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-rw-r--r--src/core/namespace.c80
1 files changed, 70 insertions, 10 deletions
diff --git a/src/core/namespace.c b/src/core/namespace.c
index bee2839f54..5b782798c8 100644
--- a/src/core/namespace.c
+++ b/src/core/namespace.c
@@ -36,6 +36,7 @@
#include "dev-setup.h"
#include "selinux-util.h"
#include "namespace.h"
+#include "mkdir.h"
typedef enum MountMode {
/* This is ordered by priority! */
@@ -124,6 +125,22 @@ static void drop_duplicates(BindMount *m, unsigned *n) {
*n = t - m;
}
+static int mount_move_root(const char *path) {
+ if (chdir(path) < 0)
+ return -errno;
+
+ if (mount(path, "/", NULL, MS_MOVE, NULL) < 0)
+ return -errno;
+
+ if (chroot(".") < 0)
+ return -errno;
+
+ if (chdir("/") < 0)
+ return -errno;
+
+ return 0;
+}
+
static int mount_dev(BindMount *m) {
static const char devnodes[] =
"/dev/null\0"
@@ -225,7 +242,13 @@ static int mount_dev(BindMount *m) {
dev_setup(temporary_mount);
- if (mount(dev, "/dev/", NULL, MS_MOVE, NULL) < 0) {
+ /* Create the /dev directory if missing. It is more likely to be
+ * missing when the service is started with RootDirectory. This is
+ * consistent with mount units creating the mount points when missing.
+ */
+ (void) mkdir_p_label(m->path, 0755);
+
+ if (mount(dev, m->path, NULL, MS_MOVE, NULL) < 0) {
r = -errno;
goto fail;
}
@@ -404,6 +427,7 @@ static int make_read_only(BindMount *m) {
}
int setup_namespace(
+ const char* root_directory,
char** read_write_dirs,
char** read_only_dirs,
char** inaccessible_dirs,
@@ -449,37 +473,56 @@ int setup_namespace(
return r;
if (tmp_dir) {
- m->path = "/tmp";
+ m->path = prefix_roota(root_directory, "/tmp");
m->mode = PRIVATE_TMP;
m++;
}
if (var_tmp_dir) {
- m->path = "/var/tmp";
+ m->path = prefix_roota(root_directory, "/var/tmp");
m->mode = PRIVATE_VAR_TMP;
m++;
}
if (private_dev) {
- m->path = "/dev";
+ m->path = prefix_roota(root_directory, "/dev");
m->mode = PRIVATE_DEV;
m++;
}
if (bus_endpoint_path) {
- m->path = bus_endpoint_path;
+ m->path = prefix_roota(root_directory, bus_endpoint_path);
m->mode = PRIVATE_BUS_ENDPOINT;
m++;
}
if (protect_home != PROTECT_HOME_NO) {
- r = append_mounts(&m, STRV_MAKE("-/home", "-/run/user", "-/root"), protect_home == PROTECT_HOME_READ_ONLY ? READONLY : INACCESSIBLE);
+ const char *home_dir, *run_user_dir, *root_dir;
+
+ home_dir = prefix_roota(root_directory, "/home");
+ home_dir = strjoina("-", home_dir);
+ run_user_dir = prefix_roota(root_directory, "/run/user");
+ run_user_dir = strjoina("-", run_user_dir);
+ root_dir = prefix_roota(root_directory, "/root");
+ root_dir = strjoina("-", root_dir);
+
+ r = append_mounts(&m, STRV_MAKE(home_dir, run_user_dir, root_dir),
+ protect_home == PROTECT_HOME_READ_ONLY ? READONLY : INACCESSIBLE);
if (r < 0)
return r;
}
if (protect_system != PROTECT_SYSTEM_NO) {
- r = append_mounts(&m, protect_system == PROTECT_SYSTEM_FULL ? STRV_MAKE("/usr", "-/boot", "/etc") : STRV_MAKE("/usr", "-/boot"), READONLY);
+ const char *usr_dir, *boot_dir, *etc_dir;
+
+ usr_dir = prefix_roota(root_directory, "/home");
+ boot_dir = prefix_roota(root_directory, "/boot");
+ boot_dir = strjoina("-", boot_dir);
+ etc_dir = prefix_roota(root_directory, "/etc");
+
+ r = append_mounts(&m, protect_system == PROTECT_SYSTEM_FULL
+ ? STRV_MAKE(usr_dir, boot_dir, etc_dir)
+ : STRV_MAKE(usr_dir, boot_dir), READONLY);
if (r < 0)
return r;
}
@@ -490,12 +533,20 @@ int setup_namespace(
drop_duplicates(mounts, &n);
}
- if (n > 0) {
+ if (n > 0 || root_directory) {
/* Remount / as SLAVE so that nothing now mounted in the namespace
shows up in the parent */
if (mount(NULL, "/", NULL, MS_SLAVE|MS_REC, NULL) < 0)
return -errno;
+ }
+
+ if (root_directory) {
+ /* Turn directory into bind mount */
+ if (mount(root_directory, root_directory, NULL, MS_BIND|MS_REC, NULL) < 0)
+ return -errno;
+ }
+ if (n > 0) {
for (m = mounts; m < mounts + n; ++m) {
r = apply_mount(m, tmp_dir, var_tmp_dir);
if (r < 0)
@@ -509,12 +560,21 @@ int setup_namespace(
}
}
+ if (root_directory) {
+ /* MS_MOVE does not work on MS_SHARED so the remount MS_SHARED will be done later */
+ r = mount_move_root(root_directory);
+
+ /* at this point, we cannot rollback */
+ if (r < 0)
+ return r;
+ }
+
/* Remount / as the desired mode. Not that this will not
* reestablish propagation from our side to the host, since
* what's disconnected is disconnected. */
if (mount(NULL, "/", NULL, mount_flags | MS_REC, NULL) < 0) {
- r = -errno;
- goto fail;
+ /* at this point, we cannot rollback */
+ return -errno;
}
return 0;