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XZ backdoor in a nutshell
(lemmy.zip)
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this post was submitted on 01 Apr 2024
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For any given tag, GitHub will always have an autogenerated "archive/" link, but the "release/" link is a set of maintainer-uploaded blobs. In this situation, those are the compromised ones. Any distro pulling from an "archive/" link would be unaffected, but I don't know of any doing that.
The problem with the "archive/" links is that GitHub reserves the right to change them. They're promising to give notice, but it's just not a good situation. The "release/" links are only going to change if the maintainer tries something funny, so the distro's usual mechanisms to check the hashes normally suffice.
NixOS 23.11 is indeed not affected.
cache.nixos.org keeps all sources so once hydra has ingested something it's not going away unless nixos maintainers want it to. The policy for decades was simply "keep all derivations" but in the interest of space savings it has recently been decided to do a gc run, meaning that 22 year old derivations will still available but you're going to have to build them from the cached source, the pre-built artifacts will be gone.