linux-kernel - Re: kexec breaks with 5.4 due to memzero

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Message-ID: <28f3d204-47a2-8b4f-f6a7-11d73c2d87c8@redhat.com>
Date:   Mon, 7 Oct 2019 10:50:27 +0200
From:   Hans de Goede <hdegoede@...hat.com>
To:     Arvind Sankar <nivedita@...m.mit.edu>, linux-kernel@...r.kernel.org
Cc:     Ingo Molnar <mingo@...nel.org>, x86@...nel.org
Subject: Re: kexec breaks with 5.4 due to memzero_explicit

Hi,

On 07-10-2019 05:09, Arvind Sankar wrote:
> Hi, arch/x86/purgatory/purgatory.ro has an undefined symbol
> memzero_explicit. This has come from commit 906a4bb97f5d ("crypto:
> sha256 - Use get/put_unaligned_be32 to get input, memzero_explicit")
> according to git bisect.

Hmm, it (obviously) does build for me and using kexec still also works
for me.

But it seems that you are right and that this should not build, weird.

Thank you for reporting this. I've attached a patch which should fix this,
I'm also sending this the regular way, so that the x86 maintainers can pick it up.

Can you please give this a try and let us know if it fixes things for you?

Regards,

Hans

View attachment "0001-x86-boot-Provide-memzero_explicit.patch" of type "text/x-patch" (1068 bytes)