52 lines
1.9 KiB
Text
52 lines
1.9 KiB
Text
# snapuserd - Daemon for servicing dm-user requests for Virtual A/B snapshots.
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type snapuserd, domain;
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type snapuserd_exec, exec_type, file_type, system_file_type;
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typeattribute snapuserd coredomain;
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init_daemon_domain(snapuserd)
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allow snapuserd kmsg_device:chr_file rw_file_perms;
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# Allow snapuserd to reach block devices in /dev/block.
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allow snapuserd block_device:dir search;
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# Read /sys/block to find all the DM directories like (/sys/block/dm-X).
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allow snapuserd sysfs:dir { open read };
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# Read /sys/block/dm-X/dm/name (which is a symlink to
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# /sys/devices/virtual/block/dm-X/dm/name) to identify the mapping between
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# dm-X and dynamic partitions.
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allow snapuserd sysfs_dm:dir { open read search };
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allow snapuserd sysfs_dm:file r_file_perms;
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# Reading and writing to /dev/block/dm-* (device-mapper) nodes.
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allow snapuserd block_device:dir r_dir_perms;
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allow snapuserd dm_device:chr_file rw_file_perms;
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allow snapuserd dm_device:blk_file rw_file_perms;
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# Reading and writing to dm-user control nodes.
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allow snapuserd dm_user_device:dir r_dir_perms;
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allow snapuserd dm_user_device:chr_file rw_file_perms;
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# Reading and writing to /dev/socket/snapuserd and snapuserd_proxy.
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allow snapuserd snapuserd_socket:unix_stream_socket { accept listen getattr read write };
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allow snapuserd snapuserd_proxy_socket:sock_file write;
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# This arises due to first-stage init opening /dev/null without F_CLOEXEC
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# (see SetStdioToDevNull in init). When we fork() and execveat() snapuserd
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# again, the descriptor leaks into the new process.
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allow snapuserd kernel:fd use;
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# snapuserd.* properties
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set_prop(snapuserd, snapuserd_prop)
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# For inotify watching for /dev/socket/snapuserd_proxy to appear.
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allow snapuserd tmpfs:dir { read watch };
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# Forbid anything other than snapuserd and init setting snapuserd properties.
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neverallow {
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domain
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-snapuserd
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-init
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} snapuserd_prop:property_service set;
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