1 /*- 2 * Copyright (c) 2006,2008 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 <assert.h> 28 #include <gelf.h> 29 30 #include "_libelf.h" 31 32 ELFTC_VCSID("$Id: gelf_symshndx.c 3174 2015-03-27 17:13:41Z emaste $"); 33 34 GElf_Sym * 35 gelf_getsymshndx(Elf_Data *d, Elf_Data *id, int ndx, GElf_Sym *dst, 36 Elf32_Word *shindex) 37 { 38 int ec; 39 Elf *e; 40 size_t msz; 41 Elf_Scn *scn; 42 uint32_t sh_type; 43 struct _Libelf_Data *ld, *lid; 44 45 ld = (struct _Libelf_Data *) d; 46 lid = (struct _Libelf_Data *) id; 47 48 if (gelf_getsym(d, ndx, dst) == 0) 49 return (NULL); 50 51 if (lid == NULL || (scn = lid->d_scn) == NULL || 52 (e = scn->s_elf) == NULL || (e != ld->d_scn->s_elf) || 53 shindex == NULL) { 54 LIBELF_SET_ERROR(ARGUMENT, 0); 55 return (NULL); 56 } 57 58 ec = e->e_class; 59 assert(ec == ELFCLASS32 || ec == ELFCLASS64); 60 61 if (ec == ELFCLASS32) 62 sh_type = scn->s_shdr.s_shdr32.sh_type; 63 else 64 sh_type = scn->s_shdr.s_shdr64.sh_type; 65 66 if (_libelf_xlate_shtype(sh_type) != ELF_T_WORD || 67 id->d_type != ELF_T_WORD) { 68 LIBELF_SET_ERROR(ARGUMENT, 0); 69 return (NULL); 70 } 71 72 msz = _libelf_msize(ELF_T_WORD, ec, e->e_version); 73 74 assert(msz > 0); 75 assert(ndx >= 0); 76 77 if (msz * (size_t) ndx >= id->d_size) { 78 LIBELF_SET_ERROR(ARGUMENT, 0); 79 return (NULL); 80 } 81 82 *shindex = ((Elf32_Word *) id->d_buf)[ndx]; 83 84 return (dst); 85 } 86 87 int 88 gelf_update_symshndx(Elf_Data *d, Elf_Data *id, int ndx, GElf_Sym *gs, 89 Elf32_Word xindex) 90 { 91 int ec; 92 Elf *e; 93 size_t msz; 94 Elf_Scn *scn; 95 uint32_t sh_type; 96 struct _Libelf_Data *ld, *lid; 97 98 ld = (struct _Libelf_Data *) d; 99 lid = (struct _Libelf_Data *) id; 100 101 if (gelf_update_sym(d, ndx, gs) == 0) 102 return (0); 103 104 if (lid == NULL || (scn = lid->d_scn) == NULL || 105 (e = scn->s_elf) == NULL || (e != ld->d_scn->s_elf)) { 106 LIBELF_SET_ERROR(ARGUMENT, 0); 107 return (0); 108 } 109 110 ec = e->e_class; 111 assert(ec == ELFCLASS32 || ec == ELFCLASS64); 112 113 if (ec == ELFCLASS32) 114 sh_type = scn->s_shdr.s_shdr32.sh_type; 115 else 116 sh_type = scn->s_shdr.s_shdr64.sh_type; 117 118 if (_libelf_xlate_shtype(sh_type) != ELF_T_WORD || 119 d->d_type != ELF_T_WORD) { 120 LIBELF_SET_ERROR(ARGUMENT, 0); 121 return (0); 122 } 123 124 msz = _libelf_msize(ELF_T_WORD, ec, e->e_version); 125 126 assert(msz > 0); 127 assert(ndx >= 0); 128 129 if (msz * (size_t) ndx >= id->d_size) { 130 LIBELF_SET_ERROR(ARGUMENT, 0); 131 return (0); 132 } 133 134 *(((Elf32_Word *) id->d_buf) + ndx) = xindex; 135 136 return (1); 137 } 138