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block: avoid ordered task state change for polled IO
[linux/fpc-iii.git] / kernel / sysctl.c
blob5fc724e4e454c3304ecaebe7c868eb622f784eb8
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 #ifdef CONFIG_STACKLEAK_RUNTIME_DISABLE
94 #include <linux/stackleak.h>
95 #endif
96 #ifdef CONFIG_LOCKUP_DETECTOR
97 #include <linux/nmi.h>
98 #endif
99
100 #if defined(CONFIG_SYSCTL)
101
102 /* External variables not in a header file. */
103 extern int suid_dumpable;
104 #ifdef CONFIG_COREDUMP
105 extern int core_uses_pid;
106 extern char core_pattern[];
107 extern unsigned int core_pipe_limit;
108 #endif
109 extern int pid_max;
110 extern int pid_max_min, pid_max_max;
111 extern int percpu_pagelist_fraction;
112 extern int latencytop_enabled;
113 extern unsigned int sysctl_nr_open_min, sysctl_nr_open_max;
114 #ifndef CONFIG_MMU
115 extern int sysctl_nr_trim_pages;
116 #endif
117
118 /* Constants used for minimum and maximum */
119 #ifdef CONFIG_LOCKUP_DETECTOR
120 static int sixty = 60;
121 #endif
122
123 static int __maybe_unused neg_one = -1;
124
125 static int zero;
126 static int __maybe_unused one = 1;
127 static int __maybe_unused two = 2;
128 static int __maybe_unused four = 4;
129 static unsigned long one_ul = 1;
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 /*
150 * This is needed for proc_doulongvec_minmax of sysctl_hung_task_timeout_secs
151 * and hung_task_check_interval_secs
152 */
153 #ifdef CONFIG_DETECT_HUNG_TASK
154 static unsigned long hung_task_timeout_max = (LONG_MAX/HZ);
155 #endif
156
157 #ifdef CONFIG_INOTIFY_USER
158 #include <linux/inotify.h>
159 #endif
160 #ifdef CONFIG_SPARC
161 #endif
162
163 #ifdef __hppa__
164 extern int pwrsw_enabled;
165 #endif
166
167 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
168 extern int unaligned_enabled;
169 #endif
170
171 #ifdef CONFIG_IA64
172 extern int unaligned_dump_stack;
173 #endif
174
175 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
176 extern int no_unaligned_warning;
177 #endif
178
179 #ifdef CONFIG_PROC_SYSCTL
180
181 /**
182 * enum sysctl_writes_mode - supported sysctl write modes
183 *
184 * @SYSCTL_WRITES_LEGACY: each write syscall must fully contain the sysctl value
185 * to be written, and multiple writes on the same sysctl file descriptor
186 * will rewrite the sysctl value, regardless of file position. No warning
187 * is issued when the initial position is not 0.
188 * @SYSCTL_WRITES_WARN: same as above but warn when the initial file position is
189 * not 0.
190 * @SYSCTL_WRITES_STRICT: writes to numeric sysctl entries must always be at
191 * file position 0 and the value must be fully contained in the buffer
192 * sent to the write syscall. If dealing with strings respect the file
193 * position, but restrict this to the max length of the buffer, anything
194 * passed the max lenght will be ignored. Multiple writes will append
195 * to the buffer.
196 *
197 * These write modes control how current file position affects the behavior of
198 * updating sysctl values through the proc interface on each write.
199 */
200 enum sysctl_writes_mode {
201 SYSCTL_WRITES_LEGACY = -1,
202 SYSCTL_WRITES_WARN = 0,
203 SYSCTL_WRITES_STRICT = 1,
204 };
205
206 static enum sysctl_writes_mode sysctl_writes_strict = SYSCTL_WRITES_STRICT;
207
208 static int proc_do_cad_pid(struct ctl_table *table, int write,
209 void __user *buffer, size_t *lenp, loff_t *ppos);
210 static int proc_taint(struct ctl_table *table, int write,
211 void __user *buffer, size_t *lenp, loff_t *ppos);
212 #endif
213
214 #ifdef CONFIG_PRINTK
215 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
216 void __user *buffer, size_t *lenp, loff_t *ppos);
217 #endif
218
219 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
220 void __user *buffer, size_t *lenp, loff_t *ppos);
221 #ifdef CONFIG_COREDUMP
222 static int proc_dostring_coredump(struct ctl_table *table, int write,
223 void __user *buffer, size_t *lenp, loff_t *ppos);
224 #endif
225 static int proc_dopipe_max_size(struct ctl_table *table, int write,
226 void __user *buffer, size_t *lenp, loff_t *ppos);
227
228 #ifdef CONFIG_MAGIC_SYSRQ
229 /* Note: sysrq code uses its own private copy */
230 static int __sysrq_enabled = CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE;
231
232 static int sysrq_sysctl_handler(struct ctl_table *table, int write,
233 void __user *buffer, size_t *lenp,
234 loff_t *ppos)
235 {
236 int error;
237
238 error = proc_dointvec(table, write, buffer, lenp, ppos);
239 if (error)
240 return error;
241
242 if (write)
243 sysrq_toggle_support(__sysrq_enabled);
244
245 return 0;
246 }
247
248 #endif
249
250 static struct ctl_table kern_table[];
251 static struct ctl_table vm_table[];
252 static struct ctl_table fs_table[];
253 static struct ctl_table debug_table[];
254 static struct ctl_table dev_table[];
255 extern struct ctl_table random_table[];
256 #ifdef CONFIG_EPOLL
257 extern struct ctl_table epoll_table[];
258 #endif
259
260 #ifdef CONFIG_FW_LOADER_USER_HELPER
261 extern struct ctl_table firmware_config_table[];
262 #endif
263
264 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
265 int sysctl_legacy_va_layout;
266 #endif
267
268 /* The default sysctl tables: */
269
270 static struct ctl_table sysctl_base_table[] = {
271 {
272 .procname = "kernel",
273 .mode = 0555,
274 .child = kern_table,
275 },
276 {
277 .procname = "vm",
278 .mode = 0555,
279 .child = vm_table,
280 },
281 {
282 .procname = "fs",
283 .mode = 0555,
284 .child = fs_table,
285 },
286 {
287 .procname = "debug",
288 .mode = 0555,
289 .child = debug_table,
290 },
291 {
292 .procname = "dev",
293 .mode = 0555,
294 .child = dev_table,
295 },
296 { }
297 };
298
299 #ifdef CONFIG_SCHED_DEBUG
300 static int min_sched_granularity_ns = 100000; /* 100 usecs */
301 static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */
302 static int min_wakeup_granularity_ns; /* 0 usecs */
303 static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */
304 #ifdef CONFIG_SMP
305 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
306 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
307 #endif /* CONFIG_SMP */
308 #endif /* CONFIG_SCHED_DEBUG */
309
310 #ifdef CONFIG_COMPACTION
311 static int min_extfrag_threshold;
312 static int max_extfrag_threshold = 1000;
313 #endif
314
315 static struct ctl_table kern_table[] = {
316 {
317 .procname = "sched_child_runs_first",
318 .data = &sysctl_sched_child_runs_first,
319 .maxlen = sizeof(unsigned int),
320 .mode = 0644,
321 .proc_handler = proc_dointvec,
322 },
323 #ifdef CONFIG_SCHED_DEBUG
324 {
325 .procname = "sched_min_granularity_ns",
326 .data = &sysctl_sched_min_granularity,
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 {
334 .procname = "sched_latency_ns",
335 .data = &sysctl_sched_latency,
336 .maxlen = sizeof(unsigned int),
337 .mode = 0644,
338 .proc_handler = sched_proc_update_handler,
339 .extra1 = &min_sched_granularity_ns,
340 .extra2 = &max_sched_granularity_ns,
341 },
342 {
343 .procname = "sched_wakeup_granularity_ns",
344 .data = &sysctl_sched_wakeup_granularity,
345 .maxlen = sizeof(unsigned int),
346 .mode = 0644,
347 .proc_handler = sched_proc_update_handler,
348 .extra1 = &min_wakeup_granularity_ns,
349 .extra2 = &max_wakeup_granularity_ns,
350 },
351 #ifdef CONFIG_SMP
352 {
353 .procname = "sched_tunable_scaling",
354 .data = &sysctl_sched_tunable_scaling,
355 .maxlen = sizeof(enum sched_tunable_scaling),
356 .mode = 0644,
357 .proc_handler = sched_proc_update_handler,
358 .extra1 = &min_sched_tunable_scaling,
359 .extra2 = &max_sched_tunable_scaling,
360 },
361 {
362 .procname = "sched_migration_cost_ns",
363 .data = &sysctl_sched_migration_cost,
364 .maxlen = sizeof(unsigned int),
365 .mode = 0644,
366 .proc_handler = proc_dointvec,
367 },
368 {
369 .procname = "sched_nr_migrate",
370 .data = &sysctl_sched_nr_migrate,
371 .maxlen = sizeof(unsigned int),
372 .mode = 0644,
373 .proc_handler = proc_dointvec,
374 },
375 #ifdef CONFIG_SCHEDSTATS
376 {
377 .procname = "sched_schedstats",
378 .data = NULL,
379 .maxlen = sizeof(unsigned int),
380 .mode = 0644,
381 .proc_handler = sysctl_schedstats,
382 .extra1 = &zero,
383 .extra2 = &one,
384 },
385 #endif /* CONFIG_SCHEDSTATS */
386 #endif /* CONFIG_SMP */
387 #ifdef CONFIG_NUMA_BALANCING
388 {
389 .procname = "numa_balancing_scan_delay_ms",
390 .data = &sysctl_numa_balancing_scan_delay,
391 .maxlen = sizeof(unsigned int),
392 .mode = 0644,
393 .proc_handler = proc_dointvec,
394 },
395 {
396 .procname = "numa_balancing_scan_period_min_ms",
397 .data = &sysctl_numa_balancing_scan_period_min,
398 .maxlen = sizeof(unsigned int),
399 .mode = 0644,
400 .proc_handler = proc_dointvec,
401 },
402 {
403 .procname = "numa_balancing_scan_period_max_ms",
404 .data = &sysctl_numa_balancing_scan_period_max,
405 .maxlen = sizeof(unsigned int),
406 .mode = 0644,
407 .proc_handler = proc_dointvec,
408 },
409 {
410 .procname = "numa_balancing_scan_size_mb",
411 .data = &sysctl_numa_balancing_scan_size,
412 .maxlen = sizeof(unsigned int),
413 .mode = 0644,
414 .proc_handler = proc_dointvec_minmax,
415 .extra1 = &one,
416 },
417 {
418 .procname = "numa_balancing",
419 .data = NULL, /* filled in by handler */
420 .maxlen = sizeof(unsigned int),
421 .mode = 0644,
422 .proc_handler = sysctl_numa_balancing,
423 .extra1 = &zero,
424 .extra2 = &one,
425 },
426 #endif /* CONFIG_NUMA_BALANCING */
427 #endif /* CONFIG_SCHED_DEBUG */
428 {
429 .procname = "sched_rt_period_us",
430 .data = &sysctl_sched_rt_period,
431 .maxlen = sizeof(unsigned int),
432 .mode = 0644,
433 .proc_handler = sched_rt_handler,
434 },
435 {
436 .procname = "sched_rt_runtime_us",
437 .data = &sysctl_sched_rt_runtime,
438 .maxlen = sizeof(int),
439 .mode = 0644,
440 .proc_handler = sched_rt_handler,
441 },
442 {
443 .procname = "sched_rr_timeslice_ms",
444 .data = &sysctl_sched_rr_timeslice,
445 .maxlen = sizeof(int),
446 .mode = 0644,
447 .proc_handler = sched_rr_handler,
448 },
449 #ifdef CONFIG_SCHED_AUTOGROUP
450 {
451 .procname = "sched_autogroup_enabled",
452 .data = &sysctl_sched_autogroup_enabled,
453 .maxlen = sizeof(unsigned int),
454 .mode = 0644,
455 .proc_handler = proc_dointvec_minmax,
456 .extra1 = &zero,
457 .extra2 = &one,
458 },
459 #endif
460 #ifdef CONFIG_CFS_BANDWIDTH
461 {
462 .procname = "sched_cfs_bandwidth_slice_us",
463 .data = &sysctl_sched_cfs_bandwidth_slice,
464 .maxlen = sizeof(unsigned int),
465 .mode = 0644,
466 .proc_handler = proc_dointvec_minmax,
467 .extra1 = &one,
468 },
469 #endif
470 #ifdef CONFIG_PROVE_LOCKING
471 {
472 .procname = "prove_locking",
473 .data = &prove_locking,
474 .maxlen = sizeof(int),
475 .mode = 0644,
476 .proc_handler = proc_dointvec,
477 },
478 #endif
479 #ifdef CONFIG_LOCK_STAT
480 {
481 .procname = "lock_stat",
482 .data = &lock_stat,
483 .maxlen = sizeof(int),
484 .mode = 0644,
485 .proc_handler = proc_dointvec,
486 },
487 #endif
488 {
489 .procname = "panic",
490 .data = &panic_timeout,
491 .maxlen = sizeof(int),
492 .mode = 0644,
493 .proc_handler = proc_dointvec,
494 },
495 #ifdef CONFIG_COREDUMP
496 {
497 .procname = "core_uses_pid",
498 .data = &core_uses_pid,
499 .maxlen = sizeof(int),
500 .mode = 0644,
501 .proc_handler = proc_dointvec,
502 },
503 {
504 .procname = "core_pattern",
505 .data = core_pattern,
506 .maxlen = CORENAME_MAX_SIZE,
507 .mode = 0644,
508 .proc_handler = proc_dostring_coredump,
509 },
510 {
511 .procname = "core_pipe_limit",
512 .data = &core_pipe_limit,
513 .maxlen = sizeof(unsigned int),
514 .mode = 0644,
515 .proc_handler = proc_dointvec,
516 },
517 #endif
518 #ifdef CONFIG_PROC_SYSCTL
519 {
520 .procname = "tainted",
521 .maxlen = sizeof(long),
522 .mode = 0644,
523 .proc_handler = proc_taint,
524 },
525 {
526 .procname = "sysctl_writes_strict",
527 .data = &sysctl_writes_strict,
528 .maxlen = sizeof(int),
529 .mode = 0644,
530 .proc_handler = proc_dointvec_minmax,
531 .extra1 = &neg_one,
532 .extra2 = &one,
533 },
534 #endif
535 #ifdef CONFIG_LATENCYTOP
536 {
537 .procname = "latencytop",
538 .data = &latencytop_enabled,
539 .maxlen = sizeof(int),
540 .mode = 0644,
541 .proc_handler = sysctl_latencytop,
542 },
543 #endif
544 #ifdef CONFIG_BLK_DEV_INITRD
545 {
546 .procname = "real-root-dev",
547 .data = &real_root_dev,
548 .maxlen = sizeof(int),
549 .mode = 0644,
550 .proc_handler = proc_dointvec,
551 },
552 #endif
553 {
554 .procname = "print-fatal-signals",
555 .data = &print_fatal_signals,
556 .maxlen = sizeof(int),
557 .mode = 0644,
558 .proc_handler = proc_dointvec,
559 },
560 #ifdef CONFIG_SPARC
561 {
562 .procname = "reboot-cmd",
563 .data = reboot_command,
564 .maxlen = 256,
565 .mode = 0644,
566 .proc_handler = proc_dostring,
567 },
568 {
569 .procname = "stop-a",
570 .data = &stop_a_enabled,
571 .maxlen = sizeof (int),
572 .mode = 0644,
573 .proc_handler = proc_dointvec,
574 },
575 {
576 .procname = "scons-poweroff",
577 .data = &scons_pwroff,
578 .maxlen = sizeof (int),
579 .mode = 0644,
580 .proc_handler = proc_dointvec,
581 },
582 #endif
583 #ifdef CONFIG_SPARC64
584 {
585 .procname = "tsb-ratio",
586 .data = &sysctl_tsb_ratio,
587 .maxlen = sizeof (int),
588 .mode = 0644,
589 .proc_handler = proc_dointvec,
590 },
591 #endif
592 #ifdef __hppa__
593 {
594 .procname = "soft-power",
595 .data = &pwrsw_enabled,
596 .maxlen = sizeof (int),
597 .mode = 0644,
598 .proc_handler = proc_dointvec,
599 },
600 #endif
601 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
602 {
603 .procname = "unaligned-trap",
604 .data = &unaligned_enabled,
605 .maxlen = sizeof (int),
606 .mode = 0644,
607 .proc_handler = proc_dointvec,
608 },
609 #endif
610 {
611 .procname = "ctrl-alt-del",
612 .data = &C_A_D,
613 .maxlen = sizeof(int),
614 .mode = 0644,
615 .proc_handler = proc_dointvec,
616 },
617 #ifdef CONFIG_FUNCTION_TRACER
618 {
619 .procname = "ftrace_enabled",
620 .data = &ftrace_enabled,
621 .maxlen = sizeof(int),
622 .mode = 0644,
623 .proc_handler = ftrace_enable_sysctl,
624 },
625 #endif
626 #ifdef CONFIG_STACK_TRACER
627 {
628 .procname = "stack_tracer_enabled",
629 .data = &stack_tracer_enabled,
630 .maxlen = sizeof(int),
631 .mode = 0644,
632 .proc_handler = stack_trace_sysctl,
633 },
634 #endif
635 #ifdef CONFIG_TRACING
636 {
637 .procname = "ftrace_dump_on_oops",
638 .data = &ftrace_dump_on_oops,
639 .maxlen = sizeof(int),
640 .mode = 0644,
641 .proc_handler = proc_dointvec,
642 },
643 {
644 .procname = "traceoff_on_warning",
645 .data = &__disable_trace_on_warning,
646 .maxlen = sizeof(__disable_trace_on_warning),
647 .mode = 0644,
648 .proc_handler = proc_dointvec,
649 },
650 {
651 .procname = "tracepoint_printk",
652 .data = &tracepoint_printk,
653 .maxlen = sizeof(tracepoint_printk),
654 .mode = 0644,
655 .proc_handler = tracepoint_printk_sysctl,
656 },
657 #endif
658 #ifdef CONFIG_KEXEC_CORE
659 {
660 .procname = "kexec_load_disabled",
661 .data = &kexec_load_disabled,
662 .maxlen = sizeof(int),
663 .mode = 0644,
664 /* only handle a transition from default "0" to "1" */
665 .proc_handler = proc_dointvec_minmax,
666 .extra1 = &one,
667 .extra2 = &one,
668 },
669 #endif
670 #ifdef CONFIG_MODULES
671 {
672 .procname = "modprobe",
673 .data = &modprobe_path,
674 .maxlen = KMOD_PATH_LEN,
675 .mode = 0644,
676 .proc_handler = proc_dostring,
677 },
678 {
679 .procname = "modules_disabled",
680 .data = &modules_disabled,
681 .maxlen = sizeof(int),
682 .mode = 0644,
683 /* only handle a transition from default "0" to "1" */
684 .proc_handler = proc_dointvec_minmax,
685 .extra1 = &one,
686 .extra2 = &one,
687 },
688 #endif
689 #ifdef CONFIG_UEVENT_HELPER
690 {
691 .procname = "hotplug",
692 .data = &uevent_helper,
693 .maxlen = UEVENT_HELPER_PATH_LEN,
694 .mode = 0644,
695 .proc_handler = proc_dostring,
696 },
697 #endif
698 #ifdef CONFIG_CHR_DEV_SG
699 {
700 .procname = "sg-big-buff",
701 .data = &sg_big_buff,
702 .maxlen = sizeof (int),
703 .mode = 0444,
704 .proc_handler = proc_dointvec,
705 },
706 #endif
707 #ifdef CONFIG_BSD_PROCESS_ACCT
708 {
709 .procname = "acct",
710 .data = &acct_parm,
711 .maxlen = 3*sizeof(int),
712 .mode = 0644,
713 .proc_handler = proc_dointvec,
714 },
715 #endif
716 #ifdef CONFIG_MAGIC_SYSRQ
717 {
718 .procname = "sysrq",
719 .data = &__sysrq_enabled,
720 .maxlen = sizeof (int),
721 .mode = 0644,
722 .proc_handler = sysrq_sysctl_handler,
723 },
724 #endif
725 #ifdef CONFIG_PROC_SYSCTL
726 {
727 .procname = "cad_pid",
728 .data = NULL,
729 .maxlen = sizeof (int),
730 .mode = 0600,
731 .proc_handler = proc_do_cad_pid,
732 },
733 #endif
734 {
735 .procname = "threads-max",
736 .data = NULL,
737 .maxlen = sizeof(int),
738 .mode = 0644,
739 .proc_handler = sysctl_max_threads,
740 },
741 {
742 .procname = "random",
743 .mode = 0555,
744 .child = random_table,
745 },
746 {
747 .procname = "usermodehelper",
748 .mode = 0555,
749 .child = usermodehelper_table,
750 },
751 #ifdef CONFIG_FW_LOADER_USER_HELPER
752 {
753 .procname = "firmware_config",
754 .mode = 0555,
755 .child = firmware_config_table,
756 },
757 #endif
758 {
759 .procname = "overflowuid",
760 .data = &overflowuid,
761 .maxlen = sizeof(int),
762 .mode = 0644,
763 .proc_handler = proc_dointvec_minmax,
764 .extra1 = &minolduid,
765 .extra2 = &maxolduid,
766 },
767 {
768 .procname = "overflowgid",
769 .data = &overflowgid,
770 .maxlen = sizeof(int),
771 .mode = 0644,
772 .proc_handler = proc_dointvec_minmax,
773 .extra1 = &minolduid,
774 .extra2 = &maxolduid,
775 },
776 #ifdef CONFIG_S390
777 #ifdef CONFIG_MATHEMU
778 {
779 .procname = "ieee_emulation_warnings",
780 .data = &sysctl_ieee_emulation_warnings,
781 .maxlen = sizeof(int),
782 .mode = 0644,
783 .proc_handler = proc_dointvec,
784 },
785 #endif
786 {
787 .procname = "userprocess_debug",
788 .data = &show_unhandled_signals,
789 .maxlen = sizeof(int),
790 .mode = 0644,
791 .proc_handler = proc_dointvec,
792 },
793 #endif
794 {
795 .procname = "pid_max",
796 .data = &pid_max,
797 .maxlen = sizeof (int),
798 .mode = 0644,
799 .proc_handler = proc_dointvec_minmax,
800 .extra1 = &pid_max_min,
801 .extra2 = &pid_max_max,
802 },
803 {
804 .procname = "panic_on_oops",
805 .data = &panic_on_oops,
806 .maxlen = sizeof(int),
807 .mode = 0644,
808 .proc_handler = proc_dointvec,
809 },
810 #if defined CONFIG_PRINTK
811 {
812 .procname = "printk",
813 .data = &console_loglevel,
814 .maxlen = 4*sizeof(int),
815 .mode = 0644,
816 .proc_handler = proc_dointvec,
817 },
818 {
819 .procname = "printk_ratelimit",
820 .data = &printk_ratelimit_state.interval,
821 .maxlen = sizeof(int),
822 .mode = 0644,
823 .proc_handler = proc_dointvec_jiffies,
824 },
825 {
826 .procname = "printk_ratelimit_burst",
827 .data = &printk_ratelimit_state.burst,
828 .maxlen = sizeof(int),
829 .mode = 0644,
830 .proc_handler = proc_dointvec,
831 },
832 {
833 .procname = "printk_delay",
834 .data = &printk_delay_msec,
835 .maxlen = sizeof(int),
836 .mode = 0644,
837 .proc_handler = proc_dointvec_minmax,
838 .extra1 = &zero,
839 .extra2 = &ten_thousand,
840 },
841 {
842 .procname = "printk_devkmsg",
843 .data = devkmsg_log_str,
844 .maxlen = DEVKMSG_STR_MAX_SIZE,
845 .mode = 0644,
846 .proc_handler = devkmsg_sysctl_set_loglvl,
847 },
848 {
849 .procname = "dmesg_restrict",
850 .data = &dmesg_restrict,
851 .maxlen = sizeof(int),
852 .mode = 0644,
853 .proc_handler = proc_dointvec_minmax_sysadmin,
854 .extra1 = &zero,
855 .extra2 = &one,
856 },
857 {
858 .procname = "kptr_restrict",
859 .data = &kptr_restrict,
860 .maxlen = sizeof(int),
861 .mode = 0644,
862 .proc_handler = proc_dointvec_minmax_sysadmin,
863 .extra1 = &zero,
864 .extra2 = &two,
865 },
866 #endif
867 {
868 .procname = "ngroups_max",
869 .data = &ngroups_max,
870 .maxlen = sizeof (int),
871 .mode = 0444,
872 .proc_handler = proc_dointvec,
873 },
874 {
875 .procname = "cap_last_cap",
876 .data = (void *)&cap_last_cap,
877 .maxlen = sizeof(int),
878 .mode = 0444,
879 .proc_handler = proc_dointvec,
880 },
881 #if defined(CONFIG_LOCKUP_DETECTOR)
882 {
883 .procname = "watchdog",
884 .data = &watchdog_user_enabled,
885 .maxlen = sizeof(int),
886 .mode = 0644,
887 .proc_handler = proc_watchdog,
888 .extra1 = &zero,
889 .extra2 = &one,
890 },
891 {
892 .procname = "watchdog_thresh",
893 .data = &watchdog_thresh,
894 .maxlen = sizeof(int),
895 .mode = 0644,
896 .proc_handler = proc_watchdog_thresh,
897 .extra1 = &zero,
898 .extra2 = &sixty,
899 },
900 {
901 .procname = "nmi_watchdog",
902 .data = &nmi_watchdog_user_enabled,
903 .maxlen = sizeof(int),
904 .mode = NMI_WATCHDOG_SYSCTL_PERM,
905 .proc_handler = proc_nmi_watchdog,
906 .extra1 = &zero,
907 .extra2 = &one,
908 },
909 {
910 .procname = "watchdog_cpumask",
911 .data = &watchdog_cpumask_bits,
912 .maxlen = NR_CPUS,
913 .mode = 0644,
914 .proc_handler = proc_watchdog_cpumask,
915 },
916 #ifdef CONFIG_SOFTLOCKUP_DETECTOR
917 {
918 .procname = "soft_watchdog",
919 .data = &soft_watchdog_user_enabled,
920 .maxlen = sizeof(int),
921 .mode = 0644,
922 .proc_handler = proc_soft_watchdog,
923 .extra1 = &zero,
924 .extra2 = &one,
925 },
926 {
927 .procname = "softlockup_panic",
928 .data = &softlockup_panic,
929 .maxlen = sizeof(int),
930 .mode = 0644,
931 .proc_handler = proc_dointvec_minmax,
932 .extra1 = &zero,
933 .extra2 = &one,
934 },
935 #ifdef CONFIG_SMP
936 {
937 .procname = "softlockup_all_cpu_backtrace",
938 .data = &sysctl_softlockup_all_cpu_backtrace,
939 .maxlen = sizeof(int),
940 .mode = 0644,
941 .proc_handler = proc_dointvec_minmax,
942 .extra1 = &zero,
943 .extra2 = &one,
944 },
945 #endif /* CONFIG_SMP */
946 #endif
947 #ifdef CONFIG_HARDLOCKUP_DETECTOR
948 {
949 .procname = "hardlockup_panic",
950 .data = &hardlockup_panic,
951 .maxlen = sizeof(int),
952 .mode = 0644,
953 .proc_handler = proc_dointvec_minmax,
954 .extra1 = &zero,
955 .extra2 = &one,
956 },
957 #ifdef CONFIG_SMP
958 {
959 .procname = "hardlockup_all_cpu_backtrace",
960 .data = &sysctl_hardlockup_all_cpu_backtrace,
961 .maxlen = sizeof(int),
962 .mode = 0644,
963 .proc_handler = proc_dointvec_minmax,
964 .extra1 = &zero,
965 .extra2 = &one,
966 },
967 #endif /* CONFIG_SMP */
968 #endif
969 #endif
970
971 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
972 {
973 .procname = "unknown_nmi_panic",
974 .data = &unknown_nmi_panic,
975 .maxlen = sizeof (int),
976 .mode = 0644,
977 .proc_handler = proc_dointvec,
978 },
979 #endif
980 #if defined(CONFIG_X86)
981 {
982 .procname = "panic_on_unrecovered_nmi",
983 .data = &panic_on_unrecovered_nmi,
984 .maxlen = sizeof(int),
985 .mode = 0644,
986 .proc_handler = proc_dointvec,
987 },
988 {
989 .procname = "panic_on_io_nmi",
990 .data = &panic_on_io_nmi,
991 .maxlen = sizeof(int),
992 .mode = 0644,
993 .proc_handler = proc_dointvec,
994 },
995 #ifdef CONFIG_DEBUG_STACKOVERFLOW
996 {
997 .procname = "panic_on_stackoverflow",
998 .data = &sysctl_panic_on_stackoverflow,
999 .maxlen = sizeof(int),
1000 .mode = 0644,
1001 .proc_handler = proc_dointvec,
1002 },
1003 #endif
1004 {
1005 .procname = "bootloader_type",
1006 .data = &bootloader_type,
1007 .maxlen = sizeof (int),
1008 .mode = 0444,
1009 .proc_handler = proc_dointvec,
1010 },
1011 {
1012 .procname = "bootloader_version",
1013 .data = &bootloader_version,
1014 .maxlen = sizeof (int),
1015 .mode = 0444,
1016 .proc_handler = proc_dointvec,
1017 },
1018 {
1019 .procname = "io_delay_type",
1020 .data = &io_delay_type,
1021 .maxlen = sizeof(int),
1022 .mode = 0644,
1023 .proc_handler = proc_dointvec,
1024 },
1025 #endif
1026 #if defined(CONFIG_MMU)
1027 {
1028 .procname = "randomize_va_space",
1029 .data = &randomize_va_space,
1030 .maxlen = sizeof(int),
1031 .mode = 0644,
1032 .proc_handler = proc_dointvec,
1033 },
1034 #endif
1035 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
1036 {
1037 .procname = "spin_retry",
1038 .data = &spin_retry,
1039 .maxlen = sizeof (int),
1040 .mode = 0644,
1041 .proc_handler = proc_dointvec,
1042 },
1043 #endif
1044 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
1045 {
1046 .procname = "acpi_video_flags",
1047 .data = &acpi_realmode_flags,
1048 .maxlen = sizeof (unsigned long),
1049 .mode = 0644,
1050 .proc_handler = proc_doulongvec_minmax,
1051 },
1052 #endif
1053 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
1054 {
1055 .procname = "ignore-unaligned-usertrap",
1056 .data = &no_unaligned_warning,
1057 .maxlen = sizeof (int),
1058 .mode = 0644,
1059 .proc_handler = proc_dointvec,
1060 },
1061 #endif
1062 #ifdef CONFIG_IA64
1063 {
1064 .procname = "unaligned-dump-stack",
1065 .data = &unaligned_dump_stack,
1066 .maxlen = sizeof (int),
1067 .mode = 0644,
1068 .proc_handler = proc_dointvec,
1069 },
1070 #endif
1071 #ifdef CONFIG_DETECT_HUNG_TASK
1072 {
1073 .procname = "hung_task_panic",
1074 .data = &sysctl_hung_task_panic,
1075 .maxlen = sizeof(int),
1076 .mode = 0644,
1077 .proc_handler = proc_dointvec_minmax,
1078 .extra1 = &zero,
1079 .extra2 = &one,
1080 },
1081 {
1082 .procname = "hung_task_check_count",
1083 .data = &sysctl_hung_task_check_count,
1084 .maxlen = sizeof(int),
1085 .mode = 0644,
1086 .proc_handler = proc_dointvec_minmax,
1087 .extra1 = &zero,
1088 },
1089 {
1090 .procname = "hung_task_timeout_secs",
1091 .data = &sysctl_hung_task_timeout_secs,
1092 .maxlen = sizeof(unsigned long),
1093 .mode = 0644,
1094 .proc_handler = proc_dohung_task_timeout_secs,
1095 .extra2 = &hung_task_timeout_max,
1096 },
1097 {
1098 .procname = "hung_task_check_interval_secs",
1099 .data = &sysctl_hung_task_check_interval_secs,
1100 .maxlen = sizeof(unsigned long),
1101 .mode = 0644,
1102 .proc_handler = proc_dohung_task_timeout_secs,
1103 .extra2 = &hung_task_timeout_max,
1104 },
1105 {
1106 .procname = "hung_task_warnings",
1107 .data = &sysctl_hung_task_warnings,
1108 .maxlen = sizeof(int),
1109 .mode = 0644,
1110 .proc_handler = proc_dointvec_minmax,
1111 .extra1 = &neg_one,
1112 },
1113 #endif
1114 #ifdef CONFIG_RT_MUTEXES
1115 {
1116 .procname = "max_lock_depth",
1117 .data = &max_lock_depth,
1118 .maxlen = sizeof(int),
1119 .mode = 0644,
1120 .proc_handler = proc_dointvec,
1121 },
1122 #endif
1123 {
1124 .procname = "poweroff_cmd",
1125 .data = &poweroff_cmd,
1126 .maxlen = POWEROFF_CMD_PATH_LEN,
1127 .mode = 0644,
1128 .proc_handler = proc_dostring,
1129 },
1130 #ifdef CONFIG_KEYS
1131 {
1132 .procname = "keys",
1133 .mode = 0555,
1134 .child = key_sysctls,
1135 },
1136 #endif
1137 #ifdef CONFIG_PERF_EVENTS
1138 /*
1139 * User-space scripts rely on the existence of this file
1140 * as a feature check for perf_events being enabled.
1141 *
1142 * So it's an ABI, do not remove!
1143 */
1144 {
1145 .procname = "perf_event_paranoid",
1146 .data = &sysctl_perf_event_paranoid,
1147 .maxlen = sizeof(sysctl_perf_event_paranoid),
1148 .mode = 0644,
1149 .proc_handler = proc_dointvec,
1150 },
1151 {
1152 .procname = "perf_event_mlock_kb",
1153 .data = &sysctl_perf_event_mlock,
1154 .maxlen = sizeof(sysctl_perf_event_mlock),
1155 .mode = 0644,
1156 .proc_handler = proc_dointvec,
1157 },
1158 {
1159 .procname = "perf_event_max_sample_rate",
1160 .data = &sysctl_perf_event_sample_rate,
1161 .maxlen = sizeof(sysctl_perf_event_sample_rate),
1162 .mode = 0644,
1163 .proc_handler = perf_proc_update_handler,
1164 .extra1 = &one,
1165 },
1166 {
1167 .procname = "perf_cpu_time_max_percent",
1168 .data = &sysctl_perf_cpu_time_max_percent,
1169 .maxlen = sizeof(sysctl_perf_cpu_time_max_percent),
1170 .mode = 0644,
1171 .proc_handler = perf_cpu_time_max_percent_handler,
1172 .extra1 = &zero,
1173 .extra2 = &one_hundred,
1174 },
1175 {
1176 .procname = "perf_event_max_stack",
1177 .data = &sysctl_perf_event_max_stack,
1178 .maxlen = sizeof(sysctl_perf_event_max_stack),
1179 .mode = 0644,
1180 .proc_handler = perf_event_max_stack_handler,
1181 .extra1 = &zero,
1182 .extra2 = &six_hundred_forty_kb,
1183 },
1184 {
1185 .procname = "perf_event_max_contexts_per_stack",
1186 .data = &sysctl_perf_event_max_contexts_per_stack,
1187 .maxlen = sizeof(sysctl_perf_event_max_contexts_per_stack),
1188 .mode = 0644,
1189 .proc_handler = perf_event_max_stack_handler,
1190 .extra1 = &zero,
1191 .extra2 = &one_thousand,
1192 },
1193 #endif
1194 {
1195 .procname = "panic_on_warn",
1196 .data = &panic_on_warn,
1197 .maxlen = sizeof(int),
1198 .mode = 0644,
1199 .proc_handler = proc_dointvec_minmax,
1200 .extra1 = &zero,
1201 .extra2 = &one,
1202 },
1203 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON)
1204 {
1205 .procname = "timer_migration",
1206 .data = &sysctl_timer_migration,
1207 .maxlen = sizeof(unsigned int),
1208 .mode = 0644,
1209 .proc_handler = timer_migration_handler,
1210 .extra1 = &zero,
1211 .extra2 = &one,
1212 },
1213 #endif
1214 #ifdef CONFIG_BPF_SYSCALL
1215 {
1216 .procname = "unprivileged_bpf_disabled",
1217 .data = &sysctl_unprivileged_bpf_disabled,
1218 .maxlen = sizeof(sysctl_unprivileged_bpf_disabled),
1219 .mode = 0644,
1220 /* only handle a transition from default "0" to "1" */
1221 .proc_handler = proc_dointvec_minmax,
1222 .extra1 = &one,
1223 .extra2 = &one,
1224 },
1225 #endif
1226 #if defined(CONFIG_TREE_RCU) || defined(CONFIG_PREEMPT_RCU)
1227 {
1228 .procname = "panic_on_rcu_stall",
1229 .data = &sysctl_panic_on_rcu_stall,
1230 .maxlen = sizeof(sysctl_panic_on_rcu_stall),
1231 .mode = 0644,
1232 .proc_handler = proc_dointvec_minmax,
1233 .extra1 = &zero,
1234 .extra2 = &one,
1235 },
1236 #endif
1237 #ifdef CONFIG_STACKLEAK_RUNTIME_DISABLE
1238 {
1239 .procname = "stack_erasing",
1240 .data = NULL,
1241 .maxlen = sizeof(int),
1242 .mode = 0600,
1243 .proc_handler = stack_erasing_sysctl,
1244 .extra1 = &zero,
1245 .extra2 = &one,
1246 },
1247 #endif
1248 { }
1249 };
1250
1251 static struct ctl_table vm_table[] = {
1252 {
1253 .procname = "overcommit_memory",
1254 .data = &sysctl_overcommit_memory,
1255 .maxlen = sizeof(sysctl_overcommit_memory),
1256 .mode = 0644,
1257 .proc_handler = proc_dointvec_minmax,
1258 .extra1 = &zero,
1259 .extra2 = &two,
1260 },
1261 {
1262 .procname = "panic_on_oom",
1263 .data = &sysctl_panic_on_oom,
1264 .maxlen = sizeof(sysctl_panic_on_oom),
1265 .mode = 0644,
1266 .proc_handler = proc_dointvec_minmax,
1267 .extra1 = &zero,
1268 .extra2 = &two,
1269 },
1270 {
1271 .procname = "oom_kill_allocating_task",
1272 .data = &sysctl_oom_kill_allocating_task,
1273 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
1274 .mode = 0644,
1275 .proc_handler = proc_dointvec,
1276 },
1277 {
1278 .procname = "oom_dump_tasks",
1279 .data = &sysctl_oom_dump_tasks,
1280 .maxlen = sizeof(sysctl_oom_dump_tasks),
1281 .mode = 0644,
1282 .proc_handler = proc_dointvec,
1283 },
1284 {
1285 .procname = "overcommit_ratio",
1286 .data = &sysctl_overcommit_ratio,
1287 .maxlen = sizeof(sysctl_overcommit_ratio),
1288 .mode = 0644,
1289 .proc_handler = overcommit_ratio_handler,
1290 },
1291 {
1292 .procname = "overcommit_kbytes",
1293 .data = &sysctl_overcommit_kbytes,
1294 .maxlen = sizeof(sysctl_overcommit_kbytes),
1295 .mode = 0644,
1296 .proc_handler = overcommit_kbytes_handler,
1297 },
1298 {
1299 .procname = "page-cluster",
1300 .data = &page_cluster,
1301 .maxlen = sizeof(int),
1302 .mode = 0644,
1303 .proc_handler = proc_dointvec_minmax,
1304 .extra1 = &zero,
1305 },
1306 {
1307 .procname = "dirty_background_ratio",
1308 .data = &dirty_background_ratio,
1309 .maxlen = sizeof(dirty_background_ratio),
1310 .mode = 0644,
1311 .proc_handler = dirty_background_ratio_handler,
1312 .extra1 = &zero,
1313 .extra2 = &one_hundred,
1314 },
1315 {
1316 .procname = "dirty_background_bytes",
1317 .data = &dirty_background_bytes,
1318 .maxlen = sizeof(dirty_background_bytes),
1319 .mode = 0644,
1320 .proc_handler = dirty_background_bytes_handler,
1321 .extra1 = &one_ul,
1322 },
1323 {
1324 .procname = "dirty_ratio",
1325 .data = &vm_dirty_ratio,
1326 .maxlen = sizeof(vm_dirty_ratio),
1327 .mode = 0644,
1328 .proc_handler = dirty_ratio_handler,
1329 .extra1 = &zero,
1330 .extra2 = &one_hundred,
1331 },
1332 {
1333 .procname = "dirty_bytes",
1334 .data = &vm_dirty_bytes,
1335 .maxlen = sizeof(vm_dirty_bytes),
1336 .mode = 0644,
1337 .proc_handler = dirty_bytes_handler,
1338 .extra1 = &dirty_bytes_min,
1339 },
1340 {
1341 .procname = "dirty_writeback_centisecs",
1342 .data = &dirty_writeback_interval,
1343 .maxlen = sizeof(dirty_writeback_interval),
1344 .mode = 0644,
1345 .proc_handler = dirty_writeback_centisecs_handler,
1346 },
1347 {
1348 .procname = "dirty_expire_centisecs",
1349 .data = &dirty_expire_interval,
1350 .maxlen = sizeof(dirty_expire_interval),
1351 .mode = 0644,
1352 .proc_handler = proc_dointvec_minmax,
1353 .extra1 = &zero,
1354 },
1355 {
1356 .procname = "dirtytime_expire_seconds",
1357 .data = &dirtytime_expire_interval,
1358 .maxlen = sizeof(dirtytime_expire_interval),
1359 .mode = 0644,
1360 .proc_handler = dirtytime_interval_handler,
1361 .extra1 = &zero,
1362 },
1363 {
1364 .procname = "swappiness",
1365 .data = &vm_swappiness,
1366 .maxlen = sizeof(vm_swappiness),
1367 .mode = 0644,
1368 .proc_handler = proc_dointvec_minmax,
1369 .extra1 = &zero,
1370 .extra2 = &one_hundred,
1371 },
1372 #ifdef CONFIG_HUGETLB_PAGE
1373 {
1374 .procname = "nr_hugepages",
1375 .data = NULL,
1376 .maxlen = sizeof(unsigned long),
1377 .mode = 0644,
1378 .proc_handler = hugetlb_sysctl_handler,
1379 },
1380 #ifdef CONFIG_NUMA
1381 {
1382 .procname = "nr_hugepages_mempolicy",
1383 .data = NULL,
1384 .maxlen = sizeof(unsigned long),
1385 .mode = 0644,
1386 .proc_handler = &hugetlb_mempolicy_sysctl_handler,
1387 },
1388 {
1389 .procname = "numa_stat",
1390 .data = &sysctl_vm_numa_stat,
1391 .maxlen = sizeof(int),
1392 .mode = 0644,
1393 .proc_handler = sysctl_vm_numa_stat_handler,
1394 .extra1 = &zero,
1395 .extra2 = &one,
1396 },
1397 #endif
1398 {
1399 .procname = "hugetlb_shm_group",
1400 .data = &sysctl_hugetlb_shm_group,
1401 .maxlen = sizeof(gid_t),
1402 .mode = 0644,
1403 .proc_handler = proc_dointvec,
1404 },
1405 {
1406 .procname = "nr_overcommit_hugepages",
1407 .data = NULL,
1408 .maxlen = sizeof(unsigned long),
1409 .mode = 0644,
1410 .proc_handler = hugetlb_overcommit_handler,
1411 },
1412 #endif
1413 {
1414 .procname = "lowmem_reserve_ratio",
1415 .data = &sysctl_lowmem_reserve_ratio,
1416 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1417 .mode = 0644,
1418 .proc_handler = lowmem_reserve_ratio_sysctl_handler,
1419 },
1420 {
1421 .procname = "drop_caches",
1422 .data = &sysctl_drop_caches,
1423 .maxlen = sizeof(int),
1424 .mode = 0644,
1425 .proc_handler = drop_caches_sysctl_handler,
1426 .extra1 = &one,
1427 .extra2 = &four,
1428 },
1429 #ifdef CONFIG_COMPACTION
1430 {
1431 .procname = "compact_memory",
1432 .data = &sysctl_compact_memory,
1433 .maxlen = sizeof(int),
1434 .mode = 0200,
1435 .proc_handler = sysctl_compaction_handler,
1436 },
1437 {
1438 .procname = "extfrag_threshold",
1439 .data = &sysctl_extfrag_threshold,
1440 .maxlen = sizeof(int),
1441 .mode = 0644,
1442 .proc_handler = sysctl_extfrag_handler,
1443 .extra1 = &min_extfrag_threshold,
1444 .extra2 = &max_extfrag_threshold,
1445 },
1446 {
1447 .procname = "compact_unevictable_allowed",
1448 .data = &sysctl_compact_unevictable_allowed,
1449 .maxlen = sizeof(int),
1450 .mode = 0644,
1451 .proc_handler = proc_dointvec,
1452 .extra1 = &zero,
1453 .extra2 = &one,
1454 },
1455
1456 #endif /* CONFIG_COMPACTION */
1457 {
1458 .procname = "min_free_kbytes",
1459 .data = &min_free_kbytes,
1460 .maxlen = sizeof(min_free_kbytes),
1461 .mode = 0644,
1462 .proc_handler = min_free_kbytes_sysctl_handler,
1463 .extra1 = &zero,
1464 },
1465 {
1466 .procname = "watermark_scale_factor",
1467 .data = &watermark_scale_factor,
1468 .maxlen = sizeof(watermark_scale_factor),
1469 .mode = 0644,
1470 .proc_handler = watermark_scale_factor_sysctl_handler,
1471 .extra1 = &one,
1472 .extra2 = &one_thousand,
1473 },
1474 {
1475 .procname = "percpu_pagelist_fraction",
1476 .data = &percpu_pagelist_fraction,
1477 .maxlen = sizeof(percpu_pagelist_fraction),
1478 .mode = 0644,
1479 .proc_handler = percpu_pagelist_fraction_sysctl_handler,
1480 .extra1 = &zero,
1481 },
1482 #ifdef CONFIG_MMU
1483 {
1484 .procname = "max_map_count",
1485 .data = &sysctl_max_map_count,
1486 .maxlen = sizeof(sysctl_max_map_count),
1487 .mode = 0644,
1488 .proc_handler = proc_dointvec_minmax,
1489 .extra1 = &zero,
1490 },
1491 #else
1492 {
1493 .procname = "nr_trim_pages",
1494 .data = &sysctl_nr_trim_pages,
1495 .maxlen = sizeof(sysctl_nr_trim_pages),
1496 .mode = 0644,
1497 .proc_handler = proc_dointvec_minmax,
1498 .extra1 = &zero,
1499 },
1500 #endif
1501 {
1502 .procname = "laptop_mode",
1503 .data = &laptop_mode,
1504 .maxlen = sizeof(laptop_mode),
1505 .mode = 0644,
1506 .proc_handler = proc_dointvec_jiffies,
1507 },
1508 {
1509 .procname = "block_dump",
1510 .data = &block_dump,
1511 .maxlen = sizeof(block_dump),
1512 .mode = 0644,
1513 .proc_handler = proc_dointvec,
1514 .extra1 = &zero,
1515 },
1516 {
1517 .procname = "vfs_cache_pressure",
1518 .data = &sysctl_vfs_cache_pressure,
1519 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1520 .mode = 0644,
1521 .proc_handler = proc_dointvec,
1522 .extra1 = &zero,
1523 },
1524 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1525 {
1526 .procname = "legacy_va_layout",
1527 .data = &sysctl_legacy_va_layout,
1528 .maxlen = sizeof(sysctl_legacy_va_layout),
1529 .mode = 0644,
1530 .proc_handler = proc_dointvec,
1531 .extra1 = &zero,
1532 },
1533 #endif
1534 #ifdef CONFIG_NUMA
1535 {
1536 .procname = "zone_reclaim_mode",
1537 .data = &node_reclaim_mode,
1538 .maxlen = sizeof(node_reclaim_mode),
1539 .mode = 0644,
1540 .proc_handler = proc_dointvec,
1541 .extra1 = &zero,
1542 },
1543 {
1544 .procname = "min_unmapped_ratio",
1545 .data = &sysctl_min_unmapped_ratio,
1546 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1547 .mode = 0644,
1548 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler,
1549 .extra1 = &zero,
1550 .extra2 = &one_hundred,
1551 },
1552 {
1553 .procname = "min_slab_ratio",
1554 .data = &sysctl_min_slab_ratio,
1555 .maxlen = sizeof(sysctl_min_slab_ratio),
1556 .mode = 0644,
1557 .proc_handler = sysctl_min_slab_ratio_sysctl_handler,
1558 .extra1 = &zero,
1559 .extra2 = &one_hundred,
1560 },
1561 #endif
1562 #ifdef CONFIG_SMP
1563 {
1564 .procname = "stat_interval",
1565 .data = &sysctl_stat_interval,
1566 .maxlen = sizeof(sysctl_stat_interval),
1567 .mode = 0644,
1568 .proc_handler = proc_dointvec_jiffies,
1569 },
1570 {
1571 .procname = "stat_refresh",
1572 .data = NULL,
1573 .maxlen = 0,
1574 .mode = 0600,
1575 .proc_handler = vmstat_refresh,
1576 },
1577 #endif
1578 #ifdef CONFIG_MMU
1579 {
1580 .procname = "mmap_min_addr",
1581 .data = &dac_mmap_min_addr,
1582 .maxlen = sizeof(unsigned long),
1583 .mode = 0644,
1584 .proc_handler = mmap_min_addr_handler,
1585 },
1586 #endif
1587 #ifdef CONFIG_NUMA
1588 {
1589 .procname = "numa_zonelist_order",
1590 .data = &numa_zonelist_order,
1591 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1592 .mode = 0644,
1593 .proc_handler = numa_zonelist_order_handler,
1594 },
1595 #endif
1596 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1597 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1598 {
1599 .procname = "vdso_enabled",
1600 #ifdef CONFIG_X86_32
1601 .data = &vdso32_enabled,
1602 .maxlen = sizeof(vdso32_enabled),
1603 #else
1604 .data = &vdso_enabled,
1605 .maxlen = sizeof(vdso_enabled),
1606 #endif
1607 .mode = 0644,
1608 .proc_handler = proc_dointvec,
1609 .extra1 = &zero,
1610 },
1611 #endif
1612 #ifdef CONFIG_HIGHMEM
1613 {
1614 .procname = "highmem_is_dirtyable",
1615 .data = &vm_highmem_is_dirtyable,
1616 .maxlen = sizeof(vm_highmem_is_dirtyable),
1617 .mode = 0644,
1618 .proc_handler = proc_dointvec_minmax,
1619 .extra1 = &zero,
1620 .extra2 = &one,
1621 },
1622 #endif
1623 #ifdef CONFIG_MEMORY_FAILURE
1624 {
1625 .procname = "memory_failure_early_kill",
1626 .data = &sysctl_memory_failure_early_kill,
1627 .maxlen = sizeof(sysctl_memory_failure_early_kill),
1628 .mode = 0644,
1629 .proc_handler = proc_dointvec_minmax,
1630 .extra1 = &zero,
1631 .extra2 = &one,
1632 },
1633 {
1634 .procname = "memory_failure_recovery",
1635 .data = &sysctl_memory_failure_recovery,
1636 .maxlen = sizeof(sysctl_memory_failure_recovery),
1637 .mode = 0644,
1638 .proc_handler = proc_dointvec_minmax,
1639 .extra1 = &zero,
1640 .extra2 = &one,
1641 },
1642 #endif
1643 {
1644 .procname = "user_reserve_kbytes",
1645 .data = &sysctl_user_reserve_kbytes,
1646 .maxlen = sizeof(sysctl_user_reserve_kbytes),
1647 .mode = 0644,
1648 .proc_handler = proc_doulongvec_minmax,
1649 },
1650 {
1651 .procname = "admin_reserve_kbytes",
1652 .data = &sysctl_admin_reserve_kbytes,
1653 .maxlen = sizeof(sysctl_admin_reserve_kbytes),
1654 .mode = 0644,
1655 .proc_handler = proc_doulongvec_minmax,
1656 },
1657 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS
1658 {
1659 .procname = "mmap_rnd_bits",
1660 .data = &mmap_rnd_bits,
1661 .maxlen = sizeof(mmap_rnd_bits),
1662 .mode = 0600,
1663 .proc_handler = proc_dointvec_minmax,
1664 .extra1 = (void *)&mmap_rnd_bits_min,
1665 .extra2 = (void *)&mmap_rnd_bits_max,
1666 },
1667 #endif
1668 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS
1669 {
1670 .procname = "mmap_rnd_compat_bits",
1671 .data = &mmap_rnd_compat_bits,
1672 .maxlen = sizeof(mmap_rnd_compat_bits),
1673 .mode = 0600,
1674 .proc_handler = proc_dointvec_minmax,
1675 .extra1 = (void *)&mmap_rnd_compat_bits_min,
1676 .extra2 = (void *)&mmap_rnd_compat_bits_max,
1677 },
1678 #endif
1679 { }
1680 };
1681
1682 static struct ctl_table fs_table[] = {
1683 {
1684 .procname = "inode-nr",
1685 .data = &inodes_stat,
1686 .maxlen = 2*sizeof(long),
1687 .mode = 0444,
1688 .proc_handler = proc_nr_inodes,
1689 },
1690 {
1691 .procname = "inode-state",
1692 .data = &inodes_stat,
1693 .maxlen = 7*sizeof(long),
1694 .mode = 0444,
1695 .proc_handler = proc_nr_inodes,
1696 },
1697 {
1698 .procname = "file-nr",
1699 .data = &files_stat,
1700 .maxlen = sizeof(files_stat),
1701 .mode = 0444,
1702 .proc_handler = proc_nr_files,
1703 },
1704 {
1705 .procname = "file-max",
1706 .data = &files_stat.max_files,
1707 .maxlen = sizeof(files_stat.max_files),
1708 .mode = 0644,
1709 .proc_handler = proc_doulongvec_minmax,
1710 },
1711 {
1712 .procname = "nr_open",
1713 .data = &sysctl_nr_open,
1714 .maxlen = sizeof(unsigned int),
1715 .mode = 0644,
1716 .proc_handler = proc_dointvec_minmax,
1717 .extra1 = &sysctl_nr_open_min,
1718 .extra2 = &sysctl_nr_open_max,
1719 },
1720 {
1721 .procname = "dentry-state",
1722 .data = &dentry_stat,
1723 .maxlen = 6*sizeof(long),
1724 .mode = 0444,
1725 .proc_handler = proc_nr_dentry,
1726 },
1727 {
1728 .procname = "overflowuid",
1729 .data = &fs_overflowuid,
1730 .maxlen = sizeof(int),
1731 .mode = 0644,
1732 .proc_handler = proc_dointvec_minmax,
1733 .extra1 = &minolduid,
1734 .extra2 = &maxolduid,
1735 },
1736 {
1737 .procname = "overflowgid",
1738 .data = &fs_overflowgid,
1739 .maxlen = sizeof(int),
1740 .mode = 0644,
1741 .proc_handler = proc_dointvec_minmax,
1742 .extra1 = &minolduid,
1743 .extra2 = &maxolduid,
1744 },
1745 #ifdef CONFIG_FILE_LOCKING
1746 {
1747 .procname = "leases-enable",
1748 .data = &leases_enable,
1749 .maxlen = sizeof(int),
1750 .mode = 0644,
1751 .proc_handler = proc_dointvec,
1752 },
1753 #endif
1754 #ifdef CONFIG_DNOTIFY
1755 {
1756 .procname = "dir-notify-enable",
1757 .data = &dir_notify_enable,
1758 .maxlen = sizeof(int),
1759 .mode = 0644,
1760 .proc_handler = proc_dointvec,
1761 },
1762 #endif
1763 #ifdef CONFIG_MMU
1764 #ifdef CONFIG_FILE_LOCKING
1765 {
1766 .procname = "lease-break-time",
1767 .data = &lease_break_time,
1768 .maxlen = sizeof(int),
1769 .mode = 0644,
1770 .proc_handler = proc_dointvec,
1771 },
1772 #endif
1773 #ifdef CONFIG_AIO
1774 {
1775 .procname = "aio-nr",
1776 .data = &aio_nr,
1777 .maxlen = sizeof(aio_nr),
1778 .mode = 0444,
1779 .proc_handler = proc_doulongvec_minmax,
1780 },
1781 {
1782 .procname = "aio-max-nr",
1783 .data = &aio_max_nr,
1784 .maxlen = sizeof(aio_max_nr),
1785 .mode = 0644,
1786 .proc_handler = proc_doulongvec_minmax,
1787 },
1788 #endif /* CONFIG_AIO */
1789 #ifdef CONFIG_INOTIFY_USER
1790 {
1791 .procname = "inotify",
1792 .mode = 0555,
1793 .child = inotify_table,
1794 },
1795 #endif
1796 #ifdef CONFIG_EPOLL
1797 {
1798 .procname = "epoll",
1799 .mode = 0555,
1800 .child = epoll_table,
1801 },
1802 #endif
1803 #endif
1804 {
1805 .procname = "protected_symlinks",
1806 .data = &sysctl_protected_symlinks,
1807 .maxlen = sizeof(int),
1808 .mode = 0600,
1809 .proc_handler = proc_dointvec_minmax,
1810 .extra1 = &zero,
1811 .extra2 = &one,
1812 },
1813 {
1814 .procname = "protected_hardlinks",
1815 .data = &sysctl_protected_hardlinks,
1816 .maxlen = sizeof(int),
1817 .mode = 0600,
1818 .proc_handler = proc_dointvec_minmax,
1819 .extra1 = &zero,
1820 .extra2 = &one,
1821 },
1822 {
1823 .procname = "protected_fifos",
1824 .data = &sysctl_protected_fifos,
1825 .maxlen = sizeof(int),
1826 .mode = 0600,
1827 .proc_handler = proc_dointvec_minmax,
1828 .extra1 = &zero,
1829 .extra2 = &two,
1830 },
1831 {
1832 .procname = "protected_regular",
1833 .data = &sysctl_protected_regular,
1834 .maxlen = sizeof(int),
1835 .mode = 0600,
1836 .proc_handler = proc_dointvec_minmax,
1837 .extra1 = &zero,
1838 .extra2 = &two,
1839 },
1840 {
1841 .procname = "suid_dumpable",
1842 .data = &suid_dumpable,
1843 .maxlen = sizeof(int),
1844 .mode = 0644,
1845 .proc_handler = proc_dointvec_minmax_coredump,
1846 .extra1 = &zero,
1847 .extra2 = &two,
1848 },
1849 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1850 {
1851 .procname = "binfmt_misc",
1852 .mode = 0555,
1853 .child = sysctl_mount_point,
1854 },
1855 #endif
1856 {
1857 .procname = "pipe-max-size",
1858 .data = &pipe_max_size,
1859 .maxlen = sizeof(pipe_max_size),
1860 .mode = 0644,
1861 .proc_handler = proc_dopipe_max_size,
1862 },
1863 {
1864 .procname = "pipe-user-pages-hard",
1865 .data = &pipe_user_pages_hard,
1866 .maxlen = sizeof(pipe_user_pages_hard),
1867 .mode = 0644,
1868 .proc_handler = proc_doulongvec_minmax,
1869 },
1870 {
1871 .procname = "pipe-user-pages-soft",
1872 .data = &pipe_user_pages_soft,
1873 .maxlen = sizeof(pipe_user_pages_soft),
1874 .mode = 0644,
1875 .proc_handler = proc_doulongvec_minmax,
1876 },
1877 {
1878 .procname = "mount-max",
1879 .data = &sysctl_mount_max,
1880 .maxlen = sizeof(unsigned int),
1881 .mode = 0644,
1882 .proc_handler = proc_dointvec_minmax,
1883 .extra1 = &one,
1884 },
1885 { }
1886 };
1887
1888 static struct ctl_table debug_table[] = {
1889 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
1890 {
1891 .procname = "exception-trace",
1892 .data = &show_unhandled_signals,
1893 .maxlen = sizeof(int),
1894 .mode = 0644,
1895 .proc_handler = proc_dointvec
1896 },
1897 #endif
1898 #if defined(CONFIG_OPTPROBES)
1899 {
1900 .procname = "kprobes-optimization",
1901 .data = &sysctl_kprobes_optimization,
1902 .maxlen = sizeof(int),
1903 .mode = 0644,
1904 .proc_handler = proc_kprobes_optimization_handler,
1905 .extra1 = &zero,
1906 .extra2 = &one,
1907 },
1908 #endif
1909 { }
1910 };
1911
1912 static struct ctl_table dev_table[] = {
1913 { }
1914 };
1915
1916 int __init sysctl_init(void)
1917 {
1918 struct ctl_table_header *hdr;
1919
1920 hdr = register_sysctl_table(sysctl_base_table);
1921 kmemleak_not_leak(hdr);
1922 return 0;
1923 }
1924
1925 #endif /* CONFIG_SYSCTL */
1926
1927 /*
1928 * /proc/sys support
1929 */
1930
1931 #ifdef CONFIG_PROC_SYSCTL
1932
1933 static int _proc_do_string(char *data, int maxlen, int write,
1934 char __user *buffer,
1935 size_t *lenp, loff_t *ppos)
1936 {
1937 size_t len;
1938 char __user *p;
1939 char c;
1940
1941 if (!data || !maxlen || !*lenp) {
1942 *lenp = 0;
1943 return 0;
1944 }
1945
1946 if (write) {
1947 if (sysctl_writes_strict == SYSCTL_WRITES_STRICT) {
1948 /* Only continue writes not past the end of buffer. */
1949 len = strlen(data);
1950 if (len > maxlen - 1)
1951 len = maxlen - 1;
1952
1953 if (*ppos > len)
1954 return 0;
1955 len = *ppos;
1956 } else {
1957 /* Start writing from beginning of buffer. */
1958 len = 0;
1959 }
1960
1961 *ppos += *lenp;
1962 p = buffer;
1963 while ((p - buffer) < *lenp && len < maxlen - 1) {
1964 if (get_user(c, p++))
1965 return -EFAULT;
1966 if (c == 0 || c == '\n')
1967 break;
1968 data[len++] = c;
1969 }
1970 data[len] = 0;
1971 } else {
1972 len = strlen(data);
1973 if (len > maxlen)
1974 len = maxlen;
1975
1976 if (*ppos > len) {
1977 *lenp = 0;
1978 return 0;
1979 }
1980
1981 data += *ppos;
1982 len -= *ppos;
1983
1984 if (len > *lenp)
1985 len = *lenp;
1986 if (len)
1987 if (copy_to_user(buffer, data, len))
1988 return -EFAULT;
1989 if (len < *lenp) {
1990 if (put_user('\n', buffer + len))
1991 return -EFAULT;
1992 len++;
1993 }
1994 *lenp = len;
1995 *ppos += len;
1996 }
1997 return 0;
1998 }
1999
2000 static void warn_sysctl_write(struct ctl_table *table)
2001 {
2002 pr_warn_once("%s wrote to %s when file position was not 0!\n"
2003 "This will not be supported in the future. To silence this\n"
2004 "warning, set kernel.sysctl_writes_strict = -1\n",
2005 current->comm, table->procname);
2006 }
2007
2008 /**
2009 * proc_first_pos_non_zero_ignore - check if first position is allowed
2010 * @ppos: file position
2011 * @table: the sysctl table
2012 *
2013 * Returns true if the first position is non-zero and the sysctl_writes_strict
2014 * mode indicates this is not allowed for numeric input types. String proc
2015 * handlers can ignore the return value.
2016 */
2017 static bool proc_first_pos_non_zero_ignore(loff_t *ppos,
2018 struct ctl_table *table)
2019 {
2020 if (!*ppos)
2021 return false;
2022
2023 switch (sysctl_writes_strict) {
2024 case SYSCTL_WRITES_STRICT:
2025 return true;
2026 case SYSCTL_WRITES_WARN:
2027 warn_sysctl_write(table);
2028 return false;
2029 default:
2030 return false;
2031 }
2032 }
2033
2034 /**
2035 * proc_dostring - read a string sysctl
2036 * @table: the sysctl table
2037 * @write: %TRUE if this is a write to the sysctl file
2038 * @buffer: the user buffer
2039 * @lenp: the size of the user buffer
2040 * @ppos: file position
2041 *
2042 * Reads/writes a string from/to the user buffer. If the kernel
2043 * buffer provided is not large enough to hold the string, the
2044 * string is truncated. The copied string is %NULL-terminated.
2045 * If the string is being read by the user process, it is copied
2046 * and a newline '\n' is added. It is truncated if the buffer is
2047 * not large enough.
2048 *
2049 * Returns 0 on success.
2050 */
2051 int proc_dostring(struct ctl_table *table, int write,
2052 void __user *buffer, size_t *lenp, loff_t *ppos)
2053 {
2054 if (write)
2055 proc_first_pos_non_zero_ignore(ppos, table);
2056
2057 return _proc_do_string((char *)(table->data), table->maxlen, write,
2058 (char __user *)buffer, lenp, ppos);
2059 }
2060
2061 static size_t proc_skip_spaces(char **buf)
2062 {
2063 size_t ret;
2064 char *tmp = skip_spaces(*buf);
2065 ret = tmp - *buf;
2066 *buf = tmp;
2067 return ret;
2068 }
2069
2070 static void proc_skip_char(char **buf, size_t *size, const char v)
2071 {
2072 while (*size) {
2073 if (**buf != v)
2074 break;
2075 (*size)--;
2076 (*buf)++;
2077 }
2078 }
2079
2080 #define TMPBUFLEN 22
2081 /**
2082 * proc_get_long - reads an ASCII formatted integer from a user buffer
2083 *
2084 * @buf: a kernel buffer
2085 * @size: size of the kernel buffer
2086 * @val: this is where the number will be stored
2087 * @neg: set to %TRUE if number is negative
2088 * @perm_tr: a vector which contains the allowed trailers
2089 * @perm_tr_len: size of the perm_tr vector
2090 * @tr: pointer to store the trailer character
2091 *
2092 * In case of success %0 is returned and @buf and @size are updated with
2093 * the amount of bytes read. If @tr is non-NULL and a trailing
2094 * character exists (size is non-zero after returning from this
2095 * function), @tr is updated with the trailing character.
2096 */
2097 static int proc_get_long(char **buf, size_t *size,
2098 unsigned long *val, bool *neg,
2099 const char *perm_tr, unsigned perm_tr_len, char *tr)
2100 {
2101 int len;
2102 char *p, tmp[TMPBUFLEN];
2103
2104 if (!*size)
2105 return -EINVAL;
2106
2107 len = *size;
2108 if (len > TMPBUFLEN - 1)
2109 len = TMPBUFLEN - 1;
2110
2111 memcpy(tmp, *buf, len);
2112
2113 tmp[len] = 0;
2114 p = tmp;
2115 if (*p == '-' && *size > 1) {
2116 *neg = true;
2117 p++;
2118 } else
2119 *neg = false;
2120 if (!isdigit(*p))
2121 return -EINVAL;
2122
2123 *val = simple_strtoul(p, &p, 0);
2124
2125 len = p - tmp;
2126
2127 /* We don't know if the next char is whitespace thus we may accept
2128 * invalid integers (e.g. 1234...a) or two integers instead of one
2129 * (e.g. 123...1). So lets not allow such large numbers. */
2130 if (len == TMPBUFLEN - 1)
2131 return -EINVAL;
2132
2133 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
2134 return -EINVAL;
2135
2136 if (tr && (len < *size))
2137 *tr = *p;
2138
2139 *buf += len;
2140 *size -= len;
2141
2142 return 0;
2143 }
2144
2145 /**
2146 * proc_put_long - converts an integer to a decimal ASCII formatted string
2147 *
2148 * @buf: the user buffer
2149 * @size: the size of the user buffer
2150 * @val: the integer to be converted
2151 * @neg: sign of the number, %TRUE for negative
2152 *
2153 * In case of success %0 is returned and @buf and @size are updated with
2154 * the amount of bytes written.
2155 */
2156 static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
2157 bool neg)
2158 {
2159 int len;
2160 char tmp[TMPBUFLEN], *p = tmp;
2161
2162 sprintf(p, "%s%lu", neg ? "-" : "", val);
2163 len = strlen(tmp);
2164 if (len > *size)
2165 len = *size;
2166 if (copy_to_user(*buf, tmp, len))
2167 return -EFAULT;
2168 *size -= len;
2169 *buf += len;
2170 return 0;
2171 }
2172 #undef TMPBUFLEN
2173
2174 static int proc_put_char(void __user **buf, size_t *size, char c)
2175 {
2176 if (*size) {
2177 char __user **buffer = (char __user **)buf;
2178 if (put_user(c, *buffer))
2179 return -EFAULT;
2180 (*size)--, (*buffer)++;
2181 *buf = *buffer;
2182 }
2183 return 0;
2184 }
2185
2186 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
2187 int *valp,
2188 int write, void *data)
2189 {
2190 if (write) {
2191 if (*negp) {
2192 if (*lvalp > (unsigned long) INT_MAX + 1)
2193 return -EINVAL;
2194 *valp = -*lvalp;
2195 } else {
2196 if (*lvalp > (unsigned long) INT_MAX)
2197 return -EINVAL;
2198 *valp = *lvalp;
2199 }
2200 } else {
2201 int val = *valp;
2202 if (val < 0) {
2203 *negp = true;
2204 *lvalp = -(unsigned long)val;
2205 } else {
2206 *negp = false;
2207 *lvalp = (unsigned long)val;
2208 }
2209 }
2210 return 0;
2211 }
2212
2213 static int do_proc_douintvec_conv(unsigned long *lvalp,
2214 unsigned int *valp,
2215 int write, void *data)
2216 {
2217 if (write) {
2218 if (*lvalp > UINT_MAX)
2219 return -EINVAL;
2220 *valp = *lvalp;
2221 } else {
2222 unsigned int val = *valp;
2223 *lvalp = (unsigned long)val;
2224 }
2225 return 0;
2226 }
2227
2228 static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
2229
2230 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
2231 int write, void __user *buffer,
2232 size_t *lenp, loff_t *ppos,
2233 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2234 int write, void *data),
2235 void *data)
2236 {
2237 int *i, vleft, first = 1, err = 0;
2238 size_t left;
2239 char *kbuf = NULL, *p;
2240
2241 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
2242 *lenp = 0;
2243 return 0;
2244 }
2245
2246 i = (int *) tbl_data;
2247 vleft = table->maxlen / sizeof(*i);
2248 left = *lenp;
2249
2250 if (!conv)
2251 conv = do_proc_dointvec_conv;
2252
2253 if (write) {
2254 if (proc_first_pos_non_zero_ignore(ppos, table))
2255 goto out;
2256
2257 if (left > PAGE_SIZE - 1)
2258 left = PAGE_SIZE - 1;
2259 p = kbuf = memdup_user_nul(buffer, left);
2260 if (IS_ERR(kbuf))
2261 return PTR_ERR(kbuf);
2262 }
2263
2264 for (; left && vleft--; i++, first=0) {
2265 unsigned long lval;
2266 bool neg;
2267
2268 if (write) {
2269 left -= proc_skip_spaces(&p);
2270
2271 if (!left)
2272 break;
2273 err = proc_get_long(&p, &left, &lval, &neg,
2274 proc_wspace_sep,
2275 sizeof(proc_wspace_sep), NULL);
2276 if (err)
2277 break;
2278 if (conv(&neg, &lval, i, 1, data)) {
2279 err = -EINVAL;
2280 break;
2281 }
2282 } else {
2283 if (conv(&neg, &lval, i, 0, data)) {
2284 err = -EINVAL;
2285 break;
2286 }
2287 if (!first)
2288 err = proc_put_char(&buffer, &left, '\t');
2289 if (err)
2290 break;
2291 err = proc_put_long(&buffer, &left, lval, neg);
2292 if (err)
2293 break;
2294 }
2295 }
2296
2297 if (!write && !first && left && !err)
2298 err = proc_put_char(&buffer, &left, '\n');
2299 if (write && !err && left)
2300 left -= proc_skip_spaces(&p);
2301 if (write) {
2302 kfree(kbuf);
2303 if (first)
2304 return err ? : -EINVAL;
2305 }
2306 *lenp -= left;
2307 out:
2308 *ppos += *lenp;
2309 return err;
2310 }
2311
2312 static int do_proc_dointvec(struct ctl_table *table, int write,
2313 void __user *buffer, size_t *lenp, loff_t *ppos,
2314 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2315 int write, void *data),
2316 void *data)
2317 {
2318 return __do_proc_dointvec(table->data, table, write,
2319 buffer, lenp, ppos, conv, data);
2320 }
2321
2322 static int do_proc_douintvec_w(unsigned int *tbl_data,
2323 struct ctl_table *table,
2324 void __user *buffer,
2325 size_t *lenp, loff_t *ppos,
2326 int (*conv)(unsigned long *lvalp,
2327 unsigned int *valp,
2328 int write, void *data),
2329 void *data)
2330 {
2331 unsigned long lval;
2332 int err = 0;
2333 size_t left;
2334 bool neg;
2335 char *kbuf = NULL, *p;
2336
2337 left = *lenp;
2338
2339 if (proc_first_pos_non_zero_ignore(ppos, table))
2340 goto bail_early;
2341
2342 if (left > PAGE_SIZE - 1)
2343 left = PAGE_SIZE - 1;
2344
2345 p = kbuf = memdup_user_nul(buffer, left);
2346 if (IS_ERR(kbuf))
2347 return -EINVAL;
2348
2349 left -= proc_skip_spaces(&p);
2350 if (!left) {
2351 err = -EINVAL;
2352 goto out_free;
2353 }
2354
2355 err = proc_get_long(&p, &left, &lval, &neg,
2356 proc_wspace_sep,
2357 sizeof(proc_wspace_sep), NULL);
2358 if (err || neg) {
2359 err = -EINVAL;
2360 goto out_free;
2361 }
2362
2363 if (conv(&lval, tbl_data, 1, data)) {
2364 err = -EINVAL;
2365 goto out_free;
2366 }
2367
2368 if (!err && left)
2369 left -= proc_skip_spaces(&p);
2370
2371 out_free:
2372 kfree(kbuf);
2373 if (err)
2374 return -EINVAL;
2375
2376 return 0;
2377
2378 /* This is in keeping with old __do_proc_dointvec() */
2379 bail_early:
2380 *ppos += *lenp;
2381 return err;
2382 }
2383
2384 static int do_proc_douintvec_r(unsigned int *tbl_data, void __user *buffer,
2385 size_t *lenp, loff_t *ppos,
2386 int (*conv)(unsigned long *lvalp,
2387 unsigned int *valp,
2388 int write, void *data),
2389 void *data)
2390 {
2391 unsigned long lval;
2392 int err = 0;
2393 size_t left;
2394
2395 left = *lenp;
2396
2397 if (conv(&lval, tbl_data, 0, data)) {
2398 err = -EINVAL;
2399 goto out;
2400 }
2401
2402 err = proc_put_long(&buffer, &left, lval, false);
2403 if (err || !left)
2404 goto out;
2405
2406 err = proc_put_char(&buffer, &left, '\n');
2407
2408 out:
2409 *lenp -= left;
2410 *ppos += *lenp;
2411
2412 return err;
2413 }
2414
2415 static int __do_proc_douintvec(void *tbl_data, struct ctl_table *table,
2416 int write, void __user *buffer,
2417 size_t *lenp, loff_t *ppos,
2418 int (*conv)(unsigned long *lvalp,
2419 unsigned int *valp,
2420 int write, void *data),
2421 void *data)
2422 {
2423 unsigned int *i, vleft;
2424
2425 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
2426 *lenp = 0;
2427 return 0;
2428 }
2429
2430 i = (unsigned int *) tbl_data;
2431 vleft = table->maxlen / sizeof(*i);
2432
2433 /*
2434 * Arrays are not supported, keep this simple. *Do not* add
2435 * support for them.
2436 */
2437 if (vleft != 1) {
2438 *lenp = 0;
2439 return -EINVAL;
2440 }
2441
2442 if (!conv)
2443 conv = do_proc_douintvec_conv;
2444
2445 if (write)
2446 return do_proc_douintvec_w(i, table, buffer, lenp, ppos,
2447 conv, data);
2448 return do_proc_douintvec_r(i, buffer, lenp, ppos, conv, data);
2449 }
2450
2451 static int do_proc_douintvec(struct ctl_table *table, int write,
2452 void __user *buffer, size_t *lenp, loff_t *ppos,
2453 int (*conv)(unsigned long *lvalp,
2454 unsigned int *valp,
2455 int write, void *data),
2456 void *data)
2457 {
2458 return __do_proc_douintvec(table->data, table, write,
2459 buffer, lenp, ppos, conv, data);
2460 }
2461
2462 /**
2463 * proc_dointvec - read a vector of integers
2464 * @table: the sysctl table
2465 * @write: %TRUE if this is a write to the sysctl file
2466 * @buffer: the user buffer
2467 * @lenp: the size of the user buffer
2468 * @ppos: file position
2469 *
2470 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2471 * values from/to the user buffer, treated as an ASCII string.
2472 *
2473 * Returns 0 on success.
2474 */
2475 int proc_dointvec(struct ctl_table *table, int write,
2476 void __user *buffer, size_t *lenp, loff_t *ppos)
2477 {
2478 return do_proc_dointvec(table, write, buffer, lenp, ppos, NULL, NULL);
2479 }
2480
2481 /**
2482 * proc_douintvec - read a vector of unsigned integers
2483 * @table: the sysctl table
2484 * @write: %TRUE if this is a write to the sysctl file
2485 * @buffer: the user buffer
2486 * @lenp: the size of the user buffer
2487 * @ppos: file position
2488 *
2489 * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
2490 * values from/to the user buffer, treated as an ASCII string.
2491 *
2492 * Returns 0 on success.
2493 */
2494 int proc_douintvec(struct ctl_table *table, int write,
2495 void __user *buffer, size_t *lenp, loff_t *ppos)
2496 {
2497 return do_proc_douintvec(table, write, buffer, lenp, ppos,
2498 do_proc_douintvec_conv, NULL);
2499 }
2500
2501 /*
2502 * Taint values can only be increased
2503 * This means we can safely use a temporary.
2504 */
2505 static int proc_taint(struct ctl_table *table, int write,
2506 void __user *buffer, size_t *lenp, loff_t *ppos)
2507 {
2508 struct ctl_table t;
2509 unsigned long tmptaint = get_taint();
2510 int err;
2511
2512 if (write && !capable(CAP_SYS_ADMIN))
2513 return -EPERM;
2514
2515 t = *table;
2516 t.data = &tmptaint;
2517 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
2518 if (err < 0)
2519 return err;
2520
2521 if (write) {
2522 /*
2523 * Poor man's atomic or. Not worth adding a primitive
2524 * to everyone's atomic.h for this
2525 */
2526 int i;
2527 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2528 if ((tmptaint >> i) & 1)
2529 add_taint(i, LOCKDEP_STILL_OK);
2530 }
2531 }
2532
2533 return err;
2534 }
2535
2536 #ifdef CONFIG_PRINTK
2537 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
2538 void __user *buffer, size_t *lenp, loff_t *ppos)
2539 {
2540 if (write && !capable(CAP_SYS_ADMIN))
2541 return -EPERM;
2542
2543 return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2544 }
2545 #endif
2546
2547 /**
2548 * struct do_proc_dointvec_minmax_conv_param - proc_dointvec_minmax() range checking structure
2549 * @min: pointer to minimum allowable value
2550 * @max: pointer to maximum allowable value
2551 *
2552 * The do_proc_dointvec_minmax_conv_param structure provides the
2553 * minimum and maximum values for doing range checking for those sysctl
2554 * parameters that use the proc_dointvec_minmax() handler.
2555 */
2556 struct do_proc_dointvec_minmax_conv_param {
2557 int *min;
2558 int *max;
2559 };
2560
2561 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
2562 int *valp,
2563 int write, void *data)
2564 {
2565 struct do_proc_dointvec_minmax_conv_param *param = data;
2566 if (write) {
2567 int val = *negp ? -*lvalp : *lvalp;
2568 if ((param->min && *param->min > val) ||
2569 (param->max && *param->max < val))
2570 return -EINVAL;
2571 *valp = val;
2572 } else {
2573 int val = *valp;
2574 if (val < 0) {
2575 *negp = true;
2576 *lvalp = -(unsigned long)val;
2577 } else {
2578 *negp = false;
2579 *lvalp = (unsigned long)val;
2580 }
2581 }
2582 return 0;
2583 }
2584
2585 /**
2586 * proc_dointvec_minmax - read a vector of integers with min/max values
2587 * @table: the sysctl table
2588 * @write: %TRUE if this is a write to the sysctl file
2589 * @buffer: the user buffer
2590 * @lenp: the size of the user buffer
2591 * @ppos: file position
2592 *
2593 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2594 * values from/to the user buffer, treated as an ASCII string.
2595 *
2596 * This routine will ensure the values are within the range specified by
2597 * table->extra1 (min) and table->extra2 (max).
2598 *
2599 * Returns 0 on success or -EINVAL on write when the range check fails.
2600 */
2601 int proc_dointvec_minmax(struct ctl_table *table, int write,
2602 void __user *buffer, size_t *lenp, loff_t *ppos)
2603 {
2604 struct do_proc_dointvec_minmax_conv_param param = {
2605 .min = (int *) table->extra1,
2606 .max = (int *) table->extra2,
2607 };
2608 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2609 do_proc_dointvec_minmax_conv, &param);
2610 }
2611
2612 /**
2613 * struct do_proc_douintvec_minmax_conv_param - proc_douintvec_minmax() range checking structure
2614 * @min: pointer to minimum allowable value
2615 * @max: pointer to maximum allowable value
2616 *
2617 * The do_proc_douintvec_minmax_conv_param structure provides the
2618 * minimum and maximum values for doing range checking for those sysctl
2619 * parameters that use the proc_douintvec_minmax() handler.
2620 */
2621 struct do_proc_douintvec_minmax_conv_param {
2622 unsigned int *min;
2623 unsigned int *max;
2624 };
2625
2626 static int do_proc_douintvec_minmax_conv(unsigned long *lvalp,
2627 unsigned int *valp,
2628 int write, void *data)
2629 {
2630 struct do_proc_douintvec_minmax_conv_param *param = data;
2631
2632 if (write) {
2633 unsigned int val = *lvalp;
2634
2635 if (*lvalp > UINT_MAX)
2636 return -EINVAL;
2637
2638 if ((param->min && *param->min > val) ||
2639 (param->max && *param->max < val))
2640 return -ERANGE;
2641
2642 *valp = val;
2643 } else {
2644 unsigned int val = *valp;
2645 *lvalp = (unsigned long) val;
2646 }
2647
2648 return 0;
2649 }
2650
2651 /**
2652 * proc_douintvec_minmax - read a vector of unsigned ints with min/max values
2653 * @table: the sysctl table
2654 * @write: %TRUE if this is a write to the sysctl file
2655 * @buffer: the user buffer
2656 * @lenp: the size of the user buffer
2657 * @ppos: file position
2658 *
2659 * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
2660 * values from/to the user buffer, treated as an ASCII string. Negative
2661 * strings are not allowed.
2662 *
2663 * This routine will ensure the values are within the range specified by
2664 * table->extra1 (min) and table->extra2 (max). There is a final sanity
2665 * check for UINT_MAX to avoid having to support wrap around uses from
2666 * userspace.
2667 *
2668 * Returns 0 on success or -ERANGE on write when the range check fails.
2669 */
2670 int proc_douintvec_minmax(struct ctl_table *table, int write,
2671 void __user *buffer, size_t *lenp, loff_t *ppos)
2672 {
2673 struct do_proc_douintvec_minmax_conv_param param = {
2674 .min = (unsigned int *) table->extra1,
2675 .max = (unsigned int *) table->extra2,
2676 };
2677 return do_proc_douintvec(table, write, buffer, lenp, ppos,
2678 do_proc_douintvec_minmax_conv, &param);
2679 }
2680
2681 static int do_proc_dopipe_max_size_conv(unsigned long *lvalp,
2682 unsigned int *valp,
2683 int write, void *data)
2684 {
2685 if (write) {
2686 unsigned int val;
2687
2688 val = round_pipe_size(*lvalp);
2689 if (val == 0)
2690 return -EINVAL;
2691
2692 *valp = val;
2693 } else {
2694 unsigned int val = *valp;
2695 *lvalp = (unsigned long) val;
2696 }
2697
2698 return 0;
2699 }
2700
2701 static int proc_dopipe_max_size(struct ctl_table *table, int write,
2702 void __user *buffer, size_t *lenp, loff_t *ppos)
2703 {
2704 return do_proc_douintvec(table, write, buffer, lenp, ppos,
2705 do_proc_dopipe_max_size_conv, NULL);
2706 }
2707
2708 static void validate_coredump_safety(void)
2709 {
2710 #ifdef CONFIG_COREDUMP
2711 if (suid_dumpable == SUID_DUMP_ROOT &&
2712 core_pattern[0] != '/' && core_pattern[0] != '|') {
2713 printk(KERN_WARNING
2714 "Unsafe core_pattern used with fs.suid_dumpable=2.\n"
2715 "Pipe handler or fully qualified core dump path required.\n"
2716 "Set kernel.core_pattern before fs.suid_dumpable.\n"
2717 );
2718 }
2719 #endif
2720 }
2721
2722 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
2723 void __user *buffer, size_t *lenp, loff_t *ppos)
2724 {
2725 int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2726 if (!error)
2727 validate_coredump_safety();
2728 return error;
2729 }
2730
2731 #ifdef CONFIG_COREDUMP
2732 static int proc_dostring_coredump(struct ctl_table *table, int write,
2733 void __user *buffer, size_t *lenp, loff_t *ppos)
2734 {
2735 int error = proc_dostring(table, write, buffer, lenp, ppos);
2736 if (!error)
2737 validate_coredump_safety();
2738 return error;
2739 }
2740 #endif
2741
2742 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2743 void __user *buffer,
2744 size_t *lenp, loff_t *ppos,
2745 unsigned long convmul,
2746 unsigned long convdiv)
2747 {
2748 unsigned long *i, *min, *max;
2749 int vleft, first = 1, err = 0;
2750 size_t left;
2751 char *kbuf = NULL, *p;
2752
2753 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
2754 *lenp = 0;
2755 return 0;
2756 }
2757
2758 i = (unsigned long *) data;
2759 min = (unsigned long *) table->extra1;
2760 max = (unsigned long *) table->extra2;
2761 vleft = table->maxlen / sizeof(unsigned long);
2762 left = *lenp;
2763
2764 if (write) {
2765 if (proc_first_pos_non_zero_ignore(ppos, table))
2766 goto out;
2767
2768 if (left > PAGE_SIZE - 1)
2769 left = PAGE_SIZE - 1;
2770 p = kbuf = memdup_user_nul(buffer, left);
2771 if (IS_ERR(kbuf))
2772 return PTR_ERR(kbuf);
2773 }
2774
2775 for (; left && vleft--; i++, first = 0) {
2776 unsigned long val;
2777
2778 if (write) {
2779 bool neg;
2780
2781 left -= proc_skip_spaces(&p);
2782
2783 err = proc_get_long(&p, &left, &val, &neg,
2784 proc_wspace_sep,
2785 sizeof(proc_wspace_sep), NULL);
2786 if (err)
2787 break;
2788 if (neg)
2789 continue;
2790 val = convmul * val / convdiv;
2791 if ((min && val < *min) || (max && val > *max))
2792 continue;
2793 *i = val;
2794 } else {
2795 val = convdiv * (*i) / convmul;
2796 if (!first) {
2797 err = proc_put_char(&buffer, &left, '\t');
2798 if (err)
2799 break;
2800 }
2801 err = proc_put_long(&buffer, &left, val, false);
2802 if (err)
2803 break;
2804 }
2805 }
2806
2807 if (!write && !first && left && !err)
2808 err = proc_put_char(&buffer, &left, '\n');
2809 if (write && !err)
2810 left -= proc_skip_spaces(&p);
2811 if (write) {
2812 kfree(kbuf);
2813 if (first)
2814 return err ? : -EINVAL;
2815 }
2816 *lenp -= left;
2817 out:
2818 *ppos += *lenp;
2819 return err;
2820 }
2821
2822 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2823 void __user *buffer,
2824 size_t *lenp, loff_t *ppos,
2825 unsigned long convmul,
2826 unsigned long convdiv)
2827 {
2828 return __do_proc_doulongvec_minmax(table->data, table, write,
2829 buffer, lenp, ppos, convmul, convdiv);
2830 }
2831
2832 /**
2833 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2834 * @table: the sysctl table
2835 * @write: %TRUE if this is a write to the sysctl file
2836 * @buffer: the user buffer
2837 * @lenp: the size of the user buffer
2838 * @ppos: file position
2839 *
2840 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2841 * values from/to the user buffer, treated as an ASCII string.
2842 *
2843 * This routine will ensure the values are within the range specified by
2844 * table->extra1 (min) and table->extra2 (max).
2845 *
2846 * Returns 0 on success.
2847 */
2848 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2849 void __user *buffer, size_t *lenp, loff_t *ppos)
2850 {
2851 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
2852 }
2853
2854 /**
2855 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2856 * @table: the sysctl table
2857 * @write: %TRUE if this is a write to the sysctl file
2858 * @buffer: the user buffer
2859 * @lenp: the size of the user buffer
2860 * @ppos: file position
2861 *
2862 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2863 * values from/to the user buffer, treated as an ASCII string. The values
2864 * are treated as milliseconds, and converted to jiffies when they are stored.
2865 *
2866 * This routine will ensure the values are within the range specified by
2867 * table->extra1 (min) and table->extra2 (max).
2868 *
2869 * Returns 0 on success.
2870 */
2871 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2872 void __user *buffer,
2873 size_t *lenp, loff_t *ppos)
2874 {
2875 return do_proc_doulongvec_minmax(table, write, buffer,
2876 lenp, ppos, HZ, 1000l);
2877 }
2878
2879
2880 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
2881 int *valp,
2882 int write, void *data)
2883 {
2884 if (write) {
2885 if (*lvalp > INT_MAX / HZ)
2886 return 1;
2887 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2888 } else {
2889 int val = *valp;
2890 unsigned long lval;
2891 if (val < 0) {
2892 *negp = true;
2893 lval = -(unsigned long)val;
2894 } else {
2895 *negp = false;
2896 lval = (unsigned long)val;
2897 }
2898 *lvalp = lval / HZ;
2899 }
2900 return 0;
2901 }
2902
2903 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
2904 int *valp,
2905 int write, void *data)
2906 {
2907 if (write) {
2908 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2909 return 1;
2910 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2911 } else {
2912 int val = *valp;
2913 unsigned long lval;
2914 if (val < 0) {
2915 *negp = true;
2916 lval = -(unsigned long)val;
2917 } else {
2918 *negp = false;
2919 lval = (unsigned long)val;
2920 }
2921 *lvalp = jiffies_to_clock_t(lval);
2922 }
2923 return 0;
2924 }
2925
2926 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
2927 int *valp,
2928 int write, void *data)
2929 {
2930 if (write) {
2931 unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2932
2933 if (jif > INT_MAX)
2934 return 1;
2935 *valp = (int)jif;
2936 } else {
2937 int val = *valp;
2938 unsigned long lval;
2939 if (val < 0) {
2940 *negp = true;
2941 lval = -(unsigned long)val;
2942 } else {
2943 *negp = false;
2944 lval = (unsigned long)val;
2945 }
2946 *lvalp = jiffies_to_msecs(lval);
2947 }
2948 return 0;
2949 }
2950
2951 /**
2952 * proc_dointvec_jiffies - read a vector of integers as seconds
2953 * @table: the sysctl table
2954 * @write: %TRUE if this is a write to the sysctl file
2955 * @buffer: the user buffer
2956 * @lenp: the size of the user buffer
2957 * @ppos: file position
2958 *
2959 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2960 * values from/to the user buffer, treated as an ASCII string.
2961 * The values read are assumed to be in seconds, and are converted into
2962 * jiffies.
2963 *
2964 * Returns 0 on success.
2965 */
2966 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2967 void __user *buffer, size_t *lenp, loff_t *ppos)
2968 {
2969 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2970 do_proc_dointvec_jiffies_conv,NULL);
2971 }
2972
2973 /**
2974 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2975 * @table: the sysctl table
2976 * @write: %TRUE if this is a write to the sysctl file
2977 * @buffer: the user buffer
2978 * @lenp: the size of the user buffer
2979 * @ppos: pointer to the file position
2980 *
2981 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2982 * values from/to the user buffer, treated as an ASCII string.
2983 * The values read are assumed to be in 1/USER_HZ seconds, and
2984 * are converted into jiffies.
2985 *
2986 * Returns 0 on success.
2987 */
2988 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2989 void __user *buffer, size_t *lenp, loff_t *ppos)
2990 {
2991 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2992 do_proc_dointvec_userhz_jiffies_conv,NULL);
2993 }
2994
2995 /**
2996 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2997 * @table: the sysctl table
2998 * @write: %TRUE if this is a write to the sysctl file
2999 * @buffer: the user buffer
3000 * @lenp: the size of the user buffer
3001 * @ppos: file position
3002 * @ppos: the current position in the file
3003 *
3004 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
3005 * values from/to the user buffer, treated as an ASCII string.
3006 * The values read are assumed to be in 1/1000 seconds, and
3007 * are converted into jiffies.
3008 *
3009 * Returns 0 on success.
3010 */
3011 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
3012 void __user *buffer, size_t *lenp, loff_t *ppos)
3013 {
3014 return do_proc_dointvec(table, write, buffer, lenp, ppos,
3015 do_proc_dointvec_ms_jiffies_conv, NULL);
3016 }
3017
3018 static int proc_do_cad_pid(struct ctl_table *table, int write,
3019 void __user *buffer, size_t *lenp, loff_t *ppos)
3020 {
3021 struct pid *new_pid;
3022 pid_t tmp;
3023 int r;
3024
3025 tmp = pid_vnr(cad_pid);
3026
3027 r = __do_proc_dointvec(&tmp, table, write, buffer,
3028 lenp, ppos, NULL, NULL);
3029 if (r || !write)
3030 return r;
3031
3032 new_pid = find_get_pid(tmp);
3033 if (!new_pid)
3034 return -ESRCH;
3035
3036 put_pid(xchg(&cad_pid, new_pid));
3037 return 0;
3038 }
3039
3040 /**
3041 * proc_do_large_bitmap - read/write from/to a large bitmap
3042 * @table: the sysctl table
3043 * @write: %TRUE if this is a write to the sysctl file
3044 * @buffer: the user buffer
3045 * @lenp: the size of the user buffer
3046 * @ppos: file position
3047 *
3048 * The bitmap is stored at table->data and the bitmap length (in bits)
3049 * in table->maxlen.
3050 *
3051 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
3052 * large bitmaps may be represented in a compact manner. Writing into
3053 * the file will clear the bitmap then update it with the given input.
3054 *
3055 * Returns 0 on success.
3056 */
3057 int proc_do_large_bitmap(struct ctl_table *table, int write,
3058 void __user *buffer, size_t *lenp, loff_t *ppos)
3059 {
3060 int err = 0;
3061 bool first = 1;
3062 size_t left = *lenp;
3063 unsigned long bitmap_len = table->maxlen;
3064 unsigned long *bitmap = *(unsigned long **) table->data;
3065 unsigned long *tmp_bitmap = NULL;
3066 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
3067
3068 if (!bitmap || !bitmap_len || !left || (*ppos && !write)) {
3069 *lenp = 0;
3070 return 0;
3071 }
3072
3073 if (write) {
3074 char *kbuf, *p;
3075
3076 if (left > PAGE_SIZE - 1)
3077 left = PAGE_SIZE - 1;
3078
3079 p = kbuf = memdup_user_nul(buffer, left);
3080 if (IS_ERR(kbuf))
3081 return PTR_ERR(kbuf);
3082
3083 tmp_bitmap = kcalloc(BITS_TO_LONGS(bitmap_len),
3084 sizeof(unsigned long),
3085 GFP_KERNEL);
3086 if (!tmp_bitmap) {
3087 kfree(kbuf);
3088 return -ENOMEM;
3089 }
3090 proc_skip_char(&p, &left, '\n');
3091 while (!err && left) {
3092 unsigned long val_a, val_b;
3093 bool neg;
3094
3095 err = proc_get_long(&p, &left, &val_a, &neg, tr_a,
3096 sizeof(tr_a), &c);
3097 if (err)
3098 break;
3099 if (val_a >= bitmap_len || neg) {
3100 err = -EINVAL;
3101 break;
3102 }
3103
3104 val_b = val_a;
3105 if (left) {
3106 p++;
3107 left--;
3108 }
3109
3110 if (c == '-') {
3111 err = proc_get_long(&p, &left, &val_b,
3112 &neg, tr_b, sizeof(tr_b),
3113 &c);
3114 if (err)
3115 break;
3116 if (val_b >= bitmap_len || neg ||
3117 val_a > val_b) {
3118 err = -EINVAL;
3119 break;
3120 }
3121 if (left) {
3122 p++;
3123 left--;
3124 }
3125 }
3126
3127 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
3128 first = 0;
3129 proc_skip_char(&p, &left, '\n');
3130 }
3131 kfree(kbuf);
3132 } else {
3133 unsigned long bit_a, bit_b = 0;
3134
3135 while (left) {
3136 bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
3137 if (bit_a >= bitmap_len)
3138 break;
3139 bit_b = find_next_zero_bit(bitmap, bitmap_len,
3140 bit_a + 1) - 1;
3141
3142 if (!first) {
3143 err = proc_put_char(&buffer, &left, ',');
3144 if (err)
3145 break;
3146 }
3147 err = proc_put_long(&buffer, &left, bit_a, false);
3148 if (err)
3149 break;
3150 if (bit_a != bit_b) {
3151 err = proc_put_char(&buffer, &left, '-');
3152 if (err)
3153 break;
3154 err = proc_put_long(&buffer, &left, bit_b, false);
3155 if (err)
3156 break;
3157 }
3158
3159 first = 0; bit_b++;
3160 }
3161 if (!err)
3162 err = proc_put_char(&buffer, &left, '\n');
3163 }
3164
3165 if (!err) {
3166 if (write) {
3167 if (*ppos)
3168 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
3169 else
3170 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
3171 }
3172 *lenp -= left;
3173 *ppos += *lenp;
3174 }
3175
3176 kfree(tmp_bitmap);
3177 return err;
3178 }
3179
3180 #else /* CONFIG_PROC_SYSCTL */
3181
3182 int proc_dostring(struct ctl_table *table, int write,
3183 void __user *buffer, size_t *lenp, loff_t *ppos)
3184 {
3185 return -ENOSYS;
3186 }
3187
3188 int proc_dointvec(struct ctl_table *table, int write,
3189 void __user *buffer, size_t *lenp, loff_t *ppos)
3190 {
3191 return -ENOSYS;
3192 }
3193
3194 int proc_douintvec(struct ctl_table *table, int write,
3195 void __user *buffer, size_t *lenp, loff_t *ppos)
3196 {
3197 return -ENOSYS;
3198 }
3199
3200 int proc_dointvec_minmax(struct ctl_table *table, int write,
3201 void __user *buffer, size_t *lenp, loff_t *ppos)
3202 {
3203 return -ENOSYS;
3204 }
3205
3206 int proc_douintvec_minmax(struct ctl_table *table, int write,
3207 void __user *buffer, size_t *lenp, loff_t *ppos)
3208 {
3209 return -ENOSYS;
3210 }
3211
3212 int proc_dointvec_jiffies(struct ctl_table *table, int write,
3213 void __user *buffer, size_t *lenp, loff_t *ppos)
3214 {
3215 return -ENOSYS;
3216 }
3217
3218 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
3219 void __user *buffer, size_t *lenp, loff_t *ppos)
3220 {
3221 return -ENOSYS;
3222 }
3223
3224 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
3225 void __user *buffer, size_t *lenp, loff_t *ppos)
3226 {
3227 return -ENOSYS;
3228 }
3229
3230 int proc_doulongvec_minmax(struct ctl_table *table, int write,
3231 void __user *buffer, size_t *lenp, loff_t *ppos)
3232 {
3233 return -ENOSYS;
3234 }
3235
3236 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
3237 void __user *buffer,
3238 size_t *lenp, loff_t *ppos)
3239 {
3240 return -ENOSYS;
3241 }
3242
3243
3244 #endif /* CONFIG_PROC_SYSCTL */
3245
3246 /*
3247 * No sense putting this after each symbol definition, twice,
3248 * exception granted :-)
3249 */
3250 EXPORT_SYMBOL(proc_dointvec);
3251 EXPORT_SYMBOL(proc_douintvec);
3252 EXPORT_SYMBOL(proc_dointvec_jiffies);
3253 EXPORT_SYMBOL(proc_dointvec_minmax);
3254 EXPORT_SYMBOL_GPL(proc_douintvec_minmax);
3255 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
3256 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
3257 EXPORT_SYMBOL(proc_dostring);
3258 EXPORT_SYMBOL(proc_doulongvec_minmax);
3259 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
Linux with added FPC-III support