MGASA-2019-0414

This update is based on upstream 5.4.6 and fixes various potential security issues related to buffer overflows, double frees, NUll pointer dereferences, improper / missing input validations and so on. It also adds other bugfixes all over the kernel.

Other fixes added in this update:

• x86/MCE/AMD: Do not use rdmsr_safe_on_cpu() in smca_configure(), fixing an deadlock issue.
• x86/mm: Split vmalloc_sync_all(), fixing up big performance regressions in some x86_64 workloads (example: reaim.jobs_per_min -79.7% regression)
• The Intel cpu/gpu specific security fixes in upstream 5.3.11 broke RC6 and that prevents CPUs from entering C-states, causing higher power consumption. This update adds upstream fixes to restore RC6 to a working state (fdo#112315)
• radeon changes in upstream 5.4 to remove the 'need_dma32 flag' has been reverted as it caused radeon to malfunction on 32bit kernels
• iwlwifi fixes for firmware crashes (mga#25926), failures on warm reboot, and performance fixes

WireGuard has been updated to 0.0.20191219.

For other fixes in this update, see the referenced changelogs.