Index: sys/kern/imgact_elf.c
===================================================================
--- sys/kern/imgact_elf.c
+++ sys/kern/imgact_elf.c
@@ -1171,6 +1171,7 @@
 		goto ret;
 	}
 	sv = brand_info->sysvec;
+	sv->brand_info = brand_info;
 	et_dyn_addr = 0;
 	if (hdr->e_type == ET_DYN) {
 		if ((brand_info->flags & BI_CAN_EXEC_DYN) == 0) {
Index: sys/sys/imgact_elf.h
===================================================================
--- sys/sys/imgact_elf.h
+++ sys/sys/imgact_elf.h
@@ -89,6 +89,7 @@
 	Elf_Brandnote *brand_note;
 	boolean_t	(*header_supported)(struct image_params *,
 	    int32_t *, uint32_t *);
+		/* High 8 bits of flags is private to the ABI */
 #define	BI_CAN_EXEC_DYN		0x0001
 #define	BI_BRAND_NOTE		0x0002	/* May have note.ABI-tag section. */
 #define	BI_BRAND_NOTE_MANDATORY	0x0004	/* Must have note.ABI-tag section. */
Index: sys/sys/sysent.h
===================================================================
--- sys/sys/sysent.h
+++ sys/sys/sysent.h
@@ -150,6 +150,7 @@
 	void		(*sv_ontdexit)(struct thread *td);
 	int		(*sv_setid_allowed)(struct thread *td,
 			    struct image_params *imgp);
+	void		*brand_info;	/* Elf_Brandinfo, NULL for non Elf binaries */
 };
 
 #define	SV_ILP32	0x000100	/* 32-bit executable. */