linux-kernel - Re: [PATCH 2/3] fs/ntfs3: Reject mount if boot's cluster size

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Message-ID: <20210927185621.2wkznecc4jndja6b@kari-VirtualBox>
Date:   Mon, 27 Sep 2021 21:56:21 +0300
From:   Kari Argillander <kari.argillander@...il.com>
To:     Konstantin Komarov <almaz.alexandrovich@...agon-software.com>
Cc:     ntfs3@...ts.linux.dev, linux-kernel@...r.kernel.org,
        linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH 2/3] fs/ntfs3: Reject mount if boot's cluster size <
 media sector size

On Mon, Sep 27, 2021 at 06:48:00PM +0300, Konstantin Komarov wrote:
> If we continue to work in this case, then we can corrupt fs.
> 

Should have fixes tag.

> Signed-off-by: Konstantin Komarov <almaz.alexandrovich@...agon-software.com>
> ---
>  fs/ntfs3/super.c | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/fs/ntfs3/super.c b/fs/ntfs3/super.c
> index 7099d9b1f3aa..193f9a98f6ab 100644
> --- a/fs/ntfs3/super.c
> +++ b/fs/ntfs3/super.c
> @@ -763,9 +763,14 @@ static int ntfs_init_from_boot(struct super_block *sb, u32 sector_size,
>  	sbi->mft.lbo = mlcn << sbi->cluster_bits;
>  	sbi->mft.lbo2 = mlcn2 << sbi->cluster_bits;
>  
> +	/* Compare boot's cluster and sector. */

Pretty random obvious comment and I do not know what this does in this
patch.

>  	if (sbi->cluster_size < sbi->sector_size)
>  		goto out;
>  
> +	/* Compare boot's cluster and media sector. */
> +	if (sbi->cluster_size < sector_size)
> +		goto out; /* No way to use ntfs_get_block in this case. */

Usually comment should not go after line. If you take chunk from patch
3/3 then this is not issue.

> +
>  	sbi->cluster_mask = sbi->cluster_size - 1;
>  	sbi->cluster_mask_inv = ~(u64)sbi->cluster_mask;
>  	sbi->record_size = record_size = boot->record_size < 0
> -- 
> 2.33.0
> 
> 
>