1
2#include <test_progs.h>
3#include <network_helpers.h>
4
5#include "map_kptr.skel.h"
6#include "map_kptr_fail.skel.h"
7
8static char log_buf[1024 * 1024];
9
10struct {
11 const char *prog_name;
12 const char *err_msg;
13} map_kptr_fail_tests[] = {
14 { "size_not_bpf_dw", "kptr access size must be BPF_DW" },
15 { "non_const_var_off", "kptr access cannot have variable offset" },
16 { "non_const_var_off_kptr_xchg", "R1 doesn't have constant offset. kptr has to be" },
17 { "misaligned_access_write", "kptr access misaligned expected=8 off=7" },
18 { "misaligned_access_read", "kptr access misaligned expected=8 off=1" },
19 { "reject_var_off_store", "variable untrusted_ptr_ access var_off=(0x0; 0x1e0)" },
20 { "reject_bad_type_match", "invalid kptr access, R1 type=untrusted_ptr_prog_test_ref_kfunc" },
21 { "marked_as_untrusted_or_null", "R1 type=untrusted_ptr_or_null_ expected=percpu_ptr_" },
22 { "correct_btf_id_check_size", "access beyond struct prog_test_ref_kfunc at off 32 size 4" },
23 { "inherit_untrusted_on_walk", "R1 type=untrusted_ptr_ expected=percpu_ptr_" },
24 { "reject_kptr_xchg_on_unref", "off=8 kptr isn't referenced kptr" },
25 { "reject_kptr_get_no_map_val", "arg#0 expected pointer to map value" },
26 { "reject_kptr_get_no_null_map_val", "arg#0 expected pointer to map value" },
27 { "reject_kptr_get_no_kptr", "arg#0 no referenced kptr at map value offset=0" },
28 { "reject_kptr_get_on_unref", "arg#0 no referenced kptr at map value offset=8" },
29 { "reject_kptr_get_bad_type_match", "kernel function bpf_kfunc_call_test_kptr_get args#0" },
30 { "mark_ref_as_untrusted_or_null", "R1 type=untrusted_ptr_or_null_ expected=percpu_ptr_" },
31 { "reject_untrusted_store_to_ref", "store to referenced kptr disallowed" },
32 { "reject_bad_type_xchg", "invalid kptr access, R2 type=ptr_prog_test_ref_kfunc expected=ptr_prog_test_member" },
33 { "reject_untrusted_xchg", "R2 type=untrusted_ptr_ expected=ptr_" },
34 { "reject_member_of_ref_xchg", "invalid kptr access, R2 type=ptr_prog_test_ref_kfunc" },
35 { "reject_indirect_helper_access", "kptr cannot be accessed indirectly by helper" },
36 { "reject_indirect_global_func_access", "kptr cannot be accessed indirectly by helper" },
37 { "kptr_xchg_ref_state", "Unreleased reference id=5 alloc_insn=" },
38 { "kptr_get_ref_state", "Unreleased reference id=3 alloc_insn=" },
39};
40
41static void test_map_kptr_fail_prog(const char *prog_name, const char *err_msg)
42{
43 LIBBPF_OPTS(bpf_object_open_opts, opts, .kernel_log_buf = log_buf,
44 .kernel_log_size = sizeof(log_buf),
45 .kernel_log_level = 1);
46 struct map_kptr_fail *skel;
47 struct bpf_program *prog;
48 int ret;
49
50 skel = map_kptr_fail__open_opts(&opts);
51 if (!ASSERT_OK_PTR(skel, "map_kptr_fail__open_opts"))
52 return;
53
54 prog = bpf_object__find_program_by_name(skel->obj, prog_name);
55 if (!ASSERT_OK_PTR(prog, "bpf_object__find_program_by_name"))
56 goto end;
57
58 bpf_program__set_autoload(prog, true);
59
60 ret = map_kptr_fail__load(skel);
61 if (!ASSERT_ERR(ret, "map_kptr__load must fail"))
62 goto end;
63
64 if (!ASSERT_OK_PTR(strstr(log_buf, err_msg), "expected error message")) {
65 fprintf(stderr, "Expected: %s\n", err_msg);
66 fprintf(stderr, "Verifier: %s\n", log_buf);
67 }
68
69end:
70 map_kptr_fail__destroy(skel);
71}
72
73static void test_map_kptr_fail(void)
74{
75 int i;
76
77 for (i = 0; i < ARRAY_SIZE(map_kptr_fail_tests); i++) {
78 if (!test__start_subtest(map_kptr_fail_tests[i].prog_name))
79 continue;
80 test_map_kptr_fail_prog(map_kptr_fail_tests[i].prog_name,
81 map_kptr_fail_tests[i].err_msg);
82 }
83}
84
85static void test_map_kptr_success(bool test_run)
86{
87 LIBBPF_OPTS(bpf_test_run_opts, opts,
88 .data_in = &pkt_v4,
89 .data_size_in = sizeof(pkt_v4),
90 .repeat = 1,
91 );
92 struct map_kptr *skel;
93 int key = 0, ret;
94 char buf[16];
95
96 skel = map_kptr__open_and_load();
97 if (!ASSERT_OK_PTR(skel, "map_kptr__open_and_load"))
98 return;
99
100 ret = bpf_prog_test_run_opts(bpf_program__fd(skel->progs.test_map_kptr_ref), &opts);
101 ASSERT_OK(ret, "test_map_kptr_ref refcount");
102 ASSERT_OK(opts.retval, "test_map_kptr_ref retval");
103 ret = bpf_prog_test_run_opts(bpf_program__fd(skel->progs.test_map_kptr_ref2), &opts);
104 ASSERT_OK(ret, "test_map_kptr_ref2 refcount");
105 ASSERT_OK(opts.retval, "test_map_kptr_ref2 retval");
106
107 if (test_run)
108 return;
109
110 ret = bpf_map__update_elem(skel->maps.array_map,
111 &key, sizeof(key), buf, sizeof(buf), 0);
112 ASSERT_OK(ret, "array_map update");
113 ret = bpf_map__update_elem(skel->maps.array_map,
114 &key, sizeof(key), buf, sizeof(buf), 0);
115 ASSERT_OK(ret, "array_map update2");
116
117 ret = bpf_map__update_elem(skel->maps.hash_map,
118 &key, sizeof(key), buf, sizeof(buf), 0);
119 ASSERT_OK(ret, "hash_map update");
120 ret = bpf_map__delete_elem(skel->maps.hash_map, &key, sizeof(key), 0);
121 ASSERT_OK(ret, "hash_map delete");
122
123 ret = bpf_map__update_elem(skel->maps.hash_malloc_map,
124 &key, sizeof(key), buf, sizeof(buf), 0);
125 ASSERT_OK(ret, "hash_malloc_map update");
126 ret = bpf_map__delete_elem(skel->maps.hash_malloc_map, &key, sizeof(key), 0);
127 ASSERT_OK(ret, "hash_malloc_map delete");
128
129 ret = bpf_map__update_elem(skel->maps.lru_hash_map,
130 &key, sizeof(key), buf, sizeof(buf), 0);
131 ASSERT_OK(ret, "lru_hash_map update");
132 ret = bpf_map__delete_elem(skel->maps.lru_hash_map, &key, sizeof(key), 0);
133 ASSERT_OK(ret, "lru_hash_map delete");
134
135 map_kptr__destroy(skel);
136}
137
138void test_map_kptr(void)
139{
140 if (test__start_subtest("success")) {
141 test_map_kptr_success(false);
142
143
144
145 test_map_kptr_success(true);
146 }
147 test_map_kptr_fail();
148}
149
