From patchwork Mon Sep 9 07:45:52 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jiri Olsa X-Patchwork-Id: 13796237 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 B63A717557C; Mon, 9 Sep 2024 07:46:59 +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=1725868019; cv=none; b=idSbegtJ3PksWeh/20OK944G5n80Exhi2ee0FZHjJ6EABIhEe9ovV+57SQBCTFCwslvMfRZctfHJrakQADD4aghj49ewrpUQAwOz8N9tSQaAXkhF8srKEOHTNRQwblqz27+3mV+wG/F/QBQgrL6LXG0E9bgtAQtVqu4Ty9+erR0= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725868019; c=relaxed/simple; bh=QcQ3tkDZArjXJxjIDoxxoCerB8p+FJ17FuuJb8viNQ4=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=tS+OWTfS3qnOUVdbLdGiUHxByQlXEHSeT+/agGPPaFmOudeROvajCc6kl2+LphcDblgBmD84xlQ8MqYjh0CKI8eYeOxgUkG2dR/+iQq+o97TrHdaEyvecRQFH26MNoQoDUPYlbfHL246uM/La0Axgbyb0HNjXF7duJXppPOA4wA= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=nzXho6Ro; 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="nzXho6Ro" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3A79DC4CEC5; Mon, 9 Sep 2024 07:46:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1725868019; bh=QcQ3tkDZArjXJxjIDoxxoCerB8p+FJ17FuuJb8viNQ4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=nzXho6RomaZfCKV/SgPWwiPuXU/mRLlVdiIzqb58hD4XolklxNAGHT6pqObQLUfX7 BI73maYTab2TYCuMMm+4EZZudOZ/4pjq7Rv5sr7fVFlhAMhjpcYPz3R2rRqVSt9Kqo 1tmEJnluVF8R/cYCM4fTBLgKULGkQ5+3doDcRPJHJCOPscn30rFOJTyJZsrn5n0D0z Kva2H5hwrxPmuZpP2WE/HYX/f9ydVAb+rO1x1o6JPRxoIgjQl2C3Mwco0JlVZYcpMr +posI2XBiU/PGP+mMRcB59GYyAn0E0N1+xJhyyUP6nm14oXkvNMAYMSoTGWzKWXXBp D70eYgTukeuaw== From: Jiri Olsa To: Oleg Nesterov , Peter Zijlstra , Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko Cc: bpf@vger.kernel.org, Martin KaFai Lau , Song Liu , Yonghong Song , John Fastabend , KP Singh , Stanislav Fomichev , Hao Luo , Steven Rostedt , Masami Hiramatsu , linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org Subject: [PATCHv3 5/7] selftests/bpf: Add uprobe session test Date: Mon, 9 Sep 2024 09:45:52 +0200 Message-ID: <20240909074554.2339984-6-jolsa@kernel.org> X-Mailer: git-send-email 2.46.0 In-Reply-To: <20240909074554.2339984-1-jolsa@kernel.org> References: <20240909074554.2339984-1-jolsa@kernel.org> Precedence: bulk X-Mailing-List: linux-trace-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Adding uprobe session test and testing that the entry program return value controls execution of the return probe program. Signed-off-by: Jiri Olsa Acked-by: Andrii Nakryiko --- .../bpf/prog_tests/uprobe_multi_test.c | 47 ++++++++++++ .../bpf/progs/uprobe_multi_session.c | 71 +++++++++++++++++++ 2 files changed, 118 insertions(+) create mode 100644 tools/testing/selftests/bpf/progs/uprobe_multi_session.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 bf6ca8e3eb13..cc32288bfe26 100644 --- a/tools/testing/selftests/bpf/prog_tests/uprobe_multi_test.c +++ b/tools/testing/selftests/bpf/prog_tests/uprobe_multi_test.c @@ -6,6 +6,7 @@ #include "uprobe_multi.skel.h" #include "uprobe_multi_bench.skel.h" #include "uprobe_multi_usdt.skel.h" +#include "uprobe_multi_session.skel.h" #include "bpf/libbpf_internal.h" #include "testing_helpers.h" #include "../sdt.h" @@ -615,6 +616,50 @@ static void test_link_api(void) __test_link_api(child); } +static void test_session_skel_api(void) +{ + struct uprobe_multi_session *skel = NULL; + LIBBPF_OPTS(bpf_kprobe_multi_opts, opts); + struct bpf_link *link = NULL; + int err; + + skel = uprobe_multi_session__open_and_load(); + if (!ASSERT_OK_PTR(skel, "uprobe_multi_session__open_and_load")) + goto cleanup; + + skel->bss->pid = getpid(); + skel->bss->user_ptr = test_data; + + err = uprobe_multi_session__attach(skel); + if (!ASSERT_OK(err, " uprobe_multi_session__attach")) + goto cleanup; + + /* trigger all probes */ + skel->bss->uprobe_multi_func_1_addr = (__u64) uprobe_multi_func_1; + skel->bss->uprobe_multi_func_2_addr = (__u64) uprobe_multi_func_2; + skel->bss->uprobe_multi_func_3_addr = (__u64) uprobe_multi_func_3; + + uprobe_multi_func_1(); + uprobe_multi_func_2(); + uprobe_multi_func_3(); + + /* + * We expect 2 for uprobe_multi_func_2 because it runs both entry/return probe, + * uprobe_multi_func_[13] run just the entry probe. All expected numbers are + * doubled, because we run extra test for sleepable session. + */ + ASSERT_EQ(skel->bss->uprobe_session_result[0], 2, "uprobe_multi_func_1_result"); + ASSERT_EQ(skel->bss->uprobe_session_result[1], 4, "uprobe_multi_func_2_result"); + ASSERT_EQ(skel->bss->uprobe_session_result[2], 2, "uprobe_multi_func_3_result"); + + /* We expect increase in 3 entry and 1 return session calls -> 4 */ + ASSERT_EQ(skel->bss->uprobe_multi_sleep_result, 4, "uprobe_multi_sleep_result"); + +cleanup: + bpf_link__destroy(link); + uprobe_multi_session__destroy(skel); +} + static void test_bench_attach_uprobe(void) { long attach_start_ns = 0, attach_end_ns = 0; @@ -703,4 +748,6 @@ void test_uprobe_multi_test(void) test_bench_attach_usdt(); if (test__start_subtest("attach_api_fails")) test_attach_api_fails(); + if (test__start_subtest("session")) + test_session_skel_api(); } diff --git a/tools/testing/selftests/bpf/progs/uprobe_multi_session.c b/tools/testing/selftests/bpf/progs/uprobe_multi_session.c new file mode 100644 index 000000000000..30bff90b68dc --- /dev/null +++ b/tools/testing/selftests/bpf/progs/uprobe_multi_session.c @@ -0,0 +1,71 @@ +// SPDX-License-Identifier: GPL-2.0 +#include +#include +#include +#include +#include "bpf_kfuncs.h" +#include "bpf_misc.h" + +char _license[] SEC("license") = "GPL"; + +__u64 uprobe_multi_func_1_addr = 0; +__u64 uprobe_multi_func_2_addr = 0; +__u64 uprobe_multi_func_3_addr = 0; + +__u64 uprobe_session_result[3] = {}; +__u64 uprobe_multi_sleep_result = 0; + +void *user_ptr = 0; +int pid = 0; + +static int uprobe_multi_check(void *ctx, bool is_return) +{ + const __u64 funcs[] = { + uprobe_multi_func_1_addr, + uprobe_multi_func_2_addr, + uprobe_multi_func_3_addr, + }; + unsigned int i; + __u64 addr; + + if (bpf_get_current_pid_tgid() >> 32 != pid) + return 1; + + addr = bpf_get_func_ip(ctx); + + for (i = 0; i < ARRAY_SIZE(funcs); i++) { + if (funcs[i] == addr) { + uprobe_session_result[i]++; + break; + } + } + + /* only uprobe_multi_func_2 executes return probe */ + if ((addr == uprobe_multi_func_1_addr) || + (addr == uprobe_multi_func_3_addr)) + return 1; + + return 0; +} + +SEC("uprobe.session//proc/self/exe:uprobe_multi_func_*") +int uprobe(struct pt_regs *ctx) +{ + return uprobe_multi_check(ctx, bpf_session_is_return()); +} + +static __always_inline bool verify_sleepable_user_copy(void) +{ + char data[9]; + + bpf_copy_from_user(data, sizeof(data), user_ptr); + return bpf_strncmp(data, sizeof(data), "test_data") == 0; +} + +SEC("uprobe.session.s//proc/self/exe:uprobe_multi_func_*") +int uprobe_sleepable(struct pt_regs *ctx) +{ + if (verify_sleepable_user_copy()) + uprobe_multi_sleep_result++; + return uprobe_multi_check(ctx, bpf_session_is_return()); +}