From nobody Fri Sep 5 20:15:07 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 0F0A3C32792 for ; Tue, 23 Aug 2022 12:06:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1359401AbiHWMFq (ORCPT ); Tue, 23 Aug 2022 08:05:46 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47694 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1359293AbiHWMBG (ORCPT ); Tue, 23 Aug 2022 08:01:06 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4176ED8E2A; Tue, 23 Aug 2022 02:35:30 -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 434EC612D6; Tue, 23 Aug 2022 09:34:35 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 35B0DC433C1; Tue, 23 Aug 2022 09:34:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1661247274; bh=19IgdIE9ZrUrSbXsW+/oPm9vunuXvHYium+mpiIAJ+g=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=KhXvfOrn2tLD0b199fhBH7qRsvwmmLV4MKoFzeU8JpkPOCDWUjZcw1KT5TrR2tfZf dFZ0VuWmBOjJWXY++vYixt9Q8LU5k6ojI15Sr4JCyBF/yZW+g4SQYHUK81hQt26a52 Wuzpz6AZBDAeb1SlsToJHo3inaGUaFLaE2P805b0= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, xctan , dram , Ruizhe Pan , Celeste Liu , Palmer Dabbelt , Sasha Levin Subject: [PATCH 5.4 374/389] riscv: mmap with PROT_WRITE but no PROT_READ is invalid Date: Tue, 23 Aug 2022 10:27:32 +0200 Message-Id: <20220823080131.179900565@linuxfoundation.org> X-Mailer: git-send-email 2.37.2 In-Reply-To: <20220823080115.331990024@linuxfoundation.org> References: <20220823080115.331990024@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: Celeste Liu [ Upstream commit 2139619bcad7ac44cc8f6f749089120594056613 ] As mentioned in Table 4.5 in RISC-V spec Volume 2 Section 4.3, write but not read is "Reserved for future use.". For now, they are not valid. In the current code, -wx is marked as invalid, but -w- is not marked as invalid. This patch refines that judgment. Reported-by: xctan Co-developed-by: dram Signed-off-by: dram Co-developed-by: Ruizhe Pan Signed-off-by: Ruizhe Pan Signed-off-by: Celeste Liu Link: https://lore.kernel.org/r/PH7PR14MB559464DBDD310E755F5B21E8CEDC9@PH7P= R14MB5594.namprd14.prod.outlook.com Signed-off-by: Palmer Dabbelt Signed-off-by: Sasha Levin --- arch/riscv/kernel/sys_riscv.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/arch/riscv/kernel/sys_riscv.c b/arch/riscv/kernel/sys_riscv.c index 12f8a7fce78b..8a7880b9c433 100644 --- a/arch/riscv/kernel/sys_riscv.c +++ b/arch/riscv/kernel/sys_riscv.c @@ -18,9 +18,8 @@ static long riscv_sys_mmap(unsigned long addr, unsigned l= ong len, if (unlikely(offset & (~PAGE_MASK >> page_shift_offset))) return -EINVAL; =20 - if ((prot & PROT_WRITE) && (prot & PROT_EXEC)) - if (unlikely(!(prot & PROT_READ))) - return -EINVAL; + if (unlikely((prot & PROT_WRITE) && !(prot & PROT_READ))) + return -EINVAL; =20 return ksys_mmap_pgoff(addr, len, prot, flags, fd, offset >> (PAGE_SHIFT - page_shift_offset)); --=20 2.35.1