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bh=UK0hisR5IR/XPUhfLKsAU3JrlBWQI1s3gJcYm2HJOiw=; b=J/XxrpEh7FVE/UIQder4sOhmgMkBzoFpB/7Fnzw1/oewn33Ny7g7x4vB9JKvWHlugC9g43 aeeQnXYZFZmKFdkscLd59Iu3x9VvbKPW0PapngOBwOB2Q3yEODp4YE5gZyvem3q29Toifl 47ROmbLlAnkeDB/rMbTjoVq5eOii9aI= X-MC-Unique: YXqY7IAqPWqR9cBJDXW7ng-1 From: Stefan Hajnoczi To: qemu-devel@nongnu.org, Peter Maydell Subject: [PULL 06/13] virtio-crypto: don't modify elem->in/out_sg Date: Wed, 23 Sep 2020 17:10:24 +0100 Message-Id: <20200923161031.69474-7-stefanha@redhat.com> In-Reply-To: <20200923161031.69474-1-stefanha@redhat.com> References: <20200923161031.69474-1-stefanha@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=stefanha@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; 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charset="utf-8" A number of iov_discard_front/back() operations are made by virtio-crypto. The elem->in/out_sg iovec arrays are modified by these operations, resulting virtqueue_unmap_sg() calls on different addresses than were originally mapped. This is problematic because dirty memory may not be logged correctly, MemoryRegion refcounts may be leaked, and the non-RAM bounce buffer can be leaked. Take a copy of the elem->in/out_sg arrays so that the originals are preserved. The iov_discard_undo() API could be used instead (with better performance) but requires careful auditing of the code, so do the simple thing instead. Signed-off-by: Stefan Hajnoczi Reviewed-by: Li Qiang Message-Id: <20200917094455.822379-4-stefanha@redhat.com> --- hw/virtio/virtio-crypto.c | 17 ++++++++++++++--- 1 file changed, 14 insertions(+), 3 deletions(-) diff --git a/hw/virtio/virtio-crypto.c b/hw/virtio/virtio-crypto.c index 6da12e315f..54f9bbb789 100644 --- a/hw/virtio/virtio-crypto.c +++ b/hw/virtio/virtio-crypto.c @@ -228,6 +228,8 @@ static void virtio_crypto_handle_ctrl(VirtIODevice *vde= v, VirtQueue *vq) size_t s; =20 for (;;) { + g_autofree struct iovec *out_iov_copy =3D NULL; + elem =3D virtqueue_pop(vq, sizeof(VirtQueueElement)); if (!elem) { break; @@ -240,9 +242,12 @@ static void virtio_crypto_handle_ctrl(VirtIODevice *vd= ev, VirtQueue *vq) } =20 out_num =3D elem->out_num; - out_iov =3D elem->out_sg; + out_iov_copy =3D g_memdup(elem->out_sg, sizeof(out_iov[0]) * out_n= um); + out_iov =3D out_iov_copy; + in_num =3D elem->in_num; in_iov =3D elem->in_sg; + if (unlikely(iov_to_buf(out_iov, out_num, 0, &ctrl, sizeof(ctrl)) !=3D sizeof(ctrl))) { virtio_error(vdev, "virtio-crypto request ctrl_hdr too short"); @@ -582,6 +587,8 @@ virtio_crypto_handle_request(VirtIOCryptoReq *request) int queue_index =3D virtio_crypto_vq2q(virtio_get_queue_index(request-= >vq)); struct virtio_crypto_op_data_req req; int ret; + g_autofree struct iovec *in_iov_copy =3D NULL; + g_autofree struct iovec *out_iov_copy =3D NULL; struct iovec *in_iov; struct iovec *out_iov; unsigned in_num; @@ -598,9 +605,13 @@ virtio_crypto_handle_request(VirtIOCryptoReq *request) } =20 out_num =3D elem->out_num; - out_iov =3D elem->out_sg; + out_iov_copy =3D g_memdup(elem->out_sg, sizeof(out_iov[0]) * out_num); + out_iov =3D out_iov_copy; + in_num =3D elem->in_num; - in_iov =3D elem->in_sg; + in_iov_copy =3D g_memdup(elem->in_sg, sizeof(in_iov[0]) * in_num); + in_iov =3D in_iov_copy; + if (unlikely(iov_to_buf(out_iov, out_num, 0, &req, sizeof(req)) !=3D sizeof(req))) { virtio_error(vdev, "virtio-crypto request outhdr too short"); --=20 2.26.2