pidfd_setattr_test.c

 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
27FIXTURE(pidfs_setattr)
28{
29	pid_t child_pid;
30	int child_pidfd;
31};
32
33FIXTURE_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
42FIXTURE_TEARDOWN(pidfs_setattr)
43{
44	sys_waitid(P_PID, self->child_pid, NULL, WEXITED);
45	EXPECT_EQ(close(self->child_pidfd), 0);
46}
47
48TEST_F(pidfs_setattr, no_chown)
49{
50	ASSERT_LT(fchown(self->child_pidfd, 1234, 5678), 0);
51	ASSERT_EQ(errno, EOPNOTSUPP);
52}
53
54TEST_F(pidfs_setattr, no_chmod)
55{
56	ASSERT_LT(fchmod(self->child_pidfd, 0777), 0);
57	ASSERT_EQ(errno, EOPNOTSUPP);
58}
59
60TEST_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
69TEST_HARNESS_MAIN