From owner-svn-src-head@freebsd.org Wed Sep 5 19:16:10 2018 Return-Path: Delivered-To: svn-src-head@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 7188FFFA811; Wed, 5 Sep 2018 19:16:10 +0000 (UTC) (envelope-from jilles@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 1E4238F46D; Wed, 5 Sep 2018 19:16:10 +0000 (UTC) (envelope-from jilles@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 12E9629EB0; Wed, 5 Sep 2018 19:16:10 +0000 (UTC) (envelope-from jilles@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.37]) by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id w85JG9vb013100; Wed, 5 Sep 2018 19:16:09 GMT (envelope-from jilles@FreeBSD.org) Received: (from jilles@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id w85JG9cF013099; Wed, 5 Sep 2018 19:16:09 GMT (envelope-from jilles@FreeBSD.org) Message-Id: <201809051916.w85JG9cF013099@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: jilles set sender to jilles@FreeBSD.org using -f From: Jilles Tjoelker Date: Wed, 5 Sep 2018 19:16:09 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r338473 - head/bin/sh X-SVN-Group: head X-SVN-Commit-Author: jilles X-SVN-Commit-Paths: head/bin/sh X-SVN-Commit-Revision: 338473 X-SVN-Commit-Repository: base MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: svn-src-head@freebsd.org X-Mailman-Version: 2.1.27 Precedence: list List-Id: SVN commit messages for the src tree for head/-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 05 Sep 2018 19:16:10 -0000 Author: jilles Date: Wed Sep 5 19:16:09 2018 New Revision: 338473 URL: https://svnweb.freebsd.org/changeset/base/338473 Log: sh: Fix formal overflow in pointer arithmetic The intention is to lower the value of the pointer, which according to ubsan cannot be done by adding an unsigned quantity. Reported by: kevans Approved by: re (kib) MFC after: 1 week Modified: head/bin/sh/expand.c Modified: head/bin/sh/expand.c ============================================================================== --- head/bin/sh/expand.c Wed Sep 5 19:05:30 2018 (r338472) +++ head/bin/sh/expand.c Wed Sep 5 19:16:09 2018 (r338473) @@ -896,7 +896,7 @@ reprocess(int startloc, int flag, int subtype, int quo startp = stackblock() + startloc; len = expdest - startp; - if (len >= SIZE_MAX / 2) + if (len >= SIZE_MAX / 2 || len > PTRDIFF_MAX) abort(); INTOFF; if (len >= buflen) { @@ -912,7 +912,7 @@ reprocess(int startloc, int flag, int subtype, int quo INTON; memcpy(buf, startp, len); buf[len] = '\0'; - STADJUST(-len, expdest); + STADJUST(-(ptrdiff_t)len, expdest); for (zpos = 0;;) { zlen = strlen(buf + zpos); strtodest(buf + zpos, flag, subtype, quoted, dst);