On Fri, Dec 02, 2022 at 04:35:53PM -0800, Rick Edgecombe wrote: > From: Yu-cheng Yu <yu-cheng.yu@xxxxxxxxx> > > Introduce basic shadow stack enabling/disabling/allocation routines. > A task's shadow stack is allocated from memory with VM_SHADOW_STACK flag > and has a fixed size of min(RLIMIT_STACK, 4GB). > > Keep the task's shadow stack address and size in thread_struct. This will > be copied when cloning new threads, but needs to be cleared during exec, > so add a function to do this. > > Do not support IA32 emulation or x32. > > Tested-by: Pengfei Xu <pengfei.xu@xxxxxxxxx> > Tested-by: John Allen <john.allen@xxxxxxx> > Signed-off-by: Yu-cheng Yu <yu-cheng.yu@xxxxxxxxx> Reviewed-by: Kees Cook <keescook@xxxxxxxxxxxx> -- Kees Cook
