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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> | |
1da177e4 | 30 | #include <linux/smp_lock.h> |
62239ac2 | 31 | #include <linux/fs.h> |
1da177e4 LT |
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> | |
10a0a8d4 | 48 | #include <linux/reboot.h> |
1da177e4 LT |
49 | |
50 | #include <asm/uaccess.h> | |
51 | #include <asm/processor.h> | |
52 | ||
29cbc78b AK |
53 | #ifdef CONFIG_X86 |
54 | #include <asm/nmi.h> | |
0741f4d2 | 55 | #include <asm/stacktrace.h> |
29cbc78b AK |
56 | #endif |
57 | ||
1da177e4 LT |
58 | #if defined(CONFIG_SYSCTL) |
59 | ||
60 | /* External variables not in a header file. */ | |
61 | extern int C_A_D; | |
45807a1d | 62 | extern int print_fatal_signals; |
1da177e4 LT |
63 | extern int sysctl_overcommit_memory; |
64 | extern int sysctl_overcommit_ratio; | |
fadd8fbd | 65 | extern int sysctl_panic_on_oom; |
fe071d7e | 66 | extern int sysctl_oom_kill_allocating_task; |
1da177e4 | 67 | extern int max_threads; |
1da177e4 | 68 | extern int core_uses_pid; |
d6e71144 | 69 | extern int suid_dumpable; |
1da177e4 | 70 | extern char core_pattern[]; |
1da177e4 LT |
71 | extern int pid_max; |
72 | extern int min_free_kbytes; | |
73 | extern int printk_ratelimit_jiffies; | |
74 | extern int printk_ratelimit_burst; | |
75 | extern int pid_max_min, pid_max_max; | |
9d0243bc | 76 | extern int sysctl_drop_caches; |
8ad4b1fb | 77 | extern int percpu_pagelist_fraction; |
bebfa101 | 78 | extern int compat_log; |
5096add8 | 79 | extern int maps_protect; |
77461ab3 | 80 | extern int sysctl_stat_interval; |
bdf4c48a | 81 | extern int audit_argv_kb; |
1da177e4 | 82 | |
c4f3b63f RT |
83 | /* Constants used for minimum and maximum */ |
84 | #ifdef CONFIG_DETECT_SOFTLOCKUP | |
85 | static int one = 1; | |
86 | static int sixty = 60; | |
87 | #endif | |
88 | ||
89 | #ifdef CONFIG_MMU | |
90 | static int two = 2; | |
91 | #endif | |
92 | ||
93 | static int zero; | |
94 | static int one_hundred = 100; | |
95 | ||
1da177e4 LT |
96 | /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */ |
97 | static int maxolduid = 65535; | |
98 | static int minolduid; | |
8ad4b1fb | 99 | static int min_percpu_pagelist_fract = 8; |
1da177e4 LT |
100 | |
101 | static int ngroups_max = NGROUPS_MAX; | |
102 | ||
103 | #ifdef CONFIG_KMOD | |
104 | extern char modprobe_path[]; | |
105 | #endif | |
1da177e4 LT |
106 | #ifdef CONFIG_CHR_DEV_SG |
107 | extern int sg_big_buff; | |
108 | #endif | |
1da177e4 LT |
109 | |
110 | #ifdef __sparc__ | |
111 | extern char reboot_command []; | |
112 | extern int stop_a_enabled; | |
113 | extern int scons_pwroff; | |
114 | #endif | |
115 | ||
116 | #ifdef __hppa__ | |
117 | extern int pwrsw_enabled; | |
118 | extern int unaligned_enabled; | |
119 | #endif | |
120 | ||
347a8dc3 | 121 | #ifdef CONFIG_S390 |
1da177e4 LT |
122 | #ifdef CONFIG_MATHEMU |
123 | extern int sysctl_ieee_emulation_warnings; | |
124 | #endif | |
125 | extern int sysctl_userprocess_debug; | |
951f22d5 | 126 | extern int spin_retry; |
1da177e4 LT |
127 | #endif |
128 | ||
129 | extern int sysctl_hz_timer; | |
130 | ||
131 | #ifdef CONFIG_BSD_PROCESS_ACCT | |
132 | extern int acct_parm[]; | |
133 | #endif | |
134 | ||
d2b176ed JS |
135 | #ifdef CONFIG_IA64 |
136 | extern int no_unaligned_warning; | |
137 | #endif | |
138 | ||
23f78d4a IM |
139 | #ifdef CONFIG_RT_MUTEXES |
140 | extern int max_lock_depth; | |
141 | #endif | |
142 | ||
b89a8171 EB |
143 | #ifdef CONFIG_SYSCTL_SYSCALL |
144 | static int parse_table(int __user *, int, void __user *, size_t __user *, | |
1f29bcd7 | 145 | void __user *, size_t, ctl_table *); |
b89a8171 EB |
146 | #endif |
147 | ||
6b49a257 | 148 | |
d6f8ff73 | 149 | #ifdef CONFIG_PROC_SYSCTL |
9ec52099 CLG |
150 | static int proc_do_cad_pid(ctl_table *table, int write, struct file *filp, |
151 | void __user *buffer, size_t *lenp, loff_t *ppos); | |
34f5a398 TT |
152 | static int proc_dointvec_taint(ctl_table *table, int write, struct file *filp, |
153 | void __user *buffer, size_t *lenp, loff_t *ppos); | |
d6f8ff73 | 154 | #endif |
9ec52099 | 155 | |
1da177e4 LT |
156 | static ctl_table root_table[]; |
157 | static struct ctl_table_header root_table_header = | |
158 | { root_table, LIST_HEAD_INIT(root_table_header.ctl_entry) }; | |
159 | ||
160 | static ctl_table kern_table[]; | |
161 | static ctl_table vm_table[]; | |
1da177e4 LT |
162 | static ctl_table fs_table[]; |
163 | static ctl_table debug_table[]; | |
164 | static ctl_table dev_table[]; | |
165 | extern ctl_table random_table[]; | |
166 | #ifdef CONFIG_UNIX98_PTYS | |
167 | extern ctl_table pty_table[]; | |
168 | #endif | |
2d9048e2 | 169 | #ifdef CONFIG_INOTIFY_USER |
0399cb08 RL |
170 | extern ctl_table inotify_table[]; |
171 | #endif | |
1da177e4 LT |
172 | |
173 | #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT | |
174 | int sysctl_legacy_va_layout; | |
175 | #endif | |
176 | ||
f20786ff PZ |
177 | extern int prove_locking; |
178 | extern int lock_stat; | |
9bc9a6bd | 179 | |
1da177e4 LT |
180 | /* The default sysctl tables: */ |
181 | ||
182 | static ctl_table root_table[] = { | |
183 | { | |
184 | .ctl_name = CTL_KERN, | |
185 | .procname = "kernel", | |
186 | .mode = 0555, | |
187 | .child = kern_table, | |
188 | }, | |
189 | { | |
190 | .ctl_name = CTL_VM, | |
191 | .procname = "vm", | |
192 | .mode = 0555, | |
193 | .child = vm_table, | |
194 | }, | |
195 | #ifdef CONFIG_NET | |
196 | { | |
197 | .ctl_name = CTL_NET, | |
198 | .procname = "net", | |
199 | .mode = 0555, | |
200 | .child = net_table, | |
201 | }, | |
202 | #endif | |
1da177e4 LT |
203 | { |
204 | .ctl_name = CTL_FS, | |
205 | .procname = "fs", | |
206 | .mode = 0555, | |
207 | .child = fs_table, | |
208 | }, | |
209 | { | |
210 | .ctl_name = CTL_DEBUG, | |
211 | .procname = "debug", | |
212 | .mode = 0555, | |
213 | .child = debug_table, | |
214 | }, | |
215 | { | |
216 | .ctl_name = CTL_DEV, | |
217 | .procname = "dev", | |
218 | .mode = 0555, | |
219 | .child = dev_table, | |
220 | }, | |
2be7fe07 AM |
221 | /* |
222 | * NOTE: do not add new entries to this table unless you have read | |
223 | * Documentation/sysctl/ctl_unnumbered.txt | |
224 | */ | |
1da177e4 LT |
225 | { .ctl_name = 0 } |
226 | }; | |
227 | ||
77e54a1f IM |
228 | #ifdef CONFIG_SCHED_DEBUG |
229 | static unsigned long min_sched_granularity_ns = 100000; /* 100 usecs */ | |
230 | static unsigned long max_sched_granularity_ns = 1000000000; /* 1 second */ | |
231 | static unsigned long min_wakeup_granularity_ns; /* 0 usecs */ | |
232 | static unsigned long max_wakeup_granularity_ns = 1000000000; /* 1 second */ | |
233 | #endif | |
234 | ||
1da177e4 | 235 | static ctl_table kern_table[] = { |
77e54a1f IM |
236 | #ifdef CONFIG_SCHED_DEBUG |
237 | { | |
238 | .ctl_name = CTL_UNNUMBERED, | |
5f6d858e PZ |
239 | .procname = "sched_nr_latency", |
240 | .data = &sysctl_sched_nr_latency, | |
77e54a1f IM |
241 | .maxlen = sizeof(unsigned int), |
242 | .mode = 0644, | |
5f6d858e | 243 | .proc_handler = &proc_dointvec, |
77e54a1f | 244 | }, |
21805085 PZ |
245 | { |
246 | .ctl_name = CTL_UNNUMBERED, | |
247 | .procname = "sched_latency_ns", | |
248 | .data = &sysctl_sched_latency, | |
249 | .maxlen = sizeof(unsigned int), | |
250 | .mode = 0644, | |
251 | .proc_handler = &proc_dointvec_minmax, | |
252 | .strategy = &sysctl_intvec, | |
253 | .extra1 = &min_sched_granularity_ns, | |
254 | .extra2 = &max_sched_granularity_ns, | |
255 | }, | |
77e54a1f IM |
256 | { |
257 | .ctl_name = CTL_UNNUMBERED, | |
258 | .procname = "sched_wakeup_granularity_ns", | |
259 | .data = &sysctl_sched_wakeup_granularity, | |
260 | .maxlen = sizeof(unsigned int), | |
261 | .mode = 0644, | |
262 | .proc_handler = &proc_dointvec_minmax, | |
263 | .strategy = &sysctl_intvec, | |
264 | .extra1 = &min_wakeup_granularity_ns, | |
265 | .extra2 = &max_wakeup_granularity_ns, | |
266 | }, | |
267 | { | |
268 | .ctl_name = CTL_UNNUMBERED, | |
269 | .procname = "sched_batch_wakeup_granularity_ns", | |
270 | .data = &sysctl_sched_batch_wakeup_granularity, | |
271 | .maxlen = sizeof(unsigned int), | |
272 | .mode = 0644, | |
273 | .proc_handler = &proc_dointvec_minmax, | |
274 | .strategy = &sysctl_intvec, | |
275 | .extra1 = &min_wakeup_granularity_ns, | |
276 | .extra2 = &max_wakeup_granularity_ns, | |
277 | }, | |
77e54a1f IM |
278 | { |
279 | .ctl_name = CTL_UNNUMBERED, | |
280 | .procname = "sched_child_runs_first", | |
281 | .data = &sysctl_sched_child_runs_first, | |
282 | .maxlen = sizeof(unsigned int), | |
283 | .mode = 0644, | |
284 | .proc_handler = &proc_dointvec, | |
285 | }, | |
1fc84aaa PZ |
286 | { |
287 | .ctl_name = CTL_UNNUMBERED, | |
288 | .procname = "sched_features", | |
289 | .data = &sysctl_sched_features, | |
290 | .maxlen = sizeof(unsigned int), | |
291 | .mode = 0644, | |
292 | .proc_handler = &proc_dointvec, | |
293 | }, | |
da84d961 IM |
294 | { |
295 | .ctl_name = CTL_UNNUMBERED, | |
296 | .procname = "sched_migration_cost", | |
297 | .data = &sysctl_sched_migration_cost, | |
298 | .maxlen = sizeof(unsigned int), | |
299 | .mode = 0644, | |
300 | .proc_handler = &proc_dointvec, | |
301 | }, | |
1fc84aaa | 302 | #endif |
1799e35d IM |
303 | { |
304 | .ctl_name = CTL_UNNUMBERED, | |
305 | .procname = "sched_compat_yield", | |
306 | .data = &sysctl_sched_compat_yield, | |
307 | .maxlen = sizeof(unsigned int), | |
308 | .mode = 0644, | |
309 | .proc_handler = &proc_dointvec, | |
310 | }, | |
f20786ff PZ |
311 | #ifdef CONFIG_PROVE_LOCKING |
312 | { | |
313 | .ctl_name = CTL_UNNUMBERED, | |
314 | .procname = "prove_locking", | |
315 | .data = &prove_locking, | |
316 | .maxlen = sizeof(int), | |
317 | .mode = 0644, | |
318 | .proc_handler = &proc_dointvec, | |
319 | }, | |
320 | #endif | |
321 | #ifdef CONFIG_LOCK_STAT | |
322 | { | |
323 | .ctl_name = CTL_UNNUMBERED, | |
324 | .procname = "lock_stat", | |
325 | .data = &lock_stat, | |
326 | .maxlen = sizeof(int), | |
327 | .mode = 0644, | |
328 | .proc_handler = &proc_dointvec, | |
329 | }, | |
77e54a1f | 330 | #endif |
1da177e4 LT |
331 | { |
332 | .ctl_name = KERN_PANIC, | |
333 | .procname = "panic", | |
334 | .data = &panic_timeout, | |
335 | .maxlen = sizeof(int), | |
336 | .mode = 0644, | |
337 | .proc_handler = &proc_dointvec, | |
338 | }, | |
339 | { | |
340 | .ctl_name = KERN_CORE_USES_PID, | |
341 | .procname = "core_uses_pid", | |
342 | .data = &core_uses_pid, | |
343 | .maxlen = sizeof(int), | |
344 | .mode = 0644, | |
345 | .proc_handler = &proc_dointvec, | |
346 | }, | |
bdf4c48a PZ |
347 | #ifdef CONFIG_AUDITSYSCALL |
348 | { | |
349 | .ctl_name = CTL_UNNUMBERED, | |
350 | .procname = "audit_argv_kb", | |
351 | .data = &audit_argv_kb, | |
352 | .maxlen = sizeof(int), | |
353 | .mode = 0644, | |
354 | .proc_handler = &proc_dointvec, | |
355 | }, | |
356 | #endif | |
1da177e4 LT |
357 | { |
358 | .ctl_name = KERN_CORE_PATTERN, | |
359 | .procname = "core_pattern", | |
360 | .data = core_pattern, | |
71ce92f3 | 361 | .maxlen = CORENAME_MAX_SIZE, |
1da177e4 LT |
362 | .mode = 0644, |
363 | .proc_handler = &proc_dostring, | |
364 | .strategy = &sysctl_string, | |
365 | }, | |
34f5a398 | 366 | #ifdef CONFIG_PROC_SYSCTL |
1da177e4 LT |
367 | { |
368 | .ctl_name = KERN_TAINTED, | |
369 | .procname = "tainted", | |
370 | .data = &tainted, | |
371 | .maxlen = sizeof(int), | |
34f5a398 TT |
372 | .mode = 0644, |
373 | .proc_handler = &proc_dointvec_taint, | |
1da177e4 | 374 | }, |
34f5a398 | 375 | #endif |
1da177e4 LT |
376 | { |
377 | .ctl_name = KERN_CAP_BSET, | |
378 | .procname = "cap-bound", | |
379 | .data = &cap_bset, | |
380 | .maxlen = sizeof(kernel_cap_t), | |
381 | .mode = 0600, | |
382 | .proc_handler = &proc_dointvec_bset, | |
383 | }, | |
384 | #ifdef CONFIG_BLK_DEV_INITRD | |
385 | { | |
386 | .ctl_name = KERN_REALROOTDEV, | |
387 | .procname = "real-root-dev", | |
388 | .data = &real_root_dev, | |
389 | .maxlen = sizeof(int), | |
390 | .mode = 0644, | |
391 | .proc_handler = &proc_dointvec, | |
392 | }, | |
393 | #endif | |
45807a1d IM |
394 | { |
395 | .ctl_name = CTL_UNNUMBERED, | |
396 | .procname = "print-fatal-signals", | |
397 | .data = &print_fatal_signals, | |
398 | .maxlen = sizeof(int), | |
399 | .mode = 0644, | |
400 | .proc_handler = &proc_dointvec, | |
401 | }, | |
1da177e4 LT |
402 | #ifdef __sparc__ |
403 | { | |
404 | .ctl_name = KERN_SPARC_REBOOT, | |
405 | .procname = "reboot-cmd", | |
406 | .data = reboot_command, | |
407 | .maxlen = 256, | |
408 | .mode = 0644, | |
409 | .proc_handler = &proc_dostring, | |
410 | .strategy = &sysctl_string, | |
411 | }, | |
412 | { | |
413 | .ctl_name = KERN_SPARC_STOP_A, | |
414 | .procname = "stop-a", | |
415 | .data = &stop_a_enabled, | |
416 | .maxlen = sizeof (int), | |
417 | .mode = 0644, | |
418 | .proc_handler = &proc_dointvec, | |
419 | }, | |
420 | { | |
421 | .ctl_name = KERN_SPARC_SCONS_PWROFF, | |
422 | .procname = "scons-poweroff", | |
423 | .data = &scons_pwroff, | |
424 | .maxlen = sizeof (int), | |
425 | .mode = 0644, | |
426 | .proc_handler = &proc_dointvec, | |
427 | }, | |
428 | #endif | |
429 | #ifdef __hppa__ | |
430 | { | |
431 | .ctl_name = KERN_HPPA_PWRSW, | |
432 | .procname = "soft-power", | |
433 | .data = &pwrsw_enabled, | |
434 | .maxlen = sizeof (int), | |
435 | .mode = 0644, | |
436 | .proc_handler = &proc_dointvec, | |
437 | }, | |
438 | { | |
439 | .ctl_name = KERN_HPPA_UNALIGNED, | |
440 | .procname = "unaligned-trap", | |
441 | .data = &unaligned_enabled, | |
442 | .maxlen = sizeof (int), | |
443 | .mode = 0644, | |
444 | .proc_handler = &proc_dointvec, | |
445 | }, | |
446 | #endif | |
447 | { | |
448 | .ctl_name = KERN_CTLALTDEL, | |
449 | .procname = "ctrl-alt-del", | |
450 | .data = &C_A_D, | |
451 | .maxlen = sizeof(int), | |
452 | .mode = 0644, | |
453 | .proc_handler = &proc_dointvec, | |
454 | }, | |
455 | { | |
456 | .ctl_name = KERN_PRINTK, | |
457 | .procname = "printk", | |
458 | .data = &console_loglevel, | |
459 | .maxlen = 4*sizeof(int), | |
460 | .mode = 0644, | |
461 | .proc_handler = &proc_dointvec, | |
462 | }, | |
463 | #ifdef CONFIG_KMOD | |
464 | { | |
465 | .ctl_name = KERN_MODPROBE, | |
466 | .procname = "modprobe", | |
467 | .data = &modprobe_path, | |
468 | .maxlen = KMOD_PATH_LEN, | |
469 | .mode = 0644, | |
470 | .proc_handler = &proc_dostring, | |
471 | .strategy = &sysctl_string, | |
472 | }, | |
473 | #endif | |
57ae2508 | 474 | #if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET) |
1da177e4 LT |
475 | { |
476 | .ctl_name = KERN_HOTPLUG, | |
477 | .procname = "hotplug", | |
312c004d KS |
478 | .data = &uevent_helper, |
479 | .maxlen = UEVENT_HELPER_PATH_LEN, | |
1da177e4 LT |
480 | .mode = 0644, |
481 | .proc_handler = &proc_dostring, | |
482 | .strategy = &sysctl_string, | |
483 | }, | |
484 | #endif | |
485 | #ifdef CONFIG_CHR_DEV_SG | |
486 | { | |
487 | .ctl_name = KERN_SG_BIG_BUFF, | |
488 | .procname = "sg-big-buff", | |
489 | .data = &sg_big_buff, | |
490 | .maxlen = sizeof (int), | |
491 | .mode = 0444, | |
492 | .proc_handler = &proc_dointvec, | |
493 | }, | |
494 | #endif | |
495 | #ifdef CONFIG_BSD_PROCESS_ACCT | |
496 | { | |
497 | .ctl_name = KERN_ACCT, | |
498 | .procname = "acct", | |
499 | .data = &acct_parm, | |
500 | .maxlen = 3*sizeof(int), | |
501 | .mode = 0644, | |
502 | .proc_handler = &proc_dointvec, | |
503 | }, | |
504 | #endif | |
1da177e4 LT |
505 | #ifdef CONFIG_MAGIC_SYSRQ |
506 | { | |
507 | .ctl_name = KERN_SYSRQ, | |
508 | .procname = "sysrq", | |
5d6f647f | 509 | .data = &__sysrq_enabled, |
1da177e4 LT |
510 | .maxlen = sizeof (int), |
511 | .mode = 0644, | |
512 | .proc_handler = &proc_dointvec, | |
513 | }, | |
514 | #endif | |
d6f8ff73 | 515 | #ifdef CONFIG_PROC_SYSCTL |
1da177e4 LT |
516 | { |
517 | .ctl_name = KERN_CADPID, | |
518 | .procname = "cad_pid", | |
9ec52099 | 519 | .data = NULL, |
1da177e4 LT |
520 | .maxlen = sizeof (int), |
521 | .mode = 0600, | |
9ec52099 | 522 | .proc_handler = &proc_do_cad_pid, |
1da177e4 | 523 | }, |
d6f8ff73 | 524 | #endif |
1da177e4 LT |
525 | { |
526 | .ctl_name = KERN_MAX_THREADS, | |
527 | .procname = "threads-max", | |
528 | .data = &max_threads, | |
529 | .maxlen = sizeof(int), | |
530 | .mode = 0644, | |
531 | .proc_handler = &proc_dointvec, | |
532 | }, | |
533 | { | |
534 | .ctl_name = KERN_RANDOM, | |
535 | .procname = "random", | |
536 | .mode = 0555, | |
537 | .child = random_table, | |
538 | }, | |
539 | #ifdef CONFIG_UNIX98_PTYS | |
540 | { | |
541 | .ctl_name = KERN_PTY, | |
542 | .procname = "pty", | |
543 | .mode = 0555, | |
544 | .child = pty_table, | |
545 | }, | |
546 | #endif | |
547 | { | |
548 | .ctl_name = KERN_OVERFLOWUID, | |
549 | .procname = "overflowuid", | |
550 | .data = &overflowuid, | |
551 | .maxlen = sizeof(int), | |
552 | .mode = 0644, | |
553 | .proc_handler = &proc_dointvec_minmax, | |
554 | .strategy = &sysctl_intvec, | |
555 | .extra1 = &minolduid, | |
556 | .extra2 = &maxolduid, | |
557 | }, | |
558 | { | |
559 | .ctl_name = KERN_OVERFLOWGID, | |
560 | .procname = "overflowgid", | |
561 | .data = &overflowgid, | |
562 | .maxlen = sizeof(int), | |
563 | .mode = 0644, | |
564 | .proc_handler = &proc_dointvec_minmax, | |
565 | .strategy = &sysctl_intvec, | |
566 | .extra1 = &minolduid, | |
567 | .extra2 = &maxolduid, | |
568 | }, | |
347a8dc3 | 569 | #ifdef CONFIG_S390 |
1da177e4 LT |
570 | #ifdef CONFIG_MATHEMU |
571 | { | |
572 | .ctl_name = KERN_IEEE_EMULATION_WARNINGS, | |
573 | .procname = "ieee_emulation_warnings", | |
574 | .data = &sysctl_ieee_emulation_warnings, | |
575 | .maxlen = sizeof(int), | |
576 | .mode = 0644, | |
577 | .proc_handler = &proc_dointvec, | |
578 | }, | |
579 | #endif | |
580 | #ifdef CONFIG_NO_IDLE_HZ | |
581 | { | |
582 | .ctl_name = KERN_HZ_TIMER, | |
583 | .procname = "hz_timer", | |
584 | .data = &sysctl_hz_timer, | |
585 | .maxlen = sizeof(int), | |
586 | .mode = 0644, | |
587 | .proc_handler = &proc_dointvec, | |
588 | }, | |
589 | #endif | |
590 | { | |
591 | .ctl_name = KERN_S390_USER_DEBUG_LOGGING, | |
592 | .procname = "userprocess_debug", | |
593 | .data = &sysctl_userprocess_debug, | |
594 | .maxlen = sizeof(int), | |
595 | .mode = 0644, | |
596 | .proc_handler = &proc_dointvec, | |
597 | }, | |
598 | #endif | |
599 | { | |
600 | .ctl_name = KERN_PIDMAX, | |
601 | .procname = "pid_max", | |
602 | .data = &pid_max, | |
603 | .maxlen = sizeof (int), | |
604 | .mode = 0644, | |
605 | .proc_handler = &proc_dointvec_minmax, | |
606 | .strategy = sysctl_intvec, | |
607 | .extra1 = &pid_max_min, | |
608 | .extra2 = &pid_max_max, | |
609 | }, | |
610 | { | |
611 | .ctl_name = KERN_PANIC_ON_OOPS, | |
612 | .procname = "panic_on_oops", | |
613 | .data = &panic_on_oops, | |
614 | .maxlen = sizeof(int), | |
615 | .mode = 0644, | |
616 | .proc_handler = &proc_dointvec, | |
617 | }, | |
618 | { | |
619 | .ctl_name = KERN_PRINTK_RATELIMIT, | |
620 | .procname = "printk_ratelimit", | |
621 | .data = &printk_ratelimit_jiffies, | |
622 | .maxlen = sizeof(int), | |
623 | .mode = 0644, | |
624 | .proc_handler = &proc_dointvec_jiffies, | |
625 | .strategy = &sysctl_jiffies, | |
626 | }, | |
627 | { | |
628 | .ctl_name = KERN_PRINTK_RATELIMIT_BURST, | |
629 | .procname = "printk_ratelimit_burst", | |
630 | .data = &printk_ratelimit_burst, | |
631 | .maxlen = sizeof(int), | |
632 | .mode = 0644, | |
633 | .proc_handler = &proc_dointvec, | |
634 | }, | |
635 | { | |
636 | .ctl_name = KERN_NGROUPS_MAX, | |
637 | .procname = "ngroups_max", | |
638 | .data = &ngroups_max, | |
639 | .maxlen = sizeof (int), | |
640 | .mode = 0444, | |
641 | .proc_handler = &proc_dointvec, | |
642 | }, | |
643 | #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86) | |
644 | { | |
645 | .ctl_name = KERN_UNKNOWN_NMI_PANIC, | |
646 | .procname = "unknown_nmi_panic", | |
647 | .data = &unknown_nmi_panic, | |
648 | .maxlen = sizeof (int), | |
649 | .mode = 0644, | |
2fbe7b25 | 650 | .proc_handler = &proc_dointvec, |
1da177e4 | 651 | }, |
407984f1 DZ |
652 | { |
653 | .ctl_name = KERN_NMI_WATCHDOG, | |
654 | .procname = "nmi_watchdog", | |
655 | .data = &nmi_watchdog_enabled, | |
656 | .maxlen = sizeof (int), | |
657 | .mode = 0644, | |
658 | .proc_handler = &proc_nmi_enabled, | |
1da177e4 LT |
659 | }, |
660 | #endif | |
661 | #if defined(CONFIG_X86) | |
8da5adda DZ |
662 | { |
663 | .ctl_name = KERN_PANIC_ON_NMI, | |
664 | .procname = "panic_on_unrecovered_nmi", | |
665 | .data = &panic_on_unrecovered_nmi, | |
666 | .maxlen = sizeof(int), | |
667 | .mode = 0644, | |
668 | .proc_handler = &proc_dointvec, | |
669 | }, | |
1da177e4 LT |
670 | { |
671 | .ctl_name = KERN_BOOTLOADER_TYPE, | |
672 | .procname = "bootloader_type", | |
673 | .data = &bootloader_type, | |
674 | .maxlen = sizeof (int), | |
675 | .mode = 0444, | |
676 | .proc_handler = &proc_dointvec, | |
677 | }, | |
0741f4d2 CE |
678 | { |
679 | .ctl_name = CTL_UNNUMBERED, | |
680 | .procname = "kstack_depth_to_print", | |
681 | .data = &kstack_depth_to_print, | |
682 | .maxlen = sizeof(int), | |
683 | .mode = 0644, | |
684 | .proc_handler = &proc_dointvec, | |
685 | }, | |
1da177e4 | 686 | #endif |
7a9166e3 | 687 | #if defined(CONFIG_MMU) |
1da177e4 LT |
688 | { |
689 | .ctl_name = KERN_RANDOMIZE, | |
690 | .procname = "randomize_va_space", | |
691 | .data = &randomize_va_space, | |
692 | .maxlen = sizeof(int), | |
693 | .mode = 0644, | |
694 | .proc_handler = &proc_dointvec, | |
695 | }, | |
7a9166e3 | 696 | #endif |
0152fb37 | 697 | #if defined(CONFIG_S390) && defined(CONFIG_SMP) |
951f22d5 MS |
698 | { |
699 | .ctl_name = KERN_SPIN_RETRY, | |
700 | .procname = "spin_retry", | |
701 | .data = &spin_retry, | |
702 | .maxlen = sizeof (int), | |
703 | .mode = 0644, | |
704 | .proc_handler = &proc_dointvec, | |
705 | }, | |
c255d844 | 706 | #endif |
673d5b43 | 707 | #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86) |
c255d844 PM |
708 | { |
709 | .ctl_name = KERN_ACPI_VIDEO_FLAGS, | |
710 | .procname = "acpi_video_flags", | |
77afcf78 | 711 | .data = &acpi_realmode_flags, |
c255d844 PM |
712 | .maxlen = sizeof (unsigned long), |
713 | .mode = 0644, | |
7f99f06f | 714 | .proc_handler = &proc_doulongvec_minmax, |
c255d844 | 715 | }, |
d2b176ed JS |
716 | #endif |
717 | #ifdef CONFIG_IA64 | |
718 | { | |
719 | .ctl_name = KERN_IA64_UNALIGNED, | |
720 | .procname = "ignore-unaligned-usertrap", | |
721 | .data = &no_unaligned_warning, | |
722 | .maxlen = sizeof (int), | |
723 | .mode = 0644, | |
724 | .proc_handler = &proc_dointvec, | |
725 | }, | |
bebfa101 | 726 | #endif |
c4f3b63f RT |
727 | #ifdef CONFIG_DETECT_SOFTLOCKUP |
728 | { | |
729 | .ctl_name = CTL_UNNUMBERED, | |
730 | .procname = "softlockup_thresh", | |
731 | .data = &softlockup_thresh, | |
732 | .maxlen = sizeof(int), | |
733 | .mode = 0644, | |
734 | .proc_handler = &proc_dointvec_minmax, | |
735 | .strategy = &sysctl_intvec, | |
736 | .extra1 = &one, | |
737 | .extra2 = &sixty, | |
738 | }, | |
739 | #endif | |
bebfa101 AK |
740 | #ifdef CONFIG_COMPAT |
741 | { | |
742 | .ctl_name = KERN_COMPAT_LOG, | |
743 | .procname = "compat-log", | |
744 | .data = &compat_log, | |
745 | .maxlen = sizeof (int), | |
746 | .mode = 0644, | |
747 | .proc_handler = &proc_dointvec, | |
748 | }, | |
951f22d5 | 749 | #endif |
23f78d4a IM |
750 | #ifdef CONFIG_RT_MUTEXES |
751 | { | |
752 | .ctl_name = KERN_MAX_LOCK_DEPTH, | |
753 | .procname = "max_lock_depth", | |
754 | .data = &max_lock_depth, | |
755 | .maxlen = sizeof(int), | |
756 | .mode = 0644, | |
757 | .proc_handler = &proc_dointvec, | |
758 | }, | |
759 | #endif | |
5096add8 KC |
760 | #ifdef CONFIG_PROC_FS |
761 | { | |
762 | .ctl_name = CTL_UNNUMBERED, | |
763 | .procname = "maps_protect", | |
764 | .data = &maps_protect, | |
765 | .maxlen = sizeof(int), | |
766 | .mode = 0644, | |
767 | .proc_handler = &proc_dointvec, | |
768 | }, | |
769 | #endif | |
10a0a8d4 JF |
770 | { |
771 | .ctl_name = CTL_UNNUMBERED, | |
772 | .procname = "poweroff_cmd", | |
773 | .data = &poweroff_cmd, | |
774 | .maxlen = POWEROFF_CMD_PATH_LEN, | |
775 | .mode = 0644, | |
776 | .proc_handler = &proc_dostring, | |
777 | .strategy = &sysctl_string, | |
778 | }, | |
ed2c12f3 AM |
779 | /* |
780 | * NOTE: do not add new entries to this table unless you have read | |
781 | * Documentation/sysctl/ctl_unnumbered.txt | |
782 | */ | |
1da177e4 LT |
783 | { .ctl_name = 0 } |
784 | }; | |
785 | ||
1da177e4 LT |
786 | static ctl_table vm_table[] = { |
787 | { | |
788 | .ctl_name = VM_OVERCOMMIT_MEMORY, | |
789 | .procname = "overcommit_memory", | |
790 | .data = &sysctl_overcommit_memory, | |
791 | .maxlen = sizeof(sysctl_overcommit_memory), | |
792 | .mode = 0644, | |
793 | .proc_handler = &proc_dointvec, | |
794 | }, | |
fadd8fbd KH |
795 | { |
796 | .ctl_name = VM_PANIC_ON_OOM, | |
797 | .procname = "panic_on_oom", | |
798 | .data = &sysctl_panic_on_oom, | |
799 | .maxlen = sizeof(sysctl_panic_on_oom), | |
800 | .mode = 0644, | |
801 | .proc_handler = &proc_dointvec, | |
802 | }, | |
fe071d7e DR |
803 | { |
804 | .ctl_name = CTL_UNNUMBERED, | |
805 | .procname = "oom_kill_allocating_task", | |
806 | .data = &sysctl_oom_kill_allocating_task, | |
807 | .maxlen = sizeof(sysctl_oom_kill_allocating_task), | |
808 | .mode = 0644, | |
809 | .proc_handler = &proc_dointvec, | |
810 | }, | |
1da177e4 LT |
811 | { |
812 | .ctl_name = VM_OVERCOMMIT_RATIO, | |
813 | .procname = "overcommit_ratio", | |
814 | .data = &sysctl_overcommit_ratio, | |
815 | .maxlen = sizeof(sysctl_overcommit_ratio), | |
816 | .mode = 0644, | |
817 | .proc_handler = &proc_dointvec, | |
818 | }, | |
819 | { | |
820 | .ctl_name = VM_PAGE_CLUSTER, | |
821 | .procname = "page-cluster", | |
822 | .data = &page_cluster, | |
823 | .maxlen = sizeof(int), | |
824 | .mode = 0644, | |
825 | .proc_handler = &proc_dointvec, | |
826 | }, | |
827 | { | |
828 | .ctl_name = VM_DIRTY_BACKGROUND, | |
829 | .procname = "dirty_background_ratio", | |
830 | .data = &dirty_background_ratio, | |
831 | .maxlen = sizeof(dirty_background_ratio), | |
832 | .mode = 0644, | |
833 | .proc_handler = &proc_dointvec_minmax, | |
834 | .strategy = &sysctl_intvec, | |
835 | .extra1 = &zero, | |
836 | .extra2 = &one_hundred, | |
837 | }, | |
838 | { | |
839 | .ctl_name = VM_DIRTY_RATIO, | |
840 | .procname = "dirty_ratio", | |
841 | .data = &vm_dirty_ratio, | |
842 | .maxlen = sizeof(vm_dirty_ratio), | |
843 | .mode = 0644, | |
04fbfdc1 | 844 | .proc_handler = &dirty_ratio_handler, |
1da177e4 LT |
845 | .strategy = &sysctl_intvec, |
846 | .extra1 = &zero, | |
847 | .extra2 = &one_hundred, | |
848 | }, | |
849 | { | |
850 | .ctl_name = VM_DIRTY_WB_CS, | |
851 | .procname = "dirty_writeback_centisecs", | |
f6ef9438 BS |
852 | .data = &dirty_writeback_interval, |
853 | .maxlen = sizeof(dirty_writeback_interval), | |
1da177e4 LT |
854 | .mode = 0644, |
855 | .proc_handler = &dirty_writeback_centisecs_handler, | |
856 | }, | |
857 | { | |
858 | .ctl_name = VM_DIRTY_EXPIRE_CS, | |
859 | .procname = "dirty_expire_centisecs", | |
f6ef9438 BS |
860 | .data = &dirty_expire_interval, |
861 | .maxlen = sizeof(dirty_expire_interval), | |
1da177e4 | 862 | .mode = 0644, |
f6ef9438 | 863 | .proc_handler = &proc_dointvec_userhz_jiffies, |
1da177e4 LT |
864 | }, |
865 | { | |
866 | .ctl_name = VM_NR_PDFLUSH_THREADS, | |
867 | .procname = "nr_pdflush_threads", | |
868 | .data = &nr_pdflush_threads, | |
869 | .maxlen = sizeof nr_pdflush_threads, | |
870 | .mode = 0444 /* read-only*/, | |
871 | .proc_handler = &proc_dointvec, | |
872 | }, | |
873 | { | |
874 | .ctl_name = VM_SWAPPINESS, | |
875 | .procname = "swappiness", | |
876 | .data = &vm_swappiness, | |
877 | .maxlen = sizeof(vm_swappiness), | |
878 | .mode = 0644, | |
879 | .proc_handler = &proc_dointvec_minmax, | |
880 | .strategy = &sysctl_intvec, | |
881 | .extra1 = &zero, | |
882 | .extra2 = &one_hundred, | |
883 | }, | |
884 | #ifdef CONFIG_HUGETLB_PAGE | |
885 | { | |
886 | .ctl_name = VM_HUGETLB_PAGES, | |
887 | .procname = "nr_hugepages", | |
888 | .data = &max_huge_pages, | |
889 | .maxlen = sizeof(unsigned long), | |
890 | .mode = 0644, | |
891 | .proc_handler = &hugetlb_sysctl_handler, | |
892 | .extra1 = (void *)&hugetlb_zero, | |
893 | .extra2 = (void *)&hugetlb_infinity, | |
894 | }, | |
895 | { | |
896 | .ctl_name = VM_HUGETLB_GROUP, | |
897 | .procname = "hugetlb_shm_group", | |
898 | .data = &sysctl_hugetlb_shm_group, | |
899 | .maxlen = sizeof(gid_t), | |
900 | .mode = 0644, | |
901 | .proc_handler = &proc_dointvec, | |
902 | }, | |
396faf03 MG |
903 | { |
904 | .ctl_name = CTL_UNNUMBERED, | |
905 | .procname = "hugepages_treat_as_movable", | |
906 | .data = &hugepages_treat_as_movable, | |
907 | .maxlen = sizeof(int), | |
908 | .mode = 0644, | |
909 | .proc_handler = &hugetlb_treat_movable_handler, | |
910 | }, | |
54f9f80d AL |
911 | { |
912 | .ctl_name = CTL_UNNUMBERED, | |
913 | .procname = "hugetlb_dynamic_pool", | |
914 | .data = &hugetlb_dynamic_pool, | |
915 | .maxlen = sizeof(hugetlb_dynamic_pool), | |
916 | .mode = 0644, | |
917 | .proc_handler = &proc_dointvec, | |
918 | }, | |
1da177e4 LT |
919 | #endif |
920 | { | |
921 | .ctl_name = VM_LOWMEM_RESERVE_RATIO, | |
922 | .procname = "lowmem_reserve_ratio", | |
923 | .data = &sysctl_lowmem_reserve_ratio, | |
924 | .maxlen = sizeof(sysctl_lowmem_reserve_ratio), | |
925 | .mode = 0644, | |
926 | .proc_handler = &lowmem_reserve_ratio_sysctl_handler, | |
927 | .strategy = &sysctl_intvec, | |
928 | }, | |
9d0243bc AM |
929 | { |
930 | .ctl_name = VM_DROP_PAGECACHE, | |
931 | .procname = "drop_caches", | |
932 | .data = &sysctl_drop_caches, | |
933 | .maxlen = sizeof(int), | |
934 | .mode = 0644, | |
935 | .proc_handler = drop_caches_sysctl_handler, | |
936 | .strategy = &sysctl_intvec, | |
937 | }, | |
1da177e4 LT |
938 | { |
939 | .ctl_name = VM_MIN_FREE_KBYTES, | |
940 | .procname = "min_free_kbytes", | |
941 | .data = &min_free_kbytes, | |
942 | .maxlen = sizeof(min_free_kbytes), | |
943 | .mode = 0644, | |
944 | .proc_handler = &min_free_kbytes_sysctl_handler, | |
945 | .strategy = &sysctl_intvec, | |
946 | .extra1 = &zero, | |
947 | }, | |
8ad4b1fb RS |
948 | { |
949 | .ctl_name = VM_PERCPU_PAGELIST_FRACTION, | |
950 | .procname = "percpu_pagelist_fraction", | |
951 | .data = &percpu_pagelist_fraction, | |
952 | .maxlen = sizeof(percpu_pagelist_fraction), | |
953 | .mode = 0644, | |
954 | .proc_handler = &percpu_pagelist_fraction_sysctl_handler, | |
955 | .strategy = &sysctl_intvec, | |
956 | .extra1 = &min_percpu_pagelist_fract, | |
957 | }, | |
1da177e4 LT |
958 | #ifdef CONFIG_MMU |
959 | { | |
960 | .ctl_name = VM_MAX_MAP_COUNT, | |
961 | .procname = "max_map_count", | |
962 | .data = &sysctl_max_map_count, | |
963 | .maxlen = sizeof(sysctl_max_map_count), | |
964 | .mode = 0644, | |
965 | .proc_handler = &proc_dointvec | |
966 | }, | |
967 | #endif | |
968 | { | |
969 | .ctl_name = VM_LAPTOP_MODE, | |
970 | .procname = "laptop_mode", | |
971 | .data = &laptop_mode, | |
972 | .maxlen = sizeof(laptop_mode), | |
973 | .mode = 0644, | |
ed5b43f1 BS |
974 | .proc_handler = &proc_dointvec_jiffies, |
975 | .strategy = &sysctl_jiffies, | |
1da177e4 LT |
976 | }, |
977 | { | |
978 | .ctl_name = VM_BLOCK_DUMP, | |
979 | .procname = "block_dump", | |
980 | .data = &block_dump, | |
981 | .maxlen = sizeof(block_dump), | |
982 | .mode = 0644, | |
983 | .proc_handler = &proc_dointvec, | |
984 | .strategy = &sysctl_intvec, | |
985 | .extra1 = &zero, | |
986 | }, | |
987 | { | |
988 | .ctl_name = VM_VFS_CACHE_PRESSURE, | |
989 | .procname = "vfs_cache_pressure", | |
990 | .data = &sysctl_vfs_cache_pressure, | |
991 | .maxlen = sizeof(sysctl_vfs_cache_pressure), | |
992 | .mode = 0644, | |
993 | .proc_handler = &proc_dointvec, | |
994 | .strategy = &sysctl_intvec, | |
995 | .extra1 = &zero, | |
996 | }, | |
997 | #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT | |
998 | { | |
999 | .ctl_name = VM_LEGACY_VA_LAYOUT, | |
1000 | .procname = "legacy_va_layout", | |
1001 | .data = &sysctl_legacy_va_layout, | |
1002 | .maxlen = sizeof(sysctl_legacy_va_layout), | |
1003 | .mode = 0644, | |
1004 | .proc_handler = &proc_dointvec, | |
1005 | .strategy = &sysctl_intvec, | |
1006 | .extra1 = &zero, | |
1007 | }, | |
1008 | #endif | |
1743660b CL |
1009 | #ifdef CONFIG_NUMA |
1010 | { | |
1011 | .ctl_name = VM_ZONE_RECLAIM_MODE, | |
1012 | .procname = "zone_reclaim_mode", | |
1013 | .data = &zone_reclaim_mode, | |
1014 | .maxlen = sizeof(zone_reclaim_mode), | |
1015 | .mode = 0644, | |
1016 | .proc_handler = &proc_dointvec, | |
c84db23c CL |
1017 | .strategy = &sysctl_intvec, |
1018 | .extra1 = &zero, | |
1743660b | 1019 | }, |
9614634f CL |
1020 | { |
1021 | .ctl_name = VM_MIN_UNMAPPED, | |
1022 | .procname = "min_unmapped_ratio", | |
1023 | .data = &sysctl_min_unmapped_ratio, | |
1024 | .maxlen = sizeof(sysctl_min_unmapped_ratio), | |
1025 | .mode = 0644, | |
1026 | .proc_handler = &sysctl_min_unmapped_ratio_sysctl_handler, | |
1027 | .strategy = &sysctl_intvec, | |
1028 | .extra1 = &zero, | |
1029 | .extra2 = &one_hundred, | |
1030 | }, | |
0ff38490 CL |
1031 | { |
1032 | .ctl_name = VM_MIN_SLAB, | |
1033 | .procname = "min_slab_ratio", | |
1034 | .data = &sysctl_min_slab_ratio, | |
1035 | .maxlen = sizeof(sysctl_min_slab_ratio), | |
1036 | .mode = 0644, | |
1037 | .proc_handler = &sysctl_min_slab_ratio_sysctl_handler, | |
1038 | .strategy = &sysctl_intvec, | |
1039 | .extra1 = &zero, | |
1040 | .extra2 = &one_hundred, | |
1041 | }, | |
e6e5494c | 1042 | #endif |
77461ab3 CL |
1043 | #ifdef CONFIG_SMP |
1044 | { | |
1045 | .ctl_name = CTL_UNNUMBERED, | |
1046 | .procname = "stat_interval", | |
1047 | .data = &sysctl_stat_interval, | |
1048 | .maxlen = sizeof(sysctl_stat_interval), | |
1049 | .mode = 0644, | |
1050 | .proc_handler = &proc_dointvec_jiffies, | |
1051 | .strategy = &sysctl_jiffies, | |
1052 | }, | |
1053 | #endif | |
ed032189 EP |
1054 | #ifdef CONFIG_SECURITY |
1055 | { | |
1056 | .ctl_name = CTL_UNNUMBERED, | |
1057 | .procname = "mmap_min_addr", | |
1058 | .data = &mmap_min_addr, | |
1059 | .maxlen = sizeof(unsigned long), | |
1060 | .mode = 0644, | |
1061 | .proc_handler = &proc_doulongvec_minmax, | |
1062 | }, | |
8daec965 | 1063 | #endif |
f0c0b2b8 KH |
1064 | #ifdef CONFIG_NUMA |
1065 | { | |
1066 | .ctl_name = CTL_UNNUMBERED, | |
1067 | .procname = "numa_zonelist_order", | |
1068 | .data = &numa_zonelist_order, | |
1069 | .maxlen = NUMA_ZONELIST_ORDER_LEN, | |
1070 | .mode = 0644, | |
1071 | .proc_handler = &numa_zonelist_order_handler, | |
1072 | .strategy = &sysctl_string, | |
1073 | }, | |
1074 | #endif | |
2b8232ce | 1075 | #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \ |
5c36e657 | 1076 | (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL)) |
e6e5494c IM |
1077 | { |
1078 | .ctl_name = VM_VDSO_ENABLED, | |
1079 | .procname = "vdso_enabled", | |
1080 | .data = &vdso_enabled, | |
1081 | .maxlen = sizeof(vdso_enabled), | |
1082 | .mode = 0644, | |
1083 | .proc_handler = &proc_dointvec, | |
1084 | .strategy = &sysctl_intvec, | |
1085 | .extra1 = &zero, | |
1086 | }, | |
1da177e4 | 1087 | #endif |
2be7fe07 AM |
1088 | /* |
1089 | * NOTE: do not add new entries to this table unless you have read | |
1090 | * Documentation/sysctl/ctl_unnumbered.txt | |
1091 | */ | |
1da177e4 LT |
1092 | { .ctl_name = 0 } |
1093 | }; | |
1094 | ||
2abc26fc EB |
1095 | #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) |
1096 | static ctl_table binfmt_misc_table[] = { | |
1097 | { .ctl_name = 0 } | |
1098 | }; | |
1099 | #endif | |
1100 | ||
1da177e4 LT |
1101 | static ctl_table fs_table[] = { |
1102 | { | |
1103 | .ctl_name = FS_NRINODE, | |
1104 | .procname = "inode-nr", | |
1105 | .data = &inodes_stat, | |
1106 | .maxlen = 2*sizeof(int), | |
1107 | .mode = 0444, | |
1108 | .proc_handler = &proc_dointvec, | |
1109 | }, | |
1110 | { | |
1111 | .ctl_name = FS_STATINODE, | |
1112 | .procname = "inode-state", | |
1113 | .data = &inodes_stat, | |
1114 | .maxlen = 7*sizeof(int), | |
1115 | .mode = 0444, | |
1116 | .proc_handler = &proc_dointvec, | |
1117 | }, | |
1118 | { | |
1119 | .ctl_name = FS_NRFILE, | |
1120 | .procname = "file-nr", | |
1121 | .data = &files_stat, | |
1122 | .maxlen = 3*sizeof(int), | |
1123 | .mode = 0444, | |
529bf6be | 1124 | .proc_handler = &proc_nr_files, |
1da177e4 LT |
1125 | }, |
1126 | { | |
1127 | .ctl_name = FS_MAXFILE, | |
1128 | .procname = "file-max", | |
1129 | .data = &files_stat.max_files, | |
1130 | .maxlen = sizeof(int), | |
1131 | .mode = 0644, | |
1132 | .proc_handler = &proc_dointvec, | |
1133 | }, | |
1134 | { | |
1135 | .ctl_name = FS_DENTRY, | |
1136 | .procname = "dentry-state", | |
1137 | .data = &dentry_stat, | |
1138 | .maxlen = 6*sizeof(int), | |
1139 | .mode = 0444, | |
1140 | .proc_handler = &proc_dointvec, | |
1141 | }, | |
1142 | { | |
1143 | .ctl_name = FS_OVERFLOWUID, | |
1144 | .procname = "overflowuid", | |
1145 | .data = &fs_overflowuid, | |
1146 | .maxlen = sizeof(int), | |
1147 | .mode = 0644, | |
1148 | .proc_handler = &proc_dointvec_minmax, | |
1149 | .strategy = &sysctl_intvec, | |
1150 | .extra1 = &minolduid, | |
1151 | .extra2 = &maxolduid, | |
1152 | }, | |
1153 | { | |
1154 | .ctl_name = FS_OVERFLOWGID, | |
1155 | .procname = "overflowgid", | |
1156 | .data = &fs_overflowgid, | |
1157 | .maxlen = sizeof(int), | |
1158 | .mode = 0644, | |
1159 | .proc_handler = &proc_dointvec_minmax, | |
1160 | .strategy = &sysctl_intvec, | |
1161 | .extra1 = &minolduid, | |
1162 | .extra2 = &maxolduid, | |
1163 | }, | |
1164 | { | |
1165 | .ctl_name = FS_LEASES, | |
1166 | .procname = "leases-enable", | |
1167 | .data = &leases_enable, | |
1168 | .maxlen = sizeof(int), | |
1169 | .mode = 0644, | |
1170 | .proc_handler = &proc_dointvec, | |
1171 | }, | |
1172 | #ifdef CONFIG_DNOTIFY | |
1173 | { | |
1174 | .ctl_name = FS_DIR_NOTIFY, | |
1175 | .procname = "dir-notify-enable", | |
1176 | .data = &dir_notify_enable, | |
1177 | .maxlen = sizeof(int), | |
1178 | .mode = 0644, | |
1179 | .proc_handler = &proc_dointvec, | |
1180 | }, | |
1181 | #endif | |
1182 | #ifdef CONFIG_MMU | |
1183 | { | |
1184 | .ctl_name = FS_LEASE_TIME, | |
1185 | .procname = "lease-break-time", | |
1186 | .data = &lease_break_time, | |
1187 | .maxlen = sizeof(int), | |
1188 | .mode = 0644, | |
76fdbb25 KH |
1189 | .proc_handler = &proc_dointvec_minmax, |
1190 | .strategy = &sysctl_intvec, | |
1191 | .extra1 = &zero, | |
1192 | .extra2 = &two, | |
1da177e4 LT |
1193 | }, |
1194 | { | |
1195 | .ctl_name = FS_AIO_NR, | |
1196 | .procname = "aio-nr", | |
1197 | .data = &aio_nr, | |
1198 | .maxlen = sizeof(aio_nr), | |
1199 | .mode = 0444, | |
d55b5fda | 1200 | .proc_handler = &proc_doulongvec_minmax, |
1da177e4 LT |
1201 | }, |
1202 | { | |
1203 | .ctl_name = FS_AIO_MAX_NR, | |
1204 | .procname = "aio-max-nr", | |
1205 | .data = &aio_max_nr, | |
1206 | .maxlen = sizeof(aio_max_nr), | |
1207 | .mode = 0644, | |
d55b5fda | 1208 | .proc_handler = &proc_doulongvec_minmax, |
1da177e4 | 1209 | }, |
2d9048e2 | 1210 | #ifdef CONFIG_INOTIFY_USER |
0399cb08 RL |
1211 | { |
1212 | .ctl_name = FS_INOTIFY, | |
1213 | .procname = "inotify", | |
1214 | .mode = 0555, | |
1215 | .child = inotify_table, | |
1216 | }, | |
1217 | #endif | |
1da177e4 | 1218 | #endif |
d6e71144 AC |
1219 | { |
1220 | .ctl_name = KERN_SETUID_DUMPABLE, | |
1221 | .procname = "suid_dumpable", | |
1222 | .data = &suid_dumpable, | |
1223 | .maxlen = sizeof(int), | |
1224 | .mode = 0644, | |
1225 | .proc_handler = &proc_dointvec, | |
1226 | }, | |
2abc26fc EB |
1227 | #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) |
1228 | { | |
1229 | .ctl_name = CTL_UNNUMBERED, | |
1230 | .procname = "binfmt_misc", | |
1231 | .mode = 0555, | |
1232 | .child = binfmt_misc_table, | |
1233 | }, | |
1234 | #endif | |
2be7fe07 AM |
1235 | /* |
1236 | * NOTE: do not add new entries to this table unless you have read | |
1237 | * Documentation/sysctl/ctl_unnumbered.txt | |
2be7fe07 | 1238 | */ |
1da177e4 LT |
1239 | { .ctl_name = 0 } |
1240 | }; | |
1241 | ||
1242 | static ctl_table debug_table[] = { | |
d0c3d534 | 1243 | #if defined(CONFIG_X86) || defined(CONFIG_PPC) |
abd4f750 MAS |
1244 | { |
1245 | .ctl_name = CTL_UNNUMBERED, | |
1246 | .procname = "exception-trace", | |
1247 | .data = &show_unhandled_signals, | |
1248 | .maxlen = sizeof(int), | |
1249 | .mode = 0644, | |
1250 | .proc_handler = proc_dointvec | |
1251 | }, | |
1252 | #endif | |
1da177e4 LT |
1253 | { .ctl_name = 0 } |
1254 | }; | |
1255 | ||
1256 | static ctl_table dev_table[] = { | |
1257 | { .ctl_name = 0 } | |
0eeca283 | 1258 | }; |
1da177e4 | 1259 | |
330d57fb AV |
1260 | static DEFINE_SPINLOCK(sysctl_lock); |
1261 | ||
1262 | /* called under sysctl_lock */ | |
1263 | static int use_table(struct ctl_table_header *p) | |
1264 | { | |
1265 | if (unlikely(p->unregistering)) | |
1266 | return 0; | |
1267 | p->used++; | |
1268 | return 1; | |
1269 | } | |
1270 | ||
1271 | /* called under sysctl_lock */ | |
1272 | static void unuse_table(struct ctl_table_header *p) | |
1273 | { | |
1274 | if (!--p->used) | |
1275 | if (unlikely(p->unregistering)) | |
1276 | complete(p->unregistering); | |
1277 | } | |
1278 | ||
1279 | /* called under sysctl_lock, will reacquire if has to wait */ | |
1280 | static void start_unregistering(struct ctl_table_header *p) | |
1281 | { | |
1282 | /* | |
1283 | * if p->used is 0, nobody will ever touch that entry again; | |
1284 | * we'll eliminate all paths to it before dropping sysctl_lock | |
1285 | */ | |
1286 | if (unlikely(p->used)) { | |
1287 | struct completion wait; | |
1288 | init_completion(&wait); | |
1289 | p->unregistering = &wait; | |
1290 | spin_unlock(&sysctl_lock); | |
1291 | wait_for_completion(&wait); | |
1292 | spin_lock(&sysctl_lock); | |
1293 | } | |
1294 | /* | |
1295 | * do not remove from the list until nobody holds it; walking the | |
1296 | * list in do_sysctl() relies on that. | |
1297 | */ | |
1298 | list_del_init(&p->ctl_entry); | |
1299 | } | |
1300 | ||
805b5d5e EB |
1301 | void sysctl_head_finish(struct ctl_table_header *head) |
1302 | { | |
1303 | if (!head) | |
1304 | return; | |
1305 | spin_lock(&sysctl_lock); | |
1306 | unuse_table(head); | |
1307 | spin_unlock(&sysctl_lock); | |
1308 | } | |
1309 | ||
1310 | struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev) | |
1311 | { | |
1312 | struct ctl_table_header *head; | |
1313 | struct list_head *tmp; | |
1314 | spin_lock(&sysctl_lock); | |
1315 | if (prev) { | |
1316 | tmp = &prev->ctl_entry; | |
1317 | unuse_table(prev); | |
1318 | goto next; | |
1319 | } | |
1320 | tmp = &root_table_header.ctl_entry; | |
1321 | for (;;) { | |
1322 | head = list_entry(tmp, struct ctl_table_header, ctl_entry); | |
1323 | ||
1324 | if (!use_table(head)) | |
1325 | goto next; | |
1326 | spin_unlock(&sysctl_lock); | |
1327 | return head; | |
1328 | next: | |
1329 | tmp = tmp->next; | |
1330 | if (tmp == &root_table_header.ctl_entry) | |
1331 | break; | |
1332 | } | |
1333 | spin_unlock(&sysctl_lock); | |
1334 | return NULL; | |
1335 | } | |
1336 | ||
b89a8171 | 1337 | #ifdef CONFIG_SYSCTL_SYSCALL |
1da177e4 LT |
1338 | int do_sysctl(int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp, |
1339 | void __user *newval, size_t newlen) | |
1340 | { | |
805b5d5e | 1341 | struct ctl_table_header *head; |
330d57fb | 1342 | int error = -ENOTDIR; |
1da177e4 LT |
1343 | |
1344 | if (nlen <= 0 || nlen >= CTL_MAXNAME) | |
1345 | return -ENOTDIR; | |
1346 | if (oldval) { | |
1347 | int old_len; | |
1348 | if (!oldlenp || get_user(old_len, oldlenp)) | |
1349 | return -EFAULT; | |
1350 | } | |
330d57fb | 1351 | |
805b5d5e EB |
1352 | for (head = sysctl_head_next(NULL); head; |
1353 | head = sysctl_head_next(head)) { | |
330d57fb | 1354 | error = parse_table(name, nlen, oldval, oldlenp, |
1f29bcd7 | 1355 | newval, newlen, head->ctl_table); |
805b5d5e EB |
1356 | if (error != -ENOTDIR) { |
1357 | sysctl_head_finish(head); | |
330d57fb | 1358 | break; |
805b5d5e EB |
1359 | } |
1360 | } | |
330d57fb | 1361 | return error; |
1da177e4 LT |
1362 | } |
1363 | ||
1364 | asmlinkage long sys_sysctl(struct __sysctl_args __user *args) | |
1365 | { | |
1366 | struct __sysctl_args tmp; | |
1367 | int error; | |
1368 | ||
1369 | if (copy_from_user(&tmp, args, sizeof(tmp))) | |
1370 | return -EFAULT; | |
1371 | ||
1372 | lock_kernel(); | |
1373 | error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp, | |
1374 | tmp.newval, tmp.newlen); | |
1375 | unlock_kernel(); | |
1376 | return error; | |
1377 | } | |
b89a8171 | 1378 | #endif /* CONFIG_SYSCTL_SYSCALL */ |
1da177e4 LT |
1379 | |
1380 | /* | |
1ff007eb | 1381 | * sysctl_perm does NOT grant the superuser all rights automatically, because |
1da177e4 LT |
1382 | * some sysctl variables are readonly even to root. |
1383 | */ | |
1384 | ||
1385 | static int test_perm(int mode, int op) | |
1386 | { | |
1387 | if (!current->euid) | |
1388 | mode >>= 6; | |
1389 | else if (in_egroup_p(0)) | |
1390 | mode >>= 3; | |
1391 | if ((mode & op & 0007) == op) | |
1392 | return 0; | |
1393 | return -EACCES; | |
1394 | } | |
1395 | ||
1ff007eb | 1396 | int sysctl_perm(ctl_table *table, int op) |
1da177e4 LT |
1397 | { |
1398 | int error; | |
1399 | error = security_sysctl(table, op); | |
1400 | if (error) | |
1401 | return error; | |
1402 | return test_perm(table->mode, op); | |
1403 | } | |
1404 | ||
b89a8171 | 1405 | #ifdef CONFIG_SYSCTL_SYSCALL |
1da177e4 LT |
1406 | static int parse_table(int __user *name, int nlen, |
1407 | void __user *oldval, size_t __user *oldlenp, | |
1408 | void __user *newval, size_t newlen, | |
1f29bcd7 | 1409 | ctl_table *table) |
1da177e4 LT |
1410 | { |
1411 | int n; | |
1412 | repeat: | |
1413 | if (!nlen) | |
1414 | return -ENOTDIR; | |
1415 | if (get_user(n, name)) | |
1416 | return -EFAULT; | |
d99f160a EB |
1417 | for ( ; table->ctl_name || table->procname; table++) { |
1418 | if (!table->ctl_name) | |
1419 | continue; | |
6703ddfc | 1420 | if (n == table->ctl_name) { |
1da177e4 LT |
1421 | int error; |
1422 | if (table->child) { | |
1ff007eb | 1423 | if (sysctl_perm(table, 001)) |
1da177e4 | 1424 | return -EPERM; |
1da177e4 LT |
1425 | name++; |
1426 | nlen--; | |
1427 | table = table->child; | |
1428 | goto repeat; | |
1429 | } | |
1430 | error = do_sysctl_strategy(table, name, nlen, | |
1431 | oldval, oldlenp, | |
1f29bcd7 | 1432 | newval, newlen); |
1da177e4 LT |
1433 | return error; |
1434 | } | |
1435 | } | |
1436 | return -ENOTDIR; | |
1437 | } | |
1438 | ||
1439 | /* Perform the actual read/write of a sysctl table entry. */ | |
1440 | int do_sysctl_strategy (ctl_table *table, | |
1441 | int __user *name, int nlen, | |
1442 | void __user *oldval, size_t __user *oldlenp, | |
1f29bcd7 | 1443 | void __user *newval, size_t newlen) |
1da177e4 LT |
1444 | { |
1445 | int op = 0, rc; | |
1446 | size_t len; | |
1447 | ||
1448 | if (oldval) | |
1449 | op |= 004; | |
1450 | if (newval) | |
1451 | op |= 002; | |
1ff007eb | 1452 | if (sysctl_perm(table, op)) |
1da177e4 LT |
1453 | return -EPERM; |
1454 | ||
1455 | if (table->strategy) { | |
1456 | rc = table->strategy(table, name, nlen, oldval, oldlenp, | |
1f29bcd7 | 1457 | newval, newlen); |
1da177e4 LT |
1458 | if (rc < 0) |
1459 | return rc; | |
1460 | if (rc > 0) | |
1461 | return 0; | |
1462 | } | |
1463 | ||
1464 | /* If there is no strategy routine, or if the strategy returns | |
1465 | * zero, proceed with automatic r/w */ | |
1466 | if (table->data && table->maxlen) { | |
1467 | if (oldval && oldlenp) { | |
1468 | if (get_user(len, oldlenp)) | |
1469 | return -EFAULT; | |
1470 | if (len) { | |
1471 | if (len > table->maxlen) | |
1472 | len = table->maxlen; | |
1473 | if(copy_to_user(oldval, table->data, len)) | |
1474 | return -EFAULT; | |
1475 | if(put_user(len, oldlenp)) | |
1476 | return -EFAULT; | |
1477 | } | |
1478 | } | |
1479 | if (newval && newlen) { | |
1480 | len = newlen; | |
1481 | if (len > table->maxlen) | |
1482 | len = table->maxlen; | |
1483 | if(copy_from_user(table->data, newval, len)) | |
1484 | return -EFAULT; | |
1485 | } | |
1486 | } | |
1487 | return 0; | |
1488 | } | |
b89a8171 | 1489 | #endif /* CONFIG_SYSCTL_SYSCALL */ |
1da177e4 | 1490 | |
d912b0cc EB |
1491 | static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table) |
1492 | { | |
1493 | for (; table->ctl_name || table->procname; table++) { | |
1494 | table->parent = parent; | |
1495 | if (table->child) | |
1496 | sysctl_set_parent(table, table->child); | |
1497 | } | |
1498 | } | |
1499 | ||
1500 | static __init int sysctl_init(void) | |
1501 | { | |
1502 | sysctl_set_parent(NULL, root_table); | |
1503 | return 0; | |
1504 | } | |
1505 | ||
1506 | core_initcall(sysctl_init); | |
1507 | ||
1da177e4 LT |
1508 | /** |
1509 | * register_sysctl_table - register a sysctl hierarchy | |
1510 | * @table: the top-level table structure | |
1da177e4 LT |
1511 | * |
1512 | * Register a sysctl table hierarchy. @table should be a filled in ctl_table | |
1513 | * array. An entry with a ctl_name of 0 terminates the table. | |
1514 | * | |
1515 | * The members of the &ctl_table structure are used as follows: | |
1516 | * | |
1517 | * ctl_name - This is the numeric sysctl value used by sysctl(2). The number | |
1518 | * must be unique within that level of sysctl | |
1519 | * | |
1520 | * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not | |
1521 | * enter a sysctl file | |
1522 | * | |
1523 | * data - a pointer to data for use by proc_handler | |
1524 | * | |
1525 | * maxlen - the maximum size in bytes of the data | |
1526 | * | |
1527 | * mode - the file permissions for the /proc/sys file, and for sysctl(2) | |
1528 | * | |
1529 | * child - a pointer to the child sysctl table if this entry is a directory, or | |
1530 | * %NULL. | |
1531 | * | |
1532 | * proc_handler - the text handler routine (described below) | |
1533 | * | |
1534 | * strategy - the strategy routine (described below) | |
1535 | * | |
1536 | * de - for internal use by the sysctl routines | |
1537 | * | |
1538 | * extra1, extra2 - extra pointers usable by the proc handler routines | |
1539 | * | |
1540 | * Leaf nodes in the sysctl tree will be represented by a single file | |
1541 | * under /proc; non-leaf nodes will be represented by directories. | |
1542 | * | |
1543 | * sysctl(2) can automatically manage read and write requests through | |
1544 | * the sysctl table. The data and maxlen fields of the ctl_table | |
1545 | * struct enable minimal validation of the values being written to be | |
1546 | * performed, and the mode field allows minimal authentication. | |
1547 | * | |
1548 | * More sophisticated management can be enabled by the provision of a | |
1549 | * strategy routine with the table entry. This will be called before | |
1550 | * any automatic read or write of the data is performed. | |
1551 | * | |
1552 | * The strategy routine may return | |
1553 | * | |
1554 | * < 0 - Error occurred (error is passed to user process) | |
1555 | * | |
1556 | * 0 - OK - proceed with automatic read or write. | |
1557 | * | |
1558 | * > 0 - OK - read or write has been done by the strategy routine, so | |
1559 | * return immediately. | |
1560 | * | |
1561 | * There must be a proc_handler routine for any terminal nodes | |
1562 | * mirrored under /proc/sys (non-terminals are handled by a built-in | |
1563 | * directory handler). Several default handlers are available to | |
1564 | * cover common cases - | |
1565 | * | |
1566 | * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(), | |
1567 | * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(), | |
1568 | * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax() | |
1569 | * | |
1570 | * It is the handler's job to read the input buffer from user memory | |
1571 | * and process it. The handler should return 0 on success. | |
1572 | * | |
1573 | * This routine returns %NULL on a failure to register, and a pointer | |
1574 | * to the table header on success. | |
1575 | */ | |
0b4d4147 | 1576 | struct ctl_table_header *register_sysctl_table(ctl_table * table) |
1da177e4 LT |
1577 | { |
1578 | struct ctl_table_header *tmp; | |
1579 | tmp = kmalloc(sizeof(struct ctl_table_header), GFP_KERNEL); | |
1580 | if (!tmp) | |
1581 | return NULL; | |
1582 | tmp->ctl_table = table; | |
1583 | INIT_LIST_HEAD(&tmp->ctl_entry); | |
330d57fb AV |
1584 | tmp->used = 0; |
1585 | tmp->unregistering = NULL; | |
d912b0cc | 1586 | sysctl_set_parent(NULL, table); |
330d57fb | 1587 | spin_lock(&sysctl_lock); |
0b4d4147 | 1588 | list_add_tail(&tmp->ctl_entry, &root_table_header.ctl_entry); |
330d57fb | 1589 | spin_unlock(&sysctl_lock); |
1da177e4 LT |
1590 | return tmp; |
1591 | } | |
1592 | ||
1593 | /** | |
1594 | * unregister_sysctl_table - unregister a sysctl table hierarchy | |
1595 | * @header: the header returned from register_sysctl_table | |
1596 | * | |
1597 | * Unregisters the sysctl table and all children. proc entries may not | |
1598 | * actually be removed until they are no longer used by anyone. | |
1599 | */ | |
1600 | void unregister_sysctl_table(struct ctl_table_header * header) | |
1601 | { | |
330d57fb AV |
1602 | might_sleep(); |
1603 | spin_lock(&sysctl_lock); | |
1604 | start_unregistering(header); | |
330d57fb | 1605 | spin_unlock(&sysctl_lock); |
1da177e4 LT |
1606 | kfree(header); |
1607 | } | |
1608 | ||
b89a8171 | 1609 | #else /* !CONFIG_SYSCTL */ |
93a6fefe | 1610 | struct ctl_table_header *register_sysctl_table(ctl_table * table) |
b89a8171 EB |
1611 | { |
1612 | return NULL; | |
1613 | } | |
1614 | ||
1615 | void unregister_sysctl_table(struct ctl_table_header * table) | |
1616 | { | |
1617 | } | |
1618 | ||
1619 | #endif /* CONFIG_SYSCTL */ | |
1620 | ||
1da177e4 LT |
1621 | /* |
1622 | * /proc/sys support | |
1623 | */ | |
1624 | ||
b89a8171 | 1625 | #ifdef CONFIG_PROC_SYSCTL |
1da177e4 | 1626 | |
b1ba4ddd AB |
1627 | static int _proc_do_string(void* data, int maxlen, int write, |
1628 | struct file *filp, void __user *buffer, | |
1629 | size_t *lenp, loff_t *ppos) | |
1da177e4 LT |
1630 | { |
1631 | size_t len; | |
1632 | char __user *p; | |
1633 | char c; | |
8d060877 ON |
1634 | |
1635 | if (!data || !maxlen || !*lenp) { | |
1da177e4 LT |
1636 | *lenp = 0; |
1637 | return 0; | |
1638 | } | |
8d060877 | 1639 | |
1da177e4 LT |
1640 | if (write) { |
1641 | len = 0; | |
1642 | p = buffer; | |
1643 | while (len < *lenp) { | |
1644 | if (get_user(c, p++)) | |
1645 | return -EFAULT; | |
1646 | if (c == 0 || c == '\n') | |
1647 | break; | |
1648 | len++; | |
1649 | } | |
f5dd3d6f SV |
1650 | if (len >= maxlen) |
1651 | len = maxlen-1; | |
1652 | if(copy_from_user(data, buffer, len)) | |
1da177e4 | 1653 | return -EFAULT; |
f5dd3d6f | 1654 | ((char *) data)[len] = 0; |
1da177e4 LT |
1655 | *ppos += *lenp; |
1656 | } else { | |
f5dd3d6f SV |
1657 | len = strlen(data); |
1658 | if (len > maxlen) | |
1659 | len = maxlen; | |
8d060877 ON |
1660 | |
1661 | if (*ppos > len) { | |
1662 | *lenp = 0; | |
1663 | return 0; | |
1664 | } | |
1665 | ||
1666 | data += *ppos; | |
1667 | len -= *ppos; | |
1668 | ||
1da177e4 LT |
1669 | if (len > *lenp) |
1670 | len = *lenp; | |
1671 | if (len) | |
f5dd3d6f | 1672 | if(copy_to_user(buffer, data, len)) |
1da177e4 LT |
1673 | return -EFAULT; |
1674 | if (len < *lenp) { | |
1675 | if(put_user('\n', ((char __user *) buffer) + len)) | |
1676 | return -EFAULT; | |
1677 | len++; | |
1678 | } | |
1679 | *lenp = len; | |
1680 | *ppos += len; | |
1681 | } | |
1682 | return 0; | |
1683 | } | |
1684 | ||
f5dd3d6f SV |
1685 | /** |
1686 | * proc_dostring - read a string sysctl | |
1687 | * @table: the sysctl table | |
1688 | * @write: %TRUE if this is a write to the sysctl file | |
1689 | * @filp: the file structure | |
1690 | * @buffer: the user buffer | |
1691 | * @lenp: the size of the user buffer | |
1692 | * @ppos: file position | |
1693 | * | |
1694 | * Reads/writes a string from/to the user buffer. If the kernel | |
1695 | * buffer provided is not large enough to hold the string, the | |
1696 | * string is truncated. The copied string is %NULL-terminated. | |
1697 | * If the string is being read by the user process, it is copied | |
1698 | * and a newline '\n' is added. It is truncated if the buffer is | |
1699 | * not large enough. | |
1700 | * | |
1701 | * Returns 0 on success. | |
1702 | */ | |
1703 | int proc_dostring(ctl_table *table, int write, struct file *filp, | |
1704 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
1705 | { | |
1706 | return _proc_do_string(table->data, table->maxlen, write, filp, | |
1707 | buffer, lenp, ppos); | |
1708 | } | |
1709 | ||
1da177e4 LT |
1710 | |
1711 | static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp, | |
1712 | int *valp, | |
1713 | int write, void *data) | |
1714 | { | |
1715 | if (write) { | |
1716 | *valp = *negp ? -*lvalp : *lvalp; | |
1717 | } else { | |
1718 | int val = *valp; | |
1719 | if (val < 0) { | |
1720 | *negp = -1; | |
1721 | *lvalp = (unsigned long)-val; | |
1722 | } else { | |
1723 | *negp = 0; | |
1724 | *lvalp = (unsigned long)val; | |
1725 | } | |
1726 | } | |
1727 | return 0; | |
1728 | } | |
1729 | ||
fcfbd547 KK |
1730 | static int __do_proc_dointvec(void *tbl_data, ctl_table *table, |
1731 | int write, struct file *filp, void __user *buffer, | |
1732 | size_t *lenp, loff_t *ppos, | |
1da177e4 LT |
1733 | int (*conv)(int *negp, unsigned long *lvalp, int *valp, |
1734 | int write, void *data), | |
1735 | void *data) | |
1736 | { | |
1737 | #define TMPBUFLEN 21 | |
1738 | int *i, vleft, first=1, neg, val; | |
1739 | unsigned long lval; | |
1740 | size_t left, len; | |
1741 | ||
1742 | char buf[TMPBUFLEN], *p; | |
1743 | char __user *s = buffer; | |
1744 | ||
fcfbd547 | 1745 | if (!tbl_data || !table->maxlen || !*lenp || |
1da177e4 LT |
1746 | (*ppos && !write)) { |
1747 | *lenp = 0; | |
1748 | return 0; | |
1749 | } | |
1750 | ||
fcfbd547 | 1751 | i = (int *) tbl_data; |
1da177e4 LT |
1752 | vleft = table->maxlen / sizeof(*i); |
1753 | left = *lenp; | |
1754 | ||
1755 | if (!conv) | |
1756 | conv = do_proc_dointvec_conv; | |
1757 | ||
1758 | for (; left && vleft--; i++, first=0) { | |
1759 | if (write) { | |
1760 | while (left) { | |
1761 | char c; | |
1762 | if (get_user(c, s)) | |
1763 | return -EFAULT; | |
1764 | if (!isspace(c)) | |
1765 | break; | |
1766 | left--; | |
1767 | s++; | |
1768 | } | |
1769 | if (!left) | |
1770 | break; | |
1771 | neg = 0; | |
1772 | len = left; | |
1773 | if (len > sizeof(buf) - 1) | |
1774 | len = sizeof(buf) - 1; | |
1775 | if (copy_from_user(buf, s, len)) | |
1776 | return -EFAULT; | |
1777 | buf[len] = 0; | |
1778 | p = buf; | |
1779 | if (*p == '-' && left > 1) { | |
1780 | neg = 1; | |
bd9b0bac | 1781 | p++; |
1da177e4 LT |
1782 | } |
1783 | if (*p < '0' || *p > '9') | |
1784 | break; | |
1785 | ||
1786 | lval = simple_strtoul(p, &p, 0); | |
1787 | ||
1788 | len = p-buf; | |
1789 | if ((len < left) && *p && !isspace(*p)) | |
1790 | break; | |
1791 | if (neg) | |
1792 | val = -val; | |
1793 | s += len; | |
1794 | left -= len; | |
1795 | ||
1796 | if (conv(&neg, &lval, i, 1, data)) | |
1797 | break; | |
1798 | } else { | |
1799 | p = buf; | |
1800 | if (!first) | |
1801 | *p++ = '\t'; | |
1802 | ||
1803 | if (conv(&neg, &lval, i, 0, data)) | |
1804 | break; | |
1805 | ||
1806 | sprintf(p, "%s%lu", neg ? "-" : "", lval); | |
1807 | len = strlen(buf); | |
1808 | if (len > left) | |
1809 | len = left; | |
1810 | if(copy_to_user(s, buf, len)) | |
1811 | return -EFAULT; | |
1812 | left -= len; | |
1813 | s += len; | |
1814 | } | |
1815 | } | |
1816 | ||
1817 | if (!write && !first && left) { | |
1818 | if(put_user('\n', s)) | |
1819 | return -EFAULT; | |
1820 | left--, s++; | |
1821 | } | |
1822 | if (write) { | |
1823 | while (left) { | |
1824 | char c; | |
1825 | if (get_user(c, s++)) | |
1826 | return -EFAULT; | |
1827 | if (!isspace(c)) | |
1828 | break; | |
1829 | left--; | |
1830 | } | |
1831 | } | |
1832 | if (write && first) | |
1833 | return -EINVAL; | |
1834 | *lenp -= left; | |
1835 | *ppos += *lenp; | |
1836 | return 0; | |
1837 | #undef TMPBUFLEN | |
1838 | } | |
1839 | ||
fcfbd547 KK |
1840 | static int do_proc_dointvec(ctl_table *table, int write, struct file *filp, |
1841 | void __user *buffer, size_t *lenp, loff_t *ppos, | |
1842 | int (*conv)(int *negp, unsigned long *lvalp, int *valp, | |
1843 | int write, void *data), | |
1844 | void *data) | |
1845 | { | |
1846 | return __do_proc_dointvec(table->data, table, write, filp, | |
1847 | buffer, lenp, ppos, conv, data); | |
1848 | } | |
1849 | ||
1da177e4 LT |
1850 | /** |
1851 | * proc_dointvec - read a vector of integers | |
1852 | * @table: the sysctl table | |
1853 | * @write: %TRUE if this is a write to the sysctl file | |
1854 | * @filp: the file structure | |
1855 | * @buffer: the user buffer | |
1856 | * @lenp: the size of the user buffer | |
1857 | * @ppos: file position | |
1858 | * | |
1859 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer | |
1860 | * values from/to the user buffer, treated as an ASCII string. | |
1861 | * | |
1862 | * Returns 0 on success. | |
1863 | */ | |
1864 | int proc_dointvec(ctl_table *table, int write, struct file *filp, | |
1865 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
1866 | { | |
1867 | return do_proc_dointvec(table,write,filp,buffer,lenp,ppos, | |
1868 | NULL,NULL); | |
1869 | } | |
1870 | ||
1871 | #define OP_SET 0 | |
1872 | #define OP_AND 1 | |
34f5a398 | 1873 | #define OP_OR 2 |
1da177e4 LT |
1874 | |
1875 | static int do_proc_dointvec_bset_conv(int *negp, unsigned long *lvalp, | |
1876 | int *valp, | |
1877 | int write, void *data) | |
1878 | { | |
1879 | int op = *(int *)data; | |
1880 | if (write) { | |
1881 | int val = *negp ? -*lvalp : *lvalp; | |
1882 | switch(op) { | |
1883 | case OP_SET: *valp = val; break; | |
1884 | case OP_AND: *valp &= val; break; | |
34f5a398 | 1885 | case OP_OR: *valp |= val; break; |
1da177e4 LT |
1886 | } |
1887 | } else { | |
1888 | int val = *valp; | |
1889 | if (val < 0) { | |
1890 | *negp = -1; | |
1891 | *lvalp = (unsigned long)-val; | |
1892 | } else { | |
1893 | *negp = 0; | |
1894 | *lvalp = (unsigned long)val; | |
1895 | } | |
1896 | } | |
1897 | return 0; | |
1898 | } | |
1899 | ||
1900 | /* | |
1901 | * init may raise the set. | |
1902 | */ | |
1903 | ||
1904 | int proc_dointvec_bset(ctl_table *table, int write, struct file *filp, | |
1905 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
1906 | { | |
1907 | int op; | |
1908 | ||
6ff1b442 | 1909 | if (write && !capable(CAP_SYS_MODULE)) { |
1da177e4 LT |
1910 | return -EPERM; |
1911 | } | |
1912 | ||
f400e198 | 1913 | op = is_init(current) ? OP_SET : OP_AND; |
1da177e4 LT |
1914 | return do_proc_dointvec(table,write,filp,buffer,lenp,ppos, |
1915 | do_proc_dointvec_bset_conv,&op); | |
1916 | } | |
1917 | ||
34f5a398 TT |
1918 | /* |
1919 | * Taint values can only be increased | |
1920 | */ | |
1921 | static int proc_dointvec_taint(ctl_table *table, int write, struct file *filp, | |
1922 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
1923 | { | |
1924 | int op; | |
1925 | ||
91fcd412 | 1926 | if (write && !capable(CAP_SYS_ADMIN)) |
34f5a398 TT |
1927 | return -EPERM; |
1928 | ||
1929 | op = OP_OR; | |
1930 | return do_proc_dointvec(table,write,filp,buffer,lenp,ppos, | |
1931 | do_proc_dointvec_bset_conv,&op); | |
1932 | } | |
1933 | ||
1da177e4 LT |
1934 | struct do_proc_dointvec_minmax_conv_param { |
1935 | int *min; | |
1936 | int *max; | |
1937 | }; | |
1938 | ||
1939 | static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp, | |
1940 | int *valp, | |
1941 | int write, void *data) | |
1942 | { | |
1943 | struct do_proc_dointvec_minmax_conv_param *param = data; | |
1944 | if (write) { | |
1945 | int val = *negp ? -*lvalp : *lvalp; | |
1946 | if ((param->min && *param->min > val) || | |
1947 | (param->max && *param->max < val)) | |
1948 | return -EINVAL; | |
1949 | *valp = val; | |
1950 | } else { | |
1951 | int val = *valp; | |
1952 | if (val < 0) { | |
1953 | *negp = -1; | |
1954 | *lvalp = (unsigned long)-val; | |
1955 | } else { | |
1956 | *negp = 0; | |
1957 | *lvalp = (unsigned long)val; | |
1958 | } | |
1959 | } | |
1960 | return 0; | |
1961 | } | |
1962 | ||
1963 | /** | |
1964 | * proc_dointvec_minmax - read a vector of integers with min/max values | |
1965 | * @table: the sysctl table | |
1966 | * @write: %TRUE if this is a write to the sysctl file | |
1967 | * @filp: the file structure | |
1968 | * @buffer: the user buffer | |
1969 | * @lenp: the size of the user buffer | |
1970 | * @ppos: file position | |
1971 | * | |
1972 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer | |
1973 | * values from/to the user buffer, treated as an ASCII string. | |
1974 | * | |
1975 | * This routine will ensure the values are within the range specified by | |
1976 | * table->extra1 (min) and table->extra2 (max). | |
1977 | * | |
1978 | * Returns 0 on success. | |
1979 | */ | |
1980 | int proc_dointvec_minmax(ctl_table *table, int write, struct file *filp, | |
1981 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
1982 | { | |
1983 | struct do_proc_dointvec_minmax_conv_param param = { | |
1984 | .min = (int *) table->extra1, | |
1985 | .max = (int *) table->extra2, | |
1986 | }; | |
1987 | return do_proc_dointvec(table, write, filp, buffer, lenp, ppos, | |
1988 | do_proc_dointvec_minmax_conv, ¶m); | |
1989 | } | |
1990 | ||
fcfbd547 | 1991 | static int __do_proc_doulongvec_minmax(void *data, ctl_table *table, int write, |
1da177e4 LT |
1992 | struct file *filp, |
1993 | void __user *buffer, | |
1994 | size_t *lenp, loff_t *ppos, | |
1995 | unsigned long convmul, | |
1996 | unsigned long convdiv) | |
1997 | { | |
1998 | #define TMPBUFLEN 21 | |
1999 | unsigned long *i, *min, *max, val; | |
2000 | int vleft, first=1, neg; | |
2001 | size_t len, left; | |
2002 | char buf[TMPBUFLEN], *p; | |
2003 | char __user *s = buffer; | |
2004 | ||
fcfbd547 | 2005 | if (!data || !table->maxlen || !*lenp || |
1da177e4 LT |
2006 | (*ppos && !write)) { |
2007 | *lenp = 0; | |
2008 | return 0; | |
2009 | } | |
2010 | ||
fcfbd547 | 2011 | i = (unsigned long *) data; |
1da177e4 LT |
2012 | min = (unsigned long *) table->extra1; |
2013 | max = (unsigned long *) table->extra2; | |
2014 | vleft = table->maxlen / sizeof(unsigned long); | |
2015 | left = *lenp; | |
2016 | ||
2017 | for (; left && vleft--; i++, min++, max++, first=0) { | |
2018 | if (write) { | |
2019 | while (left) { | |
2020 | char c; | |
2021 | if (get_user(c, s)) | |
2022 | return -EFAULT; | |
2023 | if (!isspace(c)) | |
2024 | break; | |
2025 | left--; | |
2026 | s++; | |
2027 | } | |
2028 | if (!left) | |
2029 | break; | |
2030 | neg = 0; | |
2031 | len = left; | |
2032 | if (len > TMPBUFLEN-1) | |
2033 | len = TMPBUFLEN-1; | |
2034 | if (copy_from_user(buf, s, len)) | |
2035 | return -EFAULT; | |
2036 | buf[len] = 0; | |
2037 | p = buf; | |
2038 | if (*p == '-' && left > 1) { | |
2039 | neg = 1; | |
bd9b0bac | 2040 | p++; |
1da177e4 LT |
2041 | } |
2042 | if (*p < '0' || *p > '9') | |
2043 | break; | |
2044 | val = simple_strtoul(p, &p, 0) * convmul / convdiv ; | |
2045 | len = p-buf; | |
2046 | if ((len < left) && *p && !isspace(*p)) | |
2047 | break; | |
2048 | if (neg) | |
2049 | val = -val; | |
2050 | s += len; | |
2051 | left -= len; | |
2052 | ||
2053 | if(neg) | |
2054 | continue; | |
2055 | if ((min && val < *min) || (max && val > *max)) | |
2056 | continue; | |
2057 | *i = val; | |
2058 | } else { | |
2059 | p = buf; | |
2060 | if (!first) | |
2061 | *p++ = '\t'; | |
2062 | sprintf(p, "%lu", convdiv * (*i) / convmul); | |
2063 | len = strlen(buf); | |
2064 | if (len > left) | |
2065 | len = left; | |
2066 | if(copy_to_user(s, buf, len)) | |
2067 | return -EFAULT; | |
2068 | left -= len; | |
2069 | s += len; | |
2070 | } | |
2071 | } | |
2072 | ||
2073 | if (!write && !first && left) { | |
2074 | if(put_user('\n', s)) | |
2075 | return -EFAULT; | |
2076 | left--, s++; | |
2077 | } | |
2078 | if (write) { | |
2079 | while (left) { | |
2080 | char c; | |
2081 | if (get_user(c, s++)) | |
2082 | return -EFAULT; | |
2083 | if (!isspace(c)) | |
2084 | break; | |
2085 | left--; | |
2086 | } | |
2087 | } | |
2088 | if (write && first) | |
2089 | return -EINVAL; | |
2090 | *lenp -= left; | |
2091 | *ppos += *lenp; | |
2092 | return 0; | |
2093 | #undef TMPBUFLEN | |
2094 | } | |
2095 | ||
fcfbd547 KK |
2096 | static int do_proc_doulongvec_minmax(ctl_table *table, int write, |
2097 | struct file *filp, | |
2098 | void __user *buffer, | |
2099 | size_t *lenp, loff_t *ppos, | |
2100 | unsigned long convmul, | |
2101 | unsigned long convdiv) | |
2102 | { | |
2103 | return __do_proc_doulongvec_minmax(table->data, table, write, | |
2104 | filp, buffer, lenp, ppos, convmul, convdiv); | |
2105 | } | |
2106 | ||
1da177e4 LT |
2107 | /** |
2108 | * proc_doulongvec_minmax - read a vector of long integers with min/max values | |
2109 | * @table: the sysctl table | |
2110 | * @write: %TRUE if this is a write to the sysctl file | |
2111 | * @filp: the file structure | |
2112 | * @buffer: the user buffer | |
2113 | * @lenp: the size of the user buffer | |
2114 | * @ppos: file position | |
2115 | * | |
2116 | * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long | |
2117 | * values from/to the user buffer, treated as an ASCII string. | |
2118 | * | |
2119 | * This routine will ensure the values are within the range specified by | |
2120 | * table->extra1 (min) and table->extra2 (max). | |
2121 | * | |
2122 | * Returns 0 on success. | |
2123 | */ | |
2124 | int proc_doulongvec_minmax(ctl_table *table, int write, struct file *filp, | |
2125 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2126 | { | |
2127 | return do_proc_doulongvec_minmax(table, write, filp, buffer, lenp, ppos, 1l, 1l); | |
2128 | } | |
2129 | ||
2130 | /** | |
2131 | * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values | |
2132 | * @table: the sysctl table | |
2133 | * @write: %TRUE if this is a write to the sysctl file | |
2134 | * @filp: the file structure | |
2135 | * @buffer: the user buffer | |
2136 | * @lenp: the size of the user buffer | |
2137 | * @ppos: file position | |
2138 | * | |
2139 | * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long | |
2140 | * values from/to the user buffer, treated as an ASCII string. The values | |
2141 | * are treated as milliseconds, and converted to jiffies when they are stored. | |
2142 | * | |
2143 | * This routine will ensure the values are within the range specified by | |
2144 | * table->extra1 (min) and table->extra2 (max). | |
2145 | * | |
2146 | * Returns 0 on success. | |
2147 | */ | |
2148 | int proc_doulongvec_ms_jiffies_minmax(ctl_table *table, int write, | |
2149 | struct file *filp, | |
2150 | void __user *buffer, | |
2151 | size_t *lenp, loff_t *ppos) | |
2152 | { | |
2153 | return do_proc_doulongvec_minmax(table, write, filp, buffer, | |
2154 | lenp, ppos, HZ, 1000l); | |
2155 | } | |
2156 | ||
2157 | ||
2158 | static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp, | |
2159 | int *valp, | |
2160 | int write, void *data) | |
2161 | { | |
2162 | if (write) { | |
cba9f33d BS |
2163 | if (*lvalp > LONG_MAX / HZ) |
2164 | return 1; | |
1da177e4 LT |
2165 | *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ); |
2166 | } else { | |
2167 | int val = *valp; | |
2168 | unsigned long lval; | |
2169 | if (val < 0) { | |
2170 | *negp = -1; | |
2171 | lval = (unsigned long)-val; | |
2172 | } else { | |
2173 | *negp = 0; | |
2174 | lval = (unsigned long)val; | |
2175 | } | |
2176 | *lvalp = lval / HZ; | |
2177 | } | |
2178 | return 0; | |
2179 | } | |
2180 | ||
2181 | static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp, | |
2182 | int *valp, | |
2183 | int write, void *data) | |
2184 | { | |
2185 | if (write) { | |
cba9f33d BS |
2186 | if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ) |
2187 | return 1; | |
1da177e4 LT |
2188 | *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp); |
2189 | } else { | |
2190 | int val = *valp; | |
2191 | unsigned long lval; | |
2192 | if (val < 0) { | |
2193 | *negp = -1; | |
2194 | lval = (unsigned long)-val; | |
2195 | } else { | |
2196 | *negp = 0; | |
2197 | lval = (unsigned long)val; | |
2198 | } | |
2199 | *lvalp = jiffies_to_clock_t(lval); | |
2200 | } | |
2201 | return 0; | |
2202 | } | |
2203 | ||
2204 | static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp, | |
2205 | int *valp, | |
2206 | int write, void *data) | |
2207 | { | |
2208 | if (write) { | |
2209 | *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp); | |
2210 | } else { | |
2211 | int val = *valp; | |
2212 | unsigned long lval; | |
2213 | if (val < 0) { | |
2214 | *negp = -1; | |
2215 | lval = (unsigned long)-val; | |
2216 | } else { | |
2217 | *negp = 0; | |
2218 | lval = (unsigned long)val; | |
2219 | } | |
2220 | *lvalp = jiffies_to_msecs(lval); | |
2221 | } | |
2222 | return 0; | |
2223 | } | |
2224 | ||
2225 | /** | |
2226 | * proc_dointvec_jiffies - read a vector of integers as seconds | |
2227 | * @table: the sysctl table | |
2228 | * @write: %TRUE if this is a write to the sysctl file | |
2229 | * @filp: the file structure | |
2230 | * @buffer: the user buffer | |
2231 | * @lenp: the size of the user buffer | |
2232 | * @ppos: file position | |
2233 | * | |
2234 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer | |
2235 | * values from/to the user buffer, treated as an ASCII string. | |
2236 | * The values read are assumed to be in seconds, and are converted into | |
2237 | * jiffies. | |
2238 | * | |
2239 | * Returns 0 on success. | |
2240 | */ | |
2241 | int proc_dointvec_jiffies(ctl_table *table, int write, struct file *filp, | |
2242 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2243 | { | |
2244 | return do_proc_dointvec(table,write,filp,buffer,lenp,ppos, | |
2245 | do_proc_dointvec_jiffies_conv,NULL); | |
2246 | } | |
2247 | ||
2248 | /** | |
2249 | * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds | |
2250 | * @table: the sysctl table | |
2251 | * @write: %TRUE if this is a write to the sysctl file | |
2252 | * @filp: the file structure | |
2253 | * @buffer: the user buffer | |
2254 | * @lenp: the size of the user buffer | |
1e5d5331 | 2255 | * @ppos: pointer to the file position |
1da177e4 LT |
2256 | * |
2257 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer | |
2258 | * values from/to the user buffer, treated as an ASCII string. | |
2259 | * The values read are assumed to be in 1/USER_HZ seconds, and | |
2260 | * are converted into jiffies. | |
2261 | * | |
2262 | * Returns 0 on success. | |
2263 | */ | |
2264 | int proc_dointvec_userhz_jiffies(ctl_table *table, int write, struct file *filp, | |
2265 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2266 | { | |
2267 | return do_proc_dointvec(table,write,filp,buffer,lenp,ppos, | |
2268 | do_proc_dointvec_userhz_jiffies_conv,NULL); | |
2269 | } | |
2270 | ||
2271 | /** | |
2272 | * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds | |
2273 | * @table: the sysctl table | |
2274 | * @write: %TRUE if this is a write to the sysctl file | |
2275 | * @filp: the file structure | |
2276 | * @buffer: the user buffer | |
2277 | * @lenp: the size of the user buffer | |
67be2dd1 MW |
2278 | * @ppos: file position |
2279 | * @ppos: the current position in the file | |
1da177e4 LT |
2280 | * |
2281 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer | |
2282 | * values from/to the user buffer, treated as an ASCII string. | |
2283 | * The values read are assumed to be in 1/1000 seconds, and | |
2284 | * are converted into jiffies. | |
2285 | * | |
2286 | * Returns 0 on success. | |
2287 | */ | |
2288 | int proc_dointvec_ms_jiffies(ctl_table *table, int write, struct file *filp, | |
2289 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2290 | { | |
2291 | return do_proc_dointvec(table, write, filp, buffer, lenp, ppos, | |
2292 | do_proc_dointvec_ms_jiffies_conv, NULL); | |
2293 | } | |
2294 | ||
9ec52099 CLG |
2295 | static int proc_do_cad_pid(ctl_table *table, int write, struct file *filp, |
2296 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2297 | { | |
2298 | struct pid *new_pid; | |
2299 | pid_t tmp; | |
2300 | int r; | |
2301 | ||
2302 | tmp = pid_nr(cad_pid); | |
2303 | ||
2304 | r = __do_proc_dointvec(&tmp, table, write, filp, buffer, | |
2305 | lenp, ppos, NULL, NULL); | |
2306 | if (r || !write) | |
2307 | return r; | |
2308 | ||
2309 | new_pid = find_get_pid(tmp); | |
2310 | if (!new_pid) | |
2311 | return -ESRCH; | |
2312 | ||
2313 | put_pid(xchg(&cad_pid, new_pid)); | |
2314 | return 0; | |
2315 | } | |
2316 | ||
1da177e4 LT |
2317 | #else /* CONFIG_PROC_FS */ |
2318 | ||
2319 | int proc_dostring(ctl_table *table, int write, struct file *filp, | |
2320 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2321 | { | |
2322 | return -ENOSYS; | |
2323 | } | |
2324 | ||
1da177e4 LT |
2325 | int proc_dointvec(ctl_table *table, int write, struct file *filp, |
2326 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2327 | { | |
2328 | return -ENOSYS; | |
2329 | } | |
2330 | ||
2331 | int proc_dointvec_bset(ctl_table *table, int write, struct file *filp, | |
2332 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2333 | { | |
2334 | return -ENOSYS; | |
2335 | } | |
2336 | ||
2337 | int proc_dointvec_minmax(ctl_table *table, int write, struct file *filp, | |
2338 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2339 | { | |
2340 | return -ENOSYS; | |
2341 | } | |
2342 | ||
2343 | int proc_dointvec_jiffies(ctl_table *table, int write, struct file *filp, | |
2344 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2345 | { | |
2346 | return -ENOSYS; | |
2347 | } | |
2348 | ||
2349 | int proc_dointvec_userhz_jiffies(ctl_table *table, int write, struct file *filp, | |
2350 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2351 | { | |
2352 | return -ENOSYS; | |
2353 | } | |
2354 | ||
2355 | int proc_dointvec_ms_jiffies(ctl_table *table, int write, struct file *filp, | |
2356 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2357 | { | |
2358 | return -ENOSYS; | |
2359 | } | |
2360 | ||
2361 | int proc_doulongvec_minmax(ctl_table *table, int write, struct file *filp, | |
2362 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2363 | { | |
2364 | return -ENOSYS; | |
2365 | } | |
2366 | ||
2367 | int proc_doulongvec_ms_jiffies_minmax(ctl_table *table, int write, | |
2368 | struct file *filp, | |
2369 | void __user *buffer, | |
2370 | size_t *lenp, loff_t *ppos) | |
2371 | { | |
2372 | return -ENOSYS; | |
2373 | } | |
2374 | ||
2375 | ||
2376 | #endif /* CONFIG_PROC_FS */ | |
2377 | ||
2378 | ||
b89a8171 | 2379 | #ifdef CONFIG_SYSCTL_SYSCALL |
1da177e4 LT |
2380 | /* |
2381 | * General sysctl support routines | |
2382 | */ | |
2383 | ||
2384 | /* The generic string strategy routine: */ | |
2385 | int sysctl_string(ctl_table *table, int __user *name, int nlen, | |
2386 | void __user *oldval, size_t __user *oldlenp, | |
1f29bcd7 | 2387 | void __user *newval, size_t newlen) |
1da177e4 | 2388 | { |
1da177e4 LT |
2389 | if (!table->data || !table->maxlen) |
2390 | return -ENOTDIR; | |
2391 | ||
2392 | if (oldval && oldlenp) { | |
de9e007d LT |
2393 | size_t bufsize; |
2394 | if (get_user(bufsize, oldlenp)) | |
1da177e4 | 2395 | return -EFAULT; |
de9e007d LT |
2396 | if (bufsize) { |
2397 | size_t len = strlen(table->data), copied; | |
2398 | ||
2399 | /* This shouldn't trigger for a well-formed sysctl */ | |
2400 | if (len > table->maxlen) | |
1da177e4 | 2401 | len = table->maxlen; |
de9e007d LT |
2402 | |
2403 | /* Copy up to a max of bufsize-1 bytes of the string */ | |
2404 | copied = (len >= bufsize) ? bufsize - 1 : len; | |
2405 | ||
2406 | if (copy_to_user(oldval, table->data, copied) || | |
2407 | put_user(0, (char __user *)(oldval + copied))) | |
1da177e4 | 2408 | return -EFAULT; |
de9e007d | 2409 | if (put_user(len, oldlenp)) |
1da177e4 LT |
2410 | return -EFAULT; |
2411 | } | |
2412 | } | |
2413 | if (newval && newlen) { | |
de9e007d | 2414 | size_t len = newlen; |
1da177e4 LT |
2415 | if (len > table->maxlen) |
2416 | len = table->maxlen; | |
2417 | if(copy_from_user(table->data, newval, len)) | |
2418 | return -EFAULT; | |
2419 | if (len == table->maxlen) | |
2420 | len--; | |
2421 | ((char *) table->data)[len] = 0; | |
2422 | } | |
82c9df82 | 2423 | return 1; |
1da177e4 LT |
2424 | } |
2425 | ||
2426 | /* | |
2427 | * This function makes sure that all of the integers in the vector | |
2428 | * are between the minimum and maximum values given in the arrays | |
2429 | * table->extra1 and table->extra2, respectively. | |
2430 | */ | |
2431 | int sysctl_intvec(ctl_table *table, int __user *name, int nlen, | |
2432 | void __user *oldval, size_t __user *oldlenp, | |
1f29bcd7 | 2433 | void __user *newval, size_t newlen) |
1da177e4 LT |
2434 | { |
2435 | ||
2436 | if (newval && newlen) { | |
2437 | int __user *vec = (int __user *) newval; | |
2438 | int *min = (int *) table->extra1; | |
2439 | int *max = (int *) table->extra2; | |
2440 | size_t length; | |
2441 | int i; | |
2442 | ||
2443 | if (newlen % sizeof(int) != 0) | |
2444 | return -EINVAL; | |
2445 | ||
2446 | if (!table->extra1 && !table->extra2) | |
2447 | return 0; | |
2448 | ||
2449 | if (newlen > table->maxlen) | |
2450 | newlen = table->maxlen; | |
2451 | length = newlen / sizeof(int); | |
2452 | ||
2453 | for (i = 0; i < length; i++) { | |
2454 | int value; | |
2455 | if (get_user(value, vec + i)) | |
2456 | return -EFAULT; | |
2457 | if (min && value < min[i]) | |
2458 | return -EINVAL; | |
2459 | if (max && value > max[i]) | |
2460 | return -EINVAL; | |
2461 | } | |
2462 | } | |
2463 | return 0; | |
2464 | } | |
2465 | ||
2466 | /* Strategy function to convert jiffies to seconds */ | |
2467 | int sysctl_jiffies(ctl_table *table, int __user *name, int nlen, | |
2468 | void __user *oldval, size_t __user *oldlenp, | |
1f29bcd7 | 2469 | void __user *newval, size_t newlen) |
1da177e4 | 2470 | { |
3ee75ac3 | 2471 | if (oldval && oldlenp) { |
1da177e4 | 2472 | size_t olen; |
3ee75ac3 AD |
2473 | |
2474 | if (get_user(olen, oldlenp)) | |
2475 | return -EFAULT; | |
2476 | if (olen) { | |
2477 | int val; | |
2478 | ||
2479 | if (olen < sizeof(int)) | |
2480 | return -EINVAL; | |
2481 | ||
2482 | val = *(int *)(table->data) / HZ; | |
2483 | if (put_user(val, (int __user *)oldval)) | |
2484 | return -EFAULT; | |
2485 | if (put_user(sizeof(int), oldlenp)) | |
1da177e4 | 2486 | return -EFAULT; |
1da177e4 | 2487 | } |
1da177e4 LT |
2488 | } |
2489 | if (newval && newlen) { | |
2490 | int new; | |
2491 | if (newlen != sizeof(int)) | |
2492 | return -EINVAL; | |
2493 | if (get_user(new, (int __user *)newval)) | |
2494 | return -EFAULT; | |
2495 | *(int *)(table->data) = new*HZ; | |
2496 | } | |
2497 | return 1; | |
2498 | } | |
2499 | ||
2500 | /* Strategy function to convert jiffies to seconds */ | |
2501 | int sysctl_ms_jiffies(ctl_table *table, int __user *name, int nlen, | |
2502 | void __user *oldval, size_t __user *oldlenp, | |
1f29bcd7 | 2503 | void __user *newval, size_t newlen) |
1da177e4 | 2504 | { |
3ee75ac3 | 2505 | if (oldval && oldlenp) { |
1da177e4 | 2506 | size_t olen; |
3ee75ac3 AD |
2507 | |
2508 | if (get_user(olen, oldlenp)) | |
2509 | return -EFAULT; | |
2510 | if (olen) { | |
2511 | int val; | |
2512 | ||
2513 | if (olen < sizeof(int)) | |
2514 | return -EINVAL; | |
2515 | ||
2516 | val = jiffies_to_msecs(*(int *)(table->data)); | |
2517 | if (put_user(val, (int __user *)oldval)) | |
2518 | return -EFAULT; | |
2519 | if (put_user(sizeof(int), oldlenp)) | |
1da177e4 | 2520 | return -EFAULT; |
1da177e4 | 2521 | } |
1da177e4 LT |
2522 | } |
2523 | if (newval && newlen) { | |
2524 | int new; | |
2525 | if (newlen != sizeof(int)) | |
2526 | return -EINVAL; | |
2527 | if (get_user(new, (int __user *)newval)) | |
2528 | return -EFAULT; | |
2529 | *(int *)(table->data) = msecs_to_jiffies(new); | |
2530 | } | |
2531 | return 1; | |
2532 | } | |
2533 | ||
c4b8b769 | 2534 | |
c4b8b769 | 2535 | |
b89a8171 | 2536 | #else /* CONFIG_SYSCTL_SYSCALL */ |
1da177e4 LT |
2537 | |
2538 | ||
2539 | asmlinkage long sys_sysctl(struct __sysctl_args __user *args) | |
2540 | { | |
b89a8171 | 2541 | static int msg_count; |
0e009be8 EB |
2542 | struct __sysctl_args tmp; |
2543 | int name[CTL_MAXNAME]; | |
2544 | int i; | |
2545 | ||
2546 | /* Read in the sysctl name for better debug message logging */ | |
2547 | if (copy_from_user(&tmp, args, sizeof(tmp))) | |
2548 | return -EFAULT; | |
2549 | if (tmp.nlen <= 0 || tmp.nlen >= CTL_MAXNAME) | |
2550 | return -ENOTDIR; | |
2551 | for (i = 0; i < tmp.nlen; i++) | |
2552 | if (get_user(name[i], tmp.name + i)) | |
2553 | return -EFAULT; | |
2554 | ||
2555 | /* Ignore accesses to kernel.version */ | |
2556 | if ((tmp.nlen == 2) && (name[0] == CTL_KERN) && (name[1] == KERN_VERSION)) | |
2557 | goto out; | |
b89a8171 EB |
2558 | |
2559 | if (msg_count < 5) { | |
2560 | msg_count++; | |
2561 | printk(KERN_INFO | |
2562 | "warning: process `%s' used the removed sysctl " | |
0e009be8 EB |
2563 | "system call with ", current->comm); |
2564 | for (i = 0; i < tmp.nlen; i++) | |
2565 | printk("%d.", name[i]); | |
2566 | printk("\n"); | |
b89a8171 | 2567 | } |
0e009be8 | 2568 | out: |
1da177e4 LT |
2569 | return -ENOSYS; |
2570 | } | |
2571 | ||
2572 | int sysctl_string(ctl_table *table, int __user *name, int nlen, | |
2573 | void __user *oldval, size_t __user *oldlenp, | |
1f29bcd7 | 2574 | void __user *newval, size_t newlen) |
1da177e4 LT |
2575 | { |
2576 | return -ENOSYS; | |
2577 | } | |
2578 | ||
2579 | int sysctl_intvec(ctl_table *table, int __user *name, int nlen, | |
2580 | void __user *oldval, size_t __user *oldlenp, | |
1f29bcd7 | 2581 | void __user *newval, size_t newlen) |
1da177e4 LT |
2582 | { |
2583 | return -ENOSYS; | |
2584 | } | |
2585 | ||
2586 | int sysctl_jiffies(ctl_table *table, int __user *name, int nlen, | |
2587 | void __user *oldval, size_t __user *oldlenp, | |
1f29bcd7 | 2588 | void __user *newval, size_t newlen) |
1da177e4 LT |
2589 | { |
2590 | return -ENOSYS; | |
2591 | } | |
2592 | ||
2593 | int sysctl_ms_jiffies(ctl_table *table, int __user *name, int nlen, | |
2594 | void __user *oldval, size_t __user *oldlenp, | |
1f29bcd7 | 2595 | void __user *newval, size_t newlen) |
1da177e4 LT |
2596 | { |
2597 | return -ENOSYS; | |
2598 | } | |
2599 | ||
b89a8171 | 2600 | #endif /* CONFIG_SYSCTL_SYSCALL */ |
1da177e4 LT |
2601 | |
2602 | /* | |
2603 | * No sense putting this after each symbol definition, twice, | |
2604 | * exception granted :-) | |
2605 | */ | |
2606 | EXPORT_SYMBOL(proc_dointvec); | |
2607 | EXPORT_SYMBOL(proc_dointvec_jiffies); | |
2608 | EXPORT_SYMBOL(proc_dointvec_minmax); | |
2609 | EXPORT_SYMBOL(proc_dointvec_userhz_jiffies); | |
2610 | EXPORT_SYMBOL(proc_dointvec_ms_jiffies); | |
2611 | EXPORT_SYMBOL(proc_dostring); | |
2612 | EXPORT_SYMBOL(proc_doulongvec_minmax); | |
2613 | EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax); | |
2614 | EXPORT_SYMBOL(register_sysctl_table); | |
2615 | EXPORT_SYMBOL(sysctl_intvec); | |
2616 | EXPORT_SYMBOL(sysctl_jiffies); | |
2617 | EXPORT_SYMBOL(sysctl_ms_jiffies); | |
2618 | EXPORT_SYMBOL(sysctl_string); | |
2619 | EXPORT_SYMBOL(unregister_sysctl_table); |