Re: [edk2-devel] [RFC PATCH 1/3] MdePkg: Update MemoryAttributesTable to v2.10

["Michael D Kinney" <michael.d.kinney@intel.com>]

Reviewed-by: Michael D Kinney <michael.d.kinney@intel.com>


> -----Original Message-----
> From: devel@edk2.groups.io <devel@edk2.groups.io> On Behalf Of Ard Biesheuvel
> Sent: Thursday, February 2, 2023 10:04 AM
> To: devel@edk2.groups.io
> Cc: Ard Biesheuvel <ardb@kernel.org>; Kinney, Michael D <michael.d.kinney@intel.com>; Gao, Liming <gaoliming@byosoft.com.cn>; Yao,
> Jiewen <jiewen.yao@intel.com>; Kubacki, Michael <michael.kubacki@microsoft.com>; Sean Brogan <sean.brogan@microsoft.com>; Rebecca
> Cran <quic_rcran@quicinc.com>; Leif Lindholm <quic_llindhol@quicinc.com>; Sami Mujawar <sami.mujawar@arm.com>; Taylor Beebe
> <t@taylorbeebe.com>
> Subject: [edk2-devel] [RFC PATCH 1/3] MdePkg: Update MemoryAttributesTable to v2.10
> 
> UEFI v2.10 introduces a new flag to the memory attributes table to
> inform the OS whether or not runtime services code regions were emitted
> by the compiler with guard instructions for forward edge control flow
> integrity enforcement.
> 
> So update our definition accordingly.
> 
> Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
> ---
>  MdePkg/Include/Guid/MemoryAttributesTable.h | 8 ++++++--
>  1 file changed, 6 insertions(+), 2 deletions(-)
> 
> diff --git a/MdePkg/Include/Guid/MemoryAttributesTable.h b/MdePkg/Include/Guid/MemoryAttributesTable.h
> index 82f83a67b96d..238c14ff92df 100644
> --- a/MdePkg/Include/Guid/MemoryAttributesTable.h
> +++ b/MdePkg/Include/Guid/MemoryAttributesTable.h
> @@ -17,11 +17,15 @@ typedef struct {
>    UINT32    Version;
> 
>    UINT32    NumberOfEntries;
> 
>    UINT32    DescriptorSize;
> 
> -  UINT32    Reserved;
> 
> +  UINT32    Flags;
> 
>    // EFI_MEMORY_DESCRIPTOR Entry[1];
> 
>  } EFI_MEMORY_ATTRIBUTES_TABLE;
> 
> 
> 
> -#define EFI_MEMORY_ATTRIBUTES_TABLE_VERSION  0x00000001
> 
> +#define EFI_MEMORY_ATTRIBUTES_TABLE_VERSION  0x00000002
> 
> +
> 
> +#define EFI_MEMORY_ATTRIBUTES_FLAGS_RT_FORWARD_CONTROL_FLOW_GUARD  0x1
> 
> +// BIT0 implies that Runtime code includes the forward control flow guard
> 
> +// instruction, such as X86 CET-IBT or ARM BTI.
> 
> 
> 
>  extern EFI_GUID  gEfiMemoryAttributesTableGuid;
> 
> 
> 
> --
> 2.39.1
> 
> 
> 
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