From owner-svn-src-stable@freebsd.org Wed Sep 16 04:20:40 2015 Return-Path: Delivered-To: svn-src-stable@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 8EDE29C287C; Wed, 16 Sep 2015 04:20:40 +0000 (UTC) (envelope-from kib@FreeBSD.org) Received: from repo.freebsd.org (repo.freebsd.org [IPv6:2001:1900:2254:2068::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 7C570130E; Wed, 16 Sep 2015 04:20:40 +0000 (UTC) (envelope-from kib@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.70]) by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id t8G4KekA074703; Wed, 16 Sep 2015 04:20:40 GMT (envelope-from kib@FreeBSD.org) Received: (from kib@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id t8G4KenV074702; Wed, 16 Sep 2015 04:20:40 GMT (envelope-from kib@FreeBSD.org) Message-Id: <201509160420.t8G4KenV074702@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: kib set sender to kib@FreeBSD.org using -f From: Konstantin Belousov Date: Wed, 16 Sep 2015 04:20:40 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-10@freebsd.org Subject: svn commit: r287846 - stable/10/sys/vm X-SVN-Group: stable-10 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: svn-src-stable@freebsd.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: SVN commit messages for all the -stable branches of the src tree List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 16 Sep 2015 04:20:40 -0000 Author: kib Date: Wed Sep 16 04:20:39 2015 New Revision: 287846 URL: https://svnweb.freebsd.org/changeset/base/287846 Log: MFC r287591: There is no reason in the current kernel to disallow write access to the COW wired entry if the entry permissions allow it. Remove the check. Modified: stable/10/sys/vm/vm_map.c Directory Properties: stable/10/ (props changed) Modified: stable/10/sys/vm/vm_map.c ============================================================================== --- stable/10/sys/vm/vm_map.c Wed Sep 16 04:15:46 2015 (r287845) +++ stable/10/sys/vm/vm_map.c Wed Sep 16 04:20:39 2015 (r287846) @@ -3989,12 +3989,10 @@ RetryLookup:; vm_map_unlock_read(map); return (KERN_PROTECTION_FAILURE); } - if ((entry->eflags & MAP_ENTRY_USER_WIRED) && - (entry->eflags & MAP_ENTRY_COW) && - (fault_type & VM_PROT_WRITE)) { - vm_map_unlock_read(map); - return (KERN_PROTECTION_FAILURE); - } + KASSERT((prot & VM_PROT_WRITE) == 0 || (entry->eflags & + (MAP_ENTRY_USER_WIRED | MAP_ENTRY_NEEDS_COPY)) != + (MAP_ENTRY_USER_WIRED | MAP_ENTRY_NEEDS_COPY), + ("entry %p flags %x", entry, entry->eflags)); if ((fault_typea & VM_PROT_COPY) != 0 && (entry->max_protection & VM_PROT_WRITE) == 0 && (entry->eflags & MAP_ENTRY_COW) == 0) { @@ -4148,10 +4146,6 @@ vm_map_lookup_locked(vm_map_t *var_map, fault_type &= VM_PROT_READ | VM_PROT_WRITE | VM_PROT_EXECUTE; if ((fault_type & prot) != fault_type) return (KERN_PROTECTION_FAILURE); - if ((entry->eflags & MAP_ENTRY_USER_WIRED) && - (entry->eflags & MAP_ENTRY_COW) && - (fault_type & VM_PROT_WRITE)) - return (KERN_PROTECTION_FAILURE); /* * If this page is not pageable, we have to get it for all possible