From owner-svn-src-head@freebsd.org Sun Aug 2 00:18:49 2015 Return-Path: Delivered-To: svn-src-head@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 9C8379B1A06; Sun, 2 Aug 2015 00:18:49 +0000 (UTC) (envelope-from markj@FreeBSD.org) Received: from repo.freebsd.org (repo.freebsd.org [IPv6:2001:1900:2254:2068::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 6BAC21B3; Sun, 2 Aug 2015 00:18:49 +0000 (UTC) (envelope-from markj@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.70]) by repo.freebsd.org (8.14.9/8.14.9) with ESMTP id t720Inki019185; Sun, 2 Aug 2015 00:18:49 GMT (envelope-from markj@FreeBSD.org) Received: (from markj@localhost) by repo.freebsd.org (8.14.9/8.14.9/Submit) id t720In8x019184; Sun, 2 Aug 2015 00:18:49 GMT (envelope-from markj@FreeBSD.org) Message-Id: <201508020018.t720In8x019184@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: markj set sender to markj@FreeBSD.org using -f From: Mark Johnston Date: Sun, 2 Aug 2015 00:18:49 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r286169 - head/cddl/contrib/opensolaris/lib/libdtrace/common X-SVN-Group: head 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: 2.1.20 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: Sun, 02 Aug 2015 00:18:49 -0000 Author: markj Date: Sun Aug 2 00:18:48 2015 New Revision: 286169 URL: https://svnweb.freebsd.org/changeset/base/286169 Log: Perform bounds checking when constructing a format string. This was detected by the FORTIFY_SOURCE build. PR: 201657 Reported by: pfg MFC after: 2 weeks Modified: head/cddl/contrib/opensolaris/lib/libdtrace/common/dt_printf.c Modified: head/cddl/contrib/opensolaris/lib/libdtrace/common/dt_printf.c ============================================================================== --- head/cddl/contrib/opensolaris/lib/libdtrace/common/dt_printf.c Sun Aug 2 00:15:52 2015 (r286168) +++ head/cddl/contrib/opensolaris/lib/libdtrace/common/dt_printf.c Sun Aug 2 00:18:48 2015 (r286169) @@ -1348,6 +1348,7 @@ dt_printf_format(dtrace_hdl_t *dtp, FILE dtrace_aggdesc_t *agg; caddr_t lim = (caddr_t)buf + len, limit; char format[64] = "%"; + size_t ret; int i, aggrec, curagg = -1; uint64_t normal; @@ -1379,7 +1380,9 @@ dt_printf_format(dtrace_hdl_t *dtp, FILE int prec = pfd->pfd_prec; int rval; + const char *start; char *f = format + 1; /* skip initial '%' */ + size_t fmtsz = sizeof(format) - 1; const dtrace_recdesc_t *rec; dt_pfprint_f *func; caddr_t addr; @@ -1536,6 +1539,7 @@ dt_printf_format(dtrace_hdl_t *dtp, FILE break; } + start = f; if (pfd->pfd_flags & DT_PFCONV_ALT) *f++ = '#'; if (pfd->pfd_flags & DT_PFCONV_ZPAD) @@ -1548,6 +1552,7 @@ dt_printf_format(dtrace_hdl_t *dtp, FILE *f++ = '\''; if (pfd->pfd_flags & DT_PFCONV_SPACE) *f++ = ' '; + fmtsz -= f - start; /* * If we're printing a stack and DT_PFCONV_LEFT is set, we @@ -1558,13 +1563,20 @@ dt_printf_format(dtrace_hdl_t *dtp, FILE if (func == pfprint_stack && (pfd->pfd_flags & DT_PFCONV_LEFT)) width = 0; - if (width != 0) - f += snprintf(f, sizeof (format), "%d", ABS(width)); + if (width != 0) { + ret = snprintf(f, fmtsz, "%d", ABS(width)); + f += ret; + fmtsz = MAX(0, fmtsz - ret); + } - if (prec > 0) - f += snprintf(f, sizeof (format), ".%d", prec); + if (prec > 0) { + ret = snprintf(f, fmtsz, ".%d", prec); + f += ret; + fmtsz = MAX(0, fmtsz - ret); + } - (void) strcpy(f, pfd->pfd_fmt); + if (strlcpy(f, pfd->pfd_fmt, fmtsz) >= fmtsz) + return (dt_set_errno(dtp, EDT_COMPILER)); pfd->pfd_rec = rec; if (func(dtp, fp, format, pfd, addr, size, normal) < 0)