1 files changed, 10 insertions, 0 deletions
diff --git a/src/shared/reboot-util.c b/src/shared/reboot-util.c
index 62ff697..b1c1aa7 100644
--- a/src/shared/reboot-util.c
+++ b/src/shared/reboot-util.c
@@ -23,8 +23,15 @@
 #include "reboot-util.h"
 #include "string-util.h"
 #include "umask-util.h"
+#include "utf8.h"
 #include "virt.h"
 
+bool reboot_parameter_is_valid(const char *parameter) {
+        assert(parameter);
+
+        return ascii_is_valid(parameter) && strlen(parameter) <= NAME_MAX;
+}
+
 int update_reboot_parameter_and_warn(const char *parameter, bool keep) {
         int r;
 
@@ -42,6 +49,9 @@ int update_reboot_parameter_and_warn(const char *parameter, bool keep) {
                 return 0;
         }
 
+        if (!reboot_parameter_is_valid(parameter))
+                return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Invalid reboot parameter '%s'.", parameter);
+
         WITH_UMASK(0022) {
                 r = write_string_file("/run/systemd/reboot-param", parameter,
                                       WRITE_STRING_FILE_CREATE|WRITE_STRING_FILE_ATOMIC);