On Tue, Sep 15, 2020 at 11:27 AM Borislav Petkov <b...@alien8.de> wrote: > > I believe the kernel makes a questionable assumption on how clang > > uses registers (gs will not be used if stack protection is disabled). > > Both kernel and clang behaves unfortunate here. > > If the kernel is at fault here and this same thing happens with GCC, > sure, but this is a clang-specific fix.
This is fair. Unfortunately I am not an x86 asm expert. I expect the proper fix should land into arch/x86/kernel/acpi/wakeup_64.S to init %gs (maybe some more registers) before "jmp restore_processor_state". Regards, Roman.
