From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 2C6F450B433; Wed, 30 Sep 2026 16:38:11 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790786292; cv=none; b=Ar7XVGCsqO6emiyDSUNY6AZ9bZHDuew6ee2VO6PDygYWt05zW5tFTkBKLU4HWhXzmmYrUDmLrSmn7ahvqJimozNBKsWCiUIj05QolgblKInHfg1OtimO6mN3S3e3bS3VlV165B6wqd3d7CAnVMXqSykwJjOgywP+aF4D9OZrlhw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790786292; c=relaxed/simple; bh=+iAGRgKaTtkcninZnyfdJrAIwl54zYDu1Y64NilPP0I=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=P6T8dQCdP6R4vCvXr7/UXCfhPHMfkoNUOCcRnqsNmCVzM0ixK2bTWxgwKsqUdwNk6Opr1su91lkGsAr+SA0NFET9VlCNHfYnxX1mCf2v9rG6skzvwB5jcfP+YXfn4YKYlPMwprSiMhUv97DWyB4VTshVqIt5TlOfIJbC1Ustqg8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=fSzoOUVI; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="fSzoOUVI" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5B2161F000FF; Wed, 30 Sep 2026 16:38:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1790786290; bh=j3MOWG6snvTZdORDlon2tI385pG3an1A43JYkZVZ1PY=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=fSzoOUVIX44hBOYDC39bLXKvU4cacT8rYLKz5N+RejAhaSIWN5cO/MggAgv40r04H fWyNjCQ7hlXbasXSbLhk18eMNkPgRB8e3pOfCYi2vhudet67X/LLOL7RT8Gt+rJWUA jcotK2J7bhYcqjDV+MdlYN3qutzTzwuUg6RfCa1Q= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Chengming Zhou , Feng Zhou , Alexei Starovoitov , Sasha Levin Subject: [PATCH 6.1 810/982] bpf: support access variable length array of integer type Date: Wed, 30 Sep 2026 17:25:46 +0200 Message-ID: <20260930152434.155276588@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260930152416.775402466@linuxfoundation.org> References: <20260930152416.775402466@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.1-stable review patch. If anyone has any objections, please let me know. ------------------ From: Feng Zhou [ Upstream commit 2569c7b8726fc06d946a4f999fb1be15b68f3f3c ] After this commit: bpf: Support variable length array in tracing programs (9c5f8a1008a1) Trace programs can access variable length array, but for structure type. This patch adds support for integer type. Example: Hook load_balance struct sched_domain { ... unsigned long span[]; } The access: sd->span[0]. Co-developed-by: Chengming Zhou Signed-off-by: Chengming Zhou Signed-off-by: Feng Zhou Link: https://lore.kernel.org/r/20230420032735.27760-2-zhoufeng.zf@bytedance.com Signed-off-by: Alexei Starovoitov Stable-dep-of: b0b3dc665296 ("bpf: Fix divide-by-zero in btf_struct_walk()") Signed-off-by: Sasha Levin --- kernel/bpf/btf.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/kernel/bpf/btf.c b/kernel/bpf/btf.c index 4fa37f58d97dd..2aa8afcebfce0 100644 --- a/kernel/bpf/btf.c +++ b/kernel/bpf/btf.c @@ -5626,11 +5626,13 @@ static int btf_struct_walk(struct bpf_verifier_log *log, const struct btf *btf, if (off < moff) goto error; - /* Only allow structure for now, can be relaxed for - * other types later. - */ + /* allow structure and integer */ t = btf_type_skip_modifiers(btf, array_elem->type, NULL); + + if (btf_type_is_int(t)) + return WALK_SCALAR; + if (!btf_type_is_struct(t)) goto error; -- 2.53.0