From owner-svn-src-stable-9@FreeBSD.ORG Fri Dec 13 06:29:03 2013 Return-Path: Delivered-To: svn-src-stable-9@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [8.8.178.115]) (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id 232D21AA; Fri, 13 Dec 2013 06:29:03 +0000 (UTC) Received: from svn.freebsd.org (svn.freebsd.org [IPv6:2001:1900:2254:2068::e6a:0]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mx1.freebsd.org (Postfix) with ESMTPS id E93961712; Fri, 13 Dec 2013 06:29:02 +0000 (UTC) Received: from svn.freebsd.org ([127.0.1.70]) by svn.freebsd.org (8.14.7/8.14.7) with ESMTP id rBD6T2SC087751; Fri, 13 Dec 2013 06:29:02 GMT (envelope-from kib@svn.freebsd.org) Received: (from kib@localhost) by svn.freebsd.org (8.14.7/8.14.7/Submit) id rBD6T2je087750; Fri, 13 Dec 2013 06:29:02 GMT (envelope-from kib@svn.freebsd.org) Message-Id: <201312130629.rBD6T2je087750@svn.freebsd.org> From: Konstantin Belousov Date: Fri, 13 Dec 2013 06:29:02 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-9@freebsd.org Subject: svn commit: r259300 - stable/9/sys/vm X-SVN-Group: stable-9 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: svn-src-stable-9@freebsd.org X-Mailman-Version: 2.1.17 Precedence: list List-Id: SVN commit messages for only the 9-stable src tree List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 13 Dec 2013 06:29:03 -0000 Author: kib Date: Fri Dec 13 06:29:02 2013 New Revision: 259300 URL: http://svnweb.freebsd.org/changeset/base/259300 Log: MFC r258367: Verify for zero-length requests and act as if it is always successfull without performing any action on the address space. Modified: stable/9/sys/vm/vm_map.c Directory Properties: stable/9/sys/ (props changed) Modified: stable/9/sys/vm/vm_map.c ============================================================================== --- stable/9/sys/vm/vm_map.c Fri Dec 13 06:28:18 2013 (r259299) +++ stable/9/sys/vm/vm_map.c Fri Dec 13 06:29:02 2013 (r259300) @@ -1894,6 +1894,9 @@ vm_map_protect(vm_map_t map, vm_offset_t struct ucred *cred; vm_prot_t old_prot; + if (start == end) + return (KERN_SUCCESS); + vm_map_lock(map); VM_MAP_RANGE_CHECK(map, start, end); @@ -2048,12 +2051,16 @@ vm_map_madvise( case MADV_AUTOSYNC: case MADV_NOCORE: case MADV_CORE: + if (start == end) + return (KERN_SUCCESS); modify_map = 1; vm_map_lock(map); break; case MADV_WILLNEED: case MADV_DONTNEED: case MADV_FREE: + if (start == end) + return (KERN_SUCCESS); vm_map_lock_read(map); break; default: @@ -2191,6 +2198,8 @@ vm_map_inherit(vm_map_t map, vm_offset_t default: return (KERN_INVALID_ARGUMENT); } + if (start == end) + return (KERN_SUCCESS); vm_map_lock(map); VM_MAP_RANGE_CHECK(map, start, end); if (vm_map_lookup_entry(map, start, &temp_entry)) { @@ -2223,6 +2232,8 @@ vm_map_unwire(vm_map_t map, vm_offset_t int rv; boolean_t need_wakeup, result, user_unwire; + if (start == end) + return (KERN_SUCCESS); user_unwire = (flags & VM_MAP_WIRE_USER) ? TRUE : FALSE; vm_map_lock(map); VM_MAP_RANGE_CHECK(map, start, end); @@ -2393,6 +2404,8 @@ vm_map_wire(vm_map_t map, vm_offset_t st boolean_t fictitious, need_wakeup, result, user_wire; vm_prot_t prot; + if (start == end) + return (KERN_SUCCESS); prot = 0; if (flags & VM_MAP_WIRE_WRITE) prot |= VM_PROT_WRITE; @@ -2835,6 +2848,8 @@ vm_map_delete(vm_map_t map, vm_offset_t vm_map_entry_t first_entry; VM_MAP_ASSERT_LOCKED(map); + if (start == end) + return (KERN_SUCCESS); /* * Find the start of the region, and clip it