+ for (a = b = u->documentation; a && *a; a++) {
+
+ if (is_valid_documentation_url(*a))
+ *(b++) = *a;
+ else {
+ log_syntax(unit, LOG_ERR, filename, line, EINVAL,
+ "Invalid URL, ignoring: %s", *a);
+ free(*a);
+ }
+ }
+ if (b)
+ *b = NULL;
+
+ return r;
+}
+
+#ifdef HAVE_SECCOMP
+int config_parse_syscall_filter(
+ const char *unit,
+ const char *filename,
+ unsigned line,
+ const char *section,
+ unsigned section_line,
+ const char *lvalue,
+ int ltype,
+ const char *rvalue,
+ void *data,
+ void *userdata) {
+
+ static const char default_syscalls[] =
+ "execve\0"
+ "exit\0"
+ "exit_group\0"
+ "rt_sigreturn\0"
+ "sigreturn\0";
+
+ ExecContext *c = data;
+ Unit *u = userdata;
+ bool invert = false;
+ char *w, *state;
+ size_t l;
+ int r;
+
+ assert(filename);
+ assert(lvalue);
+ assert(rvalue);
+ assert(u);
+
+ if (isempty(rvalue)) {
+ /* Empty assignment resets the list */
+ set_free(c->syscall_filter);
+ c->syscall_filter = NULL;
+ c->syscall_whitelist = false;
+ return 0;
+ }
+
+ if (rvalue[0] == '~') {
+ invert = true;
+ rvalue++;
+ }
+
+ if (!c->syscall_filter) {
+ c->syscall_filter = set_new(trivial_hash_func, trivial_compare_func);
+ if (!c->syscall_filter)
+ return log_oom();
+
+ if (invert)
+ /* Allow everything but the ones listed */
+ c->syscall_whitelist = false;
+ else {
+ const char *i;
+
+ /* Allow nothing but the ones listed */
+ c->syscall_whitelist = true;
+
+ /* Accept default syscalls if we are on a whitelist */
+ NULSTR_FOREACH(i, default_syscalls) {
+ int id;
+
+ id = seccomp_syscall_resolve_name(i);
+ if (id < 0)
+ continue;
+
+ r = set_put(c->syscall_filter, INT_TO_PTR(id + 1));
+ if (r == -EEXIST)
+ continue;
+ if (r < 0)
+ return log_oom();
+ }
+ }
+ }
+
+ FOREACH_WORD_QUOTED(w, l, rvalue, state) {
+ _cleanup_free_ char *t = NULL;
+ int id;
+
+ t = strndup(w, l);
+ if (!t)
+ return log_oom();
+
+ id = seccomp_syscall_resolve_name(t);
+ if (id < 0) {
+ log_syntax(unit, LOG_ERR, filename, line, EINVAL, "Failed to parse system call, ignoring: %s", t);
+ continue;
+ }
+
+ /* If we previously wanted to forbid a syscall and now
+ * we want to allow it, then remove it from the list
+ */
+ if (!invert == c->syscall_whitelist) {
+ r = set_put(c->syscall_filter, INT_TO_PTR(id + 1));
+ if (r == -EEXIST)
+ continue;
+ if (r < 0)
+ return log_oom();
+ } else
+ set_remove(c->syscall_filter, INT_TO_PTR(id + 1));
+ }
+
+ /* Turn on NNP, but only if it wasn't configured explicitly
+ * before, and only if we are in user mode. */
+ if (!c->no_new_privileges_set && u->manager->running_as == SYSTEMD_USER)
+ c->no_new_privileges = true;
+
+ return 0;
+}
+
+int config_parse_syscall_archs(
+ const char *unit,
+ const char *filename,
+ unsigned line,
+ const char *section,
+ unsigned section_line,
+ const char *lvalue,
+ int ltype,
+ const char *rvalue,
+ void *data,
+ void *userdata) {
+
+ Set **archs = data;
+ char *w, *state;
+ size_t l;
+ int r;
+
+ if (isempty(rvalue)) {
+ set_free(*archs);
+ *archs = NULL;