An updated gcc that supports this option is scheduled for publication on Tuesday.

Pat

On 03/08/2018 11:46 AM, Gilles Detillieux wrote:
I realize this problem was likely introduced by upsteam updates, but I thought I'd point it out here anyway so you're aware of it. An unintended consequence of this latest kernel update is that it breaks recompilation of third-party kernel modules. The new kernel was built with CONFIG_RETPOLINE enabled, so presumably with a compiler that supports it, but that updated compiler hasn't been released through a corresponding security ERRATA update. (Not yet, anyway.) When I try to build a third-party device driver, I get the following error:

make[1]: Entering directory `/usr/src/kernels/3.10.0-693.21.1.el7.x86_64'
arch/x86/Makefile:166: *** CONFIG_RETPOLINE=y, but not supported by the compiler. Toolchain update recommended..  Stop.
make[1]: Leaving directory `/usr/src/kernels/3.10.0-693.21.1.el7.x86_64'
make: *** [default] Error 2

Is an update of the compiler toolchain for RHEL7/SL7 through the usual update repos forthcoming? Until then, I don't think I can use this kernel update on systems that rely on that 3rd party driver.

Thanks,
Gilles

On 2018-03-07 16:16, Pat Riehecky wrote:
Synopsis:          Important: kernel security and bug fix update
Advisory ID:       SLSA-2018:0395-1
Issue Date:        2018-03-06
CVE Numbers:       CVE-2017-7518
                    CVE-2017-12188
--

Security Fix(es):

* Kernel: KVM: MMU potential stack buffer overrun during page walks
(CVE-2017-12188, Important)

* Kernel: KVM: debug exception via syscall emulation (CVE-2017-7518,
Moderate)
--

SL7
   x86_64
     kernel-3.10.0-693.21.1.el7.x86_64.rpm
     kernel-debug-3.10.0-693.21.1.el7.x86_64.rpm
     kernel-debug-debuginfo-3.10.0-693.21.1.el7.x86_64.rpm
     kernel-debug-devel-3.10.0-693.21.1.el7.x86_64.rpm
     kernel-debuginfo-3.10.0-693.21.1.el7.x86_64.rpm
kernel-debuginfo-common-x86_64-3.10.0-693.21.1.el7.x86_64.rpm
     kernel-devel-3.10.0-693.21.1.el7.x86_64.rpm
     kernel-headers-3.10.0-693.21.1.el7.x86_64.rpm
     kernel-tools-3.10.0-693.21.1.el7.x86_64.rpm
     kernel-tools-debuginfo-3.10.0-693.21.1.el7.x86_64.rpm
     kernel-tools-libs-3.10.0-693.21.1.el7.x86_64.rpm
     perf-3.10.0-693.21.1.el7.x86_64.rpm
     perf-debuginfo-3.10.0-693.21.1.el7.x86_64.rpm
     python-perf-3.10.0-693.21.1.el7.x86_64.rpm
     python-perf-debuginfo-3.10.0-693.21.1.el7.x86_64.rpm
     kernel-tools-libs-devel-3.10.0-693.21.1.el7.x86_64.rpm
   noarch
     kernel-abi-whitelists-3.10.0-693.21.1.el7.noarch.rpm
     kernel-doc-3.10.0-693.21.1.el7.noarch.rpm

- Scientific Linux Development Team


--
Pat Riehecky

Fermi National Accelerator Laboratory
www.fnal.gov
www.scientificlinux.org

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