Following reports of skb_segment() hitting a BUG_ON when working on GROed skbs which have their gso_size mangled (e.g. after a bpf_skb_change_proto call), add a reproducer test that mimics the input skbs that lead to the mentioned BUG_ON as in [1]. Currently, this new test *INDEED* hits the BUG_ON, therefore the final patch is to be applied only after skb_segment is fixed. When changing the gso_size of the test skb to its original value (+20 bytes) then the test passes successfully. [1] https://lists.openwall.net/netdev/2019/08/26/110 Cc: Daniel Borkmann <daniel@xxxxxxxxxxxxx> Cc: Eric Dumazet <eric.dumazet@xxxxxxxxx> Cc: Yonghong Song <yhs@xxxxxx> Shmulik Ladkani (2): test_bpf: Refactor test_skb_segment() to allow testing skb_segment() on numerous different skbs test_bpf: Introduce 'gso_linear_no_head_frag' skb_segment test lib/test_bpf.c | 112 +++++++++++++++++++++++++++++++++++++++++++++---- 1 file changed, 103 insertions(+), 9 deletions(-) -- 2.19.1
