1// SPDX-License-Identifier: GPL-2.0
 2#include <linux/init.h>
 3#include <linux/fs.h>
 4#include <linux/file.h>
 5#include <linux/mm_types.h>
 6#include <linux/binfmts.h>
 7#include <linux/a.out.h>
 8
 9static int load_binary(struct linux_binprm *bprm)
10{
11	struct exec *eh = (struct exec *)bprm->buf;
12	unsigned long loader;
13	struct file *file;
14	int retval;
15
16	if (eh->fh.f_magic != 0x183 || (eh->fh.f_flags & 0x3000) != 0x3000)
17		return -ENOEXEC;
18
19	if (bprm->loader)
20		return -ENOEXEC;
21
22	loader = bprm->vma->vm_end - sizeof(void *);
23
24	file = open_exec("/sbin/loader");
25	retval = PTR_ERR(file);
26	if (IS_ERR(file))
27		return retval;
28
29	/* Remember if the application is TASO.  */
30	bprm->taso = eh->ah.entry < 0x100000000UL;
31
32	bprm->interpreter = file;
33	bprm->loader = loader;
34	return 0;
35}
36
37static struct linux_binfmt loader_format = {
38	.load_binary	= load_binary,
39};
40
41static int __init init_loader_binfmt(void)
42{
43	insert_binfmt(&loader_format);
44	return 0;
45}
46arch_initcall(init_loader_binfmt);