Messages in this thread Patch in this message | | | Date | Wed, 13 Oct 2021 11:16:56 -0700 | Subject | [PATCH v5 13/15] x86, cpu: Use LTO for cpu.c with CFI | From | Sami Tolvanen <> |
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Allow LTO to be used for cpu.c when CONFIG_CFI_CLANG is enabled to avoid indirect call failures. CFI requires Clang >= 13, which doesn't have the stack protector inlining bug.
Signed-off-by: Sami Tolvanen <samitolvanen@google.com> Reviewed-by: Kees Cook <keescook@chromium.org> Reviewed-by: Nick Desaulniers <ndesaulniers@google.com> Tested-by: Nick Desaulniers <ndesaulniers@google.com> Tested-by: Sedat Dilek <sedat.dilek@gmail.com> --- arch/x86/power/Makefile | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/arch/x86/power/Makefile b/arch/x86/power/Makefile index 379777572bc9..a0532851fed7 100644 --- a/arch/x86/power/Makefile +++ b/arch/x86/power/Makefile @@ -4,9 +4,11 @@ # itself be stack-protected CFLAGS_cpu.o := -fno-stack-protector +ifndef CONFIG_CFI_CLANG # Clang may incorrectly inline functions with stack protector enabled into # __restore_processor_state(): https://bugs.llvm.org/show_bug.cgi?id=47479 CFLAGS_REMOVE_cpu.o := $(CC_FLAGS_LTO) +endif obj-$(CONFIG_PM_SLEEP) += cpu.o obj-$(CONFIG_HIBERNATION) += hibernate_$(BITS).o hibernate_asm_$(BITS).o hibernate.o -- 2.33.0.1079.g6e70778dc9-goog
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