Commit a93d22ea authored by Jiri Olsa's avatar Jiri Olsa Committed by Alexei Starovoitov
Browse files

selftests/bpf: Add uprobe_multi link test 



Adding uprobe_multi test for bpf_link_create attach function.

Testing attachment using the struct bpf_link_create_opts.

Signed-off-by: default avatarJiri Olsa <jolsa@kernel.org>
Link: https://lore.kernel.org/r/20230809083440.3209381-22-jolsa@kernel.org


Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
parent ffc68903

tools/testing/selftests/bpf/prog_tests/uprobe_multi_test.c

+69 −0
Original line number Diff line number Diff line
@@ -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 +131,72 @@ 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 +205,6 @@ 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();

}