ACK: [SRU Focal/OEM-5.14/Jammy] CVE-2022-4139

[Tim Gardner]

On 1/16/23 12:23 PM, Cengiz Can wrote:
> [Impact]
> An incorrect TLB flush issue was found in the Linux kernel’s GPU i915 kernel
> driver, potentially leading to random memory corruption or data leaks. This flaw
> could allow a local user to crash the system or escalate their privileges on the
> system.
> 
> [Fix]
> OEM-5.14 requires a prerequisite commit. And although announced `Fixes` commit
> is backported to as low as 4.4, fix is not applicable to any kernel
> below 5.4 as confirmed by the patch author. (i915 Gen12 is not supported
> in kernels below 5.4).
> 
> [Test case]
> Compile and boot tested on KVM.
> 
> [Potential regression]
> Possibly low. Fix only adds a i915 generation check and a bit flip on i915
> registers, so it's hard to guess what that would do on actual integrated
> Intel i915 Gen12 GPUs.
> 
> Andrzej Hajda (1):
>    drm/i915: fix TLB invalidation for Gen12 video and compute engines
> 
> -- Only for OEM-514:
> Chris Wilson (1):
>    drm/i915/gt: Serialize TLB invalidates with GT resets
> 
>   drivers/gpu/drm/i915/gt/intel_gt.c | 19 ++++++++++++++++++-
>   1 file changed, 18 insertions(+), 1 deletion(-)
> 
> 
Acked-by: Tim Gardner <tim.gardner at canonical.com>
-- 
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Tim Gardner
Canonical, Inc