1/* $NetBSD: gelf_cap.c,v 1.5 2024/03/03 17:37:33 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 1.5 2024/03/03 17:37:33 christos Exp $"); 43 44GElf_Cap * 45gelf_getcap(Elf_Data *ed, int ndx, GElf_Cap *dst) 46{ 47 int ec; 48 Elf *e; 49 size_t msz; 50 Elf_Scn *scn; 51 Elf32_Cap *cap32; 52 Elf64_Cap *cap64; 53 uint32_t sh_type; 54 struct _Libelf_Data *d; 55 56 d = (struct _Libelf_Data *) ed; 57 58 if (d == NULL || ndx < 0 || dst == NULL || 59 (scn = d->d_scn) == NULL || 60 (e = scn->s_elf) == NULL) { 61 LIBELF_SET_ERROR(ARGUMENT, 0); 62 return (NULL); 63 } 64 65 ec = e->e_class; 66 assert(ec == ELFCLASS32 || ec == ELFCLASS64); 67 68 if (ec == ELFCLASS32) 69 sh_type = scn->s_shdr.s_shdr32.sh_type; 70 else 71 sh_type = scn->s_shdr.s_shdr64.sh_type; 72 73 if (_libelf_xlate_shtype(sh_type) != ELF_T_CAP) { 74 LIBELF_SET_ERROR(ARGUMENT, 0); 75 return (NULL); 76 } 77 78 if ((msz = _libelf_msize(ELF_T_CAP, ec, e->e_version)) == 0) 79 return (NULL); 80 81 if (msz * (size_t) ndx >= d->d_data.d_size) { 82 LIBELF_SET_ERROR(ARGUMENT, 0); 83 return (NULL); 84 } 85 86 if (ec == ELFCLASS32) { 87 88 cap32 = (Elf32_Cap *) d->d_data.d_buf + ndx; 89 90 dst->c_tag = cap32->c_tag; 91 dst->c_un.c_val = (Elf64_Xword) cap32->c_un.c_val; 92 93 } else { 94 95 cap64 = (Elf64_Cap *) d->d_data.d_buf + ndx; 96 97 *dst = *cap64; 98 } 99 100 return (dst); 101} 102 103int 104gelf_update_cap(Elf_Data *ed, int ndx, GElf_Cap *gc) 105{ 106 int ec; 107 Elf *e; 108 size_t msz; 109 Elf_Scn *scn; 110 Elf32_Cap *cap32; 111 Elf64_Cap *cap64; 112 uint32_t sh_type; 113 struct _Libelf_Data *d; 114 115 d = (struct _Libelf_Data *) ed; 116 117 if (d == NULL || ndx < 0 || gc == NULL || 118 (scn = d->d_scn) == NULL || 119 (e = scn->s_elf) == NULL) { 120 LIBELF_SET_ERROR(ARGUMENT, 0); 121 return (0); 122 } 123 124 ec = e->e_class; 125 assert(ec == ELFCLASS32 || ec == ELFCLASS64); 126 127 if (ec == ELFCLASS32) 128 sh_type = scn->s_shdr.s_shdr32.sh_type; 129 else 130 sh_type = scn->s_shdr.s_shdr64.sh_type; 131 132 if (_libelf_xlate_shtype(sh_type) != ELF_T_CAP) { 133 LIBELF_SET_ERROR(ARGUMENT, 0); 134 return (0); 135 } 136 137 if ((msz = _libelf_msize(ELF_T_CAP, ec, e->e_version)) == 0) 138 return (0); 139 140 if (msz * (size_t) ndx >= d->d_data.d_size) { 141 LIBELF_SET_ERROR(ARGUMENT, 0); 142 return (0); 143 } 144 145 if (ec == ELFCLASS32) { 146 cap32 = (Elf32_Cap *) d->d_data.d_buf + ndx; 147 148 LIBELF_COPY_U32(cap32, gc, c_tag); 149 LIBELF_COPY_U32(cap32, gc, c_un.c_val); 150 } else { 151 cap64 = (Elf64_Cap *) d->d_data.d_buf + ndx; 152 153 *cap64 = *gc; 154 } 155 156 return (1); 157} 158