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| author | Mykyta Yatsenko <yatsenko@meta.com> | 2025-10-26 20:38:49 +0000 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2025-10-27 09:56:27 -0700 |
| commit | 8d8771dc03e48300e80b43744dd3c320ccaf746a (patch) | |
| tree | 328ebc012266e326ba306eb0be46027ca66c1c47 /kernel/bpf/helpers.c | |
| parent | 9cba966f1c551cb7ebf4b66a5f0df660392c74d6 (diff) | |
| download | linux-next-8d8771dc03e48300e80b43744dd3c320ccaf746a.tar.gz linux-next-8d8771dc03e48300e80b43744dd3c320ccaf746a.zip | |
bpf: add plumbing for file-backed dynptr
Add the necessary verifier plumbing for the new file-backed dynptr type.
Introduce two kfuncs for its lifecycle management:
* bpf_dynptr_from_file() for initialization
* bpf_dynptr_file_discard() for destruction
Currently there is no mechanism for kfunc to release dynptr, this patch
add one:
* Dynptr release function sets meta->release_regno
* Call unmark_stack_slots_dynptr() if meta->release_regno is set and
dynptr ref_obj_id is set as well.
Signed-off-by: Mykyta Yatsenko <yatsenko@meta.com>
Acked-by: Eduard Zingerman <eddyz87@gmail.com>
Link: https://lore.kernel.org/r/20251026203853.135105-7-mykyta.yatsenko5@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'kernel/bpf/helpers.c')
| -rw-r--r-- | kernel/bpf/helpers.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/kernel/bpf/helpers.c b/kernel/bpf/helpers.c index a2ce17ea5edb..bf65b7fb761f 100644 --- a/kernel/bpf/helpers.c +++ b/kernel/bpf/helpers.c @@ -4252,6 +4252,16 @@ __bpf_kfunc int bpf_task_work_schedule_resume(struct task_struct *task, struct b return bpf_task_work_schedule(task, tw, map__map, callback, aux__prog, TWA_RESUME); } +__bpf_kfunc int bpf_dynptr_from_file(struct file *file, u32 flags, struct bpf_dynptr *ptr__uninit) +{ + return 0; +} + +__bpf_kfunc int bpf_dynptr_file_discard(struct bpf_dynptr *dynptr) +{ + return 0; +} + __bpf_kfunc_end_defs(); static void bpf_task_work_cancel_scheduled(struct irq_work *irq_work) @@ -4429,6 +4439,8 @@ BTF_ID_FLAGS(func, bpf_cgroup_read_xattr, KF_RCU) BTF_ID_FLAGS(func, bpf_stream_vprintk, KF_TRUSTED_ARGS) BTF_ID_FLAGS(func, bpf_task_work_schedule_signal, KF_TRUSTED_ARGS) BTF_ID_FLAGS(func, bpf_task_work_schedule_resume, KF_TRUSTED_ARGS) +BTF_ID_FLAGS(func, bpf_dynptr_from_file, KF_TRUSTED_ARGS) +BTF_ID_FLAGS(func, bpf_dynptr_file_discard) BTF_KFUNCS_END(common_btf_ids) static const struct btf_kfunc_id_set common_kfunc_set = { |