97 		Node *e = list_entry(l, Node, list);  in check_file()  local
102 		if (!test_bit(Enabled, &e->flags))  in check_file()
106 		if (!test_bit(Magic, &e->flags)) {  in check_file()
107 			if (p && !strcmp(e->magic, p + 1))  in check_file()
108 				return e;  in check_file()
113 		s = bprm->buf + e->offset;  in check_file()
114 		if (e->mask) {  in check_file()
115 			for (j = 0; j < e->size; j++)  in check_file()
116 				if ((*s++ ^ e->magic[j]) & e->mask[j])  in check_file()
119 			for (j = 0; j < e->size; j++)  in check_file()
120 				if ((*s++ ^ e->magic[j]))  in check_file()
123 		if (j == e->size)  in check_file()
124 			return e;  in check_file()
230 static char *check_special_flags(char *sfs, Node *e)  in check_special_flags()  argument
241 			e->flags |= MISC_FMT_PRESERVE_ARGV0;  in check_special_flags()
246 			e->flags |= MISC_FMT_OPEN_BINARY;  in check_special_flags()
253 			e->flags |= (MISC_FMT_CREDENTIALS |  in check_special_flags()
259 			e->flags |= MISC_FMT_OPEN_FILE;  in check_special_flags()
276 	Node *e;  in create_entry()  local
290 	e = kmalloc(memsize, GFP_KERNEL);  in create_entry()
291 	if (!e)  in create_entry()
294 	p = buf = (char *)e + sizeof(Node);  in create_entry()
296 	memset(e, 0, sizeof(Node));  in create_entry()
308 	e->name = p;  in create_entry()
313 	if (!e->name[0] ||  in create_entry()
314 	    !strcmp(e->name, ".") ||  in create_entry()
315 	    !strcmp(e->name, "..") ||  in create_entry()
316 	    strchr(e->name, '/'))  in create_entry()
319 	pr_debug("register: name: {%s}\n", e->name);  in create_entry()
325 		e->flags = 1 << Enabled;  in create_entry()
329 		e->flags = (1 << Enabled) | (1 << Magic);  in create_entry()
337 	if (test_bit(Magic, &e->flags)) {  in create_entry()
347 			int r = kstrtoint(p, 10, &e->offset);  in create_entry()
348 			if (r != 0 || e->offset < 0)  in create_entry()
354 		pr_debug("register: offset: %#x\n", e->offset);  in create_entry()
357 		e->magic = p;  in create_entry()
361 		if (!e->magic[0])  in create_entry()
366 				DUMP_PREFIX_NONE, e->magic, p - e->magic);  in create_entry()
369 		e->mask = p;  in create_entry()
373 		if (!e->mask[0]) {  in create_entry()
374 			e->mask = NULL;  in create_entry()
379 				DUMP_PREFIX_NONE, e->mask, p - e->mask);  in create_entry()
387 		e->size = string_unescape_inplace(e->magic, UNESCAPE_HEX);  in create_entry()
388 		if (e->mask &&  in create_entry()
389 		    string_unescape_inplace(e->mask, UNESCAPE_HEX) != e->size)  in create_entry()
391 		if (e->size > BINPRM_BUF_SIZE ||  in create_entry()
392 		    BINPRM_BUF_SIZE - e->size < e->offset)  in create_entry()
394 		pr_debug("register: magic/mask length: %i\n", e->size);  in create_entry()
398 				DUMP_PREFIX_NONE, e->magic, e->size);  in create_entry()
400 			if (e->mask) {  in create_entry()
402 				char *masked = kmalloc(e->size, GFP_KERNEL);  in create_entry()
406 					DUMP_PREFIX_NONE, e->mask, e->size);  in create_entry()
409 					for (i = 0; i < e->size; ++i)  in create_entry()
410 						masked[i] = e->magic[i] & e->mask[i];  in create_entry()
413 						DUMP_PREFIX_NONE, masked, e->size);  in create_entry()
429 		e->magic = p;  in create_entry()
434 		if (!e->magic[0] || strchr(e->magic, '/'))  in create_entry()
436 		pr_debug("register: extension: {%s}\n", e->magic);  in create_entry()
446 	e->interpreter = p;  in create_entry()
451 	if (!e->interpreter[0])  in create_entry()
453 	pr_debug("register: interpreter: {%s}\n", e->interpreter);  in create_entry()
456 	p = check_special_flags(p, e);  in create_entry()
462 	return e;  in create_entry()
468 	kfree(e);  in create_entry()
471 	kfree(e);  in create_entry()
502 static void entry_status(Node *e, char *page)  in entry_status()  argument
507 	if (test_bit(Enabled, &e->flags))  in entry_status()
515 	dp += sprintf(dp, "%s\ninterpreter %s\n", status, e->interpreter);  in entry_status()
519 	if (e->flags & MISC_FMT_PRESERVE_ARGV0)  in entry_status()
521 	if (e->flags & MISC_FMT_OPEN_BINARY)  in entry_status()
523 	if (e->flags & MISC_FMT_CREDENTIALS)  in entry_status()
525 	if (e->flags & MISC_FMT_OPEN_FILE)  in entry_status()
529 	if (!test_bit(Magic, &e->flags)) {  in entry_status()
530 		sprintf(dp, "extension .%s\n", e->magic);  in entry_status()
532 		dp += sprintf(dp, "offset %i\nmagic ", e->offset);  in entry_status()
533 		dp = bin2hex(dp, e->magic, e->size);  in entry_status()
534 		if (e->mask) {  in entry_status()
536 			dp = bin2hex(dp, e->mask, e->size);  in entry_status()
557 	Node *e = inode->i_private;  in bm_evict_inode()  local
559 	if (e && e->flags & MISC_FMT_OPEN_FILE)  in bm_evict_inode()
560 		filp_close(e->interp_file, NULL);  in bm_evict_inode()
563 	kfree(e);  in bm_evict_inode()
566 static void kill_node(Node *e)  in kill_node()  argument
571 	list_del_init(&e->list);  in kill_node()
574 	dentry = e->dentry;  in kill_node()
586 	Node *e = file_inode(file)->i_private;  in bm_entry_read()  local
594 	entry_status(e, page);  in bm_entry_read()
606 	Node *e = file_inode(file)->i_private;  in bm_entry_write()  local
612 		clear_bit(Enabled, &e->flags);  in bm_entry_write()
616 		set_bit(Enabled, &e->flags);  in bm_entry_write()
623 		if (!list_empty(&e->list))  in bm_entry_write()
624 			kill_node(e);  in bm_entry_write()
646 	Node *e;  in bm_register_write()  local
653 	e = create_entry(buffer, count);  in bm_register_write()
655 	if (IS_ERR(e))  in bm_register_write()
656 		return PTR_ERR(e);  in bm_register_write()
658 	if (e->flags & MISC_FMT_OPEN_FILE) {  in bm_register_write()
659 		f = open_exec(e->interpreter);  in bm_register_write()
662 				 e->interpreter);  in bm_register_write()
663 			kfree(e);  in bm_register_write()
666 		e->interp_file = f;  in bm_register_write()
670 	dentry = lookup_one_len(e->name, root, strlen(e->name));  in bm_register_write()
692 	e->dentry = dget(dentry);  in bm_register_write()
693 	inode->i_private = e;  in bm_register_write()
698 	list_add(&e->list, &entries);  in bm_register_write()
710 		kfree(e);  in bm_register_write()