linux-kernel - Re: [PATCH stable-5.10,5.11,5.12] x86/boot/compressed/64: Check SEV encryption in the 32-bit boot-path

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Date:   Mon, 24 May 2021 14:50:14 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Joerg Roedel <jroedel@...e.de>
Cc:     linux-kernel@...r.kernel.org, stable-commits@...r.kernel.org
Subject: Re: [PATCH stable-5.10,5.11,5.12] x86/boot/compressed/64: Check SEV
 encryption in the 32-bit boot-path

On Tue, May 18, 2021 at 01:40:18PM +0200, Joerg Roedel wrote:
> On Tue, May 18, 2021 at 01:39:02PM +0200, Joerg Roedel wrote:
> > [ Upstream commit fef81c86262879d4b1176ef51a834c15b805ebb9 ]
> > 
> > Check whether the hypervisor reported the correct C-bit when running
> > as an SEV guest. Using a wrong C-bit position could be used to leak
> > sensitive data from the guest to the hypervisor.
> > 
> > Signed-off-by: Joerg Roedel <jroedel@...e.de>
> > Signed-off-by: Borislav Petkov <bp@...e.de>
> > Link: https://lkml.kernel.org/r/20210312123824.306-8-joro@8bytes.org
> > ---
> >  arch/x86/boot/compressed/head_64.S | 85 ++++++++++++++++++++++++++++++
> >  1 file changed, 85 insertions(+)
> 
> This is compile-tested now for 5.10, 5.11 and 5.12. With 5.12 I also did
> a boot-test using the 32-bit boot-path and verified it still works as
> expected.

Now queued up, thanks.

greg k-h