Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> writes: > On Thu, 10 Jun 2021 09:31:42 +0200 Bernd Edlinger <bernd.edlinger@xxxxxxxxxx> wrote: > >> This introduces signal->unsafe_execve_in_progress, >> which is used to fix the case when at least one of the >> sibling threads is traced, and therefore the trace >> process may dead-lock in ptrace_attach, but de_thread >> will need to wait for the tracer to continue execution. > > Deadlocks are serious. Is this exploitable by unprivileged userspace? The processes are killable so I don't think this is the serious in the way you mean. In fact Linus has already said that it is not a deadlock. Eric
