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Re: [PATCH] x86/EFI: restrict use of --dynamicbase


  • To: Jan Beulich <jbeulich@xxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
  • From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
  • Date: Mon, 30 Jun 2025 13:21:49 +0100
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  • Cc: Roger Pau Monné <roger.pau@xxxxxxxxxx>, Marek Marczykowski <marmarek@xxxxxxxxxxxxxxxxxxxxxx>, Daniel Smith <dpsmith@xxxxxxxxxxxxxxxxxxxx>
  • Delivery-date: Mon, 30 Jun 2025 12:21:57 +0000
  • List-id: Xen developer discussion <xen-devel.lists.xenproject.org>

On 26/06/2025 1:45 pm, Jan Beulich wrote:
> At least GNU ld 2.35 takes this option to (also) mean what newer
> versions have controllable by --enable-reloc-section. From there being
> no relocations in check.efi (as we don't pass the option there) we infer
> that we need to involve mkreloc, we'd end up with two sets of
> relocations, which clearly isn't going to work. Furthermore the
> relocations ld emits in this case also aren't usable: For bsp_idt[] we
> end up with PE_BASE_RELOC_LOW ones, which efi_arch_relocate_image()
> (deliberately) doesn't know how to deal with. (Related to that is also
> why we check the number of relocations produced: The linker simply
> didn't get this right there, yet.)
>
> We also can't add the option to what we use when linking check.efi: That
> ld version then would produce relocations, but 4 of them (instead of the
> expected two). That would make us pass --disable-reloc-section, which
> however only ld 2.36 and newer understand.
>
> For such older binutils versions we therefore need to accept the slight
> inconsistency in DLL characteristics that the earlier commit meant to
> eliminate.
>
> Fixes: f2148773b8ac ("x86/EFI: sanitize DLL characteristics in binary")
> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>

Acked-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>



 


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