linux-kernel - Re: [PATCH RFC 0/4] Add firmware signature file check

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Date:	Tue, 6 Nov 2012 15:30:57 +0800
From:	Ming Lei <tom.leiming@...il.com>
To:	Li Joey <jlee@...ell.com>
Cc:	Takashi Iwai <tiwai@...e.de>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>, joeyli <jlee@...e.com>,
	Jiri Kosina <jkosina@...e.cz>,
	David Howells <dhowells@...hat.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	linux-kernel@...r.kernel.org,
	linux-security-module@...r.kernel.org, linux-efi@...r.kernel.org
Subject: Re: [PATCH RFC 0/4] Add firmware signature file check

On Tue, Nov 6, 2012 at 1:36 PM, Li Joey <jlee@...ell.com> wrote:

> The udev direct write firmware through data attribute, maybe we can do the
> same signature verification in firmware_data_write? The following patch
> didn't test yet.

> @@ -655,6 +656,23 @@ static ssize_t firmware_data_write(struct file *filp,
> struct kobject *kobj,
>         }
>
>         buf->size = max_t(size_t, offset, buf->size);
> +
> +#ifdef CONFIG_FIRMWARE_SIG
> +       for (i = 0; i < ARRAY_SIZE(fw_path); i++) {
> +               snprintf(path, PATH_MAX, "%s/%s.sig", fw_path[i],
> buf->fw_id);
> +               if (verify_signature(buf, path))
> +                       success = true;
> +       }

When direct loading failed, it means that the firmware isn't
under the default search path, so the above verification
might return false always.


Thanks,
-- 
Ming Lei
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