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by caf 4873 days ago
Being "invalid" doesn't nullify the backwards-compatibility rule - if the kernel accepts a certain kind of invalid ELF file, and people have come to rely on it doing so, then that has become a de facto part of the ABI. "But userspace is buggy!" is not considered a valid excuse.

What does nullify the backwards-compatibility rule is no-one noticing or caring that it has changed.