SUSE-SU-2018:1374-1

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SUSE-SU-2018:1374-1

Summary: Security update for the Linux Kernel

Details: The SUSE Linux Enterprise 12 GA LTSS kernel was updated to receive several security fixes. The following security bugs were 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' - CVE-2018-1000199: An address corruption flaw was discovered while modifying a h/w breakpoint via 'modify_user_hw_breakpoint' routine, an unprivileged user/process could use this flaw to crash the system kernel resulting in DoS OR to potentially escalate privileges on a the system. (bsc#1089895) - CVE-2018-10675: The do_get_mempolicy function in mm/mempolicy.c allowed local users to cause a denial of service (use-after-free) or possibly have unspecified other impact via crafted system calls (bnc#1091755). The following non-security bugs were fixed: - x86/bugs: Make sure that _TIF_SSBD does not end up in _TIF_ALLWORK_MASK (bsc#1093215). - x86/bugs: correctly force-disable IBRS on !SKL systems (bsc#1092497). - x86/cpu/intel: Introduce macros for Intel family numbers (bsc#985025). - x86/cpu/intel: Introduce macros for Intel family numbers (bsc985025). - x86/speculation: Remove Skylake C2 from Speculation Control microcode blacklist (bsc#1087845).

References: https://www.suse.com/support/update/announcement/2018/suse-su-20181374-1/, https://bugzilla.suse.com/1087082, https://bugzilla.suse.com/1087845, https://bugzilla.suse.com/1089895, https://bugzilla.suse.com/1091755, https://bugzilla.suse.com/1092497, https://bugzilla.suse.com/1093215, https://bugzilla.suse.com/1094019, https://bugzilla.suse.com/985025, https://www.suse.com/security/cve/CVE-2018-1000199, https://www.suse.com/security/cve/CVE-2018-10675, https://www.suse.com/security/cve/CVE-2018-3639