1441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project/* Compute simple checksum from permanent parts of the ELF file. 2cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng Copyright (C) 2002, 2003, 2004, 2005 Red Hat, Inc. 3cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng This file is part of Red Hat elfutils. 4441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project Written by Ulrich Drepper <drepper@redhat.com>, 2002. 5441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project 6cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng Red Hat elfutils is free software; you can redistribute it and/or modify 7cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng it under the terms of the GNU General Public License as published by the 8cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng Free Software Foundation; version 2 of the License. 9cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 10cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng Red Hat elfutils is distributed in the hope that it will be useful, but 11cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng WITHOUT ANY WARRANTY; without even the implied warranty of 12cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng General Public License for more details. 14cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 15cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng You should have received a copy of the GNU General Public License along 16cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng with Red Hat elfutils; if not, write to the Free Software Foundation, 17cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301 USA. 18cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 19cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng In addition, as a special exception, Red Hat, Inc. gives You the 20cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng additional right to link the code of Red Hat elfutils with code licensed 21cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng under any Open Source Initiative certified open source license 22cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng (http://www.opensource.org/licenses/index.php) which requires the 23cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng distribution of source code with any binary distribution and to 24cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng distribute linked combinations of the two. Non-GPL Code permitted under 25cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng this exception must only link to the code of Red Hat elfutils through 26cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng those well defined interfaces identified in the file named EXCEPTION 27cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng found in the source code files (the "Approved Interfaces"). The files 28cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng of Non-GPL Code may instantiate templates or use macros or inline 29cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng functions from the Approved Interfaces without causing the resulting 30cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng work to be covered by the GNU General Public License. Only Red Hat, 31cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng Inc. may make changes or additions to the list of Approved Interfaces. 32cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng Red Hat's grant of this exception is conditioned upon your not adding 33cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng any new exceptions. If you wish to add a new Approved Interface or 34cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng exception, please contact Red Hat. You must obey the GNU General Public 35cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng License in all respects for all of the Red Hat elfutils code and other 36cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng code used in conjunction with Red Hat elfutils except the Non-GPL Code 37cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng covered by this exception. If you modify this file, you may extend this 38cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng exception to your version of the file, but you are not obligated to do 39cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng so. If you do not wish to provide this exception without modification, 40cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng you must delete this exception statement from your version and license 41cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng this file solely under the GPL without exception. 42cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 43cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng Red Hat elfutils is an included package of the Open Invention Network. 44cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng An included package of the Open Invention Network is a package for which 45cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng Open Invention Network licensees cross-license their patents. No patent 46cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng license is granted, either expressly or impliedly, by designation as an 47cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng included package. Should you wish to participate in the Open Invention 48cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng Network licensing program, please visit www.openinventionnetwork.com 49cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng <http://www.openinventionnetwork.com>. */ 50441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project 51441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project#ifdef HAVE_CONFIG_H 52441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project# include <config.h> 53441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project#endif 54441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project 55441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project#include <assert.h> 56cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng#include <endian.h> 57441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project#include <stdbool.h> 58441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project#include <stddef.h> 59441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project#include <string.h> 60441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project 61441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project#include "gelf.h" 62441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project#include "libelfP.h" 63441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project#include "elf-knowledge.h" 64441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project 65441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project#ifndef LIBELFBITS 66441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project# define LIBELFBITS 32 67441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project#endif 68441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project 69441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project 70441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project/* The SECTION_STRIP_P macro wants to call into libebl which we cannot 71441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project do and do not have to do here. Provide a dummy replacement. */ 72441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project#define ebl_debugscn_p(ebl, name) true 73441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project 74441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project 75441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project#define process_block(crc, data) \ 76441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project __libelf_crc32 (crc, data->d_buf, data->d_size) 77441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project 78441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project 79441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Projectlong int 80441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Projectelfw2(LIBELFBITS,checksum) (elf) 81441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project Elf *elf; 82441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project{ 83441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project size_t shstrndx; 84441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project Elf_Scn *scn; 85441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project long int result = 0; 86441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project unsigned char *ident; 87441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project bool same_byte_order; 88441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project 89441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project if (elf == NULL) 90441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project return -1l; 91441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project 92441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project /* Find the section header string table. */ 93441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project if (INTUSE(elf_getshstrndx) (elf, &shstrndx) < 0) 94441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project { 95441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project /* This can only happen if the ELF handle is not for real. */ 96441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project __libelf_seterrno (ELF_E_INVALID_HANDLE); 97441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project return -1l; 98441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project } 99441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project 100441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project /* Determine whether the byte order of the file and that of the host 101441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project is the same. */ 102441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project ident = elf->state.ELFW(elf,LIBELFBITS).ehdr->e_ident; 103441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project same_byte_order = ((ident[EI_DATA] == ELFDATA2LSB 104441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project && __BYTE_ORDER == __LITTLE_ENDIAN) 105441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project || (ident[EI_DATA] == ELFDATA2MSB 106441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project && __BYTE_ORDER == __BIG_ENDIAN)); 107441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project 108cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng /* If we don't have native byte order, we will likely need to 109cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng convert the data with xlate functions. We do it upfront instead 110cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng of relocking mid-iteration. */ 111cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng if (!likely (same_byte_order)) 112cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng rwlock_wrlock (elf->lock); 113cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng else 114cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng rwlock_rdlock (elf->lock); 115cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 116441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project /* Iterate over all sections to find those which are not strippable. */ 117441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project scn = NULL; 118441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project while ((scn = INTUSE(elf_nextscn) (elf, scn)) != NULL) 119441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project { 120441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project GElf_Shdr shdr_mem; 121441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project GElf_Shdr *shdr; 122441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project Elf_Data *data; 123441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project 124441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project /* Get the section header. */ 125441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project shdr = INTUSE(gelf_getshdr) (scn, &shdr_mem); 126441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project if (shdr == NULL) 127441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project { 128441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project __libelf_seterrno (ELF_E_INVALID_SECTION_HEADER); 129cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng result = -1l; 130cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng goto out; 131441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project } 132441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project 133cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng if (SECTION_STRIP_P (shdr, 134cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng INTUSE(elf_strptr) (elf, shstrndx, shdr->sh_name), 135cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng true)) 136441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project /* The section can be stripped. Don't use it. */ 137441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project continue; 138441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project 139cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng /* Do not look at NOBITS sections. */ 140cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng if (shdr->sh_type == SHT_NOBITS) 141cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng continue; 142cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 143441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project /* To compute the checksum we need to get to the data. For 144441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project repeatable results we must use the external format. The data 145441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project we get with 'elf'getdata' might be changed for endianess 146441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project reasons. Therefore we use 'elf_rawdata' if possible. But 147441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project this function can fail if the data was constructed by the 148441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project program. In this case we have to use 'elf_getdata' and 149441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project eventually convert the data to the external format. */ 150441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project data = INTUSE(elf_rawdata) (scn, NULL); 151441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project if (data != NULL) 152441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project { 153441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project /* The raw data is available. */ 154441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project result = process_block (result, data); 155441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project 156441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project /* Maybe the user added more data. These blocks cannot be 157441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project read using 'elf_rawdata'. Simply proceed with looking 158441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project for more data block with 'elf_getdata'. */ 159441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project } 160441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project 161441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project /* Iterate through the list of data blocks. */ 162441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project while ((data = INTUSE(elf_getdata) (scn, data)) != NULL) 163441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project /* If the file byte order is the same as the host byte order 164441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project process the buffer directly. If the data is just a stream 165441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project of bytes which the library will not convert we can use it 166441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project as well. */ 167441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project if (likely (same_byte_order) || data->d_type == ELF_T_BYTE) 168441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project result = process_block (result, data); 169441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project else 170441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project { 171441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project /* Convert the data to file byte order. */ 172441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project if (INTUSE(elfw2(LIBELFBITS,xlatetof)) (data, data, ident[EI_DATA]) 173441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project == NULL) 174cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng { 175cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng result = -1l; 176cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng goto out; 177cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng } 178441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project 179441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project result = process_block (result, data); 180441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project 181441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project /* And convert it back. */ 182441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project if (INTUSE(elfw2(LIBELFBITS,xlatetom)) (data, data, ident[EI_DATA]) 183441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project == NULL) 184cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng { 185cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng result = -1l; 186cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng goto out; 187cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng } 188441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project } 189441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project } 190441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project 191cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng out: 192cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng rwlock_unlock (elf->lock); 193441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project return result; 194441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source Project} 195441f72d43a9b550baa779fc82f70816da5f74f0eThe Android Open Source ProjectINTDEF(elfw2(LIBELFBITS,checksum)) 196