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- .. SPDX-License-Identifier: GPL-2.0
- .. _fs_kfuncs-header-label:
- =====================
- BPF filesystem kfuncs
- =====================
- BPF LSM programs need to access filesystem data from LSM hooks. The following
- BPF kfuncs can be used to get these data.
- * ``bpf_get_file_xattr()``
- * ``bpf_get_fsverity_digest()``
- To avoid recursions, these kfuncs follow the following rules:
- 1. These kfuncs are only permitted from BPF LSM function.
- 2. These kfuncs should not call into other LSM hooks, i.e. security_*(). For
- example, ``bpf_get_file_xattr()`` does not use ``vfs_getxattr()``, because
- the latter calls LSM hook ``security_inode_getxattr``.
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