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

Message ID 20240329072050.68289-1-aspsk@isovalent.com (mailing list archive)
State Superseded
Delegated to: BPF
Headers show
Series [bpf-next] bpf: add a verbose message if map limit is reached | expand

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Commit Message

Anton Protopopov March 29, 2024, 7:20 a.m. UTC 
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@isovalent.com>
---
 kernel/bpf/verifier.c | 2 ++
 1 file changed, 2 insertions(+)

Comments

Yonghong Song March 29, 2024, 2:37 p.m. UTC | #1 
On 3/29/24 12:20 AM, Anton Protopopov wrote:
> 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@isovalent.com>

Acked-by: Yonghong Song <yonghong.song@linux.dev>
Alexei Starovoitov March 29, 2024, 4:18 p.m. UTC | #2 
On Fri, Mar 29, 2024 at 12:18 AM Anton Protopopov <aspsk@isovalent.com> wrote:
>
> 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@isovalent.com>
> ---
>  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);

"map usage limit" reads as "number of times the map was used".

Please make it clear that it's the total number of maps
used by a program and its subprograms.

pw-bot: cr
diff mbox series

Patch

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;
 			}