Re: [Xen-devel] OVMF/Xen, Debian wheezy can't boot with NX on stack (Was: Re: [edk2] [PATCH] OvmfPkg: prevent code execution from DXE stack)

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 09.09.15 at 12:48, <lersek@xxxxxxxxxx> wrote:
> Personally I think that this dynamic approach is overkill (mainly
> because I'm fine with being unable to install Debian Wheezy guests, both
> wearing and not wearing my red fedora; and because the properties table
> feature is not active for *any* OVMF guests anyway, in practice).

I can only guess that PCD stands for "Platform Configuration Data".
However, I would want to suggest an even more dynamic approach:
Assuming that within the core UEFI code it ought to be possible to
flip between executable and non-executable mapping of the stack,
and considering that PE headers can carry target version numbers,
how about reverting to an executable stack as long as there's at
least one binary loaded that isn't claiming to be 2.5 compatible?

Jan


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