Changeset 100824 in vbox

Timestamp:

Aug 9, 2023 12:21:27 AM (16 months ago)

Author:

vboxsync

Message:

VMM/IEM: Corrected wrong calculation in BODY_CHECK_CS_LIM. Untested. bugref:10369

File:

• trunk/src/VBox/VMM/VMMAll/IEMAllThrdFuncsBltIn.cpp (modified) (1 diff)

trunk/src/VBox/VMM/VMMAll/IEMAllThrdFuncsBltIn.cpp

@@ -163 +163 @@
  * number of functions.
  */
+/** @todo consider 32-bit EIP mid-instruction wrap-around... Difficult to
+ *        test, since it would require replacing the default firmware. */
 #define BODY_CHECK_CS_LIM(a_cbInstr) do { \
-        if (RT_LIKELY(pVCpu->cpum.GstCtx.eip - pVCpu->cpum.GstCtx.cs.u32Limit >= cbInstr)) \
+        if (RT_LIKELY((uint32_t)(pVCpu->cpum.GstCtx.eip + cbInstr) <= pVCpu->cpum.GstCtx.cs.u32Limit)) \
         { /* likely */ } \
         else \