Commit e7cf9a48 authored by Jiri Olsa's avatar Jiri Olsa Committed by Alexei Starovoitov
Browse files

selftests/bpf: Add uprobe_multi cookie test 



Adding test for cookies setup/retrieval in uprobe_link uprobes
and making sure bpf_get_attach_cookie works properly.

Signed-off-by: default avatarJiri Olsa <jolsa@kernel.org>
Link: https://lore.kernel.org/r/20230809083440.3209381-27-jolsa@kernel.org


Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
parent 85209e83

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

+78 −0
Original line number Diff line number Diff line
@@ -11,6 +11,7 @@ 
#include <bpf/btf.h>

#include "test_bpf_cookie.skel.h"

#include "kprobe_multi.skel.h"

#include "uprobe_multi.skel.h"



/* uprobe attach point */

static noinline void trigger_func(void)
@@ -239,6 +240,81 @@ static void kprobe_multi_attach_api_subtest(void) 
	bpf_link__destroy(link1);

	kprobe_multi__destroy(skel);

}



/* defined in prog_tests/uprobe_multi_test.c */

void uprobe_multi_func_1(void);

void uprobe_multi_func_2(void);

void uprobe_multi_func_3(void);



static void uprobe_multi_test_run(struct uprobe_multi *skel)

{

	skel->bss->uprobe_multi_func_1_addr = (__u64) uprobe_multi_func_1;

	skel->bss->uprobe_multi_func_2_addr = (__u64) uprobe_multi_func_2;

	skel->bss->uprobe_multi_func_3_addr = (__u64) uprobe_multi_func_3;



	skel->bss->pid = getpid();

	skel->bss->test_cookie = true;



	uprobe_multi_func_1();

	uprobe_multi_func_2();

	uprobe_multi_func_3();



	ASSERT_EQ(skel->bss->uprobe_multi_func_1_result, 1, "uprobe_multi_func_1_result");

	ASSERT_EQ(skel->bss->uprobe_multi_func_2_result, 1, "uprobe_multi_func_2_result");

	ASSERT_EQ(skel->bss->uprobe_multi_func_3_result, 1, "uprobe_multi_func_3_result");



	ASSERT_EQ(skel->bss->uretprobe_multi_func_1_result, 1, "uretprobe_multi_func_1_result");

	ASSERT_EQ(skel->bss->uretprobe_multi_func_2_result, 1, "uretprobe_multi_func_2_result");

	ASSERT_EQ(skel->bss->uretprobe_multi_func_3_result, 1, "uretprobe_multi_func_3_result");

}



static void uprobe_multi_attach_api_subtest(void)

{

	struct bpf_link *link1 = NULL, *link2 = NULL;

	struct uprobe_multi *skel = NULL;

	LIBBPF_OPTS(bpf_uprobe_multi_opts, opts);

	const char *syms[3] = {

		"uprobe_multi_func_1",

		"uprobe_multi_func_2",

		"uprobe_multi_func_3",

	};

	__u64 cookies[3];



	cookies[0] = 3; /* uprobe_multi_func_1 */

	cookies[1] = 1; /* uprobe_multi_func_2 */

	cookies[2] = 2; /* uprobe_multi_func_3 */



	opts.syms = syms;

	opts.cnt = ARRAY_SIZE(syms);

	opts.cookies = &cookies[0];



	skel = uprobe_multi__open_and_load();

	if (!ASSERT_OK_PTR(skel, "uprobe_multi"))

		goto cleanup;



	link1 = bpf_program__attach_uprobe_multi(skel->progs.uprobe, -1,

						 "/proc/self/exe", NULL, &opts);

	if (!ASSERT_OK_PTR(link1, "bpf_program__attach_uprobe_multi"))

		goto cleanup;



	cookies[0] = 2; /* uprobe_multi_func_1 */

	cookies[1] = 3; /* uprobe_multi_func_2 */

	cookies[2] = 1; /* uprobe_multi_func_3 */



	opts.retprobe = true;

	link2 = bpf_program__attach_uprobe_multi(skel->progs.uretprobe, -1,

						      "/proc/self/exe", NULL, &opts);

	if (!ASSERT_OK_PTR(link2, "bpf_program__attach_uprobe_multi_retprobe"))

		goto cleanup;



	uprobe_multi_test_run(skel);



cleanup:

	bpf_link__destroy(link2);

	bpf_link__destroy(link1);

	uprobe_multi__destroy(skel);

}



static void uprobe_subtest(struct test_bpf_cookie *skel)

{

	DECLARE_LIBBPF_OPTS(bpf_uprobe_opts, opts);
@@ -515,6 +591,8 @@ void test_bpf_cookie(void) 
		kprobe_multi_attach_api_subtest();

	if (test__start_subtest("uprobe"))

		uprobe_subtest(skel);

	if (test__start_subtest("multi_uprobe_attach_api"))

		uprobe_multi_attach_api_subtest();

	if (test__start_subtest("tracepoint"))

		tp_subtest(skel);

	if (test__start_subtest("perf_event"))