diff options
| -rw-r--r-- | net/core/filter.c | 2 | ||||
| -rw-r--r-- | tools/testing/selftests/bpf/progs/tc_bpf2bpf.c | 2 |
2 files changed, 4 insertions, 0 deletions
diff --git a/net/core/filter.c b/net/core/filter.c index 4b0ad74cfff5..54a53fae9e98 100644 --- a/net/core/filter.c +++ b/net/core/filter.c @@ -7943,6 +7943,8 @@ bool bpf_helper_changes_pkt_data(enum bpf_func_id func_id) case BPF_FUNC_xdp_adjust_head: case BPF_FUNC_xdp_adjust_meta: case BPF_FUNC_xdp_adjust_tail: + /* tail-called program could call any of the above */ + case BPF_FUNC_tail_call: return true; default: return false; diff --git a/tools/testing/selftests/bpf/progs/tc_bpf2bpf.c b/tools/testing/selftests/bpf/progs/tc_bpf2bpf.c index 8a0632c37839..79f5087dade2 100644 --- a/tools/testing/selftests/bpf/progs/tc_bpf2bpf.c +++ b/tools/testing/selftests/bpf/progs/tc_bpf2bpf.c @@ -10,6 +10,8 @@ int subprog(struct __sk_buff *skb) int ret = 1; __sink(ret); + /* let verifier know that 'subprog_tc' can change pointers to skb->data */ + bpf_skb_change_proto(skb, 0, 0); return ret; } |