linux-hardening - Re: [PATCH v2 1/7] netfilter: ipset: refactor deprecated strncpy

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Date:   Wed, 9 Aug 2023 14:40:39 -0700
From:   Justin Stitt <justinstitt@...gle.com>
To:     Florian Westphal <fw@...len.de>
Cc:     Pablo Neira Ayuso <pablo@...filter.org>,
        Jozsef Kadlecsik <kadlec@...filter.org>,
        "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 1/7] netfilter: ipset: refactor deprecated strncpy

On Wed, Aug 9, 2023 at 1:19 PM Florian Westphal <fw@...len.de> wrote:
>
> Justin Stitt <justinstitt@...gle.com> wrote:
> > Use `strscpy_pad` instead of `strncpy`.
>
> I don't think that any of these need zero-padding.
It's a more consistent change with the rest of the series and I don't
believe it has much different behavior to `strncpy` (other than
NUL-termination) as that will continue to pad to `n` as well.

Do you think the `_pad` for 1/7, 6/7 and 7/7 should be changed back to
`strscpy` in a v3? I really am shooting in the dark as it is quite
hard to tell whether or not a buffer is expected to be NUL-padded or
not.