linux-kernel - Re: [PATCH] s390/sclp: replace deprecated strncpy with strtomem

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Message-ID: <202310241652.0A3460C@keescook>
Date:   Tue, 24 Oct 2023 16:57:26 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Justin Stitt <justinstitt@...gle.com>
Cc:     Heiko Carstens <hca@...ux.ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Alexander Gordeev <agordeev@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ux.ibm.com>,
        Sven Schnelle <svens@...ux.ibm.com>,
        linux-s390@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-hardening@...r.kernel.org
Subject: Re: [PATCH] s390/sclp: replace deprecated strncpy with strtomem

On Tue, Oct 24, 2023 at 04:46:04PM -0700, Kees Cook wrote:
> > Instead use strtomem() as `e.id` is already marked as nonstring:
> > |       char id[4] __nonstring;
> 
> I'm surprised the compiler didn't complain about this -- I thought that
> was the point of the __nonstring attribute: to diagnose when used with a
> string function. Hmpf.

Wow. GCC only warns if you call strlen() on it, but literally nothing
else... :(

-- 
Kees Cook