Pierre Gondois 19438cff97 SecurityPkg/RngDxe: Use GetRngGuid() when probing RngLib ... BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=4151 The EFI_RNG_PROTOCOL can rely on the RngLib. The RngLib has multiple implementations, some of them are unsafe (e.g. BaseRngLibTimerLib). To allow the RngDxe to detect when such implementation is used, a GetRngGuid() function was added in a previous patch. The EFI_RNG_PROTOCOL can advertise multiple algorithms through Guids. The PcdCpuRngSupportedAlgorithm is currently used to advertise the RngLib in the Arm implementation. The issues of doing that are: - the RngLib implementation might not use CPU instructions, cf. the BaseRngLibTimerLib - most platforms don't set PcdCpuRngSupportedAlgorithm A GetRngGuid() was added to the RngLib in a previous patch, allowing to identify the algorithm implemented by the RngLib. Make use of this function and place the unsage algorithm at the last position in the mAvailableAlgoArray. Signed-off-by: Pierre Gondois <pierre.gondois@arm.com> Reviewed-by: Sami Mujawar <sami.mujawar@arm.com> Acked-by: Ard Biesheuvel <ardb@kernel.org> Acked-by: Jiewen Yao <Jiewen.yao@intel.com> Tested-by: Kun Qin <kun.qin@microsoft.com>		2023-09-08 09:48:55 +00:00
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AArch64Algo.c	SecurityPkg/RngDxe: Use GetRngGuid() when probing RngLib	2023-09-08 09:48:55 +00:00