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23 lines
761 B
Plaintext
23 lines
761 B
Plaintext
$NetBSD: patch-CVE-2015-2151,v 1.1 2015/03/10 20:27:16 spz Exp $
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xsa123-4.3-4.2.patch from upstream:
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x86emul: fully ignore segment override for register-only operations
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For ModRM encoded instructions with register operands we must not
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overwrite ea.mem.seg (if a - bogus in that case - segment override was
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present) as it aliases with ea.reg.
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This is CVE-2015-2151 / XSA-123.
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--- xen/arch/x86/x86_emulate/x86_emulate.c.orig 2015-03-10 20:10:23.000000000 +0000
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+++ xen/arch/x86/x86_emulate/x86_emulate.c
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@@ -1462,7 +1462,7 @@ x86_emulate(
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}
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}
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- if ( override_seg != -1 )
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+ if ( override_seg != -1 && ea.type == OP_MEM )
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ea.mem.seg = override_seg;
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/* Decode and fetch the source operand: register, memory or immediate. */
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