Bug 107307
| Summary: | Exec Shield in 2.6 kernel causes random executable crashes | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Product: | [Fedora] Fedora | Reporter: | Daniel Walsh <dwalsh> | ||||||
| Component: | kernel | Assignee: | Arjan van de Ven <arjanv> | ||||||
| Status: | CLOSED CURRENTRELEASE | QA Contact: | Brian Brock <bbrock> | ||||||
| Severity: | high | Docs Contact: | |||||||
| Priority: | medium | ||||||||
| Version: | rawhide | CC: | roland | ||||||
| Target Milestone: | --- | ||||||||
| Target Release: | --- | ||||||||
| Hardware: | i686 | ||||||||
| OS: | Linux | ||||||||
| Whiteboard: | |||||||||
| Fixed In Version: | Doc Type: | Bug Fix | |||||||
| Doc Text: | Story Points: | --- | |||||||
| Clone Of: | Environment: | ||||||||
| Last Closed: | 2004-09-21 18:55:33 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: | |||||||||
| Attachments: |
|
||||||||
Created attachment 95234 [details]
reproducer program for kernel stack bug
This test program reproduces the bug every time run with an argument >= 2.
This happens for me even with /proc/sys/kernel/exec-shield set to 0,
on kernel-smp-2.6.0-0.test7.1.59.i686 (on dual PIII).
It does not happen with my own build of vanilla 2.6.
Created attachment 95237 [details]
fix for overflow in expand_stack rlimit check
I think I got it by dead reckoning. When the limit is set to RLIM_INFINITY,
the check in expand_stack will overflow and give a false positive.
I haven't tried this patch, but it probably fixes it.
Seems to be fixed. |
From Bugzilla Helper: User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.5) Gecko/20030927 Description of problem: System seems unstable with 2.6 kernel and exec shield installed. I have seen emacs, find, gcc and prelink fail with segfaults. Version-Release number of selected component (if applicable): 2.6.0-0.test7.1.57 How reproducible: Always Steps to Reproduce: 1.Install 2.6.0-0.test7.1.57 kernel 2. set /proc/sys/kernel/exec_shield to 1 3. run rpmbuild --rebuild prelink*src.rpm 4. Build crashes 5. set /proc/sys/kernel/exec_shield to 0 6. run rpmbuild --rebuild prelink*src.rpm 7. Build succeeds Actual Results: Seg faults Expected Results: No Seg Faults Additional info: I am doing this testing on an box with SELinux enabled. Although I have turned off the SELinux and still seen this behaviour. The crashes do not happen in the same place ever time. I have started emacs had it crash and recall command and it works.