On Sat, 2022-12-03 at 14:49 -0800, Andy Lutomirski wrote: > 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. Thanks for the suggestion! Denying seems much better, I'll change it.
