netdev - Re: [PATCH v2 0/3] bpf: switch to new usercopy helpers

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Date:   Tue, 15 Oct 2019 19:14:42 -0700
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Christian Brauner <christian.brauner@...ntu.com>
Cc:     Alexei Starovoitov <ast@...nel.org>, bpf <bpf@...r.kernel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Martin KaFai Lau <kafai@...com>,
        LKML <linux-kernel@...r.kernel.org>,
        Network Development <netdev@...r.kernel.org>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>
Subject: Re: [PATCH v2 0/3] bpf: switch to new usercopy helpers

On Tue, Oct 15, 2019 at 5:41 PM Christian Brauner
<christian.brauner@...ntu.com> wrote:
>
> Hey everyone,
>
> In v5.4-rc2 we added two new helpers check_zeroed_user() and
> copy_struct_from_user() including selftests (cf. [1]). It is a generic
> interface designed to copy a struct from userspace. The helpers will be
> especially useful for structs versioned by size of which we have quite a
> few.

Was it tested?
Either your conversion is incorrect or that generic helper is broken.
./test_progs -n 2
and
./test_btf
are catching the bug:
BTF prog info raw test[8] (line_info (No subprog. zero tailing
line_info): do_test_info_raw:6205:FAIL prog_fd:-1
expected_prog_load_failure:0 errno:7
nonzero tailing record in line_infoprocessed 0 insns (limit 1000000)
max_states_per_insn 0 total_states 0 peak_states 0 mark_read 0