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Re: [PATCH v3 4/4] x86: Split .init section to satisfy UEFI CA memory mitigation
- To: Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>, Frediano Ziglio <freddy77@xxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Tue, 16 Jun 2026 12:29:00 +0100
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx, Frediano Ziglio <frediano.ziglio@xxxxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Teddy Astie <teddy.astie@xxxxxxxxxx>, Frediano Ziglio <frediano.ziglio@xxxxxxxxxx>
- Delivery-date: Tue, 16 Jun 2026 11:29:18 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 16/06/2026 12:20 pm, Marek Marczykowski-Górecki wrote:
> On Tue, Jun 16, 2026 at 11:13:36AM +0100, Frediano Ziglio wrote:
>> From: Frediano Ziglio <frediano.ziglio@xxxxxxxxx>
>>
>> Currently .init section is both writeable and executable, split data and code
>> to have 2 sections satisfying W^X rule.
>>
>> It is a requirement for NX_COMPAT so the PE can be loaded with W^X perms
>> in the pagetables.
>>
>> NX_COMPAT is a requirement from shim-review,
>> https://github.com/rhboot/shim-review#do-you-have-the-nx-bit-set-in-your-shim-if-so-is-your-entire-boot-stack-nx-compatible-and-what-testing-have-you-done-to-ensure-such-compatibility
>>
>> Signed-off-by: Frediano Ziglio <frediano.ziglio@xxxxxxxxxx>
> Acked-by: Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>
>
> Is that the last piece necessary to satisfy the NX_COMPAT requirement? If
> so, I suppose a subsequent patch should actually set the
> IMAGE_DLLCHARACTERISTICS_NX_COMPAT bit (IIUC ld --nxcompat option), right?
We need to satisfy everything in
https://github.com/xenserver/xen.pg/blob/XS-9/patches/correct-sections-permissions.patch
.reloc needs to be non-discardable and writeable. This will require a
very recent binutils and a patch (series?) from Jan.
~Andrew
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