runsc: support for mount uid/gid mappings#13237
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Adds to the gofer-to-host RPC a mechanism for the gofer to request an id-mapped mount, which is created using open_tree() and mount_setattr(). The gofer then calls move_mount() to place the mount in the sandbox's directory hierarchy, and calls mount_setattr() once again to configure the mount. ID-mapped mounts are only valid if at least one UID *and* GID mapping is specified. PiperOrigin-RevId: 919268146
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runsc: support for mount uid/gid mappings
Adds to the gofer-to-host RPC a mechanism for the gofer to request an id-mapped
mount, which is created using open_tree() and mount_setattr(). The gofer then
calls move_mount() to place the mount in the sandbox's directory hierarchy,
and calls mount_setattr() once again to configure the mount.
ID-mapped mounts are only valid if at least one UID and GID mapping is
specified.