On Wed, Dec 02, 2020 at 08:49:06PM +0200, Topi Miettinen wrote:

On 1.12.2020 23.45, Topi Miettinen wrote:

quoted

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

quoted

  	spin_unlock(&free_vmap_area_lock);
  	if (unlikely(addr == vend))

-- 
Sincerely yours,
Mike.