libXdmcp: Changes to 'master'

[Peter Hutterer]

 Key.c        |   31 ++++++++++++++++++++++++++-----
 configure.ac |    2 +-
 2 files changed, 27 insertions(+), 6 deletions(-)

New commits:
commit 0554324ec6bbc2071f5d1f8ad211a1643e29eb1f
Author: Benjamin Tissoires <benjamin.tissoires at gmail.com>
Date:   Tue Apr 4 19:13:38 2017 +0200

    Use getentropy() if arc4random_buf() is not available
    
    This allows to fix CVE-2017-2625 on Linux platforms without pulling in
    libbsd.
    The libc getentropy() is available since glibc 2.25 but also on OpenBSD.
    For Linux, we need at least a v3.17 kernel. If the recommended
    arc4random_buf() function is not available, emulate it by first trying
    to use getentropy() on a supported glibc and kernel. If the call fails,
    fall back to the current (vulnerable) code.
    
    Signed-off-by: Benjamin Tissoires <benjamin.tissoires at gmail.com>
    Reviewed-by: Mark Kettenis <kettenis at openbsd.org>
    Reviewed-by: Alan Coopersmith <alan.coopersmith at oracle.com>
    Signed-off-by: Peter Hutterer <peter.hutterer at who-t.net>