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