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=-9.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,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 9E91FC4332D for ; Thu, 19 Mar 2020 13:28:50 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 72E1E208E4 for ; Thu, 19 Mar 2020 13:28:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1584624530; bh=qeSR8s+xjYKgRtoXDhAo+RN2PMmTP5CX+CKt41Yu3xQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=h6wuIqnyzLQldRHnWNjNbrnrwvFL8O1kT1W0jBYbJpGN3a6vqtc5uPCKyGj3nPDwU rN/01zqU7rCRGt3BsNcWsnt6Tx8A6veJ4D6zuUlQl6Mv4EeNxaYzujm6DVv3Lbxi6D 2EfT1bBHRPUa/eG5Vm1mxRNOvz16nr8SQy5sp5R0= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730702AbgCSNZ7 (ORCPT ); Thu, 19 Mar 2020 09:25:59 -0400 Received: from mail.kernel.org ([198.145.29.99]:53688 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730701AbgCSNZy (ORCPT ); Thu, 19 Mar 2020 09:25:54 -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 095912080C; Thu, 19 Mar 2020 13:25:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1584624353; bh=qeSR8s+xjYKgRtoXDhAo+RN2PMmTP5CX+CKt41Yu3xQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=oVVEtO/oWhL0+3XAd7G8LjHxZPicOF1Q5smcJGMq1tlf6WFmq4CnBj0tq+W1cTpB+ g6vE1egu07fCd8/EFmIDu0bQ6ikc4BURaaQ8Xe1DfRuNR1fJP1eNSd9RbO+4MNiQT9 fMiZwnXpfBFJaALTen1H46U98MV84bBtMxA/a2L8= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Paul Burton , Sasha Levin Subject: [PATCH 5.5 14/65] MIPS: Disable VDSO time functionality on microMIPS Date: Thu, 19 Mar 2020 14:03:56 +0100 Message-Id: <20200319123930.951581514@linuxfoundation.org> X-Mailer: git-send-email 2.25.2 In-Reply-To: <20200319123926.466988514@linuxfoundation.org> References: <20200319123926.466988514@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Paul Burton [ Upstream commit 07015d7a103c4420b69a287b8ef4d2535c0f4106 ] A check we're about to add to pick up on function calls that depend on bogus use of the GOT in the VDSO picked up on instances of such function calls in microMIPS builds. Since the code appears genuinely problematic, and given the relatively small amount of use & testing that microMIPS sees, go ahead & disable the VDSO for microMIPS builds. Signed-off-by: Paul Burton Signed-off-by: Sasha Levin --- arch/mips/vdso/Makefile | 19 +++++++++++++++++-- 1 file changed, 17 insertions(+), 2 deletions(-) diff --git a/arch/mips/vdso/Makefile b/arch/mips/vdso/Makefile index 96afd73c94e8a..e8585a22b925c 100644 --- a/arch/mips/vdso/Makefile +++ b/arch/mips/vdso/Makefile @@ -48,6 +48,8 @@ endif CFLAGS_REMOVE_vgettimeofday.o = -pg +DISABLE_VDSO := n + # # For the pre-R6 code in arch/mips/vdso/vdso.h for locating # the base address of VDSO, the linker will emit a R_MIPS_PC32 @@ -61,11 +63,24 @@ CFLAGS_REMOVE_vgettimeofday.o = -pg ifndef CONFIG_CPU_MIPSR6 ifeq ($(call ld-ifversion, -lt, 225000000, y),y) $(warning MIPS VDSO requires binutils >= 2.25) - obj-vdso-y := $(filter-out vgettimeofday.o, $(obj-vdso-y)) - ccflags-vdso += -DDISABLE_MIPS_VDSO + DISABLE_VDSO := y endif endif +# +# GCC (at least up to version 9.2) appears to emit function calls that make use +# of the GOT when targeting microMIPS, which we can't use in the VDSO due to +# the lack of relocations. As such, we disable the VDSO for microMIPS builds. +# +ifdef CONFIG_CPU_MICROMIPS + DISABLE_VDSO := y +endif + +ifeq ($(DISABLE_VDSO),y) + obj-vdso-y := $(filter-out vgettimeofday.o, $(obj-vdso-y)) + ccflags-vdso += -DDISABLE_MIPS_VDSO +endif + # VDSO linker flags. VDSO_LDFLAGS := \ -Wl,-Bsymbolic -Wl,--no-undefined -Wl,-soname=linux-vdso.so.1 \ -- 2.20.1