render/allocator: use legacy authentication for primary nodes
Closes:
@@ -35,8 +35,31 @@ static int reopen_drm_node(int drm_fd) {
int new_fd = open(name, O_RDWR | O_CLOEXEC);
if (new_fd < 0) {
wlr_log_errno(WLR_ERROR, "Failed to open DRM node '%s'", name);
+ free(name);
+ return -1;
}
+
free(name);
+
+ // If we're using a DRM primary node (e.g. because we're running under the
+ // DRM backend, or because we're on split render/display machine), we need
+ // to use the legacy DRM authentication mechanism to have the permission to
+ // manipulate buffers.
+ if (drmGetNodeTypeFromFd(new_fd) == DRM_NODE_PRIMARY) {
+ drm_magic_t magic;
+ if (drmGetMagic(new_fd, &magic) < 0) {
+ wlr_log_errno(WLR_ERROR, "drmGetMagic failed");
+ close(new_fd);
+ return -1;
+ }
+
+ if (drmAuthMagic(drm_fd, magic) < 0) {
+ wlr_log_errno(WLR_ERROR, "drmAuthMagic failed");
+ close(new_fd);
+ return -1;
+ }
+ }
+
return new_fd;
}
