kernel/tools/testing/selftests/bpf/progs/uprobe_multi.c, branch linux-rolling-stable

selftests/bpf: extend multi-uprobe tests with USDTs

2024-05-25T17:46:02Z

Validate libbpf's USDT-over-multi-uprobe logic by adding USDTs to existing multi-uprobe tests. This checks correct libbpf fallback to singular uprobes (when run on older kernels with buggy PID filtering). We reuse already established child process and child thread testing infrastructure, so additions are minimal. These test fail on either older kernels or older version of libbpf that doesn't detect PID filtering problems. Acked-by: Jiri Olsa Signed-off-by: Andrii Nakryiko Link: https://lore.kernel.org/r/20240521163401.3005045-6-andrii@kernel.org Signed-off-by: Alexei Starovoitov

selftests/bpf: extend multi-uprobe tests with child thread case

2024-05-25T17:46:02Z

Extend existing multi-uprobe tests to test that PID filtering works correctly. We already have child *process* tests, but we need also child *thread* tests. This patch adds spawn_thread() helper to start child thread, wait for it to be ready, and then instruct it to trigger desired uprobes. Additionally, we extend BPF-side code to track thread ID, not just process ID. Also we detect whether extraneous triggerings with unexpected process IDs happened, and validate that none of that happened in practice. These changes prove that fixed PID filtering logic for multi-uprobe works as expected. These tests fail on old kernels. Signed-off-by: Andrii Nakryiko Acked-by: Jiri Olsa Link: https://lore.kernel.org/r/20240521163401.3005045-5-andrii@kernel.org Signed-off-by: Alexei Starovoitov

selftests/bpf: Add extra link to uprobe_multi tests

2023-08-21T22:51:27Z

Attaching extra program to same functions system wide for api and link tests. This way we can test the pid filter works properly when there's extra system wide consumer on the same uprobe that will trigger the original uprobe handler. We expect to have the same counts as before. Signed-off-by: Jiri Olsa Link: https://lore.kernel.org/r/20230809083440.3209381-29-jolsa@kernel.org Signed-off-by: Alexei Starovoitov

selftests/bpf: Add uprobe_multi pid filter tests

2023-08-21T22:51:27Z

Running api and link tests also with pid filter and checking the probe gets executed only for specific pid. Spawning extra process to trigger attached uprobes and checking we get correct counts from executed programs. Signed-off-by: Jiri Olsa Link: https://lore.kernel.org/r/20230809083440.3209381-28-jolsa@kernel.org Signed-off-by: Alexei Starovoitov

selftests/bpf: Add uprobe_multi skel test

2023-08-21T22:51:27Z

Adding uprobe_multi test for skeleton load/attach functions, to test skeleton auto attach for uprobe_multi link. Test that bpf_get_func_ip works properly for uprobe_multi attachment. Signed-off-by: Jiri Olsa Link: https://lore.kernel.org/r/20230809083440.3209381-20-jolsa@kernel.org Signed-off-by: Alexei Starovoitov