Our Most Treacherous Adversary
summary
Upgrading to a new Clang build Clang upgrade triggers crash when a tiny function that returns "true" or "false" begins segfaulting with a trashed stack. The compiler replaces branches with a conditional move plus a math trick (length = 5 bool) so an uninitialized bool becomes nonzero* and yields a bad length, corrupting the small-string buffer. Recommendation: audit code for uninitialized booleans and avoid using bool in data structures that cross privilege or process boundaries.
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