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
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
|
/*
* Check decoding of faccessat syscall.
*
* Copyright (c) 2016-2020 The strace developers.
* All rights reserved.
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "tests.h"
#include "scno.h"
#ifdef __NR_faccessat
# include <fcntl.h>
# include <stdio.h>
# include <unistd.h>
# ifndef FD_PATH
# define FD_PATH ""
# endif
# ifndef SKIP_IF_PROC_IS_UNAVAILABLE
# define SKIP_IF_PROC_IS_UNAVAILABLE
# endif
static const char *errstr;
static long
k_faccessat(const unsigned int dirfd,
const void *const pathname,
const unsigned int mode)
{
const kernel_ulong_t fill = (kernel_ulong_t) 0xdefaced00000000ULL;
const kernel_ulong_t bad = (kernel_ulong_t) 0xbadc0dedbadc0dedULL;
const kernel_ulong_t arg1 = fill | dirfd;
const kernel_ulong_t arg2 = (uintptr_t) pathname;
const kernel_ulong_t arg3 = fill | mode;
const long rc = syscall(__NR_faccessat,
arg1, arg2, arg3, bad, bad, bad);
errstr = sprintrc(rc);
return rc;
}
int
main(void)
{
SKIP_IF_PROC_IS_UNAVAILABLE;
TAIL_ALLOC_OBJECT_CONST_PTR(const char, unterminated);
char *unterminated_str;
if (asprintf(&unterminated_str, "%p", unterminated) < 0)
perror_msg_and_fail("asprintf");
const void *const efault = unterminated + 1;
char *efault_str;
if (asprintf(&efault_str, "%p", efault) < 0)
perror_msg_and_fail("asprintf");
typedef struct {
char sym;
char null;
} sym_null;
TAIL_ALLOC_OBJECT_CONST_PTR(sym_null, dot);
dot->sym = '.';
dot->null = '\0';
const char *const null = &dot->null;
TAIL_ALLOC_OBJECT_CONST_PTR(sym_null, slash);
slash->sym = '/';
slash->null = '\0';
static const char path[] = "/dev/full";
const char *const fd_path = tail_memdup(path, sizeof(path));
int fd = open(path, O_WRONLY);
if (fd < 0)
perror_msg_and_fail("open: %s", path);
char *fd_str;
if (asprintf(&fd_str, "%d%s", fd, FD_PATH) < 0)
perror_msg_and_fail("asprintf");
char *path_quoted;
if (asprintf(&path_quoted, "\"%s\"", path) < 0)
perror_msg_and_fail("asprintf");
struct {
int val;
const char *str;
} dirfds[] = {
{ ARG_STR(-1) },
{ -100, "AT_FDCWD" },
{ fd, fd_str },
}, modes[] = {
{ ARG_STR(F_OK) },
{ ARG_STR(R_OK) },
{ ARG_STR(W_OK) },
{ ARG_STR(X_OK) },
{ ARG_STR(R_OK|W_OK) },
{ ARG_STR(R_OK|X_OK) },
{ ARG_STR(W_OK|X_OK) },
{ ARG_STR(R_OK|W_OK|X_OK) },
{ 8, "0x8 /* ?_OK */" },
{ -1, "R_OK|W_OK|X_OK|0xfffffff8" },
};
struct {
const void *val;
const char *str;
} paths[] = {
{ 0, "NULL" },
{ efault, efault_str },
{ unterminated, unterminated_str },
{ null, "\"\"" },
{ &dot->sym, "\".\"" },
{ &slash->sym, "\"/\"" },
{ fd_path, path_quoted },
};
for (unsigned int dirfd_i = 0;
dirfd_i < ARRAY_SIZE(dirfds);
++dirfd_i) {
for (unsigned int path_i = 0;
path_i < ARRAY_SIZE(paths);
++path_i) {
for (unsigned int mode_i = 0;
mode_i < ARRAY_SIZE(modes);
++mode_i) {
k_faccessat(dirfds[dirfd_i].val,
paths[path_i].val,
modes[mode_i].val);
# ifdef PATH_TRACING
if (dirfds[dirfd_i].val == fd ||
paths[path_i].val == fd_path)
# endif
printf("faccessat(%s, %s, %s) = %s\n",
dirfds[dirfd_i].str,
paths[path_i].str,
modes[mode_i].str,
errstr);
}
}
}
puts("+++ exited with 0 +++");
return 0;
}
#else
SKIP_MAIN_UNDEFINED("__NR_faccessat")
#endif
|
