SUSE-SU-2018:1377-2

Описание

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).