1/* Acquire root privileges.
2 Copyright (C) 2016-2017 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <http://www.gnu.org/licenses/>. */
18
19#include <support/namespace.h>
20
21#include <sched.h>
22#include <stdio.h>
23#include <unistd.h>
24
25bool
26support_become_root (void)
27{
28#ifdef CLONE_NEWUSER
29 if (unshare (CLONE_NEWUSER | CLONE_NEWNS) == 0)
30 /* Even if we do not have UID zero, we have extended privileges at
31 this point. */
32 return true;
33#endif
34 if (setuid (0) != 0)
35 {
36 printf ("warning: could not become root outside namespace (%m)\n");
37 return false;
38 }
39 return true;
40}
41