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R. Silva" Cc: Kees Cook , Catalin Marinas , Will Deacon , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H. Peter Anvin" , Nathan Chancellor , Nick Desaulniers , Bill Wendling , Justin Stitt , linux-hardening@vger.kernel.org, linux-arm-kernel@lists.infradead.org, llvm@lists.linux.dev, linux-kernel@vger.kernel.org Subject: [PATCH] hardening: Refresh KCFI options, add some more Date: Fri, 26 Apr 2024 15:29:44 -0700 Message-Id: <20240426222940.work.884-kees@kernel.org> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=3198; i=keescook@chromium.org; h=from:subject:message-id; bh=/JAZTw8Az0ztBUDk0sA4JmrZ5DFUfKzaFS+/N6fB7wg=; b=owEBbQKS/ZANAwAKAYly9N/cbcAmAcsmYgBmLCrX8Y9C46/LOVocPQD+qsoHgG7tK3cJ+oBHy rHReedMZSOJAjMEAAEKAB0WIQSlw/aPIp3WD3I+bhOJcvTf3G3AJgUCZiwq1wAKCRCJcvTf3G3A JsqaD/sHGOQsjFazK/JXw46/Wv4E4bcBtjgtHgo9OCskfnXNqnz0P4c9gHMNMWYw/p4ub+t4+bx wzzstZOSmhYV811Gx0vJ2ulo0jPPnh8y6/2x9nkGkvWgrtWxiNlHvOmJMSv9fGi8vP3exHn6CCG BUaxsodIlWT5neJdhD58ePBffk+31Og+gHc5/WD2Gng3env+B/4okSiDxsAqA1hgMmrvYbzFX3d EnzewxsoW2SV8Bwt/QP8QajLjiSy11N8sRwXD+rBRzJ/ay1lBJh9iGNMwRi+/b4yI3/tEiYfU1U FFwrNDQcr4zsU0LxFHx2PRjc44yfRrYYAJ3cp5gwpD6LpP8XcYyoio9gbIbe3wpTAcgIu1fsOQK d7mdnmP+1D6CNCQAOpVIk51N72SSC3cT7HTxCY/LjXycHo27tMZYehu6xV5ePlB75cUWq8bM4rC tGP/LbmOiQf9tg9vYWOSBi3Iyxu1sktbYrjp9HMToikeKYnbLz/5yVklefYALIS+z6RoQJPg3Ho vqV4lSwin4S08KSoVpJuAPdWTdt4XhpYTLl2avGVt0gsmcZpF2RQc6LdYIHIPq3A68lpxRztPRQ aRsWgfhBD2CTUhRRZjeJU4RwzGYeE27Orz5Ygo65aJqqmcuvlCIWtSVbc5Ns9QexMHAHLhzASPj hgh8L94 FruAYSaQ== X-Developer-Key: i=keescook@chromium.org; a=openpgp; fpr=A5C3F68F229DD60F723E6E138972F4DFDC6DC026 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Add some stuff that got missed along the way: - CONFIG_UNWIND_PATCH_PAC_INTO_SCS=3Dy so SCS vs PAC is hardware selectable. - CONFIG_X86_KERNEL_IBT=3Dy while a default, just be sure. - CONFIG_CFI_CLANG=3Dy for x86 and arm64. (And disable FINEIBT since it isn't as secure as straight KCFI.) - CONFIG_PAGE_TABLE_CHECK=3Dy for userspace mapping sanity. Signed-off-by: Kees Cook Reviewed-by: Nathan Chancellor --- Cc: "Gustavo A. R. Silva" Cc: Catalin Marinas Cc: Will Deacon Cc: Thomas Gleixner Cc: Ingo Molnar Cc: Borislav Petkov Cc: Dave Hansen Cc: x86@kernel.org Cc: "H. Peter Anvin" Cc: Nathan Chancellor Cc: Nick Desaulniers Cc: Bill Wendling Cc: Justin Stitt Cc: linux-hardening@vger.kernel.org Cc: linux-arm-kernel@lists.infradead.org Cc: llvm@lists.linux.dev --- arch/arm64/configs/hardening.config | 5 +++++ arch/x86/configs/hardening.config | 9 +++++++++ kernel/configs/hardening.config | 4 ++++ 3 files changed, 18 insertions(+) diff --git a/arch/arm64/configs/hardening.config b/arch/arm64/configs/harde= ning.config index b0e795208998..e8a18fec7a3e 100644 --- a/arch/arm64/configs/hardening.config +++ b/arch/arm64/configs/hardening.config @@ -5,6 +5,7 @@ CONFIG_ARM64_SW_TTBR0_PAN=3Dy =20 # Software Shadow Stack or PAC CONFIG_SHADOW_CALL_STACK=3Dy +CONFIG_UNWIND_PATCH_PAC_INTO_SCS=3Dy =20 # Pointer authentication (ARMv8.3 and later). If hardware actually supports # it, one can turn off CONFIG_STACKPROTECTOR_STRONG with this enabled. @@ -20,3 +21,7 @@ CONFIG_ARM64_E0PD=3Dy =20 # Available in ARMv8.7 and later. CONFIG_ARM64_EPAN=3Dy + +# Enable Kernel Control Flow Integrity (currently Clang only). +CONFIG_CFI_CLANG=3Dy +# CONFIG_CFI_PERMISSIVE is not set diff --git a/arch/x86/configs/hardening.config b/arch/x86/configs/hardening= .config index 7b497f3b7bc3..b47e5f411dd3 100644 --- a/arch/x86/configs/hardening.config +++ b/arch/x86/configs/hardening.config @@ -10,5 +10,14 @@ CONFIG_INTEL_IOMMU_DEFAULT_ON=3Dy CONFIG_INTEL_IOMMU_SVM=3Dy CONFIG_AMD_IOMMU=3Dy =20 +# Enforce CET Indirect Branch Tracking in the kernel. +CONFIG_X86_KERNEL_IBT=3Dy + +# Enable Kernel Control Flow Integrity (currently Clang only), but disable +# weaker FINEIBT landing pads. +CONFIG_CFI_CLANG=3Dy +# CONFIG_CFI_PERMISSIVE is not set +# CONFIG_FINEIBT is not set + # Enable CET Shadow Stack for userspace. CONFIG_X86_USER_SHADOW_STACK=3Dy diff --git a/kernel/configs/hardening.config b/kernel/configs/hardening.con= fig index 7a5bbfc024b7..4be0de1f085c 100644 --- a/kernel/configs/hardening.config +++ b/kernel/configs/hardening.config @@ -23,6 +23,10 @@ CONFIG_SLAB_FREELIST_HARDENED=3Dy CONFIG_SHUFFLE_PAGE_ALLOCATOR=3Dy CONFIG_RANDOM_KMALLOC_CACHES=3Dy =20 +# Sanity check userspace page table mappings. +CONFIG_PAGE_TABLE_CHECK=3Dy +CONFIG_PAGE_TABLE_CHECK_ENFORCED=3Dy + # Randomize kernel stack offset on syscall entry. CONFIG_RANDOMIZE_KSTACK_OFFSET_DEFAULT=3Dy =20 --=20 2.34.1