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[Bug regex/18986] ERE '0|()0|\1|0' causes regexec undefined behavior


https://sourceware.org/bugzilla/show_bug.cgi?id=18986

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=eb04c21373e2a2885f3d52ff192b0499afe3c672

commit eb04c21373e2a2885f3d52ff192b0499afe3c672
Author: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Date:   Wed Dec 20 09:47:44 2017 -0200

    posix: Sync gnulib regex implementation

    This patch syncs the regex implementation with gnulib (commit 0ee5212).
    Only two changes in GLIBC regex testing are required:

      1. posix/bug-regex28.c: as previously discussed [1] the change of
         expected results on the pattern should be safe.

      2. posix/PCRE.tests: the ERE (a)|\1 is malformed (in the sense that
         the \1 doesn't mean anything) and although current GLIBC accepts
         it has undefined behavior.  This patch removes the specific test.

    This sync contains some patches from thread 'Regex: Make libc regex
    more usable outside GLIBC.' [2] which have been pushed upstream in
    gnulib.  This patches also fixes some regex issues (BZ #23233,
    BZ #21163, BZ #18986, BZ #13762) and I did not add testcases for
    both #23233 and #13762 because I couldn't think a simple way to
    trigger the expected failure path to trigger them.

    Checked on x86_64-linux-gnu and i686-linux-gnu.

        [BZ #23233]
        [BZ #21163]
        [BZ #18986]
        [BZ #13762]
        * posix/Makefile (tests): Add bug-regex37 and bug-regex38.
        * posix/PCRE.tests: Remove invalid test.
        * posix/bug-regex28.c: Fix expected values for used syntax.
        * posix/bug-regex37.c: New file.
        * posix/bug-regex38.c: Likewise.
        * posix/regcomp.c: Sync with gnulib.
        * posix/regex.c: Likewise.
        * posix/regex.h: Likewise.
        * posix/regex_internal.c: Likewise.
        * posix/regex_internal.h: Likewise.
        * posix/regexec.c: Likewise.

    [1] https://sourceware.org/ml/libc-alpha/2017-12/msg00807.html
    [2] https://sourceware.org/ml/libc-alpha/2017-12/msg00237.html

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

Summary of changes:
 ChangeLog                                       |   18 +
 posix/Makefile                                  |    3 +-
 posix/PCRE.tests                                |   13 -
 posix/bug-regex28.c                             |   46 +-
 wcsmbs/test-char-types.c => posix/bug-regex37.c |   11 +-
 wcsmbs/test-char-types.c => posix/bug-regex38.c |   11 +-
 posix/regcomp.c                                 |  597 +++++++++------
 posix/regex.c                                   |   21 +-
 posix/regex.h                                   |  335 +++++----
 posix/regex_internal.c                          |  295 ++++----
 posix/regex_internal.h                          |  442 ++++++++----
 posix/regexec.c                                 |  936 ++++++++++++-----------
 12 files changed, 1557 insertions(+), 1171 deletions(-)
 copy wcsmbs/test-char-types.c => posix/bug-regex37.c (78%)
 copy wcsmbs/test-char-types.c => posix/bug-regex38.c (78%)

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