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SUSE:SLE-12-SP1:GA
xen.481
xsa123.patch
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File xsa123.patch of Package xen.481
References: bsc#919464 CVE-2015-2151 XSA-123 x86emul: fully ignore segment override for register-only operations For ModRM encoded instructions with register operands we must not overwrite ea.mem.seg (if a - bogus in that case - segment override was present) as it aliases with ea.reg. This is CVE-2015-2151 / XSA-123. Signed-off-by: Jan Beulich <jbeulich@suse.com> Reviewed-by: Tim Deegan <tim@xen.org> --- a/xen/arch/x86/x86_emulate/x86_emulate.c +++ b/xen/arch/x86/x86_emulate/x86_emulate.c @@ -1641,7 +1641,7 @@ x86_emulate( } } - if ( override_seg != -1 ) + if ( override_seg != -1 && ea.type == OP_MEM ) ea.mem.seg = override_seg; /* Early operand adjustments. */
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