From nobody Thu Oct 2 23:48:28 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 022BB31FEE4; Tue, 16 Sep 2025 21:54:24 +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=1758059665; cv=none; b=fUbF49tFvcf5egjcNC/D4MmnxGqjmJNEVMGdAUSDibXIRw5IfyvU8M4lRAhHIlxTyAdhT6ZSCQYTzRBb3iFalzDopryYSir7i9p3/3KW1t5ShooSSrThNFPDDsnD7IsjyHxdc+jk71l4EWkSTPmGnv/K/hKLh/q4B3LtLk7gp3A= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1758059665; c=relaxed/simple; bh=OsEEWV4wNkbsvLkZHIBDGiDZBWoY4hQzlY0ncyYsXjw=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=h6WLUtw7vG45k+fJNLfRdkIhLiKE8QWv6GChW5moICC3lYe7KviSs9WUfen51qIfPb/pdZZYjiCze7B3LwQIJqg6BCOd4K2l1Gfcv5FbK/YGxpba1bPpSVg6/tIpUtJppjDN/BN+3Zni0ujIsA/oRltYG4TmXMDXj7Zk0Z2TmpY= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=iwBZCfP9; 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="iwBZCfP9" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2AD58C4CEF9; Tue, 16 Sep 2025 21:54:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1758059664; bh=OsEEWV4wNkbsvLkZHIBDGiDZBWoY4hQzlY0ncyYsXjw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=iwBZCfP9Ol3xjNu04Rpzhae7+ENY9bGrvTObrEij5MSNmeTI8QPz3y/DkglGNUUu5 BF9ziHp/vTpqq7PkLgh1XQej2UzJkcPiwZ7PfBOlD7Q806ETF+3DyidATmnfPLPhrR DWPcnutLhcYj8idhWF9F5B2o+QhLB8Y3kizSiwzRYNTC5s2k6nurAvIDYzW9TFMwb2 fV0U5eLCgsp/WSdVfqQsKBVvjH3BIUBOnWXLFXq5DNfprGlpyx6KQGvkNN2yLdQz1r FRaekHmI6ARNupz7C2RzW/KluTjcs9C4z3FsfDl5nkm+P+FbvBXeu6HU58IBkcxLhT DzRD0WQd25EYA== 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: [PATCHv4 bpf-next 6/6] selftests/bpf: Add kprobe multi write ctx attach test Date: Tue, 16 Sep 2025 23:53:01 +0200 Message-ID: <20250916215301.664963-7-jolsa@kernel.org> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20250916215301.664963-1-jolsa@kernel.org> References: <20250916215301.664963-1-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't attach kprobe multi program that writes to the context. It's x86_64 specific test. Acked-by: Andrii Nakryiko Signed-off-by: Jiri Olsa --- .../bpf/prog_tests/kprobe_multi_test.c | 27 +++++++++++++++++++ .../selftests/bpf/progs/kprobe_write_ctx.c | 7 +++++ 2 files changed, 34 insertions(+) diff --git a/tools/testing/selftests/bpf/prog_tests/kprobe_multi_test.c b/t= ools/testing/selftests/bpf/prog_tests/kprobe_multi_test.c index 171706e78da8..6cfaa978bc9a 100644 --- a/tools/testing/selftests/bpf/prog_tests/kprobe_multi_test.c +++ b/tools/testing/selftests/bpf/prog_tests/kprobe_multi_test.c @@ -7,6 +7,7 @@ #include "kprobe_multi_session.skel.h" #include "kprobe_multi_session_cookie.skel.h" #include "kprobe_multi_verifier.skel.h" +#include "kprobe_write_ctx.skel.h" #include "bpf/libbpf_internal.h" #include "bpf/hashmap.h" =20 @@ -539,6 +540,30 @@ static void test_attach_override(void) kprobe_multi_override__destroy(skel); } =20 +#ifdef __x86_64__ +static void test_attach_write_ctx(void) +{ + struct kprobe_write_ctx *skel =3D NULL; + struct bpf_link *link =3D NULL; + + skel =3D kprobe_write_ctx__open_and_load(); + if (!ASSERT_OK_PTR(skel, "kprobe_write_ctx__open_and_load")) + return; + + link =3D bpf_program__attach_kprobe_opts(skel->progs.kprobe_multi_write_c= tx, + "bpf_fentry_test1", NULL); + if (!ASSERT_ERR_PTR(link, "bpf_program__attach_kprobe_opts")) + bpf_link__destroy(link); + + kprobe_write_ctx__destroy(skel); +} +#else +static void test_attach_write_ctx(void) +{ + test__skip(); +} +#endif + void serial_test_kprobe_multi_bench_attach(void) { if (test__start_subtest("kernel")) @@ -578,5 +603,7 @@ void test_kprobe_multi_test(void) test_session_cookie_skel_api(); if (test__start_subtest("unique_match")) test_unique_match(); + if (test__start_subtest("attach_write_ctx")) + test_attach_write_ctx(); RUN_TESTS(kprobe_multi_verifier); } diff --git a/tools/testing/selftests/bpf/progs/kprobe_write_ctx.c b/tools/t= esting/selftests/bpf/progs/kprobe_write_ctx.c index 4621a5bef4e2..f77aef0474d3 100644 --- a/tools/testing/selftests/bpf/progs/kprobe_write_ctx.c +++ b/tools/testing/selftests/bpf/progs/kprobe_write_ctx.c @@ -12,4 +12,11 @@ int kprobe_write_ctx(struct pt_regs *ctx) ctx->ax =3D 0; return 0; } + +SEC("kprobe.multi") +int kprobe_multi_write_ctx(struct pt_regs *ctx) +{ + ctx->ax =3D 0; + return 0; +} #endif --=20 2.51.0