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criu(8): Add info about unprivileged mode limitations

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Signed-off-by: Younes Manton <ymanton@ca.ibm.com>
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Younes Manton 2022-12-16 08:55:55 -08:00 • committed by Andrei Vagin
parent 80528dbf72
commit cec43025ac
1 changed files with 10 additions and 0 deletions
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Documentation/criu.txt
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@ -906,6 +906,16 @@ Currently *criu* can benefit from the following additional capabilities:
- *CAP_SETUID*
- *CAP_SYS_RESOURCE*
Note that for some operations, having a capability in a namespace other than
the init namespace (i.e. the default/root namespace) is not sufficient. For
example, in order to read symlinks in proc/[pid]/map_files CRIU requires
CAP_CHECKPOINT_RESTORE in the init namespace; having CAP_CHECKPOINT_RESTORE
while running in another user namespace (e.g. in a container) does not allow
CRIU to read symlinks in /proc/[pid]/map_files.
Without access to /proc/[pid]/map_files checkpointing/restoring processes
that have mapped deleted files may not be possible.
Independent of the capabilities it is always necessary to use "*--unprivileged*" to
accept *criu*'s limitation in non-root mode.