From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-wm1-f42.google.com (mail-wm1-f42.google.com [209.85.128.42]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id BF53C3B8D78 for ; Mon, 30 Mar 2026 10:08:24 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.42 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774865306; cv=none; b=RzDUvweoLYxpHaZuHep/CFcPWmmN+6UTXBf+CDX4YjRFjj5avhh/w1r59qCy4c1IYH8inU8I+V0AjWEE1pORWnWqVi5Y227ZnY1JuqQUNysFa2qZJ++jQDQkss0Kvdeht2dXJz/PAgdwnwKz0+TZC+WiqqCLs8Mzw3cJmAYbuks= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774865306; c=relaxed/simple; bh=8wyx6aOB9/rpSUdWACqkfgV0FBEbAQZSWzjWclq3iEo=; h=From:Date:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=I8nfsHEg1sZikWmUa2fsyy/lqRdhnNnBggArma+b+4+tAs4sOC9X9cjcvyhIrQ5dkPJOBvNUazlwe7ZtWo6FzmgofDeSKWZf9N1ODaYjroxNHVdKIfiSvehHx9CdCQYgDqivfMgduGFYLzKXu+9ACITTBIrs3UUcHYfcdUb0V2c= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=okjGd268; arc=none smtp.client-ip=209.85.128.42 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="okjGd268" Received: by mail-wm1-f42.google.com with SMTP id 5b1f17b1804b1-48334ee0aeaso36476585e9.1 for ; Mon, 30 Mar 2026 03:08:24 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20251104; t=1774865303; x=1775470103; darn=vger.kernel.org; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:date:from:from:to:cc:subject:date:message-id:reply-to; bh=stE/M7chhz4+zdgyifRHBNEwU7WLtwKy5+xfo7bOcXE=; b=okjGd268/xpK3Vlrh/fAIaTaCc4v6f14Q3aA30zNZf1o+bjN1x5jI4Q7TG5lI+m/yt O7sNVW1vGlIbfKtYg4Eer1xTkMac11FzeXu7zqhwuTeCoS6A8coVhc2vduyrqVkmaL+Y UFk0uhqle+Moireiek+9J7Cs6qecnXTyRCaFiLkcg0UZgb36A+E2uGuxmQvAA3/evqN/ zIdHpTWHxqMkVzeybfQGU0rfLmuijh34lVY6IpZDHsiWqrmFkDJ/xmy/nYb9S1Jr2BDw HhP2bQDRdVnTtRSzmr0ddUvlQloIHnZx+vd4Ses+hZRCESUhZmlK/QzJ1/pDSZVRd81a OoZw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1774865303; x=1775470103; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:date:from:x-gm-gg:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=stE/M7chhz4+zdgyifRHBNEwU7WLtwKy5+xfo7bOcXE=; b=GTxVl8uwABZ32rj9oqJ2aYbmvN9EFquXcwTdwYP2yPVY7jp0M8M+hZMNsQXh7/OX3x ygYswm7IUDSKeteCAK6cw52Renkg/qxzhDEv/b5VHnD2JN7ipsIdRPsgYCe5XKQdQRr/ B26J5vTac5oEJrXVD3vKLnqOfFvF0rZu+5OoE/ZPW0IFjAFs64RgWevrOCxDPTw11Oex g/ZgizMa2rTD9SQhwIo7p9xAlQtMVFvDigDPNny8suczu+6n8rGHxewKGhntxA1MOHWi 5LYY0PO0O0WlZeX0Hm2jgwgtnJDuGj3b4ENk6YGLJNRwhWyc8FNSLRHaTOG0esnzXOwC cpsw== X-Forwarded-Encrypted: i=1; AJvYcCVD8mNbAsv0LUk5f3AICbH1YK8WEkCQSavQrqdl+ZeSwp/t6Wd6++IAPSzCR40zIDwrlq97hDWZoI5VT5mRXoU=@vger.kernel.org X-Gm-Message-State: AOJu0YxSiicrGTCv8wLs+KKluzbPtMmQBDH130V6ixzUhJAyeRaHGN/J wwZ3aig8Hjj8R4XBEmJIZau0iOOqrw8J41cqPhPwK9HH4M+wryS6Er67 X-Gm-Gg: ATEYQzwC5tazL56fvpgQdUT2i8qKBnBZfAi8rWYzVkPAfNP4jWhcewGbu/gw+AAK9Ju iXGEz8otDNc1m3SvfGCIrOt+/5U7aP+e6gn2XE6vFIkKqhelU62PUA5DSf8Vgelv+BWJiV21wfu D43vCnmmnJNA9VMqP2/kN5VSTE01KdJJ9Akb0FWtLNvTeyBpMQHuxtKz8sQpYEy9hVyvrBYd8ht qaWPa82UbB/IQ/KYprmCS6kZhWsvqVRuH/0IURMZ/zqvmiYkA4RbipVczPrhQ5DxIYy3CBZ3TXo 5ILbd6ZNuK/brQm9cs95AxPCbbl6FdAnzx8hM3kS10JItWKidBT/oklx3DjoqFYf6fsE1PXRFHm nJk7E9v7c94hSwXOvyspyDze2dNbIoAykWvwn/tAoknAXI0/wbggx7TuPLMNrxttd+jTCP452Hd SLa9xBZkE2wwrELU51uFo6jnAARAZYOCxT+Q8= X-Received: by 2002:a05:600c:a016:b0:483:64b4:79da with SMTP id 5b1f17b1804b1-48727ef153cmr186484445e9.26.1774865302883; Mon, 30 Mar 2026 03:08:22 -0700 (PDT) Received: from krava (37-188-160-213.red.o2.cz. [37.188.160.213]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-487270ea4bdsm132473095e9.6.2026.03.30.03.08.21 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 30 Mar 2026 03:08:22 -0700 (PDT) From: Jiri Olsa X-Google-Original-From: Jiri Olsa Date: Mon, 30 Mar 2026 12:08:20 +0200 To: Hoyeon Lee Cc: bpf@vger.kernel.org, Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Martin KaFai Lau , Eduard Zingerman , Kumar Kartikeya Dwivedi , Song Liu , Yonghong Song , Shuah Khan , Feng Yang , linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH bpf-next v2 2/2] selftests/bpf: add test for address-based single kprobe attach Message-ID: References: <20260329124429.689912-1-hoyeon.lee@suse.com> <20260329124429.689912-3-hoyeon.lee@suse.com> Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260329124429.689912-3-hoyeon.lee@suse.com> On Sun, Mar 29, 2026 at 09:43:39PM +0900, Hoyeon Lee wrote: > Currently, attach_probe covers manual single-kprobe attaches by > func_name, but not by raw address. This commit adds address-based > single-kprobe attach subtests for the two underlying attach paths, > legacy tracefs/debugfs and PMU-based non-legacy. The new subtests > resolve SYS_NANOSLEEP_KPROBE_NAME through kallsyms, pass the result > through bpf_kprobe_opts.addr, and verify that kprobe and kretprobe are > still triggered. > > Signed-off-by: Hoyeon Lee > --- > .../selftests/bpf/prog_tests/attach_probe.c | 49 +++++++++++++++++++ > 1 file changed, 49 insertions(+) > > diff --git a/tools/testing/selftests/bpf/prog_tests/attach_probe.c b/tools/testing/selftests/bpf/prog_tests/attach_probe.c > index 9e77e5da7097..64f2ed75779d 100644 > --- a/tools/testing/selftests/bpf/prog_tests/attach_probe.c > +++ b/tools/testing/selftests/bpf/prog_tests/attach_probe.c > @@ -123,6 +123,51 @@ static void test_attach_probe_manual(enum probe_attach_mode attach_mode) > test_attach_probe_manual__destroy(skel); > } > > +/* manual attach address-based kprobe/kretprobe testings */ > +static void test_attach_kprobe_by_addr(enum probe_attach_mode attach_mode) > +{ > + DECLARE_LIBBPF_OPTS(bpf_kprobe_opts, kprobe_opts); > + struct bpf_link *kprobe_link, *kretprobe_link; > + struct test_attach_probe_manual *skel; > + unsigned long func_addr; > + > + if (!ASSERT_OK(load_kallsyms(), "load_kallsyms")) > + return; > + > + func_addr = ksym_get_addr(SYS_NANOSLEEP_KPROBE_NAME); > + if (!ASSERT_NEQ(func_addr, 0UL, "func_addr")) > + return; > + > + skel = test_attach_probe_manual__open_and_load(); > + if (!ASSERT_OK_PTR(skel, "skel_kprobe_manual_open_and_load")) > + return; > + > + kprobe_opts.attach_mode = attach_mode; > + kprobe_opts.retprobe = false; > + kprobe_opts.addr = func_addr; > + kprobe_link = bpf_program__attach_kprobe_opts(skel->progs.handle_kprobe, > + NULL, &kprobe_opts); > + if (!ASSERT_OK_PTR(kprobe_link, "attach_kprobe_by_addr")) > + goto cleanup; > + skel->links.handle_kprobe = kprobe_link; we usually use skel->links.handle_kprobe directly, no need to use kprobe_link or kretprobe_link > + > + kprobe_opts.retprobe = true; > + kretprobe_link = bpf_program__attach_kprobe_opts(skel->progs.handle_kretprobe, > + NULL, &kprobe_opts); > + if (!ASSERT_OK_PTR(kretprobe_link, "attach_kretprobe_by_addr")) > + goto cleanup; > + skel->links.handle_kretprobe = kretprobe_link; > + > + /* trigger & validate kprobe && kretprobe */ > + usleep(1); > + > + ASSERT_EQ(skel->bss->kprobe_res, 1, "check_kprobe_res"); > + ASSERT_EQ(skel->bss->kretprobe_res, 2, "check_kretprobe_res"); > + > +cleanup: > + test_attach_probe_manual__destroy(skel); > +} > + > /* attach uprobe/uretprobe long event name testings */ > static void test_attach_uprobe_long_event_name(void) > { > @@ -416,6 +461,10 @@ void test_attach_probe(void) > test_attach_probe_manual(PROBE_ATTACH_MODE_PERF); > if (test__start_subtest("manual-link")) > test_attach_probe_manual(PROBE_ATTACH_MODE_LINK); > + if (test__start_subtest("kprobe-legacy-by-addr")) > + test_attach_kprobe_by_addr(PROBE_ATTACH_MODE_LEGACY); > + if (test__start_subtest("kprobe-perf-by-addr")) > + test_attach_kprobe_by_addr(PROBE_ATTACH_MODE_PERF); should we test PROBE_ATTACH_MODE_LINK mode as well? jirka > > if (test__start_subtest("auto")) > test_attach_probe_auto(skel); > -- > 2.52.0 >