int get_ldso_metadata(signed int *binding_offset)
{
ldso_info_t info;
int result;
char filename[MAX_PATH_LEN+1];
find_interp_name();
debug_printf2("Requesting interpreter metadata for %s\n", interp_name);
result = send_ldso_info_request(ldcsid, interp_name, filename);
if (result == -1)
return -1;
read_ldso_metadata(filename, &info);
*binding_offset = info.binding_offset;
return 0;
}
static int try_load_elf(elf_prog_t *prog, long bailout)
{
int err, has_interp;
char i_filename[PATH_MAX]; /* so much easier */
elf_bin_t *bin=&prog->bin, *interp=&prog->interp;
if ( (err = open_elf(prog->filename, bin)) < 0 )
return err;
Elf32_Phdr phdr_bin_tmp[bin->hdr.e_phnum];
bin->phdr = phdr_bin_tmp; /* point to mmapped region later if any */
if (read_at(bin->fd, bin->hdr.e_phoff, bin->phdr,
sizeof(*bin->phdr)*bin->hdr.e_phnum) !=
(long)sizeof(*bin->phdr)*bin->hdr.e_phnum)
return -EIO;
if ( (err = find_interp_name(bin, i_filename, PATH_MAX)) < 0 )
return err;
has_interp = err;
interp->phdr = NULL;
interp->hdr.e_phnum = 0;
if ( has_interp && (err = open_elf(i_filename, interp)) < 0)
return err;
Elf32_Phdr phdr_interp_tmp[interp->hdr.e_phnum];
if ( has_interp )
{
interp->phdr = phdr_interp_tmp; /* point to mmapped region later */
if (read_at(interp->fd, interp->hdr.e_phoff, interp->phdr,
sizeof(*interp->phdr)*interp->hdr.e_phnum) !=
(long)sizeof(*interp->phdr)*interp->hdr.e_phnum)
return -EIO;
}
/* point of no return */
if (bailout)
return 0;
int stack_prot = get_stack_prot(bin);
err = alloc_user_stack(prog, stack_prot);
if ( mmap_binary(bin, 0) & PG_MASK )
raise(SIGKILL);
if ( has_interp && (mmap_binary(interp, 1) & PG_MASK) )
raise(SIGKILL);
/* set up stack */
bin->phdr = mapped_phdr(bin);
if ( has_interp )
interp->phdr = mapped_phdr(interp);
init_user_stack(prog, stack_prot);
if (err & PG_MASK)
raise(SIGKILL);
if (has_interp)
prog->entry = (void *)(interp->base + interp->hdr.e_entry);
else
prog->entry = (void *)(bin->base + bin->hdr.e_entry);
return 0;
}