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Linux 4.14.109
[linux/fpc-iii.git] / kernel / sysctl.c
bloba7acb058b776b10585cb6c2b789afe34d56a32c3
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 = "nr_pdflush_threads",
1336 .mode = 0444 /* read-only */,
1337 .proc_handler = pdflush_proc_obsolete,
1338 },
1339 {
1340 .procname = "swappiness",
1341 .data = &vm_swappiness,
1342 .maxlen = sizeof(vm_swappiness),
1343 .mode = 0644,
1344 .proc_handler = proc_dointvec_minmax,
1345 .extra1 = &zero,
1346 .extra2 = &one_hundred,
1347 },
1348 #ifdef CONFIG_HUGETLB_PAGE
1349 {
1350 .procname = "nr_hugepages",
1351 .data = NULL,
1352 .maxlen = sizeof(unsigned long),
1353 .mode = 0644,
1354 .proc_handler = hugetlb_sysctl_handler,
1355 },
1356 #ifdef CONFIG_NUMA
1357 {
1358 .procname = "nr_hugepages_mempolicy",
1359 .data = NULL,
1360 .maxlen = sizeof(unsigned long),
1361 .mode = 0644,
1362 .proc_handler = &hugetlb_mempolicy_sysctl_handler,
1363 },
1364 #endif
1365 {
1366 .procname = "hugetlb_shm_group",
1367 .data = &sysctl_hugetlb_shm_group,
1368 .maxlen = sizeof(gid_t),
1369 .mode = 0644,
1370 .proc_handler = proc_dointvec,
1371 },
1372 {
1373 .procname = "hugepages_treat_as_movable",
1374 .data = &hugepages_treat_as_movable,
1375 .maxlen = sizeof(int),
1376 .mode = 0644,
1377 .proc_handler = proc_dointvec,
1378 },
1379 {
1380 .procname = "nr_overcommit_hugepages",
1381 .data = NULL,
1382 .maxlen = sizeof(unsigned long),
1383 .mode = 0644,
1384 .proc_handler = hugetlb_overcommit_handler,
1385 },
1386 #endif
1387 {
1388 .procname = "lowmem_reserve_ratio",
1389 .data = &sysctl_lowmem_reserve_ratio,
1390 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1391 .mode = 0644,
1392 .proc_handler = lowmem_reserve_ratio_sysctl_handler,
1393 },
1394 {
1395 .procname = "drop_caches",
1396 .data = &sysctl_drop_caches,
1397 .maxlen = sizeof(int),
1398 .mode = 0644,
1399 .proc_handler = drop_caches_sysctl_handler,
1400 .extra1 = &one,
1401 .extra2 = &four,
1402 },
1403 #ifdef CONFIG_COMPACTION
1404 {
1405 .procname = "compact_memory",
1406 .data = &sysctl_compact_memory,
1407 .maxlen = sizeof(int),
1408 .mode = 0200,
1409 .proc_handler = sysctl_compaction_handler,
1410 },
1411 {
1412 .procname = "extfrag_threshold",
1413 .data = &sysctl_extfrag_threshold,
1414 .maxlen = sizeof(int),
1415 .mode = 0644,
1416 .proc_handler = sysctl_extfrag_handler,
1417 .extra1 = &min_extfrag_threshold,
1418 .extra2 = &max_extfrag_threshold,
1419 },
1420 {
1421 .procname = "compact_unevictable_allowed",
1422 .data = &sysctl_compact_unevictable_allowed,
1423 .maxlen = sizeof(int),
1424 .mode = 0644,
1425 .proc_handler = proc_dointvec,
1426 .extra1 = &zero,
1427 .extra2 = &one,
1428 },
1429
1430 #endif /* CONFIG_COMPACTION */
1431 {
1432 .procname = "min_free_kbytes",
1433 .data = &min_free_kbytes,
1434 .maxlen = sizeof(min_free_kbytes),
1435 .mode = 0644,
1436 .proc_handler = min_free_kbytes_sysctl_handler,
1437 .extra1 = &zero,
1438 },
1439 {
1440 .procname = "watermark_scale_factor",
1441 .data = &watermark_scale_factor,
1442 .maxlen = sizeof(watermark_scale_factor),
1443 .mode = 0644,
1444 .proc_handler = watermark_scale_factor_sysctl_handler,
1445 .extra1 = &one,
1446 .extra2 = &one_thousand,
1447 },
1448 {
1449 .procname = "percpu_pagelist_fraction",
1450 .data = &percpu_pagelist_fraction,
1451 .maxlen = sizeof(percpu_pagelist_fraction),
1452 .mode = 0644,
1453 .proc_handler = percpu_pagelist_fraction_sysctl_handler,
1454 .extra1 = &zero,
1455 },
1456 #ifdef CONFIG_MMU
1457 {
1458 .procname = "max_map_count",
1459 .data = &sysctl_max_map_count,
1460 .maxlen = sizeof(sysctl_max_map_count),
1461 .mode = 0644,
1462 .proc_handler = proc_dointvec_minmax,
1463 .extra1 = &zero,
1464 },
1465 #else
1466 {
1467 .procname = "nr_trim_pages",
1468 .data = &sysctl_nr_trim_pages,
1469 .maxlen = sizeof(sysctl_nr_trim_pages),
1470 .mode = 0644,
1471 .proc_handler = proc_dointvec_minmax,
1472 .extra1 = &zero,
1473 },
1474 #endif
1475 {
1476 .procname = "laptop_mode",
1477 .data = &laptop_mode,
1478 .maxlen = sizeof(laptop_mode),
1479 .mode = 0644,
1480 .proc_handler = proc_dointvec_jiffies,
1481 },
1482 {
1483 .procname = "block_dump",
1484 .data = &block_dump,
1485 .maxlen = sizeof(block_dump),
1486 .mode = 0644,
1487 .proc_handler = proc_dointvec,
1488 .extra1 = &zero,
1489 },
1490 {
1491 .procname = "vfs_cache_pressure",
1492 .data = &sysctl_vfs_cache_pressure,
1493 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1494 .mode = 0644,
1495 .proc_handler = proc_dointvec,
1496 .extra1 = &zero,
1497 },
1498 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1499 {
1500 .procname = "legacy_va_layout",
1501 .data = &sysctl_legacy_va_layout,
1502 .maxlen = sizeof(sysctl_legacy_va_layout),
1503 .mode = 0644,
1504 .proc_handler = proc_dointvec,
1505 .extra1 = &zero,
1506 },
1507 #endif
1508 #ifdef CONFIG_NUMA
1509 {
1510 .procname = "zone_reclaim_mode",
1511 .data = &node_reclaim_mode,
1512 .maxlen = sizeof(node_reclaim_mode),
1513 .mode = 0644,
1514 .proc_handler = proc_dointvec,
1515 .extra1 = &zero,
1516 },
1517 {
1518 .procname = "min_unmapped_ratio",
1519 .data = &sysctl_min_unmapped_ratio,
1520 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1521 .mode = 0644,
1522 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler,
1523 .extra1 = &zero,
1524 .extra2 = &one_hundred,
1525 },
1526 {
1527 .procname = "min_slab_ratio",
1528 .data = &sysctl_min_slab_ratio,
1529 .maxlen = sizeof(sysctl_min_slab_ratio),
1530 .mode = 0644,
1531 .proc_handler = sysctl_min_slab_ratio_sysctl_handler,
1532 .extra1 = &zero,
1533 .extra2 = &one_hundred,
1534 },
1535 #endif
1536 #ifdef CONFIG_SMP
1537 {
1538 .procname = "stat_interval",
1539 .data = &sysctl_stat_interval,
1540 .maxlen = sizeof(sysctl_stat_interval),
1541 .mode = 0644,
1542 .proc_handler = proc_dointvec_jiffies,
1543 },
1544 {
1545 .procname = "stat_refresh",
1546 .data = NULL,
1547 .maxlen = 0,
1548 .mode = 0600,
1549 .proc_handler = vmstat_refresh,
1550 },
1551 #endif
1552 #ifdef CONFIG_MMU
1553 {
1554 .procname = "mmap_min_addr",
1555 .data = &dac_mmap_min_addr,
1556 .maxlen = sizeof(unsigned long),
1557 .mode = 0644,
1558 .proc_handler = mmap_min_addr_handler,
1559 },
1560 #endif
1561 #ifdef CONFIG_NUMA
1562 {
1563 .procname = "numa_zonelist_order",
1564 .data = &numa_zonelist_order,
1565 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1566 .mode = 0644,
1567 .proc_handler = numa_zonelist_order_handler,
1568 },
1569 #endif
1570 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1571 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1572 {
1573 .procname = "vdso_enabled",
1574 #ifdef CONFIG_X86_32
1575 .data = &vdso32_enabled,
1576 .maxlen = sizeof(vdso32_enabled),
1577 #else
1578 .data = &vdso_enabled,
1579 .maxlen = sizeof(vdso_enabled),
1580 #endif
1581 .mode = 0644,
1582 .proc_handler = proc_dointvec,
1583 .extra1 = &zero,
1584 },
1585 #endif
1586 #ifdef CONFIG_HIGHMEM
1587 {
1588 .procname = "highmem_is_dirtyable",
1589 .data = &vm_highmem_is_dirtyable,
1590 .maxlen = sizeof(vm_highmem_is_dirtyable),
1591 .mode = 0644,
1592 .proc_handler = proc_dointvec_minmax,
1593 .extra1 = &zero,
1594 .extra2 = &one,
1595 },
1596 #endif
1597 #ifdef CONFIG_MEMORY_FAILURE
1598 {
1599 .procname = "memory_failure_early_kill",
1600 .data = &sysctl_memory_failure_early_kill,
1601 .maxlen = sizeof(sysctl_memory_failure_early_kill),
1602 .mode = 0644,
1603 .proc_handler = proc_dointvec_minmax,
1604 .extra1 = &zero,
1605 .extra2 = &one,
1606 },
1607 {
1608 .procname = "memory_failure_recovery",
1609 .data = &sysctl_memory_failure_recovery,
1610 .maxlen = sizeof(sysctl_memory_failure_recovery),
1611 .mode = 0644,
1612 .proc_handler = proc_dointvec_minmax,
1613 .extra1 = &zero,
1614 .extra2 = &one,
1615 },
1616 #endif
1617 {
1618 .procname = "user_reserve_kbytes",
1619 .data = &sysctl_user_reserve_kbytes,
1620 .maxlen = sizeof(sysctl_user_reserve_kbytes),
1621 .mode = 0644,
1622 .proc_handler = proc_doulongvec_minmax,
1623 },
1624 {
1625 .procname = "admin_reserve_kbytes",
1626 .data = &sysctl_admin_reserve_kbytes,
1627 .maxlen = sizeof(sysctl_admin_reserve_kbytes),
1628 .mode = 0644,
1629 .proc_handler = proc_doulongvec_minmax,
1630 },
1631 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS
1632 {
1633 .procname = "mmap_rnd_bits",
1634 .data = &mmap_rnd_bits,
1635 .maxlen = sizeof(mmap_rnd_bits),
1636 .mode = 0600,
1637 .proc_handler = proc_dointvec_minmax,
1638 .extra1 = (void *)&mmap_rnd_bits_min,
1639 .extra2 = (void *)&mmap_rnd_bits_max,
1640 },
1641 #endif
1642 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS
1643 {
1644 .procname = "mmap_rnd_compat_bits",
1645 .data = &mmap_rnd_compat_bits,
1646 .maxlen = sizeof(mmap_rnd_compat_bits),
1647 .mode = 0600,
1648 .proc_handler = proc_dointvec_minmax,
1649 .extra1 = (void *)&mmap_rnd_compat_bits_min,
1650 .extra2 = (void *)&mmap_rnd_compat_bits_max,
1651 },
1652 #endif
1653 { }
1654 };
1655
1656 static struct ctl_table fs_table[] = {
1657 {
1658 .procname = "inode-nr",
1659 .data = &inodes_stat,
1660 .maxlen = 2*sizeof(long),
1661 .mode = 0444,
1662 .proc_handler = proc_nr_inodes,
1663 },
1664 {
1665 .procname = "inode-state",
1666 .data = &inodes_stat,
1667 .maxlen = 7*sizeof(long),
1668 .mode = 0444,
1669 .proc_handler = proc_nr_inodes,
1670 },
1671 {
1672 .procname = "file-nr",
1673 .data = &files_stat,
1674 .maxlen = sizeof(files_stat),
1675 .mode = 0444,
1676 .proc_handler = proc_nr_files,
1677 },
1678 {
1679 .procname = "file-max",
1680 .data = &files_stat.max_files,
1681 .maxlen = sizeof(files_stat.max_files),
1682 .mode = 0644,
1683 .proc_handler = proc_doulongvec_minmax,
1684 },
1685 {
1686 .procname = "nr_open",
1687 .data = &sysctl_nr_open,
1688 .maxlen = sizeof(unsigned int),
1689 .mode = 0644,
1690 .proc_handler = proc_dointvec_minmax,
1691 .extra1 = &sysctl_nr_open_min,
1692 .extra2 = &sysctl_nr_open_max,
1693 },
1694 {
1695 .procname = "dentry-state",
1696 .data = &dentry_stat,
1697 .maxlen = 6*sizeof(long),
1698 .mode = 0444,
1699 .proc_handler = proc_nr_dentry,
1700 },
1701 {
1702 .procname = "overflowuid",
1703 .data = &fs_overflowuid,
1704 .maxlen = sizeof(int),
1705 .mode = 0644,
1706 .proc_handler = proc_dointvec_minmax,
1707 .extra1 = &minolduid,
1708 .extra2 = &maxolduid,
1709 },
1710 {
1711 .procname = "overflowgid",
1712 .data = &fs_overflowgid,
1713 .maxlen = sizeof(int),
1714 .mode = 0644,
1715 .proc_handler = proc_dointvec_minmax,
1716 .extra1 = &minolduid,
1717 .extra2 = &maxolduid,
1718 },
1719 #ifdef CONFIG_FILE_LOCKING
1720 {
1721 .procname = "leases-enable",
1722 .data = &leases_enable,
1723 .maxlen = sizeof(int),
1724 .mode = 0644,
1725 .proc_handler = proc_dointvec,
1726 },
1727 #endif
1728 #ifdef CONFIG_DNOTIFY
1729 {
1730 .procname = "dir-notify-enable",
1731 .data = &dir_notify_enable,
1732 .maxlen = sizeof(int),
1733 .mode = 0644,
1734 .proc_handler = proc_dointvec,
1735 },
1736 #endif
1737 #ifdef CONFIG_MMU
1738 #ifdef CONFIG_FILE_LOCKING
1739 {
1740 .procname = "lease-break-time",
1741 .data = &lease_break_time,
1742 .maxlen = sizeof(int),
1743 .mode = 0644,
1744 .proc_handler = proc_dointvec,
1745 },
1746 #endif
1747 #ifdef CONFIG_AIO
1748 {
1749 .procname = "aio-nr",
1750 .data = &aio_nr,
1751 .maxlen = sizeof(aio_nr),
1752 .mode = 0444,
1753 .proc_handler = proc_doulongvec_minmax,
1754 },
1755 {
1756 .procname = "aio-max-nr",
1757 .data = &aio_max_nr,
1758 .maxlen = sizeof(aio_max_nr),
1759 .mode = 0644,
1760 .proc_handler = proc_doulongvec_minmax,
1761 },
1762 #endif /* CONFIG_AIO */
1763 #ifdef CONFIG_INOTIFY_USER
1764 {
1765 .procname = "inotify",
1766 .mode = 0555,
1767 .child = inotify_table,
1768 },
1769 #endif
1770 #ifdef CONFIG_EPOLL
1771 {
1772 .procname = "epoll",
1773 .mode = 0555,
1774 .child = epoll_table,
1775 },
1776 #endif
1777 #endif
1778 {
1779 .procname = "protected_symlinks",
1780 .data = &sysctl_protected_symlinks,
1781 .maxlen = sizeof(int),
1782 .mode = 0600,
1783 .proc_handler = proc_dointvec_minmax,
1784 .extra1 = &zero,
1785 .extra2 = &one,
1786 },
1787 {
1788 .procname = "protected_hardlinks",
1789 .data = &sysctl_protected_hardlinks,
1790 .maxlen = sizeof(int),
1791 .mode = 0600,
1792 .proc_handler = proc_dointvec_minmax,
1793 .extra1 = &zero,
1794 .extra2 = &one,
1795 },
1796 {
1797 .procname = "protected_fifos",
1798 .data = &sysctl_protected_fifos,
1799 .maxlen = sizeof(int),
1800 .mode = 0600,
1801 .proc_handler = proc_dointvec_minmax,
1802 .extra1 = &zero,
1803 .extra2 = &two,
1804 },
1805 {
1806 .procname = "protected_regular",
1807 .data = &sysctl_protected_regular,
1808 .maxlen = sizeof(int),
1809 .mode = 0600,
1810 .proc_handler = proc_dointvec_minmax,
1811 .extra1 = &zero,
1812 .extra2 = &two,
1813 },
1814 {
1815 .procname = "suid_dumpable",
1816 .data = &suid_dumpable,
1817 .maxlen = sizeof(int),
1818 .mode = 0644,
1819 .proc_handler = proc_dointvec_minmax_coredump,
1820 .extra1 = &zero,
1821 .extra2 = &two,
1822 },
1823 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1824 {
1825 .procname = "binfmt_misc",
1826 .mode = 0555,
1827 .child = sysctl_mount_point,
1828 },
1829 #endif
1830 {
1831 .procname = "pipe-max-size",
1832 .data = &pipe_max_size,
1833 .maxlen = sizeof(pipe_max_size),
1834 .mode = 0644,
1835 .proc_handler = &pipe_proc_fn,
1836 .extra1 = &pipe_min_size,
1837 },
1838 {
1839 .procname = "pipe-user-pages-hard",
1840 .data = &pipe_user_pages_hard,
1841 .maxlen = sizeof(pipe_user_pages_hard),
1842 .mode = 0644,
1843 .proc_handler = proc_doulongvec_minmax,
1844 },
1845 {
1846 .procname = "pipe-user-pages-soft",
1847 .data = &pipe_user_pages_soft,
1848 .maxlen = sizeof(pipe_user_pages_soft),
1849 .mode = 0644,
1850 .proc_handler = proc_doulongvec_minmax,
1851 },
1852 {
1853 .procname = "mount-max",
1854 .data = &sysctl_mount_max,
1855 .maxlen = sizeof(unsigned int),
1856 .mode = 0644,
1857 .proc_handler = proc_dointvec_minmax,
1858 .extra1 = &one,
1859 },
1860 { }
1861 };
1862
1863 static struct ctl_table debug_table[] = {
1864 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
1865 {
1866 .procname = "exception-trace",
1867 .data = &show_unhandled_signals,
1868 .maxlen = sizeof(int),
1869 .mode = 0644,
1870 .proc_handler = proc_dointvec
1871 },
1872 #endif
1873 #if defined(CONFIG_OPTPROBES)
1874 {
1875 .procname = "kprobes-optimization",
1876 .data = &sysctl_kprobes_optimization,
1877 .maxlen = sizeof(int),
1878 .mode = 0644,
1879 .proc_handler = proc_kprobes_optimization_handler,
1880 .extra1 = &zero,
1881 .extra2 = &one,
1882 },
1883 #endif
1884 { }
1885 };
1886
1887 static struct ctl_table dev_table[] = {
1888 { }
1889 };
1890
1891 int __init sysctl_init(void)
1892 {
1893 struct ctl_table_header *hdr;
1894
1895 hdr = register_sysctl_table(sysctl_base_table);
1896 kmemleak_not_leak(hdr);
1897 return 0;
1898 }
1899
1900 #endif /* CONFIG_SYSCTL */
1901
1902 /*
1903 * /proc/sys support
1904 */
1905
1906 #ifdef CONFIG_PROC_SYSCTL
1907
1908 static int _proc_do_string(char *data, int maxlen, int write,
1909 char __user *buffer,
1910 size_t *lenp, loff_t *ppos)
1911 {
1912 size_t len;
1913 char __user *p;
1914 char c;
1915
1916 if (!data || !maxlen || !*lenp) {
1917 *lenp = 0;
1918 return 0;
1919 }
1920
1921 if (write) {
1922 if (sysctl_writes_strict == SYSCTL_WRITES_STRICT) {
1923 /* Only continue writes not past the end of buffer. */
1924 len = strlen(data);
1925 if (len > maxlen - 1)
1926 len = maxlen - 1;
1927
1928 if (*ppos > len)
1929 return 0;
1930 len = *ppos;
1931 } else {
1932 /* Start writing from beginning of buffer. */
1933 len = 0;
1934 }
1935
1936 *ppos += *lenp;
1937 p = buffer;
1938 while ((p - buffer) < *lenp && len < maxlen - 1) {
1939 if (get_user(c, p++))
1940 return -EFAULT;
1941 if (c == 0 || c == '\n')
1942 break;
1943 data[len++] = c;
1944 }
1945 data[len] = 0;
1946 } else {
1947 len = strlen(data);
1948 if (len > maxlen)
1949 len = maxlen;
1950
1951 if (*ppos > len) {
1952 *lenp = 0;
1953 return 0;
1954 }
1955
1956 data += *ppos;
1957 len -= *ppos;
1958
1959 if (len > *lenp)
1960 len = *lenp;
1961 if (len)
1962 if (copy_to_user(buffer, data, len))
1963 return -EFAULT;
1964 if (len < *lenp) {
1965 if (put_user('\n', buffer + len))
1966 return -EFAULT;
1967 len++;
1968 }
1969 *lenp = len;
1970 *ppos += len;
1971 }
1972 return 0;
1973 }
1974
1975 static void warn_sysctl_write(struct ctl_table *table)
1976 {
1977 pr_warn_once("%s wrote to %s when file position was not 0!\n"
1978 "This will not be supported in the future. To silence this\n"
1979 "warning, set kernel.sysctl_writes_strict = -1\n",
1980 current->comm, table->procname);
1981 }
1982
1983 /**
1984 * proc_first_pos_non_zero_ignore - check if firs position is allowed
1985 * @ppos: file position
1986 * @table: the sysctl table
1987 *
1988 * Returns true if the first position is non-zero and the sysctl_writes_strict
1989 * mode indicates this is not allowed for numeric input types. String proc
1990 * hadlers can ignore the return value.
1991 */
1992 static bool proc_first_pos_non_zero_ignore(loff_t *ppos,
1993 struct ctl_table *table)
1994 {
1995 if (!*ppos)
1996 return false;
1997
1998 switch (sysctl_writes_strict) {
1999 case SYSCTL_WRITES_STRICT:
2000 return true;
2001 case SYSCTL_WRITES_WARN:
2002 warn_sysctl_write(table);
2003 return false;
2004 default:
2005 return false;
2006 }
2007 }
2008
2009 /**
2010 * proc_dostring - read a string sysctl
2011 * @table: the sysctl table
2012 * @write: %TRUE if this is a write to the sysctl file
2013 * @buffer: the user buffer
2014 * @lenp: the size of the user buffer
2015 * @ppos: file position
2016 *
2017 * Reads/writes a string from/to the user buffer. If the kernel
2018 * buffer provided is not large enough to hold the string, the
2019 * string is truncated. The copied string is %NULL-terminated.
2020 * If the string is being read by the user process, it is copied
2021 * and a newline '\n' is added. It is truncated if the buffer is
2022 * not large enough.
2023 *
2024 * Returns 0 on success.
2025 */
2026 int proc_dostring(struct ctl_table *table, int write,
2027 void __user *buffer, size_t *lenp, loff_t *ppos)
2028 {
2029 if (write)
2030 proc_first_pos_non_zero_ignore(ppos, table);
2031
2032 return _proc_do_string((char *)(table->data), table->maxlen, write,
2033 (char __user *)buffer, lenp, ppos);
2034 }
2035
2036 static size_t proc_skip_spaces(char **buf)
2037 {
2038 size_t ret;
2039 char *tmp = skip_spaces(*buf);
2040 ret = tmp - *buf;
2041 *buf = tmp;
2042 return ret;
2043 }
2044
2045 static void proc_skip_char(char **buf, size_t *size, const char v)
2046 {
2047 while (*size) {
2048 if (**buf != v)
2049 break;
2050 (*size)--;
2051 (*buf)++;
2052 }
2053 }
2054
2055 #define TMPBUFLEN 22
2056 /**
2057 * proc_get_long - reads an ASCII formatted integer from a user buffer
2058 *
2059 * @buf: a kernel buffer
2060 * @size: size of the kernel buffer
2061 * @val: this is where the number will be stored
2062 * @neg: set to %TRUE if number is negative
2063 * @perm_tr: a vector which contains the allowed trailers
2064 * @perm_tr_len: size of the perm_tr vector
2065 * @tr: pointer to store the trailer character
2066 *
2067 * In case of success %0 is returned and @buf and @size are updated with
2068 * the amount of bytes read. If @tr is non-NULL and a trailing
2069 * character exists (size is non-zero after returning from this
2070 * function), @tr is updated with the trailing character.
2071 */
2072 static int proc_get_long(char **buf, size_t *size,
2073 unsigned long *val, bool *neg,
2074 const char *perm_tr, unsigned perm_tr_len, char *tr)
2075 {
2076 int len;
2077 char *p, tmp[TMPBUFLEN];
2078
2079 if (!*size)
2080 return -EINVAL;
2081
2082 len = *size;
2083 if (len > TMPBUFLEN - 1)
2084 len = TMPBUFLEN - 1;
2085
2086 memcpy(tmp, *buf, len);
2087
2088 tmp[len] = 0;
2089 p = tmp;
2090 if (*p == '-' && *size > 1) {
2091 *neg = true;
2092 p++;
2093 } else
2094 *neg = false;
2095 if (!isdigit(*p))
2096 return -EINVAL;
2097
2098 *val = simple_strtoul(p, &p, 0);
2099
2100 len = p - tmp;
2101
2102 /* We don't know if the next char is whitespace thus we may accept
2103 * invalid integers (e.g. 1234...a) or two integers instead of one
2104 * (e.g. 123...1). So lets not allow such large numbers. */
2105 if (len == TMPBUFLEN - 1)
2106 return -EINVAL;
2107
2108 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
2109 return -EINVAL;
2110
2111 if (tr && (len < *size))
2112 *tr = *p;
2113
2114 *buf += len;
2115 *size -= len;
2116
2117 return 0;
2118 }
2119
2120 /**
2121 * proc_put_long - converts an integer to a decimal ASCII formatted string
2122 *
2123 * @buf: the user buffer
2124 * @size: the size of the user buffer
2125 * @val: the integer to be converted
2126 * @neg: sign of the number, %TRUE for negative
2127 *
2128 * In case of success %0 is returned and @buf and @size are updated with
2129 * the amount of bytes written.
2130 */
2131 static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
2132 bool neg)
2133 {
2134 int len;
2135 char tmp[TMPBUFLEN], *p = tmp;
2136
2137 sprintf(p, "%s%lu", neg ? "-" : "", val);
2138 len = strlen(tmp);
2139 if (len > *size)
2140 len = *size;
2141 if (copy_to_user(*buf, tmp, len))
2142 return -EFAULT;
2143 *size -= len;
2144 *buf += len;
2145 return 0;
2146 }
2147 #undef TMPBUFLEN
2148
2149 static int proc_put_char(void __user **buf, size_t *size, char c)
2150 {
2151 if (*size) {
2152 char __user **buffer = (char __user **)buf;
2153 if (put_user(c, *buffer))
2154 return -EFAULT;
2155 (*size)--, (*buffer)++;
2156 *buf = *buffer;
2157 }
2158 return 0;
2159 }
2160
2161 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
2162 int *valp,
2163 int write, void *data)
2164 {
2165 if (write) {
2166 if (*negp) {
2167 if (*lvalp > (unsigned long) INT_MAX + 1)
2168 return -EINVAL;
2169 *valp = -*lvalp;
2170 } else {
2171 if (*lvalp > (unsigned long) INT_MAX)
2172 return -EINVAL;
2173 *valp = *lvalp;
2174 }
2175 } else {
2176 int val = *valp;
2177 if (val < 0) {
2178 *negp = true;
2179 *lvalp = -(unsigned long)val;
2180 } else {
2181 *negp = false;
2182 *lvalp = (unsigned long)val;
2183 }
2184 }
2185 return 0;
2186 }
2187
2188 static int do_proc_douintvec_conv(unsigned long *lvalp,
2189 unsigned int *valp,
2190 int write, void *data)
2191 {
2192 if (write) {
2193 if (*lvalp > UINT_MAX)
2194 return -EINVAL;
2195 *valp = *lvalp;
2196 } else {
2197 unsigned int val = *valp;
2198 *lvalp = (unsigned long)val;
2199 }
2200 return 0;
2201 }
2202
2203 static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
2204
2205 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
2206 int write, void __user *buffer,
2207 size_t *lenp, loff_t *ppos,
2208 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2209 int write, void *data),
2210 void *data)
2211 {
2212 int *i, vleft, first = 1, err = 0;
2213 size_t left;
2214 char *kbuf = NULL, *p;
2215
2216 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
2217 *lenp = 0;
2218 return 0;
2219 }
2220
2221 i = (int *) tbl_data;
2222 vleft = table->maxlen / sizeof(*i);
2223 left = *lenp;
2224
2225 if (!conv)
2226 conv = do_proc_dointvec_conv;
2227
2228 if (write) {
2229 if (proc_first_pos_non_zero_ignore(ppos, table))
2230 goto out;
2231
2232 if (left > PAGE_SIZE - 1)
2233 left = PAGE_SIZE - 1;
2234 p = kbuf = memdup_user_nul(buffer, left);
2235 if (IS_ERR(kbuf))
2236 return PTR_ERR(kbuf);
2237 }
2238
2239 for (; left && vleft--; i++, first=0) {
2240 unsigned long lval;
2241 bool neg;
2242
2243 if (write) {
2244 left -= proc_skip_spaces(&p);
2245
2246 if (!left)
2247 break;
2248 err = proc_get_long(&p, &left, &lval, &neg,
2249 proc_wspace_sep,
2250 sizeof(proc_wspace_sep), NULL);
2251 if (err)
2252 break;
2253 if (conv(&neg, &lval, i, 1, data)) {
2254 err = -EINVAL;
2255 break;
2256 }
2257 } else {
2258 if (conv(&neg, &lval, i, 0, data)) {
2259 err = -EINVAL;
2260 break;
2261 }
2262 if (!first)
2263 err = proc_put_char(&buffer, &left, '\t');
2264 if (err)
2265 break;
2266 err = proc_put_long(&buffer, &left, lval, neg);
2267 if (err)
2268 break;
2269 }
2270 }
2271
2272 if (!write && !first && left && !err)
2273 err = proc_put_char(&buffer, &left, '\n');
2274 if (write && !err && left)
2275 left -= proc_skip_spaces(&p);
2276 if (write) {
2277 kfree(kbuf);
2278 if (first)
2279 return err ? : -EINVAL;
2280 }
2281 *lenp -= left;
2282 out:
2283 *ppos += *lenp;
2284 return err;
2285 }
2286
2287 static int do_proc_dointvec(struct ctl_table *table, int write,
2288 void __user *buffer, size_t *lenp, loff_t *ppos,
2289 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2290 int write, void *data),
2291 void *data)
2292 {
2293 return __do_proc_dointvec(table->data, table, write,
2294 buffer, lenp, ppos, conv, data);
2295 }
2296
2297 static int do_proc_douintvec_w(unsigned int *tbl_data,
2298 struct ctl_table *table,
2299 void __user *buffer,
2300 size_t *lenp, loff_t *ppos,
2301 int (*conv)(unsigned long *lvalp,
2302 unsigned int *valp,
2303 int write, void *data),
2304 void *data)
2305 {
2306 unsigned long lval;
2307 int err = 0;
2308 size_t left;
2309 bool neg;
2310 char *kbuf = NULL, *p;
2311
2312 left = *lenp;
2313
2314 if (proc_first_pos_non_zero_ignore(ppos, table))
2315 goto bail_early;
2316
2317 if (left > PAGE_SIZE - 1)
2318 left = PAGE_SIZE - 1;
2319
2320 p = kbuf = memdup_user_nul(buffer, left);
2321 if (IS_ERR(kbuf))
2322 return -EINVAL;
2323
2324 left -= proc_skip_spaces(&p);
2325 if (!left) {
2326 err = -EINVAL;
2327 goto out_free;
2328 }
2329
2330 err = proc_get_long(&p, &left, &lval, &neg,
2331 proc_wspace_sep,
2332 sizeof(proc_wspace_sep), NULL);
2333 if (err || neg) {
2334 err = -EINVAL;
2335 goto out_free;
2336 }
2337
2338 if (conv(&lval, tbl_data, 1, data)) {
2339 err = -EINVAL;
2340 goto out_free;
2341 }
2342
2343 if (!err && left)
2344 left -= proc_skip_spaces(&p);
2345
2346 out_free:
2347 kfree(kbuf);
2348 if (err)
2349 return -EINVAL;
2350
2351 return 0;
2352
2353 /* This is in keeping with old __do_proc_dointvec() */
2354 bail_early:
2355 *ppos += *lenp;
2356 return err;
2357 }
2358
2359 static int do_proc_douintvec_r(unsigned int *tbl_data, void __user *buffer,
2360 size_t *lenp, loff_t *ppos,
2361 int (*conv)(unsigned long *lvalp,
2362 unsigned int *valp,
2363 int write, void *data),
2364 void *data)
2365 {
2366 unsigned long lval;
2367 int err = 0;
2368 size_t left;
2369
2370 left = *lenp;
2371
2372 if (conv(&lval, tbl_data, 0, data)) {
2373 err = -EINVAL;
2374 goto out;
2375 }
2376
2377 err = proc_put_long(&buffer, &left, lval, false);
2378 if (err || !left)
2379 goto out;
2380
2381 err = proc_put_char(&buffer, &left, '\n');
2382
2383 out:
2384 *lenp -= left;
2385 *ppos += *lenp;
2386
2387 return err;
2388 }
2389
2390 static int __do_proc_douintvec(void *tbl_data, struct ctl_table *table,
2391 int write, void __user *buffer,
2392 size_t *lenp, loff_t *ppos,
2393 int (*conv)(unsigned long *lvalp,
2394 unsigned int *valp,
2395 int write, void *data),
2396 void *data)
2397 {
2398 unsigned int *i, vleft;
2399
2400 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
2401 *lenp = 0;
2402 return 0;
2403 }
2404
2405 i = (unsigned int *) tbl_data;
2406 vleft = table->maxlen / sizeof(*i);
2407
2408 /*
2409 * Arrays are not supported, keep this simple. *Do not* add
2410 * support for them.
2411 */
2412 if (vleft != 1) {
2413 *lenp = 0;
2414 return -EINVAL;
2415 }
2416
2417 if (!conv)
2418 conv = do_proc_douintvec_conv;
2419
2420 if (write)
2421 return do_proc_douintvec_w(i, table, buffer, lenp, ppos,
2422 conv, data);
2423 return do_proc_douintvec_r(i, buffer, lenp, ppos, conv, data);
2424 }
2425
2426 static int do_proc_douintvec(struct ctl_table *table, int write,
2427 void __user *buffer, size_t *lenp, loff_t *ppos,
2428 int (*conv)(unsigned long *lvalp,
2429 unsigned int *valp,
2430 int write, void *data),
2431 void *data)
2432 {
2433 return __do_proc_douintvec(table->data, table, write,
2434 buffer, lenp, ppos, conv, data);
2435 }
2436
2437 /**
2438 * proc_dointvec - read a vector of integers
2439 * @table: the sysctl table
2440 * @write: %TRUE if this is a write to the sysctl file
2441 * @buffer: the user buffer
2442 * @lenp: the size of the user buffer
2443 * @ppos: file position
2444 *
2445 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2446 * values from/to the user buffer, treated as an ASCII string.
2447 *
2448 * Returns 0 on success.
2449 */
2450 int proc_dointvec(struct ctl_table *table, int write,
2451 void __user *buffer, size_t *lenp, loff_t *ppos)
2452 {
2453 return do_proc_dointvec(table, write, buffer, lenp, ppos, NULL, NULL);
2454 }
2455
2456 /**
2457 * proc_douintvec - read a vector of unsigned integers
2458 * @table: the sysctl table
2459 * @write: %TRUE if this is a write to the sysctl file
2460 * @buffer: the user buffer
2461 * @lenp: the size of the user buffer
2462 * @ppos: file position
2463 *
2464 * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
2465 * values from/to the user buffer, treated as an ASCII string.
2466 *
2467 * Returns 0 on success.
2468 */
2469 int proc_douintvec(struct ctl_table *table, int write,
2470 void __user *buffer, size_t *lenp, loff_t *ppos)
2471 {
2472 return do_proc_douintvec(table, write, buffer, lenp, ppos,
2473 do_proc_douintvec_conv, NULL);
2474 }
2475
2476 /*
2477 * Taint values can only be increased
2478 * This means we can safely use a temporary.
2479 */
2480 static int proc_taint(struct ctl_table *table, int write,
2481 void __user *buffer, size_t *lenp, loff_t *ppos)
2482 {
2483 struct ctl_table t;
2484 unsigned long tmptaint = get_taint();
2485 int err;
2486
2487 if (write && !capable(CAP_SYS_ADMIN))
2488 return -EPERM;
2489
2490 t = *table;
2491 t.data = &tmptaint;
2492 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
2493 if (err < 0)
2494 return err;
2495
2496 if (write) {
2497 /*
2498 * Poor man's atomic or. Not worth adding a primitive
2499 * to everyone's atomic.h for this
2500 */
2501 int i;
2502 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2503 if ((tmptaint >> i) & 1)
2504 add_taint(i, LOCKDEP_STILL_OK);
2505 }
2506 }
2507
2508 return err;
2509 }
2510
2511 #ifdef CONFIG_PRINTK
2512 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
2513 void __user *buffer, size_t *lenp, loff_t *ppos)
2514 {
2515 if (write && !capable(CAP_SYS_ADMIN))
2516 return -EPERM;
2517
2518 return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2519 }
2520 #endif
2521
2522 struct do_proc_dointvec_minmax_conv_param {
2523 int *min;
2524 int *max;
2525 };
2526
2527 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
2528 int *valp,
2529 int write, void *data)
2530 {
2531 struct do_proc_dointvec_minmax_conv_param *param = data;
2532 if (write) {
2533 int val;
2534 if (*negp) {
2535 if (*lvalp > (unsigned long) INT_MAX + 1)
2536 return -EINVAL;
2537 val = -*lvalp;
2538 } else {
2539 if (*lvalp > (unsigned long) INT_MAX)
2540 return -EINVAL;
2541 val = *lvalp;
2542 }
2543 if ((param->min && *param->min > val) ||
2544 (param->max && *param->max < val))
2545 return -EINVAL;
2546 *valp = val;
2547 } else {
2548 int val = *valp;
2549 if (val < 0) {
2550 *negp = true;
2551 *lvalp = -(unsigned long)val;
2552 } else {
2553 *negp = false;
2554 *lvalp = (unsigned long)val;
2555 }
2556 }
2557 return 0;
2558 }
2559
2560 /**
2561 * proc_dointvec_minmax - read a vector of integers with min/max values
2562 * @table: the sysctl table
2563 * @write: %TRUE if this is a write to the sysctl file
2564 * @buffer: the user buffer
2565 * @lenp: the size of the user buffer
2566 * @ppos: file position
2567 *
2568 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2569 * values from/to the user buffer, treated as an ASCII string.
2570 *
2571 * This routine will ensure the values are within the range specified by
2572 * table->extra1 (min) and table->extra2 (max).
2573 *
2574 * Returns 0 on success.
2575 */
2576 int proc_dointvec_minmax(struct ctl_table *table, int write,
2577 void __user *buffer, size_t *lenp, loff_t *ppos)
2578 {
2579 struct do_proc_dointvec_minmax_conv_param param = {
2580 .min = (int *) table->extra1,
2581 .max = (int *) table->extra2,
2582 };
2583 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2584 do_proc_dointvec_minmax_conv, &param);
2585 }
2586
2587 struct do_proc_douintvec_minmax_conv_param {
2588 unsigned int *min;
2589 unsigned int *max;
2590 };
2591
2592 static int do_proc_douintvec_minmax_conv(unsigned long *lvalp,
2593 unsigned int *valp,
2594 int write, void *data)
2595 {
2596 struct do_proc_douintvec_minmax_conv_param *param = data;
2597
2598 if (write) {
2599 unsigned int val = *lvalp;
2600
2601 if ((param->min && *param->min > val) ||
2602 (param->max && *param->max < val))
2603 return -ERANGE;
2604
2605 if (*lvalp > UINT_MAX)
2606 return -EINVAL;
2607 *valp = val;
2608 } else {
2609 unsigned int val = *valp;
2610 *lvalp = (unsigned long) val;
2611 }
2612
2613 return 0;
2614 }
2615
2616 /**
2617 * proc_douintvec_minmax - read a vector of unsigned ints with min/max values
2618 * @table: the sysctl table
2619 * @write: %TRUE if this is a write to the sysctl file
2620 * @buffer: the user buffer
2621 * @lenp: the size of the user buffer
2622 * @ppos: file position
2623 *
2624 * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
2625 * values from/to the user buffer, treated as an ASCII string. Negative
2626 * strings are not allowed.
2627 *
2628 * This routine will ensure the values are within the range specified by
2629 * table->extra1 (min) and table->extra2 (max). There is a final sanity
2630 * check for UINT_MAX to avoid having to support wrap around uses from
2631 * userspace.
2632 *
2633 * Returns 0 on success.
2634 */
2635 int proc_douintvec_minmax(struct ctl_table *table, int write,
2636 void __user *buffer, size_t *lenp, loff_t *ppos)
2637 {
2638 struct do_proc_douintvec_minmax_conv_param param = {
2639 .min = (unsigned int *) table->extra1,
2640 .max = (unsigned int *) table->extra2,
2641 };
2642 return do_proc_douintvec(table, write, buffer, lenp, ppos,
2643 do_proc_douintvec_minmax_conv, &param);
2644 }
2645
2646 static void validate_coredump_safety(void)
2647 {
2648 #ifdef CONFIG_COREDUMP
2649 if (suid_dumpable == SUID_DUMP_ROOT &&
2650 core_pattern[0] != '/' && core_pattern[0] != '|') {
2651 printk(KERN_WARNING
2652 "Unsafe core_pattern used with fs.suid_dumpable=2.\n"
2653 "Pipe handler or fully qualified core dump path required.\n"
2654 "Set kernel.core_pattern before fs.suid_dumpable.\n"
2655 );
2656 }
2657 #endif
2658 }
2659
2660 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
2661 void __user *buffer, size_t *lenp, loff_t *ppos)
2662 {
2663 int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2664 if (!error)
2665 validate_coredump_safety();
2666 return error;
2667 }
2668
2669 #ifdef CONFIG_COREDUMP
2670 static int proc_dostring_coredump(struct ctl_table *table, int write,
2671 void __user *buffer, size_t *lenp, loff_t *ppos)
2672 {
2673 int error = proc_dostring(table, write, buffer, lenp, ppos);
2674 if (!error)
2675 validate_coredump_safety();
2676 return error;
2677 }
2678 #endif
2679
2680 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2681 void __user *buffer,
2682 size_t *lenp, loff_t *ppos,
2683 unsigned long convmul,
2684 unsigned long convdiv)
2685 {
2686 unsigned long *i, *min, *max;
2687 int vleft, first = 1, err = 0;
2688 size_t left;
2689 char *kbuf = NULL, *p;
2690
2691 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
2692 *lenp = 0;
2693 return 0;
2694 }
2695
2696 i = (unsigned long *) data;
2697 min = (unsigned long *) table->extra1;
2698 max = (unsigned long *) table->extra2;
2699 vleft = table->maxlen / sizeof(unsigned long);
2700 left = *lenp;
2701
2702 if (write) {
2703 if (proc_first_pos_non_zero_ignore(ppos, table))
2704 goto out;
2705
2706 if (left > PAGE_SIZE - 1)
2707 left = PAGE_SIZE - 1;
2708 p = kbuf = memdup_user_nul(buffer, left);
2709 if (IS_ERR(kbuf))
2710 return PTR_ERR(kbuf);
2711 }
2712
2713 for (; left && vleft--; i++, first = 0) {
2714 unsigned long val;
2715
2716 if (write) {
2717 bool neg;
2718
2719 left -= proc_skip_spaces(&p);
2720 if (!left)
2721 break;
2722
2723 err = proc_get_long(&p, &left, &val, &neg,
2724 proc_wspace_sep,
2725 sizeof(proc_wspace_sep), NULL);
2726 if (err)
2727 break;
2728 if (neg)
2729 continue;
2730 val = convmul * val / convdiv;
2731 if ((min && val < *min) || (max && val > *max))
2732 continue;
2733 *i = val;
2734 } else {
2735 val = convdiv * (*i) / convmul;
2736 if (!first) {
2737 err = proc_put_char(&buffer, &left, '\t');
2738 if (err)
2739 break;
2740 }
2741 err = proc_put_long(&buffer, &left, val, false);
2742 if (err)
2743 break;
2744 }
2745 }
2746
2747 if (!write && !first && left && !err)
2748 err = proc_put_char(&buffer, &left, '\n');
2749 if (write && !err)
2750 left -= proc_skip_spaces(&p);
2751 if (write) {
2752 kfree(kbuf);
2753 if (first)
2754 return err ? : -EINVAL;
2755 }
2756 *lenp -= left;
2757 out:
2758 *ppos += *lenp;
2759 return err;
2760 }
2761
2762 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2763 void __user *buffer,
2764 size_t *lenp, loff_t *ppos,
2765 unsigned long convmul,
2766 unsigned long convdiv)
2767 {
2768 return __do_proc_doulongvec_minmax(table->data, table, write,
2769 buffer, lenp, ppos, convmul, convdiv);
2770 }
2771
2772 /**
2773 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2774 * @table: the sysctl table
2775 * @write: %TRUE if this is a write to the sysctl file
2776 * @buffer: the user buffer
2777 * @lenp: the size of the user buffer
2778 * @ppos: file position
2779 *
2780 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2781 * values from/to the user buffer, treated as an ASCII string.
2782 *
2783 * This routine will ensure the values are within the range specified by
2784 * table->extra1 (min) and table->extra2 (max).
2785 *
2786 * Returns 0 on success.
2787 */
2788 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2789 void __user *buffer, size_t *lenp, loff_t *ppos)
2790 {
2791 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
2792 }
2793
2794 /**
2795 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2796 * @table: the sysctl table
2797 * @write: %TRUE if this is a write to the sysctl file
2798 * @buffer: the user buffer
2799 * @lenp: the size of the user buffer
2800 * @ppos: file position
2801 *
2802 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2803 * values from/to the user buffer, treated as an ASCII string. The values
2804 * are treated as milliseconds, and converted to jiffies when they are stored.
2805 *
2806 * This routine will ensure the values are within the range specified by
2807 * table->extra1 (min) and table->extra2 (max).
2808 *
2809 * Returns 0 on success.
2810 */
2811 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2812 void __user *buffer,
2813 size_t *lenp, loff_t *ppos)
2814 {
2815 return do_proc_doulongvec_minmax(table, write, buffer,
2816 lenp, ppos, HZ, 1000l);
2817 }
2818
2819
2820 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
2821 int *valp,
2822 int write, void *data)
2823 {
2824 if (write) {
2825 if (*lvalp > INT_MAX / HZ)
2826 return 1;
2827 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2828 } else {
2829 int val = *valp;
2830 unsigned long lval;
2831 if (val < 0) {
2832 *negp = true;
2833 lval = -(unsigned long)val;
2834 } else {
2835 *negp = false;
2836 lval = (unsigned long)val;
2837 }
2838 *lvalp = lval / HZ;
2839 }
2840 return 0;
2841 }
2842
2843 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
2844 int *valp,
2845 int write, void *data)
2846 {
2847 if (write) {
2848 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2849 return 1;
2850 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
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_clock_t(lval);
2862 }
2863 return 0;
2864 }
2865
2866 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
2867 int *valp,
2868 int write, void *data)
2869 {
2870 if (write) {
2871 unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2872
2873 if (jif > INT_MAX)
2874 return 1;
2875 *valp = (int)jif;
2876 } else {
2877 int val = *valp;
2878 unsigned long lval;
2879 if (val < 0) {
2880 *negp = true;
2881 lval = -(unsigned long)val;
2882 } else {
2883 *negp = false;
2884 lval = (unsigned long)val;
2885 }
2886 *lvalp = jiffies_to_msecs(lval);
2887 }
2888 return 0;
2889 }
2890
2891 /**
2892 * proc_dointvec_jiffies - read a vector of integers as seconds
2893 * @table: the sysctl table
2894 * @write: %TRUE if this is a write to the sysctl file
2895 * @buffer: the user buffer
2896 * @lenp: the size of the user buffer
2897 * @ppos: file position
2898 *
2899 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2900 * values from/to the user buffer, treated as an ASCII string.
2901 * The values read are assumed to be in seconds, and are converted into
2902 * jiffies.
2903 *
2904 * Returns 0 on success.
2905 */
2906 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2907 void __user *buffer, size_t *lenp, loff_t *ppos)
2908 {
2909 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2910 do_proc_dointvec_jiffies_conv,NULL);
2911 }
2912
2913 /**
2914 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2915 * @table: the sysctl table
2916 * @write: %TRUE if this is a write to the sysctl file
2917 * @buffer: the user buffer
2918 * @lenp: the size of the user buffer
2919 * @ppos: pointer to the file position
2920 *
2921 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2922 * values from/to the user buffer, treated as an ASCII string.
2923 * The values read are assumed to be in 1/USER_HZ seconds, and
2924 * are converted into jiffies.
2925 *
2926 * Returns 0 on success.
2927 */
2928 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2929 void __user *buffer, size_t *lenp, loff_t *ppos)
2930 {
2931 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2932 do_proc_dointvec_userhz_jiffies_conv,NULL);
2933 }
2934
2935 /**
2936 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2937 * @table: the sysctl table
2938 * @write: %TRUE if this is a write to the sysctl file
2939 * @buffer: the user buffer
2940 * @lenp: the size of the user buffer
2941 * @ppos: file position
2942 * @ppos: the current position in the file
2943 *
2944 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2945 * values from/to the user buffer, treated as an ASCII string.
2946 * The values read are assumed to be in 1/1000 seconds, and
2947 * are converted into jiffies.
2948 *
2949 * Returns 0 on success.
2950 */
2951 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2952 void __user *buffer, size_t *lenp, loff_t *ppos)
2953 {
2954 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2955 do_proc_dointvec_ms_jiffies_conv, NULL);
2956 }
2957
2958 static int proc_do_cad_pid(struct ctl_table *table, int write,
2959 void __user *buffer, size_t *lenp, loff_t *ppos)
2960 {
2961 struct pid *new_pid;
2962 pid_t tmp;
2963 int r;
2964
2965 tmp = pid_vnr(cad_pid);
2966
2967 r = __do_proc_dointvec(&tmp, table, write, buffer,
2968 lenp, ppos, NULL, NULL);
2969 if (r || !write)
2970 return r;
2971
2972 new_pid = find_get_pid(tmp);
2973 if (!new_pid)
2974 return -ESRCH;
2975
2976 put_pid(xchg(&cad_pid, new_pid));
2977 return 0;
2978 }
2979
2980 /**
2981 * proc_do_large_bitmap - read/write from/to a large bitmap
2982 * @table: the sysctl table
2983 * @write: %TRUE if this is a write to the sysctl file
2984 * @buffer: the user buffer
2985 * @lenp: the size of the user buffer
2986 * @ppos: file position
2987 *
2988 * The bitmap is stored at table->data and the bitmap length (in bits)
2989 * in table->maxlen.
2990 *
2991 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2992 * large bitmaps may be represented in a compact manner. Writing into
2993 * the file will clear the bitmap then update it with the given input.
2994 *
2995 * Returns 0 on success.
2996 */
2997 int proc_do_large_bitmap(struct ctl_table *table, int write,
2998 void __user *buffer, size_t *lenp, loff_t *ppos)
2999 {
3000 int err = 0;
3001 bool first = 1;
3002 size_t left = *lenp;
3003 unsigned long bitmap_len = table->maxlen;
3004 unsigned long *bitmap = *(unsigned long **) table->data;
3005 unsigned long *tmp_bitmap = NULL;
3006 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
3007
3008 if (!bitmap || !bitmap_len || !left || (*ppos && !write)) {
3009 *lenp = 0;
3010 return 0;
3011 }
3012
3013 if (write) {
3014 char *kbuf, *p;
3015
3016 if (left > PAGE_SIZE - 1)
3017 left = PAGE_SIZE - 1;
3018
3019 p = kbuf = memdup_user_nul(buffer, left);
3020 if (IS_ERR(kbuf))
3021 return PTR_ERR(kbuf);
3022
3023 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long),
3024 GFP_KERNEL);
3025 if (!tmp_bitmap) {
3026 kfree(kbuf);
3027 return -ENOMEM;
3028 }
3029 proc_skip_char(&p, &left, '\n');
3030 while (!err && left) {
3031 unsigned long val_a, val_b;
3032 bool neg;
3033
3034 err = proc_get_long(&p, &left, &val_a, &neg, tr_a,
3035 sizeof(tr_a), &c);
3036 if (err)
3037 break;
3038 if (val_a >= bitmap_len || neg) {
3039 err = -EINVAL;
3040 break;
3041 }
3042
3043 val_b = val_a;
3044 if (left) {
3045 p++;
3046 left--;
3047 }
3048
3049 if (c == '-') {
3050 err = proc_get_long(&p, &left, &val_b,
3051 &neg, tr_b, sizeof(tr_b),
3052 &c);
3053 if (err)
3054 break;
3055 if (val_b >= bitmap_len || neg ||
3056 val_a > val_b) {
3057 err = -EINVAL;
3058 break;
3059 }
3060 if (left) {
3061 p++;
3062 left--;
3063 }
3064 }
3065
3066 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
3067 first = 0;
3068 proc_skip_char(&p, &left, '\n');
3069 }
3070 kfree(kbuf);
3071 } else {
3072 unsigned long bit_a, bit_b = 0;
3073
3074 while (left) {
3075 bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
3076 if (bit_a >= bitmap_len)
3077 break;
3078 bit_b = find_next_zero_bit(bitmap, bitmap_len,
3079 bit_a + 1) - 1;
3080
3081 if (!first) {
3082 err = proc_put_char(&buffer, &left, ',');
3083 if (err)
3084 break;
3085 }
3086 err = proc_put_long(&buffer, &left, bit_a, false);
3087 if (err)
3088 break;
3089 if (bit_a != bit_b) {
3090 err = proc_put_char(&buffer, &left, '-');
3091 if (err)
3092 break;
3093 err = proc_put_long(&buffer, &left, bit_b, false);
3094 if (err)
3095 break;
3096 }
3097
3098 first = 0; bit_b++;
3099 }
3100 if (!err)
3101 err = proc_put_char(&buffer, &left, '\n');
3102 }
3103
3104 if (!err) {
3105 if (write) {
3106 if (*ppos)
3107 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
3108 else
3109 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
3110 }
3111 kfree(tmp_bitmap);
3112 *lenp -= left;
3113 *ppos += *lenp;
3114 return 0;
3115 } else {
3116 kfree(tmp_bitmap);
3117 return err;
3118 }
3119 }
3120
3121 #else /* CONFIG_PROC_SYSCTL */
3122
3123 int proc_dostring(struct ctl_table *table, int write,
3124 void __user *buffer, size_t *lenp, loff_t *ppos)
3125 {
3126 return -ENOSYS;
3127 }
3128
3129 int proc_dointvec(struct ctl_table *table, int write,
3130 void __user *buffer, size_t *lenp, loff_t *ppos)
3131 {
3132 return -ENOSYS;
3133 }
3134
3135 int proc_douintvec(struct ctl_table *table, int write,
3136 void __user *buffer, size_t *lenp, loff_t *ppos)
3137 {
3138 return -ENOSYS;
3139 }
3140
3141 int proc_dointvec_minmax(struct ctl_table *table, int write,
3142 void __user *buffer, size_t *lenp, loff_t *ppos)
3143 {
3144 return -ENOSYS;
3145 }
3146
3147 int proc_douintvec_minmax(struct ctl_table *table, int write,
3148 void __user *buffer, size_t *lenp, loff_t *ppos)
3149 {
3150 return -ENOSYS;
3151 }
3152
3153 int proc_dointvec_jiffies(struct ctl_table *table, int write,
3154 void __user *buffer, size_t *lenp, loff_t *ppos)
3155 {
3156 return -ENOSYS;
3157 }
3158
3159 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
3160 void __user *buffer, size_t *lenp, loff_t *ppos)
3161 {
3162 return -ENOSYS;
3163 }
3164
3165 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
3166 void __user *buffer, size_t *lenp, loff_t *ppos)
3167 {
3168 return -ENOSYS;
3169 }
3170
3171 int proc_doulongvec_minmax(struct ctl_table *table, int write,
3172 void __user *buffer, size_t *lenp, loff_t *ppos)
3173 {
3174 return -ENOSYS;
3175 }
3176
3177 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
3178 void __user *buffer,
3179 size_t *lenp, loff_t *ppos)
3180 {
3181 return -ENOSYS;
3182 }
3183
3184
3185 #endif /* CONFIG_PROC_SYSCTL */
3186
3187 /*
3188 * No sense putting this after each symbol definition, twice,
3189 * exception granted :-)
3190 */
3191 EXPORT_SYMBOL(proc_dointvec);
3192 EXPORT_SYMBOL(proc_douintvec);
3193 EXPORT_SYMBOL(proc_dointvec_jiffies);
3194 EXPORT_SYMBOL(proc_dointvec_minmax);
3195 EXPORT_SYMBOL_GPL(proc_douintvec_minmax);
3196 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
3197 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
3198 EXPORT_SYMBOL(proc_dostring);
3199 EXPORT_SYMBOL(proc_doulongvec_minmax);
3200 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
Linux with added FPC-III support