content/common/sandbox_linux/sandbox_bpf_base_policy_linux.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 CONTENT_COMMON_SANDBOX_LINUX_SANDBOX_BPF_BASE_POLICY_LINUX_H_
   6 #define CONTENT_COMMON_SANDBOX_LINUX_SANDBOX_BPF_BASE_POLICY_LINUX_H_
   7
   8 #include "base/basictypes.h"
   9 #include "base/memory/scoped_ptr.h"
  10 #include "sandbox/linux/bpf_dsl/bpf_dsl.h"
  11 #include "sandbox/linux/seccomp-bpf-helpers/baseline_policy.h"
  12
  13 namespace content {
  14
  15 // The "baseline" BPF policy for content/. Any content/ seccomp-bpf policy
  16 // should inherit from it.
  17 // It implements the main SandboxBPFDSLPolicy interface. Due to its nature
  18 // as a "kernel attack surface reduction" layer, it's implementation-defined.
  19 class SandboxBPFBasePolicy : public sandbox::bpf_dsl::SandboxBPFDSLPolicy {
  20  public:
  21   SandboxBPFBasePolicy();
  22   virtual ~SandboxBPFBasePolicy();
  23
  24   virtual sandbox::bpf_dsl::ResultExpr EvaluateSyscall(
  25       int system_call_number) const OVERRIDE;
  26   virtual sandbox::bpf_dsl::ResultExpr InvalidSyscall() const OVERRIDE;
  27
  28   // A policy can implement this hook to run code right before the policy
  29   // is passed to the BPF compiler and the sandbox is engaged.
  30   // If PreSandboxHook() returns true, the sandbox is guaranteed to be
  31   // engaged afterwards.
  32   // This will be used when enabling the sandbox though
  33   // SandboxSeccompBPF::StartSandbox().
  34   virtual bool PreSandboxHook();
  35
  36   // Get the errno(3) to return for filesystem errors.
  37   static int GetFSDeniedErrno();
  38
  39  private:
  40   // Compose the BaselinePolicy from sandbox/.
  41   scoped_ptr<sandbox::BaselinePolicy> baseline_policy_;
  42   DISALLOW_COPY_AND_ASSIGN(SandboxBPFBasePolicy);
  43 };
  44
  45 }  // namespace content
  46
  47 #endif  // CONTENT_COMMON_SANDBOX_LINUX_SANDBOX_BPF_BASE_POLICY_LINUX_H_