From owner-svn-src-stable@freebsd.org Sat Mar 30 10:03:27 2019 Return-Path: Delivered-To: svn-src-stable@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 65D00156D484; Sat, 30 Mar 2019 10:03:27 +0000 (UTC) (envelope-from kib@FreeBSD.org) Received: from mxrelay.nyi.freebsd.org (mxrelay.nyi.freebsd.org [IPv6:2610:1c1:1:606c::19:3]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) server-signature RSA-PSS (4096 bits) client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "mxrelay.nyi.freebsd.org", Issuer "Let's Encrypt Authority X3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id F2E558091F; Sat, 30 Mar 2019 10:03:26 +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 mxrelay.nyi.freebsd.org (Postfix) with ESMTPS id C9CD7D3E3; Sat, 30 Mar 2019 10:03:26 +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 x2UA3Q5G075355; Sat, 30 Mar 2019 10:03:26 GMT (envelope-from kib@FreeBSD.org) Received: (from kib@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id x2UA3QsA075354; Sat, 30 Mar 2019 10:03:26 GMT (envelope-from kib@FreeBSD.org) Message-Id: <201903301003.x2UA3QsA075354@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: kib set sender to kib@FreeBSD.org using -f From: Konstantin Belousov Date: Sat, 30 Mar 2019 10:03:26 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-12@freebsd.org Subject: svn commit: r345730 - stable/12/sys/vm X-SVN-Group: stable-12 X-SVN-Commit-Author: kib X-SVN-Commit-Paths: stable/12/sys/vm X-SVN-Commit-Revision: 345730 X-SVN-Commit-Repository: base MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: F2E558091F X-Spamd-Bar: -- Authentication-Results: mx1.freebsd.org X-Spamd-Result: default: False [-2.94 / 15.00]; local_wl_from(0.00)[FreeBSD.org]; NEURAL_HAM_MEDIUM(-1.00)[-0.998,0]; NEURAL_HAM_SHORT(-0.95)[-0.947,0]; NEURAL_HAM_LONG(-1.00)[-1.000,0]; ASN(0.00)[asn:11403, ipnet:2610:1c1:1::/48, country:US] X-BeenThere: svn-src-stable@freebsd.org X-Mailman-Version: 2.1.29 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: Sat, 30 Mar 2019 10:03:27 -0000 Author: kib Date: Sat Mar 30 10:03:26 2019 New Revision: 345730 URL: https://svnweb.freebsd.org/changeset/base/345730 Log: MFC r345452: ASLR: check for max_addr after applying randomization, not before. Modified: stable/12/sys/vm/vm_map.c Directory Properties: stable/12/ (props changed) Modified: stable/12/sys/vm/vm_map.c ============================================================================== --- stable/12/sys/vm/vm_map.c Sat Mar 30 09:24:06 2019 (r345729) +++ stable/12/sys/vm/vm_map.c Sat Mar 30 10:03:26 2019 (r345730) @@ -1673,11 +1673,12 @@ again: (max_addr == 0 || max_addr > MAP_32BIT_MAX_ADDR) ? aslr_pages_rnd_64[pidx] : aslr_pages_rnd_32[pidx]; if (vm_map_findspace(map, curr_min_addr, length + - gap * pagesizes[pidx], addr) || - (max_addr != 0 && *addr + length > max_addr)) + gap * pagesizes[pidx], addr)) goto again; /* And randomize the start address. */ *addr += (arc4random() % gap) * pagesizes[pidx]; + if (max_addr != 0 && *addr + length > max_addr) + goto again; } else if (vm_map_findspace(map, curr_min_addr, length, addr) || (max_addr != 0 && *addr + length > max_addr)) { if (cluster) {