Date: Mon, 22 Jul 2019 21:35:27 -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 1/2] string: Add stracpy and stracpy_pad mechanisms On Mon, 22 Jul 2019 17:38:15 -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 (to) and uses sizeof(to) as the > size. > > These mechanisms verify that the to argument is an array of > char or other compatible types like u8 or unsigned char. > > A BUILD_BUG is emitted when the type of to is not compatible. > It would be nice to include some conversions. To demonstrate the need, to test the code, etc.
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