[Announce] Kernel RHEL6 042stab076.5 (moved to stable)

[Kir Kolyshkin]

OpenVZ project has released a new RHEL6 based stable kernel. Read below 
for more information. Everyone using this kernel branch is advised to 
upgrade.


Changes
=======
* [security] A flaw was found in the way the xen_iret() function in the 
Linux kernel used the DS (the CPU's Data Segment) register. A local, 
unprivileged user in a 32-bit, para-virtualized Xen hypervisor guest 
could use this flaw to crash the guest or, potentially, escalate their 
privileges. (CVE-2013-0228, Important)
* [security] A flaw was found in the way file permission checks for the 
"/dev/cpu/[x]/msr" files were performed in restricted root environments 
(for example, when using a capability-based security model). A local 
user with the ability to write to these files could use this flaw to 
escalate their privileges to kernel level, for example, by writing to 
the SYSENTER_EIP_MSR register. (CVE-2013-0268, Important)
* [nfs] redundant clear_inode() led to a memory corruption, which led to 
the kernel panic (PSBM-18863)
* [sunrpc] forgotten socket write lock in case rpc_task exists early, 
this caused all operations on NFS volume to hang (PCLIN-31604)
* [tmpfs] avoid the crash by not releasing the mempolicy if 
shmem_parse_options() doesn't create a new mpol by remounting without 
mpol= mount option (PSBM-18650)
* [ext4] container should not be able to remount ploop with mount option 
'errors=panic'
* [fs] forbid filesystem mount options (on remount inside a CT) if white 
list was not provided
* [cpt] 64bit child process of 32bit parent should report x86_64 arch 
even after vzreboot/online migration. This fixes Plesk functioning in 
particular after vzreboot/online migration (PSBM-18085)
* [cpt] if parent process has PER_LINUX32 and child has 0, it should 
stay the same way after cpt/rst. Before this fix cpt/rst cycle made 
PER_LINUX32 in both processes
* [pfcache] hide mount options 'pfcache_csum' and 'pfcache' inside a CT. 
They are useless inside a CT anyway and produces kernel warnings on 
remounts (PSBM-18807)
* [nfs/quota] fixed crash on a kernel compiled without NFS quota
* [scheduler] the effective cpulimit could be sometimes lower than 
assigned (PSBM-17399)
* [fs/nfsd] fixed mnt_{get/drop} balance, the imbalance could cause 
random memory corruptions (#2506)


Download
========
http://wiki.openvz.org/Download/kernel/rhel6/042stab076.5


Bug reporting
=============
Use http://bugzilla.openvz.org/ to report any bugs found.


Other sources of info on updates
================================
See http://wiki.openvz.org/News to view all the news (including updates)
online. There you can also find RSS feed links.


Best regards,
   OpenVZ team