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From: John Fastabend <john.fastabend@gmail.com>
To: yhs@fb.com, andrii.nakryiko@gmail.com, ast@kernel.org,
Cc: netdev@vger.kernel.org, bpf@vger.kernel.org, john.fastabend@gmail.com
Subject: [bpf-next PATCH v2 4/4] bpf: selftests, add printk to test_sk_lookup_kern to encode null ptr check
Date: Thu, 21 May 2020 13:08:26 -0700
Message-ID: <159009170603.6313.1715279795045285176.stgit@john-Precision-5820-Tower> (raw)
In-Reply-To: <159009128301.6313.11384218513010252427.stgit@john-Precision-5820-Tower>

Adding a printk to test_sk_lookup_kern created the reported failure
where a pointer type is checked twice for NULL. Lets add it to the
progs test test_sk_lookup_kern.c so we test the case from C all the
way into the verifier.

We already have printk's in selftests so seems OK to add another one.

Acked-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: John Fastabend <john.fastabend@gmail.com>
 .../selftests/bpf/progs/test_sk_lookup_kern.c      |    1 +
 1 file changed, 1 insertion(+)

diff --git a/tools/testing/selftests/bpf/progs/test_sk_lookup_kern.c b/tools/testing/selftests/bpf/progs/test_sk_lookup_kern.c
index d2b38fa..e83d0b4 100644
--- a/tools/testing/selftests/bpf/progs/test_sk_lookup_kern.c
+++ b/tools/testing/selftests/bpf/progs/test_sk_lookup_kern.c
@@ -73,6 +73,7 @@ int bpf_sk_lookup_test0(struct __sk_buff *skb)
 	tuple_len = ipv4 ? sizeof(tuple->ipv4) : sizeof(tuple->ipv6);
 	sk = bpf_sk_lookup_tcp(skb, tuple, tuple_len, BPF_F_CURRENT_NETNS, 0);
+	bpf_printk("sk=%d\n", sk ? 1 : 0);
 	if (sk)
 	return sk ? TC_ACT_OK : TC_ACT_UNSPEC;

  parent reply index

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-21 20:07 [bpf-next PATCH v2 0/4] ] verifier, improve ptr is_branch_taken logic John Fastabend
2020-05-21 20:07 ` [bpf-next PATCH v2 1/4] bpf: verifier track null pointer branch_taken with JNE and JEQ John Fastabend
2020-05-21 20:07 ` [bpf-next PATCH v2 2/4] bpf: selftests, verifier case for non null pointer check branch taken John Fastabend
2020-05-21 20:08 ` [bpf-next PATCH v2 3/4] bpf: selftests, verifier case for non null pointer map value branch John Fastabend
2020-05-21 20:08 ` John Fastabend [this message]
2020-05-21 22:21 ` [bpf-next PATCH v2 0/4] ] verifier, improve ptr is_branch_taken logic Andrii Nakryiko
2020-05-22  0:49   ` Alexei Starovoitov

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