Changeset 87603 in vbox for trunk/src/VBox/VMM/VMMR0

Timestamp:

Feb 4, 2021 9:53:08 AM (4 years ago)

Author:

vboxsync

svn:sync-xref-src-repo-rev:

142637

Message:

VMM/HMVMX: Play safe with msrSFMASK.

File:

• trunk/src/VBox/VMM/VMMR0/HMVMXR0.cpp (modified) (1 diff)

trunk/src/VBox/VMM/VMMR0/HMVMXR0.cpp

@@ -2584 +2584 @@
             ASMWrMsr(MSR_K8_LSTAR,          pCtx->msrLSTAR);
             ASMWrMsr(MSR_K6_STAR,           pCtx->msrSTAR);
-            ASMWrMsr(MSR_K8_SF_MASK,        pCtx->msrSFMASK);
+            /* The system call flag mask register isn't as benign and accepting of all
+               values as the above, so mask it to avoid #GP'ing on corrupted input. */
+            Assert(!(pCtx->msrSFMASK & ~(uint64_t)UINT32_MAX));
+            ASMWrMsr(MSR_K8_SF_MASK,        pCtx->msrSFMASK & UINT32_MAX);
         }
     }