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Tsirkin" , Paolo Bonzini , Yiwei Zhang , Sergio Lopez Pascual Cc: Gert Wollny , qemu-devel@nongnu.org, Gurchetan Singh , Alyssa Ross , =?UTF-8?q?Roger=20Pau=20Monn=C3=A9?= , Alex Deucher , Stefano Stabellini , =?UTF-8?q?Christian=20K=C3=B6nig?= , Xenia Ragiadakou , Honglei Huang , Julia Zhang , Chen Jiqian , Rob Clark , Robert Beckett Subject: [PATCH v19 17/20] virtio-gpu: Validate hostmem mapping offset Date: Fri, 20 Feb 2026 03:16:31 +0300 Message-ID: <20260220001634.3579257-18-dmitry.osipenko@collabora.com> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20260220001634.3579257-1-dmitry.osipenko@collabora.com> References: <20260220001634.3579257-1-dmitry.osipenko@collabora.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-ZohoMailClient: External Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=136.143.188.112; envelope-from=dmitry.osipenko@collabora.com; helo=sender4-pp-f112.zoho.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_VALIDITY_CERTIFIED_BLOCKED=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: qemu development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity dmitry.osipenko@collabora.com) X-ZM-MESSAGEID: 1771546949609158500 Content-Type: text/plain; charset="utf-8" Check hostmem mapping boundaries originated from guest. Suggested-by: Akihiko Odaki Signed-off-by: Dmitry Osipenko --- hw/display/virtio-gpu-virgl.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/hw/display/virtio-gpu-virgl.c b/hw/display/virtio-gpu-virgl.c index b24386544e1b..9350d52a7079 100644 --- a/hw/display/virtio-gpu-virgl.c +++ b/hw/display/virtio-gpu-virgl.c @@ -791,6 +791,7 @@ static void virgl_cmd_resource_map_blob(VirtIOGPU *g, struct virtio_gpu_resource_map_blob mblob; struct virtio_gpu_virgl_resource *res; struct virtio_gpu_resp_map_info resp; + VirtIOGPUBase *b =3D VIRTIO_GPU_BASE(g); int ret; =20 VIRTIO_GPU_FILL_CMD(mblob); @@ -804,6 +805,15 @@ static void virgl_cmd_resource_map_blob(VirtIOGPU *g, return; } =20 + if (mblob.offset + res->base.blob_size > b->conf.hostmem || + mblob.offset + res->base.blob_size < mblob.offset) { + qemu_log_mask(LOG_GUEST_ERROR, + "%s: failed to map virgl resource: invalid offset\n", + __func__); + cmd->error =3D VIRTIO_GPU_RESP_ERR_INVALID_PARAMETER; + return; + } + ret =3D virtio_gpu_virgl_map_resource_blob(g, res, mblob.offset); if (ret) { cmd->error =3D VIRTIO_GPU_RESP_ERR_UNSPEC; --=20 2.52.0