Christian Brauner
e37151765f
Probe the kernel BTF for bpf_real_data_inode() and set the BPF program's .rodata flag accordingly. The flag has to be written for every open of the skeleton because .rodata is frozen once the object is loaded, so fold the two open and load attempts into a common helper. A positive BTF probe isn't a guarantee. It tells us that the function exists, not that it is registered as an LSM kfunc with the signature we expect. So if loading with resolution enabled fails anyway, retry with the flag off. Files on union filesystems are then denied like they were before which is a lot better than turning kernel drift into a boot failure. Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>
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