linux-kernel - Re: [RFC v2 4/7] modsig: add integrity_module

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Message-ID: <CA+5PVA4i6CYNmxbHHfgEYqPHVD=_PDqurFyrZzzL5jb0rdVj8w@mail.gmail.com>
Date:	Thu, 16 Aug 2012 14:49:28 -0400
From:	Josh Boyer <jwboyer@...il.com>
To:	Dmitry Kasatkin <dmitry.kasatkin@...el.com>
Cc:	zohar@...ux.vnet.ibm.com, jmorris@...ei.org, rusty@...tcorp.com.au,
	dhowells@...hat.com, linux-security-module@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC v2 4/7] modsig: add integrity_module_check hook

On Wed, Aug 15, 2012 at 2:43 PM, Dmitry Kasatkin
<dmitry.kasatkin@...el.com> wrote:
> @@ -2437,6 +2438,14 @@ static int copy_and_check(struct load_info *info,
>
>         info->hdr = hdr;
>         info->len = len;
> +
> +       err = integrity_module_check(hdr, len);
> +       if (err < 0)
> +               goto free_hdr;
> +
> +       /* cut signature tail */
> +       info->len = err;
> +
>         return 0;
>
>  free_hdr:

So if I'm reading this correctly, any module that fails signature
verification will fail to load.  That makes sense, but I wonder if you
intend to support a non-enforcing mode for module signatures at all?
Actually, a brief document in Documentation describing how this whole
mechanism works and what the fail states are would be good.  David's
patches have it nicely spelled out and I don't see anything similar in
your patch set.

josh
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