Am Thu, 14 Dec 2017 21:07:23 +0100 schrieb Daniel Borkmann <dan...@iogearbox.net>:
> The assumption of unconditionally reloading skb pointers on > BPF helper calls where bpf_helper_changes_pkt_data() holds > true is wrong. There can be different contexts where the > BPF helper would enforce a reload such as in case of XDP. > Here, we do have a struct xdp_buff instead of struct sk_buff > as context, thus this will access garbage. > > JITs only ever need to deal with cached skb pointer reload > when ld_abs/ind was seen, therefore guard the reload behind > SEEN_SKB only. Tested on s390x. Hello Daniel, Sorry for the late answer - I have been on vacation up to now. Thanks for fixing / testing this for s390x. Michael
