Bug 154451
| Summary: | CAN-2005-1762 x86_64 sysret exception leads to DoS | ||
|---|---|---|---|
| Product: | Red Hat Enterprise Linux 4 | Reporter: | Roland McGrath <roland> |
| Component: | kernel | Assignee: | Roland McGrath <roland> |
| Status: | CLOSED ERRATA | QA Contact: | Brian Brock <bbrock> |
| Severity: | high | Docs Contact: | |
| Priority: | medium | ||
| Version: | 4.0 | CC: | davej, jbaron, jparadis, mingo, mjc, riel, security-response-team |
| Target Milestone: | --- | Keywords: | Security |
| Target Release: | --- | ||
| Hardware: | x86_64 | ||
| OS: | Linux | ||
| Whiteboard: | impact=important,reported=20050411,source=redhat | ||
| Fixed In Version: | RHSA-2005-514 | Doc Type: | Bug Fix |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2005-10-05 12:59:07 UTC | Type: | --- |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
| Bug Depends On: | 154221 | ||
| Bug Blocks: | 156322 | ||
| Attachments: | |||
Created attachment 113013 [details] fix for iret fault cases This fixes the iret cases, and handles both a native 64-bit sigreturn case and the cases with 32-bit processes that bug 154221 deals with. These cases all have a fairly harmless failure mode (some console spew and a confusing user result), so buggy but not exploitable. I originally labelled this issue as CAN-2005-0756 however that was in error due to two similar ptrace check issues. The following is as reported to vendor-sec: Fixing rip -> CAN-2005-1762 Fixing fs_base and gs_base -> CAN-2005-0756 [PATCH] x86_64: check if ptrace RIP is canonical This works around an AMD Erratum. This is a DoS on 2.4 and 2.6 http://www.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=d1099e8a18960693c04507bdd7b9403db70bfd97 *** Bug 159916 has been marked as a duplicate of this bug. *** This is in linux-2.6.9-CAN-2005-0756-x86_64-ptrace-canonical-addr.patch in -11.34.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-2005-514.html |
Created attachment 113012 [details] fix for sysret fault case This fixes the case with that bad failure mode and DoS potential. This patch works against 2.6.12rc2 and against RHEL4 (6.38).