netdev - Re: [PATCH v2 7/7] netfilter: xtables: refactor deprecated strncpy

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Message-ID: <20230809202054.GC3325@breakpoint.cc>
Date: Wed, 9 Aug 2023 22:20:54 +0200
From: Florian Westphal <fw@...len.de>
To: Justin Stitt <justinstitt@...gle.com>
Cc: Pablo Neira Ayuso <pablo@...filter.org>,
	Jozsef Kadlecsik <kadlec@...filter.org>,
	Florian Westphal <fw@...len.de>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	linux-hardening@...r.kernel.org, Kees Cook <keescook@...omium.org>,
	netfilter-devel@...r.kernel.org, coreteam@...filter.org,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 7/7] netfilter: xtables: refactor deprecated strncpy

Justin Stitt <justinstitt@...gle.com> wrote:
> Prefer `strscpy_pad` as it's a more robust interface whilst maintaing
> zero-padding behavior.
> 
> There may have existed a bug here due to both `tbl->repl.name` and
> `info->name` having a size of 32 as defined below:
> |  #define XT_TABLE_MAXNAMELEN 32
> 
> This may lead to buffer overreads in some situations -- `strscpy` solves
> this by guaranteeing NUL-termination of the dest buffer.

I don't think we need to use _pad here.