On Fri, Aug 18, 2017 at 05:27:48PM -0700, Ricardo Neri wrote: > Section 2.2.1.2 of the Intel 64 and IA-32 Architectures Software > Developer's Manual volume 2A states that if a SIB byte is used and > SIB.base is 101b and ModRM.mod is zero, then the base part of the base > part of the effective address computation is null. To signal this > situation, a -EDOM error is returned to indicate callers to ignore the > base value present in the register operand. > > In this scenario, a 32-bit displacement follows the SIB byte. Displacement > is obtained when the instruction decoder parses the operands. > > Cc: Borislav Petkov <[email protected]> > Cc: Andy Lutomirski <[email protected]> > Cc: Dave Hansen <[email protected]> > Cc: Adam Buchbinder <[email protected]> > Cc: Colin Ian King <[email protected]> > Cc: Lorenzo Stoakes <[email protected]> > Cc: Qiaowei Ren <[email protected]> > Cc: Peter Zijlstra <[email protected]> > Cc: Nathan Howard <[email protected]> > Cc: Adan Hawthorn <[email protected]> > Cc: Joe Perches <[email protected]> > Cc: Ravi V. Shankar <[email protected]> > Cc: [email protected] > Signed-off-by: Ricardo Neri <[email protected]> > --- > arch/x86/mm/mpx.c | 28 +++++++++++++++++++--------- > 1 file changed, 19 insertions(+), 9 deletions(-)
Reviewed-by: Borislav Petkov <[email protected]> -- Regards/Gruss, Boris. SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton, HRB 21284 (AG Nürnberg) --
