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 
load_binary(struct linux_binprm * bprm)9 static 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 
37 static struct linux_binfmt loader_format = {
38 	.load_binary	= load_binary,
39 };
40 
init_loader_binfmt(void)41 static int __init init_loader_binfmt(void)
42 {
43 	insert_binfmt(&loader_format);
44 	return 0;
45 }
46 arch_initcall(init_loader_binfmt);
47