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