1 files changed, 195 insertions, 96 deletions

diff --git a/tools/testing/selftests/bpf/prog_tests/attach_probe.c b/tools/testing/selftests/bpf/prog_tests/attach_probe.c
index 56374c8b5436..7175af39134f 100644
--- a/tools/testing/selftests/bpf/prog_tests/attach_probe.c
+++ b/tools/testing/selftests/bpf/prog_tests/attach_probe.c
@@ -1,5 +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 */
@@ -23,81 +25,54 @@ static noinline void trigger_func3(void)
 	asm volatile ("");
 }
 
+/* attach point for ref_ctr */
+static noinline void trigger_func4(void)
+{
+	asm volatile ("");
+}
+
 static char test_data[] = "test_data";
 
-void test_attach_probe(void)
+/* manual attach kprobe/kretprobe/uprobe/uretprobe testings */
+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* skel;
-	ssize_t uprobe_offset, ref_ctr_offset;
-	struct bpf_link *uprobe_err_link;
-	FILE *devnull;
-	bool legacy;
-
-	/* Check if new-style kprobe/uprobe API is supported.
-	 * Kernels that support new FD-based kprobe and uprobe BPF attachment
-	 * through perf_event_open() syscall expose
-	 * /sys/bus/event_source/devices/kprobe/type and
-	 * /sys/bus/event_source/devices/uprobe/type files, respectively. They
-	 * contain magic numbers that are passed as "type" field of
-	 * perf_event_attr. Lack of such file in the system indicates legacy
-	 * kernel with old-style kprobe/uprobe attach interface through
-	 * creating per-probe event through tracefs. For such cases
-	 * ref_ctr_offset feature is not supported, so we don't test it.
-	 */
-	legacy = access("/sys/bus/event_source/devices/kprobe/type", F_OK) != 0;
+	struct test_attach_probe_manual *skel;
+	ssize_t uprobe_offset;
 
-	uprobe_offset = get_uprobe_offset(&trigger_func);
-	if (!ASSERT_GE(uprobe_offset, 0, "uprobe_offset"))
+	skel = test_attach_probe_manual__open_and_load();
+	if (!ASSERT_OK_PTR(skel, "skel_kprobe_manual_open_and_load"))
 		return;
 
-	ref_ctr_offset = get_rel_offset((uintptr_t)&uprobe_ref_ctr);
-	if (!ASSERT_GE(ref_ctr_offset, 0, "ref_ctr_offset"))
-		return;
-
-	skel = test_attach_probe__open();
-	if (!ASSERT_OK_PTR(skel, "skel_open"))
-		return;
-
-	/* sleepable kprobe test case needs flags set before loading */
-	if (!ASSERT_OK(bpf_program__set_flags(skel->progs.handle_kprobe_sleepable,
-		BPF_F_SLEEPABLE), "kprobe_sleepable_flags"))
-		goto cleanup;
-
-	if (!ASSERT_OK(test_attach_probe__load(skel), "skel_load"))
-		goto cleanup;
-	if (!ASSERT_OK_PTR(skel->bss, "check_bss"))
+	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;
 
-	/* auto-attachable kprobe and kretprobe */
-	skel->links.handle_kprobe_auto = bpf_program__attach(skel->progs.handle_kprobe_auto);
-	ASSERT_OK_PTR(skel->links.handle_kprobe_auto, "attach_kprobe_auto");
-
-	skel->links.handle_kretprobe_auto = bpf_program__attach(skel->progs.handle_kretprobe_auto);
-	ASSERT_OK_PTR(skel->links.handle_kretprobe_auto, "attach_kretprobe_auto");
-
-	if (!legacy)
-		ASSERT_EQ(uprobe_ref_ctr, 0, "uprobe_ref_ctr_before");
-
+	/* manual-attach uprobe/uretprobe */
+	uprobe_opts.attach_mode = attach_mode;
+	uprobe_opts.ref_ctr_offset = 0;
 	uprobe_opts.retprobe = false;
-	uprobe_opts.ref_ctr_offset = legacy ? 0 : ref_ctr_offset;
 	uprobe_link = bpf_program__attach_uprobe_opts(skel->progs.handle_uprobe,
 						      0 /* self pid */,
 						      "/proc/self/exe",
@@ -107,12 +82,7 @@ void test_attach_probe(void)
 		goto cleanup;
 	skel->links.handle_uprobe = uprobe_link;
 
-	if (!legacy)
-		ASSERT_GT(uprobe_ref_ctr, 0, "uprobe_ref_ctr_after");
-
-	/* if uprobe uses ref_ctr, uretprobe has to use ref_ctr as well */
 	uprobe_opts.retprobe = true;
-	uprobe_opts.ref_ctr_offset = legacy ? 0 : ref_ctr_offset;
 	uretprobe_link = bpf_program__attach_uprobe_opts(skel->progs.handle_uretprobe,
 							 -1 /* any pid */,
 							 "/proc/self/exe",
@@ -121,12 +91,7 @@ void test_attach_probe(void)
 		goto cleanup;
 	skel->links.handle_uretprobe = uretprobe_link;
 
-	/* verify auto-attach fails for old-style uprobe definition */
-	uprobe_err_link = bpf_program__attach(skel->progs.handle_uprobe_byname);
-	if (!ASSERT_EQ(libbpf_get_error(uprobe_err_link), -EOPNOTSUPP,
-		       "auto-attach should fail for old-style name"))
-		goto cleanup;
-
+	/* attach uprobe by function name manually */
 	uprobe_opts.func_name = "trigger_func2";
 	uprobe_opts.retprobe = false;
 	uprobe_opts.ref_ctr_offset = 0;
@@ -138,11 +103,63 @@ void test_attach_probe(void)
 	if (!ASSERT_OK_PTR(skel->links.handle_uprobe_byname, "attach_uprobe_byname"))
 		goto cleanup;
 
+	/* trigger & validate kprobe && kretprobe */
+	usleep(1);
+
+	/* trigger & validate uprobe & uretprobe */
+	trigger_func();
+
+	/* trigger & validate uprobe attached by name */
+	trigger_func2();
+
+	ASSERT_EQ(skel->bss->kprobe_res, 1, "check_kprobe_res");
+	ASSERT_EQ(skel->bss->kretprobe_res, 2, "check_kretprobe_res");
+	ASSERT_EQ(skel->bss->uprobe_res, 3, "check_uprobe_res");
+	ASSERT_EQ(skel->bss->uretprobe_res, 4, "check_uretprobe_res");
+	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)
+{
+	struct bpf_link *uprobe_err_link;
+
+	/* auto-attachable kprobe and kretprobe */
+	skel->links.handle_kprobe_auto = bpf_program__attach(skel->progs.handle_kprobe_auto);
+	ASSERT_OK_PTR(skel->links.handle_kprobe_auto, "attach_kprobe_auto");
+
+	skel->links.handle_kretprobe_auto = bpf_program__attach(skel->progs.handle_kretprobe_auto);
+	ASSERT_OK_PTR(skel->links.handle_kretprobe_auto, "attach_kretprobe_auto");
+
+	/* verify auto-attach fails for old-style uprobe definition */
+	uprobe_err_link = bpf_program__attach(skel->progs.handle_uprobe_byname);
+	if (!ASSERT_EQ(libbpf_get_error(uprobe_err_link), -EOPNOTSUPP,
+		       "auto-attach should fail for old-style name"))
+		return;
+
 	/* verify auto-attach works */
 	skel->links.handle_uretprobe_byname =
 			bpf_program__attach(skel->progs.handle_uretprobe_byname);
 	if (!ASSERT_OK_PTR(skel->links.handle_uretprobe_byname, "attach_uretprobe_byname"))
-		goto cleanup;
+		return;
+
+	/* trigger & validate kprobe && kretprobe */
+	usleep(1);
+
+	/* trigger & validate uprobe attached by name */
+	trigger_func2();
+
+	ASSERT_EQ(skel->bss->kprobe2_res, 11, "check_kprobe_auto_res");
+	ASSERT_EQ(skel->bss->kretprobe2_res, 22, "check_kretprobe_auto_res");
+	ASSERT_EQ(skel->bss->uretprobe_byname_res, 6, "check_uretprobe_byname_res");
+}
+
+static void test_uprobe_lib(struct test_attach_probe *skel)
+{
+	DECLARE_LIBBPF_OPTS(bpf_uprobe_opts, uprobe_opts);
+	FILE *devnull;
 
 	/* test attach by name for a library function, using the library
 	 * as the binary argument. libc.so.6 will be resolved via dlopen()/dlinfo().
@@ -155,7 +172,7 @@ void test_attach_probe(void)
 							"libc.so.6",
 							0, &uprobe_opts);
 	if (!ASSERT_OK_PTR(skel->links.handle_uprobe_byname2, "attach_uprobe_byname2"))
-		goto cleanup;
+		return;
 
 	uprobe_opts.func_name = "fclose";
 	uprobe_opts.retprobe = true;
@@ -165,62 +182,144 @@ void test_attach_probe(void)
 							"libc.so.6",
 							0, &uprobe_opts);
 	if (!ASSERT_OK_PTR(skel->links.handle_uretprobe_byname2, "attach_uretprobe_byname2"))
+		return;
+
+	/* trigger & validate shared library u[ret]probes attached by name */
+	devnull = fopen("/dev/null", "r");
+	fclose(devnull);
+
+	ASSERT_EQ(skel->bss->uprobe_byname2_res, 7, "check_uprobe_byname2_res");
+	ASSERT_EQ(skel->bss->uretprobe_byname2_res, 8, "check_uretprobe_byname2_res");
+}
+
+static void test_uprobe_ref_ctr(struct test_attach_probe *skel)
+{
+	DECLARE_LIBBPF_OPTS(bpf_uprobe_opts, uprobe_opts);
+	struct bpf_link *uprobe_link, *uretprobe_link;
+	ssize_t uprobe_offset, ref_ctr_offset;
+
+	uprobe_offset = get_uprobe_offset(&trigger_func4);
+	if (!ASSERT_GE(uprobe_offset, 0, "uprobe_offset_ref_ctr"))
+		return;
+
+	ref_ctr_offset = get_rel_offset((uintptr_t)&uprobe_ref_ctr);
+	if (!ASSERT_GE(ref_ctr_offset, 0, "ref_ctr_offset"))
+		return;
+
+	ASSERT_EQ(uprobe_ref_ctr, 0, "uprobe_ref_ctr_before");
+
+	uprobe_opts.retprobe = false;
+	uprobe_opts.ref_ctr_offset = ref_ctr_offset;
+	uprobe_link = bpf_program__attach_uprobe_opts(skel->progs.handle_uprobe_ref_ctr,
+						      0 /* self pid */,
+						      "/proc/self/exe",
+						      uprobe_offset,
+						      &uprobe_opts);
+	if (!ASSERT_OK_PTR(uprobe_link, "attach_uprobe_ref_ctr"))
+		return;
+	skel->links.handle_uprobe_ref_ctr = uprobe_link;
+
+	ASSERT_GT(uprobe_ref_ctr, 0, "uprobe_ref_ctr_after");
+
+	/* if uprobe uses ref_ctr, uretprobe has to use ref_ctr as well */
+	uprobe_opts.retprobe = true;
+	uprobe_opts.ref_ctr_offset = ref_ctr_offset;
+	uretprobe_link = bpf_program__attach_uprobe_opts(skel->progs.handle_uretprobe_ref_ctr,
+							 -1 /* any pid */,
+							 "/proc/self/exe",
+							 uprobe_offset, &uprobe_opts);
+	if (!ASSERT_OK_PTR(uretprobe_link, "attach_uretprobe_ref_ctr"))
+		return;
+	skel->links.handle_uretprobe_ref_ctr = uretprobe_link;
+}
+
+static void test_kprobe_sleepable(void)
+{
+	struct test_attach_kprobe_sleepable *skel;
+
+	skel = test_attach_kprobe_sleepable__open();
+	if (!ASSERT_OK_PTR(skel, "skel_kprobe_sleepable_open"))
+		return;
+
+	/* sleepable kprobe test case needs flags set before loading */
+	if (!ASSERT_OK(bpf_program__set_flags(skel->progs.handle_kprobe_sleepable,
+		BPF_F_SLEEPABLE), "kprobe_sleepable_flags"))
+		goto cleanup;
+
+	if (!ASSERT_OK(test_attach_kprobe_sleepable__load(skel),
+		       "skel_kprobe_sleepable_load"))
 		goto cleanup;
 
 	/* sleepable kprobes should not attach successfully */
 	skel->links.handle_kprobe_sleepable = bpf_program__attach(skel->progs.handle_kprobe_sleepable);
-	if (!ASSERT_ERR_PTR(skel->links.handle_kprobe_sleepable, "attach_kprobe_sleepable"))
-		goto cleanup;
+	ASSERT_ERR_PTR(skel->links.handle_kprobe_sleepable, "attach_kprobe_sleepable");
 
+cleanup:
+	test_attach_kprobe_sleepable__destroy(skel);
+}
+
+static void test_uprobe_sleepable(struct test_attach_probe *skel)
+{
 	/* test sleepable uprobe and uretprobe variants */
 	skel->links.handle_uprobe_byname3_sleepable = bpf_program__attach(skel->progs.handle_uprobe_byname3_sleepable);
 	if (!ASSERT_OK_PTR(skel->links.handle_uprobe_byname3_sleepable, "attach_uprobe_byname3_sleepable"))
-		goto cleanup;
+		return;
 
 	skel->links.handle_uprobe_byname3 = bpf_program__attach(skel->progs.handle_uprobe_byname3);
 	if (!ASSERT_OK_PTR(skel->links.handle_uprobe_byname3, "attach_uprobe_byname3"))
-		goto cleanup;
+		return;
 
 	skel->links.handle_uretprobe_byname3_sleepable = bpf_program__attach(skel->progs.handle_uretprobe_byname3_sleepable);
 	if (!ASSERT_OK_PTR(skel->links.handle_uretprobe_byname3_sleepable, "attach_uretprobe_byname3_sleepable"))
-		goto cleanup;
+		return;
 
 	skel->links.handle_uretprobe_byname3 = bpf_program__attach(skel->progs.handle_uretprobe_byname3);
 	if (!ASSERT_OK_PTR(skel->links.handle_uretprobe_byname3, "attach_uretprobe_byname3"))
-		goto cleanup;
+		return;
 
 	skel->bss->user_ptr = test_data;
 
-	/* trigger & validate kprobe && kretprobe */
-	usleep(1);
-
-	/* trigger & validate shared library u[ret]probes attached by name */
-	devnull = fopen("/dev/null", "r");
-	fclose(devnull);
-
-	/* trigger & validate uprobe & uretprobe */
-	trigger_func();
-
-	/* trigger & validate uprobe attached by name */
-	trigger_func2();
-
 	/* trigger & validate sleepable uprobe attached by name */
 	trigger_func3();
 
-	ASSERT_EQ(skel->bss->kprobe_res, 1, "check_kprobe_res");
-	ASSERT_EQ(skel->bss->kprobe2_res, 11, "check_kprobe_auto_res");
-	ASSERT_EQ(skel->bss->kretprobe_res, 2, "check_kretprobe_res");
-	ASSERT_EQ(skel->bss->kretprobe2_res, 22, "check_kretprobe_auto_res");
-	ASSERT_EQ(skel->bss->uprobe_res, 3, "check_uprobe_res");
-	ASSERT_EQ(skel->bss->uretprobe_res, 4, "check_uretprobe_res");
-	ASSERT_EQ(skel->bss->uprobe_byname_res, 5, "check_uprobe_byname_res");
-	ASSERT_EQ(skel->bss->uretprobe_byname_res, 6, "check_uretprobe_byname_res");
-	ASSERT_EQ(skel->bss->uprobe_byname2_res, 7, "check_uprobe_byname2_res");
-	ASSERT_EQ(skel->bss->uretprobe_byname2_res, 8, "check_uretprobe_byname2_res");
 	ASSERT_EQ(skel->bss->uprobe_byname3_sleepable_res, 9, "check_uprobe_byname3_sleepable_res");
 	ASSERT_EQ(skel->bss->uprobe_byname3_res, 10, "check_uprobe_byname3_res");
 	ASSERT_EQ(skel->bss->uretprobe_byname3_sleepable_res, 11, "check_uretprobe_byname3_sleepable_res");
 	ASSERT_EQ(skel->bss->uretprobe_byname3_res, 12, "check_uretprobe_byname3_res");
+}
+
+void test_attach_probe(void)
+{
+	struct test_attach_probe *skel;
+
+	skel = test_attach_probe__open();
+	if (!ASSERT_OK_PTR(skel, "skel_open"))
+		return;
+
+	if (!ASSERT_OK(test_attach_probe__load(skel), "skel_load"))
+		goto cleanup;
+	if (!ASSERT_OK_PTR(skel->bss, "check_bss"))
+		goto cleanup;
+
+	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"))
+		test_kprobe_sleepable();
+	if (test__start_subtest("uprobe-lib"))
+		test_uprobe_lib(skel);
+	if (test__start_subtest("uprobe-sleepable"))
+		test_uprobe_sleepable(skel);
+	if (test__start_subtest("uprobe-ref_ctr"))
+		test_uprobe_ref_ctr(skel);
 
 cleanup:
 	test_attach_probe__destroy(skel);