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=-19.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable 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 40CDFC433EF for ; Thu, 9 Sep 2021 12:11:16 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2B76F6113E for ; Thu, 9 Sep 2021 12:11:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1348499AbhIIMMU (ORCPT ); Thu, 9 Sep 2021 08:12:20 -0400 Received: from mail.kernel.org ([198.145.29.99]:42124 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1347686AbhIIMEZ (ORCPT ); Thu, 9 Sep 2021 08:04:25 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id EAE02615E6; Thu, 9 Sep 2021 11:47:03 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1631188024; bh=35atDnHr5kKPvD7ZRVCpmrxJQhwkKsyZnBkWc0xcL9g=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=E5rKJDfNZFNoEr8eXLQ/LZEm2DeefGfW+Kr4mjWkRE0T1qy+0HzKvC3KmZuXAWVR5 Hfy5F4CmXzuEhXQZgkVan//M1WfXxD/ocybztn5wLjKy4Lh5Layq7Zo9xpWJ1lN0NZ OQY98GCWV7iLgTAbUSu0JZXfBgPBrGgypooR9F8EJcxNjVvJ7V5q6dEEibqOrONUlc wpSUdwLlrnz+W8MNoi4O+aeh9etFkX3VYmKQFGidpeO+GOrOIERACdQsJ98/2U3UJ9 pEsE/Uz5MgxkPPPerapAFJV5kqpAGVb2z+XDFAtPq+QtoORfH3aeL180Tz2qH44v5Q +xLAqh/2NRv+Q== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Zheyu Ma , Sam Ravnborg , Sasha Levin , dri-devel@lists.freedesktop.org, linux-fbdev@vger.kernel.org Subject: [PATCH AUTOSEL 5.13 022/219] video: fbdev: kyro: fix a DoS bug by restricting user input Date: Thu, 9 Sep 2021 07:43:18 -0400 Message-Id: <20210909114635.143983-22-sashal@kernel.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210909114635.143983-1-sashal@kernel.org> References: <20210909114635.143983-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Zheyu Ma [ Upstream commit 98a65439172dc69cb16834e62e852afc2adb83ed ] The user can pass in any value to the driver through the 'ioctl' interface. The driver dost not check, which may cause DoS bugs. The following log reveals it: divide error: 0000 [#1] PREEMPT SMP KASAN PTI RIP: 0010:SetOverlayViewPort+0x133/0x5f0 drivers/video/fbdev/kyro/STG4000OverlayDevice.c:476 Call Trace: kyro_dev_overlay_viewport_set drivers/video/fbdev/kyro/fbdev.c:378 [inline] kyrofb_ioctl+0x2eb/0x330 drivers/video/fbdev/kyro/fbdev.c:603 do_fb_ioctl+0x1f3/0x700 drivers/video/fbdev/core/fbmem.c:1171 fb_ioctl+0xeb/0x130 drivers/video/fbdev/core/fbmem.c:1185 vfs_ioctl fs/ioctl.c:48 [inline] __do_sys_ioctl fs/ioctl.c:753 [inline] __se_sys_ioctl fs/ioctl.c:739 [inline] __x64_sys_ioctl+0x19b/0x220 fs/ioctl.c:739 do_syscall_64+0x32/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae Signed-off-by: Zheyu Ma Signed-off-by: Sam Ravnborg Link: https://patchwork.freedesktop.org/patch/msgid/1626235762-2590-1-git-send-email-zheyuma97@gmail.com Signed-off-by: Sasha Levin --- drivers/video/fbdev/kyro/fbdev.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/video/fbdev/kyro/fbdev.c b/drivers/video/fbdev/kyro/fbdev.c index 8fbde92ae8b9..4b8c7c16b1df 100644 --- a/drivers/video/fbdev/kyro/fbdev.c +++ b/drivers/video/fbdev/kyro/fbdev.c @@ -372,6 +372,11 @@ static int kyro_dev_overlay_viewport_set(u32 x, u32 y, u32 ulWidth, u32 ulHeight /* probably haven't called CreateOverlay yet */ return -EINVAL; + if (ulWidth == 0 || ulWidth == 0xffffffff || + ulHeight == 0 || ulHeight == 0xffffffff || + (x < 2 && ulWidth + 2 == 0)) + return -EINVAL; + /* Stop Ramdac Output */ DisableRamdacOutput(deviceInfo.pSTGReg); -- 2.30.2