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f2fs: avoid wrong decrypted data from disk
[GitHub/MotorolaMobilityLLC/kernel-slsi.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 = "reap_mem_on_sigkill",
1303 .data = &sysctl_reap_mem_on_sigkill,
1304 .maxlen = sizeof(sysctl_reap_mem_on_sigkill),
1305 .mode = 0644,
1306 .proc_handler = proc_dointvec,
1307 },
1308 {
1309 .procname = "overcommit_ratio",
1310 .data = &sysctl_overcommit_ratio,
1311 .maxlen = sizeof(sysctl_overcommit_ratio),
1312 .mode = 0644,
1313 .proc_handler = overcommit_ratio_handler,
1314 },
1315 {
1316 .procname = "overcommit_kbytes",
1317 .data = &sysctl_overcommit_kbytes,
1318 .maxlen = sizeof(sysctl_overcommit_kbytes),
1319 .mode = 0644,
1320 .proc_handler = overcommit_kbytes_handler,
1321 },
1322 {
1323 .procname = "page-cluster",
1324 .data = &page_cluster,
1325 .maxlen = sizeof(int),
1326 .mode = 0644,
1327 .proc_handler = proc_dointvec_minmax,
1328 .extra1 = &zero,
1329 },
1330 {
1331 .procname = "dirty_background_ratio",
1332 .data = &dirty_background_ratio,
1333 .maxlen = sizeof(dirty_background_ratio),
1334 .mode = 0644,
1335 .proc_handler = dirty_background_ratio_handler,
1336 .extra1 = &zero,
1337 .extra2 = &one_hundred,
1338 },
1339 {
1340 .procname = "dirty_background_bytes",
1341 .data = &dirty_background_bytes,
1342 .maxlen = sizeof(dirty_background_bytes),
1343 .mode = 0644,
1344 .proc_handler = dirty_background_bytes_handler,
1345 .extra1 = &one_ul,
1346 },
1347 {
1348 .procname = "dirty_ratio",
1349 .data = &vm_dirty_ratio,
1350 .maxlen = sizeof(vm_dirty_ratio),
1351 .mode = 0644,
1352 .proc_handler = dirty_ratio_handler,
1353 .extra1 = &zero,
1354 .extra2 = &one_hundred,
1355 },
1356 {
1357 .procname = "dirty_bytes",
1358 .data = &vm_dirty_bytes,
1359 .maxlen = sizeof(vm_dirty_bytes),
1360 .mode = 0644,
1361 .proc_handler = dirty_bytes_handler,
1362 .extra1 = &dirty_bytes_min,
1363 },
1364 {
1365 .procname = "dirty_writeback_centisecs",
1366 .data = &dirty_writeback_interval,
1367 .maxlen = sizeof(dirty_writeback_interval),
1368 .mode = 0644,
1369 .proc_handler = dirty_writeback_centisecs_handler,
1370 },
1371 {
1372 .procname = "dirty_expire_centisecs",
1373 .data = &dirty_expire_interval,
1374 .maxlen = sizeof(dirty_expire_interval),
1375 .mode = 0644,
1376 .proc_handler = proc_dointvec_minmax,
1377 .extra1 = &zero,
1378 },
1379 {
1380 .procname = "dirtytime_expire_seconds",
1381 .data = &dirtytime_expire_interval,
1382 .maxlen = sizeof(dirty_expire_interval),
1383 .mode = 0644,
1384 .proc_handler = dirtytime_interval_handler,
1385 .extra1 = &zero,
1386 },
1387 {
1388 .procname = "nr_pdflush_threads",
1389 .mode = 0444 /* read-only */,
1390 .proc_handler = pdflush_proc_obsolete,
1391 },
1392 {
1393 .procname = "swappiness",
1394 .data = &vm_swappiness,
1395 .maxlen = sizeof(vm_swappiness),
1396 .mode = 0644,
1397 .proc_handler = proc_dointvec_minmax,
1398 .extra1 = &zero,
1399 .extra2 = &one_hundred,
1400 },
1401 #ifdef CONFIG_HUGETLB_PAGE
1402 {
1403 .procname = "nr_hugepages",
1404 .data = NULL,
1405 .maxlen = sizeof(unsigned long),
1406 .mode = 0644,
1407 .proc_handler = hugetlb_sysctl_handler,
1408 },
1409 #ifdef CONFIG_NUMA
1410 {
1411 .procname = "nr_hugepages_mempolicy",
1412 .data = NULL,
1413 .maxlen = sizeof(unsigned long),
1414 .mode = 0644,
1415 .proc_handler = &hugetlb_mempolicy_sysctl_handler,
1416 },
1417 #endif
1418 {
1419 .procname = "hugetlb_shm_group",
1420 .data = &sysctl_hugetlb_shm_group,
1421 .maxlen = sizeof(gid_t),
1422 .mode = 0644,
1423 .proc_handler = proc_dointvec,
1424 },
1425 {
1426 .procname = "hugepages_treat_as_movable",
1427 .data = &hugepages_treat_as_movable,
1428 .maxlen = sizeof(int),
1429 .mode = 0644,
1430 .proc_handler = proc_dointvec,
1431 },
1432 {
1433 .procname = "nr_overcommit_hugepages",
1434 .data = NULL,
1435 .maxlen = sizeof(unsigned long),
1436 .mode = 0644,
1437 .proc_handler = hugetlb_overcommit_handler,
1438 },
1439 #endif
1440 {
1441 .procname = "lowmem_reserve_ratio",
1442 .data = &sysctl_lowmem_reserve_ratio,
1443 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1444 .mode = 0644,
1445 .proc_handler = lowmem_reserve_ratio_sysctl_handler,
1446 },
1447 {
1448 .procname = "drop_caches",
1449 .data = &sysctl_drop_caches,
1450 .maxlen = sizeof(int),
1451 .mode = 0644,
1452 .proc_handler = drop_caches_sysctl_handler,
1453 .extra1 = &one,
1454 .extra2 = &four,
1455 },
1456 #ifdef CONFIG_COMPACTION
1457 {
1458 .procname = "compact_memory",
1459 .data = &sysctl_compact_memory,
1460 .maxlen = sizeof(int),
1461 .mode = 0200,
1462 .proc_handler = sysctl_compaction_handler,
1463 },
1464 {
1465 .procname = "extfrag_threshold",
1466 .data = &sysctl_extfrag_threshold,
1467 .maxlen = sizeof(int),
1468 .mode = 0644,
1469 .proc_handler = sysctl_extfrag_handler,
1470 .extra1 = &min_extfrag_threshold,
1471 .extra2 = &max_extfrag_threshold,
1472 },
1473 {
1474 .procname = "compact_unevictable_allowed",
1475 .data = &sysctl_compact_unevictable_allowed,
1476 .maxlen = sizeof(int),
1477 .mode = 0644,
1478 .proc_handler = proc_dointvec,
1479 .extra1 = &zero,
1480 .extra2 = &one,
1481 },
1482
1483 #endif /* CONFIG_COMPACTION */
1484 {
1485 .procname = "min_free_kbytes",
1486 .data = &min_free_kbytes,
1487 .maxlen = sizeof(min_free_kbytes),
1488 .mode = 0644,
1489 .proc_handler = min_free_kbytes_sysctl_handler,
1490 .extra1 = &zero,
1491 },
1492 {
1493 .procname = "watermark_scale_factor",
1494 .data = &watermark_scale_factor,
1495 .maxlen = sizeof(watermark_scale_factor),
1496 .mode = 0644,
1497 .proc_handler = watermark_scale_factor_sysctl_handler,
1498 .extra1 = &one,
1499 .extra2 = &one_thousand,
1500 },
1501 {
1502 .procname = "extra_free_kbytes",
1503 .data = &extra_free_kbytes,
1504 .maxlen = sizeof(extra_free_kbytes),
1505 .mode = 0644,
1506 .proc_handler = min_free_kbytes_sysctl_handler,
1507 .extra1 = &zero,
1508 },
1509 {
1510 .procname = "percpu_pagelist_fraction",
1511 .data = &percpu_pagelist_fraction,
1512 .maxlen = sizeof(percpu_pagelist_fraction),
1513 .mode = 0644,
1514 .proc_handler = percpu_pagelist_fraction_sysctl_handler,
1515 .extra1 = &zero,
1516 },
1517 #ifdef CONFIG_MMU
1518 {
1519 .procname = "max_map_count",
1520 .data = &sysctl_max_map_count,
1521 .maxlen = sizeof(sysctl_max_map_count),
1522 .mode = 0644,
1523 .proc_handler = proc_dointvec_minmax,
1524 .extra1 = &zero,
1525 },
1526 #else
1527 {
1528 .procname = "nr_trim_pages",
1529 .data = &sysctl_nr_trim_pages,
1530 .maxlen = sizeof(sysctl_nr_trim_pages),
1531 .mode = 0644,
1532 .proc_handler = proc_dointvec_minmax,
1533 .extra1 = &zero,
1534 },
1535 #endif
1536 {
1537 .procname = "laptop_mode",
1538 .data = &laptop_mode,
1539 .maxlen = sizeof(laptop_mode),
1540 .mode = 0644,
1541 .proc_handler = proc_dointvec_jiffies,
1542 },
1543 {
1544 .procname = "block_dump",
1545 .data = &block_dump,
1546 .maxlen = sizeof(block_dump),
1547 .mode = 0644,
1548 .proc_handler = proc_dointvec,
1549 .extra1 = &zero,
1550 },
1551 {
1552 .procname = "vfs_cache_pressure",
1553 .data = &sysctl_vfs_cache_pressure,
1554 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1555 .mode = 0644,
1556 .proc_handler = proc_dointvec,
1557 .extra1 = &zero,
1558 },
1559 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1560 {
1561 .procname = "legacy_va_layout",
1562 .data = &sysctl_legacy_va_layout,
1563 .maxlen = sizeof(sysctl_legacy_va_layout),
1564 .mode = 0644,
1565 .proc_handler = proc_dointvec,
1566 .extra1 = &zero,
1567 },
1568 #endif
1569 #ifdef CONFIG_NUMA
1570 {
1571 .procname = "zone_reclaim_mode",
1572 .data = &node_reclaim_mode,
1573 .maxlen = sizeof(node_reclaim_mode),
1574 .mode = 0644,
1575 .proc_handler = proc_dointvec,
1576 .extra1 = &zero,
1577 },
1578 {
1579 .procname = "min_unmapped_ratio",
1580 .data = &sysctl_min_unmapped_ratio,
1581 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1582 .mode = 0644,
1583 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler,
1584 .extra1 = &zero,
1585 .extra2 = &one_hundred,
1586 },
1587 {
1588 .procname = "min_slab_ratio",
1589 .data = &sysctl_min_slab_ratio,
1590 .maxlen = sizeof(sysctl_min_slab_ratio),
1591 .mode = 0644,
1592 .proc_handler = sysctl_min_slab_ratio_sysctl_handler,
1593 .extra1 = &zero,
1594 .extra2 = &one_hundred,
1595 },
1596 #endif
1597 #ifdef CONFIG_SMP
1598 {
1599 .procname = "stat_interval",
1600 .data = &sysctl_stat_interval,
1601 .maxlen = sizeof(sysctl_stat_interval),
1602 .mode = 0644,
1603 .proc_handler = proc_dointvec_jiffies,
1604 },
1605 {
1606 .procname = "stat_refresh",
1607 .data = NULL,
1608 .maxlen = 0,
1609 .mode = 0600,
1610 .proc_handler = vmstat_refresh,
1611 },
1612 #endif
1613 #ifdef CONFIG_MMU
1614 {
1615 .procname = "mmap_min_addr",
1616 .data = &dac_mmap_min_addr,
1617 .maxlen = sizeof(unsigned long),
1618 .mode = 0644,
1619 .proc_handler = mmap_min_addr_handler,
1620 },
1621 #endif
1622 #ifdef CONFIG_NUMA
1623 {
1624 .procname = "numa_zonelist_order",
1625 .data = &numa_zonelist_order,
1626 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1627 .mode = 0644,
1628 .proc_handler = numa_zonelist_order_handler,
1629 },
1630 #endif
1631 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1632 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1633 {
1634 .procname = "vdso_enabled",
1635 #ifdef CONFIG_X86_32
1636 .data = &vdso32_enabled,
1637 .maxlen = sizeof(vdso32_enabled),
1638 #else
1639 .data = &vdso_enabled,
1640 .maxlen = sizeof(vdso_enabled),
1641 #endif
1642 .mode = 0644,
1643 .proc_handler = proc_dointvec,
1644 .extra1 = &zero,
1645 },
1646 #endif
1647 #ifdef CONFIG_HIGHMEM
1648 {
1649 .procname = "highmem_is_dirtyable",
1650 .data = &vm_highmem_is_dirtyable,
1651 .maxlen = sizeof(vm_highmem_is_dirtyable),
1652 .mode = 0644,
1653 .proc_handler = proc_dointvec_minmax,
1654 .extra1 = &zero,
1655 .extra2 = &one,
1656 },
1657 #endif
1658 #ifdef CONFIG_MEMORY_FAILURE
1659 {
1660 .procname = "memory_failure_early_kill",
1661 .data = &sysctl_memory_failure_early_kill,
1662 .maxlen = sizeof(sysctl_memory_failure_early_kill),
1663 .mode = 0644,
1664 .proc_handler = proc_dointvec_minmax,
1665 .extra1 = &zero,
1666 .extra2 = &one,
1667 },
1668 {
1669 .procname = "memory_failure_recovery",
1670 .data = &sysctl_memory_failure_recovery,
1671 .maxlen = sizeof(sysctl_memory_failure_recovery),
1672 .mode = 0644,
1673 .proc_handler = proc_dointvec_minmax,
1674 .extra1 = &zero,
1675 .extra2 = &one,
1676 },
1677 #endif
1678 {
1679 .procname = "user_reserve_kbytes",
1680 .data = &sysctl_user_reserve_kbytes,
1681 .maxlen = sizeof(sysctl_user_reserve_kbytes),
1682 .mode = 0644,
1683 .proc_handler = proc_doulongvec_minmax,
1684 },
1685 {
1686 .procname = "admin_reserve_kbytes",
1687 .data = &sysctl_admin_reserve_kbytes,
1688 .maxlen = sizeof(sysctl_admin_reserve_kbytes),
1689 .mode = 0644,
1690 .proc_handler = proc_doulongvec_minmax,
1691 },
1692 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS
1693 {
1694 .procname = "mmap_rnd_bits",
1695 .data = &mmap_rnd_bits,
1696 .maxlen = sizeof(mmap_rnd_bits),
1697 .mode = 0600,
1698 .proc_handler = proc_dointvec_minmax,
1699 .extra1 = (void *)&mmap_rnd_bits_min,
1700 .extra2 = (void *)&mmap_rnd_bits_max,
1701 },
1702 #endif
1703 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS
1704 {
1705 .procname = "mmap_rnd_compat_bits",
1706 .data = &mmap_rnd_compat_bits,
1707 .maxlen = sizeof(mmap_rnd_compat_bits),
1708 .mode = 0600,
1709 .proc_handler = proc_dointvec_minmax,
1710 .extra1 = (void *)&mmap_rnd_compat_bits_min,
1711 .extra2 = (void *)&mmap_rnd_compat_bits_max,
1712 },
1713 #endif
1714 { }
1715 };
1716
1717 static struct ctl_table fs_table[] = {
1718 {
1719 .procname = "inode-nr",
1720 .data = &inodes_stat,
1721 .maxlen = 2*sizeof(long),
1722 .mode = 0444,
1723 .proc_handler = proc_nr_inodes,
1724 },
1725 {
1726 .procname = "inode-state",
1727 .data = &inodes_stat,
1728 .maxlen = 7*sizeof(long),
1729 .mode = 0444,
1730 .proc_handler = proc_nr_inodes,
1731 },
1732 {
1733 .procname = "file-nr",
1734 .data = &files_stat,
1735 .maxlen = sizeof(files_stat),
1736 .mode = 0444,
1737 .proc_handler = proc_nr_files,
1738 },
1739 {
1740 .procname = "file-max",
1741 .data = &files_stat.max_files,
1742 .maxlen = sizeof(files_stat.max_files),
1743 .mode = 0644,
1744 .proc_handler = proc_doulongvec_minmax,
1745 .extra1 = &zero,
1746 .extra2 = &long_max,
1747 },
1748 {
1749 .procname = "nr_open",
1750 .data = &sysctl_nr_open,
1751 .maxlen = sizeof(unsigned int),
1752 .mode = 0644,
1753 .proc_handler = proc_dointvec_minmax,
1754 .extra1 = &sysctl_nr_open_min,
1755 .extra2 = &sysctl_nr_open_max,
1756 },
1757 {
1758 .procname = "dentry-state",
1759 .data = &dentry_stat,
1760 .maxlen = 6*sizeof(long),
1761 .mode = 0444,
1762 .proc_handler = proc_nr_dentry,
1763 },
1764 {
1765 .procname = "overflowuid",
1766 .data = &fs_overflowuid,
1767 .maxlen = sizeof(int),
1768 .mode = 0644,
1769 .proc_handler = proc_dointvec_minmax,
1770 .extra1 = &minolduid,
1771 .extra2 = &maxolduid,
1772 },
1773 {
1774 .procname = "overflowgid",
1775 .data = &fs_overflowgid,
1776 .maxlen = sizeof(int),
1777 .mode = 0644,
1778 .proc_handler = proc_dointvec_minmax,
1779 .extra1 = &minolduid,
1780 .extra2 = &maxolduid,
1781 },
1782 #ifdef CONFIG_FILE_LOCKING
1783 {
1784 .procname = "leases-enable",
1785 .data = &leases_enable,
1786 .maxlen = sizeof(int),
1787 .mode = 0644,
1788 .proc_handler = proc_dointvec,
1789 },
1790 #endif
1791 #ifdef CONFIG_DNOTIFY
1792 {
1793 .procname = "dir-notify-enable",
1794 .data = &dir_notify_enable,
1795 .maxlen = sizeof(int),
1796 .mode = 0644,
1797 .proc_handler = proc_dointvec,
1798 },
1799 #endif
1800 #ifdef CONFIG_MMU
1801 #ifdef CONFIG_FILE_LOCKING
1802 {
1803 .procname = "lease-break-time",
1804 .data = &lease_break_time,
1805 .maxlen = sizeof(int),
1806 .mode = 0644,
1807 .proc_handler = proc_dointvec,
1808 },
1809 #endif
1810 #ifdef CONFIG_AIO
1811 {
1812 .procname = "aio-nr",
1813 .data = &aio_nr,
1814 .maxlen = sizeof(aio_nr),
1815 .mode = 0444,
1816 .proc_handler = proc_doulongvec_minmax,
1817 },
1818 {
1819 .procname = "aio-max-nr",
1820 .data = &aio_max_nr,
1821 .maxlen = sizeof(aio_max_nr),
1822 .mode = 0644,
1823 .proc_handler = proc_doulongvec_minmax,
1824 },
1825 #endif /* CONFIG_AIO */
1826 #ifdef CONFIG_INOTIFY_USER
1827 {
1828 .procname = "inotify",
1829 .mode = 0555,
1830 .child = inotify_table,
1831 },
1832 #endif
1833 #ifdef CONFIG_EPOLL
1834 {
1835 .procname = "epoll",
1836 .mode = 0555,
1837 .child = epoll_table,
1838 },
1839 #endif
1840 #endif
1841 {
1842 .procname = "protected_symlinks",
1843 .data = &sysctl_protected_symlinks,
1844 .maxlen = sizeof(int),
1845 .mode = 0600,
1846 .proc_handler = proc_dointvec_minmax,
1847 .extra1 = &zero,
1848 .extra2 = &one,
1849 },
1850 {
1851 .procname = "protected_hardlinks",
1852 .data = &sysctl_protected_hardlinks,
1853 .maxlen = sizeof(int),
1854 .mode = 0600,
1855 .proc_handler = proc_dointvec_minmax,
1856 .extra1 = &zero,
1857 .extra2 = &one,
1858 },
1859 {
1860 .procname = "protected_fifos",
1861 .data = &sysctl_protected_fifos,
1862 .maxlen = sizeof(int),
1863 .mode = 0600,
1864 .proc_handler = proc_dointvec_minmax,
1865 .extra1 = &zero,
1866 .extra2 = &two,
1867 },
1868 {
1869 .procname = "protected_regular",
1870 .data = &sysctl_protected_regular,
1871 .maxlen = sizeof(int),
1872 .mode = 0600,
1873 .proc_handler = proc_dointvec_minmax,
1874 .extra1 = &zero,
1875 .extra2 = &two,
1876 },
1877 {
1878 .procname = "suid_dumpable",
1879 .data = &suid_dumpable,
1880 .maxlen = sizeof(int),
1881 .mode = 0644,
1882 .proc_handler = proc_dointvec_minmax_coredump,
1883 .extra1 = &zero,
1884 .extra2 = &two,
1885 },
1886 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1887 {
1888 .procname = "binfmt_misc",
1889 .mode = 0555,
1890 .child = sysctl_mount_point,
1891 },
1892 #endif
1893 {
1894 .procname = "pipe-max-size",
1895 .data = &pipe_max_size,
1896 .maxlen = sizeof(pipe_max_size),
1897 .mode = 0644,
1898 .proc_handler = &pipe_proc_fn,
1899 .extra1 = &pipe_min_size,
1900 },
1901 {
1902 .procname = "pipe-user-pages-hard",
1903 .data = &pipe_user_pages_hard,
1904 .maxlen = sizeof(pipe_user_pages_hard),
1905 .mode = 0644,
1906 .proc_handler = proc_doulongvec_minmax,
1907 },
1908 {
1909 .procname = "pipe-user-pages-soft",
1910 .data = &pipe_user_pages_soft,
1911 .maxlen = sizeof(pipe_user_pages_soft),
1912 .mode = 0644,
1913 .proc_handler = proc_doulongvec_minmax,
1914 },
1915 {
1916 .procname = "mount-max",
1917 .data = &sysctl_mount_max,
1918 .maxlen = sizeof(unsigned int),
1919 .mode = 0644,
1920 .proc_handler = proc_dointvec_minmax,
1921 .extra1 = &one,
1922 },
1923 { }
1924 };
1925
1926 static struct ctl_table debug_table[] = {
1927 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
1928 {
1929 .procname = "exception-trace",
1930 .data = &show_unhandled_signals,
1931 .maxlen = sizeof(int),
1932 .mode = 0644,
1933 .proc_handler = proc_dointvec
1934 },
1935 #endif
1936 #if defined(CONFIG_OPTPROBES)
1937 {
1938 .procname = "kprobes-optimization",
1939 .data = &sysctl_kprobes_optimization,
1940 .maxlen = sizeof(int),
1941 .mode = 0644,
1942 .proc_handler = proc_kprobes_optimization_handler,
1943 .extra1 = &zero,
1944 .extra2 = &one,
1945 },
1946 #endif
1947 { }
1948 };
1949
1950 static struct ctl_table dev_table[] = {
1951 { }
1952 };
1953
1954 int __init sysctl_init(void)
1955 {
1956 struct ctl_table_header *hdr;
1957
1958 hdr = register_sysctl_table(sysctl_base_table);
1959 kmemleak_not_leak(hdr);
1960 return 0;
1961 }
1962
1963 #endif /* CONFIG_SYSCTL */
1964
1965 /*
1966 * /proc/sys support
1967 */
1968
1969 #ifdef CONFIG_PROC_SYSCTL
1970
1971 static int _proc_do_string(char *data, int maxlen, int write,
1972 char __user *buffer,
1973 size_t *lenp, loff_t *ppos)
1974 {
1975 size_t len;
1976 char __user *p;
1977 char c;
1978
1979 if (!data || !maxlen || !*lenp) {
1980 *lenp = 0;
1981 return 0;
1982 }
1983
1984 if (write) {
1985 if (sysctl_writes_strict == SYSCTL_WRITES_STRICT) {
1986 /* Only continue writes not past the end of buffer. */
1987 len = strlen(data);
1988 if (len > maxlen - 1)
1989 len = maxlen - 1;
1990
1991 if (*ppos > len)
1992 return 0;
1993 len = *ppos;
1994 } else {
1995 /* Start writing from beginning of buffer. */
1996 len = 0;
1997 }
1998
1999 *ppos += *lenp;
2000 p = buffer;
2001 while ((p - buffer) < *lenp && len < maxlen - 1) {
2002 if (get_user(c, p++))
2003 return -EFAULT;
2004 if (c == 0 || c == '\n')
2005 break;
2006 data[len++] = c;
2007 }
2008 data[len] = 0;
2009 } else {
2010 len = strlen(data);
2011 if (len > maxlen)
2012 len = maxlen;
2013
2014 if (*ppos > len) {
2015 *lenp = 0;
2016 return 0;
2017 }
2018
2019 data += *ppos;
2020 len -= *ppos;
2021
2022 if (len > *lenp)
2023 len = *lenp;
2024 if (len)
2025 if (copy_to_user(buffer, data, len))
2026 return -EFAULT;
2027 if (len < *lenp) {
2028 if (put_user('\n', buffer + len))
2029 return -EFAULT;
2030 len++;
2031 }
2032 *lenp = len;
2033 *ppos += len;
2034 }
2035 return 0;
2036 }
2037
2038 static void warn_sysctl_write(struct ctl_table *table)
2039 {
2040 pr_warn_once("%s wrote to %s when file position was not 0!\n"
2041 "This will not be supported in the future. To silence this\n"
2042 "warning, set kernel.sysctl_writes_strict = -1\n",
2043 current->comm, table->procname);
2044 }
2045
2046 /**
2047 * proc_first_pos_non_zero_ignore - check if firs position is allowed
2048 * @ppos: file position
2049 * @table: the sysctl table
2050 *
2051 * Returns true if the first position is non-zero and the sysctl_writes_strict
2052 * mode indicates this is not allowed for numeric input types. String proc
2053 * hadlers can ignore the return value.
2054 */
2055 static bool proc_first_pos_non_zero_ignore(loff_t *ppos,
2056 struct ctl_table *table)
2057 {
2058 if (!*ppos)
2059 return false;
2060
2061 switch (sysctl_writes_strict) {
2062 case SYSCTL_WRITES_STRICT:
2063 return true;
2064 case SYSCTL_WRITES_WARN:
2065 warn_sysctl_write(table);
2066 return false;
2067 default:
2068 return false;
2069 }
2070 }
2071
2072 /**
2073 * proc_dostring - read a string sysctl
2074 * @table: the sysctl table
2075 * @write: %TRUE if this is a write to the sysctl file
2076 * @buffer: the user buffer
2077 * @lenp: the size of the user buffer
2078 * @ppos: file position
2079 *
2080 * Reads/writes a string from/to the user buffer. If the kernel
2081 * buffer provided is not large enough to hold the string, the
2082 * string is truncated. The copied string is %NULL-terminated.
2083 * If the string is being read by the user process, it is copied
2084 * and a newline '\n' is added. It is truncated if the buffer is
2085 * not large enough.
2086 *
2087 * Returns 0 on success.
2088 */
2089 int proc_dostring(struct ctl_table *table, int write,
2090 void __user *buffer, size_t *lenp, loff_t *ppos)
2091 {
2092 if (write)
2093 proc_first_pos_non_zero_ignore(ppos, table);
2094
2095 return _proc_do_string((char *)(table->data), table->maxlen, write,
2096 (char __user *)buffer, lenp, ppos);
2097 }
2098
2099 static size_t proc_skip_spaces(char **buf)
2100 {
2101 size_t ret;
2102 char *tmp = skip_spaces(*buf);
2103 ret = tmp - *buf;
2104 *buf = tmp;
2105 return ret;
2106 }
2107
2108 static void proc_skip_char(char **buf, size_t *size, const char v)
2109 {
2110 while (*size) {
2111 if (**buf != v)
2112 break;
2113 (*size)--;
2114 (*buf)++;
2115 }
2116 }
2117
2118 #define TMPBUFLEN 22
2119 /**
2120 * proc_get_long - reads an ASCII formatted integer from a user buffer
2121 *
2122 * @buf: a kernel buffer
2123 * @size: size of the kernel buffer
2124 * @val: this is where the number will be stored
2125 * @neg: set to %TRUE if number is negative
2126 * @perm_tr: a vector which contains the allowed trailers
2127 * @perm_tr_len: size of the perm_tr vector
2128 * @tr: pointer to store the trailer character
2129 *
2130 * In case of success %0 is returned and @buf and @size are updated with
2131 * the amount of bytes read. If @tr is non-NULL and a trailing
2132 * character exists (size is non-zero after returning from this
2133 * function), @tr is updated with the trailing character.
2134 */
2135 static int proc_get_long(char **buf, size_t *size,
2136 unsigned long *val, bool *neg,
2137 const char *perm_tr, unsigned perm_tr_len, char *tr)
2138 {
2139 int len;
2140 char *p, tmp[TMPBUFLEN];
2141
2142 if (!*size)
2143 return -EINVAL;
2144
2145 len = *size;
2146 if (len > TMPBUFLEN - 1)
2147 len = TMPBUFLEN - 1;
2148
2149 memcpy(tmp, *buf, len);
2150
2151 tmp[len] = 0;
2152 p = tmp;
2153 if (*p == '-' && *size > 1) {
2154 *neg = true;
2155 p++;
2156 } else
2157 *neg = false;
2158 if (!isdigit(*p))
2159 return -EINVAL;
2160
2161 *val = simple_strtoul(p, &p, 0);
2162
2163 len = p - tmp;
2164
2165 /* We don't know if the next char is whitespace thus we may accept
2166 * invalid integers (e.g. 1234...a) or two integers instead of one
2167 * (e.g. 123...1). So lets not allow such large numbers. */
2168 if (len == TMPBUFLEN - 1)
2169 return -EINVAL;
2170
2171 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
2172 return -EINVAL;
2173
2174 if (tr && (len < *size))
2175 *tr = *p;
2176
2177 *buf += len;
2178 *size -= len;
2179
2180 return 0;
2181 }
2182
2183 /**
2184 * proc_put_long - converts an integer to a decimal ASCII formatted string
2185 *
2186 * @buf: the user buffer
2187 * @size: the size of the user buffer
2188 * @val: the integer to be converted
2189 * @neg: sign of the number, %TRUE for negative
2190 *
2191 * In case of success %0 is returned and @buf and @size are updated with
2192 * the amount of bytes written.
2193 */
2194 static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
2195 bool neg)
2196 {
2197 int len;
2198 char tmp[TMPBUFLEN], *p = tmp;
2199
2200 sprintf(p, "%s%lu", neg ? "-" : "", val);
2201 len = strlen(tmp);
2202 if (len > *size)
2203 len = *size;
2204 if (copy_to_user(*buf, tmp, len))
2205 return -EFAULT;
2206 *size -= len;
2207 *buf += len;
2208 return 0;
2209 }
2210 #undef TMPBUFLEN
2211
2212 static int proc_put_char(void __user **buf, size_t *size, char c)
2213 {
2214 if (*size) {
2215 char __user **buffer = (char __user **)buf;
2216 if (put_user(c, *buffer))
2217 return -EFAULT;
2218 (*size)--, (*buffer)++;
2219 *buf = *buffer;
2220 }
2221 return 0;
2222 }
2223
2224 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
2225 int *valp,
2226 int write, void *data)
2227 {
2228 if (write) {
2229 if (*negp) {
2230 if (*lvalp > (unsigned long) INT_MAX + 1)
2231 return -EINVAL;
2232 *valp = -*lvalp;
2233 } else {
2234 if (*lvalp > (unsigned long) INT_MAX)
2235 return -EINVAL;
2236 *valp = *lvalp;
2237 }
2238 } else {
2239 int val = *valp;
2240 if (val < 0) {
2241 *negp = true;
2242 *lvalp = -(unsigned long)val;
2243 } else {
2244 *negp = false;
2245 *lvalp = (unsigned long)val;
2246 }
2247 }
2248 return 0;
2249 }
2250
2251 static int do_proc_douintvec_conv(unsigned long *lvalp,
2252 unsigned int *valp,
2253 int write, void *data)
2254 {
2255 if (write) {
2256 if (*lvalp > UINT_MAX)
2257 return -EINVAL;
2258 *valp = *lvalp;
2259 } else {
2260 unsigned int val = *valp;
2261 *lvalp = (unsigned long)val;
2262 }
2263 return 0;
2264 }
2265
2266 static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
2267
2268 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
2269 int write, void __user *buffer,
2270 size_t *lenp, loff_t *ppos,
2271 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2272 int write, void *data),
2273 void *data)
2274 {
2275 int *i, vleft, first = 1, err = 0;
2276 size_t left;
2277 char *kbuf = NULL, *p;
2278
2279 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
2280 *lenp = 0;
2281 return 0;
2282 }
2283
2284 i = (int *) tbl_data;
2285 vleft = table->maxlen / sizeof(*i);
2286 left = *lenp;
2287
2288 if (!conv)
2289 conv = do_proc_dointvec_conv;
2290
2291 if (write) {
2292 if (proc_first_pos_non_zero_ignore(ppos, table))
2293 goto out;
2294
2295 if (left > PAGE_SIZE - 1)
2296 left = PAGE_SIZE - 1;
2297 p = kbuf = memdup_user_nul(buffer, left);
2298 if (IS_ERR(kbuf))
2299 return PTR_ERR(kbuf);
2300 }
2301
2302 for (; left && vleft--; i++, first=0) {
2303 unsigned long lval;
2304 bool neg;
2305
2306 if (write) {
2307 left -= proc_skip_spaces(&p);
2308
2309 if (!left)
2310 break;
2311 err = proc_get_long(&p, &left, &lval, &neg,
2312 proc_wspace_sep,
2313 sizeof(proc_wspace_sep), NULL);
2314 if (err)
2315 break;
2316 if (conv(&neg, &lval, i, 1, data)) {
2317 err = -EINVAL;
2318 break;
2319 }
2320 } else {
2321 if (conv(&neg, &lval, i, 0, data)) {
2322 err = -EINVAL;
2323 break;
2324 }
2325 if (!first)
2326 err = proc_put_char(&buffer, &left, '\t');
2327 if (err)
2328 break;
2329 err = proc_put_long(&buffer, &left, lval, neg);
2330 if (err)
2331 break;
2332 }
2333 }
2334
2335 if (!write && !first && left && !err)
2336 err = proc_put_char(&buffer, &left, '\n');
2337 if (write && !err && left)
2338 left -= proc_skip_spaces(&p);
2339 if (write) {
2340 kfree(kbuf);
2341 if (first)
2342 return err ? : -EINVAL;
2343 }
2344 *lenp -= left;
2345 out:
2346 *ppos += *lenp;
2347 return err;
2348 }
2349
2350 static int do_proc_dointvec(struct ctl_table *table, int write,
2351 void __user *buffer, size_t *lenp, loff_t *ppos,
2352 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2353 int write, void *data),
2354 void *data)
2355 {
2356 return __do_proc_dointvec(table->data, table, write,
2357 buffer, lenp, ppos, conv, data);
2358 }
2359
2360 static int do_proc_douintvec_w(unsigned int *tbl_data,
2361 struct ctl_table *table,
2362 void __user *buffer,
2363 size_t *lenp, loff_t *ppos,
2364 int (*conv)(unsigned long *lvalp,
2365 unsigned int *valp,
2366 int write, void *data),
2367 void *data)
2368 {
2369 unsigned long lval;
2370 int err = 0;
2371 size_t left;
2372 bool neg;
2373 char *kbuf = NULL, *p;
2374
2375 left = *lenp;
2376
2377 if (proc_first_pos_non_zero_ignore(ppos, table))
2378 goto bail_early;
2379
2380 if (left > PAGE_SIZE - 1)
2381 left = PAGE_SIZE - 1;
2382
2383 p = kbuf = memdup_user_nul(buffer, left);
2384 if (IS_ERR(kbuf))
2385 return -EINVAL;
2386
2387 left -= proc_skip_spaces(&p);
2388 if (!left) {
2389 err = -EINVAL;
2390 goto out_free;
2391 }
2392
2393 err = proc_get_long(&p, &left, &lval, &neg,
2394 proc_wspace_sep,
2395 sizeof(proc_wspace_sep), NULL);
2396 if (err || neg) {
2397 err = -EINVAL;
2398 goto out_free;
2399 }
2400
2401 if (conv(&lval, tbl_data, 1, data)) {
2402 err = -EINVAL;
2403 goto out_free;
2404 }
2405
2406 if (!err && left)
2407 left -= proc_skip_spaces(&p);
2408
2409 out_free:
2410 kfree(kbuf);
2411 if (err)
2412 return -EINVAL;
2413
2414 return 0;
2415
2416 /* This is in keeping with old __do_proc_dointvec() */
2417 bail_early:
2418 *ppos += *lenp;
2419 return err;
2420 }
2421
2422 static int do_proc_douintvec_r(unsigned int *tbl_data, void __user *buffer,
2423 size_t *lenp, loff_t *ppos,
2424 int (*conv)(unsigned long *lvalp,
2425 unsigned int *valp,
2426 int write, void *data),
2427 void *data)
2428 {
2429 unsigned long lval;
2430 int err = 0;
2431 size_t left;
2432
2433 left = *lenp;
2434
2435 if (conv(&lval, tbl_data, 0, data)) {
2436 err = -EINVAL;
2437 goto out;
2438 }
2439
2440 err = proc_put_long(&buffer, &left, lval, false);
2441 if (err || !left)
2442 goto out;
2443
2444 err = proc_put_char(&buffer, &left, '\n');
2445
2446 out:
2447 *lenp -= left;
2448 *ppos += *lenp;
2449
2450 return err;
2451 }
2452
2453 static int __do_proc_douintvec(void *tbl_data, struct ctl_table *table,
2454 int write, void __user *buffer,
2455 size_t *lenp, loff_t *ppos,
2456 int (*conv)(unsigned long *lvalp,
2457 unsigned int *valp,
2458 int write, void *data),
2459 void *data)
2460 {
2461 unsigned int *i, vleft;
2462
2463 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
2464 *lenp = 0;
2465 return 0;
2466 }
2467
2468 i = (unsigned int *) tbl_data;
2469 vleft = table->maxlen / sizeof(*i);
2470
2471 /*
2472 * Arrays are not supported, keep this simple. *Do not* add
2473 * support for them.
2474 */
2475 if (vleft != 1) {
2476 *lenp = 0;
2477 return -EINVAL;
2478 }
2479
2480 if (!conv)
2481 conv = do_proc_douintvec_conv;
2482
2483 if (write)
2484 return do_proc_douintvec_w(i, table, buffer, lenp, ppos,
2485 conv, data);
2486 return do_proc_douintvec_r(i, buffer, lenp, ppos, conv, data);
2487 }
2488
2489 static int do_proc_douintvec(struct ctl_table *table, int write,
2490 void __user *buffer, size_t *lenp, loff_t *ppos,
2491 int (*conv)(unsigned long *lvalp,
2492 unsigned int *valp,
2493 int write, void *data),
2494 void *data)
2495 {
2496 return __do_proc_douintvec(table->data, table, write,
2497 buffer, lenp, ppos, conv, data);
2498 }
2499
2500 /**
2501 * proc_dointvec - read a vector of integers
2502 * @table: the sysctl table
2503 * @write: %TRUE if this is a write to the sysctl file
2504 * @buffer: the user buffer
2505 * @lenp: the size of the user buffer
2506 * @ppos: file position
2507 *
2508 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2509 * values from/to the user buffer, treated as an ASCII string.
2510 *
2511 * Returns 0 on success.
2512 */
2513 int proc_dointvec(struct ctl_table *table, int write,
2514 void __user *buffer, size_t *lenp, loff_t *ppos)
2515 {
2516 return do_proc_dointvec(table, write, buffer, lenp, ppos, NULL, NULL);
2517 }
2518
2519 /**
2520 * proc_douintvec - read a vector of unsigned integers
2521 * @table: the sysctl table
2522 * @write: %TRUE if this is a write to the sysctl file
2523 * @buffer: the user buffer
2524 * @lenp: the size of the user buffer
2525 * @ppos: file position
2526 *
2527 * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
2528 * values from/to the user buffer, treated as an ASCII string.
2529 *
2530 * Returns 0 on success.
2531 */
2532 int proc_douintvec(struct ctl_table *table, int write,
2533 void __user *buffer, size_t *lenp, loff_t *ppos)
2534 {
2535 return do_proc_douintvec(table, write, buffer, lenp, ppos,
2536 do_proc_douintvec_conv, NULL);
2537 }
2538
2539 /*
2540 * Taint values can only be increased
2541 * This means we can safely use a temporary.
2542 */
2543 static int proc_taint(struct ctl_table *table, int write,
2544 void __user *buffer, size_t *lenp, loff_t *ppos)
2545 {
2546 struct ctl_table t;
2547 unsigned long tmptaint = get_taint();
2548 int err;
2549
2550 if (write && !capable(CAP_SYS_ADMIN))
2551 return -EPERM;
2552
2553 t = *table;
2554 t.data = &tmptaint;
2555 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
2556 if (err < 0)
2557 return err;
2558
2559 if (write) {
2560 /*
2561 * Poor man's atomic or. Not worth adding a primitive
2562 * to everyone's atomic.h for this
2563 */
2564 int i;
2565 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2566 if ((tmptaint >> i) & 1)
2567 add_taint(i, LOCKDEP_STILL_OK);
2568 }
2569 }
2570
2571 return err;
2572 }
2573
2574 #ifdef CONFIG_PRINTK
2575 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
2576 void __user *buffer, size_t *lenp, loff_t *ppos)
2577 {
2578 if (write && !capable(CAP_SYS_ADMIN))
2579 return -EPERM;
2580
2581 return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2582 }
2583 #endif
2584
2585 struct do_proc_dointvec_minmax_conv_param {
2586 int *min;
2587 int *max;
2588 };
2589
2590 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
2591 int *valp,
2592 int write, void *data)
2593 {
2594 struct do_proc_dointvec_minmax_conv_param *param = data;
2595 if (write) {
2596 int val;
2597 if (*negp) {
2598 if (*lvalp > (unsigned long) INT_MAX + 1)
2599 return -EINVAL;
2600 val = -*lvalp;
2601 } else {
2602 if (*lvalp > (unsigned long) INT_MAX)
2603 return -EINVAL;
2604 val = *lvalp;
2605 }
2606 if ((param->min && *param->min > val) ||
2607 (param->max && *param->max < val))
2608 return -EINVAL;
2609 *valp = val;
2610 } else {
2611 int val = *valp;
2612 if (val < 0) {
2613 *negp = true;
2614 *lvalp = -(unsigned long)val;
2615 } else {
2616 *negp = false;
2617 *lvalp = (unsigned long)val;
2618 }
2619 }
2620 return 0;
2621 }
2622
2623 /**
2624 * proc_dointvec_minmax - read a vector of integers with min/max values
2625 * @table: the sysctl table
2626 * @write: %TRUE if this is a write to the sysctl file
2627 * @buffer: the user buffer
2628 * @lenp: the size of the user buffer
2629 * @ppos: file position
2630 *
2631 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2632 * values from/to the user buffer, treated as an ASCII string.
2633 *
2634 * This routine will ensure the values are within the range specified by
2635 * table->extra1 (min) and table->extra2 (max).
2636 *
2637 * Returns 0 on success.
2638 */
2639 int proc_dointvec_minmax(struct ctl_table *table, int write,
2640 void __user *buffer, size_t *lenp, loff_t *ppos)
2641 {
2642 struct do_proc_dointvec_minmax_conv_param param = {
2643 .min = (int *) table->extra1,
2644 .max = (int *) table->extra2,
2645 };
2646 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2647 do_proc_dointvec_minmax_conv, &param);
2648 }
2649
2650 struct do_proc_douintvec_minmax_conv_param {
2651 unsigned int *min;
2652 unsigned int *max;
2653 };
2654
2655 static int do_proc_douintvec_minmax_conv(unsigned long *lvalp,
2656 unsigned int *valp,
2657 int write, void *data)
2658 {
2659 struct do_proc_douintvec_minmax_conv_param *param = data;
2660
2661 if (write) {
2662 unsigned int val = *lvalp;
2663
2664 if ((param->min && *param->min > val) ||
2665 (param->max && *param->max < val))
2666 return -ERANGE;
2667
2668 if (*lvalp > UINT_MAX)
2669 return -EINVAL;
2670 *valp = val;
2671 } else {
2672 unsigned int val = *valp;
2673 *lvalp = (unsigned long) val;
2674 }
2675
2676 return 0;
2677 }
2678
2679 /**
2680 * proc_douintvec_minmax - read a vector of unsigned ints with min/max values
2681 * @table: the sysctl table
2682 * @write: %TRUE if this is a write to the sysctl file
2683 * @buffer: the user buffer
2684 * @lenp: the size of the user buffer
2685 * @ppos: file position
2686 *
2687 * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
2688 * values from/to the user buffer, treated as an ASCII string. Negative
2689 * strings are not allowed.
2690 *
2691 * This routine will ensure the values are within the range specified by
2692 * table->extra1 (min) and table->extra2 (max). There is a final sanity
2693 * check for UINT_MAX to avoid having to support wrap around uses from
2694 * userspace.
2695 *
2696 * Returns 0 on success.
2697 */
2698 int proc_douintvec_minmax(struct ctl_table *table, int write,
2699 void __user *buffer, size_t *lenp, loff_t *ppos)
2700 {
2701 struct do_proc_douintvec_minmax_conv_param param = {
2702 .min = (unsigned int *) table->extra1,
2703 .max = (unsigned int *) table->extra2,
2704 };
2705 return do_proc_douintvec(table, write, buffer, lenp, ppos,
2706 do_proc_douintvec_minmax_conv, &param);
2707 }
2708
2709 static void validate_coredump_safety(void)
2710 {
2711 #ifdef CONFIG_COREDUMP
2712 if (suid_dumpable == SUID_DUMP_ROOT &&
2713 core_pattern[0] != '/' && core_pattern[0] != '|') {
2714 printk(KERN_WARNING
2715 "Unsafe core_pattern used with fs.suid_dumpable=2.\n"
2716 "Pipe handler or fully qualified core dump path required.\n"
2717 "Set kernel.core_pattern before fs.suid_dumpable.\n"
2718 );
2719 }
2720 #endif
2721 }
2722
2723 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
2724 void __user *buffer, size_t *lenp, loff_t *ppos)
2725 {
2726 int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2727 if (!error)
2728 validate_coredump_safety();
2729 return error;
2730 }
2731
2732 #ifdef CONFIG_COREDUMP
2733 static int proc_dostring_coredump(struct ctl_table *table, int write,
2734 void __user *buffer, size_t *lenp, loff_t *ppos)
2735 {
2736 int error = proc_dostring(table, write, buffer, lenp, ppos);
2737 if (!error)
2738 validate_coredump_safety();
2739 return error;
2740 }
2741 #endif
2742
2743 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2744 void __user *buffer,
2745 size_t *lenp, loff_t *ppos,
2746 unsigned long convmul,
2747 unsigned long convdiv)
2748 {
2749 unsigned long *i, *min, *max;
2750 int vleft, first = 1, err = 0;
2751 size_t left;
2752 char *kbuf = NULL, *p;
2753
2754 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
2755 *lenp = 0;
2756 return 0;
2757 }
2758
2759 i = (unsigned long *) data;
2760 min = (unsigned long *) table->extra1;
2761 max = (unsigned long *) table->extra2;
2762 vleft = table->maxlen / sizeof(unsigned long);
2763 left = *lenp;
2764
2765 if (write) {
2766 if (proc_first_pos_non_zero_ignore(ppos, table))
2767 goto out;
2768
2769 if (left > PAGE_SIZE - 1)
2770 left = PAGE_SIZE - 1;
2771 p = kbuf = memdup_user_nul(buffer, left);
2772 if (IS_ERR(kbuf))
2773 return PTR_ERR(kbuf);
2774 }
2775
2776 for (; left && vleft--; i++, first = 0) {
2777 unsigned long val;
2778
2779 if (write) {
2780 bool neg;
2781
2782 left -= proc_skip_spaces(&p);
2783 if (!left)
2784 break;
2785
2786 err = proc_get_long(&p, &left, &val, &neg,
2787 proc_wspace_sep,
2788 sizeof(proc_wspace_sep), NULL);
2789 if (err)
2790 break;
2791 if (neg)
2792 continue;
2793 val = convmul * val / convdiv;
2794 if ((min && val < *min) || (max && val > *max))
2795 continue;
2796 *i = val;
2797 } else {
2798 val = convdiv * (*i) / convmul;
2799 if (!first) {
2800 err = proc_put_char(&buffer, &left, '\t');
2801 if (err)
2802 break;
2803 }
2804 err = proc_put_long(&buffer, &left, val, false);
2805 if (err)
2806 break;
2807 }
2808 }
2809
2810 if (!write && !first && left && !err)
2811 err = proc_put_char(&buffer, &left, '\n');
2812 if (write && !err)
2813 left -= proc_skip_spaces(&p);
2814 if (write) {
2815 kfree(kbuf);
2816 if (first)
2817 return err ? : -EINVAL;
2818 }
2819 *lenp -= left;
2820 out:
2821 *ppos += *lenp;
2822 return err;
2823 }
2824
2825 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2826 void __user *buffer,
2827 size_t *lenp, loff_t *ppos,
2828 unsigned long convmul,
2829 unsigned long convdiv)
2830 {
2831 return __do_proc_doulongvec_minmax(table->data, table, write,
2832 buffer, lenp, ppos, convmul, convdiv);
2833 }
2834
2835 /**
2836 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2837 * @table: the sysctl table
2838 * @write: %TRUE if this is a write to the sysctl file
2839 * @buffer: the user buffer
2840 * @lenp: the size of the user buffer
2841 * @ppos: file position
2842 *
2843 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2844 * values from/to the user buffer, treated as an ASCII string.
2845 *
2846 * This routine will ensure the values are within the range specified by
2847 * table->extra1 (min) and table->extra2 (max).
2848 *
2849 * Returns 0 on success.
2850 */
2851 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2852 void __user *buffer, size_t *lenp, loff_t *ppos)
2853 {
2854 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
2855 }
2856
2857 /**
2858 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2859 * @table: the sysctl table
2860 * @write: %TRUE if this is a write to the sysctl file
2861 * @buffer: the user buffer
2862 * @lenp: the size of the user buffer
2863 * @ppos: file position
2864 *
2865 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2866 * values from/to the user buffer, treated as an ASCII string. The values
2867 * are treated as milliseconds, and converted to jiffies when they are stored.
2868 *
2869 * This routine will ensure the values are within the range specified by
2870 * table->extra1 (min) and table->extra2 (max).
2871 *
2872 * Returns 0 on success.
2873 */
2874 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2875 void __user *buffer,
2876 size_t *lenp, loff_t *ppos)
2877 {
2878 return do_proc_doulongvec_minmax(table, write, buffer,
2879 lenp, ppos, HZ, 1000l);
2880 }
2881
2882
2883 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
2884 int *valp,
2885 int write, void *data)
2886 {
2887 if (write) {
2888 if (*lvalp > INT_MAX / HZ)
2889 return 1;
2890 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2891 } else {
2892 int val = *valp;
2893 unsigned long lval;
2894 if (val < 0) {
2895 *negp = true;
2896 lval = -(unsigned long)val;
2897 } else {
2898 *negp = false;
2899 lval = (unsigned long)val;
2900 }
2901 *lvalp = lval / HZ;
2902 }
2903 return 0;
2904 }
2905
2906 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
2907 int *valp,
2908 int write, void *data)
2909 {
2910 if (write) {
2911 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2912 return 1;
2913 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2914 } else {
2915 int val = *valp;
2916 unsigned long lval;
2917 if (val < 0) {
2918 *negp = true;
2919 lval = -(unsigned long)val;
2920 } else {
2921 *negp = false;
2922 lval = (unsigned long)val;
2923 }
2924 *lvalp = jiffies_to_clock_t(lval);
2925 }
2926 return 0;
2927 }
2928
2929 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
2930 int *valp,
2931 int write, void *data)
2932 {
2933 if (write) {
2934 unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2935
2936 if (jif > INT_MAX)
2937 return 1;
2938 *valp = (int)jif;
2939 } else {
2940 int val = *valp;
2941 unsigned long lval;
2942 if (val < 0) {
2943 *negp = true;
2944 lval = -(unsigned long)val;
2945 } else {
2946 *negp = false;
2947 lval = (unsigned long)val;
2948 }
2949 *lvalp = jiffies_to_msecs(lval);
2950 }
2951 return 0;
2952 }
2953
2954 /**
2955 * proc_dointvec_jiffies - read a vector of integers as seconds
2956 * @table: the sysctl table
2957 * @write: %TRUE if this is a write to the sysctl file
2958 * @buffer: the user buffer
2959 * @lenp: the size of the user buffer
2960 * @ppos: file position
2961 *
2962 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2963 * values from/to the user buffer, treated as an ASCII string.
2964 * The values read are assumed to be in seconds, and are converted into
2965 * jiffies.
2966 *
2967 * Returns 0 on success.
2968 */
2969 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2970 void __user *buffer, size_t *lenp, loff_t *ppos)
2971 {
2972 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2973 do_proc_dointvec_jiffies_conv,NULL);
2974 }
2975
2976 /**
2977 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2978 * @table: the sysctl table
2979 * @write: %TRUE if this is a write to the sysctl file
2980 * @buffer: the user buffer
2981 * @lenp: the size of the user buffer
2982 * @ppos: pointer to the file position
2983 *
2984 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2985 * values from/to the user buffer, treated as an ASCII string.
2986 * The values read are assumed to be in 1/USER_HZ seconds, and
2987 * are converted into jiffies.
2988 *
2989 * Returns 0 on success.
2990 */
2991 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2992 void __user *buffer, size_t *lenp, loff_t *ppos)
2993 {
2994 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2995 do_proc_dointvec_userhz_jiffies_conv,NULL);
2996 }
2997
2998 /**
2999 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
3000 * @table: the sysctl table
3001 * @write: %TRUE if this is a write to the sysctl file
3002 * @buffer: the user buffer
3003 * @lenp: the size of the user buffer
3004 * @ppos: file position
3005 * @ppos: the current position in the file
3006 *
3007 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
3008 * values from/to the user buffer, treated as an ASCII string.
3009 * The values read are assumed to be in 1/1000 seconds, and
3010 * are converted into jiffies.
3011 *
3012 * Returns 0 on success.
3013 */
3014 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
3015 void __user *buffer, size_t *lenp, loff_t *ppos)
3016 {
3017 return do_proc_dointvec(table, write, buffer, lenp, ppos,
3018 do_proc_dointvec_ms_jiffies_conv, NULL);
3019 }
3020
3021 static int proc_do_cad_pid(struct ctl_table *table, int write,
3022 void __user *buffer, size_t *lenp, loff_t *ppos)
3023 {
3024 struct pid *new_pid;
3025 pid_t tmp;
3026 int r;
3027
3028 tmp = pid_vnr(cad_pid);
3029
3030 r = __do_proc_dointvec(&tmp, table, write, buffer,
3031 lenp, ppos, NULL, NULL);
3032 if (r || !write)
3033 return r;
3034
3035 new_pid = find_get_pid(tmp);
3036 if (!new_pid)
3037 return -ESRCH;
3038
3039 put_pid(xchg(&cad_pid, new_pid));
3040 return 0;
3041 }
3042
3043 /**
3044 * proc_do_large_bitmap - read/write from/to a large bitmap
3045 * @table: the sysctl table
3046 * @write: %TRUE if this is a write to the sysctl file
3047 * @buffer: the user buffer
3048 * @lenp: the size of the user buffer
3049 * @ppos: file position
3050 *
3051 * The bitmap is stored at table->data and the bitmap length (in bits)
3052 * in table->maxlen.
3053 *
3054 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
3055 * large bitmaps may be represented in a compact manner. Writing into
3056 * the file will clear the bitmap then update it with the given input.
3057 *
3058 * Returns 0 on success.
3059 */
3060 int proc_do_large_bitmap(struct ctl_table *table, int write,
3061 void __user *buffer, size_t *lenp, loff_t *ppos)
3062 {
3063 int err = 0;
3064 bool first = 1;
3065 size_t left = *lenp;
3066 unsigned long bitmap_len = table->maxlen;
3067 unsigned long *bitmap = *(unsigned long **) table->data;
3068 unsigned long *tmp_bitmap = NULL;
3069 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
3070
3071 if (!bitmap || !bitmap_len || !left || (*ppos && !write)) {
3072 *lenp = 0;
3073 return 0;
3074 }
3075
3076 if (write) {
3077 char *kbuf, *p;
3078
3079 if (left > PAGE_SIZE - 1)
3080 left = PAGE_SIZE - 1;
3081
3082 p = kbuf = memdup_user_nul(buffer, left);
3083 if (IS_ERR(kbuf))
3084 return PTR_ERR(kbuf);
3085
3086 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long),
3087 GFP_KERNEL);
3088 if (!tmp_bitmap) {
3089 kfree(kbuf);
3090 return -ENOMEM;
3091 }
3092 proc_skip_char(&p, &left, '\n');
3093 while (!err && left) {
3094 unsigned long val_a, val_b;
3095 bool neg;
3096
3097 err = proc_get_long(&p, &left, &val_a, &neg, tr_a,
3098 sizeof(tr_a), &c);
3099 if (err)
3100 break;
3101 if (val_a >= bitmap_len || neg) {
3102 err = -EINVAL;
3103 break;
3104 }
3105
3106 val_b = val_a;
3107 if (left) {
3108 p++;
3109 left--;
3110 }
3111
3112 if (c == '-') {
3113 err = proc_get_long(&p, &left, &val_b,
3114 &neg, tr_b, sizeof(tr_b),
3115 &c);
3116 if (err)
3117 break;
3118 if (val_b >= bitmap_len || neg ||
3119 val_a > val_b) {
3120 err = -EINVAL;
3121 break;
3122 }
3123 if (left) {
3124 p++;
3125 left--;
3126 }
3127 }
3128
3129 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
3130 first = 0;
3131 proc_skip_char(&p, &left, '\n');
3132 }
3133 kfree(kbuf);
3134 } else {
3135 unsigned long bit_a, bit_b = 0;
3136
3137 while (left) {
3138 bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
3139 if (bit_a >= bitmap_len)
3140 break;
3141 bit_b = find_next_zero_bit(bitmap, bitmap_len,
3142 bit_a + 1) - 1;
3143
3144 if (!first) {
3145 err = proc_put_char(&buffer, &left, ',');
3146 if (err)
3147 break;
3148 }
3149 err = proc_put_long(&buffer, &left, bit_a, false);
3150 if (err)
3151 break;
3152 if (bit_a != bit_b) {
3153 err = proc_put_char(&buffer, &left, '-');
3154 if (err)
3155 break;
3156 err = proc_put_long(&buffer, &left, bit_b, false);
3157 if (err)
3158 break;
3159 }
3160
3161 first = 0; bit_b++;
3162 }
3163 if (!err)
3164 err = proc_put_char(&buffer, &left, '\n');
3165 }
3166
3167 if (!err) {
3168 if (write) {
3169 if (*ppos)
3170 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
3171 else
3172 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
3173 }
3174 kfree(tmp_bitmap);
3175 *lenp -= left;
3176 *ppos += *lenp;
3177 return 0;
3178 } else {
3179 kfree(tmp_bitmap);
3180 return err;
3181 }
3182 }
3183
3184 #else /* CONFIG_PROC_SYSCTL */
3185
3186 int proc_dostring(struct ctl_table *table, int write,
3187 void __user *buffer, size_t *lenp, loff_t *ppos)
3188 {
3189 return -ENOSYS;
3190 }
3191
3192 int proc_dointvec(struct ctl_table *table, int write,
3193 void __user *buffer, size_t *lenp, loff_t *ppos)
3194 {
3195 return -ENOSYS;
3196 }
3197
3198 int proc_douintvec(struct ctl_table *table, int write,
3199 void __user *buffer, size_t *lenp, loff_t *ppos)
3200 {
3201 return -ENOSYS;
3202 }
3203
3204 int proc_dointvec_minmax(struct ctl_table *table, int write,
3205 void __user *buffer, size_t *lenp, loff_t *ppos)
3206 {
3207 return -ENOSYS;
3208 }
3209
3210 int proc_douintvec_minmax(struct ctl_table *table, int write,
3211 void __user *buffer, size_t *lenp, loff_t *ppos)
3212 {
3213 return -ENOSYS;
3214 }
3215
3216 int proc_dointvec_jiffies(struct ctl_table *table, int write,
3217 void __user *buffer, size_t *lenp, loff_t *ppos)
3218 {
3219 return -ENOSYS;
3220 }
3221
3222 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
3223 void __user *buffer, size_t *lenp, loff_t *ppos)
3224 {
3225 return -ENOSYS;
3226 }
3227
3228 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
3229 void __user *buffer, size_t *lenp, loff_t *ppos)
3230 {
3231 return -ENOSYS;
3232 }
3233
3234 int proc_doulongvec_minmax(struct ctl_table *table, int write,
3235 void __user *buffer, size_t *lenp, loff_t *ppos)
3236 {
3237 return -ENOSYS;
3238 }
3239
3240 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
3241 void __user *buffer,
3242 size_t *lenp, loff_t *ppos)
3243 {
3244 return -ENOSYS;
3245 }
3246
3247
3248 #endif /* CONFIG_PROC_SYSCTL */
3249
3250 /*
3251 * No sense putting this after each symbol definition, twice,
3252 * exception granted :-)
3253 */
3254 EXPORT_SYMBOL(proc_dointvec);
3255 EXPORT_SYMBOL(proc_douintvec);
3256 EXPORT_SYMBOL(proc_dointvec_jiffies);
3257 EXPORT_SYMBOL(proc_dointvec_minmax);
3258 EXPORT_SYMBOL_GPL(proc_douintvec_minmax);
3259 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
3260 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
3261 EXPORT_SYMBOL(proc_dostring);
3262 EXPORT_SYMBOL(proc_doulongvec_minmax);
3263 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
Motorola kernel-slsi