lkml.org 
[lkml]   [2021]   [Jun]   [22]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
Date
SubjectRe: Kernel stack read with PTRACE_EVENT_EXIT and io_uring threads
On Tue, Jun 22, 2021 at 1:53 PM Eric W. Biederman <ebiederm@xmission.com> wrote:
>
> Playing with it some more I think I have everything working working
> except for PTRACE_EVENT_SECCOMP (which can stay ptrace_event) and
> group_exit(2).
>
> Basically in exit sending yourself a signal and then calling do_exit
> from the signal handler is not unreasonable, as exit is an ordinary
> system call.

Ok, this is a bit odd, but I do like the concept of just making
ptrace_event just post a signal, and have all ptrace things always be
handled at signal time (or the special system call entry/exit, which
is fine too).

> For purposes of discussion this is my current draft implementation.

I didn't check what is so different about exit_group() that you left
that as an exercise for the reader, but if that ends up then removing
the whole "wait synchromously for ptrace" cases for good I don't
_hate_ this. It's a bit odd, but it would be really nice to limit
where ptrace picks up data.

We do end up doing that stuff in "get_signal()", and that means that
we have the interaction with io_uring calling it directly, but it's at
least not a new thing.

Linus

\
 
 \ /
  Last update: 2021-06-23 02:43    [W:0.260 / U:0.108 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site