linux-kernel - [PATCH v3 0/2] wifi: brcm80211: replace deprecated strncpy

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Message-ID: <20231017-strncpy-drivers-net-wireless-broadcom-brcm80211-brcmfmac-cfg80211-c-v3-0-af780d74ae38@google.com>
Date:   Tue, 17 Oct 2023 20:11:27 +0000
From:   Justin Stitt <justinstitt@...gle.com>
To:     Arend van Spriel <aspriel@...il.com>,
        Franky Lin <franky.lin@...adcom.com>,
        Hante Meuleman <hante.meuleman@...adcom.com>,
        Kalle Valo <kvalo@...nel.org>
Cc:     linux-wireless@...r.kernel.org,
        brcm80211-dev-list.pdl@...adcom.com,
        SHA-cyfmac-dev-list@...ineon.com, linux-kernel@...r.kernel.org,
        linux-hardening@...r.kernel.org,
        Justin Stitt <justinstitt@...gle.com>
Subject: [PATCH v3 0/2] wifi: brcm80211: replace deprecated strncpy

Hi,

This series used to be just one patch in [v2] but I've split it into two
separate patches.

The motivation behind this series is that strncpy() is deprecated for
use on NUL-terminated destination strings [1] and as such we should
prefer more robust and less ambiguous string interfaces.

In cases where we expect the destination buffer to be NUL-terminated
let's opt for strscpy() as this guarantees NUL-termination. Other cases
are just simple byte copies with pre-determined bounds; for these let's
use plain-ol' memcpy().

Each change is detailed in its accompanying patch message.

Link: https://www.kernel.org/doc/html/latest/process/deprecated.html#strncpy-on-nul-terminated-strings [1]
Link: https://manpages.debian.org/testing/linux-manual-4.8/strscpy.9.en.html [2]
Link: https://github.com/KSPP/linux/issues/90
Signed-off-by: Justin Stitt <justinstitt@...gle.com>
---
Changes in v3:
- split up into two separate patches (thanks Franky)
- use better subject line (thanks Franky + Kalle)
- Link to v2: https://lore.kernel.org/r/20231016-strncpy-drivers-net-wireless-broadcom-brcm80211-brcmfmac-cfg80211-c-v2-1-6c7567e1d3b8@google.com

Changes in v2:
- add other strncpy replacements
- Link to v1: https://lore.kernel.org/r/20231016-strncpy-drivers-net-wireless-broadcom-brcm80211-brcmfmac-cfg80211-c-v1-1-4234807ca07e@google.com

---
Justin Stitt (2):
      wifi: brcm80211: replace deprecated strncpy with strscpy
      wifi: brcmsmac: replace deprecated strncpy with memcpy

 drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c | 2 +-
 drivers/net/wireless/broadcom/brcm80211/brcmfmac/p2p.c      | 2 +-
 drivers/net/wireless/broadcom/brcm80211/brcmsmac/channel.c  | 6 +++---
 drivers/net/wireless/broadcom/brcm80211/brcmsmac/dma.c      | 3 +--
 drivers/net/wireless/broadcom/brcm80211/brcmsmac/main.c     | 4 ++--
 5 files changed, 8 insertions(+), 9 deletions(-)
---
base-commit: cbf3a2cb156a2c911d8f38d8247814b4c07f49a2
change-id: 20231016-strncpy-drivers-net-wireless-broadcom-brcm80211-brcmfmac-cfg80211-c-a20108421685

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