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.
5 #ifndef SANDBOX_LINUX_SECCOMP_BPF_VERIFIER_H__
6 #define SANDBOX_LINUX_SECCOMP_BPF_VERIFIER_H__
8 #include <linux/filter.h>
14 namespace playground2 {
18 // Evaluate the BPF program for all possible inputs and verify that it
19 // computes the correct result. We use the "evaluators" to determine
20 // the full set of possible inputs that we have to iterate over.
21 // Returns success, if the BPF filter accurately reflects the rules
22 // set by the "evaluators".
23 // Upon success, "err" is set to NULL. Upon failure, it contains a static
24 // error message that does not need to be free()'d.
25 static bool VerifyBPF(Sandbox *sandbox,
26 const std::vector<struct sock_filter>& program,
27 const Sandbox::Evaluators& evaluators,
30 // Evaluate a given BPF program for a particular set of system call
31 // parameters. If evaluation failed for any reason, "err" will be set to
32 // a non-NULL error string. Otherwise, the BPF program's result will be
33 // returned by the function and "err" is NULL.
34 // We do not actually implement the full BPF state machine, but only the
35 // parts that can actually be generated by our BPF compiler. If this code
36 // is used for purposes other than verifying the output of the sandbox's
37 // BPF compiler, we might have to extend this BPF interpreter.
38 static uint32_t EvaluateBPF(const std::vector<struct sock_filter>& program,
39 const struct arch_seccomp_data& data,
43 DISALLOW_IMPLICIT_CONSTRUCTORS(Verifier);
48 #endif // SANDBOX_LINUX_SECCOMP_BPF_VERIFIER_H__