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Sun, 29 Mar 2026 05:44:43 -0700 (PDT) From: Hoyeon Lee To: bpf@vger.kernel.org, Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Martin KaFai Lau Cc: Eduard Zingerman , Kumar Kartikeya Dwivedi , Song Liu , Yonghong Song , Jiri Olsa , Shuah Khan , Feng Yang , linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH bpf-next v2 2/2] selftests/bpf: add test for address-based single kprobe attach Date: Sun, 29 Mar 2026 21:43:39 +0900 Message-ID: <20260329124429.689912-3-hoyeon.lee@suse.com> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20260329124429.689912-1-hoyeon.lee@suse.com> References: <20260329124429.689912-1-hoyeon.lee@suse.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Currently, attach_probe covers manual single-kprobe attaches by func_name, but not by raw address. This commit adds address-based single-kprobe attach subtests for the two underlying attach paths, legacy tracefs/debugfs and PMU-based non-legacy. The new subtests resolve SYS_NANOSLEEP_KPROBE_NAME through kallsyms, pass the result through bpf_kprobe_opts.addr, and verify that kprobe and kretprobe are still triggered. Signed-off-by: Hoyeon Lee --- .../selftests/bpf/prog_tests/attach_probe.c | 49 +++++++++++++++++++ 1 file changed, 49 insertions(+) diff --git a/tools/testing/selftests/bpf/prog_tests/attach_probe.c b/tools/= testing/selftests/bpf/prog_tests/attach_probe.c index 9e77e5da7097..64f2ed75779d 100644 --- a/tools/testing/selftests/bpf/prog_tests/attach_probe.c +++ b/tools/testing/selftests/bpf/prog_tests/attach_probe.c @@ -123,6 +123,51 @@ static void test_attach_probe_manual(enum probe_attach= _mode attach_mode) test_attach_probe_manual__destroy(skel); } =20 +/* manual attach address-based kprobe/kretprobe testings */ +static void test_attach_kprobe_by_addr(enum probe_attach_mode attach_mode) +{ + DECLARE_LIBBPF_OPTS(bpf_kprobe_opts, kprobe_opts); + struct bpf_link *kprobe_link, *kretprobe_link; + struct test_attach_probe_manual *skel; + unsigned long func_addr; + + if (!ASSERT_OK(load_kallsyms(), "load_kallsyms")) + return; + + func_addr =3D ksym_get_addr(SYS_NANOSLEEP_KPROBE_NAME); + if (!ASSERT_NEQ(func_addr, 0UL, "func_addr")) + return; + + skel =3D test_attach_probe_manual__open_and_load(); + if (!ASSERT_OK_PTR(skel, "skel_kprobe_manual_open_and_load")) + return; + + kprobe_opts.attach_mode =3D attach_mode; + kprobe_opts.retprobe =3D false; + kprobe_opts.addr =3D func_addr; + kprobe_link =3D bpf_program__attach_kprobe_opts(skel->progs.handle_kprobe, + NULL, &kprobe_opts); + if (!ASSERT_OK_PTR(kprobe_link, "attach_kprobe_by_addr")) + goto cleanup; + skel->links.handle_kprobe =3D kprobe_link; + + kprobe_opts.retprobe =3D true; + kretprobe_link =3D bpf_program__attach_kprobe_opts(skel->progs.handle_kre= tprobe, + NULL, &kprobe_opts); + if (!ASSERT_OK_PTR(kretprobe_link, "attach_kretprobe_by_addr")) + goto cleanup; + skel->links.handle_kretprobe =3D kretprobe_link; + + /* trigger & validate kprobe && kretprobe */ + usleep(1); + + ASSERT_EQ(skel->bss->kprobe_res, 1, "check_kprobe_res"); + ASSERT_EQ(skel->bss->kretprobe_res, 2, "check_kretprobe_res"); + +cleanup: + test_attach_probe_manual__destroy(skel); +} + /* attach uprobe/uretprobe long event name testings */ static void test_attach_uprobe_long_event_name(void) { @@ -416,6 +461,10 @@ void test_attach_probe(void) test_attach_probe_manual(PROBE_ATTACH_MODE_PERF); if (test__start_subtest("manual-link")) test_attach_probe_manual(PROBE_ATTACH_MODE_LINK); + if (test__start_subtest("kprobe-legacy-by-addr")) + test_attach_kprobe_by_addr(PROBE_ATTACH_MODE_LEGACY); + if (test__start_subtest("kprobe-perf-by-addr")) + test_attach_kprobe_by_addr(PROBE_ATTACH_MODE_PERF); =20 if (test__start_subtest("auto")) test_attach_probe_auto(skel); --=20 2.52.0