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From: Jiri Olsa <jolsa@kernel.org>
To: Alexei Starovoitov <ast@kernel.org>,
	Daniel Borkmann <daniel@iogearbox.net>,
	Andrii Nakryiko <andriin@fb.com>
Cc: "Andrii Nakryiko" <andrii@kernel.org>,
	netdev@vger.kernel.org, bpf@vger.kernel.org,
	"Martin KaFai Lau" <kafai@fb.com>,
	"Song Liu" <songliubraving@fb.com>, "Yonghong Song" <yhs@fb.com>,
	"John Fastabend" <john.fastabend@gmail.com>,
	"KP Singh" <kpsingh@chromium.org>,
	"Toke Høiland-Jørgensen" <toke@redhat.com>
Subject: [PATCHv3 bpf-next 5/5] selftests/bpf: Test that module can't be unloaded with attached trampoline
Date: Sun, 11 Apr 2021 15:00:10 +0200
Message-ID: <20210411130010.1337650-6-jolsa@kernel.org> (raw)
In-Reply-To: <20210411130010.1337650-1-jolsa@kernel.org>

Adding test to verify that once we attach module's trampoline,
the module can't be unloaded.

Acked-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
---
 .../selftests/bpf/prog_tests/module_attach.c  | 23 +++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/tools/testing/selftests/bpf/prog_tests/module_attach.c b/tools/testing/selftests/bpf/prog_tests/module_attach.c
index 5bc53d53d86e..d85a69b7ce44 100644
--- a/tools/testing/selftests/bpf/prog_tests/module_attach.c
+++ b/tools/testing/selftests/bpf/prog_tests/module_attach.c
@@ -45,12 +45,18 @@ static int trigger_module_test_write(int write_sz)
 	return 0;
 }
 
+static int delete_module(const char *name, int flags)
+{
+	return syscall(__NR_delete_module, name, flags);
+}
+
 void test_module_attach(void)
 {
 	const int READ_SZ = 456;
 	const int WRITE_SZ = 457;
 	struct test_module_attach* skel;
 	struct test_module_attach__bss *bss;
+	struct bpf_link *link;
 	int err;
 
 	skel = test_module_attach__open();
@@ -84,6 +90,23 @@ void test_module_attach(void)
 	ASSERT_EQ(bss->fexit_ret, -EIO, "fexit_tet");
 	ASSERT_EQ(bss->fmod_ret_read_sz, READ_SZ, "fmod_ret");
 
+	test_module_attach__detach(skel);
+
+	/* attach fentry/fexit and make sure it get's module reference */
+	link = bpf_program__attach(skel->progs.handle_fentry);
+	if (!ASSERT_OK_PTR(link, "attach_fentry"))
+		goto cleanup;
+
+	ASSERT_ERR(delete_module("bpf_testmod", 0), "delete_module");
+	bpf_link__destroy(link);
+
+	link = bpf_program__attach(skel->progs.handle_fexit);
+	if (!ASSERT_OK_PTR(link, "attach_fexit"))
+		goto cleanup;
+
+	ASSERT_ERR(delete_module("bpf_testmod", 0), "delete_module");
+	bpf_link__destroy(link);
+
 cleanup:
 	test_module_attach__destroy(skel);
 }
-- 
2.30.2


      parent reply index

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-11 13:00 [PATCHv3 bpf-next 0/5] bpf: Tracing and lsm programs re-attach Jiri Olsa
2021-04-11 13:00 ` [PATCHv3 bpf-next 1/5] bpf: Allow trampoline re-attach for tracing and lsm programs Jiri Olsa
2021-04-11 13:00 ` [PATCHv3 bpf-next 2/5] selftests/bpf: Add re-attach test to fentry_test Jiri Olsa
2021-04-11 13:00 ` [PATCHv3 bpf-next 3/5] selftests/bpf: Add re-attach test to fexit_test Jiri Olsa
2021-04-11 13:00 ` [PATCHv3 bpf-next 4/5] selftests/bpf: Add re-attach test to lsm test Jiri Olsa
2021-04-11 13:00 ` Jiri Olsa [this message]

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