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| author |   Eric W. Biederman <ebiederm@xmission.com> | 2014-08-13 01:33:38 -0700 |
|---|---|---|
| committer | Eric W. Biederman <ebiederm@xmission.com> | 2014-12-02 10:46:39 -0600 |
| commit | 3e1866410f11356a9fd869beb3e95983dc79c067 (patch) | |
| tree | 4c617a54e8239301118d7dc469a2db42acfed042 /fs/namespace.c | |
| parent | Linux 3.18-rc6 (diff) | |
| download | linux-dev-3e1866410f11356a9fd869beb3e95983dc79c067.tar.xz linux-dev-3e1866410f11356a9fd869beb3e95983dc79c067.zip | |
mnt: Implicitly add MNT_NODEV on remount when it was implicitly added by mount
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>
Diffstat (limited to 'fs/namespace.c')
| -rw-r--r-- | fs/namespace.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/fs/namespace.c b/fs/namespace.c index 5b66b2b3624d..3a1a87dc33df 100644 --- a/fs/namespace.c +++ b/fs/namespace.c @@ -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)) { |