[PATCH v2 1/4] mm: security: introduce init_on_alloc=1 and init_on_free=1 boot options

[Kees Cook]

On Tue, May 14, 2019 at 04:35:34PM +0200, Alexander Potapenko wrote:
> [...]
> diff --git a/mm/slab.h b/mm/slab.h
> index 43ac818b8592..24ae887359b8 100644
> --- a/mm/slab.h
> +++ b/mm/slab.h
> @@ -524,4 +524,20 @@ static inline int cache_random_seq_create(struct kmem_cache *cachep,
> [...]
> +static inline bool slab_want_init_on_free(struct kmem_cache *c)
> +{
> +	if (static_branch_unlikely(&init_on_free))
> +		return !(c->ctor);

BTW, why is this checking for c->ctor here? Shouldn't it not matter for
the free case?

> +	else
> +		return false;
> +}

-- 
Kees Cook