From patchwork Tue Oct 1 22:59:07 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mark Brown X-Patchwork-Id: 13818941 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 7FC2B1CDFD9; Tue, 1 Oct 2024 23:05:10 +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=1727823911; cv=none; b=bf12NfmZqP9pZ1+HswggeWBJ8mUKNIRgodjkKq9AEjYB8ogU8uCNjCjqZU4XfBdVMiyQmPqUXYr835w4Bif47T1FjRNEhFHvexwxlukYa+/zXTyq8ems+pg0mzCClmtV9nVGH3cYha4+JXRDieNsO0uEmSaTcGwCqrYybMrZsgw= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1727823911; c=relaxed/simple; bh=atDZEtbemNIieqZC6RtXrtbJMuxF2tLKf2K/TSJvVes=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=ZYxvXC6vITjiBI2CWJsx0RMhqQzbn2yaOB/lYI5yPlE5BZ4NWdY/020vUo7MMlOwLUcLQCg0EejeLgGumCRkl2H8lIVAQfIKpN1T/je2xZ4AvGbRdhXhMyodUXl3gRyhmDhWBqJL7FCeLd9bOY/NmA21QwPENKNN7DL45V6GBhw= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=B5J7eMmH; 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="B5J7eMmH" Received: by smtp.kernel.org (Postfix) with ESMTPSA id C2430C4CEC6; Tue, 1 Oct 2024 23:04:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1727823910; bh=atDZEtbemNIieqZC6RtXrtbJMuxF2tLKf2K/TSJvVes=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=B5J7eMmHKHd97SZEJxiVYhbNX/Ks8kJn5Nue5+50O9KQLxkG1E+ZShZeg7g74vkcV A18Gq9rmhXe19Z4kUcF+pJs+Qtvsqr91+6+b7Kbsshk5rbEYcPSxMF6dM0k1CoOe1h e7cF+4+kslmzvSIQSqXfflUfAQAyfMhFn+CLChMvKBH4y0HQkYfZBLgHsx4waUTth1 FFWq7cK+cnEGEWp6Vnhnn8l3ARtW5Mw5+nZSWMAvmkBEWfgsMfYi/qYMdxye19J2jn B7Sl2jtRZqa10PTgSCq8QLQWkDF2ckA/wZ0Me+T/OCoSkGoPz9AVJA8AU9mCB+UO5i YC+XhEF1TuzLw== From: Mark Brown Date: Tue, 01 Oct 2024 23:59:07 +0100 Subject: [PATCH v13 28/40] arm64: Add Kconfig for Guarded Control Stack (GCS) Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20241001-arm64-gcs-v13-28-222b78d87eee@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=1477; i=broonie@kernel.org; h=from:subject:message-id; bh=atDZEtbemNIieqZC6RtXrtbJMuxF2tLKf2K/TSJvVes=; b=owEBbQGS/pANAwAKASTWi3JdVIfQAcsmYgBm/H7Zc7rKkETgD5/LTaxxdr7BGJRS0qSsZjNw/txV r2Wuw/+JATMEAAEKAB0WIQSt5miqZ1cYtZ/in+ok1otyXVSH0AUCZvx+2QAKCRAk1otyXVSH0M+qB/ 91ODENwPWdKuLlElj/7OYeWGSCjN5ITwHJ4ppzWwF1BP5tpBhvEs9TuGenH2UXxcohCfUT6yjbeNU7 BqHi1YY0+wQUtr4ulVRIVOnj1gq7q8h/tS/NBM0kzuoPNW/h3FxRY8l5bCnYAo5i4/0MKAznj5S5pL tj2aRrRznvG5Pj2t4m43nTUIxrTduG05Cdqisl6Txjh+LJSLhBOsiLtFeWGetiiTrHDcpNisfrWB/g INyNQ3jEJ06Kni4oXAI1kFQBiWcbUVqmeRHJg4jEpObnjwLN4GS3NWbsDfDtfdFgL9q0FM2zOz1vfP x+uZvUmrp6KnGE2kvCpjKmctHavSdF X-Developer-Key: i=broonie@kernel.org; a=openpgp; fpr=3F2568AAC26998F9E813A1C5C3F436CA30F5D8EB Provide a Kconfig option allowing the user to select if GCS support is built into the kernel. Reviewed-by: Thiago Jung Bauermann Reviewed-by: Catalin Marinas Signed-off-by: Mark Brown --- arch/arm64/Kconfig | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index 3e29b44d2d7b..dcb12f041c13 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -2178,6 +2178,27 @@ config ARCH_PKEY_BITS endmenu # "ARMv8.9 architectural features" +menu "v9.4 architectural features" + +config ARM64_GCS + bool "Enable support for Guarded Control Stack (GCS)" + default y + select ARCH_HAS_USER_SHADOW_STACK + select ARCH_USES_HIGH_VMA_FLAGS + depends on !UPROBES + help + Guarded Control Stack (GCS) provides support for a separate + stack with restricted access which contains only return + addresses. This can be used to harden against some attacks + by comparing return address used by the program with what is + stored in the GCS, and may also be used to efficiently obtain + the call stack for applications such as profiling. + + The feature is detected at runtime, and will remain disabled + if the system does not implement the feature. + +endmenu # "v9.4 architectural features" + config ARM64_SVE bool "ARM Scalable Vector Extension support" default y