linux-kernel - Re: [PATCH] kdump, vmcoreinfo: Export sme_me

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Message-ID: <20181027091007.GB1046@nazgul.tnic>
Date:   Sat, 27 Oct 2018 11:10:07 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Baoquan He <bhe@...hat.com>
Cc:     Petr Tesarik <ptesarik@...e.cz>, lijiang <lijiang@...hat.com>,
        linux-kernel@...r.kernel.org, x86@...nel.org,
        kexec@...ts.infradead.org, mingo@...hat.com, tglx@...utronix.de,
        dyoung@...hat.com
Subject: Re: [PATCH] kdump, vmcoreinfo: Export sme_me_mask value to vmcoreinfo

On Sat, Oct 27, 2018 at 04:13:43PM +0800, Baoquan He wrote:
> Yes, agree. So sme_me_mask itself or the encryption bit number, both is
> fine.

You need the encryption bit position and it better be properly formatted
and extracted into a vmcoreinfo-specific variable because we don't
expose arch-specific details like sme_me_mask to the outside.

>  we may use cp to copy /proc/vmcore to a file directly, then analyze
> it in another compupter. This often happen when there's something
> wrong with makedumpfile, we need debug makedumpfile with the complete
> copied file.

So for the analyze-on-another-computer scenario you absolutely must copy
anything from the first kernel decrypted because you can't decrypt it on
the other machine.

Which means, in a sensitive environment, you probably should copy and
*encrypt* the dump again with gpg or so.

-- 
Regards/Gruss,
    Boris.

ECO tip #101: Trim your mails when you reply.
--