Bug 1232265 (CVE-2015-3239) - CVE-2015-3239 libunwind: off-by-one in dwarf_to_unw_regnum()
Summary: CVE-2015-3239 libunwind: off-by-one in dwarf_to_unw_regnum()
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2015-3239
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1233114 1238264 1238265 1238852 1238853 1238854 1238855 1238856 1238857 1238858 1238859 1250665
Blocks: 1232274
TreeView+ depends on / blocked
 
Reported: 2015-06-16 11:44 UTC by Vasyl Kaigorodov
Modified: 2023-05-13 00:19 UTC (History)
29 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed: 2016-01-28 20:51:00 UTC
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
GNU Savannah 45276 0 None None None Never
Red Hat Product Errata RHSA-2015:1675 0 normal SHIPPED_LIVE Low: libunwind security update 2015-08-24 23:57:58 UTC
Red Hat Product Errata RHSA-2015:1768 0 normal SHIPPED_LIVE Low: libunwind security update 2015-09-10 16:05:00 UTC
Red Hat Product Errata RHSA-2015:1769 0 normal SHIPPED_LIVE Low: libunwind security update 2015-09-10 16:04:37 UTC

Description Vasyl Kaigorodov 2015-06-16 11:44:54 UTC 
Paolo Bonzini from Red Hat reported following issue in libunwind:

An invalid DW_OP_bregXX opcodes can access dwarf_to_unw_regnum_map one
item past the end. Spotted by Coverity, suggested patch below:

"""
--- a/include/dwarf_i.h
+++ b/include/dwarf_i.h
@@ -20,7 +20,7 @@
extern const uint8_t dwarf_to_unw_regnum_map[DWARF_REGNUM_MAP_LENGTH];
/* REG is evaluated multiple times; it better be side-effects free! */
# define dwarf_to_unw_regnum(reg) \
- (((reg) <= DWARF_REGNUM_MAP_LENGTH) ? dwarf_to_unw_regnum_map[reg] : 0)
+ (((reg) < DWARF_REGNUM_MAP_LENGTH) ? dwarf_to_unw_regnum_map[reg] : 0)
#endif

#ifdef UNW_LOCAL_ONLY
"""

Upstream bug: http://savannah.nongnu.org/bugs/?45276
Comment 3 Vasyl Kaigorodov 2015-07-01 13:38:26 UTC 
Upstream fix:

http://git.savannah.gnu.org/cgit/libunwind.git/commit/?id=396b6c7ab737e2bff244d640601c436a26260ca1
Comment 4 Vasyl Kaigorodov 2015-07-01 13:40:08 UTC 
Created libunwind tracking bugs for this issue:

Affects: fedora-all [bug 1238264]
Affects: epel-all [bug 1238265]
Comment 9 Fedora Update System 2015-07-21 08:08:54 UTC 
libunwind-1.1-10.fc22 has been pushed to the Fedora 22 stable repository.  If problems still persist, please make note of it in this bug report.
Comment 10 Fedora Update System 2015-07-30 00:37:15 UTC 
libunwind-1.1-10.fc21 has been pushed to the Fedora 21 stable repository.  If problems still persist, please make note of it in this bug report.
Comment 11 Garth Mollett 2015-07-31 00:57:32 UTC 
Acknowledgements:

This issue was discovered by Paolo Bonzini of Red Hat.
Comment 13 Fedora Update System 2015-07-31 18:34:12 UTC 
libunwind-1.1-3.el6 has been pushed to the Fedora EPEL 6 stable repository.  If problems still persist, please make note of it in this bug report.
Comment 14 Fedora Update System 2015-07-31 18:35:58 UTC 
libunwind-1.1-10.el7 has been pushed to the Fedora EPEL 7 stable repository.  If problems still persist, please make note of it in this bug report.
Comment 19 errata-xmlrpc 2015-08-24 19:58:08 UTC 
This issue has been addressed in the following products:

  OpenStack 6 for RHEL 7

Via RHSA-2015:1675 https://rhn.redhat.com/errata/RHSA-2015-1675.html
Comment 20 errata-xmlrpc 2015-09-10 12:04:49 UTC 
This issue has been addressed in the following products:

  OpenStack 5 for RHEL 7

Via RHSA-2015:1769 https://rhn.redhat.com/errata/RHSA-2015-1769.html
Comment 21 errata-xmlrpc 2015-09-10 12:05:14 UTC 
This issue has been addressed in the following products:

  OpenStack 5 for RHEL 6

Via RHSA-2015:1768 https://rhn.redhat.com/errata/RHSA-2015-1768.html
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