kernel: i915 kernel drm driver arbitrary ioremap

The i915 driver in 1 drivers/char/drm/i915dma.c in the Linux kernel 2.6.24 on Debian GNU/Linux and 2 sys/dev/pci/drm/i915drv.c in OpenBSD does not restrict the DRMI915HWSADDR ioctl to the Direct Rendering Manager DRM master, which allows local users to cause a denial of service memory corruption...