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=-6.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,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 BFB9CC433E0 for ; Mon, 1 Jun 2020 18:18:34 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9B97E2068D for ; Mon, 1 Jun 2020 18:18:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1591035514; bh=Ns5X64qYx6T9/KIhZSJGX28kOwogjGNMcAh17sqAU/k=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=RcQv/ov3u9vFfREOfT6knLeQb5JggF/VDIgMP5ghBr5MTUMV1bus+nXHMgzaTt+89 UsYPn7HKUtXkz27M4HX9xJmrF56F1dJukCxZppMcyNQRRQFqOvGvX9vHWCdUQwiaY8 EJkfevD/TaMHKNjYQuokibPE/qlVVEtByGEmD/2I= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731662AbgFASSe (ORCPT ); Mon, 1 Jun 2020 14:18:34 -0400 Received: from mail.kernel.org ([198.145.29.99]:39644 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731894AbgFASSF (ORCPT ); Mon, 1 Jun 2020 14:18:05 -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 6A5562068D; Mon, 1 Jun 2020 18:18:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1591035484; bh=Ns5X64qYx6T9/KIhZSJGX28kOwogjGNMcAh17sqAU/k=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=qtU7uWa/HVL2NF0ZYgneleNqkP3lESa1OKyize0q11c3OTRw5vV4jtgdryi/7toyD E/AwfH5A9NGTxUFN8sH8NzK97xoMz+7f092OQ4VZZh+TeF9UPvO1A2sejU1xHrzNhy PQMcsywDqNQE8RddPQ9UMffadNvkOnGYwr+0ztu0= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Petr Mladek , Daniel Borkmann , Michael Ellerman Subject: [PATCH 5.6 173/177] powerpc/bpf: Enable bpf_probe_read{, str}() on powerpc again Date: Mon, 1 Jun 2020 19:55:11 +0200 Message-Id: <20200601174102.468155104@linuxfoundation.org> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200601174048.468952319@linuxfoundation.org> References: <20200601174048.468952319@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: Petr Mladek commit d195b1d1d1196681ac4775e0361e9cca70f740c2 upstream. The commit 0ebeea8ca8a4d1d453a ("bpf: Restrict bpf_probe_read{, str}() only to archs where they work") caused that bpf_probe_read{, str}() functions were not longer available on architectures where the same logical address might have different content in kernel and user memory mapping. These architectures should use probe_read_{user,kernel}_str helpers. For backward compatibility, the problematic functions are still available on architectures where the user and kernel address spaces are not overlapping. This is defined CONFIG_ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE. At the moment, these backward compatible functions are enabled only on x86_64, arm, and arm64. Let's do it also on powerpc that has the non overlapping address space as well. Fixes: 0ebeea8ca8a4 ("bpf: Restrict bpf_probe_read{, str}() only to archs where they work") Signed-off-by: Petr Mladek Signed-off-by: Daniel Borkmann Acked-by: Michael Ellerman Link: https://lore.kernel.org/lkml/20200527122844.19524-1-pmladek@suse.com Signed-off-by: Greg Kroah-Hartman --- arch/powerpc/Kconfig | 1 + 1 file changed, 1 insertion(+) --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -125,6 +125,7 @@ config PPC select ARCH_HAS_MMIOWB if PPC64 select ARCH_HAS_PHYS_TO_DMA select ARCH_HAS_PMEM_API + select ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE select ARCH_HAS_PTE_DEVMAP if PPC_BOOK3S_64 select ARCH_HAS_PTE_SPECIAL select ARCH_HAS_MEMBARRIER_CALLBACKS