netdev - Re: [2/3] powerpc: bpf: flush the entire JIT buffer

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Date:   Fri, 27 Jan 2017 11:40:33 +1100 (AEDT)
From:   Michael Ellerman <patch-notifications@...erman.id.au>
To:     "Naveen N. Rao" <naveen.n.rao@...ux.vnet.ibm.com>
Cc:     netdev@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        davem@...emloft.net, daniel@...earbox.net, ast@...com
Subject: Re: [2/3] powerpc: bpf: flush the entire JIT buffer

On Fri, 2017-01-13 at 17:10:01 UTC, "Naveen N. Rao" wrote:
> With bpf_jit_binary_alloc(), we allocate at a page granularity and fill
> the rest of the space with illegal instructions to mitigate BPF spraying
> attacks, while having the actual JIT'ed BPF program at a random location
> within the allocated space. Under this scenario, it would be better to
> flush the entire allocated buffer rather than just the part containing
> the actual program. We already flush the buffer from start to the end of
> the BPF program. Extend this to include the illegal instructions after
> the BPF program.
> 
> Signed-off-by: Naveen N. Rao <naveen.n.rao@...ux.vnet.ibm.com>
> Acked-by: Alexei Starovoitov <ast@...nel.org>
> Acked-by: Daniel Borkmann <daniel@...earbox.net>

Applied to powerpc next, thanks.

https://git.kernel.org/powerpc/c/10528b9c45cfb9e8f45217ef2f5ef8

cheers