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hung_task: check the value of "sysctl_hung_task_timeout_sec"
[GitHub/mt8127/android_kernel_alcatel_ttab.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
66 #include <asm/uaccess.h>
67 #include <asm/processor.h>
68
69 #ifdef CONFIG_X86
70 #include <asm/nmi.h>
71 #include <asm/stacktrace.h>
72 #include <asm/io.h>
73 #endif
74 #ifdef CONFIG_SPARC
75 #include <asm/setup.h>
76 #endif
77 #ifdef CONFIG_BSD_PROCESS_ACCT
78 #include <linux/acct.h>
79 #endif
80 #ifdef CONFIG_RT_MUTEXES
81 #include <linux/rtmutex.h>
82 #endif
83 #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
84 #include <linux/lockdep.h>
85 #endif
86 #ifdef CONFIG_CHR_DEV_SG
87 #include <scsi/sg.h>
88 #endif
89
90 #ifdef CONFIG_LOCKUP_DETECTOR
91 #include <linux/nmi.h>
92 #endif
93
94
95 #if defined(CONFIG_SYSCTL)
96
97 /* External variables not in a header file. */
98 extern int sysctl_overcommit_memory;
99 extern int sysctl_overcommit_ratio;
100 extern int max_threads;
101 extern int suid_dumpable;
102 #ifdef CONFIG_COREDUMP
103 extern int core_uses_pid;
104 extern char core_pattern[];
105 extern unsigned int core_pipe_limit;
106 #endif
107 extern int pid_max;
108 extern int pid_max_min, pid_max_max;
109 extern int percpu_pagelist_fraction;
110 extern int compat_log;
111 extern int latencytop_enabled;
112 extern int sysctl_nr_open_min, sysctl_nr_open_max;
113 #ifndef CONFIG_MMU
114 extern int sysctl_nr_trim_pages;
115 #endif
116 #ifdef CONFIG_BLOCK
117 extern int blk_iopoll_enabled;
118 #endif
119
120 /* Constants used for minimum and maximum */
121 #ifdef CONFIG_LOCKUP_DETECTOR
122 static int sixty = 60;
123 static int neg_one = -1;
124 #endif
125
126 static int zero;
127 static int __maybe_unused one = 1;
128 static int __maybe_unused two = 2;
129 static int __maybe_unused three = 3;
130 static unsigned long one_ul = 1;
131 static int one_hundred = 100;
132 #ifdef CONFIG_PRINTK
133 static int ten_thousand = 10000;
134 #endif
135
136 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
137 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
138
139 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
140 static int maxolduid = 65535;
141 static int minolduid;
142 static int min_percpu_pagelist_fract = 8;
143
144 static int ngroups_max = NGROUPS_MAX;
145 static const int cap_last_cap = CAP_LAST_CAP;
146
147 /*this is needed for proc_doulongvec_minmax of sysctl_hung_task_timeout_secs */
148 #ifdef CONFIG_DETECT_HUNG_TASK
149 static unsigned long hung_task_timeout_max = (LONG_MAX/HZ);
150 #endif
151
152 #ifdef CONFIG_INOTIFY_USER
153 #include <linux/inotify.h>
154 #endif
155 #ifdef CONFIG_SPARC
156 #endif
157
158 #ifdef CONFIG_SPARC64
159 extern int sysctl_tsb_ratio;
160 #endif
161
162 #ifdef __hppa__
163 extern int pwrsw_enabled;
164 #endif
165
166 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
167 extern int unaligned_enabled;
168 #endif
169
170 #ifdef CONFIG_IA64
171 extern int unaligned_dump_stack;
172 #endif
173
174 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
175 extern int no_unaligned_warning;
176 #endif
177
178 #ifdef CONFIG_PROC_SYSCTL
179 static int proc_do_cad_pid(struct ctl_table *table, int write,
180 void __user *buffer, size_t *lenp, loff_t *ppos);
181 static int proc_taint(struct ctl_table *table, int write,
182 void __user *buffer, size_t *lenp, loff_t *ppos);
183 #endif
184
185 #ifdef CONFIG_PRINTK
186 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
187 void __user *buffer, size_t *lenp, loff_t *ppos);
188 #endif
189
190 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
191 void __user *buffer, size_t *lenp, loff_t *ppos);
192 #ifdef CONFIG_COREDUMP
193 static int proc_dostring_coredump(struct ctl_table *table, int write,
194 void __user *buffer, size_t *lenp, loff_t *ppos);
195 #endif
196
197 #ifdef CONFIG_MAGIC_SYSRQ
198 /* Note: sysrq code uses it's own private copy */
199 static int __sysrq_enabled = SYSRQ_DEFAULT_ENABLE;
200
201 static int sysrq_sysctl_handler(ctl_table *table, int write,
202 void __user *buffer, size_t *lenp,
203 loff_t *ppos)
204 {
205 int error;
206
207 error = proc_dointvec(table, write, buffer, lenp, ppos);
208 if (error)
209 return error;
210
211 if (write)
212 sysrq_toggle_support(__sysrq_enabled);
213
214 return 0;
215 }
216
217 #endif
218
219 static struct ctl_table kern_table[];
220 static struct ctl_table vm_table[];
221 static struct ctl_table fs_table[];
222 static struct ctl_table debug_table[];
223 static struct ctl_table dev_table[];
224 extern struct ctl_table random_table[];
225 #ifdef CONFIG_EPOLL
226 extern struct ctl_table epoll_table[];
227 #endif
228
229 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
230 int sysctl_legacy_va_layout;
231 #endif
232
233 /* The default sysctl tables: */
234
235 static struct ctl_table sysctl_base_table[] = {
236 {
237 .procname = "kernel",
238 .mode = 0555,
239 .child = kern_table,
240 },
241 {
242 .procname = "vm",
243 .mode = 0555,
244 .child = vm_table,
245 },
246 {
247 .procname = "fs",
248 .mode = 0555,
249 .child = fs_table,
250 },
251 {
252 .procname = "debug",
253 .mode = 0555,
254 .child = debug_table,
255 },
256 {
257 .procname = "dev",
258 .mode = 0555,
259 .child = dev_table,
260 },
261 { }
262 };
263
264 #ifdef CONFIG_SCHED_DEBUG
265 static int min_sched_granularity_ns = 100000; /* 100 usecs */
266 static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */
267 static int min_wakeup_granularity_ns; /* 0 usecs */
268 static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */
269 #ifdef CONFIG_SMP
270 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
271 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
272 #endif /* CONFIG_SMP */
273 #endif /* CONFIG_SCHED_DEBUG */
274
275 #ifdef CONFIG_COMPACTION
276 static int min_extfrag_threshold;
277 static int max_extfrag_threshold = 1000;
278 #endif
279
280 static struct ctl_table kern_table[] = {
281 {
282 .procname = "sched_child_runs_first",
283 .data = &sysctl_sched_child_runs_first,
284 .maxlen = sizeof(unsigned int),
285 .mode = 0644,
286 .proc_handler = proc_dointvec,
287 },
288 #ifdef CONFIG_SCHED_DEBUG
289 {
290 .procname = "sched_min_granularity_ns",
291 .data = &sysctl_sched_min_granularity,
292 .maxlen = sizeof(unsigned int),
293 .mode = 0644,
294 .proc_handler = sched_proc_update_handler,
295 .extra1 = &min_sched_granularity_ns,
296 .extra2 = &max_sched_granularity_ns,
297 },
298 {
299 .procname = "sched_latency_ns",
300 .data = &sysctl_sched_latency,
301 .maxlen = sizeof(unsigned int),
302 .mode = 0644,
303 .proc_handler = sched_proc_update_handler,
304 .extra1 = &min_sched_granularity_ns,
305 .extra2 = &max_sched_granularity_ns,
306 },
307 {
308 .procname = "sched_wakeup_granularity_ns",
309 .data = &sysctl_sched_wakeup_granularity,
310 .maxlen = sizeof(unsigned int),
311 .mode = 0644,
312 .proc_handler = sched_proc_update_handler,
313 .extra1 = &min_wakeup_granularity_ns,
314 .extra2 = &max_wakeup_granularity_ns,
315 },
316 #ifdef CONFIG_SMP
317 {
318 .procname = "sched_tunable_scaling",
319 .data = &sysctl_sched_tunable_scaling,
320 .maxlen = sizeof(enum sched_tunable_scaling),
321 .mode = 0644,
322 .proc_handler = sched_proc_update_handler,
323 .extra1 = &min_sched_tunable_scaling,
324 .extra2 = &max_sched_tunable_scaling,
325 },
326 {
327 .procname = "sched_migration_cost_ns",
328 .data = &sysctl_sched_migration_cost,
329 .maxlen = sizeof(unsigned int),
330 .mode = 0644,
331 .proc_handler = proc_dointvec,
332 },
333 {
334 .procname = "sched_nr_migrate",
335 .data = &sysctl_sched_nr_migrate,
336 .maxlen = sizeof(unsigned int),
337 .mode = 0644,
338 .proc_handler = proc_dointvec,
339 },
340 {
341 .procname = "sched_time_avg_ms",
342 .data = &sysctl_sched_time_avg,
343 .maxlen = sizeof(unsigned int),
344 .mode = 0644,
345 .proc_handler = proc_dointvec,
346 },
347 {
348 .procname = "sched_shares_window_ns",
349 .data = &sysctl_sched_shares_window,
350 .maxlen = sizeof(unsigned int),
351 .mode = 0644,
352 .proc_handler = proc_dointvec,
353 },
354 {
355 .procname = "timer_migration",
356 .data = &sysctl_timer_migration,
357 .maxlen = sizeof(unsigned int),
358 .mode = 0644,
359 .proc_handler = proc_dointvec_minmax,
360 .extra1 = &zero,
361 .extra2 = &one,
362 },
363 #endif /* CONFIG_SMP */
364 #ifdef CONFIG_NUMA_BALANCING
365 {
366 .procname = "numa_balancing_scan_delay_ms",
367 .data = &sysctl_numa_balancing_scan_delay,
368 .maxlen = sizeof(unsigned int),
369 .mode = 0644,
370 .proc_handler = proc_dointvec,
371 },
372 {
373 .procname = "numa_balancing_scan_period_min_ms",
374 .data = &sysctl_numa_balancing_scan_period_min,
375 .maxlen = sizeof(unsigned int),
376 .mode = 0644,
377 .proc_handler = proc_dointvec,
378 },
379 {
380 .procname = "numa_balancing_scan_period_reset",
381 .data = &sysctl_numa_balancing_scan_period_reset,
382 .maxlen = sizeof(unsigned int),
383 .mode = 0644,
384 .proc_handler = proc_dointvec,
385 },
386 {
387 .procname = "numa_balancing_scan_period_max_ms",
388 .data = &sysctl_numa_balancing_scan_period_max,
389 .maxlen = sizeof(unsigned int),
390 .mode = 0644,
391 .proc_handler = proc_dointvec,
392 },
393 {
394 .procname = "numa_balancing_scan_size_mb",
395 .data = &sysctl_numa_balancing_scan_size,
396 .maxlen = sizeof(unsigned int),
397 .mode = 0644,
398 .proc_handler = proc_dointvec,
399 },
400 #endif /* CONFIG_NUMA_BALANCING */
401 #endif /* CONFIG_SCHED_DEBUG */
402 {
403 .procname = "sched_rt_period_us",
404 .data = &sysctl_sched_rt_period,
405 .maxlen = sizeof(unsigned int),
406 .mode = 0644,
407 .proc_handler = sched_rt_handler,
408 },
409 {
410 .procname = "sched_rt_runtime_us",
411 .data = &sysctl_sched_rt_runtime,
412 .maxlen = sizeof(int),
413 .mode = 0644,
414 .proc_handler = sched_rt_handler,
415 },
416 {
417 .procname = "sched_rr_timeslice_ms",
418 .data = &sched_rr_timeslice,
419 .maxlen = sizeof(int),
420 .mode = 0644,
421 .proc_handler = sched_rr_handler,
422 },
423 #ifdef CONFIG_SCHED_AUTOGROUP
424 {
425 .procname = "sched_autogroup_enabled",
426 .data = &sysctl_sched_autogroup_enabled,
427 .maxlen = sizeof(unsigned int),
428 .mode = 0644,
429 .proc_handler = proc_dointvec_minmax,
430 .extra1 = &zero,
431 .extra2 = &one,
432 },
433 #endif
434 #ifdef CONFIG_CFS_BANDWIDTH
435 {
436 .procname = "sched_cfs_bandwidth_slice_us",
437 .data = &sysctl_sched_cfs_bandwidth_slice,
438 .maxlen = sizeof(unsigned int),
439 .mode = 0644,
440 .proc_handler = proc_dointvec_minmax,
441 .extra1 = &one,
442 },
443 #endif
444 #ifdef CONFIG_PROVE_LOCKING
445 {
446 .procname = "prove_locking",
447 .data = &prove_locking,
448 .maxlen = sizeof(int),
449 .mode = 0644,
450 .proc_handler = proc_dointvec,
451 },
452 #endif
453 #ifdef CONFIG_LOCK_STAT
454 {
455 .procname = "lock_stat",
456 .data = &lock_stat,
457 .maxlen = sizeof(int),
458 .mode = 0644,
459 .proc_handler = proc_dointvec,
460 },
461 #endif
462 {
463 .procname = "panic",
464 .data = &panic_timeout,
465 .maxlen = sizeof(int),
466 .mode = 0644,
467 .proc_handler = proc_dointvec,
468 },
469 #ifdef CONFIG_COREDUMP
470 {
471 .procname = "core_uses_pid",
472 .data = &core_uses_pid,
473 .maxlen = sizeof(int),
474 .mode = 0644,
475 .proc_handler = proc_dointvec,
476 },
477 {
478 .procname = "core_pattern",
479 .data = core_pattern,
480 .maxlen = CORENAME_MAX_SIZE,
481 .mode = 0644,
482 .proc_handler = proc_dostring_coredump,
483 },
484 {
485 .procname = "core_pipe_limit",
486 .data = &core_pipe_limit,
487 .maxlen = sizeof(unsigned int),
488 .mode = 0644,
489 .proc_handler = proc_dointvec,
490 },
491 #endif
492 #ifdef CONFIG_PROC_SYSCTL
493 {
494 .procname = "tainted",
495 .maxlen = sizeof(long),
496 .mode = 0644,
497 .proc_handler = proc_taint,
498 },
499 #endif
500 #ifdef CONFIG_LATENCYTOP
501 {
502 .procname = "latencytop",
503 .data = &latencytop_enabled,
504 .maxlen = sizeof(int),
505 .mode = 0644,
506 .proc_handler = proc_dointvec,
507 },
508 #endif
509 #ifdef CONFIG_BLK_DEV_INITRD
510 {
511 .procname = "real-root-dev",
512 .data = &real_root_dev,
513 .maxlen = sizeof(int),
514 .mode = 0644,
515 .proc_handler = proc_dointvec,
516 },
517 #endif
518 {
519 .procname = "print-fatal-signals",
520 .data = &print_fatal_signals,
521 .maxlen = sizeof(int),
522 .mode = 0644,
523 .proc_handler = proc_dointvec,
524 },
525 #ifdef CONFIG_SPARC
526 {
527 .procname = "reboot-cmd",
528 .data = reboot_command,
529 .maxlen = 256,
530 .mode = 0644,
531 .proc_handler = proc_dostring,
532 },
533 {
534 .procname = "stop-a",
535 .data = &stop_a_enabled,
536 .maxlen = sizeof (int),
537 .mode = 0644,
538 .proc_handler = proc_dointvec,
539 },
540 {
541 .procname = "scons-poweroff",
542 .data = &scons_pwroff,
543 .maxlen = sizeof (int),
544 .mode = 0644,
545 .proc_handler = proc_dointvec,
546 },
547 #endif
548 #ifdef CONFIG_SPARC64
549 {
550 .procname = "tsb-ratio",
551 .data = &sysctl_tsb_ratio,
552 .maxlen = sizeof (int),
553 .mode = 0644,
554 .proc_handler = proc_dointvec,
555 },
556 #endif
557 #ifdef __hppa__
558 {
559 .procname = "soft-power",
560 .data = &pwrsw_enabled,
561 .maxlen = sizeof (int),
562 .mode = 0644,
563 .proc_handler = proc_dointvec,
564 },
565 #endif
566 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
567 {
568 .procname = "unaligned-trap",
569 .data = &unaligned_enabled,
570 .maxlen = sizeof (int),
571 .mode = 0644,
572 .proc_handler = proc_dointvec,
573 },
574 #endif
575 {
576 .procname = "ctrl-alt-del",
577 .data = &C_A_D,
578 .maxlen = sizeof(int),
579 .mode = 0644,
580 .proc_handler = proc_dointvec,
581 },
582 #ifdef CONFIG_FUNCTION_TRACER
583 {
584 .procname = "ftrace_enabled",
585 .data = &ftrace_enabled,
586 .maxlen = sizeof(int),
587 .mode = 0644,
588 .proc_handler = ftrace_enable_sysctl,
589 },
590 #endif
591 #ifdef CONFIG_STACK_TRACER
592 {
593 .procname = "stack_tracer_enabled",
594 .data = &stack_tracer_enabled,
595 .maxlen = sizeof(int),
596 .mode = 0644,
597 .proc_handler = stack_trace_sysctl,
598 },
599 #endif
600 #ifdef CONFIG_TRACING
601 {
602 .procname = "ftrace_dump_on_oops",
603 .data = &ftrace_dump_on_oops,
604 .maxlen = sizeof(int),
605 .mode = 0644,
606 .proc_handler = proc_dointvec,
607 },
608 #endif
609 #ifdef CONFIG_MODULES
610 {
611 .procname = "modprobe",
612 .data = &modprobe_path,
613 .maxlen = KMOD_PATH_LEN,
614 .mode = 0644,
615 .proc_handler = proc_dostring,
616 },
617 {
618 .procname = "modules_disabled",
619 .data = &modules_disabled,
620 .maxlen = sizeof(int),
621 .mode = 0644,
622 /* only handle a transition from default "0" to "1" */
623 .proc_handler = proc_dointvec_minmax,
624 .extra1 = &one,
625 .extra2 = &one,
626 },
627 #endif
628
629 {
630 .procname = "hotplug",
631 .data = &uevent_helper,
632 .maxlen = UEVENT_HELPER_PATH_LEN,
633 .mode = 0644,
634 .proc_handler = proc_dostring,
635 },
636
637 #ifdef CONFIG_CHR_DEV_SG
638 {
639 .procname = "sg-big-buff",
640 .data = &sg_big_buff,
641 .maxlen = sizeof (int),
642 .mode = 0444,
643 .proc_handler = proc_dointvec,
644 },
645 #endif
646 #ifdef CONFIG_BSD_PROCESS_ACCT
647 {
648 .procname = "acct",
649 .data = &acct_parm,
650 .maxlen = 3*sizeof(int),
651 .mode = 0644,
652 .proc_handler = proc_dointvec,
653 },
654 #endif
655 #ifdef CONFIG_MAGIC_SYSRQ
656 {
657 .procname = "sysrq",
658 .data = &__sysrq_enabled,
659 .maxlen = sizeof (int),
660 .mode = 0644,
661 .proc_handler = sysrq_sysctl_handler,
662 },
663 #endif
664 #ifdef CONFIG_PROC_SYSCTL
665 {
666 .procname = "cad_pid",
667 .data = NULL,
668 .maxlen = sizeof (int),
669 .mode = 0600,
670 .proc_handler = proc_do_cad_pid,
671 },
672 #endif
673 {
674 .procname = "threads-max",
675 .data = &max_threads,
676 .maxlen = sizeof(int),
677 .mode = 0644,
678 .proc_handler = proc_dointvec,
679 },
680 {
681 .procname = "random",
682 .mode = 0555,
683 .child = random_table,
684 },
685 {
686 .procname = "usermodehelper",
687 .mode = 0555,
688 .child = usermodehelper_table,
689 },
690 {
691 .procname = "overflowuid",
692 .data = &overflowuid,
693 .maxlen = sizeof(int),
694 .mode = 0644,
695 .proc_handler = proc_dointvec_minmax,
696 .extra1 = &minolduid,
697 .extra2 = &maxolduid,
698 },
699 {
700 .procname = "overflowgid",
701 .data = &overflowgid,
702 .maxlen = sizeof(int),
703 .mode = 0644,
704 .proc_handler = proc_dointvec_minmax,
705 .extra1 = &minolduid,
706 .extra2 = &maxolduid,
707 },
708 #ifdef CONFIG_S390
709 #ifdef CONFIG_MATHEMU
710 {
711 .procname = "ieee_emulation_warnings",
712 .data = &sysctl_ieee_emulation_warnings,
713 .maxlen = sizeof(int),
714 .mode = 0644,
715 .proc_handler = proc_dointvec,
716 },
717 #endif
718 {
719 .procname = "userprocess_debug",
720 .data = &show_unhandled_signals,
721 .maxlen = sizeof(int),
722 .mode = 0644,
723 .proc_handler = proc_dointvec,
724 },
725 #endif
726 {
727 .procname = "pid_max",
728 .data = &pid_max,
729 .maxlen = sizeof (int),
730 .mode = 0644,
731 .proc_handler = proc_dointvec_minmax,
732 .extra1 = &pid_max_min,
733 .extra2 = &pid_max_max,
734 },
735 {
736 .procname = "panic_on_oops",
737 .data = &panic_on_oops,
738 .maxlen = sizeof(int),
739 .mode = 0644,
740 .proc_handler = proc_dointvec,
741 },
742 #if defined CONFIG_PRINTK
743 {
744 .procname = "printk",
745 .data = &console_loglevel,
746 .maxlen = 4*sizeof(int),
747 .mode = 0644,
748 .proc_handler = proc_dointvec,
749 },
750 {
751 .procname = "printk_ratelimit",
752 .data = &printk_ratelimit_state.interval,
753 .maxlen = sizeof(int),
754 .mode = 0644,
755 .proc_handler = proc_dointvec_jiffies,
756 },
757 {
758 .procname = "printk_ratelimit_burst",
759 .data = &printk_ratelimit_state.burst,
760 .maxlen = sizeof(int),
761 .mode = 0644,
762 .proc_handler = proc_dointvec,
763 },
764 {
765 .procname = "printk_delay",
766 .data = &printk_delay_msec,
767 .maxlen = sizeof(int),
768 .mode = 0644,
769 .proc_handler = proc_dointvec_minmax,
770 .extra1 = &zero,
771 .extra2 = &ten_thousand,
772 },
773 {
774 .procname = "dmesg_restrict",
775 .data = &dmesg_restrict,
776 .maxlen = sizeof(int),
777 .mode = 0644,
778 .proc_handler = proc_dointvec_minmax_sysadmin,
779 .extra1 = &zero,
780 .extra2 = &one,
781 },
782 {
783 .procname = "kptr_restrict",
784 .data = &kptr_restrict,
785 .maxlen = sizeof(int),
786 .mode = 0644,
787 .proc_handler = proc_dointvec_minmax_sysadmin,
788 .extra1 = &zero,
789 .extra2 = &two,
790 },
791 #endif
792 {
793 .procname = "ngroups_max",
794 .data = &ngroups_max,
795 .maxlen = sizeof (int),
796 .mode = 0444,
797 .proc_handler = proc_dointvec,
798 },
799 {
800 .procname = "cap_last_cap",
801 .data = (void *)&cap_last_cap,
802 .maxlen = sizeof(int),
803 .mode = 0444,
804 .proc_handler = proc_dointvec,
805 },
806 #if defined(CONFIG_LOCKUP_DETECTOR)
807 {
808 .procname = "watchdog",
809 .data = &watchdog_enabled,
810 .maxlen = sizeof (int),
811 .mode = 0644,
812 .proc_handler = proc_dowatchdog,
813 .extra1 = &zero,
814 .extra2 = &one,
815 },
816 {
817 .procname = "watchdog_thresh",
818 .data = &watchdog_thresh,
819 .maxlen = sizeof(int),
820 .mode = 0644,
821 .proc_handler = proc_dowatchdog,
822 .extra1 = &neg_one,
823 .extra2 = &sixty,
824 },
825 {
826 .procname = "softlockup_panic",
827 .data = &softlockup_panic,
828 .maxlen = sizeof(int),
829 .mode = 0644,
830 .proc_handler = proc_dointvec_minmax,
831 .extra1 = &zero,
832 .extra2 = &one,
833 },
834 {
835 .procname = "nmi_watchdog",
836 .data = &watchdog_enabled,
837 .maxlen = sizeof (int),
838 .mode = 0644,
839 .proc_handler = proc_dowatchdog,
840 .extra1 = &zero,
841 .extra2 = &one,
842 },
843 #endif
844 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
845 {
846 .procname = "unknown_nmi_panic",
847 .data = &unknown_nmi_panic,
848 .maxlen = sizeof (int),
849 .mode = 0644,
850 .proc_handler = proc_dointvec,
851 },
852 #endif
853 #if defined(CONFIG_X86)
854 {
855 .procname = "panic_on_unrecovered_nmi",
856 .data = &panic_on_unrecovered_nmi,
857 .maxlen = sizeof(int),
858 .mode = 0644,
859 .proc_handler = proc_dointvec,
860 },
861 {
862 .procname = "panic_on_io_nmi",
863 .data = &panic_on_io_nmi,
864 .maxlen = sizeof(int),
865 .mode = 0644,
866 .proc_handler = proc_dointvec,
867 },
868 #ifdef CONFIG_DEBUG_STACKOVERFLOW
869 {
870 .procname = "panic_on_stackoverflow",
871 .data = &sysctl_panic_on_stackoverflow,
872 .maxlen = sizeof(int),
873 .mode = 0644,
874 .proc_handler = proc_dointvec,
875 },
876 #endif
877 {
878 .procname = "bootloader_type",
879 .data = &bootloader_type,
880 .maxlen = sizeof (int),
881 .mode = 0444,
882 .proc_handler = proc_dointvec,
883 },
884 {
885 .procname = "bootloader_version",
886 .data = &bootloader_version,
887 .maxlen = sizeof (int),
888 .mode = 0444,
889 .proc_handler = proc_dointvec,
890 },
891 {
892 .procname = "kstack_depth_to_print",
893 .data = &kstack_depth_to_print,
894 .maxlen = sizeof(int),
895 .mode = 0644,
896 .proc_handler = proc_dointvec,
897 },
898 {
899 .procname = "io_delay_type",
900 .data = &io_delay_type,
901 .maxlen = sizeof(int),
902 .mode = 0644,
903 .proc_handler = proc_dointvec,
904 },
905 #endif
906 #if defined(CONFIG_MMU)
907 {
908 .procname = "randomize_va_space",
909 .data = &randomize_va_space,
910 .maxlen = sizeof(int),
911 .mode = 0644,
912 .proc_handler = proc_dointvec,
913 },
914 #endif
915 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
916 {
917 .procname = "spin_retry",
918 .data = &spin_retry,
919 .maxlen = sizeof (int),
920 .mode = 0644,
921 .proc_handler = proc_dointvec,
922 },
923 #endif
924 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
925 {
926 .procname = "acpi_video_flags",
927 .data = &acpi_realmode_flags,
928 .maxlen = sizeof (unsigned long),
929 .mode = 0644,
930 .proc_handler = proc_doulongvec_minmax,
931 },
932 #endif
933 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
934 {
935 .procname = "ignore-unaligned-usertrap",
936 .data = &no_unaligned_warning,
937 .maxlen = sizeof (int),
938 .mode = 0644,
939 .proc_handler = proc_dointvec,
940 },
941 #endif
942 #ifdef CONFIG_IA64
943 {
944 .procname = "unaligned-dump-stack",
945 .data = &unaligned_dump_stack,
946 .maxlen = sizeof (int),
947 .mode = 0644,
948 .proc_handler = proc_dointvec,
949 },
950 #endif
951 #ifdef CONFIG_DETECT_HUNG_TASK
952 {
953 .procname = "hung_task_panic",
954 .data = &sysctl_hung_task_panic,
955 .maxlen = sizeof(int),
956 .mode = 0644,
957 .proc_handler = proc_dointvec_minmax,
958 .extra1 = &zero,
959 .extra2 = &one,
960 },
961 {
962 .procname = "hung_task_check_count",
963 .data = &sysctl_hung_task_check_count,
964 .maxlen = sizeof(unsigned long),
965 .mode = 0644,
966 .proc_handler = proc_doulongvec_minmax,
967 },
968 {
969 .procname = "hung_task_timeout_secs",
970 .data = &sysctl_hung_task_timeout_secs,
971 .maxlen = sizeof(unsigned long),
972 .mode = 0644,
973 .proc_handler = proc_dohung_task_timeout_secs,
974 .extra2 = &hung_task_timeout_max,
975 },
976 {
977 .procname = "hung_task_warnings",
978 .data = &sysctl_hung_task_warnings,
979 .maxlen = sizeof(unsigned long),
980 .mode = 0644,
981 .proc_handler = proc_doulongvec_minmax,
982 },
983 #endif
984 #ifdef CONFIG_COMPAT
985 {
986 .procname = "compat-log",
987 .data = &compat_log,
988 .maxlen = sizeof (int),
989 .mode = 0644,
990 .proc_handler = proc_dointvec,
991 },
992 #endif
993 #ifdef CONFIG_RT_MUTEXES
994 {
995 .procname = "max_lock_depth",
996 .data = &max_lock_depth,
997 .maxlen = sizeof(int),
998 .mode = 0644,
999 .proc_handler = proc_dointvec,
1000 },
1001 #endif
1002 {
1003 .procname = "poweroff_cmd",
1004 .data = &poweroff_cmd,
1005 .maxlen = POWEROFF_CMD_PATH_LEN,
1006 .mode = 0644,
1007 .proc_handler = proc_dostring,
1008 },
1009 #ifdef CONFIG_KEYS
1010 {
1011 .procname = "keys",
1012 .mode = 0555,
1013 .child = key_sysctls,
1014 },
1015 #endif
1016 #ifdef CONFIG_RCU_TORTURE_TEST
1017 {
1018 .procname = "rcutorture_runnable",
1019 .data = &rcutorture_runnable,
1020 .maxlen = sizeof(int),
1021 .mode = 0644,
1022 .proc_handler = proc_dointvec,
1023 },
1024 #endif
1025 #ifdef CONFIG_PERF_EVENTS
1026 /*
1027 * User-space scripts rely on the existence of this file
1028 * as a feature check for perf_events being enabled.
1029 *
1030 * So it's an ABI, do not remove!
1031 */
1032 {
1033 .procname = "perf_event_paranoid",
1034 .data = &sysctl_perf_event_paranoid,
1035 .maxlen = sizeof(sysctl_perf_event_paranoid),
1036 .mode = 0644,
1037 .proc_handler = proc_dointvec,
1038 },
1039 {
1040 .procname = "perf_event_mlock_kb",
1041 .data = &sysctl_perf_event_mlock,
1042 .maxlen = sizeof(sysctl_perf_event_mlock),
1043 .mode = 0644,
1044 .proc_handler = proc_dointvec,
1045 },
1046 {
1047 .procname = "perf_event_max_sample_rate",
1048 .data = &sysctl_perf_event_sample_rate,
1049 .maxlen = sizeof(sysctl_perf_event_sample_rate),
1050 .mode = 0644,
1051 .proc_handler = perf_proc_update_handler,
1052 },
1053 #endif
1054 #ifdef CONFIG_KMEMCHECK
1055 {
1056 .procname = "kmemcheck",
1057 .data = &kmemcheck_enabled,
1058 .maxlen = sizeof(int),
1059 .mode = 0644,
1060 .proc_handler = proc_dointvec,
1061 },
1062 #endif
1063 #ifdef CONFIG_BLOCK
1064 {
1065 .procname = "blk_iopoll",
1066 .data = &blk_iopoll_enabled,
1067 .maxlen = sizeof(int),
1068 .mode = 0644,
1069 .proc_handler = proc_dointvec,
1070 },
1071 #endif
1072 { }
1073 };
1074
1075 static struct ctl_table vm_table[] = {
1076 {
1077 .procname = "overcommit_memory",
1078 .data = &sysctl_overcommit_memory,
1079 .maxlen = sizeof(sysctl_overcommit_memory),
1080 .mode = 0644,
1081 .proc_handler = proc_dointvec_minmax,
1082 .extra1 = &zero,
1083 .extra2 = &two,
1084 },
1085 {
1086 .procname = "panic_on_oom",
1087 .data = &sysctl_panic_on_oom,
1088 .maxlen = sizeof(sysctl_panic_on_oom),
1089 .mode = 0644,
1090 .proc_handler = proc_dointvec_minmax,
1091 .extra1 = &zero,
1092 .extra2 = &two,
1093 },
1094 {
1095 .procname = "oom_kill_allocating_task",
1096 .data = &sysctl_oom_kill_allocating_task,
1097 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
1098 .mode = 0644,
1099 .proc_handler = proc_dointvec,
1100 },
1101 {
1102 .procname = "oom_dump_tasks",
1103 .data = &sysctl_oom_dump_tasks,
1104 .maxlen = sizeof(sysctl_oom_dump_tasks),
1105 .mode = 0644,
1106 .proc_handler = proc_dointvec,
1107 },
1108 {
1109 .procname = "overcommit_ratio",
1110 .data = &sysctl_overcommit_ratio,
1111 .maxlen = sizeof(sysctl_overcommit_ratio),
1112 .mode = 0644,
1113 .proc_handler = proc_dointvec,
1114 },
1115 {
1116 .procname = "page-cluster",
1117 .data = &page_cluster,
1118 .maxlen = sizeof(int),
1119 .mode = 0644,
1120 .proc_handler = proc_dointvec_minmax,
1121 .extra1 = &zero,
1122 },
1123 {
1124 .procname = "dirty_background_ratio",
1125 .data = &dirty_background_ratio,
1126 .maxlen = sizeof(dirty_background_ratio),
1127 .mode = 0644,
1128 .proc_handler = dirty_background_ratio_handler,
1129 .extra1 = &zero,
1130 .extra2 = &one_hundred,
1131 },
1132 {
1133 .procname = "dirty_background_bytes",
1134 .data = &dirty_background_bytes,
1135 .maxlen = sizeof(dirty_background_bytes),
1136 .mode = 0644,
1137 .proc_handler = dirty_background_bytes_handler,
1138 .extra1 = &one_ul,
1139 },
1140 {
1141 .procname = "dirty_ratio",
1142 .data = &vm_dirty_ratio,
1143 .maxlen = sizeof(vm_dirty_ratio),
1144 .mode = 0644,
1145 .proc_handler = dirty_ratio_handler,
1146 .extra1 = &zero,
1147 .extra2 = &one_hundred,
1148 },
1149 {
1150 .procname = "dirty_bytes",
1151 .data = &vm_dirty_bytes,
1152 .maxlen = sizeof(vm_dirty_bytes),
1153 .mode = 0644,
1154 .proc_handler = dirty_bytes_handler,
1155 .extra1 = &dirty_bytes_min,
1156 },
1157 {
1158 .procname = "dirty_writeback_centisecs",
1159 .data = &dirty_writeback_interval,
1160 .maxlen = sizeof(dirty_writeback_interval),
1161 .mode = 0644,
1162 .proc_handler = dirty_writeback_centisecs_handler,
1163 },
1164 {
1165 .procname = "dirty_expire_centisecs",
1166 .data = &dirty_expire_interval,
1167 .maxlen = sizeof(dirty_expire_interval),
1168 .mode = 0644,
1169 .proc_handler = proc_dointvec_minmax,
1170 .extra1 = &zero,
1171 },
1172 {
1173 .procname = "nr_pdflush_threads",
1174 .mode = 0444 /* read-only */,
1175 .proc_handler = pdflush_proc_obsolete,
1176 },
1177 {
1178 .procname = "swappiness",
1179 .data = &vm_swappiness,
1180 .maxlen = sizeof(vm_swappiness),
1181 .mode = 0644,
1182 .proc_handler = proc_dointvec_minmax,
1183 .extra1 = &zero,
1184 .extra2 = &one_hundred,
1185 },
1186 #ifdef CONFIG_HUGETLB_PAGE
1187 {
1188 .procname = "nr_hugepages",
1189 .data = NULL,
1190 .maxlen = sizeof(unsigned long),
1191 .mode = 0644,
1192 .proc_handler = hugetlb_sysctl_handler,
1193 .extra1 = (void *)&hugetlb_zero,
1194 .extra2 = (void *)&hugetlb_infinity,
1195 },
1196 #ifdef CONFIG_NUMA
1197 {
1198 .procname = "nr_hugepages_mempolicy",
1199 .data = NULL,
1200 .maxlen = sizeof(unsigned long),
1201 .mode = 0644,
1202 .proc_handler = &hugetlb_mempolicy_sysctl_handler,
1203 .extra1 = (void *)&hugetlb_zero,
1204 .extra2 = (void *)&hugetlb_infinity,
1205 },
1206 #endif
1207 {
1208 .procname = "hugetlb_shm_group",
1209 .data = &sysctl_hugetlb_shm_group,
1210 .maxlen = sizeof(gid_t),
1211 .mode = 0644,
1212 .proc_handler = proc_dointvec,
1213 },
1214 {
1215 .procname = "hugepages_treat_as_movable",
1216 .data = &hugepages_treat_as_movable,
1217 .maxlen = sizeof(int),
1218 .mode = 0644,
1219 .proc_handler = hugetlb_treat_movable_handler,
1220 },
1221 {
1222 .procname = "nr_overcommit_hugepages",
1223 .data = NULL,
1224 .maxlen = sizeof(unsigned long),
1225 .mode = 0644,
1226 .proc_handler = hugetlb_overcommit_handler,
1227 .extra1 = (void *)&hugetlb_zero,
1228 .extra2 = (void *)&hugetlb_infinity,
1229 },
1230 #endif
1231 {
1232 .procname = "lowmem_reserve_ratio",
1233 .data = &sysctl_lowmem_reserve_ratio,
1234 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1235 .mode = 0644,
1236 .proc_handler = lowmem_reserve_ratio_sysctl_handler,
1237 },
1238 {
1239 .procname = "drop_caches",
1240 .data = &sysctl_drop_caches,
1241 .maxlen = sizeof(int),
1242 .mode = 0644,
1243 .proc_handler = drop_caches_sysctl_handler,
1244 .extra1 = &one,
1245 .extra2 = &three,
1246 },
1247 #ifdef CONFIG_COMPACTION
1248 {
1249 .procname = "compact_memory",
1250 .data = &sysctl_compact_memory,
1251 .maxlen = sizeof(int),
1252 .mode = 0200,
1253 .proc_handler = sysctl_compaction_handler,
1254 },
1255 {
1256 .procname = "extfrag_threshold",
1257 .data = &sysctl_extfrag_threshold,
1258 .maxlen = sizeof(int),
1259 .mode = 0644,
1260 .proc_handler = sysctl_extfrag_handler,
1261 .extra1 = &min_extfrag_threshold,
1262 .extra2 = &max_extfrag_threshold,
1263 },
1264
1265 #endif /* CONFIG_COMPACTION */
1266 {
1267 .procname = "min_free_kbytes",
1268 .data = &min_free_kbytes,
1269 .maxlen = sizeof(min_free_kbytes),
1270 .mode = 0644,
1271 .proc_handler = min_free_kbytes_sysctl_handler,
1272 .extra1 = &zero,
1273 },
1274 {
1275 .procname = "percpu_pagelist_fraction",
1276 .data = &percpu_pagelist_fraction,
1277 .maxlen = sizeof(percpu_pagelist_fraction),
1278 .mode = 0644,
1279 .proc_handler = percpu_pagelist_fraction_sysctl_handler,
1280 .extra1 = &min_percpu_pagelist_fract,
1281 },
1282 #ifdef CONFIG_MMU
1283 {
1284 .procname = "max_map_count",
1285 .data = &sysctl_max_map_count,
1286 .maxlen = sizeof(sysctl_max_map_count),
1287 .mode = 0644,
1288 .proc_handler = proc_dointvec_minmax,
1289 .extra1 = &zero,
1290 },
1291 #else
1292 {
1293 .procname = "nr_trim_pages",
1294 .data = &sysctl_nr_trim_pages,
1295 .maxlen = sizeof(sysctl_nr_trim_pages),
1296 .mode = 0644,
1297 .proc_handler = proc_dointvec_minmax,
1298 .extra1 = &zero,
1299 },
1300 #endif
1301 {
1302 .procname = "laptop_mode",
1303 .data = &laptop_mode,
1304 .maxlen = sizeof(laptop_mode),
1305 .mode = 0644,
1306 .proc_handler = proc_dointvec_jiffies,
1307 },
1308 {
1309 .procname = "block_dump",
1310 .data = &block_dump,
1311 .maxlen = sizeof(block_dump),
1312 .mode = 0644,
1313 .proc_handler = proc_dointvec,
1314 .extra1 = &zero,
1315 },
1316 {
1317 .procname = "vfs_cache_pressure",
1318 .data = &sysctl_vfs_cache_pressure,
1319 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1320 .mode = 0644,
1321 .proc_handler = proc_dointvec,
1322 .extra1 = &zero,
1323 },
1324 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1325 {
1326 .procname = "legacy_va_layout",
1327 .data = &sysctl_legacy_va_layout,
1328 .maxlen = sizeof(sysctl_legacy_va_layout),
1329 .mode = 0644,
1330 .proc_handler = proc_dointvec,
1331 .extra1 = &zero,
1332 },
1333 #endif
1334 #ifdef CONFIG_NUMA
1335 {
1336 .procname = "zone_reclaim_mode",
1337 .data = &zone_reclaim_mode,
1338 .maxlen = sizeof(zone_reclaim_mode),
1339 .mode = 0644,
1340 .proc_handler = proc_dointvec,
1341 .extra1 = &zero,
1342 },
1343 {
1344 .procname = "min_unmapped_ratio",
1345 .data = &sysctl_min_unmapped_ratio,
1346 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1347 .mode = 0644,
1348 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler,
1349 .extra1 = &zero,
1350 .extra2 = &one_hundred,
1351 },
1352 {
1353 .procname = "min_slab_ratio",
1354 .data = &sysctl_min_slab_ratio,
1355 .maxlen = sizeof(sysctl_min_slab_ratio),
1356 .mode = 0644,
1357 .proc_handler = sysctl_min_slab_ratio_sysctl_handler,
1358 .extra1 = &zero,
1359 .extra2 = &one_hundred,
1360 },
1361 #endif
1362 #ifdef CONFIG_SMP
1363 {
1364 .procname = "stat_interval",
1365 .data = &sysctl_stat_interval,
1366 .maxlen = sizeof(sysctl_stat_interval),
1367 .mode = 0644,
1368 .proc_handler = proc_dointvec_jiffies,
1369 },
1370 #endif
1371 #ifdef CONFIG_MMU
1372 {
1373 .procname = "mmap_min_addr",
1374 .data = &dac_mmap_min_addr,
1375 .maxlen = sizeof(unsigned long),
1376 .mode = 0644,
1377 .proc_handler = mmap_min_addr_handler,
1378 },
1379 #endif
1380 #ifdef CONFIG_NUMA
1381 {
1382 .procname = "numa_zonelist_order",
1383 .data = &numa_zonelist_order,
1384 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1385 .mode = 0644,
1386 .proc_handler = numa_zonelist_order_handler,
1387 },
1388 #endif
1389 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1390 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1391 {
1392 .procname = "vdso_enabled",
1393 .data = &vdso_enabled,
1394 .maxlen = sizeof(vdso_enabled),
1395 .mode = 0644,
1396 .proc_handler = proc_dointvec,
1397 .extra1 = &zero,
1398 },
1399 #endif
1400 #ifdef CONFIG_HIGHMEM
1401 {
1402 .procname = "highmem_is_dirtyable",
1403 .data = &vm_highmem_is_dirtyable,
1404 .maxlen = sizeof(vm_highmem_is_dirtyable),
1405 .mode = 0644,
1406 .proc_handler = proc_dointvec_minmax,
1407 .extra1 = &zero,
1408 .extra2 = &one,
1409 },
1410 #endif
1411 {
1412 .procname = "scan_unevictable_pages",
1413 .data = &scan_unevictable_pages,
1414 .maxlen = sizeof(scan_unevictable_pages),
1415 .mode = 0644,
1416 .proc_handler = scan_unevictable_handler,
1417 },
1418 #ifdef CONFIG_MEMORY_FAILURE
1419 {
1420 .procname = "memory_failure_early_kill",
1421 .data = &sysctl_memory_failure_early_kill,
1422 .maxlen = sizeof(sysctl_memory_failure_early_kill),
1423 .mode = 0644,
1424 .proc_handler = proc_dointvec_minmax,
1425 .extra1 = &zero,
1426 .extra2 = &one,
1427 },
1428 {
1429 .procname = "memory_failure_recovery",
1430 .data = &sysctl_memory_failure_recovery,
1431 .maxlen = sizeof(sysctl_memory_failure_recovery),
1432 .mode = 0644,
1433 .proc_handler = proc_dointvec_minmax,
1434 .extra1 = &zero,
1435 .extra2 = &one,
1436 },
1437 #endif
1438 {
1439 .procname = "user_reserve_kbytes",
1440 .data = &sysctl_user_reserve_kbytes,
1441 .maxlen = sizeof(sysctl_user_reserve_kbytes),
1442 .mode = 0644,
1443 .proc_handler = proc_doulongvec_minmax,
1444 },
1445 {
1446 .procname = "admin_reserve_kbytes",
1447 .data = &sysctl_admin_reserve_kbytes,
1448 .maxlen = sizeof(sysctl_admin_reserve_kbytes),
1449 .mode = 0644,
1450 .proc_handler = proc_doulongvec_minmax,
1451 },
1452 { }
1453 };
1454
1455 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1456 static struct ctl_table binfmt_misc_table[] = {
1457 { }
1458 };
1459 #endif
1460
1461 static struct ctl_table fs_table[] = {
1462 {
1463 .procname = "inode-nr",
1464 .data = &inodes_stat,
1465 .maxlen = 2*sizeof(int),
1466 .mode = 0444,
1467 .proc_handler = proc_nr_inodes,
1468 },
1469 {
1470 .procname = "inode-state",
1471 .data = &inodes_stat,
1472 .maxlen = 7*sizeof(int),
1473 .mode = 0444,
1474 .proc_handler = proc_nr_inodes,
1475 },
1476 {
1477 .procname = "file-nr",
1478 .data = &files_stat,
1479 .maxlen = sizeof(files_stat),
1480 .mode = 0444,
1481 .proc_handler = proc_nr_files,
1482 },
1483 {
1484 .procname = "file-max",
1485 .data = &files_stat.max_files,
1486 .maxlen = sizeof(files_stat.max_files),
1487 .mode = 0644,
1488 .proc_handler = proc_doulongvec_minmax,
1489 },
1490 {
1491 .procname = "nr_open",
1492 .data = &sysctl_nr_open,
1493 .maxlen = sizeof(int),
1494 .mode = 0644,
1495 .proc_handler = proc_dointvec_minmax,
1496 .extra1 = &sysctl_nr_open_min,
1497 .extra2 = &sysctl_nr_open_max,
1498 },
1499 {
1500 .procname = "dentry-state",
1501 .data = &dentry_stat,
1502 .maxlen = 6*sizeof(int),
1503 .mode = 0444,
1504 .proc_handler = proc_nr_dentry,
1505 },
1506 {
1507 .procname = "overflowuid",
1508 .data = &fs_overflowuid,
1509 .maxlen = sizeof(int),
1510 .mode = 0644,
1511 .proc_handler = proc_dointvec_minmax,
1512 .extra1 = &minolduid,
1513 .extra2 = &maxolduid,
1514 },
1515 {
1516 .procname = "overflowgid",
1517 .data = &fs_overflowgid,
1518 .maxlen = sizeof(int),
1519 .mode = 0644,
1520 .proc_handler = proc_dointvec_minmax,
1521 .extra1 = &minolduid,
1522 .extra2 = &maxolduid,
1523 },
1524 #ifdef CONFIG_FILE_LOCKING
1525 {
1526 .procname = "leases-enable",
1527 .data = &leases_enable,
1528 .maxlen = sizeof(int),
1529 .mode = 0644,
1530 .proc_handler = proc_dointvec,
1531 },
1532 #endif
1533 #ifdef CONFIG_DNOTIFY
1534 {
1535 .procname = "dir-notify-enable",
1536 .data = &dir_notify_enable,
1537 .maxlen = sizeof(int),
1538 .mode = 0644,
1539 .proc_handler = proc_dointvec,
1540 },
1541 #endif
1542 #ifdef CONFIG_MMU
1543 #ifdef CONFIG_FILE_LOCKING
1544 {
1545 .procname = "lease-break-time",
1546 .data = &lease_break_time,
1547 .maxlen = sizeof(int),
1548 .mode = 0644,
1549 .proc_handler = proc_dointvec,
1550 },
1551 #endif
1552 #ifdef CONFIG_AIO
1553 {
1554 .procname = "aio-nr",
1555 .data = &aio_nr,
1556 .maxlen = sizeof(aio_nr),
1557 .mode = 0444,
1558 .proc_handler = proc_doulongvec_minmax,
1559 },
1560 {
1561 .procname = "aio-max-nr",
1562 .data = &aio_max_nr,
1563 .maxlen = sizeof(aio_max_nr),
1564 .mode = 0644,
1565 .proc_handler = proc_doulongvec_minmax,
1566 },
1567 #endif /* CONFIG_AIO */
1568 #ifdef CONFIG_INOTIFY_USER
1569 {
1570 .procname = "inotify",
1571 .mode = 0555,
1572 .child = inotify_table,
1573 },
1574 #endif
1575 #ifdef CONFIG_EPOLL
1576 {
1577 .procname = "epoll",
1578 .mode = 0555,
1579 .child = epoll_table,
1580 },
1581 #endif
1582 #endif
1583 {
1584 .procname = "protected_symlinks",
1585 .data = &sysctl_protected_symlinks,
1586 .maxlen = sizeof(int),
1587 .mode = 0600,
1588 .proc_handler = proc_dointvec_minmax,
1589 .extra1 = &zero,
1590 .extra2 = &one,
1591 },
1592 {
1593 .procname = "protected_hardlinks",
1594 .data = &sysctl_protected_hardlinks,
1595 .maxlen = sizeof(int),
1596 .mode = 0600,
1597 .proc_handler = proc_dointvec_minmax,
1598 .extra1 = &zero,
1599 .extra2 = &one,
1600 },
1601 {
1602 .procname = "suid_dumpable",
1603 .data = &suid_dumpable,
1604 .maxlen = sizeof(int),
1605 .mode = 0644,
1606 .proc_handler = proc_dointvec_minmax_coredump,
1607 .extra1 = &zero,
1608 .extra2 = &two,
1609 },
1610 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1611 {
1612 .procname = "binfmt_misc",
1613 .mode = 0555,
1614 .child = binfmt_misc_table,
1615 },
1616 #endif
1617 {
1618 .procname = "pipe-max-size",
1619 .data = &pipe_max_size,
1620 .maxlen = sizeof(int),
1621 .mode = 0644,
1622 .proc_handler = &pipe_proc_fn,
1623 .extra1 = &pipe_min_size,
1624 },
1625 { }
1626 };
1627
1628 static struct ctl_table debug_table[] = {
1629 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
1630 {
1631 .procname = "exception-trace",
1632 .data = &show_unhandled_signals,
1633 .maxlen = sizeof(int),
1634 .mode = 0644,
1635 .proc_handler = proc_dointvec
1636 },
1637 #endif
1638 #if defined(CONFIG_OPTPROBES)
1639 {
1640 .procname = "kprobes-optimization",
1641 .data = &sysctl_kprobes_optimization,
1642 .maxlen = sizeof(int),
1643 .mode = 0644,
1644 .proc_handler = proc_kprobes_optimization_handler,
1645 .extra1 = &zero,
1646 .extra2 = &one,
1647 },
1648 #endif
1649 { }
1650 };
1651
1652 static struct ctl_table dev_table[] = {
1653 { }
1654 };
1655
1656 int __init sysctl_init(void)
1657 {
1658 struct ctl_table_header *hdr;
1659
1660 hdr = register_sysctl_table(sysctl_base_table);
1661 kmemleak_not_leak(hdr);
1662 return 0;
1663 }
1664
1665 #endif /* CONFIG_SYSCTL */
1666
1667 /*
1668 * /proc/sys support
1669 */
1670
1671 #ifdef CONFIG_PROC_SYSCTL
1672
1673 static int _proc_do_string(void* data, int maxlen, int write,
1674 void __user *buffer,
1675 size_t *lenp, loff_t *ppos)
1676 {
1677 size_t len;
1678 char __user *p;
1679 char c;
1680
1681 if (!data || !maxlen || !*lenp) {
1682 *lenp = 0;
1683 return 0;
1684 }
1685
1686 if (write) {
1687 len = 0;
1688 p = buffer;
1689 while (len < *lenp) {
1690 if (get_user(c, p++))
1691 return -EFAULT;
1692 if (c == 0 || c == '\n')
1693 break;
1694 len++;
1695 }
1696 if (len >= maxlen)
1697 len = maxlen-1;
1698 if(copy_from_user(data, buffer, len))
1699 return -EFAULT;
1700 ((char *) data)[len] = 0;
1701 *ppos += *lenp;
1702 } else {
1703 len = strlen(data);
1704 if (len > maxlen)
1705 len = maxlen;
1706
1707 if (*ppos > len) {
1708 *lenp = 0;
1709 return 0;
1710 }
1711
1712 data += *ppos;
1713 len -= *ppos;
1714
1715 if (len > *lenp)
1716 len = *lenp;
1717 if (len)
1718 if(copy_to_user(buffer, data, len))
1719 return -EFAULT;
1720 if (len < *lenp) {
1721 if(put_user('\n', ((char __user *) buffer) + len))
1722 return -EFAULT;
1723 len++;
1724 }
1725 *lenp = len;
1726 *ppos += len;
1727 }
1728 return 0;
1729 }
1730
1731 /**
1732 * proc_dostring - read a string sysctl
1733 * @table: the sysctl table
1734 * @write: %TRUE if this is a write to the sysctl file
1735 * @buffer: the user buffer
1736 * @lenp: the size of the user buffer
1737 * @ppos: file position
1738 *
1739 * Reads/writes a string from/to the user buffer. If the kernel
1740 * buffer provided is not large enough to hold the string, the
1741 * string is truncated. The copied string is %NULL-terminated.
1742 * If the string is being read by the user process, it is copied
1743 * and a newline '\n' is added. It is truncated if the buffer is
1744 * not large enough.
1745 *
1746 * Returns 0 on success.
1747 */
1748 int proc_dostring(struct ctl_table *table, int write,
1749 void __user *buffer, size_t *lenp, loff_t *ppos)
1750 {
1751 return _proc_do_string(table->data, table->maxlen, write,
1752 buffer, lenp, ppos);
1753 }
1754
1755 static size_t proc_skip_spaces(char **buf)
1756 {
1757 size_t ret;
1758 char *tmp = skip_spaces(*buf);
1759 ret = tmp - *buf;
1760 *buf = tmp;
1761 return ret;
1762 }
1763
1764 static void proc_skip_char(char **buf, size_t *size, const char v)
1765 {
1766 while (*size) {
1767 if (**buf != v)
1768 break;
1769 (*size)--;
1770 (*buf)++;
1771 }
1772 }
1773
1774 #define TMPBUFLEN 22
1775 /**
1776 * proc_get_long - reads an ASCII formatted integer from a user buffer
1777 *
1778 * @buf: a kernel buffer
1779 * @size: size of the kernel buffer
1780 * @val: this is where the number will be stored
1781 * @neg: set to %TRUE if number is negative
1782 * @perm_tr: a vector which contains the allowed trailers
1783 * @perm_tr_len: size of the perm_tr vector
1784 * @tr: pointer to store the trailer character
1785 *
1786 * In case of success %0 is returned and @buf and @size are updated with
1787 * the amount of bytes read. If @tr is non-NULL and a trailing
1788 * character exists (size is non-zero after returning from this
1789 * function), @tr is updated with the trailing character.
1790 */
1791 static int proc_get_long(char **buf, size_t *size,
1792 unsigned long *val, bool *neg,
1793 const char *perm_tr, unsigned perm_tr_len, char *tr)
1794 {
1795 int len;
1796 char *p, tmp[TMPBUFLEN];
1797
1798 if (!*size)
1799 return -EINVAL;
1800
1801 len = *size;
1802 if (len > TMPBUFLEN - 1)
1803 len = TMPBUFLEN - 1;
1804
1805 memcpy(tmp, *buf, len);
1806
1807 tmp[len] = 0;
1808 p = tmp;
1809 if (*p == '-' && *size > 1) {
1810 *neg = true;
1811 p++;
1812 } else
1813 *neg = false;
1814 if (!isdigit(*p))
1815 return -EINVAL;
1816
1817 *val = simple_strtoul(p, &p, 0);
1818
1819 len = p - tmp;
1820
1821 /* We don't know if the next char is whitespace thus we may accept
1822 * invalid integers (e.g. 1234...a) or two integers instead of one
1823 * (e.g. 123...1). So lets not allow such large numbers. */
1824 if (len == TMPBUFLEN - 1)
1825 return -EINVAL;
1826
1827 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
1828 return -EINVAL;
1829
1830 if (tr && (len < *size))
1831 *tr = *p;
1832
1833 *buf += len;
1834 *size -= len;
1835
1836 return 0;
1837 }
1838
1839 /**
1840 * proc_put_long - converts an integer to a decimal ASCII formatted string
1841 *
1842 * @buf: the user buffer
1843 * @size: the size of the user buffer
1844 * @val: the integer to be converted
1845 * @neg: sign of the number, %TRUE for negative
1846 *
1847 * In case of success %0 is returned and @buf and @size are updated with
1848 * the amount of bytes written.
1849 */
1850 static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
1851 bool neg)
1852 {
1853 int len;
1854 char tmp[TMPBUFLEN], *p = tmp;
1855
1856 sprintf(p, "%s%lu", neg ? "-" : "", val);
1857 len = strlen(tmp);
1858 if (len > *size)
1859 len = *size;
1860 if (copy_to_user(*buf, tmp, len))
1861 return -EFAULT;
1862 *size -= len;
1863 *buf += len;
1864 return 0;
1865 }
1866 #undef TMPBUFLEN
1867
1868 static int proc_put_char(void __user **buf, size_t *size, char c)
1869 {
1870 if (*size) {
1871 char __user **buffer = (char __user **)buf;
1872 if (put_user(c, *buffer))
1873 return -EFAULT;
1874 (*size)--, (*buffer)++;
1875 *buf = *buffer;
1876 }
1877 return 0;
1878 }
1879
1880 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
1881 int *valp,
1882 int write, void *data)
1883 {
1884 if (write) {
1885 *valp = *negp ? -*lvalp : *lvalp;
1886 } else {
1887 int val = *valp;
1888 if (val < 0) {
1889 *negp = true;
1890 *lvalp = (unsigned long)-val;
1891 } else {
1892 *negp = false;
1893 *lvalp = (unsigned long)val;
1894 }
1895 }
1896 return 0;
1897 }
1898
1899 static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
1900
1901 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
1902 int write, void __user *buffer,
1903 size_t *lenp, loff_t *ppos,
1904 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
1905 int write, void *data),
1906 void *data)
1907 {
1908 int *i, vleft, first = 1, err = 0;
1909 unsigned long page = 0;
1910 size_t left;
1911 char *kbuf;
1912
1913 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
1914 *lenp = 0;
1915 return 0;
1916 }
1917
1918 i = (int *) tbl_data;
1919 vleft = table->maxlen / sizeof(*i);
1920 left = *lenp;
1921
1922 if (!conv)
1923 conv = do_proc_dointvec_conv;
1924
1925 if (write) {
1926 if (left > PAGE_SIZE - 1)
1927 left = PAGE_SIZE - 1;
1928 page = __get_free_page(GFP_TEMPORARY);
1929 kbuf = (char *) page;
1930 if (!kbuf)
1931 return -ENOMEM;
1932 if (copy_from_user(kbuf, buffer, left)) {
1933 err = -EFAULT;
1934 goto free;
1935 }
1936 kbuf[left] = 0;
1937 }
1938
1939 for (; left && vleft--; i++, first=0) {
1940 unsigned long lval;
1941 bool neg;
1942
1943 if (write) {
1944 left -= proc_skip_spaces(&kbuf);
1945
1946 if (!left)
1947 break;
1948 err = proc_get_long(&kbuf, &left, &lval, &neg,
1949 proc_wspace_sep,
1950 sizeof(proc_wspace_sep), NULL);
1951 if (err)
1952 break;
1953 if (conv(&neg, &lval, i, 1, data)) {
1954 err = -EINVAL;
1955 break;
1956 }
1957 } else {
1958 if (conv(&neg, &lval, i, 0, data)) {
1959 err = -EINVAL;
1960 break;
1961 }
1962 if (!first)
1963 err = proc_put_char(&buffer, &left, '\t');
1964 if (err)
1965 break;
1966 err = proc_put_long(&buffer, &left, lval, neg);
1967 if (err)
1968 break;
1969 }
1970 }
1971
1972 if (!write && !first && left && !err)
1973 err = proc_put_char(&buffer, &left, '\n');
1974 if (write && !err && left)
1975 left -= proc_skip_spaces(&kbuf);
1976 free:
1977 if (write) {
1978 free_page(page);
1979 if (first)
1980 return err ? : -EINVAL;
1981 }
1982 *lenp -= left;
1983 *ppos += *lenp;
1984 return err;
1985 }
1986
1987 static int do_proc_dointvec(struct ctl_table *table, int write,
1988 void __user *buffer, size_t *lenp, loff_t *ppos,
1989 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
1990 int write, void *data),
1991 void *data)
1992 {
1993 return __do_proc_dointvec(table->data, table, write,
1994 buffer, lenp, ppos, conv, data);
1995 }
1996
1997 /**
1998 * proc_dointvec - read a vector of integers
1999 * @table: the sysctl table
2000 * @write: %TRUE if this is a write to the sysctl file
2001 * @buffer: the user buffer
2002 * @lenp: the size of the user buffer
2003 * @ppos: file position
2004 *
2005 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2006 * values from/to the user buffer, treated as an ASCII string.
2007 *
2008 * Returns 0 on success.
2009 */
2010 int proc_dointvec(struct ctl_table *table, int write,
2011 void __user *buffer, size_t *lenp, loff_t *ppos)
2012 {
2013 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2014 NULL,NULL);
2015 }
2016
2017 /*
2018 * Taint values can only be increased
2019 * This means we can safely use a temporary.
2020 */
2021 static int proc_taint(struct ctl_table *table, int write,
2022 void __user *buffer, size_t *lenp, loff_t *ppos)
2023 {
2024 struct ctl_table t;
2025 unsigned long tmptaint = get_taint();
2026 int err;
2027
2028 if (write && !capable(CAP_SYS_ADMIN))
2029 return -EPERM;
2030
2031 t = *table;
2032 t.data = &tmptaint;
2033 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
2034 if (err < 0)
2035 return err;
2036
2037 if (write) {
2038 /*
2039 * Poor man's atomic or. Not worth adding a primitive
2040 * to everyone's atomic.h for this
2041 */
2042 int i;
2043 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2044 if ((tmptaint >> i) & 1)
2045 add_taint(i, LOCKDEP_STILL_OK);
2046 }
2047 }
2048
2049 return err;
2050 }
2051
2052 #ifdef CONFIG_PRINTK
2053 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
2054 void __user *buffer, size_t *lenp, loff_t *ppos)
2055 {
2056 if (write && !capable(CAP_SYS_ADMIN))
2057 return -EPERM;
2058
2059 return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2060 }
2061 #endif
2062
2063 struct do_proc_dointvec_minmax_conv_param {
2064 int *min;
2065 int *max;
2066 };
2067
2068 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
2069 int *valp,
2070 int write, void *data)
2071 {
2072 struct do_proc_dointvec_minmax_conv_param *param = data;
2073 if (write) {
2074 int val = *negp ? -*lvalp : *lvalp;
2075 if ((param->min && *param->min > val) ||
2076 (param->max && *param->max < val))
2077 return -EINVAL;
2078 *valp = val;
2079 } else {
2080 int val = *valp;
2081 if (val < 0) {
2082 *negp = true;
2083 *lvalp = (unsigned long)-val;
2084 } else {
2085 *negp = false;
2086 *lvalp = (unsigned long)val;
2087 }
2088 }
2089 return 0;
2090 }
2091
2092 /**
2093 * proc_dointvec_minmax - read a vector of integers with min/max values
2094 * @table: the sysctl table
2095 * @write: %TRUE if this is a write to the sysctl file
2096 * @buffer: the user buffer
2097 * @lenp: the size of the user buffer
2098 * @ppos: file position
2099 *
2100 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2101 * values from/to the user buffer, treated as an ASCII string.
2102 *
2103 * This routine will ensure the values are within the range specified by
2104 * table->extra1 (min) and table->extra2 (max).
2105 *
2106 * Returns 0 on success.
2107 */
2108 int proc_dointvec_minmax(struct ctl_table *table, int write,
2109 void __user *buffer, size_t *lenp, loff_t *ppos)
2110 {
2111 struct do_proc_dointvec_minmax_conv_param param = {
2112 .min = (int *) table->extra1,
2113 .max = (int *) table->extra2,
2114 };
2115 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2116 do_proc_dointvec_minmax_conv, &param);
2117 }
2118
2119 static void validate_coredump_safety(void)
2120 {
2121 #ifdef CONFIG_COREDUMP
2122 if (suid_dumpable == SUID_DUMP_ROOT &&
2123 core_pattern[0] != '/' && core_pattern[0] != '|') {
2124 printk(KERN_WARNING "Unsafe core_pattern used with "\
2125 "suid_dumpable=2. Pipe handler or fully qualified "\
2126 "core dump path required.\n");
2127 }
2128 #endif
2129 }
2130
2131 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
2132 void __user *buffer, size_t *lenp, loff_t *ppos)
2133 {
2134 int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2135 if (!error)
2136 validate_coredump_safety();
2137 return error;
2138 }
2139
2140 #ifdef CONFIG_COREDUMP
2141 static int proc_dostring_coredump(struct ctl_table *table, int write,
2142 void __user *buffer, size_t *lenp, loff_t *ppos)
2143 {
2144 int error = proc_dostring(table, write, buffer, lenp, ppos);
2145 if (!error)
2146 validate_coredump_safety();
2147 return error;
2148 }
2149 #endif
2150
2151 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2152 void __user *buffer,
2153 size_t *lenp, loff_t *ppos,
2154 unsigned long convmul,
2155 unsigned long convdiv)
2156 {
2157 unsigned long *i, *min, *max;
2158 int vleft, first = 1, err = 0;
2159 unsigned long page = 0;
2160 size_t left;
2161 char *kbuf;
2162
2163 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
2164 *lenp = 0;
2165 return 0;
2166 }
2167
2168 i = (unsigned long *) data;
2169 min = (unsigned long *) table->extra1;
2170 max = (unsigned long *) table->extra2;
2171 vleft = table->maxlen / sizeof(unsigned long);
2172 left = *lenp;
2173
2174 if (write) {
2175 if (left > PAGE_SIZE - 1)
2176 left = PAGE_SIZE - 1;
2177 page = __get_free_page(GFP_TEMPORARY);
2178 kbuf = (char *) page;
2179 if (!kbuf)
2180 return -ENOMEM;
2181 if (copy_from_user(kbuf, buffer, left)) {
2182 err = -EFAULT;
2183 goto free;
2184 }
2185 kbuf[left] = 0;
2186 }
2187
2188 for (; left && vleft--; i++, first = 0) {
2189 unsigned long val;
2190
2191 if (write) {
2192 bool neg;
2193
2194 left -= proc_skip_spaces(&kbuf);
2195
2196 err = proc_get_long(&kbuf, &left, &val, &neg,
2197 proc_wspace_sep,
2198 sizeof(proc_wspace_sep), NULL);
2199 if (err)
2200 break;
2201 if (neg)
2202 continue;
2203 if ((min && val < *min) || (max && val > *max))
2204 continue;
2205 *i = val;
2206 } else {
2207 val = convdiv * (*i) / convmul;
2208 if (!first)
2209 err = proc_put_char(&buffer, &left, '\t');
2210 err = proc_put_long(&buffer, &left, val, false);
2211 if (err)
2212 break;
2213 }
2214 }
2215
2216 if (!write && !first && left && !err)
2217 err = proc_put_char(&buffer, &left, '\n');
2218 if (write && !err)
2219 left -= proc_skip_spaces(&kbuf);
2220 free:
2221 if (write) {
2222 free_page(page);
2223 if (first)
2224 return err ? : -EINVAL;
2225 }
2226 *lenp -= left;
2227 *ppos += *lenp;
2228 return err;
2229 }
2230
2231 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2232 void __user *buffer,
2233 size_t *lenp, loff_t *ppos,
2234 unsigned long convmul,
2235 unsigned long convdiv)
2236 {
2237 return __do_proc_doulongvec_minmax(table->data, table, write,
2238 buffer, lenp, ppos, convmul, convdiv);
2239 }
2240
2241 /**
2242 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2243 * @table: the sysctl table
2244 * @write: %TRUE if this is a write to the sysctl file
2245 * @buffer: the user buffer
2246 * @lenp: the size of the user buffer
2247 * @ppos: file position
2248 *
2249 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2250 * values from/to the user buffer, treated as an ASCII string.
2251 *
2252 * This routine will ensure the values are within the range specified by
2253 * table->extra1 (min) and table->extra2 (max).
2254 *
2255 * Returns 0 on success.
2256 */
2257 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2258 void __user *buffer, size_t *lenp, loff_t *ppos)
2259 {
2260 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
2261 }
2262
2263 /**
2264 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2265 * @table: the sysctl table
2266 * @write: %TRUE if this is a write to the sysctl file
2267 * @buffer: the user buffer
2268 * @lenp: the size of the user buffer
2269 * @ppos: file position
2270 *
2271 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2272 * values from/to the user buffer, treated as an ASCII string. The values
2273 * are treated as milliseconds, and converted to jiffies when they are stored.
2274 *
2275 * This routine will ensure the values are within the range specified by
2276 * table->extra1 (min) and table->extra2 (max).
2277 *
2278 * Returns 0 on success.
2279 */
2280 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2281 void __user *buffer,
2282 size_t *lenp, loff_t *ppos)
2283 {
2284 return do_proc_doulongvec_minmax(table, write, buffer,
2285 lenp, ppos, HZ, 1000l);
2286 }
2287
2288
2289 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
2290 int *valp,
2291 int write, void *data)
2292 {
2293 if (write) {
2294 if (*lvalp > LONG_MAX / HZ)
2295 return 1;
2296 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2297 } else {
2298 int val = *valp;
2299 unsigned long lval;
2300 if (val < 0) {
2301 *negp = true;
2302 lval = (unsigned long)-val;
2303 } else {
2304 *negp = false;
2305 lval = (unsigned long)val;
2306 }
2307 *lvalp = lval / HZ;
2308 }
2309 return 0;
2310 }
2311
2312 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
2313 int *valp,
2314 int write, void *data)
2315 {
2316 if (write) {
2317 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2318 return 1;
2319 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2320 } else {
2321 int val = *valp;
2322 unsigned long lval;
2323 if (val < 0) {
2324 *negp = true;
2325 lval = (unsigned long)-val;
2326 } else {
2327 *negp = false;
2328 lval = (unsigned long)val;
2329 }
2330 *lvalp = jiffies_to_clock_t(lval);
2331 }
2332 return 0;
2333 }
2334
2335 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
2336 int *valp,
2337 int write, void *data)
2338 {
2339 if (write) {
2340 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2341 } else {
2342 int val = *valp;
2343 unsigned long lval;
2344 if (val < 0) {
2345 *negp = true;
2346 lval = (unsigned long)-val;
2347 } else {
2348 *negp = false;
2349 lval = (unsigned long)val;
2350 }
2351 *lvalp = jiffies_to_msecs(lval);
2352 }
2353 return 0;
2354 }
2355
2356 /**
2357 * proc_dointvec_jiffies - read a vector of integers as seconds
2358 * @table: the sysctl table
2359 * @write: %TRUE if this is a write to the sysctl file
2360 * @buffer: the user buffer
2361 * @lenp: the size of the user buffer
2362 * @ppos: file position
2363 *
2364 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2365 * values from/to the user buffer, treated as an ASCII string.
2366 * The values read are assumed to be in seconds, and are converted into
2367 * jiffies.
2368 *
2369 * Returns 0 on success.
2370 */
2371 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2372 void __user *buffer, size_t *lenp, loff_t *ppos)
2373 {
2374 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2375 do_proc_dointvec_jiffies_conv,NULL);
2376 }
2377
2378 /**
2379 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2380 * @table: the sysctl table
2381 * @write: %TRUE if this is a write to the sysctl file
2382 * @buffer: the user buffer
2383 * @lenp: the size of the user buffer
2384 * @ppos: pointer to the file position
2385 *
2386 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2387 * values from/to the user buffer, treated as an ASCII string.
2388 * The values read are assumed to be in 1/USER_HZ seconds, and
2389 * are converted into jiffies.
2390 *
2391 * Returns 0 on success.
2392 */
2393 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2394 void __user *buffer, size_t *lenp, loff_t *ppos)
2395 {
2396 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2397 do_proc_dointvec_userhz_jiffies_conv,NULL);
2398 }
2399
2400 /**
2401 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2402 * @table: the sysctl table
2403 * @write: %TRUE if this is a write to the sysctl file
2404 * @buffer: the user buffer
2405 * @lenp: the size of the user buffer
2406 * @ppos: file position
2407 * @ppos: the current position in the file
2408 *
2409 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2410 * values from/to the user buffer, treated as an ASCII string.
2411 * The values read are assumed to be in 1/1000 seconds, and
2412 * are converted into jiffies.
2413 *
2414 * Returns 0 on success.
2415 */
2416 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2417 void __user *buffer, size_t *lenp, loff_t *ppos)
2418 {
2419 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2420 do_proc_dointvec_ms_jiffies_conv, NULL);
2421 }
2422
2423 static int proc_do_cad_pid(struct ctl_table *table, int write,
2424 void __user *buffer, size_t *lenp, loff_t *ppos)
2425 {
2426 struct pid *new_pid;
2427 pid_t tmp;
2428 int r;
2429
2430 tmp = pid_vnr(cad_pid);
2431
2432 r = __do_proc_dointvec(&tmp, table, write, buffer,
2433 lenp, ppos, NULL, NULL);
2434 if (r || !write)
2435 return r;
2436
2437 new_pid = find_get_pid(tmp);
2438 if (!new_pid)
2439 return -ESRCH;
2440
2441 put_pid(xchg(&cad_pid, new_pid));
2442 return 0;
2443 }
2444
2445 /**
2446 * proc_do_large_bitmap - read/write from/to a large bitmap
2447 * @table: the sysctl table
2448 * @write: %TRUE if this is a write to the sysctl file
2449 * @buffer: the user buffer
2450 * @lenp: the size of the user buffer
2451 * @ppos: file position
2452 *
2453 * The bitmap is stored at table->data and the bitmap length (in bits)
2454 * in table->maxlen.
2455 *
2456 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2457 * large bitmaps may be represented in a compact manner. Writing into
2458 * the file will clear the bitmap then update it with the given input.
2459 *
2460 * Returns 0 on success.
2461 */
2462 int proc_do_large_bitmap(struct ctl_table *table, int write,
2463 void __user *buffer, size_t *lenp, loff_t *ppos)
2464 {
2465 int err = 0;
2466 bool first = 1;
2467 size_t left = *lenp;
2468 unsigned long bitmap_len = table->maxlen;
2469 unsigned long *bitmap = (unsigned long *) table->data;
2470 unsigned long *tmp_bitmap = NULL;
2471 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
2472
2473 if (!bitmap_len || !left || (*ppos && !write)) {
2474 *lenp = 0;
2475 return 0;
2476 }
2477
2478 if (write) {
2479 unsigned long page = 0;
2480 char *kbuf;
2481
2482 if (left > PAGE_SIZE - 1)
2483 left = PAGE_SIZE - 1;
2484
2485 page = __get_free_page(GFP_TEMPORARY);
2486 kbuf = (char *) page;
2487 if (!kbuf)
2488 return -ENOMEM;
2489 if (copy_from_user(kbuf, buffer, left)) {
2490 free_page(page);
2491 return -EFAULT;
2492 }
2493 kbuf[left] = 0;
2494
2495 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long),
2496 GFP_KERNEL);
2497 if (!tmp_bitmap) {
2498 free_page(page);
2499 return -ENOMEM;
2500 }
2501 proc_skip_char(&kbuf, &left, '\n');
2502 while (!err && left) {
2503 unsigned long val_a, val_b;
2504 bool neg;
2505
2506 err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a,
2507 sizeof(tr_a), &c);
2508 if (err)
2509 break;
2510 if (val_a >= bitmap_len || neg) {
2511 err = -EINVAL;
2512 break;
2513 }
2514
2515 val_b = val_a;
2516 if (left) {
2517 kbuf++;
2518 left--;
2519 }
2520
2521 if (c == '-') {
2522 err = proc_get_long(&kbuf, &left, &val_b,
2523 &neg, tr_b, sizeof(tr_b),
2524 &c);
2525 if (err)
2526 break;
2527 if (val_b >= bitmap_len || neg ||
2528 val_a > val_b) {
2529 err = -EINVAL;
2530 break;
2531 }
2532 if (left) {
2533 kbuf++;
2534 left--;
2535 }
2536 }
2537
2538 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
2539 first = 0;
2540 proc_skip_char(&kbuf, &left, '\n');
2541 }
2542 free_page(page);
2543 } else {
2544 unsigned long bit_a, bit_b = 0;
2545
2546 while (left) {
2547 bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
2548 if (bit_a >= bitmap_len)
2549 break;
2550 bit_b = find_next_zero_bit(bitmap, bitmap_len,
2551 bit_a + 1) - 1;
2552
2553 if (!first) {
2554 err = proc_put_char(&buffer, &left, ',');
2555 if (err)
2556 break;
2557 }
2558 err = proc_put_long(&buffer, &left, bit_a, false);
2559 if (err)
2560 break;
2561 if (bit_a != bit_b) {
2562 err = proc_put_char(&buffer, &left, '-');
2563 if (err)
2564 break;
2565 err = proc_put_long(&buffer, &left, bit_b, false);
2566 if (err)
2567 break;
2568 }
2569
2570 first = 0; bit_b++;
2571 }
2572 if (!err)
2573 err = proc_put_char(&buffer, &left, '\n');
2574 }
2575
2576 if (!err) {
2577 if (write) {
2578 if (*ppos)
2579 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
2580 else
2581 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
2582 }
2583 kfree(tmp_bitmap);
2584 *lenp -= left;
2585 *ppos += *lenp;
2586 return 0;
2587 } else {
2588 kfree(tmp_bitmap);
2589 return err;
2590 }
2591 }
2592
2593 #else /* CONFIG_PROC_SYSCTL */
2594
2595 int proc_dostring(struct ctl_table *table, int write,
2596 void __user *buffer, size_t *lenp, loff_t *ppos)
2597 {
2598 return -ENOSYS;
2599 }
2600
2601 int proc_dointvec(struct ctl_table *table, int write,
2602 void __user *buffer, size_t *lenp, loff_t *ppos)
2603 {
2604 return -ENOSYS;
2605 }
2606
2607 int proc_dointvec_minmax(struct ctl_table *table, int write,
2608 void __user *buffer, size_t *lenp, loff_t *ppos)
2609 {
2610 return -ENOSYS;
2611 }
2612
2613 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2614 void __user *buffer, size_t *lenp, loff_t *ppos)
2615 {
2616 return -ENOSYS;
2617 }
2618
2619 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2620 void __user *buffer, size_t *lenp, loff_t *ppos)
2621 {
2622 return -ENOSYS;
2623 }
2624
2625 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2626 void __user *buffer, size_t *lenp, loff_t *ppos)
2627 {
2628 return -ENOSYS;
2629 }
2630
2631 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2632 void __user *buffer, size_t *lenp, loff_t *ppos)
2633 {
2634 return -ENOSYS;
2635 }
2636
2637 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2638 void __user *buffer,
2639 size_t *lenp, loff_t *ppos)
2640 {
2641 return -ENOSYS;
2642 }
2643
2644
2645 #endif /* CONFIG_PROC_SYSCTL */
2646
2647 /*
2648 * No sense putting this after each symbol definition, twice,
2649 * exception granted :-)
2650 */
2651 EXPORT_SYMBOL(proc_dointvec);
2652 EXPORT_SYMBOL(proc_dointvec_jiffies);
2653 EXPORT_SYMBOL(proc_dointvec_minmax);
2654 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2655 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2656 EXPORT_SYMBOL(proc_dostring);
2657 EXPORT_SYMBOL(proc_doulongvec_minmax);
2658 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
kernel source for telekom puls (alcatel/mediatek)