netdev - Re: [PATCH 1/7] netfilter: ipset: refactor deprecated strncpy

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Date: Wed, 9 Aug 2023 01:38:55 +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 1/7] netfilter: ipset: refactor deprecated strncpy

Justin Stitt <justinstitt@...gle.com> wrote:
> Fixes several buffer overread bugs present in `ip_set_core.c` by using
> `strscpy` over `strncpy`.
> 
> Link: https://github.com/KSPP/linux/issues/90
> Cc: linux-hardening@...r.kernel.org
> Signed-off-by: Justin Stitt <justinstitt@...gle.com>
> 
> ---
> There exists several potential buffer overread bugs here. These bugs
> exist due to the fact that the destination and source strings may have
> the same length which is equal to the max length `IPSET_MAXNAMELEN`.

There is no truncation.  Inputs are checked via nla_policy:

[IPSET_ATTR_SETNAME2]   = { .type = NLA_NUL_STRING, .len = IPSET_MAXNAMELEN - 1 },