From nobody Thu Dec 18 06:21:57 2025 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 593942EBDE6; Mon, 8 Sep 2025 12:14:04 +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=1757333645; cv=none; b=CCaOjpp65qRPLumpmjGLOee5dARc5PEXNOYkIEPPTK7NpM83xMmzZlwY3Ynyor9MsORpoB4OB8J/GYxwPhkvj01MuJdJJ4w96OR8ol1N8TZfW7MUkKeien6OXYZ9g1XT2X0MFRaL5S8WCkdP6kIOnoSxjje0miihFUlUM/ytukc= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1757333645; c=relaxed/simple; bh=AVpuHvvS5I5LtGxHyezfUbjP3WODclgFHrgBZgJ6/k0=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=D4XZmZBVIvjM05joEz4w/uKX6asS5GCydaDlTQ5sv2Yy3gYz84XivwsyNJLl5axPDGvJ43yqKSFF4H9V2vjKBgfw23zzI1j5SVc1SdKsCoFHcpSZAknffjHRwi935JSzUlleDLBsWyox2mibnmMvWKKGTbZT8WPzcSg6eVKOqwM= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=uCiHGmfj; 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="uCiHGmfj" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 669AAC4CEF1; Mon, 8 Sep 2025 12:14:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1757333644; bh=AVpuHvvS5I5LtGxHyezfUbjP3WODclgFHrgBZgJ6/k0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=uCiHGmfj5qcNS6q95ZUcfPGpvi4/qMPuorzGgZf1w8GCpCGIBpOWY1bdW4mVIyaGk 1peA2Sg7Vp4mhpMtYcThMSfw6fCbbNDu+ZYf4dhusiL+c5LfIZLYZUFo/oOwvm6bLz qFzAjW9nkpZzu8p7JUo8YSRgSzQvZxC7yZ8JuRha5giMmGD2nXy3igrCFYAeHS3HcM u9JduVk0gO5Oef3RR+BLQq8mX6Z7YlfGVZR+PlNoFGs95bTfIQZTk5liQ3QIslIYzj zQR28s2jNDoUnhQglzCuvFLhHJExO0XSGNjPi6iK3oV1cshXFgiM82JzaQxJc01rzB w+qMEVKlqFnTQ== From: Jiri Olsa To: Oleg Nesterov , Masami Hiramatsu , Peter Zijlstra , Andrii Nakryiko Cc: bpf@vger.kernel.org, linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, x86@kernel.org, Song Liu , Yonghong Song , John Fastabend , Hao Luo , Steven Rostedt , Ingo Molnar Subject: [PATCHv2 perf/core 4/4] selftests/bpf: Add uprobe context ip register change test Date: Mon, 8 Sep 2025 14:13:10 +0200 Message-ID: <20250908121310.46824-5-jolsa@kernel.org> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20250908121310.46824-1-jolsa@kernel.org> References: <20250908121310.46824-1-jolsa@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Adding test to check we can change the application execution through instruction pointer change through uprobe program. It's x86_64 specific test. Signed-off-by: Jiri Olsa --- .../testing/selftests/bpf/prog_tests/uprobe.c | 42 +++++++++++++++++++ .../testing/selftests/bpf/progs/test_uprobe.c | 14 +++++++ 2 files changed, 56 insertions(+) diff --git a/tools/testing/selftests/bpf/prog_tests/uprobe.c b/tools/testin= g/selftests/bpf/prog_tests/uprobe.c index 19dd900df188..86404476c1da 100644 --- a/tools/testing/selftests/bpf/prog_tests/uprobe.c +++ b/tools/testing/selftests/bpf/prog_tests/uprobe.c @@ -190,10 +190,52 @@ static void regs_common(void) test_uprobe__destroy(skel); } =20 +static noinline unsigned long uprobe_regs_change_ip_1(void) +{ + return 0xc0ffee; +} + +static noinline unsigned long uprobe_regs_change_ip_2(void) +{ + return 0xdeadbeef; +} + +static void regs_ip(void) +{ + LIBBPF_OPTS(bpf_uprobe_opts, uprobe_opts); + struct test_uprobe *skel; + unsigned long ret; + + skel =3D test_uprobe__open_and_load(); + if (!ASSERT_OK_PTR(skel, "skel_open")) + return; + + skel->bss->my_pid =3D getpid(); + skel->bss->ip =3D (unsigned long) uprobe_regs_change_ip_2; + + uprobe_opts.func_name =3D "uprobe_regs_change_ip_1"; + skel->links.test_regs_change_ip =3D bpf_program__attach_uprobe_opts( + skel->progs.test_regs_change_ip, + -1, + "/proc/self/exe", + 0 /* offset */, + &uprobe_opts); + if (!ASSERT_OK_PTR(skel->links.test_regs_change_ip, "bpf_program__attach_= uprobe_opts")) + goto cleanup; + + ret =3D uprobe_regs_change_ip_1(); + ASSERT_EQ(ret, 0xdeadbeef, "ret"); + +cleanup: + test_uprobe__destroy(skel); +} + static void test_uprobe_regs_change(void) { if (test__start_subtest("regs_change_common")) regs_common(); + if (test__start_subtest("regs_change_ip")) + regs_ip(); } #else static void test_uprobe_regs_change(void) { } diff --git a/tools/testing/selftests/bpf/progs/test_uprobe.c b/tools/testin= g/selftests/bpf/progs/test_uprobe.c index 9437bd76a437..12f4065fca20 100644 --- a/tools/testing/selftests/bpf/progs/test_uprobe.c +++ b/tools/testing/selftests/bpf/progs/test_uprobe.c @@ -82,4 +82,18 @@ int BPF_UPROBE(test_regs_change) ctx->si =3D regs.si; return 0; } + +unsigned long ip; + +SEC("uprobe") +int BPF_UPROBE(test_regs_change_ip) +{ + pid_t pid =3D bpf_get_current_pid_tgid() >> 32; + + if (pid !=3D my_pid) + return 0; + + ctx->ip =3D ip; + return 0; +} #endif --=20 2.51.0