1 /* $NetBSD: libelf_memory.c,v 1.3 2016/02/20 02:43:42 christos Exp $ */ 2 3 /*- 4 * Copyright (c) 2011 Joseph Koshy 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #if HAVE_NBTOOL_CONFIG_H 30 # include "nbtool_config.h" 31 #endif 32 33 #include <ar.h> 34 #include <assert.h> 35 #include <string.h> 36 #include <libelf.h> 37 38 #include "_libelf.h" 39 40 __RCSID("$NetBSD: libelf_memory.c,v 1.3 2016/02/20 02:43:42 christos Exp $"); 41 ELFTC_VCSID("Id: libelf_memory.c 3013 2014-03-23 06:16:59Z jkoshy "); 42 43 /* 44 * Create an ELF descriptor for a memory image, optionally reporting 45 * parse errors. 46 */ 47 48 Elf * 49 _libelf_memory(unsigned char *image, size_t sz, int reporterror) 50 { 51 Elf *e; 52 int e_class; 53 enum Elf_Error error; 54 unsigned int e_byteorder, e_version; 55 56 assert(image != NULL); 57 assert(sz > 0); 58 59 if ((e = _libelf_allocate_elf()) == NULL) 60 return (NULL); 61 62 e->e_cmd = ELF_C_READ; 63 e->e_rawfile = image; 64 e->e_rawsize = sz; 65 66 #undef LIBELF_IS_ELF 67 #define LIBELF_IS_ELF(P) ((P)[EI_MAG0] == ELFMAG0 && \ 68 (P)[EI_MAG1] == ELFMAG1 && (P)[EI_MAG2] == ELFMAG2 && \ 69 (P)[EI_MAG3] == ELFMAG3) 70 71 if (sz > EI_NIDENT && LIBELF_IS_ELF(image)) { 72 e_byteorder = image[EI_DATA]; 73 e_class = image[EI_CLASS]; 74 e_version = image[EI_VERSION]; 75 76 error = ELF_E_NONE; 77 78 if (e_version > EV_CURRENT) 79 error = ELF_E_VERSION; 80 else if ((e_byteorder != ELFDATA2LSB && e_byteorder != 81 ELFDATA2MSB) || (e_class != ELFCLASS32 && e_class != 82 ELFCLASS64)) 83 error = ELF_E_HEADER; 84 85 if (error != ELF_E_NONE) { 86 if (reporterror) { 87 LIBELF_PRIVATE(error) = LIBELF_ERROR(error, 0); 88 (void) _libelf_release_elf(e); 89 return (NULL); 90 } 91 } else { 92 _libelf_init_elf(e, ELF_K_ELF); 93 94 e->e_byteorder = e_byteorder; 95 e->e_class = e_class; 96 e->e_version = e_version; 97 } 98 } else if (sz >= SARMAG && 99 strncmp((const char *) image, ARMAG, (size_t) SARMAG) == 0) 100 return (_libelf_ar_open(e, reporterror)); 101 102 return (e); 103 } 104