linux-kernel - Re: [PATCH 4/4] KEYS: Add keyctl function to get a security label

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Date:	Tue, 12 Feb 2008 15:51:37 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	David Howells <dhowells@...hat.com>
Cc:	torvalds@...ux-foundation.org, linux-kernel@...r.kernel.org,
	dhowells@...hat.com
Subject: Re: [PATCH 4/4] KEYS: Add keyctl function to get a security label

On Fri, 08 Feb 2008 16:04:40 +0000
David Howells <dhowells@...hat.com> wrote:

> +	key_ref = lookup_user_key(NULL, keyid, 0, 1, KEY_VIEW);
> +	if (IS_ERR(key_ref)) {
> +		if (PTR_ERR(key_ref) != -EACCES)
> +			return PTR_ERR(key_ref);
> +
> +		/* viewing a key under construction is also permitted if we
> +		 * have the authorisation token handy */
> +		instkey = key_get_instantiation_authkey(keyid);
> +		if (IS_ERR(instkey))
> +			return PTR_ERR(key_ref);
> +		key_put(instkey);

This check looks a wee bit racy?
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