Date: Wed, 25 Sep 2019 14:50:11 -0700 From: Andrew Morton <akpm@...ux-foundation.org> To: Joe Perches <joe@...ches.com> Cc: Linus Torvalds <torvalds@...ux-foundation.org>, linux-kernel@...r.kernel.org, Jonathan Corbet <corbet@....net>, Stephen Kitt <steve@....org>, Kees Cook <keescook@...omium.org>, Nitin Gote <nitin.r.gote@...el.com>, jannh@...gle.com, kernel-hardening@...ts.openwall.com, Rasmus Villemoes <rasmus.villemoes@...vas.dk> Subject: Re: [PATCH V2 1/2] string: Add stracpy and stracpy_pad mechanisms On Tue, 23 Jul 2019 06:51:36 -0700 Joe Perches <joe@...ches.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?
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