Devin Teske
3baada83bf
connect(2) passes AT_FDCWD to unp_connectat(), so the empty-path descriptor branch added in6563dcb6b1turned any sockaddr whose sun_path begins with a NUL byte into getsock(AT_FDCWD), failing with EBADF where the pathname lookup historically failed with ENOENT. Linux abstract namespace names are exactly that: the linuxulator passes them through with the leading NUL intact, and libxcb tries the abstract socket first, falling back to the pathname socket only on ENOENT or ECONNREFUSED. The EBADF made every Linux X11 client fail at startup with "Missing X server or $DISPLAY". Restrict the descriptor interpretation to fd != AT_FDCWD, matching the contract stated in 6563dcb6b1f5's commit message ("Accept an empty sun_path when fd is not AT_FDCWD"): connect(2) again reaches the pathname lookup and fails with ENOENT as it always did. Add a regression test: a NUL-leading, nonzero-length sun_path through connect(2) or connectat(2) with AT_FDCWD must fail the pathname lookup with ENOENT, not EBADF. Fixes:6563dcb6b1("unix: allow connectat(2) to name the peer socket by descriptor") Reviewed by: John Ericson <[email protected]>, markj Differential Revision: https://reviews.freebsd.org/D58792
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