bpf path iterator #9134
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bpf path iterator #9134
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This helper walks an input path to its parent. Logic are added to handle walking across mount tree. This will be used by landlock, and BPF LSM. Suggested-by: Neil Brown <[email protected]> Signed-off-by: Song Liu <[email protected]>
Use path_walk_parent() to walk a path up to its parent. No functional changes intended. Signed-off-by: Song Liu <[email protected]>
Introduce a path iterator, which walks a struct path toward the root. This path iterator is based on path_walk_parent. A fixed zero'ed root is passed to path_walk_parent(). Therefore, unless the user terminates it earlier, the iterator will terminate at the real root. Signed-off-by: Song Liu <[email protected]> Acked-by: Andrii Nakryiko <[email protected]>
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Add tests for bpf path iterator, including test cases similar to real workload (call bpf_path_d_path and bpf_get_dentry_xattr), and test cases where the verifier rejects invalid use of the iterator. Signed-off-by: Song Liu <[email protected]>
Add an end-to-end test with path_iter on security hook file_open. A test file is created in folder /tmp/test_progs_path_iter/folder. On file_open, walk file->f_path up to its parent and grand parent, and test bpf_get_dentry_xattr and bpf_path_d_path on the folders. Signed-off-by: Song Liu <[email protected]>
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At least one diff in series https://patchwork.kernel.org/project/netdevbpf/list/?series=972802 expired. Closing PR. |
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Pull request for series with
subject: bpf path iterator
version: 5
url: https://patchwork.kernel.org/project/netdevbpf/list/?series=972802