APPLIED[L/J/F]: [SRU Focal, Jammy, Lunar, OEM-6.0, OEM-6.1, OEM-5.17 0/2] CVE-2023-20593

[Stefan Bader]

On 28.07.23 17:21, Thadeu Lima de Souza Cascardo wrote:
> [Impact]
> Use-after-free on register allocation after speculative execution leads
> to data leak and corruption on AMD Zen2 processors.
> 
> [Test case]
> Public PoC was used to test the fix on 5.15 and 6.2 kernels.
> 
> [Backports]
> Some conflict fixups due to some missing commits were necessary. They were
> mostly for context adjustment and not any real changes. Except for 5.17,
> where the MSR definition was not present in the header and was added there.
> 
> [Potential regression]
> This can cause boot issues or WARNings during boot if setting the MSR on
> unsupported platforms. It can also impact performance or other behavior
> change due to setting the chicken bit.
> 
> Borislav Petkov (AMD) (2):
>    x86/cpu/amd: Move the errata checking functionality up
>    x86/cpu/amd: Add a Zenbleed fix
> 
>   arch/x86/include/asm/microcode.h     |   1 +
>   arch/x86/include/asm/microcode_amd.h |   2 +
>   arch/x86/include/asm/msr-index.h     |   1 +
>   arch/x86/kernel/cpu/amd.c            | 199 +++++++++++++++++----------
>   arch/x86/kernel/cpu/common.c         |   2 +
>   5 files changed, 133 insertions(+), 72 deletions(-)
> 

Applied to lunar,jammy,focal:linux/master-next. Thanks.

-Stefan

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