[RFC bpf-next 09/10] selftests/bpf: Add uprobe session cookie test

[Jiri Olsa]

Adding uprobe session test that verifies the cookie value
get properly propagated from entry to return program.

Signed-off-by: Jiri Olsa <jo...@kernel.org>
---
 .../bpf/prog_tests/uprobe_multi_test.c        | 31 ++++++++++++
 .../bpf/progs/uprobe_multi_session_cookie.c   | 50 +++++++++++++++++++
 2 files changed, 81 insertions(+)
 create mode 100644 
tools/testing/selftests/bpf/progs/uprobe_multi_session_cookie.c

diff --git a/tools/testing/selftests/bpf/prog_tests/uprobe_multi_test.c 
b/tools/testing/selftests/bpf/prog_tests/uprobe_multi_test.c
index 4bff681f0d7d..34671253e130 100644
--- a/tools/testing/selftests/bpf/prog_tests/uprobe_multi_test.c
+++ b/tools/testing/selftests/bpf/prog_tests/uprobe_multi_test.c
@@ -6,6 +6,7 @@
 #include "uprobe_multi_bench.skel.h"
 #include "uprobe_multi_usdt.skel.h"
 #include "uprobe_multi_session.skel.h"
+#include "uprobe_multi_session_cookie.skel.h"
 #include "bpf/libbpf_internal.h"
 #include "testing_helpers.h"
 
@@ -558,6 +559,34 @@ static void test_session_error_multiple_instances(void)
        uprobe_multi_session__destroy(skel_2);
 }
 
+static void test_session_cookie_skel_api(void)
+{
+       struct uprobe_multi_session_cookie *skel = NULL;
+       int err;
+
+       skel = uprobe_multi_session_cookie__open_and_load();
+       if (!ASSERT_OK_PTR(skel, "fentry_raw_skel_load"))
+               goto cleanup;
+
+       skel->bss->pid = getpid();
+
+       err = uprobe_multi_session_cookie__attach(skel);
+       if (!ASSERT_OK(err, " kprobe_multi_session__attach"))
+               goto cleanup;
+
+       /* trigger all probes */
+       uprobe_multi_func_1();
+       uprobe_multi_func_2();
+       uprobe_multi_func_3();
+
+       ASSERT_EQ(skel->bss->test_uprobe_1_result, 1, "test_uprobe_1_result");
+       ASSERT_EQ(skel->bss->test_uprobe_2_result, 2, "test_uprobe_2_result");
+       ASSERT_EQ(skel->bss->test_uprobe_3_result, 3, "test_uprobe_3_result");
+
+cleanup:
+       uprobe_multi_session_cookie__destroy(skel);
+}
+
 static void test_bench_attach_uprobe(void)
 {
        long attach_start_ns = 0, attach_end_ns = 0;
@@ -650,4 +679,6 @@ void test_uprobe_multi_test(void)
                test_session_skel_api();
        if (test__start_subtest("session_errors"))
                test_session_error_multiple_instances();
+       if (test__start_subtest("session_cookie"))
+               test_session_cookie_skel_api();
 }
diff --git a/tools/testing/selftests/bpf/progs/uprobe_multi_session_cookie.c 
b/tools/testing/selftests/bpf/progs/uprobe_multi_session_cookie.c
new file mode 100644
index 000000000000..ea41503fad18
--- /dev/null
+++ b/tools/testing/selftests/bpf/progs/uprobe_multi_session_cookie.c
@@ -0,0 +1,50 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/bpf.h>
+#include <bpf/bpf_helpers.h>
+#include <bpf/bpf_tracing.h>
+#include <stdbool.h>
+#include "bpf_kfuncs.h"
+
+char _license[] SEC("license") = "GPL";
+
+int pid = 0;
+
+__u64 test_uprobe_1_result = 0;
+__u64 test_uprobe_2_result = 0;
+__u64 test_uprobe_3_result = 0;
+
+static int check_cookie(__u64 val, __u64 *result)
+{
+       long *cookie;
+
+       if (bpf_get_current_pid_tgid() >> 32 != pid)
+               return 1;
+
+       cookie = bpf_session_cookie();
+
+       if (bpf_session_is_return()) {
+               *result = *cookie == val ? val : 0;
+       } else {
+               *cookie = val;
+       }
+
+       return 0;
+}
+
+SEC("uprobe.session//proc/self/exe:uprobe_multi_func_1")
+int uprobe_1(struct pt_regs *ctx)
+{
+       return check_cookie(1, &test_uprobe_1_result);
+}
+
+SEC("uprobe.session//proc/self/exe:uprobe_multi_func_2")
+int uprobe_2(struct pt_regs *ctx)
+{
+       return check_cookie(2, &test_uprobe_2_result);
+}
+
+SEC("uprobe.session//proc/self/exe:uprobe_multi_func_3")
+int uprobe_3(struct pt_regs *ctx)
+{
+       return check_cookie(3, &test_uprobe_3_result);
+}
-- 
2.45.1