1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
|
/*
* Check decoding of dup syscall.
*
* Copyright (c) 2016-2021 The strace developers.
* All rights reserved.
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "tests.h"
#include "scno.h"
#include <stdio.h>
#include <unistd.h>
#ifndef FD0_PATH
# define FD0_PATH ""
#endif
#ifndef FD9_PATH
# define FD9_PATH ""
#endif
#ifndef SKIP_IF_PROC_IS_UNAVAILABLE
# define SKIP_IF_PROC_IS_UNAVAILABLE
#endif
#ifndef TRACE_FDS
# define TRACE_FDS 0
#endif
#ifndef PATH_TRACING
# define PATH_TRACING 0
#endif
#ifndef TRACE_FD_0
# define TRACE_FD_0 (!TRACE_FDS && !PATH_TRACING)
#endif
#ifndef TRACE_OTHER_FDS
# define TRACE_OTHER_FDS (!TRACE_FDS && !PATH_TRACING)
#endif
#ifndef TRACE_FD_9
# define TRACE_FD_9 (!TRACE_FDS && !PATH_TRACING)
#endif
static const char *errstr;
static long
k_dup(const unsigned int fd)
{
const kernel_ulong_t fill = (kernel_ulong_t) 0xdefaced00000000ULL;
const kernel_ulong_t bad = (kernel_ulong_t) 0xbadc0dedbadc0dedULL;
const kernel_ulong_t arg1 = fill | fd;
const long rc = syscall(__NR_dup, arg1, bad, bad, bad, bad, bad);
errstr = sprintrc(rc);
return rc;
}
int
main(void)
{
SKIP_IF_PROC_IS_UNAVAILABLE;
k_dup(-1);
#if !PATH_TRACING && !TRACE_FDS
printf("dup(-1) = %s\n", errstr);
#endif
int d1 = k_dup(0);
#if TRACE_FD_0
printf("dup(0" FD0_PATH ") = %d" FD0_PATH "\n", d1);
#endif
int d2 = k_dup(d1);
#if TRACE_OTHER_FDS
printf("dup(%d" FD0_PATH ") = %d" FD0_PATH "\n", d1, d2);
#endif
d2 = k_dup(9);
#if PATH_TRACING || TRACE_FD_9
printf("dup(9" FD9_PATH ") = %d" FD9_PATH "\n", d2);
#endif
d1 = k_dup(d2);
#if PATH_TRACING || TRACE_OTHER_FDS
printf("dup(%d" FD9_PATH ") = %d" FD9_PATH "\n", d2, d1);
#endif
puts("+++ exited with 0 +++");
return 0;
}
|
