Red Hat Bugzilla – Full Text Bug Listing
|Summary:||kernel should be built with -fwrapv [rhel-5.4]|
|Product:||Red Hat Enterprise Linux 5||Reporter:||Eugene Teo (Security Response) <eteo>|
|Component:||kernel||Assignee:||Don Zickus <dzickus>|
|Status:||CLOSED ERRATA||QA Contact:||Red Hat Kernel QE team <kernel-qe>|
|Version:||5.4||CC:||anton, dhoward, dzickus, emcnabb, jpirko, jplans, jskrabal, lwang, mgahagan, security-response-team|
|Fixed In Version:||Doc Type:||Bug Fix|
|Doc Text:||Story Points:||---|
|Last Closed:||2009-09-02 04:06:01 EDT||Type:||---|
|oVirt Team:||---||RHEL 7.3 requirements from Atomic Host:|
|Bug Depends On:|
Description Eugene Teo (Security Response) 2009-03-20 02:33:07 EDT
Description of problem: Add '-fwrapv' to gcc CFLAGS. This makes sure that gcc doesn't try to optimize away wrapping arithmetic, which the kernel occasionally uses for overflow testing, ie things like if (ptr + offset < ptr) which technically is undefined for non-unsigned types. See http://bugzilla.kernel.org/show_bug.cgi?id=12597 for details. Not all versions of gcc support it, so we need to make it conditional (it looks like it was introduced in gcc-3.4).
Comment 1 Eugene Teo (Security Response) 2009-03-20 02:34:00 EDT
Comment 7 RHEL Product and Program Management 2009-05-18 23:49:27 EDT
This request was evaluated by Red Hat Product Management for inclusion in a Red Hat Enterprise Linux maintenance release. Product Management has requested further review of this request by Red Hat Engineering, for potential inclusion in a Red Hat Enterprise Linux Update release for currently deployed products. This request is not yet committed for inclusion in an Update release.
Comment 9 Don Zickus 2009-05-21 11:36:35 EDT
in kernel-2.6.18-150.el5 You can download this test kernel from http://people.redhat.com/dzickus/el5 Please do NOT transition this bugzilla state to VERIFIED until our QE team has sent specific instructions indicating when to do so. However feel free to provide a comment indicating that this fix has been verified.
Comment 12 Eugene Teo (Security Response) 2009-07-20 04:02:25 EDT
See bug 512650. Use -fno-strict-overflow instead of -fwrapv.
Comment 14 errata-xmlrpc 2009-09-02 04:06:01 EDT
An advisory has been issued which should help the problem described in this bug report. This report is therefore being closed with a resolution of ERRATA. For more information on therefore solution and/or where to find the updated files, please follow the link below. You may reopen this bug report if the solution does not work for you. http://rhn.redhat.com/errata/RHSA-2009-1243.html