From nobody Mon Feb 9 15:46:08 2026 Delivered-To: importer@patchew.org Received-SPF: pass (zoho.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Authentication-Results: mx.zohomail.com; spf=pass (zoho.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail(p=none dis=none) header.from=redhat.com ARC-Seal: i=1; a=rsa-sha256; t=1557857299; cv=none; d=zoho.com; s=zohoarc; b=lza4FlQRhOjIMLYGA/GPZ6Phdii/QVCapwlLDtIojanOfGMamGcDuL1TJRj6pNNf1PyOZtAVl04t+Q4pBT/+LnyXZApQxQGrhw5JjS3nBUOcHbpC1zRpls0tWK0KOovq/JQfz935PKazNqV08wvBXAOnm0LxwGZ6uvna1lM8pS8= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zoho.com; s=zohoarc; t=1557857299; h=Content-Type:Content-Transfer-Encoding:Cc:Date:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:To:ARC-Authentication-Results; bh=puSN+X3K7R7dOsMn5Q4Z7M6Kh4ol2xsugx53bHfl2Xs=; b=LjUjm8dEuT++vNvPLEvk7IjXtVYpGSktKtM/vF40rvatcaaow1qdqESTfelYyGPk52UXZ+Zm9v49m9qSVE4vHeYiwymtwY1Dw/NT+PEIgbpON1jNfhJMPf8m0QaFvWuu3jbMnjO8RsMpTaTGohYHthBnGVoxQAgSc9AmCItIpt0= ARC-Authentication-Results: i=1; mx.zoho.com; spf=pass (zoho.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail header.from= (p=none dis=none) header.from= Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1557857299438984.0342730662817; Tue, 14 May 2019 11:08:19 -0700 (PDT) Received: from localhost ([127.0.0.1]:52050 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1hQbqZ-0006Q5-EX for importer@patchew.org; Tue, 14 May 2019 14:08:15 -0400 Received: from eggs.gnu.org ([209.51.188.92]:33196) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1hQblp-00031u-26 for qemu-devel@nongnu.org; Tue, 14 May 2019 14:03:21 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1hQblo-0002a1-5o for qemu-devel@nongnu.org; Tue, 14 May 2019 14:03:20 -0400 Received: from mx1.redhat.com ([209.132.183.28]:30373) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1hQblo-0002ZM-0a for qemu-devel@nongnu.org; Tue, 14 May 2019 14:03:20 -0400 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.phx2.redhat.com [10.5.11.14]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 5B137309B15C for ; Tue, 14 May 2019 18:03:19 +0000 (UTC) Received: from blackfin.pond.sub.org (ovpn-116-28.ams2.redhat.com [10.36.116.28]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 7EAC45D72A; Tue, 14 May 2019 18:03:16 +0000 (UTC) Received: by blackfin.pond.sub.org (Postfix, from userid 1000) id 001D011385D0; Tue, 14 May 2019 20:03:11 +0200 (CEST) From: Markus Armbruster To: qemu-devel@nongnu.org Date: Tue, 14 May 2019 20:03:08 +0200 Message-Id: <20190514180311.16028-4-armbru@redhat.com> In-Reply-To: <20190514180311.16028-1-armbru@redhat.com> References: <20190514180311.16028-1-armbru@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.49]); Tue, 14 May 2019 18:03:19 +0000 (UTC) Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 209.132.183.28 Subject: [Qemu-devel] [PATCH v2 3/6] gdbstub: Reject invalid RLE repeat counts X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: thuth@redhat.com, philmd@redhat.com Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" Content-Type: text/plain; charset="utf-8" "Debugging with GDB / Appendix E GDB Remote Serial Protocol / Overview" specifies "The printable characters '#' and '$' or with a numeric value greater than 126 must not be used." gdb_read_byte() only rejects values < 32. This is wrong. Impact depends on the caller: * gdb_handlesig() passes a char. Incorrectly accepts '#', '$' and '\127'. * gdb_chr_receive() passes an uint8_t. Additionally accepts characters with the most-significant bit set. Correct the validity check to match the specification. Signed-off-by: Markus Armbruster Reviewed-by: Philippe Mathieu-Daud=C3=A9 --- gdbstub.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/gdbstub.c b/gdbstub.c index d54abd17cc..c41eb1de07 100644 --- a/gdbstub.c +++ b/gdbstub.c @@ -2064,7 +2064,11 @@ static void gdb_read_byte(GDBState *s, int ch) } break; case RS_GETLINE_RLE: - if (ch < ' ') { + /* + * Run-length encoding is explained in "Debugging with GDB / + * Appendix E GDB Remote Serial Protocol / Overview". + */ + if (ch < ' ' || ch =3D=3D '#' || ch =3D=3D '$' || ch > 126) { /* invalid RLE count encoding */ trace_gdbstub_err_invalid_repeat((uint8_t)ch); s->state =3D RS_GETLINE; --=20 2.17.2