Commit b2440443 authored by Jiri Olsa's avatar Jiri Olsa Committed by Alexei Starovoitov
Browse files

selftests/bpf: Add kprobe_multi kmod attach api tests 



Adding kprobe_multi kmod attach api tests that attach bpf_testmod
functions via bpf_program__attach_kprobe_multi_opts.

Running it as serial test, because we don't want other tests to
reload bpf_testmod while it's running.

Acked-by: default avatarSong Liu <song@kernel.org>
Signed-off-by: default avatarJiri Olsa <jolsa@kernel.org>
Link: https://lore.kernel.org/r/20221025134148.3300700-9-jolsa@kernel.org


Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
parent e697d8dc

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

0 → 100644
+89 −0
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0

#include <test_progs.h>

#include "kprobe_multi.skel.h"

#include "trace_helpers.h"

#include "bpf/libbpf_internal.h"



static void kprobe_multi_testmod_check(struct kprobe_multi *skel)

{

	ASSERT_EQ(skel->bss->kprobe_testmod_test1_result, 1, "kprobe_test1_result");

	ASSERT_EQ(skel->bss->kprobe_testmod_test2_result, 1, "kprobe_test2_result");

	ASSERT_EQ(skel->bss->kprobe_testmod_test3_result, 1, "kprobe_test3_result");



	ASSERT_EQ(skel->bss->kretprobe_testmod_test1_result, 1, "kretprobe_test1_result");

	ASSERT_EQ(skel->bss->kretprobe_testmod_test2_result, 1, "kretprobe_test2_result");

	ASSERT_EQ(skel->bss->kretprobe_testmod_test3_result, 1, "kretprobe_test3_result");

}



static void test_testmod_attach_api(struct bpf_kprobe_multi_opts *opts)

{

	struct kprobe_multi *skel = NULL;



	skel = kprobe_multi__open_and_load();

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

		return;



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



	skel->links.test_kprobe_testmod = bpf_program__attach_kprobe_multi_opts(

						skel->progs.test_kprobe_testmod,

						NULL, opts);

	if (!skel->links.test_kprobe_testmod)

		goto cleanup;



	opts->retprobe = true;

	skel->links.test_kretprobe_testmod = bpf_program__attach_kprobe_multi_opts(

						skel->progs.test_kretprobe_testmod,

						NULL, opts);

	if (!skel->links.test_kretprobe_testmod)

		goto cleanup;



	ASSERT_OK(trigger_module_test_read(1), "trigger_read");

	kprobe_multi_testmod_check(skel);



cleanup:

	kprobe_multi__destroy(skel);

}



static void test_testmod_attach_api_addrs(void)

{

	LIBBPF_OPTS(bpf_kprobe_multi_opts, opts);

	unsigned long long addrs[3];



	addrs[0] = ksym_get_addr("bpf_testmod_fentry_test1");

	ASSERT_NEQ(addrs[0], 0, "ksym_get_addr");

	addrs[1] = ksym_get_addr("bpf_testmod_fentry_test2");

	ASSERT_NEQ(addrs[1], 0, "ksym_get_addr");

	addrs[2] = ksym_get_addr("bpf_testmod_fentry_test3");

	ASSERT_NEQ(addrs[2], 0, "ksym_get_addr");



	opts.addrs = (const unsigned long *) addrs;

	opts.cnt = ARRAY_SIZE(addrs);



	test_testmod_attach_api(&opts);

}



static void test_testmod_attach_api_syms(void)

{

	LIBBPF_OPTS(bpf_kprobe_multi_opts, opts);

	const char *syms[3] = {

		"bpf_testmod_fentry_test1",

		"bpf_testmod_fentry_test2",

		"bpf_testmod_fentry_test3",

	};



	opts.syms = syms;

	opts.cnt = ARRAY_SIZE(syms);

	test_testmod_attach_api(&opts);

}



void serial_test_kprobe_multi_testmod_test(void)

{

	if (!ASSERT_OK(load_kallsyms_refresh(), "load_kallsyms_refresh"))

		return;



	if (test__start_subtest("testmod_attach_api_syms"))

		test_testmod_attach_api_syms();

	if (test__start_subtest("testmod_attach_api_addrs"))

		test_testmod_attach_api_addrs();

}

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

+50 −0
Original line number Diff line number Diff line
@@ -110,3 +110,53 @@ int test_kretprobe_manual(struct pt_regs *ctx) 
	kprobe_multi_check(ctx, true);

	return 0;

}



extern const void bpf_testmod_fentry_test1 __ksym;

extern const void bpf_testmod_fentry_test2 __ksym;

extern const void bpf_testmod_fentry_test3 __ksym;



__u64 kprobe_testmod_test1_result = 0;

__u64 kprobe_testmod_test2_result = 0;

__u64 kprobe_testmod_test3_result = 0;



__u64 kretprobe_testmod_test1_result = 0;

__u64 kretprobe_testmod_test2_result = 0;

__u64 kretprobe_testmod_test3_result = 0;



static void kprobe_multi_testmod_check(void *ctx, bool is_return)

{

	if (bpf_get_current_pid_tgid() >> 32 != pid)

		return;



	__u64 addr = bpf_get_func_ip(ctx);



	if (is_return) {

		if ((const void *) addr == &bpf_testmod_fentry_test1)

			kretprobe_testmod_test1_result = 1;

		if ((const void *) addr == &bpf_testmod_fentry_test2)

			kretprobe_testmod_test2_result = 1;

		if ((const void *) addr == &bpf_testmod_fentry_test3)

			kretprobe_testmod_test3_result = 1;

	} else {

		if ((const void *) addr == &bpf_testmod_fentry_test1)

			kprobe_testmod_test1_result = 1;

		if ((const void *) addr == &bpf_testmod_fentry_test2)

			kprobe_testmod_test2_result = 1;

		if ((const void *) addr == &bpf_testmod_fentry_test3)

			kprobe_testmod_test3_result = 1;

	}

}



SEC("kprobe.multi")

int test_kprobe_testmod(struct pt_regs *ctx)

{

	kprobe_multi_testmod_check(ctx, false);

	return 0;

}



SEC("kretprobe.multi")

int test_kretprobe_testmod(struct pt_regs *ctx)

{

	kprobe_multi_testmod_check(ctx, true);

	return 0;

}