linux-kernel - [PATCH bpf-next v7 10/11] selftests/bpf: add testcases for fsession cookie

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20260107064352.291069-11-dongml2@chinatelecom.cn>
Date: Wed,  7 Jan 2026 14:43:51 +0800
From: Menglong Dong <menglong8.dong@...il.com>
To: ast@...nel.org,
	andrii@...nel.org
Cc: daniel@...earbox.net,
	martin.lau@...ux.dev,
	eddyz87@...il.com,
	song@...nel.org,
	yonghong.song@...ux.dev,
	john.fastabend@...il.com,
	kpsingh@...nel.org,
	sdf@...ichev.me,
	haoluo@...gle.com,
	jolsa@...nel.org,
	davem@...emloft.net,
	dsahern@...nel.org,
	tglx@...utronix.de,
	mingo@...hat.com,
	jiang.biao@...ux.dev,
	bp@...en8.de,
	dave.hansen@...ux.intel.com,
	x86@...nel.org,
	hpa@...or.com,
	bpf@...r.kernel.org,
	netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH bpf-next v7 10/11] selftests/bpf: add testcases for fsession cookie

Test session cookie for fsession. Multiple fsession BPF progs is attached
to bpf_fentry_test1() and session cookie is read and write in the
testcase.

Signed-off-by: Menglong Dong <dongml2@...natelecom.cn>
---
v3:
- restructure the testcase by combine the testcases for session cookie and
  get_func_ip into one patch
---
 .../selftests/bpf/prog_tests/fsession_test.c  | 25 +++++++
 .../selftests/bpf/progs/fsession_test.c       | 72 +++++++++++++++++++
 2 files changed, 97 insertions(+)

diff --git a/tools/testing/selftests/bpf/prog_tests/fsession_test.c b/tools/testing/selftests/bpf/prog_tests/fsession_test.c
index 83f3953a1ff6..2459f9db1c92 100644
--- a/tools/testing/selftests/bpf/prog_tests/fsession_test.c
+++ b/tools/testing/selftests/bpf/prog_tests/fsession_test.c
@@ -77,6 +77,29 @@ static void test_fsession_reattach(void)
 	fsession_test__destroy(skel);
 }
 
+static void test_fsession_cookie(void)
+{
+	struct fsession_test *skel = NULL;
+	int err;
+
+	skel = fsession_test__open();
+	if (!ASSERT_OK_PTR(skel, "fsession_test__open"))
+		goto cleanup;
+
+	err = bpf_program__set_autoload(skel->progs.test11, true);
+	if (!ASSERT_OK(err, "bpf_program__set_autoload"))
+		goto cleanup;
+
+	err = fsession_test__load(skel);
+	if (!ASSERT_OK(err, "fsession_test__load"))
+		goto cleanup;
+
+	err = fsession_test__attach(skel);
+	ASSERT_EQ(err, -E2BIG, "fsession_cookie");
+cleanup:
+	fsession_test__destroy(skel);
+}
+
 void test_fsession_test(void)
 {
 #if !defined(__x86_64__)
@@ -87,4 +110,6 @@ void test_fsession_test(void)
 		test_fsession_basic();
 	if (test__start_subtest("fsession_reattach"))
 		test_fsession_reattach();
+	if (test__start_subtest("fsession_cookie"))
+		test_fsession_cookie();
 }
diff --git a/tools/testing/selftests/bpf/progs/fsession_test.c b/tools/testing/selftests/bpf/progs/fsession_test.c
index f504984d42f2..85e89f7219a7 100644
--- a/tools/testing/selftests/bpf/progs/fsession_test.c
+++ b/tools/testing/selftests/bpf/progs/fsession_test.c
@@ -108,3 +108,75 @@ int BPF_PROG(test6, int a)
 		test6_entry_result = (const void *) addr == &bpf_fentry_test1;
 	return 0;
 }
+
+__u64 test7_entry_ok = 0;
+__u64 test7_exit_ok = 0;
+SEC("fsession/bpf_fentry_test1")
+int BPF_PROG(test7, int a)
+{
+	__u64 *cookie = bpf_session_cookie(ctx);
+
+	if (!bpf_session_is_return(ctx)) {
+		*cookie = 0xAAAABBBBCCCCDDDDull;
+		test7_entry_ok = *cookie == 0xAAAABBBBCCCCDDDDull;
+		return 0;
+	}
+
+	test7_exit_ok = *cookie == 0xAAAABBBBCCCCDDDDull;
+	return 0;
+}
+
+__u64 test8_entry_ok = 0;
+__u64 test8_exit_ok = 0;
+
+SEC("fsession/bpf_fentry_test1")
+int BPF_PROG(test8, int a)
+{
+	__u64 *cookie = bpf_session_cookie(ctx);
+
+	if (!bpf_session_is_return(ctx)) {
+		*cookie = 0x1111222233334444ull;
+		test8_entry_ok = *cookie == 0x1111222233334444ull;
+		return 0;
+	}
+
+	test8_exit_ok = *cookie == 0x1111222233334444ull;
+	return 0;
+}
+
+__u64 test9_entry_result = 0;
+__u64 test9_exit_result = 0;
+
+SEC("fsession/bpf_fentry_test1")
+int BPF_PROG(test9, int a, int ret)
+{
+	__u64 *cookie = bpf_session_cookie(ctx);
+
+	if (!bpf_session_is_return(ctx)) {
+		test9_entry_result = a == 1 && ret == 0;
+		*cookie = 0x123456ULL;
+		return 0;
+	}
+
+	test9_exit_result = a == 1 && ret == 2 && *cookie == 0x123456ULL;
+	return 0;
+}
+
+SEC("fsession/bpf_fentry_test1")
+int BPF_PROG(test10, int a, int ret)
+{
+	__u64 *cookie = bpf_session_cookie(ctx);
+
+	*cookie = 0;
+	return 0;
+}
+
+/* This is the 5th cookie, so it should fail */
+SEC("?fsession/bpf_fentry_test1")
+int BPF_PROG(test11, int a, int ret)
+{
+	__u64 *cookie = bpf_session_cookie(ctx);
+
+	*cookie = 0;
+	return 0;
+}
-- 
2.52.0