[PATCH 0/2] x86: Support shstk via prctl

[Bill Roberts <bill.roberts@arm.com>]

The motivation for having a common interface between x86 and others is:
1. Common permission checking for an LSM (future patches)
2. Common userspace

This leaves the arch_prctl interface intact, so older userspaces will
continue to work. However, for item 1, when we introduce LSM hooks, they
will need to reside on both the prctl and arch_prctl interfaces but will
both call into the LSM with all of the same permission bits and checks.

The SE Linux patches will follow these, after I address any feedback on
these patches, since they can stand alone.

Bill Roberts (2):
  x86/shstk: support via prctl
  selftests/x86: add generic prctl shadow stack test

 arch/x86/kernel/shstk.c                       | 35 ++++++++++++
 tools/testing/selftests/x86/Makefile          |  3 +-
 .../testing/selftests/x86/test_shadow_stack.c | 55 +++++++++++++++----
 .../selftests/x86/test_shadow_stack_prctl.c   |  3 +
 4 files changed, 85 insertions(+), 11 deletions(-)
 create mode 100644 tools/testing/selftests/x86/test_shadow_stack_prctl.c

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2.54.0