91 		Node *e = list_entry(l, Node, list);  in check_file()  local
96 		if (!test_bit(Enabled, &e->flags))  in check_file()
100 		if (!test_bit(Magic, &e->flags)) {  in check_file()
101 			if (p && !strcmp(e->magic, p + 1))  in check_file()
102 				return e;  in check_file()
107 		s = bprm->buf + e->offset;  in check_file()
108 		if (e->mask) {  in check_file()
109 			for (j = 0; j < e->size; j++)  in check_file()
110 				if ((*s++ ^ e->magic[j]) & e->mask[j])  in check_file()
113 			for (j = 0; j < e->size; j++)  in check_file()
114 				if ((*s++ ^ e->magic[j]))  in check_file()
117 		if (j == e->size)  in check_file()
118 			return e;  in check_file()
262 static char *check_special_flags(char *sfs, Node *e)  in check_special_flags()  argument
273 			e->flags |= MISC_FMT_PRESERVE_ARGV0;  in check_special_flags()
278 			e->flags |= MISC_FMT_OPEN_BINARY;  in check_special_flags()
285 			e->flags |= (MISC_FMT_CREDENTIALS |  in check_special_flags()
303 	Node *e;  in create_entry()  local
317 	e = kmalloc(memsize, GFP_KERNEL);  in create_entry()
318 	if (!e)  in create_entry()
321 	p = buf = (char *)e + sizeof(Node);  in create_entry()
323 	memset(e, 0, sizeof(Node));  in create_entry()
335 	e->name = p;  in create_entry()
340 	if (!e->name[0] ||  in create_entry()
341 	    !strcmp(e->name, ".") ||  in create_entry()
342 	    !strcmp(e->name, "..") ||  in create_entry()
343 	    strchr(e->name, '/'))  in create_entry()
346 	pr_debug("register: name: {%s}\n", e->name);  in create_entry()
352 		e->flags = 1 << Enabled;  in create_entry()
356 		e->flags = (1 << Enabled) | (1 << Magic);  in create_entry()
364 	if (test_bit(Magic, &e->flags)) {  in create_entry()
373 		e->offset = simple_strtoul(p, &p, 10);  in create_entry()
376 		pr_debug("register: offset: %#x\n", e->offset);  in create_entry()
379 		e->magic = p;  in create_entry()
383 		if (!e->magic[0])  in create_entry()
388 				DUMP_PREFIX_NONE, e->magic, p - e->magic);  in create_entry()
391 		e->mask = p;  in create_entry()
395 		if (!e->mask[0]) {  in create_entry()
396 			e->mask = NULL;  in create_entry()
401 				DUMP_PREFIX_NONE, e->mask, p - e->mask);  in create_entry()
409 		e->size = string_unescape_inplace(e->magic, UNESCAPE_HEX);  in create_entry()
410 		if (e->mask &&  in create_entry()
411 		    string_unescape_inplace(e->mask, UNESCAPE_HEX) != e->size)  in create_entry()
413 		if (e->size + e->offset > BINPRM_BUF_SIZE)  in create_entry()
415 		pr_debug("register: magic/mask length: %i\n", e->size);  in create_entry()
419 				DUMP_PREFIX_NONE, e->magic, e->size);  in create_entry()
421 			if (e->mask) {  in create_entry()
423 				char *masked = kmalloc(e->size, GFP_KERNEL);  in create_entry()
427 					DUMP_PREFIX_NONE, e->mask, e->size);  in create_entry()
430 					for (i = 0; i < e->size; ++i)  in create_entry()
431 						masked[i] = e->magic[i] & e->mask[i];  in create_entry()
434 						DUMP_PREFIX_NONE, masked, e->size);  in create_entry()
450 		e->magic = p;  in create_entry()
455 		if (!e->magic[0] || strchr(e->magic, '/'))  in create_entry()
457 		pr_debug("register: extension: {%s}\n", e->magic);  in create_entry()
467 	e->interpreter = p;  in create_entry()
472 	if (!e->interpreter[0])  in create_entry()
474 	pr_debug("register: interpreter: {%s}\n", e->interpreter);  in create_entry()
477 	p = check_special_flags(p, e);  in create_entry()
483 	return e;  in create_entry()
489 	kfree(e);  in create_entry()
492 	kfree(e);  in create_entry()
523 static void entry_status(Node *e, char *page)  in entry_status()  argument
528 	if (test_bit(Enabled, &e->flags))  in entry_status()
536 	dp += sprintf(dp, "%s\ninterpreter %s\n", status, e->interpreter);  in entry_status()
540 	if (e->flags & MISC_FMT_PRESERVE_ARGV0)  in entry_status()
542 	if (e->flags & MISC_FMT_OPEN_BINARY)  in entry_status()
544 	if (e->flags & MISC_FMT_CREDENTIALS)  in entry_status()
548 	if (!test_bit(Magic, &e->flags)) {  in entry_status()
549 		sprintf(dp, "extension .%s\n", e->magic);  in entry_status()
551 		dp += sprintf(dp, "offset %i\nmagic ", e->offset);  in entry_status()
552 		dp = bin2hex(dp, e->magic, e->size);  in entry_status()
553 		if (e->mask) {  in entry_status()
555 			dp = bin2hex(dp, e->mask, e->size);  in entry_status()
581 static void kill_node(Node *e)  in kill_node()  argument
586 	dentry = e->dentry;  in kill_node()
588 		list_del_init(&e->list);  in kill_node()
589 		e->dentry = NULL;  in kill_node()
606 	Node *e = file_inode(file)->i_private;  in bm_entry_read()  local
614 	entry_status(e, page);  in bm_entry_read()
626 	Node *e = file_inode(file)->i_private;  in bm_entry_write()  local
632 		clear_bit(Enabled, &e->flags);  in bm_entry_write()
636 		set_bit(Enabled, &e->flags);  in bm_entry_write()
643 		kill_node(e);  in bm_entry_write()
666 	Node *e;  in bm_register_write()  local
672 	e = create_entry(buffer, count);  in bm_register_write()
674 	if (IS_ERR(e))  in bm_register_write()
675 		return PTR_ERR(e);  in bm_register_write()
679 	dentry = lookup_one_len(e->name, root, strlen(e->name));  in bm_register_write()
701 	e->dentry = dget(dentry);  in bm_register_write()
702 	inode->i_private = e;  in bm_register_write()
707 	list_add(&e->list, &entries);  in bm_register_write()
718 		kfree(e);  in bm_register_write()