REDHAT-BUG-702687: Divide by Zero
First published: Fri May 06 2011(Updated: )
A flaw was discovered in systemtap's handling of DWARF expressions where it did not guard against two cases of divide by zero. This can result in a kernel div-by-zero message and possible busywait during stap module shutdown. A div-by-zero could cause the kernel to panic and if the kernel reboot on panic flag was set (panic_on_oops), it would cause the system to reboot. In order to trigger this flaw, it would require a user with staprun or stapdev group membership (or root privileges) to run a particular stap script operation on a hand-corrupted elf program.
| Affected Software | Affected Version | How to fix |
|---|---|---|
| systemtap systemtap |
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Reference Links
- https://bugzilla.redhat.com/show_bug.cgi/attachment.cgi?id=497383&action=diff
- https://bugzilla.redhat.com/show_bug.cgi/attachment.cgi?id=497383&action=edit
- https://access.redhat.com/security/cve/CVE-2011-1769
- https://access.redhat.com/security/cve/CVE-2011-1781
- http://sourceware.org/git/?p=systemtap.git;a=commit;h=fa2e3415185a28542d419a641ecd6cddd52e3cd9
- https://rhn.redhat.com/errata/RHSA-2011-0842.html
- https://rhn.redhat.com/errata/RHSA-2011-0841.html
- https://bugzilla.redhat.com/show_bug.cgi?id=702687
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- canonical/systemtap systemtap