x86/percpu: Disable named address spaces for UBSAN_BOOL with KASAN for GCC < 14.2

GCC < 14.2 does not correctly propagate address space qualifiers
with -fsanitize=bool,enum. Together with address sanitizer then
causes that load to be sanitized.

Disable named address spaces for GCC < 14.2 when both, UBSAN_BOOL
and KASAN are enabled.

Reported-by: Matt Fleming <matt@readmodwrite.com>
Signed-off-by: Uros Bizjak <ubizjak@gmail.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20250227140715.2276353-1-ubizjak@gmail.com
Closes: https://lore.kernel.org/lkml/20241213190119.3449103-1-matt@readmodwrite.com/

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 6595b35dd52da897d9f11e3e0c8700c56f68ee29..867ec8a4a9d2f001f21a5865da062745779beb6e 100644 (file)
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -2441,18 +2441,20 @@ config CC_HAS_NAMED_AS
        def_bool $(success,echo 'int __seg_fs fs; int __seg_gs gs;' | $(CC) -x c - -S -o /dev/null)
        depends on CC_IS_GCC
 
+#
+# -fsanitize=kernel-address (KASAN) and -fsanitize=thread (KCSAN)
+# are incompatible with named address spaces with GCC < 13.3
+# (see GCC PR sanitizer/111736 and also PR sanitizer/115172).
+#
+
 config CC_HAS_NAMED_AS_FIXED_SANITIZERS
-       def_bool CC_IS_GCC && GCC_VERSION >= 130300
+       def_bool y
+       depends on !(KASAN || KCSAN) || GCC_VERSION >= 130300
+       depends on !(UBSAN_BOOL && KASAN) || GCC_VERSION >= 140200
 
 config USE_X86_SEG_SUPPORT
-       def_bool y
-       depends on CC_HAS_NAMED_AS
-       #
-       # -fsanitize=kernel-address (KASAN) and -fsanitize=thread
-       # (KCSAN) are incompatible with named address spaces with
-       # GCC < 13.3 - see GCC PR sanitizer/111736.
-       #
-       depends on !(KASAN || KCSAN) || CC_HAS_NAMED_AS_FIXED_SANITIZERS
+       def_bool CC_HAS_NAMED_AS
+       depends on CC_HAS_NAMED_AS_FIXED_SANITIZERS
 
 config CC_HAS_SLS
        def_bool $(cc-option,-mharden-sls=all)