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SecurityPkg/RngDxe: Replace Pcd with Sp80090Ctr256Guid
gEfiRngAlgorithmSp80090Ctr256Guid was used as the default algorithm in RngGetRNG(). The commit below set the default algorithm to PcdCpuRngSupportedAlgorithm, which is a zero GUID by default. As the Pcd value is not defined for any platform in the edk2-platfoms repository, assume it was an error and go back to the first version, using gEfiRngAlgorithmSp80090Ctr256Guid. Fixes: 4e5ecdbac8bd ("SecurityPkg: Add support for RngDxe on AARCH64") Signed-off-by: Pierre Gondois <Pierre.Gondois@arm.com> Acked-by: Jiewen Yao <jiewen.yao@intel.com>
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@ -127,7 +127,6 @@ ArchGetSupportedRngAlgorithms (
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)
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{
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{
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UINTN RequiredSize;
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UINTN RequiredSize;
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EFI_RNG_ALGORITHM *CpuRngSupportedAlgorithm;
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RequiredSize = 2 * sizeof (EFI_RNG_ALGORITHM);
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RequiredSize = 2 * sizeof (EFI_RNG_ALGORITHM);
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@ -136,9 +135,7 @@ ArchGetSupportedRngAlgorithms (
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return EFI_BUFFER_TOO_SMALL;
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return EFI_BUFFER_TOO_SMALL;
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}
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}
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CpuRngSupportedAlgorithm = PcdGetPtr (PcdCpuRngSupportedAlgorithm);
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CopyMem (&RNGAlgorithmList[0], &gEfiRngAlgorithmSp80090Ctr256Guid, sizeof (EFI_RNG_ALGORITHM));
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CopyMem (&RNGAlgorithmList[0], CpuRngSupportedAlgorithm, sizeof (EFI_RNG_ALGORITHM));
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// x86 platforms also support EFI_RNG_ALGORITHM_RAW via RDSEED
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// x86 platforms also support EFI_RNG_ALGORITHM_RAW via RDSEED
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CopyMem (&RNGAlgorithmList[1], &gEfiRngAlgorithmRaw, sizeof (EFI_RNG_ALGORITHM));
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CopyMem (&RNGAlgorithmList[1], &gEfiRngAlgorithmRaw, sizeof (EFI_RNG_ALGORITHM));
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