[bpf-next,v2,0/3] allow cpumask kfuncs in tracepoint, kprobe, perf event

Message

JP Kobryn Aug. 26, 2024, 10:48 p.m. UTC

It is possible to call a cpumask kfunc within a raw tp_btf program but not
possible within tracepoint, kprobe, or perf event programs. Currently, the
verifier receives -EACCESS from fetch_kfunc_meta() as a result of not
finding any kfunc hook associated with these program types.

This patch series adds new kfunc hooks and maps them to program types
where needed. The additional registration of the three program types
mentioned is done for the cpumask kfuncs allowing them to be called within
these types of programs.

Pre-submission CI run: https://github.com/kernel-patches/bpf/pull/7600

v2:
	- create new kfunc hooks for tracepoint and perf event
	- map tracepoint, and perf event prog types to kfunc hooks
	- register cpumask kfuncs with prog types in focus
	- expand existing verifier tests for cpumask kfuncs
v1:
	- map tracepoint type progs to tracing kfunc hook
	- new selftests for calling cpumask kfuncs in tracepoint prog
---
JP Kobryn (3):
  bpf: new btf kfunc hooks for tracepoint and perf event
  bpf: register additional prog types with cpumask kfuncs
  bpf/selftests: coverage for new program types using cpumask kfuncs

 kernel/bpf/btf.c                              |  6 +++++
 kernel/bpf/cpumask.c                          |  3 +++
 .../bpf/progs/verifier_kfunc_prog_types.c     | 24 +++++++++++++++++++
 3 files changed, 33 insertions(+)