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Merge tag 'v3.10.103' into update
[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 extra_free_kbytes;
109 extern int min_free_order_shift;
110 extern int pid_max_min, pid_max_max;
111 extern int percpu_pagelist_fraction;
112 extern int compat_log;
113 extern int latencytop_enabled;
114 extern int sysctl_nr_open_min, sysctl_nr_open_max;
115 #ifndef CONFIG_MMU
116 extern int sysctl_nr_trim_pages;
117 #endif
118 #ifdef CONFIG_BLOCK
119 extern int blk_iopoll_enabled;
120 #endif
121
122 /* Constants used for minimum and maximum */
123 #ifdef CONFIG_LOCKUP_DETECTOR
124 static int sixty = 60;
125 static int neg_one = -1;
126 #endif
127
128 static int zero;
129 static int __maybe_unused one = 1;
130 static int __maybe_unused two = 2;
131 static int __maybe_unused three = 3;
132 static unsigned long one_ul = 1;
133 static int one_hundred = 100;
134 #ifdef CONFIG_PRINTK
135 static int ten_thousand = 10000;
136 #endif
137
138 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
139 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
140
141 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
142 static int maxolduid = 65535;
143 static int minolduid;
144 static int min_percpu_pagelist_fract = 8;
145
146 static int ngroups_max = NGROUPS_MAX;
147 static const int cap_last_cap = CAP_LAST_CAP;
148
149 /*this is needed for proc_doulongvec_minmax of sysctl_hung_task_timeout_secs */
150 #ifdef CONFIG_DETECT_HUNG_TASK
151 static unsigned long hung_task_timeout_max = (LONG_MAX/HZ);
152 #endif
153
154 #ifdef CONFIG_INOTIFY_USER
155 #include <linux/inotify.h>
156 #endif
157 #ifdef CONFIG_SPARC
158 #endif
159
160 #ifdef CONFIG_SPARC64
161 extern int sysctl_tsb_ratio;
162 #endif
163
164 #ifdef __hppa__
165 extern int pwrsw_enabled;
166 #endif
167
168 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
169 extern int unaligned_enabled;
170 #endif
171
172 #ifdef CONFIG_IA64
173 extern int unaligned_dump_stack;
174 #endif
175
176 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
177 extern int no_unaligned_warning;
178 #endif
179
180 #ifdef CONFIG_PROC_SYSCTL
181 static int proc_do_cad_pid(struct ctl_table *table, int write,
182 void __user *buffer, size_t *lenp, loff_t *ppos);
183 static int proc_taint(struct ctl_table *table, int write,
184 void __user *buffer, size_t *lenp, loff_t *ppos);
185 #endif
186
187 #ifdef CONFIG_PRINTK
188 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
189 void __user *buffer, size_t *lenp, loff_t *ppos);
190 #endif
191
192 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
193 void __user *buffer, size_t *lenp, loff_t *ppos);
194 #ifdef CONFIG_COREDUMP
195 static int proc_dostring_coredump(struct ctl_table *table, int write,
196 void __user *buffer, size_t *lenp, loff_t *ppos);
197 #endif
198
199 #ifdef CONFIG_MAGIC_SYSRQ
200 /* Note: sysrq code uses it's own private copy */
201 static int __sysrq_enabled = SYSRQ_DEFAULT_ENABLE;
202
203 static int sysrq_sysctl_handler(ctl_table *table, int write,
204 void __user *buffer, size_t *lenp,
205 loff_t *ppos)
206 {
207 int error;
208
209 error = proc_dointvec(table, write, buffer, lenp, ppos);
210 if (error)
211 return error;
212
213 if (write)
214 sysrq_toggle_support(__sysrq_enabled);
215
216 return 0;
217 }
218
219 #endif
220
221 static struct ctl_table kern_table[];
222 static struct ctl_table vm_table[];
223 static struct ctl_table fs_table[];
224 static struct ctl_table debug_table[];
225 static struct ctl_table dev_table[];
226 extern struct ctl_table random_table[];
227 #ifdef CONFIG_EPOLL
228 extern struct ctl_table epoll_table[];
229 #endif
230
231 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
232 int sysctl_legacy_va_layout;
233 #endif
234
235 /* The default sysctl tables: */
236
237 static struct ctl_table sysctl_base_table[] = {
238 {
239 .procname = "kernel",
240 .mode = 0555,
241 .child = kern_table,
242 },
243 {
244 .procname = "vm",
245 .mode = 0555,
246 .child = vm_table,
247 },
248 {
249 .procname = "fs",
250 .mode = 0555,
251 .child = fs_table,
252 },
253 {
254 .procname = "debug",
255 .mode = 0555,
256 .child = debug_table,
257 },
258 {
259 .procname = "dev",
260 .mode = 0555,
261 .child = dev_table,
262 },
263 { }
264 };
265
266 #ifdef CONFIG_SCHED_DEBUG
267 static int min_sched_granularity_ns = 100000; /* 100 usecs */
268 static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */
269 static int min_wakeup_granularity_ns; /* 0 usecs */
270 static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */
271 #ifdef CONFIG_SMP
272 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
273 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
274 #endif /* CONFIG_SMP */
275 #endif /* CONFIG_SCHED_DEBUG */
276
277 #ifdef CONFIG_COMPACTION
278 static int min_extfrag_threshold;
279 static int max_extfrag_threshold = 1000;
280 #endif
281
282 static struct ctl_table kern_table[] = {
283 {
284 .procname = "sched_child_runs_first",
285 .data = &sysctl_sched_child_runs_first,
286 .maxlen = sizeof(unsigned int),
287 .mode = 0644,
288 .proc_handler = proc_dointvec,
289 },
290 #ifdef CONFIG_SCHED_DEBUG
291 {
292 .procname = "sched_min_granularity_ns",
293 .data = &sysctl_sched_min_granularity,
294 .maxlen = sizeof(unsigned int),
295 .mode = 0644,
296 .proc_handler = sched_proc_update_handler,
297 .extra1 = &min_sched_granularity_ns,
298 .extra2 = &max_sched_granularity_ns,
299 },
300 {
301 .procname = "sched_latency_ns",
302 .data = &sysctl_sched_latency,
303 .maxlen = sizeof(unsigned int),
304 .mode = 0644,
305 .proc_handler = sched_proc_update_handler,
306 .extra1 = &min_sched_granularity_ns,
307 .extra2 = &max_sched_granularity_ns,
308 },
309 {
310 .procname = "sched_wakeup_granularity_ns",
311 .data = &sysctl_sched_wakeup_granularity,
312 .maxlen = sizeof(unsigned int),
313 .mode = 0644,
314 .proc_handler = sched_proc_update_handler,
315 .extra1 = &min_wakeup_granularity_ns,
316 .extra2 = &max_wakeup_granularity_ns,
317 },
318 #ifdef CONFIG_SMP
319 {
320 .procname = "sched_tunable_scaling",
321 .data = &sysctl_sched_tunable_scaling,
322 .maxlen = sizeof(enum sched_tunable_scaling),
323 .mode = 0644,
324 .proc_handler = sched_proc_update_handler,
325 .extra1 = &min_sched_tunable_scaling,
326 .extra2 = &max_sched_tunable_scaling,
327 },
328 {
329 .procname = "sched_migration_cost_ns",
330 .data = &sysctl_sched_migration_cost,
331 .maxlen = sizeof(unsigned int),
332 .mode = 0644,
333 .proc_handler = proc_dointvec,
334 },
335 {
336 .procname = "sched_nr_migrate",
337 .data = &sysctl_sched_nr_migrate,
338 .maxlen = sizeof(unsigned int),
339 .mode = 0644,
340 .proc_handler = proc_dointvec,
341 },
342 {
343 .procname = "sched_time_avg_ms",
344 .data = &sysctl_sched_time_avg,
345 .maxlen = sizeof(unsigned int),
346 .mode = 0644,
347 .proc_handler = proc_dointvec,
348 },
349 {
350 .procname = "sched_shares_window_ns",
351 .data = &sysctl_sched_shares_window,
352 .maxlen = sizeof(unsigned int),
353 .mode = 0644,
354 .proc_handler = proc_dointvec,
355 },
356 {
357 .procname = "timer_migration",
358 .data = &sysctl_timer_migration,
359 .maxlen = sizeof(unsigned int),
360 .mode = 0644,
361 .proc_handler = proc_dointvec_minmax,
362 .extra1 = &zero,
363 .extra2 = &one,
364 },
365 #endif /* CONFIG_SMP */
366 #ifdef CONFIG_NUMA_BALANCING
367 {
368 .procname = "numa_balancing_scan_delay_ms",
369 .data = &sysctl_numa_balancing_scan_delay,
370 .maxlen = sizeof(unsigned int),
371 .mode = 0644,
372 .proc_handler = proc_dointvec,
373 },
374 {
375 .procname = "numa_balancing_scan_period_min_ms",
376 .data = &sysctl_numa_balancing_scan_period_min,
377 .maxlen = sizeof(unsigned int),
378 .mode = 0644,
379 .proc_handler = proc_dointvec,
380 },
381 {
382 .procname = "numa_balancing_scan_period_reset",
383 .data = &sysctl_numa_balancing_scan_period_reset,
384 .maxlen = sizeof(unsigned int),
385 .mode = 0644,
386 .proc_handler = proc_dointvec,
387 },
388 {
389 .procname = "numa_balancing_scan_period_max_ms",
390 .data = &sysctl_numa_balancing_scan_period_max,
391 .maxlen = sizeof(unsigned int),
392 .mode = 0644,
393 .proc_handler = proc_dointvec,
394 },
395 {
396 .procname = "numa_balancing_scan_size_mb",
397 .data = &sysctl_numa_balancing_scan_size,
398 .maxlen = sizeof(unsigned int),
399 .mode = 0644,
400 .proc_handler = proc_dointvec,
401 },
402 #endif /* CONFIG_NUMA_BALANCING */
403 #endif /* CONFIG_SCHED_DEBUG */
404 {
405 .procname = "sched_rt_period_us",
406 .data = &sysctl_sched_rt_period,
407 .maxlen = sizeof(unsigned int),
408 .mode = 0644,
409 .proc_handler = sched_rt_handler,
410 },
411 {
412 .procname = "sched_rt_runtime_us",
413 .data = &sysctl_sched_rt_runtime,
414 .maxlen = sizeof(int),
415 .mode = 0644,
416 .proc_handler = sched_rt_handler,
417 },
418 {
419 .procname = "sched_rr_timeslice_ms",
420 .data = &sched_rr_timeslice,
421 .maxlen = sizeof(int),
422 .mode = 0644,
423 .proc_handler = sched_rr_handler,
424 },
425 #ifdef CONFIG_SCHED_AUTOGROUP
426 {
427 .procname = "sched_autogroup_enabled",
428 .data = &sysctl_sched_autogroup_enabled,
429 .maxlen = sizeof(unsigned int),
430 .mode = 0644,
431 .proc_handler = proc_dointvec_minmax,
432 .extra1 = &zero,
433 .extra2 = &one,
434 },
435 #endif
436 #ifdef CONFIG_CFS_BANDWIDTH
437 {
438 .procname = "sched_cfs_bandwidth_slice_us",
439 .data = &sysctl_sched_cfs_bandwidth_slice,
440 .maxlen = sizeof(unsigned int),
441 .mode = 0644,
442 .proc_handler = proc_dointvec_minmax,
443 .extra1 = &one,
444 },
445 #endif
446 #ifdef CONFIG_PROVE_LOCKING
447 {
448 .procname = "prove_locking",
449 .data = &prove_locking,
450 .maxlen = sizeof(int),
451 .mode = 0644,
452 .proc_handler = proc_dointvec,
453 },
454 #endif
455 #ifdef CONFIG_LOCK_STAT
456 {
457 .procname = "lock_stat",
458 .data = &lock_stat,
459 .maxlen = sizeof(int),
460 .mode = 0644,
461 .proc_handler = proc_dointvec,
462 },
463 #endif
464 {
465 .procname = "panic",
466 .data = &panic_timeout,
467 .maxlen = sizeof(int),
468 .mode = 0644,
469 .proc_handler = proc_dointvec,
470 },
471 #ifdef CONFIG_COREDUMP
472 {
473 .procname = "core_uses_pid",
474 .data = &core_uses_pid,
475 .maxlen = sizeof(int),
476 .mode = 0644,
477 .proc_handler = proc_dointvec,
478 },
479 {
480 .procname = "core_pattern",
481 .data = core_pattern,
482 .maxlen = CORENAME_MAX_SIZE,
483 .mode = 0644,
484 .proc_handler = proc_dostring_coredump,
485 },
486 {
487 .procname = "core_pipe_limit",
488 .data = &core_pipe_limit,
489 .maxlen = sizeof(unsigned int),
490 .mode = 0644,
491 .proc_handler = proc_dointvec,
492 },
493 #endif
494 #ifdef CONFIG_PROC_SYSCTL
495 {
496 .procname = "tainted",
497 .maxlen = sizeof(long),
498 .mode = 0644,
499 .proc_handler = proc_taint,
500 },
501 #endif
502 #ifdef CONFIG_LATENCYTOP
503 {
504 .procname = "latencytop",
505 .data = &latencytop_enabled,
506 .maxlen = sizeof(int),
507 .mode = 0644,
508 .proc_handler = proc_dointvec,
509 },
510 #endif
511 #ifdef CONFIG_BLK_DEV_INITRD
512 {
513 .procname = "real-root-dev",
514 .data = &real_root_dev,
515 .maxlen = sizeof(int),
516 .mode = 0644,
517 .proc_handler = proc_dointvec,
518 },
519 #endif
520 {
521 .procname = "print-fatal-signals",
522 .data = &print_fatal_signals,
523 .maxlen = sizeof(int),
524 .mode = 0644,
525 .proc_handler = proc_dointvec,
526 },
527 #ifdef CONFIG_SPARC
528 {
529 .procname = "reboot-cmd",
530 .data = reboot_command,
531 .maxlen = 256,
532 .mode = 0644,
533 .proc_handler = proc_dostring,
534 },
535 {
536 .procname = "stop-a",
537 .data = &stop_a_enabled,
538 .maxlen = sizeof (int),
539 .mode = 0644,
540 .proc_handler = proc_dointvec,
541 },
542 {
543 .procname = "scons-poweroff",
544 .data = &scons_pwroff,
545 .maxlen = sizeof (int),
546 .mode = 0644,
547 .proc_handler = proc_dointvec,
548 },
549 #endif
550 #ifdef CONFIG_SPARC64
551 {
552 .procname = "tsb-ratio",
553 .data = &sysctl_tsb_ratio,
554 .maxlen = sizeof (int),
555 .mode = 0644,
556 .proc_handler = proc_dointvec,
557 },
558 #endif
559 #ifdef __hppa__
560 {
561 .procname = "soft-power",
562 .data = &pwrsw_enabled,
563 .maxlen = sizeof (int),
564 .mode = 0644,
565 .proc_handler = proc_dointvec,
566 },
567 #endif
568 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
569 {
570 .procname = "unaligned-trap",
571 .data = &unaligned_enabled,
572 .maxlen = sizeof (int),
573 .mode = 0644,
574 .proc_handler = proc_dointvec,
575 },
576 #endif
577 {
578 .procname = "ctrl-alt-del",
579 .data = &C_A_D,
580 .maxlen = sizeof(int),
581 .mode = 0644,
582 .proc_handler = proc_dointvec,
583 },
584 #ifdef CONFIG_FUNCTION_TRACER
585 {
586 .procname = "ftrace_enabled",
587 .data = &ftrace_enabled,
588 .maxlen = sizeof(int),
589 .mode = 0644,
590 .proc_handler = ftrace_enable_sysctl,
591 },
592 #endif
593 #ifdef CONFIG_STACK_TRACER
594 {
595 .procname = "stack_tracer_enabled",
596 .data = &stack_tracer_enabled,
597 .maxlen = sizeof(int),
598 .mode = 0644,
599 .proc_handler = stack_trace_sysctl,
600 },
601 #endif
602 #ifdef CONFIG_TRACING
603 {
604 .procname = "ftrace_dump_on_oops",
605 .data = &ftrace_dump_on_oops,
606 .maxlen = sizeof(int),
607 .mode = 0644,
608 .proc_handler = proc_dointvec,
609 },
610 #endif
611 #ifdef CONFIG_MODULES
612 {
613 .procname = "modprobe",
614 .data = &modprobe_path,
615 .maxlen = KMOD_PATH_LEN,
616 .mode = 0644,
617 .proc_handler = proc_dostring,
618 },
619 {
620 .procname = "modules_disabled",
621 .data = &modules_disabled,
622 .maxlen = sizeof(int),
623 .mode = 0644,
624 /* only handle a transition from default "0" to "1" */
625 .proc_handler = proc_dointvec_minmax,
626 .extra1 = &one,
627 .extra2 = &one,
628 },
629 #endif
630
631 {
632 .procname = "hotplug",
633 .data = &uevent_helper,
634 .maxlen = UEVENT_HELPER_PATH_LEN,
635 .mode = 0644,
636 .proc_handler = proc_dostring,
637 },
638
639 #ifdef CONFIG_CHR_DEV_SG
640 {
641 .procname = "sg-big-buff",
642 .data = &sg_big_buff,
643 .maxlen = sizeof (int),
644 .mode = 0444,
645 .proc_handler = proc_dointvec,
646 },
647 #endif
648 #ifdef CONFIG_BSD_PROCESS_ACCT
649 {
650 .procname = "acct",
651 .data = &acct_parm,
652 .maxlen = 3*sizeof(int),
653 .mode = 0644,
654 .proc_handler = proc_dointvec,
655 },
656 #endif
657 #ifdef CONFIG_MAGIC_SYSRQ
658 {
659 .procname = "sysrq",
660 .data = &__sysrq_enabled,
661 .maxlen = sizeof (int),
662 .mode = 0644,
663 .proc_handler = sysrq_sysctl_handler,
664 },
665 #endif
666 #ifdef CONFIG_PROC_SYSCTL
667 {
668 .procname = "cad_pid",
669 .data = NULL,
670 .maxlen = sizeof (int),
671 .mode = 0600,
672 .proc_handler = proc_do_cad_pid,
673 },
674 #endif
675 {
676 .procname = "threads-max",
677 .data = &max_threads,
678 .maxlen = sizeof(int),
679 .mode = 0644,
680 .proc_handler = proc_dointvec,
681 },
682 {
683 .procname = "random",
684 .mode = 0555,
685 .child = random_table,
686 },
687 {
688 .procname = "usermodehelper",
689 .mode = 0555,
690 .child = usermodehelper_table,
691 },
692 {
693 .procname = "overflowuid",
694 .data = &overflowuid,
695 .maxlen = sizeof(int),
696 .mode = 0644,
697 .proc_handler = proc_dointvec_minmax,
698 .extra1 = &minolduid,
699 .extra2 = &maxolduid,
700 },
701 {
702 .procname = "overflowgid",
703 .data = &overflowgid,
704 .maxlen = sizeof(int),
705 .mode = 0644,
706 .proc_handler = proc_dointvec_minmax,
707 .extra1 = &minolduid,
708 .extra2 = &maxolduid,
709 },
710 #ifdef CONFIG_S390
711 #ifdef CONFIG_MATHEMU
712 {
713 .procname = "ieee_emulation_warnings",
714 .data = &sysctl_ieee_emulation_warnings,
715 .maxlen = sizeof(int),
716 .mode = 0644,
717 .proc_handler = proc_dointvec,
718 },
719 #endif
720 {
721 .procname = "userprocess_debug",
722 .data = &show_unhandled_signals,
723 .maxlen = sizeof(int),
724 .mode = 0644,
725 .proc_handler = proc_dointvec,
726 },
727 #endif
728 {
729 .procname = "pid_max",
730 .data = &pid_max,
731 .maxlen = sizeof (int),
732 .mode = 0644,
733 .proc_handler = proc_dointvec_minmax,
734 .extra1 = &pid_max_min,
735 .extra2 = &pid_max_max,
736 },
737 {
738 .procname = "panic_on_oops",
739 .data = &panic_on_oops,
740 .maxlen = sizeof(int),
741 .mode = 0644,
742 .proc_handler = proc_dointvec,
743 },
744 #if defined CONFIG_PRINTK
745 {
746 .procname = "printk",
747 .data = &console_loglevel,
748 .maxlen = 4*sizeof(int),
749 .mode = 0644,
750 .proc_handler = proc_dointvec,
751 },
752 {
753 .procname = "printk_ratelimit",
754 .data = &printk_ratelimit_state.interval,
755 .maxlen = sizeof(int),
756 .mode = 0644,
757 .proc_handler = proc_dointvec_jiffies,
758 },
759 {
760 .procname = "printk_ratelimit_burst",
761 .data = &printk_ratelimit_state.burst,
762 .maxlen = sizeof(int),
763 .mode = 0644,
764 .proc_handler = proc_dointvec,
765 },
766 {
767 .procname = "printk_delay",
768 .data = &printk_delay_msec,
769 .maxlen = sizeof(int),
770 .mode = 0644,
771 .proc_handler = proc_dointvec_minmax,
772 .extra1 = &zero,
773 .extra2 = &ten_thousand,
774 },
775 {
776 .procname = "dmesg_restrict",
777 .data = &dmesg_restrict,
778 .maxlen = sizeof(int),
779 .mode = 0644,
780 .proc_handler = proc_dointvec_minmax_sysadmin,
781 .extra1 = &zero,
782 .extra2 = &one,
783 },
784 {
785 .procname = "kptr_restrict",
786 .data = &kptr_restrict,
787 .maxlen = sizeof(int),
788 .mode = 0644,
789 .proc_handler = proc_dointvec_minmax_sysadmin,
790 .extra1 = &zero,
791 .extra2 = &two,
792 },
793 #endif
794 {
795 .procname = "ngroups_max",
796 .data = &ngroups_max,
797 .maxlen = sizeof (int),
798 .mode = 0444,
799 .proc_handler = proc_dointvec,
800 },
801 {
802 .procname = "cap_last_cap",
803 .data = (void *)&cap_last_cap,
804 .maxlen = sizeof(int),
805 .mode = 0444,
806 .proc_handler = proc_dointvec,
807 },
808 #if defined(CONFIG_LOCKUP_DETECTOR)
809 {
810 .procname = "watchdog",
811 .data = &watchdog_enabled,
812 .maxlen = sizeof (int),
813 .mode = 0644,
814 .proc_handler = proc_dowatchdog,
815 .extra1 = &zero,
816 .extra2 = &one,
817 },
818 {
819 .procname = "watchdog_thresh",
820 .data = &watchdog_thresh,
821 .maxlen = sizeof(int),
822 .mode = 0644,
823 .proc_handler = proc_dowatchdog,
824 .extra1 = &neg_one,
825 .extra2 = &sixty,
826 },
827 {
828 .procname = "softlockup_panic",
829 .data = &softlockup_panic,
830 .maxlen = sizeof(int),
831 .mode = 0644,
832 .proc_handler = proc_dointvec_minmax,
833 .extra1 = &zero,
834 .extra2 = &one,
835 },
836 {
837 .procname = "nmi_watchdog",
838 .data = &watchdog_enabled,
839 .maxlen = sizeof (int),
840 .mode = 0644,
841 .proc_handler = proc_dowatchdog,
842 .extra1 = &zero,
843 .extra2 = &one,
844 },
845 #endif
846 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
847 {
848 .procname = "unknown_nmi_panic",
849 .data = &unknown_nmi_panic,
850 .maxlen = sizeof (int),
851 .mode = 0644,
852 .proc_handler = proc_dointvec,
853 },
854 #endif
855 #if defined(CONFIG_X86)
856 {
857 .procname = "panic_on_unrecovered_nmi",
858 .data = &panic_on_unrecovered_nmi,
859 .maxlen = sizeof(int),
860 .mode = 0644,
861 .proc_handler = proc_dointvec,
862 },
863 {
864 .procname = "panic_on_io_nmi",
865 .data = &panic_on_io_nmi,
866 .maxlen = sizeof(int),
867 .mode = 0644,
868 .proc_handler = proc_dointvec,
869 },
870 #ifdef CONFIG_DEBUG_STACKOVERFLOW
871 {
872 .procname = "panic_on_stackoverflow",
873 .data = &sysctl_panic_on_stackoverflow,
874 .maxlen = sizeof(int),
875 .mode = 0644,
876 .proc_handler = proc_dointvec,
877 },
878 #endif
879 {
880 .procname = "bootloader_type",
881 .data = &bootloader_type,
882 .maxlen = sizeof (int),
883 .mode = 0444,
884 .proc_handler = proc_dointvec,
885 },
886 {
887 .procname = "bootloader_version",
888 .data = &bootloader_version,
889 .maxlen = sizeof (int),
890 .mode = 0444,
891 .proc_handler = proc_dointvec,
892 },
893 {
894 .procname = "kstack_depth_to_print",
895 .data = &kstack_depth_to_print,
896 .maxlen = sizeof(int),
897 .mode = 0644,
898 .proc_handler = proc_dointvec,
899 },
900 {
901 .procname = "io_delay_type",
902 .data = &io_delay_type,
903 .maxlen = sizeof(int),
904 .mode = 0644,
905 .proc_handler = proc_dointvec,
906 },
907 #endif
908 #if defined(CONFIG_MMU)
909 {
910 .procname = "randomize_va_space",
911 .data = &randomize_va_space,
912 .maxlen = sizeof(int),
913 .mode = 0644,
914 .proc_handler = proc_dointvec,
915 },
916 #endif
917 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
918 {
919 .procname = "spin_retry",
920 .data = &spin_retry,
921 .maxlen = sizeof (int),
922 .mode = 0644,
923 .proc_handler = proc_dointvec,
924 },
925 #endif
926 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
927 {
928 .procname = "acpi_video_flags",
929 .data = &acpi_realmode_flags,
930 .maxlen = sizeof (unsigned long),
931 .mode = 0644,
932 .proc_handler = proc_doulongvec_minmax,
933 },
934 #endif
935 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
936 {
937 .procname = "ignore-unaligned-usertrap",
938 .data = &no_unaligned_warning,
939 .maxlen = sizeof (int),
940 .mode = 0644,
941 .proc_handler = proc_dointvec,
942 },
943 #endif
944 #ifdef CONFIG_IA64
945 {
946 .procname = "unaligned-dump-stack",
947 .data = &unaligned_dump_stack,
948 .maxlen = sizeof (int),
949 .mode = 0644,
950 .proc_handler = proc_dointvec,
951 },
952 #endif
953 #ifdef CONFIG_DETECT_HUNG_TASK
954 {
955 .procname = "hung_task_panic",
956 .data = &sysctl_hung_task_panic,
957 .maxlen = sizeof(int),
958 .mode = 0644,
959 .proc_handler = proc_dointvec_minmax,
960 .extra1 = &zero,
961 .extra2 = &one,
962 },
963 {
964 .procname = "hung_task_check_count",
965 .data = &sysctl_hung_task_check_count,
966 .maxlen = sizeof(unsigned long),
967 .mode = 0644,
968 .proc_handler = proc_doulongvec_minmax,
969 },
970 {
971 .procname = "hung_task_timeout_secs",
972 .data = &sysctl_hung_task_timeout_secs,
973 .maxlen = sizeof(unsigned long),
974 .mode = 0644,
975 .proc_handler = proc_dohung_task_timeout_secs,
976 .extra2 = &hung_task_timeout_max,
977 },
978 {
979 .procname = "hung_task_warnings",
980 .data = &sysctl_hung_task_warnings,
981 .maxlen = sizeof(unsigned long),
982 .mode = 0644,
983 .proc_handler = proc_doulongvec_minmax,
984 },
985 #endif
986 #ifdef CONFIG_COMPAT
987 {
988 .procname = "compat-log",
989 .data = &compat_log,
990 .maxlen = sizeof (int),
991 .mode = 0644,
992 .proc_handler = proc_dointvec,
993 },
994 #endif
995 #ifdef CONFIG_RT_MUTEXES
996 {
997 .procname = "max_lock_depth",
998 .data = &max_lock_depth,
999 .maxlen = sizeof(int),
1000 .mode = 0644,
1001 .proc_handler = proc_dointvec,
1002 },
1003 #endif
1004 {
1005 .procname = "poweroff_cmd",
1006 .data = &poweroff_cmd,
1007 .maxlen = POWEROFF_CMD_PATH_LEN,
1008 .mode = 0644,
1009 .proc_handler = proc_dostring,
1010 },
1011 #ifdef CONFIG_KEYS
1012 {
1013 .procname = "keys",
1014 .mode = 0555,
1015 .child = key_sysctls,
1016 },
1017 #endif
1018 #ifdef CONFIG_RCU_TORTURE_TEST
1019 {
1020 .procname = "rcutorture_runnable",
1021 .data = &rcutorture_runnable,
1022 .maxlen = sizeof(int),
1023 .mode = 0644,
1024 .proc_handler = proc_dointvec,
1025 },
1026 #endif
1027 #ifdef CONFIG_PERF_EVENTS
1028 /*
1029 * User-space scripts rely on the existence of this file
1030 * as a feature check for perf_events being enabled.
1031 *
1032 * So it's an ABI, do not remove!
1033 */
1034 {
1035 .procname = "perf_event_paranoid",
1036 .data = &sysctl_perf_event_paranoid,
1037 .maxlen = sizeof(sysctl_perf_event_paranoid),
1038 .mode = 0644,
1039 .proc_handler = proc_dointvec,
1040 },
1041 {
1042 .procname = "perf_event_mlock_kb",
1043 .data = &sysctl_perf_event_mlock,
1044 .maxlen = sizeof(sysctl_perf_event_mlock),
1045 .mode = 0644,
1046 .proc_handler = proc_dointvec,
1047 },
1048 {
1049 .procname = "perf_event_max_sample_rate",
1050 .data = &sysctl_perf_event_sample_rate,
1051 .maxlen = sizeof(sysctl_perf_event_sample_rate),
1052 .mode = 0644,
1053 .proc_handler = perf_proc_update_handler,
1054 .extra1 = &one,
1055 },
1056 {
1057 .procname = "perf_cpu_time_max_percent",
1058 .data = &sysctl_perf_cpu_time_max_percent,
1059 .maxlen = sizeof(sysctl_perf_cpu_time_max_percent),
1060 .mode = 0644,
1061 .proc_handler = perf_cpu_time_max_percent_handler,
1062 .extra1 = &zero,
1063 .extra2 = &one_hundred,
1064 },
1065 #endif
1066 #ifdef CONFIG_KMEMCHECK
1067 {
1068 .procname = "kmemcheck",
1069 .data = &kmemcheck_enabled,
1070 .maxlen = sizeof(int),
1071 .mode = 0644,
1072 .proc_handler = proc_dointvec,
1073 },
1074 #endif
1075 #ifdef CONFIG_BLOCK
1076 {
1077 .procname = "blk_iopoll",
1078 .data = &blk_iopoll_enabled,
1079 .maxlen = sizeof(int),
1080 .mode = 0644,
1081 .proc_handler = proc_dointvec,
1082 },
1083 #endif
1084 { }
1085 };
1086
1087 static struct ctl_table vm_table[] = {
1088 {
1089 .procname = "overcommit_memory",
1090 .data = &sysctl_overcommit_memory,
1091 .maxlen = sizeof(sysctl_overcommit_memory),
1092 .mode = 0644,
1093 .proc_handler = proc_dointvec_minmax,
1094 .extra1 = &zero,
1095 .extra2 = &two,
1096 },
1097 {
1098 .procname = "panic_on_oom",
1099 .data = &sysctl_panic_on_oom,
1100 .maxlen = sizeof(sysctl_panic_on_oom),
1101 .mode = 0644,
1102 .proc_handler = proc_dointvec_minmax,
1103 .extra1 = &zero,
1104 .extra2 = &two,
1105 },
1106 {
1107 .procname = "oom_kill_allocating_task",
1108 .data = &sysctl_oom_kill_allocating_task,
1109 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
1110 .mode = 0644,
1111 .proc_handler = proc_dointvec,
1112 },
1113 {
1114 .procname = "oom_dump_tasks",
1115 .data = &sysctl_oom_dump_tasks,
1116 .maxlen = sizeof(sysctl_oom_dump_tasks),
1117 .mode = 0644,
1118 .proc_handler = proc_dointvec,
1119 },
1120 {
1121 .procname = "overcommit_ratio",
1122 .data = &sysctl_overcommit_ratio,
1123 .maxlen = sizeof(sysctl_overcommit_ratio),
1124 .mode = 0644,
1125 .proc_handler = proc_dointvec,
1126 },
1127 {
1128 .procname = "page-cluster",
1129 .data = &page_cluster,
1130 .maxlen = sizeof(int),
1131 .mode = 0644,
1132 .proc_handler = proc_dointvec_minmax,
1133 .extra1 = &zero,
1134 },
1135 {
1136 .procname = "dirty_background_ratio",
1137 .data = &dirty_background_ratio,
1138 .maxlen = sizeof(dirty_background_ratio),
1139 .mode = 0644,
1140 .proc_handler = dirty_background_ratio_handler,
1141 .extra1 = &zero,
1142 .extra2 = &one_hundred,
1143 },
1144 {
1145 .procname = "dirty_background_bytes",
1146 .data = &dirty_background_bytes,
1147 .maxlen = sizeof(dirty_background_bytes),
1148 .mode = 0644,
1149 .proc_handler = dirty_background_bytes_handler,
1150 .extra1 = &one_ul,
1151 },
1152 {
1153 .procname = "dirty_ratio",
1154 .data = &vm_dirty_ratio,
1155 .maxlen = sizeof(vm_dirty_ratio),
1156 .mode = 0644,
1157 .proc_handler = dirty_ratio_handler,
1158 .extra1 = &zero,
1159 .extra2 = &one_hundred,
1160 },
1161 {
1162 .procname = "dirty_bytes",
1163 .data = &vm_dirty_bytes,
1164 .maxlen = sizeof(vm_dirty_bytes),
1165 .mode = 0644,
1166 .proc_handler = dirty_bytes_handler,
1167 .extra1 = &dirty_bytes_min,
1168 },
1169 {
1170 .procname = "dirty_writeback_centisecs",
1171 .data = &dirty_writeback_interval,
1172 .maxlen = sizeof(dirty_writeback_interval),
1173 .mode = 0644,
1174 .proc_handler = dirty_writeback_centisecs_handler,
1175 },
1176 {
1177 .procname = "dirty_expire_centisecs",
1178 .data = &dirty_expire_interval,
1179 .maxlen = sizeof(dirty_expire_interval),
1180 .mode = 0644,
1181 .proc_handler = proc_dointvec_minmax,
1182 .extra1 = &zero,
1183 },
1184 {
1185 .procname = "nr_pdflush_threads",
1186 .mode = 0444 /* read-only */,
1187 .proc_handler = pdflush_proc_obsolete,
1188 },
1189 {
1190 .procname = "swappiness",
1191 .data = &vm_swappiness,
1192 .maxlen = sizeof(vm_swappiness),
1193 .mode = 0644,
1194 .proc_handler = proc_dointvec_minmax,
1195 .extra1 = &zero,
1196 .extra2 = &one_hundred,
1197 },
1198 #ifdef CONFIG_HUGETLB_PAGE
1199 {
1200 .procname = "nr_hugepages",
1201 .data = NULL,
1202 .maxlen = sizeof(unsigned long),
1203 .mode = 0644,
1204 .proc_handler = hugetlb_sysctl_handler,
1205 .extra1 = (void *)&hugetlb_zero,
1206 .extra2 = (void *)&hugetlb_infinity,
1207 },
1208 #ifdef CONFIG_NUMA
1209 {
1210 .procname = "nr_hugepages_mempolicy",
1211 .data = NULL,
1212 .maxlen = sizeof(unsigned long),
1213 .mode = 0644,
1214 .proc_handler = &hugetlb_mempolicy_sysctl_handler,
1215 .extra1 = (void *)&hugetlb_zero,
1216 .extra2 = (void *)&hugetlb_infinity,
1217 },
1218 #endif
1219 {
1220 .procname = "hugetlb_shm_group",
1221 .data = &sysctl_hugetlb_shm_group,
1222 .maxlen = sizeof(gid_t),
1223 .mode = 0644,
1224 .proc_handler = proc_dointvec,
1225 },
1226 {
1227 .procname = "hugepages_treat_as_movable",
1228 .data = &hugepages_treat_as_movable,
1229 .maxlen = sizeof(int),
1230 .mode = 0644,
1231 .proc_handler = hugetlb_treat_movable_handler,
1232 },
1233 {
1234 .procname = "nr_overcommit_hugepages",
1235 .data = NULL,
1236 .maxlen = sizeof(unsigned long),
1237 .mode = 0644,
1238 .proc_handler = hugetlb_overcommit_handler,
1239 .extra1 = (void *)&hugetlb_zero,
1240 .extra2 = (void *)&hugetlb_infinity,
1241 },
1242 #endif
1243 {
1244 .procname = "lowmem_reserve_ratio",
1245 .data = &sysctl_lowmem_reserve_ratio,
1246 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1247 .mode = 0644,
1248 .proc_handler = lowmem_reserve_ratio_sysctl_handler,
1249 },
1250 {
1251 .procname = "drop_caches",
1252 .data = &sysctl_drop_caches,
1253 .maxlen = sizeof(int),
1254 .mode = 0644,
1255 .proc_handler = drop_caches_sysctl_handler,
1256 .extra1 = &one,
1257 .extra2 = &three,
1258 },
1259 #ifdef CONFIG_COMPACTION
1260 {
1261 .procname = "compact_memory",
1262 .data = &sysctl_compact_memory,
1263 .maxlen = sizeof(int),
1264 .mode = 0200,
1265 .proc_handler = sysctl_compaction_handler,
1266 },
1267 {
1268 .procname = "extfrag_threshold",
1269 .data = &sysctl_extfrag_threshold,
1270 .maxlen = sizeof(int),
1271 .mode = 0644,
1272 .proc_handler = sysctl_extfrag_handler,
1273 .extra1 = &min_extfrag_threshold,
1274 .extra2 = &max_extfrag_threshold,
1275 },
1276
1277 #endif /* CONFIG_COMPACTION */
1278 {
1279 .procname = "min_free_kbytes",
1280 .data = &min_free_kbytes,
1281 .maxlen = sizeof(min_free_kbytes),
1282 .mode = 0644,
1283 .proc_handler = min_free_kbytes_sysctl_handler,
1284 .extra1 = &zero,
1285 },
1286 {
1287 .procname = "extra_free_kbytes",
1288 .data = &extra_free_kbytes,
1289 .maxlen = sizeof(extra_free_kbytes),
1290 .mode = 0644,
1291 .proc_handler = min_free_kbytes_sysctl_handler,
1292 .extra1 = &zero,
1293 },
1294 {
1295 .procname = "min_free_order_shift",
1296 .data = &min_free_order_shift,
1297 .maxlen = sizeof(min_free_order_shift),
1298 .mode = 0644,
1299 .proc_handler = &proc_dointvec
1300 },
1301 {
1302 .procname = "percpu_pagelist_fraction",
1303 .data = &percpu_pagelist_fraction,
1304 .maxlen = sizeof(percpu_pagelist_fraction),
1305 .mode = 0644,
1306 .proc_handler = percpu_pagelist_fraction_sysctl_handler,
1307 .extra1 = &min_percpu_pagelist_fract,
1308 },
1309 #ifdef CONFIG_MMU
1310 {
1311 .procname = "max_map_count",
1312 .data = &sysctl_max_map_count,
1313 .maxlen = sizeof(sysctl_max_map_count),
1314 .mode = 0644,
1315 .proc_handler = proc_dointvec_minmax,
1316 .extra1 = &zero,
1317 },
1318 #else
1319 {
1320 .procname = "nr_trim_pages",
1321 .data = &sysctl_nr_trim_pages,
1322 .maxlen = sizeof(sysctl_nr_trim_pages),
1323 .mode = 0644,
1324 .proc_handler = proc_dointvec_minmax,
1325 .extra1 = &zero,
1326 },
1327 #endif
1328 {
1329 .procname = "laptop_mode",
1330 .data = &laptop_mode,
1331 .maxlen = sizeof(laptop_mode),
1332 .mode = 0644,
1333 .proc_handler = proc_dointvec_jiffies,
1334 },
1335 {
1336 .procname = "block_dump",
1337 .data = &block_dump,
1338 .maxlen = sizeof(block_dump),
1339 .mode = 0644,
1340 .proc_handler = proc_dointvec,
1341 .extra1 = &zero,
1342 },
1343 {
1344 .procname = "vfs_cache_pressure",
1345 .data = &sysctl_vfs_cache_pressure,
1346 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1347 .mode = 0644,
1348 .proc_handler = proc_dointvec,
1349 .extra1 = &zero,
1350 },
1351 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1352 {
1353 .procname = "legacy_va_layout",
1354 .data = &sysctl_legacy_va_layout,
1355 .maxlen = sizeof(sysctl_legacy_va_layout),
1356 .mode = 0644,
1357 .proc_handler = proc_dointvec,
1358 .extra1 = &zero,
1359 },
1360 #endif
1361 #ifdef CONFIG_NUMA
1362 {
1363 .procname = "zone_reclaim_mode",
1364 .data = &zone_reclaim_mode,
1365 .maxlen = sizeof(zone_reclaim_mode),
1366 .mode = 0644,
1367 .proc_handler = proc_dointvec,
1368 .extra1 = &zero,
1369 },
1370 {
1371 .procname = "min_unmapped_ratio",
1372 .data = &sysctl_min_unmapped_ratio,
1373 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1374 .mode = 0644,
1375 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler,
1376 .extra1 = &zero,
1377 .extra2 = &one_hundred,
1378 },
1379 {
1380 .procname = "min_slab_ratio",
1381 .data = &sysctl_min_slab_ratio,
1382 .maxlen = sizeof(sysctl_min_slab_ratio),
1383 .mode = 0644,
1384 .proc_handler = sysctl_min_slab_ratio_sysctl_handler,
1385 .extra1 = &zero,
1386 .extra2 = &one_hundred,
1387 },
1388 #endif
1389 #ifdef CONFIG_SMP
1390 {
1391 .procname = "stat_interval",
1392 .data = &sysctl_stat_interval,
1393 .maxlen = sizeof(sysctl_stat_interval),
1394 .mode = 0644,
1395 .proc_handler = proc_dointvec_jiffies,
1396 },
1397 #endif
1398 #ifdef CONFIG_MMU
1399 {
1400 .procname = "mmap_min_addr",
1401 .data = &dac_mmap_min_addr,
1402 .maxlen = sizeof(unsigned long),
1403 .mode = 0644,
1404 .proc_handler = mmap_min_addr_handler,
1405 },
1406 #endif
1407 #ifdef CONFIG_NUMA
1408 {
1409 .procname = "numa_zonelist_order",
1410 .data = &numa_zonelist_order,
1411 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1412 .mode = 0644,
1413 .proc_handler = numa_zonelist_order_handler,
1414 },
1415 #endif
1416 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1417 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1418 {
1419 .procname = "vdso_enabled",
1420 .data = &vdso_enabled,
1421 .maxlen = sizeof(vdso_enabled),
1422 .mode = 0644,
1423 .proc_handler = proc_dointvec,
1424 .extra1 = &zero,
1425 },
1426 #endif
1427 #ifdef CONFIG_HIGHMEM
1428 {
1429 .procname = "highmem_is_dirtyable",
1430 .data = &vm_highmem_is_dirtyable,
1431 .maxlen = sizeof(vm_highmem_is_dirtyable),
1432 .mode = 0644,
1433 .proc_handler = proc_dointvec_minmax,
1434 .extra1 = &zero,
1435 .extra2 = &one,
1436 },
1437 #endif
1438 {
1439 .procname = "scan_unevictable_pages",
1440 .data = &scan_unevictable_pages,
1441 .maxlen = sizeof(scan_unevictable_pages),
1442 .mode = 0644,
1443 .proc_handler = scan_unevictable_handler,
1444 },
1445 #ifdef CONFIG_MEMORY_FAILURE
1446 {
1447 .procname = "memory_failure_early_kill",
1448 .data = &sysctl_memory_failure_early_kill,
1449 .maxlen = sizeof(sysctl_memory_failure_early_kill),
1450 .mode = 0644,
1451 .proc_handler = proc_dointvec_minmax,
1452 .extra1 = &zero,
1453 .extra2 = &one,
1454 },
1455 {
1456 .procname = "memory_failure_recovery",
1457 .data = &sysctl_memory_failure_recovery,
1458 .maxlen = sizeof(sysctl_memory_failure_recovery),
1459 .mode = 0644,
1460 .proc_handler = proc_dointvec_minmax,
1461 .extra1 = &zero,
1462 .extra2 = &one,
1463 },
1464 #endif
1465 {
1466 .procname = "user_reserve_kbytes",
1467 .data = &sysctl_user_reserve_kbytes,
1468 .maxlen = sizeof(sysctl_user_reserve_kbytes),
1469 .mode = 0644,
1470 .proc_handler = proc_doulongvec_minmax,
1471 },
1472 {
1473 .procname = "admin_reserve_kbytes",
1474 .data = &sysctl_admin_reserve_kbytes,
1475 .maxlen = sizeof(sysctl_admin_reserve_kbytes),
1476 .mode = 0644,
1477 .proc_handler = proc_doulongvec_minmax,
1478 },
1479 { }
1480 };
1481
1482 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1483 static struct ctl_table binfmt_misc_table[] = {
1484 { }
1485 };
1486 #endif
1487
1488 static struct ctl_table fs_table[] = {
1489 {
1490 .procname = "inode-nr",
1491 .data = &inodes_stat,
1492 .maxlen = 2*sizeof(int),
1493 .mode = 0444,
1494 .proc_handler = proc_nr_inodes,
1495 },
1496 {
1497 .procname = "inode-state",
1498 .data = &inodes_stat,
1499 .maxlen = 7*sizeof(int),
1500 .mode = 0444,
1501 .proc_handler = proc_nr_inodes,
1502 },
1503 {
1504 .procname = "file-nr",
1505 .data = &files_stat,
1506 .maxlen = sizeof(files_stat),
1507 .mode = 0444,
1508 .proc_handler = proc_nr_files,
1509 },
1510 {
1511 .procname = "file-max",
1512 .data = &files_stat.max_files,
1513 .maxlen = sizeof(files_stat.max_files),
1514 .mode = 0644,
1515 .proc_handler = proc_doulongvec_minmax,
1516 },
1517 {
1518 .procname = "nr_open",
1519 .data = &sysctl_nr_open,
1520 .maxlen = sizeof(int),
1521 .mode = 0644,
1522 .proc_handler = proc_dointvec_minmax,
1523 .extra1 = &sysctl_nr_open_min,
1524 .extra2 = &sysctl_nr_open_max,
1525 },
1526 {
1527 .procname = "dentry-state",
1528 .data = &dentry_stat,
1529 .maxlen = 6*sizeof(int),
1530 .mode = 0444,
1531 .proc_handler = proc_nr_dentry,
1532 },
1533 {
1534 .procname = "overflowuid",
1535 .data = &fs_overflowuid,
1536 .maxlen = sizeof(int),
1537 .mode = 0644,
1538 .proc_handler = proc_dointvec_minmax,
1539 .extra1 = &minolduid,
1540 .extra2 = &maxolduid,
1541 },
1542 {
1543 .procname = "overflowgid",
1544 .data = &fs_overflowgid,
1545 .maxlen = sizeof(int),
1546 .mode = 0644,
1547 .proc_handler = proc_dointvec_minmax,
1548 .extra1 = &minolduid,
1549 .extra2 = &maxolduid,
1550 },
1551 #ifdef CONFIG_FILE_LOCKING
1552 {
1553 .procname = "leases-enable",
1554 .data = &leases_enable,
1555 .maxlen = sizeof(int),
1556 .mode = 0644,
1557 .proc_handler = proc_dointvec,
1558 },
1559 #endif
1560 #ifdef CONFIG_DNOTIFY
1561 {
1562 .procname = "dir-notify-enable",
1563 .data = &dir_notify_enable,
1564 .maxlen = sizeof(int),
1565 .mode = 0644,
1566 .proc_handler = proc_dointvec,
1567 },
1568 #endif
1569 #ifdef CONFIG_MMU
1570 #ifdef CONFIG_FILE_LOCKING
1571 {
1572 .procname = "lease-break-time",
1573 .data = &lease_break_time,
1574 .maxlen = sizeof(int),
1575 .mode = 0644,
1576 .proc_handler = proc_dointvec,
1577 },
1578 #endif
1579 #ifdef CONFIG_AIO
1580 {
1581 .procname = "aio-nr",
1582 .data = &aio_nr,
1583 .maxlen = sizeof(aio_nr),
1584 .mode = 0444,
1585 .proc_handler = proc_doulongvec_minmax,
1586 },
1587 {
1588 .procname = "aio-max-nr",
1589 .data = &aio_max_nr,
1590 .maxlen = sizeof(aio_max_nr),
1591 .mode = 0644,
1592 .proc_handler = proc_doulongvec_minmax,
1593 },
1594 #endif /* CONFIG_AIO */
1595 #ifdef CONFIG_INOTIFY_USER
1596 {
1597 .procname = "inotify",
1598 .mode = 0555,
1599 .child = inotify_table,
1600 },
1601 #endif
1602 #ifdef CONFIG_EPOLL
1603 {
1604 .procname = "epoll",
1605 .mode = 0555,
1606 .child = epoll_table,
1607 },
1608 #endif
1609 #endif
1610 {
1611 .procname = "protected_symlinks",
1612 .data = &sysctl_protected_symlinks,
1613 .maxlen = sizeof(int),
1614 .mode = 0600,
1615 .proc_handler = proc_dointvec_minmax,
1616 .extra1 = &zero,
1617 .extra2 = &one,
1618 },
1619 {
1620 .procname = "protected_hardlinks",
1621 .data = &sysctl_protected_hardlinks,
1622 .maxlen = sizeof(int),
1623 .mode = 0600,
1624 .proc_handler = proc_dointvec_minmax,
1625 .extra1 = &zero,
1626 .extra2 = &one,
1627 },
1628 {
1629 .procname = "suid_dumpable",
1630 .data = &suid_dumpable,
1631 .maxlen = sizeof(int),
1632 .mode = 0644,
1633 .proc_handler = proc_dointvec_minmax_coredump,
1634 .extra1 = &zero,
1635 .extra2 = &two,
1636 },
1637 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1638 {
1639 .procname = "binfmt_misc",
1640 .mode = 0555,
1641 .child = binfmt_misc_table,
1642 },
1643 #endif
1644 {
1645 .procname = "pipe-max-size",
1646 .data = &pipe_max_size,
1647 .maxlen = sizeof(int),
1648 .mode = 0644,
1649 .proc_handler = &pipe_proc_fn,
1650 .extra1 = &pipe_min_size,
1651 },
1652 {
1653 .procname = "pipe-user-pages-hard",
1654 .data = &pipe_user_pages_hard,
1655 .maxlen = sizeof(pipe_user_pages_hard),
1656 .mode = 0644,
1657 .proc_handler = proc_doulongvec_minmax,
1658 },
1659 {
1660 .procname = "pipe-user-pages-soft",
1661 .data = &pipe_user_pages_soft,
1662 .maxlen = sizeof(pipe_user_pages_soft),
1663 .mode = 0644,
1664 .proc_handler = proc_doulongvec_minmax,
1665 },
1666 { }
1667 };
1668
1669 static struct ctl_table debug_table[] = {
1670 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
1671 {
1672 .procname = "exception-trace",
1673 .data = &show_unhandled_signals,
1674 .maxlen = sizeof(int),
1675 .mode = 0644,
1676 .proc_handler = proc_dointvec
1677 },
1678 #endif
1679 #if defined(CONFIG_OPTPROBES)
1680 {
1681 .procname = "kprobes-optimization",
1682 .data = &sysctl_kprobes_optimization,
1683 .maxlen = sizeof(int),
1684 .mode = 0644,
1685 .proc_handler = proc_kprobes_optimization_handler,
1686 .extra1 = &zero,
1687 .extra2 = &one,
1688 },
1689 #endif
1690 { }
1691 };
1692
1693 static struct ctl_table dev_table[] = {
1694 { }
1695 };
1696
1697 int __init sysctl_init(void)
1698 {
1699 struct ctl_table_header *hdr;
1700
1701 hdr = register_sysctl_table(sysctl_base_table);
1702 kmemleak_not_leak(hdr);
1703 return 0;
1704 }
1705
1706 #endif /* CONFIG_SYSCTL */
1707
1708 /*
1709 * /proc/sys support
1710 */
1711
1712 #ifdef CONFIG_PROC_SYSCTL
1713
1714 static int _proc_do_string(void* data, int maxlen, int write,
1715 void __user *buffer,
1716 size_t *lenp, loff_t *ppos)
1717 {
1718 size_t len;
1719 char __user *p;
1720 char c;
1721
1722 if (!data || !maxlen || !*lenp) {
1723 *lenp = 0;
1724 return 0;
1725 }
1726
1727 if (write) {
1728 len = 0;
1729 p = buffer;
1730 while (len < *lenp) {
1731 if (get_user(c, p))
1732 return -EFAULT;
1733 if (c == 0 || c == '\n')
1734 break;
1735 p++;
1736 len++;
1737 }
1738 if (len >= maxlen)
1739 len = maxlen-1;
1740 if(copy_from_user(data, buffer, len))
1741 return -EFAULT;
1742 ((char *) data)[len] = 0;
1743 *ppos += *lenp;
1744 } else {
1745 len = strlen(data);
1746 if (len > maxlen)
1747 len = maxlen;
1748
1749 if (*ppos > len) {
1750 *lenp = 0;
1751 return 0;
1752 }
1753
1754 data += *ppos;
1755 len -= *ppos;
1756
1757 if (len > *lenp)
1758 len = *lenp;
1759 if (len)
1760 if(copy_to_user(buffer, data, len))
1761 return -EFAULT;
1762 if (len < *lenp) {
1763 if(put_user('\n', ((char __user *) buffer) + len))
1764 return -EFAULT;
1765 len++;
1766 }
1767 *lenp = len;
1768 *ppos += len;
1769 }
1770 return 0;
1771 }
1772
1773 /**
1774 * proc_dostring - read a string sysctl
1775 * @table: the sysctl table
1776 * @write: %TRUE if this is a write to the sysctl file
1777 * @buffer: the user buffer
1778 * @lenp: the size of the user buffer
1779 * @ppos: file position
1780 *
1781 * Reads/writes a string from/to the user buffer. If the kernel
1782 * buffer provided is not large enough to hold the string, the
1783 * string is truncated. The copied string is %NULL-terminated.
1784 * If the string is being read by the user process, it is copied
1785 * and a newline '\n' is added. It is truncated if the buffer is
1786 * not large enough.
1787 *
1788 * Returns 0 on success.
1789 */
1790 int proc_dostring(struct ctl_table *table, int write,
1791 void __user *buffer, size_t *lenp, loff_t *ppos)
1792 {
1793 return _proc_do_string(table->data, table->maxlen, write,
1794 buffer, lenp, ppos);
1795 }
1796
1797 static size_t proc_skip_spaces(char **buf)
1798 {
1799 size_t ret;
1800 char *tmp = skip_spaces(*buf);
1801 ret = tmp - *buf;
1802 *buf = tmp;
1803 return ret;
1804 }
1805
1806 static void proc_skip_char(char **buf, size_t *size, const char v)
1807 {
1808 while (*size) {
1809 if (**buf != v)
1810 break;
1811 (*size)--;
1812 (*buf)++;
1813 }
1814 }
1815
1816 #define TMPBUFLEN 22
1817 /**
1818 * proc_get_long - reads an ASCII formatted integer from a user buffer
1819 *
1820 * @buf: a kernel buffer
1821 * @size: size of the kernel buffer
1822 * @val: this is where the number will be stored
1823 * @neg: set to %TRUE if number is negative
1824 * @perm_tr: a vector which contains the allowed trailers
1825 * @perm_tr_len: size of the perm_tr vector
1826 * @tr: pointer to store the trailer character
1827 *
1828 * In case of success %0 is returned and @buf and @size are updated with
1829 * the amount of bytes read. If @tr is non-NULL and a trailing
1830 * character exists (size is non-zero after returning from this
1831 * function), @tr is updated with the trailing character.
1832 */
1833 static int proc_get_long(char **buf, size_t *size,
1834 unsigned long *val, bool *neg,
1835 const char *perm_tr, unsigned perm_tr_len, char *tr)
1836 {
1837 int len;
1838 char *p, tmp[TMPBUFLEN];
1839
1840 if (!*size)
1841 return -EINVAL;
1842
1843 len = *size;
1844 if (len > TMPBUFLEN - 1)
1845 len = TMPBUFLEN - 1;
1846
1847 memcpy(tmp, *buf, len);
1848
1849 tmp[len] = 0;
1850 p = tmp;
1851 if (*p == '-' && *size > 1) {
1852 *neg = true;
1853 p++;
1854 } else
1855 *neg = false;
1856 if (!isdigit(*p))
1857 return -EINVAL;
1858
1859 *val = simple_strtoul(p, &p, 0);
1860
1861 len = p - tmp;
1862
1863 /* We don't know if the next char is whitespace thus we may accept
1864 * invalid integers (e.g. 1234...a) or two integers instead of one
1865 * (e.g. 123...1). So lets not allow such large numbers. */
1866 if (len == TMPBUFLEN - 1)
1867 return -EINVAL;
1868
1869 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
1870 return -EINVAL;
1871
1872 if (tr && (len < *size))
1873 *tr = *p;
1874
1875 *buf += len;
1876 *size -= len;
1877
1878 return 0;
1879 }
1880
1881 /**
1882 * proc_put_long - converts an integer to a decimal ASCII formatted string
1883 *
1884 * @buf: the user buffer
1885 * @size: the size of the user buffer
1886 * @val: the integer to be converted
1887 * @neg: sign of the number, %TRUE for negative
1888 *
1889 * In case of success %0 is returned and @buf and @size are updated with
1890 * the amount of bytes written.
1891 */
1892 static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
1893 bool neg)
1894 {
1895 int len;
1896 char tmp[TMPBUFLEN], *p = tmp;
1897
1898 sprintf(p, "%s%lu", neg ? "-" : "", val);
1899 len = strlen(tmp);
1900 if (len > *size)
1901 len = *size;
1902 if (copy_to_user(*buf, tmp, len))
1903 return -EFAULT;
1904 *size -= len;
1905 *buf += len;
1906 return 0;
1907 }
1908 #undef TMPBUFLEN
1909
1910 static int proc_put_char(void __user **buf, size_t *size, char c)
1911 {
1912 if (*size) {
1913 char __user **buffer = (char __user **)buf;
1914 if (put_user(c, *buffer))
1915 return -EFAULT;
1916 (*size)--, (*buffer)++;
1917 *buf = *buffer;
1918 }
1919 return 0;
1920 }
1921
1922 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
1923 int *valp,
1924 int write, void *data)
1925 {
1926 if (write) {
1927 *valp = *negp ? -*lvalp : *lvalp;
1928 } else {
1929 int val = *valp;
1930 if (val < 0) {
1931 *negp = true;
1932 *lvalp = (unsigned long)-val;
1933 } else {
1934 *negp = false;
1935 *lvalp = (unsigned long)val;
1936 }
1937 }
1938 return 0;
1939 }
1940
1941 static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
1942
1943 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
1944 int write, void __user *buffer,
1945 size_t *lenp, loff_t *ppos,
1946 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
1947 int write, void *data),
1948 void *data)
1949 {
1950 int *i, vleft, first = 1, err = 0;
1951 unsigned long page = 0;
1952 size_t left;
1953 char *kbuf;
1954
1955 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
1956 *lenp = 0;
1957 return 0;
1958 }
1959
1960 i = (int *) tbl_data;
1961 vleft = table->maxlen / sizeof(*i);
1962 left = *lenp;
1963
1964 if (!conv)
1965 conv = do_proc_dointvec_conv;
1966
1967 if (write) {
1968 if (left > PAGE_SIZE - 1)
1969 left = PAGE_SIZE - 1;
1970 page = __get_free_page(GFP_TEMPORARY);
1971 kbuf = (char *) page;
1972 if (!kbuf)
1973 return -ENOMEM;
1974 if (copy_from_user(kbuf, buffer, left)) {
1975 err = -EFAULT;
1976 goto free;
1977 }
1978 kbuf[left] = 0;
1979 }
1980
1981 for (; left && vleft--; i++, first=0) {
1982 unsigned long lval;
1983 bool neg;
1984
1985 if (write) {
1986 left -= proc_skip_spaces(&kbuf);
1987
1988 if (!left)
1989 break;
1990 err = proc_get_long(&kbuf, &left, &lval, &neg,
1991 proc_wspace_sep,
1992 sizeof(proc_wspace_sep), NULL);
1993 if (err)
1994 break;
1995 if (conv(&neg, &lval, i, 1, data)) {
1996 err = -EINVAL;
1997 break;
1998 }
1999 } else {
2000 if (conv(&neg, &lval, i, 0, data)) {
2001 err = -EINVAL;
2002 break;
2003 }
2004 if (!first)
2005 err = proc_put_char(&buffer, &left, '\t');
2006 if (err)
2007 break;
2008 err = proc_put_long(&buffer, &left, lval, neg);
2009 if (err)
2010 break;
2011 }
2012 }
2013
2014 if (!write && !first && left && !err)
2015 err = proc_put_char(&buffer, &left, '\n');
2016 if (write && !err && left)
2017 left -= proc_skip_spaces(&kbuf);
2018 free:
2019 if (write) {
2020 free_page(page);
2021 if (first)
2022 return err ? : -EINVAL;
2023 }
2024 *lenp -= left;
2025 *ppos += *lenp;
2026 return err;
2027 }
2028
2029 static int do_proc_dointvec(struct ctl_table *table, int write,
2030 void __user *buffer, size_t *lenp, loff_t *ppos,
2031 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2032 int write, void *data),
2033 void *data)
2034 {
2035 return __do_proc_dointvec(table->data, table, write,
2036 buffer, lenp, ppos, conv, data);
2037 }
2038
2039 /**
2040 * proc_dointvec - read a vector of integers
2041 * @table: the sysctl table
2042 * @write: %TRUE if this is a write to the sysctl file
2043 * @buffer: the user buffer
2044 * @lenp: the size of the user buffer
2045 * @ppos: file position
2046 *
2047 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2048 * values from/to the user buffer, treated as an ASCII string.
2049 *
2050 * Returns 0 on success.
2051 */
2052 int proc_dointvec(struct ctl_table *table, int write,
2053 void __user *buffer, size_t *lenp, loff_t *ppos)
2054 {
2055 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2056 NULL,NULL);
2057 }
2058
2059 /*
2060 * Taint values can only be increased
2061 * This means we can safely use a temporary.
2062 */
2063 static int proc_taint(struct ctl_table *table, int write,
2064 void __user *buffer, size_t *lenp, loff_t *ppos)
2065 {
2066 struct ctl_table t;
2067 unsigned long tmptaint = get_taint();
2068 int err;
2069
2070 if (write && !capable(CAP_SYS_ADMIN))
2071 return -EPERM;
2072
2073 t = *table;
2074 t.data = &tmptaint;
2075 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
2076 if (err < 0)
2077 return err;
2078
2079 if (write) {
2080 /*
2081 * Poor man's atomic or. Not worth adding a primitive
2082 * to everyone's atomic.h for this
2083 */
2084 int i;
2085 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2086 if ((tmptaint >> i) & 1)
2087 add_taint(i, LOCKDEP_STILL_OK);
2088 }
2089 }
2090
2091 return err;
2092 }
2093
2094 #ifdef CONFIG_PRINTK
2095 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
2096 void __user *buffer, size_t *lenp, loff_t *ppos)
2097 {
2098 if (write && !capable(CAP_SYS_ADMIN))
2099 return -EPERM;
2100
2101 return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2102 }
2103 #endif
2104
2105 struct do_proc_dointvec_minmax_conv_param {
2106 int *min;
2107 int *max;
2108 };
2109
2110 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
2111 int *valp,
2112 int write, void *data)
2113 {
2114 struct do_proc_dointvec_minmax_conv_param *param = data;
2115 if (write) {
2116 int val = *negp ? -*lvalp : *lvalp;
2117 if ((param->min && *param->min > val) ||
2118 (param->max && *param->max < val))
2119 return -EINVAL;
2120 *valp = val;
2121 } else {
2122 int val = *valp;
2123 if (val < 0) {
2124 *negp = true;
2125 *lvalp = (unsigned long)-val;
2126 } else {
2127 *negp = false;
2128 *lvalp = (unsigned long)val;
2129 }
2130 }
2131 return 0;
2132 }
2133
2134 /**
2135 * proc_dointvec_minmax - read a vector of integers with min/max values
2136 * @table: the sysctl table
2137 * @write: %TRUE if this is a write to the sysctl file
2138 * @buffer: the user buffer
2139 * @lenp: the size of the user buffer
2140 * @ppos: file position
2141 *
2142 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2143 * values from/to the user buffer, treated as an ASCII string.
2144 *
2145 * This routine will ensure the values are within the range specified by
2146 * table->extra1 (min) and table->extra2 (max).
2147 *
2148 * Returns 0 on success.
2149 */
2150 int proc_dointvec_minmax(struct ctl_table *table, int write,
2151 void __user *buffer, size_t *lenp, loff_t *ppos)
2152 {
2153 struct do_proc_dointvec_minmax_conv_param param = {
2154 .min = (int *) table->extra1,
2155 .max = (int *) table->extra2,
2156 };
2157 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2158 do_proc_dointvec_minmax_conv, &param);
2159 }
2160
2161 static void validate_coredump_safety(void)
2162 {
2163 #ifdef CONFIG_COREDUMP
2164 if (suid_dumpable == SUID_DUMP_ROOT &&
2165 core_pattern[0] != '/' && core_pattern[0] != '|') {
2166 printk(KERN_WARNING "Unsafe core_pattern used with "\
2167 "suid_dumpable=2. Pipe handler or fully qualified "\
2168 "core dump path required.\n");
2169 }
2170 #endif
2171 }
2172
2173 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
2174 void __user *buffer, size_t *lenp, loff_t *ppos)
2175 {
2176 int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2177 if (!error)
2178 validate_coredump_safety();
2179 return error;
2180 }
2181
2182 #ifdef CONFIG_COREDUMP
2183 static int proc_dostring_coredump(struct ctl_table *table, int write,
2184 void __user *buffer, size_t *lenp, loff_t *ppos)
2185 {
2186 int error = proc_dostring(table, write, buffer, lenp, ppos);
2187 if (!error)
2188 validate_coredump_safety();
2189 return error;
2190 }
2191 #endif
2192
2193 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2194 void __user *buffer,
2195 size_t *lenp, loff_t *ppos,
2196 unsigned long convmul,
2197 unsigned long convdiv)
2198 {
2199 unsigned long *i, *min, *max;
2200 int vleft, first = 1, err = 0;
2201 unsigned long page = 0;
2202 size_t left;
2203 char *kbuf;
2204
2205 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
2206 *lenp = 0;
2207 return 0;
2208 }
2209
2210 i = (unsigned long *) data;
2211 min = (unsigned long *) table->extra1;
2212 max = (unsigned long *) table->extra2;
2213 vleft = table->maxlen / sizeof(unsigned long);
2214 left = *lenp;
2215
2216 if (write) {
2217 if (left > PAGE_SIZE - 1)
2218 left = PAGE_SIZE - 1;
2219 page = __get_free_page(GFP_TEMPORARY);
2220 kbuf = (char *) page;
2221 if (!kbuf)
2222 return -ENOMEM;
2223 if (copy_from_user(kbuf, buffer, left)) {
2224 err = -EFAULT;
2225 goto free;
2226 }
2227 kbuf[left] = 0;
2228 }
2229
2230 for (; left && vleft--; i++, first = 0) {
2231 unsigned long val;
2232
2233 if (write) {
2234 bool neg;
2235
2236 left -= proc_skip_spaces(&kbuf);
2237
2238 err = proc_get_long(&kbuf, &left, &val, &neg,
2239 proc_wspace_sep,
2240 sizeof(proc_wspace_sep), NULL);
2241 if (err)
2242 break;
2243 if (neg)
2244 continue;
2245 if ((min && val < *min) || (max && val > *max))
2246 continue;
2247 *i = val;
2248 } else {
2249 val = convdiv * (*i) / convmul;
2250 if (!first)
2251 err = proc_put_char(&buffer, &left, '\t');
2252 err = proc_put_long(&buffer, &left, val, false);
2253 if (err)
2254 break;
2255 }
2256 }
2257
2258 if (!write && !first && left && !err)
2259 err = proc_put_char(&buffer, &left, '\n');
2260 if (write && !err)
2261 left -= proc_skip_spaces(&kbuf);
2262 free:
2263 if (write) {
2264 free_page(page);
2265 if (first)
2266 return err ? : -EINVAL;
2267 }
2268 *lenp -= left;
2269 *ppos += *lenp;
2270 return err;
2271 }
2272
2273 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2274 void __user *buffer,
2275 size_t *lenp, loff_t *ppos,
2276 unsigned long convmul,
2277 unsigned long convdiv)
2278 {
2279 return __do_proc_doulongvec_minmax(table->data, table, write,
2280 buffer, lenp, ppos, convmul, convdiv);
2281 }
2282
2283 /**
2284 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2285 * @table: the sysctl table
2286 * @write: %TRUE if this is a write to the sysctl file
2287 * @buffer: the user buffer
2288 * @lenp: the size of the user buffer
2289 * @ppos: file position
2290 *
2291 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2292 * values from/to the user buffer, treated as an ASCII string.
2293 *
2294 * This routine will ensure the values are within the range specified by
2295 * table->extra1 (min) and table->extra2 (max).
2296 *
2297 * Returns 0 on success.
2298 */
2299 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2300 void __user *buffer, size_t *lenp, loff_t *ppos)
2301 {
2302 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
2303 }
2304
2305 /**
2306 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2307 * @table: the sysctl table
2308 * @write: %TRUE if this is a write to the sysctl file
2309 * @buffer: the user buffer
2310 * @lenp: the size of the user buffer
2311 * @ppos: file position
2312 *
2313 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2314 * values from/to the user buffer, treated as an ASCII string. The values
2315 * are treated as milliseconds, and converted to jiffies when they are stored.
2316 *
2317 * This routine will ensure the values are within the range specified by
2318 * table->extra1 (min) and table->extra2 (max).
2319 *
2320 * Returns 0 on success.
2321 */
2322 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2323 void __user *buffer,
2324 size_t *lenp, loff_t *ppos)
2325 {
2326 return do_proc_doulongvec_minmax(table, write, buffer,
2327 lenp, ppos, HZ, 1000l);
2328 }
2329
2330
2331 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
2332 int *valp,
2333 int write, void *data)
2334 {
2335 if (write) {
2336 if (*lvalp > LONG_MAX / HZ)
2337 return 1;
2338 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2339 } else {
2340 int val = *valp;
2341 unsigned long lval;
2342 if (val < 0) {
2343 *negp = true;
2344 lval = (unsigned long)-val;
2345 } else {
2346 *negp = false;
2347 lval = (unsigned long)val;
2348 }
2349 *lvalp = lval / HZ;
2350 }
2351 return 0;
2352 }
2353
2354 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
2355 int *valp,
2356 int write, void *data)
2357 {
2358 if (write) {
2359 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2360 return 1;
2361 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2362 } else {
2363 int val = *valp;
2364 unsigned long lval;
2365 if (val < 0) {
2366 *negp = true;
2367 lval = (unsigned long)-val;
2368 } else {
2369 *negp = false;
2370 lval = (unsigned long)val;
2371 }
2372 *lvalp = jiffies_to_clock_t(lval);
2373 }
2374 return 0;
2375 }
2376
2377 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
2378 int *valp,
2379 int write, void *data)
2380 {
2381 if (write) {
2382 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2383 } else {
2384 int val = *valp;
2385 unsigned long lval;
2386 if (val < 0) {
2387 *negp = true;
2388 lval = (unsigned long)-val;
2389 } else {
2390 *negp = false;
2391 lval = (unsigned long)val;
2392 }
2393 *lvalp = jiffies_to_msecs(lval);
2394 }
2395 return 0;
2396 }
2397
2398 /**
2399 * proc_dointvec_jiffies - read a vector of integers as seconds
2400 * @table: the sysctl table
2401 * @write: %TRUE if this is a write to the sysctl file
2402 * @buffer: the user buffer
2403 * @lenp: the size of the user buffer
2404 * @ppos: file position
2405 *
2406 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2407 * values from/to the user buffer, treated as an ASCII string.
2408 * The values read are assumed to be in seconds, and are converted into
2409 * jiffies.
2410 *
2411 * Returns 0 on success.
2412 */
2413 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2414 void __user *buffer, size_t *lenp, loff_t *ppos)
2415 {
2416 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2417 do_proc_dointvec_jiffies_conv,NULL);
2418 }
2419
2420 /**
2421 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2422 * @table: the sysctl table
2423 * @write: %TRUE if this is a write to the sysctl file
2424 * @buffer: the user buffer
2425 * @lenp: the size of the user buffer
2426 * @ppos: pointer to the file position
2427 *
2428 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2429 * values from/to the user buffer, treated as an ASCII string.
2430 * The values read are assumed to be in 1/USER_HZ seconds, and
2431 * are converted into jiffies.
2432 *
2433 * Returns 0 on success.
2434 */
2435 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2436 void __user *buffer, size_t *lenp, loff_t *ppos)
2437 {
2438 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2439 do_proc_dointvec_userhz_jiffies_conv,NULL);
2440 }
2441
2442 /**
2443 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2444 * @table: the sysctl table
2445 * @write: %TRUE if this is a write to the sysctl file
2446 * @buffer: the user buffer
2447 * @lenp: the size of the user buffer
2448 * @ppos: file position
2449 * @ppos: the current position in the file
2450 *
2451 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2452 * values from/to the user buffer, treated as an ASCII string.
2453 * The values read are assumed to be in 1/1000 seconds, and
2454 * are converted into jiffies.
2455 *
2456 * Returns 0 on success.
2457 */
2458 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2459 void __user *buffer, size_t *lenp, loff_t *ppos)
2460 {
2461 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2462 do_proc_dointvec_ms_jiffies_conv, NULL);
2463 }
2464
2465 static int proc_do_cad_pid(struct ctl_table *table, int write,
2466 void __user *buffer, size_t *lenp, loff_t *ppos)
2467 {
2468 struct pid *new_pid;
2469 pid_t tmp;
2470 int r;
2471
2472 tmp = pid_vnr(cad_pid);
2473
2474 r = __do_proc_dointvec(&tmp, table, write, buffer,
2475 lenp, ppos, NULL, NULL);
2476 if (r || !write)
2477 return r;
2478
2479 new_pid = find_get_pid(tmp);
2480 if (!new_pid)
2481 return -ESRCH;
2482
2483 put_pid(xchg(&cad_pid, new_pid));
2484 return 0;
2485 }
2486
2487 /**
2488 * proc_do_large_bitmap - read/write from/to a large bitmap
2489 * @table: the sysctl table
2490 * @write: %TRUE if this is a write to the sysctl file
2491 * @buffer: the user buffer
2492 * @lenp: the size of the user buffer
2493 * @ppos: file position
2494 *
2495 * The bitmap is stored at table->data and the bitmap length (in bits)
2496 * in table->maxlen.
2497 *
2498 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2499 * large bitmaps may be represented in a compact manner. Writing into
2500 * the file will clear the bitmap then update it with the given input.
2501 *
2502 * Returns 0 on success.
2503 */
2504 int proc_do_large_bitmap(struct ctl_table *table, int write,
2505 void __user *buffer, size_t *lenp, loff_t *ppos)
2506 {
2507 int err = 0;
2508 bool first = 1;
2509 size_t left = *lenp;
2510 unsigned long bitmap_len = table->maxlen;
2511 unsigned long *bitmap = (unsigned long *) table->data;
2512 unsigned long *tmp_bitmap = NULL;
2513 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
2514
2515 if (!bitmap_len || !left || (*ppos && !write)) {
2516 *lenp = 0;
2517 return 0;
2518 }
2519
2520 if (write) {
2521 unsigned long page = 0;
2522 char *kbuf;
2523
2524 if (left > PAGE_SIZE - 1)
2525 left = PAGE_SIZE - 1;
2526
2527 page = __get_free_page(GFP_TEMPORARY);
2528 kbuf = (char *) page;
2529 if (!kbuf)
2530 return -ENOMEM;
2531 if (copy_from_user(kbuf, buffer, left)) {
2532 free_page(page);
2533 return -EFAULT;
2534 }
2535 kbuf[left] = 0;
2536
2537 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long),
2538 GFP_KERNEL);
2539 if (!tmp_bitmap) {
2540 free_page(page);
2541 return -ENOMEM;
2542 }
2543 proc_skip_char(&kbuf, &left, '\n');
2544 while (!err && left) {
2545 unsigned long val_a, val_b;
2546 bool neg;
2547
2548 err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a,
2549 sizeof(tr_a), &c);
2550 if (err)
2551 break;
2552 if (val_a >= bitmap_len || neg) {
2553 err = -EINVAL;
2554 break;
2555 }
2556
2557 val_b = val_a;
2558 if (left) {
2559 kbuf++;
2560 left--;
2561 }
2562
2563 if (c == '-') {
2564 err = proc_get_long(&kbuf, &left, &val_b,
2565 &neg, tr_b, sizeof(tr_b),
2566 &c);
2567 if (err)
2568 break;
2569 if (val_b >= bitmap_len || neg ||
2570 val_a > val_b) {
2571 err = -EINVAL;
2572 break;
2573 }
2574 if (left) {
2575 kbuf++;
2576 left--;
2577 }
2578 }
2579
2580 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
2581 first = 0;
2582 proc_skip_char(&kbuf, &left, '\n');
2583 }
2584 free_page(page);
2585 } else {
2586 unsigned long bit_a, bit_b = 0;
2587
2588 while (left) {
2589 bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
2590 if (bit_a >= bitmap_len)
2591 break;
2592 bit_b = find_next_zero_bit(bitmap, bitmap_len,
2593 bit_a + 1) - 1;
2594
2595 if (!first) {
2596 err = proc_put_char(&buffer, &left, ',');
2597 if (err)
2598 break;
2599 }
2600 err = proc_put_long(&buffer, &left, bit_a, false);
2601 if (err)
2602 break;
2603 if (bit_a != bit_b) {
2604 err = proc_put_char(&buffer, &left, '-');
2605 if (err)
2606 break;
2607 err = proc_put_long(&buffer, &left, bit_b, false);
2608 if (err)
2609 break;
2610 }
2611
2612 first = 0; bit_b++;
2613 }
2614 if (!err)
2615 err = proc_put_char(&buffer, &left, '\n');
2616 }
2617
2618 if (!err) {
2619 if (write) {
2620 if (*ppos)
2621 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
2622 else
2623 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
2624 }
2625 kfree(tmp_bitmap);
2626 *lenp -= left;
2627 *ppos += *lenp;
2628 return 0;
2629 } else {
2630 kfree(tmp_bitmap);
2631 return err;
2632 }
2633 }
2634
2635 #else /* CONFIG_PROC_SYSCTL */
2636
2637 int proc_dostring(struct ctl_table *table, int write,
2638 void __user *buffer, size_t *lenp, loff_t *ppos)
2639 {
2640 return -ENOSYS;
2641 }
2642
2643 int proc_dointvec(struct ctl_table *table, int write,
2644 void __user *buffer, size_t *lenp, loff_t *ppos)
2645 {
2646 return -ENOSYS;
2647 }
2648
2649 int proc_dointvec_minmax(struct ctl_table *table, int write,
2650 void __user *buffer, size_t *lenp, loff_t *ppos)
2651 {
2652 return -ENOSYS;
2653 }
2654
2655 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2656 void __user *buffer, size_t *lenp, loff_t *ppos)
2657 {
2658 return -ENOSYS;
2659 }
2660
2661 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2662 void __user *buffer, size_t *lenp, loff_t *ppos)
2663 {
2664 return -ENOSYS;
2665 }
2666
2667 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2668 void __user *buffer, size_t *lenp, loff_t *ppos)
2669 {
2670 return -ENOSYS;
2671 }
2672
2673 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2674 void __user *buffer, size_t *lenp, loff_t *ppos)
2675 {
2676 return -ENOSYS;
2677 }
2678
2679 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2680 void __user *buffer,
2681 size_t *lenp, loff_t *ppos)
2682 {
2683 return -ENOSYS;
2684 }
2685
2686
2687 #endif /* CONFIG_PROC_SYSCTL */
2688
2689 /*
2690 * No sense putting this after each symbol definition, twice,
2691 * exception granted :-)
2692 */
2693 EXPORT_SYMBOL(proc_dointvec);
2694 EXPORT_SYMBOL(proc_dointvec_jiffies);
2695 EXPORT_SYMBOL(proc_dointvec_minmax);
2696 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2697 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2698 EXPORT_SYMBOL(proc_dostring);
2699 EXPORT_SYMBOL(proc_doulongvec_minmax);
2700 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
kernel source for telekom puls (alcatel/mediatek)