Iago Lopez Galeiras
184b4f78cf
This adds 6 functions to implement RestrictFileSystems= * lsm_bpf_supported() checks if LSM BPF is supported. It checks that cgroupv2 is used, that BPF LSM is enabled, and tries to load the BPF LSM program which makes sure BTF and hash of maps are supported, and BPF LSM programs can be loaded. * lsm_bpf_setup() loads and attaches the LSM BPF program. * lsm_bpf_unit_restrict_filesystems() populates the hash of maps BPF map with the cgroupID and the set of allowed or denied filesystems. * lsm_bpf_cleanup() removes a cgroupID entry from the hash of maps. * lsm_bpf_map_restrict_fs_fd() is a helper function to get the file descriptor of the BPF map. * lsm_bpf_destroy() is a wrapper around the destroy function of the BPF skeleton file.
System and Service Manager
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