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/arch/alpha/kernel/binfmt_loader.c

http://github.com/mirrors/linux
C | 53 lines | 41 code | 10 blank | 2 comment | 7 complexity | 088dc7a0db12e7bf5447b2f4f6129983 MD5 | raw file
 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	allow_write_access(bprm->file);
23	fput(bprm->file);
24	bprm->file = NULL;
25
26	loader = bprm->vma->vm_end - sizeof(void *);
27
28	file = open_exec("/sbin/loader");
29	retval = PTR_ERR(file);
30	if (IS_ERR(file))
31		return retval;
32
33	/* Remember if the application is TASO.  */
34	bprm->taso = eh->ah.entry < 0x100000000UL;
35
36	bprm->file = file;
37	bprm->loader = loader;
38	retval = prepare_binprm(bprm);
39	if (retval < 0)
40		return retval;
41	return search_binary_handler(bprm);
42}
43
44static struct linux_binfmt loader_format = {
45	.load_binary	= load_binary,
46};
47
48static int __init init_loader_binfmt(void)
49{
50	insert_binfmt(&loader_format);
51	return 0;
52}
53arch_initcall(init_loader_binfmt);