From: "PierreGondois" <pierre.gondois@arm.com>
To: devel@edk2.groups.io
Cc: Michael D Kinney <michael.d.kinney@intel.com>,
Liming Gao <gaoliming@byosoft.com.cn>,
Zhiguang Liu <zhiguang.liu@intel.com>,
Jiewen Yao <jiewen.yao@intel.com>,
Jian J Wang <jian.j.wang@intel.com>,
Ard Biesheuvel <ardb+tianocore@kernel.org>,
Sami Mujawar <sami.mujawar@arm.com>,
Jose Marinho <Jose.Marinho@arm.com>,
Samer El-Haj-Mahmoud <Samer.El-Haj-Mahmoud@arm.com>
Subject: [PATCH v1 3/8] MdePkg/DxeRngLib: Request raw algorithm instead of default
Date: Tue, 9 May 2023 09:40:37 +0200 [thread overview]
Message-ID: <20230509074042.1523428-4-pierre.gondois@arm.com> (raw)
In-Reply-To: <20230509074042.1523428-1-pierre.gondois@arm.com>
From: Pierre Gondois <pierre.gondois@arm.com>
The DxeRngLib tries to generate a random number using the 3 NIST
SP 800-90 compliant DRBG algorithms, i.e. 256-bits CTR, HASH and HMAC.
If none of the call is successful, the fallback option is the default
RNG algorithm of the EFI_RNG_PROTOCOL. This default algorithm might
be an unsafe implementation.
Try requesting the Raw algorithm before requesting the default one.
Signed-off-by: Pierre Gondois <pierre.gondois@arm.com>
---
MdePkg/Library/DxeRngLib/DxeRngLib.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/MdePkg/Library/DxeRngLib/DxeRngLib.c b/MdePkg/Library/DxeRngLib/DxeRngLib.c
index 46aea515924f..a01b66ad7d20 100644
--- a/MdePkg/Library/DxeRngLib/DxeRngLib.c
+++ b/MdePkg/Library/DxeRngLib/DxeRngLib.c
@@ -65,9 +65,15 @@ GenerateRandomNumberViaNist800Algorithm (
return Status;
}
+ Status = RngProtocol->GetRNG (RngProtocol, &gEfiRngAlgorithmRaw, BufferSize, Buffer);
+ DEBUG ((DEBUG_INFO, "%a: GetRNG algorithm Raw - Status = %r\n", __func__, Status));
+ if (!EFI_ERROR (Status)) {
+ return Status;
+ }
+
// If all the other methods have failed, use the default method from the RngProtocol
Status = RngProtocol->GetRNG (RngProtocol, NULL, BufferSize, Buffer);
- DEBUG ((DEBUG_INFO, "%a: GetRNG algorithm Hash-256 - Status = %r\n", __func__, Status));
+ DEBUG ((DEBUG_INFO, "%a: GetRNG algorithm default - Status = %r\n", __func__, Status));
if (!EFI_ERROR (Status)) {
return Status;
}
--
2.25.1
next prev parent reply other threads:[~2023-05-09 7:42 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-05-09 7:40 [PATCH v1 0/8] SecurityPkg/MdePkg: RngLib GUID PierreGondois
2023-05-09 7:40 ` [PATCH v1 1/8] MdePkg/ArmTrngLib: Remove ASSERTs in Null implementation PierreGondois
2023-06-29 10:23 ` Sami Mujawar
2023-06-29 20:34 ` [edk2-devel] " Kun Qin
2023-06-30 13:56 ` PierreGondois
2023-05-09 7:40 ` [PATCH v1 2/8] MdePkg/MdePkg.dec: Move PcdCpuRngSupportedAlgorithm to MdePkg PierreGondois
2023-06-29 10:23 ` Sami Mujawar
2023-06-29 20:36 ` [edk2-devel] " Kun Qin
2023-06-30 14:30 ` PierreGondois
2023-06-30 17:00 ` Kun Qin
2023-05-09 7:40 ` PierreGondois [this message]
2023-06-29 10:24 ` [PATCH v1 3/8] MdePkg/DxeRngLib: Request raw algorithm instead of default Sami Mujawar
2023-05-09 7:40 ` [PATCH v1 4/8] MdePkg/Rng: Add GUIDs to describe Rng algorithms PierreGondois
2023-05-09 13:45 ` Yao, Jiewen
2023-05-09 13:50 ` Samer El-Haj-Mahmoud
2023-05-09 13:55 ` Yao, Jiewen
2023-06-06 16:09 ` PierreGondois
2023-06-29 10:24 ` Sami Mujawar
2023-05-09 7:40 ` [PATCH v1 5/8] MdePkg/Rng: Add GetRngGuid() to RngLib PierreGondois
2023-06-29 10:27 ` Sami Mujawar
2023-05-09 7:40 ` [PATCH v1 6/8] SecurityPkg/RngDxe: Use GetRngGuid() when probing RngLib PierreGondois
2023-06-29 10:28 ` Sami Mujawar
2023-05-09 7:40 ` [PATCH v1 7/8] SecurityPkg/RngDxe: Select safe default Rng algorithm PierreGondois
2023-06-29 10:28 ` Sami Mujawar
2023-06-29 23:07 ` [edk2-devel] " Kun Qin
2023-06-30 7:22 ` Sami Mujawar
2023-05-09 7:40 ` [PATCH v1 8/8] SecurityPkg/RngDxe: Simplify Rng algorithm selection for Arm PierreGondois
2023-06-29 10:28 ` Sami Mujawar
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