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 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 00309C52D7C for ; Thu, 15 Aug 2024 15:13:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:In-Reply-To:Content-Type: MIME-Version:References:Message-ID:Subject:Cc:To:From:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=4DmGpctHNq9DzZVdffp0n6VPJ3MvCHhsf4vFKOcypiM=; b=zMEGX9PaWQRHBwH/VgbEPt16fC 28gzSxEWtlMtvL7VK5yDTa98QfIhrqRv+Vhq6mg8VGe7Ew/QHFBYWmU9KP3hpNzwijCvOmjQ0mPvc JPzTb70OjrX4ZrfSyxZFD1Be0wmgZUqoIPZXOqzvkBukMZ6tv+nY59UGgzmpKia3MWDoep+0pS2wH TzCzES2s0ewbCt+Xj4PieDQ575vsc+bqSM/O8fJRDLaAQaL4XXCk02myCDknkUXNE7ZnOHk/x2j8M i/yYZHHxIqD4g78AUIfcZY90hPzmUdzpfA0x3Xbv4YKpPyntyCybYbSH+BxrF2hCj6blrgYDL4XuK 4vsOQX8A==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1sec9l-0000000AKsO-1qic; Thu, 15 Aug 2024 15:12:53 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1sec90-0000000AKcH-30hI; Thu, 15 Aug 2024 15:12:12 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 5AAE414BF; Thu, 15 Aug 2024 08:12:31 -0700 (PDT) Received: from e133380.arm.com (e133380.arm.com [10.1.197.55]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 3A5563F58B; Thu, 15 Aug 2024 08:11:59 -0700 (PDT) Date: Thu, 15 Aug 2024 16:11:56 +0100 From: Dave Martin To: Mark Brown Cc: Catalin Marinas , Will Deacon , Jonathan Corbet , Andrew Morton , Marc Zyngier , Oliver Upton , James Morse , Suzuki K Poulose , Arnd Bergmann , Oleg Nesterov , Eric Biederman , Shuah Khan , "Rick P. Edgecombe" , Deepak Gupta , Ard Biesheuvel , Szabolcs Nagy , Kees Cook , "H.J. Lu" , Paul Walmsley , Palmer Dabbelt , Albert Ou , Florian Weimer , Christian Brauner , Thiago Jung Bauermann , Ross Burton , linux-arm-kernel@lists.infradead.org, linux-doc@vger.kernel.org, kvmarm@lists.linux.dev, linux-fsdevel@vger.kernel.org, linux-arch@vger.kernel.org, linux-mm@kvack.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org Subject: Re: [PATCH v10 23/40] arm64/signal: Set up and restore the GCS context for signal handlers Message-ID: References: <20240801-arm64-gcs-v10-0-699e2bd2190b@kernel.org> <20240801-arm64-gcs-v10-23-699e2bd2190b@kernel.org> <08932f6d-01ef-40e8-97d2-08f0d2016191@sirena.org.uk> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240815_081206_817795_E42379FD X-CRM114-Status: GOOD ( 14.58 ) 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: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Thu, Aug 15, 2024 at 03:45:45PM +0100, Mark Brown wrote: > On Thu, Aug 15, 2024 at 02:37:22PM +0100, Dave Martin wrote: > > > Is there a test for taking and returning from a signal on an alternate > > (main) stack, when a shadow stack is in use? Sounds like something > > that would be good to check if not. > > Not specifically for any of the architectures. Can you see any reason why this shouldn't work? Maybe I'll hacking up a test if I get around to it, but don't take this as a promise! Cheers ---Dave