1 // SPDX-License-Identifier: GPL-2.0
2 /* Converted from tools/testing/selftests/bpf/verifier/map_in_map.c */
3
4 #include <linux/bpf.h>
5 #include <bpf/bpf_helpers.h>
6 #include "bpf_misc.h"
7
8 struct {
9 __uint(type, BPF_MAP_TYPE_ARRAY_OF_MAPS);
10 __uint(max_entries, 1);
11 __type(key, int);
12 __type(value, int);
13 __array(values, struct {
14 __uint(type, BPF_MAP_TYPE_ARRAY);
15 __uint(max_entries, 1);
16 __type(key, int);
17 __type(value, int);
18 });
19 } map_in_map SEC(".maps");
20
21 SEC("socket")
22 __description("map in map access")
23 __success __success_unpriv __retval(0)
24 __naked void map_in_map_access(void)
25 {
26 asm volatile (" \
27 r1 = 0; \
28 *(u32*)(r10 - 4) = r1; \
29 r2 = r10; \
30 r2 += -4; \
31 r1 = %[map_in_map] ll; \
32 call %[bpf_map_lookup_elem]; \
33 if r0 == 0 goto l0_%=; \
34 r1 = 0; \
35 *(u32*)(r10 - 4) = r1; \
36 r2 = r10; \
37 r2 += -4; \
38 r1 = r0; \
39 call %[bpf_map_lookup_elem]; \
40 l0_%=: r0 = 0; \
41 exit; \
42 " :
43 : __imm(bpf_map_lookup_elem),
44 __imm_addr(map_in_map)
45 : __clobber_all);
46 }
47
48 SEC("xdp")
49 __description("map in map state pruning")
50 __success __msg("processed 26 insns")
51 __log_level(2) __retval(0) __flag(BPF_F_TEST_STATE_FREQ)
52 __naked void map_in_map_state_pruning(void)
53 {
54 asm volatile (" \
55 r1 = 0; \
56 *(u32*)(r10 - 4) = r1; \
57 r6 = r10; \
58 r6 += -4; \
59 r2 = r6; \
60 r1 = %[map_in_map] ll; \
61 call %[bpf_map_lookup_elem]; \
62 if r0 != 0 goto l0_%=; \
63 exit; \
64 l0_%=: r2 = r6; \
65 r1 = r0; \
66 call %[bpf_map_lookup_elem]; \
67 if r0 != 0 goto l1_%=; \
68 r2 = r6; \
69 r1 = %[map_in_map] ll; \
70 call %[bpf_map_lookup_elem]; \
71 if r0 != 0 goto l2_%=; \
72 exit; \
73 l2_%=: r2 = r6; \
74 r1 = r0; \
75 call %[bpf_map_lookup_elem]; \
76 if r0 != 0 goto l1_%=; \
77 exit; \
78 l1_%=: r0 = *(u32*)(r0 + 0); \
79 exit; \
80 " :
81 : __imm(bpf_map_lookup_elem),
82 __imm_addr(map_in_map)
83 : __clobber_all);
84 }
85
86 SEC("socket")
87 __description("invalid inner map pointer")
88 __failure __msg("R1 pointer arithmetic on map_ptr prohibited")
89 __failure_unpriv
90 __naked void invalid_inner_map_pointer(void)
91 {
92 asm volatile (" \
93 r1 = 0; \
94 *(u32*)(r10 - 4) = r1; \
95 r2 = r10; \
96 r2 += -4; \
97 r1 = %[map_in_map] ll; \
98 call %[bpf_map_lookup_elem]; \
99 if r0 == 0 goto l0_%=; \
100 r1 = 0; \
101 *(u32*)(r10 - 4) = r1; \
102 r2 = r10; \
103 r2 += -4; \
104 r1 = r0; \
105 r1 += 8; \
106 call %[bpf_map_lookup_elem]; \
107 l0_%=: r0 = 0; \
108 exit; \
109 " :
110 : __imm(bpf_map_lookup_elem),
111 __imm_addr(map_in_map)
112 : __clobber_all);
113 }
114
115 SEC("socket")
116 __description("forgot null checking on the inner map pointer")
117 __failure __msg("R1 type=map_value_or_null expected=map_ptr")
118 __failure_unpriv
119 __naked void on_the_inner_map_pointer(void)
120 {
121 asm volatile (" \
122 r1 = 0; \
123 *(u32*)(r10 - 4) = r1; \
124 r2 = r10; \
125 r2 += -4; \
126 r1 = %[map_in_map] ll; \
127 call %[bpf_map_lookup_elem]; \
128 r1 = 0; \
129 *(u32*)(r10 - 4) = r1; \
130 r2 = r10; \
131 r2 += -4; \
132 r1 = r0; \
133 call %[bpf_map_lookup_elem]; \
134 r0 = 0; \
135 exit; \
136 " :
137 : __imm(bpf_map_lookup_elem),
138 __imm_addr(map_in_map)
139 : __clobber_all);
140 }
141
142 char _license[] SEC("license") = "GPL";
143
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