linux-ext4 - Re: [PATCH 1/2] ext4: don't increase iversion counter for ea

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: <20220728155242.byfyjs3oswru7stt@quack3>
Date:   Thu, 28 Jul 2022 17:52:42 +0200
From:   Jan Kara <jack@...e.cz>
To:     Lukas Czerner <lczerner@...hat.com>
Cc:     linux-ext4@...r.kernel.org, jlayton@...nel.org, tytso@....edu,
        linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH 1/2] ext4: don't increase iversion counter for ea_inodes

On Thu 28-07-22 15:39:13, Lukas Czerner wrote:
> ea_inodes are using i_version for storing part of the reference count so
> we really need to leave it alone.
> 
> The problem can be reproduced by xfstest ext4/026 when iversion is
> enabled. Fix it by not calling inode_inc_iversion() for EXT4_EA_INODE_FL
> inodes in ext4_mark_iloc_dirty().
> 
> Signed-off-by: Lukas Czerner <lczerner@...hat.com>

Looks good. Feel free to add:

Reviewed-by: Jan Kara <jack@...e.cz>

								Honza

> ---
>  fs/ext4/inode.c | 7 ++++++-
>  1 file changed, 6 insertions(+), 1 deletion(-)
> 
> diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
> index 84c0eb55071d..b76554124224 100644
> --- a/fs/ext4/inode.c
> +++ b/fs/ext4/inode.c
> @@ -5717,7 +5717,12 @@ int ext4_mark_iloc_dirty(handle_t *handle,
>  	}
>  	ext4_fc_track_inode(handle, inode);
>  
> -	if (IS_I_VERSION(inode))
> +	/*
> +	 * ea_inodes are using i_version for storing reference count, don't
> +	 * mess with it
> +	 */
> +	if (IS_I_VERSION(inode) &&
> +	    !(EXT4_I(inode)->i_flags & EXT4_EA_INODE_FL))
>  		inode_inc_iversion(inode);
>  
>  	/* the do_update_inode consumes one bh->b_count */
> -- 
> 2.35.3
> 
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR