| Message ID | 20240203-arm64-gcs-v8-26-c9fec77673ef@kernel.org (mailing list archive) |
|---|---|
| State | New |
| Headers | show
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 5680C7762E; Sat, 3 Feb 2024 12:32:36 +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=1706963557; cv=none; b=AcSoHrn0wlCXoR9yjsSQGLfO1T9qMwkwiXzg+TPYNlq6IfJt+m1IGm4oXCSWUiqjUhbntdM80Vo9hfs1PvURbtWdNlFyCUYFdA9SZ0j/6wUXp4f4a6DDJaQ9xVKzIdGrTozCQN8Khsv8rptfeMxG5YKSVhsEsmx30x3qhSKVdeE= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706963557; c=relaxed/simple; bh=RGzSIrmEW7Jf6evuT6565KZp1tpVwBC25PeiKV/XCIM=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=AclgKjta+zioEIyu8IYfUJ6Wn3CSDh6NJGRZ6LqG7FFfqIOL4Sjlp1GkfEYrphudNBXzXy4r/U6JaLZBuz2yJXsfVnnq7V/ESX5PLJTCaK0ndso9JO4PLwv+xynMM8uFJeuz4obEXd4j1y+HERLr4qbzAOpybJ0dOR7KLKnbY+o= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=Rr0NlCUf; 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="Rr0NlCUf" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 76DADC433F1; Sat, 3 Feb 2024 12:32:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1706963556; bh=RGzSIrmEW7Jf6evuT6565KZp1tpVwBC25PeiKV/XCIM=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=Rr0NlCUfUX2j3myBULSLJPalVM826rFJl0vTY3fYPNIAoGjsaWyYKxtBifaNm6sDv R3k3Z+e3/jgWq5+5PInC1Osi52ku2mCr6D9o1aURAOeLt+R2Zkk5U6R2wCML7xz6zk PG81g8AMxl2rVOrJUNnz2N35u5ho9Xg89aJIJj9OoWN9wFUIZ/qvSjm3ZM8I4h9hFC AbMSyA++bvK+sdEPPG3qzzEnAj62MLnGKSS32CcHHeeK/jUMKkKjE6RdyAZ+tvsviN dDdf/wFFm15nQghsG5q3BA7MRI+OHsHHN8xmcmlC7HDsvlRem/d2ChYl+uIz2gqkTZ rhMiIq5b7EusQ== From: Mark Brown <broonie@kernel.org> Date: Sat, 03 Feb 2024 12:25:52 +0000 Subject: [PATCH v8 26/38] arm64: Add Kconfig for Guarded Control Stack (GCS) Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: <linux-kselftest.vger.kernel.org> List-Subscribe: <mailto:linux-kselftest+subscribe@vger.kernel.org> List-Unsubscribe: <mailto:linux-kselftest+unsubscribe@vger.kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20240203-arm64-gcs-v8-26-c9fec77673ef@kernel.org> References: <20240203-arm64-gcs-v8-0-c9fec77673ef@kernel.org> In-Reply-To: <20240203-arm64-gcs-v8-0-c9fec77673ef@kernel.org> To: Catalin Marinas <catalin.marinas@arm.com>, Will Deacon <will@kernel.org>, Jonathan Corbet <corbet@lwn.net>, Andrew Morton <akpm@linux-foundation.org>, Marc Zyngier <maz@kernel.org>, Oliver Upton <oliver.upton@linux.dev>, James Morse <james.morse@arm.com>, Suzuki K Poulose <suzuki.poulose@arm.com>, Arnd Bergmann <arnd@arndb.de>, Oleg Nesterov <oleg@redhat.com>, Eric Biederman <ebiederm@xmission.com>, Kees Cook <keescook@chromium.org>, Shuah Khan <shuah@kernel.org>, "Rick P. Edgecombe" <rick.p.edgecombe@intel.com>, Deepak Gupta <debug@rivosinc.com>, Ard Biesheuvel <ardb@kernel.org>, Szabolcs Nagy <Szabolcs.Nagy@arm.com> Cc: "H.J. Lu" <hjl.tools@gmail.com>, Paul Walmsley <paul.walmsley@sifive.com>, Palmer Dabbelt <palmer@dabbelt.com>, Albert Ou <aou@eecs.berkeley.edu>, Florian Weimer <fweimer@redhat.com>, Christian Brauner <brauner@kernel.org>, Thiago Jung Bauermann <thiago.bauermann@linaro.org>, 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 <broonie@kernel.org> X-Mailer: b4 0.13-dev-a684c X-Developer-Signature: v=1; a=openpgp-sha256; l=1372; i=broonie@kernel.org; h=from:subject:message-id; bh=RGzSIrmEW7Jf6evuT6565KZp1tpVwBC25PeiKV/XCIM=; b=owEBbQGS/pANAwAKASTWi3JdVIfQAcsmYgBlvjDlwn8OBL1okRa937HDPu7LnBF8+tPg3W5TVRmQ TyRiYLiJATMEAAEKAB0WIQSt5miqZ1cYtZ/in+ok1otyXVSH0AUCZb4w5QAKCRAk1otyXVSH0GddB/ 94PnXcnxhx9d3Igx3+8wyrY4sdF5KYIjmDuj3squkXqrrZ2tiirA6Q62mQp8vp+ezqY1jRXa4sYuJ6 S4br3364VBFwZURGrMoqdURAvnmTRIVSNGGYe6TRIoFURRVmXmsSb1Zx9GeUJE+887P2YThSn1hX4u UYhHuNxxIuI+/hGpYdkS35l+885fx4nMPUte+GNr+FvdEa6vqVjtRScIfSuKLmDgZ/N4wSajZL/k1q rBPuJY2ifU59ibgG/D9dxZieNsgex3LyQf29V2Ibhl6yWuOIeyY9K15eIuhbvVWh0jnwxw8K8dMwt4 yP307QaPCE4iW0R2nFKNxCYMzLGxW/ X-Developer-Key: i=broonie@kernel.org; a=openpgp; fpr=3F2568AAC26998F9E813A1C5C3F436CA30F5D8EB |
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arm64/gcs: Provide support for GCS in userspace
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expand
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diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index aa7c1d435139..e0048e4660cf 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -2098,6 +2098,26 @@ config ARM64_EPAN if the cpu does not implement the feature. endmenu # "ARMv8.7 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 + 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
Provide a Kconfig option allowing the user to select if GCS support is built into the kernel. Signed-off-by: Mark Brown <broonie@kernel.org> --- arch/arm64/Kconfig | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+)