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=-15.5 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_SANE_1 autolearn=ham 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 C98FFC433C1 for ; Fri, 26 Mar 2021 09:37:36 +0000 (UTC) Received: from desiato.infradead.org (desiato.infradead.org [90.155.92.199]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 4A03E61A3F for ; Fri, 26 Mar 2021 09:37:36 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 4A03E61A3F Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=desiato.20200630; h=Sender:Content-Transfer-Encoding :Content-Type:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References:Message-ID: Subject:Cc:To:From:Date:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=qogMBgmQ3sUSsyQJsAvwuPiBOLsriLiRUgnn22wL9zM=; b=d5h0glsFHgpwbnn2EWBzMz9hH V2TcQCz6iuiHRI22vE0Tzno3ahTcaxctP6xCSeP+AEOSDjVZlBqnwsqUwrDuAC7DEVtdyPNUe32Yc ryLLF/0QHas+YMJ814ic0kk5dedkhdjP3nexh8B4YpdwIDg5ID4p/qC5AQIVm0Jrg96NVA3lTjR9Z D/zl7C9A+oI1MTHY5Vs9+Stq+RjiI0SoHkalI0nw6Lf59OiQ1xbMjTsqIszHOKZQP/DaJRJuwhIb/ +LK/SAmmm1AZQ8dxOtzRagjY5txeXs/36hVlcHDEmQkK4uiYJ/RnoyFcMEqcvKGGBpwVpjueUN7Xq GRGthDPig==; Received: from localhost ([::1] helo=desiato.infradead.org) by desiato.infradead.org with esmtp (Exim 4.94 #2 (Red Hat Linux)) id 1lPisv-003AeL-Qz; Fri, 26 Mar 2021 09:36:05 +0000 Received: from mail.kernel.org ([198.145.29.99]) by desiato.infradead.org with esmtps (Exim 4.94 #2 (Red Hat Linux)) id 1lPisr-003Ada-3F for linux-arm-kernel@lists.infradead.org; Fri, 26 Mar 2021 09:36:03 +0000 Received: by mail.kernel.org (Postfix) with ESMTPSA id 1302961A38; Fri, 26 Mar 2021 09:35:55 +0000 (UTC) Date: Fri, 26 Mar 2021 09:35:53 +0000 From: Catalin Marinas To: Will Deacon Cc: Vladimir Murzin , linux-arm-kernel@lists.infradead.org, keescook@chromium.org, dave.martin@arm.com Subject: Re: [PATCH v4 2/2] arm64: Introduce HWCAPS2_EXECONLY Message-ID: <20210326093553.GA5126@arm.com> References: <20210312173811.58284-1-vladimir.murzin@arm.com> <20210312173811.58284-3-vladimir.murzin@arm.com> <20210325190000.GC15860@willie-the-truck> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20210325190000.GC15860@willie-the-truck> User-Agent: Mutt/1.10.1 (2018-07-13) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210326_093601_351692_AC95BE93 X-CRM114-Status: GOOD ( 14.24 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Thu, Mar 25, 2021 at 07:00:00PM +0000, Will Deacon wrote: > On Fri, Mar 12, 2021 at 05:38:11PM +0000, Vladimir Murzin wrote: > > With EPAN supported it might be handy to user know that PROT_EXEC > > gives execute-only permission, so advertise it via HWCAPS2_EXECONLY > > > > Cc: Kees Cook > > Cc: Catalin Marinas > > Signed-off-by: Vladimir Murzin > > --- > > arch/arm64/include/asm/hwcap.h | 1 + > > arch/arm64/include/asm/sysreg.h | 1 + > > arch/arm64/include/uapi/asm/hwcap.h | 1 + > > arch/arm64/kernel/cpufeature.c | 3 +++ > > arch/arm64/kernel/cpuinfo.c | 1 + > > 5 files changed, 7 insertions(+) > > I still don't see the need for this patch. Can we avoid merging it until > somebody has a use for it, please? It's more about telling user-space that the feature is present though we didn't do this last time we had exec-only permissions either. I was hoping we can do better this time. OTOH, probably no-one will check for this HWCAP anyway, so let's wait until someone asks for it. -- Catalin _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel