netdev - Re: [PATCH bpf-next v4 02/21] bpf: allow loading of a bpf

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Date:   Sat, 9 May 2020 22:07:32 -0700
From:   Yonghong Song <yhs@...com>
To:     Alexei Starovoitov <alexei.starovoitov@...il.com>
CC:     Andrii Nakryiko <andriin@...com>, <bpf@...r.kernel.org>,
        Martin KaFai Lau <kafai@...com>, <netdev@...r.kernel.org>,
        Alexei Starovoitov <ast@...com>,
        Daniel Borkmann <daniel@...earbox.net>, <kernel-team@...com>
Subject: Re: [PATCH bpf-next v4 02/21] bpf: allow loading of a bpf_iter
 program



On 5/9/20 5:41 PM, Alexei Starovoitov wrote:
> On Sat, May 09, 2020 at 10:59:00AM -0700, Yonghong Song wrote:
>> diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
>> index 70ad009577f8..d725ff7d11db 100644
>> --- a/kernel/bpf/verifier.c
>> +++ b/kernel/bpf/verifier.c
>> @@ -7101,6 +7101,10 @@ static int check_return_code(struct bpf_verifier_env *env)
>>   			return 0;
>>   		range = tnum_const(0);
>>   		break;
>> +	case BPF_PROG_TYPE_TRACING:
>> +		if (env->prog->expected_attach_type != BPF_TRACE_ITER)
>> +			return 0;
>> +		break;
> 
> Not related to this set, but I just noticed that I managed to forget to
> add this check for fentry/fexit/freplace.
> While it's not too late let's enforce return 0 for them ?
> Could you follow up with a patch for bpf tree?

Sure. I can have a followup patch for this.