diff options
| author | Uros Bizjak <ubizjak@gmail.com> | 2025-02-27 15:06:58 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2025-02-27 19:24:48 +0100 |
| commit | b6762467a09ba8838c499e4f36561e82fc608ed1 (patch) | |
| tree | 33f5cff94744b3b3345c550ab3eb1b3119d64c1d | |
| parent | 79165720f31868d9a9f7e5a50a09d5fe510d1822 (diff) | |
| download | lwn-b6762467a09ba8838c499e4f36561e82fc608ed1.tar.gz lwn-b6762467a09ba8838c499e4f36561e82fc608ed1.zip | |
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/
| -rw-r--r-- | arch/x86/Kconfig | 20 |
1 files changed, 11 insertions, 9 deletions
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 6595b35dd52d..867ec8a4a9d2 100644 --- 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) |