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 #include <limits.h> 30 #include <stdint.h> 31 32 #include "_libelf.h" 33 34 ELFTC_VCSID("$Id: gelf_cap.c 3732 2019-04-22 11:08:38Z jkoshy $"); 35 36 GElf_Cap * 37 gelf_getcap(Elf_Data *ed, int ndx, GElf_Cap *dst) 38 { 39 int ec; 40 Elf *e; 41 size_t msz; 42 Elf_Scn *scn; 43 Elf32_Cap *cap32; 44 Elf64_Cap *cap64; 45 uint32_t sh_type; 46 struct _Libelf_Data *d; 47 48 d = (struct _Libelf_Data *) ed; 49 50 if (d == NULL || ndx < 0 || dst == NULL || 51 (scn = d->d_scn) == NULL || 52 (e = scn->s_elf) == NULL) { 53 LIBELF_SET_ERROR(ARGUMENT, 0); 54 return (NULL); 55 } 56 57 ec = e->e_class; 58 assert(ec == ELFCLASS32 || ec == ELFCLASS64); 59 60 if (ec == ELFCLASS32) 61 sh_type = scn->s_shdr.s_shdr32.sh_type; 62 else 63 sh_type = scn->s_shdr.s_shdr64.sh_type; 64 65 if (_libelf_xlate_shtype(sh_type) != ELF_T_CAP) { 66 LIBELF_SET_ERROR(ARGUMENT, 0); 67 return (NULL); 68 } 69 70 if ((msz = _libelf_msize(ELF_T_CAP, ec, e->e_version)) == 0) 71 return (NULL); 72 73 if (msz * (size_t) ndx >= d->d_data.d_size) { 74 LIBELF_SET_ERROR(ARGUMENT, 0); 75 return (NULL); 76 } 77 78 if (ec == ELFCLASS32) { 79 80 cap32 = (Elf32_Cap *) d->d_data.d_buf + ndx; 81 82 dst->c_tag = cap32->c_tag; 83 dst->c_un.c_val = (Elf64_Xword) cap32->c_un.c_val; 84 85 } else { 86 87 cap64 = (Elf64_Cap *) d->d_data.d_buf + ndx; 88 89 *dst = *cap64; 90 } 91 92 return (dst); 93 } 94 95 int 96 gelf_update_cap(Elf_Data *ed, int ndx, GElf_Cap *gc) 97 { 98 int ec; 99 Elf *e; 100 size_t msz; 101 Elf_Scn *scn; 102 Elf32_Cap *cap32; 103 Elf64_Cap *cap64; 104 uint32_t sh_type; 105 struct _Libelf_Data *d; 106 107 d = (struct _Libelf_Data *) ed; 108 109 if (d == NULL || ndx < 0 || gc == NULL || 110 (scn = d->d_scn) == NULL || 111 (e = scn->s_elf) == NULL) { 112 LIBELF_SET_ERROR(ARGUMENT, 0); 113 return (0); 114 } 115 116 ec = e->e_class; 117 assert(ec == ELFCLASS32 || ec == ELFCLASS64); 118 119 if (ec == ELFCLASS32) 120 sh_type = scn->s_shdr.s_shdr32.sh_type; 121 else 122 sh_type = scn->s_shdr.s_shdr64.sh_type; 123 124 if (_libelf_xlate_shtype(sh_type) != ELF_T_CAP) { 125 LIBELF_SET_ERROR(ARGUMENT, 0); 126 return (0); 127 } 128 129 if ((msz = _libelf_msize(ELF_T_CAP, ec, e->e_version)) == 0) 130 return (0); 131 132 if (msz * (size_t) ndx >= d->d_data.d_size) { 133 LIBELF_SET_ERROR(ARGUMENT, 0); 134 return (0); 135 } 136 137 if (ec == ELFCLASS32) { 138 cap32 = (Elf32_Cap *) d->d_data.d_buf + ndx; 139 140 LIBELF_COPY_U32(cap32, gc, c_tag); 141 LIBELF_COPY_U32(cap32, gc, c_un.c_val); 142 } else { 143 cap64 = (Elf64_Cap *) d->d_data.d_buf + ndx; 144 145 *cap64 = *gc; 146 } 147 148 return (1); 149 } 150