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 AE103C3DA4A for ; Mon, 19 Aug 2024 09:12:56 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 504DE6B0095; Mon, 19 Aug 2024 05:12:56 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 4B4D16B0096; Mon, 19 Aug 2024 05:12:56 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 3CAF16B0098; Mon, 19 Aug 2024 05:12:56 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0016.hostedemail.com [216.40.44.16]) by kanga.kvack.org (Postfix) with ESMTP id 206106B0095 for ; Mon, 19 Aug 2024 05:12:56 -0400 (EDT) Received: from smtpin22.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay05.hostedemail.com (Postfix) with ESMTP id BCF934108F for ; Mon, 19 Aug 2024 09:12:55 +0000 (UTC) X-FDA: 82468430310.22.E3905C6 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by imf17.hostedemail.com (Postfix) with ESMTP id 2F13740015 for ; Mon, 19 Aug 2024 09:12:53 +0000 (UTC) Authentication-Results: imf17.hostedemail.com; dkim=none; spf=pass (imf17.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=1724058671; 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=uBXUiNZYSzaFUzg77U3CDNf+sDDQP67qJKYRKD81af0=; b=VKEFk3EHcTM8pm0pkHirEFiKLBuyZ9dDgzFt2KluWzr6gcI2I1lWzQYRawruGmEgYpaYak doAk58lDy0/j55oii4Tdzer90fRxHuRM/Nuyz1bdgk1Chu9UxPXx8EQfSq4EiAZIAGIlRk /fi9+2JetnRYYQAWh1l7dIYUMrpXNAA= ARC-Authentication-Results: i=1; imf17.hostedemail.com; dkim=none; spf=pass (imf17.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-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1724058671; a=rsa-sha256; cv=none; b=vaVW/bBdkTR8Vj/wHzK6XFWuw3K8rxs4QC+skNQFPFz3D5AifSTyl4nKi1xezuqHDFT3uQ YSKWPgKtRVGdUfIa5zpSAxFWpr4rAm92ma4kZ3MH/A3l+GDBOSnnOaZNJl+tsGcpyVZwxp B93vgK4uBphd3U6lVK4fSxSYcoiy0kU= Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by dfw.source.kernel.org (Postfix) with ESMTP id 3853E601CD; Mon, 19 Aug 2024 09:12:53 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6FB2BC4AF09; Mon, 19 Aug 2024 09:12:47 +0000 (UTC) Date: Mon, 19 Aug 2024 10:12:45 +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 , 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 17/40] arm64/traps: Handle GCS exceptions Message-ID: References: <20240801-arm64-gcs-v10-0-699e2bd2190b@kernel.org> <20240801-arm64-gcs-v10-17-699e2bd2190b@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20240801-arm64-gcs-v10-17-699e2bd2190b@kernel.org> X-TUID: yZN9oqNLB5Zt X-Rspamd-Server: rspam06 X-Rspamd-Queue-Id: 2F13740015 X-Stat-Signature: o8wbb3wsjeaknna7ewzxduq7xdjhdwyq X-Rspam-User: X-HE-Tag: 1724058773-47774 X-HE-Meta: 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 hnAEw6ii 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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 01, 2024 at 01:06:44PM +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