From owner-svn-src-stable-11@freebsd.org Sun Dec 31 05:16:24 2017 Return-Path: Delivered-To: svn-src-stable-11@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 8EBF1EA131F; Sun, 31 Dec 2017 05:16:24 +0000 (UTC) (envelope-from mjg@FreeBSD.org) Received: from repo.freebsd.org (repo.freebsd.org [IPv6:2610:1c1:1:6068::e6a:0]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 5978F2B06; Sun, 31 Dec 2017 05:16:24 +0000 (UTC) (envelope-from mjg@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.37]) by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id vBV5GN3v042067; Sun, 31 Dec 2017 05:16:23 GMT (envelope-from mjg@FreeBSD.org) Received: (from mjg@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id vBV5GN7F042066; Sun, 31 Dec 2017 05:16:23 GMT (envelope-from mjg@FreeBSD.org) Message-Id: <201712310516.vBV5GN7F042066@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: mjg set sender to mjg@FreeBSD.org using -f From: Mateusz Guzik Date: Sun, 31 Dec 2017 05:16:23 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-11@freebsd.org Subject: svn commit: r327415 - stable/11/sys/kern X-SVN-Group: stable-11 X-SVN-Commit-Author: mjg X-SVN-Commit-Paths: stable/11/sys/kern X-SVN-Commit-Revision: 327415 X-SVN-Commit-Repository: base MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: svn-src-stable-11@freebsd.org X-Mailman-Version: 2.1.25 Precedence: list List-Id: SVN commit messages for only the 11-stable src tree List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 31 Dec 2017 05:16:24 -0000 Author: mjg Date: Sun Dec 31 05:16:23 2017 New Revision: 327415 URL: https://svnweb.freebsd.org/changeset/base/327415 Log: MFC r324045: sysctl: remove target buffer read/write checks prior to calling the handler Said checks were inherently racy anyway as jokers could unmap target areas before the handler got around to accessing them. This saves time by avoiding locking the address space. Modified: stable/11/sys/kern/kern_sysctl.c Directory Properties: stable/11/ (props changed) Modified: stable/11/sys/kern/kern_sysctl.c ============================================================================== --- stable/11/sys/kern/kern_sysctl.c Sun Dec 31 05:14:40 2017 (r327414) +++ stable/11/sys/kern/kern_sysctl.c Sun Dec 31 05:16:23 2017 (r327415) @@ -1982,16 +1982,9 @@ userland_sysctl(struct thread *td, int *name, u_int na } } req.validlen = req.oldlen; + req.oldptr = old; - if (old) { - if (!useracc(old, req.oldlen, VM_PROT_WRITE)) - return (EFAULT); - req.oldptr= old; - } - if (new != NULL) { - if (!useracc(new, newlen, VM_PROT_READ)) - return (EFAULT); req.newlen = newlen; req.newptr = new; }