On 05/08/2011 11:18 AM, Nadav Har'El wrote:
This patch includes a utility function for decoding pointer operands of VMX
instructions issued by L1 (a guest hypervisor)
+ /*
+ * TODO: throw #GP (and return 1) in various cases that the VM*
+ * instructions require it - e.g., offset beyond segment limit,
+ * unusable or unreadable/unwritable segment, non-canonical 64-bit
+ * address, and so on. Currently these are not checked.
+ */
+ return 0;
+}
+
Note: emulate.c now contains a function (linearize()) which does these
calculations. We need to generalize it and expose it so nvmx can make
use of it.
There is no real security concern since these instructions are only
allowed from cpl 0 anyway.
--
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.
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