95 	Node *e;  in search_binfmt_handler()  local
98 	list_for_each_entry(e, &misc->entries, list) {  in search_binfmt_handler()
103 		if (!test_bit(Enabled, &e->flags))  in search_binfmt_handler()
107 		if (!test_bit(Magic, &e->flags)) {  in search_binfmt_handler()
108 			if (p && !strcmp(e->magic, p + 1))  in search_binfmt_handler()
109 				return e;  in search_binfmt_handler()
114 		s = bprm->buf + e->offset;  in search_binfmt_handler()
115 		if (e->mask) {  in search_binfmt_handler()
116 			for (j = 0; j < e->size; j++)  in search_binfmt_handler()
117 				if ((*s++ ^ e->magic[j]) & e->mask[j])  in search_binfmt_handler()
120 			for (j = 0; j < e->size; j++)  in search_binfmt_handler()
121 				if ((*s++ ^ e->magic[j]))  in search_binfmt_handler()
124 		if (j == e->size)  in search_binfmt_handler()
125 			return e;  in search_binfmt_handler()
144 	Node *e;  in get_binfmt_handler()  local
147 	e = search_binfmt_handler(misc, bprm);  in get_binfmt_handler()
148 	if (e)  in get_binfmt_handler()
149 		refcount_inc(&e->users);  in get_binfmt_handler()
151 	return e;  in get_binfmt_handler()
156  * @e: node to put
162 static void put_binfmt_handler(Node *e)  in put_binfmt_handler()  argument
164 	if (refcount_dec_and_test(&e->users)) {  in put_binfmt_handler()
165 		if (e->flags & MISC_FMT_OPEN_FILE)  in put_binfmt_handler()
166 			filp_close(e->interp_file, NULL);  in put_binfmt_handler()
167 		kfree(e);  in put_binfmt_handler()
306 static char *check_special_flags(char *sfs, Node *e)  in check_special_flags()  argument
317 			e->flags |= MISC_FMT_PRESERVE_ARGV0;  in check_special_flags()
322 			e->flags |= MISC_FMT_OPEN_BINARY;  in check_special_flags()
329 			e->flags |= (MISC_FMT_CREDENTIALS |  in check_special_flags()
335 			e->flags |= MISC_FMT_OPEN_FILE;  in check_special_flags()
352 	Node *e;  in create_entry()  local
366 	e = kmalloc(memsize, GFP_KERNEL_ACCOUNT);  in create_entry()
367 	if (!e)  in create_entry()
370 	p = buf = (char *)e + sizeof(Node);  in create_entry()
372 	memset(e, 0, sizeof(Node));  in create_entry()
384 	e->name = p;  in create_entry()
389 	if (!e->name[0] ||  in create_entry()
390 	    !strcmp(e->name, ".") ||  in create_entry()
391 	    !strcmp(e->name, "..") ||  in create_entry()
392 	    strchr(e->name, '/'))  in create_entry()
395 	pr_debug("register: name: {%s}\n", e->name);  in create_entry()
399 	case 'E':  in create_entry()
400 		pr_debug("register: type: E (extension)\n");  in create_entry()
401 		e->flags = 1 << Enabled;  in create_entry()
405 		e->flags = (1 << Enabled) | (1 << Magic);  in create_entry()
413 	if (test_bit(Magic, &e->flags)) {  in create_entry()
423 			int r = kstrtoint(p, 10, &e->offset);  in create_entry()
424 			if (r != 0 || e->offset < 0)  in create_entry()
430 		pr_debug("register: offset: %#x\n", e->offset);  in create_entry()
433 		e->magic = p;  in create_entry()
437 		if (!e->magic[0])  in create_entry()
442 				DUMP_PREFIX_NONE, e->magic, p - e->magic);  in create_entry()
445 		e->mask = p;  in create_entry()
449 		if (!e->mask[0]) {  in create_entry()
450 			e->mask = NULL;  in create_entry()
455 				DUMP_PREFIX_NONE, e->mask, p - e->mask);  in create_entry()
463 		e->size = string_unescape_inplace(e->magic, UNESCAPE_HEX);  in create_entry()
464 		if (e->mask &&  in create_entry()
465 		    string_unescape_inplace(e->mask, UNESCAPE_HEX) != e->size)  in create_entry()
467 		if (e->size > BINPRM_BUF_SIZE ||  in create_entry()
468 		    BINPRM_BUF_SIZE - e->size < e->offset)  in create_entry()
470 		pr_debug("register: magic/mask length: %i\n", e->size);  in create_entry()
474 				DUMP_PREFIX_NONE, e->magic, e->size);  in create_entry()
476 			if (e->mask) {  in create_entry()
478 				char *masked = kmalloc(e->size, GFP_KERNEL_ACCOUNT);  in create_entry()
482 					DUMP_PREFIX_NONE, e->mask, e->size);  in create_entry()
485 					for (i = 0; i < e->size; ++i)  in create_entry()
486 						masked[i] = e->magic[i] & e->mask[i];  in create_entry()
489 						DUMP_PREFIX_NONE, masked, e->size);  in create_entry()
496 		/* Handle the 'E' (extension) format. */  in create_entry()
505 		e->magic = p;  in create_entry()
510 		if (!e->magic[0] || strchr(e->magic, '/'))  in create_entry()
512 		pr_debug("register: extension: {%s}\n", e->magic);  in create_entry()
522 	e->interpreter = p;  in create_entry()
527 	if (!e->interpreter[0])  in create_entry()
529 	pr_debug("register: interpreter: {%s}\n", e->interpreter);  in create_entry()
532 	p = check_special_flags(p, e);  in create_entry()
538 	return e;  in create_entry()
544 	kfree(e);  in create_entry()
547 	kfree(e);  in create_entry()
578 static void entry_status(Node *e, char *page)  in entry_status()  argument
583 	if (test_bit(Enabled, &e->flags))  in entry_status()
591 	dp += sprintf(dp, "%s\ninterpreter %s\n", status, e->interpreter);  in entry_status()
595 	if (e->flags & MISC_FMT_PRESERVE_ARGV0)  in entry_status()
597 	if (e->flags & MISC_FMT_OPEN_BINARY)  in entry_status()
599 	if (e->flags & MISC_FMT_CREDENTIALS)  in entry_status()
601 	if (e->flags & MISC_FMT_OPEN_FILE)  in entry_status()
605 	if (!test_bit(Magic, &e->flags)) {  in entry_status()
606 		sprintf(dp, "extension .%s\n", e->magic);  in entry_status()
608 		dp += sprintf(dp, "offset %i\nmagic ", e->offset);  in entry_status()
609 		dp = bin2hex(dp, e->magic, e->size);  in entry_status()
610 		if (e->mask) {  in entry_status()
612 			dp = bin2hex(dp, e->mask, e->size);  in entry_status()
662 	Node *e = inode->i_private;  in bm_evict_inode()  local
666 	if (e) {  in bm_evict_inode()
671 		if (!list_empty(&e->list))  in bm_evict_inode()
672 			list_del_init(&e->list);  in bm_evict_inode()
674 		put_binfmt_handler(e);  in bm_evict_inode()
681  * @e: binary type handler to remove
690 static void remove_binfmt_handler(struct binfmt_misc *misc, Node *e)  in remove_binfmt_handler()  argument
693 	list_del_init(&e->list);  in remove_binfmt_handler()
695 	locked_recursive_removal(e->dentry, NULL);  in remove_binfmt_handler()
703 	Node *e = file_inode(file)->i_private;  in bm_entry_read()  local
711 	entry_status(e, page);  in bm_entry_read()
723 	Node *e = inode->i_private;  in bm_entry_write()  local
729 		clear_bit(Enabled, &e->flags);  in bm_entry_write()
733 		set_bit(Enabled, &e->flags);  in bm_entry_write()
749 		if (!list_empty(&e->list))  in bm_entry_write()
750 			remove_binfmt_handler(i_binfmt_misc(inode), e);  in bm_entry_write()
770 static int add_entry(Node *e, struct super_block *sb)  in add_entry()  argument
772 	struct dentry *dentry = simple_start_creating(sb->s_root, e->name);  in add_entry()
785 	refcount_set(&e->users, 1);  in add_entry()
786 	e->dentry = dentry;  in add_entry()
787 	inode->i_private = e;  in add_entry()
793 	list_add(&e->list, &misc->entries);  in add_entry()
802 	Node *e;  in bm_register_write()  local
807 	e = create_entry(buffer, count);  in bm_register_write()
809 	if (IS_ERR(e))  in bm_register_write()
810 		return PTR_ERR(e);  in bm_register_write()
812 	if (e->flags & MISC_FMT_OPEN_FILE) {  in bm_register_write()
821 			f = open_exec(e->interpreter);  in bm_register_write()
824 				 e->interpreter);  in bm_register_write()
825 			kfree(e);  in bm_register_write()
828 		e->interp_file = f;  in bm_register_write()
831 	err = add_entry(e, sb);  in bm_register_write()
837 		kfree(e);  in bm_register_write()
866 	Node *e, *next;  in bm_status_write()  local
893 		list_for_each_entry_safe(e, next, &misc->entries, list)  in bm_status_write()
894 			remove_binfmt_handler(misc, e);  in bm_status_write()
942 	 * Lazily allocate a new binfmt_misc instance for this namespace, i.e.  in bm_fill_super()