The verifier currently keeps a hard-coded list of kfuncs that may be
called while holding a bpf_spin_lock. With KF_SPINLOCK_SAFE available,
retaining this list creates two sources of truth and requires verifier
changes whenever another lock-safe kfunc is added.
Mark every kfunc currently accepted by kfunc_spin_allowed() with
KF_SPINLOCK_SAFE. This covers the graph, numeric iterator, resource
spin lock, arena, and stream kfuncs.
Remove the obsolete category checks and make kfunc_spin_allowed() rely
solely on the kfunc registration metadata. This preserves the behavior
of existing kfuncs while using the same mechanism for built-in and
module kfuncs.
Signed-off-by: Kaitao Cheng <chengkaitao@kylinos.cn>
Acked-by: Leon Hwang <leon.hwang@linux.dev>
Link: https://lore.kernel.org/bpf/20260805153340.34776-3-kaitao.cheng@linux.dev
Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
7619a0ee93