From patchwork Thu Aug 29 19:45:05 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jiri Olsa X-Patchwork-Id: 13783785 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 77CDD1BD002; Thu, 29 Aug 2024 19:45:39 +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=1724960739; cv=none; b=IqeNFdEHP2jNnhFuaA7LK7OIp8l/f2h0nxmq8OWzNeSemh1IC0sVhV13hsvHmdn7MUgmyKWictRvy0QIV1JoftQ4dIl3RUPUkgxqcEaF6dYz7hjSzIxjdtcQJqzvTcne5+ePE7zt4zldwdXT6YDORcEZseZ4zU7jLCtgTF4Nm+o= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724960739; c=relaxed/simple; bh=hsofY5mS1ng3aVwCqPdHOCoXxhZ1oo3tDrHGXnPOec0=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=mqga9d3g8vokRm4jTShWwzT6GLOM2Mfx30m2a7ichdnt4gdb0Ls08EAvqTjstwFZ8PifQjZhhyC2am8FzhhysFFQAfLug+20kaUypJJxyItd1JFHp8E9CP6ENf9WdHIy/OQO6qu1vqcdW6RuZbdkWsmaTrwBF0iY4/+iQNy4iJg= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=ekz2nSD0; 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="ekz2nSD0" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2295FC4CEC1; Thu, 29 Aug 2024 19:45:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1724960739; bh=hsofY5mS1ng3aVwCqPdHOCoXxhZ1oo3tDrHGXnPOec0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ekz2nSD0y7N2VWg2f1ezpLD5FwXmLI9Pl4JxxykMIVap5B8Zbc+W7IY0jHRd28g0u 2G0IAPSyDAzIWAMTC2OXbZiWHiKXdQP+4+NlxpPUj19zBYIBLEfa2F3JpnmdLcPD+m nwVTck/6ckwm2QE9t+A7pjU7EZCvzcPSVryUyU0WJHrb+rTcez8wHrZ8DVu2t0N5tH Qw+DCQOqAwd0n66ysJjPrQqFlwn9B+J/DClk/QJ8Y2aF+9pcOapwp8RoO26ya47lr+ BZ5sjKL8pvQ3foVQGRQ94AUM8GJUTWRIUsJlvkBX3yLJ2Ao4PEbY4a1iVWKuEZzK49 fA8qudoJP/eMw== 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: [PATCH bpf-next 2/2] selftests/bpf: Add uprobe pid filter test for multiple processes Date: Thu, 29 Aug 2024 21:45:05 +0200 Message-ID: <20240829194505.402807-3-jolsa@kernel.org> X-Mailer: git-send-email 2.46.0 In-Reply-To: <20240829194505.402807-1-jolsa@kernel.org> References: <20240829194505.402807-1-jolsa@kernel.org> Precedence: bulk X-Mailing-List: linux-trace-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 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 | 103 ++++++++++++++++++ .../bpf/progs/uprobe_multi_pid_filter.c | 61 +++++++++++ 2 files changed, 164 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..59c460675af9 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 +936,106 @@ static void test_consumers(void) uprobe_multi_consumers__destroy(skel); } +typedef struct bpf_link *(create_link_t)(struct uprobe_multi_pid_filter *, int, int, bool); + +static struct bpf_program *uprobe_program(struct uprobe_multi_pid_filter *skel, int idx) +{ + switch (idx) { + case 0: return skel->progs.uprobe_0; + case 1: return skel->progs.uprobe_1; + case 2: return skel->progs.uprobe_2; + } + return NULL; +} + +static struct bpf_link *create_link_uprobe(struct uprobe_multi_pid_filter *skel, + int idx, int pid, bool retprobe) +{ + LIBBPF_OPTS(bpf_uprobe_opts, opts, + .retprobe = retprobe, + .func_name = "uprobe_multi_func_1", + ); + + return bpf_program__attach_uprobe_opts(uprobe_program(skel, idx), pid, + "/proc/self/exe", 0, &opts); +} + +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; +} + +static struct bpf_link *create_link_uprobe_multi(struct uprobe_multi_pid_filter *skel, + int idx, int pid, bool retprobe) +{ + LIBBPF_OPTS(bpf_uprobe_multi_opts, opts, .retprobe = retprobe); + + return bpf_program__attach_uprobe_multi(uprobe_multi_program(skel, idx), pid, + "/proc/self/exe", "uprobe_multi_func_1", &opts); +} + +#define TASKS 3 + +static void run_pid_filter(struct uprobe_multi_pid_filter *skel, + create_link_t create_link, bool retprobe) +{ + struct bpf_link *link[TASKS] = {}; + struct child child[TASKS] = {}; + int i; + + printf("%s retprobe %d\n", create_link == create_link_uprobe ? "uprobe" : "uprobe_multi", + retprobe); + + 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] = create_link(skel, i, child[i].pid, retprobe); + if (!ASSERT_OK_PTR(link[i], "create_link")) + 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, create_link_uprobe, false); + run_pid_filter(skel, create_link_uprobe, true); + run_pid_filter(skel, create_link_uprobe_multi, false); + run_pid_filter(skel, create_link_uprobe_multi, 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 +1128,6 @@ void test_uprobe_multi_test(void) test_attach_uprobe_fails(); if (test__start_subtest("consumers")) test_consumers(); + if (test__start_subtest("filter_process")) + 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..260d46406e47 --- /dev/null +++ b/tools/testing/selftests/bpf/progs/uprobe_multi_pid_filter.c @@ -0,0 +1,61 @@ +// 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; +} + +SEC("uprobe") +int uprobe_0(struct pt_regs *ctx) +{ + update_pid(0); + return 0; +} + +SEC("uprobe") +int uprobe_1(struct pt_regs *ctx) +{ + update_pid(1); + return 0; +} + +SEC("uprobe") +int uprobe_2(struct pt_regs *ctx) +{ + update_pid(2); + return 0; +}