diff options
Diffstat (limited to 'arch/Kconfig')
| -rw-r--r-- | arch/Kconfig | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/arch/Kconfig b/arch/Kconfig index fd18b7db2c777..9f066785bb71d 100644 --- a/arch/Kconfig +++ b/arch/Kconfig @@ -799,7 +799,7 @@ config CFI_CLANG depends on ARCH_SUPPORTS_CFI_CLANG depends on $(cc-option,-fsanitize=kcfi) help - This option enables Clang’s forward-edge Control Flow Integrity + This option enables Clang's forward-edge Control Flow Integrity (CFI) checking, where the compiler injects a runtime check to each indirect function call to ensure the target is a valid function with the correct static type. This restricts possible call targets and @@ -1597,4 +1597,16 @@ config FUNCTION_ALIGNMENT default 4 if FUNCTION_ALIGNMENT_4B default 0 +config CC_HAS_MIN_FUNCTION_ALIGNMENT + # Detect availability of the GCC option -fmin-function-alignment which + # guarantees minimal alignment for all functions, unlike + # -falign-functions which the compiler ignores for cold functions. + def_bool $(cc-option, -fmin-function-alignment=8) + +config CC_HAS_SANE_FUNCTION_ALIGNMENT + # Set if the guaranteed alignment with -fmin-function-alignment is + # available or extra care is required in the kernel. Clang provides + # strict alignment always, even with -falign-functions. + def_bool CC_HAS_MIN_FUNCTION_ALIGNMENT || CC_IS_CLANG + endmenu |