linux-ext4 - Re: Mixup with name_len & file

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Date:	Tue, 5 Mar 2013 13:29:46 -0500
From:	Theodore Ts'o <tytso@....edu>
To:	Jan Kara <jack@...e.cz>
Cc:	linux-ext4@...r.kernel.org
Subject: Re: Mixup with name_len & file_type in e2fsprogs

On Tue, Mar 05, 2013 at 01:18:56PM +0100, Jan Kara wrote:
>   Hello,
> 
>   I was looking into a bug where application using e2fslib was complaining
> about file_type > 7. Now the problem is that this is on big endian system
> and ext2fs_dir_iterate() ends up calling ext2fs_dirent_swab_in() without
> EXT2_DIRBLOCK_V2_STRUCT flag set so name_len is treated as 2 byte and
> swapped.

Well, the application most be passing a pointer to treating a pointer
to a struct ext2_dir_entry as a struct dir_entry_2, right?  So it's
technically doing something wrong it sounds like.

The ext2_dir_entry_2 was probably a mistake, and it's hardly used at
all in e2fsprogs.  I wonder if we would be better off not trying to
support it at all, and perhaps adding better accessor functions for
struct ext2_dir_entry instead.

						- Ted
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