On Fri, Oct 27, 2017 at 01:25:45PM -0700, Ricardo Neri wrote: > insn_get_addr_ref() returns the effective address as defined by the > section 3.7.5.1 Vol 1 of the Intel 64 and IA-32 Architectures Software > Developer's Manual. In order to compute the linear address, we must add > to the effective address the segment base address as set in the segment > descriptor. The segment descriptor to use depends on the register used as > operand and segment override prefixes, if any. > > In most cases, the segment base address will be 0 if the USER_DS/USER32_DS > segment is used or if segmentation is not used. However, the base address > is not necessarily zero if a user programs defines its own segments. This > is possible by using a local descriptor table. > > Since the effective address is a signed quantity, the unsigned segment > base address is saved in a separate variable and added to the final, > unsigned, effective address. > > 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: Arnaldo Carvalho de Melo <[email protected]> > Cc: Masami Hiramatsu <[email protected]> > Cc: Adrian Hunter <[email protected]> > Cc: Kees Cook <[email protected]> > Cc: Thomas Garnier <[email protected]> > Cc: Peter Zijlstra <[email protected]> > Cc: Borislav Petkov <[email protected]> > Cc: Dmitry Vyukov <[email protected]> > Cc: Ravi V. Shankar <[email protected]> > Cc: [email protected] > Signed-off-by: Ricardo Neri <[email protected]> > --- > arch/x86/lib/insn-eval.c | 55 > +++++++++++++++++++++++++++++++++++++++++++++--- > 1 file changed, 52 insertions(+), 3 deletions(-)
Reviewed-by: Borislav Petkov <[email protected]> -- Regards/Gruss, Boris. SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton, HRB 21284 (AG Nürnberg) --
