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bpf: Allow BPF stream kfuncs while holding a lock

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The BPF stream kfuncs bpf_stream_vprintk and bpf_stream_print_stack
do not sleep and so are safe to call while holding a lock. Amend
the verifier to allow that.

Signed-off-by: Emil Tsalapatis <emil@etsalapatis.com>
Acked-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Link: https://lore.kernel.org/r/20260203180424.14057-4-emil@etsalapatis.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Emil Tsalapatis 2026-02-03 13:04:23 -05:00 committed by Alexei Starovoitov
parent 954fa97e21
commit 9ddfa24e16
1 changed files with 12 additions and 1 deletions
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13
kernel/bpf/verifier.c
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@ -12455,6 +12455,8 @@ enum special_kfunc_type {
KF_bpf_arena_free_pages,
KF_bpf_arena_reserve_pages,
KF_bpf_session_is_return,
KF_bpf_stream_vprintk,
KF_bpf_stream_print_stack,
};
BTF_ID_LIST(special_kfunc_list)
@ -12533,6 +12535,8 @@ BTF_ID(func, bpf_arena_alloc_pages)
BTF_ID(func, bpf_arena_free_pages)
BTF_ID(func, bpf_arena_reserve_pages)
BTF_ID(func, bpf_session_is_return)
BTF_ID(func, bpf_stream_vprintk)
BTF_ID(func, bpf_stream_print_stack)
static bool is_task_work_add_kfunc(u32 func_id)
{
@ -12977,10 +12981,17 @@ static bool is_bpf_arena_kfunc(u32 btf_id)
btf_id == special_kfunc_list[KF_bpf_arena_reserve_pages];
}
static bool is_bpf_stream_kfunc(u32 btf_id)
{
return btf_id == special_kfunc_list[KF_bpf_stream_vprintk] ||
btf_id == special_kfunc_list[KF_bpf_stream_print_stack];
}
static bool kfunc_spin_allowed(u32 btf_id)
{
return is_bpf_graph_api_kfunc(btf_id) || is_bpf_iter_num_api_kfunc(btf_id) ||
is_bpf_res_spin_lock_kfunc(btf_id) || is_bpf_arena_kfunc(btf_id);
is_bpf_res_spin_lock_kfunc(btf_id) || is_bpf_arena_kfunc(btf_id) ||
is_bpf_stream_kfunc(btf_id);
}
static bool is_sync_callback_calling_kfunc(u32 btf_id)