linux-kernel - Re: [PATCH] wifi: wlcore: main: replace deprecated strncpy with strscpy

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Message-ID: <169808220419.695306.17268024250828658883.kvalo@kernel.org>
Date:   Mon, 23 Oct 2023 17:30:06 +0000 (UTC)
From:   Kalle Valo <kvalo@...nel.org>
To:     Justin Stitt <justinstitt@...gle.com>
Cc:     linux-wireless@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-hardening@...r.kernel.org,
        Justin Stitt <justinstitt@...gle.com>
Subject: Re: [PATCH] wifi: wlcore: main: replace deprecated strncpy with
 strscpy

Justin Stitt <justinstitt@...gle.com> wrote:

> strncpy() is deprecated for use on NUL-terminated destination strings
> [1] and as such we should prefer more robust and less ambiguous string
> interfaces.
> 
> We expect fw_version strings to be NUL-terminated based on other similar
> assignments:
> 
> wireless/broadcom/brcm80211/brcmsmac/main.c
> 7867:           snprintf(wlc->wiphy->fw_version,
> 7868:                    sizeof(wlc->wiphy->fw_version), "%u.%u", rev, patch);
> 
> wireless/broadcom/b43legacy/main.c
> 1765:   snprintf(wiphy->fw_version, sizeof(wiphy->fw_version), "%u.%u",
> 
> wireless/broadcom/b43/main.c
> 2730:   snprintf(wiphy->fw_version, sizeof(wiphy->fw_version), "%u.%u",
> 
> wireless/intel/iwlwifi/dvm/main.c
> 1465:   snprintf(priv->hw->wiphy->fw_version,
> 1466:            sizeof(priv->hw->wiphy->fw_version),
> 
> wireless/intel/ipw2x00/ipw2100.c
> 5905:   snprintf(info->fw_version, sizeof(info->fw_version), "%s:%d:%s",
> 
> Based on this, NUL-padding is not required.
> 
> A suitable replacement is `strscpy` [2] due to the fact that it
> guarantees NUL-termination on the destination buffer without
> unnecessarily NUL-padding.
> 
> 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
> Cc: linux-hardening@...r.kernel.org
> Signed-off-by: Justin Stitt <justinstitt@...gle.com>
> Reviewed-by: Kees Cook <keescook@...omium.org>

Patch applied to wireless-next.git, thanks.

3f791c60cccd wifi: wlcore: main: replace deprecated strncpy with strscpy

-- 
https://patchwork.kernel.org/project/linux-wireless/patch/20231018-strncpy-drivers-net-wireless-ti-wlcore-main-c-v1-1-1b1055f482a1@google.com/

https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches