Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1// SPDX-License-Identifier: GPL-2.0
2#include <test_progs.h>
3
4void test_probe_user(void)
5{
6 static const char *const prog_names[] = {
7 "handle_sys_connect",
8#if defined(__s390x__)
9 "handle_sys_socketcall",
10#endif
11 };
12 enum { prog_count = ARRAY_SIZE(prog_names) };
13 const char *obj_file = "./test_probe_user.bpf.o";
14 DECLARE_LIBBPF_OPTS(bpf_object_open_opts, opts, );
15 int err, results_map_fd, sock_fd, duration = 0;
16 struct sockaddr curr, orig, tmp;
17 struct sockaddr_in *in = (struct sockaddr_in *)&curr;
18 struct bpf_link *kprobe_links[prog_count] = {};
19 struct bpf_program *kprobe_progs[prog_count];
20 struct bpf_object *obj;
21 static const int zero = 0;
22 struct test_pro_bss {
23 struct sockaddr_in old;
24 __u32 test_pid;
25 };
26 struct test_pro_bss results = {};
27 size_t i;
28
29 obj = bpf_object__open_file(obj_file, &opts);
30 if (!ASSERT_OK_PTR(obj, "obj_open_file"))
31 return;
32
33 for (i = 0; i < prog_count; i++) {
34 kprobe_progs[i] =
35 bpf_object__find_program_by_name(obj, prog_names[i]);
36 if (CHECK(!kprobe_progs[i], "find_probe",
37 "prog '%s' not found\n", prog_names[i]))
38 goto cleanup;
39 }
40
41 {
42 struct bpf_map *bss_map;
43 struct test_pro_bss bss_init = {};
44
45 bss_init.test_pid = getpid();
46 bss_map = bpf_object__find_map_by_name(obj, "test_pro.bss");
47 if (!ASSERT_OK_PTR(bss_map, "find_bss_map"))
48 goto cleanup;
49 if (!ASSERT_EQ(bpf_map__value_size(bss_map), sizeof(bss_init),
50 "bss_size"))
51 goto cleanup;
52 err = bpf_map__set_initial_value(bss_map, &bss_init,
53 sizeof(bss_init));
54 if (!ASSERT_OK(err, "set_bss_init"))
55 goto cleanup;
56 }
57
58 err = bpf_object__load(obj);
59 if (CHECK(err, "obj_load", "err %d\n", err))
60 goto cleanup;
61
62 results_map_fd = bpf_find_map(__func__, obj, "test_pro.bss");
63 if (CHECK(results_map_fd < 0, "find_bss_map",
64 "err %d\n", results_map_fd))
65 goto cleanup;
66
67 for (i = 0; i < prog_count; i++) {
68 kprobe_links[i] = bpf_program__attach(kprobe_progs[i]);
69 if (!ASSERT_OK_PTR(kprobe_links[i], "attach_kprobe"))
70 goto cleanup;
71 }
72
73 memset(&curr, 0, sizeof(curr));
74 in->sin_family = AF_INET;
75 in->sin_port = htons(5555);
76 in->sin_addr.s_addr = inet_addr("255.255.255.255");
77 memcpy(&orig, &curr, sizeof(curr));
78
79 sock_fd = socket(AF_INET, SOCK_STREAM, 0);
80 if (CHECK(sock_fd < 0, "create_sock_fd", "err %d\n", sock_fd))
81 goto cleanup;
82
83 connect(sock_fd, &curr, sizeof(curr));
84 close(sock_fd);
85
86 err = bpf_map_lookup_elem(results_map_fd, &zero, &results);
87 if (CHECK(err, "get_kprobe_res",
88 "failed to get kprobe res: %d\n", err))
89 goto cleanup;
90
91 memcpy(&tmp, &results.old, sizeof(tmp));
92
93 in = (struct sockaddr_in *)&tmp;
94 if (CHECK(memcmp(&tmp, &orig, sizeof(orig)), "check_kprobe_res",
95 "wrong kprobe res from probe read: %s:%u\n",
96 inet_ntoa(in->sin_addr), ntohs(in->sin_port)))
97 goto cleanup;
98
99 memset(&tmp, 0xab, sizeof(tmp));
100
101 in = (struct sockaddr_in *)&curr;
102 if (CHECK(memcmp(&curr, &tmp, sizeof(tmp)), "check_kprobe_res",
103 "wrong kprobe res from probe write: %s:%u\n",
104 inet_ntoa(in->sin_addr), ntohs(in->sin_port)))
105 goto cleanup;
106cleanup:
107 for (i = 0; i < prog_count; i++)
108 bpf_link__destroy(kprobe_links[i]);
109 bpf_object__close(obj);
110}