linux-kernel - Re: [PATCH] erofs: add error log in erofs_fc_parse

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: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <649afa9b-5724-4b52-8b9b-9a82a3c1468b@linux.alibaba.com>
Date: Fri, 17 Jan 2025 17:28:13 +0800
From: Gao Xiang <hsiangkao@...ux.alibaba.com>
To: Chen Linxuan <chenlinxuan@...ontech.com>, Gao Xiang <xiang@...nel.org>,
 Chao Yu <chao@...nel.org>, Yue Hu <zbestahu@...il.com>,
 Jeffle Xu <jefflexu@...ux.alibaba.com>, Sandeep Dhavale <dhavale@...gle.com>
Cc: linux-erofs@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] erofs: add error log in erofs_fc_parse_param

Hi Linxuan,

On 2025/1/17 16:52, Chen Linxuan wrote:
> While reading erofs code, I notice that `erofs_fc_parse_param` will
> return -ENOPARAM, which means that erofs do not support this option,
> without report anything when `fs_parse` return an unknown `opt`.
> 
> But if an option is unknown to erofs, I mean that option not in
> `erofs_fs_parameters` at all, `fs_parse` will return -ENOPARAM,
> which means that `erofs_fs_parameters` should has returned earlier.
> 
> Entering `default` means `fs_parse` return something we unexpected.
> I am not sure about it but I think we should return -EINVAL here,
> just like `xfs_fs_parse_param`.
> 
> Signed-off-by: Chen Linxuan <chenlinxuan@...ontech.com>

I think the default branch is actually deadcode here, see
erofs_fc_parse_param() -> fs_parse() -> fs_lookup_key() -> -ENOPARAM

then vfs_parse_fs_param() will show "Unknown parameter".

Maybe we could just kill `default:` branch...

Thanks,
Gao Xiang


> ---
>   fs/erofs/super.c | 3 ++-
>   1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/fs/erofs/super.c b/fs/erofs/super.c
> index 1fc5623c3a4d..67fc4c1deb98 100644
> --- a/fs/erofs/super.c
> +++ b/fs/erofs/super.c
> @@ -509,7 +509,8 @@ static int erofs_fc_parse_param(struct fs_context *fc,
>   #endif
>   		break;
>   	default:
> -		return -ENOPARAM;
> +		errorfc(fc, "%s option not supported", param->key);
> +		return -EINVAL;
>   	}
>   	return 0;
>   }