Re: [PATCH] seccomp: add ptrace commands for suspend/resume

[Andrey Wagin]

2015-06-01 22:28 GMT+03:00 Tycho Andersen <tycho.andersen@xxxxxxxxxxxxx>:
> This patch is the first step in enabling checkpoint/restore of processes
> with seccomp enabled.
>
> One of the things CRIU does while dumping tasks is inject code into them
> via ptrace to collect information that is only available to the process
> itself. However, if we are in a seccomp mode where these processes are
> prohibited from making these syscalls, then what CRIU does kills the task.
>
> This patch adds a new ptrace command, PTRACE_SUSPEND_SECCOMP that enables a
> task from the init user namespace which has CAP_SYS_ADMIN to disable (and
> re-enable) seccomp filters for another task so that they can be
> successfully dumped (and restored).

Do we need to re-enable seccomp if a tracer detaches unexpectedly.
CRIU can be killed and we should try to not affect the task state even
in this case.

Thanks,
Andrew
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