1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright (c) 2020 Viresh Kumar <viresh.kumar@linaro.org>
4 *
5 * openat2() tests with various resolve flags.
6 */
7#include "tst_test.h"
8#include "lapi/openat2.h"
9
10#define FOO_SYMLINK "foo_symlink"
11
12static struct open_how *how;
13
14static struct tcase {
15	const char *name;
16	const char *pathname;
17	uint64_t resolve;
18	int exp_errno;
19} tcases[] = {
20	/* Success cases */
21	{"open /proc/version", "/proc/version", 0, 0},
22	{"open magiclinks", "/proc/self/exe", 0, 0},
23	{"open symlinks", FOO_SYMLINK, 0, 0},
24
25	/* Failure cases */
26	{"resolve-no-xdev", "/proc/version", RESOLVE_NO_XDEV, EXDEV},
27	{"resolve-no-magiclinks", "/proc/self/exe", RESOLVE_NO_MAGICLINKS, ELOOP},
28	{"resolve-no-symlinks", FOO_SYMLINK, RESOLVE_NO_SYMLINKS, ELOOP},
29	{"resolve-beneath", "/proc/version", RESOLVE_BENEATH, EXDEV},
30	{"resolve-beneath", "../foo", RESOLVE_BENEATH, EXDEV},
31	{"resolve-no-in-root", "/proc/version", RESOLVE_IN_ROOT, ENOENT},
32};
33
34static void setup(void)
35{
36	openat2_supported_by_kernel();
37	SAFE_SYMLINK("/proc/version", FOO_SYMLINK);
38}
39
40static void run(unsigned int n)
41{
42	struct tcase *tc = &tcases[n];
43
44	how->flags = O_RDONLY | O_CREAT;
45	how->mode = S_IRUSR;
46	how->resolve = tc->resolve;
47
48	TEST(openat2(AT_FDCWD, tc->pathname, how, sizeof(*how)));
49
50	if (!tc->exp_errno) {
51		if (TST_RET < 0) {
52			tst_res(TFAIL | TTERRNO, "%s: openat2() failed",
53				tc->name);
54			return;
55		}
56
57		SAFE_CLOSE(TST_RET);
58		tst_res(TPASS, "%s: openat2() passed", tc->name);
59	} else {
60		if (TST_RET >= 0) {
61			SAFE_CLOSE(TST_RET);
62			tst_res(TFAIL, "%s: openat2() passed unexpectedly",
63				tc->name);
64			return;
65		}
66
67		if (tc->exp_errno != TST_ERR) {
68			tst_res(TFAIL | TTERRNO, "%s: openat2() should fail with %s",
69				tc->name, tst_strerrno(tc->exp_errno));
70			return;
71		}
72
73		tst_res(TPASS | TTERRNO, "%s: openat2() failed as expected",
74			tc->name);
75	}
76}
77
78static struct tst_test test = {
79	.tcnt = ARRAY_SIZE(tcases),
80	.test = run,
81	.setup = setup,
82	.needs_tmpdir = 1,
83	.bufs = (struct tst_buffers []) {
84		{&how, .size = sizeof(*how)},
85		{},
86	}
87};
88