[PATCH v4.19] arm64: fix a concurrency issue in emulation_proc_handler()

[Jinjie Ruan]

On 2023/10/31 19:18, Greg KH wrote:
> On Mon, Oct 30, 2023 at 06:37:09AM +0000, Jinjie Ruan wrote:
>> In linux-6.1, the related code is refactored in commit 124c49b1b5d9
>> ("arm64: armv8_deprecated: rework deprected instruction handling") and this
>> issue was incidentally fixed. I have adapted the patch set to linux stable
>> 5.10. However, 4.19 and 5.10 are too different and the patch set is
>> hard to adapt to 4.19.
> 
> This is also needed for 5.4.y, right?  Now queued up for both.

Right! 5.4.y also need it. Thank you very much.

> 
> thanks,
> 
> greg k-h
> 
> From mboxrd at z Thu Jan  1 00:00:00 1970
> Return-Path: <linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org at lists.infradead.org>
> X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on
> 	aws-us-west-2-korg-lkml-1.web.codeaurora.org
> Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133])
> 	(using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits))
> 	(No client certificate requested)
> 	by smtp.lore.kernel.org (Postfix) with ESMTPS id 81AC2C4332F
> 	for <linux-arm-kernel at archiver.kernel.org>; Tue, 31 Oct 2023 11:19:01 +0000 (UTC)
> DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed;
> 	d=lists.infradead.org; s=bombadil.20210309; h=Sender:
> 	Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post:
> 	List-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References:
> 	Message-ID:Subject:Cc:To:From:Date:Reply-To:Content-ID:Content-Description:
> 	Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:
> 	List-Owner; bh=sHNb70g1HDu0TF54RigSJfYMEz5vBtgGnOr5JOh2HyQ=; b=iFgVKiA+IkzhII
> 	m4gw5nvcyNNhqjko8wsNMeG+gPyXUAkeZPfjW2w2erf+P6b4YZFQ0iuIwjDLzv/SBKpYa+vWmbv5E
> 	/TisXFYw7ISsR7nmNdQMmZWs5VVeGYO7MlP1u1/2Cw7EfSZ28ynjndjexd7fVHeKdB5R2ciVsWPVk
> 	n2v29BlvlRs7MfzHJ2JKYyd0JqFoGKTDPxQA5G2l3+aKt1p+5Ujqvv+adKlaU9ZO+qd/DErfcwATR
> 	BGvjbVo1uYIXyMXqoODe/dZW7BTcnC9WQb5cxnq3GUP2AzfEaStJEYNvX9e6DQKM89EfhU1EBLZMt
> 	e7MdaC4WSAweX4R63wQA==;
> Received: from localhost ([::1] helo=bombadil.infradead.org)
> 	by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux))
> 	id 1qxmlU-0059OC-1J;
> 	Tue, 31 Oct 2023 11:18:32 +0000
> Received: from ams.source.kernel.org ([145.40.68.75])
> 	by bombadil.infradead.org with esmtps (Exim 4.96 #2 (Red Hat Linux))
> 	id 1qxmlR-0059Ma-34
> 	for linux-arm-kernel at lists.infradead.org;
> 	Tue, 31 Oct 2023 11:18:31 +0000
> Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58])
> 	by ams.source.kernel.org (Postfix) with ESMTP id 8E876B810AC;
> 	Tue, 31 Oct 2023 11:18:21 +0000 (UTC)
> Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5E680C433C8;
> 	Tue, 31 Oct 2023 11:18:20 +0000 (UTC)
> DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org;
> 	s=korg; t=1698751100;
> 	bh=FrkgzgA5lVgOv9L7nzUu3Pnkn7b1h5ivphcK2rmy0/k=;
> 	h=Date:From:To:Cc:Subject:References:In-Reply-To:From;
> 	b=0SnFDTNYaKYCbdOzEos6VTDFSfwrsP68TOPQnm1RW6NlEHxCMLjW5JSmUoK5ya9Yn
> 	 wvsTROrz11Ki59JxvLNnYJdmRMpdVzi6WC2gjr3O2xq6Rd0NE5r/0OMIHmdM+ucQvJ
> 	 c0k+YQyEE43MNueByonhQ6Zw4tfdwPoxruNsrMr4=
> Date: Tue, 31 Oct 2023 12:18:17 +0100
> From: Greg KH <gregkh at linuxfoundation.org>
> To: Jinjie Ruan <ruanjinjie at huawei.com>
> Cc: catalin.marinas at arm.com, will.deacon at arm.com, mark.rutland at arm.com,
> 	linux-arm-kernel at lists.infradead.org, linux-kernel at vger.kernel.org
> Subject: Re: [PATCH v4.19] arm64: fix a concurrency issue in
>  emulation_proc_handler()
> Message-ID: <2023103103-revision-gigantic-cc05 at gregkh>
> References: <20231030063709.2443546-1-ruanjinjie at huawei.com>
> MIME-Version: 1.0
> Content-Disposition: inline
> In-Reply-To: <20231030063709.2443546-1-ruanjinjie at huawei.com>
> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 
> X-CRM114-CacheID: sfid-20231031_041830_159334_D1F4D83C 
> X-CRM114-Status: GOOD (  10.35  )
> X-BeenThere: linux-arm-kernel at lists.infradead.org
> X-Mailman-Version: 2.1.34
> Precedence: list
> List-Id: <linux-arm-kernel.lists.infradead.org>
> List-Unsubscribe: <http://lists.infradead.org/mailman/options/linux-arm-kernel>,
>  <mailto:linux-arm-kernel-request at lists.infradead.org?subject=unsubscribe>
> List-Archive: <http://lists.infradead.org/pipermail/linux-arm-kernel/>
> List-Post: <mailto:linux-arm-kernel at lists.infradead.org>
> List-Help: <mailto:linux-arm-kernel-request at lists.infradead.org?subject=help>
> List-Subscribe: <http://lists.infradead.org/mailman/listinfo/linux-arm-kernel>,
>  <mailto:linux-arm-kernel-request at lists.infradead.org?subject=subscribe>
> Content-Type: text/plain; charset="us-ascii"
> Content-Transfer-Encoding: 7bit
> Sender: "linux-arm-kernel" <linux-arm-kernel-bounces at lists.infradead.org>
> Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org at lists.infradead.org
> 
> On Mon, Oct 30, 2023 at 06:37:09AM +0000, Jinjie Ruan wrote:
>> In linux-6.1, the related code is refactored in commit 124c49b1b5d9
>> ("arm64: armv8_deprecated: rework deprected instruction handling") and this
>> issue was incidentally fixed. I have adapted the patch set to linux stable
>> 5.10. However, 4.19 and 5.10 are too different and the patch set is
>> hard to adapt to 4.19.
> 
> This is also needed for 5.4.y, right?  Now queued up for both.
> 
> thanks,
> 
> greg k-h
> 
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel at lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel