1#include <linux/init.h>
2#include <linux/fs.h>
3#include <linux/file.h>
4#include <linux/mm_types.h>
5#include <linux/binfmts.h>
6#include <linux/a.out.h>
7
8static int load_binary(struct linux_binprm *bprm)
9{
10	struct exec *eh = (struct exec *)bprm->buf;
11	unsigned long loader;
12	struct file *file;
13	int retval;
14
15	if (eh->fh.f_magic != 0x183 || (eh->fh.f_flags & 0x3000) != 0x3000)
16		return -ENOEXEC;
17
18	if (bprm->loader)
19		return -ENOEXEC;
20
21	allow_write_access(bprm->file);
22	fput(bprm->file);
23	bprm->file = NULL;
24
25	loader = bprm->vma->vm_end - sizeof(void *);
26
27	file = open_exec("/sbin/loader");
28	retval = PTR_ERR(file);
29	if (IS_ERR(file))
30		return retval;
31
32	/* Remember if the application is TASO.  */
33	bprm->taso = eh->ah.entry < 0x100000000UL;
34
35	bprm->file = file;
36	bprm->loader = loader;
37	retval = prepare_binprm(bprm);
38	if (retval < 0)
39		return retval;
40	return search_binary_handler(bprm);
41}
42
43static struct linux_binfmt loader_format = {
44	.load_binary	= load_binary,
45};
46
47static int __init init_loader_binfmt(void)
48{
49	insert_binfmt(&loader_format);
50	return 0;
51}
52arch_initcall(init_loader_binfmt);
53