1 // SPDX-License-Identifier: GPL-2.0 2 #define _GNU_SOURCE 3 #include <pthread.h> 4 #include <sched.h> 5 #include <sys/socket.h> 6 #include <test_progs.h> 7 8 #define MAX_CNT_RAWTP 10ull 9 #define MAX_STACK_RAWTP 100 10 11 static int duration = 0; 12 13 struct get_stack_trace_t { 14 int pid; 15 int kern_stack_size; 16 int user_stack_size; 17 int user_stack_buildid_size; 18 __u64 kern_stack[MAX_STACK_RAWTP]; 19 __u64 user_stack[MAX_STACK_RAWTP]; 20 struct bpf_stack_build_id user_stack_buildid[MAX_STACK_RAWTP]; 21 }; 22 23 static void get_stack_print_output(void *ctx, int cpu, void *data, __u32 size) 24 { 25 bool good_kern_stack = false, good_user_stack = false; 26 const char *nonjit_func = "___bpf_prog_run"; 27 /* perfbuf-submitted data is 4-byte aligned, but we need 8-byte 28 * alignment, so copy data into a local variable, for simplicity 29 */ 30 struct get_stack_trace_t e; 31 int i, num_stack; 32 struct ksym *ks; 33 34 memset(&e, 0, sizeof(e)); 35 memcpy(&e, data, size <= sizeof(e) ? size : sizeof(e)); 36 37 if (size < sizeof(struct get_stack_trace_t)) { 38 __u64 *raw_data = data; 39 bool found = false; 40 41 num_stack = size / sizeof(__u64); 42 /* If jit is enabled, we do not have a good way to 43 * verify the sanity of the kernel stack. So we 44 * just assume it is good if the stack is not empty. 45 * This could be improved in the future. 46 */ 47 if (env.jit_enabled) { 48 found = num_stack > 0; 49 } else { 50 for (i = 0; i < num_stack; i++) { 51 ks = ksym_search(raw_data[i]); 52 if (ks && (strcmp(ks->name, nonjit_func) == 0)) { 53 found = true; 54 break; 55 } 56 } 57 } 58 if (found) { 59 good_kern_stack = true; 60 good_user_stack = true; 61 } 62 } else { 63 num_stack = e.kern_stack_size / sizeof(__u64); 64 if (env.jit_enabled) { 65 good_kern_stack = num_stack > 0; 66 } else { 67 for (i = 0; i < num_stack; i++) { 68 ks = ksym_search(e.kern_stack[i]); 69 if (ks && (strcmp(ks->name, nonjit_func) == 0)) { 70 good_kern_stack = true; 71 break; 72 } 73 } 74 } 75 if (e.user_stack_size > 0 && e.user_stack_buildid_size > 0) 76 good_user_stack = true; 77 } 78 79 if (!good_kern_stack) 80 CHECK(!good_kern_stack, "kern_stack", "corrupted kernel stack\n"); 81 if (!good_user_stack) 82 CHECK(!good_user_stack, "user_stack", "corrupted user stack\n"); 83 } 84 85 void test_get_stack_raw_tp(void) 86 { 87 const char *file = "./test_get_stack_rawtp.o"; 88 const char *file_err = "./test_get_stack_rawtp_err.o"; 89 const char *prog_name = "bpf_prog1"; 90 int i, err, prog_fd, exp_cnt = MAX_CNT_RAWTP; 91 struct perf_buffer *pb = NULL; 92 struct bpf_link *link = NULL; 93 struct timespec tv = {0, 10}; 94 struct bpf_program *prog; 95 struct bpf_object *obj; 96 struct bpf_map *map; 97 cpu_set_t cpu_set; 98 99 err = bpf_prog_test_load(file_err, BPF_PROG_TYPE_RAW_TRACEPOINT, &obj, &prog_fd); 100 if (CHECK(err >= 0, "prog_load raw tp", "err %d errno %d\n", err, errno)) 101 return; 102 103 err = bpf_prog_test_load(file, BPF_PROG_TYPE_RAW_TRACEPOINT, &obj, &prog_fd); 104 if (CHECK(err, "prog_load raw tp", "err %d errno %d\n", err, errno)) 105 return; 106 107 prog = bpf_object__find_program_by_name(obj, prog_name); 108 if (CHECK(!prog, "find_probe", "prog '%s' not found\n", prog_name)) 109 goto close_prog; 110 111 map = bpf_object__find_map_by_name(obj, "perfmap"); 112 if (CHECK(!map, "bpf_find_map", "not found\n")) 113 goto close_prog; 114 115 err = load_kallsyms(); 116 if (CHECK(err < 0, "load_kallsyms", "err %d errno %d\n", err, errno)) 117 goto close_prog; 118 119 CPU_ZERO(&cpu_set); 120 CPU_SET(0, &cpu_set); 121 err = pthread_setaffinity_np(pthread_self(), sizeof(cpu_set), &cpu_set); 122 if (CHECK(err, "set_affinity", "err %d, errno %d\n", err, errno)) 123 goto close_prog; 124 125 link = bpf_program__attach_raw_tracepoint(prog, "sys_enter"); 126 if (!ASSERT_OK_PTR(link, "attach_raw_tp")) 127 goto close_prog; 128 129 pb = perf_buffer__new(bpf_map__fd(map), 8, get_stack_print_output, 130 NULL, NULL, NULL); 131 if (!ASSERT_OK_PTR(pb, "perf_buf__new")) 132 goto close_prog; 133 134 /* trigger some syscall action */ 135 for (i = 0; i < MAX_CNT_RAWTP; i++) 136 nanosleep(&tv, NULL); 137 138 while (exp_cnt > 0) { 139 err = perf_buffer__poll(pb, 100); 140 if (err < 0 && CHECK(err < 0, "pb__poll", "err %d\n", err)) 141 goto close_prog; 142 exp_cnt -= err; 143 } 144 145 close_prog: 146 bpf_link__destroy(link); 147 perf_buffer__free(pb); 148 bpf_object__close(obj); 149 } 150