From da8fda9932ab4a64a07d318d30b03baafbf1e0c1 Mon Sep 17 00:00:00 2001 From: Gerd Hoffmann Date: Fri, 31 May 2024 09:49:13 +0200 Subject: [PATCH] SecurityPkg/RngDxe: add rng test Check whenever RngLib actually returns random numbers, only return a non-zero number of Algorithms if that is the case. This has the effect that RndDxe loads and installs EFI_RNG_PROTOCOL only in case it can actually deliver random numbers. Signed-off-by: Gerd Hoffmann (cherry picked from commit a61bc0accb8a76edba4f073fdc7bafc908df045d) --- SecurityPkg/RandomNumberGenerator/RngDxe/Rand/RngDxe.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/SecurityPkg/RandomNumberGenerator/RngDxe/Rand/RngDxe.c b/SecurityPkg/RandomNumberGenerator/RngDxe/Rand/RngDxe.c index 5723ed6957..8b0742bab6 100644 --- a/SecurityPkg/RandomNumberGenerator/RngDxe/Rand/RngDxe.c +++ b/SecurityPkg/RandomNumberGenerator/RngDxe/Rand/RngDxe.c @@ -23,6 +23,7 @@ #include #include +#include #include "RngDxeInternals.h" @@ -43,7 +44,12 @@ GetAvailableAlgorithms ( VOID ) { - mAvailableAlgoArrayCount = RNG_ALGORITHM_COUNT; + UINT64 RngTest; + + if (GetRandomNumber64 (&RngTest)) { + mAvailableAlgoArrayCount = RNG_ALGORITHM_COUNT; + } + return EFI_SUCCESS; }