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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9CB12C4332F for ; Wed, 20 Apr 2022 00:43:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1358627AbiDTAqU (ORCPT ); Tue, 19 Apr 2022 20:46:20 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58796 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1358628AbiDTAqT (ORCPT ); Tue, 19 Apr 2022 20:46:19 -0400 Received: from relay8-d.mail.gandi.net (relay8-d.mail.gandi.net [217.70.183.201]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6B3C82C117; Tue, 19 Apr 2022 17:43:34 -0700 (PDT) Received: (Authenticated sender: joao@overdrivepizza.com) by mail.gandi.net (Postfix) with ESMTPSA id E24A91BF205; Wed, 20 Apr 2022 00:43:27 +0000 (UTC) From: joao@overdrivepizza.com To: linux-kernel@vger.kernel.org, linux-hardening@vger.kernel.org Cc: joao@overdrivepizza.com, peterz@infradead.org, jpoimboe@redhat.com, andrew.cooper3@citrix.com, keescook@chromium.org, samitolvanen@google.com, mark.rutland@arm.com, hjl.tools@gmail.com, alyssa.milburn@linux.intel.com, ndesaulniers@google.com, gabriel.gomes@linux.intel.com, rick.p.edgecombe@intel.com Subject: [RFC PATCH 07/11] x86/lib: Prevent UACCESS call warning from objtool Date: Tue, 19 Apr 2022 17:42:37 -0700 Message-Id: <20220420004241.2093-8-joao@overdrivepizza.com> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220420004241.2093-1-joao@overdrivepizza.com> References: <20220420004241.2093-1-joao@overdrivepizza.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-hardening@vger.kernel.org From: Joao Moreira Objtool emits a warning whenever it finds a call that may happen with UACCESS enabled. Prevent this b not emitting calls to the __fineibt_handler in such circumstances, making the function coarse-grained. Signed-off-by: Joao Moreira --- arch/x86/lib/copy_mc.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/x86/lib/copy_mc.c b/arch/x86/lib/copy_mc.c index 80efd45a7761..554e6c6ecea2 100644 --- a/arch/x86/lib/copy_mc.c +++ b/arch/x86/lib/copy_mc.c @@ -22,7 +22,7 @@ void enable_copy_mc_fragile(void) * Similar to copy_user_handle_tail, probe for the write fault point, or * source exception point. */ -__visible notrace unsigned long +__visible notrace unsigned long __coarseendbr copy_mc_fragile_handle_tail(char *to, char *from, unsigned len) { for (; len; --len, to++, from++) -- 2.35.1