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

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Message-ID: <CANaxB-zacYuo21jLVZyEfyf=UdDnTjYvHdgNpfL+c_DXWRz-eg@mail.gmail.com>
Date:	Tue, 2 Jun 2015 12:36:16 +0300
From:	Andrey Wagin <avagin@...il.com>
To:	Tycho Andersen <tycho.andersen@...onical.com>
Cc:	LKML <linux-kernel@...r.kernel.org>, linux-api@...r.kernel.org,
	Kees Cook <keescook@...omium.org>,
	Andy Lutomirski <luto@...capital.net>,
	Will Drewry <wad@...omium.org>,
	Roland McGrath <roland@...k.frob.com>,
	Oleg Nesterov <oleg@...hat.com>,
	Pavel Emelyanov <xemul@...allels.com>,
	"Serge E. Hallyn" <serge.hallyn@...ntu.com>
Subject: Re: [PATCH] seccomp: add ptrace commands for suspend/resume

2015-06-01 22:28 GMT+03:00 Tycho Andersen <tycho.andersen@...onical.com>:
> 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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