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/* Chrysalide - Outil d'analyse de fichiers binaires
* checks.c - validations liées au format DWARF v2
*
* Copyright (C) 2018 Cyrille Bagard
*
* This file is part of Chrysalide.
*
* Chrysalide is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* Chrysalide 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 a copy of the GNU General Public License
* along with Chrysalide. If not, see <http://www.gnu.org/licenses/>.
*/
#include "checks.h"
#include <malloc.h>
#include <stdio.h>
#include <i18n.h>
#include <common/cpp.h>
#include <format/format.h>
#include "core.h"
#include "v2/checks.h"
#include "v3/checks.h"
#include "v4/checks.h"
/**
* Opérations disponibles par version.
*/
/* Procède à la conversion de base d'une abréviation DWARF. */
typedef bool (* check_dwarf_decl_fc) (const dw_abbrev_decl *);
/* Procède à la conversion d'un attribut d'abréviation DWARF. */
typedef bool (* check_dwarf_attrib_fc) (const dw_abbrev_raw_attr *);
typedef struct _abbrev_check_op
{
check_dwarf_decl_fc check_decl; /* Validation des déclarations */
check_dwarf_attrib_fc check_attrib; /* Validation des attributs */
} abbrev_check_op;
static const abbrev_check_op _check_ops[5] = {
[2] = {
.check_decl = (check_dwarf_decl_fc)check_dwarfv2_abbrev_decl,
.check_attrib = (check_dwarf_attrib_fc)check_dwarfv2_abbrev_attrib
},
[3] = {
.check_decl = (check_dwarf_decl_fc)check_dwarfv3_abbrev_decl,
.check_attrib = (check_dwarf_attrib_fc)check_dwarfv3_abbrev_attrib
},
[4] = {
.check_decl = (check_dwarf_decl_fc)check_dwarfv4_abbrev_decl,
.check_attrib = (check_dwarf_attrib_fc)check_dwarfv4_abbrev_attrib
}
};
/******************************************************************************
* *
* Paramètres : format = informations de débogage à consulter. *
* decl = structure brute dont le contenu est à valider. *
* target = version ciblée par le format. *
* pos = emplacement de l'élément à vérifier dans le binaire.*
* *
* Description : Procède à la conversion de base d'une abréviation DWARF. *
* *
* Retour : Validité confirmée ou non. *
* *
* Remarques : - *
* *
******************************************************************************/
bool check_dwarf_abbrev_decl(GDwarfFormat *format, const dw_abbrev_decl *decl, uint16_t target, const vmpa2t *pos)
{
bool result; /* Validité à retourner */
char *msg; /* Message à imprimer */
uint16_t i; /* Boucle de parcours */
VMPA_BUFFER(loc); /* Position humainement lisible*/
result = false;
if (target < 2)
{
asprintf(&msg, _("Too old DWARF compilation unit (%hu < 2) ; fixed!"), target);
g_binary_format_add_error(G_BIN_FORMAT(format), BFE_STRUCTURE, pos, msg);
free(msg);
target = 2;
}
for (i = target; i < ARRAY_SIZE(_check_ops); i++)
{
result = _check_ops[i].check_decl(decl);
if (result)
break;
}
if (result)
{
if (i > target)
{
asprintf(&msg, _("The DWARF abbreviation declaration belongs to another version (%hu vs %hu)"),
i, target);
g_binary_format_add_error(G_BIN_FORMAT(format), BFE_STRUCTURE, pos, msg);
free(msg);
}
}
else
{
vmpa2_phys_to_string(pos, MDS_UNDEFINED, loc, NULL);
log_dwarf_variadic_message(LMT_BAD_BINARY, _("Invalid abbreviation declaration at %s"), loc);
}
return result;
}
/******************************************************************************
* *
* Paramètres : format = informations de débogage à consulter. *
* decl = structure brute dont le contenu est à valider. *
* target = version ciblée par le format. *
* pos = emplacement de l'élément à vérifier dans le binaire.*
* *
* Description : Procède à la conversion d'un attribut d'abréviation DWARF. *
* *
* Retour : Validité confirmée ou non. *
* *
* Remarques : - *
* *
******************************************************************************/
bool check_dwarf_abbrev_attrib(GDwarfFormat *format, const dw_abbrev_raw_attr *attr, uint16_t target, const vmpa2t *pos)
{
bool result; /* Validité à retourner */
char *msg; /* Message à imprimer */
uint16_t i; /* Boucle de parcours */
VMPA_BUFFER(loc); /* Position humainement lisible*/
result = false;
if (target < 2)
{
asprintf(&msg, _("Too old DWARF compilation unit (%hu < 2) ; fixed!"), target);
g_binary_format_add_error(G_BIN_FORMAT(format), BFE_STRUCTURE, pos, msg);
free(msg);
target = 2;
}
for (i = target; i < ARRAY_SIZE(_check_ops); i++)
{
result = _check_ops[i].check_attrib(attr);
if (result)
break;
}
if (result)
{
if (i > target)
{
asprintf(&msg, _("The DWARF abbreviation attribute belongs to another version (%hu vs %hu)"),
i, target);
g_binary_format_add_error(G_BIN_FORMAT(format), BFE_STRUCTURE, pos, msg);
free(msg);
}
}
else
{
vmpa2_phys_to_string(pos, MDS_UNDEFINED, loc, NULL);
log_dwarf_variadic_message(LMT_BAD_BINARY, _("Invalid abbreviation attribute at %s"), loc);
}
return result;
}
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