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| author | Gleb Natapov <gleb@redhat.com> | 2010-02-18 12:14:59 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-03-15 09:07:11 -0700 |
| commit | 8bc4cf28e87f4269773061bac06087c5efe1cc8b (patch) | |
| tree | 88090ac4ef10820109e128ffeff9714a8b37020f | |
| parent | 1c731613a9923eed0405f1abbc689e0a16add65a (diff) | |
| download | lwn-8bc4cf28e87f4269773061bac06087c5efe1cc8b.tar.gz lwn-8bc4cf28e87f4269773061bac06087c5efe1cc8b.zip | |
KVM: x86 emulator: Forbid modifying CS segment register by mov instruction
commit 8b9f44140bc4afd2698413cd9960c3912168ee91 upstream.
Inject #UD if guest attempts to do so. This is in accordance to Intel
SDM.
Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| -rw-r--r-- | arch/x86/kvm/emulate.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c index f4e2a49513f1..3b9aca42cd30 100644 --- a/arch/x86/kvm/emulate.c +++ b/arch/x86/kvm/emulate.c @@ -1987,6 +1987,12 @@ special_insn: int err; sel = c->src.val; + + if (c->modrm_reg == VCPU_SREG_CS) { + kvm_queue_exception(ctxt->vcpu, UD_VECTOR); + goto done; + } + if (c->modrm_reg == VCPU_SREG_SS) toggle_interruptibility(ctxt, X86_SHADOW_INT_MOV_SS); |