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 = "page_lock_unfairness",
2913 .data = &sysctl_page_lock_unfairness,
2914 .maxlen = sizeof(sysctl_page_lock_unfairness),
2916 .proc_handler = proc_dointvec_minmax,
2917 .extra1 = SYSCTL_ZERO,
2921 .procname = "max_map_count",
2922 .data = &sysctl_max_map_count,
2923 .maxlen = sizeof(sysctl_max_map_count),
2925 .proc_handler = proc_dointvec_minmax,
2926 .extra1 = SYSCTL_ZERO,
2930 .procname = "nr_trim_pages",
2931 .data = &sysctl_nr_trim_pages,
2932 .maxlen = sizeof(sysctl_nr_trim_pages),
2934 .proc_handler = proc_dointvec_minmax,
2935 .extra1 = SYSCTL_ZERO,
2939 .procname = "laptop_mode",
2940 .data = &laptop_mode,
2941 .maxlen = sizeof(laptop_mode),
2943 .proc_handler = proc_dointvec_jiffies,
2946 .procname = "block_dump",
2947 .data = &block_dump,
2948 .maxlen = sizeof(block_dump),
2950 .proc_handler = proc_dointvec_minmax,
2951 .extra1 = SYSCTL_ZERO,
2954 .procname = "vfs_cache_pressure",
2955 .data = &sysctl_vfs_cache_pressure,
2956 .maxlen = sizeof(sysctl_vfs_cache_pressure),
2958 .proc_handler = proc_dointvec_minmax,
2959 .extra1 = SYSCTL_ZERO,
2961 #if defined(HAVE_ARCH_PICK_MMAP_LAYOUT) || \
2962 defined(CONFIG_ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT)
2964 .procname = "legacy_va_layout",
2965 .data = &sysctl_legacy_va_layout,
2966 .maxlen = sizeof(sysctl_legacy_va_layout),
2968 .proc_handler = proc_dointvec_minmax,
2969 .extra1 = SYSCTL_ZERO,
2974 .procname = "zone_reclaim_mode",
2975 .data = &node_reclaim_mode,
2976 .maxlen = sizeof(node_reclaim_mode),
2978 .proc_handler = proc_dointvec_minmax,
2979 .extra1 = SYSCTL_ZERO,
2982 .procname = "min_unmapped_ratio",
2983 .data = &sysctl_min_unmapped_ratio,
2984 .maxlen = sizeof(sysctl_min_unmapped_ratio),
2986 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler,
2987 .extra1 = SYSCTL_ZERO,
2988 .extra2 = &one_hundred,
2991 .procname = "min_slab_ratio",
2992 .data = &sysctl_min_slab_ratio,
2993 .maxlen = sizeof(sysctl_min_slab_ratio),
2995 .proc_handler = sysctl_min_slab_ratio_sysctl_handler,
2996 .extra1 = SYSCTL_ZERO,
2997 .extra2 = &one_hundred,
3002 .procname = "stat_interval",
3003 .data = &sysctl_stat_interval,
3004 .maxlen = sizeof(sysctl_stat_interval),
3006 .proc_handler = proc_dointvec_jiffies,
3009 .procname = "stat_refresh",
3013 .proc_handler = vmstat_refresh,
3018 .procname = "mmap_min_addr",
3019 .data = &dac_mmap_min_addr,
3020 .maxlen = sizeof(unsigned long),
3022 .proc_handler = mmap_min_addr_handler,
3027 .procname = "numa_zonelist_order",
3028 .data = &numa_zonelist_order,
3029 .maxlen = NUMA_ZONELIST_ORDER_LEN,
3031 .proc_handler = numa_zonelist_order_handler,
3034 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
3035 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
3037 .procname = "vdso_enabled",
3038 #ifdef CONFIG_X86_32
3039 .data = &vdso32_enabled,
3040 .maxlen = sizeof(vdso32_enabled),
3042 .data = &vdso_enabled,
3043 .maxlen = sizeof(vdso_enabled),
3046 .proc_handler = proc_dointvec,
3047 .extra1 = SYSCTL_ZERO,
3050 #ifdef CONFIG_HIGHMEM
3052 .procname = "highmem_is_dirtyable",
3053 .data = &vm_highmem_is_dirtyable,
3054 .maxlen = sizeof(vm_highmem_is_dirtyable),
3056 .proc_handler = proc_dointvec_minmax,
3057 .extra1 = SYSCTL_ZERO,
3058 .extra2 = SYSCTL_ONE,
3061 #ifdef CONFIG_MEMORY_FAILURE
3063 .procname = "memory_failure_early_kill",
3064 .data = &sysctl_memory_failure_early_kill,
3065 .maxlen = sizeof(sysctl_memory_failure_early_kill),
3067 .proc_handler = proc_dointvec_minmax,
3068 .extra1 = SYSCTL_ZERO,
3069 .extra2 = SYSCTL_ONE,
3072 .procname = "memory_failure_recovery",
3073 .data = &sysctl_memory_failure_recovery,
3074 .maxlen = sizeof(sysctl_memory_failure_recovery),
3076 .proc_handler = proc_dointvec_minmax,
3077 .extra1 = SYSCTL_ZERO,
3078 .extra2 = SYSCTL_ONE,
3082 .procname = "user_reserve_kbytes",
3083 .data = &sysctl_user_reserve_kbytes,
3084 .maxlen = sizeof(sysctl_user_reserve_kbytes),
3086 .proc_handler = proc_doulongvec_minmax,
3089 .procname = "admin_reserve_kbytes",
3090 .data = &sysctl_admin_reserve_kbytes,
3091 .maxlen = sizeof(sysctl_admin_reserve_kbytes),
3093 .proc_handler = proc_doulongvec_minmax,
3095 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS
3097 .procname = "mmap_rnd_bits",
3098 .data = &mmap_rnd_bits,
3099 .maxlen = sizeof(mmap_rnd_bits),
3101 .proc_handler = proc_dointvec_minmax,
3102 .extra1 = (void *)&mmap_rnd_bits_min,
3103 .extra2 = (void *)&mmap_rnd_bits_max,
3106 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS
3108 .procname = "mmap_rnd_compat_bits",
3109 .data = &mmap_rnd_compat_bits,
3110 .maxlen = sizeof(mmap_rnd_compat_bits),
3112 .proc_handler = proc_dointvec_minmax,
3113 .extra1 = (void *)&mmap_rnd_compat_bits_min,
3114 .extra2 = (void *)&mmap_rnd_compat_bits_max,
3117 #ifdef CONFIG_USERFAULTFD
3119 .procname = "unprivileged_userfaultfd",
3120 .data = &sysctl_unprivileged_userfaultfd,
3121 .maxlen = sizeof(sysctl_unprivileged_userfaultfd),
3123 .proc_handler = proc_dointvec_minmax,
3124 .extra1 = SYSCTL_ZERO,
3125 .extra2 = SYSCTL_ONE,
3131 static struct ctl_table fs_table[] = {
3133 .procname = "inode-nr",
3134 .data = &inodes_stat,
3135 .maxlen = 2*sizeof(long),
3137 .proc_handler = proc_nr_inodes,
3140 .procname = "inode-state",
3141 .data = &inodes_stat,
3142 .maxlen = 7*sizeof(long),
3144 .proc_handler = proc_nr_inodes,
3147 .procname = "file-nr",
3148 .data = &files_stat,
3149 .maxlen = sizeof(files_stat),
3151 .proc_handler = proc_nr_files,
3154 .procname = "file-max",
3155 .data = &files_stat.max_files,
3156 .maxlen = sizeof(files_stat.max_files),
3158 .proc_handler = proc_doulongvec_minmax,
3160 .extra2 = &long_max,
3163 .procname = "nr_open",
3164 .data = &sysctl_nr_open,
3165 .maxlen = sizeof(unsigned int),
3167 .proc_handler = proc_dointvec_minmax,
3168 .extra1 = &sysctl_nr_open_min,
3169 .extra2 = &sysctl_nr_open_max,
3172 .procname = "dentry-state",
3173 .data = &dentry_stat,
3174 .maxlen = 6*sizeof(long),
3176 .proc_handler = proc_nr_dentry,
3179 .procname = "overflowuid",
3180 .data = &fs_overflowuid,
3181 .maxlen = sizeof(int),
3183 .proc_handler = proc_dointvec_minmax,
3184 .extra1 = &minolduid,
3185 .extra2 = &maxolduid,
3188 .procname = "overflowgid",
3189 .data = &fs_overflowgid,
3190 .maxlen = sizeof(int),
3192 .proc_handler = proc_dointvec_minmax,
3193 .extra1 = &minolduid,
3194 .extra2 = &maxolduid,
3196 #ifdef CONFIG_FILE_LOCKING
3198 .procname = "leases-enable",
3199 .data = &leases_enable,
3200 .maxlen = sizeof(int),
3202 .proc_handler = proc_dointvec,
3205 #ifdef CONFIG_DNOTIFY
3207 .procname = "dir-notify-enable",
3208 .data = &dir_notify_enable,
3209 .maxlen = sizeof(int),
3211 .proc_handler = proc_dointvec,
3215 #ifdef CONFIG_FILE_LOCKING
3217 .procname = "lease-break-time",
3218 .data = &lease_break_time,
3219 .maxlen = sizeof(int),
3221 .proc_handler = proc_dointvec,
3226 .procname = "aio-nr",
3228 .maxlen = sizeof(aio_nr),
3230 .proc_handler = proc_doulongvec_minmax,
3233 .procname = "aio-max-nr",
3234 .data = &aio_max_nr,
3235 .maxlen = sizeof(aio_max_nr),
3237 .proc_handler = proc_doulongvec_minmax,
3239 #endif /* CONFIG_AIO */
3240 #ifdef CONFIG_INOTIFY_USER
3242 .procname = "inotify",
3244 .child = inotify_table,
3247 #ifdef CONFIG_FANOTIFY
3249 .procname = "fanotify",
3251 .child = fanotify_table,
3256 .procname = "epoll",
3258 .child = epoll_table,
3263 .procname = "protected_symlinks",
3264 .data = &sysctl_protected_symlinks,
3265 .maxlen = sizeof(int),
3267 .proc_handler = proc_dointvec_minmax,
3268 .extra1 = SYSCTL_ZERO,
3269 .extra2 = SYSCTL_ONE,
3272 .procname = "protected_hardlinks",
3273 .data = &sysctl_protected_hardlinks,
3274 .maxlen = sizeof(int),
3276 .proc_handler = proc_dointvec_minmax,
3277 .extra1 = SYSCTL_ZERO,
3278 .extra2 = SYSCTL_ONE,
3281 .procname = "protected_fifos",
3282 .data = &sysctl_protected_fifos,
3283 .maxlen = sizeof(int),
3285 .proc_handler = proc_dointvec_minmax,
3286 .extra1 = SYSCTL_ZERO,
3290 .procname = "protected_regular",
3291 .data = &sysctl_protected_regular,
3292 .maxlen = sizeof(int),
3294 .proc_handler = proc_dointvec_minmax,
3295 .extra1 = SYSCTL_ZERO,
3299 .procname = "suid_dumpable",
3300 .data = &suid_dumpable,
3301 .maxlen = sizeof(int),
3303 .proc_handler = proc_dointvec_minmax_coredump,
3304 .extra1 = SYSCTL_ZERO,
3307 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
3309 .procname = "binfmt_misc",
3311 .child = sysctl_mount_point,
3315 .procname = "pipe-max-size",
3316 .data = &pipe_max_size,
3317 .maxlen = sizeof(pipe_max_size),
3319 .proc_handler = proc_dopipe_max_size,
3322 .procname = "pipe-user-pages-hard",
3323 .data = &pipe_user_pages_hard,
3324 .maxlen = sizeof(pipe_user_pages_hard),
3326 .proc_handler = proc_doulongvec_minmax,
3329 .procname = "pipe-user-pages-soft",
3330 .data = &pipe_user_pages_soft,
3331 .maxlen = sizeof(pipe_user_pages_soft),
3333 .proc_handler = proc_doulongvec_minmax,
3336 .procname = "mount-max",
3337 .data = &sysctl_mount_max,
3338 .maxlen = sizeof(unsigned int),
3340 .proc_handler = proc_dointvec_minmax,
3341 .extra1 = SYSCTL_ONE,
3346 static struct ctl_table debug_table[] = {
3347 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
3349 .procname = "exception-trace",
3350 .data = &show_unhandled_signals,
3351 .maxlen = sizeof(int),
3353 .proc_handler = proc_dointvec
3356 #if defined(CONFIG_OPTPROBES)
3358 .procname = "kprobes-optimization",
3359 .data = &sysctl_kprobes_optimization,
3360 .maxlen = sizeof(int),
3362 .proc_handler = proc_kprobes_optimization_handler,
3363 .extra1 = SYSCTL_ZERO,
3364 .extra2 = SYSCTL_ONE,
3370 static struct ctl_table dev_table[] = {
3374 static struct ctl_table sysctl_base_table[] = {
3376 .procname = "kernel",
3378 .child = kern_table,
3391 .procname = "debug",
3393 .child = debug_table,
3403 int __init sysctl_init(void)
3405 struct ctl_table_header *hdr;
3407 hdr = register_sysctl_table(sysctl_base_table);
3408 kmemleak_not_leak(hdr);
3411 #endif /* CONFIG_SYSCTL */
3413 * No sense putting this after each symbol definition, twice,
3414 * exception granted :-)
3416 EXPORT_SYMBOL(proc_dointvec);
3417 EXPORT_SYMBOL(proc_douintvec);
3418 EXPORT_SYMBOL(proc_dointvec_jiffies);
3419 EXPORT_SYMBOL(proc_dointvec_minmax);
3420 EXPORT_SYMBOL_GPL(proc_douintvec_minmax);
3421 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
3422 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
3423 EXPORT_SYMBOL(proc_dostring);
3424 EXPORT_SYMBOL(proc_doulongvec_minmax);
3425 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
3426 EXPORT_SYMBOL(proc_do_large_bitmap);