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 209DAC3DA4A for ; Thu, 22 Aug 2024 11:32:07 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 8547A80028; Thu, 22 Aug 2024 07:32:06 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 8017D8001E; Thu, 22 Aug 2024 07:32:06 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 6546E80028; Thu, 22 Aug 2024 07:32:06 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0011.hostedemail.com [216.40.44.11]) by kanga.kvack.org (Postfix) with ESMTP id 447208001E for ; Thu, 22 Aug 2024 07:32:06 -0400 (EDT) Received: from smtpin17.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay10.hostedemail.com (Postfix) with ESMTP id ECDDBC02D0 for ; Thu, 22 Aug 2024 11:32:05 +0000 (UTC) X-FDA: 82479667410.17.36751E0 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by imf14.hostedemail.com (Postfix) with ESMTP id 3C057100007 for ; Thu, 22 Aug 2024 11:32:04 +0000 (UTC) Authentication-Results: imf14.hostedemail.com; dkim=none; spf=pass (imf14.hostedemail.com: domain of cmarinas@kernel.org designates 139.178.84.217 as permitted sender) smtp.mailfrom=cmarinas@kernel.org; dmarc=fail reason="SPF not aligned (relaxed), No valid DKIM" header.from=arm.com (policy=none) ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1724326243; 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=rtYChRycDT1eSliMWYyX9CTQ7efCi0hcoP8Duss7Cpo=; b=8OhUtpjyyr7euzVxhkzrDkqBtfF2yBfNBM9Td5ANZSMgkPZrLHTzG5ulCl0h9Y0uegkmd8 dkFgarfYJfyC7LJ3ephBOfntzjnlj8u7kvQbiYQEO8mf5EyAY5CfyzGC2xN+pPAn9zncwE gvBbOMJ1lptvj6ggU2eb2b06J0KMYOk= ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1724326243; a=rsa-sha256; cv=none; b=Sb2lrNWt4mTHBo/PMpzsVZ/gqt1w6GK18hE5Ns8fWsSdvQx4uGTzap8eendI58WWuuoy3G xqC/7GnlKGi/SHtpbXWEQaOAcx7JykRaBiwQXR/nJzXjjSsVE/3/Zio0iB2RJYi/0fng/3 F3MCZfyQYH0EyEQASNG/Zb5Rd7fO2sM= ARC-Authentication-Results: i=1; imf14.hostedemail.com; dkim=none; spf=pass (imf14.hostedemail.com: domain of cmarinas@kernel.org designates 139.178.84.217 as permitted sender) smtp.mailfrom=cmarinas@kernel.org; dmarc=fail reason="SPF not aligned (relaxed), No valid DKIM" header.from=arm.com (policy=none) Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by dfw.source.kernel.org (Postfix) with ESMTP id 22836610A5; Thu, 22 Aug 2024 11:32:03 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3579BC32782; Thu, 22 Aug 2024 11:31:57 +0000 (UTC) Date: Thu, 22 Aug 2024 12:31:55 +0100 From: Catalin Marinas To: Mark Brown Cc: 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 , Yury Khrustalev , Wilco Dijkstra , 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 v11 18/39] arm64/traps: Handle GCS exceptions Message-ID: References: <20240822-arm64-gcs-v11-0-41b81947ecb5@kernel.org> <20240822-arm64-gcs-v11-18-41b81947ecb5@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20240822-arm64-gcs-v11-18-41b81947ecb5@kernel.org> X-Rspam-User: X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: 3C057100007 X-Stat-Signature: pm8s76iuke1x17n9uqdrba6xurj3p1to X-HE-Tag: 1724326324-596477 X-HE-Meta: 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 XhC3z1LK 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 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 22, 2024 at 02:15:21AM +0100, Mark Brown wrote: > A new exception code is defined for GCS specific faults other than > standard load/store faults, for example GCS token validation failures, > add handling for this. These faults are reported to userspace as > segfaults with code SEGV_CPERR (protection error), mirroring the > reporting for x86 shadow stack errors. > > GCS faults due to memory load/store operations generate data aborts with > a flag set, these will be handled separately as part of the data abort > handling. > > Since we do not currently enable GCS for EL1 we should not get any faults > there but while we're at it we wire things up there, treating any GCS > fault as fatal. > > Reviewed-by: Thiago Jung Bauermann > Signed-off-by: Mark Brown Reviewed-by: Catalin Marinas