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1da177e4 LT |
1 | /* |
2 | * sysctl.c: General linux system control interface | |
3 | * | |
4 | * Begun 24 March 1995, Stephen Tweedie | |
5 | * Added /proc support, Dec 1995 | |
6 | * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas. | |
7 | * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver. | |
8 | * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver. | |
9 | * Dynamic registration fixes, Stephen Tweedie. | |
10 | * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn. | |
11 | * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris | |
12 | * Horn. | |
13 | * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer. | |
14 | * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer. | |
15 | * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill | |
16 | * Wendling. | |
17 | * The list_for_each() macro wasn't appropriate for the sysctl loop. | |
18 | * Removed it and replaced it with older style, 03/23/00, Bill Wendling | |
19 | */ | |
20 | ||
1da177e4 LT |
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> | |
c59ede7b | 27 | #include <linux/capability.h> |
1da177e4 LT |
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> | |
0296b228 | 34 | #include <linux/kobject.h> |
20380731 | 35 | #include <linux/net.h> |
1da177e4 LT |
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> | |
c255d844 PM |
46 | #include <linux/nfs_fs.h> |
47 | #include <linux/acpi.h> | |
1da177e4 LT |
48 | |
49 | #include <asm/uaccess.h> | |
50 | #include <asm/processor.h> | |
51 | ||
529bf6be DS |
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 | ||
29cbc78b AK |
55 | #ifdef CONFIG_X86 |
56 | #include <asm/nmi.h> | |
0741f4d2 | 57 | #include <asm/stacktrace.h> |
29cbc78b AK |
58 | #endif |
59 | ||
1da177e4 LT |
60 | #if defined(CONFIG_SYSCTL) |
61 | ||
62 | /* External variables not in a header file. */ | |
63 | extern int C_A_D; | |
64 | extern int sysctl_overcommit_memory; | |
65 | extern int sysctl_overcommit_ratio; | |
fadd8fbd | 66 | extern int sysctl_panic_on_oom; |
1da177e4 | 67 | extern int max_threads; |
1da177e4 | 68 | extern int core_uses_pid; |
d6e71144 | 69 | extern int suid_dumpable; |
1da177e4 | 70 | extern char core_pattern[]; |
1da177e4 LT |
71 | extern int pid_max; |
72 | extern int min_free_kbytes; | |
73 | extern int printk_ratelimit_jiffies; | |
74 | extern int printk_ratelimit_burst; | |
75 | extern int pid_max_min, pid_max_max; | |
9d0243bc | 76 | extern int sysctl_drop_caches; |
8ad4b1fb | 77 | extern int percpu_pagelist_fraction; |
bebfa101 | 78 | extern int compat_log; |
5096add8 | 79 | extern int maps_protect; |
1da177e4 | 80 | |
1da177e4 LT |
81 | /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */ |
82 | static int maxolduid = 65535; | |
83 | static int minolduid; | |
8ad4b1fb | 84 | static int min_percpu_pagelist_fract = 8; |
1da177e4 LT |
85 | |
86 | static int ngroups_max = NGROUPS_MAX; | |
87 | ||
88 | #ifdef CONFIG_KMOD | |
89 | extern char modprobe_path[]; | |
90 | #endif | |
1da177e4 LT |
91 | #ifdef CONFIG_CHR_DEV_SG |
92 | extern int sg_big_buff; | |
93 | #endif | |
1da177e4 LT |
94 | |
95 | #ifdef __sparc__ | |
96 | extern char reboot_command []; | |
97 | extern int stop_a_enabled; | |
98 | extern int scons_pwroff; | |
99 | #endif | |
100 | ||
101 | #ifdef __hppa__ | |
102 | extern int pwrsw_enabled; | |
103 | extern int unaligned_enabled; | |
104 | #endif | |
105 | ||
347a8dc3 | 106 | #ifdef CONFIG_S390 |
1da177e4 LT |
107 | #ifdef CONFIG_MATHEMU |
108 | extern int sysctl_ieee_emulation_warnings; | |
109 | #endif | |
110 | extern int sysctl_userprocess_debug; | |
951f22d5 | 111 | extern int spin_retry; |
1da177e4 LT |
112 | #endif |
113 | ||
114 | extern int sysctl_hz_timer; | |
115 | ||
116 | #ifdef CONFIG_BSD_PROCESS_ACCT | |
117 | extern int acct_parm[]; | |
118 | #endif | |
119 | ||
d2b176ed JS |
120 | #ifdef CONFIG_IA64 |
121 | extern int no_unaligned_warning; | |
122 | #endif | |
123 | ||
23f78d4a IM |
124 | #ifdef CONFIG_RT_MUTEXES |
125 | extern int max_lock_depth; | |
126 | #endif | |
127 | ||
b89a8171 EB |
128 | #ifdef CONFIG_SYSCTL_SYSCALL |
129 | static int parse_table(int __user *, int, void __user *, size_t __user *, | |
1f29bcd7 | 130 | void __user *, size_t, ctl_table *); |
b89a8171 EB |
131 | #endif |
132 | ||
6b49a257 | 133 | |
d6f8ff73 | 134 | #ifdef CONFIG_PROC_SYSCTL |
9ec52099 CLG |
135 | static int proc_do_cad_pid(ctl_table *table, int write, struct file *filp, |
136 | void __user *buffer, size_t *lenp, loff_t *ppos); | |
34f5a398 TT |
137 | static int proc_dointvec_taint(ctl_table *table, int write, struct file *filp, |
138 | void __user *buffer, size_t *lenp, loff_t *ppos); | |
d6f8ff73 | 139 | #endif |
9ec52099 | 140 | |
1da177e4 LT |
141 | static ctl_table root_table[]; |
142 | static struct ctl_table_header root_table_header = | |
143 | { root_table, LIST_HEAD_INIT(root_table_header.ctl_entry) }; | |
144 | ||
145 | static ctl_table kern_table[]; | |
146 | static ctl_table vm_table[]; | |
1da177e4 LT |
147 | static ctl_table fs_table[]; |
148 | static ctl_table debug_table[]; | |
149 | static ctl_table dev_table[]; | |
150 | extern ctl_table random_table[]; | |
151 | #ifdef CONFIG_UNIX98_PTYS | |
152 | extern ctl_table pty_table[]; | |
153 | #endif | |
2d9048e2 | 154 | #ifdef CONFIG_INOTIFY_USER |
0399cb08 RL |
155 | extern ctl_table inotify_table[]; |
156 | #endif | |
1da177e4 LT |
157 | |
158 | #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT | |
159 | int sysctl_legacy_va_layout; | |
160 | #endif | |
161 | ||
9bc9a6bd | 162 | |
1da177e4 LT |
163 | /* The default sysctl tables: */ |
164 | ||
165 | static ctl_table root_table[] = { | |
166 | { | |
167 | .ctl_name = CTL_KERN, | |
168 | .procname = "kernel", | |
169 | .mode = 0555, | |
170 | .child = kern_table, | |
171 | }, | |
172 | { | |
173 | .ctl_name = CTL_VM, | |
174 | .procname = "vm", | |
175 | .mode = 0555, | |
176 | .child = vm_table, | |
177 | }, | |
178 | #ifdef CONFIG_NET | |
179 | { | |
180 | .ctl_name = CTL_NET, | |
181 | .procname = "net", | |
182 | .mode = 0555, | |
183 | .child = net_table, | |
184 | }, | |
185 | #endif | |
1da177e4 LT |
186 | { |
187 | .ctl_name = CTL_FS, | |
188 | .procname = "fs", | |
189 | .mode = 0555, | |
190 | .child = fs_table, | |
191 | }, | |
192 | { | |
193 | .ctl_name = CTL_DEBUG, | |
194 | .procname = "debug", | |
195 | .mode = 0555, | |
196 | .child = debug_table, | |
197 | }, | |
198 | { | |
199 | .ctl_name = CTL_DEV, | |
200 | .procname = "dev", | |
201 | .mode = 0555, | |
202 | .child = dev_table, | |
203 | }, | |
0eeca283 | 204 | |
1da177e4 LT |
205 | { .ctl_name = 0 } |
206 | }; | |
207 | ||
208 | static ctl_table kern_table[] = { | |
1da177e4 LT |
209 | { |
210 | .ctl_name = KERN_PANIC, | |
211 | .procname = "panic", | |
212 | .data = &panic_timeout, | |
213 | .maxlen = sizeof(int), | |
214 | .mode = 0644, | |
215 | .proc_handler = &proc_dointvec, | |
216 | }, | |
217 | { | |
218 | .ctl_name = KERN_CORE_USES_PID, | |
219 | .procname = "core_uses_pid", | |
220 | .data = &core_uses_pid, | |
221 | .maxlen = sizeof(int), | |
222 | .mode = 0644, | |
223 | .proc_handler = &proc_dointvec, | |
224 | }, | |
225 | { | |
226 | .ctl_name = KERN_CORE_PATTERN, | |
227 | .procname = "core_pattern", | |
228 | .data = core_pattern, | |
d025c9db | 229 | .maxlen = 128, |
1da177e4 LT |
230 | .mode = 0644, |
231 | .proc_handler = &proc_dostring, | |
232 | .strategy = &sysctl_string, | |
233 | }, | |
34f5a398 | 234 | #ifdef CONFIG_PROC_SYSCTL |
1da177e4 LT |
235 | { |
236 | .ctl_name = KERN_TAINTED, | |
237 | .procname = "tainted", | |
238 | .data = &tainted, | |
239 | .maxlen = sizeof(int), | |
34f5a398 TT |
240 | .mode = 0644, |
241 | .proc_handler = &proc_dointvec_taint, | |
1da177e4 | 242 | }, |
34f5a398 | 243 | #endif |
1da177e4 LT |
244 | { |
245 | .ctl_name = KERN_CAP_BSET, | |
246 | .procname = "cap-bound", | |
247 | .data = &cap_bset, | |
248 | .maxlen = sizeof(kernel_cap_t), | |
249 | .mode = 0600, | |
250 | .proc_handler = &proc_dointvec_bset, | |
251 | }, | |
252 | #ifdef CONFIG_BLK_DEV_INITRD | |
253 | { | |
254 | .ctl_name = KERN_REALROOTDEV, | |
255 | .procname = "real-root-dev", | |
256 | .data = &real_root_dev, | |
257 | .maxlen = sizeof(int), | |
258 | .mode = 0644, | |
259 | .proc_handler = &proc_dointvec, | |
260 | }, | |
261 | #endif | |
262 | #ifdef __sparc__ | |
263 | { | |
264 | .ctl_name = KERN_SPARC_REBOOT, | |
265 | .procname = "reboot-cmd", | |
266 | .data = reboot_command, | |
267 | .maxlen = 256, | |
268 | .mode = 0644, | |
269 | .proc_handler = &proc_dostring, | |
270 | .strategy = &sysctl_string, | |
271 | }, | |
272 | { | |
273 | .ctl_name = KERN_SPARC_STOP_A, | |
274 | .procname = "stop-a", | |
275 | .data = &stop_a_enabled, | |
276 | .maxlen = sizeof (int), | |
277 | .mode = 0644, | |
278 | .proc_handler = &proc_dointvec, | |
279 | }, | |
280 | { | |
281 | .ctl_name = KERN_SPARC_SCONS_PWROFF, | |
282 | .procname = "scons-poweroff", | |
283 | .data = &scons_pwroff, | |
284 | .maxlen = sizeof (int), | |
285 | .mode = 0644, | |
286 | .proc_handler = &proc_dointvec, | |
287 | }, | |
288 | #endif | |
289 | #ifdef __hppa__ | |
290 | { | |
291 | .ctl_name = KERN_HPPA_PWRSW, | |
292 | .procname = "soft-power", | |
293 | .data = &pwrsw_enabled, | |
294 | .maxlen = sizeof (int), | |
295 | .mode = 0644, | |
296 | .proc_handler = &proc_dointvec, | |
297 | }, | |
298 | { | |
299 | .ctl_name = KERN_HPPA_UNALIGNED, | |
300 | .procname = "unaligned-trap", | |
301 | .data = &unaligned_enabled, | |
302 | .maxlen = sizeof (int), | |
303 | .mode = 0644, | |
304 | .proc_handler = &proc_dointvec, | |
305 | }, | |
306 | #endif | |
307 | { | |
308 | .ctl_name = KERN_CTLALTDEL, | |
309 | .procname = "ctrl-alt-del", | |
310 | .data = &C_A_D, | |
311 | .maxlen = sizeof(int), | |
312 | .mode = 0644, | |
313 | .proc_handler = &proc_dointvec, | |
314 | }, | |
315 | { | |
316 | .ctl_name = KERN_PRINTK, | |
317 | .procname = "printk", | |
318 | .data = &console_loglevel, | |
319 | .maxlen = 4*sizeof(int), | |
320 | .mode = 0644, | |
321 | .proc_handler = &proc_dointvec, | |
322 | }, | |
323 | #ifdef CONFIG_KMOD | |
324 | { | |
325 | .ctl_name = KERN_MODPROBE, | |
326 | .procname = "modprobe", | |
327 | .data = &modprobe_path, | |
328 | .maxlen = KMOD_PATH_LEN, | |
329 | .mode = 0644, | |
330 | .proc_handler = &proc_dostring, | |
331 | .strategy = &sysctl_string, | |
332 | }, | |
333 | #endif | |
57ae2508 | 334 | #if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET) |
1da177e4 LT |
335 | { |
336 | .ctl_name = KERN_HOTPLUG, | |
337 | .procname = "hotplug", | |
312c004d KS |
338 | .data = &uevent_helper, |
339 | .maxlen = UEVENT_HELPER_PATH_LEN, | |
1da177e4 LT |
340 | .mode = 0644, |
341 | .proc_handler = &proc_dostring, | |
342 | .strategy = &sysctl_string, | |
343 | }, | |
344 | #endif | |
345 | #ifdef CONFIG_CHR_DEV_SG | |
346 | { | |
347 | .ctl_name = KERN_SG_BIG_BUFF, | |
348 | .procname = "sg-big-buff", | |
349 | .data = &sg_big_buff, | |
350 | .maxlen = sizeof (int), | |
351 | .mode = 0444, | |
352 | .proc_handler = &proc_dointvec, | |
353 | }, | |
354 | #endif | |
355 | #ifdef CONFIG_BSD_PROCESS_ACCT | |
356 | { | |
357 | .ctl_name = KERN_ACCT, | |
358 | .procname = "acct", | |
359 | .data = &acct_parm, | |
360 | .maxlen = 3*sizeof(int), | |
361 | .mode = 0644, | |
362 | .proc_handler = &proc_dointvec, | |
363 | }, | |
364 | #endif | |
1da177e4 LT |
365 | #ifdef CONFIG_MAGIC_SYSRQ |
366 | { | |
367 | .ctl_name = KERN_SYSRQ, | |
368 | .procname = "sysrq", | |
5d6f647f | 369 | .data = &__sysrq_enabled, |
1da177e4 LT |
370 | .maxlen = sizeof (int), |
371 | .mode = 0644, | |
372 | .proc_handler = &proc_dointvec, | |
373 | }, | |
374 | #endif | |
d6f8ff73 | 375 | #ifdef CONFIG_PROC_SYSCTL |
1da177e4 LT |
376 | { |
377 | .ctl_name = KERN_CADPID, | |
378 | .procname = "cad_pid", | |
9ec52099 | 379 | .data = NULL, |
1da177e4 LT |
380 | .maxlen = sizeof (int), |
381 | .mode = 0600, | |
9ec52099 | 382 | .proc_handler = &proc_do_cad_pid, |
1da177e4 | 383 | }, |
d6f8ff73 | 384 | #endif |
1da177e4 LT |
385 | { |
386 | .ctl_name = KERN_MAX_THREADS, | |
387 | .procname = "threads-max", | |
388 | .data = &max_threads, | |
389 | .maxlen = sizeof(int), | |
390 | .mode = 0644, | |
391 | .proc_handler = &proc_dointvec, | |
392 | }, | |
393 | { | |
394 | .ctl_name = KERN_RANDOM, | |
395 | .procname = "random", | |
396 | .mode = 0555, | |
397 | .child = random_table, | |
398 | }, | |
399 | #ifdef CONFIG_UNIX98_PTYS | |
400 | { | |
401 | .ctl_name = KERN_PTY, | |
402 | .procname = "pty", | |
403 | .mode = 0555, | |
404 | .child = pty_table, | |
405 | }, | |
406 | #endif | |
407 | { | |
408 | .ctl_name = KERN_OVERFLOWUID, | |
409 | .procname = "overflowuid", | |
410 | .data = &overflowuid, | |
411 | .maxlen = sizeof(int), | |
412 | .mode = 0644, | |
413 | .proc_handler = &proc_dointvec_minmax, | |
414 | .strategy = &sysctl_intvec, | |
415 | .extra1 = &minolduid, | |
416 | .extra2 = &maxolduid, | |
417 | }, | |
418 | { | |
419 | .ctl_name = KERN_OVERFLOWGID, | |
420 | .procname = "overflowgid", | |
421 | .data = &overflowgid, | |
422 | .maxlen = sizeof(int), | |
423 | .mode = 0644, | |
424 | .proc_handler = &proc_dointvec_minmax, | |
425 | .strategy = &sysctl_intvec, | |
426 | .extra1 = &minolduid, | |
427 | .extra2 = &maxolduid, | |
428 | }, | |
347a8dc3 | 429 | #ifdef CONFIG_S390 |
1da177e4 LT |
430 | #ifdef CONFIG_MATHEMU |
431 | { | |
432 | .ctl_name = KERN_IEEE_EMULATION_WARNINGS, | |
433 | .procname = "ieee_emulation_warnings", | |
434 | .data = &sysctl_ieee_emulation_warnings, | |
435 | .maxlen = sizeof(int), | |
436 | .mode = 0644, | |
437 | .proc_handler = &proc_dointvec, | |
438 | }, | |
439 | #endif | |
440 | #ifdef CONFIG_NO_IDLE_HZ | |
441 | { | |
442 | .ctl_name = KERN_HZ_TIMER, | |
443 | .procname = "hz_timer", | |
444 | .data = &sysctl_hz_timer, | |
445 | .maxlen = sizeof(int), | |
446 | .mode = 0644, | |
447 | .proc_handler = &proc_dointvec, | |
448 | }, | |
449 | #endif | |
450 | { | |
451 | .ctl_name = KERN_S390_USER_DEBUG_LOGGING, | |
452 | .procname = "userprocess_debug", | |
453 | .data = &sysctl_userprocess_debug, | |
454 | .maxlen = sizeof(int), | |
455 | .mode = 0644, | |
456 | .proc_handler = &proc_dointvec, | |
457 | }, | |
458 | #endif | |
459 | { | |
460 | .ctl_name = KERN_PIDMAX, | |
461 | .procname = "pid_max", | |
462 | .data = &pid_max, | |
463 | .maxlen = sizeof (int), | |
464 | .mode = 0644, | |
465 | .proc_handler = &proc_dointvec_minmax, | |
466 | .strategy = sysctl_intvec, | |
467 | .extra1 = &pid_max_min, | |
468 | .extra2 = &pid_max_max, | |
469 | }, | |
470 | { | |
471 | .ctl_name = KERN_PANIC_ON_OOPS, | |
472 | .procname = "panic_on_oops", | |
473 | .data = &panic_on_oops, | |
474 | .maxlen = sizeof(int), | |
475 | .mode = 0644, | |
476 | .proc_handler = &proc_dointvec, | |
477 | }, | |
478 | { | |
479 | .ctl_name = KERN_PRINTK_RATELIMIT, | |
480 | .procname = "printk_ratelimit", | |
481 | .data = &printk_ratelimit_jiffies, | |
482 | .maxlen = sizeof(int), | |
483 | .mode = 0644, | |
484 | .proc_handler = &proc_dointvec_jiffies, | |
485 | .strategy = &sysctl_jiffies, | |
486 | }, | |
487 | { | |
488 | .ctl_name = KERN_PRINTK_RATELIMIT_BURST, | |
489 | .procname = "printk_ratelimit_burst", | |
490 | .data = &printk_ratelimit_burst, | |
491 | .maxlen = sizeof(int), | |
492 | .mode = 0644, | |
493 | .proc_handler = &proc_dointvec, | |
494 | }, | |
495 | { | |
496 | .ctl_name = KERN_NGROUPS_MAX, | |
497 | .procname = "ngroups_max", | |
498 | .data = &ngroups_max, | |
499 | .maxlen = sizeof (int), | |
500 | .mode = 0444, | |
501 | .proc_handler = &proc_dointvec, | |
502 | }, | |
503 | #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86) | |
504 | { | |
505 | .ctl_name = KERN_UNKNOWN_NMI_PANIC, | |
506 | .procname = "unknown_nmi_panic", | |
507 | .data = &unknown_nmi_panic, | |
508 | .maxlen = sizeof (int), | |
509 | .mode = 0644, | |
2fbe7b25 | 510 | .proc_handler = &proc_dointvec, |
1da177e4 | 511 | }, |
407984f1 DZ |
512 | { |
513 | .ctl_name = KERN_NMI_WATCHDOG, | |
514 | .procname = "nmi_watchdog", | |
515 | .data = &nmi_watchdog_enabled, | |
516 | .maxlen = sizeof (int), | |
517 | .mode = 0644, | |
518 | .proc_handler = &proc_nmi_enabled, | |
1da177e4 LT |
519 | }, |
520 | #endif | |
521 | #if defined(CONFIG_X86) | |
8da5adda DZ |
522 | { |
523 | .ctl_name = KERN_PANIC_ON_NMI, | |
524 | .procname = "panic_on_unrecovered_nmi", | |
525 | .data = &panic_on_unrecovered_nmi, | |
526 | .maxlen = sizeof(int), | |
527 | .mode = 0644, | |
528 | .proc_handler = &proc_dointvec, | |
529 | }, | |
1da177e4 LT |
530 | { |
531 | .ctl_name = KERN_BOOTLOADER_TYPE, | |
532 | .procname = "bootloader_type", | |
533 | .data = &bootloader_type, | |
534 | .maxlen = sizeof (int), | |
535 | .mode = 0444, | |
536 | .proc_handler = &proc_dointvec, | |
537 | }, | |
0741f4d2 CE |
538 | { |
539 | .ctl_name = CTL_UNNUMBERED, | |
540 | .procname = "kstack_depth_to_print", | |
541 | .data = &kstack_depth_to_print, | |
542 | .maxlen = sizeof(int), | |
543 | .mode = 0644, | |
544 | .proc_handler = &proc_dointvec, | |
545 | }, | |
1da177e4 | 546 | #endif |
7a9166e3 | 547 | #if defined(CONFIG_MMU) |
1da177e4 LT |
548 | { |
549 | .ctl_name = KERN_RANDOMIZE, | |
550 | .procname = "randomize_va_space", | |
551 | .data = &randomize_va_space, | |
552 | .maxlen = sizeof(int), | |
553 | .mode = 0644, | |
554 | .proc_handler = &proc_dointvec, | |
555 | }, | |
7a9166e3 | 556 | #endif |
0152fb37 | 557 | #if defined(CONFIG_S390) && defined(CONFIG_SMP) |
951f22d5 MS |
558 | { |
559 | .ctl_name = KERN_SPIN_RETRY, | |
560 | .procname = "spin_retry", | |
561 | .data = &spin_retry, | |
562 | .maxlen = sizeof (int), | |
563 | .mode = 0644, | |
564 | .proc_handler = &proc_dointvec, | |
565 | }, | |
c255d844 PM |
566 | #endif |
567 | #ifdef CONFIG_ACPI_SLEEP | |
568 | { | |
569 | .ctl_name = KERN_ACPI_VIDEO_FLAGS, | |
570 | .procname = "acpi_video_flags", | |
571 | .data = &acpi_video_flags, | |
572 | .maxlen = sizeof (unsigned long), | |
573 | .mode = 0644, | |
7f99f06f | 574 | .proc_handler = &proc_doulongvec_minmax, |
c255d844 | 575 | }, |
d2b176ed JS |
576 | #endif |
577 | #ifdef CONFIG_IA64 | |
578 | { | |
579 | .ctl_name = KERN_IA64_UNALIGNED, | |
580 | .procname = "ignore-unaligned-usertrap", | |
581 | .data = &no_unaligned_warning, | |
582 | .maxlen = sizeof (int), | |
583 | .mode = 0644, | |
584 | .proc_handler = &proc_dointvec, | |
585 | }, | |
bebfa101 AK |
586 | #endif |
587 | #ifdef CONFIG_COMPAT | |
588 | { | |
589 | .ctl_name = KERN_COMPAT_LOG, | |
590 | .procname = "compat-log", | |
591 | .data = &compat_log, | |
592 | .maxlen = sizeof (int), | |
593 | .mode = 0644, | |
594 | .proc_handler = &proc_dointvec, | |
595 | }, | |
951f22d5 | 596 | #endif |
23f78d4a IM |
597 | #ifdef CONFIG_RT_MUTEXES |
598 | { | |
599 | .ctl_name = KERN_MAX_LOCK_DEPTH, | |
600 | .procname = "max_lock_depth", | |
601 | .data = &max_lock_depth, | |
602 | .maxlen = sizeof(int), | |
603 | .mode = 0644, | |
604 | .proc_handler = &proc_dointvec, | |
605 | }, | |
606 | #endif | |
5096add8 KC |
607 | #ifdef CONFIG_PROC_FS |
608 | { | |
609 | .ctl_name = CTL_UNNUMBERED, | |
610 | .procname = "maps_protect", | |
611 | .data = &maps_protect, | |
612 | .maxlen = sizeof(int), | |
613 | .mode = 0644, | |
614 | .proc_handler = &proc_dointvec, | |
615 | }, | |
616 | #endif | |
23f78d4a | 617 | |
1da177e4 LT |
618 | { .ctl_name = 0 } |
619 | }; | |
620 | ||
621 | /* Constants for minimum and maximum testing in vm_table. | |
622 | We use these as one-element integer vectors. */ | |
623 | static int zero; | |
624 | static int one_hundred = 100; | |
625 | ||
626 | ||
627 | static ctl_table vm_table[] = { | |
628 | { | |
629 | .ctl_name = VM_OVERCOMMIT_MEMORY, | |
630 | .procname = "overcommit_memory", | |
631 | .data = &sysctl_overcommit_memory, | |
632 | .maxlen = sizeof(sysctl_overcommit_memory), | |
633 | .mode = 0644, | |
634 | .proc_handler = &proc_dointvec, | |
635 | }, | |
fadd8fbd KH |
636 | { |
637 | .ctl_name = VM_PANIC_ON_OOM, | |
638 | .procname = "panic_on_oom", | |
639 | .data = &sysctl_panic_on_oom, | |
640 | .maxlen = sizeof(sysctl_panic_on_oom), | |
641 | .mode = 0644, | |
642 | .proc_handler = &proc_dointvec, | |
643 | }, | |
1da177e4 LT |
644 | { |
645 | .ctl_name = VM_OVERCOMMIT_RATIO, | |
646 | .procname = "overcommit_ratio", | |
647 | .data = &sysctl_overcommit_ratio, | |
648 | .maxlen = sizeof(sysctl_overcommit_ratio), | |
649 | .mode = 0644, | |
650 | .proc_handler = &proc_dointvec, | |
651 | }, | |
652 | { | |
653 | .ctl_name = VM_PAGE_CLUSTER, | |
654 | .procname = "page-cluster", | |
655 | .data = &page_cluster, | |
656 | .maxlen = sizeof(int), | |
657 | .mode = 0644, | |
658 | .proc_handler = &proc_dointvec, | |
659 | }, | |
660 | { | |
661 | .ctl_name = VM_DIRTY_BACKGROUND, | |
662 | .procname = "dirty_background_ratio", | |
663 | .data = &dirty_background_ratio, | |
664 | .maxlen = sizeof(dirty_background_ratio), | |
665 | .mode = 0644, | |
666 | .proc_handler = &proc_dointvec_minmax, | |
667 | .strategy = &sysctl_intvec, | |
668 | .extra1 = &zero, | |
669 | .extra2 = &one_hundred, | |
670 | }, | |
671 | { | |
672 | .ctl_name = VM_DIRTY_RATIO, | |
673 | .procname = "dirty_ratio", | |
674 | .data = &vm_dirty_ratio, | |
675 | .maxlen = sizeof(vm_dirty_ratio), | |
676 | .mode = 0644, | |
677 | .proc_handler = &proc_dointvec_minmax, | |
678 | .strategy = &sysctl_intvec, | |
679 | .extra1 = &zero, | |
680 | .extra2 = &one_hundred, | |
681 | }, | |
682 | { | |
683 | .ctl_name = VM_DIRTY_WB_CS, | |
684 | .procname = "dirty_writeback_centisecs", | |
f6ef9438 BS |
685 | .data = &dirty_writeback_interval, |
686 | .maxlen = sizeof(dirty_writeback_interval), | |
1da177e4 LT |
687 | .mode = 0644, |
688 | .proc_handler = &dirty_writeback_centisecs_handler, | |
689 | }, | |
690 | { | |
691 | .ctl_name = VM_DIRTY_EXPIRE_CS, | |
692 | .procname = "dirty_expire_centisecs", | |
f6ef9438 BS |
693 | .data = &dirty_expire_interval, |
694 | .maxlen = sizeof(dirty_expire_interval), | |
1da177e4 | 695 | .mode = 0644, |
f6ef9438 | 696 | .proc_handler = &proc_dointvec_userhz_jiffies, |
1da177e4 LT |
697 | }, |
698 | { | |
699 | .ctl_name = VM_NR_PDFLUSH_THREADS, | |
700 | .procname = "nr_pdflush_threads", | |
701 | .data = &nr_pdflush_threads, | |
702 | .maxlen = sizeof nr_pdflush_threads, | |
703 | .mode = 0444 /* read-only*/, | |
704 | .proc_handler = &proc_dointvec, | |
705 | }, | |
706 | { | |
707 | .ctl_name = VM_SWAPPINESS, | |
708 | .procname = "swappiness", | |
709 | .data = &vm_swappiness, | |
710 | .maxlen = sizeof(vm_swappiness), | |
711 | .mode = 0644, | |
712 | .proc_handler = &proc_dointvec_minmax, | |
713 | .strategy = &sysctl_intvec, | |
714 | .extra1 = &zero, | |
715 | .extra2 = &one_hundred, | |
716 | }, | |
717 | #ifdef CONFIG_HUGETLB_PAGE | |
718 | { | |
719 | .ctl_name = VM_HUGETLB_PAGES, | |
720 | .procname = "nr_hugepages", | |
721 | .data = &max_huge_pages, | |
722 | .maxlen = sizeof(unsigned long), | |
723 | .mode = 0644, | |
724 | .proc_handler = &hugetlb_sysctl_handler, | |
725 | .extra1 = (void *)&hugetlb_zero, | |
726 | .extra2 = (void *)&hugetlb_infinity, | |
727 | }, | |
728 | { | |
729 | .ctl_name = VM_HUGETLB_GROUP, | |
730 | .procname = "hugetlb_shm_group", | |
731 | .data = &sysctl_hugetlb_shm_group, | |
732 | .maxlen = sizeof(gid_t), | |
733 | .mode = 0644, | |
734 | .proc_handler = &proc_dointvec, | |
735 | }, | |
736 | #endif | |
737 | { | |
738 | .ctl_name = VM_LOWMEM_RESERVE_RATIO, | |
739 | .procname = "lowmem_reserve_ratio", | |
740 | .data = &sysctl_lowmem_reserve_ratio, | |
741 | .maxlen = sizeof(sysctl_lowmem_reserve_ratio), | |
742 | .mode = 0644, | |
743 | .proc_handler = &lowmem_reserve_ratio_sysctl_handler, | |
744 | .strategy = &sysctl_intvec, | |
745 | }, | |
9d0243bc AM |
746 | { |
747 | .ctl_name = VM_DROP_PAGECACHE, | |
748 | .procname = "drop_caches", | |
749 | .data = &sysctl_drop_caches, | |
750 | .maxlen = sizeof(int), | |
751 | .mode = 0644, | |
752 | .proc_handler = drop_caches_sysctl_handler, | |
753 | .strategy = &sysctl_intvec, | |
754 | }, | |
1da177e4 LT |
755 | { |
756 | .ctl_name = VM_MIN_FREE_KBYTES, | |
757 | .procname = "min_free_kbytes", | |
758 | .data = &min_free_kbytes, | |
759 | .maxlen = sizeof(min_free_kbytes), | |
760 | .mode = 0644, | |
761 | .proc_handler = &min_free_kbytes_sysctl_handler, | |
762 | .strategy = &sysctl_intvec, | |
763 | .extra1 = &zero, | |
764 | }, | |
8ad4b1fb RS |
765 | { |
766 | .ctl_name = VM_PERCPU_PAGELIST_FRACTION, | |
767 | .procname = "percpu_pagelist_fraction", | |
768 | .data = &percpu_pagelist_fraction, | |
769 | .maxlen = sizeof(percpu_pagelist_fraction), | |
770 | .mode = 0644, | |
771 | .proc_handler = &percpu_pagelist_fraction_sysctl_handler, | |
772 | .strategy = &sysctl_intvec, | |
773 | .extra1 = &min_percpu_pagelist_fract, | |
774 | }, | |
1da177e4 LT |
775 | #ifdef CONFIG_MMU |
776 | { | |
777 | .ctl_name = VM_MAX_MAP_COUNT, | |
778 | .procname = "max_map_count", | |
779 | .data = &sysctl_max_map_count, | |
780 | .maxlen = sizeof(sysctl_max_map_count), | |
781 | .mode = 0644, | |
782 | .proc_handler = &proc_dointvec | |
783 | }, | |
784 | #endif | |
785 | { | |
786 | .ctl_name = VM_LAPTOP_MODE, | |
787 | .procname = "laptop_mode", | |
788 | .data = &laptop_mode, | |
789 | .maxlen = sizeof(laptop_mode), | |
790 | .mode = 0644, | |
ed5b43f1 BS |
791 | .proc_handler = &proc_dointvec_jiffies, |
792 | .strategy = &sysctl_jiffies, | |
1da177e4 LT |
793 | }, |
794 | { | |
795 | .ctl_name = VM_BLOCK_DUMP, | |
796 | .procname = "block_dump", | |
797 | .data = &block_dump, | |
798 | .maxlen = sizeof(block_dump), | |
799 | .mode = 0644, | |
800 | .proc_handler = &proc_dointvec, | |
801 | .strategy = &sysctl_intvec, | |
802 | .extra1 = &zero, | |
803 | }, | |
804 | { | |
805 | .ctl_name = VM_VFS_CACHE_PRESSURE, | |
806 | .procname = "vfs_cache_pressure", | |
807 | .data = &sysctl_vfs_cache_pressure, | |
808 | .maxlen = sizeof(sysctl_vfs_cache_pressure), | |
809 | .mode = 0644, | |
810 | .proc_handler = &proc_dointvec, | |
811 | .strategy = &sysctl_intvec, | |
812 | .extra1 = &zero, | |
813 | }, | |
814 | #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT | |
815 | { | |
816 | .ctl_name = VM_LEGACY_VA_LAYOUT, | |
817 | .procname = "legacy_va_layout", | |
818 | .data = &sysctl_legacy_va_layout, | |
819 | .maxlen = sizeof(sysctl_legacy_va_layout), | |
820 | .mode = 0644, | |
821 | .proc_handler = &proc_dointvec, | |
822 | .strategy = &sysctl_intvec, | |
823 | .extra1 = &zero, | |
824 | }, | |
825 | #endif | |
1743660b CL |
826 | #ifdef CONFIG_NUMA |
827 | { | |
828 | .ctl_name = VM_ZONE_RECLAIM_MODE, | |
829 | .procname = "zone_reclaim_mode", | |
830 | .data = &zone_reclaim_mode, | |
831 | .maxlen = sizeof(zone_reclaim_mode), | |
832 | .mode = 0644, | |
833 | .proc_handler = &proc_dointvec, | |
c84db23c CL |
834 | .strategy = &sysctl_intvec, |
835 | .extra1 = &zero, | |
1743660b | 836 | }, |
9614634f CL |
837 | { |
838 | .ctl_name = VM_MIN_UNMAPPED, | |
839 | .procname = "min_unmapped_ratio", | |
840 | .data = &sysctl_min_unmapped_ratio, | |
841 | .maxlen = sizeof(sysctl_min_unmapped_ratio), | |
842 | .mode = 0644, | |
843 | .proc_handler = &sysctl_min_unmapped_ratio_sysctl_handler, | |
844 | .strategy = &sysctl_intvec, | |
845 | .extra1 = &zero, | |
846 | .extra2 = &one_hundred, | |
847 | }, | |
0ff38490 CL |
848 | { |
849 | .ctl_name = VM_MIN_SLAB, | |
850 | .procname = "min_slab_ratio", | |
851 | .data = &sysctl_min_slab_ratio, | |
852 | .maxlen = sizeof(sysctl_min_slab_ratio), | |
853 | .mode = 0644, | |
854 | .proc_handler = &sysctl_min_slab_ratio_sysctl_handler, | |
855 | .strategy = &sysctl_intvec, | |
856 | .extra1 = &zero, | |
857 | .extra2 = &one_hundred, | |
858 | }, | |
e6e5494c | 859 | #endif |
5c36e657 PM |
860 | #if defined(CONFIG_X86_32) || \ |
861 | (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL)) | |
e6e5494c IM |
862 | { |
863 | .ctl_name = VM_VDSO_ENABLED, | |
864 | .procname = "vdso_enabled", | |
865 | .data = &vdso_enabled, | |
866 | .maxlen = sizeof(vdso_enabled), | |
867 | .mode = 0644, | |
868 | .proc_handler = &proc_dointvec, | |
869 | .strategy = &sysctl_intvec, | |
870 | .extra1 = &zero, | |
871 | }, | |
1da177e4 LT |
872 | #endif |
873 | { .ctl_name = 0 } | |
874 | }; | |
875 | ||
2abc26fc EB |
876 | #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) |
877 | static ctl_table binfmt_misc_table[] = { | |
878 | { .ctl_name = 0 } | |
879 | }; | |
880 | #endif | |
881 | ||
1da177e4 LT |
882 | static ctl_table fs_table[] = { |
883 | { | |
884 | .ctl_name = FS_NRINODE, | |
885 | .procname = "inode-nr", | |
886 | .data = &inodes_stat, | |
887 | .maxlen = 2*sizeof(int), | |
888 | .mode = 0444, | |
889 | .proc_handler = &proc_dointvec, | |
890 | }, | |
891 | { | |
892 | .ctl_name = FS_STATINODE, | |
893 | .procname = "inode-state", | |
894 | .data = &inodes_stat, | |
895 | .maxlen = 7*sizeof(int), | |
896 | .mode = 0444, | |
897 | .proc_handler = &proc_dointvec, | |
898 | }, | |
899 | { | |
900 | .ctl_name = FS_NRFILE, | |
901 | .procname = "file-nr", | |
902 | .data = &files_stat, | |
903 | .maxlen = 3*sizeof(int), | |
904 | .mode = 0444, | |
529bf6be | 905 | .proc_handler = &proc_nr_files, |
1da177e4 LT |
906 | }, |
907 | { | |
908 | .ctl_name = FS_MAXFILE, | |
909 | .procname = "file-max", | |
910 | .data = &files_stat.max_files, | |
911 | .maxlen = sizeof(int), | |
912 | .mode = 0644, | |
913 | .proc_handler = &proc_dointvec, | |
914 | }, | |
915 | { | |
916 | .ctl_name = FS_DENTRY, | |
917 | .procname = "dentry-state", | |
918 | .data = &dentry_stat, | |
919 | .maxlen = 6*sizeof(int), | |
920 | .mode = 0444, | |
921 | .proc_handler = &proc_dointvec, | |
922 | }, | |
923 | { | |
924 | .ctl_name = FS_OVERFLOWUID, | |
925 | .procname = "overflowuid", | |
926 | .data = &fs_overflowuid, | |
927 | .maxlen = sizeof(int), | |
928 | .mode = 0644, | |
929 | .proc_handler = &proc_dointvec_minmax, | |
930 | .strategy = &sysctl_intvec, | |
931 | .extra1 = &minolduid, | |
932 | .extra2 = &maxolduid, | |
933 | }, | |
934 | { | |
935 | .ctl_name = FS_OVERFLOWGID, | |
936 | .procname = "overflowgid", | |
937 | .data = &fs_overflowgid, | |
938 | .maxlen = sizeof(int), | |
939 | .mode = 0644, | |
940 | .proc_handler = &proc_dointvec_minmax, | |
941 | .strategy = &sysctl_intvec, | |
942 | .extra1 = &minolduid, | |
943 | .extra2 = &maxolduid, | |
944 | }, | |
945 | { | |
946 | .ctl_name = FS_LEASES, | |
947 | .procname = "leases-enable", | |
948 | .data = &leases_enable, | |
949 | .maxlen = sizeof(int), | |
950 | .mode = 0644, | |
951 | .proc_handler = &proc_dointvec, | |
952 | }, | |
953 | #ifdef CONFIG_DNOTIFY | |
954 | { | |
955 | .ctl_name = FS_DIR_NOTIFY, | |
956 | .procname = "dir-notify-enable", | |
957 | .data = &dir_notify_enable, | |
958 | .maxlen = sizeof(int), | |
959 | .mode = 0644, | |
960 | .proc_handler = &proc_dointvec, | |
961 | }, | |
962 | #endif | |
963 | #ifdef CONFIG_MMU | |
964 | { | |
965 | .ctl_name = FS_LEASE_TIME, | |
966 | .procname = "lease-break-time", | |
967 | .data = &lease_break_time, | |
968 | .maxlen = sizeof(int), | |
969 | .mode = 0644, | |
970 | .proc_handler = &proc_dointvec, | |
971 | }, | |
972 | { | |
973 | .ctl_name = FS_AIO_NR, | |
974 | .procname = "aio-nr", | |
975 | .data = &aio_nr, | |
976 | .maxlen = sizeof(aio_nr), | |
977 | .mode = 0444, | |
d55b5fda | 978 | .proc_handler = &proc_doulongvec_minmax, |
1da177e4 LT |
979 | }, |
980 | { | |
981 | .ctl_name = FS_AIO_MAX_NR, | |
982 | .procname = "aio-max-nr", | |
983 | .data = &aio_max_nr, | |
984 | .maxlen = sizeof(aio_max_nr), | |
985 | .mode = 0644, | |
d55b5fda | 986 | .proc_handler = &proc_doulongvec_minmax, |
1da177e4 | 987 | }, |
2d9048e2 | 988 | #ifdef CONFIG_INOTIFY_USER |
0399cb08 RL |
989 | { |
990 | .ctl_name = FS_INOTIFY, | |
991 | .procname = "inotify", | |
992 | .mode = 0555, | |
993 | .child = inotify_table, | |
994 | }, | |
995 | #endif | |
1da177e4 | 996 | #endif |
d6e71144 AC |
997 | { |
998 | .ctl_name = KERN_SETUID_DUMPABLE, | |
999 | .procname = "suid_dumpable", | |
1000 | .data = &suid_dumpable, | |
1001 | .maxlen = sizeof(int), | |
1002 | .mode = 0644, | |
1003 | .proc_handler = &proc_dointvec, | |
1004 | }, | |
2abc26fc EB |
1005 | #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) |
1006 | { | |
1007 | .ctl_name = CTL_UNNUMBERED, | |
1008 | .procname = "binfmt_misc", | |
1009 | .mode = 0555, | |
1010 | .child = binfmt_misc_table, | |
1011 | }, | |
1012 | #endif | |
1da177e4 LT |
1013 | { .ctl_name = 0 } |
1014 | }; | |
1015 | ||
1016 | static ctl_table debug_table[] = { | |
1017 | { .ctl_name = 0 } | |
1018 | }; | |
1019 | ||
1020 | static ctl_table dev_table[] = { | |
1021 | { .ctl_name = 0 } | |
0eeca283 | 1022 | }; |
1da177e4 | 1023 | |
330d57fb AV |
1024 | static DEFINE_SPINLOCK(sysctl_lock); |
1025 | ||
1026 | /* called under sysctl_lock */ | |
1027 | static int use_table(struct ctl_table_header *p) | |
1028 | { | |
1029 | if (unlikely(p->unregistering)) | |
1030 | return 0; | |
1031 | p->used++; | |
1032 | return 1; | |
1033 | } | |
1034 | ||
1035 | /* called under sysctl_lock */ | |
1036 | static void unuse_table(struct ctl_table_header *p) | |
1037 | { | |
1038 | if (!--p->used) | |
1039 | if (unlikely(p->unregistering)) | |
1040 | complete(p->unregistering); | |
1041 | } | |
1042 | ||
1043 | /* called under sysctl_lock, will reacquire if has to wait */ | |
1044 | static void start_unregistering(struct ctl_table_header *p) | |
1045 | { | |
1046 | /* | |
1047 | * if p->used is 0, nobody will ever touch that entry again; | |
1048 | * we'll eliminate all paths to it before dropping sysctl_lock | |
1049 | */ | |
1050 | if (unlikely(p->used)) { | |
1051 | struct completion wait; | |
1052 | init_completion(&wait); | |
1053 | p->unregistering = &wait; | |
1054 | spin_unlock(&sysctl_lock); | |
1055 | wait_for_completion(&wait); | |
1056 | spin_lock(&sysctl_lock); | |
1057 | } | |
1058 | /* | |
1059 | * do not remove from the list until nobody holds it; walking the | |
1060 | * list in do_sysctl() relies on that. | |
1061 | */ | |
1062 | list_del_init(&p->ctl_entry); | |
1063 | } | |
1064 | ||
805b5d5e EB |
1065 | void sysctl_head_finish(struct ctl_table_header *head) |
1066 | { | |
1067 | if (!head) | |
1068 | return; | |
1069 | spin_lock(&sysctl_lock); | |
1070 | unuse_table(head); | |
1071 | spin_unlock(&sysctl_lock); | |
1072 | } | |
1073 | ||
1074 | struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev) | |
1075 | { | |
1076 | struct ctl_table_header *head; | |
1077 | struct list_head *tmp; | |
1078 | spin_lock(&sysctl_lock); | |
1079 | if (prev) { | |
1080 | tmp = &prev->ctl_entry; | |
1081 | unuse_table(prev); | |
1082 | goto next; | |
1083 | } | |
1084 | tmp = &root_table_header.ctl_entry; | |
1085 | for (;;) { | |
1086 | head = list_entry(tmp, struct ctl_table_header, ctl_entry); | |
1087 | ||
1088 | if (!use_table(head)) | |
1089 | goto next; | |
1090 | spin_unlock(&sysctl_lock); | |
1091 | return head; | |
1092 | next: | |
1093 | tmp = tmp->next; | |
1094 | if (tmp == &root_table_header.ctl_entry) | |
1095 | break; | |
1096 | } | |
1097 | spin_unlock(&sysctl_lock); | |
1098 | return NULL; | |
1099 | } | |
1100 | ||
b89a8171 | 1101 | #ifdef CONFIG_SYSCTL_SYSCALL |
1da177e4 LT |
1102 | int do_sysctl(int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp, |
1103 | void __user *newval, size_t newlen) | |
1104 | { | |
805b5d5e | 1105 | struct ctl_table_header *head; |
330d57fb | 1106 | int error = -ENOTDIR; |
1da177e4 LT |
1107 | |
1108 | if (nlen <= 0 || nlen >= CTL_MAXNAME) | |
1109 | return -ENOTDIR; | |
1110 | if (oldval) { | |
1111 | int old_len; | |
1112 | if (!oldlenp || get_user(old_len, oldlenp)) | |
1113 | return -EFAULT; | |
1114 | } | |
330d57fb | 1115 | |
805b5d5e EB |
1116 | for (head = sysctl_head_next(NULL); head; |
1117 | head = sysctl_head_next(head)) { | |
330d57fb | 1118 | error = parse_table(name, nlen, oldval, oldlenp, |
1f29bcd7 | 1119 | newval, newlen, head->ctl_table); |
805b5d5e EB |
1120 | if (error != -ENOTDIR) { |
1121 | sysctl_head_finish(head); | |
330d57fb | 1122 | break; |
805b5d5e EB |
1123 | } |
1124 | } | |
330d57fb | 1125 | return error; |
1da177e4 LT |
1126 | } |
1127 | ||
1128 | asmlinkage long sys_sysctl(struct __sysctl_args __user *args) | |
1129 | { | |
1130 | struct __sysctl_args tmp; | |
1131 | int error; | |
1132 | ||
1133 | if (copy_from_user(&tmp, args, sizeof(tmp))) | |
1134 | return -EFAULT; | |
1135 | ||
1136 | lock_kernel(); | |
1137 | error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp, | |
1138 | tmp.newval, tmp.newlen); | |
1139 | unlock_kernel(); | |
1140 | return error; | |
1141 | } | |
b89a8171 | 1142 | #endif /* CONFIG_SYSCTL_SYSCALL */ |
1da177e4 LT |
1143 | |
1144 | /* | |
1ff007eb | 1145 | * sysctl_perm does NOT grant the superuser all rights automatically, because |
1da177e4 LT |
1146 | * some sysctl variables are readonly even to root. |
1147 | */ | |
1148 | ||
1149 | static int test_perm(int mode, int op) | |
1150 | { | |
1151 | if (!current->euid) | |
1152 | mode >>= 6; | |
1153 | else if (in_egroup_p(0)) | |
1154 | mode >>= 3; | |
1155 | if ((mode & op & 0007) == op) | |
1156 | return 0; | |
1157 | return -EACCES; | |
1158 | } | |
1159 | ||
1ff007eb | 1160 | int sysctl_perm(ctl_table *table, int op) |
1da177e4 LT |
1161 | { |
1162 | int error; | |
1163 | error = security_sysctl(table, op); | |
1164 | if (error) | |
1165 | return error; | |
1166 | return test_perm(table->mode, op); | |
1167 | } | |
1168 | ||
b89a8171 | 1169 | #ifdef CONFIG_SYSCTL_SYSCALL |
1da177e4 LT |
1170 | static int parse_table(int __user *name, int nlen, |
1171 | void __user *oldval, size_t __user *oldlenp, | |
1172 | void __user *newval, size_t newlen, | |
1f29bcd7 | 1173 | ctl_table *table) |
1da177e4 LT |
1174 | { |
1175 | int n; | |
1176 | repeat: | |
1177 | if (!nlen) | |
1178 | return -ENOTDIR; | |
1179 | if (get_user(n, name)) | |
1180 | return -EFAULT; | |
d99f160a EB |
1181 | for ( ; table->ctl_name || table->procname; table++) { |
1182 | if (!table->ctl_name) | |
1183 | continue; | |
6703ddfc | 1184 | if (n == table->ctl_name) { |
1da177e4 LT |
1185 | int error; |
1186 | if (table->child) { | |
1ff007eb | 1187 | if (sysctl_perm(table, 001)) |
1da177e4 | 1188 | return -EPERM; |
1da177e4 LT |
1189 | name++; |
1190 | nlen--; | |
1191 | table = table->child; | |
1192 | goto repeat; | |
1193 | } | |
1194 | error = do_sysctl_strategy(table, name, nlen, | |
1195 | oldval, oldlenp, | |
1f29bcd7 | 1196 | newval, newlen); |
1da177e4 LT |
1197 | return error; |
1198 | } | |
1199 | } | |
1200 | return -ENOTDIR; | |
1201 | } | |
1202 | ||
1203 | /* Perform the actual read/write of a sysctl table entry. */ | |
1204 | int do_sysctl_strategy (ctl_table *table, | |
1205 | int __user *name, int nlen, | |
1206 | void __user *oldval, size_t __user *oldlenp, | |
1f29bcd7 | 1207 | void __user *newval, size_t newlen) |
1da177e4 LT |
1208 | { |
1209 | int op = 0, rc; | |
1210 | size_t len; | |
1211 | ||
1212 | if (oldval) | |
1213 | op |= 004; | |
1214 | if (newval) | |
1215 | op |= 002; | |
1ff007eb | 1216 | if (sysctl_perm(table, op)) |
1da177e4 LT |
1217 | return -EPERM; |
1218 | ||
1219 | if (table->strategy) { | |
1220 | rc = table->strategy(table, name, nlen, oldval, oldlenp, | |
1f29bcd7 | 1221 | newval, newlen); |
1da177e4 LT |
1222 | if (rc < 0) |
1223 | return rc; | |
1224 | if (rc > 0) | |
1225 | return 0; | |
1226 | } | |
1227 | ||
1228 | /* If there is no strategy routine, or if the strategy returns | |
1229 | * zero, proceed with automatic r/w */ | |
1230 | if (table->data && table->maxlen) { | |
1231 | if (oldval && oldlenp) { | |
1232 | if (get_user(len, oldlenp)) | |
1233 | return -EFAULT; | |
1234 | if (len) { | |
1235 | if (len > table->maxlen) | |
1236 | len = table->maxlen; | |
1237 | if(copy_to_user(oldval, table->data, len)) | |
1238 | return -EFAULT; | |
1239 | if(put_user(len, oldlenp)) | |
1240 | return -EFAULT; | |
1241 | } | |
1242 | } | |
1243 | if (newval && newlen) { | |
1244 | len = newlen; | |
1245 | if (len > table->maxlen) | |
1246 | len = table->maxlen; | |
1247 | if(copy_from_user(table->data, newval, len)) | |
1248 | return -EFAULT; | |
1249 | } | |
1250 | } | |
1251 | return 0; | |
1252 | } | |
b89a8171 | 1253 | #endif /* CONFIG_SYSCTL_SYSCALL */ |
1da177e4 | 1254 | |
d912b0cc EB |
1255 | static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table) |
1256 | { | |
1257 | for (; table->ctl_name || table->procname; table++) { | |
1258 | table->parent = parent; | |
1259 | if (table->child) | |
1260 | sysctl_set_parent(table, table->child); | |
1261 | } | |
1262 | } | |
1263 | ||
1264 | static __init int sysctl_init(void) | |
1265 | { | |
1266 | sysctl_set_parent(NULL, root_table); | |
1267 | return 0; | |
1268 | } | |
1269 | ||
1270 | core_initcall(sysctl_init); | |
1271 | ||
1da177e4 LT |
1272 | /** |
1273 | * register_sysctl_table - register a sysctl hierarchy | |
1274 | * @table: the top-level table structure | |
1da177e4 LT |
1275 | * |
1276 | * Register a sysctl table hierarchy. @table should be a filled in ctl_table | |
1277 | * array. An entry with a ctl_name of 0 terminates the table. | |
1278 | * | |
1279 | * The members of the &ctl_table structure are used as follows: | |
1280 | * | |
1281 | * ctl_name - This is the numeric sysctl value used by sysctl(2). The number | |
1282 | * must be unique within that level of sysctl | |
1283 | * | |
1284 | * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not | |
1285 | * enter a sysctl file | |
1286 | * | |
1287 | * data - a pointer to data for use by proc_handler | |
1288 | * | |
1289 | * maxlen - the maximum size in bytes of the data | |
1290 | * | |
1291 | * mode - the file permissions for the /proc/sys file, and for sysctl(2) | |
1292 | * | |
1293 | * child - a pointer to the child sysctl table if this entry is a directory, or | |
1294 | * %NULL. | |
1295 | * | |
1296 | * proc_handler - the text handler routine (described below) | |
1297 | * | |
1298 | * strategy - the strategy routine (described below) | |
1299 | * | |
1300 | * de - for internal use by the sysctl routines | |
1301 | * | |
1302 | * extra1, extra2 - extra pointers usable by the proc handler routines | |
1303 | * | |
1304 | * Leaf nodes in the sysctl tree will be represented by a single file | |
1305 | * under /proc; non-leaf nodes will be represented by directories. | |
1306 | * | |
1307 | * sysctl(2) can automatically manage read and write requests through | |
1308 | * the sysctl table. The data and maxlen fields of the ctl_table | |
1309 | * struct enable minimal validation of the values being written to be | |
1310 | * performed, and the mode field allows minimal authentication. | |
1311 | * | |
1312 | * More sophisticated management can be enabled by the provision of a | |
1313 | * strategy routine with the table entry. This will be called before | |
1314 | * any automatic read or write of the data is performed. | |
1315 | * | |
1316 | * The strategy routine may return | |
1317 | * | |
1318 | * < 0 - Error occurred (error is passed to user process) | |
1319 | * | |
1320 | * 0 - OK - proceed with automatic read or write. | |
1321 | * | |
1322 | * > 0 - OK - read or write has been done by the strategy routine, so | |
1323 | * return immediately. | |
1324 | * | |
1325 | * There must be a proc_handler routine for any terminal nodes | |
1326 | * mirrored under /proc/sys (non-terminals are handled by a built-in | |
1327 | * directory handler). Several default handlers are available to | |
1328 | * cover common cases - | |
1329 | * | |
1330 | * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(), | |
1331 | * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(), | |
1332 | * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax() | |
1333 | * | |
1334 | * It is the handler's job to read the input buffer from user memory | |
1335 | * and process it. The handler should return 0 on success. | |
1336 | * | |
1337 | * This routine returns %NULL on a failure to register, and a pointer | |
1338 | * to the table header on success. | |
1339 | */ | |
0b4d4147 | 1340 | struct ctl_table_header *register_sysctl_table(ctl_table * table) |
1da177e4 LT |
1341 | { |
1342 | struct ctl_table_header *tmp; | |
1343 | tmp = kmalloc(sizeof(struct ctl_table_header), GFP_KERNEL); | |
1344 | if (!tmp) | |
1345 | return NULL; | |
1346 | tmp->ctl_table = table; | |
1347 | INIT_LIST_HEAD(&tmp->ctl_entry); | |
330d57fb AV |
1348 | tmp->used = 0; |
1349 | tmp->unregistering = NULL; | |
d912b0cc | 1350 | sysctl_set_parent(NULL, table); |
330d57fb | 1351 | spin_lock(&sysctl_lock); |
0b4d4147 | 1352 | list_add_tail(&tmp->ctl_entry, &root_table_header.ctl_entry); |
330d57fb | 1353 | spin_unlock(&sysctl_lock); |
1da177e4 LT |
1354 | return tmp; |
1355 | } | |
1356 | ||
1357 | /** | |
1358 | * unregister_sysctl_table - unregister a sysctl table hierarchy | |
1359 | * @header: the header returned from register_sysctl_table | |
1360 | * | |
1361 | * Unregisters the sysctl table and all children. proc entries may not | |
1362 | * actually be removed until they are no longer used by anyone. | |
1363 | */ | |
1364 | void unregister_sysctl_table(struct ctl_table_header * header) | |
1365 | { | |
330d57fb AV |
1366 | might_sleep(); |
1367 | spin_lock(&sysctl_lock); | |
1368 | start_unregistering(header); | |
330d57fb | 1369 | spin_unlock(&sysctl_lock); |
1da177e4 LT |
1370 | kfree(header); |
1371 | } | |
1372 | ||
b89a8171 | 1373 | #else /* !CONFIG_SYSCTL */ |
93a6fefe | 1374 | struct ctl_table_header *register_sysctl_table(ctl_table * table) |
b89a8171 EB |
1375 | { |
1376 | return NULL; | |
1377 | } | |
1378 | ||
1379 | void unregister_sysctl_table(struct ctl_table_header * table) | |
1380 | { | |
1381 | } | |
1382 | ||
1383 | #endif /* CONFIG_SYSCTL */ | |
1384 | ||
1da177e4 LT |
1385 | /* |
1386 | * /proc/sys support | |
1387 | */ | |
1388 | ||
b89a8171 | 1389 | #ifdef CONFIG_PROC_SYSCTL |
1da177e4 | 1390 | |
b1ba4ddd AB |
1391 | static int _proc_do_string(void* data, int maxlen, int write, |
1392 | struct file *filp, void __user *buffer, | |
1393 | size_t *lenp, loff_t *ppos) | |
1da177e4 LT |
1394 | { |
1395 | size_t len; | |
1396 | char __user *p; | |
1397 | char c; | |
8d060877 ON |
1398 | |
1399 | if (!data || !maxlen || !*lenp) { | |
1da177e4 LT |
1400 | *lenp = 0; |
1401 | return 0; | |
1402 | } | |
8d060877 | 1403 | |
1da177e4 LT |
1404 | if (write) { |
1405 | len = 0; | |
1406 | p = buffer; | |
1407 | while (len < *lenp) { | |
1408 | if (get_user(c, p++)) | |
1409 | return -EFAULT; | |
1410 | if (c == 0 || c == '\n') | |
1411 | break; | |
1412 | len++; | |
1413 | } | |
f5dd3d6f SV |
1414 | if (len >= maxlen) |
1415 | len = maxlen-1; | |
1416 | if(copy_from_user(data, buffer, len)) | |
1da177e4 | 1417 | return -EFAULT; |
f5dd3d6f | 1418 | ((char *) data)[len] = 0; |
1da177e4 LT |
1419 | *ppos += *lenp; |
1420 | } else { | |
f5dd3d6f SV |
1421 | len = strlen(data); |
1422 | if (len > maxlen) | |
1423 | len = maxlen; | |
8d060877 ON |
1424 | |
1425 | if (*ppos > len) { | |
1426 | *lenp = 0; | |
1427 | return 0; | |
1428 | } | |
1429 | ||
1430 | data += *ppos; | |
1431 | len -= *ppos; | |
1432 | ||
1da177e4 LT |
1433 | if (len > *lenp) |
1434 | len = *lenp; | |
1435 | if (len) | |
f5dd3d6f | 1436 | if(copy_to_user(buffer, data, len)) |
1da177e4 LT |
1437 | return -EFAULT; |
1438 | if (len < *lenp) { | |
1439 | if(put_user('\n', ((char __user *) buffer) + len)) | |
1440 | return -EFAULT; | |
1441 | len++; | |
1442 | } | |
1443 | *lenp = len; | |
1444 | *ppos += len; | |
1445 | } | |
1446 | return 0; | |
1447 | } | |
1448 | ||
f5dd3d6f SV |
1449 | /** |
1450 | * proc_dostring - read a string sysctl | |
1451 | * @table: the sysctl table | |
1452 | * @write: %TRUE if this is a write to the sysctl file | |
1453 | * @filp: the file structure | |
1454 | * @buffer: the user buffer | |
1455 | * @lenp: the size of the user buffer | |
1456 | * @ppos: file position | |
1457 | * | |
1458 | * Reads/writes a string from/to the user buffer. If the kernel | |
1459 | * buffer provided is not large enough to hold the string, the | |
1460 | * string is truncated. The copied string is %NULL-terminated. | |
1461 | * If the string is being read by the user process, it is copied | |
1462 | * and a newline '\n' is added. It is truncated if the buffer is | |
1463 | * not large enough. | |
1464 | * | |
1465 | * Returns 0 on success. | |
1466 | */ | |
1467 | int proc_dostring(ctl_table *table, int write, struct file *filp, | |
1468 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
1469 | { | |
1470 | return _proc_do_string(table->data, table->maxlen, write, filp, | |
1471 | buffer, lenp, ppos); | |
1472 | } | |
1473 | ||
1da177e4 LT |
1474 | |
1475 | static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp, | |
1476 | int *valp, | |
1477 | int write, void *data) | |
1478 | { | |
1479 | if (write) { | |
1480 | *valp = *negp ? -*lvalp : *lvalp; | |
1481 | } else { | |
1482 | int val = *valp; | |
1483 | if (val < 0) { | |
1484 | *negp = -1; | |
1485 | *lvalp = (unsigned long)-val; | |
1486 | } else { | |
1487 | *negp = 0; | |
1488 | *lvalp = (unsigned long)val; | |
1489 | } | |
1490 | } | |
1491 | return 0; | |
1492 | } | |
1493 | ||
fcfbd547 KK |
1494 | static int __do_proc_dointvec(void *tbl_data, ctl_table *table, |
1495 | int write, struct file *filp, void __user *buffer, | |
1496 | size_t *lenp, loff_t *ppos, | |
1da177e4 LT |
1497 | int (*conv)(int *negp, unsigned long *lvalp, int *valp, |
1498 | int write, void *data), | |
1499 | void *data) | |
1500 | { | |
1501 | #define TMPBUFLEN 21 | |
1502 | int *i, vleft, first=1, neg, val; | |
1503 | unsigned long lval; | |
1504 | size_t left, len; | |
1505 | ||
1506 | char buf[TMPBUFLEN], *p; | |
1507 | char __user *s = buffer; | |
1508 | ||
fcfbd547 | 1509 | if (!tbl_data || !table->maxlen || !*lenp || |
1da177e4 LT |
1510 | (*ppos && !write)) { |
1511 | *lenp = 0; | |
1512 | return 0; | |
1513 | } | |
1514 | ||
fcfbd547 | 1515 | i = (int *) tbl_data; |
1da177e4 LT |
1516 | vleft = table->maxlen / sizeof(*i); |
1517 | left = *lenp; | |
1518 | ||
1519 | if (!conv) | |
1520 | conv = do_proc_dointvec_conv; | |
1521 | ||
1522 | for (; left && vleft--; i++, first=0) { | |
1523 | if (write) { | |
1524 | while (left) { | |
1525 | char c; | |
1526 | if (get_user(c, s)) | |
1527 | return -EFAULT; | |
1528 | if (!isspace(c)) | |
1529 | break; | |
1530 | left--; | |
1531 | s++; | |
1532 | } | |
1533 | if (!left) | |
1534 | break; | |
1535 | neg = 0; | |
1536 | len = left; | |
1537 | if (len > sizeof(buf) - 1) | |
1538 | len = sizeof(buf) - 1; | |
1539 | if (copy_from_user(buf, s, len)) | |
1540 | return -EFAULT; | |
1541 | buf[len] = 0; | |
1542 | p = buf; | |
1543 | if (*p == '-' && left > 1) { | |
1544 | neg = 1; | |
bd9b0bac | 1545 | p++; |
1da177e4 LT |
1546 | } |
1547 | if (*p < '0' || *p > '9') | |
1548 | break; | |
1549 | ||
1550 | lval = simple_strtoul(p, &p, 0); | |
1551 | ||
1552 | len = p-buf; | |
1553 | if ((len < left) && *p && !isspace(*p)) | |
1554 | break; | |
1555 | if (neg) | |
1556 | val = -val; | |
1557 | s += len; | |
1558 | left -= len; | |
1559 | ||
1560 | if (conv(&neg, &lval, i, 1, data)) | |
1561 | break; | |
1562 | } else { | |
1563 | p = buf; | |
1564 | if (!first) | |
1565 | *p++ = '\t'; | |
1566 | ||
1567 | if (conv(&neg, &lval, i, 0, data)) | |
1568 | break; | |
1569 | ||
1570 | sprintf(p, "%s%lu", neg ? "-" : "", lval); | |
1571 | len = strlen(buf); | |
1572 | if (len > left) | |
1573 | len = left; | |
1574 | if(copy_to_user(s, buf, len)) | |
1575 | return -EFAULT; | |
1576 | left -= len; | |
1577 | s += len; | |
1578 | } | |
1579 | } | |
1580 | ||
1581 | if (!write && !first && left) { | |
1582 | if(put_user('\n', s)) | |
1583 | return -EFAULT; | |
1584 | left--, s++; | |
1585 | } | |
1586 | if (write) { | |
1587 | while (left) { | |
1588 | char c; | |
1589 | if (get_user(c, s++)) | |
1590 | return -EFAULT; | |
1591 | if (!isspace(c)) | |
1592 | break; | |
1593 | left--; | |
1594 | } | |
1595 | } | |
1596 | if (write && first) | |
1597 | return -EINVAL; | |
1598 | *lenp -= left; | |
1599 | *ppos += *lenp; | |
1600 | return 0; | |
1601 | #undef TMPBUFLEN | |
1602 | } | |
1603 | ||
fcfbd547 KK |
1604 | static int do_proc_dointvec(ctl_table *table, int write, struct file *filp, |
1605 | void __user *buffer, size_t *lenp, loff_t *ppos, | |
1606 | int (*conv)(int *negp, unsigned long *lvalp, int *valp, | |
1607 | int write, void *data), | |
1608 | void *data) | |
1609 | { | |
1610 | return __do_proc_dointvec(table->data, table, write, filp, | |
1611 | buffer, lenp, ppos, conv, data); | |
1612 | } | |
1613 | ||
1da177e4 LT |
1614 | /** |
1615 | * proc_dointvec - read a vector of integers | |
1616 | * @table: the sysctl table | |
1617 | * @write: %TRUE if this is a write to the sysctl file | |
1618 | * @filp: the file structure | |
1619 | * @buffer: the user buffer | |
1620 | * @lenp: the size of the user buffer | |
1621 | * @ppos: file position | |
1622 | * | |
1623 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer | |
1624 | * values from/to the user buffer, treated as an ASCII string. | |
1625 | * | |
1626 | * Returns 0 on success. | |
1627 | */ | |
1628 | int proc_dointvec(ctl_table *table, int write, struct file *filp, | |
1629 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
1630 | { | |
1631 | return do_proc_dointvec(table,write,filp,buffer,lenp,ppos, | |
1632 | NULL,NULL); | |
1633 | } | |
1634 | ||
1635 | #define OP_SET 0 | |
1636 | #define OP_AND 1 | |
34f5a398 | 1637 | #define OP_OR 2 |
1da177e4 LT |
1638 | |
1639 | static int do_proc_dointvec_bset_conv(int *negp, unsigned long *lvalp, | |
1640 | int *valp, | |
1641 | int write, void *data) | |
1642 | { | |
1643 | int op = *(int *)data; | |
1644 | if (write) { | |
1645 | int val = *negp ? -*lvalp : *lvalp; | |
1646 | switch(op) { | |
1647 | case OP_SET: *valp = val; break; | |
1648 | case OP_AND: *valp &= val; break; | |
34f5a398 | 1649 | case OP_OR: *valp |= val; break; |
1da177e4 LT |
1650 | } |
1651 | } else { | |
1652 | int val = *valp; | |
1653 | if (val < 0) { | |
1654 | *negp = -1; | |
1655 | *lvalp = (unsigned long)-val; | |
1656 | } else { | |
1657 | *negp = 0; | |
1658 | *lvalp = (unsigned long)val; | |
1659 | } | |
1660 | } | |
1661 | return 0; | |
1662 | } | |
1663 | ||
1664 | /* | |
1665 | * init may raise the set. | |
1666 | */ | |
1667 | ||
1668 | int proc_dointvec_bset(ctl_table *table, int write, struct file *filp, | |
1669 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
1670 | { | |
1671 | int op; | |
1672 | ||
6ff1b442 | 1673 | if (write && !capable(CAP_SYS_MODULE)) { |
1da177e4 LT |
1674 | return -EPERM; |
1675 | } | |
1676 | ||
f400e198 | 1677 | op = is_init(current) ? OP_SET : OP_AND; |
1da177e4 LT |
1678 | return do_proc_dointvec(table,write,filp,buffer,lenp,ppos, |
1679 | do_proc_dointvec_bset_conv,&op); | |
1680 | } | |
1681 | ||
34f5a398 TT |
1682 | /* |
1683 | * Taint values can only be increased | |
1684 | */ | |
1685 | static int proc_dointvec_taint(ctl_table *table, int write, struct file *filp, | |
1686 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
1687 | { | |
1688 | int op; | |
1689 | ||
91fcd412 | 1690 | if (write && !capable(CAP_SYS_ADMIN)) |
34f5a398 TT |
1691 | return -EPERM; |
1692 | ||
1693 | op = OP_OR; | |
1694 | return do_proc_dointvec(table,write,filp,buffer,lenp,ppos, | |
1695 | do_proc_dointvec_bset_conv,&op); | |
1696 | } | |
1697 | ||
1da177e4 LT |
1698 | struct do_proc_dointvec_minmax_conv_param { |
1699 | int *min; | |
1700 | int *max; | |
1701 | }; | |
1702 | ||
1703 | static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp, | |
1704 | int *valp, | |
1705 | int write, void *data) | |
1706 | { | |
1707 | struct do_proc_dointvec_minmax_conv_param *param = data; | |
1708 | if (write) { | |
1709 | int val = *negp ? -*lvalp : *lvalp; | |
1710 | if ((param->min && *param->min > val) || | |
1711 | (param->max && *param->max < val)) | |
1712 | return -EINVAL; | |
1713 | *valp = val; | |
1714 | } else { | |
1715 | int val = *valp; | |
1716 | if (val < 0) { | |
1717 | *negp = -1; | |
1718 | *lvalp = (unsigned long)-val; | |
1719 | } else { | |
1720 | *negp = 0; | |
1721 | *lvalp = (unsigned long)val; | |
1722 | } | |
1723 | } | |
1724 | return 0; | |
1725 | } | |
1726 | ||
1727 | /** | |
1728 | * proc_dointvec_minmax - read a vector of integers with min/max values | |
1729 | * @table: the sysctl table | |
1730 | * @write: %TRUE if this is a write to the sysctl file | |
1731 | * @filp: the file structure | |
1732 | * @buffer: the user buffer | |
1733 | * @lenp: the size of the user buffer | |
1734 | * @ppos: file position | |
1735 | * | |
1736 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer | |
1737 | * values from/to the user buffer, treated as an ASCII string. | |
1738 | * | |
1739 | * This routine will ensure the values are within the range specified by | |
1740 | * table->extra1 (min) and table->extra2 (max). | |
1741 | * | |
1742 | * Returns 0 on success. | |
1743 | */ | |
1744 | int proc_dointvec_minmax(ctl_table *table, int write, struct file *filp, | |
1745 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
1746 | { | |
1747 | struct do_proc_dointvec_minmax_conv_param param = { | |
1748 | .min = (int *) table->extra1, | |
1749 | .max = (int *) table->extra2, | |
1750 | }; | |
1751 | return do_proc_dointvec(table, write, filp, buffer, lenp, ppos, | |
1752 | do_proc_dointvec_minmax_conv, ¶m); | |
1753 | } | |
1754 | ||
fcfbd547 | 1755 | static int __do_proc_doulongvec_minmax(void *data, ctl_table *table, int write, |
1da177e4 LT |
1756 | struct file *filp, |
1757 | void __user *buffer, | |
1758 | size_t *lenp, loff_t *ppos, | |
1759 | unsigned long convmul, | |
1760 | unsigned long convdiv) | |
1761 | { | |
1762 | #define TMPBUFLEN 21 | |
1763 | unsigned long *i, *min, *max, val; | |
1764 | int vleft, first=1, neg; | |
1765 | size_t len, left; | |
1766 | char buf[TMPBUFLEN], *p; | |
1767 | char __user *s = buffer; | |
1768 | ||
fcfbd547 | 1769 | if (!data || !table->maxlen || !*lenp || |
1da177e4 LT |
1770 | (*ppos && !write)) { |
1771 | *lenp = 0; | |
1772 | return 0; | |
1773 | } | |
1774 | ||
fcfbd547 | 1775 | i = (unsigned long *) data; |
1da177e4 LT |
1776 | min = (unsigned long *) table->extra1; |
1777 | max = (unsigned long *) table->extra2; | |
1778 | vleft = table->maxlen / sizeof(unsigned long); | |
1779 | left = *lenp; | |
1780 | ||
1781 | for (; left && vleft--; i++, min++, max++, first=0) { | |
1782 | if (write) { | |
1783 | while (left) { | |
1784 | char c; | |
1785 | if (get_user(c, s)) | |
1786 | return -EFAULT; | |
1787 | if (!isspace(c)) | |
1788 | break; | |
1789 | left--; | |
1790 | s++; | |
1791 | } | |
1792 | if (!left) | |
1793 | break; | |
1794 | neg = 0; | |
1795 | len = left; | |
1796 | if (len > TMPBUFLEN-1) | |
1797 | len = TMPBUFLEN-1; | |
1798 | if (copy_from_user(buf, s, len)) | |
1799 | return -EFAULT; | |
1800 | buf[len] = 0; | |
1801 | p = buf; | |
1802 | if (*p == '-' && left > 1) { | |
1803 | neg = 1; | |
bd9b0bac | 1804 | p++; |
1da177e4 LT |
1805 | } |
1806 | if (*p < '0' || *p > '9') | |
1807 | break; | |
1808 | val = simple_strtoul(p, &p, 0) * convmul / convdiv ; | |
1809 | len = p-buf; | |
1810 | if ((len < left) && *p && !isspace(*p)) | |
1811 | break; | |
1812 | if (neg) | |
1813 | val = -val; | |
1814 | s += len; | |
1815 | left -= len; | |
1816 | ||
1817 | if(neg) | |
1818 | continue; | |
1819 | if ((min && val < *min) || (max && val > *max)) | |
1820 | continue; | |
1821 | *i = val; | |
1822 | } else { | |
1823 | p = buf; | |
1824 | if (!first) | |
1825 | *p++ = '\t'; | |
1826 | sprintf(p, "%lu", convdiv * (*i) / convmul); | |
1827 | len = strlen(buf); | |
1828 | if (len > left) | |
1829 | len = left; | |
1830 | if(copy_to_user(s, buf, len)) | |
1831 | return -EFAULT; | |
1832 | left -= len; | |
1833 | s += len; | |
1834 | } | |
1835 | } | |
1836 | ||
1837 | if (!write && !first && left) { | |
1838 | if(put_user('\n', s)) | |
1839 | return -EFAULT; | |
1840 | left--, s++; | |
1841 | } | |
1842 | if (write) { | |
1843 | while (left) { | |
1844 | char c; | |
1845 | if (get_user(c, s++)) | |
1846 | return -EFAULT; | |
1847 | if (!isspace(c)) | |
1848 | break; | |
1849 | left--; | |
1850 | } | |
1851 | } | |
1852 | if (write && first) | |
1853 | return -EINVAL; | |
1854 | *lenp -= left; | |
1855 | *ppos += *lenp; | |
1856 | return 0; | |
1857 | #undef TMPBUFLEN | |
1858 | } | |
1859 | ||
fcfbd547 KK |
1860 | static int do_proc_doulongvec_minmax(ctl_table *table, int write, |
1861 | struct file *filp, | |
1862 | void __user *buffer, | |
1863 | size_t *lenp, loff_t *ppos, | |
1864 | unsigned long convmul, | |
1865 | unsigned long convdiv) | |
1866 | { | |
1867 | return __do_proc_doulongvec_minmax(table->data, table, write, | |
1868 | filp, buffer, lenp, ppos, convmul, convdiv); | |
1869 | } | |
1870 | ||
1da177e4 LT |
1871 | /** |
1872 | * proc_doulongvec_minmax - read a vector of long integers with min/max values | |
1873 | * @table: the sysctl table | |
1874 | * @write: %TRUE if this is a write to the sysctl file | |
1875 | * @filp: the file structure | |
1876 | * @buffer: the user buffer | |
1877 | * @lenp: the size of the user buffer | |
1878 | * @ppos: file position | |
1879 | * | |
1880 | * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long | |
1881 | * values from/to the user buffer, treated as an ASCII string. | |
1882 | * | |
1883 | * This routine will ensure the values are within the range specified by | |
1884 | * table->extra1 (min) and table->extra2 (max). | |
1885 | * | |
1886 | * Returns 0 on success. | |
1887 | */ | |
1888 | int proc_doulongvec_minmax(ctl_table *table, int write, struct file *filp, | |
1889 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
1890 | { | |
1891 | return do_proc_doulongvec_minmax(table, write, filp, buffer, lenp, ppos, 1l, 1l); | |
1892 | } | |
1893 | ||
1894 | /** | |
1895 | * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values | |
1896 | * @table: the sysctl table | |
1897 | * @write: %TRUE if this is a write to the sysctl file | |
1898 | * @filp: the file structure | |
1899 | * @buffer: the user buffer | |
1900 | * @lenp: the size of the user buffer | |
1901 | * @ppos: file position | |
1902 | * | |
1903 | * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long | |
1904 | * values from/to the user buffer, treated as an ASCII string. The values | |
1905 | * are treated as milliseconds, and converted to jiffies when they are stored. | |
1906 | * | |
1907 | * This routine will ensure the values are within the range specified by | |
1908 | * table->extra1 (min) and table->extra2 (max). | |
1909 | * | |
1910 | * Returns 0 on success. | |
1911 | */ | |
1912 | int proc_doulongvec_ms_jiffies_minmax(ctl_table *table, int write, | |
1913 | struct file *filp, | |
1914 | void __user *buffer, | |
1915 | size_t *lenp, loff_t *ppos) | |
1916 | { | |
1917 | return do_proc_doulongvec_minmax(table, write, filp, buffer, | |
1918 | lenp, ppos, HZ, 1000l); | |
1919 | } | |
1920 | ||
1921 | ||
1922 | static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp, | |
1923 | int *valp, | |
1924 | int write, void *data) | |
1925 | { | |
1926 | if (write) { | |
cba9f33d BS |
1927 | if (*lvalp > LONG_MAX / HZ) |
1928 | return 1; | |
1da177e4 LT |
1929 | *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ); |
1930 | } else { | |
1931 | int val = *valp; | |
1932 | unsigned long lval; | |
1933 | if (val < 0) { | |
1934 | *negp = -1; | |
1935 | lval = (unsigned long)-val; | |
1936 | } else { | |
1937 | *negp = 0; | |
1938 | lval = (unsigned long)val; | |
1939 | } | |
1940 | *lvalp = lval / HZ; | |
1941 | } | |
1942 | return 0; | |
1943 | } | |
1944 | ||
1945 | static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp, | |
1946 | int *valp, | |
1947 | int write, void *data) | |
1948 | { | |
1949 | if (write) { | |
cba9f33d BS |
1950 | if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ) |
1951 | return 1; | |
1da177e4 LT |
1952 | *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp); |
1953 | } else { | |
1954 | int val = *valp; | |
1955 | unsigned long lval; | |
1956 | if (val < 0) { | |
1957 | *negp = -1; | |
1958 | lval = (unsigned long)-val; | |
1959 | } else { | |
1960 | *negp = 0; | |
1961 | lval = (unsigned long)val; | |
1962 | } | |
1963 | *lvalp = jiffies_to_clock_t(lval); | |
1964 | } | |
1965 | return 0; | |
1966 | } | |
1967 | ||
1968 | static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp, | |
1969 | int *valp, | |
1970 | int write, void *data) | |
1971 | { | |
1972 | if (write) { | |
1973 | *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp); | |
1974 | } else { | |
1975 | int val = *valp; | |
1976 | unsigned long lval; | |
1977 | if (val < 0) { | |
1978 | *negp = -1; | |
1979 | lval = (unsigned long)-val; | |
1980 | } else { | |
1981 | *negp = 0; | |
1982 | lval = (unsigned long)val; | |
1983 | } | |
1984 | *lvalp = jiffies_to_msecs(lval); | |
1985 | } | |
1986 | return 0; | |
1987 | } | |
1988 | ||
1989 | /** | |
1990 | * proc_dointvec_jiffies - read a vector of integers as seconds | |
1991 | * @table: the sysctl table | |
1992 | * @write: %TRUE if this is a write to the sysctl file | |
1993 | * @filp: the file structure | |
1994 | * @buffer: the user buffer | |
1995 | * @lenp: the size of the user buffer | |
1996 | * @ppos: file position | |
1997 | * | |
1998 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer | |
1999 | * values from/to the user buffer, treated as an ASCII string. | |
2000 | * The values read are assumed to be in seconds, and are converted into | |
2001 | * jiffies. | |
2002 | * | |
2003 | * Returns 0 on success. | |
2004 | */ | |
2005 | int proc_dointvec_jiffies(ctl_table *table, int write, struct file *filp, | |
2006 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2007 | { | |
2008 | return do_proc_dointvec(table,write,filp,buffer,lenp,ppos, | |
2009 | do_proc_dointvec_jiffies_conv,NULL); | |
2010 | } | |
2011 | ||
2012 | /** | |
2013 | * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds | |
2014 | * @table: the sysctl table | |
2015 | * @write: %TRUE if this is a write to the sysctl file | |
2016 | * @filp: the file structure | |
2017 | * @buffer: the user buffer | |
2018 | * @lenp: the size of the user buffer | |
1e5d5331 | 2019 | * @ppos: pointer to the file position |
1da177e4 LT |
2020 | * |
2021 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer | |
2022 | * values from/to the user buffer, treated as an ASCII string. | |
2023 | * The values read are assumed to be in 1/USER_HZ seconds, and | |
2024 | * are converted into jiffies. | |
2025 | * | |
2026 | * Returns 0 on success. | |
2027 | */ | |
2028 | int proc_dointvec_userhz_jiffies(ctl_table *table, int write, struct file *filp, | |
2029 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2030 | { | |
2031 | return do_proc_dointvec(table,write,filp,buffer,lenp,ppos, | |
2032 | do_proc_dointvec_userhz_jiffies_conv,NULL); | |
2033 | } | |
2034 | ||
2035 | /** | |
2036 | * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds | |
2037 | * @table: the sysctl table | |
2038 | * @write: %TRUE if this is a write to the sysctl file | |
2039 | * @filp: the file structure | |
2040 | * @buffer: the user buffer | |
2041 | * @lenp: the size of the user buffer | |
67be2dd1 MW |
2042 | * @ppos: file position |
2043 | * @ppos: the current position in the file | |
1da177e4 LT |
2044 | * |
2045 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer | |
2046 | * values from/to the user buffer, treated as an ASCII string. | |
2047 | * The values read are assumed to be in 1/1000 seconds, and | |
2048 | * are converted into jiffies. | |
2049 | * | |
2050 | * Returns 0 on success. | |
2051 | */ | |
2052 | int proc_dointvec_ms_jiffies(ctl_table *table, int write, struct file *filp, | |
2053 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2054 | { | |
2055 | return do_proc_dointvec(table, write, filp, buffer, lenp, ppos, | |
2056 | do_proc_dointvec_ms_jiffies_conv, NULL); | |
2057 | } | |
2058 | ||
9ec52099 CLG |
2059 | static int proc_do_cad_pid(ctl_table *table, int write, struct file *filp, |
2060 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2061 | { | |
2062 | struct pid *new_pid; | |
2063 | pid_t tmp; | |
2064 | int r; | |
2065 | ||
2066 | tmp = pid_nr(cad_pid); | |
2067 | ||
2068 | r = __do_proc_dointvec(&tmp, table, write, filp, buffer, | |
2069 | lenp, ppos, NULL, NULL); | |
2070 | if (r || !write) | |
2071 | return r; | |
2072 | ||
2073 | new_pid = find_get_pid(tmp); | |
2074 | if (!new_pid) | |
2075 | return -ESRCH; | |
2076 | ||
2077 | put_pid(xchg(&cad_pid, new_pid)); | |
2078 | return 0; | |
2079 | } | |
2080 | ||
1da177e4 LT |
2081 | #else /* CONFIG_PROC_FS */ |
2082 | ||
2083 | int proc_dostring(ctl_table *table, int write, struct file *filp, | |
2084 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2085 | { | |
2086 | return -ENOSYS; | |
2087 | } | |
2088 | ||
1da177e4 LT |
2089 | int proc_dointvec(ctl_table *table, int write, struct file *filp, |
2090 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2091 | { | |
2092 | return -ENOSYS; | |
2093 | } | |
2094 | ||
2095 | int proc_dointvec_bset(ctl_table *table, int write, struct file *filp, | |
2096 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2097 | { | |
2098 | return -ENOSYS; | |
2099 | } | |
2100 | ||
2101 | int proc_dointvec_minmax(ctl_table *table, int write, struct file *filp, | |
2102 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2103 | { | |
2104 | return -ENOSYS; | |
2105 | } | |
2106 | ||
2107 | int proc_dointvec_jiffies(ctl_table *table, int write, struct file *filp, | |
2108 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2109 | { | |
2110 | return -ENOSYS; | |
2111 | } | |
2112 | ||
2113 | int proc_dointvec_userhz_jiffies(ctl_table *table, int write, struct file *filp, | |
2114 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2115 | { | |
2116 | return -ENOSYS; | |
2117 | } | |
2118 | ||
2119 | int proc_dointvec_ms_jiffies(ctl_table *table, int write, struct file *filp, | |
2120 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2121 | { | |
2122 | return -ENOSYS; | |
2123 | } | |
2124 | ||
2125 | int proc_doulongvec_minmax(ctl_table *table, int write, struct file *filp, | |
2126 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2127 | { | |
2128 | return -ENOSYS; | |
2129 | } | |
2130 | ||
2131 | int proc_doulongvec_ms_jiffies_minmax(ctl_table *table, int write, | |
2132 | struct file *filp, | |
2133 | void __user *buffer, | |
2134 | size_t *lenp, loff_t *ppos) | |
2135 | { | |
2136 | return -ENOSYS; | |
2137 | } | |
2138 | ||
2139 | ||
2140 | #endif /* CONFIG_PROC_FS */ | |
2141 | ||
2142 | ||
b89a8171 | 2143 | #ifdef CONFIG_SYSCTL_SYSCALL |
1da177e4 LT |
2144 | /* |
2145 | * General sysctl support routines | |
2146 | */ | |
2147 | ||
2148 | /* The generic string strategy routine: */ | |
2149 | int sysctl_string(ctl_table *table, int __user *name, int nlen, | |
2150 | void __user *oldval, size_t __user *oldlenp, | |
1f29bcd7 | 2151 | void __user *newval, size_t newlen) |
1da177e4 | 2152 | { |
1da177e4 LT |
2153 | if (!table->data || !table->maxlen) |
2154 | return -ENOTDIR; | |
2155 | ||
2156 | if (oldval && oldlenp) { | |
de9e007d LT |
2157 | size_t bufsize; |
2158 | if (get_user(bufsize, oldlenp)) | |
1da177e4 | 2159 | return -EFAULT; |
de9e007d LT |
2160 | if (bufsize) { |
2161 | size_t len = strlen(table->data), copied; | |
2162 | ||
2163 | /* This shouldn't trigger for a well-formed sysctl */ | |
2164 | if (len > table->maxlen) | |
1da177e4 | 2165 | len = table->maxlen; |
de9e007d LT |
2166 | |
2167 | /* Copy up to a max of bufsize-1 bytes of the string */ | |
2168 | copied = (len >= bufsize) ? bufsize - 1 : len; | |
2169 | ||
2170 | if (copy_to_user(oldval, table->data, copied) || | |
2171 | put_user(0, (char __user *)(oldval + copied))) | |
1da177e4 | 2172 | return -EFAULT; |
de9e007d | 2173 | if (put_user(len, oldlenp)) |
1da177e4 LT |
2174 | return -EFAULT; |
2175 | } | |
2176 | } | |
2177 | if (newval && newlen) { | |
de9e007d | 2178 | size_t len = newlen; |
1da177e4 LT |
2179 | if (len > table->maxlen) |
2180 | len = table->maxlen; | |
2181 | if(copy_from_user(table->data, newval, len)) | |
2182 | return -EFAULT; | |
2183 | if (len == table->maxlen) | |
2184 | len--; | |
2185 | ((char *) table->data)[len] = 0; | |
2186 | } | |
82c9df82 | 2187 | return 1; |
1da177e4 LT |
2188 | } |
2189 | ||
2190 | /* | |
2191 | * This function makes sure that all of the integers in the vector | |
2192 | * are between the minimum and maximum values given in the arrays | |
2193 | * table->extra1 and table->extra2, respectively. | |
2194 | */ | |
2195 | int sysctl_intvec(ctl_table *table, int __user *name, int nlen, | |
2196 | void __user *oldval, size_t __user *oldlenp, | |
1f29bcd7 | 2197 | void __user *newval, size_t newlen) |
1da177e4 LT |
2198 | { |
2199 | ||
2200 | if (newval && newlen) { | |
2201 | int __user *vec = (int __user *) newval; | |
2202 | int *min = (int *) table->extra1; | |
2203 | int *max = (int *) table->extra2; | |
2204 | size_t length; | |
2205 | int i; | |
2206 | ||
2207 | if (newlen % sizeof(int) != 0) | |
2208 | return -EINVAL; | |
2209 | ||
2210 | if (!table->extra1 && !table->extra2) | |
2211 | return 0; | |
2212 | ||
2213 | if (newlen > table->maxlen) | |
2214 | newlen = table->maxlen; | |
2215 | length = newlen / sizeof(int); | |
2216 | ||
2217 | for (i = 0; i < length; i++) { | |
2218 | int value; | |
2219 | if (get_user(value, vec + i)) | |
2220 | return -EFAULT; | |
2221 | if (min && value < min[i]) | |
2222 | return -EINVAL; | |
2223 | if (max && value > max[i]) | |
2224 | return -EINVAL; | |
2225 | } | |
2226 | } | |
2227 | return 0; | |
2228 | } | |
2229 | ||
2230 | /* Strategy function to convert jiffies to seconds */ | |
2231 | int sysctl_jiffies(ctl_table *table, int __user *name, int nlen, | |
2232 | void __user *oldval, size_t __user *oldlenp, | |
1f29bcd7 | 2233 | void __user *newval, size_t newlen) |
1da177e4 | 2234 | { |
3ee75ac3 | 2235 | if (oldval && oldlenp) { |
1da177e4 | 2236 | size_t olen; |
3ee75ac3 AD |
2237 | |
2238 | if (get_user(olen, oldlenp)) | |
2239 | return -EFAULT; | |
2240 | if (olen) { | |
2241 | int val; | |
2242 | ||
2243 | if (olen < sizeof(int)) | |
2244 | return -EINVAL; | |
2245 | ||
2246 | val = *(int *)(table->data) / HZ; | |
2247 | if (put_user(val, (int __user *)oldval)) | |
2248 | return -EFAULT; | |
2249 | if (put_user(sizeof(int), oldlenp)) | |
1da177e4 | 2250 | return -EFAULT; |
1da177e4 | 2251 | } |
1da177e4 LT |
2252 | } |
2253 | if (newval && newlen) { | |
2254 | int new; | |
2255 | if (newlen != sizeof(int)) | |
2256 | return -EINVAL; | |
2257 | if (get_user(new, (int __user *)newval)) | |
2258 | return -EFAULT; | |
2259 | *(int *)(table->data) = new*HZ; | |
2260 | } | |
2261 | return 1; | |
2262 | } | |
2263 | ||
2264 | /* Strategy function to convert jiffies to seconds */ | |
2265 | int sysctl_ms_jiffies(ctl_table *table, int __user *name, int nlen, | |
2266 | void __user *oldval, size_t __user *oldlenp, | |
1f29bcd7 | 2267 | void __user *newval, size_t newlen) |
1da177e4 | 2268 | { |
3ee75ac3 | 2269 | if (oldval && oldlenp) { |
1da177e4 | 2270 | size_t olen; |
3ee75ac3 AD |
2271 | |
2272 | if (get_user(olen, oldlenp)) | |
2273 | return -EFAULT; | |
2274 | if (olen) { | |
2275 | int val; | |
2276 | ||
2277 | if (olen < sizeof(int)) | |
2278 | return -EINVAL; | |
2279 | ||
2280 | val = jiffies_to_msecs(*(int *)(table->data)); | |
2281 | if (put_user(val, (int __user *)oldval)) | |
2282 | return -EFAULT; | |
2283 | if (put_user(sizeof(int), oldlenp)) | |
1da177e4 | 2284 | return -EFAULT; |
1da177e4 | 2285 | } |
1da177e4 LT |
2286 | } |
2287 | if (newval && newlen) { | |
2288 | int new; | |
2289 | if (newlen != sizeof(int)) | |
2290 | return -EINVAL; | |
2291 | if (get_user(new, (int __user *)newval)) | |
2292 | return -EFAULT; | |
2293 | *(int *)(table->data) = msecs_to_jiffies(new); | |
2294 | } | |
2295 | return 1; | |
2296 | } | |
2297 | ||
c4b8b769 | 2298 | |
c4b8b769 | 2299 | |
b89a8171 | 2300 | #else /* CONFIG_SYSCTL_SYSCALL */ |
1da177e4 LT |
2301 | |
2302 | ||
2303 | asmlinkage long sys_sysctl(struct __sysctl_args __user *args) | |
2304 | { | |
b89a8171 | 2305 | static int msg_count; |
0e009be8 EB |
2306 | struct __sysctl_args tmp; |
2307 | int name[CTL_MAXNAME]; | |
2308 | int i; | |
2309 | ||
2310 | /* Read in the sysctl name for better debug message logging */ | |
2311 | if (copy_from_user(&tmp, args, sizeof(tmp))) | |
2312 | return -EFAULT; | |
2313 | if (tmp.nlen <= 0 || tmp.nlen >= CTL_MAXNAME) | |
2314 | return -ENOTDIR; | |
2315 | for (i = 0; i < tmp.nlen; i++) | |
2316 | if (get_user(name[i], tmp.name + i)) | |
2317 | return -EFAULT; | |
2318 | ||
2319 | /* Ignore accesses to kernel.version */ | |
2320 | if ((tmp.nlen == 2) && (name[0] == CTL_KERN) && (name[1] == KERN_VERSION)) | |
2321 | goto out; | |
b89a8171 EB |
2322 | |
2323 | if (msg_count < 5) { | |
2324 | msg_count++; | |
2325 | printk(KERN_INFO | |
2326 | "warning: process `%s' used the removed sysctl " | |
0e009be8 EB |
2327 | "system call with ", current->comm); |
2328 | for (i = 0; i < tmp.nlen; i++) | |
2329 | printk("%d.", name[i]); | |
2330 | printk("\n"); | |
b89a8171 | 2331 | } |
0e009be8 | 2332 | out: |
1da177e4 LT |
2333 | return -ENOSYS; |
2334 | } | |
2335 | ||
2336 | int sysctl_string(ctl_table *table, int __user *name, int nlen, | |
2337 | void __user *oldval, size_t __user *oldlenp, | |
1f29bcd7 | 2338 | void __user *newval, size_t newlen) |
1da177e4 LT |
2339 | { |
2340 | return -ENOSYS; | |
2341 | } | |
2342 | ||
2343 | int sysctl_intvec(ctl_table *table, int __user *name, int nlen, | |
2344 | void __user *oldval, size_t __user *oldlenp, | |
1f29bcd7 | 2345 | void __user *newval, size_t newlen) |
1da177e4 LT |
2346 | { |
2347 | return -ENOSYS; | |
2348 | } | |
2349 | ||
2350 | int sysctl_jiffies(ctl_table *table, int __user *name, int nlen, | |
2351 | void __user *oldval, size_t __user *oldlenp, | |
1f29bcd7 | 2352 | void __user *newval, size_t newlen) |
1da177e4 LT |
2353 | { |
2354 | return -ENOSYS; | |
2355 | } | |
2356 | ||
2357 | int sysctl_ms_jiffies(ctl_table *table, int __user *name, int nlen, | |
2358 | void __user *oldval, size_t __user *oldlenp, | |
1f29bcd7 | 2359 | void __user *newval, size_t newlen) |
1da177e4 LT |
2360 | { |
2361 | return -ENOSYS; | |
2362 | } | |
2363 | ||
b89a8171 | 2364 | #endif /* CONFIG_SYSCTL_SYSCALL */ |
1da177e4 LT |
2365 | |
2366 | /* | |
2367 | * No sense putting this after each symbol definition, twice, | |
2368 | * exception granted :-) | |
2369 | */ | |
2370 | EXPORT_SYMBOL(proc_dointvec); | |
2371 | EXPORT_SYMBOL(proc_dointvec_jiffies); | |
2372 | EXPORT_SYMBOL(proc_dointvec_minmax); | |
2373 | EXPORT_SYMBOL(proc_dointvec_userhz_jiffies); | |
2374 | EXPORT_SYMBOL(proc_dointvec_ms_jiffies); | |
2375 | EXPORT_SYMBOL(proc_dostring); | |
2376 | EXPORT_SYMBOL(proc_doulongvec_minmax); | |
2377 | EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax); | |
2378 | EXPORT_SYMBOL(register_sysctl_table); | |
2379 | EXPORT_SYMBOL(sysctl_intvec); | |
2380 | EXPORT_SYMBOL(sysctl_jiffies); | |
2381 | EXPORT_SYMBOL(sysctl_ms_jiffies); | |
2382 | EXPORT_SYMBOL(sysctl_string); | |
2383 | EXPORT_SYMBOL(unregister_sysctl_table); |