From owner-svn-src-stable-12@freebsd.org Wed Oct 28 21:02:44 2020 Return-Path: Delivered-To: svn-src-stable-12@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id 4CDFB4504D1; Wed, 28 Oct 2020 21:02:44 +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) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 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 4CM1HS1Npdz4ZfK; Wed, 28 Oct 2020 21:02:44 +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 13975221F4; Wed, 28 Oct 2020 21:02:44 +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 09SL2h3K036556; Wed, 28 Oct 2020 21:02:43 GMT (envelope-from kib@FreeBSD.org) Received: (from kib@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id 09SL2hNJ036555; Wed, 28 Oct 2020 21:02:43 GMT (envelope-from kib@FreeBSD.org) Message-Id: <202010282102.09SL2hNJ036555@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: kib set sender to kib@FreeBSD.org using -f From: Konstantin Belousov Date: Wed, 28 Oct 2020 21:02:43 +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: r367116 - stable/12/lib/libc/sys X-SVN-Group: stable-12 X-SVN-Commit-Author: kib X-SVN-Commit-Paths: stable/12/lib/libc/sys X-SVN-Commit-Revision: 367116 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-12@freebsd.org X-Mailman-Version: 2.1.33 Precedence: list List-Id: SVN commit messages for only the 12-stable src tree List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 28 Oct 2020 21:02:44 -0000 Author: kib Date: Wed Oct 28 21:02:43 2020 New Revision: 367116 URL: https://svnweb.freebsd.org/changeset/base/367116 Log: MFC r366918: mmap(2): Document guard size for MAP_STACK and related EINVAL. Modified: stable/12/lib/libc/sys/mmap.2 Directory Properties: stable/12/ (props changed) Modified: stable/12/lib/libc/sys/mmap.2 ============================================================================== --- stable/12/lib/libc/sys/mmap.2 Wed Oct 28 21:01:00 2020 (r367115) +++ stable/12/lib/libc/sys/mmap.2 Wed Oct 28 21:02:43 2020 (r367116) @@ -28,7 +28,7 @@ .\" @(#)mmap.2 8.4 (Berkeley) 5/11/95 .\" $FreeBSD$ .\" -.Dd June 22, 2017 +.Dd October 21, 2020 .Dt MMAP 2 .Os .Sh NAME @@ -335,6 +335,8 @@ Stacks created with automatically grow. Guards prevent inadvertent use of the regions into which those stacks can grow without requiring mapping the whole stack in advance. +The size of the guard, in pages, is specified by sysctl +.Dv security.bsd.stack_guard_page . .El .Pp The @@ -435,6 +437,11 @@ or .Dv MAP_STACK was specified. At least one of these flags must be included. +.It Bq Er EINVAL +.Dv MAP_STACK +was specified and +.Va len +is less than or equal to the guard size. .It Bq Er EINVAL .Dv MAP_FIXED was specified and the