[PATCHv5 bpf-next 21/28] selftests/bpf: Add uprobe_multi link test

Jiri Olsa
2023-07-30T13:45:59Z

Adding uprobe_multi test for bpf_link_create attach function.

Testing attachment using the struct bpf_link_create_opts.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
---
.../bpf/prog_tests/uprobe_multi_test.c | 68 +++++++++++++++++++
1 file changed, 68 insertions(+)

diff --git a/tools/testing/selftests/bpf/prog_tests/uprobe_multi_test.c b/tools/testing/selftests/bpf/prog_tests/uprobe_multi_test.c
index 2ac8954123e4..e460fd4d370d 100644
--- a/tools/testing/selftests/bpf/prog_tests/uprobe_multi_test.c
+++ b/tools/testing/selftests/bpf/prog_tests/uprobe_multi_test.c
@@ -3,6 +3,7 @@
#include <unistd.h>
#include <test_progs.h>
#include "uprobe_multi.skel.h"
+#include "bpf/libbpf_internal.h"

static char test_data[] = "test_data";

@@ -130,6 +131,71 @@ static void test_attach_api_syms(void)
test_attach_api("/proc/self/exe", NULL, &opts);
}

+static void test_link_api(void)
+{
+ int prog_fd, link1_fd = -1, link2_fd = -1, link3_fd = -1, link4_fd = -1;
+ LIBBPF_OPTS(bpf_link_create_opts, opts);
+ const char *path = "/proc/self/exe";
+ struct uprobe_multi *skel = NULL;
+ unsigned long *offsets = NULL;
+ const char *syms[3] = {
+ "uprobe_multi_func_1",
+ "uprobe_multi_func_2",
+ "uprobe_multi_func_3",
+ };
+ int err;
+
+ err = elf_resolve_syms_offsets(path, 3, syms, (unsigned long **) &offsets);
+ if (!ASSERT_OK(err, "elf_resolve_syms_offsets"))
+ return;
+
+ opts.uprobe_multi.path = path;
+ opts.uprobe_multi.offsets = offsets;
+ opts.uprobe_multi.cnt = ARRAY_SIZE(syms);
+
+ skel = uprobe_multi__open_and_load();
+ if (!ASSERT_OK_PTR(skel, "uprobe_multi__open_and_load"))
+ goto cleanup;
+
+ opts.kprobe_multi.flags = 0;
+ prog_fd = bpf_program__fd(skel->progs.uprobe);
+ link1_fd = bpf_link_create(prog_fd, 0, BPF_TRACE_UPROBE_MULTI, &opts);
+ if (!ASSERT_GE(link1_fd, 0, "link1_fd"))
+ goto cleanup;
+
+ opts.kprobe_multi.flags = BPF_F_UPROBE_MULTI_RETURN;
+ prog_fd = bpf_program__fd(skel->progs.uretprobe);
+ link2_fd = bpf_link_create(prog_fd, 0, BPF_TRACE_UPROBE_MULTI, &opts);
+ if (!ASSERT_GE(link2_fd, 0, "link2_fd"))
+ goto cleanup;
+
+ opts.kprobe_multi.flags = 0;
+ prog_fd = bpf_program__fd(skel->progs.uprobe_sleep);
+ link3_fd = bpf_link_create(prog_fd, 0, BPF_TRACE_UPROBE_MULTI, &opts);
+ if (!ASSERT_GE(link3_fd, 0, "link3_fd"))
+ goto cleanup;
+
+ opts.kprobe_multi.flags = BPF_F_UPROBE_MULTI_RETURN;
+ prog_fd = bpf_program__fd(skel->progs.uretprobe_sleep);
+ link4_fd = bpf_link_create(prog_fd, 0, BPF_TRACE_UPROBE_MULTI, &opts);
+ if (!ASSERT_GE(link4_fd, 0, "link4_fd"))
+ goto cleanup;
+ uprobe_multi_test_run(skel);
+
+cleanup:
+ if (link1_fd >= 0)
+ close(link1_fd);
+ if (link2_fd >= 0)
+ close(link2_fd);
+ if (link3_fd >= 0)
+ close(link3_fd);
+ if (link4_fd >= 0)
+ close(link4_fd);
+
+ uprobe_multi__destroy(skel);
+ free(offsets);
+}
+
void test_uprobe_multi_test(void)
{
if (test__start_subtest("skel_api"))
@@ -138,4 +204,6 @@ void test_uprobe_multi_test(void)
test_attach_api_pattern();
if (test__start_subtest("attach_api_syms"))
test_attach_api_syms();
+ if (test__start_subtest("link_api"))
+ test_link_api();
}
--
2.41.0