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Date: Thu, 31 May 2018 19:54:18 -0500
From: Linus Torvalds <torvalds@...ux-foundation.org>
To: Kees Cook <keescook@...omium.org>
Cc: Matthew Wilcox <mawilcox@...rosoft.com>, Rasmus Villemoes <linux@...musvillemoes.dk>,
Matthew Wilcox <willy@...radead.org>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, linux-mm <linux-mm@...ck.org>,
Kernel Hardening <kernel-hardening@...ts.openwall.com>
Subject: Re: [PATCH v3 00/16] Provide saturating helpers for allocation
On Thu, May 31, 2018 at 7:43 PM Kees Cook <keescook@...omium.org> wrote:
>
> So, while nothing does:
> kmalloc_array(a, b, ...) -> kmalloc(array_size(a, b), ...)
> the treewide changes DO perform changes like this:
> kmalloc(a * b, ...) -> kmalloc(array_size(a, b), ...)
Ugh. I really really still absolutely despise this.
Why can't you just have a separate set of coccinelle scripts that do
the simple and clean cases?
So *before* doing any array_size() conversions, just do
kzalloc(a*b, ...) -> kcalloc(a, b, ...)
kmalloc(a*b,..) -> kmalloc_array(a,b, ...)
and the obvious variations on that (devm_xyz() has all the same helpers).
Only after doing the ones that don't have the nice obvious helpers, do
the remaining ones with array_size(), ie
*alloc(a*b, ..) -> *alloc(array_size(a,b), ...)
because that really makes for much less legible code.
Hmm?
Linus
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