From: Jiri Olsa <jolsa@xxxxxxxxxx> commit e697d8dcebd2f557fa5e5ed57aaf0a9992ce9df8 upstream. Adding test that makes sure the kernel module won't be removed if there's kprobe multi link defined on top of it. Acked-by: Song Liu <song@xxxxxxxxxx> Signed-off-by: Jiri Olsa <jolsa@xxxxxxxxxx> Link: https://lore.kernel.org/r/20221025134148.3300700-8-jolsa@xxxxxxxxxx Signed-off-by: Alexei Starovoitov <ast@xxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- tools/testing/selftests/bpf/prog_tests/module_attach.c | 7 +++++++ tools/testing/selftests/bpf/progs/test_module_attach.c | 6 ++++++ 2 files changed, 13 insertions(+) --- a/tools/testing/selftests/bpf/prog_tests/module_attach.c +++ b/tools/testing/selftests/bpf/prog_tests/module_attach.c @@ -103,6 +103,13 @@ void test_module_attach(void) ASSERT_ERR(delete_module("bpf_testmod", 0), "delete_module"); bpf_link__destroy(link); + link = bpf_program__attach(skel->progs.kprobe_multi); + if (!ASSERT_OK_PTR(link, "attach_kprobe_multi")) + goto cleanup; + + ASSERT_ERR(delete_module("bpf_testmod", 0), "delete_module"); + bpf_link__destroy(link); + cleanup: test_module_attach__destroy(skel); } --- a/tools/testing/selftests/bpf/progs/test_module_attach.c +++ b/tools/testing/selftests/bpf/progs/test_module_attach.c @@ -110,4 +110,10 @@ int BPF_PROG(handle_fmod_ret, return 0; /* don't override the exit code */ } +SEC("kprobe.multi/bpf_testmod_test_read") +int BPF_PROG(kprobe_multi) +{ + return 0; +} + char _license[] SEC("license") = "GPL";
