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67 lines
2.5 KiB
67 lines
2.5 KiB
5 months ago
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From 3351bd0ba07cc490c344d2dc54b86833993ca5a2 Mon Sep 17 00:00:00 2001
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From: Jon Maloy <jmaloy@redhat.com>
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Date: Thu, 20 Jun 2024 15:58:58 -0400
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Subject: [PATCH 18/31] MdePkg/DxeRngLib: Request raw algorithm instead of
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default
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RH-Author: Jon Maloy <jmaloy@redhat.com>
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RH-MergeRequest: 77: UINT32 overflow in S3 ResumeCount and Pixiefail fixes
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RH-Jira: RHEL-21854 RHEL-21856 RHEL-40099
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RH-Acked-by: Gerd Hoffmann <None>
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RH-Commit: [18/31] fa2da700127ae713aa578638c2390673fc49522d
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JIRA: https://issues.redhat.com/browse/RHEL-21856
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Upstream: Merged
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CVE: CVE-2023-45237
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commit bd1f0eecc1dfe51ba20161bef8860d12392006bd
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Author: Pierre Gondois <pierre.gondois@arm.com>
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Date: Fri Aug 11 16:33:05 2023 +0200
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MdePkg/DxeRngLib: Request raw algorithm instead of default
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The DxeRngLib tries to generate a random number using the 3 NIST
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SP 800-90 compliant DRBG algorithms, i.e. 256-bits CTR, HASH and HMAC.
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If none of the call is successful, the fallback option is the default
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RNG algorithm of the EFI_RNG_PROTOCOL. This default algorithm might
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be an unsafe implementation.
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Try requesting the Raw algorithm before requesting the default one.
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Signed-off-by: Pierre Gondois <pierre.gondois@arm.com>
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Reviewed-by: Sami Mujawar <sami.mujawar@arm.com>
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Reviewed-by: Liming Gao <gaoliming@byosoft.com.cn>
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Acked-by: Ard Biesheuvel <ardb@kernel.org>
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Tested-by: Kun Qin <kun.qin@microsoft.com>
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Signed-off-by: Jon Maloy <jmaloy@redhat.com>
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---
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MdePkg/Library/DxeRngLib/DxeRngLib.c | 9 ++++++++-
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1 file changed, 8 insertions(+), 1 deletion(-)
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diff --git a/MdePkg/Library/DxeRngLib/DxeRngLib.c b/MdePkg/Library/DxeRngLib/DxeRngLib.c
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index 9c3d67b5a6..4b2fc1cde5 100644
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--- a/MdePkg/Library/DxeRngLib/DxeRngLib.c
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+++ b/MdePkg/Library/DxeRngLib/DxeRngLib.c
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@@ -64,9 +64,16 @@ GenerateRandomNumberViaNist800Algorithm (
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if (!EFI_ERROR (Status)) {
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return Status;
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}
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+
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+ Status = RngProtocol->GetRNG (RngProtocol, &gEfiRngAlgorithmRaw, BufferSize, Buffer);
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+ DEBUG ((DEBUG_INFO, "%a: GetRNG algorithm Raw - Status = %r\n", __func__, Status));
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+ if (!EFI_ERROR (Status)) {
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+ return Status;
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+ }
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+
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// If all the other methods have failed, use the default method from the RngProtocol
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Status = RngProtocol->GetRNG (RngProtocol, NULL, BufferSize, Buffer);
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- DEBUG((DEBUG_INFO, "%a: GetRNG algorithm Hash-256 - Status = %r\n", __FUNCTION__, Status));
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+ DEBUG ((DEBUG_INFO, "%a: GetRNG algorithm default - Status = %r\n", __func__, Status));
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if (!EFI_ERROR (Status)) {
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return Status;
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}
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--
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2.39.3
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