shim 15.8 for opsi

[uibmz]

Confirm the following are included in your repo, checking each box:

• completed README.md file with the necessary information
• shim.efi to be signed
• public portion of your certificate(s) embedded in shim (the file passed to VENDOR_CERT_FILE)
• binaries, for which hashes are added to vendor_db ( if you use vendor_db and have hashes allow-listed )
• any extra patches to shim via your own git tree or as files
• any extra patches to grub via your own git tree or as files
• build logs
• a Dockerfile to reproduce the build of the provided shim EFI binaries

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What is the link to your tag in a repo cloned from rhboot/shim-review?

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https://github.com/opsi-org/shim-review/releases/tag/opsi-shim-x86_64-20240618

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What is the SHA256 hash of your final SHIM binary?

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9c447ae6ee1010eb19645c9479cb47c35eb4afab8b3b36eda586112c1a68c19e

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What is the link to your previous shim review request (if any, otherwise N/A)?

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#360
#245
#29

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If no security contacts have changed since verification, what is the link to your request, where they've been verified (if any, otherwise N/A)?

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Security contacts haven't changed
#245

[THS-on]

We generally only accept minimal patches (such as adding more revocations), so let us know once rhboot/shim#666 makes it upstream or gets reviewed by one of the shim developers.

[steve-mcintyre]

@vathpela could you take a look at the patches here please? (rhboot/shim#666)

[dbnicholson]

@vathpela could you take a look at the patches here please? (rhboot/shim#666)

I'm obviously not @vathpela, but I did take a look at the patch. I don't know if that's really the best way to handle the problem, but it's addressing a real bug in shim. Currently if you try to load a non-existent second stage from disk, you get EFI_NOT_FOUND and shim automatically tries to load the default second stage (grub). However, if you try fetch a non-existent second stage from a server, you'll get a different error and shim won't try the default second stage.

Since shim is already setup to try the default second stage and it still goes through all the same verification, I don't think there's any harm also trying it when a network server returns an error trying to fetch the specified second stage. The patch has been there for 3 months and received no response.

[steve-mcintyre]

@vathpela patch review please?