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/* Acquire root privileges.
Copyright (C) 2016 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#include <support/namespace.h>
#include <sched.h>
#include <stdio.h>
#include <unistd.h>
bool
support_become_root (void)
{
#ifdef CLONE_NEWUSER
if (unshare (CLONE_NEWUSER | CLONE_NEWNS) == 0)
/* Even if we do not have UID zero, we have extended privileges at
this point. */
return true;
#endif
if (setuid (0) != 0)
{
printf ("warning: could not become root outside namespace (%m)\n");
return false;
}
return true;
}
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