APPLIED[X/B/F/G]: [SRU X/B/F/G] CVE-2020-27777 Restrict RTAS requests from userspace

[Ian May]

Applied to xenial/linux
Applied to bionic/linux
Applied to focal/linux
Applied to groovy/linux

Thanks
Ian

On 2020-12-01 17:50:46 , Thadeu Lima de Souza Cascardo wrote:
> rtas syscall allow userspace to request any RTAS call (firmware services). This
> should not be unrestricted under lockdown, so filter all requests in any case,
> to allow only those legitimate requests that might be used by real tools.
> 
> 
> 
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