From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="JkHX4tt2" Received: from mail-lf1-x12e.google.com (mail-lf1-x12e.google.com [IPv6:2a00:1450:4864:20::12e]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 45FD1A6 for ; Tue, 12 Dec 2023 11:58:16 -0800 (PST) Received: by mail-lf1-x12e.google.com with SMTP id 2adb3069b0e04-50be24167efso7054429e87.3 for ; Tue, 12 Dec 2023 11:58:16 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1702411094; x=1703015894; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=d2QShfNMYTNkQiMpYuhiBqh+otMqXVhziiw2LYCI+tI=; b=JkHX4tt2sczvcv1VqNpf9MekXsni/d9yS9VceVhTicjklZtaOPwL5HHD7WhwbcQhqS iZ+dpP971Z0iDTN31zrDBKTSHbiiHcHUXS9lRagRujKewYWMVG7skoVpcsqaaPePwf/i fEZjHVqRDYBoz+XSnk6XmyvGZG94QYH9l4Q+Wijngq7wjlp6O5VQbWJvrKjCdCJ+qh/m vDw/11rpitCa4G6p5sdGcLZzobNFByuAgZHxvfv8n4HKhkizOJC4nzZAyuwItXHgWKLw ZYPENCSDEsgdZuaIBng0GMDMUcyZCffAUPqiBZxh2h1xXODiXq6cvrderM8unDy8WsJa mRuw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1702411094; x=1703015894; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=d2QShfNMYTNkQiMpYuhiBqh+otMqXVhziiw2LYCI+tI=; b=XdozCfiJj9vKeH+eJHxmnfUfFF6urw3L2gaD7fQjmhkSXnh2kGvhU8NVabyx+3CHSk 0fDvg6MWIvUrUEcftCr5GcvBTlMa4LGRFgHZo9Xc7qrg9NSb2nzd8NPN1QQuZiGqisnh SiEk6HlW3RdRP5I+hMw2aYznr0XwcsHQUVMpQ6drxcWC3wshfczsAHWm8XphaOjZItem Xh3YewY9yYZwRZ8rxaEPK39hpJN9FDYfK3xsG+bcqgtzBwMLLHDZ0b7ZiFLBDlgpLr4P rtCJpIupsXCj7XtTme/SYr96NCSeH6hXccGiLsLBKmPwzQd9SMmBzZttWdT0rGJ+L4gn q1Ug== X-Gm-Message-State: AOJu0YyLk2BNJltvd/KDblNRUUfbDeQe0tdJ7HPXZYmo/lgiOZLtPi4k vG+/p75NoYeunUIeH3KiaX1HB9KVDdHGaQ== X-Google-Smtp-Source: AGHT+IH0yoSx2CHrJqLhrbxuuN3IZmvUpZISUIKaE74D55f+1qftaukjv7cwXS6uRAl8RkIELkcWZA== X-Received: by 2002:ac2:54a8:0:b0:50b:eadf:f173 with SMTP id w8-20020ac254a8000000b0050beadff173mr1300961lfk.73.1702411094263; Tue, 12 Dec 2023 11:58:14 -0800 (PST) Received: from localhost.localdomain ([2a00:20:608d:69b3:fa16:54ff:fe6e:2940]) by smtp.gmail.com with ESMTPSA id tm6-20020a170907c38600b00a1db955c809sm6677386ejc.73.2023.12.12.11.58.13 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 12 Dec 2023 11:58:13 -0800 (PST) From: Dmitrii Dolgov <9erthalion6@gmail.com> To: bpf@vger.kernel.org Cc: ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org, martin.lau@linux.dev, song@kernel.org, yonghong.song@linux.dev, dan.carpenter@linaro.org, olsajiri@gmail.com, asavkov@redhat.com, Dmitrii Dolgov <9erthalion6@gmail.com> Subject: [PATCH bpf-next v8 4/4] selftests/bpf: Test re-attachment fix for bpf_tracing_prog_attach Date: Tue, 12 Dec 2023 20:54:09 +0100 Message-ID: <20231212195413.23942-5-9erthalion6@gmail.com> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20231212195413.23942-1-9erthalion6@gmail.com> References: <20231212195413.23942-1-9erthalion6@gmail.com> Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Add a test case to verify the fix for "prog->aux->dst_trampoline and tgt_prog is NULL" branch in bpf_tracing_prog_attach. The sequence of events: 1. load rawtp program 2. load fentry program with rawtp as target_fd 3. create tracing link for fentry program with target_fd = 0 4. repeat 3 Signed-off-by: Dmitrii Dolgov <9erthalion6@gmail.com> --- Changes in v8: - Cleanup, remove link opts and if condition around assert for the expected error, unneeded parts of the test bpf prog and some indendation improvements. .../bpf/prog_tests/recursive_attach.c | 45 +++++++++++++++++++ .../bpf/progs/fentry_recursive_target.c | 10 +++++ 2 files changed, 55 insertions(+) diff --git a/tools/testing/selftests/bpf/prog_tests/recursive_attach.c b/tools/testing/selftests/bpf/prog_tests/recursive_attach.c index 5b38783bcd16..1063b7924343 100644 --- a/tools/testing/selftests/bpf/prog_tests/recursive_attach.c +++ b/tools/testing/selftests/bpf/prog_tests/recursive_attach.c @@ -66,3 +66,48 @@ void test_recursive_fentry_attach(void) fentry_recursive__destroy(tracing_chain[i]); } } + +/* + * Test that a tracing prog reattachment (when we land in + * "prog->aux->dst_trampoline and tgt_prog is NULL" branch in + * bpf_tracing_prog_attach) does not lead to a crash due to missing attach_btf + */ +void test_fentry_attach_btf_presence(void) +{ + struct fentry_recursive_target *target_skel = NULL; + struct fentry_recursive *tracing_skel = NULL; + struct bpf_program *prog; + int err, link_fd, tgt_prog_fd; + + target_skel = fentry_recursive_target__open_and_load(); + if (!ASSERT_OK_PTR(target_skel, "fentry_recursive_target__open_and_load")) + goto close_prog; + + tracing_skel = fentry_recursive__open(); + if (!ASSERT_OK_PTR(tracing_skel, "fentry_recursive__open")) + goto close_prog; + + prog = tracing_skel->progs.recursive_attach; + tgt_prog_fd = bpf_program__fd(target_skel->progs.fentry_target); + err = bpf_program__set_attach_target(prog, tgt_prog_fd, "fentry_target"); + if (!ASSERT_OK(err, "bpf_program__set_attach_target")) + goto close_prog; + + err = fentry_recursive__load(tracing_skel); + if (!ASSERT_OK(err, "fentry_recursive__load")) + goto close_prog; + + tgt_prog_fd = bpf_program__fd(tracing_skel->progs.recursive_attach); + link_fd = bpf_link_create(tgt_prog_fd, 0, BPF_TRACE_FENTRY, NULL); + if (!ASSERT_GE(link_fd, 0, "link_fd")) + goto close_prog; + + fentry_recursive__detach(tracing_skel); + + err = fentry_recursive__attach(tracing_skel); + ASSERT_ERR(err, "fentry_recursive__attach"); + +close_prog: + fentry_recursive_target__destroy(target_skel); + fentry_recursive__destroy(tracing_skel); +} diff --git a/tools/testing/selftests/bpf/progs/fentry_recursive_target.c b/tools/testing/selftests/bpf/progs/fentry_recursive_target.c index 6e0b5c716f8e..51af8426da3a 100644 --- a/tools/testing/selftests/bpf/progs/fentry_recursive_target.c +++ b/tools/testing/selftests/bpf/progs/fentry_recursive_target.c @@ -15,3 +15,13 @@ int BPF_PROG(test1, int a) { return 0; } + +/* + * Dummy bpf prog for testing attach_btf presence when attaching an fentry + * program. + */ +SEC("raw_tp/sys_enter") +int BPF_PROG(fentry_target, struct pt_regs *regs, long id) +{ + return 0; +} -- 2.41.0