selftests/bpf: Clean up user_ringbuf, cgrp_kfunc, kfunc_dynptr_param tests

Clean up user_ringbuf, cgrp_kfunc, and kfunc_dynptr_param tests to use
the generic verification tester for checking verifier rejections.
The generic verification tester uses btf_decl_tag-based annotations
for verifying that the tests fail with the expected log messages.

Signed-off-by: Joanne Koong <joannelkoong@gmail.com>
Acked-by: David Vernet <void@manifault.com>
Reviewed-by: Roberto Sassu <roberto.sassu@huawei.com>
Link: https://lore.kernel.org/r/20230214051332.4007131-1-joannelkoong@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

1 files changed, 15 insertions, 57 deletions

diff --git a/tools/testing/selftests/bpf/prog_tests/kfunc_dynptr_param.c b/tools/testing/selftests/bpf/prog_tests/kfunc_dynptr_param.c
index 72800b1e8395..8cd298b78e44 100644
--- a/tools/testing/selftests/bpf/prog_tests/kfunc_dynptr_param.c
+++ b/tools/testing/selftests/bpf/prog_tests/kfunc_dynptr_param.c
@@ -10,17 +10,11 @@
 #include <test_progs.h>
 #include "test_kfunc_dynptr_param.skel.h"
 
-static size_t log_buf_sz = 1048576; /* 1 MB */
-static char obj_log_buf[1048576];
-
 static struct {
 	const char *prog_name;
-	const char *expected_verifier_err_msg;
 	int expected_runtime_err;
 } kfunc_dynptr_tests[] = {
-	{"not_valid_dynptr", "cannot pass in dynptr at an offset=-8", 0},
-	{"not_ptr_to_stack", "arg#0 expected pointer to stack or dynptr_ptr", 0},
-	{"dynptr_data_null", NULL, -EBADMSG},
+	{"dynptr_data_null", -EBADMSG},
 };
 
 static bool kfunc_not_supported;
@@ -38,29 +32,15 @@ static int libbpf_print_cb(enum libbpf_print_level level, const char *fmt,
 	return 0;
 }
 
-static void verify_fail(const char *prog_name, const char *expected_err_msg)
+static bool has_pkcs7_kfunc_support(void)
 {
 	struct test_kfunc_dynptr_param *skel;
-	LIBBPF_OPTS(bpf_object_open_opts, opts);
 	libbpf_print_fn_t old_print_cb;
-	struct bpf_program *prog;
 	int err;
 
-	opts.kernel_log_buf = obj_log_buf;
-	opts.kernel_log_size = log_buf_sz;
-	opts.kernel_log_level = 1;
-
-	skel = test_kfunc_dynptr_param__open_opts(&opts);
-	if (!ASSERT_OK_PTR(skel, "test_kfunc_dynptr_param__open_opts"))
-		goto cleanup;
-
-	prog = bpf_object__find_program_by_name(skel->obj, prog_name);
-	if (!ASSERT_OK_PTR(prog, "bpf_object__find_program_by_name"))
-		goto cleanup;
-
-	bpf_program__set_autoload(prog, true);
-
-	bpf_map__set_max_entries(skel->maps.ringbuf, getpagesize());
+	skel = test_kfunc_dynptr_param__open();
+	if (!ASSERT_OK_PTR(skel, "test_kfunc_dynptr_param__open"))
+		return false;
 
 	kfunc_not_supported = false;
 
@@ -72,26 +52,18 @@ static void verify_fail(const char *prog_name, const char *expected_err_msg)
 		fprintf(stderr,
 		  "%s:SKIP:bpf_verify_pkcs7_signature() kfunc not supported\n",
 		  __func__);
-		test__skip();
-		goto cleanup;
-	}
-
-	if (!ASSERT_ERR(err, "unexpected load success"))
-		goto cleanup;
-
-	if (!ASSERT_OK_PTR(strstr(obj_log_buf, expected_err_msg), "expected_err_msg")) {
-		fprintf(stderr, "Expected err_msg: %s\n", expected_err_msg);
-		fprintf(stderr, "Verifier output: %s\n", obj_log_buf);
+		test_kfunc_dynptr_param__destroy(skel);
+		return false;
 	}
 
-cleanup:
 	test_kfunc_dynptr_param__destroy(skel);
+
+	return true;
 }
 
 static void verify_success(const char *prog_name, int expected_runtime_err)
 {
 	struct test_kfunc_dynptr_param *skel;
-	libbpf_print_fn_t old_print_cb;
 	struct bpf_program *prog;
 	struct bpf_link *link;
 	__u32 next_id;
@@ -103,21 +75,7 @@ static void verify_success(const char *prog_name, int expected_runtime_err)
 
 	skel->bss->pid = getpid();
 
-	bpf_map__set_max_entries(skel->maps.ringbuf, getpagesize());
-
-	kfunc_not_supported = false;
-
-	old_print_cb = libbpf_set_print(libbpf_print_cb);
 	err = test_kfunc_dynptr_param__load(skel);
-	libbpf_set_print(old_print_cb);
-
-	if (err < 0 && kfunc_not_supported) {
-		fprintf(stderr,
-		  "%s:SKIP:bpf_verify_pkcs7_signature() kfunc not supported\n",
-		  __func__);
-		test__skip();
-		goto cleanup;
-	}
 
 	if (!ASSERT_OK(err, "test_kfunc_dynptr_param__load"))
 		goto cleanup;
@@ -147,15 +105,15 @@ void test_kfunc_dynptr_param(void)
 {
 	int i;
 
+	if (!has_pkcs7_kfunc_support())
+		return;
+
 	for (i = 0; i < ARRAY_SIZE(kfunc_dynptr_tests); i++) {
 		if (!test__start_subtest(kfunc_dynptr_tests[i].prog_name))
 			continue;
 
-		if (kfunc_dynptr_tests[i].expected_verifier_err_msg)
-			verify_fail(kfunc_dynptr_tests[i].prog_name,
-			  kfunc_dynptr_tests[i].expected_verifier_err_msg);
-		else
-			verify_success(kfunc_dynptr_tests[i].prog_name,
-				kfunc_dynptr_tests[i].expected_runtime_err);
+		verify_success(kfunc_dynptr_tests[i].prog_name,
+			kfunc_dynptr_tests[i].expected_runtime_err);
 	}
+	RUN_TESTS(test_kfunc_dynptr_param);
 }