linux-hardening - Re: [PATCH 80/82] xen-netback: Refactor intentional wrap-around test

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Message-ID: <35ff4947-7863-40da-b0e7-3b84e17c6163@suse.com>
Date: Tue, 23 Jan 2024 08:55:44 +0100
From: Jan Beulich <jbeulich@...e.com>
To: Kees Cook <keescook@...omium.org>
Cc: Wei Liu <wei.liu@...nel.org>, Paul Durrant <paul@....org>,
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
 xen-devel@...ts.xenproject.org, netdev@...r.kernel.org,
 "Gustavo A. R. Silva" <gustavoars@...nel.org>,
 Bill Wendling <morbo@...gle.com>, Justin Stitt <justinstitt@...gle.com>,
 linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH 80/82] xen-netback: Refactor intentional wrap-around test

On 23.01.2024 01:27, Kees Cook wrote:
> --- a/drivers/net/xen-netback/hash.c
> +++ b/drivers/net/xen-netback/hash.c
> @@ -345,7 +345,7 @@ u32 xenvif_set_hash_mapping(struct xenvif *vif, u32 gref, u32 len,
>  		.flags = GNTCOPY_source_gref
>  	}};
>  
> -	if ((off + len < off) || (off + len > vif->hash.size) ||
> +	if ((add_would_overflow(off, len)) || (off + len > vif->hash.size) ||

I'm not maintainer of this code, but if I was I would ask that the
excess parentheses be removed, to improve readability.

Jan