netdev - [PATCH bpf-next 3/3] bpf: sk_msg, add tests for size field

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Message-Id: <1545004026-5127-4-git-send-email-john.fastabend@gmail.com>
Date:   Sun, 16 Dec 2018 15:47:06 -0800
From:   John Fastabend <john.fastabend@...il.com>
To:     daniel@...earbox.net, ast@...nel.org
Cc:     netdev@...r.kernel.org, john.fastabend@...il.com
Subject: [PATCH bpf-next 3/3] 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@...il.com>
---
 tools/testing/selftests/bpf/test_verifier.c | 16 +++++++++++++---
 1 file changed, 13 insertions(+), 3 deletions(-)

diff --git a/tools/testing/selftests/bpf/test_verifier.c b/tools/testing/selftests/bpf/test_verifier.c
index 537a8f9..65ea2fa 100644
--- a/tools/testing/selftests/bpf/test_verifier.c
+++ b/tools/testing/selftests/bpf/test_verifier.c
@@ -1792,10 +1792,20 @@ 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",
@@ -1806,7 +1816,7 @@ 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",
-- 
2.7.4