1 /* $NetBSD: gelf_cap.c,v 1.3 2016/02/20 02:43:42 christos Exp $ */ 2 3 /*- 4 * Copyright (c) 2006,2008 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 <sys/cdefs.h> 34 35 #include <assert.h> 36 #include <gelf.h> 37 #include <limits.h> 38 #include <stdint.h> 39 40 #include "_libelf.h" 41 42 __RCSID("$NetBSD: gelf_cap.c,v 1.3 2016/02/20 02:43:42 christos Exp $"); 43 ELFTC_VCSID("Id: gelf_cap.c 3177 2015-03-30 18:19:41Z emaste "); 44 45 GElf_Cap * 46 gelf_getcap(Elf_Data *ed, int ndx, GElf_Cap *dst) 47 { 48 int ec; 49 Elf *e; 50 size_t msz; 51 Elf_Scn *scn; 52 Elf32_Cap *cap32; 53 Elf64_Cap *cap64; 54 uint32_t sh_type; 55 struct _Libelf_Data *d; 56 57 d = (struct _Libelf_Data *) ed; 58 59 if (d == NULL || ndx < 0 || dst == NULL || 60 (scn = d->d_scn) == NULL || 61 (e = scn->s_elf) == NULL) { 62 LIBELF_SET_ERROR(ARGUMENT, 0); 63 return (NULL); 64 } 65 66 ec = e->e_class; 67 assert(ec == ELFCLASS32 || ec == ELFCLASS64); 68 69 if (ec == ELFCLASS32) 70 sh_type = scn->s_shdr.s_shdr32.sh_type; 71 else 72 sh_type = scn->s_shdr.s_shdr64.sh_type; 73 74 if (_libelf_xlate_shtype(sh_type) != ELF_T_CAP) { 75 LIBELF_SET_ERROR(ARGUMENT, 0); 76 return (NULL); 77 } 78 79 msz = _libelf_msize(ELF_T_CAP, ec, e->e_version); 80 81 assert(msz > 0); 82 83 if (msz * (size_t) ndx >= d->d_data.d_size) { 84 LIBELF_SET_ERROR(ARGUMENT, 0); 85 return (NULL); 86 } 87 88 if (ec == ELFCLASS32) { 89 90 cap32 = (Elf32_Cap *) d->d_data.d_buf + ndx; 91 92 dst->c_tag = cap32->c_tag; 93 dst->c_un.c_val = (Elf64_Xword) cap32->c_un.c_val; 94 95 } else { 96 97 cap64 = (Elf64_Cap *) d->d_data.d_buf + ndx; 98 99 *dst = *cap64; 100 } 101 102 return (dst); 103 } 104 105 int 106 gelf_update_cap(Elf_Data *ed, int ndx, GElf_Cap *gc) 107 { 108 int ec; 109 Elf *e; 110 size_t msz; 111 Elf_Scn *scn; 112 Elf32_Cap *cap32; 113 Elf64_Cap *cap64; 114 uint32_t sh_type; 115 struct _Libelf_Data *d; 116 117 d = (struct _Libelf_Data *) ed; 118 119 if (d == NULL || ndx < 0 || gc == NULL || 120 (scn = d->d_scn) == NULL || 121 (e = scn->s_elf) == NULL) { 122 LIBELF_SET_ERROR(ARGUMENT, 0); 123 return (0); 124 } 125 126 ec = e->e_class; 127 assert(ec == ELFCLASS32 || ec == ELFCLASS64); 128 129 if (ec == ELFCLASS32) 130 sh_type = scn->s_shdr.s_shdr32.sh_type; 131 else 132 sh_type = scn->s_shdr.s_shdr64.sh_type; 133 134 if (_libelf_xlate_shtype(sh_type) != ELF_T_CAP) { 135 LIBELF_SET_ERROR(ARGUMENT, 0); 136 return (0); 137 } 138 139 msz = _libelf_msize(ELF_T_CAP, ec, e->e_version); 140 assert(msz > 0); 141 142 if (msz * (size_t) ndx >= d->d_data.d_size) { 143 LIBELF_SET_ERROR(ARGUMENT, 0); 144 return (0); 145 } 146 147 if (ec == ELFCLASS32) { 148 cap32 = (Elf32_Cap *) d->d_data.d_buf + ndx; 149 150 LIBELF_COPY_U32(cap32, gc, c_tag); 151 LIBELF_COPY_U32(cap32, gc, c_un.c_val); 152 } else { 153 cap64 = (Elf64_Cap *) d->d_data.d_buf + ndx; 154 155 *cap64 = *gc; 156 } 157 158 return (1); 159 } 160