1 // SPDX-License-Identifier: GPL-2.0 2 /* Copyright (c) 2024 Meta Platforms, Inc. and affiliates. */ 3 #include <test_progs.h> 4 #include "tracing_failure.skel.h" 5 6 static void test_bpf_spin_lock(bool is_spin_lock) 7 { 8 struct tracing_failure *skel; 9 int err; 10 11 skel = tracing_failure__open(); 12 if (!ASSERT_OK_PTR(skel, "tracing_failure__open")) 13 return; 14 15 if (is_spin_lock) 16 bpf_program__set_autoload(skel->progs.test_spin_lock, true); 17 else 18 bpf_program__set_autoload(skel->progs.test_spin_unlock, true); 19 20 err = tracing_failure__load(skel); 21 if (!ASSERT_OK(err, "tracing_failure__load")) 22 goto out; 23 24 err = tracing_failure__attach(skel); 25 ASSERT_ERR(err, "tracing_failure__attach"); 26 27 out: 28 tracing_failure__destroy(skel); 29 } 30 31 static void test_tracing_fail_prog(const char *prog_name, const char *exp_msg) 32 { 33 struct tracing_failure *skel; 34 struct bpf_program *prog; 35 char log_buf[256]; 36 int err; 37 38 skel = tracing_failure__open(); 39 if (!ASSERT_OK_PTR(skel, "tracing_failure__open")) 40 return; 41 42 prog = bpf_object__find_program_by_name(skel->obj, prog_name); 43 if (!ASSERT_OK_PTR(prog, "bpf_object__find_program_by_name")) 44 goto out; 45 46 bpf_program__set_autoload(prog, true); 47 bpf_program__set_log_buf(prog, log_buf, sizeof(log_buf)); 48 49 err = tracing_failure__load(skel); 50 if (!ASSERT_ERR(err, "tracing_failure__load")) 51 goto out; 52 53 ASSERT_HAS_SUBSTR(log_buf, exp_msg, "log_buf"); 54 out: 55 tracing_failure__destroy(skel); 56 } 57 58 static void test_tracing_deny(void) 59 { 60 int btf_id; 61 62 /* __rcu_read_lock depends on CONFIG_PREEMPT_RCU */ 63 btf_id = libbpf_find_vmlinux_btf_id("__rcu_read_lock", BPF_TRACE_FENTRY); 64 if (btf_id <= 0) { 65 test__skip(); 66 return; 67 } 68 69 test_tracing_fail_prog("tracing_deny", 70 "Attaching tracing programs to function '__rcu_read_lock' is rejected."); 71 } 72 73 static void test_fexit_noreturns(void) 74 { 75 test_tracing_fail_prog("fexit_noreturns", 76 "Attaching fexit/fmod_ret to __noreturn function 'do_exit' is rejected."); 77 } 78 79 void test_tracing_failure(void) 80 { 81 if (test__start_subtest("bpf_spin_lock")) 82 test_bpf_spin_lock(true); 83 if (test__start_subtest("bpf_spin_unlock")) 84 test_bpf_spin_lock(false); 85 if (test__start_subtest("tracing_deny")) 86 test_tracing_deny(); 87 if (test__start_subtest("fexit_noreturns")) 88 test_fexit_noreturns(); 89 } 90