x86/speculation/l1tf: Make pmd/pud_mknotpresent() invert

Browse source

Some cases in THP like:
  - MADV_FREE
  - mprotect
  - split

mark the PMD non present for temporarily to prevent races. The window for
an L1TF attack in these contexts is very small, but it wants to be fixed
for correctness sake.

Use the proper low level functions for pmd/pud_mknotpresent() to address
this.

Signed-off-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

...

This commit is contained in:

Andi Kleen 2018-08-07 15:09:37 -07:00 • committed by Thomas Gleixner

parent f22cc87f6c

commit 0768f91530

1 changed files with 12 additions and 10 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

22

arch/x86/include/asm/pgtable.h

View file