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[217.140.101.70]) by mx.google.com with ESMTP id jp19si311538ejb.116.2019.03.22.04.44.08 for ; Fri, 22 Mar 2019 04:44:09 -0700 (PDT) Received-SPF: pass (google.com: domain of catalin.marinas@arm.com designates 217.140.101.70 as permitted sender) client-ip=217.140.101.70; Authentication-Results: mx.google.com; spf=pass (google.com: domain of catalin.marinas@arm.com designates 217.140.101.70 as permitted sender) smtp.mailfrom=catalin.marinas@arm.com Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 171FE374; Fri, 22 Mar 2019 04:44:08 -0700 (PDT) Received: from arrakis.emea.arm.com (arrakis.cambridge.arm.com [10.1.196.78]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 588F73F575; Fri, 22 Mar 2019 04:44:00 -0700 (PDT) Date: Fri, 22 Mar 2019 11:43:57 +0000 From: Catalin Marinas To: Andrey Konovalov Cc: Will Deacon , Mark Rutland , Robin Murphy , Kees Cook , Kate Stewart , Greg Kroah-Hartman , Andrew Morton , Ingo Molnar , "Kirill A . Shutemov" , Shuah Khan , Vincenzo Frascino , Eric Dumazet , "David S. Miller" , Alexei Starovoitov , Daniel Borkmann , Steven Rostedt , Ingo Molnar , Peter Zijlstra , Arnaldo Carvalho de Melo , Alex Deucher , Christian =?iso-8859-1?Q?K=F6nig?= , "David (ChunMing) Zhou" , Yishai Hadas , Mauro Carvalho Chehab , Jens Wiklander , Alex Williamson , linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org, linux-arch@vger.kernel.org, netdev@vger.kernel.org, bpf@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, linux-kernel@vger.kernel.org, Dmitry Vyukov , Kostya Serebryany , Evgeniy Stepanov , Lee Smith , Ramana Radhakrishnan , Jacob Bramley , Ruben Ayrapetyan , Chintan Pandya , Luc Van Oostenryck , Dave Martin , Kevin Brodsky , Szabolcs Nagy Subject: Re: [PATCH v13 04/20] mm, arm64: untag user pointers passed to memory syscalls Message-ID: <20190322114357.GC13384@arrakis.emea.arm.com> References: <44ad2d0c55dbad449edac23ae46d151a04102a1d.1553093421.git.andreyknvl@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <44ad2d0c55dbad449edac23ae46d151a04102a1d.1553093421.git.andreyknvl@google.com> User-Agent: Mutt/1.10.1 (2018-07-13) X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Wed, Mar 20, 2019 at 03:51:18PM +0100, 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 allows tagged pointers to be passed to the following memory > syscalls: madvise, mbind, get_mempolicy, mincore, mlock, mlock2, brk, > mmap_pgoff, old_mmap, munmap, remap_file_pages, mprotect, pkey_mprotect, > mremap, msync and shmdt. > > This is done by untagging pointers passed to these syscalls in the > prologues of their handlers. > > Signed-off-by: Andrey Konovalov > --- > ipc/shm.c | 2 ++ > mm/madvise.c | 2 ++ > mm/mempolicy.c | 5 +++++ > mm/migrate.c | 1 + > mm/mincore.c | 2 ++ > mm/mlock.c | 5 +++++ > mm/mmap.c | 7 +++++++ > mm/mprotect.c | 1 + > mm/mremap.c | 2 ++ > mm/msync.c | 2 ++ > 10 files changed, 29 insertions(+) I wonder whether it's better to keep these as wrappers in the arm64 code. -- Catalin