author Jed Davis <>
Mon, 20 Nov 2017 10:47:54 -0700
changeset 447508 3b11a0bf7ae7a7fe0ed508583cf07441b68bab78
parent 284279 91d6e262b662a0b4e47358665e222d3927337af9
child 505383 6f3709b3878117466168c40affa7bca0b60cf75b
permissions -rw-r--r--
Bug 1409895 - Deny getcwd in the Linux content process sandbox. r=gcp getcwd won't do anything useful once we start chroot()ing to remove filesystem access; with this patch it will at least fail the same way regardless of whether user namespaces are available or if other factors prevent complete FS isolation. Bonus fix: improve the comments for this group of syscalls. MozReview-Commit-ID: KueZzly2mlO

/* -*- 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 */

/* Implements a mozilla::IsNullPointer<T> type trait. */

#ifndef mozilla_NullPtr_h
#define mozilla_NullPtr_h

#include "mozilla/TypeTraits.h"

namespace mozilla {

 * IsNullPointer<T>::value is true iff T is decltype(nullptr).
 * Ideally this would be in TypeTraits.h, but C++11 omitted std::is_null_pointer
 * (fixed in C++14), so in the interests of easing a switch to <type_traits>,
 * this trait lives elsewhere.
template<typename T>
struct IsNullPointer : FalseType {};

struct IsNullPointer<decltype(nullptr)> : TrueType {};

} // namespace mozilla

#endif /* mozilla_NullPtr_h */