/**
* @brief Shift relocation tables at some point for allowing non-present symbol resolving
* mostly applied on section injection for ET_DYN objects.
* @param file The host file where shift must happens.
* @param diff Absolute difference to shift to.
* @param relplt Section descriptor for the .relplt section.
* @param limit Upper limit address beyond which shifting must not be performed (or ELFSH_NOLIMIT)
* @return Always 0.
*/
int elfsh_shift_ia32_relocs(elfshobj_t *file,
eresi_Addr diff,
elfshsect_t *relplt,
eresi_Addr limit)
{
elfsh_Rel *l;
int index;
eresi_Addr reloff;
elfshsect_t *parent;
elfsh_SAddr off;
PROFILER_IN(__FILE__, __FUNCTION__, __LINE__);
for (index = 0; index < relplt->shdr->sh_size / sizeof(elfsh_Rel); index++)
{
l = (elfsh_Rel *) relplt->data + index;
if (ELFSH_NOLIMIT == limit || elfsh_get_reloffset((elfsh_Rel *) l) >= limit)
{
reloff = elfsh_get_reloffset((elfsh_Rel *) l);
reloff += diff;
elfsh_set_reloffset((elfsh_Rel *) l, reloff);
/* Shifting memory -pointed- by the relative relocation */
if (elfsh_get_reltype(l) != R_386_RELATIVE)
continue;
parent = elfsh_get_parent_section(file, reloff, &off);
if (strstr(parent->name, "got") || strstr(parent->name, "bss") ||
strstr(parent->name, "elfsh"))
continue;
*(eresi_Addr *) ((char *) parent->data + off) += diff;
}
}
PROFILER_ROUT(__FILE__, __FUNCTION__, __LINE__, 0);
}
/**
* @brief Shift the SPARC relocation to make points the entries inside .alt.plt instead of .plt
* @param file The host file where shift must happens.
* @param diff Absolute difference to shift to.
* @param relplt Section descriptor for the .relplt section.
* @return Always 0.
*/
int elfsh_shift_generic_relocs(elfshobj_t *file,
eresi_Addr diff,
elfshsect_t *relplt)
{
elfsh_Rela *l;
int index;
PROFILER_IN(__FILE__, __FUNCTION__, __LINE__);
for (index = 0; index < relplt->shdr->sh_size / sizeof(elfsh_Rela); index++)
{
l = (elfsh_Rela *) relplt->data + index;
elfsh_set_reloffset((elfsh_Rel *) l, elfsh_get_reloffset((elfsh_Rel *) l) + diff);
}
PROFILER_ROUT(__FILE__, __FUNCTION__, __LINE__, 0);
}
/**
* @brief Shift the ALPHA relocation table.
* @param file The file where to relocate the table.
* @param name Name of symbol for which to relocate entry.
* @param altgot Descriptor for the ALTGOT section.
* @param off
* @return Success (0) or Error (-1).
*/
int elfsh_shift_alpha_relocs(elfshobj_t *file,
char *name,
elfshsect_t *altgot,
u_int off)
{
u_int entsz;
elfsh_Rela *rel;
eresi_Addr addr;
PROFILER_IN(__FILE__, __FUNCTION__, __LINE__);
/* Find the relocation entry */
entsz = elfsh_get_pltentsz(file);
rel = (elfsh_Rela *) elfsh_get_relent_by_name(file, name);
if (rel == NULL)
{
#if __DEBUG_COPYPLT__
printf("[DEBUG_COPYPLT] Did not find relocation entry from symbol %s \n", name);
#endif
PROFILER_ERR(__FILE__, __FUNCTION__, __LINE__,"Unable to get relocation entry", -1);
}
#if __DEBUG_COPYPLT__
else
printf("[DEBUG_COPYPLT] Found relocation entry (" AFMT ") from symbol %s \n",
elfsh_get_reloffset((elfsh_Rel *) rel), name);
#endif
/* Compute the new value */
addr = altgot->shdr->sh_addr + (((off - 8) / entsz) * sizeof(eresi_Addr));
#if __DEBUG_COPYPLT__
printf("[DEBUG_COPYPLT] Setting relocation entry to " AFMT " \n", addr);
#endif
/* Write it */
elfsh_set_reloffset((elfsh_Rel *) rel, addr);
PROFILER_ROUT(__FILE__, __FUNCTION__, __LINE__, 0);
}
void reloc_set_relaoffset(elf_bf_Rela *r, Elf64_Addr off)
{
if (r->rel) {
elfsh_set_reloffset((elfsh_Rel *) r->rel, off);
}
}
