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 DC239CD379F for ; Tue, 3 Sep 2024 16:38:31 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 5685B8D01AB; Tue, 3 Sep 2024 12:38:31 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 4A1508D018A; Tue, 3 Sep 2024 12:38:31 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 3432D8D01AB; Tue, 3 Sep 2024 12:38:31 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0014.hostedemail.com [216.40.44.14]) by kanga.kvack.org (Postfix) with ESMTP id 145678D018A for ; Tue, 3 Sep 2024 12:38:31 -0400 (EDT) Received: from smtpin14.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay08.hostedemail.com (Postfix) with ESMTP id B6BC81406DE for ; Tue, 3 Sep 2024 16:38:30 +0000 (UTC) X-FDA: 82523985180.14.2420C0C Received: from nyc.source.kernel.org (nyc.source.kernel.org [147.75.193.91]) by imf24.hostedemail.com (Postfix) with ESMTP id 1CFE2180007 for ; Tue, 3 Sep 2024 16:38:28 +0000 (UTC) Authentication-Results: imf24.hostedemail.com; dkim=none; dmarc=fail reason="SPF not aligned (relaxed), No valid DKIM" header.from=arm.com (policy=none); spf=pass (imf24.hostedemail.com: domain of cmarinas@kernel.org designates 147.75.193.91 as permitted sender) smtp.mailfrom=cmarinas@kernel.org ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1725381415; 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=+dHIfzaeLWIWA+kaGYIDBPcUI1EDfni54Q8J+imu4wY=; b=Xbo8xOugJCLKuzyAdj31e6q8yvhbUTD48AdPYyYWz+P62UKqvP4iEH4od900kwNwClcc4+ ntRtXaPHhlsurIsXxe2umlTbZN+Smj5YucA1VdSn6LEnDsP33mBxyLhOkFHoECd5z7mBYW qUHdld6Laxx+WDt/VXXpunSE4M+cKQU= ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1725381415; a=rsa-sha256; cv=none; b=aWBmQb8uhkrwsibOSxiekYeXcNzIN7wWyCEvhrB39uS4se3ZQCjmILQjYF4AvH1T3nd7l0 d4CMe5TfR2jvLIzgC2uY5GMfvcFV2VWv9ZChzsbwOQjni84lCjF8JRJQtl4FTxGmIR4Yx4 LpQ2BGiRbYDr0EqDv06WuhtfXXoXSsA= ARC-Authentication-Results: i=1; imf24.hostedemail.com; dkim=none; dmarc=fail reason="SPF not aligned (relaxed), No valid DKIM" header.from=arm.com (policy=none); spf=pass (imf24.hostedemail.com: domain of cmarinas@kernel.org designates 147.75.193.91 as permitted sender) smtp.mailfrom=cmarinas@kernel.org Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by nyc.source.kernel.org (Postfix) with ESMTP id 3094DA4374F; Tue, 3 Sep 2024 16:38:21 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 697ECC4CEC4; Tue, 3 Sep 2024 16:38:22 +0000 (UTC) Date: Tue, 3 Sep 2024 17:38:20 +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 v12 26/39] arm64/ptrace: Expose GCS via ptrace and core files Message-ID: References: <20240829-arm64-gcs-v12-0-42fec947436a@kernel.org> <20240829-arm64-gcs-v12-26-42fec947436a@kernel.org> <3f190f54-477e-48dd-8a57-8d61ea20413b@sirena.org.uk> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <3f190f54-477e-48dd-8a57-8d61ea20413b@sirena.org.uk> X-Rspamd-Queue-Id: 1CFE2180007 X-Stat-Signature: zf8kh3urfjhhp4ap8emd17rrpku9dfoi X-Rspamd-Server: rspam09 X-Rspam-User: X-HE-Tag: 1725381508-789353 X-HE-Meta: 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 dOuXH3b5 4BgOd05gINP4bGdKFYLvJXRL48WtmgFwkLLHTJYQKWoA9A8qmt0jxoaufMvwywqA2sKTDMW7XU1BQIMSNbdyioyps1Zi/BUj2gIg99YM5wlCqeerA2adxWy5ixGbqDDqS+LACd6t8riLY2xciElu/mcNC7yg+qmDMzfovduBa20hO/WxRxhb6uu4Pbw8x0M76MVW4c+GfB8Qr5ayvV8uX+PTO8nDIqKZnfe90p9RFKsuj8hcGAgI2sE6px8y3Ro/4k7PsBe1/QmT7M4WAawl4fplDyIcQHEbMOw0yZ9jWy6DeWHARQ2Ec1pX2RAWVVSx2e2Lw7zrJIVAe/UlqjXuPDC3tCBfftsGgqvw0GXRiYTj0RqjW21PVwsdy4uuyxh8EVfiv5CnhMp2hVJ4NuEuF5Pm8E+Wdpm00YdJK 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 Mon, Sep 02, 2024 at 07:58:28PM +0100, Mark Brown wrote: > On Mon, Sep 02, 2024 at 07:56:32PM +0100, Catalin Marinas wrote: > > On Thu, Aug 29, 2024 at 12:27:42AM +0100, Mark Brown wrote: > > > > +static int gcs_get(struct task_struct *target, > > > + const struct user_regset *regset, > > > + struct membuf to) > > > > + if (target == current) > > > + gcs_preserve_current_state(); > > > What's the use-case where target == current and do we need something > > similar for gcs_set()? > > IIRC core file generation so no. Ah, true. Makes sense. -- Catalin