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
|
/*
* Check decoding of landlock_add_rule syscall.
*
* Copyright (c) 2021 Eugene Syromyatnikov <evgsyr@gmail.com>
* Copyright (c) 2021-2023 The strace developers.
* All rights reserved.
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "tests.h"
#include "scno.h"
#include <inttypes.h>
#include <stdio.h>
#include <stdint.h>
#include <unistd.h>
#include <linux/landlock.h>
#ifndef SKIP_IF_PROC_IS_UNAVAILABLE
# define SKIP_IF_PROC_IS_UNAVAILABLE
#endif
#ifndef FD0_STR
# define FD0_STR ""
#endif
#ifndef RULESET_FD
# define RULESET_FD -1
#endif
#ifndef RULESET_FD_STR
# define RULESET_FD_STR "-1"
#endif
#ifndef PARENT_FD
# define PARENT_FD -1
#endif
#ifndef PARENT_FD_STR
# define PARENT_FD_STR "-1"
#endif
static const char *errstr;
static long
sys_landlock_add_rule(int ruleset_fd, unsigned int rule_type, void *rule_attr,
unsigned int flags)
{
static const kernel_ulong_t fill =
(kernel_ulong_t) 0xd1efaced00000000ULL;
kernel_ulong_t arg1 = fill | (unsigned int) ruleset_fd;
kernel_ulong_t arg2 = fill | rule_type;
kernel_ulong_t arg3 = (uintptr_t) rule_attr;
kernel_ulong_t arg4 = fill | flags;
kernel_ulong_t arg5 = fill | 0xdecaffed;
kernel_ulong_t arg6 = fill | 0xdeefaced;
long rc = syscall(__NR_landlock_add_rule,
arg1, arg2, arg3, arg4, arg5, arg6);
errstr = sprintrc(rc);
return rc;
}
int
main(void)
{
SKIP_IF_PROC_IS_UNAVAILABLE;
TAIL_ALLOC_OBJECT_VAR_PTR(struct landlock_path_beneath_attr, attr);
/* All zeroes */
sys_landlock_add_rule(0, 0, NULL, 0);
printf("landlock_add_rule(0" FD0_STR ", 0 /* LANDLOCK_RULE_??? */"
", NULL, 0) = %s\n", errstr);
/* Bogus values */
sys_landlock_add_rule(0xdeadc0de, 0xfacebeef, attr + 1, 1);
printf("landlock_add_rule(-559038242"
", 0xfacebeef /* LANDLOCK_RULE_??? */, %p, 0x1) = %s\n",
attr + 1, errstr);
sys_landlock_add_rule(1729, 2, attr + 1, 0xffffffff);
printf("landlock_add_rule(1729, 0x2 /* LANDLOCK_RULE_??? */, %p"
", 0xffffffff) = %s\n",
attr + 1, errstr);
/* Invalid pointer */
sys_landlock_add_rule(RULESET_FD, LANDLOCK_RULE_PATH_BENEATH,
attr + 1, 0);
printf("landlock_add_rule(" RULESET_FD_STR
", LANDLOCK_RULE_PATH_BENEATH, %p, 0) = %s\n",
attr + 1, errstr);
/* Short read */
sys_landlock_add_rule(RULESET_FD, LANDLOCK_RULE_PATH_BENEATH,
(char *) attr + 4, 0);
printf("landlock_add_rule(" RULESET_FD_STR
", LANDLOCK_RULE_PATH_BENEATH, %p, 0) = %s\n",
(char *) attr + 4, errstr);
/* Valid attr ptr */
static const struct {
uint64_t val;
const char *str;
} attr_vals[] = {
{ ARG_STR(LANDLOCK_ACCESS_FS_EXECUTE) },
{ ARG_ULL_STR(LANDLOCK_ACCESS_FS_EXECUTE|LANDLOCK_ACCESS_FS_READ_FILE|LANDLOCK_ACCESS_FS_READ_DIR|LANDLOCK_ACCESS_FS_REMOVE_FILE|LANDLOCK_ACCESS_FS_MAKE_CHAR|LANDLOCK_ACCESS_FS_MAKE_DIR|LANDLOCK_ACCESS_FS_MAKE_SOCK|LANDLOCK_ACCESS_FS_MAKE_FIFO|LANDLOCK_ACCESS_FS_MAKE_BLOCK|LANDLOCK_ACCESS_FS_MAKE_SYM|LANDLOCK_ACCESS_FS_REFER|LANDLOCK_ACCESS_FS_TRUNCATE|0xdebeefeddeca8000) },
{ ARG_ULL_STR(0xdebeefeddeca8000)
" /* LANDLOCK_ACCESS_FS_??? */" },
};
static const struct {
int val;
const char *str;
} parent_fd_vals[] = {
{ ARG_STR(-1) },
{ ARG_STR(11630) },
{ PARENT_FD, PARENT_FD_STR },
};
for (size_t i = 0; i < ARRAY_SIZE(attr_vals); i++) {
for (size_t j = 0; j < ARRAY_SIZE(parent_fd_vals); j++) {
attr->allowed_access = attr_vals[i].val;
attr->parent_fd = parent_fd_vals[j].val;
sys_landlock_add_rule(RULESET_FD,
LANDLOCK_RULE_PATH_BENEATH,
attr, 0);
printf("landlock_add_rule(" RULESET_FD_STR
", LANDLOCK_RULE_PATH_BENEATH"
", {allowed_access=%s, parent_fd=%s}, 0) = %s\n",
attr_vals[i].str, parent_fd_vals[j].str, errstr);
}
}
puts("+++ exited with 0 +++");
return 0;
}
|
