From owner-svn-src-stable-10@freebsd.org Tue May 9 16:29:08 2017 Return-Path: Delivered-To: svn-src-stable-10@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 0A78AD65B2B; Tue, 9 May 2017 16:29:08 +0000 (UTC) (envelope-from brooks@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 CFF6535B; Tue, 9 May 2017 16:29:07 +0000 (UTC) (envelope-from brooks@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.37]) by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id v49GT6G3032375; Tue, 9 May 2017 16:29:06 GMT (envelope-from brooks@FreeBSD.org) Received: (from brooks@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id v49GT6Dn032374; Tue, 9 May 2017 16:29:06 GMT (envelope-from brooks@FreeBSD.org) Message-Id: <201705091629.v49GT6Dn032374@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: brooks set sender to brooks@FreeBSD.org using -f From: Brooks Davis Date: Tue, 9 May 2017 16:29:06 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-10@freebsd.org Subject: svn commit: r318030 - stable/10/lib/libc/regex X-SVN-Group: stable-10 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: svn-src-stable-10@freebsd.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: SVN commit messages for only the 10-stable src tree List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 09 May 2017 16:29:08 -0000 Author: brooks Date: Tue May 9 16:29:06 2017 New Revision: 318030 URL: https://svnweb.freebsd.org/changeset/base/318030 Log: MFC r317707: Correct an out-of-bounds read in regcomp when the RE is bad. When passed the invalid regular expression "a**", the error is eventually detected and seterr() is called. It sets p->error appropriatly and p->next and p->end to nuls which is a never used char nuls[10] which is zeros due to .bss initialization. Unfortunatly, p_ere_exp() and p_simp_re() both have fall through cases where they set the error, decrement p->next and access it which means a read from whatever .bss variable comes before nuls. Found with regex_test:repet_multi and CHERI bounds checking. Reviewed by: ngie, pfg, emaste Obtained from: CheriBSD Sponsored by: DARPA, AFRL Differential Revision: https://reviews.freebsd.org/D10541 Modified: stable/10/lib/libc/regex/regcomp.c Directory Properties: stable/10/ (props changed) Modified: stable/10/lib/libc/regex/regcomp.c ============================================================================== --- stable/10/lib/libc/regex/regcomp.c Tue May 9 16:27:20 2017 (r318029) +++ stable/10/lib/libc/regex/regcomp.c Tue May 9 16:29:06 2017 (r318030) @@ -444,6 +444,8 @@ p_ere_exp(struct parse *p) (void)REQUIRE(!MORE() || !isdigit((uch)PEEK()), REG_BADRPT); /* FALLTHROUGH */ default: + if (p->error != 0) + return; p->next--; wc = WGETNEXT(); ordinary(p, wc); @@ -651,6 +653,8 @@ p_simp_re(struct parse *p, (void)REQUIRE(starordinary, REG_BADRPT); /* FALLTHROUGH */ default: + if (p->error != 0) + return(0); /* Definitely not $... */ p->next--; wc = WGETNEXT(); ordinary(p, wc);