diff options
| -rw-r--r-- | tools/testing/selftests/bpf/prog_tests/bpf_iter.c | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/prog_tests/bpf_iter.c b/tools/testing/selftests/bpf/prog_tests/bpf_iter.c index 6f8ed61fc4b4..3af6450763e9 100644 --- a/tools/testing/selftests/bpf/prog_tests/bpf_iter.c +++ b/tools/testing/selftests/bpf/prog_tests/bpf_iter.c @@ -1465,6 +1465,77 @@ out: bpf_iter_task_vma__destroy(skel); } +static void test_task_vma_dead_task(void) +{ + struct bpf_iter_task_vma *skel; + int wstatus, child_pid = -1; + time_t start_tm, cur_tm; + int err, iter_fd = -1; + int wait_sec = 3; + + skel = bpf_iter_task_vma__open(); + if (!ASSERT_OK_PTR(skel, "bpf_iter_task_vma__open")) + return; + + skel->bss->pid = getpid(); + + err = bpf_iter_task_vma__load(skel); + if (!ASSERT_OK(err, "bpf_iter_task_vma__load")) + goto out; + + skel->links.proc_maps = bpf_program__attach_iter( + skel->progs.proc_maps, NULL); + + if (!ASSERT_OK_PTR(skel->links.proc_maps, "bpf_program__attach_iter")) { + skel->links.proc_maps = NULL; + goto out; + } + + start_tm = time(NULL); + cur_tm = start_tm; + + child_pid = fork(); + if (child_pid == 0) { + /* Fork short-lived processes in the background. */ + while (cur_tm < start_tm + wait_sec) { + system("echo > /dev/null"); + cur_tm = time(NULL); + } + exit(0); + } + + if (!ASSERT_GE(child_pid, 0, "fork_child")) + goto out; + + while (cur_tm < start_tm + wait_sec) { + iter_fd = bpf_iter_create(bpf_link__fd(skel->links.proc_maps)); + if (!ASSERT_GE(iter_fd, 0, "create_iter")) + goto out; + + /* Drain all data from iter_fd. */ + while (cur_tm < start_tm + wait_sec) { + err = read_fd_into_buffer(iter_fd, task_vma_output, CMP_BUFFER_SIZE); + if (!ASSERT_GE(err, 0, "read_iter_fd")) + goto out; + + cur_tm = time(NULL); + + if (err == 0) + break; + } + + close(iter_fd); + iter_fd = -1; + } + + check_bpf_link_info(skel->progs.proc_maps); + +out: + waitpid(child_pid, &wstatus, 0); + close(iter_fd); + bpf_iter_task_vma__destroy(skel); +} + void test_bpf_sockmap_map_iter_fd(void) { struct bpf_iter_sockmap *skel; @@ -1586,6 +1657,8 @@ void test_bpf_iter(void) test_task_file(); if (test__start_subtest("task_vma")) test_task_vma(); + if (test__start_subtest("task_vma_dead_task")) + test_task_vma_dead_task(); if (test__start_subtest("task_btf")) test_task_btf(); if (test__start_subtest("tcp4")) |