From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 3667519CC0B; Tue, 1 Oct 2024 08:23:01 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1727770982; cv=none; b=r6N1VCVoInSudODTKYShma8Y5lVY5GG9xvrv2q+pQbH8p1Xqw7Vd9rtYx4dVrq3bAJwtTqf493yKS+zO2w5D8S5te7lygnZrbwzJ/Q15r7YnuMtOZ3trjB2i394N4giLLvi8f4piuNwTTxL3dEtn2ZVDArzU+Nr9s/Y7rtduWDs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1727770982; c=relaxed/simple; bh=AJJvr4rGsV2c+7hzHqkqiMcAUcBQt2wz2CkNKaAjmro=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=GPU14ynIcG3i2PelvKco1LbNrp7wLNy2D4ENlm7F7QfhJoUXTi0FB5BDIMA0NOa7VRrneO1zWoz+gW2mi8nPJaJLO6NgJMx8uHqCFVtm0pR/mvuT5GAK1gyOgQ3qWEbn+Z0JNlI/Z6vjeGyRpEY8hqQzBOqD7UbIJnsjTAzcgKg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=NTXJmIL0; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="NTXJmIL0" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 446BDC4CED2; Tue, 1 Oct 2024 08:23:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1727770981; bh=AJJvr4rGsV2c+7hzHqkqiMcAUcBQt2wz2CkNKaAjmro=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=NTXJmIL0HeNauSDQ4UQzSlxqyMHv4Pu7i1LiedJLY73hKT5pKKSuqq2f5Smpo3sk5 eGQSl0xlPRR3hLJn5YZJBMJXU/3mtvttdgtZ8rdnbfYQHNv7MxoKAqegq5FkcKofGn otkVd1Y05yWSA2YWNOUJnqblciuslbf+BniIRkIA= Date: Tue, 1 Oct 2024 10:22:51 +0200 From: Greg Kroah-Hartman To: Petr Mladek Cc: cve@kernel.org, linux-kernel@vger.kernel.org, linux-cve-announce@vger.kernel.org, Srikar Dronamraju , Nicholas Piggin , "Paul E. McKenney" , Tejun Heo , Sasha Levin , Michal Hocko , Michal =?iso-8859-1?Q?Koutn=FD?= Subject: Re: CVE-2024-46839: workqueue: Improve scalability of workqueue watchdog touch Message-ID: <2024100116-shaky-iguana-7f54@gregkh> References: <2024092754-CVE-2024-46839-cfab@gregkh> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: On Tue, Oct 01, 2024 at 10:02:02AM +0200, Petr Mladek wrote: > On Fri 2024-09-27 14:40:07, Greg Kroah-Hartman wrote: > > Description > > =========== > > > > In the Linux kernel, the following vulnerability has been resolved: > > > > workqueue: Improve scalability of workqueue watchdog touch > > > > On a ~2000 CPU powerpc system, hard lockups have been observed in the > > workqueue code when stop_machine runs (in this case due to CPU hotplug). > > I believe that this does not qualify as a security vulnerability. > Any hotplug is a privileged operation. Really? I see that happen on many embedded systems all the time, they add/remove CPUs while the device runs/sleeps constantly. Now to be fair, right now an "embedded system" usually doesn't have 2000 cpus, but what's wrong with marking this real bugfix as a vulnerability resolution? If you don't run your system in a way that allows cpus to be stopped unless an admin says so, it will not be relevant. thanks, greg k-h