The current emulator implementation ignores the high 32 bits of the base in long-mode. During segment load from the LDT, the base of the LDT is calculated incorrectly and may cause the wrong segment to be loaded.
Signed-off-by: Nadav Amit <[email protected]> --- arch/x86/kvm/emulate.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c index 136088f..7e4a45c 100644 --- a/arch/x86/kvm/emulate.c +++ b/arch/x86/kvm/emulate.c @@ -1358,17 +1358,19 @@ static void get_descriptor_table_ptr(struct x86_emulate_ctxt *ctxt, u16 selector, struct desc_ptr *dt) { const struct x86_emulate_ops *ops = ctxt->ops; + u32 base3 = 0; if (selector & 1 << 2) { struct desc_struct desc; u16 sel; memset (dt, 0, sizeof *dt); - if (!ops->get_segment(ctxt, &sel, &desc, NULL, VCPU_SREG_LDTR)) + if (!ops->get_segment(ctxt, &sel, &desc, &base3, + VCPU_SREG_LDTR)) return; dt->size = desc_limit_scaled(&desc); /* what if limit > 65535? */ - dt->address = get_desc_base(&desc); + dt->address = get_desc_base(&desc) | ((u64)base3 << 32); } else ops->get_gdt(ctxt, dt); } -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
