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selftests/bpf: add another gso_segs access 

Use BPF_REG_1 for source and destination of gso_segs read,
to exercise "bpf: fix access to skb_shared_info->gso_segs" fix.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Suggested-by: Stanislav Fomichev <sdf@google.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Eric Dumazet 2019-07-23 03:15:38 -07:00 committed by Alexei Starovoitov
parent 06a22d897d
commit be69483bf4
1 changed files with 11 additions and 0 deletions
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11
tools/testing/selftests/bpf/verifier/ctx_skb.c
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@ -974,6 +974,17 @@
.result = ACCEPT,
.prog_type = BPF_PROG_TYPE_CGROUP_SKB,
},
{
"read gso_segs from CGROUP_SKB",
.insns = {
BPF_LDX_MEM(BPF_W, BPF_REG_1, BPF_REG_1,
offsetof(struct __sk_buff, gso_segs)),
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
.result = ACCEPT,
.prog_type = BPF_PROG_TYPE_CGROUP_SKB,
},
{
"write gso_segs from CGROUP_SKB",
.insns = {