On Sat, Aug 10, 2024 at 10:08:20AM GMT, Mike Beaton wrote: > The network boot stack fails to load in OVMF after > 4c4ceb2ceb80c42fd5545b2a4bd80321f07f4345 (NetworkPkg: SECURITY PATCH > CVE-2023-45237): https://bugzilla.tianocore.org/show_bug.cgi?id=4827 > > I have now understood that this is because the network stack drivers > have been updated to require an instance of gEfiRngProtocolGuid, so > OVMF now requires the `-device virtio-rng-pci` qemu option in order > for the network stack to load (this flag is required in order for > VirtioRngDxe to be able to provide the required protocol).
FYI: With the upcoming 2024-08 stable tag this will be relaxed, a CPU with rdrand instruction support will work too as source for random numbers. See https://github.com/tianocore/edk2/pull/5714 for details. > 1. This is rather non-obvious - previously, the user set the > compilation options for the network stack, and the network stack > started. Ideally, perhaps, this would be fixed by adding some > documentation somewhere easily found, but I am not sure where. (By the > way, we don't get any helpful asserts which would lead us in the right > direction; the depex is never satisfied, so the network stack drivers > just never load.) Yep. When it comes to diagnostics there is clearly room for improvement. > 2. I also spotted that OvmfXen has neither RngDxe nor VirtioRngDxe - I > have never used OvmfXen, so I am not sure about this but (since these > seem to be the only two drivers which produce gEfiRngProtocolGuid) at > least at first glance it looks as if OvmfXen won't have any RNG for > the network stack now, so that it's network stack would not start? There is a patch for that too in master branch, so upcoming 2024-08 should be fine here. It has been somewhat bumpy road due to the last minute merge of the fixes so some fallout has been fixed only after the 2024-05 stable tag. HTH & take care, Gerd -=-=-=-=-=-=-=-=-=-=-=- Groups.io Links: You receive all messages sent to this group. View/Reply Online (#120387): https://edk2.groups.io/g/devel/message/120387 Mute This Topic: https://groups.io/mt/107822587/21656 Group Owner: devel+ow...@edk2.groups.io Unsubscribe: https://edk2.groups.io/g/devel/unsub [arch...@mail-archive.com] -=-=-=-=-=-=-=-=-=-=-=-
