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kcfi: Rename CONFIG_CFI_CLANG to CONFIG_CFI

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The kernel's CFI implementation uses the KCFI ABI specifically, and is
not strictly tied to a particular compiler. In preparation for GCC
supporting KCFI, rename CONFIG_CFI_CLANG to CONFIG_CFI (along with
associated options).

Use new "transitional" Kconfig option for old CONFIG_CFI_CLANG that will
enable CONFIG_CFI during olddefconfig.

Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Nathan Chancellor <nathan@kernel.org>
Link: https://lore.kernel.org/r/20250923213422.1105654-3-kees@kernel.org
Signed-off-by: Kees Cook <kees@kernel.org>
This commit is contained in:
Kees Cook
2025-09-23 14:34:19 -07:00
parent f9afce4f32
commit 23ef9d4397
55 changed files with 100 additions and 90 deletions
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2
kernel/module/Kconfig
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@@ -460,6 +460,6 @@ config UNUSED_KSYMS_WHITELIST
config MODULES_TREE_LOOKUP
def_bool y
depends on PERF_EVENTS || TRACING || CFI_CLANG
depends on PERF_EVENTS || TRACING || CFI
endif # MODULES

2
kernel/module/tree_lookup.c
View File

@@ -14,7 +14,7 @@
* Use a latched RB-tree for __module_address(); this allows us to use
* RCU lookups of the address from any context.
*
* This is conditional on PERF_EVENTS || TRACING || CFI_CLANG because those can
* This is conditional on PERF_EVENTS || TRACING || CFI because those can
* really hit __module_address() hard by doing a lot of stack unwinding;
* potentially from NMI context.
*/