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=-9.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, 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 D927AC43218 for ; Sat, 27 Apr 2019 01:46:01 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id AB5C0208CB for ; Sat, 27 Apr 2019 01:46:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1556329561; bh=W833+W8Ifaexwu9fiY0Cg6R/UBNeW2zwa2C8uJQ/lvY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=DHIB9USbxAOJlbxXo14HjW6+o2EvRvEXw0ECoXm82Z3d2piiRTQSZalY1VCYyaZ78 A+451B5K2QCI6N8QIY85ztXAHWMFjyp+aKr1M4HHE0/KMFOsAwt7mbT2q9Xw4pLjD1 GmzHgHTRO1OFzj6uU4qq5Jfv2qb8OMS+LIOjIUso= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728843AbfD0Bnp (ORCPT ); Fri, 26 Apr 2019 21:43:45 -0400 Received: from mail.kernel.org ([198.145.29.99]:47920 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727609AbfD0Bnm (ORCPT ); Fri, 26 Apr 2019 21:43:42 -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 5F7AA215EA; Sat, 27 Apr 2019 01:43:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1556329422; bh=W833+W8Ifaexwu9fiY0Cg6R/UBNeW2zwa2C8uJQ/lvY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=A/IHsmG9fMTh91uu6oHJv4W1PS3m/E/S/C1g9uQ2+zT9vhm444UwWdwPhw3lTGtgC +61Lot3gsTWRNqcuxUjl8CWzdY3Z/EmiaIgtcSr0/mPukR/qYxFGGE0ltYFHD3ckr3 +ijss0B9YwOC6Jxyv3eTWfD3oEAk/Dfs3Ik5LO1M= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Jann Horn , Borislav Petkov , Andrei Vagin , Andrew Morton , Dan Carpenter , Greg Kroah-Hartman , "H. Peter Anvin" , Ingo Molnar , Jani Nikula , Kees Cook , Masahiro Yamada , NeilBrown , Peter Zijlstra , Qiaowei Ren , Thomas Gleixner , x86-ml , Sasha Levin Subject: [PATCH AUTOSEL 4.9 09/16] linux/kernel.h: Use parentheses around argument in u64_to_user_ptr() Date: Fri, 26 Apr 2019 21:43:17 -0400 Message-Id: <20190427014325.8704-9-sashal@kernel.org> X-Mailer: git-send-email 2.19.1 In-Reply-To: <20190427014325.8704-1-sashal@kernel.org> References: <20190427014325.8704-1-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: Jann Horn [ Upstream commit a0fe2c6479aab5723239b315ef1b552673f434a3 ] Use parentheses around uses of the argument in u64_to_user_ptr() to ensure that the cast doesn't apply to part of the argument. There are existing uses of the macro of the form u64_to_user_ptr(A + B) which expands to (void __user *)(uintptr_t)A + B (the cast applies to the first operand of the addition, the addition is a pointer addition). This happens to still work as intended, the semantic difference doesn't cause a difference in behavior. But I want to use u64_to_user_ptr() with a ternary operator in the argument, like so: u64_to_user_ptr(A ? B : C) This currently doesn't work as intended. Signed-off-by: Jann Horn Signed-off-by: Borislav Petkov Reviewed-by: Mukesh Ojha Cc: Andrei Vagin Cc: Andrew Morton Cc: Dan Carpenter Cc: Greg Kroah-Hartman Cc: "H. Peter Anvin" Cc: Ingo Molnar Cc: Jani Nikula Cc: Kees Cook Cc: Masahiro Yamada Cc: NeilBrown Cc: Peter Zijlstra Cc: Qiaowei Ren Cc: Thomas Gleixner Cc: x86-ml Link: https://lkml.kernel.org/r/20190329214652.258477-1-jannh@google.com Signed-off-by: Sasha Levin --- include/linux/kernel.h | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/include/linux/kernel.h b/include/linux/kernel.h index 61054f12be7c..d83fc669eeac 100644 --- a/include/linux/kernel.h +++ b/include/linux/kernel.h @@ -55,8 +55,8 @@ #define u64_to_user_ptr(x) ( \ { \ - typecheck(u64, x); \ - (void __user *)(uintptr_t)x; \ + typecheck(u64, (x)); \ + (void __user *)(uintptr_t)(x); \ } \ ) -- 2.19.1