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ArmVirtPkg: Resolve RngLib via RngDxe for TRNG support 

Gerd reports that ArmVirtQemu running under KVM lost network boot
support on systems that do not implement the RNDR/RNDRRS system
registers, which provide an architectural, CPU-based source of random
numbers. Under KVM, the TRNG SMCCC is available as a fallback, which is
exposed via RngDxe but not via the base RngLib library. This means that
direct users of RngLib, such as OpensslLib, have no access to the TRNG
based entropy source.

Let's fix this by resolving RngLib dependencies for UEFI_DRIVER type
drivers via DxeRngLib, which uses the protocol exposed by RngDxe
internally.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
This commit is contained in:
Ard Biesheuvel 2024-09-03 09:58:49 +02:00 committed by mergify[bot]
parent 8504d2be17
commit afba5358c8
1 changed files with 4 additions and 0 deletions
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4
ArmVirtPkg/ArmVirt.dsc.inc
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@ -232,6 +232,10 @@
DebugLib|ArmVirtPkg/Library/DebugLibFdtPL011Uart/DebugLibFdtPL011UartFlash.inf
!endif
[LibraryClasses.common.UEFI_DRIVER]
# resolve RngLib via RngDxe's EFI_RNG_PROTOCOL for UEFI_DRIVER type drivers such as TlsDxe
RngLib|MdePkg/Library/DxeRngLib/DxeRngLib.inf
[LibraryClasses.common.DXE_CORE]
HobLib|MdePkg/Library/DxeCoreHobLib/DxeCoreHobLib.inf
MemoryAllocationLib|MdeModulePkg/Library/DxeCoreMemoryAllocationLib/DxeCoreMemoryAllocationLib.inf