Re: 回复: [edk2-devel] [PATCH v1 0/8] SecurityPkg/MdePkg: RngLib GUID

[PierreGondois]

+ Rebecca

Hello Liming,
PcdCpuRngSupportedAlgorithm is currently not set by any platform in the edk2 or edk2-platforms repository.
It was first introduced by Rebecca in:
commit 4e5ecdbac8bd ("SecurityPkg: Add support for RngDxe on AARCH64")

Except if Rebecca sees an issue in this change, I think this is ok.

Regards,
Pierre

On 6/25/23 05:13, gaoliming wrote:
> Pierre:
>    This patch set moves PCD from gEfiSecurityPkgTokenSpaceGuid.PcdCpuRngSupportedAlgorithm to MdePkg. It may impact the platform those set this PCD in their DSC. Have you evaluated its impact?
> 
> Thanks
> Liming
>> -----邮件原件-----
>> 发件人: Pierre Gondois <pierre.gondois at arm.com>
>> 发送时间: 2023年6月23日 17:02
>> 收件人: devel at edk2.groups.io
>> 抄送: Michael D Kinney <michael.d.kinney at intel.com>; Liming Gao
>> <gaoliming at byosoft.com.cn>; Zhiguang Liu <zhiguang.liu at intel.com>; Jiewen
>> Yao <jiewen.yao at intel.com>; Jian J Wang <jian.j.wang at intel.com>; Ard
>> Biesheuvel <ardb+tianocore at kernel.org>; Sami Mujawar
>> <sami.mujawar at arm.com>; Jose Marinho <Jose.Marinho at arm.com>; Samer
>> El-Haj-Mahmoud <Samer.El-Haj-Mahmoud at arm.com>
>> 主题: Re: [edk2-devel] [PATCH v1 0/8] SecurityPkg/MdePkg: RngLib GUID
>>
>> Hello,
>> Just a ping for the patch-set,
>>
>> Regards,
>> Pierre
>>
>> On 5/9/23 09:40, PierreGondois via groups.io wrote:
>>> From: Pierre Gondois <pierre.gondois at arm.com>
>>>
>>> This patchset follows the 'code first' approach and relies on [1].
>>> This patchset follows the thread at [3] that aims to solve [2].
>>> [1] and [2] are bound and this patchset aims to solve both.
>>>
>>> In this patchset:
>>> a-
>>> The RngDxe can rely on the RngLib. However the RngLib has no
>>> interface allowing to describe which Rng algorithm is implemented.
>>> The RngDxe must advertise the algorithm that are available through
>>> the RngGetInfo() callback.
>>> Add a GetRngGuid() for interface to the RngLib.
>>>
>>> b-
>>> The Arm Architecture states the RNDR that the DRBG algorithm should
>>> be compliant with NIST SP800-90A, while not mandating a particular
>>> algorithm, so as to be inclusive of different geographies.
>>> The RngLib can rely on this Arm RNDR instruction. In order to
>>> accurately describe the implementation using the RNDR instruction,
>>> add a EFI_RNG_ALGORITHM_ARM_RNDR GUID [1].
>>>
>>> c-
>>> For the same reason as a/b, add a GUID describing unsafe RNG
>>> algorithms, allowing to accurately describe the BaseRngLibTimerLib.
>>>
>>> d-
>>> Use a/b/c mechanisms/GUIDs to select a safe Rng algorithm in the
>>> Arm implementation of the RngDxe.
>>>
>>> [1] BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=4441
>>> [2] BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=4151
>>> [3] https://edk2.groups.io/g/devel/message/100806
>>>
>>> Pierre Gondois (8):
>>>     MdePkg/ArmTrngLib: Remove ASSERTs in Null implementation
>>>     MdePkg/MdePkg.dec: Move PcdCpuRngSupportedAlgorithm to MdePkg
>>>     MdePkg/DxeRngLib: Request raw algorithm instead of default
>>>     MdePkg/Rng: Add GUIDs to describe Rng algorithms
>>>     MdePkg/Rng: Add GetRngGuid() to RngLib
>>>     SecurityPkg/RngDxe: Use GetRngGuid() when probing RngLib
>>>     SecurityPkg/RngDxe: Select safe default Rng algorithm
>>>     SecurityPkg/RngDxe: Simplify Rng algorithm selection for Arm
>>>
>>>    MdePkg/Include/Library/RngLib.h               | 17 +++++
>>>    MdePkg/Include/Protocol/Rng.h                 | 20 ++++++
>>>    .../BaseArmTrngLibNull/BaseArmTrngLibNull.c   |  4 --
>>>    MdePkg/Library/BaseRngLib/AArch64/Rndr.c      | 42 +++++++++++
>>>    MdePkg/Library/BaseRngLib/BaseRngLib.inf      |  9 +++
>>>    MdePkg/Library/BaseRngLib/Rand/RdRand.c       | 26 +++++++
>>>    .../Library/BaseRngLibNull/BaseRngLibNull.c   | 22 ++++++
>>>    .../BaseRngLibTimerLib/BaseRngLibTimerLib.inf |  3 +
>>>    .../Library/BaseRngLibTimerLib/RngLibTimer.c  | 28 ++++++++
>>>    MdePkg/Library/DxeRngLib/DxeRngLib.c          | 36 +++++++++-
>>>    MdePkg/MdePkg.dec                             |  7 ++
>>>    .../RngDxe/AArch64/AArch64Algo.c              | 70
>> +++++++++++++++----
>>>    .../RandomNumberGenerator/RngDxe/ArmRngDxe.c  | 23 +++---
>>>    .../RandomNumberGenerator/RngDxe/RngDxe.inf   |  5 +-
>>>    SecurityPkg/SecurityPkg.dec                   |  2 -
>>>    15 files changed, 278 insertions(+), 36 deletions(-)
>>>
> 
> 


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