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sysctl: refactor sysctl string writing logic
[deliverable/linux.git] / kernel / sysctl.c
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
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/bitmap.h>
27 #include <linux/signal.h>
28 #include <linux/printk.h>
29 #include <linux/proc_fs.h>
30 #include <linux/security.h>
31 #include <linux/ctype.h>
32 #include <linux/kmemcheck.h>
33 #include <linux/kmemleak.h>
34 #include <linux/fs.h>
35 #include <linux/init.h>
36 #include <linux/kernel.h>
37 #include <linux/kobject.h>
38 #include <linux/net.h>
39 #include <linux/sysrq.h>
40 #include <linux/highuid.h>
41 #include <linux/writeback.h>
42 #include <linux/ratelimit.h>
43 #include <linux/compaction.h>
44 #include <linux/hugetlb.h>
45 #include <linux/initrd.h>
46 #include <linux/key.h>
47 #include <linux/times.h>
48 #include <linux/limits.h>
49 #include <linux/dcache.h>
50 #include <linux/dnotify.h>
51 #include <linux/syscalls.h>
52 #include <linux/vmstat.h>
53 #include <linux/nfs_fs.h>
54 #include <linux/acpi.h>
55 #include <linux/reboot.h>
56 #include <linux/ftrace.h>
57 #include <linux/perf_event.h>
58 #include <linux/kprobes.h>
59 #include <linux/pipe_fs_i.h>
60 #include <linux/oom.h>
61 #include <linux/kmod.h>
62 #include <linux/capability.h>
63 #include <linux/binfmts.h>
64 #include <linux/sched/sysctl.h>
65 #include <linux/kexec.h>
66
67 #include <asm/uaccess.h>
68 #include <asm/processor.h>
69
70 #ifdef CONFIG_X86
71 #include <asm/nmi.h>
72 #include <asm/stacktrace.h>
73 #include <asm/io.h>
74 #endif
75 #ifdef CONFIG_SPARC
76 #include <asm/setup.h>
77 #endif
78 #ifdef CONFIG_BSD_PROCESS_ACCT
79 #include <linux/acct.h>
80 #endif
81 #ifdef CONFIG_RT_MUTEXES
82 #include <linux/rtmutex.h>
83 #endif
84 #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
85 #include <linux/lockdep.h>
86 #endif
87 #ifdef CONFIG_CHR_DEV_SG
88 #include <scsi/sg.h>
89 #endif
90
91 #ifdef CONFIG_LOCKUP_DETECTOR
92 #include <linux/nmi.h>
93 #endif
94
95
96 #if defined(CONFIG_SYSCTL)
97
98 /* External variables not in a header file. */
99 extern int max_threads;
100 extern int suid_dumpable;
101 #ifdef CONFIG_COREDUMP
102 extern int core_uses_pid;
103 extern char core_pattern[];
104 extern unsigned int core_pipe_limit;
105 #endif
106 extern int pid_max;
107 extern int pid_max_min, pid_max_max;
108 extern int percpu_pagelist_fraction;
109 extern int compat_log;
110 extern int latencytop_enabled;
111 extern int sysctl_nr_open_min, sysctl_nr_open_max;
112 #ifndef CONFIG_MMU
113 extern int sysctl_nr_trim_pages;
114 #endif
115
116 /* Constants used for minimum and maximum */
117 #ifdef CONFIG_LOCKUP_DETECTOR
118 static int sixty = 60;
119 #endif
120
121 static int __maybe_unused neg_one = -1;
122
123 static int zero;
124 static int __maybe_unused one = 1;
125 static int __maybe_unused two = 2;
126 static int __maybe_unused four = 4;
127 static unsigned long one_ul = 1;
128 static int one_hundred = 100;
129 #ifdef CONFIG_PRINTK
130 static int ten_thousand = 10000;
131 #endif
132
133 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
134 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
135
136 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
137 static int maxolduid = 65535;
138 static int minolduid;
139 static int min_percpu_pagelist_fract = 8;
140
141 static int ngroups_max = NGROUPS_MAX;
142 static const int cap_last_cap = CAP_LAST_CAP;
143
144 /*this is needed for proc_doulongvec_minmax of sysctl_hung_task_timeout_secs */
145 #ifdef CONFIG_DETECT_HUNG_TASK
146 static unsigned long hung_task_timeout_max = (LONG_MAX/HZ);
147 #endif
148
149 #ifdef CONFIG_INOTIFY_USER
150 #include <linux/inotify.h>
151 #endif
152 #ifdef CONFIG_SPARC
153 #endif
154
155 #ifdef CONFIG_SPARC64
156 extern int sysctl_tsb_ratio;
157 #endif
158
159 #ifdef __hppa__
160 extern int pwrsw_enabled;
161 #endif
162
163 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
164 extern int unaligned_enabled;
165 #endif
166
167 #ifdef CONFIG_IA64
168 extern int unaligned_dump_stack;
169 #endif
170
171 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
172 extern int no_unaligned_warning;
173 #endif
174
175 #ifdef CONFIG_PROC_SYSCTL
176 static int proc_do_cad_pid(struct ctl_table *table, int write,
177 void __user *buffer, size_t *lenp, loff_t *ppos);
178 static int proc_taint(struct ctl_table *table, int write,
179 void __user *buffer, size_t *lenp, loff_t *ppos);
180 #endif
181
182 #ifdef CONFIG_PRINTK
183 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
184 void __user *buffer, size_t *lenp, loff_t *ppos);
185 #endif
186
187 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
188 void __user *buffer, size_t *lenp, loff_t *ppos);
189 #ifdef CONFIG_COREDUMP
190 static int proc_dostring_coredump(struct ctl_table *table, int write,
191 void __user *buffer, size_t *lenp, loff_t *ppos);
192 #endif
193
194 #ifdef CONFIG_MAGIC_SYSRQ
195 /* Note: sysrq code uses it's own private copy */
196 static int __sysrq_enabled = CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE;
197
198 static int sysrq_sysctl_handler(ctl_table *table, int write,
199 void __user *buffer, size_t *lenp,
200 loff_t *ppos)
201 {
202 int error;
203
204 error = proc_dointvec(table, write, buffer, lenp, ppos);
205 if (error)
206 return error;
207
208 if (write)
209 sysrq_toggle_support(__sysrq_enabled);
210
211 return 0;
212 }
213
214 #endif
215
216 static struct ctl_table kern_table[];
217 static struct ctl_table vm_table[];
218 static struct ctl_table fs_table[];
219 static struct ctl_table debug_table[];
220 static struct ctl_table dev_table[];
221 extern struct ctl_table random_table[];
222 #ifdef CONFIG_EPOLL
223 extern struct ctl_table epoll_table[];
224 #endif
225
226 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
227 int sysctl_legacy_va_layout;
228 #endif
229
230 /* The default sysctl tables: */
231
232 static struct ctl_table sysctl_base_table[] = {
233 {
234 .procname = "kernel",
235 .mode = 0555,
236 .child = kern_table,
237 },
238 {
239 .procname = "vm",
240 .mode = 0555,
241 .child = vm_table,
242 },
243 {
244 .procname = "fs",
245 .mode = 0555,
246 .child = fs_table,
247 },
248 {
249 .procname = "debug",
250 .mode = 0555,
251 .child = debug_table,
252 },
253 {
254 .procname = "dev",
255 .mode = 0555,
256 .child = dev_table,
257 },
258 { }
259 };
260
261 #ifdef CONFIG_SCHED_DEBUG
262 static int min_sched_granularity_ns = 100000; /* 100 usecs */
263 static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */
264 static int min_wakeup_granularity_ns; /* 0 usecs */
265 static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */
266 #ifdef CONFIG_SMP
267 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
268 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
269 #endif /* CONFIG_SMP */
270 #endif /* CONFIG_SCHED_DEBUG */
271
272 #ifdef CONFIG_COMPACTION
273 static int min_extfrag_threshold;
274 static int max_extfrag_threshold = 1000;
275 #endif
276
277 static struct ctl_table kern_table[] = {
278 {
279 .procname = "sched_child_runs_first",
280 .data = &sysctl_sched_child_runs_first,
281 .maxlen = sizeof(unsigned int),
282 .mode = 0644,
283 .proc_handler = proc_dointvec,
284 },
285 #ifdef CONFIG_SCHED_DEBUG
286 {
287 .procname = "sched_min_granularity_ns",
288 .data = &sysctl_sched_min_granularity,
289 .maxlen = sizeof(unsigned int),
290 .mode = 0644,
291 .proc_handler = sched_proc_update_handler,
292 .extra1 = &min_sched_granularity_ns,
293 .extra2 = &max_sched_granularity_ns,
294 },
295 {
296 .procname = "sched_latency_ns",
297 .data = &sysctl_sched_latency,
298 .maxlen = sizeof(unsigned int),
299 .mode = 0644,
300 .proc_handler = sched_proc_update_handler,
301 .extra1 = &min_sched_granularity_ns,
302 .extra2 = &max_sched_granularity_ns,
303 },
304 {
305 .procname = "sched_wakeup_granularity_ns",
306 .data = &sysctl_sched_wakeup_granularity,
307 .maxlen = sizeof(unsigned int),
308 .mode = 0644,
309 .proc_handler = sched_proc_update_handler,
310 .extra1 = &min_wakeup_granularity_ns,
311 .extra2 = &max_wakeup_granularity_ns,
312 },
313 #ifdef CONFIG_SMP
314 {
315 .procname = "sched_tunable_scaling",
316 .data = &sysctl_sched_tunable_scaling,
317 .maxlen = sizeof(enum sched_tunable_scaling),
318 .mode = 0644,
319 .proc_handler = sched_proc_update_handler,
320 .extra1 = &min_sched_tunable_scaling,
321 .extra2 = &max_sched_tunable_scaling,
322 },
323 {
324 .procname = "sched_migration_cost_ns",
325 .data = &sysctl_sched_migration_cost,
326 .maxlen = sizeof(unsigned int),
327 .mode = 0644,
328 .proc_handler = proc_dointvec,
329 },
330 {
331 .procname = "sched_nr_migrate",
332 .data = &sysctl_sched_nr_migrate,
333 .maxlen = sizeof(unsigned int),
334 .mode = 0644,
335 .proc_handler = proc_dointvec,
336 },
337 {
338 .procname = "sched_time_avg_ms",
339 .data = &sysctl_sched_time_avg,
340 .maxlen = sizeof(unsigned int),
341 .mode = 0644,
342 .proc_handler = proc_dointvec,
343 },
344 {
345 .procname = "sched_shares_window_ns",
346 .data = &sysctl_sched_shares_window,
347 .maxlen = sizeof(unsigned int),
348 .mode = 0644,
349 .proc_handler = proc_dointvec,
350 },
351 {
352 .procname = "timer_migration",
353 .data = &sysctl_timer_migration,
354 .maxlen = sizeof(unsigned int),
355 .mode = 0644,
356 .proc_handler = proc_dointvec_minmax,
357 .extra1 = &zero,
358 .extra2 = &one,
359 },
360 #endif /* CONFIG_SMP */
361 #ifdef CONFIG_NUMA_BALANCING
362 {
363 .procname = "numa_balancing_scan_delay_ms",
364 .data = &sysctl_numa_balancing_scan_delay,
365 .maxlen = sizeof(unsigned int),
366 .mode = 0644,
367 .proc_handler = proc_dointvec,
368 },
369 {
370 .procname = "numa_balancing_scan_period_min_ms",
371 .data = &sysctl_numa_balancing_scan_period_min,
372 .maxlen = sizeof(unsigned int),
373 .mode = 0644,
374 .proc_handler = proc_dointvec,
375 },
376 {
377 .procname = "numa_balancing_scan_period_max_ms",
378 .data = &sysctl_numa_balancing_scan_period_max,
379 .maxlen = sizeof(unsigned int),
380 .mode = 0644,
381 .proc_handler = proc_dointvec,
382 },
383 {
384 .procname = "numa_balancing_scan_size_mb",
385 .data = &sysctl_numa_balancing_scan_size,
386 .maxlen = sizeof(unsigned int),
387 .mode = 0644,
388 .proc_handler = proc_dointvec,
389 },
390 {
391 .procname = "numa_balancing",
392 .data = NULL, /* filled in by handler */
393 .maxlen = sizeof(unsigned int),
394 .mode = 0644,
395 .proc_handler = sysctl_numa_balancing,
396 .extra1 = &zero,
397 .extra2 = &one,
398 },
399 #endif /* CONFIG_NUMA_BALANCING */
400 #endif /* CONFIG_SCHED_DEBUG */
401 {
402 .procname = "sched_rt_period_us",
403 .data = &sysctl_sched_rt_period,
404 .maxlen = sizeof(unsigned int),
405 .mode = 0644,
406 .proc_handler = sched_rt_handler,
407 },
408 {
409 .procname = "sched_rt_runtime_us",
410 .data = &sysctl_sched_rt_runtime,
411 .maxlen = sizeof(int),
412 .mode = 0644,
413 .proc_handler = sched_rt_handler,
414 },
415 {
416 .procname = "sched_rr_timeslice_ms",
417 .data = &sched_rr_timeslice,
418 .maxlen = sizeof(int),
419 .mode = 0644,
420 .proc_handler = sched_rr_handler,
421 },
422 #ifdef CONFIG_SCHED_AUTOGROUP
423 {
424 .procname = "sched_autogroup_enabled",
425 .data = &sysctl_sched_autogroup_enabled,
426 .maxlen = sizeof(unsigned int),
427 .mode = 0644,
428 .proc_handler = proc_dointvec_minmax,
429 .extra1 = &zero,
430 .extra2 = &one,
431 },
432 #endif
433 #ifdef CONFIG_CFS_BANDWIDTH
434 {
435 .procname = "sched_cfs_bandwidth_slice_us",
436 .data = &sysctl_sched_cfs_bandwidth_slice,
437 .maxlen = sizeof(unsigned int),
438 .mode = 0644,
439 .proc_handler = proc_dointvec_minmax,
440 .extra1 = &one,
441 },
442 #endif
443 #ifdef CONFIG_PROVE_LOCKING
444 {
445 .procname = "prove_locking",
446 .data = &prove_locking,
447 .maxlen = sizeof(int),
448 .mode = 0644,
449 .proc_handler = proc_dointvec,
450 },
451 #endif
452 #ifdef CONFIG_LOCK_STAT
453 {
454 .procname = "lock_stat",
455 .data = &lock_stat,
456 .maxlen = sizeof(int),
457 .mode = 0644,
458 .proc_handler = proc_dointvec,
459 },
460 #endif
461 {
462 .procname = "panic",
463 .data = &panic_timeout,
464 .maxlen = sizeof(int),
465 .mode = 0644,
466 .proc_handler = proc_dointvec,
467 },
468 #ifdef CONFIG_COREDUMP
469 {
470 .procname = "core_uses_pid",
471 .data = &core_uses_pid,
472 .maxlen = sizeof(int),
473 .mode = 0644,
474 .proc_handler = proc_dointvec,
475 },
476 {
477 .procname = "core_pattern",
478 .data = core_pattern,
479 .maxlen = CORENAME_MAX_SIZE,
480 .mode = 0644,
481 .proc_handler = proc_dostring_coredump,
482 },
483 {
484 .procname = "core_pipe_limit",
485 .data = &core_pipe_limit,
486 .maxlen = sizeof(unsigned int),
487 .mode = 0644,
488 .proc_handler = proc_dointvec,
489 },
490 #endif
491 #ifdef CONFIG_PROC_SYSCTL
492 {
493 .procname = "tainted",
494 .maxlen = sizeof(long),
495 .mode = 0644,
496 .proc_handler = proc_taint,
497 },
498 #endif
499 #ifdef CONFIG_LATENCYTOP
500 {
501 .procname = "latencytop",
502 .data = &latencytop_enabled,
503 .maxlen = sizeof(int),
504 .mode = 0644,
505 .proc_handler = proc_dointvec,
506 },
507 #endif
508 #ifdef CONFIG_BLK_DEV_INITRD
509 {
510 .procname = "real-root-dev",
511 .data = &real_root_dev,
512 .maxlen = sizeof(int),
513 .mode = 0644,
514 .proc_handler = proc_dointvec,
515 },
516 #endif
517 {
518 .procname = "print-fatal-signals",
519 .data = &print_fatal_signals,
520 .maxlen = sizeof(int),
521 .mode = 0644,
522 .proc_handler = proc_dointvec,
523 },
524 #ifdef CONFIG_SPARC
525 {
526 .procname = "reboot-cmd",
527 .data = reboot_command,
528 .maxlen = 256,
529 .mode = 0644,
530 .proc_handler = proc_dostring,
531 },
532 {
533 .procname = "stop-a",
534 .data = &stop_a_enabled,
535 .maxlen = sizeof (int),
536 .mode = 0644,
537 .proc_handler = proc_dointvec,
538 },
539 {
540 .procname = "scons-poweroff",
541 .data = &scons_pwroff,
542 .maxlen = sizeof (int),
543 .mode = 0644,
544 .proc_handler = proc_dointvec,
545 },
546 #endif
547 #ifdef CONFIG_SPARC64
548 {
549 .procname = "tsb-ratio",
550 .data = &sysctl_tsb_ratio,
551 .maxlen = sizeof (int),
552 .mode = 0644,
553 .proc_handler = proc_dointvec,
554 },
555 #endif
556 #ifdef __hppa__
557 {
558 .procname = "soft-power",
559 .data = &pwrsw_enabled,
560 .maxlen = sizeof (int),
561 .mode = 0644,
562 .proc_handler = proc_dointvec,
563 },
564 #endif
565 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
566 {
567 .procname = "unaligned-trap",
568 .data = &unaligned_enabled,
569 .maxlen = sizeof (int),
570 .mode = 0644,
571 .proc_handler = proc_dointvec,
572 },
573 #endif
574 {
575 .procname = "ctrl-alt-del",
576 .data = &C_A_D,
577 .maxlen = sizeof(int),
578 .mode = 0644,
579 .proc_handler = proc_dointvec,
580 },
581 #ifdef CONFIG_FUNCTION_TRACER
582 {
583 .procname = "ftrace_enabled",
584 .data = &ftrace_enabled,
585 .maxlen = sizeof(int),
586 .mode = 0644,
587 .proc_handler = ftrace_enable_sysctl,
588 },
589 #endif
590 #ifdef CONFIG_STACK_TRACER
591 {
592 .procname = "stack_tracer_enabled",
593 .data = &stack_tracer_enabled,
594 .maxlen = sizeof(int),
595 .mode = 0644,
596 .proc_handler = stack_trace_sysctl,
597 },
598 #endif
599 #ifdef CONFIG_TRACING
600 {
601 .procname = "ftrace_dump_on_oops",
602 .data = &ftrace_dump_on_oops,
603 .maxlen = sizeof(int),
604 .mode = 0644,
605 .proc_handler = proc_dointvec,
606 },
607 {
608 .procname = "traceoff_on_warning",
609 .data = &__disable_trace_on_warning,
610 .maxlen = sizeof(__disable_trace_on_warning),
611 .mode = 0644,
612 .proc_handler = proc_dointvec,
613 },
614 #endif
615 #ifdef CONFIG_KEXEC
616 {
617 .procname = "kexec_load_disabled",
618 .data = &kexec_load_disabled,
619 .maxlen = sizeof(int),
620 .mode = 0644,
621 /* only handle a transition from default "0" to "1" */
622 .proc_handler = proc_dointvec_minmax,
623 .extra1 = &one,
624 .extra2 = &one,
625 },
626 #endif
627 #ifdef CONFIG_MODULES
628 {
629 .procname = "modprobe",
630 .data = &modprobe_path,
631 .maxlen = KMOD_PATH_LEN,
632 .mode = 0644,
633 .proc_handler = proc_dostring,
634 },
635 {
636 .procname = "modules_disabled",
637 .data = &modules_disabled,
638 .maxlen = sizeof(int),
639 .mode = 0644,
640 /* only handle a transition from default "0" to "1" */
641 .proc_handler = proc_dointvec_minmax,
642 .extra1 = &one,
643 .extra2 = &one,
644 },
645 #endif
646 #ifdef CONFIG_UEVENT_HELPER
647 {
648 .procname = "hotplug",
649 .data = &uevent_helper,
650 .maxlen = UEVENT_HELPER_PATH_LEN,
651 .mode = 0644,
652 .proc_handler = proc_dostring,
653 },
654 #endif
655 #ifdef CONFIG_CHR_DEV_SG
656 {
657 .procname = "sg-big-buff",
658 .data = &sg_big_buff,
659 .maxlen = sizeof (int),
660 .mode = 0444,
661 .proc_handler = proc_dointvec,
662 },
663 #endif
664 #ifdef CONFIG_BSD_PROCESS_ACCT
665 {
666 .procname = "acct",
667 .data = &acct_parm,
668 .maxlen = 3*sizeof(int),
669 .mode = 0644,
670 .proc_handler = proc_dointvec,
671 },
672 #endif
673 #ifdef CONFIG_MAGIC_SYSRQ
674 {
675 .procname = "sysrq",
676 .data = &__sysrq_enabled,
677 .maxlen = sizeof (int),
678 .mode = 0644,
679 .proc_handler = sysrq_sysctl_handler,
680 },
681 #endif
682 #ifdef CONFIG_PROC_SYSCTL
683 {
684 .procname = "cad_pid",
685 .data = NULL,
686 .maxlen = sizeof (int),
687 .mode = 0600,
688 .proc_handler = proc_do_cad_pid,
689 },
690 #endif
691 {
692 .procname = "threads-max",
693 .data = &max_threads,
694 .maxlen = sizeof(int),
695 .mode = 0644,
696 .proc_handler = proc_dointvec,
697 },
698 {
699 .procname = "random",
700 .mode = 0555,
701 .child = random_table,
702 },
703 {
704 .procname = "usermodehelper",
705 .mode = 0555,
706 .child = usermodehelper_table,
707 },
708 {
709 .procname = "overflowuid",
710 .data = &overflowuid,
711 .maxlen = sizeof(int),
712 .mode = 0644,
713 .proc_handler = proc_dointvec_minmax,
714 .extra1 = &minolduid,
715 .extra2 = &maxolduid,
716 },
717 {
718 .procname = "overflowgid",
719 .data = &overflowgid,
720 .maxlen = sizeof(int),
721 .mode = 0644,
722 .proc_handler = proc_dointvec_minmax,
723 .extra1 = &minolduid,
724 .extra2 = &maxolduid,
725 },
726 #ifdef CONFIG_S390
727 #ifdef CONFIG_MATHEMU
728 {
729 .procname = "ieee_emulation_warnings",
730 .data = &sysctl_ieee_emulation_warnings,
731 .maxlen = sizeof(int),
732 .mode = 0644,
733 .proc_handler = proc_dointvec,
734 },
735 #endif
736 {
737 .procname = "userprocess_debug",
738 .data = &show_unhandled_signals,
739 .maxlen = sizeof(int),
740 .mode = 0644,
741 .proc_handler = proc_dointvec,
742 },
743 #endif
744 {
745 .procname = "pid_max",
746 .data = &pid_max,
747 .maxlen = sizeof (int),
748 .mode = 0644,
749 .proc_handler = proc_dointvec_minmax,
750 .extra1 = &pid_max_min,
751 .extra2 = &pid_max_max,
752 },
753 {
754 .procname = "panic_on_oops",
755 .data = &panic_on_oops,
756 .maxlen = sizeof(int),
757 .mode = 0644,
758 .proc_handler = proc_dointvec,
759 },
760 #if defined CONFIG_PRINTK
761 {
762 .procname = "printk",
763 .data = &console_loglevel,
764 .maxlen = 4*sizeof(int),
765 .mode = 0644,
766 .proc_handler = proc_dointvec,
767 },
768 {
769 .procname = "printk_ratelimit",
770 .data = &printk_ratelimit_state.interval,
771 .maxlen = sizeof(int),
772 .mode = 0644,
773 .proc_handler = proc_dointvec_jiffies,
774 },
775 {
776 .procname = "printk_ratelimit_burst",
777 .data = &printk_ratelimit_state.burst,
778 .maxlen = sizeof(int),
779 .mode = 0644,
780 .proc_handler = proc_dointvec,
781 },
782 {
783 .procname = "printk_delay",
784 .data = &printk_delay_msec,
785 .maxlen = sizeof(int),
786 .mode = 0644,
787 .proc_handler = proc_dointvec_minmax,
788 .extra1 = &zero,
789 .extra2 = &ten_thousand,
790 },
791 {
792 .procname = "dmesg_restrict",
793 .data = &dmesg_restrict,
794 .maxlen = sizeof(int),
795 .mode = 0644,
796 .proc_handler = proc_dointvec_minmax_sysadmin,
797 .extra1 = &zero,
798 .extra2 = &one,
799 },
800 {
801 .procname = "kptr_restrict",
802 .data = &kptr_restrict,
803 .maxlen = sizeof(int),
804 .mode = 0644,
805 .proc_handler = proc_dointvec_minmax_sysadmin,
806 .extra1 = &zero,
807 .extra2 = &two,
808 },
809 #endif
810 {
811 .procname = "ngroups_max",
812 .data = &ngroups_max,
813 .maxlen = sizeof (int),
814 .mode = 0444,
815 .proc_handler = proc_dointvec,
816 },
817 {
818 .procname = "cap_last_cap",
819 .data = (void *)&cap_last_cap,
820 .maxlen = sizeof(int),
821 .mode = 0444,
822 .proc_handler = proc_dointvec,
823 },
824 #if defined(CONFIG_LOCKUP_DETECTOR)
825 {
826 .procname = "watchdog",
827 .data = &watchdog_user_enabled,
828 .maxlen = sizeof (int),
829 .mode = 0644,
830 .proc_handler = proc_dowatchdog,
831 .extra1 = &zero,
832 .extra2 = &one,
833 },
834 {
835 .procname = "watchdog_thresh",
836 .data = &watchdog_thresh,
837 .maxlen = sizeof(int),
838 .mode = 0644,
839 .proc_handler = proc_dowatchdog,
840 .extra1 = &zero,
841 .extra2 = &sixty,
842 },
843 {
844 .procname = "softlockup_panic",
845 .data = &softlockup_panic,
846 .maxlen = sizeof(int),
847 .mode = 0644,
848 .proc_handler = proc_dointvec_minmax,
849 .extra1 = &zero,
850 .extra2 = &one,
851 },
852 {
853 .procname = "nmi_watchdog",
854 .data = &watchdog_user_enabled,
855 .maxlen = sizeof (int),
856 .mode = 0644,
857 .proc_handler = proc_dowatchdog,
858 .extra1 = &zero,
859 .extra2 = &one,
860 },
861 #endif
862 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
863 {
864 .procname = "unknown_nmi_panic",
865 .data = &unknown_nmi_panic,
866 .maxlen = sizeof (int),
867 .mode = 0644,
868 .proc_handler = proc_dointvec,
869 },
870 #endif
871 #if defined(CONFIG_X86)
872 {
873 .procname = "panic_on_unrecovered_nmi",
874 .data = &panic_on_unrecovered_nmi,
875 .maxlen = sizeof(int),
876 .mode = 0644,
877 .proc_handler = proc_dointvec,
878 },
879 {
880 .procname = "panic_on_io_nmi",
881 .data = &panic_on_io_nmi,
882 .maxlen = sizeof(int),
883 .mode = 0644,
884 .proc_handler = proc_dointvec,
885 },
886 #ifdef CONFIG_DEBUG_STACKOVERFLOW
887 {
888 .procname = "panic_on_stackoverflow",
889 .data = &sysctl_panic_on_stackoverflow,
890 .maxlen = sizeof(int),
891 .mode = 0644,
892 .proc_handler = proc_dointvec,
893 },
894 #endif
895 {
896 .procname = "bootloader_type",
897 .data = &bootloader_type,
898 .maxlen = sizeof (int),
899 .mode = 0444,
900 .proc_handler = proc_dointvec,
901 },
902 {
903 .procname = "bootloader_version",
904 .data = &bootloader_version,
905 .maxlen = sizeof (int),
906 .mode = 0444,
907 .proc_handler = proc_dointvec,
908 },
909 {
910 .procname = "kstack_depth_to_print",
911 .data = &kstack_depth_to_print,
912 .maxlen = sizeof(int),
913 .mode = 0644,
914 .proc_handler = proc_dointvec,
915 },
916 {
917 .procname = "io_delay_type",
918 .data = &io_delay_type,
919 .maxlen = sizeof(int),
920 .mode = 0644,
921 .proc_handler = proc_dointvec,
922 },
923 #endif
924 #if defined(CONFIG_MMU)
925 {
926 .procname = "randomize_va_space",
927 .data = &randomize_va_space,
928 .maxlen = sizeof(int),
929 .mode = 0644,
930 .proc_handler = proc_dointvec,
931 },
932 #endif
933 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
934 {
935 .procname = "spin_retry",
936 .data = &spin_retry,
937 .maxlen = sizeof (int),
938 .mode = 0644,
939 .proc_handler = proc_dointvec,
940 },
941 #endif
942 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
943 {
944 .procname = "acpi_video_flags",
945 .data = &acpi_realmode_flags,
946 .maxlen = sizeof (unsigned long),
947 .mode = 0644,
948 .proc_handler = proc_doulongvec_minmax,
949 },
950 #endif
951 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
952 {
953 .procname = "ignore-unaligned-usertrap",
954 .data = &no_unaligned_warning,
955 .maxlen = sizeof (int),
956 .mode = 0644,
957 .proc_handler = proc_dointvec,
958 },
959 #endif
960 #ifdef CONFIG_IA64
961 {
962 .procname = "unaligned-dump-stack",
963 .data = &unaligned_dump_stack,
964 .maxlen = sizeof (int),
965 .mode = 0644,
966 .proc_handler = proc_dointvec,
967 },
968 #endif
969 #ifdef CONFIG_DETECT_HUNG_TASK
970 {
971 .procname = "hung_task_panic",
972 .data = &sysctl_hung_task_panic,
973 .maxlen = sizeof(int),
974 .mode = 0644,
975 .proc_handler = proc_dointvec_minmax,
976 .extra1 = &zero,
977 .extra2 = &one,
978 },
979 {
980 .procname = "hung_task_check_count",
981 .data = &sysctl_hung_task_check_count,
982 .maxlen = sizeof(int),
983 .mode = 0644,
984 .proc_handler = proc_dointvec_minmax,
985 .extra1 = &zero,
986 },
987 {
988 .procname = "hung_task_timeout_secs",
989 .data = &sysctl_hung_task_timeout_secs,
990 .maxlen = sizeof(unsigned long),
991 .mode = 0644,
992 .proc_handler = proc_dohung_task_timeout_secs,
993 .extra2 = &hung_task_timeout_max,
994 },
995 {
996 .procname = "hung_task_warnings",
997 .data = &sysctl_hung_task_warnings,
998 .maxlen = sizeof(int),
999 .mode = 0644,
1000 .proc_handler = proc_dointvec_minmax,
1001 .extra1 = &neg_one,
1002 },
1003 #endif
1004 #ifdef CONFIG_COMPAT
1005 {
1006 .procname = "compat-log",
1007 .data = &compat_log,
1008 .maxlen = sizeof (int),
1009 .mode = 0644,
1010 .proc_handler = proc_dointvec,
1011 },
1012 #endif
1013 #ifdef CONFIG_RT_MUTEXES
1014 {
1015 .procname = "max_lock_depth",
1016 .data = &max_lock_depth,
1017 .maxlen = sizeof(int),
1018 .mode = 0644,
1019 .proc_handler = proc_dointvec,
1020 },
1021 #endif
1022 {
1023 .procname = "poweroff_cmd",
1024 .data = &poweroff_cmd,
1025 .maxlen = POWEROFF_CMD_PATH_LEN,
1026 .mode = 0644,
1027 .proc_handler = proc_dostring,
1028 },
1029 #ifdef CONFIG_KEYS
1030 {
1031 .procname = "keys",
1032 .mode = 0555,
1033 .child = key_sysctls,
1034 },
1035 #endif
1036 #ifdef CONFIG_RCU_TORTURE_TEST
1037 {
1038 .procname = "rcutorture_runnable",
1039 .data = &rcutorture_runnable,
1040 .maxlen = sizeof(int),
1041 .mode = 0644,
1042 .proc_handler = proc_dointvec,
1043 },
1044 #endif
1045 #ifdef CONFIG_PERF_EVENTS
1046 /*
1047 * User-space scripts rely on the existence of this file
1048 * as a feature check for perf_events being enabled.
1049 *
1050 * So it's an ABI, do not remove!
1051 */
1052 {
1053 .procname = "perf_event_paranoid",
1054 .data = &sysctl_perf_event_paranoid,
1055 .maxlen = sizeof(sysctl_perf_event_paranoid),
1056 .mode = 0644,
1057 .proc_handler = proc_dointvec,
1058 },
1059 {
1060 .procname = "perf_event_mlock_kb",
1061 .data = &sysctl_perf_event_mlock,
1062 .maxlen = sizeof(sysctl_perf_event_mlock),
1063 .mode = 0644,
1064 .proc_handler = proc_dointvec,
1065 },
1066 {
1067 .procname = "perf_event_max_sample_rate",
1068 .data = &sysctl_perf_event_sample_rate,
1069 .maxlen = sizeof(sysctl_perf_event_sample_rate),
1070 .mode = 0644,
1071 .proc_handler = perf_proc_update_handler,
1072 .extra1 = &one,
1073 },
1074 {
1075 .procname = "perf_cpu_time_max_percent",
1076 .data = &sysctl_perf_cpu_time_max_percent,
1077 .maxlen = sizeof(sysctl_perf_cpu_time_max_percent),
1078 .mode = 0644,
1079 .proc_handler = perf_cpu_time_max_percent_handler,
1080 .extra1 = &zero,
1081 .extra2 = &one_hundred,
1082 },
1083 #endif
1084 #ifdef CONFIG_KMEMCHECK
1085 {
1086 .procname = "kmemcheck",
1087 .data = &kmemcheck_enabled,
1088 .maxlen = sizeof(int),
1089 .mode = 0644,
1090 .proc_handler = proc_dointvec,
1091 },
1092 #endif
1093 { }
1094 };
1095
1096 static struct ctl_table vm_table[] = {
1097 {
1098 .procname = "overcommit_memory",
1099 .data = &sysctl_overcommit_memory,
1100 .maxlen = sizeof(sysctl_overcommit_memory),
1101 .mode = 0644,
1102 .proc_handler = proc_dointvec_minmax,
1103 .extra1 = &zero,
1104 .extra2 = &two,
1105 },
1106 {
1107 .procname = "panic_on_oom",
1108 .data = &sysctl_panic_on_oom,
1109 .maxlen = sizeof(sysctl_panic_on_oom),
1110 .mode = 0644,
1111 .proc_handler = proc_dointvec_minmax,
1112 .extra1 = &zero,
1113 .extra2 = &two,
1114 },
1115 {
1116 .procname = "oom_kill_allocating_task",
1117 .data = &sysctl_oom_kill_allocating_task,
1118 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
1119 .mode = 0644,
1120 .proc_handler = proc_dointvec,
1121 },
1122 {
1123 .procname = "oom_dump_tasks",
1124 .data = &sysctl_oom_dump_tasks,
1125 .maxlen = sizeof(sysctl_oom_dump_tasks),
1126 .mode = 0644,
1127 .proc_handler = proc_dointvec,
1128 },
1129 {
1130 .procname = "overcommit_ratio",
1131 .data = &sysctl_overcommit_ratio,
1132 .maxlen = sizeof(sysctl_overcommit_ratio),
1133 .mode = 0644,
1134 .proc_handler = overcommit_ratio_handler,
1135 },
1136 {
1137 .procname = "overcommit_kbytes",
1138 .data = &sysctl_overcommit_kbytes,
1139 .maxlen = sizeof(sysctl_overcommit_kbytes),
1140 .mode = 0644,
1141 .proc_handler = overcommit_kbytes_handler,
1142 },
1143 {
1144 .procname = "page-cluster",
1145 .data = &page_cluster,
1146 .maxlen = sizeof(int),
1147 .mode = 0644,
1148 .proc_handler = proc_dointvec_minmax,
1149 .extra1 = &zero,
1150 },
1151 {
1152 .procname = "dirty_background_ratio",
1153 .data = &dirty_background_ratio,
1154 .maxlen = sizeof(dirty_background_ratio),
1155 .mode = 0644,
1156 .proc_handler = dirty_background_ratio_handler,
1157 .extra1 = &zero,
1158 .extra2 = &one_hundred,
1159 },
1160 {
1161 .procname = "dirty_background_bytes",
1162 .data = &dirty_background_bytes,
1163 .maxlen = sizeof(dirty_background_bytes),
1164 .mode = 0644,
1165 .proc_handler = dirty_background_bytes_handler,
1166 .extra1 = &one_ul,
1167 },
1168 {
1169 .procname = "dirty_ratio",
1170 .data = &vm_dirty_ratio,
1171 .maxlen = sizeof(vm_dirty_ratio),
1172 .mode = 0644,
1173 .proc_handler = dirty_ratio_handler,
1174 .extra1 = &zero,
1175 .extra2 = &one_hundred,
1176 },
1177 {
1178 .procname = "dirty_bytes",
1179 .data = &vm_dirty_bytes,
1180 .maxlen = sizeof(vm_dirty_bytes),
1181 .mode = 0644,
1182 .proc_handler = dirty_bytes_handler,
1183 .extra1 = &dirty_bytes_min,
1184 },
1185 {
1186 .procname = "dirty_writeback_centisecs",
1187 .data = &dirty_writeback_interval,
1188 .maxlen = sizeof(dirty_writeback_interval),
1189 .mode = 0644,
1190 .proc_handler = dirty_writeback_centisecs_handler,
1191 },
1192 {
1193 .procname = "dirty_expire_centisecs",
1194 .data = &dirty_expire_interval,
1195 .maxlen = sizeof(dirty_expire_interval),
1196 .mode = 0644,
1197 .proc_handler = proc_dointvec_minmax,
1198 .extra1 = &zero,
1199 },
1200 {
1201 .procname = "nr_pdflush_threads",
1202 .mode = 0444 /* read-only */,
1203 .proc_handler = pdflush_proc_obsolete,
1204 },
1205 {
1206 .procname = "swappiness",
1207 .data = &vm_swappiness,
1208 .maxlen = sizeof(vm_swappiness),
1209 .mode = 0644,
1210 .proc_handler = proc_dointvec_minmax,
1211 .extra1 = &zero,
1212 .extra2 = &one_hundred,
1213 },
1214 #ifdef CONFIG_HUGETLB_PAGE
1215 {
1216 .procname = "nr_hugepages",
1217 .data = NULL,
1218 .maxlen = sizeof(unsigned long),
1219 .mode = 0644,
1220 .proc_handler = hugetlb_sysctl_handler,
1221 .extra1 = (void *)&hugetlb_zero,
1222 .extra2 = (void *)&hugetlb_infinity,
1223 },
1224 #ifdef CONFIG_NUMA
1225 {
1226 .procname = "nr_hugepages_mempolicy",
1227 .data = NULL,
1228 .maxlen = sizeof(unsigned long),
1229 .mode = 0644,
1230 .proc_handler = &hugetlb_mempolicy_sysctl_handler,
1231 .extra1 = (void *)&hugetlb_zero,
1232 .extra2 = (void *)&hugetlb_infinity,
1233 },
1234 #endif
1235 {
1236 .procname = "hugetlb_shm_group",
1237 .data = &sysctl_hugetlb_shm_group,
1238 .maxlen = sizeof(gid_t),
1239 .mode = 0644,
1240 .proc_handler = proc_dointvec,
1241 },
1242 {
1243 .procname = "hugepages_treat_as_movable",
1244 .data = &hugepages_treat_as_movable,
1245 .maxlen = sizeof(int),
1246 .mode = 0644,
1247 .proc_handler = proc_dointvec,
1248 },
1249 {
1250 .procname = "nr_overcommit_hugepages",
1251 .data = NULL,
1252 .maxlen = sizeof(unsigned long),
1253 .mode = 0644,
1254 .proc_handler = hugetlb_overcommit_handler,
1255 .extra1 = (void *)&hugetlb_zero,
1256 .extra2 = (void *)&hugetlb_infinity,
1257 },
1258 #endif
1259 {
1260 .procname = "lowmem_reserve_ratio",
1261 .data = &sysctl_lowmem_reserve_ratio,
1262 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1263 .mode = 0644,
1264 .proc_handler = lowmem_reserve_ratio_sysctl_handler,
1265 },
1266 {
1267 .procname = "drop_caches",
1268 .data = &sysctl_drop_caches,
1269 .maxlen = sizeof(int),
1270 .mode = 0644,
1271 .proc_handler = drop_caches_sysctl_handler,
1272 .extra1 = &one,
1273 .extra2 = &four,
1274 },
1275 #ifdef CONFIG_COMPACTION
1276 {
1277 .procname = "compact_memory",
1278 .data = &sysctl_compact_memory,
1279 .maxlen = sizeof(int),
1280 .mode = 0200,
1281 .proc_handler = sysctl_compaction_handler,
1282 },
1283 {
1284 .procname = "extfrag_threshold",
1285 .data = &sysctl_extfrag_threshold,
1286 .maxlen = sizeof(int),
1287 .mode = 0644,
1288 .proc_handler = sysctl_extfrag_handler,
1289 .extra1 = &min_extfrag_threshold,
1290 .extra2 = &max_extfrag_threshold,
1291 },
1292
1293 #endif /* CONFIG_COMPACTION */
1294 {
1295 .procname = "min_free_kbytes",
1296 .data = &min_free_kbytes,
1297 .maxlen = sizeof(min_free_kbytes),
1298 .mode = 0644,
1299 .proc_handler = min_free_kbytes_sysctl_handler,
1300 .extra1 = &zero,
1301 },
1302 {
1303 .procname = "percpu_pagelist_fraction",
1304 .data = &percpu_pagelist_fraction,
1305 .maxlen = sizeof(percpu_pagelist_fraction),
1306 .mode = 0644,
1307 .proc_handler = percpu_pagelist_fraction_sysctl_handler,
1308 .extra1 = &min_percpu_pagelist_fract,
1309 },
1310 #ifdef CONFIG_MMU
1311 {
1312 .procname = "max_map_count",
1313 .data = &sysctl_max_map_count,
1314 .maxlen = sizeof(sysctl_max_map_count),
1315 .mode = 0644,
1316 .proc_handler = proc_dointvec_minmax,
1317 .extra1 = &zero,
1318 },
1319 #else
1320 {
1321 .procname = "nr_trim_pages",
1322 .data = &sysctl_nr_trim_pages,
1323 .maxlen = sizeof(sysctl_nr_trim_pages),
1324 .mode = 0644,
1325 .proc_handler = proc_dointvec_minmax,
1326 .extra1 = &zero,
1327 },
1328 #endif
1329 {
1330 .procname = "laptop_mode",
1331 .data = &laptop_mode,
1332 .maxlen = sizeof(laptop_mode),
1333 .mode = 0644,
1334 .proc_handler = proc_dointvec_jiffies,
1335 },
1336 {
1337 .procname = "block_dump",
1338 .data = &block_dump,
1339 .maxlen = sizeof(block_dump),
1340 .mode = 0644,
1341 .proc_handler = proc_dointvec,
1342 .extra1 = &zero,
1343 },
1344 {
1345 .procname = "vfs_cache_pressure",
1346 .data = &sysctl_vfs_cache_pressure,
1347 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1348 .mode = 0644,
1349 .proc_handler = proc_dointvec,
1350 .extra1 = &zero,
1351 },
1352 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1353 {
1354 .procname = "legacy_va_layout",
1355 .data = &sysctl_legacy_va_layout,
1356 .maxlen = sizeof(sysctl_legacy_va_layout),
1357 .mode = 0644,
1358 .proc_handler = proc_dointvec,
1359 .extra1 = &zero,
1360 },
1361 #endif
1362 #ifdef CONFIG_NUMA
1363 {
1364 .procname = "zone_reclaim_mode",
1365 .data = &zone_reclaim_mode,
1366 .maxlen = sizeof(zone_reclaim_mode),
1367 .mode = 0644,
1368 .proc_handler = proc_dointvec,
1369 .extra1 = &zero,
1370 },
1371 {
1372 .procname = "min_unmapped_ratio",
1373 .data = &sysctl_min_unmapped_ratio,
1374 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1375 .mode = 0644,
1376 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler,
1377 .extra1 = &zero,
1378 .extra2 = &one_hundred,
1379 },
1380 {
1381 .procname = "min_slab_ratio",
1382 .data = &sysctl_min_slab_ratio,
1383 .maxlen = sizeof(sysctl_min_slab_ratio),
1384 .mode = 0644,
1385 .proc_handler = sysctl_min_slab_ratio_sysctl_handler,
1386 .extra1 = &zero,
1387 .extra2 = &one_hundred,
1388 },
1389 #endif
1390 #ifdef CONFIG_SMP
1391 {
1392 .procname = "stat_interval",
1393 .data = &sysctl_stat_interval,
1394 .maxlen = sizeof(sysctl_stat_interval),
1395 .mode = 0644,
1396 .proc_handler = proc_dointvec_jiffies,
1397 },
1398 #endif
1399 #ifdef CONFIG_MMU
1400 {
1401 .procname = "mmap_min_addr",
1402 .data = &dac_mmap_min_addr,
1403 .maxlen = sizeof(unsigned long),
1404 .mode = 0644,
1405 .proc_handler = mmap_min_addr_handler,
1406 },
1407 #endif
1408 #ifdef CONFIG_NUMA
1409 {
1410 .procname = "numa_zonelist_order",
1411 .data = &numa_zonelist_order,
1412 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1413 .mode = 0644,
1414 .proc_handler = numa_zonelist_order_handler,
1415 },
1416 #endif
1417 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1418 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1419 {
1420 .procname = "vdso_enabled",
1421 #ifdef CONFIG_X86_32
1422 .data = &vdso32_enabled,
1423 .maxlen = sizeof(vdso32_enabled),
1424 #else
1425 .data = &vdso_enabled,
1426 .maxlen = sizeof(vdso_enabled),
1427 #endif
1428 .mode = 0644,
1429 .proc_handler = proc_dointvec,
1430 .extra1 = &zero,
1431 },
1432 #endif
1433 #ifdef CONFIG_HIGHMEM
1434 {
1435 .procname = "highmem_is_dirtyable",
1436 .data = &vm_highmem_is_dirtyable,
1437 .maxlen = sizeof(vm_highmem_is_dirtyable),
1438 .mode = 0644,
1439 .proc_handler = proc_dointvec_minmax,
1440 .extra1 = &zero,
1441 .extra2 = &one,
1442 },
1443 #endif
1444 {
1445 .procname = "scan_unevictable_pages",
1446 .data = &scan_unevictable_pages,
1447 .maxlen = sizeof(scan_unevictable_pages),
1448 .mode = 0644,
1449 .proc_handler = scan_unevictable_handler,
1450 },
1451 #ifdef CONFIG_MEMORY_FAILURE
1452 {
1453 .procname = "memory_failure_early_kill",
1454 .data = &sysctl_memory_failure_early_kill,
1455 .maxlen = sizeof(sysctl_memory_failure_early_kill),
1456 .mode = 0644,
1457 .proc_handler = proc_dointvec_minmax,
1458 .extra1 = &zero,
1459 .extra2 = &one,
1460 },
1461 {
1462 .procname = "memory_failure_recovery",
1463 .data = &sysctl_memory_failure_recovery,
1464 .maxlen = sizeof(sysctl_memory_failure_recovery),
1465 .mode = 0644,
1466 .proc_handler = proc_dointvec_minmax,
1467 .extra1 = &zero,
1468 .extra2 = &one,
1469 },
1470 #endif
1471 {
1472 .procname = "user_reserve_kbytes",
1473 .data = &sysctl_user_reserve_kbytes,
1474 .maxlen = sizeof(sysctl_user_reserve_kbytes),
1475 .mode = 0644,
1476 .proc_handler = proc_doulongvec_minmax,
1477 },
1478 {
1479 .procname = "admin_reserve_kbytes",
1480 .data = &sysctl_admin_reserve_kbytes,
1481 .maxlen = sizeof(sysctl_admin_reserve_kbytes),
1482 .mode = 0644,
1483 .proc_handler = proc_doulongvec_minmax,
1484 },
1485 { }
1486 };
1487
1488 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1489 static struct ctl_table binfmt_misc_table[] = {
1490 { }
1491 };
1492 #endif
1493
1494 static struct ctl_table fs_table[] = {
1495 {
1496 .procname = "inode-nr",
1497 .data = &inodes_stat,
1498 .maxlen = 2*sizeof(long),
1499 .mode = 0444,
1500 .proc_handler = proc_nr_inodes,
1501 },
1502 {
1503 .procname = "inode-state",
1504 .data = &inodes_stat,
1505 .maxlen = 7*sizeof(long),
1506 .mode = 0444,
1507 .proc_handler = proc_nr_inodes,
1508 },
1509 {
1510 .procname = "file-nr",
1511 .data = &files_stat,
1512 .maxlen = sizeof(files_stat),
1513 .mode = 0444,
1514 .proc_handler = proc_nr_files,
1515 },
1516 {
1517 .procname = "file-max",
1518 .data = &files_stat.max_files,
1519 .maxlen = sizeof(files_stat.max_files),
1520 .mode = 0644,
1521 .proc_handler = proc_doulongvec_minmax,
1522 },
1523 {
1524 .procname = "nr_open",
1525 .data = &sysctl_nr_open,
1526 .maxlen = sizeof(int),
1527 .mode = 0644,
1528 .proc_handler = proc_dointvec_minmax,
1529 .extra1 = &sysctl_nr_open_min,
1530 .extra2 = &sysctl_nr_open_max,
1531 },
1532 {
1533 .procname = "dentry-state",
1534 .data = &dentry_stat,
1535 .maxlen = 6*sizeof(long),
1536 .mode = 0444,
1537 .proc_handler = proc_nr_dentry,
1538 },
1539 {
1540 .procname = "overflowuid",
1541 .data = &fs_overflowuid,
1542 .maxlen = sizeof(int),
1543 .mode = 0644,
1544 .proc_handler = proc_dointvec_minmax,
1545 .extra1 = &minolduid,
1546 .extra2 = &maxolduid,
1547 },
1548 {
1549 .procname = "overflowgid",
1550 .data = &fs_overflowgid,
1551 .maxlen = sizeof(int),
1552 .mode = 0644,
1553 .proc_handler = proc_dointvec_minmax,
1554 .extra1 = &minolduid,
1555 .extra2 = &maxolduid,
1556 },
1557 #ifdef CONFIG_FILE_LOCKING
1558 {
1559 .procname = "leases-enable",
1560 .data = &leases_enable,
1561 .maxlen = sizeof(int),
1562 .mode = 0644,
1563 .proc_handler = proc_dointvec,
1564 },
1565 #endif
1566 #ifdef CONFIG_DNOTIFY
1567 {
1568 .procname = "dir-notify-enable",
1569 .data = &dir_notify_enable,
1570 .maxlen = sizeof(int),
1571 .mode = 0644,
1572 .proc_handler = proc_dointvec,
1573 },
1574 #endif
1575 #ifdef CONFIG_MMU
1576 #ifdef CONFIG_FILE_LOCKING
1577 {
1578 .procname = "lease-break-time",
1579 .data = &lease_break_time,
1580 .maxlen = sizeof(int),
1581 .mode = 0644,
1582 .proc_handler = proc_dointvec,
1583 },
1584 #endif
1585 #ifdef CONFIG_AIO
1586 {
1587 .procname = "aio-nr",
1588 .data = &aio_nr,
1589 .maxlen = sizeof(aio_nr),
1590 .mode = 0444,
1591 .proc_handler = proc_doulongvec_minmax,
1592 },
1593 {
1594 .procname = "aio-max-nr",
1595 .data = &aio_max_nr,
1596 .maxlen = sizeof(aio_max_nr),
1597 .mode = 0644,
1598 .proc_handler = proc_doulongvec_minmax,
1599 },
1600 #endif /* CONFIG_AIO */
1601 #ifdef CONFIG_INOTIFY_USER
1602 {
1603 .procname = "inotify",
1604 .mode = 0555,
1605 .child = inotify_table,
1606 },
1607 #endif
1608 #ifdef CONFIG_EPOLL
1609 {
1610 .procname = "epoll",
1611 .mode = 0555,
1612 .child = epoll_table,
1613 },
1614 #endif
1615 #endif
1616 {
1617 .procname = "protected_symlinks",
1618 .data = &sysctl_protected_symlinks,
1619 .maxlen = sizeof(int),
1620 .mode = 0600,
1621 .proc_handler = proc_dointvec_minmax,
1622 .extra1 = &zero,
1623 .extra2 = &one,
1624 },
1625 {
1626 .procname = "protected_hardlinks",
1627 .data = &sysctl_protected_hardlinks,
1628 .maxlen = sizeof(int),
1629 .mode = 0600,
1630 .proc_handler = proc_dointvec_minmax,
1631 .extra1 = &zero,
1632 .extra2 = &one,
1633 },
1634 {
1635 .procname = "suid_dumpable",
1636 .data = &suid_dumpable,
1637 .maxlen = sizeof(int),
1638 .mode = 0644,
1639 .proc_handler = proc_dointvec_minmax_coredump,
1640 .extra1 = &zero,
1641 .extra2 = &two,
1642 },
1643 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1644 {
1645 .procname = "binfmt_misc",
1646 .mode = 0555,
1647 .child = binfmt_misc_table,
1648 },
1649 #endif
1650 {
1651 .procname = "pipe-max-size",
1652 .data = &pipe_max_size,
1653 .maxlen = sizeof(int),
1654 .mode = 0644,
1655 .proc_handler = &pipe_proc_fn,
1656 .extra1 = &pipe_min_size,
1657 },
1658 { }
1659 };
1660
1661 static struct ctl_table debug_table[] = {
1662 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
1663 {
1664 .procname = "exception-trace",
1665 .data = &show_unhandled_signals,
1666 .maxlen = sizeof(int),
1667 .mode = 0644,
1668 .proc_handler = proc_dointvec
1669 },
1670 #endif
1671 #if defined(CONFIG_OPTPROBES)
1672 {
1673 .procname = "kprobes-optimization",
1674 .data = &sysctl_kprobes_optimization,
1675 .maxlen = sizeof(int),
1676 .mode = 0644,
1677 .proc_handler = proc_kprobes_optimization_handler,
1678 .extra1 = &zero,
1679 .extra2 = &one,
1680 },
1681 #endif
1682 { }
1683 };
1684
1685 static struct ctl_table dev_table[] = {
1686 { }
1687 };
1688
1689 int __init sysctl_init(void)
1690 {
1691 struct ctl_table_header *hdr;
1692
1693 hdr = register_sysctl_table(sysctl_base_table);
1694 kmemleak_not_leak(hdr);
1695 return 0;
1696 }
1697
1698 #endif /* CONFIG_SYSCTL */
1699
1700 /*
1701 * /proc/sys support
1702 */
1703
1704 #ifdef CONFIG_PROC_SYSCTL
1705
1706 static int _proc_do_string(char *data, int maxlen, int write,
1707 char __user *buffer,
1708 size_t *lenp, loff_t *ppos)
1709 {
1710 size_t len;
1711 char __user *p;
1712 char c;
1713
1714 if (!data || !maxlen || !*lenp) {
1715 *lenp = 0;
1716 return 0;
1717 }
1718
1719 if (write) {
1720 /* Start writing from beginning of buffer. */
1721 len = 0;
1722 *ppos += *lenp;
1723 p = buffer;
1724 while ((p - buffer) < *lenp && len < maxlen - 1) {
1725 if (get_user(c, p++))
1726 return -EFAULT;
1727 if (c == 0 || c == '\n')
1728 break;
1729 data[len++] = c;
1730 }
1731 data[len] = 0;
1732 } else {
1733 len = strlen(data);
1734 if (len > maxlen)
1735 len = maxlen;
1736
1737 if (*ppos > len) {
1738 *lenp = 0;
1739 return 0;
1740 }
1741
1742 data += *ppos;
1743 len -= *ppos;
1744
1745 if (len > *lenp)
1746 len = *lenp;
1747 if (len)
1748 if (copy_to_user(buffer, data, len))
1749 return -EFAULT;
1750 if (len < *lenp) {
1751 if (put_user('\n', buffer + len))
1752 return -EFAULT;
1753 len++;
1754 }
1755 *lenp = len;
1756 *ppos += len;
1757 }
1758 return 0;
1759 }
1760
1761 /**
1762 * proc_dostring - read a string sysctl
1763 * @table: the sysctl table
1764 * @write: %TRUE if this is a write to the sysctl file
1765 * @buffer: the user buffer
1766 * @lenp: the size of the user buffer
1767 * @ppos: file position
1768 *
1769 * Reads/writes a string from/to the user buffer. If the kernel
1770 * buffer provided is not large enough to hold the string, the
1771 * string is truncated. The copied string is %NULL-terminated.
1772 * If the string is being read by the user process, it is copied
1773 * and a newline '\n' is added. It is truncated if the buffer is
1774 * not large enough.
1775 *
1776 * Returns 0 on success.
1777 */
1778 int proc_dostring(struct ctl_table *table, int write,
1779 void __user *buffer, size_t *lenp, loff_t *ppos)
1780 {
1781 return _proc_do_string((char *)(table->data), table->maxlen, write,
1782 (char __user *)buffer, lenp, ppos);
1783 }
1784
1785 static size_t proc_skip_spaces(char **buf)
1786 {
1787 size_t ret;
1788 char *tmp = skip_spaces(*buf);
1789 ret = tmp - *buf;
1790 *buf = tmp;
1791 return ret;
1792 }
1793
1794 static void proc_skip_char(char **buf, size_t *size, const char v)
1795 {
1796 while (*size) {
1797 if (**buf != v)
1798 break;
1799 (*size)--;
1800 (*buf)++;
1801 }
1802 }
1803
1804 #define TMPBUFLEN 22
1805 /**
1806 * proc_get_long - reads an ASCII formatted integer from a user buffer
1807 *
1808 * @buf: a kernel buffer
1809 * @size: size of the kernel buffer
1810 * @val: this is where the number will be stored
1811 * @neg: set to %TRUE if number is negative
1812 * @perm_tr: a vector which contains the allowed trailers
1813 * @perm_tr_len: size of the perm_tr vector
1814 * @tr: pointer to store the trailer character
1815 *
1816 * In case of success %0 is returned and @buf and @size are updated with
1817 * the amount of bytes read. If @tr is non-NULL and a trailing
1818 * character exists (size is non-zero after returning from this
1819 * function), @tr is updated with the trailing character.
1820 */
1821 static int proc_get_long(char **buf, size_t *size,
1822 unsigned long *val, bool *neg,
1823 const char *perm_tr, unsigned perm_tr_len, char *tr)
1824 {
1825 int len;
1826 char *p, tmp[TMPBUFLEN];
1827
1828 if (!*size)
1829 return -EINVAL;
1830
1831 len = *size;
1832 if (len > TMPBUFLEN - 1)
1833 len = TMPBUFLEN - 1;
1834
1835 memcpy(tmp, *buf, len);
1836
1837 tmp[len] = 0;
1838 p = tmp;
1839 if (*p == '-' && *size > 1) {
1840 *neg = true;
1841 p++;
1842 } else
1843 *neg = false;
1844 if (!isdigit(*p))
1845 return -EINVAL;
1846
1847 *val = simple_strtoul(p, &p, 0);
1848
1849 len = p - tmp;
1850
1851 /* We don't know if the next char is whitespace thus we may accept
1852 * invalid integers (e.g. 1234...a) or two integers instead of one
1853 * (e.g. 123...1). So lets not allow such large numbers. */
1854 if (len == TMPBUFLEN - 1)
1855 return -EINVAL;
1856
1857 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
1858 return -EINVAL;
1859
1860 if (tr && (len < *size))
1861 *tr = *p;
1862
1863 *buf += len;
1864 *size -= len;
1865
1866 return 0;
1867 }
1868
1869 /**
1870 * proc_put_long - converts an integer to a decimal ASCII formatted string
1871 *
1872 * @buf: the user buffer
1873 * @size: the size of the user buffer
1874 * @val: the integer to be converted
1875 * @neg: sign of the number, %TRUE for negative
1876 *
1877 * In case of success %0 is returned and @buf and @size are updated with
1878 * the amount of bytes written.
1879 */
1880 static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
1881 bool neg)
1882 {
1883 int len;
1884 char tmp[TMPBUFLEN], *p = tmp;
1885
1886 sprintf(p, "%s%lu", neg ? "-" : "", val);
1887 len = strlen(tmp);
1888 if (len > *size)
1889 len = *size;
1890 if (copy_to_user(*buf, tmp, len))
1891 return -EFAULT;
1892 *size -= len;
1893 *buf += len;
1894 return 0;
1895 }
1896 #undef TMPBUFLEN
1897
1898 static int proc_put_char(void __user **buf, size_t *size, char c)
1899 {
1900 if (*size) {
1901 char __user **buffer = (char __user **)buf;
1902 if (put_user(c, *buffer))
1903 return -EFAULT;
1904 (*size)--, (*buffer)++;
1905 *buf = *buffer;
1906 }
1907 return 0;
1908 }
1909
1910 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
1911 int *valp,
1912 int write, void *data)
1913 {
1914 if (write) {
1915 *valp = *negp ? -*lvalp : *lvalp;
1916 } else {
1917 int val = *valp;
1918 if (val < 0) {
1919 *negp = true;
1920 *lvalp = (unsigned long)-val;
1921 } else {
1922 *negp = false;
1923 *lvalp = (unsigned long)val;
1924 }
1925 }
1926 return 0;
1927 }
1928
1929 static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
1930
1931 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
1932 int write, void __user *buffer,
1933 size_t *lenp, loff_t *ppos,
1934 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
1935 int write, void *data),
1936 void *data)
1937 {
1938 int *i, vleft, first = 1, err = 0;
1939 unsigned long page = 0;
1940 size_t left;
1941 char *kbuf;
1942
1943 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
1944 *lenp = 0;
1945 return 0;
1946 }
1947
1948 i = (int *) tbl_data;
1949 vleft = table->maxlen / sizeof(*i);
1950 left = *lenp;
1951
1952 if (!conv)
1953 conv = do_proc_dointvec_conv;
1954
1955 if (write) {
1956 if (left > PAGE_SIZE - 1)
1957 left = PAGE_SIZE - 1;
1958 page = __get_free_page(GFP_TEMPORARY);
1959 kbuf = (char *) page;
1960 if (!kbuf)
1961 return -ENOMEM;
1962 if (copy_from_user(kbuf, buffer, left)) {
1963 err = -EFAULT;
1964 goto free;
1965 }
1966 kbuf[left] = 0;
1967 }
1968
1969 for (; left && vleft--; i++, first=0) {
1970 unsigned long lval;
1971 bool neg;
1972
1973 if (write) {
1974 left -= proc_skip_spaces(&kbuf);
1975
1976 if (!left)
1977 break;
1978 err = proc_get_long(&kbuf, &left, &lval, &neg,
1979 proc_wspace_sep,
1980 sizeof(proc_wspace_sep), NULL);
1981 if (err)
1982 break;
1983 if (conv(&neg, &lval, i, 1, data)) {
1984 err = -EINVAL;
1985 break;
1986 }
1987 } else {
1988 if (conv(&neg, &lval, i, 0, data)) {
1989 err = -EINVAL;
1990 break;
1991 }
1992 if (!first)
1993 err = proc_put_char(&buffer, &left, '\t');
1994 if (err)
1995 break;
1996 err = proc_put_long(&buffer, &left, lval, neg);
1997 if (err)
1998 break;
1999 }
2000 }
2001
2002 if (!write && !first && left && !err)
2003 err = proc_put_char(&buffer, &left, '\n');
2004 if (write && !err && left)
2005 left -= proc_skip_spaces(&kbuf);
2006 free:
2007 if (write) {
2008 free_page(page);
2009 if (first)
2010 return err ? : -EINVAL;
2011 }
2012 *lenp -= left;
2013 *ppos += *lenp;
2014 return err;
2015 }
2016
2017 static int do_proc_dointvec(struct ctl_table *table, int write,
2018 void __user *buffer, size_t *lenp, loff_t *ppos,
2019 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2020 int write, void *data),
2021 void *data)
2022 {
2023 return __do_proc_dointvec(table->data, table, write,
2024 buffer, lenp, ppos, conv, data);
2025 }
2026
2027 /**
2028 * proc_dointvec - read a vector of integers
2029 * @table: the sysctl table
2030 * @write: %TRUE if this is a write to the sysctl file
2031 * @buffer: the user buffer
2032 * @lenp: the size of the user buffer
2033 * @ppos: file position
2034 *
2035 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2036 * values from/to the user buffer, treated as an ASCII string.
2037 *
2038 * Returns 0 on success.
2039 */
2040 int proc_dointvec(struct ctl_table *table, int write,
2041 void __user *buffer, size_t *lenp, loff_t *ppos)
2042 {
2043 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2044 NULL,NULL);
2045 }
2046
2047 /*
2048 * Taint values can only be increased
2049 * This means we can safely use a temporary.
2050 */
2051 static int proc_taint(struct ctl_table *table, int write,
2052 void __user *buffer, size_t *lenp, loff_t *ppos)
2053 {
2054 struct ctl_table t;
2055 unsigned long tmptaint = get_taint();
2056 int err;
2057
2058 if (write && !capable(CAP_SYS_ADMIN))
2059 return -EPERM;
2060
2061 t = *table;
2062 t.data = &tmptaint;
2063 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
2064 if (err < 0)
2065 return err;
2066
2067 if (write) {
2068 /*
2069 * Poor man's atomic or. Not worth adding a primitive
2070 * to everyone's atomic.h for this
2071 */
2072 int i;
2073 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2074 if ((tmptaint >> i) & 1)
2075 add_taint(i, LOCKDEP_STILL_OK);
2076 }
2077 }
2078
2079 return err;
2080 }
2081
2082 #ifdef CONFIG_PRINTK
2083 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
2084 void __user *buffer, size_t *lenp, loff_t *ppos)
2085 {
2086 if (write && !capable(CAP_SYS_ADMIN))
2087 return -EPERM;
2088
2089 return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2090 }
2091 #endif
2092
2093 struct do_proc_dointvec_minmax_conv_param {
2094 int *min;
2095 int *max;
2096 };
2097
2098 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
2099 int *valp,
2100 int write, void *data)
2101 {
2102 struct do_proc_dointvec_minmax_conv_param *param = data;
2103 if (write) {
2104 int val = *negp ? -*lvalp : *lvalp;
2105 if ((param->min && *param->min > val) ||
2106 (param->max && *param->max < val))
2107 return -EINVAL;
2108 *valp = val;
2109 } else {
2110 int val = *valp;
2111 if (val < 0) {
2112 *negp = true;
2113 *lvalp = (unsigned long)-val;
2114 } else {
2115 *negp = false;
2116 *lvalp = (unsigned long)val;
2117 }
2118 }
2119 return 0;
2120 }
2121
2122 /**
2123 * proc_dointvec_minmax - read a vector of integers with min/max values
2124 * @table: the sysctl table
2125 * @write: %TRUE if this is a write to the sysctl file
2126 * @buffer: the user buffer
2127 * @lenp: the size of the user buffer
2128 * @ppos: file position
2129 *
2130 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2131 * values from/to the user buffer, treated as an ASCII string.
2132 *
2133 * This routine will ensure the values are within the range specified by
2134 * table->extra1 (min) and table->extra2 (max).
2135 *
2136 * Returns 0 on success.
2137 */
2138 int proc_dointvec_minmax(struct ctl_table *table, int write,
2139 void __user *buffer, size_t *lenp, loff_t *ppos)
2140 {
2141 struct do_proc_dointvec_minmax_conv_param param = {
2142 .min = (int *) table->extra1,
2143 .max = (int *) table->extra2,
2144 };
2145 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2146 do_proc_dointvec_minmax_conv, &param);
2147 }
2148
2149 static void validate_coredump_safety(void)
2150 {
2151 #ifdef CONFIG_COREDUMP
2152 if (suid_dumpable == SUID_DUMP_ROOT &&
2153 core_pattern[0] != '/' && core_pattern[0] != '|') {
2154 printk(KERN_WARNING "Unsafe core_pattern used with "\
2155 "suid_dumpable=2. Pipe handler or fully qualified "\
2156 "core dump path required.\n");
2157 }
2158 #endif
2159 }
2160
2161 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
2162 void __user *buffer, size_t *lenp, loff_t *ppos)
2163 {
2164 int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2165 if (!error)
2166 validate_coredump_safety();
2167 return error;
2168 }
2169
2170 #ifdef CONFIG_COREDUMP
2171 static int proc_dostring_coredump(struct ctl_table *table, int write,
2172 void __user *buffer, size_t *lenp, loff_t *ppos)
2173 {
2174 int error = proc_dostring(table, write, buffer, lenp, ppos);
2175 if (!error)
2176 validate_coredump_safety();
2177 return error;
2178 }
2179 #endif
2180
2181 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2182 void __user *buffer,
2183 size_t *lenp, loff_t *ppos,
2184 unsigned long convmul,
2185 unsigned long convdiv)
2186 {
2187 unsigned long *i, *min, *max;
2188 int vleft, first = 1, err = 0;
2189 unsigned long page = 0;
2190 size_t left;
2191 char *kbuf;
2192
2193 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
2194 *lenp = 0;
2195 return 0;
2196 }
2197
2198 i = (unsigned long *) data;
2199 min = (unsigned long *) table->extra1;
2200 max = (unsigned long *) table->extra2;
2201 vleft = table->maxlen / sizeof(unsigned long);
2202 left = *lenp;
2203
2204 if (write) {
2205 if (left > PAGE_SIZE - 1)
2206 left = PAGE_SIZE - 1;
2207 page = __get_free_page(GFP_TEMPORARY);
2208 kbuf = (char *) page;
2209 if (!kbuf)
2210 return -ENOMEM;
2211 if (copy_from_user(kbuf, buffer, left)) {
2212 err = -EFAULT;
2213 goto free;
2214 }
2215 kbuf[left] = 0;
2216 }
2217
2218 for (; left && vleft--; i++, first = 0) {
2219 unsigned long val;
2220
2221 if (write) {
2222 bool neg;
2223
2224 left -= proc_skip_spaces(&kbuf);
2225
2226 err = proc_get_long(&kbuf, &left, &val, &neg,
2227 proc_wspace_sep,
2228 sizeof(proc_wspace_sep), NULL);
2229 if (err)
2230 break;
2231 if (neg)
2232 continue;
2233 if ((min && val < *min) || (max && val > *max))
2234 continue;
2235 *i = val;
2236 } else {
2237 val = convdiv * (*i) / convmul;
2238 if (!first) {
2239 err = proc_put_char(&buffer, &left, '\t');
2240 if (err)
2241 break;
2242 }
2243 err = proc_put_long(&buffer, &left, val, false);
2244 if (err)
2245 break;
2246 }
2247 }
2248
2249 if (!write && !first && left && !err)
2250 err = proc_put_char(&buffer, &left, '\n');
2251 if (write && !err)
2252 left -= proc_skip_spaces(&kbuf);
2253 free:
2254 if (write) {
2255 free_page(page);
2256 if (first)
2257 return err ? : -EINVAL;
2258 }
2259 *lenp -= left;
2260 *ppos += *lenp;
2261 return err;
2262 }
2263
2264 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2265 void __user *buffer,
2266 size_t *lenp, loff_t *ppos,
2267 unsigned long convmul,
2268 unsigned long convdiv)
2269 {
2270 return __do_proc_doulongvec_minmax(table->data, table, write,
2271 buffer, lenp, ppos, convmul, convdiv);
2272 }
2273
2274 /**
2275 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2276 * @table: the sysctl table
2277 * @write: %TRUE if this is a write to the sysctl file
2278 * @buffer: the user buffer
2279 * @lenp: the size of the user buffer
2280 * @ppos: file position
2281 *
2282 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2283 * values from/to the user buffer, treated as an ASCII string.
2284 *
2285 * This routine will ensure the values are within the range specified by
2286 * table->extra1 (min) and table->extra2 (max).
2287 *
2288 * Returns 0 on success.
2289 */
2290 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2291 void __user *buffer, size_t *lenp, loff_t *ppos)
2292 {
2293 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
2294 }
2295
2296 /**
2297 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2298 * @table: the sysctl table
2299 * @write: %TRUE if this is a write to the sysctl file
2300 * @buffer: the user buffer
2301 * @lenp: the size of the user buffer
2302 * @ppos: file position
2303 *
2304 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2305 * values from/to the user buffer, treated as an ASCII string. The values
2306 * are treated as milliseconds, and converted to jiffies when they are stored.
2307 *
2308 * This routine will ensure the values are within the range specified by
2309 * table->extra1 (min) and table->extra2 (max).
2310 *
2311 * Returns 0 on success.
2312 */
2313 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2314 void __user *buffer,
2315 size_t *lenp, loff_t *ppos)
2316 {
2317 return do_proc_doulongvec_minmax(table, write, buffer,
2318 lenp, ppos, HZ, 1000l);
2319 }
2320
2321
2322 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
2323 int *valp,
2324 int write, void *data)
2325 {
2326 if (write) {
2327 if (*lvalp > LONG_MAX / HZ)
2328 return 1;
2329 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2330 } else {
2331 int val = *valp;
2332 unsigned long lval;
2333 if (val < 0) {
2334 *negp = true;
2335 lval = (unsigned long)-val;
2336 } else {
2337 *negp = false;
2338 lval = (unsigned long)val;
2339 }
2340 *lvalp = lval / HZ;
2341 }
2342 return 0;
2343 }
2344
2345 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
2346 int *valp,
2347 int write, void *data)
2348 {
2349 if (write) {
2350 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2351 return 1;
2352 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2353 } else {
2354 int val = *valp;
2355 unsigned long lval;
2356 if (val < 0) {
2357 *negp = true;
2358 lval = (unsigned long)-val;
2359 } else {
2360 *negp = false;
2361 lval = (unsigned long)val;
2362 }
2363 *lvalp = jiffies_to_clock_t(lval);
2364 }
2365 return 0;
2366 }
2367
2368 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
2369 int *valp,
2370 int write, void *data)
2371 {
2372 if (write) {
2373 unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2374
2375 if (jif > INT_MAX)
2376 return 1;
2377 *valp = (int)jif;
2378 } else {
2379 int val = *valp;
2380 unsigned long lval;
2381 if (val < 0) {
2382 *negp = true;
2383 lval = (unsigned long)-val;
2384 } else {
2385 *negp = false;
2386 lval = (unsigned long)val;
2387 }
2388 *lvalp = jiffies_to_msecs(lval);
2389 }
2390 return 0;
2391 }
2392
2393 /**
2394 * proc_dointvec_jiffies - read a vector of integers as seconds
2395 * @table: the sysctl table
2396 * @write: %TRUE if this is a write to the sysctl file
2397 * @buffer: the user buffer
2398 * @lenp: the size of the user buffer
2399 * @ppos: file position
2400 *
2401 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2402 * values from/to the user buffer, treated as an ASCII string.
2403 * The values read are assumed to be in seconds, and are converted into
2404 * jiffies.
2405 *
2406 * Returns 0 on success.
2407 */
2408 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2409 void __user *buffer, size_t *lenp, loff_t *ppos)
2410 {
2411 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2412 do_proc_dointvec_jiffies_conv,NULL);
2413 }
2414
2415 /**
2416 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2417 * @table: the sysctl table
2418 * @write: %TRUE if this is a write to the sysctl file
2419 * @buffer: the user buffer
2420 * @lenp: the size of the user buffer
2421 * @ppos: pointer to the file position
2422 *
2423 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2424 * values from/to the user buffer, treated as an ASCII string.
2425 * The values read are assumed to be in 1/USER_HZ seconds, and
2426 * are converted into jiffies.
2427 *
2428 * Returns 0 on success.
2429 */
2430 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2431 void __user *buffer, size_t *lenp, loff_t *ppos)
2432 {
2433 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2434 do_proc_dointvec_userhz_jiffies_conv,NULL);
2435 }
2436
2437 /**
2438 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2439 * @table: the sysctl table
2440 * @write: %TRUE if this is a write to the sysctl file
2441 * @buffer: the user buffer
2442 * @lenp: the size of the user buffer
2443 * @ppos: file position
2444 * @ppos: the current position in the file
2445 *
2446 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2447 * values from/to the user buffer, treated as an ASCII string.
2448 * The values read are assumed to be in 1/1000 seconds, and
2449 * are converted into jiffies.
2450 *
2451 * Returns 0 on success.
2452 */
2453 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2454 void __user *buffer, size_t *lenp, loff_t *ppos)
2455 {
2456 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2457 do_proc_dointvec_ms_jiffies_conv, NULL);
2458 }
2459
2460 static int proc_do_cad_pid(struct ctl_table *table, int write,
2461 void __user *buffer, size_t *lenp, loff_t *ppos)
2462 {
2463 struct pid *new_pid;
2464 pid_t tmp;
2465 int r;
2466
2467 tmp = pid_vnr(cad_pid);
2468
2469 r = __do_proc_dointvec(&tmp, table, write, buffer,
2470 lenp, ppos, NULL, NULL);
2471 if (r || !write)
2472 return r;
2473
2474 new_pid = find_get_pid(tmp);
2475 if (!new_pid)
2476 return -ESRCH;
2477
2478 put_pid(xchg(&cad_pid, new_pid));
2479 return 0;
2480 }
2481
2482 /**
2483 * proc_do_large_bitmap - read/write from/to a large bitmap
2484 * @table: the sysctl table
2485 * @write: %TRUE if this is a write to the sysctl file
2486 * @buffer: the user buffer
2487 * @lenp: the size of the user buffer
2488 * @ppos: file position
2489 *
2490 * The bitmap is stored at table->data and the bitmap length (in bits)
2491 * in table->maxlen.
2492 *
2493 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2494 * large bitmaps may be represented in a compact manner. Writing into
2495 * the file will clear the bitmap then update it with the given input.
2496 *
2497 * Returns 0 on success.
2498 */
2499 int proc_do_large_bitmap(struct ctl_table *table, int write,
2500 void __user *buffer, size_t *lenp, loff_t *ppos)
2501 {
2502 int err = 0;
2503 bool first = 1;
2504 size_t left = *lenp;
2505 unsigned long bitmap_len = table->maxlen;
2506 unsigned long *bitmap = (unsigned long *) table->data;
2507 unsigned long *tmp_bitmap = NULL;
2508 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
2509
2510 if (!bitmap_len || !left || (*ppos && !write)) {
2511 *lenp = 0;
2512 return 0;
2513 }
2514
2515 if (write) {
2516 unsigned long page = 0;
2517 char *kbuf;
2518
2519 if (left > PAGE_SIZE - 1)
2520 left = PAGE_SIZE - 1;
2521
2522 page = __get_free_page(GFP_TEMPORARY);
2523 kbuf = (char *) page;
2524 if (!kbuf)
2525 return -ENOMEM;
2526 if (copy_from_user(kbuf, buffer, left)) {
2527 free_page(page);
2528 return -EFAULT;
2529 }
2530 kbuf[left] = 0;
2531
2532 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long),
2533 GFP_KERNEL);
2534 if (!tmp_bitmap) {
2535 free_page(page);
2536 return -ENOMEM;
2537 }
2538 proc_skip_char(&kbuf, &left, '\n');
2539 while (!err && left) {
2540 unsigned long val_a, val_b;
2541 bool neg;
2542
2543 err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a,
2544 sizeof(tr_a), &c);
2545 if (err)
2546 break;
2547 if (val_a >= bitmap_len || neg) {
2548 err = -EINVAL;
2549 break;
2550 }
2551
2552 val_b = val_a;
2553 if (left) {
2554 kbuf++;
2555 left--;
2556 }
2557
2558 if (c == '-') {
2559 err = proc_get_long(&kbuf, &left, &val_b,
2560 &neg, tr_b, sizeof(tr_b),
2561 &c);
2562 if (err)
2563 break;
2564 if (val_b >= bitmap_len || neg ||
2565 val_a > val_b) {
2566 err = -EINVAL;
2567 break;
2568 }
2569 if (left) {
2570 kbuf++;
2571 left--;
2572 }
2573 }
2574
2575 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
2576 first = 0;
2577 proc_skip_char(&kbuf, &left, '\n');
2578 }
2579 free_page(page);
2580 } else {
2581 unsigned long bit_a, bit_b = 0;
2582
2583 while (left) {
2584 bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
2585 if (bit_a >= bitmap_len)
2586 break;
2587 bit_b = find_next_zero_bit(bitmap, bitmap_len,
2588 bit_a + 1) - 1;
2589
2590 if (!first) {
2591 err = proc_put_char(&buffer, &left, ',');
2592 if (err)
2593 break;
2594 }
2595 err = proc_put_long(&buffer, &left, bit_a, false);
2596 if (err)
2597 break;
2598 if (bit_a != bit_b) {
2599 err = proc_put_char(&buffer, &left, '-');
2600 if (err)
2601 break;
2602 err = proc_put_long(&buffer, &left, bit_b, false);
2603 if (err)
2604 break;
2605 }
2606
2607 first = 0; bit_b++;
2608 }
2609 if (!err)
2610 err = proc_put_char(&buffer, &left, '\n');
2611 }
2612
2613 if (!err) {
2614 if (write) {
2615 if (*ppos)
2616 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
2617 else
2618 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
2619 }
2620 kfree(tmp_bitmap);
2621 *lenp -= left;
2622 *ppos += *lenp;
2623 return 0;
2624 } else {
2625 kfree(tmp_bitmap);
2626 return err;
2627 }
2628 }
2629
2630 #else /* CONFIG_PROC_SYSCTL */
2631
2632 int proc_dostring(struct ctl_table *table, int write,
2633 void __user *buffer, size_t *lenp, loff_t *ppos)
2634 {
2635 return -ENOSYS;
2636 }
2637
2638 int proc_dointvec(struct ctl_table *table, int write,
2639 void __user *buffer, size_t *lenp, loff_t *ppos)
2640 {
2641 return -ENOSYS;
2642 }
2643
2644 int proc_dointvec_minmax(struct ctl_table *table, int write,
2645 void __user *buffer, size_t *lenp, loff_t *ppos)
2646 {
2647 return -ENOSYS;
2648 }
2649
2650 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2651 void __user *buffer, size_t *lenp, loff_t *ppos)
2652 {
2653 return -ENOSYS;
2654 }
2655
2656 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2657 void __user *buffer, size_t *lenp, loff_t *ppos)
2658 {
2659 return -ENOSYS;
2660 }
2661
2662 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2663 void __user *buffer, size_t *lenp, loff_t *ppos)
2664 {
2665 return -ENOSYS;
2666 }
2667
2668 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2669 void __user *buffer, size_t *lenp, loff_t *ppos)
2670 {
2671 return -ENOSYS;
2672 }
2673
2674 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2675 void __user *buffer,
2676 size_t *lenp, loff_t *ppos)
2677 {
2678 return -ENOSYS;
2679 }
2680
2681
2682 #endif /* CONFIG_PROC_SYSCTL */
2683
2684 /*
2685 * No sense putting this after each symbol definition, twice,
2686 * exception granted :-)
2687 */
2688 EXPORT_SYMBOL(proc_dointvec);
2689 EXPORT_SYMBOL(proc_dointvec_jiffies);
2690 EXPORT_SYMBOL(proc_dointvec_minmax);
2691 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2692 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2693 EXPORT_SYMBOL(proc_dostring);
2694 EXPORT_SYMBOL(proc_doulongvec_minmax);
2695 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
Linux kernel - Deliverables
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