| /* Get note information at the supplied offset. |
| Copyright (C) 2007, 2014 Red Hat, Inc. |
| This file is part of elfutils. |
| |
| This file is free software; you can redistribute it and/or modify |
| it under the terms of either |
| |
| * the GNU Lesser General Public License as published by the Free |
| Software Foundation; either version 3 of the License, or (at |
| your option) any later version |
| |
| or |
| |
| * the GNU General Public License as published by the Free |
| Software Foundation; either version 2 of the License, or (at |
| your option) any later version |
| |
| or both in parallel, as here. |
| |
| elfutils is distributed in the hope that it will be useful, but |
| WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| General Public License for more details. |
| |
| You should have received copies of the GNU General Public License and |
| the GNU Lesser General Public License along with this program. If |
| not, see <http://www.gnu.org/licenses/>. */ |
| |
| #ifdef HAVE_CONFIG_H |
| # include <config.h> |
| #endif |
| |
| #include <assert.h> |
| #include <gelf.h> |
| #include <string.h> |
| |
| #include "libelfP.h" |
| |
| size_t |
| gelf_getnote (data, offset, result, name_offset, desc_offset) |
| Elf_Data *data; |
| size_t offset; |
| GElf_Nhdr *result; |
| size_t *name_offset; |
| size_t *desc_offset; |
| { |
| if (data == NULL) |
| return 0; |
| |
| if (unlikely (data->d_type != ELF_T_NHDR)) |
| { |
| __libelf_seterrno (ELF_E_INVALID_HANDLE); |
| return 0; |
| } |
| |
| /* It's easy to handle this type. It has the same size for 32 and |
| 64 bit objects. */ |
| assert (sizeof (GElf_Nhdr) == sizeof (Elf32_Nhdr)); |
| assert (sizeof (GElf_Nhdr) == sizeof (Elf64_Nhdr)); |
| |
| rwlock_rdlock (((Elf_Data_Scn *) data)->s->elf->lock); |
| |
| /* The data is already in the correct form. Just make sure the |
| offset is OK. */ |
| if (unlikely (offset > data->d_size |
| || data->d_size - offset < sizeof (GElf_Nhdr))) |
| { |
| __libelf_seterrno (ELF_E_OFFSET_RANGE); |
| offset = 0; |
| } |
| else |
| { |
| const GElf_Nhdr *n = data->d_buf + offset; |
| offset += sizeof *n; |
| |
| /* Include padding. Check below for overflow. */ |
| GElf_Word namesz = NOTE_ALIGN (n->n_namesz); |
| GElf_Word descsz = NOTE_ALIGN (n->n_descsz); |
| |
| if (unlikely (offset > data->d_size |
| || data->d_size - offset < namesz |
| || (namesz == 0 && n->n_namesz != 0))) |
| offset = 0; |
| else |
| { |
| *name_offset = offset; |
| offset += namesz; |
| if (unlikely (offset > data->d_size |
| || data->d_size - offset < descsz |
| || (descsz == 0 && n->n_descsz != 0))) |
| offset = 0; |
| else |
| { |
| *desc_offset = offset; |
| offset += descsz; |
| *result = *n; |
| } |
| } |
| } |
| |
| rwlock_unlock (((Elf_Data_Scn *) data)->s->elf->lock); |
| |
| return offset; |
| } |