[PATCH bpf-next] bpf: add a verbose message if map limit is reached

[Anton Protopopov <aspsk@xxxxxxxxxxxxx>]

When more than 64 maps are used by a program the verifier return -E2BIG.
Add a verbose message which highlights the error and also prints the
actual limit.

Signed-off-by: Anton Protopopov <aspsk@xxxxxxxxxxxxx>
---
 kernel/bpf/verifier.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
index 58952f040761..fa73009d05bc 100644
--- a/kernel/bpf/verifier.c
+++ b/kernel/bpf/verifier.c
@@ -18348,6 +18348,8 @@ static int resolve_pseudo_ldimm64(struct bpf_verifier_env *env)
 			}
 
 			if (env->used_map_cnt >= MAX_USED_MAPS) {
+				verbose(env, "The map usage limit of %u is reached\n",
+					MAX_USED_MAPS);
 				fdput(f);
 				return -E2BIG;
 			}
-- 
2.34.1