linux-hardening - Re: [PATCH] i2c: cp2615: replace deprecated strncpy with strscpy

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Message-ID: <ZQ1oJB0Tiop3Z1Fv@shikoro>
Date: Fri, 22 Sep 2023 12:10:44 +0200
From: Wolfram Sang <wsa@...nel.org>
To: Justin Stitt <justinstitt@...gle.com>
Cc: Bence Csókás <bence98@....bme.hu>,
	Andi Shyti <andi.shyti@...nel.org>, linux-i2c@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH] i2c: cp2615: replace deprecated strncpy with strscpy

On Wed, Sep 20, 2023 at 08:08:52AM +0000, Justin Stitt wrote:
> `strncpy` is deprecated for use on NUL-terminated destination strings [1].
> 
> We should prefer more robust and less ambiguous string interfaces.
> 
> We expect name to be NUL-terminated based on its numerous uses with
> functions that expect NUL-terminated strings.
> 
> For example in i2c-core-base.c +1533:
> | dev_dbg(&adap->dev, "adapter [%s] registered\n", adap->name);
> 
> NUL-padding is not required as `adap` is already zero-alloacted with:
> | adap = devm_kzalloc(&usbif->dev, sizeof(struct i2c_adapter), GFP_KERNEL);
> 
> With the above in mind, 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>

Applied to for-next, thanks!


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