void __user *newval, size_t newlen, void **context)
2400 {
2401
2402 if (newval && newlen) {
2403 int __user *vec = (int __user *) newval;
2404 int *min = (int *) table->extra1;
2405 int *max = (int *) table->extra2;
2406 size_t length;
2407 int i;
2408
2409 if (newlen % sizeof(int) != 0)
2410 return -EINVAL;
2411
2412 if (!table->extra1 && !table->extra2)
2413 return 0;
2414
2415 if (newlen > table->maxlen)
2416 newlen = table->maxlen;
2417 length = newlen / sizeof(int);
2418
2419 for (i = 0; i < length; i++) {
2420 int value;
2421 if (get_user(value, vec + i))
2422 return -EFAULT;
2423 if (min && value < min[i])
2424 return -EINVAL;
2425 if (max && value > max[i])
2426 return -EINVAL;
2427 }
2428 }
2429 return 0;
2430 }
2431
2432 /* Strategy function to convert jiffies to seconds */
2433 int sysctl_jiffies(ctl_table *table, int __user *name, int nlen,
2434 void __user *oldval, size_t __user *oldlenp,
2435 void __user *newval, size_t newlen, void **context)
2436 {
2437 if (oldval) {
2438 size_t olen;
2439 if (oldlenp) {
2440 if (get_user(olen, oldlenp))
2441 return -EFAULT;
2442 if (olen!=sizeof(int))
2443 return -EINVAL;
2444 }
2445 if (put_user(*(int *)(table->data)/HZ, (int __user *)oldval) ||
2446 (oldlenp && put_user(sizeof(int),oldlenp)))
2447 return -EFAULT;
2448 }
2449 if (newval && newlen) {
2450 int new;
2451 if (newlen != sizeof(int))
2452 return -EINVAL;
2453 if (get_user(new, (int __user *)newval))
2454 return -EFAULT;
2455 *(int *)(table->data) = new*HZ;
2456 }
2457 return 1;
2458 }
2459
2460 /* Strategy function to convert jiffies to seconds */
2461 int sysctl_ms_jiffies(ctl_table *table, int __user *name, int nlen,
2462 void __user *oldval, size_t __user *oldlenp,
2463 void __user *newval, size_t newlen, void **context)
2464 {
2465 if (oldval) {
2466 size_t olen;
2467 if (oldlenp) {
2468 if (get_user(olen, oldlenp))
2469 return -EFAULT;
2470 if (olen!=sizeof(int))
2471 return -EINVAL;
2472 }
2473 if (put_user(jiffies_to_msecs(*(int *)(table->data)), (int __user *)oldval) ||
2474 (oldlenp && put_user(sizeof(int),oldlenp)))
2475 return -EFAULT;
2476 }
2477 if (newval && newlen) {
2478 int new;
2479 if (newlen != sizeof(int))
2480 return -EINVAL;
2481 if (get_user(new, (int __user *)newval))
2482 return -EFAULT;
2483 *(int *)(table->data) = msecs_to_jiffies(new);
2484 }
2485 return 1;
2486 }
2487
2488 #else /* CONFIG_SYSCTL_SYSCALL */
2489
2490
2491 asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
2492 {
2493 static int msg_count;
2494
2495 if (msg_count < 5) {
2496 msg_count++;
2497 printk(KERN_INFO
2498 "warning: process `%s' used the removed sysctl "
2499 "system call\n", current->comm);
2500 }
2501 return -ENOSYS;
2502 }
2503
2504 int sysctl_string(ctl_table *table, int __user *name, int nlen,
2505 void __user *oldval, size_t __user *oldlenp,
2506 void __user *newval, size_t newlen, void **context)
2507 {
2508 return -ENOSYS;
2509 }
2510
2511 int sysctl_intvec(ctl_table *table, int __user *name, int nlen,
2512 void __user *oldval, size_t __user *oldlenp,
2513 void __user *newval, size_t newlen, void **context)
2514 {
2515 return -ENOSYS;
2516 }
2517
2518 int sysctl_jiffies(ctl_table *table, int __user *name, int nlen,
2519 void __user *oldval, size_t __user *oldlenp,
2520 void __user *newval, size_t newlen, void **context)
2521 {
2522 return -ENOSYS;
2523 }
2524
2525 int sysctl_ms_jiffies(ctl_table *table, int __user *name, int nlen,
2526 void __user *oldval, size_t __user *oldlenp,
2527 void __user *newval, size_t newlen, void **context)
2528 {
2529 return -ENOSYS;
2530 }
2531
2532 #endif /* CONFIG_SYSCTL_SYSCALL */
2533
2534 /*
2535 * No sense putting this after each symbol definition, twice,
2536 * exception granted :-)
2537 */
2538 EXPORT_SYMBOL(proc_dointvec);
2539 EXPORT_SYMBOL(proc_dointvec_jiffies);
2540 EXPORT_SYMBOL(proc_dointvec_minmax);
2541 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2542 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2543 EXPORT_SYMBOL(proc_dostring);
2544 EXPORT_SYMBOL(proc_doulongvec_minmax);
2545 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
2546 EXPORT_SYMBOL(register_sysctl_table);
2547 EXPORT_SYMBOL(sysctl_intvec);
2548 EXPORT_SYMBOL(sysctl_jiffies);
2549 EXPORT_SYMBOL(sysctl_ms_jiffies);
2550 EXPORT_SYMBOL(sysctl_string);
2551 EXPORT_SYMBOL(unregister_sysctl_table);
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree