From patchwork Mon Aug 24 08:30:45 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 264974 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-10.7 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2D9FAC433E1 for ; Mon, 24 Aug 2020 09:52:35 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id F2DB82075B for ; Mon, 24 Aug 2020 09:52:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1598262755; bh=FHuqGYt9PkW0yhIUAUqjGzka7TWB2CLzxU6+I4s4Uao=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=kC2VhgzR8+ydWONImp59wgjIGV8id0A9wgjyS8/VzBZjXUTRjMue7/x/6mCWPwF2y WI0iub/AkclAvAoWbTQ5ACLFUWhBpwF35V1tG2PxaFTfsILXoQa53TAPw1TfQyQun6 AfSixojo7zG1r3lXq32TrOezdE8tM1UD4HFn17gc= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729269AbgHXJwd (ORCPT ); Mon, 24 Aug 2020 05:52:33 -0400 Received: from mail.kernel.org ([198.145.29.99]:53594 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727838AbgHXIin (ORCPT ); Mon, 24 Aug 2020 04:38:43 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 007482177B; Mon, 24 Aug 2020 08:38:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1598258323; bh=FHuqGYt9PkW0yhIUAUqjGzka7TWB2CLzxU6+I4s4Uao=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=eJlpLk/0ovcFkFji45on960UdUCwK/FBJ7RrUnPUyW3yzxKqiVMy9x5Loq8mQpkUo y87Lvx/ldW4VDsHVRjz9ZbQddkJVMWJC8aLNY9yBqRtxzqqJskbdSARXcNVtzvZI9k JzqpqQ4so+NuZj1CbsBdQmQqsUX1hojb1u8swQ3w= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Arvind Sankar , Ard Biesheuvel Subject: [PATCH 5.8 147/148] efi/libstub: Handle unterminated cmdline Date: Mon, 24 Aug 2020 10:30:45 +0200 Message-Id: <20200824082421.065889947@linuxfoundation.org> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200824082413.900489417@linuxfoundation.org> References: <20200824082413.900489417@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Arvind Sankar commit 8a8a3237a78cbc0557f0eb16a89f16d616323e99 upstream. Make the command line parsing more robust, by handling the case it is not NUL-terminated. Use strnlen instead of strlen, and make sure that the temporary copy is NUL-terminated before parsing. Cc: Signed-off-by: Arvind Sankar Link: https://lore.kernel.org/r/20200813185811.554051-4-nivedita@alum.mit.edu Signed-off-by: Ard Biesheuvel Signed-off-by: Greg Kroah-Hartman --- drivers/firmware/efi/libstub/efi-stub-helper.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) --- a/drivers/firmware/efi/libstub/efi-stub-helper.c +++ b/drivers/firmware/efi/libstub/efi-stub-helper.c @@ -194,12 +194,14 @@ efi_status_t efi_parse_options(char cons if (!cmdline) return EFI_SUCCESS; - len = strlen(cmdline) + 1; + len = strnlen(cmdline, COMMAND_LINE_SIZE - 1) + 1; status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, len, (void **)&buf); if (status != EFI_SUCCESS) return status; - str = skip_spaces(memcpy(buf, cmdline, len)); + memcpy(buf, cmdline, len - 1); + buf[len - 1] = '\0'; + str = skip_spaces(buf); while (*str) { char *param, *val;