From owner-svn-src-all@freebsd.org Thu Sep 6 20:29:41 2018 Return-Path: Delivered-To: svn-src-all@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 9D657FE4F26; Thu, 6 Sep 2018 20:29:41 +0000 (UTC) (envelope-from jhb@FreeBSD.org) Received: from mxrelay.nyi.freebsd.org (mxrelay.nyi.freebsd.org [IPv6:2610:1c1:1:606c::19:3]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "mxrelay.nyi.freebsd.org", Issuer "Let's Encrypt Authority X3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 540898B086; Thu, 6 Sep 2018 20:29:41 +0000 (UTC) (envelope-from jhb@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 mxrelay.nyi.freebsd.org (Postfix) with ESMTPS id 4EDCF12123; Thu, 6 Sep 2018 20:29:41 +0000 (UTC) (envelope-from jhb@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.37]) by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id w86KTfBB001411; Thu, 6 Sep 2018 20:29:41 GMT (envelope-from jhb@FreeBSD.org) Received: (from jhb@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id w86KTfxJ001410; Thu, 6 Sep 2018 20:29:41 GMT (envelope-from jhb@FreeBSD.org) Message-Id: <201809062029.w86KTfxJ001410@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: jhb set sender to jhb@FreeBSD.org using -f From: John Baldwin Date: Thu, 6 Sep 2018 20:29:41 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r338511 - head/lib/libvmmapi X-SVN-Group: head X-SVN-Commit-Author: jhb X-SVN-Commit-Paths: head/lib/libvmmapi X-SVN-Commit-Revision: 338511 X-SVN-Commit-Repository: base MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: svn-src-all@freebsd.org X-Mailman-Version: 2.1.27 Precedence: list List-Id: "SVN commit messages for the entire src tree \(except for " user" and " projects" \)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 06 Sep 2018 20:29:41 -0000 Author: jhb Date: Thu Sep 6 20:29:40 2018 New Revision: 338511 URL: https://svnweb.freebsd.org/changeset/base/338511 Log: bhyve: Use MAP_GUARD when mapping guest memory ranges. Instead of relying on PROT_NONE mappings with MAP_ANON, use MAP_GUARD to reserve address space around guest memory ranges including the guard ranges of address space around mappings. Submitted by: Shawn Webb Reviewed by: araujo Approved by: re (rgrimes) MFC after: 1 month Sponsored by: HardendBSD and G2, Inc Differential Revision: https://reviews.freebsd.org/D16822 Modified: head/lib/libvmmapi/vmmapi.c Modified: head/lib/libvmmapi/vmmapi.c ============================================================================== --- head/lib/libvmmapi/vmmapi.c Thu Sep 6 20:02:19 2018 (r338510) +++ head/lib/libvmmapi/vmmapi.c Thu Sep 6 20:29:40 2018 (r338511) @@ -362,7 +362,7 @@ vm_setup_memory(struct vmctx *ctx, size_t memsize, enu size_t objsize, len; vm_paddr_t gpa; char *baseaddr, *ptr; - int error, flags; + int error; assert(vms == VM_MMAP_ALL); @@ -389,8 +389,7 @@ vm_setup_memory(struct vmctx *ctx, size_t memsize, enu * and the adjoining guard regions. */ len = VM_MMAP_GUARD_SIZE + objsize + VM_MMAP_GUARD_SIZE; - flags = MAP_PRIVATE | MAP_ANON | MAP_NOCORE | MAP_ALIGNED_SUPER; - ptr = mmap(NULL, len, PROT_NONE, flags, -1, 0); + ptr = mmap(NULL, len, PROT_NONE, MAP_GUARD | MAP_ALIGNED_SUPER, -1, 0); if (ptr == MAP_FAILED) return (-1); @@ -492,8 +491,8 @@ vm_create_devmem(struct vmctx *ctx, int segid, const c * adjoining guard regions. */ len2 = VM_MMAP_GUARD_SIZE + len + VM_MMAP_GUARD_SIZE; - flags = MAP_PRIVATE | MAP_ANON | MAP_NOCORE | MAP_ALIGNED_SUPER; - base = mmap(NULL, len2, PROT_NONE, flags, -1, 0); + base = mmap(NULL, len2, PROT_NONE, MAP_GUARD | MAP_ALIGNED_SUPER, -1, + 0); if (base == MAP_FAILED) goto done;