/* $NetBSD: libelf_phdr.c,v 1.5 2013/10/18 08:04:47 mrg Exp $ */ /*- * Copyright (c) 2006 Joseph Koshy * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * $FreeBSD: src/lib/libelf/libelf_phdr.c,v 1.2.10.1.2.1 2009/10/25 01:10:29 kensmith Exp $ */ #if HAVE_NBTOOL_CONFIG_H # include "nbtool_config.h" #endif #include /* __FBSDID("$FreeBSD: src/lib/libelf/libelf_phdr.c,v 1.2.10.1.2.1 2009/10/25 01:10:29 kensmith Exp $"); */ #include #include #include #include #include "_libelf.h" void * _libelf_getphdr(Elf *e, int ec) { size_t phnum; size_t fsz, msz; uint64_t phoff; Elf32_Ehdr *eh32; Elf64_Ehdr *eh64; void *ehdr, *phdr; void (*xlator)(char *_d, char *_s, size_t _c, int _swap); assert(ec == ELFCLASS32 || ec == ELFCLASS64); if (e == NULL) { LIBELF_SET_ERROR(ARGUMENT, 0); return (NULL); } if ((phdr = (ec == ELFCLASS32 ? (void *) e->e_u.e_elf.e_phdr.e_phdr32 : (void *) e->e_u.e_elf.e_phdr.e_phdr64)) != NULL) return (phdr); /* * Check the PHDR related fields in the EHDR for sanity. */ if ((ehdr = _libelf_ehdr(e, ec, 0)) == NULL) return (NULL); phnum = e->e_u.e_elf.e_nphdr; if (ec == ELFCLASS32) { eh32 = (Elf32_Ehdr *) ehdr; phoff = (uint64_t) eh32->e_phoff; } else { eh64 = (Elf64_Ehdr *) ehdr; phoff = (uint64_t) eh64->e_phoff; } fsz = gelf_fsize(e, ELF_T_PHDR, phnum, e->e_version); assert(fsz > 0); if ((uint64_t) e->e_rawsize < (phoff + fsz)) { LIBELF_SET_ERROR(HEADER, 0); return (NULL); } msz = _libelf_msize(ELF_T_PHDR, ec, EV_CURRENT); assert(msz > 0); if ((phdr = calloc(phnum, msz)) == NULL) { LIBELF_SET_ERROR(RESOURCE, 0); return (NULL); } if (ec == ELFCLASS32) e->e_u.e_elf.e_phdr.e_phdr32 = phdr; else e->e_u.e_elf.e_phdr.e_phdr64 = phdr; xlator = _libelf_get_translator(ELF_T_PHDR, ELF_TOMEMORY, ec); (*xlator)(phdr, e->e_rawfile + phoff, phnum, e->e_byteorder != _libelf_host_byteorder()); return (phdr); } void * _libelf_newphdr(Elf *e, int ec, size_t count) { void *ehdr, *newphdr, *oldphdr; size_t msz; if (e == NULL) { LIBELF_SET_ERROR(ARGUMENT, 0); return (NULL); } if ((ehdr = _libelf_ehdr(e, ec, 0)) == NULL) { LIBELF_SET_ERROR(SEQUENCE, 0); return (NULL); } assert(e->e_class == ec); assert(ec == ELFCLASS32 || ec == ELFCLASS64); assert(e->e_version == EV_CURRENT); msz = _libelf_msize(ELF_T_PHDR, ec, e->e_version); assert(msz > 0); newphdr = NULL; if (count > 0 && (newphdr = calloc(count, msz)) == NULL) { LIBELF_SET_ERROR(RESOURCE, 0); return (NULL); } if (ec == ELFCLASS32) { if ((oldphdr = (void *) e->e_u.e_elf.e_phdr.e_phdr32) != NULL) free(oldphdr); e->e_u.e_elf.e_phdr.e_phdr32 = (Elf32_Phdr *) newphdr; } else { if ((oldphdr = (void *) e->e_u.e_elf.e_phdr.e_phdr64) != NULL) free(oldphdr); e->e_u.e_elf.e_phdr.e_phdr64 = (Elf64_Phdr *) newphdr; } e->e_u.e_elf.e_nphdr = count; elf_flagphdr(e, ELF_C_SET, ELF_F_DIRTY); return (newphdr); }