linux-kernel - Re: [PATCH] xfs: replace strncpy with memcpy in xattr listing

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Message-ID: <20250630145921.GA10009@frogsfrogsfrogs>
Date: Mon, 30 Jun 2025 07:59:21 -0700
From: "Darrick J. Wong" <djwong@...nel.org>
To: Pranav Tyagi <pranav.tyagi03@...il.com>
Cc: cem@...nel.org, skhan@...uxfoundation.org, linux-xfs@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-kernel-mentees@...ts.linux.dev
Subject: Re: [PATCH] xfs: replace strncpy with memcpy in xattr listing

On Tue, Jun 17, 2025 at 06:44:46PM +0530, Pranav Tyagi wrote:
> Use memcpy() in place of strncpy() in __xfs_xattr_put_listent().
> The length is known and a null byte is added manually.
> 
> No functional change intended.
> 
> Signed-off-by: Pranav Tyagi <pranav.tyagi03@...il.com>

'tis better than the three previous attempts at this (compliments on
working out that *name isn't a null terminated string!), so

Reviewed-by: "Darrick J. Wong" <djwong@...nel.org>

--D

> ---
>  fs/xfs/xfs_xattr.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/fs/xfs/xfs_xattr.c b/fs/xfs/xfs_xattr.c
> index 0f641a9091ec..ac5cecec9aa1 100644
> --- a/fs/xfs/xfs_xattr.c
> +++ b/fs/xfs/xfs_xattr.c
> @@ -243,7 +243,7 @@ __xfs_xattr_put_listent(
>  	offset = context->buffer + context->count;
>  	memcpy(offset, prefix, prefix_len);
>  	offset += prefix_len;
> -	strncpy(offset, (char *)name, namelen);			/* real name */
> +	memcpy(offset, (char *)name, namelen);			/* real name */
>  	offset += namelen;
>  	*offset = '\0';
>  
> -- 
> 2.49.0
> 
>