1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright (c) International Business Machines  Corp., 2001
4 *  07/2001 Ported by Wayne Boyer
5 *  05/2019 Ported to new library: Christian Amann <camann@suse.com>
6 */
7/*
8 * Tests different error scenarios:
9 *
10 * 1) Calls fstat() with closed file descriptor
11 *    -> EBADF
12 * 2) Calls fstat() with an invalid address for stat structure
13 *    -> EFAULT (or receive signal SIGSEGV)
14 */
15
16#include <errno.h>
17#include <stdlib.h>
18#include <unistd.h>
19#include <wait.h>
20#include <sys/types.h>
21#include <sys/stat.h>
22#include "tst_test.h"
23#include "tst_safe_macros.h"
24
25#define TESTFILE	"test_file"
26
27static int fd_ok;
28static int fd_ebadf = -1;
29static struct stat stat_buf;
30
31static struct tcase {
32	int *fd;
33	struct stat *stat_buf;
34	int exp_err;
35} tcases[] = {
36	{&fd_ebadf, &stat_buf, EBADF},
37	{&fd_ok, NULL, EFAULT},
38};
39
40static void check_fstat(unsigned int tc_num)
41{
42	struct tcase *tc = &tcases[tc_num];
43
44	TEST(fstat(*tc->fd, tc->stat_buf));
45	if (TST_RET == -1) {
46		if (tc->exp_err == TST_ERR) {
47			tst_res(TPASS,
48				 "fstat() fails with expected error %s",
49				 tst_strerrno(tc->exp_err));
50		} else {
51			tst_res(TFAIL | TTERRNO,
52				 "fstat() did not fail with %s, but with",
53				 tst_strerrno(tc->exp_err));
54		}
55	} else {
56		tst_res(TFAIL, "fstat() returned %ld, expected -1",
57			 TST_RET);
58	}
59}
60
61static void run(unsigned int tc_num)
62{
63	pid_t pid;
64	int status;
65
66	pid = SAFE_FORK();
67	if (pid == 0) {
68		check_fstat(tc_num);
69		return;
70	}
71	SAFE_WAITPID(pid, &status, 0);
72
73	if (tcases[tc_num].exp_err == EFAULT && WTERMSIG(status) == SIGSEGV) {
74		tst_res(TPASS, "fstat() failed as expected with SIGSEGV");
75		return;
76	}
77
78	if (WIFEXITED(status) && WEXITSTATUS(status) == 0)
79		return;
80
81	tst_res(TFAIL, "child %s", tst_strstatus(status));
82}
83
84static void setup(void)
85{
86	fd_ok = SAFE_OPEN(TESTFILE, O_RDWR | O_CREAT, 0644);
87}
88
89static void cleanup(void)
90{
91	if (fd_ok > 0)
92		SAFE_CLOSE(fd_ok);
93}
94
95static struct tst_test test = {
96	.test = run,
97	.tcnt = ARRAY_SIZE(tcases),
98	.setup = setup,
99	.cleanup = cleanup,
100	.needs_tmpdir = 1,
101	.forks_child = 1,
102};
103