Re: [PATCH] mm: disable `vm.max_map_count' sysctl limit

[Michal Hocko]

On Mon 27-11-17 19:32:18, Michal Hocko wrote:
> On Mon 27-11-17 09:25:16, Andi Kleen wrote:
[...]
> > The reason the limit was there originally because it allows a DoS
> > attack against the kernel by filling all unswappable memory up with VMAs.
> 
> We can reduce the effect by accounting vmas to memory cgroups.

As it turned out we already do.
	vm_area_cachep = KMEM_CACHE(vm_area_struct, SLAB_PANIC|SLAB_ACCOUNT);

-- 
Michal Hocko
SUSE Labs