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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: 4e5ecdbac8 ("SecurityPkg: Add support for RngDxe on AARCH64")
Signed-off-by: Pierre Gondois <Pierre.Gondois@arm.com>
Acked-by: Jiewen Yao <jiewen.yao@intel.com>
This commit is contained in:
Pierre Gondois 2022-10-28 17:32:51 +02:00 committed by mergify[bot]
parent 8a89747844
commit aade3b93fe
1 changed files with 2 additions and 5 deletions
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7
SecurityPkg/RandomNumberGenerator/RngDxe/Rand/RngDxe.c
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@ -126,8 +126,7 @@ ArchGetSupportedRngAlgorithms (
OUT EFI_RNG_ALGORITHM *RNGAlgorithmList
)
{
UINTN RequiredSize;
EFI_RNG_ALGORITHM *CpuRngSupportedAlgorithm;
UINTN RequiredSize;
RequiredSize = 2 * sizeof (EFI_RNG_ALGORITHM);
@ -136,9 +135,7 @@ ArchGetSupportedRngAlgorithms (
return EFI_BUFFER_TOO_SMALL;
}
CpuRngSupportedAlgorithm = PcdGetPtr (PcdCpuRngSupportedAlgorithm);
CopyMem (&RNGAlgorithmList[0], CpuRngSupportedAlgorithm, sizeof (EFI_RNG_ALGORITHM));
CopyMem (&RNGAlgorithmList[0], &gEfiRngAlgorithmSp80090Ctr256Guid, sizeof (EFI_RNG_ALGORITHM));
// x86 platforms also support EFI_RNG_ALGORITHM_RAW via RDSEED
CopyMem (&RNGAlgorithmList[1], &gEfiRngAlgorithmRaw, sizeof (EFI_RNG_ALGORITHM));