| /* Enter a mount namespace. |
| Copyright (C) 2017-2018 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> |
| #ifdef CLONE_NEWNS |
| # include <sys/mount.h> |
| #endif /* CLONE_NEWNS */ |
| |
| bool |
| support_enter_mount_namespace (void) |
| { |
| #ifdef CLONE_NEWNS |
| if (unshare (CLONE_NEWNS) == 0) |
| { |
| /* On some systems, / is marked as MS_SHARED, which means that |
| mounts within the namespace leak to the rest of the system, |
| which is not what we want. */ |
| if (mount ("none", "/", NULL, MS_REC | MS_PRIVATE, NULL) != 0) |
| { |
| printf ("warning: making the mount namespace private failed: %m\n"); |
| return false; |
| } |
| return true; |
| } |
| else |
| printf ("warning: unshare (CLONE_NEWNS) failed: %m\n"); |
| #endif /* CLONE_NEWNS */ |
| return false; |
| } |
