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    SubjectRe: plan9 semantics on Linux - mount namespaces
    On 2018-02-14, Enrico Weigelt <lkml@metux.net> wrote:
    > On 14.02.2018 04:54, Aleksa Sarai wrote:
    >
    > > It depends how old your kernel is and what distro you use. Arch Linux >
    > > disables user namespaces entirely, Debian requires that you set a
    > sysctl> to enable unprivileged user namespaces, and RHEL requires you to
    > set> both a sysctl and a kernel boot-flag. Also check how old your kernel
    > is> (unprivileged user namespace support was added in 3.8).
    > Just tried on a mainline kernel (4.15). Same problem:
    >
    > root@alphabox:~ unshare -U -r
    > unshare: unshare(0x14000000): Invalid argument
    > root@alphabox:/proc/sys/user cat max_user_namespaces
    > 5922

    What distribution are you using and which release? Also, are you trying
    to do this inside a Docker container or something similar (Docker has
    seccomp filters that block CLONE_NEWUSER by default, for instance).

    --
    Aleksa Sarai
    Senior Software Engineer (Containers)
    SUSE Linux GmbH
    <https://www.cyphar.com/>
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