projects / GitHub / moto-9609 / android_kernel_motorola_exynos9610.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
Merge tag 'v4.14-rockchip-dts64fixes-2' of git://git.kernel.org/pub/scm/linux/kernel...
[GitHub/moto-9609/android_kernel_motorola_exynos9610.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_minmax,
371 .extra1 = &one,
372 },
373 #ifdef CONFIG_SCHEDSTATS
374 {
375 .procname = "sched_schedstats",
376 .data = NULL,
377 .maxlen = sizeof(unsigned int),
378 .mode = 0644,
379 .proc_handler = sysctl_schedstats,
380 .extra1 = &zero,
381 .extra2 = &one,
382 },
383 #endif /* CONFIG_SCHEDSTATS */
384 #endif /* CONFIG_SMP */
385 #ifdef CONFIG_NUMA_BALANCING
386 {
387 .procname = "numa_balancing_scan_delay_ms",
388 .data = &sysctl_numa_balancing_scan_delay,
389 .maxlen = sizeof(unsigned int),
390 .mode = 0644,
391 .proc_handler = proc_dointvec,
392 },
393 {
394 .procname = "numa_balancing_scan_period_min_ms",
395 .data = &sysctl_numa_balancing_scan_period_min,
396 .maxlen = sizeof(unsigned int),
397 .mode = 0644,
398 .proc_handler = proc_dointvec,
399 },
400 {
401 .procname = "numa_balancing_scan_period_max_ms",
402 .data = &sysctl_numa_balancing_scan_period_max,
403 .maxlen = sizeof(unsigned int),
404 .mode = 0644,
405 .proc_handler = proc_dointvec,
406 },
407 {
408 .procname = "numa_balancing_scan_size_mb",
409 .data = &sysctl_numa_balancing_scan_size,
410 .maxlen = sizeof(unsigned int),
411 .mode = 0644,
412 .proc_handler = proc_dointvec_minmax,
413 .extra1 = &one,
414 },
415 {
416 .procname = "numa_balancing",
417 .data = NULL, /* filled in by handler */
418 .maxlen = sizeof(unsigned int),
419 .mode = 0644,
420 .proc_handler = sysctl_numa_balancing,
421 .extra1 = &zero,
422 .extra2 = &one,
423 },
424 #endif /* CONFIG_NUMA_BALANCING */
425 #endif /* CONFIG_SCHED_DEBUG */
426 {
427 .procname = "sched_rt_period_us",
428 .data = &sysctl_sched_rt_period,
429 .maxlen = sizeof(unsigned int),
430 .mode = 0644,
431 .proc_handler = sched_rt_handler,
432 },
433 {
434 .procname = "sched_rt_runtime_us",
435 .data = &sysctl_sched_rt_runtime,
436 .maxlen = sizeof(int),
437 .mode = 0644,
438 .proc_handler = sched_rt_handler,
439 },
440 {
441 .procname = "sched_rr_timeslice_ms",
442 .data = &sysctl_sched_rr_timeslice,
443 .maxlen = sizeof(int),
444 .mode = 0644,
445 .proc_handler = sched_rr_handler,
446 },
447 #ifdef CONFIG_SCHED_AUTOGROUP
448 {
449 .procname = "sched_autogroup_enabled",
450 .data = &sysctl_sched_autogroup_enabled,
451 .maxlen = sizeof(unsigned int),
452 .mode = 0644,
453 .proc_handler = proc_dointvec_minmax,
454 .extra1 = &zero,
455 .extra2 = &one,
456 },
457 #endif
458 #ifdef CONFIG_CFS_BANDWIDTH
459 {
460 .procname = "sched_cfs_bandwidth_slice_us",
461 .data = &sysctl_sched_cfs_bandwidth_slice,
462 .maxlen = sizeof(unsigned int),
463 .mode = 0644,
464 .proc_handler = proc_dointvec_minmax,
465 .extra1 = &one,
466 },
467 #endif
468 #ifdef CONFIG_PROVE_LOCKING
469 {
470 .procname = "prove_locking",
471 .data = &prove_locking,
472 .maxlen = sizeof(int),
473 .mode = 0644,
474 .proc_handler = proc_dointvec,
475 },
476 #endif
477 #ifdef CONFIG_LOCK_STAT
478 {
479 .procname = "lock_stat",
480 .data = &lock_stat,
481 .maxlen = sizeof(int),
482 .mode = 0644,
483 .proc_handler = proc_dointvec,
484 },
485 #endif
486 {
487 .procname = "panic",
488 .data = &panic_timeout,
489 .maxlen = sizeof(int),
490 .mode = 0644,
491 .proc_handler = proc_dointvec,
492 },
493 #ifdef CONFIG_COREDUMP
494 {
495 .procname = "core_uses_pid",
496 .data = &core_uses_pid,
497 .maxlen = sizeof(int),
498 .mode = 0644,
499 .proc_handler = proc_dointvec,
500 },
501 {
502 .procname = "core_pattern",
503 .data = core_pattern,
504 .maxlen = CORENAME_MAX_SIZE,
505 .mode = 0644,
506 .proc_handler = proc_dostring_coredump,
507 },
508 {
509 .procname = "core_pipe_limit",
510 .data = &core_pipe_limit,
511 .maxlen = sizeof(unsigned int),
512 .mode = 0644,
513 .proc_handler = proc_dointvec,
514 },
515 #endif
516 #ifdef CONFIG_PROC_SYSCTL
517 {
518 .procname = "tainted",
519 .maxlen = sizeof(long),
520 .mode = 0644,
521 .proc_handler = proc_taint,
522 },
523 {
524 .procname = "sysctl_writes_strict",
525 .data = &sysctl_writes_strict,
526 .maxlen = sizeof(int),
527 .mode = 0644,
528 .proc_handler = proc_dointvec_minmax,
529 .extra1 = &neg_one,
530 .extra2 = &one,
531 },
532 #endif
533 #ifdef CONFIG_LATENCYTOP
534 {
535 .procname = "latencytop",
536 .data = &latencytop_enabled,
537 .maxlen = sizeof(int),
538 .mode = 0644,
539 .proc_handler = sysctl_latencytop,
540 },
541 #endif
542 #ifdef CONFIG_BLK_DEV_INITRD
543 {
544 .procname = "real-root-dev",
545 .data = &real_root_dev,
546 .maxlen = sizeof(int),
547 .mode = 0644,
548 .proc_handler = proc_dointvec,
549 },
550 #endif
551 {
552 .procname = "print-fatal-signals",
553 .data = &print_fatal_signals,
554 .maxlen = sizeof(int),
555 .mode = 0644,
556 .proc_handler = proc_dointvec,
557 },
558 #ifdef CONFIG_SPARC
559 {
560 .procname = "reboot-cmd",
561 .data = reboot_command,
562 .maxlen = 256,
563 .mode = 0644,
564 .proc_handler = proc_dostring,
565 },
566 {
567 .procname = "stop-a",
568 .data = &stop_a_enabled,
569 .maxlen = sizeof (int),
570 .mode = 0644,
571 .proc_handler = proc_dointvec,
572 },
573 {
574 .procname = "scons-poweroff",
575 .data = &scons_pwroff,
576 .maxlen = sizeof (int),
577 .mode = 0644,
578 .proc_handler = proc_dointvec,
579 },
580 #endif
581 #ifdef CONFIG_SPARC64
582 {
583 .procname = "tsb-ratio",
584 .data = &sysctl_tsb_ratio,
585 .maxlen = sizeof (int),
586 .mode = 0644,
587 .proc_handler = proc_dointvec,
588 },
589 #endif
590 #ifdef __hppa__
591 {
592 .procname = "soft-power",
593 .data = &pwrsw_enabled,
594 .maxlen = sizeof (int),
595 .mode = 0644,
596 .proc_handler = proc_dointvec,
597 },
598 #endif
599 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
600 {
601 .procname = "unaligned-trap",
602 .data = &unaligned_enabled,
603 .maxlen = sizeof (int),
604 .mode = 0644,
605 .proc_handler = proc_dointvec,
606 },
607 #endif
608 {
609 .procname = "ctrl-alt-del",
610 .data = &C_A_D,
611 .maxlen = sizeof(int),
612 .mode = 0644,
613 .proc_handler = proc_dointvec,
614 },
615 #ifdef CONFIG_FUNCTION_TRACER
616 {
617 .procname = "ftrace_enabled",
618 .data = &ftrace_enabled,
619 .maxlen = sizeof(int),
620 .mode = 0644,
621 .proc_handler = ftrace_enable_sysctl,
622 },
623 #endif
624 #ifdef CONFIG_STACK_TRACER
625 {
626 .procname = "stack_tracer_enabled",
627 .data = &stack_tracer_enabled,
628 .maxlen = sizeof(int),
629 .mode = 0644,
630 .proc_handler = stack_trace_sysctl,
631 },
632 #endif
633 #ifdef CONFIG_TRACING
634 {
635 .procname = "ftrace_dump_on_oops",
636 .data = &ftrace_dump_on_oops,
637 .maxlen = sizeof(int),
638 .mode = 0644,
639 .proc_handler = proc_dointvec,
640 },
641 {
642 .procname = "traceoff_on_warning",
643 .data = &__disable_trace_on_warning,
644 .maxlen = sizeof(__disable_trace_on_warning),
645 .mode = 0644,
646 .proc_handler = proc_dointvec,
647 },
648 {
649 .procname = "tracepoint_printk",
650 .data = &tracepoint_printk,
651 .maxlen = sizeof(tracepoint_printk),
652 .mode = 0644,
653 .proc_handler = tracepoint_printk_sysctl,
654 },
655 #endif
656 #ifdef CONFIG_KEXEC_CORE
657 {
658 .procname = "kexec_load_disabled",
659 .data = &kexec_load_disabled,
660 .maxlen = sizeof(int),
661 .mode = 0644,
662 /* only handle a transition from default "0" to "1" */
663 .proc_handler = proc_dointvec_minmax,
664 .extra1 = &one,
665 .extra2 = &one,
666 },
667 #endif
668 #ifdef CONFIG_MODULES
669 {
670 .procname = "modprobe",
671 .data = &modprobe_path,
672 .maxlen = KMOD_PATH_LEN,
673 .mode = 0644,
674 .proc_handler = proc_dostring,
675 },
676 {
677 .procname = "modules_disabled",
678 .data = &modules_disabled,
679 .maxlen = sizeof(int),
680 .mode = 0644,
681 /* only handle a transition from default "0" to "1" */
682 .proc_handler = proc_dointvec_minmax,
683 .extra1 = &one,
684 .extra2 = &one,
685 },
686 #endif
687 #ifdef CONFIG_UEVENT_HELPER
688 {
689 .procname = "hotplug",
690 .data = &uevent_helper,
691 .maxlen = UEVENT_HELPER_PATH_LEN,
692 .mode = 0644,
693 .proc_handler = proc_dostring,
694 },
695 #endif
696 #ifdef CONFIG_CHR_DEV_SG
697 {
698 .procname = "sg-big-buff",
699 .data = &sg_big_buff,
700 .maxlen = sizeof (int),
701 .mode = 0444,
702 .proc_handler = proc_dointvec,
703 },
704 #endif
705 #ifdef CONFIG_BSD_PROCESS_ACCT
706 {
707 .procname = "acct",
708 .data = &acct_parm,
709 .maxlen = 3*sizeof(int),
710 .mode = 0644,
711 .proc_handler = proc_dointvec,
712 },
713 #endif
714 #ifdef CONFIG_MAGIC_SYSRQ
715 {
716 .procname = "sysrq",
717 .data = &__sysrq_enabled,
718 .maxlen = sizeof (int),
719 .mode = 0644,
720 .proc_handler = sysrq_sysctl_handler,
721 },
722 #endif
723 #ifdef CONFIG_PROC_SYSCTL
724 {
725 .procname = "cad_pid",
726 .data = NULL,
727 .maxlen = sizeof (int),
728 .mode = 0600,
729 .proc_handler = proc_do_cad_pid,
730 },
731 #endif
732 {
733 .procname = "threads-max",
734 .data = NULL,
735 .maxlen = sizeof(int),
736 .mode = 0644,
737 .proc_handler = sysctl_max_threads,
738 },
739 {
740 .procname = "random",
741 .mode = 0555,
742 .child = random_table,
743 },
744 {
745 .procname = "usermodehelper",
746 .mode = 0555,
747 .child = usermodehelper_table,
748 },
749 {
750 .procname = "overflowuid",
751 .data = &overflowuid,
752 .maxlen = sizeof(int),
753 .mode = 0644,
754 .proc_handler = proc_dointvec_minmax,
755 .extra1 = &minolduid,
756 .extra2 = &maxolduid,
757 },
758 {
759 .procname = "overflowgid",
760 .data = &overflowgid,
761 .maxlen = sizeof(int),
762 .mode = 0644,
763 .proc_handler = proc_dointvec_minmax,
764 .extra1 = &minolduid,
765 .extra2 = &maxolduid,
766 },
767 #ifdef CONFIG_S390
768 #ifdef CONFIG_MATHEMU
769 {
770 .procname = "ieee_emulation_warnings",
771 .data = &sysctl_ieee_emulation_warnings,
772 .maxlen = sizeof(int),
773 .mode = 0644,
774 .proc_handler = proc_dointvec,
775 },
776 #endif
777 {
778 .procname = "userprocess_debug",
779 .data = &show_unhandled_signals,
780 .maxlen = sizeof(int),
781 .mode = 0644,
782 .proc_handler = proc_dointvec,
783 },
784 #endif
785 {
786 .procname = "pid_max",
787 .data = &pid_max,
788 .maxlen = sizeof (int),
789 .mode = 0644,
790 .proc_handler = proc_dointvec_minmax,
791 .extra1 = &pid_max_min,
792 .extra2 = &pid_max_max,
793 },
794 {
795 .procname = "panic_on_oops",
796 .data = &panic_on_oops,
797 .maxlen = sizeof(int),
798 .mode = 0644,
799 .proc_handler = proc_dointvec,
800 },
801 #if defined CONFIG_PRINTK
802 {
803 .procname = "printk",
804 .data = &console_loglevel,
805 .maxlen = 4*sizeof(int),
806 .mode = 0644,
807 .proc_handler = proc_dointvec,
808 },
809 {
810 .procname = "printk_ratelimit",
811 .data = &printk_ratelimit_state.interval,
812 .maxlen = sizeof(int),
813 .mode = 0644,
814 .proc_handler = proc_dointvec_jiffies,
815 },
816 {
817 .procname = "printk_ratelimit_burst",
818 .data = &printk_ratelimit_state.burst,
819 .maxlen = sizeof(int),
820 .mode = 0644,
821 .proc_handler = proc_dointvec,
822 },
823 {
824 .procname = "printk_delay",
825 .data = &printk_delay_msec,
826 .maxlen = sizeof(int),
827 .mode = 0644,
828 .proc_handler = proc_dointvec_minmax,
829 .extra1 = &zero,
830 .extra2 = &ten_thousand,
831 },
832 {
833 .procname = "printk_devkmsg",
834 .data = devkmsg_log_str,
835 .maxlen = DEVKMSG_STR_MAX_SIZE,
836 .mode = 0644,
837 .proc_handler = devkmsg_sysctl_set_loglvl,
838 },
839 {
840 .procname = "dmesg_restrict",
841 .data = &dmesg_restrict,
842 .maxlen = sizeof(int),
843 .mode = 0644,
844 .proc_handler = proc_dointvec_minmax_sysadmin,
845 .extra1 = &zero,
846 .extra2 = &one,
847 },
848 {
849 .procname = "kptr_restrict",
850 .data = &kptr_restrict,
851 .maxlen = sizeof(int),
852 .mode = 0644,
853 .proc_handler = proc_dointvec_minmax_sysadmin,
854 .extra1 = &zero,
855 .extra2 = &two,
856 },
857 #endif
858 {
859 .procname = "ngroups_max",
860 .data = &ngroups_max,
861 .maxlen = sizeof (int),
862 .mode = 0444,
863 .proc_handler = proc_dointvec,
864 },
865 {
866 .procname = "cap_last_cap",
867 .data = (void *)&cap_last_cap,
868 .maxlen = sizeof(int),
869 .mode = 0444,
870 .proc_handler = proc_dointvec,
871 },
872 #if defined(CONFIG_LOCKUP_DETECTOR)
873 {
874 .procname = "watchdog",
875 .data = &watchdog_user_enabled,
876 .maxlen = sizeof(int),
877 .mode = 0644,
878 .proc_handler = proc_watchdog,
879 .extra1 = &zero,
880 .extra2 = &one,
881 },
882 {
883 .procname = "watchdog_thresh",
884 .data = &watchdog_thresh,
885 .maxlen = sizeof(int),
886 .mode = 0644,
887 .proc_handler = proc_watchdog_thresh,
888 .extra1 = &zero,
889 .extra2 = &sixty,
890 },
891 {
892 .procname = "nmi_watchdog",
893 .data = &nmi_watchdog_user_enabled,
894 .maxlen = sizeof(int),
895 .mode = NMI_WATCHDOG_SYSCTL_PERM,
896 .proc_handler = proc_nmi_watchdog,
897 .extra1 = &zero,
898 .extra2 = &one,
899 },
900 {
901 .procname = "watchdog_cpumask",
902 .data = &watchdog_cpumask_bits,
903 .maxlen = NR_CPUS,
904 .mode = 0644,
905 .proc_handler = proc_watchdog_cpumask,
906 },
907 #ifdef CONFIG_SOFTLOCKUP_DETECTOR
908 {
909 .procname = "soft_watchdog",
910 .data = &soft_watchdog_user_enabled,
911 .maxlen = sizeof(int),
912 .mode = 0644,
913 .proc_handler = proc_soft_watchdog,
914 .extra1 = &zero,
915 .extra2 = &one,
916 },
917 {
918 .procname = "softlockup_panic",
919 .data = &softlockup_panic,
920 .maxlen = sizeof(int),
921 .mode = 0644,
922 .proc_handler = proc_dointvec_minmax,
923 .extra1 = &zero,
924 .extra2 = &one,
925 },
926 #ifdef CONFIG_SMP
927 {
928 .procname = "softlockup_all_cpu_backtrace",
929 .data = &sysctl_softlockup_all_cpu_backtrace,
930 .maxlen = sizeof(int),
931 .mode = 0644,
932 .proc_handler = proc_dointvec_minmax,
933 .extra1 = &zero,
934 .extra2 = &one,
935 },
936 #endif /* CONFIG_SMP */
937 #endif
938 #ifdef CONFIG_HARDLOCKUP_DETECTOR
939 {
940 .procname = "hardlockup_panic",
941 .data = &hardlockup_panic,
942 .maxlen = sizeof(int),
943 .mode = 0644,
944 .proc_handler = proc_dointvec_minmax,
945 .extra1 = &zero,
946 .extra2 = &one,
947 },
948 #ifdef CONFIG_SMP
949 {
950 .procname = "hardlockup_all_cpu_backtrace",
951 .data = &sysctl_hardlockup_all_cpu_backtrace,
952 .maxlen = sizeof(int),
953 .mode = 0644,
954 .proc_handler = proc_dointvec_minmax,
955 .extra1 = &zero,
956 .extra2 = &one,
957 },
958 #endif /* CONFIG_SMP */
959 #endif
960 #endif
961
962 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
963 {
964 .procname = "unknown_nmi_panic",
965 .data = &unknown_nmi_panic,
966 .maxlen = sizeof (int),
967 .mode = 0644,
968 .proc_handler = proc_dointvec,
969 },
970 #endif
971 #if defined(CONFIG_X86)
972 {
973 .procname = "panic_on_unrecovered_nmi",
974 .data = &panic_on_unrecovered_nmi,
975 .maxlen = sizeof(int),
976 .mode = 0644,
977 .proc_handler = proc_dointvec,
978 },
979 {
980 .procname = "panic_on_io_nmi",
981 .data = &panic_on_io_nmi,
982 .maxlen = sizeof(int),
983 .mode = 0644,
984 .proc_handler = proc_dointvec,
985 },
986 #ifdef CONFIG_DEBUG_STACKOVERFLOW
987 {
988 .procname = "panic_on_stackoverflow",
989 .data = &sysctl_panic_on_stackoverflow,
990 .maxlen = sizeof(int),
991 .mode = 0644,
992 .proc_handler = proc_dointvec,
993 },
994 #endif
995 {
996 .procname = "bootloader_type",
997 .data = &bootloader_type,
998 .maxlen = sizeof (int),
999 .mode = 0444,
1000 .proc_handler = proc_dointvec,
1001 },
1002 {
1003 .procname = "bootloader_version",
1004 .data = &bootloader_version,
1005 .maxlen = sizeof (int),
1006 .mode = 0444,
1007 .proc_handler = proc_dointvec,
1008 },
1009 {
1010 .procname = "io_delay_type",
1011 .data = &io_delay_type,
1012 .maxlen = sizeof(int),
1013 .mode = 0644,
1014 .proc_handler = proc_dointvec,
1015 },
1016 #endif
1017 #if defined(CONFIG_MMU)
1018 {
1019 .procname = "randomize_va_space",
1020 .data = &randomize_va_space,
1021 .maxlen = sizeof(int),
1022 .mode = 0644,
1023 .proc_handler = proc_dointvec,
1024 },
1025 #endif
1026 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
1027 {
1028 .procname = "spin_retry",
1029 .data = &spin_retry,
1030 .maxlen = sizeof (int),
1031 .mode = 0644,
1032 .proc_handler = proc_dointvec,
1033 },
1034 #endif
1035 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
1036 {
1037 .procname = "acpi_video_flags",
1038 .data = &acpi_realmode_flags,
1039 .maxlen = sizeof (unsigned long),
1040 .mode = 0644,
1041 .proc_handler = proc_doulongvec_minmax,
1042 },
1043 #endif
1044 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
1045 {
1046 .procname = "ignore-unaligned-usertrap",
1047 .data = &no_unaligned_warning,
1048 .maxlen = sizeof (int),
1049 .mode = 0644,
1050 .proc_handler = proc_dointvec,
1051 },
1052 #endif
1053 #ifdef CONFIG_IA64
1054 {
1055 .procname = "unaligned-dump-stack",
1056 .data = &unaligned_dump_stack,
1057 .maxlen = sizeof (int),
1058 .mode = 0644,
1059 .proc_handler = proc_dointvec,
1060 },
1061 #endif
1062 #ifdef CONFIG_DETECT_HUNG_TASK
1063 {
1064 .procname = "hung_task_panic",
1065 .data = &sysctl_hung_task_panic,
1066 .maxlen = sizeof(int),
1067 .mode = 0644,
1068 .proc_handler = proc_dointvec_minmax,
1069 .extra1 = &zero,
1070 .extra2 = &one,
1071 },
1072 {
1073 .procname = "hung_task_check_count",
1074 .data = &sysctl_hung_task_check_count,
1075 .maxlen = sizeof(int),
1076 .mode = 0644,
1077 .proc_handler = proc_dointvec_minmax,
1078 .extra1 = &zero,
1079 },
1080 {
1081 .procname = "hung_task_timeout_secs",
1082 .data = &sysctl_hung_task_timeout_secs,
1083 .maxlen = sizeof(unsigned long),
1084 .mode = 0644,
1085 .proc_handler = proc_dohung_task_timeout_secs,
1086 .extra2 = &hung_task_timeout_max,
1087 },
1088 {
1089 .procname = "hung_task_warnings",
1090 .data = &sysctl_hung_task_warnings,
1091 .maxlen = sizeof(int),
1092 .mode = 0644,
1093 .proc_handler = proc_dointvec_minmax,
1094 .extra1 = &neg_one,
1095 },
1096 #endif
1097 #ifdef CONFIG_RT_MUTEXES
1098 {
1099 .procname = "max_lock_depth",
1100 .data = &max_lock_depth,
1101 .maxlen = sizeof(int),
1102 .mode = 0644,
1103 .proc_handler = proc_dointvec,
1104 },
1105 #endif
1106 {
1107 .procname = "poweroff_cmd",
1108 .data = &poweroff_cmd,
1109 .maxlen = POWEROFF_CMD_PATH_LEN,
1110 .mode = 0644,
1111 .proc_handler = proc_dostring,
1112 },
1113 #ifdef CONFIG_KEYS
1114 {
1115 .procname = "keys",
1116 .mode = 0555,
1117 .child = key_sysctls,
1118 },
1119 #endif
1120 #ifdef CONFIG_PERF_EVENTS
1121 /*
1122 * User-space scripts rely on the existence of this file
1123 * as a feature check for perf_events being enabled.
1124 *
1125 * So it's an ABI, do not remove!
1126 */
1127 {
1128 .procname = "perf_event_paranoid",
1129 .data = &sysctl_perf_event_paranoid,
1130 .maxlen = sizeof(sysctl_perf_event_paranoid),
1131 .mode = 0644,
1132 .proc_handler = proc_dointvec,
1133 },
1134 {
1135 .procname = "perf_event_mlock_kb",
1136 .data = &sysctl_perf_event_mlock,
1137 .maxlen = sizeof(sysctl_perf_event_mlock),
1138 .mode = 0644,
1139 .proc_handler = proc_dointvec,
1140 },
1141 {
1142 .procname = "perf_event_max_sample_rate",
1143 .data = &sysctl_perf_event_sample_rate,
1144 .maxlen = sizeof(sysctl_perf_event_sample_rate),
1145 .mode = 0644,
1146 .proc_handler = perf_proc_update_handler,
1147 .extra1 = &one,
1148 },
1149 {
1150 .procname = "perf_cpu_time_max_percent",
1151 .data = &sysctl_perf_cpu_time_max_percent,
1152 .maxlen = sizeof(sysctl_perf_cpu_time_max_percent),
1153 .mode = 0644,
1154 .proc_handler = perf_cpu_time_max_percent_handler,
1155 .extra1 = &zero,
1156 .extra2 = &one_hundred,
1157 },
1158 {
1159 .procname = "perf_event_max_stack",
1160 .data = &sysctl_perf_event_max_stack,
1161 .maxlen = sizeof(sysctl_perf_event_max_stack),
1162 .mode = 0644,
1163 .proc_handler = perf_event_max_stack_handler,
1164 .extra1 = &zero,
1165 .extra2 = &six_hundred_forty_kb,
1166 },
1167 {
1168 .procname = "perf_event_max_contexts_per_stack",
1169 .data = &sysctl_perf_event_max_contexts_per_stack,
1170 .maxlen = sizeof(sysctl_perf_event_max_contexts_per_stack),
1171 .mode = 0644,
1172 .proc_handler = perf_event_max_stack_handler,
1173 .extra1 = &zero,
1174 .extra2 = &one_thousand,
1175 },
1176 #endif
1177 #ifdef CONFIG_KMEMCHECK
1178 {
1179 .procname = "kmemcheck",
1180 .data = &kmemcheck_enabled,
1181 .maxlen = sizeof(int),
1182 .mode = 0644,
1183 .proc_handler = proc_dointvec,
1184 },
1185 #endif
1186 {
1187 .procname = "panic_on_warn",
1188 .data = &panic_on_warn,
1189 .maxlen = sizeof(int),
1190 .mode = 0644,
1191 .proc_handler = proc_dointvec_minmax,
1192 .extra1 = &zero,
1193 .extra2 = &one,
1194 },
1195 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON)
1196 {
1197 .procname = "timer_migration",
1198 .data = &sysctl_timer_migration,
1199 .maxlen = sizeof(unsigned int),
1200 .mode = 0644,
1201 .proc_handler = timer_migration_handler,
1202 .extra1 = &zero,
1203 .extra2 = &one,
1204 },
1205 #endif
1206 #ifdef CONFIG_BPF_SYSCALL
1207 {
1208 .procname = "unprivileged_bpf_disabled",
1209 .data = &sysctl_unprivileged_bpf_disabled,
1210 .maxlen = sizeof(sysctl_unprivileged_bpf_disabled),
1211 .mode = 0644,
1212 /* only handle a transition from default "0" to "1" */
1213 .proc_handler = proc_dointvec_minmax,
1214 .extra1 = &one,
1215 .extra2 = &one,
1216 },
1217 #endif
1218 #if defined(CONFIG_TREE_RCU) || defined(CONFIG_PREEMPT_RCU)
1219 {
1220 .procname = "panic_on_rcu_stall",
1221 .data = &sysctl_panic_on_rcu_stall,
1222 .maxlen = sizeof(sysctl_panic_on_rcu_stall),
1223 .mode = 0644,
1224 .proc_handler = proc_dointvec_minmax,
1225 .extra1 = &zero,
1226 .extra2 = &one,
1227 },
1228 #endif
1229 { }
1230 };
1231
1232 static struct ctl_table vm_table[] = {
1233 {
1234 .procname = "overcommit_memory",
1235 .data = &sysctl_overcommit_memory,
1236 .maxlen = sizeof(sysctl_overcommit_memory),
1237 .mode = 0644,
1238 .proc_handler = proc_dointvec_minmax,
1239 .extra1 = &zero,
1240 .extra2 = &two,
1241 },
1242 {
1243 .procname = "panic_on_oom",
1244 .data = &sysctl_panic_on_oom,
1245 .maxlen = sizeof(sysctl_panic_on_oom),
1246 .mode = 0644,
1247 .proc_handler = proc_dointvec_minmax,
1248 .extra1 = &zero,
1249 .extra2 = &two,
1250 },
1251 {
1252 .procname = "oom_kill_allocating_task",
1253 .data = &sysctl_oom_kill_allocating_task,
1254 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
1255 .mode = 0644,
1256 .proc_handler = proc_dointvec,
1257 },
1258 {
1259 .procname = "oom_dump_tasks",
1260 .data = &sysctl_oom_dump_tasks,
1261 .maxlen = sizeof(sysctl_oom_dump_tasks),
1262 .mode = 0644,
1263 .proc_handler = proc_dointvec,
1264 },
1265 {
1266 .procname = "overcommit_ratio",
1267 .data = &sysctl_overcommit_ratio,
1268 .maxlen = sizeof(sysctl_overcommit_ratio),
1269 .mode = 0644,
1270 .proc_handler = overcommit_ratio_handler,
1271 },
1272 {
1273 .procname = "overcommit_kbytes",
1274 .data = &sysctl_overcommit_kbytes,
1275 .maxlen = sizeof(sysctl_overcommit_kbytes),
1276 .mode = 0644,
1277 .proc_handler = overcommit_kbytes_handler,
1278 },
1279 {
1280 .procname = "page-cluster",
1281 .data = &page_cluster,
1282 .maxlen = sizeof(int),
1283 .mode = 0644,
1284 .proc_handler = proc_dointvec_minmax,
1285 .extra1 = &zero,
1286 },
1287 {
1288 .procname = "dirty_background_ratio",
1289 .data = &dirty_background_ratio,
1290 .maxlen = sizeof(dirty_background_ratio),
1291 .mode = 0644,
1292 .proc_handler = dirty_background_ratio_handler,
1293 .extra1 = &zero,
1294 .extra2 = &one_hundred,
1295 },
1296 {
1297 .procname = "dirty_background_bytes",
1298 .data = &dirty_background_bytes,
1299 .maxlen = sizeof(dirty_background_bytes),
1300 .mode = 0644,
1301 .proc_handler = dirty_background_bytes_handler,
1302 .extra1 = &one_ul,
1303 },
1304 {
1305 .procname = "dirty_ratio",
1306 .data = &vm_dirty_ratio,
1307 .maxlen = sizeof(vm_dirty_ratio),
1308 .mode = 0644,
1309 .proc_handler = dirty_ratio_handler,
1310 .extra1 = &zero,
1311 .extra2 = &one_hundred,
1312 },
1313 {
1314 .procname = "dirty_bytes",
1315 .data = &vm_dirty_bytes,
1316 .maxlen = sizeof(vm_dirty_bytes),
1317 .mode = 0644,
1318 .proc_handler = dirty_bytes_handler,
1319 .extra1 = &dirty_bytes_min,
1320 },
1321 {
1322 .procname = "dirty_writeback_centisecs",
1323 .data = &dirty_writeback_interval,
1324 .maxlen = sizeof(dirty_writeback_interval),
1325 .mode = 0644,
1326 .proc_handler = dirty_writeback_centisecs_handler,
1327 },
1328 {
1329 .procname = "dirty_expire_centisecs",
1330 .data = &dirty_expire_interval,
1331 .maxlen = sizeof(dirty_expire_interval),
1332 .mode = 0644,
1333 .proc_handler = proc_dointvec_minmax,
1334 .extra1 = &zero,
1335 },
1336 {
1337 .procname = "dirtytime_expire_seconds",
1338 .data = &dirtytime_expire_interval,
1339 .maxlen = sizeof(dirty_expire_interval),
1340 .mode = 0644,
1341 .proc_handler = dirtytime_interval_handler,
1342 .extra1 = &zero,
1343 },
1344 {
1345 .procname = "nr_pdflush_threads",
1346 .mode = 0444 /* read-only */,
1347 .proc_handler = pdflush_proc_obsolete,
1348 },
1349 {
1350 .procname = "swappiness",
1351 .data = &vm_swappiness,
1352 .maxlen = sizeof(vm_swappiness),
1353 .mode = 0644,
1354 .proc_handler = proc_dointvec_minmax,
1355 .extra1 = &zero,
1356 .extra2 = &one_hundred,
1357 },
1358 #ifdef CONFIG_HUGETLB_PAGE
1359 {
1360 .procname = "nr_hugepages",
1361 .data = NULL,
1362 .maxlen = sizeof(unsigned long),
1363 .mode = 0644,
1364 .proc_handler = hugetlb_sysctl_handler,
1365 },
1366 #ifdef CONFIG_NUMA
1367 {
1368 .procname = "nr_hugepages_mempolicy",
1369 .data = NULL,
1370 .maxlen = sizeof(unsigned long),
1371 .mode = 0644,
1372 .proc_handler = &hugetlb_mempolicy_sysctl_handler,
1373 },
1374 #endif
1375 {
1376 .procname = "hugetlb_shm_group",
1377 .data = &sysctl_hugetlb_shm_group,
1378 .maxlen = sizeof(gid_t),
1379 .mode = 0644,
1380 .proc_handler = proc_dointvec,
1381 },
1382 {
1383 .procname = "hugepages_treat_as_movable",
1384 .data = &hugepages_treat_as_movable,
1385 .maxlen = sizeof(int),
1386 .mode = 0644,
1387 .proc_handler = proc_dointvec,
1388 },
1389 {
1390 .procname = "nr_overcommit_hugepages",
1391 .data = NULL,
1392 .maxlen = sizeof(unsigned long),
1393 .mode = 0644,
1394 .proc_handler = hugetlb_overcommit_handler,
1395 },
1396 #endif
1397 {
1398 .procname = "lowmem_reserve_ratio",
1399 .data = &sysctl_lowmem_reserve_ratio,
1400 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1401 .mode = 0644,
1402 .proc_handler = lowmem_reserve_ratio_sysctl_handler,
1403 },
1404 {
1405 .procname = "drop_caches",
1406 .data = &sysctl_drop_caches,
1407 .maxlen = sizeof(int),
1408 .mode = 0644,
1409 .proc_handler = drop_caches_sysctl_handler,
1410 .extra1 = &one,
1411 .extra2 = &four,
1412 },
1413 #ifdef CONFIG_COMPACTION
1414 {
1415 .procname = "compact_memory",
1416 .data = &sysctl_compact_memory,
1417 .maxlen = sizeof(int),
1418 .mode = 0200,
1419 .proc_handler = sysctl_compaction_handler,
1420 },
1421 {
1422 .procname = "extfrag_threshold",
1423 .data = &sysctl_extfrag_threshold,
1424 .maxlen = sizeof(int),
1425 .mode = 0644,
1426 .proc_handler = sysctl_extfrag_handler,
1427 .extra1 = &min_extfrag_threshold,
1428 .extra2 = &max_extfrag_threshold,
1429 },
1430 {
1431 .procname = "compact_unevictable_allowed",
1432 .data = &sysctl_compact_unevictable_allowed,
1433 .maxlen = sizeof(int),
1434 .mode = 0644,
1435 .proc_handler = proc_dointvec,
1436 .extra1 = &zero,
1437 .extra2 = &one,
1438 },
1439
1440 #endif /* CONFIG_COMPACTION */
1441 {
1442 .procname = "min_free_kbytes",
1443 .data = &min_free_kbytes,
1444 .maxlen = sizeof(min_free_kbytes),
1445 .mode = 0644,
1446 .proc_handler = min_free_kbytes_sysctl_handler,
1447 .extra1 = &zero,
1448 },
1449 {
1450 .procname = "watermark_scale_factor",
1451 .data = &watermark_scale_factor,
1452 .maxlen = sizeof(watermark_scale_factor),
1453 .mode = 0644,
1454 .proc_handler = watermark_scale_factor_sysctl_handler,
1455 .extra1 = &one,
1456 .extra2 = &one_thousand,
1457 },
1458 {
1459 .procname = "percpu_pagelist_fraction",
1460 .data = &percpu_pagelist_fraction,
1461 .maxlen = sizeof(percpu_pagelist_fraction),
1462 .mode = 0644,
1463 .proc_handler = percpu_pagelist_fraction_sysctl_handler,
1464 .extra1 = &zero,
1465 },
1466 #ifdef CONFIG_MMU
1467 {
1468 .procname = "max_map_count",
1469 .data = &sysctl_max_map_count,
1470 .maxlen = sizeof(sysctl_max_map_count),
1471 .mode = 0644,
1472 .proc_handler = proc_dointvec_minmax,
1473 .extra1 = &zero,
1474 },
1475 #else
1476 {
1477 .procname = "nr_trim_pages",
1478 .data = &sysctl_nr_trim_pages,
1479 .maxlen = sizeof(sysctl_nr_trim_pages),
1480 .mode = 0644,
1481 .proc_handler = proc_dointvec_minmax,
1482 .extra1 = &zero,
1483 },
1484 #endif
1485 {
1486 .procname = "laptop_mode",
1487 .data = &laptop_mode,
1488 .maxlen = sizeof(laptop_mode),
1489 .mode = 0644,
1490 .proc_handler = proc_dointvec_jiffies,
1491 },
1492 {
1493 .procname = "block_dump",
1494 .data = &block_dump,
1495 .maxlen = sizeof(block_dump),
1496 .mode = 0644,
1497 .proc_handler = proc_dointvec,
1498 .extra1 = &zero,
1499 },
1500 {
1501 .procname = "vfs_cache_pressure",
1502 .data = &sysctl_vfs_cache_pressure,
1503 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1504 .mode = 0644,
1505 .proc_handler = proc_dointvec,
1506 .extra1 = &zero,
1507 },
1508 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1509 {
1510 .procname = "legacy_va_layout",
1511 .data = &sysctl_legacy_va_layout,
1512 .maxlen = sizeof(sysctl_legacy_va_layout),
1513 .mode = 0644,
1514 .proc_handler = proc_dointvec,
1515 .extra1 = &zero,
1516 },
1517 #endif
1518 #ifdef CONFIG_NUMA
1519 {
1520 .procname = "zone_reclaim_mode",
1521 .data = &node_reclaim_mode,
1522 .maxlen = sizeof(node_reclaim_mode),
1523 .mode = 0644,
1524 .proc_handler = proc_dointvec,
1525 .extra1 = &zero,
1526 },
1527 {
1528 .procname = "min_unmapped_ratio",
1529 .data = &sysctl_min_unmapped_ratio,
1530 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1531 .mode = 0644,
1532 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler,
1533 .extra1 = &zero,
1534 .extra2 = &one_hundred,
1535 },
1536 {
1537 .procname = "min_slab_ratio",
1538 .data = &sysctl_min_slab_ratio,
1539 .maxlen = sizeof(sysctl_min_slab_ratio),
1540 .mode = 0644,
1541 .proc_handler = sysctl_min_slab_ratio_sysctl_handler,
1542 .extra1 = &zero,
1543 .extra2 = &one_hundred,
1544 },
1545 #endif
1546 #ifdef CONFIG_SMP
1547 {
1548 .procname = "stat_interval",
1549 .data = &sysctl_stat_interval,
1550 .maxlen = sizeof(sysctl_stat_interval),
1551 .mode = 0644,
1552 .proc_handler = proc_dointvec_jiffies,
1553 },
1554 {
1555 .procname = "stat_refresh",
1556 .data = NULL,
1557 .maxlen = 0,
1558 .mode = 0600,
1559 .proc_handler = vmstat_refresh,
1560 },
1561 #endif
1562 #ifdef CONFIG_MMU
1563 {
1564 .procname = "mmap_min_addr",
1565 .data = &dac_mmap_min_addr,
1566 .maxlen = sizeof(unsigned long),
1567 .mode = 0644,
1568 .proc_handler = mmap_min_addr_handler,
1569 },
1570 #endif
1571 #ifdef CONFIG_NUMA
1572 {
1573 .procname = "numa_zonelist_order",
1574 .data = &numa_zonelist_order,
1575 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1576 .mode = 0644,
1577 .proc_handler = numa_zonelist_order_handler,
1578 },
1579 #endif
1580 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1581 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1582 {
1583 .procname = "vdso_enabled",
1584 #ifdef CONFIG_X86_32
1585 .data = &vdso32_enabled,
1586 .maxlen = sizeof(vdso32_enabled),
1587 #else
1588 .data = &vdso_enabled,
1589 .maxlen = sizeof(vdso_enabled),
1590 #endif
1591 .mode = 0644,
1592 .proc_handler = proc_dointvec,
1593 .extra1 = &zero,
1594 },
1595 #endif
1596 #ifdef CONFIG_HIGHMEM
1597 {
1598 .procname = "highmem_is_dirtyable",
1599 .data = &vm_highmem_is_dirtyable,
1600 .maxlen = sizeof(vm_highmem_is_dirtyable),
1601 .mode = 0644,
1602 .proc_handler = proc_dointvec_minmax,
1603 .extra1 = &zero,
1604 .extra2 = &one,
1605 },
1606 #endif
1607 #ifdef CONFIG_MEMORY_FAILURE
1608 {
1609 .procname = "memory_failure_early_kill",
1610 .data = &sysctl_memory_failure_early_kill,
1611 .maxlen = sizeof(sysctl_memory_failure_early_kill),
1612 .mode = 0644,
1613 .proc_handler = proc_dointvec_minmax,
1614 .extra1 = &zero,
1615 .extra2 = &one,
1616 },
1617 {
1618 .procname = "memory_failure_recovery",
1619 .data = &sysctl_memory_failure_recovery,
1620 .maxlen = sizeof(sysctl_memory_failure_recovery),
1621 .mode = 0644,
1622 .proc_handler = proc_dointvec_minmax,
1623 .extra1 = &zero,
1624 .extra2 = &one,
1625 },
1626 #endif
1627 {
1628 .procname = "user_reserve_kbytes",
1629 .data = &sysctl_user_reserve_kbytes,
1630 .maxlen = sizeof(sysctl_user_reserve_kbytes),
1631 .mode = 0644,
1632 .proc_handler = proc_doulongvec_minmax,
1633 },
1634 {
1635 .procname = "admin_reserve_kbytes",
1636 .data = &sysctl_admin_reserve_kbytes,
1637 .maxlen = sizeof(sysctl_admin_reserve_kbytes),
1638 .mode = 0644,
1639 .proc_handler = proc_doulongvec_minmax,
1640 },
1641 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS
1642 {
1643 .procname = "mmap_rnd_bits",
1644 .data = &mmap_rnd_bits,
1645 .maxlen = sizeof(mmap_rnd_bits),
1646 .mode = 0600,
1647 .proc_handler = proc_dointvec_minmax,
1648 .extra1 = (void *)&mmap_rnd_bits_min,
1649 .extra2 = (void *)&mmap_rnd_bits_max,
1650 },
1651 #endif
1652 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS
1653 {
1654 .procname = "mmap_rnd_compat_bits",
1655 .data = &mmap_rnd_compat_bits,
1656 .maxlen = sizeof(mmap_rnd_compat_bits),
1657 .mode = 0600,
1658 .proc_handler = proc_dointvec_minmax,
1659 .extra1 = (void *)&mmap_rnd_compat_bits_min,
1660 .extra2 = (void *)&mmap_rnd_compat_bits_max,
1661 },
1662 #endif
1663 { }
1664 };
1665
1666 static struct ctl_table fs_table[] = {
1667 {
1668 .procname = "inode-nr",
1669 .data = &inodes_stat,
1670 .maxlen = 2*sizeof(long),
1671 .mode = 0444,
1672 .proc_handler = proc_nr_inodes,
1673 },
1674 {
1675 .procname = "inode-state",
1676 .data = &inodes_stat,
1677 .maxlen = 7*sizeof(long),
1678 .mode = 0444,
1679 .proc_handler = proc_nr_inodes,
1680 },
1681 {
1682 .procname = "file-nr",
1683 .data = &files_stat,
1684 .maxlen = sizeof(files_stat),
1685 .mode = 0444,
1686 .proc_handler = proc_nr_files,
1687 },
1688 {
1689 .procname = "file-max",
1690 .data = &files_stat.max_files,
1691 .maxlen = sizeof(files_stat.max_files),
1692 .mode = 0644,
1693 .proc_handler = proc_doulongvec_minmax,
1694 },
1695 {
1696 .procname = "nr_open",
1697 .data = &sysctl_nr_open,
1698 .maxlen = sizeof(unsigned int),
1699 .mode = 0644,
1700 .proc_handler = proc_dointvec_minmax,
1701 .extra1 = &sysctl_nr_open_min,
1702 .extra2 = &sysctl_nr_open_max,
1703 },
1704 {
1705 .procname = "dentry-state",
1706 .data = &dentry_stat,
1707 .maxlen = 6*sizeof(long),
1708 .mode = 0444,
1709 .proc_handler = proc_nr_dentry,
1710 },
1711 {
1712 .procname = "overflowuid",
1713 .data = &fs_overflowuid,
1714 .maxlen = sizeof(int),
1715 .mode = 0644,
1716 .proc_handler = proc_dointvec_minmax,
1717 .extra1 = &minolduid,
1718 .extra2 = &maxolduid,
1719 },
1720 {
1721 .procname = "overflowgid",
1722 .data = &fs_overflowgid,
1723 .maxlen = sizeof(int),
1724 .mode = 0644,
1725 .proc_handler = proc_dointvec_minmax,
1726 .extra1 = &minolduid,
1727 .extra2 = &maxolduid,
1728 },
1729 #ifdef CONFIG_FILE_LOCKING
1730 {
1731 .procname = "leases-enable",
1732 .data = &leases_enable,
1733 .maxlen = sizeof(int),
1734 .mode = 0644,
1735 .proc_handler = proc_dointvec,
1736 },
1737 #endif
1738 #ifdef CONFIG_DNOTIFY
1739 {
1740 .procname = "dir-notify-enable",
1741 .data = &dir_notify_enable,
1742 .maxlen = sizeof(int),
1743 .mode = 0644,
1744 .proc_handler = proc_dointvec,
1745 },
1746 #endif
1747 #ifdef CONFIG_MMU
1748 #ifdef CONFIG_FILE_LOCKING
1749 {
1750 .procname = "lease-break-time",
1751 .data = &lease_break_time,
1752 .maxlen = sizeof(int),
1753 .mode = 0644,
1754 .proc_handler = proc_dointvec,
1755 },
1756 #endif
1757 #ifdef CONFIG_AIO
1758 {
1759 .procname = "aio-nr",
1760 .data = &aio_nr,
1761 .maxlen = sizeof(aio_nr),
1762 .mode = 0444,
1763 .proc_handler = proc_doulongvec_minmax,
1764 },
1765 {
1766 .procname = "aio-max-nr",
1767 .data = &aio_max_nr,
1768 .maxlen = sizeof(aio_max_nr),
1769 .mode = 0644,
1770 .proc_handler = proc_doulongvec_minmax,
1771 },
1772 #endif /* CONFIG_AIO */
1773 #ifdef CONFIG_INOTIFY_USER
1774 {
1775 .procname = "inotify",
1776 .mode = 0555,
1777 .child = inotify_table,
1778 },
1779 #endif
1780 #ifdef CONFIG_EPOLL
1781 {
1782 .procname = "epoll",
1783 .mode = 0555,
1784 .child = epoll_table,
1785 },
1786 #endif
1787 #endif
1788 {
1789 .procname = "protected_symlinks",
1790 .data = &sysctl_protected_symlinks,
1791 .maxlen = sizeof(int),
1792 .mode = 0600,
1793 .proc_handler = proc_dointvec_minmax,
1794 .extra1 = &zero,
1795 .extra2 = &one,
1796 },
1797 {
1798 .procname = "protected_hardlinks",
1799 .data = &sysctl_protected_hardlinks,
1800 .maxlen = sizeof(int),
1801 .mode = 0600,
1802 .proc_handler = proc_dointvec_minmax,
1803 .extra1 = &zero,
1804 .extra2 = &one,
1805 },
1806 {
1807 .procname = "suid_dumpable",
1808 .data = &suid_dumpable,
1809 .maxlen = sizeof(int),
1810 .mode = 0644,
1811 .proc_handler = proc_dointvec_minmax_coredump,
1812 .extra1 = &zero,
1813 .extra2 = &two,
1814 },
1815 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1816 {
1817 .procname = "binfmt_misc",
1818 .mode = 0555,
1819 .child = sysctl_mount_point,
1820 },
1821 #endif
1822 {
1823 .procname = "pipe-max-size",
1824 .data = &pipe_max_size,
1825 .maxlen = sizeof(int),
1826 .mode = 0644,
1827 .proc_handler = &pipe_proc_fn,
1828 .extra1 = &pipe_min_size,
1829 },
1830 {
1831 .procname = "pipe-user-pages-hard",
1832 .data = &pipe_user_pages_hard,
1833 .maxlen = sizeof(pipe_user_pages_hard),
1834 .mode = 0644,
1835 .proc_handler = proc_doulongvec_minmax,
1836 },
1837 {
1838 .procname = "pipe-user-pages-soft",
1839 .data = &pipe_user_pages_soft,
1840 .maxlen = sizeof(pipe_user_pages_soft),
1841 .mode = 0644,
1842 .proc_handler = proc_doulongvec_minmax,
1843 },
1844 {
1845 .procname = "mount-max",
1846 .data = &sysctl_mount_max,
1847 .maxlen = sizeof(unsigned int),
1848 .mode = 0644,
1849 .proc_handler = proc_dointvec_minmax,
1850 .extra1 = &one,
1851 },
1852 { }
1853 };
1854
1855 static struct ctl_table debug_table[] = {
1856 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
1857 {
1858 .procname = "exception-trace",
1859 .data = &show_unhandled_signals,
1860 .maxlen = sizeof(int),
1861 .mode = 0644,
1862 .proc_handler = proc_dointvec
1863 },
1864 #endif
1865 #if defined(CONFIG_OPTPROBES)
1866 {
1867 .procname = "kprobes-optimization",
1868 .data = &sysctl_kprobes_optimization,
1869 .maxlen = sizeof(int),
1870 .mode = 0644,
1871 .proc_handler = proc_kprobes_optimization_handler,
1872 .extra1 = &zero,
1873 .extra2 = &one,
1874 },
1875 #endif
1876 { }
1877 };
1878
1879 static struct ctl_table dev_table[] = {
1880 { }
1881 };
1882
1883 int __init sysctl_init(void)
1884 {
1885 struct ctl_table_header *hdr;
1886
1887 hdr = register_sysctl_table(sysctl_base_table);
1888 kmemleak_not_leak(hdr);
1889 return 0;
1890 }
1891
1892 #endif /* CONFIG_SYSCTL */
1893
1894 /*
1895 * /proc/sys support
1896 */
1897
1898 #ifdef CONFIG_PROC_SYSCTL
1899
1900 static int _proc_do_string(char *data, int maxlen, int write,
1901 char __user *buffer,
1902 size_t *lenp, loff_t *ppos)
1903 {
1904 size_t len;
1905 char __user *p;
1906 char c;
1907
1908 if (!data || !maxlen || !*lenp) {
1909 *lenp = 0;
1910 return 0;
1911 }
1912
1913 if (write) {
1914 if (sysctl_writes_strict == SYSCTL_WRITES_STRICT) {
1915 /* Only continue writes not past the end of buffer. */
1916 len = strlen(data);
1917 if (len > maxlen - 1)
1918 len = maxlen - 1;
1919
1920 if (*ppos > len)
1921 return 0;
1922 len = *ppos;
1923 } else {
1924 /* Start writing from beginning of buffer. */
1925 len = 0;
1926 }
1927
1928 *ppos += *lenp;
1929 p = buffer;
1930 while ((p - buffer) < *lenp && len < maxlen - 1) {
1931 if (get_user(c, p++))
1932 return -EFAULT;
1933 if (c == 0 || c == '\n')
1934 break;
1935 data[len++] = c;
1936 }
1937 data[len] = 0;
1938 } else {
1939 len = strlen(data);
1940 if (len > maxlen)
1941 len = maxlen;
1942
1943 if (*ppos > len) {
1944 *lenp = 0;
1945 return 0;
1946 }
1947
1948 data += *ppos;
1949 len -= *ppos;
1950
1951 if (len > *lenp)
1952 len = *lenp;
1953 if (len)
1954 if (copy_to_user(buffer, data, len))
1955 return -EFAULT;
1956 if (len < *lenp) {
1957 if (put_user('\n', buffer + len))
1958 return -EFAULT;
1959 len++;
1960 }
1961 *lenp = len;
1962 *ppos += len;
1963 }
1964 return 0;
1965 }
1966
1967 static void warn_sysctl_write(struct ctl_table *table)
1968 {
1969 pr_warn_once("%s wrote to %s when file position was not 0!\n"
1970 "This will not be supported in the future. To silence this\n"
1971 "warning, set kernel.sysctl_writes_strict = -1\n",
1972 current->comm, table->procname);
1973 }
1974
1975 /**
1976 * proc_first_pos_non_zero_ignore - check if firs position is allowed
1977 * @ppos: file position
1978 * @table: the sysctl table
1979 *
1980 * Returns true if the first position is non-zero and the sysctl_writes_strict
1981 * mode indicates this is not allowed for numeric input types. String proc
1982 * hadlers can ignore the return value.
1983 */
1984 static bool proc_first_pos_non_zero_ignore(loff_t *ppos,
1985 struct ctl_table *table)
1986 {
1987 if (!*ppos)
1988 return false;
1989
1990 switch (sysctl_writes_strict) {
1991 case SYSCTL_WRITES_STRICT:
1992 return true;
1993 case SYSCTL_WRITES_WARN:
1994 warn_sysctl_write(table);
1995 return false;
1996 default:
1997 return false;
1998 }
1999 }
2000
2001 /**
2002 * proc_dostring - read a string sysctl
2003 * @table: the sysctl table
2004 * @write: %TRUE if this is a write to the sysctl file
2005 * @buffer: the user buffer
2006 * @lenp: the size of the user buffer
2007 * @ppos: file position
2008 *
2009 * Reads/writes a string from/to the user buffer. If the kernel
2010 * buffer provided is not large enough to hold the string, the
2011 * string is truncated. The copied string is %NULL-terminated.
2012 * If the string is being read by the user process, it is copied
2013 * and a newline '\n' is added. It is truncated if the buffer is
2014 * not large enough.
2015 *
2016 * Returns 0 on success.
2017 */
2018 int proc_dostring(struct ctl_table *table, int write,
2019 void __user *buffer, size_t *lenp, loff_t *ppos)
2020 {
2021 if (write)
2022 proc_first_pos_non_zero_ignore(ppos, table);
2023
2024 return _proc_do_string((char *)(table->data), table->maxlen, write,
2025 (char __user *)buffer, lenp, ppos);
2026 }
2027
2028 static size_t proc_skip_spaces(char **buf)
2029 {
2030 size_t ret;
2031 char *tmp = skip_spaces(*buf);
2032 ret = tmp - *buf;
2033 *buf = tmp;
2034 return ret;
2035 }
2036
2037 static void proc_skip_char(char **buf, size_t *size, const char v)
2038 {
2039 while (*size) {
2040 if (**buf != v)
2041 break;
2042 (*size)--;
2043 (*buf)++;
2044 }
2045 }
2046
2047 #define TMPBUFLEN 22
2048 /**
2049 * proc_get_long - reads an ASCII formatted integer from a user buffer
2050 *
2051 * @buf: a kernel buffer
2052 * @size: size of the kernel buffer
2053 * @val: this is where the number will be stored
2054 * @neg: set to %TRUE if number is negative
2055 * @perm_tr: a vector which contains the allowed trailers
2056 * @perm_tr_len: size of the perm_tr vector
2057 * @tr: pointer to store the trailer character
2058 *
2059 * In case of success %0 is returned and @buf and @size are updated with
2060 * the amount of bytes read. If @tr is non-NULL and a trailing
2061 * character exists (size is non-zero after returning from this
2062 * function), @tr is updated with the trailing character.
2063 */
2064 static int proc_get_long(char **buf, size_t *size,
2065 unsigned long *val, bool *neg,
2066 const char *perm_tr, unsigned perm_tr_len, char *tr)
2067 {
2068 int len;
2069 char *p, tmp[TMPBUFLEN];
2070
2071 if (!*size)
2072 return -EINVAL;
2073
2074 len = *size;
2075 if (len > TMPBUFLEN - 1)
2076 len = TMPBUFLEN - 1;
2077
2078 memcpy(tmp, *buf, len);
2079
2080 tmp[len] = 0;
2081 p = tmp;
2082 if (*p == '-' && *size > 1) {
2083 *neg = true;
2084 p++;
2085 } else
2086 *neg = false;
2087 if (!isdigit(*p))
2088 return -EINVAL;
2089
2090 *val = simple_strtoul(p, &p, 0);
2091
2092 len = p - tmp;
2093
2094 /* We don't know if the next char is whitespace thus we may accept
2095 * invalid integers (e.g. 1234...a) or two integers instead of one
2096 * (e.g. 123...1). So lets not allow such large numbers. */
2097 if (len == TMPBUFLEN - 1)
2098 return -EINVAL;
2099
2100 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
2101 return -EINVAL;
2102
2103 if (tr && (len < *size))
2104 *tr = *p;
2105
2106 *buf += len;
2107 *size -= len;
2108
2109 return 0;
2110 }
2111
2112 /**
2113 * proc_put_long - converts an integer to a decimal ASCII formatted string
2114 *
2115 * @buf: the user buffer
2116 * @size: the size of the user buffer
2117 * @val: the integer to be converted
2118 * @neg: sign of the number, %TRUE for negative
2119 *
2120 * In case of success %0 is returned and @buf and @size are updated with
2121 * the amount of bytes written.
2122 */
2123 static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
2124 bool neg)
2125 {
2126 int len;
2127 char tmp[TMPBUFLEN], *p = tmp;
2128
2129 sprintf(p, "%s%lu", neg ? "-" : "", val);
2130 len = strlen(tmp);
2131 if (len > *size)
2132 len = *size;
2133 if (copy_to_user(*buf, tmp, len))
2134 return -EFAULT;
2135 *size -= len;
2136 *buf += len;
2137 return 0;
2138 }
2139 #undef TMPBUFLEN
2140
2141 static int proc_put_char(void __user **buf, size_t *size, char c)
2142 {
2143 if (*size) {
2144 char __user **buffer = (char __user **)buf;
2145 if (put_user(c, *buffer))
2146 return -EFAULT;
2147 (*size)--, (*buffer)++;
2148 *buf = *buffer;
2149 }
2150 return 0;
2151 }
2152
2153 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
2154 int *valp,
2155 int write, void *data)
2156 {
2157 if (write) {
2158 if (*negp) {
2159 if (*lvalp > (unsigned long) INT_MAX + 1)
2160 return -EINVAL;
2161 *valp = -*lvalp;
2162 } else {
2163 if (*lvalp > (unsigned long) INT_MAX)
2164 return -EINVAL;
2165 *valp = *lvalp;
2166 }
2167 } else {
2168 int val = *valp;
2169 if (val < 0) {
2170 *negp = true;
2171 *lvalp = -(unsigned long)val;
2172 } else {
2173 *negp = false;
2174 *lvalp = (unsigned long)val;
2175 }
2176 }
2177 return 0;
2178 }
2179
2180 static int do_proc_douintvec_conv(unsigned long *lvalp,
2181 unsigned int *valp,
2182 int write, void *data)
2183 {
2184 if (write) {
2185 if (*lvalp > UINT_MAX)
2186 return -EINVAL;
2187 *valp = *lvalp;
2188 } else {
2189 unsigned int val = *valp;
2190 *lvalp = (unsigned long)val;
2191 }
2192 return 0;
2193 }
2194
2195 static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
2196
2197 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
2198 int write, void __user *buffer,
2199 size_t *lenp, loff_t *ppos,
2200 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2201 int write, void *data),
2202 void *data)
2203 {
2204 int *i, vleft, first = 1, err = 0;
2205 size_t left;
2206 char *kbuf = NULL, *p;
2207
2208 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
2209 *lenp = 0;
2210 return 0;
2211 }
2212
2213 i = (int *) tbl_data;
2214 vleft = table->maxlen / sizeof(*i);
2215 left = *lenp;
2216
2217 if (!conv)
2218 conv = do_proc_dointvec_conv;
2219
2220 if (write) {
2221 if (proc_first_pos_non_zero_ignore(ppos, table))
2222 goto out;
2223
2224 if (left > PAGE_SIZE - 1)
2225 left = PAGE_SIZE - 1;
2226 p = kbuf = memdup_user_nul(buffer, left);
2227 if (IS_ERR(kbuf))
2228 return PTR_ERR(kbuf);
2229 }
2230
2231 for (; left && vleft--; i++, first=0) {
2232 unsigned long lval;
2233 bool neg;
2234
2235 if (write) {
2236 left -= proc_skip_spaces(&p);
2237
2238 if (!left)
2239 break;
2240 err = proc_get_long(&p, &left, &lval, &neg,
2241 proc_wspace_sep,
2242 sizeof(proc_wspace_sep), NULL);
2243 if (err)
2244 break;
2245 if (conv(&neg, &lval, i, 1, data)) {
2246 err = -EINVAL;
2247 break;
2248 }
2249 } else {
2250 if (conv(&neg, &lval, i, 0, data)) {
2251 err = -EINVAL;
2252 break;
2253 }
2254 if (!first)
2255 err = proc_put_char(&buffer, &left, '\t');
2256 if (err)
2257 break;
2258 err = proc_put_long(&buffer, &left, lval, neg);
2259 if (err)
2260 break;
2261 }
2262 }
2263
2264 if (!write && !first && left && !err)
2265 err = proc_put_char(&buffer, &left, '\n');
2266 if (write && !err && left)
2267 left -= proc_skip_spaces(&p);
2268 if (write) {
2269 kfree(kbuf);
2270 if (first)
2271 return err ? : -EINVAL;
2272 }
2273 *lenp -= left;
2274 out:
2275 *ppos += *lenp;
2276 return err;
2277 }
2278
2279 static int do_proc_dointvec(struct ctl_table *table, int write,
2280 void __user *buffer, size_t *lenp, loff_t *ppos,
2281 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2282 int write, void *data),
2283 void *data)
2284 {
2285 return __do_proc_dointvec(table->data, table, write,
2286 buffer, lenp, ppos, conv, data);
2287 }
2288
2289 static int do_proc_douintvec_w(unsigned int *tbl_data,
2290 struct ctl_table *table,
2291 void __user *buffer,
2292 size_t *lenp, loff_t *ppos,
2293 int (*conv)(unsigned long *lvalp,
2294 unsigned int *valp,
2295 int write, void *data),
2296 void *data)
2297 {
2298 unsigned long lval;
2299 int err = 0;
2300 size_t left;
2301 bool neg;
2302 char *kbuf = NULL, *p;
2303
2304 left = *lenp;
2305
2306 if (proc_first_pos_non_zero_ignore(ppos, table))
2307 goto bail_early;
2308
2309 if (left > PAGE_SIZE - 1)
2310 left = PAGE_SIZE - 1;
2311
2312 p = kbuf = memdup_user_nul(buffer, left);
2313 if (IS_ERR(kbuf))
2314 return -EINVAL;
2315
2316 left -= proc_skip_spaces(&p);
2317 if (!left) {
2318 err = -EINVAL;
2319 goto out_free;
2320 }
2321
2322 err = proc_get_long(&p, &left, &lval, &neg,
2323 proc_wspace_sep,
2324 sizeof(proc_wspace_sep), NULL);
2325 if (err || neg) {
2326 err = -EINVAL;
2327 goto out_free;
2328 }
2329
2330 if (conv(&lval, tbl_data, 1, data)) {
2331 err = -EINVAL;
2332 goto out_free;
2333 }
2334
2335 if (!err && left)
2336 left -= proc_skip_spaces(&p);
2337
2338 out_free:
2339 kfree(kbuf);
2340 if (err)
2341 return -EINVAL;
2342
2343 return 0;
2344
2345 /* This is in keeping with old __do_proc_dointvec() */
2346 bail_early:
2347 *ppos += *lenp;
2348 return err;
2349 }
2350
2351 static int do_proc_douintvec_r(unsigned int *tbl_data, void __user *buffer,
2352 size_t *lenp, loff_t *ppos,
2353 int (*conv)(unsigned long *lvalp,
2354 unsigned int *valp,
2355 int write, void *data),
2356 void *data)
2357 {
2358 unsigned long lval;
2359 int err = 0;
2360 size_t left;
2361
2362 left = *lenp;
2363
2364 if (conv(&lval, tbl_data, 0, data)) {
2365 err = -EINVAL;
2366 goto out;
2367 }
2368
2369 err = proc_put_long(&buffer, &left, lval, false);
2370 if (err || !left)
2371 goto out;
2372
2373 err = proc_put_char(&buffer, &left, '\n');
2374
2375 out:
2376 *lenp -= left;
2377 *ppos += *lenp;
2378
2379 return err;
2380 }
2381
2382 static int __do_proc_douintvec(void *tbl_data, struct ctl_table *table,
2383 int write, void __user *buffer,
2384 size_t *lenp, loff_t *ppos,
2385 int (*conv)(unsigned long *lvalp,
2386 unsigned int *valp,
2387 int write, void *data),
2388 void *data)
2389 {
2390 unsigned int *i, vleft;
2391
2392 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
2393 *lenp = 0;
2394 return 0;
2395 }
2396
2397 i = (unsigned int *) tbl_data;
2398 vleft = table->maxlen / sizeof(*i);
2399
2400 /*
2401 * Arrays are not supported, keep this simple. *Do not* add
2402 * support for them.
2403 */
2404 if (vleft != 1) {
2405 *lenp = 0;
2406 return -EINVAL;
2407 }
2408
2409 if (!conv)
2410 conv = do_proc_douintvec_conv;
2411
2412 if (write)
2413 return do_proc_douintvec_w(i, table, buffer, lenp, ppos,
2414 conv, data);
2415 return do_proc_douintvec_r(i, buffer, lenp, ppos, conv, data);
2416 }
2417
2418 static int do_proc_douintvec(struct ctl_table *table, int write,
2419 void __user *buffer, size_t *lenp, loff_t *ppos,
2420 int (*conv)(unsigned long *lvalp,
2421 unsigned int *valp,
2422 int write, void *data),
2423 void *data)
2424 {
2425 return __do_proc_douintvec(table->data, table, write,
2426 buffer, lenp, ppos, conv, data);
2427 }
2428
2429 /**
2430 * proc_dointvec - read a vector of integers
2431 * @table: the sysctl table
2432 * @write: %TRUE if this is a write to the sysctl file
2433 * @buffer: the user buffer
2434 * @lenp: the size of the user buffer
2435 * @ppos: file position
2436 *
2437 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2438 * values from/to the user buffer, treated as an ASCII string.
2439 *
2440 * Returns 0 on success.
2441 */
2442 int proc_dointvec(struct ctl_table *table, int write,
2443 void __user *buffer, size_t *lenp, loff_t *ppos)
2444 {
2445 return do_proc_dointvec(table, write, buffer, lenp, ppos, NULL, NULL);
2446 }
2447
2448 /**
2449 * proc_douintvec - read a vector of unsigned integers
2450 * @table: the sysctl table
2451 * @write: %TRUE if this is a write to the sysctl file
2452 * @buffer: the user buffer
2453 * @lenp: the size of the user buffer
2454 * @ppos: file position
2455 *
2456 * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
2457 * values from/to the user buffer, treated as an ASCII string.
2458 *
2459 * Returns 0 on success.
2460 */
2461 int proc_douintvec(struct ctl_table *table, int write,
2462 void __user *buffer, size_t *lenp, loff_t *ppos)
2463 {
2464 return do_proc_douintvec(table, write, buffer, lenp, ppos,
2465 do_proc_douintvec_conv, NULL);
2466 }
2467
2468 /*
2469 * Taint values can only be increased
2470 * This means we can safely use a temporary.
2471 */
2472 static int proc_taint(struct ctl_table *table, int write,
2473 void __user *buffer, size_t *lenp, loff_t *ppos)
2474 {
2475 struct ctl_table t;
2476 unsigned long tmptaint = get_taint();
2477 int err;
2478
2479 if (write && !capable(CAP_SYS_ADMIN))
2480 return -EPERM;
2481
2482 t = *table;
2483 t.data = &tmptaint;
2484 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
2485 if (err < 0)
2486 return err;
2487
2488 if (write) {
2489 /*
2490 * Poor man's atomic or. Not worth adding a primitive
2491 * to everyone's atomic.h for this
2492 */
2493 int i;
2494 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2495 if ((tmptaint >> i) & 1)
2496 add_taint(i, LOCKDEP_STILL_OK);
2497 }
2498 }
2499
2500 return err;
2501 }
2502
2503 #ifdef CONFIG_PRINTK
2504 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
2505 void __user *buffer, size_t *lenp, loff_t *ppos)
2506 {
2507 if (write && !capable(CAP_SYS_ADMIN))
2508 return -EPERM;
2509
2510 return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2511 }
2512 #endif
2513
2514 struct do_proc_dointvec_minmax_conv_param {
2515 int *min;
2516 int *max;
2517 };
2518
2519 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
2520 int *valp,
2521 int write, void *data)
2522 {
2523 struct do_proc_dointvec_minmax_conv_param *param = data;
2524 if (write) {
2525 int val = *negp ? -*lvalp : *lvalp;
2526 if ((param->min && *param->min > val) ||
2527 (param->max && *param->max < val))
2528 return -EINVAL;
2529 *valp = val;
2530 } else {
2531 int val = *valp;
2532 if (val < 0) {
2533 *negp = true;
2534 *lvalp = -(unsigned long)val;
2535 } else {
2536 *negp = false;
2537 *lvalp = (unsigned long)val;
2538 }
2539 }
2540 return 0;
2541 }
2542
2543 /**
2544 * proc_dointvec_minmax - read a vector of integers with min/max values
2545 * @table: the sysctl table
2546 * @write: %TRUE if this is a write to the sysctl file
2547 * @buffer: the user buffer
2548 * @lenp: the size of the user buffer
2549 * @ppos: file position
2550 *
2551 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2552 * values from/to the user buffer, treated as an ASCII string.
2553 *
2554 * This routine will ensure the values are within the range specified by
2555 * table->extra1 (min) and table->extra2 (max).
2556 *
2557 * Returns 0 on success.
2558 */
2559 int proc_dointvec_minmax(struct ctl_table *table, int write,
2560 void __user *buffer, size_t *lenp, loff_t *ppos)
2561 {
2562 struct do_proc_dointvec_minmax_conv_param param = {
2563 .min = (int *) table->extra1,
2564 .max = (int *) table->extra2,
2565 };
2566 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2567 do_proc_dointvec_minmax_conv, &param);
2568 }
2569
2570 struct do_proc_douintvec_minmax_conv_param {
2571 unsigned int *min;
2572 unsigned int *max;
2573 };
2574
2575 static int do_proc_douintvec_minmax_conv(unsigned long *lvalp,
2576 unsigned int *valp,
2577 int write, void *data)
2578 {
2579 struct do_proc_douintvec_minmax_conv_param *param = data;
2580
2581 if (write) {
2582 unsigned int val = *lvalp;
2583
2584 if ((param->min && *param->min > val) ||
2585 (param->max && *param->max < val))
2586 return -ERANGE;
2587
2588 if (*lvalp > UINT_MAX)
2589 return -EINVAL;
2590 *valp = val;
2591 } else {
2592 unsigned int val = *valp;
2593 *lvalp = (unsigned long) val;
2594 }
2595
2596 return 0;
2597 }
2598
2599 /**
2600 * proc_douintvec_minmax - read a vector of unsigned ints with min/max values
2601 * @table: the sysctl table
2602 * @write: %TRUE if this is a write to the sysctl file
2603 * @buffer: the user buffer
2604 * @lenp: the size of the user buffer
2605 * @ppos: file position
2606 *
2607 * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
2608 * values from/to the user buffer, treated as an ASCII string. Negative
2609 * strings are not allowed.
2610 *
2611 * This routine will ensure the values are within the range specified by
2612 * table->extra1 (min) and table->extra2 (max). There is a final sanity
2613 * check for UINT_MAX to avoid having to support wrap around uses from
2614 * userspace.
2615 *
2616 * Returns 0 on success.
2617 */
2618 int proc_douintvec_minmax(struct ctl_table *table, int write,
2619 void __user *buffer, size_t *lenp, loff_t *ppos)
2620 {
2621 struct do_proc_douintvec_minmax_conv_param param = {
2622 .min = (unsigned int *) table->extra1,
2623 .max = (unsigned int *) table->extra2,
2624 };
2625 return do_proc_douintvec(table, write, buffer, lenp, ppos,
2626 do_proc_douintvec_minmax_conv, &param);
2627 }
2628
2629 static void validate_coredump_safety(void)
2630 {
2631 #ifdef CONFIG_COREDUMP
2632 if (suid_dumpable == SUID_DUMP_ROOT &&
2633 core_pattern[0] != '/' && core_pattern[0] != '|') {
2634 printk(KERN_WARNING
2635 "Unsafe core_pattern used with fs.suid_dumpable=2.\n"
2636 "Pipe handler or fully qualified core dump path required.\n"
2637 "Set kernel.core_pattern before fs.suid_dumpable.\n"
2638 );
2639 }
2640 #endif
2641 }
2642
2643 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
2644 void __user *buffer, size_t *lenp, loff_t *ppos)
2645 {
2646 int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2647 if (!error)
2648 validate_coredump_safety();
2649 return error;
2650 }
2651
2652 #ifdef CONFIG_COREDUMP
2653 static int proc_dostring_coredump(struct ctl_table *table, int write,
2654 void __user *buffer, size_t *lenp, loff_t *ppos)
2655 {
2656 int error = proc_dostring(table, write, buffer, lenp, ppos);
2657 if (!error)
2658 validate_coredump_safety();
2659 return error;
2660 }
2661 #endif
2662
2663 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2664 void __user *buffer,
2665 size_t *lenp, loff_t *ppos,
2666 unsigned long convmul,
2667 unsigned long convdiv)
2668 {
2669 unsigned long *i, *min, *max;
2670 int vleft, first = 1, err = 0;
2671 size_t left;
2672 char *kbuf = NULL, *p;
2673
2674 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
2675 *lenp = 0;
2676 return 0;
2677 }
2678
2679 i = (unsigned long *) data;
2680 min = (unsigned long *) table->extra1;
2681 max = (unsigned long *) table->extra2;
2682 vleft = table->maxlen / sizeof(unsigned long);
2683 left = *lenp;
2684
2685 if (write) {
2686 if (proc_first_pos_non_zero_ignore(ppos, table))
2687 goto out;
2688
2689 if (left > PAGE_SIZE - 1)
2690 left = PAGE_SIZE - 1;
2691 p = kbuf = memdup_user_nul(buffer, left);
2692 if (IS_ERR(kbuf))
2693 return PTR_ERR(kbuf);
2694 }
2695
2696 for (; left && vleft--; i++, first = 0) {
2697 unsigned long val;
2698
2699 if (write) {
2700 bool neg;
2701
2702 left -= proc_skip_spaces(&p);
2703
2704 err = proc_get_long(&p, &left, &val, &neg,
2705 proc_wspace_sep,
2706 sizeof(proc_wspace_sep), NULL);
2707 if (err)
2708 break;
2709 if (neg)
2710 continue;
2711 val = convmul * val / convdiv;
2712 if ((min && val < *min) || (max && val > *max))
2713 continue;
2714 *i = val;
2715 } else {
2716 val = convdiv * (*i) / convmul;
2717 if (!first) {
2718 err = proc_put_char(&buffer, &left, '\t');
2719 if (err)
2720 break;
2721 }
2722 err = proc_put_long(&buffer, &left, val, false);
2723 if (err)
2724 break;
2725 }
2726 }
2727
2728 if (!write && !first && left && !err)
2729 err = proc_put_char(&buffer, &left, '\n');
2730 if (write && !err)
2731 left -= proc_skip_spaces(&p);
2732 if (write) {
2733 kfree(kbuf);
2734 if (first)
2735 return err ? : -EINVAL;
2736 }
2737 *lenp -= left;
2738 out:
2739 *ppos += *lenp;
2740 return err;
2741 }
2742
2743 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2744 void __user *buffer,
2745 size_t *lenp, loff_t *ppos,
2746 unsigned long convmul,
2747 unsigned long convdiv)
2748 {
2749 return __do_proc_doulongvec_minmax(table->data, table, write,
2750 buffer, lenp, ppos, convmul, convdiv);
2751 }
2752
2753 /**
2754 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2755 * @table: the sysctl table
2756 * @write: %TRUE if this is a write to the sysctl file
2757 * @buffer: the user buffer
2758 * @lenp: the size of the user buffer
2759 * @ppos: file position
2760 *
2761 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2762 * values from/to the user buffer, treated as an ASCII string.
2763 *
2764 * This routine will ensure the values are within the range specified by
2765 * table->extra1 (min) and table->extra2 (max).
2766 *
2767 * Returns 0 on success.
2768 */
2769 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2770 void __user *buffer, size_t *lenp, loff_t *ppos)
2771 {
2772 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
2773 }
2774
2775 /**
2776 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2777 * @table: the sysctl table
2778 * @write: %TRUE if this is a write to the sysctl file
2779 * @buffer: the user buffer
2780 * @lenp: the size of the user buffer
2781 * @ppos: file position
2782 *
2783 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2784 * values from/to the user buffer, treated as an ASCII string. The values
2785 * are treated as milliseconds, and converted to jiffies when they are stored.
2786 *
2787 * This routine will ensure the values are within the range specified by
2788 * table->extra1 (min) and table->extra2 (max).
2789 *
2790 * Returns 0 on success.
2791 */
2792 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2793 void __user *buffer,
2794 size_t *lenp, loff_t *ppos)
2795 {
2796 return do_proc_doulongvec_minmax(table, write, buffer,
2797 lenp, ppos, HZ, 1000l);
2798 }
2799
2800
2801 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
2802 int *valp,
2803 int write, void *data)
2804 {
2805 if (write) {
2806 if (*lvalp > INT_MAX / HZ)
2807 return 1;
2808 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2809 } else {
2810 int val = *valp;
2811 unsigned long lval;
2812 if (val < 0) {
2813 *negp = true;
2814 lval = -(unsigned long)val;
2815 } else {
2816 *negp = false;
2817 lval = (unsigned long)val;
2818 }
2819 *lvalp = lval / HZ;
2820 }
2821 return 0;
2822 }
2823
2824 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
2825 int *valp,
2826 int write, void *data)
2827 {
2828 if (write) {
2829 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2830 return 1;
2831 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2832 } else {
2833 int val = *valp;
2834 unsigned long lval;
2835 if (val < 0) {
2836 *negp = true;
2837 lval = -(unsigned long)val;
2838 } else {
2839 *negp = false;
2840 lval = (unsigned long)val;
2841 }
2842 *lvalp = jiffies_to_clock_t(lval);
2843 }
2844 return 0;
2845 }
2846
2847 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
2848 int *valp,
2849 int write, void *data)
2850 {
2851 if (write) {
2852 unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2853
2854 if (jif > INT_MAX)
2855 return 1;
2856 *valp = (int)jif;
2857 } else {
2858 int val = *valp;
2859 unsigned long lval;
2860 if (val < 0) {
2861 *negp = true;
2862 lval = -(unsigned long)val;
2863 } else {
2864 *negp = false;
2865 lval = (unsigned long)val;
2866 }
2867 *lvalp = jiffies_to_msecs(lval);
2868 }
2869 return 0;
2870 }
2871
2872 /**
2873 * proc_dointvec_jiffies - read a vector of integers as seconds
2874 * @table: the sysctl table
2875 * @write: %TRUE if this is a write to the sysctl file
2876 * @buffer: the user buffer
2877 * @lenp: the size of the user buffer
2878 * @ppos: file position
2879 *
2880 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2881 * values from/to the user buffer, treated as an ASCII string.
2882 * The values read are assumed to be in seconds, and are converted into
2883 * jiffies.
2884 *
2885 * Returns 0 on success.
2886 */
2887 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2888 void __user *buffer, size_t *lenp, loff_t *ppos)
2889 {
2890 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2891 do_proc_dointvec_jiffies_conv,NULL);
2892 }
2893
2894 /**
2895 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2896 * @table: the sysctl table
2897 * @write: %TRUE if this is a write to the sysctl file
2898 * @buffer: the user buffer
2899 * @lenp: the size of the user buffer
2900 * @ppos: pointer to the file position
2901 *
2902 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2903 * values from/to the user buffer, treated as an ASCII string.
2904 * The values read are assumed to be in 1/USER_HZ seconds, and
2905 * are converted into jiffies.
2906 *
2907 * Returns 0 on success.
2908 */
2909 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2910 void __user *buffer, size_t *lenp, loff_t *ppos)
2911 {
2912 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2913 do_proc_dointvec_userhz_jiffies_conv,NULL);
2914 }
2915
2916 /**
2917 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2918 * @table: the sysctl table
2919 * @write: %TRUE if this is a write to the sysctl file
2920 * @buffer: the user buffer
2921 * @lenp: the size of the user buffer
2922 * @ppos: file position
2923 * @ppos: the current position in the file
2924 *
2925 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2926 * values from/to the user buffer, treated as an ASCII string.
2927 * The values read are assumed to be in 1/1000 seconds, and
2928 * are converted into jiffies.
2929 *
2930 * Returns 0 on success.
2931 */
2932 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2933 void __user *buffer, size_t *lenp, loff_t *ppos)
2934 {
2935 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2936 do_proc_dointvec_ms_jiffies_conv, NULL);
2937 }
2938
2939 static int proc_do_cad_pid(struct ctl_table *table, int write,
2940 void __user *buffer, size_t *lenp, loff_t *ppos)
2941 {
2942 struct pid *new_pid;
2943 pid_t tmp;
2944 int r;
2945
2946 tmp = pid_vnr(cad_pid);
2947
2948 r = __do_proc_dointvec(&tmp, table, write, buffer,
2949 lenp, ppos, NULL, NULL);
2950 if (r || !write)
2951 return r;
2952
2953 new_pid = find_get_pid(tmp);
2954 if (!new_pid)
2955 return -ESRCH;
2956
2957 put_pid(xchg(&cad_pid, new_pid));
2958 return 0;
2959 }
2960
2961 /**
2962 * proc_do_large_bitmap - read/write from/to a large bitmap
2963 * @table: the sysctl table
2964 * @write: %TRUE if this is a write to the sysctl file
2965 * @buffer: the user buffer
2966 * @lenp: the size of the user buffer
2967 * @ppos: file position
2968 *
2969 * The bitmap is stored at table->data and the bitmap length (in bits)
2970 * in table->maxlen.
2971 *
2972 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2973 * large bitmaps may be represented in a compact manner. Writing into
2974 * the file will clear the bitmap then update it with the given input.
2975 *
2976 * Returns 0 on success.
2977 */
2978 int proc_do_large_bitmap(struct ctl_table *table, int write,
2979 void __user *buffer, size_t *lenp, loff_t *ppos)
2980 {
2981 int err = 0;
2982 bool first = 1;
2983 size_t left = *lenp;
2984 unsigned long bitmap_len = table->maxlen;
2985 unsigned long *bitmap = *(unsigned long **) table->data;
2986 unsigned long *tmp_bitmap = NULL;
2987 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
2988
2989 if (!bitmap || !bitmap_len || !left || (*ppos && !write)) {
2990 *lenp = 0;
2991 return 0;
2992 }
2993
2994 if (write) {
2995 char *kbuf, *p;
2996
2997 if (left > PAGE_SIZE - 1)
2998 left = PAGE_SIZE - 1;
2999
3000 p = kbuf = memdup_user_nul(buffer, left);
3001 if (IS_ERR(kbuf))
3002 return PTR_ERR(kbuf);
3003
3004 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long),
3005 GFP_KERNEL);
3006 if (!tmp_bitmap) {
3007 kfree(kbuf);
3008 return -ENOMEM;
3009 }
3010 proc_skip_char(&p, &left, '\n');
3011 while (!err && left) {
3012 unsigned long val_a, val_b;
3013 bool neg;
3014
3015 err = proc_get_long(&p, &left, &val_a, &neg, tr_a,
3016 sizeof(tr_a), &c);
3017 if (err)
3018 break;
3019 if (val_a >= bitmap_len || neg) {
3020 err = -EINVAL;
3021 break;
3022 }
3023
3024 val_b = val_a;
3025 if (left) {
3026 p++;
3027 left--;
3028 }
3029
3030 if (c == '-') {
3031 err = proc_get_long(&p, &left, &val_b,
3032 &neg, tr_b, sizeof(tr_b),
3033 &c);
3034 if (err)
3035 break;
3036 if (val_b >= bitmap_len || neg ||
3037 val_a > val_b) {
3038 err = -EINVAL;
3039 break;
3040 }
3041 if (left) {
3042 p++;
3043 left--;
3044 }
3045 }
3046
3047 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
3048 first = 0;
3049 proc_skip_char(&p, &left, '\n');
3050 }
3051 kfree(kbuf);
3052 } else {
3053 unsigned long bit_a, bit_b = 0;
3054
3055 while (left) {
3056 bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
3057 if (bit_a >= bitmap_len)
3058 break;
3059 bit_b = find_next_zero_bit(bitmap, bitmap_len,
3060 bit_a + 1) - 1;
3061
3062 if (!first) {
3063 err = proc_put_char(&buffer, &left, ',');
3064 if (err)
3065 break;
3066 }
3067 err = proc_put_long(&buffer, &left, bit_a, false);
3068 if (err)
3069 break;
3070 if (bit_a != bit_b) {
3071 err = proc_put_char(&buffer, &left, '-');
3072 if (err)
3073 break;
3074 err = proc_put_long(&buffer, &left, bit_b, false);
3075 if (err)
3076 break;
3077 }
3078
3079 first = 0; bit_b++;
3080 }
3081 if (!err)
3082 err = proc_put_char(&buffer, &left, '\n');
3083 }
3084
3085 if (!err) {
3086 if (write) {
3087 if (*ppos)
3088 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
3089 else
3090 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
3091 }
3092 kfree(tmp_bitmap);
3093 *lenp -= left;
3094 *ppos += *lenp;
3095 return 0;
3096 } else {
3097 kfree(tmp_bitmap);
3098 return err;
3099 }
3100 }
3101
3102 #else /* CONFIG_PROC_SYSCTL */
3103
3104 int proc_dostring(struct ctl_table *table, int write,
3105 void __user *buffer, size_t *lenp, loff_t *ppos)
3106 {
3107 return -ENOSYS;
3108 }
3109
3110 int proc_dointvec(struct ctl_table *table, int write,
3111 void __user *buffer, size_t *lenp, loff_t *ppos)
3112 {
3113 return -ENOSYS;
3114 }
3115
3116 int proc_douintvec(struct ctl_table *table, int write,
3117 void __user *buffer, size_t *lenp, loff_t *ppos)
3118 {
3119 return -ENOSYS;
3120 }
3121
3122 int proc_dointvec_minmax(struct ctl_table *table, int write,
3123 void __user *buffer, size_t *lenp, loff_t *ppos)
3124 {
3125 return -ENOSYS;
3126 }
3127
3128 int proc_douintvec_minmax(struct ctl_table *table, int write,
3129 void __user *buffer, size_t *lenp, loff_t *ppos)
3130 {
3131 return -ENOSYS;
3132 }
3133
3134 int proc_dointvec_jiffies(struct ctl_table *table, int write,
3135 void __user *buffer, size_t *lenp, loff_t *ppos)
3136 {
3137 return -ENOSYS;
3138 }
3139
3140 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
3141 void __user *buffer, size_t *lenp, loff_t *ppos)
3142 {
3143 return -ENOSYS;
3144 }
3145
3146 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
3147 void __user *buffer, size_t *lenp, loff_t *ppos)
3148 {
3149 return -ENOSYS;
3150 }
3151
3152 int proc_doulongvec_minmax(struct ctl_table *table, int write,
3153 void __user *buffer, size_t *lenp, loff_t *ppos)
3154 {
3155 return -ENOSYS;
3156 }
3157
3158 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
3159 void __user *buffer,
3160 size_t *lenp, loff_t *ppos)
3161 {
3162 return -ENOSYS;
3163 }
3164
3165
3166 #endif /* CONFIG_PROC_SYSCTL */
3167
3168 /*
3169 * No sense putting this after each symbol definition, twice,
3170 * exception granted :-)
3171 */
3172 EXPORT_SYMBOL(proc_dointvec);
3173 EXPORT_SYMBOL(proc_douintvec);
3174 EXPORT_SYMBOL(proc_dointvec_jiffies);
3175 EXPORT_SYMBOL(proc_dointvec_minmax);
3176 EXPORT_SYMBOL_GPL(proc_douintvec_minmax);
3177 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
3178 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
3179 EXPORT_SYMBOL(proc_dostring);
3180 EXPORT_SYMBOL(proc_doulongvec_minmax);
3181 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);