[L1TF,MDS,GT,v4,0/2] grant table protection

Message

Norbert Manthey July 30, 2019, 1:15 p.m. UTC

Dear all,

This patch series attempts to mitigate the issue that have been raised in the
XSA-289 (https://xenbits.xen.org/xsa/advisory-289.html). To block speculative
execution on Intel hardware, an lfence instruction is required to make sure
that selected checks are not bypassed. Speculative out-of-bound accesses can
be prevented by using the array_index_nospec macro.

This series picks up the last remaining commit of my previous L1TF series, and
splits it into several commits to help targetting the discussion better. The
actual change is to protect grant-table code.

This is part of the speculative hardening effort.

Best,
Norbert

Norbert Manthey (2):
  common/grant_table: harden bound accesses
  common/grant_table: harden version dependent accesses

 xen/common/grant_table.c | 107 +++++++++++++++++++++++++++++++++--------------
 1 file changed, 75 insertions(+), 32 deletions(-)