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[198.145.64.163]) by smtp.gmail.com with ESMTPSA id k15sm516116pfi.0.2021.04.28.13.29.21 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 28 Apr 2021 13:29:21 -0700 (PDT) Date: Wed, 28 Apr 2021 13:29:20 -0700 From: Kees Cook To: Yu-cheng Yu Cc: x86@kernel.org, "H. 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 , Mike Kravetz , Nadav Amit , Oleg Nesterov , Pavel Machek , Peter Zijlstra , Randy Dunlap , "Ravi V. Shankar" , Vedvyas Shanbhogue , Dave Martin , Weijiang Yang , Pengfei Xu , Haitao Huang Subject: Re: [PATCH v26 1/9] x86/cet/ibt: Add Kconfig option for Indirect Branch Tracking Message-ID: <202104281329.564AACB@keescook> References: <20210427204720.25007-1-yu-cheng.yu@intel.com> <20210427204720.25007-2-yu-cheng.yu@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20210427204720.25007-2-yu-cheng.yu@intel.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Apr 27, 2021 at 01:47:12PM -0700, Yu-cheng Yu wrote: > 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 Reviewed-by: Kees Cook -- Kees Cook