From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-wr1-f49.google.com (mail-wr1-f49.google.com [209.85.221.49]) (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 29CFF30595C for ; Sat, 23 May 2026 16:36:01 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.221.49 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779554162; cv=none; b=pbTWO/xpEYWIM7zUtC7cVD3GJI2fiQhJco66XcNmXvI4FaCRWZEl0P54HVL0zDt9vJBi2nPjGqybYgLKZ6vAr42M89AApZVfRH57e1c7oRO+ESHG/V5rROLg7s7MZXiaQerucoRoB1CZs+srSPDnojGXUx+DWo5tWF0g2AJYPxk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779554162; c=relaxed/simple; bh=SnLk0HaLAeDp9CB1O+cT5QTtRXJhfOlf8pVOAJpSIsI=; h=Date:From:To:Cc:Subject:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=HmqiTACty9agSPMEXU65vlWoXCwiJwUjW/QiETnKbW8P6bG9XgPa+N+BpzxkEo9z6cqVf08mOanfiv8DibJ8ccOWZvewJzZFZ/EAN5pQmjeQysW6JgW9QrWu7sKcGj/MFEn6/ET0YBSna4AbiKKJshf9gwOPXX3wB/LMBE2ieW8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=ns5JaW3q; arc=none smtp.client-ip=209.85.221.49 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="ns5JaW3q" Received: by mail-wr1-f49.google.com with SMTP id ffacd0b85a97d-444826c16ffso7296445f8f.1 for ; Sat, 23 May 2026 09:36:00 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20251104; t=1779554159; x=1780158959; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:subject:cc:to:from:date:from:to:cc:subject:date :message-id:reply-to; bh=Iqbi0SmV4l8cOiZU/jCD2RWz3CBg4dHUkTOED22sLyI=; b=ns5JaW3qxh1lKB1A1AMfQL/YNs5W71qvnoee8vLAr5LSlbmqX2Dqx/ltWDQ0JyqyQq j9Dyrhxwh+elQ1GwyrdeuUJ0eERgcDjdOIGbJ78IdpOsbkLY18/bJ4NlDgPuPnJclrlV IT4M8ixDjUtmC78JvcnUc0TZooSMJxLoKwDLeobqUeM5+CH0cc9ol1c0ntLESuS1H1Hb eEPuU+gpiJo7bagCd1eekOZIz/EU7Lt5ci9GXppLJqY2qCUBk7/qW5c6/QpMr/Rusbo7 p2QWaZwx5gO9PUHjRAzf0HEFly+cqoeLuBvDSkzfQErmOz/PoG2DHXu0ERATHhxuDCSh 2w0A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1779554159; x=1780158959; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:subject:cc:to:from:date:x-gm-gg:x-gm-message-state:from :to:cc:subject:date:message-id:reply-to; bh=Iqbi0SmV4l8cOiZU/jCD2RWz3CBg4dHUkTOED22sLyI=; b=GGFcCZ7eJMZnhA6lZW6pk+4ClR9wyS2fn4aWxt8wiTmziPWzr3fugln/hGiUQAld9C f998vxfpeKBclrlC2P3giwwmUxJb5BENq/0ByoXfpL2kstWPkwqci6SO7+YZpw11XHlk SBZfzneMyAEKo+sFviRrlCrbRVhYOV00hKNumhKmSATQQKNrGbaFqNVQ8VDT1dp+q8+M 9sazS6PMgRJwDvq8tT/hupREhmlsrK/uYcSOiL7gbCerBV2OUSxn1OUcdmjX76CFwJoF mVOvmQXw+tj7EbPq+1eYTIUDWd08GV22MF7H9ig10w/KU1n6ZD10hQin+W9bFnI26f4Y nymw== X-Forwarded-Encrypted: i=1; AFNElJ/H5CrZIWNkXblrV4H7fUEzgSM3384LgFk9Zw/Bn4I9QVwW13/FivOSRW2So3aOvWv8pNE=@vger.kernel.org X-Gm-Message-State: AOJu0YzjOsG2AsITjllQ2GAT5MugbI2bWqz1Ae6sFdUO4RUowTomon8G uOYKNzktIs3dl5Gpjch7kofYtI5/u4+x0wK+FQB/Rnas5TTSNvCDBs9G X-Gm-Gg: Acq92OGpa3LSYIzrEfYN/8/SM1lH8La6mklH2P5JhEzWwfV2Oje/KzVZBSbIoeW9Uvl 2ofXRDAMnslG06GhOb6oZlMLutOBgmoaMCuTEnv5x/nZ7Fw55ViNMKoqZbACZxTuYeT/7YBC+nG 0mAJCgl42P2Y7JI7bHFLe3gvAHLoHIzLY3iTM2N3gtmYtUoyr/si0g/JngHKEi5VIGRQIOunW+F Dc8EvNZCtdaxil1XbaanVMTepq8qUDFykIMJX0oxIGVfMkeIbHSe2GG74tg4xbUtyY+foYwODBI WD1UoNq5yzDIblGzMCTZ8tu9PNlwyeeAE0Jxt+2Y8yH7BGs/WXvcSz3KbIsaM3+/nSpnEvwtVtW MEShoZRVAqHpuxQyaVXOxtKuWsftimm2ecXr1mi+6gL6RoSVR5QeWFw6OehxCsudxLDzWHZY4uj LUwQ8CvLtQxObxuy1YhYUliywILKtRaxAf34oZ6KZCCwZsNGywGiryuKSsCqeF+9M6 X-Received: by 2002:a05:6000:29d3:b0:45d:3cbf:bdda with SMTP id ffacd0b85a97d-45eb38bb000mr9671985f8f.20.1779554159363; Sat, 23 May 2026 09:35:59 -0700 (PDT) Received: from pumpkin (82-69-66-36.dsl.in-addr.zen.co.uk. [82.69.66.36]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-45eb6d493dfsm13521078f8f.23.2026.05.23.09.35.58 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 23 May 2026 09:35:59 -0700 (PDT) Date: Sat, 23 May 2026 17:35:57 +0100 From: David Laight To: patchwork-bot+netdevbpf@kernel.org Cc: Stefano Garzarella , netdev@vger.kernel.org, xuanzhuo@linux.alibaba.com, horms@kernel.org, virtualization@lists.linux.dev, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, kuba@kernel.org, eperezma@redhat.com, pabeni@redhat.com, mst@redhat.com, davem@davemloft.net, jasowang@redhat.com, stefanha@redhat.com, edumazet@google.com, stable@vger.kernel.org Subject: Re: [PATCH net] vsock/virtio: fix skb overhead overflow on 32-bit builds Message-ID: <20260523173557.5cc4f4f6@pumpkin> In-Reply-To: <177950282964.1445071.6600517211632117224.git-patchwork-notify@kernel.org> References: <20260521124732.125771-1-sgarzare@redhat.com> <177950282964.1445071.6600517211632117224.git-patchwork-notify@kernel.org> X-Mailer: Claws Mail 4.1.1 (GTK 3.24.38; arm-unknown-linux-gnueabihf) Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit On Sat, 23 May 2026 02:20:29 +0000 patchwork-bot+netdevbpf@kernel.org wrote: > Hello: > > This patch was applied to netdev/net.git (main) > by Jakub Kicinski : Did anyone else notice that is isn't a bug? There is no way that a 'count of bytes of kernel memory' can overflow the size of 'long'. -- David > > On Thu, 21 May 2026 14:47:32 +0200 you wrote: > > From: Stefano Garzarella > > > > On 32-bit architectures, both skb_queue_len() and SKB_TRUESIZE(0) evaluate > > to 32-bit values. The multiplication can overflow before being assigned to > > the u64 skb_overhead variable, making the skb overhead check ineffective. > > > > Cast skb_queue_len() to u64 so the multiplication is always performed in > > 64-bit arithmetic. > > > > [...] > > Here is the summary with links: > - [net] vsock/virtio: fix skb overhead overflow on 32-bit builds > https://git.kernel.org/netdev/net/c/4157501b9a8f > > You are awesome, thank you!