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Date:   Wed, 22 Feb 2017 19:06:17 -0800
From:   Andy Lutomirski <>
To:     "Eric W. Biederman" <>
Cc:     Aleksa Sarai <>,
        Linus Torvalds <>,
        Linux FS Devel <>,
        Linux API <>,
        Linux Containers <>,
        "" <>
Subject: Re: [GIT PULL] namespaces related fixes for v4.11-rc1

On Wed, Feb 22, 2017 at 5:29 PM, Eric W. Biederman
<> wrote:
> Aleksa Sarai <> writes:
>>> The only known user of this prctl systemd
>>> forks all children after the prctl.  So no userspace regressions will
>>> occur.
>> Note that runC and containerd (and thus Docker) as well as cri-o use the prctl
>> as well -- to be able to collect exit codes from a non-child process (namely to
>> collect the exit code from PID 1 in the container).
> Are any of those affected by the change?  I would not expect so.  As it
> would require having children or grand children whose exit codes you
> don't want to collect.

FWIW, I have private code that uses PR_SET_CHILD_SUBREAPER, too.  I
don't see why it would be affected by this change.

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