G'day! The original cover letter providing background context and motivating factors around the needs for these new VFS related BPF kfuncs introduced within this patch series can be found here [0]. Please do reference that if needed. The changes contained within this version of the patch series mainly came at the back of discussions held with Christian at LSFMMBPF recently. In summary, the primary difference within this patch series when compared to the last [1] is that I've reduced the number of VFS related BPF kfuncs being introduced, housed them under fs/, and added more selftests. Changes since v2 [1]: * All new VFS related BPF kfuncs now reside in fs/bpf_fs_kfuncs.c rather than kernel/trace/bpf_trace.c. This was something that was explicitly requested by Christian after discussing these new VFS related BPF kfuncs recently at LSFMMBPF. * Dropped other initially proposed VFS related BPF kfuncs, including bpf_get_mm_exe_file(), bpf_get_task_fs_root(), bpf_get_task_fs_pwd(), and bpf_put_path(). * bpf_path_d_path() now makes use of __sz argument annotations such that the BPF verifier can enforce relevant size checks on the supplied buf that ends up being passed to d_path(). Relevant selftests have been added to assert __sz checking semantics are enforced. [0] https://lore.kernel.org/bpf/cover.1708377880.git.mattbobrowski@xxxxxxxxxx/ [1] https://lore.kernel.org/bpf/cover.1709675979.git.mattbobrowski@xxxxxxxxxx/ Matt Bobrowski (3): bpf: introduce new VFS based BPF kfuncs selftests/bpf: add negative tests for new VFS based BPF kfuncs selftests/bpf: add positive tests for new VFS based BPF kfuncs fs/Makefile | 1 + fs/bpf_fs_kfuncs.c | 133 ++++++++++++ .../testing/selftests/bpf/bpf_experimental.h | 26 +++ .../selftests/bpf/prog_tests/verifier.c | 4 + .../selftests/bpf/progs/verifier_vfs_accept.c | 71 +++++++ .../selftests/bpf/progs/verifier_vfs_reject.c | 196 ++++++++++++++++++ 6 files changed, 431 insertions(+) create mode 100644 fs/bpf_fs_kfuncs.c create mode 100644 tools/testing/selftests/bpf/progs/verifier_vfs_accept.c create mode 100644 tools/testing/selftests/bpf/progs/verifier_vfs_reject.c -- 2.46.0.rc1.232.g9752f9e123-goog
