return strdup(source);
}
+static int allocate_temporary_source(CustomMount *m) {
+ assert(m);
+ assert(!m->source);
+ assert(!m->rm_rf_tmpdir);
+
+ m->rm_rf_tmpdir = strdup("/var/tmp/nspawn-temp-XXXXXX");
+ if (!m->rm_rf_tmpdir)
+ return log_oom();
+
+ if (!mkdtemp(m->rm_rf_tmpdir)) {
+ m->rm_rf_tmpdir = mfree(m->rm_rf_tmpdir);
+ return log_error_errno(errno, "Failed to acquire temporary directory: %m");
+ }
+
+ m->source = path_join(m->rm_rf_tmpdir, "src");
+ if (!m->source)
+ return log_oom();
+
+ if (mkdir(m->source, 0755) < 0)
+ return log_error_errno(errno, "Failed to create %s: %m", m->source);
+
+ return 0;
+}
+
int custom_mount_prepare_all(const char *dest, CustomMount *l, size_t n) {
size_t i;
int r;
} else {
/* No source specified? In that case, use a throw-away temporary directory in /var/tmp */
- m->rm_rf_tmpdir = strdup("/var/tmp/nspawn-temp-XXXXXX");
- if (!m->rm_rf_tmpdir)
- return log_oom();
-
- if (!mkdtemp(m->rm_rf_tmpdir)) {
- m->rm_rf_tmpdir = mfree(m->rm_rf_tmpdir);
- return log_error_errno(errno, "Failed to acquire temporary directory: %m");
- }
-
- m->source = path_join(m->rm_rf_tmpdir, "src");
- if (!m->source)
- return log_oom();
-
- if (mkdir(m->source, 0755) < 0)
- return log_error_errno(errno, "Failed to create %s: %m", m->source);
+ r = allocate_temporary_source(m);
+ if (r < 0)
+ return r;
}
}
free_and_replace(*j, s);
}
+ if (m->source) {
+ char *s;
+
+ s = resolve_source_path(dest, m->source);
+ if (!s)
+ return log_oom();
+
+ free_and_replace(m->source, s);
+ } else {
+ r = allocate_temporary_source(m);
+ if (r < 0)
+ return r;
+ }
+
if (m->work_dir) {
char *s;
free_and_replace(m->work_dir, s);
} else {
- assert(m->source);
-
r = tempfn_random(m->source, NULL, &m->work_dir);
if (r < 0)
return log_error_errno(r, "Failed to acquire working directory: %m");
MS_BIND|MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_REMOUNT|extra_flags, NULL);
}
-static int mkdir_userns(const char *path, mode_t mode, uid_t uid_shift) {
- int r;
-
- assert(path);
-
- r = mkdir_errno_wrapper(path, mode);
- if (r < 0 && r != -EEXIST)
- return r;
-
- if (uid_shift == UID_INVALID)
- return 0;
-
- if (lchown(path, uid_shift, uid_shift) < 0)
- return -errno;
-
- return 0;
-}
-
-static int mkdir_userns_p(const char *prefix, const char *path, mode_t mode, 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, uid_shift);
- if (r < 0)
- return r;
- }
-
- return mkdir_userns(path, mode, uid_shift);
-}
-
int mount_all(const char *dest,
MountSettingsMask mount_settings,
uid_t uid_shift,
static const MountPoint mount_table[] = {
/* First we list inner child mounts (i.e. mounts applied *after* entering user namespacing) */
{ "proc", "/proc", "proc", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV,
- MOUNT_FATAL|MOUNT_IN_USERNS },
+ MOUNT_FATAL|MOUNT_IN_USERNS|MOUNT_MKDIR },
{ "/proc/sys", "/proc/sys", NULL, NULL, MS_BIND,
MOUNT_FATAL|MOUNT_IN_USERNS|MOUNT_APPLY_APIVFS_RO }, /* Bind mount first ... */
PROC_READ_ONLY("/proc/irq"),
PROC_READ_ONLY("/proc/scsi"),
- { "mqueue", "/dev/mqueue", "mqueue", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV,
- MOUNT_IN_USERNS },
+ { "mqueue", "/dev/mqueue", "mqueue", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV,
+ MOUNT_IN_USERNS|MOUNT_MKDIR },
/* Then we list outer child mounts (i.e. mounts applied *before* entering user namespacing) */
- { "tmpfs", "/tmp", "tmpfs", "mode=1777", MS_NOSUID|MS_NODEV|MS_STRICTATIME,
- MOUNT_FATAL|MOUNT_APPLY_TMPFS_TMP },
- { "tmpfs", "/sys", "tmpfs", "mode=555", MS_NOSUID|MS_NOEXEC|MS_NODEV,
- MOUNT_FATAL|MOUNT_APPLY_APIVFS_NETNS },
- { "sysfs", "/sys", "sysfs", NULL, MS_RDONLY|MS_NOSUID|MS_NOEXEC|MS_NODEV,
- MOUNT_FATAL|MOUNT_APPLY_APIVFS_RO }, /* skipped if above was mounted */
- { "sysfs", "/sys", "sysfs", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV,
- MOUNT_FATAL }, /* skipped if above was mounted */
- { "tmpfs", "/dev", "tmpfs", "mode=755", MS_NOSUID|MS_STRICTATIME,
- MOUNT_FATAL },
- { "tmpfs", "/dev/shm", "tmpfs", "mode=1777", MS_NOSUID|MS_NODEV|MS_STRICTATIME,
- MOUNT_FATAL },
- { "tmpfs", "/run", "tmpfs", "mode=755", MS_NOSUID|MS_NODEV|MS_STRICTATIME,
+ { "tmpfs", "/tmp", "tmpfs", "mode=1777" NESTED_TMPFS_LIMITS, MS_NOSUID|MS_NODEV|MS_STRICTATIME,
+ MOUNT_FATAL|MOUNT_APPLY_TMPFS_TMP|MOUNT_MKDIR },
+ { "tmpfs", "/sys", "tmpfs", "mode=555" TMPFS_LIMITS_SYS, MS_NOSUID|MS_NOEXEC|MS_NODEV,
+ MOUNT_FATAL|MOUNT_APPLY_APIVFS_NETNS|MOUNT_MKDIR },
+ { "sysfs", "/sys", "sysfs", NULL, MS_RDONLY|MS_NOSUID|MS_NOEXEC|MS_NODEV,
+ MOUNT_FATAL|MOUNT_APPLY_APIVFS_RO|MOUNT_MKDIR }, /* skipped if above was mounted */
+ { "sysfs", "/sys", "sysfs", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV,
+ MOUNT_FATAL|MOUNT_MKDIR }, /* skipped if above was mounted */
+ { "tmpfs", "/dev", "tmpfs", "mode=755" TMPFS_LIMITS_DEV, MS_NOSUID|MS_STRICTATIME,
+ MOUNT_FATAL|MOUNT_MKDIR },
+ { "tmpfs", "/dev/shm", "tmpfs", "mode=1777" NESTED_TMPFS_LIMITS, MS_NOSUID|MS_NODEV|MS_STRICTATIME,
+ MOUNT_FATAL|MOUNT_MKDIR },
+ { "tmpfs", "/run", "tmpfs", "mode=755" TMPFS_LIMITS_RUN, MS_NOSUID|MS_NODEV|MS_STRICTATIME,
+ MOUNT_FATAL|MOUNT_MKDIR },
+ { "/run/host", "/run/host", NULL, NULL, MS_BIND,
+ MOUNT_FATAL|MOUNT_MKDIR|MOUNT_PREFIX_ROOT }, /* Prepare this so that we can make it read-only when we are done */
+ { "/etc/os-release", "/run/host/os-release", NULL, NULL, MS_BIND,
+ MOUNT_TOUCH }, /* As per kernel interface requirements, bind mount first (creating mount points) and make read-only later */
+ { "/usr/lib/os-release", "/run/host/os-release", NULL, NULL, MS_BIND,
+ MOUNT_FATAL }, /* If /etc/os-release doesn't exist use the version in /usr/lib as fallback */
+ { NULL, "/run/host/os-release", NULL, NULL, MS_BIND|MS_RDONLY|MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_REMOUNT,
MOUNT_FATAL },
-
+ { NULL, "/run/host", NULL, NULL, MS_BIND|MS_RDONLY|MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_REMOUNT,
+ MOUNT_FATAL|MOUNT_IN_USERNS },
#if HAVE_SELINUX
- { "/sys/fs/selinux", "/sys/fs/selinux", NULL, NULL, MS_BIND,
- 0 }, /* Bind mount first */
- { NULL, "/sys/fs/selinux", NULL, NULL, MS_BIND|MS_RDONLY|MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_REMOUNT,
- 0 }, /* Then, make it r/o */
+ { "/sys/fs/selinux", "/sys/fs/selinux", NULL, NULL, MS_BIND,
+ MOUNT_MKDIR }, /* Bind mount first (mkdir/chown the mount point in case /sys/ is mounted as minimal skeleton tmpfs) */
+ { NULL, "/sys/fs/selinux", NULL, NULL, MS_BIND|MS_RDONLY|MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_REMOUNT,
+ 0 }, /* Then, make it r/o (don't mkdir/chown the mount point here, the previous entry already did that) */
#endif
};
int r;
for (k = 0; k < ELEMENTSOF(mount_table); k++) {
- _cleanup_free_ char *where = NULL, *options = NULL;
- const char *o;
+ _cleanup_free_ char *where = NULL, *options = NULL, *prefixed = NULL;
bool fatal = FLAGS_SET(mount_table[k].mount_settings, MOUNT_FATAL);
+ const char *o;
if (in_userns != FLAGS_SET(mount_table[k].mount_settings, MOUNT_IN_USERNS))
continue;
continue;
}
- r = mkdir_userns_p(dest, where, 0755, (use_userns && !in_userns) ? uid_shift : UID_INVALID);
- if (r < 0 && r != -EEXIST) {
- if (fatal && r != -EROFS)
- return log_error_errno(r, "Failed to create directory %s: %m", where);
+ if ((mount_table[k].mount_settings & (MOUNT_MKDIR|MOUNT_TOUCH)) != 0) {
+ uid_t u = (use_userns && !in_userns) ? uid_shift : UID_INVALID;
- log_debug_errno(r, "Failed to create directory %s: %m", where);
- /* If we failed mkdir() or chown() due to the root
- * directory being read only, attempt to mount this fs
- * anyway and let mount_verbose log any errors */
- if (r != -EROFS)
- continue;
+ if (FLAGS_SET(mount_table[k].mount_settings, MOUNT_TOUCH))
+ r = mkdir_parents_safe(dest, where, 0755, u, u, 0);
+ else
+ r = mkdir_p_safe(dest, where, 0755, u, u, 0);
+ if (r < 0 && r != -EEXIST) {
+ if (fatal && r != -EROFS)
+ return log_error_errno(r, "Failed to create directory %s: %m", where);
+
+ log_debug_errno(r, "Failed to create directory %s: %m", where);
+
+ /* If we failed mkdir() or chown() due to the root directory being read only,
+ * attempt to mount this fs anyway and let mount_verbose log any errors */
+ if (r != -EROFS)
+ continue;
+ }
+ }
+
+ if (FLAGS_SET(mount_table[k].mount_settings, MOUNT_TOUCH)) {
+ r = touch(where);
+ if (r < 0 && r != -EEXIST) {
+ if (fatal && r != -EROFS)
+ return log_error_errno(r, "Failed to create file %s: %m", where);
+
+ log_debug_errno(r, "Failed to create file %s: %m", where);
+ if (r != -EROFS)
+ continue;
+ }
}
o = mount_table[k].options;
o = options;
}
+ if (FLAGS_SET(mount_table[k].mount_settings, MOUNT_PREFIX_ROOT)) {
+ /* Optionally prefix the mount source with the root dir. This is useful in bind
+ * mounts to be created within the container image before we transition into it. Note
+ * that MOUNT_IN_USERNS is run after we transitioned hence prefixing is not ncessary
+ * for those. */
+ r = chase_symlinks(mount_table[k].what, dest, CHASE_PREFIX_ROOT, &prefixed, NULL);
+ if (r < 0)
+ return log_error_errno(r, "Failed to resolve %s/%s: %m", dest, mount_table[k].what);
+ }
+
r = mount_verbose(fatal ? LOG_ERR : LOG_DEBUG,
- mount_table[k].what,
+ prefixed ?: mount_table[k].what,
where,
mount_table[k].type,
mount_table[k].flags,
}
static int mount_inaccessible(const char *dest, CustomMount *m) {
- _cleanup_free_ char *where = NULL;
- const char *source;
+ _cleanup_free_ char *where = NULL, *source = NULL;
struct stat st;
int r;
return m->graceful ? 0 : r;
}
- assert_se(source = mode_to_inaccessible_node(st.st_mode));
+ r = mode_to_inaccessible_node(NULL, st.st_mode, &source);
+ if (r < 0)
+ return m->graceful ? 0 : r;
r = mount_verbose(m->graceful ? LOG_DEBUG : LOG_ERR, source, where, NULL, MS_BIND, NULL);
if (r < 0)
r = mount_verbose(m->graceful ? LOG_DEBUG : LOG_ERR, NULL, where, NULL, MS_BIND|MS_RDONLY|MS_REMOUNT, NULL);
if (r < 0) {
- umount_verbose(where);
+ (void) umount_verbose(where);
return m->graceful ? 0 : r;
}
return 0;
}
+bool has_custom_root_mount(const CustomMount *mounts, size_t n) {
+ size_t i;
+
+ for (i = 0; i < n; i++) {
+ const CustomMount *m = mounts + i;
+
+ if (path_equal(m->destination, "/"))
+ return true;
+ }
+
+ return false;
+}
+
static int setup_volatile_state(const char *directory, uid_t uid_shift, const char *selinux_apifs_context) {
_cleanup_free_ char *buf = NULL;
if (r < 0 && errno != EEXIST)
return log_error_errno(errno, "Failed to create %s: %m", directory);
- options = "mode=755";
+ options = "mode=755" TMPFS_LIMITS_VOLATILE_STATE;
r = tmpfs_patch_options(options, uid_shift == 0 ? UID_INVALID : uid_shift, selinux_apifs_context, &buf);
if (r < 0)
return log_oom();
if (!mkdtemp(template))
return log_error_errno(errno, "Failed to create temporary directory: %m");
- options = "mode=755";
+ options = "mode=755" TMPFS_LIMITS_ROOTFS;
r = tmpfs_patch_options(options, uid_shift == 0 ? UID_INVALID : uid_shift, selinux_apifs_context, &buf);
if (r < 0)
goto fail;
if (!mkdtemp(template))
return log_error_errno(errno, "Failed to create temporary directory: %m");
- options = "mode=755";
+ options = "mode=755" TMPFS_LIMITS_ROOTFS;
r = tmpfs_patch_options(options, uid_shift == 0 ? UID_INVALID : uid_shift, selinux_apifs_context, &buf);
if (r < 0)
goto finish;
projects / thirdparty / systemd.git / blobdiff