1// SPDX-License-Identifier: GPL-2.0
2/* Converted from tools/testing/selftests/bpf/verifier/map_ptr_mixing.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
10struct test_val {
11	unsigned int index;
12	int foo[MAX_ENTRIES];
13};
14
15struct {
16	__uint(type, BPF_MAP_TYPE_ARRAY);
17	__uint(max_entries, 1);
18	__type(key, int);
19	__type(value, struct test_val);
20} map_array_48b SEC(".maps");
21
22struct {
23	__uint(type, BPF_MAP_TYPE_HASH);
24	__uint(max_entries, 1);
25	__type(key, long long);
26	__type(value, struct test_val);
27} map_hash_48b SEC(".maps");
28
29struct {
30	__uint(type, BPF_MAP_TYPE_ARRAY_OF_MAPS);
31	__uint(max_entries, 1);
32	__type(key, int);
33	__type(value, int);
34	__array(values, struct {
35		__uint(type, BPF_MAP_TYPE_ARRAY);
36		__uint(max_entries, 1);
37		__type(key, int);
38		__type(value, int);
39	});
40} map_in_map SEC(".maps");
41
42void dummy_prog_42_socket(void);
43void dummy_prog_24_socket(void);
44void dummy_prog_loop1_socket(void);
45void dummy_prog_loop2_socket(void);
46
47struct {
48	__uint(type, BPF_MAP_TYPE_PROG_ARRAY);
49	__uint(max_entries, 4);
50	__uint(key_size, sizeof(int));
51	__array(values, void (void));
52} map_prog1_socket SEC(".maps") = {
53	.values = {
54		[0] = (void *)&dummy_prog_42_socket,
55		[1] = (void *)&dummy_prog_loop1_socket,
56		[2] = (void *)&dummy_prog_24_socket,
57	},
58};
59
60struct {
61	__uint(type, BPF_MAP_TYPE_PROG_ARRAY);
62	__uint(max_entries, 8);
63	__uint(key_size, sizeof(int));
64	__array(values, void (void));
65} map_prog2_socket SEC(".maps") = {
66	.values = {
67		[1] = (void *)&dummy_prog_loop2_socket,
68		[2] = (void *)&dummy_prog_24_socket,
69		[7] = (void *)&dummy_prog_42_socket,
70	},
71};
72
73SEC("socket")
74__auxiliary __auxiliary_unpriv
75__naked void dummy_prog_42_socket(void)
76{
77	asm volatile ("r0 = 42; exit;");
78}
79
80SEC("socket")
81__auxiliary __auxiliary_unpriv
82__naked void dummy_prog_24_socket(void)
83{
84	asm volatile ("r0 = 24; exit;");
85}
86
87SEC("socket")
88__auxiliary __auxiliary_unpriv
89__naked void dummy_prog_loop1_socket(void)
90{
91	asm volatile ("			\
92	r3 = 1;				\
93	r2 = %[map_prog1_socket] ll;	\
94	call %[bpf_tail_call];		\
95	r0 = 41;			\
96	exit;				\
97"	:
98	: __imm(bpf_tail_call),
99	  __imm_addr(map_prog1_socket)
100	: __clobber_all);
101}
102
103SEC("socket")
104__auxiliary __auxiliary_unpriv
105__naked void dummy_prog_loop2_socket(void)
106{
107	asm volatile ("			\
108	r3 = 1;				\
109	r2 = %[map_prog2_socket] ll;	\
110	call %[bpf_tail_call];		\
111	r0 = 41;			\
112	exit;				\
113"	:
114	: __imm(bpf_tail_call),
115	  __imm_addr(map_prog2_socket)
116	: __clobber_all);
117}
118
119SEC("tc")
120__description("calls: two calls returning different map pointers for lookup (hash, array)")
121__success __retval(1)
122__naked void pointers_for_lookup_hash_array(void)
123{
124	asm volatile ("					\
125	/* main prog */					\
126	if r1 != 0 goto l0_%=;				\
127	call pointers_for_lookup_hash_array__1;		\
128	goto l1_%=;					\
129l0_%=:	call pointers_for_lookup_hash_array__2;		\
130l1_%=:	r1 = r0;					\
131	r2 = 0;						\
132	*(u64*)(r10 - 8) = r2;				\
133	r2 = r10;					\
134	r2 += -8;					\
135	call %[bpf_map_lookup_elem];			\
136	if r0 == 0 goto l2_%=;				\
137	r1 = %[test_val_foo];				\
138	*(u64*)(r0 + 0) = r1;				\
139	r0 = 1;						\
140l2_%=:	exit;						\
141"	:
142	: __imm(bpf_map_lookup_elem),
143	  __imm_const(test_val_foo, offsetof(struct test_val, foo))
144	: __clobber_all);
145}
146
147static __naked __noinline __attribute__((used))
148void pointers_for_lookup_hash_array__1(void)
149{
150	asm volatile ("					\
151	r0 = %[map_hash_48b] ll;			\
152	exit;						\
153"	:
154	: __imm_addr(map_hash_48b)
155	: __clobber_all);
156}
157
158static __naked __noinline __attribute__((used))
159void pointers_for_lookup_hash_array__2(void)
160{
161	asm volatile ("					\
162	r0 = %[map_array_48b] ll;			\
163	exit;						\
164"	:
165	: __imm_addr(map_array_48b)
166	: __clobber_all);
167}
168
169SEC("tc")
170__description("calls: two calls returning different map pointers for lookup (hash, map in map)")
171__failure __msg("only read from bpf_array is supported")
172__naked void lookup_hash_map_in_map(void)
173{
174	asm volatile ("					\
175	/* main prog */					\
176	if r1 != 0 goto l0_%=;				\
177	call lookup_hash_map_in_map__1;			\
178	goto l1_%=;					\
179l0_%=:	call lookup_hash_map_in_map__2;			\
180l1_%=:	r1 = r0;					\
181	r2 = 0;						\
182	*(u64*)(r10 - 8) = r2;				\
183	r2 = r10;					\
184	r2 += -8;					\
185	call %[bpf_map_lookup_elem];			\
186	if r0 == 0 goto l2_%=;				\
187	r1 = %[test_val_foo];				\
188	*(u64*)(r0 + 0) = r1;				\
189	r0 = 1;						\
190l2_%=:	exit;						\
191"	:
192	: __imm(bpf_map_lookup_elem),
193	  __imm_const(test_val_foo, offsetof(struct test_val, foo))
194	: __clobber_all);
195}
196
197static __naked __noinline __attribute__((used))
198void lookup_hash_map_in_map__1(void)
199{
200	asm volatile ("					\
201	r0 = %[map_array_48b] ll;			\
202	exit;						\
203"	:
204	: __imm_addr(map_array_48b)
205	: __clobber_all);
206}
207
208static __naked __noinline __attribute__((used))
209void lookup_hash_map_in_map__2(void)
210{
211	asm volatile ("					\
212	r0 = %[map_in_map] ll;				\
213	exit;						\
214"	:
215	: __imm_addr(map_in_map)
216	: __clobber_all);
217}
218
219SEC("socket")
220__description("cond: two branches returning different map pointers for lookup (tail, tail)")
221__success __failure_unpriv __msg_unpriv("tail_call abusing map_ptr")
222__retval(42)
223__naked void pointers_for_lookup_tail_tail_1(void)
224{
225	asm volatile ("					\
226	r6 = *(u32*)(r1 + %[__sk_buff_mark]);		\
227	if r6 != 0 goto l0_%=;				\
228	r2 = %[map_prog2_socket] ll;			\
229	goto l1_%=;					\
230l0_%=:	r2 = %[map_prog1_socket] ll;			\
231l1_%=:	r3 = 7;						\
232	call %[bpf_tail_call];				\
233	r0 = 1;						\
234	exit;						\
235"	:
236	: __imm(bpf_tail_call),
237	  __imm_addr(map_prog1_socket),
238	  __imm_addr(map_prog2_socket),
239	  __imm_const(__sk_buff_mark, offsetof(struct __sk_buff, mark))
240	: __clobber_all);
241}
242
243SEC("socket")
244__description("cond: two branches returning same map pointers for lookup (tail, tail)")
245__success __success_unpriv __retval(42)
246__naked void pointers_for_lookup_tail_tail_2(void)
247{
248	asm volatile ("					\
249	r6 = *(u32*)(r1 + %[__sk_buff_mark]);		\
250	if r6 == 0 goto l0_%=;				\
251	r2 = %[map_prog2_socket] ll;			\
252	goto l1_%=;					\
253l0_%=:	r2 = %[map_prog2_socket] ll;			\
254l1_%=:	r3 = 7;						\
255	call %[bpf_tail_call];				\
256	r0 = 1;						\
257	exit;						\
258"	:
259	: __imm(bpf_tail_call),
260	  __imm_addr(map_prog2_socket),
261	  __imm_const(__sk_buff_mark, offsetof(struct __sk_buff, mark))
262	: __clobber_all);
263}
264
265char _license[] SEC("license") = "GPL";
266