2 * Copyright (c) 2006 Joseph Koshy
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 _libelf_sum(unsigned long c
, const unsigned char *s
, size_t size
)
34 if (s
== NULL
|| size
== 0)
44 _libelf_checksum(Elf
*e
, int elfclass
)
49 unsigned long checksum
;
54 LIBELF_SET_ERROR(ARGUMENT
, 0);
58 if (e
->e_class
!= elfclass
) {
59 LIBELF_SET_ERROR(CLASS
, 0);
63 if (gelf_getehdr(e
, &eh
) == NULL
)
67 * Iterate over all sections in the ELF file, computing the
68 * checksum along the way.
70 * The first section is always SHN_UNDEF and can be skipped.
71 * Non-allocatable sections are skipped, as are sections that
72 * could be affected by utilities such as strip(1).
76 for (shn
= 1; shn
< e
->e_u
.e_elf
.e_nscn
; shn
++) {
77 if ((scn
= elf_getscn(e
, shn
)) == NULL
)
79 if (gelf_getshdr(scn
, &shdr
) == NULL
)
81 if ((shdr
.sh_flags
& SHF_ALLOC
) == 0 ||
82 shdr
.sh_type
== SHT_DYNAMIC
||
83 shdr
.sh_type
== SHT_DYNSYM
)
87 while ((d
= elf_rawdata(scn
, d
)) != NULL
)
88 checksum
= _libelf_sum(checksum
,
89 (unsigned char *) d
->d_buf
, d
->d_size
);
93 * Return a 16-bit checksum compatible with Solaris.
95 return (((checksum
>> 16) & 0xFFFFUL
) + (checksum
& 0xFFFFUL
));