[Bug libc/20829] crypt snprintf namespace

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https://sourceware.org/bugzilla/show_bug.cgi?id=20829

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=61158ffa9a17476d88aaf4a833d13b12f1c51387

commit 61158ffa9a17476d88aaf4a833d13b12f1c51387
Author: Joseph Myers <joseph@codesourcery.com>
Date:   Wed Nov 16 22:46:48 2016 +0000

    Fix crypt snprintf namespace (bug 20829).

    Extending linknamespace tests to cover libcrypt showed that crypt
    brings in references to snprintf, but is in XPG3 and XPG4 which don't
    have snprintf.  This patch fixes it to use __snprintf instead,
    exporting __snprintf from libc.so at version GLIBC_PRIVATE and adding
    libc_hidden_proto / libc_hidden_def accordingly.

    Tested for x86_64 and x86, in conjunction with the testsuite changes
    to enable linknamespace testing for libdl and libcrypt.  Also tested
    (compilation only) for powerpc to make sure there were no problem
    interactions with the optional-long-double handling for snprintf.

        [BZ #20829]
        * stdio-common/Versions (__snprintf): Add to version
        GLIBC_PRIVATE.
        * include/stdio.h (__snprintf): Use libc_hidden_proto.
        * stdio-common/snprintf.c (__snprintf): Use libc_hidden_def.
        * crypt/sha256-crypt.c (__sha256_crypt_r): Use __snprintf instead
        of snprintf.
        * crypt/sha512-crypt.c (__sha512_crypt_r): Likewise.

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

Summary of changes:
 ChangeLog               |   11 +++++++++++
 crypt/sha256-crypt.c    |    4 ++--
 crypt/sha512-crypt.c    |    4 ++--
 include/stdio.h         |    1 +
 stdio-common/Versions   |    2 ++
 stdio-common/snprintf.c |    1 +
 6 files changed, 19 insertions(+), 4 deletions(-)

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