1// Copyright (c) 2012 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#ifndef SANDBOX_LINUX_BPF_DSL_VERIFIER_H__
6#define SANDBOX_LINUX_BPF_DSL_VERIFIER_H__
7
8#include <stdint.h>
9
10#include <vector>
11
12#include "base/macros.h"
13#include "sandbox/sandbox_export.h"
14
15struct sock_filter;
16
17namespace sandbox {
18struct arch_seccomp_data;
19
20namespace bpf_dsl {
21
22// TODO(mdempsky): This class doesn't perform any verification any more, so it
23// deserves a new name.
24class SANDBOX_EXPORT Verifier {
25 public:
26  // Evaluate a given BPF program for a particular set of system call
27  // parameters. If evaluation failed for any reason, "err" will be set to
28  // a non-NULL error string. Otherwise, the BPF program's result will be
29  // returned by the function and "err" is NULL.
30  // We do not actually implement the full BPF state machine, but only the
31  // parts that can actually be generated by our BPF compiler. If this code
32  // is used for purposes other than verifying the output of the sandbox's
33  // BPF compiler, we might have to extend this BPF interpreter.
34  static uint32_t EvaluateBPF(const std::vector<struct sock_filter>& program,
35                              const struct arch_seccomp_data& data,
36                              const char** err);
37
38 private:
39  DISALLOW_IMPLICIT_CONSTRUCTORS(Verifier);
40};
41
42}  // namespace bpf_dsl
43}  // namespace sandbox
44
45#endif  // SANDBOX_LINUX_BPF_DSL_VERIFIER_H__
46