From: Eric Dumazet <edumazet@google.com>
Date: Tue, 23 Jul 2019 10:15:38 +0000 (-0700)
Subject: selftests/bpf: add another gso_segs access
X-Git-Tag: v5.15~5753^2~88^2~2^2
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=be69483bf4f3abaaca5d5ba460dbb50239463552;p=platform%2Fkernel%2Flinux-starfive.git

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>
---

diff --git a/tools/testing/selftests/bpf/verifier/ctx_skb.c b/tools/testing/selftests/bpf/verifier/ctx_skb.c
index b0fda28..d438193 100644
--- a/tools/testing/selftests/bpf/verifier/ctx_skb.c
+++ b/tools/testing/selftests/bpf/verifier/ctx_skb.c
@@ -975,6 +975,17 @@
 	.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 = {
 	BPF_MOV64_IMM(BPF_REG_0, 0),