Christian Brauner
8c199d4f1a
Have the attach helper print whether the loader enabled union filesystem resolution and assert that this agrees with the kernel BTF. Then mount the signed minimal image as an overlayfs lower layer with a tmpfs upper. On kernels with bpf_real_data_inode() executing through the overlay works while a file created in the upper layer or copied up into it is denied. Without the kfunc execution through the overlay is denied outright. The overlay uses metacopy=off so that the copy-up test really does move the data over to the untrusted upper layer. Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>
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