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/* Chrysalide - Outil d'analyse de fichiers binaires
* program.c - annotation des en-têtes de programme de binaires ELF
*
* Copyright (C) 2015-2018 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 "program.h"
#include <string.h>
#include <i18n.h>
#include <common/cpp.h>
#include <common/extstr.h>
#include <plugins/elf/elf-int.h>
#include <plugins/fmtp/parser.h>
/* Définition des champs */
static field_desc_switch _elf_prgm_types[] = {
{ .fixed = PT_NULL, .desc = __("Segment type: unused") },
{ .fixed = PT_LOAD, .desc = __("Segment type: loadable program segment") },
{ .fixed = PT_DYNAMIC, .desc = __("Segment type: dynamic linking information") },
{ .fixed = PT_INTERP, .desc = __("Segment type: program interpreter") },
{ .fixed = PT_NOTE, .desc = __("Segment type: auxiliary information") },
{ .fixed = PT_SHLIB, .desc = __("Segment type: reserved") },
{ .fixed = PT_PHDR, .desc = __("Segment type: entry for header table itself") },
{ .fixed = PT_TLS, .desc = __("Segment type: thread-local storage segment") },
{ .fixed = PT_GNU_EH_FRAME, .desc = __("Segment type: GCC .eh_frame_hdr segment") },
{ .fixed = PT_GNU_STACK, .desc = __("Segment type: indicates stack executability") },
{ .fixed = PT_GNU_RELRO, .desc = __("Segment type: read-only after relocation") },
{ .fixed = PT_SUNWSTACK, .desc = __("Segment type: Sun Stack segment") },
{ .lower = PT_LOSUNW, .upper = PT_HISUNW, .desc = __("Segment type: Sun specific segment") },
{ .lower = PT_LOOS, .upper = PT_HIOS, .desc = __("Segment type: OS-specific") },
{ .lower = PT_LOPROC, .upper = PT_HIPROC, .desc = __("Segment type: processor-specific") }
};
static fmt_field_def _elf_phdr_base[] = {
{
.name = "p_type",
.size = MDS_32_BITS,
.repeat = 1,
SWITCH_COMMENT(_elf_prgm_types, __("Segment type: unknown"))
}
};
static fmt_field_def _elf_phdr_32b_a[] = {
{
.name = "p_offset",
.size = MDS_32_BITS,
.repeat = 1,
PLAIN_COMMENT(__("Segment file offset"))
},
{
.name = "p_vaddr",
.size = MDS_32_BITS,
.repeat = 1,
PLAIN_COMMENT(__("Segment virtual address"))
},
{
.name = "p_paddr",
.size = MDS_32_BITS,
.repeat = 1,
PLAIN_COMMENT(__("Segment physical address"))
},
{
.name = "p_filesz",
.size = MDS_32_BITS,
.repeat = 1,
PLAIN_COMMENT(__("Segment size in file"))
},
{
.name = "p_memsz",
.size = MDS_32_BITS,
.repeat = 1,
PLAIN_COMMENT(__("Segment size in memory"))
}
};
static fmt_field_def _elf_phdr_32b_b[] = {
{
.name = "p_align",
.size = MDS_32_BITS,
.repeat = 1,
PLAIN_COMMENT(__("Segment alignment"))
}
};
static fmt_field_def _elf_phdr_64b[] = {
{
.name = "p_offset",
.size = MDS_64_BITS,
.repeat = 1,
PLAIN_COMMENT(__("Segment file offset"))
},
{
.name = "p_vaddr",
.size = MDS_64_BITS,
.repeat = 1,
PLAIN_COMMENT(__("Segment virtual address"))
},
{
.name = "p_paddr",
.size = MDS_64_BITS,
.repeat = 1,
PLAIN_COMMENT(__("Segment physical address"))
},
{
.name = "p_filesz",
.size = MDS_64_BITS,
.repeat = 1,
PLAIN_COMMENT(__("Segment size in file"))
},
{
.name = "p_memsz",
.size = MDS_64_BITS,
.repeat = 1,
PLAIN_COMMENT(__("Segment size in memory"))
},
{
.name = "p_align",
.size = MDS_64_BITS,
.repeat = 1,
PLAIN_COMMENT(__("Segment alignment"))
}
};
/* Charge tous les symboles liés à un en-tête de programme ELF. */
static bool annotate_elf_program_header(GElfFormat *, GPreloadInfo *, SourceEndian, vmpa2t *);
/******************************************************************************
* *
* Paramètres : format = description de l'exécutable à compléter. *
* info = informations à constituer en avance de phase. *
* endian = boutisme présentement utilisé. *
* pos = tête de lecture à déplacer. [OUT] *
* *
* Description : Charge tous les symboles liés à un en-tête de programme ELF. *
* *
* Retour : Bilan de l'opération. *
* *
* Remarques : - *
* *
******************************************************************************/
static bool annotate_elf_program_header(GElfFormat *format, GPreloadInfo *info, SourceEndian endian, vmpa2t *pos)
{
bool result; /* Bilan à retourner */
elf_phdr phdr; /* En-tête de programme ELF */
fmt_field_def flags_field; /* Définition des drapeaux */
char *rights; /* Reconstruction dynamique */
comment_part parts[2]; /* Mise en place des parties */
GBinFormat *bformat; /* Autre version du format */
result = read_elf_program_header(format, get_phy_addr(pos), &phdr);
if (!result)
goto aeph_exit;
/* Préparation de la partie des drapeaux */
memset(&flags_field, 0, sizeof(flags_field));
flags_field.name = "p_flags";
flags_field.size = MDS_32_BITS;
flags_field.repeat = 1;
rights = NULL;
if (ELF_PHDR(format, phdr, p_flags) & PF_R)
rights = stradd(rights, "R");
if (ELF_PHDR(format, phdr, p_flags) & PF_W)
rights = stradd(rights, "W");
if (ELF_PHDR(format, phdr, p_flags) & PF_X)
rights = stradd(rights, "X");
if (ELF_PHDR(format, phdr, p_flags) & PF_MASKOS)
rights = stradd(rights, "o");
if (ELF_PHDR(format, phdr, p_flags) & PF_MASKPROC)
rights = stradd(rights, "p");
if (rights == NULL)
{
flags_field.ctype = FCT_PLAIN;
flags_field.comment.plain = __("Segment flags: none");
}
else
{
parts[0].is_static = true;
parts[0].avoid_i18n = false;
parts[0].static_text = __("Segment flags: ");
parts[1].is_static = false;
parts[1].avoid_i18n = true;
parts[1].dynamic_text = rights;
flags_field.ctype = FCT_MULTI;
flags_field.comment.parts = parts;
flags_field.comment.pcount = ARRAY_SIZE(parts);
}
/* Interprétation générale */
bformat = G_BIN_FORMAT(format);
result = parse_field_definitions(PARSING_DEFS(_elf_phdr_base), bformat, info, pos, NULL);
if (format->is_32b)
{
if (result)
result = parse_field_definitions(PARSING_DEFS(_elf_phdr_32b_a), bformat, info, pos, NULL);
if (result)
result = parse_field_definitions(&flags_field, 1, bformat, info, pos, NULL);
if (result)
result = parse_field_definitions(PARSING_DEFS(_elf_phdr_32b_b), bformat, info, pos, NULL);
}
else
{
if (result)
result = parse_field_definitions(&flags_field, 1, bformat, info, pos, NULL);
if (result)
result = parse_field_definitions(PARSING_DEFS(_elf_phdr_64b), bformat, info, pos, NULL);
}
aeph_exit:
return result;
}
/******************************************************************************
* *
* Paramètres : format = description de l'exécutable à compléter. *
* info = informations à constituer en avance de phase. *
* status = barre de statut à tenir informée. *
* *
* Description : Charge tous les symboles liés aux en-têtes de programme ELF. *
* *
* Retour : Bilan de l'opération. *
* *
* Remarques : - *
* *
******************************************************************************/
bool annotate_elf_program_header_table(GElfFormat *format, GPreloadInfo *info, GtkStatusStack *status)
{
bool result; /* Bilan à retourner */
const elf_header *header; /* En-tête principale */
SourceEndian endian; /* Boutisme utilisé */
phys_t offset; /* Tête de lecture du bbinaire */
vmpa2t pos; /* Localisation des symboles */
uint16_t e_phnum; /* Nombre d'éléments 'Program' */
activity_id_t msg; /* Message de progression */
uint16_t i; /* Boucle de parcours */
result = true;
header = g_elf_format_get_header(format);
endian = g_binary_format_get_endianness(G_BIN_FORMAT(format));
offset = ELF_HDR(format, *header, e_phoff);
if (!g_exe_format_translate_offset_into_vmpa(G_EXE_FORMAT(format), offset, &pos))
return false;
e_phnum = ELF_HDR(format, *header, e_phnum);
msg = gtk_status_stack_add_activity(status, _("Writing annotations for all Elf program headers..."), e_phnum);
for (i = 0; i < e_phnum && result; i++)
{
result = annotate_elf_program_header(format, info, endian, &pos);
gtk_status_stack_update_activity_value(status, msg, 1);
}
gtk_status_stack_remove_activity(status, msg);
return result;
}
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