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Edgecombe" , Deepak Gupta , Ard Biesheuvel , Szabolcs Nagy Cc: "H.J. Lu" , Paul Walmsley , Palmer Dabbelt , Albert Ou , 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-099c9 X-Developer-Signature: v=1; a=openpgp-sha256; l=1333; i=broonie@kernel.org; h=from:subject:message-id; bh=pU/Cpaxis09XYO6pS+Tm9irl4OV1fzcTdHAFs+JXaiE=; b=owEBbQGS/pANAwAKASTWi3JdVIfQAcsmYgBktGajNEQmje9r0OAkZ6IXOyAN5ruAxFmeetfHxjAC LDyTfAyJATMEAAEKAB0WIQSt5miqZ1cYtZ/in+ok1otyXVSH0AUCZLRmowAKCRAk1otyXVSH0JhGB/ 4uEom4k4x+430HQzhyHP2BDhwiv0Xo2K1mTO20ue7Lk8Wti2gS+bFt3j5ucEpMEwtZzUpbv9aFHg8g yVDFSa62TJm4VnlCyDGJgQ8tJrySIzQDdUWaW4NsZkCYMvzaHn7Io9BSwTN7Zseo4HDAFXeuVN+KcI 6W/YOWtqN+FpSOZSkAOtNDCCtHC+Bnwr5v6a6FDSO91/wXPICZ9z5JG71wr/l8ddWrbzhdD+2lp/5O sqSoPHL3zXgrAcCHuCXDKtfj+XAC/YXjHy8TdZgS0bh4tp9AbE5iob7yXE/SpJfC8W3JOO8pyrZA3r LZHn0cmojWthyoDyKu+QYIQJkyHsLU X-Developer-Key: i=broonie@kernel.org; a=openpgp; fpr=3F2568AAC26998F9E813A1C5C3F436CA30F5D8EB X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF, RCVD_IN_DNSWL_BLOCKED,SPF_HELO_NONE,SPF_PASS,T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1771616731946046798 X-GMAIL-MSGID: 1771616731946046798 Provide a Kconfig option allowing the user to select if GCS support is built into the kernel. Signed-off-by: Mark Brown --- arch/arm64/Kconfig | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index 7856c3a3e35a..e1aeeda13c52 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -2091,6 +2091,25 @@ 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_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 # "2022 archiectural features" + config ARM64_SVE bool "ARM Scalable Vector Extension support" default y