Index: sys/kern/imgact_elf.c
===================================================================
--- sys/kern/imgact_elf.c
+++ sys/kern/imgact_elf.c
@@ -322,7 +322,7 @@
 		    strcmp((const char *)&hdr->e_ident[OLD_EI_BRAND],
 		    bi->compat_3_brand) == 0))) {
 			/* Looks good, but give brand a chance to veto */
-			if (!bi->header_supported ||
+			if (bi->header_supported == NULL ||
 			    bi->header_supported(imgp)) {
 				/*
 				 * Again, prefer strictly matching
@@ -370,8 +370,12 @@
 			    /* ELF image p_filesz includes terminating zero */
 			    strlen(bi->interp_path) + 1 == interp_name_len &&
 			    strncmp(interp, bi->interp_path, interp_name_len)
-			    == 0)
-				return (bi);
+			    == 0) {
+				/* Give brand a chance to veto. */
+				if (bi->header_supported == NULL ||
+				    bi->header_supported(imgp))
+					return (bi);
+			}
 		}
 	}