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Re: [PATCH v2 00/11] x86/EFI: prevent write-execute sections
- To: Roger Pau Monné <roger.pau@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Mon, 7 Apr 2025 16:04:18 +0200
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- Cc: Doug Goldstein <cardoe@xxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, "Daniel P. Smith" <dpsmith@xxxxxxxxxxxxxxxxxxxx>, Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Bertrand Marquis <bertrand.marquis@xxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>, Shawn Anastasio <sanastasio@xxxxxxxxxxxxxxxxxxxxx>, Alistair Francis <alistair.francis@xxxxxxx>, Bob Eshleman <bobbyeshleman@xxxxxxxxx>, Connor Davis <connojdavis@xxxxxxxxx>, Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Mon, 07 Apr 2025 14:04:27 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 01.04.2025 15:26, Roger Pau Monné wrote:
> nxcompat should be enabled by default I think? I can of course make
> it explicit by adding to the PE link command line.
--nxcompat wasn't the default originally, then was made the default for MinGW
(and by mistake for everything else as well), then it being the default was
undone for Cygwin. I've meanwhile submitted a patch to undo it for everything
that isn't MinGW [1]. I simply don't think the linker is in the position to
declare that every binary is NX-compatible. It's the programmers who have to
determine that. With the flag not being honored everywhere one also can't
simply test an EFI binary on a couple of hosts, at least as long as the EFI
implementation there is a black box.
So yes, we will need to pass --nxcompat explicitly in any event.
Jan
[1] https://sourceware.org/pipermail/binutils/2025-April/140422.html
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