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Merge head 'for-linus' of master.kernel.org:/pub/scm/linux/kernel/git/roland/infiniband
[mirror_ubuntu-jammy-kernel.git] / kernel / sysctl.c
1 /*
2 * sysctl.c: General linux system control interface
3 *
4 * Begun 24 March 1995, Stephen Tweedie
5 * Added /proc support, Dec 1995
6 * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas.
7 * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver.
8 * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver.
9 * Dynamic registration fixes, Stephen Tweedie.
10 * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn.
11 * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris
12 * Horn.
13 * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer.
14 * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer.
15 * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill
16 * Wendling.
17 * The list_for_each() macro wasn't appropriate for the sysctl loop.
18 * Removed it and replaced it with older style, 03/23/00, Bill Wendling
19 */
20
21 #include <linux/config.h>
22 #include <linux/module.h>
23 #include <linux/mm.h>
24 #include <linux/swap.h>
25 #include <linux/slab.h>
26 #include <linux/sysctl.h>
27 #include <linux/proc_fs.h>
28 #include <linux/ctype.h>
29 #include <linux/utsname.h>
30 #include <linux/capability.h>
31 #include <linux/smp_lock.h>
32 #include <linux/init.h>
33 #include <linux/kernel.h>
34 #include <linux/sysrq.h>
35 #include <linux/highuid.h>
36 #include <linux/writeback.h>
37 #include <linux/hugetlb.h>
38 #include <linux/security.h>
39 #include <linux/initrd.h>
40 #include <linux/times.h>
41 #include <linux/limits.h>
42 #include <linux/dcache.h>
43 #include <linux/syscalls.h>
44
45 #include <asm/uaccess.h>
46 #include <asm/processor.h>
47
48 #ifdef CONFIG_ROOT_NFS
49 #include <linux/nfs_fs.h>
50 #endif
51
52 #if defined(CONFIG_SYSCTL)
53
54 /* External variables not in a header file. */
55 extern int C_A_D;
56 extern int sysctl_overcommit_memory;
57 extern int sysctl_overcommit_ratio;
58 extern int max_threads;
59 extern int sysrq_enabled;
60 extern int core_uses_pid;
61 extern int suid_dumpable;
62 extern char core_pattern[];
63 extern int cad_pid;
64 extern int pid_max;
65 extern int min_free_kbytes;
66 extern int printk_ratelimit_jiffies;
67 extern int printk_ratelimit_burst;
68 extern int pid_max_min, pid_max_max;
69
70 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
71 int unknown_nmi_panic;
72 extern int proc_unknown_nmi_panic(ctl_table *, int, struct file *,
73 void __user *, size_t *, loff_t *);
74 #endif
75
76 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
77 static int maxolduid = 65535;
78 static int minolduid;
79
80 static int ngroups_max = NGROUPS_MAX;
81
82 #ifdef CONFIG_KMOD
83 extern char modprobe_path[];
84 #endif
85 #ifdef CONFIG_HOTPLUG
86 extern char hotplug_path[];
87 #endif
88 #ifdef CONFIG_CHR_DEV_SG
89 extern int sg_big_buff;
90 #endif
91 #ifdef CONFIG_SYSVIPC
92 extern size_t shm_ctlmax;
93 extern size_t shm_ctlall;
94 extern int shm_ctlmni;
95 extern int msg_ctlmax;
96 extern int msg_ctlmnb;
97 extern int msg_ctlmni;
98 extern int sem_ctls[];
99 #endif
100
101 #ifdef __sparc__
102 extern char reboot_command [];
103 extern int stop_a_enabled;
104 extern int scons_pwroff;
105 #endif
106
107 #ifdef __hppa__
108 extern int pwrsw_enabled;
109 extern int unaligned_enabled;
110 #endif
111
112 #ifdef CONFIG_ARCH_S390
113 #ifdef CONFIG_MATHEMU
114 extern int sysctl_ieee_emulation_warnings;
115 #endif
116 extern int sysctl_userprocess_debug;
117 extern int spin_retry;
118 #endif
119
120 extern int sysctl_hz_timer;
121
122 #ifdef CONFIG_BSD_PROCESS_ACCT
123 extern int acct_parm[];
124 #endif
125
126 int randomize_va_space = 1;
127
128 static int parse_table(int __user *, int, void __user *, size_t __user *, void __user *, size_t,
129 ctl_table *, void **);
130 static int proc_doutsstring(ctl_table *table, int write, struct file *filp,
131 void __user *buffer, size_t *lenp, loff_t *ppos);
132
133 static ctl_table root_table[];
134 static struct ctl_table_header root_table_header =
135 { root_table, LIST_HEAD_INIT(root_table_header.ctl_entry) };
136
137 static ctl_table kern_table[];
138 static ctl_table vm_table[];
139 #ifdef CONFIG_NET
140 extern ctl_table net_table[];
141 #endif
142 static ctl_table proc_table[];
143 static ctl_table fs_table[];
144 static ctl_table debug_table[];
145 static ctl_table dev_table[];
146 extern ctl_table random_table[];
147 #ifdef CONFIG_UNIX98_PTYS
148 extern ctl_table pty_table[];
149 #endif
150 #ifdef CONFIG_INOTIFY
151 extern ctl_table inotify_table[];
152 #endif
153
154 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
155 int sysctl_legacy_va_layout;
156 #endif
157
158 /* /proc declarations: */
159
160 #ifdef CONFIG_PROC_FS
161
162 static ssize_t proc_readsys(struct file *, char __user *, size_t, loff_t *);
163 static ssize_t proc_writesys(struct file *, const char __user *, size_t, loff_t *);
164 static int proc_opensys(struct inode *, struct file *);
165
166 struct file_operations proc_sys_file_operations = {
167 .open = proc_opensys,
168 .read = proc_readsys,
169 .write = proc_writesys,
170 };
171
172 extern struct proc_dir_entry *proc_sys_root;
173
174 static void register_proc_table(ctl_table *, struct proc_dir_entry *);
175 static void unregister_proc_table(ctl_table *, struct proc_dir_entry *);
176 #endif
177
178 /* The default sysctl tables: */
179
180 static ctl_table root_table[] = {
181 {
182 .ctl_name = CTL_KERN,
183 .procname = "kernel",
184 .mode = 0555,
185 .child = kern_table,
186 },
187 {
188 .ctl_name = CTL_VM,
189 .procname = "vm",
190 .mode = 0555,
191 .child = vm_table,
192 },
193 #ifdef CONFIG_NET
194 {
195 .ctl_name = CTL_NET,
196 .procname = "net",
197 .mode = 0555,
198 .child = net_table,
199 },
200 #endif
201 {
202 .ctl_name = CTL_PROC,
203 .procname = "proc",
204 .mode = 0555,
205 .child = proc_table,
206 },
207 {
208 .ctl_name = CTL_FS,
209 .procname = "fs",
210 .mode = 0555,
211 .child = fs_table,
212 },
213 {
214 .ctl_name = CTL_DEBUG,
215 .procname = "debug",
216 .mode = 0555,
217 .child = debug_table,
218 },
219 {
220 .ctl_name = CTL_DEV,
221 .procname = "dev",
222 .mode = 0555,
223 .child = dev_table,
224 },
225
226 { .ctl_name = 0 }
227 };
228
229 static ctl_table kern_table[] = {
230 {
231 .ctl_name = KERN_OSTYPE,
232 .procname = "ostype",
233 .data = system_utsname.sysname,
234 .maxlen = sizeof(system_utsname.sysname),
235 .mode = 0444,
236 .proc_handler = &proc_doutsstring,
237 .strategy = &sysctl_string,
238 },
239 {
240 .ctl_name = KERN_OSRELEASE,
241 .procname = "osrelease",
242 .data = system_utsname.release,
243 .maxlen = sizeof(system_utsname.release),
244 .mode = 0444,
245 .proc_handler = &proc_doutsstring,
246 .strategy = &sysctl_string,
247 },
248 {
249 .ctl_name = KERN_VERSION,
250 .procname = "version",
251 .data = system_utsname.version,
252 .maxlen = sizeof(system_utsname.version),
253 .mode = 0444,
254 .proc_handler = &proc_doutsstring,
255 .strategy = &sysctl_string,
256 },
257 {
258 .ctl_name = KERN_NODENAME,
259 .procname = "hostname",
260 .data = system_utsname.nodename,
261 .maxlen = sizeof(system_utsname.nodename),
262 .mode = 0644,
263 .proc_handler = &proc_doutsstring,
264 .strategy = &sysctl_string,
265 },
266 {
267 .ctl_name = KERN_DOMAINNAME,
268 .procname = "domainname",
269 .data = system_utsname.domainname,
270 .maxlen = sizeof(system_utsname.domainname),
271 .mode = 0644,
272 .proc_handler = &proc_doutsstring,
273 .strategy = &sysctl_string,
274 },
275 {
276 .ctl_name = KERN_PANIC,
277 .procname = "panic",
278 .data = &panic_timeout,
279 .maxlen = sizeof(int),
280 .mode = 0644,
281 .proc_handler = &proc_dointvec,
282 },
283 {
284 .ctl_name = KERN_CORE_USES_PID,
285 .procname = "core_uses_pid",
286 .data = &core_uses_pid,
287 .maxlen = sizeof(int),
288 .mode = 0644,
289 .proc_handler = &proc_dointvec,
290 },
291 {
292 .ctl_name = KERN_CORE_PATTERN,
293 .procname = "core_pattern",
294 .data = core_pattern,
295 .maxlen = 64,
296 .mode = 0644,
297 .proc_handler = &proc_dostring,
298 .strategy = &sysctl_string,
299 },
300 {
301 .ctl_name = KERN_TAINTED,
302 .procname = "tainted",
303 .data = &tainted,
304 .maxlen = sizeof(int),
305 .mode = 0444,
306 .proc_handler = &proc_dointvec,
307 },
308 {
309 .ctl_name = KERN_CAP_BSET,
310 .procname = "cap-bound",
311 .data = &cap_bset,
312 .maxlen = sizeof(kernel_cap_t),
313 .mode = 0600,
314 .proc_handler = &proc_dointvec_bset,
315 },
316 #ifdef CONFIG_BLK_DEV_INITRD
317 {
318 .ctl_name = KERN_REALROOTDEV,
319 .procname = "real-root-dev",
320 .data = &real_root_dev,
321 .maxlen = sizeof(int),
322 .mode = 0644,
323 .proc_handler = &proc_dointvec,
324 },
325 #endif
326 #ifdef __sparc__
327 {
328 .ctl_name = KERN_SPARC_REBOOT,
329 .procname = "reboot-cmd",
330 .data = reboot_command,
331 .maxlen = 256,
332 .mode = 0644,
333 .proc_handler = &proc_dostring,
334 .strategy = &sysctl_string,
335 },
336 {
337 .ctl_name = KERN_SPARC_STOP_A,
338 .procname = "stop-a",
339 .data = &stop_a_enabled,
340 .maxlen = sizeof (int),
341 .mode = 0644,
342 .proc_handler = &proc_dointvec,
343 },
344 {
345 .ctl_name = KERN_SPARC_SCONS_PWROFF,
346 .procname = "scons-poweroff",
347 .data = &scons_pwroff,
348 .maxlen = sizeof (int),
349 .mode = 0644,
350 .proc_handler = &proc_dointvec,
351 },
352 #endif
353 #ifdef __hppa__
354 {
355 .ctl_name = KERN_HPPA_PWRSW,
356 .procname = "soft-power",
357 .data = &pwrsw_enabled,
358 .maxlen = sizeof (int),
359 .mode = 0644,
360 .proc_handler = &proc_dointvec,
361 },
362 {
363 .ctl_name = KERN_HPPA_UNALIGNED,
364 .procname = "unaligned-trap",
365 .data = &unaligned_enabled,
366 .maxlen = sizeof (int),
367 .mode = 0644,
368 .proc_handler = &proc_dointvec,
369 },
370 #endif
371 {
372 .ctl_name = KERN_CTLALTDEL,
373 .procname = "ctrl-alt-del",
374 .data = &C_A_D,
375 .maxlen = sizeof(int),
376 .mode = 0644,
377 .proc_handler = &proc_dointvec,
378 },
379 {
380 .ctl_name = KERN_PRINTK,
381 .procname = "printk",
382 .data = &console_loglevel,
383 .maxlen = 4*sizeof(int),
384 .mode = 0644,
385 .proc_handler = &proc_dointvec,
386 },
387 #ifdef CONFIG_KMOD
388 {
389 .ctl_name = KERN_MODPROBE,
390 .procname = "modprobe",
391 .data = &modprobe_path,
392 .maxlen = KMOD_PATH_LEN,
393 .mode = 0644,
394 .proc_handler = &proc_dostring,
395 .strategy = &sysctl_string,
396 },
397 #endif
398 #ifdef CONFIG_HOTPLUG
399 {
400 .ctl_name = KERN_HOTPLUG,
401 .procname = "hotplug",
402 .data = &hotplug_path,
403 .maxlen = HOTPLUG_PATH_LEN,
404 .mode = 0644,
405 .proc_handler = &proc_dostring,
406 .strategy = &sysctl_string,
407 },
408 #endif
409 #ifdef CONFIG_CHR_DEV_SG
410 {
411 .ctl_name = KERN_SG_BIG_BUFF,
412 .procname = "sg-big-buff",
413 .data = &sg_big_buff,
414 .maxlen = sizeof (int),
415 .mode = 0444,
416 .proc_handler = &proc_dointvec,
417 },
418 #endif
419 #ifdef CONFIG_BSD_PROCESS_ACCT
420 {
421 .ctl_name = KERN_ACCT,
422 .procname = "acct",
423 .data = &acct_parm,
424 .maxlen = 3*sizeof(int),
425 .mode = 0644,
426 .proc_handler = &proc_dointvec,
427 },
428 #endif
429 #ifdef CONFIG_SYSVIPC
430 {
431 .ctl_name = KERN_SHMMAX,
432 .procname = "shmmax",
433 .data = &shm_ctlmax,
434 .maxlen = sizeof (size_t),
435 .mode = 0644,
436 .proc_handler = &proc_doulongvec_minmax,
437 },
438 {
439 .ctl_name = KERN_SHMALL,
440 .procname = "shmall",
441 .data = &shm_ctlall,
442 .maxlen = sizeof (size_t),
443 .mode = 0644,
444 .proc_handler = &proc_doulongvec_minmax,
445 },
446 {
447 .ctl_name = KERN_SHMMNI,
448 .procname = "shmmni",
449 .data = &shm_ctlmni,
450 .maxlen = sizeof (int),
451 .mode = 0644,
452 .proc_handler = &proc_dointvec,
453 },
454 {
455 .ctl_name = KERN_MSGMAX,
456 .procname = "msgmax",
457 .data = &msg_ctlmax,
458 .maxlen = sizeof (int),
459 .mode = 0644,
460 .proc_handler = &proc_dointvec,
461 },
462 {
463 .ctl_name = KERN_MSGMNI,
464 .procname = "msgmni",
465 .data = &msg_ctlmni,
466 .maxlen = sizeof (int),
467 .mode = 0644,
468 .proc_handler = &proc_dointvec,
469 },
470 {
471 .ctl_name = KERN_MSGMNB,
472 .procname = "msgmnb",
473 .data = &msg_ctlmnb,
474 .maxlen = sizeof (int),
475 .mode = 0644,
476 .proc_handler = &proc_dointvec,
477 },
478 {
479 .ctl_name = KERN_SEM,
480 .procname = "sem",
481 .data = &sem_ctls,
482 .maxlen = 4*sizeof (int),
483 .mode = 0644,
484 .proc_handler = &proc_dointvec,
485 },
486 #endif
487 #ifdef CONFIG_MAGIC_SYSRQ
488 {
489 .ctl_name = KERN_SYSRQ,
490 .procname = "sysrq",
491 .data = &sysrq_enabled,
492 .maxlen = sizeof (int),
493 .mode = 0644,
494 .proc_handler = &proc_dointvec,
495 },
496 #endif
497 {
498 .ctl_name = KERN_CADPID,
499 .procname = "cad_pid",
500 .data = &cad_pid,
501 .maxlen = sizeof (int),
502 .mode = 0600,
503 .proc_handler = &proc_dointvec,
504 },
505 {
506 .ctl_name = KERN_MAX_THREADS,
507 .procname = "threads-max",
508 .data = &max_threads,
509 .maxlen = sizeof(int),
510 .mode = 0644,
511 .proc_handler = &proc_dointvec,
512 },
513 {
514 .ctl_name = KERN_RANDOM,
515 .procname = "random",
516 .mode = 0555,
517 .child = random_table,
518 },
519 #ifdef CONFIG_UNIX98_PTYS
520 {
521 .ctl_name = KERN_PTY,
522 .procname = "pty",
523 .mode = 0555,
524 .child = pty_table,
525 },
526 #endif
527 {
528 .ctl_name = KERN_OVERFLOWUID,
529 .procname = "overflowuid",
530 .data = &overflowuid,
531 .maxlen = sizeof(int),
532 .mode = 0644,
533 .proc_handler = &proc_dointvec_minmax,
534 .strategy = &sysctl_intvec,
535 .extra1 = &minolduid,
536 .extra2 = &maxolduid,
537 },
538 {
539 .ctl_name = KERN_OVERFLOWGID,
540 .procname = "overflowgid",
541 .data = &overflowgid,
542 .maxlen = sizeof(int),
543 .mode = 0644,
544 .proc_handler = &proc_dointvec_minmax,
545 .strategy = &sysctl_intvec,
546 .extra1 = &minolduid,
547 .extra2 = &maxolduid,
548 },
549 #ifdef CONFIG_ARCH_S390
550 #ifdef CONFIG_MATHEMU
551 {
552 .ctl_name = KERN_IEEE_EMULATION_WARNINGS,
553 .procname = "ieee_emulation_warnings",
554 .data = &sysctl_ieee_emulation_warnings,
555 .maxlen = sizeof(int),
556 .mode = 0644,
557 .proc_handler = &proc_dointvec,
558 },
559 #endif
560 #ifdef CONFIG_NO_IDLE_HZ
561 {
562 .ctl_name = KERN_HZ_TIMER,
563 .procname = "hz_timer",
564 .data = &sysctl_hz_timer,
565 .maxlen = sizeof(int),
566 .mode = 0644,
567 .proc_handler = &proc_dointvec,
568 },
569 #endif
570 {
571 .ctl_name = KERN_S390_USER_DEBUG_LOGGING,
572 .procname = "userprocess_debug",
573 .data = &sysctl_userprocess_debug,
574 .maxlen = sizeof(int),
575 .mode = 0644,
576 .proc_handler = &proc_dointvec,
577 },
578 #endif
579 {
580 .ctl_name = KERN_PIDMAX,
581 .procname = "pid_max",
582 .data = &pid_max,
583 .maxlen = sizeof (int),
584 .mode = 0644,
585 .proc_handler = &proc_dointvec_minmax,
586 .strategy = sysctl_intvec,
587 .extra1 = &pid_max_min,
588 .extra2 = &pid_max_max,
589 },
590 {
591 .ctl_name = KERN_PANIC_ON_OOPS,
592 .procname = "panic_on_oops",
593 .data = &panic_on_oops,
594 .maxlen = sizeof(int),
595 .mode = 0644,
596 .proc_handler = &proc_dointvec,
597 },
598 {
599 .ctl_name = KERN_PRINTK_RATELIMIT,
600 .procname = "printk_ratelimit",
601 .data = &printk_ratelimit_jiffies,
602 .maxlen = sizeof(int),
603 .mode = 0644,
604 .proc_handler = &proc_dointvec_jiffies,
605 .strategy = &sysctl_jiffies,
606 },
607 {
608 .ctl_name = KERN_PRINTK_RATELIMIT_BURST,
609 .procname = "printk_ratelimit_burst",
610 .data = &printk_ratelimit_burst,
611 .maxlen = sizeof(int),
612 .mode = 0644,
613 .proc_handler = &proc_dointvec,
614 },
615 {
616 .ctl_name = KERN_NGROUPS_MAX,
617 .procname = "ngroups_max",
618 .data = &ngroups_max,
619 .maxlen = sizeof (int),
620 .mode = 0444,
621 .proc_handler = &proc_dointvec,
622 },
623 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
624 {
625 .ctl_name = KERN_UNKNOWN_NMI_PANIC,
626 .procname = "unknown_nmi_panic",
627 .data = &unknown_nmi_panic,
628 .maxlen = sizeof (int),
629 .mode = 0644,
630 .proc_handler = &proc_unknown_nmi_panic,
631 },
632 #endif
633 #if defined(CONFIG_X86)
634 {
635 .ctl_name = KERN_BOOTLOADER_TYPE,
636 .procname = "bootloader_type",
637 .data = &bootloader_type,
638 .maxlen = sizeof (int),
639 .mode = 0444,
640 .proc_handler = &proc_dointvec,
641 },
642 #endif
643 {
644 .ctl_name = KERN_RANDOMIZE,
645 .procname = "randomize_va_space",
646 .data = &randomize_va_space,
647 .maxlen = sizeof(int),
648 .mode = 0644,
649 .proc_handler = &proc_dointvec,
650 },
651 #if defined(CONFIG_ARCH_S390)
652 {
653 .ctl_name = KERN_SPIN_RETRY,
654 .procname = "spin_retry",
655 .data = &spin_retry,
656 .maxlen = sizeof (int),
657 .mode = 0644,
658 .proc_handler = &proc_dointvec,
659 },
660 #endif
661 { .ctl_name = 0 }
662 };
663
664 /* Constants for minimum and maximum testing in vm_table.
665 We use these as one-element integer vectors. */
666 static int zero;
667 static int one_hundred = 100;
668
669
670 static ctl_table vm_table[] = {
671 {
672 .ctl_name = VM_OVERCOMMIT_MEMORY,
673 .procname = "overcommit_memory",
674 .data = &sysctl_overcommit_memory,
675 .maxlen = sizeof(sysctl_overcommit_memory),
676 .mode = 0644,
677 .proc_handler = &proc_dointvec,
678 },
679 {
680 .ctl_name = VM_OVERCOMMIT_RATIO,
681 .procname = "overcommit_ratio",
682 .data = &sysctl_overcommit_ratio,
683 .maxlen = sizeof(sysctl_overcommit_ratio),
684 .mode = 0644,
685 .proc_handler = &proc_dointvec,
686 },
687 {
688 .ctl_name = VM_PAGE_CLUSTER,
689 .procname = "page-cluster",
690 .data = &page_cluster,
691 .maxlen = sizeof(int),
692 .mode = 0644,
693 .proc_handler = &proc_dointvec,
694 },
695 {
696 .ctl_name = VM_DIRTY_BACKGROUND,
697 .procname = "dirty_background_ratio",
698 .data = &dirty_background_ratio,
699 .maxlen = sizeof(dirty_background_ratio),
700 .mode = 0644,
701 .proc_handler = &proc_dointvec_minmax,
702 .strategy = &sysctl_intvec,
703 .extra1 = &zero,
704 .extra2 = &one_hundred,
705 },
706 {
707 .ctl_name = VM_DIRTY_RATIO,
708 .procname = "dirty_ratio",
709 .data = &vm_dirty_ratio,
710 .maxlen = sizeof(vm_dirty_ratio),
711 .mode = 0644,
712 .proc_handler = &proc_dointvec_minmax,
713 .strategy = &sysctl_intvec,
714 .extra1 = &zero,
715 .extra2 = &one_hundred,
716 },
717 {
718 .ctl_name = VM_DIRTY_WB_CS,
719 .procname = "dirty_writeback_centisecs",
720 .data = &dirty_writeback_centisecs,
721 .maxlen = sizeof(dirty_writeback_centisecs),
722 .mode = 0644,
723 .proc_handler = &dirty_writeback_centisecs_handler,
724 },
725 {
726 .ctl_name = VM_DIRTY_EXPIRE_CS,
727 .procname = "dirty_expire_centisecs",
728 .data = &dirty_expire_centisecs,
729 .maxlen = sizeof(dirty_expire_centisecs),
730 .mode = 0644,
731 .proc_handler = &proc_dointvec,
732 },
733 {
734 .ctl_name = VM_NR_PDFLUSH_THREADS,
735 .procname = "nr_pdflush_threads",
736 .data = &nr_pdflush_threads,
737 .maxlen = sizeof nr_pdflush_threads,
738 .mode = 0444 /* read-only*/,
739 .proc_handler = &proc_dointvec,
740 },
741 {
742 .ctl_name = VM_SWAPPINESS,
743 .procname = "swappiness",
744 .data = &vm_swappiness,
745 .maxlen = sizeof(vm_swappiness),
746 .mode = 0644,
747 .proc_handler = &proc_dointvec_minmax,
748 .strategy = &sysctl_intvec,
749 .extra1 = &zero,
750 .extra2 = &one_hundred,
751 },
752 #ifdef CONFIG_HUGETLB_PAGE
753 {
754 .ctl_name = VM_HUGETLB_PAGES,
755 .procname = "nr_hugepages",
756 .data = &max_huge_pages,
757 .maxlen = sizeof(unsigned long),
758 .mode = 0644,
759 .proc_handler = &hugetlb_sysctl_handler,
760 .extra1 = (void *)&hugetlb_zero,
761 .extra2 = (void *)&hugetlb_infinity,
762 },
763 {
764 .ctl_name = VM_HUGETLB_GROUP,
765 .procname = "hugetlb_shm_group",
766 .data = &sysctl_hugetlb_shm_group,
767 .maxlen = sizeof(gid_t),
768 .mode = 0644,
769 .proc_handler = &proc_dointvec,
770 },
771 #endif
772 {
773 .ctl_name = VM_LOWMEM_RESERVE_RATIO,
774 .procname = "lowmem_reserve_ratio",
775 .data = &sysctl_lowmem_reserve_ratio,
776 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
777 .mode = 0644,
778 .proc_handler = &lowmem_reserve_ratio_sysctl_handler,
779 .strategy = &sysctl_intvec,
780 },
781 {
782 .ctl_name = VM_MIN_FREE_KBYTES,
783 .procname = "min_free_kbytes",
784 .data = &min_free_kbytes,
785 .maxlen = sizeof(min_free_kbytes),
786 .mode = 0644,
787 .proc_handler = &min_free_kbytes_sysctl_handler,
788 .strategy = &sysctl_intvec,
789 .extra1 = &zero,
790 },
791 #ifdef CONFIG_MMU
792 {
793 .ctl_name = VM_MAX_MAP_COUNT,
794 .procname = "max_map_count",
795 .data = &sysctl_max_map_count,
796 .maxlen = sizeof(sysctl_max_map_count),
797 .mode = 0644,
798 .proc_handler = &proc_dointvec
799 },
800 #endif
801 {
802 .ctl_name = VM_LAPTOP_MODE,
803 .procname = "laptop_mode",
804 .data = &laptop_mode,
805 .maxlen = sizeof(laptop_mode),
806 .mode = 0644,
807 .proc_handler = &proc_dointvec,
808 .strategy = &sysctl_intvec,
809 .extra1 = &zero,
810 },
811 {
812 .ctl_name = VM_BLOCK_DUMP,
813 .procname = "block_dump",
814 .data = &block_dump,
815 .maxlen = sizeof(block_dump),
816 .mode = 0644,
817 .proc_handler = &proc_dointvec,
818 .strategy = &sysctl_intvec,
819 .extra1 = &zero,
820 },
821 {
822 .ctl_name = VM_VFS_CACHE_PRESSURE,
823 .procname = "vfs_cache_pressure",
824 .data = &sysctl_vfs_cache_pressure,
825 .maxlen = sizeof(sysctl_vfs_cache_pressure),
826 .mode = 0644,
827 .proc_handler = &proc_dointvec,
828 .strategy = &sysctl_intvec,
829 .extra1 = &zero,
830 },
831 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
832 {
833 .ctl_name = VM_LEGACY_VA_LAYOUT,
834 .procname = "legacy_va_layout",
835 .data = &sysctl_legacy_va_layout,
836 .maxlen = sizeof(sysctl_legacy_va_layout),
837 .mode = 0644,
838 .proc_handler = &proc_dointvec,
839 .strategy = &sysctl_intvec,
840 .extra1 = &zero,
841 },
842 #endif
843 #ifdef CONFIG_SWAP
844 {
845 .ctl_name = VM_SWAP_TOKEN_TIMEOUT,
846 .procname = "swap_token_timeout",
847 .data = &swap_token_default_timeout,
848 .maxlen = sizeof(swap_token_default_timeout),
849 .mode = 0644,
850 .proc_handler = &proc_dointvec_jiffies,
851 .strategy = &sysctl_jiffies,
852 },
853 #endif
854 { .ctl_name = 0 }
855 };
856
857 static ctl_table proc_table[] = {
858 { .ctl_name = 0 }
859 };
860
861 static ctl_table fs_table[] = {
862 {
863 .ctl_name = FS_NRINODE,
864 .procname = "inode-nr",
865 .data = &inodes_stat,
866 .maxlen = 2*sizeof(int),
867 .mode = 0444,
868 .proc_handler = &proc_dointvec,
869 },
870 {
871 .ctl_name = FS_STATINODE,
872 .procname = "inode-state",
873 .data = &inodes_stat,
874 .maxlen = 7*sizeof(int),
875 .mode = 0444,
876 .proc_handler = &proc_dointvec,
877 },
878 {
879 .ctl_name = FS_NRFILE,
880 .procname = "file-nr",
881 .data = &files_stat,
882 .maxlen = 3*sizeof(int),
883 .mode = 0444,
884 .proc_handler = &proc_dointvec,
885 },
886 {
887 .ctl_name = FS_MAXFILE,
888 .procname = "file-max",
889 .data = &files_stat.max_files,
890 .maxlen = sizeof(int),
891 .mode = 0644,
892 .proc_handler = &proc_dointvec,
893 },
894 {
895 .ctl_name = FS_DENTRY,
896 .procname = "dentry-state",
897 .data = &dentry_stat,
898 .maxlen = 6*sizeof(int),
899 .mode = 0444,
900 .proc_handler = &proc_dointvec,
901 },
902 {
903 .ctl_name = FS_OVERFLOWUID,
904 .procname = "overflowuid",
905 .data = &fs_overflowuid,
906 .maxlen = sizeof(int),
907 .mode = 0644,
908 .proc_handler = &proc_dointvec_minmax,
909 .strategy = &sysctl_intvec,
910 .extra1 = &minolduid,
911 .extra2 = &maxolduid,
912 },
913 {
914 .ctl_name = FS_OVERFLOWGID,
915 .procname = "overflowgid",
916 .data = &fs_overflowgid,
917 .maxlen = sizeof(int),
918 .mode = 0644,
919 .proc_handler = &proc_dointvec_minmax,
920 .strategy = &sysctl_intvec,
921 .extra1 = &minolduid,
922 .extra2 = &maxolduid,
923 },
924 {
925 .ctl_name = FS_LEASES,
926 .procname = "leases-enable",
927 .data = &leases_enable,
928 .maxlen = sizeof(int),
929 .mode = 0644,
930 .proc_handler = &proc_dointvec,
931 },
932 #ifdef CONFIG_DNOTIFY
933 {
934 .ctl_name = FS_DIR_NOTIFY,
935 .procname = "dir-notify-enable",
936 .data = &dir_notify_enable,
937 .maxlen = sizeof(int),
938 .mode = 0644,
939 .proc_handler = &proc_dointvec,
940 },
941 #endif
942 #ifdef CONFIG_MMU
943 {
944 .ctl_name = FS_LEASE_TIME,
945 .procname = "lease-break-time",
946 .data = &lease_break_time,
947 .maxlen = sizeof(int),
948 .mode = 0644,
949 .proc_handler = &proc_dointvec,
950 },
951 {
952 .ctl_name = FS_AIO_NR,
953 .procname = "aio-nr",
954 .data = &aio_nr,
955 .maxlen = sizeof(aio_nr),
956 .mode = 0444,
957 .proc_handler = &proc_dointvec,
958 },
959 {
960 .ctl_name = FS_AIO_MAX_NR,
961 .procname = "aio-max-nr",
962 .data = &aio_max_nr,
963 .maxlen = sizeof(aio_max_nr),
964 .mode = 0644,
965 .proc_handler = &proc_dointvec,
966 },
967 #ifdef CONFIG_INOTIFY
968 {
969 .ctl_name = FS_INOTIFY,
970 .procname = "inotify",
971 .mode = 0555,
972 .child = inotify_table,
973 },
974 #endif
975 #endif
976 {
977 .ctl_name = KERN_SETUID_DUMPABLE,
978 .procname = "suid_dumpable",
979 .data = &suid_dumpable,
980 .maxlen = sizeof(int),
981 .mode = 0644,
982 .proc_handler = &proc_dointvec,
983 },
984 { .ctl_name = 0 }
985 };
986
987 static ctl_table debug_table[] = {
988 { .ctl_name = 0 }
989 };
990
991 static ctl_table dev_table[] = {
992 { .ctl_name = 0 }
993 };
994
995 extern void init_irq_proc (void);
996
997 void __init sysctl_init(void)
998 {
999 #ifdef CONFIG_PROC_FS
1000 register_proc_table(root_table, proc_sys_root);
1001 init_irq_proc();
1002 #endif
1003 }
1004
1005 int do_sysctl(int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp,
1006 void __user *newval, size_t newlen)
1007 {
1008 struct list_head *tmp;
1009
1010 if (nlen <= 0 || nlen >= CTL_MAXNAME)
1011 return -ENOTDIR;
1012 if (oldval) {
1013 int old_len;
1014 if (!oldlenp || get_user(old_len, oldlenp))
1015 return -EFAULT;
1016 }
1017 tmp = &root_table_header.ctl_entry;
1018 do {
1019 struct ctl_table_header *head =
1020 list_entry(tmp, struct ctl_table_header, ctl_entry);
1021 void *context = NULL;
1022 int error = parse_table(name, nlen, oldval, oldlenp,
1023 newval, newlen, head->ctl_table,
1024 &context);
1025 kfree(context);
1026 if (error != -ENOTDIR)
1027 return error;
1028 tmp = tmp->next;
1029 } while (tmp != &root_table_header.ctl_entry);
1030 return -ENOTDIR;
1031 }
1032
1033 asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
1034 {
1035 struct __sysctl_args tmp;
1036 int error;
1037
1038 if (copy_from_user(&tmp, args, sizeof(tmp)))
1039 return -EFAULT;
1040
1041 lock_kernel();
1042 error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp,
1043 tmp.newval, tmp.newlen);
1044 unlock_kernel();
1045 return error;
1046 }
1047
1048 /*
1049 * ctl_perm does NOT grant the superuser all rights automatically, because
1050 * some sysctl variables are readonly even to root.
1051 */
1052
1053 static int test_perm(int mode, int op)
1054 {
1055 if (!current->euid)
1056 mode >>= 6;
1057 else if (in_egroup_p(0))
1058 mode >>= 3;
1059 if ((mode & op & 0007) == op)
1060 return 0;
1061 return -EACCES;
1062 }
1063
1064 static inline int ctl_perm(ctl_table *table, int op)
1065 {
1066 int error;
1067 error = security_sysctl(table, op);
1068 if (error)
1069 return error;
1070 return test_perm(table->mode, op);
1071 }
1072
1073 static int parse_table(int __user *name, int nlen,
1074 void __user *oldval, size_t __user *oldlenp,
1075 void __user *newval, size_t newlen,
1076 ctl_table *table, void **context)
1077 {
1078 int n;
1079 repeat:
1080 if (!nlen)
1081 return -ENOTDIR;
1082 if (get_user(n, name))
1083 return -EFAULT;
1084 for ( ; table->ctl_name; table++) {
1085 if (n == table->ctl_name || table->ctl_name == CTL_ANY) {
1086 int error;
1087 if (table->child) {
1088 if (ctl_perm(table, 001))
1089 return -EPERM;
1090 if (table->strategy) {
1091 error = table->strategy(
1092 table, name, nlen,
1093 oldval, oldlenp,
1094 newval, newlen, context);
1095 if (error)
1096 return error;
1097 }
1098 name++;
1099 nlen--;
1100 table = table->child;
1101 goto repeat;
1102 }
1103 error = do_sysctl_strategy(table, name, nlen,
1104 oldval, oldlenp,
1105 newval, newlen, context);
1106 return error;
1107 }
1108 }
1109 return -ENOTDIR;
1110 }
1111
1112 /* Perform the actual read/write of a sysctl table entry. */
1113 int do_sysctl_strategy (ctl_table *table,
1114 int __user *name, int nlen,
1115 void __user *oldval, size_t __user *oldlenp,
1116 void __user *newval, size_t newlen, void **context)
1117 {
1118 int op = 0, rc;
1119 size_t len;
1120
1121 if (oldval)
1122 op |= 004;
1123 if (newval)
1124 op |= 002;
1125 if (ctl_perm(table, op))
1126 return -EPERM;
1127
1128 if (table->strategy) {
1129 rc = table->strategy(table, name, nlen, oldval, oldlenp,
1130 newval, newlen, context);
1131 if (rc < 0)
1132 return rc;
1133 if (rc > 0)
1134 return 0;
1135 }
1136
1137 /* If there is no strategy routine, or if the strategy returns
1138 * zero, proceed with automatic r/w */
1139 if (table->data && table->maxlen) {
1140 if (oldval && oldlenp) {
1141 if (get_user(len, oldlenp))
1142 return -EFAULT;
1143 if (len) {
1144 if (len > table->maxlen)
1145 len = table->maxlen;
1146 if(copy_to_user(oldval, table->data, len))
1147 return -EFAULT;
1148 if(put_user(len, oldlenp))
1149 return -EFAULT;
1150 }
1151 }
1152 if (newval && newlen) {
1153 len = newlen;
1154 if (len > table->maxlen)
1155 len = table->maxlen;
1156 if(copy_from_user(table->data, newval, len))
1157 return -EFAULT;
1158 }
1159 }
1160 return 0;
1161 }
1162
1163 /**
1164 * register_sysctl_table - register a sysctl hierarchy
1165 * @table: the top-level table structure
1166 * @insert_at_head: whether the entry should be inserted in front or at the end
1167 *
1168 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1169 * array. An entry with a ctl_name of 0 terminates the table.
1170 *
1171 * The members of the &ctl_table structure are used as follows:
1172 *
1173 * ctl_name - This is the numeric sysctl value used by sysctl(2). The number
1174 * must be unique within that level of sysctl
1175 *
1176 * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1177 * enter a sysctl file
1178 *
1179 * data - a pointer to data for use by proc_handler
1180 *
1181 * maxlen - the maximum size in bytes of the data
1182 *
1183 * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1184 *
1185 * child - a pointer to the child sysctl table if this entry is a directory, or
1186 * %NULL.
1187 *
1188 * proc_handler - the text handler routine (described below)
1189 *
1190 * strategy - the strategy routine (described below)
1191 *
1192 * de - for internal use by the sysctl routines
1193 *
1194 * extra1, extra2 - extra pointers usable by the proc handler routines
1195 *
1196 * Leaf nodes in the sysctl tree will be represented by a single file
1197 * under /proc; non-leaf nodes will be represented by directories.
1198 *
1199 * sysctl(2) can automatically manage read and write requests through
1200 * the sysctl table. The data and maxlen fields of the ctl_table
1201 * struct enable minimal validation of the values being written to be
1202 * performed, and the mode field allows minimal authentication.
1203 *
1204 * More sophisticated management can be enabled by the provision of a
1205 * strategy routine with the table entry. This will be called before
1206 * any automatic read or write of the data is performed.
1207 *
1208 * The strategy routine may return
1209 *
1210 * < 0 - Error occurred (error is passed to user process)
1211 *
1212 * 0 - OK - proceed with automatic read or write.
1213 *
1214 * > 0 - OK - read or write has been done by the strategy routine, so
1215 * return immediately.
1216 *
1217 * There must be a proc_handler routine for any terminal nodes
1218 * mirrored under /proc/sys (non-terminals are handled by a built-in
1219 * directory handler). Several default handlers are available to
1220 * cover common cases -
1221 *
1222 * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
1223 * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(),
1224 * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
1225 *
1226 * It is the handler's job to read the input buffer from user memory
1227 * and process it. The handler should return 0 on success.
1228 *
1229 * This routine returns %NULL on a failure to register, and a pointer
1230 * to the table header on success.
1231 */
1232 struct ctl_table_header *register_sysctl_table(ctl_table * table,
1233 int insert_at_head)
1234 {
1235 struct ctl_table_header *tmp;
1236 tmp = kmalloc(sizeof(struct ctl_table_header), GFP_KERNEL);
1237 if (!tmp)
1238 return NULL;
1239 tmp->ctl_table = table;
1240 INIT_LIST_HEAD(&tmp->ctl_entry);
1241 if (insert_at_head)
1242 list_add(&tmp->ctl_entry, &root_table_header.ctl_entry);
1243 else
1244 list_add_tail(&tmp->ctl_entry, &root_table_header.ctl_entry);
1245 #ifdef CONFIG_PROC_FS
1246 register_proc_table(table, proc_sys_root);
1247 #endif
1248 return tmp;
1249 }
1250
1251 /**
1252 * unregister_sysctl_table - unregister a sysctl table hierarchy
1253 * @header: the header returned from register_sysctl_table
1254 *
1255 * Unregisters the sysctl table and all children. proc entries may not
1256 * actually be removed until they are no longer used by anyone.
1257 */
1258 void unregister_sysctl_table(struct ctl_table_header * header)
1259 {
1260 list_del(&header->ctl_entry);
1261 #ifdef CONFIG_PROC_FS
1262 unregister_proc_table(header->ctl_table, proc_sys_root);
1263 #endif
1264 kfree(header);
1265 }
1266
1267 /*
1268 * /proc/sys support
1269 */
1270
1271 #ifdef CONFIG_PROC_FS
1272
1273 /* Scan the sysctl entries in table and add them all into /proc */
1274 static void register_proc_table(ctl_table * table, struct proc_dir_entry *root)
1275 {
1276 struct proc_dir_entry *de;
1277 int len;
1278 mode_t mode;
1279
1280 for (; table->ctl_name; table++) {
1281 /* Can't do anything without a proc name. */
1282 if (!table->procname)
1283 continue;
1284 /* Maybe we can't do anything with it... */
1285 if (!table->proc_handler && !table->child) {
1286 printk(KERN_WARNING "SYSCTL: Can't register %s\n",
1287 table->procname);
1288 continue;
1289 }
1290
1291 len = strlen(table->procname);
1292 mode = table->mode;
1293
1294 de = NULL;
1295 if (table->proc_handler)
1296 mode |= S_IFREG;
1297 else {
1298 mode |= S_IFDIR;
1299 for (de = root->subdir; de; de = de->next) {
1300 if (proc_match(len, table->procname, de))
1301 break;
1302 }
1303 /* If the subdir exists already, de is non-NULL */
1304 }
1305
1306 if (!de) {
1307 de = create_proc_entry(table->procname, mode, root);
1308 if (!de)
1309 continue;
1310 de->data = (void *) table;
1311 if (table->proc_handler)
1312 de->proc_fops = &proc_sys_file_operations;
1313 }
1314 table->de = de;
1315 if (de->mode & S_IFDIR)
1316 register_proc_table(table->child, de);
1317 }
1318 }
1319
1320 /*
1321 * Unregister a /proc sysctl table and any subdirectories.
1322 */
1323 static void unregister_proc_table(ctl_table * table, struct proc_dir_entry *root)
1324 {
1325 struct proc_dir_entry *de;
1326 for (; table->ctl_name; table++) {
1327 if (!(de = table->de))
1328 continue;
1329 if (de->mode & S_IFDIR) {
1330 if (!table->child) {
1331 printk (KERN_ALERT "Help - malformed sysctl tree on free\n");
1332 continue;
1333 }
1334 unregister_proc_table(table->child, de);
1335
1336 /* Don't unregister directories which still have entries.. */
1337 if (de->subdir)
1338 continue;
1339 }
1340
1341 /* Don't unregister proc entries that are still being used.. */
1342 if (atomic_read(&de->count))
1343 continue;
1344
1345 table->de = NULL;
1346 remove_proc_entry(table->procname, root);
1347 }
1348 }
1349
1350 static ssize_t do_rw_proc(int write, struct file * file, char __user * buf,
1351 size_t count, loff_t *ppos)
1352 {
1353 int op;
1354 struct proc_dir_entry *de;
1355 struct ctl_table *table;
1356 size_t res;
1357 ssize_t error;
1358
1359 de = PDE(file->f_dentry->d_inode);
1360 if (!de || !de->data)
1361 return -ENOTDIR;
1362 table = (struct ctl_table *) de->data;
1363 if (!table || !table->proc_handler)
1364 return -ENOTDIR;
1365 op = (write ? 002 : 004);
1366 if (ctl_perm(table, op))
1367 return -EPERM;
1368
1369 res = count;
1370
1371 error = (*table->proc_handler) (table, write, file, buf, &res, ppos);
1372 if (error)
1373 return error;
1374 return res;
1375 }
1376
1377 static int proc_opensys(struct inode *inode, struct file *file)
1378 {
1379 if (file->f_mode & FMODE_WRITE) {
1380 /*
1381 * sysctl entries that are not writable,
1382 * are _NOT_ writable, capabilities or not.
1383 */
1384 if (!(inode->i_mode & S_IWUSR))
1385 return -EPERM;
1386 }
1387
1388 return 0;
1389 }
1390
1391 static ssize_t proc_readsys(struct file * file, char __user * buf,
1392 size_t count, loff_t *ppos)
1393 {
1394 return do_rw_proc(0, file, buf, count, ppos);
1395 }
1396
1397 static ssize_t proc_writesys(struct file * file, const char __user * buf,
1398 size_t count, loff_t *ppos)
1399 {
1400 return do_rw_proc(1, file, (char __user *) buf, count, ppos);
1401 }
1402
1403 /**
1404 * proc_dostring - read a string sysctl
1405 * @table: the sysctl table
1406 * @write: %TRUE if this is a write to the sysctl file
1407 * @filp: the file structure
1408 * @buffer: the user buffer
1409 * @lenp: the size of the user buffer
1410 * @ppos: file position
1411 *
1412 * Reads/writes a string from/to the user buffer. If the kernel
1413 * buffer provided is not large enough to hold the string, the
1414 * string is truncated. The copied string is %NULL-terminated.
1415 * If the string is being read by the user process, it is copied
1416 * and a newline '\n' is added. It is truncated if the buffer is
1417 * not large enough.
1418 *
1419 * Returns 0 on success.
1420 */
1421 int proc_dostring(ctl_table *table, int write, struct file *filp,
1422 void __user *buffer, size_t *lenp, loff_t *ppos)
1423 {
1424 size_t len;
1425 char __user *p;
1426 char c;
1427
1428 if (!table->data || !table->maxlen || !*lenp ||
1429 (*ppos && !write)) {
1430 *lenp = 0;
1431 return 0;
1432 }
1433
1434 if (write) {
1435 len = 0;
1436 p = buffer;
1437 while (len < *lenp) {
1438 if (get_user(c, p++))
1439 return -EFAULT;
1440 if (c == 0 || c == '\n')
1441 break;
1442 len++;
1443 }
1444 if (len >= table->maxlen)
1445 len = table->maxlen-1;
1446 if(copy_from_user(table->data, buffer, len))
1447 return -EFAULT;
1448 ((char *) table->data)[len] = 0;
1449 *ppos += *lenp;
1450 } else {
1451 len = strlen(table->data);
1452 if (len > table->maxlen)
1453 len = table->maxlen;
1454 if (len > *lenp)
1455 len = *lenp;
1456 if (len)
1457 if(copy_to_user(buffer, table->data, len))
1458 return -EFAULT;
1459 if (len < *lenp) {
1460 if(put_user('\n', ((char __user *) buffer) + len))
1461 return -EFAULT;
1462 len++;
1463 }
1464 *lenp = len;
1465 *ppos += len;
1466 }
1467 return 0;
1468 }
1469
1470 /*
1471 * Special case of dostring for the UTS structure. This has locks
1472 * to observe. Should this be in kernel/sys.c ????
1473 */
1474
1475 static int proc_doutsstring(ctl_table *table, int write, struct file *filp,
1476 void __user *buffer, size_t *lenp, loff_t *ppos)
1477 {
1478 int r;
1479
1480 if (!write) {
1481 down_read(&uts_sem);
1482 r=proc_dostring(table,0,filp,buffer,lenp, ppos);
1483 up_read(&uts_sem);
1484 } else {
1485 down_write(&uts_sem);
1486 r=proc_dostring(table,1,filp,buffer,lenp, ppos);
1487 up_write(&uts_sem);
1488 }
1489 return r;
1490 }
1491
1492 static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp,
1493 int *valp,
1494 int write, void *data)
1495 {
1496 if (write) {
1497 *valp = *negp ? -*lvalp : *lvalp;
1498 } else {
1499 int val = *valp;
1500 if (val < 0) {
1501 *negp = -1;
1502 *lvalp = (unsigned long)-val;
1503 } else {
1504 *negp = 0;
1505 *lvalp = (unsigned long)val;
1506 }
1507 }
1508 return 0;
1509 }
1510
1511 static int do_proc_dointvec(ctl_table *table, int write, struct file *filp,
1512 void __user *buffer, size_t *lenp, loff_t *ppos,
1513 int (*conv)(int *negp, unsigned long *lvalp, int *valp,
1514 int write, void *data),
1515 void *data)
1516 {
1517 #define TMPBUFLEN 21
1518 int *i, vleft, first=1, neg, val;
1519 unsigned long lval;
1520 size_t left, len;
1521
1522 char buf[TMPBUFLEN], *p;
1523 char __user *s = buffer;
1524
1525 if (!table->data || !table->maxlen || !*lenp ||
1526 (*ppos && !write)) {
1527 *lenp = 0;
1528 return 0;
1529 }
1530
1531 i = (int *) table->data;
1532 vleft = table->maxlen / sizeof(*i);
1533 left = *lenp;
1534
1535 if (!conv)
1536 conv = do_proc_dointvec_conv;
1537
1538 for (; left && vleft--; i++, first=0) {
1539 if (write) {
1540 while (left) {
1541 char c;
1542 if (get_user(c, s))
1543 return -EFAULT;
1544 if (!isspace(c))
1545 break;
1546 left--;
1547 s++;
1548 }
1549 if (!left)
1550 break;
1551 neg = 0;
1552 len = left;
1553 if (len > sizeof(buf) - 1)
1554 len = sizeof(buf) - 1;
1555 if (copy_from_user(buf, s, len))
1556 return -EFAULT;
1557 buf[len] = 0;
1558 p = buf;
1559 if (*p == '-' && left > 1) {
1560 neg = 1;
1561 left--, p++;
1562 }
1563 if (*p < '0' || *p > '9')
1564 break;
1565
1566 lval = simple_strtoul(p, &p, 0);
1567
1568 len = p-buf;
1569 if ((len < left) && *p && !isspace(*p))
1570 break;
1571 if (neg)
1572 val = -val;
1573 s += len;
1574 left -= len;
1575
1576 if (conv(&neg, &lval, i, 1, data))
1577 break;
1578 } else {
1579 p = buf;
1580 if (!first)
1581 *p++ = '\t';
1582
1583 if (conv(&neg, &lval, i, 0, data))
1584 break;
1585
1586 sprintf(p, "%s%lu", neg ? "-" : "", lval);
1587 len = strlen(buf);
1588 if (len > left)
1589 len = left;
1590 if(copy_to_user(s, buf, len))
1591 return -EFAULT;
1592 left -= len;
1593 s += len;
1594 }
1595 }
1596
1597 if (!write && !first && left) {
1598 if(put_user('\n', s))
1599 return -EFAULT;
1600 left--, s++;
1601 }
1602 if (write) {
1603 while (left) {
1604 char c;
1605 if (get_user(c, s++))
1606 return -EFAULT;
1607 if (!isspace(c))
1608 break;
1609 left--;
1610 }
1611 }
1612 if (write && first)
1613 return -EINVAL;
1614 *lenp -= left;
1615 *ppos += *lenp;
1616 return 0;
1617 #undef TMPBUFLEN
1618 }
1619
1620 /**
1621 * proc_dointvec - read a vector of integers
1622 * @table: the sysctl table
1623 * @write: %TRUE if this is a write to the sysctl file
1624 * @filp: the file structure
1625 * @buffer: the user buffer
1626 * @lenp: the size of the user buffer
1627 * @ppos: file position
1628 *
1629 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1630 * values from/to the user buffer, treated as an ASCII string.
1631 *
1632 * Returns 0 on success.
1633 */
1634 int proc_dointvec(ctl_table *table, int write, struct file *filp,
1635 void __user *buffer, size_t *lenp, loff_t *ppos)
1636 {
1637 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
1638 NULL,NULL);
1639 }
1640
1641 #define OP_SET 0
1642 #define OP_AND 1
1643 #define OP_OR 2
1644 #define OP_MAX 3
1645 #define OP_MIN 4
1646
1647 static int do_proc_dointvec_bset_conv(int *negp, unsigned long *lvalp,
1648 int *valp,
1649 int write, void *data)
1650 {
1651 int op = *(int *)data;
1652 if (write) {
1653 int val = *negp ? -*lvalp : *lvalp;
1654 switch(op) {
1655 case OP_SET: *valp = val; break;
1656 case OP_AND: *valp &= val; break;
1657 case OP_OR: *valp |= val; break;
1658 case OP_MAX: if(*valp < val)
1659 *valp = val;
1660 break;
1661 case OP_MIN: if(*valp > val)
1662 *valp = val;
1663 break;
1664 }
1665 } else {
1666 int val = *valp;
1667 if (val < 0) {
1668 *negp = -1;
1669 *lvalp = (unsigned long)-val;
1670 } else {
1671 *negp = 0;
1672 *lvalp = (unsigned long)val;
1673 }
1674 }
1675 return 0;
1676 }
1677
1678 /*
1679 * init may raise the set.
1680 */
1681
1682 int proc_dointvec_bset(ctl_table *table, int write, struct file *filp,
1683 void __user *buffer, size_t *lenp, loff_t *ppos)
1684 {
1685 int op;
1686
1687 if (!capable(CAP_SYS_MODULE)) {
1688 return -EPERM;
1689 }
1690
1691 op = (current->pid == 1) ? OP_SET : OP_AND;
1692 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
1693 do_proc_dointvec_bset_conv,&op);
1694 }
1695
1696 struct do_proc_dointvec_minmax_conv_param {
1697 int *min;
1698 int *max;
1699 };
1700
1701 static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp,
1702 int *valp,
1703 int write, void *data)
1704 {
1705 struct do_proc_dointvec_minmax_conv_param *param = data;
1706 if (write) {
1707 int val = *negp ? -*lvalp : *lvalp;
1708 if ((param->min && *param->min > val) ||
1709 (param->max && *param->max < val))
1710 return -EINVAL;
1711 *valp = val;
1712 } else {
1713 int val = *valp;
1714 if (val < 0) {
1715 *negp = -1;
1716 *lvalp = (unsigned long)-val;
1717 } else {
1718 *negp = 0;
1719 *lvalp = (unsigned long)val;
1720 }
1721 }
1722 return 0;
1723 }
1724
1725 /**
1726 * proc_dointvec_minmax - read a vector of integers with min/max values
1727 * @table: the sysctl table
1728 * @write: %TRUE if this is a write to the sysctl file
1729 * @filp: the file structure
1730 * @buffer: the user buffer
1731 * @lenp: the size of the user buffer
1732 * @ppos: file position
1733 *
1734 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1735 * values from/to the user buffer, treated as an ASCII string.
1736 *
1737 * This routine will ensure the values are within the range specified by
1738 * table->extra1 (min) and table->extra2 (max).
1739 *
1740 * Returns 0 on success.
1741 */
1742 int proc_dointvec_minmax(ctl_table *table, int write, struct file *filp,
1743 void __user *buffer, size_t *lenp, loff_t *ppos)
1744 {
1745 struct do_proc_dointvec_minmax_conv_param param = {
1746 .min = (int *) table->extra1,
1747 .max = (int *) table->extra2,
1748 };
1749 return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
1750 do_proc_dointvec_minmax_conv, &param);
1751 }
1752
1753 static int do_proc_doulongvec_minmax(ctl_table *table, int write,
1754 struct file *filp,
1755 void __user *buffer,
1756 size_t *lenp, loff_t *ppos,
1757 unsigned long convmul,
1758 unsigned long convdiv)
1759 {
1760 #define TMPBUFLEN 21
1761 unsigned long *i, *min, *max, val;
1762 int vleft, first=1, neg;
1763 size_t len, left;
1764 char buf[TMPBUFLEN], *p;
1765 char __user *s = buffer;
1766
1767 if (!table->data || !table->maxlen || !*lenp ||
1768 (*ppos && !write)) {
1769 *lenp = 0;
1770 return 0;
1771 }
1772
1773 i = (unsigned long *) table->data;
1774 min = (unsigned long *) table->extra1;
1775 max = (unsigned long *) table->extra2;
1776 vleft = table->maxlen / sizeof(unsigned long);
1777 left = *lenp;
1778
1779 for (; left && vleft--; i++, min++, max++, first=0) {
1780 if (write) {
1781 while (left) {
1782 char c;
1783 if (get_user(c, s))
1784 return -EFAULT;
1785 if (!isspace(c))
1786 break;
1787 left--;
1788 s++;
1789 }
1790 if (!left)
1791 break;
1792 neg = 0;
1793 len = left;
1794 if (len > TMPBUFLEN-1)
1795 len = TMPBUFLEN-1;
1796 if (copy_from_user(buf, s, len))
1797 return -EFAULT;
1798 buf[len] = 0;
1799 p = buf;
1800 if (*p == '-' && left > 1) {
1801 neg = 1;
1802 left--, p++;
1803 }
1804 if (*p < '0' || *p > '9')
1805 break;
1806 val = simple_strtoul(p, &p, 0) * convmul / convdiv ;
1807 len = p-buf;
1808 if ((len < left) && *p && !isspace(*p))
1809 break;
1810 if (neg)
1811 val = -val;
1812 s += len;
1813 left -= len;
1814
1815 if(neg)
1816 continue;
1817 if ((min && val < *min) || (max && val > *max))
1818 continue;
1819 *i = val;
1820 } else {
1821 p = buf;
1822 if (!first)
1823 *p++ = '\t';
1824 sprintf(p, "%lu", convdiv * (*i) / convmul);
1825 len = strlen(buf);
1826 if (len > left)
1827 len = left;
1828 if(copy_to_user(s, buf, len))
1829 return -EFAULT;
1830 left -= len;
1831 s += len;
1832 }
1833 }
1834
1835 if (!write && !first && left) {
1836 if(put_user('\n', s))
1837 return -EFAULT;
1838 left--, s++;
1839 }
1840 if (write) {
1841 while (left) {
1842 char c;
1843 if (get_user(c, s++))
1844 return -EFAULT;
1845 if (!isspace(c))
1846 break;
1847 left--;
1848 }
1849 }
1850 if (write && first)
1851 return -EINVAL;
1852 *lenp -= left;
1853 *ppos += *lenp;
1854 return 0;
1855 #undef TMPBUFLEN
1856 }
1857
1858 /**
1859 * proc_doulongvec_minmax - read a vector of long integers with min/max values
1860 * @table: the sysctl table
1861 * @write: %TRUE if this is a write to the sysctl file
1862 * @filp: the file structure
1863 * @buffer: the user buffer
1864 * @lenp: the size of the user buffer
1865 * @ppos: file position
1866 *
1867 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
1868 * values from/to the user buffer, treated as an ASCII string.
1869 *
1870 * This routine will ensure the values are within the range specified by
1871 * table->extra1 (min) and table->extra2 (max).
1872 *
1873 * Returns 0 on success.
1874 */
1875 int proc_doulongvec_minmax(ctl_table *table, int write, struct file *filp,
1876 void __user *buffer, size_t *lenp, loff_t *ppos)
1877 {
1878 return do_proc_doulongvec_minmax(table, write, filp, buffer, lenp, ppos, 1l, 1l);
1879 }
1880
1881 /**
1882 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
1883 * @table: the sysctl table
1884 * @write: %TRUE if this is a write to the sysctl file
1885 * @filp: the file structure
1886 * @buffer: the user buffer
1887 * @lenp: the size of the user buffer
1888 * @ppos: file position
1889 *
1890 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
1891 * values from/to the user buffer, treated as an ASCII string. The values
1892 * are treated as milliseconds, and converted to jiffies when they are stored.
1893 *
1894 * This routine will ensure the values are within the range specified by
1895 * table->extra1 (min) and table->extra2 (max).
1896 *
1897 * Returns 0 on success.
1898 */
1899 int proc_doulongvec_ms_jiffies_minmax(ctl_table *table, int write,
1900 struct file *filp,
1901 void __user *buffer,
1902 size_t *lenp, loff_t *ppos)
1903 {
1904 return do_proc_doulongvec_minmax(table, write, filp, buffer,
1905 lenp, ppos, HZ, 1000l);
1906 }
1907
1908
1909 static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp,
1910 int *valp,
1911 int write, void *data)
1912 {
1913 if (write) {
1914 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
1915 } else {
1916 int val = *valp;
1917 unsigned long lval;
1918 if (val < 0) {
1919 *negp = -1;
1920 lval = (unsigned long)-val;
1921 } else {
1922 *negp = 0;
1923 lval = (unsigned long)val;
1924 }
1925 *lvalp = lval / HZ;
1926 }
1927 return 0;
1928 }
1929
1930 static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp,
1931 int *valp,
1932 int write, void *data)
1933 {
1934 if (write) {
1935 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
1936 } else {
1937 int val = *valp;
1938 unsigned long lval;
1939 if (val < 0) {
1940 *negp = -1;
1941 lval = (unsigned long)-val;
1942 } else {
1943 *negp = 0;
1944 lval = (unsigned long)val;
1945 }
1946 *lvalp = jiffies_to_clock_t(lval);
1947 }
1948 return 0;
1949 }
1950
1951 static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp,
1952 int *valp,
1953 int write, void *data)
1954 {
1955 if (write) {
1956 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
1957 } else {
1958 int val = *valp;
1959 unsigned long lval;
1960 if (val < 0) {
1961 *negp = -1;
1962 lval = (unsigned long)-val;
1963 } else {
1964 *negp = 0;
1965 lval = (unsigned long)val;
1966 }
1967 *lvalp = jiffies_to_msecs(lval);
1968 }
1969 return 0;
1970 }
1971
1972 /**
1973 * proc_dointvec_jiffies - read a vector of integers as seconds
1974 * @table: the sysctl table
1975 * @write: %TRUE if this is a write to the sysctl file
1976 * @filp: the file structure
1977 * @buffer: the user buffer
1978 * @lenp: the size of the user buffer
1979 * @ppos: file position
1980 *
1981 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1982 * values from/to the user buffer, treated as an ASCII string.
1983 * The values read are assumed to be in seconds, and are converted into
1984 * jiffies.
1985 *
1986 * Returns 0 on success.
1987 */
1988 int proc_dointvec_jiffies(ctl_table *table, int write, struct file *filp,
1989 void __user *buffer, size_t *lenp, loff_t *ppos)
1990 {
1991 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
1992 do_proc_dointvec_jiffies_conv,NULL);
1993 }
1994
1995 /**
1996 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
1997 * @table: the sysctl table
1998 * @write: %TRUE if this is a write to the sysctl file
1999 * @filp: the file structure
2000 * @buffer: the user buffer
2001 * @lenp: the size of the user buffer
2002 *
2003 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2004 * values from/to the user buffer, treated as an ASCII string.
2005 * The values read are assumed to be in 1/USER_HZ seconds, and
2006 * are converted into jiffies.
2007 *
2008 * Returns 0 on success.
2009 */
2010 int proc_dointvec_userhz_jiffies(ctl_table *table, int write, struct file *filp,
2011 void __user *buffer, size_t *lenp, loff_t *ppos)
2012 {
2013 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2014 do_proc_dointvec_userhz_jiffies_conv,NULL);
2015 }
2016
2017 /**
2018 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2019 * @table: the sysctl table
2020 * @write: %TRUE if this is a write to the sysctl file
2021 * @filp: the file structure
2022 * @buffer: the user buffer
2023 * @lenp: the size of the user buffer
2024 * @ppos: file position
2025 * @ppos: the current position in the file
2026 *
2027 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2028 * values from/to the user buffer, treated as an ASCII string.
2029 * The values read are assumed to be in 1/1000 seconds, and
2030 * are converted into jiffies.
2031 *
2032 * Returns 0 on success.
2033 */
2034 int proc_dointvec_ms_jiffies(ctl_table *table, int write, struct file *filp,
2035 void __user *buffer, size_t *lenp, loff_t *ppos)
2036 {
2037 return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2038 do_proc_dointvec_ms_jiffies_conv, NULL);
2039 }
2040
2041 #else /* CONFIG_PROC_FS */
2042
2043 int proc_dostring(ctl_table *table, int write, struct file *filp,
2044 void __user *buffer, size_t *lenp, loff_t *ppos)
2045 {
2046 return -ENOSYS;
2047 }
2048
2049 static int proc_doutsstring(ctl_table *table, int write, struct file *filp,
2050 void __user *buffer, size_t *lenp, loff_t *ppos)
2051 {
2052 return -ENOSYS;
2053 }
2054
2055 int proc_dointvec(ctl_table *table, int write, struct file *filp,
2056 void __user *buffer, size_t *lenp, loff_t *ppos)
2057 {
2058 return -ENOSYS;
2059 }
2060
2061 int proc_dointvec_bset(ctl_table *table, int write, struct file *filp,
2062 void __user *buffer, size_t *lenp, loff_t *ppos)
2063 {
2064 return -ENOSYS;
2065 }
2066
2067 int proc_dointvec_minmax(ctl_table *table, int write, struct file *filp,
2068 void __user *buffer, size_t *lenp, loff_t *ppos)
2069 {
2070 return -ENOSYS;
2071 }
2072
2073 int proc_dointvec_jiffies(ctl_table *table, int write, struct file *filp,
2074 void __user *buffer, size_t *lenp, loff_t *ppos)
2075 {
2076 return -ENOSYS;
2077 }
2078
2079 int proc_dointvec_userhz_jiffies(ctl_table *table, int write, struct file *filp,
2080 void __user *buffer, size_t *lenp, loff_t *ppos)
2081 {
2082 return -ENOSYS;
2083 }
2084
2085 int proc_dointvec_ms_jiffies(ctl_table *table, int write, struct file *filp,
2086 void __user *buffer, size_t *lenp, loff_t *ppos)
2087 {
2088 return -ENOSYS;
2089 }
2090
2091 int proc_doulongvec_minmax(ctl_table *table, int write, struct file *filp,
2092 void __user *buffer, size_t *lenp, loff_t *ppos)
2093 {
2094 return -ENOSYS;
2095 }
2096
2097 int proc_doulongvec_ms_jiffies_minmax(ctl_table *table, int write,
2098 struct file *filp,
2099 void __user *buffer,
2100 size_t *lenp, loff_t *ppos)
2101 {
2102 return -ENOSYS;
2103 }
2104
2105
2106 #endif /* CONFIG_PROC_FS */
2107
2108
2109 /*
2110 * General sysctl support routines
2111 */
2112
2113 /* The generic string strategy routine: */
2114 int sysctl_string(ctl_table *table, int __user *name, int nlen,
2115 void __user *oldval, size_t __user *oldlenp,
2116 void __user *newval, size_t newlen, void **context)
2117 {
2118 size_t l, len;
2119
2120 if (!table->data || !table->maxlen)
2121 return -ENOTDIR;
2122
2123 if (oldval && oldlenp) {
2124 if (get_user(len, oldlenp))
2125 return -EFAULT;
2126 if (len) {
2127 l = strlen(table->data);
2128 if (len > l) len = l;
2129 if (len >= table->maxlen)
2130 len = table->maxlen;
2131 if(copy_to_user(oldval, table->data, len))
2132 return -EFAULT;
2133 if(put_user(0, ((char __user *) oldval) + len))
2134 return -EFAULT;
2135 if(put_user(len, oldlenp))
2136 return -EFAULT;
2137 }
2138 }
2139 if (newval && newlen) {
2140 len = newlen;
2141 if (len > table->maxlen)
2142 len = table->maxlen;
2143 if(copy_from_user(table->data, newval, len))
2144 return -EFAULT;
2145 if (len == table->maxlen)
2146 len--;
2147 ((char *) table->data)[len] = 0;
2148 }
2149 return 0;
2150 }
2151
2152 /*
2153 * This function makes sure that all of the integers in the vector
2154 * are between the minimum and maximum values given in the arrays
2155 * table->extra1 and table->extra2, respectively.
2156 */
2157 int sysctl_intvec(ctl_table *table, int __user *name, int nlen,
2158 void __user *oldval, size_t __user *oldlenp,
2159 void __user *newval, size_t newlen, void **context)
2160 {
2161
2162 if (newval && newlen) {
2163 int __user *vec = (int __user *) newval;
2164 int *min = (int *) table->extra1;
2165 int *max = (int *) table->extra2;
2166 size_t length;
2167 int i;
2168
2169 if (newlen % sizeof(int) != 0)
2170 return -EINVAL;
2171
2172 if (!table->extra1 && !table->extra2)
2173 return 0;
2174
2175 if (newlen > table->maxlen)
2176 newlen = table->maxlen;
2177 length = newlen / sizeof(int);
2178
2179 for (i = 0; i < length; i++) {
2180 int value;
2181 if (get_user(value, vec + i))
2182 return -EFAULT;
2183 if (min && value < min[i])
2184 return -EINVAL;
2185 if (max && value > max[i])
2186 return -EINVAL;
2187 }
2188 }
2189 return 0;
2190 }
2191
2192 /* Strategy function to convert jiffies to seconds */
2193 int sysctl_jiffies(ctl_table *table, int __user *name, int nlen,
2194 void __user *oldval, size_t __user *oldlenp,
2195 void __user *newval, size_t newlen, void **context)
2196 {
2197 if (oldval) {
2198 size_t olen;
2199 if (oldlenp) {
2200 if (get_user(olen, oldlenp))
2201 return -EFAULT;
2202 if (olen!=sizeof(int))
2203 return -EINVAL;
2204 }
2205 if (put_user(*(int *)(table->data)/HZ, (int __user *)oldval) ||
2206 (oldlenp && put_user(sizeof(int),oldlenp)))
2207 return -EFAULT;
2208 }
2209 if (newval && newlen) {
2210 int new;
2211 if (newlen != sizeof(int))
2212 return -EINVAL;
2213 if (get_user(new, (int __user *)newval))
2214 return -EFAULT;
2215 *(int *)(table->data) = new*HZ;
2216 }
2217 return 1;
2218 }
2219
2220 /* Strategy function to convert jiffies to seconds */
2221 int sysctl_ms_jiffies(ctl_table *table, int __user *name, int nlen,
2222 void __user *oldval, size_t __user *oldlenp,
2223 void __user *newval, size_t newlen, void **context)
2224 {
2225 if (oldval) {
2226 size_t olen;
2227 if (oldlenp) {
2228 if (get_user(olen, oldlenp))
2229 return -EFAULT;
2230 if (olen!=sizeof(int))
2231 return -EINVAL;
2232 }
2233 if (put_user(jiffies_to_msecs(*(int *)(table->data)), (int __user *)oldval) ||
2234 (oldlenp && put_user(sizeof(int),oldlenp)))
2235 return -EFAULT;
2236 }
2237 if (newval && newlen) {
2238 int new;
2239 if (newlen != sizeof(int))
2240 return -EINVAL;
2241 if (get_user(new, (int __user *)newval))
2242 return -EFAULT;
2243 *(int *)(table->data) = msecs_to_jiffies(new);
2244 }
2245 return 1;
2246 }
2247
2248 #else /* CONFIG_SYSCTL */
2249
2250
2251 asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
2252 {
2253 return -ENOSYS;
2254 }
2255
2256 int sysctl_string(ctl_table *table, int __user *name, int nlen,
2257 void __user *oldval, size_t __user *oldlenp,
2258 void __user *newval, size_t newlen, void **context)
2259 {
2260 return -ENOSYS;
2261 }
2262
2263 int sysctl_intvec(ctl_table *table, int __user *name, int nlen,
2264 void __user *oldval, size_t __user *oldlenp,
2265 void __user *newval, size_t newlen, void **context)
2266 {
2267 return -ENOSYS;
2268 }
2269
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 return -ENOSYS;
2275 }
2276
2277 int sysctl_ms_jiffies(ctl_table *table, int __user *name, int nlen,
2278 void __user *oldval, size_t __user *oldlenp,
2279 void __user *newval, size_t newlen, void **context)
2280 {
2281 return -ENOSYS;
2282 }
2283
2284 int proc_dostring(ctl_table *table, int write, struct file *filp,
2285 void __user *buffer, size_t *lenp, loff_t *ppos)
2286 {
2287 return -ENOSYS;
2288 }
2289
2290 int proc_dointvec(ctl_table *table, int write, struct file *filp,
2291 void __user *buffer, size_t *lenp, loff_t *ppos)
2292 {
2293 return -ENOSYS;
2294 }
2295
2296 int proc_dointvec_bset(ctl_table *table, int write, struct file *filp,
2297 void __user *buffer, size_t *lenp, loff_t *ppos)
2298 {
2299 return -ENOSYS;
2300 }
2301
2302 int proc_dointvec_minmax(ctl_table *table, int write, struct file *filp,
2303 void __user *buffer, size_t *lenp, loff_t *ppos)
2304 {
2305 return -ENOSYS;
2306 }
2307
2308 int proc_dointvec_jiffies(ctl_table *table, int write, struct file *filp,
2309 void __user *buffer, size_t *lenp, loff_t *ppos)
2310 {
2311 return -ENOSYS;
2312 }
2313
2314 int proc_dointvec_userhz_jiffies(ctl_table *table, int write, struct file *filp,
2315 void __user *buffer, size_t *lenp, loff_t *ppos)
2316 {
2317 return -ENOSYS;
2318 }
2319
2320 int proc_dointvec_ms_jiffies(ctl_table *table, int write, struct file *filp,
2321 void __user *buffer, size_t *lenp, loff_t *ppos)
2322 {
2323 return -ENOSYS;
2324 }
2325
2326 int proc_doulongvec_minmax(ctl_table *table, int write, struct file *filp,
2327 void __user *buffer, size_t *lenp, loff_t *ppos)
2328 {
2329 return -ENOSYS;
2330 }
2331
2332 int proc_doulongvec_ms_jiffies_minmax(ctl_table *table, int write,
2333 struct file *filp,
2334 void __user *buffer,
2335 size_t *lenp, loff_t *ppos)
2336 {
2337 return -ENOSYS;
2338 }
2339
2340 struct ctl_table_header * register_sysctl_table(ctl_table * table,
2341 int insert_at_head)
2342 {
2343 return NULL;
2344 }
2345
2346 void unregister_sysctl_table(struct ctl_table_header * table)
2347 {
2348 }
2349
2350 #endif /* CONFIG_SYSCTL */
2351
2352 /*
2353 * No sense putting this after each symbol definition, twice,
2354 * exception granted :-)
2355 */
2356 EXPORT_SYMBOL(proc_dointvec);
2357 EXPORT_SYMBOL(proc_dointvec_jiffies);
2358 EXPORT_SYMBOL(proc_dointvec_minmax);
2359 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2360 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2361 EXPORT_SYMBOL(proc_dostring);
2362 EXPORT_SYMBOL(proc_doulongvec_minmax);
2363 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
2364 EXPORT_SYMBOL(register_sysctl_table);
2365 EXPORT_SYMBOL(sysctl_intvec);
2366 EXPORT_SYMBOL(sysctl_jiffies);
2367 EXPORT_SYMBOL(sysctl_ms_jiffies);
2368 EXPORT_SYMBOL(sysctl_string);
2369 EXPORT_SYMBOL(unregister_sysctl_table);
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