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Merge branch 'acpi-ec' into acpi
[mirror_ubuntu-bionic-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/kmemleak.h>
34 #include <linux/fs.h>
35 #include <linux/init.h>
36 #include <linux/kernel.h>
37 #include <linux/kobject.h>
38 #include <linux/net.h>
39 #include <linux/sysrq.h>
40 #include <linux/highuid.h>
41 #include <linux/writeback.h>
42 #include <linux/ratelimit.h>
43 #include <linux/compaction.h>
44 #include <linux/hugetlb.h>
45 #include <linux/initrd.h>
46 #include <linux/key.h>
47 #include <linux/times.h>
48 #include <linux/limits.h>
49 #include <linux/dcache.h>
50 #include <linux/dnotify.h>
51 #include <linux/syscalls.h>
52 #include <linux/vmstat.h>
53 #include <linux/nfs_fs.h>
54 #include <linux/acpi.h>
55 #include <linux/reboot.h>
56 #include <linux/ftrace.h>
57 #include <linux/perf_event.h>
58 #include <linux/kprobes.h>
59 #include <linux/pipe_fs_i.h>
60 #include <linux/oom.h>
61 #include <linux/kmod.h>
62 #include <linux/capability.h>
63 #include <linux/binfmts.h>
64 #include <linux/sched/sysctl.h>
65 #include <linux/sched/coredump.h>
66 #include <linux/kexec.h>
67 #include <linux/bpf.h>
68 #include <linux/mount.h>
69
70 #include <linux/uaccess.h>
71 #include <asm/processor.h>
72
73 #ifdef CONFIG_X86
74 #include <asm/nmi.h>
75 #include <asm/stacktrace.h>
76 #include <asm/io.h>
77 #endif
78 #ifdef CONFIG_SPARC
79 #include <asm/setup.h>
80 #endif
81 #ifdef CONFIG_BSD_PROCESS_ACCT
82 #include <linux/acct.h>
83 #endif
84 #ifdef CONFIG_RT_MUTEXES
85 #include <linux/rtmutex.h>
86 #endif
87 #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
88 #include <linux/lockdep.h>
89 #endif
90 #ifdef CONFIG_CHR_DEV_SG
91 #include <scsi/sg.h>
92 #endif
93
94 #ifdef CONFIG_LOCKUP_DETECTOR
95 #include <linux/nmi.h>
96 #endif
97
98 #if defined(CONFIG_SYSCTL)
99
100 /* External variables not in a header file. */
101 extern int suid_dumpable;
102 #ifdef CONFIG_COREDUMP
103 extern int core_uses_pid;
104 extern char core_pattern[];
105 extern unsigned int core_pipe_limit;
106 #endif
107 extern int pid_max;
108 extern int pid_max_min, pid_max_max;
109 extern int percpu_pagelist_fraction;
110 extern int latencytop_enabled;
111 extern unsigned int sysctl_nr_open_min, sysctl_nr_open_max;
112 #ifndef CONFIG_MMU
113 extern int sysctl_nr_trim_pages;
114 #endif
115
116 /* Constants used for minimum and maximum */
117 #ifdef CONFIG_LOCKUP_DETECTOR
118 static int sixty = 60;
119 #endif
120
121 static int __maybe_unused neg_one = -1;
122
123 static int zero;
124 static int __maybe_unused one = 1;
125 static int __maybe_unused two = 2;
126 static int __maybe_unused four = 4;
127 static unsigned long one_ul = 1;
128 static int one_hundred = 100;
129 static int one_thousand = 1000;
130 #ifdef CONFIG_PRINTK
131 static int ten_thousand = 10000;
132 #endif
133 #ifdef CONFIG_PERF_EVENTS
134 static int six_hundred_forty_kb = 640 * 1024;
135 #endif
136
137 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
138 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
139
140 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
141 static int maxolduid = 65535;
142 static int minolduid;
143
144 static int ngroups_max = NGROUPS_MAX;
145 static const int cap_last_cap = CAP_LAST_CAP;
146
147 /*this is needed for proc_doulongvec_minmax of sysctl_hung_task_timeout_secs */
148 #ifdef CONFIG_DETECT_HUNG_TASK
149 static unsigned long hung_task_timeout_max = (LONG_MAX/HZ);
150 #endif
151
152 #ifdef CONFIG_INOTIFY_USER
153 #include <linux/inotify.h>
154 #endif
155 #ifdef CONFIG_SPARC
156 #endif
157
158 #ifdef __hppa__
159 extern int pwrsw_enabled;
160 #endif
161
162 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
163 extern int unaligned_enabled;
164 #endif
165
166 #ifdef CONFIG_IA64
167 extern int unaligned_dump_stack;
168 #endif
169
170 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
171 extern int no_unaligned_warning;
172 #endif
173
174 #ifdef CONFIG_PROC_SYSCTL
175
176 /**
177 * enum sysctl_writes_mode - supported sysctl write modes
178 *
179 * @SYSCTL_WRITES_LEGACY: each write syscall must fully contain the sysctl value
180 * to be written, and multiple writes on the same sysctl file descriptor
181 * will rewrite the sysctl value, regardless of file position. No warning
182 * is issued when the initial position is not 0.
183 * @SYSCTL_WRITES_WARN: same as above but warn when the initial file position is
184 * not 0.
185 * @SYSCTL_WRITES_STRICT: writes to numeric sysctl entries must always be at
186 * file position 0 and the value must be fully contained in the buffer
187 * sent to the write syscall. If dealing with strings respect the file
188 * position, but restrict this to the max length of the buffer, anything
189 * passed the max lenght will be ignored. Multiple writes will append
190 * to the buffer.
191 *
192 * These write modes control how current file position affects the behavior of
193 * updating sysctl values through the proc interface on each write.
194 */
195 enum sysctl_writes_mode {
196 SYSCTL_WRITES_LEGACY = -1,
197 SYSCTL_WRITES_WARN = 0,
198 SYSCTL_WRITES_STRICT = 1,
199 };
200
201 static enum sysctl_writes_mode sysctl_writes_strict = SYSCTL_WRITES_STRICT;
202
203 static int proc_do_cad_pid(struct ctl_table *table, int write,
204 void __user *buffer, size_t *lenp, loff_t *ppos);
205 static int proc_taint(struct ctl_table *table, int write,
206 void __user *buffer, size_t *lenp, loff_t *ppos);
207 #endif
208
209 #ifdef CONFIG_PRINTK
210 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
211 void __user *buffer, size_t *lenp, loff_t *ppos);
212 #endif
213
214 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
215 void __user *buffer, size_t *lenp, loff_t *ppos);
216 #ifdef CONFIG_COREDUMP
217 static int proc_dostring_coredump(struct ctl_table *table, int write,
218 void __user *buffer, size_t *lenp, loff_t *ppos);
219 #endif
220
221 #ifdef CONFIG_MAGIC_SYSRQ
222 /* Note: sysrq code uses it's own private copy */
223 static int __sysrq_enabled = CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE;
224
225 static int sysrq_sysctl_handler(struct ctl_table *table, int write,
226 void __user *buffer, size_t *lenp,
227 loff_t *ppos)
228 {
229 int error;
230
231 error = proc_dointvec(table, write, buffer, lenp, ppos);
232 if (error)
233 return error;
234
235 if (write)
236 sysrq_toggle_support(__sysrq_enabled);
237
238 return 0;
239 }
240
241 #endif
242
243 static struct ctl_table kern_table[];
244 static struct ctl_table vm_table[];
245 static struct ctl_table fs_table[];
246 static struct ctl_table debug_table[];
247 static struct ctl_table dev_table[];
248 extern struct ctl_table random_table[];
249 #ifdef CONFIG_EPOLL
250 extern struct ctl_table epoll_table[];
251 #endif
252
253 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
254 int sysctl_legacy_va_layout;
255 #endif
256
257 /* The default sysctl tables: */
258
259 static struct ctl_table sysctl_base_table[] = {
260 {
261 .procname = "kernel",
262 .mode = 0555,
263 .child = kern_table,
264 },
265 {
266 .procname = "vm",
267 .mode = 0555,
268 .child = vm_table,
269 },
270 {
271 .procname = "fs",
272 .mode = 0555,
273 .child = fs_table,
274 },
275 {
276 .procname = "debug",
277 .mode = 0555,
278 .child = debug_table,
279 },
280 {
281 .procname = "dev",
282 .mode = 0555,
283 .child = dev_table,
284 },
285 { }
286 };
287
288 #ifdef CONFIG_SCHED_DEBUG
289 static int min_sched_granularity_ns = 100000; /* 100 usecs */
290 static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */
291 static int min_wakeup_granularity_ns; /* 0 usecs */
292 static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */
293 #ifdef CONFIG_SMP
294 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
295 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
296 #endif /* CONFIG_SMP */
297 #endif /* CONFIG_SCHED_DEBUG */
298
299 #ifdef CONFIG_COMPACTION
300 static int min_extfrag_threshold;
301 static int max_extfrag_threshold = 1000;
302 #endif
303
304 static struct ctl_table kern_table[] = {
305 {
306 .procname = "sched_child_runs_first",
307 .data = &sysctl_sched_child_runs_first,
308 .maxlen = sizeof(unsigned int),
309 .mode = 0644,
310 .proc_handler = proc_dointvec,
311 },
312 #ifdef CONFIG_SCHED_DEBUG
313 {
314 .procname = "sched_min_granularity_ns",
315 .data = &sysctl_sched_min_granularity,
316 .maxlen = sizeof(unsigned int),
317 .mode = 0644,
318 .proc_handler = sched_proc_update_handler,
319 .extra1 = &min_sched_granularity_ns,
320 .extra2 = &max_sched_granularity_ns,
321 },
322 {
323 .procname = "sched_latency_ns",
324 .data = &sysctl_sched_latency,
325 .maxlen = sizeof(unsigned int),
326 .mode = 0644,
327 .proc_handler = sched_proc_update_handler,
328 .extra1 = &min_sched_granularity_ns,
329 .extra2 = &max_sched_granularity_ns,
330 },
331 {
332 .procname = "sched_wakeup_granularity_ns",
333 .data = &sysctl_sched_wakeup_granularity,
334 .maxlen = sizeof(unsigned int),
335 .mode = 0644,
336 .proc_handler = sched_proc_update_handler,
337 .extra1 = &min_wakeup_granularity_ns,
338 .extra2 = &max_wakeup_granularity_ns,
339 },
340 #ifdef CONFIG_SMP
341 {
342 .procname = "sched_tunable_scaling",
343 .data = &sysctl_sched_tunable_scaling,
344 .maxlen = sizeof(enum sched_tunable_scaling),
345 .mode = 0644,
346 .proc_handler = sched_proc_update_handler,
347 .extra1 = &min_sched_tunable_scaling,
348 .extra2 = &max_sched_tunable_scaling,
349 },
350 {
351 .procname = "sched_migration_cost_ns",
352 .data = &sysctl_sched_migration_cost,
353 .maxlen = sizeof(unsigned int),
354 .mode = 0644,
355 .proc_handler = proc_dointvec,
356 },
357 {
358 .procname = "sched_nr_migrate",
359 .data = &sysctl_sched_nr_migrate,
360 .maxlen = sizeof(unsigned int),
361 .mode = 0644,
362 .proc_handler = proc_dointvec,
363 },
364 {
365 .procname = "sched_time_avg_ms",
366 .data = &sysctl_sched_time_avg,
367 .maxlen = sizeof(unsigned int),
368 .mode = 0644,
369 .proc_handler = proc_dointvec_minmax,
370 .extra1 = &one,
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_user_enabled,
893 .maxlen = sizeof(int),
894 .mode = NMI_WATCHDOG_SYSCTL_PERM,
895 .proc_handler = proc_nmi_watchdog,
896 .extra1 = &zero,
897 .extra2 = &one,
898 },
899 {
900 .procname = "watchdog_cpumask",
901 .data = &watchdog_cpumask_bits,
902 .maxlen = NR_CPUS,
903 .mode = 0644,
904 .proc_handler = proc_watchdog_cpumask,
905 },
906 #ifdef CONFIG_SOFTLOCKUP_DETECTOR
907 {
908 .procname = "soft_watchdog",
909 .data = &soft_watchdog_user_enabled,
910 .maxlen = sizeof(int),
911 .mode = 0644,
912 .proc_handler = proc_soft_watchdog,
913 .extra1 = &zero,
914 .extra2 = &one,
915 },
916 {
917 .procname = "softlockup_panic",
918 .data = &softlockup_panic,
919 .maxlen = sizeof(int),
920 .mode = 0644,
921 .proc_handler = proc_dointvec_minmax,
922 .extra1 = &zero,
923 .extra2 = &one,
924 },
925 #ifdef CONFIG_SMP
926 {
927 .procname = "softlockup_all_cpu_backtrace",
928 .data = &sysctl_softlockup_all_cpu_backtrace,
929 .maxlen = sizeof(int),
930 .mode = 0644,
931 .proc_handler = proc_dointvec_minmax,
932 .extra1 = &zero,
933 .extra2 = &one,
934 },
935 #endif /* CONFIG_SMP */
936 #endif
937 #ifdef CONFIG_HARDLOCKUP_DETECTOR
938 {
939 .procname = "hardlockup_panic",
940 .data = &hardlockup_panic,
941 .maxlen = sizeof(int),
942 .mode = 0644,
943 .proc_handler = proc_dointvec_minmax,
944 .extra1 = &zero,
945 .extra2 = &one,
946 },
947 #ifdef CONFIG_SMP
948 {
949 .procname = "hardlockup_all_cpu_backtrace",
950 .data = &sysctl_hardlockup_all_cpu_backtrace,
951 .maxlen = sizeof(int),
952 .mode = 0644,
953 .proc_handler = proc_dointvec_minmax,
954 .extra1 = &zero,
955 .extra2 = &one,
956 },
957 #endif /* CONFIG_SMP */
958 #endif
959 #endif
960
961 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
962 {
963 .procname = "unknown_nmi_panic",
964 .data = &unknown_nmi_panic,
965 .maxlen = sizeof (int),
966 .mode = 0644,
967 .proc_handler = proc_dointvec,
968 },
969 #endif
970 #if defined(CONFIG_X86)
971 {
972 .procname = "panic_on_unrecovered_nmi",
973 .data = &panic_on_unrecovered_nmi,
974 .maxlen = sizeof(int),
975 .mode = 0644,
976 .proc_handler = proc_dointvec,
977 },
978 {
979 .procname = "panic_on_io_nmi",
980 .data = &panic_on_io_nmi,
981 .maxlen = sizeof(int),
982 .mode = 0644,
983 .proc_handler = proc_dointvec,
984 },
985 #ifdef CONFIG_DEBUG_STACKOVERFLOW
986 {
987 .procname = "panic_on_stackoverflow",
988 .data = &sysctl_panic_on_stackoverflow,
989 .maxlen = sizeof(int),
990 .mode = 0644,
991 .proc_handler = proc_dointvec,
992 },
993 #endif
994 {
995 .procname = "bootloader_type",
996 .data = &bootloader_type,
997 .maxlen = sizeof (int),
998 .mode = 0444,
999 .proc_handler = proc_dointvec,
1000 },
1001 {
1002 .procname = "bootloader_version",
1003 .data = &bootloader_version,
1004 .maxlen = sizeof (int),
1005 .mode = 0444,
1006 .proc_handler = proc_dointvec,
1007 },
1008 {
1009 .procname = "io_delay_type",
1010 .data = &io_delay_type,
1011 .maxlen = sizeof(int),
1012 .mode = 0644,
1013 .proc_handler = proc_dointvec,
1014 },
1015 #endif
1016 #if defined(CONFIG_MMU)
1017 {
1018 .procname = "randomize_va_space",
1019 .data = &randomize_va_space,
1020 .maxlen = sizeof(int),
1021 .mode = 0644,
1022 .proc_handler = proc_dointvec,
1023 },
1024 #endif
1025 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
1026 {
1027 .procname = "spin_retry",
1028 .data = &spin_retry,
1029 .maxlen = sizeof (int),
1030 .mode = 0644,
1031 .proc_handler = proc_dointvec,
1032 },
1033 #endif
1034 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
1035 {
1036 .procname = "acpi_video_flags",
1037 .data = &acpi_realmode_flags,
1038 .maxlen = sizeof (unsigned long),
1039 .mode = 0644,
1040 .proc_handler = proc_doulongvec_minmax,
1041 },
1042 #endif
1043 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
1044 {
1045 .procname = "ignore-unaligned-usertrap",
1046 .data = &no_unaligned_warning,
1047 .maxlen = sizeof (int),
1048 .mode = 0644,
1049 .proc_handler = proc_dointvec,
1050 },
1051 #endif
1052 #ifdef CONFIG_IA64
1053 {
1054 .procname = "unaligned-dump-stack",
1055 .data = &unaligned_dump_stack,
1056 .maxlen = sizeof (int),
1057 .mode = 0644,
1058 .proc_handler = proc_dointvec,
1059 },
1060 #endif
1061 #ifdef CONFIG_DETECT_HUNG_TASK
1062 {
1063 .procname = "hung_task_panic",
1064 .data = &sysctl_hung_task_panic,
1065 .maxlen = sizeof(int),
1066 .mode = 0644,
1067 .proc_handler = proc_dointvec_minmax,
1068 .extra1 = &zero,
1069 .extra2 = &one,
1070 },
1071 {
1072 .procname = "hung_task_check_count",
1073 .data = &sysctl_hung_task_check_count,
1074 .maxlen = sizeof(int),
1075 .mode = 0644,
1076 .proc_handler = proc_dointvec_minmax,
1077 .extra1 = &zero,
1078 },
1079 {
1080 .procname = "hung_task_timeout_secs",
1081 .data = &sysctl_hung_task_timeout_secs,
1082 .maxlen = sizeof(unsigned long),
1083 .mode = 0644,
1084 .proc_handler = proc_dohung_task_timeout_secs,
1085 .extra2 = &hung_task_timeout_max,
1086 },
1087 {
1088 .procname = "hung_task_warnings",
1089 .data = &sysctl_hung_task_warnings,
1090 .maxlen = sizeof(int),
1091 .mode = 0644,
1092 .proc_handler = proc_dointvec_minmax,
1093 .extra1 = &neg_one,
1094 },
1095 #endif
1096 #ifdef CONFIG_RT_MUTEXES
1097 {
1098 .procname = "max_lock_depth",
1099 .data = &max_lock_depth,
1100 .maxlen = sizeof(int),
1101 .mode = 0644,
1102 .proc_handler = proc_dointvec,
1103 },
1104 #endif
1105 {
1106 .procname = "poweroff_cmd",
1107 .data = &poweroff_cmd,
1108 .maxlen = POWEROFF_CMD_PATH_LEN,
1109 .mode = 0644,
1110 .proc_handler = proc_dostring,
1111 },
1112 #ifdef CONFIG_KEYS
1113 {
1114 .procname = "keys",
1115 .mode = 0555,
1116 .child = key_sysctls,
1117 },
1118 #endif
1119 #ifdef CONFIG_PERF_EVENTS
1120 /*
1121 * User-space scripts rely on the existence of this file
1122 * as a feature check for perf_events being enabled.
1123 *
1124 * So it's an ABI, do not remove!
1125 */
1126 {
1127 .procname = "perf_event_paranoid",
1128 .data = &sysctl_perf_event_paranoid,
1129 .maxlen = sizeof(sysctl_perf_event_paranoid),
1130 .mode = 0644,
1131 .proc_handler = proc_dointvec,
1132 },
1133 {
1134 .procname = "perf_event_mlock_kb",
1135 .data = &sysctl_perf_event_mlock,
1136 .maxlen = sizeof(sysctl_perf_event_mlock),
1137 .mode = 0644,
1138 .proc_handler = proc_dointvec,
1139 },
1140 {
1141 .procname = "perf_event_max_sample_rate",
1142 .data = &sysctl_perf_event_sample_rate,
1143 .maxlen = sizeof(sysctl_perf_event_sample_rate),
1144 .mode = 0644,
1145 .proc_handler = perf_proc_update_handler,
1146 .extra1 = &one,
1147 },
1148 {
1149 .procname = "perf_cpu_time_max_percent",
1150 .data = &sysctl_perf_cpu_time_max_percent,
1151 .maxlen = sizeof(sysctl_perf_cpu_time_max_percent),
1152 .mode = 0644,
1153 .proc_handler = perf_cpu_time_max_percent_handler,
1154 .extra1 = &zero,
1155 .extra2 = &one_hundred,
1156 },
1157 {
1158 .procname = "perf_event_max_stack",
1159 .data = &sysctl_perf_event_max_stack,
1160 .maxlen = sizeof(sysctl_perf_event_max_stack),
1161 .mode = 0644,
1162 .proc_handler = perf_event_max_stack_handler,
1163 .extra1 = &zero,
1164 .extra2 = &six_hundred_forty_kb,
1165 },
1166 {
1167 .procname = "perf_event_max_contexts_per_stack",
1168 .data = &sysctl_perf_event_max_contexts_per_stack,
1169 .maxlen = sizeof(sysctl_perf_event_max_contexts_per_stack),
1170 .mode = 0644,
1171 .proc_handler = perf_event_max_stack_handler,
1172 .extra1 = &zero,
1173 .extra2 = &one_thousand,
1174 },
1175 #endif
1176 {
1177 .procname = "panic_on_warn",
1178 .data = &panic_on_warn,
1179 .maxlen = sizeof(int),
1180 .mode = 0644,
1181 .proc_handler = proc_dointvec_minmax,
1182 .extra1 = &zero,
1183 .extra2 = &one,
1184 },
1185 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON)
1186 {
1187 .procname = "timer_migration",
1188 .data = &sysctl_timer_migration,
1189 .maxlen = sizeof(unsigned int),
1190 .mode = 0644,
1191 .proc_handler = timer_migration_handler,
1192 .extra1 = &zero,
1193 .extra2 = &one,
1194 },
1195 #endif
1196 #ifdef CONFIG_BPF_SYSCALL
1197 {
1198 .procname = "unprivileged_bpf_disabled",
1199 .data = &sysctl_unprivileged_bpf_disabled,
1200 .maxlen = sizeof(sysctl_unprivileged_bpf_disabled),
1201 .mode = 0644,
1202 /* only handle a transition from default "0" to "1" */
1203 .proc_handler = proc_dointvec_minmax,
1204 .extra1 = &one,
1205 .extra2 = &one,
1206 },
1207 #endif
1208 #if defined(CONFIG_TREE_RCU) || defined(CONFIG_PREEMPT_RCU)
1209 {
1210 .procname = "panic_on_rcu_stall",
1211 .data = &sysctl_panic_on_rcu_stall,
1212 .maxlen = sizeof(sysctl_panic_on_rcu_stall),
1213 .mode = 0644,
1214 .proc_handler = proc_dointvec_minmax,
1215 .extra1 = &zero,
1216 .extra2 = &one,
1217 },
1218 #endif
1219 { }
1220 };
1221
1222 static struct ctl_table vm_table[] = {
1223 {
1224 .procname = "overcommit_memory",
1225 .data = &sysctl_overcommit_memory,
1226 .maxlen = sizeof(sysctl_overcommit_memory),
1227 .mode = 0644,
1228 .proc_handler = proc_dointvec_minmax,
1229 .extra1 = &zero,
1230 .extra2 = &two,
1231 },
1232 {
1233 .procname = "panic_on_oom",
1234 .data = &sysctl_panic_on_oom,
1235 .maxlen = sizeof(sysctl_panic_on_oom),
1236 .mode = 0644,
1237 .proc_handler = proc_dointvec_minmax,
1238 .extra1 = &zero,
1239 .extra2 = &two,
1240 },
1241 {
1242 .procname = "oom_kill_allocating_task",
1243 .data = &sysctl_oom_kill_allocating_task,
1244 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
1245 .mode = 0644,
1246 .proc_handler = proc_dointvec,
1247 },
1248 {
1249 .procname = "oom_dump_tasks",
1250 .data = &sysctl_oom_dump_tasks,
1251 .maxlen = sizeof(sysctl_oom_dump_tasks),
1252 .mode = 0644,
1253 .proc_handler = proc_dointvec,
1254 },
1255 {
1256 .procname = "overcommit_ratio",
1257 .data = &sysctl_overcommit_ratio,
1258 .maxlen = sizeof(sysctl_overcommit_ratio),
1259 .mode = 0644,
1260 .proc_handler = overcommit_ratio_handler,
1261 },
1262 {
1263 .procname = "overcommit_kbytes",
1264 .data = &sysctl_overcommit_kbytes,
1265 .maxlen = sizeof(sysctl_overcommit_kbytes),
1266 .mode = 0644,
1267 .proc_handler = overcommit_kbytes_handler,
1268 },
1269 {
1270 .procname = "page-cluster",
1271 .data = &page_cluster,
1272 .maxlen = sizeof(int),
1273 .mode = 0644,
1274 .proc_handler = proc_dointvec_minmax,
1275 .extra1 = &zero,
1276 },
1277 {
1278 .procname = "dirty_background_ratio",
1279 .data = &dirty_background_ratio,
1280 .maxlen = sizeof(dirty_background_ratio),
1281 .mode = 0644,
1282 .proc_handler = dirty_background_ratio_handler,
1283 .extra1 = &zero,
1284 .extra2 = &one_hundred,
1285 },
1286 {
1287 .procname = "dirty_background_bytes",
1288 .data = &dirty_background_bytes,
1289 .maxlen = sizeof(dirty_background_bytes),
1290 .mode = 0644,
1291 .proc_handler = dirty_background_bytes_handler,
1292 .extra1 = &one_ul,
1293 },
1294 {
1295 .procname = "dirty_ratio",
1296 .data = &vm_dirty_ratio,
1297 .maxlen = sizeof(vm_dirty_ratio),
1298 .mode = 0644,
1299 .proc_handler = dirty_ratio_handler,
1300 .extra1 = &zero,
1301 .extra2 = &one_hundred,
1302 },
1303 {
1304 .procname = "dirty_bytes",
1305 .data = &vm_dirty_bytes,
1306 .maxlen = sizeof(vm_dirty_bytes),
1307 .mode = 0644,
1308 .proc_handler = dirty_bytes_handler,
1309 .extra1 = &dirty_bytes_min,
1310 },
1311 {
1312 .procname = "dirty_writeback_centisecs",
1313 .data = &dirty_writeback_interval,
1314 .maxlen = sizeof(dirty_writeback_interval),
1315 .mode = 0644,
1316 .proc_handler = dirty_writeback_centisecs_handler,
1317 },
1318 {
1319 .procname = "dirty_expire_centisecs",
1320 .data = &dirty_expire_interval,
1321 .maxlen = sizeof(dirty_expire_interval),
1322 .mode = 0644,
1323 .proc_handler = proc_dointvec_minmax,
1324 .extra1 = &zero,
1325 },
1326 {
1327 .procname = "dirtytime_expire_seconds",
1328 .data = &dirtytime_expire_interval,
1329 .maxlen = sizeof(dirty_expire_interval),
1330 .mode = 0644,
1331 .proc_handler = dirtytime_interval_handler,
1332 .extra1 = &zero,
1333 },
1334 {
1335 .procname = "swappiness",
1336 .data = &vm_swappiness,
1337 .maxlen = sizeof(vm_swappiness),
1338 .mode = 0644,
1339 .proc_handler = proc_dointvec_minmax,
1340 .extra1 = &zero,
1341 .extra2 = &one_hundred,
1342 },
1343 #ifdef CONFIG_HUGETLB_PAGE
1344 {
1345 .procname = "nr_hugepages",
1346 .data = NULL,
1347 .maxlen = sizeof(unsigned long),
1348 .mode = 0644,
1349 .proc_handler = hugetlb_sysctl_handler,
1350 },
1351 #ifdef CONFIG_NUMA
1352 {
1353 .procname = "nr_hugepages_mempolicy",
1354 .data = NULL,
1355 .maxlen = sizeof(unsigned long),
1356 .mode = 0644,
1357 .proc_handler = &hugetlb_mempolicy_sysctl_handler,
1358 },
1359 {
1360 .procname = "numa_stat",
1361 .data = &sysctl_vm_numa_stat,
1362 .maxlen = sizeof(int),
1363 .mode = 0644,
1364 .proc_handler = sysctl_vm_numa_stat_handler,
1365 .extra1 = &zero,
1366 .extra2 = &one,
1367 },
1368 #endif
1369 {
1370 .procname = "hugetlb_shm_group",
1371 .data = &sysctl_hugetlb_shm_group,
1372 .maxlen = sizeof(gid_t),
1373 .mode = 0644,
1374 .proc_handler = proc_dointvec,
1375 },
1376 {
1377 .procname = "hugepages_treat_as_movable",
1378 .data = &hugepages_treat_as_movable,
1379 .maxlen = sizeof(int),
1380 .mode = 0644,
1381 .proc_handler = proc_dointvec,
1382 },
1383 {
1384 .procname = "nr_overcommit_hugepages",
1385 .data = NULL,
1386 .maxlen = sizeof(unsigned long),
1387 .mode = 0644,
1388 .proc_handler = hugetlb_overcommit_handler,
1389 },
1390 #endif
1391 {
1392 .procname = "lowmem_reserve_ratio",
1393 .data = &sysctl_lowmem_reserve_ratio,
1394 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1395 .mode = 0644,
1396 .proc_handler = lowmem_reserve_ratio_sysctl_handler,
1397 },
1398 {
1399 .procname = "drop_caches",
1400 .data = &sysctl_drop_caches,
1401 .maxlen = sizeof(int),
1402 .mode = 0644,
1403 .proc_handler = drop_caches_sysctl_handler,
1404 .extra1 = &one,
1405 .extra2 = &four,
1406 },
1407 #ifdef CONFIG_COMPACTION
1408 {
1409 .procname = "compact_memory",
1410 .data = &sysctl_compact_memory,
1411 .maxlen = sizeof(int),
1412 .mode = 0200,
1413 .proc_handler = sysctl_compaction_handler,
1414 },
1415 {
1416 .procname = "extfrag_threshold",
1417 .data = &sysctl_extfrag_threshold,
1418 .maxlen = sizeof(int),
1419 .mode = 0644,
1420 .proc_handler = sysctl_extfrag_handler,
1421 .extra1 = &min_extfrag_threshold,
1422 .extra2 = &max_extfrag_threshold,
1423 },
1424 {
1425 .procname = "compact_unevictable_allowed",
1426 .data = &sysctl_compact_unevictable_allowed,
1427 .maxlen = sizeof(int),
1428 .mode = 0644,
1429 .proc_handler = proc_dointvec,
1430 .extra1 = &zero,
1431 .extra2 = &one,
1432 },
1433
1434 #endif /* CONFIG_COMPACTION */
1435 {
1436 .procname = "min_free_kbytes",
1437 .data = &min_free_kbytes,
1438 .maxlen = sizeof(min_free_kbytes),
1439 .mode = 0644,
1440 .proc_handler = min_free_kbytes_sysctl_handler,
1441 .extra1 = &zero,
1442 },
1443 {
1444 .procname = "watermark_scale_factor",
1445 .data = &watermark_scale_factor,
1446 .maxlen = sizeof(watermark_scale_factor),
1447 .mode = 0644,
1448 .proc_handler = watermark_scale_factor_sysctl_handler,
1449 .extra1 = &one,
1450 .extra2 = &one_thousand,
1451 },
1452 {
1453 .procname = "percpu_pagelist_fraction",
1454 .data = &percpu_pagelist_fraction,
1455 .maxlen = sizeof(percpu_pagelist_fraction),
1456 .mode = 0644,
1457 .proc_handler = percpu_pagelist_fraction_sysctl_handler,
1458 .extra1 = &zero,
1459 },
1460 #ifdef CONFIG_MMU
1461 {
1462 .procname = "max_map_count",
1463 .data = &sysctl_max_map_count,
1464 .maxlen = sizeof(sysctl_max_map_count),
1465 .mode = 0644,
1466 .proc_handler = proc_dointvec_minmax,
1467 .extra1 = &zero,
1468 },
1469 #else
1470 {
1471 .procname = "nr_trim_pages",
1472 .data = &sysctl_nr_trim_pages,
1473 .maxlen = sizeof(sysctl_nr_trim_pages),
1474 .mode = 0644,
1475 .proc_handler = proc_dointvec_minmax,
1476 .extra1 = &zero,
1477 },
1478 #endif
1479 {
1480 .procname = "laptop_mode",
1481 .data = &laptop_mode,
1482 .maxlen = sizeof(laptop_mode),
1483 .mode = 0644,
1484 .proc_handler = proc_dointvec_jiffies,
1485 },
1486 {
1487 .procname = "block_dump",
1488 .data = &block_dump,
1489 .maxlen = sizeof(block_dump),
1490 .mode = 0644,
1491 .proc_handler = proc_dointvec,
1492 .extra1 = &zero,
1493 },
1494 {
1495 .procname = "vfs_cache_pressure",
1496 .data = &sysctl_vfs_cache_pressure,
1497 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1498 .mode = 0644,
1499 .proc_handler = proc_dointvec,
1500 .extra1 = &zero,
1501 },
1502 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1503 {
1504 .procname = "legacy_va_layout",
1505 .data = &sysctl_legacy_va_layout,
1506 .maxlen = sizeof(sysctl_legacy_va_layout),
1507 .mode = 0644,
1508 .proc_handler = proc_dointvec,
1509 .extra1 = &zero,
1510 },
1511 #endif
1512 #ifdef CONFIG_NUMA
1513 {
1514 .procname = "zone_reclaim_mode",
1515 .data = &node_reclaim_mode,
1516 .maxlen = sizeof(node_reclaim_mode),
1517 .mode = 0644,
1518 .proc_handler = proc_dointvec,
1519 .extra1 = &zero,
1520 },
1521 {
1522 .procname = "min_unmapped_ratio",
1523 .data = &sysctl_min_unmapped_ratio,
1524 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1525 .mode = 0644,
1526 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler,
1527 .extra1 = &zero,
1528 .extra2 = &one_hundred,
1529 },
1530 {
1531 .procname = "min_slab_ratio",
1532 .data = &sysctl_min_slab_ratio,
1533 .maxlen = sizeof(sysctl_min_slab_ratio),
1534 .mode = 0644,
1535 .proc_handler = sysctl_min_slab_ratio_sysctl_handler,
1536 .extra1 = &zero,
1537 .extra2 = &one_hundred,
1538 },
1539 #endif
1540 #ifdef CONFIG_SMP
1541 {
1542 .procname = "stat_interval",
1543 .data = &sysctl_stat_interval,
1544 .maxlen = sizeof(sysctl_stat_interval),
1545 .mode = 0644,
1546 .proc_handler = proc_dointvec_jiffies,
1547 },
1548 {
1549 .procname = "stat_refresh",
1550 .data = NULL,
1551 .maxlen = 0,
1552 .mode = 0600,
1553 .proc_handler = vmstat_refresh,
1554 },
1555 #endif
1556 #ifdef CONFIG_MMU
1557 {
1558 .procname = "mmap_min_addr",
1559 .data = &dac_mmap_min_addr,
1560 .maxlen = sizeof(unsigned long),
1561 .mode = 0644,
1562 .proc_handler = mmap_min_addr_handler,
1563 },
1564 #endif
1565 #ifdef CONFIG_NUMA
1566 {
1567 .procname = "numa_zonelist_order",
1568 .data = &numa_zonelist_order,
1569 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1570 .mode = 0644,
1571 .proc_handler = numa_zonelist_order_handler,
1572 },
1573 #endif
1574 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1575 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1576 {
1577 .procname = "vdso_enabled",
1578 #ifdef CONFIG_X86_32
1579 .data = &vdso32_enabled,
1580 .maxlen = sizeof(vdso32_enabled),
1581 #else
1582 .data = &vdso_enabled,
1583 .maxlen = sizeof(vdso_enabled),
1584 #endif
1585 .mode = 0644,
1586 .proc_handler = proc_dointvec,
1587 .extra1 = &zero,
1588 },
1589 #endif
1590 #ifdef CONFIG_HIGHMEM
1591 {
1592 .procname = "highmem_is_dirtyable",
1593 .data = &vm_highmem_is_dirtyable,
1594 .maxlen = sizeof(vm_highmem_is_dirtyable),
1595 .mode = 0644,
1596 .proc_handler = proc_dointvec_minmax,
1597 .extra1 = &zero,
1598 .extra2 = &one,
1599 },
1600 #endif
1601 #ifdef CONFIG_MEMORY_FAILURE
1602 {
1603 .procname = "memory_failure_early_kill",
1604 .data = &sysctl_memory_failure_early_kill,
1605 .maxlen = sizeof(sysctl_memory_failure_early_kill),
1606 .mode = 0644,
1607 .proc_handler = proc_dointvec_minmax,
1608 .extra1 = &zero,
1609 .extra2 = &one,
1610 },
1611 {
1612 .procname = "memory_failure_recovery",
1613 .data = &sysctl_memory_failure_recovery,
1614 .maxlen = sizeof(sysctl_memory_failure_recovery),
1615 .mode = 0644,
1616 .proc_handler = proc_dointvec_minmax,
1617 .extra1 = &zero,
1618 .extra2 = &one,
1619 },
1620 #endif
1621 {
1622 .procname = "user_reserve_kbytes",
1623 .data = &sysctl_user_reserve_kbytes,
1624 .maxlen = sizeof(sysctl_user_reserve_kbytes),
1625 .mode = 0644,
1626 .proc_handler = proc_doulongvec_minmax,
1627 },
1628 {
1629 .procname = "admin_reserve_kbytes",
1630 .data = &sysctl_admin_reserve_kbytes,
1631 .maxlen = sizeof(sysctl_admin_reserve_kbytes),
1632 .mode = 0644,
1633 .proc_handler = proc_doulongvec_minmax,
1634 },
1635 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS
1636 {
1637 .procname = "mmap_rnd_bits",
1638 .data = &mmap_rnd_bits,
1639 .maxlen = sizeof(mmap_rnd_bits),
1640 .mode = 0600,
1641 .proc_handler = proc_dointvec_minmax,
1642 .extra1 = (void *)&mmap_rnd_bits_min,
1643 .extra2 = (void *)&mmap_rnd_bits_max,
1644 },
1645 #endif
1646 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS
1647 {
1648 .procname = "mmap_rnd_compat_bits",
1649 .data = &mmap_rnd_compat_bits,
1650 .maxlen = sizeof(mmap_rnd_compat_bits),
1651 .mode = 0600,
1652 .proc_handler = proc_dointvec_minmax,
1653 .extra1 = (void *)&mmap_rnd_compat_bits_min,
1654 .extra2 = (void *)&mmap_rnd_compat_bits_max,
1655 },
1656 #endif
1657 { }
1658 };
1659
1660 static struct ctl_table fs_table[] = {
1661 {
1662 .procname = "inode-nr",
1663 .data = &inodes_stat,
1664 .maxlen = 2*sizeof(long),
1665 .mode = 0444,
1666 .proc_handler = proc_nr_inodes,
1667 },
1668 {
1669 .procname = "inode-state",
1670 .data = &inodes_stat,
1671 .maxlen = 7*sizeof(long),
1672 .mode = 0444,
1673 .proc_handler = proc_nr_inodes,
1674 },
1675 {
1676 .procname = "file-nr",
1677 .data = &files_stat,
1678 .maxlen = sizeof(files_stat),
1679 .mode = 0444,
1680 .proc_handler = proc_nr_files,
1681 },
1682 {
1683 .procname = "file-max",
1684 .data = &files_stat.max_files,
1685 .maxlen = sizeof(files_stat.max_files),
1686 .mode = 0644,
1687 .proc_handler = proc_doulongvec_minmax,
1688 },
1689 {
1690 .procname = "nr_open",
1691 .data = &sysctl_nr_open,
1692 .maxlen = sizeof(unsigned int),
1693 .mode = 0644,
1694 .proc_handler = proc_dointvec_minmax,
1695 .extra1 = &sysctl_nr_open_min,
1696 .extra2 = &sysctl_nr_open_max,
1697 },
1698 {
1699 .procname = "dentry-state",
1700 .data = &dentry_stat,
1701 .maxlen = 6*sizeof(long),
1702 .mode = 0444,
1703 .proc_handler = proc_nr_dentry,
1704 },
1705 {
1706 .procname = "overflowuid",
1707 .data = &fs_overflowuid,
1708 .maxlen = sizeof(int),
1709 .mode = 0644,
1710 .proc_handler = proc_dointvec_minmax,
1711 .extra1 = &minolduid,
1712 .extra2 = &maxolduid,
1713 },
1714 {
1715 .procname = "overflowgid",
1716 .data = &fs_overflowgid,
1717 .maxlen = sizeof(int),
1718 .mode = 0644,
1719 .proc_handler = proc_dointvec_minmax,
1720 .extra1 = &minolduid,
1721 .extra2 = &maxolduid,
1722 },
1723 #ifdef CONFIG_FILE_LOCKING
1724 {
1725 .procname = "leases-enable",
1726 .data = &leases_enable,
1727 .maxlen = sizeof(int),
1728 .mode = 0644,
1729 .proc_handler = proc_dointvec,
1730 },
1731 #endif
1732 #ifdef CONFIG_DNOTIFY
1733 {
1734 .procname = "dir-notify-enable",
1735 .data = &dir_notify_enable,
1736 .maxlen = sizeof(int),
1737 .mode = 0644,
1738 .proc_handler = proc_dointvec,
1739 },
1740 #endif
1741 #ifdef CONFIG_MMU
1742 #ifdef CONFIG_FILE_LOCKING
1743 {
1744 .procname = "lease-break-time",
1745 .data = &lease_break_time,
1746 .maxlen = sizeof(int),
1747 .mode = 0644,
1748 .proc_handler = proc_dointvec,
1749 },
1750 #endif
1751 #ifdef CONFIG_AIO
1752 {
1753 .procname = "aio-nr",
1754 .data = &aio_nr,
1755 .maxlen = sizeof(aio_nr),
1756 .mode = 0444,
1757 .proc_handler = proc_doulongvec_minmax,
1758 },
1759 {
1760 .procname = "aio-max-nr",
1761 .data = &aio_max_nr,
1762 .maxlen = sizeof(aio_max_nr),
1763 .mode = 0644,
1764 .proc_handler = proc_doulongvec_minmax,
1765 },
1766 #endif /* CONFIG_AIO */
1767 #ifdef CONFIG_INOTIFY_USER
1768 {
1769 .procname = "inotify",
1770 .mode = 0555,
1771 .child = inotify_table,
1772 },
1773 #endif
1774 #ifdef CONFIG_EPOLL
1775 {
1776 .procname = "epoll",
1777 .mode = 0555,
1778 .child = epoll_table,
1779 },
1780 #endif
1781 #endif
1782 {
1783 .procname = "protected_symlinks",
1784 .data = &sysctl_protected_symlinks,
1785 .maxlen = sizeof(int),
1786 .mode = 0600,
1787 .proc_handler = proc_dointvec_minmax,
1788 .extra1 = &zero,
1789 .extra2 = &one,
1790 },
1791 {
1792 .procname = "protected_hardlinks",
1793 .data = &sysctl_protected_hardlinks,
1794 .maxlen = sizeof(int),
1795 .mode = 0600,
1796 .proc_handler = proc_dointvec_minmax,
1797 .extra1 = &zero,
1798 .extra2 = &one,
1799 },
1800 {
1801 .procname = "suid_dumpable",
1802 .data = &suid_dumpable,
1803 .maxlen = sizeof(int),
1804 .mode = 0644,
1805 .proc_handler = proc_dointvec_minmax_coredump,
1806 .extra1 = &zero,
1807 .extra2 = &two,
1808 },
1809 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1810 {
1811 .procname = "binfmt_misc",
1812 .mode = 0555,
1813 .child = sysctl_mount_point,
1814 },
1815 #endif
1816 {
1817 .procname = "pipe-max-size",
1818 .data = &pipe_max_size,
1819 .maxlen = sizeof(int),
1820 .mode = 0644,
1821 .proc_handler = &pipe_proc_fn,
1822 .extra1 = &pipe_min_size,
1823 },
1824 {
1825 .procname = "pipe-user-pages-hard",
1826 .data = &pipe_user_pages_hard,
1827 .maxlen = sizeof(pipe_user_pages_hard),
1828 .mode = 0644,
1829 .proc_handler = proc_doulongvec_minmax,
1830 },
1831 {
1832 .procname = "pipe-user-pages-soft",
1833 .data = &pipe_user_pages_soft,
1834 .maxlen = sizeof(pipe_user_pages_soft),
1835 .mode = 0644,
1836 .proc_handler = proc_doulongvec_minmax,
1837 },
1838 {
1839 .procname = "mount-max",
1840 .data = &sysctl_mount_max,
1841 .maxlen = sizeof(unsigned int),
1842 .mode = 0644,
1843 .proc_handler = proc_dointvec_minmax,
1844 .extra1 = &one,
1845 },
1846 { }
1847 };
1848
1849 static struct ctl_table debug_table[] = {
1850 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
1851 {
1852 .procname = "exception-trace",
1853 .data = &show_unhandled_signals,
1854 .maxlen = sizeof(int),
1855 .mode = 0644,
1856 .proc_handler = proc_dointvec
1857 },
1858 #endif
1859 #if defined(CONFIG_OPTPROBES)
1860 {
1861 .procname = "kprobes-optimization",
1862 .data = &sysctl_kprobes_optimization,
1863 .maxlen = sizeof(int),
1864 .mode = 0644,
1865 .proc_handler = proc_kprobes_optimization_handler,
1866 .extra1 = &zero,
1867 .extra2 = &one,
1868 },
1869 #endif
1870 { }
1871 };
1872
1873 static struct ctl_table dev_table[] = {
1874 { }
1875 };
1876
1877 int __init sysctl_init(void)
1878 {
1879 struct ctl_table_header *hdr;
1880
1881 hdr = register_sysctl_table(sysctl_base_table);
1882 kmemleak_not_leak(hdr);
1883 return 0;
1884 }
1885
1886 #endif /* CONFIG_SYSCTL */
1887
1888 /*
1889 * /proc/sys support
1890 */
1891
1892 #ifdef CONFIG_PROC_SYSCTL
1893
1894 static int _proc_do_string(char *data, int maxlen, int write,
1895 char __user *buffer,
1896 size_t *lenp, loff_t *ppos)
1897 {
1898 size_t len;
1899 char __user *p;
1900 char c;
1901
1902 if (!data || !maxlen || !*lenp) {
1903 *lenp = 0;
1904 return 0;
1905 }
1906
1907 if (write) {
1908 if (sysctl_writes_strict == SYSCTL_WRITES_STRICT) {
1909 /* Only continue writes not past the end of buffer. */
1910 len = strlen(data);
1911 if (len > maxlen - 1)
1912 len = maxlen - 1;
1913
1914 if (*ppos > len)
1915 return 0;
1916 len = *ppos;
1917 } else {
1918 /* Start writing from beginning of buffer. */
1919 len = 0;
1920 }
1921
1922 *ppos += *lenp;
1923 p = buffer;
1924 while ((p - buffer) < *lenp && len < maxlen - 1) {
1925 if (get_user(c, p++))
1926 return -EFAULT;
1927 if (c == 0 || c == '\n')
1928 break;
1929 data[len++] = c;
1930 }
1931 data[len] = 0;
1932 } else {
1933 len = strlen(data);
1934 if (len > maxlen)
1935 len = maxlen;
1936
1937 if (*ppos > len) {
1938 *lenp = 0;
1939 return 0;
1940 }
1941
1942 data += *ppos;
1943 len -= *ppos;
1944
1945 if (len > *lenp)
1946 len = *lenp;
1947 if (len)
1948 if (copy_to_user(buffer, data, len))
1949 return -EFAULT;
1950 if (len < *lenp) {
1951 if (put_user('\n', buffer + len))
1952 return -EFAULT;
1953 len++;
1954 }
1955 *lenp = len;
1956 *ppos += len;
1957 }
1958 return 0;
1959 }
1960
1961 static void warn_sysctl_write(struct ctl_table *table)
1962 {
1963 pr_warn_once("%s wrote to %s when file position was not 0!\n"
1964 "This will not be supported in the future. To silence this\n"
1965 "warning, set kernel.sysctl_writes_strict = -1\n",
1966 current->comm, table->procname);
1967 }
1968
1969 /**
1970 * proc_first_pos_non_zero_ignore - check if firs position is allowed
1971 * @ppos: file position
1972 * @table: the sysctl table
1973 *
1974 * Returns true if the first position is non-zero and the sysctl_writes_strict
1975 * mode indicates this is not allowed for numeric input types. String proc
1976 * hadlers can ignore the return value.
1977 */
1978 static bool proc_first_pos_non_zero_ignore(loff_t *ppos,
1979 struct ctl_table *table)
1980 {
1981 if (!*ppos)
1982 return false;
1983
1984 switch (sysctl_writes_strict) {
1985 case SYSCTL_WRITES_STRICT:
1986 return true;
1987 case SYSCTL_WRITES_WARN:
1988 warn_sysctl_write(table);
1989 return false;
1990 default:
1991 return false;
1992 }
1993 }
1994
1995 /**
1996 * proc_dostring - read a string sysctl
1997 * @table: the sysctl table
1998 * @write: %TRUE if this is a write to the sysctl file
1999 * @buffer: the user buffer
2000 * @lenp: the size of the user buffer
2001 * @ppos: file position
2002 *
2003 * Reads/writes a string from/to the user buffer. If the kernel
2004 * buffer provided is not large enough to hold the string, the
2005 * string is truncated. The copied string is %NULL-terminated.
2006 * If the string is being read by the user process, it is copied
2007 * and a newline '\n' is added. It is truncated if the buffer is
2008 * not large enough.
2009 *
2010 * Returns 0 on success.
2011 */
2012 int proc_dostring(struct ctl_table *table, int write,
2013 void __user *buffer, size_t *lenp, loff_t *ppos)
2014 {
2015 if (write)
2016 proc_first_pos_non_zero_ignore(ppos, table);
2017
2018 return _proc_do_string((char *)(table->data), table->maxlen, write,
2019 (char __user *)buffer, lenp, ppos);
2020 }
2021
2022 static size_t proc_skip_spaces(char **buf)
2023 {
2024 size_t ret;
2025 char *tmp = skip_spaces(*buf);
2026 ret = tmp - *buf;
2027 *buf = tmp;
2028 return ret;
2029 }
2030
2031 static void proc_skip_char(char **buf, size_t *size, const char v)
2032 {
2033 while (*size) {
2034 if (**buf != v)
2035 break;
2036 (*size)--;
2037 (*buf)++;
2038 }
2039 }
2040
2041 #define TMPBUFLEN 22
2042 /**
2043 * proc_get_long - reads an ASCII formatted integer from a user buffer
2044 *
2045 * @buf: a kernel buffer
2046 * @size: size of the kernel buffer
2047 * @val: this is where the number will be stored
2048 * @neg: set to %TRUE if number is negative
2049 * @perm_tr: a vector which contains the allowed trailers
2050 * @perm_tr_len: size of the perm_tr vector
2051 * @tr: pointer to store the trailer character
2052 *
2053 * In case of success %0 is returned and @buf and @size are updated with
2054 * the amount of bytes read. If @tr is non-NULL and a trailing
2055 * character exists (size is non-zero after returning from this
2056 * function), @tr is updated with the trailing character.
2057 */
2058 static int proc_get_long(char **buf, size_t *size,
2059 unsigned long *val, bool *neg,
2060 const char *perm_tr, unsigned perm_tr_len, char *tr)
2061 {
2062 int len;
2063 char *p, tmp[TMPBUFLEN];
2064
2065 if (!*size)
2066 return -EINVAL;
2067
2068 len = *size;
2069 if (len > TMPBUFLEN - 1)
2070 len = TMPBUFLEN - 1;
2071
2072 memcpy(tmp, *buf, len);
2073
2074 tmp[len] = 0;
2075 p = tmp;
2076 if (*p == '-' && *size > 1) {
2077 *neg = true;
2078 p++;
2079 } else
2080 *neg = false;
2081 if (!isdigit(*p))
2082 return -EINVAL;
2083
2084 *val = simple_strtoul(p, &p, 0);
2085
2086 len = p - tmp;
2087
2088 /* We don't know if the next char is whitespace thus we may accept
2089 * invalid integers (e.g. 1234...a) or two integers instead of one
2090 * (e.g. 123...1). So lets not allow such large numbers. */
2091 if (len == TMPBUFLEN - 1)
2092 return -EINVAL;
2093
2094 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
2095 return -EINVAL;
2096
2097 if (tr && (len < *size))
2098 *tr = *p;
2099
2100 *buf += len;
2101 *size -= len;
2102
2103 return 0;
2104 }
2105
2106 /**
2107 * proc_put_long - converts an integer to a decimal ASCII formatted string
2108 *
2109 * @buf: the user buffer
2110 * @size: the size of the user buffer
2111 * @val: the integer to be converted
2112 * @neg: sign of the number, %TRUE for negative
2113 *
2114 * In case of success %0 is returned and @buf and @size are updated with
2115 * the amount of bytes written.
2116 */
2117 static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
2118 bool neg)
2119 {
2120 int len;
2121 char tmp[TMPBUFLEN], *p = tmp;
2122
2123 sprintf(p, "%s%lu", neg ? "-" : "", val);
2124 len = strlen(tmp);
2125 if (len > *size)
2126 len = *size;
2127 if (copy_to_user(*buf, tmp, len))
2128 return -EFAULT;
2129 *size -= len;
2130 *buf += len;
2131 return 0;
2132 }
2133 #undef TMPBUFLEN
2134
2135 static int proc_put_char(void __user **buf, size_t *size, char c)
2136 {
2137 if (*size) {
2138 char __user **buffer = (char __user **)buf;
2139 if (put_user(c, *buffer))
2140 return -EFAULT;
2141 (*size)--, (*buffer)++;
2142 *buf = *buffer;
2143 }
2144 return 0;
2145 }
2146
2147 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
2148 int *valp,
2149 int write, void *data)
2150 {
2151 if (write) {
2152 if (*negp) {
2153 if (*lvalp > (unsigned long) INT_MAX + 1)
2154 return -EINVAL;
2155 *valp = -*lvalp;
2156 } else {
2157 if (*lvalp > (unsigned long) INT_MAX)
2158 return -EINVAL;
2159 *valp = *lvalp;
2160 }
2161 } else {
2162 int val = *valp;
2163 if (val < 0) {
2164 *negp = true;
2165 *lvalp = -(unsigned long)val;
2166 } else {
2167 *negp = false;
2168 *lvalp = (unsigned long)val;
2169 }
2170 }
2171 return 0;
2172 }
2173
2174 static int do_proc_douintvec_conv(unsigned long *lvalp,
2175 unsigned int *valp,
2176 int write, void *data)
2177 {
2178 if (write) {
2179 if (*lvalp > UINT_MAX)
2180 return -EINVAL;
2181 *valp = *lvalp;
2182 } else {
2183 unsigned int val = *valp;
2184 *lvalp = (unsigned long)val;
2185 }
2186 return 0;
2187 }
2188
2189 static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
2190
2191 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
2192 int write, void __user *buffer,
2193 size_t *lenp, loff_t *ppos,
2194 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2195 int write, void *data),
2196 void *data)
2197 {
2198 int *i, vleft, first = 1, err = 0;
2199 size_t left;
2200 char *kbuf = NULL, *p;
2201
2202 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
2203 *lenp = 0;
2204 return 0;
2205 }
2206
2207 i = (int *) tbl_data;
2208 vleft = table->maxlen / sizeof(*i);
2209 left = *lenp;
2210
2211 if (!conv)
2212 conv = do_proc_dointvec_conv;
2213
2214 if (write) {
2215 if (proc_first_pos_non_zero_ignore(ppos, table))
2216 goto out;
2217
2218 if (left > PAGE_SIZE - 1)
2219 left = PAGE_SIZE - 1;
2220 p = kbuf = memdup_user_nul(buffer, left);
2221 if (IS_ERR(kbuf))
2222 return PTR_ERR(kbuf);
2223 }
2224
2225 for (; left && vleft--; i++, first=0) {
2226 unsigned long lval;
2227 bool neg;
2228
2229 if (write) {
2230 left -= proc_skip_spaces(&p);
2231
2232 if (!left)
2233 break;
2234 err = proc_get_long(&p, &left, &lval, &neg,
2235 proc_wspace_sep,
2236 sizeof(proc_wspace_sep), NULL);
2237 if (err)
2238 break;
2239 if (conv(&neg, &lval, i, 1, data)) {
2240 err = -EINVAL;
2241 break;
2242 }
2243 } else {
2244 if (conv(&neg, &lval, i, 0, data)) {
2245 err = -EINVAL;
2246 break;
2247 }
2248 if (!first)
2249 err = proc_put_char(&buffer, &left, '\t');
2250 if (err)
2251 break;
2252 err = proc_put_long(&buffer, &left, lval, neg);
2253 if (err)
2254 break;
2255 }
2256 }
2257
2258 if (!write && !first && left && !err)
2259 err = proc_put_char(&buffer, &left, '\n');
2260 if (write && !err && left)
2261 left -= proc_skip_spaces(&p);
2262 if (write) {
2263 kfree(kbuf);
2264 if (first)
2265 return err ? : -EINVAL;
2266 }
2267 *lenp -= left;
2268 out:
2269 *ppos += *lenp;
2270 return err;
2271 }
2272
2273 static int do_proc_dointvec(struct ctl_table *table, int write,
2274 void __user *buffer, size_t *lenp, loff_t *ppos,
2275 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2276 int write, void *data),
2277 void *data)
2278 {
2279 return __do_proc_dointvec(table->data, table, write,
2280 buffer, lenp, ppos, conv, data);
2281 }
2282
2283 static int do_proc_douintvec_w(unsigned int *tbl_data,
2284 struct ctl_table *table,
2285 void __user *buffer,
2286 size_t *lenp, loff_t *ppos,
2287 int (*conv)(unsigned long *lvalp,
2288 unsigned int *valp,
2289 int write, void *data),
2290 void *data)
2291 {
2292 unsigned long lval;
2293 int err = 0;
2294 size_t left;
2295 bool neg;
2296 char *kbuf = NULL, *p;
2297
2298 left = *lenp;
2299
2300 if (proc_first_pos_non_zero_ignore(ppos, table))
2301 goto bail_early;
2302
2303 if (left > PAGE_SIZE - 1)
2304 left = PAGE_SIZE - 1;
2305
2306 p = kbuf = memdup_user_nul(buffer, left);
2307 if (IS_ERR(kbuf))
2308 return -EINVAL;
2309
2310 left -= proc_skip_spaces(&p);
2311 if (!left) {
2312 err = -EINVAL;
2313 goto out_free;
2314 }
2315
2316 err = proc_get_long(&p, &left, &lval, &neg,
2317 proc_wspace_sep,
2318 sizeof(proc_wspace_sep), NULL);
2319 if (err || neg) {
2320 err = -EINVAL;
2321 goto out_free;
2322 }
2323
2324 if (conv(&lval, tbl_data, 1, data)) {
2325 err = -EINVAL;
2326 goto out_free;
2327 }
2328
2329 if (!err && left)
2330 left -= proc_skip_spaces(&p);
2331
2332 out_free:
2333 kfree(kbuf);
2334 if (err)
2335 return -EINVAL;
2336
2337 return 0;
2338
2339 /* This is in keeping with old __do_proc_dointvec() */
2340 bail_early:
2341 *ppos += *lenp;
2342 return err;
2343 }
2344
2345 static int do_proc_douintvec_r(unsigned int *tbl_data, void __user *buffer,
2346 size_t *lenp, loff_t *ppos,
2347 int (*conv)(unsigned long *lvalp,
2348 unsigned int *valp,
2349 int write, void *data),
2350 void *data)
2351 {
2352 unsigned long lval;
2353 int err = 0;
2354 size_t left;
2355
2356 left = *lenp;
2357
2358 if (conv(&lval, tbl_data, 0, data)) {
2359 err = -EINVAL;
2360 goto out;
2361 }
2362
2363 err = proc_put_long(&buffer, &left, lval, false);
2364 if (err || !left)
2365 goto out;
2366
2367 err = proc_put_char(&buffer, &left, '\n');
2368
2369 out:
2370 *lenp -= left;
2371 *ppos += *lenp;
2372
2373 return err;
2374 }
2375
2376 static int __do_proc_douintvec(void *tbl_data, struct ctl_table *table,
2377 int write, void __user *buffer,
2378 size_t *lenp, loff_t *ppos,
2379 int (*conv)(unsigned long *lvalp,
2380 unsigned int *valp,
2381 int write, void *data),
2382 void *data)
2383 {
2384 unsigned int *i, vleft;
2385
2386 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
2387 *lenp = 0;
2388 return 0;
2389 }
2390
2391 i = (unsigned int *) tbl_data;
2392 vleft = table->maxlen / sizeof(*i);
2393
2394 /*
2395 * Arrays are not supported, keep this simple. *Do not* add
2396 * support for them.
2397 */
2398 if (vleft != 1) {
2399 *lenp = 0;
2400 return -EINVAL;
2401 }
2402
2403 if (!conv)
2404 conv = do_proc_douintvec_conv;
2405
2406 if (write)
2407 return do_proc_douintvec_w(i, table, buffer, lenp, ppos,
2408 conv, data);
2409 return do_proc_douintvec_r(i, buffer, lenp, ppos, conv, data);
2410 }
2411
2412 static int do_proc_douintvec(struct ctl_table *table, int write,
2413 void __user *buffer, size_t *lenp, loff_t *ppos,
2414 int (*conv)(unsigned long *lvalp,
2415 unsigned int *valp,
2416 int write, void *data),
2417 void *data)
2418 {
2419 return __do_proc_douintvec(table->data, table, write,
2420 buffer, lenp, ppos, conv, data);
2421 }
2422
2423 /**
2424 * proc_dointvec - read a vector of integers
2425 * @table: the sysctl table
2426 * @write: %TRUE if this is a write to the sysctl file
2427 * @buffer: the user buffer
2428 * @lenp: the size of the user buffer
2429 * @ppos: file position
2430 *
2431 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2432 * values from/to the user buffer, treated as an ASCII string.
2433 *
2434 * Returns 0 on success.
2435 */
2436 int proc_dointvec(struct ctl_table *table, int write,
2437 void __user *buffer, size_t *lenp, loff_t *ppos)
2438 {
2439 return do_proc_dointvec(table, write, buffer, lenp, ppos, NULL, NULL);
2440 }
2441
2442 /**
2443 * proc_douintvec - read a vector of unsigned integers
2444 * @table: the sysctl table
2445 * @write: %TRUE if this is a write to the sysctl file
2446 * @buffer: the user buffer
2447 * @lenp: the size of the user buffer
2448 * @ppos: file position
2449 *
2450 * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
2451 * values from/to the user buffer, treated as an ASCII string.
2452 *
2453 * Returns 0 on success.
2454 */
2455 int proc_douintvec(struct ctl_table *table, int write,
2456 void __user *buffer, size_t *lenp, loff_t *ppos)
2457 {
2458 return do_proc_douintvec(table, write, buffer, lenp, ppos,
2459 do_proc_douintvec_conv, NULL);
2460 }
2461
2462 /*
2463 * Taint values can only be increased
2464 * This means we can safely use a temporary.
2465 */
2466 static int proc_taint(struct ctl_table *table, int write,
2467 void __user *buffer, size_t *lenp, loff_t *ppos)
2468 {
2469 struct ctl_table t;
2470 unsigned long tmptaint = get_taint();
2471 int err;
2472
2473 if (write && !capable(CAP_SYS_ADMIN))
2474 return -EPERM;
2475
2476 t = *table;
2477 t.data = &tmptaint;
2478 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
2479 if (err < 0)
2480 return err;
2481
2482 if (write) {
2483 /*
2484 * Poor man's atomic or. Not worth adding a primitive
2485 * to everyone's atomic.h for this
2486 */
2487 int i;
2488 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2489 if ((tmptaint >> i) & 1)
2490 add_taint(i, LOCKDEP_STILL_OK);
2491 }
2492 }
2493
2494 return err;
2495 }
2496
2497 #ifdef CONFIG_PRINTK
2498 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
2499 void __user *buffer, size_t *lenp, loff_t *ppos)
2500 {
2501 if (write && !capable(CAP_SYS_ADMIN))
2502 return -EPERM;
2503
2504 return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2505 }
2506 #endif
2507
2508 struct do_proc_dointvec_minmax_conv_param {
2509 int *min;
2510 int *max;
2511 };
2512
2513 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
2514 int *valp,
2515 int write, void *data)
2516 {
2517 struct do_proc_dointvec_minmax_conv_param *param = data;
2518 if (write) {
2519 int val = *negp ? -*lvalp : *lvalp;
2520 if ((param->min && *param->min > val) ||
2521 (param->max && *param->max < val))
2522 return -EINVAL;
2523 *valp = val;
2524 } else {
2525 int val = *valp;
2526 if (val < 0) {
2527 *negp = true;
2528 *lvalp = -(unsigned long)val;
2529 } else {
2530 *negp = false;
2531 *lvalp = (unsigned long)val;
2532 }
2533 }
2534 return 0;
2535 }
2536
2537 /**
2538 * proc_dointvec_minmax - read a vector of integers with min/max values
2539 * @table: the sysctl table
2540 * @write: %TRUE if this is a write to the sysctl file
2541 * @buffer: the user buffer
2542 * @lenp: the size of the user buffer
2543 * @ppos: file position
2544 *
2545 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2546 * values from/to the user buffer, treated as an ASCII string.
2547 *
2548 * This routine will ensure the values are within the range specified by
2549 * table->extra1 (min) and table->extra2 (max).
2550 *
2551 * Returns 0 on success.
2552 */
2553 int proc_dointvec_minmax(struct ctl_table *table, int write,
2554 void __user *buffer, size_t *lenp, loff_t *ppos)
2555 {
2556 struct do_proc_dointvec_minmax_conv_param param = {
2557 .min = (int *) table->extra1,
2558 .max = (int *) table->extra2,
2559 };
2560 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2561 do_proc_dointvec_minmax_conv, &param);
2562 }
2563
2564 struct do_proc_douintvec_minmax_conv_param {
2565 unsigned int *min;
2566 unsigned int *max;
2567 };
2568
2569 static int do_proc_douintvec_minmax_conv(unsigned long *lvalp,
2570 unsigned int *valp,
2571 int write, void *data)
2572 {
2573 struct do_proc_douintvec_minmax_conv_param *param = data;
2574
2575 if (write) {
2576 unsigned int val = *lvalp;
2577
2578 if ((param->min && *param->min > val) ||
2579 (param->max && *param->max < val))
2580 return -ERANGE;
2581
2582 if (*lvalp > UINT_MAX)
2583 return -EINVAL;
2584 *valp = val;
2585 } else {
2586 unsigned int val = *valp;
2587 *lvalp = (unsigned long) val;
2588 }
2589
2590 return 0;
2591 }
2592
2593 /**
2594 * proc_douintvec_minmax - read a vector of unsigned ints with min/max values
2595 * @table: the sysctl table
2596 * @write: %TRUE if this is a write to the sysctl file
2597 * @buffer: the user buffer
2598 * @lenp: the size of the user buffer
2599 * @ppos: file position
2600 *
2601 * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
2602 * values from/to the user buffer, treated as an ASCII string. Negative
2603 * strings are not allowed.
2604 *
2605 * This routine will ensure the values are within the range specified by
2606 * table->extra1 (min) and table->extra2 (max). There is a final sanity
2607 * check for UINT_MAX to avoid having to support wrap around uses from
2608 * userspace.
2609 *
2610 * Returns 0 on success.
2611 */
2612 int proc_douintvec_minmax(struct ctl_table *table, int write,
2613 void __user *buffer, size_t *lenp, loff_t *ppos)
2614 {
2615 struct do_proc_douintvec_minmax_conv_param param = {
2616 .min = (unsigned int *) table->extra1,
2617 .max = (unsigned int *) table->extra2,
2618 };
2619 return do_proc_douintvec(table, write, buffer, lenp, ppos,
2620 do_proc_douintvec_minmax_conv, &param);
2621 }
2622
2623 static void validate_coredump_safety(void)
2624 {
2625 #ifdef CONFIG_COREDUMP
2626 if (suid_dumpable == SUID_DUMP_ROOT &&
2627 core_pattern[0] != '/' && core_pattern[0] != '|') {
2628 printk(KERN_WARNING
2629 "Unsafe core_pattern used with fs.suid_dumpable=2.\n"
2630 "Pipe handler or fully qualified core dump path required.\n"
2631 "Set kernel.core_pattern before fs.suid_dumpable.\n"
2632 );
2633 }
2634 #endif
2635 }
2636
2637 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
2638 void __user *buffer, size_t *lenp, loff_t *ppos)
2639 {
2640 int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2641 if (!error)
2642 validate_coredump_safety();
2643 return error;
2644 }
2645
2646 #ifdef CONFIG_COREDUMP
2647 static int proc_dostring_coredump(struct ctl_table *table, int write,
2648 void __user *buffer, size_t *lenp, loff_t *ppos)
2649 {
2650 int error = proc_dostring(table, write, buffer, lenp, ppos);
2651 if (!error)
2652 validate_coredump_safety();
2653 return error;
2654 }
2655 #endif
2656
2657 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2658 void __user *buffer,
2659 size_t *lenp, loff_t *ppos,
2660 unsigned long convmul,
2661 unsigned long convdiv)
2662 {
2663 unsigned long *i, *min, *max;
2664 int vleft, first = 1, err = 0;
2665 size_t left;
2666 char *kbuf = NULL, *p;
2667
2668 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
2669 *lenp = 0;
2670 return 0;
2671 }
2672
2673 i = (unsigned long *) data;
2674 min = (unsigned long *) table->extra1;
2675 max = (unsigned long *) table->extra2;
2676 vleft = table->maxlen / sizeof(unsigned long);
2677 left = *lenp;
2678
2679 if (write) {
2680 if (proc_first_pos_non_zero_ignore(ppos, table))
2681 goto out;
2682
2683 if (left > PAGE_SIZE - 1)
2684 left = PAGE_SIZE - 1;
2685 p = kbuf = memdup_user_nul(buffer, left);
2686 if (IS_ERR(kbuf))
2687 return PTR_ERR(kbuf);
2688 }
2689
2690 for (; left && vleft--; i++, first = 0) {
2691 unsigned long val;
2692
2693 if (write) {
2694 bool neg;
2695
2696 left -= proc_skip_spaces(&p);
2697
2698 err = proc_get_long(&p, &left, &val, &neg,
2699 proc_wspace_sep,
2700 sizeof(proc_wspace_sep), NULL);
2701 if (err)
2702 break;
2703 if (neg)
2704 continue;
2705 val = convmul * val / convdiv;
2706 if ((min && val < *min) || (max && val > *max))
2707 continue;
2708 *i = val;
2709 } else {
2710 val = convdiv * (*i) / convmul;
2711 if (!first) {
2712 err = proc_put_char(&buffer, &left, '\t');
2713 if (err)
2714 break;
2715 }
2716 err = proc_put_long(&buffer, &left, val, false);
2717 if (err)
2718 break;
2719 }
2720 }
2721
2722 if (!write && !first && left && !err)
2723 err = proc_put_char(&buffer, &left, '\n');
2724 if (write && !err)
2725 left -= proc_skip_spaces(&p);
2726 if (write) {
2727 kfree(kbuf);
2728 if (first)
2729 return err ? : -EINVAL;
2730 }
2731 *lenp -= left;
2732 out:
2733 *ppos += *lenp;
2734 return err;
2735 }
2736
2737 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2738 void __user *buffer,
2739 size_t *lenp, loff_t *ppos,
2740 unsigned long convmul,
2741 unsigned long convdiv)
2742 {
2743 return __do_proc_doulongvec_minmax(table->data, table, write,
2744 buffer, lenp, ppos, convmul, convdiv);
2745 }
2746
2747 /**
2748 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2749 * @table: the sysctl table
2750 * @write: %TRUE if this is a write to the sysctl file
2751 * @buffer: the user buffer
2752 * @lenp: the size of the user buffer
2753 * @ppos: file position
2754 *
2755 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2756 * values from/to the user buffer, treated as an ASCII string.
2757 *
2758 * This routine will ensure the values are within the range specified by
2759 * table->extra1 (min) and table->extra2 (max).
2760 *
2761 * Returns 0 on success.
2762 */
2763 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2764 void __user *buffer, size_t *lenp, loff_t *ppos)
2765 {
2766 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
2767 }
2768
2769 /**
2770 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2771 * @table: the sysctl table
2772 * @write: %TRUE if this is a write to the sysctl file
2773 * @buffer: the user buffer
2774 * @lenp: the size of the user buffer
2775 * @ppos: file position
2776 *
2777 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2778 * values from/to the user buffer, treated as an ASCII string. The values
2779 * are treated as milliseconds, and converted to jiffies when they are stored.
2780 *
2781 * This routine will ensure the values are within the range specified by
2782 * table->extra1 (min) and table->extra2 (max).
2783 *
2784 * Returns 0 on success.
2785 */
2786 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2787 void __user *buffer,
2788 size_t *lenp, loff_t *ppos)
2789 {
2790 return do_proc_doulongvec_minmax(table, write, buffer,
2791 lenp, ppos, HZ, 1000l);
2792 }
2793
2794
2795 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
2796 int *valp,
2797 int write, void *data)
2798 {
2799 if (write) {
2800 if (*lvalp > INT_MAX / HZ)
2801 return 1;
2802 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2803 } else {
2804 int val = *valp;
2805 unsigned long lval;
2806 if (val < 0) {
2807 *negp = true;
2808 lval = -(unsigned long)val;
2809 } else {
2810 *negp = false;
2811 lval = (unsigned long)val;
2812 }
2813 *lvalp = lval / HZ;
2814 }
2815 return 0;
2816 }
2817
2818 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
2819 int *valp,
2820 int write, void *data)
2821 {
2822 if (write) {
2823 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2824 return 1;
2825 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2826 } else {
2827 int val = *valp;
2828 unsigned long lval;
2829 if (val < 0) {
2830 *negp = true;
2831 lval = -(unsigned long)val;
2832 } else {
2833 *negp = false;
2834 lval = (unsigned long)val;
2835 }
2836 *lvalp = jiffies_to_clock_t(lval);
2837 }
2838 return 0;
2839 }
2840
2841 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
2842 int *valp,
2843 int write, void *data)
2844 {
2845 if (write) {
2846 unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2847
2848 if (jif > INT_MAX)
2849 return 1;
2850 *valp = (int)jif;
2851 } else {
2852 int val = *valp;
2853 unsigned long lval;
2854 if (val < 0) {
2855 *negp = true;
2856 lval = -(unsigned long)val;
2857 } else {
2858 *negp = false;
2859 lval = (unsigned long)val;
2860 }
2861 *lvalp = jiffies_to_msecs(lval);
2862 }
2863 return 0;
2864 }
2865
2866 /**
2867 * proc_dointvec_jiffies - read a vector of integers as seconds
2868 * @table: the sysctl table
2869 * @write: %TRUE if this is a write to the sysctl file
2870 * @buffer: the user buffer
2871 * @lenp: the size of the user buffer
2872 * @ppos: file position
2873 *
2874 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2875 * values from/to the user buffer, treated as an ASCII string.
2876 * The values read are assumed to be in seconds, and are converted into
2877 * jiffies.
2878 *
2879 * Returns 0 on success.
2880 */
2881 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2882 void __user *buffer, size_t *lenp, loff_t *ppos)
2883 {
2884 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2885 do_proc_dointvec_jiffies_conv,NULL);
2886 }
2887
2888 /**
2889 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2890 * @table: the sysctl table
2891 * @write: %TRUE if this is a write to the sysctl file
2892 * @buffer: the user buffer
2893 * @lenp: the size of the user buffer
2894 * @ppos: pointer to the file position
2895 *
2896 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2897 * values from/to the user buffer, treated as an ASCII string.
2898 * The values read are assumed to be in 1/USER_HZ seconds, and
2899 * are converted into jiffies.
2900 *
2901 * Returns 0 on success.
2902 */
2903 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2904 void __user *buffer, size_t *lenp, loff_t *ppos)
2905 {
2906 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2907 do_proc_dointvec_userhz_jiffies_conv,NULL);
2908 }
2909
2910 /**
2911 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2912 * @table: the sysctl table
2913 * @write: %TRUE if this is a write to the sysctl file
2914 * @buffer: the user buffer
2915 * @lenp: the size of the user buffer
2916 * @ppos: file position
2917 * @ppos: the current position in the file
2918 *
2919 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2920 * values from/to the user buffer, treated as an ASCII string.
2921 * The values read are assumed to be in 1/1000 seconds, and
2922 * are converted into jiffies.
2923 *
2924 * Returns 0 on success.
2925 */
2926 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2927 void __user *buffer, size_t *lenp, loff_t *ppos)
2928 {
2929 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2930 do_proc_dointvec_ms_jiffies_conv, NULL);
2931 }
2932
2933 static int proc_do_cad_pid(struct ctl_table *table, int write,
2934 void __user *buffer, size_t *lenp, loff_t *ppos)
2935 {
2936 struct pid *new_pid;
2937 pid_t tmp;
2938 int r;
2939
2940 tmp = pid_vnr(cad_pid);
2941
2942 r = __do_proc_dointvec(&tmp, table, write, buffer,
2943 lenp, ppos, NULL, NULL);
2944 if (r || !write)
2945 return r;
2946
2947 new_pid = find_get_pid(tmp);
2948 if (!new_pid)
2949 return -ESRCH;
2950
2951 put_pid(xchg(&cad_pid, new_pid));
2952 return 0;
2953 }
2954
2955 /**
2956 * proc_do_large_bitmap - read/write from/to a large bitmap
2957 * @table: the sysctl table
2958 * @write: %TRUE if this is a write to the sysctl file
2959 * @buffer: the user buffer
2960 * @lenp: the size of the user buffer
2961 * @ppos: file position
2962 *
2963 * The bitmap is stored at table->data and the bitmap length (in bits)
2964 * in table->maxlen.
2965 *
2966 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2967 * large bitmaps may be represented in a compact manner. Writing into
2968 * the file will clear the bitmap then update it with the given input.
2969 *
2970 * Returns 0 on success.
2971 */
2972 int proc_do_large_bitmap(struct ctl_table *table, int write,
2973 void __user *buffer, size_t *lenp, loff_t *ppos)
2974 {
2975 int err = 0;
2976 bool first = 1;
2977 size_t left = *lenp;
2978 unsigned long bitmap_len = table->maxlen;
2979 unsigned long *bitmap = *(unsigned long **) table->data;
2980 unsigned long *tmp_bitmap = NULL;
2981 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
2982
2983 if (!bitmap || !bitmap_len || !left || (*ppos && !write)) {
2984 *lenp = 0;
2985 return 0;
2986 }
2987
2988 if (write) {
2989 char *kbuf, *p;
2990
2991 if (left > PAGE_SIZE - 1)
2992 left = PAGE_SIZE - 1;
2993
2994 p = kbuf = memdup_user_nul(buffer, left);
2995 if (IS_ERR(kbuf))
2996 return PTR_ERR(kbuf);
2997
2998 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long),
2999 GFP_KERNEL);
3000 if (!tmp_bitmap) {
3001 kfree(kbuf);
3002 return -ENOMEM;
3003 }
3004 proc_skip_char(&p, &left, '\n');
3005 while (!err && left) {
3006 unsigned long val_a, val_b;
3007 bool neg;
3008
3009 err = proc_get_long(&p, &left, &val_a, &neg, tr_a,
3010 sizeof(tr_a), &c);
3011 if (err)
3012 break;
3013 if (val_a >= bitmap_len || neg) {
3014 err = -EINVAL;
3015 break;
3016 }
3017
3018 val_b = val_a;
3019 if (left) {
3020 p++;
3021 left--;
3022 }
3023
3024 if (c == '-') {
3025 err = proc_get_long(&p, &left, &val_b,
3026 &neg, tr_b, sizeof(tr_b),
3027 &c);
3028 if (err)
3029 break;
3030 if (val_b >= bitmap_len || neg ||
3031 val_a > val_b) {
3032 err = -EINVAL;
3033 break;
3034 }
3035 if (left) {
3036 p++;
3037 left--;
3038 }
3039 }
3040
3041 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
3042 first = 0;
3043 proc_skip_char(&p, &left, '\n');
3044 }
3045 kfree(kbuf);
3046 } else {
3047 unsigned long bit_a, bit_b = 0;
3048
3049 while (left) {
3050 bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
3051 if (bit_a >= bitmap_len)
3052 break;
3053 bit_b = find_next_zero_bit(bitmap, bitmap_len,
3054 bit_a + 1) - 1;
3055
3056 if (!first) {
3057 err = proc_put_char(&buffer, &left, ',');
3058 if (err)
3059 break;
3060 }
3061 err = proc_put_long(&buffer, &left, bit_a, false);
3062 if (err)
3063 break;
3064 if (bit_a != bit_b) {
3065 err = proc_put_char(&buffer, &left, '-');
3066 if (err)
3067 break;
3068 err = proc_put_long(&buffer, &left, bit_b, false);
3069 if (err)
3070 break;
3071 }
3072
3073 first = 0; bit_b++;
3074 }
3075 if (!err)
3076 err = proc_put_char(&buffer, &left, '\n');
3077 }
3078
3079 if (!err) {
3080 if (write) {
3081 if (*ppos)
3082 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
3083 else
3084 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
3085 }
3086 kfree(tmp_bitmap);
3087 *lenp -= left;
3088 *ppos += *lenp;
3089 return 0;
3090 } else {
3091 kfree(tmp_bitmap);
3092 return err;
3093 }
3094 }
3095
3096 #else /* CONFIG_PROC_SYSCTL */
3097
3098 int proc_dostring(struct ctl_table *table, int write,
3099 void __user *buffer, size_t *lenp, loff_t *ppos)
3100 {
3101 return -ENOSYS;
3102 }
3103
3104 int proc_dointvec(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_douintvec(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_dointvec_minmax(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_douintvec_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_dointvec_jiffies(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_userhz_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_ms_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_doulongvec_minmax(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_ms_jiffies_minmax(struct ctl_table *table, int write,
3153 void __user *buffer,
3154 size_t *lenp, loff_t *ppos)
3155 {
3156 return -ENOSYS;
3157 }
3158
3159
3160 #endif /* CONFIG_PROC_SYSCTL */
3161
3162 /*
3163 * No sense putting this after each symbol definition, twice,
3164 * exception granted :-)
3165 */
3166 EXPORT_SYMBOL(proc_dointvec);
3167 EXPORT_SYMBOL(proc_douintvec);
3168 EXPORT_SYMBOL(proc_dointvec_jiffies);
3169 EXPORT_SYMBOL(proc_dointvec_minmax);
3170 EXPORT_SYMBOL_GPL(proc_douintvec_minmax);
3171 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
3172 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
3173 EXPORT_SYMBOL(proc_dostring);
3174 EXPORT_SYMBOL(proc_doulongvec_minmax);
3175 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
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