14484Sbinkertn@umich.edu/*- 24484Sbinkertn@umich.edu * Copyright (c) 2006 Joseph Koshy 34484Sbinkertn@umich.edu * All rights reserved. 44484Sbinkertn@umich.edu * 54484Sbinkertn@umich.edu * Redistribution and use in source and binary forms, with or without 64484Sbinkertn@umich.edu * modification, are permitted provided that the following conditions 74484Sbinkertn@umich.edu * are met: 84484Sbinkertn@umich.edu * 1. Redistributions of source code must retain the above copyright 94484Sbinkertn@umich.edu * notice, this list of conditions and the following disclaimer. 104484Sbinkertn@umich.edu * 2. Redistributions in binary form must reproduce the above copyright 114484Sbinkertn@umich.edu * notice, this list of conditions and the following disclaimer in the 124484Sbinkertn@umich.edu * documentation and/or other materials provided with the distribution. 134484Sbinkertn@umich.edu * 144484Sbinkertn@umich.edu * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 154484Sbinkertn@umich.edu * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 164484Sbinkertn@umich.edu * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 174484Sbinkertn@umich.edu * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 184484Sbinkertn@umich.edu * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 194484Sbinkertn@umich.edu * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 204484Sbinkertn@umich.edu * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 214484Sbinkertn@umich.edu * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 224484Sbinkertn@umich.edu * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 234484Sbinkertn@umich.edu * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 244484Sbinkertn@umich.edu * SUCH DAMAGE. 254484Sbinkertn@umich.edu */ 264484Sbinkertn@umich.edu 274484Sbinkertn@umich.edu#include "gelf.h" 284484Sbinkertn@umich.edu 294484Sbinkertn@umich.edu#include "_libelf.h" 304484Sbinkertn@umich.edu 314484Sbinkertn@umich.edustatic unsigned long 324484Sbinkertn@umich.edu_libelf_sum(unsigned long c, const unsigned char *s, size_t size) 334484Sbinkertn@umich.edu{ 344484Sbinkertn@umich.edu if (s == NULL || size == 0) 354484Sbinkertn@umich.edu return (c); 364484Sbinkertn@umich.edu 374484Sbinkertn@umich.edu while (size--) 384484Sbinkertn@umich.edu c += *s++; 394484Sbinkertn@umich.edu 404484Sbinkertn@umich.edu return (c); 414484Sbinkertn@umich.edu} 424484Sbinkertn@umich.edu 434484Sbinkertn@umich.eduunsigned long 444484Sbinkertn@umich.edu_libelf_checksum(Elf *e, int elfclass) 454484Sbinkertn@umich.edu{ 464484Sbinkertn@umich.edu size_t shn; 474484Sbinkertn@umich.edu Elf_Scn *scn; 484484Sbinkertn@umich.edu Elf_Data *d; 494484Sbinkertn@umich.edu unsigned long checksum; 504484Sbinkertn@umich.edu GElf_Ehdr eh; 514484Sbinkertn@umich.edu GElf_Shdr shdr; 524484Sbinkertn@umich.edu 534484Sbinkertn@umich.edu if (e == NULL) { 544484Sbinkertn@umich.edu LIBELF_SET_ERROR(ARGUMENT, 0); 554484Sbinkertn@umich.edu return (0L); 564484Sbinkertn@umich.edu } 574484Sbinkertn@umich.edu 584484Sbinkertn@umich.edu if (e->e_class != elfclass) { 594484Sbinkertn@umich.edu LIBELF_SET_ERROR(CLASS, 0); 604484Sbinkertn@umich.edu return (0L); 614484Sbinkertn@umich.edu } 624484Sbinkertn@umich.edu 634484Sbinkertn@umich.edu if (gelf_getehdr(e, &eh) == NULL) 644484Sbinkertn@umich.edu return (0); 654484Sbinkertn@umich.edu 664484Sbinkertn@umich.edu /* 674484Sbinkertn@umich.edu * Iterate over all sections in the ELF file, computing the 684484Sbinkertn@umich.edu * checksum along the way. 694484Sbinkertn@umich.edu * 704484Sbinkertn@umich.edu * The first section is always SHN_UNDEF and can be skipped. 714484Sbinkertn@umich.edu * Non-allocatable sections are skipped, as are sections that 724484Sbinkertn@umich.edu * could be affected by utilities such as strip(1). 734484Sbinkertn@umich.edu */ 744484Sbinkertn@umich.edu 754484Sbinkertn@umich.edu checksum = 0; 764484Sbinkertn@umich.edu for (shn = 1; shn < e->e_u.e_elf.e_nscn; shn++) { 774484Sbinkertn@umich.edu if ((scn = elf_getscn(e, shn)) == NULL) 784484Sbinkertn@umich.edu return (0); 794484Sbinkertn@umich.edu if (gelf_getshdr(scn, &shdr) == NULL) 804484Sbinkertn@umich.edu return (0); 814484Sbinkertn@umich.edu if ((shdr.sh_flags & SHF_ALLOC) == 0 || 824484Sbinkertn@umich.edu shdr.sh_type == SHT_DYNAMIC || 834484Sbinkertn@umich.edu shdr.sh_type == SHT_DYNSYM) 844484Sbinkertn@umich.edu continue; 854484Sbinkertn@umich.edu 864484Sbinkertn@umich.edu d = NULL; 874484Sbinkertn@umich.edu while ((d = elf_rawdata(scn, d)) != NULL) 884484Sbinkertn@umich.edu checksum = _libelf_sum(checksum, 894484Sbinkertn@umich.edu (unsigned char *) d->d_buf, d->d_size); 904484Sbinkertn@umich.edu } 914484Sbinkertn@umich.edu 924484Sbinkertn@umich.edu /* 934484Sbinkertn@umich.edu * Return a 16-bit checksum compatible with Solaris. 944484Sbinkertn@umich.edu */ 954484Sbinkertn@umich.edu return (((checksum >> 16) & 0xFFFFUL) + (checksum & 0xFFFFUL)); 964484Sbinkertn@umich.edu} 97