linux-kernel - Re: [PATCH] KVM: coalesced

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Message-ID: <20190918152042.de4gxtaf3ddfyhyt@willie-the-truck>
Date:   Wed, 18 Sep 2019 16:20:43 +0100
From:   Will Deacon <will@...nel.org>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        kernellwp@...il.com, gregkh@...uxfoundation.org,
        Matt Delco <delco@...omium.org>, stable@...r.kernel.org,
        Jim Mattson <jmattson@...gle.com>
Subject: Re: [PATCH] KVM: coalesced_mmio: add bounds checking

On Wed, Sep 18, 2019 at 04:01:42PM +0200, Paolo Bonzini wrote:
> From: Matt Delco <delco@...omium.org>
> 
> The first/last indexes are typically shared with a user app.
> The app can change the 'last' index that the kernel uses
> to store the next result.  This change sanity checks the index
> before using it for writing to a potentially arbitrary address.
> 
> This fixes CVE-2019-14821.
> 
> Cc: stable@...r.kernel.org
> Fixes: 5f94c1741bdc ("KVM: Add coalesced MMIO support (common part)")
> Signed-off-by: Matt Delco <delco@...omium.org>
> Signed-off-by: Jim Mattson <jmattson@...gle.com>
> Reported-by: syzbot+983c866c3dd6efa3662a@...kaller.appspotmail.com
> [Use READ_ONCE. - Paolo]
> Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
> ---
>  virt/kvm/coalesced_mmio.c | 19 +++++++++++--------
>  1 file changed, 11 insertions(+), 8 deletions(-)

Acked-by: Will Deacon <will@...nel.org>

Will