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Synopsis:          Important: kernel security and bug fix update
Advisory ID:       SLSA-2017:1723-1
Issue Date:        2017-07-11
CVE Numbers:       CVE-2017-7895
--

Security Fix(es):

* The NFSv2 and NFSv3 server implementations in the Linux kernel through
4.10.13 lacked certain checks for the end of a buffer. A remote attacker
could trigger a pointer-arithmetic error or possibly cause other
unspecified impacts using crafted requests related to fs/nfsd/nfs3xdr.c
and fs/nfsd/nfsxdr.c. (CVE-2017-7895, Important)

Bug Fix(es):

* If several file operations were started after a mounted NFS share had
got idle and its Transmission Control Protocol (TCP) connection had
therefore been terminated, these operations could cause multiple TCP SYN
packets coming from the NFS client instead of one. With this update, the
reconnection logic has been fixed, and only one TCP SYN packet is now sent
in the described situation.

* When the ixgbe driver was loaded for a backplane-connected network card,
a kernel panic could occur, because the ops.setup_fc function pointer was
used before the initialization. With this update, ops.setup_fc is
initialized earlier. As a result, ixgbe no longer panics on load.

* When setting an Access Control List (ACL) with 190 and more Access
Control Entries (ACEs) on a NFSv4 directory, a kernel crash could
previously occur. This update fixes the nfs4_getfacl() function, and the
kernel no longer crashes under the described circumstances.

* When upgrading to kernel with the fix for stack guard flaw, a crash
could occur in Java Virtual Machine (JVM) environments, which attempted to
implement their own stack guard page. With this update, the underlying
source code has been fixed to consider the PROT_NONE mapping as a part of
the stack, and the crash in JVM no longer occurs under the described
circumstances.

* When a program receives IPv6 packets using the raw socket, the
ioctl(FIONREAD) and ioctl(SIOCINQ) functions can incorrectly return zero
waiting bytes. This update fixes the ip6_input_finish() function to check
the raw payload size properly. As a result, the ioctl() function now
returns bytes waiting in the raw socket correctly.

* Previously, listing a directory on a non-standard XFS filesystem (with
non-default multi-fsb directory blocks) could lead to a soft lock up due
to array index overrun in the xfs_dir2_leaf_readbuf() function. This
update fixes xfs_dir2_leaf_readbuf(), and the soft lock up no longer
occurs under the described circumstances.

* Previously, aborts from the array after the Storage Area Network (SAN)
fabric back-pressure led to premature reuse of still valid sequence with
the same OX_ID. Consequently, an error message and data corruption could
occur. This update fixes the libfc driver to isolate the timed out OX_IDs,
thus fixing this bug.

* Previously, a kernel panic occurred when the mcelog daemon executed a
huge page memory offline. This update fixes the HugeTLB feature of the
Linux kernel to check for the Page Table Entry (PTE) NULL pointer in the
page_check_address() function. As a result, the kernel panic no longer
occurs under the described circumstances.
--

SL6
  x86_64
    kernel-2.6.32-696.6.3.el6.x86_64.rpm
    kernel-debug-2.6.32-696.6.3.el6.x86_64.rpm
    kernel-debug-debuginfo-2.6.32-696.6.3.el6.i686.rpm
    kernel-debug-debuginfo-2.6.32-696.6.3.el6.x86_64.rpm
    kernel-debug-devel-2.6.32-696.6.3.el6.i686.rpm
    kernel-debug-devel-2.6.32-696.6.3.el6.x86_64.rpm
    kernel-debuginfo-2.6.32-696.6.3.el6.i686.rpm
    kernel-debuginfo-2.6.32-696.6.3.el6.x86_64.rpm
    kernel-debuginfo-common-i686-2.6.32-696.6.3.el6.i686.rpm
    kernel-debuginfo-common-x86_64-2.6.32-696.6.3.el6.x86_64.rpm
    kernel-devel-2.6.32-696.6.3.el6.x86_64.rpm
    kernel-headers-2.6.32-696.6.3.el6.x86_64.rpm
    perf-2.6.32-696.6.3.el6.x86_64.rpm
    perf-debuginfo-2.6.32-696.6.3.el6.i686.rpm
    perf-debuginfo-2.6.32-696.6.3.el6.x86_64.rpm
    python-perf-debuginfo-2.6.32-696.6.3.el6.i686.rpm
    python-perf-debuginfo-2.6.32-696.6.3.el6.x86_64.rpm
    python-perf-2.6.32-696.6.3.el6.x86_64.rpm
  i386
    kernel-2.6.32-696.6.3.el6.i686.rpm
    kernel-debug-2.6.32-696.6.3.el6.i686.rpm
    kernel-debug-debuginfo-2.6.32-696.6.3.el6.i686.rpm
    kernel-debug-devel-2.6.32-696.6.3.el6.i686.rpm
    kernel-debuginfo-2.6.32-696.6.3.el6.i686.rpm
    kernel-debuginfo-common-i686-2.6.32-696.6.3.el6.i686.rpm
    kernel-devel-2.6.32-696.6.3.el6.i686.rpm
    kernel-headers-2.6.32-696.6.3.el6.i686.rpm
    perf-2.6.32-696.6.3.el6.i686.rpm
    perf-debuginfo-2.6.32-696.6.3.el6.i686.rpm
    python-perf-debuginfo-2.6.32-696.6.3.el6.i686.rpm
    python-perf-2.6.32-696.6.3.el6.i686.rpm
  noarch
    kernel-abi-whitelists-2.6.32-696.6.3.el6.noarch.rpm
    kernel-doc-2.6.32-696.6.3.el6.noarch.rpm
    kernel-firmware-2.6.32-696.6.3.el6.noarch.rpm

- Scientific Linux Development Team