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
|
// SPDX-License-Identifier: GPL-2.0
/* Converted from tools/testing/selftests/bpf/verifier/div_overflow.c */
#include <linux/bpf.h>
#include <bpf/bpf_helpers.h>
#include <limits.h>
#include "bpf_misc.h"
/* Just make sure that JITs used udiv/umod as otherwise we get
* an exception from INT_MIN/-1 overflow similarly as with div
* by zero.
*/
SEC("tc")
__description("DIV32 overflow, check 1")
__success __retval(0)
__naked void div32_overflow_check_1(void)
{
asm volatile (" \
w1 = -1; \
w0 = %[int_min]; \
w0 /= w1; \
exit; \
" :
: __imm_const(int_min, INT_MIN)
: __clobber_all);
}
SEC("tc")
__description("DIV32 overflow, check 2")
__success __retval(0)
__naked void div32_overflow_check_2(void)
{
asm volatile (" \
w0 = %[int_min]; \
w0 /= -1; \
exit; \
" :
: __imm_const(int_min, INT_MIN)
: __clobber_all);
}
SEC("tc")
__description("DIV64 overflow, check 1")
__success __retval(0)
__naked void div64_overflow_check_1(void)
{
asm volatile (" \
r1 = -1; \
r2 = %[llong_min] ll; \
r2 /= r1; \
w0 = 0; \
if r0 == r2 goto l0_%=; \
w0 = 1; \
l0_%=: exit; \
" :
: __imm_const(llong_min, LLONG_MIN)
: __clobber_all);
}
SEC("tc")
__description("DIV64 overflow, check 2")
__success __retval(0)
__naked void div64_overflow_check_2(void)
{
asm volatile (" \
r1 = %[llong_min] ll; \
r1 /= -1; \
w0 = 0; \
if r0 == r1 goto l0_%=; \
w0 = 1; \
l0_%=: exit; \
" :
: __imm_const(llong_min, LLONG_MIN)
: __clobber_all);
}
SEC("tc")
__description("MOD32 overflow, check 1")
__success __retval(INT_MIN)
__naked void mod32_overflow_check_1(void)
{
asm volatile (" \
w1 = -1; \
w0 = %[int_min]; \
w0 %%= w1; \
exit; \
" :
: __imm_const(int_min, INT_MIN)
: __clobber_all);
}
SEC("tc")
__description("MOD32 overflow, check 2")
__success __retval(INT_MIN)
__naked void mod32_overflow_check_2(void)
{
asm volatile (" \
w0 = %[int_min]; \
w0 %%= -1; \
exit; \
" :
: __imm_const(int_min, INT_MIN)
: __clobber_all);
}
SEC("tc")
__description("MOD64 overflow, check 1")
__success __retval(1)
__naked void mod64_overflow_check_1(void)
{
asm volatile (" \
r1 = -1; \
r2 = %[llong_min] ll; \
r3 = r2; \
r2 %%= r1; \
w0 = 0; \
if r3 != r2 goto l0_%=; \
w0 = 1; \
l0_%=: exit; \
" :
: __imm_const(llong_min, LLONG_MIN)
: __clobber_all);
}
SEC("tc")
__description("MOD64 overflow, check 2")
__success __retval(1)
__naked void mod64_overflow_check_2(void)
{
asm volatile (" \
r2 = %[llong_min] ll; \
r3 = r2; \
r2 %%= -1; \
w0 = 0; \
if r3 != r2 goto l0_%=; \
w0 = 1; \
l0_%=: exit; \
" :
: __imm_const(llong_min, LLONG_MIN)
: __clobber_all);
}
char _license[] SEC("license") = "GPL";
|
