[linux.git] / fs / binfmt_aout.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 *  linux/fs/binfmt_aout.c
 *
 *  Copyright (C) 1991, 1992, 1996  Linus Torvalds
 */

#include <linux/module.h>

#include <linux/time.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/mman.h>
#include <linux/a.out.h>
#include <linux/errno.h>
#include <linux/signal.h>
#include <linux/string.h>
#include <linux/fs.h>
#include <linux/file.h>
#include <linux/stat.h>
#include <linux/fcntl.h>
#include <linux/ptrace.h>
#include <linux/user.h>
#include <linux/binfmts.h>
#include <linux/personality.h>
#include <linux/init.h>
#include <linux/coredump.h>
#include <linux/slab.h>
#include <linux/sched/task_stack.h>

#include <linux/uaccess.h>
#include <asm/cacheflush.h>

static int load_aout_binary(struct linux_binprm *);
static int load_aout_library(struct file*);

static struct linux_binfmt aout_format = {
	.module		= THIS_MODULE,
	.load_binary	= load_aout_binary,
	.load_shlib	= load_aout_library,
};

#define BAD_ADDR(x)	((unsigned long)(x) >= TASK_SIZE)

static int set_brk(unsigned long start, unsigned long end)
{
	start = PAGE_ALIGN(start);
	end = PAGE_ALIGN(end);
	if (end > start)
		return vm_brk(start, end - start);
	return 0;
}

/*
 * create_aout_tables() parses the env- and arg-strings in new user
 * memory and creates the pointer tables from them, and puts their
 * addresses on the "stack", returning the new stack pointer value.
 */
static unsigned long __user *create_aout_tables(char __user *p, struct linux_binprm * bprm)
{
	char __user * __user *argv;
	char __user * __user *envp;
	unsigned long __user *sp;
	int argc = bprm->argc;
	int envc = bprm->envc;

	sp = (void __user *)((-(unsigned long)sizeof(char *)) & (unsigned long) p);
#ifdef __alpha__
/* whee.. test-programs are so much fun. */
	put_user(0, --sp);
	put_user(0, --sp);
	if (bprm->loader) {
		put_user(0, --sp);
		put_user(1003, --sp);
		put_user(bprm->loader, --sp);
		put_user(1002, --sp);
	}
	put_user(bprm->exec, --sp);
	put_user(1001, --sp);
#endif
	sp -= envc+1;
	envp = (char __user * __user *) sp;
	sp -= argc+1;
	argv = (char __user * __user *) sp;
#ifndef __alpha__
	put_user((unsigned long) envp,--sp);
	put_user((unsigned long) argv,--sp);
#endif
	put_user(argc,--sp);
	current->mm->arg_start = (unsigned long) p;
	while (argc-->0) {
		char c;
		put_user(p,argv++);
		do {
			get_user(c,p++);
		} while (c);
	}
	put_user(NULL,argv);
	current->mm->arg_end = current->mm->env_start = (unsigned long) p;
	while (envc-->0) {
		char c;
		put_user(p,envp++);
		do {
			get_user(c,p++);
		} while (c);
	}
	put_user(NULL,envp);
	current->mm->env_end = (unsigned long) p;
	return sp;
}

/*
 * These are the functions used to load a.out style executables and shared
 * libraries.  There is no binary dependent code anywhere else.
 */

static int load_aout_binary(struct linux_binprm * bprm)
{
	struct pt_regs *regs = current_pt_regs();
	struct exec ex;
	unsigned long error;
	unsigned long fd_offset;
	unsigned long rlim;
	int retval;

	ex = *((struct exec *) bprm->buf);		/* exec-header */
	if ((N_MAGIC(ex) != ZMAGIC && N_MAGIC(ex) != OMAGIC &&
	     N_MAGIC(ex) != QMAGIC && N_MAGIC(ex) != NMAGIC) ||
	    N_TRSIZE(ex) || N_DRSIZE(ex) ||
	    i_size_read(file_inode(bprm->file)) < ex.a_text+ex.a_data+N_SYMSIZE(ex)+N_TXTOFF(ex)) {
		return -ENOEXEC;
	}

	/*
	 * Requires a mmap handler. This prevents people from using a.out
	 * as part of an exploit attack against /proc-related vulnerabilities.
	 */
	if (!bprm->file->f_op->mmap)
		return -ENOEXEC;

	fd_offset = N_TXTOFF(ex);

	/* Check initial limits. This avoids letting people circumvent
	 * size limits imposed on them by creating programs with large
	 * arrays in the data or bss.
	 */
	rlim = rlimit(RLIMIT_DATA);
	if (rlim >= RLIM_INFINITY)
		rlim = ~0;
	if (ex.a_data + ex.a_bss > rlim)
		return -ENOMEM;

	/* Flush all traces of the currently running executable */
	retval = begin_new_exec(bprm);
	if (retval)
		return retval;

	/* OK, This is the point of no return */
#ifdef __alpha__
	SET_AOUT_PERSONALITY(bprm, ex);
#else
	set_personality(PER_LINUX);
#endif
	setup_new_exec(bprm);

	current->mm->end_code = ex.a_text +
		(current->mm->start_code = N_TXTADDR(ex));
	current->mm->end_data = ex.a_data +
		(current->mm->start_data = N_DATADDR(ex));
	current->mm->brk = ex.a_bss +
		(current->mm->start_brk = N_BSSADDR(ex));

	retval = setup_arg_pages(bprm, STACK_TOP, EXSTACK_DEFAULT);
	if (retval < 0)
		return retval;


	if (N_MAGIC(ex) == OMAGIC) {
		unsigned long text_addr, map_size;
		loff_t pos;

		text_addr = N_TXTADDR(ex);

#ifdef __alpha__
		pos = fd_offset;
		map_size = ex.a_text+ex.a_data + PAGE_SIZE - 1;
#else
		pos = 32;
		map_size = ex.a_text+ex.a_data;
#endif
		error = vm_brk(text_addr & PAGE_MASK, map_size);
		if (error)
			return error;

		error = read_code(bprm->file, text_addr, pos,
				  ex.a_text+ex.a_data);
		if ((signed long)error < 0)
			return error;
	} else {
		if ((ex.a_text & 0xfff || ex.a_data & 0xfff) &&
		    (N_MAGIC(ex) != NMAGIC) && printk_ratelimit())
		{
			printk(KERN_NOTICE "executable not page aligned\n");
		}

		if ((fd_offset & ~PAGE_MASK) != 0 && printk_ratelimit())
		{
			printk(KERN_WARNING 
			       "fd_offset is not page aligned. Please convert program: %pD\n",
			       bprm->file);
		}

		if (!bprm->file->f_op->mmap||((fd_offset & ~PAGE_MASK) != 0)) {
			error = vm_brk(N_TXTADDR(ex), ex.a_text+ex.a_data);
			if (error)
				return error;

			read_code(bprm->file, N_TXTADDR(ex), fd_offset,
				  ex.a_text + ex.a_data);
			goto beyond_if;
		}

		error = vm_mmap(bprm->file, N_TXTADDR(ex), ex.a_text,
			PROT_READ | PROT_EXEC,
			MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE | MAP_EXECUTABLE,
			fd_offset);

		if (error != N_TXTADDR(ex))
			return error;

		error = vm_mmap(bprm->file, N_DATADDR(ex), ex.a_data,
				PROT_READ | PROT_WRITE | PROT_EXEC,
				MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE | MAP_EXECUTABLE,
				fd_offset + ex.a_text);
		if (error != N_DATADDR(ex))
			return error;
	}
beyond_if:
	set_binfmt(&aout_format);

	retval = set_brk(current->mm->start_brk, current->mm->brk);
	if (retval < 0)
		return retval;

	current->mm->start_stack =
		(unsigned long) create_aout_tables((char __user *) bprm->p, bprm);
#ifdef __alpha__
	regs->gp = ex.a_gpvalue;
#endif
	finalize_exec(bprm);
	start_thread(regs, ex.a_entry, current->mm->start_stack);
	return 0;
}

static int load_aout_library(struct file *file)
{
	struct inode * inode;
	unsigned long bss, start_addr, len;
	unsigned long error;
	int retval;
	struct exec ex;
	loff_t pos = 0;

	inode = file_inode(file);

	retval = -ENOEXEC;
	error = kernel_read(file, &ex, sizeof(ex), &pos);
	if (error != sizeof(ex))
		goto out;

	/* We come in here for the regular a.out style of shared libraries */
	if ((N_MAGIC(ex) != ZMAGIC && N_MAGIC(ex) != QMAGIC) || N_TRSIZE(ex) ||
	    N_DRSIZE(ex) || ((ex.a_entry & 0xfff) && N_MAGIC(ex) == ZMAGIC) ||
	    i_size_read(inode) < ex.a_text+ex.a_data+N_SYMSIZE(ex)+N_TXTOFF(ex)) {
		goto out;
	}

	/*
	 * Requires a mmap handler. This prevents people from using a.out
	 * as part of an exploit attack against /proc-related vulnerabilities.
	 */
	if (!file->f_op->mmap)
		goto out;

	if (N_FLAGS(ex))
		goto out;

	/* For  QMAGIC, the starting address is 0x20 into the page.  We mask
	   this off to get the starting address for the page */

	start_addr =  ex.a_entry & 0xfffff000;

	if ((N_TXTOFF(ex) & ~PAGE_MASK) != 0) {
		if (printk_ratelimit())
		{
			printk(KERN_WARNING 
			       "N_TXTOFF is not page aligned. Please convert library: %pD\n",
			       file);
		}
		retval = vm_brk(start_addr, ex.a_text + ex.a_data + ex.a_bss);
		if (retval)
			goto out;

		read_code(file, start_addr, N_TXTOFF(ex),
			  ex.a_text + ex.a_data);
		retval = 0;
		goto out;
	}
	/* Now use mmap to map the library into memory. */
	error = vm_mmap(file, start_addr, ex.a_text + ex.a_data,
			PROT_READ | PROT_WRITE | PROT_EXEC,
			MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE,
			N_TXTOFF(ex));
	retval = error;
	if (error != start_addr)
		goto out;

	len = PAGE_ALIGN(ex.a_text + ex.a_data);
	bss = ex.a_text + ex.a_data + ex.a_bss;
	if (bss > len) {
		retval = vm_brk(start_addr + len, bss - len);
		if (retval)
			goto out;
	}
	retval = 0;
out:
	return retval;
}

static int __init init_aout_binfmt(void)
{
	register_binfmt(&aout_format);
	return 0;
}

static void __exit exit_aout_binfmt(void)
{
	unregister_binfmt(&aout_format);
}

core_initcall(init_aout_binfmt);
module_exit(exit_aout_binfmt);
MODULE_LICENSE("GPL");
Commit	Line	Data
09c434b8	1	// SPDX-License-Identifier: GPL-2.0-only
1da177e4 LT	2	/*
	3	* linux/fs/binfmt_aout.c
	4	*
	5	* Copyright (C) 1991, 1992, 1996 Linus Torvalds
	6	*/
	7
	8	#include <linux/module.h>
	9
	10	#include <linux/time.h>
	11	#include <linux/kernel.h>
	12	#include <linux/mm.h>
	13	#include <linux/mman.h>
	14	#include <linux/a.out.h>
	15	#include <linux/errno.h>
	16	#include <linux/signal.h>
	17	#include <linux/string.h>
	18	#include <linux/fs.h>
	19	#include <linux/file.h>
	20	#include <linux/stat.h>
	21	#include <linux/fcntl.h>
	22	#include <linux/ptrace.h>
	23	#include <linux/user.h>
1da177e4 LT	24	#include <linux/binfmts.h>
	25	#include <linux/personality.h>
	26	#include <linux/init.h>
088e7af7	27	#include <linux/coredump.h>
5a0e3ad6	28	#include <linux/slab.h>
68db0cf1	29	#include <linux/sched/task_stack.h>
1da177e4	30
7c0f6ba6	31	#include <linux/uaccess.h>
1da177e4 LT	32	#include <asm/cacheflush.h>
1da177e4 LT	33
71613c3b	34	static int load_aout_binary(struct linux_binprm *);
1da177e4	35	static int load_aout_library(struct file*);
1da177e4	36
046d662f AK	37	static struct linux_binfmt aout_format = {
	38	.module = THIS_MODULE,
	39	.load_binary = load_aout_binary,
	40	.load_shlib = load_aout_library,
046d662f AK	41	};
	42
	43	#define BAD_ADDR(x) ((unsigned long)(x) >= TASK_SIZE)
	44
	45	static int set_brk(unsigned long start, unsigned long end)
	46	{
	47	start = PAGE_ALIGN(start);
	48	end = PAGE_ALIGN(end);
5d22fc25 LT	49	if (end > start)
5d22fc25 LT	50	return vm_brk(start, end - start);
046d662f AK	51	return 0;
046d662f AK	52	}
1da177e4 LT	53
	54	/*
	55	* create_aout_tables() parses the env- and arg-strings in new user
	56	* memory and creates the pointer tables from them, and puts their
	57	* addresses on the "stack", returning the new stack pointer value.
	58	*/
	59	static unsigned long __user create_aout_tables(char __user p, struct linux_binprm * bprm)
	60	{
	61	char __user * __user *argv;
	62	char __user * __user *envp;
	63	unsigned long __user *sp;
	64	int argc = bprm->argc;
	65	int envc = bprm->envc;
	66
	67	sp = (void __user )((-(unsigned long)sizeof(char )) & (unsigned long) p);
1da177e4 LT	68	#ifdef __alpha__
	69	/* whee.. test-programs are so much fun. */
	70	put_user(0, --sp);
	71	put_user(0, --sp);
	72	if (bprm->loader) {
	73	put_user(0, --sp);
17580d7f	74	put_user(1003, --sp);
1da177e4	75	put_user(bprm->loader, --sp);
17580d7f	76	put_user(1002, --sp);
1da177e4 LT	77	}
1da177e4 LT	78	put_user(bprm->exec, --sp);
17580d7f	79	put_user(1001, --sp);
1da177e4 LT	80	#endif
	81	sp -= envc+1;
	82	envp = (char __user * __user *) sp;
	83	sp -= argc+1;
	84	argv = (char __user * __user *) sp;
17580d7f	85	#ifndef __alpha__
1da177e4 LT	86	put_user((unsigned long) envp,--sp);
	87	put_user((unsigned long) argv,--sp);
	88	#endif
	89	put_user(argc,--sp);
	90	current->mm->arg_start = (unsigned long) p;
	91	while (argc-->0) {
	92	char c;
	93	put_user(p,argv++);
	94	do {
	95	get_user(c,p++);
	96	} while (c);
	97	}
	98	put_user(NULL,argv);
	99	current->mm->arg_end = current->mm->env_start = (unsigned long) p;
	100	while (envc-->0) {
	101	char c;
	102	put_user(p,envp++);
	103	do {
	104	get_user(c,p++);
	105	} while (c);
	106	}
	107	put_user(NULL,envp);
	108	current->mm->env_end = (unsigned long) p;
	109	return sp;
	110	}
	111
	112	/*
	113	* These are the functions used to load a.out style executables and shared
	114	* libraries. There is no binary dependent code anywhere else.
	115	*/
	116
71613c3b	117	static int load_aout_binary(struct linux_binprm * bprm)
1da177e4	118	{
71613c3b	119	struct pt_regs *regs = current_pt_regs();
1da177e4 LT	120	struct exec ex;
	121	unsigned long error;
	122	unsigned long fd_offset;
	123	unsigned long rlim;
	124	int retval;
	125
	126	ex = ((struct exec ) bprm->buf); /* exec-header */
	127	if ((N_MAGIC(ex) != ZMAGIC && N_MAGIC(ex) != OMAGIC &&
	128	N_MAGIC(ex) != QMAGIC && N_MAGIC(ex) != NMAGIC) \|\|
	129	N_TRSIZE(ex) \|\| N_DRSIZE(ex) \|\|
496ad9aa	130	i_size_read(file_inode(bprm->file)) < ex.a_text+ex.a_data+N_SYMSIZE(ex)+N_TXTOFF(ex)) {
1da177e4 LT	131	return -ENOEXEC;
	132	}
	133
8454aeef ET	134	/*
	135	* Requires a mmap handler. This prevents people from using a.out
	136	* as part of an exploit attack against /proc-related vulnerabilities.
	137	*/
72c2d531	138	if (!bprm->file->f_op->mmap)
8454aeef ET	139	return -ENOEXEC;
8454aeef ET	140
1da177e4 LT	141	fd_offset = N_TXTOFF(ex);
	142
	143	/* Check initial limits. This avoids letting people circumvent
	144	* size limits imposed on them by creating programs with large
	145	* arrays in the data or bss.
	146	*/
d554ed89	147	rlim = rlimit(RLIMIT_DATA);
1da177e4 LT	148	if (rlim >= RLIM_INFINITY)
	149	rlim = ~0;
	150	if (ex.a_data + ex.a_bss > rlim)
	151	return -ENOMEM;
	152
	153	/* Flush all traces of the currently running executable */
2388777a	154	retval = begin_new_exec(bprm);
1da177e4 LT	155	if (retval)
	156	return retval;
	157
	158	/* OK, This is the point of no return */
17580d7f	159	#ifdef __alpha__
1da177e4	160	SET_AOUT_PERSONALITY(bprm, ex);
1da177e4 LT	161	#else
	162	set_personality(PER_LINUX);
	163	#endif
221af7f8	164	setup_new_exec(bprm);
1da177e4 LT	165
	166	current->mm->end_code = ex.a_text +
	167	(current->mm->start_code = N_TXTADDR(ex));
	168	current->mm->end_data = ex.a_data +
	169	(current->mm->start_data = N_DATADDR(ex));
	170	current->mm->brk = ex.a_bss +
	171	(current->mm->start_brk = N_BSSADDR(ex));
1da177e4	172
6414fa6a	173	retval = setup_arg_pages(bprm, STACK_TOP, EXSTACK_DEFAULT);
19d860a1	174	if (retval < 0)
6414fa6a	175	return retval;
6414fa6a	176
1da177e4 LT	177
	178	if (N_MAGIC(ex) == OMAGIC) {
	179	unsigned long text_addr, map_size;
	180	loff_t pos;
	181
	182	text_addr = N_TXTADDR(ex);
	183
fe30af97	184	#ifdef __alpha__
1da177e4 LT	185	pos = fd_offset;
	186	map_size = ex.a_text+ex.a_data + PAGE_SIZE - 1;
	187	#else
	188	pos = 32;
	189	map_size = ex.a_text+ex.a_data;
	190	#endif
e4eb1ff6	191	error = vm_brk(text_addr & PAGE_MASK, map_size);
5d22fc25	192	if (error)
1da177e4	193	return error;
1da177e4	194
3dc20cb2 AV	195	error = read_code(bprm->file, text_addr, pos,
3dc20cb2 AV	196	ex.a_text+ex.a_data);
19d860a1	197	if ((signed long)error < 0)
1da177e4	198	return error;
1da177e4	199	} else {
1da177e4	200	if ((ex.a_text & 0xfff \|\| ex.a_data & 0xfff) &&
2e50b6cc	201	(N_MAGIC(ex) != NMAGIC) && printk_ratelimit())
1da177e4 LT	202	{
1da177e4 LT	203	printk(KERN_NOTICE "executable not page aligned\n");
1da177e4 LT	204	}
1da177e4 LT	205
2e50b6cc	206	if ((fd_offset & ~PAGE_MASK) != 0 && printk_ratelimit())
1da177e4 LT	207	{
1da177e4 LT	208	printk(KERN_WARNING
a455589f AV	209	"fd_offset is not page aligned. Please convert program: %pD\n",
a455589f AV	210	bprm->file);
1da177e4 LT	211	}
	212
	213	if (!bprm->file->f_op->mmap\|\|((fd_offset & ~PAGE_MASK) != 0)) {
864778b1	214	error = vm_brk(N_TXTADDR(ex), ex.a_text+ex.a_data);
5d22fc25	215	if (error)
864778b1 MH	216	return error;
864778b1 MH	217
3dc20cb2 AV	218	read_code(bprm->file, N_TXTADDR(ex), fd_offset,
3dc20cb2 AV	219	ex.a_text + ex.a_data);
1da177e4 LT	220	goto beyond_if;
	221	}
	222
6be5ceb0	223	error = vm_mmap(bprm->file, N_TXTADDR(ex), ex.a_text,
1da177e4 LT	224	PROT_READ \| PROT_EXEC,
	225	MAP_FIXED \| MAP_PRIVATE \| MAP_DENYWRITE \| MAP_EXECUTABLE,
	226	fd_offset);
1da177e4	227
19d860a1	228	if (error != N_TXTADDR(ex))
1da177e4	229	return error;
1da177e4	230
6be5ceb0	231	error = vm_mmap(bprm->file, N_DATADDR(ex), ex.a_data,
1da177e4 LT	232	PROT_READ \| PROT_WRITE \| PROT_EXEC,
	233	MAP_FIXED \| MAP_PRIVATE \| MAP_DENYWRITE \| MAP_EXECUTABLE,
	234	fd_offset + ex.a_text);
19d860a1	235	if (error != N_DATADDR(ex))
1da177e4	236	return error;
1da177e4 LT	237	}
	238	beyond_if:
	239	set_binfmt(&aout_format);
	240
	241	retval = set_brk(current->mm->start_brk, current->mm->brk);
19d860a1	242	if (retval < 0)
1da177e4	243	return retval;
1da177e4	244
1da177e4 LT	245	current->mm->start_stack =
	246	(unsigned long) create_aout_tables((char __user *) bprm->p, bprm);
	247	#ifdef __alpha__
	248	regs->gp = ex.a_gpvalue;
	249	#endif
b8383831	250	finalize_exec(bprm);
1da177e4	251	start_thread(regs, ex.a_entry, current->mm->start_stack);
1da177e4 LT	252	return 0;
	253	}
	254
	255	static int load_aout_library(struct file *file)
	256	{
	257	struct inode * inode;
	258	unsigned long bss, start_addr, len;
	259	unsigned long error;
	260	int retval;
	261	struct exec ex;
bdd1d2d3	262	loff_t pos = 0;
1da177e4	263
496ad9aa	264	inode = file_inode(file);
1da177e4 LT	265
1da177e4 LT	266	retval = -ENOEXEC;
bdd1d2d3	267	error = kernel_read(file, &ex, sizeof(ex), &pos);
1da177e4 LT	268	if (error != sizeof(ex))
	269	goto out;
	270
	271	/* We come in here for the regular a.out style of shared libraries */
	272	if ((N_MAGIC(ex) != ZMAGIC && N_MAGIC(ex) != QMAGIC) \|\| N_TRSIZE(ex) \|\|
	273	N_DRSIZE(ex) \|\| ((ex.a_entry & 0xfff) && N_MAGIC(ex) == ZMAGIC) \|\|
	274	i_size_read(inode) < ex.a_text+ex.a_data+N_SYMSIZE(ex)+N_TXTOFF(ex)) {
	275	goto out;
	276	}
	277
8454aeef ET	278	/*
	279	* Requires a mmap handler. This prevents people from using a.out
	280	* as part of an exploit attack against /proc-related vulnerabilities.
	281	*/
72c2d531	282	if (!file->f_op->mmap)
8454aeef ET	283	goto out;
8454aeef ET	284
1da177e4 LT	285	if (N_FLAGS(ex))
	286	goto out;
	287
	288	/* For QMAGIC, the starting address is 0x20 into the page. We mask
	289	this off to get the starting address for the page */
	290
	291	start_addr = ex.a_entry & 0xfffff000;
	292
	293	if ((N_TXTOFF(ex) & ~PAGE_MASK) != 0) {
2e50b6cc	294	if (printk_ratelimit())
1da177e4 LT	295	{
1da177e4 LT	296	printk(KERN_WARNING
a455589f AV	297	"N_TXTOFF is not page aligned. Please convert library: %pD\n",
a455589f AV	298	file);
1da177e4	299	}
864778b1	300	retval = vm_brk(start_addr, ex.a_text + ex.a_data + ex.a_bss);
5d22fc25	301	if (retval)
864778b1 MH	302	goto out;
864778b1 MH	303
3dc20cb2 AV	304	read_code(file, start_addr, N_TXTOFF(ex),
3dc20cb2 AV	305	ex.a_text + ex.a_data);
1da177e4 LT	306	retval = 0;
	307	goto out;
	308	}
	309	/* Now use mmap to map the library into memory. */
6be5ceb0	310	error = vm_mmap(file, start_addr, ex.a_text + ex.a_data,
1da177e4 LT	311	PROT_READ \| PROT_WRITE \| PROT_EXEC,
	312	MAP_FIXED \| MAP_PRIVATE \| MAP_DENYWRITE,
	313	N_TXTOFF(ex));
1da177e4 LT	314	retval = error;
	315	if (error != start_addr)
	316	goto out;
	317
	318	len = PAGE_ALIGN(ex.a_text + ex.a_data);
	319	bss = ex.a_text + ex.a_data + ex.a_bss;
	320	if (bss > len) {
5d22fc25 LT	321	retval = vm_brk(start_addr + len, bss - len);
5d22fc25 LT	322	if (retval)
1da177e4 LT	323	goto out;
	324	}
	325	retval = 0;
	326	out:
	327	return retval;
	328	}
	329
	330	static int __init init_aout_binfmt(void)
	331	{
8fc3dc5a AV	332	register_binfmt(&aout_format);
8fc3dc5a AV	333	return 0;
1da177e4 LT	334	}
	335
	336	static void __exit exit_aout_binfmt(void)
	337	{
	338	unregister_binfmt(&aout_format);
	339	}
	340
	341	core_initcall(init_aout_binfmt);
	342	module_exit(exit_aout_binfmt);
	343	MODULE_LICENSE("GPL");