[Bug nss/22078] nss_files performance issue in multi mode

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https://sourceware.org/bugzilla/show_bug.cgi?id=22078

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=d8425e116cdd954fea0c04c0f406179b5daebbb3

commit d8425e116cdd954fea0c04c0f406179b5daebbb3
Author: Florian Weimer <fweimer@redhat.com>
Date:   Wed Oct 11 07:07:51 2017 +0200

    nss_files: Avoid large buffers with many host addresses [BZ #22078]

    The previous implementation had at least a quadratic space
    requirement in the number of host addresses and aliases.

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

Summary of changes:
 ChangeLog                       |   10 ++
 nss/Makefile                    |    2 +
 nss/nss_files/files-hosts.c     |  225 +++++++++++++++-----------
 nss/tst-nss-files-hosts-multi.c |  331 +++++++++++++++++++++++++++++++++++++++
 4 files changed, 472 insertions(+), 96 deletions(-)
 create mode 100644 nss/tst-nss-files-hosts-multi.c

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