[PATCH bpf-next v2 1/2] bpf: copy BPF token from main program to subprograms

[Eduard Zingerman <eddyz87@gmail.com>]

bpf_jit_subprogs() copies various fields from the main program's aux to
each subprogram's aux, but omits the BPF token. This causes
bpf_prog_kallsyms_add() to fail for subprograms loaded via BPF token,
as bpf_token_capable() falls back to capable() in init_user_ns when
token is NULL.

Copy prog->aux->token to func[i]->aux->token so that subprograms
inherit the same capability delegation as the main program.

Fixes: d79a35497547 ("bpf: Consistently use BPF token throughout BPF verifier logic")
Signed-off-by: Tao Chen <ctao@meta.com>
Signed-off-by: Eduard Zingerman <eddyz87@gmail.com>
---
 kernel/bpf/fixups.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/kernel/bpf/fixups.c b/kernel/bpf/fixups.c
index 67c9b28767e1..dd00a680e4ea 100644
--- a/kernel/bpf/fixups.c
+++ b/kernel/bpf/fixups.c
@@ -1110,6 +1110,7 @@ int bpf_jit_subprogs(struct bpf_verifier_env *env)
 		func[i]->aux->exception_cb = env->subprog_info[i].is_exception_cb;
 		func[i]->aux->changes_pkt_data = env->subprog_info[i].changes_pkt_data;
 		func[i]->aux->might_sleep = env->subprog_info[i].might_sleep;
+		func[i]->aux->token = prog->aux->token;
 		if (!i)
 			func[i]->aux->exception_boundary = env->seen_exception;
 

-- 
2.53.0