From mboxrd@z Thu Jan 1 00:00:00 1970 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=-9.8 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,URIBL_BLOCKED,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 E947BC433DF for ; Mon, 12 Oct 2020 13:33:37 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A6B39215A4 for ; Mon, 12 Oct 2020 13:33:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1602509617; bh=zL9izJMJB54pG1Dl+LvC5fpuv1reHJnvEC2ws5mv0Kg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=jdha+h/Jrv1gjEln8zvRfcXTRxB1vbXEDpbvPojGgOHHh37Cx3d6Zk9zBcTujCNHK 6FUMMDAJ7qJEBrwHUU3RGwm6tOfrt2BSrNfqG4rGNoxrHH2WeR2pCsX5GClJO9e6Ko HJnySlPZhNhwrDg3vHbM8FI4i7LuHwtGHcEMMYek= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389173AbgJLNdf (ORCPT ); Mon, 12 Oct 2020 09:33:35 -0400 Received: from mail.kernel.org ([198.145.29.99]:35308 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730051AbgJLNdO (ORCPT ); Mon, 12 Oct 2020 09:33:14 -0400 Received: from localhost (83-86-74-64.cable.dynamic.v4.ziggo.nl [83.86.74.64]) (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 386832074F; Mon, 12 Oct 2020 13:33:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1602509593; bh=zL9izJMJB54pG1Dl+LvC5fpuv1reHJnvEC2ws5mv0Kg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=XxgYE0FOs/WsM4fdhxcV3HWsdDB6vRfqSMQfv0qtGZ+ioefiXR3RIS5N9kvH/pfBJ jVuhLY8F50/crCX5Up4z6ASlQPRURRdFdyXnOZn60npKSZfyDC57l2FloF5nVAkLre lCqlI1uriUnL3MX8uPqaEcJKdT3L7CT4ty+WkPzw= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Peilin Ye , Daniel Vetter , syzbot+29d4ed7f3bdedf2aa2fd@syzkaller.appspotmail.com Subject: [PATCH 4.4 20/39] fbcon: Fix global-out-of-bounds read in fbcon_get_font() Date: Mon, 12 Oct 2020 15:26:50 +0200 Message-Id: <20201012132629.081507692@linuxfoundation.org> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20201012132628.130632267@linuxfoundation.org> References: <20201012132628.130632267@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Peilin Ye commit 5af08640795b2b9a940c9266c0260455377ae262 upstream. fbcon_get_font() is reading out-of-bounds. A malicious user may resize `vc->vc_font.height` to a large value, causing fbcon_get_font() to read out of `fontdata`. fbcon_get_font() handles both built-in and user-provided fonts. Fortunately, recently we have added FONT_EXTRA_WORDS support for built-in fonts, so fix it by adding range checks using FNTSIZE(). This patch depends on patch "fbdev, newport_con: Move FONT_EXTRA_WORDS macros into linux/font.h", and patch "Fonts: Support FONT_EXTRA_WORDS macros for built-in fonts". Cc: stable@vger.kernel.org Reported-and-tested-by: syzbot+29d4ed7f3bdedf2aa2fd@syzkaller.appspotmail.com Link: https://syzkaller.appspot.com/bug?id=08b8be45afea11888776f897895aef9ad1c3ecfd Signed-off-by: Peilin Ye Reviewed-by: Greg Kroah-Hartman Signed-off-by: Daniel Vetter Link: https://patchwork.freedesktop.org/patch/msgid/b34544687a1a09d6de630659eb7a773f4953238b.1600953813.git.yepeilin.cs@gmail.com Signed-off-by: Greg Kroah-Hartman --- drivers/video/console/fbcon.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) --- a/drivers/video/console/fbcon.c +++ b/drivers/video/console/fbcon.c @@ -2234,6 +2234,9 @@ static int fbcon_get_font(struct vc_data if (font->width <= 8) { j = vc->vc_font.height; + if (font->charcount * j > FNTSIZE(fontdata)) + return -EINVAL; + for (i = 0; i < font->charcount; i++) { memcpy(data, fontdata, j); memset(data + j, 0, 32 - j); @@ -2242,6 +2245,9 @@ static int fbcon_get_font(struct vc_data } } else if (font->width <= 16) { j = vc->vc_font.height * 2; + if (font->charcount * j > FNTSIZE(fontdata)) + return -EINVAL; + for (i = 0; i < font->charcount; i++) { memcpy(data, fontdata, j); memset(data + j, 0, 64 - j); @@ -2249,6 +2255,9 @@ static int fbcon_get_font(struct vc_data fontdata += j; } } else if (font->width <= 24) { + if (font->charcount * (vc->vc_font.height * sizeof(u32)) > FNTSIZE(fontdata)) + return -EINVAL; + for (i = 0; i < font->charcount; i++) { for (j = 0; j < vc->vc_font.height; j++) { *data++ = fontdata[0]; @@ -2261,6 +2270,9 @@ static int fbcon_get_font(struct vc_data } } else { j = vc->vc_font.height * 4; + if (font->charcount * j > FNTSIZE(fontdata)) + return -EINVAL; + for (i = 0; i < font->charcount; i++) { memcpy(data, fontdata, j); memset(data + j, 0, 128 - j);