From mboxrd@z Thu Jan 1 00:00:00 1970 From: Catalin Marinas Subject: Re: [PATCH v16 09/16] fs, arm64: untag user pointers in fs/userfaultfd.c Date: Wed, 12 Jun 2019 11:45:17 +0100 Message-ID: <20190612104517.GB28951@C02TF0J2HF1T.local> References: <7d6fef00d7daf647b5069101da8cf5a202da75b0.1559580831.git.andreyknvl@google.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <7d6fef00d7daf647b5069101da8cf5a202da75b0.1559580831.git.andreyknvl@google.com> Sender: linux-kernel-owner@vger.kernel.org To: Andrey Konovalov Cc: linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, linux-rdma@vger.kernel.org, linux-media@vger.kernel.org, kvm@vger.kernel.org, linux-kselftest@vger.kernel.org, Vincenzo Frascino , Will Deacon , Mark Rutland , Andrew Morton , Greg Kroah-Hartman , Kees Cook , Yishai Hadas , Felix Kuehling , Alexander Deucher , Christian Koenig , Mauro Carvalho Chehab , Jens Wiklander List-Id: linux-rdma@vger.kernel.org On Mon, Jun 03, 2019 at 06:55:11PM +0200, Andrey Konovalov wrote: > This patch is a part of a series that extends arm64 kernel ABI to allow to > pass tagged user pointers (with the top byte set to something else other > than 0x00) as syscall arguments. > > userfaultfd code use provided user pointers for vma lookups, which can > only by done with untagged pointers. > > Untag user pointers in validate_range(). > > Signed-off-by: Andrey Konovalov Reviewed-by: Catalin Marinas