Nuke the sandbox

1 files changed, 0 insertions, 106 deletions

diff --git a/security/sandbox/linux/SandboxUtil.cpp b/security/sandbox/linux/SandboxUtil.cpp
deleted file mode 100644
index 999329882..000000000
--- a/security/sandbox/linux/SandboxUtil.cpp
+++ /dev/null
@@ -1,106 +0,0 @@
-/* -*- 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/. */
-
-#include "SandboxUtil.h"
-
-#include "LinuxCapabilities.h"
-#include "LinuxSched.h"
-#include "SandboxLogging.h"
-
-#include <fcntl.h>
-#include <sys/stat.h>
-#include <sys/syscall.h>
-#include <sys/types.h>
-#include <unistd.h>
-
-#include "mozilla/Assertions.h"
-#include "mozilla/Sprintf.h"
-#include "mozilla/Unused.h"
-#include "sandbox/linux/system_headers/linux_syscalls.h"
-
-namespace mozilla {
-
-bool
-IsSingleThreaded()
-{
-  // This detects the thread count indirectly.  /proc/<pid>/task has a
-  // subdirectory for each thread in <pid>'s thread group, and the
-  // link count on the "task" directory follows Unix expectations: the
-  // link from its parent, the "." link from itself, and the ".." link
-  // from each subdirectory; thus, 2+N links for N threads.
-  struct stat sb;
-  if (stat("/proc/self/task", &sb) < 0) {
-    MOZ_DIAGNOSTIC_ASSERT(false, "Couldn't access /proc/self/task!");
-    return false;
-  }
-  MOZ_DIAGNOSTIC_ASSERT(sb.st_nlink >= 3);
-  return sb.st_nlink == 3;
-}
-
-static bool
-WriteStringToFile(const char* aPath, const char* aStr, const size_t aLen)
-{
-  int fd = open(aPath, O_WRONLY);
-  if (fd < 0) {
-    return false;
-  }
-  ssize_t written = write(fd, aStr, aLen);
-  if (close(fd) != 0 || written != ssize_t(aLen)) {
-    return false;
-  }
-  return true;
-}
-
-bool
-UnshareUserNamespace()
-{
-  // The uid and gid need to be retrieved before the unshare; see
-  // below.
-  uid_t uid = getuid();
-  gid_t gid = getgid();
-  char buf[80];
-
-  if (syscall(__NR_unshare, CLONE_NEWUSER) != 0) {
-    return false;
-  }
-
-  // As mentioned in the header, this function sets up uid/gid
-  // mappings that preserve the process's previous ids.  Mapping the
-  // uid/gid to something is necessary in order to nest user
-  // namespaces (not used yet, but we'll need this in the future for
-  // pid namespace support), and leaving the ids unchanged is the
-  // least confusing option.
-  //
-  // In recent kernels (3.19, 3.18.2, 3.17.8), for security reasons,
-  // establishing gid mappings will fail unless the process first
-  // revokes its ability to call setgroups() by using a /proc node
-  // added in the same set of patches.
-  //
-  // Note that /proc/self points to the thread group leader, not the
-  // current thread.  However, CLONE_NEWUSER can be unshared only in a
-  // single-threaded process, so those are equivalent if we reach this
-  // point.
-  int len = SprintfLiteral(buf, "%u %u 1\n", uid, uid);
-  if (len >= int(sizeof(buf)) || len < 0) {
-    return false;
-  }
-  if (!WriteStringToFile("/proc/self/uid_map", buf, size_t(len))) {
-    MOZ_CRASH("Failed to write /proc/self/uid_map");
-  }
-
-  Unused << WriteStringToFile("/proc/self/setgroups", "deny", 4);
-
-  len = SprintfLiteral(buf, "%u %u 1\n", gid, gid);
-  if (len >= int(sizeof(buf)) || len < 0) {
-    return false;
-  }
-  if (!WriteStringToFile("/proc/self/gid_map", buf, size_t(len))) {
-    MOZ_CRASH("Failed to write /proc/self/gid_map");
-  }
-  return true;
-}
-
-} // namespace mozilla