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/panic.h>
31 #include <linux/printk.h>
32 #include <linux/proc_fs.h>
33 #include <linux/security.h>
34 #include <linux/ctype.h>
35 #include <linux/kmemleak.h>
37 #include <linux/init.h>
38 #include <linux/kernel.h>
39 #include <linux/kobject.h>
40 #include <linux/net.h>
41 #include <linux/sysrq.h>
42 #include <linux/highuid.h>
43 #include <linux/writeback.h>
44 #include <linux/ratelimit.h>
45 #include <linux/compaction.h>
46 #include <linux/hugetlb.h>
47 #include <linux/initrd.h>
48 #include <linux/key.h>
49 #include <linux/times.h>
50 #include <linux/limits.h>
51 #include <linux/dcache.h>
52 #include <linux/dnotify.h>
53 #include <linux/syscalls.h>
54 #include <linux/vmstat.h>
55 #include <linux/nfs_fs.h>
56 #include <linux/acpi.h>
57 #include <linux/reboot.h>
58 #include <linux/ftrace.h>
59 #include <linux/perf_event.h>
60 #include <linux/kprobes.h>
61 #include <linux/pipe_fs_i.h>
62 #include <linux/oom.h>
63 #include <linux/kmod.h>
64 #include <linux/capability.h>
65 #include <linux/binfmts.h>
66 #include <linux/sched/sysctl.h>
67 #include <linux/sched/coredump.h>
68 #include <linux/kexec.h>
69 #include <linux/bpf.h>
70 #include <linux/mount.h>
71 #include <linux/userfaultfd_k.h>
72 #include <linux/coredump.h>
73 #include <linux/latencytop.h>
74 #include <linux/pid.h>
75 #include <linux/delayacct.h>
77 #include "../lib/kstrtox.h"
79 #include <linux/uaccess.h>
80 #include <asm/processor.h>
84 #include <asm/stacktrace.h>
88 #include <asm/setup.h>
90 #ifdef CONFIG_BSD_PROCESS_ACCT
91 #include <linux/acct.h>
93 #ifdef CONFIG_RT_MUTEXES
94 #include <linux/rtmutex.h>
96 #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
97 #include <linux/lockdep.h>
99 #ifdef CONFIG_CHR_DEV_SG
102 #ifdef CONFIG_STACKLEAK_RUNTIME_DISABLE
103 #include <linux/stackleak.h>
105 #ifdef CONFIG_LOCKUP_DETECTOR
106 #include <linux/nmi.h>
109 #if defined(CONFIG_SYSCTL)
111 /* Constants used for minimum and maximum */
112 #ifdef CONFIG_LOCKUP_DETECTOR
113 static int sixty = 60;
116 static int __maybe_unused neg_one = -1;
117 static int __maybe_unused two = 2;
118 static int __maybe_unused four = 4;
119 static unsigned long zero_ul;
120 static unsigned long one_ul = 1;
121 static unsigned long long_max = LONG_MAX;
122 static int one_hundred = 100;
123 static int two_hundred = 200;
124 static int one_thousand = 1000;
126 static int ten_thousand = 10000;
128 #ifdef CONFIG_PERF_EVENTS
129 static int six_hundred_forty_kb = 640 * 1024;
132 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
133 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
135 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
136 static int maxolduid = 65535;
137 static int minolduid;
139 static int ngroups_max = NGROUPS_MAX;
140 static const int cap_last_cap = CAP_LAST_CAP;
143 * This is needed for proc_doulongvec_minmax of sysctl_hung_task_timeout_secs
144 * and hung_task_check_interval_secs
146 #ifdef CONFIG_DETECT_HUNG_TASK
147 static unsigned long hung_task_timeout_max = (LONG_MAX/HZ);
150 #ifdef CONFIG_INOTIFY_USER
151 #include <linux/inotify.h>
153 #ifdef CONFIG_FANOTIFY
154 #include <linux/fanotify.h>
157 #ifdef CONFIG_PROC_SYSCTL
160 * enum sysctl_writes_mode - supported sysctl write modes
162 * @SYSCTL_WRITES_LEGACY: each write syscall must fully contain the sysctl value
163 * to be written, and multiple writes on the same sysctl file descriptor
164 * will rewrite the sysctl value, regardless of file position. No warning
165 * is issued when the initial position is not 0.
166 * @SYSCTL_WRITES_WARN: same as above but warn when the initial file position is
168 * @SYSCTL_WRITES_STRICT: writes to numeric sysctl entries must always be at
169 * file position 0 and the value must be fully contained in the buffer
170 * sent to the write syscall. If dealing with strings respect the file
171 * position, but restrict this to the max length of the buffer, anything
172 * passed the max length will be ignored. Multiple writes will append
175 * These write modes control how current file position affects the behavior of
176 * updating sysctl values through the proc interface on each write.
178 enum sysctl_writes_mode {
179 SYSCTL_WRITES_LEGACY = -1,
180 SYSCTL_WRITES_WARN = 0,
181 SYSCTL_WRITES_STRICT = 1,
184 static enum sysctl_writes_mode sysctl_writes_strict = SYSCTL_WRITES_STRICT;
185 #endif /* CONFIG_PROC_SYSCTL */
187 #if defined(HAVE_ARCH_PICK_MMAP_LAYOUT) || \
188 defined(CONFIG_ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT)
189 int sysctl_legacy_va_layout;
192 #ifdef CONFIG_COMPACTION
193 static int min_extfrag_threshold;
194 static int max_extfrag_threshold = 1000;
197 #endif /* CONFIG_SYSCTL */
199 #if defined(CONFIG_BPF_SYSCALL) && defined(CONFIG_SYSCTL)
200 static int bpf_stats_handler(struct ctl_table *table, int write,
201 void *buffer, size_t *lenp, loff_t *ppos)
203 struct static_key *key = (struct static_key *)table->data;
204 static int saved_val;
206 struct ctl_table tmp = {
208 .maxlen = sizeof(val),
210 .extra1 = SYSCTL_ZERO,
211 .extra2 = SYSCTL_ONE,
214 if (write && !capable(CAP_SYS_ADMIN))
217 mutex_lock(&bpf_stats_enabled_mutex);
219 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
220 if (write && !ret && val != saved_val) {
222 static_key_slow_inc(key);
224 static_key_slow_dec(key);
227 mutex_unlock(&bpf_stats_enabled_mutex);
231 void __weak unpriv_ebpf_notify(int new_state)
235 static int bpf_unpriv_handler(struct ctl_table *table, int write,
236 void *buffer, size_t *lenp, loff_t *ppos)
238 int ret, unpriv_enable = *(int *)table->data;
239 bool locked_state = unpriv_enable == 1;
240 struct ctl_table tmp = *table;
242 if (write && !capable(CAP_SYS_ADMIN))
245 tmp.data = &unpriv_enable;
246 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
248 if (locked_state && unpriv_enable != 1)
250 *(int *)table->data = unpriv_enable;
253 unpriv_ebpf_notify(unpriv_enable);
257 #endif /* CONFIG_BPF_SYSCALL && CONFIG_SYSCTL */
263 #ifdef CONFIG_PROC_SYSCTL
265 static int _proc_do_string(char *data, int maxlen, int write,
266 char *buffer, size_t *lenp, loff_t *ppos)
271 if (!data || !maxlen || !*lenp) {
277 if (sysctl_writes_strict == SYSCTL_WRITES_STRICT) {
278 /* Only continue writes not past the end of buffer. */
280 if (len > maxlen - 1)
287 /* Start writing from beginning of buffer. */
293 while ((p - buffer) < *lenp && len < maxlen - 1) {
295 if (c == 0 || c == '\n')
316 memcpy(buffer, data, len);
327 static void warn_sysctl_write(struct ctl_table *table)
329 pr_warn_once("%s wrote to %s when file position was not 0!\n"
330 "This will not be supported in the future. To silence this\n"
331 "warning, set kernel.sysctl_writes_strict = -1\n",
332 current->comm, table->procname);
336 * proc_first_pos_non_zero_ignore - check if first position is allowed
337 * @ppos: file position
338 * @table: the sysctl table
340 * Returns true if the first position is non-zero and the sysctl_writes_strict
341 * mode indicates this is not allowed for numeric input types. String proc
342 * handlers can ignore the return value.
344 static bool proc_first_pos_non_zero_ignore(loff_t *ppos,
345 struct ctl_table *table)
350 switch (sysctl_writes_strict) {
351 case SYSCTL_WRITES_STRICT:
353 case SYSCTL_WRITES_WARN:
354 warn_sysctl_write(table);
362 * proc_dostring - read a string sysctl
363 * @table: the sysctl table
364 * @write: %TRUE if this is a write to the sysctl file
365 * @buffer: the user buffer
366 * @lenp: the size of the user buffer
367 * @ppos: file position
369 * Reads/writes a string from/to the user buffer. If the kernel
370 * buffer provided is not large enough to hold the string, the
371 * string is truncated. The copied string is %NULL-terminated.
372 * If the string is being read by the user process, it is copied
373 * and a newline '\n' is added. It is truncated if the buffer is
376 * Returns 0 on success.
378 int proc_dostring(struct ctl_table *table, int write,
379 void *buffer, size_t *lenp, loff_t *ppos)
382 proc_first_pos_non_zero_ignore(ppos, table);
384 return _proc_do_string(table->data, table->maxlen, write, buffer, lenp,
388 static size_t proc_skip_spaces(char **buf)
391 char *tmp = skip_spaces(*buf);
397 static void proc_skip_char(char **buf, size_t *size, const char v)
408 * strtoul_lenient - parse an ASCII formatted integer from a buffer and only
411 * @cp: kernel buffer containing the string to parse
412 * @endp: pointer to store the trailing characters
413 * @base: the base to use
414 * @res: where the parsed integer will be stored
416 * In case of success 0 is returned and @res will contain the parsed integer,
417 * @endp will hold any trailing characters.
418 * This function will fail the parse on overflow. If there wasn't an overflow
419 * the function will defer the decision what characters count as invalid to the
422 static int strtoul_lenient(const char *cp, char **endp, unsigned int base,
425 unsigned long long result;
428 cp = _parse_integer_fixup_radix(cp, &base);
429 rv = _parse_integer(cp, base, &result);
430 if ((rv & KSTRTOX_OVERFLOW) || (result != (unsigned long)result))
438 *res = (unsigned long)result;
444 * proc_get_long - reads an ASCII formatted integer from a user buffer
446 * @buf: a kernel buffer
447 * @size: size of the kernel buffer
448 * @val: this is where the number will be stored
449 * @neg: set to %TRUE if number is negative
450 * @perm_tr: a vector which contains the allowed trailers
451 * @perm_tr_len: size of the perm_tr vector
452 * @tr: pointer to store the trailer character
454 * In case of success %0 is returned and @buf and @size are updated with
455 * the amount of bytes read. If @tr is non-NULL and a trailing
456 * character exists (size is non-zero after returning from this
457 * function), @tr is updated with the trailing character.
459 static int proc_get_long(char **buf, size_t *size,
460 unsigned long *val, bool *neg,
461 const char *perm_tr, unsigned perm_tr_len, char *tr)
464 char *p, tmp[TMPBUFLEN];
470 if (len > TMPBUFLEN - 1)
473 memcpy(tmp, *buf, len);
477 if (*p == '-' && *size > 1) {
485 if (strtoul_lenient(p, &p, 0, val))
490 /* We don't know if the next char is whitespace thus we may accept
491 * invalid integers (e.g. 1234...a) or two integers instead of one
492 * (e.g. 123...1). So lets not allow such large numbers. */
493 if (len == TMPBUFLEN - 1)
496 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
499 if (tr && (len < *size))
509 * proc_put_long - converts an integer to a decimal ASCII formatted string
511 * @buf: the user buffer
512 * @size: the size of the user buffer
513 * @val: the integer to be converted
514 * @neg: sign of the number, %TRUE for negative
516 * In case of success @buf and @size are updated with the amount of bytes
519 static void proc_put_long(void **buf, size_t *size, unsigned long val, bool neg)
522 char tmp[TMPBUFLEN], *p = tmp;
524 sprintf(p, "%s%lu", neg ? "-" : "", val);
528 memcpy(*buf, tmp, len);
534 static void proc_put_char(void **buf, size_t *size, char c)
537 char **buffer = (char **)buf;
546 static int do_proc_dobool_conv(bool *negp, unsigned long *lvalp,
548 int write, void *data)
551 *(bool *)valp = *lvalp;
553 int val = *(bool *)valp;
555 *lvalp = (unsigned long)val;
561 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
563 int write, void *data)
567 if (*lvalp > (unsigned long) INT_MAX + 1)
569 WRITE_ONCE(*valp, -*lvalp);
571 if (*lvalp > (unsigned long) INT_MAX)
573 WRITE_ONCE(*valp, *lvalp);
576 int val = READ_ONCE(*valp);
579 *lvalp = -(unsigned long)val;
582 *lvalp = (unsigned long)val;
588 static int do_proc_douintvec_conv(unsigned long *lvalp,
590 int write, void *data)
593 if (*lvalp > UINT_MAX)
595 WRITE_ONCE(*valp, *lvalp);
597 unsigned int val = READ_ONCE(*valp);
598 *lvalp = (unsigned long)val;
603 static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
605 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
606 int write, void *buffer,
607 size_t *lenp, loff_t *ppos,
608 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
609 int write, void *data),
612 int *i, vleft, first = 1, err = 0;
616 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
621 i = (int *) tbl_data;
622 vleft = table->maxlen / sizeof(*i);
626 conv = do_proc_dointvec_conv;
629 if (proc_first_pos_non_zero_ignore(ppos, table))
632 if (left > PAGE_SIZE - 1)
633 left = PAGE_SIZE - 1;
637 for (; left && vleft--; i++, first=0) {
642 left -= proc_skip_spaces(&p);
646 err = proc_get_long(&p, &left, &lval, &neg,
648 sizeof(proc_wspace_sep), NULL);
651 if (conv(&neg, &lval, i, 1, data)) {
656 if (conv(&neg, &lval, i, 0, data)) {
661 proc_put_char(&buffer, &left, '\t');
662 proc_put_long(&buffer, &left, lval, neg);
666 if (!write && !first && left && !err)
667 proc_put_char(&buffer, &left, '\n');
668 if (write && !err && left)
669 left -= proc_skip_spaces(&p);
671 return err ? : -EINVAL;
678 static int do_proc_dointvec(struct ctl_table *table, int write,
679 void *buffer, size_t *lenp, loff_t *ppos,
680 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
681 int write, void *data),
684 return __do_proc_dointvec(table->data, table, write,
685 buffer, lenp, ppos, conv, data);
688 static int do_proc_douintvec_w(unsigned int *tbl_data,
689 struct ctl_table *table,
691 size_t *lenp, loff_t *ppos,
692 int (*conv)(unsigned long *lvalp,
694 int write, void *data),
705 if (proc_first_pos_non_zero_ignore(ppos, table))
708 if (left > PAGE_SIZE - 1)
709 left = PAGE_SIZE - 1;
711 left -= proc_skip_spaces(&p);
717 err = proc_get_long(&p, &left, &lval, &neg,
719 sizeof(proc_wspace_sep), NULL);
725 if (conv(&lval, tbl_data, 1, data)) {
731 left -= proc_skip_spaces(&p);
739 /* This is in keeping with old __do_proc_dointvec() */
745 static int do_proc_douintvec_r(unsigned int *tbl_data, void *buffer,
746 size_t *lenp, loff_t *ppos,
747 int (*conv)(unsigned long *lvalp,
749 int write, void *data),
758 if (conv(&lval, tbl_data, 0, data)) {
763 proc_put_long(&buffer, &left, lval, false);
767 proc_put_char(&buffer, &left, '\n');
776 static int __do_proc_douintvec(void *tbl_data, struct ctl_table *table,
777 int write, void *buffer,
778 size_t *lenp, loff_t *ppos,
779 int (*conv)(unsigned long *lvalp,
781 int write, void *data),
784 unsigned int *i, vleft;
786 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
791 i = (unsigned int *) tbl_data;
792 vleft = table->maxlen / sizeof(*i);
795 * Arrays are not supported, keep this simple. *Do not* add
804 conv = do_proc_douintvec_conv;
807 return do_proc_douintvec_w(i, table, buffer, lenp, ppos,
809 return do_proc_douintvec_r(i, buffer, lenp, ppos, conv, data);
812 static int do_proc_douintvec(struct ctl_table *table, int write,
813 void *buffer, size_t *lenp, loff_t *ppos,
814 int (*conv)(unsigned long *lvalp,
816 int write, void *data),
819 return __do_proc_douintvec(table->data, table, write,
820 buffer, lenp, ppos, conv, data);
824 * proc_dobool - read/write a bool
825 * @table: the sysctl table
826 * @write: %TRUE if this is a write to the sysctl file
827 * @buffer: the user buffer
828 * @lenp: the size of the user buffer
829 * @ppos: file position
831 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
832 * values from/to the user buffer, treated as an ASCII string.
834 * Returns 0 on success.
836 int proc_dobool(struct ctl_table *table, int write, void *buffer,
837 size_t *lenp, loff_t *ppos)
839 return do_proc_dointvec(table, write, buffer, lenp, ppos,
840 do_proc_dobool_conv, NULL);
844 * proc_dointvec - read a vector of integers
845 * @table: the sysctl table
846 * @write: %TRUE if this is a write to the sysctl file
847 * @buffer: the user buffer
848 * @lenp: the size of the user buffer
849 * @ppos: file position
851 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
852 * values from/to the user buffer, treated as an ASCII string.
854 * Returns 0 on success.
856 int proc_dointvec(struct ctl_table *table, int write, void *buffer,
857 size_t *lenp, loff_t *ppos)
859 return do_proc_dointvec(table, write, buffer, lenp, ppos, NULL, NULL);
862 #ifdef CONFIG_COMPACTION
863 static int proc_dointvec_minmax_warn_RT_change(struct ctl_table *table,
864 int write, void *buffer, size_t *lenp, loff_t *ppos)
868 if (!IS_ENABLED(CONFIG_PREEMPT_RT) || !write)
869 return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
871 old = *(int *)table->data;
872 ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
875 if (old != *(int *)table->data)
876 pr_warn_once("sysctl attribute %s changed by %s[%d]\n",
877 table->procname, current->comm,
878 task_pid_nr(current));
884 * proc_douintvec - read a vector of unsigned integers
885 * @table: the sysctl table
886 * @write: %TRUE if this is a write to the sysctl file
887 * @buffer: the user buffer
888 * @lenp: the size of the user buffer
889 * @ppos: file position
891 * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
892 * values from/to the user buffer, treated as an ASCII string.
894 * Returns 0 on success.
896 int proc_douintvec(struct ctl_table *table, int write, void *buffer,
897 size_t *lenp, loff_t *ppos)
899 return do_proc_douintvec(table, write, buffer, lenp, ppos,
900 do_proc_douintvec_conv, NULL);
904 * Taint values can only be increased
905 * This means we can safely use a temporary.
907 static int proc_taint(struct ctl_table *table, int write,
908 void *buffer, size_t *lenp, loff_t *ppos)
911 unsigned long tmptaint = get_taint();
914 if (write && !capable(CAP_SYS_ADMIN))
919 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
927 * If we are relying on panic_on_taint not producing
928 * false positives due to userspace input, bail out
929 * before setting the requested taint flags.
931 if (panic_on_taint_nousertaint && (tmptaint & panic_on_taint))
935 * Poor man's atomic or. Not worth adding a primitive
936 * to everyone's atomic.h for this
938 for (i = 0; i < TAINT_FLAGS_COUNT; i++)
939 if ((1UL << i) & tmptaint)
940 add_taint(i, LOCKDEP_STILL_OK);
947 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
948 void *buffer, size_t *lenp, loff_t *ppos)
950 if (write && !capable(CAP_SYS_ADMIN))
953 return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
958 * struct do_proc_dointvec_minmax_conv_param - proc_dointvec_minmax() range checking structure
959 * @min: pointer to minimum allowable value
960 * @max: pointer to maximum allowable value
962 * The do_proc_dointvec_minmax_conv_param structure provides the
963 * minimum and maximum values for doing range checking for those sysctl
964 * parameters that use the proc_dointvec_minmax() handler.
966 struct do_proc_dointvec_minmax_conv_param {
971 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
973 int write, void *data)
976 struct do_proc_dointvec_minmax_conv_param *param = data;
978 * If writing, first do so via a temporary local int so we can
979 * bounds-check it before touching *valp.
981 int *ip = write ? &tmp : valp;
983 ret = do_proc_dointvec_conv(negp, lvalp, ip, write, data);
988 if ((param->min && *param->min > tmp) ||
989 (param->max && *param->max < tmp))
991 WRITE_ONCE(*valp, tmp);
998 * proc_dointvec_minmax - read a vector of integers with min/max values
999 * @table: the sysctl table
1000 * @write: %TRUE if this is a write to the sysctl file
1001 * @buffer: the user buffer
1002 * @lenp: the size of the user buffer
1003 * @ppos: file position
1005 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1006 * values from/to the user buffer, treated as an ASCII string.
1008 * This routine will ensure the values are within the range specified by
1009 * table->extra1 (min) and table->extra2 (max).
1011 * Returns 0 on success or -EINVAL on write when the range check fails.
1013 int proc_dointvec_minmax(struct ctl_table *table, int write,
1014 void *buffer, size_t *lenp, loff_t *ppos)
1016 struct do_proc_dointvec_minmax_conv_param param = {
1017 .min = (int *) table->extra1,
1018 .max = (int *) table->extra2,
1020 return do_proc_dointvec(table, write, buffer, lenp, ppos,
1021 do_proc_dointvec_minmax_conv, ¶m);
1025 * struct do_proc_douintvec_minmax_conv_param - proc_douintvec_minmax() range checking structure
1026 * @min: pointer to minimum allowable value
1027 * @max: pointer to maximum allowable value
1029 * The do_proc_douintvec_minmax_conv_param structure provides the
1030 * minimum and maximum values for doing range checking for those sysctl
1031 * parameters that use the proc_douintvec_minmax() handler.
1033 struct do_proc_douintvec_minmax_conv_param {
1038 static int do_proc_douintvec_minmax_conv(unsigned long *lvalp,
1040 int write, void *data)
1044 struct do_proc_douintvec_minmax_conv_param *param = data;
1045 /* write via temporary local uint for bounds-checking */
1046 unsigned int *up = write ? &tmp : valp;
1048 ret = do_proc_douintvec_conv(lvalp, up, write, data);
1053 if ((param->min && *param->min > tmp) ||
1054 (param->max && *param->max < tmp))
1057 WRITE_ONCE(*valp, tmp);
1064 * proc_douintvec_minmax - read a vector of unsigned ints with min/max values
1065 * @table: the sysctl table
1066 * @write: %TRUE if this is a write to the sysctl file
1067 * @buffer: the user buffer
1068 * @lenp: the size of the user buffer
1069 * @ppos: file position
1071 * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
1072 * values from/to the user buffer, treated as an ASCII string. Negative
1073 * strings are not allowed.
1075 * This routine will ensure the values are within the range specified by
1076 * table->extra1 (min) and table->extra2 (max). There is a final sanity
1077 * check for UINT_MAX to avoid having to support wrap around uses from
1080 * Returns 0 on success or -ERANGE on write when the range check fails.
1082 int proc_douintvec_minmax(struct ctl_table *table, int write,
1083 void *buffer, size_t *lenp, loff_t *ppos)
1085 struct do_proc_douintvec_minmax_conv_param param = {
1086 .min = (unsigned int *) table->extra1,
1087 .max = (unsigned int *) table->extra2,
1089 return do_proc_douintvec(table, write, buffer, lenp, ppos,
1090 do_proc_douintvec_minmax_conv, ¶m);
1094 * proc_dou8vec_minmax - read a vector of unsigned chars with min/max values
1095 * @table: the sysctl table
1096 * @write: %TRUE if this is a write to the sysctl file
1097 * @buffer: the user buffer
1098 * @lenp: the size of the user buffer
1099 * @ppos: file position
1101 * Reads/writes up to table->maxlen/sizeof(u8) unsigned chars
1102 * values from/to the user buffer, treated as an ASCII string. Negative
1103 * strings are not allowed.
1105 * This routine will ensure the values are within the range specified by
1106 * table->extra1 (min) and table->extra2 (max).
1108 * Returns 0 on success or an error on write when the range check fails.
1110 int proc_dou8vec_minmax(struct ctl_table *table, int write,
1111 void *buffer, size_t *lenp, loff_t *ppos)
1113 struct ctl_table tmp;
1114 unsigned int min = 0, max = 255U, val;
1115 u8 *data = table->data;
1116 struct do_proc_douintvec_minmax_conv_param param = {
1122 /* Do not support arrays yet. */
1123 if (table->maxlen != sizeof(u8))
1126 if (table->extra1) {
1127 min = *(unsigned int *) table->extra1;
1131 if (table->extra2) {
1132 max = *(unsigned int *) table->extra2;
1139 tmp.maxlen = sizeof(val);
1141 val = READ_ONCE(*data);
1142 res = do_proc_douintvec(&tmp, write, buffer, lenp, ppos,
1143 do_proc_douintvec_minmax_conv, ¶m);
1147 WRITE_ONCE(*data, val);
1150 EXPORT_SYMBOL_GPL(proc_dou8vec_minmax);
1152 static int do_proc_dopipe_max_size_conv(unsigned long *lvalp,
1154 int write, void *data)
1159 val = round_pipe_size(*lvalp);
1165 unsigned int val = *valp;
1166 *lvalp = (unsigned long) val;
1172 static int proc_dopipe_max_size(struct ctl_table *table, int write,
1173 void *buffer, size_t *lenp, loff_t *ppos)
1175 return do_proc_douintvec(table, write, buffer, lenp, ppos,
1176 do_proc_dopipe_max_size_conv, NULL);
1179 static void validate_coredump_safety(void)
1181 #ifdef CONFIG_COREDUMP
1182 if (suid_dumpable == SUID_DUMP_ROOT &&
1183 core_pattern[0] != '/' && core_pattern[0] != '|') {
1185 "Unsafe core_pattern used with fs.suid_dumpable=2.\n"
1186 "Pipe handler or fully qualified core dump path required.\n"
1187 "Set kernel.core_pattern before fs.suid_dumpable.\n"
1193 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
1194 void *buffer, size_t *lenp, loff_t *ppos)
1196 int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
1198 validate_coredump_safety();
1202 #ifdef CONFIG_COREDUMP
1203 static int proc_dostring_coredump(struct ctl_table *table, int write,
1204 void *buffer, size_t *lenp, loff_t *ppos)
1206 int error = proc_dostring(table, write, buffer, lenp, ppos);
1208 validate_coredump_safety();
1213 #ifdef CONFIG_MAGIC_SYSRQ
1214 static int sysrq_sysctl_handler(struct ctl_table *table, int write,
1215 void *buffer, size_t *lenp, loff_t *ppos)
1221 ret = __do_proc_dointvec(&tmp, table, write, buffer,
1222 lenp, ppos, NULL, NULL);
1227 sysrq_toggle_support(tmp);
1233 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table,
1234 int write, void *buffer, size_t *lenp, loff_t *ppos,
1235 unsigned long convmul, unsigned long convdiv)
1237 unsigned long *i, *min, *max;
1238 int vleft, first = 1, err = 0;
1242 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
1247 i = (unsigned long *) data;
1248 min = (unsigned long *) table->extra1;
1249 max = (unsigned long *) table->extra2;
1250 vleft = table->maxlen / sizeof(unsigned long);
1254 if (proc_first_pos_non_zero_ignore(ppos, table))
1257 if (left > PAGE_SIZE - 1)
1258 left = PAGE_SIZE - 1;
1262 for (; left && vleft--; i++, first = 0) {
1268 left -= proc_skip_spaces(&p);
1272 err = proc_get_long(&p, &left, &val, &neg,
1274 sizeof(proc_wspace_sep), NULL);
1279 val = convmul * val / convdiv;
1280 if ((min && val < *min) || (max && val > *max)) {
1284 WRITE_ONCE(*i, val);
1286 val = convdiv * READ_ONCE(*i) / convmul;
1288 proc_put_char(&buffer, &left, '\t');
1289 proc_put_long(&buffer, &left, val, false);
1293 if (!write && !first && left && !err)
1294 proc_put_char(&buffer, &left, '\n');
1296 left -= proc_skip_spaces(&p);
1298 return err ? : -EINVAL;
1305 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
1306 void *buffer, size_t *lenp, loff_t *ppos, unsigned long convmul,
1307 unsigned long convdiv)
1309 return __do_proc_doulongvec_minmax(table->data, table, write,
1310 buffer, lenp, ppos, convmul, convdiv);
1314 * proc_doulongvec_minmax - read a vector of long integers with min/max values
1315 * @table: the sysctl table
1316 * @write: %TRUE if this is a write to the sysctl file
1317 * @buffer: the user buffer
1318 * @lenp: the size of the user buffer
1319 * @ppos: file position
1321 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
1322 * values from/to the user buffer, treated as an ASCII string.
1324 * This routine will ensure the values are within the range specified by
1325 * table->extra1 (min) and table->extra2 (max).
1327 * Returns 0 on success.
1329 int proc_doulongvec_minmax(struct ctl_table *table, int write,
1330 void *buffer, size_t *lenp, loff_t *ppos)
1332 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
1336 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
1337 * @table: the sysctl table
1338 * @write: %TRUE if this is a write to the sysctl file
1339 * @buffer: the user buffer
1340 * @lenp: the size of the user buffer
1341 * @ppos: file position
1343 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
1344 * values from/to the user buffer, treated as an ASCII string. The values
1345 * are treated as milliseconds, and converted to jiffies when they are stored.
1347 * This routine will ensure the values are within the range specified by
1348 * table->extra1 (min) and table->extra2 (max).
1350 * Returns 0 on success.
1352 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
1353 void *buffer, size_t *lenp, loff_t *ppos)
1355 return do_proc_doulongvec_minmax(table, write, buffer,
1356 lenp, ppos, HZ, 1000l);
1360 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
1362 int write, void *data)
1365 if (*lvalp > INT_MAX / HZ)
1368 WRITE_ONCE(*valp, -*lvalp * HZ);
1370 WRITE_ONCE(*valp, *lvalp * HZ);
1372 int val = READ_ONCE(*valp);
1376 lval = -(unsigned long)val;
1379 lval = (unsigned long)val;
1386 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
1388 int write, void *data)
1391 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
1393 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
1399 lval = -(unsigned long)val;
1402 lval = (unsigned long)val;
1404 *lvalp = jiffies_to_clock_t(lval);
1409 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
1411 int write, void *data)
1414 unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
1418 WRITE_ONCE(*valp, (int)jif);
1420 int val = READ_ONCE(*valp);
1424 lval = -(unsigned long)val;
1427 lval = (unsigned long)val;
1429 *lvalp = jiffies_to_msecs(lval);
1435 * proc_dointvec_jiffies - read a vector of integers as seconds
1436 * @table: the sysctl table
1437 * @write: %TRUE if this is a write to the sysctl file
1438 * @buffer: the user buffer
1439 * @lenp: the size of the user buffer
1440 * @ppos: file position
1442 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1443 * values from/to the user buffer, treated as an ASCII string.
1444 * The values read are assumed to be in seconds, and are converted into
1447 * Returns 0 on success.
1449 int proc_dointvec_jiffies(struct ctl_table *table, int write,
1450 void *buffer, size_t *lenp, loff_t *ppos)
1452 return do_proc_dointvec(table,write,buffer,lenp,ppos,
1453 do_proc_dointvec_jiffies_conv,NULL);
1457 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
1458 * @table: the sysctl table
1459 * @write: %TRUE if this is a write to the sysctl file
1460 * @buffer: the user buffer
1461 * @lenp: the size of the user buffer
1462 * @ppos: pointer to the file position
1464 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1465 * values from/to the user buffer, treated as an ASCII string.
1466 * The values read are assumed to be in 1/USER_HZ seconds, and
1467 * are converted into jiffies.
1469 * Returns 0 on success.
1471 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
1472 void *buffer, size_t *lenp, loff_t *ppos)
1474 return do_proc_dointvec(table,write,buffer,lenp,ppos,
1475 do_proc_dointvec_userhz_jiffies_conv,NULL);
1479 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
1480 * @table: the sysctl table
1481 * @write: %TRUE if this is a write to the sysctl file
1482 * @buffer: the user buffer
1483 * @lenp: the size of the user buffer
1484 * @ppos: file position
1485 * @ppos: the current position in the file
1487 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1488 * values from/to the user buffer, treated as an ASCII string.
1489 * The values read are assumed to be in 1/1000 seconds, and
1490 * are converted into jiffies.
1492 * Returns 0 on success.
1494 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, void *buffer,
1495 size_t *lenp, loff_t *ppos)
1497 return do_proc_dointvec(table, write, buffer, lenp, ppos,
1498 do_proc_dointvec_ms_jiffies_conv, NULL);
1501 static int proc_do_cad_pid(struct ctl_table *table, int write, void *buffer,
1502 size_t *lenp, loff_t *ppos)
1504 struct pid *new_pid;
1508 tmp = pid_vnr(cad_pid);
1510 r = __do_proc_dointvec(&tmp, table, write, buffer,
1511 lenp, ppos, NULL, NULL);
1515 new_pid = find_get_pid(tmp);
1519 put_pid(xchg(&cad_pid, new_pid));
1524 * proc_do_large_bitmap - read/write from/to a large bitmap
1525 * @table: the sysctl table
1526 * @write: %TRUE if this is a write to the sysctl file
1527 * @buffer: the user buffer
1528 * @lenp: the size of the user buffer
1529 * @ppos: file position
1531 * The bitmap is stored at table->data and the bitmap length (in bits)
1534 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
1535 * large bitmaps may be represented in a compact manner. Writing into
1536 * the file will clear the bitmap then update it with the given input.
1538 * Returns 0 on success.
1540 int proc_do_large_bitmap(struct ctl_table *table, int write,
1541 void *buffer, size_t *lenp, loff_t *ppos)
1544 size_t left = *lenp;
1545 unsigned long bitmap_len = table->maxlen;
1546 unsigned long *bitmap = *(unsigned long **) table->data;
1547 unsigned long *tmp_bitmap = NULL;
1548 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
1550 if (!bitmap || !bitmap_len || !left || (*ppos && !write)) {
1559 if (left > PAGE_SIZE - 1) {
1560 left = PAGE_SIZE - 1;
1561 /* How much of the buffer we'll skip this pass */
1562 skipped = *lenp - left;
1565 tmp_bitmap = bitmap_zalloc(bitmap_len, GFP_KERNEL);
1568 proc_skip_char(&p, &left, '\n');
1569 while (!err && left) {
1570 unsigned long val_a, val_b;
1574 /* In case we stop parsing mid-number, we can reset */
1576 err = proc_get_long(&p, &left, &val_a, &neg, tr_a,
1579 * If we consumed the entirety of a truncated buffer or
1580 * only one char is left (may be a "-"), then stop here,
1581 * reset, & come back for more.
1583 if ((left <= 1) && skipped) {
1590 if (val_a >= bitmap_len || neg) {
1602 err = proc_get_long(&p, &left, &val_b,
1603 &neg, tr_b, sizeof(tr_b),
1606 * If we consumed all of a truncated buffer or
1607 * then stop here, reset, & come back for more.
1609 if (!left && skipped) {
1616 if (val_b >= bitmap_len || neg ||
1627 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
1628 proc_skip_char(&p, &left, '\n');
1632 unsigned long bit_a, bit_b = 0;
1636 bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
1637 if (bit_a >= bitmap_len)
1639 bit_b = find_next_zero_bit(bitmap, bitmap_len,
1643 proc_put_char(&buffer, &left, ',');
1644 proc_put_long(&buffer, &left, bit_a, false);
1645 if (bit_a != bit_b) {
1646 proc_put_char(&buffer, &left, '-');
1647 proc_put_long(&buffer, &left, bit_b, false);
1652 proc_put_char(&buffer, &left, '\n');
1658 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
1660 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
1666 bitmap_free(tmp_bitmap);
1670 #else /* CONFIG_PROC_SYSCTL */
1672 int proc_dostring(struct ctl_table *table, int write,
1673 void *buffer, size_t *lenp, loff_t *ppos)
1678 int proc_dobool(struct ctl_table *table, int write,
1679 void *buffer, size_t *lenp, loff_t *ppos)
1684 int proc_dointvec(struct ctl_table *table, int write,
1685 void *buffer, size_t *lenp, loff_t *ppos)
1690 int proc_douintvec(struct ctl_table *table, int write,
1691 void *buffer, size_t *lenp, loff_t *ppos)
1696 int proc_dointvec_minmax(struct ctl_table *table, int write,
1697 void *buffer, size_t *lenp, loff_t *ppos)
1702 int proc_douintvec_minmax(struct ctl_table *table, int write,
1703 void *buffer, size_t *lenp, loff_t *ppos)
1708 int proc_dou8vec_minmax(struct ctl_table *table, int write,
1709 void *buffer, size_t *lenp, loff_t *ppos)
1714 int proc_dointvec_jiffies(struct ctl_table *table, int write,
1715 void *buffer, size_t *lenp, loff_t *ppos)
1720 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
1721 void *buffer, size_t *lenp, loff_t *ppos)
1726 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
1727 void *buffer, size_t *lenp, loff_t *ppos)
1732 int proc_doulongvec_minmax(struct ctl_table *table, int write,
1733 void *buffer, size_t *lenp, loff_t *ppos)
1738 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
1739 void *buffer, size_t *lenp, loff_t *ppos)
1744 int proc_do_large_bitmap(struct ctl_table *table, int write,
1745 void *buffer, size_t *lenp, loff_t *ppos)
1750 #endif /* CONFIG_PROC_SYSCTL */
1752 #if defined(CONFIG_SYSCTL)
1753 int proc_do_static_key(struct ctl_table *table, int write,
1754 void *buffer, size_t *lenp, loff_t *ppos)
1756 struct static_key *key = (struct static_key *)table->data;
1757 static DEFINE_MUTEX(static_key_mutex);
1759 struct ctl_table tmp = {
1761 .maxlen = sizeof(val),
1762 .mode = table->mode,
1763 .extra1 = SYSCTL_ZERO,
1764 .extra2 = SYSCTL_ONE,
1767 if (write && !capable(CAP_SYS_ADMIN))
1770 mutex_lock(&static_key_mutex);
1771 val = static_key_enabled(key);
1772 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
1773 if (write && !ret) {
1775 static_key_enable(key);
1777 static_key_disable(key);
1779 mutex_unlock(&static_key_mutex);
1783 static struct ctl_table kern_table[] = {
1785 .procname = "sched_child_runs_first",
1786 .data = &sysctl_sched_child_runs_first,
1787 .maxlen = sizeof(unsigned int),
1789 .proc_handler = proc_dointvec,
1791 #ifdef CONFIG_SCHEDSTATS
1793 .procname = "sched_schedstats",
1795 .maxlen = sizeof(unsigned int),
1797 .proc_handler = sysctl_schedstats,
1798 .extra1 = SYSCTL_ZERO,
1799 .extra2 = SYSCTL_ONE,
1801 #endif /* CONFIG_SCHEDSTATS */
1802 #ifdef CONFIG_TASK_DELAY_ACCT
1804 .procname = "task_delayacct",
1806 .maxlen = sizeof(unsigned int),
1808 .proc_handler = sysctl_delayacct,
1809 .extra1 = SYSCTL_ZERO,
1810 .extra2 = SYSCTL_ONE,
1812 #endif /* CONFIG_TASK_DELAY_ACCT */
1813 #ifdef CONFIG_NUMA_BALANCING
1815 .procname = "numa_balancing",
1816 .data = NULL, /* filled in by handler */
1817 .maxlen = sizeof(unsigned int),
1819 .proc_handler = sysctl_numa_balancing,
1820 .extra1 = SYSCTL_ZERO,
1821 .extra2 = SYSCTL_ONE,
1823 #endif /* CONFIG_NUMA_BALANCING */
1825 .procname = "sched_rt_period_us",
1826 .data = &sysctl_sched_rt_period,
1827 .maxlen = sizeof(unsigned int),
1829 .proc_handler = sched_rt_handler,
1832 .procname = "sched_rt_runtime_us",
1833 .data = &sysctl_sched_rt_runtime,
1834 .maxlen = sizeof(int),
1836 .proc_handler = sched_rt_handler,
1839 .procname = "sched_deadline_period_max_us",
1840 .data = &sysctl_sched_dl_period_max,
1841 .maxlen = sizeof(unsigned int),
1843 .proc_handler = proc_dointvec,
1846 .procname = "sched_deadline_period_min_us",
1847 .data = &sysctl_sched_dl_period_min,
1848 .maxlen = sizeof(unsigned int),
1850 .proc_handler = proc_dointvec,
1853 .procname = "sched_rr_timeslice_ms",
1854 .data = &sysctl_sched_rr_timeslice,
1855 .maxlen = sizeof(int),
1857 .proc_handler = sched_rr_handler,
1859 #ifdef CONFIG_UCLAMP_TASK
1861 .procname = "sched_util_clamp_min",
1862 .data = &sysctl_sched_uclamp_util_min,
1863 .maxlen = sizeof(unsigned int),
1865 .proc_handler = sysctl_sched_uclamp_handler,
1868 .procname = "sched_util_clamp_max",
1869 .data = &sysctl_sched_uclamp_util_max,
1870 .maxlen = sizeof(unsigned int),
1872 .proc_handler = sysctl_sched_uclamp_handler,
1875 .procname = "sched_util_clamp_min_rt_default",
1876 .data = &sysctl_sched_uclamp_util_min_rt_default,
1877 .maxlen = sizeof(unsigned int),
1879 .proc_handler = sysctl_sched_uclamp_handler,
1882 #ifdef CONFIG_SCHED_AUTOGROUP
1884 .procname = "sched_autogroup_enabled",
1885 .data = &sysctl_sched_autogroup_enabled,
1886 .maxlen = sizeof(unsigned int),
1888 .proc_handler = proc_dointvec_minmax,
1889 .extra1 = SYSCTL_ZERO,
1890 .extra2 = SYSCTL_ONE,
1893 #ifdef CONFIG_CFS_BANDWIDTH
1895 .procname = "sched_cfs_bandwidth_slice_us",
1896 .data = &sysctl_sched_cfs_bandwidth_slice,
1897 .maxlen = sizeof(unsigned int),
1899 .proc_handler = proc_dointvec_minmax,
1900 .extra1 = SYSCTL_ONE,
1903 #if defined(CONFIG_ENERGY_MODEL) && defined(CONFIG_CPU_FREQ_GOV_SCHEDUTIL)
1905 .procname = "sched_energy_aware",
1906 .data = &sysctl_sched_energy_aware,
1907 .maxlen = sizeof(unsigned int),
1909 .proc_handler = sched_energy_aware_handler,
1910 .extra1 = SYSCTL_ZERO,
1911 .extra2 = SYSCTL_ONE,
1914 #ifdef CONFIG_PROVE_LOCKING
1916 .procname = "prove_locking",
1917 .data = &prove_locking,
1918 .maxlen = sizeof(int),
1920 .proc_handler = proc_dointvec,
1923 #ifdef CONFIG_LOCK_STAT
1925 .procname = "lock_stat",
1927 .maxlen = sizeof(int),
1929 .proc_handler = proc_dointvec,
1933 .procname = "panic",
1934 .data = &panic_timeout,
1935 .maxlen = sizeof(int),
1937 .proc_handler = proc_dointvec,
1939 #ifdef CONFIG_COREDUMP
1941 .procname = "core_uses_pid",
1942 .data = &core_uses_pid,
1943 .maxlen = sizeof(int),
1945 .proc_handler = proc_dointvec,
1948 .procname = "core_pattern",
1949 .data = core_pattern,
1950 .maxlen = CORENAME_MAX_SIZE,
1952 .proc_handler = proc_dostring_coredump,
1955 .procname = "core_pipe_limit",
1956 .data = &core_pipe_limit,
1957 .maxlen = sizeof(unsigned int),
1959 .proc_handler = proc_dointvec,
1962 #ifdef CONFIG_PROC_SYSCTL
1964 .procname = "tainted",
1965 .maxlen = sizeof(long),
1967 .proc_handler = proc_taint,
1970 .procname = "sysctl_writes_strict",
1971 .data = &sysctl_writes_strict,
1972 .maxlen = sizeof(int),
1974 .proc_handler = proc_dointvec_minmax,
1976 .extra2 = SYSCTL_ONE,
1979 #ifdef CONFIG_LATENCYTOP
1981 .procname = "latencytop",
1982 .data = &latencytop_enabled,
1983 .maxlen = sizeof(int),
1985 .proc_handler = sysctl_latencytop,
1988 #ifdef CONFIG_BLK_DEV_INITRD
1990 .procname = "real-root-dev",
1991 .data = &real_root_dev,
1992 .maxlen = sizeof(int),
1994 .proc_handler = proc_dointvec,
1998 .procname = "print-fatal-signals",
1999 .data = &print_fatal_signals,
2000 .maxlen = sizeof(int),
2002 .proc_handler = proc_dointvec,
2006 .procname = "reboot-cmd",
2007 .data = reboot_command,
2010 .proc_handler = proc_dostring,
2013 .procname = "stop-a",
2014 .data = &stop_a_enabled,
2015 .maxlen = sizeof (int),
2017 .proc_handler = proc_dointvec,
2020 .procname = "scons-poweroff",
2021 .data = &scons_pwroff,
2022 .maxlen = sizeof (int),
2024 .proc_handler = proc_dointvec,
2027 #ifdef CONFIG_SPARC64
2029 .procname = "tsb-ratio",
2030 .data = &sysctl_tsb_ratio,
2031 .maxlen = sizeof (int),
2033 .proc_handler = proc_dointvec,
2036 #ifdef CONFIG_PARISC
2038 .procname = "soft-power",
2039 .data = &pwrsw_enabled,
2040 .maxlen = sizeof (int),
2042 .proc_handler = proc_dointvec,
2045 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
2047 .procname = "unaligned-trap",
2048 .data = &unaligned_enabled,
2049 .maxlen = sizeof (int),
2051 .proc_handler = proc_dointvec,
2055 .procname = "ctrl-alt-del",
2057 .maxlen = sizeof(int),
2059 .proc_handler = proc_dointvec,
2061 #ifdef CONFIG_FUNCTION_TRACER
2063 .procname = "ftrace_enabled",
2064 .data = &ftrace_enabled,
2065 .maxlen = sizeof(int),
2067 .proc_handler = ftrace_enable_sysctl,
2070 #ifdef CONFIG_STACK_TRACER
2072 .procname = "stack_tracer_enabled",
2073 .data = &stack_tracer_enabled,
2074 .maxlen = sizeof(int),
2076 .proc_handler = stack_trace_sysctl,
2079 #ifdef CONFIG_TRACING
2081 .procname = "ftrace_dump_on_oops",
2082 .data = &ftrace_dump_on_oops,
2083 .maxlen = sizeof(int),
2085 .proc_handler = proc_dointvec,
2088 .procname = "traceoff_on_warning",
2089 .data = &__disable_trace_on_warning,
2090 .maxlen = sizeof(__disable_trace_on_warning),
2092 .proc_handler = proc_dointvec,
2095 .procname = "tracepoint_printk",
2096 .data = &tracepoint_printk,
2097 .maxlen = sizeof(tracepoint_printk),
2099 .proc_handler = tracepoint_printk_sysctl,
2102 #ifdef CONFIG_KEXEC_CORE
2104 .procname = "kexec_load_disabled",
2105 .data = &kexec_load_disabled,
2106 .maxlen = sizeof(int),
2108 /* only handle a transition from default "0" to "1" */
2109 .proc_handler = proc_dointvec_minmax,
2110 .extra1 = SYSCTL_ONE,
2111 .extra2 = SYSCTL_ONE,
2114 #ifdef CONFIG_MODULES
2116 .procname = "modprobe",
2117 .data = &modprobe_path,
2118 .maxlen = KMOD_PATH_LEN,
2120 .proc_handler = proc_dostring,
2123 .procname = "modules_disabled",
2124 .data = &modules_disabled,
2125 .maxlen = sizeof(int),
2127 /* only handle a transition from default "0" to "1" */
2128 .proc_handler = proc_dointvec_minmax,
2129 .extra1 = SYSCTL_ONE,
2130 .extra2 = SYSCTL_ONE,
2133 #ifdef CONFIG_UEVENT_HELPER
2135 .procname = "hotplug",
2136 .data = &uevent_helper,
2137 .maxlen = UEVENT_HELPER_PATH_LEN,
2139 .proc_handler = proc_dostring,
2142 #ifdef CONFIG_CHR_DEV_SG
2144 .procname = "sg-big-buff",
2145 .data = &sg_big_buff,
2146 .maxlen = sizeof (int),
2148 .proc_handler = proc_dointvec,
2151 #ifdef CONFIG_BSD_PROCESS_ACCT
2155 .maxlen = 3*sizeof(int),
2157 .proc_handler = proc_dointvec,
2160 #ifdef CONFIG_MAGIC_SYSRQ
2162 .procname = "sysrq",
2164 .maxlen = sizeof (int),
2166 .proc_handler = sysrq_sysctl_handler,
2169 #ifdef CONFIG_PROC_SYSCTL
2171 .procname = "cad_pid",
2173 .maxlen = sizeof (int),
2175 .proc_handler = proc_do_cad_pid,
2179 .procname = "threads-max",
2181 .maxlen = sizeof(int),
2183 .proc_handler = sysctl_max_threads,
2186 .procname = "random",
2188 .child = random_table,
2191 .procname = "usermodehelper",
2193 .child = usermodehelper_table,
2195 #ifdef CONFIG_FW_LOADER_USER_HELPER
2197 .procname = "firmware_config",
2199 .child = firmware_config_table,
2203 .procname = "overflowuid",
2204 .data = &overflowuid,
2205 .maxlen = sizeof(int),
2207 .proc_handler = proc_dointvec_minmax,
2208 .extra1 = &minolduid,
2209 .extra2 = &maxolduid,
2212 .procname = "overflowgid",
2213 .data = &overflowgid,
2214 .maxlen = sizeof(int),
2216 .proc_handler = proc_dointvec_minmax,
2217 .extra1 = &minolduid,
2218 .extra2 = &maxolduid,
2222 .procname = "userprocess_debug",
2223 .data = &show_unhandled_signals,
2224 .maxlen = sizeof(int),
2226 .proc_handler = proc_dointvec,
2231 .procname = "oops_all_cpu_backtrace",
2232 .data = &sysctl_oops_all_cpu_backtrace,
2233 .maxlen = sizeof(int),
2235 .proc_handler = proc_dointvec_minmax,
2236 .extra1 = SYSCTL_ZERO,
2237 .extra2 = SYSCTL_ONE,
2239 #endif /* CONFIG_SMP */
2241 .procname = "pid_max",
2243 .maxlen = sizeof (int),
2245 .proc_handler = proc_dointvec_minmax,
2246 .extra1 = &pid_max_min,
2247 .extra2 = &pid_max_max,
2250 .procname = "panic_on_oops",
2251 .data = &panic_on_oops,
2252 .maxlen = sizeof(int),
2254 .proc_handler = proc_dointvec,
2257 .procname = "panic_print",
2258 .data = &panic_print,
2259 .maxlen = sizeof(unsigned long),
2261 .proc_handler = proc_doulongvec_minmax,
2263 #if defined CONFIG_PRINTK
2265 .procname = "printk",
2266 .data = &console_loglevel,
2267 .maxlen = 4*sizeof(int),
2269 .proc_handler = proc_dointvec,
2272 .procname = "printk_ratelimit",
2273 .data = &printk_ratelimit_state.interval,
2274 .maxlen = sizeof(int),
2276 .proc_handler = proc_dointvec_jiffies,
2279 .procname = "printk_ratelimit_burst",
2280 .data = &printk_ratelimit_state.burst,
2281 .maxlen = sizeof(int),
2283 .proc_handler = proc_dointvec,
2286 .procname = "printk_delay",
2287 .data = &printk_delay_msec,
2288 .maxlen = sizeof(int),
2290 .proc_handler = proc_dointvec_minmax,
2291 .extra1 = SYSCTL_ZERO,
2292 .extra2 = &ten_thousand,
2295 .procname = "printk_devkmsg",
2296 .data = devkmsg_log_str,
2297 .maxlen = DEVKMSG_STR_MAX_SIZE,
2299 .proc_handler = devkmsg_sysctl_set_loglvl,
2302 .procname = "dmesg_restrict",
2303 .data = &dmesg_restrict,
2304 .maxlen = sizeof(int),
2306 .proc_handler = proc_dointvec_minmax_sysadmin,
2307 .extra1 = SYSCTL_ZERO,
2308 .extra2 = SYSCTL_ONE,
2311 .procname = "kptr_restrict",
2312 .data = &kptr_restrict,
2313 .maxlen = sizeof(int),
2315 .proc_handler = proc_dointvec_minmax_sysadmin,
2316 .extra1 = SYSCTL_ZERO,
2321 .procname = "ngroups_max",
2322 .data = &ngroups_max,
2323 .maxlen = sizeof (int),
2325 .proc_handler = proc_dointvec,
2328 .procname = "cap_last_cap",
2329 .data = (void *)&cap_last_cap,
2330 .maxlen = sizeof(int),
2332 .proc_handler = proc_dointvec,
2334 #if defined(CONFIG_LOCKUP_DETECTOR)
2336 .procname = "watchdog",
2337 .data = &watchdog_user_enabled,
2338 .maxlen = sizeof(int),
2340 .proc_handler = proc_watchdog,
2341 .extra1 = SYSCTL_ZERO,
2342 .extra2 = SYSCTL_ONE,
2345 .procname = "watchdog_thresh",
2346 .data = &watchdog_thresh,
2347 .maxlen = sizeof(int),
2349 .proc_handler = proc_watchdog_thresh,
2350 .extra1 = SYSCTL_ZERO,
2354 .procname = "nmi_watchdog",
2355 .data = &nmi_watchdog_user_enabled,
2356 .maxlen = sizeof(int),
2357 .mode = NMI_WATCHDOG_SYSCTL_PERM,
2358 .proc_handler = proc_nmi_watchdog,
2359 .extra1 = SYSCTL_ZERO,
2360 .extra2 = SYSCTL_ONE,
2363 .procname = "watchdog_cpumask",
2364 .data = &watchdog_cpumask_bits,
2367 .proc_handler = proc_watchdog_cpumask,
2369 #ifdef CONFIG_SOFTLOCKUP_DETECTOR
2371 .procname = "soft_watchdog",
2372 .data = &soft_watchdog_user_enabled,
2373 .maxlen = sizeof(int),
2375 .proc_handler = proc_soft_watchdog,
2376 .extra1 = SYSCTL_ZERO,
2377 .extra2 = SYSCTL_ONE,
2380 .procname = "softlockup_panic",
2381 .data = &softlockup_panic,
2382 .maxlen = sizeof(int),
2384 .proc_handler = proc_dointvec_minmax,
2385 .extra1 = SYSCTL_ZERO,
2386 .extra2 = SYSCTL_ONE,
2390 .procname = "softlockup_all_cpu_backtrace",
2391 .data = &sysctl_softlockup_all_cpu_backtrace,
2392 .maxlen = sizeof(int),
2394 .proc_handler = proc_dointvec_minmax,
2395 .extra1 = SYSCTL_ZERO,
2396 .extra2 = SYSCTL_ONE,
2398 #endif /* CONFIG_SMP */
2400 #ifdef CONFIG_HARDLOCKUP_DETECTOR
2402 .procname = "hardlockup_panic",
2403 .data = &hardlockup_panic,
2404 .maxlen = sizeof(int),
2406 .proc_handler = proc_dointvec_minmax,
2407 .extra1 = SYSCTL_ZERO,
2408 .extra2 = SYSCTL_ONE,
2412 .procname = "hardlockup_all_cpu_backtrace",
2413 .data = &sysctl_hardlockup_all_cpu_backtrace,
2414 .maxlen = sizeof(int),
2416 .proc_handler = proc_dointvec_minmax,
2417 .extra1 = SYSCTL_ZERO,
2418 .extra2 = SYSCTL_ONE,
2420 #endif /* CONFIG_SMP */
2424 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
2426 .procname = "unknown_nmi_panic",
2427 .data = &unknown_nmi_panic,
2428 .maxlen = sizeof (int),
2430 .proc_handler = proc_dointvec,
2434 #if (defined(CONFIG_X86_32) || defined(CONFIG_PARISC)) && \
2435 defined(CONFIG_DEBUG_STACKOVERFLOW)
2437 .procname = "panic_on_stackoverflow",
2438 .data = &sysctl_panic_on_stackoverflow,
2439 .maxlen = sizeof(int),
2441 .proc_handler = proc_dointvec,
2444 #if defined(CONFIG_X86)
2446 .procname = "panic_on_unrecovered_nmi",
2447 .data = &panic_on_unrecovered_nmi,
2448 .maxlen = sizeof(int),
2450 .proc_handler = proc_dointvec,
2453 .procname = "panic_on_io_nmi",
2454 .data = &panic_on_io_nmi,
2455 .maxlen = sizeof(int),
2457 .proc_handler = proc_dointvec,
2460 .procname = "bootloader_type",
2461 .data = &bootloader_type,
2462 .maxlen = sizeof (int),
2464 .proc_handler = proc_dointvec,
2467 .procname = "bootloader_version",
2468 .data = &bootloader_version,
2469 .maxlen = sizeof (int),
2471 .proc_handler = proc_dointvec,
2474 .procname = "io_delay_type",
2475 .data = &io_delay_type,
2476 .maxlen = sizeof(int),
2478 .proc_handler = proc_dointvec,
2481 #if defined(CONFIG_MMU)
2483 .procname = "randomize_va_space",
2484 .data = &randomize_va_space,
2485 .maxlen = sizeof(int),
2487 .proc_handler = proc_dointvec,
2490 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
2492 .procname = "spin_retry",
2493 .data = &spin_retry,
2494 .maxlen = sizeof (int),
2496 .proc_handler = proc_dointvec,
2499 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
2501 .procname = "acpi_video_flags",
2502 .data = &acpi_realmode_flags,
2503 .maxlen = sizeof (unsigned long),
2505 .proc_handler = proc_doulongvec_minmax,
2508 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
2510 .procname = "ignore-unaligned-usertrap",
2511 .data = &no_unaligned_warning,
2512 .maxlen = sizeof (int),
2514 .proc_handler = proc_dointvec,
2519 .procname = "unaligned-dump-stack",
2520 .data = &unaligned_dump_stack,
2521 .maxlen = sizeof (int),
2523 .proc_handler = proc_dointvec,
2526 #ifdef CONFIG_DETECT_HUNG_TASK
2529 .procname = "hung_task_all_cpu_backtrace",
2530 .data = &sysctl_hung_task_all_cpu_backtrace,
2531 .maxlen = sizeof(int),
2533 .proc_handler = proc_dointvec_minmax,
2534 .extra1 = SYSCTL_ZERO,
2535 .extra2 = SYSCTL_ONE,
2537 #endif /* CONFIG_SMP */
2539 .procname = "hung_task_panic",
2540 .data = &sysctl_hung_task_panic,
2541 .maxlen = sizeof(int),
2543 .proc_handler = proc_dointvec_minmax,
2544 .extra1 = SYSCTL_ZERO,
2545 .extra2 = SYSCTL_ONE,
2548 .procname = "hung_task_check_count",
2549 .data = &sysctl_hung_task_check_count,
2550 .maxlen = sizeof(int),
2552 .proc_handler = proc_dointvec_minmax,
2553 .extra1 = SYSCTL_ZERO,
2556 .procname = "hung_task_timeout_secs",
2557 .data = &sysctl_hung_task_timeout_secs,
2558 .maxlen = sizeof(unsigned long),
2560 .proc_handler = proc_dohung_task_timeout_secs,
2561 .extra2 = &hung_task_timeout_max,
2564 .procname = "hung_task_check_interval_secs",
2565 .data = &sysctl_hung_task_check_interval_secs,
2566 .maxlen = sizeof(unsigned long),
2568 .proc_handler = proc_dohung_task_timeout_secs,
2569 .extra2 = &hung_task_timeout_max,
2572 .procname = "hung_task_warnings",
2573 .data = &sysctl_hung_task_warnings,
2574 .maxlen = sizeof(int),
2576 .proc_handler = proc_dointvec_minmax,
2580 #ifdef CONFIG_RT_MUTEXES
2582 .procname = "max_lock_depth",
2583 .data = &max_lock_depth,
2584 .maxlen = sizeof(int),
2586 .proc_handler = proc_dointvec,
2590 .procname = "poweroff_cmd",
2591 .data = &poweroff_cmd,
2592 .maxlen = POWEROFF_CMD_PATH_LEN,
2594 .proc_handler = proc_dostring,
2600 .child = key_sysctls,
2603 #ifdef CONFIG_PERF_EVENTS
2605 * User-space scripts rely on the existence of this file
2606 * as a feature check for perf_events being enabled.
2608 * So it's an ABI, do not remove!
2611 .procname = "perf_event_paranoid",
2612 .data = &sysctl_perf_event_paranoid,
2613 .maxlen = sizeof(sysctl_perf_event_paranoid),
2615 .proc_handler = proc_dointvec,
2618 .procname = "perf_event_mlock_kb",
2619 .data = &sysctl_perf_event_mlock,
2620 .maxlen = sizeof(sysctl_perf_event_mlock),
2622 .proc_handler = proc_dointvec,
2625 .procname = "perf_event_max_sample_rate",
2626 .data = &sysctl_perf_event_sample_rate,
2627 .maxlen = sizeof(sysctl_perf_event_sample_rate),
2629 .proc_handler = perf_proc_update_handler,
2630 .extra1 = SYSCTL_ONE,
2633 .procname = "perf_cpu_time_max_percent",
2634 .data = &sysctl_perf_cpu_time_max_percent,
2635 .maxlen = sizeof(sysctl_perf_cpu_time_max_percent),
2637 .proc_handler = perf_cpu_time_max_percent_handler,
2638 .extra1 = SYSCTL_ZERO,
2639 .extra2 = &one_hundred,
2642 .procname = "perf_event_max_stack",
2643 .data = &sysctl_perf_event_max_stack,
2644 .maxlen = sizeof(sysctl_perf_event_max_stack),
2646 .proc_handler = perf_event_max_stack_handler,
2647 .extra1 = SYSCTL_ZERO,
2648 .extra2 = &six_hundred_forty_kb,
2651 .procname = "perf_event_max_contexts_per_stack",
2652 .data = &sysctl_perf_event_max_contexts_per_stack,
2653 .maxlen = sizeof(sysctl_perf_event_max_contexts_per_stack),
2655 .proc_handler = perf_event_max_stack_handler,
2656 .extra1 = SYSCTL_ZERO,
2657 .extra2 = &one_thousand,
2661 .procname = "panic_on_warn",
2662 .data = &panic_on_warn,
2663 .maxlen = sizeof(int),
2665 .proc_handler = proc_dointvec_minmax,
2666 .extra1 = SYSCTL_ZERO,
2667 .extra2 = SYSCTL_ONE,
2669 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON)
2671 .procname = "timer_migration",
2672 .data = &sysctl_timer_migration,
2673 .maxlen = sizeof(unsigned int),
2675 .proc_handler = timer_migration_handler,
2676 .extra1 = SYSCTL_ZERO,
2677 .extra2 = SYSCTL_ONE,
2680 #ifdef CONFIG_BPF_SYSCALL
2682 .procname = "unprivileged_bpf_disabled",
2683 .data = &sysctl_unprivileged_bpf_disabled,
2684 .maxlen = sizeof(sysctl_unprivileged_bpf_disabled),
2686 .proc_handler = bpf_unpriv_handler,
2687 .extra1 = SYSCTL_ZERO,
2691 .procname = "bpf_stats_enabled",
2692 .data = &bpf_stats_enabled_key.key,
2693 .maxlen = sizeof(bpf_stats_enabled_key),
2695 .proc_handler = bpf_stats_handler,
2698 #if defined(CONFIG_TREE_RCU)
2700 .procname = "panic_on_rcu_stall",
2701 .data = &sysctl_panic_on_rcu_stall,
2702 .maxlen = sizeof(sysctl_panic_on_rcu_stall),
2704 .proc_handler = proc_dointvec_minmax,
2705 .extra1 = SYSCTL_ZERO,
2706 .extra2 = SYSCTL_ONE,
2709 #if defined(CONFIG_TREE_RCU)
2711 .procname = "max_rcu_stall_to_panic",
2712 .data = &sysctl_max_rcu_stall_to_panic,
2713 .maxlen = sizeof(sysctl_max_rcu_stall_to_panic),
2715 .proc_handler = proc_dointvec_minmax,
2716 .extra1 = SYSCTL_ONE,
2717 .extra2 = SYSCTL_INT_MAX,
2720 #ifdef CONFIG_STACKLEAK_RUNTIME_DISABLE
2722 .procname = "stack_erasing",
2724 .maxlen = sizeof(int),
2726 .proc_handler = stack_erasing_sysctl,
2727 .extra1 = SYSCTL_ZERO,
2728 .extra2 = SYSCTL_ONE,
2734 static struct ctl_table vm_table[] = {
2736 .procname = "overcommit_memory",
2737 .data = &sysctl_overcommit_memory,
2738 .maxlen = sizeof(sysctl_overcommit_memory),
2740 .proc_handler = overcommit_policy_handler,
2741 .extra1 = SYSCTL_ZERO,
2745 .procname = "panic_on_oom",
2746 .data = &sysctl_panic_on_oom,
2747 .maxlen = sizeof(sysctl_panic_on_oom),
2749 .proc_handler = proc_dointvec_minmax,
2750 .extra1 = SYSCTL_ZERO,
2754 .procname = "oom_kill_allocating_task",
2755 .data = &sysctl_oom_kill_allocating_task,
2756 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
2758 .proc_handler = proc_dointvec,
2761 .procname = "oom_dump_tasks",
2762 .data = &sysctl_oom_dump_tasks,
2763 .maxlen = sizeof(sysctl_oom_dump_tasks),
2765 .proc_handler = proc_dointvec,
2768 .procname = "overcommit_ratio",
2769 .data = &sysctl_overcommit_ratio,
2770 .maxlen = sizeof(sysctl_overcommit_ratio),
2772 .proc_handler = overcommit_ratio_handler,
2775 .procname = "overcommit_kbytes",
2776 .data = &sysctl_overcommit_kbytes,
2777 .maxlen = sizeof(sysctl_overcommit_kbytes),
2779 .proc_handler = overcommit_kbytes_handler,
2782 .procname = "page-cluster",
2783 .data = &page_cluster,
2784 .maxlen = sizeof(int),
2786 .proc_handler = proc_dointvec_minmax,
2787 .extra1 = SYSCTL_ZERO,
2790 .procname = "dirty_background_ratio",
2791 .data = &dirty_background_ratio,
2792 .maxlen = sizeof(dirty_background_ratio),
2794 .proc_handler = dirty_background_ratio_handler,
2795 .extra1 = SYSCTL_ZERO,
2796 .extra2 = &one_hundred,
2799 .procname = "dirty_background_bytes",
2800 .data = &dirty_background_bytes,
2801 .maxlen = sizeof(dirty_background_bytes),
2803 .proc_handler = dirty_background_bytes_handler,
2807 .procname = "dirty_ratio",
2808 .data = &vm_dirty_ratio,
2809 .maxlen = sizeof(vm_dirty_ratio),
2811 .proc_handler = dirty_ratio_handler,
2812 .extra1 = SYSCTL_ZERO,
2813 .extra2 = &one_hundred,
2816 .procname = "dirty_bytes",
2817 .data = &vm_dirty_bytes,
2818 .maxlen = sizeof(vm_dirty_bytes),
2820 .proc_handler = dirty_bytes_handler,
2821 .extra1 = &dirty_bytes_min,
2824 .procname = "dirty_writeback_centisecs",
2825 .data = &dirty_writeback_interval,
2826 .maxlen = sizeof(dirty_writeback_interval),
2828 .proc_handler = dirty_writeback_centisecs_handler,
2831 .procname = "dirty_expire_centisecs",
2832 .data = &dirty_expire_interval,
2833 .maxlen = sizeof(dirty_expire_interval),
2835 .proc_handler = proc_dointvec_minmax,
2836 .extra1 = SYSCTL_ZERO,
2839 .procname = "dirtytime_expire_seconds",
2840 .data = &dirtytime_expire_interval,
2841 .maxlen = sizeof(dirtytime_expire_interval),
2843 .proc_handler = dirtytime_interval_handler,
2844 .extra1 = SYSCTL_ZERO,
2847 .procname = "swappiness",
2848 .data = &vm_swappiness,
2849 .maxlen = sizeof(vm_swappiness),
2851 .proc_handler = proc_dointvec_minmax,
2852 .extra1 = SYSCTL_ZERO,
2853 .extra2 = &two_hundred,
2857 .procname = "numa_stat",
2858 .data = &sysctl_vm_numa_stat,
2859 .maxlen = sizeof(int),
2861 .proc_handler = sysctl_vm_numa_stat_handler,
2862 .extra1 = SYSCTL_ZERO,
2863 .extra2 = SYSCTL_ONE,
2866 #ifdef CONFIG_HUGETLB_PAGE
2868 .procname = "nr_hugepages",
2870 .maxlen = sizeof(unsigned long),
2872 .proc_handler = hugetlb_sysctl_handler,
2876 .procname = "nr_hugepages_mempolicy",
2878 .maxlen = sizeof(unsigned long),
2880 .proc_handler = &hugetlb_mempolicy_sysctl_handler,
2884 .procname = "hugetlb_shm_group",
2885 .data = &sysctl_hugetlb_shm_group,
2886 .maxlen = sizeof(gid_t),
2888 .proc_handler = proc_dointvec,
2891 .procname = "nr_overcommit_hugepages",
2893 .maxlen = sizeof(unsigned long),
2895 .proc_handler = hugetlb_overcommit_handler,
2899 .procname = "lowmem_reserve_ratio",
2900 .data = &sysctl_lowmem_reserve_ratio,
2901 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
2903 .proc_handler = lowmem_reserve_ratio_sysctl_handler,
2906 .procname = "drop_caches",
2907 .data = &sysctl_drop_caches,
2908 .maxlen = sizeof(int),
2910 .proc_handler = drop_caches_sysctl_handler,
2911 .extra1 = SYSCTL_ONE,
2914 #ifdef CONFIG_COMPACTION
2916 .procname = "compact_memory",
2918 .maxlen = sizeof(int),
2920 .proc_handler = sysctl_compaction_handler,
2923 .procname = "compaction_proactiveness",
2924 .data = &sysctl_compaction_proactiveness,
2925 .maxlen = sizeof(sysctl_compaction_proactiveness),
2927 .proc_handler = compaction_proactiveness_sysctl_handler,
2928 .extra1 = SYSCTL_ZERO,
2929 .extra2 = &one_hundred,
2932 .procname = "extfrag_threshold",
2933 .data = &sysctl_extfrag_threshold,
2934 .maxlen = sizeof(int),
2936 .proc_handler = proc_dointvec_minmax,
2937 .extra1 = &min_extfrag_threshold,
2938 .extra2 = &max_extfrag_threshold,
2941 .procname = "compact_unevictable_allowed",
2942 .data = &sysctl_compact_unevictable_allowed,
2943 .maxlen = sizeof(int),
2945 .proc_handler = proc_dointvec_minmax_warn_RT_change,
2946 .extra1 = SYSCTL_ZERO,
2947 .extra2 = SYSCTL_ONE,
2950 #endif /* CONFIG_COMPACTION */
2952 .procname = "min_free_kbytes",
2953 .data = &min_free_kbytes,
2954 .maxlen = sizeof(min_free_kbytes),
2956 .proc_handler = min_free_kbytes_sysctl_handler,
2957 .extra1 = SYSCTL_ZERO,
2960 .procname = "watermark_boost_factor",
2961 .data = &watermark_boost_factor,
2962 .maxlen = sizeof(watermark_boost_factor),
2964 .proc_handler = proc_dointvec_minmax,
2965 .extra1 = SYSCTL_ZERO,
2968 .procname = "watermark_scale_factor",
2969 .data = &watermark_scale_factor,
2970 .maxlen = sizeof(watermark_scale_factor),
2972 .proc_handler = watermark_scale_factor_sysctl_handler,
2973 .extra1 = SYSCTL_ONE,
2974 .extra2 = &one_thousand,
2977 .procname = "percpu_pagelist_high_fraction",
2978 .data = &percpu_pagelist_high_fraction,
2979 .maxlen = sizeof(percpu_pagelist_high_fraction),
2981 .proc_handler = percpu_pagelist_high_fraction_sysctl_handler,
2982 .extra1 = SYSCTL_ZERO,
2985 .procname = "page_lock_unfairness",
2986 .data = &sysctl_page_lock_unfairness,
2987 .maxlen = sizeof(sysctl_page_lock_unfairness),
2989 .proc_handler = proc_dointvec_minmax,
2990 .extra1 = SYSCTL_ZERO,
2994 .procname = "max_map_count",
2995 .data = &sysctl_max_map_count,
2996 .maxlen = sizeof(sysctl_max_map_count),
2998 .proc_handler = proc_dointvec_minmax,
2999 .extra1 = SYSCTL_ZERO,
3003 .procname = "nr_trim_pages",
3004 .data = &sysctl_nr_trim_pages,
3005 .maxlen = sizeof(sysctl_nr_trim_pages),
3007 .proc_handler = proc_dointvec_minmax,
3008 .extra1 = SYSCTL_ZERO,
3012 .procname = "laptop_mode",
3013 .data = &laptop_mode,
3014 .maxlen = sizeof(laptop_mode),
3016 .proc_handler = proc_dointvec_jiffies,
3019 .procname = "vfs_cache_pressure",
3020 .data = &sysctl_vfs_cache_pressure,
3021 .maxlen = sizeof(sysctl_vfs_cache_pressure),
3023 .proc_handler = proc_dointvec_minmax,
3024 .extra1 = SYSCTL_ZERO,
3026 #if defined(HAVE_ARCH_PICK_MMAP_LAYOUT) || \
3027 defined(CONFIG_ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT)
3029 .procname = "legacy_va_layout",
3030 .data = &sysctl_legacy_va_layout,
3031 .maxlen = sizeof(sysctl_legacy_va_layout),
3033 .proc_handler = proc_dointvec_minmax,
3034 .extra1 = SYSCTL_ZERO,
3039 .procname = "zone_reclaim_mode",
3040 .data = &node_reclaim_mode,
3041 .maxlen = sizeof(node_reclaim_mode),
3043 .proc_handler = proc_dointvec_minmax,
3044 .extra1 = SYSCTL_ZERO,
3047 .procname = "min_unmapped_ratio",
3048 .data = &sysctl_min_unmapped_ratio,
3049 .maxlen = sizeof(sysctl_min_unmapped_ratio),
3051 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler,
3052 .extra1 = SYSCTL_ZERO,
3053 .extra2 = &one_hundred,
3056 .procname = "min_slab_ratio",
3057 .data = &sysctl_min_slab_ratio,
3058 .maxlen = sizeof(sysctl_min_slab_ratio),
3060 .proc_handler = sysctl_min_slab_ratio_sysctl_handler,
3061 .extra1 = SYSCTL_ZERO,
3062 .extra2 = &one_hundred,
3067 .procname = "stat_interval",
3068 .data = &sysctl_stat_interval,
3069 .maxlen = sizeof(sysctl_stat_interval),
3071 .proc_handler = proc_dointvec_jiffies,
3074 .procname = "stat_refresh",
3078 .proc_handler = vmstat_refresh,
3083 .procname = "mmap_min_addr",
3084 .data = &dac_mmap_min_addr,
3085 .maxlen = sizeof(unsigned long),
3087 .proc_handler = mmap_min_addr_handler,
3092 .procname = "numa_zonelist_order",
3093 .data = &numa_zonelist_order,
3094 .maxlen = NUMA_ZONELIST_ORDER_LEN,
3096 .proc_handler = numa_zonelist_order_handler,
3099 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
3100 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
3102 .procname = "vdso_enabled",
3103 #ifdef CONFIG_X86_32
3104 .data = &vdso32_enabled,
3105 .maxlen = sizeof(vdso32_enabled),
3107 .data = &vdso_enabled,
3108 .maxlen = sizeof(vdso_enabled),
3111 .proc_handler = proc_dointvec,
3112 .extra1 = SYSCTL_ZERO,
3115 #ifdef CONFIG_HIGHMEM
3117 .procname = "highmem_is_dirtyable",
3118 .data = &vm_highmem_is_dirtyable,
3119 .maxlen = sizeof(vm_highmem_is_dirtyable),
3121 .proc_handler = proc_dointvec_minmax,
3122 .extra1 = SYSCTL_ZERO,
3123 .extra2 = SYSCTL_ONE,
3126 #ifdef CONFIG_MEMORY_FAILURE
3128 .procname = "memory_failure_early_kill",
3129 .data = &sysctl_memory_failure_early_kill,
3130 .maxlen = sizeof(sysctl_memory_failure_early_kill),
3132 .proc_handler = proc_dointvec_minmax,
3133 .extra1 = SYSCTL_ZERO,
3134 .extra2 = SYSCTL_ONE,
3137 .procname = "memory_failure_recovery",
3138 .data = &sysctl_memory_failure_recovery,
3139 .maxlen = sizeof(sysctl_memory_failure_recovery),
3141 .proc_handler = proc_dointvec_minmax,
3142 .extra1 = SYSCTL_ZERO,
3143 .extra2 = SYSCTL_ONE,
3147 .procname = "user_reserve_kbytes",
3148 .data = &sysctl_user_reserve_kbytes,
3149 .maxlen = sizeof(sysctl_user_reserve_kbytes),
3151 .proc_handler = proc_doulongvec_minmax,
3154 .procname = "admin_reserve_kbytes",
3155 .data = &sysctl_admin_reserve_kbytes,
3156 .maxlen = sizeof(sysctl_admin_reserve_kbytes),
3158 .proc_handler = proc_doulongvec_minmax,
3160 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS
3162 .procname = "mmap_rnd_bits",
3163 .data = &mmap_rnd_bits,
3164 .maxlen = sizeof(mmap_rnd_bits),
3166 .proc_handler = proc_dointvec_minmax,
3167 .extra1 = (void *)&mmap_rnd_bits_min,
3168 .extra2 = (void *)&mmap_rnd_bits_max,
3171 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS
3173 .procname = "mmap_rnd_compat_bits",
3174 .data = &mmap_rnd_compat_bits,
3175 .maxlen = sizeof(mmap_rnd_compat_bits),
3177 .proc_handler = proc_dointvec_minmax,
3178 .extra1 = (void *)&mmap_rnd_compat_bits_min,
3179 .extra2 = (void *)&mmap_rnd_compat_bits_max,
3182 #ifdef CONFIG_USERFAULTFD
3184 .procname = "unprivileged_userfaultfd",
3185 .data = &sysctl_unprivileged_userfaultfd,
3186 .maxlen = sizeof(sysctl_unprivileged_userfaultfd),
3188 .proc_handler = proc_dointvec_minmax,
3189 .extra1 = SYSCTL_ZERO,
3190 .extra2 = SYSCTL_ONE,
3196 static struct ctl_table fs_table[] = {
3198 .procname = "inode-nr",
3199 .data = &inodes_stat,
3200 .maxlen = 2*sizeof(long),
3202 .proc_handler = proc_nr_inodes,
3205 .procname = "inode-state",
3206 .data = &inodes_stat,
3207 .maxlen = 7*sizeof(long),
3209 .proc_handler = proc_nr_inodes,
3212 .procname = "file-nr",
3213 .data = &files_stat,
3214 .maxlen = sizeof(files_stat),
3216 .proc_handler = proc_nr_files,
3219 .procname = "file-max",
3220 .data = &files_stat.max_files,
3221 .maxlen = sizeof(files_stat.max_files),
3223 .proc_handler = proc_doulongvec_minmax,
3225 .extra2 = &long_max,
3228 .procname = "nr_open",
3229 .data = &sysctl_nr_open,
3230 .maxlen = sizeof(unsigned int),
3232 .proc_handler = proc_dointvec_minmax,
3233 .extra1 = &sysctl_nr_open_min,
3234 .extra2 = &sysctl_nr_open_max,
3237 .procname = "dentry-state",
3238 .data = &dentry_stat,
3239 .maxlen = 6*sizeof(long),
3241 .proc_handler = proc_nr_dentry,
3244 .procname = "overflowuid",
3245 .data = &fs_overflowuid,
3246 .maxlen = sizeof(int),
3248 .proc_handler = proc_dointvec_minmax,
3249 .extra1 = &minolduid,
3250 .extra2 = &maxolduid,
3253 .procname = "overflowgid",
3254 .data = &fs_overflowgid,
3255 .maxlen = sizeof(int),
3257 .proc_handler = proc_dointvec_minmax,
3258 .extra1 = &minolduid,
3259 .extra2 = &maxolduid,
3261 #ifdef CONFIG_FILE_LOCKING
3263 .procname = "leases-enable",
3264 .data = &leases_enable,
3265 .maxlen = sizeof(int),
3267 .proc_handler = proc_dointvec,
3270 #ifdef CONFIG_DNOTIFY
3272 .procname = "dir-notify-enable",
3273 .data = &dir_notify_enable,
3274 .maxlen = sizeof(int),
3276 .proc_handler = proc_dointvec,
3280 #ifdef CONFIG_FILE_LOCKING
3282 .procname = "lease-break-time",
3283 .data = &lease_break_time,
3284 .maxlen = sizeof(int),
3286 .proc_handler = proc_dointvec,
3291 .procname = "aio-nr",
3293 .maxlen = sizeof(aio_nr),
3295 .proc_handler = proc_doulongvec_minmax,
3298 .procname = "aio-max-nr",
3299 .data = &aio_max_nr,
3300 .maxlen = sizeof(aio_max_nr),
3302 .proc_handler = proc_doulongvec_minmax,
3304 #endif /* CONFIG_AIO */
3305 #ifdef CONFIG_INOTIFY_USER
3307 .procname = "inotify",
3309 .child = inotify_table,
3312 #ifdef CONFIG_FANOTIFY
3314 .procname = "fanotify",
3316 .child = fanotify_table,
3321 .procname = "epoll",
3323 .child = epoll_table,
3328 .procname = "protected_symlinks",
3329 .data = &sysctl_protected_symlinks,
3330 .maxlen = sizeof(int),
3332 .proc_handler = proc_dointvec_minmax,
3333 .extra1 = SYSCTL_ZERO,
3334 .extra2 = SYSCTL_ONE,
3337 .procname = "protected_hardlinks",
3338 .data = &sysctl_protected_hardlinks,
3339 .maxlen = sizeof(int),
3341 .proc_handler = proc_dointvec_minmax,
3342 .extra1 = SYSCTL_ZERO,
3343 .extra2 = SYSCTL_ONE,
3346 .procname = "protected_fifos",
3347 .data = &sysctl_protected_fifos,
3348 .maxlen = sizeof(int),
3350 .proc_handler = proc_dointvec_minmax,
3351 .extra1 = SYSCTL_ZERO,
3355 .procname = "protected_regular",
3356 .data = &sysctl_protected_regular,
3357 .maxlen = sizeof(int),
3359 .proc_handler = proc_dointvec_minmax,
3360 .extra1 = SYSCTL_ZERO,
3364 .procname = "suid_dumpable",
3365 .data = &suid_dumpable,
3366 .maxlen = sizeof(int),
3368 .proc_handler = proc_dointvec_minmax_coredump,
3369 .extra1 = SYSCTL_ZERO,
3372 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
3374 .procname = "binfmt_misc",
3376 .child = sysctl_mount_point,
3380 .procname = "pipe-max-size",
3381 .data = &pipe_max_size,
3382 .maxlen = sizeof(pipe_max_size),
3384 .proc_handler = proc_dopipe_max_size,
3387 .procname = "pipe-user-pages-hard",
3388 .data = &pipe_user_pages_hard,
3389 .maxlen = sizeof(pipe_user_pages_hard),
3391 .proc_handler = proc_doulongvec_minmax,
3394 .procname = "pipe-user-pages-soft",
3395 .data = &pipe_user_pages_soft,
3396 .maxlen = sizeof(pipe_user_pages_soft),
3398 .proc_handler = proc_doulongvec_minmax,
3401 .procname = "mount-max",
3402 .data = &sysctl_mount_max,
3403 .maxlen = sizeof(unsigned int),
3405 .proc_handler = proc_dointvec_minmax,
3406 .extra1 = SYSCTL_ONE,
3411 static struct ctl_table debug_table[] = {
3412 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
3414 .procname = "exception-trace",
3415 .data = &show_unhandled_signals,
3416 .maxlen = sizeof(int),
3418 .proc_handler = proc_dointvec
3421 #if defined(CONFIG_OPTPROBES)
3423 .procname = "kprobes-optimization",
3424 .data = &sysctl_kprobes_optimization,
3425 .maxlen = sizeof(int),
3427 .proc_handler = proc_kprobes_optimization_handler,
3428 .extra1 = SYSCTL_ZERO,
3429 .extra2 = SYSCTL_ONE,
3435 static struct ctl_table dev_table[] = {
3439 static struct ctl_table sysctl_base_table[] = {
3441 .procname = "kernel",
3443 .child = kern_table,
3456 .procname = "debug",
3458 .child = debug_table,
3468 int __init sysctl_init(void)
3470 struct ctl_table_header *hdr;
3472 hdr = register_sysctl_table(sysctl_base_table);
3473 kmemleak_not_leak(hdr);
3476 #endif /* CONFIG_SYSCTL */
3478 * No sense putting this after each symbol definition, twice,
3479 * exception granted :-)
3481 EXPORT_SYMBOL(proc_dobool);
3482 EXPORT_SYMBOL(proc_dointvec);
3483 EXPORT_SYMBOL(proc_douintvec);
3484 EXPORT_SYMBOL(proc_dointvec_jiffies);
3485 EXPORT_SYMBOL(proc_dointvec_minmax);
3486 EXPORT_SYMBOL_GPL(proc_douintvec_minmax);
3487 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
3488 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
3489 EXPORT_SYMBOL(proc_dostring);
3490 EXPORT_SYMBOL(proc_doulongvec_minmax);
3491 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
3492 EXPORT_SYMBOL(proc_do_large_bitmap);