linux-kernel - Re: [PATCH] x86/pti: don't report XenPV as vulnerable

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Message-ID: <nycvar.YFH.7.76.1806150801530.6203@cbobk.fhfr.pm>
Date:   Fri, 15 Jun 2018 08:04:51 +0200 (CEST)
From:   Jiri Kosina <jikos@...nel.org>
To:     Juergen Gross <jgross@...e.com>
cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...e.de>,
        Mike Latimer <mlatimer@...e.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86/pti: don't report XenPV as vulnerable

On Fri, 15 Jun 2018, Juergen Gross wrote:

> wrong for 64-bit, too, in case the mitigation is disabled at hypervisor 
> level.

If that is indeed possible (is it?), then the check we have in 
pti_check_boottime_disable() is wrong as well.

> So the test should be done only for CONFIG_X86_64 

Fair enough.

> and the returned string should be e.g. "Mitigation: XEN".

Well, perhaps; it'd confuse all the scripts that are checking whether 
system is fully secured or not by parsing sysfs files ... but that's 
mostly their problem.

Thanks,

-- 
Jiri Kosina
SUSE Labs