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 kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 58AC6C3DA7F for ; Thu, 15 Aug 2024 16:32:03 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id BBC536B016A; Thu, 15 Aug 2024 12:32:02 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id B6B8E6B016B; Thu, 15 Aug 2024 12:32:02 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id A59BC6B016C; Thu, 15 Aug 2024 12:32:02 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0013.hostedemail.com [216.40.44.13]) by kanga.kvack.org (Postfix) with ESMTP id 7F1336B016A for ; Thu, 15 Aug 2024 12:32:02 -0400 (EDT) Received: from smtpin22.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay03.hostedemail.com (Postfix) with ESMTP id 29493A15AB for ; Thu, 15 Aug 2024 16:32:02 +0000 (UTC) X-FDA: 82455021684.22.697813C Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by imf23.hostedemail.com (Postfix) with ESMTP id 99124140008 for ; Thu, 15 Aug 2024 16:31:59 +0000 (UTC) Authentication-Results: imf23.hostedemail.com; dkim=none; spf=pass (imf23.hostedemail.com: domain of Dave.Martin@arm.com designates 217.140.110.172 as permitted sender) smtp.mailfrom=Dave.Martin@arm.com; dmarc=pass (policy=none) header.from=arm.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1723739446; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=F4amGO8mOa+QkkiuatPGel8U1wodPg720SxUM3LB7Os=; b=OusA+avEFC7nGTWz7zTSdQm6XEnoT1n3q5RrLZCVJERidFnvVagKmw4m3wKQrEU9uoFTRM xy1THtpYAKfj/PKfzcNM51RO2QbrCWULG9hZlHGpdgQPtKOirHwFaE9rvrYcUVf9pTnyDt hmu8qydr0CAsiMCl9n1tq+ZCq8OGwAQ= ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1723739446; a=rsa-sha256; cv=none; b=ykbeBeqkSVul5G/TeCBR/xpK4xdSfWsKjhRMufFCVwx8hcTgN6NPEq1t8hK9H2cKGVFaIq Uqb8nCq2RSH1x/JOLLLd8AhAP4755gg/YPEYmznmKnmdeTleGTwLqqqYBVCHtiFtNNHaH8 vrOGVyHK2zfzVE6oERvLKm/F1IOPLCY= ARC-Authentication-Results: i=1; imf23.hostedemail.com; dkim=none; spf=pass (imf23.hostedemail.com: domain of Dave.Martin@arm.com designates 217.140.110.172 as permitted sender) smtp.mailfrom=Dave.Martin@arm.com; dmarc=pass (policy=none) header.from=arm.com 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 47EB014BF; Thu, 15 Aug 2024 09:32:24 -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 94A073F6A8; Thu, 15 Aug 2024 09:31:52 -0700 (PDT) Date: Thu, 15 Aug 2024 17:31:49 +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> <7fa96f26-5bf6-490f-8986-258033fbfe0e@sirena.org.uk> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <7fa96f26-5bf6-490f-8986-258033fbfe0e@sirena.org.uk> X-Stat-Signature: nc85owmqkphfewrc55tie4r1qa35nprb X-Rspamd-Queue-Id: 99124140008 X-Rspam-User: X-Rspamd-Server: rspam08 X-HE-Tag: 1723739519-216049 X-HE-Meta: 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 oTqnhQrH Ddt+V0KmZXWbhb+fD4RZ3jYAeLJzRnGaLCnYm6tnhy4l1FipO8JjtNY55NhYc3K9kjQTAqKofScDiT7FijTmMgy/qNaJ80sRAuGY8SaJj6WiS4al+zLqvSVk2VvwYk7Ar7xdfkMZGkUsUAd3Z1Dv4AXlxpt1fGtmrdrzkNczk1ffzXRU79Ch/xQDGvmg2vDAUMI7EO65t7MaGHNBCTpkeHfzrng== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Thu, Aug 15, 2024 at 04:29:54PM +0100, Mark Brown wrote: > On Thu, Aug 15, 2024 at 04:11:56PM +0100, Dave Martin wrote: > > 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? > > No, it's expected to work - I'm just not specifically aware of an > explicit test for it. Possibly some of the userspace bringup work > might've covered it? Any libc tests for altstack support should've > exercised it for example. That's true; if libc is built to use shadow stack, generic API tests ought to cover this. > > Maybe I'll hacking up a test if I get around to it, but don't take this > > as a promise! > > Thanks for your firm commitment! :P No problem... Cheers ---Dave