Bug the VM and terminate emulation if an out-of-bounds read into the
emulator's data cache occurs. Knowingly contuining on all but guarantees
that KVM will overwrite random kernel data, which is far, far worse than
killing the VM.
Signed-off-by: Sean Christopherson <seanjc@google.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Message-Id: <
20220526210817.3428868-9-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
if (mc->pos < mc->end)
goto read_cached;
- WARN_ON((mc->end + size) >= sizeof(mc->data));
+ if (KVM_EMULATOR_BUG_ON((mc->end + size) >= sizeof(mc->data), ctxt))
+ return X86EMUL_UNHANDLEABLE;
rc = ctxt->ops->read_emulated(ctxt, addr, mc->data + mc->end, size,
&ctxt->exception);