anon_inode_test.c

 1// SPDX-License-Identifier: GPL-2.0
 2#define _GNU_SOURCE
 3#define __SANE_USERSPACE_TYPES__
 4
 5#include <fcntl.h>
 6#include <stdio.h>
 7#include <sys/stat.h>
 8
 9#include "kselftest_harness.h"
10#include "wrappers.h"
11
12TEST(anon_inode_no_chown)
13{
14	int fd_context;
15
16	fd_context = sys_fsopen("tmpfs", 0);
17	ASSERT_GE(fd_context, 0);
18
19	ASSERT_LT(fchown(fd_context, 1234, 5678), 0);
20	ASSERT_EQ(errno, EOPNOTSUPP);
21
22	EXPECT_EQ(close(fd_context), 0);
23}
24
25TEST(anon_inode_no_chmod)
26{
27	int fd_context;
28
29	fd_context = sys_fsopen("tmpfs", 0);
30	ASSERT_GE(fd_context, 0);
31
32	ASSERT_LT(fchmod(fd_context, 0777), 0);
33	ASSERT_EQ(errno, EOPNOTSUPP);
34
35	EXPECT_EQ(close(fd_context), 0);
36}
37
38TEST(anon_inode_no_exec)
39{
40	int fd_context;
41
42	fd_context = sys_fsopen("tmpfs", 0);
43	ASSERT_GE(fd_context, 0);
44
45	ASSERT_LT(execveat(fd_context, "", NULL, NULL, AT_EMPTY_PATH), 0);
46	ASSERT_EQ(errno, EACCES);
47
48	EXPECT_EQ(close(fd_context), 0);
49}
50
51TEST(anon_inode_no_open)
52{
53	int fd_context;
54
55	fd_context = sys_fsopen("tmpfs", 0);
56	ASSERT_GE(fd_context, 0);
57
58	ASSERT_GE(dup2(fd_context, 500), 0);
59	ASSERT_EQ(close(fd_context), 0);
60	fd_context = 500;
61
62	ASSERT_LT(open("/proc/self/fd/500", 0), 0);
63	ASSERT_EQ(errno, ENXIO);
64
65	EXPECT_EQ(close(fd_context), 0);
66}
67
68TEST_HARNESS_MAIN
69