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

[Luke Nowakowski-Krijger]

Acked-by: Luke Nowakowski-Krijger <luke.nowakowskikrijger at canonical.com>

On Mon, Jan 16, 2023 at 11:25 AM Cengiz Can <cengiz.can at canonical.com>
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(-)
>
>
> --
> 2.37.2
>
>
> --
> kernel-team mailing list
> kernel-team at lists.ubuntu.com
> https://lists.ubuntu.com/mailman/listinfo/kernel-team
>
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