[Bug nscd/16759] getnetgrent_r returns blank strings instead of NULL with nscd enabled

["cvs-commit at gcc dot gnu.org" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=16759

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=dd3022d75e6fb8957843d6d84257a5d8457822d5

commit dd3022d75e6fb8957843d6d84257a5d8457822d5
Author: Siddhesh Poyarekar <siddhesh@redhat.com>
Date:   Thu Mar 27 19:49:51 2014 +0530

    Return NULL for wildcard values in getnetgrent from nscd (BZ #16759)

    getnetgrent is supposed to return NULL for values that are wildcards
    in the (host, user, domain) triplet.  This works correctly with nscd
    disabled, but with it enabled, it returns a blank ("") instead of a
    NULL.  This is easily seen with the output of `getent netgroup foonet`
    for a netgroup foonet defined as follows in /etc/netgroup:

        foonet (,foo,)

    The output with nscd disabled is:

        foonet ( ,foo,)

    while with nscd enabled, it is:

        foonet (,foo,)

    The extra space with nscd disabled is due to the fact that `getent
    netgroup` adds it if the return value from getnetgrent is NULL for
    either host or user.

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=ea7d8b95e2fcb81f68b04ed7787a3dbda023991a

commit ea7d8b95e2fcb81f68b04ed7787a3dbda023991a
Author: Siddhesh Poyarekar <siddhesh@redhat.com>
Date:   Thu Mar 27 19:48:15 2014 +0530

    Avoid overlapping addresses to stpcpy calls in nscd (BZ #16760)

    Calls to stpcpy from nscd netgroups code will have overlapping source
    and destination when all three values in the returned triplet are
    non-NULL and in the expected (host,user,domain) order.  This is seen
    in valgrind as:

    ==3181== Source and destination overlap in stpcpy(0x19973b48, 0x19973b48)
    ==3181==    at 0x4C2F30A: stpcpy (in
/usr/lib64/valgrind/vgpreload_memcheck-amd64-linux.so)
    ==3181==    by 0x12567A: addgetnetgrentX (string3.h:111)
    ==3181==    by 0x12722D: addgetnetgrent (netgroupcache.c:665)
    ==3181==    by 0x11114C: nscd_run_worker (connections.c:1338)
    ==3181==    by 0x4E3C102: start_thread (pthread_create.c:309)
    ==3181==    by 0x59B81AC: clone (clone.S:111)
    ==3181==

    Fix this by using memmove instead of stpcpy.

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

Summary of changes:
 ChangeLog            |   10 ++++++++++
 NEWS                 |    3 ++-
 inet/getnetgrent_r.c |   14 +++++++++++---
 nscd/netgroupcache.c |   16 ++++++++++------
 4 files changed, 33 insertions(+), 10 deletions(-)

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