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Message-ID: <202312080923.7F537BE03D@keescook> Date: Fri, 8 Dec 2023 09:23:51 -0800 From: Kees Cook <keescook@...omium.org> To: Justin Stitt <justinstitt@...gle.com> Cc: Andrew Lunn <andrew@...n.ch>, Heiner Kallweit <hkallweit1@...il.com>, Russell King <linux@...linux.org.uk>, "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org, linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org Subject: Re: [PATCH v2] net: mdio_bus: replace deprecated strncpy with strscpy On Thu, Dec 07, 2023 at 09:57:50PM +0000, Justin Stitt 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 mdiodev->modalias to be NUL-terminated based on its usage with > strcmp(): > | return strcmp(mdiodev->modalias, drv->name) == 0; > > Moreover, mdiodev->modalias is already zero-allocated: > | mdiodev = kzalloc(sizeof(*mdiodev), GFP_KERNEL); > ... which means the NUL-padding strncpy provides is not necessary. > > Considering the above, 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> Yeah, the subject is distinct now. :) Reviewed-by: Kees Cook <keescook@...omium.org> -- Kees Cook
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