linux-ext4 - Re: [PATCH] ext3: set i_extra

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <0347DFC8-03A9-45DF-9B9F-ED4005720C49@dilger.ca>
Date:	Fri, 20 Aug 2010 01:42:25 -0600
From:	Andreas Dilger <adilger@...ger.ca>
To:	Masayoshi MIZUMA <m.mizuma@...fujitsu.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>, Jan Kara <jack@...e.cz>,
	linux-ext4 development <linux-ext4@...r.kernel.org>
Subject: Re: [PATCH] ext3: set i_extra_isize of 11th inode

On 2010-08-19, at 20:20, Masayoshi MIZUMA wrote:
> In ext3 filesystem, if following conditions 1., 2., 3. and 4. is satisfied,
> getfattr can't search the extended attribute (EA) after remount.
> 
> This happens because of following logic:
>    i_extra_isize is set to over 0 by ext3_new_inode() when we create
>    a file whose inode number is 11 after removing "lost+found". 
>    Therefore setfattr creates the EA in-inode.
>    After remount, i_extra_isize of 11th inode is set to 0 by ext3_iget()
>    when we lookup the file, so getfattr tries to search the EA out-inode.
>    However, the EA locates in-inode, so getfattr can't search the EA.

This was a workaround for a bug in mke2fs a couple of years ago, and is probably no longer needed.

> @@ -2881,8 +2881,7 @@ struct inode *ext3_iget(struct super_block *sb, unsigned long ino)
> 		atomic_set(&ei->i_datasync_tid, tid);
> 	}
> 
> -	if (inode->i_ino >= EXT3_FIRST_INO(inode->i_sb) + 1 &&
> -	    EXT3_INODE_SIZE(inode->i_sb) > EXT3_GOOD_OLD_INODE_SIZE) {
> +	if (EXT3_INODE_SIZE(inode->i_sb) > EXT3_GOOD_OLD_INODE_SIZE) {
> 		/*
> 		 * When mke2fs creates big inodes it does not zero out
> 		 * the unused bytes above EXT3_GOOD_OLD_INODE_SIZE,

This should also remove the above comment, which is no longer relevant.


Cheers, Andreas





--
To unsubscribe from this list: send the line "unsubscribe linux-ext4" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html