linux-kernel - Re: [PATCH v2 1/4] ext4: add EXT4_INODE_HAVE_XATTR

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Message-ID: <20220615124633.6uddzv5msnmwi7c4@quack3.lan>
Date:   Wed, 15 Jun 2022 14:46:33 +0200
From:   Jan Kara <jack@...e.cz>
To:     Baokun Li <libaokun1@...wei.com>
Cc:     linux-ext4@...r.kernel.org, tytso@....edu,
        adilger.kernel@...ger.ca, jack@...e.cz, ritesh.list@...il.com,
        lczerner@...hat.com, enwlinux@...il.com,
        linux-kernel@...r.kernel.org, yi.zhang@...wei.com,
        yebin10@...wei.com, yukuai3@...wei.com
Subject: Re: [PATCH v2 1/4] ext4: add EXT4_INODE_HAVE_XATTR_SPACE macro in
 xattr.h

On Wed 15-06-22 12:06:27, Baokun Li wrote:
> When adding an xattr to an inode, we must ensure that the inode_size is
> not less than EXT4_GOOD_OLD_INODE_SIZE + extra_isize + pad. Otherwise,
> the end position may be greater than the start position, resulting in UAF.
> 
> Signed-off-by: Baokun Li <libaokun1@...wei.com>

...

> +/*
> + * If we want to add an xattr to the inode, we should make sure that
> + * i_extra_isize is not 0 and that the inode size is not less than
> + * EXT4_GOOD_OLD_INODE_SIZE + extra_isize + pad.
> + *   EXT4_GOOD_OLD_INODE_SIZE   extra_isize header   entry   pad  data
> + * |--------------------------|------------|------|---------|---|-------|
> + */
> +#define EXT4_INODE_HAVE_XATTR_SPACE(inode)				\

Gramatically correct would be EXT4_INODE_**HAS**_XATTR_SPACE and I'd be for
using that. Otherwise the whole series looks good so feel free to add:

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

								Honza
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR