1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (c) Linux Test Project, 2003-2024
4 * Copyright (c) Wipro Technologies Ltd, 2002
5 * Author: Subhab Biswas <[email protected]>
6 */
7
8 /*\
9 * [Description]
10 *
11 * This is a basic test for iopl(2) system call.
12 *
13 * Test the system call for possible privilege levels.
14 * As the privilege level for a normal process is 0, start by
15 * setting/changing the level to 0.
16 */
17
18 #include <errno.h>
19 #include <unistd.h>
20
21 #include "tst_test.h"
22
23 #if defined __i386__ || defined(__x86_64__)
24 #include <sys/io.h>
25
verify_iopl(void)26 static void verify_iopl(void)
27 {
28 int total_level = 4;
29 int level;
30
31 for (level = 0; level < total_level; ++level) {
32
33 TEST(iopl(level));
34
35 if (TST_RET == -1) {
36 tst_res(TFAIL | TTERRNO, "iopl() failed for level %d, "
37 "errno=%d : %s", level,
38 TST_ERR, tst_strerrno(TST_ERR));
39 } else {
40 tst_res(TPASS, "iopl() passed for level %d, "
41 "returned %ld", level, TST_RET);
42 }
43 }
44 }
45
cleanup(void)46 static void cleanup(void)
47 {
48 /*
49 * back to I/O privilege for normal process.
50 */
51 if (iopl(0) == -1)
52 tst_res(TWARN, "iopl() cleanup failed");
53 }
54
55 static struct tst_test test = {
56 .test_all = verify_iopl,
57 .needs_root = 1,
58 /* iopl() is restricted under kernel lockdown. */
59 .skip_in_lockdown = 1,
60 .cleanup = cleanup,
61 };
62
63 #else
64 TST_TEST_TCONF("LSB v1.3 does not specify iopl() for this architecture. (only for i386 or x86_64)");
65 #endif /* __i386_, __x86_64__*/
66