src/nspawn/nspawn.h \
src/nspawn/nspawn-settings.c \
src/nspawn/nspawn-settings.h \
+ src/nspawn/nspawn-mount.c \
+ src/nspawn/nspawn-mount.h \
src/core/mount-setup.c \
src/core/mount-setup.h \
src/core/loopback-setup.c \
--- /dev/null
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+ This file is part of systemd.
+
+ Copyright 2015 Lennart Poettering
+
+ systemd 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.
+
+ systemd 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 systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <sys/mount.h>
+
+#include "util.h"
+#include "rm-rf.h"
+#include "strv.h"
+#include "path-util.h"
+#include "mkdir.h"
+#include "label.h"
+#include "set.h"
+#include "cgroup-util.h"
+
+#include "nspawn.h"
+#include "nspawn-mount.h"
+
+CustomMount* custom_mount_add(CustomMount **l, unsigned *n, CustomMountType t) {
+ CustomMount *c, *ret;
+
+ assert(l);
+ assert(n);
+ assert(t >= 0);
+ assert(t < _CUSTOM_MOUNT_TYPE_MAX);
+
+ c = realloc(*l, (*n + 1) * sizeof(CustomMount));
+ if (!c)
+ return NULL;
+
+ *l = c;
+ ret = *l + *n;
+ (*n)++;
+
+ *ret = (CustomMount) { .type = t };
+
+ return ret;
+}
+
+void custom_mount_free_all(CustomMount *l, unsigned n) {
+ unsigned i;
+
+ for (i = 0; i < n; i++) {
+ CustomMount *m = l + i;
+
+ free(m->source);
+ free(m->destination);
+ free(m->options);
+
+ if (m->work_dir) {
+ (void) rm_rf(m->work_dir, REMOVE_ROOT|REMOVE_PHYSICAL);
+ free(m->work_dir);
+ }
+
+ strv_free(m->lower);
+ }
+
+ free(l);
+}
+
+int custom_mount_compare(const void *a, const void *b) {
+ const CustomMount *x = a, *y = b;
+ int r;
+
+ r = path_compare(x->destination, y->destination);
+ if (r != 0)
+ return r;
+
+ if (x->type < y->type)
+ return -1;
+ if (x->type > y->type)
+ return 1;
+
+ return 0;
+}
+
+int bind_mount_parse(CustomMount **l, unsigned *n, const char *s, bool read_only) {
+ _cleanup_free_ char *source = NULL, *destination = NULL, *opts = NULL;
+ const char *p = s;
+ CustomMount *m;
+ int r;
+
+ assert(l);
+ assert(n);
+
+ r = extract_many_words(&p, ":", EXTRACT_DONT_COALESCE_SEPARATORS, &source, &destination, NULL);
+ if (r < 0)
+ return r;
+ if (r == 0)
+ return -EINVAL;
+
+ if (r == 1) {
+ destination = strdup(source);
+ if (!destination)
+ return -ENOMEM;
+ }
+
+ if (r == 2 && !isempty(p)) {
+ opts = strdup(p);
+ if (!opts)
+ return -ENOMEM;
+ }
+
+ if (!path_is_absolute(source))
+ return -EINVAL;
+
+ if (!path_is_absolute(destination))
+ return -EINVAL;
+
+ m = custom_mount_add(l, n, CUSTOM_MOUNT_BIND);
+ if (!m)
+ return log_oom();
+
+ m->source = source;
+ m->destination = destination;
+ m->read_only = read_only;
+ m->options = opts;
+
+ source = destination = opts = NULL;
+ return 0;
+}
+
+int tmpfs_mount_parse(CustomMount **l, unsigned *n, const char *s) {
+ _cleanup_free_ char *path = NULL, *opts = NULL;
+ const char *p = s;
+ CustomMount *m;
+ int r;
+
+ assert(l);
+ assert(n);
+ assert(s);
+
+ r = extract_first_word(&p, &path, ":", EXTRACT_DONT_COALESCE_SEPARATORS);
+ if (r < 0)
+ return r;
+ if (r == 0)
+ return -EINVAL;
+
+ if (isempty(p))
+ opts = strdup("mode=0755");
+ else
+ opts = strdup(p);
+ if (!opts)
+ return -ENOMEM;
+
+ if (!path_is_absolute(path))
+ return -EINVAL;
+
+ m = custom_mount_add(l, n, CUSTOM_MOUNT_TMPFS);
+ if (!m)
+ return -ENOMEM;
+
+ m->destination = path;
+ m->options = opts;
+
+ path = opts = NULL;
+ return 0;
+}
+
+static int tmpfs_patch_options(
+ const char *options,
+ bool userns, uid_t uid_shift, uid_t uid_range,
+ const char *selinux_apifs_context,
+ char **ret) {
+
+ char *buf = NULL;
+
+ if (userns && uid_shift != 0) {
+ assert(uid_shift != UID_INVALID);
+
+ if (options)
+ (void) asprintf(&buf, "%s,uid=" UID_FMT ",gid=" UID_FMT, options, uid_shift, uid_shift);
+ else
+ (void) asprintf(&buf, "uid=" UID_FMT ",gid=" UID_FMT, uid_shift, uid_shift);
+ if (!buf)
+ return -ENOMEM;
+
+ options = buf;
+ }
+
+#ifdef HAVE_SELINUX
+ if (selinux_apifs_context) {
+ char *t;
+
+ if (options)
+ t = strjoin(options, ",context=\"", selinux_apifs_context, "\"", NULL);
+ else
+ t = strjoin("context=\"", selinux_apifs_context, "\"", NULL);
+ if (!t) {
+ free(buf);
+ return -ENOMEM;
+ }
+
+ free(buf);
+ buf = t;
+ }
+#endif
+
+ *ret = buf;
+ return !!buf;
+}
+
+int mount_all(const char *dest,
+ bool userns, uid_t uid_shift, uid_t uid_range,
+ const char *selinux_apifs_context) {
+
+ typedef struct MountPoint {
+ const char *what;
+ const char *where;
+ const char *type;
+ const char *options;
+ unsigned long flags;
+ bool fatal;
+ bool userns;
+ } MountPoint;
+
+ static const MountPoint mount_table[] = {
+ { "proc", "/proc", "proc", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV, true, true },
+ { "/proc/sys", "/proc/sys", NULL, NULL, MS_BIND, true, true }, /* Bind mount first */
+ { NULL, "/proc/sys", NULL, NULL, MS_BIND|MS_RDONLY|MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_REMOUNT, true, true }, /* Then, make it r/o */
+ { "sysfs", "/sys", "sysfs", NULL, MS_RDONLY|MS_NOSUID|MS_NOEXEC|MS_NODEV, true, false },
+ { "tmpfs", "/dev", "tmpfs", "mode=755", MS_NOSUID|MS_STRICTATIME, true, false },
+ { "tmpfs", "/dev/shm", "tmpfs", "mode=1777", MS_NOSUID|MS_NODEV|MS_STRICTATIME, true, false },
+ { "tmpfs", "/run", "tmpfs", "mode=755", MS_NOSUID|MS_NODEV|MS_STRICTATIME, true, false },
+ { "tmpfs", "/tmp", "tmpfs", "mode=1777", MS_STRICTATIME, true, false },
+#ifdef HAVE_SELINUX
+ { "/sys/fs/selinux", "/sys/fs/selinux", NULL, NULL, MS_BIND, false, false }, /* Bind mount first */
+ { NULL, "/sys/fs/selinux", NULL, NULL, MS_BIND|MS_RDONLY|MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_REMOUNT, false, false }, /* Then, make it r/o */
+#endif
+ };
+
+ unsigned k;
+ int r;
+
+ for (k = 0; k < ELEMENTSOF(mount_table); k++) {
+ _cleanup_free_ char *where = NULL, *options = NULL;
+ const char *o;
+
+ if (userns != mount_table[k].userns)
+ continue;
+
+ where = prefix_root(dest, mount_table[k].where);
+ if (!where)
+ return log_oom();
+
+ r = path_is_mount_point(where, AT_SYMLINK_FOLLOW);
+ if (r < 0 && r != -ENOENT)
+ return log_error_errno(r, "Failed to detect whether %s is a mount point: %m", where);
+
+ /* Skip this entry if it is not a remount. */
+ if (mount_table[k].what && r > 0)
+ continue;
+
+ r = mkdir_p(where, 0755);
+ if (r < 0) {
+ if (mount_table[k].fatal)
+ return log_error_errno(r, "Failed to create directory %s: %m", where);
+
+ log_warning_errno(r, "Failed to create directory %s: %m", where);
+ continue;
+ }
+
+ o = mount_table[k].options;
+ if (streq_ptr(mount_table[k].type, "tmpfs")) {
+ r = tmpfs_patch_options(o, userns, uid_shift, uid_range, selinux_apifs_context, &options);
+ if (r < 0)
+ return log_oom();
+ if (r > 0)
+ o = options;
+ }
+
+ if (mount(mount_table[k].what,
+ where,
+ mount_table[k].type,
+ mount_table[k].flags,
+ o) < 0) {
+
+ if (mount_table[k].fatal)
+ return log_error_errno(errno, "mount(%s) failed: %m", where);
+
+ log_warning_errno(errno, "mount(%s) failed, ignoring: %m", where);
+ }
+ }
+
+ return 0;
+}
+
+static int parse_mount_bind_options(const char *options, unsigned long *mount_flags, char **mount_opts) {
+ const char *p = options;
+ unsigned long flags = *mount_flags;
+ char *opts = NULL;
+
+ assert(options);
+
+ for (;;) {
+ _cleanup_free_ char *word = NULL;
+ int r = extract_first_word(&p, &word, ",", 0);
+ if (r < 0)
+ return log_error_errno(r, "Failed to extract mount option: %m");
+ if (r == 0)
+ break;
+
+ if (streq(word, "rbind"))
+ flags |= MS_REC;
+ else if (streq(word, "norbind"))
+ flags &= ~MS_REC;
+ else {
+ log_error("Invalid bind mount option: %s", word);
+ return -EINVAL;
+ }
+ }
+
+ *mount_flags = flags;
+ /* in the future mount_opts will hold string options for mount(2) */
+ *mount_opts = opts;
+
+ return 0;
+}
+
+static int mount_bind(const char *dest, CustomMount *m) {
+ struct stat source_st, dest_st;
+ const char *where;
+ unsigned long mount_flags = MS_BIND | MS_REC;
+ _cleanup_free_ char *mount_opts = NULL;
+ int r;
+
+ assert(m);
+
+ if (m->options) {
+ r = parse_mount_bind_options(m->options, &mount_flags, &mount_opts);
+ if (r < 0)
+ return r;
+ }
+
+ if (stat(m->source, &source_st) < 0)
+ return log_error_errno(errno, "Failed to stat %s: %m", m->source);
+
+ where = prefix_roota(dest, m->destination);
+
+ if (stat(where, &dest_st) >= 0) {
+ if (S_ISDIR(source_st.st_mode) && !S_ISDIR(dest_st.st_mode)) {
+ log_error("Cannot bind mount directory %s on file %s.", m->source, where);
+ return -EINVAL;
+ }
+
+ if (!S_ISDIR(source_st.st_mode) && S_ISDIR(dest_st.st_mode)) {
+ log_error("Cannot bind mount file %s on directory %s.", m->source, where);
+ return -EINVAL;
+ }
+
+ } else if (errno == ENOENT) {
+ r = mkdir_parents_label(where, 0755);
+ if (r < 0)
+ return log_error_errno(r, "Failed to make parents of %s: %m", where);
+ } else {
+ log_error_errno(errno, "Failed to stat %s: %m", where);
+ return -errno;
+ }
+
+ /* Create the mount point. Any non-directory file can be
+ * mounted on any non-directory file (regular, fifo, socket,
+ * char, block).
+ */
+ if (S_ISDIR(source_st.st_mode))
+ r = mkdir_label(where, 0755);
+ else
+ r = touch(where);
+ if (r < 0 && r != -EEXIST)
+ return log_error_errno(r, "Failed to create mount point %s: %m", where);
+
+ if (mount(m->source, where, NULL, mount_flags, mount_opts) < 0)
+ return log_error_errno(errno, "mount(%s) failed: %m", where);
+
+ if (m->read_only) {
+ r = bind_remount_recursive(where, true);
+ if (r < 0)
+ return log_error_errno(r, "Read-only bind mount failed: %m");
+ }
+
+ return 0;
+}
+
+static int mount_tmpfs(
+ const char *dest,
+ CustomMount *m,
+ bool userns, uid_t uid_shift, uid_t uid_range,
+ const char *selinux_apifs_context) {
+
+ const char *where, *options;
+ _cleanup_free_ char *buf = NULL;
+ int r;
+
+ assert(dest);
+ assert(m);
+
+ where = prefix_roota(dest, m->destination);
+
+ r = mkdir_p_label(where, 0755);
+ if (r < 0 && r != -EEXIST)
+ return log_error_errno(r, "Creating mount point for tmpfs %s failed: %m", where);
+
+ r = tmpfs_patch_options(m->options, userns, uid_shift, uid_range, selinux_apifs_context, &buf);
+ if (r < 0)
+ return log_oom();
+ options = r > 0 ? buf : m->options;
+
+ if (mount("tmpfs", where, "tmpfs", MS_NODEV|MS_STRICTATIME, options) < 0)
+ return log_error_errno(errno, "tmpfs mount to %s failed: %m", where);
+
+ return 0;
+}
+
+static char *joined_and_escaped_lower_dirs(char * const *lower) {
+ _cleanup_strv_free_ char **sv = NULL;
+
+ sv = strv_copy(lower);
+ if (!sv)
+ return NULL;
+
+ strv_reverse(sv);
+
+ if (!strv_shell_escape(sv, ",:"))
+ return NULL;
+
+ return strv_join(sv, ":");
+}
+
+static int mount_overlay(const char *dest, CustomMount *m) {
+ _cleanup_free_ char *lower = NULL;
+ const char *where, *options;
+ int r;
+
+ assert(dest);
+ assert(m);
+
+ where = prefix_roota(dest, m->destination);
+
+ r = mkdir_label(where, 0755);
+ if (r < 0 && r != -EEXIST)
+ return log_error_errno(r, "Creating mount point for overlay %s failed: %m", where);
+
+ (void) mkdir_p_label(m->source, 0755);
+
+ lower = joined_and_escaped_lower_dirs(m->lower);
+ if (!lower)
+ return log_oom();
+
+ if (m->read_only) {
+ _cleanup_free_ char *escaped_source = NULL;
+
+ escaped_source = shell_escape(m->source, ",:");
+ if (!escaped_source)
+ return log_oom();
+
+ options = strjoina("lowerdir=", escaped_source, ":", lower);
+ } else {
+ _cleanup_free_ char *escaped_source = NULL, *escaped_work_dir = NULL;
+
+ assert(m->work_dir);
+ (void) mkdir_label(m->work_dir, 0700);
+
+ escaped_source = shell_escape(m->source, ",:");
+ if (!escaped_source)
+ return log_oom();
+ escaped_work_dir = shell_escape(m->work_dir, ",:");
+ if (!escaped_work_dir)
+ return log_oom();
+
+ options = strjoina("lowerdir=", lower, ",upperdir=", escaped_source, ",workdir=", escaped_work_dir);
+ }
+
+ if (mount("overlay", where, "overlay", m->read_only ? MS_RDONLY : 0, options) < 0)
+ return log_error_errno(errno, "overlay mount to %s failed: %m", where);
+
+ return 0;
+}
+
+int mount_custom(
+ const char *dest,
+ CustomMount *mounts, unsigned n,
+ bool userns, uid_t uid_shift, uid_t uid_range,
+ const char *selinux_apifs_context) {
+
+ unsigned i;
+ int r;
+
+ assert(dest);
+
+ for (i = 0; i < n; i++) {
+ CustomMount *m = mounts + i;
+
+ switch (m->type) {
+
+ case CUSTOM_MOUNT_BIND:
+ r = mount_bind(dest, m);
+ break;
+
+ case CUSTOM_MOUNT_TMPFS:
+ r = mount_tmpfs(dest, m, userns, uid_shift, uid_range, selinux_apifs_context);
+ break;
+
+ case CUSTOM_MOUNT_OVERLAY:
+ r = mount_overlay(dest, m);
+ break;
+
+ default:
+ assert_not_reached("Unknown custom mount type");
+ }
+
+ if (r < 0)
+ return r;
+ }
+
+ return 0;
+}
+
+static int mount_legacy_cgroup_hierarchy(const char *dest, const char *controller, const char *hierarchy, bool read_only) {
+ char *to;
+ int r;
+
+ to = strjoina(dest, "/sys/fs/cgroup/", hierarchy);
+
+ r = path_is_mount_point(to, 0);
+ if (r < 0 && r != -ENOENT)
+ return log_error_errno(r, "Failed to determine if %s is mounted already: %m", to);
+ if (r > 0)
+ return 0;
+
+ mkdir_p(to, 0755);
+
+ /* The superblock mount options of the mount point need to be
+ * identical to the hosts', and hence writable... */
+ if (mount("cgroup", to, "cgroup", MS_NOSUID|MS_NOEXEC|MS_NODEV, controller) < 0)
+ return log_error_errno(errno, "Failed to mount to %s: %m", to);
+
+ /* ... hence let's only make the bind mount read-only, not the
+ * superblock. */
+ if (read_only) {
+ if (mount(NULL, to, NULL, MS_BIND|MS_REMOUNT|MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_RDONLY, NULL) < 0)
+ return log_error_errno(errno, "Failed to remount %s read-only: %m", to);
+ }
+ return 1;
+}
+
+static int mount_legacy_cgroups(
+ const char *dest,
+ bool userns, uid_t uid_shift, uid_t uid_range,
+ const char *selinux_apifs_context) {
+
+ _cleanup_set_free_free_ Set *controllers = NULL;
+ const char *cgroup_root;
+ int r;
+
+ cgroup_root = prefix_roota(dest, "/sys/fs/cgroup");
+
+ /* Mount a tmpfs to /sys/fs/cgroup if it's not mounted there yet. */
+ r = path_is_mount_point(cgroup_root, AT_SYMLINK_FOLLOW);
+ if (r < 0)
+ return log_error_errno(r, "Failed to determine if /sys/fs/cgroup is already mounted: %m");
+ if (r == 0) {
+ _cleanup_free_ char *options = NULL;
+
+ r = tmpfs_patch_options("mode=755", userns, uid_shift, uid_range, selinux_apifs_context, &options);
+ if (r < 0)
+ return log_oom();
+
+ if (mount("tmpfs", cgroup_root, "tmpfs", MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_STRICTATIME, options) < 0)
+ return log_error_errno(errno, "Failed to mount /sys/fs/cgroup: %m");
+ }
+
+ if (cg_unified() > 0)
+ goto skip_controllers;
+
+ controllers = set_new(&string_hash_ops);
+ if (!controllers)
+ return log_oom();
+
+ r = cg_kernel_controllers(controllers);
+ if (r < 0)
+ return log_error_errno(r, "Failed to determine cgroup controllers: %m");
+
+ for (;;) {
+ _cleanup_free_ char *controller = NULL, *origin = NULL, *combined = NULL;
+
+ controller = set_steal_first(controllers);
+ if (!controller)
+ break;
+
+ origin = prefix_root("/sys/fs/cgroup/", controller);
+ if (!origin)
+ return log_oom();
+
+ r = readlink_malloc(origin, &combined);
+ if (r == -EINVAL) {
+ /* Not a symbolic link, but directly a single cgroup hierarchy */
+
+ r = mount_legacy_cgroup_hierarchy(dest, controller, controller, true);
+ if (r < 0)
+ return r;
+
+ } else if (r < 0)
+ return log_error_errno(r, "Failed to read link %s: %m", origin);
+ else {
+ _cleanup_free_ char *target = NULL;
+
+ target = prefix_root(dest, origin);
+ if (!target)
+ return log_oom();
+
+ /* A symbolic link, a combination of controllers in one hierarchy */
+
+ if (!filename_is_valid(combined)) {
+ log_warning("Ignoring invalid combined hierarchy %s.", combined);
+ continue;
+ }
+
+ r = mount_legacy_cgroup_hierarchy(dest, combined, combined, true);
+ if (r < 0)
+ return r;
+
+ r = symlink_idempotent(combined, target);
+ if (r == -EINVAL) {
+ log_error("Invalid existing symlink for combined hierarchy");
+ return r;
+ }
+ if (r < 0)
+ return log_error_errno(r, "Failed to create symlink for combined hierarchy: %m");
+ }
+ }
+
+skip_controllers:
+ r = mount_legacy_cgroup_hierarchy(dest, "none,name=systemd,xattr", "systemd", false);
+ if (r < 0)
+ return r;
+
+ if (mount(NULL, cgroup_root, NULL, MS_REMOUNT|MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_STRICTATIME|MS_RDONLY, "mode=755") < 0)
+ return log_error_errno(errno, "Failed to remount %s read-only: %m", cgroup_root);
+
+ return 0;
+}
+
+static int mount_unified_cgroups(const char *dest) {
+ const char *p;
+ int r;
+
+ assert(dest);
+
+ p = strjoina(dest, "/sys/fs/cgroup");
+
+ r = path_is_mount_point(p, AT_SYMLINK_FOLLOW);
+ if (r < 0)
+ return log_error_errno(r, "Failed to determine if %s is mounted already: %m", p);
+ if (r > 0) {
+ p = strjoina(dest, "/sys/fs/cgroup/cgroup.procs");
+ if (access(p, F_OK) >= 0)
+ return 0;
+ if (errno != ENOENT)
+ return log_error_errno(errno, "Failed to determine if mount point %s contains the unified cgroup hierarchy: %m", p);
+
+ log_error("%s is already mounted but not a unified cgroup hierarchy. Refusing.", p);
+ return -EINVAL;
+ }
+
+ if (mount("cgroup", p, "cgroup", MS_NOSUID|MS_NOEXEC|MS_NODEV, "__DEVEL__sane_behavior") < 0)
+ return log_error_errno(errno, "Failed to mount unified cgroup hierarchy to %s: %m", p);
+
+ return 0;
+}
+
+int mount_cgroups(
+ const char *dest,
+ bool unified_requested,
+ bool userns, uid_t uid_shift, uid_t uid_range,
+ const char *selinux_apifs_context) {
+
+ if (unified_requested)
+ return mount_unified_cgroups(dest);
+ else
+ return mount_legacy_cgroups(dest, userns, uid_shift, uid_range, selinux_apifs_context);
+}
+
+int mount_systemd_cgroup_writable(
+ const char *dest,
+ bool unified_requested) {
+
+ _cleanup_free_ char *own_cgroup_path = NULL;
+ const char *systemd_root, *systemd_own;
+ int r;
+
+ assert(dest);
+
+ r = cg_pid_get_path(NULL, 0, &own_cgroup_path);
+ if (r < 0)
+ return log_error_errno(r, "Failed to determine our own cgroup path: %m");
+
+ /* If we are living in the top-level, then there's nothing to do... */
+ if (path_equal(own_cgroup_path, "/"))
+ return 0;
+
+ if (unified_requested) {
+ systemd_own = strjoina(dest, "/sys/fs/cgroup", own_cgroup_path);
+ systemd_root = prefix_roota(dest, "/sys/fs/cgroup");
+ } else {
+ systemd_own = strjoina(dest, "/sys/fs/cgroup/systemd", own_cgroup_path);
+ systemd_root = prefix_roota(dest, "/sys/fs/cgroup/systemd");
+ }
+
+ /* Make our own cgroup a (writable) bind mount */
+ if (mount(systemd_own, systemd_own, NULL, MS_BIND, NULL) < 0)
+ return log_error_errno(errno, "Failed to turn %s into a bind mount: %m", own_cgroup_path);
+
+ /* And then remount the systemd cgroup root read-only */
+ if (mount(NULL, systemd_root, NULL, MS_BIND|MS_REMOUNT|MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_RDONLY, NULL) < 0)
+ return log_error_errno(errno, "Failed to mount cgroup root read-only: %m");
+
+ return 0;
+}
+
+int setup_volatile_state(
+ const char *directory,
+ VolatileMode mode,
+ bool userns, uid_t uid_shift, uid_t uid_range,
+ const char *selinux_apifs_context) {
+
+ _cleanup_free_ char *buf = NULL;
+ const char *p, *options;
+ int r;
+
+ assert(directory);
+
+ if (mode != VOLATILE_STATE)
+ return 0;
+
+ /* --volatile=state means we simply overmount /var
+ with a tmpfs, and the rest read-only. */
+
+ r = bind_remount_recursive(directory, true);
+ if (r < 0)
+ return log_error_errno(r, "Failed to remount %s read-only: %m", directory);
+
+ p = prefix_roota(directory, "/var");
+ r = mkdir(p, 0755);
+ if (r < 0 && errno != EEXIST)
+ return log_error_errno(errno, "Failed to create %s: %m", directory);
+
+ options = "mode=755";
+ r = tmpfs_patch_options(options, userns, uid_shift, uid_range, selinux_apifs_context, &buf);
+ if (r < 0)
+ return log_oom();
+ if (r > 0)
+ options = buf;
+
+ if (mount("tmpfs", p, "tmpfs", MS_STRICTATIME, options) < 0)
+ return log_error_errno(errno, "Failed to mount tmpfs to /var: %m");
+
+ return 0;
+}
+
+int setup_volatile(
+ const char *directory,
+ VolatileMode mode,
+ bool userns, uid_t uid_shift, uid_t uid_range,
+ const char *selinux_apifs_context) {
+
+ bool tmpfs_mounted = false, bind_mounted = false;
+ char template[] = "/tmp/nspawn-volatile-XXXXXX";
+ _cleanup_free_ char *buf = NULL;
+ const char *f, *t, *options;
+ int r;
+
+ assert(directory);
+
+ if (mode != VOLATILE_YES)
+ return 0;
+
+ /* --volatile=yes means we mount a tmpfs to the root dir, and
+ the original /usr to use inside it, and that read-only. */
+
+ if (!mkdtemp(template))
+ return log_error_errno(errno, "Failed to create temporary directory: %m");
+
+ options = "mode=755";
+ r = tmpfs_patch_options(options, userns, uid_shift, uid_range, selinux_apifs_context, &buf);
+ if (r < 0)
+ return log_oom();
+ if (r > 0)
+ options = buf;
+
+ if (mount("tmpfs", template, "tmpfs", MS_STRICTATIME, options) < 0) {
+ r = log_error_errno(errno, "Failed to mount tmpfs for root directory: %m");
+ goto fail;
+ }
+
+ tmpfs_mounted = true;
+
+ f = prefix_roota(directory, "/usr");
+ t = prefix_roota(template, "/usr");
+
+ r = mkdir(t, 0755);
+ if (r < 0 && errno != EEXIST) {
+ r = log_error_errno(errno, "Failed to create %s: %m", t);
+ goto fail;
+ }
+
+ if (mount(f, t, NULL, MS_BIND|MS_REC, NULL) < 0) {
+ r = log_error_errno(errno, "Failed to create /usr bind mount: %m");
+ goto fail;
+ }
+
+ bind_mounted = true;
+
+ r = bind_remount_recursive(t, true);
+ if (r < 0) {
+ log_error_errno(r, "Failed to remount %s read-only: %m", t);
+ goto fail;
+ }
+
+ if (mount(template, directory, NULL, MS_MOVE, NULL) < 0) {
+ r = log_error_errno(errno, "Failed to move root mount: %m");
+ goto fail;
+ }
+
+ (void) rmdir(template);
+
+ return 0;
+
+fail:
+ if (bind_mounted)
+ (void) umount(t);
+
+ if (tmpfs_mounted)
+ (void) umount(template);
+ (void) rmdir(template);
+ return r;
+}
+
+VolatileMode volatile_mode_from_string(const char *s) {
+ int b;
+
+ if (isempty(s))
+ return _VOLATILE_MODE_INVALID;
+
+ b = parse_boolean(s);
+ if (b > 0)
+ return VOLATILE_YES;
+ if (b == 0)
+ return VOLATILE_NO;
+
+ if (streq(s, "state"))
+ return VOLATILE_STATE;
+
+ return _VOLATILE_MODE_INVALID;
+}
--- /dev/null
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+#pragma once
+
+/***
+ This file is part of systemd.
+
+ Copyright 2015 Lennart Poettering
+
+ systemd 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.
+
+ systemd 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 systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <stdbool.h>
+
+typedef enum VolatileMode {
+ VOLATILE_NO,
+ VOLATILE_YES,
+ VOLATILE_STATE,
+ _VOLATILE_MODE_MAX,
+ _VOLATILE_MODE_INVALID = -1
+} VolatileMode;
+
+typedef enum CustomMountType {
+ CUSTOM_MOUNT_BIND,
+ CUSTOM_MOUNT_TMPFS,
+ CUSTOM_MOUNT_OVERLAY,
+ _CUSTOM_MOUNT_TYPE_MAX,
+ _CUSTOM_MOUNT_TYPE_INVALID = -1
+} CustomMountType;
+
+typedef struct CustomMount {
+ CustomMountType type;
+ bool read_only;
+ char *source; /* for overlayfs this is the upper directory */
+ char *destination;
+ char *options;
+ char *work_dir;
+ char **lower;
+} CustomMount;
+
+CustomMount* custom_mount_add(CustomMount **l, unsigned *n, CustomMountType t);
+
+void custom_mount_free_all(CustomMount *l, unsigned n);
+int bind_mount_parse(CustomMount **l, unsigned *n, const char *s, bool read_only);
+int tmpfs_mount_parse(CustomMount **l, unsigned *n, const char *s);
+
+int custom_mount_compare(const void *a, const void *b);
+
+int mount_all(const char *dest, bool userns, uid_t uid_shift, uid_t uid_range, const char *selinux_apifs_context);
+
+int mount_cgroups(const char *dest, bool unified_requested, bool userns, uid_t uid_shift, uid_t uid_range, const char *selinux_apifs_context);
+int mount_systemd_cgroup_writable(const char *dest, bool unified_requested);
+
+int mount_custom(const char *dest, CustomMount *mounts, unsigned n, bool userns, uid_t uid_shift, uid_t uid_range, const char *selinux_apifs_context);
+
+int setup_volatile(const char *directory, VolatileMode mode, bool userns, uid_t uid_shift, uid_t uid_range, const char *selinux_apifs_context);
+int setup_volatile_state(const char *directory, VolatileMode mode, bool userns, uid_t uid_shift, uid_t uid_range, const char *selinux_apifs_context);
+
+VolatileMode volatile_mode_from_string(const char *s);
#include "macro.h"
#include "nspawn.h"
+#include "nspawn-mount.h"
typedef enum SettingsMask {
SETTING_BOOT = 1 << 0,
#include "nspawn.h"
#include "nspawn-settings.h"
+#include "nspawn-mount.h"
typedef enum ContainerStatus {
CONTAINER_TERMINATED,
, program_invocation_short_name);
}
-static CustomMount* custom_mount_add(CustomMount **l, unsigned *n, CustomMountType t) {
- CustomMount *c, *ret;
-
- assert(l);
- assert(n);
- assert(t >= 0);
- assert(t < _CUSTOM_MOUNT_TYPE_MAX);
-
- c = realloc(*l, (*n + 1) * sizeof(CustomMount));
- if (!c)
- return NULL;
-
- *l = c;
- ret = *l + *n;
- (*n)++;
-
- *ret = (CustomMount) { .type = t };
-
- return ret;
-}
-
-void custom_mount_free_all(CustomMount *l, unsigned n) {
- unsigned i;
-
- for (i = 0; i < n; i++) {
- CustomMount *m = l + i;
-
- free(m->source);
- free(m->destination);
- free(m->options);
-
- if (m->work_dir) {
- (void) rm_rf(m->work_dir, REMOVE_ROOT|REMOVE_PHYSICAL);
- free(m->work_dir);
- }
-
- strv_free(m->lower);
- }
-
- free(l);
-}
-
-static int custom_mount_compare(const void *a, const void *b) {
- const CustomMount *x = a, *y = b;
- int r;
-
- r = path_compare(x->destination, y->destination);
- if (r != 0)
- return r;
-
- if (x->type < y->type)
- return -1;
- if (x->type > y->type)
- return 1;
-
- return 0;
-}
static int custom_mounts_prepare(void) {
unsigned i;
return 0;
}
-VolatileMode volatile_mode_from_string(const char *s) {
- int b;
-
- if (isempty(s))
- return _VOLATILE_MODE_INVALID;
-
- b = parse_boolean(s);
- if (b > 0)
- return VOLATILE_YES;
- if (b == 0)
- return VOLATILE_NO;
-
- if (streq(s, "state"))
- return VOLATILE_STATE;
-
- return _VOLATILE_MODE_INVALID;
-}
-
int expose_port_parse(ExposePort **l, const char *s) {
const char *split, *e;
return 0;
}
-int bind_mount_parse(CustomMount **l, unsigned *n, const char *s, bool read_only) {
- _cleanup_free_ char *source = NULL, *destination = NULL, *opts = NULL;
- const char *p = s;
- CustomMount *m;
- int r;
-
- assert(l);
- assert(n);
-
- r = extract_many_words(&p, ":", EXTRACT_DONT_COALESCE_SEPARATORS, &source, &destination, NULL);
- if (r < 0)
- return r;
- if (r == 0)
- return -EINVAL;
-
- if (r == 1) {
- destination = strdup(source);
- if (!destination)
- return -ENOMEM;
- }
-
- if (r == 2 && !isempty(p)) {
- opts = strdup(p);
- if (!opts)
- return -ENOMEM;
- }
-
- if (!path_is_absolute(source))
- return -EINVAL;
-
- if (!path_is_absolute(destination))
- return -EINVAL;
-
- m = custom_mount_add(l, n, CUSTOM_MOUNT_BIND);
- if (!m)
- return log_oom();
-
- m->source = source;
- m->destination = destination;
- m->read_only = read_only;
- m->options = opts;
-
- source = destination = opts = NULL;
- return 0;
-}
-
-int tmpfs_mount_parse(CustomMount **l, unsigned *n, const char *s) {
- _cleanup_free_ char *path = NULL, *opts = NULL;
- const char *p = s;
- CustomMount *m;
- int r;
-
- assert(l);
- assert(n);
- assert(s);
-
- r = extract_first_word(&p, &path, ":", EXTRACT_DONT_COALESCE_SEPARATORS);
- if (r < 0)
- return r;
- if (r == 0)
- return -EINVAL;
-
- if (isempty(p))
- opts = strdup("mode=0755");
- else
- opts = strdup(p);
- if (!opts)
- return -ENOMEM;
-
- if (!path_is_absolute(path))
- return -EINVAL;
-
- m = custom_mount_add(l, n, CUSTOM_MOUNT_TMPFS);
- if (!m)
- return -ENOMEM;
-
- m->destination = path;
- m->options = opts;
-
- path = opts = NULL;
- return 0;
-}
-
static int parse_argv(int argc, char *argv[]) {
enum {
return 0;
}
-static int tmpfs_patch_options(const char *options, char **ret) {
- char *buf = NULL;
-
- if (arg_userns && arg_uid_shift != 0) {
- assert(arg_uid_shift != UID_INVALID);
-
- if (options)
- (void) asprintf(&buf, "%s,uid=" UID_FMT ",gid=" UID_FMT, options, arg_uid_shift, arg_uid_shift);
- else
- (void) asprintf(&buf, "uid=" UID_FMT ",gid=" UID_FMT, arg_uid_shift, arg_uid_shift);
- if (!buf)
- return -ENOMEM;
-
- options = buf;
- }
-
-#ifdef HAVE_SELINUX
- if (arg_selinux_apifs_context) {
- char *t;
-
- if (options)
- t = strjoin(options, ",context=\"", arg_selinux_apifs_context, "\"", NULL);
- else
- t = strjoin("context=\"", arg_selinux_apifs_context, "\"", NULL);
- if (!t) {
- free(buf);
- return -ENOMEM;
- }
-
- free(buf);
- buf = t;
- }
-#endif
-
- *ret = buf;
- return !!buf;
-}
-
-static int mount_all(const char *dest, bool userns) {
-
- typedef struct MountPoint {
- const char *what;
- const char *where;
- const char *type;
- const char *options;
- unsigned long flags;
- bool fatal;
- bool userns;
- } MountPoint;
-
- static const MountPoint mount_table[] = {
- { "proc", "/proc", "proc", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV, true, true },
- { "/proc/sys", "/proc/sys", NULL, NULL, MS_BIND, true, true }, /* Bind mount first */
- { NULL, "/proc/sys", NULL, NULL, MS_BIND|MS_RDONLY|MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_REMOUNT, true, true }, /* Then, make it r/o */
- { "sysfs", "/sys", "sysfs", NULL, MS_RDONLY|MS_NOSUID|MS_NOEXEC|MS_NODEV, true, false },
- { "tmpfs", "/dev", "tmpfs", "mode=755", MS_NOSUID|MS_STRICTATIME, true, false },
- { "tmpfs", "/dev/shm", "tmpfs", "mode=1777", MS_NOSUID|MS_NODEV|MS_STRICTATIME, true, false },
- { "tmpfs", "/run", "tmpfs", "mode=755", MS_NOSUID|MS_NODEV|MS_STRICTATIME, true, false },
- { "tmpfs", "/tmp", "tmpfs", "mode=1777", MS_STRICTATIME, true, false },
-#ifdef HAVE_SELINUX
- { "/sys/fs/selinux", "/sys/fs/selinux", NULL, NULL, MS_BIND, false, false }, /* Bind mount first */
- { NULL, "/sys/fs/selinux", NULL, NULL, MS_BIND|MS_RDONLY|MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_REMOUNT, false, false }, /* Then, make it r/o */
-#endif
- };
-
- unsigned k;
- int r;
-
- for (k = 0; k < ELEMENTSOF(mount_table); k++) {
- _cleanup_free_ char *where = NULL, *options = NULL;
- const char *o;
-
- if (userns != mount_table[k].userns)
- continue;
-
- where = prefix_root(dest, mount_table[k].where);
- if (!where)
- return log_oom();
-
- r = path_is_mount_point(where, AT_SYMLINK_FOLLOW);
- if (r < 0 && r != -ENOENT)
- return log_error_errno(r, "Failed to detect whether %s is a mount point: %m", where);
-
- /* Skip this entry if it is not a remount. */
- if (mount_table[k].what && r > 0)
- continue;
-
- r = mkdir_p(where, 0755);
- if (r < 0) {
- if (mount_table[k].fatal)
- return log_error_errno(r, "Failed to create directory %s: %m", where);
-
- log_warning_errno(r, "Failed to create directory %s: %m", where);
- continue;
- }
-
- o = mount_table[k].options;
- if (streq_ptr(mount_table[k].type, "tmpfs")) {
- r = tmpfs_patch_options(o, &options);
- if (r < 0)
- return log_oom();
- if (r > 0)
- o = options;
- }
-
- if (mount(mount_table[k].what,
- where,
- mount_table[k].type,
- mount_table[k].flags,
- o) < 0) {
-
- if (mount_table[k].fatal)
- return log_error_errno(errno, "mount(%s) failed: %m", where);
-
- log_warning_errno(errno, "mount(%s) failed, ignoring: %m", where);
- }
- }
-
- return 0;
-}
-
-static int parse_mount_bind_options(const char *options, unsigned long *mount_flags, char **mount_opts) {
- const char *p = options;
- unsigned long flags = *mount_flags;
- char *opts = NULL;
-
- assert(options);
-
- for (;;) {
- _cleanup_free_ char *word = NULL;
- int r = extract_first_word(&p, &word, ",", 0);
- if (r < 0)
- return log_error_errno(r, "Failed to extract mount option: %m");
- if (r == 0)
- break;
-
- if (streq(word, "rbind"))
- flags |= MS_REC;
- else if (streq(word, "norbind"))
- flags &= ~MS_REC;
- else {
- log_error("Invalid bind mount option: %s", word);
- return -EINVAL;
- }
- }
-
- *mount_flags = flags;
- /* in the future mount_opts will hold string options for mount(2) */
- *mount_opts = opts;
-
- return 0;
-}
-
-static int mount_bind(const char *dest, CustomMount *m) {
- struct stat source_st, dest_st;
- const char *where;
- unsigned long mount_flags = MS_BIND | MS_REC;
- _cleanup_free_ char *mount_opts = NULL;
- int r;
-
- assert(m);
-
- if (m->options) {
- r = parse_mount_bind_options(m->options, &mount_flags, &mount_opts);
- if (r < 0)
- return r;
- }
-
- if (stat(m->source, &source_st) < 0)
- return log_error_errno(errno, "Failed to stat %s: %m", m->source);
-
- where = prefix_roota(dest, m->destination);
-
- if (stat(where, &dest_st) >= 0) {
- if (S_ISDIR(source_st.st_mode) && !S_ISDIR(dest_st.st_mode)) {
- log_error("Cannot bind mount directory %s on file %s.", m->source, where);
- return -EINVAL;
- }
-
- if (!S_ISDIR(source_st.st_mode) && S_ISDIR(dest_st.st_mode)) {
- log_error("Cannot bind mount file %s on directory %s.", m->source, where);
- return -EINVAL;
- }
-
- } else if (errno == ENOENT) {
- r = mkdir_parents_label(where, 0755);
- if (r < 0)
- return log_error_errno(r, "Failed to make parents of %s: %m", where);
- } else {
- log_error_errno(errno, "Failed to stat %s: %m", where);
- return -errno;
- }
-
- /* Create the mount point. Any non-directory file can be
- * mounted on any non-directory file (regular, fifo, socket,
- * char, block).
- */
- if (S_ISDIR(source_st.st_mode))
- r = mkdir_label(where, 0755);
- else
- r = touch(where);
- if (r < 0 && r != -EEXIST)
- return log_error_errno(r, "Failed to create mount point %s: %m", where);
-
- if (mount(m->source, where, NULL, mount_flags, mount_opts) < 0)
- return log_error_errno(errno, "mount(%s) failed: %m", where);
-
- if (m->read_only) {
- r = bind_remount_recursive(where, true);
- if (r < 0)
- return log_error_errno(r, "Read-only bind mount failed: %m");
- }
-
- return 0;
-}
-
-static int mount_tmpfs(const char *dest, CustomMount *m) {
- const char *where, *options;
- _cleanup_free_ char *buf = NULL;
- int r;
-
- assert(dest);
- assert(m);
-
- where = prefix_roota(dest, m->destination);
-
- r = mkdir_p_label(where, 0755);
- if (r < 0 && r != -EEXIST)
- return log_error_errno(r, "Creating mount point for tmpfs %s failed: %m", where);
-
- r = tmpfs_patch_options(m->options, &buf);
- if (r < 0)
- return log_oom();
- options = r > 0 ? buf : m->options;
-
- if (mount("tmpfs", where, "tmpfs", MS_NODEV|MS_STRICTATIME, options) < 0)
- return log_error_errno(errno, "tmpfs mount to %s failed: %m", where);
-
- return 0;
-}
-
-static char *joined_and_escaped_lower_dirs(char * const *lower) {
- _cleanup_strv_free_ char **sv = NULL;
-
- sv = strv_copy(lower);
- if (!sv)
- return NULL;
-
- strv_reverse(sv);
-
- if (!strv_shell_escape(sv, ",:"))
- return NULL;
-
- return strv_join(sv, ":");
-}
-
-static int mount_overlay(const char *dest, CustomMount *m) {
- _cleanup_free_ char *lower = NULL;
- const char *where, *options;
- int r;
-
- assert(dest);
- assert(m);
-
- where = prefix_roota(dest, m->destination);
-
- r = mkdir_label(where, 0755);
- if (r < 0 && r != -EEXIST)
- return log_error_errno(r, "Creating mount point for overlay %s failed: %m", where);
-
- (void) mkdir_p_label(m->source, 0755);
-
- lower = joined_and_escaped_lower_dirs(m->lower);
- if (!lower)
- return log_oom();
-
- if (m->read_only) {
- _cleanup_free_ char *escaped_source = NULL;
-
- escaped_source = shell_escape(m->source, ",:");
- if (!escaped_source)
- return log_oom();
-
- options = strjoina("lowerdir=", escaped_source, ":", lower);
- } else {
- _cleanup_free_ char *escaped_source = NULL, *escaped_work_dir = NULL;
-
- assert(m->work_dir);
- (void) mkdir_label(m->work_dir, 0700);
-
- escaped_source = shell_escape(m->source, ",:");
- if (!escaped_source)
- return log_oom();
- escaped_work_dir = shell_escape(m->work_dir, ",:");
- if (!escaped_work_dir)
- return log_oom();
-
- options = strjoina("lowerdir=", lower, ",upperdir=", escaped_source, ",workdir=", escaped_work_dir);
- }
-
- if (mount("overlay", where, "overlay", m->read_only ? MS_RDONLY : 0, options) < 0)
- return log_error_errno(errno, "overlay mount to %s failed: %m", where);
-
- return 0;
-}
-
-static int mount_custom(const char *dest) {
- unsigned i;
- int r;
-
- assert(dest);
-
- for (i = 0; i < arg_n_custom_mounts; i++) {
- CustomMount *m = &arg_custom_mounts[i];
-
- switch (m->type) {
-
- case CUSTOM_MOUNT_BIND:
- r = mount_bind(dest, m);
- break;
-
- case CUSTOM_MOUNT_TMPFS:
- r = mount_tmpfs(dest, m);
- break;
-
- case CUSTOM_MOUNT_OVERLAY:
- r = mount_overlay(dest, m);
- break;
-
- default:
- assert_not_reached("Unknown custom mount type");
- }
-
- if (r < 0)
- return r;
- }
-
- return 0;
-}
-
-static int mount_legacy_cgroup_hierarchy(const char *dest, const char *controller, const char *hierarchy, bool read_only) {
- char *to;
- int r;
-
- to = strjoina(dest, "/sys/fs/cgroup/", hierarchy);
-
- r = path_is_mount_point(to, 0);
- if (r < 0 && r != -ENOENT)
- return log_error_errno(r, "Failed to determine if %s is mounted already: %m", to);
- if (r > 0)
- return 0;
-
- mkdir_p(to, 0755);
-
- /* The superblock mount options of the mount point need to be
- * identical to the hosts', and hence writable... */
- if (mount("cgroup", to, "cgroup", MS_NOSUID|MS_NOEXEC|MS_NODEV, controller) < 0)
- return log_error_errno(errno, "Failed to mount to %s: %m", to);
-
- /* ... hence let's only make the bind mount read-only, not the
- * superblock. */
- if (read_only) {
- if (mount(NULL, to, NULL, MS_BIND|MS_REMOUNT|MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_RDONLY, NULL) < 0)
- return log_error_errno(errno, "Failed to remount %s read-only: %m", to);
- }
- return 1;
-}
-
-static int mount_legacy_cgroups(const char *dest) {
- _cleanup_set_free_free_ Set *controllers = NULL;
- const char *cgroup_root;
- int r;
-
- cgroup_root = prefix_roota(dest, "/sys/fs/cgroup");
-
- /* Mount a tmpfs to /sys/fs/cgroup if it's not mounted there yet. */
- r = path_is_mount_point(cgroup_root, AT_SYMLINK_FOLLOW);
- if (r < 0)
- return log_error_errno(r, "Failed to determine if /sys/fs/cgroup is already mounted: %m");
- if (r == 0) {
- _cleanup_free_ char *options = NULL;
-
- r = tmpfs_patch_options("mode=755", &options);
- if (r < 0)
- return log_oom();
-
- if (mount("tmpfs", cgroup_root, "tmpfs", MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_STRICTATIME, options) < 0)
- return log_error_errno(errno, "Failed to mount /sys/fs/cgroup: %m");
- }
-
- if (cg_unified() > 0)
- goto skip_controllers;
-
- controllers = set_new(&string_hash_ops);
- if (!controllers)
- return log_oom();
-
- r = cg_kernel_controllers(controllers);
- if (r < 0)
- return log_error_errno(r, "Failed to determine cgroup controllers: %m");
-
- for (;;) {
- _cleanup_free_ char *controller = NULL, *origin = NULL, *combined = NULL;
-
- controller = set_steal_first(controllers);
- if (!controller)
- break;
-
- origin = prefix_root("/sys/fs/cgroup/", controller);
- if (!origin)
- return log_oom();
-
- r = readlink_malloc(origin, &combined);
- if (r == -EINVAL) {
- /* Not a symbolic link, but directly a single cgroup hierarchy */
-
- r = mount_legacy_cgroup_hierarchy(dest, controller, controller, true);
- if (r < 0)
- return r;
-
- } else if (r < 0)
- return log_error_errno(r, "Failed to read link %s: %m", origin);
- else {
- _cleanup_free_ char *target = NULL;
-
- target = prefix_root(dest, origin);
- if (!target)
- return log_oom();
-
- /* A symbolic link, a combination of controllers in one hierarchy */
-
- if (!filename_is_valid(combined)) {
- log_warning("Ignoring invalid combined hierarchy %s.", combined);
- continue;
- }
-
- r = mount_legacy_cgroup_hierarchy(dest, combined, combined, true);
- if (r < 0)
- return r;
-
- r = symlink_idempotent(combined, target);
- if (r == -EINVAL) {
- log_error("Invalid existing symlink for combined hierarchy");
- return r;
- }
- if (r < 0)
- return log_error_errno(r, "Failed to create symlink for combined hierarchy: %m");
- }
- }
-
-skip_controllers:
- r = mount_legacy_cgroup_hierarchy(dest, "none,name=systemd,xattr", "systemd", false);
- if (r < 0)
- return r;
-
- if (mount(NULL, cgroup_root, NULL, MS_REMOUNT|MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_STRICTATIME|MS_RDONLY, "mode=755") < 0)
- return log_error_errno(errno, "Failed to remount %s read-only: %m", cgroup_root);
-
- return 0;
-}
-
-static int mount_unified_cgroups(const char *dest) {
- const char *p;
- int r;
-
- assert(dest);
-
- p = strjoina(dest, "/sys/fs/cgroup");
-
- r = path_is_mount_point(p, AT_SYMLINK_FOLLOW);
- if (r < 0)
- return log_error_errno(r, "Failed to determine if %s is mounted already: %m", p);
- if (r > 0) {
- p = strjoina(dest, "/sys/fs/cgroup/cgroup.procs");
- if (access(p, F_OK) >= 0)
- return 0;
- if (errno != ENOENT)
- return log_error_errno(errno, "Failed to determine if mount point %s contains the unified cgroup hierarchy: %m", p);
-
- log_error("%s is already mounted but not a unified cgroup hierarchy. Refusing.", p);
- return -EINVAL;
- }
-
- if (mount("cgroup", p, "cgroup", MS_NOSUID|MS_NOEXEC|MS_NODEV, "__DEVEL__sane_behavior") < 0)
- return log_error_errno(errno, "Failed to mount unified cgroup hierarchy to %s: %m", p);
-
- return 0;
-}
-
-static int mount_cgroups(const char *dest) {
- if (arg_unified_cgroup_hierarchy)
- return mount_unified_cgroups(dest);
- else
- return mount_legacy_cgroups(dest);
-}
-
-static int mount_systemd_cgroup_writable(const char *dest) {
- _cleanup_free_ char *own_cgroup_path = NULL;
- const char *systemd_root, *systemd_own;
- int r;
-
- assert(dest);
-
- r = cg_pid_get_path(NULL, 0, &own_cgroup_path);
- if (r < 0)
- return log_error_errno(r, "Failed to determine our own cgroup path: %m");
-
- /* If we are living in the top-level, then there's nothing to do... */
- if (path_equal(own_cgroup_path, "/"))
- return 0;
-
- if (arg_unified_cgroup_hierarchy) {
- systemd_own = strjoina(dest, "/sys/fs/cgroup", own_cgroup_path);
- systemd_root = prefix_roota(dest, "/sys/fs/cgroup");
- } else {
- systemd_own = strjoina(dest, "/sys/fs/cgroup/systemd", own_cgroup_path);
- systemd_root = prefix_roota(dest, "/sys/fs/cgroup/systemd");
- }
-
- /* Make our own cgroup a (writable) bind mount */
- if (mount(systemd_own, systemd_own, NULL, MS_BIND, NULL) < 0)
- return log_error_errno(errno, "Failed to turn %s into a bind mount: %m", own_cgroup_path);
-
- /* And then remount the systemd cgroup root read-only */
- if (mount(NULL, systemd_root, NULL, MS_BIND|MS_REMOUNT|MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_RDONLY, NULL) < 0)
- return log_error_errno(errno, "Failed to mount cgroup root read-only: %m");
-
- return 0;
-}
-
static int userns_lchown(const char *p, uid_t uid, gid_t gid) {
assert(p);
return 0;
}
-static int setup_volatile_state(const char *directory) {
- _cleanup_free_ char *buf = NULL;
- const char *p, *options;
- int r;
-
- assert(directory);
-
- if (arg_volatile_mode != VOLATILE_STATE)
- return 0;
-
- /* --volatile=state means we simply overmount /var
- with a tmpfs, and the rest read-only. */
-
- r = bind_remount_recursive(directory, true);
- if (r < 0)
- return log_error_errno(r, "Failed to remount %s read-only: %m", directory);
-
- p = prefix_roota(directory, "/var");
- r = mkdir(p, 0755);
- if (r < 0 && errno != EEXIST)
- return log_error_errno(errno, "Failed to create %s: %m", directory);
-
- options = "mode=755";
- r = tmpfs_patch_options(options, &buf);
- if (r < 0)
- return log_oom();
- if (r > 0)
- options = buf;
-
- if (mount("tmpfs", p, "tmpfs", MS_STRICTATIME, options) < 0)
- return log_error_errno(errno, "Failed to mount tmpfs to /var: %m");
-
- return 0;
-}
-
-static int setup_volatile(const char *directory) {
- bool tmpfs_mounted = false, bind_mounted = false;
- char template[] = "/tmp/nspawn-volatile-XXXXXX";
- _cleanup_free_ char *buf = NULL;
- const char *f, *t, *options;
- int r;
-
- assert(directory);
-
- if (arg_volatile_mode != VOLATILE_YES)
- return 0;
-
- /* --volatile=yes means we mount a tmpfs to the root dir, and
- the original /usr to use inside it, and that read-only. */
-
- if (!mkdtemp(template))
- return log_error_errno(errno, "Failed to create temporary directory: %m");
-
- options = "mode=755";
- r = tmpfs_patch_options(options, &buf);
- if (r < 0)
- return log_oom();
- if (r > 0)
- options = buf;
-
- if (mount("tmpfs", template, "tmpfs", MS_STRICTATIME, options) < 0) {
- r = log_error_errno(errno, "Failed to mount tmpfs for root directory: %m");
- goto fail;
- }
-
- tmpfs_mounted = true;
-
- f = prefix_roota(directory, "/usr");
- t = prefix_roota(template, "/usr");
-
- r = mkdir(t, 0755);
- if (r < 0 && errno != EEXIST) {
- r = log_error_errno(errno, "Failed to create %s: %m", t);
- goto fail;
- }
-
- if (mount(f, t, NULL, MS_BIND|MS_REC, NULL) < 0) {
- r = log_error_errno(errno, "Failed to create /usr bind mount: %m");
- goto fail;
- }
-
- bind_mounted = true;
-
- r = bind_remount_recursive(t, true);
- if (r < 0) {
- log_error_errno(r, "Failed to remount %s read-only: %m", t);
- goto fail;
- }
-
- if (mount(template, directory, NULL, MS_MOVE, NULL) < 0) {
- r = log_error_errno(errno, "Failed to move root mount: %m");
- goto fail;
- }
-
- (void) rmdir(template);
-
- return 0;
-
-fail:
- if (bind_mounted)
- (void) umount(t);
-
- if (tmpfs_mounted)
- (void) umount(template);
- (void) rmdir(template);
- return r;
-}
-
static char* id128_format_as_uuid(sd_id128_t id, char s[37]) {
assert(s);
}
}
- r = mount_all(NULL, true);
+ r = mount_all(NULL, true, arg_uid_shift, arg_uid_range, arg_selinux_apifs_context);
if (r < 0)
return r;
return -ESRCH;
}
- r = mount_systemd_cgroup_writable("");
+ r = mount_systemd_cgroup_writable("", arg_unified_cgroup_hierarchy);
if (r < 0)
return r;
if (mount(directory, directory, NULL, MS_BIND|MS_REC, NULL) < 0)
return log_error_errno(errno, "Failed to make bind mount: %m");
- r = setup_volatile(directory);
+ r = setup_volatile(directory, arg_volatile_mode, arg_userns, arg_uid_shift, arg_uid_range, arg_selinux_context);
if (r < 0)
return r;
- r = setup_volatile_state(directory);
+ r = setup_volatile_state(directory, arg_volatile_mode, arg_userns, arg_uid_shift, arg_uid_range, arg_selinux_context);
if (r < 0)
return r;
return log_error_errno(r, "Failed to make tree read-only: %m");
}
- r = mount_all(directory, false);
+ r = mount_all(directory, false, arg_uid_shift, arg_uid_range, arg_selinux_apifs_context);
if (r < 0)
return r;
if (r < 0)
return r;
- r = mount_custom(directory);
+ r = mount_custom(directory, arg_custom_mounts, arg_n_custom_mounts, arg_userns, arg_uid_shift, arg_uid_range, arg_selinux_apifs_context);
if (r < 0)
return r;
- r = mount_cgroups(directory);
+ r = mount_cgroups(directory, arg_unified_cgroup_hierarchy, arg_userns, arg_uid_shift, arg_uid_range, arg_selinux_apifs_context);
if (r < 0)
return r;
#include "list.h"
-typedef enum VolatileMode {
- VOLATILE_NO,
- VOLATILE_YES,
- VOLATILE_STATE,
- _VOLATILE_MODE_MAX,
- _VOLATILE_MODE_INVALID = -1
-} VolatileMode;
-
-typedef enum CustomMountType {
- CUSTOM_MOUNT_BIND,
- CUSTOM_MOUNT_TMPFS,
- CUSTOM_MOUNT_OVERLAY,
- _CUSTOM_MOUNT_TYPE_MAX,
- _CUSTOM_MOUNT_TYPE_INVALID = -1
-} CustomMountType;
-
-typedef struct CustomMount {
- CustomMountType type;
- bool read_only;
- char *source; /* for overlayfs this is the upper directory */
- char *destination;
- char *options;
- char *work_dir;
- char **lower;
-} CustomMount;
-
typedef struct ExposePort {
int protocol;
uint16_t host_port;
LIST_FIELDS(struct ExposePort, ports);
} ExposePort;
-void custom_mount_free_all(CustomMount *l, unsigned n);
-int bind_mount_parse(CustomMount **l, unsigned *n, const char *s, bool read_only);
-int tmpfs_mount_parse(CustomMount **l, unsigned *n, const char *s);
-
void expose_port_free_all(ExposePort *p);
int expose_port_parse(ExposePort **l, const char *s);
-
-VolatileMode volatile_mode_from_string(const char *s);
projects / thirdparty / systemd.git / commitdiff
