| From | Kamal Mostafa <> | Subject | [PATCH 4.2.y-ckt 67/98] ovl: copy new uid/gid into overlayfs runtime inode | Date | Tue, 15 Mar 2016 16:31:01 -0700 |
| |
4.2.8-ckt6 -stable review patch. If anyone has any objections, please let me know.
---8<------------------------------------------------------------
From: Konstantin Khlebnikov <koct9i@gmail.com>
commit b81de061fa59f17d2730aabb1b84419ef3913810 upstream.
Overlayfs must update uid/gid after chown, otherwise functions like inode_owner_or_capable() will check user against stale uid. Catched by xfstests generic/087, it chowns file and calls utimes.
Signed-off-by: Konstantin Khlebnikov <koct9i@gmail.com> Signed-off-by: Miklos Szeredi <miklos@szeredi.hu> Signed-off-by: Kamal Mostafa <kamal@canonical.com> --- fs/overlayfs/inode.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/fs/overlayfs/inode.c b/fs/overlayfs/inode.c index 34300c2..0d28234 100644 --- a/fs/overlayfs/inode.c +++ b/fs/overlayfs/inode.c @@ -68,6 +68,8 @@ int ovl_setattr(struct dentry *dentry, struct iattr *attr) mutex_lock(&upperdentry->d_inode->i_mutex); err = notify_change(upperdentry, attr, NULL); + if (!err) + ovl_copyattr(upperdentry->d_inode, dentry->d_inode); mutex_unlock(&upperdentry->d_inode->i_mutex); } ovl_drop_write(dentry); -- 2.7.0
|