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KVM: x86: Inject #GP when loading system segments with non-canonical base

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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 <[email protected]>
Signed-off-by: Paolo Bonzini <[email protected]>
This commit is contained in:
Nadav Amit 2014-11-02 11:54:56 +02:00 • committed by Paolo Bonzini
commit 9a9abf6b61
1 changed files with 6 additions and 0 deletions
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6
arch/x86/kvm/emulate.c
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@ -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