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 9EE8AC433DF for ; Thu, 20 Aug 2020 10:37:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 67BFA20738 for ; Thu, 20 Aug 2020 10:37:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1597919879; bh=dEDmkRG7YeHU1IZmCwE7m7T5vhaWdxv/IdSIN41lr+4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=hDMVkEDoccrQ25DPY5XiVq4lhsilgjNBtF9xLxa2PPCk5wV6+8sDkkv62gk20npoD TJ4tdX6HgjlNT7ATv4sNQ2TsWMXoIMq6+2FyEvo1VyeVFAdcsN/mKardVW3BKR2f8Y MTBoOTSl0Rf/Ek14UzawllJhYEi7gbtI5RlPyZfI= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730403AbgHTKht (ORCPT ); Thu, 20 Aug 2020 06:37:49 -0400 Received: from mail.kernel.org ([198.145.29.99]:40936 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731382AbgHTKSa (ORCPT ); Thu, 20 Aug 2020 06:18:30 -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 A9A0620738; Thu, 20 Aug 2020 10:18:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1597918709; bh=dEDmkRG7YeHU1IZmCwE7m7T5vhaWdxv/IdSIN41lr+4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=gamUFoQ4cbau2JHPRM3ey4CfGY5Ib1jxRKM7YtW1e+UzU1FaxAWo/afj/3tYwIVK3 /Xj7m8Oq/oUZmXyeiZ5QRA/1EfvTuO91m1bRTbn/FvFGw6DmmTyb6M107Misl5yubB EuX/AyxkE/yNh/Io1VO4LXzZhjSLLMxoGl6wNlyI= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Dan Carpenter , =?UTF-8?q?Christian=20K=C3=B6nig?= , Peilin Ye , Alex Deucher Subject: [PATCH 4.4 008/149] drm/amdgpu: Prevent kernel-infoleak in amdgpu_info_ioctl() Date: Thu, 20 Aug 2020 11:21:25 +0200 Message-Id: <20200820092126.097749742@linuxfoundation.org> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200820092125.688850368@linuxfoundation.org> References: <20200820092125.688850368@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Peilin Ye commit 543e8669ed9bfb30545fd52bc0e047ca4df7fb31 upstream. Compiler leaves a 4-byte hole near the end of `dev_info`, causing amdgpu_info_ioctl() to copy uninitialized kernel stack memory to userspace when `size` is greater than 356. In 2015 we tried to fix this issue by doing `= {};` on `dev_info`, which unfortunately does not initialize that 4-byte hole. Fix it by using memset() instead. Cc: stable@vger.kernel.org Fixes: c193fa91b918 ("drm/amdgpu: information leak in amdgpu_info_ioctl()") Fixes: d38ceaf99ed0 ("drm/amdgpu: add core driver (v4)") Suggested-by: Dan Carpenter Reviewed-by: Christian König Signed-off-by: Peilin Ye Signed-off-by: Alex Deucher Signed-off-by: Greg Kroah-Hartman --- drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c @@ -428,9 +428,10 @@ static int amdgpu_info_ioctl(struct drm_ return n ? -EFAULT : 0; } case AMDGPU_INFO_DEV_INFO: { - struct drm_amdgpu_info_device dev_info = {}; + struct drm_amdgpu_info_device dev_info; struct amdgpu_cu_info cu_info; + memset(&dev_info, 0, sizeof(dev_info)); dev_info.device_id = dev->pdev->device; dev_info.chip_rev = adev->rev_id; dev_info.external_rev = adev->external_rev_id;