SandboxReporterCommon.h

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

/* vim: set ts=8 sts=2 et sw=2 tw=80: */

/* This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this file,

 * You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef mozilla_SandboxReporterCommon_h

#define mozilla_SandboxReporterCommon_h

#include "mozilla/IntegerTypeTraits.h"

#include "mozilla/Types.h"

#include <sys/types.h>

// Note: this is also used in libmozsandbox, so dependencies on

// symbols from libxul probably won't work.

namespace mozilla {

static const size_t kSandboxSyscallArguments = 6;

// fds 0-2: stdio; fd 3: IPC; fd 4: crash reporter.  (The IPC child

// process launching code will check that we don't try to use the same

// fd twice.)

static const int kSandboxReporterFileDesc = 5;

// This struct represents a system call that was rejected by a

// seccomp-bpf policy.

struct SandboxReport {

  // In the future this may include finer distinctions than

  // GeckoProcessType -- e.g., whether a content process can load

  // file:/// URLs, or if it's reserved for content with certain

  // user-granted permissions.

  enum class ProcType : uint8_t {

    CONTENT,

    FILE,

    MEDIA_PLUGIN,

    RDD,

    SOCKET_PROCESS,

    UTILITY,

};

  // The syscall number and arguments are usually `unsigned long`, but

  // that causes ambiguous overload errors with nsACString::AppendInt.

  using ULong = UnsignedStdintTypeForSize<sizeof(unsigned long)>::Type;

  // This time uses CLOCK_MONOTONIC_COARSE.  Displaying or reporting

  // it should usually be done relative to the current value of that

  // clock (or the time at some other event of interest, like a

  // subsequent crash).

  struct timespec mTime;

  // The pid/tid values, like every other field in this struct, aren't

  // authenticated and a compromised process could send anything, so

  // use the values with caution.

  pid_t mPid;

  pid_t mTid;

  ProcType mProcType;

  ULong mSyscall;

  ULong mArgs[kSandboxSyscallArguments];

  SandboxReport() : mPid(0) {}

  bool IsValid() const { return mPid > 0; }

};

}  // namespace mozilla

#endif  // mozilla_SandboxReporterCommon_h