|
Packit Service |
97d2fb |
/* Get note information at the supplied offset.
|
|
Packit Service |
97d2fb |
Copyright (C) 2007, 2014, 2015, 2018 Red Hat, Inc.
|
|
Packit Service |
97d2fb |
This file is part of elfutils.
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
This file is free software; you can redistribute it and/or modify
|
|
Packit Service |
97d2fb |
it under the terms of either
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
* the GNU Lesser General Public License as published by the Free
|
|
Packit Service |
97d2fb |
Software Foundation; either version 3 of the License, or (at
|
|
Packit Service |
97d2fb |
your option) any later version
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
or
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
* the GNU General Public License as published by the Free
|
|
Packit Service |
97d2fb |
Software Foundation; either version 2 of the License, or (at
|
|
Packit Service |
97d2fb |
your option) any later version
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
or both in parallel, as here.
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
elfutils is distributed in the hope that it will be useful, but
|
|
Packit Service |
97d2fb |
WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
Packit Service |
97d2fb |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Packit Service |
97d2fb |
General Public License for more details.
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
You should have received copies of the GNU General Public License and
|
|
Packit Service |
97d2fb |
the GNU Lesser General Public License along with this program. If
|
|
Packit Service |
97d2fb |
not, see <http://www.gnu.org/licenses/>. */
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
#ifdef HAVE_CONFIG_H
|
|
Packit Service |
97d2fb |
# include <config.h>
|
|
Packit Service |
97d2fb |
#endif
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
#include <assert.h>
|
|
Packit Service |
97d2fb |
#include <gelf.h>
|
|
Packit Service |
97d2fb |
#include <string.h>
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
#include "libelfP.h"
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
size_t
|
|
Packit Service |
97d2fb |
gelf_getnote (Elf_Data *data, size_t offset, GElf_Nhdr *result,
|
|
Packit Service |
97d2fb |
size_t *name_offset, size_t *desc_offset)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
if (data == NULL)
|
|
Packit Service |
97d2fb |
return 0;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
if (unlikely (data->d_type != ELF_T_NHDR && data->d_type != ELF_T_NHDR8))
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
__libelf_seterrno (ELF_E_INVALID_HANDLE);
|
|
Packit Service |
97d2fb |
return 0;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* It's easy to handle this type. It has the same size for 32 and
|
|
Packit Service |
97d2fb |
64 bit objects. */
|
|
Packit Service |
97d2fb |
assert (sizeof (GElf_Nhdr) == sizeof (Elf32_Nhdr));
|
|
Packit Service |
97d2fb |
assert (sizeof (GElf_Nhdr) == sizeof (Elf64_Nhdr));
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
rwlock_rdlock (((Elf_Data_Scn *) data)->s->elf->lock);
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* The data is already in the correct form. Just make sure the
|
|
Packit Service |
97d2fb |
offset is OK. */
|
|
Packit Service |
97d2fb |
if (unlikely (offset > data->d_size
|
|
Packit Service |
97d2fb |
|| data->d_size - offset < sizeof (GElf_Nhdr)))
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
__libelf_seterrno (ELF_E_OFFSET_RANGE);
|
|
Packit Service |
97d2fb |
offset = 0;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
else
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
const GElf_Nhdr *n = data->d_buf + offset;
|
|
Packit Service |
97d2fb |
offset += sizeof *n;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
if (offset > data->d_size)
|
|
Packit Service |
97d2fb |
offset = 0;
|
|
Packit Service |
97d2fb |
else
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
/* This is slightly tricky, offset is guaranteed to be 4
|
|
Packit Service |
97d2fb |
byte aligned, which is what we need for the name_offset.
|
|
Packit Service |
97d2fb |
And normally desc_offset is also 4 byte aligned, but not
|
|
Packit Service |
97d2fb |
for GNU Property notes, then it should be 8. So align
|
|
Packit Service |
97d2fb |
the offset, after adding the namesz, and include padding
|
|
Packit Service |
97d2fb |
in descsz to get to the end. */
|
|
Packit Service |
97d2fb |
*name_offset = offset;
|
|
Packit Service |
97d2fb |
if (n->n_namesz > data->d_size
|
|
Packit Service |
97d2fb |
|| offset > data->d_size - n->n_namesz)
|
|
Packit Service |
97d2fb |
offset = 0;
|
|
Packit Service |
97d2fb |
else
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
offset += n->n_namesz;
|
|
Packit Service |
97d2fb |
/* Include padding. Check below for overflow. */
|
|
Packit Service |
97d2fb |
GElf_Word descsz = (data->d_type == ELF_T_NHDR8
|
|
Packit Service |
97d2fb |
? NOTE_ALIGN8 (n->n_descsz)
|
|
Packit Service |
97d2fb |
: NOTE_ALIGN4 (n->n_descsz));
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
if (data->d_type == ELF_T_NHDR8)
|
|
Packit Service |
97d2fb |
offset = NOTE_ALIGN8 (offset);
|
|
Packit Service |
97d2fb |
else
|
|
Packit Service |
97d2fb |
offset = NOTE_ALIGN4 (offset);
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
if (unlikely (offset > data->d_size
|
|
Packit Service |
97d2fb |
|| data->d_size - offset < descsz
|
|
Packit Service |
97d2fb |
|| (descsz == 0 && n->n_descsz != 0)))
|
|
Packit Service |
97d2fb |
offset = 0;
|
|
Packit Service |
97d2fb |
else
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
*desc_offset = offset;
|
|
Packit Service |
97d2fb |
offset += descsz;
|
|
Packit Service |
97d2fb |
*result = *n;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
rwlock_unlock (((Elf_Data_Scn *) data)->s->elf->lock);
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
return offset;
|
|
Packit Service |
97d2fb |
}
|