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=-10.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,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 9D754CA9EB9 for ; Sat, 26 Oct 2019 13:24:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 6E0D6214DA for ; Sat, 26 Oct 2019 13:24:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1572096291; bh=Z0gJqVSw8i32n2tCE6mp7fBTu8mTRvdwkrK+E9IxKU4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=apdBuv2jLIlzBWZDCkuitFQI+GCrn7u7JnVsWNV3GbEA0KHD6VL+8NFmgcVrSsB0p zog0yWTgz+H52kRMGEf62LWCbuXoyROrOmelbW/e9cp+ws4rHWy3viTNFcgr6iFVxw oXuXHXu7WtYp34dICNSTrccBt70n6yb3deWZ/7BY= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729527AbfJZNWx (ORCPT ); Sat, 26 Oct 2019 09:22:53 -0400 Received: from mail.kernel.org ([198.145.29.99]:44626 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729508AbfJZNWu (ORCPT ); Sat, 26 Oct 2019 09:22:50 -0400 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 3A89E2070B; Sat, 26 Oct 2019 13:22:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1572096169; bh=Z0gJqVSw8i32n2tCE6mp7fBTu8mTRvdwkrK+E9IxKU4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=B3tn4Wa68kQGZgRI7L6uyB1VgTEgBipTxMr2evZl/rz5gs6a3cZ/PuAGUkUt0u9GD cV5WJfH/dXDZOm8JoGGoWvyeAvkbJ9goG79Wr1VhAvVvP9UnT4NDtbQAylzWbW76GF KOao8K1r2+dgDakVCZLu6OesWq6d/pMyb4fmZi4Q= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Al Viro , Max Filippov , Sasha Levin , linux-xtensa@linux-xtensa.org Subject: [PATCH AUTOSEL 4.9 16/21] xtensa: fix {get,put}_user() for 64bit values Date: Sat, 26 Oct 2019 09:22:12 -0400 Message-Id: <20191026132217.4380-16-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20191026132217.4380-1-sashal@kernel.org> References: <20191026132217.4380-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Al Viro [ Upstream commit 6595d144decec396bf2e2efee27e50634a4b627f ] First of all, on short copies __copy_{to,from}_user() return the amount of bytes left uncopied, *not* -EFAULT. get_user() and put_user() are expected to return -EFAULT on failure. Another problem is get_user(v32, (__u64 __user *)p); that should fetch 64bit value and the assign it to v32, truncating it in process. Current code, OTOH, reads 8 bytes of data and stores them at the address of v32, stomping on the 4 bytes that follow v32 itself. Signed-off-by: Al Viro Signed-off-by: Max Filippov Signed-off-by: Sasha Levin --- arch/xtensa/include/asm/uaccess.h | 13 +++++++++++-- 1 file changed, 11 insertions(+), 2 deletions(-) diff --git a/arch/xtensa/include/asm/uaccess.h b/arch/xtensa/include/asm/uaccess.h index 848a3d736bcbf..20b818db377d7 100644 --- a/arch/xtensa/include/asm/uaccess.h +++ b/arch/xtensa/include/asm/uaccess.h @@ -104,7 +104,7 @@ do { \ case 4: __put_user_asm(x, ptr, retval, 4, "s32i", __cb); break; \ case 8: { \ __typeof__(*ptr) __v64 = x; \ - retval = __copy_to_user(ptr, &__v64, 8); \ + retval = __copy_to_user(ptr, &__v64, 8) ? -EFAULT : 0; \ break; \ } \ default: __put_user_bad(); \ @@ -203,7 +203,16 @@ do { \ case 1: __get_user_asm(x, ptr, retval, 1, "l8ui", __cb); break;\ case 2: __get_user_asm(x, ptr, retval, 2, "l16ui", __cb); break;\ case 4: __get_user_asm(x, ptr, retval, 4, "l32i", __cb); break;\ - case 8: retval = __copy_from_user(&x, ptr, 8); break; \ + case 8: { \ + u64 __x; \ + if (unlikely(__copy_from_user(&__x, ptr, 8))) { \ + retval = -EFAULT; \ + (x) = 0; \ + } else { \ + (x) = *(__force __typeof__((ptr)))&__x; \ + } \ + break; \ + } \ default: (x) = __get_user_bad(); \ } \ } while (0) -- 2.20.1