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padata: avoid race in reordering
[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 .extra1 = &one,
1053 },
1054 {
1055 .procname = "perf_cpu_time_max_percent",
1056 .data = &sysctl_perf_cpu_time_max_percent,
1057 .maxlen = sizeof(sysctl_perf_cpu_time_max_percent),
1058 .mode = 0644,
1059 .proc_handler = perf_cpu_time_max_percent_handler,
1060 .extra1 = &zero,
1061 .extra2 = &one_hundred,
1062 },
1063 #endif
1064 #ifdef CONFIG_KMEMCHECK
1065 {
1066 .procname = "kmemcheck",
1067 .data = &kmemcheck_enabled,
1068 .maxlen = sizeof(int),
1069 .mode = 0644,
1070 .proc_handler = proc_dointvec,
1071 },
1072 #endif
1073 #ifdef CONFIG_BLOCK
1074 {
1075 .procname = "blk_iopoll",
1076 .data = &blk_iopoll_enabled,
1077 .maxlen = sizeof(int),
1078 .mode = 0644,
1079 .proc_handler = proc_dointvec,
1080 },
1081 #endif
1082 { }
1083 };
1084
1085 static struct ctl_table vm_table[] = {
1086 {
1087 .procname = "overcommit_memory",
1088 .data = &sysctl_overcommit_memory,
1089 .maxlen = sizeof(sysctl_overcommit_memory),
1090 .mode = 0644,
1091 .proc_handler = proc_dointvec_minmax,
1092 .extra1 = &zero,
1093 .extra2 = &two,
1094 },
1095 {
1096 .procname = "panic_on_oom",
1097 .data = &sysctl_panic_on_oom,
1098 .maxlen = sizeof(sysctl_panic_on_oom),
1099 .mode = 0644,
1100 .proc_handler = proc_dointvec_minmax,
1101 .extra1 = &zero,
1102 .extra2 = &two,
1103 },
1104 {
1105 .procname = "oom_kill_allocating_task",
1106 .data = &sysctl_oom_kill_allocating_task,
1107 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
1108 .mode = 0644,
1109 .proc_handler = proc_dointvec,
1110 },
1111 {
1112 .procname = "oom_dump_tasks",
1113 .data = &sysctl_oom_dump_tasks,
1114 .maxlen = sizeof(sysctl_oom_dump_tasks),
1115 .mode = 0644,
1116 .proc_handler = proc_dointvec,
1117 },
1118 {
1119 .procname = "overcommit_ratio",
1120 .data = &sysctl_overcommit_ratio,
1121 .maxlen = sizeof(sysctl_overcommit_ratio),
1122 .mode = 0644,
1123 .proc_handler = proc_dointvec,
1124 },
1125 {
1126 .procname = "page-cluster",
1127 .data = &page_cluster,
1128 .maxlen = sizeof(int),
1129 .mode = 0644,
1130 .proc_handler = proc_dointvec_minmax,
1131 .extra1 = &zero,
1132 },
1133 {
1134 .procname = "dirty_background_ratio",
1135 .data = &dirty_background_ratio,
1136 .maxlen = sizeof(dirty_background_ratio),
1137 .mode = 0644,
1138 .proc_handler = dirty_background_ratio_handler,
1139 .extra1 = &zero,
1140 .extra2 = &one_hundred,
1141 },
1142 {
1143 .procname = "dirty_background_bytes",
1144 .data = &dirty_background_bytes,
1145 .maxlen = sizeof(dirty_background_bytes),
1146 .mode = 0644,
1147 .proc_handler = dirty_background_bytes_handler,
1148 .extra1 = &one_ul,
1149 },
1150 {
1151 .procname = "dirty_ratio",
1152 .data = &vm_dirty_ratio,
1153 .maxlen = sizeof(vm_dirty_ratio),
1154 .mode = 0644,
1155 .proc_handler = dirty_ratio_handler,
1156 .extra1 = &zero,
1157 .extra2 = &one_hundred,
1158 },
1159 {
1160 .procname = "dirty_bytes",
1161 .data = &vm_dirty_bytes,
1162 .maxlen = sizeof(vm_dirty_bytes),
1163 .mode = 0644,
1164 .proc_handler = dirty_bytes_handler,
1165 .extra1 = &dirty_bytes_min,
1166 },
1167 {
1168 .procname = "dirty_writeback_centisecs",
1169 .data = &dirty_writeback_interval,
1170 .maxlen = sizeof(dirty_writeback_interval),
1171 .mode = 0644,
1172 .proc_handler = dirty_writeback_centisecs_handler,
1173 },
1174 {
1175 .procname = "dirty_expire_centisecs",
1176 .data = &dirty_expire_interval,
1177 .maxlen = sizeof(dirty_expire_interval),
1178 .mode = 0644,
1179 .proc_handler = proc_dointvec_minmax,
1180 .extra1 = &zero,
1181 },
1182 {
1183 .procname = "nr_pdflush_threads",
1184 .mode = 0444 /* read-only */,
1185 .proc_handler = pdflush_proc_obsolete,
1186 },
1187 {
1188 .procname = "swappiness",
1189 .data = &vm_swappiness,
1190 .maxlen = sizeof(vm_swappiness),
1191 .mode = 0644,
1192 .proc_handler = proc_dointvec_minmax,
1193 .extra1 = &zero,
1194 .extra2 = &one_hundred,
1195 },
1196 #ifdef CONFIG_HUGETLB_PAGE
1197 {
1198 .procname = "nr_hugepages",
1199 .data = NULL,
1200 .maxlen = sizeof(unsigned long),
1201 .mode = 0644,
1202 .proc_handler = hugetlb_sysctl_handler,
1203 .extra1 = (void *)&hugetlb_zero,
1204 .extra2 = (void *)&hugetlb_infinity,
1205 },
1206 #ifdef CONFIG_NUMA
1207 {
1208 .procname = "nr_hugepages_mempolicy",
1209 .data = NULL,
1210 .maxlen = sizeof(unsigned long),
1211 .mode = 0644,
1212 .proc_handler = &hugetlb_mempolicy_sysctl_handler,
1213 .extra1 = (void *)&hugetlb_zero,
1214 .extra2 = (void *)&hugetlb_infinity,
1215 },
1216 #endif
1217 {
1218 .procname = "hugetlb_shm_group",
1219 .data = &sysctl_hugetlb_shm_group,
1220 .maxlen = sizeof(gid_t),
1221 .mode = 0644,
1222 .proc_handler = proc_dointvec,
1223 },
1224 {
1225 .procname = "hugepages_treat_as_movable",
1226 .data = &hugepages_treat_as_movable,
1227 .maxlen = sizeof(int),
1228 .mode = 0644,
1229 .proc_handler = hugetlb_treat_movable_handler,
1230 },
1231 {
1232 .procname = "nr_overcommit_hugepages",
1233 .data = NULL,
1234 .maxlen = sizeof(unsigned long),
1235 .mode = 0644,
1236 .proc_handler = hugetlb_overcommit_handler,
1237 .extra1 = (void *)&hugetlb_zero,
1238 .extra2 = (void *)&hugetlb_infinity,
1239 },
1240 #endif
1241 {
1242 .procname = "lowmem_reserve_ratio",
1243 .data = &sysctl_lowmem_reserve_ratio,
1244 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1245 .mode = 0644,
1246 .proc_handler = lowmem_reserve_ratio_sysctl_handler,
1247 },
1248 {
1249 .procname = "drop_caches",
1250 .data = &sysctl_drop_caches,
1251 .maxlen = sizeof(int),
1252 .mode = 0644,
1253 .proc_handler = drop_caches_sysctl_handler,
1254 .extra1 = &one,
1255 .extra2 = &three,
1256 },
1257 #ifdef CONFIG_COMPACTION
1258 {
1259 .procname = "compact_memory",
1260 .data = &sysctl_compact_memory,
1261 .maxlen = sizeof(int),
1262 .mode = 0200,
1263 .proc_handler = sysctl_compaction_handler,
1264 },
1265 {
1266 .procname = "extfrag_threshold",
1267 .data = &sysctl_extfrag_threshold,
1268 .maxlen = sizeof(int),
1269 .mode = 0644,
1270 .proc_handler = sysctl_extfrag_handler,
1271 .extra1 = &min_extfrag_threshold,
1272 .extra2 = &max_extfrag_threshold,
1273 },
1274
1275 #endif /* CONFIG_COMPACTION */
1276 {
1277 .procname = "min_free_kbytes",
1278 .data = &min_free_kbytes,
1279 .maxlen = sizeof(min_free_kbytes),
1280 .mode = 0644,
1281 .proc_handler = min_free_kbytes_sysctl_handler,
1282 .extra1 = &zero,
1283 },
1284 {
1285 .procname = "percpu_pagelist_fraction",
1286 .data = &percpu_pagelist_fraction,
1287 .maxlen = sizeof(percpu_pagelist_fraction),
1288 .mode = 0644,
1289 .proc_handler = percpu_pagelist_fraction_sysctl_handler,
1290 .extra1 = &min_percpu_pagelist_fract,
1291 },
1292 #ifdef CONFIG_MMU
1293 {
1294 .procname = "max_map_count",
1295 .data = &sysctl_max_map_count,
1296 .maxlen = sizeof(sysctl_max_map_count),
1297 .mode = 0644,
1298 .proc_handler = proc_dointvec_minmax,
1299 .extra1 = &zero,
1300 },
1301 #else
1302 {
1303 .procname = "nr_trim_pages",
1304 .data = &sysctl_nr_trim_pages,
1305 .maxlen = sizeof(sysctl_nr_trim_pages),
1306 .mode = 0644,
1307 .proc_handler = proc_dointvec_minmax,
1308 .extra1 = &zero,
1309 },
1310 #endif
1311 {
1312 .procname = "laptop_mode",
1313 .data = &laptop_mode,
1314 .maxlen = sizeof(laptop_mode),
1315 .mode = 0644,
1316 .proc_handler = proc_dointvec_jiffies,
1317 },
1318 {
1319 .procname = "block_dump",
1320 .data = &block_dump,
1321 .maxlen = sizeof(block_dump),
1322 .mode = 0644,
1323 .proc_handler = proc_dointvec,
1324 .extra1 = &zero,
1325 },
1326 {
1327 .procname = "vfs_cache_pressure",
1328 .data = &sysctl_vfs_cache_pressure,
1329 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1330 .mode = 0644,
1331 .proc_handler = proc_dointvec,
1332 .extra1 = &zero,
1333 },
1334 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1335 {
1336 .procname = "legacy_va_layout",
1337 .data = &sysctl_legacy_va_layout,
1338 .maxlen = sizeof(sysctl_legacy_va_layout),
1339 .mode = 0644,
1340 .proc_handler = proc_dointvec,
1341 .extra1 = &zero,
1342 },
1343 #endif
1344 #ifdef CONFIG_NUMA
1345 {
1346 .procname = "zone_reclaim_mode",
1347 .data = &zone_reclaim_mode,
1348 .maxlen = sizeof(zone_reclaim_mode),
1349 .mode = 0644,
1350 .proc_handler = proc_dointvec,
1351 .extra1 = &zero,
1352 },
1353 {
1354 .procname = "min_unmapped_ratio",
1355 .data = &sysctl_min_unmapped_ratio,
1356 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1357 .mode = 0644,
1358 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler,
1359 .extra1 = &zero,
1360 .extra2 = &one_hundred,
1361 },
1362 {
1363 .procname = "min_slab_ratio",
1364 .data = &sysctl_min_slab_ratio,
1365 .maxlen = sizeof(sysctl_min_slab_ratio),
1366 .mode = 0644,
1367 .proc_handler = sysctl_min_slab_ratio_sysctl_handler,
1368 .extra1 = &zero,
1369 .extra2 = &one_hundred,
1370 },
1371 #endif
1372 #ifdef CONFIG_SMP
1373 {
1374 .procname = "stat_interval",
1375 .data = &sysctl_stat_interval,
1376 .maxlen = sizeof(sysctl_stat_interval),
1377 .mode = 0644,
1378 .proc_handler = proc_dointvec_jiffies,
1379 },
1380 #endif
1381 #ifdef CONFIG_MMU
1382 {
1383 .procname = "mmap_min_addr",
1384 .data = &dac_mmap_min_addr,
1385 .maxlen = sizeof(unsigned long),
1386 .mode = 0644,
1387 .proc_handler = mmap_min_addr_handler,
1388 },
1389 #endif
1390 #ifdef CONFIG_NUMA
1391 {
1392 .procname = "numa_zonelist_order",
1393 .data = &numa_zonelist_order,
1394 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1395 .mode = 0644,
1396 .proc_handler = numa_zonelist_order_handler,
1397 },
1398 #endif
1399 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1400 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1401 {
1402 .procname = "vdso_enabled",
1403 .data = &vdso_enabled,
1404 .maxlen = sizeof(vdso_enabled),
1405 .mode = 0644,
1406 .proc_handler = proc_dointvec,
1407 .extra1 = &zero,
1408 },
1409 #endif
1410 #ifdef CONFIG_HIGHMEM
1411 {
1412 .procname = "highmem_is_dirtyable",
1413 .data = &vm_highmem_is_dirtyable,
1414 .maxlen = sizeof(vm_highmem_is_dirtyable),
1415 .mode = 0644,
1416 .proc_handler = proc_dointvec_minmax,
1417 .extra1 = &zero,
1418 .extra2 = &one,
1419 },
1420 #endif
1421 {
1422 .procname = "scan_unevictable_pages",
1423 .data = &scan_unevictable_pages,
1424 .maxlen = sizeof(scan_unevictable_pages),
1425 .mode = 0644,
1426 .proc_handler = scan_unevictable_handler,
1427 },
1428 #ifdef CONFIG_MEMORY_FAILURE
1429 {
1430 .procname = "memory_failure_early_kill",
1431 .data = &sysctl_memory_failure_early_kill,
1432 .maxlen = sizeof(sysctl_memory_failure_early_kill),
1433 .mode = 0644,
1434 .proc_handler = proc_dointvec_minmax,
1435 .extra1 = &zero,
1436 .extra2 = &one,
1437 },
1438 {
1439 .procname = "memory_failure_recovery",
1440 .data = &sysctl_memory_failure_recovery,
1441 .maxlen = sizeof(sysctl_memory_failure_recovery),
1442 .mode = 0644,
1443 .proc_handler = proc_dointvec_minmax,
1444 .extra1 = &zero,
1445 .extra2 = &one,
1446 },
1447 #endif
1448 {
1449 .procname = "user_reserve_kbytes",
1450 .data = &sysctl_user_reserve_kbytes,
1451 .maxlen = sizeof(sysctl_user_reserve_kbytes),
1452 .mode = 0644,
1453 .proc_handler = proc_doulongvec_minmax,
1454 },
1455 {
1456 .procname = "admin_reserve_kbytes",
1457 .data = &sysctl_admin_reserve_kbytes,
1458 .maxlen = sizeof(sysctl_admin_reserve_kbytes),
1459 .mode = 0644,
1460 .proc_handler = proc_doulongvec_minmax,
1461 },
1462 { }
1463 };
1464
1465 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1466 static struct ctl_table binfmt_misc_table[] = {
1467 { }
1468 };
1469 #endif
1470
1471 static struct ctl_table fs_table[] = {
1472 {
1473 .procname = "inode-nr",
1474 .data = &inodes_stat,
1475 .maxlen = 2*sizeof(int),
1476 .mode = 0444,
1477 .proc_handler = proc_nr_inodes,
1478 },
1479 {
1480 .procname = "inode-state",
1481 .data = &inodes_stat,
1482 .maxlen = 7*sizeof(int),
1483 .mode = 0444,
1484 .proc_handler = proc_nr_inodes,
1485 },
1486 {
1487 .procname = "file-nr",
1488 .data = &files_stat,
1489 .maxlen = sizeof(files_stat),
1490 .mode = 0444,
1491 .proc_handler = proc_nr_files,
1492 },
1493 {
1494 .procname = "file-max",
1495 .data = &files_stat.max_files,
1496 .maxlen = sizeof(files_stat.max_files),
1497 .mode = 0644,
1498 .proc_handler = proc_doulongvec_minmax,
1499 },
1500 {
1501 .procname = "nr_open",
1502 .data = &sysctl_nr_open,
1503 .maxlen = sizeof(int),
1504 .mode = 0644,
1505 .proc_handler = proc_dointvec_minmax,
1506 .extra1 = &sysctl_nr_open_min,
1507 .extra2 = &sysctl_nr_open_max,
1508 },
1509 {
1510 .procname = "dentry-state",
1511 .data = &dentry_stat,
1512 .maxlen = 6*sizeof(int),
1513 .mode = 0444,
1514 .proc_handler = proc_nr_dentry,
1515 },
1516 {
1517 .procname = "overflowuid",
1518 .data = &fs_overflowuid,
1519 .maxlen = sizeof(int),
1520 .mode = 0644,
1521 .proc_handler = proc_dointvec_minmax,
1522 .extra1 = &minolduid,
1523 .extra2 = &maxolduid,
1524 },
1525 {
1526 .procname = "overflowgid",
1527 .data = &fs_overflowgid,
1528 .maxlen = sizeof(int),
1529 .mode = 0644,
1530 .proc_handler = proc_dointvec_minmax,
1531 .extra1 = &minolduid,
1532 .extra2 = &maxolduid,
1533 },
1534 #ifdef CONFIG_FILE_LOCKING
1535 {
1536 .procname = "leases-enable",
1537 .data = &leases_enable,
1538 .maxlen = sizeof(int),
1539 .mode = 0644,
1540 .proc_handler = proc_dointvec,
1541 },
1542 #endif
1543 #ifdef CONFIG_DNOTIFY
1544 {
1545 .procname = "dir-notify-enable",
1546 .data = &dir_notify_enable,
1547 .maxlen = sizeof(int),
1548 .mode = 0644,
1549 .proc_handler = proc_dointvec,
1550 },
1551 #endif
1552 #ifdef CONFIG_MMU
1553 #ifdef CONFIG_FILE_LOCKING
1554 {
1555 .procname = "lease-break-time",
1556 .data = &lease_break_time,
1557 .maxlen = sizeof(int),
1558 .mode = 0644,
1559 .proc_handler = proc_dointvec,
1560 },
1561 #endif
1562 #ifdef CONFIG_AIO
1563 {
1564 .procname = "aio-nr",
1565 .data = &aio_nr,
1566 .maxlen = sizeof(aio_nr),
1567 .mode = 0444,
1568 .proc_handler = proc_doulongvec_minmax,
1569 },
1570 {
1571 .procname = "aio-max-nr",
1572 .data = &aio_max_nr,
1573 .maxlen = sizeof(aio_max_nr),
1574 .mode = 0644,
1575 .proc_handler = proc_doulongvec_minmax,
1576 },
1577 #endif /* CONFIG_AIO */
1578 #ifdef CONFIG_INOTIFY_USER
1579 {
1580 .procname = "inotify",
1581 .mode = 0555,
1582 .child = inotify_table,
1583 },
1584 #endif
1585 #ifdef CONFIG_EPOLL
1586 {
1587 .procname = "epoll",
1588 .mode = 0555,
1589 .child = epoll_table,
1590 },
1591 #endif
1592 #endif
1593 {
1594 .procname = "protected_symlinks",
1595 .data = &sysctl_protected_symlinks,
1596 .maxlen = sizeof(int),
1597 .mode = 0600,
1598 .proc_handler = proc_dointvec_minmax,
1599 .extra1 = &zero,
1600 .extra2 = &one,
1601 },
1602 {
1603 .procname = "protected_hardlinks",
1604 .data = &sysctl_protected_hardlinks,
1605 .maxlen = sizeof(int),
1606 .mode = 0600,
1607 .proc_handler = proc_dointvec_minmax,
1608 .extra1 = &zero,
1609 .extra2 = &one,
1610 },
1611 {
1612 .procname = "suid_dumpable",
1613 .data = &suid_dumpable,
1614 .maxlen = sizeof(int),
1615 .mode = 0644,
1616 .proc_handler = proc_dointvec_minmax_coredump,
1617 .extra1 = &zero,
1618 .extra2 = &two,
1619 },
1620 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1621 {
1622 .procname = "binfmt_misc",
1623 .mode = 0555,
1624 .child = binfmt_misc_table,
1625 },
1626 #endif
1627 {
1628 .procname = "pipe-max-size",
1629 .data = &pipe_max_size,
1630 .maxlen = sizeof(int),
1631 .mode = 0644,
1632 .proc_handler = &pipe_proc_fn,
1633 .extra1 = &pipe_min_size,
1634 },
1635 {
1636 .procname = "pipe-user-pages-hard",
1637 .data = &pipe_user_pages_hard,
1638 .maxlen = sizeof(pipe_user_pages_hard),
1639 .mode = 0644,
1640 .proc_handler = proc_doulongvec_minmax,
1641 },
1642 {
1643 .procname = "pipe-user-pages-soft",
1644 .data = &pipe_user_pages_soft,
1645 .maxlen = sizeof(pipe_user_pages_soft),
1646 .mode = 0644,
1647 .proc_handler = proc_doulongvec_minmax,
1648 },
1649 { }
1650 };
1651
1652 static struct ctl_table debug_table[] = {
1653 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
1654 {
1655 .procname = "exception-trace",
1656 .data = &show_unhandled_signals,
1657 .maxlen = sizeof(int),
1658 .mode = 0644,
1659 .proc_handler = proc_dointvec
1660 },
1661 #endif
1662 #if defined(CONFIG_OPTPROBES)
1663 {
1664 .procname = "kprobes-optimization",
1665 .data = &sysctl_kprobes_optimization,
1666 .maxlen = sizeof(int),
1667 .mode = 0644,
1668 .proc_handler = proc_kprobes_optimization_handler,
1669 .extra1 = &zero,
1670 .extra2 = &one,
1671 },
1672 #endif
1673 { }
1674 };
1675
1676 static struct ctl_table dev_table[] = {
1677 { }
1678 };
1679
1680 int __init sysctl_init(void)
1681 {
1682 struct ctl_table_header *hdr;
1683
1684 hdr = register_sysctl_table(sysctl_base_table);
1685 kmemleak_not_leak(hdr);
1686 return 0;
1687 }
1688
1689 #endif /* CONFIG_SYSCTL */
1690
1691 /*
1692 * /proc/sys support
1693 */
1694
1695 #ifdef CONFIG_PROC_SYSCTL
1696
1697 static int _proc_do_string(void* data, int maxlen, int write,
1698 void __user *buffer,
1699 size_t *lenp, loff_t *ppos)
1700 {
1701 size_t len;
1702 char __user *p;
1703 char c;
1704
1705 if (!data || !maxlen || !*lenp) {
1706 *lenp = 0;
1707 return 0;
1708 }
1709
1710 if (write) {
1711 len = 0;
1712 p = buffer;
1713 while (len < *lenp) {
1714 if (get_user(c, p++))
1715 return -EFAULT;
1716 if (c == 0 || c == '\n')
1717 break;
1718 len++;
1719 }
1720 if (len >= maxlen)
1721 len = maxlen-1;
1722 if(copy_from_user(data, buffer, len))
1723 return -EFAULT;
1724 ((char *) data)[len] = 0;
1725 *ppos += *lenp;
1726 } else {
1727 len = strlen(data);
1728 if (len > maxlen)
1729 len = maxlen;
1730
1731 if (*ppos > len) {
1732 *lenp = 0;
1733 return 0;
1734 }
1735
1736 data += *ppos;
1737 len -= *ppos;
1738
1739 if (len > *lenp)
1740 len = *lenp;
1741 if (len)
1742 if(copy_to_user(buffer, data, len))
1743 return -EFAULT;
1744 if (len < *lenp) {
1745 if(put_user('\n', ((char __user *) buffer) + len))
1746 return -EFAULT;
1747 len++;
1748 }
1749 *lenp = len;
1750 *ppos += len;
1751 }
1752 return 0;
1753 }
1754
1755 /**
1756 * proc_dostring - read a string sysctl
1757 * @table: the sysctl table
1758 * @write: %TRUE if this is a write to the sysctl file
1759 * @buffer: the user buffer
1760 * @lenp: the size of the user buffer
1761 * @ppos: file position
1762 *
1763 * Reads/writes a string from/to the user buffer. If the kernel
1764 * buffer provided is not large enough to hold the string, the
1765 * string is truncated. The copied string is %NULL-terminated.
1766 * If the string is being read by the user process, it is copied
1767 * and a newline '\n' is added. It is truncated if the buffer is
1768 * not large enough.
1769 *
1770 * Returns 0 on success.
1771 */
1772 int proc_dostring(struct ctl_table *table, int write,
1773 void __user *buffer, size_t *lenp, loff_t *ppos)
1774 {
1775 return _proc_do_string(table->data, table->maxlen, write,
1776 buffer, lenp, ppos);
1777 }
1778
1779 static size_t proc_skip_spaces(char **buf)
1780 {
1781 size_t ret;
1782 char *tmp = skip_spaces(*buf);
1783 ret = tmp - *buf;
1784 *buf = tmp;
1785 return ret;
1786 }
1787
1788 static void proc_skip_char(char **buf, size_t *size, const char v)
1789 {
1790 while (*size) {
1791 if (**buf != v)
1792 break;
1793 (*size)--;
1794 (*buf)++;
1795 }
1796 }
1797
1798 #define TMPBUFLEN 22
1799 /**
1800 * proc_get_long - reads an ASCII formatted integer from a user buffer
1801 *
1802 * @buf: a kernel buffer
1803 * @size: size of the kernel buffer
1804 * @val: this is where the number will be stored
1805 * @neg: set to %TRUE if number is negative
1806 * @perm_tr: a vector which contains the allowed trailers
1807 * @perm_tr_len: size of the perm_tr vector
1808 * @tr: pointer to store the trailer character
1809 *
1810 * In case of success %0 is returned and @buf and @size are updated with
1811 * the amount of bytes read. If @tr is non-NULL and a trailing
1812 * character exists (size is non-zero after returning from this
1813 * function), @tr is updated with the trailing character.
1814 */
1815 static int proc_get_long(char **buf, size_t *size,
1816 unsigned long *val, bool *neg,
1817 const char *perm_tr, unsigned perm_tr_len, char *tr)
1818 {
1819 int len;
1820 char *p, tmp[TMPBUFLEN];
1821
1822 if (!*size)
1823 return -EINVAL;
1824
1825 len = *size;
1826 if (len > TMPBUFLEN - 1)
1827 len = TMPBUFLEN - 1;
1828
1829 memcpy(tmp, *buf, len);
1830
1831 tmp[len] = 0;
1832 p = tmp;
1833 if (*p == '-' && *size > 1) {
1834 *neg = true;
1835 p++;
1836 } else
1837 *neg = false;
1838 if (!isdigit(*p))
1839 return -EINVAL;
1840
1841 *val = simple_strtoul(p, &p, 0);
1842
1843 len = p - tmp;
1844
1845 /* We don't know if the next char is whitespace thus we may accept
1846 * invalid integers (e.g. 1234...a) or two integers instead of one
1847 * (e.g. 123...1). So lets not allow such large numbers. */
1848 if (len == TMPBUFLEN - 1)
1849 return -EINVAL;
1850
1851 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
1852 return -EINVAL;
1853
1854 if (tr && (len < *size))
1855 *tr = *p;
1856
1857 *buf += len;
1858 *size -= len;
1859
1860 return 0;
1861 }
1862
1863 /**
1864 * proc_put_long - converts an integer to a decimal ASCII formatted string
1865 *
1866 * @buf: the user buffer
1867 * @size: the size of the user buffer
1868 * @val: the integer to be converted
1869 * @neg: sign of the number, %TRUE for negative
1870 *
1871 * In case of success %0 is returned and @buf and @size are updated with
1872 * the amount of bytes written.
1873 */
1874 static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
1875 bool neg)
1876 {
1877 int len;
1878 char tmp[TMPBUFLEN], *p = tmp;
1879
1880 sprintf(p, "%s%lu", neg ? "-" : "", val);
1881 len = strlen(tmp);
1882 if (len > *size)
1883 len = *size;
1884 if (copy_to_user(*buf, tmp, len))
1885 return -EFAULT;
1886 *size -= len;
1887 *buf += len;
1888 return 0;
1889 }
1890 #undef TMPBUFLEN
1891
1892 static int proc_put_char(void __user **buf, size_t *size, char c)
1893 {
1894 if (*size) {
1895 char __user **buffer = (char __user **)buf;
1896 if (put_user(c, *buffer))
1897 return -EFAULT;
1898 (*size)--, (*buffer)++;
1899 *buf = *buffer;
1900 }
1901 return 0;
1902 }
1903
1904 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
1905 int *valp,
1906 int write, void *data)
1907 {
1908 if (write) {
1909 *valp = *negp ? -*lvalp : *lvalp;
1910 } else {
1911 int val = *valp;
1912 if (val < 0) {
1913 *negp = true;
1914 *lvalp = (unsigned long)-val;
1915 } else {
1916 *negp = false;
1917 *lvalp = (unsigned long)val;
1918 }
1919 }
1920 return 0;
1921 }
1922
1923 static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
1924
1925 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
1926 int write, void __user *buffer,
1927 size_t *lenp, loff_t *ppos,
1928 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
1929 int write, void *data),
1930 void *data)
1931 {
1932 int *i, vleft, first = 1, err = 0;
1933 unsigned long page = 0;
1934 size_t left;
1935 char *kbuf;
1936
1937 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
1938 *lenp = 0;
1939 return 0;
1940 }
1941
1942 i = (int *) tbl_data;
1943 vleft = table->maxlen / sizeof(*i);
1944 left = *lenp;
1945
1946 if (!conv)
1947 conv = do_proc_dointvec_conv;
1948
1949 if (write) {
1950 if (left > PAGE_SIZE - 1)
1951 left = PAGE_SIZE - 1;
1952 page = __get_free_page(GFP_TEMPORARY);
1953 kbuf = (char *) page;
1954 if (!kbuf)
1955 return -ENOMEM;
1956 if (copy_from_user(kbuf, buffer, left)) {
1957 err = -EFAULT;
1958 goto free;
1959 }
1960 kbuf[left] = 0;
1961 }
1962
1963 for (; left && vleft--; i++, first=0) {
1964 unsigned long lval;
1965 bool neg;
1966
1967 if (write) {
1968 left -= proc_skip_spaces(&kbuf);
1969
1970 if (!left)
1971 break;
1972 err = proc_get_long(&kbuf, &left, &lval, &neg,
1973 proc_wspace_sep,
1974 sizeof(proc_wspace_sep), NULL);
1975 if (err)
1976 break;
1977 if (conv(&neg, &lval, i, 1, data)) {
1978 err = -EINVAL;
1979 break;
1980 }
1981 } else {
1982 if (conv(&neg, &lval, i, 0, data)) {
1983 err = -EINVAL;
1984 break;
1985 }
1986 if (!first)
1987 err = proc_put_char(&buffer, &left, '\t');
1988 if (err)
1989 break;
1990 err = proc_put_long(&buffer, &left, lval, neg);
1991 if (err)
1992 break;
1993 }
1994 }
1995
1996 if (!write && !first && left && !err)
1997 err = proc_put_char(&buffer, &left, '\n');
1998 if (write && !err && left)
1999 left -= proc_skip_spaces(&kbuf);
2000 free:
2001 if (write) {
2002 free_page(page);
2003 if (first)
2004 return err ? : -EINVAL;
2005 }
2006 *lenp -= left;
2007 *ppos += *lenp;
2008 return err;
2009 }
2010
2011 static int do_proc_dointvec(struct ctl_table *table, int write,
2012 void __user *buffer, size_t *lenp, loff_t *ppos,
2013 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2014 int write, void *data),
2015 void *data)
2016 {
2017 return __do_proc_dointvec(table->data, table, write,
2018 buffer, lenp, ppos, conv, data);
2019 }
2020
2021 /**
2022 * proc_dointvec - read a vector of integers
2023 * @table: the sysctl table
2024 * @write: %TRUE if this is a write to the sysctl file
2025 * @buffer: the user buffer
2026 * @lenp: the size of the user buffer
2027 * @ppos: file position
2028 *
2029 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2030 * values from/to the user buffer, treated as an ASCII string.
2031 *
2032 * Returns 0 on success.
2033 */
2034 int proc_dointvec(struct ctl_table *table, int write,
2035 void __user *buffer, size_t *lenp, loff_t *ppos)
2036 {
2037 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2038 NULL,NULL);
2039 }
2040
2041 /*
2042 * Taint values can only be increased
2043 * This means we can safely use a temporary.
2044 */
2045 static int proc_taint(struct ctl_table *table, int write,
2046 void __user *buffer, size_t *lenp, loff_t *ppos)
2047 {
2048 struct ctl_table t;
2049 unsigned long tmptaint = get_taint();
2050 int err;
2051
2052 if (write && !capable(CAP_SYS_ADMIN))
2053 return -EPERM;
2054
2055 t = *table;
2056 t.data = &tmptaint;
2057 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
2058 if (err < 0)
2059 return err;
2060
2061 if (write) {
2062 /*
2063 * Poor man's atomic or. Not worth adding a primitive
2064 * to everyone's atomic.h for this
2065 */
2066 int i;
2067 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2068 if ((tmptaint >> i) & 1)
2069 add_taint(i, LOCKDEP_STILL_OK);
2070 }
2071 }
2072
2073 return err;
2074 }
2075
2076 #ifdef CONFIG_PRINTK
2077 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
2078 void __user *buffer, size_t *lenp, loff_t *ppos)
2079 {
2080 if (write && !capable(CAP_SYS_ADMIN))
2081 return -EPERM;
2082
2083 return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2084 }
2085 #endif
2086
2087 struct do_proc_dointvec_minmax_conv_param {
2088 int *min;
2089 int *max;
2090 };
2091
2092 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
2093 int *valp,
2094 int write, void *data)
2095 {
2096 struct do_proc_dointvec_minmax_conv_param *param = data;
2097 if (write) {
2098 int val = *negp ? -*lvalp : *lvalp;
2099 if ((param->min && *param->min > val) ||
2100 (param->max && *param->max < val))
2101 return -EINVAL;
2102 *valp = val;
2103 } else {
2104 int val = *valp;
2105 if (val < 0) {
2106 *negp = true;
2107 *lvalp = (unsigned long)-val;
2108 } else {
2109 *negp = false;
2110 *lvalp = (unsigned long)val;
2111 }
2112 }
2113 return 0;
2114 }
2115
2116 /**
2117 * proc_dointvec_minmax - read a vector of integers with min/max values
2118 * @table: the sysctl table
2119 * @write: %TRUE if this is a write to the sysctl file
2120 * @buffer: the user buffer
2121 * @lenp: the size of the user buffer
2122 * @ppos: file position
2123 *
2124 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2125 * values from/to the user buffer, treated as an ASCII string.
2126 *
2127 * This routine will ensure the values are within the range specified by
2128 * table->extra1 (min) and table->extra2 (max).
2129 *
2130 * Returns 0 on success.
2131 */
2132 int proc_dointvec_minmax(struct ctl_table *table, int write,
2133 void __user *buffer, size_t *lenp, loff_t *ppos)
2134 {
2135 struct do_proc_dointvec_minmax_conv_param param = {
2136 .min = (int *) table->extra1,
2137 .max = (int *) table->extra2,
2138 };
2139 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2140 do_proc_dointvec_minmax_conv, &param);
2141 }
2142
2143 static void validate_coredump_safety(void)
2144 {
2145 #ifdef CONFIG_COREDUMP
2146 if (suid_dumpable == SUID_DUMP_ROOT &&
2147 core_pattern[0] != '/' && core_pattern[0] != '|') {
2148 printk(KERN_WARNING "Unsafe core_pattern used with "\
2149 "suid_dumpable=2. Pipe handler or fully qualified "\
2150 "core dump path required.\n");
2151 }
2152 #endif
2153 }
2154
2155 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
2156 void __user *buffer, size_t *lenp, loff_t *ppos)
2157 {
2158 int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2159 if (!error)
2160 validate_coredump_safety();
2161 return error;
2162 }
2163
2164 #ifdef CONFIG_COREDUMP
2165 static int proc_dostring_coredump(struct ctl_table *table, int write,
2166 void __user *buffer, size_t *lenp, loff_t *ppos)
2167 {
2168 int error = proc_dostring(table, write, buffer, lenp, ppos);
2169 if (!error)
2170 validate_coredump_safety();
2171 return error;
2172 }
2173 #endif
2174
2175 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2176 void __user *buffer,
2177 size_t *lenp, loff_t *ppos,
2178 unsigned long convmul,
2179 unsigned long convdiv)
2180 {
2181 unsigned long *i, *min, *max;
2182 int vleft, first = 1, err = 0;
2183 unsigned long page = 0;
2184 size_t left;
2185 char *kbuf;
2186
2187 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
2188 *lenp = 0;
2189 return 0;
2190 }
2191
2192 i = (unsigned long *) data;
2193 min = (unsigned long *) table->extra1;
2194 max = (unsigned long *) table->extra2;
2195 vleft = table->maxlen / sizeof(unsigned long);
2196 left = *lenp;
2197
2198 if (write) {
2199 if (left > PAGE_SIZE - 1)
2200 left = PAGE_SIZE - 1;
2201 page = __get_free_page(GFP_TEMPORARY);
2202 kbuf = (char *) page;
2203 if (!kbuf)
2204 return -ENOMEM;
2205 if (copy_from_user(kbuf, buffer, left)) {
2206 err = -EFAULT;
2207 goto free;
2208 }
2209 kbuf[left] = 0;
2210 }
2211
2212 for (; left && vleft--; i++, first = 0) {
2213 unsigned long val;
2214
2215 if (write) {
2216 bool neg;
2217
2218 left -= proc_skip_spaces(&kbuf);
2219
2220 err = proc_get_long(&kbuf, &left, &val, &neg,
2221 proc_wspace_sep,
2222 sizeof(proc_wspace_sep), NULL);
2223 if (err)
2224 break;
2225 if (neg)
2226 continue;
2227 val = convmul * val / convdiv;
2228 if ((min && val < *min) || (max && val > *max))
2229 continue;
2230 *i = val;
2231 } else {
2232 val = convdiv * (*i) / convmul;
2233 if (!first)
2234 err = proc_put_char(&buffer, &left, '\t');
2235 err = proc_put_long(&buffer, &left, val, false);
2236 if (err)
2237 break;
2238 }
2239 }
2240
2241 if (!write && !first && left && !err)
2242 err = proc_put_char(&buffer, &left, '\n');
2243 if (write && !err)
2244 left -= proc_skip_spaces(&kbuf);
2245 free:
2246 if (write) {
2247 free_page(page);
2248 if (first)
2249 return err ? : -EINVAL;
2250 }
2251 *lenp -= left;
2252 *ppos += *lenp;
2253 return err;
2254 }
2255
2256 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2257 void __user *buffer,
2258 size_t *lenp, loff_t *ppos,
2259 unsigned long convmul,
2260 unsigned long convdiv)
2261 {
2262 return __do_proc_doulongvec_minmax(table->data, table, write,
2263 buffer, lenp, ppos, convmul, convdiv);
2264 }
2265
2266 /**
2267 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2268 * @table: the sysctl table
2269 * @write: %TRUE if this is a write to the sysctl file
2270 * @buffer: the user buffer
2271 * @lenp: the size of the user buffer
2272 * @ppos: file position
2273 *
2274 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2275 * values from/to the user buffer, treated as an ASCII string.
2276 *
2277 * This routine will ensure the values are within the range specified by
2278 * table->extra1 (min) and table->extra2 (max).
2279 *
2280 * Returns 0 on success.
2281 */
2282 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2283 void __user *buffer, size_t *lenp, loff_t *ppos)
2284 {
2285 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
2286 }
2287
2288 /**
2289 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2290 * @table: the sysctl table
2291 * @write: %TRUE if this is a write to the sysctl file
2292 * @buffer: the user buffer
2293 * @lenp: the size of the user buffer
2294 * @ppos: file position
2295 *
2296 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2297 * values from/to the user buffer, treated as an ASCII string. The values
2298 * are treated as milliseconds, and converted to jiffies when they are stored.
2299 *
2300 * This routine will ensure the values are within the range specified by
2301 * table->extra1 (min) and table->extra2 (max).
2302 *
2303 * Returns 0 on success.
2304 */
2305 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2306 void __user *buffer,
2307 size_t *lenp, loff_t *ppos)
2308 {
2309 return do_proc_doulongvec_minmax(table, write, buffer,
2310 lenp, ppos, HZ, 1000l);
2311 }
2312
2313
2314 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
2315 int *valp,
2316 int write, void *data)
2317 {
2318 if (write) {
2319 if (*lvalp > LONG_MAX / HZ)
2320 return 1;
2321 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2322 } else {
2323 int val = *valp;
2324 unsigned long lval;
2325 if (val < 0) {
2326 *negp = true;
2327 lval = (unsigned long)-val;
2328 } else {
2329 *negp = false;
2330 lval = (unsigned long)val;
2331 }
2332 *lvalp = lval / HZ;
2333 }
2334 return 0;
2335 }
2336
2337 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
2338 int *valp,
2339 int write, void *data)
2340 {
2341 if (write) {
2342 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2343 return 1;
2344 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2345 } else {
2346 int val = *valp;
2347 unsigned long lval;
2348 if (val < 0) {
2349 *negp = true;
2350 lval = (unsigned long)-val;
2351 } else {
2352 *negp = false;
2353 lval = (unsigned long)val;
2354 }
2355 *lvalp = jiffies_to_clock_t(lval);
2356 }
2357 return 0;
2358 }
2359
2360 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
2361 int *valp,
2362 int write, void *data)
2363 {
2364 if (write) {
2365 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2366 } else {
2367 int val = *valp;
2368 unsigned long lval;
2369 if (val < 0) {
2370 *negp = true;
2371 lval = (unsigned long)-val;
2372 } else {
2373 *negp = false;
2374 lval = (unsigned long)val;
2375 }
2376 *lvalp = jiffies_to_msecs(lval);
2377 }
2378 return 0;
2379 }
2380
2381 /**
2382 * proc_dointvec_jiffies - read a vector of integers as seconds
2383 * @table: the sysctl table
2384 * @write: %TRUE if this is a write to the sysctl file
2385 * @buffer: the user buffer
2386 * @lenp: the size of the user buffer
2387 * @ppos: file position
2388 *
2389 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2390 * values from/to the user buffer, treated as an ASCII string.
2391 * The values read are assumed to be in seconds, and are converted into
2392 * jiffies.
2393 *
2394 * Returns 0 on success.
2395 */
2396 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2397 void __user *buffer, size_t *lenp, loff_t *ppos)
2398 {
2399 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2400 do_proc_dointvec_jiffies_conv,NULL);
2401 }
2402
2403 /**
2404 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2405 * @table: the sysctl table
2406 * @write: %TRUE if this is a write to the sysctl file
2407 * @buffer: the user buffer
2408 * @lenp: the size of the user buffer
2409 * @ppos: pointer to the file position
2410 *
2411 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2412 * values from/to the user buffer, treated as an ASCII string.
2413 * The values read are assumed to be in 1/USER_HZ seconds, and
2414 * are converted into jiffies.
2415 *
2416 * Returns 0 on success.
2417 */
2418 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2419 void __user *buffer, size_t *lenp, loff_t *ppos)
2420 {
2421 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2422 do_proc_dointvec_userhz_jiffies_conv,NULL);
2423 }
2424
2425 /**
2426 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2427 * @table: the sysctl table
2428 * @write: %TRUE if this is a write to the sysctl file
2429 * @buffer: the user buffer
2430 * @lenp: the size of the user buffer
2431 * @ppos: file position
2432 * @ppos: the current position in the file
2433 *
2434 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2435 * values from/to the user buffer, treated as an ASCII string.
2436 * The values read are assumed to be in 1/1000 seconds, and
2437 * are converted into jiffies.
2438 *
2439 * Returns 0 on success.
2440 */
2441 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2442 void __user *buffer, size_t *lenp, loff_t *ppos)
2443 {
2444 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2445 do_proc_dointvec_ms_jiffies_conv, NULL);
2446 }
2447
2448 static int proc_do_cad_pid(struct ctl_table *table, int write,
2449 void __user *buffer, size_t *lenp, loff_t *ppos)
2450 {
2451 struct pid *new_pid;
2452 pid_t tmp;
2453 int r;
2454
2455 tmp = pid_vnr(cad_pid);
2456
2457 r = __do_proc_dointvec(&tmp, table, write, buffer,
2458 lenp, ppos, NULL, NULL);
2459 if (r || !write)
2460 return r;
2461
2462 new_pid = find_get_pid(tmp);
2463 if (!new_pid)
2464 return -ESRCH;
2465
2466 put_pid(xchg(&cad_pid, new_pid));
2467 return 0;
2468 }
2469
2470 /**
2471 * proc_do_large_bitmap - read/write from/to a large bitmap
2472 * @table: the sysctl table
2473 * @write: %TRUE if this is a write to the sysctl file
2474 * @buffer: the user buffer
2475 * @lenp: the size of the user buffer
2476 * @ppos: file position
2477 *
2478 * The bitmap is stored at table->data and the bitmap length (in bits)
2479 * in table->maxlen.
2480 *
2481 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2482 * large bitmaps may be represented in a compact manner. Writing into
2483 * the file will clear the bitmap then update it with the given input.
2484 *
2485 * Returns 0 on success.
2486 */
2487 int proc_do_large_bitmap(struct ctl_table *table, int write,
2488 void __user *buffer, size_t *lenp, loff_t *ppos)
2489 {
2490 int err = 0;
2491 bool first = 1;
2492 size_t left = *lenp;
2493 unsigned long bitmap_len = table->maxlen;
2494 unsigned long *bitmap = (unsigned long *) table->data;
2495 unsigned long *tmp_bitmap = NULL;
2496 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
2497
2498 if (!bitmap_len || !left || (*ppos && !write)) {
2499 *lenp = 0;
2500 return 0;
2501 }
2502
2503 if (write) {
2504 unsigned long page = 0;
2505 char *kbuf;
2506
2507 if (left > PAGE_SIZE - 1)
2508 left = PAGE_SIZE - 1;
2509
2510 page = __get_free_page(GFP_TEMPORARY);
2511 kbuf = (char *) page;
2512 if (!kbuf)
2513 return -ENOMEM;
2514 if (copy_from_user(kbuf, buffer, left)) {
2515 free_page(page);
2516 return -EFAULT;
2517 }
2518 kbuf[left] = 0;
2519
2520 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long),
2521 GFP_KERNEL);
2522 if (!tmp_bitmap) {
2523 free_page(page);
2524 return -ENOMEM;
2525 }
2526 proc_skip_char(&kbuf, &left, '\n');
2527 while (!err && left) {
2528 unsigned long val_a, val_b;
2529 bool neg;
2530
2531 err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a,
2532 sizeof(tr_a), &c);
2533 if (err)
2534 break;
2535 if (val_a >= bitmap_len || neg) {
2536 err = -EINVAL;
2537 break;
2538 }
2539
2540 val_b = val_a;
2541 if (left) {
2542 kbuf++;
2543 left--;
2544 }
2545
2546 if (c == '-') {
2547 err = proc_get_long(&kbuf, &left, &val_b,
2548 &neg, tr_b, sizeof(tr_b),
2549 &c);
2550 if (err)
2551 break;
2552 if (val_b >= bitmap_len || neg ||
2553 val_a > val_b) {
2554 err = -EINVAL;
2555 break;
2556 }
2557 if (left) {
2558 kbuf++;
2559 left--;
2560 }
2561 }
2562
2563 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
2564 first = 0;
2565 proc_skip_char(&kbuf, &left, '\n');
2566 }
2567 free_page(page);
2568 } else {
2569 unsigned long bit_a, bit_b = 0;
2570
2571 while (left) {
2572 bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
2573 if (bit_a >= bitmap_len)
2574 break;
2575 bit_b = find_next_zero_bit(bitmap, bitmap_len,
2576 bit_a + 1) - 1;
2577
2578 if (!first) {
2579 err = proc_put_char(&buffer, &left, ',');
2580 if (err)
2581 break;
2582 }
2583 err = proc_put_long(&buffer, &left, bit_a, false);
2584 if (err)
2585 break;
2586 if (bit_a != bit_b) {
2587 err = proc_put_char(&buffer, &left, '-');
2588 if (err)
2589 break;
2590 err = proc_put_long(&buffer, &left, bit_b, false);
2591 if (err)
2592 break;
2593 }
2594
2595 first = 0; bit_b++;
2596 }
2597 if (!err)
2598 err = proc_put_char(&buffer, &left, '\n');
2599 }
2600
2601 if (!err) {
2602 if (write) {
2603 if (*ppos)
2604 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
2605 else
2606 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
2607 }
2608 kfree(tmp_bitmap);
2609 *lenp -= left;
2610 *ppos += *lenp;
2611 return 0;
2612 } else {
2613 kfree(tmp_bitmap);
2614 return err;
2615 }
2616 }
2617
2618 #else /* CONFIG_PROC_SYSCTL */
2619
2620 int proc_dostring(struct ctl_table *table, int write,
2621 void __user *buffer, size_t *lenp, loff_t *ppos)
2622 {
2623 return -ENOSYS;
2624 }
2625
2626 int proc_dointvec(struct ctl_table *table, int write,
2627 void __user *buffer, size_t *lenp, loff_t *ppos)
2628 {
2629 return -ENOSYS;
2630 }
2631
2632 int proc_dointvec_minmax(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_jiffies(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_userhz_jiffies(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_ms_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_doulongvec_minmax(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_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2663 void __user *buffer,
2664 size_t *lenp, loff_t *ppos)
2665 {
2666 return -ENOSYS;
2667 }
2668
2669
2670 #endif /* CONFIG_PROC_SYSCTL */
2671
2672 /*
2673 * No sense putting this after each symbol definition, twice,
2674 * exception granted :-)
2675 */
2676 EXPORT_SYMBOL(proc_dointvec);
2677 EXPORT_SYMBOL(proc_dointvec_jiffies);
2678 EXPORT_SYMBOL(proc_dointvec_minmax);
2679 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2680 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2681 EXPORT_SYMBOL(proc_dostring);
2682 EXPORT_SYMBOL(proc_doulongvec_minmax);
2683 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
kernel source for telekom puls (alcatel/mediatek)