Messages in this thread | | | From | (Eric W. Biederman) | Date | Sat, 12 Jun 2021 14:44:05 -0500 | Subject | Re: [PATCHv8] exec: Fix dead-lock in de_thread with ptrace_attach |
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Andrew Morton <akpm@linux-foundation.org> writes:
> On Thu, 10 Jun 2021 09:31:42 +0200 Bernd Edlinger <bernd.edlinger@hotmail.de> 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
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