[Bug dynamic-link/20890] ldconfig: fsync the files before atomic rename

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https://sourceware.org/bugzilla/show_bug.cgi?id=20890

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=999a6dab3ee1c8e77bb348ba2389e7aeb5c062b2

commit 999a6dab3ee1c8e77bb348ba2389e7aeb5c062b2
Author: Florian Weimer <fweimer@redhat.com>
Date:   Wed Feb 21 10:42:48 2018 +0100

    ldconfig: Sync temporary files to disk before renaming them [BZ #20890]

    If the system crashes before the file data has been written to disk, the
    file system recovery upon the next mount may restore a partially
    rewritten temporary file under the non-temporary (final) name (after the
    rename operation).

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Summary of changes:
 ChangeLog   |    8 ++++++++
 elf/cache.c |   10 +++++++---
 2 files changed, 15 insertions(+), 3 deletions(-)

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