Re: [PATCH v3 00/16] Provide saturating helpers for allocation

[Linus Torvalds]

On Thu, May 31, 2018 at 7:43 PM Kees Cook <keescook@xxxxxxxxxxxx> 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