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From: "cvs-commit at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug dynamic-link/31187] Some CET tests fail with GCC 14
Date: Mon, 01 Jan 2024 23:56:42 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D31187

--- Comment #1 from Sourceware Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by H.J. Lu <hjl@sourceware.org>:

https://sourceware.org/git/gitweb.cgi?p=3Dglibc.git;h=3Db5dcccfb12385ee492e=
b074f6beb9ead56b5e5fd

commit b5dcccfb12385ee492eb074f6beb9ead56b5e5fd
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Mon Jan 1 07:55:18 2024 -0800

    x86/cet: Add -fcf-protection=3Dnone before -fcf-protection=3Dbranch

    When shadow stack is enabled, some CET tests failed when compiled with
    GCC 14:

    FAIL: elf/tst-cet-legacy-4
    FAIL: elf/tst-cet-legacy-5a
    FAIL: elf/tst-cet-legacy-6a

    which are caused by

    https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D113039

    These tests use -fcf-protection -fcf-protection=3Dbranch and assume that
    -fcf-protection=3Dbranch will override -fcf-protection.  But this GCC 14
    commit:

    https://gcc.gnu.org/git/gitweb.cgi?p=3Dgcc.git;h=3D1c6231c05bdcca

    changed the -fcf-protection behavior such that

    -fcf-protection -fcf-protection=3Dbranch

    is treated the same as

    -fcf-protection

    Use

    -fcf-protection -fcf-protection=3Dnone -fcf-protection=3Dbranch

    as the workaround.  This fixes BZ #31187.

    Tested with GCC 13 and GCC 14 on Intel Tiger Lake.
    Reviewed-by: Noah Goldstein <goldstein.w.n@gmail.com>

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