From patchwork Tue Jun 25 14:57:31 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mark Brown X-Patchwork-Id: 13711342 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 0EF73C30659 for ; Tue, 25 Jun 2024 15:01:36 +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:Cc:To:In-Reply-To:References :Message-Id:Content-Transfer-Encoding:Content-Type:MIME-Version:Subject:Date: From:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=70cjjLOtabb/rzl2w02OHZeRiB/3csN9WFGlBeL2SM8=; b=RIk0zodvMNHUhWQXF7/LZlDLeY e6nvu2Z7C6l5sHWFPM7bOS0FuTb6O+zFwQYB7y1eeDjzY4UuNdgRf0Q9bFCscXnzwInQpn4Ax1CeC GaKUz7QtXmfY0kD834uNxwn4cWTC93BCfC/U0LprZVThlE1T2cYu/cx3DwePpsXHVI9nM+2/b0kBy 6PnwtLHVRQorBcfdUl7YCYm+cO8qFWpgqKyrEnq+ATLgzoYSEVY7I9q44L0RKKhFb9JXn4DiXEoTm Y4SqqwbH7quGHR/WIbV3MlttjhNwQTHun1+eIw3NQD6tyUEQ/Jj0oD3LUS7zl8n109lskPmlQ9V6+ d0pUKEOQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1sM7fd-00000003JYk-1FSW; Tue, 25 Jun 2024 15:01:21 +0000 Received: from sin.source.kernel.org ([2604:1380:40e1:4800::1]) by bombadil.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1sM7fM-00000003JLN-2EVV; Tue, 25 Jun 2024 15:01:06 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by sin.source.kernel.org (Postfix) with ESMTP id 4AF51CE1ACB; Tue, 25 Jun 2024 15:01:02 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 1F182C32786; Tue, 25 Jun 2024 15:00:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1719327661; bh=2jWl08+8re+Jbyu9WlYwMAOos2oJrw5SQjRGnUXuA4U=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=mzTxWTliTuTTk2JUY2LHGWlCpOYNhYQnbqbOaFCe1eKW3ChL80lwGsA7v15pLtIRr /CY5sah9wnG+/M/txc13UoiuTO17cga0aTsKBhWydbMUTpqWTnXbQDAs1a0SfXHdLl qoVcTGQynXNZq/6dMkLB1GEjLpGe+SlvF97AnPT4nal9BAJupDUdL6g1YvtgvjwhMw U7N5JBpsOck0pb6hjzSqcgOGUvjanbOjMt0n1yZOv7628rSels/zwtth3YaW1p5bfT c78+EMP6WFoUlDyn7SE6zLhy3h7EzsZ6bHr8FIMO+0yD80LEqzwuQEWN6u9EWokxPR RHWBkVwDixtzw== From: Mark Brown Date: Tue, 25 Jun 2024 15:57:31 +0100 Subject: [PATCH v9 03/39] mman: Add map_shadow_stack() flags MIME-Version: 1.0 Message-Id: <20240625-arm64-gcs-v9-3-0f634469b8f0@kernel.org> References: <20240625-arm64-gcs-v9-0-0f634469b8f0@kernel.org> In-Reply-To: <20240625-arm64-gcs-v9-0-0f634469b8f0@kernel.org> To: 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 Cc: "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, Mark Brown X-Mailer: b4 0.14-dev-d4707 X-Developer-Signature: v=1; a=openpgp-sha256; l=1825; i=broonie@kernel.org; h=from:subject:message-id; bh=2jWl08+8re+Jbyu9WlYwMAOos2oJrw5SQjRGnUXuA4U=; b=owEBbQGS/pANAwAKASTWi3JdVIfQAcsmYgBmett0AYMvTd4M+mUQzuB+sU2VGcUcJh2k6ep8k/Oa xyt8GD+JATMEAAEKAB0WIQSt5miqZ1cYtZ/in+ok1otyXVSH0AUCZnrbdAAKCRAk1otyXVSH0Le7B/ 4p0K3blNBx+osPkkQaCF9XLApSwBKl8n26fdMeAmlfh9bwsWryKXKzkHHLO75WHM/ERBc/0i0yBbEz zKduRjPO+mSToFcQa1HgNifE5HXJ2OsSGNnQq71vZtOnDHVzxP+UwGe431j5UV5/6dHUMIj9lfY0g+ 6MJKhHwJ43INBah+hkUj4yNnSmM/eK4Ujfo3CuMqn6aBRXjQlxqsRH1KoLQR0q0d1YBUN6/pV2jCCx BTzIJ/gM/FsVYtegicohXfVWCnHv41lXYJL7HVDBny0rtyvj+u6H7erniqjPqueHr2ZBKmWeO293xS kwYER8Ltdo/507ycRN89NL9U18KQ/V X-Developer-Key: i=broonie@kernel.org; a=openpgp; fpr=3F2568AAC26998F9E813A1C5C3F436CA30F5D8EB X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240625_080105_101538_A0BEC91E X-CRM114-Status: GOOD ( 13.28 ) 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 In preparation for adding arm64 GCS support make the map_shadow_stack() SHADOW_STACK_SET_TOKEN flag generic and add _SET_MARKER. The existing flag indicats that a token usable for stack switch should be added to the top of the newly mapped GCS region while the new flag indicates that a top of stack marker suitable for use by unwinders should be added above that. For arm64 the top of stack marker is all bits 0. Reviewed-by: Thiago Jung Bauermann Signed-off-by: Mark Brown --- arch/x86/include/uapi/asm/mman.h | 3 --- include/uapi/asm-generic/mman.h | 4 ++++ 2 files changed, 4 insertions(+), 3 deletions(-) diff --git a/arch/x86/include/uapi/asm/mman.h b/arch/x86/include/uapi/asm/mman.h index 46cdc941f958..ac1e6277212b 100644 --- a/arch/x86/include/uapi/asm/mman.h +++ b/arch/x86/include/uapi/asm/mman.h @@ -5,9 +5,6 @@ #define MAP_32BIT 0x40 /* only give out 32bit addresses */ #define MAP_ABOVE4G 0x80 /* only map above 4GB */ -/* Flags for map_shadow_stack(2) */ -#define SHADOW_STACK_SET_TOKEN (1ULL << 0) /* Set up a restore token in the shadow stack */ - #include #endif /* _ASM_X86_MMAN_H */ diff --git a/include/uapi/asm-generic/mman.h b/include/uapi/asm-generic/mman.h index 57e8195d0b53..d6a282687af5 100644 --- a/include/uapi/asm-generic/mman.h +++ b/include/uapi/asm-generic/mman.h @@ -19,4 +19,8 @@ #define MCL_FUTURE 2 /* lock all future mappings */ #define MCL_ONFAULT 4 /* lock all pages that are faulted in */ +#define SHADOW_STACK_SET_TOKEN (1ULL << 0) /* Set up a restore token in the shadow stack */ +#define SHADOW_STACK_SET_MARKER (1ULL << 1) /* Set up a top of stack merker in the shadow stack */ + + #endif /* __ASM_GENERIC_MMAN_H */