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| author |   Nadav Amit <namit@cs.technion.ac.il> | 2014-11-02 11:54:56 +0200 |
|---|---|---|
| committer |   Paolo Bonzini <pbonzini@redhat.com> | 2014-11-07 15:44:09 +0100 |
| commit | 9a9abf6b612709f67b9e3852554191541631d075 (patch) | |
| tree | 9a8e521a247cbd4c34e157298e9bc2c85b30957c /arch/x86/kvm/emulate.c | |
| parent | KVM: x86: Combine the lgdt and lidt emulation logic (diff) | |
| download | linux-dev-9a9abf6b612709f67b9e3852554191541631d075.tar.xz linux-dev-9a9abf6b612709f67b9e3852554191541631d075.zip | |
KVM: x86: Inject #GP when loading system segments with non-canonical base
When emulating LTR/LDTR/LGDT/LIDT, #GP should be injected if the base is
non-canonical. Otherwise, VM-entry will fail.
Signed-off-by: Nadav Amit <namit@cs.technion.ac.il>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to '')
| -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 c86b3781fca2..fab270801809 100644 --- a/arch/x86/kvm/emulate.c +++ b/arch/x86/kvm/emulate.c @@ -1620,6 +1620,9 @@ static int __load_segment_descriptor(struct x86_emulate_ctxt *ctxt, sizeof(base3), &ctxt->exception); if (ret != X86EMUL_CONTINUE) return ret; + if (is_noncanonical_address(get_desc_base(&seg_desc) | + ((u64)base3 << 32))) + return emulate_gp(ctxt, 0); } load: ctxt->ops->set_segment(ctxt, selector, &seg_desc, base3, seg); @@ -3339,6 +3342,9 @@ static int em_lgdt_lidt(struct x86_emulate_ctxt *ctxt, bool lgdt) ctxt->op_bytes); if (rc != X86EMUL_CONTINUE) return rc; + if (ctxt->mode == X86EMUL_MODE_PROT64 && + is_noncanonical_address(desc_ptr.address)) + return emulate_gp(ctxt, 0); if (lgdt) ctxt->ops->set_gdt(ctxt, &desc_ptr); else |