1// SPDX-License-Identifier: GPL-2.0
2/* Converted from tools/testing/selftests/bpf/verifier/map_ret_val.c */
3
4#include <linux/bpf.h>
5#include <bpf/bpf_helpers.h>
6#include "../../../include/linux/filter.h"
7#include "bpf_misc.h"
8
9struct {
10	__uint(type, BPF_MAP_TYPE_HASH);
11	__uint(max_entries, 1);
12	__type(key, long long);
13	__type(value, long long);
14} map_hash_8b SEC(".maps");
15
16SEC("socket")
17__description("invalid map_fd for function call")
18__failure __msg("fd 0 is not pointing to valid bpf_map")
19__failure_unpriv
20__naked void map_fd_for_function_call(void)
21{
22	asm volatile ("					\
23	r2 = 0;						\
24	*(u64*)(r10 - 8) = r2;				\
25	r2 = r10;					\
26	r2 += -8;					\
27	.8byte %[ld_map_fd];				\
28	.8byte 0;					\
29	call %[bpf_map_delete_elem];			\
30	exit;						\
31"	:
32	: __imm(bpf_map_delete_elem),
33	  __imm_insn(ld_map_fd, BPF_RAW_INSN(BPF_LD | BPF_DW | BPF_IMM, BPF_REG_1, BPF_PSEUDO_MAP_FD, 0, 0))
34	: __clobber_all);
35}
36
37SEC("socket")
38__description("don't check return value before access")
39__failure __msg("R0 invalid mem access 'map_value_or_null'")
40__failure_unpriv
41__naked void check_return_value_before_access(void)
42{
43	asm volatile ("					\
44	r1 = 0;						\
45	*(u64*)(r10 - 8) = r1;				\
46	r2 = r10;					\
47	r2 += -8;					\
48	r1 = %[map_hash_8b] ll;				\
49	call %[bpf_map_lookup_elem];			\
50	r1 = 0;						\
51	*(u64*)(r0 + 0) = r1;				\
52	exit;						\
53"	:
54	: __imm(bpf_map_lookup_elem),
55	  __imm_addr(map_hash_8b)
56	: __clobber_all);
57}
58
59SEC("socket")
60__description("access memory with incorrect alignment")
61__failure __msg("misaligned value access")
62__failure_unpriv
63__flag(BPF_F_STRICT_ALIGNMENT)
64__naked void access_memory_with_incorrect_alignment_1(void)
65{
66	asm volatile ("					\
67	r1 = 0;						\
68	*(u64*)(r10 - 8) = r1;				\
69	r2 = r10;					\
70	r2 += -8;					\
71	r1 = %[map_hash_8b] ll;				\
72	call %[bpf_map_lookup_elem];			\
73	if r0 == 0 goto l0_%=;				\
74	r1 = 0;						\
75	*(u64*)(r0 + 4) = r1;				\
76l0_%=:	exit;						\
77"	:
78	: __imm(bpf_map_lookup_elem),
79	  __imm_addr(map_hash_8b)
80	: __clobber_all);
81}
82
83SEC("socket")
84__description("sometimes access memory with incorrect alignment")
85__failure __msg("R0 invalid mem access")
86__msg_unpriv("R0 leaks addr")
87__flag(BPF_F_STRICT_ALIGNMENT)
88__naked void access_memory_with_incorrect_alignment_2(void)
89{
90	asm volatile ("					\
91	r1 = 0;						\
92	*(u64*)(r10 - 8) = r1;				\
93	r2 = r10;					\
94	r2 += -8;					\
95	r1 = %[map_hash_8b] ll;				\
96	call %[bpf_map_lookup_elem];			\
97	if r0 == 0 goto l0_%=;				\
98	r1 = 0;						\
99	*(u64*)(r0 + 0) = r1;				\
100	exit;						\
101l0_%=:	r1 = 1;						\
102	*(u64*)(r0 + 0) = r1;				\
103	exit;						\
104"	:
105	: __imm(bpf_map_lookup_elem),
106	  __imm_addr(map_hash_8b)
107	: __clobber_all);
108}
109
110char _license[] SEC("license") = "GPL";
111