From mboxrd@z Thu Jan 1 00:00:00 1970 From: Catalin Marinas Subject: Re: [PATCH v17 03/15] arm64: Introduce prctl() options to control the tagged user addresses ABI Date: Wed, 19 Jun 2019 16:29:39 +0100 Message-ID: <20190619152938.GD25211@arrakis.emea.arm.com> References: 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: 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" , Vincenzo Frascino , 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 Wed, Jun 19, 2019 at 04:45:02PM +0200, Andrey Konovalov wrote: > On Wed, Jun 12, 2019 at 1:43 PM Andrey Konovalov wrote: > > From: Catalin Marinas > > > > It is not desirable to relax the ABI to allow tagged user addresses into > > the kernel indiscriminately. This patch introduces a prctl() interface > > for enabling or disabling the tagged ABI with a global sysctl control > > for preventing applications from enabling the relaxed ABI (meant for > > testing user-space prctl() return error checking without reconfiguring > > the kernel). The ABI properties are inherited by threads of the same > > application and fork()'ed children but cleared on execve(). > > > > The PR_SET_TAGGED_ADDR_CTRL will be expanded in the future to handle > > MTE-specific settings like imprecise vs precise exceptions. > > > > Signed-off-by: Catalin Marinas > > Catalin, would you like to do the requested changes to this patch > yourself and send it to me or should I do that? I'll send you an updated version this week. -- Catalin