Updated kernel packages that fix multiple security issues and two bugs 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 in the References section.

The kernel packages contain the Linux kernel, the core of any Linux operating system.

This update fixes the following security issues :

* Using the SG_IO ioctl to issue SCSI requests to partitions or LVM volumes resulted in the requests being passed to the underlying block device. If a privileged user only had access to a single partition or LVM volume, they could use this flaw to bypass those restrictions and gain read and write access (and be able to issue other SCSI commands) to the entire block device. Refer to Red Hat Knowledgebase article DOC-67874, linked to in the References, for further details about this issue. (CVE-2011-4127, Important)

* A flaw was found in the way the Linux kernel handled robust list pointers of user-space held futexes across exec() calls. A local, unprivileged user could use this flaw to cause a denial of service or, eventually, escalate their privileges. (CVE-2012-0028, Important)

* A flaw was found in the Linux kernel in the way splitting two extents in ext4_ext_convert_to_initialized() worked. A local, unprivileged user with the ability to mount and unmount ext4 file systems could use this flaw to cause a denial of service.
(CVE-2011-3638, Moderate)

* A flaw was found in the way the Linux kernel's journal_unmap_buffer() function handled buffer head states. On systems that have an ext4 file system with a journal mounted, a local, unprivileged user could use this flaw to cause a denial of service.
(CVE-2011-4086, Moderate)

* A divide-by-zero flaw was found in the Linux kernel's igmp_heard_query() function. An attacker able to send certain IGMP (Internet Group Management Protocol) packets to a target system could use this flaw to cause a denial of service. (CVE-2012-0207, Moderate)

Red Hat would like to thank Zheng Liu for reporting CVE-2011-3638, and Simon McVittie for reporting CVE-2012-0207.

This update also fixes the following bugs :

* When a host was in recovery mode and a SCSI scan operation was initiated, the scan operation failed and provided no error output.
This bug has been fixed and the SCSI layer now waits for recovery of the host to complete scan operations for devices. (BZ#772162)

* SG_IO ioctls were not implemented correctly in the Red Hat Enterprise Linux 5 virtio-blk driver. Sending an SG_IO ioctl request to a virtio-blk disk caused the sending thread to enter an uninterruptible sleep state ('D' state). With this update, SG_IO ioctls are rejected by the virtio-blk driver: the ioctl system call will simply return an ENOTTY ('Inappropriate ioctl for device') error and the thread will continue normally. (BZ#773322)

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.

A bug was discovered in the Linux kernel's calculation of OOM (Out of memory) scores, that would result in the wrong process being killed. A user could use this to kill the process with the highest OOM score, even if that process belongs to another user or the system.
(CVE-2011-4097)

Paolo Bonzini discovered a flaw in Linux's handling of the SG_IO ioctl command. A local user, or user in a VM could exploit this flaw to bypass restrictions and gain read/write access to all data on the affected block device. (CVE-2011-4127)

A flaw was found in KVM's Programmable Interval Timer (PIT). When a virtual interrupt control is not available a local user could use this to cause a denial of service by starting a timer. (CVE-2011-4622)

A flaw was discovered in the XFS filesystem. If a local user mounts a specially crafted XFS image it could potential execute arbitrary code on the system. (CVE-2012-0038)

Andy Whitcroft discovered a that the Overlayfs filesystem was not doing the extended permission checks needed by cgroups and Linux Security Modules (LSMs). A local user could exploit this to by-pass security policy and access files that should not be accessible.
(CVE-2012-0055)

A flaw was found in the linux kernels IPv4 IGMP query processing. A remote attacker could exploit this to cause a denial of service.
(CVE-2012-0207)

A flaw was found in the Linux kernel's ext4 file system when mounting a corrupt filesystem. A user-assisted remote attacker could exploit this flaw to cause a denial of service. (CVE-2012-2100).

Note that Tenable Network Security has extracted the preceding description block directly from the Ubuntu security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

This kernel update of the openSUSE 12.1 kernel fixes lots of bugs and security issues.

Following issues were fixed :

  - tcp: drop SYN+FIN messages (bnc#765102).

  - net: sock: validate data_len before allocating skb in     sock_alloc_send_pskb() (bnc#765320, CVE-2012-2136).

  - fcaps: clear the same personality flags as suid when     fcaps are used (bnc#758260 CVE-2012-2123).

  - macvtap: zerocopy: validate vectors before building skb     (bnc#758243 CVE-2012-2119).

  - hfsplus: Fix potential buffer overflows (bnc#760902     CVE-2009-4020).

  - xfrm: take net hdr len into account for esp payload size     calculation (bnc#759545).

  - ext4: fix undefined behavior in ext4_fill_flex_info()     (bnc#757278).

  - igb: fix rtnl race in PM resume path (bnc#748859).

  - ixgbe: add missing rtnl_lock in PM resume path     (bnc#748859).

  - b43: allocate receive buffers big enough for max frame     len + offset (bnc#717749).

  - xenbus: Reject replies with payload >     XENSTORE_PAYLOAD_MAX.

  - xenbus_dev: add missing error checks to watch handling.

  - hwmon: (coretemp-xen) Fix TjMax detection for older     CPUs.

  - hwmon: (coretemp-xen) Relax target temperature range     check.

  - Refresh other Xen patches.

  - tlan: add cast needed for proper 64 bit operation     (bnc#756840).

  - dl2k: Tighten ioctl permissions (bnc#758813).

  - [media] cx22702: Fix signal strength.

  - fs: cachefiles: Add support for large files in     filesystem caching (bnc#747038).

  - bridge: correct IPv6 checksum after pull (bnc#738644).

  - bridge: fix a possible use after free (bnc#738644).

  - bridge: Pseudo-header required for the checksum of     ICMPv6 (bnc#738644).

  - bridge: mcast snooping, fix length check of snooped     MLDv1/2 (bnc#738644).

  - PCI/ACPI: Report ASPM support to BIOS if not disabled     from command line (bnc#714455).

  - ipc/sem.c: fix race with concurrent semtimedop()     timeouts and IPC_RMID (bnc#756203).

  - drm/i915/crt: Remove 0xa0 probe for VGA.

  - tty_audit: fix tty_audit_add_data live lock on audit     disabled (bnc#721366).

  - drm/i915: suspend fbdev device around suspend/hibernate     (bnc#732908).

  - dlm: Do not allocate a fd for peeloff (bnc#729247).

  - sctp: Export sctp_do_peeloff (bnc#729247).

  - i2c-algo-bit: Fix spurious SCL timeouts under heavy     load.

  - patches.fixes/epoll-dont-limit-non-nested.patch: Don't     limit non-nested epoll paths (bnc#676204).

  - Update patches.suse/sd_init.mark_majors_busy.patch     (bnc#744658).

  - igb: Fix for Alt MAC Address feature on 82580 and later     devices (bnc#746980).

  - mark busy sd majors as allocated (bug#744658).

  - regset: Return -EFAULT, not -EIO, on host-side memory     fault (bnc# 750079 CVE-2012-1097).

  - regset: Prevent NULL pointer reference on readonly     regsets (bnc#750079 CVE-2012-1097).

  - mm: memcg: Correct unregistring of events attached to     the same eventfd (CVE-2012-1146 bnc#750959).

  - befs: Validate length of long symbolic links     (CVE-2011-2928 bnc#713430).

  - si4713-i2c: avoid potential buffer overflow on si4713     (CVE-2011-2700 bnc#707332).

  - staging: comedi: fix infoleak to userspace     (CVE-2011-2909 bnc#711941).

  - hfs: add sanity check for file name length     (CVE-2011-4330 bnc#731673).

  - cifs: fix dentry refcount leak when opening a FIFO on     lookup (CVE-2012-1090 bnc#749569).

  - drm: integer overflow in drm_mode_dirtyfb_ioctl()     (CVE-2012-0044 bnc#740745).

  - xfs: fix acl count validation in xfs_acl_from_disk()     (CVE-2012-0038 bnc#740703).

  - xfs: validate acl count (CVE-2012-0038 bnc#740703).

  -     patches.fixes/xfs-fix-possible-memory-corruption-in-xfs_     readlink: Work around missing xfs_alert().

  - xfs: Fix missing xfs_iunlock() on error recovery path in     xfs_readlink() (CVE-2011-4077 bnc#726600).

  - xfs: Fix possible memory corruption in xfs_readlink     (CVE-2011-4077 bnc#726600).

  - ext4: make ext4_split_extent() handle error correctly.

  - ext4: ext4_ext_convert_to_initialized bug found in     extended FSX testing.

  - ext4: add ext4_split_extent_at() and     ext4_split_extent().

  - ext4: reimplement convert and split_unwritten     (CVE-2011-3638 bnc#726045).

  - patches.fixes/epoll-limit-paths.patch: epoll: limit     paths (bnc#676204 CVE-2011-1083).

  - patches.kabi/epoll-kabi-fix.patch: epoll: hide kabi     change in struct file (bnc#676204 CVE-2011-1083).

  - NAT/FTP: Fix broken conntrack (bnc#681639 bnc#466279     bnc#747660).

  - igmp: Avoid zero delay when receiving odd mixture of     IGMP queries (bnc#740448 CVE-2012-0207).

  - jbd2: clear BH_Delay & BH_Unwritten in     journal_unmap_buffer (bnc#745832 CVE-2011-4086).

  - AppArmor: fix oops in apparmor_setprocattr (bnc#717209     CVE-2011-3619).

  - Refresh patches.suse/SoN-22-netvm.patch. Clean and
    *working* patches.

  - Refresh patches.suse/SoN-22-netvm.patch. (bnc#683671)     Fix an rcu locking imbalance in the receive path     triggered when using vlans.

  - Fix mangled patch (invalid date) Although accepted by     `patch`, this is rejected by `git apply`

  - Fix mangled diff lines (leading space tab vs tab)     Although accepted by `patch`, these are rejected by `git     apply`

  - jbd/jbd2: validate sb->s_first in     journal_get_superblock() (bnc#730118).

  - fsnotify: don't BUG in fsnotify_destroy_mark()     (bnc#689860).

  - Fix     patches.fixes/x25-Handle-undersized-fragmented-skbs.patc     h (CVE-2010-3873 bnc#651219).

  - Fix     patches.fixes/x25-Prevent-skb-overreads-when-checking-ca     ll-user-da.patch (CVE-2010-3873 bnc#651219).

  - Fix     patches.fixes/x25-Validate-incoming-call-user-data-lengt     hs.patch (CVE-2010-3873 bnc#651219).

  - Fix     patches.fixes/x25-possible-skb-leak-on-bad-facilities.pa     tch (CVE-2010-3873 bnc#651219 CVE-2010-4164 bnc#653260).

  - Update     patches.fixes/econet-4-byte-infoleak-to-the-network.patc     h (bnc#681186 CVE-2011-1173). Fix reference.

  - hwmon: (w83627ehf) Properly report thermal diode     sensors.

  - nl80211: fix overflow in ssid_len (bnc#703410     CVE-2011-2517).

  - nl80211: fix check for valid SSID size in scan     operations (bnc#703410 CVE-2011-2517).

  - x25: Prevent skb overreads when checking call user data     (CVE-2010-3873 bnc#737624).

  - x25: Handle undersized/fragmented skbs (CVE-2010-3873     bnc#737624).

  - x25: Validate incoming call user data lengths     (CVE-2010-3873 bnc#737624).

  - x25: possible skb leak on bad facilities (CVE-2010-3873     bnc#737624).

  - net: Add a flow_cache_flush_deferred function     (bnc#737624).

  - xfrm: avoid possible oopse in xfrm_alloc_dst     (bnc#737624).

  - scm: lower SCM_MAX_FD (bnc#655696 CVE-2010-4249).

Updated kernel-rt packages that fix multiple security issues and various bugs are now available for Red Hat Enterprise MRG 2.1.

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 in the References section.

These packages contain the Linux kernel.

Security fixes :

* SG_IO ioctl SCSI requests on partitions or LVM volumes could be passed to the underlying block device, allowing a privileged user to bypass restrictions and gain read and write access (and be able to issue other SCSI commands) to the entire block device. (CVE-2011-4127, Important)

* A local, unprivileged user could use an integer overflow flaw in drm_mode_dirtyfb_ioctl() to cause a denial of service or escalate their privileges. (CVE-2012-0044, Important)

* A local, unprivileged user could use a flaw in the Performance Events implementation to cause a denial of service. (CVE-2011-2918, Moderate)

* A local, unprivileged user could use flaws in the XFS file system implementation to cause a denial of service or escalate their privileges by mounting a specially crafted disk. (CVE-2011-4077, CVE-2012-0038, Moderate)

* A local, unprivileged user could use a flaw in the Out of Memory (OOM) killer to monopolize memory, have their process skipped by the OOM killer, or cause other tasks to be terminated. (CVE-2011-4097, Moderate)

* A local, unprivileged user could use a flaw in the key management facility to cause a denial of service. (CVE-2011-4110, Moderate)

* A malicious Network File System version 4 (NFSv4) server could return a crafted reply to a GETACL request, causing a denial of service on the client. (CVE-2011-4131, Moderate)

* A local attacker could use a flaw in the Journaling Block Device (JBD) to crash the system by mounting a specially crafted ext3 or ext4 disk. (CVE-2011-4132, Moderate)

* A flaw in igmp_heard_query() could allow an attacker, who is able to send certain IGMP (Internet Group Management Protocol) packets to a target system, to cause a denial of service. (CVE-2012-0207, Moderate)

* If lock contention during signal sending occurred when in a software interrupt handler that is using the per-CPU debug stack, the task could be scheduled out on the realtime kernel, possibly leading to debug stack corruption. A local, unprivileged user could use this flaw to cause a denial of service. (CVE-2012-0810, Moderate)

Red Hat would like to thank Chen Haogang for reporting CVE-2012-0044;
Wang Xi for reporting CVE-2012-0038; Shubham Goyal for reporting CVE-2011-4097; Andy Adamson for reporting CVE-2011-4131; and Simon McVittie for reporting CVE-2012-0207.

Bug fixes :

* When a sleeping task, waiting on a futex (fast userspace mutex), tried to get the spin_lock(hb->lock) RT-mutex, if the owner of the futex released the lock, the sleeping task was put on a futex proxy lock. Consequently, the sleeping task was blocked on two locks and eventually terminated in the BUG_ON() function. With this update, the WAKEUP_INPROGRESS pseudo-lock has been added to be used as a proxy lock. This pseudo-lock tells the sleeping task that it is being woken up so that the task no longer tries to get the second lock. Now, the futex code works as expected and sleeping tasks no longer crash in the described scenario. (BZ#784733)

* When the CONFIG_CRYPTO_FIPS configuration option was disabled, some services such as sshd and ipsec, while working properly, returned warning messages regarding this missing option during start up. With this update, CONFIG_CRYPTO_FIPS has been enabled and no warning messages are now returned in the described scenario. (BZ#786145)

* Previously, when a read operation on a loop device failed, the data successfully read from the device was not cleared and could eventually leak. This bug has been fixed and all data are now properly cleared in the described scenario. (BZ#761420)

* Due to an assembler-sourced object, the perf utility (from the perf-rt package) for AMD64 and Intel 64 architectures contained an executable stack. This update adds the '.note.GNU-stack' section definition to the bench/mem-memcpy-x86-64-asm.S component of perf, with all flags disabled, and perf no longer contains an executable stack, thus fixing this bug. (BZ#783570)

ID	名称	产品	系列	发布时间	最近更新时间	严重程度
57922	CentOS 5 : kernel (CESA-2012:0107)	Nessus	CentOS Local Security Checks	2012/2/14	2021/1/4	high
58265	Ubuntu 10.04 LTS : linux-lts-backport-oneiric vulnerabilities (USN-1384-1)	Nessus	Ubuntu Local Security Checks	2012/3/7	2020/3/2	high
74658	openSUSE Security Update : Kernel (openSUSE-SU-2012:0799-1)	Nessus	SuSE Local Security Checks	2014/6/13	2021/1/19	critical
76639	RHEL 6 : MRG (RHSA-2012:0333)	Nessus	Red Hat Local Security Checks	2014/7/22	2021/1/14	medium

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