linux-kernel - [PATCH bpf 0/2] Use __aligned

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Date:   Sun, 27 May 2018 13:28:35 +0200
From:   Eugene Syromiatnikov <esyr@...hat.com>
To:     netdev@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, Martin KaFai Lau <kafai@...com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Alexei Starovoitov <ast@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jiri Olsa <jolsa@...nel.org>, Ingo Molnar <mingo@...nel.org>,
        Lawrence Brakmo <brakmo@...com>, Andrey Ignatov <rdna@...com>,
        Jakub Kicinski <jakub.kicinski@...ronome.com>,
        John Fastabend <john.fastabend@...il.com>,
        "Dmitry V. Levin" <ldv@...linux.org>
Subject: [PATCH bpf 0/2] Use __aligned_u64 in UAPI fields

Hello.

It was discovered during strace development that struct bpf_map_info and
struct bpf_prog_info now have different layouts of i386/compat and x86_64.
Since it's already broken and bpf syscall has no separate compat (as
far as I can see), and the affecting change was introduced recently (in
Linux 4.16), it's proposed to change the layout of these structures
on 32-bit architectures by using __aligned_u64.

In order to somewhat future-proof from this problem in future, an
approach similar to the one implemented in RDMA subsystem recently
is proposed: use __aligned_u64 consistently throughout the UAPI header.

Eugene Syromiatnikov (2):
  bpf: fix alignment of netns_dev/netns_ino fields in
    bpf_{map,prog}_info
  bpf: enforce usage of __aligned_u64 in the UAPI header

 include/uapi/linux/bpf.h       | 30 +++++++++++++++---------------
 tools/include/uapi/linux/bpf.h | 30 +++++++++++++++---------------
 2 files changed, 30 insertions(+), 30 deletions(-)

-- 
2.1.4