Bug 458937
| Summary: | net-smp fails to parse if_inet6 when the iface index is greater than 255 | ||||||
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| Product: | Red Hat Enterprise Linux 5 | Reporter: | Olivier Fourdan <ofourdan> | ||||
| Component: | net-snmp | Assignee: | Jan Safranek <jsafrane> | ||||
| Status: | CLOSED ERRATA | QA Contact: | |||||
| Severity: | medium | Docs Contact: | |||||
| Priority: | medium | ||||||
| Version: | 5.2 | CC: | kem, mkoci, rvokal, tao | ||||
| Target Milestone: | rc | ||||||
| Target Release: | --- | ||||||
| Hardware: | All | ||||||
| OS: | Linux | ||||||
| Whiteboard: | |||||||
| Fixed In Version: | Doc Type: | Bug Fix | |||||
| Doc Text: | Story Points: | --- | |||||
| Clone Of: | Environment: | ||||||
| Last Closed: | 2009-01-20 22:07:28 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: |
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This request was evaluated by Red Hat Product Management for inclusion in a Red Hat Enterprise Linux maintenance release. Product Management has requested further review of this request by Red Hat Engineering, for potential inclusion in a Red Hat Enterprise Linux Update release for currently deployed products. This request is not yet committed for inclusion in an Update release. QA acked for 5.3. An advisory has been issued which should help the problem described in this bug report. This report is therefore being closed with a resolution of ERRATA. For more information on therefore solution and/or where to find the updated files, please follow the link below. You may reopen this bug report if the solution does not work for you. http://rhn.redhat.com/errata/RHBA-2009-0230.html |
Created attachment 314189 [details] Patch to increase the lengths of the index in sscanf Description of problem: With a large number of interfaces (like in a Xen environments with multiple xen bridges), the index of the interfaces can be greater than 255. In such a case, net-snmp will fails to parse /proc/net/if_inet6 if one of the index is greater than 0xFF and will generate errors. Version-Release number of selected component (if applicable): net-snmp-5.3.1-24.el5_2.1 How reproducible: 100% reproducible Steps to Reproduce: 1.Set-up an system with a lot of network interfaces 2.Check if one of the interfaces in proc/net/if_inet6 has an index greater than 0xFF 3.Install and configure net-snmp Actual results: snmpd[13835]: ioctl 35123 returned -1 last message repeated <many> times ... Expected results: No error message Additional info: The parsing is done in _load_v6() (in agent/mibgroup/ip-mib/data_access/ipaddress_linux.c) with: /* * fe800000000000000200e8fffe5b5c93 05 40 20 80 eth0 * A D P S F I * A: address * D: device number * P: prefix len * S: scope (see include/net/ipv6.h, net/ipv6/addrconf.c) * F: flags (see include/linux/rtnetlink.h, net/ipv6/addrconf.c) * I: interface */ rc = sscanf(line, "%39s %02x %02x %02x %02x %8s\n", addr, &if_index, &pfx_len, &scope, &flags, if_name); So if the index is greater than 0xFF, scanf %02x will not read the entire index and break the pasing of the remaining items.