On Fri, Dec 2, 2022 at 4:44 PM Rick Edgecombe <rick.p.edgecombe@xxxxxxxxx> wrote: > > So since 32 bit is not easy to support, and there are likely not many > users. More cleanly don't support 32 bit signals in a 64 bit address > space by not allowing 32 bit ABI signal handlers when shadow stack is > enabled. Do this by clearing any 32 bit ABI signal handlers when shadow > stack is enabled, and disallow any further 32 bit ABI signal handlers. > Also, return an error code for the clone operations when in a 32 bit > syscall. > This seems unfortunate. The result will be a highly incomprehensible crash. Maybe instead deny enabling shadow stack in the first place? Or at least pr_warn_once if anything gets flushed.
