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UPSTREAM: xdp: Clear grow memory in bpf_xdp_adjust_tail()

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Clearing memory of tail when grow happens, because it is too easy
to write a XDP_PASS program that extend the tail, which expose
this memory to users that can run tcpdump.

Change-Id: I9bec93c668c57dcd66104e1f1989f5036f46cec2
Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Toke Høiland-Jørgensen <toke@redhat.com>
Link: https://lore.kernel.org/bpf/158945349039.97035.5262100484553494.stgit@firesoul
This commit is contained in:
Jesper Dangaard Brouer 2020-05-14 12:51:30 +02:00 • committed by basamaryan
commit e9e42f55b9
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4
net/core/filter.c
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@ -3491,6 +3491,10 @@ BPF_CALL_2(bpf_xdp_adjust_tail, struct xdp_buff *, xdp, int, offset)
if (unlikely(data_end < xdp->data + ETH_HLEN))
return -EINVAL;
/* Clear memory area on grow, can contain uninit kernel memory */
if (offset > 0)
memset(xdp->data_end, 0, offset);
xdp->data_end = data_end;
return 0;