From: "Sean Rhodes" <sean@starlabs.systems>
To: Benjamin Doron <benjamin.doron00@gmail.com>
Cc: devel@edk2.groups.io, Guo Dong <guo.dong@intel.com>,
Ray Ni <ray.ni@intel.com>, James Lu <james.lu@intel.com>,
Gua Guo <gua.guo@intel.com>
Subject: Re: [edk2-devel][PATCH v1 1/2] UefiPayloadPkg: Define RngLibTimerLib for systems without RDRAND
Date: Wed, 26 Apr 2023 13:33:01 +0100 [thread overview]
Message-ID: <CABtds-1NtKGMbEoZ3u40Fvi7kwW7s4oioDzYgUOZgKtS+MQW7A@mail.gmail.com> (raw)
In-Reply-To: <7edb8c7baae2fc58034a62f50f5f4000fb5bd102.1682442501.git.benjamin.doron00@gmail.com>
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Reviewed-by: Sean Rhodes <sean@starlabs.systems>
On Tue, 25 Apr 2023 at 18:09, Benjamin Doron <benjamin.doron00@gmail.com>
wrote:
> From: Benjamin Doron <benjamin.doron@9elements.com>
>
> Presently, `ArchIsRngSupported()` always returns TRUE, per
>
> https://github.com/tianocore/edk2/blob/1eeca0750af5af2f0e78437bf791ac2de74bde74/MdePkg/Library/BaseRngLib/Rand/RdRand.c#L124-L125
> .
> Therefore, `BaseRngLibConstructor()` should continue to assert RDRAND
> support.
>
> However, older platforms do not support RDRAND, such as QEMU in some
> configurations. Therefore, define an RngLib library class for such
> systems, using a new flag. Maintain current behaviour by default.
>
> Note that this is less secure behaviour, and should be avoided in
> production.
>
> Cc: Guo Dong <guo.dong@intel.com>
> Cc: Ray Ni <ray.ni@intel.com>
> Cc: Sean Rhodes <sean@starlabs.systems>
> Cc: James Lu <james.lu@intel.com>
> Cc: Gua Guo <gua.guo@intel.com>
> Signed-off-by: Benjamin Doron <benjamin.doron@9elements.com>
> ---
> UefiPayloadPkg/UefiPayloadPkg.dsc | 5 +++++
> 1 file changed, 5 insertions(+)
>
> diff --git a/UefiPayloadPkg/UefiPayloadPkg.dsc
> b/UefiPayloadPkg/UefiPayloadPkg.dsc
> index 9847f189fff5..1e803ba01567 100644
> --- a/UefiPayloadPkg/UefiPayloadPkg.dsc
> +++ b/UefiPayloadPkg/UefiPayloadPkg.dsc
> @@ -130,6 +130,7 @@
> # This is how BaseCpuTimerLib works, and a recommended way to get
> Frequence, so set the default value as TRUE.
> # Note: for emulation platform such as QEMU, this may not work and
> should set it as FALSE
> DEFINE CPU_TIMER_LIB_ENABLE = TRUE
> + DEFINE CPU_RNG_ENABLE = TRUE
>
> DEFINE MULTIPLE_DEBUG_PORT_SUPPORT = FALSE
>
> @@ -204,7 +205,11 @@
> !endif
> IntrinsicLib|CryptoPkg/Library/IntrinsicLib/IntrinsicLib.inf
> OpensslLib|CryptoPkg/Library/OpensslLib/OpensslLib.inf
> +!if $(CPU_RNG_ENABLE) == TRUE
> RngLib|MdePkg/Library/BaseRngLib/BaseRngLib.inf
> +!else
> + RngLib|MdePkg/Library/BaseRngLibTimerLib/BaseRngLibTimerLib.inf
> +!endif
> HobLib|UefiPayloadPkg/Library/DxeHobLib/DxeHobLib.inf
>
> #
> --
> 2.39.2
>
>
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prev parent reply other threads:[~2023-04-26 12:33 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-04-25 17:09 [edk2-devel][PATCH v1 1/2] UefiPayloadPkg: Define RngLibTimerLib for systems without RDRAND Benjamin Doron
2023-04-25 17:09 ` [edk2-devel][PATCH v1 2/2] UefiPayloadPkg: Enable RNG support Benjamin Doron
2023-04-26 12:33 ` Sean Rhodes
2023-04-26 12:55 ` Guo, Gua
2023-04-26 13:10 ` Sheng Lean Tan
2023-04-26 22:43 ` Guo, Gua
2023-04-26 13:09 ` [edk2-devel] [PATCH " Sheng Lean Tan
2023-04-26 18:07 ` [edk2-devel][PATCH " Pedro Falcato
2023-04-26 21:24 ` [edk2-devel] [PATCH " Benjamin Doron
2023-04-26 12:33 ` Sean Rhodes [this message]
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