[0/3] x86/asm: More pinning

Message

Kees Cook Feb. 26, 2019, 11:36 p.m. UTC

This adds CR0 pinning (for WP), and cleans up the CR4 pin to avoid
taking an exception from WARN before fixing up the desired pin.
Additionally adds lkdtm test (which depends on the CR4 patch, otherwise
I'd send it via Greg's tree).

Thanks!

-Kees

Kees Cook (3):
  x86/asm: Pin sensitive CR0 bits
  x86/asm: Avoid taking an exception before cr4 restore
  lkdtm: Check for SMEP clearing protections

 arch/x86/include/asm/special_insns.h | 33 +++++++++++++--
 drivers/misc/lkdtm/bugs.c            | 60 ++++++++++++++++++++++++++++
 drivers/misc/lkdtm/core.c            |  1 +
 drivers/misc/lkdtm/lkdtm.h           |  1 +
 4 files changed, 91 insertions(+), 4 deletions(-)

Comments

Greg KH Feb. 27, 2019, 8:20 a.m. UTC | #1

On Tue, Feb 26, 2019 at 03:36:44PM -0800, Kees Cook wrote:
> This adds CR0 pinning (for WP), and cleans up the CR4 pin to avoid
> taking an exception from WARN before fixing up the desired pin.
> Additionally adds lkdtm test (which depends on the CR4 patch, otherwise
> I'd send it via Greg's tree).

No objection from me to route around me, please do!

greg k-h