On Mon, Dec 04, 2017 at 03:07:38PM +0100, Thomas Gleixner wrote: > From: Dave Hansen <[email protected]> > > With KERNEL_PAGE_TABLE_ISOLATION the user portion of the kernel page > tables is poisoned with the NX bit so if the entry code exits with the > kernel page tables selected in CR3, userspace crashes. > > But doing so trips the p4d/pgd_bad() checks. Make sure it does not do > that. > > Signed-off-by: Dave Hansen <[email protected]> > Signed-off-by: Thomas Gleixner <[email protected]> > > --- > arch/x86/include/asm/pgtable.h | 14 ++++++++++++-- > 1 file changed, 12 insertions(+), 2 deletions(-)
Reviewed-by: Borislav Petkov <[email protected]> -- Regards/Gruss, Boris. SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton, HRB 21284 (AG Nürnberg) --
