97 	Node *e;  in search_binfmt_handler()  local
100 	list_for_each_entry(e, &entries, list) {  in search_binfmt_handler()
105 		if (!test_bit(Enabled, &e->flags))  in search_binfmt_handler()
109 		if (!test_bit(Magic, &e->flags)) {  in search_binfmt_handler()
110 			if (p && !strcmp(e->magic, p + 1))  in search_binfmt_handler()
111 				return e;  in search_binfmt_handler()
116 		s = bprm->buf + e->offset;  in search_binfmt_handler()
117 		if (e->mask) {  in search_binfmt_handler()
118 			for (j = 0; j < e->size; j++)  in search_binfmt_handler()
119 				if ((*s++ ^ e->magic[j]) & e->mask[j])  in search_binfmt_handler()
122 			for (j = 0; j < e->size; j++)  in search_binfmt_handler()
123 				if ((*s++ ^ e->magic[j]))  in search_binfmt_handler()
126 		if (j == e->size)  in search_binfmt_handler()
127 			return e;  in search_binfmt_handler()
145 	Node *e;  in get_binfmt_handler()  local
148 	e = search_binfmt_handler(bprm);  in get_binfmt_handler()
149 	if (e)  in get_binfmt_handler()
150 		refcount_inc(&e->users);  in get_binfmt_handler()
152 	return e;  in get_binfmt_handler()
163 static void put_binfmt_handler(Node *e)  in put_binfmt_handler()  argument
165 	if (refcount_dec_and_test(&e->users)) {  in put_binfmt_handler()
166 		if (e->flags & MISC_FMT_OPEN_FILE)  in put_binfmt_handler()
167 			filp_close(e->interp_file, NULL);  in put_binfmt_handler()
168 		kfree(e);  in put_binfmt_handler()
277 static char *check_special_flags(char *sfs, Node *e)  in check_special_flags()  argument
288 			e->flags |= MISC_FMT_PRESERVE_ARGV0;  in check_special_flags()
293 			e->flags |= MISC_FMT_OPEN_BINARY;  in check_special_flags()
300 			e->flags |= (MISC_FMT_CREDENTIALS |  in check_special_flags()
306 			e->flags |= MISC_FMT_OPEN_FILE;  in check_special_flags()
323 	Node *e;  in create_entry()  local
337 	e = kmalloc(memsize, GFP_KERNEL);  in create_entry()
338 	if (!e)  in create_entry()
341 	p = buf = (char *)e + sizeof(Node);  in create_entry()
343 	memset(e, 0, sizeof(Node));  in create_entry()
355 	e->name = p;  in create_entry()
360 	if (!e->name[0] ||  in create_entry()
361 	    !strcmp(e->name, ".") ||  in create_entry()
362 	    !strcmp(e->name, "..") ||  in create_entry()
363 	    strchr(e->name, '/'))  in create_entry()
366 	pr_debug("register: name: {%s}\n", e->name);  in create_entry()
372 		e->flags = 1 << Enabled;  in create_entry()
376 		e->flags = (1 << Enabled) | (1 << Magic);  in create_entry()
384 	if (test_bit(Magic, &e->flags)) {  in create_entry()
394 			int r = kstrtoint(p, 10, &e->offset);  in create_entry()
395 			if (r != 0 || e->offset < 0)  in create_entry()
401 		pr_debug("register: offset: %#x\n", e->offset);  in create_entry()
404 		e->magic = p;  in create_entry()
408 		if (!e->magic[0])  in create_entry()
413 				DUMP_PREFIX_NONE, e->magic, p - e->magic);  in create_entry()
416 		e->mask = p;  in create_entry()
420 		if (!e->mask[0]) {  in create_entry()
421 			e->mask = NULL;  in create_entry()
426 				DUMP_PREFIX_NONE, e->mask, p - e->mask);  in create_entry()
434 		e->size = string_unescape_inplace(e->magic, UNESCAPE_HEX);  in create_entry()
435 		if (e->mask &&  in create_entry()
436 		    string_unescape_inplace(e->mask, UNESCAPE_HEX) != e->size)  in create_entry()
438 		if (e->size > BINPRM_BUF_SIZE ||  in create_entry()
439 		    BINPRM_BUF_SIZE - e->size < e->offset)  in create_entry()
441 		pr_debug("register: magic/mask length: %i\n", e->size);  in create_entry()
445 				DUMP_PREFIX_NONE, e->magic, e->size);  in create_entry()
447 			if (e->mask) {  in create_entry()
449 				char *masked = kmalloc(e->size, GFP_KERNEL);  in create_entry()
453 					DUMP_PREFIX_NONE, e->mask, e->size);  in create_entry()
456 					for (i = 0; i < e->size; ++i)  in create_entry()
457 						masked[i] = e->magic[i] & e->mask[i];  in create_entry()
460 						DUMP_PREFIX_NONE, masked, e->size);  in create_entry()
476 		e->magic = p;  in create_entry()
481 		if (!e->magic[0] || strchr(e->magic, '/'))  in create_entry()
483 		pr_debug("register: extension: {%s}\n", e->magic);  in create_entry()
493 	e->interpreter = p;  in create_entry()
498 	if (!e->interpreter[0])  in create_entry()
500 	pr_debug("register: interpreter: {%s}\n", e->interpreter);  in create_entry()
503 	p = check_special_flags(p, e);  in create_entry()
509 	return e;  in create_entry()
515 	kfree(e);  in create_entry()
518 	kfree(e);  in create_entry()
549 static void entry_status(Node *e, char *page)  in entry_status()  argument
554 	if (test_bit(Enabled, &e->flags))  in entry_status()
562 	dp += sprintf(dp, "%s\ninterpreter %s\n", status, e->interpreter);  in entry_status()
566 	if (e->flags & MISC_FMT_PRESERVE_ARGV0)  in entry_status()
568 	if (e->flags & MISC_FMT_OPEN_BINARY)  in entry_status()
570 	if (e->flags & MISC_FMT_CREDENTIALS)  in entry_status()
572 	if (e->flags & MISC_FMT_OPEN_FILE)  in entry_status()
576 	if (!test_bit(Magic, &e->flags)) {  in entry_status()
577 		sprintf(dp, "extension .%s\n", e->magic);  in entry_status()
579 		dp += sprintf(dp, "offset %i\nmagic ", e->offset);  in entry_status()
580 		dp = bin2hex(dp, e->magic, e->size);  in entry_status()
581 		if (e->mask) {  in entry_status()
583 			dp = bin2hex(dp, e->mask, e->size);  in entry_status()
617 	Node *e = inode->i_private;  in bm_evict_inode()  local
621 	if (e) {  in bm_evict_inode()
623 		if (!list_empty(&e->list))  in bm_evict_inode()
624 			list_del_init(&e->list);  in bm_evict_inode()
626 		put_binfmt_handler(e);  in bm_evict_inode()
680 static void remove_binfmt_handler(Node *e)  in remove_binfmt_handler()  argument
683 	list_del_init(&e->list);  in remove_binfmt_handler()
685 	unlink_binfmt_dentry(e->dentry);  in remove_binfmt_handler()
693 	Node *e = file_inode(file)->i_private;  in bm_entry_read()  local
701 	entry_status(e, page);  in bm_entry_read()
713 	Node *e = inode->i_private;  in bm_entry_write()  local
719 		clear_bit(Enabled, &e->flags);  in bm_entry_write()
723 		set_bit(Enabled, &e->flags);  in bm_entry_write()
739 		if (!list_empty(&e->list))  in bm_entry_write()
740 			remove_binfmt_handler(e);  in bm_entry_write()
762 	Node *e;  in bm_register_write()  local
769 	e = create_entry(buffer, count);  in bm_register_write()
771 	if (IS_ERR(e))  in bm_register_write()
772 		return PTR_ERR(e);  in bm_register_write()
774 	if (e->flags & MISC_FMT_OPEN_FILE) {  in bm_register_write()
775 		f = open_exec(e->interpreter);  in bm_register_write()
778 				 e->interpreter);  in bm_register_write()
779 			kfree(e);  in bm_register_write()
782 		e->interp_file = f;  in bm_register_write()
786 	dentry = lookup_one_len(e->name, root, strlen(e->name));  in bm_register_write()
801 	refcount_set(&e->users, 1);  in bm_register_write()
802 	e->dentry = dget(dentry);  in bm_register_write()
803 	inode->i_private = e;  in bm_register_write()
808 	list_add(&e->list, &entries);  in bm_register_write()
820 		kfree(e);  in bm_register_write()
845 	Node *e, *next;  in bm_status_write()  local
871 		list_for_each_entry_safe(e, next, &entries, list)  in bm_status_write()
872 			remove_binfmt_handler(e);  in bm_status_write()