[Bug libc/17273] getmntent() returns wrong default value for fs_passno

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https://sourceware.org/bugzilla/show_bug.cgi?id=17273

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=f2cdbadd8a078482d3b9fc2b59e888c64cc4efae

commit f2cdbadd8a078482d3b9fc2b59e888c64cc4efae
Author: Mike Frysinger <vapier@gentoo.org>
Date:   Fri Aug 28 17:08:49 2015 -0400

    getmntent: fix memory corruption w/blank lines [BZ #18887]

    The fix for BZ #17273 introduced a single byte of memory corruption when
    the line is entirely blank.  It would walk back past the start of the
    buffer if the heap happened to be 0x20 or 0x09 and then write a NUL byte.
        buffer = '\n';
        end_ptr = buffer;
        while (end_ptr[-1] == ' ' || end_ptr[-1] == '\t')
                end_ptr--;
        *end_ptr = '\0';

    Fix that and rework the tests.  Adding the testcase for BZ #17273 to the
    existing \040 parser does not really make sense as it's unrelated, and
    leads to confusing behavior: it implicitly relies on the new entry being
    longer than the previous entry (since it just rewinds the FILE*).  Split
    it out into its own dedicated testcase instead.

    (cherry picked from commit b0e805fa0d6fea33745952df7b7f5442ca4c374f)

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

Summary of changes:
 ChangeLog                                          |   10 +++++
 NEWS                                               |    2 +-
 misc/Makefile                                      |    3 +-
 misc/mntent_r.c                                    |    4 +-
 .../tst-mntent-blank-corrupt.c                     |   27 +++++++------
 .../tst-mntent-blank-passno.c                      |   40 +++++++++++---------
 misc/tst-mntent.c                                  |   20 ----------
 7 files changed, 53 insertions(+), 53 deletions(-)
 copy libio/test-fmemopen.c => misc/tst-mntent-blank-corrupt.c (60%)
 copy math/tst-definitions.c => misc/tst-mntent-blank-passno.c (55%)

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