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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 <kraxel@redhat.com>
This commit is contained in:
Gerd Hoffmann 2024-05-31 09:49:13 +02:00 committed by Mike Beaton
parent 6ca9334dc8
commit 01bf6c6c9b
1 changed files with 7 additions and 1 deletions
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6
SecurityPkg/RandomNumberGenerator/RngDxe/Rand/RngDxe.c
View File

@ -23,6 +23,7 @@
#include <Library/BaseLib.h> #include <Library/BaseLib.h>
#include <Library/BaseMemoryLib.h> #include <Library/BaseMemoryLib.h>
#include <Library/RngLib.h>
#include "RngDxeInternals.h" #include "RngDxeInternals.h"
@ -43,7 +44,12 @@ GetAvailableAlgorithms (
VOID VOID
) )
{ {
UINT64 RngTest;
if (GetRandomNumber64 (&RngTest)) {
mAvailableAlgoArrayCount = RNG_ALGORITHM_COUNT; mAvailableAlgoArrayCount = RNG_ALGORITHM_COUNT;
}
return EFI_SUCCESS; return EFI_SUCCESS;
} }