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
8struct {
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
21SEC("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];			\
40l0_%=:	r0 = 0;						\
41	exit;						\
42"	:
43	: __imm(bpf_map_lookup_elem),
44	  __imm_addr(map_in_map)
45	: __clobber_all);
46}
47
48SEC("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;						\
64l0_%=:	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;						\
73l2_%=:	r2 = r6;					\
74	r1 = r0;					\
75	call %[bpf_map_lookup_elem];			\
76	if r0 != 0 goto l1_%=;				\
77	exit;						\
78l1_%=:	r0 = *(u32*)(r0 + 0);				\
79	exit;						\
80"	:
81	: __imm(bpf_map_lookup_elem),
82	  __imm_addr(map_in_map)
83	: __clobber_all);
84}
85
86SEC("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];			\
107l0_%=:	r0 = 0;						\
108	exit;						\
109"	:
110	: __imm(bpf_map_lookup_elem),
111	  __imm_addr(map_in_map)
112	: __clobber_all);
113}
114
115SEC("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
142char _license[] SEC("license") = "GPL";
143