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Peter Anvin" , Thomas Gleixner , Ingo Molnar , linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, linux-mm@kvack.org, linux-arch@vger.kernel.org, linux-api@vger.kernel.org, Arnd Bergmann , Andy Lutomirski , Balbir Singh , Borislav Petkov , Cyrill Gorcunov , Dave Hansen , Eugene Syromiatnikov , Florian Weimer , "H.J. Lu" , Jann Horn , Jonathan Corbet , Kees Cook , Mike Kravetz , Nadav Amit , Oleg Nesterov , Pavel Machek , Peter Zijlstra , Randy Dunlap , "Ravi V. Shankar" , Vedvyas Shanbhogue , Dave Martin , Weijiang Yang , Pengfei Xu Cc: Yu-cheng Yu Subject: [PATCH v13 1/8] x86/cet/ibt: Add Kconfig option for user-mode Indirect Branch Tracking Date: Fri, 25 Sep 2020 07:57:57 -0700 Message-Id: <20200925145804.5821-2-yu-cheng.yu@intel.com> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20200925145804.5821-1-yu-cheng.yu@intel.com> References: <20200925145804.5821-1-yu-cheng.yu@intel.com> MIME-Version: 1.0 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Introduce Kconfig option X86_BRANCH_TRACKING_USER. Indirect Branch Tracking (IBT) provides protection against CALL-/JMP- oriented programming attacks. It is active when the kernel has this feature enabled, and the processor and the application support it. When this feature is enabled, legacy non-IBT applications continue to work, but without IBT protection. Signed-off-by: Yu-cheng Yu --- v13: - Update help text, and change default to N. - Change X86_INTEL_* to X86_*. v10: - Change build-time CET check to config depends on. arch/x86/Kconfig | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 4b28a0ce4594..15c7f2606c9d 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -1966,6 +1966,25 @@ config X86_SHADOW_STACK_USER If unsure, say N. +config X86_BRANCH_TRACKING_USER + prompt "Intel Indirect Branch Tracking for user-mode" + def_bool n + depends on CPU_SUP_INTEL && X86_64 + depends on $(cc-option,-fcf-protection) + select X86_CET + help + Indirect Branch Tracking (IBT) provides protection against + CALL-/JMP-oriented programming attacks. It is active when + the kernel has this feature enabled, and the processor and + the application support it. When this feature is enabled, + legacy non-IBT applications continue to work, but without + IBT protection. + Support for this feature is only known to be present on + processors released in 2020 or later. CET features are also + known to increase kernel text size by 3.7 KB. + + If unsure, say N. + config EFI bool "EFI runtime service support" depends on ACPI