From nobody Thu Nov 28 12:49:29 2024 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 16CAF2207A; Tue, 1 Oct 2024 23:02:28 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1727823749; cv=none; b=ko1LUt19oCi4OHBENEKMD5My0fIbEgsrgcrJzcVlhf1b0PLhXPcZYq9vf332eem/3L2hQoZ5vUJsMsYyL0drWThkGIU9jfNkkEzV4rAnDs6qw61Mr0tjDjqReJm1LJ+XZCqFD49AJe7EjQYXP5/jSWwavZ9qRJDf+I8kuAh3U+A= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1727823749; c=relaxed/simple; bh=DSXKD8gW4ItG/UhRbAzYa8PqcmIvUc0qAR0WYsCLZoQ=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=m9IGqI3DqlqkN7fjNsaYXg1eY0NgsinaWspMsV9Y4I5NpRHW8V2UHVKarv18n9THpeA1EsQpLDcCTX9NrQUkSSfJu8tTU+lWs8nJhms5svnEJWBtwPoxijTtrqtbWgWbJybsmv3kFkf8iZqkJ4/VDE5MQhOOu1gd0No1j/Iqtzs= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=Qxl1dc4f; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="Qxl1dc4f" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3C518C4CED8; Tue, 1 Oct 2024 23:02:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1727823748; bh=DSXKD8gW4ItG/UhRbAzYa8PqcmIvUc0qAR0WYsCLZoQ=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=Qxl1dc4f4chve9ceCv7x7HrnMjbe3+bj0kBlmSGkywXHx/YFH1F4fWYSGOTzq2Jj1 7YPuEbpy1zVUPFmIpGZVuVMCQDSIrz1lvAGH9OG9LpP+52gsCmSSb6WZZ+VDR13xib meOJhANTA6AH6Jib9RiKmujGbrD+wB2KbCrqYM95jtiXFIqIZ7ajdoJMOBhvDeWmi8 6QvuJHcC8UWZ0WuDlbzm3tIcDOqtW9xPLfx0u6xUNewhfaaQxsY2wOhvkFUBm3M09u jxOnI/RjxxiuXetU23l6bX0Oznw9TEWB+Vi5pT5Gs1Fuf1TmkmHTrJK+n/7Xg6wA01 SFND3170B8plQ== From: Mark Brown Date: Tue, 01 Oct 2024 23:58:53 +0100 Subject: [PATCH v13 14/40] mm: Define VM_SHADOW_STACK for arm64 when we support GCS Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20241001-arm64-gcs-v13-14-222b78d87eee@kernel.org> References: <20241001-arm64-gcs-v13-0-222b78d87eee@kernel.org> In-Reply-To: <20241001-arm64-gcs-v13-0-222b78d87eee@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 , David Spickett , 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, Mark Brown X-Mailer: b4 0.15-dev-99b12 X-Developer-Signature: v=1; a=openpgp-sha256; l=1576; i=broonie@kernel.org; h=from:subject:message-id; bh=DSXKD8gW4ItG/UhRbAzYa8PqcmIvUc0qAR0WYsCLZoQ=; b=owEBbQGS/pANAwAKASTWi3JdVIfQAcsmYgBm/H7PxDti5AFEq17Xq2PV0KS2RA+1FHmja+AU6Q78 PJq1JeSJATMEAAEKAB0WIQSt5miqZ1cYtZ/in+ok1otyXVSH0AUCZvx+zwAKCRAk1otyXVSH0Lg5B/ 0dbOlRzFreX+wW/DcvXTnsPqnbTvc6TKCMr3ypMT24HSTNXmTk1oXZvj6SkxqEIPW7OLRjM6JqCX2d Gxv0JxWUhgRiQNJtNR/8GozrVMllWWEiUMqPEdfQHU5QQojC4rvm9bEOwnUEFmaNkz4KJ3mYntbgoR SENEnmTh4wgFW1GXN6zmAkZYEiQE0qKXj6csZpSQxvgcyk5TMKyWJOSZaEBZpUP8DXYb5ITQk93O02 ChdK2ZeGYiCCMA/bHxEC47tZJ9gU9cEP/+1Ia7sC2btjq5wuYcvMaGTexhSA+HW+Du+5Eat7SUuVNi rzCuOvArXgCjMKyOF/1L92CtCNX6J2 X-Developer-Key: i=broonie@kernel.org; a=openpgp; fpr=3F2568AAC26998F9E813A1C5C3F436CA30F5D8EB Use VM_HIGH_ARCH_5 for guarded control stack pages. Reviewed-by: Thiago Jung Bauermann Reviewed-by: Catalin Marinas Signed-off-by: Mark Brown --- Documentation/filesystems/proc.rst | 2 +- include/linux/mm.h | 12 +++++++++++- 2 files changed, 12 insertions(+), 2 deletions(-) diff --git a/Documentation/filesystems/proc.rst b/Documentation/filesystems= /proc.rst index e834779d9611..6a882c57a7e7 100644 --- a/Documentation/filesystems/proc.rst +++ b/Documentation/filesystems/proc.rst @@ -579,7 +579,7 @@ encoded manner. The codes are the following: mt arm64 MTE allocation tags are enabled um userfaultfd missing tracking uw userfaultfd wr-protect tracking - ss shadow stack page + ss shadow/guarded control stack page sl sealed =3D=3D =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D =20 diff --git a/include/linux/mm.h b/include/linux/mm.h index 56654306a832..8852c39c7695 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -367,7 +367,17 @@ extern unsigned int kobjsize(const void *objp); * for more details on the guard size. */ # define VM_SHADOW_STACK VM_HIGH_ARCH_5 -#else +#endif + +#if defined(CONFIG_ARM64_GCS) +/* + * arm64's Guarded Control Stack implements similar functionality and + * has similar constraints to shadow stacks. + */ +# define VM_SHADOW_STACK VM_HIGH_ARCH_6 +#endif + +#ifndef VM_SHADOW_STACK # define VM_SHADOW_STACK VM_NONE #endif =20 --=20 2.39.2