From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mta0.migadu.com (out-169.mta0.migadu.com [91.218.175.169]) (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 E8F2F43634E for ; Thu, 13 Aug 2026 15:25:10 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=91.218.175.169 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786634712; cv=none; b=WZLzMzlt7yTwc9VzoGSRRGKFro2oohVUwdj9dpQPmIDC6WHlF9sHWoPT4gyfJlB8uFRpCn80PEuwz8DVM4EJENfFrejeeQDFPC11iTXlEk+eqxOtdqJDW7C7nZB7J8HXFXgW5Pk87SYTvXFRUa39HRW1gJZ79FDJ7DcEpmZRyfo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786634712; c=relaxed/simple; bh=ugn5KW5d0MnDrXEms3ZV9ewV8YufdJ3J2dZdBo1FPRI=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=VDwbLCMpbuxcA17dGC95VOllfMZ5Dh2IWMShYNi/5Y3KZmLa656k/dtqER1iztG7GInC/s7nlXkj++Lgcl3d/kLzbONOCaTLZtxDo5kUtUoRga55mJC3YPtgGdS0dMTd07xT8ZkXobMDSqjqk7pcvLcKYlLS6iRigppnd2/SoFs= 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=xGlXLnoQ; arc=none smtp.client-ip=91.218.175.169 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="xGlXLnoQ" X-Envelope-To: linux-kernel@vger.kernel.org DKIM-Signature: a=rsa-sha256; bh=ugn5KW5d0MnDrXEms3ZV9ewV8YufdJ3J2dZdBo1FPRI=; c=simple/simple; d=linux.dev; h=from:to:subject:date:message-id:mime-version:content-type; s=key1; t=1786634709; v=1; x=1787239509; b=xGlXLnoQXXwfkcA3h4/hZVRyiDBuN3Fult+zpzD5Wbc2/0SttuVANKCvPZFTPfU4OIUPwHcd +I9TtGbL3694J4OCk/wWjV0UGSvvh+0vvwEShJUyFVqoZ0GMrdjNYLjWGoZJl01c4UFoct0pCkF AiEENlkiIzOjZR8sk0vIDouY= X-Envelope-To: linux-kernel@vger.kernel.org Received: from .linux.dev (117.20.149.103) by smtp.migadu.com with ESMTPS id fde2fdddc889e8f1; Thu, 13 Aug 2026 15:25:08 +0000 X-Migadu-Flow: FLOW_OUT 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, Emil Tsalapatis Subject: [PATCH bpf-next v12 09/10] selftests/bpf: Test verifier log for global percpu data Date: Thu, 13 Aug 2026 23:23:22 +0800 Message-ID: <20260813152324.97937-10-leon.hwang@linux.dev> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260813152324.97937-1-leon.hwang@linux.dev> References: <20260813152324.97937-1-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 Add two tests to verify the verifier log "R%d points to percpu_array map which cannot be used as const string\n". Reviewed-by: Emil Tsalapatis 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 9688b417a90b..d308ca3b3045 100644 --- a/tools/testing/selftests/bpf/prog_tests/global_data_init.c +++ b/tools/testing/selftests/bpf/prog_tests/global_data_init.c @@ -322,6 +322,11 @@ 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)) { @@ -337,4 +342,5 @@ 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 416841cd3569..d086e9417f9f 100644 --- a/tools/testing/selftests/bpf/progs/test_global_percpu_data.c +++ b/tools/testing/selftests/bpf/progs/test_global_percpu_data.c @@ -38,4 +38,27 @@ 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"; -- 2.55.0