Re: [PATCH] mm/slab_common.c: fix possible spectre-v1 in kmalloc_slab()

Michal Hocko
2019-05-29T16:25:37Z

On Wed 29-05-19 20:37:28, Dianzhang Chen wrote:
[...]
> @@ -1056,6 +1057,7 @@ struct kmem_cache *kmalloc_slab(size_t size, gfp_t flags)
> if (!size)
> return ZERO_SIZE_PTR;
>
> + size = array_index_nospec(size, 193);
> index = size_index[size_index_elem(size)];

What is this 193 magic number?
--
Michal Hocko
SUSE Labs