linux-kernel - Re: [tip: x86/urgent] x86/CPU/AMD: Add RDSEED fix for Zen5

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Message-ID: <aQOo3LcsdU23q1i2@zx2c4.com>
Date: Thu, 30 Oct 2025 19:05:16 +0100
From: "Jason A. Donenfeld" <Jason@...c4.com>
To: linux-kernel@...r.kernel.org
Cc: linux-tip-commits@...r.kernel.org, stable@...r.kernel.org,
	Gregory Price <gourry@...rry.net>,
	"Borislav Petkov (AMD)" <bp@...en8.de>, x86@...nel.org
Subject: Re: [tip: x86/urgent] x86/CPU/AMD: Add RDSEED fix for Zen5

Hi,

On Tue, Oct 28, 2025 at 12:01:51PM -0000, tip-bot2 for Gregory Price wrote:
> x86/CPU/AMD: Add RDSEED fix for Zen5
> 
> There's an issue with RDSEED's 16-bit and 32-bit register output
> variants on Zen5 which return a random value of 0 "at a rate inconsistent
> with randomness while incorrectly signaling success (CF=1)". Search the
> web for AMD-SB-7055 for more detail.
> 
> Add a fix glue which checks microcode revisions.
> 
>   [ bp: Add microcode revisions checking, rewrite. ]
> 
> Cc: stable@...r.kernel.org
> Signed-off-by: Gregory Price <gourry@...rry.net>
> Signed-off-by: Borislav Petkov (AMD) <bp@...en8.de>
> Link: https://lore.kernel.org/r/20251018024010.4112396-1-gourry@gourry.net

I didn't see this on LKML or any mailing list before this appeared in
tip. Did I miss something?

Jason