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44 lines
1.4 KiB
44 lines
1.4 KiB
From 4947d363211159647e9266fa20ad9d4c8bc52f71 Mon Sep 17 00:00:00 2001
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From: Gerd Hoffmann <kraxel@redhat.com>
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Date: Fri, 31 May 2024 09:49:13 +0200
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Subject: [PATCH] SecurityPkg/RngDxe: add rng test
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Check whenever RngLib actually returns random numbers, only return
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a non-zero number of Algorithms if that is the case.
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This has the effect that RndDxe loads and installs EFI_RNG_PROTOCOL
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only in case it can actually deliver random numbers.
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Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
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(cherry picked from commit a61bc0accb8a76edba4f073fdc7bafc908df045d)
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---
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SecurityPkg/RandomNumberGenerator/RngDxe/Rand/RngDxe.c | 8 +++++++-
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1 file changed, 7 insertions(+), 1 deletion(-)
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diff --git a/SecurityPkg/RandomNumberGenerator/RngDxe/Rand/RngDxe.c b/SecurityPkg/RandomNumberGenerator/RngDxe/Rand/RngDxe.c
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index 5723ed6957..8b0742bab6 100644
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--- a/SecurityPkg/RandomNumberGenerator/RngDxe/Rand/RngDxe.c
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+++ b/SecurityPkg/RandomNumberGenerator/RngDxe/Rand/RngDxe.c
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@@ -23,6 +23,7 @@
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#include <Library/BaseLib.h>
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#include <Library/BaseMemoryLib.h>
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+#include <Library/RngLib.h>
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#include "RngDxeInternals.h"
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@@ -43,7 +44,12 @@ GetAvailableAlgorithms (
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VOID
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)
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{
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- mAvailableAlgoArrayCount = RNG_ALGORITHM_COUNT;
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+ UINT64 RngTest;
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+
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+ if (GetRandomNumber64 (&RngTest)) {
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+ mAvailableAlgoArrayCount = RNG_ALGORITHM_COUNT;
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+ }
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+
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return EFI_SUCCESS;
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}
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