Messages in this thread | | | Date | Sun, 19 May 2013 23:56:15 -0700 (PDT) | Subject | Re: [PATCH net-next] x86: bpf_jit_comp: secure bpf jit against spraying attacks | From | David Miller <> |
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From: Eric Dumazet <eric.dumazet@gmail.com> Date: Fri, 17 May 2013 19:37:03 -0700
> From: Eric Dumazet <edumazet@google.com> > > hpa bringed into my attention some security related issues > with BPF JIT on x86. > > This patch makes sure the bpf generated code is marked read only, > as other kernel text sections. > > It also splits the unused space (we vmalloc() and only use a fraction of > the page) in two parts, so that the generated bpf code not starts at a > known offset in the page, but a pseudo random one. > > Refs: > http://mainisusuallyafunction.blogspot.com/2012/11/attacking-hardened-linux-systems-with.html > > Reported-by: H. Peter Anvin <hpa@zytor.com> > Signed-off-by: Eric Dumazet <edumazet@google.com>
Applied.
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