From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from out-179.mta0.migadu.com (out-179.mta0.migadu.com [91.218.175.179]) (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 F1E333B3BE1 for ; Mon, 22 Jun 2026 14:38:25 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=91.218.175.179 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1782139108; cv=none; b=PAhitoX/NkwWzgOulEaTZZwuqmUjIRv0PWPlqY8RjBCPCmcklbuxXRaeudJiGDGyGHE1jTtkFtKY0zLhGqmhWSRN/bT7qoZoa945Amiel8uXIRQ3nnJ5fZPFbw6ioVMpt0LrMpSMXyk2Q+oAQQXUEXnfxz73OiSQp05Y9WrgMtY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1782139108; c=relaxed/simple; bh=k5ztgXjyH2GDbXXyA2xUsORRkWUozVJfGvu0SpgqIl4=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=KOwMURTqiB6oL8aOPqYSksYiMZROJkQxTnjAkaN/IpPto0pvfFGAKZx1cixtr+eBL0r+Niahlg+8WM4D0g2n/tKL/okqhKCM8P1Y5fgRTSDWfvaBWGYUphlA0Zlbxs47opjrRQ9g7wjGBCz9lyyvdOus+lrtwxYmfxcdD/EiTWE= 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=gG+8UUkb; arc=none smtp.client-ip=91.218.175.179 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="gG+8UUkb" 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=1782139103; 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=30dXQAh3Rbv5muJHoTPKyMD8bLBAM+/VUDQA6uzCiDA=; b=gG+8UUkbJncXHfUcgAA4ImouzqoQ2EDe/nB3Wbyv2JbAwDX+3sH/RZhO+THP+1AwO8T/3x 8UqpS/n0iRoC9/bLtBqvwd3y3IT/NrcS31J8SCLMngLck0pa/m+MCYZlGV5BXgob0hhIVT /ypASjqDangEPAX+Zn8XamKg9YRvgdI= 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 v7 10/11] selftests/bpf: Add tests to verify verifier log for global percpu data Date: Mon, 22 Jun 2026 22:35:56 +0800 Message-ID: <20260622143557.22955-11-leon.hwang@linux.dev> In-Reply-To: <20260622143557.22955-1-leon.hwang@linux.dev> References: <20260622143557.22955-1-leon.hwang@linux.dev> Precedence: bulk X-Mailing-List: bpf@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 f59d83919058..e4c290492ff8 100644 --- a/tools/testing/selftests/bpf/prog_tests/global_data_init.c +++ b/tools/testing/selftests/bpf/prog_tests/global_data_init.c @@ -274,6 +274,11 @@ static void test_global_percpu_data_rdonly_direct_read(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)) { @@ -287,4 +292,5 @@ void test_global_percpu_data(void) test_global_percpu_data_lskel(); if (test__start_subtest("rdonly_direct_read")) test_global_percpu_data_rdonly_direct_read(); + 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