From patchwork Mon Jun 3 16:55:07 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andrey Konovalov X-Patchwork-Id: 10973427 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 97CB414E5 for ; Mon, 3 Jun 2019 16:57:46 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 8490A28658 for ; Mon, 3 Jun 2019 16:57:46 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 782362873A; Mon, 3 Jun 2019 16:57:46 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-15.5 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI, USER_IN_DEF_DKIM_WL autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id F249428658 for ; Mon, 3 Jun 2019 16:57:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729544AbfFCQzo (ORCPT ); Mon, 3 Jun 2019 12:55:44 -0400 Received: from mail-yw1-f73.google.com ([209.85.161.73]:54357 "EHLO mail-yw1-f73.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729539AbfFCQzk (ORCPT ); Mon, 3 Jun 2019 12:55:40 -0400 Received: by mail-yw1-f73.google.com with SMTP id g203so17149176ywe.21 for ; Mon, 03 Jun 2019 09:55:40 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=date:in-reply-to:message-id:mime-version:references:subject:from:to :cc; bh=ai2S3fD+fr3rvCBmSGFiSuVAfjaa7sExxiTSFFYH1Fc=; b=IhwpzfJqwE3DvUc/g2ohuoF7FRDSV+OKLdbdm3aHJhyQC5R8qffzGm3GUGDEK5mLGU HwRFraAw3ADQD0MAJJ3addDW9VF2xcSR/1cU+MqYWb30fZYz6OI+lqi9l0mvrBzJRKlx 9Jf/vJ7t9tP8BgDAD/yBWpZTteEGqZVu6BQfOgaOZ55GquSpR/7KRV6XVaghO9dlfSJI nnlViXK79lK70wRQBUW327/n/PMH7XujjWiQLfV9EFwKMzG6uOgMIpIPl3C2s4DgbvSu MCtmUckwctT1sQWlCUv7u3dxJmI+R7ltNLatQs+ATRBm1UQXWv9Bi0Pz/MXuzZkI0IoN 5eSw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=ai2S3fD+fr3rvCBmSGFiSuVAfjaa7sExxiTSFFYH1Fc=; b=XwajQG07FulQnhxK4YQCVAPsTFBP+VP/dmDtpaWzbmwPYEHvcYJoAXk5k3wZCh/X6C 7f+udJr8qOUQHzRUdYnTxcVoIY0lBeCxBIlP8Ctd0EOF9RZVGr9/WvTKj+i9VmWSWyDa xncokkEJLuGmg5J89mWKUnw8rCpZsrQbT1wCm+aqSFp3ieFPa8dyGjzTV4C/apLwk36x p8sRV4s27p65497TfGQuwElaRwjKEM7QhYPp2yH1vyL68U2I3d6SCDzhkND6rb0aNoGu aBeK5WM0kC/csNLKkZ8PZboL/2b+gA1vpQ+1w82ot8vKiBOke1zhrZURHqe8HjZTIqdl hUGg== X-Gm-Message-State: APjAAAW1laZHt0RnJvkhzjH75Kb0dL3ALDhurBWv8HYkZjk23Y+a+ck7 OlrZDIC/jQ1TC2BgOgWMckedpr6pnsSGWlwR X-Google-Smtp-Source: APXvYqyU8lBI93nJuhlJYUnIY7lf1oCA3Bdyf6XCo68IA8G3gKcVv3P8yXxzoFzeAZRqfZIBiTZMwuBdZZXNUsQZ X-Received: by 2002:a25:bfcf:: with SMTP id q15mr11764130ybm.453.1559580939725; Mon, 03 Jun 2019 09:55:39 -0700 (PDT) Date: Mon, 3 Jun 2019 18:55:07 +0200 In-Reply-To: Message-Id: <045a94326401693e015bf80c444a4d946a5c68ed.1559580831.git.andreyknvl@google.com> Mime-Version: 1.0 References: X-Mailer: git-send-email 2.22.0.rc1.311.g5d7573a151-goog Subject: [PATCH v16 05/16] arm64: untag user pointers passed to memory syscalls From: Andrey Konovalov To: 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 Cc: Catalin Marinas , 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 , Alex Williamson , Leon Romanovsky , Luc Van Oostenryck , Dave Martin , Khalid Aziz , enh , Jason Gunthorpe , Christoph Hellwig , Dmitry Vyukov , Kostya Serebryany , Evgeniy Stepanov , Lee Smith , Ramana Radhakrishnan , Jacob Bramley , Ruben Ayrapetyan , Robin Murphy , Kevin Brodsky , Szabolcs Nagy , Andrey Konovalov Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP 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: get_mempolicy, madvise, mbind, mincore, mlock, mlock2, mprotect, mremap, msync, munlock. Signed-off-by: Andrey Konovalov Reviewed-by: Kees Cook Reviewed-by: Catalin Marinas --- mm/madvise.c | 2 ++ mm/mempolicy.c | 3 +++ mm/mincore.c | 2 ++ mm/mlock.c | 4 ++++ mm/mprotect.c | 2 ++ mm/mremap.c | 2 ++ mm/msync.c | 2 ++ 7 files changed, 17 insertions(+) diff --git a/mm/madvise.c b/mm/madvise.c index 628022e674a7..39b82f8a698f 100644 --- a/mm/madvise.c +++ b/mm/madvise.c @@ -810,6 +810,8 @@ SYSCALL_DEFINE3(madvise, unsigned long, start, size_t, len_in, int, behavior) size_t len; struct blk_plug plug; + start = untagged_addr(start); + if (!madvise_behavior_valid(behavior)) return error; diff --git a/mm/mempolicy.c b/mm/mempolicy.c index 01600d80ae01..78e0a88b2680 100644 --- a/mm/mempolicy.c +++ b/mm/mempolicy.c @@ -1360,6 +1360,7 @@ static long kernel_mbind(unsigned long start, unsigned long len, int err; unsigned short mode_flags; + start = untagged_addr(start); mode_flags = mode & MPOL_MODE_FLAGS; mode &= ~MPOL_MODE_FLAGS; if (mode >= MPOL_MAX) @@ -1517,6 +1518,8 @@ static int kernel_get_mempolicy(int __user *policy, int uninitialized_var(pval); nodemask_t nodes; + addr = untagged_addr(addr); + if (nmask != NULL && maxnode < nr_node_ids) return -EINVAL; diff --git a/mm/mincore.c b/mm/mincore.c index c3f058bd0faf..64c322ed845c 100644 --- a/mm/mincore.c +++ b/mm/mincore.c @@ -249,6 +249,8 @@ SYSCALL_DEFINE3(mincore, unsigned long, start, size_t, len, unsigned long pages; unsigned char *tmp; + start = untagged_addr(start); + /* Check the start address: needs to be page-aligned.. */ if (start & ~PAGE_MASK) return -EINVAL; diff --git a/mm/mlock.c b/mm/mlock.c index 080f3b36415b..e82609eaa428 100644 --- a/mm/mlock.c +++ b/mm/mlock.c @@ -674,6 +674,8 @@ static __must_check int do_mlock(unsigned long start, size_t len, vm_flags_t fla unsigned long lock_limit; int error = -ENOMEM; + start = untagged_addr(start); + if (!can_do_mlock()) return -EPERM; @@ -735,6 +737,8 @@ SYSCALL_DEFINE2(munlock, unsigned long, start, size_t, len) { int ret; + start = untagged_addr(start); + len = PAGE_ALIGN(len + (offset_in_page(start))); start &= PAGE_MASK; diff --git a/mm/mprotect.c b/mm/mprotect.c index bf38dfbbb4b4..19f981b733bc 100644 --- a/mm/mprotect.c +++ b/mm/mprotect.c @@ -465,6 +465,8 @@ static int do_mprotect_pkey(unsigned long start, size_t len, const bool rier = (current->personality & READ_IMPLIES_EXEC) && (prot & PROT_READ); + start = untagged_addr(start); + prot &= ~(PROT_GROWSDOWN|PROT_GROWSUP); if (grows == (PROT_GROWSDOWN|PROT_GROWSUP)) /* can't be both */ return -EINVAL; diff --git a/mm/mremap.c b/mm/mremap.c index fc241d23cd97..1d98281f7204 100644 --- a/mm/mremap.c +++ b/mm/mremap.c @@ -606,6 +606,8 @@ SYSCALL_DEFINE5(mremap, unsigned long, addr, unsigned long, old_len, LIST_HEAD(uf_unmap_early); LIST_HEAD(uf_unmap); + addr = untagged_addr(addr); + if (flags & ~(MREMAP_FIXED | MREMAP_MAYMOVE)) return ret; diff --git a/mm/msync.c b/mm/msync.c index ef30a429623a..c3bd3e75f687 100644 --- a/mm/msync.c +++ b/mm/msync.c @@ -37,6 +37,8 @@ SYSCALL_DEFINE3(msync, unsigned long, start, size_t, len, int, flags) int unmapped_error = 0; int error = -EINVAL; + start = untagged_addr(start); + if (flags & ~(MS_ASYNC | MS_INVALIDATE | MS_SYNC)) goto out; if (offset_in_page(start))