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

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Message-ID: <57de3897-3428-c241-2d1e-13d42a037864@huawei.com>
Date:   Thu, 16 Jun 2022 09:06:55 +0800
From:   Baokun Li <libaokun1@...wei.com>
To:     Jan Kara <jack@...e.cz>
CC:     <linux-ext4@...r.kernel.org>, <tytso@....edu>,
        <adilger.kernel@...ger.ca>, <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>,
        Baokun Li <libaokun1@...wei.com>
Subject: Re: [PATCH v2 1/4] ext4: add EXT4_INODE_HAVE_XATTR_SPACE macro in
 xattr.h

在 2022/6/15 20:46, Jan Kara 写道:
> 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

I'm sorry, I didn't notice it was "HAS." Thank you very much for your 
correction.

I will send a patch V3 with the changes suggested by you. Thanks again!

-- 
With Best Regards,
Baokun Li
.