chrome/browser/android/seccomp_support_detector.h

   1 // Copyright 2015 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 CHROME_BROWSER_ANDROID_SECCOMP_SUPPORT_DETECTOR_H_
   6 #define CHROME_BROWSER_ANDROID_SECCOMP_SUPPORT_DETECTOR_H_
   7
   8 #include "base/compiler_specific.h"
   9 #include "content/public/browser/utility_process_host_client.h"
  10
  11 // This class is used to report via UMA the Android kernel version and
  12 // level of seccomp-bpf support. The kernel version is read from the blocking
  13 // thread pool, while seccomp support is tested in a utility process, in case
  14 // the probing causes a crash.
  15 class SeccompSupportDetector : public content::UtilityProcessHostClient {
  16  public:
  17   // Starts the detection process. This should be called once per browser
  18   // session. This is safe to call from any thread.
  19   static void StartDetection();
  20
  21  private:
  22   SeccompSupportDetector();
  23   ~SeccompSupportDetector() override;
  24
  25   // Called on the blocking thread pool. This reads the utsname and records
  26   // the kernel version.
  27   void DetectKernelVersion();
  28
  29   // Called on the IO thread. This starts a utility process to detect seccomp.
  30   void DetectSeccomp();
  31
  32   // UtilityProcessHostClient:
  33   void OnProcessCrashed(int exit_code) override;
  34   bool OnMessageReceived(const IPC::Message& message) override;
  35
  36   // OnDetectPrctl is always received before OnDetectSyscall.
  37   void OnDetectPrctl(bool prctl_supported);
  38   void OnDetectSyscall(bool syscall_supported);
  39
  40   // Whether OnDetectPrctl was received.
  41   bool prctl_detected_;
  42
  43   DISALLOW_COPY_AND_ASSIGN(SeccompSupportDetector);
  44 };
  45
  46 #endif  // CHROME_BROWSER_ANDROID_SECCOMP_SUPPORT_DETECTOR_H_