sandbox/linux/seccomp-bpf/sandbox_bpf_policy.h

   1 // Copyright 2013 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_SECCOMP_BPF_SANDBOX_BPF_POLICY_H_
   6 #define SANDBOX_LINUX_SECCOMP_BPF_SANDBOX_BPF_POLICY_H_
   7
   8 #include "base/basictypes.h"
   9 #include "sandbox/sandbox_export.h"
  10
  11 namespace sandbox {
  12
  13 class ErrorCode;
  14 class SandboxBPF;
  15
  16 // This is the interface to implement to define a BPF sandbox policy.
  17 class SANDBOX_EXPORT SandboxBPFPolicy {
  18  public:
  19   SandboxBPFPolicy() {}
  20   virtual ~SandboxBPFPolicy() {}
  21
  22   // The EvaluateSyscall method is called with the system call number. It can
  23   // decide to allow the system call unconditionally by returning ERR_ALLOWED;
  24   // it can deny the system call unconditionally by returning an appropriate
  25   // "errno" value; or it can request inspection of system call argument(s) by
  26   // returning a suitable ErrorCode.
  27   // Will only be called for valid system call numbers.
  28   virtual ErrorCode EvaluateSyscall(SandboxBPF* sandbox_compiler,
  29                                     int system_call_number) const = 0;
  30
  31   // The InvalidSyscall method specifies the behavior used for invalid
  32   // system calls.  The default implementation is to return ENOSYS.
  33   virtual ErrorCode InvalidSyscall(SandboxBPF* sandbox_compiler) const;
  34
  35  private:
  36   DISALLOW_COPY_AND_ASSIGN(SandboxBPFPolicy);
  37 };
  38
  39 }  // namespace sandbox
  40
  41 #endif  // SANDBOX_LINUX_SECCOMP_BPF_SANDBOX_BPF_POLICY_H_