1/*	$NetBSD: freebsd_exec_elf32.c,v 1.21 2017/08/08 08:04:06 maxv Exp $	*/
2
3/*
4 * Copyright (c) 1993, 1994 Christopher G. Demetriou
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. All advertising materials mentioning features or use of this software
16 *    must display the following acknowledgement:
17 *      This product includes software developed by Christopher G. Demetriou.
18 * 4. The name of the author may not be used to endorse or promote products
19 *    derived from this software without specific prior written permission
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
22 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
23 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
24 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
26 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
30 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31 */
32
33#include <sys/cdefs.h>
34__KERNEL_RCSID(0, "$NetBSD: freebsd_exec_elf32.c,v 1.21 2017/08/08 08:04:06 maxv Exp $");
35
36#include <sys/param.h>
37#include <sys/systm.h>
38#include <sys/proc.h>
39#include <sys/vnode.h>
40#include <sys/exec.h>
41#ifndef ELFSIZE
42#  define ELFSIZE 32
43#endif /* !ELFSIZE */
44#include <sys/exec_elf.h>
45
46#include <compat/freebsd/freebsd_exec.h>
47#include <compat/common/compat_util.h>
48
49#include <compat/freebsd/freebsd_machdep.h>
50
51int
52ELFNAME2(freebsd,probe)(struct lwp *l, struct exec_package *epp, void *veh,
53    char *itp, vaddr_t *pos)
54{
55	int error;
56	Elf_Ehdr *eh = (Elf_Ehdr *) veh;
57	static const char wantBrand[] = FREEBSD_ELF_BRAND_STRING;
58	static const char wantInterp[] = FREEBSD_ELF_INTERP_PREFIX_STRING;
59
60	/*
61	 * Insist that the executable have a brand, and that it be "FreeBSD".
62	 * Newer FreeBSD binaries have OSABI set to ELFOSABI_FREEBSD. This
63	 * is arguably broken, but they seem to think they need it, for
64	 * whatever reason.
65	 */
66#ifndef EI_BRAND
67#define EI_BRAND 8
68#endif
69	if ((eh->e_ident[EI_BRAND] == '\0' ||
70	     strcmp(&eh->e_ident[EI_BRAND], wantBrand) != 0) &&
71		eh->e_ident[EI_OSABI] != ELFOSABI_FREEBSD)
72		return ENOEXEC;
73
74	if (itp) {
75		if (strncmp(itp, wantInterp, sizeof(wantInterp) - 1))
76			return ENOEXEC;
77		if ((error = emul_find_interp(l, epp, itp)))
78			return error;
79	}
80
81	return 0;
82}
83