[PATCH bpf-next v5 7/9] selftests/bpf: Add tests to verify verifier log for global percpu data

[Leon Hwang <leon.hwang@linux.dev>]

Add two tests to verify the verifier log
"R%d points to percpu_array map which cannot be used as const string\n".

Signed-off-by: Leon Hwang <leon.hwang@linux.dev>
---
 .../bpf/prog_tests/global_data_init.c         |  7 ++++++
 .../bpf/progs/test_global_percpu_data.c       | 23 +++++++++++++++++++
 2 files changed, 30 insertions(+)

diff --git a/tools/testing/selftests/bpf/prog_tests/global_data_init.c b/tools/testing/selftests/bpf/prog_tests/global_data_init.c
index 5abdb0b8b8b3..729878d5d3b3 100644
--- a/tools/testing/selftests/bpf/prog_tests/global_data_init.c
+++ b/tools/testing/selftests/bpf/prog_tests/global_data_init.c
@@ -244,6 +244,11 @@ static void test_global_percpu_data_lskel(void)
 	free(online);
 }
 
+static void test_global_percpu_data_verifier_log(void)
+{
+	RUN_TESTS(test_global_percpu_data);
+}
+
 void test_global_percpu_data(void)
 {
 	if (!feat_supported(NULL, FEAT_PERCPU_DATA)) {
@@ -255,4 +260,6 @@ void test_global_percpu_data(void)
 		test_global_percpu_data_init();
 	if (test__start_subtest("lskel"))
 		test_global_percpu_data_lskel();
+	if (test__start_subtest("verifier_log"))
+		test_global_percpu_data_verifier_log();
 }
diff --git a/tools/testing/selftests/bpf/progs/test_global_percpu_data.c b/tools/testing/selftests/bpf/progs/test_global_percpu_data.c
index ba92ffb0ca49..2222ad3a49bd 100644
--- a/tools/testing/selftests/bpf/progs/test_global_percpu_data.c
+++ b/tools/testing/selftests/bpf/progs/test_global_percpu_data.c
@@ -28,4 +28,27 @@ int update_percpu_data(void *ctx)
 	return 0;
 }
 
+static const char fmt[] SEC(".percpu.fmt") = "data %d\n";
+
+SEC("?kprobe")
+__failure __msg("R{{[0-9]+}} points to percpu_array map which cannot be used as const string")
+int verifier_strncmp(void *ctx)
+{
+	return bpf_strncmp("test", 5, fmt);
+}
+
+SEC("?kprobe")
+__failure __msg("R{{[0-9]+}} points to percpu_array map which cannot be used as const string")
+int verifier_snprintf(void *ctx)
+{
+	u64 args[] = { data };
+	char buf[128];
+	int len;
+
+	len = bpf_snprintf(buf, sizeof(buf), fmt, args, 1);
+	if (len > 0)
+		bpf_printk("snprintf: %s\n", buf);
+	return 0;
+}
+
 char _license[] SEC("license") = "GPL";
-- 
2.54.0