From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from out-187.mta1.migadu.com (out-187.mta1.migadu.com [95.215.58.187]) (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 532AD40BCC4 for ; Mon, 13 Jul 2026 15:41:29 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=95.215.58.187 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783957291; cv=none; b=uWCw2NDzApg5smkCwyGdpuwsP6IhDGw74xvyFspWFLzHijt+iQ3BrQOkpmUIA2cRAOa+gdtRoya6GijqV9YSY76dr+oSrOiZIh/IaYr4KNfZ/wIUphJII4gfipko7mvzVN0SgPYiZkbkw8GBYQ8HosfvcyWMsemMKusIoNLVFFE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783957291; c=relaxed/simple; bh=9VUVkuDLNQLapCOn23MphWt3JIcg5d8d10IFnq8dNtk=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=pbItMgFNwdwLG7xi6NlE3eM6VxubfDV27GlgYMta0qsv8Gl++8S71a9+mPS6XpqPzYEBE1hP0jl/FOkdThKhnSiiLJSfDjSCzsbH4h/6SHtHsMJKmfowLVn3S0ow/PMg4/nyAUKt3xdr1WvTPfVLCbHV5/Xy+i/W/LWa0jdU0lw= 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=iHUIyQ/Y; arc=none smtp.client-ip=95.215.58.187 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="iHUIyQ/Y" 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=1783957287; 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=KhEu73XdDjzOZKOTaznlKskzsmU22YqaUUFeK6qekak=; b=iHUIyQ/YWvN1Ys0DYhHctAaG/Zy21ZY/XmyMTRYeSzn2f5YNsv71buGiLV/dyyOse/mqIr 9IuzLFeT9kdLULmoU54E7CFNLMeWn3wmqScXcFbDP5RWpPSMZLW/agdhX9fHWrhNMs76Dw UnzYIIqxYl91tAHr1u1poXmHYQVS/Kw= 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 v9 8/9] selftests/bpf: Test verifier log for global percpu data Date: Mon, 13 Jul 2026 23:40:23 +0800 Message-ID: <20260713154024.30851-9-leon.hwang@linux.dev> In-Reply-To: <20260713154024.30851-1-leon.hwang@linux.dev> References: <20260713154024.30851-1-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 d4405646847a..598b7dde6581 100644 --- a/tools/testing/selftests/bpf/prog_tests/global_data_init.c +++ b/tools/testing/selftests/bpf/prog_tests/global_data_init.c @@ -278,6 +278,11 @@ 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)) { @@ -293,4 +298,5 @@ 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 54380dfb11a5..b852a0b07508 100644 --- a/tools/testing/selftests/bpf/progs/test_global_percpu_data.c +++ b/tools/testing/selftests/bpf/progs/test_global_percpu_data.c @@ -30,4 +30,27 @@ 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