Description: Intel Gen8/Gen9 Graphics DoS
References:
Notes:
 bwh> Reading some registers on gen8/gen9
 bwh> GPUs in low power state can cause a system hang.  It's not clear
 bwh> how an unprivileged user would trigger this, though.
Bugs:
upstream: released (5.4-rc8) [1d85a299c4db57c55e0229615132c964d17aa765, 7e34f4e4aad3fd34c02b294a3cf2321adf5b4438]
4.19-upstream-stable: released (4.19.84) [011b7173cbdbd1a5f1826656693ea51516f15dc1, 255ed51599dea571ac15afc676b2705cf2f83975]
4.9-upstream-stable: released (4.9.201) [ebd6ded190ed0920c16eb63f274b50ca050e46fb, 00194ecfb32cab5bc20ce1308c681c47094015bd]
3.16-upstream-stable: released (3.16.77) [5013e6d917ac9f3df823d94d17e9cfe99c003517]
sid: released (5.3.9-2) [bugfix/x86/i915/0011-drm-i915-Lower-RM-timeout-to-avoid-DSI-hard-hangs.patch, bugfix/x86/i915/0012-drm-i915-gen8-Add-RC6-CTX-corruption-WA.patch]
4.19-buster-security: released (4.19.67-2+deb10u2) [bugfix/x86/i915/0011-drm-i915-Lower-RM-timeout-to-avoid-DSI-hard-hangs.patch, bugfix/x86/i915/0012-drm-i915-gen8-Add-RC6-CTX-corruption-WA.patch]
4.9-stretch-security: released (4.9.189-3+deb9u2) [bugfix/x86/i915/0011-drm-i915-Lower-RM-timeout-to-avoid-DSI-hard-hangs.patch, bugfix/x86/i915/0012-drm-i915-gen8-Add-RC6-CTX-corruption-WA.patch]
3.16-jessie-security: released (3.16.76-1) [bugfix/x86/drm-i915-gen8-add-rc6-ctx-corruption-wa.patch]