From nobody Thu Apr 2 18:59:13 2026 Received: from out-172.mta1.migadu.com (out-172.mta1.migadu.com [95.215.58.172]) (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 5CF5D36BCDA for ; Mon, 23 Feb 2026 19:11:35 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=95.215.58.172 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1771873896; cv=none; b=UkGUD6jrBT39jEcqEN87E690jh4j0/NUoWDqQShJBefoUAItxAM05EWkXATwxBJQNBOTtwcpN9WUs1P2PSZ88VrOHYyX2+wl9QK2BZCYQSWLMmLgHiv5g+Hd/Bico+u1BBPN7B2Af4CsJyYEwiZt4/LcRYGQugaP4++YE+uqrXA= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1771873896; c=relaxed/simple; bh=OhwXEJpa4nTUiXqwkxQqB+DAIjkR6dlqqn333NLbtts=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=lwJvUMaOpS9nx3QqzoFwtPeEabEPeQYzNy4FgVdLczWNM/9hVwQukrEqQ4K0uw2x9EsKPFMnlMu2STQHOCr2VG0Z5Gc2RLfBcO3WeBV69zisWVRj8BMB0oqYOV+MDJqFJWpfiyuQdclww1qgn6TtUjpTfPL9WeylNn/NwbuQNsU= 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=K+sgaV8/; arc=none smtp.client-ip=95.215.58.172 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="K+sgaV8/" 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=1771873893; 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=TB4ypzf99oYRqj7vX8THS7uO7MYjSRJ+wJRwvR9VB+Y=; b=K+sgaV8/fqQewMJil/xshDxgMEIZvg6LZ1iSYo3mumXVqZypHDu1/i2p5hC0kLFW3I0ELI SOT6o8cEtK0NF1zL00iWjc/br9cyUfgNgaKfu+AVAprAGG/gL7AUQmDM1LoSJNt/qhBwlE oW58uUPqcQOrfJdZP73AxDRydaW9CH8= From: Ihor Solodrai To: Alexei Starovoitov , Andrii Nakryiko , Daniel Borkmann , Eduard Zingerman , Jiri Olsa , Mykyta Yatsenko , =?UTF-8?q?Alexis=20Lothor=C3=A9?= Cc: Amery Hung , bpf@vger.kernel.org, linux-kernel@vger.kernel.org, kernel-team@meta.com Subject: [PATCH bpf v4 18/20] selftests/bpf: Fix out-of-bounds array access bugs reported by ASAN Date: Mon, 23 Feb 2026 11:11:16 -0800 Message-ID: <20260223191118.655185-1-ihor.solodrai@linux.dev> In-Reply-To: <20260223190736.649171-1-ihor.solodrai@linux.dev> References: <20260223190736.649171-1-ihor.solodrai@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: quoted-printable X-Migadu-Flow: FLOW_OUT Content-Type: text/plain; charset="utf-8" - kmem_cache_iter: remove unnecessary debug output - lwt_seg6local: change the type of foobar to char[] - the sizeof(foobar) returned the pointer size and not a string length as intended - verifier_log: increase prog_name buffer size in verif_log_subtest() - compiler has a conservative estimate of fixed_log_sz value, making ASAN complain on snprint() call Acked-by: Eduard Zingerman Signed-off-by: Ihor Solodrai --- tools/testing/selftests/bpf/prog_tests/kmem_cache_iter.c | 7 ++----- tools/testing/selftests/bpf/prog_tests/lwt_seg6local.c | 2 +- tools/testing/selftests/bpf/prog_tests/verifier_log.c | 2 +- 3 files changed, 4 insertions(+), 7 deletions(-) diff --git a/tools/testing/selftests/bpf/prog_tests/kmem_cache_iter.c b/too= ls/testing/selftests/bpf/prog_tests/kmem_cache_iter.c index 6e35e13c2022..399fe9103f83 100644 --- a/tools/testing/selftests/bpf/prog_tests/kmem_cache_iter.c +++ b/tools/testing/selftests/bpf/prog_tests/kmem_cache_iter.c @@ -104,11 +104,8 @@ void test_kmem_cache_iter(void) if (!ASSERT_GE(iter_fd, 0, "iter_create")) goto destroy; =20 - memset(buf, 0, sizeof(buf)); - while (read(iter_fd, buf, sizeof(buf)) > 0) { - /* Read out all contents */ - printf("%s", buf); - } + while (read(iter_fd, buf, sizeof(buf)) > 0) + ; /* Read out all contents */ =20 /* Next reads should return 0 */ ASSERT_EQ(read(iter_fd, buf, sizeof(buf)), 0, "read"); diff --git a/tools/testing/selftests/bpf/prog_tests/lwt_seg6local.c b/tools= /testing/selftests/bpf/prog_tests/lwt_seg6local.c index 3bc730b7c7fa..1b25d5c5f8fb 100644 --- a/tools/testing/selftests/bpf/prog_tests/lwt_seg6local.c +++ b/tools/testing/selftests/bpf/prog_tests/lwt_seg6local.c @@ -117,7 +117,7 @@ void test_lwt_seg6local(void) const char *ns1 =3D NETNS_BASE "1"; const char *ns6 =3D NETNS_BASE "6"; struct nstoken *nstoken =3D NULL; - const char *foobar =3D "foobar"; + const char foobar[] =3D "foobar"; ssize_t bytes; int sfd, cfd; char buf[7]; diff --git a/tools/testing/selftests/bpf/prog_tests/verifier_log.c b/tools/= testing/selftests/bpf/prog_tests/verifier_log.c index 8337c6bc5b95..aaa2854974c0 100644 --- a/tools/testing/selftests/bpf/prog_tests/verifier_log.c +++ b/tools/testing/selftests/bpf/prog_tests/verifier_log.c @@ -47,7 +47,7 @@ static int load_prog(struct bpf_prog_load_opts *opts, boo= l expect_load_error) static void verif_log_subtest(const char *name, bool expect_load_error, in= t log_level) { LIBBPF_OPTS(bpf_prog_load_opts, opts); - char *exp_log, prog_name[16], op_name[32]; + char *exp_log, prog_name[24], op_name[32]; struct test_log_buf *skel; struct bpf_program *prog; size_t fixed_log_sz; --=20 2.53.0