linux-kernel - Re: [PATCH bpf-next v4 1/6] bpf: Introduce pseudo_btf

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Date:   Tue, 6 Oct 2020 13:17:12 -0700
From:   Hao Luo <haoluo@...gle.com>
To:     Alexei Starovoitov <alexei.starovoitov@...il.com>
Cc:     Network Development <netdev@...r.kernel.org>,
        bpf <bpf@...r.kernel.org>, LKML <linux-kernel@...r.kernel.org>,
        "open list:KERNEL SELFTEST FRAMEWORK" 
        <linux-kselftest@...r.kernel.org>, Shuah Khan <shuah@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Andrii Nakryiko <andriin@...com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...omium.org>,
        Quentin Monnet <quentin@...valent.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...hat.com>
Subject: Re: [PATCH bpf-next v4 1/6] bpf: Introduce pseudo_btf_id

Ack. Will do.

On Tue, Oct 6, 2020 at 12:05 PM Alexei Starovoitov
<alexei.starovoitov@...il.com> wrote:
>
> On Tue, Sep 29, 2020 at 4:50 PM Hao Luo <haoluo@...gle.com> wrote:
> >
> > -       ret = replace_map_fd_with_map_ptr(env);
> > -       if (ret < 0)
> > -               goto skip_full_check;
> > -
> >         if (bpf_prog_is_dev_bound(env->prog->aux)) {
> >                 ret = bpf_prog_offload_verifier_prep(env->prog);
> >                 if (ret)
> > @@ -11662,6 +11757,10 @@ int bpf_check(struct bpf_prog **prog, union bpf_attr *attr,
> >         if (ret)
> >                 goto skip_full_check;
> >
> > +       ret = resolve_pseudo_ldimm64(env);
> > +       if (ret < 0)
> > +               goto skip_full_check;
> > +
>
> Hao,
>
> this change broke several tests in test_verifier:
> #21/u empty prog FAIL
> Unexpected error message!
>     EXP: unknown opcode 00
>     RES: last insn is not an exit or jmp
>
> #656/u test5 ld_imm64 FAIL
> Unexpected error message!
>     EXP: invalid bpf_ld_imm64 insn
>     RES: last insn is not an exit or jmp
>
> #656/p test5 ld_imm64 FAIL
> Unexpected error message!
>     EXP: invalid bpf_ld_imm64 insn
>     RES: last insn is not an exit or jmp
>
> Please send a fix.
> Thanks