tree 5c374dad5036d05134f833c10073bc89a0f85657
parent fd56e1546a5f734290cbedd2b81c518850736511
author Nadav Amit <namit@cs.technion.ac.il> 1414447423 +0200
committer Paolo Bonzini <pbonzini@redhat.com> 1414584831 +0100

KVM: x86: Fix far-jump to non-canonical check

Commit d1442d85cc30 ("KVM: x86: Handle errors when RIP is set during far
jumps") introduced a bug that caused the fix to be incomplete.  Due to
incorrect evaluation, far jump to segment with L bit cleared (i.e., 32-bit
segment) and RIP with any of the high bits set (i.e, RIP[63:32] != 0) set may
not trigger #GP.  As we know, this imposes a security problem.

In addition, the condition for two warnings was incorrect.

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Nadav Amit <namit@cs.technion.ac.il>
[Add #ifdef CONFIG_X86_64 to avoid complaints of undefined behavior. - Paolo]
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>