Messages in this thread | | | Date | Thu, 23 May 2013 09:56:46 +0200 | Subject | Re: [PATCH 1/2] Initial support for Allwinner's Security ID fuses | From | Linus Walleij <> |
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On Fri, May 17, 2013 at 3:35 PM, Oliver Schinagl <oliver+list@schinagl.nl> 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.
Yours, Linus Walleij
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