diff options
| author | Gleb Natapov <gleb@redhat.com> | 2010-02-18 12:14:59 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-03-15 08:50:15 -0700 |
| commit | 3e338f53281fc492a931928e6e53ec15eaf9cf3d (patch) | |
| tree | dbf5bf84421f7b1e4338017879ce82fb7671452b /arch/x86/kvm | |
| parent | 89412b0b75eab56d30a2592bb8fd3d8f68825803 (diff) | |
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>
Diffstat (limited to 'arch/x86/kvm')
| -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 5ca9556f221e..e9604420b778 100644 --- a/arch/x86/kvm/emulate.c +++ b/arch/x86/kvm/emulate.c @@ -1875,6 +1875,12 @@ 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); |