tools/testing/selftests/bpf/prog_tests/task_under_cgroup.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /* Copyright (c) 2023 Bytedance */
   3
   4 #include <sys/syscall.h>
   5 #include <test_progs.h>
   6 #include <cgroup_helpers.h>
   7 #include "test_task_under_cgroup.skel.h"
   8
   9 #define FOO     "/foo"
  10
  11 void test_task_under_cgroup(void)
  12 {
  13         struct test_task_under_cgroup *skel;
  14         int ret, foo;
  15         pid_t pid;
  16
  17         foo = test__join_cgroup(FOO);
  18         if (!ASSERT_OK(foo < 0, "cgroup_join_foo"))
  19                 return;
  20
  21         skel = test_task_under_cgroup__open();
  22         if (!ASSERT_OK_PTR(skel, "test_task_under_cgroup__open"))
  23                 goto cleanup;
  24
  25         skel->rodata->local_pid = getpid();
  26         skel->bss->remote_pid = getpid();
  27         skel->rodata->cgid = get_cgroup_id(FOO);
  28
  29         ret = test_task_under_cgroup__load(skel);
  30         if (!ASSERT_OK(ret, "test_task_under_cgroup__load"))
  31                 goto cleanup;
  32
  33         /* First, attach the LSM program, and then it will be triggered when the
  34          * TP_BTF program is attached.
  35          */
  36         skel->links.lsm_run = bpf_program__attach_lsm(skel->progs.lsm_run);
  37         if (!ASSERT_OK_PTR(skel->links.lsm_run, "attach_lsm"))
  38                 goto cleanup;
  39
  40         skel->links.tp_btf_run = bpf_program__attach_trace(skel->progs.tp_btf_run);
  41         if (!ASSERT_OK_PTR(skel->links.tp_btf_run, "attach_tp_btf"))
  42                 goto cleanup;
  43
  44         pid = fork();
  45         if (pid == 0)
  46                 exit(0);
  47
  48         ret = (pid == -1);
  49         if (ASSERT_OK(ret, "fork process"))
  50                 wait(NULL);
  51
  52         test_task_under_cgroup__detach(skel);
  53
  54         ASSERT_NEQ(skel->bss->remote_pid, skel->rodata->local_pid,
  55                    "test task_under_cgroup");
  56
  57 cleanup:
  58         test_task_under_cgroup__destroy(skel);
  59         close(foo);
  60 }