The following upstream patch checks if ptrace RIP is canonical; without this a user can cause a crash. http://www.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=d1099e8a18960693c04507bdd7b9403db70bfd97
Mark, this bug and bug 159917 are mixed up. You reversed the CVE names. Changing this summary to "CAN-2005-0756 x86_64 crash (ptrace-canonical)". *** This bug has been marked as a duplicate of 155978 ***
A fix for this problem has just been committed to the RHEL3 U6 patch pool this evening (in kernel version 2.4.21-32.8.EL).
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 the 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-2005-663.html