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mnt: Carefully set CL_UNPRIVILEGED in clone_mnt 

old->mnt_expiry should be ignored unless CL_EXPIRE is set.

Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
hifive-unleashed-5.1
Eric W. Biederman 2014-10-07 17:11:46 -07:00
parent 8486a7882b
commit 381cacb12c
1 changed files with 2 additions and 1 deletions
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3
fs/namespace.c
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@ -963,7 +963,8 @@ static struct mount *clone_mnt(struct mount *old, struct dentry *root,
}
/* Don't allow unprivileged users to reveal what is under a mount */
if ((flag & CL_UNPRIVILEGED) && list_empty(&old->mnt_expire))
if ((flag & CL_UNPRIVILEGED) &&
(!(flag & CL_EXPIRE) || list_empty(&old->mnt_expire)))
mnt->mnt.mnt_flags |= MNT_LOCKED;
atomic_inc(&sb->s_active);