linux-kernel - "bpf: Improve the info.func_info and info.func_info_rec

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Message-Id: <20190103114613.GB3957@osiris>
Date:   Thu, 3 Jan 2019 12:46:13 +0100
From:   Heiko Carstens <heiko.carstens@...ibm.com>
To:     Martin KaFai Lau <kafai@...com>,
        Eugene Syromyatnikov <evgsyr@...il.com>
Cc:     linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        Yonghong Song <yhs@...com>,
        Alexei Starovoitov <ast@...nel.org>,
        "Dmitry V. Levin" <ldv@...linux.org>
Subject: "bpf: Improve the info.func_info and info.func_info_rec_size
 behavior" breaks strace self tests

Hello,

the kernel commit 7337224fc150 ("bpf: Improve the info.func_info and
info.func_info_rec_size behavior") breaks one of strace's self tests:

FAIL: bpf-obj_get_info_by_fd-prog-v.gen

Looking into the kernel commit, it seems that the user space visible
uapi change is intentional; even though it might break existing user
space.

To reproduce:

git clone https://gitlab.com/strace/strace.git
cd strace
./bootstrap
./configure
make -j $(nproc)
cd tests
make -j $(nproc) check