1 // SPDX-License-Identifier: GPL-2.0-only
3 * sysctl.c: General linux system control interface
5 * Begun 24 March 1995, Stephen Tweedie
6 * Added /proc support, Dec 1995
7 * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas.
8 * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver.
9 * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver.
10 * Dynamic registration fixes, Stephen Tweedie.
11 * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn.
12 * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris
14 * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer.
15 * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer.
16 * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill
18 * The list_for_each() macro wasn't appropriate for the sysctl loop.
19 * Removed it and replaced it with older style, 03/23/00, Bill Wendling
22 #include <linux/module.h>
23 #include <linux/aio.h>
25 #include <linux/swap.h>
26 #include <linux/slab.h>
27 #include <linux/sysctl.h>
28 #include <linux/bitmap.h>
29 #include <linux/signal.h>
30 #include <linux/printk.h>
31 #include <linux/proc_fs.h>
32 #include <linux/security.h>
33 #include <linux/ctype.h>
34 #include <linux/kmemleak.h>
36 #include <linux/init.h>
37 #include <linux/kernel.h>
38 #include <linux/kobject.h>
39 #include <linux/net.h>
40 #include <linux/sysrq.h>
41 #include <linux/highuid.h>
42 #include <linux/writeback.h>
43 #include <linux/ratelimit.h>
44 #include <linux/compaction.h>
45 #include <linux/hugetlb.h>
46 #include <linux/initrd.h>
47 #include <linux/key.h>
48 #include <linux/times.h>
49 #include <linux/limits.h>
50 #include <linux/dcache.h>
51 #include <linux/dnotify.h>
52 #include <linux/syscalls.h>
53 #include <linux/vmstat.h>
54 #include <linux/nfs_fs.h>
55 #include <linux/acpi.h>
56 #include <linux/reboot.h>
57 #include <linux/ftrace.h>
58 #include <linux/perf_event.h>
59 #include <linux/kprobes.h>
60 #include <linux/pipe_fs_i.h>
61 #include <linux/oom.h>
62 #include <linux/kmod.h>
63 #include <linux/capability.h>
64 #include <linux/binfmts.h>
65 #include <linux/sched/sysctl.h>
66 #include <linux/sched/coredump.h>
67 #include <linux/kexec.h>
68 #include <linux/bpf.h>
69 #include <linux/mount.h>
70 #include <linux/userfaultfd_k.h>
71 #include <linux/coredump.h>
72 #include <linux/latencytop.h>
73 #include <linux/pid.h>
75 #include "../lib/kstrtox.h"
77 #include <linux/uaccess.h>
78 #include <asm/processor.h>
82 #include <asm/stacktrace.h>
86 #include <asm/setup.h>
88 #ifdef CONFIG_BSD_PROCESS_ACCT
89 #include <linux/acct.h>
91 #ifdef CONFIG_RT_MUTEXES
92 #include <linux/rtmutex.h>
94 #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
95 #include <linux/lockdep.h>
97 #ifdef CONFIG_CHR_DEV_SG
100 #ifdef CONFIG_STACKLEAK_RUNTIME_DISABLE
101 #include <linux/stackleak.h>
103 #ifdef CONFIG_LOCKUP_DETECTOR
104 #include <linux/nmi.h>
107 #if defined(CONFIG_SYSCTL)
109 /* Constants used for minimum and maximum */
110 #ifdef CONFIG_LOCKUP_DETECTOR
111 static int sixty
= 60;
114 static int __maybe_unused neg_one
= -1;
115 static int __maybe_unused two
= 2;
116 static int __maybe_unused four
= 4;
117 static unsigned long zero_ul
;
118 static unsigned long one_ul
= 1;
119 static unsigned long long_max
= LONG_MAX
;
120 static int one_hundred
= 100;
121 static int two_hundred
= 200;
122 static int one_thousand
= 1000;
124 static int ten_thousand
= 10000;
126 #ifdef CONFIG_PERF_EVENTS
127 static int six_hundred_forty_kb
= 640 * 1024;
130 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
131 static unsigned long dirty_bytes_min
= 2 * PAGE_SIZE
;
133 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
134 static int maxolduid
= 65535;
135 static int minolduid
;
137 static int ngroups_max
= NGROUPS_MAX
;
138 static const int cap_last_cap
= CAP_LAST_CAP
;
141 * This is needed for proc_doulongvec_minmax of sysctl_hung_task_timeout_secs
142 * and hung_task_check_interval_secs
144 #ifdef CONFIG_DETECT_HUNG_TASK
145 static unsigned long hung_task_timeout_max
= (LONG_MAX
/HZ
);
148 #ifdef CONFIG_INOTIFY_USER
149 #include <linux/inotify.h>
151 #ifdef CONFIG_FANOTIFY
152 #include <linux/fanotify.h>
155 #ifdef CONFIG_PROC_SYSCTL
158 * enum sysctl_writes_mode - supported sysctl write modes
160 * @SYSCTL_WRITES_LEGACY: each write syscall must fully contain the sysctl value
161 * to be written, and multiple writes on the same sysctl file descriptor
162 * will rewrite the sysctl value, regardless of file position. No warning
163 * is issued when the initial position is not 0.
164 * @SYSCTL_WRITES_WARN: same as above but warn when the initial file position is
166 * @SYSCTL_WRITES_STRICT: writes to numeric sysctl entries must always be at
167 * file position 0 and the value must be fully contained in the buffer
168 * sent to the write syscall. If dealing with strings respect the file
169 * position, but restrict this to the max length of the buffer, anything
170 * passed the max length will be ignored. Multiple writes will append
173 * These write modes control how current file position affects the behavior of
174 * updating sysctl values through the proc interface on each write.
176 enum sysctl_writes_mode
{
177 SYSCTL_WRITES_LEGACY
= -1,
178 SYSCTL_WRITES_WARN
= 0,
179 SYSCTL_WRITES_STRICT
= 1,
182 static enum sysctl_writes_mode sysctl_writes_strict
= SYSCTL_WRITES_STRICT
;
183 #endif /* CONFIG_PROC_SYSCTL */
185 #if defined(HAVE_ARCH_PICK_MMAP_LAYOUT) || \
186 defined(CONFIG_ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT)
187 int sysctl_legacy_va_layout
;
190 #ifdef CONFIG_COMPACTION
191 static int min_extfrag_threshold
;
192 static int max_extfrag_threshold
= 1000;
195 #endif /* CONFIG_SYSCTL */
197 #if defined(CONFIG_BPF_SYSCALL) && defined(CONFIG_SYSCTL)
198 static int bpf_stats_handler(struct ctl_table
*table
, int write
,
199 void *buffer
, size_t *lenp
, loff_t
*ppos
)
201 struct static_key
*key
= (struct static_key
*)table
->data
;
202 static int saved_val
;
204 struct ctl_table tmp
= {
206 .maxlen
= sizeof(val
),
208 .extra1
= SYSCTL_ZERO
,
209 .extra2
= SYSCTL_ONE
,
212 if (write
&& !capable(CAP_SYS_ADMIN
))
215 mutex_lock(&bpf_stats_enabled_mutex
);
217 ret
= proc_dointvec_minmax(&tmp
, write
, buffer
, lenp
, ppos
);
218 if (write
&& !ret
&& val
!= saved_val
) {
220 static_key_slow_inc(key
);
222 static_key_slow_dec(key
);
225 mutex_unlock(&bpf_stats_enabled_mutex
);
229 static int bpf_unpriv_handler(struct ctl_table
*table
, int write
,
230 void *buffer
, size_t *lenp
, loff_t
*ppos
)
232 int ret
, unpriv_enable
= *(int *)table
->data
;
233 bool locked_state
= unpriv_enable
== 1;
234 struct ctl_table tmp
= *table
;
236 if (write
&& !capable(CAP_SYS_ADMIN
))
239 tmp
.data
= &unpriv_enable
;
240 ret
= proc_dointvec_minmax(&tmp
, write
, buffer
, lenp
, ppos
);
242 if (locked_state
&& unpriv_enable
!= 1)
244 *(int *)table
->data
= unpriv_enable
;
248 #endif /* CONFIG_BPF_SYSCALL && CONFIG_SYSCTL */
254 #ifdef CONFIG_PROC_SYSCTL
256 static int _proc_do_string(char *data
, int maxlen
, int write
,
257 char *buffer
, size_t *lenp
, loff_t
*ppos
)
262 if (!data
|| !maxlen
|| !*lenp
) {
268 if (sysctl_writes_strict
== SYSCTL_WRITES_STRICT
) {
269 /* Only continue writes not past the end of buffer. */
271 if (len
> maxlen
- 1)
278 /* Start writing from beginning of buffer. */
284 while ((p
- buffer
) < *lenp
&& len
< maxlen
- 1) {
286 if (c
== 0 || c
== '\n')
307 memcpy(buffer
, data
, len
);
318 static void warn_sysctl_write(struct ctl_table
*table
)
320 pr_warn_once("%s wrote to %s when file position was not 0!\n"
321 "This will not be supported in the future. To silence this\n"
322 "warning, set kernel.sysctl_writes_strict = -1\n",
323 current
->comm
, table
->procname
);
327 * proc_first_pos_non_zero_ignore - check if first position is allowed
328 * @ppos: file position
329 * @table: the sysctl table
331 * Returns true if the first position is non-zero and the sysctl_writes_strict
332 * mode indicates this is not allowed for numeric input types. String proc
333 * handlers can ignore the return value.
335 static bool proc_first_pos_non_zero_ignore(loff_t
*ppos
,
336 struct ctl_table
*table
)
341 switch (sysctl_writes_strict
) {
342 case SYSCTL_WRITES_STRICT
:
344 case SYSCTL_WRITES_WARN
:
345 warn_sysctl_write(table
);
353 * proc_dostring - read a string sysctl
354 * @table: the sysctl table
355 * @write: %TRUE if this is a write to the sysctl file
356 * @buffer: the user buffer
357 * @lenp: the size of the user buffer
358 * @ppos: file position
360 * Reads/writes a string from/to the user buffer. If the kernel
361 * buffer provided is not large enough to hold the string, the
362 * string is truncated. The copied string is %NULL-terminated.
363 * If the string is being read by the user process, it is copied
364 * and a newline '\n' is added. It is truncated if the buffer is
367 * Returns 0 on success.
369 int proc_dostring(struct ctl_table
*table
, int write
,
370 void *buffer
, size_t *lenp
, loff_t
*ppos
)
373 proc_first_pos_non_zero_ignore(ppos
, table
);
375 return _proc_do_string(table
->data
, table
->maxlen
, write
, buffer
, lenp
,
379 static size_t proc_skip_spaces(char **buf
)
382 char *tmp
= skip_spaces(*buf
);
388 static void proc_skip_char(char **buf
, size_t *size
, const char v
)
399 * strtoul_lenient - parse an ASCII formatted integer from a buffer and only
402 * @cp: kernel buffer containing the string to parse
403 * @endp: pointer to store the trailing characters
404 * @base: the base to use
405 * @res: where the parsed integer will be stored
407 * In case of success 0 is returned and @res will contain the parsed integer,
408 * @endp will hold any trailing characters.
409 * This function will fail the parse on overflow. If there wasn't an overflow
410 * the function will defer the decision what characters count as invalid to the
413 static int strtoul_lenient(const char *cp
, char **endp
, unsigned int base
,
416 unsigned long long result
;
419 cp
= _parse_integer_fixup_radix(cp
, &base
);
420 rv
= _parse_integer(cp
, base
, &result
);
421 if ((rv
& KSTRTOX_OVERFLOW
) || (result
!= (unsigned long)result
))
429 *res
= (unsigned long)result
;
435 * proc_get_long - reads an ASCII formatted integer from a user buffer
437 * @buf: a kernel buffer
438 * @size: size of the kernel buffer
439 * @val: this is where the number will be stored
440 * @neg: set to %TRUE if number is negative
441 * @perm_tr: a vector which contains the allowed trailers
442 * @perm_tr_len: size of the perm_tr vector
443 * @tr: pointer to store the trailer character
445 * In case of success %0 is returned and @buf and @size are updated with
446 * the amount of bytes read. If @tr is non-NULL and a trailing
447 * character exists (size is non-zero after returning from this
448 * function), @tr is updated with the trailing character.
450 static int proc_get_long(char **buf
, size_t *size
,
451 unsigned long *val
, bool *neg
,
452 const char *perm_tr
, unsigned perm_tr_len
, char *tr
)
455 char *p
, tmp
[TMPBUFLEN
];
461 if (len
> TMPBUFLEN
- 1)
464 memcpy(tmp
, *buf
, len
);
468 if (*p
== '-' && *size
> 1) {
476 if (strtoul_lenient(p
, &p
, 0, val
))
481 /* We don't know if the next char is whitespace thus we may accept
482 * invalid integers (e.g. 1234...a) or two integers instead of one
483 * (e.g. 123...1). So lets not allow such large numbers. */
484 if (len
== TMPBUFLEN
- 1)
487 if (len
< *size
&& perm_tr_len
&& !memchr(perm_tr
, *p
, perm_tr_len
))
490 if (tr
&& (len
< *size
))
500 * proc_put_long - converts an integer to a decimal ASCII formatted string
502 * @buf: the user buffer
503 * @size: the size of the user buffer
504 * @val: the integer to be converted
505 * @neg: sign of the number, %TRUE for negative
507 * In case of success @buf and @size are updated with the amount of bytes
510 static void proc_put_long(void **buf
, size_t *size
, unsigned long val
, bool neg
)
513 char tmp
[TMPBUFLEN
], *p
= tmp
;
515 sprintf(p
, "%s%lu", neg
? "-" : "", val
);
519 memcpy(*buf
, tmp
, len
);
525 static void proc_put_char(void **buf
, size_t *size
, char c
)
528 char **buffer
= (char **)buf
;
537 static int do_proc_dointvec_conv(bool *negp
, unsigned long *lvalp
,
539 int write
, void *data
)
543 if (*lvalp
> (unsigned long) INT_MAX
+ 1)
547 if (*lvalp
> (unsigned long) INT_MAX
)
555 *lvalp
= -(unsigned long)val
;
558 *lvalp
= (unsigned long)val
;
564 static int do_proc_douintvec_conv(unsigned long *lvalp
,
566 int write
, void *data
)
569 if (*lvalp
> UINT_MAX
)
573 unsigned int val
= *valp
;
574 *lvalp
= (unsigned long)val
;
579 static const char proc_wspace_sep
[] = { ' ', '\t', '\n' };
581 static int __do_proc_dointvec(void *tbl_data
, struct ctl_table
*table
,
582 int write
, void *buffer
,
583 size_t *lenp
, loff_t
*ppos
,
584 int (*conv
)(bool *negp
, unsigned long *lvalp
, int *valp
,
585 int write
, void *data
),
588 int *i
, vleft
, first
= 1, err
= 0;
592 if (!tbl_data
|| !table
->maxlen
|| !*lenp
|| (*ppos
&& !write
)) {
597 i
= (int *) tbl_data
;
598 vleft
= table
->maxlen
/ sizeof(*i
);
602 conv
= do_proc_dointvec_conv
;
605 if (proc_first_pos_non_zero_ignore(ppos
, table
))
608 if (left
> PAGE_SIZE
- 1)
609 left
= PAGE_SIZE
- 1;
613 for (; left
&& vleft
--; i
++, first
=0) {
618 left
-= proc_skip_spaces(&p
);
622 err
= proc_get_long(&p
, &left
, &lval
, &neg
,
624 sizeof(proc_wspace_sep
), NULL
);
627 if (conv(&neg
, &lval
, i
, 1, data
)) {
632 if (conv(&neg
, &lval
, i
, 0, data
)) {
637 proc_put_char(&buffer
, &left
, '\t');
638 proc_put_long(&buffer
, &left
, lval
, neg
);
642 if (!write
&& !first
&& left
&& !err
)
643 proc_put_char(&buffer
, &left
, '\n');
644 if (write
&& !err
&& left
)
645 left
-= proc_skip_spaces(&p
);
647 return err
? : -EINVAL
;
654 static int do_proc_dointvec(struct ctl_table
*table
, int write
,
655 void *buffer
, size_t *lenp
, loff_t
*ppos
,
656 int (*conv
)(bool *negp
, unsigned long *lvalp
, int *valp
,
657 int write
, void *data
),
660 return __do_proc_dointvec(table
->data
, table
, write
,
661 buffer
, lenp
, ppos
, conv
, data
);
664 static int do_proc_douintvec_w(unsigned int *tbl_data
,
665 struct ctl_table
*table
,
667 size_t *lenp
, loff_t
*ppos
,
668 int (*conv
)(unsigned long *lvalp
,
670 int write
, void *data
),
681 if (proc_first_pos_non_zero_ignore(ppos
, table
))
684 if (left
> PAGE_SIZE
- 1)
685 left
= PAGE_SIZE
- 1;
687 left
-= proc_skip_spaces(&p
);
693 err
= proc_get_long(&p
, &left
, &lval
, &neg
,
695 sizeof(proc_wspace_sep
), NULL
);
701 if (conv(&lval
, tbl_data
, 1, data
)) {
707 left
-= proc_skip_spaces(&p
);
715 /* This is in keeping with old __do_proc_dointvec() */
721 static int do_proc_douintvec_r(unsigned int *tbl_data
, void *buffer
,
722 size_t *lenp
, loff_t
*ppos
,
723 int (*conv
)(unsigned long *lvalp
,
725 int write
, void *data
),
734 if (conv(&lval
, tbl_data
, 0, data
)) {
739 proc_put_long(&buffer
, &left
, lval
, false);
743 proc_put_char(&buffer
, &left
, '\n');
752 static int __do_proc_douintvec(void *tbl_data
, struct ctl_table
*table
,
753 int write
, void *buffer
,
754 size_t *lenp
, loff_t
*ppos
,
755 int (*conv
)(unsigned long *lvalp
,
757 int write
, void *data
),
760 unsigned int *i
, vleft
;
762 if (!tbl_data
|| !table
->maxlen
|| !*lenp
|| (*ppos
&& !write
)) {
767 i
= (unsigned int *) tbl_data
;
768 vleft
= table
->maxlen
/ sizeof(*i
);
771 * Arrays are not supported, keep this simple. *Do not* add
780 conv
= do_proc_douintvec_conv
;
783 return do_proc_douintvec_w(i
, table
, buffer
, lenp
, ppos
,
785 return do_proc_douintvec_r(i
, buffer
, lenp
, ppos
, conv
, data
);
788 static int do_proc_douintvec(struct ctl_table
*table
, int write
,
789 void *buffer
, size_t *lenp
, loff_t
*ppos
,
790 int (*conv
)(unsigned long *lvalp
,
792 int write
, void *data
),
795 return __do_proc_douintvec(table
->data
, table
, write
,
796 buffer
, lenp
, ppos
, conv
, data
);
800 * proc_dointvec - read a vector of integers
801 * @table: the sysctl table
802 * @write: %TRUE if this is a write to the sysctl file
803 * @buffer: the user buffer
804 * @lenp: the size of the user buffer
805 * @ppos: file position
807 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
808 * values from/to the user buffer, treated as an ASCII string.
810 * Returns 0 on success.
812 int proc_dointvec(struct ctl_table
*table
, int write
, void *buffer
,
813 size_t *lenp
, loff_t
*ppos
)
815 return do_proc_dointvec(table
, write
, buffer
, lenp
, ppos
, NULL
, NULL
);
818 #ifdef CONFIG_COMPACTION
819 static int proc_dointvec_minmax_warn_RT_change(struct ctl_table
*table
,
820 int write
, void *buffer
, size_t *lenp
, loff_t
*ppos
)
824 if (!IS_ENABLED(CONFIG_PREEMPT_RT
) || !write
)
825 return proc_dointvec_minmax(table
, write
, buffer
, lenp
, ppos
);
827 old
= *(int *)table
->data
;
828 ret
= proc_dointvec_minmax(table
, write
, buffer
, lenp
, ppos
);
831 if (old
!= *(int *)table
->data
)
832 pr_warn_once("sysctl attribute %s changed by %s[%d]\n",
833 table
->procname
, current
->comm
,
834 task_pid_nr(current
));
840 * proc_douintvec - read a vector of unsigned integers
841 * @table: the sysctl table
842 * @write: %TRUE if this is a write to the sysctl file
843 * @buffer: the user buffer
844 * @lenp: the size of the user buffer
845 * @ppos: file position
847 * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
848 * values from/to the user buffer, treated as an ASCII string.
850 * Returns 0 on success.
852 int proc_douintvec(struct ctl_table
*table
, int write
, void *buffer
,
853 size_t *lenp
, loff_t
*ppos
)
855 return do_proc_douintvec(table
, write
, buffer
, lenp
, ppos
,
856 do_proc_douintvec_conv
, NULL
);
860 * Taint values can only be increased
861 * This means we can safely use a temporary.
863 static int proc_taint(struct ctl_table
*table
, int write
,
864 void *buffer
, size_t *lenp
, loff_t
*ppos
)
867 unsigned long tmptaint
= get_taint();
870 if (write
&& !capable(CAP_SYS_ADMIN
))
875 err
= proc_doulongvec_minmax(&t
, write
, buffer
, lenp
, ppos
);
883 * If we are relying on panic_on_taint not producing
884 * false positives due to userspace input, bail out
885 * before setting the requested taint flags.
887 if (panic_on_taint_nousertaint
&& (tmptaint
& panic_on_taint
))
891 * Poor man's atomic or. Not worth adding a primitive
892 * to everyone's atomic.h for this
894 for (i
= 0; i
< TAINT_FLAGS_COUNT
; i
++)
895 if ((1UL << i
) & tmptaint
)
896 add_taint(i
, LOCKDEP_STILL_OK
);
903 static int proc_dointvec_minmax_sysadmin(struct ctl_table
*table
, int write
,
904 void *buffer
, size_t *lenp
, loff_t
*ppos
)
906 if (write
&& !capable(CAP_SYS_ADMIN
))
909 return proc_dointvec_minmax(table
, write
, buffer
, lenp
, ppos
);
914 * struct do_proc_dointvec_minmax_conv_param - proc_dointvec_minmax() range checking structure
915 * @min: pointer to minimum allowable value
916 * @max: pointer to maximum allowable value
918 * The do_proc_dointvec_minmax_conv_param structure provides the
919 * minimum and maximum values for doing range checking for those sysctl
920 * parameters that use the proc_dointvec_minmax() handler.
922 struct do_proc_dointvec_minmax_conv_param
{
927 static int do_proc_dointvec_minmax_conv(bool *negp
, unsigned long *lvalp
,
929 int write
, void *data
)
932 struct do_proc_dointvec_minmax_conv_param
*param
= data
;
934 * If writing, first do so via a temporary local int so we can
935 * bounds-check it before touching *valp.
937 int *ip
= write
? &tmp
: valp
;
939 ret
= do_proc_dointvec_conv(negp
, lvalp
, ip
, write
, data
);
944 if ((param
->min
&& *param
->min
> tmp
) ||
945 (param
->max
&& *param
->max
< tmp
))
954 * proc_dointvec_minmax - read a vector of integers with min/max values
955 * @table: the sysctl table
956 * @write: %TRUE if this is a write to the sysctl file
957 * @buffer: the user buffer
958 * @lenp: the size of the user buffer
959 * @ppos: file position
961 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
962 * values from/to the user buffer, treated as an ASCII string.
964 * This routine will ensure the values are within the range specified by
965 * table->extra1 (min) and table->extra2 (max).
967 * Returns 0 on success or -EINVAL on write when the range check fails.
969 int proc_dointvec_minmax(struct ctl_table
*table
, int write
,
970 void *buffer
, size_t *lenp
, loff_t
*ppos
)
972 struct do_proc_dointvec_minmax_conv_param param
= {
973 .min
= (int *) table
->extra1
,
974 .max
= (int *) table
->extra2
,
976 return do_proc_dointvec(table
, write
, buffer
, lenp
, ppos
,
977 do_proc_dointvec_minmax_conv
, ¶m
);
981 * struct do_proc_douintvec_minmax_conv_param - proc_douintvec_minmax() range checking structure
982 * @min: pointer to minimum allowable value
983 * @max: pointer to maximum allowable value
985 * The do_proc_douintvec_minmax_conv_param structure provides the
986 * minimum and maximum values for doing range checking for those sysctl
987 * parameters that use the proc_douintvec_minmax() handler.
989 struct do_proc_douintvec_minmax_conv_param
{
994 static int do_proc_douintvec_minmax_conv(unsigned long *lvalp
,
996 int write
, void *data
)
1000 struct do_proc_douintvec_minmax_conv_param
*param
= data
;
1001 /* write via temporary local uint for bounds-checking */
1002 unsigned int *up
= write
? &tmp
: valp
;
1004 ret
= do_proc_douintvec_conv(lvalp
, up
, write
, data
);
1009 if ((param
->min
&& *param
->min
> tmp
) ||
1010 (param
->max
&& *param
->max
< tmp
))
1020 * proc_douintvec_minmax - read a vector of unsigned ints with min/max values
1021 * @table: the sysctl table
1022 * @write: %TRUE if this is a write to the sysctl file
1023 * @buffer: the user buffer
1024 * @lenp: the size of the user buffer
1025 * @ppos: file position
1027 * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
1028 * values from/to the user buffer, treated as an ASCII string. Negative
1029 * strings are not allowed.
1031 * This routine will ensure the values are within the range specified by
1032 * table->extra1 (min) and table->extra2 (max). There is a final sanity
1033 * check for UINT_MAX to avoid having to support wrap around uses from
1036 * Returns 0 on success or -ERANGE on write when the range check fails.
1038 int proc_douintvec_minmax(struct ctl_table
*table
, int write
,
1039 void *buffer
, size_t *lenp
, loff_t
*ppos
)
1041 struct do_proc_douintvec_minmax_conv_param param
= {
1042 .min
= (unsigned int *) table
->extra1
,
1043 .max
= (unsigned int *) table
->extra2
,
1045 return do_proc_douintvec(table
, write
, buffer
, lenp
, ppos
,
1046 do_proc_douintvec_minmax_conv
, ¶m
);
1050 * proc_dou8vec_minmax - read a vector of unsigned chars with min/max values
1051 * @table: the sysctl table
1052 * @write: %TRUE if this is a write to the sysctl file
1053 * @buffer: the user buffer
1054 * @lenp: the size of the user buffer
1055 * @ppos: file position
1057 * Reads/writes up to table->maxlen/sizeof(u8) unsigned chars
1058 * values from/to the user buffer, treated as an ASCII string. Negative
1059 * strings are not allowed.
1061 * This routine will ensure the values are within the range specified by
1062 * table->extra1 (min) and table->extra2 (max).
1064 * Returns 0 on success or an error on write when the range check fails.
1066 int proc_dou8vec_minmax(struct ctl_table
*table
, int write
,
1067 void *buffer
, size_t *lenp
, loff_t
*ppos
)
1069 struct ctl_table tmp
;
1070 unsigned int min
= 0, max
= 255U, val
;
1071 u8
*data
= table
->data
;
1072 struct do_proc_douintvec_minmax_conv_param param
= {
1078 /* Do not support arrays yet. */
1079 if (table
->maxlen
!= sizeof(u8
))
1082 if (table
->extra1
) {
1083 min
= *(unsigned int *) table
->extra1
;
1087 if (table
->extra2
) {
1088 max
= *(unsigned int *) table
->extra2
;
1095 tmp
.maxlen
= sizeof(val
);
1098 res
= do_proc_douintvec(&tmp
, write
, buffer
, lenp
, ppos
,
1099 do_proc_douintvec_minmax_conv
, ¶m
);
1106 EXPORT_SYMBOL_GPL(proc_dou8vec_minmax
);
1108 static int do_proc_dopipe_max_size_conv(unsigned long *lvalp
,
1110 int write
, void *data
)
1115 val
= round_pipe_size(*lvalp
);
1121 unsigned int val
= *valp
;
1122 *lvalp
= (unsigned long) val
;
1128 static int proc_dopipe_max_size(struct ctl_table
*table
, int write
,
1129 void *buffer
, size_t *lenp
, loff_t
*ppos
)
1131 return do_proc_douintvec(table
, write
, buffer
, lenp
, ppos
,
1132 do_proc_dopipe_max_size_conv
, NULL
);
1135 static void validate_coredump_safety(void)
1137 #ifdef CONFIG_COREDUMP
1138 if (suid_dumpable
== SUID_DUMP_ROOT
&&
1139 core_pattern
[0] != '/' && core_pattern
[0] != '|') {
1141 "Unsafe core_pattern used with fs.suid_dumpable=2.\n"
1142 "Pipe handler or fully qualified core dump path required.\n"
1143 "Set kernel.core_pattern before fs.suid_dumpable.\n"
1149 static int proc_dointvec_minmax_coredump(struct ctl_table
*table
, int write
,
1150 void *buffer
, size_t *lenp
, loff_t
*ppos
)
1152 int error
= proc_dointvec_minmax(table
, write
, buffer
, lenp
, ppos
);
1154 validate_coredump_safety();
1158 #ifdef CONFIG_COREDUMP
1159 static int proc_dostring_coredump(struct ctl_table
*table
, int write
,
1160 void *buffer
, size_t *lenp
, loff_t
*ppos
)
1162 int error
= proc_dostring(table
, write
, buffer
, lenp
, ppos
);
1164 validate_coredump_safety();
1169 #ifdef CONFIG_MAGIC_SYSRQ
1170 static int sysrq_sysctl_handler(struct ctl_table
*table
, int write
,
1171 void *buffer
, size_t *lenp
, loff_t
*ppos
)
1177 ret
= __do_proc_dointvec(&tmp
, table
, write
, buffer
,
1178 lenp
, ppos
, NULL
, NULL
);
1183 sysrq_toggle_support(tmp
);
1189 static int __do_proc_doulongvec_minmax(void *data
, struct ctl_table
*table
,
1190 int write
, void *buffer
, size_t *lenp
, loff_t
*ppos
,
1191 unsigned long convmul
, unsigned long convdiv
)
1193 unsigned long *i
, *min
, *max
;
1194 int vleft
, first
= 1, err
= 0;
1198 if (!data
|| !table
->maxlen
|| !*lenp
|| (*ppos
&& !write
)) {
1203 i
= (unsigned long *) data
;
1204 min
= (unsigned long *) table
->extra1
;
1205 max
= (unsigned long *) table
->extra2
;
1206 vleft
= table
->maxlen
/ sizeof(unsigned long);
1210 if (proc_first_pos_non_zero_ignore(ppos
, table
))
1213 if (left
> PAGE_SIZE
- 1)
1214 left
= PAGE_SIZE
- 1;
1218 for (; left
&& vleft
--; i
++, first
= 0) {
1224 left
-= proc_skip_spaces(&p
);
1228 err
= proc_get_long(&p
, &left
, &val
, &neg
,
1230 sizeof(proc_wspace_sep
), NULL
);
1235 val
= convmul
* val
/ convdiv
;
1236 if ((min
&& val
< *min
) || (max
&& val
> *max
)) {
1242 val
= convdiv
* (*i
) / convmul
;
1244 proc_put_char(&buffer
, &left
, '\t');
1245 proc_put_long(&buffer
, &left
, val
, false);
1249 if (!write
&& !first
&& left
&& !err
)
1250 proc_put_char(&buffer
, &left
, '\n');
1252 left
-= proc_skip_spaces(&p
);
1254 return err
? : -EINVAL
;
1261 static int do_proc_doulongvec_minmax(struct ctl_table
*table
, int write
,
1262 void *buffer
, size_t *lenp
, loff_t
*ppos
, unsigned long convmul
,
1263 unsigned long convdiv
)
1265 return __do_proc_doulongvec_minmax(table
->data
, table
, write
,
1266 buffer
, lenp
, ppos
, convmul
, convdiv
);
1270 * proc_doulongvec_minmax - read a vector of long integers with min/max values
1271 * @table: the sysctl table
1272 * @write: %TRUE if this is a write to the sysctl file
1273 * @buffer: the user buffer
1274 * @lenp: the size of the user buffer
1275 * @ppos: file position
1277 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
1278 * values from/to the user buffer, treated as an ASCII string.
1280 * This routine will ensure the values are within the range specified by
1281 * table->extra1 (min) and table->extra2 (max).
1283 * Returns 0 on success.
1285 int proc_doulongvec_minmax(struct ctl_table
*table
, int write
,
1286 void *buffer
, size_t *lenp
, loff_t
*ppos
)
1288 return do_proc_doulongvec_minmax(table
, write
, buffer
, lenp
, ppos
, 1l, 1l);
1292 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
1293 * @table: the sysctl table
1294 * @write: %TRUE if this is a write to the sysctl file
1295 * @buffer: the user buffer
1296 * @lenp: the size of the user buffer
1297 * @ppos: file position
1299 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
1300 * values from/to the user buffer, treated as an ASCII string. The values
1301 * are treated as milliseconds, and converted to jiffies when they are stored.
1303 * This routine will ensure the values are within the range specified by
1304 * table->extra1 (min) and table->extra2 (max).
1306 * Returns 0 on success.
1308 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table
*table
, int write
,
1309 void *buffer
, size_t *lenp
, loff_t
*ppos
)
1311 return do_proc_doulongvec_minmax(table
, write
, buffer
,
1312 lenp
, ppos
, HZ
, 1000l);
1316 static int do_proc_dointvec_jiffies_conv(bool *negp
, unsigned long *lvalp
,
1318 int write
, void *data
)
1321 if (*lvalp
> INT_MAX
/ HZ
)
1323 *valp
= *negp
? -(*lvalp
*HZ
) : (*lvalp
*HZ
);
1329 lval
= -(unsigned long)val
;
1332 lval
= (unsigned long)val
;
1339 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp
, unsigned long *lvalp
,
1341 int write
, void *data
)
1344 if (USER_HZ
< HZ
&& *lvalp
> (LONG_MAX
/ HZ
) * USER_HZ
)
1346 *valp
= clock_t_to_jiffies(*negp
? -*lvalp
: *lvalp
);
1352 lval
= -(unsigned long)val
;
1355 lval
= (unsigned long)val
;
1357 *lvalp
= jiffies_to_clock_t(lval
);
1362 static int do_proc_dointvec_ms_jiffies_conv(bool *negp
, unsigned long *lvalp
,
1364 int write
, void *data
)
1367 unsigned long jif
= msecs_to_jiffies(*negp
? -*lvalp
: *lvalp
);
1377 lval
= -(unsigned long)val
;
1380 lval
= (unsigned long)val
;
1382 *lvalp
= jiffies_to_msecs(lval
);
1388 * proc_dointvec_jiffies - read a vector of integers as seconds
1389 * @table: the sysctl table
1390 * @write: %TRUE if this is a write to the sysctl file
1391 * @buffer: the user buffer
1392 * @lenp: the size of the user buffer
1393 * @ppos: file position
1395 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1396 * values from/to the user buffer, treated as an ASCII string.
1397 * The values read are assumed to be in seconds, and are converted into
1400 * Returns 0 on success.
1402 int proc_dointvec_jiffies(struct ctl_table
*table
, int write
,
1403 void *buffer
, size_t *lenp
, loff_t
*ppos
)
1405 return do_proc_dointvec(table
,write
,buffer
,lenp
,ppos
,
1406 do_proc_dointvec_jiffies_conv
,NULL
);
1410 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
1411 * @table: the sysctl table
1412 * @write: %TRUE if this is a write to the sysctl file
1413 * @buffer: the user buffer
1414 * @lenp: the size of the user buffer
1415 * @ppos: pointer to the file position
1417 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1418 * values from/to the user buffer, treated as an ASCII string.
1419 * The values read are assumed to be in 1/USER_HZ seconds, and
1420 * are converted into jiffies.
1422 * Returns 0 on success.
1424 int proc_dointvec_userhz_jiffies(struct ctl_table
*table
, int write
,
1425 void *buffer
, size_t *lenp
, loff_t
*ppos
)
1427 return do_proc_dointvec(table
,write
,buffer
,lenp
,ppos
,
1428 do_proc_dointvec_userhz_jiffies_conv
,NULL
);
1432 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
1433 * @table: the sysctl table
1434 * @write: %TRUE if this is a write to the sysctl file
1435 * @buffer: the user buffer
1436 * @lenp: the size of the user buffer
1437 * @ppos: file position
1438 * @ppos: the current position in the file
1440 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1441 * values from/to the user buffer, treated as an ASCII string.
1442 * The values read are assumed to be in 1/1000 seconds, and
1443 * are converted into jiffies.
1445 * Returns 0 on success.
1447 int proc_dointvec_ms_jiffies(struct ctl_table
*table
, int write
, void *buffer
,
1448 size_t *lenp
, loff_t
*ppos
)
1450 return do_proc_dointvec(table
, write
, buffer
, lenp
, ppos
,
1451 do_proc_dointvec_ms_jiffies_conv
, NULL
);
1454 static int proc_do_cad_pid(struct ctl_table
*table
, int write
, void *buffer
,
1455 size_t *lenp
, loff_t
*ppos
)
1457 struct pid
*new_pid
;
1461 tmp
= pid_vnr(cad_pid
);
1463 r
= __do_proc_dointvec(&tmp
, table
, write
, buffer
,
1464 lenp
, ppos
, NULL
, NULL
);
1468 new_pid
= find_get_pid(tmp
);
1472 put_pid(xchg(&cad_pid
, new_pid
));
1477 * proc_do_large_bitmap - read/write from/to a large bitmap
1478 * @table: the sysctl table
1479 * @write: %TRUE if this is a write to the sysctl file
1480 * @buffer: the user buffer
1481 * @lenp: the size of the user buffer
1482 * @ppos: file position
1484 * The bitmap is stored at table->data and the bitmap length (in bits)
1487 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
1488 * large bitmaps may be represented in a compact manner. Writing into
1489 * the file will clear the bitmap then update it with the given input.
1491 * Returns 0 on success.
1493 int proc_do_large_bitmap(struct ctl_table
*table
, int write
,
1494 void *buffer
, size_t *lenp
, loff_t
*ppos
)
1498 size_t left
= *lenp
;
1499 unsigned long bitmap_len
= table
->maxlen
;
1500 unsigned long *bitmap
= *(unsigned long **) table
->data
;
1501 unsigned long *tmp_bitmap
= NULL
;
1502 char tr_a
[] = { '-', ',', '\n' }, tr_b
[] = { ',', '\n', 0 }, c
;
1504 if (!bitmap
|| !bitmap_len
|| !left
|| (*ppos
&& !write
)) {
1513 if (left
> PAGE_SIZE
- 1) {
1514 left
= PAGE_SIZE
- 1;
1515 /* How much of the buffer we'll skip this pass */
1516 skipped
= *lenp
- left
;
1519 tmp_bitmap
= bitmap_zalloc(bitmap_len
, GFP_KERNEL
);
1522 proc_skip_char(&p
, &left
, '\n');
1523 while (!err
&& left
) {
1524 unsigned long val_a
, val_b
;
1528 /* In case we stop parsing mid-number, we can reset */
1530 err
= proc_get_long(&p
, &left
, &val_a
, &neg
, tr_a
,
1533 * If we consumed the entirety of a truncated buffer or
1534 * only one char is left (may be a "-"), then stop here,
1535 * reset, & come back for more.
1537 if ((left
<= 1) && skipped
) {
1544 if (val_a
>= bitmap_len
|| neg
) {
1556 err
= proc_get_long(&p
, &left
, &val_b
,
1557 &neg
, tr_b
, sizeof(tr_b
),
1560 * If we consumed all of a truncated buffer or
1561 * then stop here, reset, & come back for more.
1563 if (!left
&& skipped
) {
1570 if (val_b
>= bitmap_len
|| neg
||
1581 bitmap_set(tmp_bitmap
, val_a
, val_b
- val_a
+ 1);
1583 proc_skip_char(&p
, &left
, '\n');
1587 unsigned long bit_a
, bit_b
= 0;
1590 bit_a
= find_next_bit(bitmap
, bitmap_len
, bit_b
);
1591 if (bit_a
>= bitmap_len
)
1593 bit_b
= find_next_zero_bit(bitmap
, bitmap_len
,
1597 proc_put_char(&buffer
, &left
, ',');
1598 proc_put_long(&buffer
, &left
, bit_a
, false);
1599 if (bit_a
!= bit_b
) {
1600 proc_put_char(&buffer
, &left
, '-');
1601 proc_put_long(&buffer
, &left
, bit_b
, false);
1606 proc_put_char(&buffer
, &left
, '\n');
1612 bitmap_or(bitmap
, bitmap
, tmp_bitmap
, bitmap_len
);
1614 bitmap_copy(bitmap
, tmp_bitmap
, bitmap_len
);
1620 bitmap_free(tmp_bitmap
);
1624 #else /* CONFIG_PROC_SYSCTL */
1626 int proc_dostring(struct ctl_table
*table
, int write
,
1627 void *buffer
, size_t *lenp
, loff_t
*ppos
)
1632 int proc_dointvec(struct ctl_table
*table
, int write
,
1633 void *buffer
, size_t *lenp
, loff_t
*ppos
)
1638 int proc_douintvec(struct ctl_table
*table
, int write
,
1639 void *buffer
, size_t *lenp
, loff_t
*ppos
)
1644 int proc_dointvec_minmax(struct ctl_table
*table
, int write
,
1645 void *buffer
, size_t *lenp
, loff_t
*ppos
)
1650 int proc_douintvec_minmax(struct ctl_table
*table
, int write
,
1651 void *buffer
, size_t *lenp
, loff_t
*ppos
)
1656 int proc_dou8vec_minmax(struct ctl_table
*table
, int write
,
1657 void *buffer
, size_t *lenp
, loff_t
*ppos
)
1662 int proc_dointvec_jiffies(struct ctl_table
*table
, int write
,
1663 void *buffer
, size_t *lenp
, loff_t
*ppos
)
1668 int proc_dointvec_userhz_jiffies(struct ctl_table
*table
, int write
,
1669 void *buffer
, size_t *lenp
, loff_t
*ppos
)
1674 int proc_dointvec_ms_jiffies(struct ctl_table
*table
, int write
,
1675 void *buffer
, size_t *lenp
, loff_t
*ppos
)
1680 int proc_doulongvec_minmax(struct ctl_table
*table
, int write
,
1681 void *buffer
, size_t *lenp
, loff_t
*ppos
)
1686 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table
*table
, int write
,
1687 void *buffer
, size_t *lenp
, loff_t
*ppos
)
1692 int proc_do_large_bitmap(struct ctl_table
*table
, int write
,
1693 void *buffer
, size_t *lenp
, loff_t
*ppos
)
1698 #endif /* CONFIG_PROC_SYSCTL */
1700 #if defined(CONFIG_SYSCTL)
1701 int proc_do_static_key(struct ctl_table
*table
, int write
,
1702 void *buffer
, size_t *lenp
, loff_t
*ppos
)
1704 struct static_key
*key
= (struct static_key
*)table
->data
;
1705 static DEFINE_MUTEX(static_key_mutex
);
1707 struct ctl_table tmp
= {
1709 .maxlen
= sizeof(val
),
1710 .mode
= table
->mode
,
1711 .extra1
= SYSCTL_ZERO
,
1712 .extra2
= SYSCTL_ONE
,
1715 if (write
&& !capable(CAP_SYS_ADMIN
))
1718 mutex_lock(&static_key_mutex
);
1719 val
= static_key_enabled(key
);
1720 ret
= proc_dointvec_minmax(&tmp
, write
, buffer
, lenp
, ppos
);
1721 if (write
&& !ret
) {
1723 static_key_enable(key
);
1725 static_key_disable(key
);
1727 mutex_unlock(&static_key_mutex
);
1731 static struct ctl_table kern_table
[] = {
1733 .procname
= "sched_child_runs_first",
1734 .data
= &sysctl_sched_child_runs_first
,
1735 .maxlen
= sizeof(unsigned int),
1737 .proc_handler
= proc_dointvec
,
1739 #ifdef CONFIG_SCHEDSTATS
1741 .procname
= "sched_schedstats",
1743 .maxlen
= sizeof(unsigned int),
1745 .proc_handler
= sysctl_schedstats
,
1746 .extra1
= SYSCTL_ZERO
,
1747 .extra2
= SYSCTL_ONE
,
1749 #endif /* CONFIG_SCHEDSTATS */
1750 #ifdef CONFIG_NUMA_BALANCING
1752 .procname
= "numa_balancing",
1753 .data
= NULL
, /* filled in by handler */
1754 .maxlen
= sizeof(unsigned int),
1756 .proc_handler
= sysctl_numa_balancing
,
1757 .extra1
= SYSCTL_ZERO
,
1758 .extra2
= SYSCTL_ONE
,
1760 #endif /* CONFIG_NUMA_BALANCING */
1762 .procname
= "sched_rt_period_us",
1763 .data
= &sysctl_sched_rt_period
,
1764 .maxlen
= sizeof(unsigned int),
1766 .proc_handler
= sched_rt_handler
,
1769 .procname
= "sched_rt_runtime_us",
1770 .data
= &sysctl_sched_rt_runtime
,
1771 .maxlen
= sizeof(int),
1773 .proc_handler
= sched_rt_handler
,
1776 .procname
= "sched_deadline_period_max_us",
1777 .data
= &sysctl_sched_dl_period_max
,
1778 .maxlen
= sizeof(unsigned int),
1780 .proc_handler
= proc_dointvec
,
1783 .procname
= "sched_deadline_period_min_us",
1784 .data
= &sysctl_sched_dl_period_min
,
1785 .maxlen
= sizeof(unsigned int),
1787 .proc_handler
= proc_dointvec
,
1790 .procname
= "sched_rr_timeslice_ms",
1791 .data
= &sysctl_sched_rr_timeslice
,
1792 .maxlen
= sizeof(int),
1794 .proc_handler
= sched_rr_handler
,
1796 #ifdef CONFIG_UCLAMP_TASK
1798 .procname
= "sched_util_clamp_min",
1799 .data
= &sysctl_sched_uclamp_util_min
,
1800 .maxlen
= sizeof(unsigned int),
1802 .proc_handler
= sysctl_sched_uclamp_handler
,
1805 .procname
= "sched_util_clamp_max",
1806 .data
= &sysctl_sched_uclamp_util_max
,
1807 .maxlen
= sizeof(unsigned int),
1809 .proc_handler
= sysctl_sched_uclamp_handler
,
1812 .procname
= "sched_util_clamp_min_rt_default",
1813 .data
= &sysctl_sched_uclamp_util_min_rt_default
,
1814 .maxlen
= sizeof(unsigned int),
1816 .proc_handler
= sysctl_sched_uclamp_handler
,
1819 #ifdef CONFIG_SCHED_AUTOGROUP
1821 .procname
= "sched_autogroup_enabled",
1822 .data
= &sysctl_sched_autogroup_enabled
,
1823 .maxlen
= sizeof(unsigned int),
1825 .proc_handler
= proc_dointvec_minmax
,
1826 .extra1
= SYSCTL_ZERO
,
1827 .extra2
= SYSCTL_ONE
,
1830 #ifdef CONFIG_CFS_BANDWIDTH
1832 .procname
= "sched_cfs_bandwidth_slice_us",
1833 .data
= &sysctl_sched_cfs_bandwidth_slice
,
1834 .maxlen
= sizeof(unsigned int),
1836 .proc_handler
= proc_dointvec_minmax
,
1837 .extra1
= SYSCTL_ONE
,
1840 #if defined(CONFIG_ENERGY_MODEL) && defined(CONFIG_CPU_FREQ_GOV_SCHEDUTIL)
1842 .procname
= "sched_energy_aware",
1843 .data
= &sysctl_sched_energy_aware
,
1844 .maxlen
= sizeof(unsigned int),
1846 .proc_handler
= sched_energy_aware_handler
,
1847 .extra1
= SYSCTL_ZERO
,
1848 .extra2
= SYSCTL_ONE
,
1851 #ifdef CONFIG_PROVE_LOCKING
1853 .procname
= "prove_locking",
1854 .data
= &prove_locking
,
1855 .maxlen
= sizeof(int),
1857 .proc_handler
= proc_dointvec
,
1860 #ifdef CONFIG_LOCK_STAT
1862 .procname
= "lock_stat",
1864 .maxlen
= sizeof(int),
1866 .proc_handler
= proc_dointvec
,
1870 .procname
= "panic",
1871 .data
= &panic_timeout
,
1872 .maxlen
= sizeof(int),
1874 .proc_handler
= proc_dointvec
,
1876 #ifdef CONFIG_COREDUMP
1878 .procname
= "core_uses_pid",
1879 .data
= &core_uses_pid
,
1880 .maxlen
= sizeof(int),
1882 .proc_handler
= proc_dointvec
,
1885 .procname
= "core_pattern",
1886 .data
= core_pattern
,
1887 .maxlen
= CORENAME_MAX_SIZE
,
1889 .proc_handler
= proc_dostring_coredump
,
1892 .procname
= "core_pipe_limit",
1893 .data
= &core_pipe_limit
,
1894 .maxlen
= sizeof(unsigned int),
1896 .proc_handler
= proc_dointvec
,
1899 #ifdef CONFIG_PROC_SYSCTL
1901 .procname
= "tainted",
1902 .maxlen
= sizeof(long),
1904 .proc_handler
= proc_taint
,
1907 .procname
= "sysctl_writes_strict",
1908 .data
= &sysctl_writes_strict
,
1909 .maxlen
= sizeof(int),
1911 .proc_handler
= proc_dointvec_minmax
,
1913 .extra2
= SYSCTL_ONE
,
1916 #ifdef CONFIG_LATENCYTOP
1918 .procname
= "latencytop",
1919 .data
= &latencytop_enabled
,
1920 .maxlen
= sizeof(int),
1922 .proc_handler
= sysctl_latencytop
,
1925 #ifdef CONFIG_BLK_DEV_INITRD
1927 .procname
= "real-root-dev",
1928 .data
= &real_root_dev
,
1929 .maxlen
= sizeof(int),
1931 .proc_handler
= proc_dointvec
,
1935 .procname
= "print-fatal-signals",
1936 .data
= &print_fatal_signals
,
1937 .maxlen
= sizeof(int),
1939 .proc_handler
= proc_dointvec
,
1943 .procname
= "reboot-cmd",
1944 .data
= reboot_command
,
1947 .proc_handler
= proc_dostring
,
1950 .procname
= "stop-a",
1951 .data
= &stop_a_enabled
,
1952 .maxlen
= sizeof (int),
1954 .proc_handler
= proc_dointvec
,
1957 .procname
= "scons-poweroff",
1958 .data
= &scons_pwroff
,
1959 .maxlen
= sizeof (int),
1961 .proc_handler
= proc_dointvec
,
1964 #ifdef CONFIG_SPARC64
1966 .procname
= "tsb-ratio",
1967 .data
= &sysctl_tsb_ratio
,
1968 .maxlen
= sizeof (int),
1970 .proc_handler
= proc_dointvec
,
1973 #ifdef CONFIG_PARISC
1975 .procname
= "soft-power",
1976 .data
= &pwrsw_enabled
,
1977 .maxlen
= sizeof (int),
1979 .proc_handler
= proc_dointvec
,
1982 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
1984 .procname
= "unaligned-trap",
1985 .data
= &unaligned_enabled
,
1986 .maxlen
= sizeof (int),
1988 .proc_handler
= proc_dointvec
,
1992 .procname
= "ctrl-alt-del",
1994 .maxlen
= sizeof(int),
1996 .proc_handler
= proc_dointvec
,
1998 #ifdef CONFIG_FUNCTION_TRACER
2000 .procname
= "ftrace_enabled",
2001 .data
= &ftrace_enabled
,
2002 .maxlen
= sizeof(int),
2004 .proc_handler
= ftrace_enable_sysctl
,
2007 #ifdef CONFIG_STACK_TRACER
2009 .procname
= "stack_tracer_enabled",
2010 .data
= &stack_tracer_enabled
,
2011 .maxlen
= sizeof(int),
2013 .proc_handler
= stack_trace_sysctl
,
2016 #ifdef CONFIG_TRACING
2018 .procname
= "ftrace_dump_on_oops",
2019 .data
= &ftrace_dump_on_oops
,
2020 .maxlen
= sizeof(int),
2022 .proc_handler
= proc_dointvec
,
2025 .procname
= "traceoff_on_warning",
2026 .data
= &__disable_trace_on_warning
,
2027 .maxlen
= sizeof(__disable_trace_on_warning
),
2029 .proc_handler
= proc_dointvec
,
2032 .procname
= "tracepoint_printk",
2033 .data
= &tracepoint_printk
,
2034 .maxlen
= sizeof(tracepoint_printk
),
2036 .proc_handler
= tracepoint_printk_sysctl
,
2039 #ifdef CONFIG_KEXEC_CORE
2041 .procname
= "kexec_load_disabled",
2042 .data
= &kexec_load_disabled
,
2043 .maxlen
= sizeof(int),
2045 /* only handle a transition from default "0" to "1" */
2046 .proc_handler
= proc_dointvec_minmax
,
2047 .extra1
= SYSCTL_ONE
,
2048 .extra2
= SYSCTL_ONE
,
2051 #ifdef CONFIG_MODULES
2053 .procname
= "modprobe",
2054 .data
= &modprobe_path
,
2055 .maxlen
= KMOD_PATH_LEN
,
2057 .proc_handler
= proc_dostring
,
2060 .procname
= "modules_disabled",
2061 .data
= &modules_disabled
,
2062 .maxlen
= sizeof(int),
2064 /* only handle a transition from default "0" to "1" */
2065 .proc_handler
= proc_dointvec_minmax
,
2066 .extra1
= SYSCTL_ONE
,
2067 .extra2
= SYSCTL_ONE
,
2070 #ifdef CONFIG_UEVENT_HELPER
2072 .procname
= "hotplug",
2073 .data
= &uevent_helper
,
2074 .maxlen
= UEVENT_HELPER_PATH_LEN
,
2076 .proc_handler
= proc_dostring
,
2079 #ifdef CONFIG_CHR_DEV_SG
2081 .procname
= "sg-big-buff",
2082 .data
= &sg_big_buff
,
2083 .maxlen
= sizeof (int),
2085 .proc_handler
= proc_dointvec
,
2088 #ifdef CONFIG_BSD_PROCESS_ACCT
2092 .maxlen
= 3*sizeof(int),
2094 .proc_handler
= proc_dointvec
,
2097 #ifdef CONFIG_MAGIC_SYSRQ
2099 .procname
= "sysrq",
2101 .maxlen
= sizeof (int),
2103 .proc_handler
= sysrq_sysctl_handler
,
2106 #ifdef CONFIG_PROC_SYSCTL
2108 .procname
= "cad_pid",
2110 .maxlen
= sizeof (int),
2112 .proc_handler
= proc_do_cad_pid
,
2116 .procname
= "threads-max",
2118 .maxlen
= sizeof(int),
2120 .proc_handler
= sysctl_max_threads
,
2123 .procname
= "random",
2125 .child
= random_table
,
2128 .procname
= "usermodehelper",
2130 .child
= usermodehelper_table
,
2132 #ifdef CONFIG_FW_LOADER_USER_HELPER
2134 .procname
= "firmware_config",
2136 .child
= firmware_config_table
,
2140 .procname
= "overflowuid",
2141 .data
= &overflowuid
,
2142 .maxlen
= sizeof(int),
2144 .proc_handler
= proc_dointvec_minmax
,
2145 .extra1
= &minolduid
,
2146 .extra2
= &maxolduid
,
2149 .procname
= "overflowgid",
2150 .data
= &overflowgid
,
2151 .maxlen
= sizeof(int),
2153 .proc_handler
= proc_dointvec_minmax
,
2154 .extra1
= &minolduid
,
2155 .extra2
= &maxolduid
,
2159 .procname
= "userprocess_debug",
2160 .data
= &show_unhandled_signals
,
2161 .maxlen
= sizeof(int),
2163 .proc_handler
= proc_dointvec
,
2168 .procname
= "oops_all_cpu_backtrace",
2169 .data
= &sysctl_oops_all_cpu_backtrace
,
2170 .maxlen
= sizeof(int),
2172 .proc_handler
= proc_dointvec_minmax
,
2173 .extra1
= SYSCTL_ZERO
,
2174 .extra2
= SYSCTL_ONE
,
2176 #endif /* CONFIG_SMP */
2178 .procname
= "pid_max",
2180 .maxlen
= sizeof (int),
2182 .proc_handler
= proc_dointvec_minmax
,
2183 .extra1
= &pid_max_min
,
2184 .extra2
= &pid_max_max
,
2187 .procname
= "panic_on_oops",
2188 .data
= &panic_on_oops
,
2189 .maxlen
= sizeof(int),
2191 .proc_handler
= proc_dointvec
,
2194 .procname
= "panic_print",
2195 .data
= &panic_print
,
2196 .maxlen
= sizeof(unsigned long),
2198 .proc_handler
= proc_doulongvec_minmax
,
2200 #if defined CONFIG_PRINTK
2202 .procname
= "printk",
2203 .data
= &console_loglevel
,
2204 .maxlen
= 4*sizeof(int),
2206 .proc_handler
= proc_dointvec
,
2209 .procname
= "printk_ratelimit",
2210 .data
= &printk_ratelimit_state
.interval
,
2211 .maxlen
= sizeof(int),
2213 .proc_handler
= proc_dointvec_jiffies
,
2216 .procname
= "printk_ratelimit_burst",
2217 .data
= &printk_ratelimit_state
.burst
,
2218 .maxlen
= sizeof(int),
2220 .proc_handler
= proc_dointvec
,
2223 .procname
= "printk_delay",
2224 .data
= &printk_delay_msec
,
2225 .maxlen
= sizeof(int),
2227 .proc_handler
= proc_dointvec_minmax
,
2228 .extra1
= SYSCTL_ZERO
,
2229 .extra2
= &ten_thousand
,
2232 .procname
= "printk_devkmsg",
2233 .data
= devkmsg_log_str
,
2234 .maxlen
= DEVKMSG_STR_MAX_SIZE
,
2236 .proc_handler
= devkmsg_sysctl_set_loglvl
,
2239 .procname
= "dmesg_restrict",
2240 .data
= &dmesg_restrict
,
2241 .maxlen
= sizeof(int),
2243 .proc_handler
= proc_dointvec_minmax_sysadmin
,
2244 .extra1
= SYSCTL_ZERO
,
2245 .extra2
= SYSCTL_ONE
,
2248 .procname
= "kptr_restrict",
2249 .data
= &kptr_restrict
,
2250 .maxlen
= sizeof(int),
2252 .proc_handler
= proc_dointvec_minmax_sysadmin
,
2253 .extra1
= SYSCTL_ZERO
,
2258 .procname
= "ngroups_max",
2259 .data
= &ngroups_max
,
2260 .maxlen
= sizeof (int),
2262 .proc_handler
= proc_dointvec
,
2265 .procname
= "cap_last_cap",
2266 .data
= (void *)&cap_last_cap
,
2267 .maxlen
= sizeof(int),
2269 .proc_handler
= proc_dointvec
,
2271 #if defined(CONFIG_LOCKUP_DETECTOR)
2273 .procname
= "watchdog",
2274 .data
= &watchdog_user_enabled
,
2275 .maxlen
= sizeof(int),
2277 .proc_handler
= proc_watchdog
,
2278 .extra1
= SYSCTL_ZERO
,
2279 .extra2
= SYSCTL_ONE
,
2282 .procname
= "watchdog_thresh",
2283 .data
= &watchdog_thresh
,
2284 .maxlen
= sizeof(int),
2286 .proc_handler
= proc_watchdog_thresh
,
2287 .extra1
= SYSCTL_ZERO
,
2291 .procname
= "nmi_watchdog",
2292 .data
= &nmi_watchdog_user_enabled
,
2293 .maxlen
= sizeof(int),
2294 .mode
= NMI_WATCHDOG_SYSCTL_PERM
,
2295 .proc_handler
= proc_nmi_watchdog
,
2296 .extra1
= SYSCTL_ZERO
,
2297 .extra2
= SYSCTL_ONE
,
2300 .procname
= "watchdog_cpumask",
2301 .data
= &watchdog_cpumask_bits
,
2304 .proc_handler
= proc_watchdog_cpumask
,
2306 #ifdef CONFIG_SOFTLOCKUP_DETECTOR
2308 .procname
= "soft_watchdog",
2309 .data
= &soft_watchdog_user_enabled
,
2310 .maxlen
= sizeof(int),
2312 .proc_handler
= proc_soft_watchdog
,
2313 .extra1
= SYSCTL_ZERO
,
2314 .extra2
= SYSCTL_ONE
,
2317 .procname
= "softlockup_panic",
2318 .data
= &softlockup_panic
,
2319 .maxlen
= sizeof(int),
2321 .proc_handler
= proc_dointvec_minmax
,
2322 .extra1
= SYSCTL_ZERO
,
2323 .extra2
= SYSCTL_ONE
,
2327 .procname
= "softlockup_all_cpu_backtrace",
2328 .data
= &sysctl_softlockup_all_cpu_backtrace
,
2329 .maxlen
= sizeof(int),
2331 .proc_handler
= proc_dointvec_minmax
,
2332 .extra1
= SYSCTL_ZERO
,
2333 .extra2
= SYSCTL_ONE
,
2335 #endif /* CONFIG_SMP */
2337 #ifdef CONFIG_HARDLOCKUP_DETECTOR
2339 .procname
= "hardlockup_panic",
2340 .data
= &hardlockup_panic
,
2341 .maxlen
= sizeof(int),
2343 .proc_handler
= proc_dointvec_minmax
,
2344 .extra1
= SYSCTL_ZERO
,
2345 .extra2
= SYSCTL_ONE
,
2349 .procname
= "hardlockup_all_cpu_backtrace",
2350 .data
= &sysctl_hardlockup_all_cpu_backtrace
,
2351 .maxlen
= sizeof(int),
2353 .proc_handler
= proc_dointvec_minmax
,
2354 .extra1
= SYSCTL_ZERO
,
2355 .extra2
= SYSCTL_ONE
,
2357 #endif /* CONFIG_SMP */
2361 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
2363 .procname
= "unknown_nmi_panic",
2364 .data
= &unknown_nmi_panic
,
2365 .maxlen
= sizeof (int),
2367 .proc_handler
= proc_dointvec
,
2371 #if (defined(CONFIG_X86_32) || defined(CONFIG_PARISC)) && \
2372 defined(CONFIG_DEBUG_STACKOVERFLOW)
2374 .procname
= "panic_on_stackoverflow",
2375 .data
= &sysctl_panic_on_stackoverflow
,
2376 .maxlen
= sizeof(int),
2378 .proc_handler
= proc_dointvec
,
2381 #if defined(CONFIG_X86)
2383 .procname
= "panic_on_unrecovered_nmi",
2384 .data
= &panic_on_unrecovered_nmi
,
2385 .maxlen
= sizeof(int),
2387 .proc_handler
= proc_dointvec
,
2390 .procname
= "panic_on_io_nmi",
2391 .data
= &panic_on_io_nmi
,
2392 .maxlen
= sizeof(int),
2394 .proc_handler
= proc_dointvec
,
2397 .procname
= "bootloader_type",
2398 .data
= &bootloader_type
,
2399 .maxlen
= sizeof (int),
2401 .proc_handler
= proc_dointvec
,
2404 .procname
= "bootloader_version",
2405 .data
= &bootloader_version
,
2406 .maxlen
= sizeof (int),
2408 .proc_handler
= proc_dointvec
,
2411 .procname
= "io_delay_type",
2412 .data
= &io_delay_type
,
2413 .maxlen
= sizeof(int),
2415 .proc_handler
= proc_dointvec
,
2418 #if defined(CONFIG_MMU)
2420 .procname
= "randomize_va_space",
2421 .data
= &randomize_va_space
,
2422 .maxlen
= sizeof(int),
2424 .proc_handler
= proc_dointvec
,
2427 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
2429 .procname
= "spin_retry",
2430 .data
= &spin_retry
,
2431 .maxlen
= sizeof (int),
2433 .proc_handler
= proc_dointvec
,
2436 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
2438 .procname
= "acpi_video_flags",
2439 .data
= &acpi_realmode_flags
,
2440 .maxlen
= sizeof (unsigned long),
2442 .proc_handler
= proc_doulongvec_minmax
,
2445 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
2447 .procname
= "ignore-unaligned-usertrap",
2448 .data
= &no_unaligned_warning
,
2449 .maxlen
= sizeof (int),
2451 .proc_handler
= proc_dointvec
,
2456 .procname
= "unaligned-dump-stack",
2457 .data
= &unaligned_dump_stack
,
2458 .maxlen
= sizeof (int),
2460 .proc_handler
= proc_dointvec
,
2463 #ifdef CONFIG_DETECT_HUNG_TASK
2466 .procname
= "hung_task_all_cpu_backtrace",
2467 .data
= &sysctl_hung_task_all_cpu_backtrace
,
2468 .maxlen
= sizeof(int),
2470 .proc_handler
= proc_dointvec_minmax
,
2471 .extra1
= SYSCTL_ZERO
,
2472 .extra2
= SYSCTL_ONE
,
2474 #endif /* CONFIG_SMP */
2476 .procname
= "hung_task_panic",
2477 .data
= &sysctl_hung_task_panic
,
2478 .maxlen
= sizeof(int),
2480 .proc_handler
= proc_dointvec_minmax
,
2481 .extra1
= SYSCTL_ZERO
,
2482 .extra2
= SYSCTL_ONE
,
2485 .procname
= "hung_task_check_count",
2486 .data
= &sysctl_hung_task_check_count
,
2487 .maxlen
= sizeof(int),
2489 .proc_handler
= proc_dointvec_minmax
,
2490 .extra1
= SYSCTL_ZERO
,
2493 .procname
= "hung_task_timeout_secs",
2494 .data
= &sysctl_hung_task_timeout_secs
,
2495 .maxlen
= sizeof(unsigned long),
2497 .proc_handler
= proc_dohung_task_timeout_secs
,
2498 .extra2
= &hung_task_timeout_max
,
2501 .procname
= "hung_task_check_interval_secs",
2502 .data
= &sysctl_hung_task_check_interval_secs
,
2503 .maxlen
= sizeof(unsigned long),
2505 .proc_handler
= proc_dohung_task_timeout_secs
,
2506 .extra2
= &hung_task_timeout_max
,
2509 .procname
= "hung_task_warnings",
2510 .data
= &sysctl_hung_task_warnings
,
2511 .maxlen
= sizeof(int),
2513 .proc_handler
= proc_dointvec_minmax
,
2517 #ifdef CONFIG_RT_MUTEXES
2519 .procname
= "max_lock_depth",
2520 .data
= &max_lock_depth
,
2521 .maxlen
= sizeof(int),
2523 .proc_handler
= proc_dointvec
,
2527 .procname
= "poweroff_cmd",
2528 .data
= &poweroff_cmd
,
2529 .maxlen
= POWEROFF_CMD_PATH_LEN
,
2531 .proc_handler
= proc_dostring
,
2537 .child
= key_sysctls
,
2540 #ifdef CONFIG_PERF_EVENTS
2542 * User-space scripts rely on the existence of this file
2543 * as a feature check for perf_events being enabled.
2545 * So it's an ABI, do not remove!
2548 .procname
= "perf_event_paranoid",
2549 .data
= &sysctl_perf_event_paranoid
,
2550 .maxlen
= sizeof(sysctl_perf_event_paranoid
),
2552 .proc_handler
= proc_dointvec
,
2555 .procname
= "perf_event_mlock_kb",
2556 .data
= &sysctl_perf_event_mlock
,
2557 .maxlen
= sizeof(sysctl_perf_event_mlock
),
2559 .proc_handler
= proc_dointvec
,
2562 .procname
= "perf_event_max_sample_rate",
2563 .data
= &sysctl_perf_event_sample_rate
,
2564 .maxlen
= sizeof(sysctl_perf_event_sample_rate
),
2566 .proc_handler
= perf_proc_update_handler
,
2567 .extra1
= SYSCTL_ONE
,
2570 .procname
= "perf_cpu_time_max_percent",
2571 .data
= &sysctl_perf_cpu_time_max_percent
,
2572 .maxlen
= sizeof(sysctl_perf_cpu_time_max_percent
),
2574 .proc_handler
= perf_cpu_time_max_percent_handler
,
2575 .extra1
= SYSCTL_ZERO
,
2576 .extra2
= &one_hundred
,
2579 .procname
= "perf_event_max_stack",
2580 .data
= &sysctl_perf_event_max_stack
,
2581 .maxlen
= sizeof(sysctl_perf_event_max_stack
),
2583 .proc_handler
= perf_event_max_stack_handler
,
2584 .extra1
= SYSCTL_ZERO
,
2585 .extra2
= &six_hundred_forty_kb
,
2588 .procname
= "perf_event_max_contexts_per_stack",
2589 .data
= &sysctl_perf_event_max_contexts_per_stack
,
2590 .maxlen
= sizeof(sysctl_perf_event_max_contexts_per_stack
),
2592 .proc_handler
= perf_event_max_stack_handler
,
2593 .extra1
= SYSCTL_ZERO
,
2594 .extra2
= &one_thousand
,
2598 .procname
= "panic_on_warn",
2599 .data
= &panic_on_warn
,
2600 .maxlen
= sizeof(int),
2602 .proc_handler
= proc_dointvec_minmax
,
2603 .extra1
= SYSCTL_ZERO
,
2604 .extra2
= SYSCTL_ONE
,
2606 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON)
2608 .procname
= "timer_migration",
2609 .data
= &sysctl_timer_migration
,
2610 .maxlen
= sizeof(unsigned int),
2612 .proc_handler
= timer_migration_handler
,
2613 .extra1
= SYSCTL_ZERO
,
2614 .extra2
= SYSCTL_ONE
,
2617 #ifdef CONFIG_BPF_SYSCALL
2619 .procname
= "unprivileged_bpf_disabled",
2620 .data
= &sysctl_unprivileged_bpf_disabled
,
2621 .maxlen
= sizeof(sysctl_unprivileged_bpf_disabled
),
2623 .proc_handler
= bpf_unpriv_handler
,
2624 .extra1
= SYSCTL_ZERO
,
2628 .procname
= "bpf_stats_enabled",
2629 .data
= &bpf_stats_enabled_key
.key
,
2630 .maxlen
= sizeof(bpf_stats_enabled_key
),
2632 .proc_handler
= bpf_stats_handler
,
2635 #if defined(CONFIG_TREE_RCU)
2637 .procname
= "panic_on_rcu_stall",
2638 .data
= &sysctl_panic_on_rcu_stall
,
2639 .maxlen
= sizeof(sysctl_panic_on_rcu_stall
),
2641 .proc_handler
= proc_dointvec_minmax
,
2642 .extra1
= SYSCTL_ZERO
,
2643 .extra2
= SYSCTL_ONE
,
2646 #if defined(CONFIG_TREE_RCU)
2648 .procname
= "max_rcu_stall_to_panic",
2649 .data
= &sysctl_max_rcu_stall_to_panic
,
2650 .maxlen
= sizeof(sysctl_max_rcu_stall_to_panic
),
2652 .proc_handler
= proc_dointvec_minmax
,
2653 .extra1
= SYSCTL_ONE
,
2654 .extra2
= SYSCTL_INT_MAX
,
2657 #ifdef CONFIG_STACKLEAK_RUNTIME_DISABLE
2659 .procname
= "stack_erasing",
2661 .maxlen
= sizeof(int),
2663 .proc_handler
= stack_erasing_sysctl
,
2664 .extra1
= SYSCTL_ZERO
,
2665 .extra2
= SYSCTL_ONE
,
2671 static struct ctl_table vm_table
[] = {
2673 .procname
= "overcommit_memory",
2674 .data
= &sysctl_overcommit_memory
,
2675 .maxlen
= sizeof(sysctl_overcommit_memory
),
2677 .proc_handler
= overcommit_policy_handler
,
2678 .extra1
= SYSCTL_ZERO
,
2682 .procname
= "panic_on_oom",
2683 .data
= &sysctl_panic_on_oom
,
2684 .maxlen
= sizeof(sysctl_panic_on_oom
),
2686 .proc_handler
= proc_dointvec_minmax
,
2687 .extra1
= SYSCTL_ZERO
,
2691 .procname
= "oom_kill_allocating_task",
2692 .data
= &sysctl_oom_kill_allocating_task
,
2693 .maxlen
= sizeof(sysctl_oom_kill_allocating_task
),
2695 .proc_handler
= proc_dointvec
,
2698 .procname
= "oom_dump_tasks",
2699 .data
= &sysctl_oom_dump_tasks
,
2700 .maxlen
= sizeof(sysctl_oom_dump_tasks
),
2702 .proc_handler
= proc_dointvec
,
2705 .procname
= "overcommit_ratio",
2706 .data
= &sysctl_overcommit_ratio
,
2707 .maxlen
= sizeof(sysctl_overcommit_ratio
),
2709 .proc_handler
= overcommit_ratio_handler
,
2712 .procname
= "overcommit_kbytes",
2713 .data
= &sysctl_overcommit_kbytes
,
2714 .maxlen
= sizeof(sysctl_overcommit_kbytes
),
2716 .proc_handler
= overcommit_kbytes_handler
,
2719 .procname
= "page-cluster",
2720 .data
= &page_cluster
,
2721 .maxlen
= sizeof(int),
2723 .proc_handler
= proc_dointvec_minmax
,
2724 .extra1
= SYSCTL_ZERO
,
2727 .procname
= "dirty_background_ratio",
2728 .data
= &dirty_background_ratio
,
2729 .maxlen
= sizeof(dirty_background_ratio
),
2731 .proc_handler
= dirty_background_ratio_handler
,
2732 .extra1
= SYSCTL_ZERO
,
2733 .extra2
= &one_hundred
,
2736 .procname
= "dirty_background_bytes",
2737 .data
= &dirty_background_bytes
,
2738 .maxlen
= sizeof(dirty_background_bytes
),
2740 .proc_handler
= dirty_background_bytes_handler
,
2744 .procname
= "dirty_ratio",
2745 .data
= &vm_dirty_ratio
,
2746 .maxlen
= sizeof(vm_dirty_ratio
),
2748 .proc_handler
= dirty_ratio_handler
,
2749 .extra1
= SYSCTL_ZERO
,
2750 .extra2
= &one_hundred
,
2753 .procname
= "dirty_bytes",
2754 .data
= &vm_dirty_bytes
,
2755 .maxlen
= sizeof(vm_dirty_bytes
),
2757 .proc_handler
= dirty_bytes_handler
,
2758 .extra1
= &dirty_bytes_min
,
2761 .procname
= "dirty_writeback_centisecs",
2762 .data
= &dirty_writeback_interval
,
2763 .maxlen
= sizeof(dirty_writeback_interval
),
2765 .proc_handler
= dirty_writeback_centisecs_handler
,
2768 .procname
= "dirty_expire_centisecs",
2769 .data
= &dirty_expire_interval
,
2770 .maxlen
= sizeof(dirty_expire_interval
),
2772 .proc_handler
= proc_dointvec_minmax
,
2773 .extra1
= SYSCTL_ZERO
,
2776 .procname
= "dirtytime_expire_seconds",
2777 .data
= &dirtytime_expire_interval
,
2778 .maxlen
= sizeof(dirtytime_expire_interval
),
2780 .proc_handler
= dirtytime_interval_handler
,
2781 .extra1
= SYSCTL_ZERO
,
2784 .procname
= "swappiness",
2785 .data
= &vm_swappiness
,
2786 .maxlen
= sizeof(vm_swappiness
),
2788 .proc_handler
= proc_dointvec_minmax
,
2789 .extra1
= SYSCTL_ZERO
,
2790 .extra2
= &two_hundred
,
2792 #ifdef CONFIG_HUGETLB_PAGE
2794 .procname
= "nr_hugepages",
2796 .maxlen
= sizeof(unsigned long),
2798 .proc_handler
= hugetlb_sysctl_handler
,
2802 .procname
= "nr_hugepages_mempolicy",
2804 .maxlen
= sizeof(unsigned long),
2806 .proc_handler
= &hugetlb_mempolicy_sysctl_handler
,
2809 .procname
= "numa_stat",
2810 .data
= &sysctl_vm_numa_stat
,
2811 .maxlen
= sizeof(int),
2813 .proc_handler
= sysctl_vm_numa_stat_handler
,
2814 .extra1
= SYSCTL_ZERO
,
2815 .extra2
= SYSCTL_ONE
,
2819 .procname
= "hugetlb_shm_group",
2820 .data
= &sysctl_hugetlb_shm_group
,
2821 .maxlen
= sizeof(gid_t
),
2823 .proc_handler
= proc_dointvec
,
2826 .procname
= "nr_overcommit_hugepages",
2828 .maxlen
= sizeof(unsigned long),
2830 .proc_handler
= hugetlb_overcommit_handler
,
2834 .procname
= "lowmem_reserve_ratio",
2835 .data
= &sysctl_lowmem_reserve_ratio
,
2836 .maxlen
= sizeof(sysctl_lowmem_reserve_ratio
),
2838 .proc_handler
= lowmem_reserve_ratio_sysctl_handler
,
2841 .procname
= "drop_caches",
2842 .data
= &sysctl_drop_caches
,
2843 .maxlen
= sizeof(int),
2845 .proc_handler
= drop_caches_sysctl_handler
,
2846 .extra1
= SYSCTL_ONE
,
2849 #ifdef CONFIG_COMPACTION
2851 .procname
= "compact_memory",
2853 .maxlen
= sizeof(int),
2855 .proc_handler
= sysctl_compaction_handler
,
2858 .procname
= "compaction_proactiveness",
2859 .data
= &sysctl_compaction_proactiveness
,
2860 .maxlen
= sizeof(sysctl_compaction_proactiveness
),
2862 .proc_handler
= proc_dointvec_minmax
,
2863 .extra1
= SYSCTL_ZERO
,
2864 .extra2
= &one_hundred
,
2867 .procname
= "extfrag_threshold",
2868 .data
= &sysctl_extfrag_threshold
,
2869 .maxlen
= sizeof(int),
2871 .proc_handler
= proc_dointvec_minmax
,
2872 .extra1
= &min_extfrag_threshold
,
2873 .extra2
= &max_extfrag_threshold
,
2876 .procname
= "compact_unevictable_allowed",
2877 .data
= &sysctl_compact_unevictable_allowed
,
2878 .maxlen
= sizeof(int),
2880 .proc_handler
= proc_dointvec_minmax_warn_RT_change
,
2881 .extra1
= SYSCTL_ZERO
,
2882 .extra2
= SYSCTL_ONE
,
2885 #endif /* CONFIG_COMPACTION */
2887 .procname
= "min_free_kbytes",
2888 .data
= &min_free_kbytes
,
2889 .maxlen
= sizeof(min_free_kbytes
),
2891 .proc_handler
= min_free_kbytes_sysctl_handler
,
2892 .extra1
= SYSCTL_ZERO
,
2895 .procname
= "watermark_boost_factor",
2896 .data
= &watermark_boost_factor
,
2897 .maxlen
= sizeof(watermark_boost_factor
),
2899 .proc_handler
= proc_dointvec_minmax
,
2900 .extra1
= SYSCTL_ZERO
,
2903 .procname
= "watermark_scale_factor",
2904 .data
= &watermark_scale_factor
,
2905 .maxlen
= sizeof(watermark_scale_factor
),
2907 .proc_handler
= watermark_scale_factor_sysctl_handler
,
2908 .extra1
= SYSCTL_ONE
,
2909 .extra2
= &one_thousand
,
2912 .procname
= "percpu_pagelist_fraction",
2913 .data
= &percpu_pagelist_fraction
,
2914 .maxlen
= sizeof(percpu_pagelist_fraction
),
2916 .proc_handler
= percpu_pagelist_fraction_sysctl_handler
,
2917 .extra1
= SYSCTL_ZERO
,
2920 .procname
= "page_lock_unfairness",
2921 .data
= &sysctl_page_lock_unfairness
,
2922 .maxlen
= sizeof(sysctl_page_lock_unfairness
),
2924 .proc_handler
= proc_dointvec_minmax
,
2925 .extra1
= SYSCTL_ZERO
,
2929 .procname
= "max_map_count",
2930 .data
= &sysctl_max_map_count
,
2931 .maxlen
= sizeof(sysctl_max_map_count
),
2933 .proc_handler
= proc_dointvec_minmax
,
2934 .extra1
= SYSCTL_ZERO
,
2938 .procname
= "nr_trim_pages",
2939 .data
= &sysctl_nr_trim_pages
,
2940 .maxlen
= sizeof(sysctl_nr_trim_pages
),
2942 .proc_handler
= proc_dointvec_minmax
,
2943 .extra1
= SYSCTL_ZERO
,
2947 .procname
= "laptop_mode",
2948 .data
= &laptop_mode
,
2949 .maxlen
= sizeof(laptop_mode
),
2951 .proc_handler
= proc_dointvec_jiffies
,
2954 .procname
= "block_dump",
2955 .data
= &block_dump
,
2956 .maxlen
= sizeof(block_dump
),
2958 .proc_handler
= proc_dointvec_minmax
,
2959 .extra1
= SYSCTL_ZERO
,
2962 .procname
= "vfs_cache_pressure",
2963 .data
= &sysctl_vfs_cache_pressure
,
2964 .maxlen
= sizeof(sysctl_vfs_cache_pressure
),
2966 .proc_handler
= proc_dointvec_minmax
,
2967 .extra1
= SYSCTL_ZERO
,
2969 #if defined(HAVE_ARCH_PICK_MMAP_LAYOUT) || \
2970 defined(CONFIG_ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT)
2972 .procname
= "legacy_va_layout",
2973 .data
= &sysctl_legacy_va_layout
,
2974 .maxlen
= sizeof(sysctl_legacy_va_layout
),
2976 .proc_handler
= proc_dointvec_minmax
,
2977 .extra1
= SYSCTL_ZERO
,
2982 .procname
= "zone_reclaim_mode",
2983 .data
= &node_reclaim_mode
,
2984 .maxlen
= sizeof(node_reclaim_mode
),
2986 .proc_handler
= proc_dointvec_minmax
,
2987 .extra1
= SYSCTL_ZERO
,
2990 .procname
= "min_unmapped_ratio",
2991 .data
= &sysctl_min_unmapped_ratio
,
2992 .maxlen
= sizeof(sysctl_min_unmapped_ratio
),
2994 .proc_handler
= sysctl_min_unmapped_ratio_sysctl_handler
,
2995 .extra1
= SYSCTL_ZERO
,
2996 .extra2
= &one_hundred
,
2999 .procname
= "min_slab_ratio",
3000 .data
= &sysctl_min_slab_ratio
,
3001 .maxlen
= sizeof(sysctl_min_slab_ratio
),
3003 .proc_handler
= sysctl_min_slab_ratio_sysctl_handler
,
3004 .extra1
= SYSCTL_ZERO
,
3005 .extra2
= &one_hundred
,
3010 .procname
= "stat_interval",
3011 .data
= &sysctl_stat_interval
,
3012 .maxlen
= sizeof(sysctl_stat_interval
),
3014 .proc_handler
= proc_dointvec_jiffies
,
3017 .procname
= "stat_refresh",
3021 .proc_handler
= vmstat_refresh
,
3026 .procname
= "mmap_min_addr",
3027 .data
= &dac_mmap_min_addr
,
3028 .maxlen
= sizeof(unsigned long),
3030 .proc_handler
= mmap_min_addr_handler
,
3035 .procname
= "numa_zonelist_order",
3036 .data
= &numa_zonelist_order
,
3037 .maxlen
= NUMA_ZONELIST_ORDER_LEN
,
3039 .proc_handler
= numa_zonelist_order_handler
,
3042 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
3043 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
3045 .procname
= "vdso_enabled",
3046 #ifdef CONFIG_X86_32
3047 .data
= &vdso32_enabled
,
3048 .maxlen
= sizeof(vdso32_enabled
),
3050 .data
= &vdso_enabled
,
3051 .maxlen
= sizeof(vdso_enabled
),
3054 .proc_handler
= proc_dointvec
,
3055 .extra1
= SYSCTL_ZERO
,
3058 #ifdef CONFIG_HIGHMEM
3060 .procname
= "highmem_is_dirtyable",
3061 .data
= &vm_highmem_is_dirtyable
,
3062 .maxlen
= sizeof(vm_highmem_is_dirtyable
),
3064 .proc_handler
= proc_dointvec_minmax
,
3065 .extra1
= SYSCTL_ZERO
,
3066 .extra2
= SYSCTL_ONE
,
3069 #ifdef CONFIG_MEMORY_FAILURE
3071 .procname
= "memory_failure_early_kill",
3072 .data
= &sysctl_memory_failure_early_kill
,
3073 .maxlen
= sizeof(sysctl_memory_failure_early_kill
),
3075 .proc_handler
= proc_dointvec_minmax
,
3076 .extra1
= SYSCTL_ZERO
,
3077 .extra2
= SYSCTL_ONE
,
3080 .procname
= "memory_failure_recovery",
3081 .data
= &sysctl_memory_failure_recovery
,
3082 .maxlen
= sizeof(sysctl_memory_failure_recovery
),
3084 .proc_handler
= proc_dointvec_minmax
,
3085 .extra1
= SYSCTL_ZERO
,
3086 .extra2
= SYSCTL_ONE
,
3090 .procname
= "user_reserve_kbytes",
3091 .data
= &sysctl_user_reserve_kbytes
,
3092 .maxlen
= sizeof(sysctl_user_reserve_kbytes
),
3094 .proc_handler
= proc_doulongvec_minmax
,
3097 .procname
= "admin_reserve_kbytes",
3098 .data
= &sysctl_admin_reserve_kbytes
,
3099 .maxlen
= sizeof(sysctl_admin_reserve_kbytes
),
3101 .proc_handler
= proc_doulongvec_minmax
,
3103 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS
3105 .procname
= "mmap_rnd_bits",
3106 .data
= &mmap_rnd_bits
,
3107 .maxlen
= sizeof(mmap_rnd_bits
),
3109 .proc_handler
= proc_dointvec_minmax
,
3110 .extra1
= (void *)&mmap_rnd_bits_min
,
3111 .extra2
= (void *)&mmap_rnd_bits_max
,
3114 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS
3116 .procname
= "mmap_rnd_compat_bits",
3117 .data
= &mmap_rnd_compat_bits
,
3118 .maxlen
= sizeof(mmap_rnd_compat_bits
),
3120 .proc_handler
= proc_dointvec_minmax
,
3121 .extra1
= (void *)&mmap_rnd_compat_bits_min
,
3122 .extra2
= (void *)&mmap_rnd_compat_bits_max
,
3125 #ifdef CONFIG_USERFAULTFD
3127 .procname
= "unprivileged_userfaultfd",
3128 .data
= &sysctl_unprivileged_userfaultfd
,
3129 .maxlen
= sizeof(sysctl_unprivileged_userfaultfd
),
3131 .proc_handler
= proc_dointvec_minmax
,
3132 .extra1
= SYSCTL_ZERO
,
3133 .extra2
= SYSCTL_ONE
,
3139 static struct ctl_table fs_table
[] = {
3141 .procname
= "inode-nr",
3142 .data
= &inodes_stat
,
3143 .maxlen
= 2*sizeof(long),
3145 .proc_handler
= proc_nr_inodes
,
3148 .procname
= "inode-state",
3149 .data
= &inodes_stat
,
3150 .maxlen
= 7*sizeof(long),
3152 .proc_handler
= proc_nr_inodes
,
3155 .procname
= "file-nr",
3156 .data
= &files_stat
,
3157 .maxlen
= sizeof(files_stat
),
3159 .proc_handler
= proc_nr_files
,
3162 .procname
= "file-max",
3163 .data
= &files_stat
.max_files
,
3164 .maxlen
= sizeof(files_stat
.max_files
),
3166 .proc_handler
= proc_doulongvec_minmax
,
3168 .extra2
= &long_max
,
3171 .procname
= "nr_open",
3172 .data
= &sysctl_nr_open
,
3173 .maxlen
= sizeof(unsigned int),
3175 .proc_handler
= proc_dointvec_minmax
,
3176 .extra1
= &sysctl_nr_open_min
,
3177 .extra2
= &sysctl_nr_open_max
,
3180 .procname
= "dentry-state",
3181 .data
= &dentry_stat
,
3182 .maxlen
= 6*sizeof(long),
3184 .proc_handler
= proc_nr_dentry
,
3187 .procname
= "overflowuid",
3188 .data
= &fs_overflowuid
,
3189 .maxlen
= sizeof(int),
3191 .proc_handler
= proc_dointvec_minmax
,
3192 .extra1
= &minolduid
,
3193 .extra2
= &maxolduid
,
3196 .procname
= "overflowgid",
3197 .data
= &fs_overflowgid
,
3198 .maxlen
= sizeof(int),
3200 .proc_handler
= proc_dointvec_minmax
,
3201 .extra1
= &minolduid
,
3202 .extra2
= &maxolduid
,
3204 #ifdef CONFIG_FILE_LOCKING
3206 .procname
= "leases-enable",
3207 .data
= &leases_enable
,
3208 .maxlen
= sizeof(int),
3210 .proc_handler
= proc_dointvec
,
3213 #ifdef CONFIG_DNOTIFY
3215 .procname
= "dir-notify-enable",
3216 .data
= &dir_notify_enable
,
3217 .maxlen
= sizeof(int),
3219 .proc_handler
= proc_dointvec
,
3223 #ifdef CONFIG_FILE_LOCKING
3225 .procname
= "lease-break-time",
3226 .data
= &lease_break_time
,
3227 .maxlen
= sizeof(int),
3229 .proc_handler
= proc_dointvec
,
3234 .procname
= "aio-nr",
3236 .maxlen
= sizeof(aio_nr
),
3238 .proc_handler
= proc_doulongvec_minmax
,
3241 .procname
= "aio-max-nr",
3242 .data
= &aio_max_nr
,
3243 .maxlen
= sizeof(aio_max_nr
),
3245 .proc_handler
= proc_doulongvec_minmax
,
3247 #endif /* CONFIG_AIO */
3248 #ifdef CONFIG_INOTIFY_USER
3250 .procname
= "inotify",
3252 .child
= inotify_table
,
3255 #ifdef CONFIG_FANOTIFY
3257 .procname
= "fanotify",
3259 .child
= fanotify_table
,
3264 .procname
= "epoll",
3266 .child
= epoll_table
,
3271 .procname
= "protected_symlinks",
3272 .data
= &sysctl_protected_symlinks
,
3273 .maxlen
= sizeof(int),
3275 .proc_handler
= proc_dointvec_minmax
,
3276 .extra1
= SYSCTL_ZERO
,
3277 .extra2
= SYSCTL_ONE
,
3280 .procname
= "protected_hardlinks",
3281 .data
= &sysctl_protected_hardlinks
,
3282 .maxlen
= sizeof(int),
3284 .proc_handler
= proc_dointvec_minmax
,
3285 .extra1
= SYSCTL_ZERO
,
3286 .extra2
= SYSCTL_ONE
,
3289 .procname
= "protected_fifos",
3290 .data
= &sysctl_protected_fifos
,
3291 .maxlen
= sizeof(int),
3293 .proc_handler
= proc_dointvec_minmax
,
3294 .extra1
= SYSCTL_ZERO
,
3298 .procname
= "protected_regular",
3299 .data
= &sysctl_protected_regular
,
3300 .maxlen
= sizeof(int),
3302 .proc_handler
= proc_dointvec_minmax
,
3303 .extra1
= SYSCTL_ZERO
,
3307 .procname
= "suid_dumpable",
3308 .data
= &suid_dumpable
,
3309 .maxlen
= sizeof(int),
3311 .proc_handler
= proc_dointvec_minmax_coredump
,
3312 .extra1
= SYSCTL_ZERO
,
3315 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
3317 .procname
= "binfmt_misc",
3319 .child
= sysctl_mount_point
,
3323 .procname
= "pipe-max-size",
3324 .data
= &pipe_max_size
,
3325 .maxlen
= sizeof(pipe_max_size
),
3327 .proc_handler
= proc_dopipe_max_size
,
3330 .procname
= "pipe-user-pages-hard",
3331 .data
= &pipe_user_pages_hard
,
3332 .maxlen
= sizeof(pipe_user_pages_hard
),
3334 .proc_handler
= proc_doulongvec_minmax
,
3337 .procname
= "pipe-user-pages-soft",
3338 .data
= &pipe_user_pages_soft
,
3339 .maxlen
= sizeof(pipe_user_pages_soft
),
3341 .proc_handler
= proc_doulongvec_minmax
,
3344 .procname
= "mount-max",
3345 .data
= &sysctl_mount_max
,
3346 .maxlen
= sizeof(unsigned int),
3348 .proc_handler
= proc_dointvec_minmax
,
3349 .extra1
= SYSCTL_ONE
,
3354 static struct ctl_table debug_table
[] = {
3355 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
3357 .procname
= "exception-trace",
3358 .data
= &show_unhandled_signals
,
3359 .maxlen
= sizeof(int),
3361 .proc_handler
= proc_dointvec
3364 #if defined(CONFIG_OPTPROBES)
3366 .procname
= "kprobes-optimization",
3367 .data
= &sysctl_kprobes_optimization
,
3368 .maxlen
= sizeof(int),
3370 .proc_handler
= proc_kprobes_optimization_handler
,
3371 .extra1
= SYSCTL_ZERO
,
3372 .extra2
= SYSCTL_ONE
,
3378 static struct ctl_table dev_table
[] = {
3382 static struct ctl_table sysctl_base_table
[] = {
3384 .procname
= "kernel",
3386 .child
= kern_table
,
3399 .procname
= "debug",
3401 .child
= debug_table
,
3411 int __init
sysctl_init(void)
3413 struct ctl_table_header
*hdr
;
3415 hdr
= register_sysctl_table(sysctl_base_table
);
3416 kmemleak_not_leak(hdr
);
3419 #endif /* CONFIG_SYSCTL */
3421 * No sense putting this after each symbol definition, twice,
3422 * exception granted :-)
3424 EXPORT_SYMBOL(proc_dointvec
);
3425 EXPORT_SYMBOL(proc_douintvec
);
3426 EXPORT_SYMBOL(proc_dointvec_jiffies
);
3427 EXPORT_SYMBOL(proc_dointvec_minmax
);
3428 EXPORT_SYMBOL_GPL(proc_douintvec_minmax
);
3429 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies
);
3430 EXPORT_SYMBOL(proc_dointvec_ms_jiffies
);
3431 EXPORT_SYMBOL(proc_dostring
);
3432 EXPORT_SYMBOL(proc_doulongvec_minmax
);
3433 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax
);
3434 EXPORT_SYMBOL(proc_do_large_bitmap
);