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Subject: Re: [PATCH v3 0/3] xen: harden blkfront against malicious backends
To:     xen-devel@lists.xenproject.org, linux-block@vger.kernel.org,
        linux-kernel@vger.kernel.org
Cc:     Boris Ostrovsky <boris.ostrovsky@oracle.com>,
        Stefano Stabellini <sstabellini@kernel.org>,
        Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
        =?UTF-8?Q?Roger_Pau_Monn=c3=a9?= <roger.pau@citrix.com>,
        Jens Axboe <axboe@kernel.dk>
References: <20210730103854.12681-1-jgross@suse.com>
From:   Juergen Gross <jgross@suse.com>
Message-ID: <324eab71-86ae-790a-d19c-97bb35b4f354@suse.com>
Date:   Mon, 30 Aug 2021 12:16:09 +0200
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From: Juergen Gross <jgross@suse.com>
To: xen-devel@lists.xenproject.org, linux-block@vger.kernel.org,
 linux-kernel@vger.kernel.org
Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>,
 Stefano Stabellini <sstabellini@kernel.org>,
 Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
 =?UTF-8?Q?Roger_Pau_Monn=c3=a9?= <roger.pau@citrix.com>,
 Jens Axboe <axboe@kernel.dk>
Message-ID: <324eab71-86ae-790a-d19c-97bb35b4f354@suse.com>
Subject: Re: [PATCH v3 0/3] xen: harden blkfront against malicious backends
References: <20210730103854.12681-1-jgross@suse.com>
In-Reply-To: <20210730103854.12681-1-jgross@suse.com>

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On 30.07.21 12:38, Juergen Gross wrote:
> Xen backends of para-virtualized devices can live in dom0 kernel, dom0
> user land, or in a driver domain. This means that a backend might
> reside in a less trusted environment than the Xen core components, so
> a backend should not be able to do harm to a Xen guest (it can still
> mess up I/O data, but it shouldn't be able to e.g. crash a guest by
> other means or cause a privilege escalation in the guest).
>=20
> Unfortunately blkfront in the Linux kernel is fully trusting its
> backend. This series is fixing blkfront in this regard.
>=20
> It was discussed to handle this as a security problem, but the topic
> was discussed in public before, so it isn't a real secret.
>=20
> It should be mentioned that a similar series has been posted some years=

> ago by Marek Marczykowski-G=C3=B3recki, but this series has not been ap=
plied
> due to a Xen header not having been available in the Xen git repo at
> that time. Additionally my series is fixing some more DoS cases.
>=20
> Changes in V3:
> - patch 3: insert missing unlock in error case (kernel test robot)
> - patch 3: use %#x as format for printing wrong operation value
>    (Roger Pau Monn=C3=A9)
>=20
> Changes in V2:
> - put blkfront patches into own series
> - some minor comments addressed
>=20
> Juergen Gross (3):
>    xen/blkfront: read response from backend only once
>    xen/blkfront: don't take local copy of a request from the ring page
>    xen/blkfront: don't trust the backend response data blindly
>=20
>   drivers/block/xen-blkfront.c | 126 +++++++++++++++++++++++-----------=
-
>   1 file changed, 84 insertions(+), 42 deletions(-)
>=20

Series pushed to xen/tip.git for-linus-5.15


Juergen

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