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Re: [PATCH] x86/EFI: sanitize DLL characteristics in binary
- To: "Daniel P. Smith" <dpsmith@xxxxxxxxxxxxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Thu, 10 Apr 2025 16:58:05 +0200
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Marek Marczykowski <marmarek@xxxxxxxxxxxxxxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Thu, 10 Apr 2025 14:58:16 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 10.04.2025 16:39, Daniel P. Smith wrote:
> On 4/2/25 04:51, Jan Beulich wrote:
>> --- a/xen/arch/x86/arch.mk
>> +++ b/xen/arch/x86/arch.mk
>> @@ -113,6 +113,7 @@ efi-nr-fixups := $(shell LC_ALL=C $(OBJD
>>
>> ifeq ($(efi-nr-fixups),2)
>> MKRELOC := :
>> +EFI_LDFLAGS += --disable-high-entropy-va
>> else
>> MKRELOC := arch/x86/efi/mkreloc
>> # If the linker produced fixups but not precisely two of them, we need to
>> @@ -123,6 +124,8 @@ EFI_LDFLAGS += --disable-reloc-section
>> endif
>> endif
>>
>> +EFI_LDFLAGS += --dynamicbase
>> +
>> endif # $(XEN_BUILD_PE)
>>
>> export XEN_BUILD_EFI XEN_BUILD_PE
>
> Seems straightforward, will rely on your knowledge of binutils that
> there are no unattended effects from the flags.
>
> Acked-by: Daniel P. Smith <dpsmith@xxxxxxxxxxxxxxxxxxxx>
Thanks, but to clarify: If there's an issue here, it would be with the PE
loaders in the various EFI implementations; the binutils side is of little
concern (as to the effects of the flags).
Jan
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