original development tree for Linux kernel GTP module; now long in mainline.
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#include <linux/init.h>
#include <linux/fs.h>
#include <linux/file.h>
#include <linux/mm_types.h>
#include <linux/binfmts.h>
#include <linux/a.out.h>
static int load_binary(struct linux_binprm *bprm, struct pt_regs *regs)
{
struct exec *eh = (struct exec *)bprm->buf;
unsigned long loader;
struct file *file;
int retval;
if (eh->fh.f_magic != 0x183 || (eh->fh.f_flags & 0x3000) != 0x3000)
return -ENOEXEC;
if (bprm->loader)
return -ENOEXEC;
allow_write_access(bprm->file);
fput(bprm->file);
bprm->file = NULL;
loader = bprm->vma->vm_end - sizeof(void *);
file = open_exec("/sbin/loader");
retval = PTR_ERR(file);
if (IS_ERR(file))
return retval;
/* Remember if the application is TASO. */
bprm->taso = eh->ah.entry < 0x100000000UL;
bprm->file = file;
bprm->loader = loader;
retval = prepare_binprm(bprm);
if (retval < 0)
return retval;
return search_binary_handler(bprm,regs);
}
static struct linux_binfmt loader_format = {
.load_binary = load_binary,
};
static int __init init_loader_binfmt(void)
{
insert_binfmt(&loader_format);
return 0;
}
arch_initcall(init_loader_binfmt);