Commit c7aec81b authored by Menglong Dong's avatar Menglong Dong Committed by Andrii Nakryiko
Browse files

selftests/bpf: Add test for legacy/perf kprobe/uprobe attach mode 



Add the testing for kprobe/uprobe attaching in default, legacy, perf and
link mode. And the testing passed:

./test_progs -t attach_probe
$5/1     attach_probe/manual-default:OK
$5/2     attach_probe/manual-legacy:OK
$5/3     attach_probe/manual-perf:OK
$5/4     attach_probe/manual-link:OK
$5/5     attach_probe/auto:OK
$5/6     attach_probe/kprobe-sleepable:OK
$5/7     attach_probe/uprobe-lib:OK
$5/8     attach_probe/uprobe-sleepable:OK
$5/9     attach_probe/uprobe-ref_ctr:OK
$5       attach_probe:OK
Summary: 1/9 PASSED, 0 SKIPPED, 0 FAILED

Signed-off-by: default avatarMenglong Dong <imagedong@tencent.com>
Signed-off-by: default avatarAndrii Nakryiko <andrii@kernel.org>
Reviewed-by: default avatarBiao Jiang <benbjiang@tencent.com>
Link: https://lore.kernel.org/bpf/20230306064833.7932-4-imagedong@tencent.com
parent 7391ec63

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

+28 −9
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0

#include <test_progs.h>

#include "test_attach_kprobe_sleepable.skel.h"

#include "test_attach_probe_manual.skel.h"

#include "test_attach_probe.skel.h"



/* this is how USDT semaphore is actually defined, except volatile modifier */
@@ -33,33 +34,43 @@ static noinline void trigger_func4(void) 
static char test_data[] = "test_data";



/* manual attach kprobe/kretprobe/uprobe/uretprobe testings */

static void test_attach_probe_manual(struct test_attach_probe *skel)

static void test_attach_probe_manual(enum probe_attach_mode attach_mode)

{

	DECLARE_LIBBPF_OPTS(bpf_uprobe_opts, uprobe_opts);

	DECLARE_LIBBPF_OPTS(bpf_kprobe_opts, kprobe_opts);

	struct bpf_link *kprobe_link, *kretprobe_link;

	struct bpf_link *uprobe_link, *uretprobe_link;

	struct test_attach_probe_manual *skel;

	ssize_t uprobe_offset;



	skel = test_attach_probe_manual__open_and_load();

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

		return;



	uprobe_offset = get_uprobe_offset(&trigger_func);

	if (!ASSERT_GE(uprobe_offset, 0, "uprobe_offset"))

		goto cleanup;



	/* manual-attach kprobe/kretprobe */

	kprobe_link = bpf_program__attach_kprobe(skel->progs.handle_kprobe,

						 false /* retprobe */,

						 SYS_NANOSLEEP_KPROBE_NAME);

	kprobe_opts.attach_mode = attach_mode;

	kprobe_opts.retprobe = false;

	kprobe_link = bpf_program__attach_kprobe_opts(skel->progs.handle_kprobe,

						      SYS_NANOSLEEP_KPROBE_NAME,

						      &kprobe_opts);

	if (!ASSERT_OK_PTR(kprobe_link, "attach_kprobe"))

		goto cleanup;

	skel->links.handle_kprobe = kprobe_link;



	kretprobe_link = bpf_program__attach_kprobe(skel->progs.handle_kretprobe,

						    true /* retprobe */,

						    SYS_NANOSLEEP_KPROBE_NAME);

	kprobe_opts.retprobe = true;

	kretprobe_link = bpf_program__attach_kprobe_opts(skel->progs.handle_kretprobe,

							 SYS_NANOSLEEP_KPROBE_NAME,

							 &kprobe_opts);

	if (!ASSERT_OK_PTR(kretprobe_link, "attach_kretprobe"))

		goto cleanup;

	skel->links.handle_kretprobe = kretprobe_link;



	/* manual-attach uprobe/uretprobe */

	uprobe_opts.attach_mode = attach_mode;

	uprobe_opts.ref_ctr_offset = 0;

	uprobe_opts.retprobe = false;

	uprobe_link = bpf_program__attach_uprobe_opts(skel->progs.handle_uprobe,
@@ -108,6 +119,7 @@ static void test_attach_probe_manual(struct test_attach_probe *skel) 
	ASSERT_EQ(skel->bss->uprobe_byname_res, 5, "check_uprobe_byname_res");



cleanup:

	test_attach_probe_manual__destroy(skel);

}



static void test_attach_probe_auto(struct test_attach_probe *skel)
@@ -289,8 +301,15 @@ void test_attach_probe(void) 
	if (!ASSERT_OK_PTR(skel->bss, "check_bss"))

		goto cleanup;



	if (test__start_subtest("manual"))

		test_attach_probe_manual(skel);

	if (test__start_subtest("manual-default"))

		test_attach_probe_manual(PROBE_ATTACH_MODE_DEFAULT);

	if (test__start_subtest("manual-legacy"))

		test_attach_probe_manual(PROBE_ATTACH_MODE_LEGACY);

	if (test__start_subtest("manual-perf"))

		test_attach_probe_manual(PROBE_ATTACH_MODE_PERF);

	if (test__start_subtest("manual-link"))

		test_attach_probe_manual(PROBE_ATTACH_MODE_LINK);



	if (test__start_subtest("auto"))

		test_attach_probe_auto(skel);

	if (test__start_subtest("kprobe-sleepable"))

tools/testing/selftests/bpf/progs/test_attach_probe.c

+0 −32
Original line number Diff line number Diff line
@@ -7,12 +7,8 @@ 
#include <bpf/bpf_core_read.h>

#include "bpf_misc.h"



int kprobe_res = 0;

int kprobe2_res = 0;

int kretprobe_res = 0;

int kretprobe2_res = 0;

int uprobe_res = 0;

int uretprobe_res = 0;

int uprobe_byname_res = 0;

int uretprobe_byname_res = 0;

int uprobe_byname2_res = 0;
@@ -23,13 +19,6 @@ int uretprobe_byname3_sleepable_res = 0; 
int uretprobe_byname3_res = 0;

void *user_ptr = 0;



SEC("kprobe")

int handle_kprobe(struct pt_regs *ctx)

{

	kprobe_res = 1;

	return 0;

}



SEC("ksyscall/nanosleep")

int BPF_KSYSCALL(handle_kprobe_auto, struct __kernel_timespec *req, struct __kernel_timespec *rem)

{
@@ -37,13 +26,6 @@ int BPF_KSYSCALL(handle_kprobe_auto, struct __kernel_timespec *req, struct __ker 
	return 0;

}



SEC("kretprobe")

int handle_kretprobe(struct pt_regs *ctx)

{

	kretprobe_res = 2;

	return 0;

}



SEC("kretsyscall/nanosleep")

int BPF_KRETPROBE(handle_kretprobe_auto, int ret)

{
@@ -51,20 +33,6 @@ int BPF_KRETPROBE(handle_kretprobe_auto, int ret) 
	return ret;

}



SEC("uprobe")

int handle_uprobe(struct pt_regs *ctx)

{

	uprobe_res = 3;

	return 0;

}



SEC("uretprobe")

int handle_uretprobe(struct pt_regs *ctx)

{

	uretprobe_res = 4;

	return 0;

}



SEC("uprobe")

int handle_uprobe_ref_ctr(struct pt_regs *ctx)

{

tools/testing/selftests/bpf/progs/test_attach_probe_manual.c

0 → 100644
+53 −0
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0

// Copyright (c) 2017 Facebook



#include "vmlinux.h"

#include <bpf/bpf_helpers.h>

#include <bpf/bpf_tracing.h>

#include <bpf/bpf_core_read.h>

#include "bpf_misc.h"



int kprobe_res = 0;

int kretprobe_res = 0;

int uprobe_res = 0;

int uretprobe_res = 0;

int uprobe_byname_res = 0;

void *user_ptr = 0;



SEC("kprobe")

int handle_kprobe(struct pt_regs *ctx)

{

	kprobe_res = 1;

	return 0;

}



SEC("kretprobe")

int handle_kretprobe(struct pt_regs *ctx)

{

	kretprobe_res = 2;

	return 0;

}



SEC("uprobe")

int handle_uprobe(struct pt_regs *ctx)

{

	uprobe_res = 3;

	return 0;

}



SEC("uretprobe")

int handle_uretprobe(struct pt_regs *ctx)

{

	uretprobe_res = 4;

	return 0;

}



SEC("uprobe")

int handle_uprobe_byname(struct pt_regs *ctx)

{

	uprobe_byname_res = 5;

	return 0;

}





char _license[] SEC("license") = "GPL";