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From: "hjl.tools at gmail dot com" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug dynamic-link/31187] New: Some CET tests fail with GCC 14
Date: Fri, 22 Dec 2023 16:27:43 +0000
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X-Bugzilla-Component: dynamic-link
X-Bugzilla-Version: 2.39
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D31187

            Bug ID: 31187
           Summary: Some CET tests fail with GCC 14
           Product: glibc
           Version: 2.39
            Status: NEW
          Severity: normal
          Priority: P2
         Component: dynamic-link
          Assignee: unassigned at sourceware dot org
          Reporter: hjl.tools at gmail dot com
  Target Milestone: ---
            Target: x86_64

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 -fcf-protection=3Dbranch will override -fcf-protection.
But

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 the same as

-fcf-protection

The workaround is to use

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

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