From nobody Fri Dec 19 18:41:42 2025 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 48B91C38A2D for ; Mon, 24 Oct 2022 13:01:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234815AbiJXNB4 (ORCPT ); Mon, 24 Oct 2022 09:01:56 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41006 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235097AbiJXM7T (ORCPT ); Mon, 24 Oct 2022 08:59:19 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E5FB99A2AC; Mon, 24 Oct 2022 05:18:36 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 531E8612DA; Mon, 24 Oct 2022 12:17:25 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 63701C433D7; Mon, 24 Oct 2022 12:17:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1666613844; bh=RLkjsXNCeD9Aft4ml7uTuapdTsXixKA/dEjOa/v5+hA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=x9MjdjA9KM/qObeu1WF3d/so3fvtkRATdxHxjy7OnnuUhnmBgDvPMS8nni7mV69Pn /kD1+DxodV849x1fsG88eqJiO6b15Uw68VLpQJVbjha0B9jmh0ipB6pv3XmNl5l3F4 zECNN902EttNzRqCNGfGTDjcPCdjkK6zgM+Ss5Wc= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Atish Patra , Andrew Bresticker , Palmer Dabbelt Subject: [PATCH 5.10 035/390] riscv: Make VM_WRITE imply VM_READ Date: Mon, 24 Oct 2022 13:27:12 +0200 Message-Id: <20221024113024.103392568@linuxfoundation.org> X-Mailer: git-send-email 2.38.1 In-Reply-To: <20221024113022.510008560@linuxfoundation.org> References: <20221024113022.510008560@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" From: Andrew Bresticker commit 7ab72c597356be1e7f0f3d856e54ce78527f43c8 upstream. RISC-V does not presently have write-only mappings as that PTE bit pattern is considered reserved in the privileged spec, so allow handling of read faults in VMAs that have VM_WRITE without VM_READ in order to be consistent with other architectures that have similar limitations. Fixes: 2139619bcad7 ("riscv: mmap with PROT_WRITE but no PROT_READ is inval= id") Reviewed-by: Atish Patra Signed-off-by: Andrew Bresticker Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/20220915193702.2201018-2-abrestic@rivosinc.= com/ Signed-off-by: Palmer Dabbelt Signed-off-by: Greg Kroah-Hartman --- arch/riscv/mm/fault.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) --- a/arch/riscv/mm/fault.c +++ b/arch/riscv/mm/fault.c @@ -167,7 +167,8 @@ static inline bool access_error(unsigned } break; case EXC_LOAD_PAGE_FAULT: - if (!(vma->vm_flags & VM_READ)) { + /* Write implies read */ + if (!(vma->vm_flags & (VM_READ | VM_WRITE))) { return true; } break;