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=-10.0 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=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 620E3C433E1 for ; Mon, 3 Aug 2020 12:44:45 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 411D32076E for ; Mon, 3 Aug 2020 12:44:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1596458685; bh=ILED36g7XK7OsIw9mWBl8jjwQQwW/mGNlEfD6N8GLFI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=2Wa0Lrt0i15kqncgyo8Ow6WflbNxZw4VCjXR/wWGffVrIZmopyboSW03eGHsKPGco T/Vgll62c0bZ1UMy9Yv+XswQUVI9Sl7baAI1qHmk2f2WelIn3tyA/A5fcX902iF3CS fvHGH+79pw8c5r9TIg8kXtIg9/PKr6zYNiWXXfRQ= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728654AbgHCM14 (ORCPT ); Mon, 3 Aug 2020 08:27:56 -0400 Received: from mail.kernel.org ([198.145.29.99]:53826 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728649AbgHCM14 (ORCPT ); Mon, 3 Aug 2020 08:27:56 -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 8DDF7204EC; Mon, 3 Aug 2020 12:27:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1596457675; bh=ILED36g7XK7OsIw9mWBl8jjwQQwW/mGNlEfD6N8GLFI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ftgA9+R9HzA6OPzjpKJJnpZt9nQRCfSQeAtQu6IWKxq3bOAG7zsdI4dYsCGYraG4B 1JyBPrw4vaze2YCU+srzzEwnyS0Q6S56XXcWPIvENV7uff5Th9tVkFmdxFd2ENUl3r j+zSLeDtrMLJU7od3k25px50h4pge+9+i5BuWcbk= 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 5.4 26/90] drm/amdgpu: Prevent kernel-infoleak in amdgpu_info_ioctl() Date: Mon, 3 Aug 2020 14:18:48 +0200 Message-Id: <20200803121858.892244197@linuxfoundation.org> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200803121857.546052424@linuxfoundation.org> References: <20200803121857.546052424@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@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 @@ -667,9 +667,10 @@ 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; uint64_t vm_size; + 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;