From patchwork Thu Aug 22 01:15:16 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mark Brown X-Patchwork-Id: 13772497 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 97158C531DC for ; Thu, 22 Aug 2024 02:31:06 +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=rduCnP/qJ6ZTgC132xa6OYShmwb48ROC/5R9Zzk0HAE=; b=1YjI1OXwt0zer4TGXCIfrctDre nnhacxS6oN7eSsRfFRhBGwDz79hTjlYVEcZhmhNsJ4d1O55CNlLUNqoxrKXi59IDAOzi+WnFfNZV1 5L080iMABVQxGn3W06J8Z7VKzJ4XTDws8suT4u1jV/tRBQ3mAKH45lt908aSEgZmyl1xKqeSbWOM3 MpNM+gs7Vf2kBfaMKHjEW0xzSiRo8dI1EaU8zMdOBwqMnDuDCd7AR2rXxByIguvCadGlzocr8zA5J aSUE/J4LG8BRlo2GZ3wyNRLXFK+votz/MhCg5u78AoXKbwkcxeL8sRaNjWIXB21V2udqHNch7viMz DJPzZ/8A==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1sgxb9-0000000B4GE-3iFz; Thu, 22 Aug 2024 02:30:51 +0000 Received: from nyc.source.kernel.org ([2604:1380:45d1:ec00::3]) by bombadil.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1sgwTN-0000000Arvx-3a6o; Thu, 22 Aug 2024 01:18:47 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by nyc.source.kernel.org (Postfix) with ESMTP id 6071EA420FB; Thu, 22 Aug 2024 01:18:38 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 38943C4AF1B; Thu, 22 Aug 2024 01:18:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1724289524; bh=yrclwp0293yC9GB/YqBAfQERM0nqbhUl6FyE+eoviK4=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=iIhkv1vXoKilgfdT7HIpB4HOZs+tLh/vFixxXmDjlkcZOklxf/MPAb1ew2Z8s+pEO K9riiigrezQbjBZf8OrNt0pyEivoy7GtrdMSX6y0Us6jX8mcNcwIK9j5WlwlWY9lzv 9S6HtvWiw521yHF7WXQqdK3ML6TOBXmemGFmJz5w0fw2XxoBIa1ATqkCrGr2BOtarC /7OLDWVT2kesr8q9MRXPrTLBgRBmVqM0sEgSvmnaDJX8zD5MuSNC/SJ8rH0m7HfBsN GkDTr0PYd/Ak4qlnOiyZ0YVy9OaKQ4GOS0r6+3mFU1Se+kyYOQLFzkJe89yh+6kg7Z pRi2X/R6uve+w== From: Mark Brown Date: Thu, 22 Aug 2024 02:15:16 +0100 Subject: [PATCH v11 13/39] mm: Define VM_SHADOW_STACK for arm64 when we support GCS MIME-Version: 1.0 Message-Id: <20240822-arm64-gcs-v11-13-41b81947ecb5@kernel.org> References: <20240822-arm64-gcs-v11-0-41b81947ecb5@kernel.org> In-Reply-To: <20240822-arm64-gcs-v11-0-41b81947ecb5@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 , 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-37811 X-Developer-Signature: v=1; a=openpgp-sha256; l=1520; i=broonie@kernel.org; h=from:subject:message-id; bh=yrclwp0293yC9GB/YqBAfQERM0nqbhUl6FyE+eoviK4=; b=owEBbQGS/pANAwAKASTWi3JdVIfQAcsmYgBmxpEtEhQ9d687I7aOExxok/8WQuFAhrCVZiopb6w+ BmeozzOJATMEAAEKAB0WIQSt5miqZ1cYtZ/in+ok1otyXVSH0AUCZsaRLQAKCRAk1otyXVSH0E5XB/ 9eKoZTlYi2BVbXjZrWbLqWquzXlD2d+PNTXFZrH5hsQjONsDoi9Pjc6vBP2Rq+zvYcDgloXucC4+kG to2qv8LkOUjq+GOgrh0Z5mqVIKef7bjvQXqo06la6oQGX6nNVJGdWI/IstMcgIyCMntSbj7B7hd2GL nDPorXdYdtt5GeQ6TGgSk5QjUZV8zvx36gLNa8TYUF9F8FTiHnnoyQYVmf7AfQHui5ooHkDM4EaNxO hkuiI4xMnP6MP3nZ1YsCWflEesxR3FoEI0PgPPyTfHrYqlNbXh72h5IMT0a9Ntqj0StxJx4wOiGdJ/ vKhAPFViGCFXtK5c9StuFJx2HxH+I7 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-20240821_181846_053981_7AB9A1DC X-CRM114-Status: GOOD ( 10.14 ) 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 Use VM_HIGH_ARCH_5 for guarded control stack pages. Reviewed-by: Thiago Jung Bauermann Signed-off-by: Mark Brown Reviewed-by: Catalin Marinas --- 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 == ======================================= diff --git a/include/linux/mm.h b/include/linux/mm.h index 96faf26b6083..c6c7454ce4e0 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -353,7 +353,17 @@ 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_5 +#endif + +#ifndef VM_SHADOW_STACK # define VM_SHADOW_STACK VM_NONE #endif