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ovl: copy new uid/gid into overlayfs runtime inode

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commit b81de061fa 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: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Konstantin Khlebnikov 2016-01-31 16:21:29 +03:00 committed by Greg Kroah-Hartman
parent 0b7f12be0d
commit b3600dd647
1 changed files with 2 additions and 0 deletions
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2
fs/overlayfs/inode.c
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@ -65,6 +65,8 @@ 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);