1 // SPDX-License-Identifier: GPL-2.0
2 #include <test_progs.h>
3 #include "test_attach_kprobe_sleepable.skel.h"
4 #include "test_attach_probe_manual.skel.h"
5 #include "test_attach_probe.skel.h"
7 /* this is how USDT semaphore is actually defined, except volatile modifier */
8 volatile unsigned short uprobe_ref_ctr __attribute__((unused)) __attribute((section(".probes")));
10 /* uprobe attach point */
11 static noinline void trigger_func(void)
16 /* attach point for byname uprobe */
17 static noinline void trigger_func2(void)
22 /* attach point for byname sleepable uprobe */
23 static noinline void trigger_func3(void)
28 /* attach point for ref_ctr */
29 static noinline void trigger_func4(void)
34 static char test_data[] = "test_data";
36 /* manual attach kprobe/kretprobe/uprobe/uretprobe testings */
37 static void test_attach_probe_manual(enum probe_attach_mode attach_mode)
39 DECLARE_LIBBPF_OPTS(bpf_uprobe_opts, uprobe_opts);
40 DECLARE_LIBBPF_OPTS(bpf_kprobe_opts, kprobe_opts);
41 struct bpf_link *kprobe_link, *kretprobe_link;
42 struct bpf_link *uprobe_link, *uretprobe_link;
43 struct test_attach_probe_manual *skel;
44 ssize_t uprobe_offset;
46 skel = test_attach_probe_manual__open_and_load();
47 if (!ASSERT_OK_PTR(skel, "skel_kprobe_manual_open_and_load"))
50 uprobe_offset = get_uprobe_offset(&trigger_func);
51 if (!ASSERT_GE(uprobe_offset, 0, "uprobe_offset"))
54 /* manual-attach kprobe/kretprobe */
55 kprobe_opts.attach_mode = attach_mode;
56 kprobe_opts.retprobe = false;
57 kprobe_link = bpf_program__attach_kprobe_opts(skel->progs.handle_kprobe,
58 SYS_NANOSLEEP_KPROBE_NAME,
60 if (!ASSERT_OK_PTR(kprobe_link, "attach_kprobe"))
62 skel->links.handle_kprobe = kprobe_link;
64 kprobe_opts.retprobe = true;
65 kretprobe_link = bpf_program__attach_kprobe_opts(skel->progs.handle_kretprobe,
66 SYS_NANOSLEEP_KPROBE_NAME,
68 if (!ASSERT_OK_PTR(kretprobe_link, "attach_kretprobe"))
70 skel->links.handle_kretprobe = kretprobe_link;
72 /* manual-attach uprobe/uretprobe */
73 uprobe_opts.attach_mode = attach_mode;
74 uprobe_opts.ref_ctr_offset = 0;
75 uprobe_opts.retprobe = false;
76 uprobe_link = bpf_program__attach_uprobe_opts(skel->progs.handle_uprobe,
81 if (!ASSERT_OK_PTR(uprobe_link, "attach_uprobe"))
83 skel->links.handle_uprobe = uprobe_link;
85 uprobe_opts.retprobe = true;
86 uretprobe_link = bpf_program__attach_uprobe_opts(skel->progs.handle_uretprobe,
89 uprobe_offset, &uprobe_opts);
90 if (!ASSERT_OK_PTR(uretprobe_link, "attach_uretprobe"))
92 skel->links.handle_uretprobe = uretprobe_link;
94 /* attach uprobe by function name manually */
95 uprobe_opts.func_name = "trigger_func2";
96 uprobe_opts.retprobe = false;
97 uprobe_opts.ref_ctr_offset = 0;
98 skel->links.handle_uprobe_byname =
99 bpf_program__attach_uprobe_opts(skel->progs.handle_uprobe_byname,
103 if (!ASSERT_OK_PTR(skel->links.handle_uprobe_byname, "attach_uprobe_byname"))
106 /* trigger & validate kprobe && kretprobe */
109 /* trigger & validate uprobe & uretprobe */
112 /* trigger & validate uprobe attached by name */
115 ASSERT_EQ(skel->bss->kprobe_res, 1, "check_kprobe_res");
116 ASSERT_EQ(skel->bss->kretprobe_res, 2, "check_kretprobe_res");
117 ASSERT_EQ(skel->bss->uprobe_res, 3, "check_uprobe_res");
118 ASSERT_EQ(skel->bss->uretprobe_res, 4, "check_uretprobe_res");
119 ASSERT_EQ(skel->bss->uprobe_byname_res, 5, "check_uprobe_byname_res");
122 test_attach_probe_manual__destroy(skel);
125 static void test_attach_probe_auto(struct test_attach_probe *skel)
127 struct bpf_link *uprobe_err_link;
129 /* auto-attachable kprobe and kretprobe */
130 skel->links.handle_kprobe_auto = bpf_program__attach(skel->progs.handle_kprobe_auto);
131 ASSERT_OK_PTR(skel->links.handle_kprobe_auto, "attach_kprobe_auto");
133 skel->links.handle_kretprobe_auto = bpf_program__attach(skel->progs.handle_kretprobe_auto);
134 ASSERT_OK_PTR(skel->links.handle_kretprobe_auto, "attach_kretprobe_auto");
136 /* verify auto-attach fails for old-style uprobe definition */
137 uprobe_err_link = bpf_program__attach(skel->progs.handle_uprobe_byname);
138 if (!ASSERT_EQ(libbpf_get_error(uprobe_err_link), -EOPNOTSUPP,
139 "auto-attach should fail for old-style name"))
142 /* verify auto-attach works */
143 skel->links.handle_uretprobe_byname =
144 bpf_program__attach(skel->progs.handle_uretprobe_byname);
145 if (!ASSERT_OK_PTR(skel->links.handle_uretprobe_byname, "attach_uretprobe_byname"))
148 /* trigger & validate kprobe && kretprobe */
151 /* trigger & validate uprobe attached by name */
154 ASSERT_EQ(skel->bss->kprobe2_res, 11, "check_kprobe_auto_res");
155 ASSERT_EQ(skel->bss->kretprobe2_res, 22, "check_kretprobe_auto_res");
156 ASSERT_EQ(skel->bss->uretprobe_byname_res, 6, "check_uretprobe_byname_res");
159 static void test_uprobe_lib(struct test_attach_probe *skel)
161 DECLARE_LIBBPF_OPTS(bpf_uprobe_opts, uprobe_opts);
164 /* test attach by name for a library function, using the library
165 * as the binary argument. libc.so.6 will be resolved via dlopen()/dlinfo().
167 uprobe_opts.func_name = "fopen";
168 uprobe_opts.retprobe = false;
169 skel->links.handle_uprobe_byname2 =
170 bpf_program__attach_uprobe_opts(skel->progs.handle_uprobe_byname2,
174 if (!ASSERT_OK_PTR(skel->links.handle_uprobe_byname2, "attach_uprobe_byname2"))
177 uprobe_opts.func_name = "fclose";
178 uprobe_opts.retprobe = true;
179 skel->links.handle_uretprobe_byname2 =
180 bpf_program__attach_uprobe_opts(skel->progs.handle_uretprobe_byname2,
184 if (!ASSERT_OK_PTR(skel->links.handle_uretprobe_byname2, "attach_uretprobe_byname2"))
187 /* trigger & validate shared library u[ret]probes attached by name */
188 devnull = fopen("/dev/null", "r");
191 ASSERT_EQ(skel->bss->uprobe_byname2_res, 7, "check_uprobe_byname2_res");
192 ASSERT_EQ(skel->bss->uretprobe_byname2_res, 8, "check_uretprobe_byname2_res");
195 static void test_uprobe_ref_ctr(struct test_attach_probe *skel)
197 DECLARE_LIBBPF_OPTS(bpf_uprobe_opts, uprobe_opts);
198 struct bpf_link *uprobe_link, *uretprobe_link;
199 ssize_t uprobe_offset, ref_ctr_offset;
201 uprobe_offset = get_uprobe_offset(&trigger_func4);
202 if (!ASSERT_GE(uprobe_offset, 0, "uprobe_offset_ref_ctr"))
205 ref_ctr_offset = get_rel_offset((uintptr_t)&uprobe_ref_ctr);
206 if (!ASSERT_GE(ref_ctr_offset, 0, "ref_ctr_offset"))
209 ASSERT_EQ(uprobe_ref_ctr, 0, "uprobe_ref_ctr_before");
211 uprobe_opts.retprobe = false;
212 uprobe_opts.ref_ctr_offset = ref_ctr_offset;
213 uprobe_link = bpf_program__attach_uprobe_opts(skel->progs.handle_uprobe_ref_ctr,
218 if (!ASSERT_OK_PTR(uprobe_link, "attach_uprobe_ref_ctr"))
220 skel->links.handle_uprobe_ref_ctr = uprobe_link;
222 ASSERT_GT(uprobe_ref_ctr, 0, "uprobe_ref_ctr_after");
224 /* if uprobe uses ref_ctr, uretprobe has to use ref_ctr as well */
225 uprobe_opts.retprobe = true;
226 uprobe_opts.ref_ctr_offset = ref_ctr_offset;
227 uretprobe_link = bpf_program__attach_uprobe_opts(skel->progs.handle_uretprobe_ref_ctr,
230 uprobe_offset, &uprobe_opts);
231 if (!ASSERT_OK_PTR(uretprobe_link, "attach_uretprobe_ref_ctr"))
233 skel->links.handle_uretprobe_ref_ctr = uretprobe_link;
236 static void test_kprobe_sleepable(void)
238 struct test_attach_kprobe_sleepable *skel;
240 skel = test_attach_kprobe_sleepable__open();
241 if (!ASSERT_OK_PTR(skel, "skel_kprobe_sleepable_open"))
244 /* sleepable kprobe test case needs flags set before loading */
245 if (!ASSERT_OK(bpf_program__set_flags(skel->progs.handle_kprobe_sleepable,
246 BPF_F_SLEEPABLE), "kprobe_sleepable_flags"))
249 if (!ASSERT_OK(test_attach_kprobe_sleepable__load(skel),
250 "skel_kprobe_sleepable_load"))
253 /* sleepable kprobes should not attach successfully */
254 skel->links.handle_kprobe_sleepable = bpf_program__attach(skel->progs.handle_kprobe_sleepable);
255 ASSERT_ERR_PTR(skel->links.handle_kprobe_sleepable, "attach_kprobe_sleepable");
258 test_attach_kprobe_sleepable__destroy(skel);
261 static void test_uprobe_sleepable(struct test_attach_probe *skel)
263 /* test sleepable uprobe and uretprobe variants */
264 skel->links.handle_uprobe_byname3_sleepable = bpf_program__attach(skel->progs.handle_uprobe_byname3_sleepable);
265 if (!ASSERT_OK_PTR(skel->links.handle_uprobe_byname3_sleepable, "attach_uprobe_byname3_sleepable"))
268 skel->links.handle_uprobe_byname3 = bpf_program__attach(skel->progs.handle_uprobe_byname3);
269 if (!ASSERT_OK_PTR(skel->links.handle_uprobe_byname3, "attach_uprobe_byname3"))
272 skel->links.handle_uretprobe_byname3_sleepable = bpf_program__attach(skel->progs.handle_uretprobe_byname3_sleepable);
273 if (!ASSERT_OK_PTR(skel->links.handle_uretprobe_byname3_sleepable, "attach_uretprobe_byname3_sleepable"))
276 skel->links.handle_uretprobe_byname3 = bpf_program__attach(skel->progs.handle_uretprobe_byname3);
277 if (!ASSERT_OK_PTR(skel->links.handle_uretprobe_byname3, "attach_uretprobe_byname3"))
280 skel->bss->user_ptr = test_data;
282 /* trigger & validate sleepable uprobe attached by name */
285 ASSERT_EQ(skel->bss->uprobe_byname3_sleepable_res, 9, "check_uprobe_byname3_sleepable_res");
286 ASSERT_EQ(skel->bss->uprobe_byname3_str_sleepable_res, 10, "check_uprobe_byname3_str_sleepable_res");
287 ASSERT_EQ(skel->bss->uprobe_byname3_res, 11, "check_uprobe_byname3_res");
288 ASSERT_EQ(skel->bss->uretprobe_byname3_sleepable_res, 12, "check_uretprobe_byname3_sleepable_res");
289 ASSERT_EQ(skel->bss->uretprobe_byname3_str_sleepable_res, 13, "check_uretprobe_byname3_str_sleepable_res");
290 ASSERT_EQ(skel->bss->uretprobe_byname3_res, 14, "check_uretprobe_byname3_res");
293 void test_attach_probe(void)
295 struct test_attach_probe *skel;
297 skel = test_attach_probe__open();
298 if (!ASSERT_OK_PTR(skel, "skel_open"))
301 if (!ASSERT_OK(test_attach_probe__load(skel), "skel_load"))
303 if (!ASSERT_OK_PTR(skel->bss, "check_bss"))
306 if (test__start_subtest("manual-default"))
307 test_attach_probe_manual(PROBE_ATTACH_MODE_DEFAULT);
308 if (test__start_subtest("manual-legacy"))
309 test_attach_probe_manual(PROBE_ATTACH_MODE_LEGACY);
310 if (test__start_subtest("manual-perf"))
311 test_attach_probe_manual(PROBE_ATTACH_MODE_PERF);
312 if (test__start_subtest("manual-link"))
313 test_attach_probe_manual(PROBE_ATTACH_MODE_LINK);
315 if (test__start_subtest("auto"))
316 test_attach_probe_auto(skel);
317 if (test__start_subtest("kprobe-sleepable"))
318 test_kprobe_sleepable();
319 if (test__start_subtest("uprobe-lib"))
320 test_uprobe_lib(skel);
321 if (test__start_subtest("uprobe-sleepable"))
322 test_uprobe_sleepable(skel);
323 if (test__start_subtest("uprobe-ref_ctr"))
324 test_uprobe_ref_ctr(skel);
327 test_attach_probe__destroy(skel);
328 ASSERT_EQ(uprobe_ref_ctr, 0, "uprobe_ref_ctr_cleanup");