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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 LT |
67 | extern int max_threads; |
68 | extern int sysrq_enabled; | |
69 | extern int core_uses_pid; | |
d6e71144 | 70 | extern int suid_dumpable; |
1da177e4 | 71 | extern char core_pattern[]; |
1da177e4 LT |
72 | extern int pid_max; |
73 | extern int min_free_kbytes; | |
74 | extern int printk_ratelimit_jiffies; | |
75 | extern int printk_ratelimit_burst; | |
76 | extern int pid_max_min, pid_max_max; | |
9d0243bc | 77 | extern int sysctl_drop_caches; |
8ad4b1fb | 78 | extern int percpu_pagelist_fraction; |
bebfa101 | 79 | extern int compat_log; |
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 | |
94 | #ifdef CONFIG_SYSVIPC | |
fcfbd547 KK |
95 | static int proc_do_ipc_string(ctl_table *table, int write, struct file *filp, |
96 | void __user *buffer, size_t *lenp, loff_t *ppos); | |
1da177e4 LT |
97 | #endif |
98 | ||
99 | #ifdef __sparc__ | |
100 | extern char reboot_command []; | |
101 | extern int stop_a_enabled; | |
102 | extern int scons_pwroff; | |
103 | #endif | |
104 | ||
105 | #ifdef __hppa__ | |
106 | extern int pwrsw_enabled; | |
107 | extern int unaligned_enabled; | |
108 | #endif | |
109 | ||
347a8dc3 | 110 | #ifdef CONFIG_S390 |
1da177e4 LT |
111 | #ifdef CONFIG_MATHEMU |
112 | extern int sysctl_ieee_emulation_warnings; | |
113 | #endif | |
114 | extern int sysctl_userprocess_debug; | |
951f22d5 | 115 | extern int spin_retry; |
1da177e4 LT |
116 | #endif |
117 | ||
118 | extern int sysctl_hz_timer; | |
119 | ||
120 | #ifdef CONFIG_BSD_PROCESS_ACCT | |
121 | extern int acct_parm[]; | |
122 | #endif | |
123 | ||
d2b176ed JS |
124 | #ifdef CONFIG_IA64 |
125 | extern int no_unaligned_warning; | |
126 | #endif | |
127 | ||
23f78d4a IM |
128 | #ifdef CONFIG_RT_MUTEXES |
129 | extern int max_lock_depth; | |
130 | #endif | |
131 | ||
b89a8171 EB |
132 | #ifdef CONFIG_SYSCTL_SYSCALL |
133 | static int parse_table(int __user *, int, void __user *, size_t __user *, | |
134 | void __user *, size_t, ctl_table *, void **); | |
135 | #endif | |
136 | ||
8218c74c | 137 | static int proc_do_uts_string(ctl_table *table, int write, struct file *filp, |
1da177e4 LT |
138 | void __user *buffer, size_t *lenp, loff_t *ppos); |
139 | ||
d6f8ff73 | 140 | #ifdef CONFIG_PROC_SYSCTL |
9ec52099 CLG |
141 | static int proc_do_cad_pid(ctl_table *table, int write, struct file *filp, |
142 | void __user *buffer, size_t *lenp, loff_t *ppos); | |
d6f8ff73 | 143 | #endif |
9ec52099 | 144 | |
1da177e4 LT |
145 | static ctl_table root_table[]; |
146 | static struct ctl_table_header root_table_header = | |
147 | { root_table, LIST_HEAD_INIT(root_table_header.ctl_entry) }; | |
148 | ||
149 | static ctl_table kern_table[]; | |
150 | static ctl_table vm_table[]; | |
1da177e4 LT |
151 | static ctl_table fs_table[]; |
152 | static ctl_table debug_table[]; | |
153 | static ctl_table dev_table[]; | |
154 | extern ctl_table random_table[]; | |
155 | #ifdef CONFIG_UNIX98_PTYS | |
156 | extern ctl_table pty_table[]; | |
157 | #endif | |
2d9048e2 | 158 | #ifdef CONFIG_INOTIFY_USER |
0399cb08 RL |
159 | extern ctl_table inotify_table[]; |
160 | #endif | |
1da177e4 LT |
161 | |
162 | #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT | |
163 | int sysctl_legacy_va_layout; | |
164 | #endif | |
165 | ||
166 | /* /proc declarations: */ | |
167 | ||
b89a8171 | 168 | #ifdef CONFIG_PROC_SYSCTL |
1da177e4 LT |
169 | |
170 | static ssize_t proc_readsys(struct file *, char __user *, size_t, loff_t *); | |
171 | static ssize_t proc_writesys(struct file *, const char __user *, size_t, loff_t *); | |
172 | static int proc_opensys(struct inode *, struct file *); | |
173 | ||
15ad7cdc | 174 | const struct file_operations proc_sys_file_operations = { |
1da177e4 LT |
175 | .open = proc_opensys, |
176 | .read = proc_readsys, | |
177 | .write = proc_writesys, | |
178 | }; | |
179 | ||
180 | extern struct proc_dir_entry *proc_sys_root; | |
181 | ||
330d57fb | 182 | static void register_proc_table(ctl_table *, struct proc_dir_entry *, void *); |
1da177e4 LT |
183 | static void unregister_proc_table(ctl_table *, struct proc_dir_entry *); |
184 | #endif | |
185 | ||
186 | /* The default sysctl tables: */ | |
187 | ||
188 | static ctl_table root_table[] = { | |
189 | { | |
190 | .ctl_name = CTL_KERN, | |
191 | .procname = "kernel", | |
192 | .mode = 0555, | |
193 | .child = kern_table, | |
194 | }, | |
195 | { | |
196 | .ctl_name = CTL_VM, | |
197 | .procname = "vm", | |
198 | .mode = 0555, | |
199 | .child = vm_table, | |
200 | }, | |
201 | #ifdef CONFIG_NET | |
202 | { | |
203 | .ctl_name = CTL_NET, | |
204 | .procname = "net", | |
205 | .mode = 0555, | |
206 | .child = net_table, | |
207 | }, | |
208 | #endif | |
1da177e4 LT |
209 | { |
210 | .ctl_name = CTL_FS, | |
211 | .procname = "fs", | |
212 | .mode = 0555, | |
213 | .child = fs_table, | |
214 | }, | |
215 | { | |
216 | .ctl_name = CTL_DEBUG, | |
217 | .procname = "debug", | |
218 | .mode = 0555, | |
219 | .child = debug_table, | |
220 | }, | |
221 | { | |
222 | .ctl_name = CTL_DEV, | |
223 | .procname = "dev", | |
224 | .mode = 0555, | |
225 | .child = dev_table, | |
226 | }, | |
0eeca283 | 227 | |
1da177e4 LT |
228 | { .ctl_name = 0 } |
229 | }; | |
230 | ||
231 | static ctl_table kern_table[] = { | |
8218c74c | 232 | #ifndef CONFIG_UTS_NS |
1da177e4 LT |
233 | { |
234 | .ctl_name = KERN_OSTYPE, | |
235 | .procname = "ostype", | |
8218c74c SH |
236 | .data = init_uts_ns.name.sysname, |
237 | .maxlen = sizeof(init_uts_ns.name.sysname), | |
1da177e4 | 238 | .mode = 0444, |
8218c74c | 239 | .proc_handler = &proc_do_uts_string, |
1da177e4 LT |
240 | .strategy = &sysctl_string, |
241 | }, | |
242 | { | |
243 | .ctl_name = KERN_OSRELEASE, | |
244 | .procname = "osrelease", | |
8218c74c SH |
245 | .data = init_uts_ns.name.release, |
246 | .maxlen = sizeof(init_uts_ns.name.release), | |
1da177e4 | 247 | .mode = 0444, |
8218c74c | 248 | .proc_handler = &proc_do_uts_string, |
1da177e4 LT |
249 | .strategy = &sysctl_string, |
250 | }, | |
251 | { | |
252 | .ctl_name = KERN_VERSION, | |
253 | .procname = "version", | |
8218c74c SH |
254 | .data = init_uts_ns.name.version, |
255 | .maxlen = sizeof(init_uts_ns.name.version), | |
1da177e4 | 256 | .mode = 0444, |
8218c74c | 257 | .proc_handler = &proc_do_uts_string, |
1da177e4 LT |
258 | .strategy = &sysctl_string, |
259 | }, | |
260 | { | |
261 | .ctl_name = KERN_NODENAME, | |
262 | .procname = "hostname", | |
8218c74c SH |
263 | .data = init_uts_ns.name.nodename, |
264 | .maxlen = sizeof(init_uts_ns.name.nodename), | |
1da177e4 | 265 | .mode = 0644, |
8218c74c | 266 | .proc_handler = &proc_do_uts_string, |
1da177e4 LT |
267 | .strategy = &sysctl_string, |
268 | }, | |
269 | { | |
270 | .ctl_name = KERN_DOMAINNAME, | |
271 | .procname = "domainname", | |
8218c74c SH |
272 | .data = init_uts_ns.name.domainname, |
273 | .maxlen = sizeof(init_uts_ns.name.domainname), | |
1da177e4 | 274 | .mode = 0644, |
8218c74c | 275 | .proc_handler = &proc_do_uts_string, |
1da177e4 LT |
276 | .strategy = &sysctl_string, |
277 | }, | |
8218c74c SH |
278 | #else /* !CONFIG_UTS_NS */ |
279 | { | |
280 | .ctl_name = KERN_OSTYPE, | |
281 | .procname = "ostype", | |
282 | .data = NULL, | |
283 | /* could maybe use __NEW_UTS_LEN here? */ | |
284 | .maxlen = FIELD_SIZEOF(struct new_utsname, sysname), | |
285 | .mode = 0444, | |
286 | .proc_handler = &proc_do_uts_string, | |
287 | .strategy = &sysctl_string, | |
288 | }, | |
289 | { | |
290 | .ctl_name = KERN_OSRELEASE, | |
291 | .procname = "osrelease", | |
292 | .data = NULL, | |
293 | .maxlen = FIELD_SIZEOF(struct new_utsname, release), | |
294 | .mode = 0444, | |
295 | .proc_handler = &proc_do_uts_string, | |
296 | .strategy = &sysctl_string, | |
297 | }, | |
298 | { | |
299 | .ctl_name = KERN_VERSION, | |
300 | .procname = "version", | |
301 | .data = NULL, | |
302 | .maxlen = FIELD_SIZEOF(struct new_utsname, version), | |
303 | .mode = 0444, | |
304 | .proc_handler = &proc_do_uts_string, | |
305 | .strategy = &sysctl_string, | |
306 | }, | |
307 | { | |
308 | .ctl_name = KERN_NODENAME, | |
309 | .procname = "hostname", | |
310 | .data = NULL, | |
311 | .maxlen = FIELD_SIZEOF(struct new_utsname, nodename), | |
312 | .mode = 0644, | |
313 | .proc_handler = &proc_do_uts_string, | |
314 | .strategy = &sysctl_string, | |
315 | }, | |
316 | { | |
317 | .ctl_name = KERN_DOMAINNAME, | |
318 | .procname = "domainname", | |
319 | .data = NULL, | |
320 | .maxlen = FIELD_SIZEOF(struct new_utsname, domainname), | |
321 | .mode = 0644, | |
322 | .proc_handler = &proc_do_uts_string, | |
323 | .strategy = &sysctl_string, | |
324 | }, | |
325 | #endif /* !CONFIG_UTS_NS */ | |
1da177e4 LT |
326 | { |
327 | .ctl_name = KERN_PANIC, | |
328 | .procname = "panic", | |
329 | .data = &panic_timeout, | |
330 | .maxlen = sizeof(int), | |
331 | .mode = 0644, | |
332 | .proc_handler = &proc_dointvec, | |
333 | }, | |
334 | { | |
335 | .ctl_name = KERN_CORE_USES_PID, | |
336 | .procname = "core_uses_pid", | |
337 | .data = &core_uses_pid, | |
338 | .maxlen = sizeof(int), | |
339 | .mode = 0644, | |
340 | .proc_handler = &proc_dointvec, | |
341 | }, | |
342 | { | |
343 | .ctl_name = KERN_CORE_PATTERN, | |
344 | .procname = "core_pattern", | |
345 | .data = core_pattern, | |
d025c9db | 346 | .maxlen = 128, |
1da177e4 LT |
347 | .mode = 0644, |
348 | .proc_handler = &proc_dostring, | |
349 | .strategy = &sysctl_string, | |
350 | }, | |
351 | { | |
352 | .ctl_name = KERN_TAINTED, | |
353 | .procname = "tainted", | |
354 | .data = &tainted, | |
355 | .maxlen = sizeof(int), | |
356 | .mode = 0444, | |
357 | .proc_handler = &proc_dointvec, | |
358 | }, | |
359 | { | |
360 | .ctl_name = KERN_CAP_BSET, | |
361 | .procname = "cap-bound", | |
362 | .data = &cap_bset, | |
363 | .maxlen = sizeof(kernel_cap_t), | |
364 | .mode = 0600, | |
365 | .proc_handler = &proc_dointvec_bset, | |
366 | }, | |
367 | #ifdef CONFIG_BLK_DEV_INITRD | |
368 | { | |
369 | .ctl_name = KERN_REALROOTDEV, | |
370 | .procname = "real-root-dev", | |
371 | .data = &real_root_dev, | |
372 | .maxlen = sizeof(int), | |
373 | .mode = 0644, | |
374 | .proc_handler = &proc_dointvec, | |
375 | }, | |
376 | #endif | |
377 | #ifdef __sparc__ | |
378 | { | |
379 | .ctl_name = KERN_SPARC_REBOOT, | |
380 | .procname = "reboot-cmd", | |
381 | .data = reboot_command, | |
382 | .maxlen = 256, | |
383 | .mode = 0644, | |
384 | .proc_handler = &proc_dostring, | |
385 | .strategy = &sysctl_string, | |
386 | }, | |
387 | { | |
388 | .ctl_name = KERN_SPARC_STOP_A, | |
389 | .procname = "stop-a", | |
390 | .data = &stop_a_enabled, | |
391 | .maxlen = sizeof (int), | |
392 | .mode = 0644, | |
393 | .proc_handler = &proc_dointvec, | |
394 | }, | |
395 | { | |
396 | .ctl_name = KERN_SPARC_SCONS_PWROFF, | |
397 | .procname = "scons-poweroff", | |
398 | .data = &scons_pwroff, | |
399 | .maxlen = sizeof (int), | |
400 | .mode = 0644, | |
401 | .proc_handler = &proc_dointvec, | |
402 | }, | |
403 | #endif | |
404 | #ifdef __hppa__ | |
405 | { | |
406 | .ctl_name = KERN_HPPA_PWRSW, | |
407 | .procname = "soft-power", | |
408 | .data = &pwrsw_enabled, | |
409 | .maxlen = sizeof (int), | |
410 | .mode = 0644, | |
411 | .proc_handler = &proc_dointvec, | |
412 | }, | |
413 | { | |
414 | .ctl_name = KERN_HPPA_UNALIGNED, | |
415 | .procname = "unaligned-trap", | |
416 | .data = &unaligned_enabled, | |
417 | .maxlen = sizeof (int), | |
418 | .mode = 0644, | |
419 | .proc_handler = &proc_dointvec, | |
420 | }, | |
421 | #endif | |
422 | { | |
423 | .ctl_name = KERN_CTLALTDEL, | |
424 | .procname = "ctrl-alt-del", | |
425 | .data = &C_A_D, | |
426 | .maxlen = sizeof(int), | |
427 | .mode = 0644, | |
428 | .proc_handler = &proc_dointvec, | |
429 | }, | |
430 | { | |
431 | .ctl_name = KERN_PRINTK, | |
432 | .procname = "printk", | |
433 | .data = &console_loglevel, | |
434 | .maxlen = 4*sizeof(int), | |
435 | .mode = 0644, | |
436 | .proc_handler = &proc_dointvec, | |
437 | }, | |
438 | #ifdef CONFIG_KMOD | |
439 | { | |
440 | .ctl_name = KERN_MODPROBE, | |
441 | .procname = "modprobe", | |
442 | .data = &modprobe_path, | |
443 | .maxlen = KMOD_PATH_LEN, | |
444 | .mode = 0644, | |
445 | .proc_handler = &proc_dostring, | |
446 | .strategy = &sysctl_string, | |
447 | }, | |
448 | #endif | |
57ae2508 | 449 | #if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET) |
1da177e4 LT |
450 | { |
451 | .ctl_name = KERN_HOTPLUG, | |
452 | .procname = "hotplug", | |
312c004d KS |
453 | .data = &uevent_helper, |
454 | .maxlen = UEVENT_HELPER_PATH_LEN, | |
1da177e4 LT |
455 | .mode = 0644, |
456 | .proc_handler = &proc_dostring, | |
457 | .strategy = &sysctl_string, | |
458 | }, | |
459 | #endif | |
460 | #ifdef CONFIG_CHR_DEV_SG | |
461 | { | |
462 | .ctl_name = KERN_SG_BIG_BUFF, | |
463 | .procname = "sg-big-buff", | |
464 | .data = &sg_big_buff, | |
465 | .maxlen = sizeof (int), | |
466 | .mode = 0444, | |
467 | .proc_handler = &proc_dointvec, | |
468 | }, | |
469 | #endif | |
470 | #ifdef CONFIG_BSD_PROCESS_ACCT | |
471 | { | |
472 | .ctl_name = KERN_ACCT, | |
473 | .procname = "acct", | |
474 | .data = &acct_parm, | |
475 | .maxlen = 3*sizeof(int), | |
476 | .mode = 0644, | |
477 | .proc_handler = &proc_dointvec, | |
478 | }, | |
479 | #endif | |
480 | #ifdef CONFIG_SYSVIPC | |
481 | { | |
482 | .ctl_name = KERN_SHMMAX, | |
483 | .procname = "shmmax", | |
fcfbd547 | 484 | .data = NULL, |
1da177e4 LT |
485 | .maxlen = sizeof (size_t), |
486 | .mode = 0644, | |
fcfbd547 | 487 | .proc_handler = &proc_do_ipc_string, |
1da177e4 LT |
488 | }, |
489 | { | |
490 | .ctl_name = KERN_SHMALL, | |
491 | .procname = "shmall", | |
fcfbd547 | 492 | .data = NULL, |
1da177e4 LT |
493 | .maxlen = sizeof (size_t), |
494 | .mode = 0644, | |
fcfbd547 | 495 | .proc_handler = &proc_do_ipc_string, |
1da177e4 LT |
496 | }, |
497 | { | |
498 | .ctl_name = KERN_SHMMNI, | |
499 | .procname = "shmmni", | |
fcfbd547 | 500 | .data = NULL, |
1da177e4 LT |
501 | .maxlen = sizeof (int), |
502 | .mode = 0644, | |
fcfbd547 | 503 | .proc_handler = &proc_do_ipc_string, |
1da177e4 LT |
504 | }, |
505 | { | |
506 | .ctl_name = KERN_MSGMAX, | |
507 | .procname = "msgmax", | |
fcfbd547 | 508 | .data = NULL, |
1da177e4 LT |
509 | .maxlen = sizeof (int), |
510 | .mode = 0644, | |
fcfbd547 | 511 | .proc_handler = &proc_do_ipc_string, |
1da177e4 LT |
512 | }, |
513 | { | |
514 | .ctl_name = KERN_MSGMNI, | |
515 | .procname = "msgmni", | |
fcfbd547 | 516 | .data = NULL, |
1da177e4 LT |
517 | .maxlen = sizeof (int), |
518 | .mode = 0644, | |
fcfbd547 | 519 | .proc_handler = &proc_do_ipc_string, |
1da177e4 LT |
520 | }, |
521 | { | |
522 | .ctl_name = KERN_MSGMNB, | |
523 | .procname = "msgmnb", | |
fcfbd547 | 524 | .data = NULL, |
1da177e4 LT |
525 | .maxlen = sizeof (int), |
526 | .mode = 0644, | |
fcfbd547 | 527 | .proc_handler = &proc_do_ipc_string, |
1da177e4 LT |
528 | }, |
529 | { | |
530 | .ctl_name = KERN_SEM, | |
531 | .procname = "sem", | |
fcfbd547 | 532 | .data = NULL, |
1da177e4 LT |
533 | .maxlen = 4*sizeof (int), |
534 | .mode = 0644, | |
fcfbd547 | 535 | .proc_handler = &proc_do_ipc_string, |
1da177e4 LT |
536 | }, |
537 | #endif | |
538 | #ifdef CONFIG_MAGIC_SYSRQ | |
539 | { | |
540 | .ctl_name = KERN_SYSRQ, | |
541 | .procname = "sysrq", | |
542 | .data = &sysrq_enabled, | |
543 | .maxlen = sizeof (int), | |
544 | .mode = 0644, | |
545 | .proc_handler = &proc_dointvec, | |
546 | }, | |
547 | #endif | |
d6f8ff73 | 548 | #ifdef CONFIG_PROC_SYSCTL |
1da177e4 LT |
549 | { |
550 | .ctl_name = KERN_CADPID, | |
551 | .procname = "cad_pid", | |
9ec52099 | 552 | .data = NULL, |
1da177e4 LT |
553 | .maxlen = sizeof (int), |
554 | .mode = 0600, | |
9ec52099 | 555 | .proc_handler = &proc_do_cad_pid, |
1da177e4 | 556 | }, |
d6f8ff73 | 557 | #endif |
1da177e4 LT |
558 | { |
559 | .ctl_name = KERN_MAX_THREADS, | |
560 | .procname = "threads-max", | |
561 | .data = &max_threads, | |
562 | .maxlen = sizeof(int), | |
563 | .mode = 0644, | |
564 | .proc_handler = &proc_dointvec, | |
565 | }, | |
566 | { | |
567 | .ctl_name = KERN_RANDOM, | |
568 | .procname = "random", | |
569 | .mode = 0555, | |
570 | .child = random_table, | |
571 | }, | |
572 | #ifdef CONFIG_UNIX98_PTYS | |
573 | { | |
574 | .ctl_name = KERN_PTY, | |
575 | .procname = "pty", | |
576 | .mode = 0555, | |
577 | .child = pty_table, | |
578 | }, | |
579 | #endif | |
580 | { | |
581 | .ctl_name = KERN_OVERFLOWUID, | |
582 | .procname = "overflowuid", | |
583 | .data = &overflowuid, | |
584 | .maxlen = sizeof(int), | |
585 | .mode = 0644, | |
586 | .proc_handler = &proc_dointvec_minmax, | |
587 | .strategy = &sysctl_intvec, | |
588 | .extra1 = &minolduid, | |
589 | .extra2 = &maxolduid, | |
590 | }, | |
591 | { | |
592 | .ctl_name = KERN_OVERFLOWGID, | |
593 | .procname = "overflowgid", | |
594 | .data = &overflowgid, | |
595 | .maxlen = sizeof(int), | |
596 | .mode = 0644, | |
597 | .proc_handler = &proc_dointvec_minmax, | |
598 | .strategy = &sysctl_intvec, | |
599 | .extra1 = &minolduid, | |
600 | .extra2 = &maxolduid, | |
601 | }, | |
347a8dc3 | 602 | #ifdef CONFIG_S390 |
1da177e4 LT |
603 | #ifdef CONFIG_MATHEMU |
604 | { | |
605 | .ctl_name = KERN_IEEE_EMULATION_WARNINGS, | |
606 | .procname = "ieee_emulation_warnings", | |
607 | .data = &sysctl_ieee_emulation_warnings, | |
608 | .maxlen = sizeof(int), | |
609 | .mode = 0644, | |
610 | .proc_handler = &proc_dointvec, | |
611 | }, | |
612 | #endif | |
613 | #ifdef CONFIG_NO_IDLE_HZ | |
614 | { | |
615 | .ctl_name = KERN_HZ_TIMER, | |
616 | .procname = "hz_timer", | |
617 | .data = &sysctl_hz_timer, | |
618 | .maxlen = sizeof(int), | |
619 | .mode = 0644, | |
620 | .proc_handler = &proc_dointvec, | |
621 | }, | |
622 | #endif | |
623 | { | |
624 | .ctl_name = KERN_S390_USER_DEBUG_LOGGING, | |
625 | .procname = "userprocess_debug", | |
626 | .data = &sysctl_userprocess_debug, | |
627 | .maxlen = sizeof(int), | |
628 | .mode = 0644, | |
629 | .proc_handler = &proc_dointvec, | |
630 | }, | |
631 | #endif | |
632 | { | |
633 | .ctl_name = KERN_PIDMAX, | |
634 | .procname = "pid_max", | |
635 | .data = &pid_max, | |
636 | .maxlen = sizeof (int), | |
637 | .mode = 0644, | |
638 | .proc_handler = &proc_dointvec_minmax, | |
639 | .strategy = sysctl_intvec, | |
640 | .extra1 = &pid_max_min, | |
641 | .extra2 = &pid_max_max, | |
642 | }, | |
643 | { | |
644 | .ctl_name = KERN_PANIC_ON_OOPS, | |
645 | .procname = "panic_on_oops", | |
646 | .data = &panic_on_oops, | |
647 | .maxlen = sizeof(int), | |
648 | .mode = 0644, | |
649 | .proc_handler = &proc_dointvec, | |
650 | }, | |
651 | { | |
652 | .ctl_name = KERN_PRINTK_RATELIMIT, | |
653 | .procname = "printk_ratelimit", | |
654 | .data = &printk_ratelimit_jiffies, | |
655 | .maxlen = sizeof(int), | |
656 | .mode = 0644, | |
657 | .proc_handler = &proc_dointvec_jiffies, | |
658 | .strategy = &sysctl_jiffies, | |
659 | }, | |
660 | { | |
661 | .ctl_name = KERN_PRINTK_RATELIMIT_BURST, | |
662 | .procname = "printk_ratelimit_burst", | |
663 | .data = &printk_ratelimit_burst, | |
664 | .maxlen = sizeof(int), | |
665 | .mode = 0644, | |
666 | .proc_handler = &proc_dointvec, | |
667 | }, | |
668 | { | |
669 | .ctl_name = KERN_NGROUPS_MAX, | |
670 | .procname = "ngroups_max", | |
671 | .data = &ngroups_max, | |
672 | .maxlen = sizeof (int), | |
673 | .mode = 0444, | |
674 | .proc_handler = &proc_dointvec, | |
675 | }, | |
676 | #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86) | |
677 | { | |
678 | .ctl_name = KERN_UNKNOWN_NMI_PANIC, | |
679 | .procname = "unknown_nmi_panic", | |
680 | .data = &unknown_nmi_panic, | |
681 | .maxlen = sizeof (int), | |
682 | .mode = 0644, | |
2fbe7b25 | 683 | .proc_handler = &proc_dointvec, |
1da177e4 | 684 | }, |
407984f1 DZ |
685 | { |
686 | .ctl_name = KERN_NMI_WATCHDOG, | |
687 | .procname = "nmi_watchdog", | |
688 | .data = &nmi_watchdog_enabled, | |
689 | .maxlen = sizeof (int), | |
690 | .mode = 0644, | |
691 | .proc_handler = &proc_nmi_enabled, | |
1da177e4 LT |
692 | }, |
693 | #endif | |
694 | #if defined(CONFIG_X86) | |
8da5adda DZ |
695 | { |
696 | .ctl_name = KERN_PANIC_ON_NMI, | |
697 | .procname = "panic_on_unrecovered_nmi", | |
698 | .data = &panic_on_unrecovered_nmi, | |
699 | .maxlen = sizeof(int), | |
700 | .mode = 0644, | |
701 | .proc_handler = &proc_dointvec, | |
702 | }, | |
1da177e4 LT |
703 | { |
704 | .ctl_name = KERN_BOOTLOADER_TYPE, | |
705 | .procname = "bootloader_type", | |
706 | .data = &bootloader_type, | |
707 | .maxlen = sizeof (int), | |
708 | .mode = 0444, | |
709 | .proc_handler = &proc_dointvec, | |
710 | }, | |
0741f4d2 CE |
711 | { |
712 | .ctl_name = CTL_UNNUMBERED, | |
713 | .procname = "kstack_depth_to_print", | |
714 | .data = &kstack_depth_to_print, | |
715 | .maxlen = sizeof(int), | |
716 | .mode = 0644, | |
717 | .proc_handler = &proc_dointvec, | |
718 | }, | |
1da177e4 | 719 | #endif |
7a9166e3 | 720 | #if defined(CONFIG_MMU) |
1da177e4 LT |
721 | { |
722 | .ctl_name = KERN_RANDOMIZE, | |
723 | .procname = "randomize_va_space", | |
724 | .data = &randomize_va_space, | |
725 | .maxlen = sizeof(int), | |
726 | .mode = 0644, | |
727 | .proc_handler = &proc_dointvec, | |
728 | }, | |
7a9166e3 | 729 | #endif |
0152fb37 | 730 | #if defined(CONFIG_S390) && defined(CONFIG_SMP) |
951f22d5 MS |
731 | { |
732 | .ctl_name = KERN_SPIN_RETRY, | |
733 | .procname = "spin_retry", | |
734 | .data = &spin_retry, | |
735 | .maxlen = sizeof (int), | |
736 | .mode = 0644, | |
737 | .proc_handler = &proc_dointvec, | |
738 | }, | |
c255d844 PM |
739 | #endif |
740 | #ifdef CONFIG_ACPI_SLEEP | |
741 | { | |
742 | .ctl_name = KERN_ACPI_VIDEO_FLAGS, | |
743 | .procname = "acpi_video_flags", | |
744 | .data = &acpi_video_flags, | |
745 | .maxlen = sizeof (unsigned long), | |
746 | .mode = 0644, | |
7f99f06f | 747 | .proc_handler = &proc_doulongvec_minmax, |
c255d844 | 748 | }, |
d2b176ed JS |
749 | #endif |
750 | #ifdef CONFIG_IA64 | |
751 | { | |
752 | .ctl_name = KERN_IA64_UNALIGNED, | |
753 | .procname = "ignore-unaligned-usertrap", | |
754 | .data = &no_unaligned_warning, | |
755 | .maxlen = sizeof (int), | |
756 | .mode = 0644, | |
757 | .proc_handler = &proc_dointvec, | |
758 | }, | |
bebfa101 AK |
759 | #endif |
760 | #ifdef CONFIG_COMPAT | |
761 | { | |
762 | .ctl_name = KERN_COMPAT_LOG, | |
763 | .procname = "compat-log", | |
764 | .data = &compat_log, | |
765 | .maxlen = sizeof (int), | |
766 | .mode = 0644, | |
767 | .proc_handler = &proc_dointvec, | |
768 | }, | |
951f22d5 | 769 | #endif |
23f78d4a IM |
770 | #ifdef CONFIG_RT_MUTEXES |
771 | { | |
772 | .ctl_name = KERN_MAX_LOCK_DEPTH, | |
773 | .procname = "max_lock_depth", | |
774 | .data = &max_lock_depth, | |
775 | .maxlen = sizeof(int), | |
776 | .mode = 0644, | |
777 | .proc_handler = &proc_dointvec, | |
778 | }, | |
779 | #endif | |
780 | ||
1da177e4 LT |
781 | { .ctl_name = 0 } |
782 | }; | |
783 | ||
784 | /* Constants for minimum and maximum testing in vm_table. | |
785 | We use these as one-element integer vectors. */ | |
786 | static int zero; | |
787 | static int one_hundred = 100; | |
788 | ||
789 | ||
790 | static ctl_table vm_table[] = { | |
791 | { | |
792 | .ctl_name = VM_OVERCOMMIT_MEMORY, | |
793 | .procname = "overcommit_memory", | |
794 | .data = &sysctl_overcommit_memory, | |
795 | .maxlen = sizeof(sysctl_overcommit_memory), | |
796 | .mode = 0644, | |
797 | .proc_handler = &proc_dointvec, | |
798 | }, | |
fadd8fbd KH |
799 | { |
800 | .ctl_name = VM_PANIC_ON_OOM, | |
801 | .procname = "panic_on_oom", | |
802 | .data = &sysctl_panic_on_oom, | |
803 | .maxlen = sizeof(sysctl_panic_on_oom), | |
804 | .mode = 0644, | |
805 | .proc_handler = &proc_dointvec, | |
806 | }, | |
1da177e4 LT |
807 | { |
808 | .ctl_name = VM_OVERCOMMIT_RATIO, | |
809 | .procname = "overcommit_ratio", | |
810 | .data = &sysctl_overcommit_ratio, | |
811 | .maxlen = sizeof(sysctl_overcommit_ratio), | |
812 | .mode = 0644, | |
813 | .proc_handler = &proc_dointvec, | |
814 | }, | |
815 | { | |
816 | .ctl_name = VM_PAGE_CLUSTER, | |
817 | .procname = "page-cluster", | |
818 | .data = &page_cluster, | |
819 | .maxlen = sizeof(int), | |
820 | .mode = 0644, | |
821 | .proc_handler = &proc_dointvec, | |
822 | }, | |
823 | { | |
824 | .ctl_name = VM_DIRTY_BACKGROUND, | |
825 | .procname = "dirty_background_ratio", | |
826 | .data = &dirty_background_ratio, | |
827 | .maxlen = sizeof(dirty_background_ratio), | |
828 | .mode = 0644, | |
829 | .proc_handler = &proc_dointvec_minmax, | |
830 | .strategy = &sysctl_intvec, | |
831 | .extra1 = &zero, | |
832 | .extra2 = &one_hundred, | |
833 | }, | |
834 | { | |
835 | .ctl_name = VM_DIRTY_RATIO, | |
836 | .procname = "dirty_ratio", | |
837 | .data = &vm_dirty_ratio, | |
838 | .maxlen = sizeof(vm_dirty_ratio), | |
839 | .mode = 0644, | |
840 | .proc_handler = &proc_dointvec_minmax, | |
841 | .strategy = &sysctl_intvec, | |
842 | .extra1 = &zero, | |
843 | .extra2 = &one_hundred, | |
844 | }, | |
845 | { | |
846 | .ctl_name = VM_DIRTY_WB_CS, | |
847 | .procname = "dirty_writeback_centisecs", | |
f6ef9438 BS |
848 | .data = &dirty_writeback_interval, |
849 | .maxlen = sizeof(dirty_writeback_interval), | |
1da177e4 LT |
850 | .mode = 0644, |
851 | .proc_handler = &dirty_writeback_centisecs_handler, | |
852 | }, | |
853 | { | |
854 | .ctl_name = VM_DIRTY_EXPIRE_CS, | |
855 | .procname = "dirty_expire_centisecs", | |
f6ef9438 BS |
856 | .data = &dirty_expire_interval, |
857 | .maxlen = sizeof(dirty_expire_interval), | |
1da177e4 | 858 | .mode = 0644, |
f6ef9438 | 859 | .proc_handler = &proc_dointvec_userhz_jiffies, |
1da177e4 LT |
860 | }, |
861 | { | |
862 | .ctl_name = VM_NR_PDFLUSH_THREADS, | |
863 | .procname = "nr_pdflush_threads", | |
864 | .data = &nr_pdflush_threads, | |
865 | .maxlen = sizeof nr_pdflush_threads, | |
866 | .mode = 0444 /* read-only*/, | |
867 | .proc_handler = &proc_dointvec, | |
868 | }, | |
869 | { | |
870 | .ctl_name = VM_SWAPPINESS, | |
871 | .procname = "swappiness", | |
872 | .data = &vm_swappiness, | |
873 | .maxlen = sizeof(vm_swappiness), | |
874 | .mode = 0644, | |
875 | .proc_handler = &proc_dointvec_minmax, | |
876 | .strategy = &sysctl_intvec, | |
877 | .extra1 = &zero, | |
878 | .extra2 = &one_hundred, | |
879 | }, | |
880 | #ifdef CONFIG_HUGETLB_PAGE | |
881 | { | |
882 | .ctl_name = VM_HUGETLB_PAGES, | |
883 | .procname = "nr_hugepages", | |
884 | .data = &max_huge_pages, | |
885 | .maxlen = sizeof(unsigned long), | |
886 | .mode = 0644, | |
887 | .proc_handler = &hugetlb_sysctl_handler, | |
888 | .extra1 = (void *)&hugetlb_zero, | |
889 | .extra2 = (void *)&hugetlb_infinity, | |
890 | }, | |
891 | { | |
892 | .ctl_name = VM_HUGETLB_GROUP, | |
893 | .procname = "hugetlb_shm_group", | |
894 | .data = &sysctl_hugetlb_shm_group, | |
895 | .maxlen = sizeof(gid_t), | |
896 | .mode = 0644, | |
897 | .proc_handler = &proc_dointvec, | |
898 | }, | |
899 | #endif | |
900 | { | |
901 | .ctl_name = VM_LOWMEM_RESERVE_RATIO, | |
902 | .procname = "lowmem_reserve_ratio", | |
903 | .data = &sysctl_lowmem_reserve_ratio, | |
904 | .maxlen = sizeof(sysctl_lowmem_reserve_ratio), | |
905 | .mode = 0644, | |
906 | .proc_handler = &lowmem_reserve_ratio_sysctl_handler, | |
907 | .strategy = &sysctl_intvec, | |
908 | }, | |
9d0243bc AM |
909 | { |
910 | .ctl_name = VM_DROP_PAGECACHE, | |
911 | .procname = "drop_caches", | |
912 | .data = &sysctl_drop_caches, | |
913 | .maxlen = sizeof(int), | |
914 | .mode = 0644, | |
915 | .proc_handler = drop_caches_sysctl_handler, | |
916 | .strategy = &sysctl_intvec, | |
917 | }, | |
1da177e4 LT |
918 | { |
919 | .ctl_name = VM_MIN_FREE_KBYTES, | |
920 | .procname = "min_free_kbytes", | |
921 | .data = &min_free_kbytes, | |
922 | .maxlen = sizeof(min_free_kbytes), | |
923 | .mode = 0644, | |
924 | .proc_handler = &min_free_kbytes_sysctl_handler, | |
925 | .strategy = &sysctl_intvec, | |
926 | .extra1 = &zero, | |
927 | }, | |
8ad4b1fb RS |
928 | { |
929 | .ctl_name = VM_PERCPU_PAGELIST_FRACTION, | |
930 | .procname = "percpu_pagelist_fraction", | |
931 | .data = &percpu_pagelist_fraction, | |
932 | .maxlen = sizeof(percpu_pagelist_fraction), | |
933 | .mode = 0644, | |
934 | .proc_handler = &percpu_pagelist_fraction_sysctl_handler, | |
935 | .strategy = &sysctl_intvec, | |
936 | .extra1 = &min_percpu_pagelist_fract, | |
937 | }, | |
1da177e4 LT |
938 | #ifdef CONFIG_MMU |
939 | { | |
940 | .ctl_name = VM_MAX_MAP_COUNT, | |
941 | .procname = "max_map_count", | |
942 | .data = &sysctl_max_map_count, | |
943 | .maxlen = sizeof(sysctl_max_map_count), | |
944 | .mode = 0644, | |
945 | .proc_handler = &proc_dointvec | |
946 | }, | |
947 | #endif | |
948 | { | |
949 | .ctl_name = VM_LAPTOP_MODE, | |
950 | .procname = "laptop_mode", | |
951 | .data = &laptop_mode, | |
952 | .maxlen = sizeof(laptop_mode), | |
953 | .mode = 0644, | |
ed5b43f1 BS |
954 | .proc_handler = &proc_dointvec_jiffies, |
955 | .strategy = &sysctl_jiffies, | |
1da177e4 LT |
956 | }, |
957 | { | |
958 | .ctl_name = VM_BLOCK_DUMP, | |
959 | .procname = "block_dump", | |
960 | .data = &block_dump, | |
961 | .maxlen = sizeof(block_dump), | |
962 | .mode = 0644, | |
963 | .proc_handler = &proc_dointvec, | |
964 | .strategy = &sysctl_intvec, | |
965 | .extra1 = &zero, | |
966 | }, | |
967 | { | |
968 | .ctl_name = VM_VFS_CACHE_PRESSURE, | |
969 | .procname = "vfs_cache_pressure", | |
970 | .data = &sysctl_vfs_cache_pressure, | |
971 | .maxlen = sizeof(sysctl_vfs_cache_pressure), | |
972 | .mode = 0644, | |
973 | .proc_handler = &proc_dointvec, | |
974 | .strategy = &sysctl_intvec, | |
975 | .extra1 = &zero, | |
976 | }, | |
977 | #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT | |
978 | { | |
979 | .ctl_name = VM_LEGACY_VA_LAYOUT, | |
980 | .procname = "legacy_va_layout", | |
981 | .data = &sysctl_legacy_va_layout, | |
982 | .maxlen = sizeof(sysctl_legacy_va_layout), | |
983 | .mode = 0644, | |
984 | .proc_handler = &proc_dointvec, | |
985 | .strategy = &sysctl_intvec, | |
986 | .extra1 = &zero, | |
987 | }, | |
988 | #endif | |
1743660b CL |
989 | #ifdef CONFIG_NUMA |
990 | { | |
991 | .ctl_name = VM_ZONE_RECLAIM_MODE, | |
992 | .procname = "zone_reclaim_mode", | |
993 | .data = &zone_reclaim_mode, | |
994 | .maxlen = sizeof(zone_reclaim_mode), | |
995 | .mode = 0644, | |
996 | .proc_handler = &proc_dointvec, | |
c84db23c CL |
997 | .strategy = &sysctl_intvec, |
998 | .extra1 = &zero, | |
1743660b | 999 | }, |
9614634f CL |
1000 | { |
1001 | .ctl_name = VM_MIN_UNMAPPED, | |
1002 | .procname = "min_unmapped_ratio", | |
1003 | .data = &sysctl_min_unmapped_ratio, | |
1004 | .maxlen = sizeof(sysctl_min_unmapped_ratio), | |
1005 | .mode = 0644, | |
1006 | .proc_handler = &sysctl_min_unmapped_ratio_sysctl_handler, | |
1007 | .strategy = &sysctl_intvec, | |
1008 | .extra1 = &zero, | |
1009 | .extra2 = &one_hundred, | |
1010 | }, | |
0ff38490 CL |
1011 | { |
1012 | .ctl_name = VM_MIN_SLAB, | |
1013 | .procname = "min_slab_ratio", | |
1014 | .data = &sysctl_min_slab_ratio, | |
1015 | .maxlen = sizeof(sysctl_min_slab_ratio), | |
1016 | .mode = 0644, | |
1017 | .proc_handler = &sysctl_min_slab_ratio_sysctl_handler, | |
1018 | .strategy = &sysctl_intvec, | |
1019 | .extra1 = &zero, | |
1020 | .extra2 = &one_hundred, | |
1021 | }, | |
e6e5494c IM |
1022 | #endif |
1023 | #ifdef CONFIG_X86_32 | |
1024 | { | |
1025 | .ctl_name = VM_VDSO_ENABLED, | |
1026 | .procname = "vdso_enabled", | |
1027 | .data = &vdso_enabled, | |
1028 | .maxlen = sizeof(vdso_enabled), | |
1029 | .mode = 0644, | |
1030 | .proc_handler = &proc_dointvec, | |
1031 | .strategy = &sysctl_intvec, | |
1032 | .extra1 = &zero, | |
1033 | }, | |
1da177e4 LT |
1034 | #endif |
1035 | { .ctl_name = 0 } | |
1036 | }; | |
1037 | ||
1da177e4 LT |
1038 | static ctl_table fs_table[] = { |
1039 | { | |
1040 | .ctl_name = FS_NRINODE, | |
1041 | .procname = "inode-nr", | |
1042 | .data = &inodes_stat, | |
1043 | .maxlen = 2*sizeof(int), | |
1044 | .mode = 0444, | |
1045 | .proc_handler = &proc_dointvec, | |
1046 | }, | |
1047 | { | |
1048 | .ctl_name = FS_STATINODE, | |
1049 | .procname = "inode-state", | |
1050 | .data = &inodes_stat, | |
1051 | .maxlen = 7*sizeof(int), | |
1052 | .mode = 0444, | |
1053 | .proc_handler = &proc_dointvec, | |
1054 | }, | |
1055 | { | |
1056 | .ctl_name = FS_NRFILE, | |
1057 | .procname = "file-nr", | |
1058 | .data = &files_stat, | |
1059 | .maxlen = 3*sizeof(int), | |
1060 | .mode = 0444, | |
529bf6be | 1061 | .proc_handler = &proc_nr_files, |
1da177e4 LT |
1062 | }, |
1063 | { | |
1064 | .ctl_name = FS_MAXFILE, | |
1065 | .procname = "file-max", | |
1066 | .data = &files_stat.max_files, | |
1067 | .maxlen = sizeof(int), | |
1068 | .mode = 0644, | |
1069 | .proc_handler = &proc_dointvec, | |
1070 | }, | |
1071 | { | |
1072 | .ctl_name = FS_DENTRY, | |
1073 | .procname = "dentry-state", | |
1074 | .data = &dentry_stat, | |
1075 | .maxlen = 6*sizeof(int), | |
1076 | .mode = 0444, | |
1077 | .proc_handler = &proc_dointvec, | |
1078 | }, | |
1079 | { | |
1080 | .ctl_name = FS_OVERFLOWUID, | |
1081 | .procname = "overflowuid", | |
1082 | .data = &fs_overflowuid, | |
1083 | .maxlen = sizeof(int), | |
1084 | .mode = 0644, | |
1085 | .proc_handler = &proc_dointvec_minmax, | |
1086 | .strategy = &sysctl_intvec, | |
1087 | .extra1 = &minolduid, | |
1088 | .extra2 = &maxolduid, | |
1089 | }, | |
1090 | { | |
1091 | .ctl_name = FS_OVERFLOWGID, | |
1092 | .procname = "overflowgid", | |
1093 | .data = &fs_overflowgid, | |
1094 | .maxlen = sizeof(int), | |
1095 | .mode = 0644, | |
1096 | .proc_handler = &proc_dointvec_minmax, | |
1097 | .strategy = &sysctl_intvec, | |
1098 | .extra1 = &minolduid, | |
1099 | .extra2 = &maxolduid, | |
1100 | }, | |
1101 | { | |
1102 | .ctl_name = FS_LEASES, | |
1103 | .procname = "leases-enable", | |
1104 | .data = &leases_enable, | |
1105 | .maxlen = sizeof(int), | |
1106 | .mode = 0644, | |
1107 | .proc_handler = &proc_dointvec, | |
1108 | }, | |
1109 | #ifdef CONFIG_DNOTIFY | |
1110 | { | |
1111 | .ctl_name = FS_DIR_NOTIFY, | |
1112 | .procname = "dir-notify-enable", | |
1113 | .data = &dir_notify_enable, | |
1114 | .maxlen = sizeof(int), | |
1115 | .mode = 0644, | |
1116 | .proc_handler = &proc_dointvec, | |
1117 | }, | |
1118 | #endif | |
1119 | #ifdef CONFIG_MMU | |
1120 | { | |
1121 | .ctl_name = FS_LEASE_TIME, | |
1122 | .procname = "lease-break-time", | |
1123 | .data = &lease_break_time, | |
1124 | .maxlen = sizeof(int), | |
1125 | .mode = 0644, | |
1126 | .proc_handler = &proc_dointvec, | |
1127 | }, | |
1128 | { | |
1129 | .ctl_name = FS_AIO_NR, | |
1130 | .procname = "aio-nr", | |
1131 | .data = &aio_nr, | |
1132 | .maxlen = sizeof(aio_nr), | |
1133 | .mode = 0444, | |
d55b5fda | 1134 | .proc_handler = &proc_doulongvec_minmax, |
1da177e4 LT |
1135 | }, |
1136 | { | |
1137 | .ctl_name = FS_AIO_MAX_NR, | |
1138 | .procname = "aio-max-nr", | |
1139 | .data = &aio_max_nr, | |
1140 | .maxlen = sizeof(aio_max_nr), | |
1141 | .mode = 0644, | |
d55b5fda | 1142 | .proc_handler = &proc_doulongvec_minmax, |
1da177e4 | 1143 | }, |
2d9048e2 | 1144 | #ifdef CONFIG_INOTIFY_USER |
0399cb08 RL |
1145 | { |
1146 | .ctl_name = FS_INOTIFY, | |
1147 | .procname = "inotify", | |
1148 | .mode = 0555, | |
1149 | .child = inotify_table, | |
1150 | }, | |
1151 | #endif | |
1da177e4 | 1152 | #endif |
d6e71144 AC |
1153 | { |
1154 | .ctl_name = KERN_SETUID_DUMPABLE, | |
1155 | .procname = "suid_dumpable", | |
1156 | .data = &suid_dumpable, | |
1157 | .maxlen = sizeof(int), | |
1158 | .mode = 0644, | |
1159 | .proc_handler = &proc_dointvec, | |
1160 | }, | |
1da177e4 LT |
1161 | { .ctl_name = 0 } |
1162 | }; | |
1163 | ||
1164 | static ctl_table debug_table[] = { | |
1165 | { .ctl_name = 0 } | |
1166 | }; | |
1167 | ||
1168 | static ctl_table dev_table[] = { | |
1169 | { .ctl_name = 0 } | |
0eeca283 | 1170 | }; |
1da177e4 LT |
1171 | |
1172 | extern void init_irq_proc (void); | |
1173 | ||
330d57fb AV |
1174 | static DEFINE_SPINLOCK(sysctl_lock); |
1175 | ||
1176 | /* called under sysctl_lock */ | |
1177 | static int use_table(struct ctl_table_header *p) | |
1178 | { | |
1179 | if (unlikely(p->unregistering)) | |
1180 | return 0; | |
1181 | p->used++; | |
1182 | return 1; | |
1183 | } | |
1184 | ||
1185 | /* called under sysctl_lock */ | |
1186 | static void unuse_table(struct ctl_table_header *p) | |
1187 | { | |
1188 | if (!--p->used) | |
1189 | if (unlikely(p->unregistering)) | |
1190 | complete(p->unregistering); | |
1191 | } | |
1192 | ||
1193 | /* called under sysctl_lock, will reacquire if has to wait */ | |
1194 | static void start_unregistering(struct ctl_table_header *p) | |
1195 | { | |
1196 | /* | |
1197 | * if p->used is 0, nobody will ever touch that entry again; | |
1198 | * we'll eliminate all paths to it before dropping sysctl_lock | |
1199 | */ | |
1200 | if (unlikely(p->used)) { | |
1201 | struct completion wait; | |
1202 | init_completion(&wait); | |
1203 | p->unregistering = &wait; | |
1204 | spin_unlock(&sysctl_lock); | |
1205 | wait_for_completion(&wait); | |
1206 | spin_lock(&sysctl_lock); | |
1207 | } | |
1208 | /* | |
1209 | * do not remove from the list until nobody holds it; walking the | |
1210 | * list in do_sysctl() relies on that. | |
1211 | */ | |
1212 | list_del_init(&p->ctl_entry); | |
1213 | } | |
1214 | ||
1da177e4 LT |
1215 | void __init sysctl_init(void) |
1216 | { | |
b89a8171 | 1217 | #ifdef CONFIG_PROC_SYSCTL |
330d57fb | 1218 | register_proc_table(root_table, proc_sys_root, &root_table_header); |
1da177e4 LT |
1219 | init_irq_proc(); |
1220 | #endif | |
1221 | } | |
1222 | ||
b89a8171 | 1223 | #ifdef CONFIG_SYSCTL_SYSCALL |
1da177e4 LT |
1224 | int do_sysctl(int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp, |
1225 | void __user *newval, size_t newlen) | |
1226 | { | |
1227 | struct list_head *tmp; | |
330d57fb | 1228 | int error = -ENOTDIR; |
1da177e4 LT |
1229 | |
1230 | if (nlen <= 0 || nlen >= CTL_MAXNAME) | |
1231 | return -ENOTDIR; | |
1232 | if (oldval) { | |
1233 | int old_len; | |
1234 | if (!oldlenp || get_user(old_len, oldlenp)) | |
1235 | return -EFAULT; | |
1236 | } | |
330d57fb | 1237 | spin_lock(&sysctl_lock); |
1da177e4 LT |
1238 | tmp = &root_table_header.ctl_entry; |
1239 | do { | |
1240 | struct ctl_table_header *head = | |
1241 | list_entry(tmp, struct ctl_table_header, ctl_entry); | |
1242 | void *context = NULL; | |
330d57fb AV |
1243 | |
1244 | if (!use_table(head)) | |
1245 | continue; | |
1246 | ||
1247 | spin_unlock(&sysctl_lock); | |
1248 | ||
1249 | error = parse_table(name, nlen, oldval, oldlenp, | |
1da177e4 LT |
1250 | newval, newlen, head->ctl_table, |
1251 | &context); | |
5a6b454f | 1252 | kfree(context); |
330d57fb AV |
1253 | |
1254 | spin_lock(&sysctl_lock); | |
1255 | unuse_table(head); | |
1da177e4 | 1256 | if (error != -ENOTDIR) |
330d57fb AV |
1257 | break; |
1258 | } while ((tmp = tmp->next) != &root_table_header.ctl_entry); | |
1259 | spin_unlock(&sysctl_lock); | |
1260 | return error; | |
1da177e4 LT |
1261 | } |
1262 | ||
1263 | asmlinkage long sys_sysctl(struct __sysctl_args __user *args) | |
1264 | { | |
1265 | struct __sysctl_args tmp; | |
1266 | int error; | |
1267 | ||
1268 | if (copy_from_user(&tmp, args, sizeof(tmp))) | |
1269 | return -EFAULT; | |
1270 | ||
1271 | lock_kernel(); | |
1272 | error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp, | |
1273 | tmp.newval, tmp.newlen); | |
1274 | unlock_kernel(); | |
1275 | return error; | |
1276 | } | |
b89a8171 | 1277 | #endif /* CONFIG_SYSCTL_SYSCALL */ |
1da177e4 LT |
1278 | |
1279 | /* | |
1280 | * ctl_perm does NOT grant the superuser all rights automatically, because | |
1281 | * some sysctl variables are readonly even to root. | |
1282 | */ | |
1283 | ||
1284 | static int test_perm(int mode, int op) | |
1285 | { | |
1286 | if (!current->euid) | |
1287 | mode >>= 6; | |
1288 | else if (in_egroup_p(0)) | |
1289 | mode >>= 3; | |
1290 | if ((mode & op & 0007) == op) | |
1291 | return 0; | |
1292 | return -EACCES; | |
1293 | } | |
1294 | ||
1295 | static inline int ctl_perm(ctl_table *table, int op) | |
1296 | { | |
1297 | int error; | |
1298 | error = security_sysctl(table, op); | |
1299 | if (error) | |
1300 | return error; | |
1301 | return test_perm(table->mode, op); | |
1302 | } | |
1303 | ||
b89a8171 | 1304 | #ifdef CONFIG_SYSCTL_SYSCALL |
1da177e4 LT |
1305 | static int parse_table(int __user *name, int nlen, |
1306 | void __user *oldval, size_t __user *oldlenp, | |
1307 | void __user *newval, size_t newlen, | |
1308 | ctl_table *table, void **context) | |
1309 | { | |
1310 | int n; | |
1311 | repeat: | |
1312 | if (!nlen) | |
1313 | return -ENOTDIR; | |
1314 | if (get_user(n, name)) | |
1315 | return -EFAULT; | |
d99f160a EB |
1316 | for ( ; table->ctl_name || table->procname; table++) { |
1317 | if (!table->ctl_name) | |
1318 | continue; | |
1da177e4 LT |
1319 | if (n == table->ctl_name || table->ctl_name == CTL_ANY) { |
1320 | int error; | |
1321 | if (table->child) { | |
1322 | if (ctl_perm(table, 001)) | |
1323 | return -EPERM; | |
1324 | if (table->strategy) { | |
1325 | error = table->strategy( | |
1326 | table, name, nlen, | |
1327 | oldval, oldlenp, | |
1328 | newval, newlen, context); | |
1329 | if (error) | |
1330 | return error; | |
1331 | } | |
1332 | name++; | |
1333 | nlen--; | |
1334 | table = table->child; | |
1335 | goto repeat; | |
1336 | } | |
1337 | error = do_sysctl_strategy(table, name, nlen, | |
1338 | oldval, oldlenp, | |
1339 | newval, newlen, context); | |
1340 | return error; | |
1341 | } | |
1342 | } | |
1343 | return -ENOTDIR; | |
1344 | } | |
1345 | ||
1346 | /* Perform the actual read/write of a sysctl table entry. */ | |
1347 | int do_sysctl_strategy (ctl_table *table, | |
1348 | int __user *name, int nlen, | |
1349 | void __user *oldval, size_t __user *oldlenp, | |
1350 | void __user *newval, size_t newlen, void **context) | |
1351 | { | |
1352 | int op = 0, rc; | |
1353 | size_t len; | |
1354 | ||
1355 | if (oldval) | |
1356 | op |= 004; | |
1357 | if (newval) | |
1358 | op |= 002; | |
1359 | if (ctl_perm(table, op)) | |
1360 | return -EPERM; | |
1361 | ||
1362 | if (table->strategy) { | |
1363 | rc = table->strategy(table, name, nlen, oldval, oldlenp, | |
1364 | newval, newlen, context); | |
1365 | if (rc < 0) | |
1366 | return rc; | |
1367 | if (rc > 0) | |
1368 | return 0; | |
1369 | } | |
1370 | ||
1371 | /* If there is no strategy routine, or if the strategy returns | |
1372 | * zero, proceed with automatic r/w */ | |
1373 | if (table->data && table->maxlen) { | |
1374 | if (oldval && oldlenp) { | |
1375 | if (get_user(len, oldlenp)) | |
1376 | return -EFAULT; | |
1377 | if (len) { | |
1378 | if (len > table->maxlen) | |
1379 | len = table->maxlen; | |
1380 | if(copy_to_user(oldval, table->data, len)) | |
1381 | return -EFAULT; | |
1382 | if(put_user(len, oldlenp)) | |
1383 | return -EFAULT; | |
1384 | } | |
1385 | } | |
1386 | if (newval && newlen) { | |
1387 | len = newlen; | |
1388 | if (len > table->maxlen) | |
1389 | len = table->maxlen; | |
1390 | if(copy_from_user(table->data, newval, len)) | |
1391 | return -EFAULT; | |
1392 | } | |
1393 | } | |
1394 | return 0; | |
1395 | } | |
b89a8171 | 1396 | #endif /* CONFIG_SYSCTL_SYSCALL */ |
1da177e4 LT |
1397 | |
1398 | /** | |
1399 | * register_sysctl_table - register a sysctl hierarchy | |
1400 | * @table: the top-level table structure | |
1401 | * @insert_at_head: whether the entry should be inserted in front or at the end | |
1402 | * | |
1403 | * Register a sysctl table hierarchy. @table should be a filled in ctl_table | |
1404 | * array. An entry with a ctl_name of 0 terminates the table. | |
1405 | * | |
1406 | * The members of the &ctl_table structure are used as follows: | |
1407 | * | |
1408 | * ctl_name - This is the numeric sysctl value used by sysctl(2). The number | |
1409 | * must be unique within that level of sysctl | |
1410 | * | |
1411 | * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not | |
1412 | * enter a sysctl file | |
1413 | * | |
1414 | * data - a pointer to data for use by proc_handler | |
1415 | * | |
1416 | * maxlen - the maximum size in bytes of the data | |
1417 | * | |
1418 | * mode - the file permissions for the /proc/sys file, and for sysctl(2) | |
1419 | * | |
1420 | * child - a pointer to the child sysctl table if this entry is a directory, or | |
1421 | * %NULL. | |
1422 | * | |
1423 | * proc_handler - the text handler routine (described below) | |
1424 | * | |
1425 | * strategy - the strategy routine (described below) | |
1426 | * | |
1427 | * de - for internal use by the sysctl routines | |
1428 | * | |
1429 | * extra1, extra2 - extra pointers usable by the proc handler routines | |
1430 | * | |
1431 | * Leaf nodes in the sysctl tree will be represented by a single file | |
1432 | * under /proc; non-leaf nodes will be represented by directories. | |
1433 | * | |
1434 | * sysctl(2) can automatically manage read and write requests through | |
1435 | * the sysctl table. The data and maxlen fields of the ctl_table | |
1436 | * struct enable minimal validation of the values being written to be | |
1437 | * performed, and the mode field allows minimal authentication. | |
1438 | * | |
1439 | * More sophisticated management can be enabled by the provision of a | |
1440 | * strategy routine with the table entry. This will be called before | |
1441 | * any automatic read or write of the data is performed. | |
1442 | * | |
1443 | * The strategy routine may return | |
1444 | * | |
1445 | * < 0 - Error occurred (error is passed to user process) | |
1446 | * | |
1447 | * 0 - OK - proceed with automatic read or write. | |
1448 | * | |
1449 | * > 0 - OK - read or write has been done by the strategy routine, so | |
1450 | * return immediately. | |
1451 | * | |
1452 | * There must be a proc_handler routine for any terminal nodes | |
1453 | * mirrored under /proc/sys (non-terminals are handled by a built-in | |
1454 | * directory handler). Several default handlers are available to | |
1455 | * cover common cases - | |
1456 | * | |
1457 | * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(), | |
1458 | * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(), | |
1459 | * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax() | |
1460 | * | |
1461 | * It is the handler's job to read the input buffer from user memory | |
1462 | * and process it. The handler should return 0 on success. | |
1463 | * | |
1464 | * This routine returns %NULL on a failure to register, and a pointer | |
1465 | * to the table header on success. | |
1466 | */ | |
1467 | struct ctl_table_header *register_sysctl_table(ctl_table * table, | |
1468 | int insert_at_head) | |
1469 | { | |
1470 | struct ctl_table_header *tmp; | |
1471 | tmp = kmalloc(sizeof(struct ctl_table_header), GFP_KERNEL); | |
1472 | if (!tmp) | |
1473 | return NULL; | |
1474 | tmp->ctl_table = table; | |
1475 | INIT_LIST_HEAD(&tmp->ctl_entry); | |
330d57fb AV |
1476 | tmp->used = 0; |
1477 | tmp->unregistering = NULL; | |
1478 | spin_lock(&sysctl_lock); | |
1da177e4 LT |
1479 | if (insert_at_head) |
1480 | list_add(&tmp->ctl_entry, &root_table_header.ctl_entry); | |
1481 | else | |
1482 | list_add_tail(&tmp->ctl_entry, &root_table_header.ctl_entry); | |
330d57fb | 1483 | spin_unlock(&sysctl_lock); |
b89a8171 | 1484 | #ifdef CONFIG_PROC_SYSCTL |
330d57fb | 1485 | register_proc_table(table, proc_sys_root, tmp); |
1da177e4 LT |
1486 | #endif |
1487 | return tmp; | |
1488 | } | |
1489 | ||
1490 | /** | |
1491 | * unregister_sysctl_table - unregister a sysctl table hierarchy | |
1492 | * @header: the header returned from register_sysctl_table | |
1493 | * | |
1494 | * Unregisters the sysctl table and all children. proc entries may not | |
1495 | * actually be removed until they are no longer used by anyone. | |
1496 | */ | |
1497 | void unregister_sysctl_table(struct ctl_table_header * header) | |
1498 | { | |
330d57fb AV |
1499 | might_sleep(); |
1500 | spin_lock(&sysctl_lock); | |
1501 | start_unregistering(header); | |
b89a8171 | 1502 | #ifdef CONFIG_PROC_SYSCTL |
1da177e4 LT |
1503 | unregister_proc_table(header->ctl_table, proc_sys_root); |
1504 | #endif | |
330d57fb | 1505 | spin_unlock(&sysctl_lock); |
1da177e4 LT |
1506 | kfree(header); |
1507 | } | |
1508 | ||
b89a8171 EB |
1509 | #else /* !CONFIG_SYSCTL */ |
1510 | struct ctl_table_header * register_sysctl_table(ctl_table * table, | |
1511 | int insert_at_head) | |
1512 | { | |
1513 | return NULL; | |
1514 | } | |
1515 | ||
1516 | void unregister_sysctl_table(struct ctl_table_header * table) | |
1517 | { | |
1518 | } | |
1519 | ||
1520 | #endif /* CONFIG_SYSCTL */ | |
1521 | ||
1da177e4 LT |
1522 | /* |
1523 | * /proc/sys support | |
1524 | */ | |
1525 | ||
b89a8171 | 1526 | #ifdef CONFIG_PROC_SYSCTL |
1da177e4 LT |
1527 | |
1528 | /* Scan the sysctl entries in table and add them all into /proc */ | |
330d57fb | 1529 | static void register_proc_table(ctl_table * table, struct proc_dir_entry *root, void *set) |
1da177e4 LT |
1530 | { |
1531 | struct proc_dir_entry *de; | |
1532 | int len; | |
1533 | mode_t mode; | |
1534 | ||
d99f160a | 1535 | for (; table->ctl_name || table->procname; table++) { |
1da177e4 LT |
1536 | /* Can't do anything without a proc name. */ |
1537 | if (!table->procname) | |
1538 | continue; | |
1539 | /* Maybe we can't do anything with it... */ | |
1540 | if (!table->proc_handler && !table->child) { | |
1541 | printk(KERN_WARNING "SYSCTL: Can't register %s\n", | |
1542 | table->procname); | |
1543 | continue; | |
1544 | } | |
1545 | ||
1546 | len = strlen(table->procname); | |
1547 | mode = table->mode; | |
1548 | ||
1549 | de = NULL; | |
1550 | if (table->proc_handler) | |
1551 | mode |= S_IFREG; | |
1552 | else { | |
1553 | mode |= S_IFDIR; | |
1554 | for (de = root->subdir; de; de = de->next) { | |
1555 | if (proc_match(len, table->procname, de)) | |
1556 | break; | |
1557 | } | |
1558 | /* If the subdir exists already, de is non-NULL */ | |
1559 | } | |
1560 | ||
1561 | if (!de) { | |
1562 | de = create_proc_entry(table->procname, mode, root); | |
1563 | if (!de) | |
1564 | continue; | |
330d57fb | 1565 | de->set = set; |
1da177e4 LT |
1566 | de->data = (void *) table; |
1567 | if (table->proc_handler) | |
1568 | de->proc_fops = &proc_sys_file_operations; | |
1569 | } | |
1570 | table->de = de; | |
1571 | if (de->mode & S_IFDIR) | |
330d57fb | 1572 | register_proc_table(table->child, de, set); |
1da177e4 LT |
1573 | } |
1574 | } | |
1575 | ||
1576 | /* | |
1577 | * Unregister a /proc sysctl table and any subdirectories. | |
1578 | */ | |
1579 | static void unregister_proc_table(ctl_table * table, struct proc_dir_entry *root) | |
1580 | { | |
1581 | struct proc_dir_entry *de; | |
d99f160a | 1582 | for (; table->ctl_name || table->procname; table++) { |
1da177e4 LT |
1583 | if (!(de = table->de)) |
1584 | continue; | |
1585 | if (de->mode & S_IFDIR) { | |
1586 | if (!table->child) { | |
1587 | printk (KERN_ALERT "Help - malformed sysctl tree on free\n"); | |
1588 | continue; | |
1589 | } | |
1590 | unregister_proc_table(table->child, de); | |
1591 | ||
1592 | /* Don't unregister directories which still have entries.. */ | |
1593 | if (de->subdir) | |
1594 | continue; | |
1595 | } | |
1596 | ||
330d57fb AV |
1597 | /* |
1598 | * In any case, mark the entry as goner; we'll keep it | |
1599 | * around if it's busy, but we'll know to do nothing with | |
1600 | * its fields. We are under sysctl_lock here. | |
1601 | */ | |
1602 | de->data = NULL; | |
1603 | ||
1da177e4 LT |
1604 | /* Don't unregister proc entries that are still being used.. */ |
1605 | if (atomic_read(&de->count)) | |
1606 | continue; | |
1607 | ||
1608 | table->de = NULL; | |
1609 | remove_proc_entry(table->procname, root); | |
1610 | } | |
1611 | } | |
1612 | ||
1613 | static ssize_t do_rw_proc(int write, struct file * file, char __user * buf, | |
1614 | size_t count, loff_t *ppos) | |
1615 | { | |
1616 | int op; | |
f3a43f3f | 1617 | struct proc_dir_entry *de = PDE(file->f_path.dentry->d_inode); |
1da177e4 LT |
1618 | struct ctl_table *table; |
1619 | size_t res; | |
330d57fb | 1620 | ssize_t error = -ENOTDIR; |
1da177e4 | 1621 | |
330d57fb AV |
1622 | spin_lock(&sysctl_lock); |
1623 | if (de && de->data && use_table(de->set)) { | |
1624 | /* | |
1625 | * at that point we know that sysctl was not unregistered | |
1626 | * and won't be until we finish | |
1627 | */ | |
1628 | spin_unlock(&sysctl_lock); | |
1629 | table = (struct ctl_table *) de->data; | |
1630 | if (!table || !table->proc_handler) | |
1631 | goto out; | |
1632 | error = -EPERM; | |
1633 | op = (write ? 002 : 004); | |
1634 | if (ctl_perm(table, op)) | |
1635 | goto out; | |
1636 | ||
1637 | /* careful: calling conventions are nasty here */ | |
1638 | res = count; | |
1639 | error = (*table->proc_handler)(table, write, file, | |
1640 | buf, &res, ppos); | |
1641 | if (!error) | |
1642 | error = res; | |
1643 | out: | |
1644 | spin_lock(&sysctl_lock); | |
1645 | unuse_table(de->set); | |
1646 | } | |
1647 | spin_unlock(&sysctl_lock); | |
1648 | return error; | |
1da177e4 LT |
1649 | } |
1650 | ||
1651 | static int proc_opensys(struct inode *inode, struct file *file) | |
1652 | { | |
1653 | if (file->f_mode & FMODE_WRITE) { | |
1654 | /* | |
1655 | * sysctl entries that are not writable, | |
1656 | * are _NOT_ writable, capabilities or not. | |
1657 | */ | |
1658 | if (!(inode->i_mode & S_IWUSR)) | |
1659 | return -EPERM; | |
1660 | } | |
1661 | ||
1662 | return 0; | |
1663 | } | |
1664 | ||
1665 | static ssize_t proc_readsys(struct file * file, char __user * buf, | |
1666 | size_t count, loff_t *ppos) | |
1667 | { | |
1668 | return do_rw_proc(0, file, buf, count, ppos); | |
1669 | } | |
1670 | ||
1671 | static ssize_t proc_writesys(struct file * file, const char __user * buf, | |
1672 | size_t count, loff_t *ppos) | |
1673 | { | |
1674 | return do_rw_proc(1, file, (char __user *) buf, count, ppos); | |
1675 | } | |
1676 | ||
b1ba4ddd AB |
1677 | static int _proc_do_string(void* data, int maxlen, int write, |
1678 | struct file *filp, void __user *buffer, | |
1679 | size_t *lenp, loff_t *ppos) | |
1da177e4 LT |
1680 | { |
1681 | size_t len; | |
1682 | char __user *p; | |
1683 | char c; | |
1684 | ||
f5dd3d6f | 1685 | if (!data || !maxlen || !*lenp || |
1da177e4 LT |
1686 | (*ppos && !write)) { |
1687 | *lenp = 0; | |
1688 | return 0; | |
1689 | } | |
1690 | ||
1691 | if (write) { | |
1692 | len = 0; | |
1693 | p = buffer; | |
1694 | while (len < *lenp) { | |
1695 | if (get_user(c, p++)) | |
1696 | return -EFAULT; | |
1697 | if (c == 0 || c == '\n') | |
1698 | break; | |
1699 | len++; | |
1700 | } | |
f5dd3d6f SV |
1701 | if (len >= maxlen) |
1702 | len = maxlen-1; | |
1703 | if(copy_from_user(data, buffer, len)) | |
1da177e4 | 1704 | return -EFAULT; |
f5dd3d6f | 1705 | ((char *) data)[len] = 0; |
1da177e4 LT |
1706 | *ppos += *lenp; |
1707 | } else { | |
f5dd3d6f SV |
1708 | len = strlen(data); |
1709 | if (len > maxlen) | |
1710 | len = maxlen; | |
1da177e4 LT |
1711 | if (len > *lenp) |
1712 | len = *lenp; | |
1713 | if (len) | |
f5dd3d6f | 1714 | if(copy_to_user(buffer, data, len)) |
1da177e4 LT |
1715 | return -EFAULT; |
1716 | if (len < *lenp) { | |
1717 | if(put_user('\n', ((char __user *) buffer) + len)) | |
1718 | return -EFAULT; | |
1719 | len++; | |
1720 | } | |
1721 | *lenp = len; | |
1722 | *ppos += len; | |
1723 | } | |
1724 | return 0; | |
1725 | } | |
1726 | ||
f5dd3d6f SV |
1727 | /** |
1728 | * proc_dostring - read a string sysctl | |
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 a string from/to the user buffer. If the kernel | |
1737 | * buffer provided is not large enough to hold the string, the | |
1738 | * string is truncated. The copied string is %NULL-terminated. | |
1739 | * If the string is being read by the user process, it is copied | |
1740 | * and a newline '\n' is added. It is truncated if the buffer is | |
1741 | * not large enough. | |
1742 | * | |
1743 | * Returns 0 on success. | |
1744 | */ | |
1745 | int proc_dostring(ctl_table *table, int write, struct file *filp, | |
1746 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
1747 | { | |
1748 | return _proc_do_string(table->data, table->maxlen, write, filp, | |
1749 | buffer, lenp, ppos); | |
1750 | } | |
1751 | ||
1da177e4 LT |
1752 | /* |
1753 | * Special case of dostring for the UTS structure. This has locks | |
1754 | * to observe. Should this be in kernel/sys.c ???? | |
1755 | */ | |
1756 | ||
8218c74c SH |
1757 | #ifndef CONFIG_UTS_NS |
1758 | static int proc_do_uts_string(ctl_table *table, int write, struct file *filp, | |
1da177e4 LT |
1759 | void __user *buffer, size_t *lenp, loff_t *ppos) |
1760 | { | |
1761 | int r; | |
1762 | ||
1763 | if (!write) { | |
1764 | down_read(&uts_sem); | |
1765 | r=proc_dostring(table,0,filp,buffer,lenp, ppos); | |
1766 | up_read(&uts_sem); | |
1767 | } else { | |
1768 | down_write(&uts_sem); | |
1769 | r=proc_dostring(table,1,filp,buffer,lenp, ppos); | |
1770 | up_write(&uts_sem); | |
1771 | } | |
1772 | return r; | |
1773 | } | |
8218c74c SH |
1774 | #else /* !CONFIG_UTS_NS */ |
1775 | static int proc_do_uts_string(ctl_table *table, int write, struct file *filp, | |
1776 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
1777 | { | |
1778 | int r; | |
1779 | struct uts_namespace* uts_ns = current->nsproxy->uts_ns; | |
1780 | char* which; | |
1781 | ||
1782 | switch (table->ctl_name) { | |
1783 | case KERN_OSTYPE: | |
1784 | which = uts_ns->name.sysname; | |
1785 | break; | |
1786 | case KERN_NODENAME: | |
1787 | which = uts_ns->name.nodename; | |
1788 | break; | |
1789 | case KERN_OSRELEASE: | |
1790 | which = uts_ns->name.release; | |
1791 | break; | |
1792 | case KERN_VERSION: | |
1793 | which = uts_ns->name.version; | |
1794 | break; | |
1795 | case KERN_DOMAINNAME: | |
1796 | which = uts_ns->name.domainname; | |
1797 | break; | |
1798 | default: | |
1799 | r = -EINVAL; | |
1800 | goto out; | |
1801 | } | |
1802 | ||
1803 | if (!write) { | |
1804 | down_read(&uts_sem); | |
1805 | r=_proc_do_string(which,table->maxlen,0,filp,buffer,lenp, ppos); | |
1806 | up_read(&uts_sem); | |
1807 | } else { | |
1808 | down_write(&uts_sem); | |
1809 | r=_proc_do_string(which,table->maxlen,1,filp,buffer,lenp, ppos); | |
1810 | up_write(&uts_sem); | |
1811 | } | |
1812 | out: | |
1813 | return r; | |
1814 | } | |
1815 | #endif /* !CONFIG_UTS_NS */ | |
1da177e4 LT |
1816 | |
1817 | static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp, | |
1818 | int *valp, | |
1819 | int write, void *data) | |
1820 | { | |
1821 | if (write) { | |
1822 | *valp = *negp ? -*lvalp : *lvalp; | |
1823 | } else { | |
1824 | int val = *valp; | |
1825 | if (val < 0) { | |
1826 | *negp = -1; | |
1827 | *lvalp = (unsigned long)-val; | |
1828 | } else { | |
1829 | *negp = 0; | |
1830 | *lvalp = (unsigned long)val; | |
1831 | } | |
1832 | } | |
1833 | return 0; | |
1834 | } | |
1835 | ||
fcfbd547 KK |
1836 | static int __do_proc_dointvec(void *tbl_data, ctl_table *table, |
1837 | int write, struct file *filp, void __user *buffer, | |
1838 | size_t *lenp, loff_t *ppos, | |
1da177e4 LT |
1839 | int (*conv)(int *negp, unsigned long *lvalp, int *valp, |
1840 | int write, void *data), | |
1841 | void *data) | |
1842 | { | |
1843 | #define TMPBUFLEN 21 | |
1844 | int *i, vleft, first=1, neg, val; | |
1845 | unsigned long lval; | |
1846 | size_t left, len; | |
1847 | ||
1848 | char buf[TMPBUFLEN], *p; | |
1849 | char __user *s = buffer; | |
1850 | ||
fcfbd547 | 1851 | if (!tbl_data || !table->maxlen || !*lenp || |
1da177e4 LT |
1852 | (*ppos && !write)) { |
1853 | *lenp = 0; | |
1854 | return 0; | |
1855 | } | |
1856 | ||
fcfbd547 | 1857 | i = (int *) tbl_data; |
1da177e4 LT |
1858 | vleft = table->maxlen / sizeof(*i); |
1859 | left = *lenp; | |
1860 | ||
1861 | if (!conv) | |
1862 | conv = do_proc_dointvec_conv; | |
1863 | ||
1864 | for (; left && vleft--; i++, first=0) { | |
1865 | if (write) { | |
1866 | while (left) { | |
1867 | char c; | |
1868 | if (get_user(c, s)) | |
1869 | return -EFAULT; | |
1870 | if (!isspace(c)) | |
1871 | break; | |
1872 | left--; | |
1873 | s++; | |
1874 | } | |
1875 | if (!left) | |
1876 | break; | |
1877 | neg = 0; | |
1878 | len = left; | |
1879 | if (len > sizeof(buf) - 1) | |
1880 | len = sizeof(buf) - 1; | |
1881 | if (copy_from_user(buf, s, len)) | |
1882 | return -EFAULT; | |
1883 | buf[len] = 0; | |
1884 | p = buf; | |
1885 | if (*p == '-' && left > 1) { | |
1886 | neg = 1; | |
bd9b0bac | 1887 | p++; |
1da177e4 LT |
1888 | } |
1889 | if (*p < '0' || *p > '9') | |
1890 | break; | |
1891 | ||
1892 | lval = simple_strtoul(p, &p, 0); | |
1893 | ||
1894 | len = p-buf; | |
1895 | if ((len < left) && *p && !isspace(*p)) | |
1896 | break; | |
1897 | if (neg) | |
1898 | val = -val; | |
1899 | s += len; | |
1900 | left -= len; | |
1901 | ||
1902 | if (conv(&neg, &lval, i, 1, data)) | |
1903 | break; | |
1904 | } else { | |
1905 | p = buf; | |
1906 | if (!first) | |
1907 | *p++ = '\t'; | |
1908 | ||
1909 | if (conv(&neg, &lval, i, 0, data)) | |
1910 | break; | |
1911 | ||
1912 | sprintf(p, "%s%lu", neg ? "-" : "", lval); | |
1913 | len = strlen(buf); | |
1914 | if (len > left) | |
1915 | len = left; | |
1916 | if(copy_to_user(s, buf, len)) | |
1917 | return -EFAULT; | |
1918 | left -= len; | |
1919 | s += len; | |
1920 | } | |
1921 | } | |
1922 | ||
1923 | if (!write && !first && left) { | |
1924 | if(put_user('\n', s)) | |
1925 | return -EFAULT; | |
1926 | left--, s++; | |
1927 | } | |
1928 | if (write) { | |
1929 | while (left) { | |
1930 | char c; | |
1931 | if (get_user(c, s++)) | |
1932 | return -EFAULT; | |
1933 | if (!isspace(c)) | |
1934 | break; | |
1935 | left--; | |
1936 | } | |
1937 | } | |
1938 | if (write && first) | |
1939 | return -EINVAL; | |
1940 | *lenp -= left; | |
1941 | *ppos += *lenp; | |
1942 | return 0; | |
1943 | #undef TMPBUFLEN | |
1944 | } | |
1945 | ||
fcfbd547 KK |
1946 | static int do_proc_dointvec(ctl_table *table, int write, struct file *filp, |
1947 | void __user *buffer, size_t *lenp, loff_t *ppos, | |
1948 | int (*conv)(int *negp, unsigned long *lvalp, int *valp, | |
1949 | int write, void *data), | |
1950 | void *data) | |
1951 | { | |
1952 | return __do_proc_dointvec(table->data, table, write, filp, | |
1953 | buffer, lenp, ppos, conv, data); | |
1954 | } | |
1955 | ||
1da177e4 LT |
1956 | /** |
1957 | * proc_dointvec - read a vector of integers | |
1958 | * @table: the sysctl table | |
1959 | * @write: %TRUE if this is a write to the sysctl file | |
1960 | * @filp: the file structure | |
1961 | * @buffer: the user buffer | |
1962 | * @lenp: the size of the user buffer | |
1963 | * @ppos: file position | |
1964 | * | |
1965 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer | |
1966 | * values from/to the user buffer, treated as an ASCII string. | |
1967 | * | |
1968 | * Returns 0 on success. | |
1969 | */ | |
1970 | int proc_dointvec(ctl_table *table, int write, struct file *filp, | |
1971 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
1972 | { | |
1973 | return do_proc_dointvec(table,write,filp,buffer,lenp,ppos, | |
1974 | NULL,NULL); | |
1975 | } | |
1976 | ||
1977 | #define OP_SET 0 | |
1978 | #define OP_AND 1 | |
1979 | #define OP_OR 2 | |
1980 | #define OP_MAX 3 | |
1981 | #define OP_MIN 4 | |
1982 | ||
1983 | static int do_proc_dointvec_bset_conv(int *negp, unsigned long *lvalp, | |
1984 | int *valp, | |
1985 | int write, void *data) | |
1986 | { | |
1987 | int op = *(int *)data; | |
1988 | if (write) { | |
1989 | int val = *negp ? -*lvalp : *lvalp; | |
1990 | switch(op) { | |
1991 | case OP_SET: *valp = val; break; | |
1992 | case OP_AND: *valp &= val; break; | |
1993 | case OP_OR: *valp |= val; break; | |
1994 | case OP_MAX: if(*valp < val) | |
1995 | *valp = val; | |
1996 | break; | |
1997 | case OP_MIN: if(*valp > val) | |
1998 | *valp = val; | |
1999 | break; | |
2000 | } | |
2001 | } else { | |
2002 | int val = *valp; | |
2003 | if (val < 0) { | |
2004 | *negp = -1; | |
2005 | *lvalp = (unsigned long)-val; | |
2006 | } else { | |
2007 | *negp = 0; | |
2008 | *lvalp = (unsigned long)val; | |
2009 | } | |
2010 | } | |
2011 | return 0; | |
2012 | } | |
2013 | ||
2014 | /* | |
2015 | * init may raise the set. | |
2016 | */ | |
2017 | ||
2018 | int proc_dointvec_bset(ctl_table *table, int write, struct file *filp, | |
2019 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2020 | { | |
2021 | int op; | |
2022 | ||
2023 | if (!capable(CAP_SYS_MODULE)) { | |
2024 | return -EPERM; | |
2025 | } | |
2026 | ||
f400e198 | 2027 | op = is_init(current) ? OP_SET : OP_AND; |
1da177e4 LT |
2028 | return do_proc_dointvec(table,write,filp,buffer,lenp,ppos, |
2029 | do_proc_dointvec_bset_conv,&op); | |
2030 | } | |
2031 | ||
2032 | struct do_proc_dointvec_minmax_conv_param { | |
2033 | int *min; | |
2034 | int *max; | |
2035 | }; | |
2036 | ||
2037 | static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp, | |
2038 | int *valp, | |
2039 | int write, void *data) | |
2040 | { | |
2041 | struct do_proc_dointvec_minmax_conv_param *param = data; | |
2042 | if (write) { | |
2043 | int val = *negp ? -*lvalp : *lvalp; | |
2044 | if ((param->min && *param->min > val) || | |
2045 | (param->max && *param->max < val)) | |
2046 | return -EINVAL; | |
2047 | *valp = val; | |
2048 | } else { | |
2049 | int val = *valp; | |
2050 | if (val < 0) { | |
2051 | *negp = -1; | |
2052 | *lvalp = (unsigned long)-val; | |
2053 | } else { | |
2054 | *negp = 0; | |
2055 | *lvalp = (unsigned long)val; | |
2056 | } | |
2057 | } | |
2058 | return 0; | |
2059 | } | |
2060 | ||
2061 | /** | |
2062 | * proc_dointvec_minmax - read a vector of integers with min/max values | |
2063 | * @table: the sysctl table | |
2064 | * @write: %TRUE if this is a write to the sysctl file | |
2065 | * @filp: the file structure | |
2066 | * @buffer: the user buffer | |
2067 | * @lenp: the size of the user buffer | |
2068 | * @ppos: file position | |
2069 | * | |
2070 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer | |
2071 | * values from/to the user buffer, treated as an ASCII string. | |
2072 | * | |
2073 | * This routine will ensure the values are within the range specified by | |
2074 | * table->extra1 (min) and table->extra2 (max). | |
2075 | * | |
2076 | * Returns 0 on success. | |
2077 | */ | |
2078 | int proc_dointvec_minmax(ctl_table *table, int write, struct file *filp, | |
2079 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2080 | { | |
2081 | struct do_proc_dointvec_minmax_conv_param param = { | |
2082 | .min = (int *) table->extra1, | |
2083 | .max = (int *) table->extra2, | |
2084 | }; | |
2085 | return do_proc_dointvec(table, write, filp, buffer, lenp, ppos, | |
2086 | do_proc_dointvec_minmax_conv, ¶m); | |
2087 | } | |
2088 | ||
fcfbd547 | 2089 | static int __do_proc_doulongvec_minmax(void *data, ctl_table *table, int write, |
1da177e4 LT |
2090 | struct file *filp, |
2091 | void __user *buffer, | |
2092 | size_t *lenp, loff_t *ppos, | |
2093 | unsigned long convmul, | |
2094 | unsigned long convdiv) | |
2095 | { | |
2096 | #define TMPBUFLEN 21 | |
2097 | unsigned long *i, *min, *max, val; | |
2098 | int vleft, first=1, neg; | |
2099 | size_t len, left; | |
2100 | char buf[TMPBUFLEN], *p; | |
2101 | char __user *s = buffer; | |
2102 | ||
fcfbd547 | 2103 | if (!data || !table->maxlen || !*lenp || |
1da177e4 LT |
2104 | (*ppos && !write)) { |
2105 | *lenp = 0; | |
2106 | return 0; | |
2107 | } | |
2108 | ||
fcfbd547 | 2109 | i = (unsigned long *) data; |
1da177e4 LT |
2110 | min = (unsigned long *) table->extra1; |
2111 | max = (unsigned long *) table->extra2; | |
2112 | vleft = table->maxlen / sizeof(unsigned long); | |
2113 | left = *lenp; | |
2114 | ||
2115 | for (; left && vleft--; i++, min++, max++, first=0) { | |
2116 | if (write) { | |
2117 | while (left) { | |
2118 | char c; | |
2119 | if (get_user(c, s)) | |
2120 | return -EFAULT; | |
2121 | if (!isspace(c)) | |
2122 | break; | |
2123 | left--; | |
2124 | s++; | |
2125 | } | |
2126 | if (!left) | |
2127 | break; | |
2128 | neg = 0; | |
2129 | len = left; | |
2130 | if (len > TMPBUFLEN-1) | |
2131 | len = TMPBUFLEN-1; | |
2132 | if (copy_from_user(buf, s, len)) | |
2133 | return -EFAULT; | |
2134 | buf[len] = 0; | |
2135 | p = buf; | |
2136 | if (*p == '-' && left > 1) { | |
2137 | neg = 1; | |
bd9b0bac | 2138 | p++; |
1da177e4 LT |
2139 | } |
2140 | if (*p < '0' || *p > '9') | |
2141 | break; | |
2142 | val = simple_strtoul(p, &p, 0) * convmul / convdiv ; | |
2143 | len = p-buf; | |
2144 | if ((len < left) && *p && !isspace(*p)) | |
2145 | break; | |
2146 | if (neg) | |
2147 | val = -val; | |
2148 | s += len; | |
2149 | left -= len; | |
2150 | ||
2151 | if(neg) | |
2152 | continue; | |
2153 | if ((min && val < *min) || (max && val > *max)) | |
2154 | continue; | |
2155 | *i = val; | |
2156 | } else { | |
2157 | p = buf; | |
2158 | if (!first) | |
2159 | *p++ = '\t'; | |
2160 | sprintf(p, "%lu", convdiv * (*i) / convmul); | |
2161 | len = strlen(buf); | |
2162 | if (len > left) | |
2163 | len = left; | |
2164 | if(copy_to_user(s, buf, len)) | |
2165 | return -EFAULT; | |
2166 | left -= len; | |
2167 | s += len; | |
2168 | } | |
2169 | } | |
2170 | ||
2171 | if (!write && !first && left) { | |
2172 | if(put_user('\n', s)) | |
2173 | return -EFAULT; | |
2174 | left--, s++; | |
2175 | } | |
2176 | if (write) { | |
2177 | while (left) { | |
2178 | char c; | |
2179 | if (get_user(c, s++)) | |
2180 | return -EFAULT; | |
2181 | if (!isspace(c)) | |
2182 | break; | |
2183 | left--; | |
2184 | } | |
2185 | } | |
2186 | if (write && first) | |
2187 | return -EINVAL; | |
2188 | *lenp -= left; | |
2189 | *ppos += *lenp; | |
2190 | return 0; | |
2191 | #undef TMPBUFLEN | |
2192 | } | |
2193 | ||
fcfbd547 KK |
2194 | static int do_proc_doulongvec_minmax(ctl_table *table, int write, |
2195 | struct file *filp, | |
2196 | void __user *buffer, | |
2197 | size_t *lenp, loff_t *ppos, | |
2198 | unsigned long convmul, | |
2199 | unsigned long convdiv) | |
2200 | { | |
2201 | return __do_proc_doulongvec_minmax(table->data, table, write, | |
2202 | filp, buffer, lenp, ppos, convmul, convdiv); | |
2203 | } | |
2204 | ||
1da177e4 LT |
2205 | /** |
2206 | * proc_doulongvec_minmax - read a vector of long integers with min/max values | |
2207 | * @table: the sysctl table | |
2208 | * @write: %TRUE if this is a write to the sysctl file | |
2209 | * @filp: the file structure | |
2210 | * @buffer: the user buffer | |
2211 | * @lenp: the size of the user buffer | |
2212 | * @ppos: file position | |
2213 | * | |
2214 | * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long | |
2215 | * values from/to the user buffer, treated as an ASCII string. | |
2216 | * | |
2217 | * This routine will ensure the values are within the range specified by | |
2218 | * table->extra1 (min) and table->extra2 (max). | |
2219 | * | |
2220 | * Returns 0 on success. | |
2221 | */ | |
2222 | int proc_doulongvec_minmax(ctl_table *table, int write, struct file *filp, | |
2223 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2224 | { | |
2225 | return do_proc_doulongvec_minmax(table, write, filp, buffer, lenp, ppos, 1l, 1l); | |
2226 | } | |
2227 | ||
2228 | /** | |
2229 | * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values | |
2230 | * @table: the sysctl table | |
2231 | * @write: %TRUE if this is a write to the sysctl file | |
2232 | * @filp: the file structure | |
2233 | * @buffer: the user buffer | |
2234 | * @lenp: the size of the user buffer | |
2235 | * @ppos: file position | |
2236 | * | |
2237 | * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long | |
2238 | * values from/to the user buffer, treated as an ASCII string. The values | |
2239 | * are treated as milliseconds, and converted to jiffies when they are stored. | |
2240 | * | |
2241 | * This routine will ensure the values are within the range specified by | |
2242 | * table->extra1 (min) and table->extra2 (max). | |
2243 | * | |
2244 | * Returns 0 on success. | |
2245 | */ | |
2246 | int proc_doulongvec_ms_jiffies_minmax(ctl_table *table, int write, | |
2247 | struct file *filp, | |
2248 | void __user *buffer, | |
2249 | size_t *lenp, loff_t *ppos) | |
2250 | { | |
2251 | return do_proc_doulongvec_minmax(table, write, filp, buffer, | |
2252 | lenp, ppos, HZ, 1000l); | |
2253 | } | |
2254 | ||
2255 | ||
2256 | static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp, | |
2257 | int *valp, | |
2258 | int write, void *data) | |
2259 | { | |
2260 | if (write) { | |
cba9f33d BS |
2261 | if (*lvalp > LONG_MAX / HZ) |
2262 | return 1; | |
1da177e4 LT |
2263 | *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ); |
2264 | } else { | |
2265 | int val = *valp; | |
2266 | unsigned long lval; | |
2267 | if (val < 0) { | |
2268 | *negp = -1; | |
2269 | lval = (unsigned long)-val; | |
2270 | } else { | |
2271 | *negp = 0; | |
2272 | lval = (unsigned long)val; | |
2273 | } | |
2274 | *lvalp = lval / HZ; | |
2275 | } | |
2276 | return 0; | |
2277 | } | |
2278 | ||
2279 | static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp, | |
2280 | int *valp, | |
2281 | int write, void *data) | |
2282 | { | |
2283 | if (write) { | |
cba9f33d BS |
2284 | if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ) |
2285 | return 1; | |
1da177e4 LT |
2286 | *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp); |
2287 | } else { | |
2288 | int val = *valp; | |
2289 | unsigned long lval; | |
2290 | if (val < 0) { | |
2291 | *negp = -1; | |
2292 | lval = (unsigned long)-val; | |
2293 | } else { | |
2294 | *negp = 0; | |
2295 | lval = (unsigned long)val; | |
2296 | } | |
2297 | *lvalp = jiffies_to_clock_t(lval); | |
2298 | } | |
2299 | return 0; | |
2300 | } | |
2301 | ||
2302 | static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp, | |
2303 | int *valp, | |
2304 | int write, void *data) | |
2305 | { | |
2306 | if (write) { | |
2307 | *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp); | |
2308 | } else { | |
2309 | int val = *valp; | |
2310 | unsigned long lval; | |
2311 | if (val < 0) { | |
2312 | *negp = -1; | |
2313 | lval = (unsigned long)-val; | |
2314 | } else { | |
2315 | *negp = 0; | |
2316 | lval = (unsigned long)val; | |
2317 | } | |
2318 | *lvalp = jiffies_to_msecs(lval); | |
2319 | } | |
2320 | return 0; | |
2321 | } | |
2322 | ||
2323 | /** | |
2324 | * proc_dointvec_jiffies - read a vector of integers as seconds | |
2325 | * @table: the sysctl table | |
2326 | * @write: %TRUE if this is a write to the sysctl file | |
2327 | * @filp: the file structure | |
2328 | * @buffer: the user buffer | |
2329 | * @lenp: the size of the user buffer | |
2330 | * @ppos: file position | |
2331 | * | |
2332 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer | |
2333 | * values from/to the user buffer, treated as an ASCII string. | |
2334 | * The values read are assumed to be in seconds, and are converted into | |
2335 | * jiffies. | |
2336 | * | |
2337 | * Returns 0 on success. | |
2338 | */ | |
2339 | int proc_dointvec_jiffies(ctl_table *table, int write, struct file *filp, | |
2340 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2341 | { | |
2342 | return do_proc_dointvec(table,write,filp,buffer,lenp,ppos, | |
2343 | do_proc_dointvec_jiffies_conv,NULL); | |
2344 | } | |
2345 | ||
2346 | /** | |
2347 | * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds | |
2348 | * @table: the sysctl table | |
2349 | * @write: %TRUE if this is a write to the sysctl file | |
2350 | * @filp: the file structure | |
2351 | * @buffer: the user buffer | |
2352 | * @lenp: the size of the user buffer | |
1e5d5331 | 2353 | * @ppos: pointer to the file position |
1da177e4 LT |
2354 | * |
2355 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer | |
2356 | * values from/to the user buffer, treated as an ASCII string. | |
2357 | * The values read are assumed to be in 1/USER_HZ seconds, and | |
2358 | * are converted into jiffies. | |
2359 | * | |
2360 | * Returns 0 on success. | |
2361 | */ | |
2362 | int proc_dointvec_userhz_jiffies(ctl_table *table, int write, struct file *filp, | |
2363 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2364 | { | |
2365 | return do_proc_dointvec(table,write,filp,buffer,lenp,ppos, | |
2366 | do_proc_dointvec_userhz_jiffies_conv,NULL); | |
2367 | } | |
2368 | ||
2369 | /** | |
2370 | * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds | |
2371 | * @table: the sysctl table | |
2372 | * @write: %TRUE if this is a write to the sysctl file | |
2373 | * @filp: the file structure | |
2374 | * @buffer: the user buffer | |
2375 | * @lenp: the size of the user buffer | |
67be2dd1 MW |
2376 | * @ppos: file position |
2377 | * @ppos: the current position in the file | |
1da177e4 LT |
2378 | * |
2379 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer | |
2380 | * values from/to the user buffer, treated as an ASCII string. | |
2381 | * The values read are assumed to be in 1/1000 seconds, and | |
2382 | * are converted into jiffies. | |
2383 | * | |
2384 | * Returns 0 on success. | |
2385 | */ | |
2386 | int proc_dointvec_ms_jiffies(ctl_table *table, int write, struct file *filp, | |
2387 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2388 | { | |
2389 | return do_proc_dointvec(table, write, filp, buffer, lenp, ppos, | |
2390 | do_proc_dointvec_ms_jiffies_conv, NULL); | |
2391 | } | |
2392 | ||
fcfbd547 KK |
2393 | #ifdef CONFIG_SYSVIPC |
2394 | static int proc_do_ipc_string(ctl_table *table, int write, struct file *filp, | |
2395 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2396 | { | |
2397 | void *data; | |
2398 | struct ipc_namespace *ns; | |
2399 | ||
2400 | ns = current->nsproxy->ipc_ns; | |
2401 | ||
2402 | switch (table->ctl_name) { | |
2403 | case KERN_SHMMAX: | |
2404 | data = &ns->shm_ctlmax; | |
2405 | goto proc_minmax; | |
2406 | case KERN_SHMALL: | |
2407 | data = &ns->shm_ctlall; | |
2408 | goto proc_minmax; | |
2409 | case KERN_SHMMNI: | |
2410 | data = &ns->shm_ctlmni; | |
2411 | break; | |
2412 | case KERN_MSGMAX: | |
2413 | data = &ns->msg_ctlmax; | |
2414 | break; | |
2415 | case KERN_MSGMNI: | |
2416 | data = &ns->msg_ctlmni; | |
2417 | break; | |
2418 | case KERN_MSGMNB: | |
2419 | data = &ns->msg_ctlmnb; | |
2420 | break; | |
2421 | case KERN_SEM: | |
2422 | data = &ns->sem_ctls; | |
2423 | break; | |
2424 | default: | |
2425 | return -EINVAL; | |
2426 | } | |
2427 | ||
2428 | return __do_proc_dointvec(data, table, write, filp, buffer, | |
2429 | lenp, ppos, NULL, NULL); | |
2430 | proc_minmax: | |
2431 | return __do_proc_doulongvec_minmax(data, table, write, filp, buffer, | |
2432 | lenp, ppos, 1l, 1l); | |
2433 | } | |
2434 | #endif | |
2435 | ||
9ec52099 CLG |
2436 | static int proc_do_cad_pid(ctl_table *table, int write, struct file *filp, |
2437 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2438 | { | |
2439 | struct pid *new_pid; | |
2440 | pid_t tmp; | |
2441 | int r; | |
2442 | ||
2443 | tmp = pid_nr(cad_pid); | |
2444 | ||
2445 | r = __do_proc_dointvec(&tmp, table, write, filp, buffer, | |
2446 | lenp, ppos, NULL, NULL); | |
2447 | if (r || !write) | |
2448 | return r; | |
2449 | ||
2450 | new_pid = find_get_pid(tmp); | |
2451 | if (!new_pid) | |
2452 | return -ESRCH; | |
2453 | ||
2454 | put_pid(xchg(&cad_pid, new_pid)); | |
2455 | return 0; | |
2456 | } | |
2457 | ||
1da177e4 LT |
2458 | #else /* CONFIG_PROC_FS */ |
2459 | ||
2460 | int proc_dostring(ctl_table *table, int write, struct file *filp, | |
2461 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2462 | { | |
2463 | return -ENOSYS; | |
2464 | } | |
2465 | ||
8218c74c SH |
2466 | static int proc_do_uts_string(ctl_table *table, int write, struct file *filp, |
2467 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
1da177e4 LT |
2468 | { |
2469 | return -ENOSYS; | |
2470 | } | |
2471 | ||
8218c74c SH |
2472 | #ifdef CONFIG_SYSVIPC |
2473 | static int proc_do_ipc_string(ctl_table *table, int write, struct file *filp, | |
2474 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2475 | { | |
2476 | return -ENOSYS; | |
2477 | } | |
2478 | #endif | |
2479 | ||
1da177e4 LT |
2480 | int proc_dointvec(ctl_table *table, int write, struct file *filp, |
2481 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2482 | { | |
2483 | return -ENOSYS; | |
2484 | } | |
2485 | ||
2486 | int proc_dointvec_bset(ctl_table *table, int write, struct file *filp, | |
2487 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2488 | { | |
2489 | return -ENOSYS; | |
2490 | } | |
2491 | ||
2492 | int proc_dointvec_minmax(ctl_table *table, int write, struct file *filp, | |
2493 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2494 | { | |
2495 | return -ENOSYS; | |
2496 | } | |
2497 | ||
2498 | int proc_dointvec_jiffies(ctl_table *table, int write, struct file *filp, | |
2499 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2500 | { | |
2501 | return -ENOSYS; | |
2502 | } | |
2503 | ||
2504 | int proc_dointvec_userhz_jiffies(ctl_table *table, int write, struct file *filp, | |
2505 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2506 | { | |
2507 | return -ENOSYS; | |
2508 | } | |
2509 | ||
2510 | int proc_dointvec_ms_jiffies(ctl_table *table, int write, struct file *filp, | |
2511 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2512 | { | |
2513 | return -ENOSYS; | |
2514 | } | |
2515 | ||
2516 | int proc_doulongvec_minmax(ctl_table *table, int write, struct file *filp, | |
2517 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2518 | { | |
2519 | return -ENOSYS; | |
2520 | } | |
2521 | ||
2522 | int proc_doulongvec_ms_jiffies_minmax(ctl_table *table, int write, | |
2523 | struct file *filp, | |
2524 | void __user *buffer, | |
2525 | size_t *lenp, loff_t *ppos) | |
2526 | { | |
2527 | return -ENOSYS; | |
2528 | } | |
2529 | ||
2530 | ||
2531 | #endif /* CONFIG_PROC_FS */ | |
2532 | ||
2533 | ||
b89a8171 | 2534 | #ifdef CONFIG_SYSCTL_SYSCALL |
1da177e4 LT |
2535 | /* |
2536 | * General sysctl support routines | |
2537 | */ | |
2538 | ||
2539 | /* The generic string strategy routine: */ | |
2540 | int sysctl_string(ctl_table *table, int __user *name, int nlen, | |
2541 | void __user *oldval, size_t __user *oldlenp, | |
2542 | void __user *newval, size_t newlen, void **context) | |
2543 | { | |
1da177e4 LT |
2544 | if (!table->data || !table->maxlen) |
2545 | return -ENOTDIR; | |
2546 | ||
2547 | if (oldval && oldlenp) { | |
de9e007d LT |
2548 | size_t bufsize; |
2549 | if (get_user(bufsize, oldlenp)) | |
1da177e4 | 2550 | return -EFAULT; |
de9e007d LT |
2551 | if (bufsize) { |
2552 | size_t len = strlen(table->data), copied; | |
2553 | ||
2554 | /* This shouldn't trigger for a well-formed sysctl */ | |
2555 | if (len > table->maxlen) | |
1da177e4 | 2556 | len = table->maxlen; |
de9e007d LT |
2557 | |
2558 | /* Copy up to a max of bufsize-1 bytes of the string */ | |
2559 | copied = (len >= bufsize) ? bufsize - 1 : len; | |
2560 | ||
2561 | if (copy_to_user(oldval, table->data, copied) || | |
2562 | put_user(0, (char __user *)(oldval + copied))) | |
1da177e4 | 2563 | return -EFAULT; |
de9e007d | 2564 | if (put_user(len, oldlenp)) |
1da177e4 LT |
2565 | return -EFAULT; |
2566 | } | |
2567 | } | |
2568 | if (newval && newlen) { | |
de9e007d | 2569 | size_t len = newlen; |
1da177e4 LT |
2570 | if (len > table->maxlen) |
2571 | len = table->maxlen; | |
2572 | if(copy_from_user(table->data, newval, len)) | |
2573 | return -EFAULT; | |
2574 | if (len == table->maxlen) | |
2575 | len--; | |
2576 | ((char *) table->data)[len] = 0; | |
2577 | } | |
82c9df82 | 2578 | return 1; |
1da177e4 LT |
2579 | } |
2580 | ||
2581 | /* | |
2582 | * This function makes sure that all of the integers in the vector | |
2583 | * are between the minimum and maximum values given in the arrays | |
2584 | * table->extra1 and table->extra2, respectively. | |
2585 | */ | |
2586 | int sysctl_intvec(ctl_table *table, int __user *name, int nlen, | |
2587 | void __user *oldval, size_t __user *oldlenp, | |
2588 | void __user *newval, size_t newlen, void **context) | |
2589 | { | |
2590 | ||
2591 | if (newval && newlen) { | |
2592 | int __user *vec = (int __user *) newval; | |
2593 | int *min = (int *) table->extra1; | |
2594 | int *max = (int *) table->extra2; | |
2595 | size_t length; | |
2596 | int i; | |
2597 | ||
2598 | if (newlen % sizeof(int) != 0) | |
2599 | return -EINVAL; | |
2600 | ||
2601 | if (!table->extra1 && !table->extra2) | |
2602 | return 0; | |
2603 | ||
2604 | if (newlen > table->maxlen) | |
2605 | newlen = table->maxlen; | |
2606 | length = newlen / sizeof(int); | |
2607 | ||
2608 | for (i = 0; i < length; i++) { | |
2609 | int value; | |
2610 | if (get_user(value, vec + i)) | |
2611 | return -EFAULT; | |
2612 | if (min && value < min[i]) | |
2613 | return -EINVAL; | |
2614 | if (max && value > max[i]) | |
2615 | return -EINVAL; | |
2616 | } | |
2617 | } | |
2618 | return 0; | |
2619 | } | |
2620 | ||
2621 | /* Strategy function to convert jiffies to seconds */ | |
2622 | int sysctl_jiffies(ctl_table *table, int __user *name, int nlen, | |
2623 | void __user *oldval, size_t __user *oldlenp, | |
2624 | void __user *newval, size_t newlen, void **context) | |
2625 | { | |
2626 | if (oldval) { | |
2627 | size_t olen; | |
2628 | if (oldlenp) { | |
2629 | if (get_user(olen, oldlenp)) | |
2630 | return -EFAULT; | |
2631 | if (olen!=sizeof(int)) | |
2632 | return -EINVAL; | |
2633 | } | |
2634 | if (put_user(*(int *)(table->data)/HZ, (int __user *)oldval) || | |
2635 | (oldlenp && put_user(sizeof(int),oldlenp))) | |
2636 | return -EFAULT; | |
2637 | } | |
2638 | if (newval && newlen) { | |
2639 | int new; | |
2640 | if (newlen != sizeof(int)) | |
2641 | return -EINVAL; | |
2642 | if (get_user(new, (int __user *)newval)) | |
2643 | return -EFAULT; | |
2644 | *(int *)(table->data) = new*HZ; | |
2645 | } | |
2646 | return 1; | |
2647 | } | |
2648 | ||
2649 | /* Strategy function to convert jiffies to seconds */ | |
2650 | int sysctl_ms_jiffies(ctl_table *table, int __user *name, int nlen, | |
2651 | void __user *oldval, size_t __user *oldlenp, | |
2652 | void __user *newval, size_t newlen, void **context) | |
2653 | { | |
2654 | if (oldval) { | |
2655 | size_t olen; | |
2656 | if (oldlenp) { | |
2657 | if (get_user(olen, oldlenp)) | |
2658 | return -EFAULT; | |
2659 | if (olen!=sizeof(int)) | |
2660 | return -EINVAL; | |
2661 | } | |
2662 | if (put_user(jiffies_to_msecs(*(int *)(table->data)), (int __user *)oldval) || | |
2663 | (oldlenp && put_user(sizeof(int),oldlenp))) | |
2664 | return -EFAULT; | |
2665 | } | |
2666 | if (newval && newlen) { | |
2667 | int new; | |
2668 | if (newlen != sizeof(int)) | |
2669 | return -EINVAL; | |
2670 | if (get_user(new, (int __user *)newval)) | |
2671 | return -EFAULT; | |
2672 | *(int *)(table->data) = msecs_to_jiffies(new); | |
2673 | } | |
2674 | return 1; | |
2675 | } | |
2676 | ||
b89a8171 | 2677 | #else /* CONFIG_SYSCTL_SYSCALL */ |
1da177e4 LT |
2678 | |
2679 | ||
2680 | asmlinkage long sys_sysctl(struct __sysctl_args __user *args) | |
2681 | { | |
b89a8171 | 2682 | static int msg_count; |
0e009be8 EB |
2683 | struct __sysctl_args tmp; |
2684 | int name[CTL_MAXNAME]; | |
2685 | int i; | |
2686 | ||
2687 | /* Read in the sysctl name for better debug message logging */ | |
2688 | if (copy_from_user(&tmp, args, sizeof(tmp))) | |
2689 | return -EFAULT; | |
2690 | if (tmp.nlen <= 0 || tmp.nlen >= CTL_MAXNAME) | |
2691 | return -ENOTDIR; | |
2692 | for (i = 0; i < tmp.nlen; i++) | |
2693 | if (get_user(name[i], tmp.name + i)) | |
2694 | return -EFAULT; | |
2695 | ||
2696 | /* Ignore accesses to kernel.version */ | |
2697 | if ((tmp.nlen == 2) && (name[0] == CTL_KERN) && (name[1] == KERN_VERSION)) | |
2698 | goto out; | |
b89a8171 EB |
2699 | |
2700 | if (msg_count < 5) { | |
2701 | msg_count++; | |
2702 | printk(KERN_INFO | |
2703 | "warning: process `%s' used the removed sysctl " | |
0e009be8 EB |
2704 | "system call with ", current->comm); |
2705 | for (i = 0; i < tmp.nlen; i++) | |
2706 | printk("%d.", name[i]); | |
2707 | printk("\n"); | |
b89a8171 | 2708 | } |
0e009be8 | 2709 | out: |
1da177e4 LT |
2710 | return -ENOSYS; |
2711 | } | |
2712 | ||
2713 | int sysctl_string(ctl_table *table, int __user *name, int nlen, | |
2714 | void __user *oldval, size_t __user *oldlenp, | |
2715 | void __user *newval, size_t newlen, void **context) | |
2716 | { | |
2717 | return -ENOSYS; | |
2718 | } | |
2719 | ||
2720 | int sysctl_intvec(ctl_table *table, int __user *name, int nlen, | |
2721 | void __user *oldval, size_t __user *oldlenp, | |
2722 | void __user *newval, size_t newlen, void **context) | |
2723 | { | |
2724 | return -ENOSYS; | |
2725 | } | |
2726 | ||
2727 | int sysctl_jiffies(ctl_table *table, int __user *name, int nlen, | |
2728 | void __user *oldval, size_t __user *oldlenp, | |
2729 | void __user *newval, size_t newlen, void **context) | |
2730 | { | |
2731 | return -ENOSYS; | |
2732 | } | |
2733 | ||
2734 | int sysctl_ms_jiffies(ctl_table *table, int __user *name, int nlen, | |
2735 | void __user *oldval, size_t __user *oldlenp, | |
2736 | void __user *newval, size_t newlen, void **context) | |
2737 | { | |
2738 | return -ENOSYS; | |
2739 | } | |
2740 | ||
b89a8171 | 2741 | #endif /* CONFIG_SYSCTL_SYSCALL */ |
1da177e4 LT |
2742 | |
2743 | /* | |
2744 | * No sense putting this after each symbol definition, twice, | |
2745 | * exception granted :-) | |
2746 | */ | |
2747 | EXPORT_SYMBOL(proc_dointvec); | |
2748 | EXPORT_SYMBOL(proc_dointvec_jiffies); | |
2749 | EXPORT_SYMBOL(proc_dointvec_minmax); | |
2750 | EXPORT_SYMBOL(proc_dointvec_userhz_jiffies); | |
2751 | EXPORT_SYMBOL(proc_dointvec_ms_jiffies); | |
2752 | EXPORT_SYMBOL(proc_dostring); | |
2753 | EXPORT_SYMBOL(proc_doulongvec_minmax); | |
2754 | EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax); | |
2755 | EXPORT_SYMBOL(register_sysctl_table); | |
2756 | EXPORT_SYMBOL(sysctl_intvec); | |
2757 | EXPORT_SYMBOL(sysctl_jiffies); | |
2758 | EXPORT_SYMBOL(sysctl_ms_jiffies); | |
2759 | EXPORT_SYMBOL(sysctl_string); | |
2760 | EXPORT_SYMBOL(unregister_sysctl_table); |