tunaichao
55fb3fcf99
The clear-store in restrict_fsaccess_clear_initramfs_trust() writes a fixed 4 bytes (*(uint32_t *)(p + INITRAMFS_S_DEV_OFF) = 0). INITRAMFS_S_DEV_OFF is derived from the skeleton, so the offset tracks any field widening, but the store width does not: were initramfs_s_dev widened (e.g. __u32 -> __u64) in the BPF program, the store would clear only the low 4 bytes and silently leave the initramfs trust window partially open. That is exactly the class of bug the mirror-struct asserts (removed earlier in this branch) guarded against. Add a compile-time assert pinning the store width to the skeleton field width (sizeof_field(typeof_field(struct restrict_fsaccess_bpf, bss[0]), initramfs_s_dev) == sizeof(uint32_t)), so widening the field fails the build instead of clearing half of it.
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