bpf: sk_msg, add tests for size field

This adds tests to read the size field to test_verifier.

Signed-off-by: John Fastabend <john.fastabend@gmail.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>

1 files changed, 13 insertions, 3 deletions

diff --git a/tools/testing/selftests/bpf/test_verifier.c b/tools/testing/selftests/bpf/test_verifier.c
index cf242734e2eb..7865b94c02c4 100644
--- a/tools/testing/selftests/bpf/test_verifier.c
+++ b/tools/testing/selftests/bpf/test_verifier.c
@@ -1843,10 +1843,20 @@ static struct bpf_test tests[] = {
                 .prog_type = BPF_PROG_TYPE_SK_SKB,
         },
         {
-                "invalid 64B read of family in SK_MSG",
+                "valid access size in SK_MSG",
+                .insns = {
+                        BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_1,
+                                    offsetof(struct sk_msg_md, size)),
+                        BPF_EXIT_INSN(),
+                },
+                .result = ACCEPT,
+                .prog_type = BPF_PROG_TYPE_SK_MSG,
+        },
+        {
+                "invalid 64B read of size in SK_MSG",
                 .insns = {
                         BPF_LDX_MEM(BPF_DW, BPF_REG_2, BPF_REG_1,
-                                    offsetof(struct sk_msg_md, family)),
+                                    offsetof(struct sk_msg_md, size)),
                         BPF_EXIT_INSN(),
                 },
                 .errstr = "invalid bpf_context access",
@@ -1857,7 +1867,7 @@ static struct bpf_test tests[] = {
                 "invalid read past end of SK_MSG",
                 .insns = {
                         BPF_LDX_MEM(BPF_W, BPF_REG_2, BPF_REG_1,
-                                    offsetof(struct sk_msg_md, local_port) + 4),
+                                    offsetof(struct sk_msg_md, size) + 4),
                         BPF_EXIT_INSN(),
                 },
                 .errstr = "R0 !read_ok",