linux-hardening - Re: [RFC PATCH v2] ptp: Add vDSO-style vmclock support

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Message-ID: <202407010838.D45C67B86@keescook>
Date: Mon, 1 Jul 2024 08:39:07 -0700
From: Kees Cook <kees@...nel.org>
To: David Woodhouse <dwmw2@...radead.org>
Cc: Simon Horman <horms@...nel.org>,
	Peter Hilber <peter.hilber@...nsynergy.com>,
	linux-kernel@...r.kernel.org, virtualization@...ts.linux.dev,
	linux-arm-kernel@...ts.infradead.org, linux-rtc@...r.kernel.org,
	"Ridoux, Julien" <ridouxj@...zon.com>, virtio-dev@...ts.linux.dev,
	"Luu, Ryan" <rluu@...zon.com>,
	"Christopher S. Hall" <christopher.s.hall@...el.com>,
	Jason Wang <jasowang@...hat.com>, John Stultz <jstultz@...gle.com>,
	"Michael S. Tsirkin" <mst@...hat.com>, netdev@...r.kernel.org,
	Richard Cochran <richardcochran@...il.com>,
	Stephen Boyd <sboyd@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Xuan Zhuo <xuanzhuo@...ux.alibaba.com>,
	Marc Zyngier <maz@...nel.org>, Mark Rutland <mark.rutland@....com>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Alessandro Zummo <a.zummo@...ertech.it>,
	Alexandre Belloni <alexandre.belloni@...tlin.com>,
	linux-hardening@...r.kernel.org
Subject: Re: [RFC PATCH v2] ptp: Add vDSO-style vmclock support

On Mon, Jul 01, 2024 at 09:02:38AM +0100, David Woodhouse wrote:
> On Sun, 2024-06-30 at 14:28 +0100, Simon Horman wrote:
> > 
> > W=1 allmodconfig builds with gcc-13 flag the following.
> > Reading the documentation of strncpy() in fortify-string.h,
> > I wonder if strscpy() would be more appropriate in this case.
> 
> It's never going to matter in practice, as the buffer is 32 bytes, so
> "vmclock%d" would never get to the end even if was a 64-bit integer.
> 
> But as a matter of hygiene and best practice, yes strscpy() would be
> more appropriate. Fixed in git, thanks.

Thanks! You can even use the 2-argument version. :)

-- 
Kees Cook