Daniel Borkmann 6d59b7dbf7 bpf, s390x: do not reload skb pointers in non-skb context ... 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. Fixes: 9db7f2b818 ("s390/bpf: recache skb->data/hlen for skb_vlan_push/pop") Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Alexei Starovoitov <ast@kernel.org> Cc: Michael Holzheu <holzheu@linux.vnet.ibm.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org>		2017-12-15 09:19:35 -08:00
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Makefile	s390: add a few more SPDX identifiers	2017-12-05 07:51:09 +01:00
bpf_jit.S	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
bpf_jit.h	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux	2017-11-13 11:47:01 -08:00
bpf_jit_comp.c	bpf, s390x: do not reload skb pointers in non-skb context	2017-12-15 09:19:35 -08:00