On Fri, Mar 02, 2018 at 08:44:25PM +0100, Andrey Konovalov wrote: > KHWASAN uses the Top Byte Ignore feature of arm64 CPUs to store a pointer > tag in the top byte of each pointer. This commit enables the TCR_TBI1 bit, > which enables Top Byte Ignore for the kernel, when KHWASAN is used. > --- > arch/arm64/include/asm/pgtable-hwdef.h | 1 + > arch/arm64/mm/proc.S | 8 +++++++- > 2 files changed, 8 insertions(+), 1 deletion(-) Before it's safe to do this, I also think you'll need to fix up at least: * virt_to_phys() * access_ok() ... and potentially others which assume that bits [63:56] of kernel addresses are 0xff. For example, bits of the fault handling logic might need fixups. Thanks, Mark. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>
