[llvm-bugs] [Bug 30346] New: REGRESSION: clang-3.8+ do not work well with _FORTIFY_SOURCE and struct socket with addresses > 14 bytes

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=30346

            Bug ID: 30346
           Summary: REGRESSION: clang-3.8+ do not work well with
                    _FORTIFY_SOURCE and struct socket with addresses > 14
                    bytes
           Product: clang
           Version: 3.8
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: -New Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: jeremyhu at apple.com
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

Created attachment 17237
  --> https://llvm.org/bugs/attachment.cgi?id=17237&action=edit
reproduction test case

If _FORTIFY_SOURCE is on, strncpy() will abort incorrectly when dealing with a
`sa_data` field in `struct sockaddr` that is larger than 14 bytes.  clang
incorrectly determines the size of the field to be statically 14.

This was noticed in X11 with the logic in libxtrans.  I've prepared a
simplified test case.

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