linux-kernel - Re: KCSAN + KVM = host reset

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Wed, 8 Apr 2020 23:25:45 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Qian Cai <cai@....pw>, Elver Marco <elver@...gle.com>
Cc:     "paul E. McKenney" <paulmck@...nel.org>,
        kasan-dev <kasan-dev@...glegroups.com>,
        LKML <linux-kernel@...r.kernel.org>, kvm@...r.kernel.org
Subject: Re: KCSAN + KVM = host reset

On 08/04/20 22:59, Qian Cai wrote:
> Running a simple thing on this AMD host would trigger a reset right away.
> Unselect KCSAN kconfig makes everything work fine (the host would also
> reset If only "echo off > /sys/kernel/debug/kcsan” before running qemu-kvm).

Is this a regression or something you've just started to play with?  (If
anything, the assembly language conversion of the AMD world switch that
is in linux-next could have reduced the likelihood of such a failure,
not increased it).

Paolo