[compiler-rt] -fsanitize=alignment: check memcpy/memmove arguments (PR #67766)

Nikita Popov via llvm-commits llvm-commits at lists.llvm.org
Mon Oct 2 13:19:45 PDT 2023


nikic wrote:

@zygoloid Thanks for the explanation! I wasn't aware this fell under unspecified behavior. It's weird that alignment information can survive a `void *` cast, but it does make some sense.

What seems worrying here is that apparently GCC and Clang do not agree on semantics in this case (https://godbolt.org/z/1r9df5a4a). GCC does not assume that the pointers are aligned. The perils of unspecified behavior....

https://github.com/llvm/llvm-project/pull/67766


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