rhsa-2011_1321
Vulnerability from csaf_redhat
Published
2011-09-20 17:45
Modified
2024-11-05 17:36
Summary
Red Hat Security Advisory: kernel security and bug fix update
Notes
Topic
Updated kernel packages that fix one security issue and several bugs are
now available for Red Hat Enterprise Linux 5.6 Extended Update Support.
The Red Hat Security Response Team has rated this update as having moderate
security impact. A Common Vulnerability Scoring System (CVSS) base score,
which gives a detailed severity rating, is available from the CVE link in
the References section.
Details
The kernel packages contain the Linux kernel.
Security fix:
* A flaw in skb_gro_header_slow() in the Linux kernel could lead to GRO
(Generic Receive Offload) fields being left in an inconsistent state. An
attacker on the local network could use this flaw to trigger a denial of
service. (CVE-2011-2723, Moderate)
Red Hat would like to thank Brent Meshier for reporting this issue.
Bug fixes:
* When reading a file from a subdirectory in /proc/bus/pci/ while
hot-unplugging the device related to that file, the system will crash. Now,
the kernel correctly handles the simultaneous removal of a device and
access to the representation of that device in the proc file system.
(BZ#713454)
* RHSA-2011:0017 introduced a regression: Non-disk SCSI devices (except for
tape drives) such as enclosure or CD-ROM devices were hidden when attached
to a SAS based RAID controller that uses the megaraid_sas driver. With this
update, such devices are accessible, as expected. (BZ#726487)
* The fix for CVE-2010-3432 provided in RHSA-2011:0004 introduced a
regression: Information in sctp_packet_config(), which was called before
appending data chunks to a packet, was not reset, causing considerably poor
SCTP (Stream Control Transmission Protocol) performance. With this update,
the packet information is reset after transmission. (BZ#727591)
* Certain systems do not correctly set the ACPI FADT APIC mode bit. They
set the bit to "cluster" mode instead of "physical" mode which caused these
systems to boot without the TSC (Time Stamp Counter). With this update, the
ACPI FADT check has been removed due to its unreliability. (BZ#728162)
* Performance when invalidating and rereading cached data as a glock moves
around the cluster with GFS2 is improved. (BZ#729082)
* Performance issues occurred when multiple nodes attempted to call mmap()
on the same inode at the same time on a GFS2 file system, as it was using
an exclusive glock. With this update, a shared lock is used when "noatime"
is set on the mount, allowing mmap() operations to occur in parallel,
fixing this bug. Note that this issue only refers to mmap() system calls,
and not to subsequent page faults. (BZ#729090)
* Some of the functions in the GFS2 file system were not reserving enough
space for the resource group header in a transaction and for resource
groups bit blocks that get added when a memory allocation is performed.
That resulted in failed write and allocation operations. With this update,
GFS2 makes sure to reserve space in the described scenario, using the new
gfs2_rg_blocks() inline function. (BZ#729092)
* When GFS2 grew the file system, it never reread the rindex file during
the grow. This is necessary for large grows when the file system is almost
full, and GFS2 needs to use some of the space allocated earlier in the grow
to complete it. Now, if GFS2 fails to reserve the necessary space and the
rindex data is not up-to-date, it rereads it. (BZ#729094)
* Previously, when the Xen hypervisor split a 2 MB page into 4 KB pages, it
linked the new page from 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. (BZ#730684)
* Changes made to TSC as a clock source for IRQs caused virtual machines
running under the VMware ESX or ESXi hypervisors to become unresponsive
during the initial kernel boot process. With this update, the
enable_tsc_timer flag enables the do_timer_tsc_timekeeping() function to be
called in the do_timer_interrupt_hook() function, preventing a deadlock in
the timer interrupt handler. (BZ#730688)
Users should upgrade to these updated packages, which contain backported
patches to correct these issues. The system must be rebooted for this
update to take effect.
Terms of Use
This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
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"text": "The kernel packages contain the Linux kernel.\n\nSecurity fix:\n\n* A flaw in skb_gro_header_slow() in the Linux kernel could lead to GRO\n(Generic Receive Offload) fields being left in an inconsistent state. An\nattacker on the local network could use this flaw to trigger a denial of\nservice. (CVE-2011-2723, Moderate)\n\nRed Hat would like to thank Brent Meshier for reporting this issue.\n\nBug fixes:\n\n* When reading a file from a subdirectory in /proc/bus/pci/ while\nhot-unplugging the device related to that file, the system will crash. Now,\nthe kernel correctly handles the simultaneous removal of a device and\naccess to the representation of that device in the proc file system.\n(BZ#713454)\n\n* RHSA-2011:0017 introduced a regression: Non-disk SCSI devices (except for\ntape drives) such as enclosure or CD-ROM devices were hidden when attached\nto a SAS based RAID controller that uses the megaraid_sas driver. With this\nupdate, such devices are accessible, as expected. (BZ#726487)\n\n* The fix for CVE-2010-3432 provided in RHSA-2011:0004 introduced a\nregression: Information in sctp_packet_config(), which was called before\nappending data chunks to a packet, was not reset, causing considerably poor\nSCTP (Stream Control Transmission Protocol) performance. With this update,\nthe packet information is reset after transmission. (BZ#727591)\n\n* Certain systems do not correctly set the ACPI FADT APIC mode bit. They\nset the bit to \"cluster\" mode instead of \"physical\" mode which caused these\nsystems to boot without the TSC (Time Stamp Counter). With this update, the\nACPI FADT check has been removed due to its unreliability. (BZ#728162)\n\n* Performance when invalidating and rereading cached data as a glock moves\naround the cluster with GFS2 is improved. (BZ#729082)\n\n* Performance issues occurred when multiple nodes attempted to call mmap()\non the same inode at the same time on a GFS2 file system, as it was using\nan exclusive glock. With this update, a shared lock is used when \"noatime\"\nis set on the mount, allowing mmap() operations to occur in parallel,\nfixing this bug. Note that this issue only refers to mmap() system calls,\nand not to subsequent page faults. (BZ#729090)\n\n* Some of the functions in the GFS2 file system were not reserving enough\nspace for the resource group header in a transaction and for resource\ngroups bit blocks that get added when a memory allocation is performed.\nThat resulted in failed write and allocation operations. With this update,\nGFS2 makes sure to reserve space in the described scenario, using the new\ngfs2_rg_blocks() inline function. (BZ#729092)\n\n* When GFS2 grew the file system, it never reread the rindex file during\nthe grow. This is necessary for large grows when the file system is almost\nfull, and GFS2 needs to use some of the space allocated earlier in the grow\nto complete it. Now, if GFS2 fails to reserve the necessary space and the\nrindex data is not up-to-date, it rereads it. (BZ#729094)\n\n* Previously, when the Xen hypervisor split a 2 MB page into 4 KB pages, it\nlinked the new page from PDE (Page Directory Entry) before it filled\nentries of the page with appropriate data. Consequently, when doing a live\nmigration with EPT (Extended Page Tables) enabled on a non-idle guest\nrunning with more than two virtual CPUs, the guest often terminated\nunexpectedly. With this update, the Xen hypervisor prepares the page table\nentry first, and then links it in. (BZ#730684)\n\n* Changes made to TSC as a clock source for IRQs caused virtual machines\nrunning under the VMware ESX or ESXi hypervisors to become unresponsive\nduring the initial kernel boot process. With this update, the\nenable_tsc_timer flag enables the do_timer_tsc_timekeeping() function to be\ncalled in the do_timer_interrupt_hook() function, preventing a deadlock in\nthe timer interrupt handler. (BZ#730688)\n\nUsers should upgrade to these updated packages, which contain backported\npatches to correct these issues. The system must be rebooted for this\nupdate to take effect.",
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]
}
],
"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "kernel: gro: only reset frag0 when skb can be pulled"
}
]
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.