CentOS Linux Kernel Update 2.6.32-573.3.1 Released

CentOS 6 Linux kernel 2.6.32-573.3.1 has recently been released.

Update type(s): security and bugfix

Resolved CVEs:


* When removing a directory, and a reference was held to that directory by
a reference to a negative child dentry, the directory dentry was previously
not killed. In addition, once the negative child dentry was killed, an
unlinked and unused dentry was present in the cache. As a consequence,
deadlock could be caused by forcing the dentry eviction while the file
system in question was frozen. With this update, all unused dentries are
unhashed and evicted just after a successful directory removal, which
avoids the deadlock, and the system no longer hangs in the aforementioned
scenario. (BZ#1243400)

* Due to the broken s_umount lock ordering, a race condition occurred when
an unlinked file was closed and the sync (or syncfs) utility was run at the
same time. As a consequence, deadlock occurred on a frozen file system
between sync and a process trying to unfreeze the file system. With this
update, sync (or syncfs) is skipped on a frozen file system, and deadlock
no longer occurs in the aforementioned situation. (BZ#1243404)

* Previously, in the scenario when a file was opened by file handle
(fhandle) with its dentry not present in dcache (“cold dcache”) and then
making use of the unlink() and close() functions, the inode was not freed
upon the close() system call. As a consequence, the iput() final was
delayed indefinitely. A patch has been provided to fix this bug, and the
inode is now freed as expected. (BZ#1243406)

* Due to a corrupted Executable and Linkable Format (ELF) header in the
/proc/vmcore file, the kdump utility failed to provide any information.
The underlying source code has been patched, and kdump now provides
debuging information for kernel crashes as intended. (BZ#1245195)

* Previously, running the multipath request queue caused regressions in
cases where paths failed regularly under I/O load. This regression
manifested as I/O stalls that exceeded 300 seconds. This update reverts the
changes aimed to reduce running the multipath request queue resulting in
I/O stalls completing in a timely manner. (BZ#1246095)


Full details can be found here.

Updating the Kernel

You can either initiate a full yum update:

yum update
Alternatively, just update the kernel packages:
yum update "kernel-*"

Cached repo data can also prevent new updates from being found. To clear your yum cache, run:

yum clean all
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