Re: [RFC][PATCH 00/13] Provide saturating helpers for allocation

[Laura Abbott]

On 05/08/2018 05:42 PM, Kees Cook wrote:
> This is a stab at providing three new helpers for allocation size
> calculation:
>
> struct_size(), array_size(), and array3_size().
>
> These are implemented on top of Rasmus's overflow checking functions,
> and the last 8 patches are all treewide conversions of open-coded
> multiplications into the various combinations of the helper functions.
>
> -Kees
Obvious question (that might indicate this deserves documentation?)

What's the difference between

kmalloc_array(cnt, sizeof(struct blah), GFP_KERNEL);

and

kmalloc(array_size(cnt, struct blah), GFP_KERNEL);


and when would you use one over the other?

Thanks,
Laura