Re: [PATCH 1/2] Initial support for Allwinner's Security ID fuses

From: Linus Walleij
Date: Thu May 23 2013 - 03:56:52 EST

On Fri, May 17, 2013 at 3:35 PM, Oliver Schinagl
<oliver+list@xxxxxxxxxxx> wrote:

> While initially these fuses are used to somewhat determin the chipID, these
> appear to be writeable by the user and thus can be used for other purpouses.
> For example storing a 128 bit root key, a unique serial number, which could
> then even be used as a MAC address.
Then follows some code to read out the keys from sysfs I guess..
> +static int __init sid_probe(struct platform_device *pdev)

It's really simple to actually make the kernel use this to seed the
entropy pool.

#include <linux/random.h>
add_device_randomness(u8 *, num);

If you know after probe that you can read out a number of bytes
of device-unique data, I think you should add those bytes to the
entropy pool like this.

Linus Walleij
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