1 // SPDX-License-Identifier: GPL-2.0
2
3 #define _GNU_SOURCE
4 #include <errno.h>
5 #include <fcntl.h>
6 #include <limits.h>
7 #include <linux/types.h>
8 #include <poll.h>
9 #include <pthread.h>
10 #include <sched.h>
11 #include <signal.h>
12 #include <stdio.h>
13 #include <stdlib.h>
14 #include <string.h>
15 #include <syscall.h>
16 #include <sys/prctl.h>
17 #include <sys/wait.h>
18 #include <unistd.h>
19 #include <sys/socket.h>
20 #include <linux/kcmp.h>
21 #include <sys/stat.h>
22 #include <sys/xattr.h>
23
24 #include "pidfd.h"
25 #include "../kselftest_harness.h"
26
FIXTURE(pidfs_setattr)27 FIXTURE(pidfs_setattr)
28 {
29 pid_t child_pid;
30 int child_pidfd;
31 };
32
FIXTURE_SETUP(pidfs_setattr)33 FIXTURE_SETUP(pidfs_setattr)
34 {
35 self->child_pid = create_child(&self->child_pidfd, CLONE_NEWUSER | CLONE_NEWPID);
36 EXPECT_GE(self->child_pid, 0);
37
38 if (self->child_pid == 0)
39 _exit(EXIT_SUCCESS);
40 }
41
FIXTURE_TEARDOWN(pidfs_setattr)42 FIXTURE_TEARDOWN(pidfs_setattr)
43 {
44 sys_waitid(P_PID, self->child_pid, NULL, WEXITED);
45 EXPECT_EQ(close(self->child_pidfd), 0);
46 }
47
TEST_F(pidfs_setattr,no_chown)48 TEST_F(pidfs_setattr, no_chown)
49 {
50 ASSERT_LT(fchown(self->child_pidfd, 1234, 5678), 0);
51 ASSERT_EQ(errno, EOPNOTSUPP);
52 }
53
TEST_F(pidfs_setattr,no_chmod)54 TEST_F(pidfs_setattr, no_chmod)
55 {
56 ASSERT_LT(fchmod(self->child_pidfd, 0777), 0);
57 ASSERT_EQ(errno, EOPNOTSUPP);
58 }
59
TEST_F(pidfs_setattr,no_exec)60 TEST_F(pidfs_setattr, no_exec)
61 {
62 char *const argv[] = { NULL };
63 char *const envp[] = { NULL };
64
65 ASSERT_LT(execveat(self->child_pidfd, "", argv, envp, AT_EMPTY_PATH), 0);
66 ASSERT_EQ(errno, EACCES);
67 }
68
69 TEST_HARNESS_MAIN
70