On Wed, Oct 16, 2013 at 08:12:35PM -0400, Pavel Roskin wrote: > The amount of data wanted by the userspace caller is encoded in the > ioctl number. Generic drm ioctls were ignoring it. > > As a result, Intel Xorg driver didn't work for i386 userspace on x86_64 > kernel on some systems. sizeof(struct drm_mode_get_connector) is 76 > bytes on i686 and 80 bytes on x86_64 due to the tail alignment (the data > positions match). The userspace was using the 4 bytes after the > structure to hold the result of the ioctl. Since drm_ioctl() was > copying 80 bytes instead of 76, it was clobbering that data. > > A workaround has been committed to xf86-video-intel. > > Signed-off-by: Pavel Roskin <proski@xxxxxxx> > Cc: stable@xxxxxxxxxxxxxxx Similar patch: http://lists.freedesktop.org/archives/dri-devel/2013-October/047412.html -Chris -- Chris Wilson, Intel Open Source Technology Centre _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/dri-devel
