From patchwork Wed Nov 22 09:42:22 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mark Brown X-Patchwork-Id: 13464342 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 5955516407; Wed, 22 Nov 2023 09:44:23 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="DhF0C8ob" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 041B7C43397; Wed, 22 Nov 2023 09:44:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1700646262; bh=Df+HY0dV5R5n1ih4MqR1JvyrE5qdgwZR/dZq7PG88vE=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=DhF0C8obSjt9Nfr4iuhMF+MfrBzvOMHkq9LmVgyYKZnO9fIVLqs7HPAS+n3JPEKJ0 dLQEv4IqHz985M/9vF5RA3TEblITjIIzbNMwRKx3W4AeIrzRpwLIpvKWycDupEWd4k HDnsgVbJ2E80hUb0HTiGD+TfDklzJH8Ma+jZ6ZDSObz510LSGSdIjpW/3G98VBnzUv DxrYCGKBYiovBFq7e5dPgwWVI3DxTMzU2LE/Db2CvFUUPnnfx59dYtoZlztgKFgZdC Xnv3q15QP1P/yyGxaz73jzcQ0IOLjraOoSEdX2zUMo2fgiDmta5EVVRM0eoUCmP1lx wbCpNkVqokZ9Q== From: Mark Brown Date: Wed, 22 Nov 2023 09:42:22 +0000 Subject: [PATCH v7 12/39] mm: Define VM_SHADOW_STACK for arm64 when we support GCS Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20231122-arm64-gcs-v7-12-201c483bd775@kernel.org> References: <20231122-arm64-gcs-v7-0-201c483bd775@kernel.org> In-Reply-To: <20231122-arm64-gcs-v7-0-201c483bd775@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 , Kees Cook , Shuah Khan , "Rick P. Edgecombe" , Deepak Gupta , Ard Biesheuvel , Szabolcs Nagy Cc: "H.J. Lu" , Paul Walmsley , Palmer Dabbelt , Albert Ou , Florian Weimer , Christian Brauner , Thiago Jung Bauermann , 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 0.13-dev-0438c X-Developer-Signature: v=1; a=openpgp-sha256; l=2038; i=broonie@kernel.org; h=from:subject:message-id; bh=Df+HY0dV5R5n1ih4MqR1JvyrE5qdgwZR/dZq7PG88vE=; b=owEBbQGS/pANAwAKASTWi3JdVIfQAcsmYgBlXcz/qzN33RRp1sMMsdDeIWGemytfZkpPWLo4a cwQK9wJLbWJATMEAAEKAB0WIQSt5miqZ1cYtZ/in+ok1otyXVSH0AUCZV3M/wAKCRAk1otyXVSH 0CJlB/42DNRC926QZda7ZgVHwYfL0gTMCpMI6gcouqu0xgA1HTtwNrwD613VnSOoyxtfTGVzCMY tsVAy8UOqNqRN6Dz4Zh0A+WmkLl1I5GdvGmF54We0wD2eSV5cLIVOIbdhyzcHObAzfkNwcd8LZV xX6x0wVfcf5dhIKnwCSx7NL3qmoP/2RuVklEW90UpGYkcYj/L3FIb/kydQwjinq8/NYa8ybu2FI iPgL35MV+Ppu4QMvQxgI4+09gl+0XIjyeFDoigRWiF/oIFAz8r4t9jdHMwTU+YpNFLdNthAWQ/S faocMmU8q7Y6bz+9r3UGqczI7+EUjPo4aNc0Gwlh0vqeaAX/ X-Developer-Key: i=broonie@kernel.org; a=openpgp; fpr=3F2568AAC26998F9E813A1C5C3F436CA30F5D8EB Use VM_HIGH_ARCH_5 for guarded control stack pages. Signed-off-by: Mark Brown --- Documentation/filesystems/proc.rst | 2 +- fs/proc/task_mmu.c | 3 +++ include/linux/mm.h | 12 +++++++++++- 3 files changed, 15 insertions(+), 2 deletions(-) diff --git a/Documentation/filesystems/proc.rst b/Documentation/filesystems/proc.rst index 49ef12df631b..1dfc5cb20f28 100644 --- a/Documentation/filesystems/proc.rst +++ b/Documentation/filesystems/proc.rst @@ -570,7 +570,7 @@ 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 == ======================================= Note that there is no guarantee that every flag and associated mnemonic will diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c index f0a904aeee8e..29fd7d6fbeb0 100644 --- a/fs/proc/task_mmu.c +++ b/fs/proc/task_mmu.c @@ -701,6 +701,9 @@ static void show_smap_vma_flags(struct seq_file *m, struct vm_area_struct *vma) #endif /* CONFIG_HAVE_ARCH_USERFAULTFD_MINOR */ #ifdef CONFIG_ARCH_HAS_USER_SHADOW_STACK [ilog2(VM_SHADOW_STACK)] = "ss", +#endif +#ifdef CONFIG_ARM64_GCS + [ilog2(VM_SHADOW_STACK)] = "ss", #endif }; size_t i; diff --git a/include/linux/mm.h b/include/linux/mm.h index 8b28483b4afa..3c96fc6c1128 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -352,7 +352,17 @@ 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