netdev - Re: [PATCH v4 bpf-next 5/5] selftests/bpf: add tests for uprobe auto-attach via skeleton

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Message-ID: <829ace90-17fa-5076-b213-30357b1c4776@iogearbox.net>
Date:   Mon, 14 Mar 2022 23:26:07 +0100
From:   Daniel Borkmann <daniel@...earbox.net>
To:     Alan Maguire <alan.maguire@...cle.com>, ast@...nel.org,
        andrii@...nel.org
Cc:     kafai@...com, songliubraving@...com, yhs@...com,
        john.fastabend@...il.com, kpsingh@...nel.org, toke@...hat.com,
        sunyucong@...il.com, netdev@...r.kernel.org, bpf@...r.kernel.org
Subject: Re: [PATCH v4 bpf-next 5/5] selftests/bpf: add tests for uprobe
 auto-attach via skeleton

On 3/11/22 1:10 PM, Alan Maguire wrote:
> tests that verify auto-attach works for function entry/return for
> local functions in program, library functions in program and library
> functions in library.
> 
> Signed-off-by: Alan Maguire <alan.maguire@...cle.com>
> ---
>   .../selftests/bpf/prog_tests/uprobe_autoattach.c   | 48 +++++++++++++++
>   .../selftests/bpf/progs/test_uprobe_autoattach.c   | 69 ++++++++++++++++++++++
>   2 files changed, 117 insertions(+)
>   create mode 100644 tools/testing/selftests/bpf/prog_tests/uprobe_autoattach.c
>   create mode 100644 tools/testing/selftests/bpf/progs/test_uprobe_autoattach.c
> 
> diff --git a/tools/testing/selftests/bpf/prog_tests/uprobe_autoattach.c b/tools/testing/selftests/bpf/prog_tests/uprobe_autoattach.c
> new file mode 100644
> index 0000000..57ed636
> --- /dev/null
> +++ b/tools/testing/selftests/bpf/prog_tests/uprobe_autoattach.c
> @@ -0,0 +1,48 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/* Copyright (c) 2022, Oracle and/or its affiliates. */
> +
> +#include <test_progs.h>
> +#include "test_uprobe_autoattach.skel.h"
> +
> +/* uprobe attach point */
> +static void autoattach_trigger_func(void)
> +{
> +	asm volatile ("");
> +}
> +
> +void test_uprobe_autoattach(void)
> +{
> +	struct test_uprobe_autoattach *skel;
> +	char *mem;
> +
> +	skel = test_uprobe_autoattach__open_and_load();
> +	if (!ASSERT_OK_PTR(skel, "skel_open"))
> +		return;
> +	if (!ASSERT_OK_PTR(skel->bss, "check_bss"))
> +		goto cleanup;
> +
> +	if (!ASSERT_OK(test_uprobe_autoattach__attach(skel), "skel_attach"))
> +		goto cleanup;
> +
> +	/* trigger & validate uprobe & uretprobe */
> +	autoattach_trigger_func();
> +
> +	/* trigger & validate shared library u[ret]probes attached by name */
> +	mem = malloc(1);
> +	free(mem);
> +
> +	if (!ASSERT_EQ(skel->bss->uprobe_byname_res, 1, "check_uprobe_byname_res"))
> +		goto cleanup;
> +	if (!ASSERT_EQ(skel->bss->uretprobe_byname_res, 2, "check_uretprobe_byname_res"))
> +		goto cleanup;
> +	if (!ASSERT_EQ(skel->bss->uprobe_byname2_res, 3, "check_uprobe_byname2_res"))
> +		goto cleanup;
> +	if (!ASSERT_EQ(skel->bss->uretprobe_byname2_res, 4, "check_uretprobe_byname2_res"))
> +		goto cleanup;
> +	if (!ASSERT_EQ(skel->bss->uprobe_byname3_res, 5, "check_uprobe_byname3_res"))
> +		goto cleanup;
> +	if (!ASSERT_EQ(skel->bss->uretprobe_byname3_res, 6, "check_uretprobe_byname3_res"))
> +		goto cleanup;
> +cleanup:
> +	test_uprobe_autoattach__destroy(skel);
> +}

Hmm, looks like this fails CI, ptal:

https://github.com/kernel-patches/bpf/runs/5517172330?check_suite_focus=true

[...]
   test_attach_probe:PASS:uprobe_offset 0 nsec
   test_attach_probe:PASS:ref_ctr_offset 0 nsec
   test_attach_probe:PASS:skel_open 0 nsec
   test_attach_probe:PASS:check_bss 0 nsec
   test_attach_probe:PASS:attach_kprobe 0 nsec
   test_attach_probe:PASS:attach_kretprobe 0 nsec
   test_attach_probe:PASS:uprobe_ref_ctr_before 0 nsec
   test_attach_probe:PASS:attach_uprobe 0 nsec
   test_attach_probe:PASS:uprobe_ref_ctr_after 0 nsec
   test_attach_probe:PASS:attach_uretprobe 0 nsec
   test_attach_probe:PASS:auto-attach should fail for old-style name 0 nsec
   test_attach_probe:PASS:attach_uprobe_byname 0 nsec
   test_attach_probe:PASS:attach_uretprobe_byname 0 nsec
   test_attach_probe:PASS:attach_uprobe_byname2 0 nsec
   test_attach_probe:PASS:attach_uretprobe_byname2 0 nsec
   test_attach_probe:PASS:check_kprobe_res 0 nsec
   test_attach_probe:PASS:check_kretprobe_res 0 nsec
   test_attach_probe:PASS:check_uprobe_res 0 nsec
   test_attach_probe:PASS:check_uretprobe_res 0 nsec
   test_attach_probe:PASS:check_uprobe_byname_res 0 nsec
   test_attach_probe:PASS:check_uretprobe_byname_res 0 nsec
   test_attach_probe:PASS:check_uprobe_byname2_res 0 nsec
   test_attach_probe:FAIL:check_uretprobe_byname2_res unexpected check_uretprobe_byname2_res: actual 0 != expected 8
   test_attach_probe:PASS:uprobe_ref_ctr_cleanup 0 nsec
   #4 attach_probe:FAIL
[...]