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
get_stack_print_output(void * ctx,int cpu,void * data,__u32 size)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
test_get_stack_raw_tp(void)85 void test_get_stack_raw_tp(void)
86 {
87 const char *file = "./test_get_stack_rawtp.bpf.o";
88 const char *file_err = "./test_get_stack_rawtp_err.bpf.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
