linux-kernel - Re: [RESEND PATCH v9] ext4: Log error when lookup of encoded dentry fails

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Message-ID: <87le7uvkx0.fsf@mailhost.krisman.be>
Date: Thu, 08 Feb 2024 14:02:51 -0500
From: Gabriel Krisman Bertazi <krisman@...e.de>
To: Eugen Hristev <eugen.hristev@...labora.com>
Cc: tytso@....edu,  adilger.kernel@...ger.ca,  linux-ext4@...r.kernel.org,
  linux-kernel@...r.kernel.org,  kernel@...labora.co,  Gabriel Krisman
 Bertazi <krisman@...labora.com>,  Eric Biggers <ebiggers@...gle.com>
Subject: Re: [RESEND PATCH v9] ext4: Log error when lookup of encoded dentry
 fails

Eugen Hristev <eugen.hristev@...labora.com> writes:

> From: Gabriel Krisman Bertazi <krisman@...labora.com>
>
> If the volume is in strict mode, ext4_ci_compare can report a broken
> encoding name.  This will not trigger on a bad lookup, which is caught
> earlier, only if the actual disk name is bad.
>
> Reviewed-by: Eric Biggers <ebiggers@...gle.com>
> Signed-off-by: Gabriel Krisman Bertazi <krisman@...labora.com>
> Signed-off-by: Eugen Hristev <eugen.hristev@...labora.com>

Reviewed-by: Gabriel Krisman Bertazi <krisman@...e.de>

> ---
> Hello,
>
> I am trying to respin the series here :
> https://www.spinics.net/lists/linux-ext4/msg85081.html
>
> To make it easier to apply I split it into smaller chunks which address
> one single thing.
>
> This patch simply adds an error message in the UNICODE path.
>
>  fs/ext4/namei.c | 3 +++
>  1 file changed, 3 insertions(+)
>
> diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
> index 6e7af8dc4dde..7d357c417475 100644
> --- a/fs/ext4/namei.c
> +++ b/fs/ext4/namei.c
> @@ -1477,6 +1477,9 @@ static bool ext4_match(struct inode *parent,
>  			 * only case where it happens is on a disk
>  			 * corruption or ENOMEM.
>  			 */
> +			if (ret == -EINVAL)
> +				EXT4_ERROR_INODE(parent,
> +					"Directory contains filename that is invalid UTF-8");
>  			return false;
>  		}
>  		return ret;

-- 
Gabriel Krisman Bertazi