1/*	$NetBSD: elfclass.h,v 1.1.1.8 2019/05/22 17:19:56 christos Exp $	*/
2
3/*
4 * Copyright (c) Christos Zoulas 2008.
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 immediately at the beginning of the file, without modification,
12 *    this list of conditions, and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
21 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29	if (nbytes <= sizeof(elfhdr))
30		return 0;
31
32	u.l = 1;
33	(void)memcpy(&elfhdr, buf, sizeof elfhdr);
34	swap = (u.c[sizeof(int32_t) - 1] + 1) != elfhdr.e_ident[EI_DATA];
35
36	type = elf_getu16(swap, elfhdr.e_type);
37	notecount = ms->elf_notes_max;
38	switch (type) {
39#ifdef ELFCORE
40	case ET_CORE:
41		phnum = elf_getu16(swap, elfhdr.e_phnum);
42		if (phnum > ms->elf_phnum_max)
43			return toomany(ms, "program headers", phnum);
44		flags |= FLAGS_IS_CORE;
45		if (dophn_core(ms, clazz, swap, fd,
46		    CAST(off_t, elf_getu(swap, elfhdr.e_phoff)), phnum,
47		    CAST(size_t, elf_getu16(swap, elfhdr.e_phentsize)),
48		    fsize, &flags, &notecount) == -1)
49			return -1;
50		break;
51#endif
52	case ET_EXEC:
53	case ET_DYN:
54		phnum = elf_getu16(swap, elfhdr.e_phnum);
55		if (phnum > ms->elf_phnum_max)
56			return toomany(ms, "program", phnum);
57		shnum = elf_getu16(swap, elfhdr.e_shnum);
58		if (shnum > ms->elf_shnum_max)
59			return toomany(ms, "section", shnum);
60		if (dophn_exec(ms, clazz, swap, fd,
61		    CAST(off_t, elf_getu(swap, elfhdr.e_phoff)), phnum,
62		    CAST(size_t, elf_getu16(swap, elfhdr.e_phentsize)),
63		    fsize, shnum, &flags, &notecount) == -1)
64			return -1;
65		/*FALLTHROUGH*/
66	case ET_REL:
67		shnum = elf_getu16(swap, elfhdr.e_shnum);
68		if (shnum > ms->elf_shnum_max)
69			return toomany(ms, "section headers", shnum);
70		if (doshn(ms, clazz, swap, fd,
71		    CAST(off_t, elf_getu(swap, elfhdr.e_shoff)), shnum,
72		    CAST(size_t, elf_getu16(swap, elfhdr.e_shentsize)),
73		    fsize, elf_getu16(swap, elfhdr.e_machine),
74		    CAST(int, elf_getu16(swap, elfhdr.e_shstrndx)),
75		    &flags, &notecount) == -1)
76			return -1;
77		break;
78
79	default:
80		break;
81	}
82	if (notecount == 0)
83		return toomany(ms, "notes", ms->elf_notes_max);
84	return 1;
85