[PATCHv3,0/3] Fix couple of issues with LDT remap for PTI

Message

Kirill A . Shutemov Oct. 26, 2018, 12:28 p.m. UTC

The patchset fixes issues with LDT remap for PTI:

 - Layout collision due to KASLR with 5-level paging;

 - Information leak via Meltdown-like attack;

Please review and consider applying.

v3:
 - Split out cleanup in map_ldt_struct() into a separate patch
v2:
 - Rebase to the Linus' tree
   + fix conflict with new documentation of kernel memory layout
   + fix few mistakes in layout documentation
 - Fix typo in commit message

Kirill A. Shutemov (3):
  x86/mm: Move LDT remap out of KASLR region on 5-level paging
  x86/ldt: Unmap PTEs for the slot before freeing LDT pages
  x86/ldt: Remove unused variable in map_ldt_struct()

 Documentation/x86/x86_64/mm.txt         | 34 +++++++-------
 arch/x86/include/asm/page_64_types.h    | 12 ++---
 arch/x86/include/asm/pgtable_64_types.h |  4 +-
 arch/x86/kernel/ldt.c                   | 59 ++++++++++++++++---------
 arch/x86/xen/mmu_pv.c                   |  6 +--
 5 files changed, 67 insertions(+), 48 deletions(-)