Bug 1734973 - possible segfault in systemtap.bpf with foreach string key iteration
Summary: possible segfault in systemtap.bpf with foreach string key iteration
Alias: None
Product: Red Hat Enterprise Linux 8
Classification: Red Hat
Component: systemtap
Version: 8.1
Hardware: Unspecified
OS: Unspecified
Target Milestone: rc
: 8.0
Assignee: Serguei Makarov
QA Contact: Martin Cermak
Depends On:
TreeView+ depends on / blocked
Reported: 2019-07-31 17:46 UTC by Serguei Makarov
Modified: 2020-11-14 06:29 UTC (History)
4 users (show)

Fixed In Version:
Doc Type: No Doc Update
Doc Text:
Clone Of:
Last Closed: 2019-11-05 20:55:09 UTC
Type: Bug
Target Upstream Version:

Attachments (Terms of Use)
patch with reproducer testcase and bugfix (3.36 KB, text/plain)
2019-07-31 17:46 UTC, Serguei Makarov
no flags Details

System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHEA-2019:3366 0 None None None 2019-11-05 20:55:17 UTC

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

Description of problem:


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):

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.


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