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