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

[Michal Hocko]

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