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Re: [PATCH 0/2][XTF] build: suppress GNU ld 2.39 warnings
- To: Andrew Cooper <Andrew.Cooper3@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Tue, 4 Oct 2022 09:01:51 +0200
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- Cc: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Tue, 04 Oct 2022 07:02:09 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 03.10.2022 15:44, Andrew Cooper wrote:
> On 29/09/2022 11:03, Jan Beulich wrote:
>> Like done previously for the hypervisor and elsewhere.
>>
>> 1: suppress GNU ld 2.39 warning about RWX load segments
>> 2: silence GNU ld 2.39 warning about executable stacks
>
> I've taken these, and dropped the `-no-pie`, but there's something else too.
>
> $readelf -Wa tests/example/test-hvm64-example
> ...
>
> No version information found in this file.
>
> Displaying notes found in: .note
> Owner Data size Description
> GNU 0x00000020 NT_GNU_PROPERTY_TYPE_0
> Properties: x86 feature used: x86, <corrupt type (0) datasz: 0xc0010002>
>
> readelf: Warning: note with invalid namesz and/or descsz found at offset
> 0x30
> readelf: Warning: type: 0x12, namesize: 0x00000004, descsize:
> 0x00000004, alignment: 8
>
>
> It's only hvm64 which reads as corrupt, so I think there's some
> collateral damage with the conversion between ELF64 and ELF32.
Iirc there was a binary-incompatible change (accompanying an
incompatible change to the ELF spec) to how notes are generated /
processed for 64-bit objects (some hand waving involved here, as
this did happen quite a while back). I assume the .note section(s)
will need converting (to insert / remove padding) in the course of
converting between ELF32 and ELF64.
Jan
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