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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 | // SPDX-License-Identifier: GPL-2.0 /* Copyright (c) 2022 Meta Platforms, Inc. and affiliates. */ #include <test_progs.h> #include <bpf/btf.h> #include "test_log_fixup.skel.h" enum trunc_type { TRUNC_NONE, TRUNC_PARTIAL, TRUNC_FULL, }; static void bad_core_relo(size_t log_buf_size, enum trunc_type trunc_type) { char log_buf[8 * 1024]; struct test_log_fixup* skel; int err; skel = test_log_fixup__open(); if (!ASSERT_OK_PTR(skel, "skel_open")) return; bpf_program__set_autoload(skel->progs.bad_relo, true); memset(log_buf, 0, sizeof(log_buf)); bpf_program__set_log_buf(skel->progs.bad_relo, log_buf, log_buf_size ?: sizeof(log_buf)); bpf_program__set_log_level(skel->progs.bad_relo, 1 | 8); /* BPF_LOG_FIXED to force truncation */ err = test_log_fixup__load(skel); if (!ASSERT_ERR(err, "load_fail")) goto cleanup; ASSERT_HAS_SUBSTR(log_buf, "0: <invalid CO-RE relocation>\n" "failed to resolve CO-RE relocation <byte_sz> ", "log_buf_part1"); switch (trunc_type) { case TRUNC_NONE: ASSERT_HAS_SUBSTR(log_buf, "struct task_struct___bad.fake_field (0:1 @ offset 4)\n", "log_buf_part2"); ASSERT_HAS_SUBSTR(log_buf, "max_states_per_insn 0 total_states 0 peak_states 0 mark_read 0\n", "log_buf_end"); break; case TRUNC_PARTIAL: /* we should get full libbpf message patch */ ASSERT_HAS_SUBSTR(log_buf, "struct task_struct___bad.fake_field (0:1 @ offset 4)\n", "log_buf_part2"); /* we shouldn't get full end of BPF verifier log */ ASSERT_NULL(strstr(log_buf, "max_states_per_insn 0 total_states 0 peak_states 0 mark_read 0\n"), "log_buf_end"); break; case TRUNC_FULL: /* we shouldn't get second part of libbpf message patch */ ASSERT_NULL(strstr(log_buf, "struct task_struct___bad.fake_field (0:1 @ offset 4)\n"), "log_buf_part2"); /* we shouldn't get full end of BPF verifier log */ ASSERT_NULL(strstr(log_buf, "max_states_per_insn 0 total_states 0 peak_states 0 mark_read 0\n"), "log_buf_end"); break; } if (env.verbosity > VERBOSE_NONE) printf("LOG: \n=================\n%s=================\n", log_buf); cleanup: test_log_fixup__destroy(skel); } static void bad_core_relo_subprog(void) { char log_buf[8 * 1024]; struct test_log_fixup* skel; int err; skel = test_log_fixup__open(); if (!ASSERT_OK_PTR(skel, "skel_open")) return; bpf_program__set_autoload(skel->progs.bad_relo_subprog, true); bpf_program__set_log_buf(skel->progs.bad_relo_subprog, log_buf, sizeof(log_buf)); err = test_log_fixup__load(skel); if (!ASSERT_ERR(err, "load_fail")) goto cleanup; ASSERT_HAS_SUBSTR(log_buf, ": <invalid CO-RE relocation>\n" "failed to resolve CO-RE relocation <byte_off> ", "log_buf"); ASSERT_HAS_SUBSTR(log_buf, "struct task_struct___bad.fake_field_subprog (0:2 @ offset 8)\n", "log_buf"); if (env.verbosity > VERBOSE_NONE) printf("LOG: \n=================\n%s=================\n", log_buf); cleanup: test_log_fixup__destroy(skel); } static void missing_map(void) { char log_buf[8 * 1024]; struct test_log_fixup* skel; int err; skel = test_log_fixup__open(); if (!ASSERT_OK_PTR(skel, "skel_open")) return; bpf_map__set_autocreate(skel->maps.missing_map, false); bpf_program__set_autoload(skel->progs.use_missing_map, true); bpf_program__set_log_buf(skel->progs.use_missing_map, log_buf, sizeof(log_buf)); err = test_log_fixup__load(skel); if (!ASSERT_ERR(err, "load_fail")) goto cleanup; ASSERT_TRUE(bpf_map__autocreate(skel->maps.existing_map), "existing_map_autocreate"); ASSERT_FALSE(bpf_map__autocreate(skel->maps.missing_map), "missing_map_autocreate"); ASSERT_HAS_SUBSTR(log_buf, ": <invalid BPF map reference>\n" "BPF map 'missing_map' is referenced but wasn't created\n", "log_buf"); if (env.verbosity > VERBOSE_NONE) printf("LOG: \n=================\n%s=================\n", log_buf); cleanup: test_log_fixup__destroy(skel); } static void missing_kfunc(void) { char log_buf[8 * 1024]; struct test_log_fixup* skel; int err; skel = test_log_fixup__open(); if (!ASSERT_OK_PTR(skel, "skel_open")) return; bpf_program__set_autoload(skel->progs.use_missing_kfunc, true); bpf_program__set_log_buf(skel->progs.use_missing_kfunc, log_buf, sizeof(log_buf)); err = test_log_fixup__load(skel); if (!ASSERT_ERR(err, "load_fail")) goto cleanup; ASSERT_HAS_SUBSTR(log_buf, "0: <invalid kfunc call>\n" "kfunc 'bpf_nonexistent_kfunc' is referenced but wasn't resolved\n", "log_buf"); if (env.verbosity > VERBOSE_NONE) printf("LOG: \n=================\n%s=================\n", log_buf); cleanup: test_log_fixup__destroy(skel); } void test_log_fixup(void) { if (test__start_subtest("bad_core_relo_trunc_none")) bad_core_relo(0, TRUNC_NONE /* full buf */); if (test__start_subtest("bad_core_relo_trunc_partial")) bad_core_relo(300, TRUNC_PARTIAL /* truncate original log a bit */); if (test__start_subtest("bad_core_relo_trunc_full")) bad_core_relo(240, TRUNC_FULL /* truncate also libbpf's message patch */); if (test__start_subtest("bad_core_relo_subprog")) bad_core_relo_subprog(); if (test__start_subtest("missing_map")) missing_map(); if (test__start_subtest("missing_kfunc")) missing_kfunc(); } |