41 lines
1.2 KiB
C
41 lines
1.2 KiB
C
/* Acquire root privileges.
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Copyright (C) 2016-2017 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <support/namespace.h>
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#include <sched.h>
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#include <stdio.h>
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#include <unistd.h>
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bool
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support_become_root (void)
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{
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#ifdef CLONE_NEWUSER
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if (unshare (CLONE_NEWUSER | CLONE_NEWNS) == 0)
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/* Even if we do not have UID zero, we have extended privileges at
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this point. */
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return true;
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#endif
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if (setuid (0) != 0)
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{
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printf ("warning: could not become root outside namespace (%m)\n");
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return false;
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}
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return true;
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}
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