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)
17 static char child_stack[STACK_SIZE];
18
test_current_pid_tgid(void * args)19 static 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
54 cleanup:
55 test_ns_current_pid_tgid__destroy(skel);
56
57 return err;
58 }
59
test_ns_current_pid_tgid_new_ns(void)60 static 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 */
serial_test_ns_current_pid_tgid(void)82 void 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