From: "PierreGondois" <pierre.gondois@arm.com>
To: Kun Qin <kuqin12@gmail.com>, 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: Re: [edk2-devel] [PATCH v1 1/8] MdePkg/ArmTrngLib: Remove ASSERTs in Null implementation
Date: Fri, 30 Jun 2023 15:56:27 +0200 [thread overview]
Message-ID: <d430cd5a-895d-a56d-5425-9ffb14ebc780@arm.com> (raw)
In-Reply-To: <b998fc94-a7c9-6fff-be57-317e09d7dfce@gmail.com>
Hello Kun,
The reason was that:
- KvmTool uses the SecurityPkg/RandomNumberGenerator/RngDxe/RngDxe.inf module
- the RngDxe.inf modules requires an ArmTrng implementation
- GetArmTrngVersion() is called to check whether there is a Trng backend
- GetArmTrngVersion() asserts as it is a NULL implementation
but it seems the actual implementation of the ArmTrngLib could be used instead.
The returned error code is actually the same (UNSUPPORTED). I will check with
Sami if this is ok to do this instead.
Regards,
Pierre
On 6/29/23 22:34, Kun Qin wrote:
> Hi Pierre,
>
> Do we really need this removal of ASSERT? I tried to use the real
> ArmTrngLib with this patch
> and it seems to work fine with a TFA that does not support TRNG interfaces.
>
> I think it would be valuable to keep the ASSERT to indicate there might
> be an integration error?
>
> Please let me know if I missed anything.
>
> Regards,
> Kun
>
> On 5/9/2023 12:40 AM, PierreGondois wrote:
>> From: Pierre Gondois <pierre.gondois@arm.com>
>>
>> Remove ASSERTs to allow RngDxe probing the Null implementation
>> of the TrngLib.
>>
>> Signed-off-by: Pierre Gondois <pierre.gondois@arm.com>
>> ---
>> MdePkg/Library/BaseArmTrngLibNull/BaseArmTrngLibNull.c | 4 ----
>> 1 file changed, 4 deletions(-)
>>
>> diff --git a/MdePkg/Library/BaseArmTrngLibNull/BaseArmTrngLibNull.c b/MdePkg/Library/BaseArmTrngLibNull/BaseArmTrngLibNull.c
>> index 316d78bf5e83..0ea9aafa59f1 100644
>> --- a/MdePkg/Library/BaseArmTrngLibNull/BaseArmTrngLibNull.c
>> +++ b/MdePkg/Library/BaseArmTrngLibNull/BaseArmTrngLibNull.c
>> @@ -41,7 +41,6 @@ GetArmTrngVersion (
>> OUT UINT16 *MinorRevision
>> )
>> {
>> - ASSERT (FALSE);
>> return RETURN_UNSUPPORTED;
>> }
>>
>> @@ -67,7 +66,6 @@ GetArmTrngUuid (
>> OUT GUID *Guid
>> )
>> {
>> - ASSERT (FALSE);
>> return RETURN_UNSUPPORTED;
>> }
>>
>> @@ -83,7 +81,6 @@ GetArmTrngMaxSupportedEntropyBits (
>> VOID
>> )
>> {
>> - ASSERT (FALSE);
>> return 0;
>> }
>>
>> @@ -116,6 +113,5 @@ GetArmTrngEntropy (
>> OUT UINT8 *Buffer
>> )
>> {
>> - ASSERT (FALSE);
>> return RETURN_UNSUPPORTED;
>> }
next prev parent reply other threads:[~2023-06-30 13:56 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 [this message]
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 ` [PATCH v1 3/8] MdePkg/DxeRngLib: Request raw algorithm instead of default PierreGondois
2023-06-29 10:24 ` 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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