From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from out-177.mta0.migadu.com (out-177.mta0.migadu.com [91.218.175.177]) (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 6DDD4426EDE for ; Mon, 29 Jun 2026 15:25:40 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=91.218.175.177 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1782746742; cv=none; b=HlhNbD9MkmPWne/QB1l4lnVR/rxLz8EEUrCH7bB4Z34AJ05axO0a0lDcz+W0gO6DUNf7WuyBi5xYgeYMR5N/GE+F7jmPVTlvJ4xqndR9lJU3HcDZW/uvzBOwJe94OkVtn61LHUIohkKobg3o5JFFhE/78EDnLoxZeSzYYVW30VQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1782746742; c=relaxed/simple; bh=iTwEflDepro89UK/b2zpjODOIwwJJlKaoa5b9r/LkN4=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Esogv5OjsEvGCP5Bf4oswA8WKXO5jSZ+db/f/xD6yz/jqN0/0tXaSOg1oxgw/qtqYwqq9oTOKfb+8wOzzG2XzGO2PEtVA0Y1JV4pPkXSEWZOVlf2TPoA5t3vauiBTgVyFk/2ESp0jvrOrL0ZMtkK6vgAUzVLcuDboB5mq4PBlzY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev; spf=pass smtp.mailfrom=linux.dev; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b=nFsGu6xR; arc=none smtp.client-ip=91.218.175.177 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.dev Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b="nFsGu6xR" X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1782746738; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=yuAQ06FuIyEVSzaphY0QDpFCXgEtdJ9kinIOp9l/X4c=; b=nFsGu6xRyYQ9FnNtg7MPcaWAVhOfq5gDMI1BBzWiMDH/QsCSdyFBZan+BbQZN2p+/OfU8Q Ow6R1X1mUizUBprFq66a+gIvVgkyGZPjeiSddps3zsCu2CLpoJvQNoM/DOldQP3AAaT67Q hLeMYpfmd2/r3KIllqSWgyDP/UjO018= From: Leon Hwang To: bpf@vger.kernel.org Cc: Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Martin KaFai Lau , Eduard Zingerman , Kumar Kartikeya Dwivedi , Song Liu , Yonghong Song , Jiri Olsa , John Fastabend , Quentin Monnet , Shuah Khan , Leon Hwang , linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, kernel-patches-bot@fb.com Subject: [PATCH bpf-next v8 8/9] selftests/bpf: Test verifier log for global percpu data Date: Mon, 29 Jun 2026 23:24:05 +0800 Message-ID: <20260629152406.52582-9-leon.hwang@linux.dev> In-Reply-To: <20260629152406.52582-1-leon.hwang@linux.dev> References: <20260629152406.52582-1-leon.hwang@linux.dev> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Migadu-Flow: FLOW_OUT Add two tests to verify the verifier log "R%d points to percpu_array map which cannot be used as const string\n". Signed-off-by: Leon Hwang --- .../bpf/prog_tests/global_data_init.c | 6 +++++ .../bpf/progs/test_global_percpu_data.c | 23 +++++++++++++++++++ 2 files changed, 29 insertions(+) diff --git a/tools/testing/selftests/bpf/prog_tests/global_data_init.c b/tools/testing/selftests/bpf/prog_tests/global_data_init.c index 4f9eff36d856..ed085e2eb956 100644 --- a/tools/testing/selftests/bpf/prog_tests/global_data_init.c +++ b/tools/testing/selftests/bpf/prog_tests/global_data_init.c @@ -276,6 +276,11 @@ static void test_global_percpu_data_rdonly_direct_write(void) close(map_fd); } +static void test_global_percpu_data_verifier_log(void) +{ + RUN_TESTS(test_global_percpu_data); +} + void test_global_percpu_data(void) { if (!feat_supported(NULL, FEAT_PERCPU_DATA)) { @@ -291,4 +296,5 @@ void test_global_percpu_data(void) test_global_percpu_data_rdonly_direct_read(); if (test__start_subtest("rdonly_direct_write")) test_global_percpu_data_rdonly_direct_write(); + test_global_percpu_data_verifier_log(); } diff --git a/tools/testing/selftests/bpf/progs/test_global_percpu_data.c b/tools/testing/selftests/bpf/progs/test_global_percpu_data.c index ba92ffb0ca49..a6109e835948 100644 --- a/tools/testing/selftests/bpf/progs/test_global_percpu_data.c +++ b/tools/testing/selftests/bpf/progs/test_global_percpu_data.c @@ -28,4 +28,27 @@ int update_percpu_data(void *ctx) return 0; } +static const char fmt[] SEC(".percpu.fmt") = "data %d\n"; + +SEC("?kprobe") +__failure __msg("R{{[0-9]+}} points to percpu_array map which cannot be used as const string") +int verifier_strncmp(void *ctx) +{ + return bpf_strncmp("test", 5, fmt); +} + +SEC("?kprobe") +__failure __msg("R{{[0-9]+}} points to percpu_array map which cannot be used as const string") +int verifier_snprintf(void *ctx) +{ + u64 args[] = { data }; + char buf[128]; + int len; + + len = bpf_snprintf(buf, sizeof(buf), fmt, args, sizeof(args)); + if (len > 0) + bpf_printk("snprintf: %s\n", buf); + return 0; +} + char _license[] SEC("license") = "GPL"; -- 2.54.0