From patchwork Thu Sep 5 11:51:23 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jiri Olsa X-Patchwork-Id: 13792209 X-Patchwork-Delegate: bpf@iogearbox.net Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 22BF719415D; Thu, 5 Sep 2024 11:52:02 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725537122; cv=none; b=WJFpBBjUS5x5lAo9B/brGY5whFX1pzpF6BixZd8mOv5e6bka+XxrD8eRtTcquRJ9vyFuJmPjGWKl89Q3SUaxHkbvgHJ7YfhWHL4Qa2ZaTgnKxGd3f/Z+4gJkQHStXDNUF9Psup7QgbAv9TnMkTxwaZtEw9YLjmrgMsNt4Q4A2eY= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725537122; c=relaxed/simple; bh=9iP/a/0C/4mf7TSl4LPVhAesSJyyFh+wAjB+jhDjfNc=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=FkEcOnYDuuOCKoSQ8epjeSY1kLp8pqWfIPq/XWlouAFaDamAo9sf3jBkXofc62JeFJUV/MfsahUFoTW8SVOFueN1J0uBvjcHRT5UkaybFQqYSgTfX2dU3f8jJfnqwNxT0is1VbxEdO4mtm0K2ridDsF4Q8wrIZaCNki6zmrO9f8= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=HQavZxQd; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="HQavZxQd" Received: by smtp.kernel.org (Postfix) with ESMTPSA id DE630C4CEC3; Thu, 5 Sep 2024 11:51:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1725537122; bh=9iP/a/0C/4mf7TSl4LPVhAesSJyyFh+wAjB+jhDjfNc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=HQavZxQdr0wBbbeK6n45c7TtfLHJySh2+Qh593SbgFv3CnG7vX5g0lxe7jJ/q2pn8 AJ/6r7WF7R2q2eJR0twp0zfcTQDaoZlP90FpCEbTaJgSP0TSedUqH+KFXYygEuH9Pe 65JczbNylMVX/GvNleEOMmhwmXk0JgdsIdzbh1p5LDTHCTF2MkNSBD868VmT/UOLWa gJ0aziz7DRv1qHo0eIcGGeXEaB2UpUn2ueLH2oGYvd3nfSm5EPVbkqnlP0sq/K0aXl TdwSkOxV9IWRyrBDf/8o0xrXjeycH7Ccl+XQqfL+EHifHm8BQxZheSpy4fZnzH2jiN xXXi4hpiqUF5Q== From: Jiri Olsa To: Oleg Nesterov , Peter Zijlstra , Andrii Nakryiko , Tianyi Liu , Masami Hiramatsu Cc: bpf@vger.kernel.org, Steven Rostedt , linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org Subject: [PATCHv2 bpf-next 3/4] selftests/bpf: Add uprobe multi pid filter test for fork-ed processes Date: Thu, 5 Sep 2024 14:51:23 +0300 Message-ID: <20240905115124.1503998-4-jolsa@kernel.org> X-Mailer: git-send-email 2.46.0 In-Reply-To: <20240905115124.1503998-1-jolsa@kernel.org> References: <20240905115124.1503998-1-jolsa@kernel.org> Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Patchwork-Delegate: bpf@iogearbox.net The idea is to create and monitor 3 uprobes, each trigered in separate process and make sure the bpf program gets executed just for the proper PID specified via pid filter. Signed-off-by: Jiri Olsa --- .../bpf/prog_tests/uprobe_multi_test.c | 67 +++++++++++++++++++ .../bpf/progs/uprobe_multi_pid_filter.c | 40 +++++++++++ 2 files changed, 107 insertions(+) create mode 100644 tools/testing/selftests/bpf/progs/uprobe_multi_pid_filter.c diff --git a/tools/testing/selftests/bpf/prog_tests/uprobe_multi_test.c b/tools/testing/selftests/bpf/prog_tests/uprobe_multi_test.c index 250eb47c68f9..9c2f99233304 100644 --- a/tools/testing/selftests/bpf/prog_tests/uprobe_multi_test.c +++ b/tools/testing/selftests/bpf/prog_tests/uprobe_multi_test.c @@ -7,6 +7,7 @@ #include "uprobe_multi_bench.skel.h" #include "uprobe_multi_usdt.skel.h" #include "uprobe_multi_consumers.skel.h" +#include "uprobe_multi_pid_filter.skel.h" #include "bpf/libbpf_internal.h" #include "testing_helpers.h" #include "../sdt.h" @@ -935,6 +936,70 @@ static void test_consumers(void) uprobe_multi_consumers__destroy(skel); } +static struct bpf_program *uprobe_multi_program(struct uprobe_multi_pid_filter *skel, int idx) +{ + switch (idx) { + case 0: return skel->progs.uprobe_multi_0; + case 1: return skel->progs.uprobe_multi_1; + case 2: return skel->progs.uprobe_multi_2; + } + return NULL; +} + +#define TASKS 3 + +static void run_pid_filter(struct uprobe_multi_pid_filter *skel, bool retprobe) +{ + LIBBPF_OPTS(bpf_uprobe_multi_opts, opts, .retprobe = retprobe); + struct bpf_link *link[TASKS] = {}; + struct child child[TASKS] = {}; + int i; + + memset(skel->bss->test, 0, sizeof(skel->bss->test)); + + for (i = 0; i < TASKS; i++) { + if (!ASSERT_OK(spawn_child(&child[i]), "spawn_child")) + goto cleanup; + skel->bss->pids[i] = child[i].pid; + } + + for (i = 0; i < TASKS; i++) { + link[i] = bpf_program__attach_uprobe_multi(uprobe_multi_program(skel, i), + child[i].pid, "/proc/self/exe", + "uprobe_multi_func_1", &opts); + if (!ASSERT_OK_PTR(link[i], "bpf_program__attach_uprobe_multi")) + goto cleanup; + } + + for (i = 0; i < TASKS; i++) + kick_child(&child[i]); + + for (i = 0; i < TASKS; i++) { + ASSERT_EQ(skel->bss->test[i][0], 1, "pid"); + ASSERT_EQ(skel->bss->test[i][1], 0, "unknown"); + } + +cleanup: + for (i = 0; i < TASKS; i++) + bpf_link__destroy(link[i]); + for (i = 0; i < TASKS; i++) + release_child(&child[i]); +} + +static void test_pid_filter_process(void) +{ + struct uprobe_multi_pid_filter *skel; + + skel = uprobe_multi_pid_filter__open_and_load(); + if (!ASSERT_OK_PTR(skel, "uprobe_multi_pid_filter__open_and_load")) + return; + + run_pid_filter(skel, false); + run_pid_filter(skel, true); + + uprobe_multi_pid_filter__destroy(skel); +} + static void test_bench_attach_uprobe(void) { long attach_start_ns = 0, attach_end_ns = 0; @@ -1027,4 +1092,6 @@ void test_uprobe_multi_test(void) test_attach_uprobe_fails(); if (test__start_subtest("consumers")) test_consumers(); + if (test__start_subtest("filter_fork")) + test_pid_filter_process(); } diff --git a/tools/testing/selftests/bpf/progs/uprobe_multi_pid_filter.c b/tools/testing/selftests/bpf/progs/uprobe_multi_pid_filter.c new file mode 100644 index 000000000000..67fcbad36661 --- /dev/null +++ b/tools/testing/selftests/bpf/progs/uprobe_multi_pid_filter.c @@ -0,0 +1,40 @@ +// SPDX-License-Identifier: GPL-2.0 +#include "vmlinux.h" +#include +#include + +char _license[] SEC("license") = "GPL"; + +__u32 pids[3]; +__u32 test[3][2]; + +static void update_pid(int idx) +{ + __u32 pid = bpf_get_current_pid_tgid() >> 32; + + if (pid == pids[idx]) + test[idx][0]++; + else + test[idx][1]++; +} + +SEC("uprobe.multi") +int uprobe_multi_0(struct pt_regs *ctx) +{ + update_pid(0); + return 0; +} + +SEC("uprobe.multi") +int uprobe_multi_1(struct pt_regs *ctx) +{ + update_pid(1); + return 0; +} + +SEC("uprobe.multi") +int uprobe_multi_2(struct pt_regs *ctx) +{ + update_pid(2); + return 0; +}