linux-kernel - Re: [PATCH V4] ext4: check hash version and filesystem casefolded consistent

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Date: Fri, 31 May 2024 11:55:19 -0700
From: Eric Biggers <ebiggers@...nel.org>
To: Lizhi Xu <lizhi.xu@...driver.com>
Cc: lkp@...el.com, coreteam@...filter.org, davem@...emloft.net,
	fw@...len.de, jaegeuk@...nel.org, kadlec@...filter.org,
	kuba@...nel.org, linux-fscrypt@...r.kernel.org,
	linux-kernel@...r.kernel.org, llvm@...ts.linux.dev,
	netdev@...r.kernel.org, netfilter-devel@...r.kernel.org,
	oe-kbuild-all@...ts.linux.dev, pablo@...filter.org,
	syzbot+340581ba9dceb7e06fb3@...kaller.appspotmail.com,
	syzkaller-bugs@...glegroups.com, tytso@....edu
Subject: Re: [PATCH V4] ext4: check hash version and filesystem casefolded
 consistent

On Fri, May 31, 2024 at 05:06:11PM +0800, 'Lizhi Xu' via syzkaller-bugs wrote:
> When mounting the ext4 filesystem, if the hash version and casefolded are not
> consistent, exit the mounting.
> 
> Reported-by: syzbot+340581ba9dceb7e06fb3@...kaller.appspotmail.com
> Signed-off-by: Lizhi Xu <lizhi.xu@...driver.com>
> ---
>  fs/ext4/super.c | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/fs/ext4/super.c b/fs/ext4/super.c
> index c682fb927b64..0ad326504c50 100644
> --- a/fs/ext4/super.c
> +++ b/fs/ext4/super.c
> @@ -5262,6 +5262,11 @@ static int __ext4_fill_super(struct fs_context *fc, struct super_block *sb)
>  		goto failed_mount;
>  
>  	ext4_hash_info_init(sb);
> +	if (es->s_def_hash_version == DX_HASH_SIPHASH && 
> +	    !ext4_has_feature_casefold(sb)) {
> +		err = -EINVAL;
> +		goto failed_mount;
> +	}

For the third time: you need to use the correct mailing lists.
Please follow Documentation/process/submitting-patches.rst.

- Eric