linux-kernel - Re: [patch] kvm: suppress KVM_SET_GSI

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Message-ID: <20180213155816.GW3443@dhcp22.suse.cz>
Date:   Tue, 13 Feb 2018 16:58:16 +0100
From:   Michal Hocko <mhocko@...nel.org>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     David Rientjes <rientjes@...gle.com>,
        Radim Krčmář <rkrcmar@...hat.com>,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Subject: Re: [patch] kvm: suppress KVM_SET_GSI_ROUTING allocation failure

On Tue 13-02-18 16:49:20, Paolo Bonzini wrote:
> On 13/02/2018 16:44, Michal Hocko wrote:
> > On Tue 13-02-18 16:03:09, Paolo Bonzini wrote:
[...]
> >> There have been quite a few reports of this from syzkaller and generally
> >> we've fixed them.  It does seem like a recipe for NULL-pointer
> >> dereferences when the size is user-controlled (as in this case).
> > 
> > We do return NULL for that case regardless the above. The patch just
> > doesn't warn. Or do you think it is helpful to warn?
> 
> It certainly helps bringing potential issues in the spotlight (through
> fuzzing, mostly).

Fair enough.

-- 
Michal Hocko
SUSE Labs