-# CONFIGs
-# Linux/x86_64 5.4.0 Kernel Configuration
+# Linux/x86_64 6.1.5 Kernel Configuration
# Report BUG() conditions and kill the offending process.
CONFIG_BUG=y
CONFIG_DEBUG_NOTIFIERS=y
CONFIG_DEBUG_LIST=y
CONFIG_DEBUG_SG=y
+CONFIG_DEBUG_VIRTUAL=y
CONFIG_BUG_ON_DATA_CORRUPTION=y
CONFIG_SCHED_STACK_END_CHECK=y
CONFIG_SECCOMP=y
CONFIG_SECCOMP_FILTER=y
+# Make sure line disciplines can't be autoloaded (since v5.1).
+# CONFIG_LDISC_AUTOLOAD is not set
+
# Provide userspace with ptrace ancestry protections.
+# Make sure that "yama" is also present in the "CONFIG_LSM=yama,..." list.
CONFIG_SECURITY=y
CONFIG_SECURITY_YAMA=y
+# Provide userspace with Landlock MAC interface.
+# Make sure that "landlock" is also present in the "CONFIG_LSM=landlock,..." list.
+CONFIG_SECURITY_LANDLOCK=y
+
+# Make sure SELinux cannot be disabled trivially.
+# CONFIG_SECURITY_SELINUX_BOOTPARAM is not set
+# CONFIG_SECURITY_SELINUX_DEVELOP is not set
+# CONFIG_SECURITY_WRITABLE_HOOKS is not set
+
+# Enable "lockdown" LSM for bright line between the root user and kernel memory.
+CONFIG_SECURITY_LOCKDOWN_LSM=y
+CONFIG_SECURITY_LOCKDOWN_LSM_EARLY=y
+CONFIG_LOCK_DOWN_KERNEL_FORCE_CONFIDENTIALITY=y
+
# Perform usercopy bounds checking. (And disable fallback to gain full whitelist enforcement.)
CONFIG_HARDENED_USERCOPY=y
# CONFIG_HARDENED_USERCOPY_FALLBACK is not set
CONFIG_INIT_ON_ALLOC_DEFAULT_ON=y
CONFIG_INIT_ON_FREE_DEFAULT_ON=y
-# Initialize all stack variables on function entry. (Clang builds only. For GCC, see CONFIG_GCC_PLUGIN_STRUCTLEAK_BYREF_ALL=y below)
-CONFIG_INIT_STACK_ALL=y
+# Initialize all stack variables on function entry. (Clang and GCC 12+ builds only. For earlier GCC, see CONFIG_GCC_PLUGIN_STRUCTLEAK_BYREF_ALL=y below)
+CONFIG_INIT_STACK_ALL_ZERO=y
# Adds guard pages to kernel stacks (not all architectures support this yet).
CONFIG_VMAP_STACK=y
# Check for memory copies that might overflow a structure in str*() and mem*() functions both at build-time and run-time.
CONFIG_FORTIFY_SOURCE=y
+# Avoid kernel memory address exposures via dmesg (sets sysctl kernel.dmesg_restrict initial value to 1)
+CONFIG_SECURITY_DMESG_RESTRICT=y
+
+# Enable trapping bounds checking of array indexes (since v5.11). All the other UBSAN checks should be disabled.
+CONFIG_UBSAN=y
+CONFIG_UBSAN_TRAP=y
+CONFIG_UBSAN_BOUNDS=y
+CONFIG_UBSAN_SANITIZE_ALL=y
+# CONFIG_UBSAN_SHIFT is not set
+# CONFIG_UBSAN_DIV_ZERO is not set
+# CONFIG_UBSAN_UNREACHABLE is not set
+# CONFIG_UBSAN_BOOL is not set
+# CONFIG_UBSAN_ENUM is not set
+# CONFIG_UBSAN_ALIGNMENT is not set
+# This is only available on Clang builds, and is likely already enabled if CONFIG_UBSAN_BOUNDS=y is set:
+CONFIG_UBSAN_LOCAL_BOUNDS=y
+
+# Enable sampling-based overflow detection (since v5.12). This is similar to KASAN coverage, but with almost zero runtime overhead.
+CONFIG_KFENCE=y
+
+# Randomize kernel stack offset on syscall entry (since v5.13).
+CONFIG_RANDOMIZE_KSTACK_OFFSET_DEFAULT=y
+
+# Do not ignore compile-time warnings (since v5.15)
+CONFIG_WERROR=y
+
+# Disable DMA between EFI hand-off and the kernel's IOMMU setup.
+CONFIG_EFI_DISABLE_PCI_DMA=y
+
+# Force IOMMU TLB invalidation so devices will never be able to access stale data contents (or set "iommu.passthrough=0 iommu.strict=1" at boot)
+CONFIG_IOMMU_SUPPORT=y
+CONFIG_IOMMU_DEFAULT_DMA_STRICT=y
+
+# Enable feeding RNG entropy from TPM, if available.
+CONFIG_HW_RANDOM_TPM=y
+
+# Get as much entropy as possible from external sources. The Chacha mixer isn't vulnerable to injected entropy, so even
+# malicious sources should not cause problems.
+CONFIG_RANDOM_TRUST_BOOTLOADER=y
+CONFIG_RANDOM_TRUST_CPU=y
+
+# Make scheduler aware of SMT Cores. Program needs to opt-in to using this feature with prctl(PR_SCHED_CORE).
+CONFIG_SCHED_CORE=y
+
+# Wipe all caller-used registers on exit from the function (reduces available ROP gadgets and
+# minimizes stale data in registers). (Since v5.15)
+CONFIG_ZERO_CALL_USED_REGS=y
+
+# Wipe RAM at reboot via EFI.
+# For more details, see:
+# https://trustedcomputinggroup.org/resource/pc-client-work-group-platform-reset-attack-mitigation-specification/
+# https://bugzilla.redhat.com/show_bug.cgi?id=1532058
+CONFIG_RESET_ATTACK_MITIGATION=y
+
+# This needs userspace support, and will break "regular" distros. See: https://github.com/tych0/huldufolk
+CONFIG_STATIC_USERMODEHELPER=y
+
# Dangerous; enabling this allows direct physical memory writing.
# CONFIG_ACPI_CUSTOM_METHOD is not set
# Wipe stack contents on syscall exit (reduces stale data lifetime in stack)
CONFIG_GCC_PLUGIN_STACKLEAK=y
+# CONFIG_STACKLEAK_METRICS is not set
+# CONFIG_STACKLEAK_RUNTIME_DISABLE is not set
# Randomize the layout of system structures. This may have dramatic performance impact, so
# use with caution or also use CONFIG_GCC_PLUGIN_RANDSTRUCT_PERFORMANCE=y
CONFIG_GCC_PLUGIN_RANDSTRUCT=y
+# CONFIG_GCC_PLUGIN_RANDSTRUCT_PERFORMANCE is not set
# x86_64
# Disallow allocating the first 64k of memory.
CONFIG_DEFAULT_MMAP_MIN_ADDR=65536
+# Disable Model-Specific Register writes.
+# CONFIG_X86_MSR is not set
+
# Randomize position of kernel and memory.
CONFIG_RANDOMIZE_BASE=y
CONFIG_RANDOMIZE_MEMORY=y
# Enable Kernel Page Table Isolation to remove an entire class of cache timing side-channels.
CONFIG_PAGE_TABLE_ISOLATION=y
-# Remove additional attack surface, unless you really need them.
+# Remove additional (32-bit) attack surface, unless you really need them.
+# CONFIG_COMPAT is not set
# CONFIG_IA32_EMULATION is not set
# CONFIG_X86_X32 is not set
+# CONFIG_X86_X32_ABI is not set
# CONFIG_MODIFY_LDT_SYSCALL is not set
+# Enable chip-specific IOMMU support.
+CONFIG_INTEL_IOMMU=y
+CONFIG_INTEL_IOMMU_DEFAULT_ON=y
+CONFIG_INTEL_IOMMU_SVM=y
+CONFIG_AMD_IOMMU=y
+CONFIG_AMD_IOMMU_V2=y
+
+# Straight-Line-Speculation
+CONFIG_SLS=y
+# Enable Control Flow Integrity (since v6.1)
+CONFIG_CFI_CLANG=y
+# CONFIG_CFI_PERMISSIVE is not set
projects / kconfig-hardened-check.git / blobdiff