Update from chromium 62675d9fb31fb8cedc40f68e78e8445a74f362e7

sandbox/linux/seccomp-bpf/verifier.h

+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef SANDBOX_LINUX_SECCOMP_BPF_VERIFIER_H__
+#define SANDBOX_LINUX_SECCOMP_BPF_VERIFIER_H__
+
+#include <stdint.h>
+
+#include <vector>
+
+#include "base/macros.h"
+
+struct sock_filter;
+
+namespace sandbox {
+struct arch_seccomp_data;
+namespace bpf_dsl {
+class SandboxBPFDSLPolicy;
+class PolicyCompiler;
+}
+
+class Verifier {
+ public:
+  // Evaluate the BPF program for all possible inputs and verify that it
+  // computes the correct result. We use the "evaluators" to determine
+  // the full set of possible inputs that we have to iterate over.
+  // Returns success, if the BPF filter accurately reflects the rules
+  // set by the "evaluators".
+  // Upon success, "err" is set to NULL. Upon failure, it contains a static
+  // error message that does not need to be free()'d.
+  static bool VerifyBPF(bpf_dsl::PolicyCompiler* compiler,
+                        const std::vector<struct sock_filter>& program,
+                        const bpf_dsl::SandboxBPFDSLPolicy& policy,
+                        const char** err);
+
+  // Evaluate a given BPF program for a particular set of system call
+  // parameters. If evaluation failed for any reason, "err" will be set to
+  // a non-NULL error string. Otherwise, the BPF program's result will be
+  // returned by the function and "err" is NULL.
+  // We do not actually implement the full BPF state machine, but only the
+  // parts that can actually be generated by our BPF compiler. If this code
+  // is used for purposes other than verifying the output of the sandbox's
+  // BPF compiler, we might have to extend this BPF interpreter.
+  static uint32_t EvaluateBPF(const std::vector<struct sock_filter>& program,
+                              const struct arch_seccomp_data& data,
+                              const char** err);
+
+ private:
+  DISALLOW_IMPLICIT_CONSTRUCTORS(Verifier);
+};
+
+}  // namespace sandbox
+
+#endif  // SANDBOX_LINUX_SECCOMP_BPF_VERIFIER_H__