diff options
| author | Gleb Natapov <gleb@redhat.com> | 2010-02-18 12:14:59 +0200 |
|---|---|---|
| committer | Marcelo Tosatti <mtosatti@redhat.com> | 2010-03-01 12:36:13 -0300 |
| commit | 8b9f44140bc4afd2698413cd9960c3912168ee91 (patch) | |
| tree | 5b146e027487435e8cd1ddb2aa27c4dcde640a42 /arch | |
| parent | 70e335e16882df5b5d6971022e63c3603a1e8c23 (diff) | |
KVM: x86 emulator: Forbid modifying CS segment register by mov instruction
Inject #UD if guest attempts to do so. This is in accordance to Intel
SDM.
Cc: stable@kernel.org (2.6.33, 2.6.32)
Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
Diffstat (limited to 'arch')
| -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 c280c2352f7e..2db760ff887c 100644 --- a/arch/x86/kvm/emulate.c +++ b/arch/x86/kvm/emulate.c @@ -2126,6 +2126,12 @@ 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); |