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1/* Check non representable OFD locks regions in non-LFS mode for compat
2 mode (BZ #20251)
3 Copyright (C) 2018-2019 Free Software Foundation, Inc.
4
5 This program is free software; you can redistribute it and/or
6 modify it under the terms of the GNU General Public License
7 as published by the Free Software Foundation; either version 2
8 of the License, or (at your option) any later version.
9
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
14
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, see <http://www.gnu.org/licenses/>.
17*/
18
19#include <unistd.h>
20#include <fcntl.h>
21#include <stdint.h>
22#include <errno.h>
23
24#include <support/temp_file.h>
25#include <support/check.h>
26
27#include <shlib-compat.h>
28#if TEST_COMPAT (libc, GLIBC_2_0, GLIBC_2_28)
29compat_symbol_reference (libc, fcntl, fcntl, GLIBC_2_0);
30
31static char *temp_filename;
32static int temp_fd;
33
34static void
35do_prepare (int argc, char **argv)
36{
37 temp_fd = create_temp_file ("tst-ofdlocks-compat.", &temp_filename);
38 TEST_VERIFY_EXIT (temp_fd != -1);
39}
40
41#define PREPARE do_prepare
42
43/* Linux between 4.13 and 4.15 return EOVERFLOW for LFS OFD locks usage
44 in compat mode (non-LFS ABI running on a LFS default kernel, such as
45 i386 on a x86_64 kernel or s390-32 on a s390-64 kernel) [1]. This is
46 a kernel issue because __NR_fcntl64 is the expected way to use OFD locks
47 (used on GLIBC for both fcntl and fcntl64).
48
49 [1] https://sourceware.org/ml/libc-alpha/2018-07/msg00243.html */
50
51static int
52do_test (void)
53{
54 /* The compat fcntl version for architectures which support non-LFS
55 operations does not wrap the flock OFD argument, so the struct is passed
56 unmodified to kernel. It means no EOVERFLOW is returned, so operations
57 with LFS should not incur in failure. */
58
59 struct flock64 lck64 = {
60 .l_type = F_WRLCK,
61 .l_whence = SEEK_SET,
62 .l_start = (off64_t)INT32_MAX + 1024,
63 .l_len = 1024,
64 };
65 int ret = fcntl (temp_fd, F_OFD_SETLKW, &lck64);
66 if (ret == -1 && errno == EINVAL)
67 /* OFD locks are only available on Linux 3.15. */
68 FAIL_UNSUPPORTED ("fcntl (F_OFD_SETLKW) not supported");
69
70 TEST_VERIFY_EXIT (ret == 0);
71
72 /* Open file description locks placed through the same open file description
73 (either by same file descriptor or a duplicated one created by fork,
74 dup, fcntl F_DUPFD, etc.) overwrites then old lock. To force a
75 conflicting lock combination, it creates a new file descriptor. */
76 int fd = open64 (temp_filename, O_RDWR, 0666);
77 TEST_VERIFY_EXIT (fd != -1);
78
79 struct flock64 lck = {
80 .l_type = F_WRLCK,
81 .l_whence = SEEK_SET,
82 .l_start = INT32_MAX - 1024,
83 .l_len = 4 * 1024,
84 };
85 TEST_VERIFY (fcntl (fd, F_OFD_GETLK, &lck) == 0);
86
87 return 0;
88}
89#else
90static int
91do_test (void)
92{
93 return 77;
94}
95#endif
96
97#include <support/test-driver.c>
98

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