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 notecount = ms->elf_notes_max; 36 switch (type) { 37 #ifdef ELFCORE 38 case ET_CORE: 39 phnum = elf_getu16(swap, elfhdr.e_phnum); 40 if (phnum > ms->elf_phnum_max) 41 return toomany(ms, "program headers", phnum); 42 flags |= FLAGS_IS_CORE; 43 if (dophn_core(ms, clazz, swap, fd, 44 (off_t)elf_getu(swap, elfhdr.e_phoff), phnum, 45 (size_t)elf_getu16(swap, elfhdr.e_phentsize), 46 fsize, &flags, ¬ecount) == -1) 47 return -1; 48 break; 49 #endif 50 case ET_EXEC: 51 case ET_DYN: 52 phnum = elf_getu16(swap, elfhdr.e_phnum); 53 if (phnum > ms->elf_phnum_max) 54 return toomany(ms, "program", phnum); 55 shnum = elf_getu16(swap, elfhdr.e_shnum); 56 if (shnum > ms->elf_shnum_max) 57 return toomany(ms, "section", shnum); 58 if (dophn_exec(ms, clazz, swap, fd, 59 (off_t)elf_getu(swap, elfhdr.e_phoff), phnum, 60 (size_t)elf_getu16(swap, elfhdr.e_phentsize), 61 fsize, shnum, &flags, ¬ecount) == -1) 62 return -1; 63 /*FALLTHROUGH*/ 64 case ET_REL: 65 shnum = elf_getu16(swap, elfhdr.e_shnum); 66 if (shnum > ms->elf_shnum_max) 67 return toomany(ms, "section headers", shnum); 68 if (doshn(ms, clazz, swap, fd, 69 (off_t)elf_getu(swap, elfhdr.e_shoff), shnum, 70 (size_t)elf_getu16(swap, elfhdr.e_shentsize), 71 fsize, elf_getu16(swap, elfhdr.e_machine), 72 (int)elf_getu16(swap, elfhdr.e_shstrndx), 73 &flags, ¬ecount) == -1) 74 return -1; 75 break; 76 77 default: 78 break; 79 } 80 if (notecount == 0) 81 return toomany(ms, "notes", ms->elf_notes_max); 82 return 1; 83