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

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