From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 78412C433ED for ; Sat, 10 Apr 2021 11:30:36 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 41665610CD for ; Sat, 10 Apr 2021 11:30:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234180AbhDJLat (ORCPT ); Sat, 10 Apr 2021 07:30:49 -0400 Received: from out5-smtp.messagingengine.com ([66.111.4.29]:44001 "EHLO out5-smtp.messagingengine.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231279AbhDJLat (ORCPT ); Sat, 10 Apr 2021 07:30:49 -0400 Received: from compute4.internal (compute4.nyi.internal [10.202.2.44]) by mailout.nyi.internal (Postfix) with ESMTP id AB6F25C0109; Sat, 10 Apr 2021 07:30:34 -0400 (EDT) Received: from mailfrontend1 ([10.202.2.162]) by compute4.internal (MEProxy); Sat, 10 Apr 2021 07:30:34 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kroah.com; h= date:from:to:cc:subject:message-id:references:mime-version :content-type:in-reply-to; s=fm3; bh=YTCcS6TlCRRkwsAF7FqwhifD/vB TIXiE3hWM+5pNyjU=; b=D0SbLl8yzwsq+TKkDMgwYdg2QOW6jyOPeP+BVey12ZO kfSG6cM7UWWZ2iNTTb96/usdvlrgLtwVWCqQqT1TeWL+V0m0qvqzXIGC8hT1xh5g pSHo4ZWyycrG8KlME714xjtlXO7V4R8OoBMK+XMUIalU3wH1RG0I0iX8J6SxvLjf rW3AtwuaLhqZVE9sLSrF+QGlCODyw8di4tveCuqVpEcs+ftLyCGhM4eviYoVrwLQ xcat6sBSP4FiRYOkJLT8cGy6HDyHzi3KuR0mNibg2ervFcICc94sk5U5/oa40CrH FUVo7POvYIeOfxz998UdVsuvSwIRQzxLag+9MFJ7ZbA== DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d= messagingengine.com; h=cc:content-type:date:from:in-reply-to :message-id:mime-version:references:subject:to:x-me-proxy :x-me-proxy:x-me-sender:x-me-sender:x-sasl-enc; s=fm2; bh=YTCcS6 TlCRRkwsAF7FqwhifD/vBTIXiE3hWM+5pNyjU=; b=EywXAJNZXTHe/cZ/YteTsG 1vszJBqn1PhepTol/DAyCQigjwNSDqgCerKJmtQm/6lzqL+M2Ix9SCqUYXtcRVQt VUJZ9aZHxNcuitvC2krMLKf/WPdspckCWzZjVNcw5ctS9OQQdgap1SSRAV3GTNMs /C+i/tE1NRRakD+LnNarhj641Kxm9KcMVQnqRx72PkiZIR+tqBp0IhfnVK7CiulU OEwjkAhlK+hkFyspNdeSYtiLbWEKjt2mjIWyO8soUhW8huSJbnBV3Kt4UCAiRf/m PcdtcTfiUCJCuL3qDJ91ZSZN3DsSCJJ2YyAwcMY0JyjbrOfs8J8X0IPKxAZn8awg == X-ME-Sender: X-ME-Proxy-Cause: gggruggvucftvghtrhhoucdtuddrgeduledrudekfedggeduucetufdoteggodetrfdotf fvucfrrhhofhhilhgvmecuhfgrshhtofgrihhlpdfqfgfvpdfurfetoffkrfgpnffqhgen uceurghilhhouhhtmecufedttdenucenucfjughrpeffhffvuffkfhggtggujgesthdtre dttddtvdenucfhrhhomhepifhrvghgucfmjfcuoehgrhgvgheskhhrohgrhhdrtghomheq necuggftrfgrthhtvghrnhepveeuheejgfffgfeivddukedvkedtleelleeghfeljeeiue eggeevueduudekvdetnecukfhppeekfedrkeeirdejgedrieegnecuvehluhhsthgvrhfu ihiivgeptdenucfrrghrrghmpehmrghilhhfrhhomhepghhrvghgsehkrhhorghhrdgtoh hm X-ME-Proxy: Received: from localhost (83-86-74-64.cable.dynamic.v4.ziggo.nl [83.86.74.64]) by mail.messagingengine.com (Postfix) with ESMTPA id 4D04324005C; Sat, 10 Apr 2021 07:30:34 -0400 (EDT) Date: Sat, 10 Apr 2021 13:30:32 +0200 From: Greg KH To: "Zidenberg, Tsahi" Cc: stable@vger.kernel.org Subject: Re: [PATCH 0/2] fix userspace access on arm64 for linux 5.4 Message-ID: References: <56be4b97-8283-cf09-4dac-46d602cae97c@amazon.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <56be4b97-8283-cf09-4dac-46d602cae97c@amazon.com> Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org On Mon, Mar 29, 2021 at 01:56:53PM +0300, Zidenberg, Tsahi wrote: > > arm64 access to userspace addresses in bpf and kprobes is broken, > because kernelspace address accessors are always used, and won't work > for userspace. What does not work exactly? What is broken that is fixed in these changes? I can't seem to understand that as it feels like bpf and kprobes works on 5.4.y unless something broke it? confused, greg k-h