elfclass.h revision 275671 
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	switch (type) {
36#ifdef ELFCORE
37	case ET_CORE:
38		phnum = elf_getu16(swap, elfhdr.e_phnum);
39		if (phnum > MAX_PHNUM)
40			return toomany(ms, "program", phnum);
41		flags |= FLAGS_IS_CORE;
42		if (dophn_core(ms, clazz, swap, fd,
43		    (off_t)elf_getu(swap, elfhdr.e_phoff), phnum,
44		    (size_t)elf_getu16(swap, elfhdr.e_phentsize),
45		    fsize, &flags) == -1)
46			return -1;
47		break;
48#endif
49	case ET_EXEC:
50	case ET_DYN:
51		phnum = elf_getu16(swap, elfhdr.e_phnum);
52		if (phnum > MAX_PHNUM)
53			return toomany(ms, "program", phnum);
54		shnum = elf_getu16(swap, elfhdr.e_shnum);
55		if (shnum > MAX_SHNUM)
56			return toomany(ms, "section", shnum);
57		if (dophn_exec(ms, clazz, swap, fd,
58		    (off_t)elf_getu(swap, elfhdr.e_phoff), phnum,
59		    (size_t)elf_getu16(swap, elfhdr.e_phentsize),
60		    fsize, &flags, shnum) == -1)
61			return -1;
62		/*FALLTHROUGH*/
63	case ET_REL:
64		shnum = elf_getu16(swap, elfhdr.e_shnum);
65		if (shnum > MAX_SHNUM)
66			return toomany(ms, "section", shnum);
67		if (doshn(ms, clazz, swap, fd,
68		    (off_t)elf_getu(swap, elfhdr.e_shoff), shnum,
69		    (size_t)elf_getu16(swap, elfhdr.e_shentsize),
70		    fsize, &flags, elf_getu16(swap, elfhdr.e_machine)) == -1)
71			return -1;
72		break;
73
74	default:
75		break;
76	}
77	return 1;
78