2010-08-14 19:59:25 +02:00
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/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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2010-03-31 16:29:55 +02:00
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/***
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This file is part of systemd.
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Copyright 2010 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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2012-04-12 00:20:58 +02:00
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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2010-03-31 16:29:55 +02:00
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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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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2012-04-12 00:20:58 +02:00
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Lesser General Public License for more details.
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2010-03-31 16:29:55 +02:00
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2012-04-12 00:20:58 +02:00
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You should have received a copy of the GNU Lesser General Public License
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2010-03-31 16:29:55 +02:00
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <sys/mount.h>
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#include <errno.h>
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#include <sys/stat.h>
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#include <stdlib.h>
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#include <string.h>
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#include <libgen.h>
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#include <assert.h>
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2010-10-27 05:47:48 +02:00
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#include <unistd.h>
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2010-11-08 04:59:39 +01:00
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#include <ftw.h>
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2010-03-31 16:29:55 +02:00
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#include "mount-setup.h"
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2012-04-17 22:25:24 +02:00
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#include "dev-setup.h"
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2010-03-31 16:29:55 +02:00
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#include "log.h"
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2010-04-08 01:43:07 +02:00
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#include "macro.h"
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#include "util.h"
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2010-09-15 01:38:07 +02:00
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#include "label.h"
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2011-08-23 00:37:35 +02:00
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#include "set.h"
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#include "strv.h"
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2012-04-10 21:54:31 +02:00
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#include "mkdir.h"
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2012-05-07 21:36:12 +02:00
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#include "path-util.h"
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2012-06-01 21:25:29 +02:00
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#include "missing.h"
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2012-09-18 12:05:47 +02:00
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#include "virt.h"
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2013-01-19 04:41:33 +01:00
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#include "efivars.h"
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2013-10-09 19:52:15 +02:00
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#include "smack-util.h"
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2014-01-20 19:54:51 +01:00
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#include "def.h"
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2011-01-04 01:58:38 +01:00
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2012-11-04 17:03:48 +01:00
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typedef enum MountMode {
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MNT_NONE = 0,
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MNT_FATAL = 1 << 0,
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MNT_IN_CONTAINER = 1 << 1,
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} MountMode;
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2010-04-12 21:58:01 +02:00
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typedef struct MountPoint {
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const char *what;
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const char *where;
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const char *type;
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const char *options;
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unsigned long flags;
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2012-11-04 17:03:48 +01:00
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bool (*condition_fn)(void);
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MountMode mode;
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2010-04-12 21:58:01 +02:00
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} MountPoint;
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2011-07-29 01:48:18 +02:00
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/* The first three entries we might need before SELinux is up. The
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2012-03-15 19:06:10 +01:00
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* fourth (securityfs) is needed by IMA to load a custom policy. The
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* other ones we can delay until SELinux and IMA are loaded. */
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2013-03-07 20:06:58 +01:00
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#define N_EARLY_MOUNT 5
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2011-07-29 01:48:18 +02:00
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2010-04-12 21:58:01 +02:00
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static const MountPoint mount_table[] = {
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2012-11-04 17:03:48 +01:00
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{ "proc", "/proc", "proc", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV,
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NULL, MNT_FATAL|MNT_IN_CONTAINER },
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{ "sysfs", "/sys", "sysfs", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV,
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NULL, MNT_FATAL|MNT_IN_CONTAINER },
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{ "devtmpfs", "/dev", "devtmpfs", "mode=755", MS_NOSUID|MS_STRICTATIME,
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NULL, MNT_FATAL|MNT_IN_CONTAINER },
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{ "securityfs", "/sys/kernel/security", "securityfs", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV,
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NULL, MNT_NONE },
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2013-09-26 23:41:09 +02:00
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#ifdef HAVE_SMACK
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2013-10-09 19:52:15 +02:00
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{ "smackfs", "/sys/fs/smackfs", "smackfs", "smackfsdef=*", MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_STRICTATIME,
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use_smack, MNT_FATAL },
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2013-09-26 23:41:09 +02:00
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{ "tmpfs", "/dev/shm", "tmpfs", "mode=1777,smackfsroot=*", MS_NOSUID|MS_NODEV|MS_STRICTATIME,
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2013-10-09 19:52:15 +02:00
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use_smack, MNT_FATAL },
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2013-09-26 23:41:09 +02:00
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#endif
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2012-11-04 17:03:48 +01:00
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{ "tmpfs", "/dev/shm", "tmpfs", "mode=1777", MS_NOSUID|MS_NODEV|MS_STRICTATIME,
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NULL, MNT_FATAL|MNT_IN_CONTAINER },
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{ "devpts", "/dev/pts", "devpts", "mode=620,gid=" STRINGIFY(TTY_GID), MS_NOSUID|MS_NOEXEC,
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NULL, MNT_IN_CONTAINER },
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2013-09-26 23:41:09 +02:00
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#ifdef HAVE_SMACK
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{ "tmpfs", "/run", "tmpfs", "mode=755,smackfsroot=*", MS_NOSUID|MS_NODEV|MS_STRICTATIME,
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2013-10-09 19:52:15 +02:00
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use_smack, MNT_FATAL },
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2013-09-26 23:41:09 +02:00
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#endif
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2012-11-04 17:03:48 +01:00
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{ "tmpfs", "/run", "tmpfs", "mode=755", MS_NOSUID|MS_NODEV|MS_STRICTATIME,
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NULL, MNT_FATAL|MNT_IN_CONTAINER },
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{ "tmpfs", "/sys/fs/cgroup", "tmpfs", "mode=755", MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_STRICTATIME,
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NULL, MNT_IN_CONTAINER },
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2013-04-23 02:39:03 +02:00
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#ifdef HAVE_XATTR
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{ "cgroup", "/sys/fs/cgroup/systemd", "cgroup", "none,name=systemd,xattr", MS_NOSUID|MS_NOEXEC|MS_NODEV,
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NULL, MNT_IN_CONTAINER },
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#endif
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{ "cgroup", "/sys/fs/cgroup/systemd", "cgroup", "none,name=systemd", MS_NOSUID|MS_NOEXEC|MS_NODEV,
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2012-11-04 17:03:48 +01:00
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NULL, MNT_IN_CONTAINER },
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2013-02-27 13:07:09 +01:00
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{ "pstore", "/sys/fs/pstore", "pstore", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV,
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NULL, MNT_NONE },
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#ifdef ENABLE_EFI
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{ "efivarfs", "/sys/firmware/efi/efivars", "efivarfs", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV,
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is_efi_boot, MNT_NONE },
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#endif
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2010-03-31 16:29:55 +02:00
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};
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2010-07-16 02:56:57 +02:00
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/* These are API file systems that might be mounted by other software,
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2010-11-24 22:27:45 +01:00
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* we just list them here so that we know that we should ignore them */
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2010-07-16 02:56:57 +02:00
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2012-04-22 01:00:57 +02:00
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static const char ignore_paths[] =
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/* SELinux file systems */
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"/sys/fs/selinux\0"
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"/selinux\0"
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/* Legacy cgroup mount points */
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"/dev/cgroup\0"
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"/cgroup\0"
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/* Legacy kernel file system */
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"/proc/bus/usb\0"
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/* Container bind mounts */
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"/proc/sys\0"
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"/dev/console\0"
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2012-09-18 12:05:47 +02:00
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"/proc/kmsg\0";
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2010-07-16 02:56:57 +02:00
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2010-04-10 17:42:00 +02:00
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bool mount_point_is_api(const char *path) {
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unsigned i;
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/* Checks if this mount point is considered "API", and hence
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* should be ignored */
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2010-04-12 21:58:01 +02:00
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for (i = 0; i < ELEMENTSOF(mount_table); i ++)
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2010-08-20 03:26:15 +02:00
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if (path_equal(path, mount_table[i].where))
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2010-04-10 17:42:00 +02:00
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return true;
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2010-11-11 11:15:16 +01:00
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return path_startswith(path, "/sys/fs/cgroup/");
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}
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bool mount_point_ignore(const char *path) {
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2012-04-22 01:00:57 +02:00
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const char *i;
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2010-11-11 11:15:16 +01:00
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2012-04-22 01:00:57 +02:00
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NULSTR_FOREACH(i, ignore_paths)
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if (path_equal(path, i))
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2010-07-16 02:56:57 +02:00
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return true;
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2010-11-11 11:15:16 +01:00
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return false;
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2010-04-10 17:42:00 +02:00
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}
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2011-07-29 01:48:18 +02:00
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static int mount_one(const MountPoint *p, bool relabel) {
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2010-03-31 16:29:55 +02:00
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int r;
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2010-04-12 21:58:01 +02:00
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assert(p);
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2010-03-31 16:29:55 +02:00
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2012-11-04 17:03:48 +01:00
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if (p->condition_fn && !p->condition_fn())
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return 0;
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2011-04-06 23:38:01 +02:00
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/* Relabel first, just in case */
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2011-07-29 01:48:18 +02:00
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if (relabel)
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2012-07-03 16:25:50 +02:00
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label_fix(p->where, true, true);
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2011-04-06 23:38:01 +02:00
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2012-09-18 12:05:47 +02:00
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r = path_is_mount_point(p->where, true);
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if (r < 0)
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2010-03-31 16:29:55 +02:00
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return r;
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if (r > 0)
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2011-04-06 23:38:01 +02:00
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return 0;
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2010-03-31 16:29:55 +02:00
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2012-09-18 12:05:47 +02:00
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/* Skip securityfs in a container */
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2012-11-04 17:03:48 +01:00
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if (!(p->mode & MNT_IN_CONTAINER) && detect_container(NULL) > 0)
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2012-09-18 12:05:47 +02:00
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return 0;
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2010-04-06 21:55:58 +02:00
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/* The access mode here doesn't really matter too much, since
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* the mounted file system will take precedence anyway. */
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2012-05-31 12:40:20 +02:00
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mkdir_p_label(p->where, 0755);
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2010-04-06 21:55:58 +02:00
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2010-03-31 16:29:55 +02:00
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log_debug("Mounting %s to %s of type %s with options %s.",
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2010-04-12 21:58:01 +02:00
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p->what,
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p->where,
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p->type,
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strna(p->options));
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if (mount(p->what,
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p->where,
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p->type,
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p->flags,
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p->options) < 0) {
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2013-11-26 09:38:02 +01:00
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log_full((p->mode & MNT_FATAL) ? LOG_ERR : LOG_DEBUG, "Failed to mount %s: %m", p->where);
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2012-11-04 17:03:48 +01:00
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return (p->mode & MNT_FATAL) ? -errno : 0;
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2010-03-31 16:29:55 +02:00
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}
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2011-04-06 23:38:01 +02:00
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/* Relabel again, since we now mounted something fresh here */
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2011-07-29 01:48:18 +02:00
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if (relabel)
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2012-07-03 16:25:50 +02:00
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label_fix(p->where, false, false);
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2010-09-15 01:38:07 +02:00
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2011-08-23 00:37:35 +02:00
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return 1;
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2010-03-31 16:29:55 +02:00
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}
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2011-07-29 01:48:18 +02:00
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int mount_setup_early(void) {
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unsigned i;
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int r = 0;
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assert_cc(N_EARLY_MOUNT <= ELEMENTSOF(mount_table));
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/* Do a minimal mount of /proc and friends to enable the most
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* basic stuff, such as SELinux */
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for (i = 0; i < N_EARLY_MOUNT; i ++) {
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int j;
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j = mount_one(mount_table + i, false);
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if (r == 0)
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r = j;
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}
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return r;
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}
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2011-08-23 00:37:35 +02:00
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int mount_cgroup_controllers(char ***join_controllers) {
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2013-04-23 14:28:10 +02:00
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_cleanup_set_free_free_ Set *controllers = NULL;
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_cleanup_fclose_ FILE *f;
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2014-03-18 04:06:36 +01:00
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char buf[LINE_MAX];
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int r;
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2010-04-16 23:22:32 +02:00
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2010-05-18 03:10:17 +02:00
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/* Mount all available cgroup controllers that are built into the kernel. */
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2010-04-16 23:22:32 +02:00
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2011-08-23 00:37:35 +02:00
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f = fopen("/proc/cgroups", "re");
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if (!f) {
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2011-04-26 21:12:36 +02:00
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log_error("Failed to enumerate cgroup controllers: %m");
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return 0;
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}
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2010-04-16 23:22:32 +02:00
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2011-08-23 00:37:35 +02:00
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controllers = set_new(string_hash_func, string_compare_func);
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2013-04-23 14:28:10 +02:00
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if (!controllers)
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return log_oom();
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2011-08-23 00:37:35 +02:00
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2010-04-16 23:22:32 +02:00
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/* Ignore the header line */
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2010-05-10 03:34:31 +02:00
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(void) fgets(buf, sizeof(buf), f);
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2010-04-16 23:22:32 +02:00
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for (;;) {
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2011-08-23 00:37:35 +02:00
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char *controller;
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int enabled = 0;
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2010-04-16 23:22:32 +02:00
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2010-11-22 11:06:38 +01:00
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if (fscanf(f, "%ms %*i %*i %i", &controller, &enabled) != 2) {
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2010-04-16 23:22:32 +02:00
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if (feof(f))
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break;
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log_error("Failed to parse /proc/cgroups.");
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2013-04-23 14:28:10 +02:00
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return -EIO;
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2010-04-16 23:22:32 +02:00
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}
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2010-11-21 22:29:10 +01:00
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if (!enabled) {
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free(controller);
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continue;
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}
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2013-04-23 05:12:15 +02:00
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r = set_consume(controllers, controller);
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2011-08-23 00:37:35 +02:00
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if (r < 0) {
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log_error("Failed to add controller to set.");
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2013-04-23 14:28:10 +02:00
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return r;
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2011-08-23 00:37:35 +02:00
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}
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}
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for (;;) {
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2014-03-18 04:06:36 +01:00
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_cleanup_free_ char *options = NULL, *controller = NULL, *where = NULL;
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2013-04-23 14:28:10 +02:00
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MountPoint p = {
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.what = "cgroup",
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.type = "cgroup",
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.flags = MS_NOSUID|MS_NOEXEC|MS_NODEV,
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.mode = MNT_IN_CONTAINER,
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};
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2011-08-23 00:37:35 +02:00
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char ***k = NULL;
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controller = set_steal_first(controllers);
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if (!controller)
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break;
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|
|
|
|
|
|
|
if (join_controllers)
|
|
|
|
for (k = join_controllers; *k; k++)
|
|
|
|
if (strv_find(*k, controller))
|
|
|
|
break;
|
|
|
|
|
|
|
|
if (k && *k) {
|
|
|
|
char **i, **j;
|
|
|
|
|
|
|
|
for (i = *k, j = *k; *i; i++) {
|
|
|
|
|
|
|
|
if (!streq(*i, controller)) {
|
2014-03-18 04:06:36 +01:00
|
|
|
_cleanup_free_ char *t;
|
2011-08-23 00:37:35 +02:00
|
|
|
|
|
|
|
t = set_remove(controllers, *i);
|
|
|
|
if (!t) {
|
|
|
|
free(*i);
|
|
|
|
continue;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
*(j++) = *i;
|
|
|
|
}
|
|
|
|
|
|
|
|
*j = NULL;
|
|
|
|
|
|
|
|
options = strv_join(*k, ",");
|
2013-04-23 14:28:10 +02:00
|
|
|
if (!options)
|
|
|
|
return log_oom();
|
2011-08-23 00:37:35 +02:00
|
|
|
} else {
|
|
|
|
options = controller;
|
|
|
|
controller = NULL;
|
|
|
|
}
|
|
|
|
|
2014-03-18 04:06:36 +01:00
|
|
|
where = strappend("/sys/fs/cgroup/", options);
|
|
|
|
if (!where)
|
|
|
|
return log_oom();
|
|
|
|
|
|
|
|
p.where = where;
|
2011-08-23 00:37:35 +02:00
|
|
|
p.options = options;
|
2010-04-16 23:22:32 +02:00
|
|
|
|
2011-07-29 01:48:18 +02:00
|
|
|
r = mount_one(&p, true);
|
2013-04-23 14:28:10 +02:00
|
|
|
if (r < 0)
|
|
|
|
return r;
|
2011-08-23 00:37:35 +02:00
|
|
|
|
|
|
|
if (r > 0 && k && *k) {
|
|
|
|
char **i;
|
|
|
|
|
|
|
|
for (i = *k; *i; i++) {
|
2014-03-18 04:06:36 +01:00
|
|
|
_cleanup_free_ char *t = NULL;
|
|
|
|
|
|
|
|
t = strappend("/sys/fs/cgroup/", *i);
|
|
|
|
if (!t)
|
|
|
|
return log_oom();
|
2011-08-23 00:37:35 +02:00
|
|
|
|
|
|
|
r = symlink(options, t);
|
|
|
|
if (r < 0 && errno != EEXIST) {
|
2013-04-23 02:51:29 +02:00
|
|
|
log_error("Failed to create symlink %s: %m", t);
|
2013-04-23 14:28:10 +02:00
|
|
|
return -errno;
|
2011-08-23 00:37:35 +02:00
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
2010-04-16 23:22:32 +02:00
|
|
|
}
|
|
|
|
|
2013-04-23 14:28:10 +02:00
|
|
|
return 0;
|
2010-04-16 23:22:32 +02:00
|
|
|
}
|
|
|
|
|
2010-11-08 04:59:39 +01:00
|
|
|
static int nftw_cb(
|
|
|
|
const char *fpath,
|
|
|
|
const struct stat *sb,
|
|
|
|
int tflag,
|
|
|
|
struct FTW *ftwbuf) {
|
|
|
|
|
2010-11-11 01:22:42 +01:00
|
|
|
/* No need to label /dev twice in a row... */
|
2011-08-30 00:16:00 +02:00
|
|
|
if (_unlikely_(ftwbuf->level == 0))
|
|
|
|
return FTW_CONTINUE;
|
|
|
|
|
2012-07-03 16:25:50 +02:00
|
|
|
label_fix(fpath, false, false);
|
2011-08-30 18:49:17 +02:00
|
|
|
|
2011-08-30 00:16:00 +02:00
|
|
|
/* /run/initramfs is static data and big, no need to
|
2011-08-30 18:49:17 +02:00
|
|
|
* dynamically relabel its contents at boot... */
|
2011-08-30 00:16:00 +02:00
|
|
|
if (_unlikely_(ftwbuf->level == 1 &&
|
|
|
|
tflag == FTW_D &&
|
|
|
|
streq(fpath, "/run/initramfs")))
|
|
|
|
return FTW_SKIP_SUBTREE;
|
2010-11-11 01:22:42 +01:00
|
|
|
|
2011-08-30 00:16:00 +02:00
|
|
|
return FTW_CONTINUE;
|
2010-11-08 04:59:39 +01:00
|
|
|
};
|
|
|
|
|
2011-07-28 23:52:23 +02:00
|
|
|
int mount_setup(bool loaded_policy) {
|
2010-03-31 16:29:55 +02:00
|
|
|
int r;
|
2010-04-10 17:42:00 +02:00
|
|
|
unsigned i;
|
2010-03-31 16:29:55 +02:00
|
|
|
|
2011-07-29 01:48:18 +02:00
|
|
|
for (i = 0; i < ELEMENTSOF(mount_table); i ++) {
|
|
|
|
r = mount_one(mount_table + i, true);
|
|
|
|
|
|
|
|
if (r < 0)
|
2010-03-31 16:29:55 +02:00
|
|
|
return r;
|
2011-07-29 01:48:18 +02:00
|
|
|
}
|
2010-03-31 16:29:55 +02:00
|
|
|
|
2011-04-07 21:22:41 +02:00
|
|
|
/* Nodes in devtmpfs and /run need to be manually updated for
|
|
|
|
* the appropriate labels, after mounting. The other virtual
|
|
|
|
* API file systems like /sys and /proc do not need that, they
|
|
|
|
* use the same label for all their files. */
|
2011-07-28 23:52:23 +02:00
|
|
|
if (loaded_policy) {
|
|
|
|
usec_t before_relabel, after_relabel;
|
|
|
|
char timespan[FORMAT_TIMESPAN_MAX];
|
|
|
|
|
|
|
|
before_relabel = now(CLOCK_MONOTONIC);
|
|
|
|
|
2011-08-30 00:16:00 +02:00
|
|
|
nftw("/dev", nftw_cb, 64, FTW_MOUNT|FTW_PHYS|FTW_ACTIONRETVAL);
|
|
|
|
nftw("/run", nftw_cb, 64, FTW_MOUNT|FTW_PHYS|FTW_ACTIONRETVAL);
|
2011-07-28 23:52:23 +02:00
|
|
|
|
|
|
|
after_relabel = now(CLOCK_MONOTONIC);
|
|
|
|
|
|
|
|
log_info("Relabelled /dev and /run in %s.",
|
2013-04-04 02:56:56 +02:00
|
|
|
format_timespan(timespan, sizeof(timespan), after_relabel - before_relabel, 0));
|
2011-04-04 16:56:51 +02:00
|
|
|
}
|
2010-11-08 04:59:39 +01:00
|
|
|
|
2010-10-27 05:47:48 +02:00
|
|
|
/* Create a few default symlinks, which are normally created
|
2011-04-07 21:22:41 +02:00
|
|
|
* by udevd, but some scripts might need them before we start
|
2010-10-27 05:47:48 +02:00
|
|
|
* udevd. */
|
2012-08-21 17:23:03 +02:00
|
|
|
dev_setup(NULL);
|
2010-10-27 05:47:48 +02:00
|
|
|
|
2012-08-06 18:28:42 +02:00
|
|
|
/* Mark the root directory as shared in regards to mount
|
|
|
|
* propagation. The kernel defaults to "private", but we think
|
|
|
|
* it makes more sense to have a default of "shared" so that
|
|
|
|
* nspawn and the container tools work out of the box. If
|
|
|
|
* specific setups need other settings they can reset the
|
|
|
|
* propagation mode to private if needed. */
|
2012-09-18 12:05:47 +02:00
|
|
|
if (detect_container(NULL) <= 0)
|
|
|
|
if (mount(NULL, "/", NULL, MS_REC|MS_SHARED, NULL) < 0)
|
|
|
|
log_warning("Failed to set up the root directory for shared mount propagation: %m");
|
2012-08-06 18:28:42 +02:00
|
|
|
|
sd-booted: update sd_booted() check a bit
Previously we were testing whether /sys/fs/cgroup/systemd/ was a mount
point. This might be problematic however, when the cgroup trees are bind
mounted into a container from the host (which should be absolutely
valid), which might create the impression that the container was running
systemd, but only the host actually is.
Replace this by a check for the existance of the directory
/run/systemd/system/, which should work unconditionally, since /run can
never be a bind mount but *must* be a tmpfs on systemd systems, which is
flushed at boots. This means that data in /run always reflects
information about the current boot, and only of the local container,
which makes it the perfect choice for a check like this.
(As side effect this is nice to Ubuntu people who now use logind with
the systemd cgroup hierarchy, where the old sd_booted() check misdetects
systemd, even though they still run legacy Upstart.)
2013-03-15 16:41:40 +01:00
|
|
|
/* Create a few directories we always want around, Note that
|
|
|
|
* sd_booted() checks for /run/systemd/system, so this mkdir
|
|
|
|
* really needs to stay for good, otherwise software that
|
|
|
|
* copied sd-daemon.c into their sources will misdetect
|
|
|
|
* systemd. */
|
2012-05-31 12:40:20 +02:00
|
|
|
mkdir_label("/run/systemd", 0755);
|
|
|
|
mkdir_label("/run/systemd/system", 0755);
|
2013-03-14 18:12:27 +01:00
|
|
|
mkdir_label("/run/systemd/inaccessible", 0000);
|
2011-03-09 22:45:47 +01:00
|
|
|
|
2011-08-23 00:37:35 +02:00
|
|
|
return 0;
|
2010-03-31 16:29:55 +02:00
|
|
|
}
|