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