Bug 146089
| Summary: | 20050115 ptrace/kill and ptrace/dump race fixes | ||||||
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| Product: | Red Hat Enterprise Linux 4 | Reporter: | Mark J. Cox <mjc> | ||||
| Component: | kernel | Assignee: | Roland McGrath <roland> | ||||
| Status: | CLOSED ERRATA | QA Contact: | Brian Brock <bbrock> | ||||
| Severity: | low | Docs Contact: | |||||
| Priority: | medium | ||||||
| Version: | 4.0 | CC: | davej, ezannoni, jbaron, riel, roland | ||||
| Target Milestone: | --- | Keywords: | Security | ||||
| Target Release: | --- | ||||||
| Hardware: | All | ||||||
| OS: | Linux | ||||||
| Whiteboard: | impact=low,public=20050115 | ||||||
| Fixed In Version: | Doc Type: | Bug Fix | |||||
| Doc Text: | Story Points: | --- | |||||
| Clone Of: | Environment: | ||||||
| Last Closed: | 2005-06-08 15:13:36 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: | |||||||
| Bug Blocks: | 137160, 145334 | ||||||
| Attachments: |
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Agreed, this can be deferred. Patches confirmed in 2.6.9-6.37.EL. Moving to PROD_READY. 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-2005-420.html Created attachment 120583 [details]
test case for case #3 (exec deadlock)
For regression testing, this is my test case for the #3 scenario, an exec that
leaves an unkillable stopped process.
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On 20050115, Roland commited a number of fixes to 2.6-bk in order to correct races. We've not investigated the impact of these issues but they look from the descriptions like they could lead to and unprivileged user deadlocking a system (DoS, crash). Please let us know if this is incorrect. 1. fix coredump_wait deadlock with ptracer & tracee on shared mm fixed=2.6-bk (20050115 cset@41e9a97cuQ7FWekabtf12Orvpfbp1w) 2. fix race between core dumping and exec with shared mm fixed=2.6-bk (20050115 cset@41e9a98dJKJjUrTCrKsyak1DOQxQug) 3. fix exec deadlock when ptrace used inside the thread group fixed=2.6-bk (20050115 cset@41e9a99fugWWHLAKeLYyNRl6h9RHlg) 4. clear false pending signal indication in core dump fixed=2.6-bk (20050115 cset@41e9a9bcwYGXPK_HRWKybNR060H80g) (Prefix cset@ with http://linux.bkbits.net:8080/linux-2.6/ for a direct link to each fix)