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: Menglong Dong <imagedong@tencent.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Reviewed-by: Biao Jiang <benbjiang@tencent.com>
Link: https://lore.kernel.org/bpf/20230306064833.7932-4-imagedong@tencent.com

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

@@ -1,6 +1,7 @@
 // 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

@@ -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;
@@ -23,48 +19,20 @@ 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)
 {
 	kprobe2_res = 11;
 	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)
 {
 	kretprobe2_res = 22;
 	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

@@ -0,0 +1,53 @@
+// 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";