On Mon, Sep 03, 2018 at 02:45:25PM +0200, Jiri Kosina wrote: > if (tsk && tsk->mm && > tsk->mm->context.ctx_id != last_ctx_id && > - get_dumpable(tsk->mm) != SUID_DUMP_USER) > + ___ptrace_may_access(tsk, current, PTRACE_MODE_IBPB)) > indirect_branch_prediction_barrier();
So the question posed here is: can @next ptrace @prev? Which confuses me greatly; it is @prev doing the BTB poisoning for @next, so we want to know if @prev can ptrace @next, no?
