LXR linux/tools/testing/selftests/bpf/prog_tests/ns_current_pid

   1// SPDX-License-Identifier: GPL-2.0
   2/* Copyright (c) 2020 Carlos Neira cneirabustos@gmail.com */
   3
   4#define _GNU_SOURCE
   5#include <test_progs.h>
   6#include "test_ns_current_pid_tgid.skel.h"
   7#include <sys/stat.h>
   8#include <sys/types.h>
   9#include <unistd.h>
  10#include <sys/syscall.h>
  11#include <sched.h>
  12#include <sys/wait.h>
  13#include <sys/mount.h>
  14#include <sys/fcntl.h>
  15
  16#define STACK_SIZE (1024 * 1024)
  17static char child_stack[STACK_SIZE];
  18
  19static int test_current_pid_tgid(void *args)
  20{
  21        struct test_ns_current_pid_tgid__bss  *bss;
  22        struct test_ns_current_pid_tgid *skel;
  23        int err = -1, duration = 0;
  24        pid_t tgid, pid;
  25        struct stat st;
  26
  27        skel = test_ns_current_pid_tgid__open_and_load();
  28        if (CHECK(!skel, "skel_open_load", "failed to load skeleton\n"))
  29                goto cleanup;
  30
  31        pid = syscall(SYS_gettid);
  32        tgid = getpid();
  33
  34        err = stat("/proc/self/ns/pid", &st);
  35        if (CHECK(err, "stat", "failed /proc/self/ns/pid: %d\n", err))
  36                goto cleanup;
  37
  38        bss = skel->bss;
  39        bss->dev = st.st_dev;
  40        bss->ino = st.st_ino;
  41        bss->user_pid = 0;
  42        bss->user_tgid = 0;
  43
  44        err = test_ns_current_pid_tgid__attach(skel);
  45        if (CHECK(err, "skel_attach", "skeleton attach failed: %d\n", err))
  46                goto cleanup;
  47
  48        /* trigger tracepoint */
  49        usleep(1);
  50        ASSERT_EQ(bss->user_pid, pid, "pid");
  51        ASSERT_EQ(bss->user_tgid, tgid, "tgid");
  52        err = 0;
  53
  54cleanup:
  55         test_ns_current_pid_tgid__destroy(skel);
  56
  57        return err;
  58}
  59
  60static void test_ns_current_pid_tgid_new_ns(void)
  61{
  62        int wstatus, duration = 0;
  63        pid_t cpid;
  64
  65        /* Create a process in a new namespace, this process
  66         * will be the init process of this new namespace hence will be pid 1.
  67         */
  68        cpid = clone(test_current_pid_tgid, child_stack + STACK_SIZE,
  69                     CLONE_NEWPID | SIGCHLD, NULL);
  70
  71        if (CHECK(cpid == -1, "clone", "%s\n", strerror(errno)))
  72                return;
  73
  74        if (CHECK(waitpid(cpid, &wstatus, 0) == -1, "waitpid", "%s\n", strerror(errno)))
  75                return;
  76
  77        if (CHECK(WEXITSTATUS(wstatus) != 0, "newns_pidtgid", "failed"))
  78                return;
  79}
  80
  81void test_ns_current_pid_tgid(void)
  82{
  83        if (test__start_subtest("ns_current_pid_tgid_root_ns"))
  84                test_current_pid_tgid(NULL);
  85        if (test__start_subtest("ns_current_pid_tgid_new_ns"))
  86                test_ns_current_pid_tgid_new_ns();
  87}
  88