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 */
6 /*
7 * Verify that lseek64() call succeeds to set the file pointer position to an
8 * offset larger than file size limit (RLIMIT_FSIZE). Also, verify that any
9 * attempt to write to this location fails.
10 */
11
12 #ifndef _GNU_SOURCE
13 #define _GNU_SOURCE
14 #endif
15
16 #include <sys/types.h>
17 #include <unistd.h>
18 #include <stdio.h>
19
20 #include "tst_test.h"
21
22 #define TEMP_FILE "tmp_file"
23 #define FILE_MODE 0644
24
25 static char write_buff[BUFSIZ];
26 static int fildes;
27
verify_llseek(void)28 static void verify_llseek(void)
29 {
30 TEST(lseek64(fildes, (loff_t) (80 * BUFSIZ), SEEK_SET));
31 if (TST_RET == (80 * BUFSIZ))
32 tst_res(TPASS, "lseek64() can set file pointer position larger than file size limit");
33 else
34 tst_res(TFAIL, "lseek64() returned wrong value %ld when write past file size", TST_RET);
35
36 if (write(fildes, write_buff, BUFSIZ) == -1)
37 tst_res(TPASS,"write failed after file size limit");
38 else
39 tst_brk(TFAIL, "write successful after file size limit");
40
41 TEST(lseek64(fildes, (loff_t) BUFSIZ, SEEK_SET));
42 if (TST_RET == BUFSIZ)
43 tst_res(TPASS,"lseek64() can set file pointer position under filer size limit");
44 else
45 tst_brk(TFAIL,"lseek64() returns wrong value %ld when write under file size", TST_RET);
46
47 if (write(fildes, write_buff, BUFSIZ) != -1)
48 tst_res(TPASS, "write succcessfully under file size limit");
49 else
50 tst_brk(TFAIL, "write failed under file size limit");
51
52 if (write(fildes, write_buff, BUFSIZ) == -1)
53 tst_res(TPASS, "write failed after file size limit");
54 else
55 tst_brk(TFAIL, "write successfully after file size limit");
56 }
57
setup(void)58 static void setup(void)
59 {
60 struct sigaction act;
61 struct rlimit rlp;
62
63 act.sa_handler = SIG_IGN;
64 act.sa_flags = 0;
65 sigemptyset(&act.sa_mask);
66 SAFE_SIGACTION(SIGXFSZ, &act, NULL);
67
68 rlp.rlim_cur = rlp.rlim_max = 2 * BUFSIZ;
69 SAFE_SETRLIMIT(RLIMIT_FSIZE, &rlp);
70
71 fildes = SAFE_OPEN(TEMP_FILE, O_RDWR | O_CREAT, FILE_MODE);
72
73 SAFE_WRITE(1, fildes, write_buff, BUFSIZ);
74 }
75
76 static struct tst_test test = {
77 .setup = setup,
78 .needs_tmpdir = 1,
79 .test_all = verify_llseek,
80 };
81