bpf inode local storage can be useful beyond LSM programs. For example, bcc/libbpf-tools file* can use inode local storage to simplify the logic. This set makes inode local storage available to tracing program. 1/4 is missing change for bpf task local storage. 2/4 move inode local storage from security blob to inode. Similar to task local storage in tracing program, it is necessary to add recursion prevention logic for inode local storage. Patch 3/4 adds such logic, and 4/4 add a test for the recursion prevention logic. Changes v2 => v3: 1. Move bpf_inode_storage_free to i_callback(). (Martin) 2. Fix __bpf_inode_storage_get(). (Martin) Changes v1 => v2: 1. Rebase. 2. Fix send-email mistake. Song Liu (4): bpf: lsm: Remove hook to bpf_task_storage_free bpf: Make bpf inode storage available to tracing program bpf: Add recursion prevention logic for inode storage selftest/bpf: Test inode local storage recursion prevention fs/inode.c | 2 + include/linux/bpf.h | 9 + include/linux/bpf_lsm.h | 29 --- include/linux/fs.h | 4 + kernel/bpf/Makefile | 3 +- kernel/bpf/bpf_inode_storage.c | 185 +++++++++++++----- kernel/bpf/bpf_lsm.c | 4 - kernel/trace/bpf_trace.c | 8 + security/bpf/hooks.c | 7 - tools/testing/selftests/bpf/DENYLIST.s390x | 1 + .../bpf/prog_tests/inode_local_storage.c | 72 +++++++ .../bpf/progs/inode_storage_recursion.c | 90 +++++++++ 12 files changed, 321 insertions(+), 93 deletions(-) create mode 100644 tools/testing/selftests/bpf/prog_tests/inode_local_storage.c create mode 100644 tools/testing/selftests/bpf/progs/inode_storage_recursion.c -- 2.43.5
