libelf_phdr.c revision 4484
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 * $FreeBSD: src/lib/libelf/libelf_phdr.c,v 1.2 2006/12/25 02:22:22 jkoshy Exp $ 274484Sbinkertn@umich.edu */ 284484Sbinkertn@umich.edu 294484Sbinkertn@umich.edu#include <assert.h> 304484Sbinkertn@umich.edu#include <stdlib.h> 314484Sbinkertn@umich.edu 324484Sbinkertn@umich.edu#include "gelf.h" 334484Sbinkertn@umich.edu#include "libelf.h" 344484Sbinkertn@umich.edu#include "_libelf.h" 354484Sbinkertn@umich.edu 364484Sbinkertn@umich.eduvoid * 374484Sbinkertn@umich.edu_libelf_getphdr(Elf *e, int ec) 384484Sbinkertn@umich.edu{ 394484Sbinkertn@umich.edu size_t phnum, phentsize; 404484Sbinkertn@umich.edu size_t fsz, msz; 414484Sbinkertn@umich.edu uint64_t phoff; 424484Sbinkertn@umich.edu Elf32_Ehdr *eh32; 434484Sbinkertn@umich.edu Elf64_Ehdr *eh64; 444484Sbinkertn@umich.edu void *ehdr, *phdr; 454484Sbinkertn@umich.edu void (*xlator)(char *_d, char *_s, size_t _c, int _swap); 464484Sbinkertn@umich.edu 474484Sbinkertn@umich.edu assert(ec == ELFCLASS32 || ec == ELFCLASS64); 484484Sbinkertn@umich.edu 494484Sbinkertn@umich.edu if (e == NULL) { 504484Sbinkertn@umich.edu LIBELF_SET_ERROR(ARGUMENT, 0); 514484Sbinkertn@umich.edu return (NULL); 524484Sbinkertn@umich.edu } 534484Sbinkertn@umich.edu 544484Sbinkertn@umich.edu if ((phdr = (ec == ELFCLASS32 ? 554484Sbinkertn@umich.edu (void *) e->e_u.e_elf.e_phdr.e_phdr32 : 564484Sbinkertn@umich.edu (void *) e->e_u.e_elf.e_phdr.e_phdr64)) != NULL) 574484Sbinkertn@umich.edu return (phdr); 584484Sbinkertn@umich.edu 594484Sbinkertn@umich.edu /* 604484Sbinkertn@umich.edu * Check the PHDR related fields in the EHDR for sanity. 614484Sbinkertn@umich.edu */ 624484Sbinkertn@umich.edu 634484Sbinkertn@umich.edu if ((ehdr = _libelf_ehdr(e, ec, 0)) == NULL) 644484Sbinkertn@umich.edu return (NULL); 654484Sbinkertn@umich.edu 664484Sbinkertn@umich.edu phnum = e->e_u.e_elf.e_nphdr; 674484Sbinkertn@umich.edu 684484Sbinkertn@umich.edu if (ec == ELFCLASS32) { 694484Sbinkertn@umich.edu eh32 = (Elf32_Ehdr *) ehdr; 704484Sbinkertn@umich.edu phentsize = eh32->e_phentsize; 714484Sbinkertn@umich.edu phoff = (uint64_t) eh32->e_phoff; 724484Sbinkertn@umich.edu } else { 734484Sbinkertn@umich.edu eh64 = (Elf64_Ehdr *) ehdr; 744484Sbinkertn@umich.edu phentsize = eh64->e_phentsize; 754484Sbinkertn@umich.edu phoff = (uint64_t) eh64->e_phoff; 764484Sbinkertn@umich.edu } 774484Sbinkertn@umich.edu 784484Sbinkertn@umich.edu fsz = gelf_fsize(e, ELF_T_PHDR, phnum, e->e_version); 794484Sbinkertn@umich.edu 804484Sbinkertn@umich.edu assert(fsz > 0); 814484Sbinkertn@umich.edu 824484Sbinkertn@umich.edu if ((uint64_t) e->e_rawsize < (phoff + fsz)) { 834484Sbinkertn@umich.edu LIBELF_SET_ERROR(HEADER, 0); 844484Sbinkertn@umich.edu return (NULL); 854484Sbinkertn@umich.edu } 864484Sbinkertn@umich.edu 874484Sbinkertn@umich.edu msz = _libelf_msize(ELF_T_PHDR, ec, EV_CURRENT); 884484Sbinkertn@umich.edu 894484Sbinkertn@umich.edu assert(msz > 0); 904484Sbinkertn@umich.edu 914484Sbinkertn@umich.edu if ((phdr = calloc(phnum, msz)) == NULL) { 924484Sbinkertn@umich.edu LIBELF_SET_ERROR(RESOURCE, 0); 934484Sbinkertn@umich.edu return (NULL); 944484Sbinkertn@umich.edu } 954484Sbinkertn@umich.edu 964484Sbinkertn@umich.edu if (ec == ELFCLASS32) 974484Sbinkertn@umich.edu e->e_u.e_elf.e_phdr.e_phdr32 = phdr; 984484Sbinkertn@umich.edu else 994484Sbinkertn@umich.edu e->e_u.e_elf.e_phdr.e_phdr64 = phdr; 1004484Sbinkertn@umich.edu 1014484Sbinkertn@umich.edu 1024484Sbinkertn@umich.edu xlator = _libelf_get_translator(ELF_T_PHDR, ELF_TOMEMORY, ec); 1034484Sbinkertn@umich.edu (*xlator)(phdr, e->e_rawfile + phoff, phnum, 1044484Sbinkertn@umich.edu e->e_byteorder != LIBELF_PRIVATE(byteorder)); 1054484Sbinkertn@umich.edu 1064484Sbinkertn@umich.edu return (phdr); 1074484Sbinkertn@umich.edu} 1084484Sbinkertn@umich.edu 1094484Sbinkertn@umich.eduvoid * 1104484Sbinkertn@umich.edu_libelf_newphdr(Elf *e, int ec, size_t count) 1114484Sbinkertn@umich.edu{ 1124484Sbinkertn@umich.edu void *ehdr, *newphdr, *oldphdr; 1134484Sbinkertn@umich.edu size_t msz; 1144484Sbinkertn@umich.edu 1154484Sbinkertn@umich.edu if (e == NULL) { 1164484Sbinkertn@umich.edu LIBELF_SET_ERROR(ARGUMENT, 0); 1174484Sbinkertn@umich.edu return (NULL); 1184484Sbinkertn@umich.edu } 1194484Sbinkertn@umich.edu 1204484Sbinkertn@umich.edu if ((ehdr = _libelf_ehdr(e, ec, 0)) == NULL) { 1214484Sbinkertn@umich.edu LIBELF_SET_ERROR(SEQUENCE, 0); 1224484Sbinkertn@umich.edu return (NULL); 1234484Sbinkertn@umich.edu } 1244484Sbinkertn@umich.edu 1254484Sbinkertn@umich.edu assert(e->e_class == ec); 1264484Sbinkertn@umich.edu assert(ec == ELFCLASS32 || ec == ELFCLASS64); 1274484Sbinkertn@umich.edu assert(e->e_version == EV_CURRENT); 1284484Sbinkertn@umich.edu 1294484Sbinkertn@umich.edu msz = _libelf_msize(ELF_T_PHDR, ec, e->e_version); 1304484Sbinkertn@umich.edu 1314484Sbinkertn@umich.edu assert(msz > 0); 1324484Sbinkertn@umich.edu 1334484Sbinkertn@umich.edu newphdr = NULL; 1344484Sbinkertn@umich.edu if (count > 0 && (newphdr = calloc(count, msz)) == NULL) { 1354484Sbinkertn@umich.edu LIBELF_SET_ERROR(RESOURCE, 0); 1364484Sbinkertn@umich.edu return (NULL); 1374484Sbinkertn@umich.edu } 1384484Sbinkertn@umich.edu 1394484Sbinkertn@umich.edu if (ec == ELFCLASS32) { 1404484Sbinkertn@umich.edu if ((oldphdr = (void *) e->e_u.e_elf.e_phdr.e_phdr32) != NULL) 1414484Sbinkertn@umich.edu free(oldphdr); 1424484Sbinkertn@umich.edu e->e_u.e_elf.e_phdr.e_phdr32 = (Elf32_Phdr *) newphdr; 1434484Sbinkertn@umich.edu } else { 1444484Sbinkertn@umich.edu if ((oldphdr = (void *) e->e_u.e_elf.e_phdr.e_phdr64) != NULL) 1454484Sbinkertn@umich.edu free(oldphdr); 1464484Sbinkertn@umich.edu e->e_u.e_elf.e_phdr.e_phdr64 = (Elf64_Phdr *) newphdr; 1474484Sbinkertn@umich.edu } 1484484Sbinkertn@umich.edu 1494484Sbinkertn@umich.edu e->e_u.e_elf.e_nphdr = count; 1504484Sbinkertn@umich.edu 1514484Sbinkertn@umich.edu elf_flagphdr(e, ELF_C_SET, ELF_F_DIRTY); 1524484Sbinkertn@umich.edu 1534484Sbinkertn@umich.edu return (newphdr); 1544484Sbinkertn@umich.edu} 155