Bug 1734973

Summary: possible segfault in systemtap.bpf with foreach string key iteration
Product: Red Hat Enterprise Linux 8 Reporter: Serguei Makarov <smakarov>
Component: systemtapAssignee: Serguei Makarov <smakarov>
systemtap sub component: system-version QA Contact: Martin Cermak <mcermak>
Status: CLOSED ERRATA Docs Contact:
Severity: unspecified    
Priority: unspecified CC: fche, lberk, mcermak, mjw
Version: 8.1Keywords: Triaged
Target Milestone: rcFlags: pm-rhel: mirror+
Target Release: 8.0   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard:
Fixed In Version: Doc Type: No Doc Update
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2019-11-05 20:55:09 UTC Type: Bug
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Attachments:
Description Flags
patch with reproducer testcase and bugfix none

Description Serguei Makarov 2019-07-31 17:46:10 UTC 
Created attachment 1595459 [details]
patch with reproducer testcase and bugfix

Description of problem:

https://sourceware.org/git/gitweb.cgi?p=systemtap.git;a=commitdiff;h=e037dc796de75b0d9e7e893fba6a39c2837aca2b

In some circumstances foreach iteration with string keys in systemtap 4.1 can trigger a segfault in the userspace stapbpf interpreter.

Version-Release number of selected component (if applicable):
systemtap-4.1-3

How reproducible:

Use testcase foreach_string.stp provided in above patch.


Steps to Reproduce:
1. $ sudo stap -v --bpf foreach_string.stp.

Actual results:
Terminates with segfault.

Expected results:
No segfault.


Additional info:
Comment 6 errata-xmlrpc 2019-11-05 20:55:09 UTC 
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHEA-2019:3366