From owner-svn-src-stable@freebsd.org Wed Jul 5 06:32:54 2017 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 6DCDADA3751; Wed, 5 Jul 2017 06:32:54 +0000 (UTC) (envelope-from kib@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 3BE997492D; Wed, 5 Jul 2017 06:32:54 +0000 (UTC) (envelope-from kib@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.37]) by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id v656WrcU043678; Wed, 5 Jul 2017 06:32:53 GMT (envelope-from kib@FreeBSD.org) Received: (from kib@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id v656WrBw043677; Wed, 5 Jul 2017 06:32:53 GMT (envelope-from kib@FreeBSD.org) Message-Id: <201707050632.v656WrBw043677@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: kib set sender to kib@FreeBSD.org using -f From: Konstantin Belousov Date: Wed, 5 Jul 2017 06:32:53 +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: r320667 - stable/11/libexec/rtld-elf X-SVN-Group: stable-11 X-SVN-Commit-Author: kib X-SVN-Commit-Paths: stable/11/libexec/rtld-elf X-SVN-Commit-Revision: 320667 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@freebsd.org X-Mailman-Version: 2.1.23 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, 05 Jul 2017 06:32:54 -0000 Author: kib Date: Wed Jul 5 06:32:53 2017 New Revision: 320667 URL: https://svnweb.freebsd.org/changeset/base/320667 Log: MFC r320318: Use address space guard to implement inter-segment gap. Modified: stable/11/libexec/rtld-elf/map_object.c Directory Properties: stable/11/ (props changed) Modified: stable/11/libexec/rtld-elf/map_object.c ============================================================================== --- stable/11/libexec/rtld-elf/map_object.c Wed Jul 5 06:18:00 2017 (r320666) +++ stable/11/libexec/rtld-elf/map_object.c Wed Jul 5 06:32:53 2017 (r320667) @@ -41,6 +41,8 @@ static Elf_Ehdr *get_elf_header(int, const char *, const struct stat *); static int convert_flags(int); /* Elf flags -> mmap flags */ +int __getosreldate(void); + /* * Map a shared object into memory. The "fd" argument is a file descriptor, * which must be open on the object and positioned at its beginning. @@ -190,7 +192,9 @@ map_object(int fd, const char *path, const struct stat base_vlimit = round_page(segs[nsegs]->p_vaddr + segs[nsegs]->p_memsz); mapsize = base_vlimit - base_vaddr; base_addr = (caddr_t) base_vaddr; - base_flags = MAP_PRIVATE | MAP_ANON | MAP_NOCORE; + base_flags = __getosreldate() >= P_OSREL_MAP_GUARD || + (P_OSREL_MAJOR(__getosreldate()) == 11 && __getosreldate() >= + P_OSREL_MAP_GUARD_11) ? MAP_GUARD : MAP_PRIVATE | MAP_ANON | MAP_NOCORE; if (npagesizes > 1 && round_page(segs[0]->p_filesz) >= pagesizes[1]) base_flags |= MAP_ALIGNED_SUPER; if (base_vaddr != 0)