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

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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/
This commit is contained in:
Uros Bizjak 2025-02-27 15:06:58 +01:00 committed by Ingo Molnar
parent 79165720f3
commit b6762467a0
1 changed files with 11 additions and 9 deletions
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20
arch/x86/Kconfig
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@ -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)