From mboxrd@z Thu Jan 1 00:00:00 1970 From: Catalin Marinas Subject: Re: [PATCH v15 17/17] selftests, arm64: add a selftest for passing tagged pointers to kernel Date: Fri, 31 May 2019 17:22:06 +0100 Message-ID: <20190531162206.GB3568@arrakis.emea.arm.com> References: <20190522141612.GA28122@arrakis.emea.arm.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: Sender: linux-kernel-owner@vger.kernel.org To: Andrey Konovalov Cc: Vincenzo Frascino , Linux ARM , Linux Memory Management List , LKML , amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, linux-rdma@vger.kernel.org, linux-media@vger.kernel.org, kvm@vger.kernel.org, "open list:KERNEL SELFTEST FRAMEWORK" , Will Deacon , Mark Rutland , Andrew Morton , Greg Kroah-Hartman , Kees Cook , Yishai Hadas , Felix Kuehling , Alexander Deucher , Christian Koenig List-Id: linux-rdma@vger.kernel.org On Fri, May 31, 2019 at 04:21:48PM +0200, Andrey Konovalov wrote: > On Wed, May 22, 2019 at 4:16 PM Catalin Marinas wrote: > > On Mon, May 06, 2019 at 06:31:03PM +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. > > > > > > This patch adds a simple test, that calls the uname syscall with a > > > tagged user pointer as an argument. Without the kernel accepting tagged > > > user pointers the test fails with EFAULT. > > > > That's probably sufficient for a simple example. Something we could add > > to Documentation maybe is a small library that can be LD_PRELOAD'ed so > > that you can run a lot more tests like LTP. > > Should I add this into this series, or should this go into Vincenzo's patchset? If you can tweak the selftest Makefile to build a library and force it with LD_PRELOAD, you can keep it with this patch. It would be easier to extend to other syscall tests, signal handling etc. -- Catalin