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authorLinus Torvalds <torvalds@linux-foundation.org>2023-02-23 14:16:56 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2023-02-23 14:16:56 -0800
commitfcc77d7c8ef6478844547d50dd3d03270c86116c (patch)
tree57579e819aa9694dd85eaef3ad4e19d9c0432f67 /kernel
parentc538944d8efb14e9809b685608490b017bfc2d48 (diff)
parentf1aa2eb5ea05ccd1fd92d235346e60e90a1ed949 (diff)
Merge tag 'sysctl-6.3-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/mcgrof/linux
Pull sysctl update from Luis Chamberlain: "Just one fix which just came in. Sadly the eager beavers willing to help with the sysctl moves have slowed" * tag 'sysctl-6.3-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/mcgrof/linux: sysctl: fix proc_dobool() usability
Diffstat (limited to 'kernel')
-rw-r--r--kernel/sysctl.c43
1 files changed, 24 insertions, 19 deletions
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 137d4abe3eda..1c240d2c99bc 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -425,21 +425,6 @@ static void proc_put_char(void **buf, size_t *size, char c)
}
}
-static int do_proc_dobool_conv(bool *negp, unsigned long *lvalp,
- int *valp,
- int write, void *data)
-{
- if (write) {
- *(bool *)valp = *lvalp;
- } else {
- int val = *(bool *)valp;
-
- *lvalp = (unsigned long)val;
- *negp = false;
- }
- return 0;
-}
-
static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
int *valp,
int write, void *data)
@@ -710,16 +695,36 @@ int do_proc_douintvec(struct ctl_table *table, int write,
* @lenp: the size of the user buffer
* @ppos: file position
*
- * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
- * values from/to the user buffer, treated as an ASCII string.
+ * Reads/writes one integer value from/to the user buffer,
+ * treated as an ASCII string.
+ *
+ * table->data must point to a bool variable and table->maxlen must
+ * be sizeof(bool).
*
* Returns 0 on success.
*/
int proc_dobool(struct ctl_table *table, int write, void *buffer,
size_t *lenp, loff_t *ppos)
{
- return do_proc_dointvec(table, write, buffer, lenp, ppos,
- do_proc_dobool_conv, NULL);
+ struct ctl_table tmp;
+ bool *data = table->data;
+ int res, val;
+
+ /* Do not support arrays yet. */
+ if (table->maxlen != sizeof(bool))
+ return -EINVAL;
+
+ tmp = *table;
+ tmp.maxlen = sizeof(val);
+ tmp.data = &val;
+
+ val = READ_ONCE(*data);
+ res = proc_dointvec(&tmp, write, buffer, lenp, ppos);
+ if (res)
+ return res;
+ if (write)
+ WRITE_ONCE(*data, val);
+ return 0;
}
/**