From nobody Sat Feb 7 08:02:20 2026 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 56294322A0C; Tue, 9 Sep 2025 12:39:52 +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=1757421592; cv=none; b=YM2ZwjYtI9F2Hf/KRWNjkn8lGe1NAvNu6V9pjN5TAbrML2pNAWWb785oik+U51ed57+TGulRonH6arPw7VfLBtT0y4whVfaXa0N02UJKfjpKn5YLgrcR1QW/Fy2LxEvs4HWCK815GMBVFHeWNFyQZw09KUs3uqVZZyu7A4ZlCJU= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1757421592; c=relaxed/simple; bh=AVpuHvvS5I5LtGxHyezfUbjP3WODclgFHrgBZgJ6/k0=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=V+ygXvmAEqdsllRehkH4g8yv6+MqqwbiShmQuH9USbIPzURF0x59c4hlBBJnjc86rkLiS4GPEdTGxP3eTbxuzTghfIDt3PLw2qI5bIiGwfNtYqgEI3JT4Bk213Y3tp6kIyrJffSduRFd1JQXAbliqrXn+szqD+9fXSFc7qg6q8M= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=bSbqfGNj; 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="bSbqfGNj" Received: by smtp.kernel.org (Postfix) with ESMTPSA id C35FBC4CEF4; Tue, 9 Sep 2025 12:39:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1757421591; bh=AVpuHvvS5I5LtGxHyezfUbjP3WODclgFHrgBZgJ6/k0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=bSbqfGNjVgnjBNay74JFJXdt4hR220qTaB+i61gQeMT7TCkPnRB7s9ORfSA8/zDKg UOGOD59ySe07cmQ2hfI3rCKhqdPQKCDj1P8+eIWHIKtOuQjmbeC0/LEdw+IH2wUmX5 qFrdZdZ7thC8KkpnBvSkeG4c0gCgs0tvHqtM5FB1kr5JPrH5BX0NqehL2dJ9hIiMup Ob7xS7hNm1KokVHidibVy0G86rzDgzvJmGM1QOL4Pyo3DCghqAQ2aCfh5P0bxzI5Jl XuC/kyRv4IERQe3wU0StBGGUVeUz+4n94bucFaFDGTQIM6eLrrpiyuv+4hMrcScEzW l0UAdGiU/butQ== 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: [PATCHv3 perf/core 4/6] selftests/bpf: Add uprobe context ip register change test Date: Tue, 9 Sep 2025 14:38:55 +0200 Message-ID: <20250909123857.315599-5-jolsa@kernel.org> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20250909123857.315599-1-jolsa@kernel.org> References: <20250909123857.315599-1-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