1 /* 2 * Copyright (c) Christos Zoulas 2008. 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 immediately at the beginning of the file, without modification, 10 * this list of conditions, and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR 19 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 */ 27 if (nbytes <= sizeof(elfhdr)) 28 return 0; 29 30 u.l = 1; 31 (void)memcpy(&elfhdr, buf, sizeof elfhdr); 32 swap = (u.c[sizeof(int32_t) - 1] + 1) != elfhdr.e_ident[EI_DATA]; 33 34 type = elf_getu16(swap, elfhdr.e_type); 35 switch (type) { 36 #ifdef ELFCORE 37 case ET_CORE: 38 phnum = elf_getu16(swap, elfhdr.e_phnum); 39 if (phnum > ms->elf_phnum_max) 40 return toomany(ms, "program", phnum); 41 flags |= FLAGS_IS_CORE; 42 if (dophn_core(ms, clazz, swap, fd, 43 (off_t)elf_getu(swap, elfhdr.e_phoff), phnum, 44 (size_t)elf_getu16(swap, elfhdr.e_phentsize), 45 fsize, &flags) == -1) 46 return -1; 47 break; 48 #endif 49 case ET_EXEC: 50 case ET_DYN: 51 phnum = elf_getu16(swap, elfhdr.e_phnum); 52 if (phnum > ms->elf_phnum_max) 53 return toomany(ms, "program", phnum); 54 shnum = elf_getu16(swap, elfhdr.e_shnum); 55 if (shnum > ms->elf_shnum_max) 56 return toomany(ms, "section", shnum); 57 if (dophn_exec(ms, clazz, swap, fd, 58 (off_t)elf_getu(swap, elfhdr.e_phoff), phnum, 59 (size_t)elf_getu16(swap, elfhdr.e_phentsize), 60 fsize, &flags, shnum) == -1) 61 return -1; 62 /*FALLTHROUGH*/ 63 case ET_REL: 64 shnum = elf_getu16(swap, elfhdr.e_shnum); 65 if (shnum > ms->elf_shnum_max) 66 return toomany(ms, "section", shnum); 67 if (doshn(ms, clazz, swap, fd, 68 (off_t)elf_getu(swap, elfhdr.e_shoff), shnum, 69 (size_t)elf_getu16(swap, elfhdr.e_shentsize), 70 fsize, &flags, elf_getu16(swap, elfhdr.e_machine), 71 (int)elf_getu16(swap, elfhdr.e_shstrndx)) == -1) 72 return -1; 73 break; 74 75 default: 76 break; 77 } 78 return 1; 79