selftests/bpf: Enable signature verification for some lskel tests

The test harness uses the verify_sig_setup.sh to generate the required
key material for program signing.

Generate key material for signing LSKEL some lskel programs and use
xxd to convert the verification certificate into a C header file.

Finally, update the main test runner to load this
certificate into the session keyring via the add_key() syscall before
executing any tests. Use the session keyring in the tests with signed
programs.

Signed-off-by: KP Singh <kpsingh@kernel.org>
Link: https://lore.kernel.org/r/20250921160120.9711-6-kpsingh@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

4 files changed, 35 insertions, 8 deletions

diff --git a/tools/testing/selftests/bpf/prog_tests/atomics.c b/tools/testing/selftests/bpf/prog_tests/atomics.c
index 13e101f370a1..92b5f378bfb8 100644
--- a/tools/testing/selftests/bpf/prog_tests/atomics.c
+++ b/tools/testing/selftests/bpf/prog_tests/atomics.c
@@ -165,11 +165,17 @@ static void test_xchg(struct atomics_lskel *skel)
 void test_atomics(void)
 {
 	struct atomics_lskel *skel;
+	int err;
 
-	skel = atomics_lskel__open_and_load();
-	if (!ASSERT_OK_PTR(skel, "atomics skeleton load"))
+	skel = atomics_lskel__open();
+	if (!ASSERT_OK_PTR(skel, "atomics skeleton open"))
 		return;
 
+	skel->keyring_id = KEY_SPEC_SESSION_KEYRING;
+	err = atomics_lskel__load(skel);
+	if (!ASSERT_OK(err, "atomics skeleton load"))
+		goto cleanup;
+
 	if (skel->data->skip_tests) {
 		printf("%s:SKIP:no ENABLE_ATOMICS_TESTS (missing Clang BPF atomics support)",
 		       __func__);
diff --git a/tools/testing/selftests/bpf/prog_tests/fentry_fexit.c b/tools/testing/selftests/bpf/prog_tests/fentry_fexit.c
index 130f5b82d2e6..5ef1804e44df 100644
--- a/tools/testing/selftests/bpf/prog_tests/fentry_fexit.c
+++ b/tools/testing/selftests/bpf/prog_tests/fentry_fexit.c
@@ -12,13 +12,24 @@ void test_fentry_fexit(void)
 	int err, prog_fd, i;
 	LIBBPF_OPTS(bpf_test_run_opts, topts);
 
-	fentry_skel = fentry_test_lskel__open_and_load();
+	fentry_skel = fentry_test_lskel__open();
 	if (!ASSERT_OK_PTR(fentry_skel, "fentry_skel_load"))
 		goto close_prog;
-	fexit_skel = fexit_test_lskel__open_and_load();
+
+	fentry_skel->keyring_id	= KEY_SPEC_SESSION_KEYRING;
+	err = fentry_test_lskel__load(fentry_skel);
+	if (!ASSERT_OK(err, "fentry_skel_load"))
+		goto close_prog;
+
+	fexit_skel = fexit_test_lskel__open();
 	if (!ASSERT_OK_PTR(fexit_skel, "fexit_skel_load"))
 		goto close_prog;
 
+	fexit_skel->keyring_id	= KEY_SPEC_SESSION_KEYRING;
+	err = fexit_test_lskel__load(fexit_skel);
+	if (!ASSERT_OK(err, "fexit_skel_load"))
+		goto close_prog;
+
 	err = fentry_test_lskel__attach(fentry_skel);
 	if (!ASSERT_OK(err, "fentry_attach"))
 		goto close_prog;
diff --git a/tools/testing/selftests/bpf/prog_tests/fentry_test.c b/tools/testing/selftests/bpf/prog_tests/fentry_test.c
index aee1bc77a17f..ec882328eb59 100644
--- a/tools/testing/selftests/bpf/prog_tests/fentry_test.c
+++ b/tools/testing/selftests/bpf/prog_tests/fentry_test.c
@@ -43,8 +43,13 @@ static void fentry_test(void)
 	struct fentry_test_lskel *fentry_skel = NULL;
 	int err;
 
-	fentry_skel = fentry_test_lskel__open_and_load();
-	if (!ASSERT_OK_PTR(fentry_skel, "fentry_skel_load"))
+	fentry_skel = fentry_test_lskel__open();
+	if (!ASSERT_OK_PTR(fentry_skel, "fentry_skel_open"))
+		goto cleanup;
+
+	fentry_skel->keyring_id	= KEY_SPEC_SESSION_KEYRING;
+	err = fentry_test_lskel__load(fentry_skel);
+	if (!ASSERT_OK(err, "fentry_skel_load"))
 		goto cleanup;
 
 	err = fentry_test_common(fentry_skel);
diff --git a/tools/testing/selftests/bpf/prog_tests/fexit_test.c b/tools/testing/selftests/bpf/prog_tests/fexit_test.c
index 1c13007e37dd..94eed753560c 100644
--- a/tools/testing/selftests/bpf/prog_tests/fexit_test.c
+++ b/tools/testing/selftests/bpf/prog_tests/fexit_test.c
@@ -43,8 +43,13 @@ static void fexit_test(void)
 	struct fexit_test_lskel *fexit_skel = NULL;
 	int err;
 
-	fexit_skel = fexit_test_lskel__open_and_load();
-	if (!ASSERT_OK_PTR(fexit_skel, "fexit_skel_load"))
+	fexit_skel = fexit_test_lskel__open();
+	if (!ASSERT_OK_PTR(fexit_skel, "fexit_skel_open"))
+		goto cleanup;
+
+	fexit_skel->keyring_id	= KEY_SPEC_SESSION_KEYRING;
+	err = fexit_test_lskel__load(fexit_skel);
+	if (!ASSERT_OK(err, "fexit_skel_load"))
 		goto cleanup;
 
 	err = fexit_test_common(fexit_skel);