1 // SPDX-License-Identifier: GPL-2.0
2
3 /* Test cases that can't load programs using libbpf and need direct
4 * BPF syscall access
5 */
6
7 #include <sys/syscall.h>
8 #include <bpf/libbpf.h>
9 #include <bpf/btf.h>
10
11 #include "test_progs.h"
12 #include "test_btf.h"
13 #include "bpf/libbpf_internal.h"
14
15 static char log[16 * 1024];
16
17 /* Check that verifier rejects BPF program containing relocation
18 * pointing to non-existent BTF type.
19 */
test_bad_local_id(void)20 static void test_bad_local_id(void)
21 {
22 struct test_btf {
23 struct btf_header hdr;
24 __u32 types[15];
25 char strings[128];
26 } raw_btf = {
27 .hdr = {
28 .magic = BTF_MAGIC,
29 .version = BTF_VERSION,
30 .hdr_len = sizeof(struct btf_header),
31 .type_off = 0,
32 .type_len = sizeof(raw_btf.types),
33 .str_off = offsetof(struct test_btf, strings) -
34 offsetof(struct test_btf, types),
35 .str_len = sizeof(raw_btf.strings),
36 },
37 .types = {
38 BTF_PTR_ENC(0), /* [1] void* */
39 BTF_TYPE_INT_ENC(1, BTF_INT_SIGNED, 0, 32, 4), /* [2] int */
40 BTF_FUNC_PROTO_ENC(2, 1), /* [3] int (*)(void*) */
41 BTF_FUNC_PROTO_ARG_ENC(8, 1),
42 BTF_FUNC_ENC(8, 3) /* [4] FUNC 'foo' type_id=2 */
43 },
44 .strings = "\0int\0 0\0foo\0"
45 };
46 __u32 log_level = 1 | 2 | 4;
47 LIBBPF_OPTS(bpf_btf_load_opts, opts,
48 .log_buf = log,
49 .log_size = sizeof(log),
50 .log_level = log_level,
51 );
52 struct bpf_insn insns[] = {
53 BPF_ALU64_IMM(BPF_MOV, BPF_REG_0, 0),
54 BPF_EXIT_INSN(),
55 };
56 struct bpf_func_info funcs[] = {
57 {
58 .insn_off = 0,
59 .type_id = 4,
60 }
61 };
62 struct bpf_core_relo relos[] = {
63 {
64 .insn_off = 0, /* patch first instruction (r0 = 0) */
65 .type_id = 100500, /* !!! this type id does not exist */
66 .access_str_off = 6, /* offset of "0" */
67 .kind = BPF_CORE_TYPE_ID_LOCAL,
68 }
69 };
70 union bpf_attr attr;
71 int saved_errno;
72 int prog_fd = -1;
73 int btf_fd = -1;
74
75 btf_fd = bpf_btf_load(&raw_btf, sizeof(raw_btf), &opts);
76 saved_errno = errno;
77 if (btf_fd < 0 || env.verbosity > VERBOSE_NORMAL) {
78 printf("-------- BTF load log start --------\n");
79 printf("%s", log);
80 printf("-------- BTF load log end ----------\n");
81 }
82 if (btf_fd < 0) {
83 PRINT_FAIL("bpf_btf_load() failed, errno=%d\n", saved_errno);
84 return;
85 }
86
87 log[0] = 0;
88 memset(&attr, 0, sizeof(attr));
89 attr.prog_btf_fd = btf_fd;
90 attr.prog_type = BPF_TRACE_RAW_TP;
91 attr.license = (__u64)"GPL";
92 attr.insns = (__u64)&insns;
93 attr.insn_cnt = sizeof(insns) / sizeof(*insns);
94 attr.log_buf = (__u64)log;
95 attr.log_size = sizeof(log);
96 attr.log_level = log_level;
97 attr.func_info = (__u64)funcs;
98 attr.func_info_cnt = sizeof(funcs) / sizeof(*funcs);
99 attr.func_info_rec_size = sizeof(*funcs);
100 attr.core_relos = (__u64)relos;
101 attr.core_relo_cnt = sizeof(relos) / sizeof(*relos);
102 attr.core_relo_rec_size = sizeof(*relos);
103 prog_fd = sys_bpf_prog_load(&attr, sizeof(attr), 1);
104 saved_errno = errno;
105 if (prog_fd < 0 || env.verbosity > VERBOSE_NORMAL) {
106 printf("-------- program load log start --------\n");
107 printf("%s", log);
108 printf("-------- program load log end ----------\n");
109 }
110 if (prog_fd >= 0) {
111 PRINT_FAIL("sys_bpf_prog_load() expected to fail\n");
112 goto out;
113 }
114 ASSERT_HAS_SUBSTR(log, "relo #0: bad type id 100500", "program load log");
115
116 out:
117 close(prog_fd);
118 close(btf_fd);
119 }
120
test_core_reloc_raw(void)121 void test_core_reloc_raw(void)
122 {
123 if (test__start_subtest("bad_local_id"))
124 test_bad_local_id();
125 }
126