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,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 1C9D2C7618B for ; Fri, 26 Jul 2019 13:56:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id DC605229F9 for ; Fri, 26 Jul 2019 13:56:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1564149380; bh=dA9rjTfI3ezqpl0b3sykI4tA/BBNeqQ0Y08JP8hVIyw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=g8AOmFVda1JvR5Uw+8Gc+MGIj8CqtXOheA4K0xpiMP7vx5xrfjwL+lSwgp39FSdeU VUvi1F52Zaffns/RxZEochZZJ/SoJOuanmzAHRSZdLjOeMXEgNwLduUXv5BEfBdfTt McqGpEBSmBImoDbffqXG6UV/gM1nq714qRu/AiXM= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728481AbfGZN4S (ORCPT ); Fri, 26 Jul 2019 09:56:18 -0400 Received: from mail.kernel.org ([198.145.29.99]:49036 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727558AbfGZNlz (ORCPT ); Fri, 26 Jul 2019 09:41:55 -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 CE59722CBD; Fri, 26 Jul 2019 13:41:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1564148514; bh=dA9rjTfI3ezqpl0b3sykI4tA/BBNeqQ0Y08JP8hVIyw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=uGmlVZl8XSMB0BSzWLuhfh9gXsSGgLETdAY8sOvTePaI1nTKSskBvFk5B/Ctp5nmK VdoT6+MmFT9gtlC8m3uXuC4q2zglgp0hJgbb2EYRuFD/fM95rZJrVhsNxTFbMpMteQ 6g60XOzBKcKM0jDc0PUwn06wALiuQYUFzO7Rua/w= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Josh Poimboeuf , Thomas Gleixner , Nick Desaulniers , Peter Zijlstra , Sasha Levin Subject: [PATCH AUTOSEL 5.2 77/85] objtool: Add mcsafe_handle_tail() to the uaccess safe list Date: Fri, 26 Jul 2019 09:39:27 -0400 Message-Id: <20190726133936.11177-77-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190726133936.11177-1-sashal@kernel.org> References: <20190726133936.11177-1-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: Josh Poimboeuf [ Upstream commit a7e47f26039c26312a4144c3001b4e9fa886bd45 ] After an objtool improvement, it's reporting that __memcpy_mcsafe() is calling mcsafe_handle_tail() with AC=1: arch/x86/lib/memcpy_64.o: warning: objtool: .fixup+0x13: call to mcsafe_handle_tail() with UACCESS enabled arch/x86/lib/memcpy_64.o: warning: objtool: __memcpy_mcsafe()+0x34: (alt) arch/x86/lib/memcpy_64.o: warning: objtool: __memcpy_mcsafe()+0xb: (branch) arch/x86/lib/memcpy_64.o: warning: objtool: __memcpy_mcsafe()+0x0: <=== (func) mcsafe_handle_tail() is basically an extension of __memcpy_mcsafe(), so AC=1 is supposed to be set. Add mcsafe_handle_tail() to the uaccess safe list. Signed-off-by: Josh Poimboeuf Signed-off-by: Thomas Gleixner Tested-by: Nick Desaulniers Acked-by: Peter Zijlstra (Intel) Link: https://lkml.kernel.org/r/035c38f7eac845281d3c3d36749144982e06e58c.1563413318.git.jpoimboe@redhat.com Signed-off-by: Sasha Levin --- tools/objtool/check.c | 1 + 1 file changed, 1 insertion(+) diff --git a/tools/objtool/check.c b/tools/objtool/check.c index 172f99195726..f5c3b97051a7 100644 --- a/tools/objtool/check.c +++ b/tools/objtool/check.c @@ -488,6 +488,7 @@ static const char *uaccess_safe_builtin[] = { /* misc */ "csum_partial_copy_generic", "__memcpy_mcsafe", + "mcsafe_handle_tail", "ftrace_likely_update", /* CONFIG_TRACE_BRANCH_PROFILING */ NULL }; -- 2.20.1