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backdoor in upstream xz/liblzma leading to ssh server compromise
(www.openwall.com)
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Time to bring back the reproducible build hype
Won't help here; this backdoor is entirely reproducible. That's one of the scary parts.
The backdoor wasn't in the source code, only in the distributed binary. So reproducible builds would have flagged the tar as not coming from what was in Git
Not exactly - it was in the source tarbal available for download from the releases page but not the git source tree.