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units: disable /sys/fs/fuse/connections in private user namespaces (#4592)

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The mount fails, even though CAP_SYS_ADMIN is granted.

Only file systems with FU_USERNS_MOUNT in .fs_flags may be mounted in userns,
and the patch to add that fusectl was rejected [1]. It would be nice if we
could check if the kernel has FU_USERNS_MOUNT for a given fs type, since this
could change over time, but this information doesn't seem to be exported.
So let's just skip this mount in userns to avoid an error during boot.

[1] https://patchwork.kernel.org/patch/2828269/
This commit is contained in:
Zbigniew Jędrzejewski-Szmek 2016-11-11 13:00:33 -05:00 committed by Lennart Poettering
parent c58bd76a6a
commit b878b618ad
1 changed files with 1 additions and 0 deletions
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units/sys-fs-fuse-connections.mount
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@ -12,6 +12,7 @@ Documentation=http://www.freedesktop.org/wiki/Software/systemd/APIFileSystems
DefaultDependencies=no
ConditionPathExists=/sys/fs/fuse/connections
ConditionCapability=CAP_SYS_ADMIN
ConditionVirtualization=!private-users
After=systemd-modules-load.service
Before=sysinit.target