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xfs: sanitize remount options

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Perform basic sanitization of remount options by
passing the option string and a dummy mount structure
through xfs_parseargs and returning the result.

Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>
This commit is contained in:
Eric Sandeen 2016-03-02 09:56:31 +11:00 committed by Dave Chinner
parent 2e74af0e11
commit a08ee40a79
1 changed files with 31 additions and 1 deletions
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32
fs/xfs/xfs_super.c
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@ -172,13 +172,17 @@ suffix_kstrtoint(const substring_t *s, unsigned int base, int *res)
*
* Note that this function leaks the various device name allocations on
* failure. The caller takes care of them.
*
* *sb is const because this is also used to test options on the remount
* path, and we don't want this to have any side effects at remount time.
* Today this function does not change *sb, but just to future-proof...
*/
STATIC int
xfs_parseargs(
struct xfs_mount *mp,
char *options)
{
struct super_block *sb = mp->m_super;
const struct super_block *sb = mp->m_super;
char *p;
substring_t args[MAX_OPT_ARGS];
int dsunit = 0;
@ -1169,6 +1173,27 @@ xfs_quiesce_attr(
xfs_log_quiesce(mp);
}
STATIC int
xfs_test_remount_options(
struct super_block *sb,
struct xfs_mount *mp,
char *options)
{
int error = 0;
struct xfs_mount *tmp_mp;
tmp_mp = kmem_zalloc(sizeof(*tmp_mp), KM_MAYFAIL);
if (!tmp_mp)
return -ENOMEM;
tmp_mp->m_super = sb;
error = xfs_parseargs(tmp_mp, options);
xfs_free_fsname(tmp_mp);
kfree(tmp_mp);
return error;
}
STATIC int
xfs_fs_remount(
struct super_block *sb,
@ -1181,6 +1206,11 @@ xfs_fs_remount(
char *p;
int error;
/* First, check for complete junk; i.e. invalid options */
error = xfs_test_remount_options(sb, mp, options);
if (error)
return error;
sync_filesystem(sb);
while ((p = strsep(&options, ",")) != NULL) {
int token;