6.12-stable review patch. If anyone has any objections, please let me know.
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From: Uros Bizjak ubizjak@gmail.com
[ Upstream commit b6762467a09ba8838c499e4f36561e82fc608ed1 ]
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/ Signed-off-by: Sasha Levin sashal@kernel.org --- arch/x86/Kconfig | 20 +++++++++++--------- 1 file changed, 11 insertions(+), 9 deletions(-)
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index db38d2b9b7886..e54da3b4d334e 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -2434,18 +2434,20 @@ 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)