diff options
| author |   Sami Tolvanen <samitolvanen@google.com> | 2020-09-16 12:57:56 -0700 |
|---|---|---|
| committer |   Kees Cook <keescook@chromium.org> | 2021-02-23 12:46:58 -0800 |
| commit | d2dcd3e37475a66012f9702c4f9f0863ccdae716 (patch) | |
| tree | 2830346f66896f32a6fe5f87b46b50fb6e8c123b /arch/x86/power | |
| parent | x86, vdso: disable LTO only for vDSO (diff) | |
| download | linux-dev-d2dcd3e37475a66012f9702c4f9f0863ccdae716.tar.xz linux-dev-d2dcd3e37475a66012f9702c4f9f0863ccdae716.zip | |
x86, cpu: disable LTO for cpu.c
Clang incorrectly inlines functions with differing stack protector
attributes, which breaks __restore_processor_state() that relies on
stack protector being disabled. This change disables LTO for cpu.c
to work aroung the bug.
Link: https://bugs.llvm.org/show_bug.cgi?id=47479
Suggested-by: Nick Desaulniers <ndesaulniers@google.com>
Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
Diffstat (limited to 'arch/x86/power')
| -rw-r--r-- | arch/x86/power/Makefile | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/x86/power/Makefile b/arch/x86/power/Makefile index 6907b523e856..5f711a441623 100644 --- a/arch/x86/power/Makefile +++ b/arch/x86/power/Makefile @@ -5,5 +5,9 @@ OBJECT_FILES_NON_STANDARD_hibernate_asm_$(BITS).o := y # itself be stack-protected CFLAGS_cpu.o := -fno-stack-protector +# 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 := $(CC_FLAGS_LTO) + obj-$(CONFIG_PM_SLEEP) += cpu.o obj-$(CONFIG_HIBERNATION) += hibernate_$(BITS).o hibernate_asm_$(BITS).o hibernate.o |