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Date: Wed, 25 Sep 2019 14:50:11 -0700
From: Andrew Morton <akpm@linux-foundation.org>
To: Joe Perches <joe@perches.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
 linux-kernel@vger.kernel.org, Jonathan Corbet <corbet@lwn.net>, Stephen
 Kitt <steve@sk2.org>, Kees Cook <keescook@chromium.org>, Nitin Gote
 <nitin.r.gote@intel.com>, jannh@google.com,
 kernel-hardening@lists.openwall.com, Rasmus Villemoes
 <rasmus.villemoes@prevas.dk>
Subject: Re: [PATCH V2 1/2] string: Add stracpy and stracpy_pad mechanisms
Message-Id: <20190925145011.c80c89b56fcee3060cf87773@linux-foundation.org>
In-Reply-To: <ed4611a4a96057bf8076856560bfbf9b5e95d390.1563889130.git.joe@perches.com>
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	<ed4611a4a96057bf8076856560bfbf9b5e95d390.1563889130.git.joe@perches.com>
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On Tue, 23 Jul 2019 06:51:36 -0700 Joe Perches <joe@perches.com> wrote:

> Several uses of strlcpy and strscpy have had defects because the
> last argument of each function is misused or typoed.
> 
> Add macro mechanisms to avoid this defect.
> 
> stracpy (copy a string to a string array) must have a string
> array as the first argument (dest) and uses sizeof(dest) as the
> count of bytes to copy.
> 
> These mechanisms verify that the dest argument is an array of
> char or other compatible types like u8 or s8 or equivalent.
> 
> A BUILD_BUG is emitted when the type of dest is not compatible.
> 

I'm still reluctant to merge this because we don't have code in -next
which *uses* it.  You did have a patch for that against v1, I believe? 
Please dust it off and send it along?