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Tsirkin" , =?UTF-8?q?Alex=20Benn=C3=A9e?= , Dmitry Osipenko Subject: [PATCH 1/2] hw/display: factor out the scanout blob to fb conversion Date: Mon, 4 Nov 2024 16:53:47 +0000 Message-Id: <20241104165348.2361299-2-alex.bennee@linaro.org> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20241104165348.2361299-1-alex.bennee@linaro.org> References: <20241104165348.2361299-1-alex.bennee@linaro.org> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" 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; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2a00:1450:4864:20::636; envelope-from=alex.bennee@linaro.org; helo=mail-ej1-x636.google.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, 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: 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 @linaro.org) X-ZM-MESSAGEID: 1730739278749116600 There are two identical sequences of a code doing the same thing that raise warnings with Coverity. Before fixing those issues lets factor out the common code into a helper function we can share. Signed-off-by: Alex Benn=C3=A9e Cc: Dmitry Osipenko --- include/hw/virtio/virtio-gpu.h | 15 +++++++++ hw/display/virtio-gpu-virgl.c | 21 +----------- hw/display/virtio-gpu.c | 60 +++++++++++++++++++++------------- 3 files changed, 53 insertions(+), 43 deletions(-) diff --git a/include/hw/virtio/virtio-gpu.h b/include/hw/virtio/virtio-gpu.h index 553799b8cc..90e4abe788 100644 --- a/include/hw/virtio/virtio-gpu.h +++ b/include/hw/virtio/virtio-gpu.h @@ -333,6 +333,21 @@ void virtio_gpu_update_cursor_data(VirtIOGPU *g, struct virtio_gpu_scanout *s, uint32_t resource_id); =20 +/** + * virtio_gpu_scanout_blob_to_fb() - fill out fb based on scanout data + * fb: the frame-buffer descriptor to fill out + * ss: the scanout blob data + * blob_size: the maximum size the blob can accommodate + * + * This will check we have enough space for the frame taking into + * account that stride for all but the last line. + * + * Returns true on success, otherwise logs guest error and returns false + */ +bool virtio_gpu_scanout_blob_to_fb(struct virtio_gpu_framebuffer *fb, + struct virtio_gpu_set_scanout_blob *ss, + uint64_t blob_size); + /* virtio-gpu-udmabuf.c */ bool virtio_gpu_have_udmabuf(void); void virtio_gpu_init_udmabuf(struct virtio_gpu_simple_resource *res); diff --git a/hw/display/virtio-gpu-virgl.c b/hw/display/virtio-gpu-virgl.c index eedae7357f..35599cddab 100644 --- a/hw/display/virtio-gpu-virgl.c +++ b/hw/display/virtio-gpu-virgl.c @@ -852,26 +852,7 @@ static void virgl_cmd_set_scanout_blob(VirtIOGPU *g, return; } =20 - fb.format =3D virtio_gpu_get_pixman_format(ss.format); - if (!fb.format) { - qemu_log_mask(LOG_GUEST_ERROR, "%s: pixel format not supported %d\= n", - __func__, ss.format); - cmd->error =3D VIRTIO_GPU_RESP_ERR_INVALID_PARAMETER; - return; - } - - fb.bytes_pp =3D DIV_ROUND_UP(PIXMAN_FORMAT_BPP(fb.format), 8); - fb.width =3D ss.width; - fb.height =3D ss.height; - fb.stride =3D ss.strides[0]; - fb.offset =3D ss.offsets[0] + ss.r.x * fb.bytes_pp + ss.r.y * fb.strid= e; - - fbend =3D fb.offset; - fbend +=3D fb.stride * (ss.r.height - 1); - fbend +=3D fb.bytes_pp * ss.r.width; - if (fbend > res->base.blob_size) { - qemu_log_mask(LOG_GUEST_ERROR, "%s: fb end out of range\n", - __func__); + if (!virtio_gpu_scanout_blob_to_fb(&fb, &ss, res->blob_size)) { cmd->error =3D VIRTIO_GPU_RESP_ERR_INVALID_PARAMETER; return; } diff --git a/hw/display/virtio-gpu.c b/hw/display/virtio-gpu.c index c0570ef856..e7ca8fd1cf 100644 --- a/hw/display/virtio-gpu.c +++ b/hw/display/virtio-gpu.c @@ -721,13 +721,48 @@ static void virtio_gpu_set_scanout(VirtIOGPU *g, &fb, res, &ss.r, &cmd->error); } =20 +bool virtio_gpu_scanout_blob_to_fb(struct virtio_gpu_framebuffer *fb, + struct virtio_gpu_set_scanout_blob *ss, + uint64_t blob_size) +{ + uint64_t fbend; + + fb->format =3D virtio_gpu_get_pixman_format(ss->format); + if (!fb->format) { + qemu_log_mask(LOG_GUEST_ERROR, + "%s: host couldn't handle guest format %d\n", + __func__, ss->format); + return false; + } + + fb->bytes_pp =3D DIV_ROUND_UP(PIXMAN_FORMAT_BPP(fb->format), 8); + fb->width =3D ss->width; + fb->height =3D ss->height; + fb->stride =3D ss->strides[0]; + fb->offset =3D ss->offsets[0] + ss->r.x * fb->bytes_pp + ss->r.y * fb-= >stride; + + fbend =3D fb->offset; + fbend +=3D fb->stride * (ss->r.height - 1); + fbend +=3D fb->bytes_pp * ss->r.width; + + if (fbend > blob_size) { + qemu_log_mask(LOG_GUEST_ERROR, + "%s: fb end out of range\n", + __func__); + return false; + } + + return true; +} + + + static void virtio_gpu_set_scanout_blob(VirtIOGPU *g, struct virtio_gpu_ctrl_command *cm= d) { struct virtio_gpu_simple_resource *res; struct virtio_gpu_framebuffer fb =3D { 0 }; struct virtio_gpu_set_scanout_blob ss; - uint64_t fbend; =20 VIRTIO_GPU_FILL_CMD(ss); virtio_gpu_scanout_blob_bswap(&ss); @@ -753,28 +788,7 @@ static void virtio_gpu_set_scanout_blob(VirtIOGPU *g, return; } =20 - fb.format =3D virtio_gpu_get_pixman_format(ss.format); - if (!fb.format) { - qemu_log_mask(LOG_GUEST_ERROR, - "%s: host couldn't handle guest format %d\n", - __func__, ss.format); - cmd->error =3D VIRTIO_GPU_RESP_ERR_INVALID_PARAMETER; - return; - } - - fb.bytes_pp =3D DIV_ROUND_UP(PIXMAN_FORMAT_BPP(fb.format), 8); - fb.width =3D ss.width; - fb.height =3D ss.height; - fb.stride =3D ss.strides[0]; - fb.offset =3D ss.offsets[0] + ss.r.x * fb.bytes_pp + ss.r.y * fb.strid= e; - - fbend =3D fb.offset; - fbend +=3D fb.stride * (ss.r.height - 1); - fbend +=3D fb.bytes_pp * ss.r.width; - if (fbend > res->blob_size) { - qemu_log_mask(LOG_GUEST_ERROR, - "%s: fb end out of range\n", - __func__); + if (!virtio_gpu_scanout_blob_to_fb(&fb, &ss, res->blob_size)) { cmd->error =3D VIRTIO_GPU_RESP_ERR_INVALID_PARAMETER; return; } --=20 2.39.5 From nobody Sat Nov 23 20:25:04 2024 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass(p=none dis=none) header.from=linaro.org ARC-Seal: i=1; a=rsa-sha256; t=1730739261; cv=none; d=zohomail.com; s=zohoarc; b=EgT5n2gZEHY3XY6RKq/QP4stFrOOC0d3ETZXc/fB1vtMWV7WTdx32idfHJ4GslOjbCWzgGElxOjeteEvDbxXOU3M2drclLbVzBz1UYPnsGhZDeSzg/+1QEZvVe/0dv1o4gITXzFkHAPxPD4W3AdQtU0uiXAH/Pb6M0fuM61iOXY= ARC-Message-Signature: i=1; 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Mon, 04 Nov 2024 08:53:50 -0800 (PST) From: =?UTF-8?q?Alex=20Benn=C3=A9e?= To: qemu-devel@nongnu.org Cc: "Michael S. Tsirkin" , =?UTF-8?q?Alex=20Benn=C3=A9e?= , Dmitry Osipenko Subject: [PATCH 2/2] hw/display: check frame buffer can hold blob Date: Mon, 4 Nov 2024 16:53:48 +0000 Message-Id: <20241104165348.2361299-3-alex.bennee@linaro.org> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20241104165348.2361299-1-alex.bennee@linaro.org> References: <20241104165348.2361299-1-alex.bennee@linaro.org> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" 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; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2a00:1450:4864:20::62a; envelope-from=alex.bennee@linaro.org; helo=mail-ej1-x62a.google.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, 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: 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 @linaro.org) X-ZM-MESSAGEID: 1730739262441116600 Coverity reports (CID 1564769, 1564770) that we potentially overflow by doing some 32x32 multiplies for something that ends up in a 64 bit value. Fix this by casting the first input to uint64_t to ensure a 64 bit multiply is used. While we are at it note why we split the calculation into stride and bytes_pp parts. Signed-off-by: Alex Benn=C3=A9e Cc: Dmitry Osipenko --- hw/display/virtio-gpu.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/hw/display/virtio-gpu.c b/hw/display/virtio-gpu.c index e7ca8fd1cf..572e4d92c6 100644 --- a/hw/display/virtio-gpu.c +++ b/hw/display/virtio-gpu.c @@ -741,9 +741,14 @@ bool virtio_gpu_scanout_blob_to_fb(struct virtio_gpu_f= ramebuffer *fb, fb->stride =3D ss->strides[0]; fb->offset =3D ss->offsets[0] + ss->r.x * fb->bytes_pp + ss->r.y * fb-= >stride; =20 + /* + * We calculate fb->stride for every line but the last which we + * calculate purely by its width. The stride will often be larger + * than width to meet alignment requirements. + */ fbend =3D fb->offset; - fbend +=3D fb->stride * (ss->r.height - 1); - fbend +=3D fb->bytes_pp * ss->r.width; + fbend +=3D (uint64_t) fb->stride * (ss->r.height - 1); + fbend +=3D (uint64_t) fb->bytes_pp * ss->r.width; =20 if (fbend > blob_size) { qemu_log_mask(LOG_GUEST_ERROR, --=20 2.39.5