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46 lines
1.5 KiB
C
46 lines
1.5 KiB
C
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/* Enter a mount namespace.
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Copyright (C) 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 <sys/mount.h>
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bool
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support_enter_mount_namespace (void)
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{
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#ifdef CLONE_NEWNS
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if (unshare (CLONE_NEWNS) == 0)
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{
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/* On some systems, / is marked as MS_SHARED, which means that
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mounts within the namespace leak to the rest of the system,
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which is not what we want. */
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if (mount ("none", "/", NULL, MS_REC | MS_PRIVATE, NULL) != 0)
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{
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printf ("warning: making the mount namespace private failed: %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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else
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printf ("warning: unshare (CLONE_NEWNS) failed: %m\n");
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#endif /* CLONE_NEWNS */
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return false;
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}
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