907046282c
Linux kernel's bpf-next contains BPF LSM support for s390x. systemd's test-bpf-lsm currently fails with this kernel. This is an endianness issue: in the restrict_fs bpf program, magic_number has type unsigned long (64 bits on s390x), but magic_map keys are uint32_t (32 bits). Accessing magic_map using 64-bit keys may work by accident on little-endian systems, but fails hard on big-endian ones. Fix by casting magic_number to uint32_t.
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