Make sure framebuffer dimensions and tiling
parameters will not result in accesses beyond the
end of the GEM buffer they are bound to.
v3: Return EINVAL when creating FB against BO with
unsupported tiling
v5: Resolved against nouveau_framebuffer cleanup
Signed-off-by: James Jones <jajones@xxxxxxxxxx>
---
drivers/gpu/drm/nouveau/nouveau_display.c | 98 +++++++++++++++++++++++
1 file changed, 98 insertions(+)
diff --git a/drivers/gpu/drm/nouveau/nouveau_display.c b/drivers/gpu/drm/nouveau/nouveau_display.c
index 94f7fd48e1cf..3048a43a8d36 100644
--- a/drivers/gpu/drm/nouveau/nouveau_display.c
+++ b/drivers/gpu/drm/nouveau/nouveau_display.c
@@ -203,6 +203,76 @@ static const struct drm_framebuffer_funcs nouveau_framebuffer_funcs = {
.create_handle = drm_gem_fb_create_handle,
};
+static inline uint32_t
+nouveau_get_width_in_blocks(uint32_t stride)
+{
+ /* GOBs per block in the x direction is always one, and GOBs are
+ * 64 bytes wide
+ */
+ static const uint32_t log_block_width = 6;
+
+ return (stride + (1 << log_block_width) - 1) >> log_block_width;
+}
+
+static inline uint32_t
+nouveau_get_height_in_blocks(struct nouveau_drm *drm,
+ uint32_t height,
+ uint32_t log_block_height_in_gobs)
+{
+ uint32_t log_gob_height;
+ uint32_t log_block_height;
+
+ BUG_ON(drm->client.device.info.family < NV_DEVICE_INFO_V0_TESLA);
+
+ if (drm->client.device.info.family < NV_DEVICE_INFO_V0_FERMI)
+ log_gob_height = 2;
+ else
+ log_gob_height = 3;
+
+ log_block_height = log_block_height_in_gobs + log_gob_height;
+
+ return (height + (1 << log_block_height) - 1) >> log_block_height;
+}
+
+static int
+nouveau_check_bl_size(struct nouveau_drm *drm, struct nouveau_bo *nvbo,
+ uint32_t offset, uint32_t stride, uint32_t h,
+ uint32_t tile_mode)
+{
+ uint32_t gob_size, bw, bh;
+ uint64_t bl_size;
+
+ BUG_ON(drm->client.device.info.family < NV_DEVICE_INFO_V0_TESLA);
+
+ if (drm->client.device.info.chipset >= 0xc0) {
+ if (tile_mode & 0xF)
+ return -EINVAL;
+ tile_mode >>= 4;
+ }
+
+ if (tile_mode & 0xFFFFFFF0)
+ return -EINVAL;
+
+ if (drm->client.device.info.family < NV_DEVICE_INFO_V0_FERMI)
+ gob_size = 256;
+ else
+ gob_size = 512;
+
+ bw = nouveau_get_width_in_blocks(stride);
+ bh = nouveau_get_height_in_blocks(drm, h, tile_mode);
+
+ bl_size = bw * bh * (1 << tile_mode) * gob_size;
+
+ DRM_DEBUG_KMS("offset=%u stride=%u h=%u tile_mode=0x%02x bw=%u bh=%u gob_size=%u bl_size=%llu size=%lu\n",
+ offset, stride, h, tile_mode, bw, bh, gob_size, bl_size,
+ nvbo->bo.mem.size);
+
+ if (bl_size + offset > nvbo->bo.mem.size)
+ return -ERANGE;
+
+ return 0;
+}
+
int
nouveau_framebuffer_new(struct drm_device *dev,
const struct drm_mode_fb_cmd2 *mode_cmd,
@@ -210,7 +280,10 @@ nouveau_framebuffer_new(struct drm_device *dev,
struct drm_framebuffer **pfb)
{
struct nouveau_drm *drm = nouveau_drm(dev);
+ struct nouveau_bo *nvbo = nouveau_gem_object(gem);
struct drm_framebuffer *fb;
+ const struct drm_format_info *info;
+ unsigned int width, height, i;
int ret;
/* YUV overlays have special requirements pre-NV50 */
@@ -233,6 +306,31 @@ nouveau_framebuffer_new(struct drm_device *dev,
return -EINVAL;
}
+ info = drm_get_format_info(dev, mode_cmd);
+
+ for (i = 0; i < info->num_planes; i++) {
+ width = drm_format_info_plane_width(info,
+ mode_cmd->width,
+ i);
+ height = drm_format_info_plane_height(info,
+ mode_cmd->height,
+ i);
+
+ if (nvbo->kind) {
+ ret = nouveau_check_bl_size(drm, nvbo,
+ mode_cmd->offsets[i],
+ mode_cmd->pitches[i],
+ height, nvbo->mode);
+ if (ret)
+ return ret;
+ } else {
+ uint32_t size = mode_cmd->pitches[i] * height;
+
+ if (size + mode_cmd->offsets[i] > nvbo->bo.mem.size)
+ return -ERANGE;
+ }
+ }
+
if (!(fb = *pfb = kzalloc(sizeof(*fb), GFP_KERNEL)))
return -ENOMEM;
--
2.17.1
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