From patchwork Tue Sep 15 14:55:08 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Laight X-Patchwork-Id: 11778335 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id E7A3A1709 for ; Tue, 15 Sep 2020 23:05:44 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D536A208E4 for ; Tue, 15 Sep 2020 23:05:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727333AbgIOXEu convert rfc822-to-8bit (ORCPT ); Tue, 15 Sep 2020 19:04:50 -0400 Received: from eu-smtp-delivery-151.mimecast.com ([185.58.86.151]:39815 "EHLO eu-smtp-delivery-151.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727080AbgIOOzX (ORCPT ); Tue, 15 Sep 2020 10:55:23 -0400 Received: from AcuMS.aculab.com (156.67.243.126 [156.67.243.126]) (Using TLS) by relay.mimecast.com with ESMTP id uk-mta-73-k-A8mJujN9e8Iji4iGTvBQ-1; Tue, 15 Sep 2020 15:55:09 +0100 X-MC-Unique: k-A8mJujN9e8Iji4iGTvBQ-1 Received: from AcuMS.Aculab.com (fd9f:af1c:a25b:0:43c:695e:880f:8750) by AcuMS.aculab.com (fd9f:af1c:a25b:0:43c:695e:880f:8750) with Microsoft SMTP Server (TLS) id 15.0.1347.2; Tue, 15 Sep 2020 15:55:09 +0100 Received: from AcuMS.Aculab.com ([fe80::43c:695e:880f:8750]) by AcuMS.aculab.com ([fe80::43c:695e:880f:8750%12]) with mapi id 15.00.1347.000; Tue, 15 Sep 2020 15:55:09 +0100 From: David Laight To: "linux-kernel@vger.kernel.org" , "netdev@vger.kernel.org" , "io-uring@vger.kernel.org" , Jens Axboe , "David S. Miller" , Al Viro , linux-fsdevel Subject: [PATCH 1/9 next] mm:process_vm_access Call import_iovec() instead of rw_copy_check_uvector() Thread-Topic: [PATCH 1/9 next] mm:process_vm_access Call import_iovec() instead of rw_copy_check_uvector() Thread-Index: AdaLbkkTBW5in2pQRDCVHbW9ZQK6vQ== Date: Tue, 15 Sep 2020 14:55:08 +0000 Message-ID: Accept-Language: en-GB, en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.202.205.107] MIME-Version: 1.0 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=C51A453 smtp.mailfrom=david.laight@aculab.com X-Mimecast-Spam-Score: 0.002 X-Mimecast-Originator: aculab.com Content-Language: en-US Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org This is the only direct call of rw_copy_check_uvector(). Removing it lets rw_copy_check_uvector() be inlined into import_iovec() and the horrid calling conventions fixed. Signed-off-by: David Laight --- mm/process_vm_access.c | 31 ++++++++++++++++--------------- 1 file changed, 16 insertions(+), 15 deletions(-) diff --git a/mm/process_vm_access.c b/mm/process_vm_access.c index 29c052099aff..1cc3d6f66b31 100644 --- a/mm/process_vm_access.c +++ b/mm/process_vm_access.c @@ -264,7 +264,7 @@ static ssize_t process_vm_rw(pid_t pid, struct iovec iovstack_r[UIO_FASTIOV]; struct iovec *iov_l = iovstack_l; struct iovec *iov_r = iovstack_r; - struct iov_iter iter; + struct iov_iter iter_l, iter_r; ssize_t rc; int dir = vm_write ? WRITE : READ; @@ -272,23 +272,24 @@ static ssize_t process_vm_rw(pid_t pid, return -EINVAL; /* Check iovecs */ - rc = import_iovec(dir, lvec, liovcnt, UIO_FASTIOV, &iov_l, &iter); + rc = import_iovec(dir, lvec, liovcnt, UIO_FASTIOV, &iov_l, &iter_l); if (rc < 0) return rc; - if (!iov_iter_count(&iter)) + if (!iov_iter_count(&iter_l)) goto free_iovecs; - rc = rw_copy_check_uvector(CHECK_IOVEC_ONLY, rvec, riovcnt, UIO_FASTIOV, - iovstack_r, &iov_r); + rc = import_iovec(CHECK_IOVEC_ONLY, rvec, riovcnt, UIO_FASTIOV, &iov_r, &iter_r); if (rc <= 0) goto free_iovecs; - rc = process_vm_rw_core(pid, &iter, iov_r, riovcnt, flags, vm_write); + rc = process_vm_rw_core(pid, &iter_l, iter_r.iov, iter_r.nr_segs, + flags, vm_write); free_iovecs: if (iov_r != iovstack_r) kfree(iov_r); - kfree(iov_l); + if (iov_l != iovstack_l) + kfree(iov_l); return rc; } @@ -322,30 +323,30 @@ compat_process_vm_rw(compat_pid_t pid, struct iovec iovstack_r[UIO_FASTIOV]; struct iovec *iov_l = iovstack_l; struct iovec *iov_r = iovstack_r; - struct iov_iter iter; + struct iov_iter iter_l, iter_r; ssize_t rc = -EFAULT; int dir = vm_write ? WRITE : READ; if (flags != 0) return -EINVAL; - rc = compat_import_iovec(dir, lvec, liovcnt, UIO_FASTIOV, &iov_l, &iter); + rc = compat_import_iovec(dir, lvec, liovcnt, UIO_FASTIOV, &iov_l, &iter_l); if (rc < 0) return rc; - if (!iov_iter_count(&iter)) + if (!iov_iter_count(&iter_l)) goto free_iovecs; - rc = compat_rw_copy_check_uvector(CHECK_IOVEC_ONLY, rvec, riovcnt, - UIO_FASTIOV, iovstack_r, - &iov_r); + rc = compat_import_iovec(0, rvec, riovcnt, UIO_FASTIOV, &iov_r, &iter_r); if (rc <= 0) goto free_iovecs; - rc = process_vm_rw_core(pid, &iter, iov_r, riovcnt, flags, vm_write); + rc = process_vm_rw_core(pid, &iter_l, iter_r.iov, iter_r.nr_segs, + flags, vm_write); free_iovecs: if (iov_r != iovstack_r) kfree(iov_r); - kfree(iov_l); + if (iov_l != iovstack_l) + kfree(iov_l); return rc; }