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1.74.10. RHSA-2011:1386: Important: kernel security, bug fix, and enhancement update
Important
This update has already been released as the security errata RHSA-2011:1386.
Updated kernel packages that fix multiple security issues, several bugs, and add an enhancement are now available for Red Hat Enterprise Linux 5.
The Red Hat Security Response Team has rated this update as having important security impact. Common Vulnerability Scoring System (CVSS) base scores, which give detailed severity ratings, are available for each vulnerability from the CVE links after each description below.
The kernel packages contain the Linux kernel, the core of any Linux operating system.
Security fixes
The maximum file offset handling for ext4 file systems could allow a local, unprivileged user to cause a denial of service. (CVE-2011-2695, Important)
IPv6 fragment identification value generation could allow a remote attacker to disrupt a target system's networking, preventing legitimate users from accessing its services. (CVE-2011-2699, Important)
A malicious CIFS (Common Internet File System) server could send a specially-crafted response to a directory read request that would result in a denial of service or privilege escalation on a system that has a CIFS share mounted. (CVE-2011-3191, Important)
A local attacker could use mount.ecryptfs_private to mount (and then access) a directory they would otherwise not have access to. Note: To correct this issue, the RHSA-2011:1241 ecryptfs-utils update must also be installed. (CVE-2011-1833, Moderate)
A flaw in the taskstats subsystem could allow a local, unprivileged user to cause excessive CPU time and memory use. (CVE-2011-2484, Moderate)
Mapping expansion handling could allow a local, unprivileged user to cause a denial of service. (CVE-2011-2496, Moderate)
GRO (Generic Receive Offload) fields could be left in an inconsistent state. An attacker on the local network could use this flaw to cause a denial of service. GRO is enabled by default in all network drivers that support it. (CVE-2011-2723, Moderate)
RHSA-2011:1065 introduced a regression in the Ethernet bridge implementation. If a system had an interface in a bridge, and an attacker on the local network could send packets to that interface, they could cause a denial of service on that system. Xen hypervisor and KVM (Kernel-based Virtual Machine) hosts often deploy bridge interfaces. (CVE-2011-2942, Moderate)
A flaw in the Xen hypervisor IOMMU error handling implementation could allow a privileged guest user, within a guest operating system that has direct control of a PCI device, to cause performance degradation on the host and possibly cause it to hang. (CVE-2011-3131, Moderate)
IPv4 and IPv6 protocol sequence number and fragment ID generation could allow a man-in-the-middle attacker to inject packets and possibly hijack connections. Protocol sequence number and fragment IDs are now more random. (CVE-2011-3188, Moderate)
A flaw in the kernel's clock implementation could allow a local, unprivileged user to cause a denial of service. (CVE-2011-3209, Moderate)
Non-member VLAN (virtual LAN) packet handling for interfaces in promiscuous mode and also using the be2net driver could allow an attacker on the local network to cause a denial of service. (CVE-2011-3347, Moderate)
A flaw in the auerswald USB driver could allow a local, unprivileged user to cause a denial of service or escalate their privileges by inserting a specially-crafted USB device. (CVE-2009-4067, Low)
A flaw in the Trusted Platform Module (TPM) implementation could allow a local, unprivileged user to leak information to user space. (CVE-2011-1160, Low)
A local, unprivileged user could possibly mount a CIFS share that requires authentication without knowing the correct password if the mount was already mounted by another local user. (CVE-2011-1585, Low)
Red Hat would like to thank Fernando Gont for reporting CVE-2011-2699; Darren Lavender for reporting CVE-2011-3191; the Ubuntu Security Team for reporting CVE-2011-1833; Vasiliy Kulikov of Openwall for reporting CVE-2011-2484; Robert Swiecki for reporting CVE-2011-2496; Brent Meshier for reporting CVE-2011-2723; Dan Kaminsky for reporting CVE-2011-3188; Yasuaki Ishimatsu for reporting CVE-2011-3209; Somnath Kotur for reporting CVE-2011-3347; Rafael Dominguez Vega for reporting CVE-2009-4067; and Peter Huewe for reporting CVE-2011-1160. The Ubuntu Security Team acknowledges Vasiliy Kulikov of Openwall and Dan Rosenberg as the original reporters of CVE-2011-1833.
Bug Fixes
- BZ#739823
- A previously applied patch to help clean-up a failed
nmi_watchdogcheck by disabling various registers caused single-vcpu Xen HVM guests to become unresponsive during boot when the host CPU was an Intel Xeon Processor E5405 or an Intel Xeon Processor E5420, and the VM configuration did not have theapic = 1parameter set. With this update,NMI_NONEis the default watchdog on AMD64 HVM guests, thus, fixing this issue. - BZ#730686
- A previously introduced patch forced the
->flushand->fsyncoperations to wait on all WRITE and COMMIT remote procedure calls (RPC) to complete to ensure that those RPCs were completed before returning fromfsync()orclose(). As a consequence, all WRITEs issued bynfs_flush_listwere serialized and caused a performance regression on NFS clients. This update changesnfs_flush_oneandnfs_flush_multito not wait for WRITEs issued when theFLUSH_SYNCparameter is set, resolving performance issues on NFS clients. - BZ#733665
- When setting the value in the
/proc/sys/vm/dirty_writeback_centisecsfile viaecho, the actual saved value was always one less than the given value (for example, setting 500 resulted in 499 being set). This update fixes this off-by-one error, and values in/proc/sys/vm/dirty_writeback_centisecsare now correctly set. - BZ#732775
- When reading a file from a subdirectory in
/proc/bus/pci/while hot-unplugging the device related to that file, the system would crash. With this update, the kernel correctly handles the simultaneous removal of a device, and access to the representation of that device in theprocfile system. - BZ#738389
- Prior to this update, MTU was constrained to 1500 unless Scatter/Gather I/O (SG) was supported by the NIC; in the case of netback, this would mean unless SG was supported by the front-end. Because the hotplugging scripts ran before features have been negotiated with the front-end, at that point SG would still be disabled, breaking anything using larger MTUs, (for example, cluster communication using that NIC). This update inverts the behavior and assumes SG to be present until negotiations prove otherwise (in such a case, MTU is automatically reduced).
- BZ#734157
- A previously applied patch introduced a regression for 3rd party file systems that do not set the
FS_HAS_IODONE2flag, specifically, the Oracle Cluster File System 2 (OCFS2). The patch removed a call to theaio_completefunction, resulting in no completion events being processed, causing userspace applications to become unresponsive. This update reintroduces theaio_completefunction call, fixing this issue. - BZ#732946
- This update fixes a race between TX and MCC events where an MCC event could kill a NAPI schedule by a succeeding TX event, which resulted in network transfer pauses.
- BZ#730685
- Previously, when the Xen Hypervisor split a 2 MB page into 4 KB pages, it linked the new page from the PDE (Page Directory Entry) before it filled entries of the page with appropriate data. Consequently, when doing a live migration with EPT (Extended Page Tables) enabled on a non-idle guest running with more than two virtual CPUs, the guest often terminated unexpectedly. With this update, the Xen Hypervisor prepares the page table entry first, and then links it in, fixing this bug.
- BZ#730682
- This update adds a missing patch that enables WOL (Wake-on-LAN) on the second port of a Intel Ethernet Server Adapter I350.
- BZ#736275
- Kernel panic occurred on a Red Hat Enterprise Linux 5.7 QLogic FCoE host during I/O operations with fabric faults due to a NULL
fcportobject dereference in theqla24xx_queuecommandfunction. This update adds a check that returnsDID_NO_CONNECTif thefcportobject is NULL. - BZ#732945
- Packet statistics in
/proc/net/devoccasionally jumped backwards. This was because thecat /proc/net/devcommand was processed while the loop updating the counter was running, sometimes resulting in partially updated counter (causing the statistics to be incorrect). This update fixes this bug by using a temporary variable while summing up all the RX queues, and only then updating the/proc/net/devstatistics, making the whole operation atomic. Additionally, this update provides a patch that fixes a problem with the 16-bit RX dropped packets HW counter by maintaining a 32-bit accumulator in the driver to prevent frequent wraparound. - BZ#734772
- Prior to this update, the
nosharecacheNFS mount option was not always honored. If two mount locations specified this option, the behavior would be the same as if the option was not specified. This was because of missing checks that enforced this option. This update adds the missing checks, resolving this issue. - BZ#728521
- When kdump was triggered under a heavy load, the system became unresponsive and failed to capture a crash dump. This update fixes interrupt handling for kdump so that kdump successfully captures a crash dump while under a heavy load.
- BZ#732440
- Previously, configurations where Max BW was set to 0 produced the following message:
Illegal configuration detected for Max BW - using 100 instead.
With this update, such message is produced only when debugging is enabled, and such configuration is no longer called Illegal. - BZ#733152
- If the
be2netdriver could not allocate new SKBs in the RX completion handler, it returned messages to the console and dropped packets. With this update, the driver increases thenetdevicerx_droppedcounter instead, and no longer produces messages in the console. - BZ#734761
- If iSCSI was not supported on a
bnx2device, thebnx2_cnic_probe()function returned NULL and thecnicdevice was not be visible tobnx2i. This preventedbnx2ifrom registering and then unregistering duringcnic_start()and caused the following warning message to appear:bnx2 0003:01:00.1: eth1: Failed waiting for ULP up call to complete
- BZ#737475
- Prior to this update, failures to bring up the Broadcom BCM57710 Ethernet Controller occurred and the following error messages:
eth0: Something bad had happen! Aii! [bnx2x_release_hw_lock:1536(eth0)]Releasing a lock on resource 8 eth0: Recovery flow hasn't been properly completed yet. Try again later. If u still see this message after a few retries then power cycle is required.
With this update, the underlying source code has been modified to address this issue, and the Broadcom BCM57710 Ethernet Controller no longer fails to start. - BZ#738392
- This update introduces support for jumbo frames in the Xen networking backend. However, old guests will still revert to a 1500-byte MTU after migration. This update also changes how the guest will probe the backend's Scatter/Gather I/O functionality. As long as a recent enough kernel is installed in the destination host, this will ensure that the guest will keep a large MTU even after migration.
- BZ#736742
- Previously, the
inet6_sk_generic()function was using theobj_sizevariable to compute the address of its inner structure, causing memory corruption. With this update, thesk_alloc_size()is called every time there is a request for allocation, and memory corruption no longer occurs. - BZ#728518
- Prior to this update, Xen did not implement certain ALU opcodes. As a result, when a driver used the missing opcodes on memory-mapped I/O areas, it caused the guest to crash. This update adds all the missing opcodes. In particular, this fixes a BSOD crash from the Windows
e1000driver.
Enhancements
- BZ#732377
- With this update, the JSM driver has been updated to support the Bell2 (with PLX chip) 2-port adapter on IBM POWER7 systems. Additionally, EEH support has been added to JSM driver.
Users should upgrade to these updated packages, which contain backported patches to correct these issues and add this enhancement. The system must be rebooted for this update to take effect.
