1 // SPDX-License-Identifier: GPL-2.0
2 /* Converted from tools/testing/selftests/bpf/verifier/value.c */
3
4 #include <linux/bpf.h>
5 #include <bpf/bpf_helpers.h>
6 #include "bpf_misc.h"
7
8 #define MAX_ENTRIES 11
9
10 struct test_val {
11 unsigned int index;
12 int foo[MAX_ENTRIES];
13 };
14
15 struct {
16 __uint(type, BPF_MAP_TYPE_HASH);
17 __uint(max_entries, 1);
18 __type(key, long long);
19 __type(value, struct test_val);
20 } map_hash_48b SEC(".maps");
21
22 SEC("socket")
23 __description("map element value store of cleared call register")
24 __failure __msg("R1 !read_ok")
25 __failure_unpriv __msg_unpriv("R1 !read_ok")
26 __naked void store_of_cleared_call_register(void)
27 {
28 asm volatile (" \
29 r2 = r10; \
30 r2 += -8; \
31 r1 = 0; \
32 *(u64*)(r2 + 0) = r1; \
33 r1 = %[map_hash_48b] ll; \
34 call %[bpf_map_lookup_elem]; \
35 if r0 == 0 goto l0_%=; \
36 *(u64*)(r0 + 0) = r1; \
37 l0_%=: exit; \
38 " :
39 : __imm(bpf_map_lookup_elem),
40 __imm_addr(map_hash_48b)
41 : __clobber_all);
42 }
43
44 SEC("socket")
45 __description("map element value with unaligned store")
46 __success __failure_unpriv __msg_unpriv("R0 leaks addr")
47 __retval(0) __flag(BPF_F_ANY_ALIGNMENT)
48 __naked void element_value_with_unaligned_store(void)
49 {
50 asm volatile (" \
51 r2 = r10; \
52 r2 += -8; \
53 r1 = 0; \
54 *(u64*)(r2 + 0) = r1; \
55 r1 = %[map_hash_48b] ll; \
56 call %[bpf_map_lookup_elem]; \
57 if r0 == 0 goto l0_%=; \
58 r0 += 3; \
59 r1 = 42; \
60 *(u64*)(r0 + 0) = r1; \
61 r1 = 43; \
62 *(u64*)(r0 + 2) = r1; \
63 r1 = 44; \
64 *(u64*)(r0 - 2) = r1; \
65 r8 = r0; \
66 r1 = 32; \
67 *(u64*)(r8 + 0) = r1; \
68 r1 = 33; \
69 *(u64*)(r8 + 2) = r1; \
70 r1 = 34; \
71 *(u64*)(r8 - 2) = r1; \
72 r8 += 5; \
73 r1 = 22; \
74 *(u64*)(r8 + 0) = r1; \
75 r1 = 23; \
76 *(u64*)(r8 + 4) = r1; \
77 r1 = 24; \
78 *(u64*)(r8 - 7) = r1; \
79 r7 = r8; \
80 r7 += 3; \
81 r1 = 22; \
82 *(u64*)(r7 + 0) = r1; \
83 r1 = 23; \
84 *(u64*)(r7 + 4) = r1; \
85 r1 = 24; \
86 *(u64*)(r7 - 4) = r1; \
87 l0_%=: exit; \
88 " :
89 : __imm(bpf_map_lookup_elem),
90 __imm_addr(map_hash_48b)
91 : __clobber_all);
92 }
93
94 SEC("socket")
95 __description("map element value with unaligned load")
96 __success __failure_unpriv __msg_unpriv("R0 leaks addr")
97 __retval(0) __flag(BPF_F_ANY_ALIGNMENT)
98 __naked void element_value_with_unaligned_load(void)
99 {
100 asm volatile (" \
101 r2 = r10; \
102 r2 += -8; \
103 r1 = 0; \
104 *(u64*)(r2 + 0) = r1; \
105 r1 = %[map_hash_48b] ll; \
106 call %[bpf_map_lookup_elem]; \
107 if r0 == 0 goto l0_%=; \
108 r1 = *(u32*)(r0 + 0); \
109 if r1 >= %[max_entries] goto l0_%=; \
110 r0 += 3; \
111 r7 = *(u64*)(r0 + 0); \
112 r7 = *(u64*)(r0 + 2); \
113 r8 = r0; \
114 r7 = *(u64*)(r8 + 0); \
115 r7 = *(u64*)(r8 + 2); \
116 r0 += 5; \
117 r7 = *(u64*)(r0 + 0); \
118 r7 = *(u64*)(r0 + 4); \
119 l0_%=: exit; \
120 " :
121 : __imm(bpf_map_lookup_elem),
122 __imm_addr(map_hash_48b),
123 __imm_const(max_entries, MAX_ENTRIES)
124 : __clobber_all);
125 }
126
127 SEC("socket")
128 __description("map element value is preserved across register spilling")
129 __success __failure_unpriv __msg_unpriv("R0 leaks addr")
130 __retval(0) __flag(BPF_F_ANY_ALIGNMENT)
131 __naked void is_preserved_across_register_spilling(void)
132 {
133 asm volatile (" \
134 r2 = r10; \
135 r2 += -8; \
136 r1 = 0; \
137 *(u64*)(r2 + 0) = r1; \
138 r1 = %[map_hash_48b] ll; \
139 call %[bpf_map_lookup_elem]; \
140 if r0 == 0 goto l0_%=; \
141 r0 += %[test_val_foo]; \
142 r1 = 42; \
143 *(u64*)(r0 + 0) = r1; \
144 r1 = r10; \
145 r1 += -184; \
146 *(u64*)(r1 + 0) = r0; \
147 r3 = *(u64*)(r1 + 0); \
148 r1 = 42; \
149 *(u64*)(r3 + 0) = r1; \
150 l0_%=: exit; \
151 " :
152 : __imm(bpf_map_lookup_elem),
153 __imm_addr(map_hash_48b),
154 __imm_const(test_val_foo, offsetof(struct test_val, foo))
155 : __clobber_all);
156 }
157
158 char _license[] SEC("license") = "GPL";
159
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