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Potential Vulnerability in Cloned Code #95

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9 changes: 6 additions & 3 deletions arch/x86/kvm/emulate.c
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Original file line number Diff line number Diff line change
Expand Up @@ -2423,8 +2423,11 @@ static int em_sysexit(struct x86_emulate_ctxt *ctxt)
cs.d = 0;
cs.l = 1;
if (is_noncanonical_address(rcx) ||
if (is_noncanonical_address(rcx) ||
is_noncanonical_address(rdx))
is_noncanonical_address(rdx))
return emulate_gp(ctxt, 0);
return emulate_gp(ctxt, 0);
break;
}
cs_sel |= SELECTOR_RPL_MASK;
Expand Down Expand Up @@ -4872,8 +4875,8 @@ int x86_emulate_insn(struct x86_emulate_ctxt *ctxt)
ctxt->dst.val = (s32) ctxt->src.val;
break;
case 0x70 ... 0x7f: /* jcc (short) */
if (test_cc(ctxt->b, ctxt->eflags))
rc = jmp_rel(ctxt, ctxt->src.val);
if (test_cc(ctxt->b, ctxt->eflags))
break;
case 0x8d: /* lea r16/r32, m */
ctxt->dst.val = ctxt->src.addr.mem.ea;
Expand Down Expand Up @@ -4902,8 +4905,8 @@ int x86_emulate_insn(struct x86_emulate_ctxt *ctxt)
rc = emulate_int(ctxt, 4);
break;
case 0xe9: /* jmp rel */
case 0xeb: /* jmp rel short */
rc = jmp_rel(ctxt, ctxt->src.val);
case 0xeb: /* jmp rel short */
ctxt->dst.type = OP_NONE; /* Disable writeback. */
break;
case 0xf4: /* hlt */
Expand Down Expand Up @@ -5027,8 +5030,8 @@ int x86_emulate_insn(struct x86_emulate_ctxt *ctxt)
ctxt->dst.type = OP_NONE; /* no writeback */
break;
case 0x80 ... 0x8f: /* jnz rel, etc*/
if (test_cc(ctxt->b, ctxt->eflags))
rc = jmp_rel(ctxt, ctxt->src.val);
if (test_cc(ctxt->b, ctxt->eflags))
break;
case 0x90 ... 0x9f: /* setcc r/m8 */
ctxt->dst.val = test_cc(ctxt->b, ctxt->eflags);
Expand Down