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SubjectRe: [PATCH] mm/vmalloc: randomize vmalloc() allocations
On Wed, Dec 02, 2020 at 08:49:06PM +0200, Topi Miettinen wrote:
> On 1.12.2020 23.45, Topi Miettinen wrote:
> > Memory mappings inside kernel allocated with vmalloc() are in
> > predictable order and packed tightly toward the low addresses. With
> > new kernel boot parameter 'randomize_vmalloc=1', the entire area is
> > used randomly to make the allocations less predictable and harder to
> > guess for attackers.
> >
>
> This also seems to randomize module addresses. I was going to check that
> next, so nice surprise!

Heh, that's because module_alloc() uses vmalloc() in that way or another :)

> -Topi
>
> > spin_unlock(&free_vmap_area_lock);
> > if (unlikely(addr == vend))
> >
>

--
Sincerely yours,
Mike.

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