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Merge branch 'for-4.13-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj...
[mirror_ubuntu-artful-kernel.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/aio.h>
23 #include <linux/mm.h>
24 #include <linux/swap.h>
25 #include <linux/slab.h>
26 #include <linux/sysctl.h>
27 #include <linux/bitmap.h>
28 #include <linux/signal.h>
29 #include <linux/printk.h>
30 #include <linux/proc_fs.h>
31 #include <linux/security.h>
32 #include <linux/ctype.h>
33 #include <linux/kmemcheck.h>
34 #include <linux/kmemleak.h>
35 #include <linux/fs.h>
36 #include <linux/init.h>
37 #include <linux/kernel.h>
38 #include <linux/kobject.h>
39 #include <linux/net.h>
40 #include <linux/sysrq.h>
41 #include <linux/highuid.h>
42 #include <linux/writeback.h>
43 #include <linux/ratelimit.h>
44 #include <linux/compaction.h>
45 #include <linux/hugetlb.h>
46 #include <linux/initrd.h>
47 #include <linux/key.h>
48 #include <linux/times.h>
49 #include <linux/limits.h>
50 #include <linux/dcache.h>
51 #include <linux/dnotify.h>
52 #include <linux/syscalls.h>
53 #include <linux/vmstat.h>
54 #include <linux/nfs_fs.h>
55 #include <linux/acpi.h>
56 #include <linux/reboot.h>
57 #include <linux/ftrace.h>
58 #include <linux/perf_event.h>
59 #include <linux/kprobes.h>
60 #include <linux/pipe_fs_i.h>
61 #include <linux/oom.h>
62 #include <linux/kmod.h>
63 #include <linux/capability.h>
64 #include <linux/binfmts.h>
65 #include <linux/sched/sysctl.h>
66 #include <linux/sched/coredump.h>
67 #include <linux/kexec.h>
68 #include <linux/bpf.h>
69 #include <linux/mount.h>
70
71 #include <linux/uaccess.h>
72 #include <asm/processor.h>
73
74 #ifdef CONFIG_X86
75 #include <asm/nmi.h>
76 #include <asm/stacktrace.h>
77 #include <asm/io.h>
78 #endif
79 #ifdef CONFIG_SPARC
80 #include <asm/setup.h>
81 #endif
82 #ifdef CONFIG_BSD_PROCESS_ACCT
83 #include <linux/acct.h>
84 #endif
85 #ifdef CONFIG_RT_MUTEXES
86 #include <linux/rtmutex.h>
87 #endif
88 #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
89 #include <linux/lockdep.h>
90 #endif
91 #ifdef CONFIG_CHR_DEV_SG
92 #include <scsi/sg.h>
93 #endif
94
95 #ifdef CONFIG_LOCKUP_DETECTOR
96 #include <linux/nmi.h>
97 #endif
98
99 #if defined(CONFIG_SYSCTL)
100
101 /* External variables not in a header file. */
102 extern int suid_dumpable;
103 #ifdef CONFIG_COREDUMP
104 extern int core_uses_pid;
105 extern char core_pattern[];
106 extern unsigned int core_pipe_limit;
107 #endif
108 extern int pid_max;
109 extern int pid_max_min, pid_max_max;
110 extern int percpu_pagelist_fraction;
111 extern int latencytop_enabled;
112 extern unsigned int sysctl_nr_open_min, sysctl_nr_open_max;
113 #ifndef CONFIG_MMU
114 extern int sysctl_nr_trim_pages;
115 #endif
116
117 /* Constants used for minimum and maximum */
118 #ifdef CONFIG_LOCKUP_DETECTOR
119 static int sixty = 60;
120 #endif
121
122 static int __maybe_unused neg_one = -1;
123
124 static int zero;
125 static int __maybe_unused one = 1;
126 static int __maybe_unused two = 2;
127 static int __maybe_unused four = 4;
128 static unsigned long one_ul = 1;
129 static int one_hundred = 100;
130 static int one_thousand = 1000;
131 #ifdef CONFIG_PRINTK
132 static int ten_thousand = 10000;
133 #endif
134 #ifdef CONFIG_PERF_EVENTS
135 static int six_hundred_forty_kb = 640 * 1024;
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
145 static int ngroups_max = NGROUPS_MAX;
146 static const int cap_last_cap = CAP_LAST_CAP;
147
148 /*this is needed for proc_doulongvec_minmax of sysctl_hung_task_timeout_secs */
149 #ifdef CONFIG_DETECT_HUNG_TASK
150 static unsigned long hung_task_timeout_max = (LONG_MAX/HZ);
151 #endif
152
153 #ifdef CONFIG_INOTIFY_USER
154 #include <linux/inotify.h>
155 #endif
156 #ifdef CONFIG_SPARC
157 #endif
158
159 #ifdef __hppa__
160 extern int pwrsw_enabled;
161 #endif
162
163 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
164 extern int unaligned_enabled;
165 #endif
166
167 #ifdef CONFIG_IA64
168 extern int unaligned_dump_stack;
169 #endif
170
171 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
172 extern int no_unaligned_warning;
173 #endif
174
175 #ifdef CONFIG_PROC_SYSCTL
176
177 /**
178 * enum sysctl_writes_mode - supported sysctl write modes
179 *
180 * @SYSCTL_WRITES_LEGACY: each write syscall must fully contain the sysctl value
181 * to be written, and multiple writes on the same sysctl file descriptor
182 * will rewrite the sysctl value, regardless of file position. No warning
183 * is issued when the initial position is not 0.
184 * @SYSCTL_WRITES_WARN: same as above but warn when the initial file position is
185 * not 0.
186 * @SYSCTL_WRITES_STRICT: writes to numeric sysctl entries must always be at
187 * file position 0 and the value must be fully contained in the buffer
188 * sent to the write syscall. If dealing with strings respect the file
189 * position, but restrict this to the max length of the buffer, anything
190 * passed the max lenght will be ignored. Multiple writes will append
191 * to the buffer.
192 *
193 * These write modes control how current file position affects the behavior of
194 * updating sysctl values through the proc interface on each write.
195 */
196 enum sysctl_writes_mode {
197 SYSCTL_WRITES_LEGACY = -1,
198 SYSCTL_WRITES_WARN = 0,
199 SYSCTL_WRITES_STRICT = 1,
200 };
201
202 static enum sysctl_writes_mode sysctl_writes_strict = SYSCTL_WRITES_STRICT;
203
204 static int proc_do_cad_pid(struct ctl_table *table, int write,
205 void __user *buffer, size_t *lenp, loff_t *ppos);
206 static int proc_taint(struct ctl_table *table, int write,
207 void __user *buffer, size_t *lenp, loff_t *ppos);
208 #endif
209
210 #ifdef CONFIG_PRINTK
211 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
212 void __user *buffer, size_t *lenp, loff_t *ppos);
213 #endif
214
215 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
216 void __user *buffer, size_t *lenp, loff_t *ppos);
217 #ifdef CONFIG_COREDUMP
218 static int proc_dostring_coredump(struct ctl_table *table, int write,
219 void __user *buffer, size_t *lenp, loff_t *ppos);
220 #endif
221
222 #ifdef CONFIG_MAGIC_SYSRQ
223 /* Note: sysrq code uses it's own private copy */
224 static int __sysrq_enabled = CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE;
225
226 static int sysrq_sysctl_handler(struct ctl_table *table, int write,
227 void __user *buffer, size_t *lenp,
228 loff_t *ppos)
229 {
230 int error;
231
232 error = proc_dointvec(table, write, buffer, lenp, ppos);
233 if (error)
234 return error;
235
236 if (write)
237 sysrq_toggle_support(__sysrq_enabled);
238
239 return 0;
240 }
241
242 #endif
243
244 static struct ctl_table kern_table[];
245 static struct ctl_table vm_table[];
246 static struct ctl_table fs_table[];
247 static struct ctl_table debug_table[];
248 static struct ctl_table dev_table[];
249 extern struct ctl_table random_table[];
250 #ifdef CONFIG_EPOLL
251 extern struct ctl_table epoll_table[];
252 #endif
253
254 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
255 int sysctl_legacy_va_layout;
256 #endif
257
258 /* The default sysctl tables: */
259
260 static struct ctl_table sysctl_base_table[] = {
261 {
262 .procname = "kernel",
263 .mode = 0555,
264 .child = kern_table,
265 },
266 {
267 .procname = "vm",
268 .mode = 0555,
269 .child = vm_table,
270 },
271 {
272 .procname = "fs",
273 .mode = 0555,
274 .child = fs_table,
275 },
276 {
277 .procname = "debug",
278 .mode = 0555,
279 .child = debug_table,
280 },
281 {
282 .procname = "dev",
283 .mode = 0555,
284 .child = dev_table,
285 },
286 { }
287 };
288
289 #ifdef CONFIG_SCHED_DEBUG
290 static int min_sched_granularity_ns = 100000; /* 100 usecs */
291 static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */
292 static int min_wakeup_granularity_ns; /* 0 usecs */
293 static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */
294 #ifdef CONFIG_SMP
295 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
296 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
297 #endif /* CONFIG_SMP */
298 #endif /* CONFIG_SCHED_DEBUG */
299
300 #ifdef CONFIG_COMPACTION
301 static int min_extfrag_threshold;
302 static int max_extfrag_threshold = 1000;
303 #endif
304
305 static struct ctl_table kern_table[] = {
306 {
307 .procname = "sched_child_runs_first",
308 .data = &sysctl_sched_child_runs_first,
309 .maxlen = sizeof(unsigned int),
310 .mode = 0644,
311 .proc_handler = proc_dointvec,
312 },
313 #ifdef CONFIG_SCHED_DEBUG
314 {
315 .procname = "sched_min_granularity_ns",
316 .data = &sysctl_sched_min_granularity,
317 .maxlen = sizeof(unsigned int),
318 .mode = 0644,
319 .proc_handler = sched_proc_update_handler,
320 .extra1 = &min_sched_granularity_ns,
321 .extra2 = &max_sched_granularity_ns,
322 },
323 {
324 .procname = "sched_latency_ns",
325 .data = &sysctl_sched_latency,
326 .maxlen = sizeof(unsigned int),
327 .mode = 0644,
328 .proc_handler = sched_proc_update_handler,
329 .extra1 = &min_sched_granularity_ns,
330 .extra2 = &max_sched_granularity_ns,
331 },
332 {
333 .procname = "sched_wakeup_granularity_ns",
334 .data = &sysctl_sched_wakeup_granularity,
335 .maxlen = sizeof(unsigned int),
336 .mode = 0644,
337 .proc_handler = sched_proc_update_handler,
338 .extra1 = &min_wakeup_granularity_ns,
339 .extra2 = &max_wakeup_granularity_ns,
340 },
341 #ifdef CONFIG_SMP
342 {
343 .procname = "sched_tunable_scaling",
344 .data = &sysctl_sched_tunable_scaling,
345 .maxlen = sizeof(enum sched_tunable_scaling),
346 .mode = 0644,
347 .proc_handler = sched_proc_update_handler,
348 .extra1 = &min_sched_tunable_scaling,
349 .extra2 = &max_sched_tunable_scaling,
350 },
351 {
352 .procname = "sched_migration_cost_ns",
353 .data = &sysctl_sched_migration_cost,
354 .maxlen = sizeof(unsigned int),
355 .mode = 0644,
356 .proc_handler = proc_dointvec,
357 },
358 {
359 .procname = "sched_nr_migrate",
360 .data = &sysctl_sched_nr_migrate,
361 .maxlen = sizeof(unsigned int),
362 .mode = 0644,
363 .proc_handler = proc_dointvec,
364 },
365 {
366 .procname = "sched_time_avg_ms",
367 .data = &sysctl_sched_time_avg,
368 .maxlen = sizeof(unsigned int),
369 .mode = 0644,
370 .proc_handler = proc_dointvec,
371 },
372 #ifdef CONFIG_SCHEDSTATS
373 {
374 .procname = "sched_schedstats",
375 .data = NULL,
376 .maxlen = sizeof(unsigned int),
377 .mode = 0644,
378 .proc_handler = sysctl_schedstats,
379 .extra1 = &zero,
380 .extra2 = &one,
381 },
382 #endif /* CONFIG_SCHEDSTATS */
383 #endif /* CONFIG_SMP */
384 #ifdef CONFIG_NUMA_BALANCING
385 {
386 .procname = "numa_balancing_scan_delay_ms",
387 .data = &sysctl_numa_balancing_scan_delay,
388 .maxlen = sizeof(unsigned int),
389 .mode = 0644,
390 .proc_handler = proc_dointvec,
391 },
392 {
393 .procname = "numa_balancing_scan_period_min_ms",
394 .data = &sysctl_numa_balancing_scan_period_min,
395 .maxlen = sizeof(unsigned int),
396 .mode = 0644,
397 .proc_handler = proc_dointvec,
398 },
399 {
400 .procname = "numa_balancing_scan_period_max_ms",
401 .data = &sysctl_numa_balancing_scan_period_max,
402 .maxlen = sizeof(unsigned int),
403 .mode = 0644,
404 .proc_handler = proc_dointvec,
405 },
406 {
407 .procname = "numa_balancing_scan_size_mb",
408 .data = &sysctl_numa_balancing_scan_size,
409 .maxlen = sizeof(unsigned int),
410 .mode = 0644,
411 .proc_handler = proc_dointvec_minmax,
412 .extra1 = &one,
413 },
414 {
415 .procname = "numa_balancing",
416 .data = NULL, /* filled in by handler */
417 .maxlen = sizeof(unsigned int),
418 .mode = 0644,
419 .proc_handler = sysctl_numa_balancing,
420 .extra1 = &zero,
421 .extra2 = &one,
422 },
423 #endif /* CONFIG_NUMA_BALANCING */
424 #endif /* CONFIG_SCHED_DEBUG */
425 {
426 .procname = "sched_rt_period_us",
427 .data = &sysctl_sched_rt_period,
428 .maxlen = sizeof(unsigned int),
429 .mode = 0644,
430 .proc_handler = sched_rt_handler,
431 },
432 {
433 .procname = "sched_rt_runtime_us",
434 .data = &sysctl_sched_rt_runtime,
435 .maxlen = sizeof(int),
436 .mode = 0644,
437 .proc_handler = sched_rt_handler,
438 },
439 {
440 .procname = "sched_rr_timeslice_ms",
441 .data = &sysctl_sched_rr_timeslice,
442 .maxlen = sizeof(int),
443 .mode = 0644,
444 .proc_handler = sched_rr_handler,
445 },
446 #ifdef CONFIG_SCHED_AUTOGROUP
447 {
448 .procname = "sched_autogroup_enabled",
449 .data = &sysctl_sched_autogroup_enabled,
450 .maxlen = sizeof(unsigned int),
451 .mode = 0644,
452 .proc_handler = proc_dointvec_minmax,
453 .extra1 = &zero,
454 .extra2 = &one,
455 },
456 #endif
457 #ifdef CONFIG_CFS_BANDWIDTH
458 {
459 .procname = "sched_cfs_bandwidth_slice_us",
460 .data = &sysctl_sched_cfs_bandwidth_slice,
461 .maxlen = sizeof(unsigned int),
462 .mode = 0644,
463 .proc_handler = proc_dointvec_minmax,
464 .extra1 = &one,
465 },
466 #endif
467 #ifdef CONFIG_PROVE_LOCKING
468 {
469 .procname = "prove_locking",
470 .data = &prove_locking,
471 .maxlen = sizeof(int),
472 .mode = 0644,
473 .proc_handler = proc_dointvec,
474 },
475 #endif
476 #ifdef CONFIG_LOCK_STAT
477 {
478 .procname = "lock_stat",
479 .data = &lock_stat,
480 .maxlen = sizeof(int),
481 .mode = 0644,
482 .proc_handler = proc_dointvec,
483 },
484 #endif
485 {
486 .procname = "panic",
487 .data = &panic_timeout,
488 .maxlen = sizeof(int),
489 .mode = 0644,
490 .proc_handler = proc_dointvec,
491 },
492 #ifdef CONFIG_COREDUMP
493 {
494 .procname = "core_uses_pid",
495 .data = &core_uses_pid,
496 .maxlen = sizeof(int),
497 .mode = 0644,
498 .proc_handler = proc_dointvec,
499 },
500 {
501 .procname = "core_pattern",
502 .data = core_pattern,
503 .maxlen = CORENAME_MAX_SIZE,
504 .mode = 0644,
505 .proc_handler = proc_dostring_coredump,
506 },
507 {
508 .procname = "core_pipe_limit",
509 .data = &core_pipe_limit,
510 .maxlen = sizeof(unsigned int),
511 .mode = 0644,
512 .proc_handler = proc_dointvec,
513 },
514 #endif
515 #ifdef CONFIG_PROC_SYSCTL
516 {
517 .procname = "tainted",
518 .maxlen = sizeof(long),
519 .mode = 0644,
520 .proc_handler = proc_taint,
521 },
522 {
523 .procname = "sysctl_writes_strict",
524 .data = &sysctl_writes_strict,
525 .maxlen = sizeof(int),
526 .mode = 0644,
527 .proc_handler = proc_dointvec_minmax,
528 .extra1 = &neg_one,
529 .extra2 = &one,
530 },
531 #endif
532 #ifdef CONFIG_LATENCYTOP
533 {
534 .procname = "latencytop",
535 .data = &latencytop_enabled,
536 .maxlen = sizeof(int),
537 .mode = 0644,
538 .proc_handler = sysctl_latencytop,
539 },
540 #endif
541 #ifdef CONFIG_BLK_DEV_INITRD
542 {
543 .procname = "real-root-dev",
544 .data = &real_root_dev,
545 .maxlen = sizeof(int),
546 .mode = 0644,
547 .proc_handler = proc_dointvec,
548 },
549 #endif
550 {
551 .procname = "print-fatal-signals",
552 .data = &print_fatal_signals,
553 .maxlen = sizeof(int),
554 .mode = 0644,
555 .proc_handler = proc_dointvec,
556 },
557 #ifdef CONFIG_SPARC
558 {
559 .procname = "reboot-cmd",
560 .data = reboot_command,
561 .maxlen = 256,
562 .mode = 0644,
563 .proc_handler = proc_dostring,
564 },
565 {
566 .procname = "stop-a",
567 .data = &stop_a_enabled,
568 .maxlen = sizeof (int),
569 .mode = 0644,
570 .proc_handler = proc_dointvec,
571 },
572 {
573 .procname = "scons-poweroff",
574 .data = &scons_pwroff,
575 .maxlen = sizeof (int),
576 .mode = 0644,
577 .proc_handler = proc_dointvec,
578 },
579 #endif
580 #ifdef CONFIG_SPARC64
581 {
582 .procname = "tsb-ratio",
583 .data = &sysctl_tsb_ratio,
584 .maxlen = sizeof (int),
585 .mode = 0644,
586 .proc_handler = proc_dointvec,
587 },
588 #endif
589 #ifdef __hppa__
590 {
591 .procname = "soft-power",
592 .data = &pwrsw_enabled,
593 .maxlen = sizeof (int),
594 .mode = 0644,
595 .proc_handler = proc_dointvec,
596 },
597 #endif
598 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
599 {
600 .procname = "unaligned-trap",
601 .data = &unaligned_enabled,
602 .maxlen = sizeof (int),
603 .mode = 0644,
604 .proc_handler = proc_dointvec,
605 },
606 #endif
607 {
608 .procname = "ctrl-alt-del",
609 .data = &C_A_D,
610 .maxlen = sizeof(int),
611 .mode = 0644,
612 .proc_handler = proc_dointvec,
613 },
614 #ifdef CONFIG_FUNCTION_TRACER
615 {
616 .procname = "ftrace_enabled",
617 .data = &ftrace_enabled,
618 .maxlen = sizeof(int),
619 .mode = 0644,
620 .proc_handler = ftrace_enable_sysctl,
621 },
622 #endif
623 #ifdef CONFIG_STACK_TRACER
624 {
625 .procname = "stack_tracer_enabled",
626 .data = &stack_tracer_enabled,
627 .maxlen = sizeof(int),
628 .mode = 0644,
629 .proc_handler = stack_trace_sysctl,
630 },
631 #endif
632 #ifdef CONFIG_TRACING
633 {
634 .procname = "ftrace_dump_on_oops",
635 .data = &ftrace_dump_on_oops,
636 .maxlen = sizeof(int),
637 .mode = 0644,
638 .proc_handler = proc_dointvec,
639 },
640 {
641 .procname = "traceoff_on_warning",
642 .data = &__disable_trace_on_warning,
643 .maxlen = sizeof(__disable_trace_on_warning),
644 .mode = 0644,
645 .proc_handler = proc_dointvec,
646 },
647 {
648 .procname = "tracepoint_printk",
649 .data = &tracepoint_printk,
650 .maxlen = sizeof(tracepoint_printk),
651 .mode = 0644,
652 .proc_handler = tracepoint_printk_sysctl,
653 },
654 #endif
655 #ifdef CONFIG_KEXEC_CORE
656 {
657 .procname = "kexec_load_disabled",
658 .data = &kexec_load_disabled,
659 .maxlen = sizeof(int),
660 .mode = 0644,
661 /* only handle a transition from default "0" to "1" */
662 .proc_handler = proc_dointvec_minmax,
663 .extra1 = &one,
664 .extra2 = &one,
665 },
666 #endif
667 #ifdef CONFIG_MODULES
668 {
669 .procname = "modprobe",
670 .data = &modprobe_path,
671 .maxlen = KMOD_PATH_LEN,
672 .mode = 0644,
673 .proc_handler = proc_dostring,
674 },
675 {
676 .procname = "modules_disabled",
677 .data = &modules_disabled,
678 .maxlen = sizeof(int),
679 .mode = 0644,
680 /* only handle a transition from default "0" to "1" */
681 .proc_handler = proc_dointvec_minmax,
682 .extra1 = &one,
683 .extra2 = &one,
684 },
685 #endif
686 #ifdef CONFIG_UEVENT_HELPER
687 {
688 .procname = "hotplug",
689 .data = &uevent_helper,
690 .maxlen = UEVENT_HELPER_PATH_LEN,
691 .mode = 0644,
692 .proc_handler = proc_dostring,
693 },
694 #endif
695 #ifdef CONFIG_CHR_DEV_SG
696 {
697 .procname = "sg-big-buff",
698 .data = &sg_big_buff,
699 .maxlen = sizeof (int),
700 .mode = 0444,
701 .proc_handler = proc_dointvec,
702 },
703 #endif
704 #ifdef CONFIG_BSD_PROCESS_ACCT
705 {
706 .procname = "acct",
707 .data = &acct_parm,
708 .maxlen = 3*sizeof(int),
709 .mode = 0644,
710 .proc_handler = proc_dointvec,
711 },
712 #endif
713 #ifdef CONFIG_MAGIC_SYSRQ
714 {
715 .procname = "sysrq",
716 .data = &__sysrq_enabled,
717 .maxlen = sizeof (int),
718 .mode = 0644,
719 .proc_handler = sysrq_sysctl_handler,
720 },
721 #endif
722 #ifdef CONFIG_PROC_SYSCTL
723 {
724 .procname = "cad_pid",
725 .data = NULL,
726 .maxlen = sizeof (int),
727 .mode = 0600,
728 .proc_handler = proc_do_cad_pid,
729 },
730 #endif
731 {
732 .procname = "threads-max",
733 .data = NULL,
734 .maxlen = sizeof(int),
735 .mode = 0644,
736 .proc_handler = sysctl_max_threads,
737 },
738 {
739 .procname = "random",
740 .mode = 0555,
741 .child = random_table,
742 },
743 {
744 .procname = "usermodehelper",
745 .mode = 0555,
746 .child = usermodehelper_table,
747 },
748 {
749 .procname = "overflowuid",
750 .data = &overflowuid,
751 .maxlen = sizeof(int),
752 .mode = 0644,
753 .proc_handler = proc_dointvec_minmax,
754 .extra1 = &minolduid,
755 .extra2 = &maxolduid,
756 },
757 {
758 .procname = "overflowgid",
759 .data = &overflowgid,
760 .maxlen = sizeof(int),
761 .mode = 0644,
762 .proc_handler = proc_dointvec_minmax,
763 .extra1 = &minolduid,
764 .extra2 = &maxolduid,
765 },
766 #ifdef CONFIG_S390
767 #ifdef CONFIG_MATHEMU
768 {
769 .procname = "ieee_emulation_warnings",
770 .data = &sysctl_ieee_emulation_warnings,
771 .maxlen = sizeof(int),
772 .mode = 0644,
773 .proc_handler = proc_dointvec,
774 },
775 #endif
776 {
777 .procname = "userprocess_debug",
778 .data = &show_unhandled_signals,
779 .maxlen = sizeof(int),
780 .mode = 0644,
781 .proc_handler = proc_dointvec,
782 },
783 #endif
784 {
785 .procname = "pid_max",
786 .data = &pid_max,
787 .maxlen = sizeof (int),
788 .mode = 0644,
789 .proc_handler = proc_dointvec_minmax,
790 .extra1 = &pid_max_min,
791 .extra2 = &pid_max_max,
792 },
793 {
794 .procname = "panic_on_oops",
795 .data = &panic_on_oops,
796 .maxlen = sizeof(int),
797 .mode = 0644,
798 .proc_handler = proc_dointvec,
799 },
800 #if defined CONFIG_PRINTK
801 {
802 .procname = "printk",
803 .data = &console_loglevel,
804 .maxlen = 4*sizeof(int),
805 .mode = 0644,
806 .proc_handler = proc_dointvec,
807 },
808 {
809 .procname = "printk_ratelimit",
810 .data = &printk_ratelimit_state.interval,
811 .maxlen = sizeof(int),
812 .mode = 0644,
813 .proc_handler = proc_dointvec_jiffies,
814 },
815 {
816 .procname = "printk_ratelimit_burst",
817 .data = &printk_ratelimit_state.burst,
818 .maxlen = sizeof(int),
819 .mode = 0644,
820 .proc_handler = proc_dointvec,
821 },
822 {
823 .procname = "printk_delay",
824 .data = &printk_delay_msec,
825 .maxlen = sizeof(int),
826 .mode = 0644,
827 .proc_handler = proc_dointvec_minmax,
828 .extra1 = &zero,
829 .extra2 = &ten_thousand,
830 },
831 {
832 .procname = "printk_devkmsg",
833 .data = devkmsg_log_str,
834 .maxlen = DEVKMSG_STR_MAX_SIZE,
835 .mode = 0644,
836 .proc_handler = devkmsg_sysctl_set_loglvl,
837 },
838 {
839 .procname = "dmesg_restrict",
840 .data = &dmesg_restrict,
841 .maxlen = sizeof(int),
842 .mode = 0644,
843 .proc_handler = proc_dointvec_minmax_sysadmin,
844 .extra1 = &zero,
845 .extra2 = &one,
846 },
847 {
848 .procname = "kptr_restrict",
849 .data = &kptr_restrict,
850 .maxlen = sizeof(int),
851 .mode = 0644,
852 .proc_handler = proc_dointvec_minmax_sysadmin,
853 .extra1 = &zero,
854 .extra2 = &two,
855 },
856 #endif
857 {
858 .procname = "ngroups_max",
859 .data = &ngroups_max,
860 .maxlen = sizeof (int),
861 .mode = 0444,
862 .proc_handler = proc_dointvec,
863 },
864 {
865 .procname = "cap_last_cap",
866 .data = (void *)&cap_last_cap,
867 .maxlen = sizeof(int),
868 .mode = 0444,
869 .proc_handler = proc_dointvec,
870 },
871 #if defined(CONFIG_LOCKUP_DETECTOR)
872 {
873 .procname = "watchdog",
874 .data = &watchdog_user_enabled,
875 .maxlen = sizeof (int),
876 .mode = 0644,
877 .proc_handler = proc_watchdog,
878 .extra1 = &zero,
879 .extra2 = &one,
880 },
881 {
882 .procname = "watchdog_thresh",
883 .data = &watchdog_thresh,
884 .maxlen = sizeof(int),
885 .mode = 0644,
886 .proc_handler = proc_watchdog_thresh,
887 .extra1 = &zero,
888 .extra2 = &sixty,
889 },
890 {
891 .procname = "nmi_watchdog",
892 .data = &nmi_watchdog_enabled,
893 .maxlen = sizeof (int),
894 .mode = 0644,
895 .proc_handler = proc_nmi_watchdog,
896 .extra1 = &zero,
897 #if defined(CONFIG_HAVE_NMI_WATCHDOG) || defined(CONFIG_HARDLOCKUP_DETECTOR)
898 .extra2 = &one,
899 #else
900 .extra2 = &zero,
901 #endif
902 },
903 {
904 .procname = "watchdog_cpumask",
905 .data = &watchdog_cpumask_bits,
906 .maxlen = NR_CPUS,
907 .mode = 0644,
908 .proc_handler = proc_watchdog_cpumask,
909 },
910 #ifdef CONFIG_SOFTLOCKUP_DETECTOR
911 {
912 .procname = "soft_watchdog",
913 .data = &soft_watchdog_enabled,
914 .maxlen = sizeof (int),
915 .mode = 0644,
916 .proc_handler = proc_soft_watchdog,
917 .extra1 = &zero,
918 .extra2 = &one,
919 },
920 {
921 .procname = "softlockup_panic",
922 .data = &softlockup_panic,
923 .maxlen = sizeof(int),
924 .mode = 0644,
925 .proc_handler = proc_dointvec_minmax,
926 .extra1 = &zero,
927 .extra2 = &one,
928 },
929 #ifdef CONFIG_SMP
930 {
931 .procname = "softlockup_all_cpu_backtrace",
932 .data = &sysctl_softlockup_all_cpu_backtrace,
933 .maxlen = sizeof(int),
934 .mode = 0644,
935 .proc_handler = proc_dointvec_minmax,
936 .extra1 = &zero,
937 .extra2 = &one,
938 },
939 #endif /* CONFIG_SMP */
940 #endif
941 #ifdef CONFIG_HARDLOCKUP_DETECTOR
942 {
943 .procname = "hardlockup_panic",
944 .data = &hardlockup_panic,
945 .maxlen = sizeof(int),
946 .mode = 0644,
947 .proc_handler = proc_dointvec_minmax,
948 .extra1 = &zero,
949 .extra2 = &one,
950 },
951 #ifdef CONFIG_SMP
952 {
953 .procname = "hardlockup_all_cpu_backtrace",
954 .data = &sysctl_hardlockup_all_cpu_backtrace,
955 .maxlen = sizeof(int),
956 .mode = 0644,
957 .proc_handler = proc_dointvec_minmax,
958 .extra1 = &zero,
959 .extra2 = &one,
960 },
961 #endif /* CONFIG_SMP */
962 #endif
963 #endif
964
965 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
966 {
967 .procname = "unknown_nmi_panic",
968 .data = &unknown_nmi_panic,
969 .maxlen = sizeof (int),
970 .mode = 0644,
971 .proc_handler = proc_dointvec,
972 },
973 #endif
974 #if defined(CONFIG_X86)
975 {
976 .procname = "panic_on_unrecovered_nmi",
977 .data = &panic_on_unrecovered_nmi,
978 .maxlen = sizeof(int),
979 .mode = 0644,
980 .proc_handler = proc_dointvec,
981 },
982 {
983 .procname = "panic_on_io_nmi",
984 .data = &panic_on_io_nmi,
985 .maxlen = sizeof(int),
986 .mode = 0644,
987 .proc_handler = proc_dointvec,
988 },
989 #ifdef CONFIG_DEBUG_STACKOVERFLOW
990 {
991 .procname = "panic_on_stackoverflow",
992 .data = &sysctl_panic_on_stackoverflow,
993 .maxlen = sizeof(int),
994 .mode = 0644,
995 .proc_handler = proc_dointvec,
996 },
997 #endif
998 {
999 .procname = "bootloader_type",
1000 .data = &bootloader_type,
1001 .maxlen = sizeof (int),
1002 .mode = 0444,
1003 .proc_handler = proc_dointvec,
1004 },
1005 {
1006 .procname = "bootloader_version",
1007 .data = &bootloader_version,
1008 .maxlen = sizeof (int),
1009 .mode = 0444,
1010 .proc_handler = proc_dointvec,
1011 },
1012 {
1013 .procname = "io_delay_type",
1014 .data = &io_delay_type,
1015 .maxlen = sizeof(int),
1016 .mode = 0644,
1017 .proc_handler = proc_dointvec,
1018 },
1019 #endif
1020 #if defined(CONFIG_MMU)
1021 {
1022 .procname = "randomize_va_space",
1023 .data = &randomize_va_space,
1024 .maxlen = sizeof(int),
1025 .mode = 0644,
1026 .proc_handler = proc_dointvec,
1027 },
1028 #endif
1029 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
1030 {
1031 .procname = "spin_retry",
1032 .data = &spin_retry,
1033 .maxlen = sizeof (int),
1034 .mode = 0644,
1035 .proc_handler = proc_dointvec,
1036 },
1037 #endif
1038 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
1039 {
1040 .procname = "acpi_video_flags",
1041 .data = &acpi_realmode_flags,
1042 .maxlen = sizeof (unsigned long),
1043 .mode = 0644,
1044 .proc_handler = proc_doulongvec_minmax,
1045 },
1046 #endif
1047 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
1048 {
1049 .procname = "ignore-unaligned-usertrap",
1050 .data = &no_unaligned_warning,
1051 .maxlen = sizeof (int),
1052 .mode = 0644,
1053 .proc_handler = proc_dointvec,
1054 },
1055 #endif
1056 #ifdef CONFIG_IA64
1057 {
1058 .procname = "unaligned-dump-stack",
1059 .data = &unaligned_dump_stack,
1060 .maxlen = sizeof (int),
1061 .mode = 0644,
1062 .proc_handler = proc_dointvec,
1063 },
1064 #endif
1065 #ifdef CONFIG_DETECT_HUNG_TASK
1066 {
1067 .procname = "hung_task_panic",
1068 .data = &sysctl_hung_task_panic,
1069 .maxlen = sizeof(int),
1070 .mode = 0644,
1071 .proc_handler = proc_dointvec_minmax,
1072 .extra1 = &zero,
1073 .extra2 = &one,
1074 },
1075 {
1076 .procname = "hung_task_check_count",
1077 .data = &sysctl_hung_task_check_count,
1078 .maxlen = sizeof(int),
1079 .mode = 0644,
1080 .proc_handler = proc_dointvec_minmax,
1081 .extra1 = &zero,
1082 },
1083 {
1084 .procname = "hung_task_timeout_secs",
1085 .data = &sysctl_hung_task_timeout_secs,
1086 .maxlen = sizeof(unsigned long),
1087 .mode = 0644,
1088 .proc_handler = proc_dohung_task_timeout_secs,
1089 .extra2 = &hung_task_timeout_max,
1090 },
1091 {
1092 .procname = "hung_task_warnings",
1093 .data = &sysctl_hung_task_warnings,
1094 .maxlen = sizeof(int),
1095 .mode = 0644,
1096 .proc_handler = proc_dointvec_minmax,
1097 .extra1 = &neg_one,
1098 },
1099 #endif
1100 #ifdef CONFIG_RT_MUTEXES
1101 {
1102 .procname = "max_lock_depth",
1103 .data = &max_lock_depth,
1104 .maxlen = sizeof(int),
1105 .mode = 0644,
1106 .proc_handler = proc_dointvec,
1107 },
1108 #endif
1109 {
1110 .procname = "poweroff_cmd",
1111 .data = &poweroff_cmd,
1112 .maxlen = POWEROFF_CMD_PATH_LEN,
1113 .mode = 0644,
1114 .proc_handler = proc_dostring,
1115 },
1116 #ifdef CONFIG_KEYS
1117 {
1118 .procname = "keys",
1119 .mode = 0555,
1120 .child = key_sysctls,
1121 },
1122 #endif
1123 #ifdef CONFIG_PERF_EVENTS
1124 /*
1125 * User-space scripts rely on the existence of this file
1126 * as a feature check for perf_events being enabled.
1127 *
1128 * So it's an ABI, do not remove!
1129 */
1130 {
1131 .procname = "perf_event_paranoid",
1132 .data = &sysctl_perf_event_paranoid,
1133 .maxlen = sizeof(sysctl_perf_event_paranoid),
1134 .mode = 0644,
1135 .proc_handler = proc_dointvec,
1136 },
1137 {
1138 .procname = "perf_event_mlock_kb",
1139 .data = &sysctl_perf_event_mlock,
1140 .maxlen = sizeof(sysctl_perf_event_mlock),
1141 .mode = 0644,
1142 .proc_handler = proc_dointvec,
1143 },
1144 {
1145 .procname = "perf_event_max_sample_rate",
1146 .data = &sysctl_perf_event_sample_rate,
1147 .maxlen = sizeof(sysctl_perf_event_sample_rate),
1148 .mode = 0644,
1149 .proc_handler = perf_proc_update_handler,
1150 .extra1 = &one,
1151 },
1152 {
1153 .procname = "perf_cpu_time_max_percent",
1154 .data = &sysctl_perf_cpu_time_max_percent,
1155 .maxlen = sizeof(sysctl_perf_cpu_time_max_percent),
1156 .mode = 0644,
1157 .proc_handler = perf_cpu_time_max_percent_handler,
1158 .extra1 = &zero,
1159 .extra2 = &one_hundred,
1160 },
1161 {
1162 .procname = "perf_event_max_stack",
1163 .data = &sysctl_perf_event_max_stack,
1164 .maxlen = sizeof(sysctl_perf_event_max_stack),
1165 .mode = 0644,
1166 .proc_handler = perf_event_max_stack_handler,
1167 .extra1 = &zero,
1168 .extra2 = &six_hundred_forty_kb,
1169 },
1170 {
1171 .procname = "perf_event_max_contexts_per_stack",
1172 .data = &sysctl_perf_event_max_contexts_per_stack,
1173 .maxlen = sizeof(sysctl_perf_event_max_contexts_per_stack),
1174 .mode = 0644,
1175 .proc_handler = perf_event_max_stack_handler,
1176 .extra1 = &zero,
1177 .extra2 = &one_thousand,
1178 },
1179 #endif
1180 #ifdef CONFIG_KMEMCHECK
1181 {
1182 .procname = "kmemcheck",
1183 .data = &kmemcheck_enabled,
1184 .maxlen = sizeof(int),
1185 .mode = 0644,
1186 .proc_handler = proc_dointvec,
1187 },
1188 #endif
1189 {
1190 .procname = "panic_on_warn",
1191 .data = &panic_on_warn,
1192 .maxlen = sizeof(int),
1193 .mode = 0644,
1194 .proc_handler = proc_dointvec_minmax,
1195 .extra1 = &zero,
1196 .extra2 = &one,
1197 },
1198 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON)
1199 {
1200 .procname = "timer_migration",
1201 .data = &sysctl_timer_migration,
1202 .maxlen = sizeof(unsigned int),
1203 .mode = 0644,
1204 .proc_handler = timer_migration_handler,
1205 .extra1 = &zero,
1206 .extra2 = &one,
1207 },
1208 #endif
1209 #ifdef CONFIG_BPF_SYSCALL
1210 {
1211 .procname = "unprivileged_bpf_disabled",
1212 .data = &sysctl_unprivileged_bpf_disabled,
1213 .maxlen = sizeof(sysctl_unprivileged_bpf_disabled),
1214 .mode = 0644,
1215 /* only handle a transition from default "0" to "1" */
1216 .proc_handler = proc_dointvec_minmax,
1217 .extra1 = &one,
1218 .extra2 = &one,
1219 },
1220 #endif
1221 #if defined(CONFIG_TREE_RCU) || defined(CONFIG_PREEMPT_RCU)
1222 {
1223 .procname = "panic_on_rcu_stall",
1224 .data = &sysctl_panic_on_rcu_stall,
1225 .maxlen = sizeof(sysctl_panic_on_rcu_stall),
1226 .mode = 0644,
1227 .proc_handler = proc_dointvec_minmax,
1228 .extra1 = &zero,
1229 .extra2 = &one,
1230 },
1231 #endif
1232 { }
1233 };
1234
1235 static struct ctl_table vm_table[] = {
1236 {
1237 .procname = "overcommit_memory",
1238 .data = &sysctl_overcommit_memory,
1239 .maxlen = sizeof(sysctl_overcommit_memory),
1240 .mode = 0644,
1241 .proc_handler = proc_dointvec_minmax,
1242 .extra1 = &zero,
1243 .extra2 = &two,
1244 },
1245 {
1246 .procname = "panic_on_oom",
1247 .data = &sysctl_panic_on_oom,
1248 .maxlen = sizeof(sysctl_panic_on_oom),
1249 .mode = 0644,
1250 .proc_handler = proc_dointvec_minmax,
1251 .extra1 = &zero,
1252 .extra2 = &two,
1253 },
1254 {
1255 .procname = "oom_kill_allocating_task",
1256 .data = &sysctl_oom_kill_allocating_task,
1257 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
1258 .mode = 0644,
1259 .proc_handler = proc_dointvec,
1260 },
1261 {
1262 .procname = "oom_dump_tasks",
1263 .data = &sysctl_oom_dump_tasks,
1264 .maxlen = sizeof(sysctl_oom_dump_tasks),
1265 .mode = 0644,
1266 .proc_handler = proc_dointvec,
1267 },
1268 {
1269 .procname = "overcommit_ratio",
1270 .data = &sysctl_overcommit_ratio,
1271 .maxlen = sizeof(sysctl_overcommit_ratio),
1272 .mode = 0644,
1273 .proc_handler = overcommit_ratio_handler,
1274 },
1275 {
1276 .procname = "overcommit_kbytes",
1277 .data = &sysctl_overcommit_kbytes,
1278 .maxlen = sizeof(sysctl_overcommit_kbytes),
1279 .mode = 0644,
1280 .proc_handler = overcommit_kbytes_handler,
1281 },
1282 {
1283 .procname = "page-cluster",
1284 .data = &page_cluster,
1285 .maxlen = sizeof(int),
1286 .mode = 0644,
1287 .proc_handler = proc_dointvec_minmax,
1288 .extra1 = &zero,
1289 },
1290 {
1291 .procname = "dirty_background_ratio",
1292 .data = &dirty_background_ratio,
1293 .maxlen = sizeof(dirty_background_ratio),
1294 .mode = 0644,
1295 .proc_handler = dirty_background_ratio_handler,
1296 .extra1 = &zero,
1297 .extra2 = &one_hundred,
1298 },
1299 {
1300 .procname = "dirty_background_bytes",
1301 .data = &dirty_background_bytes,
1302 .maxlen = sizeof(dirty_background_bytes),
1303 .mode = 0644,
1304 .proc_handler = dirty_background_bytes_handler,
1305 .extra1 = &one_ul,
1306 },
1307 {
1308 .procname = "dirty_ratio",
1309 .data = &vm_dirty_ratio,
1310 .maxlen = sizeof(vm_dirty_ratio),
1311 .mode = 0644,
1312 .proc_handler = dirty_ratio_handler,
1313 .extra1 = &zero,
1314 .extra2 = &one_hundred,
1315 },
1316 {
1317 .procname = "dirty_bytes",
1318 .data = &vm_dirty_bytes,
1319 .maxlen = sizeof(vm_dirty_bytes),
1320 .mode = 0644,
1321 .proc_handler = dirty_bytes_handler,
1322 .extra1 = &dirty_bytes_min,
1323 },
1324 {
1325 .procname = "dirty_writeback_centisecs",
1326 .data = &dirty_writeback_interval,
1327 .maxlen = sizeof(dirty_writeback_interval),
1328 .mode = 0644,
1329 .proc_handler = dirty_writeback_centisecs_handler,
1330 },
1331 {
1332 .procname = "dirty_expire_centisecs",
1333 .data = &dirty_expire_interval,
1334 .maxlen = sizeof(dirty_expire_interval),
1335 .mode = 0644,
1336 .proc_handler = proc_dointvec_minmax,
1337 .extra1 = &zero,
1338 },
1339 {
1340 .procname = "dirtytime_expire_seconds",
1341 .data = &dirtytime_expire_interval,
1342 .maxlen = sizeof(dirty_expire_interval),
1343 .mode = 0644,
1344 .proc_handler = dirtytime_interval_handler,
1345 .extra1 = &zero,
1346 },
1347 {
1348 .procname = "nr_pdflush_threads",
1349 .mode = 0444 /* read-only */,
1350 .proc_handler = pdflush_proc_obsolete,
1351 },
1352 {
1353 .procname = "swappiness",
1354 .data = &vm_swappiness,
1355 .maxlen = sizeof(vm_swappiness),
1356 .mode = 0644,
1357 .proc_handler = proc_dointvec_minmax,
1358 .extra1 = &zero,
1359 .extra2 = &one_hundred,
1360 },
1361 #ifdef CONFIG_HUGETLB_PAGE
1362 {
1363 .procname = "nr_hugepages",
1364 .data = NULL,
1365 .maxlen = sizeof(unsigned long),
1366 .mode = 0644,
1367 .proc_handler = hugetlb_sysctl_handler,
1368 },
1369 #ifdef CONFIG_NUMA
1370 {
1371 .procname = "nr_hugepages_mempolicy",
1372 .data = NULL,
1373 .maxlen = sizeof(unsigned long),
1374 .mode = 0644,
1375 .proc_handler = &hugetlb_mempolicy_sysctl_handler,
1376 },
1377 #endif
1378 {
1379 .procname = "hugetlb_shm_group",
1380 .data = &sysctl_hugetlb_shm_group,
1381 .maxlen = sizeof(gid_t),
1382 .mode = 0644,
1383 .proc_handler = proc_dointvec,
1384 },
1385 {
1386 .procname = "hugepages_treat_as_movable",
1387 .data = &hugepages_treat_as_movable,
1388 .maxlen = sizeof(int),
1389 .mode = 0644,
1390 .proc_handler = proc_dointvec,
1391 },
1392 {
1393 .procname = "nr_overcommit_hugepages",
1394 .data = NULL,
1395 .maxlen = sizeof(unsigned long),
1396 .mode = 0644,
1397 .proc_handler = hugetlb_overcommit_handler,
1398 },
1399 #endif
1400 {
1401 .procname = "lowmem_reserve_ratio",
1402 .data = &sysctl_lowmem_reserve_ratio,
1403 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1404 .mode = 0644,
1405 .proc_handler = lowmem_reserve_ratio_sysctl_handler,
1406 },
1407 {
1408 .procname = "drop_caches",
1409 .data = &sysctl_drop_caches,
1410 .maxlen = sizeof(int),
1411 .mode = 0644,
1412 .proc_handler = drop_caches_sysctl_handler,
1413 .extra1 = &one,
1414 .extra2 = &four,
1415 },
1416 #ifdef CONFIG_COMPACTION
1417 {
1418 .procname = "compact_memory",
1419 .data = &sysctl_compact_memory,
1420 .maxlen = sizeof(int),
1421 .mode = 0200,
1422 .proc_handler = sysctl_compaction_handler,
1423 },
1424 {
1425 .procname = "extfrag_threshold",
1426 .data = &sysctl_extfrag_threshold,
1427 .maxlen = sizeof(int),
1428 .mode = 0644,
1429 .proc_handler = sysctl_extfrag_handler,
1430 .extra1 = &min_extfrag_threshold,
1431 .extra2 = &max_extfrag_threshold,
1432 },
1433 {
1434 .procname = "compact_unevictable_allowed",
1435 .data = &sysctl_compact_unevictable_allowed,
1436 .maxlen = sizeof(int),
1437 .mode = 0644,
1438 .proc_handler = proc_dointvec,
1439 .extra1 = &zero,
1440 .extra2 = &one,
1441 },
1442
1443 #endif /* CONFIG_COMPACTION */
1444 {
1445 .procname = "min_free_kbytes",
1446 .data = &min_free_kbytes,
1447 .maxlen = sizeof(min_free_kbytes),
1448 .mode = 0644,
1449 .proc_handler = min_free_kbytes_sysctl_handler,
1450 .extra1 = &zero,
1451 },
1452 {
1453 .procname = "watermark_scale_factor",
1454 .data = &watermark_scale_factor,
1455 .maxlen = sizeof(watermark_scale_factor),
1456 .mode = 0644,
1457 .proc_handler = watermark_scale_factor_sysctl_handler,
1458 .extra1 = &one,
1459 .extra2 = &one_thousand,
1460 },
1461 {
1462 .procname = "percpu_pagelist_fraction",
1463 .data = &percpu_pagelist_fraction,
1464 .maxlen = sizeof(percpu_pagelist_fraction),
1465 .mode = 0644,
1466 .proc_handler = percpu_pagelist_fraction_sysctl_handler,
1467 .extra1 = &zero,
1468 },
1469 #ifdef CONFIG_MMU
1470 {
1471 .procname = "max_map_count",
1472 .data = &sysctl_max_map_count,
1473 .maxlen = sizeof(sysctl_max_map_count),
1474 .mode = 0644,
1475 .proc_handler = proc_dointvec_minmax,
1476 .extra1 = &zero,
1477 },
1478 #else
1479 {
1480 .procname = "nr_trim_pages",
1481 .data = &sysctl_nr_trim_pages,
1482 .maxlen = sizeof(sysctl_nr_trim_pages),
1483 .mode = 0644,
1484 .proc_handler = proc_dointvec_minmax,
1485 .extra1 = &zero,
1486 },
1487 #endif
1488 {
1489 .procname = "laptop_mode",
1490 .data = &laptop_mode,
1491 .maxlen = sizeof(laptop_mode),
1492 .mode = 0644,
1493 .proc_handler = proc_dointvec_jiffies,
1494 },
1495 {
1496 .procname = "block_dump",
1497 .data = &block_dump,
1498 .maxlen = sizeof(block_dump),
1499 .mode = 0644,
1500 .proc_handler = proc_dointvec,
1501 .extra1 = &zero,
1502 },
1503 {
1504 .procname = "vfs_cache_pressure",
1505 .data = &sysctl_vfs_cache_pressure,
1506 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1507 .mode = 0644,
1508 .proc_handler = proc_dointvec,
1509 .extra1 = &zero,
1510 },
1511 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1512 {
1513 .procname = "legacy_va_layout",
1514 .data = &sysctl_legacy_va_layout,
1515 .maxlen = sizeof(sysctl_legacy_va_layout),
1516 .mode = 0644,
1517 .proc_handler = proc_dointvec,
1518 .extra1 = &zero,
1519 },
1520 #endif
1521 #ifdef CONFIG_NUMA
1522 {
1523 .procname = "zone_reclaim_mode",
1524 .data = &node_reclaim_mode,
1525 .maxlen = sizeof(node_reclaim_mode),
1526 .mode = 0644,
1527 .proc_handler = proc_dointvec,
1528 .extra1 = &zero,
1529 },
1530 {
1531 .procname = "min_unmapped_ratio",
1532 .data = &sysctl_min_unmapped_ratio,
1533 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1534 .mode = 0644,
1535 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler,
1536 .extra1 = &zero,
1537 .extra2 = &one_hundred,
1538 },
1539 {
1540 .procname = "min_slab_ratio",
1541 .data = &sysctl_min_slab_ratio,
1542 .maxlen = sizeof(sysctl_min_slab_ratio),
1543 .mode = 0644,
1544 .proc_handler = sysctl_min_slab_ratio_sysctl_handler,
1545 .extra1 = &zero,
1546 .extra2 = &one_hundred,
1547 },
1548 #endif
1549 #ifdef CONFIG_SMP
1550 {
1551 .procname = "stat_interval",
1552 .data = &sysctl_stat_interval,
1553 .maxlen = sizeof(sysctl_stat_interval),
1554 .mode = 0644,
1555 .proc_handler = proc_dointvec_jiffies,
1556 },
1557 {
1558 .procname = "stat_refresh",
1559 .data = NULL,
1560 .maxlen = 0,
1561 .mode = 0600,
1562 .proc_handler = vmstat_refresh,
1563 },
1564 #endif
1565 #ifdef CONFIG_MMU
1566 {
1567 .procname = "mmap_min_addr",
1568 .data = &dac_mmap_min_addr,
1569 .maxlen = sizeof(unsigned long),
1570 .mode = 0644,
1571 .proc_handler = mmap_min_addr_handler,
1572 },
1573 #endif
1574 #ifdef CONFIG_NUMA
1575 {
1576 .procname = "numa_zonelist_order",
1577 .data = &numa_zonelist_order,
1578 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1579 .mode = 0644,
1580 .proc_handler = numa_zonelist_order_handler,
1581 },
1582 #endif
1583 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1584 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1585 {
1586 .procname = "vdso_enabled",
1587 #ifdef CONFIG_X86_32
1588 .data = &vdso32_enabled,
1589 .maxlen = sizeof(vdso32_enabled),
1590 #else
1591 .data = &vdso_enabled,
1592 .maxlen = sizeof(vdso_enabled),
1593 #endif
1594 .mode = 0644,
1595 .proc_handler = proc_dointvec,
1596 .extra1 = &zero,
1597 },
1598 #endif
1599 #ifdef CONFIG_HIGHMEM
1600 {
1601 .procname = "highmem_is_dirtyable",
1602 .data = &vm_highmem_is_dirtyable,
1603 .maxlen = sizeof(vm_highmem_is_dirtyable),
1604 .mode = 0644,
1605 .proc_handler = proc_dointvec_minmax,
1606 .extra1 = &zero,
1607 .extra2 = &one,
1608 },
1609 #endif
1610 #ifdef CONFIG_MEMORY_FAILURE
1611 {
1612 .procname = "memory_failure_early_kill",
1613 .data = &sysctl_memory_failure_early_kill,
1614 .maxlen = sizeof(sysctl_memory_failure_early_kill),
1615 .mode = 0644,
1616 .proc_handler = proc_dointvec_minmax,
1617 .extra1 = &zero,
1618 .extra2 = &one,
1619 },
1620 {
1621 .procname = "memory_failure_recovery",
1622 .data = &sysctl_memory_failure_recovery,
1623 .maxlen = sizeof(sysctl_memory_failure_recovery),
1624 .mode = 0644,
1625 .proc_handler = proc_dointvec_minmax,
1626 .extra1 = &zero,
1627 .extra2 = &one,
1628 },
1629 #endif
1630 {
1631 .procname = "user_reserve_kbytes",
1632 .data = &sysctl_user_reserve_kbytes,
1633 .maxlen = sizeof(sysctl_user_reserve_kbytes),
1634 .mode = 0644,
1635 .proc_handler = proc_doulongvec_minmax,
1636 },
1637 {
1638 .procname = "admin_reserve_kbytes",
1639 .data = &sysctl_admin_reserve_kbytes,
1640 .maxlen = sizeof(sysctl_admin_reserve_kbytes),
1641 .mode = 0644,
1642 .proc_handler = proc_doulongvec_minmax,
1643 },
1644 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS
1645 {
1646 .procname = "mmap_rnd_bits",
1647 .data = &mmap_rnd_bits,
1648 .maxlen = sizeof(mmap_rnd_bits),
1649 .mode = 0600,
1650 .proc_handler = proc_dointvec_minmax,
1651 .extra1 = (void *)&mmap_rnd_bits_min,
1652 .extra2 = (void *)&mmap_rnd_bits_max,
1653 },
1654 #endif
1655 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS
1656 {
1657 .procname = "mmap_rnd_compat_bits",
1658 .data = &mmap_rnd_compat_bits,
1659 .maxlen = sizeof(mmap_rnd_compat_bits),
1660 .mode = 0600,
1661 .proc_handler = proc_dointvec_minmax,
1662 .extra1 = (void *)&mmap_rnd_compat_bits_min,
1663 .extra2 = (void *)&mmap_rnd_compat_bits_max,
1664 },
1665 #endif
1666 { }
1667 };
1668
1669 static struct ctl_table fs_table[] = {
1670 {
1671 .procname = "inode-nr",
1672 .data = &inodes_stat,
1673 .maxlen = 2*sizeof(long),
1674 .mode = 0444,
1675 .proc_handler = proc_nr_inodes,
1676 },
1677 {
1678 .procname = "inode-state",
1679 .data = &inodes_stat,
1680 .maxlen = 7*sizeof(long),
1681 .mode = 0444,
1682 .proc_handler = proc_nr_inodes,
1683 },
1684 {
1685 .procname = "file-nr",
1686 .data = &files_stat,
1687 .maxlen = sizeof(files_stat),
1688 .mode = 0444,
1689 .proc_handler = proc_nr_files,
1690 },
1691 {
1692 .procname = "file-max",
1693 .data = &files_stat.max_files,
1694 .maxlen = sizeof(files_stat.max_files),
1695 .mode = 0644,
1696 .proc_handler = proc_doulongvec_minmax,
1697 },
1698 {
1699 .procname = "nr_open",
1700 .data = &sysctl_nr_open,
1701 .maxlen = sizeof(unsigned int),
1702 .mode = 0644,
1703 .proc_handler = proc_dointvec_minmax,
1704 .extra1 = &sysctl_nr_open_min,
1705 .extra2 = &sysctl_nr_open_max,
1706 },
1707 {
1708 .procname = "dentry-state",
1709 .data = &dentry_stat,
1710 .maxlen = 6*sizeof(long),
1711 .mode = 0444,
1712 .proc_handler = proc_nr_dentry,
1713 },
1714 {
1715 .procname = "overflowuid",
1716 .data = &fs_overflowuid,
1717 .maxlen = sizeof(int),
1718 .mode = 0644,
1719 .proc_handler = proc_dointvec_minmax,
1720 .extra1 = &minolduid,
1721 .extra2 = &maxolduid,
1722 },
1723 {
1724 .procname = "overflowgid",
1725 .data = &fs_overflowgid,
1726 .maxlen = sizeof(int),
1727 .mode = 0644,
1728 .proc_handler = proc_dointvec_minmax,
1729 .extra1 = &minolduid,
1730 .extra2 = &maxolduid,
1731 },
1732 #ifdef CONFIG_FILE_LOCKING
1733 {
1734 .procname = "leases-enable",
1735 .data = &leases_enable,
1736 .maxlen = sizeof(int),
1737 .mode = 0644,
1738 .proc_handler = proc_dointvec,
1739 },
1740 #endif
1741 #ifdef CONFIG_DNOTIFY
1742 {
1743 .procname = "dir-notify-enable",
1744 .data = &dir_notify_enable,
1745 .maxlen = sizeof(int),
1746 .mode = 0644,
1747 .proc_handler = proc_dointvec,
1748 },
1749 #endif
1750 #ifdef CONFIG_MMU
1751 #ifdef CONFIG_FILE_LOCKING
1752 {
1753 .procname = "lease-break-time",
1754 .data = &lease_break_time,
1755 .maxlen = sizeof(int),
1756 .mode = 0644,
1757 .proc_handler = proc_dointvec,
1758 },
1759 #endif
1760 #ifdef CONFIG_AIO
1761 {
1762 .procname = "aio-nr",
1763 .data = &aio_nr,
1764 .maxlen = sizeof(aio_nr),
1765 .mode = 0444,
1766 .proc_handler = proc_doulongvec_minmax,
1767 },
1768 {
1769 .procname = "aio-max-nr",
1770 .data = &aio_max_nr,
1771 .maxlen = sizeof(aio_max_nr),
1772 .mode = 0644,
1773 .proc_handler = proc_doulongvec_minmax,
1774 },
1775 #endif /* CONFIG_AIO */
1776 #ifdef CONFIG_INOTIFY_USER
1777 {
1778 .procname = "inotify",
1779 .mode = 0555,
1780 .child = inotify_table,
1781 },
1782 #endif
1783 #ifdef CONFIG_EPOLL
1784 {
1785 .procname = "epoll",
1786 .mode = 0555,
1787 .child = epoll_table,
1788 },
1789 #endif
1790 #endif
1791 {
1792 .procname = "protected_symlinks",
1793 .data = &sysctl_protected_symlinks,
1794 .maxlen = sizeof(int),
1795 .mode = 0600,
1796 .proc_handler = proc_dointvec_minmax,
1797 .extra1 = &zero,
1798 .extra2 = &one,
1799 },
1800 {
1801 .procname = "protected_hardlinks",
1802 .data = &sysctl_protected_hardlinks,
1803 .maxlen = sizeof(int),
1804 .mode = 0600,
1805 .proc_handler = proc_dointvec_minmax,
1806 .extra1 = &zero,
1807 .extra2 = &one,
1808 },
1809 {
1810 .procname = "suid_dumpable",
1811 .data = &suid_dumpable,
1812 .maxlen = sizeof(int),
1813 .mode = 0644,
1814 .proc_handler = proc_dointvec_minmax_coredump,
1815 .extra1 = &zero,
1816 .extra2 = &two,
1817 },
1818 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1819 {
1820 .procname = "binfmt_misc",
1821 .mode = 0555,
1822 .child = sysctl_mount_point,
1823 },
1824 #endif
1825 {
1826 .procname = "pipe-max-size",
1827 .data = &pipe_max_size,
1828 .maxlen = sizeof(int),
1829 .mode = 0644,
1830 .proc_handler = &pipe_proc_fn,
1831 .extra1 = &pipe_min_size,
1832 },
1833 {
1834 .procname = "pipe-user-pages-hard",
1835 .data = &pipe_user_pages_hard,
1836 .maxlen = sizeof(pipe_user_pages_hard),
1837 .mode = 0644,
1838 .proc_handler = proc_doulongvec_minmax,
1839 },
1840 {
1841 .procname = "pipe-user-pages-soft",
1842 .data = &pipe_user_pages_soft,
1843 .maxlen = sizeof(pipe_user_pages_soft),
1844 .mode = 0644,
1845 .proc_handler = proc_doulongvec_minmax,
1846 },
1847 {
1848 .procname = "mount-max",
1849 .data = &sysctl_mount_max,
1850 .maxlen = sizeof(unsigned int),
1851 .mode = 0644,
1852 .proc_handler = proc_dointvec_minmax,
1853 .extra1 = &one,
1854 },
1855 { }
1856 };
1857
1858 static struct ctl_table debug_table[] = {
1859 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
1860 {
1861 .procname = "exception-trace",
1862 .data = &show_unhandled_signals,
1863 .maxlen = sizeof(int),
1864 .mode = 0644,
1865 .proc_handler = proc_dointvec
1866 },
1867 #endif
1868 #if defined(CONFIG_OPTPROBES)
1869 {
1870 .procname = "kprobes-optimization",
1871 .data = &sysctl_kprobes_optimization,
1872 .maxlen = sizeof(int),
1873 .mode = 0644,
1874 .proc_handler = proc_kprobes_optimization_handler,
1875 .extra1 = &zero,
1876 .extra2 = &one,
1877 },
1878 #endif
1879 { }
1880 };
1881
1882 static struct ctl_table dev_table[] = {
1883 { }
1884 };
1885
1886 int __init sysctl_init(void)
1887 {
1888 struct ctl_table_header *hdr;
1889
1890 hdr = register_sysctl_table(sysctl_base_table);
1891 kmemleak_not_leak(hdr);
1892 return 0;
1893 }
1894
1895 #endif /* CONFIG_SYSCTL */
1896
1897 /*
1898 * /proc/sys support
1899 */
1900
1901 #ifdef CONFIG_PROC_SYSCTL
1902
1903 static int _proc_do_string(char *data, int maxlen, int write,
1904 char __user *buffer,
1905 size_t *lenp, loff_t *ppos)
1906 {
1907 size_t len;
1908 char __user *p;
1909 char c;
1910
1911 if (!data || !maxlen || !*lenp) {
1912 *lenp = 0;
1913 return 0;
1914 }
1915
1916 if (write) {
1917 if (sysctl_writes_strict == SYSCTL_WRITES_STRICT) {
1918 /* Only continue writes not past the end of buffer. */
1919 len = strlen(data);
1920 if (len > maxlen - 1)
1921 len = maxlen - 1;
1922
1923 if (*ppos > len)
1924 return 0;
1925 len = *ppos;
1926 } else {
1927 /* Start writing from beginning of buffer. */
1928 len = 0;
1929 }
1930
1931 *ppos += *lenp;
1932 p = buffer;
1933 while ((p - buffer) < *lenp && len < maxlen - 1) {
1934 if (get_user(c, p++))
1935 return -EFAULT;
1936 if (c == 0 || c == '\n')
1937 break;
1938 data[len++] = c;
1939 }
1940 data[len] = 0;
1941 } else {
1942 len = strlen(data);
1943 if (len > maxlen)
1944 len = maxlen;
1945
1946 if (*ppos > len) {
1947 *lenp = 0;
1948 return 0;
1949 }
1950
1951 data += *ppos;
1952 len -= *ppos;
1953
1954 if (len > *lenp)
1955 len = *lenp;
1956 if (len)
1957 if (copy_to_user(buffer, data, len))
1958 return -EFAULT;
1959 if (len < *lenp) {
1960 if (put_user('\n', buffer + len))
1961 return -EFAULT;
1962 len++;
1963 }
1964 *lenp = len;
1965 *ppos += len;
1966 }
1967 return 0;
1968 }
1969
1970 static void warn_sysctl_write(struct ctl_table *table)
1971 {
1972 pr_warn_once("%s wrote to %s when file position was not 0!\n"
1973 "This will not be supported in the future. To silence this\n"
1974 "warning, set kernel.sysctl_writes_strict = -1\n",
1975 current->comm, table->procname);
1976 }
1977
1978 /**
1979 * proc_first_pos_non_zero_ignore - check if firs position is allowed
1980 * @ppos: file position
1981 * @table: the sysctl table
1982 *
1983 * Returns true if the first position is non-zero and the sysctl_writes_strict
1984 * mode indicates this is not allowed for numeric input types. String proc
1985 * hadlers can ignore the return value.
1986 */
1987 static bool proc_first_pos_non_zero_ignore(loff_t *ppos,
1988 struct ctl_table *table)
1989 {
1990 if (!*ppos)
1991 return false;
1992
1993 switch (sysctl_writes_strict) {
1994 case SYSCTL_WRITES_STRICT:
1995 return true;
1996 case SYSCTL_WRITES_WARN:
1997 warn_sysctl_write(table);
1998 return false;
1999 default:
2000 return false;
2001 }
2002 }
2003
2004 /**
2005 * proc_dostring - read a string sysctl
2006 * @table: the sysctl table
2007 * @write: %TRUE if this is a write to the sysctl file
2008 * @buffer: the user buffer
2009 * @lenp: the size of the user buffer
2010 * @ppos: file position
2011 *
2012 * Reads/writes a string from/to the user buffer. If the kernel
2013 * buffer provided is not large enough to hold the string, the
2014 * string is truncated. The copied string is %NULL-terminated.
2015 * If the string is being read by the user process, it is copied
2016 * and a newline '\n' is added. It is truncated if the buffer is
2017 * not large enough.
2018 *
2019 * Returns 0 on success.
2020 */
2021 int proc_dostring(struct ctl_table *table, int write,
2022 void __user *buffer, size_t *lenp, loff_t *ppos)
2023 {
2024 if (write)
2025 proc_first_pos_non_zero_ignore(ppos, table);
2026
2027 return _proc_do_string((char *)(table->data), table->maxlen, write,
2028 (char __user *)buffer, lenp, ppos);
2029 }
2030
2031 static size_t proc_skip_spaces(char **buf)
2032 {
2033 size_t ret;
2034 char *tmp = skip_spaces(*buf);
2035 ret = tmp - *buf;
2036 *buf = tmp;
2037 return ret;
2038 }
2039
2040 static void proc_skip_char(char **buf, size_t *size, const char v)
2041 {
2042 while (*size) {
2043 if (**buf != v)
2044 break;
2045 (*size)--;
2046 (*buf)++;
2047 }
2048 }
2049
2050 #define TMPBUFLEN 22
2051 /**
2052 * proc_get_long - reads an ASCII formatted integer from a user buffer
2053 *
2054 * @buf: a kernel buffer
2055 * @size: size of the kernel buffer
2056 * @val: this is where the number will be stored
2057 * @neg: set to %TRUE if number is negative
2058 * @perm_tr: a vector which contains the allowed trailers
2059 * @perm_tr_len: size of the perm_tr vector
2060 * @tr: pointer to store the trailer character
2061 *
2062 * In case of success %0 is returned and @buf and @size are updated with
2063 * the amount of bytes read. If @tr is non-NULL and a trailing
2064 * character exists (size is non-zero after returning from this
2065 * function), @tr is updated with the trailing character.
2066 */
2067 static int proc_get_long(char **buf, size_t *size,
2068 unsigned long *val, bool *neg,
2069 const char *perm_tr, unsigned perm_tr_len, char *tr)
2070 {
2071 int len;
2072 char *p, tmp[TMPBUFLEN];
2073
2074 if (!*size)
2075 return -EINVAL;
2076
2077 len = *size;
2078 if (len > TMPBUFLEN - 1)
2079 len = TMPBUFLEN - 1;
2080
2081 memcpy(tmp, *buf, len);
2082
2083 tmp[len] = 0;
2084 p = tmp;
2085 if (*p == '-' && *size > 1) {
2086 *neg = true;
2087 p++;
2088 } else
2089 *neg = false;
2090 if (!isdigit(*p))
2091 return -EINVAL;
2092
2093 *val = simple_strtoul(p, &p, 0);
2094
2095 len = p - tmp;
2096
2097 /* We don't know if the next char is whitespace thus we may accept
2098 * invalid integers (e.g. 1234...a) or two integers instead of one
2099 * (e.g. 123...1). So lets not allow such large numbers. */
2100 if (len == TMPBUFLEN - 1)
2101 return -EINVAL;
2102
2103 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
2104 return -EINVAL;
2105
2106 if (tr && (len < *size))
2107 *tr = *p;
2108
2109 *buf += len;
2110 *size -= len;
2111
2112 return 0;
2113 }
2114
2115 /**
2116 * proc_put_long - converts an integer to a decimal ASCII formatted string
2117 *
2118 * @buf: the user buffer
2119 * @size: the size of the user buffer
2120 * @val: the integer to be converted
2121 * @neg: sign of the number, %TRUE for negative
2122 *
2123 * In case of success %0 is returned and @buf and @size are updated with
2124 * the amount of bytes written.
2125 */
2126 static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
2127 bool neg)
2128 {
2129 int len;
2130 char tmp[TMPBUFLEN], *p = tmp;
2131
2132 sprintf(p, "%s%lu", neg ? "-" : "", val);
2133 len = strlen(tmp);
2134 if (len > *size)
2135 len = *size;
2136 if (copy_to_user(*buf, tmp, len))
2137 return -EFAULT;
2138 *size -= len;
2139 *buf += len;
2140 return 0;
2141 }
2142 #undef TMPBUFLEN
2143
2144 static int proc_put_char(void __user **buf, size_t *size, char c)
2145 {
2146 if (*size) {
2147 char __user **buffer = (char __user **)buf;
2148 if (put_user(c, *buffer))
2149 return -EFAULT;
2150 (*size)--, (*buffer)++;
2151 *buf = *buffer;
2152 }
2153 return 0;
2154 }
2155
2156 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
2157 int *valp,
2158 int write, void *data)
2159 {
2160 if (write) {
2161 if (*negp) {
2162 if (*lvalp > (unsigned long) INT_MAX + 1)
2163 return -EINVAL;
2164 *valp = -*lvalp;
2165 } else {
2166 if (*lvalp > (unsigned long) INT_MAX)
2167 return -EINVAL;
2168 *valp = *lvalp;
2169 }
2170 } else {
2171 int val = *valp;
2172 if (val < 0) {
2173 *negp = true;
2174 *lvalp = -(unsigned long)val;
2175 } else {
2176 *negp = false;
2177 *lvalp = (unsigned long)val;
2178 }
2179 }
2180 return 0;
2181 }
2182
2183 static int do_proc_douintvec_conv(unsigned long *lvalp,
2184 unsigned int *valp,
2185 int write, void *data)
2186 {
2187 if (write) {
2188 if (*lvalp > UINT_MAX)
2189 return -EINVAL;
2190 if (*lvalp > UINT_MAX)
2191 return -EINVAL;
2192 *valp = *lvalp;
2193 } else {
2194 unsigned int val = *valp;
2195 *lvalp = (unsigned long)val;
2196 }
2197 return 0;
2198 }
2199
2200 static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
2201
2202 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
2203 int write, void __user *buffer,
2204 size_t *lenp, loff_t *ppos,
2205 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2206 int write, void *data),
2207 void *data)
2208 {
2209 int *i, vleft, first = 1, err = 0;
2210 size_t left;
2211 char *kbuf = NULL, *p;
2212
2213 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
2214 *lenp = 0;
2215 return 0;
2216 }
2217
2218 i = (int *) tbl_data;
2219 vleft = table->maxlen / sizeof(*i);
2220 left = *lenp;
2221
2222 if (!conv)
2223 conv = do_proc_dointvec_conv;
2224
2225 if (write) {
2226 if (proc_first_pos_non_zero_ignore(ppos, table))
2227 goto out;
2228
2229 if (left > PAGE_SIZE - 1)
2230 left = PAGE_SIZE - 1;
2231 p = kbuf = memdup_user_nul(buffer, left);
2232 if (IS_ERR(kbuf))
2233 return PTR_ERR(kbuf);
2234 }
2235
2236 for (; left && vleft--; i++, first=0) {
2237 unsigned long lval;
2238 bool neg;
2239
2240 if (write) {
2241 left -= proc_skip_spaces(&p);
2242
2243 if (!left)
2244 break;
2245 err = proc_get_long(&p, &left, &lval, &neg,
2246 proc_wspace_sep,
2247 sizeof(proc_wspace_sep), NULL);
2248 if (err)
2249 break;
2250 if (conv(&neg, &lval, i, 1, data)) {
2251 err = -EINVAL;
2252 break;
2253 }
2254 } else {
2255 if (conv(&neg, &lval, i, 0, data)) {
2256 err = -EINVAL;
2257 break;
2258 }
2259 if (!first)
2260 err = proc_put_char(&buffer, &left, '\t');
2261 if (err)
2262 break;
2263 err = proc_put_long(&buffer, &left, lval, neg);
2264 if (err)
2265 break;
2266 }
2267 }
2268
2269 if (!write && !first && left && !err)
2270 err = proc_put_char(&buffer, &left, '\n');
2271 if (write && !err && left)
2272 left -= proc_skip_spaces(&p);
2273 if (write) {
2274 kfree(kbuf);
2275 if (first)
2276 return err ? : -EINVAL;
2277 }
2278 *lenp -= left;
2279 out:
2280 *ppos += *lenp;
2281 return err;
2282 }
2283
2284 static int do_proc_dointvec(struct ctl_table *table, int write,
2285 void __user *buffer, size_t *lenp, loff_t *ppos,
2286 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2287 int write, void *data),
2288 void *data)
2289 {
2290 return __do_proc_dointvec(table->data, table, write,
2291 buffer, lenp, ppos, conv, data);
2292 }
2293
2294 static int do_proc_douintvec_w(unsigned int *tbl_data,
2295 struct ctl_table *table,
2296 void __user *buffer,
2297 size_t *lenp, loff_t *ppos,
2298 int (*conv)(unsigned long *lvalp,
2299 unsigned int *valp,
2300 int write, void *data),
2301 void *data)
2302 {
2303 unsigned long lval;
2304 int err = 0;
2305 size_t left;
2306 bool neg;
2307 char *kbuf = NULL, *p;
2308
2309 left = *lenp;
2310
2311 if (proc_first_pos_non_zero_ignore(ppos, table))
2312 goto bail_early;
2313
2314 if (left > PAGE_SIZE - 1)
2315 left = PAGE_SIZE - 1;
2316
2317 p = kbuf = memdup_user_nul(buffer, left);
2318 if (IS_ERR(kbuf))
2319 return -EINVAL;
2320
2321 left -= proc_skip_spaces(&p);
2322 if (!left) {
2323 err = -EINVAL;
2324 goto out_free;
2325 }
2326
2327 err = proc_get_long(&p, &left, &lval, &neg,
2328 proc_wspace_sep,
2329 sizeof(proc_wspace_sep), NULL);
2330 if (err || neg) {
2331 err = -EINVAL;
2332 goto out_free;
2333 }
2334
2335 if (conv(&lval, tbl_data, 1, data)) {
2336 err = -EINVAL;
2337 goto out_free;
2338 }
2339
2340 if (!err && left)
2341 left -= proc_skip_spaces(&p);
2342
2343 out_free:
2344 kfree(kbuf);
2345 if (err)
2346 return -EINVAL;
2347
2348 return 0;
2349
2350 /* This is in keeping with old __do_proc_dointvec() */
2351 bail_early:
2352 *ppos += *lenp;
2353 return err;
2354 }
2355
2356 static int do_proc_douintvec_r(unsigned int *tbl_data, void __user *buffer,
2357 size_t *lenp, loff_t *ppos,
2358 int (*conv)(unsigned long *lvalp,
2359 unsigned int *valp,
2360 int write, void *data),
2361 void *data)
2362 {
2363 unsigned long lval;
2364 int err = 0;
2365 size_t left;
2366
2367 left = *lenp;
2368
2369 if (conv(&lval, tbl_data, 0, data)) {
2370 err = -EINVAL;
2371 goto out;
2372 }
2373
2374 err = proc_put_long(&buffer, &left, lval, false);
2375 if (err || !left)
2376 goto out;
2377
2378 err = proc_put_char(&buffer, &left, '\n');
2379
2380 out:
2381 *lenp -= left;
2382 *ppos += *lenp;
2383
2384 return err;
2385 }
2386
2387 static int __do_proc_douintvec(void *tbl_data, struct ctl_table *table,
2388 int write, void __user *buffer,
2389 size_t *lenp, loff_t *ppos,
2390 int (*conv)(unsigned long *lvalp,
2391 unsigned int *valp,
2392 int write, void *data),
2393 void *data)
2394 {
2395 unsigned int *i, vleft;
2396
2397 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
2398 *lenp = 0;
2399 return 0;
2400 }
2401
2402 i = (unsigned int *) tbl_data;
2403 vleft = table->maxlen / sizeof(*i);
2404
2405 /*
2406 * Arrays are not supported, keep this simple. *Do not* add
2407 * support for them.
2408 */
2409 if (vleft != 1) {
2410 *lenp = 0;
2411 return -EINVAL;
2412 }
2413
2414 if (!conv)
2415 conv = do_proc_douintvec_conv;
2416
2417 if (write)
2418 return do_proc_douintvec_w(i, table, buffer, lenp, ppos,
2419 conv, data);
2420 return do_proc_douintvec_r(i, buffer, lenp, ppos, conv, data);
2421 }
2422
2423 static int do_proc_douintvec(struct ctl_table *table, int write,
2424 void __user *buffer, size_t *lenp, loff_t *ppos,
2425 int (*conv)(unsigned long *lvalp,
2426 unsigned int *valp,
2427 int write, void *data),
2428 void *data)
2429 {
2430 return __do_proc_douintvec(table->data, table, write,
2431 buffer, lenp, ppos, conv, data);
2432 }
2433
2434 /**
2435 * proc_dointvec - read a vector of integers
2436 * @table: the sysctl table
2437 * @write: %TRUE if this is a write to the sysctl file
2438 * @buffer: the user buffer
2439 * @lenp: the size of the user buffer
2440 * @ppos: file position
2441 *
2442 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2443 * values from/to the user buffer, treated as an ASCII string.
2444 *
2445 * Returns 0 on success.
2446 */
2447 int proc_dointvec(struct ctl_table *table, int write,
2448 void __user *buffer, size_t *lenp, loff_t *ppos)
2449 {
2450 return do_proc_dointvec(table, write, buffer, lenp, ppos, NULL, NULL);
2451 }
2452
2453 /**
2454 * proc_douintvec - read a vector of unsigned integers
2455 * @table: the sysctl table
2456 * @write: %TRUE if this is a write to the sysctl file
2457 * @buffer: the user buffer
2458 * @lenp: the size of the user buffer
2459 * @ppos: file position
2460 *
2461 * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
2462 * values from/to the user buffer, treated as an ASCII string.
2463 *
2464 * Returns 0 on success.
2465 */
2466 int proc_douintvec(struct ctl_table *table, int write,
2467 void __user *buffer, size_t *lenp, loff_t *ppos)
2468 {
2469 return do_proc_douintvec(table, write, buffer, lenp, ppos,
2470 do_proc_douintvec_conv, NULL);
2471 }
2472
2473 /*
2474 * Taint values can only be increased
2475 * This means we can safely use a temporary.
2476 */
2477 static int proc_taint(struct ctl_table *table, int write,
2478 void __user *buffer, size_t *lenp, loff_t *ppos)
2479 {
2480 struct ctl_table t;
2481 unsigned long tmptaint = get_taint();
2482 int err;
2483
2484 if (write && !capable(CAP_SYS_ADMIN))
2485 return -EPERM;
2486
2487 t = *table;
2488 t.data = &tmptaint;
2489 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
2490 if (err < 0)
2491 return err;
2492
2493 if (write) {
2494 /*
2495 * Poor man's atomic or. Not worth adding a primitive
2496 * to everyone's atomic.h for this
2497 */
2498 int i;
2499 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2500 if ((tmptaint >> i) & 1)
2501 add_taint(i, LOCKDEP_STILL_OK);
2502 }
2503 }
2504
2505 return err;
2506 }
2507
2508 #ifdef CONFIG_PRINTK
2509 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
2510 void __user *buffer, size_t *lenp, loff_t *ppos)
2511 {
2512 if (write && !capable(CAP_SYS_ADMIN))
2513 return -EPERM;
2514
2515 return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2516 }
2517 #endif
2518
2519 struct do_proc_dointvec_minmax_conv_param {
2520 int *min;
2521 int *max;
2522 };
2523
2524 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
2525 int *valp,
2526 int write, void *data)
2527 {
2528 struct do_proc_dointvec_minmax_conv_param *param = data;
2529 if (write) {
2530 int val = *negp ? -*lvalp : *lvalp;
2531 if ((param->min && *param->min > val) ||
2532 (param->max && *param->max < val))
2533 return -EINVAL;
2534 *valp = val;
2535 } else {
2536 int val = *valp;
2537 if (val < 0) {
2538 *negp = true;
2539 *lvalp = -(unsigned long)val;
2540 } else {
2541 *negp = false;
2542 *lvalp = (unsigned long)val;
2543 }
2544 }
2545 return 0;
2546 }
2547
2548 /**
2549 * proc_dointvec_minmax - read a vector of integers with min/max values
2550 * @table: the sysctl table
2551 * @write: %TRUE if this is a write to the sysctl file
2552 * @buffer: the user buffer
2553 * @lenp: the size of the user buffer
2554 * @ppos: file position
2555 *
2556 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2557 * values from/to the user buffer, treated as an ASCII string.
2558 *
2559 * This routine will ensure the values are within the range specified by
2560 * table->extra1 (min) and table->extra2 (max).
2561 *
2562 * Returns 0 on success.
2563 */
2564 int proc_dointvec_minmax(struct ctl_table *table, int write,
2565 void __user *buffer, size_t *lenp, loff_t *ppos)
2566 {
2567 struct do_proc_dointvec_minmax_conv_param param = {
2568 .min = (int *) table->extra1,
2569 .max = (int *) table->extra2,
2570 };
2571 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2572 do_proc_dointvec_minmax_conv, &param);
2573 }
2574
2575 struct do_proc_douintvec_minmax_conv_param {
2576 unsigned int *min;
2577 unsigned int *max;
2578 };
2579
2580 static int do_proc_douintvec_minmax_conv(unsigned long *lvalp,
2581 unsigned int *valp,
2582 int write, void *data)
2583 {
2584 struct do_proc_douintvec_minmax_conv_param *param = data;
2585
2586 if (write) {
2587 unsigned int val = *lvalp;
2588
2589 if ((param->min && *param->min > val) ||
2590 (param->max && *param->max < val))
2591 return -ERANGE;
2592
2593 if (*lvalp > UINT_MAX)
2594 return -EINVAL;
2595 *valp = val;
2596 } else {
2597 unsigned int val = *valp;
2598 *lvalp = (unsigned long) val;
2599 }
2600
2601 return 0;
2602 }
2603
2604 /**
2605 * proc_douintvec_minmax - read a vector of unsigned ints with min/max values
2606 * @table: the sysctl table
2607 * @write: %TRUE if this is a write to the sysctl file
2608 * @buffer: the user buffer
2609 * @lenp: the size of the user buffer
2610 * @ppos: file position
2611 *
2612 * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
2613 * values from/to the user buffer, treated as an ASCII string. Negative
2614 * strings are not allowed.
2615 *
2616 * This routine will ensure the values are within the range specified by
2617 * table->extra1 (min) and table->extra2 (max). There is a final sanity
2618 * check for UINT_MAX to avoid having to support wrap around uses from
2619 * userspace.
2620 *
2621 * Returns 0 on success.
2622 */
2623 int proc_douintvec_minmax(struct ctl_table *table, int write,
2624 void __user *buffer, size_t *lenp, loff_t *ppos)
2625 {
2626 struct do_proc_douintvec_minmax_conv_param param = {
2627 .min = (unsigned int *) table->extra1,
2628 .max = (unsigned int *) table->extra2,
2629 };
2630 return do_proc_douintvec(table, write, buffer, lenp, ppos,
2631 do_proc_douintvec_minmax_conv, &param);
2632 }
2633
2634 static void validate_coredump_safety(void)
2635 {
2636 #ifdef CONFIG_COREDUMP
2637 if (suid_dumpable == SUID_DUMP_ROOT &&
2638 core_pattern[0] != '/' && core_pattern[0] != '|') {
2639 printk(KERN_WARNING
2640 "Unsafe core_pattern used with fs.suid_dumpable=2.\n"
2641 "Pipe handler or fully qualified core dump path required.\n"
2642 "Set kernel.core_pattern before fs.suid_dumpable.\n"
2643 );
2644 }
2645 #endif
2646 }
2647
2648 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
2649 void __user *buffer, size_t *lenp, loff_t *ppos)
2650 {
2651 int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2652 if (!error)
2653 validate_coredump_safety();
2654 return error;
2655 }
2656
2657 #ifdef CONFIG_COREDUMP
2658 static int proc_dostring_coredump(struct ctl_table *table, int write,
2659 void __user *buffer, size_t *lenp, loff_t *ppos)
2660 {
2661 int error = proc_dostring(table, write, buffer, lenp, ppos);
2662 if (!error)
2663 validate_coredump_safety();
2664 return error;
2665 }
2666 #endif
2667
2668 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2669 void __user *buffer,
2670 size_t *lenp, loff_t *ppos,
2671 unsigned long convmul,
2672 unsigned long convdiv)
2673 {
2674 unsigned long *i, *min, *max;
2675 int vleft, first = 1, err = 0;
2676 size_t left;
2677 char *kbuf = NULL, *p;
2678
2679 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
2680 *lenp = 0;
2681 return 0;
2682 }
2683
2684 i = (unsigned long *) data;
2685 min = (unsigned long *) table->extra1;
2686 max = (unsigned long *) table->extra2;
2687 vleft = table->maxlen / sizeof(unsigned long);
2688 left = *lenp;
2689
2690 if (write) {
2691 if (proc_first_pos_non_zero_ignore(ppos, table))
2692 goto out;
2693
2694 if (left > PAGE_SIZE - 1)
2695 left = PAGE_SIZE - 1;
2696 p = kbuf = memdup_user_nul(buffer, left);
2697 if (IS_ERR(kbuf))
2698 return PTR_ERR(kbuf);
2699 }
2700
2701 for (; left && vleft--; i++, first = 0) {
2702 unsigned long val;
2703
2704 if (write) {
2705 bool neg;
2706
2707 left -= proc_skip_spaces(&p);
2708
2709 err = proc_get_long(&p, &left, &val, &neg,
2710 proc_wspace_sep,
2711 sizeof(proc_wspace_sep), NULL);
2712 if (err)
2713 break;
2714 if (neg)
2715 continue;
2716 val = convmul * val / convdiv;
2717 if ((min && val < *min) || (max && val > *max))
2718 continue;
2719 *i = val;
2720 } else {
2721 val = convdiv * (*i) / convmul;
2722 if (!first) {
2723 err = proc_put_char(&buffer, &left, '\t');
2724 if (err)
2725 break;
2726 }
2727 err = proc_put_long(&buffer, &left, val, false);
2728 if (err)
2729 break;
2730 }
2731 }
2732
2733 if (!write && !first && left && !err)
2734 err = proc_put_char(&buffer, &left, '\n');
2735 if (write && !err)
2736 left -= proc_skip_spaces(&p);
2737 if (write) {
2738 kfree(kbuf);
2739 if (first)
2740 return err ? : -EINVAL;
2741 }
2742 *lenp -= left;
2743 out:
2744 *ppos += *lenp;
2745 return err;
2746 }
2747
2748 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2749 void __user *buffer,
2750 size_t *lenp, loff_t *ppos,
2751 unsigned long convmul,
2752 unsigned long convdiv)
2753 {
2754 return __do_proc_doulongvec_minmax(table->data, table, write,
2755 buffer, lenp, ppos, convmul, convdiv);
2756 }
2757
2758 /**
2759 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2760 * @table: the sysctl table
2761 * @write: %TRUE if this is a write to the sysctl file
2762 * @buffer: the user buffer
2763 * @lenp: the size of the user buffer
2764 * @ppos: file position
2765 *
2766 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2767 * values from/to the user buffer, treated as an ASCII string.
2768 *
2769 * This routine will ensure the values are within the range specified by
2770 * table->extra1 (min) and table->extra2 (max).
2771 *
2772 * Returns 0 on success.
2773 */
2774 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2775 void __user *buffer, size_t *lenp, loff_t *ppos)
2776 {
2777 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
2778 }
2779
2780 /**
2781 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2782 * @table: the sysctl table
2783 * @write: %TRUE if this is a write to the sysctl file
2784 * @buffer: the user buffer
2785 * @lenp: the size of the user buffer
2786 * @ppos: file position
2787 *
2788 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2789 * values from/to the user buffer, treated as an ASCII string. The values
2790 * are treated as milliseconds, and converted to jiffies when they are stored.
2791 *
2792 * This routine will ensure the values are within the range specified by
2793 * table->extra1 (min) and table->extra2 (max).
2794 *
2795 * Returns 0 on success.
2796 */
2797 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2798 void __user *buffer,
2799 size_t *lenp, loff_t *ppos)
2800 {
2801 return do_proc_doulongvec_minmax(table, write, buffer,
2802 lenp, ppos, HZ, 1000l);
2803 }
2804
2805
2806 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
2807 int *valp,
2808 int write, void *data)
2809 {
2810 if (write) {
2811 if (*lvalp > INT_MAX / HZ)
2812 return 1;
2813 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2814 } else {
2815 int val = *valp;
2816 unsigned long lval;
2817 if (val < 0) {
2818 *negp = true;
2819 lval = -(unsigned long)val;
2820 } else {
2821 *negp = false;
2822 lval = (unsigned long)val;
2823 }
2824 *lvalp = lval / HZ;
2825 }
2826 return 0;
2827 }
2828
2829 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
2830 int *valp,
2831 int write, void *data)
2832 {
2833 if (write) {
2834 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2835 return 1;
2836 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2837 } else {
2838 int val = *valp;
2839 unsigned long lval;
2840 if (val < 0) {
2841 *negp = true;
2842 lval = -(unsigned long)val;
2843 } else {
2844 *negp = false;
2845 lval = (unsigned long)val;
2846 }
2847 *lvalp = jiffies_to_clock_t(lval);
2848 }
2849 return 0;
2850 }
2851
2852 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
2853 int *valp,
2854 int write, void *data)
2855 {
2856 if (write) {
2857 unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2858
2859 if (jif > INT_MAX)
2860 return 1;
2861 *valp = (int)jif;
2862 } else {
2863 int val = *valp;
2864 unsigned long lval;
2865 if (val < 0) {
2866 *negp = true;
2867 lval = -(unsigned long)val;
2868 } else {
2869 *negp = false;
2870 lval = (unsigned long)val;
2871 }
2872 *lvalp = jiffies_to_msecs(lval);
2873 }
2874 return 0;
2875 }
2876
2877 /**
2878 * proc_dointvec_jiffies - read a vector of integers as seconds
2879 * @table: the sysctl table
2880 * @write: %TRUE if this is a write to the sysctl file
2881 * @buffer: the user buffer
2882 * @lenp: the size of the user buffer
2883 * @ppos: file position
2884 *
2885 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2886 * values from/to the user buffer, treated as an ASCII string.
2887 * The values read are assumed to be in seconds, and are converted into
2888 * jiffies.
2889 *
2890 * Returns 0 on success.
2891 */
2892 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2893 void __user *buffer, size_t *lenp, loff_t *ppos)
2894 {
2895 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2896 do_proc_dointvec_jiffies_conv,NULL);
2897 }
2898
2899 /**
2900 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2901 * @table: the sysctl table
2902 * @write: %TRUE if this is a write to the sysctl file
2903 * @buffer: the user buffer
2904 * @lenp: the size of the user buffer
2905 * @ppos: pointer to the file position
2906 *
2907 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2908 * values from/to the user buffer, treated as an ASCII string.
2909 * The values read are assumed to be in 1/USER_HZ seconds, and
2910 * are converted into jiffies.
2911 *
2912 * Returns 0 on success.
2913 */
2914 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2915 void __user *buffer, size_t *lenp, loff_t *ppos)
2916 {
2917 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2918 do_proc_dointvec_userhz_jiffies_conv,NULL);
2919 }
2920
2921 /**
2922 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2923 * @table: the sysctl table
2924 * @write: %TRUE if this is a write to the sysctl file
2925 * @buffer: the user buffer
2926 * @lenp: the size of the user buffer
2927 * @ppos: file position
2928 * @ppos: the current position in the file
2929 *
2930 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2931 * values from/to the user buffer, treated as an ASCII string.
2932 * The values read are assumed to be in 1/1000 seconds, and
2933 * are converted into jiffies.
2934 *
2935 * Returns 0 on success.
2936 */
2937 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2938 void __user *buffer, size_t *lenp, loff_t *ppos)
2939 {
2940 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2941 do_proc_dointvec_ms_jiffies_conv, NULL);
2942 }
2943
2944 static int proc_do_cad_pid(struct ctl_table *table, int write,
2945 void __user *buffer, size_t *lenp, loff_t *ppos)
2946 {
2947 struct pid *new_pid;
2948 pid_t tmp;
2949 int r;
2950
2951 tmp = pid_vnr(cad_pid);
2952
2953 r = __do_proc_dointvec(&tmp, table, write, buffer,
2954 lenp, ppos, NULL, NULL);
2955 if (r || !write)
2956 return r;
2957
2958 new_pid = find_get_pid(tmp);
2959 if (!new_pid)
2960 return -ESRCH;
2961
2962 put_pid(xchg(&cad_pid, new_pid));
2963 return 0;
2964 }
2965
2966 /**
2967 * proc_do_large_bitmap - read/write from/to a large bitmap
2968 * @table: the sysctl table
2969 * @write: %TRUE if this is a write to the sysctl file
2970 * @buffer: the user buffer
2971 * @lenp: the size of the user buffer
2972 * @ppos: file position
2973 *
2974 * The bitmap is stored at table->data and the bitmap length (in bits)
2975 * in table->maxlen.
2976 *
2977 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2978 * large bitmaps may be represented in a compact manner. Writing into
2979 * the file will clear the bitmap then update it with the given input.
2980 *
2981 * Returns 0 on success.
2982 */
2983 int proc_do_large_bitmap(struct ctl_table *table, int write,
2984 void __user *buffer, size_t *lenp, loff_t *ppos)
2985 {
2986 int err = 0;
2987 bool first = 1;
2988 size_t left = *lenp;
2989 unsigned long bitmap_len = table->maxlen;
2990 unsigned long *bitmap = *(unsigned long **) table->data;
2991 unsigned long *tmp_bitmap = NULL;
2992 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
2993
2994 if (!bitmap || !bitmap_len || !left || (*ppos && !write)) {
2995 *lenp = 0;
2996 return 0;
2997 }
2998
2999 if (write) {
3000 char *kbuf, *p;
3001
3002 if (left > PAGE_SIZE - 1)
3003 left = PAGE_SIZE - 1;
3004
3005 p = kbuf = memdup_user_nul(buffer, left);
3006 if (IS_ERR(kbuf))
3007 return PTR_ERR(kbuf);
3008
3009 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long),
3010 GFP_KERNEL);
3011 if (!tmp_bitmap) {
3012 kfree(kbuf);
3013 return -ENOMEM;
3014 }
3015 proc_skip_char(&p, &left, '\n');
3016 while (!err && left) {
3017 unsigned long val_a, val_b;
3018 bool neg;
3019
3020 err = proc_get_long(&p, &left, &val_a, &neg, tr_a,
3021 sizeof(tr_a), &c);
3022 if (err)
3023 break;
3024 if (val_a >= bitmap_len || neg) {
3025 err = -EINVAL;
3026 break;
3027 }
3028
3029 val_b = val_a;
3030 if (left) {
3031 p++;
3032 left--;
3033 }
3034
3035 if (c == '-') {
3036 err = proc_get_long(&p, &left, &val_b,
3037 &neg, tr_b, sizeof(tr_b),
3038 &c);
3039 if (err)
3040 break;
3041 if (val_b >= bitmap_len || neg ||
3042 val_a > val_b) {
3043 err = -EINVAL;
3044 break;
3045 }
3046 if (left) {
3047 p++;
3048 left--;
3049 }
3050 }
3051
3052 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
3053 first = 0;
3054 proc_skip_char(&p, &left, '\n');
3055 }
3056 kfree(kbuf);
3057 } else {
3058 unsigned long bit_a, bit_b = 0;
3059
3060 while (left) {
3061 bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
3062 if (bit_a >= bitmap_len)
3063 break;
3064 bit_b = find_next_zero_bit(bitmap, bitmap_len,
3065 bit_a + 1) - 1;
3066
3067 if (!first) {
3068 err = proc_put_char(&buffer, &left, ',');
3069 if (err)
3070 break;
3071 }
3072 err = proc_put_long(&buffer, &left, bit_a, false);
3073 if (err)
3074 break;
3075 if (bit_a != bit_b) {
3076 err = proc_put_char(&buffer, &left, '-');
3077 if (err)
3078 break;
3079 err = proc_put_long(&buffer, &left, bit_b, false);
3080 if (err)
3081 break;
3082 }
3083
3084 first = 0; bit_b++;
3085 }
3086 if (!err)
3087 err = proc_put_char(&buffer, &left, '\n');
3088 }
3089
3090 if (!err) {
3091 if (write) {
3092 if (*ppos)
3093 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
3094 else
3095 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
3096 }
3097 kfree(tmp_bitmap);
3098 *lenp -= left;
3099 *ppos += *lenp;
3100 return 0;
3101 } else {
3102 kfree(tmp_bitmap);
3103 return err;
3104 }
3105 }
3106
3107 #else /* CONFIG_PROC_SYSCTL */
3108
3109 int proc_dostring(struct ctl_table *table, int write,
3110 void __user *buffer, size_t *lenp, loff_t *ppos)
3111 {
3112 return -ENOSYS;
3113 }
3114
3115 int proc_dointvec(struct ctl_table *table, int write,
3116 void __user *buffer, size_t *lenp, loff_t *ppos)
3117 {
3118 return -ENOSYS;
3119 }
3120
3121 int proc_douintvec(struct ctl_table *table, int write,
3122 void __user *buffer, size_t *lenp, loff_t *ppos)
3123 {
3124 return -ENOSYS;
3125 }
3126
3127 int proc_dointvec_minmax(struct ctl_table *table, int write,
3128 void __user *buffer, size_t *lenp, loff_t *ppos)
3129 {
3130 return -ENOSYS;
3131 }
3132
3133 int proc_douintvec_minmax(struct ctl_table *table, int write,
3134 void __user *buffer, size_t *lenp, loff_t *ppos)
3135 {
3136 return -ENOSYS;
3137 }
3138
3139 int proc_dointvec_jiffies(struct ctl_table *table, int write,
3140 void __user *buffer, size_t *lenp, loff_t *ppos)
3141 {
3142 return -ENOSYS;
3143 }
3144
3145 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
3146 void __user *buffer, size_t *lenp, loff_t *ppos)
3147 {
3148 return -ENOSYS;
3149 }
3150
3151 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
3152 void __user *buffer, size_t *lenp, loff_t *ppos)
3153 {
3154 return -ENOSYS;
3155 }
3156
3157 int proc_doulongvec_minmax(struct ctl_table *table, int write,
3158 void __user *buffer, size_t *lenp, loff_t *ppos)
3159 {
3160 return -ENOSYS;
3161 }
3162
3163 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
3164 void __user *buffer,
3165 size_t *lenp, loff_t *ppos)
3166 {
3167 return -ENOSYS;
3168 }
3169
3170
3171 #endif /* CONFIG_PROC_SYSCTL */
3172
3173 /*
3174 * No sense putting this after each symbol definition, twice,
3175 * exception granted :-)
3176 */
3177 EXPORT_SYMBOL(proc_dointvec);
3178 EXPORT_SYMBOL(proc_douintvec);
3179 EXPORT_SYMBOL(proc_dointvec_jiffies);
3180 EXPORT_SYMBOL(proc_dointvec_minmax);
3181 EXPORT_SYMBOL_GPL(proc_douintvec_minmax);
3182 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
3183 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
3184 EXPORT_SYMBOL(proc_dostring);
3185 EXPORT_SYMBOL(proc_doulongvec_minmax);
3186 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
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