linux-kernel - [PATCH v2 0/7] netfilter: refactor deprecated strncpy

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Date:   Wed, 09 Aug 2023 01:06:03 +0000
From:   Justin Stitt <justinstitt@...gle.com>
To:     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>
Cc:     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,
        Justin Stitt <justinstitt@...gle.com>
Subject: [PATCH v2 0/7] netfilter: refactor deprecated strncpy

`strncpy` is deprecated for use on NUL-terminated destination strings [1].

A suitable replacement is `strscpy` or `strscpy_pad` [2] due to the fact
that they guarantee NUL-termination on their destination buffer argument
which is _not_ the case for `strncpy`!

This series of patches aims to swap out `strncpy` for more a robust and
less ambiguous interface `strscpy_pad` . This patch series, if applied
in its entirety, removes most if not all instances of `strncpy` in the
`net/netfilter` directory.

[1]: www.kernel.org/doc/html/latest/process/deprecated.html#strncpy-on-nul-terminated-strings
[2]: https://manpages.debian.org/testing/linux-manual-4.8/strscpy.9.en.html

Link: https://github.com/KSPP/linux/issues/90
Related: commit 8556bceb9c40 ("netfilter: move from strlcpy with unused retval to strscpy")
---
Changes in v2:
- use `strscpy_pad` instead of `strscpy` since zero-padding is needed
  (thanks Florian and Kees)
- Link to v1: https://lore.kernel.org/r/20230808-net-netfilter-v1-0-efbbe4ec60af@google.com

---
Justin Stitt (7):
      netfilter: ipset: refactor deprecated strncpy
      netfilter: nf_tables: refactor deprecated strncpy
      netfilter: nf_tables: refactor deprecated strncpy
      netfilter: nft_meta: refactor deprecated strncpy
      netfilter: nft_osf: refactor deprecated strncpy
      netfilter: x_tables: refactor deprecated strncpy
      netfilter: xtables: refactor deprecated strncpy

 net/netfilter/ipset/ip_set_core.c | 10 +++++-----
 net/netfilter/nft_ct.c            |  2 +-
 net/netfilter/nft_fib.c           |  2 +-
 net/netfilter/nft_meta.c          |  6 +++---
 net/netfilter/nft_osf.c           |  6 +++---
 net/netfilter/x_tables.c          |  5 ++---
 net/netfilter/xt_repldata.h       |  2 +-
 7 files changed, 16 insertions(+), 17 deletions(-)
---
base-commit: 14f9643dc90adea074a0ffb7a17d337eafc6a5cc
change-id: 20230807-net-netfilter-4027219bb6e7

Best regards,
--
Justin Stitt <justinstitt@...gle.com>