[Bug build/22446] aliasing violation calling readlink in handle_request

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https://sourceware.org/bugzilla/show_bug.cgi?id=22446

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=49b036bce9f021ae994a85aee8b410d20b29c8b7

commit 49b036bce9f021ae994a85aee8b410d20b29c8b7
Author: Joseph Myers <joseph@codesourcery.com>
Date:   Mon Dec 18 18:50:40 2017 +0000

    Fix nscd readlink argument aliasing (bug 22446).

    Current GCC mainline detects that nscd calls readlink with the same
    buffer for both input and output, which is not valid (those arguments
    are both restrict-qualified in POSIX).  This patch makes it use a
    separate buffer for readlink's input (with a size that is sufficient
    to avoid truncation, so there should be no problems with warnings
    about possible truncation, though not strictly minimal, but much
    smaller than the buffer for output) to avoid this problem.

    Tested compilation for aarch64-linux-gnu with build-many-glibcs.py.

        [BZ #22446]
        * nscd/connections.c (handle_request) [SO_PEERCRED]: Use separate
        buffers for readlink input and output.

-----------------------------------------------------------------------

Summary of changes:
 ChangeLog          |    6 ++++++
 nscd/connections.c |    5 +++--
 2 files changed, 9 insertions(+), 2 deletions(-)

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