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Diffstat (limited to 'src/nspawn/nspawn-mount.c')
-rw-r--r--src/nspawn/nspawn-mount.c450
1 files changed, 334 insertions, 116 deletions
diff --git a/src/nspawn/nspawn-mount.c b/src/nspawn/nspawn-mount.c
index 85e2c943e3..115de64cf9 100644
--- a/src/nspawn/nspawn-mount.c
+++ b/src/nspawn/nspawn-mount.c
@@ -21,8 +21,9 @@
#include <linux/magic.h>
#include "alloc-util.h"
-#include "cgroup-util.h"
#include "escape.h"
+#include "fd-util.h"
+#include "fileio.h"
#include "fs-util.h"
#include "label.h"
#include "mkdir.h"
@@ -181,13 +182,15 @@ int tmpfs_mount_parse(CustomMount **l, unsigned *n, const char *s) {
static int tmpfs_patch_options(
const char *options,
- bool userns, uid_t uid_shift, uid_t uid_range,
+ bool userns,
+ uid_t uid_shift, uid_t uid_range,
+ bool patch_ids,
const char *selinux_apifs_context,
char **ret) {
char *buf = NULL;
- if (userns && uid_shift != 0) {
+ if ((userns && uid_shift != 0) || patch_ids) {
assert(uid_shift != UID_INVALID);
if (options)
@@ -218,7 +221,13 @@ static int tmpfs_patch_options(
}
#endif
+ if (!buf && options) {
+ buf = strdup(options);
+ if (!buf)
+ return -ENOMEM;
+ }
*ret = buf;
+
return !!buf;
}
@@ -241,8 +250,10 @@ int mount_sysfs(const char *dest) {
(void) mkdir(full, 0755);
- if (mount("sysfs", full, "sysfs", MS_RDONLY|MS_NOSUID|MS_NOEXEC|MS_NODEV, NULL) < 0)
- return log_error_errno(errno, "Failed to mount sysfs to %s: %m", full);
+ r = mount_verbose(LOG_ERR, "sysfs", full, "sysfs",
+ MS_RDONLY|MS_NOSUID|MS_NOEXEC|MS_NODEV, NULL);
+ if (r < 0)
+ return r;
FOREACH_STRING(x, "block", "bus", "class", "dev", "devices", "kernel") {
_cleanup_free_ char *from = NULL, *to = NULL;
@@ -257,28 +268,91 @@ int mount_sysfs(const char *dest) {
(void) mkdir(to, 0755);
- if (mount(from, to, NULL, MS_BIND, NULL) < 0)
- return log_error_errno(errno, "Failed to mount /sys/%s into place: %m", x);
+ r = mount_verbose(LOG_ERR, from, to, NULL, MS_BIND, NULL);
+ if (r < 0)
+ return r;
- if (mount(NULL, to, NULL, MS_BIND|MS_RDONLY|MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_REMOUNT, NULL) < 0)
- return log_error_errno(errno, "Failed to mount /sys/%s read-only: %m", x);
+ r = mount_verbose(LOG_ERR, NULL, to, NULL,
+ MS_BIND|MS_RDONLY|MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_REMOUNT, NULL);
+ if (r < 0)
+ return r;
}
- if (umount(full) < 0)
- return log_error_errno(errno, "Failed to unmount %s: %m", full);
+ r = umount_verbose(full);
+ if (r < 0)
+ return r;
if (rmdir(full) < 0)
return log_error_errno(errno, "Failed to remove %s: %m", full);
x = prefix_roota(top, "/fs/kdbus");
- (void) mkdir(x, 0755);
+ (void) mkdir_p(x, 0755);
+
+ /* Create mountpoint for cgroups. Otherwise we are not allowed since we
+ * remount /sys read-only.
+ */
+ if (cg_ns_supported()) {
+ x = prefix_roota(top, "/fs/cgroup");
+ (void) mkdir_p(x, 0755);
+ }
+
+ return mount_verbose(LOG_ERR, NULL, top, NULL,
+ MS_BIND|MS_RDONLY|MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_REMOUNT, NULL);
+}
+
+static int mkdir_userns(const char *path, mode_t mode, bool in_userns, uid_t uid_shift) {
+ int r;
+
+ assert(path);
- if (mount(NULL, top, NULL, MS_BIND|MS_RDONLY|MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_REMOUNT, NULL) < 0)
- return log_error_errno(errno, "Failed to make %s read-only: %m", top);
+ r = mkdir(path, mode);
+ if (r < 0 && errno != EEXIST)
+ return -errno;
+
+ if (!in_userns) {
+ r = lchown(path, uid_shift, uid_shift);
+ if (r < 0)
+ return -errno;
+ }
return 0;
}
+static int mkdir_userns_p(const char *prefix, const char *path, mode_t mode, bool in_userns, uid_t uid_shift) {
+ const char *p, *e;
+ int r;
+
+ assert(path);
+
+ if (prefix && !path_startswith(path, prefix))
+ return -ENOTDIR;
+
+ /* create every parent directory in the path, except the last component */
+ p = path + strspn(path, "/");
+ for (;;) {
+ char t[strlen(path) + 1];
+
+ e = p + strcspn(p, "/");
+ p = e + strspn(e, "/");
+
+ /* Is this the last component? If so, then we're done */
+ if (*p == 0)
+ break;
+
+ memcpy(t, path, e - path);
+ t[e-path] = 0;
+
+ if (prefix && path_startswith(prefix, t))
+ continue;
+
+ r = mkdir_userns(t, mode, in_userns, uid_shift);
+ if (r < 0)
+ return r;
+ }
+
+ return mkdir_userns(path, mode, in_userns, uid_shift);
+}
+
int mount_all(const char *dest,
bool use_userns, bool in_userns,
bool use_netns,
@@ -297,19 +371,21 @@ int mount_all(const char *dest,
} MountPoint;
static const MountPoint mount_table[] = {
- { "proc", "/proc", "proc", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV, true, true, false },
- { "/proc/sys", "/proc/sys", NULL, NULL, MS_BIND, true, true, false }, /* Bind mount first ...*/
- { "/proc/sys/net", "/proc/sys/net", NULL, NULL, MS_BIND, true, true, true }, /* (except for this) */
- { NULL, "/proc/sys", NULL, NULL, MS_BIND|MS_RDONLY|MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_REMOUNT, true, true, false }, /* ... then, make it r/o */
- { "tmpfs", "/sys", "tmpfs", "mode=755", MS_NOSUID|MS_NOEXEC|MS_NODEV, true, false, true },
- { "sysfs", "/sys", "sysfs", NULL, MS_RDONLY|MS_NOSUID|MS_NOEXEC|MS_NODEV, true, false, false },
- { "tmpfs", "/dev", "tmpfs", "mode=755", MS_NOSUID|MS_STRICTATIME, true, false, false },
- { "tmpfs", "/dev/shm", "tmpfs", "mode=1777", MS_NOSUID|MS_NODEV|MS_STRICTATIME, true, false, false },
- { "tmpfs", "/run", "tmpfs", "mode=755", MS_NOSUID|MS_NODEV|MS_STRICTATIME, true, false, false },
- { "tmpfs", "/tmp", "tmpfs", "mode=1777", MS_STRICTATIME, true, false, false },
+ { "proc", "/proc", "proc", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV, true, true, false },
+ { "/proc/sys", "/proc/sys", NULL, NULL, MS_BIND, true, true, false }, /* Bind mount first ...*/
+ { "/proc/sys/net", "/proc/sys/net", NULL, NULL, MS_BIND, true, true, true }, /* (except for this) */
+ { NULL, "/proc/sys", NULL, NULL, MS_BIND|MS_RDONLY|MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_REMOUNT, true, true, false }, /* ... then, make it r/o */
+ { "/proc/sysrq-trigger", "/proc/sysrq-trigger", NULL, NULL, MS_BIND, false, true, false }, /* Bind mount first ...*/
+ { NULL, "/proc/sysrq-trigger", NULL, NULL, MS_BIND|MS_RDONLY|MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_REMOUNT, false, true, false }, /* ... then, make it r/o */
+ { "tmpfs", "/sys", "tmpfs", "mode=755", MS_NOSUID|MS_NOEXEC|MS_NODEV, true, false, true },
+ { "sysfs", "/sys", "sysfs", NULL, MS_RDONLY|MS_NOSUID|MS_NOEXEC|MS_NODEV, true, false, false },
+ { "tmpfs", "/dev", "tmpfs", "mode=755", MS_NOSUID|MS_STRICTATIME, true, false, false },
+ { "tmpfs", "/dev/shm", "tmpfs", "mode=1777", MS_NOSUID|MS_NODEV|MS_STRICTATIME, true, false, false },
+ { "tmpfs", "/run", "tmpfs", "mode=755", MS_NOSUID|MS_NODEV|MS_STRICTATIME, true, false, false },
+ { "tmpfs", "/tmp", "tmpfs", "mode=1777", MS_STRICTATIME, true, true, false },
#ifdef HAVE_SELINUX
- { "/sys/fs/selinux", "/sys/fs/selinux", NULL, NULL, MS_BIND, false, 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, false }, /* Then, make it r/o */
+ { "/sys/fs/selinux", "/sys/fs/selinux", NULL, NULL, MS_BIND, false, 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, false }, /* Then, make it r/o */
#endif
};
@@ -338,8 +414,8 @@ int mount_all(const char *dest,
if (mount_table[k].what && r > 0)
continue;
- r = mkdir_p(where, 0755);
- if (r < 0) {
+ r = mkdir_userns_p(dest, where, 0755, in_userns, uid_shift);
+ if (r < 0 && r != -EEXIST) {
if (mount_table[k].fatal)
return log_error_errno(r, "Failed to create directory %s: %m", where);
@@ -349,24 +425,24 @@ int mount_all(const char *dest,
o = mount_table[k].options;
if (streq_ptr(mount_table[k].type, "tmpfs")) {
- r = tmpfs_patch_options(o, use_userns, uid_shift, uid_range, selinux_apifs_context, &options);
+ if (in_userns)
+ r = tmpfs_patch_options(o, use_userns, 0, uid_range, true, selinux_apifs_context, &options);
+ else
+ r = tmpfs_patch_options(o, use_userns, uid_shift, uid_range, false, 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);
- }
+ r = mount_verbose(mount_table[k].fatal ? LOG_ERR : LOG_WARNING,
+ mount_table[k].what,
+ where,
+ mount_table[k].type,
+ mount_table[k].flags,
+ o);
+ if (r < 0 && mount_table[k].fatal)
+ return r;
}
return 0;
@@ -451,15 +527,15 @@ static int mount_bind(const char *dest, CustomMount *m) {
if (r < 0)
return log_error_errno(r, "Failed to create mount point %s: %m", where);
- } else {
+ } else
return log_error_errno(errno, "Failed to stat %s: %m", where);
- }
- if (mount(m->source, where, NULL, mount_flags, mount_opts) < 0)
- return log_error_errno(errno, "mount(%s) failed: %m", where);
+ r = mount_verbose(LOG_ERR, m->source, where, NULL, mount_flags, mount_opts);
+ if (r < 0)
+ return r;
if (m->read_only) {
- r = bind_remount_recursive(where, true);
+ r = bind_remount_recursive(where, true, NULL);
if (r < 0)
return log_error_errno(r, "Read-only bind mount failed: %m");
}
@@ -486,15 +562,12 @@ static int mount_tmpfs(
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);
+ r = tmpfs_patch_options(m->options, userns, uid_shift, uid_range, false, 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;
+ return mount_verbose(LOG_ERR, "tmpfs", where, "tmpfs", MS_NODEV|MS_STRICTATIME, options);
}
static char *joined_and_escaped_lower_dirs(char * const *lower) {
@@ -556,10 +629,7 @@ static int mount_overlay(const char *dest, CustomMount *m) {
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;
+ return mount_verbose(LOG_ERR, "overlay", where, "overlay", m->read_only ? MS_RDONLY : 0, options);
}
int mount_custom(
@@ -601,8 +671,52 @@ int mount_custom(
return 0;
}
-static int mount_legacy_cgroup_hierarchy(const char *dest, const char *controller, const char *hierarchy, bool read_only) {
- char *to;
+/* Retrieve existing subsystems. This function is called in a new cgroup
+ * namespace.
+ */
+static int get_controllers(Set *subsystems) {
+ _cleanup_fclose_ FILE *f = NULL;
+ char line[LINE_MAX];
+
+ assert(subsystems);
+
+ f = fopen("/proc/self/cgroup", "re");
+ if (!f)
+ return errno == ENOENT ? -ESRCH : -errno;
+
+ FOREACH_LINE(line, f, return -errno) {
+ int r;
+ char *e, *l, *p;
+
+ l = strchr(line, ':');
+ if (!l)
+ continue;
+
+ l++;
+ e = strchr(l, ':');
+ if (!e)
+ continue;
+
+ *e = 0;
+
+ if (STR_IN_SET(l, "", "name=systemd"))
+ continue;
+
+ p = strdup(l);
+ if (!p)
+ return -ENOMEM;
+
+ r = set_consume(subsystems, p);
+ if (r < 0)
+ return r;
+ }
+
+ return 0;
+}
+
+static int mount_legacy_cgroup_hierarchy(const char *dest, const char *controller, const char *hierarchy,
+ CGroupUnified unified_requested, bool read_only) {
+ const char *to, *fstype, *opts;
int r;
to = strjoina(strempty(dest), "/sys/fs/cgroup/", hierarchy);
@@ -617,23 +731,136 @@ static int mount_legacy_cgroup_hierarchy(const char *dest, const char *controlle
/* 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);
+ if (streq(controller, SYSTEMD_CGROUP_CONTROLLER)) {
+ if (unified_requested >= CGROUP_UNIFIED_SYSTEMD) {
+ fstype = "cgroup2";
+ opts = NULL;
+ } else {
+ fstype = "cgroup";
+ opts = "none,name=systemd,xattr";
+ }
+ } else {
+ fstype = "cgroup";
+ opts = controller;
+ }
- /* ... hence let's only make the bind mount read-only, not the
- * superblock. */
+ r = mount_verbose(LOG_ERR, "cgroup", to, fstype, MS_NOSUID|MS_NOEXEC|MS_NODEV, opts);
+ if (r < 0)
+ return r;
+
+ /* ... 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);
+ r = mount_verbose(LOG_ERR, NULL, to, NULL,
+ MS_BIND|MS_REMOUNT|MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_RDONLY, NULL);
+ if (r < 0)
+ return r;
}
+
return 1;
}
-static int mount_legacy_cgroups(
+/* Mount a legacy cgroup hierarchy when cgroup namespaces are supported. */
+static int mount_legacy_cgns_supported(
+ CGroupUnified unified_requested, 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 = "/sys/fs/cgroup", *c;
+ int r;
+
+ (void) mkdir_p(cgroup_root, 0755);
+
+ /* 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;
+
+ /* When cgroup namespaces are enabled and user namespaces are
+ * used then the mount of the cgroupfs is done *inside* the new
+ * user namespace. We're root in the new user namespace and the
+ * kernel will happily translate our uid/gid to the correct
+ * uid/gid as seen from e.g. /proc/1/mountinfo. So we simply
+ * pass uid 0 and not uid_shift to tmpfs_patch_options().
+ */
+ r = tmpfs_patch_options("mode=755", userns, 0, uid_range, true, selinux_apifs_context, &options);
+ if (r < 0)
+ return log_oom();
+
+ r = mount_verbose(LOG_ERR, "tmpfs", cgroup_root, "tmpfs",
+ MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_STRICTATIME, options);
+ if (r < 0)
+ return r;
+ }
+
+ if (cg_all_unified() > 0)
+ goto skip_controllers;
+
+ controllers = set_new(&string_hash_ops);
+ if (!controllers)
+ return log_oom();
+
+ r = get_controllers(controllers);
+ if (r < 0)
+ return log_error_errno(r, "Failed to determine cgroup controllers: %m");
+
+ for (;;) {
+ _cleanup_free_ const char *controller = NULL;
+
+ controller = set_steal_first(controllers);
+ if (!controller)
+ break;
+
+ r = mount_legacy_cgroup_hierarchy("", controller, controller, unified_requested, !userns);
+ if (r < 0)
+ return r;
+
+ /* When multiple hierarchies are co-mounted, make their
+ * constituting individual hierarchies a symlink to the
+ * co-mount.
+ */
+ c = controller;
+ for (;;) {
+ _cleanup_free_ char *target = NULL, *tok = NULL;
+
+ r = extract_first_word(&c, &tok, ",", 0);
+ if (r < 0)
+ return log_error_errno(r, "Failed to extract co-mounted cgroup controller: %m");
+ if (r == 0)
+ break;
+
+ target = prefix_root("/sys/fs/cgroup", tok);
+ if (!target)
+ return log_oom();
+
+ if (streq(controller, tok))
+ break;
+
+ r = symlink_idempotent(controller, target);
+ if (r == -EINVAL)
+ return log_error_errno(r, "Invalid existing symlink for combined hierarchy: %m");
+ if (r < 0)
+ return log_error_errno(r, "Failed to create symlink for combined hierarchy: %m");
+ }
+ }
+
+skip_controllers:
+ r = mount_legacy_cgroup_hierarchy("", SYSTEMD_CGROUP_CONTROLLER, "systemd", unified_requested, false);
+ if (r < 0)
+ return r;
+
+ if (!userns)
+ return mount_verbose(LOG_ERR, NULL, cgroup_root, NULL,
+ MS_REMOUNT|MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_STRICTATIME|MS_RDONLY, "mode=755");
+
+ return 0;
+}
+
+/* Mount legacy cgroup hierarchy when cgroup namespaces are unsupported. */
+static int mount_legacy_cgns_unsupported(
const char *dest,
- bool userns, uid_t uid_shift, uid_t uid_range,
+ CGroupUnified unified_requested, 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;
@@ -649,15 +876,17 @@ static int mount_legacy_cgroups(
if (r == 0) {
_cleanup_free_ char *options = NULL;
- r = tmpfs_patch_options("mode=755", userns, uid_shift, uid_range, selinux_apifs_context, &options);
+ r = tmpfs_patch_options("mode=755", userns, uid_shift, uid_range, false, 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");
+ r = mount_verbose(LOG_ERR, "tmpfs", cgroup_root, "tmpfs",
+ MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_STRICTATIME, options);
+ if (r < 0)
+ return r;
}
- if (cg_unified() > 0)
+ if (cg_all_unified() > 0)
goto skip_controllers;
controllers = set_new(&string_hash_ops);
@@ -683,7 +912,7 @@ static int mount_legacy_cgroups(
if (r == -EINVAL) {
/* Not a symbolic link, but directly a single cgroup hierarchy */
- r = mount_legacy_cgroup_hierarchy(dest, controller, controller, true);
+ r = mount_legacy_cgroup_hierarchy(dest, controller, controller, unified_requested, true);
if (r < 0)
return r;
@@ -703,29 +932,25 @@ static int mount_legacy_cgroups(
continue;
}
- r = mount_legacy_cgroup_hierarchy(dest, combined, combined, true);
+ r = mount_legacy_cgroup_hierarchy(dest, combined, combined, unified_requested, 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 == -EINVAL)
+ return log_error_errno(r, "Invalid existing symlink for combined hierarchy: %m");
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);
+ r = mount_legacy_cgroup_hierarchy(dest, SYSTEMD_CGROUP_CONTROLLER, "systemd", unified_requested, 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;
+ return mount_verbose(LOG_ERR, NULL, cgroup_root, NULL,
+ MS_REMOUNT|MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_STRICTATIME|MS_RDONLY, "mode=755");
}
static int mount_unified_cgroups(const char *dest) {
@@ -752,27 +977,27 @@ static int mount_unified_cgroups(const char *dest) {
return -EINVAL;
}
- if (mount("cgroup", p, "cgroup2", MS_NOSUID|MS_NOEXEC|MS_NODEV, NULL) < 0)
- return log_error_errno(errno, "Failed to mount unified cgroup hierarchy to %s: %m", p);
-
- return 0;
+ return mount_verbose(LOG_ERR, "cgroup", p, "cgroup2", MS_NOSUID|MS_NOEXEC|MS_NODEV, NULL);
}
int mount_cgroups(
const char *dest,
- bool unified_requested,
+ CGroupUnified unified_requested,
bool userns, uid_t uid_shift, uid_t uid_range,
- const char *selinux_apifs_context) {
+ const char *selinux_apifs_context,
+ bool use_cgns) {
- if (unified_requested)
+ if (unified_requested >= CGROUP_UNIFIED_ALL)
return mount_unified_cgroups(dest);
- else
- return mount_legacy_cgroups(dest, userns, uid_shift, uid_range, selinux_apifs_context);
+ else if (use_cgns)
+ return mount_legacy_cgns_supported(unified_requested, userns, uid_shift, uid_range, selinux_apifs_context);
+
+ return mount_legacy_cgns_unsupported(dest, unified_requested, userns, uid_shift, uid_range, selinux_apifs_context);
}
int mount_systemd_cgroup_writable(
const char *dest,
- bool unified_requested) {
+ CGroupUnified unified_requested) {
_cleanup_free_ char *own_cgroup_path = NULL;
const char *systemd_root, *systemd_own;
@@ -788,7 +1013,7 @@ int mount_systemd_cgroup_writable(
if (path_equal(own_cgroup_path, "/"))
return 0;
- if (unified_requested) {
+ if (unified_requested >= CGROUP_UNIFIED_ALL) {
systemd_own = strjoina(dest, "/sys/fs/cgroup", own_cgroup_path);
systemd_root = prefix_roota(dest, "/sys/fs/cgroup");
} else {
@@ -797,14 +1022,13 @@ int mount_systemd_cgroup_writable(
}
/* 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);
+ r = mount_verbose(LOG_ERR, systemd_own, systemd_own, NULL, MS_BIND, NULL);
+ if (r < 0)
+ return r;
/* 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;
+ return mount_verbose(LOG_ERR, NULL, systemd_root, NULL,
+ MS_BIND|MS_REMOUNT|MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_RDONLY, NULL);
}
int setup_volatile_state(
@@ -825,7 +1049,7 @@ int setup_volatile_state(
/* --volatile=state means we simply overmount /var
with a tmpfs, and the rest read-only. */
- r = bind_remount_recursive(directory, true);
+ r = bind_remount_recursive(directory, true, NULL);
if (r < 0)
return log_error_errno(r, "Failed to remount %s read-only: %m", directory);
@@ -835,16 +1059,13 @@ int setup_volatile_state(
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);
+ r = tmpfs_patch_options(options, userns, uid_shift, uid_range, false, 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;
+ return mount_verbose(LOG_ERR, "tmpfs", p, "tmpfs", MS_STRICTATIME, options);
}
int setup_volatile(
@@ -871,16 +1092,15 @@ int setup_volatile(
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);
+ r = tmpfs_patch_options(options, userns, uid_shift, uid_range, false, 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");
+ r = mount_verbose(LOG_ERR, "tmpfs", template, "tmpfs", MS_STRICTATIME, options);
+ if (r < 0)
goto fail;
- }
tmpfs_mounted = true;
@@ -893,23 +1113,21 @@ int setup_volatile(
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");
+ r = mount_verbose(LOG_ERR, f, t, NULL, MS_BIND|MS_REC, NULL);
+ if (r < 0)
goto fail;
- }
bind_mounted = true;
- r = bind_remount_recursive(t, true);
+ r = bind_remount_recursive(t, true, NULL);
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");
+ r = mount_verbose(LOG_ERR, template, directory, NULL, MS_MOVE, NULL);
+ if (r < 0)
goto fail;
- }
(void) rmdir(template);
@@ -917,10 +1135,10 @@ int setup_volatile(
fail:
if (bind_mounted)
- (void) umount(t);
+ (void) umount_verbose(t);
if (tmpfs_mounted)
- (void) umount(template);
+ (void) umount_verbose(template);
(void) rmdir(template);
return r;
}
generated by cgit v1.2.3 (git 2.25.1) at 2024-06-07 10:54:10 +0000