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Merge 4.14.112 into android-4.14-p
[GitHub/moto-9609/android_kernel_motorola_exynos9610.git] / kernel / sysctl.c
1 /*
2 * sysctl.c: General linux system control interface
3 *
4 * Begun 24 March 1995, Stephen Tweedie
5 * Added /proc support, Dec 1995
6 * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas.
7 * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver.
8 * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver.
9 * Dynamic registration fixes, Stephen Tweedie.
10 * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn.
11 * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris
12 * Horn.
13 * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer.
14 * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer.
15 * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill
16 * Wendling.
17 * The list_for_each() macro wasn't appropriate for the sysctl loop.
18 * Removed it and replaced it with older style, 03/23/00, Bill Wendling
19 */
20
21 #include <linux/module.h>
22 #include <linux/aio.h>
23 #include <linux/mm.h>
24 #include <linux/swap.h>
25 #include <linux/slab.h>
26 #include <linux/sysctl.h>
27 #include <linux/bitmap.h>
28 #include <linux/signal.h>
29 #include <linux/printk.h>
30 #include <linux/proc_fs.h>
31 #include <linux/security.h>
32 #include <linux/ctype.h>
33 #include <linux/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 extra_free_kbytes;
109 extern int pid_max_min, pid_max_max;
110 extern int percpu_pagelist_fraction;
111 extern int latencytop_enabled;
112 extern unsigned int sysctl_nr_open_min, sysctl_nr_open_max;
113 #ifndef CONFIG_MMU
114 extern int sysctl_nr_trim_pages;
115 #endif
116
117 /* Constants used for minimum and maximum */
118 #ifdef CONFIG_LOCKUP_DETECTOR
119 static int sixty = 60;
120 #endif
121
122 static int __maybe_unused neg_one = -1;
123
124 static int zero;
125 static int __maybe_unused one = 1;
126 static int __maybe_unused two = 2;
127 static int __maybe_unused four = 4;
128 static unsigned long one_ul = 1;
129 static unsigned long long_max = LONG_MAX;
130 static int one_hundred = 100;
131 static int one_thousand = 1000;
132 #ifdef CONFIG_PRINTK
133 static int ten_thousand = 10000;
134 #endif
135 #ifdef CONFIG_PERF_EVENTS
136 static int six_hundred_forty_kb = 640 * 1024;
137 #endif
138
139 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
140 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
141
142 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
143 static int maxolduid = 65535;
144 static int minolduid;
145
146 static int ngroups_max = NGROUPS_MAX;
147 static const int cap_last_cap = CAP_LAST_CAP;
148
149 /*this is needed for proc_doulongvec_minmax of sysctl_hung_task_timeout_secs */
150 #ifdef CONFIG_DETECT_HUNG_TASK
151 static unsigned long hung_task_timeout_max = (LONG_MAX/HZ);
152 #endif
153
154 #ifdef CONFIG_INOTIFY_USER
155 #include <linux/inotify.h>
156 #endif
157 #ifdef CONFIG_SPARC
158 #endif
159
160 #ifdef __hppa__
161 extern int pwrsw_enabled;
162 #endif
163
164 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
165 extern int unaligned_enabled;
166 #endif
167
168 #ifdef CONFIG_IA64
169 extern int unaligned_dump_stack;
170 #endif
171
172 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
173 extern int no_unaligned_warning;
174 #endif
175
176 #ifdef CONFIG_PROC_SYSCTL
177
178 /**
179 * enum sysctl_writes_mode - supported sysctl write modes
180 *
181 * @SYSCTL_WRITES_LEGACY: each write syscall must fully contain the sysctl value
182 * to be written, and multiple writes on the same sysctl file descriptor
183 * will rewrite the sysctl value, regardless of file position. No warning
184 * is issued when the initial position is not 0.
185 * @SYSCTL_WRITES_WARN: same as above but warn when the initial file position is
186 * not 0.
187 * @SYSCTL_WRITES_STRICT: writes to numeric sysctl entries must always be at
188 * file position 0 and the value must be fully contained in the buffer
189 * sent to the write syscall. If dealing with strings respect the file
190 * position, but restrict this to the max length of the buffer, anything
191 * passed the max lenght will be ignored. Multiple writes will append
192 * to the buffer.
193 *
194 * These write modes control how current file position affects the behavior of
195 * updating sysctl values through the proc interface on each write.
196 */
197 enum sysctl_writes_mode {
198 SYSCTL_WRITES_LEGACY = -1,
199 SYSCTL_WRITES_WARN = 0,
200 SYSCTL_WRITES_STRICT = 1,
201 };
202
203 static enum sysctl_writes_mode sysctl_writes_strict = SYSCTL_WRITES_STRICT;
204
205 static int proc_do_cad_pid(struct ctl_table *table, int write,
206 void __user *buffer, size_t *lenp, loff_t *ppos);
207 static int proc_taint(struct ctl_table *table, int write,
208 void __user *buffer, size_t *lenp, loff_t *ppos);
209 #endif
210
211 #ifdef CONFIG_PRINTK
212 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
213 void __user *buffer, size_t *lenp, loff_t *ppos);
214 #endif
215
216 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
217 void __user *buffer, size_t *lenp, loff_t *ppos);
218 #ifdef CONFIG_COREDUMP
219 static int proc_dostring_coredump(struct ctl_table *table, int write,
220 void __user *buffer, size_t *lenp, loff_t *ppos);
221 #endif
222
223 #ifdef CONFIG_MAGIC_SYSRQ
224 /* Note: sysrq code uses it's own private copy */
225 static int __sysrq_enabled = CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE;
226
227 static int sysrq_sysctl_handler(struct ctl_table *table, int write,
228 void __user *buffer, size_t *lenp,
229 loff_t *ppos)
230 {
231 int error;
232
233 error = proc_dointvec(table, write, buffer, lenp, ppos);
234 if (error)
235 return error;
236
237 if (write)
238 sysrq_toggle_support(__sysrq_enabled);
239
240 return 0;
241 }
242
243 #endif
244
245 static struct ctl_table kern_table[];
246 static struct ctl_table vm_table[];
247 static struct ctl_table fs_table[];
248 static struct ctl_table debug_table[];
249 static struct ctl_table dev_table[];
250 extern struct ctl_table random_table[];
251 #ifdef CONFIG_EPOLL
252 extern struct ctl_table epoll_table[];
253 #endif
254
255 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
256 int sysctl_legacy_va_layout;
257 #endif
258
259 /* The default sysctl tables: */
260
261 static struct ctl_table sysctl_base_table[] = {
262 {
263 .procname = "kernel",
264 .mode = 0555,
265 .child = kern_table,
266 },
267 {
268 .procname = "vm",
269 .mode = 0555,
270 .child = vm_table,
271 },
272 {
273 .procname = "fs",
274 .mode = 0555,
275 .child = fs_table,
276 },
277 {
278 .procname = "debug",
279 .mode = 0555,
280 .child = debug_table,
281 },
282 {
283 .procname = "dev",
284 .mode = 0555,
285 .child = dev_table,
286 },
287 { }
288 };
289
290 #ifdef CONFIG_SCHED_DEBUG
291 static int min_sched_granularity_ns = 100000; /* 100 usecs */
292 static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */
293 static int min_wakeup_granularity_ns; /* 0 usecs */
294 static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */
295 #ifdef CONFIG_SMP
296 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
297 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
298 #endif /* CONFIG_SMP */
299 #endif /* CONFIG_SCHED_DEBUG */
300
301 #ifdef CONFIG_COMPACTION
302 static int min_extfrag_threshold;
303 static int max_extfrag_threshold = 1000;
304 #endif
305
306 static struct ctl_table kern_table[] = {
307 {
308 .procname = "sched_child_runs_first",
309 .data = &sysctl_sched_child_runs_first,
310 .maxlen = sizeof(unsigned int),
311 .mode = 0644,
312 .proc_handler = proc_dointvec,
313 },
314 #ifdef CONFIG_SCHED_DEBUG
315 {
316 .procname = "sched_min_granularity_ns",
317 .data = &sysctl_sched_min_granularity,
318 .maxlen = sizeof(unsigned int),
319 .mode = 0644,
320 .proc_handler = sched_proc_update_handler,
321 .extra1 = &min_sched_granularity_ns,
322 .extra2 = &max_sched_granularity_ns,
323 },
324 {
325 .procname = "sched_latency_ns",
326 .data = &sysctl_sched_latency,
327 .maxlen = sizeof(unsigned int),
328 .mode = 0644,
329 .proc_handler = sched_proc_update_handler,
330 .extra1 = &min_sched_granularity_ns,
331 .extra2 = &max_sched_granularity_ns,
332 },
333 #ifdef CONFIG_SCHED_WALT
334 {
335 .procname = "sched_use_walt_cpu_util",
336 .data = &sysctl_sched_use_walt_cpu_util,
337 .maxlen = sizeof(unsigned int),
338 .mode = 0644,
339 .proc_handler = proc_dointvec,
340 },
341 {
342 .procname = "sched_use_walt_task_util",
343 .data = &sysctl_sched_use_walt_task_util,
344 .maxlen = sizeof(unsigned int),
345 .mode = 0644,
346 .proc_handler = proc_dointvec,
347 },
348 {
349 .procname = "sched_walt_init_task_load_pct",
350 .data = &sysctl_sched_walt_init_task_load_pct,
351 .maxlen = sizeof(unsigned int),
352 .mode = 0644,
353 .proc_handler = proc_dointvec,
354 },
355 {
356 .procname = "sched_walt_cpu_high_irqload",
357 .data = &sysctl_sched_walt_cpu_high_irqload,
358 .maxlen = sizeof(unsigned int),
359 .mode = 0644,
360 .proc_handler = proc_dointvec,
361 },
362 #endif
363 {
364 .procname = "sched_sync_hint_enable",
365 .data = &sysctl_sched_sync_hint_enable,
366 .maxlen = sizeof(unsigned int),
367 .mode = 0644,
368 .proc_handler = proc_dointvec,
369 },
370 {
371 .procname = "sched_cstate_aware",
372 .data = &sysctl_sched_cstate_aware,
373 .maxlen = sizeof(unsigned int),
374 .mode = 0644,
375 .proc_handler = proc_dointvec,
376 },
377 {
378 .procname = "sched_wakeup_granularity_ns",
379 .data = &sysctl_sched_wakeup_granularity,
380 .maxlen = sizeof(unsigned int),
381 .mode = 0644,
382 .proc_handler = sched_proc_update_handler,
383 .extra1 = &min_wakeup_granularity_ns,
384 .extra2 = &max_wakeup_granularity_ns,
385 },
386 #ifdef CONFIG_SMP
387 {
388 .procname = "sched_tunable_scaling",
389 .data = &sysctl_sched_tunable_scaling,
390 .maxlen = sizeof(enum sched_tunable_scaling),
391 .mode = 0644,
392 .proc_handler = sched_proc_update_handler,
393 .extra1 = &min_sched_tunable_scaling,
394 .extra2 = &max_sched_tunable_scaling,
395 },
396 {
397 .procname = "sched_migration_cost_ns",
398 .data = &sysctl_sched_migration_cost,
399 .maxlen = sizeof(unsigned int),
400 .mode = 0644,
401 .proc_handler = proc_dointvec,
402 },
403 {
404 .procname = "sched_nr_migrate",
405 .data = &sysctl_sched_nr_migrate,
406 .maxlen = sizeof(unsigned int),
407 .mode = 0644,
408 .proc_handler = proc_dointvec,
409 },
410 {
411 .procname = "sched_time_avg_ms",
412 .data = &sysctl_sched_time_avg,
413 .maxlen = sizeof(unsigned int),
414 .mode = 0644,
415 .proc_handler = proc_dointvec_minmax,
416 .extra1 = &one,
417 },
418 #ifdef CONFIG_SCHEDSTATS
419 {
420 .procname = "sched_schedstats",
421 .data = NULL,
422 .maxlen = sizeof(unsigned int),
423 .mode = 0644,
424 .proc_handler = sysctl_schedstats,
425 .extra1 = &zero,
426 .extra2 = &one,
427 },
428 #endif /* CONFIG_SCHEDSTATS */
429 #endif /* CONFIG_SMP */
430 #ifdef CONFIG_NUMA_BALANCING
431 {
432 .procname = "numa_balancing_scan_delay_ms",
433 .data = &sysctl_numa_balancing_scan_delay,
434 .maxlen = sizeof(unsigned int),
435 .mode = 0644,
436 .proc_handler = proc_dointvec,
437 },
438 {
439 .procname = "numa_balancing_scan_period_min_ms",
440 .data = &sysctl_numa_balancing_scan_period_min,
441 .maxlen = sizeof(unsigned int),
442 .mode = 0644,
443 .proc_handler = proc_dointvec,
444 },
445 {
446 .procname = "numa_balancing_scan_period_max_ms",
447 .data = &sysctl_numa_balancing_scan_period_max,
448 .maxlen = sizeof(unsigned int),
449 .mode = 0644,
450 .proc_handler = proc_dointvec,
451 },
452 {
453 .procname = "numa_balancing_scan_size_mb",
454 .data = &sysctl_numa_balancing_scan_size,
455 .maxlen = sizeof(unsigned int),
456 .mode = 0644,
457 .proc_handler = proc_dointvec_minmax,
458 .extra1 = &one,
459 },
460 {
461 .procname = "numa_balancing",
462 .data = NULL, /* filled in by handler */
463 .maxlen = sizeof(unsigned int),
464 .mode = 0644,
465 .proc_handler = sysctl_numa_balancing,
466 .extra1 = &zero,
467 .extra2 = &one,
468 },
469 #endif /* CONFIG_NUMA_BALANCING */
470 #endif /* CONFIG_SCHED_DEBUG */
471 {
472 .procname = "sched_rt_period_us",
473 .data = &sysctl_sched_rt_period,
474 .maxlen = sizeof(unsigned int),
475 .mode = 0644,
476 .proc_handler = sched_rt_handler,
477 },
478 {
479 .procname = "sched_rt_runtime_us",
480 .data = &sysctl_sched_rt_runtime,
481 .maxlen = sizeof(int),
482 .mode = 0644,
483 .proc_handler = sched_rt_handler,
484 },
485 {
486 .procname = "sched_rr_timeslice_ms",
487 .data = &sysctl_sched_rr_timeslice,
488 .maxlen = sizeof(int),
489 .mode = 0644,
490 .proc_handler = sched_rr_handler,
491 },
492 #ifdef CONFIG_SCHED_AUTOGROUP
493 {
494 .procname = "sched_autogroup_enabled",
495 .data = &sysctl_sched_autogroup_enabled,
496 .maxlen = sizeof(unsigned int),
497 .mode = 0644,
498 .proc_handler = proc_dointvec_minmax,
499 .extra1 = &zero,
500 .extra2 = &one,
501 },
502 #endif
503 #ifdef CONFIG_CFS_BANDWIDTH
504 {
505 .procname = "sched_cfs_bandwidth_slice_us",
506 .data = &sysctl_sched_cfs_bandwidth_slice,
507 .maxlen = sizeof(unsigned int),
508 .mode = 0644,
509 .proc_handler = proc_dointvec_minmax,
510 .extra1 = &one,
511 },
512 #endif
513 #ifdef CONFIG_PROVE_LOCKING
514 {
515 .procname = "prove_locking",
516 .data = &prove_locking,
517 .maxlen = sizeof(int),
518 .mode = 0644,
519 .proc_handler = proc_dointvec,
520 },
521 #endif
522 #ifdef CONFIG_LOCK_STAT
523 {
524 .procname = "lock_stat",
525 .data = &lock_stat,
526 .maxlen = sizeof(int),
527 .mode = 0644,
528 .proc_handler = proc_dointvec,
529 },
530 #endif
531 {
532 .procname = "panic",
533 .data = &panic_timeout,
534 .maxlen = sizeof(int),
535 .mode = 0644,
536 .proc_handler = proc_dointvec,
537 },
538 #ifdef CONFIG_COREDUMP
539 {
540 .procname = "core_uses_pid",
541 .data = &core_uses_pid,
542 .maxlen = sizeof(int),
543 .mode = 0644,
544 .proc_handler = proc_dointvec,
545 },
546 {
547 .procname = "core_pattern",
548 .data = core_pattern,
549 .maxlen = CORENAME_MAX_SIZE,
550 .mode = 0644,
551 .proc_handler = proc_dostring_coredump,
552 },
553 {
554 .procname = "core_pipe_limit",
555 .data = &core_pipe_limit,
556 .maxlen = sizeof(unsigned int),
557 .mode = 0644,
558 .proc_handler = proc_dointvec,
559 },
560 #endif
561 #ifdef CONFIG_PROC_SYSCTL
562 {
563 .procname = "tainted",
564 .maxlen = sizeof(long),
565 .mode = 0644,
566 .proc_handler = proc_taint,
567 },
568 {
569 .procname = "sysctl_writes_strict",
570 .data = &sysctl_writes_strict,
571 .maxlen = sizeof(int),
572 .mode = 0644,
573 .proc_handler = proc_dointvec_minmax,
574 .extra1 = &neg_one,
575 .extra2 = &one,
576 },
577 #endif
578 #ifdef CONFIG_LATENCYTOP
579 {
580 .procname = "latencytop",
581 .data = &latencytop_enabled,
582 .maxlen = sizeof(int),
583 .mode = 0644,
584 .proc_handler = sysctl_latencytop,
585 },
586 #endif
587 #ifdef CONFIG_BLK_DEV_INITRD
588 {
589 .procname = "real-root-dev",
590 .data = &real_root_dev,
591 .maxlen = sizeof(int),
592 .mode = 0644,
593 .proc_handler = proc_dointvec,
594 },
595 #endif
596 {
597 .procname = "print-fatal-signals",
598 .data = &print_fatal_signals,
599 .maxlen = sizeof(int),
600 .mode = 0644,
601 .proc_handler = proc_dointvec,
602 },
603 #ifdef CONFIG_SPARC
604 {
605 .procname = "reboot-cmd",
606 .data = reboot_command,
607 .maxlen = 256,
608 .mode = 0644,
609 .proc_handler = proc_dostring,
610 },
611 {
612 .procname = "stop-a",
613 .data = &stop_a_enabled,
614 .maxlen = sizeof (int),
615 .mode = 0644,
616 .proc_handler = proc_dointvec,
617 },
618 {
619 .procname = "scons-poweroff",
620 .data = &scons_pwroff,
621 .maxlen = sizeof (int),
622 .mode = 0644,
623 .proc_handler = proc_dointvec,
624 },
625 #endif
626 #ifdef CONFIG_SPARC64
627 {
628 .procname = "tsb-ratio",
629 .data = &sysctl_tsb_ratio,
630 .maxlen = sizeof (int),
631 .mode = 0644,
632 .proc_handler = proc_dointvec,
633 },
634 #endif
635 #ifdef __hppa__
636 {
637 .procname = "soft-power",
638 .data = &pwrsw_enabled,
639 .maxlen = sizeof (int),
640 .mode = 0644,
641 .proc_handler = proc_dointvec,
642 },
643 #endif
644 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
645 {
646 .procname = "unaligned-trap",
647 .data = &unaligned_enabled,
648 .maxlen = sizeof (int),
649 .mode = 0644,
650 .proc_handler = proc_dointvec,
651 },
652 #endif
653 {
654 .procname = "ctrl-alt-del",
655 .data = &C_A_D,
656 .maxlen = sizeof(int),
657 .mode = 0644,
658 .proc_handler = proc_dointvec,
659 },
660 #ifdef CONFIG_FUNCTION_TRACER
661 {
662 .procname = "ftrace_enabled",
663 .data = &ftrace_enabled,
664 .maxlen = sizeof(int),
665 .mode = 0644,
666 .proc_handler = ftrace_enable_sysctl,
667 },
668 #endif
669 #ifdef CONFIG_STACK_TRACER
670 {
671 .procname = "stack_tracer_enabled",
672 .data = &stack_tracer_enabled,
673 .maxlen = sizeof(int),
674 .mode = 0644,
675 .proc_handler = stack_trace_sysctl,
676 },
677 #endif
678 #ifdef CONFIG_TRACING
679 {
680 .procname = "ftrace_dump_on_oops",
681 .data = &ftrace_dump_on_oops,
682 .maxlen = sizeof(int),
683 .mode = 0644,
684 .proc_handler = proc_dointvec,
685 },
686 {
687 .procname = "traceoff_on_warning",
688 .data = &__disable_trace_on_warning,
689 .maxlen = sizeof(__disable_trace_on_warning),
690 .mode = 0644,
691 .proc_handler = proc_dointvec,
692 },
693 {
694 .procname = "tracepoint_printk",
695 .data = &tracepoint_printk,
696 .maxlen = sizeof(tracepoint_printk),
697 .mode = 0644,
698 .proc_handler = tracepoint_printk_sysctl,
699 },
700 #endif
701 #ifdef CONFIG_KEXEC_CORE
702 {
703 .procname = "kexec_load_disabled",
704 .data = &kexec_load_disabled,
705 .maxlen = sizeof(int),
706 .mode = 0644,
707 /* only handle a transition from default "0" to "1" */
708 .proc_handler = proc_dointvec_minmax,
709 .extra1 = &one,
710 .extra2 = &one,
711 },
712 #endif
713 #ifdef CONFIG_MODULES
714 {
715 .procname = "modprobe",
716 .data = &modprobe_path,
717 .maxlen = KMOD_PATH_LEN,
718 .mode = 0644,
719 .proc_handler = proc_dostring,
720 },
721 {
722 .procname = "modules_disabled",
723 .data = &modules_disabled,
724 .maxlen = sizeof(int),
725 .mode = 0644,
726 /* only handle a transition from default "0" to "1" */
727 .proc_handler = proc_dointvec_minmax,
728 .extra1 = &one,
729 .extra2 = &one,
730 },
731 #endif
732 #ifdef CONFIG_UEVENT_HELPER
733 {
734 .procname = "hotplug",
735 .data = &uevent_helper,
736 .maxlen = UEVENT_HELPER_PATH_LEN,
737 .mode = 0644,
738 .proc_handler = proc_dostring,
739 },
740 #endif
741 #ifdef CONFIG_CHR_DEV_SG
742 {
743 .procname = "sg-big-buff",
744 .data = &sg_big_buff,
745 .maxlen = sizeof (int),
746 .mode = 0444,
747 .proc_handler = proc_dointvec,
748 },
749 #endif
750 #ifdef CONFIG_BSD_PROCESS_ACCT
751 {
752 .procname = "acct",
753 .data = &acct_parm,
754 .maxlen = 3*sizeof(int),
755 .mode = 0644,
756 .proc_handler = proc_dointvec,
757 },
758 #endif
759 #ifdef CONFIG_MAGIC_SYSRQ
760 {
761 .procname = "sysrq",
762 .data = &__sysrq_enabled,
763 .maxlen = sizeof (int),
764 .mode = 0644,
765 .proc_handler = sysrq_sysctl_handler,
766 },
767 #endif
768 #ifdef CONFIG_PROC_SYSCTL
769 {
770 .procname = "cad_pid",
771 .data = NULL,
772 .maxlen = sizeof (int),
773 .mode = 0600,
774 .proc_handler = proc_do_cad_pid,
775 },
776 #endif
777 {
778 .procname = "threads-max",
779 .data = NULL,
780 .maxlen = sizeof(int),
781 .mode = 0644,
782 .proc_handler = sysctl_max_threads,
783 },
784 {
785 .procname = "random",
786 .mode = 0555,
787 .child = random_table,
788 },
789 {
790 .procname = "usermodehelper",
791 .mode = 0555,
792 .child = usermodehelper_table,
793 },
794 {
795 .procname = "overflowuid",
796 .data = &overflowuid,
797 .maxlen = sizeof(int),
798 .mode = 0644,
799 .proc_handler = proc_dointvec_minmax,
800 .extra1 = &minolduid,
801 .extra2 = &maxolduid,
802 },
803 {
804 .procname = "overflowgid",
805 .data = &overflowgid,
806 .maxlen = sizeof(int),
807 .mode = 0644,
808 .proc_handler = proc_dointvec_minmax,
809 .extra1 = &minolduid,
810 .extra2 = &maxolduid,
811 },
812 #ifdef CONFIG_S390
813 #ifdef CONFIG_MATHEMU
814 {
815 .procname = "ieee_emulation_warnings",
816 .data = &sysctl_ieee_emulation_warnings,
817 .maxlen = sizeof(int),
818 .mode = 0644,
819 .proc_handler = proc_dointvec,
820 },
821 #endif
822 {
823 .procname = "userprocess_debug",
824 .data = &show_unhandled_signals,
825 .maxlen = sizeof(int),
826 .mode = 0644,
827 .proc_handler = proc_dointvec,
828 },
829 #endif
830 {
831 .procname = "pid_max",
832 .data = &pid_max,
833 .maxlen = sizeof (int),
834 .mode = 0644,
835 .proc_handler = proc_dointvec_minmax,
836 .extra1 = &pid_max_min,
837 .extra2 = &pid_max_max,
838 },
839 {
840 .procname = "panic_on_oops",
841 .data = &panic_on_oops,
842 .maxlen = sizeof(int),
843 .mode = 0644,
844 .proc_handler = proc_dointvec,
845 },
846 #if defined CONFIG_PRINTK
847 {
848 .procname = "printk",
849 .data = &console_loglevel,
850 .maxlen = 4*sizeof(int),
851 .mode = 0644,
852 .proc_handler = proc_dointvec,
853 },
854 {
855 .procname = "printk_ratelimit",
856 .data = &printk_ratelimit_state.interval,
857 .maxlen = sizeof(int),
858 .mode = 0644,
859 .proc_handler = proc_dointvec_jiffies,
860 },
861 {
862 .procname = "printk_ratelimit_burst",
863 .data = &printk_ratelimit_state.burst,
864 .maxlen = sizeof(int),
865 .mode = 0644,
866 .proc_handler = proc_dointvec,
867 },
868 {
869 .procname = "printk_delay",
870 .data = &printk_delay_msec,
871 .maxlen = sizeof(int),
872 .mode = 0644,
873 .proc_handler = proc_dointvec_minmax,
874 .extra1 = &zero,
875 .extra2 = &ten_thousand,
876 },
877 {
878 .procname = "printk_devkmsg",
879 .data = devkmsg_log_str,
880 .maxlen = DEVKMSG_STR_MAX_SIZE,
881 .mode = 0644,
882 .proc_handler = devkmsg_sysctl_set_loglvl,
883 },
884 {
885 .procname = "dmesg_restrict",
886 .data = &dmesg_restrict,
887 .maxlen = sizeof(int),
888 .mode = 0644,
889 .proc_handler = proc_dointvec_minmax_sysadmin,
890 .extra1 = &zero,
891 .extra2 = &one,
892 },
893 {
894 .procname = "kptr_restrict",
895 .data = &kptr_restrict,
896 .maxlen = sizeof(int),
897 .mode = 0644,
898 .proc_handler = proc_dointvec_minmax_sysadmin,
899 .extra1 = &zero,
900 .extra2 = &two,
901 },
902 #endif
903 {
904 .procname = "ngroups_max",
905 .data = &ngroups_max,
906 .maxlen = sizeof (int),
907 .mode = 0444,
908 .proc_handler = proc_dointvec,
909 },
910 {
911 .procname = "cap_last_cap",
912 .data = (void *)&cap_last_cap,
913 .maxlen = sizeof(int),
914 .mode = 0444,
915 .proc_handler = proc_dointvec,
916 },
917 #if defined(CONFIG_LOCKUP_DETECTOR)
918 {
919 .procname = "watchdog",
920 .data = &watchdog_user_enabled,
921 .maxlen = sizeof(int),
922 .mode = 0644,
923 .proc_handler = proc_watchdog,
924 .extra1 = &zero,
925 .extra2 = &one,
926 },
927 {
928 .procname = "watchdog_thresh",
929 .data = &watchdog_thresh,
930 .maxlen = sizeof(int),
931 .mode = 0644,
932 .proc_handler = proc_watchdog_thresh,
933 .extra1 = &zero,
934 .extra2 = &sixty,
935 },
936 {
937 .procname = "nmi_watchdog",
938 .data = &nmi_watchdog_user_enabled,
939 .maxlen = sizeof(int),
940 .mode = NMI_WATCHDOG_SYSCTL_PERM,
941 .proc_handler = proc_nmi_watchdog,
942 .extra1 = &zero,
943 .extra2 = &one,
944 },
945 {
946 .procname = "watchdog_cpumask",
947 .data = &watchdog_cpumask_bits,
948 .maxlen = NR_CPUS,
949 .mode = 0644,
950 .proc_handler = proc_watchdog_cpumask,
951 },
952 #ifdef CONFIG_SOFTLOCKUP_DETECTOR
953 {
954 .procname = "soft_watchdog",
955 .data = &soft_watchdog_user_enabled,
956 .maxlen = sizeof(int),
957 .mode = 0644,
958 .proc_handler = proc_soft_watchdog,
959 .extra1 = &zero,
960 .extra2 = &one,
961 },
962 {
963 .procname = "softlockup_panic",
964 .data = &softlockup_panic,
965 .maxlen = sizeof(int),
966 .mode = 0644,
967 .proc_handler = proc_dointvec_minmax,
968 .extra1 = &zero,
969 .extra2 = &one,
970 },
971 #ifdef CONFIG_SMP
972 {
973 .procname = "softlockup_all_cpu_backtrace",
974 .data = &sysctl_softlockup_all_cpu_backtrace,
975 .maxlen = sizeof(int),
976 .mode = 0644,
977 .proc_handler = proc_dointvec_minmax,
978 .extra1 = &zero,
979 .extra2 = &one,
980 },
981 #endif /* CONFIG_SMP */
982 #endif
983 #ifdef CONFIG_HARDLOCKUP_DETECTOR
984 {
985 .procname = "hardlockup_panic",
986 .data = &hardlockup_panic,
987 .maxlen = sizeof(int),
988 .mode = 0644,
989 .proc_handler = proc_dointvec_minmax,
990 .extra1 = &zero,
991 .extra2 = &one,
992 },
993 #ifdef CONFIG_SMP
994 {
995 .procname = "hardlockup_all_cpu_backtrace",
996 .data = &sysctl_hardlockup_all_cpu_backtrace,
997 .maxlen = sizeof(int),
998 .mode = 0644,
999 .proc_handler = proc_dointvec_minmax,
1000 .extra1 = &zero,
1001 .extra2 = &one,
1002 },
1003 #endif /* CONFIG_SMP */
1004 #endif
1005 #endif
1006
1007 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
1008 {
1009 .procname = "unknown_nmi_panic",
1010 .data = &unknown_nmi_panic,
1011 .maxlen = sizeof (int),
1012 .mode = 0644,
1013 .proc_handler = proc_dointvec,
1014 },
1015 #endif
1016 #if defined(CONFIG_X86)
1017 {
1018 .procname = "panic_on_unrecovered_nmi",
1019 .data = &panic_on_unrecovered_nmi,
1020 .maxlen = sizeof(int),
1021 .mode = 0644,
1022 .proc_handler = proc_dointvec,
1023 },
1024 {
1025 .procname = "panic_on_io_nmi",
1026 .data = &panic_on_io_nmi,
1027 .maxlen = sizeof(int),
1028 .mode = 0644,
1029 .proc_handler = proc_dointvec,
1030 },
1031 #ifdef CONFIG_DEBUG_STACKOVERFLOW
1032 {
1033 .procname = "panic_on_stackoverflow",
1034 .data = &sysctl_panic_on_stackoverflow,
1035 .maxlen = sizeof(int),
1036 .mode = 0644,
1037 .proc_handler = proc_dointvec,
1038 },
1039 #endif
1040 {
1041 .procname = "bootloader_type",
1042 .data = &bootloader_type,
1043 .maxlen = sizeof (int),
1044 .mode = 0444,
1045 .proc_handler = proc_dointvec,
1046 },
1047 {
1048 .procname = "bootloader_version",
1049 .data = &bootloader_version,
1050 .maxlen = sizeof (int),
1051 .mode = 0444,
1052 .proc_handler = proc_dointvec,
1053 },
1054 {
1055 .procname = "io_delay_type",
1056 .data = &io_delay_type,
1057 .maxlen = sizeof(int),
1058 .mode = 0644,
1059 .proc_handler = proc_dointvec,
1060 },
1061 #endif
1062 #if defined(CONFIG_MMU)
1063 {
1064 .procname = "randomize_va_space",
1065 .data = &randomize_va_space,
1066 .maxlen = sizeof(int),
1067 .mode = 0644,
1068 .proc_handler = proc_dointvec,
1069 },
1070 #endif
1071 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
1072 {
1073 .procname = "spin_retry",
1074 .data = &spin_retry,
1075 .maxlen = sizeof (int),
1076 .mode = 0644,
1077 .proc_handler = proc_dointvec,
1078 },
1079 #endif
1080 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
1081 {
1082 .procname = "acpi_video_flags",
1083 .data = &acpi_realmode_flags,
1084 .maxlen = sizeof (unsigned long),
1085 .mode = 0644,
1086 .proc_handler = proc_doulongvec_minmax,
1087 },
1088 #endif
1089 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
1090 {
1091 .procname = "ignore-unaligned-usertrap",
1092 .data = &no_unaligned_warning,
1093 .maxlen = sizeof (int),
1094 .mode = 0644,
1095 .proc_handler = proc_dointvec,
1096 },
1097 #endif
1098 #ifdef CONFIG_IA64
1099 {
1100 .procname = "unaligned-dump-stack",
1101 .data = &unaligned_dump_stack,
1102 .maxlen = sizeof (int),
1103 .mode = 0644,
1104 .proc_handler = proc_dointvec,
1105 },
1106 #endif
1107 #ifdef CONFIG_DETECT_HUNG_TASK
1108 {
1109 .procname = "hung_task_panic",
1110 .data = &sysctl_hung_task_panic,
1111 .maxlen = sizeof(int),
1112 .mode = 0644,
1113 .proc_handler = proc_dointvec_minmax,
1114 .extra1 = &zero,
1115 .extra2 = &one,
1116 },
1117 {
1118 .procname = "hung_task_check_count",
1119 .data = &sysctl_hung_task_check_count,
1120 .maxlen = sizeof(int),
1121 .mode = 0644,
1122 .proc_handler = proc_dointvec_minmax,
1123 .extra1 = &zero,
1124 },
1125 {
1126 .procname = "hung_task_timeout_secs",
1127 .data = &sysctl_hung_task_timeout_secs,
1128 .maxlen = sizeof(unsigned long),
1129 .mode = 0644,
1130 .proc_handler = proc_dohung_task_timeout_secs,
1131 .extra2 = &hung_task_timeout_max,
1132 },
1133 {
1134 .procname = "hung_task_warnings",
1135 .data = &sysctl_hung_task_warnings,
1136 .maxlen = sizeof(int),
1137 .mode = 0644,
1138 .proc_handler = proc_dointvec_minmax,
1139 .extra1 = &neg_one,
1140 },
1141 #endif
1142 #ifdef CONFIG_RT_MUTEXES
1143 {
1144 .procname = "max_lock_depth",
1145 .data = &max_lock_depth,
1146 .maxlen = sizeof(int),
1147 .mode = 0644,
1148 .proc_handler = proc_dointvec,
1149 },
1150 #endif
1151 {
1152 .procname = "poweroff_cmd",
1153 .data = &poweroff_cmd,
1154 .maxlen = POWEROFF_CMD_PATH_LEN,
1155 .mode = 0644,
1156 .proc_handler = proc_dostring,
1157 },
1158 #ifdef CONFIG_KEYS
1159 {
1160 .procname = "keys",
1161 .mode = 0555,
1162 .child = key_sysctls,
1163 },
1164 #endif
1165 #ifdef CONFIG_PERF_EVENTS
1166 /*
1167 * User-space scripts rely on the existence of this file
1168 * as a feature check for perf_events being enabled.
1169 *
1170 * So it's an ABI, do not remove!
1171 */
1172 {
1173 .procname = "perf_event_paranoid",
1174 .data = &sysctl_perf_event_paranoid,
1175 .maxlen = sizeof(sysctl_perf_event_paranoid),
1176 .mode = 0644,
1177 .proc_handler = proc_dointvec,
1178 },
1179 {
1180 .procname = "perf_event_mlock_kb",
1181 .data = &sysctl_perf_event_mlock,
1182 .maxlen = sizeof(sysctl_perf_event_mlock),
1183 .mode = 0644,
1184 .proc_handler = proc_dointvec,
1185 },
1186 {
1187 .procname = "perf_event_max_sample_rate",
1188 .data = &sysctl_perf_event_sample_rate,
1189 .maxlen = sizeof(sysctl_perf_event_sample_rate),
1190 .mode = 0644,
1191 .proc_handler = perf_proc_update_handler,
1192 .extra1 = &one,
1193 },
1194 {
1195 .procname = "perf_cpu_time_max_percent",
1196 .data = &sysctl_perf_cpu_time_max_percent,
1197 .maxlen = sizeof(sysctl_perf_cpu_time_max_percent),
1198 .mode = 0644,
1199 .proc_handler = perf_cpu_time_max_percent_handler,
1200 .extra1 = &zero,
1201 .extra2 = &one_hundred,
1202 },
1203 {
1204 .procname = "perf_event_max_stack",
1205 .data = &sysctl_perf_event_max_stack,
1206 .maxlen = sizeof(sysctl_perf_event_max_stack),
1207 .mode = 0644,
1208 .proc_handler = perf_event_max_stack_handler,
1209 .extra1 = &zero,
1210 .extra2 = &six_hundred_forty_kb,
1211 },
1212 {
1213 .procname = "perf_event_max_contexts_per_stack",
1214 .data = &sysctl_perf_event_max_contexts_per_stack,
1215 .maxlen = sizeof(sysctl_perf_event_max_contexts_per_stack),
1216 .mode = 0644,
1217 .proc_handler = perf_event_max_stack_handler,
1218 .extra1 = &zero,
1219 .extra2 = &one_thousand,
1220 },
1221 #endif
1222 {
1223 .procname = "panic_on_warn",
1224 .data = &panic_on_warn,
1225 .maxlen = sizeof(int),
1226 .mode = 0644,
1227 .proc_handler = proc_dointvec_minmax,
1228 .extra1 = &zero,
1229 .extra2 = &one,
1230 },
1231 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON)
1232 {
1233 .procname = "timer_migration",
1234 .data = &sysctl_timer_migration,
1235 .maxlen = sizeof(unsigned int),
1236 .mode = 0644,
1237 .proc_handler = timer_migration_handler,
1238 .extra1 = &zero,
1239 .extra2 = &one,
1240 },
1241 #endif
1242 #ifdef CONFIG_BPF_SYSCALL
1243 {
1244 .procname = "unprivileged_bpf_disabled",
1245 .data = &sysctl_unprivileged_bpf_disabled,
1246 .maxlen = sizeof(sysctl_unprivileged_bpf_disabled),
1247 .mode = 0644,
1248 /* only handle a transition from default "0" to "1" */
1249 .proc_handler = proc_dointvec_minmax,
1250 .extra1 = &one,
1251 .extra2 = &one,
1252 },
1253 #endif
1254 #if defined(CONFIG_TREE_RCU) || defined(CONFIG_PREEMPT_RCU)
1255 {
1256 .procname = "panic_on_rcu_stall",
1257 .data = &sysctl_panic_on_rcu_stall,
1258 .maxlen = sizeof(sysctl_panic_on_rcu_stall),
1259 .mode = 0644,
1260 .proc_handler = proc_dointvec_minmax,
1261 .extra1 = &zero,
1262 .extra2 = &one,
1263 },
1264 #endif
1265 { }
1266 };
1267
1268 static struct ctl_table vm_table[] = {
1269 {
1270 .procname = "overcommit_memory",
1271 .data = &sysctl_overcommit_memory,
1272 .maxlen = sizeof(sysctl_overcommit_memory),
1273 .mode = 0644,
1274 .proc_handler = proc_dointvec_minmax,
1275 .extra1 = &zero,
1276 .extra2 = &two,
1277 },
1278 {
1279 .procname = "panic_on_oom",
1280 .data = &sysctl_panic_on_oom,
1281 .maxlen = sizeof(sysctl_panic_on_oom),
1282 .mode = 0644,
1283 .proc_handler = proc_dointvec_minmax,
1284 .extra1 = &zero,
1285 .extra2 = &two,
1286 },
1287 {
1288 .procname = "oom_kill_allocating_task",
1289 .data = &sysctl_oom_kill_allocating_task,
1290 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
1291 .mode = 0644,
1292 .proc_handler = proc_dointvec,
1293 },
1294 {
1295 .procname = "oom_dump_tasks",
1296 .data = &sysctl_oom_dump_tasks,
1297 .maxlen = sizeof(sysctl_oom_dump_tasks),
1298 .mode = 0644,
1299 .proc_handler = proc_dointvec,
1300 },
1301 {
1302 .procname = "overcommit_ratio",
1303 .data = &sysctl_overcommit_ratio,
1304 .maxlen = sizeof(sysctl_overcommit_ratio),
1305 .mode = 0644,
1306 .proc_handler = overcommit_ratio_handler,
1307 },
1308 {
1309 .procname = "overcommit_kbytes",
1310 .data = &sysctl_overcommit_kbytes,
1311 .maxlen = sizeof(sysctl_overcommit_kbytes),
1312 .mode = 0644,
1313 .proc_handler = overcommit_kbytes_handler,
1314 },
1315 {
1316 .procname = "page-cluster",
1317 .data = &page_cluster,
1318 .maxlen = sizeof(int),
1319 .mode = 0644,
1320 .proc_handler = proc_dointvec_minmax,
1321 .extra1 = &zero,
1322 },
1323 {
1324 .procname = "dirty_background_ratio",
1325 .data = &dirty_background_ratio,
1326 .maxlen = sizeof(dirty_background_ratio),
1327 .mode = 0644,
1328 .proc_handler = dirty_background_ratio_handler,
1329 .extra1 = &zero,
1330 .extra2 = &one_hundred,
1331 },
1332 {
1333 .procname = "dirty_background_bytes",
1334 .data = &dirty_background_bytes,
1335 .maxlen = sizeof(dirty_background_bytes),
1336 .mode = 0644,
1337 .proc_handler = dirty_background_bytes_handler,
1338 .extra1 = &one_ul,
1339 },
1340 {
1341 .procname = "dirty_ratio",
1342 .data = &vm_dirty_ratio,
1343 .maxlen = sizeof(vm_dirty_ratio),
1344 .mode = 0644,
1345 .proc_handler = dirty_ratio_handler,
1346 .extra1 = &zero,
1347 .extra2 = &one_hundred,
1348 },
1349 {
1350 .procname = "dirty_bytes",
1351 .data = &vm_dirty_bytes,
1352 .maxlen = sizeof(vm_dirty_bytes),
1353 .mode = 0644,
1354 .proc_handler = dirty_bytes_handler,
1355 .extra1 = &dirty_bytes_min,
1356 },
1357 {
1358 .procname = "dirty_writeback_centisecs",
1359 .data = &dirty_writeback_interval,
1360 .maxlen = sizeof(dirty_writeback_interval),
1361 .mode = 0644,
1362 .proc_handler = dirty_writeback_centisecs_handler,
1363 },
1364 {
1365 .procname = "dirty_expire_centisecs",
1366 .data = &dirty_expire_interval,
1367 .maxlen = sizeof(dirty_expire_interval),
1368 .mode = 0644,
1369 .proc_handler = proc_dointvec_minmax,
1370 .extra1 = &zero,
1371 },
1372 {
1373 .procname = "dirtytime_expire_seconds",
1374 .data = &dirtytime_expire_interval,
1375 .maxlen = sizeof(dirty_expire_interval),
1376 .mode = 0644,
1377 .proc_handler = dirtytime_interval_handler,
1378 .extra1 = &zero,
1379 },
1380 {
1381 .procname = "nr_pdflush_threads",
1382 .mode = 0444 /* read-only */,
1383 .proc_handler = pdflush_proc_obsolete,
1384 },
1385 {
1386 .procname = "swappiness",
1387 .data = &vm_swappiness,
1388 .maxlen = sizeof(vm_swappiness),
1389 .mode = 0644,
1390 .proc_handler = proc_dointvec_minmax,
1391 .extra1 = &zero,
1392 .extra2 = &one_hundred,
1393 },
1394 #ifdef CONFIG_HUGETLB_PAGE
1395 {
1396 .procname = "nr_hugepages",
1397 .data = NULL,
1398 .maxlen = sizeof(unsigned long),
1399 .mode = 0644,
1400 .proc_handler = hugetlb_sysctl_handler,
1401 },
1402 #ifdef CONFIG_NUMA
1403 {
1404 .procname = "nr_hugepages_mempolicy",
1405 .data = NULL,
1406 .maxlen = sizeof(unsigned long),
1407 .mode = 0644,
1408 .proc_handler = &hugetlb_mempolicy_sysctl_handler,
1409 },
1410 #endif
1411 {
1412 .procname = "hugetlb_shm_group",
1413 .data = &sysctl_hugetlb_shm_group,
1414 .maxlen = sizeof(gid_t),
1415 .mode = 0644,
1416 .proc_handler = proc_dointvec,
1417 },
1418 {
1419 .procname = "hugepages_treat_as_movable",
1420 .data = &hugepages_treat_as_movable,
1421 .maxlen = sizeof(int),
1422 .mode = 0644,
1423 .proc_handler = proc_dointvec,
1424 },
1425 {
1426 .procname = "nr_overcommit_hugepages",
1427 .data = NULL,
1428 .maxlen = sizeof(unsigned long),
1429 .mode = 0644,
1430 .proc_handler = hugetlb_overcommit_handler,
1431 },
1432 #endif
1433 {
1434 .procname = "lowmem_reserve_ratio",
1435 .data = &sysctl_lowmem_reserve_ratio,
1436 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1437 .mode = 0644,
1438 .proc_handler = lowmem_reserve_ratio_sysctl_handler,
1439 },
1440 {
1441 .procname = "drop_caches",
1442 .data = &sysctl_drop_caches,
1443 .maxlen = sizeof(int),
1444 .mode = 0644,
1445 .proc_handler = drop_caches_sysctl_handler,
1446 .extra1 = &one,
1447 .extra2 = &four,
1448 },
1449 #ifdef CONFIG_COMPACTION
1450 {
1451 .procname = "compact_memory",
1452 .data = &sysctl_compact_memory,
1453 .maxlen = sizeof(int),
1454 .mode = 0200,
1455 .proc_handler = sysctl_compaction_handler,
1456 },
1457 {
1458 .procname = "extfrag_threshold",
1459 .data = &sysctl_extfrag_threshold,
1460 .maxlen = sizeof(int),
1461 .mode = 0644,
1462 .proc_handler = sysctl_extfrag_handler,
1463 .extra1 = &min_extfrag_threshold,
1464 .extra2 = &max_extfrag_threshold,
1465 },
1466 {
1467 .procname = "compact_unevictable_allowed",
1468 .data = &sysctl_compact_unevictable_allowed,
1469 .maxlen = sizeof(int),
1470 .mode = 0644,
1471 .proc_handler = proc_dointvec,
1472 .extra1 = &zero,
1473 .extra2 = &one,
1474 },
1475
1476 #endif /* CONFIG_COMPACTION */
1477 {
1478 .procname = "min_free_kbytes",
1479 .data = &min_free_kbytes,
1480 .maxlen = sizeof(min_free_kbytes),
1481 .mode = 0644,
1482 .proc_handler = min_free_kbytes_sysctl_handler,
1483 .extra1 = &zero,
1484 },
1485 {
1486 .procname = "watermark_scale_factor",
1487 .data = &watermark_scale_factor,
1488 .maxlen = sizeof(watermark_scale_factor),
1489 .mode = 0644,
1490 .proc_handler = watermark_scale_factor_sysctl_handler,
1491 .extra1 = &one,
1492 .extra2 = &one_thousand,
1493 },
1494 {
1495 .procname = "extra_free_kbytes",
1496 .data = &extra_free_kbytes,
1497 .maxlen = sizeof(extra_free_kbytes),
1498 .mode = 0644,
1499 .proc_handler = min_free_kbytes_sysctl_handler,
1500 .extra1 = &zero,
1501 },
1502 {
1503 .procname = "percpu_pagelist_fraction",
1504 .data = &percpu_pagelist_fraction,
1505 .maxlen = sizeof(percpu_pagelist_fraction),
1506 .mode = 0644,
1507 .proc_handler = percpu_pagelist_fraction_sysctl_handler,
1508 .extra1 = &zero,
1509 },
1510 #ifdef CONFIG_MMU
1511 {
1512 .procname = "max_map_count",
1513 .data = &sysctl_max_map_count,
1514 .maxlen = sizeof(sysctl_max_map_count),
1515 .mode = 0644,
1516 .proc_handler = proc_dointvec_minmax,
1517 .extra1 = &zero,
1518 },
1519 #else
1520 {
1521 .procname = "nr_trim_pages",
1522 .data = &sysctl_nr_trim_pages,
1523 .maxlen = sizeof(sysctl_nr_trim_pages),
1524 .mode = 0644,
1525 .proc_handler = proc_dointvec_minmax,
1526 .extra1 = &zero,
1527 },
1528 #endif
1529 {
1530 .procname = "laptop_mode",
1531 .data = &laptop_mode,
1532 .maxlen = sizeof(laptop_mode),
1533 .mode = 0644,
1534 .proc_handler = proc_dointvec_jiffies,
1535 },
1536 {
1537 .procname = "block_dump",
1538 .data = &block_dump,
1539 .maxlen = sizeof(block_dump),
1540 .mode = 0644,
1541 .proc_handler = proc_dointvec,
1542 .extra1 = &zero,
1543 },
1544 {
1545 .procname = "vfs_cache_pressure",
1546 .data = &sysctl_vfs_cache_pressure,
1547 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1548 .mode = 0644,
1549 .proc_handler = proc_dointvec,
1550 .extra1 = &zero,
1551 },
1552 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1553 {
1554 .procname = "legacy_va_layout",
1555 .data = &sysctl_legacy_va_layout,
1556 .maxlen = sizeof(sysctl_legacy_va_layout),
1557 .mode = 0644,
1558 .proc_handler = proc_dointvec,
1559 .extra1 = &zero,
1560 },
1561 #endif
1562 #ifdef CONFIG_NUMA
1563 {
1564 .procname = "zone_reclaim_mode",
1565 .data = &node_reclaim_mode,
1566 .maxlen = sizeof(node_reclaim_mode),
1567 .mode = 0644,
1568 .proc_handler = proc_dointvec,
1569 .extra1 = &zero,
1570 },
1571 {
1572 .procname = "min_unmapped_ratio",
1573 .data = &sysctl_min_unmapped_ratio,
1574 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1575 .mode = 0644,
1576 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler,
1577 .extra1 = &zero,
1578 .extra2 = &one_hundred,
1579 },
1580 {
1581 .procname = "min_slab_ratio",
1582 .data = &sysctl_min_slab_ratio,
1583 .maxlen = sizeof(sysctl_min_slab_ratio),
1584 .mode = 0644,
1585 .proc_handler = sysctl_min_slab_ratio_sysctl_handler,
1586 .extra1 = &zero,
1587 .extra2 = &one_hundred,
1588 },
1589 #endif
1590 #ifdef CONFIG_SMP
1591 {
1592 .procname = "stat_interval",
1593 .data = &sysctl_stat_interval,
1594 .maxlen = sizeof(sysctl_stat_interval),
1595 .mode = 0644,
1596 .proc_handler = proc_dointvec_jiffies,
1597 },
1598 {
1599 .procname = "stat_refresh",
1600 .data = NULL,
1601 .maxlen = 0,
1602 .mode = 0600,
1603 .proc_handler = vmstat_refresh,
1604 },
1605 #endif
1606 #ifdef CONFIG_MMU
1607 {
1608 .procname = "mmap_min_addr",
1609 .data = &dac_mmap_min_addr,
1610 .maxlen = sizeof(unsigned long),
1611 .mode = 0644,
1612 .proc_handler = mmap_min_addr_handler,
1613 },
1614 #endif
1615 #ifdef CONFIG_NUMA
1616 {
1617 .procname = "numa_zonelist_order",
1618 .data = &numa_zonelist_order,
1619 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1620 .mode = 0644,
1621 .proc_handler = numa_zonelist_order_handler,
1622 },
1623 #endif
1624 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1625 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1626 {
1627 .procname = "vdso_enabled",
1628 #ifdef CONFIG_X86_32
1629 .data = &vdso32_enabled,
1630 .maxlen = sizeof(vdso32_enabled),
1631 #else
1632 .data = &vdso_enabled,
1633 .maxlen = sizeof(vdso_enabled),
1634 #endif
1635 .mode = 0644,
1636 .proc_handler = proc_dointvec,
1637 .extra1 = &zero,
1638 },
1639 #endif
1640 #ifdef CONFIG_HIGHMEM
1641 {
1642 .procname = "highmem_is_dirtyable",
1643 .data = &vm_highmem_is_dirtyable,
1644 .maxlen = sizeof(vm_highmem_is_dirtyable),
1645 .mode = 0644,
1646 .proc_handler = proc_dointvec_minmax,
1647 .extra1 = &zero,
1648 .extra2 = &one,
1649 },
1650 #endif
1651 #ifdef CONFIG_MEMORY_FAILURE
1652 {
1653 .procname = "memory_failure_early_kill",
1654 .data = &sysctl_memory_failure_early_kill,
1655 .maxlen = sizeof(sysctl_memory_failure_early_kill),
1656 .mode = 0644,
1657 .proc_handler = proc_dointvec_minmax,
1658 .extra1 = &zero,
1659 .extra2 = &one,
1660 },
1661 {
1662 .procname = "memory_failure_recovery",
1663 .data = &sysctl_memory_failure_recovery,
1664 .maxlen = sizeof(sysctl_memory_failure_recovery),
1665 .mode = 0644,
1666 .proc_handler = proc_dointvec_minmax,
1667 .extra1 = &zero,
1668 .extra2 = &one,
1669 },
1670 #endif
1671 {
1672 .procname = "user_reserve_kbytes",
1673 .data = &sysctl_user_reserve_kbytes,
1674 .maxlen = sizeof(sysctl_user_reserve_kbytes),
1675 .mode = 0644,
1676 .proc_handler = proc_doulongvec_minmax,
1677 },
1678 {
1679 .procname = "admin_reserve_kbytes",
1680 .data = &sysctl_admin_reserve_kbytes,
1681 .maxlen = sizeof(sysctl_admin_reserve_kbytes),
1682 .mode = 0644,
1683 .proc_handler = proc_doulongvec_minmax,
1684 },
1685 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS
1686 {
1687 .procname = "mmap_rnd_bits",
1688 .data = &mmap_rnd_bits,
1689 .maxlen = sizeof(mmap_rnd_bits),
1690 .mode = 0600,
1691 .proc_handler = proc_dointvec_minmax,
1692 .extra1 = (void *)&mmap_rnd_bits_min,
1693 .extra2 = (void *)&mmap_rnd_bits_max,
1694 },
1695 #endif
1696 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS
1697 {
1698 .procname = "mmap_rnd_compat_bits",
1699 .data = &mmap_rnd_compat_bits,
1700 .maxlen = sizeof(mmap_rnd_compat_bits),
1701 .mode = 0600,
1702 .proc_handler = proc_dointvec_minmax,
1703 .extra1 = (void *)&mmap_rnd_compat_bits_min,
1704 .extra2 = (void *)&mmap_rnd_compat_bits_max,
1705 },
1706 #endif
1707 { }
1708 };
1709
1710 static struct ctl_table fs_table[] = {
1711 {
1712 .procname = "inode-nr",
1713 .data = &inodes_stat,
1714 .maxlen = 2*sizeof(long),
1715 .mode = 0444,
1716 .proc_handler = proc_nr_inodes,
1717 },
1718 {
1719 .procname = "inode-state",
1720 .data = &inodes_stat,
1721 .maxlen = 7*sizeof(long),
1722 .mode = 0444,
1723 .proc_handler = proc_nr_inodes,
1724 },
1725 {
1726 .procname = "file-nr",
1727 .data = &files_stat,
1728 .maxlen = sizeof(files_stat),
1729 .mode = 0444,
1730 .proc_handler = proc_nr_files,
1731 },
1732 {
1733 .procname = "file-max",
1734 .data = &files_stat.max_files,
1735 .maxlen = sizeof(files_stat.max_files),
1736 .mode = 0644,
1737 .proc_handler = proc_doulongvec_minmax,
1738 .extra1 = &zero,
1739 .extra2 = &long_max,
1740 },
1741 {
1742 .procname = "nr_open",
1743 .data = &sysctl_nr_open,
1744 .maxlen = sizeof(unsigned int),
1745 .mode = 0644,
1746 .proc_handler = proc_dointvec_minmax,
1747 .extra1 = &sysctl_nr_open_min,
1748 .extra2 = &sysctl_nr_open_max,
1749 },
1750 {
1751 .procname = "dentry-state",
1752 .data = &dentry_stat,
1753 .maxlen = 6*sizeof(long),
1754 .mode = 0444,
1755 .proc_handler = proc_nr_dentry,
1756 },
1757 {
1758 .procname = "overflowuid",
1759 .data = &fs_overflowuid,
1760 .maxlen = sizeof(int),
1761 .mode = 0644,
1762 .proc_handler = proc_dointvec_minmax,
1763 .extra1 = &minolduid,
1764 .extra2 = &maxolduid,
1765 },
1766 {
1767 .procname = "overflowgid",
1768 .data = &fs_overflowgid,
1769 .maxlen = sizeof(int),
1770 .mode = 0644,
1771 .proc_handler = proc_dointvec_minmax,
1772 .extra1 = &minolduid,
1773 .extra2 = &maxolduid,
1774 },
1775 #ifdef CONFIG_FILE_LOCKING
1776 {
1777 .procname = "leases-enable",
1778 .data = &leases_enable,
1779 .maxlen = sizeof(int),
1780 .mode = 0644,
1781 .proc_handler = proc_dointvec,
1782 },
1783 #endif
1784 #ifdef CONFIG_DNOTIFY
1785 {
1786 .procname = "dir-notify-enable",
1787 .data = &dir_notify_enable,
1788 .maxlen = sizeof(int),
1789 .mode = 0644,
1790 .proc_handler = proc_dointvec,
1791 },
1792 #endif
1793 #ifdef CONFIG_MMU
1794 #ifdef CONFIG_FILE_LOCKING
1795 {
1796 .procname = "lease-break-time",
1797 .data = &lease_break_time,
1798 .maxlen = sizeof(int),
1799 .mode = 0644,
1800 .proc_handler = proc_dointvec,
1801 },
1802 #endif
1803 #ifdef CONFIG_AIO
1804 {
1805 .procname = "aio-nr",
1806 .data = &aio_nr,
1807 .maxlen = sizeof(aio_nr),
1808 .mode = 0444,
1809 .proc_handler = proc_doulongvec_minmax,
1810 },
1811 {
1812 .procname = "aio-max-nr",
1813 .data = &aio_max_nr,
1814 .maxlen = sizeof(aio_max_nr),
1815 .mode = 0644,
1816 .proc_handler = proc_doulongvec_minmax,
1817 },
1818 #endif /* CONFIG_AIO */
1819 #ifdef CONFIG_INOTIFY_USER
1820 {
1821 .procname = "inotify",
1822 .mode = 0555,
1823 .child = inotify_table,
1824 },
1825 #endif
1826 #ifdef CONFIG_EPOLL
1827 {
1828 .procname = "epoll",
1829 .mode = 0555,
1830 .child = epoll_table,
1831 },
1832 #endif
1833 #endif
1834 {
1835 .procname = "protected_symlinks",
1836 .data = &sysctl_protected_symlinks,
1837 .maxlen = sizeof(int),
1838 .mode = 0600,
1839 .proc_handler = proc_dointvec_minmax,
1840 .extra1 = &zero,
1841 .extra2 = &one,
1842 },
1843 {
1844 .procname = "protected_hardlinks",
1845 .data = &sysctl_protected_hardlinks,
1846 .maxlen = sizeof(int),
1847 .mode = 0600,
1848 .proc_handler = proc_dointvec_minmax,
1849 .extra1 = &zero,
1850 .extra2 = &one,
1851 },
1852 {
1853 .procname = "protected_fifos",
1854 .data = &sysctl_protected_fifos,
1855 .maxlen = sizeof(int),
1856 .mode = 0600,
1857 .proc_handler = proc_dointvec_minmax,
1858 .extra1 = &zero,
1859 .extra2 = &two,
1860 },
1861 {
1862 .procname = "protected_regular",
1863 .data = &sysctl_protected_regular,
1864 .maxlen = sizeof(int),
1865 .mode = 0600,
1866 .proc_handler = proc_dointvec_minmax,
1867 .extra1 = &zero,
1868 .extra2 = &two,
1869 },
1870 {
1871 .procname = "suid_dumpable",
1872 .data = &suid_dumpable,
1873 .maxlen = sizeof(int),
1874 .mode = 0644,
1875 .proc_handler = proc_dointvec_minmax_coredump,
1876 .extra1 = &zero,
1877 .extra2 = &two,
1878 },
1879 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1880 {
1881 .procname = "binfmt_misc",
1882 .mode = 0555,
1883 .child = sysctl_mount_point,
1884 },
1885 #endif
1886 {
1887 .procname = "pipe-max-size",
1888 .data = &pipe_max_size,
1889 .maxlen = sizeof(pipe_max_size),
1890 .mode = 0644,
1891 .proc_handler = &pipe_proc_fn,
1892 .extra1 = &pipe_min_size,
1893 },
1894 {
1895 .procname = "pipe-user-pages-hard",
1896 .data = &pipe_user_pages_hard,
1897 .maxlen = sizeof(pipe_user_pages_hard),
1898 .mode = 0644,
1899 .proc_handler = proc_doulongvec_minmax,
1900 },
1901 {
1902 .procname = "pipe-user-pages-soft",
1903 .data = &pipe_user_pages_soft,
1904 .maxlen = sizeof(pipe_user_pages_soft),
1905 .mode = 0644,
1906 .proc_handler = proc_doulongvec_minmax,
1907 },
1908 {
1909 .procname = "mount-max",
1910 .data = &sysctl_mount_max,
1911 .maxlen = sizeof(unsigned int),
1912 .mode = 0644,
1913 .proc_handler = proc_dointvec_minmax,
1914 .extra1 = &one,
1915 },
1916 { }
1917 };
1918
1919 static struct ctl_table debug_table[] = {
1920 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
1921 {
1922 .procname = "exception-trace",
1923 .data = &show_unhandled_signals,
1924 .maxlen = sizeof(int),
1925 .mode = 0644,
1926 .proc_handler = proc_dointvec
1927 },
1928 #endif
1929 #if defined(CONFIG_OPTPROBES)
1930 {
1931 .procname = "kprobes-optimization",
1932 .data = &sysctl_kprobes_optimization,
1933 .maxlen = sizeof(int),
1934 .mode = 0644,
1935 .proc_handler = proc_kprobes_optimization_handler,
1936 .extra1 = &zero,
1937 .extra2 = &one,
1938 },
1939 #endif
1940 { }
1941 };
1942
1943 static struct ctl_table dev_table[] = {
1944 { }
1945 };
1946
1947 int __init sysctl_init(void)
1948 {
1949 struct ctl_table_header *hdr;
1950
1951 hdr = register_sysctl_table(sysctl_base_table);
1952 kmemleak_not_leak(hdr);
1953 return 0;
1954 }
1955
1956 #endif /* CONFIG_SYSCTL */
1957
1958 /*
1959 * /proc/sys support
1960 */
1961
1962 #ifdef CONFIG_PROC_SYSCTL
1963
1964 static int _proc_do_string(char *data, int maxlen, int write,
1965 char __user *buffer,
1966 size_t *lenp, loff_t *ppos)
1967 {
1968 size_t len;
1969 char __user *p;
1970 char c;
1971
1972 if (!data || !maxlen || !*lenp) {
1973 *lenp = 0;
1974 return 0;
1975 }
1976
1977 if (write) {
1978 if (sysctl_writes_strict == SYSCTL_WRITES_STRICT) {
1979 /* Only continue writes not past the end of buffer. */
1980 len = strlen(data);
1981 if (len > maxlen - 1)
1982 len = maxlen - 1;
1983
1984 if (*ppos > len)
1985 return 0;
1986 len = *ppos;
1987 } else {
1988 /* Start writing from beginning of buffer. */
1989 len = 0;
1990 }
1991
1992 *ppos += *lenp;
1993 p = buffer;
1994 while ((p - buffer) < *lenp && len < maxlen - 1) {
1995 if (get_user(c, p++))
1996 return -EFAULT;
1997 if (c == 0 || c == '\n')
1998 break;
1999 data[len++] = c;
2000 }
2001 data[len] = 0;
2002 } else {
2003 len = strlen(data);
2004 if (len > maxlen)
2005 len = maxlen;
2006
2007 if (*ppos > len) {
2008 *lenp = 0;
2009 return 0;
2010 }
2011
2012 data += *ppos;
2013 len -= *ppos;
2014
2015 if (len > *lenp)
2016 len = *lenp;
2017 if (len)
2018 if (copy_to_user(buffer, data, len))
2019 return -EFAULT;
2020 if (len < *lenp) {
2021 if (put_user('\n', buffer + len))
2022 return -EFAULT;
2023 len++;
2024 }
2025 *lenp = len;
2026 *ppos += len;
2027 }
2028 return 0;
2029 }
2030
2031 static void warn_sysctl_write(struct ctl_table *table)
2032 {
2033 pr_warn_once("%s wrote to %s when file position was not 0!\n"
2034 "This will not be supported in the future. To silence this\n"
2035 "warning, set kernel.sysctl_writes_strict = -1\n",
2036 current->comm, table->procname);
2037 }
2038
2039 /**
2040 * proc_first_pos_non_zero_ignore - check if firs position is allowed
2041 * @ppos: file position
2042 * @table: the sysctl table
2043 *
2044 * Returns true if the first position is non-zero and the sysctl_writes_strict
2045 * mode indicates this is not allowed for numeric input types. String proc
2046 * hadlers can ignore the return value.
2047 */
2048 static bool proc_first_pos_non_zero_ignore(loff_t *ppos,
2049 struct ctl_table *table)
2050 {
2051 if (!*ppos)
2052 return false;
2053
2054 switch (sysctl_writes_strict) {
2055 case SYSCTL_WRITES_STRICT:
2056 return true;
2057 case SYSCTL_WRITES_WARN:
2058 warn_sysctl_write(table);
2059 return false;
2060 default:
2061 return false;
2062 }
2063 }
2064
2065 /**
2066 * proc_dostring - read a string sysctl
2067 * @table: the sysctl table
2068 * @write: %TRUE if this is a write to the sysctl file
2069 * @buffer: the user buffer
2070 * @lenp: the size of the user buffer
2071 * @ppos: file position
2072 *
2073 * Reads/writes a string from/to the user buffer. If the kernel
2074 * buffer provided is not large enough to hold the string, the
2075 * string is truncated. The copied string is %NULL-terminated.
2076 * If the string is being read by the user process, it is copied
2077 * and a newline '\n' is added. It is truncated if the buffer is
2078 * not large enough.
2079 *
2080 * Returns 0 on success.
2081 */
2082 int proc_dostring(struct ctl_table *table, int write,
2083 void __user *buffer, size_t *lenp, loff_t *ppos)
2084 {
2085 if (write)
2086 proc_first_pos_non_zero_ignore(ppos, table);
2087
2088 return _proc_do_string((char *)(table->data), table->maxlen, write,
2089 (char __user *)buffer, lenp, ppos);
2090 }
2091
2092 static size_t proc_skip_spaces(char **buf)
2093 {
2094 size_t ret;
2095 char *tmp = skip_spaces(*buf);
2096 ret = tmp - *buf;
2097 *buf = tmp;
2098 return ret;
2099 }
2100
2101 static void proc_skip_char(char **buf, size_t *size, const char v)
2102 {
2103 while (*size) {
2104 if (**buf != v)
2105 break;
2106 (*size)--;
2107 (*buf)++;
2108 }
2109 }
2110
2111 #define TMPBUFLEN 22
2112 /**
2113 * proc_get_long - reads an ASCII formatted integer from a user buffer
2114 *
2115 * @buf: a kernel buffer
2116 * @size: size of the kernel buffer
2117 * @val: this is where the number will be stored
2118 * @neg: set to %TRUE if number is negative
2119 * @perm_tr: a vector which contains the allowed trailers
2120 * @perm_tr_len: size of the perm_tr vector
2121 * @tr: pointer to store the trailer character
2122 *
2123 * In case of success %0 is returned and @buf and @size are updated with
2124 * the amount of bytes read. If @tr is non-NULL and a trailing
2125 * character exists (size is non-zero after returning from this
2126 * function), @tr is updated with the trailing character.
2127 */
2128 static int proc_get_long(char **buf, size_t *size,
2129 unsigned long *val, bool *neg,
2130 const char *perm_tr, unsigned perm_tr_len, char *tr)
2131 {
2132 int len;
2133 char *p, tmp[TMPBUFLEN];
2134
2135 if (!*size)
2136 return -EINVAL;
2137
2138 len = *size;
2139 if (len > TMPBUFLEN - 1)
2140 len = TMPBUFLEN - 1;
2141
2142 memcpy(tmp, *buf, len);
2143
2144 tmp[len] = 0;
2145 p = tmp;
2146 if (*p == '-' && *size > 1) {
2147 *neg = true;
2148 p++;
2149 } else
2150 *neg = false;
2151 if (!isdigit(*p))
2152 return -EINVAL;
2153
2154 *val = simple_strtoul(p, &p, 0);
2155
2156 len = p - tmp;
2157
2158 /* We don't know if the next char is whitespace thus we may accept
2159 * invalid integers (e.g. 1234...a) or two integers instead of one
2160 * (e.g. 123...1). So lets not allow such large numbers. */
2161 if (len == TMPBUFLEN - 1)
2162 return -EINVAL;
2163
2164 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
2165 return -EINVAL;
2166
2167 if (tr && (len < *size))
2168 *tr = *p;
2169
2170 *buf += len;
2171 *size -= len;
2172
2173 return 0;
2174 }
2175
2176 /**
2177 * proc_put_long - converts an integer to a decimal ASCII formatted string
2178 *
2179 * @buf: the user buffer
2180 * @size: the size of the user buffer
2181 * @val: the integer to be converted
2182 * @neg: sign of the number, %TRUE for negative
2183 *
2184 * In case of success %0 is returned and @buf and @size are updated with
2185 * the amount of bytes written.
2186 */
2187 static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
2188 bool neg)
2189 {
2190 int len;
2191 char tmp[TMPBUFLEN], *p = tmp;
2192
2193 sprintf(p, "%s%lu", neg ? "-" : "", val);
2194 len = strlen(tmp);
2195 if (len > *size)
2196 len = *size;
2197 if (copy_to_user(*buf, tmp, len))
2198 return -EFAULT;
2199 *size -= len;
2200 *buf += len;
2201 return 0;
2202 }
2203 #undef TMPBUFLEN
2204
2205 static int proc_put_char(void __user **buf, size_t *size, char c)
2206 {
2207 if (*size) {
2208 char __user **buffer = (char __user **)buf;
2209 if (put_user(c, *buffer))
2210 return -EFAULT;
2211 (*size)--, (*buffer)++;
2212 *buf = *buffer;
2213 }
2214 return 0;
2215 }
2216
2217 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
2218 int *valp,
2219 int write, void *data)
2220 {
2221 if (write) {
2222 if (*negp) {
2223 if (*lvalp > (unsigned long) INT_MAX + 1)
2224 return -EINVAL;
2225 *valp = -*lvalp;
2226 } else {
2227 if (*lvalp > (unsigned long) INT_MAX)
2228 return -EINVAL;
2229 *valp = *lvalp;
2230 }
2231 } else {
2232 int val = *valp;
2233 if (val < 0) {
2234 *negp = true;
2235 *lvalp = -(unsigned long)val;
2236 } else {
2237 *negp = false;
2238 *lvalp = (unsigned long)val;
2239 }
2240 }
2241 return 0;
2242 }
2243
2244 static int do_proc_douintvec_conv(unsigned long *lvalp,
2245 unsigned int *valp,
2246 int write, void *data)
2247 {
2248 if (write) {
2249 if (*lvalp > UINT_MAX)
2250 return -EINVAL;
2251 *valp = *lvalp;
2252 } else {
2253 unsigned int val = *valp;
2254 *lvalp = (unsigned long)val;
2255 }
2256 return 0;
2257 }
2258
2259 static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
2260
2261 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
2262 int write, void __user *buffer,
2263 size_t *lenp, loff_t *ppos,
2264 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2265 int write, void *data),
2266 void *data)
2267 {
2268 int *i, vleft, first = 1, err = 0;
2269 size_t left;
2270 char *kbuf = NULL, *p;
2271
2272 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
2273 *lenp = 0;
2274 return 0;
2275 }
2276
2277 i = (int *) tbl_data;
2278 vleft = table->maxlen / sizeof(*i);
2279 left = *lenp;
2280
2281 if (!conv)
2282 conv = do_proc_dointvec_conv;
2283
2284 if (write) {
2285 if (proc_first_pos_non_zero_ignore(ppos, table))
2286 goto out;
2287
2288 if (left > PAGE_SIZE - 1)
2289 left = PAGE_SIZE - 1;
2290 p = kbuf = memdup_user_nul(buffer, left);
2291 if (IS_ERR(kbuf))
2292 return PTR_ERR(kbuf);
2293 }
2294
2295 for (; left && vleft--; i++, first=0) {
2296 unsigned long lval;
2297 bool neg;
2298
2299 if (write) {
2300 left -= proc_skip_spaces(&p);
2301
2302 if (!left)
2303 break;
2304 err = proc_get_long(&p, &left, &lval, &neg,
2305 proc_wspace_sep,
2306 sizeof(proc_wspace_sep), NULL);
2307 if (err)
2308 break;
2309 if (conv(&neg, &lval, i, 1, data)) {
2310 err = -EINVAL;
2311 break;
2312 }
2313 } else {
2314 if (conv(&neg, &lval, i, 0, data)) {
2315 err = -EINVAL;
2316 break;
2317 }
2318 if (!first)
2319 err = proc_put_char(&buffer, &left, '\t');
2320 if (err)
2321 break;
2322 err = proc_put_long(&buffer, &left, lval, neg);
2323 if (err)
2324 break;
2325 }
2326 }
2327
2328 if (!write && !first && left && !err)
2329 err = proc_put_char(&buffer, &left, '\n');
2330 if (write && !err && left)
2331 left -= proc_skip_spaces(&p);
2332 if (write) {
2333 kfree(kbuf);
2334 if (first)
2335 return err ? : -EINVAL;
2336 }
2337 *lenp -= left;
2338 out:
2339 *ppos += *lenp;
2340 return err;
2341 }
2342
2343 static int do_proc_dointvec(struct ctl_table *table, int write,
2344 void __user *buffer, size_t *lenp, loff_t *ppos,
2345 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2346 int write, void *data),
2347 void *data)
2348 {
2349 return __do_proc_dointvec(table->data, table, write,
2350 buffer, lenp, ppos, conv, data);
2351 }
2352
2353 static int do_proc_douintvec_w(unsigned int *tbl_data,
2354 struct ctl_table *table,
2355 void __user *buffer,
2356 size_t *lenp, loff_t *ppos,
2357 int (*conv)(unsigned long *lvalp,
2358 unsigned int *valp,
2359 int write, void *data),
2360 void *data)
2361 {
2362 unsigned long lval;
2363 int err = 0;
2364 size_t left;
2365 bool neg;
2366 char *kbuf = NULL, *p;
2367
2368 left = *lenp;
2369
2370 if (proc_first_pos_non_zero_ignore(ppos, table))
2371 goto bail_early;
2372
2373 if (left > PAGE_SIZE - 1)
2374 left = PAGE_SIZE - 1;
2375
2376 p = kbuf = memdup_user_nul(buffer, left);
2377 if (IS_ERR(kbuf))
2378 return -EINVAL;
2379
2380 left -= proc_skip_spaces(&p);
2381 if (!left) {
2382 err = -EINVAL;
2383 goto out_free;
2384 }
2385
2386 err = proc_get_long(&p, &left, &lval, &neg,
2387 proc_wspace_sep,
2388 sizeof(proc_wspace_sep), NULL);
2389 if (err || neg) {
2390 err = -EINVAL;
2391 goto out_free;
2392 }
2393
2394 if (conv(&lval, tbl_data, 1, data)) {
2395 err = -EINVAL;
2396 goto out_free;
2397 }
2398
2399 if (!err && left)
2400 left -= proc_skip_spaces(&p);
2401
2402 out_free:
2403 kfree(kbuf);
2404 if (err)
2405 return -EINVAL;
2406
2407 return 0;
2408
2409 /* This is in keeping with old __do_proc_dointvec() */
2410 bail_early:
2411 *ppos += *lenp;
2412 return err;
2413 }
2414
2415 static int do_proc_douintvec_r(unsigned int *tbl_data, void __user *buffer,
2416 size_t *lenp, loff_t *ppos,
2417 int (*conv)(unsigned long *lvalp,
2418 unsigned int *valp,
2419 int write, void *data),
2420 void *data)
2421 {
2422 unsigned long lval;
2423 int err = 0;
2424 size_t left;
2425
2426 left = *lenp;
2427
2428 if (conv(&lval, tbl_data, 0, data)) {
2429 err = -EINVAL;
2430 goto out;
2431 }
2432
2433 err = proc_put_long(&buffer, &left, lval, false);
2434 if (err || !left)
2435 goto out;
2436
2437 err = proc_put_char(&buffer, &left, '\n');
2438
2439 out:
2440 *lenp -= left;
2441 *ppos += *lenp;
2442
2443 return err;
2444 }
2445
2446 static int __do_proc_douintvec(void *tbl_data, struct ctl_table *table,
2447 int write, void __user *buffer,
2448 size_t *lenp, loff_t *ppos,
2449 int (*conv)(unsigned long *lvalp,
2450 unsigned int *valp,
2451 int write, void *data),
2452 void *data)
2453 {
2454 unsigned int *i, vleft;
2455
2456 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
2457 *lenp = 0;
2458 return 0;
2459 }
2460
2461 i = (unsigned int *) tbl_data;
2462 vleft = table->maxlen / sizeof(*i);
2463
2464 /*
2465 * Arrays are not supported, keep this simple. *Do not* add
2466 * support for them.
2467 */
2468 if (vleft != 1) {
2469 *lenp = 0;
2470 return -EINVAL;
2471 }
2472
2473 if (!conv)
2474 conv = do_proc_douintvec_conv;
2475
2476 if (write)
2477 return do_proc_douintvec_w(i, table, buffer, lenp, ppos,
2478 conv, data);
2479 return do_proc_douintvec_r(i, buffer, lenp, ppos, conv, data);
2480 }
2481
2482 static int do_proc_douintvec(struct ctl_table *table, int write,
2483 void __user *buffer, size_t *lenp, loff_t *ppos,
2484 int (*conv)(unsigned long *lvalp,
2485 unsigned int *valp,
2486 int write, void *data),
2487 void *data)
2488 {
2489 return __do_proc_douintvec(table->data, table, write,
2490 buffer, lenp, ppos, conv, data);
2491 }
2492
2493 /**
2494 * proc_dointvec - read a vector of integers
2495 * @table: the sysctl table
2496 * @write: %TRUE if this is a write to the sysctl file
2497 * @buffer: the user buffer
2498 * @lenp: the size of the user buffer
2499 * @ppos: file position
2500 *
2501 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2502 * values from/to the user buffer, treated as an ASCII string.
2503 *
2504 * Returns 0 on success.
2505 */
2506 int proc_dointvec(struct ctl_table *table, int write,
2507 void __user *buffer, size_t *lenp, loff_t *ppos)
2508 {
2509 return do_proc_dointvec(table, write, buffer, lenp, ppos, NULL, NULL);
2510 }
2511
2512 /**
2513 * proc_douintvec - read a vector of unsigned integers
2514 * @table: the sysctl table
2515 * @write: %TRUE if this is a write to the sysctl file
2516 * @buffer: the user buffer
2517 * @lenp: the size of the user buffer
2518 * @ppos: file position
2519 *
2520 * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
2521 * values from/to the user buffer, treated as an ASCII string.
2522 *
2523 * Returns 0 on success.
2524 */
2525 int proc_douintvec(struct ctl_table *table, int write,
2526 void __user *buffer, size_t *lenp, loff_t *ppos)
2527 {
2528 return do_proc_douintvec(table, write, buffer, lenp, ppos,
2529 do_proc_douintvec_conv, NULL);
2530 }
2531
2532 /*
2533 * Taint values can only be increased
2534 * This means we can safely use a temporary.
2535 */
2536 static int proc_taint(struct ctl_table *table, int write,
2537 void __user *buffer, size_t *lenp, loff_t *ppos)
2538 {
2539 struct ctl_table t;
2540 unsigned long tmptaint = get_taint();
2541 int err;
2542
2543 if (write && !capable(CAP_SYS_ADMIN))
2544 return -EPERM;
2545
2546 t = *table;
2547 t.data = &tmptaint;
2548 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
2549 if (err < 0)
2550 return err;
2551
2552 if (write) {
2553 /*
2554 * Poor man's atomic or. Not worth adding a primitive
2555 * to everyone's atomic.h for this
2556 */
2557 int i;
2558 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2559 if ((tmptaint >> i) & 1)
2560 add_taint(i, LOCKDEP_STILL_OK);
2561 }
2562 }
2563
2564 return err;
2565 }
2566
2567 #ifdef CONFIG_PRINTK
2568 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
2569 void __user *buffer, size_t *lenp, loff_t *ppos)
2570 {
2571 if (write && !capable(CAP_SYS_ADMIN))
2572 return -EPERM;
2573
2574 return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2575 }
2576 #endif
2577
2578 struct do_proc_dointvec_minmax_conv_param {
2579 int *min;
2580 int *max;
2581 };
2582
2583 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
2584 int *valp,
2585 int write, void *data)
2586 {
2587 struct do_proc_dointvec_minmax_conv_param *param = data;
2588 if (write) {
2589 int val;
2590 if (*negp) {
2591 if (*lvalp > (unsigned long) INT_MAX + 1)
2592 return -EINVAL;
2593 val = -*lvalp;
2594 } else {
2595 if (*lvalp > (unsigned long) INT_MAX)
2596 return -EINVAL;
2597 val = *lvalp;
2598 }
2599 if ((param->min && *param->min > val) ||
2600 (param->max && *param->max < val))
2601 return -EINVAL;
2602 *valp = val;
2603 } else {
2604 int val = *valp;
2605 if (val < 0) {
2606 *negp = true;
2607 *lvalp = -(unsigned long)val;
2608 } else {
2609 *negp = false;
2610 *lvalp = (unsigned long)val;
2611 }
2612 }
2613 return 0;
2614 }
2615
2616 /**
2617 * proc_dointvec_minmax - read a vector of integers 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) integer
2625 * values from/to the user buffer, treated as an ASCII string.
2626 *
2627 * This routine will ensure the values are within the range specified by
2628 * table->extra1 (min) and table->extra2 (max).
2629 *
2630 * Returns 0 on success.
2631 */
2632 int proc_dointvec_minmax(struct ctl_table *table, int write,
2633 void __user *buffer, size_t *lenp, loff_t *ppos)
2634 {
2635 struct do_proc_dointvec_minmax_conv_param param = {
2636 .min = (int *) table->extra1,
2637 .max = (int *) table->extra2,
2638 };
2639 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2640 do_proc_dointvec_minmax_conv, &param);
2641 }
2642
2643 struct do_proc_douintvec_minmax_conv_param {
2644 unsigned int *min;
2645 unsigned int *max;
2646 };
2647
2648 static int do_proc_douintvec_minmax_conv(unsigned long *lvalp,
2649 unsigned int *valp,
2650 int write, void *data)
2651 {
2652 struct do_proc_douintvec_minmax_conv_param *param = data;
2653
2654 if (write) {
2655 unsigned int val = *lvalp;
2656
2657 if ((param->min && *param->min > val) ||
2658 (param->max && *param->max < val))
2659 return -ERANGE;
2660
2661 if (*lvalp > UINT_MAX)
2662 return -EINVAL;
2663 *valp = val;
2664 } else {
2665 unsigned int val = *valp;
2666 *lvalp = (unsigned long) val;
2667 }
2668
2669 return 0;
2670 }
2671
2672 /**
2673 * proc_douintvec_minmax - read a vector of unsigned ints with min/max values
2674 * @table: the sysctl table
2675 * @write: %TRUE if this is a write to the sysctl file
2676 * @buffer: the user buffer
2677 * @lenp: the size of the user buffer
2678 * @ppos: file position
2679 *
2680 * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
2681 * values from/to the user buffer, treated as an ASCII string. Negative
2682 * strings are not allowed.
2683 *
2684 * This routine will ensure the values are within the range specified by
2685 * table->extra1 (min) and table->extra2 (max). There is a final sanity
2686 * check for UINT_MAX to avoid having to support wrap around uses from
2687 * userspace.
2688 *
2689 * Returns 0 on success.
2690 */
2691 int proc_douintvec_minmax(struct ctl_table *table, int write,
2692 void __user *buffer, size_t *lenp, loff_t *ppos)
2693 {
2694 struct do_proc_douintvec_minmax_conv_param param = {
2695 .min = (unsigned int *) table->extra1,
2696 .max = (unsigned int *) table->extra2,
2697 };
2698 return do_proc_douintvec(table, write, buffer, lenp, ppos,
2699 do_proc_douintvec_minmax_conv, &param);
2700 }
2701
2702 static void validate_coredump_safety(void)
2703 {
2704 #ifdef CONFIG_COREDUMP
2705 if (suid_dumpable == SUID_DUMP_ROOT &&
2706 core_pattern[0] != '/' && core_pattern[0] != '|') {
2707 printk(KERN_WARNING
2708 "Unsafe core_pattern used with fs.suid_dumpable=2.\n"
2709 "Pipe handler or fully qualified core dump path required.\n"
2710 "Set kernel.core_pattern before fs.suid_dumpable.\n"
2711 );
2712 }
2713 #endif
2714 }
2715
2716 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
2717 void __user *buffer, size_t *lenp, loff_t *ppos)
2718 {
2719 int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2720 if (!error)
2721 validate_coredump_safety();
2722 return error;
2723 }
2724
2725 #ifdef CONFIG_COREDUMP
2726 static int proc_dostring_coredump(struct ctl_table *table, int write,
2727 void __user *buffer, size_t *lenp, loff_t *ppos)
2728 {
2729 int error = proc_dostring(table, write, buffer, lenp, ppos);
2730 if (!error)
2731 validate_coredump_safety();
2732 return error;
2733 }
2734 #endif
2735
2736 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2737 void __user *buffer,
2738 size_t *lenp, loff_t *ppos,
2739 unsigned long convmul,
2740 unsigned long convdiv)
2741 {
2742 unsigned long *i, *min, *max;
2743 int vleft, first = 1, err = 0;
2744 size_t left;
2745 char *kbuf = NULL, *p;
2746
2747 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
2748 *lenp = 0;
2749 return 0;
2750 }
2751
2752 i = (unsigned long *) data;
2753 min = (unsigned long *) table->extra1;
2754 max = (unsigned long *) table->extra2;
2755 vleft = table->maxlen / sizeof(unsigned long);
2756 left = *lenp;
2757
2758 if (write) {
2759 if (proc_first_pos_non_zero_ignore(ppos, table))
2760 goto out;
2761
2762 if (left > PAGE_SIZE - 1)
2763 left = PAGE_SIZE - 1;
2764 p = kbuf = memdup_user_nul(buffer, left);
2765 if (IS_ERR(kbuf))
2766 return PTR_ERR(kbuf);
2767 }
2768
2769 for (; left && vleft--; i++, first = 0) {
2770 unsigned long val;
2771
2772 if (write) {
2773 bool neg;
2774
2775 left -= proc_skip_spaces(&p);
2776 if (!left)
2777 break;
2778
2779 err = proc_get_long(&p, &left, &val, &neg,
2780 proc_wspace_sep,
2781 sizeof(proc_wspace_sep), NULL);
2782 if (err)
2783 break;
2784 if (neg)
2785 continue;
2786 val = convmul * val / convdiv;
2787 if ((min && val < *min) || (max && val > *max))
2788 continue;
2789 *i = val;
2790 } else {
2791 val = convdiv * (*i) / convmul;
2792 if (!first) {
2793 err = proc_put_char(&buffer, &left, '\t');
2794 if (err)
2795 break;
2796 }
2797 err = proc_put_long(&buffer, &left, val, false);
2798 if (err)
2799 break;
2800 }
2801 }
2802
2803 if (!write && !first && left && !err)
2804 err = proc_put_char(&buffer, &left, '\n');
2805 if (write && !err)
2806 left -= proc_skip_spaces(&p);
2807 if (write) {
2808 kfree(kbuf);
2809 if (first)
2810 return err ? : -EINVAL;
2811 }
2812 *lenp -= left;
2813 out:
2814 *ppos += *lenp;
2815 return err;
2816 }
2817
2818 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2819 void __user *buffer,
2820 size_t *lenp, loff_t *ppos,
2821 unsigned long convmul,
2822 unsigned long convdiv)
2823 {
2824 return __do_proc_doulongvec_minmax(table->data, table, write,
2825 buffer, lenp, ppos, convmul, convdiv);
2826 }
2827
2828 /**
2829 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2830 * @table: the sysctl table
2831 * @write: %TRUE if this is a write to the sysctl file
2832 * @buffer: the user buffer
2833 * @lenp: the size of the user buffer
2834 * @ppos: file position
2835 *
2836 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2837 * values from/to the user buffer, treated as an ASCII string.
2838 *
2839 * This routine will ensure the values are within the range specified by
2840 * table->extra1 (min) and table->extra2 (max).
2841 *
2842 * Returns 0 on success.
2843 */
2844 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2845 void __user *buffer, size_t *lenp, loff_t *ppos)
2846 {
2847 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
2848 }
2849
2850 /**
2851 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2852 * @table: the sysctl table
2853 * @write: %TRUE if this is a write to the sysctl file
2854 * @buffer: the user buffer
2855 * @lenp: the size of the user buffer
2856 * @ppos: file position
2857 *
2858 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2859 * values from/to the user buffer, treated as an ASCII string. The values
2860 * are treated as milliseconds, and converted to jiffies when they are stored.
2861 *
2862 * This routine will ensure the values are within the range specified by
2863 * table->extra1 (min) and table->extra2 (max).
2864 *
2865 * Returns 0 on success.
2866 */
2867 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2868 void __user *buffer,
2869 size_t *lenp, loff_t *ppos)
2870 {
2871 return do_proc_doulongvec_minmax(table, write, buffer,
2872 lenp, ppos, HZ, 1000l);
2873 }
2874
2875
2876 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
2877 int *valp,
2878 int write, void *data)
2879 {
2880 if (write) {
2881 if (*lvalp > INT_MAX / HZ)
2882 return 1;
2883 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2884 } else {
2885 int val = *valp;
2886 unsigned long lval;
2887 if (val < 0) {
2888 *negp = true;
2889 lval = -(unsigned long)val;
2890 } else {
2891 *negp = false;
2892 lval = (unsigned long)val;
2893 }
2894 *lvalp = lval / HZ;
2895 }
2896 return 0;
2897 }
2898
2899 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
2900 int *valp,
2901 int write, void *data)
2902 {
2903 if (write) {
2904 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2905 return 1;
2906 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2907 } else {
2908 int val = *valp;
2909 unsigned long lval;
2910 if (val < 0) {
2911 *negp = true;
2912 lval = -(unsigned long)val;
2913 } else {
2914 *negp = false;
2915 lval = (unsigned long)val;
2916 }
2917 *lvalp = jiffies_to_clock_t(lval);
2918 }
2919 return 0;
2920 }
2921
2922 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
2923 int *valp,
2924 int write, void *data)
2925 {
2926 if (write) {
2927 unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2928
2929 if (jif > INT_MAX)
2930 return 1;
2931 *valp = (int)jif;
2932 } else {
2933 int val = *valp;
2934 unsigned long lval;
2935 if (val < 0) {
2936 *negp = true;
2937 lval = -(unsigned long)val;
2938 } else {
2939 *negp = false;
2940 lval = (unsigned long)val;
2941 }
2942 *lvalp = jiffies_to_msecs(lval);
2943 }
2944 return 0;
2945 }
2946
2947 /**
2948 * proc_dointvec_jiffies - read a vector of integers as seconds
2949 * @table: the sysctl table
2950 * @write: %TRUE if this is a write to the sysctl file
2951 * @buffer: the user buffer
2952 * @lenp: the size of the user buffer
2953 * @ppos: file position
2954 *
2955 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2956 * values from/to the user buffer, treated as an ASCII string.
2957 * The values read are assumed to be in seconds, and are converted into
2958 * jiffies.
2959 *
2960 * Returns 0 on success.
2961 */
2962 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2963 void __user *buffer, size_t *lenp, loff_t *ppos)
2964 {
2965 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2966 do_proc_dointvec_jiffies_conv,NULL);
2967 }
2968
2969 /**
2970 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2971 * @table: the sysctl table
2972 * @write: %TRUE if this is a write to the sysctl file
2973 * @buffer: the user buffer
2974 * @lenp: the size of the user buffer
2975 * @ppos: pointer to the file position
2976 *
2977 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2978 * values from/to the user buffer, treated as an ASCII string.
2979 * The values read are assumed to be in 1/USER_HZ seconds, and
2980 * are converted into jiffies.
2981 *
2982 * Returns 0 on success.
2983 */
2984 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2985 void __user *buffer, size_t *lenp, loff_t *ppos)
2986 {
2987 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2988 do_proc_dointvec_userhz_jiffies_conv,NULL);
2989 }
2990
2991 /**
2992 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2993 * @table: the sysctl table
2994 * @write: %TRUE if this is a write to the sysctl file
2995 * @buffer: the user buffer
2996 * @lenp: the size of the user buffer
2997 * @ppos: file position
2998 * @ppos: the current position in the file
2999 *
3000 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
3001 * values from/to the user buffer, treated as an ASCII string.
3002 * The values read are assumed to be in 1/1000 seconds, and
3003 * are converted into jiffies.
3004 *
3005 * Returns 0 on success.
3006 */
3007 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
3008 void __user *buffer, size_t *lenp, loff_t *ppos)
3009 {
3010 return do_proc_dointvec(table, write, buffer, lenp, ppos,
3011 do_proc_dointvec_ms_jiffies_conv, NULL);
3012 }
3013
3014 static int proc_do_cad_pid(struct ctl_table *table, int write,
3015 void __user *buffer, size_t *lenp, loff_t *ppos)
3016 {
3017 struct pid *new_pid;
3018 pid_t tmp;
3019 int r;
3020
3021 tmp = pid_vnr(cad_pid);
3022
3023 r = __do_proc_dointvec(&tmp, table, write, buffer,
3024 lenp, ppos, NULL, NULL);
3025 if (r || !write)
3026 return r;
3027
3028 new_pid = find_get_pid(tmp);
3029 if (!new_pid)
3030 return -ESRCH;
3031
3032 put_pid(xchg(&cad_pid, new_pid));
3033 return 0;
3034 }
3035
3036 /**
3037 * proc_do_large_bitmap - read/write from/to a large bitmap
3038 * @table: the sysctl table
3039 * @write: %TRUE if this is a write to the sysctl file
3040 * @buffer: the user buffer
3041 * @lenp: the size of the user buffer
3042 * @ppos: file position
3043 *
3044 * The bitmap is stored at table->data and the bitmap length (in bits)
3045 * in table->maxlen.
3046 *
3047 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
3048 * large bitmaps may be represented in a compact manner. Writing into
3049 * the file will clear the bitmap then update it with the given input.
3050 *
3051 * Returns 0 on success.
3052 */
3053 int proc_do_large_bitmap(struct ctl_table *table, int write,
3054 void __user *buffer, size_t *lenp, loff_t *ppos)
3055 {
3056 int err = 0;
3057 bool first = 1;
3058 size_t left = *lenp;
3059 unsigned long bitmap_len = table->maxlen;
3060 unsigned long *bitmap = *(unsigned long **) table->data;
3061 unsigned long *tmp_bitmap = NULL;
3062 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
3063
3064 if (!bitmap || !bitmap_len || !left || (*ppos && !write)) {
3065 *lenp = 0;
3066 return 0;
3067 }
3068
3069 if (write) {
3070 char *kbuf, *p;
3071
3072 if (left > PAGE_SIZE - 1)
3073 left = PAGE_SIZE - 1;
3074
3075 p = kbuf = memdup_user_nul(buffer, left);
3076 if (IS_ERR(kbuf))
3077 return PTR_ERR(kbuf);
3078
3079 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long),
3080 GFP_KERNEL);
3081 if (!tmp_bitmap) {
3082 kfree(kbuf);
3083 return -ENOMEM;
3084 }
3085 proc_skip_char(&p, &left, '\n');
3086 while (!err && left) {
3087 unsigned long val_a, val_b;
3088 bool neg;
3089
3090 err = proc_get_long(&p, &left, &val_a, &neg, tr_a,
3091 sizeof(tr_a), &c);
3092 if (err)
3093 break;
3094 if (val_a >= bitmap_len || neg) {
3095 err = -EINVAL;
3096 break;
3097 }
3098
3099 val_b = val_a;
3100 if (left) {
3101 p++;
3102 left--;
3103 }
3104
3105 if (c == '-') {
3106 err = proc_get_long(&p, &left, &val_b,
3107 &neg, tr_b, sizeof(tr_b),
3108 &c);
3109 if (err)
3110 break;
3111 if (val_b >= bitmap_len || neg ||
3112 val_a > val_b) {
3113 err = -EINVAL;
3114 break;
3115 }
3116 if (left) {
3117 p++;
3118 left--;
3119 }
3120 }
3121
3122 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
3123 first = 0;
3124 proc_skip_char(&p, &left, '\n');
3125 }
3126 kfree(kbuf);
3127 } else {
3128 unsigned long bit_a, bit_b = 0;
3129
3130 while (left) {
3131 bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
3132 if (bit_a >= bitmap_len)
3133 break;
3134 bit_b = find_next_zero_bit(bitmap, bitmap_len,
3135 bit_a + 1) - 1;
3136
3137 if (!first) {
3138 err = proc_put_char(&buffer, &left, ',');
3139 if (err)
3140 break;
3141 }
3142 err = proc_put_long(&buffer, &left, bit_a, false);
3143 if (err)
3144 break;
3145 if (bit_a != bit_b) {
3146 err = proc_put_char(&buffer, &left, '-');
3147 if (err)
3148 break;
3149 err = proc_put_long(&buffer, &left, bit_b, false);
3150 if (err)
3151 break;
3152 }
3153
3154 first = 0; bit_b++;
3155 }
3156 if (!err)
3157 err = proc_put_char(&buffer, &left, '\n');
3158 }
3159
3160 if (!err) {
3161 if (write) {
3162 if (*ppos)
3163 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
3164 else
3165 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
3166 }
3167 kfree(tmp_bitmap);
3168 *lenp -= left;
3169 *ppos += *lenp;
3170 return 0;
3171 } else {
3172 kfree(tmp_bitmap);
3173 return err;
3174 }
3175 }
3176
3177 #else /* CONFIG_PROC_SYSCTL */
3178
3179 int proc_dostring(struct ctl_table *table, int write,
3180 void __user *buffer, size_t *lenp, loff_t *ppos)
3181 {
3182 return -ENOSYS;
3183 }
3184
3185 int proc_dointvec(struct ctl_table *table, int write,
3186 void __user *buffer, size_t *lenp, loff_t *ppos)
3187 {
3188 return -ENOSYS;
3189 }
3190
3191 int proc_douintvec(struct ctl_table *table, int write,
3192 void __user *buffer, size_t *lenp, loff_t *ppos)
3193 {
3194 return -ENOSYS;
3195 }
3196
3197 int proc_dointvec_minmax(struct ctl_table *table, int write,
3198 void __user *buffer, size_t *lenp, loff_t *ppos)
3199 {
3200 return -ENOSYS;
3201 }
3202
3203 int proc_douintvec_minmax(struct ctl_table *table, int write,
3204 void __user *buffer, size_t *lenp, loff_t *ppos)
3205 {
3206 return -ENOSYS;
3207 }
3208
3209 int proc_dointvec_jiffies(struct ctl_table *table, int write,
3210 void __user *buffer, size_t *lenp, loff_t *ppos)
3211 {
3212 return -ENOSYS;
3213 }
3214
3215 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
3216 void __user *buffer, size_t *lenp, loff_t *ppos)
3217 {
3218 return -ENOSYS;
3219 }
3220
3221 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
3222 void __user *buffer, size_t *lenp, loff_t *ppos)
3223 {
3224 return -ENOSYS;
3225 }
3226
3227 int proc_doulongvec_minmax(struct ctl_table *table, int write,
3228 void __user *buffer, size_t *lenp, loff_t *ppos)
3229 {
3230 return -ENOSYS;
3231 }
3232
3233 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
3234 void __user *buffer,
3235 size_t *lenp, loff_t *ppos)
3236 {
3237 return -ENOSYS;
3238 }
3239
3240
3241 #endif /* CONFIG_PROC_SYSCTL */
3242
3243 /*
3244 * No sense putting this after each symbol definition, twice,
3245 * exception granted :-)
3246 */
3247 EXPORT_SYMBOL(proc_dointvec);
3248 EXPORT_SYMBOL(proc_douintvec);
3249 EXPORT_SYMBOL(proc_dointvec_jiffies);
3250 EXPORT_SYMBOL(proc_dointvec_minmax);
3251 EXPORT_SYMBOL_GPL(proc_douintvec_minmax);
3252 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
3253 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
3254 EXPORT_SYMBOL(proc_dostring);
3255 EXPORT_SYMBOL(proc_doulongvec_minmax);
3256 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);