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4.189. net-snmp
Updated net-snmp packages that fix several bugs are now available for Red Hat Enterprise Linux 6.
The net-snmp packages provide various libraries and tools for the Simple Network Management Protocol (SNMP), including an SNMP library, an extensible agent, tools for requesting or setting information from SNMP agents, tools for generating and handling SNMP traps, a version of the
netstat
command which uses SNMP, and a Tk/Perl management information base (MIB) browser.
Bug Fixes
- BZ#678314
- The previous version of
snmptrapd
, the Net-SNMP daemon for processing traps, leaked memory when processing incoming SNMP traps in embedded Perl. This caused the amount of consumed memory to grow over time, making the memory consumption even larger if the daemon was processing SNMPv1 traps. With this update, the underlying source code has been adapted to prevent such memory leaks, and processing incoming SNMP traps in embedded Perl no longer increases the memory consumption. - BZ#681949
- On 64-bit systems, the previous version of
snmpd
, the Net-SNMP agent, gathered the disk IO and CPU usage statistics forUCD-SNMP::systemStats
as 64-bit. However, relevant MIB describes these statistics as 32-bit and as a consequence,snmpd
wrote the following message to the system log when processing the 64-bit values:truncating integer value > 32 bits
This update adaptssnmpd
to collect values forUCD-SNMP::systemStats
as 32-bit integers so that it no longer reports the aforementioned message to syslog. - BZ#683563
- The previous version of the
snmpd
daemon did not detect errors when accessing the/proc
file system. Consequent to this, an attempt to read information about an exited process while gathering information for aHOST-RESOURCES-MIB::hrSWRunTable
table caused the daemon to terminate unexpectedly with a segmentation fault. This update adapts the underlying source code to make sure that such errors are now properly detected, andsnmpd
no longer crashes when populatingHOST-RESOURCES-MIB::hrSWRunTable
. - BZ#683680
- Prior to this update, the
snmpd
daemon reportedHOST-RESOURCES-MIB::hrSystemDate
with an incorrect sign in the timezone offset. This update applies a patch to make sure the timezone offset is properly recalculated and the value reported bysnmpd
is now correct. - BZ#702165
- Previously, the
snmpd
daemon tracked all network interfaces that were present on the system while it was running, including interfaces that were removed from the system during this time. Consequent to this, when an interface which had been removed was re-instantiated with the same name but with a different interface index,snmpd
reported both interfaces separately inIF-MIB::ifTable
. This typically happened to Point-to-Point Protocol (PPP) interfaces. This update adds two new options,interface_fadeout
andinterface_replace_old
, to the/etc/snmpd/snmpd.conf
configuration file, which allows system administrators to control the behavior ofsnmpd
when two interfaces with the same name but a different interface index are detected. Refer to the snmpd.conf(5) manual page for details. - BZ#702171
- When running on a system with two network interfaces with the same IP address, the previous version of the
snmpd
daemon silently ignored the second interface while populatingIP-MIB::ipAddressTable
. With this update,snmpd
has been adapted to add a message that the second interface is being ignored to the system log in this scenario. This allows system administrators to determine why the second interface is missing fromIP-MIB::ipAddressTable
. - BZ#703682
- The previous version of the
snmpd
daemon ignoredSIGCHLD
signals from processes that were spawned as a result of thepass_persist
configuration option. However, this led to unnecessary defunct processes on the system. With this update, thesnmpd
daemon has been adapted to correctly process theSIGCHLD
signals so that such defunct processes are no longer created. - BZ#707912
- Prior this update, the
snmpd
daemon incorrectly ignored XFS file systems when populatingHOST-RESOURCES-MIB::hrFSTable
. This update adds support for the XFS file system toHOST-RESOURCES-MIB::hrFSTable
so thatsnmpd
no longer omits such file systems from the report. - BZ#708370
- In previous versions of net-snmp, the
snmpd
daemon did not distinguish between outgoing SMUX messages and always incremented theirRequest-ID
, even when multiple SMUX messages were sent as a result of one incoming SNMP request with multiple variables. However, RFC 1227 requires that such SMUX messages should have the sameRequest-ID
. With this update,snmpd
properly recognizes multiple outgoing SMUX messages that are the result of one incoming SNMP request and assigns them the sameRequest-ID
. - BZ#708947
- When the system ran out of memory while populating
IP-MIB::ipNetToPhysicalTable
, the previous version of thesnmpd
daemon did not properly recover and may have terminated unexpectedly as a consequence. This update adapts the underlying source code to detect that the system is running out of memory, andsnmpd
no longer crashes in this situation. - BZ#710667
- Prior to this update, the
netsnmp
module for the Python programming language did not properly initialize an SNMP session with SNMPv3 authentication. Consequent to this, and attempt to use such a session caused Python to terminate unexpectedly with a segmentation fault. This update ensures that SNMP sessions with SNMPv3 authentication are now initialized properly and can be used in Python modules as expected. - BZ#711481
- The previous version of the
netsnmp
Python module did not properly parse OID names that included an MIB name (such asIF-MIB::ifTable
). With this update, the regular expression for parsing OID names has been corrected and the aforementioned Python module now parses such names properly. - BZ#720704
- Previously, the
snmpd
daemon did not verify the result of reading from a network socket in the SMUX module. Consequent to this,snmpd
may have been unable to close erroneous SMUX sessions, because it failed to detect some network errors. With this update, thesnmpd
daemon has been adapted to properly detect errors when reading from a SMUX socket so that it can now react to these errors properly. - BZ#729738
- When an
AgentX
subagent was being disconnected from thesnmpd
daemon, the daemon did not properly detach all outstanding SNMP requests from the internal session object representing this agent. As a consequence,snmpd
could terminate unexpectedly while processing these requests. With this update, thesnmpd
daemon ensures that outstanding SNMP requests do not point to an AgentX session that is closed. - BZ#725657
- When a binary is built with the
RELRO
flag, the ELF sections are reordered to include internal data sections before program's data sections, and the Global Offset Table (GOT) address section of the resulting ELF file is mapped read-only. This ensures that any attempt to overwrite the GOT entry and gain control over the execution flow of a program fails with an error. For this reason, the Net-SNMP daemons, binaries, and shared libraries are now built with fullRELRO
protection.
All users of net-snmp are advised to upgrade to these updated packages, which fix these bugs.
Updated net-snmp packages that fix one bug are now available for Red Hat Enterprise Linux 6.
The net-snmp packages provide various libraries and tools for the Simple Network Management Protocol (SNMP), including an SNMP library, an extensible agent, tools for requesting or setting information from SNMP agents, tools for generating and handling SNMP traps, a version of the netstat command which uses SNMP, and a Tk/Perl Management Information Base (MIB) browser.
Bug Fix
- BZ#753766
- The SNMP daemon (snmpd) did not properly fill a set of watched socket file descriptors. Therefore, the daemon sometimes terminated unexpectedly with the "select: bad file descriptor" error message when more than 32 AgentX subagents connected to snmpd on 32-bit platforms or more than 64 subagents on 64-bit platforms. With this update, snmpd properly clears sets of watched file descriptors and thus it no longer crashes when handling a large number of subagents.
All users of net-snmp are advised to upgrade to these updated packages, which fix this bug.
Updated net-snmp packages that fix one bug are now available for Red Hat Enterprise Linux 6 Extended Update Support.
The net-snmp packages provide various libraries and tools for the Simple Network Management Protocol (SNMP), including an SNMP library, an extensible agent, tools for requesting or setting information from SNMP agents, tools for generating and handling SNMP traps, a version of the netstat command which uses SNMP, and a Tk/Perl Management Information Base (MIB) browser.
Bug Fix
- BZ#1002858
- When an AgentX subagent disconnected from the SNMP daemon (snmpd), the daemon did not properly check that there were no active requests queued in the subagent and destroyed the session. Consequently, the session was referenced by snmpd later when processing queued requests and because it was already destroyed, snmpd terminated unexpectedly with a segmentation fault or looped indefinitely. This update adds several checks to prevent the destruction of sessions with active requests, and snmpd no longer crashes in the described scenario.
Users of net-snmp are advised to upgrade to these updated packages, which fix this bug.
Updated net-snmp packages that fix one bug are now available for Red Hat Enterprise Linux 6 Extended Update Support.
The net-snmp packages provide various libraries and tools for the Simple Network Management Protocol (SNMP), including an SNMP library, an extensible agent, tools for requesting or setting information from SNMP agents, tools for generating and handling SNMP traps, a version of the netstat command which uses SNMP, and a Tk/Perl Management Information Base (MIB) browser.
Bug Fix
- BZ#956287
- Previously, snmpd erroneously checked the length of "SNMP-TARGET-MIB::snmpTargetAddrRowStatus" value in incoming "SNMP-SET" requests on 64-bit platforms. Consequently, snmpd sent an incorrect reply to the "SNMP-SET" request. With this update, the check of "SNMP-TARGET-MIB::snmpTargetAddrRowStatus" is fixed and it is possible to set it remotely using "SNMP-SET" messages.
Users of net-snmp are advised to upgrade to these updated packages, which fix this bug.
Updated net-snmp packages that fix one bug are now available for Red Hat Enterprise Linux 6 Extended Update Support.
The net-snmp packages provide various libraries and tools for the Simple Network Management Protocol (SNMP), including an SNMP library, an extensible agent, tools for requesting or setting information from SNMP agents, tools for generating and handling SNMP traps, a version of the netstat command which uses SNMP, and a Tk/Perl Management Information Base (MIB) browser.
Bug Fix
- BZ#986191
- In previous Net-SNMP releases, snmpd reported an invalid speed of network interfaces in IF-MIB::ifTable and IF-MIB::ifXTable if the interface had a speed other than 10, 100, 1000 or 2500 MB/s. Thus, the net-snmp ifHighSpeed value returned was "0" compared to the correct speed as reported in ethtool, if the Virtual Connect speed was set to, for example, 0.9 Gb/s. With this update, the ifHighSpeed value returns the correct speed as reported in ethtool, and snmpd correctly reports non-standard network interface speeds.
Users of net-snmp are advised to upgrade to these updated packages, which fix this bug.