From: Pierre Gondois <pierre.gond...@arm.com>
BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=4441
The EFI_RNG_PROTOCOL can rely on the RngLib. The RngLib has multiple
implementations, some of them are unsafe (e.g. BaseRngLibTimerLib).
To allow the RngDxe to detect when such implementation is used,
a GetRngGuid() function is added in a following patch.
Prepare GetRngGuid() return values and add a gEdkiiRngAlgorithmUnSafe
to describe an unsafe implementation, cf. the BaseRngLibTimerLib.
Signed-off-by: Pierre Gondois <pierre.gond...@arm.com>
---
MdeModulePkg/Include/Guid/RngAlgorithm.h | 23 +++++++++++++++++++++++
MdeModulePkg/MdeModulePkg.dec | 3 +++
2 files changed, 26 insertions(+)
create mode 100644 MdeModulePkg/Include/Guid/RngAlgorithm.h
diff --git a/MdeModulePkg/Include/Guid/RngAlgorithm.h
b/MdeModulePkg/Include/Guid/RngAlgorithm.h
new file mode 100644
index 000000000000..e2ac2ba3e5c6
--- /dev/null
+++ b/MdeModulePkg/Include/Guid/RngAlgorithm.h
@@ -0,0 +1,23 @@
+/** @file
+ Rng Algorithm
+
+ Copyright (c) 2023, Arm Limited. All rights reserved.<BR>
+ SPDX-License-Identifier: BSD-2-Clause-Patent
+**/
+
+#ifndef RNG_ALGORITHM_GUID_H_
+#define RNG_ALGORITHM_GUID_H_
+
+///
+/// The implementation of a Random Number Generator might be unsafe, when using
+/// a dummy implementation for instance. Allow identifying such implementation
+/// with this GUID.
+///
+#define EDKII_RNG_ALGORITHM_UNSAFE \
+ { \
+ 0x869f728c, 0x409d, 0x4ab4, {0xac, 0x03, 0x71, 0xd3, 0x09, 0xc1, 0xb3,
0xf4 } \
+ }
+
+extern EFI_GUID gEdkiiRngAlgorithmUnSafe;
+
+#endif // #ifndef RNG_ALGORITHM_GUID_H_
diff --git a/MdeModulePkg/MdeModulePkg.dec b/MdeModulePkg/MdeModulePkg.dec
index d65dae18aa81..55617c3f9bd2 100644
--- a/MdeModulePkg/MdeModulePkg.dec
+++ b/MdeModulePkg/MdeModulePkg.dec
@@ -418,6 +418,9 @@ [Guids]
## Include/Guid/MigratedFvInfo.h
gEdkiiMigratedFvInfoGuid = { 0xc1ab12f7, 0x74aa, 0x408d, { 0xa2, 0xf4, 0xc6,
0xce, 0xfd, 0x17, 0x98, 0x71 } }
+ ## Include/Guid/RngAlgorithm.h
+ gEdkiiRngAlgorithmUnSafe = { 0x869f728c, 0x409d, 0x4ab4, {0xac, 0x03, 0x71,
0xd3, 0x09, 0xc1, 0xb3, 0xf4 }}
+
#
# GUID defined in UniversalPayload
#
--
2.25.1
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