Re: [PATCH] avoid entropy starvation due to stack protection

From: OndÅej BÃlka
Date: Fri Dec 21 2012 - 15:12:37 EST

On Sat, Dec 15, 2012 at 07:30:20PM -0500, Theodore Ts'o wrote:
> What I would do instead is use an AES-based cryptographic random
> number generator. That is, at boot time, grab enough randomness to
> for an AES key, and then use that key to create a cryptographic random
> number generator by encrypting a counter with said AES key. This is a
> cryptographic primitive which has been very carefully studied, and for
> architectures where you have a hardware support for AES (including
> ARMv8, Power 7, Sparc T4, as well as x86 processors with the AES-NI
> instructions), this will be much faster and require much less memory
> and CPU resources than replicating the /dev/urandom infrastructure.
I was suggesting in another thread different approach.

Use AES-based cryptographic random number generator as replacement of
/dev/urandom. Reseeding would get done by changing both aes key and

This would with hardware support make /dev/urandom much faster than its now.
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at
Please read the FAQ at