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MdeModulePkg/Rng: Add GUID to describe unsafe Rng algorithms 

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.gondois@arm.com>
Reviewed-by: Sami Mujawar <sami.mujawar@arm.com>
Acked-by: Ard Biesheuvel <ardb@kernel.org>
Tested-by: Kun Qin <kun.qin@microsoft.com>
This commit is contained in:
Pierre Gondois 2023-08-11 16:33:07 +02:00 committed by mergify[bot]
parent cf07238e5f
commit 414c0f2089
2 changed files with 26 additions and 0 deletions
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23
MdeModulePkg/Include/Guid/RngAlgorithm.h Normal file
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@ -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_

3
MdeModulePkg/MdeModulePkg.dec
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@ -418,6 +418,9 @@
## 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
#