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 15 struct sock_filter; 16 17 namespace sandbox { 18 struct arch_seccomp_data; 19 20 namespace bpf_dsl { 21 22 // TODO(mdempsky): This class doesn't perform any verification any more, so it 23 // deserves a new name. 24 class 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