KVM: emulator: more strict rsm checks.

Don't ignore return values in rsm_load_state_64/32 to avoid
loading invalid state from SMM state area if it was tampered with
by the guest.

This is primarly intended to avoid letting guest set bits in EFER
(like EFER.SVME when nesting is disabled) by manipulating SMM save area.

Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com>
Message-Id: <20200827171145.374620-8-mlevitsk@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index d0e2825..1d450d7 100644 (file)
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -2505,9 +2505,14 @@ static int rsm_load_state_32(struct x86_emulate_ctxt *ctxt,
                *reg_write(ctxt, i) = GET_SMSTATE(u32, smstate, 0x7fd0 + i * 4);
 
        val = GET_SMSTATE(u32, smstate, 0x7fcc);
-       ctxt->ops->set_dr(ctxt, 6, (val & DR6_VOLATILE) | DR6_FIXED_1);
+
+       if (ctxt->ops->set_dr(ctxt, 6, (val & DR6_VOLATILE) | DR6_FIXED_1))
+               return X86EMUL_UNHANDLEABLE;
+
        val = GET_SMSTATE(u32, smstate, 0x7fc8);
-       ctxt->ops->set_dr(ctxt, 7, (val & DR7_VOLATILE) | DR7_FIXED_1);
+
+       if (ctxt->ops->set_dr(ctxt, 7, (val & DR7_VOLATILE) | DR7_FIXED_1))
+               return X86EMUL_UNHANDLEABLE;
 
        selector =                 GET_SMSTATE(u32, smstate, 0x7fc4);
        set_desc_base(&desc,       GET_SMSTATE(u32, smstate, 0x7f64));
@@ -2560,16 +2565,23 @@ static int rsm_load_state_64(struct x86_emulate_ctxt *ctxt,
        ctxt->eflags = GET_SMSTATE(u32, smstate, 0x7f70) | X86_EFLAGS_FIXED;
 
        val = GET_SMSTATE(u32, smstate, 0x7f68);
-       ctxt->ops->set_dr(ctxt, 6, (val & DR6_VOLATILE) | DR6_FIXED_1);
+
+       if (ctxt->ops->set_dr(ctxt, 6, (val & DR6_VOLATILE) | DR6_FIXED_1))
+               return X86EMUL_UNHANDLEABLE;
+
        val = GET_SMSTATE(u32, smstate, 0x7f60);
-       ctxt->ops->set_dr(ctxt, 7, (val & DR7_VOLATILE) | DR7_FIXED_1);
+
+       if (ctxt->ops->set_dr(ctxt, 7, (val & DR7_VOLATILE) | DR7_FIXED_1))
+               return X86EMUL_UNHANDLEABLE;
 
        cr0 =                       GET_SMSTATE(u64, smstate, 0x7f58);
        cr3 =                       GET_SMSTATE(u64, smstate, 0x7f50);
        cr4 =                       GET_SMSTATE(u64, smstate, 0x7f48);
        ctxt->ops->set_smbase(ctxt, GET_SMSTATE(u32, smstate, 0x7f00));
        val =                       GET_SMSTATE(u64, smstate, 0x7ed0);
-       ctxt->ops->set_msr(ctxt, MSR_EFER, val & ~EFER_LMA);
+
+       if (ctxt->ops->set_msr(ctxt, MSR_EFER, val & ~EFER_LMA))
+               return X86EMUL_UNHANDLEABLE;
 
        selector =                  GET_SMSTATE(u32, smstate, 0x7e90);
        rsm_set_desc_flags(&desc,   GET_SMSTATE(u32, smstate, 0x7e92) << 8);