iv/linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

mnt: Implicitly add MNT_NODEV on remount when it was implicitly added by mount

Browse Source 
Now that remount is properly enforcing the rule that you can't remove
nodev at least sandstorm.io is breaking when performing a remount.

It turns out that there is an easy intuitive solution implicitly
add nodev on remount when nodev was implicitly added on mount.

Tested-by: Cedric Bosdonnat <cbosdonnat@suse.com>
Tested-by: Richard Weinberger <richard@nod.at>
Cc: stable@vger.kernel.org
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
This commit is contained in:
Eric W. Biederman 2014-08-13 01:33:38 -07:00
parent 5d01410fe4
commit 3e1866410f
1 changed files with 7 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
fs/namespace.c
View File

@ -2098,7 +2098,13 @@ static int do_remount(struct path *path, int flags, int mnt_flags,
}
if ((mnt->mnt.mnt_flags & MNT_LOCK_NODEV) &&
!(mnt_flags & MNT_NODEV)) {
return -EPERM;
/* Was the nodev implicitly added in mount? */
if ((mnt->mnt_ns->user_ns != &init_user_ns) &&
!(sb->s_type->fs_flags & FS_USERNS_DEV_MOUNT)) {
mnt_flags |= MNT_NODEV;
} else {
return -EPERM;
}
}
if ((mnt->mnt.mnt_flags & MNT_LOCK_NOSUID) &&
!(mnt_flags & MNT_NOSUID)) {