linux-kernel - Re: [PATCH 2/6] KEYS: Reinstate EPERM for a key type name beginning with a '.'

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Message-ID: <11932.1410470812@warthog.procyon.org.uk>
Date:	Thu, 11 Sep 2014 22:26:52 +0100
From:	David Howells <dhowells@...hat.com>
To:	Mimi Zohar <zohar@...ux.vnet.ibm.com>
Cc:	dhowells@...hat.com, Dmitry Kasatkin <dmitry.kasatkin@...il.com>,
	James Morris <jmorris@...ei.org>,
	keyrings <keyrings@...ux-nfs.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-security-module <linux-security-module@...r.kernel.org>,
	Vivek Goyal <vgoyal@...hat.com>
Subject: Re: [PATCH 2/6] KEYS: Reinstate EPERM for a key type name beginning with a '.'

Mimi Zohar <zohar@...ux.vnet.ibm.com> wrote:

> The concept of dot prefixing should probably be documented either in the
> code and/or documentation.  At this point, both types and keyring names
> are reserved.

Indeed.  There is one type whose name begins with a '.' that's sort of
internal to the kernel (".request_key_auth") that I definitely don't want
userspace to try creating.

The question of whether the description of a non-keyring key is permitted to
begin with a '.' is a separate issue to this patch.  We'd have to be sure that
no one is using keys of such a form.

David
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