/**
* Get DTORS entry by name
* @param file
* @param name
* @return
*/
eresi_Addr *elfsh_get_dtors_entry_by_name(elfshobj_t *file, char *name)
{
elfsh_Sym *sym;
eresi_Addr *dtors;
int nbr;
u_int idx;
PROFILER_IN(__FILE__, __FUNCTION__, __LINE__);
/* Sanity checks */
if (file == NULL || name == NULL)
PROFILER_ERR(__FILE__, __FUNCTION__, __LINE__,
"Invalid NULL parameter", NULL);
dtors = elfsh_get_dtors(file, &nbr);
sym = elfsh_get_metasym_by_name(file, name);
if (sym == NULL || dtors == NULL)
PROFILER_ERR(__FILE__, __FUNCTION__, __LINE__,
"Unable to get DTORS entry by name", NULL);
/* Find the entry */
for (idx = 0; idx < nbr; idx++)
if (dtors[idx] == sym->st_value)
PROFILER_ROUT(__FILE__, __FUNCTION__, __LINE__, (dtors + idx));
PROFILER_ERR(__FILE__, __FUNCTION__, __LINE__,
"DTORS entry not found", NULL);
}
/**
* Modify a DTORS entry
* @param file
* @param index
* @param addr
* @return
*/
int elfsh_set_dtors_entry_by_index(elfshobj_t *file,
int index, eresi_Addr addr)
{
int nbr;
eresi_Addr *dtors;
u_int size;
PROFILER_IN(__FILE__, __FUNCTION__, __LINE__);
dtors = elfsh_get_dtors(file, &nbr);
if (NULL == dtors)
PROFILER_ERR(__FILE__, __FUNCTION__, __LINE__,
"Unable to get DTORS entry", -1);
size = file->secthash[ELFSH_SECTION_DTORS]->shdr->sh_size / sizeof(eresi_Addr);
if (index >= size)
PROFILER_ERR(__FILE__, __FUNCTION__, __LINE__,
"DTORS index too big", -1);
dtors[index] = addr;
PROFILER_ROUT(__FILE__, __FUNCTION__, __LINE__, 0);
}
/**
* Load all the part of the binary.
* This function should not be used by e2dbg
* @param file
* @return
*/
int elfsh_read_obj(elfshobj_t *file)
{
elfshsect_t *actual;
int index;
PROFILER_IN(__FILE__, __FUNCTION__, __LINE__);
if (file->read)
PROFILER_ROUT(__FILE__, __FUNCTION__, __LINE__, 0);
if (file->sht == NULL && NULL == elfsh_get_sht(file, NULL))
PROFILER_ERR(__FILE__, __FUNCTION__, __LINE__,
"Unable to grab SHT", -1);
if (NULL == elfsh_get_pht(file, NULL) && file->hdr->e_type != ET_REL)
PROFILER_ERR(__FILE__, __FUNCTION__, __LINE__,
"Unable to grab PHT", -1);
#if __DEBUG_MAP__
puts("[DEBUG:read_obj] Loading all known typed sections\n");
#endif
/* Fill multiple relocation sections */
for (index = 0; NULL !=
(actual = elfsh_get_reloc(file, index, NULL));
index++);
/*
** Load sections placed after symtab
** Added for Solaris
*/
elfsh_get_comments(file);
elfsh_get_dwarf(file);
elfsh_get_stab(file, NULL);
if (file->hdr->e_type == ET_CORE)
{
elfsh_get_core_notes(file);
goto out;
}
/*
** We cannot use simply elfsh_get_anonymous_section() here
** because the object's section hash ptrs would not be filled.
*/
elfsh_get_symtab(file, NULL);
/* Fixup stuffs in the SHT */
elfsh_fixup(file);
elfsh_get_dynsymtab(file, NULL);
elfsh_get_stab(file, NULL);
elfsh_get_dynamic(file, NULL);
elfsh_get_ctors(file, NULL);
elfsh_get_dtors(file, NULL);
elfsh_get_got(file, NULL);
elfsh_get_interp(file);
elfsh_get_versymtab(file, NULL);
elfsh_get_verneedtab(file, NULL);
elfsh_get_verdeftab(file, NULL);
elfsh_get_hashtable(file, NULL);
//elfsh_get_comments(file);
elfsh_get_plt(file, NULL);
/* Fill the multiple notes sections */
for (index = 0; NULL != elfsh_get_notes(file, index); index++);
/* Loop on the section header table and load all unknown-typed sections */
for (actual = file->sectlist; actual; actual = actual->next)
{
/* Fix first section size */
if (actual->shdr->sh_size == 0 && actual->next &&
actual->next->shdr->sh_offset != actual->shdr->sh_offset &&
actual->next->shdr->sh_addr != actual->shdr->sh_addr)
actual->shdr->sh_size =
actual->next->shdr->sh_offset - actual->shdr->sh_offset;
/* If the section data has to be loaded, load it */
/* In case of bss, only load if BSS data is inserted in the file */
if (actual->data == NULL && actual->shdr->sh_size)
{
if ((actual->shdr->sh_type == SHT_NOBITS &&
actual->shdr->sh_offset == actual->next->shdr->sh_offset) ||
(actual->next != NULL && actual->next->shdr->sh_offset == actual->shdr->sh_offset))
continue;
#if __DEBUG_MAP__
printf("[LIBELFSH] Loading anonymous section %15s \n",
elfsh_get_section_name(file, actual));
#endif
elfsh_get_anonymous_section(file, actual);
}
}
/* Fixup various symbols like dynamic ones that are NULL */
/* Non fatal error */
if (file->secthash[ELFSH_SECTION_DYNSYM])
elfsh_fixup_dynsymtab(file->secthash[ELFSH_SECTION_DYNSYM]);
out:
/* We close the file descriptor after file mapping so we can open more files */
if (file->fd >= 0) {
#if __DEBUG_MAP__
printf("[LIBELFSH] Closing descriptor %d \n",
file->fd);
#endif
XCLOSE(file->fd, -1);
/* neutralize file descriptor */
file->fd = -1;
}
PROFILER_ROUT(__FILE__, __FUNCTION__, __LINE__, 0);
}
