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Re: [MINI-OS PATCH] x86: have .note.Xen segment contents before other .note.* ones
- To: Juergen Gross <jgross@xxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Fri, 28 Nov 2025 15:31:35 +0100
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- Cc: samuel.thibault@xxxxxxxxxxxx, minios-devel@xxxxxxxxxxxxxxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Fri, 28 Nov 2025 14:31:43 +0000
- List-id: Mini-os development list <minios-devel.lists.xenproject.org>
On 28.11.2025 14:38, Juergen Gross wrote:
> Today the linker script of Mini-OS specifies to merge all .note*
> sections into a single section .note:
>
> .note : {
> *(.note)
> *(.note.*)
> }
>
> It seems as if ld will use the attributes of the first .note* segment
> found during the linking process for the final .note segment.
>
> Somewhere between binutils 2.43 and 2.45 something changed resulting in
> .note.GNU-stack being the first .note* segment found. Unfortunately
> this segment has unusual attributes: it has PROGBITS instead of NOTE as
> type, resulting in the Xen ELF parsing to no longer look into it for
> finding the Xen ELF-notes. This in turn will result in failure while
> trying to parse the binary, which will let domain creation fail.
>
> In order to avoid this issue, enhance the linker script to merge
> .note.Xen before other .note.* segments, resulting in the final .note
> segment to still have the NOTE type.
>
> Fixes: 6d1cc81d049f ("x86: switch to use elfnote")
> Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
I wonder though ...
> --- a/arch/x86/minios-x86.lds.S
> +++ b/arch/x86/minios-x86.lds.S
> @@ -33,6 +33,7 @@ SECTIONS
>
> .note : {
> *(.note)
> + *(.note.Xen)
> *(.note.*)
> }
... what use .note here is. Can't it be dropped in exchange?
Jan
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