SUSE Security Update: Security update for the Linux Kernel
______________________________________________________________________________
Announcement ID: SUSE-SU-2018:1377-2
Rating: important
References: #1056427 #1068032 #1075087 #1080157 #1087082
#1090953 #1091041 #1092289 #1093215 #1094019
Cross-References: CVE-2018-3639
Affected Products:
SUSE Linux Enterprise Server 12-SP2-BCL
______________________________________________________________________________
An update that solves one vulnerability and has 9 fixes is
now available.
Description:
The SUSE Linux Enterprise 12 SP2 LTSS kernel was updated to receive
various security and bugfixes.
The following security bug was fixed:
- CVE-2018-3639: Information leaks using "Memory Disambiguation"
feature
in modern CPUs were mitigated, aka "Spectre Variant 4"
(bnc#1087082).
A new boot commandline option was introduced,
"spec_store_bypass_disable", which can have following values:
- auto: Kernel detects whether your CPU model contains an implementation
of Speculative Store Bypass and picks the most appropriate mitigation.
- on: disable Speculative Store Bypass
- off: enable Speculative Store Bypass
- prctl: Control Speculative Store Bypass per thread via prctl.
Speculative Store Bypass is enabled for a process by default. The
state of the control is inherited on fork.
- seccomp: Same as "prctl" above, but all seccomp threads will
disable
SSB unless they explicitly opt out.
The default is "seccomp", meaning programs need explicit opt-in
into the
mitigation.
Status can be queried via the
/sys/devices/system/cpu/vulnerabilities/spec_store_bypass file, containing:
- "Vulnerable"
- "Mitigation: Speculative Store Bypass disabled"
- "Mitigation: Speculative Store Bypass disabled via prctl"
- "Mitigation: Speculative Store Bypass disabled via prctl and
seccomp"
The following related and non-security bugs were fixed:
- cpuid: Fix cpuid.edx.7.0 propagation to guest
- ext4: Fix hole length detection in ext4_ind_map_blocks() (bsc#1090953).
- ibmvnic: Clean actual number of RX or TX pools (bsc#1092289).
- kvm: Introduce nopvspin kernel parameter (bsc#1056427).
- kvm: Fix nopvspin static branch init usage (bsc#1056427).
- powerpc/64: Use barrier_nospec in syscall entry (bsc#1068032,
bsc#1080157).
- powerpc/64s: Add barrier_nospec (bsc#1068032, bsc#1080157).
- powerpc/64s: Add support for ori barrier_nospec patching (bsc#1068032,
bsc#1080157).
- powerpc/64s: Enable barrier_nospec based on firmware settings
(bsc#1068032, bsc#1080157).
- powerpc/64s: Enhance the information in cpu_show_meltdown()
(bsc#1068032, bsc#1075087, bsc#1091041).
- powerpc/64s: Enhance the information in cpu_show_spectre_v1()
(bsc#1068032).
- powerpc/64s: Fix section mismatch warnings from setup_rfi_flush()
(bsc#1068032, bsc#1075087, bsc#1091041).
- powerpc/64s: Move cpu_show_meltdown() (bsc#1068032, bsc#1075087,
bsc#1091041).
- powerpc/64s: Patch barrier_nospec in modules (bsc#1068032, bsc#1080157).
- powerpc/64s: Wire up cpu_show_spectre_v1() (bsc#1068032, bsc#1075087,
bsc#1091041).
- powerpc/64s: Wire up cpu_show_spectre_v2() (bsc#1068032, bsc#1075087,
bsc#1091041).
- powerpc/powernv: Set or clear security feature flags (bsc#1068032,
bsc#1075087, bsc#1091041).
- powerpc/powernv: Use the security flags in pnv_setup_rfi_flush()
(bsc#1068032, bsc#1075087, bsc#1091041).
- powerpc/pseries: Add new H_GET_CPU_CHARACTERISTICS flags (bsc#1068032,
bsc#1075087, bsc#1091041).
- powerpc/pseries: Fix clearing of security feature flags (bsc#1068032,
bsc#1075087, bsc#1091041).
- powerpc/pseries: Restore default security feature flags on setup
(bsc#1068032, bsc#1075087, bsc#1091041).
- powerpc/pseries: Set or clear security feature flags (bsc#1068032,
bsc#1075087, bsc#1091041).
- powerpc/pseries: Use the security flags in pseries_setup_rfi_flush()
(bsc#1068032, bsc#1075087, bsc#1091041).
- powerpc/rfi-flush: Always enable fallback flush on pseries (bsc#1068032,
bsc#1075087, bsc#1091041).
- powerpc/rfi-flush: Differentiate enabled and patched flush types
(bsc#1068032, bsc#1075087, bsc#1091041).
- powerpc/rfi-flush: Make it possible to call setup_rfi_flush() again
(bsc#1068032, bsc#1075087, bsc#1091041).
- powerpc: Add security feature flags for Spectre/Meltdown (bsc#1068032,
bsc#1075087, bsc#1091041).
- powerpc: Move default security feature flags (bsc#1068032, bsc#1075087,
bsc#1091041).
- powerpc: Use barrier_nospec in copy_from_user() (bsc#1068032,
bsc#1080157).
Special Instructions and Notes:
Please reboot the system after installing this update.
Patch Instructions:
To install this SUSE Security Update use the SUSE recommended installation
methods
like YaST online_update or "zypper patch".
Alternatively you can run the command listed for your product:
- SUSE Linux Enterprise Server 12-SP2-BCL:
zypper in -t patch SUSE-SLE-SERVER-12-SP2-BCL-2018-956=1
Package List:
- SUSE Linux Enterprise Server 12-SP2-BCL (noarch):
kernel-devel-4.4.121-92.80.1
kernel-macros-4.4.121-92.80.1
kernel-source-4.4.121-92.80.1
- SUSE Linux Enterprise Server 12-SP2-BCL (x86_64):
kernel-default-4.4.121-92.80.1
kernel-default-base-4.4.121-92.80.1
kernel-default-base-debuginfo-4.4.121-92.80.1
kernel-default-debuginfo-4.4.121-92.80.1
kernel-default-debugsource-4.4.121-92.80.1
kernel-default-devel-4.4.121-92.80.1
kernel-syms-4.4.121-92.80.1
kgraft-patch-4_4_121-92_80-default-1-3.5.2
References:
https://www.suse.com/security/cve/CVE-2018-3639.html
https://bugzilla.suse.com/1056427
https://bugzilla.suse.com/1068032
https://bugzilla.suse.com/1075087
https://bugzilla.suse.com/1080157
https://bugzilla.suse.com/1087082
https://bugzilla.suse.com/1090953
https://bugzilla.suse.com/1091041
https://bugzilla.suse.com/1092289
https://bugzilla.suse.com/1093215
https://bugzilla.suse.com/1094019
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