Re: [edk2-devel] [PATCH edk2-non-osi v2 1/1] Emulator/X86EmulatorDxe: Replace with MultiArchUefiPkg build

["Ard Biesheuvel via groups.io" <ardb=kernel.org@groups.io>]

On Mon, 9 Sept 2024 at 18:56, Rebecca Cran <rebecca@bsdio.com> wrote:
>
> On 9/9/24 10:13 AM, Ard Biesheuvel via groups.io wrote:
> > On Mon, 9 Sept 2024 at 18:11, Rebecca Cran <rebecca@bsdio.com> wrote:
> >> Replace the old X86EmulatorDxe with one built from
> >> https://github.com/intel/MultiArchUefiPkg. This is a much more modern,
> >> recent implementation that's more reliable and is actively maintained.
> > What was the conclusion in the end regarding NULL pointer deref handling?
>
> Andrei (cc'd) said:
>
>
> "- All memory but the zero page is visible to the emulator. See
> CpuNullReadCb/CpuNullWriteCb. See also TestNullDeref in
> Application/EmulatorTest. I don't remember if I added the behavior
> because this is what the original did, or because I actively tripped on
> the NULL accesses from some x86 code I was testing..."
>
>
> I don't know if that resolved the concern or not.
>

I think it does.

Acked-by: Ard Biesheuvel <ardb@kernel.org>


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