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
81/* TODO: use a different tracepoint */
82void serial_test_ns_current_pid_tgid(void)
83{
84	if (test__start_subtest("ns_current_pid_tgid_root_ns"))
85		test_current_pid_tgid(NULL);
86	if (test__start_subtest("ns_current_pid_tgid_new_ns"))
87		test_ns_current_pid_tgid_new_ns();
88}
89