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authoriximeow <me@iximeow.net>2023-12-16 13:26:48 -0800
committeriximeow <me@iximeow.net>2023-12-16 13:26:48 -0800
commit110f797005cca70e18cbcc0975397d26d8045245 (patch)
treea3ff79c0c3a7519d00e19d213447c268614cef00 /test/protected_mode/regspec.rs
parent85668b222582ef1edae537beea452d5e1c933389 (diff)
fix opportunity for unhandled register synonyms
registers `al`, `cl`, `dl`, and `bl` could have two different representations - with `rex.w` and without. these two forms of `RegSpec` would not compare equal, nor has the same, so for code relying on `RegSpec` to faithfully represent a 1-1 mapping to x86 registers, these synonyms would introduce bugs in register analysis. for example, in `yaxpeax-core`, this would result in instructions writing to `rex.w al` not being visible as definitions for a future read of `!rex.w al`. fix this in `x86_64` code, add new test cases about the confusion, adjust register names to make this situation more clearly a bug, and introduce two new fuzz targets that would have helped spot this error.
Diffstat (limited to 'test/protected_mode/regspec.rs')
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