Re: [PATCH v2] x86/amd: Disable RDSEED on AMD Zen5 because of an error.

[Jason A. Donenfeld]

On Fri, Nov 07, 2025 at 03:11:51PM -0800, Thiago Macieira wrote:
> On Friday, 7 November 2025 15:07:13 Pacific Standard Time Jason A. Donenfeld 
> wrote:
> > Oh. "Entropy source draining" is not a real thing. There used to be
> > bizarre behavior related to /dev/random (not urandom), but this has been
> > gone for ages. And even the non-getrandom Linux fallback code uses
> > /dev/urandom before /dev/random. So not even on old kernels is this an
> > issue. You can keep generating random numbers forever without worrying
> > about running out of juice or irritating other processes.
> 
> Thank you. This probably seals the deal. I'll prepare a patch removing the 
> direct use of the hardware instructions in the coming days.

Cool. I've got an account on the Qt Gerrit (I think, anyway; it's been
some years), in case it's useful to CC me.

Jason